forked from OSchip/llvm-project
632 lines
24 KiB
C++
632 lines
24 KiB
C++
//===--- CGDecl.cpp - Emit LLVM Code for declarations ---------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This contains code dealing with C++ code generation.
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//
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//===----------------------------------------------------------------------===//
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// We might split this into multiple files if it gets too unwieldy
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#include "CodeGenFunction.h"
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#include "CodeGenModule.h"
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#include "Mangle.h"
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#include "clang/AST/ASTContext.h"
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#include "clang/AST/RecordLayout.h"
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#include "clang/AST/Decl.h"
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#include "clang/AST/DeclCXX.h"
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#include "clang/AST/DeclObjC.h"
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#include "clang/AST/StmtCXX.h"
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#include "clang/CodeGen/CodeGenOptions.h"
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#include "llvm/ADT/StringExtras.h"
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using namespace clang;
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using namespace CodeGen;
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/// Determines whether the given function has a trivial body that does
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/// not require any specific codegen.
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static bool HasTrivialBody(const FunctionDecl *FD) {
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Stmt *S = FD->getBody();
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if (!S)
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return true;
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if (isa<CompoundStmt>(S) && cast<CompoundStmt>(S)->body_empty())
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return true;
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return false;
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}
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/// Try to emit a base destructor as an alias to its primary
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/// base-class destructor.
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bool CodeGenModule::TryEmitBaseDestructorAsAlias(const CXXDestructorDecl *D) {
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if (!getCodeGenOpts().CXXCtorDtorAliases)
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return true;
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// If the destructor doesn't have a trivial body, we have to emit it
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// separately.
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if (!HasTrivialBody(D))
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return true;
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const CXXRecordDecl *Class = D->getParent();
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// If we need to manipulate a VTT parameter, give up.
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if (Class->getNumVBases()) {
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// Extra Credit: passing extra parameters is perfectly safe
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// in many calling conventions, so only bail out if the ctor's
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// calling convention is nonstandard.
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return true;
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}
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// If any fields have a non-trivial destructor, we have to emit it
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// separately.
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for (CXXRecordDecl::field_iterator I = Class->field_begin(),
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E = Class->field_end(); I != E; ++I)
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if (const RecordType *RT = (*I)->getType()->getAs<RecordType>())
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if (!cast<CXXRecordDecl>(RT->getDecl())->hasTrivialDestructor())
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return true;
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// Try to find a unique base class with a non-trivial destructor.
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const CXXRecordDecl *UniqueBase = 0;
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for (CXXRecordDecl::base_class_const_iterator I = Class->bases_begin(),
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E = Class->bases_end(); I != E; ++I) {
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// We're in the base destructor, so skip virtual bases.
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if (I->isVirtual()) continue;
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// Skip base classes with trivial destructors.
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const CXXRecordDecl *Base
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= cast<CXXRecordDecl>(I->getType()->getAs<RecordType>()->getDecl());
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if (Base->hasTrivialDestructor()) continue;
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// If we've already found a base class with a non-trivial
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// destructor, give up.
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if (UniqueBase) return true;
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UniqueBase = Base;
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}
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// If we didn't find any bases with a non-trivial destructor, then
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// the base destructor is actually effectively trivial, which can
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// happen if it was needlessly user-defined or if there are virtual
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// bases with non-trivial destructors.
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if (!UniqueBase)
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return true;
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// If the base is at a non-zero offset, give up.
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const ASTRecordLayout &ClassLayout = Context.getASTRecordLayout(Class);
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if (ClassLayout.getBaseClassOffset(UniqueBase) != 0)
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return true;
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const CXXDestructorDecl *BaseD = UniqueBase->getDestructor(getContext());
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return TryEmitDefinitionAsAlias(GlobalDecl(D, Dtor_Base),
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GlobalDecl(BaseD, Dtor_Base));
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}
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/// Try to emit a definition as a global alias for another definition.
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bool CodeGenModule::TryEmitDefinitionAsAlias(GlobalDecl AliasDecl,
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GlobalDecl TargetDecl) {
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if (!getCodeGenOpts().CXXCtorDtorAliases)
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return true;
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// The alias will use the linkage of the referrent. If we can't
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// support aliases with that linkage, fail.
