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-rw-r--r--clang/lib/CodeGen/CGExpr.cpp465
1 files changed, 199 insertions, 266 deletions
diff --git a/clang/lib/CodeGen/CGExpr.cpp b/clang/lib/CodeGen/CGExpr.cpp
index 501d7ecfa37..d534ff440cf 100644
--- a/clang/lib/CodeGen/CGExpr.cpp
+++ b/clang/lib/CodeGen/CGExpr.cpp
@@ -171,128 +171,187 @@ void CodeGenFunction::EmitAnyExprToMem(const Expr *E,
llvm_unreachable("bad evaluation kind");
}
-static llvm::Value *
-CreateReferenceTemporary(CodeGenFunction &CGF, QualType Type,
- const NamedDecl *InitializedDecl) {
- if (const VarDecl *VD = dyn_cast_or_null<VarDecl>(InitializedDecl)) {
- if (VD->hasGlobalStorage()) {
- SmallString<256> Name;
- llvm::raw_svector_ostream Out(Name);
- CGF.CGM.getCXXABI().getMangleContext().mangleReferenceTemporary(VD, Out);
- Out.flush();
-
- llvm::Type *RefTempTy = CGF.ConvertTypeForMem(Type);
-
- // Create the reference temporary.
- llvm::GlobalVariable *RefTemp =
- new llvm::GlobalVariable(CGF.CGM.getModule(),
- RefTempTy, /*isConstant=*/false,
- llvm::GlobalValue::InternalLinkage,
- llvm::Constant::getNullValue(RefTempTy),
- Name.str());
- // If we're binding to a thread_local variable, the temporary is also
- // thread local.
- if (VD->getTLSKind())
- CGF.CGM.setTLSMode(RefTemp, *VD);
- return RefTemp;
+static void
+pushTemporaryCleanup(CodeGenFunction &CGF, const MaterializeTemporaryExpr *M,
+ const Expr *E, llvm::Value *ReferenceTemporary) {
+ // Objective-C++ ARC:
+ // If we are binding a reference to a temporary that has ownership, we
+ // need to perform retain/release operations on the temporary.
+ //
+ // FIXME: This should be looking at E, not M.
+ if (CGF.getLangOpts().ObjCAutoRefCount &&
+ M->getType()->isObjCLifetimeType()) {
+ QualType ObjCARCReferenceLifetimeType = M->getType();
+ switch (Qualifiers::ObjCLifetime Lifetime =
+ ObjCARCReferenceLifetimeType.getObjCLifetime()) {
+ case Qualifiers::OCL_None:
+ case Qualifiers::OCL_ExplicitNone:
+ // Carry on to normal cleanup handling.
+ break;
+
+ case Qualifiers::OCL_Autoreleasing:
+ // Nothing to do; cleaned up by an autorelease pool.
+ return;
+
+ case Qualifiers::OCL_Strong:
+ case Qualifiers::OCL_Weak:
+ switch (StorageDuration Duration = M->getStorageDuration()) {
+ case SD_Static:
+ // Note: we intentionally do not register a cleanup to release
+ // the object on program termination.
+ return;
+
+ case SD_Thread:
+ // FIXME: We should probably register a cleanup in this case.
+ return;
+
+ case SD_Automatic:
+ case SD_FullExpression:
+ assert(!ObjCARCReferenceLifetimeType->isArrayType());
+ CodeGenFunction::Destroyer *Destroy;
+ CleanupKind CleanupKind;
+ if (Lifetime == Qualifiers::OCL_Strong) {
+ const ValueDecl *VD = M->getExtendingDecl();
+ bool Precise =
+ VD && isa<VarDecl>(VD) && VD->hasAttr<ObjCPreciseLifetimeAttr>();
+ CleanupKind = CGF.getARCCleanupKind();
+ Destroy = Precise ? &CodeGenFunction::destroyARCStrongPrecise
+ : &CodeGenFunction::destroyARCStrongImprecise;
+ } else {
+ // __weak objects always get EH cleanups; otherwise, exceptions
+ // could cause really nasty crashes instead of mere leaks.
