CGCXX.cpp revision c00129a08c829bb34f22dc13727043c994c85644
1e1b29efab32d02e114046d33cca242a88585bf8aAnders Carlsson//===--- CGDecl.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" 19283a062a633d6e868aa2be319da812341fe73728Anders Carlsson#include "Mangle.h" 20e1b29efab32d02e114046d33cca242a88585bf8aAnders Carlsson#include "clang/AST/ASTContext.h" 21742cd1b7bb86b52b23b335d47abbd842dac0e1bfFariborz Jahanian#include "clang/AST/RecordLayout.h" 22e1b29efab32d02e114046d33cca242a88585bf8aAnders Carlsson#include "clang/AST/Decl.h" 23774e7c6881ee6cb970cd42239d700dce87ed402aAnders Carlsson#include "clang/AST/DeclCXX.h" 2486e9644199d91a33d0090395395bc718bd3a4981Anders Carlsson#include "clang/AST/DeclObjC.h" 256815e941998659a55c20c147861b0f437928c3d8Anders Carlsson#include "clang/AST/StmtCXX.h" 26d46f98573ba104eda102dd3224b2dca69f1c6336John McCall#include "clang/CodeGen/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. 1009a70846c5ffd5ff5cce60de49cd7b312146bf502John McCall const CXXDestructorDecl *BaseD = UniqueBase->getDestructor(getContext()); 1019a70846c5ffd5ff5cce60de49cd7b312146bf502John McCall if (!BaseD->isImplicit() && !BaseD->getBody()) 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); 106c0bf462cf35fe050bddbd8bff967298e4a67e79dJohn McCall if (ClassLayout.getBaseClassOffset(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. 169f746aa6a8f538be914173a4aef2d9a2fd9f99d17John McCall MangleBuffer MangledName; 170f746aa6a8f538be914173a4aef2d9a2fd9f99d17John McCall getMangledName(MangledName, AliasDecl); 171f746aa6a8f538be914173a4aef2d9a2fd9f99d17John McCall llvm::GlobalValue *Entry = GetGlobalValue(MangledName); 172d46f98573ba104eda102dd3224b2dca69f1c6336John McCall if (Entry) { 1731962beee04d3635b12cf6254a53b40ec6c50098dJohn McCall assert(Entry->isDeclaration() && "definition already exists for alias"); 1741962beee04d3635b12cf6254a53b40ec6c50098dJohn McCall assert(Entry->getType() == AliasType && 1751962beee04d3635b12cf6254a53b40ec6c50098dJohn McCall "declaration exists with different type"); 176f746aa6a8f538be914173a4aef2d9a2fd9f99d17John McCall Alias->takeName(Entry); 177d46f98573ba104eda102dd3224b2dca69f1c6336John McCall Entry->replaceAllUsesWith(Alias); 178d46f98573ba104eda102dd3224b2dca69f1c6336John McCall Entry->eraseFromParent(); 179f746aa6a8f538be914173a4aef2d9a2fd9f99d17John McCall } else { 180f746aa6a8f538be914173a4aef2d9a2fd9f99d17John McCall Alias->setName(MangledName.getString()); 181d46f98573ba104eda102dd3224b2dca69f1c6336John McCall } 182d46f98573ba104eda102dd3224b2dca69f1c6336John McCall 183d46f98573ba104eda102dd3224b2dca69f1c6336John McCall // Finally, set up the alias with its proper name and attributes. 184d46f98573ba104eda102dd3224b2dca69f1c6336John McCall SetCommonAttributes(AliasDecl.getDecl(), Alias); 185d46f98573ba104eda102dd3224b2dca69f1c6336John McCall 186d46f98573ba104eda102dd3224b2dca69f1c6336John McCall return false; 187d46f98573ba104eda102dd3224b2dca69f1c6336John McCall} 188b9de2c55b2a33776e2bee8ee57df7599b374c8a5Anders Carlsson 18995d4e5d2f87a0f07fb143ccb824dfc4c5c595c78Anders Carlssonvoid CodeGenModule::EmitCXXConstructors(const CXXConstructorDecl *D) { 190d46f98573ba104eda102dd3224b2dca69f1c6336John McCall // The constructor used for constructing this as a complete class; 191d46f98573ba104eda102dd3224b2dca69f1c6336John McCall // constucts the virtual bases, then calls the base constructor. 