CodeGenModule.cpp revision 53bad4e98ed5e765df4231099bf1c737582908bf
15f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer//===--- CodeGenModule.cpp - Emit LLVM Code from ASTs for a Module --------===// 25f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer// 35f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer// The LLVM Compiler Infrastructure 45f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer// 50bc735ffcfb223c0186419547abaa5c84482663eChris Lattner// This file is distributed under the University of Illinois Open Source 60bc735ffcfb223c0186419547abaa5c84482663eChris Lattner// License. See LICENSE.TXT for details. 75f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer// 85f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer//===----------------------------------------------------------------------===// 95f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer// 105f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer// This coordinates the per-module state used while generating code. 115f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer// 125f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer//===----------------------------------------------------------------------===// 135f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 145f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer#include "CodeGenModule.h" 15bd3606426d389370616126af969904ec493cb105Chris Lattner#include "CGDebugInfo.h" 165f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer#include "CodeGenFunction.h" 170dbe227feccf6a8dbadfff8ca3f80416b7bf2f28Daniel Dunbar#include "CodeGenTBAA.h" 18af2f62ce32e462f256855cd24b06dec4755d2827Daniel Dunbar#include "CGCall.h" 195f2bfd4811996abb783aa6c7254c56baa6930e8cDouglas Gregor#include "CGCXXABI.h" 202811ccf48d6d898c42cc4cfad37abedb36236d20Chandler Carruth#include "CGObjCRuntime.h" 215f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer#include "TargetInfo.h" 22c4a1dea2dc56bd1357ec91b829a0b9e68229a13eDaniel Dunbar#include "clang/Frontend/CodeGenOptions.h" 2321ef7ae45c8b91f23cf5eab2263421bb398a644bChris Lattner#include "clang/AST/ASTContext.h" 241b63e4f732dbc73d90abf886b4d21f8e3a165f6dChris Lattner#include "clang/AST/CharUnits.h" 252c8569d5f43f7de1fb993e84c95ea571dd9ac55eChris Lattner#include "clang/AST/DeclObjC.h" 268bd4afeb876fd0015bb808eb2f3de1fe709658a7Nate Begeman#include "clang/AST/DeclCXX.h" 275f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer#include "clang/AST/DeclTemplate.h" 28e9b7d8ace8674585818990cff585daae7745bd88Steve Naroff#include "clang/AST/Mangle.h" 29ec9426ca6039279bcc99bc2c625bb2abe4f0353dNate Begeman#include "clang/AST/RecordLayout.h" 30bef20ac367a09555b30d6eb3847a81ec164caf88Chris Lattner#include "clang/Basic/Builtins.h" 315f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer#include "clang/Basic/Diagnostic.h" 3220ff3108fcd2c3bd734dc79efc22ebaa090abd41Anton Korobeynikov#include "clang/Basic/SourceManager.h" 3378f7ece00e2ddfb64d4ed72a7be770b5b9b805e3Chris Lattner#include "clang/Basic/TargetInfo.h" 345f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer#include "clang/Basic/ConvertUTF.h" 355f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer#include "llvm/CallingConv.h" 365f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer#include "llvm/Module.h" 375f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer#include "llvm/Intrinsics.h" 382811ccf48d6d898c42cc4cfad37abedb36236d20Chandler Carruth#include "llvm/LLVMContext.h" 39fb97b03e42d397405f617be0252be83e77a66f6eChris Lattner#include "llvm/ADT/Triple.h" 40bd3606426d389370616126af969904ec493cb105Chris Lattner#include "llvm/Target/TargetData.h" 41bd3606426d389370616126af969904ec493cb105Chris Lattner#include "llvm/Support/CallSite.h" 422811ccf48d6d898c42cc4cfad37abedb36236d20Chandler Carruth#include "llvm/Support/ErrorHandling.h" 43dbd920c7758e6dfb678a8f503fb14ba97c26f23aAnders Carlssonusing namespace clang; 44dbd920c7758e6dfb678a8f503fb14ba97c26f23aAnders Carlssonusing namespace CodeGen; 45a1cf15f4680e5cf39e72e28c5ea854fcba792e84Owen Anderson 46a1cf15f4680e5cf39e72e28c5ea854fcba792e84Owen Andersonstatic CGCXXABI &createCXXABI(CodeGenModule &CGM) { 47208ff5e8a073de2a5d15cbe03cab8a4c0d935e28Daniel Dunbar switch (CGM.getContext().Target.getCXXABI()) { 483c8f153ae767fa55b2da74438c7f8ec370a06d6fChris Lattner case CXXABI_ARM: return *CreateARMCXXABI(CGM); 493c8f153ae767fa55b2da74438c7f8ec370a06d6fChris Lattner case CXXABI_Itanium: return *CreateItaniumCXXABI(CGM); 503c8f153ae767fa55b2da74438c7f8ec370a06d6fChris Lattner case CXXABI_Microsoft: return *CreateMicrosoftCXXABI(CGM); 513c8f153ae767fa55b2da74438c7f8ec370a06d6fChris Lattner } 523c8f153ae767fa55b2da74438c7f8ec370a06d6fChris Lattner 533c8f153ae767fa55b2da74438c7f8ec370a06d6fChris Lattner llvm_unreachable("invalid C++ ABI kind"); 543c8f153ae767fa55b2da74438c7f8ec370a06d6fChris Lattner return *CreateItaniumCXXABI(CGM); 553c8f153ae767fa55b2da74438c7f8ec370a06d6fChris Lattner} 56e8b9f5b8ea60983c4a74cb8b63879616b914b65aSanjiv Gupta 57e8b9f5b8ea60983c4a74cb8b63879616b914b65aSanjiv Gupta 582811ccf48d6d898c42cc4cfad37abedb36236d20Chandler CarruthCodeGenModule::CodeGenModule(ASTContext &C, const CodeGenOptions &CGO, 592b94fe35edf951a14ecd32b21f7ebcc2e3754c67Chris Lattner llvm::Module &M, const llvm::TargetData &TD, 602b94fe35edf951a14ecd32b21f7ebcc2e3754c67Chris Lattner Diagnostic &diags) 612b94fe35edf951a14ecd32b21f7ebcc2e3754c67Chris Lattner : BlockModule(C, M, TD, Types, *this), Context(C), 62815c78fd9ab8bd5dfe8e8a91b8c6a413e2b8c889Ted Kremenek Features(C.getLangOptions()), CodeGenOpts(CGO), TheModule(M), 63815c78fd9ab8bd5dfe8e8a91b8c6a413e2b8c889Ted Kremenek TheTargetData(TD), TheTargetCodeGenInfo(0), Diags(diags), 64815c78fd9ab8bd5dfe8e8a91b8c6a413e2b8c889Ted Kremenek ABI(createCXXABI(*this)), 65815c78fd9ab8bd5dfe8e8a91b8c6a413e2b8c889Ted Kremenek Types(C, M, TD, getTargetCodeGenInfo().getABIInfo(), ABI), 66815c78fd9ab8bd5dfe8e8a91b8c6a413e2b8c889Ted Kremenek TBAA(0), 6789ed31d3f9eeb8ec77c284a5cf404a74bf5e7acfAnders Carlsson VTables(*this), Runtime(0), 6889ed31d3f9eeb8ec77c284a5cf404a74bf5e7acfAnders Carlsson CFConstantStringClassRef(0), ConstantStringClassRef(0), 6989ed31d3f9eeb8ec77c284a5cf404a74bf5e7acfAnders Carlsson VMContext(M.getContext()), 7082227ff4eb665bbf41720ebdc0dc9215a86ba838Chris Lattner NSConcreteGlobalBlockDecl(0), NSConcreteStackBlockDecl(0), 71208ff5e8a073de2a5d15cbe03cab8a4c0d935e28Daniel Dunbar NSConcreteGlobalBlock(0), NSConcreteStackBlock(0), 72208ff5e8a073de2a5d15cbe03cab8a4c0d935e28Daniel Dunbar BlockObjectAssignDecl(0), BlockObjectDisposeDecl(0), 73208ff5e8a073de2a5d15cbe03cab8a4c0d935e28Daniel Dunbar BlockObjectAssign(0), BlockObjectDispose(0){ 746bfed7e411adc46eaf616371f85f68305c6e6257Daniel Dunbar 756bfed7e411adc46eaf616371f85f68305c6e6257Daniel Dunbar if (!Features.ObjC1) 76532485cc6c078d9e51b517c6bbd8984deb17f0feNate Begeman Runtime = 0; 770269871c9cba493f76237175ab60313406f3bafaDaniel Dunbar else if (!Features.NeXTRuntime) 78f1968f28869f4e0675450ae39c478a37c5b9abd6Daniel Dunbar Runtime = CreateGNUObjCRuntime(*this); 79f1968f28869f4e0675450ae39c478a37c5b9abd6Daniel Dunbar else if (Features.ObjCNonFragileABI) 80488e993a135ce700b982bf099c3d6b856301d642Daniel Dunbar Runtime = CreateMacNonFragileABIObjCRuntime(*this); 812c8569d5f43f7de1fb993e84c95ea571dd9ac55eChris Lattner else 8290df4b6661968a84bf64baee489bb2f6d948fcc1Daniel Dunbar Runtime = CreateMacObjCRuntime(*this); 8390df4b6661968a84bf64baee489bb2f6d948fcc1Daniel Dunbar 8490df4b6661968a84bf64baee489bb2f6d948fcc1Daniel Dunbar // Enable TBAA unless it's suppressed. 8590df4b6661968a84bf64baee489bb2f6d948fcc1Daniel Dunbar if (!CodeGenOpts.RelaxedAliasing && CodeGenOpts.OptimizationLevel > 0) 861eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump TBAA = new CodeGenTBAA(Context, VMContext, getLangOptions(), 8756b8001b42bd603ef593e3cb278d8b9b9ba26ca9Daniel Dunbar ABI.getMangleContext()); 882c8569d5f43f7de1fb993e84c95ea571dd9ac55eChris Lattner 890a14eee528a901c16f0e288fbc10a3abc1660d87Chris Lattner // If debug info generation is enabled, create the CGDebugInfo object. 900a14eee528a901c16f0e288fbc10a3abc1660d87Chris Lattner DebugInfo = CodeGenOpts.DebugInfo ? new CGDebugInfo(*this) : 0; 912c8569d5f43f7de1fb993e84c95ea571dd9ac55eChris Lattner} 9258c3f9ec11cbe852a518bf2f83af46f938b7b852Chris Lattner 93488e993a135ce700b982bf099c3d6b856301d642Daniel DunbarCodeGenModule::~CodeGenModule() { 94c6fdc34ac0183bfa03d65f317c78b7bdac52897eChris Lattner delete Runtime; 9590df4b6661968a84bf64baee489bb2f6d948fcc1Daniel Dunbar delete &ABI; 9690df4b6661968a84bf64baee489bb2f6d948fcc1Daniel Dunbar delete TBAA; 9790df4b6661968a84bf64baee489bb2f6d948fcc1Daniel Dunbar delete DebugInfo; 9890df4b6661968a84bf64baee489bb2f6d948fcc1Daniel Dunbar} 991eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 10056b8001b42bd603ef593e3cb278d8b9b9ba26ca9Daniel Dunbarvoid CodeGenModule::createObjCRuntime() { 101c6fdc34ac0183bfa03d65f317c78b7bdac52897eChris Lattner if (!Features.NeXTRuntime) 1020a14eee528a901c16f0e288fbc10a3abc1660d87Chris Lattner Runtime = CreateGNUObjCRuntime(*this); 103c6fdc34ac0183bfa03d65f317c78b7bdac52897eChris Lattner else if (Features.ObjCNonFragileABI) 104c6fdc34ac0183bfa03d65f317c78b7bdac52897eChris Lattner Runtime = CreateMacNonFragileABIObjCRuntime(*this); 1051eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump else 10604d4078425614bf9fd58d606335c1f5f74ee7fa4Daniel Dunbar Runtime = CreateMacObjCRuntime(*this); 10704d4078425614bf9fd58d606335c1f5f74ee7fa4Daniel Dunbar} 10804d4078425614bf9fd58d606335c1f5f74ee7fa4Daniel Dunbar 10904d4078425614bf9fd58d606335c1f5f74ee7fa4Daniel Dunbarvoid CodeGenModule::Release() { 11004d4078425614bf9fd58d606335c1f5f74ee7fa4Daniel Dunbar EmitDeferred(); 11140b598eea1310ec9ed554d56ce3e25b34c585458Argyrios Kyrtzidis EmitCXXGlobalInitFunc(); 11204d4078425614bf9fd58d606335c1f5f74ee7fa4Daniel Dunbar EmitCXXGlobalDtorFunc(); 11304d4078425614bf9fd58d606335c1f5f74ee7fa4Daniel Dunbar if (Runtime) 1141eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump if (llvm::Function *ObjCInitFunction = Runtime->ModuleInitFunction()) 11504d4078425614bf9fd58d606335c1f5f74ee7fa4Daniel Dunbar AddGlobalCtor(ObjCInitFunction); 11604d4078425614bf9fd58d606335c1f5f74ee7fa4Daniel Dunbar EmitCtorList(GlobalCtors, "llvm.global_ctors"); 11704d4078425614bf9fd58d606335c1f5f74ee7fa4Daniel Dunbar EmitCtorList(GlobalDtors, "llvm.global_dtors"); 11804d4078425614bf9fd58d606335c1f5f74ee7fa4Daniel Dunbar EmitAnnotations(); 11904d4078425614bf9fd58d606335c1f5f74ee7fa4Daniel Dunbar EmitLLVMUsed(); 12004d4078425614bf9fd58d606335c1f5f74ee7fa4Daniel Dunbar 1217e714cd931fa3a90bfd728318a92485aa3e95748Daniel Dunbar SimplifyPersonality(); 1226ab187a49a42de6d351248d8a6e0206e39743a0cDaniel Dunbar 12304d4078425614bf9fd58d606335c1f5f74ee7fa4Daniel Dunbar if (getCodeGenOpts().EmitDeclMetadata) 1244f8d123e3e2c260de3377208106ddba87cee28b4Dan Gohman EmitDeclMetadata(); 1254f8d123e3e2c260de3377208106ddba87cee28b4Dan Gohman} 1261eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 12704d4078425614bf9fd58d606335c1f5f74ee7fa4Daniel Dunbarllvm::MDNode *CodeGenModule::getTBAAInfo(QualType QTy) { 12804d4078425614bf9fd58d606335c1f5f74ee7fa4Daniel Dunbar if (!TBAA) 129df102fcb978588d5edbc661fb5da0b6922f9ab1cChris Lattner return 0; 1307e714cd931fa3a90bfd728318a92485aa3e95748Daniel Dunbar return TBAA->getTBAAInfo(QTy); 1316ab187a49a42de6d351248d8a6e0206e39743a0cDaniel Dunbar} 1327e714cd931fa3a90bfd728318a92485aa3e95748Daniel Dunbar 1336ab187a49a42de6d351248d8a6e0206e39743a0cDaniel Dunbarvoid CodeGenModule::DecorateInstruction(llvm::Instruction *Inst, 13404d4078425614bf9fd58d606335c1f5f74ee7fa4Daniel Dunbar llvm::MDNode *TBAAInfo) { 1357cd2e93125e2f3b6ca01b24ed0c3fd7e94683fd9Fariborz Jahanian Inst->setMetadata(llvm::LLVMContext::MD_tbaa, TBAAInfo); 13604d4078425614bf9fd58d606335c1f5f74ee7fa4Daniel Dunbar} 13704d4078425614bf9fd58d606335c1f5f74ee7fa4Daniel Dunbar 13804d4078425614bf9fd58d606335c1f5f74ee7fa4Daniel Dunbarbool CodeGenModule::isTargetDarwin() const { 13904d4078425614bf9fd58d606335c1f5f74ee7fa4Daniel Dunbar return getContext().Target.getTriple().getOS() == llvm::Triple::Darwin; 14004d4078425614bf9fd58d606335c1f5f74ee7fa4Daniel Dunbar} 14104d4078425614bf9fd58d606335c1f5f74ee7fa4Daniel Dunbar 1427cd2e93125e2f3b6ca01b24ed0c3fd7e94683fd9Fariborz Jahanian/// ErrorUnsupported - Print out an error that codegen doesn't support the 1437cd2e93125e2f3b6ca01b24ed0c3fd7e94683fd9Fariborz Jahanian/// specified stmt yet. 1447cd2e93125e2f3b6ca01b24ed0c3fd7e94683fd9Fariborz Jahanianvoid CodeGenModule::ErrorUnsupported(const Stmt *S, const char *Type, 1452a131fbca2a51085dc083b8c56a2d4ced3cf1413Anders Carlsson bool OmitOnError) { 1464a6835e650ff24e19ce08a3bd347c0ad186777fdAnders Carlsson if (OmitOnError && getDiags().hasErrorOccurred()) 1471eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump return; 1482a131fbca2a51085dc083b8c56a2d4ced3cf1413Anders Carlsson unsigned DiagID = getDiags().getCustomDiagID(Diagnostic::Error, 1492a131fbca2a51085dc083b8c56a2d4ced3cf1413Anders Carlsson "cannot compile this %0 yet"); 1502a131fbca2a51085dc083b8c56a2d4ced3cf1413Anders Carlsson std::string Msg = Type; 1512a131fbca2a51085dc083b8c56a2d4ced3cf1413Anders Carlsson getDiags().Report(Context.getFullLoc(S->getLocStart()), DiagID) 1521eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump << Msg << S->getSourceRange(); 1532a131fbca2a51085dc083b8c56a2d4ced3cf1413Anders Carlsson} 1542a131fbca2a51085dc083b8c56a2d4ced3cf1413Anders Carlsson 1552a131fbca2a51085dc083b8c56a2d4ced3cf1413Anders Carlsson/// ErrorUnsupported - Print out an error that codegen doesn't support the 1565f2bfd4811996abb783aa6c7254c56baa6930e8cDouglas Gregor/// specified decl yet. 1575f2bfd4811996abb783aa6c7254c56baa6930e8cDouglas Gregorvoid CodeGenModule::ErrorUnsupported(const Decl *D, const char *Type, 1585f2bfd4811996abb783aa6c7254c56baa6930e8cDouglas Gregor bool OmitOnError) { 159c50689bd1e8788a7fc8f19070b7505ff95034979Chris Lattner if (OmitOnError && getDiags().hasErrorOccurred()) 160c50689bd1e8788a7fc8f19070b7505ff95034979Chris Lattner return; 1615f2bfd4811996abb783aa6c7254c56baa6930e8cDouglas Gregor unsigned DiagID = getDiags().getCustomDiagID(Diagnostic::Error, 1626ec3668a2608b63473207319f5ceff9bbd22ea51Douglas Gregor "cannot compile this %0 yet"); 163c50689bd1e8788a7fc8f19070b7505ff95034979Chris Lattner std::string Msg = Type; 164c50689bd1e8788a7fc8f19070b7505ff95034979Chris Lattner getDiags().Report(Context.getFullLoc(D->getLocation()), DiagID) << Msg; 165c50689bd1e8788a7fc8f19070b7505ff95034979Chris Lattner} 1663c8f153ae767fa55b2da74438c7f8ec370a06d6fChris Lattner 167c50689bd1e8788a7fc8f19070b7505ff95034979Chris Lattnervoid CodeGenModule::setGlobalVisibility(llvm::GlobalValue *GV, 1681eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump const NamedDecl *D) const { 1696ec3668a2608b63473207319f5ceff9bbd22ea51Douglas Gregor // Internal definitions always have default visibility. 1706ec3668a2608b63473207319f5ceff9bbd22ea51Douglas Gregor if (GV->hasLocalLinkage()) { 171b540491851910c2efa68196a8bdc2eed1071c17dAnders Carlsson GV->setVisibility(llvm::GlobalValue::DefaultVisibility); 172fe345572459b69a6b680322fef504b4f8bd98dd7Daniel Dunbar return; 1733c8f153ae767fa55b2da74438c7f8ec370a06d6fChris Lattner } 174fe345572459b69a6b680322fef504b4f8bd98dd7Daniel Dunbar 1755f2bfd4811996abb783aa6c7254c56baa6930e8cDouglas Gregor // Set visibility for definitions. 1766ec3668a2608b63473207319f5ceff9bbd22ea51Douglas Gregor NamedDecl::LinkageInfo LV = D->getLinkageAndVisibility(); 17795d4e5d2f87a0f07fb143ccb824dfc4c5c595c78Anders Carlsson if (LV.visibilityExplicit() || !GV->hasAvailableExternallyLinkage()) 17895d4e5d2f87a0f07fb143ccb824dfc4c5c595c78Anders Carlsson GV->setVisibility(GetLLVMVisibility(LV.visibility())); 17995d4e5d2f87a0f07fb143ccb824dfc4c5c595c78Anders Carlsson} 18095d4e5d2f87a0f07fb143ccb824dfc4c5c595c78Anders Carlsson 18195d4e5d2f87a0f07fb143ccb824dfc4c5c595c78Anders Carlsson/// Set the symbol visibility of type information (vtable and RTTI) 18295d4e5d2f87a0f07fb143ccb824dfc4c5c595c78Anders Carlsson/// associated with the given type. 1831eb4433ac451dc16f4133a88af2d002ac26c58efMike Stumpvoid CodeGenModule::setTypeVisibility(llvm::GlobalValue *GV, 18495d4e5d2f87a0f07fb143ccb824dfc4c5c595c78Anders Carlsson const CXXRecordDecl *RD, 1855f2bfd4811996abb783aa6c7254c56baa6930e8cDouglas Gregor TypeVisibilityKind TVK) const { 1865f2bfd4811996abb783aa6c7254c56baa6930e8cDouglas Gregor setGlobalVisibility(GV, RD); 1876d39760673df2e92d9293f46ff8c66dad6ab5e0aChris Lattner 1886d39760673df2e92d9293f46ff8c66dad6ab5e0aChris Lattner if (!CodeGenOpts.HiddenWeakVTables) 1896bfed7e411adc46eaf616371f85f68305c6e6257Daniel Dunbar return; 19049988884c1da4b2200bfe2298a1e41b3f044e8d4Daniel Dunbar 1916bfed7e411adc46eaf616371f85f68305c6e6257Daniel Dunbar // We never want to drop the visibility for RTTI names. 1926d39760673df2e92d9293f46ff8c66dad6ab5e0aChris Lattner if (TVK == TVK_ForRTTIName) 1936d39760673df2e92d9293f46ff8c66dad6ab5e0aChris Lattner return; 1946bfed7e411adc46eaf616371f85f68305c6e6257Daniel Dunbar 1956bfed7e411adc46eaf616371f85f68305c6e6257Daniel Dunbar // We want to drop the visibility to hidden for weak type symbols. 1966bfed7e411adc46eaf616371f85f68305c6e6257Daniel Dunbar // This isn't possible if there might be unresolved references 19749988884c1da4b2200bfe2298a1e41b3f044e8d4Daniel Dunbar // elsewhere that rely on this symbol being visible. 1986bfed7e411adc46eaf616371f85f68305c6e6257Daniel Dunbar 1996bfed7e411adc46eaf616371f85f68305c6e6257Daniel Dunbar // This should be kept roughly in sync with setThunkVisibility 2006bfed7e411adc46eaf616371f85f68305c6e6257Daniel Dunbar // in CGVTables.cpp. 2016bfed7e411adc46eaf616371f85f68305c6e6257Daniel Dunbar 2026bfed7e411adc46eaf616371f85f68305c6e6257Daniel Dunbar // Preconditions. 2036bfed7e411adc46eaf616371f85f68305c6e6257Daniel Dunbar if (GV->getLinkage() != llvm::GlobalVariable::LinkOnceODRLinkage || 2041eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump GV->getVisibility() != llvm::GlobalVariable::DefaultVisibility) 2056bfed7e411adc46eaf616371f85f68305c6e6257Daniel Dunbar return; 2066bfed7e411adc46eaf616371f85f68305c6e6257Daniel Dunbar 20796e0fc726c6fe7538522c60743705d5e696b40afOwen Anderson // Don't override an explicit visibility attribute. 2086bfed7e411adc46eaf616371f85f68305c6e6257Daniel Dunbar if (RD->hasAttr<VisibilityAttr>()) 2096bfed7e411adc46eaf616371f85f68305c6e6257Daniel Dunbar return; 2101eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2111eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump switch (RD->getTemplateSpecializationKind()) { 21296e0fc726c6fe7538522c60743705d5e696b40afOwen Anderson // We have to disable the optimization if this is an EI definition 2136bfed7e411adc46eaf616371f85f68305c6e6257Daniel Dunbar // because there might be EI declarations in other shared objects. 2146bfed7e411adc46eaf616371f85f68305c6e6257Daniel Dunbar case TSK_ExplicitInstantiationDefinition: 2156bfed7e411adc46eaf616371f85f68305c6e6257Daniel Dunbar case TSK_ExplicitInstantiationDeclaration: 2166bfed7e411adc46eaf616371f85f68305c6e6257Daniel Dunbar return; 2176bfed7e411adc46eaf616371f85f68305c6e6257Daniel Dunbar 2181eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // Every use of a non-template class's type information has to emit it. 2190032b2781b4deb131f8c9b7968f2030bf2489cddOwen Anderson case TSK_Undeclared: 2203c4972def972f8ca44dcd0561779a12aaa6fec97Owen Anderson break; 22108e252425ca2cbdc44ba65d9a657ed5398014e36Owen Anderson 2226bfed7e411adc46eaf616371f85f68305c6e6257Daniel Dunbar // In theory, implicit instantiations can ignore the possibility of 2236bfed7e411adc46eaf616371f85f68305c6e6257Daniel Dunbar // an explicit instantiation declaration because there necessarily 2246bfed7e411adc46eaf616371f85f68305c6e6257Daniel Dunbar // must be an EI definition somewhere with default visibility. In 22596e0fc726c6fe7538522c60743705d5e696b40afOwen Anderson // practice, it's possible to have an explicit instantiation for 2261c431b323d776362490bbf7cc796b74fedaf19f2Owen Anderson // an arbitrary template class, and linkers aren't necessarily able 227572cf09ae8a78af1c56d40b016ec4cf1837163acChris Lattner // to deal with mixed-visibility symbols. 2287db6d838aad4083fe86d7bf703a75fe6e8a17856Owen Anderson case TSK_ExplicitSpecialization: 2291c431b323d776362490bbf7cc796b74fedaf19f2Owen Anderson case TSK_ImplicitInstantiation: 2306d39760673df2e92d9293f46ff8c66dad6ab5e0aChris Lattner if (!CodeGenOpts.HiddenWeakTemplateVTables) 2316d39760673df2e92d9293f46ff8c66dad6ab5e0aChris Lattner return; 2326d39760673df2e92d9293f46ff8c66dad6ab5e0aChris Lattner break; 233532485cc6c078d9e51b517c6bbd8984deb17f0feNate Begeman } 234532485cc6c078d9e51b517c6bbd8984deb17f0feNate Begeman 235532485cc6c078d9e51b517c6bbd8984deb17f0feNate Begeman // If there's a key function, there may be translation units 236532485cc6c078d9e51b517c6bbd8984deb17f0feNate Begeman // that don't have the key function's definition. But ignore 237532485cc6c078d9e51b517c6bbd8984deb17f0feNate Begeman // this if we're emitting RTTI under -fno-rtti. 238532485cc6c078d9e51b517c6bbd8984deb17f0feNate Begeman if (!(TVK != TVK_ForRTTI) || Features.RTTI) { 23996e0fc726c6fe7538522c60743705d5e696b40afOwen Anderson if (Context.getKeyFunction(RD)) 240532485cc6c078d9e51b517c6bbd8984deb17f0feNate Begeman return; 241532485cc6c078d9e51b517c6bbd8984deb17f0feNate Begeman } 2421eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2431eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // Otherwise, drop the visibility to hidden. 