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SemaExprObjC.cpp
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SemaExprObjC.cpp
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//===--- SemaExprObjC.cpp - Semantic Analysis for ObjC Expressions --------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file implements semantic analysis for Objective-C expressions.
//
//===----------------------------------------------------------------------===//
#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 "clang/Analysis/DomainSpecific/CocoaConventions.h"
#include "clang/Basic/Builtins.h"
#include "clang/Edit/Commit.h"
#include "clang/Edit/Rewriters.h"
#include "clang/Lex/Preprocessor.h"
#include "clang/Sema/Initialization.h"
#include "clang/Sema/Lookup.h"
#include "clang/Sema/Scope.h"
#include "clang/Sema/ScopeInfo.h"
#include "clang/Sema/SemaInternal.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/Support/ConvertUTF.h"
#include <optional>
using namespace clang;
using namespace sema;
using llvm::ArrayRef;
ExprResult Sema::ParseObjCStringLiteral(SourceLocation *AtLocs,
ArrayRef<Expr *> 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 = cast<StringLiteral>(Strings[0]);
// If we have a multi-part string, merge it all together.
if (Strings.size() != 1) {
// Concatenate objc strings.
SmallString<128> StrBuf;
SmallVector<SourceLocation, 8> StrLocs;
for (Expr *E : Strings) {
S = cast<StringLiteral>(E);
// ObjC strings can't be wide or UTF.
if (!S->isOrdinary()) {
Diag(S->getBeginLoc(), 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.
const ConstantArrayType *CAT = Context.getAsConstantArrayType(S->getType());
assert(CAT && "String literal not of constant array type!");
QualType StrTy = Context.getConstantArrayType(
CAT->getElementType(), llvm::APInt(32, StrBuf.size() + 1), nullptr,
CAT->getSizeModifier(), CAT->getIndexTypeCVRQualifiers());
S = StringLiteral::Create(Context, StrBuf, StringLiteral::Ordinary,
/*Pascal=*/false, StrTy, &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=nullptr;
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->getBeginLoc(), 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,
nullptr, nullptr, SourceLocation());
Ty = Context.getObjCInterfaceType(NSStringIDecl);
Context.setObjCNSStringType(Ty);
}
Ty = Context.getObjCObjectPointerType(Ty);
}
}
return new (Context) ObjCStringLiteral(S, Ty, AtLoc);
}
/// Emits an error if the given method does not exist, or if the return
/// type is not an Objective-C object.
static bool validateBoxingMethod(Sema &S, SourceLocation Loc,
const ObjCInterfaceDecl *Class,
Selector Sel, const ObjCMethodDecl *Method) {
if (!Method) {
// FIXME: Is there a better way to avoid quotes than using getName()?
S.Diag(Loc, diag::err_undeclared_boxing_method) << Sel << Class->getName();
return false;
}
// Make sure the return type is reasonable.
QualType ReturnType = Method->getReturnType();
if (!ReturnType->isObjCObjectPointerType()) {
S.Diag(Loc, diag::err_objc_literal_method_sig)
<< Sel;
S.Diag(Method->getLocation(), diag::note_objc_literal_method_return)
<< ReturnType;
return false;
}
return true;
}
/// Maps ObjCLiteralKind to NSClassIdKindKind
static NSAPI::NSClassIdKindKind ClassKindFromLiteralKind(
Sema::ObjCLiteralKind LiteralKind) {
switch (LiteralKind) {
case Sema::LK_Array:
return NSAPI::ClassId_NSArray;
case Sema::LK_Dictionary:
return NSAPI::ClassId_NSDictionary;
case Sema::LK_Numeric:
return NSAPI::ClassId_NSNumber;
case Sema::LK_String:
return NSAPI::ClassId_NSString;
case Sema::LK_Boxed:
return NSAPI::ClassId_NSValue;
// there is no corresponding matching
// between LK_None/LK_Block and NSClassIdKindKind
case Sema::LK_Block:
case Sema::LK_None:
break;
}
llvm_unreachable("LiteralKind can't be converted into a ClassKind");
}
/// Validates ObjCInterfaceDecl availability.
