blob: 6ff4adf748ecbb10e62f31debfb1887a2793bc8f [file] [log] [blame]
//===--- 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 "clang/Sema/SemaInternal.h"
#include "TypeLocBuilder.h"
#include "clang/AST/ASTConsumer.h"
#include "clang/AST/ASTContext.h"
#include "clang/AST/ASTMutationListener.h"
#include "clang/AST/CXXInheritance.h"
#include "clang/AST/DeclObjC.h"
#include "clang/AST/DeclTemplate.h"
#include "clang/AST/Expr.h"
#include "clang/AST/TypeLoc.h"
#include "clang/AST/TypeLocVisitor.h"
#include "clang/Lex/Preprocessor.h"
#include "clang/Basic/PartialDiagnostic.h"
#include "clang/Basic/TargetInfo.h"
#include "clang/Lex/Preprocessor.h"
#include "clang/Sema/DeclSpec.h"
#include "clang/Sema/DelayedDiagnostic.h"
#include "clang/Sema/Lookup.h"
#include "clang/Sema/ScopeInfo.h"
#include "clang/Sema/Template.h"
#include "llvm/ADT/SmallPtrSet.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/Support/ErrorHandling.h"
using namespace clang;
enum TypeDiagSelector {
TDS_Function,
TDS_Pointer,
TDS_ObjCObjOrBlock
};
/// 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;
}
/// diagnoseBadTypeAttribute - Diagnoses a type attribute which
/// doesn't apply to the given type.
static void diagnoseBadTypeAttribute(Sema &S, const AttributeList &attr,
QualType type) {
TypeDiagSelector WhichType;
bool useExpansionLoc = true;
switch (attr.getKind()) {
case AttributeList::AT_ObjCGC: WhichType = TDS_Pointer; break;
case AttributeList::AT_ObjCOwnership: WhichType = TDS_ObjCObjOrBlock; break;
default:
// Assume everything else was a function attribute.
WhichType = TDS_Function;
useExpansionLoc = false;
break;
}
SourceLocation loc = attr.getLoc();
StringRef name = attr.getName()->getName();
// The GC attributes are usually written with macros; special-case them.
IdentifierInfo *II = attr.isArgIdent(0) ? attr.getArgAsIdent(0)->Ident
: nullptr;
if (useExpansionLoc && loc.isMacroID() && II) {
if (II->isStr("strong")) {
if (S.findMacroSpelling(loc, "__strong")) name = "__strong";
} else if (II->isStr("weak")) {
if (S.findMacroSpelling(loc, "__weak")) name = "__weak";
}
}
S.Diag(loc, diag::warn_type_attribute_wrong_type) << name << WhichType
<< type;
}
// objc_gc applies to Objective-C pointers or, otherwise, to the
// smallest available pointer type (i.e. 'void*' in 'void**').
#define OBJC_POINTER_TYPE_ATTRS_CASELIST \
case AttributeList::AT_ObjCGC: \
case AttributeList::AT_ObjCOwnership
// Calling convention attributes.
#define CALLING_CONV_ATTRS_CASELIST \
case AttributeList::AT_CDecl: \
case AttributeList::AT_FastCall: \
case AttributeList::AT_StdCall: \
case AttributeList::AT_ThisCall: \
case AttributeList::AT_Pascal: \
case AttributeList::AT_SwiftCall: \
case AttributeList::AT_VectorCall: \
case AttributeList::AT_MSABI: \
case AttributeList::AT_SysVABI: \
case AttributeList::AT_Pcs: \
case AttributeList::AT_IntelOclBicc: \
case AttributeList::AT_PreserveMost: \
case AttributeList::AT_PreserveAll
// Function type attributes.
#define FUNCTION_TYPE_ATTRS_CASELIST \
case AttributeList::AT_NoReturn: \
case AttributeList::AT_Regparm: \
CALLING_CONV_ATTRS_CASELIST
// Microsoft-specific type qualifiers.
#define MS_TYPE_ATTRS_CASELIST \
case AttributeList::AT_Ptr32: \
case AttributeList::AT_Ptr64: \
case AttributeList::AT_SPtr: \
case AttributeList::AT_UPtr
// Nullability qualifiers.
#define NULLABILITY_TYPE_ATTRS_CASELIST \
case AttributeList::AT_TypeNonNull: \
case AttributeList::AT_TypeNullable: \
case AttributeList::AT_TypeNullUnspecified
namespace {
/// An object which stores processing state for the entire
/// GetTypeForDeclarator process.
class TypeProcessingState {
Sema &sema;
/// The declarator being processed.
Declarator &declarator;
/// The index of the declarator chunk we're currently processing.
/// May be the total number of valid chunks, indicating the
/// DeclSpec.
unsigned chunkIndex;
/// Whether there are non-trivial modifications to the decl spec.
bool trivial;
/// Whether we saved the attributes in the decl spec.
bool hasSavedAttrs;
/// The original set of attributes on the DeclSpec.
SmallVector<AttributeList*, 2> savedAttrs;
/// A list of attributes to diagnose the uselessness of when the
/// processing is complete.
SmallVector<AttributeList*, 2> ignoredTypeAttrs;
public:
TypeProcessingState(Sema &sema, Declarator &declarator)
: sema(sema), declarator(declarator),
chunkIndex(declarator.getNumTypeObjects()),
trivial(true), hasSavedAttrs(false) {}
Sema &getSema() const {
return sema;
}
Declarator &getDeclarator() const {
return declarator;
}
bool isProcessingDeclSpec() const {
return chunkIndex == declarator.getNumTypeObjects();
}
unsigned getCurrentChunkIndex() const {
return chunkIndex;
}
void setCurrentChunkIndex(unsigned idx) {
assert(idx <= declarator.getNumTypeObjects());
chunkIndex = idx;
}
AttributeList *&getCurrentAttrListRef() const {
if (isProcessingDeclSpec())
return getMutableDeclSpec().getAttributes().getListRef();
return declarator.getTypeObject(chunkIndex).getAttrListRef();
}
/// Save the current set of attributes on the DeclSpec.
void saveDeclSpecAttrs() {
// Don't try to save them multiple times.
if (hasSavedAttrs) return;
DeclSpec &spec = getMutableDeclSpec();
for (AttributeList *attr = spec.getAttributes().getList(); attr;
attr = attr->getNext())
savedAttrs.push_back(attr);
trivial &= savedAttrs.empty();
hasSavedAttrs = true;
}
/// Record that we had nowhere to put the given type attribute.
/// We will diagnose such attributes later.
void addIgnoredTypeAttr(AttributeList &attr) {
ignoredTypeAttrs.push_back(&attr);
}
/// Diagnose all the ignored type attributes, given that the
/// declarator worked out to the given type.
void diagnoseIgnoredTypeAttrs(QualType type) const {
for (auto *Attr : ignoredTypeAttrs)
diagnoseBadTypeAttribute(getSema(), *Attr, type);
}
~TypeProcessingState() {
if (trivial) return;
restoreDeclSpecAttrs();
}
private:
DeclSpec &getMutableDeclSpec() const {
return const_cast<DeclSpec&>(declarator.getDeclSpec());
}
void restoreDeclSpecAttrs() {
assert(hasSavedAttrs);
if (savedAttrs.empty()) {
getMutableDeclSpec().getAttributes().set(nullptr);
return;
}
getMutableDeclSpec().getAttributes().set(savedAttrs[0]);
for (unsigned i = 0, e = savedAttrs.size() - 1; i != e; ++i)
savedAttrs[i]->setNext(savedAttrs[i+1]);
savedAttrs.back()->setNext(nullptr);
}
};
}
static void spliceAttrIntoList(AttributeList &attr, AttributeList *&head) {
attr.setNext(head);
head = &attr;
}
static void spliceAttrOutOfList(AttributeList &attr, AttributeList *&head) {
if (head == &attr) {
head = attr.getNext();
return;
}
AttributeList *cur = head;
while (true) {
assert(cur && cur->getNext() && "ran out of attrs?");
if (cur->getNext() == &attr) {
cur->setNext(attr.getNext());
return;
}
cur = cur->getNext();
}
}
static void moveAttrFromListToList(AttributeList &attr,
AttributeList *&fromList,
AttributeList *&toList) {
spliceAttrOutOfList(attr, fromList);
spliceAttrIntoList(attr, toList);
}
/// The location of a type attribute.
enum TypeAttrLocation {
/// The attribute is in the decl-specifier-seq.
TAL_DeclSpec,
/// The attribute is part of a DeclaratorChunk.
TAL_DeclChunk,
/// The attribute is immediately after the declaration's name.
TAL_DeclName
};
static void processTypeAttrs(TypeProcessingState &state,
QualType &type, TypeAttrLocation TAL,
AttributeList *attrs);
static bool handleFunctionTypeAttr(TypeProcessingState &state,
AttributeList &attr,
QualType &type);
static bool handleMSPointerTypeQualifierAttr(TypeProcessingState &state,
AttributeList &attr,
QualType &type);
static bool handleObjCGCTypeAttr(TypeProcessingState &state,
AttributeList &attr, QualType &type);
static bool handleObjCOwnershipTypeAttr(TypeProcessingState &state,
AttributeList &attr, QualType &type);
static bool handleObjCPointerTypeAttr(TypeProcessingState &state,
AttributeList &attr, QualType &type) {
if (attr.getKind() == AttributeList::AT_ObjCGC)
return handleObjCGCTypeAttr(state, attr, type);
assert(attr.getKind() == AttributeList::AT_ObjCOwnership);
return handleObjCOwnershipTypeAttr(state, attr, type);
}
/// Given the index of a declarator chunk, check whether that chunk
/// directly specifies the return type of a function and, if so, find
/// an appropriate place for it.