2441eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump GV->setVisibility(llvm::GlobalValue::HiddenVisibility); 2451c431b323d776362490bbf7cc796b74fedaf19f2Owen Anderson GV->setUnnamedAddr(true); 246532485cc6c078d9e51b517c6bbd8984deb17f0feNate Begeman} 247532485cc6c078d9e51b517c6bbd8984deb17f0feNate Begeman 248532485cc6c078d9e51b517c6bbd8984deb17f0feNate Begemanllvm::StringRef CodeGenModule::getMangledName(GlobalDecl GD) { 24986daeee2d4aa6523679f07f27a826bf4c42ca95dChris Lattner const NamedDecl *ND = cast<NamedDecl>(GD.getDecl()); 2501eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 25168584ed35ad819a1668e3f527ba7f5dd4ae6a333Douglas Gregor llvm::StringRef &Str = MangledDeclNames[GD.getCanonicalDecl()]; 2529aeed32282fe8a775c24c01c923717ca86695685John McCall if (!Str.empty()) 2539aeed32282fe8a775c24c01c923717ca86695685John McCall return Str; 2549aeed32282fe8a775c24c01c923717ca86695685John McCall 2559aeed32282fe8a775c24c01c923717ca86695685John McCall if (!getCXXABI().getMangleContext().shouldMangleDeclName(ND)) { 2569aeed32282fe8a775c24c01c923717ca86695685John McCall IdentifierInfo *II = ND->getIdentifier(); 2577d9c3c92c90ae36d58ec21bc53c4c08e02ac3555Douglas Gregor assert(II && "Attempt to mangle unnamed decl."); 2587d9c3c92c90ae36d58ec21bc53c4c08e02ac3555Douglas Gregor 2597d9c3c92c90ae36d58ec21bc53c4c08e02ac3555Douglas Gregor Str = II->getName(); 2607d9c3c92c90ae36d58ec21bc53c4c08e02ac3555Douglas Gregor return Str; 2611fd2dd145d9bcdf0b8d60a88e1795b6ae83656f5Douglas Gregor } 2621fd2dd145d9bcdf0b8d60a88e1795b6ae83656f5Douglas Gregor 2631fd2dd145d9bcdf0b8d60a88e1795b6ae83656f5Douglas Gregor llvm::SmallString<256> Buffer; 2641eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump if (const CXXConstructorDecl *D = dyn_cast<CXXConstructorDecl>(ND)) 265d0e3daf2b980b505e535d35b432c938c6d0208efDouglas Gregor getCXXABI().getMangleContext().mangleCXXCtor(D, GD.getCtorType(), Buffer); 2661fd2dd145d9bcdf0b8d60a88e1795b6ae83656f5Douglas Gregor else if (const CXXDestructorDecl *D = dyn_cast<CXXDestructorDecl>(ND)) 2671eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump getCXXABI().getMangleContext().mangleCXXDtor(D, GD.getDtorType(), Buffer); 2687ced9c8529b734e313f62a3b81189d6f402f6713Douglas Gregor else if (const BlockDecl *BD = dyn_cast<BlockDecl>(ND)) 2691fd2dd145d9bcdf0b8d60a88e1795b6ae83656f5Douglas Gregor getCXXABI().getMangleContext().mangleBlock(BD, Buffer); 2701eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump else 2711fc09a92d0bffda20e06fa882388c01e192e2069Douglas Gregor getCXXABI().getMangleContext().mangleName(ND, Buffer); 2721fc09a92d0bffda20e06fa882388c01e192e2069Douglas Gregor 2731fc09a92d0bffda20e06fa882388c01e192e2069Douglas Gregor // Allocate space for the mangled name. 2741fc09a92d0bffda20e06fa882388c01e192e2069Douglas Gregor size_t Length = Buffer.size(); 2751fc09a92d0bffda20e06fa882388c01e192e2069Douglas Gregor char *Name = MangledNamesAllocator.Allocate<char>(Length); 276cbb8fc18d86a886856f5b852a6a3ead71fec17f9Chris Lattner std::copy(Buffer.begin(), Buffer.end(), Name); 2771fc09a92d0bffda20e06fa882388c01e192e2069Douglas Gregor 278b3efa98e320590e8be9d62818e89e599303e65b4Douglas Gregor Str = llvm::StringRef(Name, Length); 2791fc09a92d0bffda20e06fa882388c01e192e2069Douglas Gregor 280b3efa98e320590e8be9d62818e89e599303e65b4Douglas Gregor return Str; 2817d9c3c92c90ae36d58ec21bc53c4c08e02ac3555Douglas Gregor} 2827d9c3c92c90ae36d58ec21bc53c4c08e02ac3555Douglas Gregor 2837d9c3c92c90ae36d58ec21bc53c4c08e02ac3555Douglas Gregorvoid CodeGenModule::getBlockMangledName(GlobalDecl GD, MangleBuffer &Buffer, 2847d9c3c92c90ae36d58ec21bc53c4c08e02ac3555Douglas Gregor const BlockDecl *BD) { 2857d9c3c92c90ae36d58ec21bc53c4c08e02ac3555Douglas Gregor MangleContext &MangleCtx = getCXXABI().getMangleContext(); 2867d9c3c92c90ae36d58ec21bc53c4c08e02ac3555Douglas Gregor const Decl *D = GD.getDecl(); 2877d9c3c92c90ae36d58ec21bc53c4c08e02ac3555Douglas Gregor if (D == 0) 2887d9c3c92c90ae36d58ec21bc53c4c08e02ac3555Douglas Gregor MangleCtx.mangleGlobalBlock(BD, Buffer.getBuffer()); 2897d9c3c92c90ae36d58ec21bc53c4c08e02ac3555Douglas Gregor else if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(D)) 2907d9c3c92c90ae36d58ec21bc53c4c08e02ac3555Douglas Gregor MangleCtx.mangleCtorBlock(CD, GD.getCtorType(), BD, Buffer.getBuffer()); 2911fc09a92d0bffda20e06fa882388c01e192e2069Douglas Gregor else if (const CXXDestructorDecl *DD = dyn_cast<CXXDestructorDecl>(D)) 2927c65e990e9f0dafaf9adbc59b766dcc23eaee845Daniel Dunbar MangleCtx.mangleDtorBlock(DD, GD.getDtorType(), BD, Buffer.getBuffer()); 2937c65e990e9f0dafaf9adbc59b766dcc23eaee845Daniel Dunbar else 2947c65e990e9f0dafaf9adbc59b766dcc23eaee845Daniel Dunbar MangleCtx.mangleBlock(cast<DeclContext>(D), BD, Buffer.getBuffer()); 295b97b69244a4e7916c7b8fca28fa21b36ce5b30b2Daniel Dunbar} 296f5408fe484495ee4efbdd709c8a2c2fdbbbdb328Mike Stump 297f5408fe484495ee4efbdd709c8a2c2fdbbbdb328Mike Stumpllvm::GlobalValue *CodeGenModule::GetGlobalValue(llvm::StringRef Name) { 2987c65e990e9f0dafaf9adbc59b766dcc23eaee845Daniel Dunbar return getModule().getNamedValue(Name); 2997c65e990e9f0dafaf9adbc59b766dcc23eaee845Daniel Dunbar} 30068584ed35ad819a1668e3f527ba7f5dd4ae6a333Douglas Gregor 3017c65e990e9f0dafaf9adbc59b766dcc23eaee845Daniel Dunbar/// AddGlobalCtor - Add a function to the list that will be called before 30255d6f50b23a1fd0a04b568787a25beb7537e6c9bDaniel Dunbar/// main() runs. 3039f9427999cf69b3b89cd0ed3be16ed27a1c282c7Chris Lattnervoid CodeGenModule::AddGlobalCtor(llvm::Function * Ctor, int Priority) { 30440b598eea1310ec9ed554d56ce3e25b34c585458Argyrios Kyrtzidis // FIXME: Type coercion of void()* types. 3057c65e990e9f0dafaf9adbc59b766dcc23eaee845Daniel Dunbar GlobalCtors.push_back(std::make_pair(Ctor, Priority)); 30640b598eea1310ec9ed554d56ce3e25b34c585458Argyrios Kyrtzidis} 30744b0bc008ee11cdee69ad12210ca7550e4fa426aChris Lattner 308cbb8fc18d86a886856f5b852a6a3ead71fec17f9Chris Lattner/// AddGlobalDtor - Add a function to the list that will be called 309cbb8fc18d86a886856f5b852a6a3ead71fec17f9Chris Lattner/// when the module is unloaded. 310cbb8fc18d86a886856f5b852a6a3ead71fec17f9Chris Lattnervoid CodeGenModule::AddGlobalDtor(llvm::Function * Dtor, int Priority) { 311d9d049a93c55624908e81cf3927b7905efeba05fChris Lattner // FIXME: Type coercion of void()* types. 3121fd2dd145d9bcdf0b8d60a88e1795b6ae83656f5Douglas Gregor GlobalDtors.push_back(std::make_pair(Dtor, Priority)); 31386daeee2d4aa6523679f07f27a826bf4c42ca95dChris Lattner} 31486daeee2d4aa6523679f07f27a826bf4c42ca95dChris Lattner 31586daeee2d4aa6523679f07f27a826bf4c42ca95dChris Lattnervoid CodeGenModule::EmitCtorList(const CtorList &Fns, const char *GlobalName) { 31686daeee2d4aa6523679f07f27a826bf4c42ca95dChris Lattner // Ctor function type is void()*. 31786daeee2d4aa6523679f07f27a826bf4c42ca95dChris Lattner llvm::FunctionType* CtorFTy = 31886daeee2d4aa6523679f07f27a826bf4c42ca95dChris Lattner llvm::FunctionType::get(llvm::Type::getVoidTy(VMContext), false); 31986daeee2d4aa6523679f07f27a826bf4c42ca95dChris Lattner llvm::Type *CtorPFTy = llvm::PointerType::getUnqual(CtorFTy); 3207c65e990e9f0dafaf9adbc59b766dcc23eaee845Daniel Dunbar 321cbb8fc18d86a886856f5b852a6a3ead71fec17f9Chris Lattner // Get the type of a ctor entry, { i32, void ()* }. 322cbb8fc18d86a886856f5b852a6a3ead71fec17f9Chris Lattner llvm::StructType* CtorStructTy = 3237c65e990e9f0dafaf9adbc59b766dcc23eaee845Daniel Dunbar llvm::StructType::get(VMContext, llvm::Type::getInt32Ty(VMContext), 3240dbe227feccf6a8dbadfff8ca3f80416b7bf2f28Daniel Dunbar llvm::PointerType::getUnqual(CtorFTy), NULL); 325d4cbda6292b321c2e7dce7f039d92918fee99b3aNuno Lopes 3267c65e990e9f0dafaf9adbc59b766dcc23eaee845Daniel Dunbar // Construct the constructor and destructor arrays. 327d4cbda6292b321c2e7dce7f039d92918fee99b3aNuno Lopes std::vector<llvm::Constant*> Ctors; 328d4cbda6292b321c2e7dce7f039d92918fee99b3aNuno Lopes for (CtorList::const_iterator I = Fns.begin(), E = Fns.end(); I != E; ++I) { 3297dbd8197040313d796282d4af06eccdf8a17319cDaniel Dunbar std::vector<llvm::Constant*> S; 3301eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump S.push_back(llvm::ConstantInt::get(llvm::Type::getInt32Ty(VMContext), 3317dbd8197040313d796282d4af06eccdf8a17319cDaniel Dunbar I->second, false)); 332ca6408c3176783f0b29da4679a08512aa05f0c73Daniel Dunbar S.push_back(llvm::ConstantExpr::getBitCast(I->first, CtorPFTy)); 333761d7f78e2dac7ea5f35828c2271e60d91e106ceDevang Patel Ctors.push_back(llvm::ConstantStruct::get(CtorStructTy, S)); 334ca6408c3176783f0b29da4679a08512aa05f0c73Daniel Dunbar } 335761d7f78e2dac7ea5f35828c2271e60d91e106ceDevang Patel 336ca6408c3176783f0b29da4679a08512aa05f0c73Daniel Dunbar if (!Ctors.empty()) { 337ca6408c3176783f0b29da4679a08512aa05f0c73Daniel Dunbar llvm::ArrayType *AT = llvm::ArrayType::get(CtorStructTy, Ctors.size()); 338f80519b919a348db004fba18530706314d1ebfb5Daniel Dunbar new llvm::GlobalVariable(TheModule, AT, false, 339f80519b919a348db004fba18530706314d1ebfb5Daniel Dunbar llvm::GlobalValue::AppendingLinkage, 3407c65e990e9f0dafaf9adbc59b766dcc23eaee845Daniel Dunbar llvm::ConstantArray::get(AT, Ctors), 3417c65e990e9f0dafaf9adbc59b766dcc23eaee845Daniel Dunbar GlobalName); 34274ac74ae244c501027924c99f2a33559a1e23b53Daniel Dunbar } 3431eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump} 344af668b0e7d3581dea3b4f29a9262686e83887e5bDaniel Dunbar 34540b598eea1310ec9ed554d56ce3e25b34c585458Argyrios Kyrtzidisvoid CodeGenModule::EmitAnnotations() { 346af668b0e7d3581dea3b4f29a9262686e83887e5bDaniel Dunbar if (Annotations.empty()) 3471eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump return; 3481feade8e520be483293dbf55eb57a51720899589Mike Stump 34981ebbde0fb30a40df0f5e913d8a1f71c383d271aAnders Carlsson // Create a new global variable for the ConstantStruct in the Module. 350f55314dce992fd60816ba337ad151a2fb7c42239Mike Stump llvm::Constant *Array = 351fd015353a3c4f528216276f25df5b4d464d7a0cdAnders Carlsson llvm::ConstantArray::get(llvm::ArrayType::get(Annotations[0]->getType(), 352fd015353a3c4f528216276f25df5b4d464d7a0cdAnders Carlsson Annotations.size()), 353fd015353a3c4f528216276f25df5b4d464d7a0cdAnders Carlsson Annotations); 354fd015353a3c4f528216276f25df5b4d464d7a0cdAnders Carlsson llvm::GlobalValue *gv = 355fd015353a3c4f528216276f25df5b4d464d7a0cdAnders Carlsson new llvm::GlobalVariable(TheModule, Array->getType(), false, 356f55314dce992fd60816ba337ad151a2fb7c42239Mike Stump llvm::GlobalValue::AppendingLinkage, Array, 357f55314dce992fd60816ba337ad151a2fb7c42239Mike Stump "llvm.global.annotations"); 358fb51ddfafcd5f8536d0312b3daa3c0b74b90ab5bMike Stump gv->setSection("llvm.metadata"); 359bd6dbd19781cefd5b5ff9750c8bf86e6c341a68cMike Stump} 360bd6dbd19781cefd5b5ff9750c8bf86e6c341a68cMike Stump 361f80519b919a348db004fba18530706314d1ebfb5Daniel Dunbarllvm::GlobalValue::LinkageTypes 362f80519b919a348db004fba18530706314d1ebfb5Daniel DunbarCodeGenModule::getFunctionLinkage(const FunctionDecl *D) { 3631eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump GVALinkage Linkage = getContext().GetGVALinkageForFunction(D); 3647c65e990e9f0dafaf9adbc59b766dcc23eaee845Daniel Dunbar 3657c65e990e9f0dafaf9adbc59b766dcc23eaee845Daniel Dunbar if (Linkage == GVA_Internal) 3667c65e990e9f0dafaf9adbc59b766dcc23eaee845Daniel Dunbar return llvm::Function::InternalLinkage; 36740b598eea1310ec9ed554d56ce3e25b34c585458Argyrios Kyrtzidis 3687c65e990e9f0dafaf9adbc59b766dcc23eaee845Daniel Dunbar if (D->hasAttr<DLLExportAttr>()) 3697c65e990e9f0dafaf9adbc59b766dcc23eaee845Daniel Dunbar return llvm::Function::DLLExportLinkage; 37040b598eea1310ec9ed554d56ce3e25b34c585458Argyrios Kyrtzidis 3717c65e990e9f0dafaf9adbc59b766dcc23eaee845Daniel Dunbar if (D->hasAttr<WeakAttr>()) 3727c65e990e9f0dafaf9adbc59b766dcc23eaee845Daniel Dunbar return llvm::Function::WeakAnyLinkage; 3737c65e990e9f0dafaf9adbc59b766dcc23eaee845Daniel Dunbar 3740e4f40e1bbc4dce16bbb9870300a435419f1b3d5Daniel Dunbar // In C99 mode, 'inline' functions are guaranteed to have a strong 3750e4f40e1bbc4dce16bbb9870300a435419f1b3d5Daniel Dunbar // definition somewhere else, so we can use available_externally linkage. 3760e4f40e1bbc4dce16bbb9870300a435419f1b3d5Daniel Dunbar if (Linkage == GVA_C99Inline) 3770e4f40e1bbc4dce16bbb9870300a435419f1b3d5Daniel Dunbar return llvm::Function::AvailableExternallyLinkage; 3780e4f40e1bbc4dce16bbb9870300a435419f1b3d5Daniel Dunbar 3797c65e990e9f0dafaf9adbc59b766dcc23eaee845Daniel Dunbar // In C++, the compiler has to emit a definition in every translation unit 3807c65e990e9f0dafaf9adbc59b766dcc23eaee845Daniel Dunbar // that references the function. We should use linkonce_odr because 3817c65e990e9f0dafaf9adbc59b766dcc23eaee845Daniel Dunbar // a) if all references in this translation unit are optimized away, we 3820e4f40e1bbc4dce16bbb9870300a435419f1b3d5Daniel Dunbar // don't need to codegen it. b) if the function persists, it needs to be 383f80519b919a348db004fba18530706314d1ebfb5Daniel Dunbar // merged with other definitions. c) C++ has the ODR, so we know the 384f80519b919a348db004fba18530706314d1ebfb5Daniel Dunbar // definition is dependable. 385f80519b919a348db004fba18530706314d1ebfb5Daniel Dunbar if (Linkage == GVA_CXXInline || Linkage == GVA_TemplateInstantiation) 386c6c14d1cd68afcd90d097715296377f15be45210Eli Friedman return !Context.getLangOptions().AppleKext 387c6c14d1cd68afcd90d097715296377f15be45210Eli Friedman ? llvm::Function::LinkOnceODRLinkage 388c6c14d1cd68afcd90d097715296377f15be45210Eli Friedman : llvm::Function::InternalLinkage; 389c6c14d1cd68afcd90d097715296377f15be45210Eli Friedman 3901eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // An explicit instantiation of a template has weak linkage, since 3917c65e990e9f0dafaf9adbc59b766dcc23eaee845Daniel Dunbar // explicit instantiations can occur in multiple translation units 3927c65e990e9f0dafaf9adbc59b766dcc23eaee845Daniel Dunbar // and must all be equivalent. However, we are not allowed to 3931eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // throw away these explicit instantiations. 39440b598eea1310ec9ed554d56ce3e25b34c585458Argyrios Kyrtzidis if (Linkage == GVA_ExplicitTemplateInstantiation) 3957c65e990e9f0dafaf9adbc59b766dcc23eaee845Daniel Dunbar return !Context.getLangOptions().AppleKext 3961eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump ? llvm::Function::WeakODRLinkage 39740b598eea1310ec9ed554d56ce3e25b34c585458Argyrios Kyrtzidis : llvm::Function::InternalLinkage; 3987c65e990e9f0dafaf9adbc59b766dcc23eaee845Daniel Dunbar 3991eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // Otherwise, we have strong external linkage. 4007c65e990e9f0dafaf9adbc59b766dcc23eaee845Daniel Dunbar assert(Linkage == GVA_StrongExternal); 4017c65e990e9f0dafaf9adbc59b766dcc23eaee845Daniel Dunbar return llvm::Function::ExternalLinkage; 4021eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump} 4037c65e990e9f0dafaf9adbc59b766dcc23eaee845Daniel Dunbar 4047c65e990e9f0dafaf9adbc59b766dcc23eaee845Daniel Dunbar 40540b598eea1310ec9ed554d56ce3e25b34c585458Argyrios Kyrtzidis/// SetFunctionDefinitionAttributes - Set attributes for a global. 4067c65e990e9f0dafaf9adbc59b766dcc23eaee845Daniel Dunbar/// 407219df6644e2338ff067471ab0d85f27b88544ac2Daniel Dunbar/// FIXME: This is currently only done for aliases and functions, but not for 408219df6644e2338ff067471ab0d85f27b88544ac2Daniel Dunbar/// variables (these details are set in EmitGlobalVarDefinition for variables). 4090269871c9cba493f76237175ab60313406f3bafaDaniel Dunbarvoid CodeGenModule::SetFunctionDefinitionAttributes(const FunctionDecl *D, 4101eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump llvm::GlobalValue *GV) { 4110269871c9cba493f76237175ab60313406f3bafaDaniel Dunbar SetCommonAttributes(D, GV); 41235f38a2c22d68c22e2dbe8e9ee84c120c8f327bbChris Lattner} 4130269871c9cba493f76237175ab60313406f3bafaDaniel Dunbar 4140269871c9cba493f76237175ab60313406f3bafaDaniel Dunbarvoid CodeGenModule::SetLLVMFunctionAttributes(const Decl *D, 4150269871c9cba493f76237175ab60313406f3bafaDaniel Dunbar const CGFunctionInfo &Info, 4160269871c9cba493f76237175ab60313406f3bafaDaniel Dunbar llvm::Function *F) { 417ad64e024bd18cf25dcfa44e049004371838decd8Chris Lattner unsigned CallingConv; 4180269871c9cba493f76237175ab60313406f3bafaDaniel Dunbar AttributeListType AttributeList; 4190269871c9cba493f76237175ab60313406f3bafaDaniel Dunbar ConstructAttributeList(Info, D, AttributeList, CallingConv); 4203c0ef8cc0dc246bd3083e8cdd63005e8873d36d2Benjamin Kramer F->setAttributes(llvm::AttrListPtr::get(AttributeList.begin(), 4211eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump AttributeList.size())); 42235f38a2c22d68c22e2dbe8e9ee84c120c8f327bbChris Lattner F->setCallingConv(static_cast<llvm::CallingConv::ID>(CallingConv)); 42335f38a2c22d68c22e2dbe8e9ee84c120c8f327bbChris Lattner} 42435f38a2c22d68c22e2dbe8e9ee84c120c8f327bbChris Lattner 42535f38a2c22d68c22e2dbe8e9ee84c120c8f327bbChris Lattnervoid CodeGenModule::SetLLVMFunctionAttributesForDefinition(const Decl *D, 4261eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump llvm::Function *F) { 4271eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump if (!Features.Exceptions && !Features.ObjCNonFragileABI) 428a1cf15f4680e5cf39e72e28c5ea854fcba792e84Owen Anderson F->addFnAttr(llvm::Attribute::NoUnwind); 42935f38a2c22d68c22e2dbe8e9ee84c120c8f327bbChris Lattner 4301eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump if (D->hasAttr<AlwaysInlineAttr>()) 431c38e9affd4519ea199af22419c8c794973cc4b23Fariborz Jahanian F->addFnAttr(llvm::Attribute::AlwaysInline); 432c38e9affd4519ea199af22419c8c794973cc4b23Fariborz Jahanian 43396e0fc726c6fe7538522c60743705d5e696b40afOwen Anderson if (D->hasAttr<NakedAttr>()) 4341eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump F->addFnAttr(llvm::Attribute::Naked); 4351eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4361eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump if (D->hasAttr<NoInlineAttr>()) 4370269871c9cba493f76237175ab60313406f3bafaDaniel Dunbar F->addFnAttr(llvm::Attribute::NoInline); 4387db6d838aad4083fe86d7bf703a75fe6e8a17856Owen Anderson 4391c431b323d776362490bbf7cc796b74fedaf19f2Owen Anderson if (isa<CXXConstructorDecl>(D) || isa<CXXDestructorDecl>(D)) 4400269871c9cba493f76237175ab60313406f3bafaDaniel Dunbar F->setUnnamedAddr(true); 4410269871c9cba493f76237175ab60313406f3bafaDaniel Dunbar 4420269871c9cba493f76237175ab60313406f3bafaDaniel Dunbar if (Features.getStackProtectorMode() == LangOptions::SSPOn) 4430269871c9cba493f76237175ab60313406f3bafaDaniel Dunbar F->addFnAttr(llvm::Attribute::StackProtect); 4440269871c9cba493f76237175ab60313406f3bafaDaniel Dunbar else if (Features.getStackProtectorMode() == LangOptions::SSPReq) 44567b00520c8f5b48fad722b790d87fea6be764efeChris Lattner F->addFnAttr(llvm::Attribute::StackProtectReq); 44667b00520c8f5b48fad722b790d87fea6be764efeChris Lattner 44767b00520c8f5b48fad722b790d87fea6be764efeChris Lattner unsigned alignment = D->getMaxAlignment() / Context.getCharWidth(); 44867b00520c8f5b48fad722b790d87fea6be764efeChris Lattner if (alignment) 4492a131fbca2a51085dc083b8c56a2d4ced3cf1413Anders Carlsson F->setAlignment(alignment); 45067b00520c8f5b48fad722b790d87fea6be764efeChris Lattner 45167b00520c8f5b48fad722b790d87fea6be764efeChris Lattner // C++ ABI requires 2-byte alignment for member functions. 45267b00520c8f5b48fad722b790d87fea6be764efeChris Lattner if (F->getAlignment() < 2 && isa<CXXMethodDecl>(D)) 45367b00520c8f5b48fad722b790d87fea6be764efeChris Lattner F->setAlignment(2); 45467b00520c8f5b48fad722b790d87fea6be764efeChris Lattner} 45567b00520c8f5b48fad722b790d87fea6be764efeChris Lattner 45667b00520c8f5b48fad722b790d87fea6be764efeChris Lattnervoid CodeGenModule::SetCommonAttributes(const Decl *D, 45767b00520c8f5b48fad722b790d87fea6be764efeChris Lattner llvm::GlobalValue *GV) { 4581eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump if (const NamedDecl *ND = dyn_cast<NamedDecl>(D)) 45967b00520c8f5b48fad722b790d87fea6be764efeChris Lattner setGlobalVisibility(GV, ND); 46067b00520c8f5b48fad722b790d87fea6be764efeChris Lattner else 4611eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump GV->setVisibility(llvm::GlobalValue::DefaultVisibility); 46267b00520c8f5b48fad722b790d87fea6be764efeChris Lattner 46367b00520c8f5b48fad722b790d87fea6be764efeChris Lattner if (D->hasAttr<UsedAttr>()) 46467b00520c8f5b48fad722b790d87fea6be764efeChris Lattner AddUsedGlobal(GV); 4655f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 4665f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (const SectionAttr *SA = D->getAttr<SectionAttr>()) 4671eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump GV->setSection(SA->getName()); 4688bd4afeb876fd0015bb808eb2f3de1fe709658a7Nate Begeman 4691eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump getTargetCodeGenInfo().SetTargetAttributes(D, GV, *this); 4701eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump} 4711eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4728bd4afeb876fd0015bb808eb2f3de1fe709658a7Nate Begemanvoid CodeGenModule::SetInternalFunctionAttributes(const Decl *D, 4738bd4afeb876fd0015bb808eb2f3de1fe709658a7Nate Begeman llvm::Function *F, 4748bd4afeb876fd0015bb808eb2f3de1fe709658a7Nate Begeman const CGFunctionInfo &FI) { 4758bd4afeb876fd0015bb808eb2f3de1fe709658a7Nate Begeman SetLLVMFunctionAttributes(D, FI, F); 4768bd4afeb876fd0015bb808eb2f3de1fe709658a7Nate Begeman SetLLVMFunctionAttributesForDefinition(D, F); 4778bd4afeb876fd0015bb808eb2f3de1fe709658a7Nate Begeman 4781eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump F->setLinkage(llvm::Function::InternalLinkage); 4798bd4afeb876fd0015bb808eb2f3de1fe709658a7Nate Begeman 4808bd4afeb876fd0015bb808eb2f3de1fe709658a7Nate Begeman SetCommonAttributes(D, F); 4818bd4afeb876fd0015bb808eb2f3de1fe709658a7Nate Begeman} 4828bd4afeb876fd0015bb808eb2f3de1fe709658a7Nate Begeman 4838bd4afeb876fd0015bb808eb2f3de1fe709658a7Nate Begemanvoid CodeGenModule::SetFunctionAttributes(GlobalDecl GD, 4848bd4afeb876fd0015bb808eb2f3de1fe709658a7Nate Begeman llvm::Function *F, 4853c0ef8cc0dc246bd3083e8cdd63005e8873d36d2Benjamin Kramer bool IsIncompleteFunction) { 4861eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump const FunctionDecl *FD = cast<FunctionDecl>(GD.getDecl()); 4870032b2781b4deb131f8c9b7968f2030bf2489cddOwen Anderson 4880032b2781b4deb131f8c9b7968f2030bf2489cddOwen Anderson if (!IsIncompleteFunction) 4890032b2781b4deb131f8c9b7968f2030bf2489cddOwen Anderson SetLLVMFunctionAttributes(FD, getTypes().getFunctionInfo(GD), F); 4908bd4afeb876fd0015bb808eb2f3de1fe709658a7Nate Begeman 4918bd4afeb876fd0015bb808eb2f3de1fe709658a7Nate Begeman // Only a few attributes are set on declarations; these may later be 4928bd4afeb876fd0015bb808eb2f3de1fe709658a7Nate Begeman // overridden by a definition. 