+ CleanupKind = NormalAndEHCleanup;
+ Destroy = &CodeGenFunction::destroyARCWeak;
+ }
+ if (Duration == SD_FullExpression)
+ CGF.pushDestroy(CleanupKind, ReferenceTemporary,
+ ObjCARCReferenceLifetimeType, *Destroy,
+ CleanupKind & EHCleanup);
+ else
+ CGF.pushLifetimeExtendedDestroy(CleanupKind, ReferenceTemporary,
+ ObjCARCReferenceLifetimeType,
+ *Destroy, CleanupKind & EHCleanup);
+ return;
+
+ case SD_Dynamic:
+ llvm_unreachable("temporary cannot have dynamic storage duration");
+ }
+ llvm_unreachable("unknown storage duration");
+ }
+ }
+
+ if (const InitListExpr *ILE = dyn_cast<InitListExpr>(E)) {
+ if (ILE->initializesStdInitializerList()) {
+ // FIXME: This is wrong if the temporary has static or thread storage
+ // duration.
+ CGF.EmitStdInitializerListCleanup(ReferenceTemporary, ILE);
+ return;
}
}
- return CGF.CreateMemTemp(Type, "ref.tmp");
+ CXXDestructorDecl *ReferenceTemporaryDtor = 0;
+ if (const RecordType *RT =
+ E->getType()->getBaseElementTypeUnsafe()->getAs<RecordType>()) {
+ // Get the destructor for the reference temporary.
+ CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RT->getDecl());
+ if (!ClassDecl->hasTrivialDestructor())
+ ReferenceTemporaryDtor = ClassDecl->getDestructor();
+ }
+
+ if (!ReferenceTemporaryDtor)
+ return;
+
+ // Call the destructor for the temporary.
+ switch (M->getStorageDuration()) {
+ case SD_Static:
+ case SD_Thread: {
+ llvm::Constant *CleanupFn;
+ llvm::Constant *CleanupArg;
+ if (E->getType()->isArrayType()) {
+ CleanupFn = CodeGenFunction(CGF.CGM).generateDestroyHelper(
+ cast<llvm::Constant>(ReferenceTemporary), E->getType(),
+ CodeGenFunction::destroyCXXObject, CGF.getLangOpts().Exceptions);
+ CleanupArg = llvm::Constant::getNullValue(CGF.Int8PtrTy);
+ } else {
+ CleanupFn =
+ CGF.CGM.GetAddrOfCXXDestructor(ReferenceTemporaryDtor, Dtor_Complete);
+ CleanupArg = cast<llvm::Constant>(ReferenceTemporary);
+ }
+ CGF.CGM.getCXXABI().registerGlobalDtor(
+ CGF, *cast<VarDecl>(M->getExtendingDecl()), CleanupFn, CleanupArg);
+ break;
+ }
+
+ case SD_FullExpression:
+ CGF.pushDestroy(NormalAndEHCleanup, ReferenceTemporary, E->getType(),
+ CodeGenFunction::destroyCXXObject,
+ CGF.getLangOpts().Exceptions);
+ break;
+
+ case SD_Automatic:
+ CGF.pushLifetimeExtendedDestroy(NormalAndEHCleanup,
+ ReferenceTemporary, E->getType(),
+ CodeGenFunction::destroyCXXObject,
+ CGF.getLangOpts().Exceptions);
+ break;
+
+ case SD_Dynamic:
+ llvm_unreachable("temporary cannot have dynamic storage duration");
+ }
}
static llvm::Value *
-EmitExprForReferenceBinding(CodeGenFunction &CGF, const Expr *E,
- llvm::Value *&ReferenceTemporary,
- const CXXDestructorDecl *&ReferenceTemporaryDtor,
- const InitListExpr *&ReferenceInitializerList,
- QualType &ObjCARCReferenceLifetimeType,
- const NamedDecl *InitializedDecl) {
- const MaterializeTemporaryExpr *M = NULL;
- E = E->findMaterializedTemporary(M);
- // Objective-C++ ARC:
- // If we are binding a reference to a temporary that has ownership, we
- // need to perform retain/release operations on the temporary.
