const ASTRecordLayout &
getASTObjCImplementationLayout(const ObjCImplementationDecl *D) const;
- /// \brief Get the key function for the given record decl, or NULL if there
- /// isn't one.
+ /// \brief Get our current best idea for the key function of the
+ /// given record decl, or NULL if there isn't one.
///
/// The key function is, according to the Itanium C++ ABI section 5.2.3:
+ /// ...the first non-pure virtual function that is not inline at the
+ /// point of class definition.
///
- /// ...the first non-pure virtual function that is not inline at the point
- /// of class definition.
- const CXXMethodDecl *getKeyFunction(const CXXRecordDecl *RD);
+ /// Other ABIs use the same idea. However, the ARM C++ ABI ignores
+ /// virtual functions that are defined 'inline', which means that
+ /// the result of this computation can change.
+ const CXXMethodDecl *getCurrentKeyFunction(const CXXRecordDecl *RD);
+
+ /// \brief Observe that the given method cannot be a key function.
+ /// Checks the key-function cache for the method's class and clears it
+ /// if matches the given declaration.
+ ///
+ /// This is used in ABIs where out-of-line definitions marked
+ /// inline are not considered to be key functions.
+ ///
+ /// \param method should be the declaration from the class definition
+ void setNonKeyFunction(const CXXMethodDecl *method);
/// Get the offset of a FieldDecl or IndirectFieldDecl, in bits.
uint64_t getFieldOffset(const ValueDecl *FD) const;
return isItaniumFamily();
}
+ /// \brief Can an out-of-line inline function serve as a key function?
+ ///
+ /// This flag is only useful in ABIs where type data (for example,
+ /// v-tables and type_info objects) are emitted only after processing
+ /// the definition of a special "key" virtual function. (This is safe
+ /// because the ODR requires that every virtual function be defined
+ /// somewhere in a program.) This usually permits such data to be
+ /// emitted in only a single object file, as opposed to redundantly
+ /// in every object file that requires it.
+ ///
+ /// One simple and common definition of "key function" is the first
+ /// virtual function in the class definition which is not defined there.
+ /// This rule works very well when that function has a non-inline
+ /// definition in some non-header file. Unfortunately, when that
+ /// function is defined inline, this rule requires the type data
+ /// to be emitted weakly, as if there were no key function.
+ ///
+ /// The ARM ABI observes that the ODR provides an additional guarantee:
+ /// a virtual function is always ODR-used, so if it is defined inline,
+ /// that definition must appear in every translation unit that defines
+ /// the class. Therefore, there is no reason to allow such functions
+ /// to serve as key functions.
+ ///
+ /// Because this changes the rules for emitting type data,
+ /// it can cause type data to be emitted with both weak and strong
+ /// linkage, which is not allowed on all platforms. Therefore,
+ /// exploiting this observation requires an ABI break and cannot be
+ /// done on a generic Itanium platform.
+ bool canKeyFunctionBeInline() const {
+ switch (getKind()) {
+ case GenericARM:
+ return false;
+
+ case GenericItanium:
+ case iOS: // old iOS compilers did not follow this rule
+ case Microsoft:
+ return true;
+ }
+ llvm_unreachable("bad ABI kind");
+ }
+
/// Try to parse an ABI name, returning false on error.
bool tryParse(llvm::StringRef name);
if (FD->hasAttr<ConstructorAttr>() || FD->hasAttr<DestructorAttr>())
return true;
- // The key function for a class is required.
- if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) {
- const CXXRecordDecl *RD = MD->getParent();
- if (MD->isOutOfLine() && RD->isDynamicClass()) {
- const CXXMethodDecl *KeyFunc = getKeyFunction(RD);
- if (KeyFunc && KeyFunc->getCanonicalDecl() == MD->getCanonicalDecl())
- return true;
+ // The key function for a class is required. This rule only comes
+ // into play when inline functions can be key functions, though.
+ if (getTargetInfo().getCXXABI().canKeyFunctionBeInline()) {
+ if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) {
+ const CXXRecordDecl *RD = MD->getParent();
+ if (MD->isOutOfLine() && RD->isDynamicClass()) {
+ const CXXMethodDecl *KeyFunc = getCurrentKeyFunction(RD);
+ if (KeyFunc && KeyFunc->getCanonicalDecl() == MD->getCanonicalDecl())
+ return true;
+ }
}
}
RecordLayoutBuilder(const RecordLayoutBuilder &) LLVM_DELETED_FUNCTION;
void operator=(const RecordLayoutBuilder &) LLVM_DELETED_FUNCTION;
-public:
- static const CXXMethodDecl *ComputeKeyFunction(const CXXRecordDecl *RD);
};
} // end anonymous namespace
<< D->getIdentifier();
}
-const CXXMethodDecl *
-RecordLayoutBuilder::ComputeKeyFunction(const CXXRecordDecl *RD) {
+static const CXXMethodDecl *computeKeyFunction(ASTContext &Context,
+ const CXXRecordDecl *RD) {
// If a class isn't polymorphic it doesn't have a key function.
if (!RD->isPolymorphic())
return 0;
TSK == TSK_ExplicitInstantiationDefinition)
return 0;
+ bool allowInlineFunctions =
+ Context.getTargetInfo().getCXXABI().canKeyFunctionBeInline();
+
for (CXXRecordDecl::method_iterator I = RD->method_begin(),
E = RD->method_end(); I != E; ++I) {
const CXXMethodDecl *MD = *I;
if (!MD->isUserProvided())
continue;
+ // In certain ABIs, ignore functions with out-of-line inline definitions.
