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llvm-project/clang/lib/Sema/SemaExprObjC.cpp
John McCall 351762cda2 A few more tweaks to the blocks AST representation: 
- BlockDeclRefExprs always store VarDecls
  - BDREs no longer store copy expressions
  - BlockDecls now store a list of captured variables, information about
    how they're captured, and a copy expression if necessary
    
With that in hand, change IR generation to use the captures data in       
blocks instead of walking the block independently.        

Additionally, optimize block layout by emitting fields in descending
alignment order, with a heuristic for filling in words when alignment
of the end of the block header is insufficient for the most aligned
field.

llvm-svn: 125005
2011-02-07 10:33:21 +00:00

1191 lines
48 KiB
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//===--- SemaExprObjC.cpp - Semantic Analysis for ObjC Expressions --------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements semantic analysis for Objective-C expressions.
//
//===----------------------------------------------------------------------===//
#include "clang/Sema/SemaInternal.h"
#include "clang/Sema/Lookup.h"
#include "clang/Sema/Scope.h"
#include "clang/Sema/ScopeInfo.h"
#include "clang/Sema/Initialization.h"
#include "clang/AST/ASTContext.h"
#include "clang/AST/DeclObjC.h"
#include "clang/AST/ExprObjC.h"
#include "clang/AST/TypeLoc.h"
#include "llvm/ADT/SmallString.h"
#include "clang/Lex/Preprocessor.h"
using namespace clang;
using namespace sema;
ExprResult Sema::ParseObjCStringLiteral(SourceLocation *AtLocs,
Expr **strings,
unsigned NumStrings) {
StringLiteral **Strings = reinterpret_cast<StringLiteral**>(strings);
// Most ObjC strings are formed out of a single piece. However, we *can*
// have strings formed out of multiple @ strings with multiple pptokens in
// each one, e.g. @"foo" "bar" @"baz" "qux" which need to be turned into one
// StringLiteral for ObjCStringLiteral to hold onto.
StringLiteral *S = Strings[0];
// If we have a multi-part string, merge it all together.
if (NumStrings != 1) {
// Concatenate objc strings.
llvm::SmallString<128> StrBuf;
llvm::SmallVector<SourceLocation, 8> StrLocs;
for (unsigned i = 0; i != NumStrings; ++i) {
S = Strings[i];
// ObjC strings can't be wide.
if (S->isWide()) {
Diag(S->getLocStart(), diag::err_cfstring_literal_not_string_constant)
<< S->getSourceRange();
return true;
}
// Append the string.
StrBuf += S->getString();
// Get the locations of the string tokens.
StrLocs.append(S->tokloc_begin(), S->tokloc_end());
}
// Create the aggregate string with the appropriate content and location
// information.
S = StringLiteral::Create(Context, &StrBuf[0], StrBuf.size(), false,
Context.getPointerType(Context.CharTy),
&StrLocs[0], StrLocs.size());
}
// Verify that this composite string is acceptable for ObjC strings.
if (CheckObjCString(S))
return true;
// Initialize the constant string interface lazily. This assumes
// the NSString interface is seen in this translation unit. Note: We
// don't use NSConstantString, since the runtime team considers this
// interface private (even though it appears in the header files).
QualType Ty = Context.getObjCConstantStringInterface();
if (!Ty.isNull()) {
Ty = Context.getObjCObjectPointerType(Ty);
} else if (getLangOptions().NoConstantCFStrings) {
IdentifierInfo *NSIdent=0;
std::string StringClass(getLangOptions().ObjCConstantStringClass);
if (StringClass.empty())
NSIdent = &Context.Idents.get("NSConstantString");
else
NSIdent = &Context.Idents.get(StringClass);
NamedDecl *IF = LookupSingleName(TUScope, NSIdent, AtLocs[0],
LookupOrdinaryName);
if (ObjCInterfaceDecl *StrIF = dyn_cast_or_null<ObjCInterfaceDecl>(IF)) {
Context.setObjCConstantStringInterface(StrIF);
Ty = Context.getObjCConstantStringInterface();
Ty = Context.getObjCObjectPointerType(Ty);
} else {
// If there is no NSConstantString interface defined then treat this
// as error and recover from it.
Diag(S->getLocStart(), diag::err_no_nsconstant_string_class) << NSIdent
<< S->getSourceRange();
Ty = Context.getObjCIdType();
}
} else {
IdentifierInfo *NSIdent = &Context.Idents.get("NSString");
NamedDecl *IF = LookupSingleName(TUScope, NSIdent, AtLocs[0],
LookupOrdinaryName);
if (ObjCInterfaceDecl *StrIF = dyn_cast_or_null<ObjCInterfaceDecl>(IF)) {
Context.setObjCConstantStringInterface(StrIF);
Ty = Context.getObjCConstantStringInterface();
Ty = Context.getObjCObjectPointerType(Ty);
} else {
// If there is no NSString interface defined then treat constant
// strings as untyped objects and let the runtime figure it out later.
Ty = Context.getObjCIdType();
}
}
return new (Context) ObjCStringLiteral(S, Ty, AtLocs[0]);
}
Expr *Sema::BuildObjCEncodeExpression(SourceLocation AtLoc,
TypeSourceInfo *EncodedTypeInfo,
SourceLocation RParenLoc) {
QualType EncodedType = EncodedTypeInfo->getType();
QualType StrTy;
if (EncodedType->isDependentType())
StrTy = Context.DependentTy;
else {
std::string Str;
Context.getObjCEncodingForType(EncodedType, Str);
// The type of @encode is the same as the type of the corresponding string,
// which is an array type.