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llvm::GlobalValue::LinkageTypes Linkage
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= getFunctionLinkage(cast<FunctionDecl>(AliasDecl.getDecl()));
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switch (Linkage) {
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// We can definitely emit aliases to definitions with external linkage.
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case llvm::GlobalValue::ExternalLinkage:
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case llvm::GlobalValue::ExternalWeakLinkage:
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break;
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// Same with local linkage.
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case llvm::GlobalValue::InternalLinkage:
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case llvm::GlobalValue::PrivateLinkage:
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case llvm::GlobalValue::LinkerPrivateLinkage:
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break;
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// We should try to support linkonce linkages.
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case llvm::GlobalValue::LinkOnceAnyLinkage:
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case llvm::GlobalValue::LinkOnceODRLinkage:
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return true;
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// Other linkages will probably never be supported.
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default:
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return true;
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}
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// Derive the type for the alias.
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const llvm::PointerType *AliasType
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= getTypes().GetFunctionType(AliasDecl)->getPointerTo();
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// Find the referrent. Some aliases might require a bitcast, in
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// which case the caller is responsible for ensuring the soundness
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// of these semantics.
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llvm::GlobalValue *Ref = cast<llvm::GlobalValue>(GetAddrOfGlobal(TargetDecl));
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llvm::Constant *Aliasee = Ref;
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if (Ref->getType() != AliasType)
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Aliasee = llvm::ConstantExpr::getBitCast(Ref, AliasType);
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// Create the alias with no name.
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llvm::GlobalAlias *Alias =
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new llvm::GlobalAlias(AliasType, Linkage, "", Aliasee, &getModule());
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// Switch any previous uses to the alias.
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const char *MangledName = getMangledName(AliasDecl);
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llvm::GlobalValue *&Entry = GlobalDeclMap[MangledName];
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if (Entry) {
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assert(Entry->isDeclaration() && "definition already exists for alias");
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assert(Entry->getType() == AliasType &&
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"declaration exists with different type");
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Entry->replaceAllUsesWith(Alias);
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Entry->eraseFromParent();
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}
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Entry = Alias;
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// Finally, set up the alias with its proper name and attributes.
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Alias->setName(MangledName);
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SetCommonAttributes(AliasDecl.getDecl(), Alias);
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return false;
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}
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void CodeGenModule::EmitCXXConstructors(const CXXConstructorDecl *D) {
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// The constructor used for constructing this as a complete class;
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// constucts the virtual bases, then calls the base constructor.
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EmitGlobal(GlobalDecl(D, Ctor_Complete));
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// The constructor used for constructing this as a base class;
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// ignores virtual bases.
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EmitGlobal(GlobalDecl(D, Ctor_Base));
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}
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void CodeGenModule::EmitCXXConstructor(const CXXConstructorDecl *D,
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CXXCtorType Type) {
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// The complete constructor is equivalent to the base constructor
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// for classes with no virtual bases. Try to emit it as an alias.
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if (Type == Ctor_Complete &&
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!D->getParent()->getNumVBases() &&
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!TryEmitDefinitionAsAlias(GlobalDecl(D, Ctor_Complete),
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GlobalDecl(D, Ctor_Base)))
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return;
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llvm::Function *Fn = cast<llvm::Function>(GetAddrOfCXXConstructor(D, Type));
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CodeGenFunction(*this).GenerateCode(GlobalDecl(D, Type), Fn);
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SetFunctionDefinitionAttributes(D, Fn);
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SetLLVMFunctionAttributesForDefinition(D, Fn);
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}
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llvm::GlobalValue *
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CodeGenModule::GetAddrOfCXXConstructor(const CXXConstructorDecl *D,
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CXXCtorType Type) {
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const char *Name = getMangledCXXCtorName(D, Type);
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if (llvm::GlobalValue *V = GlobalDeclMap[Name])
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return V;
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const FunctionProtoType *FPT = D->getType()->getAs<FunctionProtoType>();
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const llvm::FunctionType *FTy =
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getTypes().GetFunctionType(getTypes().getFunctionInfo(D, Type),
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FPT->isVariadic());
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return cast<llvm::Function>(
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GetOrCreateLLVMFunction(Name, FTy, GlobalDecl(D, Type)));
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}
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const char *CodeGenModule::getMangledCXXCtorName(const CXXConstructorDecl *D,
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CXXCtorType Type) {
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llvm::SmallString<256> Name;
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getMangleContext().mangleCXXCtor(D, Type, Name);
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Name += '\0';
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return UniqueMangledName(Name.begin(), Name.end());
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}
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void CodeGenModule::EmitCXXDestructors(const CXXDestructorDecl *D) {
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// The destructor in a virtual table is always a 'deleting'
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// destructor, which calls the complete destructor and then uses the
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// appropriate operator delete.
