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Move named cast helpers out of Sema, as Chris requested. This requirse making a few functions public that weren't before.

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llvm-svn: 58906
This commit is contained in:
Sebastian Redl 2008-11-08 13:00:26 +00:00
parent 09991ada2d
commit 842ef52ff3
2 changed files with 148 additions and 141 deletions
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40
clang/lib/Sema/Sema.h
View File

@ -266,7 +266,7 @@ public:
bool UnwrapSimilarPointerTypes(QualType& T1, QualType& T2);
virtual TypeResult ActOnTypeName(Scope *S, Declarator &D);
private:
//===--------------------------------------------------------------------===//
// Symbol table / Decl tracking callbacks: SemaDecl.cpp.
//
@ -329,7 +329,7 @@ private:
SourceLocation EqualLoc, ExprTy *Val);
virtual void ActOnEnumBody(SourceLocation EnumLoc, DeclTy *EnumDecl,
DeclTy **Elements, unsigned NumElements);
private:
DeclContext *getDCParent(DeclContext *DC);
/// Set the current declaration context until it gets popped.
@ -738,41 +738,6 @@ public:
SourceLocation LParenLoc, ExprTy *E,
SourceLocation RParenLoc);
private:
// Helpers for ActOnCXXCasts
void CheckConstCast(Expr *&SrcExpr, QualType DestType,
const SourceRange &OpRange, const SourceRange &DestRange);
void CheckReinterpretCast(Expr *&SrcExpr, QualType DestType,
const SourceRange &OpRange,
const SourceRange &DestRange);
void CheckStaticCast(Expr *&SrcExpr, QualType DestType,
const SourceRange &OpRange);
void CheckDynamicCast(Expr *&SrcExpr, QualType DestType,
const SourceRange &OpRange,
const SourceRange &DestRange);
enum TryStaticCastResult {
TSC_NotApplicable, ///< The cast method is not applicable.
TSC_Success, ///< The cast method is appropriate and successful.
TSC_Failed ///< The cast method is appropriate, but failed. A
///< diagnostic has been emitted.
};
bool CastsAwayConstness(QualType SrcType, QualType DestType);
TryStaticCastResult TryStaticReferenceDowncast(Expr *SrcExpr,
QualType DestType,
const SourceRange &OpRange);
TryStaticCastResult TryStaticPointerDowncast(QualType SrcType,
QualType DestType,
const SourceRange &OpRange);
TryStaticCastResult TryStaticDowncast(QualType SrcType, QualType DestType,
const SourceRange &OpRange,
QualType OrigSrcType,
QualType OrigDestType);
TryStaticCastResult TryStaticImplicitCast(Expr *SrcExpr, QualType DestType,
const SourceRange &OpRange);
public:
//// ActOnCXXThis - Parse 'this' pointer.
virtual ExprResult ActOnCXXThis(SourceLocation ThisLoc);
@ -1022,7 +987,6 @@ public:
SourceLocation LParenLoc,
SourceLocation RParenLoc);
private:
/// ImpCastExprToType - If Expr is not of type 'Type', insert an implicit
/// cast. If there is already an implicit cast, merge into the existing one.
void ImpCastExprToType(Expr *&Expr, QualType Type);

249
clang/lib/Sema/SemaNamedCast.cpp
View File

@ -20,6 +20,39 @@
#include <set>
using namespace clang;
enum TryStaticCastResult {
TSC_NotApplicable, ///< The cast method is not applicable.
TSC_Success, ///< The cast method is appropriate and successful.
TSC_Failed ///< The cast method is appropriate, but failed. A
///< diagnostic has been emitted.
};
static void CheckConstCast(Sema &Self, Expr *&SrcExpr, QualType DestType,
const SourceRange &OpRange,
const SourceRange &DestRange);
static void CheckReinterpretCast(Sema &Self, Expr *&SrcExpr, QualType DestType,
const SourceRange &OpRange,
const SourceRange &DestRange);
static void CheckStaticCast(Sema &Self, Expr *&SrcExpr, QualType DestType,
const SourceRange &OpRange);
static void CheckDynamicCast(Sema &Self, Expr *&SrcExpr, QualType DestType,
const SourceRange &OpRange,
const SourceRange &DestRange);
static bool CastsAwayConstness(Sema &Self, QualType SrcType, QualType DestType);
static TryStaticCastResult TryStaticReferenceDowncast(
Sema &Self, Expr *SrcExpr, QualType DestType, const SourceRange &OpRange);
static TryStaticCastResult TryStaticPointerDowncast(
Sema &Self, QualType SrcType, QualType DestType, const SourceRange &OpRange);
static TryStaticCastResult TryStaticDowncast(Sema &Self, QualType SrcType,
QualType DestType,
const SourceRange &OpRange,
QualType OrigSrcType,
QualType OrigDestType);
static TryStaticCastResult TryStaticImplicitCast(Sema &Self, Expr *SrcExpr,
QualType DestType,
const SourceRange &OpRange);
/// ActOnCXXNamedCast - Parse {dynamic,static,reinterpret,const}_cast's.