19292ac9ffecd236a6be0d6ab30cef56100e56b171cJohn McCall EmitGlobal(GlobalDecl(D, Ctor_Complete)); 193d46f98573ba104eda102dd3224b2dca69f1c6336John McCall 194d46f98573ba104eda102dd3224b2dca69f1c6336John McCall // The constructor used for constructing this as a base class; 195d46f98573ba104eda102dd3224b2dca69f1c6336John McCall // ignores virtual bases. 1968e51a1f5da6ef4a1a168d14116c6eed3a578a263John McCall EmitGlobal(GlobalDecl(D, Ctor_Base)); 19795d4e5d2f87a0f07fb143ccb824dfc4c5c595c78Anders Carlsson} 198363c184139e26ea38223b477ad64ee67b22bb9a7Anders Carlsson 1991eb4433ac451dc16f4133a88af2d002ac26c58efMike Stumpvoid CodeGenModule::EmitCXXConstructor(const CXXConstructorDecl *D, 20027ae53665f8b00fe4ba21da0fa79a4ce6e0b6cd5Anders Carlsson CXXCtorType Type) { 201d46f98573ba104eda102dd3224b2dca69f1c6336John McCall // The complete constructor is equivalent to the base constructor 202d46f98573ba104eda102dd3224b2dca69f1c6336John McCall // for classes with no virtual bases. Try to emit it as an alias. 203d46f98573ba104eda102dd3224b2dca69f1c6336John McCall if (Type == Ctor_Complete && 204d46f98573ba104eda102dd3224b2dca69f1c6336John McCall !D->getParent()->getNumVBases() && 205d46f98573ba104eda102dd3224b2dca69f1c6336John McCall !TryEmitDefinitionAsAlias(GlobalDecl(D, Ctor_Complete), 206d46f98573ba104eda102dd3224b2dca69f1c6336John McCall GlobalDecl(D, Ctor_Base))) 207d46f98573ba104eda102dd3224b2dca69f1c6336John McCall return; 2081eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 209d46f98573ba104eda102dd3224b2dca69f1c6336John McCall llvm::Function *Fn = cast<llvm::Function>(GetAddrOfCXXConstructor(D, Type)); 2108b2423361648c39a7d8a3c5e8129e12006deac32John McCall setFunctionLinkage(D, Fn); 2111eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2120ff8bafde95f6fa51ccea70738c1b99db870bddcAnders Carlsson CodeGenFunction(*this).GenerateCode(GlobalDecl(D, Type), Fn); 2131eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 21427ae53665f8b00fe4ba21da0fa79a4ce6e0b6cd5Anders Carlsson SetFunctionDefinitionAttributes(D, Fn); 21527ae53665f8b00fe4ba21da0fa79a4ce6e0b6cd5Anders Carlsson SetLLVMFunctionAttributesForDefinition(D, Fn); 21627ae53665f8b00fe4ba21da0fa79a4ce6e0b6cd5Anders Carlsson} 21727ae53665f8b00fe4ba21da0fa79a4ce6e0b6cd5Anders Carlsson 218d46f98573ba104eda102dd3224b2dca69f1c6336John McCallllvm::GlobalValue * 2191eb4433ac451dc16f4133a88af2d002ac26c58efMike StumpCodeGenModule::GetAddrOfCXXConstructor(const CXXConstructorDecl *D, 220363c184139e26ea38223b477ad64ee67b22bb9a7Anders Carlsson CXXCtorType Type) { 221f746aa6a8f538be914173a4aef2d9a2fd9f99d17John McCall MangleBuffer Name; 222f746aa6a8f538be914173a4aef2d9a2fd9f99d17John McCall getMangledCXXCtorName(Name, D, Type); 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()); 230b4880bab7fc1b61267cfd9a0ad52188e7a828cb3Chris Lattner return cast<llvm::Function>( 231b4880bab7fc1b61267cfd9a0ad52188e7a828cb3Chris Lattner GetOrCreateLLVMFunction(Name, FTy, GlobalDecl(D, Type))); 232363c184139e26ea38223b477ad64ee67b22bb9a7Anders Carlsson} 23327ae53665f8b00fe4ba21da0fa79a4ce6e0b6cd5Anders Carlsson 