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if (D->isVirtual())
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EmitGlobal(GlobalDecl(D, Dtor_Deleting));
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// The destructor used for destructing this as a most-derived class;
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// call the base destructor and then destructs any virtual bases.
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EmitGlobal(GlobalDecl(D, Dtor_Complete));
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// The destructor used for destructing this as a base class; ignores
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// virtual bases.
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EmitGlobal(GlobalDecl(D, Dtor_Base));
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}
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void CodeGenModule::EmitCXXDestructor(const CXXDestructorDecl *D,
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CXXDtorType Type) {
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// The complete destructor is equivalent to the base destructor for
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// classes with no virtual bases, so try to emit it as an alias.
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if (Type == Dtor_Complete &&
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!D->getParent()->getNumVBases() &&
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!TryEmitDefinitionAsAlias(GlobalDecl(D, Dtor_Complete),
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GlobalDecl(D, Dtor_Base)))
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return;
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// The base destructor is equivalent to the base destructor of its
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// base class if there is exactly one non-virtual base class with a
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// non-trivial destructor, there are no fields with a non-trivial
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// destructor, and the body of the destructor is trivial.
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if (Type == Dtor_Base && !TryEmitBaseDestructorAsAlias(D))
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return;
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llvm::Function *Fn = cast<llvm::Function>(GetAddrOfCXXDestructor(D, Type));
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CodeGenFunction(*this).GenerateCode(GlobalDecl(D, Type), Fn);
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SetFunctionDefinitionAttributes(D, Fn);
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SetLLVMFunctionAttributesForDefinition(D, Fn);
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}
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llvm::GlobalValue *
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CodeGenModule::GetAddrOfCXXDestructor(const CXXDestructorDecl *D,
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CXXDtorType Type) {
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const char *Name = getMangledCXXDtorName(D, Type);
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if (llvm::GlobalValue *V = GlobalDeclMap[Name])
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return V;
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const llvm::FunctionType *FTy =
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getTypes().GetFunctionType(getTypes().getFunctionInfo(D, Type), false);
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return cast<llvm::Function>(
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GetOrCreateLLVMFunction(Name, FTy, GlobalDecl(D, Type)));
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}
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const char *CodeGenModule::getMangledCXXDtorName(const CXXDestructorDecl *D,
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CXXDtorType Type) {
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llvm::SmallString<256> Name;
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getMangleContext().mangleCXXDtor(D, Type, Name);
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Name += '\0';
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return UniqueMangledName(Name.begin(), Name.end());
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}
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llvm::Constant *
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CodeGenFunction::GenerateThunk(llvm::Function *Fn, GlobalDecl GD,
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bool Extern,
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const ThunkAdjustment &ThisAdjustment) {
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return GenerateCovariantThunk(Fn, GD, Extern,
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CovariantThunkAdjustment(ThisAdjustment,
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ThunkAdjustment()));
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}
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llvm::Value *
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CodeGenFunction::DynamicTypeAdjust(llvm::Value *V,
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const ThunkAdjustment &Adjustment) {
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const llvm::Type *Int8PtrTy = llvm::Type::getInt8PtrTy(VMContext);
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const llvm::Type *OrigTy = V->getType();
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if (Adjustment.NonVirtual) {
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// Do the non-virtual adjustment
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V = Builder.CreateBitCast(V, Int8PtrTy);
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V = Builder.CreateConstInBoundsGEP1_64(V, Adjustment.NonVirtual);
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V = Builder.CreateBitCast(V, OrigTy);
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}
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if (!Adjustment.Virtual)
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return V;
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assert(Adjustment.Virtual % (LLVMPointerWidth / 8) == 0 &&
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"vtable entry unaligned");
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// Do the virtual this adjustment
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const llvm::Type *PtrDiffTy = ConvertType(getContext().getPointerDiffType());
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const llvm::Type *PtrDiffPtrTy = PtrDiffTy->getPointerTo();
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llvm::Value *ThisVal = Builder.CreateBitCast(V, Int8PtrTy);
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V = Builder.CreateBitCast(V, PtrDiffPtrTy->getPointerTo());
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V = Builder.CreateLoad(V, "vtable");
