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clang-1/Sema/SemaType.cpp

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//===--- SemaType.cpp - Semantic Analysis for Types -----------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by Chris Lattner and 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/Decl.h"
#include "clang/Parse/DeclSpec.h"
#include "clang/Lex/IdentifierTable.h"
#include "clang/Basic/LangOptions.h"
using namespace clang;
/// ConvertDeclSpecToType - Convert the specified declspec to the appropriate
/// type object. This returns null on error.
static QualType ConvertDeclSpecToType(const DeclSpec &DS, ASTContext &Ctx) {
// FIXME: Should move the logic from DeclSpec::Finish to here for validity
// checking.
switch (DS.getTypeSpecType()) {
default: return QualType(); // FIXME: Handle unimp cases!
case DeclSpec::TST_void: return Ctx.VoidTy;
case DeclSpec::TST_char:
if (DS.getTypeSpecSign() == DeclSpec::TSS_unspecified)
return Ctx.CharTy;
else if (DS.getTypeSpecSign() == DeclSpec::TSS_signed)
return Ctx.SignedCharTy;
else {
assert(DS.getTypeSpecSign() == DeclSpec::TSS_unsigned &&
"Unknown TSS value");
return Ctx.UnsignedCharTy;
}
case DeclSpec::TST_unspecified: // Unspecific typespec defaults to int.
case DeclSpec::TST_int: {
QualType Result;
if (DS.getTypeSpecSign() != DeclSpec::TSS_unsigned) {
switch (DS.getTypeSpecWidth()) {
case DeclSpec::TSW_unspecified: Result = Ctx.IntTy; break;
case DeclSpec::TSW_short: Result = Ctx.ShortTy; break;
case DeclSpec::TSW_long: Result = Ctx.LongTy; break;
case DeclSpec::TSW_longlong: Result = Ctx.LongLongTy; break;
}
} else {
switch (DS.getTypeSpecWidth()) {
case DeclSpec::TSW_unspecified: Result = Ctx.UnsignedIntTy; break;
case DeclSpec::TSW_short: Result = Ctx.UnsignedShortTy; break;
case DeclSpec::TSW_long: Result = Ctx.UnsignedLongTy; break;
case DeclSpec::TSW_longlong: Result = Ctx.UnsignedLongLongTy; break;
}
}
// Handle complex integer types.
if (DS.getTypeSpecComplex() == DeclSpec::TSC_unspecified)
return Result;
assert(DS.getTypeSpecComplex() == DeclSpec::TSC_complex &&
"FIXME: imaginary types not supported yet!");
return Ctx.getComplexType(Result);
}
case DeclSpec::TST_float:
if (DS.getTypeSpecComplex() == DeclSpec::TSC_unspecified)
return Ctx.FloatTy;
assert(DS.getTypeSpecComplex() == DeclSpec::TSC_complex &&
"FIXME: imaginary types not supported yet!");
return Ctx.getComplexType(Ctx.FloatTy);
case DeclSpec::TST_double: {
bool isLong = DS.getTypeSpecWidth() == DeclSpec::TSW_long;
QualType T = isLong ? Ctx.LongDoubleTy : Ctx.DoubleTy;
if (DS.getTypeSpecComplex() == DeclSpec::TSC_unspecified)
return T;
assert(DS.getTypeSpecComplex() == DeclSpec::TSC_complex &&
"FIXME: imaginary types not supported yet!");
return Ctx.getComplexType(T);
}
case DeclSpec::TST_bool: // _Bool or bool
return Ctx.BoolTy;
case DeclSpec::TST_decimal32: // _Decimal32
case DeclSpec::TST_decimal64: // _Decimal64
case DeclSpec::TST_decimal128: // _Decimal128
assert(0 && "FIXME: GNU decimal extensions not supported yet!");
case DeclSpec::TST_enum:
case DeclSpec::TST_union:
case DeclSpec::TST_struct: {
Decl *D = static_cast<Decl *>(DS.getTypeRep());
assert(D && "Didn't get a decl for a enum/union/struct?");
assert(DS.getTypeSpecWidth() == 0 && DS.getTypeSpecComplex() == 0 &&
DS.getTypeSpecSign() == 0 &&
"Can't handle qualifiers on typedef names yet!");
// TypeQuals handled by caller.
return Ctx.getTagDeclType(cast<TagDecl>(D));
}
case DeclSpec::TST_typedef: {
Decl *D = static_cast<Decl *>(DS.getTypeRep());
assert(D && "Didn't get a decl for a typedef?");
assert(DS.getTypeSpecWidth() == 0 && DS.getTypeSpecComplex() == 0 &&
DS.getTypeSpecSign() == 0 &&
"Can't handle qualifiers on typedef names yet!");
// TypeQuals handled by caller.
return Ctx.getTypedefType(cast<TypedefDecl>(D));
}
case DeclSpec::TST_typeofType: {
QualType T = QualType::getFromOpaquePtr(DS.getTypeRep());
assert(!T.isNull() && "Didn't get a type for typeof?");
// TypeQuals handled by caller.
return Ctx.getTypeOfType(T);
}
case DeclSpec::TST_typeofExpr: {
Expr *E = static_cast<Expr *>(DS.getTypeRep());
assert(E && "Didn't get an expression for typeof?");
// TypeQuals handled by caller.
return Ctx.getTypeOfExpr(E);
}
}
}
/// GetTypeForDeclarator - Convert the type for the specified declarator to Type
/// instances.
