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clang-1/lib/Sema/SemaType.cpp

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//===--- SemaType.cpp - Semantic Analysis for Types -----------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements type-related semantic analysis.
//
//===----------------------------------------------------------------------===//
#include "Sema.h"
#include "clang/AST/ASTContext.h"
#include "clang/AST/CXXInheritance.h"
#include "clang/AST/DeclObjC.h"
#include "clang/AST/DeclTemplate.h"
#include "clang/AST/TypeLoc.h"
#include "clang/AST/TypeLocVisitor.h"
#include "clang/AST/Expr.h"
#include "clang/Basic/PartialDiagnostic.h"
#include "clang/Parse/DeclSpec.h"
#include "llvm/ADT/SmallPtrSet.h"
#include "llvm/Support/ErrorHandling.h"
using namespace clang;
/// \brief Perform adjustment on the parameter type of a function.
///
/// This routine adjusts the given parameter type @p T to the actual
/// parameter type used by semantic analysis (C99 6.7.5.3p[7,8],
/// C++ [dcl.fct]p3). The adjusted parameter type is returned.
QualType Sema::adjustParameterType(QualType T) {
// C99 6.7.5.3p7:
// A declaration of a parameter as "array of type" shall be
// adjusted to "qualified pointer to type", where the type
// qualifiers (if any) are those specified within the [ and ] of
// the array type derivation.
if (T->isArrayType())
return Context.getArrayDecayedType(T);
// C99 6.7.5.3p8:
// A declaration of a parameter as "function returning type"
// shall be adjusted to "pointer to function returning type", as
// in 6.3.2.1.
if (T->isFunctionType())
return Context.getPointerType(T);
return T;
}
/// isOmittedBlockReturnType - Return true if this declarator is missing a
/// return type because this is a omitted return type on a block literal.
static bool isOmittedBlockReturnType(const Declarator &D) {
if (D.getContext() != Declarator::BlockLiteralContext ||
D.getDeclSpec().hasTypeSpecifier())
return false;
if (D.getNumTypeObjects() == 0)
return true; // ^{ ... }
if (D.getNumTypeObjects() == 1 &&
D.getTypeObject(0).Kind == DeclaratorChunk::Function)
return true; // ^(int X, float Y) { ... }
return false;
}
/// \brief Convert the specified declspec to the appropriate type
/// object.
/// \param D the declarator containing the declaration specifier.
/// \returns The type described by the declaration specifiers. This function
/// never returns null.
static QualType ConvertDeclSpecToType(Declarator &TheDeclarator, Sema &TheSema){
// FIXME: Should move the logic from DeclSpec::Finish to here for validity
// checking.
const DeclSpec &DS = TheDeclarator.getDeclSpec();
SourceLocation DeclLoc = TheDeclarator.getIdentifierLoc();
if (DeclLoc.isInvalid())
DeclLoc = DS.getSourceRange().getBegin();
ASTContext &Context = TheSema.Context;
QualType Result;
switch (DS.getTypeSpecType()) {
case DeclSpec::TST_void:
Result = Context.VoidTy;
break;
case DeclSpec::TST_char:
if (DS.getTypeSpecSign() == DeclSpec::TSS_unspecified)
Result = Context.CharTy;
else if (DS.getTypeSpecSign() == DeclSpec::TSS_signed)
Result = Context.SignedCharTy;
else {
assert(DS.getTypeSpecSign() == DeclSpec::TSS_unsigned &&
"Unknown TSS value");
Result = Context.UnsignedCharTy;
}
break;
case DeclSpec::TST_wchar:
if (DS.getTypeSpecSign() == DeclSpec::TSS_unspecified)
Result = Context.WCharTy;
else if (DS.getTypeSpecSign() == DeclSpec::TSS_signed) {
TheSema.Diag(DS.getTypeSpecSignLoc(), diag::ext_invalid_sign_spec)
<< DS.getSpecifierName(DS.getTypeSpecType());
Result = Context.getSignedWCharType();
} else {
assert(DS.getTypeSpecSign() == DeclSpec::TSS_unsigned &&
"Unknown TSS value");
TheSema.Diag(DS.getTypeSpecSignLoc(), diag::ext_invalid_sign_spec)
<< DS.getSpecifierName(DS.getTypeSpecType());
Result = Context.getUnsignedWCharType();
}
break;
case DeclSpec::TST_char16:
assert(DS.getTypeSpecSign() == DeclSpec::TSS_unspecified &&
"Unknown TSS value");
Result = Context.Char16Ty;
break;
case DeclSpec::TST_char32:
assert(DS.getTypeSpecSign() == DeclSpec::TSS_unspecified &&
"Unknown TSS value");
Result = Context.Char32Ty;
break;
case DeclSpec::TST_unspecified:
// "<proto1,proto2>" is an objc qualified ID with a missing id.
if (DeclSpec::ProtocolQualifierListTy PQ = DS.getProtocolQualifiers()) {
Result = Context.getObjCObjectPointerType(Context.ObjCBuiltinIdTy,
(ObjCProtocolDecl**)PQ,
DS.getNumProtocolQualifiers());
break;
}
// If this is a missing declspec in a block literal return context, then it
// is inferred from the return statements inside the block.
if (isOmittedBlockReturnType(TheDeclarator)) {
Result = Context.DependentTy;
break;
}
// Unspecified typespec defaults to int in C90. However, the C90 grammar
// [C90 6.5] only allows a decl-spec if there was *some* type-specifier,
// type-qualifier, or storage-class-specifier. If not, emit an extwarn.
// Note that the one exception to this is function definitions, which are
// allowed to be completely missing a declspec. This is handled in the
// parser already though by it pretending to have seen an 'int' in this
// case.
if (TheSema.getLangOptions().ImplicitInt) {
// In C89 mode, we only warn if there is a completely missing declspec
// when one is not allowed.
if (DS.isEmpty()) {
TheSema.Diag(DeclLoc, diag::ext_missing_declspec)
<< DS.getSourceRange()
<< CodeModificationHint::CreateInsertion(DS.getSourceRange().getBegin(),
"int");
}
} else if (!DS.hasTypeSpecifier()) {
// C99 and C++ require a type specifier. For example, C99 6.7.2p2 says:
// "At least one type specifier shall be given in the declaration
// specifiers in each declaration, and in the specifier-qualifier list in
// each struct declaration and type name."
// FIXME: Does Microsoft really have the implicit int extension in C++?
if (TheSema.getLangOptions().CPlusPlus &&
!TheSema.getLangOptions().Microsoft) {
TheSema.Diag(DeclLoc, diag::err_missing_type_specifier)
<< DS.getSourceRange();
// When this occurs in C++ code, often something is very broken with the
// value being declared, poison it as invalid so we don't get chains of
// errors.
TheDeclarator.setInvalidType(true);
} else {
TheSema.Diag(DeclLoc, diag::ext_missing_type_specifier)
<< DS.getSourceRange();
}
}
// FALL THROUGH.
case DeclSpec::TST_int: {
if (DS.getTypeSpecSign() != DeclSpec::TSS_unsigned) {
switch (DS.getTypeSpecWidth()) {
case DeclSpec::TSW_unspecified: Result = Context.IntTy; break;
case DeclSpec::TSW_short: Result = Context.ShortTy; break;
case DeclSpec::TSW_long: Result = Context.LongTy; break;
case DeclSpec::TSW_longlong:
Result = Context.LongLongTy;
// long long is a C99 feature.
if (!TheSema.getLangOptions().C99 &&
!TheSema.getLangOptions().CPlusPlus0x)
TheSema.Diag(DS.getTypeSpecWidthLoc(), diag::ext_longlong);
break;
}
} else {
switch (DS.getTypeSpecWidth()) {
case DeclSpec::TSW_unspecified: Result = Context.UnsignedIntTy; break;
case DeclSpec::TSW_short: Result = Context.UnsignedShortTy; break;
case DeclSpec::TSW_long: Result = Context.UnsignedLongTy; break;
case DeclSpec::TSW_longlong:
Result = Context.UnsignedLongLongTy;
// long long is a C99 feature.
if (!TheSema.getLangOptions().C99 &&
!TheSema.getLangOptions().CPlusPlus0x)
TheSema.Diag(DS.getTypeSpecWidthLoc(), diag::ext_longlong);
break;
}
}
break;
}
case DeclSpec::TST_float: Result = Context.FloatTy; break;
case DeclSpec::TST_double:
if (DS.getTypeSpecWidth() == DeclSpec::TSW_long)
Result = Context.LongDoubleTy;
else
Result = Context.DoubleTy;
break;
case DeclSpec::TST_bool: Result = Context.BoolTy; break; // _Bool or bool
case DeclSpec::TST_decimal32: // _Decimal32
case DeclSpec::TST_decimal64: // _Decimal64
case DeclSpec::TST_decimal128: // _Decimal128
TheSema.Diag(DS.getTypeSpecTypeLoc(), diag::err_decimal_unsupported);
Result = Context.IntTy;
TheDeclarator.setInvalidType(true);
break;
case DeclSpec::TST_class:
case DeclSpec::TST_enum:
case DeclSpec::TST_union:
case DeclSpec::TST_struct: {
TypeDecl *D
= dyn_cast_or_null<TypeDecl>(static_cast<Decl *>(DS.getTypeRep()));
if (!D) {
// This can happen in C++ with ambiguous lookups.
