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Reid Spencer5f016e22007-07-11 17:01:13 +00001//===--- CodeGenModule.cpp - Emit LLVM Code from ASTs for a Module --------===//
2//
3// The LLVM Compiler Infrastructure
4//
Chris Lattner0bc735f2007-12-29 19:59:25 +00005// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
Reid Spencer5f016e22007-07-11 17:01:13 +00007//
8//===----------------------------------------------------------------------===//
9//
10// This coordinates the per-module state used while generating code.
11//
12//===----------------------------------------------------------------------===//
13
14#include "CodeGenModule.h"
Peter Collingbourne6c0aa5f2011-10-06 18:29:37 +000015#include "CGCUDARuntime.h"
John McCall4c40d982010-08-31 07:33:07 +000016#include "CGCXXABI.h"
Chandler Carruth55fc8732012-12-04 09:13:33 +000017#include "CGCall.h"
18#include "CGDebugInfo.h"
Daniel Dunbaraf2f62c2008-08-13 00:59:25 +000019#include "CGObjCRuntime.h"
Peter Collingbourne8c25fc52011-09-19 21:14:35 +000020#include "CGOpenCLRuntime.h"
Chandler Carruth55fc8732012-12-04 09:13:33 +000021#include "CodeGenFunction.h"
22#include "CodeGenTBAA.h"
Anton Korobeynikov82d0a412010-01-10 12:58:08 +000023#include "TargetInfo.h"
Reid Spencer5f016e22007-07-11 17:01:13 +000024#include "clang/AST/ASTContext.h"
Ken Dyck687cc4a2010-01-26 13:48:07 +000025#include "clang/AST/CharUnits.h"
Chris Lattner21ef7ae2008-11-04 16:51:42 +000026#include "clang/AST/DeclCXX.h"
Chandler Carruth55fc8732012-12-04 09:13:33 +000027#include "clang/AST/DeclObjC.h"
Douglas Gregoraf896892010-06-21 18:41:26 +000028#include "clang/AST/DeclTemplate.h"
Peter Collingbourne14110472011-01-13 18:57:25 +000029#include "clang/AST/Mangle.h"
Anders Carlsson1a5e0d72009-11-30 23:41:22 +000030#include "clang/AST/RecordLayout.h"
Rafael Espindolaa411d2f2011-10-26 20:41:06 +000031#include "clang/AST/RecursiveASTVisitor.h"
Rafael Espindolabcf6b982011-12-19 14:41:01 +000032#include "clang/Basic/Builtins.h"
Jordan Rose3f6f51e2013-02-08 22:30:41 +000033#include "clang/Basic/CharInfo.h"
Chris Lattner2c8569d2007-12-02 07:19:18 +000034#include "clang/Basic/Diagnostic.h"
Douglas Gregorb6cbe512013-01-14 17:21:00 +000035#include "clang/Basic/Module.h"
Nate Begeman8bd4afe2008-04-19 04:17:09 +000036#include "clang/Basic/SourceManager.h"
Reid Spencer5f016e22007-07-11 17:01:13 +000037#include "clang/Basic/TargetInfo.h"
Bill Wendlinge1092df2013-02-14 08:09:20 +000038#include "clang/Basic/TargetOptions.h"
Chandler Carruth55fc8732012-12-04 09:13:33 +000039#include "clang/Frontend/CodeGenOptions.h"
Sebastian Redl19b1a6e2012-02-25 20:51:20 +000040#include "llvm/ADT/APSInt.h"
John McCall6374c332010-03-06 00:35:14 +000041#include "llvm/ADT/Triple.h"
Chandler Carruth3b844ba2013-01-02 11:45:17 +000042#include "llvm/IR/CallingConv.h"
43#include "llvm/IR/DataLayout.h"
44#include "llvm/IR/Intrinsics.h"
45#include "llvm/IR/LLVMContext.h"
46#include "llvm/IR/Module.h"
Gabor Greif6ba728d2010-04-10 02:56:12 +000047#include "llvm/Support/CallSite.h"
Dmitri Gribenkocb5620c2013-01-30 12:06:08 +000048#include "llvm/Support/ConvertUTF.h"
Chris Lattner78f7ece2009-11-07 09:22:46 +000049#include "llvm/Support/ErrorHandling.h"
Chandler Carruth55fc8732012-12-04 09:13:33 +000050#include "llvm/Target/Mangler.h"
Dmitri Gribenkocb5620c2013-01-30 12:06:08 +000051
Reid Spencer5f016e22007-07-11 17:01:13 +000052using namespace clang;
53using namespace CodeGen;
54
Julien Lerouge77f68bb2011-09-09 22:41:49 +000055static const char AnnotationSection[] = "llvm.metadata";
56
John McCallf16aa102010-08-22 21:01:12 +000057static CGCXXABI &createCXXABI(CodeGenModule &CGM) {
John McCallb8b2c9d2013-01-25 22:30:49 +000058 switch (CGM.getContext().getTargetInfo().getCXXABI().getKind()) {
Tim Northoverc264e162013-01-31 12:13:10 +000059 case TargetCXXABI::GenericAArch64:
John McCall96fcde02013-01-25 23:36:14 +000060 case TargetCXXABI::GenericARM:
61 case TargetCXXABI::iOS:
62 case TargetCXXABI::GenericItanium:
63 return *CreateItaniumCXXABI(CGM);
64 case TargetCXXABI::Microsoft:
65 return *CreateMicrosoftCXXABI(CGM);
John McCallf16aa102010-08-22 21:01:12 +000066 }
67
68 llvm_unreachable("invalid C++ ABI kind");
John McCallf16aa102010-08-22 21:01:12 +000069}
70
Reid Spencer5f016e22007-07-11 17:01:13 +000071
Chandler Carruth2811ccf2009-11-12 17:24:48 +000072CodeGenModule::CodeGenModule(ASTContext &C, const CodeGenOptions &CGO,
Bill Wendlinge1092df2013-02-14 08:09:20 +000073 const TargetOptions &TO, llvm::Module &M,
74 const llvm::DataLayout &TD,
David Blaikied6471f72011-09-25 23:23:43 +000075 DiagnosticsEngine &diags)
Bill Wendlinge1092df2013-02-14 08:09:20 +000076 : Context(C), LangOpts(C.getLangOpts()), CodeGenOpts(CGO), TargetOpts(TO),
77 TheModule(M), TheDataLayout(TD), TheTargetCodeGenInfo(0), Diags(diags),
John McCallf16aa102010-08-22 21:01:12 +000078 ABI(createCXXABI(*this)),
John McCallde5d3c72012-02-17 03:33:10 +000079 Types(*this),
Dan Gohman3d5aff52010-10-14 23:06:10 +000080 TBAA(0),
Peter Collingbourne6c0aa5f2011-10-06 18:29:37 +000081 VTables(*this), ObjCRuntime(0), OpenCLRuntime(0), CUDARuntime(0),
Dan Gohmanb49bd272012-02-16 00:57:37 +000082 DebugInfo(0), ARCData(0), NoObjCARCExceptionsMetadata(0),
83 RRData(0), CFConstantStringClassRef(0),
Peter Collingbourne6c0aa5f2011-10-06 18:29:37 +000084 ConstantStringClassRef(0), NSConstantStringType(0),
Daniel Dunbar673431a2010-07-16 00:00:15 +000085 VMContext(M.getContext()),
86 NSConcreteGlobalBlock(0), NSConcreteStackBlock(0),
John McCalld16c2cf2011-02-08 08:22:06 +000087 BlockObjectAssign(0), BlockObjectDispose(0),
Will Dietz4f45bc02013-01-18 11:30:38 +000088 BlockDescriptorType(0), GenericBlockLiteralType(0),
89 SanitizerBlacklist(CGO.SanitizerBlacklistFile),
90 SanOpts(SanitizerBlacklist.isIn(M) ?
91 SanitizerOptions::Disabled : LangOpts.Sanitize) {
92
Chris Lattner8b418682012-02-07 00:39:47 +000093 // Initialize the type cache.
94 llvm::LLVMContext &LLVMContext = M.getContext();
95 VoidTy = llvm::Type::getVoidTy(LLVMContext);
96 Int8Ty = llvm::Type::getInt8Ty(LLVMContext);
97 Int16Ty = llvm::Type::getInt16Ty(LLVMContext);
98 Int32Ty = llvm::Type::getInt32Ty(LLVMContext);
99 Int64Ty = llvm::Type::getInt64Ty(LLVMContext);
100 FloatTy = llvm::Type::getFloatTy(LLVMContext);
101 DoubleTy = llvm::Type::getDoubleTy(LLVMContext);
102 PointerWidthInBits = C.getTargetInfo().getPointerWidth(0);
103 PointerAlignInBytes =
104 C.toCharUnitsFromBits(C.getTargetInfo().getPointerAlign(0)).getQuantity();
105 IntTy = llvm::IntegerType::get(LLVMContext, C.getTargetInfo().getIntWidth());
106 IntPtrTy = llvm::IntegerType::get(LLVMContext, PointerWidthInBits);
107 Int8PtrTy = Int8Ty->getPointerTo(0);
108 Int8PtrPtrTy = Int8PtrTy->getPointerTo(0);
109
John McCallbd7370a2013-02-28 19:01:20 +0000110 RuntimeCC = getTargetCodeGenInfo().getABIInfo().getRuntimeCC();
111
David Blaikie4e4d0842012-03-11 07:00:24 +0000112 if (LangOpts.ObjC1)
Peter Collingbourne8c25fc52011-09-19 21:14:35 +0000113 createObjCRuntime();
David Blaikie4e4d0842012-03-11 07:00:24 +0000114 if (LangOpts.OpenCL)
Peter Collingbourne8c25fc52011-09-19 21:14:35 +0000115 createOpenCLRuntime();
David Blaikie4e4d0842012-03-11 07:00:24 +0000116 if (LangOpts.CUDA)
Peter Collingbourne6c0aa5f2011-10-06 18:29:37 +0000117 createCUDARuntime();
Sanjiv Guptae8b9f5b2008-05-08 08:54:20 +0000118
Kostya Serebryanyc9fe6052012-04-24 06:57:01 +0000119 // Enable TBAA unless it's suppressed. ThreadSanitizer needs TBAA even at O0.