+ if (!allowInlineFunctions) {
+ const FunctionDecl *Def;
+ if (MD->hasBody(Def) && Def->isInlineSpecified())
+ continue;
+ }
+
// We found it.
return MD;
}
return *NewEntry;
}
-const CXXMethodDecl *ASTContext::getKeyFunction(const CXXRecordDecl *RD) {
+const CXXMethodDecl *ASTContext::getCurrentKeyFunction(const CXXRecordDecl *RD) {
+ assert(RD->getDefinition() && "Cannot get key function for forward decl!");
RD = cast<CXXRecordDecl>(RD->getDefinition());
- assert(RD && "Cannot get key function for forward declarations!");
- const CXXMethodDecl *&Entry = KeyFunctions[RD];
- if (!Entry)
- Entry = RecordLayoutBuilder::ComputeKeyFunction(RD);
+ const CXXMethodDecl *&entry = KeyFunctions[RD];
+ if (!entry) {
+ entry = computeKeyFunction(*this, RD);
+ }
+
+ return entry;
+}
+
+void ASTContext::setNonKeyFunction(const CXXMethodDecl *method) {
+ assert(method == method->getFirstDeclaration() &&
+ "not working with method declaration from class definition");
- return Entry;
+ // Look up the cache entry. Since we're working with the first
+ // declaration, its parent must be the class definition, which is
+ // the correct key for the KeyFunctions hash.
+ llvm::DenseMap<const CXXRecordDecl*, const CXXMethodDecl*>::iterator
+ i = KeyFunctions.find(method->getParent());
+
+ // If it's not cached, there's nothing to do.
+ if (i == KeyFunctions.end()) return;
+
+ // If it is cached, check whether it's the target method, and if so,
+ // remove it from the cache.
+ if (i->second == method) {
+ // FIXME: remember that we did this for module / chained PCH state?
+ KeyFunctions.erase(i);
+ }
}
static uint64_t getFieldOffset(const ASTContext &C, const FieldDecl *FD) {
/// \param addr - a pointer to pass to the destructor function.
virtual void registerGlobalDtor(CodeGenFunction &CGF, llvm::Constant *dtor,
llvm::Constant *addr);
-
- /***************************** Virtual Tables *******************************/
-
- /// Generates and emits the virtual tables for a class.
- virtual void EmitVTables(const CXXRecordDecl *Class) = 0;
};
/// Creates an instance of a C++ ABI class.
/// the given type exists somewhere else, and that we should not emit the type
/// information in this translation unit. Assumes that it is not a
/// standard-library type.
-static bool ShouldUseExternalRTTIDescriptor(CodeGenModule &CGM, QualType Ty) {
+static bool ShouldUseExternalRTTIDescriptor(CodeGenModule &CGM,
+ QualType Ty) {
ASTContext &Context = CGM.getContext();
- // If RTTI is disabled, don't consider key functions.
+ // If RTTI is disabled, assume it might be disabled in the
+ // translation unit that defines any potential key function, too.
if (!Context.getLangOpts().RTTI) return false;
if (const RecordType *RecordTy = dyn_cast<RecordType>(Ty)) {
if (!RD->isDynamicClass())
return false;
- return !CGM.getVTables().ShouldEmitVTableInThisTU(RD);
+ // FIXME: this may need to be reconsidered if the key function
+ // changes.
+ return CGM.getVTables().isVTableExternal(RD);
}
return false;
CodeGenVTables::CodeGenVTables(CodeGenModule &CGM)
: CGM(CGM), VTContext(CGM.getContext()) { }
-bool CodeGenVTables::ShouldEmitVTableInThisTU(const CXXRecordDecl *RD) {
- assert(RD->isDynamicClass() && "Non dynamic classes have no VTable.");
-
- TemplateSpecializationKind TSK = RD->getTemplateSpecializationKind();
- if (TSK == TSK_ExplicitInstantiationDeclaration)
- return false;
-
- const CXXMethodDecl *KeyFunction = CGM.getContext().getKeyFunction(RD);
- if (!KeyFunction)
- return true;
-
- // Itanium C++ ABI, 5.2.6 Instantiated Templates:
- // An instantiation of a class template requires:
- // - In the object where instantiated, the virtual table...
- if (TSK == TSK_ImplicitInstantiation ||
- TSK == TSK_ExplicitInstantiationDefinition)
- return true;
-
- // If we're building with optimization, we always emit VTables since that
- // allows for virtual function calls to be devirtualized.
- // (We don't want to do this in -fapple-kext mode however).
- if (CGM.getCodeGenOpts().OptimizationLevel && !CGM.getLangOpts().AppleKext)
- return true;
-
- return KeyFunction->hasBody();
-}
-
llvm::Constant *CodeGenModule::GetAddrOfThunk(GlobalDecl GD,
const ThunkInfo &Thunk) {
const CXXMethodDecl *MD = cast<CXXMethodDecl>(GD.getDecl());
if (VTable)
return VTable;
- // We may need to generate a definition for this vtable.
- if (ShouldEmitVTableInThisTU(RD))
- CGM.DeferredVTables.push_back(RD);
+ // Queue up this v-table for possible deferred emission.
+ CGM.addDeferredVTable(RD);
SmallString<256> OutName;
llvm::raw_svector_ostream Out(OutName);
return VTable;
}
+/// Compute the required linkage of the v-table for the given class.
+///
+/// Note that we only call this at the end of the translation unit.
+llvm::GlobalVariable::LinkageTypes
+CodeGenModule::getVTableLinkage(const CXXRecordDecl *RD) {
+ if (RD->getLinkage() != ExternalLinkage)
+ return llvm::GlobalVariable::InternalLinkage;
+
+ // We're at the end of the translation unit, so the current key
+ // function is fully correct.
+ if (const CXXMethodDecl *keyFunction = Context.getCurrentKeyFunction(RD)) {
+ // If this class has a key function, use that to determine the
+ // linkage of the vtable.
+ const FunctionDecl *def = 0;
+ if (keyFunction->hasBody(def))
+ keyFunction = cast<CXXMethodDecl>(def);
+
+ switch (keyFunction->getTemplateSpecializationKind()) {
+ case TSK_Undeclared:
+ case TSK_ExplicitSpecialization:
+ // When compiling with optimizations turned on, we emit all vtables,
+ // even if the key function is not defined in the current translation
+ // unit. If this is the case, use available_externally linkage.
+ if (!def && CodeGenOpts.OptimizationLevel)
+ return llvm::GlobalVariable::AvailableExternallyLinkage;
+
+ if (keyFunction->isInlined())
+ return !Context.getLangOpts().AppleKext ?