23435415f5132f70ad5097a3514ab84251e10db3664Douglas Gregorvoid CodeGenModule::getMangledName(MangleBuffer &Buffer, const BlockDecl *BD) { 23535415f5132f70ad5097a3514ab84251e10db3664Douglas Gregor getMangleContext().mangleBlock(BD, Buffer.getBuffer()); 23635415f5132f70ad5097a3514ab84251e10db3664Douglas Gregor} 23735415f5132f70ad5097a3514ab84251e10db3664Douglas Gregor 238f746aa6a8f538be914173a4aef2d9a2fd9f99d17John McCallvoid CodeGenModule::getMangledCXXCtorName(MangleBuffer &Name, 239f746aa6a8f538be914173a4aef2d9a2fd9f99d17John McCall const CXXConstructorDecl *D, 240f746aa6a8f538be914173a4aef2d9a2fd9f99d17John McCall CXXCtorType Type) { 241f746aa6a8f538be914173a4aef2d9a2fd9f99d17John McCall getMangleContext().mangleCXXCtor(D, Type, Name.getBuffer()); 24227ae53665f8b00fe4ba21da0fa79a4ce6e0b6cd5Anders Carlsson} 24327ae53665f8b00fe4ba21da0fa79a4ce6e0b6cd5Anders Carlsson 24427ae53665f8b00fe4ba21da0fa79a4ce6e0b6cd5Anders Carlssonvoid CodeGenModule::EmitCXXDestructors(const CXXDestructorDecl *D) { 245d46f98573ba104eda102dd3224b2dca69f1c6336John McCall // The destructor in a virtual table is always a 'deleting' 246d46f98573ba104eda102dd3224b2dca69f1c6336John McCall // destructor, which calls the complete destructor and then uses the 247d46f98573ba104eda102dd3224b2dca69f1c6336John McCall // appropriate operator delete. 248ea9a20834cf9311fdf758cfbd73b8daa8e655f15Eli Friedman if (D->isVirtual()) 249624c7d704dc9f1dbb5dd3e5a0ef7eacfb3b699e2Eli Friedman EmitGlobal(GlobalDecl(D, Dtor_Deleting)); 250d46f98573ba104eda102dd3224b2dca69f1c6336John McCall 251d46f98573ba104eda102dd3224b2dca69f1c6336John McCall // The destructor used for destructing this as a most-derived class; 252d46f98573ba104eda102dd3224b2dca69f1c6336John McCall // call the base destructor and then destructs any virtual bases. 2538e51a1f5da6ef4a1a168d14116c6eed3a578a263John McCall EmitGlobal(GlobalDecl(D, Dtor_Complete)); 254d46f98573ba104eda102dd3224b2dca69f1c6336John McCall 255d46f98573ba104eda102dd3224b2dca69f1c6336John McCall // The destructor used for destructing this as a base class; ignores 256d46f98573ba104eda102dd3224b2dca69f1c6336John McCall // virtual bases. 2578e51a1f5da6ef4a1a168d14116c6eed3a578a263John McCall EmitGlobal(GlobalDecl(D, Dtor_Base)); 25827ae53665f8b00fe4ba21da0fa79a4ce6e0b6cd5Anders Carlsson} 25927ae53665f8b00fe4ba21da0fa79a4ce6e0b6cd5Anders Carlsson 2601eb4433ac451dc16f4133a88af2d002ac26c58efMike Stumpvoid CodeGenModule::EmitCXXDestructor(const CXXDestructorDecl *D, 26127ae53665f8b00fe4ba21da0fa79a4ce6e0b6cd5Anders Carlsson CXXDtorType Type) { 262d46f98573ba104eda102dd3224b2dca69f1c6336John McCall // The complete destructor is equivalent to the base destructor for 263d46f98573ba104eda102dd3224b2dca69f1c6336John McCall // classes with no virtual bases, so try to emit it as an alias. 