StrTy = Context.CharTy;
// A C++ string literal has a const-qualified element type (C++ 2.13.4p1).
if (getLangOptions().CPlusPlus || getLangOptions().ConstStrings)
StrTy.addConst();
StrTy = Context.getConstantArrayType(StrTy, llvm::APInt(32, Str.size()+1),
ArrayType::Normal, 0);
}
return new (Context) ObjCEncodeExpr(StrTy, EncodedTypeInfo, AtLoc, RParenLoc);
}
ExprResult Sema::ParseObjCEncodeExpression(SourceLocation AtLoc,
SourceLocation EncodeLoc,
SourceLocation LParenLoc,
ParsedType ty,
SourceLocation RParenLoc) {
// FIXME: Preserve type source info ?
TypeSourceInfo *TInfo;
QualType EncodedType = GetTypeFromParser(ty, &TInfo);
if (!TInfo)
TInfo = Context.getTrivialTypeSourceInfo(EncodedType,
PP.getLocForEndOfToken(LParenLoc));
return BuildObjCEncodeExpression(AtLoc, TInfo, RParenLoc);
}
ExprResult Sema::ParseObjCSelectorExpression(Selector Sel,
SourceLocation AtLoc,
SourceLocation SelLoc,
SourceLocation LParenLoc,
SourceLocation RParenLoc) {
ObjCMethodDecl *Method = LookupInstanceMethodInGlobalPool(Sel,
SourceRange(LParenLoc, RParenLoc), false, false);
if (!Method)
Method = LookupFactoryMethodInGlobalPool(Sel,
SourceRange(LParenLoc, RParenLoc));
if (!Method)
Diag(SelLoc, diag::warn_undeclared_selector) << Sel;
llvm::DenseMap<Selector, SourceLocation>::iterator Pos
= ReferencedSelectors.find(Sel);
if (Pos == ReferencedSelectors.end())
ReferencedSelectors.insert(std::make_pair(Sel, SelLoc));
QualType Ty = Context.getObjCSelType();
return new (Context) ObjCSelectorExpr(Ty, Sel, AtLoc, RParenLoc);
}
ExprResult Sema::ParseObjCProtocolExpression(IdentifierInfo *ProtocolId,
SourceLocation AtLoc,
SourceLocation ProtoLoc,
SourceLocation LParenLoc,
SourceLocation RParenLoc) {
ObjCProtocolDecl* PDecl = LookupProtocol(ProtocolId, ProtoLoc);
if (!PDecl) {
Diag(ProtoLoc, diag::err_undeclared_protocol) << ProtocolId;
return true;
}
QualType Ty = Context.getObjCProtoType();
if (Ty.isNull())
return true;
Ty = Context.getObjCObjectPointerType(Ty);
return new (Context) ObjCProtocolExpr(Ty, PDecl, AtLoc, RParenLoc);
}
/// Try to capture an implicit reference to 'self'.
ObjCMethodDecl *Sema::tryCaptureObjCSelf() {
// Ignore block scopes: we can capture through them.
DeclContext *DC = CurContext;
while (true) {
if (isa<BlockDecl>(DC)) DC = cast<BlockDecl>(DC)->getDeclContext();
else if (isa<EnumDecl>(DC)) DC = cast<EnumDecl>(DC)->getDeclContext();
else break;
}
// If we're not in an ObjC method, error out. Note that, unlike the
// C++ case, we don't require an instance method --- class methods
// still have a 'self', and we really do still need to capture it!
ObjCMethodDecl *method = dyn_cast<ObjCMethodDecl>(DC);
if (!method)
return 0;
ImplicitParamDecl *self = method->getSelfDecl();
assert(self && "capturing 'self' in non-definition?");
// Mark that we're closing on 'this' in all the block scopes, if applicable.
for (unsigned idx = FunctionScopes.size() - 1;
isa<BlockScopeInfo>(FunctionScopes[idx]);
--idx) {
BlockScopeInfo *blockScope = cast<BlockScopeInfo>(FunctionScopes[idx]);
unsigned &captureIndex = blockScope->CaptureMap[self];
if (captureIndex) break;
bool nested = isa<BlockScopeInfo>(FunctionScopes[idx-1]);
blockScope->Captures.push_back(
BlockDecl::Capture(self, /*byref*/ false, nested, /*copy*/ 0));
captureIndex = blockScope->Captures.size(); // +1
}
return method;
}
bool Sema::CheckMessageArgumentTypes(Expr **Args, unsigned NumArgs,
Selector Sel, ObjCMethodDecl *Method,
bool isClassMessage,
SourceLocation lbrac, SourceLocation rbrac,
QualType &ReturnType, ExprValueKind &VK) {
if (!Method) {
// Apply default argument promotion as for (C99 6.5.2.2p6).
for (unsigned i = 0; i != NumArgs; i++) {
if (Args[i]->isTypeDependent())
continue;
DefaultArgumentPromotion(Args[i]);
}
unsigned DiagID = isClassMessage ? diag::warn_class_method_not_found :
diag::warn_inst_method_not_found;
Diag(lbrac, DiagID)
<< Sel << isClassMessage << SourceRange(lbrac, rbrac);
ReturnType = Context.getObjCIdType();
VK = VK_RValue;
return false;
}
ReturnType = Method->getSendResultType();
VK = Expr::getValueKindForType(Method->getResultType());
unsigned NumNamedArgs = Sel.getNumArgs();
// Method might have more arguments than selector indicates. This is due
// to addition of c-style arguments in method.
if (Method->param_size() > Sel.getNumArgs())
NumNamedArgs = Method->param_size();
// FIXME. This need be cleaned up.
if (NumArgs < NumNamedArgs) {
Diag(lbrac, diag::err_typecheck_call_too_few_args)
<< 2 << NumNamedArgs << NumArgs;
return false;
}
bool IsError = false;
for (unsigned i = 0; i < NumNamedArgs; i++) {
// We can't do any type-checking on a type-dependent argument.