Action::ExprResult
Sema::ActOnCXXNamedCast(SourceLocation OpLoc, tok::TokenKind Kind,
@ -36,22 +69,22 @@ Sema::ActOnCXXNamedCast(SourceLocation OpLoc, tok::TokenKind Kind,
default: assert(0 && "Unknown C++ cast!");
case tok::kw_const_cast:
CheckConstCast(Ex, DestType, OpRange, DestRange);
CheckConstCast(*this, Ex, DestType, OpRange, DestRange);
return new CXXConstCastExpr(DestType.getNonReferenceType(), Ex,
DestType, OpLoc);
case tok::kw_dynamic_cast:
CheckDynamicCast(Ex, DestType, OpRange, DestRange);
CheckDynamicCast(*this, Ex, DestType, OpRange, DestRange);
return new CXXDynamicCastExpr(DestType.getNonReferenceType(), Ex,
DestType, OpLoc);
case tok::kw_reinterpret_cast:
CheckReinterpretCast(Ex, DestType, OpRange, DestRange);
CheckReinterpretCast(*this, Ex, DestType, OpRange, DestRange);
return new CXXReinterpretCastExpr(DestType.getNonReferenceType(), Ex,
DestType, OpLoc);
case tok::kw_static_cast:
CheckStaticCast(Ex, DestType, OpRange);
CheckStaticCast(*this, Ex, DestType, OpRange);
return new CXXStaticCastExpr(DestType.getNonReferenceType(), Ex,
DestType, OpLoc);
}
@ -65,30 +98,30 @@ Sema::ActOnCXXNamedCast(SourceLocation OpLoc, tok::TokenKind Kind,
/// const char *str = "literal";
/// legacy_function(const_cast\<char*\>(str));
void
Sema::CheckConstCast(Expr *&SrcExpr, QualType DestType,
const SourceRange &OpRange, const SourceRange &DestRange)
CheckConstCast(Sema &Self, Expr *&SrcExpr, QualType DestType,
const SourceRange &OpRange, const SourceRange &DestRange)
{
QualType OrigDestType = DestType, OrigSrcType = SrcExpr->getType();
DestType = Context.getCanonicalType(DestType);
DestType = Self.Context.getCanonicalType(DestType);
QualType SrcType = SrcExpr->getType();
if (const ReferenceType *DestTypeTmp = DestType->getAsReferenceType()) {
if (SrcExpr->isLvalue(Context) != Expr::LV_Valid) {
if (SrcExpr->isLvalue(Self.Context) != Expr::LV_Valid) {
// Cannot cast non-lvalue to reference type.
Diag(OpRange.getBegin(), diag::err_bad_cxx_cast_rvalue,
Self.Diag(OpRange.getBegin(), diag::err_bad_cxx_cast_rvalue,
"const_cast", OrigDestType.getAsString(), SrcExpr->getSourceRange());
return;
}
// C++ 5.2.11p4: An lvalue of type T1 can be [cast] to an lvalue of type T2
// [...] if a pointer to T1 can be [cast] to the type pointer to T2.
DestType = Context.getPointerType(DestTypeTmp->getPointeeType());
SrcType = Context.getPointerType(SrcType);
DestType = Self.Context.getPointerType(DestTypeTmp->getPointeeType());
SrcType = Self.Context.getPointerType(SrcType);
} else {
// C++ 5.2.11p1: Otherwise, the result is an rvalue and the
// lvalue-to-rvalue, array-to-pointer, and function-to-pointer standard
// conversions are performed on the expression.
DefaultFunctionArrayConversion(SrcExpr);
Self.DefaultFunctionArrayConversion(SrcExpr);
SrcType = SrcExpr->getType();
}
@ -96,7 +129,7 @@ Sema::CheckConstCast(Expr *&SrcExpr, QualType DestType,
// Cannot cast to non-pointer, non-reference type. Note that, if DestType
// was a reference type, we converted it to a pointer above.
// C++ 5.2.11p3: For two pointer types [...]
Diag(OpRange.getBegin(), diag::err_bad_const_cast_dest,
Self.Diag(OpRange.getBegin(), diag::err_bad_const_cast_dest,
OrigDestType.getAsString(), DestRange);
return;
}
@ -104,11 +137,11 @@ Sema::CheckConstCast(Expr *&SrcExpr, QualType DestType,
// Cannot cast direct function pointers.
// C++ 5.2.11p2: [...] where T is any object type or the void type [...]
// T is the ultimate pointee of source and target type.
