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clang-p2996/clang/lib/Sema/SemaObjC.cpp
Vlad Serebrennikov 31a203fa8a [clang] Introduce SemaObjC (#89086) 
This is continuation of efforts to split `Sema` up, following the
example of OpenMP, OpenACC, etc. Context can be found in
https://github.com/llvm/llvm-project/pull/82217 and
https://github.com/llvm/llvm-project/pull/84184.

I split formatting changes into a separate commit to help reviewing the
actual changes.
2024-05-13 23:37:59 +04:00

1487 lines
51 KiB
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//===----- SemaObjC.cpp ---- Semantic Analysis for Objective-C ------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
/// \file
/// This file implements semantic analysis for Objective-C.
///
//===----------------------------------------------------------------------===//
#include "clang/Sema/SemaObjC.h"
#include "clang/AST/EvaluatedExprVisitor.h"
#include "clang/AST/StmtObjC.h"
#include "clang/Basic/DiagnosticSema.h"
#include "clang/Lex/Preprocessor.h"
#include "clang/Sema/ScopeInfo.h"
#include "clang/Sema/Sema.h"
#include "clang/Sema/TemplateDeduction.h"
#include "llvm/Support/ConvertUTF.h"
namespace clang {
SemaObjC::SemaObjC(Sema &S)
: SemaBase(S), NSNumberDecl(nullptr), NSValueDecl(nullptr),
NSStringDecl(nullptr), StringWithUTF8StringMethod(nullptr),
ValueWithBytesObjCTypeMethod(nullptr), NSArrayDecl(nullptr),
ArrayWithObjectsMethod(nullptr), NSDictionaryDecl(nullptr),
DictionaryWithObjectsMethod(nullptr) {}
StmtResult SemaObjC::ActOnObjCForCollectionStmt(SourceLocation ForLoc,
Stmt *First, Expr *collection,
SourceLocation RParenLoc) {
ASTContext &Context = getASTContext();
SemaRef.setFunctionHasBranchProtectedScope();
ExprResult CollectionExprResult =
CheckObjCForCollectionOperand(ForLoc, collection);
if (First) {
QualType FirstType;
if (DeclStmt *DS = dyn_cast<DeclStmt>(First)) {
if (!DS->isSingleDecl())
return StmtError(Diag((*DS->decl_begin())->getLocation(),
diag::err_toomany_element_decls));
VarDecl *D = dyn_cast<VarDecl>(DS->getSingleDecl());
if (!D || D->isInvalidDecl())
return StmtError();
FirstType = D->getType();
// C99 6.8.5p3: The declaration part of a 'for' statement shall only
// declare identifiers for objects having storage class 'auto' or
// 'register'.
if (!D->hasLocalStorage())
return StmtError(
Diag(D->getLocation(), diag::err_non_local_variable_decl_in_for));
// If the type contained 'auto', deduce the 'auto' to 'id'.
if (FirstType->getContainedAutoType()) {
SourceLocation Loc = D->getLocation();
OpaqueValueExpr OpaqueId(Loc, Context.getObjCIdType(), VK_PRValue);
Expr *DeducedInit = &OpaqueId;
sema::TemplateDeductionInfo Info(Loc);
FirstType = QualType();
TemplateDeductionResult Result = SemaRef.DeduceAutoType(
D->getTypeSourceInfo()->getTypeLoc(), DeducedInit, FirstType, Info);
if (Result != TemplateDeductionResult::Success &&
Result != TemplateDeductionResult::AlreadyDiagnosed)
SemaRef.DiagnoseAutoDeductionFailure(D, DeducedInit);
if (FirstType.isNull()) {
D->setInvalidDecl();
return StmtError();
}
D->setType(FirstType);
if (!SemaRef.inTemplateInstantiation()) {
SourceLocation Loc =
D->getTypeSourceInfo()->getTypeLoc().getBeginLoc();
Diag(Loc, diag::warn_auto_var_is_id) << D->getDeclName();
}
}
} else {
Expr *FirstE = cast<Expr>(First);
if (!FirstE->isTypeDependent() && !FirstE->isLValue())
return StmtError(
Diag(First->getBeginLoc(), diag::err_selector_element_not_lvalue)
<< First->getSourceRange());
FirstType = static_cast<Expr *>(First)->getType();
if (FirstType.isConstQualified())
Diag(ForLoc, diag::err_selector_element_const_type)
<< FirstType << First->getSourceRange();
}
if (!FirstType->isDependentType() &&
!FirstType->isObjCObjectPointerType() &&
!FirstType->isBlockPointerType())
return StmtError(Diag(ForLoc, diag::err_selector_element_type)
<< FirstType << First->getSourceRange());
}
if (CollectionExprResult.isInvalid())
return StmtError();
CollectionExprResult = SemaRef.ActOnFinishFullExpr(CollectionExprResult.get(),
/*DiscardedValue*/ false);
if (CollectionExprResult.isInvalid())
return StmtError();
return new (Context) ObjCForCollectionStmt(First, CollectionExprResult.get(),
nullptr, ForLoc, RParenLoc);
}
ExprResult SemaObjC::CheckObjCForCollectionOperand(SourceLocation forLoc,
Expr *collection) {
ASTContext &Context = getASTContext();
if (!collection)
return ExprError();
ExprResult result = SemaRef.CorrectDelayedTyposInExpr(collection);
if (!result.isUsable())
return ExprError();
collection = result.get();
// Bail out early if we've got a type-dependent expression.
if (collection->isTypeDependent())
return collection;
// Perform normal l-value conversion.
result = SemaRef.DefaultFunctionArrayLvalueConversion(collection);
if (result.isInvalid())
return ExprError();
collection = result.get();
// The operand needs to have object-pointer type.
// TODO: should we do a contextual conversion?
const ObjCObjectPointerType *pointerType =
collection->getType()->getAs<ObjCObjectPointerType>();
if (!pointerType)
return Diag(forLoc, diag::err_collection_expr_type)
<< collection->getType() << collection->getSourceRange();
// Check that the operand provides
// - countByEnumeratingWithState:objects:count:
const ObjCObjectType *objectType = pointerType->getObjectType();
ObjCInterfaceDecl *iface = objectType->getInterface();
// If we have a forward-declared type, we can't do this check.
// Under ARC, it is an error not to have a forward-declared class.
if (iface &&
(getLangOpts().ObjCAutoRefCount
? SemaRef.RequireCompleteType(forLoc, QualType(objectType, 0),
diag::err_arc_collection_forward,
collection)
: !SemaRef.isCompleteType(forLoc, QualType(objectType, 0)))) {
// Otherwise, if we have any useful type information, check that
// the type declares the appropriate method.
} else if (iface || !objectType->qual_empty()) {
const IdentifierInfo *selectorIdents[] = {
&Context.Idents.get("countByEnumeratingWithState"),
&Context.Idents.get("objects"), &Context.Idents.get("count")};
Selector selector = Context.Selectors.getSelector(3, &selectorIdents[0]);
ObjCMethodDecl *method = nullptr;
// If there's an interface, look in both the public and private APIs.
if (iface) {
method = iface->lookupInstanceMethod(selector);
if (!method)
method = iface->lookupPrivateMethod(selector);
}
// Also check protocol qualifiers.
if (!method)
method = LookupMethodInQualifiedType(selector, pointerType,
/*instance*/ true);
// If we didn't find it anywhere, give up.
if (!method) {
Diag(forLoc, diag::warn_collection_expr_type)
<< collection->getType() << selector << collection->getSourceRange();
}
// TODO: check for an incompatible signature?
