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f7ec86a55b
_Bool in C, if the macro is defined. Also teach FixItUtils to look at whether the macro was defined at the source location for which it is creating a fixit, rather than looking at whether it's defined *now*. This is especially relevant for analysis-based warnings which are delayed until end of TU. llvm-svn: 191057
226 lines
7.6 KiB
C++
226 lines
7.6 KiB
C++
//===--- SemaFixItUtils.cpp - Sema FixIts ---------------------------------===//
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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 defines helper classes for generation of Sema FixItHints.
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//
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//===----------------------------------------------------------------------===//
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#include "clang/AST/ASTContext.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/Lex/Preprocessor.h"
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#include "clang/Sema/Sema.h"
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#include "clang/Sema/SemaFixItUtils.h"
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using namespace clang;
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bool ConversionFixItGenerator::compareTypesSimple(CanQualType From,
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CanQualType To,
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Sema &S,
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SourceLocation Loc,
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ExprValueKind FromVK) {
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if (!To.isAtLeastAsQualifiedAs(From))
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return false;
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From = From.getNonReferenceType();
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To = To.getNonReferenceType();
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// If both are pointer types, work with the pointee types.
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if (isa<PointerType>(From) && isa<PointerType>(To)) {
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From = S.Context.getCanonicalType(
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(cast<PointerType>(From))->getPointeeType());
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To = S.Context.getCanonicalType(
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(cast<PointerType>(To))->getPointeeType());
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}
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const CanQualType FromUnq = From.getUnqualifiedType();
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const CanQualType ToUnq = To.getUnqualifiedType();
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if ((FromUnq == ToUnq || (S.IsDerivedFrom(FromUnq, ToUnq)) ) &&
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To.isAtLeastAsQualifiedAs(From))
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return true;
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return false;
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}
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bool ConversionFixItGenerator::tryToFixConversion(const Expr *FullExpr,
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const QualType FromTy,
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const QualType ToTy,
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Sema &S) {
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if (!FullExpr)
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return false;
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const CanQualType FromQTy = S.Context.getCanonicalType(FromTy);
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const CanQualType ToQTy = S.Context.getCanonicalType(ToTy);
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const SourceLocation Begin = FullExpr->getSourceRange().getBegin();
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const SourceLocation End = S.PP.getLocForEndOfToken(FullExpr->getSourceRange()
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.getEnd());
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// Strip the implicit casts - those are implied by the compiler, not the
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// original source code.
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const Expr* Expr = FullExpr->IgnoreImpCasts();
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bool NeedParen = true;
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if (isa<ArraySubscriptExpr>(Expr) ||
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isa<CallExpr>(Expr) ||
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isa<DeclRefExpr>(Expr) ||
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isa<CastExpr>(Expr) ||
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isa<CXXNewExpr>(Expr) ||
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isa<CXXConstructExpr>(Expr) ||
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isa<CXXDeleteExpr>(Expr) ||
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isa<CXXNoexceptExpr>(Expr) ||
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isa<CXXPseudoDestructorExpr>(Expr) ||
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isa<CXXScalarValueInitExpr>(Expr) ||
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isa<CXXThisExpr>(Expr) ||
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isa<CXXTypeidExpr>(Expr) ||
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isa<CXXUnresolvedConstructExpr>(Expr) ||
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isa<ObjCMessageExpr>(Expr) ||
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isa<ObjCPropertyRefExpr>(Expr) ||
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isa<ObjCProtocolExpr>(Expr) ||
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isa<MemberExpr>(Expr) ||
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isa<ParenExpr>(FullExpr) ||
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isa<ParenListExpr>(Expr) ||
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isa<SizeOfPackExpr>(Expr) ||
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isa<UnaryOperator>(Expr))
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NeedParen = false;
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// Check if the argument needs to be dereferenced:
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// (type * -> type) or (type * -> type &).
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if (const PointerType *FromPtrTy = dyn_cast<PointerType>(FromQTy)) {
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OverloadFixItKind FixKind = OFIK_Dereference;
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bool CanConvert = CompareTypes(
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S.Context.getCanonicalType(FromPtrTy->getPointeeType()), ToQTy,
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S, Begin, VK_LValue);
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if (CanConvert) {
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// Do not suggest dereferencing a Null pointer.