Diag(OpRange.getBegin(), diag::err_bad_const_cast_dest,
Self.Diag(OpRange.getBegin(), diag::err_bad_const_cast_dest,
OrigDestType.getAsString(), DestRange);
return;
}
SrcType = Context.getCanonicalType(SrcType);
SrcType = Self.Context.getCanonicalType(SrcType);
// Unwrap the pointers. Ignore qualifiers. Terminate early if the types are
// completely equal.
@ -117,7 +150,8 @@ Sema::CheckConstCast(Expr *&SrcExpr, QualType DestType,
// C++ 5.2.11p3 describes the core semantics of const_cast. All cv specifiers
// in multi-level pointers may change, but the level count must be the same,
// as must be the final pointee type.
while (SrcType != DestType && UnwrapSimilarPointerTypes(SrcType, DestType)) {
while (SrcType != DestType &&
Self.UnwrapSimilarPointerTypes(SrcType, DestType)) {
SrcType = SrcType.getUnqualifiedType();
DestType = DestType.getUnqualifiedType();
}
@ -130,13 +164,14 @@ Sema::CheckConstCast(Expr *&SrcExpr, QualType DestType,
// No more than one level, though, so don't embed this in the unwrap loop
// above.
const ConstantArrayType *SrcTypeArr, *DestTypeArr;
if ((SrcTypeArr = Context.getAsConstantArrayType(SrcType)) &&
(DestTypeArr = Context.getAsConstantArrayType(DestType)))
if ((SrcTypeArr = Self.Context.getAsConstantArrayType(SrcType)) &&
(DestTypeArr = Self.Context.getAsConstantArrayType(DestType)))
{
if (SrcTypeArr->getSize() != DestTypeArr->getSize()) {
// Different array sizes.
Diag(OpRange.getBegin(), diag::err_bad_cxx_cast_generic, "const_cast",
OrigDestType.getAsString(), OrigSrcType.getAsString(), OpRange);
Self.Diag(OpRange.getBegin(), diag::err_bad_cxx_cast_generic,
"const_cast", OrigDestType.getAsString(), OrigSrcType.getAsString(),
OpRange);
return;
}
SrcType = SrcTypeArr->getElementType().getUnqualifiedType();
@ -147,7 +182,7 @@ Sema::CheckConstCast(Expr *&SrcExpr, QualType DestType,
// Since we're dealing in canonical types, the remainder must be the same.
if (SrcType != DestType) {
// Cast between unrelated types.
Diag(OpRange.getBegin(), diag::err_bad_cxx_cast_generic, "const_cast",
Self.Diag(OpRange.getBegin(), diag::err_bad_cxx_cast_generic, "const_cast",
OrigDestType.getAsString(), OrigSrcType.getAsString(), OpRange);
return;
}
@ -159,18 +194,17 @@ Sema::CheckConstCast(Expr *&SrcExpr, QualType DestType,
/// like this:
/// char *bytes = reinterpret_cast\<char*\>(int_ptr);
void
Sema::CheckReinterpretCast(Expr *&SrcExpr, QualType DestType,
const SourceRange &OpRange,
const SourceRange &DestRange)
CheckReinterpretCast(Sema &Self, Expr *&SrcExpr, QualType DestType,
const SourceRange &OpRange, const SourceRange &DestRange)
{
QualType OrigDestType = DestType, OrigSrcType = SrcExpr->getType();
DestType = Context.getCanonicalType(DestType);
DestType = Self.Context.getCanonicalType(DestType);
QualType SrcType = SrcExpr->getType();
if (const ReferenceType *DestTypeTmp = DestType->getAsReferenceType()) {
if (SrcExpr->isLvalue(Context) != Expr::LV_Valid) {
if (SrcExpr->isLvalue(Self.Context) != Expr::LV_Valid) {
// Cannot cast non-lvalue to reference type.
Diag(OpRange.getBegin(), diag::err_bad_cxx_cast_rvalue,
Self.Diag(OpRange.getBegin(), diag::err_bad_cxx_cast_rvalue,
"reinterpret_cast", OrigDestType.getAsString(),
SrcExpr->getSourceRange());
return;
@ -180,18 +214,18 @@ Sema::CheckReinterpretCast(Expr *&SrcExpr, QualType DestType,
// same effect as the conversion *reinterpret_cast<T*>(&x) with the
// built-in & and * operators.
// This code does this transformation for the checked types.
DestType = Context.getPointerType(DestTypeTmp->getPointeeType());
SrcType = Context.getPointerType(SrcType);
DestType = Self.Context.getPointerType(DestTypeTmp->getPointeeType());
SrcType = Self.Context.getPointerType(SrcType);
} else {
// C++ 5.2.10p1: [...] the lvalue-to-rvalue, array-to-pointer, and
// function-to-pointer standard conversions are performed on the
// expression v.
