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36f7f1303f
invalid when trying to create temporary copy of the invalid initializer. rdar://19109967 llvm-svn: 227378
7305 lines
283 KiB
C++
7305 lines
283 KiB
C++
//===--- SemaInit.cpp - Semantic Analysis for Initializers ----------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements semantic analysis for initializers.
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//
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//===----------------------------------------------------------------------===//
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#include "clang/Sema/Initialization.h"
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#include "clang/AST/ASTContext.h"
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#include "clang/AST/DeclObjC.h"
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#include "clang/AST/ExprCXX.h"
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#include "clang/AST/ExprObjC.h"
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#include "clang/AST/TypeLoc.h"
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#include "clang/Basic/TargetInfo.h"
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#include "clang/Sema/Designator.h"
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#include "clang/Sema/Lookup.h"
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#include "clang/Sema/SemaInternal.h"
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#include "llvm/ADT/APInt.h"
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#include "llvm/ADT/SmallString.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/raw_ostream.h"
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#include <map>
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using namespace clang;
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//===----------------------------------------------------------------------===//
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// Sema Initialization Checking
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//===----------------------------------------------------------------------===//
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/// \brief Check whether T is compatible with a wide character type (wchar_t,
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/// char16_t or char32_t).
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static bool IsWideCharCompatible(QualType T, ASTContext &Context) {
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if (Context.typesAreCompatible(Context.getWideCharType(), T))
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return true;
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if (Context.getLangOpts().CPlusPlus || Context.getLangOpts().C11) {
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return Context.typesAreCompatible(Context.Char16Ty, T) ||
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Context.typesAreCompatible(Context.Char32Ty, T);
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}
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return false;
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}
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enum StringInitFailureKind {
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SIF_None,
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SIF_NarrowStringIntoWideChar,
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SIF_WideStringIntoChar,
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SIF_IncompatWideStringIntoWideChar,
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SIF_Other
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};
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/// \brief Check whether the array of type AT can be initialized by the Init
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/// expression by means of string initialization. Returns SIF_None if so,
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/// otherwise returns a StringInitFailureKind that describes why the
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/// initialization would not work.
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static StringInitFailureKind IsStringInit(Expr *Init, const ArrayType *AT,
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ASTContext &Context) {
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if (!isa<ConstantArrayType>(AT) && !isa<IncompleteArrayType>(AT))
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return SIF_Other;
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// See if this is a string literal or @encode.
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Init = Init->IgnoreParens();
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// Handle @encode, which is a narrow string.
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if (isa<ObjCEncodeExpr>(Init) && AT->getElementType()->isCharType())
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return SIF_None;
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// Otherwise we can only handle string literals.
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StringLiteral *SL = dyn_cast<StringLiteral>(Init);
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if (!SL)
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return SIF_Other;
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const QualType ElemTy =
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Context.getCanonicalType(AT->getElementType()).getUnqualifiedType();
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switch (SL->getKind()) {
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case StringLiteral::Ascii:
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case StringLiteral::UTF8:
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// char array can be initialized with a narrow string.
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// Only allow char x[] = "foo"; not char x[] = L"foo";
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if (ElemTy->isCharType())
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return SIF_None;
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if (IsWideCharCompatible(ElemTy, Context))
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return SIF_NarrowStringIntoWideChar;
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return SIF_Other;
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// C99 6.7.8p15 (with correction from DR343), or C11 6.7.9p15:
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// "An array with element type compatible with a qualified or unqualified
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// version of wchar_t, char16_t, or char32_t may be initialized by a wide
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// string literal with the corresponding encoding prefix (L, u, or U,
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// respectively), optionally enclosed in braces.
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case StringLiteral::UTF16:
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if (Context.typesAreCompatible(Context.Char16Ty, ElemTy))
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return SIF_None;
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if (ElemTy->isCharType())
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return SIF_WideStringIntoChar;
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if (IsWideCharCompatible(ElemTy, Context))
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return SIF_IncompatWideStringIntoWideChar;
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return SIF_Other;
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case StringLiteral::UTF32:
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if (Context.typesAreCompatible(Context.Char32Ty, ElemTy))
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return SIF_None;
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if (ElemTy->isCharType())
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return SIF_WideStringIntoChar;
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if (IsWideCharCompatible(ElemTy, Context))
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return SIF_IncompatWideStringIntoWideChar;
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return SIF_Other;
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case StringLiteral::Wide:
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if (Context.typesAreCompatible(Context.getWideCharType(), ElemTy))
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return SIF_None;
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if (ElemTy->isCharType())
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return SIF_WideStringIntoChar;
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if (IsWideCharCompatible(ElemTy, Context))
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return SIF_IncompatWideStringIntoWideChar;
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return SIF_Other;
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}
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llvm_unreachable("missed a StringLiteral kind?");
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}
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static StringInitFailureKind IsStringInit(Expr *init, QualType declType,
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ASTContext &Context) {
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const ArrayType *arrayType = Context.getAsArrayType(declType);
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if (!arrayType)
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return SIF_Other;
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return IsStringInit(init, arrayType, Context);
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}
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/// Update the type of a string literal, including any surrounding parentheses,
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/// to match the type of the object which it is initializing.
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static void updateStringLiteralType(Expr *E, QualType Ty) {
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while (true) {
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E->setType(Ty);
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if (isa<StringLiteral>(E) || isa<ObjCEncodeExpr>(E))
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break;
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else if (ParenExpr *PE = dyn_cast<ParenExpr>(E))
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E = PE->getSubExpr();
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else if (UnaryOperator *UO = dyn_cast<UnaryOperator>(E))
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E = UO->getSubExpr();
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else if (GenericSelectionExpr *GSE = dyn_cast<GenericSelectionExpr>(E))
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E = GSE->getResultExpr();
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else
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llvm_unreachable("unexpected expr in string literal init");
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}
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}
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static void CheckStringInit(Expr *Str, QualType &DeclT, const ArrayType *AT,
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Sema &S) {
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// Get the length of the string as parsed.
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auto *ConstantArrayTy =
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cast<ConstantArrayType>(Str->getType()->getAsArrayTypeUnsafe());
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uint64_t StrLength = ConstantArrayTy->getSize().getZExtValue();
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if (const IncompleteArrayType *IAT = dyn_cast<IncompleteArrayType>(AT)) {
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// C99 6.7.8p14. We have an array of character type with unknown size
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// being initialized to a string literal.
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llvm::APInt ConstVal(32, StrLength);
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// Return a new array type (C99 6.7.8p22).
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DeclT = S.Context.getConstantArrayType(IAT->getElementType(),
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ConstVal,
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ArrayType::Normal, 0);
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updateStringLiteralType(Str, DeclT);
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return;
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}
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const ConstantArrayType *CAT = cast<ConstantArrayType>(AT);
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// We have an array of character type with known size. However,
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// the size may be smaller or larger than the string we are initializing.
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// FIXME: Avoid truncation for 64-bit length strings.
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if (S.getLangOpts().CPlusPlus) {
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if (StringLiteral *SL = dyn_cast<StringLiteral>(Str->IgnoreParens())) {
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// For Pascal strings it's OK to strip off the terminating null character,
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// so the example below is valid:
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//
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// unsigned char a[2] = "\pa";
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if (SL->isPascal())
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StrLength--;
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}
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// [dcl.init.string]p2
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if (StrLength > CAT->getSize().getZExtValue())
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S.Diag(Str->getLocStart(),
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diag::err_initializer_string_for_char_array_too_long)
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<< Str->getSourceRange();
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} else {
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// C99 6.7.8p14.
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if (StrLength-1 > CAT->getSize().getZExtValue())
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S.Diag(Str->getLocStart(),
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diag::ext_initializer_string_for_char_array_too_long)
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<< Str->getSourceRange();
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}
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// Set the type to the actual size that we are initializing. If we have
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// something like:
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// char x[1] = "foo";
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// then this will set the string literal's type to char[1].
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updateStringLiteralType(Str, DeclT);
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}
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//===----------------------------------------------------------------------===//
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// Semantic checking for initializer lists.
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//===----------------------------------------------------------------------===//
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/// @brief Semantic checking for initializer lists.
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///
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/// The InitListChecker class contains a set of routines that each
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/// handle the initialization of a certain kind of entity, e.g.,
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/// arrays, vectors, struct/union types, scalars, etc. The
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/// InitListChecker itself performs a recursive walk of the subobject
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/// structure of the type to be initialized, while stepping through
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/// the initializer list one element at a time. The IList and Index
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/// parameters to each of the Check* routines contain the active
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/// (syntactic) initializer list and the index into that initializer
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/// list that represents the current initializer. Each routine is
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/// responsible for moving that Index forward as it consumes elements.
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///
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/// Each Check* routine also has a StructuredList/StructuredIndex
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/// arguments, which contains the current "structured" (semantic)
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/// initializer list and the index into that initializer list where we
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/// are copying initializers as we map them over to the semantic
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/// list. Once we have completed our recursive walk of the subobject
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/// structure, we will have constructed a full semantic initializer
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/// list.
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///
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/// C99 designators cause changes in the initializer list traversal,
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/// because they make the initialization "jump" into a specific
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/// subobject and then continue the initialization from that
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/// point. CheckDesignatedInitializer() recursively steps into the
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/// designated subobject and manages backing out the recursion to
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/// initialize the subobjects after the one designated.
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namespace {
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class InitListChecker {
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Sema &SemaRef;
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bool hadError;
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bool VerifyOnly; // no diagnostics, no structure building
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llvm::DenseMap<InitListExpr *, InitListExpr *> SyntacticToSemantic;
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InitListExpr *FullyStructuredList;
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void CheckImplicitInitList(const InitializedEntity &Entity,
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InitListExpr *ParentIList, QualType T,
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unsigned &Index, InitListExpr *StructuredList,
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unsigned &StructuredIndex);
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void CheckExplicitInitList(const InitializedEntity &Entity,
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InitListExpr *IList, QualType &T,
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InitListExpr *StructuredList,
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bool TopLevelObject = false);
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void CheckListElementTypes(const InitializedEntity &Entity,
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InitListExpr *IList, QualType &DeclType,
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bool SubobjectIsDesignatorContext,
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unsigned &Index,
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InitListExpr *StructuredList,
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unsigned &StructuredIndex,
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bool TopLevelObject = false);
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void CheckSubElementType(const InitializedEntity &Entity,
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InitListExpr *IList, QualType ElemType,
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unsigned &Index,
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InitListExpr *StructuredList,
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unsigned &StructuredIndex);
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void CheckComplexType(const InitializedEntity &Entity,
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InitListExpr *IList, QualType DeclType,
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unsigned &Index,
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InitListExpr *StructuredList,
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unsigned &StructuredIndex);
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void CheckScalarType(const InitializedEntity &Entity,
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InitListExpr *IList, QualType DeclType,
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unsigned &Index,
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InitListExpr *StructuredList,
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unsigned &StructuredIndex);
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void CheckReferenceType(const InitializedEntity &Entity,
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InitListExpr *IList, QualType DeclType,
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unsigned &Index,
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InitListExpr *StructuredList,
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unsigned &StructuredIndex);
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void CheckVectorType(const InitializedEntity &Entity,
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InitListExpr *IList, QualType DeclType, unsigned &Index,
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InitListExpr *StructuredList,
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unsigned &StructuredIndex);
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void CheckStructUnionTypes(const InitializedEntity &Entity,
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InitListExpr *IList, QualType DeclType,
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RecordDecl::field_iterator Field,
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bool SubobjectIsDesignatorContext, unsigned &Index,
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InitListExpr *StructuredList,
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unsigned &StructuredIndex,
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bool TopLevelObject = false);
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void CheckArrayType(const InitializedEntity &Entity,
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InitListExpr *IList, QualType &DeclType,
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llvm::APSInt elementIndex,
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bool SubobjectIsDesignatorContext, unsigned &Index,
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InitListExpr *StructuredList,
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unsigned &StructuredIndex);
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bool CheckDesignatedInitializer(const InitializedEntity &Entity,
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InitListExpr *IList, DesignatedInitExpr *DIE,
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unsigned DesigIdx,
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QualType &CurrentObjectType,
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RecordDecl::field_iterator *NextField,
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llvm::APSInt *NextElementIndex,
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unsigned &Index,
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InitListExpr *StructuredList,
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unsigned &StructuredIndex,
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bool FinishSubobjectInit,
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bool TopLevelObject);
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InitListExpr *getStructuredSubobjectInit(InitListExpr *IList, unsigned Index,
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QualType CurrentObjectType,
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InitListExpr *StructuredList,
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unsigned StructuredIndex,
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SourceRange InitRange);
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void UpdateStructuredListElement(InitListExpr *StructuredList,
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unsigned &StructuredIndex,
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Expr *expr);
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int numArrayElements(QualType DeclType);
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int numStructUnionElements(QualType DeclType);
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static ExprResult PerformEmptyInit(Sema &SemaRef,
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SourceLocation Loc,
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const InitializedEntity &Entity,
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bool VerifyOnly);
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void FillInEmptyInitForField(unsigned Init, FieldDecl *Field,
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const InitializedEntity &ParentEntity,
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InitListExpr *ILE, bool &RequiresSecondPass);
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void FillInEmptyInitializations(const InitializedEntity &Entity,
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InitListExpr *ILE, bool &RequiresSecondPass);
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bool CheckFlexibleArrayInit(const InitializedEntity &Entity,
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Expr *InitExpr, FieldDecl *Field,
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bool TopLevelObject);
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void CheckEmptyInitializable(const InitializedEntity &Entity,
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SourceLocation Loc);
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public:
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InitListChecker(Sema &S, const InitializedEntity &Entity,
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InitListExpr *IL, QualType &T, bool VerifyOnly);
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bool HadError() { return hadError; }
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// @brief Retrieves the fully-structured initializer list used for
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// semantic analysis and code generation.
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InitListExpr *getFullyStructuredList() const { return FullyStructuredList; }
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};
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} // end anonymous namespace
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ExprResult InitListChecker::PerformEmptyInit(Sema &SemaRef,
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SourceLocation Loc,
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const InitializedEntity &Entity,
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bool VerifyOnly) {
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InitializationKind Kind = InitializationKind::CreateValue(Loc, Loc, Loc,
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true);
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MultiExprArg SubInit;
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Expr *InitExpr;
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InitListExpr DummyInitList(SemaRef.Context, Loc, None, Loc);
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// C++ [dcl.init.aggr]p7:
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// If there are fewer initializer-clauses in the list than there are
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// members in the aggregate, then each member not explicitly initialized
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// ...
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bool EmptyInitList = SemaRef.getLangOpts().CPlusPlus11 &&
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Entity.getType()->getBaseElementTypeUnsafe()->isRecordType();
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if (EmptyInitList) {
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// C++1y / DR1070:
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// shall be initialized [...] from an empty initializer list.
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//
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// We apply the resolution of this DR to C++11 but not C++98, since C++98
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// does not have useful semantics for initialization from an init list.
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// We treat this as copy-initialization, because aggregate initialization
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// always performs copy-initialization on its elements.
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//
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// Only do this if we're initializing a class type, to avoid filling in
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// the initializer list where possible.
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InitExpr = VerifyOnly ? &DummyInitList : new (SemaRef.Context)
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InitListExpr(SemaRef.Context, Loc, None, Loc);
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InitExpr->setType(SemaRef.Context.VoidTy);
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SubInit = InitExpr;
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Kind = InitializationKind::CreateCopy(Loc, Loc);
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} else {
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// C++03:
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// shall be value-initialized.
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}
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InitializationSequence InitSeq(SemaRef, Entity, Kind, SubInit);
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// libstdc++4.6 marks the vector default constructor as explicit in
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// _GLIBCXX_DEBUG mode, so recover using the C++03 logic in that case.
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// stlport does so too. Look for std::__debug for libstdc++, and for
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// std:: for stlport. This is effectively a compiler-side implementation of
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// LWG2193.
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if (!InitSeq && EmptyInitList && InitSeq.getFailureKind() ==
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InitializationSequence::FK_ExplicitConstructor) {
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OverloadCandidateSet::iterator Best;
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OverloadingResult O =
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InitSeq.getFailedCandidateSet()
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.BestViableFunction(SemaRef, Kind.getLocation(), Best);
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(void)O;
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assert(O == OR_Success && "Inconsistent overload resolution");
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CXXConstructorDecl *CtorDecl = cast<CXXConstructorDecl>(Best->Function);
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CXXRecordDecl *R = CtorDecl->getParent();
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if (CtorDecl->getMinRequiredArguments() == 0 &&
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CtorDecl->isExplicit() && R->getDeclName() &&
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SemaRef.SourceMgr.isInSystemHeader(CtorDecl->getLocation())) {
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bool IsInStd = false;
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for (NamespaceDecl *ND = dyn_cast<NamespaceDecl>(R->getDeclContext());
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ND && !IsInStd; ND = dyn_cast<NamespaceDecl>(ND->getParent())) {
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if (SemaRef.getStdNamespace()->InEnclosingNamespaceSetOf(ND))
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IsInStd = true;
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}
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if (IsInStd && llvm::StringSwitch<bool>(R->getName())
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.Cases("basic_string", "deque", "forward_list", true)
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.Cases("list", "map", "multimap", "multiset", true)
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.Cases("priority_queue", "queue", "set", "stack", true)
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.Cases("unordered_map", "unordered_set", "vector", true)
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.Default(false)) {
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InitSeq.InitializeFrom(
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SemaRef, Entity,
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InitializationKind::CreateValue(Loc, Loc, Loc, true),
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MultiExprArg(), /*TopLevelOfInitList=*/false);
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// Emit a warning for this. System header warnings aren't shown
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// by default, but people working on system headers should see it.
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if (!VerifyOnly) {
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SemaRef.Diag(CtorDecl->getLocation(),
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diag::warn_invalid_initializer_from_system_header);
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SemaRef.Diag(Entity.getDecl()->getLocation(),
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diag::note_used_in_initialization_here);
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}
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}
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}
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}
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if (!InitSeq) {
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if (!VerifyOnly) {
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InitSeq.Diagnose(SemaRef, Entity, Kind, SubInit);
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if (Entity.getKind() == InitializedEntity::EK_Member)
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SemaRef.Diag(Entity.getDecl()->getLocation(),
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diag::note_in_omitted_aggregate_initializer)
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<< /*field*/1 << Entity.getDecl();
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else if (Entity.getKind() == InitializedEntity::EK_ArrayElement)
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SemaRef.Diag(Loc, diag::note_in_omitted_aggregate_initializer)
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<< /*array element*/0 << Entity.getElementIndex();
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}
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return ExprError();
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}
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return VerifyOnly ? ExprResult(static_cast<Expr *>(nullptr))
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: InitSeq.Perform(SemaRef, Entity, Kind, SubInit);
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}
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void InitListChecker::CheckEmptyInitializable(const InitializedEntity &Entity,
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SourceLocation Loc) {
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assert(VerifyOnly &&
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"CheckEmptyInitializable is only inteded for verification mode.");
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if (PerformEmptyInit(SemaRef, Loc, Entity, /*VerifyOnly*/true).isInvalid())
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hadError = true;
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}
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void InitListChecker::FillInEmptyInitForField(unsigned Init, FieldDecl *Field,
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const InitializedEntity &ParentEntity,
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InitListExpr *ILE,
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bool &RequiresSecondPass) {
|
|
SourceLocation Loc = ILE->getLocEnd();
|
|
unsigned NumInits = ILE->getNumInits();
|
|
InitializedEntity MemberEntity
|
|
= InitializedEntity::InitializeMember(Field, &ParentEntity);
|
|
if (Init >= NumInits || !ILE->getInit(Init)) {
|
|
// C++1y [dcl.init.aggr]p7:
|
|
// If there are fewer initializer-clauses in the list than there are
|
|
// members in the aggregate, then each member not explicitly initialized
|
|
// shall be initialized from its brace-or-equal-initializer [...]
|
|
if (Field->hasInClassInitializer()) {
|
|
ExprResult DIE = SemaRef.BuildCXXDefaultInitExpr(Loc, Field);
|
|
if (DIE.isInvalid()) {
|
|
hadError = true;
|
|
return;
|
|
}
|
|
if (Init < NumInits)
|
|
ILE->setInit(Init, DIE.get());
|
|
else {
|
|
ILE->updateInit(SemaRef.Context, Init, DIE.get());
|
|
RequiresSecondPass = true;
|
|
}
|
|
return;
|
|
}
|
|
|
|
if (Field->getType()->isReferenceType()) {
|
|
// C++ [dcl.init.aggr]p9:
|
|
// If an incomplete or empty initializer-list leaves a
|
|
// member of reference type uninitialized, the program is
|
|
// ill-formed.
|
|
SemaRef.Diag(Loc, diag::err_init_reference_member_uninitialized)
|
|
<< Field->getType()
|
|
<< ILE->getSyntacticForm()->getSourceRange();
|
|
SemaRef.Diag(Field->getLocation(),
|
|
diag::note_uninit_reference_member);
|
|
hadError = true;
|
|
return;
|
|
}
|
|
|
|
ExprResult MemberInit = PerformEmptyInit(SemaRef, Loc, MemberEntity,
|
|
/*VerifyOnly*/false);
|
|
if (MemberInit.isInvalid()) {
|
|
hadError = true;
|
|
return;
|
|
}
|
|
|
|
if (hadError) {
|
|
// Do nothing
|
|
} else if (Init < NumInits) {
|
|
ILE->setInit(Init, MemberInit.getAs<Expr>());
|
|
} else if (!isa<ImplicitValueInitExpr>(MemberInit.get())) {
|
|
// Empty initialization requires a constructor call, so
|
|
// extend the initializer list to include the constructor
|
|
// call and make a note that we'll need to take another pass
|
|
// through the initializer list.
|
|
ILE->updateInit(SemaRef.Context, Init, MemberInit.getAs<Expr>());
|
|
RequiresSecondPass = true;
|
|
}
|
|
} else if (InitListExpr *InnerILE
|
|
= dyn_cast<InitListExpr>(ILE->getInit(Init)))
|
|
FillInEmptyInitializations(MemberEntity, InnerILE,
|
|
RequiresSecondPass);
|
|
}
|
|
|
|
/// Recursively replaces NULL values within the given initializer list
|
|
/// with expressions that perform value-initialization of the
|
|
/// appropriate type.
|
|
void
|
|
InitListChecker::FillInEmptyInitializations(const InitializedEntity &Entity,
|
|
InitListExpr *ILE,
|
|
bool &RequiresSecondPass) {
|
|
assert((ILE->getType() != SemaRef.Context.VoidTy) &&
|
|
"Should not have void type");
|
|
|
|
if (const RecordType *RType = ILE->getType()->getAs<RecordType>()) {
|
|
const RecordDecl *RDecl = RType->getDecl();
|
|
if (RDecl->isUnion() && ILE->getInitializedFieldInUnion())
|
|
FillInEmptyInitForField(0, ILE->getInitializedFieldInUnion(),
|
|
Entity, ILE, RequiresSecondPass);
|
|
else if (RDecl->isUnion() && isa<CXXRecordDecl>(RDecl) &&
|
|
cast<CXXRecordDecl>(RDecl)->hasInClassInitializer()) {
|
|
for (auto *Field : RDecl->fields()) {
|
|
if (Field->hasInClassInitializer()) {
|
|
FillInEmptyInitForField(0, Field, Entity, ILE, RequiresSecondPass);
|
|
break;
|
|
}
|
|
}
|
|
} else {
|
|
unsigned Init = 0;
|
|
for (auto *Field : RDecl->fields()) {
|
|
if (Field->isUnnamedBitfield())
|
|
continue;
|
|
|
|
if (hadError)
|
|
return;
|
|
|
|
FillInEmptyInitForField(Init, Field, Entity, ILE, RequiresSecondPass);
|
|
if (hadError)
|
|
return;
|
|
|
|
++Init;
|
|
|
|
// Only look at the first initialization of a union.
|
|
if (RDecl->isUnion())
|
|
break;
|
|
}
|
|
}
|
|
|
|
return;
|
|
}
|
|
|
|
QualType ElementType;
|
|
|
|
InitializedEntity ElementEntity = Entity;
|
|
unsigned NumInits = ILE->getNumInits();
|
|
unsigned NumElements = NumInits;
|
|
if (const ArrayType *AType = SemaRef.Context.getAsArrayType(ILE->getType())) {
|
|
ElementType = AType->getElementType();
|
|
if (const ConstantArrayType *CAType = dyn_cast<ConstantArrayType>(AType))
|
|
NumElements = CAType->getSize().getZExtValue();
|
|
ElementEntity = InitializedEntity::InitializeElement(SemaRef.Context,
|
|
0, Entity);
|
|
} else if (const VectorType *VType = ILE->getType()->getAs<VectorType>()) {
|
|
ElementType = VType->getElementType();
|
|
NumElements = VType->getNumElements();
|
|
ElementEntity = InitializedEntity::InitializeElement(SemaRef.Context,
|
|
0, Entity);
|
|
} else
|
|
ElementType = ILE->getType();
|
|
|
|
for (unsigned Init = 0; Init != NumElements; ++Init) {
|
|
if (hadError)
|
|
return;
|
|
|
|
if (ElementEntity.getKind() == InitializedEntity::EK_ArrayElement ||
|
|
ElementEntity.getKind() == InitializedEntity::EK_VectorElement)
|
|
ElementEntity.setElementIndex(Init);
|
|
|
|
Expr *InitExpr = (Init < NumInits ? ILE->getInit(Init) : nullptr);
|
|
if (!InitExpr && !ILE->hasArrayFiller()) {
|
|
ExprResult ElementInit = PerformEmptyInit(SemaRef, ILE->getLocEnd(),
|
|
ElementEntity,
|
|
/*VerifyOnly*/false);
|
|
if (ElementInit.isInvalid()) {
|
|
hadError = true;
|
|
return;
|
|
}
|
|
|
|
if (hadError) {
|
|
// Do nothing
|
|
} else if (Init < NumInits) {
|
|
// For arrays, just set the expression used for value-initialization
|
|
// of the "holes" in the array.
|
|
if (ElementEntity.getKind() == InitializedEntity::EK_ArrayElement)
|
|
ILE->setArrayFiller(ElementInit.getAs<Expr>());
|
|
else
|
|
ILE->setInit(Init, ElementInit.getAs<Expr>());
|
|
} else {
|
|
// For arrays, just set the expression used for value-initialization
|
|
// of the rest of elements and exit.
|
|
if (ElementEntity.getKind() == InitializedEntity::EK_ArrayElement) {
|
|
ILE->setArrayFiller(ElementInit.getAs<Expr>());
|
|
return;
|
|
}
|
|
|
|
if (!isa<ImplicitValueInitExpr>(ElementInit.get())) {
|
|
// Empty initialization requires a constructor call, so
|
|
// extend the initializer list to include the constructor
|
|
// call and make a note that we'll need to take another pass
|
|
// through the initializer list.
|
|
ILE->updateInit(SemaRef.Context, Init, ElementInit.getAs<Expr>());
|
|
RequiresSecondPass = true;
|
|
}
|
|
}
|
|
} else if (InitListExpr *InnerILE
|
|
= dyn_cast_or_null<InitListExpr>(InitExpr))
|
|
FillInEmptyInitializations(ElementEntity, InnerILE, RequiresSecondPass);
|
|
}
|
|
}
|
|
|
|
|
|
InitListChecker::InitListChecker(Sema &S, const InitializedEntity &Entity,
|
|
InitListExpr *IL, QualType &T,
|
|
bool VerifyOnly)
|
|
: SemaRef(S), VerifyOnly(VerifyOnly) {
|
|
hadError = false;
|
|
|
|
FullyStructuredList =
|
|
getStructuredSubobjectInit(IL, 0, T, nullptr, 0, IL->getSourceRange());
|
|
CheckExplicitInitList(Entity, IL, T, FullyStructuredList,
|
|
/*TopLevelObject=*/true);
|
|
|
|
if (!hadError && !VerifyOnly) {
|
|
bool RequiresSecondPass = false;
|
|
FillInEmptyInitializations(Entity, FullyStructuredList, RequiresSecondPass);
|
|
if (RequiresSecondPass && !hadError)
|
|
FillInEmptyInitializations(Entity, FullyStructuredList,
|
|
RequiresSecondPass);
|
|
}
|
|
}
|
|
|
|
int InitListChecker::numArrayElements(QualType DeclType) {
|
|
// FIXME: use a proper constant
|
|
int maxElements = 0x7FFFFFFF;
|
|
if (const ConstantArrayType *CAT =
|
|
SemaRef.Context.getAsConstantArrayType(DeclType)) {
|
|
maxElements = static_cast<int>(CAT->getSize().getZExtValue());
|
|
}
|
|
return maxElements;
|
|
}
|
|
|
|
int InitListChecker::numStructUnionElements(QualType DeclType) {
|
|
RecordDecl *structDecl = DeclType->getAs<RecordType>()->getDecl();
|
|
int InitializableMembers = 0;
|
|
for (const auto *Field : structDecl->fields())
|
|
if (!Field->isUnnamedBitfield())
|
|
++InitializableMembers;
|
|
|
|
if (structDecl->isUnion())
|
|
return std::min(InitializableMembers, 1);
|
|
return InitializableMembers - structDecl->hasFlexibleArrayMember();
|
|
}
|
|
|
|
/// Check whether the range of the initializer \p ParentIList from element
|
|
/// \p Index onwards can be used to initialize an object of type \p T. Update
|
|
/// \p Index to indicate how many elements of the list were consumed.
|
|
///
|
|
/// This also fills in \p StructuredList, from element \p StructuredIndex
|
|
/// onwards, with the fully-braced, desugared form of the initialization.
|
|
void InitListChecker::CheckImplicitInitList(const InitializedEntity &Entity,
|
|
InitListExpr *ParentIList,
|
|
QualType T, unsigned &Index,
|
|
InitListExpr *StructuredList,
|
|
unsigned &StructuredIndex) {
|
|
int maxElements = 0;
|
|
|
|
if (T->isArrayType())
|
|
maxElements = numArrayElements(T);
|
|
else if (T->isRecordType())
|
|
maxElements = numStructUnionElements(T);
|
|
else if (T->isVectorType())
|
|
maxElements = T->getAs<VectorType>()->getNumElements();
|
|
else
|
|
llvm_unreachable("CheckImplicitInitList(): Illegal type");
|
|
|
|
if (maxElements == 0) {
|
|
if (!VerifyOnly)
|
|
SemaRef.Diag(ParentIList->getInit(Index)->getLocStart(),
|
|
diag::err_implicit_empty_initializer);
|
|
++Index;
|
|
hadError = true;
|
|
return;
|
|
}
|
|
|
|
// Build a structured initializer list corresponding to this subobject.
|
|
InitListExpr *StructuredSubobjectInitList
|
|
= getStructuredSubobjectInit(ParentIList, Index, T, StructuredList,
|
|
StructuredIndex,
|
|
SourceRange(ParentIList->getInit(Index)->getLocStart(),
|
|
ParentIList->getSourceRange().getEnd()));
|
|
unsigned StructuredSubobjectInitIndex = 0;
|
|
|
|
// Check the element types and build the structural subobject.
|
|
unsigned StartIndex = Index;
|
|
CheckListElementTypes(Entity, ParentIList, T,
|
|
/*SubobjectIsDesignatorContext=*/false, Index,
|
|
StructuredSubobjectInitList,
|
|
StructuredSubobjectInitIndex);
|
|
|
|
if (!VerifyOnly) {
|
|
StructuredSubobjectInitList->setType(T);
|
|
|
|
unsigned EndIndex = (Index == StartIndex? StartIndex : Index - 1);
|
|
// Update the structured sub-object initializer so that it's ending
|
|
// range corresponds with the end of the last initializer it used.
|
|
if (EndIndex < ParentIList->getNumInits()) {
|
|
SourceLocation EndLoc
|
|
= ParentIList->getInit(EndIndex)->getSourceRange().getEnd();
|
|
StructuredSubobjectInitList->setRBraceLoc(EndLoc);
|
|
}
|
|
|
|
// Complain about missing braces.
|
|
if (T->isArrayType() || T->isRecordType()) {
|
|
SemaRef.Diag(StructuredSubobjectInitList->getLocStart(),
|
|
diag::warn_missing_braces)
|
|
<< StructuredSubobjectInitList->getSourceRange()
|
|
<< FixItHint::CreateInsertion(
|
|
StructuredSubobjectInitList->getLocStart(), "{")
|
|
<< FixItHint::CreateInsertion(
|
|
SemaRef.getLocForEndOfToken(
|
|
StructuredSubobjectInitList->getLocEnd()),
|
|
"}");
|
|
}
|
|
}
|
|
}
|
|
|
|
/// Check whether the initializer \p IList (that was written with explicit
|
|
/// braces) can be used to initialize an object of type \p T.
|
|
///
|
|
/// This also fills in \p StructuredList with the fully-braced, desugared
|
|
/// form of the initialization.
|
|
void InitListChecker::CheckExplicitInitList(const InitializedEntity &Entity,
|
|
InitListExpr *IList, QualType &T,
|
|
InitListExpr *StructuredList,
|
|
bool TopLevelObject) {
|
|
if (!VerifyOnly) {
|
|
SyntacticToSemantic[IList] = StructuredList;
|
|
StructuredList->setSyntacticForm(IList);
|
|
}
|
|
|
|
unsigned Index = 0, StructuredIndex = 0;
|
|
CheckListElementTypes(Entity, IList, T, /*SubobjectIsDesignatorContext=*/true,
|
|
Index, StructuredList, StructuredIndex, TopLevelObject);
|
|
if (!VerifyOnly) {
|
|
QualType ExprTy = T;
|
|
if (!ExprTy->isArrayType())
|
|
ExprTy = ExprTy.getNonLValueExprType(SemaRef.Context);
|
|
IList->setType(ExprTy);
|
|
StructuredList->setType(ExprTy);
|
|
}
|
|
if (hadError)
|
|
return;
|
|
|
|
if (Index < IList->getNumInits()) {
|
|
// We have leftover initializers
|
|
if (VerifyOnly) {
|
|
if (SemaRef.getLangOpts().CPlusPlus ||
|
|
(SemaRef.getLangOpts().OpenCL &&
|
|
IList->getType()->isVectorType())) {
|
|
hadError = true;
|
|
}
|
|
return;
|
|
}
|
|
|
|
if (StructuredIndex == 1 &&
|
|
IsStringInit(StructuredList->getInit(0), T, SemaRef.Context) ==
|
|
SIF_None) {
|
|
unsigned DK = diag::ext_excess_initializers_in_char_array_initializer;
|
|
if (SemaRef.getLangOpts().CPlusPlus) {
|
|
DK = diag::err_excess_initializers_in_char_array_initializer;
|
|
hadError = true;
|
|
}
|
|
// Special-case
|
|
SemaRef.Diag(IList->getInit(Index)->getLocStart(), DK)
|
|
<< IList->getInit(Index)->getSourceRange();
|
|
} else if (!T->isIncompleteType()) {
|
|
// Don't complain for incomplete types, since we'll get an error
|
|
// elsewhere
|
|
QualType CurrentObjectType = StructuredList->getType();
|
|
int initKind =
|
|
CurrentObjectType->isArrayType()? 0 :
|
|
CurrentObjectType->isVectorType()? 1 :
|
|
CurrentObjectType->isScalarType()? 2 :
|
|
CurrentObjectType->isUnionType()? 3 :
|
|
4;
|
|
|
|
unsigned DK = diag::ext_excess_initializers;
|
|
if (SemaRef.getLangOpts().CPlusPlus) {
|
|
DK = diag::err_excess_initializers;
|
|
hadError = true;
|
|
}
|
|
if (SemaRef.getLangOpts().OpenCL && initKind == 1) {
|
|
DK = diag::err_excess_initializers;
|
|
hadError = true;
|
|
}
|
|
|
|
SemaRef.Diag(IList->getInit(Index)->getLocStart(), DK)
|
|
<< initKind << IList->getInit(Index)->getSourceRange();
|
|
}
|
|
}
|
|
|
|
if (!VerifyOnly && T->isScalarType() && IList->getNumInits() == 1 &&
|
|
!TopLevelObject)
|
|
SemaRef.Diag(IList->getLocStart(), diag::warn_braces_around_scalar_init)
|
|
<< IList->getSourceRange()
|
|
<< FixItHint::CreateRemoval(IList->getLocStart())
|
|
<< FixItHint::CreateRemoval(IList->getLocEnd());
|
|
}
|
|
|
|
void InitListChecker::CheckListElementTypes(const InitializedEntity &Entity,
|
|
InitListExpr *IList,
|
|
QualType &DeclType,
|
|
bool SubobjectIsDesignatorContext,
|
|
unsigned &Index,
|
|
InitListExpr *StructuredList,
|
|
unsigned &StructuredIndex,
|
|
bool TopLevelObject) {
|
|
if (DeclType->isAnyComplexType() && SubobjectIsDesignatorContext) {
|
|
// Explicitly braced initializer for complex type can be real+imaginary
|
|
// parts.
|
|
CheckComplexType(Entity, IList, DeclType, Index,
|
|
StructuredList, StructuredIndex);
|
|
} else if (DeclType->isScalarType()) {
|
|
CheckScalarType(Entity, IList, DeclType, Index,
|
|
StructuredList, StructuredIndex);
|
|
} else if (DeclType->isVectorType()) {
|
|
CheckVectorType(Entity, IList, DeclType, Index,
|
|
StructuredList, StructuredIndex);
|
|
} else if (DeclType->isRecordType()) {
|
|
assert(DeclType->isAggregateType() &&
|
|
"non-aggregate records should be handed in CheckSubElementType");
|
|
RecordDecl *RD = DeclType->getAs<RecordType>()->getDecl();
|
|
CheckStructUnionTypes(Entity, IList, DeclType, RD->field_begin(),
|
|
SubobjectIsDesignatorContext, Index,
|
|
StructuredList, StructuredIndex,
|
|
TopLevelObject);
|
|
} else if (DeclType->isArrayType()) {
|
|
llvm::APSInt Zero(
|
|
SemaRef.Context.getTypeSize(SemaRef.Context.getSizeType()),
|
|
false);
|
|
CheckArrayType(Entity, IList, DeclType, Zero,
|
|
SubobjectIsDesignatorContext, Index,
|
|
StructuredList, StructuredIndex);
|
|
} else if (DeclType->isVoidType() || DeclType->isFunctionType()) {
|
|
// This type is invalid, issue a diagnostic.
|
|
++Index;
|
|
if (!VerifyOnly)
|
|
SemaRef.Diag(IList->getLocStart(), diag::err_illegal_initializer_type)
|
|
<< DeclType;
|
|
hadError = true;
|
|
} else if (DeclType->isReferenceType()) {
|
|
CheckReferenceType(Entity, IList, DeclType, Index,
|
|
StructuredList, StructuredIndex);
|
|
} else if (DeclType->isObjCObjectType()) {
|
|
if (!VerifyOnly)
|
|
SemaRef.Diag(IList->getLocStart(), diag::err_init_objc_class)
|
|
<< DeclType;
|
|
hadError = true;
|
|
} else {
|
|
if (!VerifyOnly)
|
|
SemaRef.Diag(IList->getLocStart(), diag::err_illegal_initializer_type)
|
|
<< DeclType;
|
|
hadError = true;
|
|
}
|
|
}
|
|
|
|
void InitListChecker::CheckSubElementType(const InitializedEntity &Entity,
|
|
InitListExpr *IList,
|
|
QualType ElemType,
|
|
unsigned &Index,
|
|
InitListExpr *StructuredList,
|
|
unsigned &StructuredIndex) {
|
|
Expr *expr = IList->getInit(Index);
|
|
|
|
if (ElemType->isReferenceType())
|
|
return CheckReferenceType(Entity, IList, ElemType, Index,
|
|
StructuredList, StructuredIndex);
|
|
|
|
if (InitListExpr *SubInitList = dyn_cast<InitListExpr>(expr)) {
|
|
if (!ElemType->isRecordType() || ElemType->isAggregateType()) {
|
|
InitListExpr *InnerStructuredList
|
|
= getStructuredSubobjectInit(IList, Index, ElemType,
|
|
StructuredList, StructuredIndex,
|
|
SubInitList->getSourceRange());
|
|
CheckExplicitInitList(Entity, SubInitList, ElemType,
|
|
InnerStructuredList);
|
|
++StructuredIndex;
|
|
++Index;
|
|
return;
|
|
}
|
|
assert(SemaRef.getLangOpts().CPlusPlus &&
|
|
"non-aggregate records are only possible in C++");
|
|
// C++ initialization is handled later.
|
|
} else if (isa<ImplicitValueInitExpr>(expr)) {
|
|
// This happens during template instantiation when we see an InitListExpr
|
|
// that we've already checked once.
|
|
assert(SemaRef.Context.hasSameType(expr->getType(), ElemType) &&
|
|
"found implicit initialization for the wrong type");
|
|
if (!VerifyOnly)
|
|
UpdateStructuredListElement(StructuredList, StructuredIndex, expr);
|
|
++Index;
|
|
return;
|
|
}
|
|
|
|
// FIXME: Need to handle atomic aggregate types with implicit init lists.