}
// Wrap up any cleanups in the expression.
return collection;
}
StmtResult SemaObjC::FinishObjCForCollectionStmt(Stmt *S, Stmt *B) {
if (!S || !B)
return StmtError();
ObjCForCollectionStmt *ForStmt = cast<ObjCForCollectionStmt>(S);
ForStmt->setBody(B);
return S;
}
StmtResult SemaObjC::ActOnObjCAtCatchStmt(SourceLocation AtLoc,
SourceLocation RParen, Decl *Parm,
Stmt *Body) {
ASTContext &Context = getASTContext();
VarDecl *Var = cast_or_null<VarDecl>(Parm);
if (Var && Var->isInvalidDecl())
return StmtError();
return new (Context) ObjCAtCatchStmt(AtLoc, RParen, Var, Body);
}
StmtResult SemaObjC::ActOnObjCAtFinallyStmt(SourceLocation AtLoc, Stmt *Body) {
ASTContext &Context = getASTContext();
return new (Context) ObjCAtFinallyStmt(AtLoc, Body);
}
StmtResult SemaObjC::ActOnObjCAtTryStmt(SourceLocation AtLoc, Stmt *Try,
MultiStmtArg CatchStmts,
Stmt *Finally) {
ASTContext &Context = getASTContext();
if (!getLangOpts().ObjCExceptions)
Diag(AtLoc, diag::err_objc_exceptions_disabled) << "@try";
// Objective-C try is incompatible with SEH __try.
sema::FunctionScopeInfo *FSI = SemaRef.getCurFunction();
if (FSI->FirstSEHTryLoc.isValid()) {
Diag(AtLoc, diag::err_mixing_cxx_try_seh_try) << 1;
Diag(FSI->FirstSEHTryLoc, diag::note_conflicting_try_here) << "'__try'";
}
FSI->setHasObjCTry(AtLoc);
unsigned NumCatchStmts = CatchStmts.size();
return ObjCAtTryStmt::Create(Context, AtLoc, Try, CatchStmts.data(),
NumCatchStmts, Finally);
}
StmtResult SemaObjC::BuildObjCAtThrowStmt(SourceLocation AtLoc, Expr *Throw) {
ASTContext &Context = getASTContext();
if (Throw) {
ExprResult Result = SemaRef.DefaultLvalueConversion(Throw);
if (Result.isInvalid())
return StmtError();
Result =
SemaRef.ActOnFinishFullExpr(Result.get(), /*DiscardedValue*/ false);
if (Result.isInvalid())
return StmtError();
Throw = Result.get();
QualType ThrowType = Throw->getType();
// Make sure the expression type is an ObjC pointer or "void *".
if (!ThrowType->isDependentType() &&
!ThrowType->isObjCObjectPointerType()) {
const PointerType *PT = ThrowType->getAs<PointerType>();
if (!PT || !PT->getPointeeType()->isVoidType())
return StmtError(Diag(AtLoc, diag::err_objc_throw_expects_object)
<< Throw->getType() << Throw->getSourceRange());
}
}
return new (Context) ObjCAtThrowStmt(AtLoc, Throw);
}
StmtResult SemaObjC::ActOnObjCAtThrowStmt(SourceLocation AtLoc, Expr *Throw,
Scope *CurScope) {
if (!getLangOpts().ObjCExceptions)
Diag(AtLoc, diag::err_objc_exceptions_disabled) << "@throw";
if (!Throw) {
// @throw without an expression designates a rethrow (which must occur
// in the context of an @catch clause).
Scope *AtCatchParent = CurScope;
while (AtCatchParent && !AtCatchParent->isAtCatchScope())
AtCatchParent = AtCatchParent->getParent();
if (!AtCatchParent)
return StmtError(Diag(AtLoc, diag::err_rethrow_used_outside_catch));
}
return BuildObjCAtThrowStmt(AtLoc, Throw);
}
ExprResult SemaObjC::ActOnObjCAtSynchronizedOperand(SourceLocation atLoc,
Expr *operand) {
ExprResult result = SemaRef.DefaultLvalueConversion(operand);
if (result.isInvalid())
return ExprError();
operand = result.get();
// Make sure the expression type is an ObjC pointer or "void *".
QualType type = operand->getType();
if (!type->isDependentType() && !type->isObjCObjectPointerType()) {
const PointerType *pointerType = type->getAs<PointerType>();
if (!pointerType || !pointerType->getPointeeType()->isVoidType()) {
if (getLangOpts().CPlusPlus) {
if (SemaRef.RequireCompleteType(atLoc, type,
diag::err_incomplete_receiver_type))
return Diag(atLoc, diag::err_objc_synchronized_expects_object)
<< type << operand->getSourceRange();
ExprResult result =
SemaRef.PerformContextuallyConvertToObjCPointer(operand);
if (result.isInvalid())
return ExprError();
if (!result.isUsable())
return Diag(atLoc, diag::err_objc_synchronized_expects_object)
<< type << operand->getSourceRange();
operand = result.get();
} else {
return Diag(atLoc, diag::err_objc_synchronized_expects_object)
<< type << operand->getSourceRange();
}
}
}
// The operand to @synchronized is a full-expression.
return SemaRef.ActOnFinishFullExpr(operand, /*DiscardedValue*/ false);
}
StmtResult SemaObjC::ActOnObjCAtSynchronizedStmt(SourceLocation AtLoc,
Expr *SyncExpr,
Stmt *SyncBody) {
ASTContext &Context = getASTContext();
// We can't jump into or indirect-jump out of a @synchronized block.
SemaRef.setFunctionHasBranchProtectedScope();
return new (Context) ObjCAtSynchronizedStmt(AtLoc, SyncExpr, SyncBody);
}
StmtResult SemaObjC::ActOnObjCAutoreleasePoolStmt(SourceLocation AtLoc,
Stmt *Body) {
ASTContext &Context = getASTContext();
SemaRef.setFunctionHasBranchProtectedScope();
return new (Context) ObjCAutoreleasePoolStmt(AtLoc, Body);
}
TypeResult SemaObjC::actOnObjCProtocolQualifierType(
SourceLocation lAngleLoc, ArrayRef<Decl *> protocols,
ArrayRef<SourceLocation> protocolLocs, SourceLocation rAngleLoc) {
ASTContext &Context = getASTContext();
// Form id<protocol-list>.
QualType Result = Context.getObjCObjectType(
Context.ObjCBuiltinIdTy, {},
llvm::ArrayRef((ObjCProtocolDecl *const *)protocols.data(),
protocols.size()),
false);
Result = Context.getObjCObjectPointerType(Result);
TypeSourceInfo *ResultTInfo = Context.CreateTypeSourceInfo(Result);
TypeLoc ResultTL = ResultTInfo->getTypeLoc();
auto ObjCObjectPointerTL = ResultTL.castAs<ObjCObjectPointerTypeLoc>();
ObjCObjectPointerTL.setStarLoc(SourceLocation()); // implicit
auto ObjCObjectTL =
ObjCObjectPointerTL.getPointeeLoc().castAs<ObjCObjectTypeLoc>();
ObjCObjectTL.setHasBaseTypeAsWritten(false);
ObjCObjectTL.getBaseLoc().initialize(Context, SourceLocation());
// No type arguments.