Will Dietz4f45bc02013-01-18 11:30:38 +0000120 if (SanOpts.Thread ||
Kostya Serebryanyc9fe6052012-04-24 06:57:01 +0000121 (!CodeGenOpts.RelaxedAliasing && CodeGenOpts.OptimizationLevel > 0))
122 TBAA = new CodeGenTBAA(Context, VMContext, CodeGenOpts, getLangOpts(),
Dan Gohman0b5c4fc2010-10-15 20:23:12 +0000123 ABI.getMangleContext());
Dan Gohman3d5aff52010-10-14 23:06:10 +0000124
Nick Lewyckye8ba8d72011-04-21 23:44:07 +0000125 // If debug info or coverage generation is enabled, create the CGDebugInfo
126 // object.
Douglas Gregor4cdad312012-10-23 20:05:01 +0000127 if (CodeGenOpts.getDebugInfo() != CodeGenOptions::NoDebugInfo ||
Alexey Samsonov3a70cd62012-04-27 07:24:20 +0000128 CodeGenOpts.EmitGcovArcs ||
Nick Lewyckye8ba8d72011-04-21 23:44:07 +0000129 CodeGenOpts.EmitGcovNotes)
130 DebugInfo = new CGDebugInfo(*this);
John McCalld16c2cf2011-02-08 08:22:06 +0000131
132 Block.GlobalUniqueCount = 0;
John McCall5936e332011-02-15 09:22:45 +0000133
David Blaikie4e4d0842012-03-11 07:00:24 +0000134 if (C.getLangOpts().ObjCAutoRefCount)
John McCallf85e1932011-06-15 23:02:42 +0000135 ARCData = new ARCEntrypoints();
136 RRData = new RREntrypoints();
Chris Lattner2b94fe32008-03-01 08:45:05 +0000137}
138
139CodeGenModule::~CodeGenModule() {
Peter Collingbournee9265232011-07-27 20:29:46 +0000140 delete ObjCRuntime;
Peter Collingbourne8c25fc52011-09-19 21:14:35 +0000141 delete OpenCLRuntime;
Peter Collingbourne6c0aa5f2011-10-06 18:29:37 +0000142 delete CUDARuntime;
Ted Kremenek0628b722011-10-08 05:28:26 +0000143 delete TheTargetCodeGenInfo;
John McCallf16aa102010-08-22 21:01:12 +0000144 delete &ABI;
Dan Gohman4376c852010-10-15 18:04:46 +0000145 delete TBAA;
Ted Kremenek815c78f2008-08-05 18:50:11 +0000146 delete DebugInfo;
John McCallf85e1932011-06-15 23:02:42 +0000147 delete ARCData;
148 delete RRData;
Ted Kremenek815c78f2008-08-05 18:50:11 +0000149}
150
David Chisnall0d13f6f2010-01-23 02:40:42 +0000151void CodeGenModule::createObjCRuntime() {
John McCall260611a2012-06-20 06:18:46 +0000152 // This is just isGNUFamily(), but we want to force implementors of
153 // new ABIs to decide how best to do this.
154 switch (LangOpts.ObjCRuntime.getKind()) {
David Chisnall11d3f4c2012-07-03 20:49:52 +0000155 case ObjCRuntime::GNUstep:
156 case ObjCRuntime::GCC:
John McCallf7226fb2012-07-12 02:07:58 +0000157 case ObjCRuntime::ObjFW:
Peter Collingbournee9265232011-07-27 20:29:46 +0000158 ObjCRuntime = CreateGNUObjCRuntime(*this);
John McCall260611a2012-06-20 06:18:46 +0000159 return;
160
161 case ObjCRuntime::FragileMacOSX:
162 case ObjCRuntime::MacOSX:
163 case ObjCRuntime::iOS:
Peter Collingbournee9265232011-07-27 20:29:46 +0000164 ObjCRuntime = CreateMacObjCRuntime(*this);
John McCall260611a2012-06-20 06:18:46 +0000165 return;
166 }
167 llvm_unreachable("bad runtime kind");
David Chisnall0d13f6f2010-01-23 02:40:42 +0000168}
169
Peter Collingbourne8c25fc52011-09-19 21:14:35 +0000170void CodeGenModule::createOpenCLRuntime() {
171 OpenCLRuntime = new CGOpenCLRuntime(*this);
172}
173
Peter Collingbourne6c0aa5f2011-10-06 18:29:37 +0000174void CodeGenModule::createCUDARuntime() {
175 CUDARuntime = CreateNVCUDARuntime(*this);
176}
177
Ted Kremenek815c78f2008-08-05 18:50:11 +0000178void CodeGenModule::Release() {
Chris Lattner82227ff2009-03-22 21:21:57 +0000179 EmitDeferred();
Eli Friedman6c6bda32010-01-08 00:50:11 +0000180 EmitCXXGlobalInitFunc();
Daniel Dunbarefb0fa92010-03-20 04:15:41 +0000181 EmitCXXGlobalDtorFunc();
Peter Collingbournee9265232011-07-27 20:29:46 +0000182 if (ObjCRuntime)
183 if (llvm::Function *ObjCInitFunction = ObjCRuntime->ModuleInitFunction())
Daniel Dunbar208ff5e2008-08-11 18:12:00 +0000184 AddGlobalCtor(ObjCInitFunction);
Daniel Dunbar6bfed7e2008-08-01 00:01:51 +0000185 EmitCtorList(GlobalCtors, "llvm.global_ctors");
186 EmitCtorList(GlobalDtors, "llvm.global_dtors");
Julien Lerouge77f68bb2011-09-09 22:41:49 +0000187 EmitGlobalAnnotations();
Daniel Dunbar02698712009-02-13 20:29:50 +0000188 EmitLLVMUsed();
Douglas Gregorf43b7212013-01-16 01:23:41 +0000189
190 if (CodeGenOpts.ModulesAutolink) {
191 EmitModuleLinkOptions();
192 }
Douglas Gregor5d75ea72013-01-14 18:28:43 +0000193
John McCallb2593832010-09-16 06:16:50 +0000194 SimplifyPersonality();
195
John McCall744016d2010-07-06 23:57:41 +0000196 if (getCodeGenOpts().EmitDeclMetadata)
197 EmitDeclMetadata();
Nick Lewycky5ea4f442011-05-04 20:46:58 +0000198
199 if (getCodeGenOpts().EmitGcovArcs || getCodeGenOpts().EmitGcovNotes)
Nick Lewycky3dc05412011-05-05 00:08:20 +0000200 EmitCoverageFile();
Devang Patelf391dbe2011-08-16 20:58:22 +0000201
202 if (DebugInfo)
203 DebugInfo->finalize();
Daniel Dunbarf1968f22008-10-01 00:49:24 +0000204}
205
Devang Patele80d5672011-03-23 16:29:39 +0000206void CodeGenModule::UpdateCompletedType(const TagDecl *TD) {
207 // Make sure that this type is translated.
208 Types.UpdateCompletedType(TD);
Devang Patele80d5672011-03-23 16:29:39 +0000209}
210
Dan Gohman3d5aff52010-10-14 23:06:10 +0000211llvm::MDNode *CodeGenModule::getTBAAInfo(QualType QTy) {
212 if (!TBAA)
213 return 0;
214 return TBAA->getTBAAInfo(QTy);
215}
216
Kostya Serebryany8cb4a072012-03-26 17:03:51 +0000217llvm::MDNode *CodeGenModule::getTBAAInfoForVTablePtr() {
218 if (!TBAA)
219 return 0;
220 return TBAA->getTBAAInfoForVTablePtr();
221}
222
Dan Gohmanb22c7dc2012-09-28 21:58:29 +0000223llvm::MDNode *CodeGenModule::getTBAAStructInfo(QualType QTy) {
224 if (!TBAA)
225 return 0;
226 return TBAA->getTBAAStructInfo(QTy);
227}
228
Dan Gohman3d5aff52010-10-14 23:06:10 +0000229void CodeGenModule::DecorateInstruction(llvm::Instruction *Inst,
230 llvm::MDNode *TBAAInfo) {
231 Inst->setMetadata(llvm::LLVMContext::MD_tbaa, TBAAInfo);
232}
233
John McCall6374c332010-03-06 00:35:14 +0000234bool CodeGenModule::isTargetDarwin() const {
Douglas Gregorbcfd1f52011-09-02 00:18:52 +0000235 return getContext().getTargetInfo().getTriple().isOSDarwin();
John McCall6374c332010-03-06 00:35:14 +0000236}
237
Chandler Carruth0f30a122012-03-30 19:44:53 +0000238void CodeGenModule::Error(SourceLocation loc, StringRef error) {
239 unsigned diagID = getDiags().getCustomDiagID(DiagnosticsEngine::Error, error);
John McCall32096692011-03-18 02:56:14 +0000240 getDiags().Report(Context.getFullLoc(loc), diagID);
241}
242
Daniel Dunbar488e9932008-08-16 00:56:44 +0000243/// ErrorUnsupported - Print out an error that codegen doesn't support the
Chris Lattner2c8569d2007-12-02 07:19:18 +0000244/// specified stmt yet.