|
|
if (ElemType->isScalarType() || ElemType->isAtomicType())
|
|
return CheckScalarType(Entity, IList, ElemType, Index,
|
|
StructuredList, StructuredIndex);
|
|
|
|
assert((ElemType->isRecordType() || ElemType->isVectorType() ||
|
|
ElemType->isArrayType()) && "Unexpected type");
|
|
|
|
if (const ArrayType *arrayType = SemaRef.Context.getAsArrayType(ElemType)) {
|
|
// arrayType can be incomplete if we're initializing a flexible
|
|
// array member. There's nothing we can do with the completed
|
|
// type here, though.
|
|
|
|
if (IsStringInit(expr, arrayType, SemaRef.Context) == SIF_None) {
|
|
if (!VerifyOnly) {
|
|
CheckStringInit(expr, ElemType, arrayType, SemaRef);
|
|
UpdateStructuredListElement(StructuredList, StructuredIndex, expr);
|
|
}
|
|
++Index;
|
|
return;
|
|
}
|
|
|
|
// Fall through for subaggregate initialization.
|
|
|
|
} else if (SemaRef.getLangOpts().CPlusPlus) {
|
|
// C++ [dcl.init.aggr]p12:
|
|
// All implicit type conversions (clause 4) are considered when
|
|
// initializing the aggregate member with an initializer from
|
|
// an initializer-list. If the initializer can initialize a
|
|
// member, the member is initialized. [...]
|
|
|
|
// FIXME: Better EqualLoc?
|
|
InitializationKind Kind =
|
|
InitializationKind::CreateCopy(expr->getLocStart(), SourceLocation());
|
|
InitializationSequence Seq(SemaRef, Entity, Kind, expr);
|
|
|
|
if (Seq) {
|
|
if (!VerifyOnly) {
|
|
ExprResult Result =
|
|
Seq.Perform(SemaRef, Entity, Kind, expr);
|
|
if (Result.isInvalid())
|
|
hadError = true;
|
|
|
|
UpdateStructuredListElement(StructuredList, StructuredIndex,
|
|
Result.getAs<Expr>());
|
|
}
|
|
++Index;
|
|
return;
|
|
}
|
|
|
|
// Fall through for subaggregate initialization
|
|
} else {
|
|
// C99 6.7.8p13:
|
|
//
|
|
// The initializer for a structure or union object that has
|
|
// automatic storage duration shall be either an initializer
|
|
// list as described below, or a single expression that has
|
|
// compatible structure or union type. In the latter case, the
|
|
// initial value of the object, including unnamed members, is
|
|
// that of the expression.
|
|
ExprResult ExprRes = expr;
|
|
if ((ElemType->isRecordType() || ElemType->isVectorType()) &&
|
|
SemaRef.CheckSingleAssignmentConstraints(ElemType, ExprRes,
|
|
!VerifyOnly)
|
|
!= Sema::Incompatible) {
|
|
if (ExprRes.isInvalid())
|
|
hadError = true;
|
|
else {
|
|
ExprRes = SemaRef.DefaultFunctionArrayLvalueConversion(ExprRes.get());
|
|
if (ExprRes.isInvalid())
|
|
hadError = true;
|
|
}
|
|
UpdateStructuredListElement(StructuredList, StructuredIndex,
|
|
ExprRes.getAs<Expr>());
|
|
++Index;
|
|
return;
|
|
}
|
|
ExprRes.get();
|
|
// Fall through for subaggregate initialization
|
|
}
|
|
|
|
// C++ [dcl.init.aggr]p12:
|
|
//
|
|
// [...] Otherwise, if the member is itself a non-empty
|
|
// subaggregate, brace elision is assumed and the initializer is
|
|
// considered for the initialization of the first member of
|
|
// the subaggregate.
|
|
if (!SemaRef.getLangOpts().OpenCL &&
|
|
(ElemType->isAggregateType() || ElemType->isVectorType())) {
|
|
CheckImplicitInitList(Entity, IList, ElemType, Index, StructuredList,
|
|
StructuredIndex);
|
|
++StructuredIndex;
|
|
} else {
|
|
if (!VerifyOnly) {
|
|
// We cannot initialize this element, so let
|
|
// PerformCopyInitialization produce the appropriate diagnostic.
|
|
SemaRef.PerformCopyInitialization(Entity, SourceLocation(), expr,
|
|
/*TopLevelOfInitList=*/true);
|
|
}
|
|
hadError = true;
|
|
++Index;
|
|
++StructuredIndex;
|
|
}
|
|
}
|
|
|
|
void InitListChecker::CheckComplexType(const InitializedEntity &Entity,
|
|
InitListExpr *IList, QualType DeclType,
|
|
unsigned &Index,
|
|
InitListExpr *StructuredList,
|
|
unsigned &StructuredIndex) {
|
|
assert(Index == 0 && "Index in explicit init list must be zero");
|
|
|
|
// As an extension, clang supports complex initializers, which initialize
|
|
// a complex number component-wise. When an explicit initializer list for
|
|
// a complex number contains two two initializers, this extension kicks in:
|
|
// it exepcts the initializer list to contain two elements convertible to
|
|
// the element type of the complex type. The first element initializes
|
|
// the real part, and the second element intitializes the imaginary part.
|
|
|
|
if (IList->getNumInits() != 2)
|
|
return CheckScalarType(Entity, IList, DeclType, Index, StructuredList,
|
|
StructuredIndex);
|
|
|
|
// This is an extension in C. (The builtin _Complex type does not exist
|
|
// in the C++ standard.)
|
|
if (!SemaRef.getLangOpts().CPlusPlus && !VerifyOnly)
|
|
SemaRef.Diag(IList->getLocStart(), diag::ext_complex_component_init)
|
|
<< IList->getSourceRange();
|
|
|
|
// Initialize the complex number.
|
|
QualType elementType = DeclType->getAs<ComplexType>()->getElementType();
|
|
InitializedEntity ElementEntity =
|
|
InitializedEntity::InitializeElement(SemaRef.Context, 0, Entity);
|
|
|
|
for (unsigned i = 0; i < 2; ++i) {
|
|
ElementEntity.setElementIndex(Index);
|
|
CheckSubElementType(ElementEntity, IList, elementType, Index,
|
|
StructuredList, StructuredIndex);
|
|
}
|
|
}
|
|
|
|
|
|
void InitListChecker::CheckScalarType(const InitializedEntity &Entity,
|
|
InitListExpr *IList, QualType DeclType,
|
|
unsigned &Index,
|
|
InitListExpr *StructuredList,
|
|
unsigned &StructuredIndex) {
|
|
if (Index >= IList->getNumInits()) {
|
|
if (!VerifyOnly)
|
|
SemaRef.Diag(IList->getLocStart(),
|
|
SemaRef.getLangOpts().CPlusPlus11 ?
|
|
diag::warn_cxx98_compat_empty_scalar_initializer :
|
|
diag::err_empty_scalar_initializer)
|
|
<< IList->getSourceRange();
|
|
hadError = !SemaRef.getLangOpts().CPlusPlus11;
|
|
++Index;
|
|
++StructuredIndex;
|
|
return;
|
|
}
|
|
|
|
Expr *expr = IList->getInit(Index);
|
|
if (InitListExpr *SubIList = dyn_cast<InitListExpr>(expr)) {
|
|
// FIXME: This is invalid, and accepting it causes overload resolution
|
|
// to pick the wrong overload in some corner cases.
|
|
if (!VerifyOnly)
|
|
SemaRef.Diag(SubIList->getLocStart(),
|
|
diag::ext_many_braces_around_scalar_init)
|
|
<< SubIList->getSourceRange();
|
|
|
|
CheckScalarType(Entity, SubIList, DeclType, Index, StructuredList,
|
|
StructuredIndex);
|
|
return;
|
|
} else if (isa<DesignatedInitExpr>(expr)) {
|
|
if (!VerifyOnly)
|
|
SemaRef.Diag(expr->getLocStart(),
|
|
diag::err_designator_for_scalar_init)
|
|
<< DeclType << expr->getSourceRange();
|
|
hadError = true;
|
|
++Index;
|
|
++StructuredIndex;
|
|
return;
|
|
}
|
|
|
|
if (VerifyOnly) {
|
|
if (!SemaRef.CanPerformCopyInitialization(Entity,expr))
|
|
hadError = true;
|
|
++Index;
|
|
return;
|
|
}
|
|
|
|
ExprResult Result =
|
|
SemaRef.PerformCopyInitialization(Entity, expr->getLocStart(), expr,
|
|
/*TopLevelOfInitList=*/true);
|
|
|
|
Expr *ResultExpr = nullptr;
|
|
|
|
if (Result.isInvalid())
|
|
hadError = true; // types weren't compatible.
|
|
else {
|
|
ResultExpr = Result.getAs<Expr>();
|
|
|
|
if (ResultExpr != expr) {
|
|
// The type was promoted, update initializer list.
|
|
IList->setInit(Index, ResultExpr);
|
|
}
|
|
}
|
|
if (hadError)
|
|
++StructuredIndex;
|
|
else
|
|
UpdateStructuredListElement(StructuredList, StructuredIndex, ResultExpr);
|
|
++Index;
|
|
}
|
|
|
|
void InitListChecker::CheckReferenceType(const InitializedEntity &Entity,
|
|
InitListExpr *IList, QualType DeclType,
|
|
unsigned &Index,
|
|
InitListExpr *StructuredList,
|
|
unsigned &StructuredIndex) {
|
|
if (Index >= IList->getNumInits()) {
|
|
// FIXME: It would be wonderful if we could point at the actual member. In
|
|
// general, it would be useful to pass location information down the stack,
|
|
// so that we know the location (or decl) of the "current object" being
|
|
// initialized.
|
|
if (!VerifyOnly)
|
|
SemaRef.Diag(IList->getLocStart(),
|
|
diag::err_init_reference_member_uninitialized)
|
|
<< DeclType
|
|
<< IList->getSourceRange();
|
|
hadError = true;
|
|
++Index;
|
|
++StructuredIndex;
|
|
return;
|
|
}
|
|
|
|
Expr *expr = IList->getInit(Index);
|
|
if (isa<InitListExpr>(expr) && !SemaRef.getLangOpts().CPlusPlus11) {
|
|
if (!VerifyOnly)
|
|
SemaRef.Diag(IList->getLocStart(), diag::err_init_non_aggr_init_list)
|
|
<< DeclType << IList->getSourceRange();
|
|
hadError = true;
|
|
++Index;
|
|
++StructuredIndex;
|
|
return;
|
|
}
|
|
|
|
if (VerifyOnly) {
|
|
if (!SemaRef.CanPerformCopyInitialization(Entity,expr))
|
|
hadError = true;
|
|
++Index;
|
|
return;
|
|
}
|
|
|
|
ExprResult Result =
|
|
SemaRef.PerformCopyInitialization(Entity, expr->getLocStart(), expr,
|
|
/*TopLevelOfInitList=*/true);
|
|
|
|
if (Result.isInvalid())
|
|
hadError = true;
|
|
|
|
expr = Result.getAs<Expr>();
|
|
IList->setInit(Index, expr);
|
|
|
|
if (hadError)
|
|
++StructuredIndex;
|
|
else
|
|
UpdateStructuredListElement(StructuredList, StructuredIndex, expr);
|
|
++Index;
|
|
}
|
|
|
|
void InitListChecker::CheckVectorType(const InitializedEntity &Entity,
|
|
InitListExpr *IList, QualType DeclType,
|
|
unsigned &Index,
|
|
InitListExpr *StructuredList,
|
|
unsigned &StructuredIndex) {
|
|
const VectorType *VT = DeclType->getAs<VectorType>();
|
|
unsigned maxElements = VT->getNumElements();
|
|
unsigned numEltsInit = 0;
|
|
QualType elementType = VT->getElementType();
|
|
|
|
if (Index >= IList->getNumInits()) {
|
|
// Make sure the element type can be value-initialized.
|
|
if (VerifyOnly)
|
|
CheckEmptyInitializable(
|
|
InitializedEntity::InitializeElement(SemaRef.Context, 0, Entity),
|
|
IList->getLocEnd());
|
|
return;
|
|
}
|
|
|
|
if (!SemaRef.getLangOpts().OpenCL) {
|
|
// If the initializing element is a vector, try to copy-initialize
|
|
// instead of breaking it apart (which is doomed to failure anyway).
|
|
Expr *Init = IList->getInit(Index);
|
|
if (!isa<InitListExpr>(Init) && Init->getType()->isVectorType()) {
|
|
if (VerifyOnly) {
|
|
if (!SemaRef.CanPerformCopyInitialization(Entity, Init))
|
|
hadError = true;
|
|
++Index;
|
|
return;
|
|
}
|
|
|
|
ExprResult Result =
|
|
SemaRef.PerformCopyInitialization(Entity, Init->getLocStart(), Init,
|
|
/*TopLevelOfInitList=*/true);
|
|
|
|
Expr *ResultExpr = nullptr;
|
|
if (Result.isInvalid())
|
|
hadError = true; // types weren't compatible.
|
|
else {
|
|
ResultExpr = Result.getAs<Expr>();
|
|
|
|
if (ResultExpr != Init) {
|
|
// The type was promoted, update initializer list.
|
|
IList->setInit(Index, ResultExpr);
|
|
}
|
|
}
|
|
if (hadError)
|
|
++StructuredIndex;
|
|
else
|
|
UpdateStructuredListElement(StructuredList, StructuredIndex,
|
|
ResultExpr);
|
|
++Index;
|
|
return;
|
|
}
|
|
|
|
InitializedEntity ElementEntity =
|
|
InitializedEntity::InitializeElement(SemaRef.Context, 0, Entity);
|
|
|
|
for (unsigned i = 0; i < maxElements; ++i, ++numEltsInit) {
|
|
// Don't attempt to go past the end of the init list
|
|
if (Index >= IList->getNumInits()) {
|
|
if (VerifyOnly)
|
|
CheckEmptyInitializable(ElementEntity, IList->getLocEnd());
|
|
break;
|
|
}
|
|
|
|
ElementEntity.setElementIndex(Index);
|
|
CheckSubElementType(ElementEntity, IList, elementType, Index,
|
|
StructuredList, StructuredIndex);
|
|
}
|
|
|
|
if (VerifyOnly)
|
|
return;
|
|
|
|
bool isBigEndian = SemaRef.Context.getTargetInfo().isBigEndian();
|
|
const VectorType *T = Entity.getType()->getAs<VectorType>();
|
|
if (isBigEndian && (T->getVectorKind() == VectorType::NeonVector ||
|
|
T->getVectorKind() == VectorType::NeonPolyVector)) {
|
|
// The ability to use vector initializer lists is a GNU vector extension
|
|
// and is unrelated to the NEON intrinsics in arm_neon.h. On little
|
|
// endian machines it works fine, however on big endian machines it
|
|
// exhibits surprising behaviour:
|
|
//
|
|
// uint32x2_t x = {42, 64};
|
|
// return vget_lane_u32(x, 0); // Will return 64.
|
|
//
|
|
// Because of this, explicitly call out that it is non-portable.
|
|
//
|
|
SemaRef.Diag(IList->getLocStart(),
|
|
diag::warn_neon_vector_initializer_non_portable);
|
|
|
|
const char *typeCode;
|
|
unsigned typeSize = SemaRef.Context.getTypeSize(elementType);
|
|
|
|
if (elementType->isFloatingType())
|
|
typeCode = "f";
|
|
else if (elementType->isSignedIntegerType())
|
|
typeCode = "s";
|
|
else if (elementType->isUnsignedIntegerType())
|
|
typeCode = "u";
|
|
else
|
|
llvm_unreachable("Invalid element type!");
|
|
|
|
SemaRef.Diag(IList->getLocStart(),
|
|
SemaRef.Context.getTypeSize(VT) > 64 ?
|
|
diag::note_neon_vector_initializer_non_portable_q :
|
|
diag::note_neon_vector_initializer_non_portable)
|
|
<< typeCode << typeSize;
|
|
}
|
|
|
|
return;
|
|
}
|
|
|
|
InitializedEntity ElementEntity =
|
|
InitializedEntity::InitializeElement(SemaRef.Context, 0, Entity);
|
|
|
|
// OpenCL initializers allows vectors to be constructed from vectors.
|
|
for (unsigned i = 0; i < maxElements; ++i) {
|
|
// Don't attempt to go past the end of the init list
|
|
if (Index >= IList->getNumInits())
|
|
break;
|
|
|
|
ElementEntity.setElementIndex(Index);
|
|
|
|
QualType IType = IList->getInit(Index)->getType();
|
|
if (!IType->isVectorType()) {
|
|
CheckSubElementType(ElementEntity, IList, elementType, Index,
|
|
StructuredList, StructuredIndex);
|
|
++numEltsInit;
|
|
} else {
|
|
QualType VecType;
|
|
const VectorType *IVT = IType->getAs<VectorType>();
|
|
unsigned numIElts = IVT->getNumElements();
|
|
|
|
if (IType->isExtVectorType())
|
|
VecType = SemaRef.Context.getExtVectorType(elementType, numIElts);
|
|
else
|
|
VecType = SemaRef.Context.getVectorType(elementType, numIElts,
|
|
IVT->getVectorKind());
|
|
CheckSubElementType(ElementEntity, IList, VecType, Index,
|
|
StructuredList, StructuredIndex);
|
|
numEltsInit += numIElts;
|
|
}
|
|
}
|
|
|
|
// OpenCL requires all elements to be initialized.
|
|
if (numEltsInit != maxElements) {
|
|
if (!VerifyOnly)
|
|
SemaRef.Diag(IList->getLocStart(),
|
|
diag::err_vector_incorrect_num_initializers)
|
|
<< (numEltsInit < maxElements) << maxElements << numEltsInit;
|
|
hadError = true;
|
|
}
|
|
}
|
|
|
|
void InitListChecker::CheckArrayType(const InitializedEntity &Entity,
|
|
InitListExpr *IList, QualType &DeclType,
|
|
llvm::APSInt elementIndex,
|
|
bool SubobjectIsDesignatorContext,
|
|
unsigned &Index,
|
|
InitListExpr *StructuredList,
|
|
unsigned &StructuredIndex) {
|
|
const ArrayType *arrayType = SemaRef.Context.getAsArrayType(DeclType);
|
|
|
|
// Check for the special-case of initializing an array with a string.
|
|
if (Index < IList->getNumInits()) {
|
|
if (IsStringInit(IList->getInit(Index), arrayType, SemaRef.Context) ==
|
|
SIF_None) {
|
|
// We place the string literal directly into the resulting
|
|
// initializer list. This is the only place where the structure
|
|
// of the structured initializer list doesn't match exactly,
|
|
// because doing so would involve allocating one character
|
|
// constant for each string.
|
|
if (!VerifyOnly) {
|
|
CheckStringInit(IList->getInit(Index), DeclType, arrayType, SemaRef);
|
|
UpdateStructuredListElement(StructuredList, StructuredIndex,
|
|
IList->getInit(Index));
|
|
StructuredList->resizeInits(SemaRef.Context, StructuredIndex);
|
|
}
|
|
++Index;
|
|
return;
|
|
}
|
|
}
|
|
if (const VariableArrayType *VAT = dyn_cast<VariableArrayType>(arrayType)) {
|
|
// Check for VLAs; in standard C it would be possible to check this
|
|
// earlier, but I don't know where clang accepts VLAs (gcc accepts
|
|
// them in all sorts of strange places).
|
|
if (!VerifyOnly)
|
|
SemaRef.Diag(VAT->getSizeExpr()->getLocStart(),
|
|
diag::err_variable_object_no_init)
|
|
<< VAT->getSizeExpr()->getSourceRange();
|
|
hadError = true;
|
|
++Index;
|
|
++StructuredIndex;
|
|
return;
|
|
}
|
|
|
|
// We might know the maximum number of elements in advance.
|
|
llvm::APSInt maxElements(elementIndex.getBitWidth(),
|
|
elementIndex.isUnsigned());
|
|
bool maxElementsKnown = false;
|
|
if (const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(arrayType)) {
|
|
maxElements = CAT->getSize();
|
|
elementIndex = elementIndex.extOrTrunc(maxElements.getBitWidth());
|
|
elementIndex.setIsUnsigned(maxElements.isUnsigned());
|
|
maxElementsKnown = true;
|
|
}
|
|
|
|
QualType elementType = arrayType->getElementType();
|
|
while (Index < IList->getNumInits()) {
|
|
Expr *Init = IList->getInit(Index);
|
|
if (DesignatedInitExpr *DIE = dyn_cast<DesignatedInitExpr>(Init)) {
|
|
// If we're not the subobject that matches up with the '{' for
|
|
// the designator, we shouldn't be handling the
|
|
// designator. Return immediately.
|
|
if (!SubobjectIsDesignatorContext)
|
|
return;
|
|
|
|
// Handle this designated initializer. elementIndex will be
|
|
// updated to be the next array element we'll initialize.
|
|
if (CheckDesignatedInitializer(Entity, IList, DIE, 0,
|
|
DeclType, nullptr, &elementIndex, Index,
|
|
StructuredList, StructuredIndex, true,
|
|
false)) {
|
|
hadError = true;
|
|
continue;
|
|
}
|
|
|
|
if (elementIndex.getBitWidth() > maxElements.getBitWidth())
|
|
maxElements = maxElements.extend(elementIndex.getBitWidth());
|
|
else if (elementIndex.getBitWidth() < maxElements.getBitWidth())
|
|
elementIndex = elementIndex.extend(maxElements.getBitWidth());
|
|
elementIndex.setIsUnsigned(maxElements.isUnsigned());
|
|
|
|
// If the array is of incomplete type, keep track of the number of
|
|
// elements in the initializer.
|
|
if (!maxElementsKnown && elementIndex > maxElements)
|
|
maxElements = elementIndex;
|
|
|
|
continue;
|
|
}
|
|
|
|
// If we know the maximum number of elements, and we've already
|
|
// hit it, stop consuming elements in the initializer list.
|
|
if (maxElementsKnown && elementIndex == maxElements)
|
|
break;
|
|
|
|
InitializedEntity ElementEntity =
|
|
InitializedEntity::InitializeElement(SemaRef.Context, StructuredIndex,
|
|
Entity);
|
|
// Check this element.
|
|
CheckSubElementType(ElementEntity, IList, elementType, Index,
|
|
StructuredList, StructuredIndex);
|
|
++elementIndex;
|
|
|
|
// If the array is of incomplete type, keep track of the number of
|
|
// elements in the initializer.
|
|
if (!maxElementsKnown && elementIndex > maxElements)
|
|
maxElements = elementIndex;
|
|
}
|
|
if (!hadError && DeclType->isIncompleteArrayType() && !VerifyOnly) {
|
|
// If this is an incomplete array type, the actual type needs to
|
|
// be calculated here.
|
|
llvm::APSInt Zero(maxElements.getBitWidth(), maxElements.isUnsigned());
|
|
if (maxElements == Zero) {
|
|
// Sizing an array implicitly to zero is not allowed by ISO C,
|
|
// but is supported by GNU.
|
|
SemaRef.Diag(IList->getLocStart(),
|
|
diag::ext_typecheck_zero_array_size);
|
|
}
|
|
|
|
DeclType = SemaRef.Context.getConstantArrayType(elementType, maxElements,
|
|
ArrayType::Normal, 0);
|
|
}
|
|
if (!hadError && VerifyOnly) {
|
|
// Check if there are any members of the array that get value-initialized.
|
|
// If so, check if doing that is possible.
|
|
// FIXME: This needs to detect holes left by designated initializers too.
|
|
if (maxElementsKnown && elementIndex < maxElements)
|
|
CheckEmptyInitializable(InitializedEntity::InitializeElement(
|
|
SemaRef.Context, 0, Entity),
|
|
IList->getLocEnd());
|
|
}
|
|
}
|
|
|
|
bool InitListChecker::CheckFlexibleArrayInit(const InitializedEntity &Entity,
|
|
Expr *InitExpr,
|
|
FieldDecl *Field,
|
|
bool TopLevelObject) {
|
|
// Handle GNU flexible array initializers.
|
|
unsigned FlexArrayDiag;
|
|
if (isa<InitListExpr>(InitExpr) &&
|
|
cast<InitListExpr>(InitExpr)->getNumInits() == 0) {
|
|
// Empty flexible array init always allowed as an extension
|
|
FlexArrayDiag = diag::ext_flexible_array_init;
|
|
} else if (SemaRef.getLangOpts().CPlusPlus) {
|
|
// Disallow flexible array init in C++; it is not required for gcc
|
|
// compatibility, and it needs work to IRGen correctly in general.
|
|
FlexArrayDiag = diag::err_flexible_array_init;
|
|
} else if (!TopLevelObject) {
|
|
// Disallow flexible array init on non-top-level object
|
|
FlexArrayDiag = diag::err_flexible_array_init;
|
|
} else if (Entity.getKind() != InitializedEntity::EK_Variable) {
|
|
// Disallow flexible array init on anything which is not a variable.
|
|
FlexArrayDiag = diag::err_flexible_array_init;
|
|
} else if (cast<VarDecl>(Entity.getDecl())->hasLocalStorage()) {
|
|
// Disallow flexible array init on local variables.
|
|
FlexArrayDiag = diag::err_flexible_array_init;
|
|
} else {
|
|
// Allow other cases.
|
|
FlexArrayDiag = diag::ext_flexible_array_init;
|
|
}
|
|
|
|
if (!VerifyOnly) {
|
|
SemaRef.Diag(InitExpr->getLocStart(),
|
|
FlexArrayDiag)
|
|
<< InitExpr->getLocStart();
|
|
SemaRef.Diag(Field->getLocation(), diag::note_flexible_array_member)
|
|
<< Field;
|
|
}
|
|
|
|
return FlexArrayDiag != diag::ext_flexible_array_init;
|
|
}
|
|
|
|
void InitListChecker::CheckStructUnionTypes(const InitializedEntity &Entity,
|
|
InitListExpr *IList,
|
|
QualType DeclType,
|
|
RecordDecl::field_iterator Field,
|
|
bool SubobjectIsDesignatorContext,
|
|
unsigned &Index,
|
|
InitListExpr *StructuredList,
|
|
unsigned &StructuredIndex,
|
|
bool TopLevelObject) {
|
|
RecordDecl* structDecl = DeclType->getAs<RecordType>()->getDecl();
|
|
|
|
// If the record is invalid, some of it's members are invalid. To avoid
|
|
// confusion, we forgo checking the intializer for the entire record.
|
|
if (structDecl->isInvalidDecl()) {
|
|
// Assume it was supposed to consume a single initializer.
|
|
++Index;
|
|
hadError = true;
|
|
return;
|
|
}
|
|
|
|
if (DeclType->isUnionType() && IList->getNumInits() == 0) {
|
|
RecordDecl *RD = DeclType->getAs<RecordType>()->getDecl();
|
|
|
|
// If there's a default initializer, use it.
|
|
if (isa<CXXRecordDecl>(RD) && cast<CXXRecordDecl>(RD)->hasInClassInitializer()) {
|
|
if (VerifyOnly)
|
|
return;
|
|
for (RecordDecl::field_iterator FieldEnd = RD->field_end();
|
|
Field != FieldEnd; ++Field) {
|
|
if (Field->hasInClassInitializer()) {
|
|
StructuredList->setInitializedFieldInUnion(*Field);
|
|
// FIXME: Actually build a CXXDefaultInitExpr?
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
|
|
// Value-initialize the first member of the union that isn't an unnamed
|
|
// bitfield.
|
|
for (RecordDecl::field_iterator FieldEnd = RD->field_end();
|
|
Field != FieldEnd; ++Field) {
|
|
if (!Field->isUnnamedBitfield()) {
|
|
if (VerifyOnly)
|
|
CheckEmptyInitializable(
|
|
InitializedEntity::InitializeMember(*Field, &Entity),
|
|
IList->getLocEnd());
|
|
else
|
|
StructuredList->setInitializedFieldInUnion(*Field);
|
|
break;
|
|
}
|
|
}
|
|
return;
|
|
}
|
|
|
|
// If structDecl is a forward declaration, this loop won't do
|
|
// anything except look at designated initializers; That's okay,
|
|
// because an error should get printed out elsewhere. It might be
|
|
// worthwhile to skip over the rest of the initializer, though.
|
|
RecordDecl *RD = DeclType->getAs<RecordType>()->getDecl();
|
|
RecordDecl::field_iterator FieldEnd = RD->field_end();
|
|
bool InitializedSomething = false;
|
|
bool CheckForMissingFields = true;
|
|
while (Index < IList->getNumInits()) {
|
|
Expr *Init = IList->getInit(Index);
|
|
|
|
if (DesignatedInitExpr *DIE = dyn_cast<DesignatedInitExpr>(Init)) {
|
|
// If we're not the subobject that matches up with the '{' for
|
|
// the designator, we shouldn't be handling the
|
|
// designator. Return immediately.
|
|
if (!SubobjectIsDesignatorContext)
|
|
return;
|
|
|
|
// Handle this designated initializer. Field will be updated to
|
|
// the next field that we'll be initializing.
|
|
if (CheckDesignatedInitializer(Entity, IList, DIE, 0,
|
|
DeclType, &Field, nullptr, Index,
|
|
StructuredList, StructuredIndex,
|
|
true, TopLevelObject))
|
|
hadError = true;
|
|
|
|
InitializedSomething = true;
|
|
|
|
// Disable check for missing fields when designators are used.
|
|
// This matches gcc behaviour.
|
|
CheckForMissingFields = false;
|
|
continue;
|
|
}
|
|
|
|
if (Field == FieldEnd) {
|
|
// We've run out of fields. We're done.
|
|
break;
|
|
}
|
|
|
|
// We've already initialized a member of a union. We're done.
|
|
if (InitializedSomething && DeclType->isUnionType())
|
|
break;
|
|
|
|
// If we've hit the flexible array member at the end, we're done.
|
|
if (Field->getType()->isIncompleteArrayType())
|
|
break;
|
|
|
|
if (Field->isUnnamedBitfield()) {
|
|
// Don't initialize unnamed bitfields, e.g. "int : 20;"
|
|
++Field;
|
|
continue;
|
|
}
|
|
|
|
// Make sure we can use this declaration.
|
|
bool InvalidUse;
|
|
if (VerifyOnly)
|
|
InvalidUse = !SemaRef.CanUseDecl(*Field);
|
|
else
|
|
InvalidUse = SemaRef.DiagnoseUseOfDecl(*Field,
|
|
IList->getInit(Index)->getLocStart());
|
|
if (InvalidUse) {
|
|
++Index;
|
|
++Field;
|
|
hadError = true;
|
|
continue;
|
|
}
|
|
|
|
InitializedEntity MemberEntity =
|
|
InitializedEntity::InitializeMember(*Field, &Entity);
|
|
CheckSubElementType(MemberEntity, IList, Field->getType(), Index,
|
|
StructuredList, StructuredIndex);
|
|
InitializedSomething = true;
|
|
|
|
if (DeclType->isUnionType() && !VerifyOnly) {
|
|
// Initialize the first field within the union.
|
|
StructuredList->setInitializedFieldInUnion(*Field);
|
|
}
|
|
|
|
++Field;
|
|
}
|
|
|
|
// Emit warnings for missing struct field initializers.
|
|
if (!VerifyOnly && InitializedSomething && CheckForMissingFields &&
|
|
Field != FieldEnd && !Field->getType()->isIncompleteArrayType() &&
|
|
!DeclType->isUnionType()) {
|
|
// It is possible we have one or more unnamed bitfields remaining.
|
|
// Find first (if any) named field and emit warning.
|
|
for (RecordDecl::field_iterator it = Field, end = RD->field_end();
|
|
it != end; ++it) {
|
|
if (!it->isUnnamedBitfield() && !it->hasInClassInitializer()) {
|
|
SemaRef.Diag(IList->getSourceRange().getEnd(),
|
|
diag::warn_missing_field_initializers) << *it;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
// Check that any remaining fields can be value-initialized.
|
|
if (VerifyOnly && Field != FieldEnd && !DeclType->isUnionType() &&
|
|
!Field->getType()->isIncompleteArrayType()) {
|
|
// FIXME: Should check for holes left by designated initializers too.
|
|
for (; Field != FieldEnd && !hadError; ++Field) {
|
|
if (!Field->isUnnamedBitfield() && !Field->hasInClassInitializer())
|
|
CheckEmptyInitializable(
|
|
InitializedEntity::InitializeMember(*Field, &Entity),
|
|
IList->getLocEnd());
|
|
}
|
|
}
|
|
|
|
if (Field == FieldEnd || !Field->getType()->isIncompleteArrayType() ||
|
|
Index >= IList->getNumInits())
|
|
return;
|
|
|
|
if (CheckFlexibleArrayInit(Entity, IList->getInit(Index), *Field,
|
|
TopLevelObject)) {
|
|
hadError = true;
|
|
++Index;
|
|
return;
|
|
}
|
|
|
|
InitializedEntity MemberEntity =
|
|
InitializedEntity::InitializeMember(*Field, &Entity);
|
|
|
|
if (isa<InitListExpr>(IList->getInit(Index)))
|
|
CheckSubElementType(MemberEntity, IList, Field->getType(), Index,
|
|
StructuredList, StructuredIndex);
|
|
else
|
|
CheckImplicitInitList(MemberEntity, IList, Field->getType(), Index,
|
|
StructuredList, StructuredIndex);
|
|
}
|
|
|
|
/// \brief Expand a field designator that refers to a member of an
|
|
/// anonymous struct or union into a series of field designators that
|
|
/// refers to the field within the appropriate subobject.
|
|
///
|
|
static void ExpandAnonymousFieldDesignator(Sema &SemaRef,
|
|
DesignatedInitExpr *DIE,
|
|
unsigned DesigIdx,
|
|
IndirectFieldDecl *IndirectField) {
|
|
typedef DesignatedInitExpr::Designator Designator;
|
|
|
|
// Build the replacement designators.
|
|
SmallVector<Designator, 4> Replacements;
|
|
for (IndirectFieldDecl::chain_iterator PI = IndirectField->chain_begin(),
|
|
PE = IndirectField->chain_end(); PI != PE; ++PI) {
|
|
if (PI + 1 == PE)
|
|
Replacements.push_back(Designator((IdentifierInfo *)nullptr,
|
|
DIE->getDesignator(DesigIdx)->getDotLoc(),
|
|
DIE->getDesignator(DesigIdx)->getFieldLoc()));
|
|
else
|
|
Replacements.push_back(Designator((IdentifierInfo *)nullptr,
|
|
SourceLocation(), SourceLocation()));
|
|
assert(isa<FieldDecl>(*PI));
|
|
Replacements.back().setField(cast<FieldDecl>(*PI));
|
|
}
|
|
|
|
// Expand the current designator into the set of replacement
|
|
// designators, so we have a full subobject path down to where the
|
|
// member of the anonymous struct/union is actually stored.
|
|
DIE->ExpandDesignator(SemaRef.Context, DesigIdx, &Replacements[0],
|
|
&Replacements[0] + Replacements.size());
|
|
}
|
|
|
|
static DesignatedInitExpr *CloneDesignatedInitExpr(Sema &SemaRef,
|
|
DesignatedInitExpr *DIE) {
|
|
unsigned NumIndexExprs = DIE->getNumSubExprs() - 1;
|
|
SmallVector<Expr*, 4> IndexExprs(NumIndexExprs);
|
|
for (unsigned I = 0; I < NumIndexExprs; ++I)
|
|
IndexExprs[I] = DIE->getSubExpr(I + 1);
|
|
return DesignatedInitExpr::Create(SemaRef.Context, DIE->designators_begin(),
|
|
DIE->size(), IndexExprs,
|
|
DIE->getEqualOrColonLoc(),
|
|
DIE->usesGNUSyntax(), DIE->getInit());
|
|
}
|
|
|
|
namespace {
|
|
|
|
// Callback to only accept typo corrections that are for field members of
|
|
// the given struct or union.
|
|
class FieldInitializerValidatorCCC : public CorrectionCandidateCallback {
|
|
public:
|
|
explicit FieldInitializerValidatorCCC(RecordDecl *RD)
|
|
: Record(RD) {}
|
|
|
|
bool ValidateCandidate(const TypoCorrection &candidate) override {
|
|
FieldDecl *FD = candidate.getCorrectionDeclAs<FieldDecl>();
|
|
return FD && FD->getDeclContext()->getRedeclContext()->Equals(Record);
|
|
}
|
|
|
|
private:
|
|
RecordDecl *Record;
|
|
};
|
|
|
|
}
|
|
|
|
/// @brief Check the well-formedness of a C99 designated initializer.
|
|
///
|
|
/// Determines whether the designated initializer @p DIE, which
|
|
/// resides at the given @p Index within the initializer list @p
|
|
/// IList, is well-formed for a current object of type @p DeclType
|
|
/// (C99 6.7.8). The actual subobject that this designator refers to
|
|
/// within the current subobject is returned in either
|
|
/// @p NextField or @p NextElementIndex (whichever is appropriate).
|
|
///
|
|
/// @param IList The initializer list in which this designated
|
|
/// initializer occurs.
|
|
///
|
|
/// @param DIE The designated initializer expression.
|
|
///
|
|
/// @param DesigIdx The index of the current designator.
|
|
///
|
|
/// @param CurrentObjectType The type of the "current object" (C99 6.7.8p17),
|
|
/// into which the designation in @p DIE should refer.
|
|
///
|
|
/// @param NextField If non-NULL and the first designator in @p DIE is
|
|
/// a field, this will be set to the field declaration corresponding
|
|
/// to the field named by the designator.
|
|
///
|
|
/// @param NextElementIndex If non-NULL and the first designator in @p
|
|
/// DIE is an array designator or GNU array-range designator, this
|
|
/// will be set to the last index initialized by this designator.
|
|
///
|
|
/// @param Index Index into @p IList where the designated initializer
|
|
/// @p DIE occurs.
|
|
///
|
|
/// @param StructuredList The initializer list expression that
|
|
/// describes all of the subobject initializers in the order they'll
|
|
/// actually be initialized.
|
|
///
|
|
/// @returns true if there was an error, false otherwise.
|
|
bool
|
|
InitListChecker::CheckDesignatedInitializer(const InitializedEntity &Entity,
|
|
InitListExpr *IList,
|
|
DesignatedInitExpr *DIE,
|
|
unsigned DesigIdx,
|
|
QualType &CurrentObjectType,
|
|
RecordDecl::field_iterator *NextField,
|
|
llvm::APSInt *NextElementIndex,
|
|
unsigned &Index,
|
|
InitListExpr *StructuredList,
|
|
unsigned &StructuredIndex,
|
|
bool FinishSubobjectInit,
|
|
bool TopLevelObject) {
|
|
if (DesigIdx == DIE->size()) {
|
|
// Check the actual initialization for the designated object type.
|
|
bool prevHadError = hadError;
|
|
|
|
// Temporarily remove the designator expression from the
|
|
// initializer list that the child calls see, so that we don't try
|
|
// to re-process the designator.
|
|
unsigned OldIndex = Index;
|
|
IList->setInit(OldIndex, DIE->getInit());
|
|
|
|
CheckSubElementType(Entity, IList, CurrentObjectType, Index,
|
|
StructuredList, StructuredIndex);
|
|
|
|
// Restore the designated initializer expression in the syntactic
|
|
// form of the initializer list.
|
|
if (IList->getInit(OldIndex) != DIE->getInit())
|
|
DIE->setInit(IList->getInit(OldIndex));
|
|
IList->setInit(OldIndex, DIE);
|
|
|
|
return hadError && !prevHadError;
|
|
}
|
|
|
|
DesignatedInitExpr::Designator *D = DIE->getDesignator(DesigIdx);
|
|
bool IsFirstDesignator = (DesigIdx == 0);
|
|
if (!VerifyOnly) {
|
|
assert((IsFirstDesignator || StructuredList) &&
|
|
"Need a non-designated initializer list to start from");
|
|
|
|
// Determine the structural initializer list that corresponds to the
|
|
// current subobject.
|
|
StructuredList = IsFirstDesignator? SyntacticToSemantic.lookup(IList)
|
|
: getStructuredSubobjectInit(IList, Index, CurrentObjectType,
|
|
StructuredList, StructuredIndex,
|
|
SourceRange(D->getLocStart(),
|
|
DIE->getLocEnd()));
|
|
assert(StructuredList && "Expected a structured initializer list");
|
|
}
|
|
|
|
if (D->isFieldDesignator()) {
|
|
// C99 6.7.8p7:
|
|
//
|
|
// If a designator has the form
|
|
//
|
|
// . identifier
|
|
//
|
|
// then the current object (defined below) shall have
|
|
// structure or union type and the identifier shall be the
|
|
// name of a member of that type.
|
|
const RecordType *RT = CurrentObjectType->getAs<RecordType>();
|
|
if (!RT) {
|
|
SourceLocation Loc = D->getDotLoc();
|
|
if (Loc.isInvalid())
|
|
Loc = D->getFieldLoc();
|
|
if (!VerifyOnly)
|
|
SemaRef.Diag(Loc, diag::err_field_designator_non_aggr)
|
|
<< SemaRef.getLangOpts().CPlusPlus << CurrentObjectType;
|
|
++Index;
|
|
return true;
|
|
}
|
|
|
|
FieldDecl *KnownField = D->getField();
|
|
if (!KnownField) {
|
|
IdentifierInfo *FieldName = D->getFieldName();
|
|
DeclContext::lookup_result Lookup = RT->getDecl()->lookup(FieldName);
|
|
for (NamedDecl *ND : Lookup) {
|
|
if (auto *FD = dyn_cast<FieldDecl>(ND)) {
|
|
KnownField = FD;
|
|
break;
|
|
}
|
|
if (auto *IFD = dyn_cast<IndirectFieldDecl>(ND)) {
|
|
// In verify mode, don't modify the original.