///
/// \param i - a notional index which the search will start
/// immediately inside
///
/// \param onlyBlockPointers Whether we should only look into block
/// pointer types (vs. all pointer types).
static DeclaratorChunk *maybeMovePastReturnType(Declarator &declarator,
unsigned i,
bool onlyBlockPointers) {
assert(i <= declarator.getNumTypeObjects());
DeclaratorChunk *result = nullptr;
// First, look inwards past parens for a function declarator.
for (; i != 0; --i) {
DeclaratorChunk &fnChunk = declarator.getTypeObject(i-1);
switch (fnChunk.Kind) {
case DeclaratorChunk::Paren:
continue;
// If we find anything except a function, bail out.
case DeclaratorChunk::Pointer:
case DeclaratorChunk::BlockPointer:
case DeclaratorChunk::Array:
case DeclaratorChunk::Reference:
case DeclaratorChunk::MemberPointer:
case DeclaratorChunk::Pipe:
return result;
// If we do find a function declarator, scan inwards from that,
// looking for a (block-)pointer declarator.
case DeclaratorChunk::Function:
for (--i; i != 0; --i) {
DeclaratorChunk &ptrChunk = declarator.getTypeObject(i-1);
switch (ptrChunk.Kind) {
case DeclaratorChunk::Paren:
case DeclaratorChunk::Array:
case DeclaratorChunk::Function:
case DeclaratorChunk::Reference:
case DeclaratorChunk::Pipe:
continue;
case DeclaratorChunk::MemberPointer:
case DeclaratorChunk::Pointer:
if (onlyBlockPointers)
continue;
// fallthrough
case DeclaratorChunk::BlockPointer:
result = &ptrChunk;
goto continue_outer;
}
llvm_unreachable("bad declarator chunk kind");
}
// If we run out of declarators doing that, we're done.
return result;
}
llvm_unreachable("bad declarator chunk kind");
// Okay, reconsider from our new point.
continue_outer: ;
}
// Ran out of chunks, bail out.
return result;
}
/// Given that an objc_gc attribute was written somewhere on a
/// declaration *other* than on the declarator itself (for which, use
/// distributeObjCPointerTypeAttrFromDeclarator), and given that it
/// didn't apply in whatever position it was written in, try to move
/// it to a more appropriate position.
static void distributeObjCPointerTypeAttr(TypeProcessingState &state,
AttributeList &attr,
QualType type) {
Declarator &declarator = state.getDeclarator();
// Move it to the outermost normal or block pointer declarator.
for (unsigned i = state.getCurrentChunkIndex(); i != 0; --i) {
DeclaratorChunk &chunk = declarator.getTypeObject(i-1);
switch (chunk.Kind) {
case DeclaratorChunk::Pointer:
case DeclaratorChunk::BlockPointer: {
// But don't move an ARC ownership attribute to the return type
// of a block.
DeclaratorChunk *destChunk = nullptr;
if (state.isProcessingDeclSpec() &&
attr.getKind() == AttributeList::AT_ObjCOwnership)
destChunk = maybeMovePastReturnType(declarator, i - 1,
/*onlyBlockPointers=*/true);
if (!destChunk) destChunk = &chunk;
moveAttrFromListToList(attr, state.getCurrentAttrListRef(),
destChunk->getAttrListRef());
return;
}
case DeclaratorChunk::Paren:
case DeclaratorChunk::Array:
continue;
// We may be starting at the return type of a block.
case DeclaratorChunk::Function:
if (state.isProcessingDeclSpec() &&
attr.getKind() == AttributeList::AT_ObjCOwnership) {
if (DeclaratorChunk *dest = maybeMovePastReturnType(
declarator, i,
/*onlyBlockPointers=*/true)) {
moveAttrFromListToList(attr, state.getCurrentAttrListRef(),
dest->getAttrListRef());
return;
}
}
goto error;
// Don't walk through these.
case DeclaratorChunk::Reference:
case DeclaratorChunk::MemberPointer:
case DeclaratorChunk::Pipe:
goto error;
}
}
error:
diagnoseBadTypeAttribute(state.getSema(), attr, type);
}
/// Distribute an objc_gc type attribute that was written on the
/// declarator.
static void
distributeObjCPointerTypeAttrFromDeclarator(TypeProcessingState &state,
AttributeList &attr,
QualType &declSpecType) {
Declarator &declarator = state.getDeclarator();
// objc_gc goes on the innermost pointer to something that's not a
// pointer.
unsigned innermost = -1U;
bool considerDeclSpec = true;
for (unsigned i = 0, e = declarator.getNumTypeObjects(); i != e; ++i) {
DeclaratorChunk &chunk = declarator.getTypeObject(i);
switch (chunk.Kind) {
case DeclaratorChunk::Pointer:
case DeclaratorChunk::BlockPointer:
innermost = i;
continue;
case DeclaratorChunk::Reference:
case DeclaratorChunk::MemberPointer:
case DeclaratorChunk::Paren:
case DeclaratorChunk::Array:
case DeclaratorChunk::Pipe:
continue;
case DeclaratorChunk::Function:
considerDeclSpec = false;
goto done;
}
}
done:
// That might actually be the decl spec if we weren't blocked by
// anything in the declarator.
if (considerDeclSpec) {
if (handleObjCPointerTypeAttr(state, attr, declSpecType)) {
// Splice the attribute into the decl spec. Prevents the
// attribute from being applied multiple times and gives
// the source-location-filler something to work with.
state.saveDeclSpecAttrs();
moveAttrFromListToList(attr, declarator.getAttrListRef(),
declarator.getMutableDeclSpec().getAttributes().getListRef());
return;
}
}
// Otherwise, if we found an appropriate chunk, splice the attribute
// into it.
if (innermost != -1U) {
moveAttrFromListToList(attr, declarator.getAttrListRef(),
declarator.getTypeObject(innermost).getAttrListRef());
return;
}
// Otherwise, diagnose when we're done building the type.
spliceAttrOutOfList(attr, declarator.getAttrListRef());
state.addIgnoredTypeAttr(attr);
}
/// A function type attribute was written somewhere in a declaration
/// *other* than on the declarator itself or in the decl spec. Given
/// that it didn't apply in whatever position it was written in, try
/// to move it to a more appropriate position.
static void distributeFunctionTypeAttr(TypeProcessingState &state,
AttributeList &attr,
QualType type) {
Declarator &declarator = state.getDeclarator();
// Try to push the attribute from the return type of a function to
// the function itself.
for (unsigned i = state.getCurrentChunkIndex(); i != 0; --i) {
DeclaratorChunk &chunk = declarator.getTypeObject(i-1);
switch (chunk.Kind) {
case DeclaratorChunk::Function:
moveAttrFromListToList(attr, state.getCurrentAttrListRef(),
chunk.getAttrListRef());
return;
case DeclaratorChunk::Paren:
case DeclaratorChunk::Pointer:
case DeclaratorChunk::BlockPointer:
case DeclaratorChunk::Array:
case DeclaratorChunk::Reference:
case DeclaratorChunk::MemberPointer:
case DeclaratorChunk::Pipe:
continue;
}
}
diagnoseBadTypeAttribute(state.getSema(), attr, type);
}
/// Try to distribute a function type attribute to the innermost
/// function chunk or type. Returns true if the attribute was
/// distributed, false if no location was found.
static bool
distributeFunctionTypeAttrToInnermost(TypeProcessingState &state,
AttributeList &attr,
AttributeList *&attrList,
QualType &declSpecType) {
Declarator &declarator = state.getDeclarator();
// Put it on the innermost function chunk, if there is one.
for (unsigned i = 0, e = declarator.getNumTypeObjects(); i != e; ++i) {
DeclaratorChunk &chunk = declarator.getTypeObject(i);
if (chunk.Kind != DeclaratorChunk::Function) continue;
moveAttrFromListToList(attr, attrList, chunk.getAttrListRef());
return true;
}
return handleFunctionTypeAttr(state, attr, declSpecType);
}
/// A function type attribute was written in the decl spec. Try to
/// apply it somewhere.
static void
distributeFunctionTypeAttrFromDeclSpec(TypeProcessingState &state,
AttributeList &attr,
QualType &declSpecType) {
state.saveDeclSpecAttrs();
// C++11 attributes before the decl specifiers actually appertain to
// the declarators. Move them straight there. We don't support the
// 'put them wherever you like' semantics we allow for GNU attributes.
if (attr.isCXX11Attribute()) {
moveAttrFromListToList(attr, state.getCurrentAttrListRef(),
state.getDeclarator().getAttrListRef());
return;
}
// Try to distribute to the innermost.
if (distributeFunctionTypeAttrToInnermost(state, attr,
state.getCurrentAttrListRef(),
declSpecType))
return;
// If that failed, diagnose the bad attribute when the declarator is
// fully built.
state.addIgnoredTypeAttr(attr);
}
/// A function type attribute was written on the declarator. Try to
/// apply it somewhere.
static void
distributeFunctionTypeAttrFromDeclarator(TypeProcessingState &state,
AttributeList &attr,
QualType &declSpecType) {
Declarator &declarator = state.getDeclarator();
// Try to distribute to the innermost.
if (distributeFunctionTypeAttrToInnermost(state, attr,
declarator.getAttrListRef(),
declSpecType))
return;
// If that failed, diagnose the bad attribute when the declarator is
// fully built.
spliceAttrOutOfList(attr, declarator.getAttrListRef());
state.addIgnoredTypeAttr(attr);
}
/// \brief Given that there are attributes written on the declarator
/// itself, try to distribute any type attributes to the appropriate
/// declarator chunk.
///
/// These are attributes like the following:
/// int f ATTR;
/// int (f ATTR)();
/// but not necessarily this:
/// int f() ATTR;
static void distributeTypeAttrsFromDeclarator(TypeProcessingState &state,
QualType &declSpecType) {
// Collect all the type attributes from the declarator itself.
assert(state.getDeclarator().getAttributes() && "declarator has no attrs!");
AttributeList *attr = state.getDeclarator().getAttributes();
AttributeList *next;
do {
next = attr->getNext();
// Do not distribute C++11 attributes. They have strict rules for what
// they appertain to.
if (attr->isCXX11Attribute())
continue;
switch (attr->getKind()) {
OBJC_POINTER_TYPE_ATTRS_CASELIST:
distributeObjCPointerTypeAttrFromDeclarator(state, *attr, declSpecType);
break;
case AttributeList::AT_NSReturnsRetained:
if (!state.getSema().getLangOpts().ObjCAutoRefCount)
break;
// fallthrough
FUNCTION_TYPE_ATTRS_CASELIST:
distributeFunctionTypeAttrFromDeclarator(state, *attr, declSpecType);
break;
MS_TYPE_ATTRS_CASELIST:
// Microsoft type attributes cannot go after the declarator-id.
continue;
NULLABILITY_TYPE_ATTRS_CASELIST:
// Nullability specifiers cannot go after the declarator-id.
// Objective-C __kindof does not get distributed.
case AttributeList::AT_ObjCKindOf:
continue;
default:
break;
}
} while ((attr = next));
}
/// Add a synthetic '()' to a block-literal declarator if it is
/// required, given the return type.
static void maybeSynthesizeBlockSignature(TypeProcessingState &state,
QualType declSpecType) {
Declarator &declarator = state.getDeclarator();
// First, check whether the declarator would produce a function,
// i.e. whether the innermost semantic chunk is a function.
if (declarator.isFunctionDeclarator()) {
// If so, make that declarator a prototyped declarator.
declarator.getFunctionTypeInfo().hasPrototype = true;
return;
}
// If there are any type objects, the type as written won't name a
// function, regardless of the decl spec type. This is because a
// block signature declarator is always an abstract-declarator, and
// abstract-declarators can't just be parentheses chunks. Therefore
// we need to build a function chunk unless there are no type
// objects and the decl spec type is a function.
if (!declarator.getNumTypeObjects() && declSpecType->isFunctionType())
return;
// Note that there *are* cases with invalid declarators where
// declarators consist solely of parentheses. In general, these
// occur only in failed efforts to make function declarators, so
// faking up the function chunk is still the right thing to do.