/// ObjCInterfaceDecl, used to create ObjC literals, should be defined
/// if clang not in a debugger mode.
static bool ValidateObjCLiteralInterfaceDecl(Sema &S, ObjCInterfaceDecl *Decl,
SourceLocation Loc,
Sema::ObjCLiteralKind LiteralKind) {
if (!Decl) {
NSAPI::NSClassIdKindKind Kind = ClassKindFromLiteralKind(LiteralKind);
IdentifierInfo *II = S.NSAPIObj->getNSClassId(Kind);
S.Diag(Loc, diag::err_undeclared_objc_literal_class)
<< II->getName() << LiteralKind;
return false;
} else if (!Decl->hasDefinition() && !S.getLangOpts().DebuggerObjCLiteral) {
S.Diag(Loc, diag::err_undeclared_objc_literal_class)
<< Decl->getName() << LiteralKind;
S.Diag(Decl->getLocation(), diag::note_forward_class);
return false;
}
return true;
}
/// Looks up ObjCInterfaceDecl of a given NSClassIdKindKind.
/// Used to create ObjC literals, such as NSDictionary (@{}),
/// NSArray (@[]) and Boxed Expressions (@())
static ObjCInterfaceDecl *LookupObjCInterfaceDeclForLiteral(Sema &S,
SourceLocation Loc,
Sema::ObjCLiteralKind LiteralKind) {
NSAPI::NSClassIdKindKind ClassKind = ClassKindFromLiteralKind(LiteralKind);
IdentifierInfo *II = S.NSAPIObj->getNSClassId(ClassKind);
NamedDecl *IF = S.LookupSingleName(S.TUScope, II, Loc,
Sema::LookupOrdinaryName);
ObjCInterfaceDecl *ID = dyn_cast_or_null<ObjCInterfaceDecl>(IF);
if (!ID && S.getLangOpts().DebuggerObjCLiteral) {
ASTContext &Context = S.Context;
TranslationUnitDecl *TU = Context.getTranslationUnitDecl();
ID = ObjCInterfaceDecl::Create (Context, TU, SourceLocation(), II,
nullptr, nullptr, SourceLocation());
}
if (!ValidateObjCLiteralInterfaceDecl(S, ID, Loc, LiteralKind)) {
ID = nullptr;
}
return ID;
}
/// 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()) {
std::optional<NSAPI::NSNumberLiteralMethodKind> Kind =
S.NSAPIObj->getNSNumberFactoryMethodKind(NumberType);
if (!Kind) {
if (isLiteral) {
S.Diag(Loc, diag::err_invalid_nsnumber_type)
<< NumberType << R;
}
return nullptr;
}
// 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) {
S.NSNumberDecl = LookupObjCInterfaceDeclForLiteral(S, Loc,
Sema::LK_Numeric);
if (!S.NSNumberDecl) {
return nullptr;
}
}
if (S.NSNumberPointer.isNull()) {
// generate the pointer to NSNumber type.
QualType NSNumberObject = CX.getObjCInterfaceType(S.NSNumberDecl);
S.NSNumberPointer = CX.getObjCObjectPointerType(NSNumberObject);
}
// 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 *ReturnTInfo = nullptr;
Method =
ObjCMethodDecl::Create(CX, SourceLocation(), SourceLocation(), Sel,
S.NSNumberPointer, ReturnTInfo, S.NSNumberDecl,
/*isInstance=*/false, /*isVariadic=*/false,
/*isPropertyAccessor=*/false,
/*isSynthesizedAccessorStub=*/false,
/*isImplicitlyDeclared=*/true,
/*isDefined=*/false, ObjCMethodDecl::Required,
/*HasRelatedResultType=*/false);
ParmVarDecl *value = ParmVarDecl::Create(S.Context, Method,
SourceLocation(), SourceLocation(),
&CX.Idents.get("value"),
NumberType, /*TInfo=*/nullptr,
SC_None, nullptr);
Method->setMethodParams(S.Context, value, std::nullopt);
}
if (!validateBoxingMethod(S, Loc, S.NSNumberDecl, Sel, Method))
return nullptr;
// 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) {
// 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:
case CharacterLiteral::UTF8:
NumberType = Context.CharTy;
break;
case CharacterLiteral::Wide:
NumberType = Context.getWideCharType();
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.
SourceRange NR(Number->getSourceRange());
ObjCMethodDecl *Method = getNSNumberFactoryMethod(*this, AtLoc, NumberType,
true, NR);
if (!Method)
return ExprError();
// Convert the number to the type that the parameter expects.