Daniel Dunbar90df4b62008-09-04 03:43:08 +0000245void CodeGenModule::ErrorUnsupported(const Stmt *S, const char *Type,
246 bool OmitOnError) {
247 if (OmitOnError && getDiags().hasErrorOccurred())
248 return;
David Blaikied6471f72011-09-25 23:23:43 +0000249 unsigned DiagID = getDiags().getCustomDiagID(DiagnosticsEngine::Error,
Daniel Dunbar56b80012009-02-06 19:18:03 +0000250 "cannot compile this %0 yet");
Chris Lattner2c8569d2007-12-02 07:19:18 +0000251 std::string Msg = Type;
Chris Lattner0a14eee2008-11-18 07:04:44 +0000252 getDiags().Report(Context.getFullLoc(S->getLocStart()), DiagID)
253 << Msg << S->getSourceRange();
Chris Lattner2c8569d2007-12-02 07:19:18 +0000254}
Chris Lattner58c3f9e2007-12-02 06:27:33 +0000255
Daniel Dunbar488e9932008-08-16 00:56:44 +0000256/// ErrorUnsupported - Print out an error that codegen doesn't support the
Chris Lattnerc6fdc342008-01-12 07:05:38 +0000257/// specified decl yet.
Daniel Dunbar90df4b62008-09-04 03:43:08 +0000258void CodeGenModule::ErrorUnsupported(const Decl *D, const char *Type,
259 bool OmitOnError) {
260 if (OmitOnError && getDiags().hasErrorOccurred())
261 return;
David Blaikied6471f72011-09-25 23:23:43 +0000262 unsigned DiagID = getDiags().getCustomDiagID(DiagnosticsEngine::Error,
Daniel Dunbar56b80012009-02-06 19:18:03 +0000263 "cannot compile this %0 yet");
Chris Lattnerc6fdc342008-01-12 07:05:38 +0000264 std::string Msg = Type;
Chris Lattner0a14eee2008-11-18 07:04:44 +0000265 getDiags().Report(Context.getFullLoc(D->getLocation()), DiagID) << Msg;
Chris Lattnerc6fdc342008-01-12 07:05:38 +0000266}
267
John McCallbc8d40d2011-06-24 21:55:10 +0000268llvm::ConstantInt *CodeGenModule::getSize(CharUnits size) {
269 return llvm::ConstantInt::get(SizeTy, size.getQuantity());
270}
271
Mike Stump1eb44332009-09-09 15:08:12 +0000272void CodeGenModule::setGlobalVisibility(llvm::GlobalValue *GV,
Anders Carlsson0ffeaad2011-01-29 19:39:23 +0000273 const NamedDecl *D) const {
Daniel Dunbar04d40782009-04-14 06:00:08 +0000274 // Internal definitions always have default visibility.
Chris Lattnerdf102fc2009-04-14 05:27:13 +0000275 if (GV->hasLocalLinkage()) {
Daniel Dunbar7e714cd2009-04-10 20:26:50 +0000276 GV->setVisibility(llvm::GlobalValue::DefaultVisibility);
Daniel Dunbar6ab187a2009-04-07 05:48:37 +0000277 return;
Daniel Dunbar7e714cd2009-04-10 20:26:50 +0000278 }
Daniel Dunbar6ab187a2009-04-07 05:48:37 +0000279
John McCallaf146032010-10-30 11:50:40 +0000280 // Set visibility for definitions.
Rafael Espindola2beda122013-02-27 02:15:29 +0000281 LinkageInfo LV = D->getLinkageAndVisibility();
Rafael Espindolaf127eb82013-02-27 02:56:45 +0000282 if (LV.isVisibilityExplicit() || !GV->hasAvailableExternallyLinkage())
283 GV->setVisibility(GetLLVMVisibility(LV.getVisibility()));
Dan Gohman4f8d1232008-05-22 00:50:06 +0000284}
285
Hans Wennborgde981f32012-06-28 08:01:44 +0000286static llvm::GlobalVariable::ThreadLocalMode GetLLVMTLSModel(StringRef S) {
287 return llvm::StringSwitch<llvm::GlobalVariable::ThreadLocalMode>(S)
288 .Case("global-dynamic", llvm::GlobalVariable::GeneralDynamicTLSModel)
289 .Case("local-dynamic", llvm::GlobalVariable::LocalDynamicTLSModel)
290 .Case("initial-exec", llvm::GlobalVariable::InitialExecTLSModel)
291 .Case("local-exec", llvm::GlobalVariable::LocalExecTLSModel);
292}
293
294static llvm::GlobalVariable::ThreadLocalMode GetLLVMTLSModel(
295 CodeGenOptions::TLSModel M) {
296 switch (M) {
297 case CodeGenOptions::GeneralDynamicTLSModel:
298 return llvm::GlobalVariable::GeneralDynamicTLSModel;
299 case CodeGenOptions::LocalDynamicTLSModel:
300 return llvm::GlobalVariable::LocalDynamicTLSModel;
301 case CodeGenOptions::InitialExecTLSModel:
302 return llvm::GlobalVariable::InitialExecTLSModel;
303 case CodeGenOptions::LocalExecTLSModel:
304 return llvm::GlobalVariable::LocalExecTLSModel;
305 }
306 llvm_unreachable("Invalid TLS model!");
307}
308
309void CodeGenModule::setTLSMode(llvm::GlobalVariable *GV,
310 const VarDecl &D) const {
311 assert(D.isThreadSpecified() && "setting TLS mode on non-TLS var!");
312
313 llvm::GlobalVariable::ThreadLocalMode TLM;
Douglas Gregor4cdad312012-10-23 20:05:01 +0000314 TLM = GetLLVMTLSModel(CodeGenOpts.getDefaultTLSModel());
Hans Wennborgde981f32012-06-28 08:01:44 +0000315
316 // Override the TLS model if it is explicitly specified.
317 if (D.hasAttr<TLSModelAttr>()) {
318 const TLSModelAttr *Attr = D.getAttr<TLSModelAttr>();
319 TLM = GetLLVMTLSModel(Attr->getModel());
320 }
321
322 GV->setThreadLocalMode(TLM);
323}
324
John McCallcbfe5022010-08-04 08:34:44 +0000325/// Set the symbol visibility of type information (vtable and RTTI)
326/// associated with the given type.
327void CodeGenModule::setTypeVisibility(llvm::GlobalValue *GV,
328 const CXXRecordDecl *RD,
Anders Carlssonfa2e99f2011-01-29 20:24:48 +0000329 TypeVisibilityKind TVK) const {
Anders Carlsson0ffeaad2011-01-29 19:39:23 +0000330 setGlobalVisibility(GV, RD);
John McCallcbfe5022010-08-04 08:34:44 +0000331
John McCall279b5eb2010-08-12 23:36:15 +0000332 if (!CodeGenOpts.HiddenWeakVTables)
333 return;
334
Anders Carlsson9a86a132011-01-29 20:36:11 +0000335 // We never want to drop the visibility for RTTI names.
336 if (TVK == TVK_ForRTTIName)
337 return;
338
John McCallcbfe5022010-08-04 08:34:44 +0000339 // We want to drop the visibility to hidden for weak type symbols.
340 // This isn't possible if there might be unresolved references
341 // elsewhere that rely on this symbol being visible.
342
John McCall7a536902010-08-05 20:39:18 +0000343 // This should be kept roughly in sync with setThunkVisibility
344 // in CGVTables.cpp.
345
John McCallcbfe5022010-08-04 08:34:44 +0000346 // Preconditions.
Anders Carlssonf502d932011-01-24 00:46:19 +0000347 if (GV->getLinkage() != llvm::GlobalVariable::LinkOnceODRLinkage ||
John McCallcbfe5022010-08-04 08:34:44 +0000348 GV->getVisibility() != llvm::GlobalVariable::DefaultVisibility)
349 return;
350
351 // Don't override an explicit visibility attribute.
John McCalld4c3d662013-02-20 01:54:26 +0000352 if (RD->getExplicitVisibility(NamedDecl::VisibilityForType))
John McCallcbfe5022010-08-04 08:34:44 +0000353 return;
354
355 switch (RD->getTemplateSpecializationKind()) {
356 // We have to disable the optimization if this is an EI definition
357 // because there might be EI declarations in other shared objects.
358 case TSK_ExplicitInstantiationDefinition:
359 case TSK_ExplicitInstantiationDeclaration:
360 return;
361
John McCall7a536902010-08-05 20:39:18 +0000362 // Every use of a non-template class's type information has to emit it.
