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SemaExprObjC.cpp
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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/Analysis/DomainSpecific/CocoaConventions.h"
#include "clang/Edit/Rewriters.h"
#include "clang/Edit/Commit.h"
#include "clang/AST/ASTContext.h"
#include "clang/AST/DeclObjC.h"
#include "clang/AST/ExprObjC.h"
#include "clang/AST/StmtVisitor.h"
#include "clang/AST/TypeLoc.h"
#include "llvm/ADT/SmallString.h"
#include "clang/Lex/Preprocessor.h"
using namespace clang;
using namespace sema;
using llvm::makeArrayRef;
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.
SmallString<128> StrBuf;
SmallVector<SourceLocation, 8> StrLocs;
for (unsigned i = 0; i != NumStrings; ++i) {
S = Strings[i];
// ObjC strings can't be wide or UTF.
if (!S->isAscii()) {
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,
StringLiteral::Ascii, /*Pascal=*/false,
Context.getPointerType(Context.CharTy),
&StrLocs[0], StrLocs.size());
}
return BuildObjCStringLiteral(AtLocs[0], S);
}
ExprResult Sema::BuildObjCStringLiteral(SourceLocation AtLoc, StringLiteral *S){
// 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 (getLangOpts().NoConstantCFStrings) {
IdentifierInfo *NSIdent=0;
std::string StringClass(getLangOpts().ObjCConstantStringClass);
if (StringClass.empty())
NSIdent = &Context.Idents.get("NSConstantString");
else
NSIdent = &Context.Idents.get(StringClass);
NamedDecl *IF = LookupSingleName(TUScope, NSIdent, AtLoc,
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 = NSAPIObj->getNSClassId(NSAPI::ClassId_NSString);
NamedDecl *IF = LookupSingleName(TUScope, NSIdent, AtLoc,
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, implicitly declare
// a @class NSString; and use that instead. This is to make sure
// type of an NSString literal is represented correctly, instead of
// being an 'id' type.
Ty = Context.getObjCNSStringType();
if (Ty.isNull()) {
ObjCInterfaceDecl *NSStringIDecl =
ObjCInterfaceDecl::Create (Context,
Context.getTranslationUnitDecl(),
SourceLocation(), NSIdent,
0, SourceLocation());
Ty = Context.getObjCInterfaceType(NSStringIDecl);
Context.setObjCNSStringType(Ty);
}
Ty = Context.getObjCObjectPointerType(Ty);
}
}
return new (Context) ObjCStringLiteral(S, Ty, AtLoc);
}
/// \brief Retrieve the NSNumber factory method that should be used to create
/// an Objective-C literal for the given type.
static ObjCMethodDecl *getNSNumberFactoryMethod(Sema &S, SourceLocation Loc,
QualType NumberType,
bool isLiteral = false,
SourceRange R = SourceRange()) {
llvm::Optional<NSAPI::NSNumberLiteralMethodKind> Kind
= S.NSAPIObj->getNSNumberFactoryMethodKind(NumberType);
if (!Kind) {
if (isLiteral) {
S.Diag(Loc, diag::err_invalid_nsnumber_type)
<< NumberType << R;
}
return 0;
}
// If we already looked up this method, we're done.
if (S.NSNumberLiteralMethods[*Kind])
return S.NSNumberLiteralMethods[*Kind];
Selector Sel = S.NSAPIObj->getNSNumberLiteralSelector(*Kind,
/*Instance=*/false);
ASTContext &CX = S.Context;
// Look up the NSNumber class, if we haven't done so already. It's cached
// in the Sema instance.
if (!S.NSNumberDecl) {
IdentifierInfo *NSNumberId = S.NSAPIObj->getNSClassId(NSAPI::ClassId_NSNumber);
NamedDecl *IF = S.LookupSingleName(S.TUScope, NSNumberId,
Loc, Sema::LookupOrdinaryName);
S.NSNumberDecl = dyn_cast_or_null<ObjCInterfaceDecl>(IF);
if (!S.NSNumberDecl) {
if (S.getLangOpts().DebuggerObjCLiteral) {
// Create a stub definition of NSNumber.
S.NSNumberDecl = ObjCInterfaceDecl::Create (CX,
CX.getTranslationUnitDecl(),
SourceLocation(), NSNumberId,
0, SourceLocation());
} else {
// Otherwise, require a declaration of NSNumber.