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llvm::Value *VTablePtr = V;
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uint64_t VirtualAdjustment = Adjustment.Virtual / (LLVMPointerWidth / 8);
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V = Builder.CreateConstInBoundsGEP1_64(VTablePtr, VirtualAdjustment);
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V = Builder.CreateLoad(V);
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V = Builder.CreateGEP(ThisVal, V);
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return Builder.CreateBitCast(V, OrigTy);
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}
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llvm::Constant *
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CodeGenFunction::GenerateCovariantThunk(llvm::Function *Fn,
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GlobalDecl GD, bool Extern,
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const CovariantThunkAdjustment &Adjustment) {
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const CXXMethodDecl *MD = cast<CXXMethodDecl>(GD.getDecl());
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const FunctionProtoType *FPT = MD->getType()->getAs<FunctionProtoType>();
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QualType ResultType = FPT->getResultType();
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FunctionArgList Args;
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ImplicitParamDecl *ThisDecl =
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ImplicitParamDecl::Create(getContext(), 0, SourceLocation(), 0,
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MD->getThisType(getContext()));
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Args.push_back(std::make_pair(ThisDecl, ThisDecl->getType()));
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for (FunctionDecl::param_const_iterator i = MD->param_begin(),
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e = MD->param_end();
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i != e; ++i) {
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ParmVarDecl *D = *i;
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Args.push_back(std::make_pair(D, D->getType()));
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}
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IdentifierInfo *II
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= &CGM.getContext().Idents.get("__thunk_named_foo_");
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FunctionDecl *FD = FunctionDecl::Create(getContext(),
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getContext().getTranslationUnitDecl(),
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SourceLocation(), II, ResultType, 0,
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Extern
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? FunctionDecl::Extern
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: FunctionDecl::Static,
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false, true);
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StartFunction(FD, ResultType, Fn, Args, SourceLocation());
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// generate body
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const llvm::Type *Ty =
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CGM.getTypes().GetFunctionType(CGM.getTypes().getFunctionInfo(MD),
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FPT->isVariadic());
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llvm::Value *Callee = CGM.GetAddrOfFunction(GD, Ty);
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CallArgList CallArgs;
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bool ShouldAdjustReturnPointer = true;
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QualType ArgType = MD->getThisType(getContext());
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llvm::Value *Arg = Builder.CreateLoad(LocalDeclMap[ThisDecl], "this");
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if (!Adjustment.ThisAdjustment.isEmpty()) {
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// Do the this adjustment.
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const llvm::Type *OrigTy = Callee->getType();
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Arg = DynamicTypeAdjust(Arg, Adjustment.ThisAdjustment);
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if (!Adjustment.ReturnAdjustment.isEmpty()) {
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const CovariantThunkAdjustment &ReturnAdjustment =
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CovariantThunkAdjustment(ThunkAdjustment(),
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Adjustment.ReturnAdjustment);
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Callee = CGM.BuildCovariantThunk(GD, Extern, ReturnAdjustment);
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Callee = Builder.CreateBitCast(Callee, OrigTy);
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ShouldAdjustReturnPointer = false;
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}
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}
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CallArgs.push_back(std::make_pair(RValue::get(Arg), ArgType));
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for (FunctionDecl::param_const_iterator i = MD->param_begin(),
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e = MD->param_end();
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i != e; ++i) {
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ParmVarDecl *D = *i;
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QualType ArgType = D->getType();
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// llvm::Value *Arg = CGF.GetAddrOfLocalVar(Dst);
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Expr *Arg = new (getContext()) DeclRefExpr(D, ArgType.getNonReferenceType(),
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SourceLocation());
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CallArgs.push_back(std::make_pair(EmitCallArg(Arg, ArgType), ArgType));
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}
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RValue RV = EmitCall(CGM.getTypes().getFunctionInfo(ResultType, CallArgs,
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FPT->getCallConv(),
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FPT->getNoReturnAttr()),
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Callee, ReturnValueSlot(), CallArgs, MD);
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if (ShouldAdjustReturnPointer && !Adjustment.ReturnAdjustment.isEmpty()) {
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bool CanBeZero = !(ResultType->isReferenceType()
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// FIXME: attr nonnull can't be zero either
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/* || ResultType->hasAttr<NonNullAttr>() */ );
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// Do the return result adjustment.