- if (M && CGF.getLangOpts().ObjCAutoRefCount &&
- M->getType()->isObjCLifetimeType() &&
- (M->getType().getObjCLifetime() == Qualifiers::OCL_Strong ||
- M->getType().getObjCLifetime() == Qualifiers::OCL_Weak ||
- M->getType().getObjCLifetime() == Qualifiers::OCL_Autoreleasing))
- ObjCARCReferenceLifetimeType = M->getType();
+createReferenceTemporary(CodeGenFunction &CGF,
+ const MaterializeTemporaryExpr *M, const Expr *Inner) {
+ switch (M->getStorageDuration()) {
+ case SD_FullExpression:
+ case SD_Automatic:
+ return CGF.CreateMemTemp(Inner->getType(), "ref.tmp");
+ case SD_Thread:
+ case SD_Static:
+ return CGF.CGM.GetAddrOfGlobalTemporary(M, Inner);
+
+ case SD_Dynamic:
+ llvm_unreachable("temporary can't have dynamic storage duration");
+ }
+ llvm_unreachable("unknown storage duration");
+}
+
+static llvm::Value *
+emitExprForReferenceBinding(CodeGenFunction &CGF, const Expr *E,
+ const NamedDecl *InitializedDecl) {
if (const ExprWithCleanups *EWC = dyn_cast<ExprWithCleanups>(E)) {
CGF.enterFullExpression(EWC);
CodeGenFunction::RunCleanupsScope Scope(CGF);
-
- return EmitExprForReferenceBinding(CGF, EWC->getSubExpr(),
- ReferenceTemporary,
- ReferenceTemporaryDtor,
- ReferenceInitializerList,
- ObjCARCReferenceLifetimeType,
- InitializedDecl);
+ return emitExprForReferenceBinding(CGF, EWC->getSubExpr(), InitializedDecl);
}
+ const MaterializeTemporaryExpr *M = 0;
+ E = E->findMaterializedTemporary(M);
+
if (E->isGLValue()) {
// Emit the expression as an lvalue.
LValue LV = CGF.EmitLValue(E);
assert(LV.isSimple());
return LV.getAddress();
}
-
- if (!ObjCARCReferenceLifetimeType.isNull()) {
- ReferenceTemporary = CreateReferenceTemporary(CGF,
- ObjCARCReferenceLifetimeType,
- InitializedDecl);
-
-
- LValue RefTempDst = CGF.MakeAddrLValue(ReferenceTemporary,
- ObjCARCReferenceLifetimeType);
+
+ assert(M && "prvalue reference initializer but not a materialized temporary");
+
+ if (CGF.getLangOpts().ObjCAutoRefCount &&
+ M->getType()->isObjCLifetimeType() &&
+ M->getType().getObjCLifetime() != Qualifiers::OCL_None &&
+ M->getType().getObjCLifetime() != Qualifiers::OCL_ExplicitNone) {
+ // FIXME: Fold this into the general case below.
+ llvm::Value *Object = createReferenceTemporary(CGF, M, E);
+ LValue RefTempDst = CGF.MakeAddrLValue(Object, M->getType());
CGF.EmitScalarInit(E, dyn_cast_or_null<ValueDecl>(InitializedDecl),
RefTempDst, false);
-
- bool ExtendsLifeOfTemporary = false;
- if (const VarDecl *Var = dyn_cast_or_null<VarDecl>(InitializedDecl)) {
- if (Var->extendsLifetimeOfTemporary())
- ExtendsLifeOfTemporary = true;
- } else if (InitializedDecl && isa<FieldDecl>(InitializedDecl)) {
- ExtendsLifeOfTemporary = true;
- }
-
- if (!ExtendsLifeOfTemporary) {
- // Since the lifetime of this temporary isn't going to be extended,
- // we need to clean it up ourselves at the end of the full expression.