ParmVarDecl *ParamDecl = Method->parameters()[0];
InitializedEntity Entity = InitializedEntity::InitializeParameter(Context,
ParamDecl);
ExprResult ConvertedNumber = PerformCopyInitialization(Entity,
SourceLocation(),
Number);
if (ConvertedNumber.isInvalid())
return ExprError();
Number = ConvertedNumber.get();
// Use the effective source range of the literal, including the leading '@'.
return MaybeBindToTemporary(
new (Context) ObjCBoxedExpr(Number, NSNumberPointer, Method,
SourceRange(AtLoc, NR.getEnd())));
}
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());
}
/// Check that the given expression is a valid element of an Objective-C
/// collection literal.
static ExprResult CheckObjCCollectionLiteralElement(Sema &S, Expr *Element,
QualType T,
bool ArrayLiteral = false) {
// 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->getBeginLoc(), SourceLocation());
InitializationSequence Seq(S, Entity, Kind, Element);
if (!Seq.Failed())
return Seq.Perform(S, Entity, Kind, Element);
}
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->getBeginLoc(), diag::err_box_literal_collection)
<< Which << OrigElement->getSourceRange()
<< FixItHint::CreateInsertion(OrigElement->getBeginLoc(), "@");
Result =
S.BuildObjCNumericLiteral(OrigElement->getBeginLoc(), 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->isOrdinary()) {
S.Diag(OrigElement->getBeginLoc(), diag::err_box_literal_collection)
<< 0 << OrigElement->getSourceRange()
<< FixItHint::CreateInsertion(OrigElement->getBeginLoc(), "@");
Result = S.BuildObjCStringLiteral(OrigElement->getBeginLoc(), String);
if (Result.isInvalid())
return ExprError();
Element = Result.get();
Recovered = true;
}
}
if (!Recovered) {
S.Diag(Element->getBeginLoc(), diag::err_invalid_collection_element)
<< Element->getType();
return ExprError();
}
}
if (ArrayLiteral)
if (ObjCStringLiteral *getString =
dyn_cast<ObjCStringLiteral>(OrigElement)) {
if (StringLiteral *SL = getString->getString()) {
unsigned numConcat = SL->getNumConcatenated();
if (numConcat > 1) {
// Only warn if the concatenated string doesn't come from a macro.
bool hasMacro = false;
for (unsigned i = 0; i < numConcat ; ++i)
if (SL->getStrTokenLoc(i).isMacroID()) {
hasMacro = true;
break;
}
if (!hasMacro)
S.Diag(Element->getBeginLoc(),
diag::warn_concatenated_nsarray_literal)
<< Element->getType();
}
}
}
// 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->getBeginLoc(), Element);
}
ExprResult Sema::BuildObjCBoxedExpr(SourceRange SR, Expr *ValueExpr) {
if (ValueExpr->isTypeDependent()) {
ObjCBoxedExpr *BoxedExpr =
new (Context) ObjCBoxedExpr(ValueExpr, Context.DependentTy, nullptr, SR);
return BoxedExpr;
}
ObjCMethodDecl *BoxingMethod = nullptr;
QualType BoxedType;
// Convert the expression to an RValue, so we can check for pointer types...
ExprResult RValue = DefaultFunctionArrayLvalueConversion(ValueExpr);
if (RValue.isInvalid()) {
return ExprError();
}
SourceLocation Loc = SR.getBegin();
ValueExpr = RValue.get();
QualType ValueType(ValueExpr->getType());
if (const PointerType *PT = ValueType->getAs<PointerType>()) {
QualType PointeeType = PT->getPointeeType();
if (Context.hasSameUnqualifiedType(PointeeType, Context.CharTy)) {
if (!NSStringDecl) {
NSStringDecl = LookupObjCInterfaceDeclForLiteral(*this, Loc,
Sema::LK_String);
if (!NSStringDecl) {
return ExprError();
}
QualType NSStringObject = Context.getObjCInterfaceType(NSStringDecl);
NSStringPointer = Context.getObjCObjectPointerType(NSStringObject);
}
// The boxed expression can be emitted as a compile time constant if it is
// a string literal whose character encoding is compatible with UTF-8.