S.Diag(Loc, diag::err_undeclared_nsnumber);
return 0;
}
} else if (!S.NSNumberDecl->hasDefinition()) {
S.Diag(Loc, diag::err_undeclared_nsnumber);
return 0;
}
// generate the pointer to NSNumber type.
S.NSNumberPointer = CX.getObjCObjectPointerType(CX.getObjCInterfaceType(S.NSNumberDecl));
}
// Look for the appropriate method within NSNumber.
ObjCMethodDecl *Method = S.NSNumberDecl->lookupClassMethod(Sel);;
if (!Method && S.getLangOpts().DebuggerObjCLiteral) {
// create a stub definition this NSNumber factory method.
TypeSourceInfo *ResultTInfo = 0;
Method = ObjCMethodDecl::Create(CX, SourceLocation(), SourceLocation(), Sel,
S.NSNumberPointer, ResultTInfo, S.NSNumberDecl,
/*isInstance=*/false, /*isVariadic=*/false,
/*isSynthesized=*/false,
/*isImplicitlyDeclared=*/true,
/*isDefined=*/false, ObjCMethodDecl::Required,
/*HasRelatedResultType=*/false);
ParmVarDecl *value = ParmVarDecl::Create(S.Context, Method,
SourceLocation(), SourceLocation(),
&CX.Idents.get("value"),
NumberType, /*TInfo=*/0, SC_None, SC_None, 0);
Method->setMethodParams(S.Context, value, ArrayRef<SourceLocation>());
}
if (!Method) {
S.Diag(Loc, diag::err_undeclared_nsnumber_method) << Sel;
return 0;
}
// Make sure the return type is reasonable.
if (!Method->getResultType()->isObjCObjectPointerType()) {
S.Diag(Loc, diag::err_objc_literal_method_sig)
<< Sel;
S.Diag(Method->getLocation(), diag::note_objc_literal_method_return)
<< Method->getResultType();
return 0;
}
// Note: if the parameter type is out-of-line, we'll catch it later in the
// implicit conversion.
S.NSNumberLiteralMethods[*Kind] = Method;
return Method;
}
/// BuildObjCNumericLiteral - builds an ObjCBoxedExpr AST node for the
/// numeric literal expression. Type of the expression will be "NSNumber *".
ExprResult Sema::BuildObjCNumericLiteral(SourceLocation AtLoc, Expr *Number) {
// compute the effective range of the literal, including the leading '@'.
SourceRange SR(AtLoc, Number->getSourceRange().getEnd());
// Determine the type of the literal.
QualType NumberType = Number->getType();
if (CharacterLiteral *Char = dyn_cast<CharacterLiteral>(Number)) {
// In C, character literals have type 'int'. That's not the type we want
// to use to determine the Objective-c literal kind.
switch (Char->getKind()) {
case CharacterLiteral::Ascii:
NumberType = Context.CharTy;
break;
case CharacterLiteral::Wide:
NumberType = Context.getWCharType();
break;
case CharacterLiteral::UTF16:
NumberType = Context.Char16Ty;
break;
case CharacterLiteral::UTF32:
NumberType = Context.Char32Ty;
break;
}
}
// Look for the appropriate method within NSNumber.
// Construct the literal.
ObjCMethodDecl *Method = getNSNumberFactoryMethod(*this, AtLoc, NumberType,
true, Number->getSourceRange());
if (!Method)
return ExprError();
// Convert the number to the type that the parameter expects.
QualType ArgType = Method->param_begin()[0]->getType();
ExprResult ConvertedNumber = PerformImplicitConversion(Number, ArgType,
AA_Sending);
if (ConvertedNumber.isInvalid())
return ExprError();
Number = ConvertedNumber.get();
return MaybeBindToTemporary(
new (Context) ObjCBoxedExpr(Number, NSNumberPointer, Method, SR));
}
ExprResult Sema::ActOnObjCBoolLiteral(SourceLocation AtLoc,
SourceLocation ValueLoc,
bool Value) {
ExprResult Inner;
if (getLangOpts().CPlusPlus) {
Inner = ActOnCXXBoolLiteral(ValueLoc, Value? tok::kw_true : tok::kw_false);
} else {
// C doesn't actually have a way to represent literal values of type
// _Bool. So, we'll use 0/1 and implicit cast to _Bool.