ObjCObjectTL.setTypeArgsLAngleLoc(SourceLocation());
ObjCObjectTL.setTypeArgsRAngleLoc(SourceLocation());
// Fill in protocol qualifiers.
ObjCObjectTL.setProtocolLAngleLoc(lAngleLoc);
ObjCObjectTL.setProtocolRAngleLoc(rAngleLoc);
for (unsigned i = 0, n = protocols.size(); i != n; ++i)
ObjCObjectTL.setProtocolLoc(i, protocolLocs[i]);
// We're done. Return the completed type to the parser.
return SemaRef.CreateParsedType(Result, ResultTInfo);
}
TypeResult SemaObjC::actOnObjCTypeArgsAndProtocolQualifiers(
Scope *S, SourceLocation Loc, ParsedType BaseType,
SourceLocation TypeArgsLAngleLoc, ArrayRef<ParsedType> TypeArgs,
SourceLocation TypeArgsRAngleLoc, SourceLocation ProtocolLAngleLoc,
ArrayRef<Decl *> Protocols, ArrayRef<SourceLocation> ProtocolLocs,
SourceLocation ProtocolRAngleLoc) {
ASTContext &Context = getASTContext();
TypeSourceInfo *BaseTypeInfo = nullptr;
QualType T = SemaRef.GetTypeFromParser(BaseType, &BaseTypeInfo);
if (T.isNull())
return true;
// Handle missing type-source info.
if (!BaseTypeInfo)
BaseTypeInfo = Context.getTrivialTypeSourceInfo(T, Loc);
// Extract type arguments.
SmallVector<TypeSourceInfo *, 4> ActualTypeArgInfos;
for (unsigned i = 0, n = TypeArgs.size(); i != n; ++i) {
TypeSourceInfo *TypeArgInfo = nullptr;
QualType TypeArg = SemaRef.GetTypeFromParser(TypeArgs[i], &TypeArgInfo);
if (TypeArg.isNull()) {
ActualTypeArgInfos.clear();
break;
}
assert(TypeArgInfo && "No type source info?");
ActualTypeArgInfos.push_back(TypeArgInfo);
}
// Build the object type.
QualType Result = BuildObjCObjectType(
T, BaseTypeInfo->getTypeLoc().getSourceRange().getBegin(),
TypeArgsLAngleLoc, ActualTypeArgInfos, TypeArgsRAngleLoc,
ProtocolLAngleLoc,
llvm::ArrayRef((ObjCProtocolDecl *const *)Protocols.data(),
Protocols.size()),
ProtocolLocs, ProtocolRAngleLoc,
/*FailOnError=*/false,
/*Rebuilding=*/false);
if (Result == T)
return BaseType;
// Create source information for this type.
TypeSourceInfo *ResultTInfo = Context.CreateTypeSourceInfo(Result);
TypeLoc ResultTL = ResultTInfo->getTypeLoc();
// For id<Proto1, Proto2> or Class<Proto1, Proto2>, we'll have an
// object pointer type. Fill in source information for it.
if (auto ObjCObjectPointerTL = ResultTL.getAs<ObjCObjectPointerTypeLoc>()) {
// The '*' is implicit.
ObjCObjectPointerTL.setStarLoc(SourceLocation());
ResultTL = ObjCObjectPointerTL.getPointeeLoc();
}
if (auto OTPTL = ResultTL.getAs<ObjCTypeParamTypeLoc>()) {
// Protocol qualifier information.
if (OTPTL.getNumProtocols() > 0) {
assert(OTPTL.getNumProtocols() == Protocols.size());
OTPTL.setProtocolLAngleLoc(ProtocolLAngleLoc);
OTPTL.setProtocolRAngleLoc(ProtocolRAngleLoc);
for (unsigned i = 0, n = Protocols.size(); i != n; ++i)
OTPTL.setProtocolLoc(i, ProtocolLocs[i]);
}
// We're done. Return the completed type to the parser.
return SemaRef.CreateParsedType(Result, ResultTInfo);
}
auto ObjCObjectTL = ResultTL.castAs<ObjCObjectTypeLoc>();
// Type argument information.
if (ObjCObjectTL.getNumTypeArgs() > 0) {
assert(ObjCObjectTL.getNumTypeArgs() == ActualTypeArgInfos.size());
ObjCObjectTL.setTypeArgsLAngleLoc(TypeArgsLAngleLoc);
ObjCObjectTL.setTypeArgsRAngleLoc(TypeArgsRAngleLoc);
for (unsigned i = 0, n = ActualTypeArgInfos.size(); i != n; ++i)
ObjCObjectTL.setTypeArgTInfo(i, ActualTypeArgInfos[i]);
} else {
ObjCObjectTL.setTypeArgsLAngleLoc(SourceLocation());
ObjCObjectTL.setTypeArgsRAngleLoc(SourceLocation());
}
// Protocol qualifier information.
if (ObjCObjectTL.getNumProtocols() > 0) {
assert(ObjCObjectTL.getNumProtocols() == Protocols.size());
ObjCObjectTL.setProtocolLAngleLoc(ProtocolLAngleLoc);
ObjCObjectTL.setProtocolRAngleLoc(ProtocolRAngleLoc);
for (unsigned i = 0, n = Protocols.size(); i != n; ++i)
ObjCObjectTL.setProtocolLoc(i, ProtocolLocs[i]);
} else {
ObjCObjectTL.setProtocolLAngleLoc(SourceLocation());
ObjCObjectTL.setProtocolRAngleLoc(SourceLocation());
}
// Base type.
ObjCObjectTL.setHasBaseTypeAsWritten(true);
if (ObjCObjectTL.getType() == T)
ObjCObjectTL.getBaseLoc().initializeFullCopy(BaseTypeInfo->getTypeLoc());
else
ObjCObjectTL.getBaseLoc().initialize(Context, Loc);
// We're done. Return the completed type to the parser.
return SemaRef.CreateParsedType(Result, ResultTInfo);
}
QualType SemaObjC::BuildObjCTypeParamType(
const ObjCTypeParamDecl *Decl, SourceLocation ProtocolLAngleLoc,
ArrayRef<ObjCProtocolDecl *> Protocols,
ArrayRef<SourceLocation> ProtocolLocs, SourceLocation ProtocolRAngleLoc,
bool FailOnError) {
ASTContext &Context = getASTContext();
QualType Result = QualType(Decl->getTypeForDecl(), 0);
if (!Protocols.empty()) {
bool HasError;
Result = Context.applyObjCProtocolQualifiers(Result, Protocols, HasError);
if (HasError) {
Diag(SourceLocation(), diag::err_invalid_protocol_qualifiers)
<< SourceRange(ProtocolLAngleLoc, ProtocolRAngleLoc);
if (FailOnError)
Result = QualType();
}
if (FailOnError && Result.isNull())
return QualType();
}
return Result;
}
/// Apply Objective-C type arguments to the given type.
static QualType applyObjCTypeArgs(Sema &S, SourceLocation loc, QualType type,
ArrayRef<TypeSourceInfo *> typeArgs,
SourceRange typeArgsRange, bool failOnError,
bool rebuilding) {
// We can only apply type arguments to an Objective-C class type.
const auto *objcObjectType = type->getAs<ObjCObjectType>();
if (!objcObjectType || !objcObjectType->getInterface()) {
S.Diag(loc, diag::err_objc_type_args_non_class) << type << typeArgsRange;
if (failOnError)
return QualType();
return type;
}
// The class type must be parameterized.