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if (CanBeZero) {
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llvm::BasicBlock *NonZeroBlock = createBasicBlock();
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llvm::BasicBlock *ZeroBlock = createBasicBlock();
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llvm::BasicBlock *ContBlock = createBasicBlock();
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const llvm::Type *Ty = RV.getScalarVal()->getType();
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llvm::Value *Zero = llvm::Constant::getNullValue(Ty);
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Builder.CreateCondBr(Builder.CreateICmpNE(RV.getScalarVal(), Zero),
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NonZeroBlock, ZeroBlock);
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EmitBlock(NonZeroBlock);
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llvm::Value *NZ =
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DynamicTypeAdjust(RV.getScalarVal(), Adjustment.ReturnAdjustment);
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EmitBranch(ContBlock);
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EmitBlock(ZeroBlock);
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llvm::Value *Z = RV.getScalarVal();
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EmitBlock(ContBlock);
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llvm::PHINode *RVOrZero = Builder.CreatePHI(Ty);
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RVOrZero->reserveOperandSpace(2);
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RVOrZero->addIncoming(NZ, NonZeroBlock);
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RVOrZero->addIncoming(Z, ZeroBlock);
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RV = RValue::get(RVOrZero);
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} else
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RV = RValue::get(DynamicTypeAdjust(RV.getScalarVal(),
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Adjustment.ReturnAdjustment));
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}
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if (!ResultType->isVoidType())
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EmitReturnOfRValue(RV, ResultType);
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FinishFunction();
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return Fn;
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}
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llvm::Constant *
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CodeGenModule::GetAddrOfThunk(GlobalDecl GD,
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const ThunkAdjustment &ThisAdjustment) {
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const CXXMethodDecl *MD = cast<CXXMethodDecl>(GD.getDecl());
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// Compute mangled name
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llvm::SmallString<256> OutName;
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if (const CXXDestructorDecl* DD = dyn_cast<CXXDestructorDecl>(MD))
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getMangleContext().mangleCXXDtorThunk(DD, GD.getDtorType(), ThisAdjustment,
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OutName);
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else
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getMangleContext().mangleThunk(MD, ThisAdjustment, OutName);
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OutName += '\0';
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const char* Name = UniqueMangledName(OutName.begin(), OutName.end());
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// Get function for mangled name