John McCallcbfe5022010-08-04 08:34:44 +0000363 case TSK_Undeclared:
364 break;
365
John McCall7a536902010-08-05 20:39:18 +0000366 // In theory, implicit instantiations can ignore the possibility of
367 // an explicit instantiation declaration because there necessarily
368 // must be an EI definition somewhere with default visibility. In
369 // practice, it's possible to have an explicit instantiation for
370 // an arbitrary template class, and linkers aren't necessarily able
371 // to deal with mixed-visibility symbols.
372 case TSK_ExplicitSpecialization:
John McCallcbfe5022010-08-04 08:34:44 +0000373 case TSK_ImplicitInstantiation:
Douglas Gregoraafd1112012-10-24 14:11:55 +0000374 return;
John McCallcbfe5022010-08-04 08:34:44 +0000375 }
376
377 // If there's a key function, there may be translation units
378 // that don't have the key function's definition. But ignore
379 // this if we're emitting RTTI under -fno-rtti.
David Blaikie4e4d0842012-03-11 07:00:24 +0000380 if (!(TVK != TVK_ForRTTI) || LangOpts.RTTI) {
John McCalld5617ee2013-01-25 22:31:03 +0000381 // FIXME: what should we do if we "lose" the key function during
382 // the emission of the file?
383 if (Context.getCurrentKeyFunction(RD))
John McCallcbfe5022010-08-04 08:34:44 +0000384 return;
Anders Carlssonfa2e99f2011-01-29 20:24:48 +0000385 }
John McCallcbfe5022010-08-04 08:34:44 +0000386
387 // Otherwise, drop the visibility to hidden.
388 GV->setVisibility(llvm::GlobalValue::HiddenVisibility);
Rafael Espindolab1c65ff2011-01-11 21:44:37 +0000389 GV->setUnnamedAddr(true);
John McCallcbfe5022010-08-04 08:34:44 +0000390}
391
Chris Lattner5f9e2722011-07-23 10:55:15 +0000392StringRef CodeGenModule::getMangledName(GlobalDecl GD) {
Anders Carlsson793a9902010-06-22 16:05:32 +0000393 const NamedDecl *ND = cast<NamedDecl>(GD.getDecl());
394
Chris Lattner5f9e2722011-07-23 10:55:15 +0000395 StringRef &Str = MangledDeclNames[GD.getCanonicalDecl()];
Anders Carlsson793a9902010-06-22 16:05:32 +0000396 if (!Str.empty())
397 return Str;
398
John McCall4c40d982010-08-31 07:33:07 +0000399 if (!getCXXABI().getMangleContext().shouldMangleDeclName(ND)) {
Anders Carlsson793a9902010-06-22 16:05:32 +0000400 IdentifierInfo *II = ND->getIdentifier();
401 assert(II && "Attempt to mangle unnamed decl.");
402
403 Str = II->getName();
404 return Str;
405 }
406
Dylan Noblesmithf7ccbad2012-02-05 02:13:05 +0000407 SmallString<256> Buffer;
Rafael Espindolac4850c22011-02-10 23:59:36 +0000408 llvm::raw_svector_ostream Out(Buffer);
Anders Carlsson793a9902010-06-22 16:05:32 +0000409 if (const CXXConstructorDecl *D = dyn_cast<CXXConstructorDecl>(ND))
Rafael Espindolac4850c22011-02-10 23:59:36 +0000410 getCXXABI().getMangleContext().mangleCXXCtor(D, GD.getCtorType(), Out);
Anders Carlsson793a9902010-06-22 16:05:32 +0000411 else if (const CXXDestructorDecl *D = dyn_cast<CXXDestructorDecl>(ND))
Rafael Espindolac4850c22011-02-10 23:59:36 +0000412 getCXXABI().getMangleContext().mangleCXXDtor(D, GD.getDtorType(), Out);
Anders Carlsson793a9902010-06-22 16:05:32 +0000413 else if (const BlockDecl *BD = dyn_cast<BlockDecl>(ND))
Fariborz Jahanian4904bf42012-06-26 16:06:38 +0000414 getCXXABI().getMangleContext().mangleBlock(BD, Out,
415 dyn_cast_or_null<VarDecl>(initializedGlobalDecl.getDecl()));
Anders Carlsson793a9902010-06-22 16:05:32 +0000416 else
Rafael Espindolac4850c22011-02-10 23:59:36 +0000417 getCXXABI().getMangleContext().mangleName(ND, Out);
Anders Carlsson793a9902010-06-22 16:05:32 +0000418
419 // Allocate space for the mangled name.
Rafael Espindolac4850c22011-02-10 23:59:36 +0000420 Out.flush();
Anders Carlsson793a9902010-06-22 16:05:32 +0000421 size_t Length = Buffer.size();
422 char *Name = MangledNamesAllocator.Allocate<char>(Length);
423 std::copy(Buffer.begin(), Buffer.end(), Name);
424
Chris Lattner5f9e2722011-07-23 10:55:15 +0000425 Str = StringRef(Name, Length);
Anders Carlsson793a9902010-06-22 16:05:32 +0000426
427 return Str;
428}
429
Peter Collingbourne14110472011-01-13 18:57:25 +0000430void CodeGenModule::getBlockMangledName(GlobalDecl GD, MangleBuffer &Buffer,
431 const BlockDecl *BD) {
432 MangleContext &MangleCtx = getCXXABI().getMangleContext();
433 const Decl *D = GD.getDecl();
Rafael Espindolac4850c22011-02-10 23:59:36 +0000434 llvm::raw_svector_ostream Out(Buffer.getBuffer());
Peter Collingbourne14110472011-01-13 18:57:25 +0000435 if (D == 0)
Fariborz Jahanian4904bf42012-06-26 16:06:38 +0000436 MangleCtx.mangleGlobalBlock(BD,
437 dyn_cast_or_null<VarDecl>(initializedGlobalDecl.getDecl()), Out);
Peter Collingbourne14110472011-01-13 18:57:25 +0000438 else if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(D))
Rafael Espindolac4850c22011-02-10 23:59:36 +0000439 MangleCtx.mangleCtorBlock(CD, GD.getCtorType(), BD, Out);
Peter Collingbourne14110472011-01-13 18:57:25 +0000440 else if (const CXXDestructorDecl *DD = dyn_cast<CXXDestructorDecl>(D))
Rafael Espindolac4850c22011-02-10 23:59:36 +0000441 MangleCtx.mangleDtorBlock(DD, GD.getDtorType(), BD, Out);
Peter Collingbourne14110472011-01-13 18:57:25 +0000442 else
Rafael Espindolac4850c22011-02-10 23:59:36 +0000443 MangleCtx.mangleBlock(cast<DeclContext>(D), BD, Out);
Anders Carlsson9a8822b2010-06-09 02:36:32 +0000444}
445
Chris Lattner5f9e2722011-07-23 10:55:15 +0000446llvm::GlobalValue *CodeGenModule::GetGlobalValue(StringRef Name) {
John McCallf746aa62010-03-19 23:29:14 +0000447 return getModule().getNamedValue(Name);
Douglas Gregor5f2bfd42009-02-13 00:10:09 +0000448}
449
Chris Lattner6d397602008-03-14 17:18:18 +0000450/// AddGlobalCtor - Add a function to the list that will be called before
451/// main() runs.
Daniel Dunbar6bfed7e2008-08-01 00:01:51 +0000452void CodeGenModule::AddGlobalCtor(llvm::Function * Ctor, int Priority) {
Daniel Dunbar49988882009-01-13 02:25:00 +0000453 // FIXME: Type coercion of void()* types.
Daniel Dunbar6bfed7e2008-08-01 00:01:51 +0000454 GlobalCtors.push_back(std::make_pair(Ctor, Priority));
Chris Lattner6d397602008-03-14 17:18:18 +0000455}
456
Daniel Dunbar6bfed7e2008-08-01 00:01:51 +0000457/// AddGlobalDtor - Add a function to the list that will be called
458/// when the module is unloaded.
459void CodeGenModule::AddGlobalDtor(llvm::Function * Dtor, int Priority) {
Daniel Dunbar49988882009-01-13 02:25:00 +0000460 // FIXME: Type coercion of void()* types.
Daniel Dunbar6bfed7e2008-08-01 00:01:51 +0000461 GlobalDtors.push_back(std::make_pair(Dtor, Priority));
462}
463
464void CodeGenModule::EmitCtorList(const CtorList &Fns, const char *GlobalName) {
465 // Ctor function type is void()*.
John McCall0774cb82011-05-15 01:53:33 +0000466 llvm::FunctionType* CtorFTy = llvm::FunctionType::get(VoidTy, false);
Owen Anderson96e0fc72009-07-29 22:16:19 +0000467 llvm::Type *CtorPFTy = llvm::PointerType::getUnqual(CtorFTy);
Daniel Dunbar6bfed7e2008-08-01 00:01:51 +0000468
469 // Get the type of a ctor entry, { i32, void ()* }.
Chris Lattnerc5cbb902011-06-20 04:01:35 +0000470 llvm::StructType *CtorStructTy =
Chris Lattner8b418682012-02-07 00:39:47 +0000471 llvm::StructType::get(Int32Ty, llvm::PointerType::getUnqual(CtorFTy), NULL);
Chris Lattner6d397602008-03-14 17:18:18 +0000472
Daniel Dunbar6bfed7e2008-08-01 00:01:51 +0000473 // Construct the constructor and destructor arrays.