ObjCInterfaceDecl *objcClass = objcObjectType->getInterface();
ObjCTypeParamList *typeParams = objcClass->getTypeParamList();
if (!typeParams) {
S.Diag(loc, diag::err_objc_type_args_non_parameterized_class)
<< objcClass->getDeclName() << FixItHint::CreateRemoval(typeArgsRange);
if (failOnError)
return QualType();
return type;
}
// The type must not already be specialized.
if (objcObjectType->isSpecialized()) {
S.Diag(loc, diag::err_objc_type_args_specialized_class)
<< type << FixItHint::CreateRemoval(typeArgsRange);
if (failOnError)
return QualType();
return type;
}
// Check the type arguments.
SmallVector<QualType, 4> finalTypeArgs;
unsigned numTypeParams = typeParams->size();
bool anyPackExpansions = false;
for (unsigned i = 0, n = typeArgs.size(); i != n; ++i) {
TypeSourceInfo *typeArgInfo = typeArgs[i];
QualType typeArg = typeArgInfo->getType();
// Type arguments cannot have explicit qualifiers or nullability.
// We ignore indirect sources of these, e.g. behind typedefs or
// template arguments.
if (TypeLoc qual = typeArgInfo->getTypeLoc().findExplicitQualifierLoc()) {
bool diagnosed = false;
SourceRange rangeToRemove;
if (auto attr = qual.getAs<AttributedTypeLoc>()) {
rangeToRemove = attr.getLocalSourceRange();
if (attr.getTypePtr()->getImmediateNullability()) {
typeArg = attr.getTypePtr()->getModifiedType();
S.Diag(attr.getBeginLoc(),
diag::err_objc_type_arg_explicit_nullability)
<< typeArg << FixItHint::CreateRemoval(rangeToRemove);
diagnosed = true;
}
}
// When rebuilding, qualifiers might have gotten here through a
// final substitution.
if (!rebuilding && !diagnosed) {
S.Diag(qual.getBeginLoc(), diag::err_objc_type_arg_qualified)
<< typeArg << typeArg.getQualifiers().getAsString()
<< FixItHint::CreateRemoval(rangeToRemove);
}
}
// Remove qualifiers even if they're non-local.
typeArg = typeArg.getUnqualifiedType();
finalTypeArgs.push_back(typeArg);
if (typeArg->getAs<PackExpansionType>())
anyPackExpansions = true;
// Find the corresponding type parameter, if there is one.
ObjCTypeParamDecl *typeParam = nullptr;
if (!anyPackExpansions) {
if (i < numTypeParams) {
typeParam = typeParams->begin()[i];
} else {
// Too many arguments.
S.Diag(loc, diag::err_objc_type_args_wrong_arity)
<< false << objcClass->getDeclName() << (unsigned)typeArgs.size()
<< numTypeParams;
S.Diag(objcClass->getLocation(), diag::note_previous_decl) << objcClass;
if (failOnError)
return QualType();
return type;
}
}
// Objective-C object pointer types must be substitutable for the bounds.
if (const auto *typeArgObjC = typeArg->getAs<ObjCObjectPointerType>()) {
// If we don't have a type parameter to match against, assume
// everything is fine. There was a prior pack expansion that
// means we won't be able to match anything.
if (!typeParam) {
assert(anyPackExpansions && "Too many arguments?");
continue;
}
// Retrieve the bound.
QualType bound = typeParam->getUnderlyingType();
const auto *boundObjC = bound->castAs<ObjCObjectPointerType>();
// Determine whether the type argument is substitutable for the bound.
if (typeArgObjC->isObjCIdType()) {
// When the type argument is 'id', the only acceptable type
// parameter bound is 'id'.
if (boundObjC->isObjCIdType())
continue;
} else if (S.Context.canAssignObjCInterfaces(boundObjC, typeArgObjC)) {
// Otherwise, we follow the assignability rules.
continue;
}
// Diagnose the mismatch.
S.Diag(typeArgInfo->getTypeLoc().getBeginLoc(),
diag::err_objc_type_arg_does_not_match_bound)
<< typeArg << bound << typeParam->getDeclName();
S.Diag(typeParam->getLocation(), diag::note_objc_type_param_here)
<< typeParam->getDeclName();
if (failOnError)
return QualType();
return type;
}
// Block pointer types are permitted for unqualified 'id' bounds.
if (typeArg->isBlockPointerType()) {
// If we don't have a type parameter to match against, assume
// everything is fine. There was a prior pack expansion that
// means we won't be able to match anything.
if (!typeParam) {
assert(anyPackExpansions && "Too many arguments?");
continue;
}
// Retrieve the bound.
QualType bound = typeParam->getUnderlyingType();
if (bound->isBlockCompatibleObjCPointerType(S.Context))
continue;
// Diagnose the mismatch.
S.Diag(typeArgInfo->getTypeLoc().getBeginLoc(),
diag::err_objc_type_arg_does_not_match_bound)
<< typeArg << bound << typeParam->getDeclName();
S.Diag(typeParam->getLocation(), diag::note_objc_type_param_here)
<< typeParam->getDeclName();
if (failOnError)
return QualType();
return type;
}
// Types that have __attribute__((NSObject)) are permitted.
if (typeArg->isObjCNSObjectType()) {
continue;
}
// Dependent types will be checked at instantiation time.
if (typeArg->isDependentType()) {
continue;
}
// Diagnose non-id-compatible type arguments.
S.Diag(typeArgInfo->getTypeLoc().getBeginLoc(),
diag::err_objc_type_arg_not_id_compatible)
<< typeArg << typeArgInfo->getTypeLoc().getSourceRange();
if (failOnError)
return QualType();
return type;
}
// Make sure we didn't have the wrong number of arguments.
if (!anyPackExpansions && finalTypeArgs.size() != numTypeParams) {
S.Diag(loc, diag::err_objc_type_args_wrong_arity)
<< (typeArgs.size() < typeParams->size()) << objcClass->getDeclName()
<< (unsigned)finalTypeArgs.size() << (unsigned)numTypeParams;
S.Diag(objcClass->getLocation(), diag::note_previous_decl) << objcClass;
if (failOnError)
return QualType();
return type;
}
// Success. Form the specialized type.