// Otherwise, we need to fake up a function declarator.
SourceLocation loc = declarator.getLocStart();
// ...and *prepend* it to the declarator.
SourceLocation NoLoc;
declarator.AddInnermostTypeInfo(DeclaratorChunk::getFunction(
/*HasProto=*/true,
/*IsAmbiguous=*/false,
/*LParenLoc=*/NoLoc,
/*ArgInfo=*/nullptr,
/*NumArgs=*/0,
/*EllipsisLoc=*/NoLoc,
/*RParenLoc=*/NoLoc,
/*TypeQuals=*/0,
/*RefQualifierIsLvalueRef=*/true,
/*RefQualifierLoc=*/NoLoc,
/*ConstQualifierLoc=*/NoLoc,
/*VolatileQualifierLoc=*/NoLoc,
/*RestrictQualifierLoc=*/NoLoc,
/*MutableLoc=*/NoLoc, EST_None,
/*ESpecRange=*/SourceRange(),
/*Exceptions=*/nullptr,
/*ExceptionRanges=*/nullptr,
/*NumExceptions=*/0,
/*NoexceptExpr=*/nullptr,
/*ExceptionSpecTokens=*/nullptr,
loc, loc, declarator));
// For consistency, make sure the state still has us as processing
// the decl spec.
assert(state.getCurrentChunkIndex() == declarator.getNumTypeObjects() - 1);
state.setCurrentChunkIndex(declarator.getNumTypeObjects());
}
static void diagnoseAndRemoveTypeQualifiers(Sema &S, const DeclSpec &DS,
unsigned &TypeQuals,
QualType TypeSoFar,
unsigned RemoveTQs,
unsigned DiagID) {
// If this occurs outside a template instantiation, warn the user about
// it; they probably didn't mean to specify a redundant qualifier.
typedef std::pair<DeclSpec::TQ, SourceLocation> QualLoc;
for (QualLoc Qual : {QualLoc(DeclSpec::TQ_const, DS.getConstSpecLoc()),
QualLoc(DeclSpec::TQ_restrict, DS.getRestrictSpecLoc()),
QualLoc(DeclSpec::TQ_volatile, DS.getVolatileSpecLoc()),
QualLoc(DeclSpec::TQ_atomic, DS.getAtomicSpecLoc())}) {
if (!(RemoveTQs & Qual.first))
continue;
if (S.ActiveTemplateInstantiations.empty()) {
if (TypeQuals & Qual.first)
S.Diag(Qual.second, DiagID)
<< DeclSpec::getSpecifierName(Qual.first) << TypeSoFar
<< FixItHint::CreateRemoval(Qual.second);
}
TypeQuals &= ~Qual.first;
}
}
/// Return true if this is omitted block return type. Also check type
/// attributes and type qualifiers when returning true.
static bool checkOmittedBlockReturnType(Sema &S, Declarator &declarator,
QualType Result) {
if (!isOmittedBlockReturnType(declarator))
return false;
// Warn if we see type attributes for omitted return type on a block literal.
AttributeList *&attrs =
declarator.getMutableDeclSpec().getAttributes().getListRef();
AttributeList *prev = nullptr;
for (AttributeList *cur = attrs; cur; cur = cur->getNext()) {
AttributeList &attr = *cur;
// Skip attributes that were marked to be invalid or non-type
// attributes.
if (attr.isInvalid() || !attr.isTypeAttr()) {
prev = cur;
continue;
}
S.Diag(attr.getLoc(),
diag::warn_block_literal_attributes_on_omitted_return_type)
<< attr.getName();
// Remove cur from the list.
if (prev) {
prev->setNext(cur->getNext());
prev = cur;
} else {
attrs = cur->getNext();
}
}
// Warn if we see type qualifiers for omitted return type on a block literal.
const DeclSpec &DS = declarator.getDeclSpec();
unsigned TypeQuals = DS.getTypeQualifiers();
diagnoseAndRemoveTypeQualifiers(S, DS, TypeQuals, Result, (unsigned)-1,
diag::warn_block_literal_qualifiers_on_omitted_return_type);
declarator.getMutableDeclSpec().ClearTypeQualifiers();
return true;
}
/// Apply Objective-C type arguments to the given type.
static QualType applyObjCTypeArgs(Sema &S, SourceLocation loc, QualType type,
ArrayRef<TypeSourceInfo *> typeArgs,
SourceRange typeArgsRange,
bool failOnError = false) {
// We can only apply type arguments to an Objective-C class type.
const auto *objcObjectType = type->getAs<ObjCObjectType>();
if (!objcObjectType || !objcObjectType->getInterface()) {
S.Diag(loc, diag::err_objc_type_args_non_class)
<< type
<< typeArgsRange;
if (failOnError)
return QualType();
return type;
}
// The class type must be parameterized.
ObjCInterfaceDecl *objcClass = objcObjectType->getInterface();
ObjCTypeParamList *typeParams = objcClass->getTypeParamList();
if (!typeParams) {
S.Diag(loc, diag::err_objc_type_args_non_parameterized_class)
<< objcClass->getDeclName()
<< FixItHint::CreateRemoval(typeArgsRange);
if (failOnError)
return QualType();
return type;
}
// The type must not already be specialized.
if (objcObjectType->isSpecialized()) {
S.Diag(loc, diag::err_objc_type_args_specialized_class)
<< type
<< FixItHint::CreateRemoval(typeArgsRange);
if (failOnError)
return QualType();
return type;
}
// Check the type arguments.
SmallVector<QualType, 4> finalTypeArgs;
unsigned numTypeParams = typeParams->size();
bool anyPackExpansions = false;
for (unsigned i = 0, n = typeArgs.size(); i != n; ++i) {
TypeSourceInfo *typeArgInfo = typeArgs[i];
QualType typeArg = typeArgInfo->getType();
// Type arguments cannot have explicit qualifiers or nullability.
// We ignore indirect sources of these, e.g. behind typedefs or
// template arguments.
if (TypeLoc qual = typeArgInfo->getTypeLoc().findExplicitQualifierLoc()) {
bool diagnosed = false;
SourceRange rangeToRemove;
if (auto attr = qual.getAs<AttributedTypeLoc>()) {
rangeToRemove = attr.getLocalSourceRange();
if (attr.getTypePtr()->getImmediateNullability()) {
typeArg = attr.getTypePtr()->getModifiedType();
S.Diag(attr.getLocStart(),
diag::err_objc_type_arg_explicit_nullability)
<< typeArg << FixItHint::CreateRemoval(rangeToRemove);
diagnosed = true;
}
}
if (!diagnosed) {
S.Diag(qual.getLocStart(), diag::err_objc_type_arg_qualified)
<< typeArg << typeArg.getQualifiers().getAsString()
<< FixItHint::CreateRemoval(rangeToRemove);
}
}
// Remove qualifiers even if they're non-local.
typeArg = typeArg.getUnqualifiedType();
finalTypeArgs.push_back(typeArg);
if (typeArg->getAs<PackExpansionType>())
anyPackExpansions = true;
// Find the corresponding type parameter, if there is one.
ObjCTypeParamDecl *typeParam = nullptr;
if (!anyPackExpansions) {
if (i < numTypeParams) {
typeParam = typeParams->begin()[i];
} else {
// Too many arguments.
S.Diag(loc, diag::err_objc_type_args_wrong_arity)
<< false
<< objcClass->getDeclName()
<< (unsigned)typeArgs.size()
<< numTypeParams;
S.Diag(objcClass->getLocation(), diag::note_previous_decl)
<< objcClass;
if (failOnError)
return QualType();
return type;
}
}
// Objective-C object pointer types must be substitutable for the bounds.
if (const auto *typeArgObjC = typeArg->getAs<ObjCObjectPointerType>()) {
// If we don't have a type parameter to match against, assume
// everything is fine. There was a prior pack expansion that
// means we won't be able to match anything.
if (!typeParam) {
assert(anyPackExpansions && "Too many arguments?");
continue;
}
// Retrieve the bound.
QualType bound = typeParam->getUnderlyingType();
const auto *boundObjC = bound->getAs<ObjCObjectPointerType>();
// Determine whether the type argument is substitutable for the bound.
if (typeArgObjC->isObjCIdType()) {
// When the type argument is 'id', the only acceptable type
// parameter bound is 'id'.
if (boundObjC->isObjCIdType())
continue;
} else if (S.Context.canAssignObjCInterfaces(boundObjC, typeArgObjC)) {
// Otherwise, we follow the assignability rules.
continue;
}
// Diagnose the mismatch.
S.Diag(typeArgInfo->getTypeLoc().getLocStart(),
diag::err_objc_type_arg_does_not_match_bound)
<< typeArg << bound << typeParam->getDeclName();
S.Diag(typeParam->getLocation(), diag::note_objc_type_param_here)
<< typeParam->getDeclName();
if (failOnError)
return QualType();
return type;
}
// Block pointer types are permitted for unqualified 'id' bounds.
if (typeArg->isBlockPointerType()) {
// If we don't have a type parameter to match against, assume
// everything is fine. There was a prior pack expansion that
// means we won't be able to match anything.
if (!typeParam) {
assert(anyPackExpansions && "Too many arguments?");
continue;
}
// Retrieve the bound.
QualType bound = typeParam->getUnderlyingType();
if (bound->isBlockCompatibleObjCPointerType(S.Context))
continue;
// Diagnose the mismatch.
S.Diag(typeArgInfo->getTypeLoc().getLocStart(),
diag::err_objc_type_arg_does_not_match_bound)
<< typeArg << bound << typeParam->getDeclName();
S.Diag(typeParam->getLocation(), diag::note_objc_type_param_here)
<< typeParam->getDeclName();
if (failOnError)
return QualType();
return type;
}
// Dependent types will be checked at instantiation time.
if (typeArg->isDependentType()) {
continue;
}
// Diagnose non-id-compatible type arguments.
S.Diag(typeArgInfo->getTypeLoc().getLocStart(),
diag::err_objc_type_arg_not_id_compatible)
<< typeArg
<< typeArgInfo->getTypeLoc().getSourceRange();
if (failOnError)
return QualType();
return type;
}
// Make sure we didn't have the wrong number of arguments.
if (!anyPackExpansions && finalTypeArgs.size() != numTypeParams) {
S.Diag(loc, diag::err_objc_type_args_wrong_arity)
<< (typeArgs.size() < typeParams->size())
<< objcClass->getDeclName()
<< (unsigned)finalTypeArgs.size()
<< (unsigned)numTypeParams;
S.Diag(objcClass->getLocation(), diag::note_previous_decl)
<< objcClass;
if (failOnError)
return QualType();
return type;
}
// Success. Form the specialized type.
return S.Context.getObjCObjectType(type, finalTypeArgs, { }, false);
}
/// Apply Objective-C protocol qualifiers to the given type.
static QualType applyObjCProtocolQualifiers(
Sema &S, SourceLocation loc, SourceRange range, QualType type,
ArrayRef<ObjCProtocolDecl *> protocols,
const SourceLocation *protocolLocs,
bool failOnError = false) {
ASTContext &ctx = S.Context;
if (const ObjCObjectType *objT = dyn_cast<ObjCObjectType>(type.getTypePtr())){
// FIXME: Check for protocols to which the class type is already
// known to conform.
return ctx.getObjCObjectType(objT->getBaseType(),
objT->getTypeArgsAsWritten(),
protocols,
objT->isKindOfTypeAsWritten());
}
if (type->isObjCObjectType()) {
// Silently overwrite any existing protocol qualifiers.