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const llvm::Type *Ty = getTypes().GetFunctionTypeForVtable(MD);
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return GetOrCreateLLVMFunction(Name, Ty, GlobalDecl());
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}
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llvm::Constant *
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CodeGenModule::GetAddrOfCovariantThunk(GlobalDecl GD,
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const CovariantThunkAdjustment &Adjustment) {
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const CXXMethodDecl *MD = cast<CXXMethodDecl>(GD.getDecl());
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// Compute mangled name
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llvm::SmallString<256> OutName;
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getMangleContext().mangleCovariantThunk(MD, Adjustment, OutName);
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OutName += '\0';
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const char* Name = UniqueMangledName(OutName.begin(), OutName.end());
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// Get function for mangled name
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const llvm::Type *Ty = getTypes().GetFunctionTypeForVtable(MD);
|
|
return GetOrCreateLLVMFunction(Name, Ty, GlobalDecl());
|
|
}
|
|
|
|
void CodeGenModule::BuildThunksForVirtual(GlobalDecl GD) {
|
|
CGVtableInfo::AdjustmentVectorTy *AdjPtr = getVtableInfo().getAdjustments(GD);
|
|
if (!AdjPtr)
|
|
return;
|
|
CGVtableInfo::AdjustmentVectorTy &Adj = *AdjPtr;
|
|
const CXXMethodDecl *MD = cast<CXXMethodDecl>(GD.getDecl());
|
|
for (unsigned i = 0; i < Adj.size(); i++) {
|
|
GlobalDecl OGD = Adj[i].first;
|
|
const CXXMethodDecl *OMD = cast<CXXMethodDecl>(OGD.getDecl());
|
|
QualType nc_oret = OMD->getType()->getAs<FunctionType>()->getResultType();
|
|
CanQualType oret = getContext().getCanonicalType(nc_oret);
|
|
QualType nc_ret = MD->getType()->getAs<FunctionType>()->getResultType();
|
|
CanQualType ret = getContext().getCanonicalType(nc_ret);
|
|
ThunkAdjustment ReturnAdjustment;
|
|
if (oret != ret) {
|
|
QualType qD = nc_ret->getPointeeType();
|
|
QualType qB = nc_oret->getPointeeType();
|
|
CXXRecordDecl *D = cast<CXXRecordDecl>(qD->getAs<RecordType>()->getDecl());
|
|
CXXRecordDecl *B = cast<CXXRecordDecl>(qB->getAs<RecordType>()->getDecl());
|
|
ReturnAdjustment = ComputeThunkAdjustment(D, B);
|
|
}
|
|
ThunkAdjustment ThisAdjustment = Adj[i].second;
|
|
bool Extern = !cast<CXXRecordDecl>(OMD->getDeclContext())->isInAnonymousNamespace();
|
|
if (!ReturnAdjustment.isEmpty() || !ThisAdjustment.isEmpty()) {
|
|
CovariantThunkAdjustment CoAdj(ThisAdjustment, ReturnAdjustment);
|
|
llvm::Constant *FnConst;
|
|
if (!ReturnAdjustment.isEmpty())
|
|
FnConst = GetAddrOfCovariantThunk(GD, CoAdj);
|
|
else
|
|
FnConst = GetAddrOfThunk(GD, ThisAdjustment);
|
|
if (!isa<llvm::Function>(FnConst)) {
|
|
llvm::Constant *SubExpr =
|
|
cast<llvm::ConstantExpr>(FnConst)->getOperand(0);
|
|
llvm::Function *OldFn = cast<llvm::Function>(SubExpr);
|
|
std::string Name = OldFn->getNameStr();
|
|
GlobalDeclMap.erase(UniqueMangledName(Name.data(),
|
|
Name.data() + Name.size() + 1));
|
|
llvm::Constant *NewFnConst;
|
|
if (!ReturnAdjustment.isEmpty())
|
|
NewFnConst = GetAddrOfCovariantThunk(GD, CoAdj);
|
|
else
|
|
NewFnConst = GetAddrOfThunk(GD, ThisAdjustment);
|
|
llvm::Function *NewFn = cast<llvm::Function>(NewFnConst);
|
|
NewFn->takeName(OldFn);
|
|
llvm::Constant *NewPtrForOldDecl =
|
|
llvm::ConstantExpr::getBitCast(NewFn, OldFn->getType());
|
|
OldFn->replaceAllUsesWith(NewPtrForOldDecl);
|
|
OldFn->eraseFromParent();
|
|
FnConst = NewFn;
|
|
}
|
|
llvm::Function *Fn = cast<llvm::Function>(FnConst);
|
|
if (Fn->isDeclaration()) {