return S.Context.getObjCObjectType(type, finalTypeArgs, {}, false);
}
QualType SemaObjC::BuildObjCObjectType(
QualType BaseType, SourceLocation Loc, SourceLocation TypeArgsLAngleLoc,
ArrayRef<TypeSourceInfo *> TypeArgs, SourceLocation TypeArgsRAngleLoc,
SourceLocation ProtocolLAngleLoc, ArrayRef<ObjCProtocolDecl *> Protocols,
ArrayRef<SourceLocation> ProtocolLocs, SourceLocation ProtocolRAngleLoc,
bool FailOnError, bool Rebuilding) {
ASTContext &Context = getASTContext();
QualType Result = BaseType;
if (!TypeArgs.empty()) {
Result =
applyObjCTypeArgs(SemaRef, Loc, Result, TypeArgs,
SourceRange(TypeArgsLAngleLoc, TypeArgsRAngleLoc),
FailOnError, Rebuilding);
if (FailOnError && Result.isNull())
return QualType();
}
if (!Protocols.empty()) {
bool HasError;
Result = Context.applyObjCProtocolQualifiers(Result, Protocols, HasError);
if (HasError) {
Diag(Loc, diag::err_invalid_protocol_qualifiers)
<< SourceRange(ProtocolLAngleLoc, ProtocolRAngleLoc);
if (FailOnError)
Result = QualType();
}
if (FailOnError && Result.isNull())
return QualType();
}
return Result;
}
ParsedType SemaObjC::ActOnObjCInstanceType(SourceLocation Loc) {
ASTContext &Context = getASTContext();
QualType T = Context.getObjCInstanceType();
TypeSourceInfo *TInfo = Context.getTrivialTypeSourceInfo(T, Loc);
return SemaRef.CreateParsedType(T, TInfo);
}
//===--- CHECK: Objective-C retain cycles ----------------------------------//
namespace {
struct RetainCycleOwner {
VarDecl *Variable = nullptr;
SourceRange Range;
SourceLocation Loc;
bool Indirect = false;
RetainCycleOwner() = default;
void setLocsFrom(Expr *e) {
Loc = e->getExprLoc();
Range = e->getSourceRange();
}
};
} // namespace
/// Consider whether capturing the given variable can possibly lead to
/// a retain cycle.
static bool considerVariable(VarDecl *var, Expr *ref, RetainCycleOwner &owner) {
// In ARC, it's captured strongly iff the variable has __strong
// lifetime. In MRR, it's captured strongly if the variable is
// __block and has an appropriate type.
if (var->getType().getObjCLifetime() != Qualifiers::OCL_Strong)
return false;
owner.Variable = var;
if (ref)
owner.setLocsFrom(ref);
return true;
}
static bool findRetainCycleOwner(Sema &S, Expr *e, RetainCycleOwner &owner) {
while (true) {
e = e->IgnoreParens();
if (CastExpr *cast = dyn_cast<CastExpr>(e)) {
switch (cast->getCastKind()) {
case CK_BitCast:
case CK_LValueBitCast:
case CK_LValueToRValue:
case CK_ARCReclaimReturnedObject:
e = cast->getSubExpr();
continue;
default:
return false;
}
}
if (ObjCIvarRefExpr *ref = dyn_cast<ObjCIvarRefExpr>(e)) {
ObjCIvarDecl *ivar = ref->getDecl();
if (ivar->getType().getObjCLifetime() != Qualifiers::OCL_Strong)
return false;
// Try to find a retain cycle in the base.
if (!findRetainCycleOwner(S, ref->getBase(), owner))
return false;
if (ref->isFreeIvar())
owner.setLocsFrom(ref);
owner.Indirect = true;
return true;
}
if (DeclRefExpr *ref = dyn_cast<DeclRefExpr>(e)) {
VarDecl *var = dyn_cast<VarDecl>(ref->getDecl());
if (!var)
return false;
return considerVariable(var, ref, owner);
}
if (MemberExpr *member = dyn_cast<MemberExpr>(e)) {
if (member->isArrow())
return false;
// Don't count this as an indirect ownership.
e = member->getBase();
continue;
}
if (PseudoObjectExpr *pseudo = dyn_cast<PseudoObjectExpr>(e)) {
// Only pay attention to pseudo-objects on property references.
ObjCPropertyRefExpr *pre = dyn_cast<ObjCPropertyRefExpr>(
pseudo->getSyntacticForm()->IgnoreParens());
if (!pre)
return false;
if (pre->isImplicitProperty())
return false;
ObjCPropertyDecl *property = pre->getExplicitProperty();
if (!property->isRetaining() &&
!(property->getPropertyIvarDecl() &&
property->getPropertyIvarDecl()->getType().getObjCLifetime() ==
Qualifiers::OCL_Strong))
return false;
owner.Indirect = true;
if (pre->isSuperReceiver()) {
owner.Variable = S.getCurMethodDecl()->getSelfDecl();
if (!owner.Variable)
return false;
owner.Loc = pre->getLocation();
owner.Range = pre->getSourceRange();
return true;
}
e = const_cast<Expr *>(
cast<OpaqueValueExpr>(pre->getBase())->getSourceExpr());
continue;
}
// Array ivars?
return false;
}
}
namespace {
struct FindCaptureVisitor : EvaluatedExprVisitor<FindCaptureVisitor> {
VarDecl *Variable;
Expr *Capturer = nullptr;
bool VarWillBeReased = false;
FindCaptureVisitor(ASTContext &Context, VarDecl *variable)
: EvaluatedExprVisitor<FindCaptureVisitor>(Context), Variable(variable) {}
void VisitDeclRefExpr(DeclRefExpr *ref) {
if (ref->getDecl() == Variable && !Capturer)
Capturer = ref;
}
void VisitObjCIvarRefExpr(ObjCIvarRefExpr *ref) {
if (Capturer)
return;
Visit(ref->getBase());
if (Capturer && ref->isFreeIvar())
Capturer = ref;
}
void VisitBlockExpr(BlockExpr *block) {
// Look inside nested blocks
if (block->getBlockDecl()->capturesVariable(Variable))
Visit(block->getBlockDecl()->getBody());
}
void VisitOpaqueValueExpr(OpaqueValueExpr *OVE) {
if (Capturer)
return;
if (OVE->getSourceExpr())
Visit(OVE->getSourceExpr());
}
void VisitBinaryOperator(BinaryOperator *BinOp) {
if (!Variable || VarWillBeReased || BinOp->getOpcode() != BO_Assign)
return;
Expr *LHS = BinOp->getLHS();
if (const DeclRefExpr *DRE = dyn_cast_or_null<DeclRefExpr>(LHS)) {
if (DRE->getDecl() != Variable)
return;
if (Expr *RHS = BinOp->getRHS()) {
RHS = RHS->IgnoreParenCasts();
std::optional<llvm::APSInt> Value;
VarWillBeReased =
(RHS && (Value = RHS->getIntegerConstantExpr(Context)) &&
*Value == 0);
}
}
}
};
} // namespace
/// Check whether the given argument is a block which captures a
/// variable.
static Expr *findCapturingExpr(Sema &S, Expr *e, RetainCycleOwner &owner) {
assert(owner.Variable && owner.Loc.isValid());
e = e->IgnoreParenCasts();
// Look through [^{...} copy] and Block_copy(^{...}).