// TODO: determine whether that's the right thing to do.
// FIXME: Check for protocols to which the class type is already
// known to conform.
return ctx.getObjCObjectType(type, { }, protocols, false);
}
// id<protocol-list>
if (type->isObjCIdType()) {
const ObjCObjectPointerType *objPtr = type->castAs<ObjCObjectPointerType>();
type = ctx.getObjCObjectType(ctx.ObjCBuiltinIdTy, { }, protocols,
objPtr->isKindOfType());
return ctx.getObjCObjectPointerType(type);
}
// Class<protocol-list>
if (type->isObjCClassType()) {
const ObjCObjectPointerType *objPtr = type->castAs<ObjCObjectPointerType>();
type = ctx.getObjCObjectType(ctx.ObjCBuiltinClassTy, { }, protocols,
objPtr->isKindOfType());
return ctx.getObjCObjectPointerType(type);
}
S.Diag(loc, diag::err_invalid_protocol_qualifiers)
<< range;
if (failOnError)
return QualType();
return type;
}
QualType Sema::BuildObjCObjectType(QualType BaseType,
SourceLocation Loc,
SourceLocation TypeArgsLAngleLoc,
ArrayRef<TypeSourceInfo *> TypeArgs,
SourceLocation TypeArgsRAngleLoc,
SourceLocation ProtocolLAngleLoc,
ArrayRef<ObjCProtocolDecl *> Protocols,
ArrayRef<SourceLocation> ProtocolLocs,
SourceLocation ProtocolRAngleLoc,
bool FailOnError) {
QualType Result = BaseType;
if (!TypeArgs.empty()) {
Result = applyObjCTypeArgs(*this, Loc, Result, TypeArgs,
SourceRange(TypeArgsLAngleLoc,
TypeArgsRAngleLoc),
FailOnError);
if (FailOnError && Result.isNull())
return QualType();
}
if (!Protocols.empty()) {
Result = applyObjCProtocolQualifiers(*this, Loc,
SourceRange(ProtocolLAngleLoc,
ProtocolRAngleLoc),
Result, Protocols,
ProtocolLocs.data(),
FailOnError);
if (FailOnError && Result.isNull())
return QualType();
}
return Result;
}
TypeResult Sema::actOnObjCProtocolQualifierType(
SourceLocation lAngleLoc,
ArrayRef<Decl *> protocols,
ArrayRef<SourceLocation> protocolLocs,
SourceLocation rAngleLoc) {
// Form id<protocol-list>.
QualType Result = Context.getObjCObjectType(
Context.ObjCBuiltinIdTy, { },
llvm::makeArrayRef(
(ObjCProtocolDecl * const *)protocols.data(),
protocols.size()),
false);
Result = Context.getObjCObjectPointerType(Result);
TypeSourceInfo *ResultTInfo = Context.CreateTypeSourceInfo(Result);
TypeLoc ResultTL = ResultTInfo->getTypeLoc();
auto ObjCObjectPointerTL = ResultTL.castAs<ObjCObjectPointerTypeLoc>();
ObjCObjectPointerTL.setStarLoc(SourceLocation()); // implicit
auto ObjCObjectTL = ObjCObjectPointerTL.getPointeeLoc()
.castAs<ObjCObjectTypeLoc>();
ObjCObjectTL.setHasBaseTypeAsWritten(false);
ObjCObjectTL.getBaseLoc().initialize(Context, SourceLocation());
// No type arguments.
ObjCObjectTL.setTypeArgsLAngleLoc(SourceLocation());
ObjCObjectTL.setTypeArgsRAngleLoc(SourceLocation());
// Fill in protocol qualifiers.
ObjCObjectTL.setProtocolLAngleLoc(lAngleLoc);
ObjCObjectTL.setProtocolRAngleLoc(rAngleLoc);
for (unsigned i = 0, n = protocols.size(); i != n; ++i)
ObjCObjectTL.setProtocolLoc(i, protocolLocs[i]);
// We're done. Return the completed type to the parser.
return CreateParsedType(Result, ResultTInfo);
}
TypeResult Sema::actOnObjCTypeArgsAndProtocolQualifiers(
Scope *S,
SourceLocation Loc,
ParsedType BaseType,
SourceLocation TypeArgsLAngleLoc,
ArrayRef<ParsedType> TypeArgs,
SourceLocation TypeArgsRAngleLoc,
SourceLocation ProtocolLAngleLoc,
ArrayRef<Decl *> Protocols,
ArrayRef<SourceLocation> ProtocolLocs,
SourceLocation ProtocolRAngleLoc) {
TypeSourceInfo *BaseTypeInfo = nullptr;
QualType T = GetTypeFromParser(BaseType, &BaseTypeInfo);
if (T.isNull())
return true;
// Handle missing type-source info.
if (!BaseTypeInfo)
BaseTypeInfo = Context.getTrivialTypeSourceInfo(T, Loc);
// Extract type arguments.
SmallVector<TypeSourceInfo *, 4> ActualTypeArgInfos;
for (unsigned i = 0, n = TypeArgs.size(); i != n; ++i) {
TypeSourceInfo *TypeArgInfo = nullptr;
QualType TypeArg = GetTypeFromParser(TypeArgs[i], &TypeArgInfo);
if (TypeArg.isNull()) {
ActualTypeArgInfos.clear();
break;
}
assert(TypeArgInfo && "No type source info?");
ActualTypeArgInfos.push_back(TypeArgInfo);
}
// Build the object type.
QualType Result = BuildObjCObjectType(
T, BaseTypeInfo->getTypeLoc().getSourceRange().getBegin(),
TypeArgsLAngleLoc, ActualTypeArgInfos, TypeArgsRAngleLoc,
ProtocolLAngleLoc,
llvm::makeArrayRef((ObjCProtocolDecl * const *)Protocols.data(),
Protocols.size()),
ProtocolLocs, ProtocolRAngleLoc,
/*FailOnError=*/false);
if (Result == T)
return BaseType;
// Create source information for this type.
TypeSourceInfo *ResultTInfo = Context.CreateTypeSourceInfo(Result);
TypeLoc ResultTL = ResultTInfo->getTypeLoc();
// For id<Proto1, Proto2> or Class<Proto1, Proto2>, we'll have an
// object pointer type. Fill in source information for it.
if (auto ObjCObjectPointerTL = ResultTL.getAs<ObjCObjectPointerTypeLoc>()) {
// The '*' is implicit.
ObjCObjectPointerTL.setStarLoc(SourceLocation());
ResultTL = ObjCObjectPointerTL.getPointeeLoc();
}
auto ObjCObjectTL = ResultTL.castAs<ObjCObjectTypeLoc>();
// Type argument information.
if (ObjCObjectTL.getNumTypeArgs() > 0) {
assert(ObjCObjectTL.getNumTypeArgs() == ActualTypeArgInfos.size());
ObjCObjectTL.setTypeArgsLAngleLoc(TypeArgsLAngleLoc);
ObjCObjectTL.setTypeArgsRAngleLoc(TypeArgsRAngleLoc);
for (unsigned i = 0, n = ActualTypeArgInfos.size(); i != n; ++i)
ObjCObjectTL.setTypeArgTInfo(i, ActualTypeArgInfos[i]);
} else {
ObjCObjectTL.setTypeArgsLAngleLoc(SourceLocation());
ObjCObjectTL.setTypeArgsRAngleLoc(SourceLocation());
}
// Protocol qualifier information.
if (ObjCObjectTL.getNumProtocols() > 0) {
assert(ObjCObjectTL.getNumProtocols() == Protocols.size());
ObjCObjectTL.setProtocolLAngleLoc(ProtocolLAngleLoc);
ObjCObjectTL.setProtocolRAngleLoc(ProtocolRAngleLoc);
for (unsigned i = 0, n = Protocols.size(); i != n; ++i)
ObjCObjectTL.setProtocolLoc(i, ProtocolLocs[i]);
} else {
ObjCObjectTL.setProtocolLAngleLoc(SourceLocation());
ObjCObjectTL.setProtocolRAngleLoc(SourceLocation());
}
// Base type.
ObjCObjectTL.setHasBaseTypeAsWritten(true);
if (ObjCObjectTL.getType() == T)
ObjCObjectTL.getBaseLoc().initializeFullCopy(BaseTypeInfo->getTypeLoc());
else
ObjCObjectTL.getBaseLoc().initialize(Context, Loc);
// We're done. Return the completed type to the parser.
return CreateParsedType(Result, ResultTInfo);
}
/// \brief Convert the specified declspec to the appropriate type
/// object.
/// \param state Specifies the declarator containing the declaration specifier
/// to be converted, along with other associated processing state.
/// \returns The type described by the declaration specifiers. This function
/// never returns null.
static QualType ConvertDeclSpecToType(TypeProcessingState &state) {
// FIXME: Should move the logic from DeclSpec::Finish to here for validity
// checking.
Sema &S = state.getSema();
Declarator &declarator = state.getDeclarator();
const DeclSpec &DS = declarator.getDeclSpec();
SourceLocation DeclLoc = declarator.getIdentifierLoc();
if (DeclLoc.isInvalid())
DeclLoc = DS.getLocStart();
ASTContext &Context = S.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) {
S.Diag(DS.getTypeSpecSignLoc(), diag::ext_invalid_sign_spec)
<< DS.getSpecifierName(DS.getTypeSpecType(),
Context.getPrintingPolicy());
Result = Context.getSignedWCharType();
} else {
assert(DS.getTypeSpecSign() == DeclSpec::TSS_unsigned &&
"Unknown TSS value");
S.Diag(DS.getTypeSpecSignLoc(), diag::ext_invalid_sign_spec)
<< DS.getSpecifierName(DS.getTypeSpecType(),
Context.getPrintingPolicy());
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:
// If this is a missing declspec in a block literal return context, then it
// is inferred from the return statements inside the block.
// The declspec is always missing in a lambda expr context; it is either
// specified with a trailing return type or inferred.
if (S.getLangOpts().CPlusPlus14 &&
declarator.getContext() == Declarator::LambdaExprContext) {
// In C++1y, a lambda's implicit return type is 'auto'.