|
|
llvm::GlobalVariable::LinkageTypes linktype;
|
|
linktype = llvm::GlobalValue::WeakAnyLinkage;
|
|
if (!Extern)
|
|
linktype = llvm::GlobalValue::InternalLinkage;
|
|
Fn->setLinkage(linktype);
|
|
if (!Features.Exceptions && !Features.ObjCNonFragileABI)
|
|
Fn->addFnAttr(llvm::Attribute::NoUnwind);
|
|
Fn->setAlignment(2);
|
|
CodeGenFunction(*this).GenerateCovariantThunk(Fn, GD, Extern, CoAdj);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
llvm::Constant *
|
|
CodeGenModule::BuildThunk(GlobalDecl GD, bool Extern,
|
|
const ThunkAdjustment &ThisAdjustment) {
|
|
const CXXMethodDecl *MD = cast<CXXMethodDecl>(GD.getDecl());
|
|
llvm::SmallString<256> OutName;
|
|
if (const CXXDestructorDecl *D = dyn_cast<CXXDestructorDecl>(MD)) {
|
|
getMangleContext().mangleCXXDtorThunk(D, GD.getDtorType(), ThisAdjustment,
|
|
OutName);
|
|
} else
|
|
getMangleContext().mangleThunk(MD, ThisAdjustment, OutName);
|
|
|
|
llvm::GlobalVariable::LinkageTypes linktype;
|
|
linktype = llvm::GlobalValue::WeakAnyLinkage;
|
|
if (!Extern)
|
|
linktype = llvm::GlobalValue::InternalLinkage;
|
|
llvm::Type *Ptr8Ty=llvm::PointerType::get(llvm::Type::getInt8Ty(VMContext),0);
|
|
const FunctionProtoType *FPT = MD->getType()->getAs<FunctionProtoType>();
|
|
const llvm::FunctionType *FTy =
|
|
getTypes().GetFunctionType(getTypes().getFunctionInfo(MD),
|
|
FPT->isVariadic());
|
|
|
|
llvm::Function *Fn = llvm::Function::Create(FTy, linktype, OutName.str(),
|
|
&getModule());
|
|
CodeGenFunction(*this).GenerateThunk(Fn, GD, Extern, ThisAdjustment);
|
|
llvm::Constant *m = llvm::ConstantExpr::getBitCast(Fn, Ptr8Ty);
|
|
return m;
|
|
}
|
|
|
|
llvm::Constant *
|
|
CodeGenModule::BuildCovariantThunk(const GlobalDecl &GD, bool Extern,
|
|
const CovariantThunkAdjustment &Adjustment) {
|
|
const CXXMethodDecl *MD = cast<CXXMethodDecl>(GD.getDecl());
|
|
llvm::SmallString<256> OutName;
|
|
getMangleContext().mangleCovariantThunk(MD, Adjustment, OutName);
|
|
llvm::GlobalVariable::LinkageTypes linktype;
|
|
linktype = llvm::GlobalValue::WeakAnyLinkage;
|
|
if (!Extern)
|
|
linktype = llvm::GlobalValue::InternalLinkage;
|
|
llvm::Type *Ptr8Ty=llvm::PointerType::get(llvm::Type::getInt8Ty(VMContext),0);
|
|
const FunctionProtoType *FPT = MD->getType()->getAs<FunctionProtoType>();
|
|
const llvm::FunctionType *FTy =
|
|
getTypes().GetFunctionType(getTypes().getFunctionInfo(MD),
|
|
FPT->isVariadic());
|
|
|
|
llvm::Function *Fn = llvm::Function::Create(FTy, linktype, OutName.str(),
|
|
&getModule());
|
|
CodeGenFunction(*this).GenerateCovariantThunk(Fn, MD, Extern, Adjustment);
|
|
llvm::Constant *m = llvm::ConstantExpr::getBitCast(Fn, Ptr8Ty);
|
|
return m;
|
|
}
|
|
|
|
static llvm::Value *BuildVirtualCall(CodeGenFunction &CGF, uint64_t VtableIndex,
|
|
llvm::Value *This, const llvm::Type *Ty) {
|
|
Ty = Ty->getPointerTo()->getPointerTo()->getPointerTo();
|
|
|
|
llvm::Value *Vtable = CGF.Builder.CreateBitCast(This, Ty);
|
|
Vtable = CGF.Builder.CreateLoad(Vtable);
|
|
|
|
llvm::Value *VFuncPtr =
|
|
CGF.Builder.CreateConstInBoundsGEP1_64(Vtable, VtableIndex, "vfn");
|
|
return CGF.Builder.CreateLoad(VFuncPtr);
|
|
}
|
|
|
|
llvm::Value *
|
|
CodeGenFunction::BuildVirtualCall(const CXXMethodDecl *MD, llvm::Value *This,
|
|
const llvm::Type *Ty) {
|
|
MD = MD->getCanonicalDecl();
|
|
uint64_t VtableIndex = CGM.getVtableInfo().getMethodVtableIndex(MD);
|
|
|
|
return ::BuildVirtualCall(*this, VtableIndex, This, Ty);
|
|
}
|
|
|
|
llvm::Value *
|
|
CodeGenFunction::BuildVirtualCall(const CXXDestructorDecl *DD, CXXDtorType Type,
|
|
llvm::Value *&This, const llvm::Type *Ty) {
|
|
DD = cast<CXXDestructorDecl>(DD->getCanonicalDecl());
|
|
uint64_t VtableIndex =
|
|
CGM.getVtableInfo().getMethodVtableIndex(GlobalDecl(DD, Type));
|
|
|
|
return ::BuildVirtualCall(*this, VtableIndex, This, Ty);
|
|
}
|