Chris Lattner0b239712012-02-06 22:16:34 +0000474 SmallVector<llvm::Constant*, 8> Ctors;
Daniel Dunbar6bfed7e2008-08-01 00:01:51 +0000475 for (CtorList::const_iterator I = Fns.begin(), E = Fns.end(); I != E; ++I) {
Chris Lattner0b239712012-02-06 22:16:34 +0000476 llvm::Constant *S[] = {
477 llvm::ConstantInt::get(Int32Ty, I->second, false),
478 llvm::ConstantExpr::getBitCast(I->first, CtorPFTy)
479 };
Owen Anderson08e25242009-07-27 22:29:56 +0000480 Ctors.push_back(llvm::ConstantStruct::get(CtorStructTy, S));
Chris Lattner6d397602008-03-14 17:18:18 +0000481 }
Daniel Dunbar6bfed7e2008-08-01 00:01:51 +0000482
483 if (!Ctors.empty()) {
Owen Anderson96e0fc72009-07-29 22:16:19 +0000484 llvm::ArrayType *AT = llvm::ArrayType::get(CtorStructTy, Ctors.size());
Owen Anderson1c431b32009-07-08 19:05:04 +0000485 new llvm::GlobalVariable(TheModule, AT, false,
Daniel Dunbar6bfed7e2008-08-01 00:01:51 +0000486 llvm::GlobalValue::AppendingLinkage,
Owen Anderson7db6d832009-07-28 18:33:04 +0000487 llvm::ConstantArray::get(AT, Ctors),
Owen Anderson1c431b32009-07-08 19:05:04 +0000488 GlobalName);
Daniel Dunbar6bfed7e2008-08-01 00:01:51 +0000489 }
Chris Lattner6d397602008-03-14 17:18:18 +0000490}
491
John McCalld46f9852010-02-19 01:32:20 +0000492llvm::GlobalValue::LinkageTypes
493CodeGenModule::getFunctionLinkage(const FunctionDecl *D) {
Argyrios Kyrtzidis90e99a82010-07-29 18:15:58 +0000494 GVALinkage Linkage = getContext().GetGVALinkageForFunction(D);
Daniel Dunbar7c65e992009-04-14 08:05:55 +0000495
Chris Lattnerf81530652010-06-30 16:58:07 +0000496 if (Linkage == GVA_Internal)
John McCalld46f9852010-02-19 01:32:20 +0000497 return llvm::Function::InternalLinkage;
Chris Lattnerf81530652010-06-30 16:58:07 +0000498
499 if (D->hasAttr<DLLExportAttr>())
John McCalld46f9852010-02-19 01:32:20 +0000500 return llvm::Function::DLLExportLinkage;
Chris Lattnerf81530652010-06-30 16:58:07 +0000501
502 if (D->hasAttr<WeakAttr>())
John McCalld46f9852010-02-19 01:32:20 +0000503 return llvm::Function::WeakAnyLinkage;
Chris Lattnerf81530652010-06-30 16:58:07 +0000504
505 // In C99 mode, 'inline' functions are guaranteed to have a strong
506 // definition somewhere else, so we can use available_externally linkage.
507 if (Linkage == GVA_C99Inline)
Fariborz Jahanianfd0f89d2011-02-04 00:08:13 +0000508 return llvm::Function::AvailableExternallyLinkage;
John McCall5584d912011-09-19 18:05:26 +0000509
510 // Note that Apple's kernel linker doesn't support symbol
511 // coalescing, so we need to avoid linkonce and weak linkages there.
512 // Normally, this means we just map to internal, but for explicit
513 // instantiations we'll map to external.
514
Chris Lattnerf81530652010-06-30 16:58:07 +0000515 // In C++, the compiler has to emit a definition in every translation unit
516 // that references the function. We should use linkonce_odr because
517 // a) if all references in this translation unit are optimized away, we
518 // don't need to codegen it. b) if the function persists, it needs to be
519 // merged with other definitions. c) C++ has the ODR, so we know the
520 // definition is dependable.
521 if (Linkage == GVA_CXXInline || Linkage == GVA_TemplateInstantiation)
David Blaikie4e4d0842012-03-11 07:00:24 +0000522 return !Context.getLangOpts().AppleKext
Fariborz Jahanian142f9e92011-02-04 00:01:24 +0000523 ? llvm::Function::LinkOnceODRLinkage
524 : llvm::Function::InternalLinkage;
Chris Lattnerf81530652010-06-30 16:58:07 +0000525
526 // An explicit instantiation of a template has weak linkage, since
527 // explicit instantiations can occur in multiple translation units
528 // and must all be equivalent. However, we are not allowed to
529 // throw away these explicit instantiations.
530 if (Linkage == GVA_ExplicitTemplateInstantiation)
David Blaikie4e4d0842012-03-11 07:00:24 +0000531 return !Context.getLangOpts().AppleKext
Fariborz Jahanian142f9e92011-02-04 00:01:24 +0000532 ? llvm::Function::WeakODRLinkage
John McCall5584d912011-09-19 18:05:26 +0000533 : llvm::Function::ExternalLinkage;
Chris Lattnerf81530652010-06-30 16:58:07 +0000534
535 // Otherwise, we have strong external linkage.
536 assert(Linkage == GVA_StrongExternal);
537 return llvm::Function::ExternalLinkage;
John McCalld46f9852010-02-19 01:32:20 +0000538}
Nuno Lopesd4cbda62008-06-08 15:45:52 +0000539
John McCalld46f9852010-02-19 01:32:20 +0000540
541/// SetFunctionDefinitionAttributes - Set attributes for a global.
542///
543/// FIXME: This is currently only done for aliases and functions, but not for
544/// variables (these details are set in EmitGlobalVarDefinition for variables).
545void CodeGenModule::SetFunctionDefinitionAttributes(const FunctionDecl *D,
546 llvm::GlobalValue *GV) {
Daniel Dunbar7c65e992009-04-14 08:05:55 +0000547 SetCommonAttributes(D, GV);
Nuno Lopesd4cbda62008-06-08 15:45:52 +0000548}
549
Daniel Dunbar7dbd8192009-04-14 07:08:30 +0000550void CodeGenModule::SetLLVMFunctionAttributes(const Decl *D,
Mike Stump1eb44332009-09-09 15:08:12 +0000551 const CGFunctionInfo &Info,
Daniel Dunbar7dbd8192009-04-14 07:08:30 +0000552 llvm::Function *F) {
Daniel Dunbarca6408c2009-09-12 00:59:20 +0000553 unsigned CallingConv;
Devang Patel761d7f72008-09-25 21:02:23 +0000554 AttributeListType AttributeList;
Bill Wendling94236e72013-02-22 00:13:35 +0000555 ConstructAttributeList(Info, D, AttributeList, CallingConv, false);
Bill Wendling785b7782012-12-07 23:17:26 +0000556 F->setAttributes(llvm::AttributeSet::get(getLLVMContext(), AttributeList));
Daniel Dunbarca6408c2009-09-12 00:59:20 +0000557 F->setCallingConv(static_cast<llvm::CallingConv::ID>(CallingConv));
Daniel Dunbarf80519b2008-09-04 23:41:35 +0000558}
559
John McCalld1e40d52011-10-02 01:16:38 +0000560/// Determines whether the language options require us to model
561/// unwind exceptions. We treat -fexceptions as mandating this
562/// except under the fragile ObjC ABI with only ObjC exceptions
563/// enabled. This means, for example, that C with -fexceptions
564/// enables this.
David Blaikie4e4d0842012-03-11 07:00:24 +0000565static bool hasUnwindExceptions(const LangOptions &LangOpts) {
John McCalld1e40d52011-10-02 01:16:38 +0000566 // If exceptions are completely disabled, obviously this is false.
David Blaikie4e4d0842012-03-11 07:00:24 +0000567 if (!LangOpts.Exceptions) return false;
John McCalld1e40d52011-10-02 01:16:38 +0000568
569 // If C++ exceptions are enabled, this is true.
David Blaikie4e4d0842012-03-11 07:00:24 +0000570 if (LangOpts.CXXExceptions) return true;
John McCalld1e40d52011-10-02 01:16:38 +0000571
572 // If ObjC exceptions are enabled, this depends on the ABI.
David Blaikie4e4d0842012-03-11 07:00:24 +0000573 if (LangOpts.ObjCExceptions) {
David Chisnall11d3f4c2012-07-03 20:49:52 +0000574 return LangOpts.ObjCRuntime.hasUnwindExceptions();
John McCalld1e40d52011-10-02 01:16:38 +0000575 }
576
577 return true;
578}
579
Daniel Dunbar7c65e992009-04-14 08:05:55 +0000580void CodeGenModule::SetLLVMFunctionAttributesForDefinition(const Decl *D,
581 llvm::Function *F) {
Rafael Espindolaabca5a12011-05-25 03:44:55 +0000582 if (CodeGenOpts.UnwindTables)
583 F->setHasUWTable();
584
David Blaikie4e4d0842012-03-11 07:00:24 +0000585 if (!hasUnwindExceptions(LangOpts))
Bill Wendling72390b32012-12-20 19:27:06 +0000586 F->addFnAttr(llvm::Attribute::NoUnwind);
Daniel Dunbaraf668b02008-10-28 00:17:57 +0000587
Eli Friedman2873aee2011-08-22 23:55:33 +0000588 if (D->hasAttr<NakedAttr>()) {
589 // Naked implies noinline: we should not be inlining such functions.