Result = Context.getAutoDeductType();
break;
} else if (declarator.getContext() == Declarator::LambdaExprContext ||
checkOmittedBlockReturnType(S, declarator,
Context.DependentTy)) {
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 (S.getLangOpts().ImplicitInt) {
// In C89 mode, we only warn if there is a completely missing declspec
// when one is not allowed.
if (DS.isEmpty()) {
S.Diag(DeclLoc, diag::ext_missing_declspec)
<< DS.getSourceRange()
<< FixItHint::CreateInsertion(DS.getLocStart(), "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."
if (S.getLangOpts().CPlusPlus) {
S.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.
declarator.setInvalidType(true);
} else if (S.getLangOpts().OpenCLVersion >= 200 && DS.isTypeSpecPipe()){
S.Diag(DeclLoc, diag::err_missing_actual_pipe_type)
<< DS.getSourceRange();
declarator.setInvalidType(true);
} else {
S.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 or C++11 feature.
if (!S.getLangOpts().C99) {
if (S.getLangOpts().CPlusPlus)
S.Diag(DS.getTypeSpecWidthLoc(),
S.getLangOpts().CPlusPlus11 ?
diag::warn_cxx98_compat_longlong : diag::ext_cxx11_longlong);
else
S.Diag(DS.getTypeSpecWidthLoc(), diag::ext_c99_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 or C++11 feature.
if (!S.getLangOpts().C99) {
if (S.getLangOpts().CPlusPlus)
S.Diag(DS.getTypeSpecWidthLoc(),
S.getLangOpts().CPlusPlus11 ?
diag::warn_cxx98_compat_longlong : diag::ext_cxx11_longlong);
else
S.Diag(DS.getTypeSpecWidthLoc(), diag::ext_c99_longlong);
}
break;
}
}
break;
}
case DeclSpec::TST_int128:
if (!S.Context.getTargetInfo().hasInt128Type())
S.Diag(DS.getTypeSpecTypeLoc(), diag::err_int128_unsupported);
if (DS.getTypeSpecSign() == DeclSpec::TSS_unsigned)
Result = Context.UnsignedInt128Ty;
else
Result = Context.Int128Ty;
break;
case DeclSpec::TST_half: Result = Context.HalfTy; 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;
if (S.getLangOpts().OpenCL &&
!((S.getLangOpts().OpenCLVersion >= 120) ||
S.getOpenCLOptions().cl_khr_fp64)) {
S.Diag(DS.getTypeSpecTypeLoc(), diag::err_type_requires_extension)
<< Result << "cl_khr_fp64";
declarator.setInvalidType(true);
}
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
S.Diag(DS.getTypeSpecTypeLoc(), diag::err_decimal_unsupported);
Result = Context.IntTy;
declarator.setInvalidType(true);
break;
case DeclSpec::TST_class:
case DeclSpec::TST_enum:
case DeclSpec::TST_union:
case DeclSpec::TST_struct:
case DeclSpec::TST_interface: {
TypeDecl *D = dyn_cast_or_null<TypeDecl>(DS.getRepAsDecl());
if (!D) {
// This can happen in C++ with ambiguous lookups.
Result = Context.IntTy;
declarator.setInvalidType(true);
break;
}
// If the type is deprecated or unavailable, diagnose it.
S.DiagnoseUseOfDecl(D, DS.getTypeSpecTypeNameLoc());
assert(DS.getTypeSpecWidth() == 0 && DS.getTypeSpecComplex() == 0 &&
DS.getTypeSpecSign() == 0 && "No qualifiers on tag names!");
// TypeQuals handled by caller.
Result = Context.getTypeDeclType(D);
// In both C and C++, make an ElaboratedType.
ElaboratedTypeKeyword Keyword
= ElaboratedType::getKeywordForTypeSpec(DS.getTypeSpecType());
Result = S.getElaboratedType(Keyword, DS.getTypeSpecScope(), Result);
break;
}
case DeclSpec::TST_typename: {
assert(DS.getTypeSpecWidth() == 0 && DS.getTypeSpecComplex() == 0 &&
DS.getTypeSpecSign() == 0 &&
"Can't handle qualifiers on typedef names yet!");
Result = S.GetTypeFromParser(DS.getRepAsType());
if (Result.isNull()) {
declarator.setInvalidType(true);
} else if (S.getLangOpts().OpenCL) {
if (Result->getAs<AtomicType>()) {
StringRef TypeName = Result.getBaseTypeIdentifier()->getName();
bool NoExtTypes =
llvm::StringSwitch<bool>(TypeName)
.Cases("atomic_int", "atomic_uint", "atomic_float",
"atomic_flag", true)
.Default(false);
if (!S.getOpenCLOptions().cl_khr_int64_base_atomics && !NoExtTypes) {
S.Diag(DS.getTypeSpecTypeLoc(), diag::err_type_requires_extension)
<< Result << "cl_khr_int64_base_atomics";
declarator.setInvalidType(true);
}
if (!S.getOpenCLOptions().cl_khr_int64_extended_atomics &&
!NoExtTypes) {
S.Diag(DS.getTypeSpecTypeLoc(), diag::err_type_requires_extension)
<< Result << "cl_khr_int64_extended_atomics";
declarator.setInvalidType(true);
}
if (!S.getOpenCLOptions().cl_khr_fp64 &&
!TypeName.compare("atomic_double")) {
S.Diag(DS.getTypeSpecTypeLoc(), diag::err_type_requires_extension)
<< Result << "cl_khr_fp64";
declarator.setInvalidType(true);
}
} else if (!S.getOpenCLOptions().cl_khr_gl_msaa_sharing &&
(Result->isImage2dMSAAT() || Result->isImage2dArrayMSAAT() ||
Result->isImage2dArrayMSAATDepth() ||
Result->isImage2dMSAATDepth())) {
S.Diag(DS.getTypeSpecTypeLoc(), diag::err_type_requires_extension)
<< Result << "cl_khr_gl_msaa_sharing";
declarator.setInvalidType(true);
}
}
// TypeQuals handled by caller.
break;
}
case DeclSpec::TST_typeofType:
// FIXME: Preserve type source info.
Result = S.GetTypeFromParser(DS.getRepAsType());
assert(!Result.isNull() && "Didn't get a type for typeof?");
if (!Result->isDependentType())
if (const TagType *TT = Result->getAs<TagType>())
S.DiagnoseUseOfDecl(TT->getDecl(), DS.getTypeSpecTypeLoc());
// TypeQuals handled by caller.
Result = Context.getTypeOfType(Result);
break;
case DeclSpec::TST_typeofExpr: {
Expr *E = DS.getRepAsExpr();
assert(E && "Didn't get an expression for typeof?");
// TypeQuals handled by caller.
Result = S.BuildTypeofExprType(E, DS.getTypeSpecTypeLoc());
if (Result.isNull()) {
Result = Context.IntTy;
declarator.setInvalidType(true);
}
break;
}
case DeclSpec::TST_decltype: {
Expr *E = DS.getRepAsExpr();
assert(E && "Didn't get an expression for decltype?");
// TypeQuals handled by caller.
Result = S.BuildDecltypeType(E, DS.getTypeSpecTypeLoc());
if (Result.isNull()) {
Result = Context.IntTy;
declarator.setInvalidType(true);
}
break;
}
case DeclSpec::TST_underlyingType:
Result = S.GetTypeFromParser(DS.getRepAsType());
assert(!Result.isNull() && "Didn't get a type for __underlying_type?");
Result = S.BuildUnaryTransformType(Result,
UnaryTransformType::EnumUnderlyingType,
DS.getTypeSpecTypeLoc());
if (Result.isNull()) {
Result = Context.IntTy;
declarator.setInvalidType(true);
}
break;
case DeclSpec::TST_auto:
// TypeQuals handled by caller.
// If auto is mentioned in a lambda parameter context, convert it to a
// template parameter type immediately, with the appropriate depth and
// index, and update sema's state (LambdaScopeInfo) for the current lambda
// being analyzed (which tracks the invented type template parameter).
if (declarator.getContext() == Declarator::LambdaExprParameterContext) {
sema::LambdaScopeInfo *LSI = S.getCurLambda();
assert(LSI && "No LambdaScopeInfo on the stack!");
const unsigned TemplateParameterDepth = LSI->AutoTemplateParameterDepth;
const unsigned AutoParameterPosition = LSI->AutoTemplateParams.size();
const bool IsParameterPack = declarator.hasEllipsis();
// Turns out we must create the TemplateTypeParmDecl here to
// retrieve the corresponding template parameter type.
TemplateTypeParmDecl *CorrespondingTemplateParam =
TemplateTypeParmDecl::Create(Context,
// Temporarily add to the TranslationUnit DeclContext. When the
// associated TemplateParameterList is attached to a template
// declaration (such as FunctionTemplateDecl), the DeclContext
// for each template parameter gets updated appropriately via
// a call to AdoptTemplateParameterList.
Context.getTranslationUnitDecl(),
/*KeyLoc*/ SourceLocation(),
/*NameLoc*/ declarator.getLocStart(),
TemplateParameterDepth,
AutoParameterPosition, // our template param index
/* Identifier*/ nullptr, false, IsParameterPack);
LSI->AutoTemplateParams.push_back(CorrespondingTemplateParam);
// Replace the 'auto' in the function parameter with this invented
// template type parameter.
Result = QualType(CorrespondingTemplateParam->getTypeForDecl(), 0);
} else {
Result = Context.getAutoType(QualType(), AutoTypeKeyword::Auto, false);
}
break;
case DeclSpec::TST_auto_type:
Result = Context.getAutoType(QualType(), AutoTypeKeyword::GNUAutoType, false);
break;
case DeclSpec::TST_decltype_auto:
Result = Context.getAutoType(QualType(), AutoTypeKeyword::DecltypeAuto,
/*IsDependent*/ false);
break;
case DeclSpec::TST_unknown_anytype:
Result = Context.UnknownAnyTy;
break;
case DeclSpec::TST_atomic:
Result = S.GetTypeFromParser(DS.getRepAsType());
assert(!Result.isNull() && "Didn't get a type for _Atomic?");
Result = S.BuildAtomicType(Result, DS.getTypeSpecTypeLoc());
if (Result.isNull()) {
Result = Context.IntTy;
declarator.setInvalidType(true);
}
break;
case DeclSpec::TST_error:
Result = Context.IntTy;
declarator.setInvalidType(true);
break;
}
// Handle complex types.
if (DS.getTypeSpecComplex() == DeclSpec::TSC_complex) {
if (S.getLangOpts().Freestanding)
S.Diag(DS.getTypeSpecComplexLoc(), diag::ext_freestanding_complex);
Result = Context.getComplexType(Result);
} else if (DS.isTypeAltiVecVector()) {
unsigned typeSize = static_cast<unsigned>(Context.getTypeSize(Result));
assert(typeSize > 0 && "type size for vector must be greater than 0 bits");
VectorType::VectorKind VecKind = VectorType::AltiVecVector;
if (DS.isTypeAltiVecPixel())
VecKind = VectorType::AltiVecPixel;
else if (DS.isTypeAltiVecBool())
VecKind = VectorType::AltiVecBool;
Result = Context.getVectorType(Result, 128/typeSize, VecKind);
}
// FIXME: Imaginary.
if (DS.getTypeSpecComplex() == DeclSpec::TSC_imaginary)
S.Diag(DS.getTypeSpecComplexLoc(), diag::err_imaginary_not_supported);
// Before we process any type attributes, synthesize a block literal
// function declarator if necessary.
if (declarator.getContext() == Declarator::BlockLiteralContext)
maybeSynthesizeBlockSignature(state, Result);
// Apply any type attributes from the decl spec. This may cause the
// list of type attributes to be temporarily saved while the type
// attributes are pushed around.