+ llvm::GlobalVariable::LinkOnceODRLinkage :
+ llvm::Function::InternalLinkage;
+
+ return llvm::GlobalVariable::ExternalLinkage;
+
+ case TSK_ImplicitInstantiation:
+ return !Context.getLangOpts().AppleKext ?
+ llvm::GlobalVariable::LinkOnceODRLinkage :
+ llvm::Function::InternalLinkage;
+
+ case TSK_ExplicitInstantiationDefinition:
+ return !Context.getLangOpts().AppleKext ?
+ llvm::GlobalVariable::WeakODRLinkage :
+ llvm::Function::InternalLinkage;
+
+ case TSK_ExplicitInstantiationDeclaration:
+ // FIXME: Use available_externally linkage. However, this currently
+ // breaks LLVM's build due to undefined symbols.
+ // return llvm::GlobalVariable::AvailableExternallyLinkage;
+ return !Context.getLangOpts().AppleKext ?
+ llvm::GlobalVariable::LinkOnceODRLinkage :
+ llvm::Function::InternalLinkage;
+ }
+ }
+
+ // -fapple-kext mode does not support weak linkage, so we must use
+ // internal linkage.
+ if (Context.getLangOpts().AppleKext)
+ return llvm::Function::InternalLinkage;
+
+ switch (RD->getTemplateSpecializationKind()) {
+ case TSK_Undeclared:
+ case TSK_ExplicitSpecialization:
+ case TSK_ImplicitInstantiation:
+ return llvm::GlobalVariable::LinkOnceODRLinkage;
+
+ case TSK_ExplicitInstantiationDeclaration:
+ // FIXME: Use available_externally linkage. However, this currently
+ // breaks LLVM's build due to undefined symbols.
+ // return llvm::GlobalVariable::AvailableExternallyLinkage;
+ return llvm::GlobalVariable::LinkOnceODRLinkage;
+
+ case TSK_ExplicitInstantiationDefinition:
+ return llvm::GlobalVariable::WeakODRLinkage;
+ }
+
+ llvm_unreachable("Invalid TemplateSpecializationKind!");
+}
+
+/// This is a callback from Sema to tell us that it believes that a
+/// particular v-table is required to be emitted in this translation
+/// unit.
+///
+/// The reason we don't simply trust this callback is because Sema
+/// will happily report that something is used even when it's used
+/// only in code that we don't actually have to emit.
+///
+/// \param isRequired - if true, the v-table is mandatory, e.g.
+/// because the translation unit defines the key function
+void CodeGenModule::EmitVTable(CXXRecordDecl *theClass, bool isRequired) {
+ if (!isRequired) return;
+
+ VTables.GenerateClassData(theClass);
+}
+
void
-CodeGenVTables::GenerateClassData(llvm::GlobalVariable::LinkageTypes Linkage,
- const CXXRecordDecl *RD) {
+CodeGenVTables::GenerateClassData(const CXXRecordDecl *RD) {
+ // First off, check whether we've already emitted the v-table and
+ // associated stuff.
llvm::GlobalVariable *VTable = GetAddrOfVTable(RD);
if (VTable->hasInitializer())
return;
+ llvm::GlobalVariable::LinkageTypes Linkage = CGM.getVTableLinkage(RD);
EmitVTableDefinition(VTable, Linkage, RD);
if (RD->getNumVBases()) {
DC->getParent()->isTranslationUnit())
CGM.EmitFundamentalRTTIDescriptors();
}
+
+/// At this point in the translation unit, does it appear that can we
+/// rely on the vtable being defined elsewhere in the program?
+///
+/// The response is really only definitive when called at the end of
+/// the translation unit.
+///
+/// The only semantic restriction here is that the object file should
+/// not contain a v-table definition when that v-table is defined
+/// strongly elsewhere. Otherwise, we'd just like to avoid emitting
+/// v-tables when unnecessary.
+bool CodeGenVTables::isVTableExternal(const CXXRecordDecl *RD) {
+ assert(RD->isDynamicClass() && "Non dynamic classes have no VTable.");
+
+ // If we have an explicit instantiation declaration (and not a
+ // definition), the v-table is defined elsewhere.
+ TemplateSpecializationKind TSK = RD->getTemplateSpecializationKind();
+ if (TSK == TSK_ExplicitInstantiationDeclaration)
+ return true;
+
+ // Otherwise, if the class is an instantiated template, the
+ // v-table must be defined here.
+ if (TSK == TSK_ImplicitInstantiation ||
+ TSK == TSK_ExplicitInstantiationDefinition)
+ return false;
+
+ // Otherwise, if the class doesn't have a key function (possibly
+ // anymore), the v-table must be defined here.
+ const CXXMethodDecl *keyFunction = CGM.getContext().getCurrentKeyFunction(RD);
+ if (!keyFunction)
+ return false;
+
+ // Otherwise, if we don't have a definition of the key function, the
+ // v-table must be defined somewhere else.
+ return !keyFunction->hasBody();
+}
+
+/// Given that we're currently at the end of the translation unit, and
+/// we've emitted a reference to the v-table for this class, should
+/// we define that v-table?
+static bool shouldEmitVTableAtEndOfTranslationUnit(CodeGenModule &CGM,
+ const CXXRecordDecl *RD) {
+ // If we're building with optimization, we always emit v-tables
+ // since that allows for virtual function calls to be devirtualized.
+ // If the v-table is defined strongly elsewhere, this definition
+ // will be emitted available_externally.
+ //
+ // However, we don't want to do this in -fapple-kext mode, because
+ // kext mode does not permit devirtualization.
+ if (CGM.getCodeGenOpts().OptimizationLevel && !CGM.getLangOpts().AppleKext)
+ return true;
+
+ return !CGM.getVTables().isVTableExternal(RD);
+}
+
+/// Given that at some point we emitted a reference to one or more
+/// v-tables, and that we are now at the end of the translation unit,
+/// decide whether we should emit them.
+void CodeGenModule::EmitDeferredVTables() {
+#ifndef NDEBUG
+ // Remember the size of DeferredVTables, because we're going to assume
+ // that this entire operation doesn't modify it.