4938bd4afeb876fd0015bb808eb2f3de1fe709658a7Nate Begeman 4941eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump if (FD->hasAttr<DLLImportAttr>()) { 49595b851e55c328af4b69da7bfc1124bf258c0ffe5Chris Lattner F->setLinkage(llvm::Function::DLLImportLinkage); 49695b851e55c328af4b69da7bfc1124bf258c0ffe5Chris Lattner } else if (FD->hasAttr<WeakAttr>() || 49795b851e55c328af4b69da7bfc1124bf258c0ffe5Chris Lattner FD->hasAttr<WeakImportAttr>()) { 4988bd4afeb876fd0015bb808eb2f3de1fe709658a7Nate Begeman // "extern_weak" is overloaded in LLVM; we probably should have 4998bd4afeb876fd0015bb808eb2f3de1fe709658a7Nate Begeman // separate linkage types for this. 50095b851e55c328af4b69da7bfc1124bf258c0ffe5Chris Lattner F->setLinkage(llvm::Function::ExternalWeakLinkage); 5011eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump } else { 50295b851e55c328af4b69da7bfc1124bf258c0ffe5Chris Lattner F->setLinkage(llvm::Function::ExternalLinkage); 5038bd4afeb876fd0015bb808eb2f3de1fe709658a7Nate Begeman 50457d5cee133495bc21d1abdbce45ab05a79274a23Daniel Dunbar NamedDecl::LinkageInfo LV = FD->getLinkageAndVisibility(); 5058bd4afeb876fd0015bb808eb2f3de1fe709658a7Nate Begeman if (LV.linkage() == ExternalLinkage && LV.visibilityExplicit()) { 5063c4972def972f8ca44dcd0561779a12aaa6fec97Owen Anderson F->setVisibility(GetLLVMVisibility(LV.visibility())); 5073c4972def972f8ca44dcd0561779a12aaa6fec97Owen Anderson } 5083c4972def972f8ca44dcd0561779a12aaa6fec97Owen Anderson } 5090032b2781b4deb131f8c9b7968f2030bf2489cddOwen Anderson 5108bd4afeb876fd0015bb808eb2f3de1fe709658a7Nate Begeman if (const SectionAttr *SA = FD->getAttr<SectionAttr>()) 51147a434ff3d49e7906eda88e8e8242e4297725b32Owen Anderson F->setSection(SA->getName()); 5128bd4afeb876fd0015bb808eb2f3de1fe709658a7Nate Begeman} 5138bd4afeb876fd0015bb808eb2f3de1fe709658a7Nate Begeman 51473241dfeb5c498255b662984cca369fd28ec3147Daniel Dunbarvoid CodeGenModule::AddUsedGlobal(llvm::GlobalValue *GV) { 5155c61d97ad442b2c0bbecb617c8f21857ce1fff6dDaniel Dunbar assert(!GV->isDeclaration() && 5165c61d97ad442b2c0bbecb617c8f21857ce1fff6dDaniel Dunbar "Only globals with definition can force usage."); 51740b598eea1310ec9ed554d56ce3e25b34c585458Argyrios Kyrtzidis LLVMUsed.push_back(GV); 51873241dfeb5c498255b662984cca369fd28ec3147Daniel Dunbar} 519bd012ff1fa088181646a784f385b28867372d434Daniel Dunbar 520bd012ff1fa088181646a784f385b28867372d434Daniel Dunbarvoid CodeGenModule::EmitLLVMUsed() { 52173241dfeb5c498255b662984cca369fd28ec3147Daniel Dunbar // Don't create llvm.used if there is no need. 5221eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump if (LLVMUsed.empty()) 52340b598eea1310ec9ed554d56ce3e25b34c585458Argyrios Kyrtzidis return; 52473241dfeb5c498255b662984cca369fd28ec3147Daniel Dunbar 52573241dfeb5c498255b662984cca369fd28ec3147Daniel Dunbar const llvm::Type *i8PTy = llvm::Type::getInt8PtrTy(VMContext); 52668584ed35ad819a1668e3f527ba7f5dd4ae6a333Douglas Gregor 5271eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // Convert LLVMUsed to what ConstantArray needs. 528dbb5a376c8b9272813a30c5519031e9ea2fb071fChris Lattner std::vector<llvm::Constant*> UsedArray; 52986daeee2d4aa6523679f07f27a826bf4c42ca95dChris Lattner UsedArray.resize(LLVMUsed.size()); 530cbb8fc18d86a886856f5b852a6a3ead71fec17f9Chris Lattner for (unsigned i = 0, e = LLVMUsed.size(); i != e; ++i) { 531cbb8fc18d86a886856f5b852a6a3ead71fec17f9Chris Lattner UsedArray[i] = 532dbb5a376c8b9272813a30c5519031e9ea2fb071fChris Lattner llvm::ConstantExpr::getBitCast(cast<llvm::Constant>(&*LLVMUsed[i]), 533dbb5a376c8b9272813a30c5519031e9ea2fb071fChris Lattner i8PTy); 53473241dfeb5c498255b662984cca369fd28ec3147Daniel Dunbar } 5351eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 536dbb5a376c8b9272813a30c5519031e9ea2fb071fChris Lattner if (UsedArray.empty()) 537dbb5a376c8b9272813a30c5519031e9ea2fb071fChris Lattner return; 538b6c8c8bd8d362c8a6cdb767415b0d21e62b77eb2Douglas Gregor llvm::ArrayType *ATy = llvm::ArrayType::get(i8PTy, UsedArray.size()); 53974d644abe56809d9bcea7311f37aa9063ab9e064Anders Carlsson 54074d644abe56809d9bcea7311f37aa9063ab9e064Anders Carlsson llvm::GlobalVariable *GV = 54174d644abe56809d9bcea7311f37aa9063ab9e064Anders Carlsson new llvm::GlobalVariable(getModule(), ATy, false, 54274d644abe56809d9bcea7311f37aa9063ab9e064Anders Carlsson llvm::GlobalValue::AppendingLinkage, 54374d644abe56809d9bcea7311f37aa9063ab9e064Anders Carlsson llvm::ConstantArray::get(ATy, UsedArray), 54474d644abe56809d9bcea7311f37aa9063ab9e064Anders Carlsson "llvm.used"); 54574d644abe56809d9bcea7311f37aa9063ab9e064Anders Carlsson 54674d644abe56809d9bcea7311f37aa9063ab9e064Anders Carlsson GV->setSection("llvm.metadata"); 54774d644abe56809d9bcea7311f37aa9063ab9e064Anders Carlsson} 54874d644abe56809d9bcea7311f37aa9063ab9e064Anders Carlsson 54974d644abe56809d9bcea7311f37aa9063ab9e064Anders Carlssonvoid CodeGenModule::EmitDeferred() { 5501028c9f0afc1cc5f4951b39b7067fa57c1fea07bDouglas Gregor // Emit code for any potentially referenced deferred decls. Since a 5511028c9f0afc1cc5f4951b39b7067fa57c1fea07bDouglas Gregor // previously unused static decl may become used during the generation of code 552393c247fe025ccb5f914e37e948192ea86faef8cFariborz Jahanian // for a static function, iterate until no changes are made. 553393c247fe025ccb5f914e37e948192ea86faef8cFariborz Jahanian 554393c247fe025ccb5f914e37e948192ea86faef8cFariborz Jahanian while (!DeferredDeclsToEmit.empty() || !DeferredVTables.empty()) { 555393c247fe025ccb5f914e37e948192ea86faef8cFariborz Jahanian if (!DeferredVTables.empty()) { 556393c247fe025ccb5f914e37e948192ea86faef8cFariborz Jahanian const CXXRecordDecl *RD = DeferredVTables.back(); 557393c247fe025ccb5f914e37e948192ea86faef8cFariborz Jahanian DeferredVTables.pop_back(); 558393c247fe025ccb5f914e37e948192ea86faef8cFariborz Jahanian getVTables().GenerateClassData(getVTableLinkage(RD), RD); 559393c247fe025ccb5f914e37e948192ea86faef8cFariborz Jahanian continue; 560393c247fe025ccb5f914e37e948192ea86faef8cFariborz Jahanian } 56173241dfeb5c498255b662984cca369fd28ec3147Daniel Dunbar 56273241dfeb5c498255b662984cca369fd28ec3147Daniel Dunbar GlobalDecl D = DeferredDeclsToEmit.back(); 563b4880bab7fc1b61267cfd9a0ad52188e7a828cb3Chris Lattner DeferredDeclsToEmit.pop_back(); 5644a6835e650ff24e19ce08a3bd347c0ad186777fdAnders Carlsson 5651eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // Check to see if we've already emitted this. This is necessary 566bd53271dc7570b54f7b7cab7b09bcf04c6e927f6Chris Lattner // for a couple of reasons: first, decls can end up in the 567bd53271dc7570b54f7b7cab7b09bcf04c6e927f6Chris Lattner // deferred-decls queue multiple times, and second, decls can end 56840b598eea1310ec9ed554d56ce3e25b34c585458Argyrios Kyrtzidis // up with definitions in unusual ways (e.g. by an extern inline 569bd53271dc7570b54f7b7cab7b09bcf04c6e927f6Chris Lattner // function acquiring a strong function redefinition). Just 570219df6644e2338ff067471ab0d85f27b88544ac2Daniel Dunbar // ignore these cases. 57167b00520c8f5b48fad722b790d87fea6be764efeChris Lattner // 5725e1e1f95c98b1add70c238093bbd5dc8d4f9c4e9Daniel Dunbar // TODO: That said, looking this up multiple times is very wasteful. 57373241dfeb5c498255b662984cca369fd28ec3147Daniel Dunbar llvm::StringRef Name = getMangledName(D); 57473241dfeb5c498255b662984cca369fd28ec3147Daniel Dunbar llvm::GlobalValue *CGRef = GetGlobalValue(Name); 57573241dfeb5c498255b662984cca369fd28ec3147Daniel Dunbar assert(CGRef && "Deferred decl wasn't referenced?"); 5760269871c9cba493f76237175ab60313406f3bafaDaniel Dunbar 5770269871c9cba493f76237175ab60313406f3bafaDaniel Dunbar if (!CGRef->isDeclaration()) 578bd012ff1fa088181646a784f385b28867372d434Daniel Dunbar continue; 579bd012ff1fa088181646a784f385b28867372d434Daniel Dunbar 580b6c8c8bd8d362c8a6cdb767415b0d21e62b77eb2Douglas Gregor // GlobalAlias::isDeclaration() defers to the aliasee, but for our 5812928c2107f2e0007f35fe1c224aab63535f1403dAnders Carlsson // purposes an alias counts as a definition. 5821eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump if (isa<llvm::GlobalAlias>(CGRef)) 58348a83b5e7ae4051c7c11680ac00c1fa02d610a62Douglas Gregor continue; 584b6c8c8bd8d362c8a6cdb767415b0d21e62b77eb2Douglas Gregor 585b6c8c8bd8d362c8a6cdb767415b0d21e62b77eb2Douglas Gregor // Otherwise, emit the definition and move on to the next one. 586b6c8c8bd8d362c8a6cdb767415b0d21e62b77eb2Douglas Gregor EmitGlobalDefinition(D); 587b6c8c8bd8d362c8a6cdb767415b0d21e62b77eb2Douglas Gregor } 58873241dfeb5c498255b662984cca369fd28ec3147Daniel Dunbar} 5894c13b7a3973d2d263d9682d7b68fbfeb76334af5Nate Begeman 5904c13b7a3973d2d263d9682d7b68fbfeb76334af5Nate Begeman/// EmitAnnotateAttr - Generate the llvm::ConstantStruct which contains the 59167b00520c8f5b48fad722b790d87fea6be764efeChris Lattner/// annotation information for a given GlobalValue. The annotation struct is 59267b00520c8f5b48fad722b790d87fea6be764efeChris Lattner/// {i8 *, i8 *, i8 *, i32}. The first field is a constant expression, the 59373241dfeb5c498255b662984cca369fd28ec3147Daniel Dunbar/// GlobalValue being annotated. The second field is the constant string 59467b00520c8f5b48fad722b790d87fea6be764efeChris Lattner/// created from the AnnotateAttr's annotation. The third field is a constant 59567b00520c8f5b48fad722b790d87fea6be764efeChris Lattner/// string containing the name of the translation unit. The fourth field is 5962a131fbca2a51085dc083b8c56a2d4ced3cf1413Anders Carlsson/// the line number in the file of the annotated value declaration. 59767b00520c8f5b48fad722b790d87fea6be764efeChris Lattner/// 5982a131fbca2a51085dc083b8c56a2d4ced3cf1413Anders Carlsson/// FIXME: this does not unique the annotation string constants, as llvm-gcc 59967b00520c8f5b48fad722b790d87fea6be764efeChris Lattner/// appears to. 60067b00520c8f5b48fad722b790d87fea6be764efeChris Lattner/// 60167b00520c8f5b48fad722b790d87fea6be764efeChris Lattnerllvm::Constant *CodeGenModule::EmitAnnotateAttr(llvm::GlobalValue *GV, 60267b00520c8f5b48fad722b790d87fea6be764efeChris Lattner const AnnotateAttr *AA, 6032a131fbca2a51085dc083b8c56a2d4ced3cf1413Anders Carlsson unsigned LineNo) { 60467b00520c8f5b48fad722b790d87fea6be764efeChris Lattner llvm::Module *M = &getModule(); 605bd012ff1fa088181646a784f385b28867372d434Daniel Dunbar 606bd012ff1fa088181646a784f385b28867372d434Daniel Dunbar // get [N x i8] constants for the annotation string, and the filename string 607bd012ff1fa088181646a784f385b28867372d434Daniel Dunbar // which are the 2nd and 3rd elements of the global annotation structure. 608bd012ff1fa088181646a784f385b28867372d434Daniel Dunbar const llvm::Type *SBP = llvm::Type::getInt8PtrTy(VMContext); 6092a131fbca2a51085dc083b8c56a2d4ced3cf1413Anders Carlsson llvm::Constant *anno = llvm::ConstantArray::get(VMContext, 6104c13b7a3973d2d263d9682d7b68fbfeb76334af5Nate Begeman AA->getAnnotation(), true); 6114c13b7a3973d2d263d9682d7b68fbfeb76334af5Nate Begeman llvm::Constant *unit = llvm::ConstantArray::get(VMContext, 612b4880bab7fc1b61267cfd9a0ad52188e7a828cb3Chris Lattner M->getModuleIdentifier(), 6134a6835e650ff24e19ce08a3bd347c0ad186777fdAnders Carlsson true); 6141eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 6158e2efcc267ed12dc435782288b7f9a4a1bc56c72Anders Carlsson // Get the two global values corresponding to the ConstantArrays we just 6168e2efcc267ed12dc435782288b7f9a4a1bc56c72Anders Carlsson // created to hold the bytes of the strings. 6178e2efcc267ed12dc435782288b7f9a4a1bc56c72Anders Carlsson llvm::GlobalValue *annoGV = 6188e2efcc267ed12dc435782288b7f9a4a1bc56c72Anders Carlsson new llvm::GlobalVariable(*M, anno->getType(), false, 6192a131fbca2a51085dc083b8c56a2d4ced3cf1413Anders Carlsson llvm::GlobalValue::PrivateLinkage, anno, 6202a131fbca2a51085dc083b8c56a2d4ced3cf1413Anders Carlsson GV->getName()); 6217267c1693abe7875b0c57268be05005ae013c6c9Anders Carlsson // translation unit name string, emitted into the llvm.metadata section. 6227267c1693abe7875b0c57268be05005ae013c6c9Anders Carlsson llvm::GlobalValue *unitGV = 623b4880bab7fc1b61267cfd9a0ad52188e7a828cb3Chris Lattner new llvm::GlobalVariable(*M, unit->getType(), false, 624b4880bab7fc1b61267cfd9a0ad52188e7a828cb3Chris Lattner llvm::GlobalValue::PrivateLinkage, unit, 6252a131fbca2a51085dc083b8c56a2d4ced3cf1413Anders Carlsson ".str"); 626bd012ff1fa088181646a784f385b28867372d434Daniel Dunbar unitGV->setUnnamedAddr(true); 6272a131fbca2a51085dc083b8c56a2d4ced3cf1413Anders Carlsson 628bd012ff1fa088181646a784f385b28867372d434Daniel Dunbar // Create the ConstantStruct for the global annotation. 629bd012ff1fa088181646a784f385b28867372d434Daniel Dunbar llvm::Constant *Fields[4] = { 630bd012ff1fa088181646a784f385b28867372d434Daniel Dunbar llvm::ConstantExpr::getBitCast(GV, SBP), 631bd012ff1fa088181646a784f385b28867372d434Daniel Dunbar llvm::ConstantExpr::getBitCast(annoGV, SBP), 63274391b48b4791cded373683a3baf67314f358d50Chris Lattner llvm::ConstantExpr::getBitCast(unitGV, SBP), 63374391b48b4791cded373683a3baf67314f358d50Chris Lattner llvm::ConstantInt::get(llvm::Type::getInt32Ty(VMContext), LineNo) 63474391b48b4791cded373683a3baf67314f358d50Chris Lattner }; 63574391b48b4791cded373683a3baf67314f358d50Chris Lattner return llvm::ConstantStruct::get(VMContext, Fields, 4, false); 63674391b48b4791cded373683a3baf67314f358d50Chris Lattner} 63774391b48b4791cded373683a3baf67314f358d50Chris Lattner 63874391b48b4791cded373683a3baf67314f358d50Chris Lattnerbool CodeGenModule::MayDeferGeneration(const ValueDecl *Global) { 63974391b48b4791cded373683a3baf67314f358d50Chris Lattner // Never defer when EmitAllDecls is specified. 64074391b48b4791cded373683a3baf67314f358d50Chris Lattner if (Features.EmitAllDecls) 641b4880bab7fc1b61267cfd9a0ad52188e7a828cb3Chris Lattner return false; 6420558e79840bfdbbd38c6e2b4f6765bf0158e85f4Chris Lattner 6430558e79840bfdbbd38c6e2b4f6765bf0158e85f4Chris Lattner return !getContext().DeclMustBeEmitted(Global); 6440558e79840bfdbbd38c6e2b4f6765bf0158e85f4Chris Lattner} 6450558e79840bfdbbd38c6e2b4f6765bf0158e85f4Chris Lattner 6460558e79840bfdbbd38c6e2b4f6765bf0158e85f4Chris Lattnerllvm::Constant *CodeGenModule::GetWeakRefReference(const ValueDecl *VD) { 6471eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump const AliasAttr *AA = VD->getAttr<AliasAttr>(); 6480558e79840bfdbbd38c6e2b4f6765bf0158e85f4Chris Lattner assert(AA && "No alias?"); 64996e0fc726c6fe7538522c60743705d5e696b40afOwen Anderson 6503c4972def972f8ca44dcd0561779a12aaa6fec97Owen Anderson const llvm::Type *DeclTy = getTypes().ConvertTypeForMem(VD->getType()); 6510558e79840bfdbbd38c6e2b4f6765bf0158e85f4Chris Lattner 6521eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // See if there is already something with the target's name in the module. 653654ad40f27d684e8f3eddbc990247a6dbea5ddedEli Friedman llvm::GlobalValue *Entry = GetGlobalValue(AA->getAliasee()); 654654ad40f27d684e8f3eddbc990247a6dbea5ddedEli Friedman 655654ad40f27d684e8f3eddbc990247a6dbea5ddedEli Friedman llvm::Constant *Aliasee; 656654ad40f27d684e8f3eddbc990247a6dbea5ddedEli Friedman if (isa<llvm::FunctionType>(DeclTy)) 657654ad40f27d684e8f3eddbc990247a6dbea5ddedEli Friedman Aliasee = GetOrCreateLLVMFunction(AA->getAliasee(), DeclTy, GlobalDecl()); 658654ad40f27d684e8f3eddbc990247a6dbea5ddedEli Friedman else 659654ad40f27d684e8f3eddbc990247a6dbea5ddedEli Friedman Aliasee = GetOrCreateLLVMGlobal(AA->getAliasee(), 660654ad40f27d684e8f3eddbc990247a6dbea5ddedEli Friedman llvm::PointerType::getUnqual(DeclTy), 0); 661654ad40f27d684e8f3eddbc990247a6dbea5ddedEli Friedman if (!Entry) { 662654ad40f27d684e8f3eddbc990247a6dbea5ddedEli Friedman llvm::GlobalValue* F = cast<llvm::GlobalValue>(Aliasee); 663654ad40f27d684e8f3eddbc990247a6dbea5ddedEli Friedman F->setLinkage(llvm::Function::ExternalWeakLinkage); 664654ad40f27d684e8f3eddbc990247a6dbea5ddedEli Friedman WeakRefReferences.insert(F); 665654ad40f27d684e8f3eddbc990247a6dbea5ddedEli Friedman } 666654ad40f27d684e8f3eddbc990247a6dbea5ddedEli Friedman 667654ad40f27d684e8f3eddbc990247a6dbea5ddedEli Friedman return Aliasee; 668654ad40f27d684e8f3eddbc990247a6dbea5ddedEli Friedman} 669654ad40f27d684e8f3eddbc990247a6dbea5ddedEli Friedman 670654ad40f27d684e8f3eddbc990247a6dbea5ddedEli Friedmanvoid CodeGenModule::EmitGlobal(GlobalDecl GD) { 67167b00520c8f5b48fad722b790d87fea6be764efeChris Lattner const ValueDecl *Global = cast<ValueDecl>(GD.getDecl()); 67267b00520c8f5b48fad722b790d87fea6be764efeChris Lattner 67367b00520c8f5b48fad722b790d87fea6be764efeChris Lattner // Weak references don't produce any output by themselves. 6741eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump if (Global->hasAttr<WeakRefAttr>()) 6759fa959d5bfbbb17d7c6ba71252219201fc8dc971Chris Lattner return; 67667b00520c8f5b48fad722b790d87fea6be764efeChris Lattner 67767b00520c8f5b48fad722b790d87fea6be764efeChris Lattner // If this is an alias definition (which otherwise looks like a declaration) 67867b00520c8f5b48fad722b790d87fea6be764efeChris Lattner // emit it now. 67967b00520c8f5b48fad722b790d87fea6be764efeChris Lattner if (Global->hasAttr<AliasAttr>()) 68067b00520c8f5b48fad722b790d87fea6be764efeChris Lattner return EmitAliasDefinition(GD); 681b4880bab7fc1b61267cfd9a0ad52188e7a828cb3Chris Lattner 6820c337ed63ff0f04fd8315afabb2d7a51969fdc97Chris Lattner // Ignore declarations, they will be emitted on their first use. 6830c337ed63ff0f04fd8315afabb2d7a51969fdc97Chris Lattner if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(Global)) { 6840c337ed63ff0f04fd8315afabb2d7a51969fdc97Chris Lattner if (FD->getIdentifier()) { 685b4880bab7fc1b61267cfd9a0ad52188e7a828cb3Chris Lattner llvm::StringRef Name = FD->getName(); 686b4880bab7fc1b61267cfd9a0ad52188e7a828cb3Chris Lattner if (Name == "_Block_object_assign") { 687c7ff8e19081c2e974f05f66c4fa9b40750fc655fFariborz Jahanian BlockObjectAssignDecl = FD; 688c7ff8e19081c2e974f05f66c4fa9b40750fc655fFariborz Jahanian } else if (Name == "_Block_object_dispose") { 689c7ff8e19081c2e974f05f66c4fa9b40750fc655fFariborz Jahanian BlockObjectDisposeDecl = FD; 6901eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump } 691c7ff8e19081c2e974f05f66c4fa9b40750fc655fFariborz Jahanian } 69297a937532c24a8ea44317d4fdee26d9701a1e83cFariborz Jahanian 69397a937532c24a8ea44317d4fdee26d9701a1e83cFariborz Jahanian // Forward declarations are emitted lazily on first use. 6949889652dbc10060cd604861ed2e5bc6719f845b0Fariborz Jahanian if (!FD->isThisDeclarationADefinition()) 695c7ff8e19081c2e974f05f66c4fa9b40750fc655fFariborz Jahanian return; 696c7ff8e19081c2e974f05f66c4fa9b40750fc655fFariborz Jahanian } else { 6971eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump const VarDecl *VD = cast<VarDecl>(Global); 698b193a414f13d7cfa2524a8149eff8d4871f8cbf6Fariborz Jahanian assert(VD->isFileVarDecl() && "Cannot emit local var decl as global."); 699ad25883a644dd6b52c7923dd128a7d05fb26213cFariborz Jahanian 700ad25883a644dd6b52c7923dd128a7d05fb26213cFariborz Jahanian if (VD->getIdentifier()) { 701ad25883a644dd6b52c7923dd128a7d05fb26213cFariborz Jahanian llvm::StringRef Name = VD->getName(); 70267b00520c8f5b48fad722b790d87fea6be764efeChris Lattner if (Name == "_NSConcreteGlobalBlock") { 7031eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump NSConcreteGlobalBlockDecl = VD; 7040558e79840bfdbbd38c6e2b4f6765bf0158e85f4Chris Lattner } else if (Name == "_NSConcreteStackBlock") { 7050558e79840bfdbbd38c6e2b4f6765bf0158e85f4Chris Lattner NSConcreteStackBlockDecl = VD; 7060558e79840bfdbbd38c6e2b4f6765bf0158e85f4Chris Lattner } 70797a937532c24a8ea44317d4fdee26d9701a1e83cFariborz Jahanian } 70897a937532c24a8ea44317d4fdee26d9701a1e83cFariborz Jahanian 7091eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 71097a937532c24a8ea44317d4fdee26d9701a1e83cFariborz Jahanian if (VD->isThisDeclarationADefinition() != VarDecl::Definition) 71197a937532c24a8ea44317d4fdee26d9701a1e83cFariborz Jahanian return; 71297a937532c24a8ea44317d4fdee26d9701a1e83cFariborz Jahanian } 71397a937532c24a8ea44317d4fdee26d9701a1e83cFariborz Jahanian 71497a937532c24a8ea44317d4fdee26d9701a1e83cFariborz Jahanian // Defer code generation when possible if this is a static definition, inline 7151eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // function etc. These we only want to emit if they are used. 71697a937532c24a8ea44317d4fdee26d9701a1e83cFariborz Jahanian if (!MayDeferGeneration(Global)) { 71797a937532c24a8ea44317d4fdee26d9701a1e83cFariborz Jahanian // Emit the definition if it can't be deferred. 71897a937532c24a8ea44317d4fdee26d9701a1e83cFariborz Jahanian EmitGlobalDefinition(GD); 71997a937532c24a8ea44317d4fdee26d9701a1e83cFariborz Jahanian return; 72097a937532c24a8ea44317d4fdee26d9701a1e83cFariborz Jahanian } 72197a937532c24a8ea44317d4fdee26d9701a1e83cFariborz Jahanian 72297a937532c24a8ea44317d4fdee26d9701a1e83cFariborz Jahanian // If we're deferring emission of a C++ variable with an 7231eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // initializer, remember the order in which it appeared in the file. 72480e4b9e0e87064a824d72b6ff89074206ecced58Fariborz Jahanian if (getLangOptions().CPlusPlus && isa<VarDecl>(Global) && 72597a937532c24a8ea44317d4fdee26d9701a1e83cFariborz Jahanian cast<VarDecl>(Global)->hasInit()) { 72697a937532c24a8ea44317d4fdee26d9701a1e83cFariborz Jahanian DelayedCXXInitPosition[Global] = CXXGlobalInits.size(); 7271eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump CXXGlobalInits.push_back(0); 72897a937532c24a8ea44317d4fdee26d9701a1e83cFariborz Jahanian } 72997a937532c24a8ea44317d4fdee26d9701a1e83cFariborz Jahanian 73097a937532c24a8ea44317d4fdee26d9701a1e83cFariborz Jahanian // If the value has already been used, add it directly to the 73197a937532c24a8ea44317d4fdee26d9701a1e83cFariborz Jahanian // DeferredDeclsToEmit list. 73297a937532c24a8ea44317d4fdee26d9701a1e83cFariborz Jahanian llvm::StringRef MangledName = getMangledName(GD); 73397a937532c24a8ea44317d4fdee26d9701a1e83cFariborz Jahanian if (GetGlobalValue(MangledName)) 73497a937532c24a8ea44317d4fdee26d9701a1e83cFariborz Jahanian DeferredDeclsToEmit.push_back(GD); 735e64941280877d065a27e8cefd2a9038256d0e3acFariborz Jahanian else { 736e64941280877d065a27e8cefd2a9038256d0e3acFariborz Jahanian // Otherwise, remember that we saw a deferred decl with this name. The 73797a937532c24a8ea44317d4fdee26d9701a1e83cFariborz Jahanian // first use of the mangled name will cause it to move into 738e64941280877d065a27e8cefd2a9038256d0e3acFariborz Jahanian // DeferredDeclsToEmit. 