Inner = ActOnIntegerConstant(ValueLoc, Value? 1 : 0);
Inner = ImpCastExprToType(Inner.get(), Context.BoolTy,
CK_IntegralToBoolean);
}
return BuildObjCNumericLiteral(AtLoc, Inner.get());
}
/// \brief Check that the given expression is a valid element of an Objective-C
/// collection literal.
static ExprResult CheckObjCCollectionLiteralElement(Sema &S, Expr *Element,
QualType T) {
// If the expression is type-dependent, there's nothing for us to do.
if (Element->isTypeDependent())
return Element;
ExprResult Result = S.CheckPlaceholderExpr(Element);
if (Result.isInvalid())
return ExprError();
Element = Result.get();
// In C++, check for an implicit conversion to an Objective-C object pointer
// type.
if (S.getLangOpts().CPlusPlus && Element->getType()->isRecordType()) {
InitializedEntity Entity
= InitializedEntity::InitializeParameter(S.Context, T, /*Consumed=*/false);
InitializationKind Kind
= InitializationKind::CreateCopy(Element->getLocStart(), SourceLocation());
InitializationSequence Seq(S, Entity, Kind, &Element, 1);
if (!Seq.Failed())
return Seq.Perform(S, Entity, Kind, MultiExprArg(S, &Element, 1));
}
Expr *OrigElement = Element;
// Perform lvalue-to-rvalue conversion.
Result = S.DefaultLvalueConversion(Element);
if (Result.isInvalid())
return ExprError();
Element = Result.get();
// Make sure that we have an Objective-C pointer type or block.
if (!Element->getType()->isObjCObjectPointerType() &&
!Element->getType()->isBlockPointerType()) {
bool Recovered = false;
// If this is potentially an Objective-C numeric literal, add the '@'.
if (isa<IntegerLiteral>(OrigElement) ||
isa<CharacterLiteral>(OrigElement) ||
isa<FloatingLiteral>(OrigElement) ||
isa<ObjCBoolLiteralExpr>(OrigElement) ||
isa<CXXBoolLiteralExpr>(OrigElement)) {
if (S.NSAPIObj->getNSNumberFactoryMethodKind(OrigElement->getType())) {
int Which = isa<CharacterLiteral>(OrigElement) ? 1
: (isa<CXXBoolLiteralExpr>(OrigElement) ||
isa<ObjCBoolLiteralExpr>(OrigElement)) ? 2
: 3;
S.Diag(OrigElement->getLocStart(), diag::err_box_literal_collection)
<< Which << OrigElement->getSourceRange()
<< FixItHint::CreateInsertion(OrigElement->getLocStart(), "@");
Result = S.BuildObjCNumericLiteral(OrigElement->getLocStart(),
OrigElement);
if (Result.isInvalid())
return ExprError();
Element = Result.get();
Recovered = true;
}
}
// If this is potentially an Objective-C string literal, add the '@'.
else if (StringLiteral *String = dyn_cast<StringLiteral>(OrigElement)) {
if (String->isAscii()) {
S.Diag(OrigElement->getLocStart(), diag::err_box_literal_collection)
<< 0 << OrigElement->getSourceRange()
<< FixItHint::CreateInsertion(OrigElement->getLocStart(), "@");
Result = S.BuildObjCStringLiteral(OrigElement->getLocStart(), String);
if (Result.isInvalid())
return ExprError();
Element = Result.get();
Recovered = true;
}
}
if (!Recovered) {
S.Diag(Element->getLocStart(), diag::err_invalid_collection_element)
<< Element->getType();
return ExprError();
}
}
// Make sure that the element has the type that the container factory
// function expects.
return S.PerformCopyInitialization(
InitializedEntity::InitializeParameter(S.Context, T,
/*Consumed=*/false),
Element->getLocStart(), Element);
}
ExprResult Sema::BuildObjCBoxedExpr(SourceRange SR, Expr *ValueExpr) {
if (ValueExpr->isTypeDependent()) {
ObjCBoxedExpr *BoxedExpr =
new (Context) ObjCBoxedExpr(ValueExpr, Context.DependentTy, NULL, SR);
return Owned(BoxedExpr);
}
ObjCMethodDecl *BoxingMethod = NULL;
QualType BoxedType;
// Convert the expression to an RValue, so we can check for pointer types...