+ size_t savedSize = DeferredVTables.size();
+#endif
+
+ typedef std::vector<const CXXRecordDecl *>::const_iterator const_iterator;
+ for (const_iterator i = DeferredVTables.begin(),
+ e = DeferredVTables.end(); i != e; ++i) {
+ const CXXRecordDecl *RD = *i;
+ if (shouldEmitVTableAtEndOfTranslationUnit(*this, RD))
+ VTables.GenerateClassData(RD);
+ }
+
+ assert(savedSize == DeferredVTables.size() &&
+ "deferred extra v-tables during v-table emission?");
+ DeferredVTables.clear();
+}
VTableContext &getVTableContext() { return VTContext; }
- /// \brief True if the VTable of this record must be emitted in the
- /// translation unit.
- bool ShouldEmitVTableInThisTU(const CXXRecordDecl *RD);
-
/// needsVTTParameter - Return whether the given global decl needs a VTT
/// parameter, which it does if it's a base constructor or destructor with
/// virtual bases.
/// EmitThunks - Emit the associated thunks for the given global decl.
void EmitThunks(GlobalDecl GD);
- /// GenerateClassData - Generate all the class data required to be generated
- /// upon definition of a KeyFunction. This includes the vtable, the
- /// rtti data structure and the VTT.
- ///
- /// \param Linkage - The desired linkage of the vtable, the RTTI and the VTT.
- void GenerateClassData(llvm::GlobalVariable::LinkageTypes Linkage,
- const CXXRecordDecl *RD);
+ /// GenerateClassData - Generate all the class data required to be
+ /// generated upon definition of a KeyFunction. This includes the
+ /// vtable, the RTTI data structure (if RTTI is enabled) and the VTT
+ /// (if the class has virtual bases).
+ void GenerateClassData(const CXXRecordDecl *RD);
+
+ bool isVTableExternal(const CXXRecordDecl *RD);
};
} // end namespace CodeGen
// that don't have the key function's definition. But ignore
// this if we're emitting RTTI under -fno-rtti.
if (!(TVK != TVK_ForRTTI) || LangOpts.RTTI) {
- if (Context.getKeyFunction(RD))
+ // FIXME: what should we do if we "lose" the key function during
+ // the emission of the file?
+ if (Context.getCurrentKeyFunction(RD))
return;
}
// previously unused static decl may become used during the generation of code
// for a static function, iterate until no changes are made.
- while (!DeferredDeclsToEmit.empty() || !DeferredVTables.empty()) {
+ while (true) {
if (!DeferredVTables.empty()) {
- const CXXRecordDecl *RD = DeferredVTables.back();
- DeferredVTables.pop_back();
- getCXXABI().EmitVTables(RD);
- continue;
+ EmitDeferredVTables();
+
+ // Emitting a v-table doesn't directly cause more v-tables to
+ // become deferred, although it can cause functions to be
+ // emitted that then need those v-tables.
+ assert(DeferredVTables.empty());
}
+ // Stop if we're out of both deferred v-tables and deferred declarations.
+ if (DeferredDeclsToEmit.empty()) break;
+
GlobalDecl D = DeferredDeclsToEmit.back();
DeferredDeclsToEmit.pop_back();
EmitGlobalVarDefinition(D);
}
-void CodeGenModule::EmitVTable(CXXRecordDecl *Class, bool DefinitionRequired) {
- if (DefinitionRequired)
- getCXXABI().EmitVTables(Class);
-}
-
-llvm::GlobalVariable::LinkageTypes
-CodeGenModule::getVTableLinkage(const CXXRecordDecl *RD) {
- if (RD->getLinkage() != ExternalLinkage)
- return llvm::GlobalVariable::InternalLinkage;
-
- if (const CXXMethodDecl *KeyFunction
- = RD->getASTContext().getKeyFunction(RD)) {
- // If this class has a key function, use that to determine the linkage of
- // the vtable.
- const FunctionDecl *Def = 0;
- if (KeyFunction->hasBody(Def))
- KeyFunction = cast<CXXMethodDecl>(Def);
-
- switch (KeyFunction->getTemplateSpecializationKind()) {
- case TSK_Undeclared:
- case TSK_ExplicitSpecialization:
- // When compiling with optimizations turned on, we emit all vtables,
- // even if the key function is not defined in the current translation
- // unit. If this is the case, use available_externally linkage.
- if (!Def && CodeGenOpts.OptimizationLevel)
- return llvm::GlobalVariable::AvailableExternallyLinkage;
-
- if (KeyFunction->isInlined())
- return !Context.getLangOpts().AppleKext ?
- llvm::GlobalVariable::LinkOnceODRLinkage :
- llvm::Function::InternalLinkage;
-
- return llvm::GlobalVariable::ExternalLinkage;
-
- case TSK_ImplicitInstantiation:
- return !Context.getLangOpts().AppleKext ?
- llvm::GlobalVariable::LinkOnceODRLinkage :
- llvm::Function::InternalLinkage;
-
- case TSK_ExplicitInstantiationDefinition:
- return !Context.getLangOpts().AppleKext ?
- llvm::GlobalVariable::WeakODRLinkage :
- llvm::Function::InternalLinkage;
-
- case TSK_ExplicitInstantiationDeclaration:
- // FIXME: Use available_externally linkage. However, this currently
- // breaks LLVM's build due to undefined symbols.
- // return llvm::GlobalVariable::AvailableExternallyLinkage;
- return !Context.getLangOpts().AppleKext ?
- llvm::GlobalVariable::LinkOnceODRLinkage :
- llvm::Function::InternalLinkage;
- }
- }
-
- if (Context.getLangOpts().AppleKext)
- return llvm::Function::InternalLinkage;
-
- switch (RD->getTemplateSpecializationKind()) {
- case TSK_Undeclared:
- case TSK_ExplicitSpecialization:
- case TSK_ImplicitInstantiation:
- // FIXME: Use available_externally linkage. However, this currently
- // breaks LLVM's build due to undefined symbols.