if (Args[i]->isTypeDependent())
continue;
Expr *argExpr = Args[i];
ParmVarDecl *Param = Method->param_begin()[i];
assert(argExpr && "CheckMessageArgumentTypes(): missing expression");
if (RequireCompleteType(argExpr->getSourceRange().getBegin(),
Param->getType(),
PDiag(diag::err_call_incomplete_argument)
<< argExpr->getSourceRange()))
return true;
InitializedEntity Entity = InitializedEntity::InitializeParameter(Context,
Param);
ExprResult ArgE = PerformCopyInitialization(Entity, lbrac, Owned(argExpr));
if (ArgE.isInvalid())
IsError = true;
else
Args[i] = ArgE.takeAs<Expr>();
}
// Promote additional arguments to variadic methods.
if (Method->isVariadic()) {
for (unsigned i = NumNamedArgs; i < NumArgs; ++i) {
if (Args[i]->isTypeDependent())
continue;
IsError |= DefaultVariadicArgumentPromotion(Args[i], VariadicMethod, 0);
}
} else {
// Check for extra arguments to non-variadic methods.
if (NumArgs != NumNamedArgs) {
Diag(Args[NumNamedArgs]->getLocStart(),
diag::err_typecheck_call_too_many_args)
<< 2 /*method*/ << NumNamedArgs << NumArgs
<< Method->getSourceRange()
<< SourceRange(Args[NumNamedArgs]->getLocStart(),
Args[NumArgs-1]->getLocEnd());
}
}
DiagnoseSentinelCalls(Method, lbrac, Args, NumArgs);
return IsError;
}
bool Sema::isSelfExpr(Expr *RExpr) {
if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(RExpr))
if (ICE->getCastKind() == CK_LValueToRValue)
RExpr = ICE->getSubExpr();
if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(RExpr))
if (DRE->getDecl()->getIdentifier() == &Context.Idents.get("self"))
return true;
return false;
}
// Helper method for ActOnClassMethod/ActOnInstanceMethod.
// Will search "local" class/category implementations for a method decl.
// If failed, then we search in class's root for an instance method.
// Returns 0 if no method is found.
ObjCMethodDecl *Sema::LookupPrivateClassMethod(Selector Sel,
ObjCInterfaceDecl *ClassDecl) {
ObjCMethodDecl *Method = 0;
// lookup in class and all superclasses
while (ClassDecl && !Method) {
if (ObjCImplementationDecl *ImpDecl = ClassDecl->getImplementation())
Method = ImpDecl->getClassMethod(Sel);
// Look through local category implementations associated with the class.
if (!Method)
Method = ClassDecl->getCategoryClassMethod(Sel);
// Before we give up, check if the selector is an instance method.
// But only in the root. This matches gcc's behaviour and what the
// runtime expects.
if (!Method && !ClassDecl->getSuperClass()) {
Method = ClassDecl->lookupInstanceMethod(Sel);
// Look through local category implementations associated
// with the root class.
if (!Method)
Method = LookupPrivateInstanceMethod(Sel, ClassDecl);
}
ClassDecl = ClassDecl->getSuperClass();
}
return Method;
}
ObjCMethodDecl *Sema::LookupPrivateInstanceMethod(Selector Sel,
ObjCInterfaceDecl *ClassDecl) {
ObjCMethodDecl *Method = 0;
while (ClassDecl && !Method) {
// If we have implementations in scope, check "private" methods.
if (ObjCImplementationDecl *ImpDecl = ClassDecl->getImplementation())
Method = ImpDecl->getInstanceMethod(Sel);
// Look through local category implementations associated with the class.
if (!Method)
Method = ClassDecl->getCategoryInstanceMethod(Sel);
ClassDecl = ClassDecl->getSuperClass();
}
return Method;
}
/// HandleExprPropertyRefExpr - Handle foo.bar where foo is a pointer to an
/// objective C interface. This is a property reference expression.
ExprResult Sema::
HandleExprPropertyRefExpr(const ObjCObjectPointerType *OPT,
Expr *BaseExpr, DeclarationName MemberName,
SourceLocation MemberLoc,
SourceLocation SuperLoc, QualType SuperType,
bool Super) {
const ObjCInterfaceType *IFaceT = OPT->getInterfaceType();
ObjCInterfaceDecl *IFace = IFaceT->getDecl();
IdentifierInfo *Member = MemberName.getAsIdentifierInfo();
if (IFace->isForwardDecl()) {
Diag(MemberLoc, diag::err_property_not_found_forward_class)
<< MemberName << QualType(OPT, 0);
Diag(IFace->getLocation(), diag::note_forward_class);
return ExprError();
}
// Search for a declared property first.
if (ObjCPropertyDecl *PD = IFace->FindPropertyDeclaration(Member)) {
// Check whether we can reference this property.
if (DiagnoseUseOfDecl(PD, MemberLoc))
return ExprError();
QualType ResTy = PD->getType();
Selector Sel = PP.getSelectorTable().getNullarySelector(Member);
ObjCMethodDecl *Getter = IFace->lookupInstanceMethod(Sel);
if (DiagnosePropertyAccessorMismatch(PD, Getter, MemberLoc))
ResTy = Getter->getResultType();
if (Super)
return Owned(new (Context) ObjCPropertyRefExpr(PD, ResTy,
VK_LValue, OK_ObjCProperty,
MemberLoc,
SuperLoc, SuperType));
else
return Owned(new (Context) ObjCPropertyRefExpr(PD, ResTy,
VK_LValue, OK_ObjCProperty,
MemberLoc, BaseExpr));
}
// Check protocols on qualified interfaces.
for (ObjCObjectPointerType::qual_iterator I = OPT->qual_begin(),
E = OPT->qual_end(); I != E; ++I)
if (ObjCPropertyDecl *PD = (*I)->FindPropertyDeclaration(Member)) {
// Check whether we can reference this property.
if (DiagnoseUseOfDecl(PD, MemberLoc))
return ExprError();
if (Super)
return Owned(new (Context) ObjCPropertyRefExpr(PD, PD->getType(),
VK_LValue,
OK_ObjCProperty,
MemberLoc,
SuperLoc, SuperType));
else
return Owned(new (Context) ObjCPropertyRefExpr(PD, PD->getType(),
VK_LValue,
OK_ObjCProperty,
MemberLoc,
BaseExpr));
}
// If that failed, look for an "implicit" property by seeing if the nullary
// selector is implemented.