Result = Context.IntTy;
TheDeclarator.setInvalidType(true);
break;
}
// If the type is deprecated or unavailable, diagnose it.
TheSema.DiagnoseUseOfDecl(D, DS.getTypeSpecTypeLoc());
assert(DS.getTypeSpecWidth() == 0 && DS.getTypeSpecComplex() == 0 &&
DS.getTypeSpecSign() == 0 && "No qualifiers on tag names!");
// TypeQuals handled by caller.
Result = Context.getTypeDeclType(D);
// In C++, make an ElaboratedType.
if (TheSema.getLangOptions().CPlusPlus) {
TagDecl::TagKind Tag
= TagDecl::getTagKindForTypeSpec(DS.getTypeSpecType());
Result = Context.getElaboratedType(Result, Tag);
}
if (D->isInvalidDecl())
TheDeclarator.setInvalidType(true);
break;
}
case DeclSpec::TST_typename: {
assert(DS.getTypeSpecWidth() == 0 && DS.getTypeSpecComplex() == 0 &&
DS.getTypeSpecSign() == 0 &&
"Can't handle qualifiers on typedef names yet!");
Result = TheSema.GetTypeFromParser(DS.getTypeRep());
if (DeclSpec::ProtocolQualifierListTy PQ = DS.getProtocolQualifiers()) {
if (const ObjCInterfaceType *
Interface = Result->getAs<ObjCInterfaceType>()) {
// It would be nice if protocol qualifiers were only stored with the
// ObjCObjectPointerType. Unfortunately, this isn't possible due
// to the following typedef idiom (which is uncommon, but allowed):
//
// typedef Foo<P> T;
// static void func() {
// Foo<P> *yy;
// T *zz;
// }
Result = Context.getObjCInterfaceType(Interface->getDecl(),
(ObjCProtocolDecl**)PQ,
DS.getNumProtocolQualifiers());
} else if (Result->isObjCIdType())
// id<protocol-list>
Result = Context.getObjCObjectPointerType(Context.ObjCBuiltinIdTy,
(ObjCProtocolDecl**)PQ, DS.getNumProtocolQualifiers());
else if (Result->isObjCClassType()) {
// Class<protocol-list>
Result = Context.getObjCObjectPointerType(Context.ObjCBuiltinClassTy,
(ObjCProtocolDecl**)PQ, DS.getNumProtocolQualifiers());
} else {
TheSema.Diag(DeclLoc, diag::err_invalid_protocol_qualifiers)
<< DS.getSourceRange();
TheDeclarator.setInvalidType(true);
}
}
// TypeQuals handled by caller.
break;
}
case DeclSpec::TST_typeofType:
// FIXME: Preserve type source info.
Result = TheSema.GetTypeFromParser(DS.getTypeRep());
assert(!Result.isNull() && "Didn't get a type for typeof?");
// TypeQuals handled by caller.
Result = Context.getTypeOfType(Result);
break;
case DeclSpec::TST_typeofExpr: {
Expr *E = static_cast<Expr *>(DS.getTypeRep());
assert(E && "Didn't get an expression for typeof?");
// TypeQuals handled by caller.
Result = Context.getTypeOfExprType(E);
break;
}
case DeclSpec::TST_decltype: {
Expr *E = static_cast<Expr *>(DS.getTypeRep());
assert(E && "Didn't get an expression for decltype?");
// TypeQuals handled by caller.
Result = TheSema.BuildDecltypeType(E);
if (Result.isNull()) {
Result = Context.IntTy;
TheDeclarator.setInvalidType(true);
}
break;
}
case DeclSpec::TST_auto: {
// TypeQuals handled by caller.
Result = Context.UndeducedAutoTy;
break;
}
case DeclSpec::TST_error:
Result = Context.IntTy;
TheDeclarator.setInvalidType(true);
break;
}
// Handle complex types.
if (DS.getTypeSpecComplex() == DeclSpec::TSC_complex) {
if (TheSema.getLangOptions().Freestanding)
TheSema.Diag(DS.getTypeSpecComplexLoc(), diag::ext_freestanding_complex);
Result = Context.getComplexType(Result);
}
assert(DS.getTypeSpecComplex() != DeclSpec::TSC_imaginary &&
"FIXME: imaginary types not supported yet!");
// See if there are any attributes on the declspec that apply to the type (as
// opposed to the decl).
if (const AttributeList *AL = DS.getAttributes())
TheSema.ProcessTypeAttributeList(Result, AL);
// Apply const/volatile/restrict qualifiers to T.
if (unsigned TypeQuals = DS.getTypeQualifiers()) {
// Enforce C99 6.7.3p2: "Types other than pointer types derived from object
// or incomplete types shall not be restrict-qualified." C++ also allows
// restrict-qualified references.
if (TypeQuals & DeclSpec::TQ_restrict) {
if (Result->isAnyPointerType() || Result->isReferenceType()) {
QualType EltTy;
if (Result->isObjCObjectPointerType())
EltTy = Result;
else
EltTy = Result->isPointerType() ?
Result->getAs<PointerType>()->getPointeeType() :
Result->getAs<ReferenceType>()->getPointeeType();
// If we have a pointer or reference, the pointee must have an object
// incomplete type.
if (!EltTy->isIncompleteOrObjectType()) {
TheSema.Diag(DS.getRestrictSpecLoc(),
diag::err_typecheck_invalid_restrict_invalid_pointee)
<< EltTy << DS.getSourceRange();
TypeQuals &= ~DeclSpec::TQ_restrict; // Remove the restrict qualifier.
}
} else {
TheSema.Diag(DS.getRestrictSpecLoc(),
diag::err_typecheck_invalid_restrict_not_pointer)
<< Result << DS.getSourceRange();
TypeQuals &= ~DeclSpec::TQ_restrict; // Remove the restrict qualifier.
}
}
// Warn about CV qualifiers on functions: C99 6.7.3p8: "If the specification
// of a function type includes any type qualifiers, the behavior is
// undefined."
if (Result->isFunctionType() && TypeQuals) {
// Get some location to point at, either the C or V location.
SourceLocation Loc;
if (TypeQuals & DeclSpec::TQ_const)
Loc = DS.getConstSpecLoc();
else if (TypeQuals & DeclSpec::TQ_volatile)
Loc = DS.getVolatileSpecLoc();
else {
assert((TypeQuals & DeclSpec::TQ_restrict) &&
"Has CVR quals but not C, V, or R?");
Loc = DS.getRestrictSpecLoc();
}
TheSema.Diag(Loc, diag::warn_typecheck_function_qualifiers)
<< Result << DS.getSourceRange();
}
// C++ [dcl.ref]p1:
// Cv-qualified references are ill-formed except when the
// cv-qualifiers are introduced through the use of a typedef
// (7.1.3) or of a template type argument (14.3), in which
// case the cv-qualifiers are ignored.
// FIXME: Shouldn't we be checking SCS_typedef here?
if (DS.getTypeSpecType() == DeclSpec::TST_typename &&
TypeQuals && Result->isReferenceType()) {
TypeQuals &= ~DeclSpec::TQ_const;
TypeQuals &= ~DeclSpec::TQ_volatile;
}
Qualifiers Quals = Qualifiers::fromCVRMask(TypeQuals);
Result = Context.getQualifiedType(Result, Quals);
}
return Result;
}
static std::string getPrintableNameForEntity(DeclarationName Entity) {
if (Entity)
return Entity.getAsString();
return "type name";
}
/// \brief Build a pointer type.
///
/// \param T The type to which we'll be building a pointer.
///
/// \param Quals The cvr-qualifiers to be applied to the pointer type.
///
/// \param Loc The location of the entity whose type involves this
/// pointer type or, if there is no such entity, the location of the
/// type that will have pointer type.
///
/// \param Entity The name of the entity that involves the pointer
/// type, if known.
///
/// \returns A suitable pointer type, if there are no
/// errors. Otherwise, returns a NULL type.
QualType Sema::BuildPointerType(QualType T, unsigned Quals,
SourceLocation Loc, DeclarationName Entity) {
if (T->isReferenceType()) {
// C++ 8.3.2p4: There shall be no ... pointers to references ...