- // return llvm::GlobalVariable::AvailableExternallyLinkage;
- case TSK_ExplicitInstantiationDeclaration:
- return llvm::GlobalVariable::LinkOnceODRLinkage;
-
- case TSK_ExplicitInstantiationDefinition:
- return llvm::GlobalVariable::WeakODRLinkage;
- }
-
- llvm_unreachable("Invalid TemplateSpecializationKind!");
-}
-
CharUnits CodeGenModule::GetTargetTypeStoreSize(llvm::Type *Ty) const {
return Context.toCharUnitsFromBits(
TheDataLayout.getTypeStoreSizeInBits(Ty));
/// is done.
std::vector<GlobalDecl> DeferredDeclsToEmit;
+ /// DeferredVTables - A queue of (optional) vtables to consider emitting.
+ std::vector<const CXXRecordDecl*> DeferredVTables;
+
/// LLVMUsed - List of global values which are required to be
/// present in the object file; bitcast to i8*. This is used for
/// forcing visibility of symbols which may otherwise be optimized
GetLLVMLinkageVarDefinition(const VarDecl *D,
llvm::GlobalVariable *GV);
- std::vector<const CXXRecordDecl*> DeferredVTables;
-
/// Emit all the global annotations.
void EmitGlobalAnnotations();
const SanitizerOptions &getSanOpts() const { return SanOpts; }
+ void addDeferredVTable(const CXXRecordDecl *RD) {
+ DeferredVTables.push_back(RD);
+ }
+
private:
llvm::GlobalValue *GetGlobalValue(StringRef Ref);
/// was deferred.
void EmitDeferred();
+ /// EmitDeferredVTables - Emit any vtables which we deferred and
+ /// still have a use for.
+ void EmitDeferredVTables();
+
/// EmitLLVMUsed - Emit the llvm.used metadata used to force
/// references to global which may otherwise be optimized out.
void EmitLLVMUsed();
llvm::GlobalVariable *DeclPtr, bool PerformInit);
void registerGlobalDtor(CodeGenFunction &CGF, llvm::Constant *dtor,
llvm::Constant *addr);
-
- void EmitVTables(const CXXRecordDecl *Class);
};
class ARMCXXABI : public ItaniumCXXABI {
CGF.registerGlobalDtorWithAtExit(dtor, addr);
}
-
-/// Generate and emit virtual tables for the given class.
-void ItaniumCXXABI::EmitVTables(const CXXRecordDecl *Class) {
- CGM.getVTables().GenerateClassData(CGM.getVTableLinkage(Class), Class);
-}
llvm::GlobalVariable *DeclPtr,
bool PerformInit);
- void EmitVTables(const CXXRecordDecl *Class);
-
-
// ==== Notes on array cookies =========
//
// MSVC seems to only use cookies when the class has a destructor; a
CGF.EmitCXXGlobalVarDeclInit(D, DeclPtr, PerformInit);
}
-void MicrosoftCXXABI::EmitVTables(const CXXRecordDecl *Class) {
- CGM.getVTables().GenerateClassData(CGM.getVTableLinkage(Class), Class);
-}
-
CGCXXABI *clang::CodeGen::CreateMicrosoftCXXABI(CodeGenModule &CGM) {
return new MicrosoftCXXABI(CGM);
}
I != E; ++I) {
assert(!(*I)->isDependentType() &&
"Should not see dependent types here!");
- if (const CXXMethodDecl *KeyFunction = Context.getKeyFunction(*I)) {
+ if (const CXXMethodDecl *KeyFunction = Context.getCurrentKeyFunction(*I)) {
const FunctionDecl *Definition = 0;
if (KeyFunction->hasBody(Definition))
MarkVTableUsed(Definition->getLocation(), *I, true);
}
} else {
- if (isa<CXXMethodDecl>(NewFD)) // Set access for out-of-line definitions
- NewFD->setAccess(OldDecl->getAccess());
+ // This needs to happen first so that 'inline' propagates.
NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl));
+
+ if (isa<CXXMethodDecl>(NewFD)) {
+ // A valid redeclaration of a C++ method must be out-of-line,
+ // but (unfortunately) it's not necessarily a definition
+ // because of templates, which means that the previous
+ // declaration is not necessarily from the class definition.
+
+ // For just setting the access, that doesn't matter.
+ CXXMethodDecl *oldMethod = cast<CXXMethodDecl>(OldDecl);
+ NewFD->setAccess(oldMethod->getAccess());
+
+ // Update the key-function state if necessary for this ABI.
+ if (NewFD->isInlined() &&
+ !Context.getTargetInfo().getCXXABI().canKeyFunctionBeInline()) {
+ // setNonKeyFunction needs to work with the original
+ // declaration from the class definition, and isVirtual() is
+ // just faster in that case, so map back to that now.
+ oldMethod = cast<CXXMethodDecl>(oldMethod->getFirstDeclaration());
+ if (oldMethod->isVirtual()) {
+ Context.setNonKeyFunction(oldMethod);
+ }
+ }
+ }
}
}
// If this class has a key function, but that key function is
// defined in another translation unit, we don't need to emit the
// vtable even though we're using it.
- const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class);
+ const CXXMethodDecl *KeyFunction = Context.getCurrentKeyFunction(Class);
if (KeyFunction && !KeyFunction->hasBody()) {
switch (KeyFunction->getTemplateSpecializationKind()) {
case TSK_Undeclared:
Record.push_back(CXXRecNotTemplate);
}
- // Store the key function to avoid deserializing every method so we can
- // compute it.
+ // Store (what we currently believe to be) the key function to avoid
+ // deserializing every method so we can compute it.
if (D->IsCompleteDefinition)
- Writer.AddDeclRef(Context.getKeyFunction(D), Record);
+ Writer.AddDeclRef(Context.getCurrentKeyFunction(D), Record);
Code = serialization::DECL_CXX_RECORD;
}
#include <typeinfo>
-// Test1::A's key function (f) is not defined in this translation unit, but in
-// order to devirtualize calls, we emit the class related data with
+// Test1::A's key function (f) is not defined in this translation
+// unit, but in order to devirtualize calls, we emit the v-table with
// available_externally linkage.