// FIXME: The logic for looking up nullary and unary selectors should be
// shared with the code in ActOnInstanceMessage.
Selector Sel = PP.getSelectorTable().getNullarySelector(Member);
ObjCMethodDecl *Getter = IFace->lookupInstanceMethod(Sel);
// If this reference is in an @implementation, check for 'private' methods.
if (!Getter)
Getter = IFace->lookupPrivateMethod(Sel);
// Look through local category implementations associated with the class.
if (!Getter)
Getter = IFace->getCategoryInstanceMethod(Sel);
if (Getter) {
// Check if we can reference this property.
if (DiagnoseUseOfDecl(Getter, MemberLoc))
return ExprError();
}
// If we found a getter then this may be a valid dot-reference, we
// will look for the matching setter, in case it is needed.
Selector SetterSel =
SelectorTable::constructSetterName(PP.getIdentifierTable(),
PP.getSelectorTable(), Member);
ObjCMethodDecl *Setter = IFace->lookupInstanceMethod(SetterSel);
if (!Setter) {
// If this reference is in an @implementation, also check for 'private'
// methods.
Setter = IFace->lookupPrivateMethod(SetterSel);
}
// Look through local category implementations associated with the class.
if (!Setter)
Setter = IFace->getCategoryInstanceMethod(SetterSel);
if (Setter && DiagnoseUseOfDecl(Setter, MemberLoc))
return ExprError();
if (Getter || Setter) {
QualType PType;
if (Getter)
PType = Getter->getSendResultType();
else {
ParmVarDecl *ArgDecl = *Setter->param_begin();
PType = ArgDecl->getType();
}
ExprValueKind VK = VK_LValue;
ExprObjectKind OK = OK_ObjCProperty;
if (!getLangOptions().CPlusPlus && !PType.hasQualifiers() &&
PType->isVoidType())
VK = VK_RValue, OK = OK_Ordinary;
if (Super)
return Owned(new (Context) ObjCPropertyRefExpr(Getter, Setter,
PType, VK, OK,
MemberLoc,
SuperLoc, SuperType));
else
return Owned(new (Context) ObjCPropertyRefExpr(Getter, Setter,
PType, VK, OK,
MemberLoc, BaseExpr));
}
// Attempt to correct for typos in property names.
LookupResult Res(*this, MemberName, MemberLoc, LookupOrdinaryName);
if (CorrectTypo(Res, 0, 0, IFace, false, CTC_NoKeywords, OPT) &&
Res.getAsSingle<ObjCPropertyDecl>()) {
DeclarationName TypoResult = Res.getLookupName();
Diag(MemberLoc, diag::err_property_not_found_suggest)
<< MemberName << QualType(OPT, 0) << TypoResult
<< FixItHint::CreateReplacement(MemberLoc, TypoResult.getAsString());
ObjCPropertyDecl *Property = Res.getAsSingle<ObjCPropertyDecl>();
Diag(Property->getLocation(), diag::note_previous_decl)
<< Property->getDeclName();
return HandleExprPropertyRefExpr(OPT, BaseExpr, TypoResult, MemberLoc,
SuperLoc, SuperType, Super);
}
Diag(MemberLoc, diag::err_property_not_found)
<< MemberName << QualType(OPT, 0);
if (Setter)
Diag(Setter->getLocation(), diag::note_getter_unavailable)
<< MemberName << BaseExpr->getSourceRange();
return ExprError();
}
ExprResult Sema::
ActOnClassPropertyRefExpr(IdentifierInfo &receiverName,
IdentifierInfo &propertyName,
SourceLocation receiverNameLoc,
SourceLocation propertyNameLoc) {
IdentifierInfo *receiverNamePtr = &receiverName;
ObjCInterfaceDecl *IFace = getObjCInterfaceDecl(receiverNamePtr,
receiverNameLoc);
if (IFace == 0) {
// If the "receiver" is 'super' in a method, handle it as an expression-like
// property reference.
if (receiverNamePtr->isStr("super")) {
if (ObjCMethodDecl *CurMethod = tryCaptureObjCSelf()) {
if (CurMethod->isInstanceMethod()) {
QualType T =
Context.getObjCInterfaceType(CurMethod->getClassInterface());
T = Context.getObjCObjectPointerType(T);
return HandleExprPropertyRefExpr(T->getAsObjCInterfacePointerType(),
/*BaseExpr*/0, &propertyName,
propertyNameLoc,
receiverNameLoc, T, true);
}
// Otherwise, if this is a class method, try dispatching to our
// superclass.
IFace = CurMethod->getClassInterface()->getSuperClass();
}
}
if (IFace == 0) {
Diag(receiverNameLoc, diag::err_expected_ident_or_lparen);
return ExprError();
}
}
// Search for a declared property first.
Selector Sel = PP.getSelectorTable().getNullarySelector(&propertyName);
ObjCMethodDecl *Getter = IFace->lookupClassMethod(Sel);
// If this reference is in an @implementation, check for 'private' methods.
if (!Getter)
if (ObjCMethodDecl *CurMeth = getCurMethodDecl())
if (ObjCInterfaceDecl *ClassDecl = CurMeth->getClassInterface())
if (ObjCImplementationDecl *ImpDecl = ClassDecl->getImplementation())
Getter = ImpDecl->getClassMethod(Sel);
if (Getter) {
// FIXME: refactor/share with ActOnMemberReference().
// Check if we can reference this property.
if (DiagnoseUseOfDecl(Getter, propertyNameLoc))
return ExprError();
}
// Look for the matching setter, in case it is needed.