- switch (ObjCARCReferenceLifetimeType.getObjCLifetime()) {
- case Qualifiers::OCL_None:
- case Qualifiers::OCL_ExplicitNone:
- case Qualifiers::OCL_Autoreleasing:
- break;
-
- case Qualifiers::OCL_Strong: {
- assert(!ObjCARCReferenceLifetimeType->isArrayType());
- CleanupKind cleanupKind = CGF.getARCCleanupKind();
- CGF.pushDestroy(cleanupKind,
- ReferenceTemporary,
- ObjCARCReferenceLifetimeType,
- CodeGenFunction::destroyARCStrongImprecise,
- cleanupKind & EHCleanup);
- break;
- }
-
- case Qualifiers::OCL_Weak:
- assert(!ObjCARCReferenceLifetimeType->isArrayType());
- CGF.pushDestroy(NormalAndEHCleanup,
- ReferenceTemporary,
- ObjCARCReferenceLifetimeType,
- CodeGenFunction::destroyARCWeak,
- /*useEHCleanupForArray*/ true);
- break;
- }
-
- ObjCARCReferenceLifetimeType = QualType();
- }
-
- return ReferenceTemporary;
+
+ pushTemporaryCleanup(CGF, M, E, Object);
+ return Object;
}
SmallVector<const Expr *, 2> CommaLHSs;
@@ -302,112 +361,59 @@ EmitExprForReferenceBinding(CodeGenFunction &CGF, const Expr *E,
for (unsigned I = 0, N = CommaLHSs.size(); I != N; ++I)
CGF.EmitIgnoredExpr(CommaLHSs[I]);
- if (const OpaqueValueExpr *opaque = dyn_cast<OpaqueValueExpr>(E))
- if (opaque->getType()->isRecordType())
+ if (const OpaqueValueExpr *opaque = dyn_cast<OpaqueValueExpr>(E)) {
+ if (opaque->getType()->isRecordType()) {
+ assert(Adjustments.empty());
return CGF.EmitOpaqueValueLValue(opaque).getAddress();
-
- // Create a reference temporary if necessary.
- AggValueSlot AggSlot = AggValueSlot::ignored();
- if (CGF.hasAggregateEvaluationKind(E->getType())) {
- ReferenceTemporary = CreateReferenceTemporary(CGF, E->getType(),
- InitializedDecl);
- CharUnits Alignment = CGF.getContext().getTypeAlignInChars(E->getType());
- AggValueSlot::IsDestructed_t isDestructed
- = AggValueSlot::IsDestructed_t(InitializedDecl != 0);
- AggSlot = AggValueSlot::forAddr(ReferenceTemporary, Alignment,
- Qualifiers(), isDestructed,
- AggValueSlot::DoesNotNeedGCBarriers,
- AggValueSlot::IsNotAliased);
- }
-
- if (InitializedDecl) {
- if (const InitListExpr *ILE = dyn_cast<InitListExpr>(E)) {
- if (ILE->initializesStdInitializerList()) {
- ReferenceInitializerList = ILE;
- }
- }
- else if (const RecordType *RT =
- E->getType()->getBaseElementTypeUnsafe()->getAs<RecordType>()){
- // Get the destructor for the reference temporary.
- CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RT->getDecl());
- if (!ClassDecl->hasTrivialDestructor())
- ReferenceTemporaryDtor = ClassDecl->getDestructor();
}
}
- RValue RV = CGF.EmitAnyExpr(E, AggSlot);
-
- // FIXME: This is wrong. We need to register the destructor for the temporary
- // now, *before* we perform the adjustments, because in the case of a
- // pointer-to-member adjustment, the adjustment might throw.
-
- // Check if need to perform derived-to-base casts and/or field accesses, to
- // get from the temporary object we created (and, potentially, for which we
- // extended the lifetime) to the subobject we're binding the reference to.