ExprResult RValue = DefaultFunctionArrayLvalueConversion(ValueExpr);
if (RValue.isInvalid()) {
return ExprError();
}
ValueExpr = RValue.get();
QualType ValueType(ValueExpr->getType().getCanonicalType());
if (const PointerType *PT = ValueType->getAs<PointerType>()) {
QualType PointeeType = PT->getPointeeType();
if (Context.hasSameUnqualifiedType(PointeeType, Context.CharTy)) {
if (!NSStringDecl) {
IdentifierInfo *NSStringId =
NSAPIObj->getNSClassId(NSAPI::ClassId_NSString);
NamedDecl *Decl = LookupSingleName(TUScope, NSStringId,
SR.getBegin(), LookupOrdinaryName);
NSStringDecl = dyn_cast_or_null<ObjCInterfaceDecl>(Decl);
if (!NSStringDecl) {
if (getLangOpts().DebuggerObjCLiteral) {
// Support boxed expressions in the debugger w/o NSString declaration.
NSStringDecl = ObjCInterfaceDecl::Create(Context,
Context.getTranslationUnitDecl(),
SourceLocation(), NSStringId,
0, SourceLocation());
} else {
Diag(SR.getBegin(), diag::err_undeclared_nsstring);
return ExprError();
}
} else if (!NSStringDecl->hasDefinition()) {
Diag(SR.getBegin(), diag::err_undeclared_nsstring);
return ExprError();
}
assert(NSStringDecl && "NSStringDecl should not be NULL");
NSStringPointer =
Context.getObjCObjectPointerType(Context.getObjCInterfaceType(NSStringDecl));
}
if (!StringWithUTF8StringMethod) {
IdentifierInfo *II = &Context.Idents.get("stringWithUTF8String");
Selector stringWithUTF8String = Context.Selectors.getUnarySelector(II);
// Look for the appropriate method within NSString.
StringWithUTF8StringMethod = NSStringDecl->lookupClassMethod(stringWithUTF8String);
if (!StringWithUTF8StringMethod && getLangOpts().DebuggerObjCLiteral) {
// Debugger needs to work even if NSString hasn't been defined.
TypeSourceInfo *ResultTInfo = 0;
ObjCMethodDecl *M =
ObjCMethodDecl::Create(Context, SourceLocation(), SourceLocation(),
stringWithUTF8String, NSStringPointer,
ResultTInfo, NSStringDecl,
/*isInstance=*/false, /*isVariadic=*/false,
/*isSynthesized=*/false,
/*isImplicitlyDeclared=*/true,
/*isDefined=*/false,
ObjCMethodDecl::Required,
/*HasRelatedResultType=*/false);
ParmVarDecl *value =
ParmVarDecl::Create(Context, M,
SourceLocation(), SourceLocation(),
&Context.Idents.get("value"),
Context.getPointerType(Context.CharTy.withConst()),
/*TInfo=*/0,
SC_None, SC_None, 0);
M->setMethodParams(Context, value, ArrayRef<SourceLocation>());
StringWithUTF8StringMethod = M;
}
assert(StringWithUTF8StringMethod &&
"StringWithUTF8StringMethod should not be NULL");
}
BoxingMethod = StringWithUTF8StringMethod;
BoxedType = NSStringPointer;
}
} else if (isa<BuiltinType>(ValueType)) {
// The other types we support are numeric, char and BOOL/bool. We could also
// provide limited support for structure types, such as NSRange, NSRect, and
// NSSize. See NSValue (NSValueGeometryExtensions) in <Foundation/NSGeometry.h>
// for more details.
// Check for a top-level character literal.
if (const CharacterLiteral *Char =
dyn_cast<CharacterLiteral>(ValueExpr->IgnoreParens())) {
// In C, character literals have type 'int'. That's not the type we want
// to use to determine the Objective-c literal kind.
switch (Char->getKind()) {
case CharacterLiteral::Ascii:
ValueType = Context.CharTy;
break;
case CharacterLiteral::Wide:
ValueType = Context.getWCharType();
break;
case CharacterLiteral::UTF16:
ValueType = Context.Char16Ty;
break;
case CharacterLiteral::UTF32:
ValueType = Context.Char32Ty;
break;
}
}
// FIXME: Do I need to do anything special with BoolTy expressions?
