CGCXX.cpp revision 771c678c04f5f685b4f188ec6c2fd88ad0f7457f
1daaf1de7c5f975b77798c551aaefeb36349e5ca7Devang Patel//===--- CGCXX.cpp - Emit LLVM Code for declarations ----------------------===// 2e1b29efab32d02e114046d33cca242a88585bf8aAnders Carlsson// 3e1b29efab32d02e114046d33cca242a88585bf8aAnders Carlsson// The LLVM Compiler Infrastructure 4e1b29efab32d02e114046d33cca242a88585bf8aAnders Carlsson// 5e1b29efab32d02e114046d33cca242a88585bf8aAnders Carlsson// This file is distributed under the University of Illinois Open Source 6e1b29efab32d02e114046d33cca242a88585bf8aAnders Carlsson// License. See LICENSE.TXT for details. 7e1b29efab32d02e114046d33cca242a88585bf8aAnders Carlsson// 8e1b29efab32d02e114046d33cca242a88585bf8aAnders Carlsson//===----------------------------------------------------------------------===// 9e1b29efab32d02e114046d33cca242a88585bf8aAnders Carlsson// 10e1b29efab32d02e114046d33cca242a88585bf8aAnders Carlsson// This contains code dealing with C++ code generation. 11e1b29efab32d02e114046d33cca242a88585bf8aAnders Carlsson// 12e1b29efab32d02e114046d33cca242a88585bf8aAnders Carlsson//===----------------------------------------------------------------------===// 13e1b29efab32d02e114046d33cca242a88585bf8aAnders Carlsson 141eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump// We might split this into multiple files if it gets too unwieldy 15e1b29efab32d02e114046d33cca242a88585bf8aAnders Carlsson 163a811f1f4286ee3fd0c563c1cfe623956f3caa24Charles Davis#include "CGCXXABI.h" 17e1b29efab32d02e114046d33cca242a88585bf8aAnders Carlsson#include "CodeGenFunction.h" 18e1b29efab32d02e114046d33cca242a88585bf8aAnders Carlsson#include "CodeGenModule.h" 19e1b29efab32d02e114046d33cca242a88585bf8aAnders Carlsson#include "clang/AST/ASTContext.h" 20742cd1b7bb86b52b23b335d47abbd842dac0e1bfFariborz Jahanian#include "clang/AST/RecordLayout.h" 21e1b29efab32d02e114046d33cca242a88585bf8aAnders Carlsson#include "clang/AST/Decl.h" 22774e7c6881ee6cb970cd42239d700dce87ed402aAnders Carlsson#include "clang/AST/DeclCXX.h" 2386e9644199d91a33d0090395395bc718bd3a4981Anders Carlsson#include "clang/AST/DeclObjC.h" 2414110477887e3dc168ffc6c191e72d705051f99ePeter Collingbourne#include "clang/AST/Mangle.h" 256815e941998659a55c20c147861b0f437928c3d8Anders Carlsson#include "clang/AST/StmtCXX.h" 2606057cef0bcd7804e80f3ce2bbe352178396c715Chandler Carruth#include "clang/Frontend/CodeGenOptions.h" 27e1b29efab32d02e114046d33cca242a88585bf8aAnders Carlsson#include "llvm/ADT/StringExtras.h" 28e1b29efab32d02e114046d33cca242a88585bf8aAnders Carlssonusing namespace clang; 29e1b29efab32d02e114046d33cca242a88585bf8aAnders Carlssonusing namespace CodeGen; 30e1b29efab32d02e114046d33cca242a88585bf8aAnders Carlsson 31c0bf462cf35fe050bddbd8bff967298e4a67e79dJohn McCall/// Determines whether the given function has a trivial body that does 32c0bf462cf35fe050bddbd8bff967298e4a67e79dJohn McCall/// not require any specific codegen. 33c0bf462cf35fe050bddbd8bff967298e4a67e79dJohn McCallstatic bool HasTrivialBody(const FunctionDecl *FD) { 34c0bf462cf35fe050bddbd8bff967298e4a67e79dJohn McCall Stmt *S = FD->getBody(); 35c0bf462cf35fe050bddbd8bff967298e4a67e79dJohn McCall if (!S) 36c0bf462cf35fe050bddbd8bff967298e4a67e79dJohn McCall return true; 37c0bf462cf35fe050bddbd8bff967298e4a67e79dJohn McCall if (isa<CompoundStmt>(S) && cast<CompoundStmt>(S)->body_empty()) 38c0bf462cf35fe050bddbd8bff967298e4a67e79dJohn McCall return true; 39c0bf462cf35fe050bddbd8bff967298e4a67e79dJohn McCall return false; 40c0bf462cf35fe050bddbd8bff967298e4a67e79dJohn McCall} 41c0bf462cf35fe050bddbd8bff967298e4a67e79dJohn McCall 42c0bf462cf35fe050bddbd8bff967298e4a67e79dJohn McCall/// Try to emit a base destructor as an alias to its primary 43c0bf462cf35fe050bddbd8bff967298e4a67e79dJohn McCall/// base-class destructor. 44c0bf462cf35fe050bddbd8bff967298e4a67e79dJohn McCallbool CodeGenModule::TryEmitBaseDestructorAsAlias(const CXXDestructorDecl *D) { 45d46f98573ba104eda102dd3224b2dca69f1c6336John McCall if (!getCodeGenOpts().CXXCtorDtorAliases) 46d46f98573ba104eda102dd3224b2dca69f1c6336John McCall return true; 47d46f98573ba104eda102dd3224b2dca69f1c6336John McCall 48c0bf462cf35fe050bddbd8bff967298e4a67e79dJohn McCall // If the destructor doesn't have a trivial body, we have to emit it 49c0bf462cf35fe050bddbd8bff967298e4a67e79dJohn McCall // separately. 