- if (!Adjustments.empty()) {
- llvm::Value *Object = RV.getAggregateAddr();
- for (unsigned I = Adjustments.size(); I != 0; --I) {
- SubobjectAdjustment &Adjustment = Adjustments[I-1];
- switch (Adjustment.Kind) {
- case SubobjectAdjustment::DerivedToBaseAdjustment:
- Object =
- CGF.GetAddressOfBaseClass(Object,
- Adjustment.DerivedToBase.DerivedClass,
- Adjustment.DerivedToBase.BasePath->path_begin(),
- Adjustment.DerivedToBase.BasePath->path_end(),
- /*NullCheckValue=*/false);
- break;
-
- case SubobjectAdjustment::FieldAdjustment: {
- LValue LV = CGF.MakeAddrLValue(Object, E->getType());
- LV = CGF.EmitLValueForField(LV, Adjustment.Field);
- assert(LV.isSimple() &&
- "materialized temporary field is not a simple lvalue");
- Object = LV.getAddress();
- break;
- }
+ // Create and initialize the reference temporary.
+ llvm::Value *Object = createReferenceTemporary(CGF, M, E);
+ CGF.EmitAnyExprToMem(E, Object, Qualifiers(), /*IsInit*/true);
+ pushTemporaryCleanup(CGF, M, E, Object);
+
+ // Perform derived-to-base casts and/or field accesses, to get from the
+ // temporary object we created (and, potentially, for which we extended
+ // the lifetime) to the subobject we're binding the reference to.
+ for (unsigned I = Adjustments.size(); I != 0; --I) {
+ SubobjectAdjustment &Adjustment = Adjustments[I-1];
+ switch (Adjustment.Kind) {
+ case SubobjectAdjustment::DerivedToBaseAdjustment:
+ Object =
+ CGF.GetAddressOfBaseClass(Object,
+ Adjustment.DerivedToBase.DerivedClass,
+ Adjustment.DerivedToBase.BasePath->path_begin(),
+ Adjustment.DerivedToBase.BasePath->path_end(),
+ /*NullCheckValue=*/false);
+ break;
- case SubobjectAdjustment::MemberPointerAdjustment: {
- llvm::Value *Ptr = CGF.EmitScalarExpr(Adjustment.Ptr.RHS);
- Object = CGF.CGM.getCXXABI().EmitMemberDataPointerAddress(
- CGF, Object, Ptr, Adjustment.Ptr.MPT);
- break;
- }
- }
+ case SubobjectAdjustment::FieldAdjustment: {
+ LValue LV = CGF.MakeAddrLValue(Object, E->getType());
+ LV = CGF.EmitLValueForField(LV, Adjustment.Field);
+ assert(LV.isSimple() &&
+ "materialized temporary field is not a simple lvalue");
+ Object = LV.getAddress();
+ break;
}
- return Object;
+ case SubobjectAdjustment::MemberPointerAdjustment: {
+ llvm::Value *Ptr = CGF.EmitScalarExpr(Adjustment.Ptr.RHS);
+ Object = CGF.CGM.getCXXABI().EmitMemberDataPointerAddress(
+ CGF, Object, Ptr, Adjustment.Ptr.MPT);
+ break;
+ }
+ }
}
- if (RV.isAggregate())
- return RV.getAggregateAddr();
-
- // Create a temporary variable that we can bind the reference to.
- ReferenceTemporary = CreateReferenceTemporary(CGF, E->getType(),
- InitializedDecl);
-
-
- LValue tempLV = CGF.MakeNaturalAlignAddrLValue(ReferenceTemporary,
- E->getType());
- if (RV.isScalar())
- CGF.EmitStoreOfScalar(RV.getScalarVal(), tempLV, /*init*/ true);
- else
- CGF.EmitStoreOfComplex(RV.getComplexVal(), tempLV, /*init*/ true);
- return ReferenceTemporary;
+ return Object;
}
RValue
CodeGenFunction::EmitReferenceBindingToExpr(const Expr *E,
const NamedDecl *InitializedDecl) {
- llvm::Value *ReferenceTemporary = 0;
- const CXXDestructorDecl *ReferenceTemporaryDtor = 0;
- const InitListExpr *ReferenceInitializerList = 0;
- QualType ObjCARCReferenceLifetimeType;
- llvm::Value *Value = EmitExprForReferenceBinding(*this, E, ReferenceTemporary,
- ReferenceTemporaryDtor,
- ReferenceInitializerList,
- ObjCARCReferenceLifetimeType,
- InitializedDecl);
+ llvm::Value *Value = emitExprForReferenceBinding(*this, E, InitializedDecl);
+
if (SanitizePerformTypeCheck && !E->getType()->isFunctionType()) {
// C++11 [dcl.ref]p5 (as amended by core issue 453):
// If a glvalue to which a reference is directly bound designates neither
@@ -417,80 +423,7 @@ CodeGenFunction::EmitReferenceBindingToExpr(const Expr *E,
QualType Ty = E->getType();
EmitTypeCheck(TCK_ReferenceBinding, E->getExprLoc(), Value, Ty);
}
- if (!ReferenceTemporaryDtor && !ReferenceInitializerList &&
- ObjCARCReferenceLifetimeType.isNull())
- return RValue::get(Value);
-
- // Make sure to call the destructor for the reference temporary.