Selector SetterSel =
SelectorTable::constructSetterName(PP.getIdentifierTable(),
PP.getSelectorTable(), &propertyName);
ObjCMethodDecl *Setter = IFace->lookupClassMethod(SetterSel);
if (!Setter) {
// If this reference is in an @implementation, also check for 'private'
// methods.
if (ObjCMethodDecl *CurMeth = getCurMethodDecl())
if (ObjCInterfaceDecl *ClassDecl = CurMeth->getClassInterface())
if (ObjCImplementationDecl *ImpDecl = ClassDecl->getImplementation())
Setter = ImpDecl->getClassMethod(SetterSel);
}
// Look through local category implementations associated with the class.
if (!Setter)
Setter = IFace->getCategoryClassMethod(SetterSel);
if (Setter && DiagnoseUseOfDecl(Setter, propertyNameLoc))
return ExprError();
if (Getter || Setter) {
QualType PType;
ExprValueKind VK = VK_LValue;
if (Getter) {
PType = Getter->getSendResultType();
if (!getLangOptions().CPlusPlus &&
!PType.hasQualifiers() && PType->isVoidType())
VK = VK_RValue;
} else {
for (ObjCMethodDecl::param_iterator PI = Setter->param_begin(),
E = Setter->param_end(); PI != E; ++PI)
PType = (*PI)->getType();
VK = VK_LValue;
}
ExprObjectKind OK = (VK == VK_RValue ? OK_Ordinary : OK_ObjCProperty);
return Owned(new (Context) ObjCPropertyRefExpr(Getter, Setter,
PType, VK, OK,
propertyNameLoc,
receiverNameLoc, IFace));
}
return ExprError(Diag(propertyNameLoc, diag::err_property_not_found)
<< &propertyName << Context.getObjCInterfaceType(IFace));
}
Sema::ObjCMessageKind Sema::getObjCMessageKind(Scope *S,
IdentifierInfo *Name,
SourceLocation NameLoc,
bool IsSuper,
bool HasTrailingDot,
ParsedType &ReceiverType) {
ReceiverType = ParsedType();
// If the identifier is "super" and there is no trailing dot, we're
// messaging super. If the identifier is "super" and there is a
// trailing dot, it's an instance message.
if (IsSuper && S->isInObjcMethodScope())
return HasTrailingDot? ObjCInstanceMessage : ObjCSuperMessage;
LookupResult Result(*this, Name, NameLoc, LookupOrdinaryName);
LookupName(Result, S);
switch (Result.getResultKind()) {
case LookupResult::NotFound:
// Normal name lookup didn't find anything. If we're in an
// Objective-C method, look for ivars. If we find one, we're done!
// FIXME: This is a hack. Ivar lookup should be part of normal
// lookup.
if (ObjCMethodDecl *Method = getCurMethodDecl()) {
ObjCInterfaceDecl *ClassDeclared;
if (Method->getClassInterface()->lookupInstanceVariable(Name,
ClassDeclared))
return ObjCInstanceMessage;
}
// Break out; we'll perform typo correction below.
break;
case LookupResult::NotFoundInCurrentInstantiation:
case LookupResult::FoundOverloaded:
case LookupResult::FoundUnresolvedValue:
case LookupResult::Ambiguous:
Result.suppressDiagnostics();
return ObjCInstanceMessage;
case LookupResult::Found: {
// We found something. If it's a type, then we have a class
// message. Otherwise, it's an instance message.
NamedDecl *ND = Result.getFoundDecl();
QualType T;
if (ObjCInterfaceDecl *Class = dyn_cast<ObjCInterfaceDecl>(ND))
T = Context.getObjCInterfaceType(Class);
else if (TypeDecl *Type = dyn_cast<TypeDecl>(ND))
T = Context.getTypeDeclType(Type);
else
return ObjCInstanceMessage;
// We have a class message, and T is the type we're
// messaging. Build source-location information for it.
TypeSourceInfo *TSInfo = Context.getTrivialTypeSourceInfo(T, NameLoc);
ReceiverType = CreateParsedType(T, TSInfo);
return ObjCClassMessage;
}
}
// Determine our typo-correction context.
CorrectTypoContext CTC = CTC_Expression;
if (ObjCMethodDecl *Method = getCurMethodDecl())
if (Method->getClassInterface() &&
Method->getClassInterface()->getSuperClass())
CTC = CTC_ObjCMessageReceiver;
if (DeclarationName Corrected = CorrectTypo(Result, S, 0, 0, false, CTC)) {
if (Result.isSingleResult()) {
// If we found a declaration, correct when it refers to an Objective-C
// class.
NamedDecl *ND = Result.getFoundDecl();
if (ObjCInterfaceDecl *Class = dyn_cast<ObjCInterfaceDecl>(ND)) {
Diag(NameLoc, diag::err_unknown_receiver_suggest)
<< Name << Result.getLookupName()
<< FixItHint::CreateReplacement(SourceRange(NameLoc),
ND->getNameAsString());
Diag(ND->getLocation(), diag::note_previous_decl)
<< Corrected;
QualType T = Context.getObjCInterfaceType(Class);
TypeSourceInfo *TSInfo = Context.getTrivialTypeSourceInfo(T, NameLoc);
ReceiverType = CreateParsedType(T, TSInfo);
return ObjCClassMessage;
}
} else if (Result.empty() && Corrected.getAsIdentifierInfo() &&
Corrected.getAsIdentifierInfo()->isStr("super")) {
// If we've found the keyword "super", this is a send to super.
Diag(NameLoc, diag::err_unknown_receiver_suggest)
<< Name << Corrected
<< FixItHint::CreateReplacement(SourceRange(NameLoc), "super");
return ObjCSuperMessage;
}
}
// Fall back: let the parser try to parse it as an instance message.
return ObjCInstanceMessage;
}
ExprResult Sema::ActOnSuperMessage(Scope *S,
SourceLocation SuperLoc,
Selector Sel,
SourceLocation LBracLoc,
SourceLocation SelectorLoc,
SourceLocation RBracLoc,
MultiExprArg Args) {
// Determine whether we are inside a method or not.