// pipe attributes will be handled later ( at GetFullTypeForDeclarator )
if (!DS.isTypeSpecPipe())
processTypeAttrs(state, Result, TAL_DeclSpec, DS.getAttributes().getList());
// Apply const/volatile/restrict qualifiers to T.
if (unsigned TypeQuals = DS.getTypeQualifiers()) {
// Warn about CV qualifiers on function types.
// C99 6.7.3p8:
// If the specification of a function type includes any type qualifiers,
// the behavior is undefined.
// C++11 [dcl.fct]p7:
// The effect of a cv-qualifier-seq in a function declarator is not the
// same as adding cv-qualification on top of the function type. In the
// latter case, the cv-qualifiers are ignored.
if (TypeQuals && Result->isFunctionType()) {
diagnoseAndRemoveTypeQualifiers(
S, DS, TypeQuals, Result, DeclSpec::TQ_const | DeclSpec::TQ_volatile,
S.getLangOpts().CPlusPlus
? diag::warn_typecheck_function_qualifiers_ignored
: diag::warn_typecheck_function_qualifiers_unspecified);
// No diagnostic for 'restrict' or '_Atomic' applied to a
// function type; we'll diagnose those later, in BuildQualifiedType.
}
// C++11 [dcl.ref]p1:
// Cv-qualified references are ill-formed except when the
// cv-qualifiers are introduced through the use of a typedef-name
// or decltype-specifier, in which case the cv-qualifiers are ignored.
//
// There don't appear to be any other contexts in which a cv-qualified
// reference type could be formed, so the 'ill-formed' clause here appears
// to never happen.
if (TypeQuals && Result->isReferenceType()) {
diagnoseAndRemoveTypeQualifiers(
S, DS, TypeQuals, Result,
DeclSpec::TQ_const | DeclSpec::TQ_volatile | DeclSpec::TQ_atomic,
diag::warn_typecheck_reference_qualifiers);
}
// C90 6.5.3 constraints: "The same type qualifier shall not appear more
// than once in the same specifier-list or qualifier-list, either directly
// or via one or more typedefs."
if (!S.getLangOpts().C99 && !S.getLangOpts().CPlusPlus
&& TypeQuals & Result.getCVRQualifiers()) {
if (TypeQuals & DeclSpec::TQ_const && Result.isConstQualified()) {
S.Diag(DS.getConstSpecLoc(), diag::ext_duplicate_declspec)
<< "const";
}
if (TypeQuals & DeclSpec::TQ_volatile && Result.isVolatileQualified()) {
S.Diag(DS.getVolatileSpecLoc(), diag::ext_duplicate_declspec)
<< "volatile";
}
// C90 doesn't have restrict nor _Atomic, so it doesn't force us to
// produce a warning in this case.
}
QualType Qualified = S.BuildQualifiedType(Result, DeclLoc, TypeQuals, &DS);
// If adding qualifiers fails, just use the unqualified type.
if (Qualified.isNull())
declarator.setInvalidType(true);
else
Result = Qualified;
}
assert(!Result.isNull() && "This function should not return a null type");
return Result;
}
static std::string getPrintableNameForEntity(DeclarationName Entity) {
if (Entity)
return Entity.getAsString();
return "type name";
}
QualType Sema::BuildQualifiedType(QualType T, SourceLocation Loc,
Qualifiers Qs, const DeclSpec *DS) {
if (T.isNull())
return QualType();
// Enforce C99 6.7.3p2: "Types other than pointer types derived from
// object or incomplete types shall not be restrict-qualified."
if (Qs.hasRestrict()) {
unsigned DiagID = 0;
QualType ProblemTy;
if (T->isAnyPointerType() || T->isReferenceType() ||
T->isMemberPointerType()) {
QualType EltTy;
if (T->isObjCObjectPointerType())
EltTy = T;
else if (const MemberPointerType *PTy = T->getAs<MemberPointerType>())
EltTy = PTy->getPointeeType();
else
EltTy = T->getPointeeType();
// If we have a pointer or reference, the pointee must have an object
// incomplete type.
if (!EltTy->isIncompleteOrObjectType()) {
DiagID = diag::err_typecheck_invalid_restrict_invalid_pointee;
ProblemTy = EltTy;
}
} else if (!T->isDependentType()) {
DiagID = diag::err_typecheck_invalid_restrict_not_pointer;
ProblemTy = T;
}
if (DiagID) {
Diag(DS ? DS->getRestrictSpecLoc() : Loc, DiagID) << ProblemTy;
Qs.removeRestrict();
}
}
return Context.getQualifiedType(T, Qs);
}
QualType Sema::BuildQualifiedType(QualType T, SourceLocation Loc,
unsigned CVRA, const DeclSpec *DS) {
if (T.isNull())
return QualType();
// Convert from DeclSpec::TQ to Qualifiers::TQ by just dropping TQ_atomic.
unsigned CVR = CVRA & ~DeclSpec::TQ_atomic;
// C11 6.7.3/5:
// If the same qualifier appears more than once in the same
// specifier-qualifier-list, either directly or via one or more typedefs,
// the behavior is the same as if it appeared only once.
//
// It's not specified what happens when the _Atomic qualifier is applied to
// a type specified with the _Atomic specifier, but we assume that this
// should be treated as if the _Atomic qualifier appeared multiple times.
if (CVRA & DeclSpec::TQ_atomic && !T->isAtomicType()) {
// C11 6.7.3/5:
// If other qualifiers appear along with the _Atomic qualifier in a
// specifier-qualifier-list, the resulting type is the so-qualified
// atomic type.
//
// Don't need to worry about array types here, since _Atomic can't be
// applied to such types.
SplitQualType Split = T.getSplitUnqualifiedType();
T = BuildAtomicType(QualType(Split.Ty, 0),
DS ? DS->getAtomicSpecLoc() : Loc);
if (T.isNull())
return T;
Split.Quals.addCVRQualifiers(CVR);
return BuildQualifiedType(T, Loc, Split.Quals);
}
return BuildQualifiedType(T, Loc, Qualifiers::fromCVRMask(CVR), DS);
}
/// \brief Build a paren type including \p T.
QualType Sema::BuildParenType(QualType T) {
return Context.getParenType(T);
}
/// Given that we're building a pointer or reference to the given
static QualType inferARCLifetimeForPointee(Sema &S, QualType type,
SourceLocation loc,
bool isReference) {
// Bail out if retention is unrequired or already specified.
if (!type->isObjCLifetimeType() ||
type.getObjCLifetime() != Qualifiers::OCL_None)
return type;
Qualifiers::ObjCLifetime implicitLifetime = Qualifiers::OCL_None;
// If the object type is const-qualified, we can safely use
// __unsafe_unretained. This is safe (because there are no read
// barriers), and it'll be safe to coerce anything but __weak* to
// the resulting type.
if (type.isConstQualified()) {
implicitLifetime = Qualifiers::OCL_ExplicitNone;
// Otherwise, check whether the static type does not require
// retaining. This currently only triggers for Class (possibly
// protocol-qualifed, and arrays thereof).
} else if (type->isObjCARCImplicitlyUnretainedType()) {
implicitLifetime = Qualifiers::OCL_ExplicitNone;
// If we are in an unevaluated context, like sizeof, skip adding a
// qualification.
} else if (S.isUnevaluatedContext()) {
return type;
// If that failed, give an error and recover using __strong. __strong
// is the option most likely to prevent spurious second-order diagnostics,
// like when binding a reference to a field.
} else {
// These types can show up in private ivars in system headers, so
// we need this to not be an error in those cases. Instead we
// want to delay.
if (S.DelayedDiagnostics.shouldDelayDiagnostics()) {
S.DelayedDiagnostics.add(
sema::DelayedDiagnostic::makeForbiddenType(loc,
diag::err_arc_indirect_no_ownership, type, isReference));
} else {
S.Diag(loc, diag::err_arc_indirect_no_ownership) << type << isReference;
}
implicitLifetime = Qualifiers::OCL_Strong;
}
assert(implicitLifetime && "didn't infer any lifetime!");
Qualifiers qs;
qs.addObjCLifetime(implicitLifetime);
return S.Context.getQualifiedType(type, qs);
}
static std::string getFunctionQualifiersAsString(const FunctionProtoType *FnTy){
std::string Quals =
Qualifiers::fromCVRMask(FnTy->getTypeQuals()).getAsString();
switch (FnTy->getRefQualifier()) {
case RQ_None:
break;
case RQ_LValue:
if (!Quals.empty())
Quals += ' ';
Quals += '&';
break;
case RQ_RValue:
if (!Quals.empty())
Quals += ' ';
Quals += "&&";
break;
}
return Quals;
}
namespace {
/// Kinds of declarator that cannot contain a qualified function type.
///
/// C++98 [dcl.fct]p4 / C++11 [dcl.fct]p6:
/// a function type with a cv-qualifier or a ref-qualifier can only appear
/// at the topmost level of a type.
///
/// Parens and member pointers are permitted. We don't diagnose array and
/// function declarators, because they don't allow function types at all.
///
/// The values of this enum are used in diagnostics.
enum QualifiedFunctionKind { QFK_BlockPointer, QFK_Pointer, QFK_Reference };
}
/// Check whether the type T is a qualified function type, and if it is,
/// diagnose that it cannot be contained within the given kind of declarator.
static bool checkQualifiedFunction(Sema &S, QualType T, SourceLocation Loc,
QualifiedFunctionKind QFK) {
// Does T refer to a function type with a cv-qualifier or a ref-qualifier?
const FunctionProtoType *FPT = T->getAs<FunctionProtoType>();
if (!FPT || (FPT->getTypeQuals() == 0 && FPT->getRefQualifier() == RQ_None))
return false;
S.Diag(Loc, diag::err_compound_qualified_function_type)
<< QFK << isa<FunctionType>(T.IgnoreParens()) << T
<< getFunctionQualifiersAsString(FPT);
return true;
}
/// \brief Build a pointer type.