50c0bf462cf35fe050bddbd8bff967298e4a67e79dJohn McCall if (!HasTrivialBody(D)) 51c0bf462cf35fe050bddbd8bff967298e4a67e79dJohn McCall return true; 52d46f98573ba104eda102dd3224b2dca69f1c6336John McCall 53c0bf462cf35fe050bddbd8bff967298e4a67e79dJohn McCall const CXXRecordDecl *Class = D->getParent(); 54c0bf462cf35fe050bddbd8bff967298e4a67e79dJohn McCall 55c0bf462cf35fe050bddbd8bff967298e4a67e79dJohn McCall // If we need to manipulate a VTT parameter, give up. 56c0bf462cf35fe050bddbd8bff967298e4a67e79dJohn McCall if (Class->getNumVBases()) { 57c0bf462cf35fe050bddbd8bff967298e4a67e79dJohn McCall // Extra Credit: passing extra parameters is perfectly safe 58c0bf462cf35fe050bddbd8bff967298e4a67e79dJohn McCall // in many calling conventions, so only bail out if the ctor's 59c0bf462cf35fe050bddbd8bff967298e4a67e79dJohn McCall // calling convention is nonstandard. 60c0bf462cf35fe050bddbd8bff967298e4a67e79dJohn McCall return true; 61c0bf462cf35fe050bddbd8bff967298e4a67e79dJohn McCall } 62c0bf462cf35fe050bddbd8bff967298e4a67e79dJohn McCall 63c0bf462cf35fe050bddbd8bff967298e4a67e79dJohn McCall // If any fields have a non-trivial destructor, we have to emit it 64c0bf462cf35fe050bddbd8bff967298e4a67e79dJohn McCall // separately. 65c0bf462cf35fe050bddbd8bff967298e4a67e79dJohn McCall for (CXXRecordDecl::field_iterator I = Class->field_begin(), 66c0bf462cf35fe050bddbd8bff967298e4a67e79dJohn McCall E = Class->field_end(); I != E; ++I) 67c0bf462cf35fe050bddbd8bff967298e4a67e79dJohn McCall if (const RecordType *RT = (*I)->getType()->getAs<RecordType>()) 68c0bf462cf35fe050bddbd8bff967298e4a67e79dJohn McCall if (!cast<CXXRecordDecl>(RT->getDecl())->hasTrivialDestructor()) 69c0bf462cf35fe050bddbd8bff967298e4a67e79dJohn McCall return true; 70c0bf462cf35fe050bddbd8bff967298e4a67e79dJohn McCall 71c0bf462cf35fe050bddbd8bff967298e4a67e79dJohn McCall // Try to find a unique base class with a non-trivial destructor. 72c0bf462cf35fe050bddbd8bff967298e4a67e79dJohn McCall const CXXRecordDecl *UniqueBase = 0; 73c0bf462cf35fe050bddbd8bff967298e4a67e79dJohn McCall for (CXXRecordDecl::base_class_const_iterator I = Class->bases_begin(), 74c0bf462cf35fe050bddbd8bff967298e4a67e79dJohn McCall E = Class->bases_end(); I != E; ++I) { 75c0bf462cf35fe050bddbd8bff967298e4a67e79dJohn McCall 76c0bf462cf35fe050bddbd8bff967298e4a67e79dJohn McCall // We're in the base destructor, so skip virtual bases. 77c0bf462cf35fe050bddbd8bff967298e4a67e79dJohn McCall if (I->isVirtual()) continue; 78c0bf462cf35fe050bddbd8bff967298e4a67e79dJohn McCall 79c0bf462cf35fe050bddbd8bff967298e4a67e79dJohn McCall // Skip base classes with trivial destructors. 80c0bf462cf35fe050bddbd8bff967298e4a67e79dJohn McCall const CXXRecordDecl *Base 81c0bf462cf35fe050bddbd8bff967298e4a67e79dJohn McCall = cast<CXXRecordDecl>(I->getType()->getAs<RecordType>()->getDecl()); 82c0bf462cf35fe050bddbd8bff967298e4a67e79dJohn McCall if (Base->hasTrivialDestructor()) continue; 83c0bf462cf35fe050bddbd8bff967298e4a67e79dJohn McCall 84c0bf462cf35fe050bddbd8bff967298e4a67e79dJohn McCall // If we've already found a base class with a non-trivial 85c0bf462cf35fe050bddbd8bff967298e4a67e79dJohn McCall // destructor, give up. 86c0bf462cf35fe050bddbd8bff967298e4a67e79dJohn McCall if (UniqueBase) return true; 87c0bf462cf35fe050bddbd8bff967298e4a67e79dJohn McCall UniqueBase = Base; 88d46f98573ba104eda102dd3224b2dca69f1c6336John McCall } 89d46f98573ba104eda102dd3224b2dca69f1c6336John McCall 90c0bf462cf35fe050bddbd8bff967298e4a67e79dJohn McCall // If we didn't find any bases with a non-trivial destructor, then 91c0bf462cf35fe050bddbd8bff967298e4a67e79dJohn McCall // the base destructor is actually effectively trivial, which can 92c0bf462cf35fe050bddbd8bff967298e4a67e79dJohn McCall // happen if it was needlessly user-defined or if there are virtual 93c0bf462cf35fe050bddbd8bff967298e4a67e79dJohn McCall // bases with non-trivial destructors. 