7391eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump DeferredDecls[MangledName] = GD; 74080e4b9e0e87064a824d72b6ff89074206ecced58Fariborz Jahanian } 74197a937532c24a8ea44317d4fdee26d9701a1e83cFariborz Jahanian} 74297a937532c24a8ea44317d4fdee26d9701a1e83cFariborz Jahanian 74397a937532c24a8ea44317d4fdee26d9701a1e83cFariborz Jahanianvoid CodeGenModule::EmitGlobalDefinition(GlobalDecl GD) { 74497a937532c24a8ea44317d4fdee26d9701a1e83cFariborz Jahanian const ValueDecl *D = cast<ValueDecl>(GD.getDecl()); 745ad25883a644dd6b52c7923dd128a7d05fb26213cFariborz Jahanian 746ad25883a644dd6b52c7923dd128a7d05fb26213cFariborz Jahanian PrettyStackTraceDecl CrashInfo(const_cast<ValueDecl *>(D), D->getLocation(), 747ad25883a644dd6b52c7923dd128a7d05fb26213cFariborz Jahanian Context.getSourceManager(), 748ad25883a644dd6b52c7923dd128a7d05fb26213cFariborz Jahanian "Generating code for declaration"); 749ad25883a644dd6b52c7923dd128a7d05fb26213cFariborz Jahanian 750ad25883a644dd6b52c7923dd128a7d05fb26213cFariborz Jahanian if (const FunctionDecl *Function = dyn_cast<FunctionDecl>(D)) { 7511eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // At -O0, don't generate IR for functions with available_externally 752ad25883a644dd6b52c7923dd128a7d05fb26213cFariborz Jahanian // linkage. 753ad25883a644dd6b52c7923dd128a7d05fb26213cFariborz Jahanian if (CodeGenOpts.OptimizationLevel == 0 && 754ad25883a644dd6b52c7923dd128a7d05fb26213cFariborz Jahanian !Function->hasAttr<AlwaysInlineAttr>() && 7551eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump getFunctionLinkage(Function) 756ad25883a644dd6b52c7923dd128a7d05fb26213cFariborz Jahanian == llvm::Function::AvailableExternallyLinkage) 757ad25883a644dd6b52c7923dd128a7d05fb26213cFariborz Jahanian return; 758ad25883a644dd6b52c7923dd128a7d05fb26213cFariborz Jahanian 759ad25883a644dd6b52c7923dd128a7d05fb26213cFariborz Jahanian if (const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) { 760ad25883a644dd6b52c7923dd128a7d05fb26213cFariborz Jahanian if (Method->isVirtual()) 761ad25883a644dd6b52c7923dd128a7d05fb26213cFariborz Jahanian getVTables().EmitThunks(GD); 762ad25883a644dd6b52c7923dd128a7d05fb26213cFariborz Jahanian 763ad25883a644dd6b52c7923dd128a7d05fb26213cFariborz Jahanian if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(Method)) 764183d7181fd59842ac969cbc6fe0376f85dc63ae4Fariborz Jahanian return EmitCXXConstructor(CD, GD.getCtorType()); 765183d7181fd59842ac969cbc6fe0376f85dc63ae4Fariborz Jahanian 766183d7181fd59842ac969cbc6fe0376f85dc63ae4Fariborz Jahanian if (const CXXDestructorDecl *DD = dyn_cast<CXXDestructorDecl>(Method)) 767555b4bb2749aea2ec8e2adc351a71ec1cb9bdc33Anders Carlsson return EmitCXXDestructor(DD, GD.getDtorType()); 768ad25883a644dd6b52c7923dd128a7d05fb26213cFariborz Jahanian } 7691eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 770ad25883a644dd6b52c7923dd128a7d05fb26213cFariborz Jahanian return EmitGlobalFunctionDefinition(GD); 771ad25883a644dd6b52c7923dd128a7d05fb26213cFariborz Jahanian } 772ad25883a644dd6b52c7923dd128a7d05fb26213cFariborz Jahanian 773ad25883a644dd6b52c7923dd128a7d05fb26213cFariborz Jahanian if (const VarDecl *VD = dyn_cast<VarDecl>(D)) 774ad25883a644dd6b52c7923dd128a7d05fb26213cFariborz Jahanian return EmitGlobalVarDefinition(VD); 775ad25883a644dd6b52c7923dd128a7d05fb26213cFariborz Jahanian 776ad25883a644dd6b52c7923dd128a7d05fb26213cFariborz Jahanian assert(0 && "Invalid argument to EmitGlobalDefinition()"); 777ad25883a644dd6b52c7923dd128a7d05fb26213cFariborz Jahanian} 778ad25883a644dd6b52c7923dd128a7d05fb26213cFariborz Jahanian 779ad25883a644dd6b52c7923dd128a7d05fb26213cFariborz Jahanian/// GetOrCreateLLVMFunction - If the specified mangled name is not in the 780ad25883a644dd6b52c7923dd128a7d05fb26213cFariborz Jahanian/// module, create and return an llvm Function with the specified type. If there 781ad25883a644dd6b52c7923dd128a7d05fb26213cFariborz Jahanian/// is something in the module with the specified name, return it potentially 782183d7181fd59842ac969cbc6fe0376f85dc63ae4Fariborz Jahanian/// bitcasted to the right type. 783183d7181fd59842ac969cbc6fe0376f85dc63ae4Fariborz Jahanian/// 784183d7181fd59842ac969cbc6fe0376f85dc63ae4Fariborz Jahanian/// If D is non-null, it specifies a decl that correspond to this. This is used 785555b4bb2749aea2ec8e2adc351a71ec1cb9bdc33Anders Carlsson/// to set the attributes on the function when it is first created. 786ad25883a644dd6b52c7923dd128a7d05fb26213cFariborz Jahanianllvm::Constant * 787ad25883a644dd6b52c7923dd128a7d05fb26213cFariborz JahanianCodeGenModule::GetOrCreateLLVMFunction(llvm::StringRef MangledName, 7881eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump const llvm::Type *Ty, 78997a937532c24a8ea44317d4fdee26d9701a1e83cFariborz Jahanian GlobalDecl D) { 79097a937532c24a8ea44317d4fdee26d9701a1e83cFariborz Jahanian // Lookup the entry, lazily creating it if necessary. 791b193a414f13d7cfa2524a8149eff8d4871f8cbf6Fariborz Jahanian llvm::GlobalValue *Entry = GetGlobalValue(MangledName); 792b193a414f13d7cfa2524a8149eff8d4871f8cbf6Fariborz Jahanian if (Entry) { 793b193a414f13d7cfa2524a8149eff8d4871f8cbf6Fariborz Jahanian if (WeakRefReferences.count(Entry)) { 794b193a414f13d7cfa2524a8149eff8d4871f8cbf6Fariborz Jahanian const FunctionDecl *FD = cast_or_null<FunctionDecl>(D.getDecl()); 795b193a414f13d7cfa2524a8149eff8d4871f8cbf6Fariborz Jahanian if (FD && !FD->hasAttr<WeakAttr>()) 796b193a414f13d7cfa2524a8149eff8d4871f8cbf6Fariborz Jahanian Entry->setLinkage(llvm::Function::ExternalLinkage); 797b193a414f13d7cfa2524a8149eff8d4871f8cbf6Fariborz Jahanian 798b193a414f13d7cfa2524a8149eff8d4871f8cbf6Fariborz Jahanian WeakRefReferences.erase(Entry); 799b193a414f13d7cfa2524a8149eff8d4871f8cbf6Fariborz Jahanian } 800b193a414f13d7cfa2524a8149eff8d4871f8cbf6Fariborz Jahanian 801b193a414f13d7cfa2524a8149eff8d4871f8cbf6Fariborz Jahanian if (Entry->getType()->getElementType() == Ty) 8021eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump return Entry; 803b193a414f13d7cfa2524a8149eff8d4871f8cbf6Fariborz Jahanian 804b193a414f13d7cfa2524a8149eff8d4871f8cbf6Fariborz Jahanian // Make sure the result is of the correct type. 805b193a414f13d7cfa2524a8149eff8d4871f8cbf6Fariborz Jahanian const llvm::Type *PTy = llvm::PointerType::getUnqual(Ty); 8061eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump return llvm::ConstantExpr::getBitCast(Entry, PTy); 807b193a414f13d7cfa2524a8149eff8d4871f8cbf6Fariborz Jahanian } 808b193a414f13d7cfa2524a8149eff8d4871f8cbf6Fariborz Jahanian 809b193a414f13d7cfa2524a8149eff8d4871f8cbf6Fariborz Jahanian // This function doesn't have a complete type (for example, the return 810b193a414f13d7cfa2524a8149eff8d4871f8cbf6Fariborz Jahanian // type is an incomplete struct). Use a fake type instead, and make 811b193a414f13d7cfa2524a8149eff8d4871f8cbf6Fariborz Jahanian // sure not to try to set attributes. 812b193a414f13d7cfa2524a8149eff8d4871f8cbf6Fariborz Jahanian bool IsIncompleteFunction = false; 813b193a414f13d7cfa2524a8149eff8d4871f8cbf6Fariborz Jahanian 814b193a414f13d7cfa2524a8149eff8d4871f8cbf6Fariborz Jahanian const llvm::FunctionType *FTy; 815b193a414f13d7cfa2524a8149eff8d4871f8cbf6Fariborz Jahanian if (isa<llvm::FunctionType>(Ty)) { 816b193a414f13d7cfa2524a8149eff8d4871f8cbf6Fariborz Jahanian FTy = cast<llvm::FunctionType>(Ty); 817b193a414f13d7cfa2524a8149eff8d4871f8cbf6Fariborz Jahanian } else { 8181eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump FTy = llvm::FunctionType::get(llvm::Type::getVoidTy(VMContext), false); 819b193a414f13d7cfa2524a8149eff8d4871f8cbf6Fariborz Jahanian IsIncompleteFunction = true; 820b193a414f13d7cfa2524a8149eff8d4871f8cbf6Fariborz Jahanian } 821b193a414f13d7cfa2524a8149eff8d4871f8cbf6Fariborz Jahanian 822b193a414f13d7cfa2524a8149eff8d4871f8cbf6Fariborz Jahanian llvm::Function *F = llvm::Function::Create(FTy, 823b193a414f13d7cfa2524a8149eff8d4871f8cbf6Fariborz Jahanian llvm::Function::ExternalLinkage, 824b193a414f13d7cfa2524a8149eff8d4871f8cbf6Fariborz Jahanian MangledName, &getModule()); 825b193a414f13d7cfa2524a8149eff8d4871f8cbf6Fariborz Jahanian assert(F->getName() == MangledName && "name was uniqued!"); 826b193a414f13d7cfa2524a8149eff8d4871f8cbf6Fariborz Jahanian if (D.getDecl()) 82774391b48b4791cded373683a3baf67314f358d50Chris Lattner SetFunctionAttributes(D, F, IsIncompleteFunction); 82874391b48b4791cded373683a3baf67314f358d50Chris Lattner 82974391b48b4791cded373683a3baf67314f358d50Chris Lattner // This is the first use or definition of a mangled name. If there is a 830b4880bab7fc1b61267cfd9a0ad52188e7a828cb3Chris Lattner // deferred decl with this name, remember that we need to emit it at the end 83174391b48b4791cded373683a3baf67314f358d50Chris Lattner // of the file. 83274391b48b4791cded373683a3baf67314f358d50Chris Lattner llvm::StringMap<GlobalDecl>::iterator DDI = DeferredDecls.find(MangledName); 83374391b48b4791cded373683a3baf67314f358d50Chris Lattner if (DDI != DeferredDecls.end()) { 8344a6835e650ff24e19ce08a3bd347c0ad186777fdAnders Carlsson // Move the potentially referenced deferred decl to the DeferredDeclsToEmit 8354fe95f99a2693f1145785ea5835ba6937e49c730Douglas Gregor // list, and remove it from DeferredDecls (since we don't need it anymore). 83674391b48b4791cded373683a3baf67314f358d50Chris Lattner DeferredDeclsToEmit.push_back(DDI->second); 83777ba708819285931932ecd33691a672bb59d221aEli Friedman DeferredDecls.erase(DDI); 83874391b48b4791cded373683a3baf67314f358d50Chris Lattner 83974391b48b4791cded373683a3baf67314f358d50Chris Lattner // Otherwise, there are cases we have to worry about where we're 84074391b48b4791cded373683a3baf67314f358d50Chris Lattner // using a declaration for which we must emit a definition but where 84174391b48b4791cded373683a3baf67314f358d50Chris Lattner // we might not find a top-level definition: 84274391b48b4791cded373683a3baf67314f358d50Chris Lattner // - member functions defined inline in their classes 84374391b48b4791cded373683a3baf67314f358d50Chris Lattner // - friend functions defined inline in some class 844e013d685c6689ac7ae103ee88acf573422d1ed6aDaniel Dunbar // - special member functions with implicit definitions 845b4880bab7fc1b61267cfd9a0ad52188e7a828cb3Chris Lattner // If we ever change our AST traversal to walk into class methods, 84674391b48b4791cded373683a3baf67314f358d50Chris Lattner // this will be unnecessary. 847bd012ff1fa088181646a784f385b28867372d434Daniel Dunbar } else if (getLangOptions().CPlusPlus && D.getDecl()) { 84874391b48b4791cded373683a3baf67314f358d50Chris Lattner // Look for a declaration that's lexically in a record. 84974391b48b4791cded373683a3baf67314f358d50Chris Lattner const FunctionDecl *FD = cast<FunctionDecl>(D.getDecl()); 85074391b48b4791cded373683a3baf67314f358d50Chris Lattner do { 85174391b48b4791cded373683a3baf67314f358d50Chris Lattner if (isa<CXXRecordDecl>(FD->getLexicalDeclContext())) { 85274391b48b4791cded373683a3baf67314f358d50Chris Lattner if (FD->isImplicit()) { 85374391b48b4791cded373683a3baf67314f358d50Chris Lattner assert(FD->isUsed() && "Sema didn't mark implicit function as used!"); 85474391b48b4791cded373683a3baf67314f358d50Chris Lattner DeferredDeclsToEmit.push_back(D); 85574391b48b4791cded373683a3baf67314f358d50Chris Lattner break; 85674391b48b4791cded373683a3baf67314f358d50Chris Lattner } else if (FD->isThisDeclarationADefinition()) { 85774391b48b4791cded373683a3baf67314f358d50Chris Lattner DeferredDeclsToEmit.push_back(D); 8583c827a79cb7d04c255db8080e682ee2c6912373dDaniel Dunbar break; 8595d4f5c724533b994de05df49ae259120482ec366Chris Lattner } 86099b53613ebe2c59d41030e987962c1ed101b2efeChris Lattner } 86174391b48b4791cded373683a3baf67314f358d50Chris Lattner FD = FD->getPreviousDeclaration(); 862570585c91dee98d7ba8ccf1198c03208ba17966bChris Lattner } while (FD); 8631eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump } 86499b53613ebe2c59d41030e987962c1ed101b2efeChris Lattner 8653c4972def972f8ca44dcd0561779a12aaa6fec97Owen Anderson // Make sure the result is of the requested type. 86699b53613ebe2c59d41030e987962c1ed101b2efeChris Lattner if (!IsIncompleteFunction) { 8671eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump assert(F->getType()->getElementType() == Ty); 86867b00520c8f5b48fad722b790d87fea6be764efeChris Lattner return F; 86967b00520c8f5b48fad722b790d87fea6be764efeChris Lattner } 87067b00520c8f5b48fad722b790d87fea6be764efeChris Lattner 8711eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump const llvm::Type *PTy = llvm::PointerType::getUnqual(Ty); 87267b00520c8f5b48fad722b790d87fea6be764efeChris Lattner return llvm::ConstantExpr::getBitCast(F, PTy); 87367b00520c8f5b48fad722b790d87fea6be764efeChris Lattner} 87467b00520c8f5b48fad722b790d87fea6be764efeChris Lattner 87567b00520c8f5b48fad722b790d87fea6be764efeChris Lattner/// GetAddrOfFunction - Return the address of the given function. If Ty is 87667b00520c8f5b48fad722b790d87fea6be764efeChris Lattner/// non-null, then this function will use the specified type if it has to 87767b00520c8f5b48fad722b790d87fea6be764efeChris Lattner/// create it (this occurs when we see a definition of the function). 87867b00520c8f5b48fad722b790d87fea6be764efeChris Lattnerllvm::Constant *CodeGenModule::GetAddrOfFunction(GlobalDecl GD, 8791eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump const llvm::Type *Ty) { 8801eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // If there was no specific requested type, just convert it now. 8811eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump if (!Ty) 88299b53613ebe2c59d41030e987962c1ed101b2efeChris Lattner Ty = getTypes().ConvertType(cast<ValueDecl>(GD.getDecl())->getType()); 8831eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 88456ebe5082da7411fb37479e230b52735f77cff35Eli Friedman llvm::StringRef MangledName = getMangledName(GD); 885d972678a053d4785772b75cf6c8d4ab74ac2c7f6Chris Lattner return GetOrCreateLLVMFunction(MangledName, Ty, GD); 88649988884c1da4b2200bfe2298a1e41b3f044e8d4Daniel Dunbar} 88799b53613ebe2c59d41030e987962c1ed101b2efeChris Lattner 88874391b48b4791cded373683a3baf67314f358d50Chris Lattner/// CreateRuntimeFunction - Create a new runtime function with the specified 889f5408fe484495ee4efbdd709c8a2c2fdbbbdb328Mike Stump/// type and name. 890f5408fe484495ee4efbdd709c8a2c2fdbbbdb328Mike Stumpllvm::Constant * 89174391b48b4791cded373683a3baf67314f358d50Chris LattnerCodeGenModule::CreateRuntimeFunction(const llvm::FunctionType *FTy, 89249988884c1da4b2200bfe2298a1e41b3f044e8d4Daniel Dunbar llvm::StringRef Name) { 89374391b48b4791cded373683a3baf67314f358d50Chris Lattner return GetOrCreateLLVMFunction(Name, FTy, GlobalDecl()); 89474391b48b4791cded373683a3baf67314f358d50Chris Lattner} 89504d4078425614bf9fd58d606335c1f5f74ee7fa4Daniel Dunbar 89649988884c1da4b2200bfe2298a1e41b3f044e8d4Daniel Dunbarstatic bool DeclIsConstantGlobal(ASTContext &Context, const VarDecl *D) { 8971eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump if (!D->getType().isConstant(Context) && !D->getType()->isReferenceType()) 89840b598eea1310ec9ed554d56ce3e25b34c585458Argyrios Kyrtzidis return false; 89974391b48b4791cded373683a3baf67314f358d50Chris Lattner if (Context.getLangOptions().CPlusPlus && 90056ebe5082da7411fb37479e230b52735f77cff35Eli Friedman Context.getBaseElementType(D->getType())->getAs<RecordType>()) { 90156ebe5082da7411fb37479e230b52735f77cff35Eli Friedman // FIXME: We should do something fancier here! 90274391b48b4791cded373683a3baf67314f358d50Chris Lattner return false; 9031eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump } 90474391b48b4791cded373683a3baf67314f358d50Chris Lattner return true; 90574391b48b4791cded373683a3baf67314f358d50Chris Lattner} 906eda9a5ec380f172f4e0063744eb796144a125480Daniel Dunbar 907eda9a5ec380f172f4e0063744eb796144a125480Daniel Dunbar/// GetOrCreateLLVMGlobal - If the specified mangled name is not in the module, 90874391b48b4791cded373683a3baf67314f358d50Chris Lattner/// create and return an llvm GlobalVariable with the specified type. If there 90974391b48b4791cded373683a3baf67314f358d50Chris Lattner/// is something in the module with the specified name, return it potentially 91074391b48b4791cded373683a3baf67314f358d50Chris Lattner/// bitcasted to the right type. 91174391b48b4791cded373683a3baf67314f358d50Chris Lattner/// 91274391b48b4791cded373683a3baf67314f358d50Chris Lattner/// If D is non-null, it specifies a decl that correspond to this. This is used 91374391b48b4791cded373683a3baf67314f358d50Chris Lattner/// to set the attributes on the global when it is first created. 91474391b48b4791cded373683a3baf67314f358d50Chris Lattnerllvm::Constant * 91574391b48b4791cded373683a3baf67314f358d50Chris LattnerCodeGenModule::GetOrCreateLLVMGlobal(llvm::StringRef MangledName, 91674391b48b4791cded373683a3baf67314f358d50Chris Lattner const llvm::PointerType *Ty, 91774391b48b4791cded373683a3baf67314f358d50Chris Lattner const VarDecl *D, 9181eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump bool UnnamedAddr) { 9191eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // Lookup the entry, lazily creating it if necessary. 92096e0fc726c6fe7538522c60743705d5e696b40afOwen Anderson llvm::GlobalValue *Entry = GetGlobalValue(MangledName); 92174391b48b4791cded373683a3baf67314f358d50Chris Lattner if (Entry) { 92274391b48b4791cded373683a3baf67314f358d50Chris Lattner if (WeakRefReferences.count(Entry)) { 9233f75c43bd77e063342bc888ac276daf64ba0ce07Daniel Dunbar if (D && !D->hasAttr<WeakAttr>()) 92474391b48b4791cded373683a3baf67314f358d50Chris Lattner Entry->setLinkage(llvm::Function::ExternalLinkage); 92574391b48b4791cded373683a3baf67314f358d50Chris Lattner 92674391b48b4791cded373683a3baf67314f358d50Chris Lattner WeakRefReferences.erase(Entry); 92774391b48b4791cded373683a3baf67314f358d50Chris Lattner } 92874391b48b4791cded373683a3baf67314f358d50Chris Lattner 92974391b48b4791cded373683a3baf67314f358d50Chris Lattner if (UnnamedAddr) 930e013d685c6689ac7ae103ee88acf573422d1ed6aDaniel Dunbar Entry->setUnnamedAddr(true); 93196e0fc726c6fe7538522c60743705d5e696b40afOwen Anderson 932bd012ff1fa088181646a784f385b28867372d434Daniel Dunbar if (Entry->getType() == Ty) 933bd012ff1fa088181646a784f385b28867372d434Daniel Dunbar return Entry; 93403f5ad9a7707e098f601921fcec17ed65eb355a7Daniel Dunbar 93503f5ad9a7707e098f601921fcec17ed65eb355a7Daniel Dunbar // Make sure the result is of the correct type. 93603f5ad9a7707e098f601921fcec17ed65eb355a7Daniel Dunbar return llvm::ConstantExpr::getBitCast(Entry, Ty); 9377520bd1de12af10ea08c662440565adbdf589317Douglas Gregor } 9387520bd1de12af10ea08c662440565adbdf589317Douglas Gregor 9397520bd1de12af10ea08c662440565adbdf589317Douglas Gregor // This is the first use or definition of a mangled name. If there is a 9407520bd1de12af10ea08c662440565adbdf589317Douglas Gregor // deferred decl with this name, remember that we need to emit it at the end 9417520bd1de12af10ea08c662440565adbdf589317Douglas Gregor // of the file. 9427520bd1de12af10ea08c662440565adbdf589317Douglas Gregor llvm::StringMap<GlobalDecl>::iterator DDI = DeferredDecls.find(MangledName); 943555b4bb2749aea2ec8e2adc351a71ec1cb9bdc33Anders Carlsson if (DDI != DeferredDecls.end()) { 94403f5ad9a7707e098f601921fcec17ed65eb355a7Daniel Dunbar // Move the potentially referenced deferred decl to the DeferredDeclsToEmit 9457520bd1de12af10ea08c662440565adbdf589317Douglas Gregor // list, and remove it from DeferredDecls (since we don't need it anymore). 9467520bd1de12af10ea08c662440565adbdf589317Douglas Gregor DeferredDeclsToEmit.push_back(DDI->second); 9477520bd1de12af10ea08c662440565adbdf589317Douglas Gregor DeferredDecls.erase(DDI); 9487520bd1de12af10ea08c662440565adbdf589317Douglas Gregor } 94903f5ad9a7707e098f601921fcec17ed65eb355a7Daniel Dunbar 95003f5ad9a7707e098f601921fcec17ed65eb355a7Daniel Dunbar llvm::GlobalVariable *GV = 95103f5ad9a7707e098f601921fcec17ed65eb355a7Daniel Dunbar new llvm::GlobalVariable(getModule(), Ty->getElementType(), false, 9521028c9f0afc1cc5f4951b39b7067fa57c1fea07bDouglas Gregor llvm::GlobalValue::ExternalLinkage, 9531028c9f0afc1cc5f4951b39b7067fa57c1fea07bDouglas Gregor 0, MangledName, 0, 9541028c9f0afc1cc5f4951b39b7067fa57c1fea07bDouglas Gregor false, Ty->getAddressSpace()); 9551028c9f0afc1cc5f4951b39b7067fa57c1fea07bDouglas Gregor 9561028c9f0afc1cc5f4951b39b7067fa57c1fea07bDouglas Gregor // Handle things which are present even on external declarations. 9571028c9f0afc1cc5f4951b39b7067fa57c1fea07bDouglas Gregor if (D) { 9581028c9f0afc1cc5f4951b39b7067fa57c1fea07bDouglas Gregor // FIXME: This code is overly simple and should be merged with other global 9591028c9f0afc1cc5f4951b39b7067fa57c1fea07bDouglas Gregor // handling. 9601028c9f0afc1cc5f4951b39b7067fa57c1fea07bDouglas Gregor GV->setConstant(DeclIsConstantGlobal(Context, D)); 9611028c9f0afc1cc5f4951b39b7067fa57c1fea07bDouglas Gregor 9621028c9f0afc1cc5f4951b39b7067fa57c1fea07bDouglas Gregor // Set linkage and visibility in case we never see a definition. 9631028c9f0afc1cc5f4951b39b7067fa57c1fea07bDouglas Gregor NamedDecl::LinkageInfo LV = D->getLinkageAndVisibility(); 9641028c9f0afc1cc5f4951b39b7067fa57c1fea07bDouglas Gregor if (LV.linkage() != ExternalLinkage) { 9651028c9f0afc1cc5f4951b39b7067fa57c1fea07bDouglas Gregor GV->setLinkage(llvm::GlobalValue::InternalLinkage); 9661028c9f0afc1cc5f4951b39b7067fa57c1fea07bDouglas Gregor } else { 9671028c9f0afc1cc5f4951b39b7067fa57c1fea07bDouglas Gregor if (D->hasAttr<DLLImportAttr>()) 9689f0306d969700c9d79a31d559f95a1eb4c0bfcb4Douglas Gregor GV->setLinkage(llvm::GlobalValue::DLLImportLinkage); 9691028c9f0afc1cc5f4951b39b7067fa57c1fea07bDouglas Gregor else if (D->hasAttr<WeakAttr>() || D->hasAttr<WeakImportAttr>()) 9701028c9f0afc1cc5f4951b39b7067fa57c1fea07bDouglas Gregor GV->setLinkage(llvm::GlobalValue::ExternalWeakLinkage); 9711028c9f0afc1cc5f4951b39b7067fa57c1fea07bDouglas Gregor 9721028c9f0afc1cc5f4951b39b7067fa57c1fea07bDouglas Gregor // Set visibility on a declaration only if it's explicit. 