|
|
if (VerifyOnly)
|
|
DIE = CloneDesignatedInitExpr(SemaRef, DIE);
|
|
ExpandAnonymousFieldDesignator(SemaRef, DIE, DesigIdx, IFD);
|
|
D = DIE->getDesignator(DesigIdx);
|
|
KnownField = cast<FieldDecl>(*IFD->chain_begin());
|
|
break;
|
|
}
|
|
}
|
|
if (!KnownField) {
|
|
if (VerifyOnly) {
|
|
++Index;
|
|
return true; // No typo correction when just trying this out.
|
|
}
|
|
|
|
// Name lookup found something, but it wasn't a field.
|
|
if (!Lookup.empty()) {
|
|
SemaRef.Diag(D->getFieldLoc(), diag::err_field_designator_nonfield)
|
|
<< FieldName;
|
|
SemaRef.Diag(Lookup.front()->getLocation(),
|
|
diag::note_field_designator_found);
|
|
++Index;
|
|
return true;
|
|
}
|
|
|
|
// Name lookup didn't find anything.
|
|
// Determine whether this was a typo for another field name.
|
|
if (TypoCorrection Corrected = SemaRef.CorrectTypo(
|
|
DeclarationNameInfo(FieldName, D->getFieldLoc()),
|
|
Sema::LookupMemberName, /*Scope=*/nullptr, /*SS=*/nullptr,
|
|
llvm::make_unique<FieldInitializerValidatorCCC>(RT->getDecl()),
|
|
Sema::CTK_ErrorRecovery, RT->getDecl())) {
|
|
SemaRef.diagnoseTypo(
|
|
Corrected,
|
|
SemaRef.PDiag(diag::err_field_designator_unknown_suggest)
|
|
<< FieldName << CurrentObjectType);
|
|
KnownField = Corrected.getCorrectionDeclAs<FieldDecl>();
|
|
hadError = true;
|
|
} else {
|
|
// Typo correction didn't find anything.
|
|
SemaRef.Diag(D->getFieldLoc(), diag::err_field_designator_unknown)
|
|
<< FieldName << CurrentObjectType;
|
|
++Index;
|
|
return true;
|
|
}
|
|
}
|
|
}
|
|
|
|
unsigned FieldIndex = 0;
|
|
for (auto *FI : RT->getDecl()->fields()) {
|
|
if (FI->isUnnamedBitfield())
|
|
continue;
|
|
if (KnownField == FI)
|
|
break;
|
|
++FieldIndex;
|
|
}
|
|
|
|
RecordDecl::field_iterator Field =
|
|
RecordDecl::field_iterator(DeclContext::decl_iterator(KnownField));
|
|
|
|
// All of the fields of a union are located at the same place in
|
|
// the initializer list.
|
|
if (RT->getDecl()->isUnion()) {
|
|
FieldIndex = 0;
|
|
if (!VerifyOnly) {
|
|
FieldDecl *CurrentField = StructuredList->getInitializedFieldInUnion();
|
|
if (CurrentField && CurrentField != *Field) {
|
|
assert(StructuredList->getNumInits() == 1
|
|
&& "A union should never have more than one initializer!");
|
|
|
|
// we're about to throw away an initializer, emit warning
|
|
SemaRef.Diag(D->getFieldLoc(),
|
|
diag::warn_initializer_overrides)
|
|
<< D->getSourceRange();
|
|
Expr *ExistingInit = StructuredList->getInit(0);
|
|
SemaRef.Diag(ExistingInit->getLocStart(),
|
|
diag::note_previous_initializer)
|
|
<< /*FIXME:has side effects=*/0
|
|
<< ExistingInit->getSourceRange();
|
|
|
|
// remove existing initializer
|
|
StructuredList->resizeInits(SemaRef.Context, 0);
|
|
StructuredList->setInitializedFieldInUnion(nullptr);
|
|
}
|
|
|
|
StructuredList->setInitializedFieldInUnion(*Field);
|
|
}
|
|
}
|
|
|
|
// Make sure we can use this declaration.
|
|
bool InvalidUse;
|
|
if (VerifyOnly)
|
|
InvalidUse = !SemaRef.CanUseDecl(*Field);
|
|
else
|
|
InvalidUse = SemaRef.DiagnoseUseOfDecl(*Field, D->getFieldLoc());
|
|
if (InvalidUse) {
|
|
++Index;
|
|
return true;
|
|
}
|
|
|
|
if (!VerifyOnly) {
|
|
// Update the designator with the field declaration.
|
|
D->setField(*Field);
|
|
|
|
// Make sure that our non-designated initializer list has space
|
|
// for a subobject corresponding to this field.
|
|
if (FieldIndex >= StructuredList->getNumInits())
|
|
StructuredList->resizeInits(SemaRef.Context, FieldIndex + 1);
|
|
}
|
|
|
|
// This designator names a flexible array member.
|
|
if (Field->getType()->isIncompleteArrayType()) {
|
|
bool Invalid = false;
|
|
if ((DesigIdx + 1) != DIE->size()) {
|
|
// We can't designate an object within the flexible array
|
|
// member (because GCC doesn't allow it).
|
|
if (!VerifyOnly) {
|
|
DesignatedInitExpr::Designator *NextD
|
|
= DIE->getDesignator(DesigIdx + 1);
|
|
SemaRef.Diag(NextD->getLocStart(),
|
|
diag::err_designator_into_flexible_array_member)
|
|
<< SourceRange(NextD->getLocStart(),
|
|
DIE->getLocEnd());
|
|
SemaRef.Diag(Field->getLocation(), diag::note_flexible_array_member)
|
|
<< *Field;
|
|
}
|
|
Invalid = true;
|
|
}
|
|
|
|
if (!hadError && !isa<InitListExpr>(DIE->getInit()) &&
|
|
!isa<StringLiteral>(DIE->getInit())) {
|
|
// The initializer is not an initializer list.
|
|
if (!VerifyOnly) {
|
|
SemaRef.Diag(DIE->getInit()->getLocStart(),
|
|
diag::err_flexible_array_init_needs_braces)
|
|
<< DIE->getInit()->getSourceRange();
|
|
SemaRef.Diag(Field->getLocation(), diag::note_flexible_array_member)
|
|
<< *Field;
|
|
}
|
|
Invalid = true;
|
|
}
|
|
|
|
// Check GNU flexible array initializer.
|
|
if (!Invalid && CheckFlexibleArrayInit(Entity, DIE->getInit(), *Field,
|
|
TopLevelObject))
|
|
Invalid = true;
|
|
|
|
if (Invalid) {
|
|
++Index;
|
|
return true;
|
|
}
|
|
|
|
// Initialize the array.
|
|
bool prevHadError = hadError;
|
|
unsigned newStructuredIndex = FieldIndex;
|
|
unsigned OldIndex = Index;
|
|
IList->setInit(Index, DIE->getInit());
|
|
|
|
InitializedEntity MemberEntity =
|
|
InitializedEntity::InitializeMember(*Field, &Entity);
|
|
CheckSubElementType(MemberEntity, IList, Field->getType(), Index,
|
|
StructuredList, newStructuredIndex);
|
|
|
|
IList->setInit(OldIndex, DIE);
|
|
if (hadError && !prevHadError) {
|
|
++Field;
|
|
++FieldIndex;
|
|
if (NextField)
|
|
*NextField = Field;
|
|
StructuredIndex = FieldIndex;
|
|
return true;
|
|
}
|
|
} else {
|
|
// Recurse to check later designated subobjects.
|
|
QualType FieldType = Field->getType();
|
|
unsigned newStructuredIndex = FieldIndex;
|
|
|
|
InitializedEntity MemberEntity =
|
|
InitializedEntity::InitializeMember(*Field, &Entity);
|
|
if (CheckDesignatedInitializer(MemberEntity, IList, DIE, DesigIdx + 1,
|
|
FieldType, nullptr, nullptr, Index,
|
|
StructuredList, newStructuredIndex,
|
|
true, false))
|
|
return true;
|
|
}
|
|
|
|
// Find the position of the next field to be initialized in this
|
|
// subobject.
|
|
++Field;
|
|
++FieldIndex;
|
|
|
|
// If this the first designator, our caller will continue checking
|
|
// the rest of this struct/class/union subobject.
|
|
if (IsFirstDesignator) {
|
|
if (NextField)
|
|
*NextField = Field;
|
|
StructuredIndex = FieldIndex;
|
|
return false;
|
|
}
|
|
|
|
if (!FinishSubobjectInit)
|
|
return false;
|
|
|
|
// We've already initialized something in the union; we're done.
|
|
if (RT->getDecl()->isUnion())
|
|
return hadError;
|
|
|
|
// Check the remaining fields within this class/struct/union subobject.
|
|
bool prevHadError = hadError;
|
|
|
|
CheckStructUnionTypes(Entity, IList, CurrentObjectType, Field, false, Index,
|
|
StructuredList, FieldIndex);
|
|
return hadError && !prevHadError;
|
|
}
|
|
|
|
// C99 6.7.8p6:
|
|
//
|
|
// If a designator has the form
|
|
//
|
|
// [ constant-expression ]
|
|
//
|
|
// then the current object (defined below) shall have array
|
|
// type and the expression shall be an integer constant
|
|
// expression. If the array is of unknown size, any
|
|
// nonnegative value is valid.
|
|
//
|
|
// Additionally, cope with the GNU extension that permits
|
|
// designators of the form
|
|
//
|
|
// [ constant-expression ... constant-expression ]
|
|
const ArrayType *AT = SemaRef.Context.getAsArrayType(CurrentObjectType);
|
|
if (!AT) {
|
|
if (!VerifyOnly)
|
|
SemaRef.Diag(D->getLBracketLoc(), diag::err_array_designator_non_array)
|
|
<< CurrentObjectType;
|
|
++Index;
|
|
return true;
|
|
}
|
|
|
|
Expr *IndexExpr = nullptr;
|
|
llvm::APSInt DesignatedStartIndex, DesignatedEndIndex;
|
|
if (D->isArrayDesignator()) {
|
|
IndexExpr = DIE->getArrayIndex(*D);
|
|
DesignatedStartIndex = IndexExpr->EvaluateKnownConstInt(SemaRef.Context);
|
|
DesignatedEndIndex = DesignatedStartIndex;
|
|
} else {
|
|
assert(D->isArrayRangeDesignator() && "Need array-range designator");
|
|
|
|
DesignatedStartIndex =
|
|
DIE->getArrayRangeStart(*D)->EvaluateKnownConstInt(SemaRef.Context);
|
|
DesignatedEndIndex =
|
|
DIE->getArrayRangeEnd(*D)->EvaluateKnownConstInt(SemaRef.Context);
|
|
IndexExpr = DIE->getArrayRangeEnd(*D);
|
|
|
|
// Codegen can't handle evaluating array range designators that have side
|
|
// effects, because we replicate the AST value for each initialized element.
|
|
// As such, set the sawArrayRangeDesignator() bit if we initialize multiple
|
|
// elements with something that has a side effect, so codegen can emit an
|
|
// "error unsupported" error instead of miscompiling the app.
|
|
if (DesignatedStartIndex.getZExtValue()!=DesignatedEndIndex.getZExtValue()&&
|
|
DIE->getInit()->HasSideEffects(SemaRef.Context) && !VerifyOnly)
|
|
FullyStructuredList->sawArrayRangeDesignator();
|
|
}
|
|
|
|
if (isa<ConstantArrayType>(AT)) {
|
|
llvm::APSInt MaxElements(cast<ConstantArrayType>(AT)->getSize(), false);
|
|
DesignatedStartIndex
|
|
= DesignatedStartIndex.extOrTrunc(MaxElements.getBitWidth());
|
|
DesignatedStartIndex.setIsUnsigned(MaxElements.isUnsigned());
|
|
DesignatedEndIndex
|
|
= DesignatedEndIndex.extOrTrunc(MaxElements.getBitWidth());
|
|
DesignatedEndIndex.setIsUnsigned(MaxElements.isUnsigned());
|
|
if (DesignatedEndIndex >= MaxElements) {
|
|
if (!VerifyOnly)
|
|
SemaRef.Diag(IndexExpr->getLocStart(),
|
|
diag::err_array_designator_too_large)
|
|
<< DesignatedEndIndex.toString(10) << MaxElements.toString(10)
|
|
<< IndexExpr->getSourceRange();
|
|
++Index;
|
|
return true;
|
|
}
|
|
} else {
|
|
// Make sure the bit-widths and signedness match.
|
|
if (DesignatedStartIndex.getBitWidth() > DesignatedEndIndex.getBitWidth())
|
|
DesignatedEndIndex
|
|
= DesignatedEndIndex.extend(DesignatedStartIndex.getBitWidth());
|
|
else if (DesignatedStartIndex.getBitWidth() <
|
|
DesignatedEndIndex.getBitWidth())
|
|
DesignatedStartIndex
|
|
= DesignatedStartIndex.extend(DesignatedEndIndex.getBitWidth());
|
|
DesignatedStartIndex.setIsUnsigned(true);
|
|
DesignatedEndIndex.setIsUnsigned(true);
|
|
}
|
|
|
|
if (!VerifyOnly && StructuredList->isStringLiteralInit()) {
|
|
// We're modifying a string literal init; we have to decompose the string
|
|
// so we can modify the individual characters.
|
|
ASTContext &Context = SemaRef.Context;
|
|
Expr *SubExpr = StructuredList->getInit(0)->IgnoreParens();
|
|
|
|
// Compute the character type
|
|
QualType CharTy = AT->getElementType();
|
|
|
|
// Compute the type of the integer literals.
|
|
QualType PromotedCharTy = CharTy;
|
|
if (CharTy->isPromotableIntegerType())
|
|
PromotedCharTy = Context.getPromotedIntegerType(CharTy);
|
|
unsigned PromotedCharTyWidth = Context.getTypeSize(PromotedCharTy);
|
|
|
|
if (StringLiteral *SL = dyn_cast<StringLiteral>(SubExpr)) {
|
|
// Get the length of the string.
|
|
uint64_t StrLen = SL->getLength();
|
|
if (cast<ConstantArrayType>(AT)->getSize().ult(StrLen))
|
|
StrLen = cast<ConstantArrayType>(AT)->getSize().getZExtValue();
|
|
StructuredList->resizeInits(Context, StrLen);
|
|
|
|
// Build a literal for each character in the string, and put them into
|
|
// the init list.
|
|
for (unsigned i = 0, e = StrLen; i != e; ++i) {
|
|
llvm::APInt CodeUnit(PromotedCharTyWidth, SL->getCodeUnit(i));
|
|
Expr *Init = new (Context) IntegerLiteral(
|
|
Context, CodeUnit, PromotedCharTy, SubExpr->getExprLoc());
|
|
if (CharTy != PromotedCharTy)
|
|
Init = ImplicitCastExpr::Create(Context, CharTy, CK_IntegralCast,
|
|
Init, nullptr, VK_RValue);
|
|
StructuredList->updateInit(Context, i, Init);
|
|
}
|
|
} else {
|
|
ObjCEncodeExpr *E = cast<ObjCEncodeExpr>(SubExpr);
|
|
std::string Str;
|
|
Context.getObjCEncodingForType(E->getEncodedType(), Str);
|
|
|
|
// Get the length of the string.
|
|
uint64_t StrLen = Str.size();
|
|
if (cast<ConstantArrayType>(AT)->getSize().ult(StrLen))
|
|
StrLen = cast<ConstantArrayType>(AT)->getSize().getZExtValue();
|
|
StructuredList->resizeInits(Context, StrLen);
|
|
|
|
// Build a literal for each character in the string, and put them into
|
|
// the init list.
|
|
for (unsigned i = 0, e = StrLen; i != e; ++i) {
|
|
llvm::APInt CodeUnit(PromotedCharTyWidth, Str[i]);
|
|
Expr *Init = new (Context) IntegerLiteral(
|
|
Context, CodeUnit, PromotedCharTy, SubExpr->getExprLoc());
|
|
if (CharTy != PromotedCharTy)
|
|
Init = ImplicitCastExpr::Create(Context, CharTy, CK_IntegralCast,
|
|
Init, nullptr, VK_RValue);
|
|
StructuredList->updateInit(Context, i, Init);
|
|
}
|
|
}
|
|
}
|
|
|
|
// Make sure that our non-designated initializer list has space
|
|
// for a subobject corresponding to this array element.
|
|
if (!VerifyOnly &&
|
|
DesignatedEndIndex.getZExtValue() >= StructuredList->getNumInits())
|
|
StructuredList->resizeInits(SemaRef.Context,
|
|
DesignatedEndIndex.getZExtValue() + 1);
|
|
|
|
// Repeatedly perform subobject initializations in the range
|
|
// [DesignatedStartIndex, DesignatedEndIndex].
|
|
|
|
// Move to the next designator
|
|
unsigned ElementIndex = DesignatedStartIndex.getZExtValue();
|
|
unsigned OldIndex = Index;
|
|
|
|
InitializedEntity ElementEntity =
|
|
InitializedEntity::InitializeElement(SemaRef.Context, 0, Entity);
|
|
|
|
while (DesignatedStartIndex <= DesignatedEndIndex) {
|
|
// Recurse to check later designated subobjects.
|
|
QualType ElementType = AT->getElementType();
|
|
Index = OldIndex;
|
|
|
|
ElementEntity.setElementIndex(ElementIndex);
|
|
if (CheckDesignatedInitializer(ElementEntity, IList, DIE, DesigIdx + 1,
|
|
ElementType, nullptr, nullptr, Index,
|
|
StructuredList, ElementIndex,
|
|
(DesignatedStartIndex == DesignatedEndIndex),
|
|
false))
|
|
return true;
|
|
|
|
// Move to the next index in the array that we'll be initializing.
|
|
++DesignatedStartIndex;
|
|
ElementIndex = DesignatedStartIndex.getZExtValue();
|
|
}
|
|
|
|
// If this the first designator, our caller will continue checking
|
|
// the rest of this array subobject.
|
|
if (IsFirstDesignator) {
|
|
if (NextElementIndex)
|
|
*NextElementIndex = DesignatedStartIndex;
|
|
StructuredIndex = ElementIndex;
|
|
return false;
|
|
}
|
|
|
|
if (!FinishSubobjectInit)
|
|
return false;
|
|
|
|
// Check the remaining elements within this array subobject.
|
|
bool prevHadError = hadError;
|
|
CheckArrayType(Entity, IList, CurrentObjectType, DesignatedStartIndex,
|
|
/*SubobjectIsDesignatorContext=*/false, Index,
|
|
StructuredList, ElementIndex);
|
|
return hadError && !prevHadError;
|
|
}
|
|
|
|
// Get the structured initializer list for a subobject of type
|
|
// @p CurrentObjectType.
|
|
InitListExpr *
|
|
InitListChecker::getStructuredSubobjectInit(InitListExpr *IList, unsigned Index,
|
|
QualType CurrentObjectType,
|
|
InitListExpr *StructuredList,
|
|
unsigned StructuredIndex,
|
|
SourceRange InitRange) {
|
|
if (VerifyOnly)
|
|
return nullptr; // No structured list in verification-only mode.
|
|
Expr *ExistingInit = nullptr;
|
|
if (!StructuredList)
|
|
ExistingInit = SyntacticToSemantic.lookup(IList);
|
|
else if (StructuredIndex < StructuredList->getNumInits())
|
|
ExistingInit = StructuredList->getInit(StructuredIndex);
|
|
|
|
if (InitListExpr *Result = dyn_cast_or_null<InitListExpr>(ExistingInit))
|
|
return Result;
|
|
|
|
if (ExistingInit) {
|
|
// We are creating an initializer list that initializes the
|
|
// subobjects of the current object, but there was already an
|
|
// initialization that completely initialized the current
|
|
// subobject, e.g., by a compound literal:
|
|
//
|
|
// struct X { int a, b; };
|
|
// struct X xs[] = { [0] = (struct X) { 1, 2 }, [0].b = 3 };
|
|
//
|
|
// Here, xs[0].a == 0 and xs[0].b == 3, since the second,
|
|
// designated initializer re-initializes the whole
|
|
// subobject [0], overwriting previous initializers.
|
|
SemaRef.Diag(InitRange.getBegin(),
|
|
diag::warn_subobject_initializer_overrides)
|
|
<< InitRange;
|
|
SemaRef.Diag(ExistingInit->getLocStart(),
|
|
diag::note_previous_initializer)
|
|
<< /*FIXME:has side effects=*/0
|
|
<< ExistingInit->getSourceRange();
|
|
}
|
|
|
|
InitListExpr *Result
|
|
= new (SemaRef.Context) InitListExpr(SemaRef.Context,
|
|
InitRange.getBegin(), None,
|
|
InitRange.getEnd());
|
|
|
|
QualType ResultType = CurrentObjectType;
|
|
if (!ResultType->isArrayType())
|
|
ResultType = ResultType.getNonLValueExprType(SemaRef.Context);
|
|
Result->setType(ResultType);
|
|
|
|
// Pre-allocate storage for the structured initializer list.
|
|
unsigned NumElements = 0;
|
|
unsigned NumInits = 0;
|
|
bool GotNumInits = false;
|
|
if (!StructuredList) {
|
|
NumInits = IList->getNumInits();
|
|
GotNumInits = true;
|
|
} else if (Index < IList->getNumInits()) {
|
|
if (InitListExpr *SubList = dyn_cast<InitListExpr>(IList->getInit(Index))) {
|
|
NumInits = SubList->getNumInits();
|
|
GotNumInits = true;
|
|
}
|
|
}
|
|
|
|
if (const ArrayType *AType
|
|
= SemaRef.Context.getAsArrayType(CurrentObjectType)) {
|
|
if (const ConstantArrayType *CAType = dyn_cast<ConstantArrayType>(AType)) {
|
|
NumElements = CAType->getSize().getZExtValue();
|
|
// Simple heuristic so that we don't allocate a very large
|
|
// initializer with many empty entries at the end.
|
|
if (GotNumInits && NumElements > NumInits)
|
|
NumElements = 0;
|
|
}
|
|
} else if (const VectorType *VType = CurrentObjectType->getAs<VectorType>())
|
|
NumElements = VType->getNumElements();
|
|
else if (const RecordType *RType = CurrentObjectType->getAs<RecordType>()) {
|
|
RecordDecl *RDecl = RType->getDecl();
|
|
if (RDecl->isUnion())
|
|
NumElements = 1;
|
|
else
|
|
NumElements = std::distance(RDecl->field_begin(), RDecl->field_end());
|
|
}
|
|
|
|
Result->reserveInits(SemaRef.Context, NumElements);
|
|
|
|
// Link this new initializer list into the structured initializer
|
|
// lists.
|
|
if (StructuredList)
|
|
StructuredList->updateInit(SemaRef.Context, StructuredIndex, Result);
|
|
else {
|
|
Result->setSyntacticForm(IList);
|
|
SyntacticToSemantic[IList] = Result;
|
|
}
|
|
|
|
return Result;
|
|
}
|
|
|
|
/// Update the initializer at index @p StructuredIndex within the
|
|
/// structured initializer list to the value @p expr.
|
|
void InitListChecker::UpdateStructuredListElement(InitListExpr *StructuredList,
|
|
unsigned &StructuredIndex,
|
|
Expr *expr) {
|
|
// No structured initializer list to update
|
|
if (!StructuredList)
|
|
return;
|
|
|
|
if (Expr *PrevInit = StructuredList->updateInit(SemaRef.Context,
|
|
StructuredIndex, expr)) {
|
|
// This initializer overwrites a previous initializer. Warn.
|
|
SemaRef.Diag(expr->getLocStart(),
|
|
diag::warn_initializer_overrides)
|
|
<< expr->getSourceRange();
|
|
SemaRef.Diag(PrevInit->getLocStart(),
|
|
diag::note_previous_initializer)
|
|
<< /*FIXME:has side effects=*/0
|
|
<< PrevInit->getSourceRange();
|
|
}
|
|
|
|
++StructuredIndex;
|
|
}
|
|
|
|
/// Check that the given Index expression is a valid array designator
|
|
/// value. This is essentially just a wrapper around
|
|
/// VerifyIntegerConstantExpression that also checks for negative values
|
|
/// and produces a reasonable diagnostic if there is a
|
|
/// failure. Returns the index expression, possibly with an implicit cast
|
|
/// added, on success. If everything went okay, Value will receive the
|
|
/// value of the constant expression.
|
|
static ExprResult
|
|
CheckArrayDesignatorExpr(Sema &S, Expr *Index, llvm::APSInt &Value) {
|
|
SourceLocation Loc = Index->getLocStart();
|
|
|
|
// Make sure this is an integer constant expression.
|
|
ExprResult Result = S.VerifyIntegerConstantExpression(Index, &Value);
|
|
if (Result.isInvalid())
|
|
return Result;
|
|
|
|
if (Value.isSigned() && Value.isNegative())
|
|
return S.Diag(Loc, diag::err_array_designator_negative)
|
|
<< Value.toString(10) << Index->getSourceRange();
|
|
|
|
Value.setIsUnsigned(true);
|
|
return Result;
|
|
}
|
|
|
|
ExprResult Sema::ActOnDesignatedInitializer(Designation &Desig,
|
|
SourceLocation Loc,
|
|
bool GNUSyntax,
|
|
ExprResult Init) {
|
|
typedef DesignatedInitExpr::Designator ASTDesignator;
|
|
|
|
bool Invalid = false;
|
|
SmallVector<ASTDesignator, 32> Designators;
|
|
SmallVector<Expr *, 32> InitExpressions;
|
|
|
|
// Build designators and check array designator expressions.
|
|
for (unsigned Idx = 0; Idx < Desig.getNumDesignators(); ++Idx) {
|
|
const Designator &D = Desig.getDesignator(Idx);
|
|
switch (D.getKind()) {
|
|
case Designator::FieldDesignator:
|
|
Designators.push_back(ASTDesignator(D.getField(), D.getDotLoc(),
|
|
D.getFieldLoc()));
|
|
break;
|
|
|
|
case Designator::ArrayDesignator: {
|
|
Expr *Index = static_cast<Expr *>(D.getArrayIndex());
|
|
llvm::APSInt IndexValue;
|
|
if (!Index->isTypeDependent() && !Index->isValueDependent())
|
|
Index = CheckArrayDesignatorExpr(*this, Index, IndexValue).get();
|
|
if (!Index)
|
|
Invalid = true;
|
|
else {
|
|
Designators.push_back(ASTDesignator(InitExpressions.size(),
|
|
D.getLBracketLoc(),
|
|
D.getRBracketLoc()));
|
|
InitExpressions.push_back(Index);
|
|
}
|
|
break;
|
|
}
|
|
|
|
case Designator::ArrayRangeDesignator: {
|
|
Expr *StartIndex = static_cast<Expr *>(D.getArrayRangeStart());
|
|
Expr *EndIndex = static_cast<Expr *>(D.getArrayRangeEnd());
|
|
llvm::APSInt StartValue;
|
|
llvm::APSInt EndValue;
|
|
bool StartDependent = StartIndex->isTypeDependent() ||
|
|
StartIndex->isValueDependent();
|
|
bool EndDependent = EndIndex->isTypeDependent() ||
|
|
EndIndex->isValueDependent();
|
|
if (!StartDependent)
|
|
StartIndex =
|
|
CheckArrayDesignatorExpr(*this, StartIndex, StartValue).get();
|
|
if (!EndDependent)
|
|
EndIndex = CheckArrayDesignatorExpr(*this, EndIndex, EndValue).get();
|
|
|
|
if (!StartIndex || !EndIndex)
|
|
Invalid = true;
|
|
else {
|
|
// Make sure we're comparing values with the same bit width.
|
|
if (StartDependent || EndDependent) {
|
|
// Nothing to compute.
|
|
} else if (StartValue.getBitWidth() > EndValue.getBitWidth())
|
|
EndValue = EndValue.extend(StartValue.getBitWidth());
|
|
else if (StartValue.getBitWidth() < EndValue.getBitWidth())
|
|
StartValue = StartValue.extend(EndValue.getBitWidth());
|
|
|
|
if (!StartDependent && !EndDependent && EndValue < StartValue) {
|
|
Diag(D.getEllipsisLoc(), diag::err_array_designator_empty_range)
|
|
<< StartValue.toString(10) << EndValue.toString(10)
|
|
<< StartIndex->getSourceRange() << EndIndex->getSourceRange();
|
|
Invalid = true;
|
|
} else {
|
|
Designators.push_back(ASTDesignator(InitExpressions.size(),
|
|
D.getLBracketLoc(),
|
|
D.getEllipsisLoc(),
|
|
D.getRBracketLoc()));
|
|
InitExpressions.push_back(StartIndex);
|
|
InitExpressions.push_back(EndIndex);
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (Invalid || Init.isInvalid())
|
|
return ExprError();
|
|
|
|
// Clear out the expressions within the designation.
|
|
Desig.ClearExprs(*this);
|
|
|
|
DesignatedInitExpr *DIE
|
|
= DesignatedInitExpr::Create(Context,
|
|
Designators.data(), Designators.size(),
|
|
InitExpressions, Loc, GNUSyntax,
|
|
Init.getAs<Expr>());
|
|
|
|
if (!getLangOpts().C99)
|
|
Diag(DIE->getLocStart(), diag::ext_designated_init)
|
|
<< DIE->getSourceRange();
|
|
|
|
return DIE;
|
|
}
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// Initialization entity
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
InitializedEntity::InitializedEntity(ASTContext &Context, unsigned Index,
|
|
const InitializedEntity &Parent)
|
|
: Parent(&Parent), Index(Index)
|
|
{
|
|
if (const ArrayType *AT = Context.getAsArrayType(Parent.getType())) {
|
|
Kind = EK_ArrayElement;
|
|
Type = AT->getElementType();
|
|
} else if (const VectorType *VT = Parent.getType()->getAs<VectorType>()) {
|
|
Kind = EK_VectorElement;
|
|
Type = VT->getElementType();
|
|
} else {
|
|
const ComplexType *CT = Parent.getType()->getAs<ComplexType>();
|
|
assert(CT && "Unexpected type");
|
|
Kind = EK_ComplexElement;
|
|
Type = CT->getElementType();
|
|
}
|
|
}
|
|
|
|
InitializedEntity
|
|
InitializedEntity::InitializeBase(ASTContext &Context,
|
|
const CXXBaseSpecifier *Base,
|
|
bool IsInheritedVirtualBase) {
|
|
InitializedEntity Result;
|
|
Result.Kind = EK_Base;
|
|
Result.Parent = nullptr;
|
|
Result.Base = reinterpret_cast<uintptr_t>(Base);
|
|
if (IsInheritedVirtualBase)
|
|
Result.Base |= 0x01;
|
|
|
|
Result.Type = Base->getType();
|
|
return Result;
|
|
}
|
|
|
|
DeclarationName InitializedEntity::getName() const {
|
|
switch (getKind()) {
|
|
case EK_Parameter:
|
|
case EK_Parameter_CF_Audited: {
|
|
ParmVarDecl *D = reinterpret_cast<ParmVarDecl*>(Parameter & ~0x1);
|
|
return (D ? D->getDeclName() : DeclarationName());
|
|
}
|
|
|
|
case EK_Variable:
|
|
case EK_Member:
|
|
return VariableOrMember->getDeclName();
|
|
|
|
case EK_LambdaCapture:
|
|
return DeclarationName(Capture.VarID);
|
|
|
|
case EK_Result:
|
|
case EK_Exception:
|
|
case EK_New:
|
|
case EK_Temporary:
|
|
case EK_Base:
|
|
case EK_Delegating:
|
|
case EK_ArrayElement:
|
|
case EK_VectorElement:
|
|
case EK_ComplexElement:
|
|
case EK_BlockElement:
|
|
case EK_CompoundLiteralInit:
|
|
case EK_RelatedResult:
|
|
return DeclarationName();
|
|
}
|
|
|
|
llvm_unreachable("Invalid EntityKind!");
|
|
}
|
|
|
|
DeclaratorDecl *InitializedEntity::getDecl() const {
|
|
switch (getKind()) {
|
|
case EK_Variable:
|
|
case EK_Member:
|
|
return VariableOrMember;
|
|
|
|
case EK_Parameter:
|
|
case EK_Parameter_CF_Audited:
|
|
return reinterpret_cast<ParmVarDecl*>(Parameter & ~0x1);
|
|
|
|
case EK_Result:
|
|
case EK_Exception:
|
|
case EK_New:
|
|
case EK_Temporary:
|
|
case EK_Base:
|
|
case EK_Delegating:
|
|
case EK_ArrayElement:
|
|
case EK_VectorElement:
|
|
case EK_ComplexElement:
|
|
case EK_BlockElement:
|
|
case EK_LambdaCapture:
|
|
case EK_CompoundLiteralInit:
|
|
case EK_RelatedResult:
|
|
return nullptr;
|
|
}
|
|
|
|
llvm_unreachable("Invalid EntityKind!");
|
|
}
|
|
|
|
bool InitializedEntity::allowsNRVO() const {
|
|
switch (getKind()) {
|
|
case EK_Result:
|
|
case EK_Exception:
|
|
return LocAndNRVO.NRVO;
|
|
|
|
case EK_Variable:
|
|
case EK_Parameter:
|
|
case EK_Parameter_CF_Audited:
|
|
case EK_Member:
|
|
case EK_New:
|
|
case EK_Temporary:
|
|
case EK_CompoundLiteralInit:
|
|
case EK_Base:
|
|
case EK_Delegating:
|
|
case EK_ArrayElement:
|
|
case EK_VectorElement:
|
|
case EK_ComplexElement:
|
|
case EK_BlockElement:
|
|
case EK_LambdaCapture:
|
|
case EK_RelatedResult:
|
|
break;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
unsigned InitializedEntity::dumpImpl(raw_ostream &OS) const {
|
|
assert(getParent() != this);
|
|
unsigned Depth = getParent() ? getParent()->dumpImpl(OS) : 0;
|
|
for (unsigned I = 0; I != Depth; ++I)
|
|
OS << "`-";
|
|
|
|
switch (getKind()) {
|
|
case EK_Variable: OS << "Variable"; break;
|
|
case EK_Parameter: OS << "Parameter"; break;
|
|
case EK_Parameter_CF_Audited: OS << "CF audited function Parameter";
|
|
break;
|
|
case EK_Result: OS << "Result"; break;
|
|
case EK_Exception: OS << "Exception"; break;
|
|
case EK_Member: OS << "Member"; break;
|
|
case EK_New: OS << "New"; break;
|
|
case EK_Temporary: OS << "Temporary"; break;
|
|
case EK_CompoundLiteralInit: OS << "CompoundLiteral";break;
|
|
case EK_RelatedResult: OS << "RelatedResult"; break;
|
|
case EK_Base: OS << "Base"; break;
|
|
case EK_Delegating: OS << "Delegating"; break;
|
|
case EK_ArrayElement: OS << "ArrayElement " << Index; break;
|
|
case EK_VectorElement: OS << "VectorElement " << Index; break;
|
|
case EK_ComplexElement: OS << "ComplexElement " << Index; break;
|
|
case EK_BlockElement: OS << "Block"; break;
|
|
case EK_LambdaCapture:
|
|
OS << "LambdaCapture ";
|
|
OS << DeclarationName(Capture.VarID);
|
|
break;
|
|
}
|
|
|
|
if (Decl *D = getDecl()) {
|
|
OS << " ";
|
|
cast<NamedDecl>(D)->printQualifiedName(OS);
|
|
}
|
|
|
|
OS << " '" << getType().getAsString() << "'\n";
|
|
|
|
return Depth + 1;
|
|
}
|
|
|
|
void InitializedEntity::dump() const {
|
|
dumpImpl(llvm::errs());
|
|
}
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// Initialization sequence
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
void InitializationSequence::Step::Destroy() {
|
|
switch (Kind) {
|
|
case SK_ResolveAddressOfOverloadedFunction:
|
|
case SK_CastDerivedToBaseRValue:
|
|
case SK_CastDerivedToBaseXValue:
|
|
case SK_CastDerivedToBaseLValue:
|
|
case SK_BindReference:
|
|
case SK_BindReferenceToTemporary:
|
|
case SK_ExtraneousCopyToTemporary:
|
|
case SK_UserConversion:
|
|
case SK_QualificationConversionRValue:
|
|
case SK_QualificationConversionXValue:
|
|
case SK_QualificationConversionLValue:
|
|
case SK_AtomicConversion:
|
|
case SK_LValueToRValue:
|
|
case SK_ListInitialization:
|
|
case SK_UnwrapInitList:
|
|
case SK_RewrapInitList:
|
|
case SK_ConstructorInitialization:
|
|
case SK_ConstructorInitializationFromList:
|
|
case SK_ZeroInitialization:
|
|
case SK_CAssignment:
|
|
case SK_StringInit:
|
|
case SK_ObjCObjectConversion:
|
|
case SK_ArrayInit:
|
|
case SK_ParenthesizedArrayInit:
|
|
case SK_PassByIndirectCopyRestore:
|
|
case SK_PassByIndirectRestore:
|
|
case SK_ProduceObjCObject:
|
|
case SK_StdInitializerList:
|
|
case SK_StdInitializerListConstructorCall:
|
|
case SK_OCLSamplerInit:
|
|
case SK_OCLZeroEvent:
|
|
break;
|
|
|
|
case SK_ConversionSequence:
|
|
case SK_ConversionSequenceNoNarrowing:
|
|
delete ICS;
|
|
}
|
|
}
|
|
|
|
bool InitializationSequence::isDirectReferenceBinding() const {
|
|
return !Steps.empty() && Steps.back().Kind == SK_BindReference;
|
|
}
|
|
|
|
bool InitializationSequence::isAmbiguous() const {
|
|
if (!Failed())
|
|
return false;
|
|
|
|
switch (getFailureKind()) {
|
|
case FK_TooManyInitsForReference:
|
|
case FK_ArrayNeedsInitList:
|
|
case FK_ArrayNeedsInitListOrStringLiteral:
|
|
case FK_ArrayNeedsInitListOrWideStringLiteral:
|
|
case FK_NarrowStringIntoWideCharArray:
|
|
case FK_WideStringIntoCharArray:
|
|
case FK_IncompatWideStringIntoWideChar:
|
|
case FK_AddressOfOverloadFailed: // FIXME: Could do better
|
|
case FK_NonConstLValueReferenceBindingToTemporary:
|
|
case FK_NonConstLValueReferenceBindingToUnrelated:
|
|
case FK_RValueReferenceBindingToLValue:
|
|
case FK_ReferenceInitDropsQualifiers:
|
|
case FK_ReferenceInitFailed:
|
|
case FK_ConversionFailed:
|
|
case FK_ConversionFromPropertyFailed:
|
|
case FK_TooManyInitsForScalar:
|
|
case FK_ReferenceBindingToInitList:
|
|
case FK_InitListBadDestinationType:
|
|
case FK_DefaultInitOfConst:
|
|
case FK_Incomplete:
|
|
case FK_ArrayTypeMismatch:
|
|
case FK_NonConstantArrayInit:
|
|
case FK_ListInitializationFailed:
|
|
case FK_VariableLengthArrayHasInitializer:
|
|
case FK_PlaceholderType:
|
|
case FK_ExplicitConstructor:
|
|
return false;
|
|
|
|
case FK_ReferenceInitOverloadFailed:
|
|
case FK_UserConversionOverloadFailed:
|
|
case FK_ConstructorOverloadFailed:
|
|
case FK_ListConstructorOverloadFailed:
|
|
return FailedOverloadResult == OR_Ambiguous;
|
|
}
|
|
|
|
llvm_unreachable("Invalid EntityKind!");
|
|
}
|
|
|
|
bool InitializationSequence::isConstructorInitialization() const {
|
|
return !Steps.empty() && Steps.back().Kind == SK_ConstructorInitialization;
|
|
}
|
|
|
|
void
|
|
InitializationSequence
|
|
::AddAddressOverloadResolutionStep(FunctionDecl *Function,
|
|
DeclAccessPair Found,
|
|
bool HadMultipleCandidates) {
|
|
Step S;
|
|
S.Kind = SK_ResolveAddressOfOverloadedFunction;
|
|
S.Type = Function->getType();
|
|
S.Function.HadMultipleCandidates = HadMultipleCandidates;
|
|
S.Function.Function = Function;
|
|
S.Function.FoundDecl = Found;
|
|
Steps.push_back(S);
|
|
}
|
|
|
|
void InitializationSequence::AddDerivedToBaseCastStep(QualType BaseType,
|
|
ExprValueKind VK) {
|
|
Step S;
|
|
switch (VK) {
|
|
case VK_RValue: S.Kind = SK_CastDerivedToBaseRValue; break;
|
|
case VK_XValue: S.Kind = SK_CastDerivedToBaseXValue; break;
|
|
case VK_LValue: S.Kind = SK_CastDerivedToBaseLValue; break;
|
|
}
|
|
S.Type = BaseType;
|
|
Steps.push_back(S);
|
|
}
|
|
|
|
void InitializationSequence::AddReferenceBindingStep(QualType T,
|
|
bool BindingTemporary) {
|
|
Step S;
|
|
S.Kind = BindingTemporary? SK_BindReferenceToTemporary : SK_BindReference;
|
|
S.Type = T;
|
|
Steps.push_back(S);
|
|
}
|
|
|
|
void InitializationSequence::AddExtraneousCopyToTemporary(QualType T) {
|
|
Step S;
|
|
S.Kind = SK_ExtraneousCopyToTemporary;
|
|
S.Type = T;
|
|
Steps.push_back(S);
|
|
}
|
|
|
|
void
|
|
InitializationSequence::AddUserConversionStep(FunctionDecl *Function,
|
|
DeclAccessPair FoundDecl,
|
|
QualType T,
|
|
bool HadMultipleCandidates) {
|
|
Step S;
|
|
S.Kind = SK_UserConversion;
|
|
S.Type = T;
|
|
S.Function.HadMultipleCandidates = HadMultipleCandidates;
|
|
S.Function.Function = Function;
|
|
S.Function.FoundDecl = FoundDecl;
|
|
Steps.push_back(S);
|
|
}
|
|
|
|
void InitializationSequence::AddQualificationConversionStep(QualType Ty,
|
|
ExprValueKind VK) {
|
|
Step S;
|
|
S.Kind = SK_QualificationConversionRValue; // work around a gcc warning
|
|
switch (VK) {
|
|
case VK_RValue:
|
|
S.Kind = SK_QualificationConversionRValue;
|
|
break;
|
|
case VK_XValue:
|
|
S.Kind = SK_QualificationConversionXValue;
|
|
break;
|
|
case VK_LValue:
|
|
S.Kind = SK_QualificationConversionLValue;
|
|
break;
|
|
}
|
|
S.Type = Ty;
|
|
Steps.push_back(S);
|
|
}
|
|
|
|
void InitializationSequence::AddAtomicConversionStep(QualType Ty) {
|
|
Step S;
|
|
S.Kind = SK_AtomicConversion;
|
|
S.Type = Ty;
|
|
Steps.push_back(S);
|
|
}
|
|
|
|
void InitializationSequence::AddLValueToRValueStep(QualType Ty) {
|
|
assert(!Ty.hasQualifiers() && "rvalues may not have qualifiers");
|
|
|
|
Step S;
|
|
S.Kind = SK_LValueToRValue;
|
|
S.Type = Ty;
|
|
Steps.push_back(S);
|
|
}
|
|
|
|
void InitializationSequence::AddConversionSequenceStep(
|
|
const ImplicitConversionSequence &ICS, QualType T,
|
|
bool TopLevelOfInitList) {
|
|
Step S;
|
|
S.Kind = TopLevelOfInitList ? SK_ConversionSequenceNoNarrowing
|
|
: SK_ConversionSequence;
|
|
S.Type = T;
|
|
S.ICS = new ImplicitConversionSequence(ICS);
|
|
Steps.push_back(S);
|
|
}
|
|
|
|
void InitializationSequence::AddListInitializationStep(QualType T) {
|
|
Step S;
|
|
S.Kind = SK_ListInitialization;
|
|
S.Type = T;
|
|
Steps.push_back(S);
|
|
}
|
|
|
|
void
|
|
InitializationSequence
|
|
::AddConstructorInitializationStep(CXXConstructorDecl *Constructor,
|
|
AccessSpecifier Access,
|
|
QualType T,
|
|
bool HadMultipleCandidates,
|
|
bool FromInitList, bool AsInitList) {
|
|
Step S;
|
|
S.Kind = FromInitList ? AsInitList ? SK_StdInitializerListConstructorCall
|
|
: SK_ConstructorInitializationFromList
|
|
: SK_ConstructorInitialization;
|
|
S.Type = T;
|
|
S.Function.HadMultipleCandidates = HadMultipleCandidates;
|
|
S.Function.Function = Constructor;
|
|
S.Function.FoundDecl = DeclAccessPair::make(Constructor, Access);
|
|
Steps.push_back(S);
|
|
}
|
|
|
|
void InitializationSequence::AddZeroInitializationStep(QualType T) {
|
|
Step S;
|
|
S.Kind = SK_ZeroInitialization;
|
|
S.Type = T;
|
|
Steps.push_back(S);
|
|
}
|
|
|
|
void InitializationSequence::AddCAssignmentStep(QualType T) {
|
|
Step S;
|
|
S.Kind = SK_CAssignment;
|
|
S.Type = T;
|
|
Steps.push_back(S);
|
|
}
|
|
|
|
void InitializationSequence::AddStringInitStep(QualType T) {
|
|
Step S;
|
|
S.Kind = SK_StringInit;
|
|
S.Type = T;
|
|
Steps.push_back(S);
|
|
}
|
|
|
|
void InitializationSequence::AddObjCObjectConversionStep(QualType T) {
|
|
Step S;
|
|
S.Kind = SK_ObjCObjectConversion;
|
|
S.Type = T;
|
|
Steps.push_back(S);
|
|
}
|
|
|
|
void InitializationSequence::AddArrayInitStep(QualType T) {
|
|
Step S;
|
|
S.Kind = SK_ArrayInit;
|
|
S.Type = T;
|
|
Steps.push_back(S);
|
|
}
|
|
|
|
void InitializationSequence::AddParenthesizedArrayInitStep(QualType T) {
|
|
Step S;
|
|
S.Kind = SK_ParenthesizedArrayInit;
|
|
S.Type = T;
|
|
Steps.push_back(S);
|
|
}
|
|
|
|
void InitializationSequence::AddPassByIndirectCopyRestoreStep(QualType type,
|
|
bool shouldCopy) {
|
|
Step s;
|
|
s.Kind = (shouldCopy ? SK_PassByIndirectCopyRestore
|
|
: SK_PassByIndirectRestore);
|
|
s.Type = type;
|
|
Steps.push_back(s);
|
|
}
|
|
|
|
void InitializationSequence::AddProduceObjCObjectStep(QualType T) {
|
|
Step S;
|
|
S.Kind = SK_ProduceObjCObject;
|
|
S.Type = T;
|
|
Steps.push_back(S);
|
|
}
|
|
|
|
void InitializationSequence::AddStdInitializerListConstructionStep(QualType T) {
|
|
Step S;
|
|
S.Kind = SK_StdInitializerList;
|
|
S.Type = T;
|
|
Steps.push_back(S);
|
|
}
|
|
|
|
void InitializationSequence::AddOCLSamplerInitStep(QualType T) {
|
|
Step S;
|
|
S.Kind = SK_OCLSamplerInit;
|
|
S.Type = T;
|
|
Steps.push_back(S);
|
|
}
|
|
|
|
void InitializationSequence::AddOCLZeroEventStep(QualType T) {
|
|
Step S;
|
|
S.Kind = SK_OCLZeroEvent;
|
|
S.Type = T;
|
|
Steps.push_back(S);
|
|
}
|
|
|
|
void InitializationSequence::RewrapReferenceInitList(QualType T,
|
|
InitListExpr *Syntactic) {
|
|
assert(Syntactic->getNumInits() == 1 &&
|
|
"Can only rewrap trivial init lists.");
|
|
Step S;
|
|
S.Kind = SK_UnwrapInitList;
|
|
S.Type = Syntactic->getInit(0)->getType();
|
|
Steps.insert(Steps.begin(), S);
|
|
|
|
S.Kind = SK_RewrapInitList;
|
|
S.Type = T;
|
|
S.WrappingSyntacticList = Syntactic;
|
|
Steps.push_back(S);
|
|
}
|
|
|
|
void InitializationSequence::SetOverloadFailure(FailureKind Failure,
|
|
OverloadingResult Result) {
|
|
setSequenceKind(FailedSequence);
|
|
this->Failure = Failure;
|
|
this->FailedOverloadResult = Result;
|
|
}
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// Attempt initialization
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
static void MaybeProduceObjCObject(Sema &S,
|
|
InitializationSequence &Sequence,
|
|
const InitializedEntity &Entity) {
|
|
if (!S.getLangOpts().ObjCAutoRefCount) return;
|
|
|
|
/// When initializing a parameter, produce the value if it's marked
|
|
/// __attribute__((ns_consumed)).