Diag(Loc, diag::err_illegal_decl_pointer_to_reference)
<< getPrintableNameForEntity(Entity) << T;
return QualType();
}
Qualifiers Qs = Qualifiers::fromCVRMask(Quals);
// Enforce C99 6.7.3p2: "Types other than pointer types derived from
// object or incomplete types shall not be restrict-qualified."
if (Qs.hasRestrict() && !T->isIncompleteOrObjectType()) {
Diag(Loc, diag::err_typecheck_invalid_restrict_invalid_pointee)
<< T;
Qs.removeRestrict();
}
// Build the pointer type.
return Context.getQualifiedType(Context.getPointerType(T), Qs);
}
/// \brief Build a reference type.
///
/// \param T The type to which we'll be building a reference.
///
/// \param CVR The cvr-qualifiers to be applied to the reference type.
///
/// \param Loc The location of the entity whose type involves this
/// reference type or, if there is no such entity, the location of the
/// type that will have reference type.
///
/// \param Entity The name of the entity that involves the reference
/// type, if known.
///
/// \returns A suitable reference type, if there are no
/// errors. Otherwise, returns a NULL type.
QualType Sema::BuildReferenceType(QualType T, bool SpelledAsLValue,
unsigned CVR, SourceLocation Loc,
DeclarationName Entity) {
Qualifiers Quals = Qualifiers::fromCVRMask(CVR);
bool LValueRef = SpelledAsLValue || T->getAs<LValueReferenceType>();
// C++0x [dcl.typedef]p9: If a typedef TD names a type that is a
// reference to a type T, and attempt to create the type "lvalue
// reference to cv TD" creates the type "lvalue reference to T".
// We use the qualifiers (restrict or none) of the original reference,
// not the new ones. This is consistent with GCC.
// C++ [dcl.ref]p4: There shall be no references to references.
//
// According to C++ DR 106, references to references are only
// diagnosed when they are written directly (e.g., "int & &"),
// but not when they happen via a typedef:
//
// typedef int& intref;
// typedef intref& intref2;
//
// Parser::ParseDeclaratorInternal diagnoses the case where
// references are written directly; here, we handle the
// collapsing of references-to-references as described in C++
// DR 106 and amended by C++ DR 540.
// C++ [dcl.ref]p1:
// A declarator that specifies the type "reference to cv void"
// is ill-formed.
if (T->isVoidType()) {
Diag(Loc, diag::err_reference_to_void);
return QualType();
}
// Enforce C99 6.7.3p2: "Types other than pointer types derived from
// object or incomplete types shall not be restrict-qualified."
if (Quals.hasRestrict() && !T->isIncompleteOrObjectType()) {
Diag(Loc, diag::err_typecheck_invalid_restrict_invalid_pointee)
<< T;
Quals.removeRestrict();
}
// C++ [dcl.ref]p1:
// [...] Cv-qualified references are ill-formed except when the
// cv-qualifiers are introduced through the use of a typedef
// (7.1.3) or of a template type argument (14.3), in which case
// the cv-qualifiers are ignored.
//
// We diagnose extraneous cv-qualifiers for the non-typedef,
// non-template type argument case within the parser. Here, we just
// ignore any extraneous cv-qualifiers.
Quals.removeConst();
Quals.removeVolatile();
// Handle restrict on references.
if (LValueRef)
return Context.getQualifiedType(
Context.getLValueReferenceType(T, SpelledAsLValue), Quals);
return Context.getQualifiedType(Context.getRValueReferenceType(T), Quals);
}
/// \brief Build an array type.
///
/// \param T The type of each element in the array.
///
/// \param ASM C99 array size modifier (e.g., '*', 'static').
///
/// \param ArraySize Expression describing the size of the array.
///
/// \param Quals The cvr-qualifiers to be applied to the array's
/// element type.
///
/// \param Loc The location of the entity whose type involves this
/// array type or, if there is no such entity, the location of the
/// type that will have array type.
///
/// \param Entity The name of the entity that involves the array
/// type, if known.
///
/// \returns A suitable array type, if there are no errors. Otherwise,
/// returns a NULL type.
QualType Sema::BuildArrayType(QualType T, ArrayType::ArraySizeModifier ASM,
Expr *ArraySize, unsigned Quals,
SourceRange Brackets, DeclarationName Entity) {
SourceLocation Loc = Brackets.getBegin();
// C99 6.7.5.2p1: If the element type is an incomplete or function type,
// reject it (e.g. void ary[7], struct foo ary[7], void ary[7]())
// Not in C++, though. There we only dislike void.
if (getLangOptions().CPlusPlus) {
if (T->isVoidType()) {
Diag(Loc, diag::err_illegal_decl_array_incomplete_type) << T;
return QualType();
}
} else {
if (RequireCompleteType(Loc, T,
diag::err_illegal_decl_array_incomplete_type))
return QualType();
}
if (T->isFunctionType()) {
Diag(Loc, diag::err_illegal_decl_array_of_functions)
<< getPrintableNameForEntity(Entity) << T;
return QualType();
}
// C++ 8.3.2p4: There shall be no ... arrays of references ...
if (T->isReferenceType()) {
Diag(Loc, diag::err_illegal_decl_array_of_references)
<< getPrintableNameForEntity(Entity) << T;
return QualType();
}
if (Context.getCanonicalType(T) == Context.UndeducedAutoTy) {
Diag(Loc, diag::err_illegal_decl_array_of_auto)
<< getPrintableNameForEntity(Entity);
return QualType();
}
if (const RecordType *EltTy = T->getAs<RecordType>()) {
// If the element type is a struct or union that contains a variadic
// array, accept it as a GNU extension: C99 6.7.2.1p2.
if (EltTy->getDecl()->hasFlexibleArrayMember())
Diag(Loc, diag::ext_flexible_array_in_array) << T;
} else if (T->isObjCInterfaceType()) {
Diag(Loc, diag::err_objc_array_of_interfaces) << T;
return QualType();
}
// C99 6.7.5.2p1: The size expression shall have integer type.
if (ArraySize && !ArraySize->isTypeDependent() &&
!ArraySize->getType()->isIntegerType()) {
Diag(ArraySize->getLocStart(), diag::err_array_size_non_int)
<< ArraySize->getType() << ArraySize->getSourceRange();
ArraySize->Destroy(Context);
return QualType();
}
llvm::APSInt ConstVal(32);
if (!ArraySize) {
if (ASM == ArrayType::Star)
T = Context.getVariableArrayType(T, 0, ASM, Quals, Brackets);
else
T = Context.getIncompleteArrayType(T, ASM, Quals);
} else if (ArraySize->isValueDependent()) {
T = Context.getDependentSizedArrayType(T, ArraySize, ASM, Quals, Brackets);
} else if (!ArraySize->isIntegerConstantExpr(ConstVal, Context) ||
(!T->isDependentType() && !T->isIncompleteType() &&
!T->isConstantSizeType())) {
// Per C99, a variable array is an array with either a non-constant
// size or an element type that has a non-constant-size
T = Context.getVariableArrayType(T, ArraySize, ASM, Quals, Brackets);
} else {
// C99 6.7.5.2p1: If the expression is a constant expression, it shall
// have a value greater than zero.
if (ConstVal.isSigned() && ConstVal.isNegative()) {
Diag(ArraySize->getLocStart(),
diag::err_typecheck_negative_array_size)
<< ArraySize->getSourceRange();
return QualType();
}
if (ConstVal == 0) {
// GCC accepts zero sized static arrays.
Diag(ArraySize->getLocStart(), diag::ext_typecheck_zero_array_size)
<< ArraySize->getSourceRange();
}
T = Context.getConstantArrayType(T, ConstVal, ASM, Quals);
}
// If this is not C99, extwarn about VLA's and C99 array size modifiers.
if (!getLangOptions().C99) {
if (ArraySize && !ArraySize->isTypeDependent() &&
!ArraySize->isValueDependent() &&
!ArraySize->isIntegerConstantExpr(Context))
Diag(Loc, getLangOptions().CPlusPlus? diag::err_vla_cxx : diag::ext_vla);
else if (ASM != ArrayType::Normal || Quals != 0)
Diag(Loc,
getLangOptions().CPlusPlus? diag::err_c99_array_usage_cxx
: diag::ext_c99_array_usage);
}
return T;
}
/// \brief Build an ext-vector type.
///
/// Run the required checks for the extended vector type.
QualType Sema::BuildExtVectorType(QualType T, ExprArg ArraySize,
SourceLocation AttrLoc) {
Expr *Arg = (Expr *)ArraySize.get();
// unlike gcc's vector_size attribute, we do not allow vectors to be defined
// in conjunction with complex types (pointers, arrays, functions, etc.).
if (!T->isDependentType() &&
!T->isIntegerType() && !T->isRealFloatingType()) {
Diag(AttrLoc, diag::err_attribute_invalid_vector_type) << T;
return QualType();
}
if (!Arg->isTypeDependent() && !Arg->isValueDependent()) {
llvm::APSInt vecSize(32);
if (!Arg->isIntegerConstantExpr(vecSize, Context)) {
Diag(AttrLoc, diag::err_attribute_argument_not_int)
<< "ext_vector_type" << Arg->getSourceRange();
return QualType();
}
// unlike gcc's vector_size attribute, the size is specified as the
// number of elements, not the number of bytes.
unsigned vectorSize = static_cast<unsigned>(vecSize.getZExtValue());
if (vectorSize == 0) {
Diag(AttrLoc, diag::err_attribute_zero_size)
<< Arg->getSourceRange();
return QualType();
}
if (!T->isDependentType())
return Context.getExtVectorType(T, vectorSize);
}
return Context.getDependentSizedExtVectorType(T, ArraySize.takeAs<Expr>(),
AttrLoc);
}
/// \brief Build a function type.