94c0bf462cf35fe050bddbd8bff967298e4a67e79dJohn McCall if (!UniqueBase) 95c0bf462cf35fe050bddbd8bff967298e4a67e79dJohn McCall return true; 96c0bf462cf35fe050bddbd8bff967298e4a67e79dJohn McCall 979a70846c5ffd5ff5cce60de49cd7b312146bf502John McCall /// If we don't have a definition for the destructor yet, don't 989a70846c5ffd5ff5cce60de49cd7b312146bf502John McCall /// emit. We can't emit aliases to declarations; that's just not 999a70846c5ffd5ff5cce60de49cd7b312146bf502John McCall /// how aliases work. 1001d110e05e0ff48c1c7a483d6b7fd094cdf28316aDouglas Gregor const CXXDestructorDecl *BaseD = UniqueBase->getDestructor(); 10106a54a38be5054c910ffc92db60edab23f9ea105Argyrios Kyrtzidis if (!BaseD->isImplicit() && !BaseD->hasBody()) 1029a70846c5ffd5ff5cce60de49cd7b312146bf502John McCall return true; 1039a70846c5ffd5ff5cce60de49cd7b312146bf502John McCall 104c0bf462cf35fe050bddbd8bff967298e4a67e79dJohn McCall // If the base is at a non-zero offset, give up. 105c0bf462cf35fe050bddbd8bff967298e4a67e79dJohn McCall const ASTRecordLayout &ClassLayout = Context.getASTRecordLayout(Class); 106a14f5979572aa25c03d24750ee4724d2031d4edeAnders Carlsson if (ClassLayout.getBaseClassOffsetInBits(UniqueBase) != 0) 107c0bf462cf35fe050bddbd8bff967298e4a67e79dJohn McCall return true; 108c0bf462cf35fe050bddbd8bff967298e4a67e79dJohn McCall 109c0bf462cf35fe050bddbd8bff967298e4a67e79dJohn McCall return TryEmitDefinitionAsAlias(GlobalDecl(D, Dtor_Base), 110c0bf462cf35fe050bddbd8bff967298e4a67e79dJohn McCall GlobalDecl(BaseD, Dtor_Base)); 111c0bf462cf35fe050bddbd8bff967298e4a67e79dJohn McCall} 112c0bf462cf35fe050bddbd8bff967298e4a67e79dJohn McCall 113c0bf462cf35fe050bddbd8bff967298e4a67e79dJohn McCall/// Try to emit a definition as a global alias for another definition. 114c0bf462cf35fe050bddbd8bff967298e4a67e79dJohn McCallbool CodeGenModule::TryEmitDefinitionAsAlias(GlobalDecl AliasDecl, 115c0bf462cf35fe050bddbd8bff967298e4a67e79dJohn McCall GlobalDecl TargetDecl) { 116c0bf462cf35fe050bddbd8bff967298e4a67e79dJohn McCall if (!getCodeGenOpts().CXXCtorDtorAliases) 117c0bf462cf35fe050bddbd8bff967298e4a67e79dJohn McCall return true; 118c0bf462cf35fe050bddbd8bff967298e4a67e79dJohn McCall 119d46f98573ba104eda102dd3224b2dca69f1c6336John McCall // The alias will use the linkage of the referrent. If we can't 120d46f98573ba104eda102dd3224b2dca69f1c6336John McCall // support aliases with that linkage, fail. 121d46f98573ba104eda102dd3224b2dca69f1c6336John McCall llvm::GlobalValue::LinkageTypes Linkage 122d46f98573ba104eda102dd3224b2dca69f1c6336John McCall = getFunctionLinkage(cast<FunctionDecl>(AliasDecl.getDecl())); 123d46f98573ba104eda102dd3224b2dca69f1c6336John McCall 124d46f98573ba104eda102dd3224b2dca69f1c6336John McCall switch (Linkage) { 125d46f98573ba104eda102dd3224b2dca69f1c6336John McCall // We can definitely emit aliases to definitions with external linkage. 126d46f98573ba104eda102dd3224b2dca69f1c6336John McCall case llvm::GlobalValue::ExternalLinkage: 127d46f98573ba104eda102dd3224b2dca69f1c6336John McCall case llvm::GlobalValue::ExternalWeakLinkage: 128d46f98573ba104eda102dd3224b2dca69f1c6336John McCall break; 129d46f98573ba104eda102dd3224b2dca69f1c6336John McCall 130d46f98573ba104eda102dd3224b2dca69f1c6336John McCall // Same with local linkage. 131d46f98573ba104eda102dd3224b2dca69f1c6336John McCall case llvm::GlobalValue::InternalLinkage: 132d46f98573ba104eda102dd3224b2dca69f1c6336John McCall case llvm::GlobalValue::PrivateLinkage: 133d46f98573ba104eda102dd3224b2dca69f1c6336John McCall case llvm::GlobalValue::LinkerPrivateLinkage: 134d46f98573ba104eda102dd3224b2dca69f1c6336John McCall break; 135d46f98573ba104eda102dd3224b2dca69f1c6336John McCall 136d46f98573ba104eda102dd3224b2dca69f1c6336John McCall // We should try to support linkonce linkages. 137d46f98573ba104eda102dd3224b2dca69f1c6336John McCall case llvm::GlobalValue::LinkOnceAnyLinkage: 138d46f98573ba104eda102dd3224b2dca69f1c6336John McCall case llvm::GlobalValue::LinkOnceODRLinkage: 139d46f98573ba104eda102dd3224b2dca69f1c6336John McCall return true; 140d46f98573ba104eda102dd3224b2dca69f1c6336John McCall 141d46f98573ba104eda102dd3224b2dca69f1c6336John McCall // Other linkages will probably never be supported. 142d46f98573ba104eda102dd3224b2dca69f1c6336John McCall default: 143d46f98573ba104eda102dd3224b2dca69f1c6336John McCall return true; 144d46f98573ba104eda102dd3224b2dca69f1c6336John McCall } 145d46f98573ba104eda102dd3224b2dca69f1c6336John McCall 146bc6afd158cc67b5f87dcc2d8efe2a2254af8debeRafael Espindola llvm::GlobalValue::LinkageTypes TargetLinkage 147bc6afd158cc67b5f87dcc2d8efe2a2254af8debeRafael Espindola = getFunctionLinkage(cast<FunctionDecl>(TargetDecl.getDecl())); 148bc6afd158cc67b5f87dcc2d8efe2a2254af8debeRafael Espindola 1493c15745b4baaa0c075418cfbe9f1be19c3a59c45Rafael Espindola if (llvm::GlobalValue::isWeakForLinker(TargetLinkage)) 150bc6afd158cc67b5f87dcc2d8efe2a2254af8debeRafael Espindola return true; 151bc6afd158cc67b5f87dcc2d8efe2a2254af8debeRafael Espindola 152c0bf462cf35fe050bddbd8bff967298e4a67e79dJohn McCall // Derive the type for the alias. 