///
/// \param T The type to which we'll be building a pointer.
///
/// \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,
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();
}
if (checkQualifiedFunction(*this, T, Loc, QFK_Pointer))
return QualType();
assert(!T->isObjCObjectType() && "Should build ObjCObjectPointerType");
// In ARC, it is forbidden to build pointers to unqualified pointers.
if (getLangOpts().ObjCAutoRefCount)
T = inferARCLifetimeForPointee(*this, T, Loc, /*reference*/ false);
// Build the pointer type.
return Context.getPointerType(T);
}
/// \brief Build a reference type.
///
/// \param T The type to which we'll be building a reference.
///
/// \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,
SourceLocation Loc,
DeclarationName Entity) {
assert(Context.getCanonicalType(T) != Context.OverloadTy &&
"Unresolved overloaded function type");
// C++0x [dcl.ref]p6:
// If a typedef (7.1.3), a type template-parameter (14.3.1), or a
// decltype-specifier (7.1.6.2) denotes a type TR that is a reference to a
// type T, an attempt to create the type "lvalue reference to cv TR" creates
// the type "lvalue reference to T", while an attempt to create the type
// "rvalue reference to cv TR" creates the type TR.
bool LValueRef = SpelledAsLValue || T->getAs<LValueReferenceType>();
// 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++0x.
// DR 106 and 540 introduce reference-collapsing into C++98/03.
// 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();
}
if (checkQualifiedFunction(*this, T, Loc, QFK_Reference))
return QualType();
// In ARC, it is forbidden to build references to unqualified pointers.
if (getLangOpts().ObjCAutoRefCount)
T = inferARCLifetimeForPointee(*this, T, Loc, /*reference*/ true);
// Handle restrict on references.
if (LValueRef)
return Context.getLValueReferenceType(T, SpelledAsLValue);
return Context.getRValueReferenceType(T);
}
/// \brief Build a Pipe type.
///
/// \param T The type to which we'll be building a Pipe.
///
/// \param Loc We do not use it for now.
///
/// \returns A suitable pipe type, if there are no errors. Otherwise, returns a
/// NULL type.
QualType Sema::BuildPipeType(QualType T, SourceLocation Loc) {
assert(!T->isObjCObjectType() && "Should build ObjCObjectPointerType");
// Build the pipe type.
return Context.getPipeType(T);
}
/// Check whether the specified array size makes the array type a VLA. If so,
/// return true, if not, return the size of the array in SizeVal.
static bool isArraySizeVLA(Sema &S, Expr *ArraySize, llvm::APSInt &SizeVal) {
// If the size is an ICE, it certainly isn't a VLA. If we're in a GNU mode
// (like gnu99, but not c99) accept any evaluatable value as an extension.
class VLADiagnoser : public Sema::VerifyICEDiagnoser {
public:
VLADiagnoser() : Sema::VerifyICEDiagnoser(true) {}
void diagnoseNotICE(Sema &S, SourceLocation Loc, SourceRange SR) override {
}
void diagnoseFold(Sema &S, SourceLocation Loc, SourceRange SR) override {
S.Diag(Loc, diag::ext_vla_folded_to_constant) << SR;
}
} Diagnoser;
return S.VerifyIntegerConstantExpression(ArraySize, &SizeVal, Diagnoser,
S.LangOpts.GNUMode).isInvalid();
}
/// \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 Brackets The range from the opening '[' to the closing ']'.
///
/// \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();
if (getLangOpts().CPlusPlus) {
// C++ [dcl.array]p1:
// T is called the array element type; this type shall not be a reference
// type, the (possibly cv-qualified) type void, a function type or an
// abstract class type.
//
// C++ [dcl.array]p3:
// When several "array of" specifications are adjacent, [...] only the
// first of the constant expressions that specify the bounds of the arrays
// may be omitted.
//
// Note: function types are handled in the common path with C.
if (T->isReferenceType()) {
Diag(Loc, diag::err_illegal_decl_array_of_references)
<< getPrintableNameForEntity(Entity) << T;
return QualType();
}
if (T->isVoidType() || T->isIncompleteArrayType()) {
Diag(Loc, diag::err_illegal_decl_array_incomplete_type) << T;
return QualType();
}
if (RequireNonAbstractType(Brackets.getBegin(), T,
diag::err_array_of_abstract_type))
return QualType();
// Mentioning a member pointer type for an array type causes us to lock in
// an inheritance model, even if it's inside an unused typedef.
if (Context.getTargetInfo().getCXXABI().isMicrosoft())
if (const MemberPointerType *MPTy = T->getAs<MemberPointerType>())
if (!MPTy->getClass()->isDependentType())
(void)isCompleteType(Loc, T);
} else {
// 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 (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();
}
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->isObjCObjectType()) {
Diag(Loc, diag::err_objc_array_of_interfaces) << T;
return QualType();
}
// Do placeholder conversions on the array size expression.
if (ArraySize && ArraySize->hasPlaceholderType()) {
ExprResult Result = CheckPlaceholderExpr(ArraySize);
if (Result.isInvalid()) return QualType();
ArraySize = Result.get();
}
// Do lvalue-to-rvalue conversions on the array size expression.
if (ArraySize && !ArraySize->isRValue()) {
ExprResult Result = DefaultLvalueConversion(ArraySize);
if (Result.isInvalid())
return QualType();
ArraySize = Result.get();
}
// C99 6.7.5.2p1: The size expression shall have integer type.
// C++11 allows contextual conversions to such types.
if (!getLangOpts().CPlusPlus11 &&
ArraySize && !ArraySize->isTypeDependent() &&
!ArraySize->getType()->isIntegralOrUnscopedEnumerationType()) {
Diag(ArraySize->getLocStart(), diag::err_array_size_non_int)
<< ArraySize->getType() << ArraySize->getSourceRange();
return QualType();
}
llvm::APSInt ConstVal(Context.getTypeSize(Context.getSizeType()));
if (!ArraySize) {
if (ASM == ArrayType::Star)
T = Context.getVariableArrayType(T, nullptr, ASM, Quals, Brackets);
else
T = Context.getIncompleteArrayType(T, ASM, Quals);
} else if (ArraySize->isTypeDependent() || ArraySize->isValueDependent()) {
T = Context.getDependentSizedArrayType(T, ArraySize, ASM, Quals, Brackets);
} else if ((!T->isDependentType() && !T->isIncompleteType() &&
!T->isConstantSizeType()) ||
isArraySizeVLA(*this, ArraySize, ConstVal)) {
// Even in C++11, don't allow contextual conversions in the array bound
// of a VLA.
if (getLangOpts().CPlusPlus11 &&
!ArraySize->getType()->isIntegralOrUnscopedEnumerationType()) {
Diag(ArraySize->getLocStart(), diag::err_array_size_non_int)
<< ArraySize->getType() << ArraySize->getSourceRange();
return QualType();
}
// C99: an array with an element type that has a non-constant-size is a VLA.
// C99: an array with a non-ICE size is a VLA. We accept any expression
// that we can fold to a non-zero positive value as an extension.
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()) {
if (Entity)
Diag(ArraySize->getLocStart(), diag::err_decl_negative_array_size)
<< getPrintableNameForEntity(Entity) << ArraySize->getSourceRange();
else
Diag(ArraySize->getLocStart(), diag::err_typecheck_negative_array_size)
<< ArraySize->getSourceRange();
return QualType();
}
if (ConstVal == 0) {
// GCC accepts zero sized static arrays. We allow them when
// we're not in a SFINAE context.
Diag(ArraySize->getLocStart(),
isSFINAEContext()? diag::err_typecheck_zero_array_size
: diag::ext_typecheck_zero_array_size)
<< ArraySize->getSourceRange();
if (ASM == ArrayType::Static) {
Diag(ArraySize->getLocStart(),
diag::warn_typecheck_zero_static_array_size)
<< ArraySize->getSourceRange();
ASM = ArrayType::Normal;
}
} else if (!T->isDependentType() && !T->isVariablyModifiedType() &&
!T->isIncompleteType() && !T->isUndeducedType()) {
// Is the array too large?
unsigned ActiveSizeBits
= ConstantArrayType::getNumAddressingBits(Context, T, ConstVal);
if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context)) {
Diag(ArraySize->getLocStart(), diag::err_array_too_large)
<< ConstVal.toString(10)
<< ArraySize->getSourceRange();
return QualType();
}
}
T = Context.getConstantArrayType(T, ConstVal, ASM, Quals);
}
// OpenCL v1.2 s6.9.d: variable length arrays are not supported.
if (getLangOpts().OpenCL && T->isVariableArrayType()) {
Diag(Loc, diag::err_opencl_vla);
return QualType();
}
// If this is not C99, extwarn about VLA's and C99 array size modifiers.
if (!getLangOpts().C99) {
if (T->isVariableArrayType()) {
// Prohibit the use of non-POD types in VLAs.
QualType BaseT = Context.getBaseElementType(T);
if (!T->isDependentType() && isCompleteType(Loc, BaseT) &&
!BaseT.isPODType(Context) && !BaseT->isObjCLifetimeType()) {
Diag(Loc, diag::err_vla_non_pod) << BaseT;
return QualType();
}
// Prohibit the use of VLAs during template argument deduction.
else if (isSFINAEContext()) {
Diag(Loc, diag::err_vla_in_sfinae);
return QualType();
}
// Just extwarn about VLAs.
else
Diag(Loc, diag::ext_vla);
} else if (ASM != ArrayType::Normal || Quals != 0)
Diag(Loc,
getLangOpts().CPlusPlus? diag::err_c99_array_usage_cxx
: diag::ext_c99_array_usage) << ASM;
}
if (T->isVariableArrayType()) {
// Warn about VLAs for -Wvla.
Diag(Loc, diag::warn_vla_used);
}
return T;
}
/// \brief Build an ext-vector type.
///
/// Run the required checks for the extended vector type.
QualType Sema::BuildExtVectorType(QualType T, Expr *ArraySize,
SourceLocation AttrLoc) {
// Unlike gcc's vector_size attribute, we do not allow vectors to be defined
// in conjunction with complex types (pointers, arrays, functions, etc.).