///
/// This routine checks the function type according to C++ rules and
/// under the assumption that the result type and parameter types have
/// just been instantiated from a template. It therefore duplicates
/// some of the behavior of GetTypeForDeclarator, but in a much
/// simpler form that is only suitable for this narrow use case.
///
/// \param T The return type of the function.
///
/// \param ParamTypes The parameter types of the function. This array
/// will be modified to account for adjustments to the types of the
/// function parameters.
///
/// \param NumParamTypes The number of parameter types in ParamTypes.
///
/// \param Variadic Whether this is a variadic function type.
///
/// \param Quals The cvr-qualifiers to be applied to the function type.
///
/// \param Loc The location of the entity whose type involves this
/// function type or, if there is no such entity, the location of the
/// type that will have function type.
///
/// \param Entity The name of the entity that involves the function
/// type, if known.
///
/// \returns A suitable function type, if there are no
/// errors. Otherwise, returns a NULL type.
QualType Sema::BuildFunctionType(QualType T,
QualType *ParamTypes,
unsigned NumParamTypes,
bool Variadic, unsigned Quals,
SourceLocation Loc, DeclarationName Entity) {
if (T->isArrayType() || T->isFunctionType()) {
Diag(Loc, diag::err_func_returning_array_function) << T;
return QualType();
}
bool Invalid = false;
for (unsigned Idx = 0; Idx < NumParamTypes; ++Idx) {
QualType ParamType = adjustParameterType(ParamTypes[Idx]);
if (ParamType->isVoidType()) {
Diag(Loc, diag::err_param_with_void_type);
Invalid = true;
}
ParamTypes[Idx] = ParamType;
}
if (Invalid)
return QualType();
return Context.getFunctionType(T, ParamTypes, NumParamTypes, Variadic,
Quals);
}
/// \brief Build a member pointer type \c T Class::*.
///
/// \param T the type to which the member pointer refers.
/// \param Class the class type into which the member pointer points.
/// \param CVR Qualifiers applied to the member pointer type
/// \param Loc the location where this type begins
/// \param Entity the name of the entity that will have this member pointer type
///
/// \returns a member pointer type, if successful, or a NULL type if there was
/// an error.
QualType Sema::BuildMemberPointerType(QualType T, QualType Class,
unsigned CVR, SourceLocation Loc,
DeclarationName Entity) {
Qualifiers Quals = Qualifiers::fromCVRMask(CVR);
// Verify that we're not building a pointer to pointer to function with
// exception specification.
if (CheckDistantExceptionSpec(T)) {
Diag(Loc, diag::err_distant_exception_spec);
// FIXME: If we're doing this as part of template instantiation,
// we should return immediately.
// Build the type anyway, but use the canonical type so that the
// exception specifiers are stripped off.
T = Context.getCanonicalType(T);
}
// C++ 8.3.3p3: A pointer to member shall not pointer to ... a member
// with reference type, or "cv void."
if (T->isReferenceType()) {
Diag(Loc, diag::err_illegal_decl_mempointer_to_reference)
<< (Entity? Entity.getAsString() : "type name") << T;
return QualType();
}
if (T->isVoidType()) {
Diag(Loc, diag::err_illegal_decl_mempointer_to_void)
<< (Entity? Entity.getAsString() : "type name");
return QualType();
}
// Enforce C99 6.7.3p2: "Types other than pointer types derived from
// object or incomplete types shall not be restrict-qualified."
if (Quals.hasRestrict() && !T->isIncompleteOrObjectType()) {
Diag(Loc, diag::err_typecheck_invalid_restrict_invalid_pointee)
<< T;
// FIXME: If we're doing this as part of template instantiation,
// we should return immediately.
Quals.removeRestrict();
}
if (!Class->isDependentType() && !Class->isRecordType()) {
Diag(Loc, diag::err_mempointer_in_nonclass_type) << Class;
return QualType();
}
return Context.getQualifiedType(
Context.getMemberPointerType(T, Class.getTypePtr()), Quals);
}
/// \brief Build a block pointer type.
///
/// \param T The type to which we'll be building a block pointer.
///
/// \param CVR The cvr-qualifiers to be applied to the block pointer type.
///
/// \param Loc The location of the entity whose type involves this
/// block pointer type or, if there is no such entity, the location of the
/// type that will have block pointer type.
///
/// \param Entity The name of the entity that involves the block pointer
/// type, if known.
///
/// \returns A suitable block pointer type, if there are no
/// errors. Otherwise, returns a NULL type.
QualType Sema::BuildBlockPointerType(QualType T, unsigned CVR,
SourceLocation Loc,
DeclarationName Entity) {
if (!T->isFunctionType()) {
Diag(Loc, diag::err_nonfunction_block_type);
return QualType();
}
Qualifiers Quals = Qualifiers::fromCVRMask(CVR);
return Context.getQualifiedType(Context.getBlockPointerType(T), Quals);
}
QualType Sema::GetTypeFromParser(TypeTy *Ty, TypeSourceInfo **TInfo) {
QualType QT = QualType::getFromOpaquePtr(Ty);
if (QT.isNull()) {
if (TInfo) *TInfo = 0;
return QualType();
}
TypeSourceInfo *DI = 0;
if (LocInfoType *LIT = dyn_cast<LocInfoType>(QT)) {
QT = LIT->getType();
DI = LIT->getTypeSourceInfo();
}
if (TInfo) *TInfo = DI;
return QT;
}
/// GetTypeForDeclarator - Convert the type for the specified
/// declarator to Type instances.
///
/// If OwnedDecl is non-NULL, and this declarator's decl-specifier-seq
/// owns the declaration of a type (e.g., the definition of a struct
/// type), then *OwnedDecl will receive the owned declaration.
QualType Sema::GetTypeForDeclarator(Declarator &D, Scope *S,
TypeSourceInfo **TInfo,
TagDecl **OwnedDecl) {
// Determine the type of the declarator. Not all forms of declarator
// have a type.
QualType T;
switch (D.getName().getKind()) {
case UnqualifiedId::IK_Identifier:
case UnqualifiedId::IK_OperatorFunctionId:
case UnqualifiedId::IK_LiteralOperatorId:
case UnqualifiedId::IK_TemplateId:
T = ConvertDeclSpecToType(D, *this);
if (!D.isInvalidType() && OwnedDecl && D.getDeclSpec().isTypeSpecOwned())
*OwnedDecl = cast<TagDecl>((Decl *)D.getDeclSpec().getTypeRep());
break;
case UnqualifiedId::IK_ConstructorName:
case UnqualifiedId::IK_DestructorName:
case UnqualifiedId::IK_ConversionFunctionId:
// Constructors and destructors don't have return types. Use
// "void" instead. Conversion operators will check their return
// types separately.
T = Context.VoidTy;
break;
}
if (T.isNull())
return T;
if (T == Context.UndeducedAutoTy) {
int Error = -1;
switch (D.getContext()) {
case Declarator::KNRTypeListContext:
assert(0 && "K&R type lists aren't allowed in C++");
break;
case Declarator::PrototypeContext:
Error = 0; // Function prototype
break;
case Declarator::MemberContext:
switch (cast<TagDecl>(CurContext)->getTagKind()) {
case TagDecl::TK_enum: assert(0 && "unhandled tag kind"); break;
case TagDecl::TK_struct: Error = 1; /* Struct member */ break;
case TagDecl::TK_union: Error = 2; /* Union member */ break;
case TagDecl::TK_class: Error = 3; /* Class member */ break;
}
break;
case Declarator::CXXCatchContext:
Error = 4; // Exception declaration
break;
case Declarator::TemplateParamContext:
Error = 5; // Template parameter
break;
case Declarator::BlockLiteralContext:
Error = 6; // Block literal
break;
case Declarator::FileContext:
case Declarator::BlockContext:
case Declarator::ForContext:
case Declarator::ConditionContext:
case Declarator::TypeNameContext:
break;
}
if (Error != -1) {
Diag(D.getDeclSpec().getTypeSpecTypeLoc(), diag::err_auto_not_allowed)
<< Error;
T = Context.IntTy;
D.setInvalidType(true);
}
}
// The name we're declaring, if any.
DeclarationName Name;
if (D.getIdentifier())
Name = D.getIdentifier();
// Walk the DeclTypeInfo, building the recursive type as we go.