264d46f98573ba104eda102dd3224b2dca69f1c6336John McCall if (Type == Dtor_Complete && 265d46f98573ba104eda102dd3224b2dca69f1c6336John McCall !D->getParent()->getNumVBases() && 266d46f98573ba104eda102dd3224b2dca69f1c6336John McCall !TryEmitDefinitionAsAlias(GlobalDecl(D, Dtor_Complete), 267d46f98573ba104eda102dd3224b2dca69f1c6336John McCall GlobalDecl(D, Dtor_Base))) 268d46f98573ba104eda102dd3224b2dca69f1c6336John McCall return; 269d46f98573ba104eda102dd3224b2dca69f1c6336John McCall 270c0bf462cf35fe050bddbd8bff967298e4a67e79dJohn McCall // The base destructor is equivalent to the base destructor of its 271c0bf462cf35fe050bddbd8bff967298e4a67e79dJohn McCall // base class if there is exactly one non-virtual base class with a 272c0bf462cf35fe050bddbd8bff967298e4a67e79dJohn McCall // non-trivial destructor, there are no fields with a non-trivial 273c0bf462cf35fe050bddbd8bff967298e4a67e79dJohn McCall // destructor, and the body of the destructor is trivial. 274c0bf462cf35fe050bddbd8bff967298e4a67e79dJohn McCall if (Type == Dtor_Base && !TryEmitBaseDestructorAsAlias(D)) 275c0bf462cf35fe050bddbd8bff967298e4a67e79dJohn McCall return; 276c0bf462cf35fe050bddbd8bff967298e4a67e79dJohn McCall 277d46f98573ba104eda102dd3224b2dca69f1c6336John McCall llvm::Function *Fn = cast<llvm::Function>(GetAddrOfCXXDestructor(D, Type)); 2788b2423361648c39a7d8a3c5e8129e12006deac32John McCall setFunctionLinkage(D, Fn); 2791eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2800ff8bafde95f6fa51ccea70738c1b99db870bddcAnders Carlsson CodeGenFunction(*this).GenerateCode(GlobalDecl(D, Type), Fn); 2811eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 28227ae53665f8b00fe4ba21da0fa79a4ce6e0b6cd5Anders Carlsson SetFunctionDefinitionAttributes(D, Fn); 28327ae53665f8b00fe4ba21da0fa79a4ce6e0b6cd5Anders Carlsson SetLLVMFunctionAttributesForDefinition(D, Fn); 28427ae53665f8b00fe4ba21da0fa79a4ce6e0b6cd5Anders Carlsson} 28527ae53665f8b00fe4ba21da0fa79a4ce6e0b6cd5Anders Carlsson 286d46f98573ba104eda102dd3224b2dca69f1c6336John McCallllvm::GlobalValue * 2871eb4433ac451dc16f4133a88af2d002ac26c58efMike StumpCodeGenModule::GetAddrOfCXXDestructor(const CXXDestructorDecl *D, 28827ae53665f8b00fe4ba21da0fa79a4ce6e0b6cd5Anders Carlsson CXXDtorType Type) { 289f746aa6a8f538be914173a4aef2d9a2fd9f99d17John McCall MangleBuffer Name; 290f746aa6a8f538be914173a4aef2d9a2fd9f99d17John McCall getMangledCXXDtorName(Name, D, Type); 291f746aa6a8f538be914173a4aef2d9a2fd9f99d17John McCall if (llvm::GlobalValue *V = GetGlobalValue(Name)) 292d46f98573ba104eda102dd3224b2dca69f1c6336John McCall return V; 293d46f98573ba104eda102dd3224b2dca69f1c6336John McCall 29427ae53665f8b00fe4ba21da0fa79a4ce6e0b6cd5Anders Carlsson const llvm::FunctionType *FTy = 295f6c56e2323c3f973253805a2f35629f3253ebed4Anders Carlsson getTypes().GetFunctionType(getTypes().getFunctionInfo(D, Type), false); 2961eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 297b4880bab7fc1b61267cfd9a0ad52188e7a828cb3Chris Lattner return cast<llvm::Function>( 298b4880bab7fc1b61267cfd9a0ad52188e7a828cb3Chris Lattner GetOrCreateLLVMFunction(Name, FTy, GlobalDecl(D, Type))); 29927ae53665f8b00fe4ba21da0fa79a4ce6e0b6cd5Anders Carlsson} 30027ae53665f8b00fe4ba21da0fa79a4ce6e0b6cd5Anders Carlsson 301f746aa6a8f538be914173a4aef2d9a2fd9f99d17John McCallvoid CodeGenModule::getMangledCXXDtorName(MangleBuffer &Name, 302f746aa6a8f538be914173a4aef2d9a2fd9f99d17John McCall const CXXDestructorDecl *D, 303f746aa6a8f538be914173a4aef2d9a2fd9f99d17John McCall CXXDtorType Type) { 304f746aa6a8f538be914173a4aef2d9a2fd9f99d17John McCall getMangleContext().mangleCXXDtor(D, Type, Name.getBuffer()); 30527ae53665f8b00fe4ba21da0fa79a4ce6e0b6cd5Anders Carlsson} 