if (ObjCMessageExpr *ME = dyn_cast<ObjCMessageExpr>(e)) {
Selector Cmd = ME->getSelector();
if (Cmd.isUnarySelector() && Cmd.getNameForSlot(0) == "copy") {
e = ME->getInstanceReceiver();
if (!e)
return nullptr;
e = e->IgnoreParenCasts();
}
} else if (CallExpr *CE = dyn_cast<CallExpr>(e)) {
if (CE->getNumArgs() == 1) {
FunctionDecl *Fn = dyn_cast_or_null<FunctionDecl>(CE->getCalleeDecl());
if (Fn) {
const IdentifierInfo *FnI = Fn->getIdentifier();
if (FnI && FnI->isStr("_Block_copy")) {
e = CE->getArg(0)->IgnoreParenCasts();
}
}
}
}
BlockExpr *block = dyn_cast<BlockExpr>(e);
if (!block || !block->getBlockDecl()->capturesVariable(owner.Variable))
return nullptr;
FindCaptureVisitor visitor(S.Context, owner.Variable);
visitor.Visit(block->getBlockDecl()->getBody());
return visitor.VarWillBeReased ? nullptr : visitor.Capturer;
}
static void diagnoseRetainCycle(Sema &S, Expr *capturer,
RetainCycleOwner &owner) {
assert(capturer);
assert(owner.Variable && owner.Loc.isValid());
S.Diag(capturer->getExprLoc(), diag::warn_arc_retain_cycle)
<< owner.Variable << capturer->getSourceRange();
S.Diag(owner.Loc, diag::note_arc_retain_cycle_owner)
<< owner.Indirect << owner.Range;
}
/// Check for a keyword selector that starts with the word 'add' or
/// 'set'.
static bool isSetterLikeSelector(Selector sel) {
if (sel.isUnarySelector())
return false;
StringRef str = sel.getNameForSlot(0);
str = str.ltrim('_');
if (str.starts_with("set"))
str = str.substr(3);
else if (str.starts_with("add")) {
// Specially allow 'addOperationWithBlock:'.
if (sel.getNumArgs() == 1 && str.starts_with("addOperationWithBlock"))
return false;
str = str.substr(3);
} else
return false;
if (str.empty())
return true;
return !isLowercase(str.front());
}
static std::optional<int>
GetNSMutableArrayArgumentIndex(SemaObjC &S, ObjCMessageExpr *Message) {
bool IsMutableArray = S.NSAPIObj->isSubclassOfNSClass(
Message->getReceiverInterface(), NSAPI::ClassId_NSMutableArray);
if (!IsMutableArray) {
return std::nullopt;
}
Selector Sel = Message->getSelector();
std::optional<NSAPI::NSArrayMethodKind> MKOpt =
S.NSAPIObj->getNSArrayMethodKind(Sel);
if (!MKOpt) {
return std::nullopt;
}
NSAPI::NSArrayMethodKind MK = *MKOpt;
switch (MK) {
case NSAPI::NSMutableArr_addObject:
case NSAPI::NSMutableArr_insertObjectAtIndex:
case NSAPI::NSMutableArr_setObjectAtIndexedSubscript:
return 0;
case NSAPI::NSMutableArr_replaceObjectAtIndex:
return 1;
default:
return std::nullopt;
}
return std::nullopt;
}
static std::optional<int>
GetNSMutableDictionaryArgumentIndex(SemaObjC &S, ObjCMessageExpr *Message) {
bool IsMutableDictionary = S.NSAPIObj->isSubclassOfNSClass(
Message->getReceiverInterface(), NSAPI::ClassId_NSMutableDictionary);
if (!IsMutableDictionary) {
return std::nullopt;
}
Selector Sel = Message->getSelector();
std::optional<NSAPI::NSDictionaryMethodKind> MKOpt =
S.NSAPIObj->getNSDictionaryMethodKind(Sel);
if (!MKOpt) {
return std::nullopt;
}
NSAPI::NSDictionaryMethodKind MK = *MKOpt;
switch (MK) {
case NSAPI::NSMutableDict_setObjectForKey:
case NSAPI::NSMutableDict_setValueForKey:
case NSAPI::NSMutableDict_setObjectForKeyedSubscript:
return 0;
default:
return std::nullopt;
}
return std::nullopt;
}
static std::optional<int> GetNSSetArgumentIndex(SemaObjC &S,
ObjCMessageExpr *Message) {
bool IsMutableSet = S.NSAPIObj->isSubclassOfNSClass(
Message->getReceiverInterface(), NSAPI::ClassId_NSMutableSet);
bool IsMutableOrderedSet = S.NSAPIObj->isSubclassOfNSClass(
Message->getReceiverInterface(), NSAPI::ClassId_NSMutableOrderedSet);
if (!IsMutableSet && !IsMutableOrderedSet) {
return std::nullopt;
}
Selector Sel = Message->getSelector();
std::optional<NSAPI::NSSetMethodKind> MKOpt =
S.NSAPIObj->getNSSetMethodKind(Sel);
if (!MKOpt) {
return std::nullopt;
}
NSAPI::NSSetMethodKind MK = *MKOpt;
switch (MK) {
case NSAPI::NSMutableSet_addObject:
case NSAPI::NSOrderedSet_setObjectAtIndex:
case NSAPI::NSOrderedSet_setObjectAtIndexedSubscript:
case NSAPI::NSOrderedSet_insertObjectAtIndex:
return 0;
case NSAPI::NSOrderedSet_replaceObjectAtIndexWithObject:
return 1;
}
return std::nullopt;
}
void SemaObjC::CheckObjCCircularContainer(ObjCMessageExpr *Message) {
if (!Message->isInstanceMessage()) {
return;
}
std::optional<int> ArgOpt;
if (!(ArgOpt = GetNSMutableArrayArgumentIndex(*this, Message)) &&
!(ArgOpt = GetNSMutableDictionaryArgumentIndex(*this, Message)) &&
!(ArgOpt = GetNSSetArgumentIndex(*this, Message))) {
return;
}
int ArgIndex = *ArgOpt;
Expr *Arg = Message->getArg(ArgIndex)->IgnoreImpCasts();
if (OpaqueValueExpr *OE = dyn_cast<OpaqueValueExpr>(Arg)) {
Arg = OE->getSourceExpr()->IgnoreImpCasts();
}
if (Message->getReceiverKind() == ObjCMessageExpr::SuperInstance) {
if (DeclRefExpr *ArgRE = dyn_cast<DeclRefExpr>(Arg)) {
if (ArgRE->isObjCSelfExpr()) {
Diag(Message->getSourceRange().getBegin(),
diag::warn_objc_circular_container)
<< ArgRE->getDecl() << StringRef("'super'");
}
}
} else {
Expr *Receiver = Message->getInstanceReceiver()->IgnoreImpCasts();
if (OpaqueValueExpr *OE = dyn_cast<OpaqueValueExpr>(Receiver)) {
Receiver = OE->getSourceExpr()->IgnoreImpCasts();
}
if (DeclRefExpr *ReceiverRE = dyn_cast<DeclRefExpr>(Receiver)) {
if (DeclRefExpr *ArgRE = dyn_cast<DeclRefExpr>(Arg)) {
if (ReceiverRE->getDecl() == ArgRE->getDecl()) {
ValueDecl *Decl = ReceiverRE->getDecl();
Diag(Message->getSourceRange().getBegin(),
diag::warn_objc_circular_container)
<< Decl << Decl;
if (!ArgRE->isObjCSelfExpr()) {
Diag(Decl->getLocation(),
diag::note_objc_circular_container_declared_here)
<< Decl;
}
}
}
} else if (ObjCIvarRefExpr *IvarRE = dyn_cast<ObjCIvarRefExpr>(Receiver)) {
if (ObjCIvarRefExpr *IvarArgRE = dyn_cast<ObjCIvarRefExpr>(Arg)) {
if (IvarRE->getDecl() == IvarArgRE->getDecl()) {
ObjCIvarDecl *Decl = IvarRE->getDecl();
Diag(Message->getSourceRange().getBegin(),
diag::warn_objc_circular_container)
<< Decl << Decl;
Diag(Decl->getLocation(),
diag::note_objc_circular_container_declared_here)
<< Decl;
}
}
}
}
}
/// Check a message send to see if it's likely to cause a retain cycle.
void SemaObjC::checkRetainCycles(ObjCMessageExpr *msg) {
// Only check instance methods whose selector looks like a setter.
if (!msg->isInstanceMessage() || !isSetterLikeSelector(msg->getSelector()))
return;
// Try to find a variable that the receiver is strongly owned by.