if (auto *CE = dyn_cast<ImplicitCastExpr>(ValueExpr))
if (CE->getCastKind() == CK_ArrayToPointerDecay)
if (auto *SL =
dyn_cast<StringLiteral>(CE->getSubExpr()->IgnoreParens())) {
assert((SL->isOrdinary() || SL->isUTF8()) &&
"unexpected character encoding");
StringRef Str = SL->getString();
const llvm::UTF8 *StrBegin = Str.bytes_begin();
const llvm::UTF8 *StrEnd = Str.bytes_end();
// Check that this is a valid UTF-8 string.
if (llvm::isLegalUTF8String(&StrBegin, StrEnd)) {
BoxedType = Context.getAttributedType(
AttributedType::getNullabilityAttrKind(
NullabilityKind::NonNull),
NSStringPointer, NSStringPointer);
return new (Context) ObjCBoxedExpr(CE, BoxedType, nullptr, SR);
}
Diag(SL->getBeginLoc(), diag::warn_objc_boxing_invalid_utf8_string)
<< NSStringPointer << SL->getSourceRange();
}
if (!StringWithUTF8StringMethod) {
IdentifierInfo *II = &Context.Idents.get("stringWithUTF8String");
Selector stringWithUTF8String = Context.Selectors.getUnarySelector(II);
// Look for the appropriate method within NSString.
BoxingMethod = NSStringDecl->lookupClassMethod(stringWithUTF8String);
if (!BoxingMethod && getLangOpts().DebuggerObjCLiteral) {
// Debugger needs to work even if NSString hasn't been defined.
TypeSourceInfo *ReturnTInfo = nullptr;
ObjCMethodDecl *M = ObjCMethodDecl::Create(
Context, SourceLocation(), SourceLocation(), stringWithUTF8String,
NSStringPointer, ReturnTInfo, NSStringDecl,
/*isInstance=*/false, /*isVariadic=*/false,
/*isPropertyAccessor=*/false,
/*isSynthesizedAccessorStub=*/false,
/*isImplicitlyDeclared=*/true,
/*isDefined=*/false, ObjCMethodDecl::Required,
/*HasRelatedResultType=*/false);
QualType ConstCharType = Context.CharTy.withConst();
ParmVarDecl *value =
ParmVarDecl::Create(Context, M,
SourceLocation(), SourceLocation(),
&Context.Idents.get("value"),
Context.getPointerType(ConstCharType),
/*TInfo=*/nullptr,
SC_None, nullptr);
M->setMethodParams(Context, value, std::nullopt);
BoxingMethod = M;
}
if (!validateBoxingMethod(*this, Loc, NSStringDecl,
stringWithUTF8String, BoxingMethod))
return ExprError();
StringWithUTF8StringMethod = BoxingMethod;
}
BoxingMethod = StringWithUTF8StringMethod;
BoxedType = NSStringPointer;
// Transfer the nullability from method's return type.
std::optional<NullabilityKind> Nullability =
BoxingMethod->getReturnType()->getNullability();
if (Nullability)
BoxedType = Context.getAttributedType(
AttributedType::getNullabilityAttrKind(*Nullability), BoxedType,
BoxedType);
}
} else if (ValueType->isBuiltinType()) {
// 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:
case CharacterLiteral::UTF8:
ValueType = Context.CharTy;
break;
case CharacterLiteral::Wide:
ValueType = Context.getWideCharType();
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, Loc, ValueType);
BoxedType = NSNumberPointer;
} else if (const EnumType *ET = ValueType->getAs<EnumType>()) {
if (!ET->getDecl()->isComplete()) {
Diag(Loc, diag::err_objc_incomplete_boxed_expression_type)
<< ValueType << ValueExpr->getSourceRange();
return ExprError();
}
BoxingMethod = getNSNumberFactoryMethod(*this, Loc,
ET->getDecl()->getIntegerType());
BoxedType = NSNumberPointer;
} else if (ValueType->isObjCBoxableRecordType()) {
// Support for structure types, that marked as objc_boxable
// struct __attribute__((objc_boxable)) s { ... };
// Look up the NSValue class, if we haven't done so already. It's cached
// in the Sema instance.
if (!NSValueDecl) {
NSValueDecl = LookupObjCInterfaceDeclForLiteral(*this, Loc,
Sema::LK_Boxed);
if (!NSValueDecl) {
return ExprError();
}
// generate the pointer to NSValue type.