306e7d346b6d5cee14b75e34928b3fd423f21d8d80dFariborz Jahanian 307c00129a08c829bb34f22dc13727043c994c85644Eli Friedmanllvm::Constant * 308c00129a08c829bb34f22dc13727043c994c85644Eli FriedmanCodeGenModule::GetCXXMemberFunctionPointerValue(const CXXMethodDecl *MD) { 309c00129a08c829bb34f22dc13727043c994c85644Eli Friedman assert(MD->isInstance() && "Member function must not be static!"); 310c00129a08c829bb34f22dc13727043c994c85644Eli Friedman 311c00129a08c829bb34f22dc13727043c994c85644Eli Friedman MD = MD->getCanonicalDecl(); 312c00129a08c829bb34f22dc13727043c994c85644Eli Friedman 313c00129a08c829bb34f22dc13727043c994c85644Eli Friedman const llvm::Type *PtrDiffTy = Types.ConvertType(Context.getPointerDiffType()); 314c00129a08c829bb34f22dc13727043c994c85644Eli Friedman 315c00129a08c829bb34f22dc13727043c994c85644Eli Friedman // Get the function pointer (or index if this is a virtual function). 316c00129a08c829bb34f22dc13727043c994c85644Eli Friedman if (MD->isVirtual()) { 317c00129a08c829bb34f22dc13727043c994c85644Eli Friedman uint64_t Index = VTables.getMethodVTableIndex(MD); 318c00129a08c829bb34f22dc13727043c994c85644Eli Friedman 319c00129a08c829bb34f22dc13727043c994c85644Eli Friedman // FIXME: We shouldn't use / 8 here. 320c00129a08c829bb34f22dc13727043c994c85644Eli Friedman uint64_t PointerWidthInBytes = Context.Target.getPointerWidth(0) / 8; 321c00129a08c829bb34f22dc13727043c994c85644Eli Friedman 322c00129a08c829bb34f22dc13727043c994c85644Eli Friedman // Itanium C++ ABI 2.3: 323c00129a08c829bb34f22dc13727043c994c85644Eli Friedman // For a non-virtual function, this field is a simple function pointer. 324c00129a08c829bb34f22dc13727043c994c85644Eli Friedman // For a virtual function, it is 1 plus the virtual table offset 325c00129a08c829bb34f22dc13727043c994c85644Eli Friedman // (in bytes) of the function, represented as a ptrdiff_t. 326c00129a08c829bb34f22dc13727043c994c85644Eli Friedman return llvm::ConstantInt::get(PtrDiffTy, (Index * PointerWidthInBytes) + 1); 327c00129a08c829bb34f22dc13727043c994c85644Eli Friedman } 328c00129a08c829bb34f22dc13727043c994c85644Eli Friedman 329c00129a08c829bb34f22dc13727043c994c85644Eli Friedman const FunctionProtoType *FPT = MD->getType()->getAs<FunctionProtoType>(); 330c00129a08c829bb34f22dc13727043c994c85644Eli Friedman const llvm::Type *Ty; 331c00129a08c829bb34f22dc13727043c994c85644Eli Friedman // Check whether the function has a computable LLVM signature. 332c00129a08c829bb34f22dc13727043c994c85644Eli Friedman if (!CodeGenTypes::VerifyFuncTypeComplete(FPT)) { 333c00129a08c829bb34f22dc13727043c994c85644Eli Friedman // The function has a computable LLVM signature; use the correct type. 334c00129a08c829bb34f22dc13727043c994c85644Eli Friedman Ty = Types.GetFunctionType(Types.getFunctionInfo(MD), FPT->isVariadic()); 335c00129a08c829bb34f22dc13727043c994c85644Eli Friedman } else { 336c00129a08c829bb34f22dc13727043c994c85644Eli Friedman // Use an arbitrary non-function type to tell GetAddrOfFunction that the 337c00129a08c829bb34f22dc13727043c994c85644Eli Friedman // function type is incomplete. 