|
|
if (Entity.isParameterKind()) {
|
|
if (!Entity.isParameterConsumed())
|
|
return;
|
|
|
|
assert(Entity.getType()->isObjCRetainableType() &&
|
|
"consuming an object of unretainable type?");
|
|
Sequence.AddProduceObjCObjectStep(Entity.getType());
|
|
|
|
/// When initializing a return value, if the return type is a
|
|
/// retainable type, then returns need to immediately retain the
|
|
/// object. If an autorelease is required, it will be done at the
|
|
/// last instant.
|
|
} else if (Entity.getKind() == InitializedEntity::EK_Result) {
|
|
if (!Entity.getType()->isObjCRetainableType())
|
|
return;
|
|
|
|
Sequence.AddProduceObjCObjectStep(Entity.getType());
|
|
}
|
|
}
|
|
|
|
static void TryListInitialization(Sema &S,
|
|
const InitializedEntity &Entity,
|
|
const InitializationKind &Kind,
|
|
InitListExpr *InitList,
|
|
InitializationSequence &Sequence);
|
|
|
|
/// \brief When initializing from init list via constructor, handle
|
|
/// initialization of an object of type std::initializer_list<T>.
|
|
///
|
|
/// \return true if we have handled initialization of an object of type
|
|
/// std::initializer_list<T>, false otherwise.
|
|
static bool TryInitializerListConstruction(Sema &S,
|
|
InitListExpr *List,
|
|
QualType DestType,
|
|
InitializationSequence &Sequence) {
|
|
QualType E;
|
|
if (!S.isStdInitializerList(DestType, &E))
|
|
return false;
|
|
|
|
if (S.RequireCompleteType(List->getExprLoc(), E, 0)) {
|
|
Sequence.setIncompleteTypeFailure(E);
|
|
return true;
|
|
}
|
|
|
|
// Try initializing a temporary array from the init list.
|
|
QualType ArrayType = S.Context.getConstantArrayType(
|
|
E.withConst(), llvm::APInt(S.Context.getTypeSize(S.Context.getSizeType()),
|
|
List->getNumInits()),
|
|
clang::ArrayType::Normal, 0);
|
|
InitializedEntity HiddenArray =
|
|
InitializedEntity::InitializeTemporary(ArrayType);
|
|
InitializationKind Kind =
|
|
InitializationKind::CreateDirectList(List->getExprLoc());
|
|
TryListInitialization(S, HiddenArray, Kind, List, Sequence);
|
|
if (Sequence)
|
|
Sequence.AddStdInitializerListConstructionStep(DestType);
|
|
return true;
|
|
}
|
|
|
|
static OverloadingResult
|
|
ResolveConstructorOverload(Sema &S, SourceLocation DeclLoc,
|
|
MultiExprArg Args,
|
|
OverloadCandidateSet &CandidateSet,
|
|
ArrayRef<NamedDecl *> Ctors,
|
|
OverloadCandidateSet::iterator &Best,
|
|
bool CopyInitializing, bool AllowExplicit,
|
|
bool OnlyListConstructors) {
|
|
CandidateSet.clear();
|
|
|
|
for (ArrayRef<NamedDecl *>::iterator
|
|
Con = Ctors.begin(), ConEnd = Ctors.end(); Con != ConEnd; ++Con) {
|
|
NamedDecl *D = *Con;
|
|
DeclAccessPair FoundDecl = DeclAccessPair::make(D, D->getAccess());
|
|
bool SuppressUserConversions = false;
|
|
|
|
// Find the constructor (which may be a template).
|
|
CXXConstructorDecl *Constructor = nullptr;
|
|
FunctionTemplateDecl *ConstructorTmpl = dyn_cast<FunctionTemplateDecl>(D);
|
|
if (ConstructorTmpl)
|
|
Constructor = cast<CXXConstructorDecl>(
|
|
ConstructorTmpl->getTemplatedDecl());
|
|
else {
|
|
Constructor = cast<CXXConstructorDecl>(D);
|
|
|
|
// C++11 [over.best.ics]p4:
|
|
// ... and the constructor or user-defined conversion function is a
|
|
// candidate by
|
|
// — 13.3.1.3, when the argument is the temporary in the second step
|
|
// of a class copy-initialization, or
|
|
// — 13.3.1.4, 13.3.1.5, or 13.3.1.6 (in all cases),
|
|
// user-defined conversion sequences are not considered.
|
|
if (CopyInitializing && Constructor->isCopyOrMoveConstructor())
|
|
SuppressUserConversions = true;
|
|
}
|
|
|
|
if (!Constructor->isInvalidDecl() &&
|
|
(AllowExplicit || !Constructor->isExplicit()) &&
|
|
(!OnlyListConstructors || S.isInitListConstructor(Constructor))) {
|
|
if (ConstructorTmpl)
|
|
S.AddTemplateOverloadCandidate(ConstructorTmpl, FoundDecl,
|
|
/*ExplicitArgs*/ nullptr, Args,
|
|
CandidateSet, SuppressUserConversions);
|
|
else {
|
|
// C++ [over.match.copy]p1:
|
|
// - When initializing a temporary to be bound to the first parameter
|
|
// of a constructor that takes a reference to possibly cv-qualified
|
|
// T as its first argument, called with a single argument in the
|
|
// context of direct-initialization, explicit conversion functions
|
|
// are also considered.
|
|
bool AllowExplicitConv = AllowExplicit && !CopyInitializing &&
|
|
Args.size() == 1 &&
|
|
Constructor->isCopyOrMoveConstructor();
|
|
S.AddOverloadCandidate(Constructor, FoundDecl, Args, CandidateSet,
|
|
SuppressUserConversions,
|
|
/*PartialOverloading=*/false,
|
|
/*AllowExplicit=*/AllowExplicitConv);
|
|
}
|
|
}
|
|
}
|
|
|
|
// Perform overload resolution and return the result.
|
|
return CandidateSet.BestViableFunction(S, DeclLoc, Best);
|
|
}
|
|
|
|
/// \brief Attempt initialization by constructor (C++ [dcl.init]), which
|
|
/// enumerates the constructors of the initialized entity and performs overload
|
|
/// resolution to select the best.
|
|
/// If InitListSyntax is true, this is list-initialization of a non-aggregate
|
|
/// class type.
|
|
static void TryConstructorInitialization(Sema &S,
|
|
const InitializedEntity &Entity,
|
|
const InitializationKind &Kind,
|
|
MultiExprArg Args, QualType DestType,
|
|
InitializationSequence &Sequence,
|
|
bool InitListSyntax = false) {
|
|
assert((!InitListSyntax || (Args.size() == 1 && isa<InitListExpr>(Args[0]))) &&
|
|
"InitListSyntax must come with a single initializer list argument.");
|
|
|
|
// The type we're constructing needs to be complete.
|
|
if (S.RequireCompleteType(Kind.getLocation(), DestType, 0)) {
|
|
Sequence.setIncompleteTypeFailure(DestType);
|
|
return;
|
|
}
|
|
|
|
const RecordType *DestRecordType = DestType->getAs<RecordType>();
|
|
assert(DestRecordType && "Constructor initialization requires record type");
|
|
CXXRecordDecl *DestRecordDecl
|
|
= cast<CXXRecordDecl>(DestRecordType->getDecl());
|
|
|
|
// Build the candidate set directly in the initialization sequence
|
|
// structure, so that it will persist if we fail.
|
|
OverloadCandidateSet &CandidateSet = Sequence.getFailedCandidateSet();
|
|
|
|
// Determine whether we are allowed to call explicit constructors or
|
|
// explicit conversion operators.
|
|
bool AllowExplicit = Kind.AllowExplicit() || InitListSyntax;
|
|
bool CopyInitialization = Kind.getKind() == InitializationKind::IK_Copy;
|
|
|
|
// - Otherwise, if T is a class type, constructors are considered. The
|
|
// applicable constructors are enumerated, and the best one is chosen
|
|
// through overload resolution.
|
|
DeclContext::lookup_result R = S.LookupConstructors(DestRecordDecl);
|
|
// The container holding the constructors can under certain conditions
|
|
// be changed while iterating (e.g. because of deserialization).
|
|
// To be safe we copy the lookup results to a new container.
|
|
SmallVector<NamedDecl*, 16> Ctors(R.begin(), R.end());
|
|
|
|
OverloadingResult Result = OR_No_Viable_Function;
|
|
OverloadCandidateSet::iterator Best;
|
|
bool AsInitializerList = false;
|
|
|
|
// C++11 [over.match.list]p1, per DR1467:
|
|
// When objects of non-aggregate type T are list-initialized, such that
|
|
// 8.5.4 [dcl.init.list] specifies that overload resolution is performed
|
|
// according to the rules in this section, overload resolution selects
|
|
// the constructor in two phases:
|
|
//
|
|
// - Initially, the candidate functions are the initializer-list
|
|
// constructors of the class T and the argument list consists of the
|
|
// initializer list as a single argument.
|
|
if (InitListSyntax) {
|
|
InitListExpr *ILE = cast<InitListExpr>(Args[0]);
|
|
AsInitializerList = true;
|
|
|
|
// If the initializer list has no elements and T has a default constructor,
|
|
// the first phase is omitted.
|
|
if (ILE->getNumInits() != 0 || !DestRecordDecl->hasDefaultConstructor())
|
|
Result = ResolveConstructorOverload(S, Kind.getLocation(), Args,
|
|
CandidateSet, Ctors, Best,
|
|
CopyInitialization, AllowExplicit,
|
|
/*OnlyListConstructor=*/true);
|
|
|
|
// Time to unwrap the init list.
|
|
Args = MultiExprArg(ILE->getInits(), ILE->getNumInits());
|
|
}
|
|
|
|
// C++11 [over.match.list]p1:
|
|
// - If no viable initializer-list constructor is found, overload resolution
|
|
// is performed again, where the candidate functions are all the
|
|
// constructors of the class T and the argument list consists of the
|
|
// elements of the initializer list.
|
|
if (Result == OR_No_Viable_Function) {
|
|
AsInitializerList = false;
|
|
Result = ResolveConstructorOverload(S, Kind.getLocation(), Args,
|
|
CandidateSet, Ctors, Best,
|
|
CopyInitialization, AllowExplicit,
|
|
/*OnlyListConstructors=*/false);
|
|
}
|
|
if (Result) {
|
|
Sequence.SetOverloadFailure(InitListSyntax ?
|
|
InitializationSequence::FK_ListConstructorOverloadFailed :
|
|
InitializationSequence::FK_ConstructorOverloadFailed,
|
|
Result);
|
|
return;
|
|
}
|
|
|
|
// C++11 [dcl.init]p6:
|
|
// If a program calls for the default initialization of an object
|
|
// of a const-qualified type T, T shall be a class type with a
|
|
// user-provided default constructor.
|
|
if (Kind.getKind() == InitializationKind::IK_Default &&
|
|
Entity.getType().isConstQualified() &&
|
|
!cast<CXXConstructorDecl>(Best->Function)->isUserProvided()) {
|
|
Sequence.SetFailed(InitializationSequence::FK_DefaultInitOfConst);
|
|
return;
|
|
}
|
|
|
|
// C++11 [over.match.list]p1:
|
|
// In copy-list-initialization, if an explicit constructor is chosen, the
|
|
// initializer is ill-formed.
|
|
CXXConstructorDecl *CtorDecl = cast<CXXConstructorDecl>(Best->Function);
|
|
if (InitListSyntax && !Kind.AllowExplicit() && CtorDecl->isExplicit()) {
|
|
Sequence.SetFailed(InitializationSequence::FK_ExplicitConstructor);
|
|
return;
|
|
}
|
|
|
|
// Add the constructor initialization step. Any cv-qualification conversion is
|
|
// subsumed by the initialization.
|
|
bool HadMultipleCandidates = (CandidateSet.size() > 1);
|
|
Sequence.AddConstructorInitializationStep(CtorDecl,
|
|
Best->FoundDecl.getAccess(),
|
|
DestType, HadMultipleCandidates,
|
|
InitListSyntax, AsInitializerList);
|
|
}
|
|
|
|
static bool
|
|
ResolveOverloadedFunctionForReferenceBinding(Sema &S,
|
|
Expr *Initializer,
|
|
QualType &SourceType,
|
|
QualType &UnqualifiedSourceType,
|
|
QualType UnqualifiedTargetType,
|
|
InitializationSequence &Sequence) {
|
|
if (S.Context.getCanonicalType(UnqualifiedSourceType) ==
|
|
S.Context.OverloadTy) {
|
|
DeclAccessPair Found;
|
|
bool HadMultipleCandidates = false;
|
|
if (FunctionDecl *Fn
|
|
= S.ResolveAddressOfOverloadedFunction(Initializer,
|
|
UnqualifiedTargetType,
|
|
false, Found,
|
|
&HadMultipleCandidates)) {
|
|
Sequence.AddAddressOverloadResolutionStep(Fn, Found,
|
|
HadMultipleCandidates);
|
|
SourceType = Fn->getType();
|
|
UnqualifiedSourceType = SourceType.getUnqualifiedType();
|
|
} else if (!UnqualifiedTargetType->isRecordType()) {
|
|
Sequence.SetFailed(InitializationSequence::FK_AddressOfOverloadFailed);
|
|
return true;
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
static void TryReferenceInitializationCore(Sema &S,
|
|
const InitializedEntity &Entity,
|
|
const InitializationKind &Kind,
|
|
Expr *Initializer,
|
|
QualType cv1T1, QualType T1,
|
|
Qualifiers T1Quals,
|
|
QualType cv2T2, QualType T2,
|
|
Qualifiers T2Quals,
|
|
InitializationSequence &Sequence);
|
|
|
|
static void TryValueInitialization(Sema &S,
|
|
const InitializedEntity &Entity,
|
|
const InitializationKind &Kind,
|
|
InitializationSequence &Sequence,
|
|
InitListExpr *InitList = nullptr);
|
|
|
|
/// \brief Attempt list initialization of a reference.
|
|
static void TryReferenceListInitialization(Sema &S,
|
|
const InitializedEntity &Entity,
|
|
const InitializationKind &Kind,
|
|
InitListExpr *InitList,
|
|
InitializationSequence &Sequence) {
|
|
// First, catch C++03 where this isn't possible.
|
|
if (!S.getLangOpts().CPlusPlus11) {
|
|
Sequence.SetFailed(InitializationSequence::FK_ReferenceBindingToInitList);
|
|
return;
|
|
}
|
|
|
|
QualType DestType = Entity.getType();
|
|
QualType cv1T1 = DestType->getAs<ReferenceType>()->getPointeeType();
|
|
Qualifiers T1Quals;
|
|
QualType T1 = S.Context.getUnqualifiedArrayType(cv1T1, T1Quals);
|
|
|
|
// Reference initialization via an initializer list works thus:
|
|
// If the initializer list consists of a single element that is
|
|
// reference-related to the referenced type, bind directly to that element
|
|
// (possibly creating temporaries).
|
|
// Otherwise, initialize a temporary with the initializer list and
|
|
// bind to that.
|
|
if (InitList->getNumInits() == 1) {
|
|
Expr *Initializer = InitList->getInit(0);
|
|
QualType cv2T2 = Initializer->getType();
|
|
Qualifiers T2Quals;
|
|
QualType T2 = S.Context.getUnqualifiedArrayType(cv2T2, T2Quals);
|
|
|
|
// If this fails, creating a temporary wouldn't work either.
|
|
if (ResolveOverloadedFunctionForReferenceBinding(S, Initializer, cv2T2, T2,
|
|
T1, Sequence))
|
|
return;
|
|
|
|
SourceLocation DeclLoc = Initializer->getLocStart();
|
|
bool dummy1, dummy2, dummy3;
|
|
Sema::ReferenceCompareResult RefRelationship
|
|
= S.CompareReferenceRelationship(DeclLoc, cv1T1, cv2T2, dummy1,
|
|
dummy2, dummy3);
|
|
if (RefRelationship >= Sema::Ref_Related) {
|
|
// Try to bind the reference here.
|
|
TryReferenceInitializationCore(S, Entity, Kind, Initializer, cv1T1, T1,
|
|
T1Quals, cv2T2, T2, T2Quals, Sequence);
|
|
if (Sequence)
|
|
Sequence.RewrapReferenceInitList(cv1T1, InitList);
|
|
return;
|
|
}
|
|
|
|
// Update the initializer if we've resolved an overloaded function.
|
|
if (Sequence.step_begin() != Sequence.step_end())
|
|
Sequence.RewrapReferenceInitList(cv1T1, InitList);
|
|
}
|
|
|
|
// Not reference-related. Create a temporary and bind to that.
|
|
InitializedEntity TempEntity = InitializedEntity::InitializeTemporary(cv1T1);
|
|
|
|
TryListInitialization(S, TempEntity, Kind, InitList, Sequence);
|
|
if (Sequence) {
|
|
if (DestType->isRValueReferenceType() ||
|
|
(T1Quals.hasConst() && !T1Quals.hasVolatile()))
|
|
Sequence.AddReferenceBindingStep(cv1T1, /*bindingTemporary=*/true);
|
|
else
|
|
Sequence.SetFailed(
|
|
InitializationSequence::FK_NonConstLValueReferenceBindingToTemporary);
|
|
}
|
|
}
|
|
|
|
/// \brief Attempt list initialization (C++0x [dcl.init.list])
|
|
static void TryListInitialization(Sema &S,
|
|
const InitializedEntity &Entity,
|
|
const InitializationKind &Kind,
|
|
InitListExpr *InitList,
|
|
InitializationSequence &Sequence) {
|
|
QualType DestType = Entity.getType();
|
|
|
|
// C++ doesn't allow scalar initialization with more than one argument.
|
|
// But C99 complex numbers are scalars and it makes sense there.
|
|
if (S.getLangOpts().CPlusPlus && DestType->isScalarType() &&
|
|
!DestType->isAnyComplexType() && InitList->getNumInits() > 1) {
|
|
Sequence.SetFailed(InitializationSequence::FK_TooManyInitsForScalar);
|
|
return;
|
|
}
|
|
if (DestType->isReferenceType()) {
|
|
TryReferenceListInitialization(S, Entity, Kind, InitList, Sequence);
|
|
return;
|
|
}
|
|
|
|
if (DestType->isRecordType() &&
|
|
S.RequireCompleteType(InitList->getLocStart(), DestType, 0)) {
|
|
Sequence.setIncompleteTypeFailure(DestType);
|
|
return;
|
|
}
|
|
|
|
// C++11 [dcl.init.list]p3, per DR1467:
|
|
// - If T is a class type and the initializer list has a single element of
|
|
// type cv U, where U is T or a class derived from T, the object is
|
|
// initialized from that element (by copy-initialization for
|
|
// copy-list-initialization, or by direct-initialization for
|
|
// direct-list-initialization).
|
|
// - Otherwise, if T is a character array and the initializer list has a
|
|
// single element that is an appropriately-typed string literal
|
|
// (8.5.2 [dcl.init.string]), initialization is performed as described
|
|
// in that section.
|
|
// - Otherwise, if T is an aggregate, [...] (continue below).
|
|
if (S.getLangOpts().CPlusPlus11 && InitList->getNumInits() == 1) {
|
|
if (DestType->isRecordType()) {
|
|
QualType InitType = InitList->getInit(0)->getType();
|
|
if (S.Context.hasSameUnqualifiedType(InitType, DestType) ||
|
|
S.IsDerivedFrom(InitType, DestType)) {
|
|
Expr *InitListAsExpr = InitList;
|
|
TryConstructorInitialization(S, Entity, Kind, InitListAsExpr, DestType,
|
|
Sequence, /*InitListSyntax*/true);
|
|
return;
|
|
}
|
|
}
|
|
if (const ArrayType *DestAT = S.Context.getAsArrayType(DestType)) {
|
|
Expr *SubInit[1] = {InitList->getInit(0)};
|
|
if (!isa<VariableArrayType>(DestAT) &&
|
|
IsStringInit(SubInit[0], DestAT, S.Context) == SIF_None) {
|
|
InitializationKind SubKind =
|
|
Kind.getKind() == InitializationKind::IK_DirectList
|
|
? InitializationKind::CreateDirect(Kind.getLocation(),
|
|
InitList->getLBraceLoc(),
|
|
InitList->getRBraceLoc())
|
|
: Kind;
|
|
Sequence.InitializeFrom(S, Entity, SubKind, SubInit,
|
|
/*TopLevelOfInitList*/ true);
|
|
|
|
// TryStringLiteralInitialization() (in InitializeFrom()) will fail if
|
|
// the element is not an appropriately-typed string literal, in which
|
|
// case we should proceed as in C++11 (below).
|
|
if (Sequence) {
|
|
Sequence.RewrapReferenceInitList(Entity.getType(), InitList);
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// C++11 [dcl.init.list]p3:
|
|
// - If T is an aggregate, aggregate initialization is performed.
|
|
if (DestType->isRecordType() && !DestType->isAggregateType()) {
|
|
if (S.getLangOpts().CPlusPlus11) {
|
|
// - Otherwise, if the initializer list has no elements and T is a
|
|
// class type with a default constructor, the object is
|
|
// value-initialized.
|
|
if (InitList->getNumInits() == 0) {
|
|
CXXRecordDecl *RD = DestType->getAsCXXRecordDecl();
|
|
if (RD->hasDefaultConstructor()) {
|
|
TryValueInitialization(S, Entity, Kind, Sequence, InitList);
|
|
return;
|
|
}
|
|
}
|
|
|
|
// - Otherwise, if T is a specialization of std::initializer_list<E>,
|
|
// an initializer_list object constructed [...]
|
|
if (TryInitializerListConstruction(S, InitList, DestType, Sequence))
|
|
return;
|
|
|
|
// - Otherwise, if T is a class type, constructors are considered.
|
|
Expr *InitListAsExpr = InitList;
|
|
TryConstructorInitialization(S, Entity, Kind, InitListAsExpr, DestType,
|
|
Sequence, /*InitListSyntax*/ true);
|
|
} else
|
|
Sequence.SetFailed(InitializationSequence::FK_InitListBadDestinationType);
|
|
return;
|
|
}
|
|
|
|
if (S.getLangOpts().CPlusPlus && !DestType->isAggregateType() &&
|
|
InitList->getNumInits() == 1 &&
|
|
InitList->getInit(0)->getType()->isRecordType()) {
|
|
// - Otherwise, if the initializer list has a single element of type E
|
|
// [...references are handled above...], the object or reference is
|
|
// initialized from that element (by copy-initialization for
|
|
// copy-list-initialization, or by direct-initialization for
|
|
// direct-list-initialization); if a narrowing conversion is required
|
|
// to convert the element to T, the program is ill-formed.
|
|
//
|
|
// Per core-24034, this is direct-initialization if we were performing
|
|
// direct-list-initialization and copy-initialization otherwise.
|
|
// We can't use InitListChecker for this, because it always performs
|
|
// copy-initialization. This only matters if we might use an 'explicit'
|
|
// conversion operator, so we only need to handle the cases where the source
|
|
// is of record type.
|
|
InitializationKind SubKind =
|
|
Kind.getKind() == InitializationKind::IK_DirectList
|
|
? InitializationKind::CreateDirect(Kind.getLocation(),
|
|
InitList->getLBraceLoc(),
|
|
InitList->getRBraceLoc())
|
|
: Kind;
|
|
Expr *SubInit[1] = { InitList->getInit(0) };
|
|
Sequence.InitializeFrom(S, Entity, SubKind, SubInit,
|
|
/*TopLevelOfInitList*/true);
|
|
if (Sequence)
|
|
Sequence.RewrapReferenceInitList(Entity.getType(), InitList);
|
|
return;
|
|
}
|
|
|
|
InitListChecker CheckInitList(S, Entity, InitList,
|
|
DestType, /*VerifyOnly=*/true);
|
|
if (CheckInitList.HadError()) {
|
|
Sequence.SetFailed(InitializationSequence::FK_ListInitializationFailed);
|
|
return;
|
|
}
|
|
|
|
// Add the list initialization step with the built init list.
|
|
Sequence.AddListInitializationStep(DestType);
|
|
}
|
|
|
|
/// \brief Try a reference initialization that involves calling a conversion
|
|
/// function.
|
|
static OverloadingResult TryRefInitWithConversionFunction(Sema &S,
|
|
const InitializedEntity &Entity,
|
|
const InitializationKind &Kind,
|
|
Expr *Initializer,
|
|
bool AllowRValues,
|
|
InitializationSequence &Sequence) {
|
|
QualType DestType = Entity.getType();
|
|
QualType cv1T1 = DestType->getAs<ReferenceType>()->getPointeeType();
|
|
QualType T1 = cv1T1.getUnqualifiedType();
|
|
QualType cv2T2 = Initializer->getType();
|
|
QualType T2 = cv2T2.getUnqualifiedType();
|
|
|
|
bool DerivedToBase;
|
|
bool ObjCConversion;
|
|
bool ObjCLifetimeConversion;
|
|
assert(!S.CompareReferenceRelationship(Initializer->getLocStart(),
|
|
T1, T2, DerivedToBase,
|
|
ObjCConversion,
|
|
ObjCLifetimeConversion) &&
|
|
"Must have incompatible references when binding via conversion");
|
|
(void)DerivedToBase;
|
|
(void)ObjCConversion;
|
|
(void)ObjCLifetimeConversion;
|
|
|
|
// Build the candidate set directly in the initialization sequence
|
|
// structure, so that it will persist if we fail.
|
|
OverloadCandidateSet &CandidateSet = Sequence.getFailedCandidateSet();
|
|
CandidateSet.clear();
|
|
|
|
// Determine whether we are allowed to call explicit constructors or
|
|
// explicit conversion operators.
|
|
bool AllowExplicit = Kind.AllowExplicit();
|
|
bool AllowExplicitConvs = Kind.allowExplicitConversionFunctionsInRefBinding();
|
|
|
|
const RecordType *T1RecordType = nullptr;
|
|
if (AllowRValues && (T1RecordType = T1->getAs<RecordType>()) &&
|
|
!S.RequireCompleteType(Kind.getLocation(), T1, 0)) {
|
|
// The type we're converting to is a class type. Enumerate its constructors
|
|
// to see if there is a suitable conversion.
|
|
CXXRecordDecl *T1RecordDecl = cast<CXXRecordDecl>(T1RecordType->getDecl());
|
|
|
|
DeclContext::lookup_result R = S.LookupConstructors(T1RecordDecl);
|
|
// The container holding the constructors can under certain conditions
|
|
// be changed while iterating (e.g. because of deserialization).
|
|
// To be safe we copy the lookup results to a new container.
|
|
SmallVector<NamedDecl*, 16> Ctors(R.begin(), R.end());
|
|
for (SmallVectorImpl<NamedDecl *>::iterator
|
|
CI = Ctors.begin(), CE = Ctors.end(); CI != CE; ++CI) {
|
|
NamedDecl *D = *CI;
|
|
DeclAccessPair FoundDecl = DeclAccessPair::make(D, D->getAccess());
|
|
|
|
// Find the constructor (which may be a template).
|
|
CXXConstructorDecl *Constructor = nullptr;
|
|
FunctionTemplateDecl *ConstructorTmpl = dyn_cast<FunctionTemplateDecl>(D);
|
|
if (ConstructorTmpl)
|
|
Constructor = cast<CXXConstructorDecl>(
|
|
ConstructorTmpl->getTemplatedDecl());
|
|
else
|
|
Constructor = cast<CXXConstructorDecl>(D);
|
|
|
|
if (!Constructor->isInvalidDecl() &&
|
|
Constructor->isConvertingConstructor(AllowExplicit)) {
|
|
if (ConstructorTmpl)
|
|
S.AddTemplateOverloadCandidate(ConstructorTmpl, FoundDecl,
|
|
/*ExplicitArgs*/ nullptr,
|
|
Initializer, CandidateSet,
|
|
/*SuppressUserConversions=*/true);
|
|
else
|
|
S.AddOverloadCandidate(Constructor, FoundDecl,
|
|
Initializer, CandidateSet,
|
|
/*SuppressUserConversions=*/true);
|
|
}
|
|
}
|
|
}
|
|
if (T1RecordType && T1RecordType->getDecl()->isInvalidDecl())
|
|
return OR_No_Viable_Function;
|
|
|
|
const RecordType *T2RecordType = nullptr;
|
|
if ((T2RecordType = T2->getAs<RecordType>()) &&
|
|
!S.RequireCompleteType(Kind.getLocation(), T2, 0)) {
|
|
// The type we're converting from is a class type, enumerate its conversion
|
|
// functions.
|
|
CXXRecordDecl *T2RecordDecl = cast<CXXRecordDecl>(T2RecordType->getDecl());
|
|
|
|
std::pair<CXXRecordDecl::conversion_iterator,
|
|
CXXRecordDecl::conversion_iterator>
|
|
Conversions = T2RecordDecl->getVisibleConversionFunctions();
|
|
for (CXXRecordDecl::conversion_iterator
|
|
I = Conversions.first, E = Conversions.second; I != E; ++I) {
|
|
NamedDecl *D = *I;
|
|
CXXRecordDecl *ActingDC = cast<CXXRecordDecl>(D->getDeclContext());
|
|
if (isa<UsingShadowDecl>(D))
|
|
D = cast<UsingShadowDecl>(D)->getTargetDecl();
|
|
|
|
FunctionTemplateDecl *ConvTemplate = dyn_cast<FunctionTemplateDecl>(D);
|
|
CXXConversionDecl *Conv;
|
|
if (ConvTemplate)
|
|
Conv = cast<CXXConversionDecl>(ConvTemplate->getTemplatedDecl());
|
|
else
|
|
Conv = cast<CXXConversionDecl>(D);
|
|
|
|
// If the conversion function doesn't return a reference type,
|
|
// it can't be considered for this conversion unless we're allowed to
|
|
// consider rvalues.
|
|
// FIXME: Do we need to make sure that we only consider conversion
|
|
// candidates with reference-compatible results? That might be needed to
|
|
// break recursion.
|
|
if ((AllowExplicitConvs || !Conv->isExplicit()) &&
|
|
(AllowRValues || Conv->getConversionType()->isLValueReferenceType())){
|
|
if (ConvTemplate)
|
|
S.AddTemplateConversionCandidate(ConvTemplate, I.getPair(),
|
|
ActingDC, Initializer,
|
|
DestType, CandidateSet,
|
|
/*AllowObjCConversionOnExplicit=*/
|
|
false);
|
|
else
|
|
S.AddConversionCandidate(Conv, I.getPair(), ActingDC,
|
|
Initializer, DestType, CandidateSet,
|
|
/*AllowObjCConversionOnExplicit=*/false);
|
|
}
|
|
}
|
|
}
|
|
if (T2RecordType && T2RecordType->getDecl()->isInvalidDecl())
|
|
return OR_No_Viable_Function;
|
|
|
|
SourceLocation DeclLoc = Initializer->getLocStart();
|
|
|
|
// Perform overload resolution. If it fails, return the failed result.
|
|
OverloadCandidateSet::iterator Best;
|
|
if (OverloadingResult Result
|
|
= CandidateSet.BestViableFunction(S, DeclLoc, Best, true))
|
|
return Result;
|
|
|
|
FunctionDecl *Function = Best->Function;
|
|
// This is the overload that will be used for this initialization step if we
|
|
// use this initialization. Mark it as referenced.
|
|
Function->setReferenced();
|
|
|
|
// Compute the returned type of the conversion.
|
|
if (isa<CXXConversionDecl>(Function))
|
|
T2 = Function->getReturnType();
|
|
else
|
|
T2 = cv1T1;
|
|
|
|
// Add the user-defined conversion step.
|
|
bool HadMultipleCandidates = (CandidateSet.size() > 1);
|
|
Sequence.AddUserConversionStep(Function, Best->FoundDecl,
|
|
T2.getNonLValueExprType(S.Context),
|
|
HadMultipleCandidates);
|
|
|
|
// Determine whether we need to perform derived-to-base or
|
|
// cv-qualification adjustments.
|
|
ExprValueKind VK = VK_RValue;
|
|
if (T2->isLValueReferenceType())
|
|
VK = VK_LValue;
|
|
else if (const RValueReferenceType *RRef = T2->getAs<RValueReferenceType>())
|
|
VK = RRef->getPointeeType()->isFunctionType() ? VK_LValue : VK_XValue;
|
|
|
|
bool NewDerivedToBase = false;
|
|
bool NewObjCConversion = false;
|
|
bool NewObjCLifetimeConversion = false;
|
|
Sema::ReferenceCompareResult NewRefRelationship
|
|
= S.CompareReferenceRelationship(DeclLoc, T1,
|
|
T2.getNonLValueExprType(S.Context),
|
|
NewDerivedToBase, NewObjCConversion,
|
|
NewObjCLifetimeConversion);
|
|
if (NewRefRelationship == Sema::Ref_Incompatible) {
|
|
// If the type we've converted to is not reference-related to the
|
|
// type we're looking for, then there is another conversion step
|
|
// we need to perform to produce a temporary of the right type
|
|
// that we'll be binding to.