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if (Expr->IgnoreParenCasts()->
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isNullPointerConstant(S.Context, Expr::NPC_ValueDependentIsNotNull))
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return false;
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if (const UnaryOperator *UO = dyn_cast<UnaryOperator>(Expr)) {
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if (UO->getOpcode() == UO_AddrOf) {
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FixKind = OFIK_RemoveTakeAddress;
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Hints.push_back(FixItHint::CreateRemoval(
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CharSourceRange::getTokenRange(Begin, Begin)));
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}
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} else if (NeedParen) {
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Hints.push_back(FixItHint::CreateInsertion(Begin, "*("));
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Hints.push_back(FixItHint::CreateInsertion(End, ")"));
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} else {
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Hints.push_back(FixItHint::CreateInsertion(Begin, "*"));
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}
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NumConversionsFixed++;
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if (NumConversionsFixed == 1)
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Kind = FixKind;
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return true;
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}
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}
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// Check if the pointer to the argument needs to be passed:
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// (type -> type *) or (type & -> type *).
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if (isa<PointerType>(ToQTy)) {
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bool CanConvert = false;
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OverloadFixItKind FixKind = OFIK_TakeAddress;
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// Only suggest taking address of L-values.
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if (!Expr->isLValue() || Expr->getObjectKind() != OK_Ordinary)
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return false;
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CanConvert = CompareTypes(S.Context.getPointerType(FromQTy), ToQTy,
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S, Begin, VK_RValue);
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if (CanConvert) {
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if (const UnaryOperator *UO = dyn_cast<UnaryOperator>(Expr)) {
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if (UO->getOpcode() == UO_Deref) {
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FixKind = OFIK_RemoveDereference;
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Hints.push_back(FixItHint::CreateRemoval(
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CharSourceRange::getTokenRange(Begin, Begin)));
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}
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} else if (NeedParen) {
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Hints.push_back(FixItHint::CreateInsertion(Begin, "&("));
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Hints.push_back(FixItHint::CreateInsertion(End, ")"));
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} else {
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Hints.push_back(FixItHint::CreateInsertion(Begin, "&"));
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}
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NumConversionsFixed++;
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if (NumConversionsFixed == 1)
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Kind = FixKind;
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return true;
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}
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}
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return false;
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}
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static bool isMacroDefined(const Sema &S, SourceLocation Loc, StringRef Name) {
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const IdentifierInfo *II = &S.getASTContext().Idents.get(Name);
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if (!II->hadMacroDefinition()) return false;
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MacroDirective *Macro = S.PP.getMacroDirectiveHistory(II);
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return Macro && Macro->findDirectiveAtLoc(Loc, S.getSourceManager());
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}
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static std::string getScalarZeroExpressionForType(
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const Type &T, SourceLocation Loc, const Sema &S) {
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assert(T.isScalarType() && "use scalar types only");
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// Suggest "0" for non-enumeration scalar types, unless we can find a
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// better initializer.
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if (T.isEnumeralType())
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return std::string();
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if ((T.isObjCObjectPointerType() || T.isBlockPointerType()) &&
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isMacroDefined(S, Loc, "nil"))
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return "nil";
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if (T.isRealFloatingType())
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return "0.0";
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if (T.isBooleanType() &&
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(S.LangOpts.CPlusPlus || isMacroDefined(S, Loc, "false")))
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return "false";
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if (T.isPointerType() || T.isMemberPointerType()) {
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if (S.LangOpts.CPlusPlus11)
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return "nullptr";
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if (isMacroDefined(S, Loc, "NULL"))
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return "NULL";
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}
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if (T.isCharType())
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return "'\\0'";
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if (T.isWideCharType())
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return "L'\\0'";
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if (T.isChar16Type())
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return "u'\\0'";
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if (T.isChar32Type())
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return "U'\\0'";
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return "0";
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}
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std::string
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Sema::getFixItZeroInitializerForType(QualType T, SourceLocation Loc) const {
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if (T->isScalarType()) {
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std::string s = getScalarZeroExpressionForType(*T, Loc, *this);
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if (!s.empty())
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s = " = " + s;
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return s;
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}
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const CXXRecordDecl *RD = T->getAsCXXRecordDecl();
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if (!RD || !RD->hasDefinition())
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return std::string();
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if (LangOpts.CPlusPlus11 && !RD->hasUserProvidedDefaultConstructor())
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return "{}";
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if (RD->isAggregate())
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return " = {}";
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return std::string();
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}
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std::string
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Sema::getFixItZeroLiteralForType(QualType T, SourceLocation Loc) const {
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return getScalarZeroExpressionForType(*T, Loc, *this);
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}
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