// Look for the appropriate method within NSNumber.
BoxingMethod = getNSNumberFactoryMethod(*this, SR.getBegin(), ValueType);
BoxedType = NSNumberPointer;
}
if (!BoxingMethod) {
Diag(SR.getBegin(), diag::err_objc_illegal_boxed_expression_type)
<< ValueType << ValueExpr->getSourceRange();
return ExprError();
}
// Convert the expression to the type that the parameter requires.
QualType ArgType = BoxingMethod->param_begin()[0]->getType();
ExprResult ConvertedValueExpr = PerformImplicitConversion(ValueExpr, ArgType,
AA_Sending);
if (ConvertedValueExpr.isInvalid())
return ExprError();
ValueExpr = ConvertedValueExpr.get();
ObjCBoxedExpr *BoxedExpr =
new (Context) ObjCBoxedExpr(ValueExpr, BoxedType,
BoxingMethod, SR);
return MaybeBindToTemporary(BoxedExpr);
}
ExprResult Sema::BuildObjCSubscriptExpression(SourceLocation RB, Expr *BaseExpr,
Expr *IndexExpr,
ObjCMethodDecl *getterMethod,
ObjCMethodDecl *setterMethod) {
// Feature support is for modern abi.
if (!LangOpts.ObjCNonFragileABI)
return ExprError();
// If the expression is type-dependent, there's nothing for us to do.
assert ((!BaseExpr->isTypeDependent() && !IndexExpr->isTypeDependent()) &&
"base or index cannot have dependent type here");
ExprResult Result = CheckPlaceholderExpr(IndexExpr);
if (Result.isInvalid())
return ExprError();
IndexExpr = Result.get();
// Perform lvalue-to-rvalue conversion.
Result = DefaultLvalueConversion(BaseExpr);
if (Result.isInvalid())
return ExprError();
BaseExpr = Result.get();
return Owned(ObjCSubscriptRefExpr::Create(Context,
BaseExpr,
IndexExpr,
Context.PseudoObjectTy,
getterMethod,
setterMethod, RB));
}
ExprResult Sema::BuildObjCArrayLiteral(SourceRange SR, MultiExprArg Elements) {
// Look up the NSArray class, if we haven't done so already.
if (!NSArrayDecl) {
NamedDecl *IF = LookupSingleName(TUScope,
NSAPIObj->getNSClassId(NSAPI::ClassId_NSArray),
SR.getBegin(),
LookupOrdinaryName);
NSArrayDecl = dyn_cast_or_null<ObjCInterfaceDecl>(IF);
if (!NSArrayDecl && getLangOpts().DebuggerObjCLiteral)
NSArrayDecl = ObjCInterfaceDecl::Create (Context,
Context.getTranslationUnitDecl(),
SourceLocation(),
NSAPIObj->getNSClassId(NSAPI::ClassId_NSArray),
0, SourceLocation());
if (!NSArrayDecl) {
Diag(SR.getBegin(), diag::err_undeclared_nsarray);
return ExprError();
}
}
// Find the arrayWithObjects:count: method, if we haven't done so already.
QualType IdT = Context.getObjCIdType();
if (!ArrayWithObjectsMethod) {
Selector
Sel = NSAPIObj->getNSArraySelector(NSAPI::NSArr_arrayWithObjectsCount);
ArrayWithObjectsMethod = NSArrayDecl->lookupClassMethod(Sel);
if (!ArrayWithObjectsMethod && getLangOpts().DebuggerObjCLiteral) {
TypeSourceInfo *ResultTInfo = 0;
ArrayWithObjectsMethod =
ObjCMethodDecl::Create(Context,
SourceLocation(), SourceLocation(), Sel,
IdT,
ResultTInfo,
Context.getTranslationUnitDecl(),
false /*Instance*/, false/*isVariadic*/,
/*isSynthesized=*/false,
/*isImplicitlyDeclared=*/true, /*isDefined=*/false,
ObjCMethodDecl::Required,
false);
SmallVector<ParmVarDecl *, 2> Params;
ParmVarDecl *objects = ParmVarDecl::Create(Context, ArrayWithObjectsMethod,
SourceLocation(), SourceLocation(),
&Context.Idents.get("objects"),
Context.getPointerType(IdT),
/*TInfo=*/0,
SC_None,
SC_None,
0);
Params.push_back(objects);
ParmVarDecl *cnt = ParmVarDecl::Create(Context, ArrayWithObjectsMethod,
SourceLocation(), SourceLocation(),
&Context.Idents.get("cnt"),
Context.UnsignedLongTy,
/*TInfo=*/0,
SC_None,
SC_None,
0);
Params.push_back(cnt);
ArrayWithObjectsMethod->setMethodParams(Context, Params,
ArrayRef<SourceLocation>());
}
if (!ArrayWithObjectsMethod) {
Diag(SR.getBegin(), diag::err_undeclared_arraywithobjects) << Sel;
return ExprError();
}
}
// Make sure the return type is reasonable.