// DeclTypeInfos are ordered from the identifier out, which is
// opposite of what we want :).
for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) {
DeclaratorChunk &DeclType = D.getTypeObject(e-i-1);
switch (DeclType.Kind) {
default: assert(0 && "Unknown decltype!");
case DeclaratorChunk::BlockPointer:
// If blocks are disabled, emit an error.
if (!LangOpts.Blocks)
Diag(DeclType.Loc, diag::err_blocks_disable);
T = BuildBlockPointerType(T, DeclType.Cls.TypeQuals, D.getIdentifierLoc(),
Name);
break;
case DeclaratorChunk::Pointer:
// Verify that we're not building a pointer to pointer to function with
// exception specification.
if (getLangOptions().CPlusPlus && CheckDistantExceptionSpec(T)) {
Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec);
D.setInvalidType(true);
// Build the type anyway.
}
if (getLangOptions().ObjC1 && T->isObjCInterfaceType()) {
const ObjCInterfaceType *OIT = T->getAs<ObjCInterfaceType>();
T = Context.getObjCObjectPointerType(T,
(ObjCProtocolDecl **)OIT->qual_begin(),
OIT->getNumProtocols());
break;
}
T = BuildPointerType(T, DeclType.Ptr.TypeQuals, DeclType.Loc, Name);
break;
case DeclaratorChunk::Reference: {
Qualifiers Quals;
if (DeclType.Ref.HasRestrict) Quals.addRestrict();
// Verify that we're not building a reference to pointer to function with
// exception specification.
if (getLangOptions().CPlusPlus && CheckDistantExceptionSpec(T)) {
Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec);
D.setInvalidType(true);
// Build the type anyway.
}
T = BuildReferenceType(T, DeclType.Ref.LValueRef, Quals,
DeclType.Loc, Name);
break;
}
case DeclaratorChunk::Array: {
// Verify that we're not building an array of pointers to function with
// exception specification.
if (getLangOptions().CPlusPlus && CheckDistantExceptionSpec(T)) {
Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec);
D.setInvalidType(true);
// Build the type anyway.
}
DeclaratorChunk::ArrayTypeInfo &ATI = DeclType.Arr;
Expr *ArraySize = static_cast<Expr*>(ATI.NumElts);
ArrayType::ArraySizeModifier ASM;
if (ATI.isStar)
ASM = ArrayType::Star;
else if (ATI.hasStatic)
ASM = ArrayType::Static;
else
ASM = ArrayType::Normal;
if (ASM == ArrayType::Star &&
D.getContext() != Declarator::PrototypeContext) {
// FIXME: This check isn't quite right: it allows star in prototypes
// for function definitions, and disallows some edge cases detailed
// in http://gcc.gnu.org/ml/gcc-patches/2009-02/msg00133.html
Diag(DeclType.Loc, diag::err_array_star_outside_prototype);
ASM = ArrayType::Normal;
D.setInvalidType(true);
}
T = BuildArrayType(T, ASM, ArraySize,
Qualifiers::fromCVRMask(ATI.TypeQuals),
SourceRange(DeclType.Loc, DeclType.EndLoc), Name);
break;
}
case DeclaratorChunk::Function: {
// If the function declarator has a prototype (i.e. it is not () and
// does not have a K&R-style identifier list), then the arguments are part
// of the type, otherwise the argument list is ().
const DeclaratorChunk::FunctionTypeInfo &FTI = DeclType.Fun;
// C99 6.7.5.3p1: The return type may not be a function or array type.
if (T->isArrayType() || T->isFunctionType()) {
Diag(DeclType.Loc, diag::err_func_returning_array_function) << T;
T = Context.IntTy;
D.setInvalidType(true);
}
if (getLangOptions().CPlusPlus && D.getDeclSpec().isTypeSpecOwned()) {
// C++ [dcl.fct]p6:
// Types shall not be defined in return or parameter types.
TagDecl *Tag = cast<TagDecl>((Decl *)D.getDeclSpec().getTypeRep());
if (Tag->isDefinition())
Diag(Tag->getLocation(), diag::err_type_defined_in_result_type)
<< Context.getTypeDeclType(Tag);
}
// Exception specs are not allowed in typedefs. Complain, but add it
// anyway.
if (FTI.hasExceptionSpec &&
D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef)
Diag(FTI.getThrowLoc(), diag::err_exception_spec_in_typedef);
if (FTI.NumArgs == 0) {
if (getLangOptions().CPlusPlus) {
// C++ 8.3.5p2: If the parameter-declaration-clause is empty, the
// function takes no arguments.
llvm::SmallVector<QualType, 4> Exceptions;
Exceptions.reserve(FTI.NumExceptions);
for (unsigned ei = 0, ee = FTI.NumExceptions; ei != ee; ++ei) {
// FIXME: Preserve type source info.
QualType ET = GetTypeFromParser(FTI.Exceptions[ei].Ty);
// Check that the type is valid for an exception spec, and drop it
// if not.
if (!CheckSpecifiedExceptionType(ET, FTI.Exceptions[ei].Range))
Exceptions.push_back(ET);
}
T = Context.getFunctionType(T, NULL, 0, FTI.isVariadic, FTI.TypeQuals,
FTI.hasExceptionSpec,
FTI.hasAnyExceptionSpec,
Exceptions.size(), Exceptions.data());
} else if (FTI.isVariadic) {
// We allow a zero-parameter variadic function in C if the
// function is marked with the "overloadable"
// attribute. Scan for this attribute now.
bool Overloadable = false;
for (const AttributeList *Attrs = D.getAttributes();
Attrs; Attrs = Attrs->getNext()) {
if (Attrs->getKind() == AttributeList::AT_overloadable) {
Overloadable = true;
break;
}
}
if (!Overloadable)
Diag(FTI.getEllipsisLoc(), diag::err_ellipsis_first_arg);
T = Context.getFunctionType(T, NULL, 0, FTI.isVariadic, 0);
} else {
// Simple void foo(), where the incoming T is the result type.
T = Context.getFunctionNoProtoType(T);
}
} else if (FTI.ArgInfo[0].Param == 0) {
// C99 6.7.5.3p3: Reject int(x,y,z) when it's not a function definition.
Diag(FTI.ArgInfo[0].IdentLoc, diag::err_ident_list_in_fn_declaration);
D.setInvalidType(true);
} else {
// Otherwise, we have a function with an argument list that is
// potentially variadic.
llvm::SmallVector<QualType, 16> ArgTys;
for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) {
ParmVarDecl *Param =
cast<ParmVarDecl>(FTI.ArgInfo[i].Param.getAs<Decl>());
QualType ArgTy = Param->getType();
assert(!ArgTy.isNull() && "Couldn't parse type?");
// Adjust the parameter type.
assert((ArgTy == adjustParameterType(ArgTy)) && "Unadjusted type?");
// Look for 'void'. void is allowed only as a single argument to a
// function with no other parameters (C99 6.7.5.3p10). We record
// int(void) as a FunctionProtoType with an empty argument list.
if (ArgTy->isVoidType()) {
// If this is something like 'float(int, void)', reject it. 'void'
// is an incomplete type (C99 6.2.5p19) and function decls cannot
// have arguments of incomplete type.
if (FTI.NumArgs != 1 || FTI.isVariadic) {
Diag(DeclType.Loc, diag::err_void_only_param);
ArgTy = Context.IntTy;
Param->setType(ArgTy);
} else if (FTI.ArgInfo[i].Ident) {
// Reject, but continue to parse 'int(void abc)'.
Diag(FTI.ArgInfo[i].IdentLoc,
diag::err_param_with_void_type);
ArgTy = Context.IntTy;
Param->setType(ArgTy);
} else {
// Reject, but continue to parse 'float(const void)'.
if (ArgTy.hasQualifiers())
Diag(DeclType.Loc, diag::err_void_param_qualified);
// Do not add 'void' to the ArgTys list.
break;
}
} else if (!FTI.hasPrototype) {
if (ArgTy->isPromotableIntegerType()) {
ArgTy = Context.getPromotedIntegerType(ArgTy);
} else if (const BuiltinType* BTy = ArgTy->getAs<BuiltinType>()) {
if (BTy->getKind() == BuiltinType::Float)
ArgTy = Context.DoubleTy;
}
}
ArgTys.push_back(ArgTy);
}
llvm::SmallVector<QualType, 4> Exceptions;
Exceptions.reserve(FTI.NumExceptions);
for (unsigned ei = 0, ee = FTI.NumExceptions; ei != ee; ++ei) {
// FIXME: Preserve type source info.
QualType ET = GetTypeFromParser(FTI.Exceptions[ei].Ty);
// Check that the type is valid for an exception spec, and drop it if
// not.
if (!CheckSpecifiedExceptionType(ET, FTI.Exceptions[ei].Range))
Exceptions.push_back(ET);
}
T = Context.getFunctionType(T, ArgTys.data(), ArgTys.size(),
FTI.isVariadic, FTI.TypeQuals,
FTI.hasExceptionSpec,
FTI.hasAnyExceptionSpec,
Exceptions.size(), Exceptions.data());
}
break;
}
case DeclaratorChunk::MemberPointer:
// Verify that we're not building a pointer to pointer to function with
// exception specification.
if (getLangOptions().CPlusPlus && CheckDistantExceptionSpec(T)) {
Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec);
D.setInvalidType(true);
// Build the type anyway.