DefaultFunctionArrayConversion(SrcExpr);
Self.DefaultFunctionArrayConversion(SrcExpr);
SrcType = SrcExpr->getType();
}
// Canonicalize source for comparison.
SrcType = Context.getCanonicalType(SrcType);
SrcType = Self.Context.getCanonicalType(SrcType);
bool destIsPtr = DestType->isPointerType();
bool srcIsPtr = SrcType->isPointerType();
@ -199,8 +233,9 @@ Sema::CheckReinterpretCast(Expr *&SrcExpr, QualType DestType,
// Except for std::nullptr_t->integer, which is not supported yet, and
// lvalue->reference, which is handled above, at least one of the two
// arguments must be a pointer.
Diag(OpRange.getBegin(), diag::err_bad_cxx_cast_generic, "reinterpret_cast",
OrigDestType.getAsString(), OrigSrcType.getAsString(), OpRange);
Self.Diag(OpRange.getBegin(), diag::err_bad_cxx_cast_generic,
"reinterpret_cast", OrigDestType.getAsString(), OrigSrcType.getAsString(),
OpRange);
return;
}
@ -220,8 +255,9 @@ Sema::CheckReinterpretCast(Expr *&SrcExpr, QualType DestType,
assert(srcIsPtr && "One type must be a pointer");
// C++ 5.2.10p4: A pointer can be explicitly converted to any integral
// type large enough to hold it.
if (Context.getTypeSize(SrcType) > Context.getTypeSize(DestType)) {
Diag(OpRange.getBegin(), diag::err_bad_reinterpret_cast_small_int,
if (Self.Context.getTypeSize(SrcType) >
Self.Context.getTypeSize(DestType)) {
Self.Diag(OpRange.getBegin(), diag::err_bad_reinterpret_cast_small_int,
OrigDestType.getAsString(), DestRange);
}
return;
@ -237,14 +273,15 @@ Sema::CheckReinterpretCast(Expr *&SrcExpr, QualType DestType,
if (!destIsPtr || !srcIsPtr) {
// With the valid non-pointer conversions out of the way, we can be even
// more stringent.
Diag(OpRange.getBegin(), diag::err_bad_cxx_cast_generic, "reinterpret_cast",
OrigDestType.getAsString(), OrigSrcType.getAsString(), OpRange);
Self.Diag(OpRange.getBegin(), diag::err_bad_cxx_cast_generic,
"reinterpret_cast", OrigDestType.getAsString(), OrigSrcType.getAsString(),
OpRange);
return;
}
// C++ 5.2.10p2: The reinterpret_cast operator shall not cast away constness.
if (CastsAwayConstness(SrcType, DestType)) {
Diag(OpRange.getBegin(), diag::err_bad_cxx_cast_const_away,
if (CastsAwayConstness(Self, SrcType, DestType)) {
Self.Diag(OpRange.getBegin(), diag::err_bad_cxx_cast_const_away,
"reinterpret_cast", OrigDestType.getAsString(), OrigSrcType.getAsString(),
OpRange);
return;
@ -268,8 +305,8 @@ Sema::CheckReinterpretCast(Expr *&SrcExpr, QualType DestType,
// casting the return value of dlsym() and GetProcAddress().
// FIXME: Conditionally-supported behavior should be configurable in the
// TargetInfo or similar.
if (!getLangOptions().CPlusPlus0x) {
Diag(OpRange.getBegin(), diag::ext_reinterpret_cast_fn_obj, OpRange);
if (!Self.getLangOptions().CPlusPlus0x) {
Self.Diag(OpRange.getBegin(), diag::ext_reinterpret_cast_fn_obj, OpRange);
}
return;
}
@ -278,8 +315,8 @@ Sema::CheckReinterpretCast(Expr *&SrcExpr, QualType DestType,
if (DestType->isFunctionPointerType()) {
// See above.
if (!getLangOptions().CPlusPlus0x) {
Diag(OpRange.getBegin(), diag::ext_reinterpret_cast_fn_obj, OpRange);
if (!Self.getLangOptions().CPlusPlus0x) {
Self.Diag(OpRange.getBegin(), diag::ext_reinterpret_cast_fn_obj, OpRange);
}
return;
}
@ -296,7 +333,7 @@ Sema::CheckReinterpretCast(Expr *&SrcExpr, QualType DestType,
/// 5.2.11p8ff. This is used by the cast checkers. Both arguments
/// must denote pointer types.
bool
Sema::CastsAwayConstness(QualType SrcType, QualType DestType)
CastsAwayConstness(Sema &Self, QualType SrcType, QualType DestType)
{
// Casting away constness is defined in C++ 5.2.11p8 with reference to
// C++ 4.4.