9731028c9f0afc1cc5f4951b39b7067fa57c1fea07bDouglas Gregor if (LV.visibilityExplicit()) 9741028c9f0afc1cc5f4951b39b7067fa57c1fea07bDouglas Gregor GV->setVisibility(GetLLVMVisibility(LV.visibility())); 9751028c9f0afc1cc5f4951b39b7067fa57c1fea07bDouglas Gregor } 9761028c9f0afc1cc5f4951b39b7067fa57c1fea07bDouglas Gregor 9771028c9f0afc1cc5f4951b39b7067fa57c1fea07bDouglas Gregor GV->setThreadLocal(D->isThreadSpecified()); 9781028c9f0afc1cc5f4951b39b7067fa57c1fea07bDouglas Gregor } 9791028c9f0afc1cc5f4951b39b7067fa57c1fea07bDouglas Gregor 9801028c9f0afc1cc5f4951b39b7067fa57c1fea07bDouglas Gregor return GV; 9811028c9f0afc1cc5f4951b39b7067fa57c1fea07bDouglas Gregor} 9821028c9f0afc1cc5f4951b39b7067fa57c1fea07bDouglas Gregor 983bd012ff1fa088181646a784f385b28867372d434Daniel Dunbar 9848f32f7189b12f67aa4a19bc7c3855b599980eca0Chris Lattnerllvm::GlobalVariable * 98577ba708819285931932ecd33691a672bb59d221aEli FriedmanCodeGenModule::CreateOrReplaceCXXRuntimeVariable(llvm::StringRef Name, 9861eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump const llvm::Type *Ty, 9878f32f7189b12f67aa4a19bc7c3855b599980eca0Chris Lattner llvm::GlobalValue::LinkageTypes Linkage) { 988cd5f4aaf0c219189878126d556f35e38fdb8afa1Eli Friedman llvm::GlobalVariable *GV = getModule().getNamedGlobal(Name); 98903f5ad9a7707e098f601921fcec17ed65eb355a7Daniel Dunbar llvm::GlobalVariable *OldGV = 0; 99003f5ad9a7707e098f601921fcec17ed65eb355a7Daniel Dunbar 99103f5ad9a7707e098f601921fcec17ed65eb355a7Daniel Dunbar 99203f5ad9a7707e098f601921fcec17ed65eb355a7Daniel Dunbar if (GV) { 99303f5ad9a7707e098f601921fcec17ed65eb355a7Daniel Dunbar // Check if the variable has the right type. 99403f5ad9a7707e098f601921fcec17ed65eb355a7Daniel Dunbar if (GV->getType()->getElementType() == Ty) 99503f5ad9a7707e098f601921fcec17ed65eb355a7Daniel Dunbar return GV; 99603f5ad9a7707e098f601921fcec17ed65eb355a7Daniel Dunbar 99703f5ad9a7707e098f601921fcec17ed65eb355a7Daniel Dunbar // Because C++ name mangling, the only way we can end up with an already 998b0d0ea042116c1f451d3db8ceff9f1dd92bc36d2Anders Carlsson // existing global with the same name is if it has been declared extern "C". 99977ba708819285931932ecd33691a672bb59d221aEli Friedman assert(GV->isDeclaration() && "Declaration has wrong type!"); 1000e9352cc9818ba59e7cf88500ef048991c90f3821Anders Carlsson OldGV = GV; 10011eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump } 10026e656f45ae04b415ba7a4c0c25e55633e2d0ecd0Eli Friedman 10036e656f45ae04b415ba7a4c0c25e55633e2d0ecd0Eli Friedman // Create a new variable. 100489ed31d3f9eeb8ec77c284a5cf404a74bf5e7acfAnders Carlsson GV = new llvm::GlobalVariable(getModule(), Ty, /*isConstant=*/true, 100589ed31d3f9eeb8ec77c284a5cf404a74bf5e7acfAnders Carlsson Linkage, 0, Name); 100689ed31d3f9eeb8ec77c284a5cf404a74bf5e7acfAnders Carlsson 100789ed31d3f9eeb8ec77c284a5cf404a74bf5e7acfAnders Carlsson if (OldGV) { 100889ed31d3f9eeb8ec77c284a5cf404a74bf5e7acfAnders Carlsson // Replace occurrences of the old variable if needed. 100989ed31d3f9eeb8ec77c284a5cf404a74bf5e7acfAnders Carlsson GV->takeName(OldGV); 101089ed31d3f9eeb8ec77c284a5cf404a74bf5e7acfAnders Carlsson 10116e656f45ae04b415ba7a4c0c25e55633e2d0ecd0Eli Friedman if (!OldGV->use_empty()) { 10128f32f7189b12f67aa4a19bc7c3855b599980eca0Chris Lattner llvm::Constant *NewPtrForOldDecl = 10138e53e720b3d7c962e91138a130dbd5d6c2def0e5Devang Patel llvm::ConstantExpr::getBitCast(GV, OldGV->getType()); 10142d58406872e5af0c924623d9f7c194c4f09936d3Chris Lattner OldGV->replaceAllUsesWith(NewPtrForOldDecl); 1015570585c91dee98d7ba8ccf1198c03208ba17966bChris Lattner } 10161eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1017570585c91dee98d7ba8ccf1198c03208ba17966bChris Lattner OldGV->eraseFromParent(); 1018570585c91dee98d7ba8ccf1198c03208ba17966bChris Lattner } 10199d4a15fd3b85434c43ea27562793de63a793321aChris Lattner 10209d4a15fd3b85434c43ea27562793de63a793321aChris Lattner return GV; 10219d4a15fd3b85434c43ea27562793de63a793321aChris Lattner} 1022570585c91dee98d7ba8ccf1198c03208ba17966bChris Lattner 1023570585c91dee98d7ba8ccf1198c03208ba17966bChris Lattner/// GetAddrOfGlobalVar - Return the llvm::Constant for the address of the 10241eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump/// given global variable. If Ty is non-null and if the global doesn't exist, 1025570585c91dee98d7ba8ccf1198c03208ba17966bChris Lattner/// then it will be greated with the specified type instead of whatever the 1026570585c91dee98d7ba8ccf1198c03208ba17966bChris Lattner/// normal requested type would be. 10271eb4433ac451dc16f4133a88af2d002ac26c58efMike Stumpllvm::Constant *CodeGenModule::GetAddrOfGlobalVar(const VarDecl *D, 1028570585c91dee98d7ba8ccf1198c03208ba17966bChris Lattner const llvm::Type *Ty) { 1029570585c91dee98d7ba8ccf1198c03208ba17966bChris Lattner assert(D->hasGlobalStorage() && "Not a global variable"); 1030570585c91dee98d7ba8ccf1198c03208ba17966bChris Lattner QualType ASTTy = D->getType(); 1031570585c91dee98d7ba8ccf1198c03208ba17966bChris Lattner if (Ty == 0) 1032570585c91dee98d7ba8ccf1198c03208ba17966bChris Lattner Ty = getTypes().ConvertTypeForMem(ASTTy); 1033570585c91dee98d7ba8ccf1198c03208ba17966bChris Lattner 1034570585c91dee98d7ba8ccf1198c03208ba17966bChris Lattner const llvm::PointerType *PTy = 1035570585c91dee98d7ba8ccf1198c03208ba17966bChris Lattner llvm::PointerType::get(Ty, ASTTy.getAddressSpace()); 1036570585c91dee98d7ba8ccf1198c03208ba17966bChris Lattner 1037570585c91dee98d7ba8ccf1198c03208ba17966bChris Lattner llvm::StringRef MangledName = getMangledName(D); 1038570585c91dee98d7ba8ccf1198c03208ba17966bChris Lattner return GetOrCreateLLVMGlobal(MangledName, PTy, D); 1039570585c91dee98d7ba8ccf1198c03208ba17966bChris Lattner} 10401eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1041570585c91dee98d7ba8ccf1198c03208ba17966bChris Lattner/// CreateRuntimeVariable - Create a new runtime global variable with the 1042570585c91dee98d7ba8ccf1198c03208ba17966bChris Lattner/// specified type and name. 1043232350d4faf46ec38d5ff60e11505f9c4fa9535bDaniel Dunbarllvm::Constant * 1044570585c91dee98d7ba8ccf1198c03208ba17966bChris LattnerCodeGenModule::CreateRuntimeVariable(const llvm::Type *Ty, 1045570585c91dee98d7ba8ccf1198c03208ba17966bChris Lattner llvm::StringRef Name) { 10460558e79840bfdbbd38c6e2b4f6765bf0158e85f4Chris Lattner return GetOrCreateLLVMGlobal(Name, llvm::PointerType::getUnqual(Ty), 0, 10470558e79840bfdbbd38c6e2b4f6765bf0158e85f4Chris Lattner true); 104877ba708819285931932ecd33691a672bb59d221aEli Friedman} 10491eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 10503c4972def972f8ca44dcd0561779a12aaa6fec97Owen Andersonvoid CodeGenModule::EmitTentativeDefinition(const VarDecl *D) { 1051570585c91dee98d7ba8ccf1198c03208ba17966bChris Lattner assert(!D->getInit() && "Cannot emit definite definitions here!"); 105277ba708819285931932ecd33691a672bb59d221aEli Friedman 105377ba708819285931932ecd33691a672bb59d221aEli Friedman if (MayDeferGeneration(D)) { 1054570585c91dee98d7ba8ccf1198c03208ba17966bChris Lattner // If we have not seen a reference to this variable yet, place it 105577ba708819285931932ecd33691a672bb59d221aEli Friedman // into the deferred declarations table to be emitted if needed 105677ba708819285931932ecd33691a672bb59d221aEli Friedman // later. 105740b598eea1310ec9ed554d56ce3e25b34c585458Argyrios Kyrtzidis llvm::StringRef MangledName = getMangledName(D); 10588bd4afeb876fd0015bb808eb2f3de1fe709658a7Nate Begeman if (!GetGlobalValue(MangledName)) { 10598bd4afeb876fd0015bb808eb2f3de1fe709658a7Nate Begeman DeferredDecls[MangledName] = D; 1060f7cf85b330bedd2877e1371fb0a83e99751ae162Chris Lattner return; 10618bd4afeb876fd0015bb808eb2f3de1fe709658a7Nate Begeman } 10628bd4afeb876fd0015bb808eb2f3de1fe709658a7Nate Begeman } 106388a69ad80e1550e9932666e6efa050a5b1223889Chris Lattner 1064e78b86f3201ae5f09e2cf85bd6558f1d9b34de26Chris Lattner // The tentative definition is the only definition. 1065e78b86f3201ae5f09e2cf85bd6558f1d9b34de26Chris Lattner EmitGlobalVarDefinition(D); 1066e78b86f3201ae5f09e2cf85bd6558f1d9b34de26Chris Lattner} 1067e78b86f3201ae5f09e2cf85bd6558f1d9b34de26Chris Lattner 1068e78b86f3201ae5f09e2cf85bd6558f1d9b34de26Chris Lattnervoid CodeGenModule::EmitVTable(CXXRecordDecl *Class, bool DefinitionRequired) { 1069e78b86f3201ae5f09e2cf85bd6558f1d9b34de26Chris Lattner if (DefinitionRequired) 1070e78b86f3201ae5f09e2cf85bd6558f1d9b34de26Chris Lattner getVTables().GenerateClassData(getVTableLinkage(Class), Class); 1071e78b86f3201ae5f09e2cf85bd6558f1d9b34de26Chris Lattner} 10721eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 10730de40af3a3aa14e3854c0eafeabd08f6762801f9Eli Friedmanllvm::GlobalVariable::LinkageTypes 107408d7802a406ee4a7cc18e8fce0c137b8c410ea7cEli FriedmanCodeGenModule::getVTableLinkage(const CXXRecordDecl *RD) { 107588a69ad80e1550e9932666e6efa050a5b1223889Chris Lattner if (RD->isInAnonymousNamespace() || !RD->hasLinkage()) 10761028c9f0afc1cc5f4951b39b7067fa57c1fea07bDouglas Gregor return llvm::GlobalVariable::InternalLinkage; 1077a0f00a71fcb0f98298709d5e5318339acf7958acDouglas Gregor 10788fabd78f1976243cb223fb3e969c6f317d1ae44dChris Lattner if (const CXXMethodDecl *KeyFunction 107940b598eea1310ec9ed554d56ce3e25b34c585458Argyrios Kyrtzidis = RD->getASTContext().getKeyFunction(RD)) { 1080ddee4231e9bdfbac1e1f5385ff1a17fd0e0b0e39Chris Lattner // If this class has a key function, use that to determine the linkage of 108140b598eea1310ec9ed554d56ce3e25b34c585458Argyrios Kyrtzidis // the vtable. 1082ddee4231e9bdfbac1e1f5385ff1a17fd0e0b0e39Chris Lattner const FunctionDecl *Def = 0; 1083e78b86f3201ae5f09e2cf85bd6558f1d9b34de26Chris Lattner if (KeyFunction->hasBody(Def)) 1084e78b86f3201ae5f09e2cf85bd6558f1d9b34de26Chris Lattner KeyFunction = cast<CXXMethodDecl>(Def); 1085e78b86f3201ae5f09e2cf85bd6558f1d9b34de26Chris Lattner 1086e78b86f3201ae5f09e2cf85bd6558f1d9b34de26Chris Lattner switch (KeyFunction->getTemplateSpecializationKind()) { 1087e78b86f3201ae5f09e2cf85bd6558f1d9b34de26Chris Lattner case TSK_Undeclared: 10881028c9f0afc1cc5f4951b39b7067fa57c1fea07bDouglas Gregor case TSK_ExplicitSpecialization: 10891028c9f0afc1cc5f4951b39b7067fa57c1fea07bDouglas Gregor // When compiling with optimizations turned on, we emit all vtables, 10902811ccf48d6d898c42cc4cfad37abedb36236d20Chandler Carruth // even if the key function is not defined in the current translation 1091309457d0f1b416c1b379c9f3e172848adffedb23Chris Lattner // unit. If this is the case, use available_externally linkage. 1092e78b86f3201ae5f09e2cf85bd6558f1d9b34de26Chris Lattner if (!Def && CodeGenOpts.OptimizationLevel) 109304d4078425614bf9fd58d606335c1f5f74ee7fa4Daniel Dunbar return llvm::GlobalVariable::AvailableExternallyLinkage; 1094e78b86f3201ae5f09e2cf85bd6558f1d9b34de26Chris Lattner 1095e78b86f3201ae5f09e2cf85bd6558f1d9b34de26Chris Lattner if (KeyFunction->isInlined()) 1096e78b86f3201ae5f09e2cf85bd6558f1d9b34de26Chris Lattner return !Context.getLangOptions().AppleKext ? 109704d4078425614bf9fd58d606335c1f5f74ee7fa4Daniel Dunbar llvm::GlobalVariable::LinkOnceODRLinkage : 10987e714cd931fa3a90bfd728318a92485aa3e95748Daniel Dunbar llvm::Function::InternalLinkage; 10997c65e990e9f0dafaf9adbc59b766dcc23eaee845Daniel Dunbar 110004d4078425614bf9fd58d606335c1f5f74ee7fa4Daniel Dunbar return llvm::GlobalVariable::ExternalLinkage; 1101686226b538e72c5059ab7c9a8f87eb883193b645Sanjiv Gupta 11022d58406872e5af0c924623d9f7c194c4f09936d3Chris Lattner case TSK_ImplicitInstantiation: 110366031a5594bc9a7dc0dc5137c3e7955f835e4639Daniel Dunbar return !Context.getLangOptions().AppleKext ? 1104686226b538e72c5059ab7c9a8f87eb883193b645Sanjiv Gupta llvm::GlobalVariable::LinkOnceODRLinkage : 1105686226b538e72c5059ab7c9a8f87eb883193b645Sanjiv Gupta llvm::Function::InternalLinkage; 110688a69ad80e1550e9932666e6efa050a5b1223889Chris Lattner 11075f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case TSK_ExplicitInstantiationDefinition: 1108bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner return !Context.getLangOptions().AppleKext ? 1109bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner llvm::GlobalVariable::WeakODRLinkage : 1110bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner llvm::Function::InternalLinkage; 1111bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner 1112bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner case TSK_ExplicitInstantiationDeclaration: 1113bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner // FIXME: Use available_externally linkage. However, this currently 1114bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner // breaks LLVM's build due to undefined symbols. 1115bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner // return llvm::GlobalVariable::AvailableExternallyLinkage; 1116bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner return !Context.getLangOptions().AppleKext ? 1117bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner llvm::GlobalVariable::LinkOnceODRLinkage : 1118bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner llvm::Function::InternalLinkage; 1119bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner } 1120bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner } 1121bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner 11221eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump if (Context.getLangOptions().AppleKext) 1123bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner return llvm::Function::InternalLinkage; 1124bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner 1125bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner switch (RD->getTemplateSpecializationKind()) { 1126bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner case TSK_Undeclared: 1127bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner case TSK_ExplicitSpecialization: 1128bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner case TSK_ImplicitInstantiation: 112908c93a7f2210b464e5abe298a5474b99414615f6Chris Lattner // FIXME: Use available_externally linkage. However, this currently 1130bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner // breaks LLVM's build due to undefined symbols. 113108c93a7f2210b464e5abe298a5474b99414615f6Chris Lattner // return llvm::GlobalVariable::AvailableExternallyLinkage; 11321eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump case TSK_ExplicitInstantiationDeclaration: 1133bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner return llvm::GlobalVariable::LinkOnceODRLinkage; 1134bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner 1135bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner case TSK_ExplicitInstantiationDefinition: 1136bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner return llvm::GlobalVariable::WeakODRLinkage; 1137bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner } 1138bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner 1139bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner // Silence GCC warning. 1140bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner return llvm::GlobalVariable::LinkOnceODRLinkage; 1141bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner} 1142bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner 1143bdb0132722082886558f31eccdba06ae1852c0eeChris LattnerCharUnits CodeGenModule::GetTargetTypeStoreSize(const llvm::Type *Ty) const { 1144bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner return Context.toCharUnitsFromBits( 1145bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner TheTargetData.getTypeStoreSizeInBits(Ty)); 1146bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner} 1147bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner 1148bdb0132722082886558f31eccdba06ae1852c0eeChris Lattnervoid CodeGenModule::EmitGlobalVarDefinition(const VarDecl *D) { 1149bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner llvm::Constant *Init = 0; 1150bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner QualType ASTTy = D->getType(); 1151bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner bool NonConstInit = false; 1152bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner 11531eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump const Expr *InitExpr = D->getAnyInitializer(); 1154bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner 1155bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner if (!InitExpr) { 1156bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner // This is a tentative definition; tentative definitions are 1157bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner // implicitly initialized with { 0 }. 1158bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner // 1159bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner // Note that tentative definitions are only emitted at the end of 1160ffbb15e54a6dc120087003d1e42448b8705bd58aBenjamin Kramer // a translation unit, so they should never have incomplete 1161bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner // type. In addition, EmitTentativeDefinition makes sure that we 1162bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner // never attempt to emit a tentative definition if a real one 1163ca6408c3176783f0b29da4679a08512aa05f0c73Daniel Dunbar // exists. A use may still exists, however, so we still may need 1164bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner // to do a RAUW. 1165bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner assert(!ASTTy->isIncompleteType() && "Unexpected incomplete type"); 116600549fcec0490b2daf27543e532f94adbb186063Chris Lattner Init = EmitNullConstant(D->getType()); 116700549fcec0490b2daf27543e532f94adbb186063Chris Lattner } else { 11683b122bc5f1203615e2128e0c1a63da438865b1ccDevang Patel Init = EmitConstantExpr(InitExpr, D->getType()); 1169aa40454a14837c573f323e29269cc0b53f495a13Devang Patel if (!Init) { 1170aa40454a14837c573f323e29269cc0b53f495a13Devang Patel QualType T = InitExpr->getType(); 1171aa40454a14837c573f323e29269cc0b53f495a13Devang Patel if (D->getType()->isReferenceType()) 1172aa40454a14837c573f323e29269cc0b53f495a13Devang Patel T = D->getType(); 1173bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner 1174bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner if (getLangOptions().CPlusPlus) { 1175bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner Init = EmitNullConstant(T); 1176bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner NonConstInit = true; 1177bd012ff1fa088181646a784f385b28867372d434Daniel Dunbar } else { 1178b4880bab7fc1b61267cfd9a0ad52188e7a828cb3Chris Lattner ErrorUnsupported(D, "static initializer"); 11792b77ba8bc7a842829ad9193816dc1d7d5e9c5be6Anders Carlsson Init = llvm::UndefValue::get(getTypes().ConvertType(T)); 1180b4880bab7fc1b61267cfd9a0ad52188e7a828cb3Chris Lattner } 11811eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump } else { 11822b77ba8bc7a842829ad9193816dc1d7d5e9c5be6Anders Carlsson // We don't need an initializer, so remove the entry for the delayed 1183183700f494ec9b6701b6efe82bcb25f4c79ba561John McCall // initializer position (just in case this entry was delayed). 11841eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump if (getLangOptions().CPlusPlus) 11852b77ba8bc7a842829ad9193816dc1d7d5e9c5be6Anders Carlsson DelayedCXXInitPosition.erase(D); 11862b77ba8bc7a842829ad9193816dc1d7d5e9c5be6Anders Carlsson } 11872b77ba8bc7a842829ad9193816dc1d7d5e9c5be6Anders Carlsson } 11881eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 11892b77ba8bc7a842829ad9193816dc1d7d5e9c5be6Anders Carlsson const llvm::Type* InitType = Init->getType(); 11902b77ba8bc7a842829ad9193816dc1d7d5e9c5be6Anders Carlsson llvm::Constant *Entry = GetAddrOfGlobalVar(D, InitType); 11912b77ba8bc7a842829ad9193816dc1d7d5e9c5be6Anders Carlsson 11922b77ba8bc7a842829ad9193816dc1d7d5e9c5be6Anders Carlsson // Strip off a bitcast if we got one back. 11932b77ba8bc7a842829ad9193816dc1d7d5e9c5be6Anders Carlsson if (llvm::ConstantExpr *CE = dyn_cast<llvm::ConstantExpr>(Entry)) { 11941eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump assert(CE->getOpcode() == llvm::Instruction::BitCast || 11951eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // all zero index gep. 11962b77ba8bc7a842829ad9193816dc1d7d5e9c5be6Anders Carlsson CE->getOpcode() == llvm::Instruction::GetElementPtr); 11972b77ba8bc7a842829ad9193816dc1d7d5e9c5be6Anders Carlsson Entry = CE->getOperand(0); 119896e0fc726c6fe7538522c60743705d5e696b40afOwen Anderson } 11992b77ba8bc7a842829ad9193816dc1d7d5e9c5be6Anders Carlsson 1200ff75e1db95a53c7606e0bb114cf9adc59ab3d7f6Chris Lattner // Entry is now either a Function or GlobalVariable. 1201d5d31801fc87239436fa349c89dce7797cf13537Daniel Dunbar llvm::GlobalVariable *GV = dyn_cast<llvm::GlobalVariable>(Entry); 12029fa959d5bfbbb17d7c6ba71252219201fc8dc971Chris Lattner 1203b4880bab7fc1b61267cfd9a0ad52188e7a828cb3Chris Lattner // We have a definition after a declaration with the wrong type. 12041eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // We must make a new GlobalVariable* and update everything that used OldGV 12050558e79840bfdbbd38c6e2b4f6765bf0158e85f4Chris Lattner // (a declaration or tentative definition) with the new GlobalVariable* 12060558e79840bfdbbd38c6e2b4f6765bf0158e85f4Chris Lattner // (which will be a definition). 12070558e79840bfdbbd38c6e2b4f6765bf0158e85f4Chris Lattner // 12080558e79840bfdbbd38c6e2b4f6765bf0158e85f4Chris Lattner // This happens if there is a prototype for a global (e.g. 12090558e79840bfdbbd38c6e2b4f6765bf0158e85f4Chris Lattner // "extern int x[];") and then a definition of a different type (e.g. 12101eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // "int x[10];"). This also happens when an initializer has a different type 12111eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // from the type of the global (this happens with unions). 12120558e79840bfdbbd38c6e2b4f6765bf0158e85f4Chris Lattner if (GV == 0 || 1213bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner GV->getType()->getElementType() != InitType || 12141eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump GV->getType()->getAddressSpace() != ASTTy.getAddressSpace()) { 121542745815fa4e90bfb07e581d2e5152b2c2db08ffDaniel Dunbar 1216bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner // Move the old entry aside so that we'll create a new one. 12170558e79840bfdbbd38c6e2b4f6765bf0158e85f4Chris Lattner Entry->setName(llvm::StringRef()); 121834809507232bc4c3c4840c7d092c7440219fddafChris Lattner 121962b33ea51adbd0e7f2f05983e9e4a3a2b2ed26deChris Lattner // Make a new global with the correct type, this is now guaranteed to work. 122062b33ea51adbd0e7f2f05983e9e4a3a2b2ed26deChris Lattner GV = cast<llvm::GlobalVariable>(GetAddrOfGlobalVar(D, InitType)); 122162b33ea51adbd0e7f2f05983e9e4a3a2b2ed26deChris Lattner 122262b33ea51adbd0e7f2f05983e9e4a3a2b2ed26deChris Lattner // Replace all uses of the old global with the new global 122362b33ea51adbd0e7f2f05983e9e4a3a2b2ed26deChris Lattner llvm::Constant *NewPtrForOldDecl = 122462b33ea51adbd0e7f2f05983e9e4a3a2b2ed26deChris Lattner llvm::ConstantExpr::getBitCast(GV, Entry->getType()); 122562b33ea51adbd0e7f2f05983e9e4a3a2b2ed26deChris Lattner Entry->replaceAllUsesWith(NewPtrForOldDecl); 122662b33ea51adbd0e7f2f05983e9e4a3a2b2ed26deChris Lattner 122734809507232bc4c3c4840c7d092c7440219fddafChris Lattner // Erase the old global, since it is no longer used. 1228b4880bab7fc1b61267cfd9a0ad52188e7a828cb3Chris Lattner cast<llvm::GlobalValue>(Entry)->eraseFromParent(); 1229bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner } 12301eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1231bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner if (const AnnotateAttr *AA = D->getAttr<AnnotateAttr>()) { 1232bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner SourceManager &SM = Context.getSourceManager(); 1233bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner AddAnnotation(EmitAnnotateAttr(GV, AA, 12349fa959d5bfbbb17d7c6ba71252219201fc8dc971Chris Lattner SM.getInstantiationLineNumber(D->getLocation()))); 1235bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner } 12369fa959d5bfbbb17d7c6ba71252219201fc8dc971Chris Lattner 12379fa959d5bfbbb17d7c6ba71252219201fc8dc971Chris Lattner GV->setInitializer(Init); 12381eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 123962b33ea51adbd0e7f2f05983e9e4a3a2b2ed26deChris Lattner // If it is safe to mark the global 'constant', do so now. 1240bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner GV->setConstant(false); 12411eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump if (!NonConstInit && DeclIsConstantGlobal(Context, D)) 12423c4972def972f8ca44dcd0561779a12aaa6fec97Owen Anderson GV->setConstant(true); 1243bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner 1244bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner GV->setAlignment(getContext().getDeclAlign(D).getQuantity()); 12451eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 124662b33ea51adbd0e7f2f05983e9e4a3a2b2ed26deChris Lattner // Set the llvm linkage type as appropriate. 