153c0bf462cf35fe050bddbd8bff967298e4a67e79dJohn McCall const llvm::PointerType *AliasType 154c0bf462cf35fe050bddbd8bff967298e4a67e79dJohn McCall = getTypes().GetFunctionType(AliasDecl)->getPointerTo(); 155c0bf462cf35fe050bddbd8bff967298e4a67e79dJohn McCall 156c0bf462cf35fe050bddbd8bff967298e4a67e79dJohn McCall // Find the referrent. Some aliases might require a bitcast, in 157c0bf462cf35fe050bddbd8bff967298e4a67e79dJohn McCall // which case the caller is responsible for ensuring the soundness 158c0bf462cf35fe050bddbd8bff967298e4a67e79dJohn McCall // of these semantics. 159c0bf462cf35fe050bddbd8bff967298e4a67e79dJohn McCall llvm::GlobalValue *Ref = cast<llvm::GlobalValue>(GetAddrOfGlobal(TargetDecl)); 160c0bf462cf35fe050bddbd8bff967298e4a67e79dJohn McCall llvm::Constant *Aliasee = Ref; 161c0bf462cf35fe050bddbd8bff967298e4a67e79dJohn McCall if (Ref->getType() != AliasType) 162c0bf462cf35fe050bddbd8bff967298e4a67e79dJohn McCall Aliasee = llvm::ConstantExpr::getBitCast(Ref, AliasType); 163c0bf462cf35fe050bddbd8bff967298e4a67e79dJohn McCall 164d46f98573ba104eda102dd3224b2dca69f1c6336John McCall // Create the alias with no name. 165d46f98573ba104eda102dd3224b2dca69f1c6336John McCall llvm::GlobalAlias *Alias = 166c0bf462cf35fe050bddbd8bff967298e4a67e79dJohn McCall new llvm::GlobalAlias(AliasType, Linkage, "", Aliasee, &getModule()); 167d46f98573ba104eda102dd3224b2dca69f1c6336John McCall 1681962beee04d3635b12cf6254a53b40ec6c50098dJohn McCall // Switch any previous uses to the alias. 1699a20d55807cc2f6534a9c51a46cc8143ed16786dAnders Carlsson llvm::StringRef MangledName = getMangledName(AliasDecl); 170f746aa6a8f538be914173a4aef2d9a2fd9f99d17John McCall llvm::GlobalValue *Entry = GetGlobalValue(MangledName); 171d46f98573ba104eda102dd3224b2dca69f1c6336John McCall if (Entry) { 1721962beee04d3635b12cf6254a53b40ec6c50098dJohn McCall assert(Entry->isDeclaration() && "definition already exists for alias"); 1731962beee04d3635b12cf6254a53b40ec6c50098dJohn McCall assert(Entry->getType() == AliasType && 1741962beee04d3635b12cf6254a53b40ec6c50098dJohn McCall "declaration exists with different type"); 175f746aa6a8f538be914173a4aef2d9a2fd9f99d17John McCall Alias->takeName(Entry); 176d46f98573ba104eda102dd3224b2dca69f1c6336John McCall Entry->replaceAllUsesWith(Alias); 177d46f98573ba104eda102dd3224b2dca69f1c6336John McCall Entry->eraseFromParent(); 178f746aa6a8f538be914173a4aef2d9a2fd9f99d17John McCall } else { 1799a20d55807cc2f6534a9c51a46cc8143ed16786dAnders Carlsson Alias->setName(MangledName); 180d46f98573ba104eda102dd3224b2dca69f1c6336John McCall } 181d46f98573ba104eda102dd3224b2dca69f1c6336John McCall 182d46f98573ba104eda102dd3224b2dca69f1c6336John McCall // Finally, set up the alias with its proper name and attributes. 1831fb0caaa7bef765b85972274e3b434af2572c141John McCall SetCommonAttributes(cast<NamedDecl>(AliasDecl.getDecl()), Alias); 184d46f98573ba104eda102dd3224b2dca69f1c6336John McCall 185d46f98573ba104eda102dd3224b2dca69f1c6336John McCall return false; 186d46f98573ba104eda102dd3224b2dca69f1c6336John McCall} 187b9de2c55b2a33776e2bee8ee57df7599b374c8a5Anders Carlsson 18895d4e5d2f87a0f07fb143ccb824dfc4c5c595c78Anders Carlssonvoid CodeGenModule::EmitCXXConstructors(const CXXConstructorDecl *D) { 189d46f98573ba104eda102dd3224b2dca69f1c6336John McCall // The constructor used for constructing this as a complete class; 190d46f98573ba104eda102dd3224b2dca69f1c6336John McCall // constucts the virtual bases, then calls the base constructor. 19192ac9ffecd236a6be0d6ab30cef56100e56b171cJohn McCall EmitGlobal(GlobalDecl(D, Ctor_Complete)); 192d46f98573ba104eda102dd3224b2dca69f1c6336John McCall 193d46f98573ba104eda102dd3224b2dca69f1c6336John McCall // The constructor used for constructing this as a base class; 194d46f98573ba104eda102dd3224b2dca69f1c6336John McCall // ignores virtual bases. 1958e51a1f5da6ef4a1a168d14116c6eed3a578a263John McCall EmitGlobal(GlobalDecl(D, Ctor_Base)); 19695d4e5d2f87a0f07fb143ccb824dfc4c5c595c78Anders Carlsson} 197363c184139e26ea38223b477ad64ee67b22bb9a7Anders Carlsson 1981eb4433ac451dc16f4133a88af2d002ac26c58efMike Stumpvoid CodeGenModule::EmitCXXConstructor(const CXXConstructorDecl *D, 19927ae53665f8b00fe4ba21da0fa79a4ce6e0b6cd5Anders Carlsson CXXCtorType Type) { 200d46f98573ba104eda102dd3224b2dca69f1c6336John McCall // The complete constructor is equivalent to the base constructor 201d46f98573ba104eda102dd3224b2dca69f1c6336John McCall // for classes with no virtual bases. Try to emit it as an alias. 