@ -308,7 +345,7 @@ Sema::CastsAwayConstness(QualType SrcType, QualType DestType)
llvm::SmallVector<unsigned, 8> cv1, cv2;
// Find the qualifications.
while (UnwrapSimilarPointerTypes(UnwrappedSrcType, UnwrappedDestType)) {
while (Self.UnwrapSimilarPointerTypes(UnwrappedSrcType, UnwrappedDestType)) {
cv1.push_back(UnwrappedSrcType.getCVRQualifiers());
cv2.push_back(UnwrappedDestType.getCVRQualifiers());
}
@ -316,27 +353,29 @@ Sema::CastsAwayConstness(QualType SrcType, QualType DestType)
// Construct void pointers with those qualifiers (in reverse order of
// unwrapping, of course).
QualType SrcConstruct = Context.VoidTy;
QualType DestConstruct = Context.VoidTy;
QualType SrcConstruct = Self.Context.VoidTy;
QualType DestConstruct = Self.Context.VoidTy;
for (llvm::SmallVector<unsigned, 8>::reverse_iterator i1 = cv1.rbegin(),
i2 = cv2.rbegin();
i1 != cv1.rend(); ++i1, ++i2)
{
SrcConstruct = Context.getPointerType(SrcConstruct.getQualifiedType(*i1));
DestConstruct = Context.getPointerType(DestConstruct.getQualifiedType(*i2));
SrcConstruct = Self.Context.getPointerType(
SrcConstruct.getQualifiedType(*i1));
DestConstruct = Self.Context.getPointerType(
DestConstruct.getQualifiedType(*i2));
}
// Test if they're compatible.
return SrcConstruct != DestConstruct &&
!IsQualificationConversion(SrcConstruct, DestConstruct);
!Self.IsQualificationConversion(SrcConstruct, DestConstruct);
}
/// CheckStaticCast - Check that a static_cast\<DestType\>(SrcExpr) is valid.
/// Refer to C++ 5.2.9 for details. Static casts are mostly used for making
/// implicit conversions explicit and getting rid of data loss warnings.
void
Sema::CheckStaticCast(Expr *&SrcExpr, QualType DestType,
const SourceRange &OpRange)
CheckStaticCast(Sema &Self, Expr *&SrcExpr, QualType DestType,
const SourceRange &OpRange)
{
// The order the tests is not entirely arbitrary. There is one conversion
// that can be handled in two different ways. Given:
@ -358,14 +397,15 @@ Sema::CheckStaticCast(Expr *&SrcExpr, QualType DestType,
// C++ 5.2.9p5, reference downcast.
// See the function for details.
// DR 427 specifies that this is to be applied before paragraph 2.
if (TryStaticReferenceDowncast(SrcExpr, DestType, OpRange)
if (TryStaticReferenceDowncast(Self, SrcExpr, DestType, OpRange)
> TSC_NotApplicable) {
return;
}
// C++ 5.2.9p2: An expression e can be explicitly converted to a type T
// [...] if the declaration "T t(e);" is well-formed, [...].
if (TryStaticImplicitCast(SrcExpr, DestType, OpRange) > TSC_NotApplicable) {
if (TryStaticImplicitCast(Self, SrcExpr, DestType, OpRange) >
TSC_NotApplicable) {
return;
}
@ -378,9 +418,9 @@ Sema::CheckStaticCast(Expr *&SrcExpr, QualType DestType,
// The lvalue-to-rvalue, array-to-pointer and function-to-pointer conversions
// are applied to the expression.
QualType OrigSrcType = SrcExpr->getType();
DefaultFunctionArrayConversion(SrcExpr);
Self.DefaultFunctionArrayConversion(SrcExpr);
QualType SrcType = Context.getCanonicalType(SrcExpr->getType());
QualType SrcType = Self.Context.getCanonicalType(SrcExpr->getType());
// Reverse integral promotion/conversion. All such conversions are themselves
// again integral promotions or conversions and are thus already handled by
@ -400,7 +440,7 @@ Sema::CheckStaticCast(Expr *&SrcExpr, QualType DestType,
// Reverse pointer upcast. C++ 4.10p3 specifies pointer upcast.
// C++ 5.2.9p8 additionally disallows a cast path through virtual inheritance.
if (TryStaticPointerDowncast(SrcType, DestType, OpRange)
if (TryStaticPointerDowncast(Self, SrcType, DestType, OpRange)
> TSC_NotApplicable) {
return;
}
@ -422,7 +462,7 @@ Sema::CheckStaticCast(Expr *&SrcExpr, QualType DestType,
// This is definitely the intended conversion, but it might fail due
// to a const violation.
if (!DestPointee.isAtLeastAsQualifiedAs(SrcPointee)) {
Diag(OpRange.getBegin(), diag::err_bad_cxx_cast_const_away,
Self.Diag(OpRange.getBegin(), diag::err_bad_cxx_cast_const_away,
"static_cast", DestType.getAsString(),
OrigSrcType.getAsString(), OpRange);
}
@ -436,14 +476,14 @@ Sema::CheckStaticCast(Expr *&SrcExpr, QualType DestType,
// FIXME: Error reporting could be a lot better. Should store the reason
// why every substep failed and, at the end, select the most specific and
// report that.