+//
+// There's no real reason to do this to the RTTI, though.
// CHECK-TEST1: @_ZTVN5Test11AE = available_externally
-// CHECK-TEST1: @_ZTSN5Test11AE = available_externally
-// CHECK-TEST1: @_ZTIN5Test11AE = available_externally
+// CHECK-TEST1: @_ZTIN5Test11AE = external constant i8*
namespace Test1 {
struct A {
--- /dev/null
+// RUN: %clang_cc1 %s -triple=armv7-unknown-unknown -emit-llvm -o - | FileCheck %s
+// RUN: %clang_cc1 %s -triple=armv7-unknown-unknown -emit-llvm -o - | FileCheck -check-prefix=CHECK-LATE %s
+
+// The 'a' variants ask for the v-table first.
+// The 'b' variants ask for the v-table second.
+// The 'c' variants ask for the v-table third.
+// We do a separate CHECK-LATE pass because the RTTI defintion gets
+// changed after the fact, which causes reordering of the globals.
+
+// These are not separated into namespaces because the way that Sema
+// currently reports namespaces to IR-generation (i.e., en masse for
+// the entire namespace at once) subverts the ordering that we're
+// trying to test.
+
+namespace std { class type_info; }
+extern void use(const std::type_info &rtti);
+
+/*** Test0a ******************************************************************/
+
+struct Test0a {
+ Test0a();
+ virtual inline void foo();
+ virtual void bar();
+};
+
+// V-table should be defined externally.
+Test0a::Test0a() { use(typeid(Test0a)); }
+// CHECK: @_ZTV6Test0a = external unnamed_addr constant
+// CHECK: @_ZTI6Test0a = external constant
+
+// This is still not a key function.
+void Test0a::foo() {}
+
+/*** Test0b ******************************************************************/
+
+struct Test0b {
+ Test0b();
+ virtual inline void foo();
+ virtual void bar();
+};
+
+// This is still not a key function.
+void Test0b::foo() {}
+
+// V-table should be defined externally.
+Test0b::Test0b() { use(typeid(Test0b)); }
+// CHECK: @_ZTV6Test0b = external unnamed_addr constant
+// CHECK: @_ZTI6Test0b = external constant
+
+/*** Test1a ******************************************************************/
+
+struct Test1a {
+ Test1a();
+ virtual void foo();
+ virtual void bar();
+};
+
+// V-table should be defined externally.
+Test1a::Test1a() { use(typeid(Test1a)); }
+// CHECK: @_ZTV6Test1a = external unnamed_addr constant
+// CHECK: @_ZTI6Test1a = external constant
+
+// 'bar' becomes the key function when 'foo' is defined inline.
+inline void Test1a::foo() {}
+
+/*** Test1b ******************************************************************/
+
+struct Test1b {
+ Test1b();
+ virtual void foo();
+ virtual void bar();
+};
+
+// 'bar' becomes the key function when 'foo' is defined inline.
+inline void Test1b::foo() {}
+
+// V-table should be defined externally.
+Test1b::Test1b() { use(typeid(Test1b)); }
+// CHECK: @_ZTV6Test1b = external unnamed_addr constant
+// CHECK: @_ZTI6Test1b = external constant
+
+/*** Test2a ******************************************************************/
+
+struct Test2a {
+ Test2a();
+ virtual void foo();
+ virtual void bar();
+};
+
+// V-table should be defined with strong linkage.
+Test2a::Test2a() { use(typeid(Test2a)); }
+// CHECK: @_ZTV6Test2a = unnamed_addr constant
+// CHECK-LATE: @_ZTS6Test2a = constant
+// CHECK-LATE: @_ZTI6Test2a = unnamed_addr constant
+
+// 'bar' becomes the key function when 'foo' is defined inline.
+void Test2a::bar() {}
+inline void Test2a::foo() {}
+
+/*** Test2b ******************************************************************/
+
+struct Test2b {
+ Test2b();
+ virtual void foo();
+ virtual void bar();
+};
+
+// 'bar' becomes the key function when 'foo' is defined inline.
+void Test2b::bar() {}
+
+// V-table should be defined with strong linkage.
+Test2b::Test2b() { use(typeid(Test2b)); }
+// CHECK: @_ZTV6Test2b = unnamed_addr constant
+// CHECK-LATE: @_ZTS6Test2b = constant
+// CHECK-LATE: @_ZTI6Test2b = unnamed_addr constant
+
+inline void Test2b::foo() {}
+
+/*** Test2c ******************************************************************/
+
+struct Test2c {
+ Test2c();
+ virtual void foo();
+ virtual void bar();
+};
+
+// 'bar' becomes the key function when 'foo' is defined inline.
+void Test2c::bar() {}
+inline void Test2c::foo() {}
+
+// V-table should be defined with strong linkage.
+Test2c::Test2c() { use(typeid(Test2c)); }
+// CHECK: @_ZTV6Test2c = unnamed_addr constant
+// CHECK: @_ZTS6Test2c = constant
+// CHECK: @_ZTI6Test2c = unnamed_addr constant
+
+/*** Test3a ******************************************************************/
+
+struct Test3a {
+ Test3a();
+ virtual void foo();
+ virtual void bar();
+};
+
+// V-table should be defined with weak linkage.
+Test3a::Test3a() { use(typeid(Test3a)); }
+// CHECK: @_ZTV6Test3a = linkonce_odr unnamed_addr constant
+// CHECK-LATE: @_ZTS6Test3a = linkonce_odr constant
+// CHECK-LATE: @_ZTI6Test3a = linkonce_odr unnamed_addr constant
+
+// There ceases to be a key function after these declarations.
+inline void Test3a::bar() {}
+inline void Test3a::foo() {}
+
+/*** Test3b ******************************************************************/
+
+struct Test3b {
+ Test3b();
+ virtual void foo();
+ virtual void bar();
+};
+
+// There ceases to be a key function after these declarations.
+inline void Test3b::bar() {}
+
+// V-table should be defined with weak linkage.