202d46f98573ba104eda102dd3224b2dca69f1c6336John McCall if (Type == Ctor_Complete && 203d46f98573ba104eda102dd3224b2dca69f1c6336John McCall !D->getParent()->getNumVBases() && 204d46f98573ba104eda102dd3224b2dca69f1c6336John McCall !TryEmitDefinitionAsAlias(GlobalDecl(D, Ctor_Complete), 205d46f98573ba104eda102dd3224b2dca69f1c6336John McCall GlobalDecl(D, Ctor_Base))) 206d46f98573ba104eda102dd3224b2dca69f1c6336John McCall return; 2071eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 208d46f98573ba104eda102dd3224b2dca69f1c6336John McCall llvm::Function *Fn = cast<llvm::Function>(GetAddrOfCXXConstructor(D, Type)); 2098b2423361648c39a7d8a3c5e8129e12006deac32John McCall setFunctionLinkage(D, Fn); 2101eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2110ff8bafde95f6fa51ccea70738c1b99db870bddcAnders Carlsson CodeGenFunction(*this).GenerateCode(GlobalDecl(D, Type), Fn); 2121eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 21327ae53665f8b00fe4ba21da0fa79a4ce6e0b6cd5Anders Carlsson SetFunctionDefinitionAttributes(D, Fn); 21427ae53665f8b00fe4ba21da0fa79a4ce6e0b6cd5Anders Carlsson SetLLVMFunctionAttributesForDefinition(D, Fn); 21527ae53665f8b00fe4ba21da0fa79a4ce6e0b6cd5Anders Carlsson} 21627ae53665f8b00fe4ba21da0fa79a4ce6e0b6cd5Anders Carlsson 217d46f98573ba104eda102dd3224b2dca69f1c6336John McCallllvm::GlobalValue * 2181eb4433ac451dc16f4133a88af2d002ac26c58efMike StumpCodeGenModule::GetAddrOfCXXConstructor(const CXXConstructorDecl *D, 219363c184139e26ea38223b477ad64ee67b22bb9a7Anders Carlsson CXXCtorType Type) { 220dc709a8aea1072f11080f3a9519fd253582bf973Anders Carlsson GlobalDecl GD(D, Type); 221dc709a8aea1072f11080f3a9519fd253582bf973Anders Carlsson 2229a20d55807cc2f6534a9c51a46cc8143ed16786dAnders Carlsson llvm::StringRef Name = getMangledName(GD); 223f746aa6a8f538be914173a4aef2d9a2fd9f99d17John McCall if (llvm::GlobalValue *V = GetGlobalValue(Name)) 224d46f98573ba104eda102dd3224b2dca69f1c6336John McCall return V; 225d46f98573ba104eda102dd3224b2dca69f1c6336John McCall 22630509a30a9a6ac9ee737e5cf39744a92170d7ea4Fariborz Jahanian const FunctionProtoType *FPT = D->getType()->getAs<FunctionProtoType>(); 227363c184139e26ea38223b477ad64ee67b22bb9a7Anders Carlsson const llvm::FunctionType *FTy = 228f6c56e2323c3f973253805a2f35629f3253ebed4Anders Carlsson getTypes().GetFunctionType(getTypes().getFunctionInfo(D, Type), 22930509a30a9a6ac9ee737e5cf39744a92170d7ea4Fariborz Jahanian FPT->isVariadic()); 23001de7a44cea9f77cbcda65faad8edc8b48a3b617Rafael Espindola return cast<llvm::Function>(GetOrCreateLLVMFunction(Name, FTy, GD)); 231363c184139e26ea38223b477ad64ee67b22bb9a7Anders Carlsson} 23227ae53665f8b00fe4ba21da0fa79a4ce6e0b6cd5Anders Carlsson 23327ae53665f8b00fe4ba21da0fa79a4ce6e0b6cd5Anders Carlssonvoid CodeGenModule::EmitCXXDestructors(const CXXDestructorDecl *D) { 234d46f98573ba104eda102dd3224b2dca69f1c6336John McCall // The destructor in a virtual table is always a 'deleting' 235d46f98573ba104eda102dd3224b2dca69f1c6336John McCall // destructor, which calls the complete destructor and then uses the 236d46f98573ba104eda102dd3224b2dca69f1c6336John McCall // appropriate operator delete. 237ea9a20834cf9311fdf758cfbd73b8daa8e655f15Eli Friedman if (D->isVirtual()) 238624c7d704dc9f1dbb5dd3e5a0ef7eacfb3b699e2Eli Friedman EmitGlobal(GlobalDecl(D, Dtor_Deleting)); 239d46f98573ba104eda102dd3224b2dca69f1c6336John McCall 240d46f98573ba104eda102dd3224b2dca69f1c6336John McCall // The destructor used for destructing this as a most-derived class; 241d46f98573ba104eda102dd3224b2dca69f1c6336John McCall // call the base destructor and then destructs any virtual bases. 2428e51a1f5da6ef4a1a168d14116c6eed3a578a263John McCall EmitGlobal(GlobalDecl(D, Dtor_Complete)); 243d46f98573ba104eda102dd3224b2dca69f1c6336John McCall 244d46f98573ba104eda102dd3224b2dca69f1c6336John McCall // The destructor used for destructing this as a base class; ignores 245d46f98573ba104eda102dd3224b2dca69f1c6336John McCall // virtual bases. 2468e51a1f5da6ef4a1a168d14116c6eed3a578a263John McCall EmitGlobal(GlobalDecl(D, Dtor_Base)); 24727ae53665f8b00fe4ba21da0fa79a4ce6e0b6cd5Anders Carlsson} 24827ae53665f8b00fe4ba21da0fa79a4ce6e0b6cd5Anders Carlsson 2491eb4433ac451dc16f4133a88af2d002ac26c58efMike Stumpvoid CodeGenModule::EmitCXXDestructor(const CXXDestructorDecl *D, 25027ae53665f8b00fe4ba21da0fa79a4ce6e0b6cd5Anders Carlsson CXXDtorType Type) { 251d46f98573ba104eda102dd3224b2dca69f1c6336John McCall // The complete destructor is equivalent to the base destructor for 252d46f98573ba104eda102dd3224b2dca69f1c6336John McCall // classes with no virtual bases, so try to emit it as an alias. 