RetainCycleOwner owner;
if (msg->getReceiverKind() == ObjCMessageExpr::Instance) {
if (!findRetainCycleOwner(SemaRef, msg->getInstanceReceiver(), owner))
return;
} else {
assert(msg->getReceiverKind() == ObjCMessageExpr::SuperInstance);
owner.Variable = SemaRef.getCurMethodDecl()->getSelfDecl();
owner.Loc = msg->getSuperLoc();
owner.Range = msg->getSuperLoc();
}
// Check whether the receiver is captured by any of the arguments.
const ObjCMethodDecl *MD = msg->getMethodDecl();
for (unsigned i = 0, e = msg->getNumArgs(); i != e; ++i) {
if (Expr *capturer = findCapturingExpr(SemaRef, msg->getArg(i), owner)) {
// noescape blocks should not be retained by the method.
if (MD && MD->parameters()[i]->hasAttr<NoEscapeAttr>())
continue;
return diagnoseRetainCycle(SemaRef, capturer, owner);
}
}
}
/// Check a property assign to see if it's likely to cause a retain cycle.
void SemaObjC::checkRetainCycles(Expr *receiver, Expr *argument) {
RetainCycleOwner owner;
if (!findRetainCycleOwner(SemaRef, receiver, owner))
return;
if (Expr *capturer = findCapturingExpr(SemaRef, argument, owner))
diagnoseRetainCycle(SemaRef, capturer, owner);
}
void SemaObjC::checkRetainCycles(VarDecl *Var, Expr *Init) {
RetainCycleOwner Owner;
if (!considerVariable(Var, /*DeclRefExpr=*/nullptr, Owner))
return;
// Because we don't have an expression for the variable, we have to set the
// location explicitly here.
Owner.Loc = Var->getLocation();
Owner.Range = Var->getSourceRange();
if (Expr *Capturer = findCapturingExpr(SemaRef, Init, Owner))
diagnoseRetainCycle(SemaRef, Capturer, Owner);
}
/// CheckObjCString - Checks that the argument to the builtin
/// CFString constructor is correct
/// Note: It might also make sense to do the UTF-16 conversion here (would
/// simplify the backend).
bool SemaObjC::CheckObjCString(Expr *Arg) {
Arg = Arg->IgnoreParenCasts();
StringLiteral *Literal = dyn_cast<StringLiteral>(Arg);
if (!Literal || !Literal->isOrdinary()) {
Diag(Arg->getBeginLoc(), diag::err_cfstring_literal_not_string_constant)
<< Arg->getSourceRange();
return true;
}
if (Literal->containsNonAsciiOrNull()) {
StringRef String = Literal->getString();
unsigned NumBytes = String.size();
SmallVector<llvm::UTF16, 128> ToBuf(NumBytes);
const llvm::UTF8 *FromPtr = (const llvm::UTF8 *)String.data();
llvm::UTF16 *ToPtr = &ToBuf[0];
llvm::ConversionResult Result =
llvm::ConvertUTF8toUTF16(&FromPtr, FromPtr + NumBytes, &ToPtr,
ToPtr + NumBytes, llvm::strictConversion);
// Check for conversion failure.
if (Result != llvm::conversionOK)
Diag(Arg->getBeginLoc(), diag::warn_cfstring_truncated)
<< Arg->getSourceRange();
}
return false;
}
bool SemaObjC::CheckObjCMethodCall(ObjCMethodDecl *Method, SourceLocation lbrac,
ArrayRef<const Expr *> Args) {
Sema::VariadicCallType CallType =
Method->isVariadic() ? Sema::VariadicMethod : Sema::VariadicDoesNotApply;
SemaRef.checkCall(Method, nullptr, /*ThisArg=*/nullptr, Args,
/*IsMemberFunction=*/false, lbrac, Method->getSourceRange(),
CallType);
SemaRef.CheckTCBEnforcement(lbrac, Method);
return false;
}
const DeclContext *SemaObjC::getCurObjCLexicalContext() const {
const DeclContext *DC = SemaRef.getCurLexicalContext();
// A category implicitly has the attribute of the interface.
if (const ObjCCategoryDecl *CatD = dyn_cast<ObjCCategoryDecl>(DC))
DC = CatD->getClassInterface();
return DC;
}
/// Retrieve the identifier "NSError".
IdentifierInfo *SemaObjC::getNSErrorIdent() {
if (!Ident_NSError)
Ident_NSError = SemaRef.PP.getIdentifierInfo("NSError");
return Ident_NSError;
}
void SemaObjC::ActOnObjCContainerStartDefinition(ObjCContainerDecl *IDecl) {
assert(
IDecl->getLexicalParent() == SemaRef.CurContext &&
"The next DeclContext should be lexically contained in the current one.");
SemaRef.CurContext = IDecl;
}
void SemaObjC::ActOnObjCContainerFinishDefinition() {
// Exit this scope of this interface definition.
SemaRef.PopDeclContext();
}
void SemaObjC::ActOnObjCTemporaryExitContainerContext(
ObjCContainerDecl *ObjCCtx) {
assert(ObjCCtx == SemaRef.CurContext && "Mismatch of container contexts");
SemaRef.OriginalLexicalContext = ObjCCtx;
ActOnObjCContainerFinishDefinition();
}
void SemaObjC::ActOnObjCReenterContainerContext(ObjCContainerDecl *ObjCCtx) {
ActOnObjCContainerStartDefinition(ObjCCtx);
SemaRef.OriginalLexicalContext = nullptr;
}
/// Find the protocol with the given name, if any.
ObjCProtocolDecl *SemaObjC::LookupProtocol(IdentifierInfo *II,
SourceLocation IdLoc,
RedeclarationKind Redecl) {
Decl *D = SemaRef.LookupSingleName(SemaRef.TUScope, II, IdLoc,
Sema::LookupObjCProtocolName, Redecl);
return cast_or_null<ObjCProtocolDecl>(D);
}
/// Determine whether this is an Objective-C writeback conversion,
/// used for parameter passing when performing automatic reference counting.
///
/// \param FromType The type we're converting form.
///
/// \param ToType The type we're converting to.