}
// The scope spec must refer to a class, or be dependent.
QualType ClsType;
if (isDependentScopeSpecifier(DeclType.Mem.Scope())
|| dyn_cast_or_null<CXXRecordDecl>(
computeDeclContext(DeclType.Mem.Scope()))) {
NestedNameSpecifier *NNS
= (NestedNameSpecifier *)DeclType.Mem.Scope().getScopeRep();
NestedNameSpecifier *NNSPrefix = NNS->getPrefix();
switch (NNS->getKind()) {
case NestedNameSpecifier::Identifier:
ClsType = Context.getTypenameType(NNSPrefix, NNS->getAsIdentifier());
break;
case NestedNameSpecifier::Namespace:
case NestedNameSpecifier::Global:
llvm_unreachable("Nested-name-specifier must name a type");
break;
case NestedNameSpecifier::TypeSpec:
case NestedNameSpecifier::TypeSpecWithTemplate:
ClsType = QualType(NNS->getAsType(), 0);
if (NNSPrefix)
ClsType = Context.getQualifiedNameType(NNSPrefix, ClsType);
break;
}
} else {
Diag(DeclType.Mem.Scope().getBeginLoc(),
diag::err_illegal_decl_mempointer_in_nonclass)
<< (D.getIdentifier() ? D.getIdentifier()->getName() : "type name")
<< DeclType.Mem.Scope().getRange();
D.setInvalidType(true);
}
if (!ClsType.isNull())
T = BuildMemberPointerType(T, ClsType, DeclType.Mem.TypeQuals,
DeclType.Loc, D.getIdentifier());
if (T.isNull()) {
T = Context.IntTy;
D.setInvalidType(true);
}
break;
}
if (T.isNull()) {
D.setInvalidType(true);
T = Context.IntTy;
}
// See if there are any attributes on this declarator chunk.
if (const AttributeList *AL = DeclType.getAttrs())
ProcessTypeAttributeList(T, AL);
}
if (getLangOptions().CPlusPlus && T->isFunctionType()) {
const FunctionProtoType *FnTy = T->getAs<FunctionProtoType>();
assert(FnTy && "Why oh why is there not a FunctionProtoType here?");
// C++ 8.3.5p4: A cv-qualifier-seq shall only be part of the function type
// for a nonstatic member function, the function type to which a pointer
// to member refers, or the top-level function type of a function typedef
// declaration.
if (FnTy->getTypeQuals() != 0 &&
D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef &&
((D.getContext() != Declarator::MemberContext &&
(!D.getCXXScopeSpec().isSet() ||
!computeDeclContext(D.getCXXScopeSpec(), /*FIXME:*/true)
->isRecord())) ||
D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_static)) {
if (D.isFunctionDeclarator())
Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_function_type);
else
Diag(D.getIdentifierLoc(),
diag::err_invalid_qualified_typedef_function_type_use);
// Strip the cv-quals from the type.
T = Context.getFunctionType(FnTy->getResultType(), FnTy->arg_type_begin(),
FnTy->getNumArgs(), FnTy->isVariadic(), 0);
}
}
// If there were any type attributes applied to the decl itself (not the
// type, apply the type attribute to the type!)
if (const AttributeList *Attrs = D.getAttributes())
ProcessTypeAttributeList(T, Attrs);
if (TInfo) {
if (D.isInvalidType())
*TInfo = 0;
else
*TInfo = GetTypeSourceInfoForDeclarator(D, T);
}
return T;
}
namespace {
class TypeSpecLocFiller : public TypeLocVisitor<TypeSpecLocFiller> {
const DeclSpec &DS;
public:
TypeSpecLocFiller(const DeclSpec &DS) : DS(DS) {}
void VisitQualifiedTypeLoc(QualifiedTypeLoc TL) {
Visit(TL.getUnqualifiedLoc());
}
void VisitTypedefTypeLoc(TypedefTypeLoc TL) {
TL.setNameLoc(DS.getTypeSpecTypeLoc());
}
void VisitObjCInterfaceTypeLoc(ObjCInterfaceTypeLoc TL) {
TL.setNameLoc(DS.getTypeSpecTypeLoc());
if (DS.getProtocolQualifiers()) {
assert(TL.getNumProtocols() > 0);
assert(TL.getNumProtocols() == DS.getNumProtocolQualifiers());
TL.setLAngleLoc(DS.getProtocolLAngleLoc());
TL.setRAngleLoc(DS.getSourceRange().getEnd());
for (unsigned i = 0, e = DS.getNumProtocolQualifiers(); i != e; ++i)
TL.setProtocolLoc(i, DS.getProtocolLocs()[i]);
} else {
assert(TL.getNumProtocols() == 0);
TL.setLAngleLoc(SourceLocation());
TL.setRAngleLoc(SourceLocation());
}
}
void VisitObjCObjectPointerTypeLoc(ObjCObjectPointerTypeLoc TL) {
assert(TL.getNumProtocols() == DS.getNumProtocolQualifiers());
TL.setStarLoc(SourceLocation());
if (DS.getProtocolQualifiers()) {
assert(TL.getNumProtocols() > 0);
assert(TL.getNumProtocols() == DS.getNumProtocolQualifiers());
TL.setHasProtocolsAsWritten(true);
TL.setLAngleLoc(DS.getProtocolLAngleLoc());
TL.setRAngleLoc(DS.getSourceRange().getEnd());
for (unsigned i = 0, e = DS.getNumProtocolQualifiers(); i != e; ++i)
TL.setProtocolLoc(i, DS.getProtocolLocs()[i]);
} else {
assert(TL.getNumProtocols() == 0);
TL.setHasProtocolsAsWritten(false);
TL.setLAngleLoc(SourceLocation());
TL.setRAngleLoc(SourceLocation());
}
// This might not have been written with an inner type.
if (DS.getTypeSpecType() == DeclSpec::TST_unspecified) {
TL.setHasBaseTypeAsWritten(false);
TL.getBaseTypeLoc().initialize(SourceLocation());
} else {
TL.setHasBaseTypeAsWritten(true);
Visit(TL.getBaseTypeLoc());
}
}
void VisitTemplateSpecializationTypeLoc(TemplateSpecializationTypeLoc TL) {
TypeSourceInfo *TInfo = 0;
Sema::GetTypeFromParser(DS.getTypeRep(), &TInfo);
// If we got no declarator info from previous Sema routines,
// just fill with the typespec loc.
if (!TInfo) {
TL.initialize(DS.getTypeSpecTypeLoc());
return;
}
TemplateSpecializationTypeLoc OldTL =
cast<TemplateSpecializationTypeLoc>(TInfo->getTypeLoc());
TL.copy(OldTL);
}
void VisitTypeLoc(TypeLoc TL) {
// FIXME: add other typespec types and change this to an assert.
TL.initialize(DS.getTypeSpecTypeLoc());
}
};
class DeclaratorLocFiller : public TypeLocVisitor<DeclaratorLocFiller> {
const DeclaratorChunk &Chunk;
public:
DeclaratorLocFiller(const DeclaratorChunk &Chunk) : Chunk(Chunk) {}
void VisitQualifiedTypeLoc(QualifiedTypeLoc TL) {
llvm_unreachable("qualified type locs not expected here!");
}
void VisitBlockPointerTypeLoc(BlockPointerTypeLoc TL) {
assert(Chunk.Kind == DeclaratorChunk::BlockPointer);
TL.setCaretLoc(Chunk.Loc);
}
void VisitPointerTypeLoc(PointerTypeLoc TL) {
assert(Chunk.Kind == DeclaratorChunk::Pointer);
TL.setStarLoc(Chunk.Loc);
}
void VisitObjCObjectPointerTypeLoc(ObjCObjectPointerTypeLoc TL) {
assert(Chunk.Kind == DeclaratorChunk::Pointer);
TL.setStarLoc(Chunk.Loc);
TL.setHasBaseTypeAsWritten(true);
TL.setHasProtocolsAsWritten(false);
TL.setLAngleLoc(SourceLocation());
TL.setRAngleLoc(SourceLocation());
}
void VisitMemberPointerTypeLoc(MemberPointerTypeLoc TL) {
assert(Chunk.Kind == DeclaratorChunk::MemberPointer);
TL.setStarLoc(Chunk.Loc);
// FIXME: nested name specifier
}
void VisitLValueReferenceTypeLoc(LValueReferenceTypeLoc TL) {
assert(Chunk.Kind == DeclaratorChunk::Reference);
// 'Amp' is misleading: this might have been originally
/// spelled with AmpAmp.