Bill Wendling72390b32012-12-20 19:27:06 +0000590 F->addFnAttr(llvm::Attribute::Naked);
591 F->addFnAttr(llvm::Attribute::NoInline);
Eli Friedman2873aee2011-08-22 23:55:33 +0000592 }
Daniel Dunbardd0cb222010-09-29 18:20:25 +0000593
Mike Stump1feade82009-08-26 22:31:08 +0000594 if (D->hasAttr<NoInlineAttr>())
Bill Wendling72390b32012-12-20 19:27:06 +0000595 F->addFnAttr(llvm::Attribute::NoInline);
Mike Stumpf55314d2009-10-05 21:58:44 +0000596
Eli Friedman2873aee2011-08-22 23:55:33 +0000597 // (noinline wins over always_inline, and we can't specify both in IR)
Michael J. Spenceradc6cbf2012-06-18 07:00:48 +0000598 if ((D->hasAttr<AlwaysInlineAttr>() || D->hasAttr<ForceInlineAttr>()) &&
Bill Wendling01ad9542012-12-30 10:32:17 +0000599 !F->getAttributes().hasAttribute(llvm::AttributeSet::FunctionIndex,
600 llvm::Attribute::NoInline))
Bill Wendling72390b32012-12-20 19:27:06 +0000601 F->addFnAttr(llvm::Attribute::AlwaysInline);
Eli Friedman2873aee2011-08-22 23:55:33 +0000602
Benjamin Krameree409a92012-05-12 21:10:52 +0000603 // FIXME: Communicate hot and cold attributes to LLVM more directly.
604 if (D->hasAttr<ColdAttr>())
Bill Wendling72390b32012-12-20 19:27:06 +0000605 F->addFnAttr(llvm::Attribute::OptimizeForSize);
Benjamin Krameree409a92012-05-12 21:10:52 +0000606
Quentin Colombetaee56fa2012-11-01 23:55:47 +0000607 if (D->hasAttr<MinSizeAttr>())
Bill Wendling72390b32012-12-20 19:27:06 +0000608 F->addFnAttr(llvm::Attribute::MinSize);
Quentin Colombetaee56fa2012-11-01 23:55:47 +0000609
Rafael Espindolac5f657f2011-01-11 00:26:26 +0000610 if (isa<CXXConstructorDecl>(D) || isa<CXXDestructorDecl>(D))
611 F->setUnnamedAddr(true);
612
Richard Smithef4d5ce2012-09-28 22:46:07 +0000613 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D))
614 if (MD->isVirtual())
615 F->setUnnamedAddr(true);
616
David Blaikie4e4d0842012-03-11 07:00:24 +0000617 if (LangOpts.getStackProtector() == LangOptions::SSPOn)
Bill Wendling72390b32012-12-20 19:27:06 +0000618 F->addFnAttr(llvm::Attribute::StackProtect);
David Blaikie4e4d0842012-03-11 07:00:24 +0000619 else if (LangOpts.getStackProtector() == LangOptions::SSPReq)
Bill Wendling72390b32012-12-20 19:27:06 +0000620 F->addFnAttr(llvm::Attribute::StackProtectReq);
Will Dietz4f45bc02013-01-18 11:30:38 +0000621
Kostya Serebryany85aee962013-02-26 06:58:27 +0000622 // When AddressSanitizer is enabled, set SanitizeAddress attribute
623 // unless __attribute__((no_sanitize_address)) is used.
624 if (SanOpts.Address && !D->hasAttr<NoSanitizeAddressAttr>())
625 F->addFnAttr(llvm::Attribute::SanitizeAddress);
626 // Same for ThreadSanitizer and __attribute__((no_sanitize_thread))
627 if (SanOpts.Thread && !D->hasAttr<NoSanitizeThreadAttr>())
628 F->addFnAttr(llvm::Attribute::SanitizeThread);
629 // Same for MemorySanitizer and __attribute__((no_sanitize_memory))
630 if (SanOpts.Memory && !D->hasAttr<NoSanitizeMemoryAttr>())
631 F->addFnAttr(llvm::Attribute::SanitizeMemory);
Alexander Potapenko89651ea2012-02-02 11:49:28 +0000632
Sean Huntcf807c42010-08-18 23:23:40 +0000633 unsigned alignment = D->getMaxAlignment() / Context.getCharWidth();
634 if (alignment)
635 F->setAlignment(alignment);
636
Mike Stumpfb51ddf2009-10-05 22:49:20 +0000637 // C++ ABI requires 2-byte alignment for member functions.
Mike Stumpbd6dbd12009-10-05 23:08:21 +0000638 if (F->getAlignment() < 2 && isa<CXXMethodDecl>(D))
639 F->setAlignment(2);
Daniel Dunbarf80519b2008-09-04 23:41:35 +0000640}
641
Mike Stump1eb44332009-09-09 15:08:12 +0000642void CodeGenModule::SetCommonAttributes(const Decl *D,
Daniel Dunbar7c65e992009-04-14 08:05:55 +0000643 llvm::GlobalValue *GV) {
Anders Carlsson934176f2011-01-29 19:41:00 +0000644 if (const NamedDecl *ND = dyn_cast<NamedDecl>(D))
645 setGlobalVisibility(GV, ND);
John McCall1fb0caa2010-10-22 21:05:15 +0000646 else
647 GV->setVisibility(llvm::GlobalValue::DefaultVisibility);
Daniel Dunbar7c65e992009-04-14 08:05:55 +0000648
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +0000649 if (D->hasAttr<UsedAttr>())
Daniel Dunbar7c65e992009-04-14 08:05:55 +0000650 AddUsedGlobal(GV);
651
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +0000652 if (const SectionAttr *SA = D->getAttr<SectionAttr>())
Daniel Dunbar7c65e992009-04-14 08:05:55 +0000653 GV->setSection(SA->getName());
Anton Korobeynikov82d0a412010-01-10 12:58:08 +0000654
655 getTargetCodeGenInfo().SetTargetAttributes(D, GV, *this);
Daniel Dunbar7c65e992009-04-14 08:05:55 +0000656}
657
Daniel Dunbar0e4f40e2009-04-17 00:48:04 +0000658void CodeGenModule::SetInternalFunctionAttributes(const Decl *D,
659 llvm::Function *F,
660 const CGFunctionInfo &FI) {
661 SetLLVMFunctionAttributes(D, FI, F);
662 SetLLVMFunctionAttributesForDefinition(D, F);
Daniel Dunbar7c65e992009-04-14 08:05:55 +0000663
664 F->setLinkage(llvm::Function::InternalLinkage);
665
Daniel Dunbar0e4f40e2009-04-17 00:48:04 +0000666 SetCommonAttributes(D, F);
Daniel Dunbarf80519b2008-09-04 23:41:35 +0000667}
668
Anders Carlssonb2bcf1c2010-02-06 02:44:09 +0000669void CodeGenModule::SetFunctionAttributes(GlobalDecl GD,
Eli Friedmanc6c14d12009-05-26 01:22:57 +0000670 llvm::Function *F,
671 bool IsIncompleteFunction) {
Peter Collingbourne0ac2cf42011-04-06 12:29:04 +0000672 if (unsigned IID = F->getIntrinsicID()) {
673 // If this is an intrinsic function, set the function's attributes
674 // to the intrinsic's attributes.
Bill Wendling50e6b182012-10-15 04:47:45 +0000675 F->setAttributes(llvm::Intrinsic::getAttributes(getLLVMContext(),
676 (llvm::Intrinsic::ID)IID));
Peter Collingbourne0ac2cf42011-04-06 12:29:04 +0000677 return;
678 }
679
Anders Carlssonb2bcf1c2010-02-06 02:44:09 +0000680 const FunctionDecl *FD = cast<FunctionDecl>(GD.getDecl());
681
Eli Friedmanc6c14d12009-05-26 01:22:57 +0000682 if (!IsIncompleteFunction)
John McCallde5d3c72012-02-17 03:33:10 +0000683 SetLLVMFunctionAttributes(FD, getTypes().arrangeGlobalDeclaration(GD), F);
Mike Stump1eb44332009-09-09 15:08:12 +0000684
Daniel Dunbar7c65e992009-04-14 08:05:55 +0000685 // Only a few attributes are set on declarations; these may later be
686 // overridden by a definition.
Mike Stump1eb44332009-09-09 15:08:12 +0000687
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +0000688 if (FD->hasAttr<DLLImportAttr>()) {
Daniel Dunbar7c65e992009-04-14 08:05:55 +0000689 F->setLinkage(llvm::Function::DLLImportLinkage);
Mike Stump1eb44332009-09-09 15:08:12 +0000690 } else if (FD->hasAttr<WeakAttr>() ||
Douglas Gregor0a0d2b12011-03-23 00:50:03 +0000691 FD->isWeakImported()) {
Daniel Dunbar7c65e992009-04-14 08:05:55 +0000692 // "extern_weak" is overloaded in LLVM; we probably should have
Mike Stump1eb44332009-09-09 15:08:12 +0000693 // separate linkage types for this.