if (!ArrayWithObjectsMethod->getResultType()->isObjCObjectPointerType()) {
Diag(SR.getBegin(), diag::err_objc_literal_method_sig)
<< ArrayWithObjectsMethod->getSelector();
Diag(ArrayWithObjectsMethod->getLocation(),
diag::note_objc_literal_method_return)
<< ArrayWithObjectsMethod->getResultType();
return ExprError();
}
// Dig out the type that all elements should be converted to.
QualType T = ArrayWithObjectsMethod->param_begin()[0]->getType();
const PointerType *PtrT = T->getAs<PointerType>();
if (!PtrT ||
!Context.hasSameUnqualifiedType(PtrT->getPointeeType(), IdT)) {
Diag(SR.getBegin(), diag::err_objc_literal_method_sig)
<< ArrayWithObjectsMethod->getSelector();
Diag(ArrayWithObjectsMethod->param_begin()[0]->getLocation(),
diag::note_objc_literal_method_param)
<< 0 << T
<< Context.getPointerType(IdT.withConst());
return ExprError();
}
T = PtrT->getPointeeType();
// Check that the 'count' parameter is integral.
if (!ArrayWithObjectsMethod->param_begin()[1]->getType()->isIntegerType()) {
Diag(SR.getBegin(), diag::err_objc_literal_method_sig)
<< ArrayWithObjectsMethod->getSelector();
Diag(ArrayWithObjectsMethod->param_begin()[1]->getLocation(),
diag::note_objc_literal_method_param)
<< 1
<< ArrayWithObjectsMethod->param_begin()[1]->getType()
<< "integral";
return ExprError();
}
// Check that each of the elements provided is valid in a collection literal,
// performing conversions as necessary.
Expr **ElementsBuffer = Elements.get();
for (unsigned I = 0, N = Elements.size(); I != N; ++I) {
ExprResult Converted = CheckObjCCollectionLiteralElement(*this,
ElementsBuffer[I],
T);
if (Converted.isInvalid())
return ExprError();
ElementsBuffer[I] = Converted.get();
}
QualType Ty
= Context.getObjCObjectPointerType(
Context.getObjCInterfaceType(NSArrayDecl));
return MaybeBindToTemporary(
ObjCArrayLiteral::Create(Context,
llvm::makeArrayRef(Elements.get(),
Elements.size()),
Ty, ArrayWithObjectsMethod, SR));
}
ExprResult Sema::BuildObjCDictionaryLiteral(SourceRange SR,
ObjCDictionaryElement *Elements,
unsigned NumElements) {
// Look up the NSDictionary class, if we haven't done so already.
if (!NSDictionaryDecl) {
NamedDecl *IF = LookupSingleName(TUScope,
NSAPIObj->getNSClassId(NSAPI::ClassId_NSDictionary),
SR.getBegin(), LookupOrdinaryName);
NSDictionaryDecl = dyn_cast_or_null<ObjCInterfaceDecl>(IF);
if (!NSDictionaryDecl && getLangOpts().DebuggerObjCLiteral)
NSDictionaryDecl = ObjCInterfaceDecl::Create (Context,
Context.getTranslationUnitDecl(),
SourceLocation(),
NSAPIObj->getNSClassId(NSAPI::ClassId_NSDictionary),
0, SourceLocation());
if (!NSDictionaryDecl) {
Diag(SR.getBegin(), diag::err_undeclared_nsdictionary);
return ExprError();
}
}
// Find the dictionaryWithObjects:forKeys:count: method, if we haven't done
// so already.