253d46f98573ba104eda102dd3224b2dca69f1c6336John McCall if (Type == Dtor_Complete && 254d46f98573ba104eda102dd3224b2dca69f1c6336John McCall !D->getParent()->getNumVBases() && 255d46f98573ba104eda102dd3224b2dca69f1c6336John McCall !TryEmitDefinitionAsAlias(GlobalDecl(D, Dtor_Complete), 256d46f98573ba104eda102dd3224b2dca69f1c6336John McCall GlobalDecl(D, Dtor_Base))) 257d46f98573ba104eda102dd3224b2dca69f1c6336John McCall return; 258d46f98573ba104eda102dd3224b2dca69f1c6336John McCall 259c0bf462cf35fe050bddbd8bff967298e4a67e79dJohn McCall // The base destructor is equivalent to the base destructor of its 260c0bf462cf35fe050bddbd8bff967298e4a67e79dJohn McCall // base class if there is exactly one non-virtual base class with a 261c0bf462cf35fe050bddbd8bff967298e4a67e79dJohn McCall // non-trivial destructor, there are no fields with a non-trivial 262c0bf462cf35fe050bddbd8bff967298e4a67e79dJohn McCall // destructor, and the body of the destructor is trivial. 263c0bf462cf35fe050bddbd8bff967298e4a67e79dJohn McCall if (Type == Dtor_Base && !TryEmitBaseDestructorAsAlias(D)) 264c0bf462cf35fe050bddbd8bff967298e4a67e79dJohn McCall return; 265c0bf462cf35fe050bddbd8bff967298e4a67e79dJohn McCall 266d46f98573ba104eda102dd3224b2dca69f1c6336John McCall llvm::Function *Fn = cast<llvm::Function>(GetAddrOfCXXDestructor(D, Type)); 2678b2423361648c39a7d8a3c5e8129e12006deac32John McCall setFunctionLinkage(D, Fn); 2681eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2690ff8bafde95f6fa51ccea70738c1b99db870bddcAnders Carlsson CodeGenFunction(*this).GenerateCode(GlobalDecl(D, Type), Fn); 2701eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 27127ae53665f8b00fe4ba21da0fa79a4ce6e0b6cd5Anders Carlsson SetFunctionDefinitionAttributes(D, Fn); 27227ae53665f8b00fe4ba21da0fa79a4ce6e0b6cd5Anders Carlsson SetLLVMFunctionAttributesForDefinition(D, Fn); 27327ae53665f8b00fe4ba21da0fa79a4ce6e0b6cd5Anders Carlsson} 27427ae53665f8b00fe4ba21da0fa79a4ce6e0b6cd5Anders Carlsson 275d46f98573ba104eda102dd3224b2dca69f1c6336John McCallllvm::GlobalValue * 2761eb4433ac451dc16f4133a88af2d002ac26c58efMike StumpCodeGenModule::GetAddrOfCXXDestructor(const CXXDestructorDecl *D, 27727ae53665f8b00fe4ba21da0fa79a4ce6e0b6cd5Anders Carlsson CXXDtorType Type) { 278dc709a8aea1072f11080f3a9519fd253582bf973Anders Carlsson GlobalDecl GD(D, Type); 279dc709a8aea1072f11080f3a9519fd253582bf973Anders Carlsson 2809a20d55807cc2f6534a9c51a46cc8143ed16786dAnders Carlsson llvm::StringRef Name = getMangledName(GD); 281f746aa6a8f538be914173a4aef2d9a2fd9f99d17John McCall if (llvm::GlobalValue *V = GetGlobalValue(Name)) 282d46f98573ba104eda102dd3224b2dca69f1c6336John McCall return V; 283d46f98573ba104eda102dd3224b2dca69f1c6336John McCall 28427ae53665f8b00fe4ba21da0fa79a4ce6e0b6cd5Anders Carlsson const llvm::FunctionType *FTy = 285f6c56e2323c3f973253805a2f35629f3253ebed4Anders Carlsson getTypes().GetFunctionType(getTypes().getFunctionInfo(D, Type), false); 2861eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 28701de7a44cea9f77cbcda65faad8edc8b48a3b617Rafael Espindola return cast<llvm::Function>(GetOrCreateLLVMFunction(Name, FTy, GD)); 28827ae53665f8b00fe4ba21da0fa79a4ce6e0b6cd5Anders Carlsson} 28927ae53665f8b00fe4ba21da0fa79a4ce6e0b6cd5Anders Carlsson 290046c294a43024874ff35656c6e785b64e72f1f36Anders Carlssonstatic llvm::Value *BuildVirtualCall(CodeGenFunction &CGF, uint64_t VTableIndex, 291566abee1e9828a7700b51e4d17ea08234fde3bb4Anders Carlsson llvm::Value *This, const llvm::Type *Ty) { 292043fb9a1fc0609285f60f0f87e5a18195408f34cDan Gohman Ty = Ty->getPointerTo()->getPointerTo(); 293566abee1e9828a7700b51e4d17ea08234fde3bb4Anders Carlsson 294043fb9a1fc0609285f60f0f87e5a18195408f34cDan Gohman llvm::Value *VTable = CGF.GetVTablePtr(This, Ty); 295566abee1e9828a7700b51e4d17ea08234fde3bb4Anders Carlsson llvm::Value *VFuncPtr = 296046c294a43024874ff35656c6e785b64e72f1f36Anders Carlsson CGF.Builder.CreateConstInBoundsGEP1_64(VTable, VTableIndex, "vfn"); 297566abee1e9828a7700b51e4d17ea08234fde3bb4Anders Carlsson return CGF.Builder.CreateLoad(VFuncPtr); 298566abee1e9828a7700b51e4d17ea08234fde3bb4Anders Carlsson} 