Daniel Dunbar7c65e992009-04-14 08:05:55 +0000694 F->setLinkage(llvm::Function::ExternalWeakLinkage);
695 } else {
Mike Stump1eb44332009-09-09 15:08:12 +0000696 F->setLinkage(llvm::Function::ExternalLinkage);
John McCallaf146032010-10-30 11:50:40 +0000697
Rafael Espindola2beda122013-02-27 02:15:29 +0000698 LinkageInfo LV = FD->getLinkageAndVisibility();
Rafael Espindolaf127eb82013-02-27 02:56:45 +0000699 if (LV.getLinkage() == ExternalLinkage && LV.isVisibilityExplicit()) {
700 F->setVisibility(GetLLVMVisibility(LV.getVisibility()));
John McCallaf146032010-10-30 11:50:40 +0000701 }
Daniel Dunbar7c65e992009-04-14 08:05:55 +0000702 }
703
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +0000704 if (const SectionAttr *SA = FD->getAttr<SectionAttr>())
Daniel Dunbar7c65e992009-04-14 08:05:55 +0000705 F->setSection(SA->getName());
Daniel Dunbar219df662008-09-08 23:44:31 +0000706}
707
Daniel Dunbar02698712009-02-13 20:29:50 +0000708void CodeGenModule::AddUsedGlobal(llvm::GlobalValue *GV) {
Mike Stump1eb44332009-09-09 15:08:12 +0000709 assert(!GV->isDeclaration() &&
Daniel Dunbar02698712009-02-13 20:29:50 +0000710 "Only globals with definition can force usage.");
Chris Lattner35f38a22009-03-31 22:37:52 +0000711 LLVMUsed.push_back(GV);
Daniel Dunbar02698712009-02-13 20:29:50 +0000712}
713
714void CodeGenModule::EmitLLVMUsed() {
715 // Don't create llvm.used if there is no need.
Chris Lattnerad64e022009-07-17 23:57:13 +0000716 if (LLVMUsed.empty())
Daniel Dunbar02698712009-02-13 20:29:50 +0000717 return;
718
Chris Lattner35f38a22009-03-31 22:37:52 +0000719 // Convert LLVMUsed to what ConstantArray needs.
Chris Lattner0b239712012-02-06 22:16:34 +0000720 SmallVector<llvm::Constant*, 8> UsedArray;
Chris Lattner35f38a22009-03-31 22:37:52 +0000721 UsedArray.resize(LLVMUsed.size());
722 for (unsigned i = 0, e = LLVMUsed.size(); i != e; ++i) {
Mike Stump1eb44332009-09-09 15:08:12 +0000723 UsedArray[i] =
724 llvm::ConstantExpr::getBitCast(cast<llvm::Constant>(&*LLVMUsed[i]),
Chris Lattner0b239712012-02-06 22:16:34 +0000725 Int8PtrTy);
Chris Lattner35f38a22009-03-31 22:37:52 +0000726 }
Mike Stump1eb44332009-09-09 15:08:12 +0000727
Fariborz Jahanianc38e9af2009-06-23 21:47:46 +0000728 if (UsedArray.empty())
729 return;
Chris Lattner0b239712012-02-06 22:16:34 +0000730 llvm::ArrayType *ATy = llvm::ArrayType::get(Int8PtrTy, UsedArray.size());
Mike Stump1eb44332009-09-09 15:08:12 +0000731
732 llvm::GlobalVariable *GV =
733 new llvm::GlobalVariable(getModule(), ATy, false,
Daniel Dunbar02698712009-02-13 20:29:50 +0000734 llvm::GlobalValue::AppendingLinkage,
Owen Anderson7db6d832009-07-28 18:33:04 +0000735 llvm::ConstantArray::get(ATy, UsedArray),
Owen Anderson1c431b32009-07-08 19:05:04 +0000736 "llvm.used");
Daniel Dunbar02698712009-02-13 20:29:50 +0000737
738 GV->setSection("llvm.metadata");
739}
740
Douglas Gregor858afb32013-01-14 20:53:57 +0000741/// \brief Add link options implied by the given module, including modules
742/// it depends on, using a postorder walk.
743static void addLinkOptionsPostorder(llvm::LLVMContext &Context,
744 Module *Mod,
Daniel Dunbarf9d03c12013-01-17 01:35:06 +0000745 SmallVectorImpl<llvm::Value *> &Metadata,
Douglas Gregor858afb32013-01-14 20:53:57 +0000746 llvm::SmallPtrSet<Module *, 16> &Visited) {
747 // Import this module's parent.
748 if (Mod->Parent && Visited.insert(Mod->Parent)) {
749 addLinkOptionsPostorder(Context, Mod->Parent, Metadata, Visited);
750 }
751
752 // Import this module's dependencies.
753 for (unsigned I = Mod->Imports.size(); I > 0; --I) {
754 if (Visited.insert(Mod->Imports[I-1]))
755 addLinkOptionsPostorder(Context, Mod->Imports[I-1], Metadata, Visited);
756 }
757
758 // Add linker options to link against the libraries/frameworks
759 // described by this module.
760 for (unsigned I = Mod->LinkLibraries.size(); I > 0; --I) {
761 // FIXME: -lfoo is Unix-centric and -framework Foo is Darwin-centric.
762 // We need to know more about the linker to know how to encode these
763 // options propertly.
764
765 // Link against a framework.
766 if (Mod->LinkLibraries[I-1].IsFramework) {
767 llvm::Value *Args[2] = {
768 llvm::MDString::get(Context, "-framework"),
769 llvm::MDString::get(Context, Mod->LinkLibraries[I-1].Library)
770 };
771
772 Metadata.push_back(llvm::MDNode::get(Context, Args));
773 continue;
774 }
775
776 // Link against a library.
777 llvm::Value *OptString
778 = llvm::MDString::get(Context,
779 "-l" + Mod->LinkLibraries[I-1].Library);
780 Metadata.push_back(llvm::MDNode::get(Context, OptString));
781 }
782}
783
784void CodeGenModule::EmitModuleLinkOptions() {
785 // Collect the set of all of the modules we want to visit to emit link
786 // options, which is essentially the imported modules and all of their
787 // non-explicit child modules.
788 llvm::SetVector<clang::Module *> LinkModules;
789 llvm::SmallPtrSet<clang::Module *, 16> Visited;
790 SmallVector<clang::Module *, 16> Stack;
791
792 // Seed the stack with imported modules.
793 for (llvm::SetVector<clang::Module *>::iterator M = ImportedModules.begin(),
794 MEnd = ImportedModules.end();
795 M != MEnd; ++M) {
796 if (Visited.insert(*M))
797 Stack.push_back(*M);
798 }
799
800 // Find all of the modules to import, making a little effort to prune
801 // non-leaf modules.
802 while (!Stack.empty()) {
803 clang::Module *Mod = Stack.back();
804 Stack.pop_back();
805
806 bool AnyChildren = false;
807
808 // Visit the submodules of this module.
809 for (clang::Module::submodule_iterator Sub = Mod->submodule_begin(),
810 SubEnd = Mod->submodule_end();
811 Sub != SubEnd; ++Sub) {
812 // Skip explicit children; they need to be explicitly imported to be
813 // linked against.
814 if ((*Sub)->IsExplicit)
815 continue;
816
817 if (Visited.insert(*Sub)) {
818 Stack.push_back(*Sub);
819 AnyChildren = true;
820 }
821 }
822
823 // We didn't find any children, so add this module to the list of
824 // modules to link against.
825 if (!AnyChildren) {
826 LinkModules.insert(Mod);
827 }
828 }
829
830 // Add link options for all of the imported modules in reverse topological
831 // order.
Daniel Dunbarf9d03c12013-01-17 01:35:06 +0000832 SmallVector<llvm::Value *, 16> MetadataArgs;
Douglas Gregor858afb32013-01-14 20:53:57 +0000833 Visited.clear();
834 for (llvm::SetVector<clang::Module *>::iterator M = LinkModules.begin(),
835 MEnd = LinkModules.end();
836 M != MEnd; ++M) {
837 if (Visited.insert(*M))
838 addLinkOptionsPostorder(getLLVMContext(), *M, MetadataArgs, Visited);
839 }
Daniel Dunbarf9d03c12013-01-17 01:35:06 +0000840 std::reverse(MetadataArgs.begin(), MetadataArgs.end());
Douglas Gregor858afb32013-01-14 20:53:57 +0000841
Daniel Dunbarf9d03c12013-01-17 01:35:06 +0000842 // Add the linker options metadata flag.
843 getModule().addModuleFlag(llvm::Module::AppendUnique, "Linker Options",
844 llvm::MDNode::get(getLLVMContext(), MetadataArgs));
Douglas Gregor858afb32013-01-14 20:53:57 +0000845}
846
Daniel Dunbar02698712009-02-13 20:29:50 +0000847void CodeGenModule::EmitDeferred() {
Chris Lattner67b00522009-03-21 09:44:56 +0000848 // Emit code for any potentially referenced deferred decls. Since a
849 // previously unused static decl may become used during the generation of code
Nick Lewyckydce67a72011-07-18 05:26:13 +0000850 // for a static function, iterate until no changes are made.