QualType IdT = Context.getObjCIdType();
if (!DictionaryWithObjectsMethod) {
Selector Sel = NSAPIObj->getNSDictionarySelector(
NSAPI::NSDict_dictionaryWithObjectsForKeysCount);
DictionaryWithObjectsMethod = NSDictionaryDecl->lookupClassMethod(Sel);
if (!DictionaryWithObjectsMethod && getLangOpts().DebuggerObjCLiteral) {
DictionaryWithObjectsMethod =
ObjCMethodDecl::Create(Context,
SourceLocation(), SourceLocation(), Sel,
IdT,
0 /*TypeSourceInfo */,
Context.getTranslationUnitDecl(),
false /*Instance*/, false/*isVariadic*/,
/*isSynthesized=*/false,
/*isImplicitlyDeclared=*/true, /*isDefined=*/false,
ObjCMethodDecl::Required,
false);
SmallVector<ParmVarDecl *, 3> Params;
ParmVarDecl *objects = ParmVarDecl::Create(Context, DictionaryWithObjectsMethod,
SourceLocation(), SourceLocation(),
&Context.Idents.get("objects"),
Context.getPointerType(IdT),
/*TInfo=*/0,
SC_None,
SC_None,
0);
Params.push_back(objects);
ParmVarDecl *keys = ParmVarDecl::Create(Context, DictionaryWithObjectsMethod,
SourceLocation(), SourceLocation(),
&Context.Idents.get("keys"),
Context.getPointerType(IdT),
/*TInfo=*/0,
SC_None,
SC_None,
0);
Params.push_back(keys);
ParmVarDecl *cnt = ParmVarDecl::Create(Context, DictionaryWithObjectsMethod,
SourceLocation(), SourceLocation(),
&Context.Idents.get("cnt"),
Context.UnsignedLongTy,
/*TInfo=*/0,
SC_None,
SC_None,
0);
Params.push_back(cnt);
DictionaryWithObjectsMethod->setMethodParams(Context, Params,
ArrayRef<SourceLocation>());
}
if (!DictionaryWithObjectsMethod) {
Diag(SR.getBegin(), diag::err_undeclared_dictwithobjects) << Sel;
return ExprError();
}
}
// Make sure the return type is reasonable.
if (!DictionaryWithObjectsMethod->getResultType()->isObjCObjectPointerType()){
Diag(SR.getBegin(), diag::err_objc_literal_method_sig)
<< DictionaryWithObjectsMethod->getSelector();
Diag(DictionaryWithObjectsMethod->getLocation(),
diag::note_objc_literal_method_return)
<< DictionaryWithObjectsMethod->getResultType();
return ExprError();
}
// Dig out the type that all values should be converted to.
QualType ValueT = DictionaryWithObjectsMethod->param_begin()[0]->getType();
const PointerType *PtrValue = ValueT->getAs<PointerType>();
if (!PtrValue ||
!Context.hasSameUnqualifiedType(PtrValue->getPointeeType(), IdT)) {
Diag(SR.getBegin(), diag::err_objc_literal_method_sig)
<< DictionaryWithObjectsMethod->getSelector();
Diag(DictionaryWithObjectsMethod->param_begin()[0]->getLocation(),
diag::note_objc_literal_method_param)
<< 0 << ValueT
<< Context.getPointerType(IdT.withConst());
return ExprError();
}
ValueT = PtrValue->getPointeeType();
// Dig out the type that all keys should be converted to.
QualType KeyT = DictionaryWithObjectsMethod->param_begin()[1]->getType();
const PointerType *PtrKey = KeyT->getAs<PointerType>();
if (!PtrKey ||
!Context.hasSameUnqualifiedType(PtrKey->getPointeeType(),
IdT)) {
bool err = true;
if (PtrKey) {
if (QIDNSCopying.isNull()) {
// key argument of selector is id<NSCopying>?
if (ObjCProtocolDecl *NSCopyingPDecl =
LookupProtocol(&Context.Idents.get("NSCopying"), SR.getBegin())) {
ObjCProtocolDecl *PQ[] = {NSCopyingPDecl};
QIDNSCopying =
Context.getObjCObjectType(Context.ObjCBuiltinIdTy,
(ObjCProtocolDecl**) PQ,1);
QIDNSCopying = Context.getObjCObjectPointerType(QIDNSCopying);
}
}
if (!QIDNSCopying.isNull())
err = !Context.hasSameUnqualifiedType(PtrKey->getPointeeType(),
QIDNSCopying);
}
if (err) {
Diag(SR.getBegin(), diag::err_objc_literal_method_sig)
<< DictionaryWithObjectsMethod->getSelector();
Diag(DictionaryWithObjectsMethod->param_begin()[1]->getLocation(),
diag::note_objc_literal_method_param)
<< 1 << KeyT
<< Context.getPointerType(IdT.withConst());
return ExprError();
}
}
KeyT = PtrKey->getPointeeType();
// Check that the 'count' parameter is integral.