|
|
ImplicitConversionSequence ICS;
|
|
ICS.setStandard();
|
|
ICS.Standard = Best->FinalConversion;
|
|
T2 = ICS.Standard.getToType(2);
|
|
Sequence.AddConversionSequenceStep(ICS, T2);
|
|
} else if (NewDerivedToBase)
|
|
Sequence.AddDerivedToBaseCastStep(
|
|
S.Context.getQualifiedType(T1,
|
|
T2.getNonReferenceType().getQualifiers()),
|
|
VK);
|
|
else if (NewObjCConversion)
|
|
Sequence.AddObjCObjectConversionStep(
|
|
S.Context.getQualifiedType(T1,
|
|
T2.getNonReferenceType().getQualifiers()));
|
|
|
|
if (cv1T1.getQualifiers() != T2.getNonReferenceType().getQualifiers())
|
|
Sequence.AddQualificationConversionStep(cv1T1, VK);
|
|
|
|
Sequence.AddReferenceBindingStep(cv1T1, !T2->isReferenceType());
|
|
return OR_Success;
|
|
}
|
|
|
|
static void CheckCXX98CompatAccessibleCopy(Sema &S,
|
|
const InitializedEntity &Entity,
|
|
Expr *CurInitExpr);
|
|
|
|
/// \brief Attempt reference initialization (C++0x [dcl.init.ref])
|
|
static void TryReferenceInitialization(Sema &S,
|
|
const InitializedEntity &Entity,
|
|
const InitializationKind &Kind,
|
|
Expr *Initializer,
|
|
InitializationSequence &Sequence) {
|
|
QualType DestType = Entity.getType();
|
|
QualType cv1T1 = DestType->getAs<ReferenceType>()->getPointeeType();
|
|
Qualifiers T1Quals;
|
|
QualType T1 = S.Context.getUnqualifiedArrayType(cv1T1, T1Quals);
|
|
QualType cv2T2 = Initializer->getType();
|
|
Qualifiers T2Quals;
|
|
QualType T2 = S.Context.getUnqualifiedArrayType(cv2T2, T2Quals);
|
|
|
|
// If the initializer is the address of an overloaded function, try
|
|
// to resolve the overloaded function. If all goes well, T2 is the
|
|
// type of the resulting function.
|
|
if (ResolveOverloadedFunctionForReferenceBinding(S, Initializer, cv2T2, T2,
|
|
T1, Sequence))
|
|
return;
|
|
|
|
// Delegate everything else to a subfunction.
|
|
TryReferenceInitializationCore(S, Entity, Kind, Initializer, cv1T1, T1,
|
|
T1Quals, cv2T2, T2, T2Quals, Sequence);
|
|
}
|
|
|
|
/// Converts the target of reference initialization so that it has the
|
|
/// appropriate qualifiers and value kind.
|
|
///
|
|
/// In this case, 'x' is an 'int' lvalue, but it needs to be 'const int'.
|
|
/// \code
|
|
/// int x;
|
|
/// const int &r = x;
|
|
/// \endcode
|
|
///
|
|
/// In this case the reference is binding to a bitfield lvalue, which isn't
|
|
/// valid. Perform a load to create a lifetime-extended temporary instead.
|
|
/// \code
|
|
/// const int &r = someStruct.bitfield;
|
|
/// \endcode
|
|
static ExprValueKind
|
|
convertQualifiersAndValueKindIfNecessary(Sema &S,
|
|
InitializationSequence &Sequence,
|
|
Expr *Initializer,
|
|
QualType cv1T1,
|
|
Qualifiers T1Quals,
|
|
Qualifiers T2Quals,
|
|
bool IsLValueRef) {
|
|
bool IsNonAddressableType = Initializer->refersToBitField() ||
|
|
Initializer->refersToVectorElement();
|
|
|
|
if (IsNonAddressableType) {
|
|
// C++11 [dcl.init.ref]p5: [...] Otherwise, the reference shall be an
|
|
// lvalue reference to a non-volatile const type, or the reference shall be
|
|
// an rvalue reference.
|
|
//
|
|
// If not, we can't make a temporary and bind to that. Give up and allow the
|
|
// error to be diagnosed later.
|
|
if (IsLValueRef && (!T1Quals.hasConst() || T1Quals.hasVolatile())) {
|
|
assert(Initializer->isGLValue());
|
|
return Initializer->getValueKind();
|
|
}
|
|
|
|
// Force a load so we can materialize a temporary.
|
|
Sequence.AddLValueToRValueStep(cv1T1.getUnqualifiedType());
|
|
return VK_RValue;
|
|
}
|
|
|
|
if (T1Quals != T2Quals) {
|
|
Sequence.AddQualificationConversionStep(cv1T1,
|
|
Initializer->getValueKind());
|
|
}
|
|
|
|
return Initializer->getValueKind();
|
|
}
|
|
|
|
|
|
/// \brief Reference initialization without resolving overloaded functions.
|
|
static void TryReferenceInitializationCore(Sema &S,
|
|
const InitializedEntity &Entity,
|
|
const InitializationKind &Kind,
|
|
Expr *Initializer,
|
|
QualType cv1T1, QualType T1,
|
|
Qualifiers T1Quals,
|
|
QualType cv2T2, QualType T2,
|
|
Qualifiers T2Quals,
|
|
InitializationSequence &Sequence) {
|
|
QualType DestType = Entity.getType();
|
|
SourceLocation DeclLoc = Initializer->getLocStart();
|
|
// Compute some basic properties of the types and the initializer.
|
|
bool isLValueRef = DestType->isLValueReferenceType();
|
|
bool isRValueRef = !isLValueRef;
|
|
bool DerivedToBase = false;
|
|
bool ObjCConversion = false;
|
|
bool ObjCLifetimeConversion = false;
|
|
Expr::Classification InitCategory = Initializer->Classify(S.Context);
|
|
Sema::ReferenceCompareResult RefRelationship
|
|
= S.CompareReferenceRelationship(DeclLoc, cv1T1, cv2T2, DerivedToBase,
|
|
ObjCConversion, ObjCLifetimeConversion);
|
|
|
|
// C++0x [dcl.init.ref]p5:
|
|
// A reference to type "cv1 T1" is initialized by an expression of type
|
|
// "cv2 T2" as follows:
|
|
//
|
|
// - If the reference is an lvalue reference and the initializer
|
|
// expression
|
|
// Note the analogous bullet points for rvalue refs to functions. Because
|
|
// there are no function rvalues in C++, rvalue refs to functions are treated
|
|
// like lvalue refs.
|
|
OverloadingResult ConvOvlResult = OR_Success;
|
|
bool T1Function = T1->isFunctionType();
|
|
if (isLValueRef || T1Function) {
|
|
if (InitCategory.isLValue() &&
|
|
(RefRelationship >= Sema::Ref_Compatible_With_Added_Qualification ||
|
|
(Kind.isCStyleOrFunctionalCast() &&
|
|
RefRelationship == Sema::Ref_Related))) {
|
|
// - is an lvalue (but is not a bit-field), and "cv1 T1" is
|
|
// reference-compatible with "cv2 T2," or
|
|
//
|
|
// Per C++ [over.best.ics]p2, we don't diagnose whether the lvalue is a
|
|
// bit-field when we're determining whether the reference initialization
|
|
// can occur. However, we do pay attention to whether it is a bit-field
|
|
// to decide whether we're actually binding to a temporary created from
|
|
// the bit-field.
|
|
if (DerivedToBase)
|
|
Sequence.AddDerivedToBaseCastStep(
|
|
S.Context.getQualifiedType(T1, T2Quals),
|
|
VK_LValue);
|
|
else if (ObjCConversion)
|
|
Sequence.AddObjCObjectConversionStep(
|
|
S.Context.getQualifiedType(T1, T2Quals));
|
|
|
|
ExprValueKind ValueKind =
|
|
convertQualifiersAndValueKindIfNecessary(S, Sequence, Initializer,
|
|
cv1T1, T1Quals, T2Quals,
|
|
isLValueRef);
|
|
Sequence.AddReferenceBindingStep(cv1T1, ValueKind == VK_RValue);
|
|
return;
|
|
}
|
|
|
|
// - has a class type (i.e., T2 is a class type), where T1 is not
|
|
// reference-related to T2, and can be implicitly converted to an
|
|
// lvalue of type "cv3 T3," where "cv1 T1" is reference-compatible
|
|
// with "cv3 T3" (this conversion is selected by enumerating the
|
|
// applicable conversion functions (13.3.1.6) and choosing the best
|
|
// one through overload resolution (13.3)),
|
|
// If we have an rvalue ref to function type here, the rhs must be
|
|
// an rvalue. DR1287 removed the "implicitly" here.
|
|
if (RefRelationship == Sema::Ref_Incompatible && T2->isRecordType() &&
|
|
(isLValueRef || InitCategory.isRValue())) {
|
|
ConvOvlResult = TryRefInitWithConversionFunction(
|
|
S, Entity, Kind, Initializer, /*AllowRValues*/isRValueRef, Sequence);
|
|
if (ConvOvlResult == OR_Success)
|
|
return;
|
|
if (ConvOvlResult != OR_No_Viable_Function)
|
|
Sequence.SetOverloadFailure(
|
|
InitializationSequence::FK_ReferenceInitOverloadFailed,
|
|
ConvOvlResult);
|
|
}
|
|
}
|
|
|
|
// - Otherwise, the reference shall be an lvalue reference to a
|
|
// non-volatile const type (i.e., cv1 shall be const), or the reference
|
|
// shall be an rvalue reference.
|
|
if (isLValueRef && !(T1Quals.hasConst() && !T1Quals.hasVolatile())) {
|
|
if (S.Context.getCanonicalType(T2) == S.Context.OverloadTy)
|
|
Sequence.SetFailed(InitializationSequence::FK_AddressOfOverloadFailed);
|
|
else if (ConvOvlResult && !Sequence.getFailedCandidateSet().empty())
|
|
Sequence.SetOverloadFailure(
|
|
InitializationSequence::FK_ReferenceInitOverloadFailed,
|
|
ConvOvlResult);
|
|
else
|
|
Sequence.SetFailed(InitCategory.isLValue()
|
|
? (RefRelationship == Sema::Ref_Related
|
|
? InitializationSequence::FK_ReferenceInitDropsQualifiers
|
|
: InitializationSequence::FK_NonConstLValueReferenceBindingToUnrelated)
|
|
: InitializationSequence::FK_NonConstLValueReferenceBindingToTemporary);
|
|
|
|
return;
|
|
}
|
|
|
|
// - If the initializer expression
|
|
// - is an xvalue, class prvalue, array prvalue, or function lvalue and
|
|
// "cv1 T1" is reference-compatible with "cv2 T2"
|
|
// Note: functions are handled below.
|
|
if (!T1Function &&
|
|
(RefRelationship >= Sema::Ref_Compatible_With_Added_Qualification ||
|
|
(Kind.isCStyleOrFunctionalCast() &&
|
|
RefRelationship == Sema::Ref_Related)) &&
|
|
(InitCategory.isXValue() ||
|
|
(InitCategory.isPRValue() && T2->isRecordType()) ||
|
|
(InitCategory.isPRValue() && T2->isArrayType()))) {
|
|
ExprValueKind ValueKind = InitCategory.isXValue()? VK_XValue : VK_RValue;
|
|
if (InitCategory.isPRValue() && T2->isRecordType()) {
|
|
// The corresponding bullet in C++03 [dcl.init.ref]p5 gives the
|
|
// compiler the freedom to perform a copy here or bind to the
|
|
// object, while C++0x requires that we bind directly to the
|
|
// object. Hence, we always bind to the object without making an
|
|
// extra copy. However, in C++03 requires that we check for the
|
|
// presence of a suitable copy constructor:
|
|
//
|
|
// The constructor that would be used to make the copy shall
|
|
// be callable whether or not the copy is actually done.
|
|
if (!S.getLangOpts().CPlusPlus11 && !S.getLangOpts().MicrosoftExt)
|
|
Sequence.AddExtraneousCopyToTemporary(cv2T2);
|
|
else if (S.getLangOpts().CPlusPlus11)
|
|
CheckCXX98CompatAccessibleCopy(S, Entity, Initializer);
|
|
}
|
|
|
|
if (DerivedToBase)
|
|
Sequence.AddDerivedToBaseCastStep(S.Context.getQualifiedType(T1, T2Quals),
|
|
ValueKind);
|
|
else if (ObjCConversion)
|
|
Sequence.AddObjCObjectConversionStep(
|
|
S.Context.getQualifiedType(T1, T2Quals));
|
|
|
|
ValueKind = convertQualifiersAndValueKindIfNecessary(S, Sequence,
|
|
Initializer, cv1T1,
|
|
T1Quals, T2Quals,
|
|
isLValueRef);
|
|
|
|
Sequence.AddReferenceBindingStep(cv1T1, ValueKind == VK_RValue);
|
|
return;
|
|
}
|
|
|
|
// - has a class type (i.e., T2 is a class type), where T1 is not
|
|
// reference-related to T2, and can be implicitly converted to an
|
|
// xvalue, class prvalue, or function lvalue of type "cv3 T3",
|
|
// where "cv1 T1" is reference-compatible with "cv3 T3",
|
|
//
|
|
// DR1287 removes the "implicitly" here.
|
|
if (T2->isRecordType()) {
|
|
if (RefRelationship == Sema::Ref_Incompatible) {
|
|
ConvOvlResult = TryRefInitWithConversionFunction(
|
|
S, Entity, Kind, Initializer, /*AllowRValues*/true, Sequence);
|
|
if (ConvOvlResult)
|
|
Sequence.SetOverloadFailure(
|
|
InitializationSequence::FK_ReferenceInitOverloadFailed,
|
|
ConvOvlResult);
|
|
|
|
return;
|
|
}
|
|
|
|
if ((RefRelationship == Sema::Ref_Compatible ||
|
|
RefRelationship == Sema::Ref_Compatible_With_Added_Qualification) &&
|
|
isRValueRef && InitCategory.isLValue()) {
|
|
Sequence.SetFailed(
|
|
InitializationSequence::FK_RValueReferenceBindingToLValue);
|
|
return;
|
|
}
|
|
|
|
Sequence.SetFailed(InitializationSequence::FK_ReferenceInitDropsQualifiers);
|
|
return;
|
|
}
|
|
|
|
// - Otherwise, a temporary of type "cv1 T1" is created and initialized
|
|
// from the initializer expression using the rules for a non-reference
|
|
// copy-initialization (8.5). The reference is then bound to the
|
|
// temporary. [...]
|
|
|
|
InitializedEntity TempEntity = InitializedEntity::InitializeTemporary(cv1T1);
|
|
|
|
// FIXME: Why do we use an implicit conversion here rather than trying
|
|
// copy-initialization?
|
|
ImplicitConversionSequence ICS
|
|
= S.TryImplicitConversion(Initializer, TempEntity.getType(),
|
|
/*SuppressUserConversions=*/false,
|
|
/*AllowExplicit=*/false,
|
|
/*FIXME:InOverloadResolution=*/false,
|
|
/*CStyle=*/Kind.isCStyleOrFunctionalCast(),
|
|
/*AllowObjCWritebackConversion=*/false);
|
|
|
|
if (ICS.isBad()) {
|
|
// FIXME: Use the conversion function set stored in ICS to turn
|
|
// this into an overloading ambiguity diagnostic. However, we need
|
|
// to keep that set as an OverloadCandidateSet rather than as some
|
|
// other kind of set.
|
|
if (ConvOvlResult && !Sequence.getFailedCandidateSet().empty())
|
|
Sequence.SetOverloadFailure(
|
|
InitializationSequence::FK_ReferenceInitOverloadFailed,
|
|
ConvOvlResult);
|
|
else if (S.Context.getCanonicalType(T2) == S.Context.OverloadTy)
|
|
Sequence.SetFailed(InitializationSequence::FK_AddressOfOverloadFailed);
|
|
else
|
|
Sequence.SetFailed(InitializationSequence::FK_ReferenceInitFailed);
|
|
return;
|
|
} else {
|
|
Sequence.AddConversionSequenceStep(ICS, TempEntity.getType());
|
|
}
|
|
|
|
// [...] If T1 is reference-related to T2, cv1 must be the
|
|
// same cv-qualification as, or greater cv-qualification
|
|
// than, cv2; otherwise, the program is ill-formed.
|
|
unsigned T1CVRQuals = T1Quals.getCVRQualifiers();
|
|
unsigned T2CVRQuals = T2Quals.getCVRQualifiers();
|
|
if (RefRelationship == Sema::Ref_Related &&
|
|
(T1CVRQuals | T2CVRQuals) != T1CVRQuals) {
|
|
Sequence.SetFailed(InitializationSequence::FK_ReferenceInitDropsQualifiers);
|
|
return;
|
|
}
|
|
|
|
// [...] If T1 is reference-related to T2 and the reference is an rvalue
|
|
// reference, the initializer expression shall not be an lvalue.
|
|
if (RefRelationship >= Sema::Ref_Related && !isLValueRef &&
|
|
InitCategory.isLValue()) {
|
|
Sequence.SetFailed(
|
|
InitializationSequence::FK_RValueReferenceBindingToLValue);
|
|
return;
|
|
}
|
|
|
|
Sequence.AddReferenceBindingStep(cv1T1, /*bindingTemporary=*/true);
|
|
return;
|
|
}
|
|
|
|
/// \brief Attempt character array initialization from a string literal
|
|
/// (C++ [dcl.init.string], C99 6.7.8).
|
|
static void TryStringLiteralInitialization(Sema &S,
|
|
const InitializedEntity &Entity,
|
|
const InitializationKind &Kind,
|
|
Expr *Initializer,
|
|
InitializationSequence &Sequence) {
|
|
Sequence.AddStringInitStep(Entity.getType());
|
|
}
|
|
|
|
/// \brief Attempt value initialization (C++ [dcl.init]p7).
|
|
static void TryValueInitialization(Sema &S,
|
|
const InitializedEntity &Entity,
|
|
const InitializationKind &Kind,
|
|
InitializationSequence &Sequence,
|
|
InitListExpr *InitList) {
|
|
assert((!InitList || InitList->getNumInits() == 0) &&
|
|
"Shouldn't use value-init for non-empty init lists");
|
|
|
|
// C++98 [dcl.init]p5, C++11 [dcl.init]p7:
|
|
//
|
|
// To value-initialize an object of type T means:
|
|
QualType T = Entity.getType();
|
|
|
|
// -- if T is an array type, then each element is value-initialized;
|
|
T = S.Context.getBaseElementType(T);
|
|
|
|
if (const RecordType *RT = T->getAs<RecordType>()) {
|
|
if (CXXRecordDecl *ClassDecl = dyn_cast<CXXRecordDecl>(RT->getDecl())) {
|
|
bool NeedZeroInitialization = true;
|
|
if (!S.getLangOpts().CPlusPlus11) {
|
|
// C++98:
|
|
// -- if T is a class type (clause 9) with a user-declared constructor
|
|
// (12.1), then the default constructor for T is called (and the
|
|
// initialization is ill-formed if T has no accessible default
|
|
// constructor);
|
|
if (ClassDecl->hasUserDeclaredConstructor())
|
|
NeedZeroInitialization = false;
|
|
} else {
|
|
// C++11:
|
|
// -- if T is a class type (clause 9) with either no default constructor
|
|
// (12.1 [class.ctor]) or a default constructor that is user-provided
|
|
// or deleted, then the object is default-initialized;
|
|
CXXConstructorDecl *CD = S.LookupDefaultConstructor(ClassDecl);
|
|
if (!CD || !CD->getCanonicalDecl()->isDefaulted() || CD->isDeleted())
|
|
NeedZeroInitialization = false;
|
|
}
|
|
|
|
// -- if T is a (possibly cv-qualified) non-union class type without a
|
|
// user-provided or deleted default constructor, then the object is
|
|
// zero-initialized and, if T has a non-trivial default constructor,
|
|
// default-initialized;
|
|
// The 'non-union' here was removed by DR1502. The 'non-trivial default
|
|
// constructor' part was removed by DR1507.
|
|
if (NeedZeroInitialization)
|
|
Sequence.AddZeroInitializationStep(Entity.getType());
|
|
|
|
// C++03:
|
|
// -- if T is a non-union class type without a user-declared constructor,
|
|
// then every non-static data member and base class component of T is
|
|
// value-initialized;
|
|
// [...] A program that calls for [...] value-initialization of an
|
|
// entity of reference type is ill-formed.
|
|
//
|
|
// C++11 doesn't need this handling, because value-initialization does not
|
|
// occur recursively there, and the implicit default constructor is
|
|
// defined as deleted in the problematic cases.
|
|
if (!S.getLangOpts().CPlusPlus11 &&
|
|
ClassDecl->hasUninitializedReferenceMember()) {
|
|
Sequence.SetFailed(InitializationSequence::FK_TooManyInitsForReference);
|
|
return;
|
|
}
|
|
|
|
// If this is list-value-initialization, pass the empty init list on when
|
|
// building the constructor call. This affects the semantics of a few
|
|
// things (such as whether an explicit default constructor can be called).
|
|
Expr *InitListAsExpr = InitList;
|
|
MultiExprArg Args(&InitListAsExpr, InitList ? 1 : 0);
|
|
bool InitListSyntax = InitList;
|
|
|
|
return TryConstructorInitialization(S, Entity, Kind, Args, T, Sequence,
|
|
InitListSyntax);
|
|
}
|
|
}
|
|
|
|
Sequence.AddZeroInitializationStep(Entity.getType());
|
|
}
|
|
|
|
/// \brief Attempt default initialization (C++ [dcl.init]p6).
|
|
static void TryDefaultInitialization(Sema &S,
|
|
const InitializedEntity &Entity,
|
|
const InitializationKind &Kind,
|
|
InitializationSequence &Sequence) {
|
|
assert(Kind.getKind() == InitializationKind::IK_Default);
|
|
|
|
// C++ [dcl.init]p6:
|
|
// To default-initialize an object of type T means:
|
|
// - if T is an array type, each element is default-initialized;
|
|
QualType DestType = S.Context.getBaseElementType(Entity.getType());
|
|
|
|
// - if T is a (possibly cv-qualified) class type (Clause 9), the default
|
|
// constructor for T is called (and the initialization is ill-formed if
|
|
// T has no accessible default constructor);
|
|
if (DestType->isRecordType() && S.getLangOpts().CPlusPlus) {
|
|
TryConstructorInitialization(S, Entity, Kind, None, DestType, Sequence);
|
|
return;
|
|
}
|
|
|
|
// - otherwise, no initialization is performed.
|
|
|
|
// If a program calls for the default initialization of an object of
|
|
// a const-qualified type T, T shall be a class type with a user-provided
|
|
// default constructor.
|
|
if (DestType.isConstQualified() && S.getLangOpts().CPlusPlus) {
|
|
Sequence.SetFailed(InitializationSequence::FK_DefaultInitOfConst);
|
|
return;
|
|
}
|
|
|
|
// If the destination type has a lifetime property, zero-initialize it.
|
|
if (DestType.getQualifiers().hasObjCLifetime()) {
|
|
Sequence.AddZeroInitializationStep(Entity.getType());
|
|
return;
|
|
}
|
|
}
|
|
|
|
/// \brief Attempt a user-defined conversion between two types (C++ [dcl.init]),
|
|
/// which enumerates all conversion functions and performs overload resolution
|
|
/// to select the best.
|
|
static void TryUserDefinedConversion(Sema &S,
|
|
QualType DestType,
|
|
const InitializationKind &Kind,
|
|
Expr *Initializer,
|
|
InitializationSequence &Sequence,
|
|
bool TopLevelOfInitList) {
|
|
assert(!DestType->isReferenceType() && "References are handled elsewhere");
|
|
QualType SourceType = Initializer->getType();
|
|
assert((DestType->isRecordType() || SourceType->isRecordType()) &&
|
|
"Must have a class type to perform a user-defined conversion");
|
|
|
|
// Build the candidate set directly in the initialization sequence
|
|
// structure, so that it will persist if we fail.
|
|
OverloadCandidateSet &CandidateSet = Sequence.getFailedCandidateSet();
|
|
CandidateSet.clear();
|
|
|
|
// Determine whether we are allowed to call explicit constructors or
|
|
// explicit conversion operators.
|
|
bool AllowExplicit = Kind.AllowExplicit();
|
|
|
|
if (const RecordType *DestRecordType = DestType->getAs<RecordType>()) {
|
|
// The type we're converting to is a class type. Enumerate its constructors
|
|
// to see if there is a suitable conversion.
|
|
CXXRecordDecl *DestRecordDecl
|
|
= cast<CXXRecordDecl>(DestRecordType->getDecl());
|
|
|
|
// Try to complete the type we're converting to.
|
|
if (!S.RequireCompleteType(Kind.getLocation(), DestType, 0)) {
|
|
DeclContext::lookup_result R = S.LookupConstructors(DestRecordDecl);
|
|
// The container holding the constructors can under certain conditions
|
|
// be changed while iterating. To be safe we copy the lookup results
|
|
// to a new container.
|
|
SmallVector<NamedDecl*, 8> CopyOfCon(R.begin(), R.end());
|
|
for (SmallVectorImpl<NamedDecl *>::iterator
|
|
Con = CopyOfCon.begin(), ConEnd = CopyOfCon.end();
|
|
Con != ConEnd; ++Con) {
|
|
NamedDecl *D = *Con;
|
|
DeclAccessPair FoundDecl = DeclAccessPair::make(D, D->getAccess());
|
|
|
|
// Find the constructor (which may be a template).
|
|
CXXConstructorDecl *Constructor = nullptr;
|
|
FunctionTemplateDecl *ConstructorTmpl
|
|
= dyn_cast<FunctionTemplateDecl>(D);
|
|
if (ConstructorTmpl)
|
|
Constructor = cast<CXXConstructorDecl>(
|
|
ConstructorTmpl->getTemplatedDecl());
|
|
else
|
|
Constructor = cast<CXXConstructorDecl>(D);
|
|
|
|
if (!Constructor->isInvalidDecl() &&
|
|
Constructor->isConvertingConstructor(AllowExplicit)) {
|
|
if (ConstructorTmpl)
|
|
S.AddTemplateOverloadCandidate(ConstructorTmpl, FoundDecl,
|
|
/*ExplicitArgs*/ nullptr,
|
|
Initializer, CandidateSet,
|
|
/*SuppressUserConversions=*/true);
|
|
else
|
|
S.AddOverloadCandidate(Constructor, FoundDecl,
|
|
Initializer, CandidateSet,
|
|
/*SuppressUserConversions=*/true);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
SourceLocation DeclLoc = Initializer->getLocStart();
|
|
|
|
if (const RecordType *SourceRecordType = SourceType->getAs<RecordType>()) {
|
|
// The type we're converting from is a class type, enumerate its conversion
|
|
// functions.
|
|
|
|
// We can only enumerate the conversion functions for a complete type; if
|
|
// the type isn't complete, simply skip this step.
|
|
if (!S.RequireCompleteType(DeclLoc, SourceType, 0)) {
|
|
CXXRecordDecl *SourceRecordDecl
|
|
= cast<CXXRecordDecl>(SourceRecordType->getDecl());
|
|
|
|
std::pair<CXXRecordDecl::conversion_iterator,
|
|
CXXRecordDecl::conversion_iterator>
|
|
Conversions = SourceRecordDecl->getVisibleConversionFunctions();
|
|
for (CXXRecordDecl::conversion_iterator
|
|
I = Conversions.first, E = Conversions.second; I != E; ++I) {
|
|
NamedDecl *D = *I;
|
|
CXXRecordDecl *ActingDC = cast<CXXRecordDecl>(D->getDeclContext());
|
|
if (isa<UsingShadowDecl>(D))
|
|
D = cast<UsingShadowDecl>(D)->getTargetDecl();
|
|
|
|
FunctionTemplateDecl *ConvTemplate = dyn_cast<FunctionTemplateDecl>(D);
|
|
CXXConversionDecl *Conv;
|
|
if (ConvTemplate)
|
|
Conv = cast<CXXConversionDecl>(ConvTemplate->getTemplatedDecl());
|
|
else
|
|
Conv = cast<CXXConversionDecl>(D);
|
|
|
|
if (AllowExplicit || !Conv->isExplicit()) {
|
|
if (ConvTemplate)
|
|
S.AddTemplateConversionCandidate(ConvTemplate, I.getPair(),
|
|
ActingDC, Initializer, DestType,
|
|
CandidateSet, AllowExplicit);
|
|
else
|
|
S.AddConversionCandidate(Conv, I.getPair(), ActingDC,
|
|
Initializer, DestType, CandidateSet,
|
|
AllowExplicit);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// Perform overload resolution. If it fails, return the failed result.
|
|
OverloadCandidateSet::iterator Best;
|
|
if (OverloadingResult Result
|
|
= CandidateSet.BestViableFunction(S, DeclLoc, Best, true)) {
|
|
Sequence.SetOverloadFailure(
|
|
InitializationSequence::FK_UserConversionOverloadFailed,
|
|
Result);
|
|
return;
|
|
}
|
|
|
|
FunctionDecl *Function = Best->Function;
|
|
Function->setReferenced();
|
|
bool HadMultipleCandidates = (CandidateSet.size() > 1);
|
|
|
|
if (isa<CXXConstructorDecl>(Function)) {
|
|
// Add the user-defined conversion step. Any cv-qualification conversion is
|
|
// subsumed by the initialization. Per DR5, the created temporary is of the
|
|
// cv-unqualified type of the destination.
|
|
Sequence.AddUserConversionStep(Function, Best->FoundDecl,
|
|
DestType.getUnqualifiedType(),
|
|
HadMultipleCandidates);
|
|
return;
|
|
}
|
|
|
|
// Add the user-defined conversion step that calls the conversion function.
|
|
QualType ConvType = Function->getCallResultType();
|
|
if (ConvType->getAs<RecordType>()) {
|
|
// If we're converting to a class type, there may be an copy of
|
|
// the resulting temporary object (possible to create an object of
|
|
// a base class type). That copy is not a separate conversion, so
|
|
// we just make a note of the actual destination type (possibly a
|
|
// base class of the type returned by the conversion function) and
|
|
// let the user-defined conversion step handle the conversion.
|
|
Sequence.AddUserConversionStep(Function, Best->FoundDecl, DestType,
|
|
HadMultipleCandidates);
|
|
return;
|
|
}
|
|
|
|
Sequence.AddUserConversionStep(Function, Best->FoundDecl, ConvType,
|
|
HadMultipleCandidates);
|
|
|
|
// If the conversion following the call to the conversion function
|
|
// is interesting, add it as a separate step.
|
|
if (Best->FinalConversion.First || Best->FinalConversion.Second ||
|
|
Best->FinalConversion.Third) {
|
|
ImplicitConversionSequence ICS;
|
|
ICS.setStandard();
|
|
ICS.Standard = Best->FinalConversion;
|
|
Sequence.AddConversionSequenceStep(ICS, DestType, TopLevelOfInitList);
|
|
}
|
|
}
|
|
|
|
/// An egregious hack for compatibility with libstdc++-4.2: in <tr1/hashtable>,
|
|
/// a function with a pointer return type contains a 'return false;' statement.
|
|
/// In C++11, 'false' is not a null pointer, so this breaks the build of any
|
|
/// code using that header.
|
|
///
|
|
/// Work around this by treating 'return false;' as zero-initializing the result
|
|
/// if it's used in a pointer-returning function in a system header.
|
|
static bool isLibstdcxxPointerReturnFalseHack(Sema &S,
|
|
const InitializedEntity &Entity,
|
|
const Expr *Init) {
|
|
return S.getLangOpts().CPlusPlus11 &&
|
|
Entity.getKind() == InitializedEntity::EK_Result &&
|
|
Entity.getType()->isPointerType() &&
|
|
isa<CXXBoolLiteralExpr>(Init) &&
|
|
!cast<CXXBoolLiteralExpr>(Init)->getValue() &&
|
|
S.getSourceManager().isInSystemHeader(Init->getExprLoc());
|
|
}
|
|
|
|
/// The non-zero enum values here are indexes into diagnostic alternatives.
|
|
enum InvalidICRKind { IIK_okay, IIK_nonlocal, IIK_nonscalar };
|
|
|
|
/// Determines whether this expression is an acceptable ICR source.
|
|
static InvalidICRKind isInvalidICRSource(ASTContext &C, Expr *e,
|
|
bool isAddressOf, bool &isWeakAccess) {
|
|
// Skip parens.
|
|
e = e->IgnoreParens();
|
|
|
|
// Skip address-of nodes.
|
|
if (UnaryOperator *op = dyn_cast<UnaryOperator>(e)) {
|
|
if (op->getOpcode() == UO_AddrOf)
|
|
return isInvalidICRSource(C, op->getSubExpr(), /*addressof*/ true,
|
|
isWeakAccess);
|
|
|
|
// Skip certain casts.
|
|
} else if (CastExpr *ce = dyn_cast<CastExpr>(e)) {
|
|
switch (ce->getCastKind()) {
|
|
case CK_Dependent:
|
|
case CK_BitCast:
|
|
case CK_LValueBitCast:
|
|
case CK_NoOp:
|
|
return isInvalidICRSource(C, ce->getSubExpr(), isAddressOf, isWeakAccess);
|
|
|
|
case CK_ArrayToPointerDecay:
|
|
return IIK_nonscalar;
|
|
|
|
case CK_NullToPointer:
|
|
return IIK_okay;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
|
|
// If we have a declaration reference, it had better be a local variable.
|
|
} else if (isa<DeclRefExpr>(e)) {
|
|
// set isWeakAccess to true, to mean that there will be an implicit
|
|
// load which requires a cleanup.
|
|
if (e->getType().getObjCLifetime() == Qualifiers::OCL_Weak)
|
|
isWeakAccess = true;
|
|
|
|
if (!isAddressOf) return IIK_nonlocal;
|
|
|
|
VarDecl *var = dyn_cast<VarDecl>(cast<DeclRefExpr>(e)->getDecl());
|
|
if (!var) return IIK_nonlocal;
|
|
|
|
return (var->hasLocalStorage() ? IIK_okay : IIK_nonlocal);
|
|
|
|
// If we have a conditional operator, check both sides.
|
|
} else if (ConditionalOperator *cond = dyn_cast<ConditionalOperator>(e)) {
|
|
if (InvalidICRKind iik = isInvalidICRSource(C, cond->getLHS(), isAddressOf,
|
|
isWeakAccess))
|
|
return iik;
|
|
|
|
return isInvalidICRSource(C, cond->getRHS(), isAddressOf, isWeakAccess);
|
|
|
|
// These are never scalar.
|
|
} else if (isa<ArraySubscriptExpr>(e)) {
|
|
return IIK_nonscalar;
|
|
|
|
// Otherwise, it needs to be a null pointer constant.
|
|
} else {
|
|
return (e->isNullPointerConstant(C, Expr::NPC_ValueDependentIsNull)
|
|
? IIK_okay : IIK_nonlocal);
|
|
}
|
|
|
|
return IIK_nonlocal;
|
|
}
|
|
|
|
/// Check whether the given expression is a valid operand for an
|
|
/// indirect copy/restore.
|
|
static void checkIndirectCopyRestoreSource(Sema &S, Expr *src) {
|
|
assert(src->isRValue());
|
|
bool isWeakAccess = false;
|
|
InvalidICRKind iik = isInvalidICRSource(S.Context, src, false, isWeakAccess);
|
|
// If isWeakAccess to true, there will be an implicit
|
|
// load which requires a cleanup.
|
|
if (S.getLangOpts().ObjCAutoRefCount && isWeakAccess)
|
|
S.ExprNeedsCleanups = true;
|
|
|
|
if (iik == IIK_okay) return;
|
|
|
|
S.Diag(src->getExprLoc(), diag::err_arc_nonlocal_writeback)
|
|
<< ((unsigned) iik - 1) // shift index into diagnostic explanations
|
|
<< src->getSourceRange();
|
|
}
|
|
|
|
/// \brief Determine whether we have compatible array types for the
|
|
/// purposes of GNU by-copy array initialization.
|
|
static bool hasCompatibleArrayTypes(ASTContext &Context, const ArrayType *Dest,
|
|
const ArrayType *Source) {
|
|
// If the source and destination array types are equivalent, we're
|
|
// done.
|
|
if (Context.hasSameType(QualType(Dest, 0), QualType(Source, 0)))
|
|
return true;
|
|
|
|
// Make sure that the element types are the same.
|
|
if (!Context.hasSameType(Dest->getElementType(), Source->getElementType()))
|
|
return false;
|
|
|
|
// The only mismatch we allow is when the destination is an
|
|
// incomplete array type and the source is a constant array type.
|
|
return Source->isConstantArrayType() && Dest->isIncompleteArrayType();
|
|
}
|
|
|
|
static bool tryObjCWritebackConversion(Sema &S,
|
|
InitializationSequence &Sequence,
|
|
const InitializedEntity &Entity,
|
|
Expr *Initializer) {
|
|
bool ArrayDecay = false;
|
|
QualType ArgType = Initializer->getType();
|
|
QualType ArgPointee;
|
|
if (const ArrayType *ArgArrayType = S.Context.getAsArrayType(ArgType)) {
|
|
ArrayDecay = true;
|
|
ArgPointee = ArgArrayType->getElementType();
|
|
ArgType = S.Context.getPointerType(ArgPointee);
|
|
}
|
|
|
|
// Handle write-back conversion.
|
|
QualType ConvertedArgType;
|
|
if (!S.isObjCWritebackConversion(ArgType, Entity.getType(),
|
|
ConvertedArgType))
|
|
return false;
|
|
|
|
// We should copy unless we're passing to an argument explicitly
|
|
// marked 'out'.
|
|
bool ShouldCopy = true;
|
|
if (ParmVarDecl *param = cast_or_null<ParmVarDecl>(Entity.getDecl()))
|
|
ShouldCopy = (param->getObjCDeclQualifier() != ParmVarDecl::OBJC_TQ_Out);
|
|
|
|
// Do we need an lvalue conversion?
|
|
if (ArrayDecay || Initializer->isGLValue()) {
|
|
ImplicitConversionSequence ICS;
|
|
ICS.setStandard();
|
|
ICS.Standard.setAsIdentityConversion();
|
|
|
|
QualType ResultType;
|
|
if (ArrayDecay) {
|
|
ICS.Standard.First = ICK_Array_To_Pointer;
|
|
ResultType = S.Context.getPointerType(ArgPointee);
|
|
} else {
|
|
ICS.Standard.First = ICK_Lvalue_To_Rvalue;
|
|
ResultType = Initializer->getType().getNonLValueExprType(S.Context);
|
|
}
|
|
|
|
Sequence.AddConversionSequenceStep(ICS, ResultType);
|
|
}
|
|
|
|
Sequence.AddPassByIndirectCopyRestoreStep(Entity.getType(), ShouldCopy);
|
|
return true;
|
|
}
|
|
|
|
static bool TryOCLSamplerInitialization(Sema &S,
|
|
InitializationSequence &Sequence,
|
|
QualType DestType,
|
|
Expr *Initializer) {
|
|
if (!S.getLangOpts().OpenCL || !DestType->isSamplerT() ||
|
|
!Initializer->isIntegerConstantExpr(S.getASTContext()))
|
|
return false;
|
|
|
|
Sequence.AddOCLSamplerInitStep(DestType);
|
|
return true;
|
|
}
|
|
|
|
//
|
|
// OpenCL 1.2 spec, s6.12.10
|
|
//
|
|
// The event argument can also be used to associate the
|
|
// async_work_group_copy with a previous async copy allowing
|
|
// an event to be shared by multiple async copies; otherwise
|
|
// event should be zero.
|
|
//
|
|
static bool TryOCLZeroEventInitialization(Sema &S,
|
|
InitializationSequence &Sequence,
|
|
QualType DestType,
|
|
Expr *Initializer) {
|
|
if (!S.getLangOpts().OpenCL || !DestType->isEventT() ||
|
|
!Initializer->isIntegerConstantExpr(S.getASTContext()) ||
|
|
(Initializer->EvaluateKnownConstInt(S.getASTContext()) != 0))
|
|
return false;
|
|
|
|
Sequence.AddOCLZeroEventStep(DestType);
|
|
return true;
|
|
}
|
|
|
|
InitializationSequence::InitializationSequence(Sema &S,
|
|
const InitializedEntity &Entity,
|
|
const InitializationKind &Kind,
|
|
MultiExprArg Args,
|
|
bool TopLevelOfInitList)
|
|
: FailedCandidateSet(Kind.getLocation(), OverloadCandidateSet::CSK_Normal) {
|
|
InitializeFrom(S, Entity, Kind, Args, TopLevelOfInitList);
|
|
}
|
|
|
|
void InitializationSequence::InitializeFrom(Sema &S,
|
|
const InitializedEntity &Entity,
|
|
const InitializationKind &Kind,
|
|
MultiExprArg Args,
|
|
bool TopLevelOfInitList) {
|
|
ASTContext &Context = S.Context;
|
|
|
|
// Eliminate non-overload placeholder types in the arguments. We
|
|
// need to do this before checking whether types are dependent
|
|
// because lowering a pseudo-object expression might well give us
|
|
// something of dependent type.