QualType Sema::GetTypeForDeclarator(Declarator &D, Scope *S) {
// long long is a C99 feature.
if (!getLangOptions().C99 && !getLangOptions().CPlusPlus0x &&
D.getDeclSpec().getTypeSpecWidth() == DeclSpec::TSW_longlong)
Diag(D.getDeclSpec().getTypeSpecWidthLoc(), diag::ext_longlong);
QualType T = ConvertDeclSpecToType(D.getDeclSpec(), Context);
// Apply const/volatile/restrict qualifiers to T.
T = T.getQualifiedType(D.getDeclSpec().getTypeQualifiers());
// 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) {
const DeclaratorChunk &DeclType = D.getTypeObject(e-i-1);
switch (DeclType.Kind) {
default: assert(0 && "Unknown decltype!");
case DeclaratorChunk::Pointer:
if (T->isReferenceType()) {
// C++ 8.3.2p4: There shall be no ... pointers to references ...
Diag(D.getIdentifierLoc(), diag::err_illegal_decl_pointer_to_reference,
D.getIdentifier()->getName());
D.setInvalidType(true);
T = Context.IntTy;
}
// Apply the pointer typequals to the pointer object.
T = Context.getPointerType(T).getQualifiedType(DeclType.Ptr.TypeQuals);
break;
case DeclaratorChunk::Reference:
if (const ReferenceType *RT = T->getAsReferenceType()) {
// C++ 8.3.2p4: There shall be no references to references ...
Diag(D.getIdentifierLoc(),
diag::err_illegal_decl_reference_to_reference,
D.getIdentifier()->getName());
D.setInvalidType(true);
T = RT->getReferenceeType();
}
T = Context.getReferenceType(T);
break;
case DeclaratorChunk::Array: {
const 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;
// 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]())
if (T->isIncompleteType()) {
Diag(D.getIdentifierLoc(), diag::err_illegal_decl_array_incomplete_type,
T.getAsString());
T = Context.IntTy;
D.setInvalidType(true);
} else if (T->isFunctionType()) {
Diag(D.getIdentifierLoc(), diag::err_illegal_decl_array_of_functions,
D.getIdentifier()->getName());
T = Context.getPointerType(T);
D.setInvalidType(true);
} else if (const ReferenceType *RT = T->getAsReferenceType()) {
// C++ 8.3.2p4: There shall be no ... arrays of references ...
Diag(D.getIdentifierLoc(), diag::err_illegal_decl_array_of_references,
D.getIdentifier()->getName());
T = RT->getReferenceeType();
D.setInvalidType(true);
} else if (const RecordType *EltTy = T->getAsRecordType()) {
// If the element type is a struct or union that contains a variadic
// array, reject it: C99 6.7.2.1p2.
if (EltTy->getDecl()->hasFlexibleArrayMember()) {
Diag(DeclType.Loc, diag::err_flexible_array_in_array,
T.getAsString());
T = Context.IntTy;
D.setInvalidType(true);
}
}
T = Context.getArrayType(T, ASM, ATI.TypeQuals, ArraySize);
// If this is not C99, extwarn about VLA's and C99 array size modifiers.
if (!getLangOptions().C99 &&
(ASM != ArrayType::Normal ||
(ArraySize && !ArraySize->isIntegerConstantExpr(Context))))
Diag(D.getIdentifierLoc(), diag::ext_vla);
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;
if (!FTI.hasPrototype) {
// Simple void foo(), where the incoming T is the result type.
T = Context.getFunctionTypeNoProto(T);
// C99 6.7.5.3p3: Reject int(x,y,z) when it's not a function definition.
if (FTI.NumArgs != 0)
Diag(FTI.ArgInfo[0].IdentLoc, diag::err_ident_list_in_fn_declaration);
} 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) {
QualType ArgTy = QualType::getFromOpaquePtr(FTI.ArgInfo[i].TypeInfo);
assert(!ArgTy.isNull() && "Couldn't parse 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 FunctionTypeProto 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;
FTI.ArgInfo[i].TypeInfo = ArgTy.getAsOpaquePtr();
} 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;
FTI.ArgInfo[i].TypeInfo = ArgTy.getAsOpaquePtr();
} else {
// Reject, but continue to parse 'float(const void)'.
if (ArgTy.getQualifiers())
Diag(DeclType.Loc, diag::err_void_param_qualified);
// Do not add 'void' to the ArgTys list.
break;
}
}
ArgTys.push_back(ArgTy);
}
T = Context.getFunctionType(T, &ArgTys[0], ArgTys.size(),
FTI.isVariadic);
}
break;
}
}
return T;
}
Sema::TypeResult Sema::ParseTypeName(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!");
QualType T = GetTypeForDeclarator(D, S);
assert(!T.isNull() && "GetTypeForDeclarator() returned null type");
// In this context, we *do not* check D.getInvalidType(). If the declarator
// type was invalid, GetTypeForDeclarator() still returns a "valid" type,
// though it will not reflect the user specified type.
return T.getAsOpaquePtr();
}
// Called from Parser::ParseParenDeclarator().
Sema::TypeResult Sema::ParseParamDeclaratorType(Scope *S, Declarator &D) {
// Note: parameters have identifiers, but we don't care about them here, we
// just want the type converted.
QualType T = GetTypeForDeclarator(D, S);
assert(!T.isNull() && "GetTypeForDeclarator() returned null type");
// In this context, we *do not* check D.getInvalidType(). If the declarator
// type was invalid, GetTypeForDeclarator() still returns a "valid" type,
// though it will not reflect the user specified type.
return T.getAsOpaquePtr();
}
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