if (!DictionaryWithObjectsMethod->param_begin()[2]->getType()
->isIntegerType()) {
Diag(SR.getBegin(), diag::err_objc_literal_method_sig)
<< DictionaryWithObjectsMethod->getSelector();
Diag(DictionaryWithObjectsMethod->param_begin()[2]->getLocation(),
diag::note_objc_literal_method_param)
<< 2
<< DictionaryWithObjectsMethod->param_begin()[2]->getType()
<< "integral";
return ExprError();
}
// Check that each of the keys and values provided is valid in a collection
// literal, performing conversions as necessary.
bool HasPackExpansions = false;
for (unsigned I = 0, N = NumElements; I != N; ++I) {
// Check the key.
ExprResult Key = CheckObjCCollectionLiteralElement(*this, Elements[I].Key,
KeyT);
if (Key.isInvalid())
return ExprError();
// Check the value.
ExprResult Value
= CheckObjCCollectionLiteralElement(*this, Elements[I].Value, ValueT);
if (Value.isInvalid())
return ExprError();
Elements[I].Key = Key.get();
Elements[I].Value = Value.get();
if (Elements[I].EllipsisLoc.isInvalid())
continue;
if (!Elements[I].Key->containsUnexpandedParameterPack() &&
!Elements[I].Value->containsUnexpandedParameterPack()) {
Diag(Elements[I].EllipsisLoc,
diag::err_pack_expansion_without_parameter_packs)
<< SourceRange(Elements[I].Key->getLocStart(),
Elements[I].Value->getLocEnd());
return ExprError();
}
HasPackExpansions = true;
}
QualType Ty
= Context.getObjCObjectPointerType(
Context.getObjCInterfaceType(NSDictionaryDecl));
return MaybeBindToTemporary(
ObjCDictionaryLiteral::Create(Context,
llvm::makeArrayRef(Elements,
NumElements),
HasPackExpansions,
Ty,
DictionaryWithObjectsMethod, SR));
}
ExprResult Sema::BuildObjCEncodeExpression(SourceLocation AtLoc,
TypeSourceInfo *EncodedTypeInfo,
SourceLocation RParenLoc) {
QualType EncodedType = EncodedTypeInfo->getType();
QualType StrTy;
if (EncodedType->isDependentType())
StrTy = Context.DependentTy;
else {
if (!EncodedType->getAsArrayTypeUnsafe() && //// Incomplete array is handled.
!EncodedType->isVoidType()) // void is handled too.
if (RequireCompleteType(AtLoc, EncodedType,
PDiag(diag::err_incomplete_type_objc_at_encode)
<< EncodedTypeInfo->getTypeLoc().getSourceRange()))
return ExprError();
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 (getLangOpts().CPlusPlus || getLangOpts().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;
if (!Method ||
Method->getImplementationControl() != ObjCMethodDecl::Optional) {
llvm::DenseMap<Selector, SourceLocation>::iterator Pos
= ReferencedSelectors.find(Sel);
if (Pos == ReferencedSelectors.end())
ReferencedSelectors.insert(std::make_pair(Sel, SelLoc));
}
// In ARC, forbid the user from using @selector for
// retain/release/autorelease/dealloc/retainCount.
if (getLangOpts().ObjCAutoRefCount) {
switch (Sel.getMethodFamily()) {
case OMF_retain:
case OMF_release:
case OMF_autorelease:
case OMF_retainCount:
case OMF_dealloc:
Diag(AtLoc, diag::err_arc_illegal_selector) <<
Sel << SourceRange(LParenLoc, RParenLoc);
break;
case OMF_None:
case OMF_alloc:
case OMF_copy:
case OMF_finalize:
case OMF_init:
case OMF_mutableCopy:
case OMF_new:
case OMF_self:
case OMF_performSelector:
break;
}
}
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;