|
|
for (unsigned I = 0, E = Args.size(); I != E; ++I)
|
|
if (Args[I]->getType()->isNonOverloadPlaceholderType()) {
|
|
// FIXME: should we be doing this here?
|
|
ExprResult result = S.CheckPlaceholderExpr(Args[I]);
|
|
if (result.isInvalid()) {
|
|
SetFailed(FK_PlaceholderType);
|
|
return;
|
|
}
|
|
Args[I] = result.get();
|
|
}
|
|
|
|
// C++0x [dcl.init]p16:
|
|
// The semantics of initializers are as follows. The destination type is
|
|
// the type of the object or reference being initialized and the source
|
|
// type is the type of the initializer expression. The source type is not
|
|
// defined when the initializer is a braced-init-list or when it is a
|
|
// parenthesized list of expressions.
|
|
QualType DestType = Entity.getType();
|
|
|
|
if (DestType->isDependentType() ||
|
|
Expr::hasAnyTypeDependentArguments(Args)) {
|
|
SequenceKind = DependentSequence;
|
|
return;
|
|
}
|
|
|
|
// Almost everything is a normal sequence.
|
|
setSequenceKind(NormalSequence);
|
|
|
|
QualType SourceType;
|
|
Expr *Initializer = nullptr;
|
|
if (Args.size() == 1) {
|
|
Initializer = Args[0];
|
|
if (S.getLangOpts().ObjC1) {
|
|
if (S.CheckObjCBridgeRelatedConversions(Initializer->getLocStart(),
|
|
DestType, Initializer->getType(),
|
|
Initializer) ||
|
|
S.ConversionToObjCStringLiteralCheck(DestType, Initializer))
|
|
Args[0] = Initializer;
|
|
}
|
|
if (!isa<InitListExpr>(Initializer))
|
|
SourceType = Initializer->getType();
|
|
}
|
|
|
|
// - If the initializer is a (non-parenthesized) braced-init-list, the
|
|
// object is list-initialized (8.5.4).
|
|
if (Kind.getKind() != InitializationKind::IK_Direct) {
|
|
if (InitListExpr *InitList = dyn_cast_or_null<InitListExpr>(Initializer)) {
|
|
TryListInitialization(S, Entity, Kind, InitList, *this);
|
|
return;
|
|
}
|
|
}
|
|
|
|
// - If the destination type is a reference type, see 8.5.3.
|
|
if (DestType->isReferenceType()) {
|
|
// C++0x [dcl.init.ref]p1:
|
|
// A variable declared to be a T& or T&&, that is, "reference to type T"
|
|
// (8.3.2), shall be initialized by an object, or function, of type T or
|
|
// by an object that can be converted into a T.
|
|
// (Therefore, multiple arguments are not permitted.)
|
|
if (Args.size() != 1)
|
|
SetFailed(FK_TooManyInitsForReference);
|
|
else
|
|
TryReferenceInitialization(S, Entity, Kind, Args[0], *this);
|
|
return;
|
|
}
|
|
|
|
// - If the initializer is (), the object is value-initialized.
|
|
if (Kind.getKind() == InitializationKind::IK_Value ||
|
|
(Kind.getKind() == InitializationKind::IK_Direct && Args.empty())) {
|
|
TryValueInitialization(S, Entity, Kind, *this);
|
|
return;
|
|
}
|
|
|
|
// Handle default initialization.
|
|
if (Kind.getKind() == InitializationKind::IK_Default) {
|
|
TryDefaultInitialization(S, Entity, Kind, *this);
|
|
return;
|
|
}
|
|
|
|
// - If the destination type is an array of characters, an array of
|
|
// char16_t, an array of char32_t, or an array of wchar_t, and the
|
|
// initializer is a string literal, see 8.5.2.
|
|
// - Otherwise, if the destination type is an array, the program is
|
|
// ill-formed.
|
|
if (const ArrayType *DestAT = Context.getAsArrayType(DestType)) {
|
|
if (Initializer && isa<VariableArrayType>(DestAT)) {
|
|
SetFailed(FK_VariableLengthArrayHasInitializer);
|
|
return;
|
|
}
|
|
|
|
if (Initializer) {
|
|
switch (IsStringInit(Initializer, DestAT, Context)) {
|
|
case SIF_None:
|
|
TryStringLiteralInitialization(S, Entity, Kind, Initializer, *this);
|
|
return;
|
|
case SIF_NarrowStringIntoWideChar:
|
|
SetFailed(FK_NarrowStringIntoWideCharArray);
|
|
return;
|
|
case SIF_WideStringIntoChar:
|
|
SetFailed(FK_WideStringIntoCharArray);
|
|
return;
|
|
case SIF_IncompatWideStringIntoWideChar:
|
|
SetFailed(FK_IncompatWideStringIntoWideChar);
|
|
return;
|
|
case SIF_Other:
|
|
break;
|
|
}
|
|
}
|
|
|
|
// Note: as an GNU C extension, we allow initialization of an
|
|
// array from a compound literal that creates an array of the same
|
|
// type, so long as the initializer has no side effects.
|
|
if (!S.getLangOpts().CPlusPlus && Initializer &&
|
|
isa<CompoundLiteralExpr>(Initializer->IgnoreParens()) &&
|
|
Initializer->getType()->isArrayType()) {
|
|
const ArrayType *SourceAT
|
|
= Context.getAsArrayType(Initializer->getType());
|
|
if (!hasCompatibleArrayTypes(S.Context, DestAT, SourceAT))
|
|
SetFailed(FK_ArrayTypeMismatch);
|
|
else if (Initializer->HasSideEffects(S.Context))
|
|
SetFailed(FK_NonConstantArrayInit);
|
|
else {
|
|
AddArrayInitStep(DestType);
|
|
}
|
|
}
|
|
// Note: as a GNU C++ extension, we allow list-initialization of a
|
|
// class member of array type from a parenthesized initializer list.
|
|
else if (S.getLangOpts().CPlusPlus &&
|
|
Entity.getKind() == InitializedEntity::EK_Member &&
|
|
Initializer && isa<InitListExpr>(Initializer)) {
|
|
TryListInitialization(S, Entity, Kind, cast<InitListExpr>(Initializer),
|
|
*this);
|
|
AddParenthesizedArrayInitStep(DestType);
|
|
} else if (DestAT->getElementType()->isCharType())
|
|
SetFailed(FK_ArrayNeedsInitListOrStringLiteral);
|
|
else if (IsWideCharCompatible(DestAT->getElementType(), Context))
|
|
SetFailed(FK_ArrayNeedsInitListOrWideStringLiteral);
|
|
else
|
|
SetFailed(FK_ArrayNeedsInitList);
|
|
|
|
return;
|
|
}
|
|
|
|
// Determine whether we should consider writeback conversions for
|
|
// Objective-C ARC.
|
|
bool allowObjCWritebackConversion = S.getLangOpts().ObjCAutoRefCount &&
|
|
Entity.isParameterKind();
|
|
|
|
// We're at the end of the line for C: it's either a write-back conversion
|
|
// or it's a C assignment. There's no need to check anything else.
|
|
if (!S.getLangOpts().CPlusPlus) {
|
|
// If allowed, check whether this is an Objective-C writeback conversion.
|
|
if (allowObjCWritebackConversion &&
|
|
tryObjCWritebackConversion(S, *this, Entity, Initializer)) {
|
|
return;
|
|
}
|
|
|
|
if (TryOCLSamplerInitialization(S, *this, DestType, Initializer))
|
|
return;
|
|
|
|
if (TryOCLZeroEventInitialization(S, *this, DestType, Initializer))
|
|
return;
|
|
|
|
// Handle initialization in C
|
|
AddCAssignmentStep(DestType);
|
|
MaybeProduceObjCObject(S, *this, Entity);
|
|
return;
|
|
}
|
|
|
|
assert(S.getLangOpts().CPlusPlus);
|
|
|
|
// - If the destination type is a (possibly cv-qualified) class type:
|
|
if (DestType->isRecordType()) {
|
|
// - If the initialization is direct-initialization, or if it is
|
|
// copy-initialization where the cv-unqualified version of the
|
|
// source type is the same class as, or a derived class of, the
|
|
// class of the destination, constructors are considered. [...]
|
|
if (Kind.getKind() == InitializationKind::IK_Direct ||
|
|
(Kind.getKind() == InitializationKind::IK_Copy &&
|
|
(Context.hasSameUnqualifiedType(SourceType, DestType) ||
|
|
S.IsDerivedFrom(SourceType, DestType))))
|
|
TryConstructorInitialization(S, Entity, Kind, Args,
|
|
DestType, *this);
|
|
// - Otherwise (i.e., for the remaining copy-initialization cases),
|
|
// user-defined conversion sequences that can convert from the source
|
|
// type to the destination type or (when a conversion function is
|
|
// used) to a derived class thereof are enumerated as described in
|
|
// 13.3.1.4, and the best one is chosen through overload resolution
|
|
// (13.3).
|
|
else
|
|
TryUserDefinedConversion(S, DestType, Kind, Initializer, *this,
|
|
TopLevelOfInitList);
|
|
return;
|
|
}
|
|
|
|
if (Args.size() > 1) {
|
|
SetFailed(FK_TooManyInitsForScalar);
|
|
return;
|
|
}
|
|
assert(Args.size() == 1 && "Zero-argument case handled above");
|
|
|
|
// - Otherwise, if the source type is a (possibly cv-qualified) class
|
|
// type, conversion functions are considered.
|
|
if (!SourceType.isNull() && SourceType->isRecordType()) {
|
|
// For a conversion to _Atomic(T) from either T or a class type derived
|
|
// from T, initialize the T object then convert to _Atomic type.
|
|
bool NeedAtomicConversion = false;
|
|
if (const AtomicType *Atomic = DestType->getAs<AtomicType>()) {
|
|
if (Context.hasSameUnqualifiedType(SourceType, Atomic->getValueType()) ||
|
|
S.IsDerivedFrom(SourceType, Atomic->getValueType())) {
|
|
DestType = Atomic->getValueType();
|
|
NeedAtomicConversion = true;
|
|
}
|
|
}
|
|
|
|
TryUserDefinedConversion(S, DestType, Kind, Initializer, *this,
|
|
TopLevelOfInitList);
|
|
MaybeProduceObjCObject(S, *this, Entity);
|
|
if (!Failed() && NeedAtomicConversion)
|
|
AddAtomicConversionStep(Entity.getType());
|
|
return;
|
|
}
|
|
|
|
// - Otherwise, the initial value of the object being initialized is the
|
|
// (possibly converted) value of the initializer expression. Standard
|
|
// conversions (Clause 4) will be used, if necessary, to convert the
|
|
// initializer expression to the cv-unqualified version of the
|
|
// destination type; no user-defined conversions are considered.
|
|
|
|
ImplicitConversionSequence ICS
|
|
= S.TryImplicitConversion(Initializer, DestType,
|
|
/*SuppressUserConversions*/true,
|
|
/*AllowExplicitConversions*/ false,
|
|
/*InOverloadResolution*/ false,
|
|
/*CStyle=*/Kind.isCStyleOrFunctionalCast(),
|
|
allowObjCWritebackConversion);
|
|
|
|
if (ICS.isStandard() &&
|
|
ICS.Standard.Second == ICK_Writeback_Conversion) {
|
|
// Objective-C ARC writeback conversion.
|
|
|
|
// We should copy unless we're passing to an argument explicitly
|
|
// marked 'out'.
|
|
bool ShouldCopy = true;
|
|
if (ParmVarDecl *Param = cast_or_null<ParmVarDecl>(Entity.getDecl()))
|
|
ShouldCopy = (Param->getObjCDeclQualifier() != ParmVarDecl::OBJC_TQ_Out);
|
|
|
|
// If there was an lvalue adjustment, add it as a separate conversion.
|
|
if (ICS.Standard.First == ICK_Array_To_Pointer ||
|
|
ICS.Standard.First == ICK_Lvalue_To_Rvalue) {
|
|
ImplicitConversionSequence LvalueICS;
|
|
LvalueICS.setStandard();
|
|
LvalueICS.Standard.setAsIdentityConversion();
|
|
LvalueICS.Standard.setAllToTypes(ICS.Standard.getToType(0));
|
|
LvalueICS.Standard.First = ICS.Standard.First;
|
|
AddConversionSequenceStep(LvalueICS, ICS.Standard.getToType(0));
|
|
}
|
|
|
|
AddPassByIndirectCopyRestoreStep(DestType, ShouldCopy);
|
|
} else if (ICS.isBad()) {
|
|
DeclAccessPair dap;
|
|
if (isLibstdcxxPointerReturnFalseHack(S, Entity, Initializer)) {
|
|
AddZeroInitializationStep(Entity.getType());
|
|
} else if (Initializer->getType() == Context.OverloadTy &&
|
|
!S.ResolveAddressOfOverloadedFunction(Initializer, DestType,
|
|
false, dap))
|
|
SetFailed(InitializationSequence::FK_AddressOfOverloadFailed);
|
|
else
|
|
SetFailed(InitializationSequence::FK_ConversionFailed);
|
|
} else {
|
|
AddConversionSequenceStep(ICS, DestType, TopLevelOfInitList);
|
|
|
|
MaybeProduceObjCObject(S, *this, Entity);
|
|
}
|
|
}
|
|
|
|
InitializationSequence::~InitializationSequence() {
|
|
for (SmallVectorImpl<Step>::iterator Step = Steps.begin(),
|
|
StepEnd = Steps.end();
|
|
Step != StepEnd; ++Step)
|
|
Step->Destroy();
|
|
}
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// Perform initialization
|
|
//===----------------------------------------------------------------------===//
|
|
static Sema::AssignmentAction
|
|
getAssignmentAction(const InitializedEntity &Entity, bool Diagnose = false) {
|
|
switch(Entity.getKind()) {
|
|
case InitializedEntity::EK_Variable:
|
|
case InitializedEntity::EK_New:
|
|
case InitializedEntity::EK_Exception:
|
|
case InitializedEntity::EK_Base:
|
|
case InitializedEntity::EK_Delegating:
|
|
return Sema::AA_Initializing;
|
|
|
|
case InitializedEntity::EK_Parameter:
|
|
if (Entity.getDecl() &&
|
|
isa<ObjCMethodDecl>(Entity.getDecl()->getDeclContext()))
|
|
return Sema::AA_Sending;
|
|
|
|
return Sema::AA_Passing;
|
|
|
|
case InitializedEntity::EK_Parameter_CF_Audited:
|
|
if (Entity.getDecl() &&
|
|
isa<ObjCMethodDecl>(Entity.getDecl()->getDeclContext()))
|
|
return Sema::AA_Sending;
|
|
|
|
return !Diagnose ? Sema::AA_Passing : Sema::AA_Passing_CFAudited;
|
|
|
|
case InitializedEntity::EK_Result:
|
|
return Sema::AA_Returning;
|
|
|
|
case InitializedEntity::EK_Temporary:
|
|
case InitializedEntity::EK_RelatedResult:
|
|
// FIXME: Can we tell apart casting vs. converting?
|
|
return Sema::AA_Casting;
|
|
|
|
case InitializedEntity::EK_Member:
|
|
case InitializedEntity::EK_ArrayElement:
|
|
case InitializedEntity::EK_VectorElement:
|
|
case InitializedEntity::EK_ComplexElement:
|
|
case InitializedEntity::EK_BlockElement:
|
|
case InitializedEntity::EK_LambdaCapture:
|
|
case InitializedEntity::EK_CompoundLiteralInit:
|
|
return Sema::AA_Initializing;
|
|
}
|
|
|
|
llvm_unreachable("Invalid EntityKind!");
|
|
}
|
|
|
|
/// \brief Whether we should bind a created object as a temporary when
|
|
/// initializing the given entity.
|
|
static bool shouldBindAsTemporary(const InitializedEntity &Entity) {
|
|
switch (Entity.getKind()) {
|
|
case InitializedEntity::EK_ArrayElement:
|
|
case InitializedEntity::EK_Member:
|
|
case InitializedEntity::EK_Result:
|
|
case InitializedEntity::EK_New:
|
|
case InitializedEntity::EK_Variable:
|
|
case InitializedEntity::EK_Base:
|
|
case InitializedEntity::EK_Delegating:
|
|
case InitializedEntity::EK_VectorElement:
|
|
case InitializedEntity::EK_ComplexElement:
|
|
case InitializedEntity::EK_Exception:
|
|
case InitializedEntity::EK_BlockElement:
|
|
case InitializedEntity::EK_LambdaCapture:
|
|
case InitializedEntity::EK_CompoundLiteralInit:
|
|
return false;
|
|
|
|
case InitializedEntity::EK_Parameter:
|
|
case InitializedEntity::EK_Parameter_CF_Audited:
|
|
case InitializedEntity::EK_Temporary:
|
|
case InitializedEntity::EK_RelatedResult:
|
|
return true;
|
|
}
|
|
|
|
llvm_unreachable("missed an InitializedEntity kind?");
|
|
}
|
|
|
|
/// \brief Whether the given entity, when initialized with an object
|
|
/// created for that initialization, requires destruction.
|
|
static bool shouldDestroyTemporary(const InitializedEntity &Entity) {
|
|
switch (Entity.getKind()) {
|
|
case InitializedEntity::EK_Result:
|
|
case InitializedEntity::EK_New:
|
|
case InitializedEntity::EK_Base:
|
|
case InitializedEntity::EK_Delegating:
|
|
case InitializedEntity::EK_VectorElement:
|
|
case InitializedEntity::EK_ComplexElement:
|
|
case InitializedEntity::EK_BlockElement:
|
|
case InitializedEntity::EK_LambdaCapture:
|
|
return false;
|
|
|
|
case InitializedEntity::EK_Member:
|
|
case InitializedEntity::EK_Variable:
|
|
case InitializedEntity::EK_Parameter:
|
|
case InitializedEntity::EK_Parameter_CF_Audited:
|
|
case InitializedEntity::EK_Temporary:
|
|
case InitializedEntity::EK_ArrayElement:
|
|
case InitializedEntity::EK_Exception:
|
|
case InitializedEntity::EK_CompoundLiteralInit:
|
|
case InitializedEntity::EK_RelatedResult:
|
|
return true;
|
|
}
|
|
|
|
llvm_unreachable("missed an InitializedEntity kind?");
|
|
}
|
|
|
|
/// \brief Look for copy and move constructors and constructor templates, for
|
|
/// copying an object via direct-initialization (per C++11 [dcl.init]p16).
|
|
static void LookupCopyAndMoveConstructors(Sema &S,
|
|
OverloadCandidateSet &CandidateSet,
|
|
CXXRecordDecl *Class,
|
|
Expr *CurInitExpr) {
|
|
DeclContext::lookup_result R = S.LookupConstructors(Class);
|
|
// The container holding the constructors can under certain conditions
|
|
// be changed while iterating (e.g. because of deserialization).
|
|
// To be safe we copy the lookup results to a new container.
|
|
SmallVector<NamedDecl*, 16> Ctors(R.begin(), R.end());
|
|
for (SmallVectorImpl<NamedDecl *>::iterator
|
|
CI = Ctors.begin(), CE = Ctors.end(); CI != CE; ++CI) {
|
|
NamedDecl *D = *CI;
|
|
CXXConstructorDecl *Constructor = nullptr;
|
|
|
|
if ((Constructor = dyn_cast<CXXConstructorDecl>(D))) {
|
|
// Handle copy/moveconstructors, only.
|
|
if (!Constructor || Constructor->isInvalidDecl() ||
|
|
!Constructor->isCopyOrMoveConstructor() ||
|
|
!Constructor->isConvertingConstructor(/*AllowExplicit=*/true))
|
|
continue;
|
|
|
|
DeclAccessPair FoundDecl
|
|
= DeclAccessPair::make(Constructor, Constructor->getAccess());
|
|
S.AddOverloadCandidate(Constructor, FoundDecl,
|
|
CurInitExpr, CandidateSet);
|
|
continue;
|
|
}
|
|
|
|
// Handle constructor templates.
|
|
FunctionTemplateDecl *ConstructorTmpl = cast<FunctionTemplateDecl>(D);
|
|
if (ConstructorTmpl->isInvalidDecl())
|
|
continue;
|
|
|
|
Constructor = cast<CXXConstructorDecl>(
|
|
ConstructorTmpl->getTemplatedDecl());
|
|
if (!Constructor->isConvertingConstructor(/*AllowExplicit=*/true))
|
|
continue;
|
|
|
|
// FIXME: Do we need to limit this to copy-constructor-like
|
|
// candidates?
|
|
DeclAccessPair FoundDecl
|
|
= DeclAccessPair::make(ConstructorTmpl, ConstructorTmpl->getAccess());
|
|
S.AddTemplateOverloadCandidate(ConstructorTmpl, FoundDecl, nullptr,
|
|
CurInitExpr, CandidateSet, true);
|
|
}
|
|
}
|
|
|
|
/// \brief Get the location at which initialization diagnostics should appear.
|
|
static SourceLocation getInitializationLoc(const InitializedEntity &Entity,
|
|
Expr *Initializer) {
|
|
switch (Entity.getKind()) {
|
|
case InitializedEntity::EK_Result:
|
|
return Entity.getReturnLoc();
|
|
|
|
case InitializedEntity::EK_Exception:
|
|
return Entity.getThrowLoc();
|
|
|
|
case InitializedEntity::EK_Variable:
|
|
return Entity.getDecl()->getLocation();
|
|
|
|
case InitializedEntity::EK_LambdaCapture:
|
|
return Entity.getCaptureLoc();
|
|
|
|
case InitializedEntity::EK_ArrayElement:
|
|
case InitializedEntity::EK_Member:
|
|
case InitializedEntity::EK_Parameter:
|
|
case InitializedEntity::EK_Parameter_CF_Audited:
|
|
case InitializedEntity::EK_Temporary:
|
|
case InitializedEntity::EK_New:
|
|
case InitializedEntity::EK_Base:
|
|
case InitializedEntity::EK_Delegating:
|
|
case InitializedEntity::EK_VectorElement:
|
|
case InitializedEntity::EK_ComplexElement:
|
|
case InitializedEntity::EK_BlockElement:
|
|
case InitializedEntity::EK_CompoundLiteralInit:
|
|
case InitializedEntity::EK_RelatedResult:
|
|
return Initializer->getLocStart();
|
|
}
|
|
llvm_unreachable("missed an InitializedEntity kind?");
|
|
}
|
|
|
|
/// \brief Make a (potentially elidable) temporary copy of the object
|
|
/// provided by the given initializer by calling the appropriate copy
|
|
/// constructor.
|
|
///
|
|
/// \param S The Sema object used for type-checking.
|
|
///
|
|
/// \param T The type of the temporary object, which must either be
|
|
/// the type of the initializer expression or a superclass thereof.
|
|
///
|
|
/// \param Entity The entity being initialized.
|
|
///
|
|
/// \param CurInit The initializer expression.
|
|
///
|
|
/// \param IsExtraneousCopy Whether this is an "extraneous" copy that
|
|
/// is permitted in C++03 (but not C++0x) when binding a reference to
|
|
/// an rvalue.
|
|
///
|
|
/// \returns An expression that copies the initializer expression into
|
|
/// a temporary object, or an error expression if a copy could not be
|
|
/// created.
|
|
static ExprResult CopyObject(Sema &S,
|
|
QualType T,
|
|
const InitializedEntity &Entity,
|
|
ExprResult CurInit,
|
|
bool IsExtraneousCopy) {
|
|
if (CurInit.isInvalid())
|
|
return CurInit;
|
|
// Determine which class type we're copying to.
|
|
Expr *CurInitExpr = (Expr *)CurInit.get();
|
|
CXXRecordDecl *Class = nullptr;
|
|
if (const RecordType *Record = T->getAs<RecordType>())
|
|
Class = cast<CXXRecordDecl>(Record->getDecl());
|
|
if (!Class)
|
|
return CurInit;
|
|
|
|
// C++0x [class.copy]p32:
|
|
// When certain criteria are met, an implementation is allowed to
|
|
// omit the copy/move construction of a class object, even if the
|
|
// copy/move constructor and/or destructor for the object have
|
|
// side effects. [...]
|
|
// - when a temporary class object that has not been bound to a
|
|
// reference (12.2) would be copied/moved to a class object
|
|
// with the same cv-unqualified type, the copy/move operation
|
|
// can be omitted by constructing the temporary object
|
|
// directly into the target of the omitted copy/move
|
|
//
|
|
// Note that the other three bullets are handled elsewhere. Copy
|
|
// elision for return statements and throw expressions are handled as part
|
|
// of constructor initialization, while copy elision for exception handlers
|
|
// is handled by the run-time.
|
|
bool Elidable = CurInitExpr->isTemporaryObject(S.Context, Class);
|
|
SourceLocation Loc = getInitializationLoc(Entity, CurInit.get());
|
|
|
|
// Make sure that the type we are copying is complete.
|
|
if (S.RequireCompleteType(Loc, T, diag::err_temp_copy_incomplete))
|
|
return CurInit;
|
|
|
|
// Perform overload resolution using the class's copy/move constructors.
|
|
// Only consider constructors and constructor templates. Per
|
|
// C++0x [dcl.init]p16, second bullet to class types, this initialization
|
|
// is direct-initialization.
|
|
OverloadCandidateSet CandidateSet(Loc, OverloadCandidateSet::CSK_Normal);
|
|
LookupCopyAndMoveConstructors(S, CandidateSet, Class, CurInitExpr);
|
|
|
|
bool HadMultipleCandidates = (CandidateSet.size() > 1);
|
|
|
|
OverloadCandidateSet::iterator Best;
|
|
switch (CandidateSet.BestViableFunction(S, Loc, Best)) {
|
|
case OR_Success:
|
|
break;
|
|
|
|
case OR_No_Viable_Function:
|
|
S.Diag(Loc, IsExtraneousCopy && !S.isSFINAEContext()
|
|
? diag::ext_rvalue_to_reference_temp_copy_no_viable
|
|
: diag::err_temp_copy_no_viable)
|
|
<< (int)Entity.getKind() << CurInitExpr->getType()
|
|
<< CurInitExpr->getSourceRange();
|
|
CandidateSet.NoteCandidates(S, OCD_AllCandidates, CurInitExpr);
|
|
if (!IsExtraneousCopy || S.isSFINAEContext())
|
|
return ExprError();
|
|
return CurInit;
|
|
|
|
case OR_Ambiguous:
|
|
S.Diag(Loc, diag::err_temp_copy_ambiguous)
|
|
<< (int)Entity.getKind() << CurInitExpr->getType()
|
|
<< CurInitExpr->getSourceRange();
|
|
CandidateSet.NoteCandidates(S, OCD_ViableCandidates, CurInitExpr);
|
|
return ExprError();
|
|
|
|
case OR_Deleted:
|
|
S.Diag(Loc, diag::err_temp_copy_deleted)
|
|
<< (int)Entity.getKind() << CurInitExpr->getType()
|
|
<< CurInitExpr->getSourceRange();
|
|
S.NoteDeletedFunction(Best->Function);
|
|
return ExprError();
|
|
}
|
|
|
|
CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(Best->Function);
|
|
SmallVector<Expr*, 8> ConstructorArgs;
|
|
CurInit.get(); // Ownership transferred into MultiExprArg, below.
|
|
|
|
S.CheckConstructorAccess(Loc, Constructor, Entity,
|
|
Best->FoundDecl.getAccess(), IsExtraneousCopy);
|
|
|
|
if (IsExtraneousCopy) {
|
|
// If this is a totally extraneous copy for C++03 reference
|
|
// binding purposes, just return the original initialization
|
|
// expression. We don't generate an (elided) copy operation here
|
|
// because doing so would require us to pass down a flag to avoid
|
|
// infinite recursion, where each step adds another extraneous,
|
|
// elidable copy.
|
|
|
|
// Instantiate the default arguments of any extra parameters in
|
|
// the selected copy constructor, as if we were going to create a
|
|
// proper call to the copy constructor.
|
|
for (unsigned I = 1, N = Constructor->getNumParams(); I != N; ++I) {
|
|
ParmVarDecl *Parm = Constructor->getParamDecl(I);
|
|
if (S.RequireCompleteType(Loc, Parm->getType(),
|
|
diag::err_call_incomplete_argument))
|
|
break;
|
|
|
|
// Build the default argument expression; we don't actually care
|
|
// if this succeeds or not, because this routine will complain
|
|
// if there was a problem.
|
|
S.BuildCXXDefaultArgExpr(Loc, Constructor, Parm);
|
|
}
|
|
|
|
return CurInitExpr;
|
|
}
|
|
|
|
// Determine the arguments required to actually perform the
|
|
// constructor call (we might have derived-to-base conversions, or
|
|
// the copy constructor may have default arguments).
|
|
if (S.CompleteConstructorCall(Constructor, CurInitExpr, Loc, ConstructorArgs))
|
|
return ExprError();
|
|
|
|
// Actually perform the constructor call.
|
|
CurInit = S.BuildCXXConstructExpr(Loc, T, Constructor, Elidable,
|
|
ConstructorArgs,
|
|
HadMultipleCandidates,
|
|
/*ListInit*/ false,
|
|
/*StdInitListInit*/ false,
|
|
/*ZeroInit*/ false,
|
|
CXXConstructExpr::CK_Complete,
|
|
SourceRange());
|
|
|
|
// If we're supposed to bind temporaries, do so.
|
|
if (!CurInit.isInvalid() && shouldBindAsTemporary(Entity))
|
|
CurInit = S.MaybeBindToTemporary(CurInit.getAs<Expr>());
|
|
return CurInit;
|
|
}
|
|
|
|
/// \brief Check whether elidable copy construction for binding a reference to
|
|
/// a temporary would have succeeded if we were building in C++98 mode, for
|
|
/// -Wc++98-compat.
|
|
static void CheckCXX98CompatAccessibleCopy(Sema &S,
|
|
const InitializedEntity &Entity,
|
|
Expr *CurInitExpr) {
|
|
assert(S.getLangOpts().CPlusPlus11);
|
|
|
|
const RecordType *Record = CurInitExpr->getType()->getAs<RecordType>();
|
|
if (!Record)
|
|
return;
|
|
|
|
SourceLocation Loc = getInitializationLoc(Entity, CurInitExpr);
|
|
if (S.Diags.isIgnored(diag::warn_cxx98_compat_temp_copy, Loc))
|
|
return;
|
|
|
|
// Find constructors which would have been considered.
|
|
OverloadCandidateSet CandidateSet(Loc, OverloadCandidateSet::CSK_Normal);
|
|
LookupCopyAndMoveConstructors(
|
|
S, CandidateSet, cast<CXXRecordDecl>(Record->getDecl()), CurInitExpr);
|
|
|
|
// Perform overload resolution.
|
|
OverloadCandidateSet::iterator Best;
|
|
OverloadingResult OR = CandidateSet.BestViableFunction(S, Loc, Best);
|
|
|
|
PartialDiagnostic Diag = S.PDiag(diag::warn_cxx98_compat_temp_copy)
|
|
<< OR << (int)Entity.getKind() << CurInitExpr->getType()
|
|
<< CurInitExpr->getSourceRange();
|
|
|
|
switch (OR) {
|
|
case OR_Success:
|
|
S.CheckConstructorAccess(Loc, cast<CXXConstructorDecl>(Best->Function),
|
|
Entity, Best->FoundDecl.getAccess(), Diag);
|
|
// FIXME: Check default arguments as far as that's possible.
|
|
break;
|
|
|
|
case OR_No_Viable_Function:
|
|
S.Diag(Loc, Diag);
|
|
CandidateSet.NoteCandidates(S, OCD_AllCandidates, CurInitExpr);
|
|
break;
|
|
|
|
case OR_Ambiguous:
|
|
S.Diag(Loc, Diag);
|
|
CandidateSet.NoteCandidates(S, OCD_ViableCandidates, CurInitExpr);
|
|
break;
|
|
|
|
case OR_Deleted:
|
|
S.Diag(Loc, Diag);
|
|
S.NoteDeletedFunction(Best->Function);
|
|
break;
|
|
}
|
|
}
|
|
|
|
void InitializationSequence::PrintInitLocationNote(Sema &S,
|
|
const InitializedEntity &Entity) {
|
|
if (Entity.isParameterKind() && Entity.getDecl()) {
|
|
if (Entity.getDecl()->getLocation().isInvalid())
|
|
return;
|
|
|
|
if (Entity.getDecl()->getDeclName())
|
|
S.Diag(Entity.getDecl()->getLocation(), diag::note_parameter_named_here)
|
|
<< Entity.getDecl()->getDeclName();
|
|
else
|
|
S.Diag(Entity.getDecl()->getLocation(), diag::note_parameter_here);
|
|
}
|
|
else if (Entity.getKind() == InitializedEntity::EK_RelatedResult &&
|
|
Entity.getMethodDecl())
|
|
S.Diag(Entity.getMethodDecl()->getLocation(),
|
|
diag::note_method_return_type_change)
|
|
<< Entity.getMethodDecl()->getDeclName();
|
|
}
|
|
|
|
static bool isReferenceBinding(const InitializationSequence::Step &s) {
|
|
return s.Kind == InitializationSequence::SK_BindReference ||
|
|
s.Kind == InitializationSequence::SK_BindReferenceToTemporary;
|
|
}
|
|
|
|
/// Returns true if the parameters describe a constructor initialization of
|
|
/// an explicit temporary object, e.g. "Point(x, y)".
|
|
static bool isExplicitTemporary(const InitializedEntity &Entity,
|
|
const InitializationKind &Kind,
|
|
unsigned NumArgs) {
|
|
switch (Entity.getKind()) {
|
|
case InitializedEntity::EK_Temporary:
|
|
case InitializedEntity::EK_CompoundLiteralInit:
|
|
case InitializedEntity::EK_RelatedResult:
|
|
break;
|
|
default:
|
|
return false;
|
|
}
|
|
|
|
switch (Kind.getKind()) {
|
|
case InitializationKind::IK_DirectList:
|
|
return true;
|
|
// FIXME: Hack to work around cast weirdness.
|
|
case InitializationKind::IK_Direct:
|
|
case InitializationKind::IK_Value:
|
|
return NumArgs != 1;
|
|
default:
|
|
return false;
|
|
}
|
|
}
|
|
|
|
static ExprResult
|
|
PerformConstructorInitialization(Sema &S,
|
|
const InitializedEntity &Entity,
|
|
const InitializationKind &Kind,
|
|
MultiExprArg Args,
|
|
const InitializationSequence::Step& Step,
|
|
bool &ConstructorInitRequiresZeroInit,
|
|
bool IsListInitialization,
|
|
bool IsStdInitListInitialization,
|
|
SourceLocation LBraceLoc,
|
|
SourceLocation RBraceLoc) {
|
|
unsigned NumArgs = Args.size();
|
|
CXXConstructorDecl *Constructor
|
|
= cast<CXXConstructorDecl>(Step.Function.Function);
|
|
bool HadMultipleCandidates = Step.Function.HadMultipleCandidates;
|
|
|
|
// Build a call to the selected constructor.
|
|
SmallVector<Expr*, 8> ConstructorArgs;
|
|
SourceLocation Loc = (Kind.isCopyInit() && Kind.getEqualLoc().isValid())
|
|
? Kind.getEqualLoc()
|
|
: Kind.getLocation();
|
|
|
|
if (Kind.getKind() == InitializationKind::IK_Default) {
|
|
// Force even a trivial, implicit default constructor to be
|
|
// semantically checked. We do this explicitly because we don't build
|
|
// the definition for completely trivial constructors.
|
|
assert(Constructor->getParent() && "No parent class for constructor.");
|
|
if (Constructor->isDefaulted() && Constructor->isDefaultConstructor() &&
|
|
Constructor->isTrivial() && !Constructor->isUsed(false))
|
|
S.DefineImplicitDefaultConstructor(Loc, Constructor);
|
|
}
|
|
|
|
ExprResult CurInit((Expr *)nullptr);
|
|
|
|
// C++ [over.match.copy]p1:
|
|
// - When initializing a temporary to be bound to the first parameter
|
|
// of a constructor that takes a reference to possibly cv-qualified
|
|
// T as its first argument, called with a single argument in the
|
|
// context of direct-initialization, explicit conversion functions
|
|
// are also considered.
|
|
bool AllowExplicitConv = Kind.AllowExplicit() && !Kind.isCopyInit() &&
|
|
Args.size() == 1 &&
|
|
Constructor->isCopyOrMoveConstructor();
|
|
|
|
// Determine the arguments required to actually perform the constructor
|
|
// call.
|
|
if (S.CompleteConstructorCall(Constructor, Args,
|
|
Loc, ConstructorArgs,
|
|
AllowExplicitConv,
|
|
IsListInitialization))
|
|
return ExprError();
|
|
|
|
|
|
if (isExplicitTemporary(Entity, Kind, NumArgs)) {
|
|
// An explicitly-constructed temporary, e.g., X(1, 2).
|
|
S.MarkFunctionReferenced(Loc, Constructor);
|
|
if (S.DiagnoseUseOfDecl(Constructor, Loc))
|
|
return ExprError();
|
|
|
|
TypeSourceInfo *TSInfo = Entity.getTypeSourceInfo();
|
|
if (!TSInfo)
|
|
TSInfo = S.Context.getTrivialTypeSourceInfo(Entity.getType(), Loc);
|
|
SourceRange ParenOrBraceRange =
|
|
(Kind.getKind() == InitializationKind::IK_DirectList)
|
|
? SourceRange(LBraceLoc, RBraceLoc)
|
|
: Kind.getParenRange();
|
|
|
|
CurInit = new (S.Context) CXXTemporaryObjectExpr(
|
|
S.Context, Constructor, TSInfo, ConstructorArgs, ParenOrBraceRange,
|
|
HadMultipleCandidates, IsListInitialization,
|
|
IsStdInitListInitialization, ConstructorInitRequiresZeroInit);
|
|
} else {
|
|
CXXConstructExpr::ConstructionKind ConstructKind =
|
|
CXXConstructExpr::CK_Complete;
|
|
|
|
if (Entity.getKind() == InitializedEntity::EK_Base) {
|
|
ConstructKind = Entity.getBaseSpecifier()->isVirtual() ?
|
|
CXXConstructExpr::CK_VirtualBase :
|
|
CXXConstructExpr::CK_NonVirtualBase;
|
|
} else if (Entity.getKind() == InitializedEntity::EK_Delegating) {
|
|
ConstructKind = CXXConstructExpr::CK_Delegating;
|
|
}
|
|
|
|
// Only get the parenthesis or brace range if it is a list initialization or
|
|
// direct construction.
|
|
SourceRange ParenOrBraceRange;
|
|
if (IsListInitialization)
|
|
ParenOrBraceRange = SourceRange(LBraceLoc, RBraceLoc);
|
|
else if (Kind.getKind() == InitializationKind::IK_Direct)
|
|
ParenOrBraceRange = Kind.getParenRange();
|
|
|
|
// If the entity allows NRVO, mark the construction as elidable
|
|
// unconditionally.
|
|
if (Entity.allowsNRVO())
|
|
CurInit = S.BuildCXXConstructExpr(Loc, Entity.getType(),
|
|
Constructor, /*Elidable=*/true,
|
|
ConstructorArgs,
|
|
HadMultipleCandidates,
|
|
IsListInitialization,
|
|
IsStdInitListInitialization,
|
|
ConstructorInitRequiresZeroInit,
|
|
ConstructKind,
|
|
ParenOrBraceRange);
|
|
else
|
|
CurInit = S.BuildCXXConstructExpr(Loc, Entity.getType(),
|
|
Constructor,
|
|
ConstructorArgs,
|
|
HadMultipleCandidates,
|
|
IsListInitialization,
|
|
IsStdInitListInitialization,
|
|
ConstructorInitRequiresZeroInit,
|
|
ConstructKind,
|
|
ParenOrBraceRange);
|
|
}
|
|
if (CurInit.isInvalid())
|
|
return ExprError();
|
|
|
|
// Only check access if all of that succeeded.
|
|
S.CheckConstructorAccess(Loc, Constructor, Entity,
|
|
Step.Function.FoundDecl.getAccess());
|
|
if (S.DiagnoseUseOfDecl(Step.Function.FoundDecl, Loc))
|
|
return ExprError();
|
|
|
|
if (shouldBindAsTemporary(Entity))
|
|
CurInit = S.MaybeBindToTemporary(CurInit.get());
|
|
|
|
return CurInit;
|
|
}
|
|
|
|
/// Determine whether the specified InitializedEntity definitely has a lifetime
|
|
/// longer than the current full-expression. Conservatively returns false if
|
|
/// it's unclear.
|
|
static bool
|
|
InitializedEntityOutlivesFullExpression(const InitializedEntity &Entity) {
|
|
const InitializedEntity *Top = &Entity;
|
|
while (Top->getParent())
|
|
Top = Top->getParent();
|
|
|
|
switch (Top->getKind()) {
|
|
case InitializedEntity::EK_Variable:
|
|
case InitializedEntity::EK_Result:
|
|
case InitializedEntity::EK_Exception:
|
|
case InitializedEntity::EK_Member:
|
|
case InitializedEntity::EK_New:
|
|
case InitializedEntity::EK_Base:
|
|
case InitializedEntity::EK_Delegating:
|
|
return true;
|
|
|
|
case InitializedEntity::EK_ArrayElement:
|
|
case InitializedEntity::EK_VectorElement:
|
|
case InitializedEntity::EK_BlockElement:
|
|
case InitializedEntity::EK_ComplexElement:
|
|
// Could not determine what the full initialization is. Assume it might not
|
|
// outlive the full-expression.