TL.setAmpLoc(Chunk.Loc);
}
void VisitRValueReferenceTypeLoc(RValueReferenceTypeLoc TL) {
assert(Chunk.Kind == DeclaratorChunk::Reference);
assert(!Chunk.Ref.LValueRef);
TL.setAmpAmpLoc(Chunk.Loc);
}
void VisitArrayTypeLoc(ArrayTypeLoc TL) {
assert(Chunk.Kind == DeclaratorChunk::Array);
TL.setLBracketLoc(Chunk.Loc);
TL.setRBracketLoc(Chunk.EndLoc);
TL.setSizeExpr(static_cast<Expr*>(Chunk.Arr.NumElts));
}
void VisitFunctionTypeLoc(FunctionTypeLoc TL) {
assert(Chunk.Kind == DeclaratorChunk::Function);
TL.setLParenLoc(Chunk.Loc);
TL.setRParenLoc(Chunk.EndLoc);
const DeclaratorChunk::FunctionTypeInfo &FTI = Chunk.Fun;
for (unsigned i = 0, e = TL.getNumArgs(), tpi = 0; i != e; ++i) {
ParmVarDecl *Param = FTI.ArgInfo[i].Param.getAs<ParmVarDecl>();
TL.setArg(tpi++, Param);
}
// FIXME: exception specs
}
void VisitTypeLoc(TypeLoc TL) {
llvm_unreachable("unsupported TypeLoc kind in declarator!");
}
};
}
/// \brief Create and instantiate a TypeSourceInfo with type source information.
///
/// \param T QualType referring to the type as written in source code.
TypeSourceInfo *
Sema::GetTypeSourceInfoForDeclarator(Declarator &D, QualType T) {
TypeSourceInfo *TInfo = Context.CreateTypeSourceInfo(T);
UnqualTypeLoc CurrTL = TInfo->getTypeLoc().getUnqualifiedLoc();
for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) {
DeclaratorLocFiller(D.getTypeObject(i)).Visit(CurrTL);
CurrTL = CurrTL.getNextTypeLoc().getUnqualifiedLoc();
}
TypeSpecLocFiller(D.getDeclSpec()).Visit(CurrTL);
return TInfo;
}
/// \brief Create a LocInfoType to hold the given QualType and TypeSourceInfo.
QualType Sema::CreateLocInfoType(QualType T, TypeSourceInfo *TInfo) {
// FIXME: LocInfoTypes are "transient", only needed for passing to/from Parser
// and Sema during declaration parsing. Try deallocating/caching them when
// it's appropriate, instead of allocating them and keeping them around.
LocInfoType *LocT = (LocInfoType*)BumpAlloc.Allocate(sizeof(LocInfoType), 8);
new (LocT) LocInfoType(T, TInfo);
assert(LocT->getTypeClass() != T->getTypeClass() &&
"LocInfoType's TypeClass conflicts with an existing Type class");
return QualType(LocT, 0);
}
void LocInfoType::getAsStringInternal(std::string &Str,
const PrintingPolicy &Policy) const {
assert(false && "LocInfoType leaked into the type system; an opaque TypeTy*"
" was used directly instead of getting the QualType through"
" GetTypeFromParser");
}
/// ObjCGetTypeForMethodDefinition - Builds the type for a method definition
/// declarator
QualType Sema::ObjCGetTypeForMethodDefinition(DeclPtrTy D) {
ObjCMethodDecl *MDecl = cast<ObjCMethodDecl>(D.getAs<Decl>());
QualType T = MDecl->getResultType();
llvm::SmallVector<QualType, 16> ArgTys;
// Add the first two invisible argument types for self and _cmd.
if (MDecl->isInstanceMethod()) {
QualType selfTy = Context.getObjCInterfaceType(MDecl->getClassInterface());
selfTy = Context.getPointerType(selfTy);
ArgTys.push_back(selfTy);
} else
ArgTys.push_back(Context.getObjCIdType());
ArgTys.push_back(Context.getObjCSelType());
for (ObjCMethodDecl::param_iterator PI = MDecl->param_begin(),
E = MDecl->param_end(); PI != E; ++PI) {
QualType ArgTy = (*PI)->getType();
assert(!ArgTy.isNull() && "Couldn't parse type?");
ArgTy = adjustParameterType(ArgTy);
ArgTys.push_back(ArgTy);
}
T = Context.getFunctionType(T, &ArgTys[0], ArgTys.size(),
MDecl->isVariadic(), 0);
return T;
}
/// UnwrapSimilarPointerTypes - If T1 and T2 are pointer types that
/// may be similar (C++ 4.4), replaces T1 and T2 with the type that
/// they point to and return true. If T1 and T2 aren't pointer types
/// or pointer-to-member types, or if they are not similar at this
/// level, returns false and leaves T1 and T2 unchanged. Top-level
/// qualifiers on T1 and T2 are ignored. This function will typically
/// be called in a loop that successively "unwraps" pointer and
/// pointer-to-member types to compare them at each level.
bool Sema::UnwrapSimilarPointerTypes(QualType& T1, QualType& T2) {
const PointerType *T1PtrType = T1->getAs<PointerType>(),
*T2PtrType = T2->getAs<PointerType>();
if (T1PtrType && T2PtrType) {
T1 = T1PtrType->getPointeeType();
T2 = T2PtrType->getPointeeType();
return true;
}
const MemberPointerType *T1MPType = T1->getAs<MemberPointerType>(),
*T2MPType = T2->getAs<MemberPointerType>();
if (T1MPType && T2MPType &&
Context.getCanonicalType(T1MPType->getClass()) ==
Context.getCanonicalType(T2MPType->getClass())) {
T1 = T1MPType->getPointeeType();
T2 = T2MPType->getPointeeType();
return true;
}
return false;
}
Sema::TypeResult Sema::ActOnTypeName(Scope *S, Declarator &D) {
// C99 6.7.6: Type names have no identifier. This is already validated by
// the parser.
assert(D.getIdentifier() == 0 && "Type name should have no identifier!");
TypeSourceInfo *TInfo = 0;
TagDecl *OwnedTag = 0;
QualType T = GetTypeForDeclarator(D, S, &TInfo, &OwnedTag);
if (D.isInvalidType())
return true;
if (getLangOptions().CPlusPlus) {
// Check that there are no default arguments (C++ only).
CheckExtraCXXDefaultArguments(D);
// C++0x [dcl.type]p3:
// A type-specifier-seq shall not define a class or enumeration
// unless it appears in the type-id of an alias-declaration
// (7.1.3).
if (OwnedTag && OwnedTag->isDefinition())
Diag(OwnedTag->getLocation(), diag::err_type_defined_in_type_specifier)
<< Context.getTypeDeclType(OwnedTag);
}
if (TInfo)
T = CreateLocInfoType(T, TInfo);
return T.getAsOpaquePtr();
}
//===----------------------------------------------------------------------===//
// Type Attribute Processing
//===----------------------------------------------------------------------===//
/// HandleAddressSpaceTypeAttribute - Process an address_space attribute on the
/// specified type. The attribute contains 1 argument, the id of the address
/// space for the type.
static void HandleAddressSpaceTypeAttribute(QualType &Type,
const AttributeList &Attr, Sema &S){
// If this type is already address space qualified, reject it.
// Clause 6.7.3 - Type qualifiers: "No type shall be qualified by qualifiers
// for two or more different address spaces."
if (Type.getAddressSpace()) {
S.Diag(Attr.getLoc(), diag::err_attribute_address_multiple_qualifiers);
return;
}
// Check the attribute arguments.
if (Attr.getNumArgs() != 1) {
S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1;
return;
}
Expr *ASArgExpr = static_cast<Expr *>(Attr.getArg(0));
llvm::APSInt addrSpace(32);
if (!ASArgExpr->isIntegerConstantExpr(addrSpace, S.Context)) {
S.Diag(Attr.getLoc(), diag::err_attribute_address_space_not_int)
<< ASArgExpr->getSourceRange();
return;
}
// Bounds checking.
if (addrSpace.isSigned()) {
if (addrSpace.isNegative()) {
S.Diag(Attr.getLoc(), diag::err_attribute_address_space_negative)
<< ASArgExpr->getSourceRange();
return;
}
addrSpace.setIsSigned(false);
}
llvm::APSInt max(addrSpace.getBitWidth());
max = Qualifiers::MaxAddressSpace;
if (addrSpace > max) {
S.Diag(Attr.getLoc(), diag::err_attribute_address_space_too_high)
<< Qualifiers::MaxAddressSpace << ASArgExpr->getSourceRange();
return;
}
unsigned ASIdx = static_cast<unsigned>(addrSpace.getZExtValue());
Type = S.Context.getAddrSpaceQualType(Type, ASIdx);
}
/// HandleObjCGCTypeAttribute - Process an objc's gc attribute on the
/// specified type. The attribute contains 1 argument, weak or strong.