ObjCMethodDecl *Method = tryCaptureObjCSelf();
if (!Method) {
Diag(SuperLoc, diag::err_invalid_receiver_to_message_super);
return ExprError();
}
ObjCInterfaceDecl *Class = Method->getClassInterface();
if (!Class) {
Diag(SuperLoc, diag::error_no_super_class_message)
<< Method->getDeclName();
return ExprError();
}
ObjCInterfaceDecl *Super = Class->getSuperClass();
if (!Super) {
// The current class does not have a superclass.
Diag(SuperLoc, diag::error_root_class_cannot_use_super)
<< Class->getIdentifier();
return ExprError();
}
// We are in a method whose class has a superclass, so 'super'
// is acting as a keyword.
if (Method->isInstanceMethod()) {
// Since we are in an instance method, this is an instance
// message to the superclass instance.
QualType SuperTy = Context.getObjCInterfaceType(Super);
SuperTy = Context.getObjCObjectPointerType(SuperTy);
return BuildInstanceMessage(0, SuperTy, SuperLoc,
Sel, /*Method=*/0,
LBracLoc, SelectorLoc, RBracLoc, move(Args));
}
// Since we are in a class method, this is a class message to
// the superclass.
return BuildClassMessage(/*ReceiverTypeInfo=*/0,
Context.getObjCInterfaceType(Super),
SuperLoc, Sel, /*Method=*/0,
LBracLoc, SelectorLoc, RBracLoc, move(Args));
}
/// \brief Build an Objective-C class message expression.
///
/// This routine takes care of both normal class messages and
/// class messages to the superclass.
///
/// \param ReceiverTypeInfo Type source information that describes the
/// receiver of this message. This may be NULL, in which case we are
/// sending to the superclass and \p SuperLoc must be a valid source
/// location.
/// \param ReceiverType The type of the object receiving the
/// message. When \p ReceiverTypeInfo is non-NULL, this is the same
/// type as that refers to. For a superclass send, this is the type of
/// the superclass.
///
/// \param SuperLoc The location of the "super" keyword in a
/// superclass message.
///
/// \param Sel The selector to which the message is being sent.
///
/// \param Method The method that this class message is invoking, if
/// already known.
///
/// \param LBracLoc The location of the opening square bracket ']'.
///
/// \param RBrac The location of the closing square bracket ']'.
///
/// \param Args The message arguments.
ExprResult Sema::BuildClassMessage(TypeSourceInfo *ReceiverTypeInfo,
QualType ReceiverType,
SourceLocation SuperLoc,
Selector Sel,
ObjCMethodDecl *Method,
SourceLocation LBracLoc,
SourceLocation SelectorLoc,
SourceLocation RBracLoc,
MultiExprArg ArgsIn) {
SourceLocation Loc = SuperLoc.isValid()? SuperLoc
: ReceiverTypeInfo->getTypeLoc().getSourceRange().getBegin();
if (LBracLoc.isInvalid()) {
Diag(Loc, diag::err_missing_open_square_message_send)
<< FixItHint::CreateInsertion(Loc, "[");
LBracLoc = Loc;
}
if (ReceiverType->isDependentType()) {
// If the receiver type is dependent, we can't type-check anything
// at this point. Build a dependent expression.
unsigned NumArgs = ArgsIn.size();
Expr **Args = reinterpret_cast<Expr **>(ArgsIn.release());
assert(SuperLoc.isInvalid() && "Message to super with dependent type");
return Owned(ObjCMessageExpr::Create(Context, ReceiverType,
VK_RValue, LBracLoc, ReceiverTypeInfo,
Sel, SelectorLoc, /*Method=*/0,
Args, NumArgs, RBracLoc));
}
// Find the class to which we are sending this message.
ObjCInterfaceDecl *Class = 0;
const ObjCObjectType *ClassType = ReceiverType->getAs<ObjCObjectType>();
if (!ClassType || !(Class = ClassType->getInterface())) {
Diag(Loc, diag::err_invalid_receiver_class_message)
<< ReceiverType;
return ExprError();
}
assert(Class && "We don't know which class we're messaging?");
// Find the method we are messaging.
if (!Method) {
if (Class->isForwardDecl()) {
// A forward class used in messaging is treated as a 'Class'
Diag(Loc, diag::warn_receiver_forward_class) << Class->getDeclName();
Method = LookupFactoryMethodInGlobalPool(Sel,
SourceRange(LBracLoc, RBracLoc));
if (Method)
Diag(Method->getLocation(), diag::note_method_sent_forward_class)
<< Method->getDeclName();
}
if (!Method)
Method = Class->lookupClassMethod(Sel);
// If we have an implementation in scope, check "private" methods.
if (!Method)
Method = LookupPrivateClassMethod(Sel, Class);
if (Method && DiagnoseUseOfDecl(Method, Loc))
return ExprError();
}
// Check the argument types and determine the result type.
QualType ReturnType;
ExprValueKind VK = VK_RValue;
unsigned NumArgs = ArgsIn.size();
Expr **Args = reinterpret_cast<Expr **>(ArgsIn.release());
if (CheckMessageArgumentTypes(Args, NumArgs, Sel, Method, true,
LBracLoc, RBracLoc, ReturnType, VK))
return ExprError();
if (Method && !Method->getResultType()->isVoidType() &&
RequireCompleteType(LBracLoc, Method->getResultType(),
diag::err_illegal_message_expr_incomplete_type))
return ExprError();
// Construct the appropriate ObjCMessageExpr.