//
// Additionally, OpenCL prohibits vectors of booleans (they're considered a
// reserved data type under OpenCL v2.0 s6.1.4), we don't support selects
// on bitvectors, and we have no well-defined ABI for bitvectors, so vectors
// of bool aren't allowed.
if ((!T->isDependentType() && !T->isIntegerType() &&
!T->isRealFloatingType()) ||
T->isBooleanType()) {
Diag(AttrLoc, diag::err_attribute_invalid_vector_type) << T;
return QualType();
}
if (!ArraySize->isTypeDependent() && !ArraySize->isValueDependent()) {
llvm::APSInt vecSize(32);
if (!ArraySize->isIntegerConstantExpr(vecSize, Context)) {
Diag(AttrLoc, diag::err_attribute_argument_type)
<< "ext_vector_type" << AANT_ArgumentIntegerConstant
<< ArraySize->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)
<< ArraySize->getSourceRange();
return QualType();
}
if (VectorType::isVectorSizeTooLarge(vectorSize)) {
Diag(AttrLoc, diag::err_attribute_size_too_large)
<< ArraySize->getSourceRange();
return QualType();
}
return Context.getExtVectorType(T, vectorSize);
}
return Context.getDependentSizedExtVectorType(T, ArraySize, AttrLoc);
}
bool Sema::CheckFunctionReturnType(QualType T, SourceLocation Loc) {
if (T->isArrayType() || T->isFunctionType()) {
Diag(Loc, diag::err_func_returning_array_function)
<< T->isFunctionType() << T;
return true;
}
// Functions cannot return half FP.
if (T->isHalfType() && !getLangOpts().HalfArgsAndReturns) {
Diag(Loc, diag::err_parameters_retval_cannot_have_fp16_type) << 1 <<
FixItHint::CreateInsertion(Loc, "*");
return true;
}
// Methods cannot return interface types. All ObjC objects are
// passed by reference.
if (T->isObjCObjectType()) {
Diag(Loc, diag::err_object_cannot_be_passed_returned_by_value) << 0 << T;
return 0;
}
return false;
}
/// Check the extended parameter information. Most of the necessary
/// checking should occur when applying the parameter attribute; the
/// only other checks required are positional restrictions.
static void checkExtParameterInfos(Sema &S, ArrayRef<QualType> paramTypes,
const FunctionProtoType::ExtProtoInfo &EPI,
llvm::function_ref<SourceLocation(unsigned)> getParamLoc) {
assert(EPI.ExtParameterInfos && "shouldn't get here without param infos");
bool hasCheckedSwiftCall = false;
auto checkForSwiftCC = [&](unsigned paramIndex) {
// Only do this once.
if (hasCheckedSwiftCall) return;
hasCheckedSwiftCall = true;
if (EPI.ExtInfo.getCC() == CC_Swift) return;
S.Diag(getParamLoc(paramIndex), diag::err_swift_param_attr_not_swiftcall)
<< getParameterABISpelling(EPI.ExtParameterInfos[paramIndex].getABI());
};
for (size_t paramIndex = 0, numParams = paramTypes.size();
paramIndex != numParams; ++paramIndex) {
switch (EPI.ExtParameterInfos[paramIndex].getABI()) {
// Nothing interesting to check for orindary-ABI parameters.
case ParameterABI::Ordinary:
continue;
// swift_indirect_result parameters must be a prefix of the function
// arguments.
case ParameterABI::SwiftIndirectResult:
checkForSwiftCC(paramIndex);
if (paramIndex != 0 &&
EPI.ExtParameterInfos[paramIndex - 1].getABI()
!= ParameterABI::SwiftIndirectResult) {
S.Diag(getParamLoc(paramIndex),
diag::err_swift_indirect_result_not_first);
}
continue;
// swift_context parameters must be the last parameter except for
// a possible swift_error parameter.
case ParameterABI::SwiftContext:
checkForSwiftCC(paramIndex);
if (!(paramIndex == numParams - 1 ||
(paramIndex == numParams - 2 &&
EPI.ExtParameterInfos[numParams - 1].getABI()
== ParameterABI::SwiftErrorResult))) {
S.Diag(getParamLoc(paramIndex),
diag::err_swift_context_not_before_swift_error_result);
}
continue;
// swift_error parameters must be the last parameter.
case ParameterABI::SwiftErrorResult:
checkForSwiftCC(paramIndex);
if (paramIndex != numParams - 1) {
S.Diag(getParamLoc(paramIndex),
diag::err_swift_error_result_not_last);
} else if (paramIndex == 0 ||
EPI.ExtParameterInfos[paramIndex - 1].getABI()
!= ParameterABI::SwiftContext) {
S.Diag(getParamLoc(paramIndex),
diag::err_swift_error_result_not_after_swift_context);
}
continue;
}
llvm_unreachable("bad ABI kind");
}
}
QualType Sema::BuildFunctionType(QualType T,
MutableArrayRef<QualType> ParamTypes,
SourceLocation Loc, DeclarationName Entity,
const FunctionProtoType::ExtProtoInfo &EPI) {
bool Invalid = false;
Invalid |= CheckFunctionReturnType(T, Loc);
for (unsigned Idx = 0, Cnt = ParamTypes.size(); Idx < Cnt; ++Idx) {
// FIXME: Loc is too inprecise here, should use proper locations for args.
QualType ParamType = Context.getAdjustedParameterType(ParamTypes[Idx]);
if (ParamType->isVoidType()) {
Diag(Loc, diag::err_param_with_void_type);
Invalid = true;
} else if (ParamType->isHalfType() && !getLangOpts().HalfArgsAndReturns) {
// Disallow half FP arguments.
Diag(Loc, diag::err_parameters_retval_cannot_have_fp16_type) << 0 <<
FixItHint::CreateInsertion(Loc, "*");
Invalid = true;
}
ParamTypes[Idx] = ParamType;
}
if (EPI.ExtParameterInfos) {
checkExtParameterInfos(*this, ParamTypes, EPI,
[=](unsigned i) { return Loc; });
}
if (Invalid)
return QualType();
return Context.getFunctionType(T, ParamTypes, EPI);
}
/// \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 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,
SourceLocation Loc,
DeclarationName Entity) {
// 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);
return QualType();
}
// C++ 8.3.3p3: A pointer to member shall not point to ... a member
// with reference type, or "cv void."
if (T->isReferenceType()) {
Diag(Loc, diag::err_illegal_decl_mempointer_to_reference)
<< getPrintableNameForEntity(Entity) << T;
return QualType();
}
if (T->isVoidType()) {
Diag(Loc, diag::err_illegal_decl_mempointer_to_void)
<< getPrintableNameForEntity(Entity);
return QualType();
}
if (!Class->isDependentType() && !Class->isRecordType()) {
Diag(Loc, diag::err_mempointer_in_nonclass_type) << Class;
return QualType();
}
// Adjust the default free function calling convention to the default method
// calling convention.
bool IsCtorOrDtor =
(Entity.getNameKind() == DeclarationName::CXXConstructorName) ||
(Entity.getNameKind() == DeclarationName::CXXDestructorName);
if (T->isFunctionType())
adjustMemberFunctionCC(T, /*IsStatic=*/false, IsCtorOrDtor, Loc);
return Context.getMemberPointerType(T, Class.getTypePtr());
}
/// \brief Build a block pointer type.
///
/// \param T The type to which we'll be building a block pointer.
///
/// \param Loc The source location, used for diagnostics.
///
/// \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,
SourceLocation Loc,
DeclarationName Entity) {
if (!T->isFunctionType()) {
Diag(Loc, diag::err_nonfunction_block_type);
return QualType();
}
if (checkQualifiedFunction(*this, T, Loc, QFK_BlockPointer))
return QualType();
return Context.getBlockPointerType(T);
}
QualType Sema::GetTypeFromParser(ParsedType Ty, TypeSourceInfo **TInfo) {
QualType QT = Ty.get();
if (QT.isNull()) {
if (TInfo) *TInfo = nullptr;
return QualType();
}
TypeSourceInfo *DI = nullptr;
if (const LocInfoType *LIT = dyn_cast<LocInfoType>(QT)) {
QT = LIT->getType();
DI = LIT->getTypeSourceInfo();
}
if (TInfo) *TInfo = DI;
return QT;
}
static void transferARCOwnershipToDeclaratorChunk(TypeProcessingState &state,
Qualifiers::ObjCLifetime ownership,
unsigned chunkIndex);
/// Given that this is the declaration of a parameter under ARC,
/// attempt to infer attributes and such for pointer-to-whatever
/// types.
static void inferARCWriteback(TypeProcessingState &state,
QualType &declSpecType) {
Sema &S = state.getSema();
Declarator &declarator = state.getDeclarator();
// TODO: should we care about decl qualifiers?
// Check whether the declarator has the expected form. We walk
// from the inside out in order to make the block logic work.
unsigned outermostPointerIndex = 0;
bool isBlockPointer = false;
unsigned numPointers = 0;
for (unsigned i = 0, e = declarator.getNumTypeObjects(); i != e; ++i) {
unsigned chunkIndex = i;
DeclaratorChunk &chunk = declarator.getTypeObject(chunkIndex);
switch (chunk.Kind) {
case DeclaratorChunk::Paren:
// Ignore parens.
break;
case DeclaratorChunk::Reference:
case DeclaratorChunk::Pointer:
// Count the number of pointers. Treat references
// interchangeably as pointers; if they're mis-ordered, normal
// type building will discover that.
outermostPointerIndex = chunkIndex;
numPointers++;
break;
case DeclaratorChunk::BlockPointer:
// If we have a pointer to block pointer, that's an acceptable
// indirect reference; anything else is not an application of
// the rules.
if (numPointers != 1) return;
numPointers++;
outermostPointerIndex = chunkIndex;
isBlockPointer = true;
// We don't care about pointer structure in return values here.
goto done;
case DeclaratorChunk::Array: // suppress if written (id[])?
case DeclaratorChunk::Function:
case DeclaratorChunk::MemberPointer:
case DeclaratorChunk::Pipe:
return;
}
}
done:
// If we have *one* pointer, then we want to throw the qualifier on
// the declaration-specifiers, which means that it needs to be a
// retainable object type.
if (numPointers == 1) {
// If it's not a retainable object type, the rule doesn't apply.
if (!declSpecType->isObjCRetainableType()) return;
// If it already has lifetime, don't do anything.
if (declSpecType.getObjCLifetime()) return;
// Otherwise, modify the type in-place.
Qualifiers qs;
if (declSpecType->isObjCARCImplicitlyUnretainedType())
qs.addObjCLifetime(Qualifiers::OCL_ExplicitNone);
else
qs.addObjCLifetime(Qualifiers::OCL_Autoreleasing);
declSpecType = S.Context.getQualifiedType(declSpecType, qs);
// If we have *two* pointers, then we want to throw the qualifier on
// the outermost pointer.
} else if (numPointers == 2) {
// If we don't have a block pointer, we need to check whether the
// declaration-specifiers gave us something that will turn into a
// retainable object pointer after we slap the first pointer on it.
if (!isBlockPointer && !declSpecType->isObjCObjectType())
return;
// Look for an explicit lifetime attribute there.
DeclaratorChunk &chunk = declarator.getTypeObject(outermostPointerIndex);
if (chunk.Kind != DeclaratorChunk::Pointer &&
chunk.Kind != DeclaratorChunk::BlockPointer)
return;
for (const AttributeList *attr = chunk.getAttrs(); attr;
attr = attr->getNext())
if (attr->getKind() == AttributeList::AT_ObjCOwnership)