338c00129a08c829bb34f22dc13727043c994c85644Eli Friedman Ty = PtrDiffTy; 339c00129a08c829bb34f22dc13727043c994c85644Eli Friedman } 340c00129a08c829bb34f22dc13727043c994c85644Eli Friedman 341c00129a08c829bb34f22dc13727043c994c85644Eli Friedman llvm::Constant *FuncPtr = GetAddrOfFunction(MD, Ty); 342c00129a08c829bb34f22dc13727043c994c85644Eli Friedman return llvm::ConstantExpr::getPtrToInt(FuncPtr, PtrDiffTy); 343c00129a08c829bb34f22dc13727043c994c85644Eli Friedman} 344c00129a08c829bb34f22dc13727043c994c85644Eli Friedman 345046c294a43024874ff35656c6e785b64e72f1f36Anders Carlssonstatic llvm::Value *BuildVirtualCall(CodeGenFunction &CGF, uint64_t VTableIndex, 346566abee1e9828a7700b51e4d17ea08234fde3bb4Anders Carlsson llvm::Value *This, const llvm::Type *Ty) { 347566abee1e9828a7700b51e4d17ea08234fde3bb4Anders Carlsson Ty = Ty->getPointerTo()->getPointerTo()->getPointerTo(); 348566abee1e9828a7700b51e4d17ea08234fde3bb4Anders Carlsson 349046c294a43024874ff35656c6e785b64e72f1f36Anders Carlsson llvm::Value *VTable = CGF.Builder.CreateBitCast(This, Ty); 350046c294a43024874ff35656c6e785b64e72f1f36Anders Carlsson VTable = CGF.Builder.CreateLoad(VTable); 351566abee1e9828a7700b51e4d17ea08234fde3bb4Anders Carlsson 352566abee1e9828a7700b51e4d17ea08234fde3bb4Anders Carlsson llvm::Value *VFuncPtr = 353046c294a43024874ff35656c6e785b64e72f1f36Anders Carlsson CGF.Builder.CreateConstInBoundsGEP1_64(VTable, VTableIndex, "vfn"); 354566abee1e9828a7700b51e4d17ea08234fde3bb4Anders Carlsson return CGF.Builder.CreateLoad(VFuncPtr); 355566abee1e9828a7700b51e4d17ea08234fde3bb4Anders Carlsson} 356566abee1e9828a7700b51e4d17ea08234fde3bb4Anders Carlsson 3572f1986b557fa671c4f8c9dd0d071398edfc073d5Anders Carlssonllvm::Value * 358566abee1e9828a7700b51e4d17ea08234fde3bb4Anders CarlssonCodeGenFunction::BuildVirtualCall(const CXXMethodDecl *MD, llvm::Value *This, 359f0070dbae9535836ad41711081465dec2259786bMike Stump const llvm::Type *Ty) { 360566abee1e9828a7700b51e4d17ea08234fde3bb4Anders Carlsson MD = MD->getCanonicalDecl(); 361046c294a43024874ff35656c6e785b64e72f1f36Anders Carlsson uint64_t VTableIndex = CGM.getVTables().getMethodVTableIndex(MD); 3622b3583573ba6b26b605aacaad9a50492fb3d6fe6Anders Carlsson 363af4403545a50a60d208e6fcae057308d576a92e0Anders Carlsson return ::BuildVirtualCall(*this, VTableIndex, This, Ty); 364566abee1e9828a7700b51e4d17ea08234fde3bb4Anders Carlsson} 365566abee1e9828a7700b51e4d17ea08234fde3bb4Anders Carlsson 366566abee1e9828a7700b51e4d17ea08234fde3bb4Anders Carlssonllvm::Value * 367566abee1e9828a7700b51e4d17ea08234fde3bb4Anders CarlssonCodeGenFunction::BuildVirtualCall(const CXXDestructorDecl *DD, CXXDtorType Type, 368566abee1e9828a7700b51e4d17ea08234fde3bb4Anders Carlsson llvm::Value *&This, const llvm::Type *Ty) { 369566abee1e9828a7700b51e4d17ea08234fde3bb4Anders Carlsson DD = cast<CXXDestructorDecl>(DD->getCanonicalDecl()); 370af4403545a50a60d208e6fcae057308d576a92e0Anders Carlsson uint64_t VTableIndex = 371046c294a43024874ff35656c6e785b64e72f1f36Anders Carlsson CGM.getVTables().getMethodVTableIndex(GlobalDecl(DD, Type)); 372566abee1e9828a7700b51e4d17ea08234fde3bb4Anders Carlsson 373af4403545a50a60d208e6fcae057308d576a92e0Anders Carlsson return ::BuildVirtualCall(*this, VTableIndex, This, Ty); 374f0070dbae9535836ad41711081465dec2259786bMike Stump} 3753a811f1f4286ee3fd0c563c1cfe623956f3caa24Charles Davis 3763a811f1f4286ee3fd0c563c1cfe623956f3caa24Charles DavisCXXABI::~CXXABI() {} 377