+Test3b::Test3b() { use(typeid(Test3b)); }
+// CHECK: @_ZTV6Test3b = linkonce_odr unnamed_addr constant
+// CHECK-LATE: @_ZTS6Test3b = linkonce_odr constant
+// CHECK-LATE: @_ZTI6Test3b = linkonce_odr unnamed_addr constant
+
+inline void Test3b::foo() {}
+
+/*** Test3c ******************************************************************/
+
+struct Test3c {
+ Test3c();
+ virtual void foo();
+ virtual void bar();
+};
+
+// There ceases to be a key function after these declarations.
+inline void Test3c::bar() {}
+inline void Test3c::foo() {}
+
+// V-table should be defined with weak linkage.
+Test3c::Test3c() { use(typeid(Test3c)); }
+// CHECK: @_ZTV6Test3c = linkonce_odr unnamed_addr constant
+// CHECK: @_ZTS6Test3c = linkonce_odr constant
+// CHECK: @_ZTI6Test3c = linkonce_odr unnamed_addr constant
+
+/*** Test4a ******************************************************************/
+
+template <class T> struct Test4a {
+ Test4a();
+ virtual void foo();
+ virtual void bar();
+};
+
+// V-table should be defined with weak linkage.
+template <> Test4a<int>::Test4a() { use(typeid(Test4a)); }
+// CHECK: @_ZTV6Test4aIiE = linkonce_odr unnamed_addr constant
+// CHECK: @_ZTS6Test4aIiE = linkonce_odr constant
+// CHECK: @_ZTI6Test4aIiE = linkonce_odr unnamed_addr constant
+
+// There ceases to be a key function after these declarations.
+template <> inline void Test4a<int>::bar() {}
+template <> inline void Test4a<int>::foo() {}
+
+/*** Test4b ******************************************************************/
+
+template <class T> struct Test4b {
+ Test4b();
+ virtual void foo();
+ virtual void bar();
+};
+
+// There ceases to be a key function after these declarations.
+template <> inline void Test4b<int>::bar() {}
+
+// V-table should be defined with weak linkage.
+template <> Test4b<int>::Test4b() { use(typeid(Test4b)); }
+// CHECK: @_ZTV6Test4bIiE = linkonce_odr unnamed_addr constant
+// CHECK: @_ZTS6Test4bIiE = linkonce_odr constant
+// CHECK: @_ZTI6Test4bIiE = linkonce_odr unnamed_addr constant
+
+template <> inline void Test4b<int>::foo() {}
+
+/*** Test4c ******************************************************************/
+
+template <class T> struct Test4c {
+ Test4c();
+ virtual void foo();
+ virtual void bar();
+};
+
+// There ceases to be a key function after these declarations.
+template <> inline void Test4c<int>::bar() {}
+template <> inline void Test4c<int>::foo() {}
+
+// V-table should be defined with weak linkage.
+template <> Test4c<int>::Test4c() { use(typeid(Test4c)); }
+// CHECK: @_ZTV6Test4cIiE = linkonce_odr unnamed_addr constant
+// CHECK: @_ZTS6Test4cIiE = linkonce_odr constant
+// CHECK: @_ZTI6Test4cIiE = linkonce_odr unnamed_addr constant
+
+/*** Test5a ******************************************************************/
+
+template <class T> struct Test5a {
+ Test5a();
+ virtual void foo();
+ virtual void bar();
+};
+
+template <> inline void Test5a<int>::bar();
+template <> inline void Test5a<int>::foo();
+
+// V-table should be defined with weak linkage.
+template <> Test5a<int>::Test5a() { use(typeid(Test5a)); }
+// CHECK: @_ZTV6Test5aIiE = linkonce_odr unnamed_addr constant
+// CHECK: @_ZTS6Test5aIiE = linkonce_odr constant
+// CHECK: @_ZTI6Test5aIiE = linkonce_odr unnamed_addr constant
+
+// There ceases to be a key function after these declarations.
+template <> inline void Test5a<int>::bar() {}
+template <> inline void Test5a<int>::foo() {}
+
+/*** Test5b ******************************************************************/
+
+template <class T> struct Test5b {
+ Test5b();
+ virtual void foo();
+ virtual void bar();
+};
+
+// There ceases to be a key function after these declarations.
+template <> inline void Test5a<int>::bar();
+template <> inline void Test5b<int>::bar() {}
+
+// V-table should be defined with weak linkage.
+template <> Test5b<int>::Test5b() { use(typeid(Test5b)); }
+// CHECK: @_ZTV6Test5bIiE = linkonce_odr unnamed_addr constant
+// CHECK: @_ZTS6Test5bIiE = linkonce_odr constant
+// CHECK: @_ZTI6Test5bIiE = linkonce_odr unnamed_addr constant
+
+template <> inline void Test5a<int>::foo();
+template <> inline void Test5b<int>::foo() {}
+
+/*** Test5c ******************************************************************/
+
+template <class T> struct Test5c {
+ Test5c();
+ virtual void foo();
+ virtual void bar();
+};
+
+// There ceases to be a key function after these declarations.
+template <> inline void Test5a<int>::bar();
+template <> inline void Test5a<int>::foo();
+template <> inline void Test5c<int>::bar() {}
+template <> inline void Test5c<int>::foo() {}
+
+// V-table should be defined with weak linkage.
+template <> Test5c<int>::Test5c() { use(typeid(Test5c)); }
+// CHECK: @_ZTV6Test5cIiE = linkonce_odr unnamed_addr constant
+// CHECK: @_ZTS6Test5cIiE = linkonce_odr constant
+// CHECK: @_ZTI6Test5cIiE = linkonce_odr unnamed_addr constant
--- /dev/null
+// RUN: %clang_cc1 %s -triple=armv7-apple-darwin -emit-llvm -o - | FileCheck %s
+// RUN: %clang_cc1 %s -triple=armv7-apple-darwin -emit-llvm -o - | FileCheck -check-prefix=CHECK-LATE %s
+
+// The 'a' variants ask for the v-table first.
+// The 'b' variants ask for the v-table second.
+// The 'c' variants ask for the v-table third.
+// We do a separate CHECK-LATE pass because the RTTI defintion gets
+// changed after the fact, which causes reordering of the globals.