Diag(OpRange.getBegin(), diag::err_bad_cxx_cast_generic, "static_cast",
Self.Diag(OpRange.getBegin(), diag::err_bad_cxx_cast_generic, "static_cast",
DestType.getAsString(), OrigSrcType.getAsString(), OpRange);
}
/// Tests whether a conversion according to C++ 5.2.9p5 is valid.
Sema::TryStaticCastResult
Sema::TryStaticReferenceDowncast(Expr *SrcExpr, QualType DestType,
const SourceRange &OpRange)
TryStaticCastResult
TryStaticReferenceDowncast(Sema &Self, Expr *SrcExpr, QualType DestType,
const SourceRange &OpRange)
{
// C++ 5.2.9p5: An lvalue of type "cv1 B", where B is a class type, can be
// cast to type "reference to cv2 D", where D is a class derived from B,
@ -454,7 +494,7 @@ Sema::TryStaticReferenceDowncast(Expr *SrcExpr, QualType DestType,
// variant of this rule, the intent is clearly for it to apply to the this
// conversion as well.
if (SrcExpr->isLvalue(Context) != Expr::LV_Valid) {
if (SrcExpr->isLvalue(Self.Context) != Expr::LV_Valid) {
return TSC_NotApplicable;
}
@ -464,14 +504,14 @@ Sema::TryStaticReferenceDowncast(Expr *SrcExpr, QualType DestType,
}
QualType DestPointee = DestReference->getPointeeType();
return TryStaticDowncast(SrcExpr->getType(), DestPointee, OpRange,
return TryStaticDowncast(Self, SrcExpr->getType(), DestPointee, OpRange,
SrcExpr->getType(), DestType);
}
/// Tests whether a conversion according to C++ 5.2.9p8 is valid.
Sema::TryStaticCastResult
Sema::TryStaticPointerDowncast(QualType SrcType, QualType DestType,
const SourceRange &OpRange)
TryStaticCastResult
TryStaticPointerDowncast(Sema &Self, QualType SrcType, QualType DestType,
const SourceRange &OpRange)
{
// C++ 5.2.9p8: An rvalue of type "pointer to cv1 B", where B is a class
// type, can be converted to an rvalue of type "pointer to cv2 D", where D
@ -491,7 +531,7 @@ Sema::TryStaticPointerDowncast(QualType SrcType, QualType DestType,
return TSC_NotApplicable;
}
return TryStaticDowncast(SrcPointer->getPointeeType(),
return TryStaticDowncast(Self, SrcPointer->getPointeeType(),
DestPointer->getPointeeType(),
OpRange, SrcType, DestType);
}
@ -499,10 +539,10 @@ Sema::TryStaticPointerDowncast(QualType SrcType, QualType DestType,
/// TryStaticDowncast - Common functionality of TryStaticReferenceDowncast and
/// TryStaticPointerDowncast. Tests whether a static downcast from SrcType to
/// DestType, both of which must be canonical, is possible and allowed.
Sema::TryStaticCastResult
Sema::TryStaticDowncast(QualType SrcType, QualType DestType,
const SourceRange &OpRange, QualType OrigSrcType,
QualType OrigDestType)
TryStaticCastResult
TryStaticDowncast(Sema &Self, QualType SrcType, QualType DestType,
const SourceRange &OpRange, QualType OrigSrcType,
QualType OrigDestType)
{
// Downcast can only happen in class hierarchies, so we need classes.
if (!DestType->isRecordType() || !SrcType->isRecordType()) {
@ -511,7 +551,7 @@ Sema::TryStaticDowncast(QualType SrcType, QualType DestType,
BasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/false,
/*DetectVirtual=*/true);
if (!IsDerivedFrom(DestType, SrcType, Paths)) {
if (!Self.IsDerivedFrom(DestType, SrcType, Paths)) {
return TSC_NotApplicable;
}
@ -535,7 +575,7 @@ Sema::TryStaticDowncast(QualType SrcType, QualType DestType,
// Must preserve cv, as always.
if (!DestType.isAtLeastAsQualifiedAs(SrcType)) {
Diag(OpRange.getBegin(), diag::err_bad_cxx_cast_const_away,
Self.Diag(OpRange.getBegin(), diag::err_bad_cxx_cast_const_away,
"static_cast", OrigDestType.getAsString(), OrigSrcType.getAsString(),
OpRange);
return TSC_Failed;
@ -548,7 +588,7 @@ Sema::TryStaticDowncast(QualType SrcType, QualType DestType,
// them. Use it to spice up the error message.