///
/// \param ConvertedType The type that will be produced after applying
/// this conversion.
bool SemaObjC::isObjCWritebackConversion(QualType FromType, QualType ToType,
QualType &ConvertedType) {
ASTContext &Context = getASTContext();
if (!getLangOpts().ObjCAutoRefCount ||
Context.hasSameUnqualifiedType(FromType, ToType))
return false;
// Parameter must be a pointer to __autoreleasing (with no other qualifiers).
QualType ToPointee;
if (const PointerType *ToPointer = ToType->getAs<PointerType>())
ToPointee = ToPointer->getPointeeType();
else
return false;
Qualifiers ToQuals = ToPointee.getQualifiers();
if (!ToPointee->isObjCLifetimeType() ||
ToQuals.getObjCLifetime() != Qualifiers::OCL_Autoreleasing ||
!ToQuals.withoutObjCLifetime().empty())
return false;
// Argument must be a pointer to __strong to __weak.
QualType FromPointee;
if (const PointerType *FromPointer = FromType->getAs<PointerType>())
FromPointee = FromPointer->getPointeeType();
else
return false;
Qualifiers FromQuals = FromPointee.getQualifiers();
if (!FromPointee->isObjCLifetimeType() ||
(FromQuals.getObjCLifetime() != Qualifiers::OCL_Strong &&
FromQuals.getObjCLifetime() != Qualifiers::OCL_Weak))
return false;
// Make sure that we have compatible qualifiers.
FromQuals.setObjCLifetime(Qualifiers::OCL_Autoreleasing);
if (!ToQuals.compatiblyIncludes(FromQuals))
return false;
// Remove qualifiers from the pointee type we're converting from; they
// aren't used in the compatibility check belong, and we'll be adding back
// qualifiers (with __autoreleasing) if the compatibility check succeeds.
FromPointee = FromPointee.getUnqualifiedType();
// The unqualified form of the pointee types must be compatible.
ToPointee = ToPointee.getUnqualifiedType();
bool IncompatibleObjC;
if (Context.typesAreCompatible(FromPointee, ToPointee))
FromPointee = ToPointee;
else if (!SemaRef.isObjCPointerConversion(FromPointee, ToPointee, FromPointee,
IncompatibleObjC))
return false;
/// Construct the type we're converting to, which is a pointer to
/// __autoreleasing pointee.
FromPointee = Context.getQualifiedType(FromPointee, FromQuals);
ConvertedType = Context.getPointerType(FromPointee);
return true;
}
/// CheckSubscriptingKind - This routine decide what type
/// of indexing represented by "FromE" is being done.
SemaObjC::ObjCSubscriptKind SemaObjC::CheckSubscriptingKind(Expr *FromE) {
// If the expression already has integral or enumeration type, we're golden.
QualType T = FromE->getType();
if (T->isIntegralOrEnumerationType())
return SemaObjC::OS_Array;
// If we don't have a class type in C++, there's no way we can get an
// expression of integral or enumeration type.
const RecordType *RecordTy = T->getAs<RecordType>();
if (!RecordTy && (T->isObjCObjectPointerType() || T->isVoidPointerType()))
// All other scalar cases are assumed to be dictionary indexing which
// caller handles, with diagnostics if needed.
return SemaObjC::OS_Dictionary;
if (!getLangOpts().CPlusPlus || !RecordTy || RecordTy->isIncompleteType()) {
// No indexing can be done. Issue diagnostics and quit.
const Expr *IndexExpr = FromE->IgnoreParenImpCasts();
if (isa<StringLiteral>(IndexExpr))
Diag(FromE->getExprLoc(), diag::err_objc_subscript_pointer)
<< T << FixItHint::CreateInsertion(FromE->getExprLoc(), "@");
else
Diag(FromE->getExprLoc(), diag::err_objc_subscript_type_conversion) << T;
return SemaObjC::OS_Error;
}
// We must have a complete class type.
if (SemaRef.RequireCompleteType(FromE->getExprLoc(), T,
diag::err_objc_index_incomplete_class_type,
FromE))
return SemaObjC::OS_Error;
// Look for a conversion to an integral, enumeration type, or
// objective-C pointer type.
int NoIntegrals = 0, NoObjCIdPointers = 0;
SmallVector<CXXConversionDecl *, 4> ConversionDecls;
for (NamedDecl *D : cast<CXXRecordDecl>(RecordTy->getDecl())
->getVisibleConversionFunctions()) {
if (CXXConversionDecl *Conversion =
dyn_cast<CXXConversionDecl>(D->getUnderlyingDecl())) {
QualType CT = Conversion->getConversionType().getNonReferenceType();
if (CT->isIntegralOrEnumerationType()) {
++NoIntegrals;
ConversionDecls.push_back(Conversion);
} else if (CT->isObjCIdType() || CT->isBlockPointerType()) {
++NoObjCIdPointers;
ConversionDecls.push_back(Conversion);
}
}
}
if (NoIntegrals == 1 && NoObjCIdPointers == 0)
return SemaObjC::OS_Array;
if (NoIntegrals == 0 && NoObjCIdPointers == 1)
return SemaObjC::OS_Dictionary;
if (NoIntegrals == 0 && NoObjCIdPointers == 0) {
// No conversion function was found. Issue diagnostic and return.
Diag(FromE->getExprLoc(), diag::err_objc_subscript_type_conversion)
<< FromE->getType();
return SemaObjC::OS_Error;
}
Diag(FromE->getExprLoc(), diag::err_objc_multiple_subscript_type_conversion)
<< FromE->getType();
for (unsigned int i = 0; i < ConversionDecls.size(); i++)
Diag(ConversionDecls[i]->getLocation(),
diag::note_conv_function_declared_at);
return SemaObjC::OS_Error;
}
void SemaObjC::AddCFAuditedAttribute(Decl *D) {
ASTContext &Context = getASTContext();
IdentifierInfo *Ident;
SourceLocation Loc;
std::tie(Ident, Loc) = SemaRef.PP.getPragmaARCCFCodeAuditedInfo();
if (!Loc.isValid())
return;
// Don't add a redundant or conflicting attribute.
if (D->hasAttr<CFAuditedTransferAttr>() ||
D->hasAttr<CFUnknownTransferAttr>())
return;
AttributeCommonInfo Info(Ident, SourceRange(Loc),
AttributeCommonInfo::Form::Pragma());
D->addAttr(CFAuditedTransferAttr::CreateImplicit(Context, Info));
}
bool SemaObjC::isCFError(RecordDecl *RD) {
// If we already know about CFError, test it directly.
if (CFError)
return CFError == RD;
// Check whether this is CFError, which we identify based on its bridge to
// NSError. CFErrorRef used to be declared with "objc_bridge" but is now
// declared with "objc_bridge_mutable", so look for either one of the two
// attributes.
if (RD->getTagKind() == TagTypeKind::Struct) {
IdentifierInfo *bridgedType = nullptr;
if (auto bridgeAttr = RD->getAttr<ObjCBridgeAttr>())
bridgedType = bridgeAttr->getBridgedType();
else if (auto bridgeAttr = RD->getAttr<ObjCBridgeMutableAttr>())
bridgedType = bridgeAttr->getBridgedType();
if (bridgedType == getNSErrorIdent()) {
CFError = RD;
return true;
}
}
return false;
}
} // namespace clang
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