1247bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner llvm::GlobalValue::LinkageTypes Linkage = 12481eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump GetLLVMLinkageVarDefinition(D, GV); 12490558e79840bfdbbd38c6e2b4f6765bf0158e85f4Chris Lattner GV->setLinkage(Linkage); 1250bd012ff1fa088181646a784f385b28867372d434Daniel Dunbar if (Linkage == llvm::GlobalVariable::CommonLinkage) 12511eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // common vars aren't constant even if declared const. 12520558e79840bfdbbd38c6e2b4f6765bf0158e85f4Chris Lattner GV->setConstant(false); 1253bd012ff1fa088181646a784f385b28867372d434Daniel Dunbar 1254219df6644e2338ff067471ab0d85f27b88544ac2Daniel Dunbar SetCommonAttributes(D, GV); 12556379a7a15335e0af543a942efe9cfd514a83dab8Daniel Dunbar 12567c65e990e9f0dafaf9adbc59b766dcc23eaee845Daniel Dunbar // Emit the initializer function if necessary. 12577c65e990e9f0dafaf9adbc59b766dcc23eaee845Daniel Dunbar if (NonConstInit) 12581eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump EmitCXXGlobalVarDeclInitFunc(D, GV); 125940b598eea1310ec9ed554d56ce3e25b34c585458Argyrios Kyrtzidis 1260219df6644e2338ff067471ab0d85f27b88544ac2Daniel Dunbar // Emit global variable debug information. 126140b598eea1310ec9ed554d56ce3e25b34c585458Argyrios Kyrtzidis if (CGDebugInfo *DI = getDebugInfo()) { 1262219df6644e2338ff067471ab0d85f27b88544ac2Daniel Dunbar DI->setLocation(D->getLocation()); 1263bd012ff1fa088181646a784f385b28867372d434Daniel Dunbar DI->EmitGlobalVariable(GV, D); 1264bd012ff1fa088181646a784f385b28867372d434Daniel Dunbar } 1265bd53271dc7570b54f7b7cab7b09bcf04c6e927f6Chris Lattner} 126640b598eea1310ec9ed554d56ce3e25b34c585458Argyrios Kyrtzidis 1267bd53271dc7570b54f7b7cab7b09bcf04c6e927f6Chris Lattnerllvm::GlobalValue::LinkageTypes 1268bd53271dc7570b54f7b7cab7b09bcf04c6e927f6Chris LattnerCodeGenModule::GetLLVMLinkageVarDefinition(const VarDecl *D, 1269bd53271dc7570b54f7b7cab7b09bcf04c6e927f6Chris Lattner llvm::GlobalVariable *GV) { 12701eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump GVALinkage Linkage = getContext().GetGVALinkageForVariable(D); 1271bd53271dc7570b54f7b7cab7b09bcf04c6e927f6Chris Lattner if (Linkage == GVA_Internal) 1272bd53271dc7570b54f7b7cab7b09bcf04c6e927f6Chris Lattner return llvm::Function::InternalLinkage; 1273e013d685c6689ac7ae103ee88acf573422d1ed6aDaniel Dunbar else if (D->hasAttr<DLLImportAttr>()) 1274bd53271dc7570b54f7b7cab7b09bcf04c6e927f6Chris Lattner return llvm::Function::DLLImportLinkage; 1275bd53271dc7570b54f7b7cab7b09bcf04c6e927f6Chris Lattner else if (D->hasAttr<DLLExportAttr>()) 1276bd53271dc7570b54f7b7cab7b09bcf04c6e927f6Chris Lattner return llvm::Function::DLLExportLinkage; 1277bd53271dc7570b54f7b7cab7b09bcf04c6e927f6Chris Lattner else if (D->hasAttr<WeakAttr>()) { 1278bd53271dc7570b54f7b7cab7b09bcf04c6e927f6Chris Lattner if (GV->isConstant()) 1279b4880bab7fc1b61267cfd9a0ad52188e7a828cb3Chris Lattner return llvm::GlobalVariable::WeakODRLinkage; 1280bd53271dc7570b54f7b7cab7b09bcf04c6e927f6Chris Lattner else 1281bd53271dc7570b54f7b7cab7b09bcf04c6e927f6Chris Lattner return llvm::GlobalVariable::WeakAnyLinkage; 128296e0fc726c6fe7538522c60743705d5e696b40afOwen Anderson } else if (Linkage == GVA_TemplateInstantiation || 1283bd53271dc7570b54f7b7cab7b09bcf04c6e927f6Chris Lattner Linkage == GVA_ExplicitTemplateInstantiation) 1284bd53271dc7570b54f7b7cab7b09bcf04c6e927f6Chris Lattner // FIXME: It seems like we can provide more specific linkage here 12851eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // (LinkOnceODR, WeakODR). 1286bd53271dc7570b54f7b7cab7b09bcf04c6e927f6Chris Lattner return llvm::GlobalVariable::WeakAnyLinkage; 1287bd53271dc7570b54f7b7cab7b09bcf04c6e927f6Chris Lattner else if (!getLangOptions().CPlusPlus && 1288bd53271dc7570b54f7b7cab7b09bcf04c6e927f6Chris Lattner ((!CodeGenOpts.NoCommon && !D->getAttr<NoCommonAttr>()) || 12891eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump D->getAttr<CommonAttr>()) && 1290bd53271dc7570b54f7b7cab7b09bcf04c6e927f6Chris Lattner !D->hasExternalStorage() && !D->getInit() && 1291bd53271dc7570b54f7b7cab7b09bcf04c6e927f6Chris Lattner !D->getAttr<SectionAttr>() && !D->isThreadSpecified()) { 1292bd53271dc7570b54f7b7cab7b09bcf04c6e927f6Chris Lattner // Thread local vars aren't considered common linkage. 12931eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump return llvm::GlobalVariable::CommonLinkage; 1294bd53271dc7570b54f7b7cab7b09bcf04c6e927f6Chris Lattner } 1295bd53271dc7570b54f7b7cab7b09bcf04c6e927f6Chris Lattner return llvm::GlobalVariable::ExternalLinkage; 1296bd53271dc7570b54f7b7cab7b09bcf04c6e927f6Chris Lattner} 1297bd53271dc7570b54f7b7cab7b09bcf04c6e927f6Chris Lattner 1298bd53271dc7570b54f7b7cab7b09bcf04c6e927f6Chris Lattner/// ReplaceUsesOfNonProtoTypeWithRealFunction - This function is called when we 1299bd53271dc7570b54f7b7cab7b09bcf04c6e927f6Chris Lattner/// implement a function with no prototype, e.g. "int foo() {}". If there are 13001eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump/// existing call uses of the old function in the module, this adjusts them to 1301bd53271dc7570b54f7b7cab7b09bcf04c6e927f6Chris Lattner/// call the new function directly. 1302bd53271dc7570b54f7b7cab7b09bcf04c6e927f6Chris Lattner/// 1303bd53271dc7570b54f7b7cab7b09bcf04c6e927f6Chris Lattner/// This is not just a cleanup: the always_inline pass requires direct calls to 1304bd53271dc7570b54f7b7cab7b09bcf04c6e927f6Chris Lattner/// functions to be able to inline them. If there is a bitcast in the way, it 1305bd53271dc7570b54f7b7cab7b09bcf04c6e927f6Chris Lattner/// won't inline them. Instcombine normally deletes these calls, but it isn't 1306bd53271dc7570b54f7b7cab7b09bcf04c6e927f6Chris Lattner/// run at -O0. 1307bd53271dc7570b54f7b7cab7b09bcf04c6e927f6Chris Lattnerstatic void ReplaceUsesOfNonProtoTypeWithRealFunction(llvm::GlobalValue *Old, 1308bd53271dc7570b54f7b7cab7b09bcf04c6e927f6Chris Lattner llvm::Function *NewFn) { 13091eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // If we're redefining a global as a function, don't transform it. 13103c4972def972f8ca44dcd0561779a12aaa6fec97Owen Anderson llvm::Function *OldFn = dyn_cast<llvm::Function>(Old); 1311bd53271dc7570b54f7b7cab7b09bcf04c6e927f6Chris Lattner if (OldFn == 0) return; 1312bd53271dc7570b54f7b7cab7b09bcf04c6e927f6Chris Lattner 1313bd53271dc7570b54f7b7cab7b09bcf04c6e927f6Chris Lattner const llvm::Type *NewRetTy = NewFn->getReturnType(); 13141eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump llvm::SmallVector<llvm::Value*, 4> ArgList; 1315bd53271dc7570b54f7b7cab7b09bcf04c6e927f6Chris Lattner 1316bd53271dc7570b54f7b7cab7b09bcf04c6e927f6Chris Lattner for (llvm::Value::use_iterator UI = OldFn->use_begin(), E = OldFn->use_end(); 1317bd53271dc7570b54f7b7cab7b09bcf04c6e927f6Chris Lattner UI != E; ) { 1318bd53271dc7570b54f7b7cab7b09bcf04c6e927f6Chris Lattner // TODO: Do invokes ever occur in C code? If so, we should handle them too. 13197c65e990e9f0dafaf9adbc59b766dcc23eaee845Daniel Dunbar llvm::Value::use_iterator I = UI++; // Increment before the CI is erased. 13207c65e990e9f0dafaf9adbc59b766dcc23eaee845Daniel Dunbar llvm::CallInst *CI = dyn_cast<llvm::CallInst>(*I); 13217c65e990e9f0dafaf9adbc59b766dcc23eaee845Daniel Dunbar if (!CI) continue; // FIXME: when we allow Invoke, just do CallSite CS(*I) 132240b598eea1310ec9ed554d56ce3e25b34c585458Argyrios Kyrtzidis llvm::CallSite CS(CI); 13237c65e990e9f0dafaf9adbc59b766dcc23eaee845Daniel Dunbar if (!CI || !CS.isCallee(I)) continue; 13247c65e990e9f0dafaf9adbc59b766dcc23eaee845Daniel Dunbar 13256fb0aee4f9dc261bbec72e1283ad8dc0557a6d96Argyrios Kyrtzidis // If the return types don't match exactly, and if the call isn't dead, then 13267c65e990e9f0dafaf9adbc59b766dcc23eaee845Daniel Dunbar // we can't transform this call. 13277c65e990e9f0dafaf9adbc59b766dcc23eaee845Daniel Dunbar if (CI->getType() != NewRetTy && !CI->use_empty()) 13287c65e990e9f0dafaf9adbc59b766dcc23eaee845Daniel Dunbar continue; 13297c65e990e9f0dafaf9adbc59b766dcc23eaee845Daniel Dunbar 13301eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // If the function was passed too few arguments, don't transform. If extra 133140b598eea1310ec9ed554d56ce3e25b34c585458Argyrios Kyrtzidis // arguments were passed, we silently drop them. If any of the types 13327c65e990e9f0dafaf9adbc59b766dcc23eaee845Daniel Dunbar // mismatch, we don't transform. 13337c65e990e9f0dafaf9adbc59b766dcc23eaee845Daniel Dunbar unsigned ArgNo = 0; 13347c65e990e9f0dafaf9adbc59b766dcc23eaee845Daniel Dunbar bool DontTransform = false; 13357c65e990e9f0dafaf9adbc59b766dcc23eaee845Daniel Dunbar for (llvm::Function::arg_iterator AI = NewFn->arg_begin(), 1336bd53271dc7570b54f7b7cab7b09bcf04c6e927f6Chris Lattner E = NewFn->arg_end(); AI != E; ++AI, ++ArgNo) { 1337bd53271dc7570b54f7b7cab7b09bcf04c6e927f6Chris Lattner if (CS.arg_size() == ArgNo || 1338b808c952bbff821dce727dd801a1098d64394f98Chris Lattner CS.getArgument(ArgNo)->getType() != AI->getType()) { 1339b808c952bbff821dce727dd801a1098d64394f98Chris Lattner DontTransform = true; 134034771b594ca8cdf8cd2e40b27170efa4ed2833c5Daniel Dunbar break; 134134771b594ca8cdf8cd2e40b27170efa4ed2833c5Daniel Dunbar } 13423e41d60eb627dc227c770f1c1c87d06909cf05fdDouglas Gregor } 13431eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump if (DontTransform) 13443e41d60eb627dc227c770f1c1c87d06909cf05fdDouglas Gregor continue; 13451eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 13463e41d60eb627dc227c770f1c1c87d06909cf05fdDouglas Gregor // Okay, we can transform this. Create the new call instruction and copy 13473e41d60eb627dc227c770f1c1c87d06909cf05fdDouglas Gregor // over the required information. 13483e41d60eb627dc227c770f1c1c87d06909cf05fdDouglas Gregor ArgList.append(CS.arg_begin(), CS.arg_begin() + ArgNo); 13493e41d60eb627dc227c770f1c1c87d06909cf05fdDouglas Gregor llvm::CallInst *NewCall = llvm::CallInst::Create(NewFn, ArgList.begin(), 13501eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump ArgList.end(), "", CI); 1351bef20ac367a09555b30d6eb3847a81ec164caf88Chris Lattner ArgList.clear(); 135286df27bbdbb98c39ec2184695c0561209f91beddChris Lattner if (!NewCall->getType()->isVoidTy()) 135386df27bbdbb98c39ec2184695c0561209f91beddChris Lattner NewCall->takeName(CI); 135486df27bbdbb98c39ec2184695c0561209f91beddChris Lattner NewCall->setAttributes(CI->getAttributes()); 1355370ab3f1373841d70582feac9e35c3c6b3489f63Douglas Gregor NewCall->setCallingConv(CI->getCallingConv()); 13561eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1357bef20ac367a09555b30d6eb3847a81ec164caf88Chris Lattner // Finally, remove the old call, replacing any uses with the new one. 1358bef20ac367a09555b30d6eb3847a81ec164caf88Chris Lattner if (!CI->use_empty()) 1359b808c952bbff821dce727dd801a1098d64394f98Chris Lattner CI->replaceAllUsesWith(NewCall); 1360e013d685c6689ac7ae103ee88acf573422d1ed6aDaniel Dunbar 136134771b594ca8cdf8cd2e40b27170efa4ed2833c5Daniel Dunbar // Copy debug location attached to CI. 1362bef20ac367a09555b30d6eb3847a81ec164caf88Chris Lattner if (!CI->getDebugLoc().isUnknown()) 1363bef20ac367a09555b30d6eb3847a81ec164caf88Chris Lattner NewCall->setDebugLoc(CI->getDebugLoc()); 13647acda7c4a0e4aec6c003b3169ca45a5f3bc7e033Chris Lattner CI->eraseFromParent(); 13657acda7c4a0e4aec6c003b3169ca45a5f3bc7e033Chris Lattner } 13667acda7c4a0e4aec6c003b3169ca45a5f3bc7e033Chris Lattner} 13677acda7c4a0e4aec6c003b3169ca45a5f3bc7e033Chris Lattner 13687acda7c4a0e4aec6c003b3169ca45a5f3bc7e033Chris Lattner 1369bef20ac367a09555b30d6eb3847a81ec164caf88Chris Lattnervoid CodeGenModule::EmitGlobalFunctionDefinition(GlobalDecl GD) { 13705f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer const FunctionDecl *D = cast<FunctionDecl>(GD.getDecl()); 13715f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer const llvm::FunctionType *Ty = getTypes().GetFunctionType(GD); 13720032b2781b4deb131f8c9b7968f2030bf2489cddOwen Anderson // Get or create the prototype for the function. 13734e8a9e8640a6717120394ee2ee5f27989757754dChris Lattner llvm::Constant *Entry = GetAddrOfFunction(GD, Ty); 13745f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 1375c9e2091efcb535110474434dd12015afdc3b1637Anders Carlsson // Strip off a bitcast if we got one back. 13760c99509927a0c7a48490486b9fec287b63e5c09cEli Friedman if (llvm::ConstantExpr *CE = dyn_cast<llvm::ConstantExpr>(Entry)) { 13770c99509927a0c7a48490486b9fec287b63e5c09cEli Friedman assert(CE->getOpcode() == llvm::Instruction::BitCast); 13780032b2781b4deb131f8c9b7968f2030bf2489cddOwen Anderson Entry = CE->getOperand(0); 13794e8a9e8640a6717120394ee2ee5f27989757754dChris Lattner } 13800c99509927a0c7a48490486b9fec287b63e5c09cEli Friedman 13810c99509927a0c7a48490486b9fec287b63e5c09cEli Friedman 138241ef30e869d3f4940437503eb6a2cf70819fdb08Lauro Ramos Venancio if (cast<llvm::GlobalValue>(Entry)->getType()->getElementType() != Ty) { 138341ef30e869d3f4940437503eb6a2cf70819fdb08Lauro Ramos Venancio llvm::GlobalValue *OldFn = cast<llvm::GlobalValue>(Entry); 13840032b2781b4deb131f8c9b7968f2030bf2489cddOwen Anderson 13854e8a9e8640a6717120394ee2ee5f27989757754dChris Lattner // If the types mismatch then we have to rewrite the definition. 138641ef30e869d3f4940437503eb6a2cf70819fdb08Lauro Ramos Venancio assert(OldFn->isDeclaration() && 13877acda7c4a0e4aec6c003b3169ca45a5f3bc7e033Chris Lattner "Shouldn't replace non-declaration"); 13881d5529132e4620562cab931c1f84c24e42f02741Daniel Dunbar 13891d5529132e4620562cab931c1f84c24e42f02741Daniel Dunbar // F is the Function* for the one with the wrong type, we must make a new 13901d5529132e4620562cab931c1f84c24e42f02741Daniel Dunbar // Function* and update everything that used F (a declaration) with the new 139170ee975fad4653fa09f8e77f9a46a7b1f592ef59Daniel Dunbar // Function* (which will be a definition). 13921d5529132e4620562cab931c1f84c24e42f02741Daniel Dunbar // 13931d5529132e4620562cab931c1f84c24e42f02741Daniel Dunbar // This happens if there is a prototype for a function 1394df4eee9b035cc4b95b1ea72635e7429d06b0ecc8Daniel Dunbar // (e.g. "int f()") and then a definition of a different type 13951d5529132e4620562cab931c1f84c24e42f02741Daniel Dunbar // (e.g. "int f(int x)"). Move the old function aside so that it 1396f015b034159d40e7033309e50036804eb1971787Daniel Dunbar // doesn't interfere with GetAddrOfFunction. 1397f015b034159d40e7033309e50036804eb1971787Daniel Dunbar OldFn->setName(llvm::StringRef()); 1398f015b034159d40e7033309e50036804eb1971787Daniel Dunbar llvm::Function *NewFn = cast<llvm::Function>(GetAddrOfFunction(GD, Ty)); 1399f015b034159d40e7033309e50036804eb1971787Daniel Dunbar 1400f015b034159d40e7033309e50036804eb1971787Daniel Dunbar // If this is an implementation of a function without a prototype, try to 1401f015b034159d40e7033309e50036804eb1971787Daniel Dunbar // replace any existing uses of the function (which may be calls) with uses 1402f015b034159d40e7033309e50036804eb1971787Daniel Dunbar // of the new function 14031d5529132e4620562cab931c1f84c24e42f02741Daniel Dunbar if (D->getType()->isFunctionNoProtoType()) { 14041d5529132e4620562cab931c1f84c24e42f02741Daniel Dunbar ReplaceUsesOfNonProtoTypeWithRealFunction(OldFn, NewFn); 14051d5529132e4620562cab931c1f84c24e42f02741Daniel Dunbar OldFn->removeDeadConstantUsers(); 14061d5529132e4620562cab931c1f84c24e42f02741Daniel Dunbar } 14071eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 14081eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // Replace uses of F with the Function we will endow with a body. 14091d5529132e4620562cab931c1f84c24e42f02741Daniel Dunbar if (!Entry->use_empty()) { 14101d5529132e4620562cab931c1f84c24e42f02741Daniel Dunbar llvm::Constant *NewPtrForOldDecl = 14111eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump llvm::ConstantExpr::getBitCast(NewFn, Entry->getType()); 14121d5529132e4620562cab931c1f84c24e42f02741Daniel Dunbar Entry->replaceAllUsesWith(NewPtrForOldDecl); 14131d5529132e4620562cab931c1f84c24e42f02741Daniel Dunbar } 14141d5529132e4620562cab931c1f84c24e42f02741Daniel Dunbar 14151d5529132e4620562cab931c1f84c24e42f02741Daniel Dunbar // Ok, delete the old function now, which is dead. 14161d5529132e4620562cab931c1f84c24e42f02741Daniel Dunbar OldFn->eraseFromParent(); 1417f015b034159d40e7033309e50036804eb1971787Daniel Dunbar 1418f015b034159d40e7033309e50036804eb1971787Daniel Dunbar Entry = NewFn; 1419f015b034159d40e7033309e50036804eb1971787Daniel Dunbar } 1420e9b7d8ace8674585818990cff585daae7745bd88Steve Naroff 14211d5529132e4620562cab931c1f84c24e42f02741Daniel Dunbar // We need to set linkage and visibility on the function before 142270ee975fad4653fa09f8e77f9a46a7b1f592ef59Daniel Dunbar // generating code for it because various parts of IR generation 14231d5529132e4620562cab931c1f84c24e42f02741Daniel Dunbar // want to propagate this information down (e.g. to local static 142470ee975fad4653fa09f8e77f9a46a7b1f592ef59Daniel Dunbar // declarations). 142570ee975fad4653fa09f8e77f9a46a7b1f592ef59Daniel Dunbar llvm::Function *Fn = cast<llvm::Function>(Entry); 142670ee975fad4653fa09f8e77f9a46a7b1f592ef59Daniel Dunbar setFunctionLinkage(D, Fn); 142770ee975fad4653fa09f8e77f9a46a7b1f592ef59Daniel Dunbar 142870ee975fad4653fa09f8e77f9a46a7b1f592ef59Daniel Dunbar // FIXME: this is redundant with part of SetFunctionDefinitionAttributes 142970ee975fad4653fa09f8e77f9a46a7b1f592ef59Daniel Dunbar setGlobalVisibility(Fn, D); 143070ee975fad4653fa09f8e77f9a46a7b1f592ef59Daniel Dunbar 143170ee975fad4653fa09f8e77f9a46a7b1f592ef59Daniel Dunbar CodeGenFunction(*this).GenerateCode(D, Fn); 143270ee975fad4653fa09f8e77f9a46a7b1f592ef59Daniel Dunbar 143370ee975fad4653fa09f8e77f9a46a7b1f592ef59Daniel Dunbar SetFunctionDefinitionAttributes(D, Fn); 143470ee975fad4653fa09f8e77f9a46a7b1f592ef59Daniel Dunbar SetLLVMFunctionAttributesForDefinition(D, Fn); 143570ee975fad4653fa09f8e77f9a46a7b1f592ef59Daniel Dunbar 143670ee975fad4653fa09f8e77f9a46a7b1f592ef59Daniel Dunbar if (const ConstructorAttr *CA = D->getAttr<ConstructorAttr>()) 143770ee975fad4653fa09f8e77f9a46a7b1f592ef59Daniel Dunbar AddGlobalCtor(Fn, CA->getPriority()); 143870ee975fad4653fa09f8e77f9a46a7b1f592ef59Daniel Dunbar if (const DestructorAttr *DA = D->getAttr<DestructorAttr>()) 143970ee975fad4653fa09f8e77f9a46a7b1f592ef59Daniel Dunbar AddGlobalDtor(Fn, DA->getPriority()); 144070ee975fad4653fa09f8e77f9a46a7b1f592ef59Daniel Dunbar} 1441434da48d0e35764f18b3fc96c75504746050b046Daniel Dunbar 1442434da48d0e35764f18b3fc96c75504746050b046Daniel Dunbarvoid CodeGenModule::EmitAliasDefinition(GlobalDecl GD) { 1443434da48d0e35764f18b3fc96c75504746050b046Daniel Dunbar const ValueDecl *D = cast<ValueDecl>(GD.getDecl()); 144470ee975fad4653fa09f8e77f9a46a7b1f592ef59Daniel Dunbar const AliasAttr *AA = D->getAttr<AliasAttr>(); 14451d5529132e4620562cab931c1f84c24e42f02741Daniel Dunbar assert(AA && "Not an alias?"); 144670ee975fad4653fa09f8e77f9a46a7b1f592ef59Daniel Dunbar 14471d5529132e4620562cab931c1f84c24e42f02741Daniel Dunbar llvm::StringRef MangledName = getMangledName(GD); 14481d5529132e4620562cab931c1f84c24e42f02741Daniel Dunbar 14491d5529132e4620562cab931c1f84c24e42f02741Daniel Dunbar // If there is a definition in the module, then it wins over the alias. 14501d5529132e4620562cab931c1f84c24e42f02741Daniel Dunbar // This is dubious, but allow it to be safe. Just ignore the alias. 14511d5529132e4620562cab931c1f84c24e42f02741Daniel Dunbar llvm::GlobalValue *Entry = GetGlobalValue(MangledName); 14521d5529132e4620562cab931c1f84c24e42f02741Daniel Dunbar if (Entry && !Entry->isDeclaration()) 14531d5529132e4620562cab931c1f84c24e42f02741Daniel Dunbar return; 14541eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 145570ee975fad4653fa09f8e77f9a46a7b1f592ef59Daniel Dunbar const llvm::Type *DeclTy = getTypes().ConvertTypeForMem(D->getType()); 145670ee975fad4653fa09f8e77f9a46a7b1f592ef59Daniel Dunbar 14571eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // Create a reference to the named value. This ensures that it is emitted 14581d5529132e4620562cab931c1f84c24e42f02741Daniel Dunbar // if a deferred decl. 14591d5529132e4620562cab931c1f84c24e42f02741Daniel Dunbar llvm::Constant *Aliasee; 14601eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump if (isa<llvm::FunctionType>(DeclTy)) 14610032b2781b4deb131f8c9b7968f2030bf2489cddOwen Anderson Aliasee = GetOrCreateLLVMFunction(AA->getAliasee(), DeclTy, GlobalDecl()); 14620032b2781b4deb131f8c9b7968f2030bf2489cddOwen Anderson else 14633e9df9920db8de8ec93a424b0c1784f9bff301eaDaniel Dunbar Aliasee = GetOrCreateLLVMGlobal(AA->getAliasee(), 14641eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump llvm::PointerType::getUnqual(DeclTy), 0); 14659d4a15fd3b85434c43ea27562793de63a793321aChris Lattner 1466c9e2091efcb535110474434dd12015afdc3b1637Anders Carlsson // Create the new alias itself, but don't set a name yet. 1467c9e2091efcb535110474434dd12015afdc3b1637Anders Carlsson llvm::GlobalValue *GA = 146896e0fc726c6fe7538522c60743705d5e696b40afOwen Anderson new llvm::GlobalAlias(Aliasee->getType(), 14691eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump llvm::Function::ExternalLinkage, 14709d4a15fd3b85434c43ea27562793de63a793321aChris Lattner "", Aliasee, &getModule()); 14713e9df9920db8de8ec93a424b0c1784f9bff301eaDaniel Dunbar 14723e9df9920db8de8ec93a424b0c1784f9bff301eaDaniel Dunbar if (Entry) { 14733c4972def972f8ca44dcd0561779a12aaa6fec97Owen Anderson assert(Entry->isDeclaration()); 1474c9e2091efcb535110474434dd12015afdc3b1637Anders Carlsson 14751eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // If there is a declaration in the module, then we had an extern followed 1476e3daa761061982f2267f7c8fb847ea02abad0aa9Anders Carlsson // by the alias, as in: 14773e9df9920db8de8ec93a424b0c1784f9bff301eaDaniel Dunbar // extern int test6(); 14781eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // ... 