Paths.clear();
Paths.setRecordingPaths(true);
IsDerivedFrom(DestType, SrcType, Paths);
Self.IsDerivedFrom(DestType, SrcType, Paths);
std::string PathDisplayStr;
std::set<unsigned> DisplayedPaths;
for (BasePaths::paths_iterator Path = Paths.begin();
@ -564,7 +604,7 @@ Sema::TryStaticDowncast(QualType SrcType, QualType DestType,
}
}
Diag(OpRange.getBegin(), diag::err_ambiguous_base_to_derived_cast,
Self.Diag(OpRange.getBegin(), diag::err_ambiguous_base_to_derived_cast,
SrcType.getUnqualifiedType().getAsString(),
DestType.getUnqualifiedType().getAsString(),
PathDisplayStr, OpRange);
@ -573,7 +613,7 @@ Sema::TryStaticDowncast(QualType SrcType, QualType DestType,
if (Paths.getDetectedVirtual() != 0) {
QualType VirtualBase(Paths.getDetectedVirtual(), 0);
Diag(OpRange.getBegin(), diag::err_static_downcast_via_virtual,
Self.Diag(OpRange.getBegin(), diag::err_static_downcast_via_virtual,
OrigSrcType.getAsString(), OrigDestType.getAsString(),
VirtualBase.getAsString(), OpRange);
return TSC_Failed;
@ -589,14 +629,15 @@ Sema::TryStaticDowncast(QualType SrcType, QualType DestType,
///
/// An expression e can be explicitly converted to a type T using a
/// @c static_cast if the declaration "T t(e);" is well-formed [...].
Sema::TryStaticCastResult
Sema::TryStaticImplicitCast(Expr *SrcExpr, QualType DestType,
const SourceRange &OpRange)
TryStaticCastResult
TryStaticImplicitCast(Sema &Self, Expr *SrcExpr, QualType DestType,
const SourceRange &OpRange)
{
if (DestType->isReferenceType()) {
// At this point of CheckStaticCast, if the destination is a reference,
// this has to work. There is no other way that works.
return CheckReferenceInit(SrcExpr, DestType) ? TSC_Failed : TSC_Success;
return Self.CheckReferenceInit(SrcExpr, DestType) ?
TSC_Failed : TSC_Success;
}
if (DestType->isRecordType()) {
// FIXME: Use an implementation of C++ [over.match.ctor] for this.
@ -605,7 +646,8 @@ Sema::TryStaticImplicitCast(Expr *SrcExpr, QualType DestType,
// FIXME: To get a proper error from invalid conversions here, we need to
// reimplement more of this.
ImplicitConversionSequence ICS = TryImplicitConversion(SrcExpr, DestType);
ImplicitConversionSequence ICS = Self.TryImplicitConversion(
SrcExpr, DestType);
return ICS.ConversionKind == ImplicitConversionSequence::BadConversion ?
TSC_NotApplicable : TSC_Success;
}
@ -614,12 +656,12 @@ Sema::TryStaticImplicitCast(Expr *SrcExpr, QualType DestType,
/// Refer to C++ 5.2.7 for details. Dynamic casts are used mostly for runtime-
/// checked downcasts in class hierarchies.
void
Sema::CheckDynamicCast(Expr *&SrcExpr, QualType DestType,
const SourceRange &OpRange,
const SourceRange &DestRange)
CheckDynamicCast(Sema &Self, Expr *&SrcExpr, QualType DestType,
const SourceRange &OpRange,
const SourceRange &DestRange)
{
QualType OrigDestType = DestType, OrigSrcType = SrcExpr->getType();
DestType = Context.getCanonicalType(DestType);
DestType = Self.Context.getCanonicalType(DestType);
// C++ 5.2.7p1: T shall be a pointer or reference to a complete class type,
// or "pointer to cv void".
@ -632,7 +674,7 @@ Sema::CheckDynamicCast(Expr *&SrcExpr, QualType DestType,
} else if (DestReference) {
DestPointee = DestReference->getPointeeType();
} else {
Diag(OpRange.getBegin(), diag::err_bad_dynamic_cast_not_ref_or_ptr,
Self.Diag(OpRange.getBegin(), diag::err_bad_dynamic_cast_not_ref_or_ptr,
OrigDestType.getAsString(), DestRange);
return;
}
@ -642,12 +684,12 @@ Sema::CheckDynamicCast(Expr *&SrcExpr, QualType DestType,
assert(DestPointer && "Reference to void is not possible");
} else if (DestRecord) {
if (!DestRecord->getDecl()->isDefinition()) {
Diag(OpRange.getBegin(), diag::err_bad_dynamic_cast_incomplete,
Self.Diag(OpRange.getBegin(), diag::err_bad_dynamic_cast_incomplete,
DestPointee.getUnqualifiedType().getAsString(), DestRange);
return;
}
} else {
Diag(OpRange.getBegin(), diag::err_bad_dynamic_cast_not_class,
Self.Diag(OpRange.getBegin(), diag::err_bad_dynamic_cast_not_class,
DestPointee.getUnqualifiedType().getAsString(), DestRange);
return;
}
@ -656,20 +698,20 @@ Sema::CheckDynamicCast(Expr *&SrcExpr, QualType DestType,
// complete class type, [...]. If T is a reference type, v shall be an
// lvalue of a complete class type, [...].