Expr *Result;
if (SuperLoc.isValid())
Result = ObjCMessageExpr::Create(Context, ReturnType, VK, LBracLoc,
SuperLoc, /*IsInstanceSuper=*/false,
ReceiverType, Sel, SelectorLoc,
Method, Args, NumArgs, RBracLoc);
else
Result = ObjCMessageExpr::Create(Context, ReturnType, VK, LBracLoc,
ReceiverTypeInfo, Sel, SelectorLoc,
Method, Args, NumArgs, RBracLoc);
return MaybeBindToTemporary(Result);
}
// ActOnClassMessage - used for both unary and keyword messages.
// ArgExprs is optional - if it is present, the number of expressions
// is obtained from Sel.getNumArgs().
ExprResult Sema::ActOnClassMessage(Scope *S,
ParsedType Receiver,
Selector Sel,
SourceLocation LBracLoc,
SourceLocation SelectorLoc,
SourceLocation RBracLoc,
MultiExprArg Args) {
TypeSourceInfo *ReceiverTypeInfo;
QualType ReceiverType = GetTypeFromParser(Receiver, &ReceiverTypeInfo);
if (ReceiverType.isNull())
return ExprError();
if (!ReceiverTypeInfo)
ReceiverTypeInfo = Context.getTrivialTypeSourceInfo(ReceiverType, LBracLoc);
return BuildClassMessage(ReceiverTypeInfo, ReceiverType,
/*SuperLoc=*/SourceLocation(), Sel, /*Method=*/0,
LBracLoc, SelectorLoc, RBracLoc, move(Args));
}
/// \brief Build an Objective-C instance message expression.
///
/// This routine takes care of both normal instance messages and
/// instance messages to the superclass instance.
///
/// \param Receiver The expression that computes the object that will
/// receive this message. This may be empty, in which case we are
/// sending to the superclass instance and \p SuperLoc must be a valid
/// source location.
///
/// \param ReceiverType The (static) type of the object receiving the
/// message. When a \p Receiver expression is provided, this is the
/// same type as that expression. For a superclass instance send, this
/// is a pointer to the type of the superclass.
///
/// \param SuperLoc The location of the "super" keyword in a
/// superclass instance message.
///
/// \param Sel The selector to which the message is being sent.
///
/// \param Method The method that this instance message is invoking, if
/// already known.
///
/// \param LBracLoc The location of the opening square bracket ']'.
///
/// \param RBrac The location of the closing square bracket ']'.
///
/// \param Args The message arguments.
ExprResult Sema::BuildInstanceMessage(Expr *Receiver,
QualType ReceiverType,
SourceLocation SuperLoc,
Selector Sel,
ObjCMethodDecl *Method,
SourceLocation LBracLoc,
SourceLocation SelectorLoc,
SourceLocation RBracLoc,
MultiExprArg ArgsIn) {
// The location of the receiver.
SourceLocation Loc = SuperLoc.isValid()? SuperLoc : Receiver->getLocStart();
if (LBracLoc.isInvalid()) {
Diag(Loc, diag::err_missing_open_square_message_send)
<< FixItHint::CreateInsertion(Loc, "[");
LBracLoc = Loc;
}
// If we have a receiver expression, perform appropriate promotions
// and determine receiver type.
if (Receiver) {
if (Receiver->isTypeDependent()) {
// If the receiver is type-dependent, we can't type-check anything
// at this point. Build a dependent expression.
unsigned NumArgs = ArgsIn.size();
Expr **Args = reinterpret_cast<Expr **>(ArgsIn.release());
assert(SuperLoc.isInvalid() && "Message to super with dependent type");
return Owned(ObjCMessageExpr::Create(Context, Context.DependentTy,
VK_RValue, LBracLoc, Receiver, Sel,
SelectorLoc, /*Method=*/0,
Args, NumArgs, RBracLoc));
}
// If necessary, apply function/array conversion to the receiver.
// C99 6.7.5.3p[7,8].
DefaultFunctionArrayLvalueConversion(Receiver);
ReceiverType = Receiver->getType();
}
if (!Method) {
// Handle messages to id.
bool receiverIsId = ReceiverType->isObjCIdType();
if (receiverIsId || ReceiverType->isBlockPointerType() ||
(Receiver && Context.isObjCNSObjectType(Receiver->getType()))) {
Method = LookupInstanceMethodInGlobalPool(Sel,
SourceRange(LBracLoc, RBracLoc),
receiverIsId);
if (!Method)
Method = LookupFactoryMethodInGlobalPool(Sel,
SourceRange(LBracLoc, RBracLoc),
receiverIsId);
} else if (ReceiverType->isObjCClassType() ||
ReceiverType->isObjCQualifiedClassType()) {
// Handle messages to Class.
if (ObjCMethodDecl *CurMeth = getCurMethodDecl()) {
if (ObjCInterfaceDecl *ClassDecl = CurMeth->getClassInterface()) {
// First check the public methods in the class interface.
Method = ClassDecl->lookupClassMethod(Sel);
if (!Method)
Method = LookupPrivateClassMethod(Sel, ClassDecl);
// FIXME: if we still haven't found a method, we need to look in
// protocols (if we have qualifiers).
}
if (Method && DiagnoseUseOfDecl(Method, Loc))
return ExprError();
}
if (!Method) {
// If not messaging 'self', look for any factory method named 'Sel'.
if (!Receiver || !isSelfExpr(Receiver)) {
Method = LookupFactoryMethodInGlobalPool(Sel,
SourceRange(LBracLoc, RBracLoc),
true);
if (!Method) {
// If no class (factory) method was found, check if an _instance_
// method of the same name exists in the root class only.