1479e3daa761061982f2267f7c8fb847ea02abad0aa9Anders Carlsson // int test6() __attribute__((alias("test7"))); 1480e3daa761061982f2267f7c8fb847ea02abad0aa9Anders Carlsson // 14815add6835b0c6b0f67e19fd5366825d3e41eb0dcfAnders Carlsson // Remove it and replace uses of it with the alias. 148244b4321feab46299d3f5cfd404680884752a0fcfDouglas Gregor GA->takeName(Entry); 1483c9e2091efcb535110474434dd12015afdc3b1637Anders Carlsson 14845add6835b0c6b0f67e19fd5366825d3e41eb0dcfAnders Carlsson Entry->replaceAllUsesWith(llvm::ConstantExpr::getBitCast(GA, 14851eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump Entry->getType())); 1486c9e2091efcb535110474434dd12015afdc3b1637Anders Carlsson Entry->eraseFromParent(); 14873e9df9920db8de8ec93a424b0c1784f9bff301eaDaniel Dunbar } else { 14881eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump GA->setName(MangledName); 14895add6835b0c6b0f67e19fd5366825d3e41eb0dcfAnders Carlsson } 14905add6835b0c6b0f67e19fd5366825d3e41eb0dcfAnders Carlsson 1491c9e2091efcb535110474434dd12015afdc3b1637Anders Carlsson // Set attributes which are particular to an alias; this is a 14920032b2781b4deb131f8c9b7968f2030bf2489cddOwen Anderson // specialization of the attributes which may be set on a global 1493a9668e0b4c451a1021fe650c451b54dc98c2d18dDaniel Dunbar // variable/function. 1494278b9f06933c385ffbccc15f8491787470cb4a1bChris Lattner if (D->hasAttr<DLLExportAttr>()) { 149595b851e55c328af4b69da7bfc1124bf258c0ffe5Chris Lattner if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 1496278b9f06933c385ffbccc15f8491787470cb4a1bChris Lattner // The dllexport attribute is ignored for undefined symbols. 1497a9668e0b4c451a1021fe650c451b54dc98c2d18dDaniel Dunbar if (FD->hasBody()) 1498a9668e0b4c451a1021fe650c451b54dc98c2d18dDaniel Dunbar GA->setLinkage(llvm::Function::DLLExportLinkage); 1499278b9f06933c385ffbccc15f8491787470cb4a1bChris Lattner } else { 150095b851e55c328af4b69da7bfc1124bf258c0ffe5Chris Lattner GA->setLinkage(llvm::Function::DLLExportLinkage); 1501278b9f06933c385ffbccc15f8491787470cb4a1bChris Lattner } 1502278b9f06933c385ffbccc15f8491787470cb4a1bChris Lattner } else if (D->hasAttr<WeakAttr>() || 1503278b9f06933c385ffbccc15f8491787470cb4a1bChris Lattner D->hasAttr<WeakRefAttr>() || 1504a9668e0b4c451a1021fe650c451b54dc98c2d18dDaniel Dunbar D->hasAttr<WeakImportAttr>()) { 150595b851e55c328af4b69da7bfc1124bf258c0ffe5Chris Lattner GA->setLinkage(llvm::Function::WeakAnyLinkage); 1506278b9f06933c385ffbccc15f8491787470cb4a1bChris Lattner } 1507a9668e0b4c451a1021fe650c451b54dc98c2d18dDaniel Dunbar 1508278b9f06933c385ffbccc15f8491787470cb4a1bChris Lattner SetCommonAttributes(D, GA); 15091eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump} 1510278b9f06933c385ffbccc15f8491787470cb4a1bChris Lattner 1511278b9f06933c385ffbccc15f8491787470cb4a1bChris Lattner/// getBuiltinLibFunction - Given a builtin id for a function like 1512a9668e0b4c451a1021fe650c451b54dc98c2d18dDaniel Dunbar/// "__builtin_fabsf", return a Function* for "fabsf". 15138e5c2b8072f4409c7c0004331d1db9652d5209c0Daniel Dunbarllvm::Value *CodeGenModule::getBuiltinLibFunction(const FunctionDecl *FD, 1514a9668e0b4c451a1021fe650c451b54dc98c2d18dDaniel Dunbar unsigned BuiltinID) { 1515a9668e0b4c451a1021fe650c451b54dc98c2d18dDaniel Dunbar assert((Context.BuiltinInfo.isLibFunction(BuiltinID) || 15161eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) && 1517a9668e0b4c451a1021fe650c451b54dc98c2d18dDaniel Dunbar "isn't a lib fn"); 15185add6835b0c6b0f67e19fd5366825d3e41eb0dcfAnders Carlsson 15195add6835b0c6b0f67e19fd5366825d3e41eb0dcfAnders Carlsson // Get the name, skip over the __builtin_ prefix (if necessary). 1520c9e2091efcb535110474434dd12015afdc3b1637Anders Carlsson const char *Name = Context.BuiltinInfo.GetName(BuiltinID); 1521c9e2091efcb535110474434dd12015afdc3b1637Anders Carlsson if (Context.BuiltinInfo.isLibFunction(BuiltinID)) 15225add6835b0c6b0f67e19fd5366825d3e41eb0dcfAnders Carlsson Name += 10; 15231eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1524c9e2091efcb535110474434dd12015afdc3b1637Anders Carlsson const llvm::FunctionType *Ty = 152508e252425ca2cbdc44ba65d9a657ed5398014e36Owen Anderson cast<llvm::FunctionType>(getTypes().ConvertType(FD->getType())); 15261eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 15271eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump return GetOrCreateLLVMFunction(Name, Ty, GlobalDecl(FD)); 152895b851e55c328af4b69da7bfc1124bf258c0ffe5Chris Lattner} 15298e5c2b8072f4409c7c0004331d1db9652d5209c0Daniel Dunbar 15308e5c2b8072f4409c7c0004331d1db9652d5209c0Daniel Dunbarllvm::Function *CodeGenModule::getIntrinsic(unsigned IID,const llvm::Type **Tys, 15311d5529132e4620562cab931c1f84c24e42f02741Daniel Dunbar unsigned NumTys) { 15321eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump return llvm::Intrinsic::getDeclaration(&getModule(), 15330c67829763b98bc670062b553897a851fab17401Anders Carlsson (llvm::Intrinsic::ID)IID, Tys, NumTys); 1534c9e2091efcb535110474434dd12015afdc3b1637Anders Carlsson} 153545e8cbdce25c2e16c7aac2036a591f6190097ae6Chris Lattner 15366143293fa4366ee95d7e47e61bd030a34bf68b55Daniel Dunbarstatic llvm::StringMapEntry<llvm::Constant*> & 15371e04976fc2611d8cc06986a81deed4c42183b870Daniel DunbarGetConstantCFStringEntry(llvm::StringMap<llvm::Constant*> &Map, 15386143293fa4366ee95d7e47e61bd030a34bf68b55Daniel Dunbar const StringLiteral *Literal, 15391e04976fc2611d8cc06986a81deed4c42183b870Daniel Dunbar bool TargetIsLSB, 15401e04976fc2611d8cc06986a81deed4c42183b870Daniel Dunbar bool &IsUTF16, 15411e04976fc2611d8cc06986a81deed4c42183b870Daniel Dunbar unsigned &StringLength) { 15421e04976fc2611d8cc06986a81deed4c42183b870Daniel Dunbar llvm::StringRef String = Literal->getString(); 15431e04976fc2611d8cc06986a81deed4c42183b870Daniel Dunbar unsigned NumBytes = String.size(); 15441e04976fc2611d8cc06986a81deed4c42183b870Daniel Dunbar 15451eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // Check for simple case. 1546dbb1ecc32ca122b07b7c98fd0a8f6f53985adaccChris Lattner if (!Literal->containsNonAsciiOrNull()) { 15471e04976fc2611d8cc06986a81deed4c42183b870Daniel Dunbar StringLength = NumBytes; 15481e04976fc2611d8cc06986a81deed4c42183b870Daniel Dunbar return Map.GetOrCreateValue(String); 15491eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump } 1550dbb1ecc32ca122b07b7c98fd0a8f6f53985adaccChris Lattner 1551dbb1ecc32ca122b07b7c98fd0a8f6f53985adaccChris Lattner // Otherwise, convert the UTF8 literals into a byte string. 15521eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump llvm::SmallVector<UTF16, 128> ToBuf(NumBytes); 15531e04976fc2611d8cc06986a81deed4c42183b870Daniel Dunbar const UTF8 *FromPtr = (UTF8 *)String.data(); 15541eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump UTF16 *ToPtr = &ToBuf[0]; 15551e04976fc2611d8cc06986a81deed4c42183b870Daniel Dunbar 15561e04976fc2611d8cc06986a81deed4c42183b870Daniel Dunbar (void)ConvertUTF8toUTF16(&FromPtr, FromPtr + NumBytes, 15571e04976fc2611d8cc06986a81deed4c42183b870Daniel Dunbar &ToPtr, ToPtr + NumBytes, 15586143293fa4366ee95d7e47e61bd030a34bf68b55Daniel Dunbar strictConversion); 15596143293fa4366ee95d7e47e61bd030a34bf68b55Daniel Dunbar 15606143293fa4366ee95d7e47e61bd030a34bf68b55Daniel Dunbar // ConvertUTF8toUTF16 returns the length in ToPtr. 15616143293fa4366ee95d7e47e61bd030a34bf68b55Daniel Dunbar StringLength = ToPtr - &ToBuf[0]; 15626143293fa4366ee95d7e47e61bd030a34bf68b55Daniel Dunbar 15637eb79c1010c8d30b852768bec96e81cd3e6def2eEli Friedman // Render the UTF-16 string into a byte array and convert to the target byte 15647eb79c1010c8d30b852768bec96e81cd3e6def2eEli Friedman // order. 15657eb79c1010c8d30b852768bec96e81cd3e6def2eEli Friedman // 15667eb79c1010c8d30b852768bec96e81cd3e6def2eEli Friedman // FIXME: This isn't something we should need to do here. 15677eb79c1010c8d30b852768bec96e81cd3e6def2eEli Friedman llvm::SmallString<128> AsBytes; 15687eb79c1010c8d30b852768bec96e81cd3e6def2eEli Friedman AsBytes.reserve(StringLength * 2); 15697eb79c1010c8d30b852768bec96e81cd3e6def2eEli Friedman for (unsigned i = 0; i != StringLength; ++i) { 15707eb79c1010c8d30b852768bec96e81cd3e6def2eEli Friedman unsigned short Val = ToBuf[i]; 15716143293fa4366ee95d7e47e61bd030a34bf68b55Daniel Dunbar if (TargetIsLSB) { 15726143293fa4366ee95d7e47e61bd030a34bf68b55Daniel Dunbar AsBytes.push_back(Val & 0xFF); 1573eaf2bb89eb2aad3b80673de30febe52df43c10ecChris Lattner AsBytes.push_back(Val >> 8); 1574eaf2bb89eb2aad3b80673de30febe52df43c10ecChris Lattner } else { 1575eaf2bb89eb2aad3b80673de30febe52df43c10ecChris Lattner AsBytes.push_back(Val >> 8); 1576eaf2bb89eb2aad3b80673de30febe52df43c10ecChris Lattner AsBytes.push_back(Val & 0xFF); 1577eaf2bb89eb2aad3b80673de30febe52df43c10ecChris Lattner } 1578eaf2bb89eb2aad3b80673de30febe52df43c10ecChris Lattner } 1579a210f350fa78c263caa26e0f999cce85bb235309Eli Friedman // Append one extra null character, the second is automatically added by our 1580a210f350fa78c263caa26e0f999cce85bb235309Eli Friedman // caller. 1581eaf2bb89eb2aad3b80673de30febe52df43c10ecChris Lattner AsBytes.push_back(0); 1582eaf2bb89eb2aad3b80673de30febe52df43c10ecChris Lattner 1583eaf2bb89eb2aad3b80673de30febe52df43c10ecChris Lattner IsUTF16 = true; 1584a7ad98ff0919d6a24ea7c46634ea29bea551c1a0Chris Lattner return Map.GetOrCreateValue(llvm::StringRef(AsBytes.data(), AsBytes.size())); 15851eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump} 158645e8cbdce25c2e16c7aac2036a591f6190097ae6Chris Lattner 15875fabf9dbee29464bcd06cd09f8e569d1b850f948Daniel Dunbarllvm::Constant * 15885fabf9dbee29464bcd06cd09f8e569d1b850f948Daniel DunbarCodeGenModule::GetAddrOfConstantCFString(const StringLiteral *Literal) { 15896143293fa4366ee95d7e47e61bd030a34bf68b55Daniel Dunbar unsigned StringLength = 0; 15900032b2781b4deb131f8c9b7968f2030bf2489cddOwen Anderson bool isUTF16 = false; 15910032b2781b4deb131f8c9b7968f2030bf2489cddOwen Anderson llvm::StringMapEntry<llvm::Constant*> &Entry = 15921eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump GetConstantCFStringEntry(CFConstantStringMap, Literal, 159345e8cbdce25c2e16c7aac2036a591f6190097ae6Chris Lattner getTargetData().isLittleEndian(), 15941eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump isUTF16, StringLength); 159595b851e55c328af4b69da7bfc1124bf258c0ffe5Chris Lattner 15961c431b323d776362490bbf7cc796b74fedaf19f2Owen Anderson if (llvm::Constant *C = Entry.getValue()) 159745e8cbdce25c2e16c7aac2036a591f6190097ae6Chris Lattner return C; 159845e8cbdce25c2e16c7aac2036a591f6190097ae6Chris Lattner 15996143293fa4366ee95d7e47e61bd030a34bf68b55Daniel Dunbar llvm::Constant *Zero = 16006143293fa4366ee95d7e47e61bd030a34bf68b55Daniel Dunbar llvm::Constant::getNullValue(llvm::Type::getInt32Ty(VMContext)); 16016143293fa4366ee95d7e47e61bd030a34bf68b55Daniel Dunbar llvm::Constant *Zeros[] = { Zero, Zero }; 16026143293fa4366ee95d7e47e61bd030a34bf68b55Daniel Dunbar 16036143293fa4366ee95d7e47e61bd030a34bf68b55Daniel Dunbar // If we don't already have it, get __CFConstantStringClassReference. 16046143293fa4366ee95d7e47e61bd030a34bf68b55Daniel Dunbar if (!CFConstantStringClassRef) { 16056143293fa4366ee95d7e47e61bd030a34bf68b55Daniel Dunbar const llvm::Type *Ty = getTypes().ConvertType(getContext().IntTy); 16066143293fa4366ee95d7e47e61bd030a34bf68b55Daniel Dunbar Ty = llvm::ArrayType::get(Ty, 0); 16075fabf9dbee29464bcd06cd09f8e569d1b850f948Daniel Dunbar llvm::Constant *GV = CreateRuntimeVariable(Ty, 16085fabf9dbee29464bcd06cd09f8e569d1b850f948Daniel Dunbar "__CFConstantStringClassReference"); 16098e5c2b8072f4409c7c0004331d1db9652d5209c0Daniel Dunbar // Decay array -> ptr 16108e5c2b8072f4409c7c0004331d1db9652d5209c0Daniel Dunbar CFConstantStringClassRef = 16118e5c2b8072f4409c7c0004331d1db9652d5209c0Daniel Dunbar llvm::ConstantExpr::getGetElementPtr(GV, Zeros, 2); 16128e5c2b8072f4409c7c0004331d1db9652d5209c0Daniel Dunbar } 161395b851e55c328af4b69da7bfc1124bf258c0ffe5Chris Lattner 16148e5c2b8072f4409c7c0004331d1db9652d5209c0Daniel Dunbar QualType CFTy = getContext().getCFConstantStringType(); 16158e5c2b8072f4409c7c0004331d1db9652d5209c0Daniel Dunbar 16168e5c2b8072f4409c7c0004331d1db9652d5209c0Daniel Dunbar const llvm::StructType *STy = 16175fabf9dbee29464bcd06cd09f8e569d1b850f948Daniel Dunbar cast<llvm::StructType>(getTypes().ConvertType(CFTy)); 16181eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 16191eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump std::vector<llvm::Constant*> Fields(4); 162095b851e55c328af4b69da7bfc1124bf258c0ffe5Chris Lattner 162145e8cbdce25c2e16c7aac2036a591f6190097ae6Chris Lattner // Class pointer. 162245e8cbdce25c2e16c7aac2036a591f6190097ae6Chris Lattner Fields[0] = CFConstantStringClassRef; 1623eaf2bb89eb2aad3b80673de30febe52df43c10ecChris Lattner 162445e8cbdce25c2e16c7aac2036a591f6190097ae6Chris Lattner // Flags. 162545e8cbdce25c2e16c7aac2036a591f6190097ae6Chris Lattner const llvm::Type *Ty = getTypes().ConvertType(getContext().UnsignedIntTy); 16265fabf9dbee29464bcd06cd09f8e569d1b850f948Daniel Dunbar Fields[1] = isUTF16 ? llvm::ConstantInt::get(Ty, 0x07d0) : 162745e8cbdce25c2e16c7aac2036a591f6190097ae6Chris Lattner llvm::ConstantInt::get(Ty, 0x07C8); 162845e8cbdce25c2e16c7aac2036a591f6190097ae6Chris Lattner 162945e8cbdce25c2e16c7aac2036a591f6190097ae6Chris Lattner // String pointer. 16306143293fa4366ee95d7e47e61bd030a34bf68b55Daniel Dunbar llvm::Constant *C = llvm::ConstantArray::get(VMContext, Entry.getKey().str()); 16316143293fa4366ee95d7e47e61bd030a34bf68b55Daniel Dunbar 16326143293fa4366ee95d7e47e61bd030a34bf68b55Daniel Dunbar llvm::GlobalValue::LinkageTypes Linkage; 16336143293fa4366ee95d7e47e61bd030a34bf68b55Daniel Dunbar bool isConstant; 16345fabf9dbee29464bcd06cd09f8e569d1b850f948Daniel Dunbar if (isUTF16) { 16355fabf9dbee29464bcd06cd09f8e569d1b850f948Daniel Dunbar // FIXME: why do utf strings get "_" labels instead of "L" labels? 1636c9f29c61856ffb5f643cedbe87ac076f21a1381aChris Lattner Linkage = llvm::GlobalValue::InternalLinkage; 16376143293fa4366ee95d7e47e61bd030a34bf68b55Daniel Dunbar // Note: -fwritable-strings doesn't make unicode CFStrings writable, but 163841071debe9b8887449c3f2ee0dd7124ed47bdda8Daniel Dunbar // does make plain ascii ones writable. 1639af05bb9073319d8381b71c4325188853fd4b8ed6Daniel Dunbar isConstant = true; 1640af05bb9073319d8381b71c4325188853fd4b8ed6Daniel Dunbar } else { 16411eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump Linkage = llvm::GlobalValue::PrivateLinkage; 1642af05bb9073319d8381b71c4325188853fd4b8ed6Daniel Dunbar isConstant = !Features.WritableStrings; 16431eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump } 164417945a0f64fe03ff6ec0c2146005a87636e3ac12Argyrios Kyrtzidis 1645af05bb9073319d8381b71c4325188853fd4b8ed6Daniel Dunbar llvm::GlobalVariable *GV = 16461eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump new llvm::GlobalVariable(getModule(), C->getType(), isConstant, Linkage, C, 1647af05bb9073319d8381b71c4325188853fd4b8ed6Daniel Dunbar ".str"); 1648af05bb9073319d8381b71c4325188853fd4b8ed6Daniel Dunbar GV->setUnnamedAddr(true); 1649af05bb9073319d8381b71c4325188853fd4b8ed6Daniel Dunbar if (isUTF16) { 1650af05bb9073319d8381b71c4325188853fd4b8ed6Daniel Dunbar CharUnits Align = getContext().getTypeAlignInChars(getContext().ShortTy); 1651af05bb9073319d8381b71c4325188853fd4b8ed6Daniel Dunbar GV->setAlignment(Align.getQuantity()); 1652af05bb9073319d8381b71c4325188853fd4b8ed6Daniel Dunbar } 1653af05bb9073319d8381b71c4325188853fd4b8ed6Daniel Dunbar Fields[2] = llvm::ConstantExpr::getGetElementPtr(GV, Zeros, 2); 1654af05bb9073319d8381b71c4325188853fd4b8ed6Daniel Dunbar 1655af05bb9073319d8381b71c4325188853fd4b8ed6Daniel Dunbar // String length. 165617945a0f64fe03ff6ec0c2146005a87636e3ac12Argyrios Kyrtzidis Ty = getTypes().ConvertType(getContext().LongTy); 1657fef30b55230064d334a669a065a1c9acdb87cdfeFariborz Jahanian Fields[3] = llvm::ConstantInt::get(Ty, StringLength); 1658fef30b55230064d334a669a065a1c9acdb87cdfeFariborz Jahanian 1659af05bb9073319d8381b71c4325188853fd4b8ed6Daniel Dunbar // The struct. 166017945a0f64fe03ff6ec0c2146005a87636e3ac12Argyrios Kyrtzidis C = llvm::ConstantStruct::get(STy, Fields); 1661fef30b55230064d334a669a065a1c9acdb87cdfeFariborz Jahanian GV = new llvm::GlobalVariable(getModule(), C->getType(), true, 1662fef30b55230064d334a669a065a1c9acdb87cdfeFariborz Jahanian llvm::GlobalVariable::PrivateLinkage, C, 1663af05bb9073319d8381b71c4325188853fd4b8ed6Daniel Dunbar "_unnamed_cfstring_"); 1664af05bb9073319d8381b71c4325188853fd4b8ed6Daniel Dunbar if (const char *Sect = getContext().Target.getCFStringSection()) 1665af05bb9073319d8381b71c4325188853fd4b8ed6Daniel Dunbar GV->setSection(Sect); 1666af05bb9073319d8381b71c4325188853fd4b8ed6Daniel Dunbar Entry.setValue(GV); 166791e20dd8bf1bc8980ee93839383d2bd170bce050Anders Carlsson 1668984e06874685396ca2cb51f0008cfff7c9b3d9c6Anders Carlsson return GV; 166917945a0f64fe03ff6ec0c2146005a87636e3ac12Argyrios Kyrtzidis} 1670984e06874685396ca2cb51f0008cfff7c9b3d9c6Anders Carlsson 1671984e06874685396ca2cb51f0008cfff7c9b3d9c6Anders Carlssonllvm::Constant * 1672984e06874685396ca2cb51f0008cfff7c9b3d9c6Anders CarlssonCodeGenModule::GetAddrOfConstantString(const StringLiteral *Literal) { 1673984e06874685396ca2cb51f0008cfff7c9b3d9c6Anders Carlsson unsigned StringLength = 0; 167491e20dd8bf1bc8980ee93839383d2bd170bce050Anders Carlsson bool isUTF16 = false; 167591e20dd8bf1bc8980ee93839383d2bd170bce050Anders Carlsson llvm::StringMapEntry<llvm::Constant*> &Entry = 1676f976be8a63f9e0d3bd50e33dadef02c3c9921747Eli Friedman GetConstantCFStringEntry(CFConstantStringMap, Literal, 1677f976be8a63f9e0d3bd50e33dadef02c3c9921747Eli Friedman getTargetData().isLittleEndian(), 167891e20dd8bf1bc8980ee93839383d2bd170bce050Anders Carlsson isUTF16, StringLength); 167991e20dd8bf1bc8980ee93839383d2bd170bce050Anders Carlsson 168091e20dd8bf1bc8980ee93839383d2bd170bce050Anders Carlsson if (llvm::Constant *C = Entry.getValue()) 168191e20dd8bf1bc8980ee93839383d2bd170bce050Anders Carlsson return C; 168217945a0f64fe03ff6ec0c2146005a87636e3ac12Argyrios Kyrtzidis 168391e20dd8bf1bc8980ee93839383d2bd170bce050Anders Carlsson llvm::Constant *Zero = 168491e20dd8bf1bc8980ee93839383d2bd170bce050Anders Carlsson llvm::Constant::getNullValue(llvm::Type::getInt32Ty(VMContext)); 168591e20dd8bf1bc8980ee93839383d2bd170bce050Anders Carlsson llvm::Constant *Zeros[] = { Zero, Zero }; 168691e20dd8bf1bc8980ee93839383d2bd170bce050Anders Carlsson 168741071debe9b8887449c3f2ee0dd7124ed47bdda8Daniel Dunbar // If we don't already have it, get _NSConstantStringClassReference. 168841071debe9b8887449c3f2ee0dd7124ed47bdda8Daniel Dunbar if (!ConstantStringClassRef) { 168941071debe9b8887449c3f2ee0dd7124ed47bdda8Daniel Dunbar std::string StringClass(getLangOptions().ObjCConstantStringClass); 169041071debe9b8887449c3f2ee0dd7124ed47bdda8Daniel Dunbar const llvm::Type *Ty = getTypes().ConvertType(getContext().IntTy); 169141071debe9b8887449c3f2ee0dd7124ed47bdda8Daniel Dunbar Ty = llvm::ArrayType::get(Ty, 0); 169241071debe9b8887449c3f2ee0dd7124ed47bdda8Daniel Dunbar llvm::Constant *GV; 169341071debe9b8887449c3f2ee0dd7124ed47bdda8Daniel Dunbar if (StringClass.empty()) 169441071debe9b8887449c3f2ee0dd7124ed47bdda8Daniel Dunbar GV = CreateRuntimeVariable(Ty, 169516e8be2ac532358d4e413fdfa2643b1876edda78Douglas Gregor Features.ObjCNonFragileABI ? 169616e8be2ac532358d4e413fdfa2643b1876edda78Douglas Gregor "OBJC_CLASS_$_NSConstantString" : 169716e8be2ac532358d4e413fdfa2643b1876edda78Douglas Gregor "_NSConstantStringClassReference"); 16981eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump else { 169941071debe9b8887449c3f2ee0dd7124ed47bdda8Daniel Dunbar std::string str; 1700293361afd4199c92aabff9267fddea890943c586Anders Carlsson if (Features.ObjCNonFragileABI) 17012b77ba8bc7a842829ad9193816dc1d7d5e9c5be6Anders Carlsson str = "OBJC_CLASS_$_" + StringClass; 170241071debe9b8887449c3f2ee0dd7124ed47bdda8Daniel Dunbar else 170316e8be2ac532358d4e413fdfa2643b1876edda78Douglas Gregor str = "_" + StringClass + "ClassReference"; 170416e8be2ac532358d4e413fdfa2643b1876edda78Douglas Gregor GV = CreateRuntimeVariable(Ty, str); 170516e8be2ac532358d4e413fdfa2643b1876edda78Douglas Gregor } 17061eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // Decay array -> ptr 1707555b4bb2749aea2ec8e2adc351a71ec1cb9bdc33Anders Carlsson ConstantStringClassRef = 1708555b4bb2749aea2ec8e2adc351a71ec1cb9bdc33Anders Carlsson llvm::ConstantExpr::getGetElementPtr(GV, Zeros, 2); 1709555b4bb2749aea2ec8e2adc351a71ec1cb9bdc33Anders Carlsson } 171041071debe9b8887449c3f2ee0dd7124ed47bdda8Daniel Dunbar 1711555b4bb2749aea2ec8e2adc351a71ec1cb9bdc33Anders Carlsson QualType NSTy = getContext().getNSConstantStringType(); 171241071debe9b8887449c3f2ee0dd7124ed47bdda8Daniel Dunbar 171341071debe9b8887449c3f2ee0dd7124ed47bdda8Daniel Dunbar const llvm::StructType *STy = 171495d4e5d2f87a0f07fb143ccb824dfc4c5c595c78Anders Carlsson cast<llvm::StructType>(getTypes().ConvertType(NSTy)); 171541071debe9b8887449c3f2ee0dd7124ed47bdda8Daniel Dunbar 1716984e06874685396ca2cb51f0008cfff7c9b3d9c6Anders Carlsson std::vector<llvm::Constant*> Fields(3); 171741071debe9b8887449c3f2ee0dd7124ed47bdda8Daniel Dunbar 17189cfbe48a7a20a217fdb2920b29b67ae7941cb116Douglas Gregor // Class pointer. 17199d0c6613ec040ad8d952556be909232a7f25dedeJohn McCall Fields[0] = ConstantStringClassRef; 17209cfbe48a7a20a217fdb2920b29b67ae7941cb116Douglas Gregor 1721dd9967a6374c9a44be4af02aaeee340ffb82848fDouglas Gregor // String pointer. 