|
|
return false;
|
|
|
|
case InitializedEntity::EK_Parameter:
|
|
case InitializedEntity::EK_Parameter_CF_Audited:
|
|
case InitializedEntity::EK_Temporary:
|
|
case InitializedEntity::EK_LambdaCapture:
|
|
case InitializedEntity::EK_CompoundLiteralInit:
|
|
case InitializedEntity::EK_RelatedResult:
|
|
// The entity being initialized might not outlive the full-expression.
|
|
return false;
|
|
}
|
|
|
|
llvm_unreachable("unknown entity kind");
|
|
}
|
|
|
|
/// Determine the declaration which an initialized entity ultimately refers to,
|
|
/// for the purpose of lifetime-extending a temporary bound to a reference in
|
|
/// the initialization of \p Entity.
|
|
static const InitializedEntity *getEntityForTemporaryLifetimeExtension(
|
|
const InitializedEntity *Entity,
|
|
const InitializedEntity *FallbackDecl = nullptr) {
|
|
// C++11 [class.temporary]p5:
|
|
switch (Entity->getKind()) {
|
|
case InitializedEntity::EK_Variable:
|
|
// The temporary [...] persists for the lifetime of the reference
|
|
return Entity;
|
|
|
|
case InitializedEntity::EK_Member:
|
|
// For subobjects, we look at the complete object.
|
|
if (Entity->getParent())
|
|
return getEntityForTemporaryLifetimeExtension(Entity->getParent(),
|
|
Entity);
|
|
|
|
// except:
|
|
// -- A temporary bound to a reference member in a constructor's
|
|
// ctor-initializer persists until the constructor exits.
|
|
return Entity;
|
|
|
|
case InitializedEntity::EK_Parameter:
|
|
case InitializedEntity::EK_Parameter_CF_Audited:
|
|
// -- A temporary bound to a reference parameter in a function call
|
|
// persists until the completion of the full-expression containing
|
|
// the call.
|
|
case InitializedEntity::EK_Result:
|
|
// -- The lifetime of a temporary bound to the returned value in a
|
|
// function return statement is not extended; the temporary is
|
|
// destroyed at the end of the full-expression in the return statement.
|
|
case InitializedEntity::EK_New:
|
|
// -- A temporary bound to a reference in a new-initializer persists
|
|
// until the completion of the full-expression containing the
|
|
// new-initializer.
|
|
return nullptr;
|
|
|
|
case InitializedEntity::EK_Temporary:
|
|
case InitializedEntity::EK_CompoundLiteralInit:
|
|
case InitializedEntity::EK_RelatedResult:
|
|
// We don't yet know the storage duration of the surrounding temporary.
|
|
// Assume it's got full-expression duration for now, it will patch up our
|
|
// storage duration if that's not correct.
|
|
return nullptr;
|
|
|
|
case InitializedEntity::EK_ArrayElement:
|
|
// For subobjects, we look at the complete object.
|
|
return getEntityForTemporaryLifetimeExtension(Entity->getParent(),
|
|
FallbackDecl);
|
|
|
|
case InitializedEntity::EK_Base:
|
|
case InitializedEntity::EK_Delegating:
|
|
// We can reach this case for aggregate initialization in a constructor:
|
|
// struct A { int &&r; };
|
|
// struct B : A { B() : A{0} {} };
|
|
// In this case, use the innermost field decl as the context.
|
|
return FallbackDecl;
|
|
|
|
case InitializedEntity::EK_BlockElement:
|
|
case InitializedEntity::EK_LambdaCapture:
|
|
case InitializedEntity::EK_Exception:
|
|
case InitializedEntity::EK_VectorElement:
|
|
case InitializedEntity::EK_ComplexElement:
|
|
return nullptr;
|
|
}
|
|
llvm_unreachable("unknown entity kind");
|
|
}
|
|
|
|
static void performLifetimeExtension(Expr *Init,
|
|
const InitializedEntity *ExtendingEntity);
|
|
|
|
/// Update a glvalue expression that is used as the initializer of a reference
|
|
/// to note that its lifetime is extended.
|
|
/// \return \c true if any temporary had its lifetime extended.
|
|
static bool
|
|
performReferenceExtension(Expr *Init,
|
|
const InitializedEntity *ExtendingEntity) {
|
|
// Walk past any constructs which we can lifetime-extend across.
|
|
Expr *Old;
|
|
do {
|
|
Old = Init;
|
|
|
|
if (InitListExpr *ILE = dyn_cast<InitListExpr>(Init)) {
|
|
if (ILE->getNumInits() == 1 && ILE->isGLValue()) {
|
|
// This is just redundant braces around an initializer. Step over it.
|
|
Init = ILE->getInit(0);
|
|
}
|
|
}
|
|
|
|
// Step over any subobject adjustments; we may have a materialized
|
|
// temporary inside them.
|
|
SmallVector<const Expr *, 2> CommaLHSs;
|
|
SmallVector<SubobjectAdjustment, 2> Adjustments;
|
|
Init = const_cast<Expr *>(
|
|
Init->skipRValueSubobjectAdjustments(CommaLHSs, Adjustments));
|
|
|
|
// Per current approach for DR1376, look through casts to reference type
|
|
// when performing lifetime extension.
|
|
if (CastExpr *CE = dyn_cast<CastExpr>(Init))
|
|
if (CE->getSubExpr()->isGLValue())
|
|
Init = CE->getSubExpr();
|
|
|
|
// FIXME: Per DR1213, subscripting on an array temporary produces an xvalue.
|
|
// It's unclear if binding a reference to that xvalue extends the array
|
|
// temporary.
|
|
} while (Init != Old);
|
|
|
|
if (MaterializeTemporaryExpr *ME = dyn_cast<MaterializeTemporaryExpr>(Init)) {
|
|
// Update the storage duration of the materialized temporary.
|
|
// FIXME: Rebuild the expression instead of mutating it.
|
|
ME->setExtendingDecl(ExtendingEntity->getDecl(),
|
|
ExtendingEntity->allocateManglingNumber());
|
|
performLifetimeExtension(ME->GetTemporaryExpr(), ExtendingEntity);
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/// Update a prvalue expression that is going to be materialized as a
|
|
/// lifetime-extended temporary.
|
|
static void performLifetimeExtension(Expr *Init,
|
|
const InitializedEntity *ExtendingEntity) {
|
|
// Dig out the expression which constructs the extended temporary.
|
|
SmallVector<const Expr *, 2> CommaLHSs;
|
|
SmallVector<SubobjectAdjustment, 2> Adjustments;
|
|
Init = const_cast<Expr *>(
|
|
Init->skipRValueSubobjectAdjustments(CommaLHSs, Adjustments));
|
|
|
|
if (CXXBindTemporaryExpr *BTE = dyn_cast<CXXBindTemporaryExpr>(Init))
|
|
Init = BTE->getSubExpr();
|
|
|
|
if (CXXStdInitializerListExpr *ILE =
|
|
dyn_cast<CXXStdInitializerListExpr>(Init)) {
|
|
performReferenceExtension(ILE->getSubExpr(), ExtendingEntity);
|
|
return;
|
|
}
|
|
|
|
if (InitListExpr *ILE = dyn_cast<InitListExpr>(Init)) {
|
|
if (ILE->getType()->isArrayType()) {
|
|
for (unsigned I = 0, N = ILE->getNumInits(); I != N; ++I)
|
|
performLifetimeExtension(ILE->getInit(I), ExtendingEntity);
|
|
return;
|
|
}
|
|
|
|
if (CXXRecordDecl *RD = ILE->getType()->getAsCXXRecordDecl()) {
|
|
assert(RD->isAggregate() && "aggregate init on non-aggregate");
|
|
|
|
// If we lifetime-extend a braced initializer which is initializing an
|
|
// aggregate, and that aggregate contains reference members which are
|
|
// bound to temporaries, those temporaries are also lifetime-extended.
|
|
if (RD->isUnion() && ILE->getInitializedFieldInUnion() &&
|
|
ILE->getInitializedFieldInUnion()->getType()->isReferenceType())
|
|
performReferenceExtension(ILE->getInit(0), ExtendingEntity);
|
|
else {
|
|
unsigned Index = 0;
|
|
for (const auto *I : RD->fields()) {
|
|
if (Index >= ILE->getNumInits())
|
|
break;
|
|
if (I->isUnnamedBitfield())
|
|
continue;
|
|
Expr *SubInit = ILE->getInit(Index);
|
|
if (I->getType()->isReferenceType())
|
|
performReferenceExtension(SubInit, ExtendingEntity);
|
|
else if (isa<InitListExpr>(SubInit) ||
|
|
isa<CXXStdInitializerListExpr>(SubInit))
|
|
// This may be either aggregate-initialization of a member or
|
|
// initialization of a std::initializer_list object. Either way,
|
|
// we should recursively lifetime-extend that initializer.
|
|
performLifetimeExtension(SubInit, ExtendingEntity);
|
|
++Index;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
static void warnOnLifetimeExtension(Sema &S, const InitializedEntity &Entity,
|
|
const Expr *Init, bool IsInitializerList,
|
|
const ValueDecl *ExtendingDecl) {
|
|
// Warn if a field lifetime-extends a temporary.
|
|
if (isa<FieldDecl>(ExtendingDecl)) {
|
|
if (IsInitializerList) {
|
|
S.Diag(Init->getExprLoc(), diag::warn_dangling_std_initializer_list)
|
|
<< /*at end of constructor*/true;
|
|
return;
|
|
}
|
|
|
|
bool IsSubobjectMember = false;
|
|
for (const InitializedEntity *Ent = Entity.getParent(); Ent;
|
|
Ent = Ent->getParent()) {
|
|
if (Ent->getKind() != InitializedEntity::EK_Base) {
|
|
IsSubobjectMember = true;
|
|
break;
|
|
}
|
|
}
|
|
S.Diag(Init->getExprLoc(),
|
|
diag::warn_bind_ref_member_to_temporary)
|
|
<< ExtendingDecl << Init->getSourceRange()
|
|
<< IsSubobjectMember << IsInitializerList;
|
|
if (IsSubobjectMember)
|
|
S.Diag(ExtendingDecl->getLocation(),
|
|
diag::note_ref_subobject_of_member_declared_here);
|
|
else
|
|
S.Diag(ExtendingDecl->getLocation(),
|
|
diag::note_ref_or_ptr_member_declared_here)
|
|
<< /*is pointer*/false;
|
|
}
|
|
}
|
|
|
|
static void DiagnoseNarrowingInInitList(Sema &S,
|
|
const ImplicitConversionSequence &ICS,
|
|
QualType PreNarrowingType,
|
|
QualType EntityType,
|
|
const Expr *PostInit);
|
|
|
|
ExprResult
|
|
InitializationSequence::Perform(Sema &S,
|
|
const InitializedEntity &Entity,
|
|
const InitializationKind &Kind,
|
|
MultiExprArg Args,
|
|
QualType *ResultType) {
|
|
if (Failed()) {
|
|
Diagnose(S, Entity, Kind, Args);
|
|
return ExprError();
|
|
}
|
|
|
|
if (getKind() == DependentSequence) {
|
|
// If the declaration is a non-dependent, incomplete array type
|
|
// that has an initializer, then its type will be completed once
|
|
// the initializer is instantiated.
|
|
if (ResultType && !Entity.getType()->isDependentType() &&
|
|
Args.size() == 1) {
|
|
QualType DeclType = Entity.getType();
|
|
if (const IncompleteArrayType *ArrayT
|
|
= S.Context.getAsIncompleteArrayType(DeclType)) {
|
|
// FIXME: We don't currently have the ability to accurately
|
|
// compute the length of an initializer list without
|
|
// performing full type-checking of the initializer list
|
|
// (since we have to determine where braces are implicitly
|
|
// introduced and such). So, we fall back to making the array
|
|
// type a dependently-sized array type with no specified
|
|
// bound.
|
|
if (isa<InitListExpr>((Expr *)Args[0])) {
|
|
SourceRange Brackets;
|
|
|
|
// Scavange the location of the brackets from the entity, if we can.
|
|
if (DeclaratorDecl *DD = Entity.getDecl()) {
|
|
if (TypeSourceInfo *TInfo = DD->getTypeSourceInfo()) {
|
|
TypeLoc TL = TInfo->getTypeLoc();
|
|
if (IncompleteArrayTypeLoc ArrayLoc =
|
|
TL.getAs<IncompleteArrayTypeLoc>())
|
|
Brackets = ArrayLoc.getBracketsRange();
|
|
}
|
|
}
|
|
|
|
*ResultType
|
|
= S.Context.getDependentSizedArrayType(ArrayT->getElementType(),
|
|
/*NumElts=*/nullptr,
|
|
ArrayT->getSizeModifier(),
|
|
ArrayT->getIndexTypeCVRQualifiers(),
|
|
Brackets);
|
|
}
|
|
|
|
}
|
|
}
|
|
if (Kind.getKind() == InitializationKind::IK_Direct &&
|
|
!Kind.isExplicitCast()) {
|
|
// Rebuild the ParenListExpr.
|
|
SourceRange ParenRange = Kind.getParenRange();
|
|
return S.ActOnParenListExpr(ParenRange.getBegin(), ParenRange.getEnd(),
|
|
Args);
|
|
}
|
|
assert(Kind.getKind() == InitializationKind::IK_Copy ||
|
|
Kind.isExplicitCast() ||
|
|
Kind.getKind() == InitializationKind::IK_DirectList);
|
|
return ExprResult(Args[0]);
|
|
}
|
|
|
|
// No steps means no initialization.
|
|
if (Steps.empty())
|
|
return ExprResult((Expr *)nullptr);
|
|
|
|
if (S.getLangOpts().CPlusPlus11 && Entity.getType()->isReferenceType() &&
|
|
Args.size() == 1 && isa<InitListExpr>(Args[0]) &&
|
|
!Entity.isParameterKind()) {
|
|
// Produce a C++98 compatibility warning if we are initializing a reference
|
|
// from an initializer list. For parameters, we produce a better warning
|
|
// elsewhere.
|
|
Expr *Init = Args[0];
|
|
S.Diag(Init->getLocStart(), diag::warn_cxx98_compat_reference_list_init)
|
|
<< Init->getSourceRange();
|
|
}
|
|
|
|
// Diagnose cases where we initialize a pointer to an array temporary, and the
|
|
// pointer obviously outlives the temporary.
|
|
if (Args.size() == 1 && Args[0]->getType()->isArrayType() &&
|
|
Entity.getType()->isPointerType() &&
|
|
InitializedEntityOutlivesFullExpression(Entity)) {
|
|
Expr *Init = Args[0];
|
|
Expr::LValueClassification Kind = Init->ClassifyLValue(S.Context);
|
|
if (Kind == Expr::LV_ClassTemporary || Kind == Expr::LV_ArrayTemporary)
|
|
S.Diag(Init->getLocStart(), diag::warn_temporary_array_to_pointer_decay)
|
|
<< Init->getSourceRange();
|
|
}
|
|
|
|
QualType DestType = Entity.getType().getNonReferenceType();
|
|
// FIXME: Ugly hack around the fact that Entity.getType() is not
|
|
// the same as Entity.getDecl()->getType() in cases involving type merging,
|
|
// and we want latter when it makes sense.
|
|
if (ResultType)
|
|
*ResultType = Entity.getDecl() ? Entity.getDecl()->getType() :
|
|
Entity.getType();
|
|
|
|
ExprResult CurInit((Expr *)nullptr);
|
|
|
|
// For initialization steps that start with a single initializer,
|
|
// grab the only argument out the Args and place it into the "current"
|
|
// initializer.
|
|
switch (Steps.front().Kind) {
|
|
case SK_ResolveAddressOfOverloadedFunction:
|
|
case SK_CastDerivedToBaseRValue:
|
|
case SK_CastDerivedToBaseXValue:
|
|
case SK_CastDerivedToBaseLValue:
|
|
case SK_BindReference:
|
|
case SK_BindReferenceToTemporary:
|
|
case SK_ExtraneousCopyToTemporary:
|
|
case SK_UserConversion:
|
|
case SK_QualificationConversionLValue:
|
|
case SK_QualificationConversionXValue:
|
|
case SK_QualificationConversionRValue:
|
|
case SK_AtomicConversion:
|
|
case SK_LValueToRValue:
|
|
case SK_ConversionSequence:
|
|
case SK_ConversionSequenceNoNarrowing:
|
|
case SK_ListInitialization:
|
|
case SK_UnwrapInitList:
|
|
case SK_RewrapInitList:
|
|
case SK_CAssignment:
|
|
case SK_StringInit:
|
|
case SK_ObjCObjectConversion:
|
|
case SK_ArrayInit:
|
|
case SK_ParenthesizedArrayInit:
|
|
case SK_PassByIndirectCopyRestore:
|
|
case SK_PassByIndirectRestore:
|
|
case SK_ProduceObjCObject:
|
|
case SK_StdInitializerList:
|
|
case SK_OCLSamplerInit:
|
|
case SK_OCLZeroEvent: {
|
|
assert(Args.size() == 1);
|
|
CurInit = Args[0];
|
|
if (!CurInit.get()) return ExprError();
|
|
break;
|
|
}
|
|
|
|
case SK_ConstructorInitialization:
|
|
case SK_ConstructorInitializationFromList:
|
|
case SK_StdInitializerListConstructorCall:
|
|
case SK_ZeroInitialization:
|
|
break;
|
|
}
|
|
|
|
// Walk through the computed steps for the initialization sequence,
|
|
// performing the specified conversions along the way.
|
|
bool ConstructorInitRequiresZeroInit = false;
|
|
for (step_iterator Step = step_begin(), StepEnd = step_end();
|
|
Step != StepEnd; ++Step) {
|
|
if (CurInit.isInvalid())
|
|
return ExprError();
|
|
|
|
QualType SourceType = CurInit.get() ? CurInit.get()->getType() : QualType();
|
|
|
|
switch (Step->Kind) {
|
|
case SK_ResolveAddressOfOverloadedFunction:
|
|
// Overload resolution determined which function invoke; update the
|
|
// initializer to reflect that choice.
|
|
S.CheckAddressOfMemberAccess(CurInit.get(), Step->Function.FoundDecl);
|
|
if (S.DiagnoseUseOfDecl(Step->Function.FoundDecl, Kind.getLocation()))
|
|
return ExprError();
|
|
CurInit = S.FixOverloadedFunctionReference(CurInit,
|
|
Step->Function.FoundDecl,
|
|
Step->Function.Function);
|
|
break;
|
|
|
|
case SK_CastDerivedToBaseRValue:
|
|
case SK_CastDerivedToBaseXValue:
|
|
case SK_CastDerivedToBaseLValue: {
|
|
// We have a derived-to-base cast that produces either an rvalue or an
|
|
// lvalue. Perform that cast.
|
|
|
|
CXXCastPath BasePath;
|
|
|
|
// Casts to inaccessible base classes are allowed with C-style casts.
|
|
bool IgnoreBaseAccess = Kind.isCStyleOrFunctionalCast();
|
|
if (S.CheckDerivedToBaseConversion(SourceType, Step->Type,
|
|
CurInit.get()->getLocStart(),
|
|
CurInit.get()->getSourceRange(),
|
|
&BasePath, IgnoreBaseAccess))
|
|
return ExprError();
|
|
|
|
ExprValueKind VK =
|
|
Step->Kind == SK_CastDerivedToBaseLValue ?
|
|
VK_LValue :
|
|
(Step->Kind == SK_CastDerivedToBaseXValue ?
|
|
VK_XValue :
|
|
VK_RValue);
|
|
CurInit =
|
|
ImplicitCastExpr::Create(S.Context, Step->Type, CK_DerivedToBase,
|
|
CurInit.get(), &BasePath, VK);
|
|
break;
|
|
}
|
|
|
|
case SK_BindReference:
|
|
// References cannot bind to bit-fields (C++ [dcl.init.ref]p5).
|
|
if (CurInit.get()->refersToBitField()) {
|
|
// We don't necessarily have an unambiguous source bit-field.
|
|
FieldDecl *BitField = CurInit.get()->getSourceBitField();
|
|
S.Diag(Kind.getLocation(), diag::err_reference_bind_to_bitfield)
|
|
<< Entity.getType().isVolatileQualified()
|
|
<< (BitField ? BitField->getDeclName() : DeclarationName())
|
|
<< (BitField != nullptr)
|
|
<< CurInit.get()->getSourceRange();
|
|
if (BitField)
|
|
S.Diag(BitField->getLocation(), diag::note_bitfield_decl);
|
|
|
|
return ExprError();
|
|
}
|
|
|
|
if (CurInit.get()->refersToVectorElement()) {
|
|
// References cannot bind to vector elements.
|
|
S.Diag(Kind.getLocation(), diag::err_reference_bind_to_vector_element)
|
|
<< Entity.getType().isVolatileQualified()
|
|
<< CurInit.get()->getSourceRange();
|
|
PrintInitLocationNote(S, Entity);
|
|
return ExprError();
|
|
}
|
|
|
|
// Reference binding does not have any corresponding ASTs.
|
|
|
|
// Check exception specifications
|
|
if (S.CheckExceptionSpecCompatibility(CurInit.get(), DestType))
|
|
return ExprError();
|
|
|
|
// Even though we didn't materialize a temporary, the binding may still
|
|
// extend the lifetime of a temporary. This happens if we bind a reference
|
|
// to the result of a cast to reference type.
|
|
if (const InitializedEntity *ExtendingEntity =
|
|
getEntityForTemporaryLifetimeExtension(&Entity))
|
|
if (performReferenceExtension(CurInit.get(), ExtendingEntity))
|
|
warnOnLifetimeExtension(S, Entity, CurInit.get(),
|
|
/*IsInitializerList=*/false,
|
|
ExtendingEntity->getDecl());
|
|
|
|
break;
|
|
|
|
case SK_BindReferenceToTemporary: {
|
|
// Make sure the "temporary" is actually an rvalue.
|
|
assert(CurInit.get()->isRValue() && "not a temporary");
|
|
|
|
// Check exception specifications
|
|
if (S.CheckExceptionSpecCompatibility(CurInit.get(), DestType))
|
|
return ExprError();
|
|
|
|
// Materialize the temporary into memory.
|
|
MaterializeTemporaryExpr *MTE = new (S.Context) MaterializeTemporaryExpr(
|
|
Entity.getType().getNonReferenceType(), CurInit.get(),
|
|
Entity.getType()->isLValueReferenceType());
|
|
|
|
// Maybe lifetime-extend the temporary's subobjects to match the
|
|
// entity's lifetime.
|
|
if (const InitializedEntity *ExtendingEntity =
|
|
getEntityForTemporaryLifetimeExtension(&Entity))
|
|
if (performReferenceExtension(MTE, ExtendingEntity))
|
|
warnOnLifetimeExtension(S, Entity, CurInit.get(), /*IsInitializerList=*/false,
|
|
ExtendingEntity->getDecl());
|
|
|
|
// If we're binding to an Objective-C object that has lifetime, we
|
|
// need cleanups. Likewise if we're extending this temporary to automatic
|
|
// storage duration -- we need to register its cleanup during the
|
|
// full-expression's cleanups.
|
|
if ((S.getLangOpts().ObjCAutoRefCount &&
|
|
MTE->getType()->isObjCLifetimeType()) ||
|
|
(MTE->getStorageDuration() == SD_Automatic &&
|
|
MTE->getType().isDestructedType()))
|
|
S.ExprNeedsCleanups = true;
|
|
|
|
CurInit = MTE;
|
|
break;
|
|
}
|
|
|
|
case SK_ExtraneousCopyToTemporary:
|
|
CurInit = CopyObject(S, Step->Type, Entity, CurInit,
|
|
/*IsExtraneousCopy=*/true);
|
|
break;
|
|
|
|
case SK_UserConversion: {
|
|
// We have a user-defined conversion that invokes either a constructor
|
|
// or a conversion function.
|
|
CastKind CastKind;
|
|
bool IsCopy = false;
|
|
FunctionDecl *Fn = Step->Function.Function;
|
|
DeclAccessPair FoundFn = Step->Function.FoundDecl;
|
|
bool HadMultipleCandidates = Step->Function.HadMultipleCandidates;
|
|
bool CreatedObject = false;
|
|
if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Fn)) {
|
|
// Build a call to the selected constructor.
|
|
SmallVector<Expr*, 8> ConstructorArgs;
|
|
SourceLocation Loc = CurInit.get()->getLocStart();
|
|
CurInit.get(); // Ownership transferred into MultiExprArg, below.
|
|
|
|
// Determine the arguments required to actually perform the constructor
|
|
// call.
|
|
Expr *Arg = CurInit.get();
|
|
if (S.CompleteConstructorCall(Constructor,
|
|
MultiExprArg(&Arg, 1),
|
|
Loc, ConstructorArgs))
|
|
return ExprError();
|
|
|
|
// Build an expression that constructs a temporary.
|
|
CurInit = S.BuildCXXConstructExpr(Loc, Step->Type, Constructor,
|
|
ConstructorArgs,
|
|
HadMultipleCandidates,
|
|
/*ListInit*/ false,
|
|
/*StdInitListInit*/ false,
|
|
/*ZeroInit*/ false,
|
|
CXXConstructExpr::CK_Complete,
|
|
SourceRange());
|
|
if (CurInit.isInvalid())
|
|
return ExprError();
|
|
|
|
S.CheckConstructorAccess(Kind.getLocation(), Constructor, Entity,
|
|
FoundFn.getAccess());
|
|
if (S.DiagnoseUseOfDecl(FoundFn, Kind.getLocation()))
|
|
return ExprError();
|
|
|
|
CastKind = CK_ConstructorConversion;
|
|
QualType Class = S.Context.getTypeDeclType(Constructor->getParent());
|
|
if (S.Context.hasSameUnqualifiedType(SourceType, Class) ||
|
|
S.IsDerivedFrom(SourceType, Class))
|
|
IsCopy = true;
|
|
|
|
CreatedObject = true;
|
|
} else {
|
|
// Build a call to the conversion function.
|
|
CXXConversionDecl *Conversion = cast<CXXConversionDecl>(Fn);
|
|
S.CheckMemberOperatorAccess(Kind.getLocation(), CurInit.get(), nullptr,
|
|
FoundFn);
|
|
if (S.DiagnoseUseOfDecl(FoundFn, Kind.getLocation()))
|
|
return ExprError();
|
|
|
|
// FIXME: Should we move this initialization into a separate
|
|
// derived-to-base conversion? I believe the answer is "no", because
|
|
// we don't want to turn off access control here for c-style casts.
|
|
ExprResult CurInitExprRes =
|
|
S.PerformObjectArgumentInitialization(CurInit.get(),
|
|
/*Qualifier=*/nullptr,
|
|
FoundFn, Conversion);
|
|
if(CurInitExprRes.isInvalid())
|
|
return ExprError();
|
|
CurInit = CurInitExprRes;
|
|
|
|
// Build the actual call to the conversion function.
|
|
CurInit = S.BuildCXXMemberCallExpr(CurInit.get(), FoundFn, Conversion,
|
|
HadMultipleCandidates);
|
|
if (CurInit.isInvalid() || !CurInit.get())
|
|
return ExprError();
|
|
|
|
CastKind = CK_UserDefinedConversion;
|
|
|
|
CreatedObject = Conversion->getReturnType()->isRecordType();
|
|
}
|
|
|
|
bool RequiresCopy = !IsCopy && !isReferenceBinding(Steps.back());
|
|
bool MaybeBindToTemp = RequiresCopy || shouldBindAsTemporary(Entity);
|
|
|
|
if (!MaybeBindToTemp && CreatedObject && shouldDestroyTemporary(Entity)) {
|
|
QualType T = CurInit.get()->getType();
|
|
if (const RecordType *Record = T->getAs<RecordType>()) {
|
|
CXXDestructorDecl *Destructor
|
|
= S.LookupDestructor(cast<CXXRecordDecl>(Record->getDecl()));
|
|
S.CheckDestructorAccess(CurInit.get()->getLocStart(), Destructor,
|
|
S.PDiag(diag::err_access_dtor_temp) << T);
|
|
S.MarkFunctionReferenced(CurInit.get()->getLocStart(), Destructor);
|
|
if (S.DiagnoseUseOfDecl(Destructor, CurInit.get()->getLocStart()))
|
|
return ExprError();
|
|
}
|
|
}
|
|
|
|
CurInit = ImplicitCastExpr::Create(S.Context, CurInit.get()->getType(),
|
|
CastKind, CurInit.get(), nullptr,
|
|
CurInit.get()->getValueKind());
|
|
if (MaybeBindToTemp)
|
|
CurInit = S.MaybeBindToTemporary(CurInit.getAs<Expr>());
|
|
if (RequiresCopy)
|
|
CurInit = CopyObject(S, Entity.getType().getNonReferenceType(), Entity,
|
|
CurInit, /*IsExtraneousCopy=*/false);
|
|
break;
|
|
}
|
|
|
|
case SK_QualificationConversionLValue:
|
|
case SK_QualificationConversionXValue:
|
|
case SK_QualificationConversionRValue: {
|
|
// Perform a qualification conversion; these can never go wrong.
|
|
ExprValueKind VK =
|
|
Step->Kind == SK_QualificationConversionLValue ?
|
|
VK_LValue :
|
|
(Step->Kind == SK_QualificationConversionXValue ?
|
|
VK_XValue :
|
|
VK_RValue);
|
|
CurInit = S.ImpCastExprToType(CurInit.get(), Step->Type, CK_NoOp, VK);
|
|
break;
|
|
}
|
|
|
|
case SK_AtomicConversion: {
|
|
assert(CurInit.get()->isRValue() && "cannot convert glvalue to atomic");
|
|
CurInit = S.ImpCastExprToType(CurInit.get(), Step->Type,
|
|
CK_NonAtomicToAtomic, VK_RValue);
|
|
break;
|
|
}
|
|
|
|
case SK_LValueToRValue: {
|
|
assert(CurInit.get()->isGLValue() && "cannot load from a prvalue");
|
|
CurInit = ImplicitCastExpr::Create(S.Context, Step->Type,
|
|
CK_LValueToRValue, CurInit.get(),
|
|
/*BasePath=*/nullptr, VK_RValue);
|
|
break;
|
|
}
|
|
|
|
case SK_ConversionSequence:
|
|
case SK_ConversionSequenceNoNarrowing: {
|
|
Sema::CheckedConversionKind CCK
|
|
= Kind.isCStyleCast()? Sema::CCK_CStyleCast
|
|
: Kind.isFunctionalCast()? Sema::CCK_FunctionalCast
|
|
: Kind.isExplicitCast()? Sema::CCK_OtherCast
|
|
: Sema::CCK_ImplicitConversion;
|
|
ExprResult CurInitExprRes =
|
|
S.PerformImplicitConversion(CurInit.get(), Step->Type, *Step->ICS,
|
|
getAssignmentAction(Entity), CCK);
|
|
if (CurInitExprRes.isInvalid())
|
|
return ExprError();
|
|
CurInit = CurInitExprRes;
|
|
|
|
if (Step->Kind == SK_ConversionSequenceNoNarrowing &&
|
|
S.getLangOpts().CPlusPlus && !CurInit.get()->isValueDependent())
|
|
DiagnoseNarrowingInInitList(S, *Step->ICS, SourceType, Entity.getType(),
|
|
CurInit.get());
|
|
break;
|
|
}
|
|
|
|
case SK_ListInitialization: {
|
|
InitListExpr *InitList = cast<InitListExpr>(CurInit.get());
|
|
// If we're not initializing the top-level entity, we need to create an
|
|
// InitializeTemporary entity for our target type.
|
|
QualType Ty = Step->Type;
|
|
bool IsTemporary = !S.Context.hasSameType(Entity.getType(), Ty);
|
|
InitializedEntity TempEntity = InitializedEntity::InitializeTemporary(Ty);
|
|
InitializedEntity InitEntity = IsTemporary ? TempEntity : Entity;
|
|
InitListChecker PerformInitList(S, InitEntity,
|
|
InitList, Ty, /*VerifyOnly=*/false);
|
|
if (PerformInitList.HadError())
|
|
return ExprError();
|
|
|
|
// Hack: We must update *ResultType if available in order to set the
|
|
// bounds of arrays, e.g. in 'int ar[] = {1, 2, 3};'.
|
|
// Worst case: 'const int (&arref)[] = {1, 2, 3};'.
|
|
if (ResultType &&
|
|
ResultType->getNonReferenceType()->isIncompleteArrayType()) {
|
|
if ((*ResultType)->isRValueReferenceType())
|
|
Ty = S.Context.getRValueReferenceType(Ty);
|
|
else if ((*ResultType)->isLValueReferenceType())
|
|
Ty = S.Context.getLValueReferenceType(Ty,
|
|
(*ResultType)->getAs<LValueReferenceType>()->isSpelledAsLValue());
|
|
*ResultType = Ty;
|
|
}
|
|
|
|
InitListExpr *StructuredInitList =
|
|
PerformInitList.getFullyStructuredList();
|
|
CurInit.get();
|
|
CurInit = shouldBindAsTemporary(InitEntity)
|
|
? S.MaybeBindToTemporary(StructuredInitList)
|
|
: StructuredInitList;
|
|
break;
|
|
}
|
|
|
|
case SK_ConstructorInitializationFromList: {
|
|
// When an initializer list is passed for a parameter of type "reference
|
|
// to object", we don't get an EK_Temporary entity, but instead an
|
|
// EK_Parameter entity with reference type.
|
|
// FIXME: This is a hack. What we really should do is create a user
|
|
// conversion step for this case, but this makes it considerably more
|
|
// complicated. For now, this will do.
|
|
InitializedEntity TempEntity = InitializedEntity::InitializeTemporary(
|
|
Entity.getType().getNonReferenceType());
|
|
bool UseTemporary = Entity.getType()->isReferenceType();
|
|
assert(Args.size() == 1 && "expected a single argument for list init");
|
|
InitListExpr *InitList = cast<InitListExpr>(Args[0]);
|
|
S.Diag(InitList->getExprLoc(), diag::warn_cxx98_compat_ctor_list_init)
|
|
<< InitList->getSourceRange();
|
|
MultiExprArg Arg(InitList->getInits(), InitList->getNumInits());
|
|
CurInit = PerformConstructorInitialization(S, UseTemporary ? TempEntity :
|
|
Entity,
|
|
Kind, Arg, *Step,
|
|
ConstructorInitRequiresZeroInit,
|
|
/*IsListInitialization*/true,
|
|
/*IsStdInitListInit*/false,
|
|
InitList->getLBraceLoc(),
|
|
InitList->getRBraceLoc());
|
|
break;
|
|
}
|
|
|
|
case SK_UnwrapInitList:
|
|
CurInit = cast<InitListExpr>(CurInit.get())->getInit(0);
|
|
break;
|
|
|
|
case SK_RewrapInitList: {
|
|
Expr *E = CurInit.get();
|
|
InitListExpr *Syntactic = Step->WrappingSyntacticList;
|
|
InitListExpr *ILE = new (S.Context) InitListExpr(S.Context,
|
|
Syntactic->getLBraceLoc(), E, Syntactic->getRBraceLoc());
|
|
ILE->setSyntacticForm(Syntactic);
|
|
ILE->setType(E->getType());
|
|
ILE->setValueKind(E->getValueKind());
|
|
CurInit = ILE;
|
|
break;
|
|
}
|
|
|
|
case SK_ConstructorInitialization:
|
|
case SK_StdInitializerListConstructorCall: {
|
|
// When an initializer list is passed for a parameter of type "reference
|
|
// to object", we don't get an EK_Temporary entity, but instead an
|
|
// EK_Parameter entity with reference type.
|
|
// FIXME: This is a hack. What we really should do is create a user
|
|
// conversion step for this case, but this makes it considerably more
|
|
// complicated. For now, this will do.
|
|
InitializedEntity TempEntity = InitializedEntity::InitializeTemporary(
|
|
Entity.getType().getNonReferenceType());
|
|
bool UseTemporary = Entity.getType()->isReferenceType();
|
|
bool IsStdInitListInit =
|
|
Step->Kind == SK_StdInitializerListConstructorCall;
|
|
CurInit = PerformConstructorInitialization(
|
|
S, UseTemporary ? TempEntity : Entity, Kind, Args, *Step,
|
|
ConstructorInitRequiresZeroInit,
|
|
/*IsListInitialization*/IsStdInitListInit,
|
|
/*IsStdInitListInitialization*/IsStdInitListInit,
|
|
/*LBraceLoc*/SourceLocation(),
|
|
/*RBraceLoc*/SourceLocation());
|
|
break;
|
|
}
|
|
|
|
case SK_ZeroInitialization: {
|
|
step_iterator NextStep = Step;
|
|
++NextStep;
|
|
if (NextStep != StepEnd &&
|
|
(NextStep->Kind == SK_ConstructorInitialization ||
|
|
NextStep->Kind == SK_ConstructorInitializationFromList)) {
|
|
// The need for zero-initialization is recorded directly into
|
|
// the call to the object's constructor within the next step.
|
|
ConstructorInitRequiresZeroInit = true;
|
|
} else if (Kind.getKind() == InitializationKind::IK_Value &&
|
|
S.getLangOpts().CPlusPlus &&
|
|
!Kind.isImplicitValueInit()) {
|
|
TypeSourceInfo *TSInfo = Entity.getTypeSourceInfo();
|
|
if (!TSInfo)
|
|
TSInfo = S.Context.getTrivialTypeSourceInfo(Step->Type,
|
|
Kind.getRange().getBegin());
|
|
|
|
CurInit = new (S.Context) CXXScalarValueInitExpr(
|
|
TSInfo->getType().getNonLValueExprType(S.Context), TSInfo,
|
|
Kind.getRange().getEnd());
|
|
} else {
|
|
CurInit = new (S.Context) ImplicitValueInitExpr(Step->Type);
|
|
}
|
|
break;
|
|
}
|
|
|
|
case SK_CAssignment: {
|
|
QualType SourceType = CurInit.get()->getType();
|
|
ExprResult Result = CurInit;
|
|
Sema::AssignConvertType ConvTy =
|
|
S.CheckSingleAssignmentConstraints(Step->Type, Result, true,
|
|
Entity.getKind() == InitializedEntity::EK_Parameter_CF_Audited);
|
|
if (Result.isInvalid())
|
|
return ExprError();
|
|
CurInit = Result;
|
|
|
|
// If this is a call, allow conversion to a transparent union.
|
|
ExprResult CurInitExprRes = CurInit;
|
|
if (ConvTy != Sema::Compatible &&
|
|
Entity.isParameterKind() &&
|
|
S.CheckTransparentUnionArgumentConstraints(Step->Type, CurInitExprRes)
|
|
== Sema::Compatible)
|
|
ConvTy = Sema::Compatible;
|
|
if (CurInitExprRes.isInvalid())
|
|
return ExprError();
|
|
CurInit = CurInitExprRes;
|
|
|
|
bool Complained;
|
|
if (S.DiagnoseAssignmentResult(ConvTy, Kind.getLocation(),
|
|
Step->Type, SourceType,
|
|
CurInit.get(),
|
|
getAssignmentAction(Entity, true),
|
|
&Complained)) {
|
|
PrintInitLocationNote(S, Entity);
|
|
return ExprError();
|
|
} else if (Complained)
|
|
PrintInitLocationNote(S, Entity);
|
|
break;
|
|
}
|
|
|
|
case SK_StringInit: {
|
|
QualType Ty = Step->Type;
|
|
CheckStringInit(CurInit.get(), ResultType ? *ResultType : Ty,
|
|
S.Context.getAsArrayType(Ty), S);
|
|
break;
|
|
}
|
|
|
|
case SK_ObjCObjectConversion:
|
|
CurInit = S.ImpCastExprToType(CurInit.get(), Step->Type,
|
|
CK_ObjCObjectLValueCast,
|
|
CurInit.get()->getValueKind());
|
|
break;
|
|
|
|
case SK_ArrayInit:
|
|
// Okay: we checked everything before creating this step. Note that
|
|
// this is a GNU extension.
|
|
S.Diag(Kind.getLocation(), diag::ext_array_init_copy)
|
|
<< Step->Type << CurInit.get()->getType()
|
|
<< CurInit.get()->getSourceRange();
|
|
|
|
// If the destination type is an incomplete array type, update the
|
|
// type accordingly.
|
|
if (ResultType) {
|
|
if (const IncompleteArrayType *IncompleteDest
|
|
= S.Context.getAsIncompleteArrayType(Step->Type)) {
|
|
if (const ConstantArrayType *ConstantSource
|
|
= S.Context.getAsConstantArrayType(CurInit.get()->getType())) {
|
|
*ResultType = S.Context.getConstantArrayType(
|
|
IncompleteDest->getElementType(),
|
|
ConstantSource->getSize(),
|
|
ArrayType::Normal, 0);
|
|
}
|
|
}
|
|
}
|
|
break;
|
|
|
|
case SK_ParenthesizedArrayInit:
|
|
// Okay: we checked everything before creating this step. Note that
|
|
// this is a GNU extension.