QualType NSValueObject = Context.getObjCInterfaceType(NSValueDecl);
NSValuePointer = Context.getObjCObjectPointerType(NSValueObject);
}
if (!ValueWithBytesObjCTypeMethod) {
IdentifierInfo *II[] = {
&Context.Idents.get("valueWithBytes"),
&Context.Idents.get("objCType")
};
Selector ValueWithBytesObjCType = Context.Selectors.getSelector(2, II);
// Look for the appropriate method within NSValue.
BoxingMethod = NSValueDecl->lookupClassMethod(ValueWithBytesObjCType);
if (!BoxingMethod && getLangOpts().DebuggerObjCLiteral) {
// Debugger needs to work even if NSValue hasn't been defined.
TypeSourceInfo *ReturnTInfo = nullptr;
ObjCMethodDecl *M = ObjCMethodDecl::Create(
Context, SourceLocation(), SourceLocation(), ValueWithBytesObjCType,
NSValuePointer, ReturnTInfo, NSValueDecl,
/*isInstance=*/false,
/*isVariadic=*/false,
/*isPropertyAccessor=*/false,
/*isSynthesizedAccessorStub=*/false,
/*isImplicitlyDeclared=*/true,
/*isDefined=*/false, ObjCMethodDecl::Required,
/*HasRelatedResultType=*/false);
SmallVector<ParmVarDecl *, 2> Params;
ParmVarDecl *bytes =
ParmVarDecl::Create(Context, M,
SourceLocation(), SourceLocation(),
&Context.Idents.get("bytes"),
Context.VoidPtrTy.withConst(),
/*TInfo=*/nullptr,
SC_None, nullptr);
Params.push_back(bytes);
QualType ConstCharType = Context.CharTy.withConst();
ParmVarDecl *type =
ParmVarDecl::Create(Context, M,
SourceLocation(), SourceLocation(),
&Context.Idents.get("type"),
Context.getPointerType(ConstCharType),
/*TInfo=*/nullptr,
SC_None, nullptr);
Params.push_back(type);
M->setMethodParams(Context, Params, std::nullopt);
BoxingMethod = M;
}
if (!validateBoxingMethod(*this, Loc, NSValueDecl,
ValueWithBytesObjCType, BoxingMethod))
return ExprError();
ValueWithBytesObjCTypeMethod = BoxingMethod;
}
if (!ValueType.isTriviallyCopyableType(Context)) {
Diag(Loc, diag::err_objc_non_trivially_copyable_boxed_expression_type)
<< ValueType << ValueExpr->getSourceRange();
return ExprError();
}
BoxingMethod = ValueWithBytesObjCTypeMethod;
BoxedType = NSValuePointer;
}
if (!BoxingMethod) {
Diag(Loc, diag::err_objc_illegal_boxed_expression_type)
<< ValueType << ValueExpr->getSourceRange();
return ExprError();
}
DiagnoseUseOfDecl(BoxingMethod, Loc);
ExprResult ConvertedValueExpr;
if (ValueType->isObjCBoxableRecordType()) {
InitializedEntity IE = InitializedEntity::InitializeTemporary(ValueType);
ConvertedValueExpr = PerformCopyInitialization(IE, ValueExpr->getExprLoc(),
ValueExpr);
} else {
// Convert the expression to the type that the parameter requires.
ParmVarDecl *ParamDecl = BoxingMethod->parameters()[0];
InitializedEntity IE = InitializedEntity::InitializeParameter(Context,
ParamDecl);
ConvertedValueExpr = PerformCopyInitialization(IE, SourceLocation(),
ValueExpr);
}
if (ConvertedValueExpr.isInvalid())
return ExprError();
ValueExpr = ConvertedValueExpr.get();
ObjCBoxedExpr *BoxedExpr =
new (Context) ObjCBoxedExpr(ValueExpr, BoxedType,
BoxingMethod, SR);
return MaybeBindToTemporary(BoxedExpr);
}
/// Build an ObjC subscript pseudo-object expression, given that
/// that's supported by the runtime.
ExprResult Sema::BuildObjCSubscriptExpression(SourceLocation RB, Expr *BaseExpr,
Expr *IndexExpr,
ObjCMethodDecl *getterMethod,
ObjCMethodDecl *setterMethod) {
assert(!LangOpts.isSubscriptPointerArithmetic());
// We can't get dependent types here; our callers should have
// filtered them out.
assert((!BaseExpr->isTypeDependent() && !IndexExpr->isTypeDependent()) &&
"base or index cannot have dependent type here");
// Filter out placeholders in the index. In theory, overloads could
// be preserved here, although that might not actually work correctly.