1722127102b5196ffe04bdb70fd553fe62c265ab10a9Douglas Gregor llvm::Constant *C = llvm::ConstantArray::get(VMContext, Entry.getKey().str()); 1723127102b5196ffe04bdb70fd553fe62c265ab10a9Douglas Gregor 1724018837b081bd1a725bae1c020eb1649975b04d67Anders Carlsson llvm::GlobalValue::LinkageTypes Linkage; 17259cfbe48a7a20a217fdb2920b29b67ae7941cb116Douglas Gregor bool isConstant; 172695d4e5d2f87a0f07fb143ccb824dfc4c5c595c78Anders Carlsson if (isUTF16) { 172795d4e5d2f87a0f07fb143ccb824dfc4c5c595c78Anders Carlsson // FIXME: why do utf strings get "_" labels instead of "L" labels? 172895d4e5d2f87a0f07fb143ccb824dfc4c5c595c78Anders Carlsson Linkage = llvm::GlobalValue::InternalLinkage; 172927ae53665f8b00fe4ba21da0fa79a4ce6e0b6cd5Anders Carlsson // Note: -fwritable-strings doesn't make unicode NSStrings writable, but 173027ae53665f8b00fe4ba21da0fa79a4ce6e0b6cd5Anders Carlsson // does make plain ascii ones writable. 173127ae53665f8b00fe4ba21da0fa79a4ce6e0b6cd5Anders Carlsson isConstant = true; 173236674d2978eb53962218ac67bb4d352cc287ea05Anders Carlsson } else { 173336674d2978eb53962218ac67bb4d352cc287ea05Anders Carlsson Linkage = llvm::GlobalValue::PrivateLinkage; 173436674d2978eb53962218ac67bb4d352cc287ea05Anders Carlsson isConstant = !Features.WritableStrings; 173536674d2978eb53962218ac67bb4d352cc287ea05Anders Carlsson } 173636674d2978eb53962218ac67bb4d352cc287ea05Anders Carlsson 173795d4e5d2f87a0f07fb143ccb824dfc4c5c595c78Anders Carlsson llvm::GlobalVariable *GV = 17381eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump new llvm::GlobalVariable(getModule(), C->getType(), isConstant, Linkage, C, 173938e24c782c17b6058bf61d635747bbde19fb1bc7Fariborz Jahanian ".str"); 174041071debe9b8887449c3f2ee0dd7124ed47bdda8Daniel Dunbar GV->setUnnamedAddr(true); 174141071debe9b8887449c3f2ee0dd7124ed47bdda8Daniel Dunbar if (isUTF16) { 1742b31cb7f1752ea011fd06ac9574ce24667d11cbdbFariborz Jahanian CharUnits Align = getContext().getTypeAlignInChars(getContext().ShortTy); 1743b31cb7f1752ea011fd06ac9574ce24667d11cbdbFariborz Jahanian GV->setAlignment(Align.getQuantity()); 174441071debe9b8887449c3f2ee0dd7124ed47bdda8Daniel Dunbar } 1745285d0dba947b7c9960eaa88e8c4fced0398d4319Chris Lattner Fields[1] = llvm::ConstantExpr::getGetElementPtr(GV, Zeros, 2); 174641071debe9b8887449c3f2ee0dd7124ed47bdda8Daniel Dunbar 1747b31cb7f1752ea011fd06ac9574ce24667d11cbdbFariborz Jahanian // String length. 174841071debe9b8887449c3f2ee0dd7124ed47bdda8Daniel Dunbar const llvm::Type *Ty = getTypes().ConvertType(getContext().UnsignedIntTy); 174941071debe9b8887449c3f2ee0dd7124ed47bdda8Daniel Dunbar Fields[2] = llvm::ConstantInt::get(Ty, StringLength); 175041071debe9b8887449c3f2ee0dd7124ed47bdda8Daniel Dunbar 1751af05bb9073319d8381b71c4325188853fd4b8ed6Daniel Dunbar // The struct. 1752af05bb9073319d8381b71c4325188853fd4b8ed6Daniel Dunbar C = llvm::ConstantStruct::get(STy, Fields); 175341071debe9b8887449c3f2ee0dd7124ed47bdda8Daniel Dunbar GV = new llvm::GlobalVariable(getModule(), C->getType(), true, 175441071debe9b8887449c3f2ee0dd7124ed47bdda8Daniel Dunbar llvm::GlobalVariable::PrivateLinkage, C, 175541071debe9b8887449c3f2ee0dd7124ed47bdda8Daniel Dunbar "_unnamed_nsstring_"); 1756af05bb9073319d8381b71c4325188853fd4b8ed6Daniel Dunbar // FIXME. Fix section. 1757af05bb9073319d8381b71c4325188853fd4b8ed6Daniel Dunbar if (const char *Sect = 1758af05bb9073319d8381b71c4325188853fd4b8ed6Daniel Dunbar Features.ObjCNonFragileABI 1759af05bb9073319d8381b71c4325188853fd4b8ed6Daniel Dunbar ? getContext().Target.getNSStringNonFragileABISection() 176041071debe9b8887449c3f2ee0dd7124ed47bdda8Daniel Dunbar : getContext().Target.getNSStringSection()) 17611eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump GV->setSection(Sect); 176241071debe9b8887449c3f2ee0dd7124ed47bdda8Daniel Dunbar Entry.setValue(GV); 176341071debe9b8887449c3f2ee0dd7124ed47bdda8Daniel Dunbar 176441071debe9b8887449c3f2ee0dd7124ed47bdda8Daniel Dunbar return GV; 17656fb0aee4f9dc261bbec72e1283ad8dc0557a6d96Argyrios Kyrtzidis} 176641071debe9b8887449c3f2ee0dd7124ed47bdda8Daniel Dunbar 176741071debe9b8887449c3f2ee0dd7124ed47bdda8Daniel Dunbar/// GetStringForStringLiteral - Return the appropriate bytes for a 176841071debe9b8887449c3f2ee0dd7124ed47bdda8Daniel Dunbar/// string literal, properly padded to match the literal type. 17691eb4433ac451dc16f4133a88af2d002ac26c58efMike Stumpstd::string CodeGenModule::GetStringForStringLiteral(const StringLiteral *E) { 1770305c658ebce84bb9833fc0e7675554656453b8e8Fariborz Jahanian const ASTContext &Context = getContext(); 177141071debe9b8887449c3f2ee0dd7124ed47bdda8Daniel Dunbar const ConstantArrayType *CAT = 177241071debe9b8887449c3f2ee0dd7124ed47bdda8Daniel Dunbar Context.getAsConstantArrayType(E->getType()); 177391e20dd8bf1bc8980ee93839383d2bd170bce050Anders Carlsson assert(CAT && "String isn't pointer or array!"); 177491e20dd8bf1bc8980ee93839383d2bd170bce050Anders Carlsson 177541071debe9b8887449c3f2ee0dd7124ed47bdda8Daniel Dunbar // Resize the string to the right size. 177641071debe9b8887449c3f2ee0dd7124ed47bdda8Daniel Dunbar uint64_t RealLen = CAT->getSize().getZExtValue(); 177741071debe9b8887449c3f2ee0dd7124ed47bdda8Daniel Dunbar 177841071debe9b8887449c3f2ee0dd7124ed47bdda8Daniel Dunbar if (E->isWide()) 177941071debe9b8887449c3f2ee0dd7124ed47bdda8Daniel Dunbar RealLen *= Context.Target.getWCharWidth() / Context.getCharWidth(); 178041071debe9b8887449c3f2ee0dd7124ed47bdda8Daniel Dunbar 17811eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump std::string Str = E->getString().str(); 178241071debe9b8887449c3f2ee0dd7124ed47bdda8Daniel Dunbar Str.resize(RealLen, '\0'); 178341071debe9b8887449c3f2ee0dd7124ed47bdda8Daniel Dunbar 178441071debe9b8887449c3f2ee0dd7124ed47bdda8Daniel Dunbar return Str; 178541071debe9b8887449c3f2ee0dd7124ed47bdda8Daniel Dunbar} 178641071debe9b8887449c3f2ee0dd7124ed47bdda8Daniel Dunbar 178741071debe9b8887449c3f2ee0dd7124ed47bdda8Daniel Dunbar/// GetAddrOfConstantStringFromLiteral - Return a pointer to a 178841071debe9b8887449c3f2ee0dd7124ed47bdda8Daniel Dunbar/// constant array for the given string literal. 17891eb4433ac451dc16f4133a88af2d002ac26c58efMike Stumpllvm::Constant * 17901eb4433ac451dc16f4133a88af2d002ac26c58efMike StumpCodeGenModule::GetAddrOfConstantStringFromLiteral(const StringLiteral *S) { 1791f5408fe484495ee4efbdd709c8a2c2fdbbbdb328Mike Stump // FIXME: This can be more efficient. 1792f5408fe484495ee4efbdd709c8a2c2fdbbbdb328Mike Stump // FIXME: We shouldn't need to bitcast the constant in the wide string case. 1793f5408fe484495ee4efbdd709c8a2c2fdbbbdb328Mike Stump llvm::Constant *C = GetAddrOfConstantString(GetStringForStringLiteral(S)); 179441071debe9b8887449c3f2ee0dd7124ed47bdda8Daniel Dunbar if (S->isWide()) { 179541071debe9b8887449c3f2ee0dd7124ed47bdda8Daniel Dunbar llvm::Type *DestTy = 179641071debe9b8887449c3f2ee0dd7124ed47bdda8Daniel Dunbar llvm::PointerType::getUnqual(getTypes().ConvertType(S->getType())); 1797 C = llvm::ConstantExpr::getBitCast(C, DestTy); 1798 } 1799 return C; 1800} 1801 1802/// GetAddrOfConstantStringFromObjCEncode - Return a pointer to a constant 1803/// array for the given ObjCEncodeExpr node. 1804llvm::Constant * 1805CodeGenModule::GetAddrOfConstantStringFromObjCEncode(const ObjCEncodeExpr *E) { 1806 std::string Str; 1807 getContext().getObjCEncodingForType(E->getEncodedType(), Str); 1808 1809 return GetAddrOfConstantCString(Str); 1810} 1811 1812 1813/// GenerateWritableString -- Creates storage for a string literal. 1814static llvm::Constant *GenerateStringLiteral(const std::string &str, 1815 bool constant, 1816 CodeGenModule &CGM, 1817 const char *GlobalName) { 1818 // Create Constant for this string literal. Don't add a '\0'. 1819 llvm::Constant *C = 1820 llvm::ConstantArray::get(CGM.getLLVMContext(), str, false); 1821 1822 // Create a global variable for this string 1823 llvm::GlobalVariable *GV = 1824 new llvm::GlobalVariable(CGM.getModule(), C->getType(), constant, 1825 llvm::GlobalValue::PrivateLinkage, 1826 C, GlobalName); 1827 GV->setUnnamedAddr(true); 1828 return GV; 1829} 1830 1831/// GetAddrOfConstantString - Returns a pointer to a character array 1832/// containing the literal. This contents are exactly that of the 1833/// given string, i.e. it will not be null terminated automatically; 1834/// see GetAddrOfConstantCString. Note that whether the result is 1835/// actually a pointer to an LLVM constant depends on 1836/// Feature.WriteableStrings. 1837/// 1838/// The result has pointer to array type. 1839llvm::Constant *CodeGenModule::GetAddrOfConstantString(const std::string &str, 1840 const char *GlobalName) { 1841 bool IsConstant = !Features.WritableStrings; 1842 1843 // Get the default prefix if a name wasn't specified. 1844 if (!GlobalName) 1845 GlobalName = ".str"; 1846 1847 // Don't share any string literals if strings aren't constant. 1848 if (!IsConstant) 1849 return GenerateStringLiteral(str, false, *this, GlobalName); 1850 1851 llvm::StringMapEntry<llvm::Constant *> &Entry = 1852 ConstantStringMap.GetOrCreateValue(&str[0], &str[str.length()]); 1853 1854 if (Entry.getValue()) 1855 return Entry.getValue(); 1856 1857 // Create a global variable for this. 1858 llvm::Constant *C = GenerateStringLiteral(str, true, *this, GlobalName); 1859 Entry.setValue(C); 1860 return C; 1861} 1862 1863/// GetAddrOfConstantCString - Returns a pointer to a character 1864/// array containing the literal and a terminating '\-' 1865/// character. The result has pointer to array type. 1866llvm::Constant *CodeGenModule::GetAddrOfConstantCString(const std::string &str, 1867 const char *GlobalName){ 1868 return GetAddrOfConstantString(str + '\0', GlobalName); 1869} 1870 1871/// EmitObjCPropertyImplementations - Emit information for synthesized 1872/// properties for an implementation. 1873void CodeGenModule::EmitObjCPropertyImplementations(const 1874 ObjCImplementationDecl *D) { 1875 for (ObjCImplementationDecl::propimpl_iterator 1876 i = D->propimpl_begin(), e = D->propimpl_end(); i != e; ++i) { 1877 ObjCPropertyImplDecl *PID = *i; 1878 1879 // Dynamic is just for type-checking. 1880 if (PID->getPropertyImplementation() == ObjCPropertyImplDecl::Synthesize) { 1881 ObjCPropertyDecl *PD = PID->getPropertyDecl(); 1882 1883 // Determine which methods need to be implemented, some may have 1884 // been overridden. Note that ::isSynthesized is not the method 1885 // we want, that just indicates if the decl came from a 1886 // property. What we want to know is if the method is defined in 1887 // this implementation. 1888 if (!D->getInstanceMethod(PD->getGetterName())) 1889 CodeGenFunction(*this).GenerateObjCGetter( 1890 const_cast<ObjCImplementationDecl *>(D), PID); 1891 if (!PD->isReadOnly() && 1892 !D->getInstanceMethod(PD->getSetterName())) 1893 CodeGenFunction(*this).GenerateObjCSetter( 1894 const_cast<ObjCImplementationDecl *>(D), PID); 1895 } 1896 } 1897} 1898 1899/// EmitObjCIvarInitializations - Emit information for ivar initialization 1900/// for an implementation. 1901void CodeGenModule::EmitObjCIvarInitializations(ObjCImplementationDecl *D) { 1902 if (!Features.NeXTRuntime || D->getNumIvarInitializers() == 0) 1903 return; 1904 DeclContext* DC = const_cast<DeclContext*>(dyn_cast<DeclContext>(D)); 1905 assert(DC && "EmitObjCIvarInitializations - null DeclContext"); 1906 IdentifierInfo *II = &getContext().Idents.get(".cxx_destruct"); 1907 Selector cxxSelector = getContext().Selectors.getSelector(0, &II); 1908 ObjCMethodDecl *DTORMethod = ObjCMethodDecl::Create(getContext(), 1909 D->getLocation(), 1910 D->getLocation(), cxxSelector, 1911 getContext().VoidTy, 0, 1912 DC, true, false, true, false, 1913 ObjCMethodDecl::Required); 1914 D->addInstanceMethod(DTORMethod); 1915 CodeGenFunction(*this).GenerateObjCCtorDtorMethod(D, DTORMethod, false); 1916 1917 II = &getContext().Idents.get(".cxx_construct"); 1918 cxxSelector = getContext().Selectors.getSelector(0, &II); 1919 // The constructor returns 'self'. 1920 ObjCMethodDecl *CTORMethod = ObjCMethodDecl::Create(getContext(), 1921 D->getLocation(), 1922 D->getLocation(), cxxSelector, 1923 getContext().getObjCIdType(), 0, 1924 DC, true, false, true, false, 1925 ObjCMethodDecl::Required); 1926 D->addInstanceMethod(CTORMethod); 1927 CodeGenFunction(*this).GenerateObjCCtorDtorMethod(D, CTORMethod, true); 1928 1929 1930} 1931 1932/// EmitNamespace - Emit all declarations in a namespace. 1933void CodeGenModule::EmitNamespace(const NamespaceDecl *ND) { 1934 for (RecordDecl::decl_iterator I = ND->decls_begin(), E = ND->decls_end(); 1935 I != E; ++I) 1936 EmitTopLevelDecl(*I); 1937} 1938 1939// EmitLinkageSpec - Emit all declarations in a linkage spec. 1940void CodeGenModule::EmitLinkageSpec(const LinkageSpecDecl *LSD) { 1941 if (LSD->getLanguage() != LinkageSpecDecl::lang_c && 1942 LSD->getLanguage() != LinkageSpecDecl::lang_cxx) { 1943 ErrorUnsupported(LSD, "linkage spec"); 1944 return; 1945 } 1946 1947 for (RecordDecl::decl_iterator I = LSD->decls_begin(), E = LSD->decls_end(); 1948 I != E; ++I) 1949 EmitTopLevelDecl(*I); 1950} 1951 1952/// EmitTopLevelDecl - Emit code for a single top level declaration. 1953void CodeGenModule::EmitTopLevelDecl(Decl *D) { 1954 // If an error has occurred, stop code generation, but continue 1955 // parsing and semantic analysis (to ensure all warnings and errors 1956 // are emitted). 1957 if (Diags.hasErrorOccurred()) 1958 return; 1959 1960 // Ignore dependent declarations. 1961 if (D->getDeclContext() && D->getDeclContext()->isDependentContext()) 1962 return; 1963 1964 switch (D->getKind()) { 1965 case Decl::CXXConversion: 1966 case Decl::CXXMethod: 1967 case Decl::Function: 1968 // Skip function templates 1969 if (cast<FunctionDecl>(D)->getDescribedFunctionTemplate()) 1970 return; 1971 1972 EmitGlobal(cast<FunctionDecl>(D)); 1973 break; 1974 1975 case Decl::Var: 1976 EmitGlobal(cast<VarDecl>(D)); 1977 break; 1978 1979 // C++ Decls 1980 case Decl::Namespace: 1981 EmitNamespace(cast<NamespaceDecl>(D)); 1982 break; 1983 // No code generation needed. 1984 case Decl::UsingShadow: 1985 case Decl::Using: 1986 case Decl::UsingDirective: 1987 case Decl::ClassTemplate: 1988 case Decl::FunctionTemplate: 1989 case Decl::NamespaceAlias: 1990 break; 1991 case Decl::CXXConstructor: 1992 // Skip function templates 1993 if (cast<FunctionDecl>(D)->getDescribedFunctionTemplate()) 1994 return; 1995 1996 EmitCXXConstructors(cast<CXXConstructorDecl>(D)); 1997 break; 1998 case Decl::CXXDestructor: 1999 EmitCXXDestructors(cast<CXXDestructorDecl>(D)); 2000 break; 2001 2002 case Decl::StaticAssert: 2003 // Nothing to do. 2004 break; 2005 2006 // Objective-C Decls 2007 2008 // Forward declarations, no (immediate) code generation. 2009 case Decl::ObjCClass: 2010 case Decl::ObjCForwardProtocol: 2011 case Decl::ObjCInterface: 2012 break; 2013 2014 case Decl::ObjCCategory: { 2015 ObjCCategoryDecl *CD = cast<ObjCCategoryDecl>(D); 2016 if (CD->IsClassExtension() && CD->hasSynthBitfield()) 2017 Context.ResetObjCLayout(CD->getClassInterface()); 2018 break; 2019 } 2020 2021 2022 case Decl::ObjCProtocol: 2023 Runtime->GenerateProtocol(cast<ObjCProtocolDecl>(D)); 2024 break; 2025 2026 case Decl::ObjCCategoryImpl: 2027 // Categories have properties but don't support synthesize so we 2028 // can ignore them here. 2029 Runtime->GenerateCategory(cast<ObjCCategoryImplDecl>(D)); 2030 break; 2031 2032 case Decl::ObjCImplementation: { 2033 ObjCImplementationDecl *OMD = cast<ObjCImplementationDecl>(D); 2034 if (Features.ObjCNonFragileABI2 && OMD->hasSynthBitfield()) 2035 Context.ResetObjCLayout(OMD->getClassInterface()); 2036 EmitObjCPropertyImplementations(OMD); 2037 EmitObjCIvarInitializations(OMD); 2038 Runtime->GenerateClass(OMD); 2039 break; 2040 } 2041 case Decl::ObjCMethod: { 2042 ObjCMethodDecl *OMD = cast<ObjCMethodDecl>(D); 2043 // If this is not a prototype, emit the body. 2044 if (OMD->getBody()) 2045 CodeGenFunction(*this).GenerateObjCMethod(OMD); 2046 break; 2047 } 2048 case Decl::ObjCCompatibleAlias: 2049 // compatibility-alias is a directive and has no code gen. 2050 break; 2051 2052 case Decl::LinkageSpec: 2053 EmitLinkageSpec(cast<LinkageSpecDecl>(D)); 2054 break; 2055 2056 case Decl::FileScopeAsm: { 2057 FileScopeAsmDecl *AD = cast<FileScopeAsmDecl>(D); 2058 llvm::StringRef AsmString = AD->getAsmString()->getString(); 2059 2060 const std::string &S = getModule().getModuleInlineAsm(); 2061 if (S.empty()) 2062 getModule().setModuleInlineAsm(AsmString); 2063 else 2064 getModule().setModuleInlineAsm(S + '\n' + AsmString.str()); 2065 break; 2066 } 2067 2068 default: 2069 // Make sure we handled everything we should, every other kind is a 2070 // non-top-level decl. FIXME: Would be nice to have an isTopLevelDeclKind 2071 // function. Need to recode Decl::Kind to do that easily. 2072 assert(isa<TypeDecl>(D) && "Unsupported decl kind"); 2073 } 2074} 2075 2076/// Turns the given pointer into a constant. 2077static llvm::Constant *GetPointerConstant(llvm::LLVMContext &Context, 2078 const void *Ptr) { 2079 uintptr_t PtrInt = reinterpret_cast<uintptr_t>(Ptr); 2080 const llvm::Type *i64 = llvm::Type::getInt64Ty(Context); 2081 return llvm::ConstantInt::get(i64, PtrInt); 2082} 2083 2084static void EmitGlobalDeclMetadata(CodeGenModule &CGM, 2085 llvm::NamedMDNode *&GlobalMetadata, 2086 GlobalDecl D, 2087 llvm::GlobalValue *Addr) { 2088 if (!GlobalMetadata) 2089 GlobalMetadata = 2090 CGM.getModule().getOrInsertNamedMetadata("clang.global.decl.ptrs"); 2091 2092 // TODO: should we report variant information for ctors/dtors? 2093 llvm::Value *Ops[] = { 2094 Addr, 2095 GetPointerConstant(CGM.getLLVMContext(), D.getDecl()) 2096 }; 2097 GlobalMetadata->addOperand(llvm::MDNode::get(CGM.getLLVMContext(), Ops, 2)); 2098} 2099 2100/// Emits metadata nodes associating all the global values in the 2101/// current module with the Decls they came from. This is useful for 2102/// projects using IR gen as a subroutine. 2103/// 2104/// Since there's currently no way to associate an MDNode directly 2105/// with an llvm::GlobalValue, we create a global named metadata 2106/// with the name 'clang.global.decl.ptrs'. 2107void CodeGenModule::EmitDeclMetadata() { 2108 llvm::NamedMDNode *GlobalMetadata = 0; 2109 2110 // StaticLocalDeclMap 2111 for (llvm::DenseMap<GlobalDecl,llvm::StringRef>::iterator 2112 I = MangledDeclNames.begin(), E = MangledDeclNames.end(); 2113 I != E; ++I) { 2114 llvm::GlobalValue *Addr = getModule().getNamedValue(I->second); 2115 EmitGlobalDeclMetadata(*this, GlobalMetadata, I->first, Addr); 2116 } 2117} 2118 2119/// Emits metadata nodes for all the local variables in the current 2120/// function. 2121void CodeGenFunction::EmitDeclMetadata() { 2122 if (LocalDeclMap.empty()) return; 2123 2124 llvm::LLVMContext &Context = getLLVMContext(); 2125 2126 // Find the unique metadata ID for this name. 2127 unsigned DeclPtrKind = Context.getMDKindID("clang.decl.ptr"); 2128 2129 llvm::NamedMDNode *GlobalMetadata = 0; 2130 2131 for (llvm::DenseMap<const Decl*, llvm::Value*>::iterator 2132 I = LocalDeclMap.begin(), E = LocalDeclMap.end(); I != E; ++I) { 2133 const Decl *D = I->first; 2134 llvm::Value *Addr = I->second; 2135 2136 if (llvm::AllocaInst *Alloca = dyn_cast<llvm::AllocaInst>(Addr)) { 2137 llvm::Value *DAddr = GetPointerConstant(getLLVMContext(), D); 2138 Alloca->setMetadata(DeclPtrKind, llvm::MDNode::get(Context, &DAddr, 1)); 2139 } else if (llvm::GlobalValue *GV = dyn_cast<llvm::GlobalValue>(Addr)) { 2140 GlobalDecl GD = GlobalDecl(cast<VarDecl>(D)); 2141 EmitGlobalDeclMetadata(CGM, GlobalMetadata, GD, GV); 2142 } 2143 } 2144} 2145 2146///@name Custom Runtime Function Interfaces 2147///@{ 2148// 2149// FIXME: These can be eliminated once we can have clients just get the required 2150// AST nodes from the builtin tables. 2151 2152llvm::Constant *CodeGenModule::getBlockObjectDispose() { 2153 if (BlockObjectDispose) 2154 return BlockObjectDispose; 2155 2156 // If we saw an explicit decl, use that. 2157 if (BlockObjectDisposeDecl) { 2158 return BlockObjectDispose = GetAddrOfFunction( 2159 BlockObjectDisposeDecl, 2160 getTypes().GetFunctionType(BlockObjectDisposeDecl)); 2161 } 2162 2163 // Otherwise construct the function by hand. 2164 const llvm::FunctionType *FTy; 2165 std::vector<const llvm::Type*> ArgTys; 2166 const llvm::Type *ResultType = llvm::Type::getVoidTy(VMContext); 2167 ArgTys.push_back(PtrToInt8Ty); 2168 ArgTys.push_back(llvm::Type::getInt32Ty(VMContext)); 2169 FTy = llvm::FunctionType::get(ResultType, ArgTys, false); 2170 return BlockObjectDispose = 2171 CreateRuntimeFunction(FTy, "_Block_object_dispose"); 2172} 2173 2174llvm::Constant *CodeGenModule::getBlockObjectAssign() { 2175 if (BlockObjectAssign) 2176 return BlockObjectAssign; 2177 2178 // If we saw an explicit decl, use that. 2179 if (BlockObjectAssignDecl) { 2180 return BlockObjectAssign = GetAddrOfFunction( 2181 BlockObjectAssignDecl, 2182 getTypes().GetFunctionType(BlockObjectAssignDecl)); 2183 } 2184 2185 // Otherwise construct the function by hand. 2186 const llvm::FunctionType *FTy; 2187 std::vector<const llvm::Type*> ArgTys; 2188 const llvm::Type *ResultType = llvm::Type::getVoidTy(VMContext); 2189 ArgTys.push_back(PtrToInt8Ty); 2190 ArgTys.push_back(PtrToInt8Ty); 2191 ArgTys.push_back(llvm::Type::getInt32Ty(VMContext)); 2192 FTy = llvm::FunctionType::get(ResultType, ArgTys, false); 2193 return BlockObjectAssign = 2194 CreateRuntimeFunction(FTy, "_Block_object_assign"); 2195} 2196 2197llvm::Constant *CodeGenModule::getNSConcreteGlobalBlock() { 2198 if (NSConcreteGlobalBlock) 2199 return NSConcreteGlobalBlock; 2200 2201 // If we saw an explicit decl, use that. 2202 if (NSConcreteGlobalBlockDecl) { 2203 return NSConcreteGlobalBlock = GetAddrOfGlobalVar( 2204 NSConcreteGlobalBlockDecl, 2205 getTypes().ConvertType(NSConcreteGlobalBlockDecl->getType())); 2206 } 2207 2208 // Otherwise construct the variable by hand. 2209 return NSConcreteGlobalBlock = CreateRuntimeVariable( 2210 PtrToInt8Ty, "_NSConcreteGlobalBlock"); 2211} 2212 2213llvm::Constant *CodeGenModule::getNSConcreteStackBlock() { 2214 if (NSConcreteStackBlock) 2215 return NSConcreteStackBlock; 2216 2217 // If we saw an explicit decl, use that. 2218 if (NSConcreteStackBlockDecl) { 2219 return NSConcreteStackBlock = GetAddrOfGlobalVar( 2220 NSConcreteStackBlockDecl, 2221 getTypes().ConvertType(NSConcreteStackBlockDecl->getType())); 2222 } 2223 2224 // Otherwise construct the variable by hand. 2225 return NSConcreteStackBlock = CreateRuntimeVariable( 2226 PtrToInt8Ty, "_NSConcreteStackBlock"); 2227} 2228 2229///@} 2230