|
|
S.Diag(Kind.getLocation(), diag::ext_array_init_parens)
|
|
<< CurInit.get()->getSourceRange();
|
|
break;
|
|
|
|
case SK_PassByIndirectCopyRestore:
|
|
case SK_PassByIndirectRestore:
|
|
checkIndirectCopyRestoreSource(S, CurInit.get());
|
|
CurInit = new (S.Context) ObjCIndirectCopyRestoreExpr(
|
|
CurInit.get(), Step->Type,
|
|
Step->Kind == SK_PassByIndirectCopyRestore);
|
|
break;
|
|
|
|
case SK_ProduceObjCObject:
|
|
CurInit =
|
|
ImplicitCastExpr::Create(S.Context, Step->Type, CK_ARCProduceObject,
|
|
CurInit.get(), nullptr, VK_RValue);
|
|
break;
|
|
|
|
case SK_StdInitializerList: {
|
|
S.Diag(CurInit.get()->getExprLoc(),
|
|
diag::warn_cxx98_compat_initializer_list_init)
|
|
<< CurInit.get()->getSourceRange();
|
|
|
|
// Materialize the temporary into memory.
|
|
MaterializeTemporaryExpr *MTE = new (S.Context)
|
|
MaterializeTemporaryExpr(CurInit.get()->getType(), CurInit.get(),
|
|
/*BoundToLvalueReference=*/false);
|
|
|
|
// Maybe lifetime-extend the array temporary's subobjects to match the
|
|
// entity's lifetime.
|
|
if (const InitializedEntity *ExtendingEntity =
|
|
getEntityForTemporaryLifetimeExtension(&Entity))
|
|
if (performReferenceExtension(MTE, ExtendingEntity))
|
|
warnOnLifetimeExtension(S, Entity, CurInit.get(),
|
|
/*IsInitializerList=*/true,
|
|
ExtendingEntity->getDecl());
|
|
|
|
// Wrap it in a construction of a std::initializer_list<T>.
|
|
CurInit = new (S.Context) CXXStdInitializerListExpr(Step->Type, MTE);
|
|
|
|
// Bind the result, in case the library has given initializer_list a
|
|
// non-trivial destructor.
|
|
if (shouldBindAsTemporary(Entity))
|
|
CurInit = S.MaybeBindToTemporary(CurInit.get());
|
|
break;
|
|
}
|
|
|
|
case SK_OCLSamplerInit: {
|
|
assert(Step->Type->isSamplerT() &&
|
|
"Sampler initialization on non-sampler type.");
|
|
|
|
QualType SourceType = CurInit.get()->getType();
|
|
|
|
if (Entity.isParameterKind()) {
|
|
if (!SourceType->isSamplerT())
|
|
S.Diag(Kind.getLocation(), diag::err_sampler_argument_required)
|
|
<< SourceType;
|
|
} else if (Entity.getKind() != InitializedEntity::EK_Variable) {
|
|
llvm_unreachable("Invalid EntityKind!");
|
|
}
|
|
|
|
break;
|
|
}
|
|
case SK_OCLZeroEvent: {
|
|
assert(Step->Type->isEventT() &&
|
|
"Event initialization on non-event type.");
|
|
|
|
CurInit = S.ImpCastExprToType(CurInit.get(), Step->Type,
|
|
CK_ZeroToOCLEvent,
|
|
CurInit.get()->getValueKind());
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
// Diagnose non-fatal problems with the completed initialization.
|
|
if (Entity.getKind() == InitializedEntity::EK_Member &&
|
|
cast<FieldDecl>(Entity.getDecl())->isBitField())
|
|
S.CheckBitFieldInitialization(Kind.getLocation(),
|
|
cast<FieldDecl>(Entity.getDecl()),
|
|
CurInit.get());
|
|
|
|
return CurInit;
|
|
}
|
|
|
|
/// Somewhere within T there is an uninitialized reference subobject.
|
|
/// Dig it out and diagnose it.
|
|
static bool DiagnoseUninitializedReference(Sema &S, SourceLocation Loc,
|
|
QualType T) {
|
|
if (T->isReferenceType()) {
|
|
S.Diag(Loc, diag::err_reference_without_init)
|
|
<< T.getNonReferenceType();
|
|
return true;
|
|
}
|
|
|
|
CXXRecordDecl *RD = T->getBaseElementTypeUnsafe()->getAsCXXRecordDecl();
|
|
if (!RD || !RD->hasUninitializedReferenceMember())
|
|
return false;
|
|
|
|
for (const auto *FI : RD->fields()) {
|
|
if (FI->isUnnamedBitfield())
|
|
continue;
|
|
|
|
if (DiagnoseUninitializedReference(S, FI->getLocation(), FI->getType())) {
|
|
S.Diag(Loc, diag::note_value_initialization_here) << RD;
|
|
return true;
|
|
}
|
|
}
|
|
|
|
for (const auto &BI : RD->bases()) {
|
|
if (DiagnoseUninitializedReference(S, BI.getLocStart(), BI.getType())) {
|
|
S.Diag(Loc, diag::note_value_initialization_here) << RD;
|
|
return true;
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// Diagnose initialization failures
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
/// Emit notes associated with an initialization that failed due to a
|
|
/// "simple" conversion failure.
|
|
static void emitBadConversionNotes(Sema &S, const InitializedEntity &entity,
|
|
Expr *op) {
|
|
QualType destType = entity.getType();
|
|
if (destType.getNonReferenceType()->isObjCObjectPointerType() &&
|
|
op->getType()->isObjCObjectPointerType()) {
|
|
|
|
// Emit a possible note about the conversion failing because the
|
|
// operand is a message send with a related result type.
|
|
S.EmitRelatedResultTypeNote(op);
|
|
|
|
// Emit a possible note about a return failing because we're
|
|
// expecting a related result type.
|
|
if (entity.getKind() == InitializedEntity::EK_Result)
|
|
S.EmitRelatedResultTypeNoteForReturn(destType);
|
|
}
|
|
}
|
|
|
|
static void diagnoseListInit(Sema &S, const InitializedEntity &Entity,
|
|
InitListExpr *InitList) {
|
|
QualType DestType = Entity.getType();
|
|
|
|
QualType E;
|
|
if (S.getLangOpts().CPlusPlus11 && S.isStdInitializerList(DestType, &E)) {
|
|
QualType ArrayType = S.Context.getConstantArrayType(
|
|
E.withConst(),
|
|
llvm::APInt(S.Context.getTypeSize(S.Context.getSizeType()),
|
|
InitList->getNumInits()),
|
|
clang::ArrayType::Normal, 0);
|
|
InitializedEntity HiddenArray =
|
|
InitializedEntity::InitializeTemporary(ArrayType);
|
|
return diagnoseListInit(S, HiddenArray, InitList);
|
|
}
|
|
|
|
if (DestType->isReferenceType()) {
|
|
// A list-initialization failure for a reference means that we tried to
|
|
// create a temporary of the inner type (per [dcl.init.list]p3.6) and the
|
|
// inner initialization failed.
|
|
QualType T = DestType->getAs<ReferenceType>()->getPointeeType();
|
|
diagnoseListInit(S, InitializedEntity::InitializeTemporary(T), InitList);
|
|
SourceLocation Loc = InitList->getLocStart();
|
|
if (auto *D = Entity.getDecl())
|
|
Loc = D->getLocation();
|
|
S.Diag(Loc, diag::note_in_reference_temporary_list_initializer) << T;
|
|
return;
|
|
}
|
|
|
|
InitListChecker DiagnoseInitList(S, Entity, InitList, DestType,
|
|
/*VerifyOnly=*/false);
|
|
assert(DiagnoseInitList.HadError() &&
|
|
"Inconsistent init list check result.");
|
|
}
|
|
|
|
/// Prints a fixit for adding a null initializer for |Entity|. Call this only
|
|
/// right after emitting a diagnostic.
|
|
static void maybeEmitZeroInitializationFixit(Sema &S,
|
|
InitializationSequence &Sequence,
|
|
const InitializedEntity &Entity) {
|
|
if (Entity.getKind() != InitializedEntity::EK_Variable)
|
|
return;
|
|
|
|
VarDecl *VD = cast<VarDecl>(Entity.getDecl());
|
|
if (VD->getInit() || VD->getLocEnd().isMacroID())
|
|
return;
|
|
|
|
QualType VariableTy = VD->getType().getCanonicalType();
|
|
SourceLocation Loc = S.getLocForEndOfToken(VD->getLocEnd());
|
|
std::string Init = S.getFixItZeroInitializerForType(VariableTy, Loc);
|
|
|
|
S.Diag(Loc, diag::note_add_initializer)
|
|
<< VD << FixItHint::CreateInsertion(Loc, Init);
|
|
}
|
|
|
|
bool InitializationSequence::Diagnose(Sema &S,
|
|
const InitializedEntity &Entity,
|
|
const InitializationKind &Kind,
|
|
ArrayRef<Expr *> Args) {
|
|
if (!Failed())
|
|
return false;
|
|
|
|
QualType DestType = Entity.getType();
|
|
switch (Failure) {
|
|
case FK_TooManyInitsForReference:
|
|
// FIXME: Customize for the initialized entity?
|
|
if (Args.empty()) {
|
|
// Dig out the reference subobject which is uninitialized and diagnose it.
|
|
// If this is value-initialization, this could be nested some way within
|
|
// the target type.
|
|
assert(Kind.getKind() == InitializationKind::IK_Value ||
|
|
DestType->isReferenceType());
|
|
bool Diagnosed =
|
|
DiagnoseUninitializedReference(S, Kind.getLocation(), DestType);
|
|
assert(Diagnosed && "couldn't find uninitialized reference to diagnose");
|
|
(void)Diagnosed;
|
|
} else // FIXME: diagnostic below could be better!
|
|
S.Diag(Kind.getLocation(), diag::err_reference_has_multiple_inits)
|
|
<< SourceRange(Args.front()->getLocStart(), Args.back()->getLocEnd());
|
|
break;
|
|
|
|
case FK_ArrayNeedsInitList:
|
|
S.Diag(Kind.getLocation(), diag::err_array_init_not_init_list) << 0;
|
|
break;
|
|
case FK_ArrayNeedsInitListOrStringLiteral:
|
|
S.Diag(Kind.getLocation(), diag::err_array_init_not_init_list) << 1;
|
|
break;
|
|
case FK_ArrayNeedsInitListOrWideStringLiteral:
|
|
S.Diag(Kind.getLocation(), diag::err_array_init_not_init_list) << 2;
|
|
break;
|
|
case FK_NarrowStringIntoWideCharArray:
|
|
S.Diag(Kind.getLocation(), diag::err_array_init_narrow_string_into_wchar);
|
|
break;
|
|
case FK_WideStringIntoCharArray:
|
|
S.Diag(Kind.getLocation(), diag::err_array_init_wide_string_into_char);
|
|
break;
|
|
case FK_IncompatWideStringIntoWideChar:
|
|
S.Diag(Kind.getLocation(),
|
|
diag::err_array_init_incompat_wide_string_into_wchar);
|
|
break;
|
|
case FK_ArrayTypeMismatch:
|
|
case FK_NonConstantArrayInit:
|
|
S.Diag(Kind.getLocation(),
|
|
(Failure == FK_ArrayTypeMismatch
|
|
? diag::err_array_init_different_type
|
|
: diag::err_array_init_non_constant_array))
|
|
<< DestType.getNonReferenceType()
|
|
<< Args[0]->getType()
|
|
<< Args[0]->getSourceRange();
|
|
break;
|
|
|
|
case FK_VariableLengthArrayHasInitializer:
|
|
S.Diag(Kind.getLocation(), diag::err_variable_object_no_init)
|
|
<< Args[0]->getSourceRange();
|
|
break;
|
|
|
|
case FK_AddressOfOverloadFailed: {
|
|
DeclAccessPair Found;
|
|
S.ResolveAddressOfOverloadedFunction(Args[0],
|
|
DestType.getNonReferenceType(),
|
|
true,
|
|
Found);
|
|
break;
|
|
}
|
|
|
|
case FK_ReferenceInitOverloadFailed:
|
|
case FK_UserConversionOverloadFailed:
|
|
switch (FailedOverloadResult) {
|
|
case OR_Ambiguous:
|
|
if (Failure == FK_UserConversionOverloadFailed)
|
|
S.Diag(Kind.getLocation(), diag::err_typecheck_ambiguous_condition)
|
|
<< Args[0]->getType() << DestType
|
|
<< Args[0]->getSourceRange();
|
|
else
|
|
S.Diag(Kind.getLocation(), diag::err_ref_init_ambiguous)
|
|
<< DestType << Args[0]->getType()
|
|
<< Args[0]->getSourceRange();
|
|
|
|
FailedCandidateSet.NoteCandidates(S, OCD_ViableCandidates, Args);
|
|
break;
|
|
|
|
case OR_No_Viable_Function:
|
|
if (!S.RequireCompleteType(Kind.getLocation(),
|
|
DestType.getNonReferenceType(),
|
|
diag::err_typecheck_nonviable_condition_incomplete,
|
|
Args[0]->getType(), Args[0]->getSourceRange()))
|
|
S.Diag(Kind.getLocation(), diag::err_typecheck_nonviable_condition)
|
|
<< Args[0]->getType() << Args[0]->getSourceRange()
|
|
<< DestType.getNonReferenceType();
|
|
|
|
FailedCandidateSet.NoteCandidates(S, OCD_AllCandidates, Args);
|
|
break;
|
|
|
|
case OR_Deleted: {
|
|
S.Diag(Kind.getLocation(), diag::err_typecheck_deleted_function)
|
|
<< Args[0]->getType() << DestType.getNonReferenceType()
|
|
<< Args[0]->getSourceRange();
|
|
OverloadCandidateSet::iterator Best;
|
|
OverloadingResult Ovl
|
|
= FailedCandidateSet.BestViableFunction(S, Kind.getLocation(), Best,
|
|
true);
|
|
if (Ovl == OR_Deleted) {
|
|
S.NoteDeletedFunction(Best->Function);
|
|
} else {
|
|
llvm_unreachable("Inconsistent overload resolution?");
|
|
}
|
|
break;
|
|
}
|
|
|
|
case OR_Success:
|
|
llvm_unreachable("Conversion did not fail!");
|
|
}
|
|
break;
|
|
|
|
case FK_NonConstLValueReferenceBindingToTemporary:
|
|
if (isa<InitListExpr>(Args[0])) {
|
|
S.Diag(Kind.getLocation(),
|
|
diag::err_lvalue_reference_bind_to_initlist)
|
|
<< DestType.getNonReferenceType().isVolatileQualified()
|
|
<< DestType.getNonReferenceType()
|
|
<< Args[0]->getSourceRange();
|
|
break;
|
|
}
|
|
// Intentional fallthrough
|
|
|
|
case FK_NonConstLValueReferenceBindingToUnrelated:
|
|
S.Diag(Kind.getLocation(),
|
|
Failure == FK_NonConstLValueReferenceBindingToTemporary
|
|
? diag::err_lvalue_reference_bind_to_temporary
|
|
: diag::err_lvalue_reference_bind_to_unrelated)
|
|
<< DestType.getNonReferenceType().isVolatileQualified()
|
|
<< DestType.getNonReferenceType()
|
|
<< Args[0]->getType()
|
|
<< Args[0]->getSourceRange();
|
|
break;
|
|
|
|
case FK_RValueReferenceBindingToLValue:
|
|
S.Diag(Kind.getLocation(), diag::err_lvalue_to_rvalue_ref)
|
|
<< DestType.getNonReferenceType() << Args[0]->getType()
|
|
<< Args[0]->getSourceRange();
|
|
break;
|
|
|
|
case FK_ReferenceInitDropsQualifiers:
|
|
S.Diag(Kind.getLocation(), diag::err_reference_bind_drops_quals)
|
|
<< DestType.getNonReferenceType()
|
|
<< Args[0]->getType()
|
|
<< Args[0]->getSourceRange();
|
|
break;
|
|
|
|
case FK_ReferenceInitFailed:
|
|
S.Diag(Kind.getLocation(), diag::err_reference_bind_failed)
|
|
<< DestType.getNonReferenceType()
|
|
<< Args[0]->isLValue()
|
|
<< Args[0]->getType()
|
|
<< Args[0]->getSourceRange();
|
|
emitBadConversionNotes(S, Entity, Args[0]);
|
|
break;
|
|
|
|
case FK_ConversionFailed: {
|
|
QualType FromType = Args[0]->getType();
|
|
PartialDiagnostic PDiag = S.PDiag(diag::err_init_conversion_failed)
|
|
<< (int)Entity.getKind()
|
|
<< DestType
|
|
<< Args[0]->isLValue()
|
|
<< FromType
|
|
<< Args[0]->getSourceRange();
|
|
S.HandleFunctionTypeMismatch(PDiag, FromType, DestType);
|
|
S.Diag(Kind.getLocation(), PDiag);
|
|
emitBadConversionNotes(S, Entity, Args[0]);
|
|
break;
|
|
}
|
|
|
|
case FK_ConversionFromPropertyFailed:
|
|
// No-op. This error has already been reported.
|
|
break;
|
|
|
|
case FK_TooManyInitsForScalar: {
|
|
SourceRange R;
|
|
|
|
if (InitListExpr *InitList = dyn_cast<InitListExpr>(Args[0]))
|
|
R = SourceRange(InitList->getInit(0)->getLocEnd(),
|
|
InitList->getLocEnd());
|
|
else
|
|
R = SourceRange(Args.front()->getLocEnd(), Args.back()->getLocEnd());
|
|
|
|
R.setBegin(S.getLocForEndOfToken(R.getBegin()));
|
|
if (Kind.isCStyleOrFunctionalCast())
|
|
S.Diag(Kind.getLocation(), diag::err_builtin_func_cast_more_than_one_arg)
|
|
<< R;
|
|
else
|
|
S.Diag(Kind.getLocation(), diag::err_excess_initializers)
|
|
<< /*scalar=*/2 << R;
|
|
break;
|
|
}
|
|
|
|
case FK_ReferenceBindingToInitList:
|
|
S.Diag(Kind.getLocation(), diag::err_reference_bind_init_list)
|
|
<< DestType.getNonReferenceType() << Args[0]->getSourceRange();
|
|
break;
|
|
|
|
case FK_InitListBadDestinationType:
|
|
S.Diag(Kind.getLocation(), diag::err_init_list_bad_dest_type)
|
|
<< (DestType->isRecordType()) << DestType << Args[0]->getSourceRange();
|
|
break;
|
|
|
|
case FK_ListConstructorOverloadFailed:
|
|
case FK_ConstructorOverloadFailed: {
|
|
SourceRange ArgsRange;
|
|
if (Args.size())
|
|
ArgsRange = SourceRange(Args.front()->getLocStart(),
|
|
Args.back()->getLocEnd());
|
|
|
|
if (Failure == FK_ListConstructorOverloadFailed) {
|
|
assert(Args.size() == 1 &&
|
|
"List construction from other than 1 argument.");
|
|
InitListExpr *InitList = cast<InitListExpr>(Args[0]);
|
|
Args = MultiExprArg(InitList->getInits(), InitList->getNumInits());
|
|
}
|
|
|
|
// FIXME: Using "DestType" for the entity we're printing is probably
|
|
// bad.
|
|
switch (FailedOverloadResult) {
|
|
case OR_Ambiguous:
|
|
S.Diag(Kind.getLocation(), diag::err_ovl_ambiguous_init)
|
|
<< DestType << ArgsRange;
|
|
FailedCandidateSet.NoteCandidates(S, OCD_ViableCandidates, Args);
|
|
break;
|
|
|
|
case OR_No_Viable_Function:
|
|
if (Kind.getKind() == InitializationKind::IK_Default &&
|
|
(Entity.getKind() == InitializedEntity::EK_Base ||
|
|
Entity.getKind() == InitializedEntity::EK_Member) &&
|
|
isa<CXXConstructorDecl>(S.CurContext)) {
|
|
// This is implicit default initialization of a member or
|
|
// base within a constructor. If no viable function was
|
|
// found, notify the user that she needs to explicitly
|
|
// initialize this base/member.
|
|
CXXConstructorDecl *Constructor
|
|
= cast<CXXConstructorDecl>(S.CurContext);
|
|
if (Entity.getKind() == InitializedEntity::EK_Base) {
|
|
S.Diag(Kind.getLocation(), diag::err_missing_default_ctor)
|
|
<< (Constructor->getInheritedConstructor() ? 2 :
|
|
Constructor->isImplicit() ? 1 : 0)
|
|
<< S.Context.getTypeDeclType(Constructor->getParent())
|
|
<< /*base=*/0
|
|
<< Entity.getType();
|
|
|
|
RecordDecl *BaseDecl
|
|
= Entity.getBaseSpecifier()->getType()->getAs<RecordType>()
|
|
->getDecl();
|
|
S.Diag(BaseDecl->getLocation(), diag::note_previous_decl)
|
|
<< S.Context.getTagDeclType(BaseDecl);
|
|
} else {
|
|
S.Diag(Kind.getLocation(), diag::err_missing_default_ctor)
|
|
<< (Constructor->getInheritedConstructor() ? 2 :
|
|
Constructor->isImplicit() ? 1 : 0)
|
|
<< S.Context.getTypeDeclType(Constructor->getParent())
|
|
<< /*member=*/1
|
|
<< Entity.getName();
|
|
S.Diag(Entity.getDecl()->getLocation(),
|
|
diag::note_member_declared_at);
|
|
|
|
if (const RecordType *Record
|
|
= Entity.getType()->getAs<RecordType>())
|
|
S.Diag(Record->getDecl()->getLocation(),
|
|
diag::note_previous_decl)
|
|
<< S.Context.getTagDeclType(Record->getDecl());
|
|
}
|
|
break;
|
|
}
|
|
|
|
S.Diag(Kind.getLocation(), diag::err_ovl_no_viable_function_in_init)
|
|
<< DestType << ArgsRange;
|
|
FailedCandidateSet.NoteCandidates(S, OCD_AllCandidates, Args);
|
|
break;
|
|
|
|
case OR_Deleted: {
|
|
OverloadCandidateSet::iterator Best;
|
|
OverloadingResult Ovl
|
|
= FailedCandidateSet.BestViableFunction(S, Kind.getLocation(), Best);
|
|
if (Ovl != OR_Deleted) {
|
|
S.Diag(Kind.getLocation(), diag::err_ovl_deleted_init)
|
|
<< true << DestType << ArgsRange;
|
|
llvm_unreachable("Inconsistent overload resolution?");
|
|
break;
|
|
}
|
|
|
|
// If this is a defaulted or implicitly-declared function, then
|
|
// it was implicitly deleted. Make it clear that the deletion was
|
|
// implicit.
|
|
if (S.isImplicitlyDeleted(Best->Function))
|
|
S.Diag(Kind.getLocation(), diag::err_ovl_deleted_special_init)
|
|
<< S.getSpecialMember(cast<CXXMethodDecl>(Best->Function))
|
|
<< DestType << ArgsRange;
|
|
else
|
|
S.Diag(Kind.getLocation(), diag::err_ovl_deleted_init)
|
|
<< true << DestType << ArgsRange;
|
|
|
|
S.NoteDeletedFunction(Best->Function);
|
|
break;
|
|
}
|
|
|
|
case OR_Success:
|
|
llvm_unreachable("Conversion did not fail!");
|
|
}
|
|
}
|
|
break;
|
|
|
|
case FK_DefaultInitOfConst:
|
|
if (Entity.getKind() == InitializedEntity::EK_Member &&
|
|
isa<CXXConstructorDecl>(S.CurContext)) {
|
|
// This is implicit default-initialization of a const member in
|
|
// a constructor. Complain that it needs to be explicitly
|
|
// initialized.
|
|
CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(S.CurContext);
|
|
S.Diag(Kind.getLocation(), diag::err_uninitialized_member_in_ctor)
|
|
<< (Constructor->getInheritedConstructor() ? 2 :
|
|
Constructor->isImplicit() ? 1 : 0)
|
|
<< S.Context.getTypeDeclType(Constructor->getParent())
|
|
<< /*const=*/1
|
|
<< Entity.getName();
|
|
S.Diag(Entity.getDecl()->getLocation(), diag::note_previous_decl)
|
|
<< Entity.getName();
|
|
} else {
|
|
S.Diag(Kind.getLocation(), diag::err_default_init_const)
|
|
<< DestType << (bool)DestType->getAs<RecordType>();
|
|
maybeEmitZeroInitializationFixit(S, *this, Entity);
|
|
}
|
|
break;
|
|
|
|
case FK_Incomplete:
|
|
S.RequireCompleteType(Kind.getLocation(), FailedIncompleteType,
|
|
diag::err_init_incomplete_type);
|
|
break;
|
|
|
|
case FK_ListInitializationFailed: {
|
|
// Run the init list checker again to emit diagnostics.
|
|
InitListExpr *InitList = cast<InitListExpr>(Args[0]);
|
|
diagnoseListInit(S, Entity, InitList);
|
|
break;
|
|
}
|
|
|
|
case FK_PlaceholderType: {
|
|
// FIXME: Already diagnosed!
|
|
break;
|
|
}
|
|
|
|
case FK_ExplicitConstructor: {
|
|
S.Diag(Kind.getLocation(), diag::err_selected_explicit_constructor)
|
|
<< Args[0]->getSourceRange();
|
|
OverloadCandidateSet::iterator Best;
|
|
OverloadingResult Ovl
|
|
= FailedCandidateSet.BestViableFunction(S, Kind.getLocation(), Best);
|
|
(void)Ovl;
|
|
assert(Ovl == OR_Success && "Inconsistent overload resolution");
|
|
CXXConstructorDecl *CtorDecl = cast<CXXConstructorDecl>(Best->Function);
|
|
S.Diag(CtorDecl->getLocation(), diag::note_constructor_declared_here);
|
|
break;
|
|
}
|
|
}
|
|
|
|
PrintInitLocationNote(S, Entity);
|
|
return true;
|
|
}
|
|
|
|
void InitializationSequence::dump(raw_ostream &OS) const {
|
|
switch (SequenceKind) {
|
|
case FailedSequence: {
|
|
OS << "Failed sequence: ";
|
|
switch (Failure) {
|
|
case FK_TooManyInitsForReference:
|
|
OS << "too many initializers for reference";
|
|
break;
|
|
|
|
case FK_ArrayNeedsInitList:
|
|
OS << "array requires initializer list";
|
|
break;
|
|
|
|
case FK_ArrayNeedsInitListOrStringLiteral:
|
|
OS << "array requires initializer list or string literal";
|
|
break;
|
|
|
|
case FK_ArrayNeedsInitListOrWideStringLiteral:
|
|
OS << "array requires initializer list or wide string literal";
|
|
break;
|
|
|
|
case FK_NarrowStringIntoWideCharArray:
|
|
OS << "narrow string into wide char array";
|
|
break;
|
|
|
|
case FK_WideStringIntoCharArray:
|
|
OS << "wide string into char array";
|
|
break;
|
|
|
|
case FK_IncompatWideStringIntoWideChar:
|
|
OS << "incompatible wide string into wide char array";
|
|
break;
|
|
|
|
case FK_ArrayTypeMismatch:
|
|
OS << "array type mismatch";
|
|
break;
|
|
|
|
case FK_NonConstantArrayInit:
|
|
OS << "non-constant array initializer";
|
|
break;
|
|
|
|
case FK_AddressOfOverloadFailed:
|
|
OS << "address of overloaded function failed";
|
|
break;
|
|
|
|
case FK_ReferenceInitOverloadFailed:
|
|
OS << "overload resolution for reference initialization failed";
|
|
break;
|
|
|
|
case FK_NonConstLValueReferenceBindingToTemporary:
|
|
OS << "non-const lvalue reference bound to temporary";
|
|
break;
|
|
|
|
case FK_NonConstLValueReferenceBindingToUnrelated:
|
|
OS << "non-const lvalue reference bound to unrelated type";
|
|
break;
|
|
|
|
case FK_RValueReferenceBindingToLValue:
|
|
OS << "rvalue reference bound to an lvalue";
|
|
break;
|
|
|
|
case FK_ReferenceInitDropsQualifiers:
|
|
OS << "reference initialization drops qualifiers";
|
|
break;
|
|
|
|
case FK_ReferenceInitFailed:
|
|
OS << "reference initialization failed";
|
|
break;
|
|
|
|
case FK_ConversionFailed:
|
|
OS << "conversion failed";
|
|
break;
|
|
|
|
case FK_ConversionFromPropertyFailed:
|
|
OS << "conversion from property failed";
|
|
break;
|
|
|
|
case FK_TooManyInitsForScalar:
|
|
OS << "too many initializers for scalar";
|
|
break;
|
|
|
|
case FK_ReferenceBindingToInitList:
|
|
OS << "referencing binding to initializer list";
|
|
break;
|
|
|
|
case FK_InitListBadDestinationType:
|
|
OS << "initializer list for non-aggregate, non-scalar type";
|
|
break;
|
|
|
|
case FK_UserConversionOverloadFailed:
|
|
OS << "overloading failed for user-defined conversion";
|
|
break;
|
|
|
|
case FK_ConstructorOverloadFailed:
|
|
OS << "constructor overloading failed";
|
|
break;
|
|
|
|
case FK_DefaultInitOfConst:
|
|
OS << "default initialization of a const variable";
|
|
break;
|
|
|
|
case FK_Incomplete:
|
|
OS << "initialization of incomplete type";
|
|
break;
|
|
|
|
case FK_ListInitializationFailed:
|
|
OS << "list initialization checker failure";
|
|
break;
|
|
|
|
case FK_VariableLengthArrayHasInitializer:
|
|
OS << "variable length array has an initializer";
|
|
break;
|
|
|
|
case FK_PlaceholderType:
|
|
OS << "initializer expression isn't contextually valid";
|
|
break;
|
|
|
|
case FK_ListConstructorOverloadFailed:
|
|
OS << "list constructor overloading failed";
|
|
break;
|
|
|
|
case FK_ExplicitConstructor:
|
|
OS << "list copy initialization chose explicit constructor";
|
|
break;
|
|
}
|
|
OS << '\n';
|
|
return;
|
|
}
|
|
|
|
case DependentSequence:
|
|
OS << "Dependent sequence\n";
|
|
return;
|
|
|
|
case NormalSequence:
|
|
OS << "Normal sequence: ";
|
|
break;
|
|
}
|
|
|
|
for (step_iterator S = step_begin(), SEnd = step_end(); S != SEnd; ++S) {
|
|
if (S != step_begin()) {
|
|
OS << " -> ";
|
|
}
|
|
|
|
switch (S->Kind) {
|
|
case SK_ResolveAddressOfOverloadedFunction:
|
|
OS << "resolve address of overloaded function";
|
|
break;
|
|
|
|
case SK_CastDerivedToBaseRValue:
|
|
OS << "derived-to-base case (rvalue" << S->Type.getAsString() << ")";
|
|
break;
|
|
|
|
case SK_CastDerivedToBaseXValue:
|
|
OS << "derived-to-base case (xvalue" << S->Type.getAsString() << ")";
|
|
break;
|
|
|
|
case SK_CastDerivedToBaseLValue:
|
|
OS << "derived-to-base case (lvalue" << S->Type.getAsString() << ")";
|
|
break;
|
|
|
|
case SK_BindReference:
|
|
OS << "bind reference to lvalue";
|
|
break;
|
|
|
|
case SK_BindReferenceToTemporary:
|
|
OS << "bind reference to a temporary";
|
|
break;
|
|
|
|
case SK_ExtraneousCopyToTemporary:
|
|
OS << "extraneous C++03 copy to temporary";
|
|
break;
|
|
|
|
case SK_UserConversion:
|
|
OS << "user-defined conversion via " << *S->Function.Function;
|
|
break;
|
|
|
|
case SK_QualificationConversionRValue:
|
|
OS << "qualification conversion (rvalue)";
|
|
break;
|
|
|
|
case SK_QualificationConversionXValue:
|
|
OS << "qualification conversion (xvalue)";
|
|
break;
|
|
|
|
case SK_QualificationConversionLValue:
|
|
OS << "qualification conversion (lvalue)";
|
|
break;
|
|
|
|
case SK_AtomicConversion:
|
|
OS << "non-atomic-to-atomic conversion";
|
|
break;
|
|
|
|
case SK_LValueToRValue:
|
|
OS << "load (lvalue to rvalue)";
|
|
break;
|
|
|
|
case SK_ConversionSequence:
|
|
OS << "implicit conversion sequence (";
|
|
S->ICS->dump(); // FIXME: use OS
|
|
OS << ")";
|
|
break;
|
|
|
|
case SK_ConversionSequenceNoNarrowing:
|
|
OS << "implicit conversion sequence with narrowing prohibited (";
|
|
S->ICS->dump(); // FIXME: use OS
|
|
OS << ")";
|
|
break;
|
|
|
|
case SK_ListInitialization:
|
|
OS << "list aggregate initialization";
|
|
break;
|
|
|
|
case SK_UnwrapInitList:
|
|
OS << "unwrap reference initializer list";
|
|
break;
|
|
|
|
case SK_RewrapInitList:
|
|
OS << "rewrap reference initializer list";
|
|
break;
|
|
|
|
case SK_ConstructorInitialization:
|
|
OS << "constructor initialization";
|
|
break;
|
|
|
|
case SK_ConstructorInitializationFromList:
|
|
OS << "list initialization via constructor";
|
|
break;
|
|
|
|
case SK_ZeroInitialization:
|
|
OS << "zero initialization";
|
|
break;
|
|
|
|
case SK_CAssignment:
|
|
OS << "C assignment";
|
|
break;
|
|
|
|
case SK_StringInit:
|
|
OS << "string initialization";
|
|
break;
|
|
|
|
case SK_ObjCObjectConversion:
|
|
OS << "Objective-C object conversion";
|
|
break;
|
|
|
|
case SK_ArrayInit:
|
|
OS << "array initialization";
|
|
break;
|
|
|
|
case SK_ParenthesizedArrayInit:
|
|
OS << "parenthesized array initialization";
|
|
break;
|
|
|
|
case SK_PassByIndirectCopyRestore:
|
|
OS << "pass by indirect copy and restore";
|
|
break;
|
|
|
|
case SK_PassByIndirectRestore:
|
|
OS << "pass by indirect restore";
|
|
break;
|
|
|
|
case SK_ProduceObjCObject:
|
|
OS << "Objective-C object retension";
|
|
break;
|
|
|
|
case SK_StdInitializerList:
|
|
OS << "std::initializer_list from initializer list";
|
|
break;
|
|
|
|
case SK_StdInitializerListConstructorCall:
|
|
OS << "list initialization from std::initializer_list";
|
|
break;
|
|
|
|
case SK_OCLSamplerInit:
|
|
OS << "OpenCL sampler_t from integer constant";
|
|
break;
|
|
|
|
case SK_OCLZeroEvent:
|
|
OS << "OpenCL event_t from zero";
|
|
break;
|
|
}
|
|
|
|
OS << " [" << S->Type.getAsString() << ']';
|
|
}
|
|
|
|
OS << '\n';
|
|
}
|
|
|
|
void InitializationSequence::dump() const {
|
|
dump(llvm::errs());
|
|
}
|
|
|
|
static void DiagnoseNarrowingInInitList(Sema &S,
|
|
const ImplicitConversionSequence &ICS,
|
|
QualType PreNarrowingType,
|
|
QualType EntityType,
|
|
const Expr *PostInit) {
|
|
const StandardConversionSequence *SCS = nullptr;
|
|
switch (ICS.getKind()) {
|
|
case ImplicitConversionSequence::StandardConversion:
|
|
SCS = &ICS.Standard;
|
|
break;
|
|
case ImplicitConversionSequence::UserDefinedConversion:
|
|
SCS = &ICS.UserDefined.After;
|
|
break;
|
|
case ImplicitConversionSequence::AmbiguousConversion:
|
|
case ImplicitConversionSequence::EllipsisConversion:
|
|
case ImplicitConversionSequence::BadConversion:
|
|
return;
|
|
}
|
|
|
|
// C++11 [dcl.init.list]p7: Check whether this is a narrowing conversion.
|
|
APValue ConstantValue;
|
|
QualType ConstantType;
|
|
switch (SCS->getNarrowingKind(S.Context, PostInit, ConstantValue,
|
|
ConstantType)) {
|
|
case NK_Not_Narrowing:
|
|
// No narrowing occurred.
|
|
return;
|
|
|
|
case NK_Type_Narrowing:
|
|
// This was a floating-to-integer conversion, which is always considered a
|
|
// narrowing conversion even if the value is a constant and can be
|
|
// represented exactly as an integer.
|
|
S.Diag(PostInit->getLocStart(),
|
|
(S.getLangOpts().MicrosoftExt || !S.getLangOpts().CPlusPlus11)
|
|
? diag::warn_init_list_type_narrowing
|
|
: diag::ext_init_list_type_narrowing)
|
|
<< PostInit->getSourceRange()
|
|
<< PreNarrowingType.getLocalUnqualifiedType()
|
|
<< EntityType.getLocalUnqualifiedType();
|
|
break;
|
|
|
|
case NK_Constant_Narrowing:
|
|
// A constant value was narrowed.
|
|
S.Diag(PostInit->getLocStart(),
|
|
(S.getLangOpts().MicrosoftExt || !S.getLangOpts().CPlusPlus11)
|
|
? diag::warn_init_list_constant_narrowing
|
|
: diag::ext_init_list_constant_narrowing)
|
|
<< PostInit->getSourceRange()
|
|
<< ConstantValue.getAsString(S.getASTContext(), ConstantType)
|
|
<< EntityType.getLocalUnqualifiedType();
|
|
break;
|
|
|
|
case NK_Variable_Narrowing:
|
|
// A variable's value may have been narrowed.
|
|
S.Diag(PostInit->getLocStart(),
|
|
(S.getLangOpts().MicrosoftExt || !S.getLangOpts().CPlusPlus11)
|
|
? diag::warn_init_list_variable_narrowing
|
|
: diag::ext_init_list_variable_narrowing)
|
|
<< PostInit->getSourceRange()
|
|
<< PreNarrowingType.getLocalUnqualifiedType()
|
|
<< EntityType.getLocalUnqualifiedType();
|
|
break;
|
|
}
|
|
|
|
SmallString<128> StaticCast;
|
|
llvm::raw_svector_ostream OS(StaticCast);
|
|
OS << "static_cast<";
|
|
if (const TypedefType *TT = EntityType->getAs<TypedefType>()) {
|
|
// It's important to use the typedef's name if there is one so that the
|
|
// fixit doesn't break code using types like int64_t.
|
|
//
|
|
// FIXME: This will break if the typedef requires qualification. But
|
|
// getQualifiedNameAsString() includes non-machine-parsable components.
|
|
OS << *TT->getDecl();
|
|
} else if (const BuiltinType *BT = EntityType->getAs<BuiltinType>())
|
|
OS << BT->getName(S.getLangOpts());
|
|
else {
|
|
// Oops, we didn't find the actual type of the variable. Don't emit a fixit
|
|
// with a broken cast.
|
|
return;
|
|
}
|
|
OS << ">(";
|
|
S.Diag(PostInit->getLocStart(), diag::note_init_list_narrowing_silence)
|
|
<< PostInit->getSourceRange()
|
|
<< FixItHint::CreateInsertion(PostInit->getLocStart(), OS.str())
|
|
<< FixItHint::CreateInsertion(
|
|
S.getLocForEndOfToken(PostInit->getLocEnd()), ")");
|
|
}
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// Initialization helper functions
|
|
//===----------------------------------------------------------------------===//
|
|
bool
|
|
Sema::CanPerformCopyInitialization(const InitializedEntity &Entity,
|
|
ExprResult Init) {
|
|
if (Init.isInvalid())
|
|
return false;
|
|
|
|
Expr *InitE = Init.get();
|
|
assert(InitE && "No initialization expression");
|
|
|
|
InitializationKind Kind
|
|
= InitializationKind::CreateCopy(InitE->getLocStart(), SourceLocation());
|
|
InitializationSequence Seq(*this, Entity, Kind, InitE);
|
|
return !Seq.Failed();
|
|
}
|
|
|
|
ExprResult
|
|
Sema::PerformCopyInitialization(const InitializedEntity &Entity,
|
|
SourceLocation EqualLoc,
|
|
ExprResult Init,
|
|
bool TopLevelOfInitList,
|
|
bool AllowExplicit) {
|
|
if (Init.isInvalid())
|
|
return ExprError();
|
|
|
|
Expr *InitE = Init.get();
|
|
assert(InitE && "No initialization expression?");
|
|
|
|
if (EqualLoc.isInvalid())
|
|
EqualLoc = InitE->getLocStart();
|
|
|
|
InitializationKind Kind = InitializationKind::CreateCopy(InitE->getLocStart(),
|
|
EqualLoc,
|
|
AllowExplicit);
|
|
InitializationSequence Seq(*this, Entity, Kind, InitE, TopLevelOfInitList);
|
|
Init.get();
|
|
|
|
ExprResult Result = Seq.Perform(*this, Entity, Kind, InitE);
|
|
|
|
return Result;
|
|
}
|