ExprResult Result = CheckPlaceholderExpr(IndexExpr);
if (Result.isInvalid())
return ExprError();
IndexExpr = Result.get();
// Perform lvalue-to-rvalue conversion on the base.
Result = DefaultLvalueConversion(BaseExpr);
if (Result.isInvalid())
return ExprError();
BaseExpr = Result.get();
// Build the pseudo-object expression.
return new (Context) ObjCSubscriptRefExpr(
BaseExpr, IndexExpr, Context.PseudoObjectTy, VK_LValue, OK_ObjCSubscript,
getterMethod, setterMethod, RB);
}
ExprResult Sema::BuildObjCArrayLiteral(SourceRange SR, MultiExprArg Elements) {
SourceLocation Loc = SR.getBegin();
if (!NSArrayDecl) {
NSArrayDecl = LookupObjCInterfaceDeclForLiteral(*this, Loc,
Sema::LK_Array);
if (!NSArrayDecl) {
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);
ObjCMethodDecl *Method = NSArrayDecl->lookupClassMethod(Sel);
if (!Method && getLangOpts().DebuggerObjCLiteral) {
TypeSourceInfo *ReturnTInfo = nullptr;
Method = ObjCMethodDecl::Create(
Context, SourceLocation(), SourceLocation(), Sel, IdT, ReturnTInfo,
Context.getTranslationUnitDecl(), false /*Instance*/,
false /*isVariadic*/,
/*isPropertyAccessor=*/false, /*isSynthesizedAccessorStub=*/false,
/*isImplicitlyDeclared=*/true, /*isDefined=*/false,
ObjCMethodDecl::Required, false);
SmallVector<ParmVarDecl *, 2> Params;
ParmVarDecl *objects = ParmVarDecl::Create(Context, Method,
SourceLocation(),
SourceLocation(),
&Context.Idents.get("objects"),
Context.getPointerType(IdT),
/*TInfo=*/nullptr,
SC_None, nullptr);
Params.push_back(objects);
ParmVarDecl *cnt = ParmVarDecl::Create(Context, Method,
SourceLocation(),
SourceLocation(),
&Context.Idents.get("cnt"),
Context.UnsignedLongTy,
/*TInfo=*/nullptr, SC_None,
nullptr);
Params.push_back(cnt);
Method->setMethodParams(Context, Params, std::nullopt);
}
if (!validateBoxingMethod(*this, Loc, NSArrayDecl, Sel, Method))
return ExprError();
// Dig out the type that all elements should be converted to.
QualType T = Method->parameters()[0]->getType();
const PointerType *PtrT = T->getAs<PointerType>();
if (!PtrT ||
!Context.hasSameUnqualifiedType(PtrT->getPointeeType(), IdT)) {
Diag(SR.getBegin(), diag::err_objc_literal_method_sig)
<< Sel;
Diag(Method->parameters()[0]->getLocation(),
diag::note_objc_literal_method_param)
<< 0 << T
<< Context.getPointerType(IdT.withConst());
return ExprError();
}
// Check that the 'count' parameter is integral.
if (!Method->parameters()[1]->getType()->isIntegerType()) {
Diag(SR.getBegin(), diag::err_objc_literal_method_sig)
<< Sel;
Diag(Method->parameters()[1]->getLocation(),
diag::note_objc_literal_method_param)
<< 1
<< Method->parameters()[1]->getType()
<< "integral";
return ExprError();
}
// We've found a good +arrayWithObjects:count: method. Save it!
ArrayWithObjectsMethod = Method;
}
QualType ObjectsType = ArrayWithObjectsMethod->parameters()[0]->getType();
QualType RequiredType = ObjectsType->castAs<PointerType>()->getPointeeType();
// Check that each of the elements provided is valid in a collection literal,
// performing conversions as necessary.