- const VarDecl *VD = dyn_cast_or_null<VarDecl>(InitializedDecl);
- if (VD && VD->hasGlobalStorage()) {
- if (ReferenceTemporaryDtor) {
- llvm::Constant *CleanupFn;
- llvm::Constant *CleanupArg;
- if (E->getType()->isArrayType()) {
- CleanupFn = CodeGenFunction(CGM).generateDestroyHelper(
- cast<llvm::Constant>(ReferenceTemporary), E->getType(),
- destroyCXXObject, getLangOpts().Exceptions);
- CleanupArg = llvm::Constant::getNullValue(Int8PtrTy);
- } else {
- CleanupFn =
- CGM.GetAddrOfCXXDestructor(ReferenceTemporaryDtor, Dtor_Complete);
- CleanupArg = cast<llvm::Constant>(ReferenceTemporary);
- }
- CGM.getCXXABI().registerGlobalDtor(*this, *VD, CleanupFn, CleanupArg);
- } else if (ReferenceInitializerList) {
- // FIXME: This is wrong. We need to register a global destructor to clean
- // up the initializer_list object, rather than adding it as a local
- // cleanup.
- EmitStdInitializerListCleanup(ReferenceTemporary,
- ReferenceInitializerList);
- } else {
- assert(!ObjCARCReferenceLifetimeType.isNull() && !VD->getTLSKind());
- // Note: We intentionally do not register a global "destructor" to
- // release the object.
- }
-
- return RValue::get(Value);
- }
- if (ReferenceTemporaryDtor) {
- if (E->getType()->isArrayType())
- pushDestroy(NormalAndEHCleanup, ReferenceTemporary, E->getType(),
- destroyCXXObject, getLangOpts().Exceptions);
- else
- PushDestructorCleanup(ReferenceTemporaryDtor, ReferenceTemporary);
- } else if (ReferenceInitializerList) {
- EmitStdInitializerListCleanup(ReferenceTemporary,
- ReferenceInitializerList);
- } else {
- switch (ObjCARCReferenceLifetimeType.getObjCLifetime()) {
- case Qualifiers::OCL_None:
- llvm_unreachable(
- "Not a reference temporary that needs to be deallocated");
- case Qualifiers::OCL_ExplicitNone:
- case Qualifiers::OCL_Autoreleasing:
- // Nothing to do.
- break;
-
- case Qualifiers::OCL_Strong: {
- bool precise = VD && VD->hasAttr<ObjCPreciseLifetimeAttr>();
- CleanupKind cleanupKind = getARCCleanupKind();
- pushDestroy(cleanupKind, ReferenceTemporary, ObjCARCReferenceLifetimeType,
- precise ? destroyARCStrongPrecise : destroyARCStrongImprecise,
- cleanupKind & EHCleanup);
- break;
- }
-
- case Qualifiers::OCL_Weak: {
- // __weak objects always get EH cleanups; otherwise, exceptions
- // could cause really nasty crashes instead of mere leaks.
- pushDestroy(NormalAndEHCleanup, ReferenceTemporary,
- ObjCARCReferenceLifetimeType, destroyARCWeak, true);
- break;
- }
- }
- }
-
return RValue::get(Value);
}
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