299566abee1e9828a7700b51e4d17ea08234fde3bb4Anders Carlsson 3002f1986b557fa671c4f8c9dd0d071398edfc073d5Anders Carlssonllvm::Value * 301566abee1e9828a7700b51e4d17ea08234fde3bb4Anders CarlssonCodeGenFunction::BuildVirtualCall(const CXXMethodDecl *MD, llvm::Value *This, 302f0070dbae9535836ad41711081465dec2259786bMike Stump const llvm::Type *Ty) { 303566abee1e9828a7700b51e4d17ea08234fde3bb4Anders Carlsson MD = MD->getCanonicalDecl(); 304046c294a43024874ff35656c6e785b64e72f1f36Anders Carlsson uint64_t VTableIndex = CGM.getVTables().getMethodVTableIndex(MD); 3052b3583573ba6b26b605aacaad9a50492fb3d6fe6Anders Carlsson 306af4403545a50a60d208e6fcae057308d576a92e0Anders Carlsson return ::BuildVirtualCall(*this, VTableIndex, This, Ty); 307566abee1e9828a7700b51e4d17ea08234fde3bb4Anders Carlsson} 308566abee1e9828a7700b51e4d17ea08234fde3bb4Anders Carlsson 3092726267f094a0c1f5ac5b501ec5a9898c58876bfFariborz Jahanian/// BuildVirtualCall - This routine is to support gcc's kext ABI making 3102726267f094a0c1f5ac5b501ec5a9898c58876bfFariborz Jahanian/// indirect call to virtual functions. It makes the call through indexing 3112726267f094a0c1f5ac5b501ec5a9898c58876bfFariborz Jahanian/// into the vtable. 3122726267f094a0c1f5ac5b501ec5a9898c58876bfFariborz Jahanianllvm::Value * 3132726267f094a0c1f5ac5b501ec5a9898c58876bfFariborz JahanianCodeGenFunction::BuildAppleKextVirtualCall(const CXXMethodDecl *MD, 3142726267f094a0c1f5ac5b501ec5a9898c58876bfFariborz Jahanian NestedNameSpecifier *Qual, 3152726267f094a0c1f5ac5b501ec5a9898c58876bfFariborz Jahanian const llvm::Type *Ty) { 3162726267f094a0c1f5ac5b501ec5a9898c58876bfFariborz Jahanian llvm::Value *VTable = 0; 3172726267f094a0c1f5ac5b501ec5a9898c58876bfFariborz Jahanian assert((Qual->getKind() == NestedNameSpecifier::TypeSpec) && 3182726267f094a0c1f5ac5b501ec5a9898c58876bfFariborz Jahanian "BuildAppleKextVirtualCall - bad Qual kind"); 3192726267f094a0c1f5ac5b501ec5a9898c58876bfFariborz Jahanian 3202726267f094a0c1f5ac5b501ec5a9898c58876bfFariborz Jahanian const Type *QTy = Qual->getAsType(); 3212726267f094a0c1f5ac5b501ec5a9898c58876bfFariborz Jahanian QualType T = QualType(QTy, 0); 3222726267f094a0c1f5ac5b501ec5a9898c58876bfFariborz Jahanian const RecordType *RT = T->getAs<RecordType>(); 3232726267f094a0c1f5ac5b501ec5a9898c58876bfFariborz Jahanian assert(RT && "BuildAppleKextVirtualCall - Qual type must be record"); 3242726267f094a0c1f5ac5b501ec5a9898c58876bfFariborz Jahanian const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 325ccd5259d33cbbdd6f5fbf7ccab4cb4a2702309eaFariborz Jahanian 326ccd5259d33cbbdd6f5fbf7ccab4cb4a2702309eaFariborz Jahanian if (const CXXDestructorDecl *DD = dyn_cast<CXXDestructorDecl>(MD)) 327ccd5259d33cbbdd6f5fbf7ccab4cb4a2702309eaFariborz Jahanian return BuildAppleKextVirtualDestructorCall(DD, Dtor_Complete, RD); 328ccd5259d33cbbdd6f5fbf7ccab4cb4a2702309eaFariborz Jahanian 3292726267f094a0c1f5ac5b501ec5a9898c58876bfFariborz Jahanian VTable = CGM.getVTables().GetAddrOfVTable(RD); 3302726267f094a0c1f5ac5b501ec5a9898c58876bfFariborz Jahanian Ty = Ty->getPointerTo()->getPointerTo(); 3312726267f094a0c1f5ac5b501ec5a9898c58876bfFariborz Jahanian VTable = Builder.CreateBitCast(VTable, Ty); 3322726267f094a0c1f5ac5b501ec5a9898c58876bfFariborz Jahanian assert(VTable && "BuildVirtualCall = kext vtbl pointer is null"); 3332726267f094a0c1f5ac5b501ec5a9898c58876bfFariborz Jahanian MD = MD->getCanonicalDecl(); 3342726267f094a0c1f5ac5b501ec5a9898c58876bfFariborz Jahanian uint64_t VTableIndex = CGM.getVTables().getMethodVTableIndex(MD); 335a50e33eb0ff7b73d44aebce88de3732583a7e960Fariborz Jahanian uint64_t AddressPoint = 336a50e33eb0ff7b73d44aebce88de3732583a7e960Fariborz Jahanian CGM.getVTables().getAddressPoint(BaseSubobject(RD, 0), RD); 337a50e33eb0ff7b73d44aebce88de3732583a7e960Fariborz Jahanian VTableIndex += AddressPoint; 3382726267f094a0c1f5ac5b501ec5a9898c58876bfFariborz Jahanian llvm::Value *VFuncPtr = 3392726267f094a0c1f5ac5b501ec5a9898c58876bfFariborz Jahanian CGF.Builder.CreateConstInBoundsGEP1_64(VTable, VTableIndex, "vfnkxt"); 3402726267f094a0c1f5ac5b501ec5a9898c58876bfFariborz Jahanian return CGF.Builder.CreateLoad(VFuncPtr); 3412726267f094a0c1f5ac5b501ec5a9898c58876bfFariborz Jahanian} 3422726267f094a0c1f5ac5b501ec5a9898c58876bfFariborz Jahanian 343ccd5259d33cbbdd6f5fbf7ccab4cb4a2702309eaFariborz Jahanian/// BuildVirtualCall - This routine makes indirect vtable call for 344ccd5259d33cbbdd6f5fbf7ccab4cb4a2702309eaFariborz