Expr **ElementsBuffer = Elements.data();
for (unsigned I = 0, N = Elements.size(); I != N; ++I) {
ExprResult Converted = CheckObjCCollectionLiteralElement(*this,
ElementsBuffer[I],
RequiredType, true);
if (Converted.isInvalid())
return ExprError();
ElementsBuffer[I] = Converted.get();
}
QualType Ty
= Context.getObjCObjectPointerType(
Context.getObjCInterfaceType(NSArrayDecl));
return MaybeBindToTemporary(
ObjCArrayLiteral::Create(Context, Elements, Ty,
ArrayWithObjectsMethod, SR));
}
/// Check for duplicate keys in an ObjC dictionary literal. For instance:
/// NSDictionary *nd = @{ @"foo" : @"bar", @"foo" : @"baz" };
static void
CheckObjCDictionaryLiteralDuplicateKeys(Sema &S,
ObjCDictionaryLiteral *Literal) {
if (Literal->isValueDependent() || Literal->isTypeDependent())
return;
// NSNumber has quite relaxed equality semantics (for instance, @YES is
// considered equal to @1.0). For now, ignore floating points and just do a
// bit-width and sign agnostic integer compare.
struct APSIntCompare {
bool operator()(const llvm::APSInt &LHS, const llvm::APSInt &RHS) const {
return llvm::APSInt::compareValues(LHS, RHS) < 0;
}
};
llvm::DenseMap<StringRef, SourceLocation> StringKeys;
std::map<llvm::APSInt, SourceLocation, APSIntCompare> IntegralKeys;
auto checkOneKey = [&](auto &Map, const auto &Key, SourceLocation Loc) {
auto Pair = Map.insert({Key, Loc});
if (!Pair.second) {
S.Diag(Loc, diag::warn_nsdictionary_duplicate_key);
S.Diag(Pair.first->second, diag::note_nsdictionary_duplicate_key_here);
}
};
for (unsigned Idx = 0, End = Literal->getNumElements(); Idx != End; ++Idx) {
Expr *Key = Literal->getKeyValueElement(Idx).Key->IgnoreParenImpCasts();
if (auto *StrLit = dyn_cast<ObjCStringLiteral>(Key)) {
StringRef Bytes = StrLit->getString()->getBytes();
SourceLocation Loc = StrLit->getExprLoc();
checkOneKey(StringKeys, Bytes, Loc);
}
if (auto *BE = dyn_cast<ObjCBoxedExpr>(Key)) {
Expr *Boxed = BE->getSubExpr();
SourceLocation Loc = BE->getExprLoc();
// Check for @("foo").
if (auto *Str = dyn_cast<StringLiteral>(Boxed->IgnoreParenImpCasts())) {
checkOneKey(StringKeys, Str->getBytes(), Loc);
continue;
}
Expr::EvalResult Result;
if (Boxed->EvaluateAsInt(Result, S.getASTContext(),
Expr::SE_AllowSideEffects)) {
checkOneKey(IntegralKeys, Result.Val.getInt(), Loc);
}
}
}
}
ExprResult Sema::BuildObjCDictionaryLiteral(SourceRange SR,
MutableArrayRef<ObjCDictionaryElement> Elements) {
SourceLocation Loc = SR.getBegin();
if (!NSDictionaryDecl) {
NSDictionaryDecl = LookupObjCInterfaceDeclForLiteral(*this, Loc,
Sema::LK_Dictionary);
if (!NSDictionaryDecl) {
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);
ObjCMethodDecl *Method = NSDictionaryDecl->lookupClassMethod(Sel);
if (!Method && getLangOpts().DebuggerObjCLiteral) {
Method = ObjCMethodDecl::Create(
Context, SourceLocation(), SourceLocation(), Sel, IdT,
nullptr /*TypeSourceInfo */, Context.getTranslationUnitDecl(),
false /*Instance*/, false /*isVariadic*/,
/*isPropertyAccessor=*/false,
/*isSynthesizedAccessorStub=*/false,
/*isImplicitlyDeclared=*/true, /*isDefined=*/false,
ObjCMethodDecl::Required, false);
SmallVector<ParmVarDecl *, 3> Params;
ParmVarDecl *objects = ParmVarDecl::Create(Context, Method,
SourceLocation(),
SourceLocation(),
&Context.Idents.get("objects"),
Context.getPointerType(IdT),
/*TInfo=*/nullptr, SC_None,
nullptr);
Params.push_back(objects);
ParmVarDecl *keys = ParmVarDecl::Create(Context, Method,
SourceLocation(),
SourceLocation(),
&Context.Idents.get("keys"),
Context.getPointerType(IdT),
/*TInfo=*/nullptr, SC_None,
nullptr);
Params.push_back(keys);
ParmVarDecl *cnt = ParmVarDecl::Create(Context, Method,
SourceLocation(),