+
+// These are not separated into namespaces because the way that Sema
+// currently reports namespaces to IR-generation (i.e., en masse for
+// the entire namespace at once) subverts the ordering that we're
+// trying to test.
+
+namespace std { class type_info; }
+extern void use(const std::type_info &rtti);
+
+/*** Test0a ******************************************************************/
+
+struct Test0a {
+ Test0a();
+ virtual inline void foo();
+ virtual void bar();
+};
+
+// V-table should be defined externally.
+Test0a::Test0a() { use(typeid(Test0a)); }
+// CHECK: @_ZTV6Test0a = external unnamed_addr constant
+// CHECK: @_ZTI6Test0a = external constant
+
+// This is not a key function.
+void Test0a::foo() {}
+
+/*** Test0b ******************************************************************/
+
+struct Test0b {
+ Test0b();
+ virtual inline void foo();
+ virtual void bar();
+};
+
+// This is not a key function.
+void Test0b::foo() {}
+
+// V-table should be defined externally.
+Test0b::Test0b() { use(typeid(Test0b)); }
+// CHECK: @_ZTV6Test0b = external unnamed_addr constant
+// CHECK: @_ZTI6Test0b = external constant
+
+/*** Test1a ******************************************************************/
+
+struct Test1a {
+ Test1a();
+ virtual void foo();
+ virtual void bar();
+};
+
+// V-table needs to be defined weakly.
+Test1a::Test1a() { use(typeid(Test1a)); }
+// CHECK: @_ZTV6Test1a = linkonce_odr unnamed_addr constant
+// CHECK-LATE: @_ZTS6Test1a = linkonce_odr constant
+// CHECK-LATE: @_ZTI6Test1a = linkonce_odr unnamed_addr constant
+
+// This defines the key function.
+inline void Test1a::foo() {}
+
+/*** Test1b ******************************************************************/
+
+struct Test1b {
+ Test1b();
+ virtual void foo();
+ virtual void bar();
+};
+
+// This defines the key function.
+inline void Test1b::foo() {}
+
+// V-table should be defined weakly..
+Test1b::Test1b() { use(typeid(Test1b)); }
+// CHECK: @_ZTV6Test1b = linkonce_odr unnamed_addr constant
+// CHECK: @_ZTS6Test1b = linkonce_odr constant
+// CHECK: @_ZTI6Test1b = linkonce_odr unnamed_addr constant
+
+/*** Test2a ******************************************************************/
+
+struct Test2a {
+ Test2a();
+ virtual void foo();
+ virtual void bar();
+};
+
+// V-table should be defined with weak linkage.
+Test2a::Test2a() { use(typeid(Test2a)); }
+// CHECK: @_ZTV6Test2a = linkonce_odr unnamed_addr constant
+// CHECK-LATE: @_ZTS6Test2a = linkonce_odr constant
+// CHECK-LATE: @_ZTI6Test2a = linkonce_odr unnamed_addr constant
+
+void Test2a::bar() {}
+inline void Test2a::foo() {}
+
+/*** Test2b ******************************************************************/
+
+struct Test2b {
+ Test2b();
+ virtual void foo();
+ virtual void bar();
+};
+
+void Test2b::bar() {}
+
+// V-table should be defined with weak linkage.
+Test2b::Test2b() { use(typeid(Test2b)); }
+// CHECK: @_ZTV6Test2b = linkonce_odr unnamed_addr constant
+// CHECK-LATE: @_ZTS6Test2b = linkonce_odr constant
+// CHECK-LATE: @_ZTI6Test2b = linkonce_odr unnamed_addr constant
+
+inline void Test2b::foo() {}
+
+/*** Test2c ******************************************************************/
+
+struct Test2c {
+ Test2c();
+ virtual void foo();
+ virtual void bar();
+};
+
+void Test2c::bar() {}
+inline void Test2c::foo() {}
+
+// V-table should be defined with weak linkage.
+Test2c::Test2c() { use(typeid(Test2c)); }
+// CHECK: @_ZTV6Test2c = linkonce_odr unnamed_addr constant
+// CHECK: @_ZTS6Test2c = linkonce_odr constant
+// CHECK: @_ZTI6Test2c = linkonce_odr unnamed_addr constant
+
+/*** Test3a ******************************************************************/
+
+struct Test3a {
+ Test3a();
+ virtual void foo();
+ virtual void bar();
+};
+
+// V-table should be defined with weak linkage.
+Test3a::Test3a() { use(typeid(Test3a)); }
+// CHECK: @_ZTV6Test3a = linkonce_odr unnamed_addr constant
+// CHECK-LATE: @_ZTS6Test3a = linkonce_odr constant
+// CHECK-LATE: @_ZTI6Test3a = linkonce_odr unnamed_addr constant
+
+// This defines the key function.
+inline void Test3a::bar() {}
+inline void Test3a::foo() {}
+
+/*** Test3b ******************************************************************/
+
+struct Test3b {
+ Test3b();
+ virtual void foo();
+ virtual void bar();
+};
+
+inline void Test3b::bar() {}
+
+// V-table should be defined with weak linkage.
+Test3b::Test3b() { use(typeid(Test3b)); }
+// CHECK: @_ZTV6Test3b = linkonce_odr unnamed_addr constant
+// CHECK-LATE: @_ZTS6Test3b = linkonce_odr constant
+// CHECK-LATE: @_ZTI6Test3b = linkonce_odr unnamed_addr constant
+
+// This defines the key function.
+inline void Test3b::foo() {}
+
+/*** Test3c ******************************************************************/
+
+struct Test3c {
+ Test3c();
+ virtual void foo();
+ virtual void bar();
+};
+
+// This defines the key function.
+inline void Test3c::bar() {}
+inline void Test3c::foo() {}
+
+// V-table should be defined with weak linkage.
+Test3c::Test3c() { use(typeid(Test3c)); }
+// CHECK: @_ZTV6Test3c = linkonce_odr unnamed_addr constant
+// CHECK: @_ZTS6Test3c = linkonce_odr constant
+// CHECK: @_ZTI6Test3c = linkonce_odr unnamed_addr constant
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