Jahanian/// call to virtual destructors. It returns 0 if it could not do it. 345ccd5259d33cbbdd6f5fbf7ccab4cb4a2702309eaFariborz Jahanianllvm::Value * 346ccd5259d33cbbdd6f5fbf7ccab4cb4a2702309eaFariborz JahanianCodeGenFunction::BuildAppleKextVirtualDestructorCall( 347ccd5259d33cbbdd6f5fbf7ccab4cb4a2702309eaFariborz Jahanian const CXXDestructorDecl *DD, 348ccd5259d33cbbdd6f5fbf7ccab4cb4a2702309eaFariborz Jahanian CXXDtorType Type, 349ccd5259d33cbbdd6f5fbf7ccab4cb4a2702309eaFariborz Jahanian const CXXRecordDecl *RD) { 350ccd5259d33cbbdd6f5fbf7ccab4cb4a2702309eaFariborz Jahanian llvm::Value * Callee = 0; 351ccd5259d33cbbdd6f5fbf7ccab4cb4a2702309eaFariborz Jahanian const CXXMethodDecl *MD = cast<CXXMethodDecl>(DD); 352ccd5259d33cbbdd6f5fbf7ccab4cb4a2702309eaFariborz Jahanian // FIXME. Dtor_Base dtor is always direct!! 353ccd5259d33cbbdd6f5fbf7ccab4cb4a2702309eaFariborz Jahanian // It need be somehow inline expanded into the caller. 354ccd5259d33cbbdd6f5fbf7ccab4cb4a2702309eaFariborz Jahanian // -O does that. But need to support -O0 as well. 355ccd5259d33cbbdd6f5fbf7ccab4cb4a2702309eaFariborz Jahanian if (MD->isVirtual() && Type != Dtor_Base) { 356ccd5259d33cbbdd6f5fbf7ccab4cb4a2702309eaFariborz Jahanian // Compute the function type we're calling. 357ccd5259d33cbbdd6f5fbf7ccab4cb4a2702309eaFariborz Jahanian const CGFunctionInfo *FInfo = 358ccd5259d33cbbdd6f5fbf7ccab4cb4a2702309eaFariborz Jahanian &CGM.getTypes().getFunctionInfo(cast<CXXDestructorDecl>(MD), 359ccd5259d33cbbdd6f5fbf7ccab4cb4a2702309eaFariborz Jahanian Dtor_Complete); 360ccd5259d33cbbdd6f5fbf7ccab4cb4a2702309eaFariborz Jahanian const FunctionProtoType *FPT = MD->getType()->getAs<FunctionProtoType>(); 361ccd5259d33cbbdd6f5fbf7ccab4cb4a2702309eaFariborz Jahanian const llvm::Type *Ty 362ccd5259d33cbbdd6f5fbf7ccab4cb4a2702309eaFariborz Jahanian = CGM.getTypes().GetFunctionType(*FInfo, FPT->isVariadic()); 363771c678c04f5f685b4f188ec6c2fd88ad0f7457fFariborz Jahanian 364ccd5259d33cbbdd6f5fbf7ccab4cb4a2702309eaFariborz Jahanian llvm::Value *VTable = CGM.getVTables().GetAddrOfVTable(RD); 365ccd5259d33cbbdd6f5fbf7ccab4cb4a2702309eaFariborz Jahanian Ty = Ty->getPointerTo()->getPointerTo(); 366ccd5259d33cbbdd6f5fbf7ccab4cb4a2702309eaFariborz Jahanian VTable = Builder.CreateBitCast(VTable, Ty); 367771c678c04f5f685b4f188ec6c2fd88ad0f7457fFariborz Jahanian DD = cast<CXXDestructorDecl>(DD->getCanonicalDecl()); 368ccd5259d33cbbdd6f5fbf7ccab4cb4a2702309eaFariborz Jahanian uint64_t VTableIndex = 369771c678c04f5f685b4f188ec6c2fd88ad0f7457fFariborz Jahanian CGM.getVTables().getMethodVTableIndex(GlobalDecl(DD, Type)); 370ccd5259d33cbbdd6f5fbf7ccab4cb4a2702309eaFariborz Jahanian uint64_t AddressPoint = 371771c678c04f5f685b4f188ec6c2fd88ad0f7457fFariborz Jahanian CGM.getVTables().getAddressPoint(BaseSubobject(RD, 0), RD); 372ccd5259d33cbbdd6f5fbf7ccab4cb4a2702309eaFariborz Jahanian VTableIndex += AddressPoint; 373ccd5259d33cbbdd6f5fbf7ccab4cb4a2702309eaFariborz Jahanian llvm::Value *VFuncPtr = 374771c678c04f5f685b4f188ec6c2fd88ad0f7457fFariborz Jahanian CGF.Builder.CreateConstInBoundsGEP1_64(VTable, VTableIndex, "vfnkxt"); 375ccd5259d33cbbdd6f5fbf7ccab4cb4a2702309eaFariborz Jahanian Callee = CGF.Builder.CreateLoad(VFuncPtr); 376ccd5259d33cbbdd6f5fbf7ccab4cb4a2702309eaFariborz Jahanian } 377ccd5259d33cbbdd6f5fbf7ccab4cb4a2702309eaFariborz Jahanian return Callee; 378ccd5259d33cbbdd6f5fbf7ccab4cb4a2702309eaFariborz Jahanian} 379ccd5259d33cbbdd6f5fbf7ccab4cb4a2702309eaFariborz Jahanian 380566abee1e9828a7700b51e4d17ea08234fde3bb4Anders Carlssonllvm::Value * 381566abee1e9828a7700b51e4d17ea08234fde3bb4Anders CarlssonCodeGenFunction::BuildVirtualCall(const CXXDestructorDecl *DD, CXXDtorType Type, 38283eedd9fa800c273647c7a90465ea9c110f9d93cAnders Carlsson llvm::Value *This, const llvm::Type *Ty) { 383566abee1e9828a7700b51e4d17ea08234fde3bb4Anders Carlsson DD = cast<CXXDestructorDecl>(DD->getCanonicalDecl()); 384af4403545a50a60d208e6fcae057308d576a92e0Anders Carlsson uint64_t VTableIndex = 385046c294a43024874ff35656c6e785b64e72f1f36Anders Carlsson CGM.getVTables().getMethodVTableIndex(GlobalDecl(DD, Type)); 386566abee1e9828a7700b51e4d17ea08234fde3bb4Anders Carlsson 387af4403545a50a60d208e6fcae057308d576a92e0Anders Carlsson return ::BuildVirtualCall(*this, VTableIndex, This, Ty); 388f0070dbae9535836ad41711081465dec2259786bMike Stump} 3893a811f1f4286ee3fd0c563c1cfe623956f3caa24Charles Davis 390