QualType SrcType = Context.getCanonicalType(OrigSrcType);
QualType SrcType = Self.Context.getCanonicalType(OrigSrcType);
QualType SrcPointee;
if (DestPointer) {
if (const PointerType *SrcPointer = SrcType->getAsPointerType()) {
SrcPointee = SrcPointer->getPointeeType();
} else {
Diag(OpRange.getBegin(), diag::err_bad_dynamic_cast_not_ptr,
Self.Diag(OpRange.getBegin(), diag::err_bad_dynamic_cast_not_ptr,
OrigSrcType.getAsString(), SrcExpr->getSourceRange());
return;
}
} else {
if (SrcExpr->isLvalue(Context) != Expr::LV_Valid) {
Diag(OpRange.getBegin(), diag::err_bad_cxx_cast_rvalue, "dynamic_cast",
OrigDestType.getAsString(), OpRange);
if (SrcExpr->isLvalue(Self.Context) != Expr::LV_Valid) {
Self.Diag(OpRange.getBegin(), diag::err_bad_cxx_cast_rvalue,
"dynamic_cast", OrigDestType.getAsString(), OpRange);
}
SrcPointee = SrcType;
}
@ -677,13 +719,13 @@ Sema::CheckDynamicCast(Expr *&SrcExpr, QualType DestType,
const RecordType *SrcRecord = SrcPointee->getAsRecordType();
if (SrcRecord) {
if (!SrcRecord->getDecl()->isDefinition()) {
Diag(OpRange.getBegin(), diag::err_bad_dynamic_cast_incomplete,
Self.Diag(OpRange.getBegin(), diag::err_bad_dynamic_cast_incomplete,
SrcPointee.getUnqualifiedType().getAsString(),
SrcExpr->getSourceRange());
return;
}
} else {
Diag(OpRange.getBegin(), diag::err_bad_dynamic_cast_not_class,
Self.Diag(OpRange.getBegin(), diag::err_bad_dynamic_cast_not_class,
SrcPointee.getUnqualifiedType().getAsString(),
SrcExpr->getSourceRange());
return;
@ -697,8 +739,9 @@ Sema::CheckDynamicCast(Expr *&SrcExpr, QualType DestType,
// C++ 5.2.7p1: The dynamic_cast operator shall not cast away constness.
if (!DestPointee.isAtLeastAsQualifiedAs(SrcPointee)) {
Diag(OpRange.getBegin(), diag::err_bad_cxx_cast_const_away, "dynamic_cast",
OrigDestType.getAsString(), OrigSrcType.getAsString(), OpRange);
Self.Diag(OpRange.getBegin(), diag::err_bad_cxx_cast_const_away,
"dynamic_cast", OrigDestType.getAsString(), OrigSrcType.getAsString(),
OpRange);
return;
}
@ -710,18 +753,18 @@ Sema::CheckDynamicCast(Expr *&SrcExpr, QualType DestType,
// C++ 5.2.7p5
// Upcasts are resolved statically.
if (DestRecord && IsDerivedFrom(SrcPointee, DestPointee)) {
CheckDerivedToBaseConversion(SrcPointee, DestPointee, OpRange.getBegin(),
OpRange);
if (DestRecord && Self.IsDerivedFrom(SrcPointee, DestPointee)) {
Self.CheckDerivedToBaseConversion(SrcPointee, DestPointee,
OpRange.getBegin(), OpRange);
// Diagnostic already emitted on error.
return;
}
// C++ 5.2.7p6: Otherwise, v shall be [polymorphic].
const RecordDecl *SrcDecl = SrcRecord->getDecl()->getDefinition(Context);
const RecordDecl *SrcDecl = SrcRecord->getDecl()->getDefinition(Self.Context);
assert(SrcDecl && "Definition missing");
if (!cast<CXXRecordDecl>(SrcDecl)->isPolymorphic()) {
Diag(OpRange.getBegin(), diag::err_bad_dynamic_cast_not_polymorphic,
Self.Diag(OpRange.getBegin(), diag::err_bad_dynamic_cast_not_polymorphic,
SrcPointee.getUnqualifiedType().getAsString(), SrcExpr->getSourceRange());
}