static void HandleObjCGCTypeAttribute(QualType &Type,
const AttributeList &Attr, Sema &S) {
if (Type.getObjCGCAttr() != Qualifiers::GCNone) {
S.Diag(Attr.getLoc(), diag::err_attribute_multiple_objc_gc);
return;
}
// Check the attribute arguments.
if (!Attr.getParameterName()) {
S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_not_string)
<< "objc_gc" << 1;
return;
}
Qualifiers::GC GCAttr;
if (Attr.getNumArgs() != 0) {
S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1;
return;
}
if (Attr.getParameterName()->isStr("weak"))
GCAttr = Qualifiers::Weak;
else if (Attr.getParameterName()->isStr("strong"))
GCAttr = Qualifiers::Strong;
else {
S.Diag(Attr.getLoc(), diag::warn_attribute_type_not_supported)
<< "objc_gc" << Attr.getParameterName();
return;
}
Type = S.Context.getObjCGCQualType(Type, GCAttr);
}
/// HandleNoReturnTypeAttribute - Process the noreturn attribute on the
/// specified type. The attribute contains 0 arguments.
static void HandleNoReturnTypeAttribute(QualType &Type,
const AttributeList &Attr, Sema &S) {
if (Attr.getNumArgs() != 0)
return;
// We only apply this to a pointer to function or a pointer to block.
if (!Type->isFunctionPointerType()
&& !Type->isBlockPointerType()
&& !Type->isFunctionType())
return;
Type = S.Context.getNoReturnType(Type);
}
/// HandleVectorSizeAttribute - this attribute is only applicable to integral
/// and float scalars, although arrays, pointers, and function return values are
/// allowed in conjunction with this construct. Aggregates with this attribute
/// are invalid, even if they are of the same size as a corresponding scalar.
/// The raw attribute should contain precisely 1 argument, the vector size for
/// the variable, measured in bytes. If curType and rawAttr are well formed,
/// this routine will return a new vector type.
static void HandleVectorSizeAttr(QualType& CurType, const AttributeList &Attr, Sema &S) {
// Check the attribute arugments.
if (Attr.getNumArgs() != 1) {
S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1;
return;
}
Expr *sizeExpr = static_cast<Expr *>(Attr.getArg(0));
llvm::APSInt vecSize(32);
if (!sizeExpr->isIntegerConstantExpr(vecSize, S.Context)) {
S.Diag(Attr.getLoc(), diag::err_attribute_argument_not_int)
<< "vector_size" << sizeExpr->getSourceRange();
return;
}
// the base type must be integer or float, and can't already be a vector.
if (CurType->isVectorType() ||
(!CurType->isIntegerType() && !CurType->isRealFloatingType())) {
S.Diag(Attr.getLoc(), diag::err_attribute_invalid_vector_type) << CurType;
return;
}
unsigned typeSize = static_cast<unsigned>(S.Context.getTypeSize(CurType));
// vecSize is specified in bytes - convert to bits.
unsigned vectorSize = static_cast<unsigned>(vecSize.getZExtValue() * 8);
// the vector size needs to be an integral multiple of the type size.
if (vectorSize % typeSize) {
S.Diag(Attr.getLoc(), diag::err_attribute_invalid_size)
<< sizeExpr->getSourceRange();
return;
}
if (vectorSize == 0) {
S.Diag(Attr.getLoc(), diag::err_attribute_zero_size)
<< sizeExpr->getSourceRange();
return;
}
// Success! Instantiate the vector type, the number of elements is > 0, and
// not required to be a power of 2, unlike GCC.
CurType = S.Context.getVectorType(CurType, vectorSize/typeSize);
}
void Sema::ProcessTypeAttributeList(QualType &Result, const AttributeList *AL) {
// Scan through and apply attributes to this type where it makes sense. Some
// attributes (such as __address_space__, __vector_size__, etc) apply to the
// type, but others can be present in the type specifiers even though they
// apply to the decl. Here we apply type attributes and ignore the rest.
for (; AL; AL = AL->getNext()) {
// If this is an attribute we can handle, do so now, otherwise, add it to
// the LeftOverAttrs list for rechaining.
switch (AL->getKind()) {
default: break;
case AttributeList::AT_address_space:
HandleAddressSpaceTypeAttribute(Result, *AL, *this);
break;
case AttributeList::AT_objc_gc:
HandleObjCGCTypeAttribute(Result, *AL, *this);
break;
case AttributeList::AT_noreturn:
HandleNoReturnTypeAttribute(Result, *AL, *this);
break;
case AttributeList::AT_vector_size:
HandleVectorSizeAttr(Result, *AL, *this);
break;
}
}
}
/// @brief Ensure that the type T is a complete type.
///
/// This routine checks whether the type @p T is complete in any
/// context where a complete type is required. If @p T is a complete
/// type, returns false. If @p T is a class template specialization,
/// this routine then attempts to perform class template
/// instantiation. If instantiation fails, or if @p T is incomplete
/// and cannot be completed, issues the diagnostic @p diag (giving it
/// the type @p T) and returns true.
///
/// @param Loc The location in the source that the incomplete type
/// diagnostic should refer to.
///
/// @param T The type that this routine is examining for completeness.
///
/// @param PD The partial diagnostic that will be printed out if T is not a
/// complete type.
///
/// @returns @c true if @p T is incomplete and a diagnostic was emitted,
/// @c false otherwise.
bool Sema::RequireCompleteType(SourceLocation Loc, QualType T,
const PartialDiagnostic &PD,
std::pair<SourceLocation,
PartialDiagnostic> Note) {
unsigned diag = PD.getDiagID();
// FIXME: Add this assertion to make sure we always get instantiation points.
// assert(!Loc.isInvalid() && "Invalid location in RequireCompleteType");
// FIXME: Add this assertion to help us flush out problems with
// checking for dependent types and type-dependent expressions.
//
// assert(!T->isDependentType() &&
// "Can't ask whether a dependent type is complete");
// If we have a complete type, we're done.
if (!T->isIncompleteType())
return false;
// If we have a class template specialization or a class member of a
// class template specialization, or an array with known size of such,
// try to instantiate it.
QualType MaybeTemplate = T;
if (const ConstantArrayType *Array = Context.getAsConstantArrayType(T))
MaybeTemplate = Array->getElementType();
if (const RecordType *Record = MaybeTemplate->getAs<RecordType>()) {
if (ClassTemplateSpecializationDecl *ClassTemplateSpec
= dyn_cast<ClassTemplateSpecializationDecl>(Record->getDecl())) {
if (ClassTemplateSpec->getSpecializationKind() == TSK_Undeclared)
return InstantiateClassTemplateSpecialization(Loc, ClassTemplateSpec,
TSK_ImplicitInstantiation,
/*Complain=*/diag != 0);
} else if (CXXRecordDecl *Rec
= dyn_cast<CXXRecordDecl>(Record->getDecl())) {
if (CXXRecordDecl *Pattern = Rec->getInstantiatedFromMemberClass()) {
MemberSpecializationInfo *MSInfo = Rec->getMemberSpecializationInfo();
assert(MSInfo && "Missing member specialization information?");
// This record was instantiated from a class within a template.
if (MSInfo->getTemplateSpecializationKind()
!= TSK_ExplicitSpecialization)
return InstantiateClass(Loc, Rec, Pattern,
getTemplateInstantiationArgs(Rec),
TSK_ImplicitInstantiation,
/*Complain=*/diag != 0);
}
}
}
if (diag == 0)
return true;
// We have an incomplete type. Produce a diagnostic.
Diag(Loc, PD) << T;
// If we have a note, produce it.
if (!Note.first.isInvalid())
Diag(Note.first, Note.second);
// If the type was a forward declaration of a class/struct/union
// type, produce
const TagType *Tag = 0;
if (const RecordType *Record = T->getAs<RecordType>())
Tag = Record;
else if (const EnumType *Enum = T->getAs<EnumType>())
Tag = Enum;
if (Tag && !Tag->getDecl()->isInvalidDecl())
Diag(Tag->getDecl()->getLocation(),
Tag->isBeingDefined() ? diag::note_type_being_defined
: diag::note_forward_declaration)
<< QualType(Tag, 0);
return true;
}
/// \brief Retrieve a version of the type 'T' that is qualified by the
/// nested-name-specifier contained in SS.
QualType Sema::getQualifiedNameType(const CXXScopeSpec &SS, QualType T) {
if (!SS.isSet() || SS.isInvalid() || T.isNull())
return T;
NestedNameSpecifier *NNS
= static_cast<NestedNameSpecifier *>(SS.getScopeRep());
return Context.getQualifiedNameType(NNS, T);
}
QualType Sema::BuildTypeofExprType(Expr *E) {
return Context.getTypeOfExprType(E);
}
QualType Sema::BuildDecltypeType(Expr *E) {
if (E->getType() == Context.OverloadTy) {
Diag(E->getLocStart(),
diag::err_cannot_determine_declared_type_of_overloaded_function);
return QualType();
}
return Context.getDecltypeType(E);
}
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