Method = LookupInstanceMethodInGlobalPool(Sel,
SourceRange(LBracLoc, RBracLoc),
true);
if (Method)
if (const ObjCInterfaceDecl *ID =
dyn_cast<ObjCInterfaceDecl>(Method->getDeclContext())) {
if (ID->getSuperClass())
Diag(Loc, diag::warn_root_inst_method_not_found)
<< Sel << SourceRange(LBracLoc, RBracLoc);
}
}
}
}
} else {
ObjCInterfaceDecl* ClassDecl = 0;
// We allow sending a message to a qualified ID ("id<foo>"), which is ok as
// long as one of the protocols implements the selector (if not, warn).
if (const ObjCObjectPointerType *QIdTy
= ReceiverType->getAsObjCQualifiedIdType()) {
// Search protocols for instance methods.
for (ObjCObjectPointerType::qual_iterator I = QIdTy->qual_begin(),
E = QIdTy->qual_end(); I != E; ++I) {
ObjCProtocolDecl *PDecl = *I;
if (PDecl && (Method = PDecl->lookupInstanceMethod(Sel)))
break;
// Since we aren't supporting "Class<foo>", look for a class method.
if (PDecl && (Method = PDecl->lookupClassMethod(Sel)))
break;
}
} else if (const ObjCObjectPointerType *OCIType
= ReceiverType->getAsObjCInterfacePointerType()) {
// We allow sending a message to a pointer to an interface (an object).
ClassDecl = OCIType->getInterfaceDecl();
// FIXME: consider using LookupInstanceMethodInGlobalPool, since it will be
// faster than the following method (which can do *many* linear searches).
// The idea is to add class info to MethodPool.
Method = ClassDecl->lookupInstanceMethod(Sel);
if (!Method) {
// Search protocol qualifiers.
for (ObjCObjectPointerType::qual_iterator QI = OCIType->qual_begin(),
E = OCIType->qual_end(); QI != E; ++QI) {
if ((Method = (*QI)->lookupInstanceMethod(Sel)))
break;
}
}
bool forwardClass = false;
if (!Method) {
// If we have implementations in scope, check "private" methods.
Method = LookupPrivateInstanceMethod(Sel, ClassDecl);
if (!Method && (!Receiver || !isSelfExpr(Receiver))) {
// If we still haven't found a method, look in the global pool. This
// behavior isn't very desirable, however we need it for GCC
// compatibility. FIXME: should we deviate??
if (OCIType->qual_empty()) {
Method = LookupInstanceMethodInGlobalPool(Sel,
SourceRange(LBracLoc, RBracLoc));
forwardClass = OCIType->getInterfaceDecl()->isForwardDecl();
if (Method && !forwardClass)
Diag(Loc, diag::warn_maynot_respond)
<< OCIType->getInterfaceDecl()->getIdentifier() << Sel;
}
}
}
if (Method && DiagnoseUseOfDecl(Method, Loc, forwardClass))
return ExprError();
} else if (!Context.getObjCIdType().isNull() &&
(ReceiverType->isPointerType() ||
ReceiverType->isIntegerType())) {
// Implicitly convert integers and pointers to 'id' but emit a warning.
Diag(Loc, diag::warn_bad_receiver_type)
<< ReceiverType
<< Receiver->getSourceRange();
if (ReceiverType->isPointerType())
ImpCastExprToType(Receiver, Context.getObjCIdType(),
CK_BitCast);
else {
// TODO: specialized warning on null receivers?
bool IsNull = Receiver->isNullPointerConstant(Context,
Expr::NPC_ValueDependentIsNull);
ImpCastExprToType(Receiver, Context.getObjCIdType(),
IsNull ? CK_NullToPointer : CK_IntegralToPointer);
}
ReceiverType = Receiver->getType();
}
else if (getLangOptions().CPlusPlus &&
!PerformContextuallyConvertToObjCId(Receiver)) {
if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(Receiver)) {
Receiver = ICE->getSubExpr();
ReceiverType = Receiver->getType();
}
return BuildInstanceMessage(Receiver,
ReceiverType,
SuperLoc,
Sel,
Method,
LBracLoc,
SelectorLoc,
RBracLoc,
move(ArgsIn));
} else {
// Reject other random receiver types (e.g. structs).
Diag(Loc, diag::err_bad_receiver_type)
<< ReceiverType << Receiver->getSourceRange();
return ExprError();
}
}
}
// Check the message arguments.
unsigned NumArgs = ArgsIn.size();
Expr **Args = reinterpret_cast<Expr **>(ArgsIn.release());
QualType ReturnType;
ExprValueKind VK = VK_RValue;
bool ClassMessage = (ReceiverType->isObjCClassType() ||
ReceiverType->isObjCQualifiedClassType());
if (CheckMessageArgumentTypes(Args, NumArgs, Sel, Method, ClassMessage,
LBracLoc, RBracLoc, ReturnType, VK))
return ExprError();
if (Method && !Method->getResultType()->isVoidType() &&
RequireCompleteType(LBracLoc, Method->getResultType(),
diag::err_illegal_message_expr_incomplete_type))
return ExprError();
// Construct the appropriate ObjCMessageExpr instance.
Expr *Result;
if (SuperLoc.isValid())
Result = ObjCMessageExpr::Create(Context, ReturnType, VK, LBracLoc,
SuperLoc, /*IsInstanceSuper=*/true,
ReceiverType, Sel, SelectorLoc, Method,
Args, NumArgs, RBracLoc);
else
Result = ObjCMessageExpr::Create(Context, ReturnType, VK, LBracLoc,
Receiver, Sel, SelectorLoc, Method,
Args, NumArgs, RBracLoc);
return MaybeBindToTemporary(Result);
}
// ActOnInstanceMessage - used for both unary and keyword messages.
// ArgExprs is optional - if it is present, the number of expressions
// is obtained from Sel.getNumArgs().
ExprResult Sema::ActOnInstanceMessage(Scope *S,
Expr *Receiver,
Selector Sel,
SourceLocation LBracLoc,
SourceLocation SelectorLoc,
SourceLocation RBracLoc,
MultiExprArg Args) {
if (!Receiver)
return ExprError();
return BuildInstanceMessage(Receiver, Receiver->getType(),
/*SuperLoc=*/SourceLocation(), Sel, /*Method=*/0,
LBracLoc, SelectorLoc, RBracLoc, move(Args));
}
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