Rafael Espindolabbf58bb2010-03-10 02:19:29 +0000851
John McCalld5617ee2013-01-25 22:31:03 +0000852 while (true) {
Anders Carlsson046c2942010-04-17 20:15:18 +0000853 if (!DeferredVTables.empty()) {
John McCalld5617ee2013-01-25 22:31:03 +0000854 EmitDeferredVTables();
855
856 // Emitting a v-table doesn't directly cause more v-tables to
857 // become deferred, although it can cause functions to be
858 // emitted that then need those v-tables.
859 assert(DeferredVTables.empty());
Rafael Espindolabbf58bb2010-03-10 02:19:29 +0000860 }
861
John McCalld5617ee2013-01-25 22:31:03 +0000862 // Stop if we're out of both deferred v-tables and deferred declarations.
863 if (DeferredDeclsToEmit.empty()) break;
864
Anders Carlsson2a131fb2009-05-05 04:44:02 +0000865 GlobalDecl D = DeferredDeclsToEmit.back();
Chris Lattner67b00522009-03-21 09:44:56 +0000866 DeferredDeclsToEmit.pop_back();
867
John McCallc76702c2010-05-27 01:45:30 +0000868 // Check to see if we've already emitted this. This is necessary
869 // for a couple of reasons: first, decls can end up in the
870 // deferred-decls queue multiple times, and second, decls can end
871 // up with definitions in unusual ways (e.g. by an extern inline
872 // function acquiring a strong function redefinition). Just
873 // ignore these cases.
874 //
875 // TODO: That said, looking this up multiple times is very wasteful.
Chris Lattner5f9e2722011-07-23 10:55:15 +0000876 StringRef Name = getMangledName(D);
John McCallf746aa62010-03-19 23:29:14 +0000877 llvm::GlobalValue *CGRef = GetGlobalValue(Name);
Chris Lattner67b00522009-03-21 09:44:56 +0000878 assert(CGRef && "Deferred decl wasn't referenced?");
Mike Stump1eb44332009-09-09 15:08:12 +0000879
Chris Lattner67b00522009-03-21 09:44:56 +0000880 if (!CGRef->isDeclaration())
881 continue;
Mike Stump1eb44332009-09-09 15:08:12 +0000882
John McCallc76702c2010-05-27 01:45:30 +0000883 // GlobalAlias::isDeclaration() defers to the aliasee, but for our
884 // purposes an alias counts as a definition.
885 if (isa<llvm::GlobalAlias>(CGRef))
886 continue;
887
Chris Lattner67b00522009-03-21 09:44:56 +0000888 // Otherwise, emit the definition and move on to the next one.
889 EmitGlobalDefinition(D);
890 }
Reid Spencer5f016e22007-07-11 17:01:13 +0000891}
892
Julien Lerouge77f68bb2011-09-09 22:41:49 +0000893void CodeGenModule::EmitGlobalAnnotations() {
894 if (Annotations.empty())
895 return;
896
897 // Create a new global variable for the ConstantStruct in the Module.
898 llvm::Constant *Array = llvm::ConstantArray::get(llvm::ArrayType::get(
899 Annotations[0]->getType(), Annotations.size()), Annotations);
900 llvm::GlobalValue *gv = new llvm::GlobalVariable(getModule(),
901 Array->getType(), false, llvm::GlobalValue::AppendingLinkage, Array,
902 "llvm.global.annotations");
903 gv->setSection(AnnotationSection);
904}
905
Dmitri Gribenkocfa88f82013-01-12 19:30:44 +0000906llvm::Constant *CodeGenModule::EmitAnnotationString(StringRef Str) {
Julien Lerouge77f68bb2011-09-09 22:41:49 +0000907 llvm::StringMap<llvm::Constant*>::iterator i = AnnotationStrings.find(Str);
908 if (i != AnnotationStrings.end())
909 return i->second;
910
911 // Not found yet, create a new global.
Chris Lattner94010692012-02-05 02:30:40 +0000912 llvm::Constant *s = llvm::ConstantDataArray::getString(getLLVMContext(), Str);
Julien Lerouge77f68bb2011-09-09 22:41:49 +0000913 llvm::GlobalValue *gv = new llvm::GlobalVariable(getModule(), s->getType(),
914 true, llvm::GlobalValue::PrivateLinkage, s, ".str");
915 gv->setSection(AnnotationSection);
916 gv->setUnnamedAddr(true);
917 AnnotationStrings[Str] = gv;
918 return gv;
919}
920
921llvm::Constant *CodeGenModule::EmitAnnotationUnit(SourceLocation Loc) {
922 SourceManager &SM = getContext().getSourceManager();
923 PresumedLoc PLoc = SM.getPresumedLoc(Loc);
924 if (PLoc.isValid())
925 return EmitAnnotationString(PLoc.getFilename());
926 return EmitAnnotationString(SM.getBufferName(Loc));
927}
928
929llvm::Constant *CodeGenModule::EmitAnnotationLineNo(SourceLocation L) {
930 SourceManager &SM = getContext().getSourceManager();
931 PresumedLoc PLoc = SM.getPresumedLoc(L);
932 unsigned LineNo = PLoc.isValid() ? PLoc.getLine() :
933 SM.getExpansionLineNumber(L);
934 return llvm::ConstantInt::get(Int32Ty, LineNo);
935}
936
Mike Stump1eb44332009-09-09 15:08:12 +0000937llvm::Constant *CodeGenModule::EmitAnnotateAttr(llvm::GlobalValue *GV,
Nate Begeman8bd4afe2008-04-19 04:17:09 +0000938 const AnnotateAttr *AA,
Julien Lerouge77f68bb2011-09-09 22:41:49 +0000939 SourceLocation L) {
940 // Get the globals for file name, annotation, and the line number.
941 llvm::Constant *AnnoGV = EmitAnnotationString(AA->getAnnotation()),
942 *UnitGV = EmitAnnotationUnit(L),
943 *LineNoCst = EmitAnnotationLineNo(L);
Nate Begeman8bd4afe2008-04-19 04:17:09 +0000944
Daniel Dunbar57d5cee2009-04-14 22:41:13 +0000945 // Create the ConstantStruct for the global annotation.
Nate Begeman8bd4afe2008-04-19 04:17:09 +0000946 llvm::Constant *Fields[4] = {
Julien Lerouge77f68bb2011-09-09 22:41:49 +0000947 llvm::ConstantExpr::getBitCast(GV, Int8PtrTy),
948 llvm::ConstantExpr::getBitCast(AnnoGV, Int8PtrTy),
949 llvm::ConstantExpr::getBitCast(UnitGV, Int8PtrTy),
950 LineNoCst
Nate Begeman8bd4afe2008-04-19 04:17:09 +0000951 };
Chris Lattnerc5cbb902011-06-20 04:01:35 +0000952 return llvm::ConstantStruct::getAnon(Fields);
Nate Begeman8bd4afe2008-04-19 04:17:09 +0000953}
954
Julien Lerouge77f68bb2011-09-09 22:41:49 +0000955void CodeGenModule::AddGlobalAnnotations(const ValueDecl *D,
956 llvm::GlobalValue *GV) {
957 assert(D->hasAttr<AnnotateAttr>() && "no annotate attribute");
958 // Get the struct elements for these annotations.
959 for (specific_attr_iterator<AnnotateAttr>
960 ai = D->specific_attr_begin<AnnotateAttr>(),
961 ae = D->specific_attr_end<AnnotateAttr>(); ai != ae; ++ai)
962 Annotations.push_back(EmitAnnotateAttr(GV, *ai, D->getLocation()));
963}
964
Argyrios Kyrtzidisa6d6af32010-07-27 22:37:14 +0000965bool CodeGenModule::MayDeferGeneration(const ValueDecl *Global) {
Argyrios Kyrtzidis90e99a82010-07-29 18:15:58 +0000966 // Never defer when EmitAllDecls is specified.
David Blaikie4e4d0842012-03-11 07:00:24 +0000967 if (LangOpts.EmitAllDecls)
Daniel Dunbar73241df2009-02-13 21:18:01 +0000968 return false;
Daniel Dunbarbd012ff2008-07-29 23:18:29 +0000969
Argyrios Kyrtzidis4ac7c0b2010-07-29 20:08:05 +0000970 return !getContext().DeclMustBeEmitted(Global);
Daniel Dunbar73241df2009-02-13 21:18:01 +0000971}
972
Nico Weberc5f80462012-10-11 10:13:44 +0000973llvm::Constant *CodeGenModule::GetAddrOfUuidDescriptor(
974 const CXXUuidofExpr* E) {
975 // Sema has verified that IIDSource has a __declspec(uuid()), and that its
976 // well-formed.
977 StringRef Uuid;
978 if (E->isTypeOperand())
979 Uuid = CXXUuidofExpr::GetUuidAttrOfType(E->getTypeOperand())->getGuid();
980 else {
981 // Special case: __uuidof(0) means an all-zero GUID.
982 Expr *Op = E->getExprOperand();
983 if (!Op->isNullPointerConstant(Context, Expr::NPC_ValueDependentIsNull))
984 Uuid = CXXUuidofExpr::GetUuidAttrOfType(Op->getType())->getGuid();
985 else
986 Uuid = "00000000-0000-0000-0000-000000000000";
987 }
988 std::string Name = "__uuid_" + Uuid.str();
989
990 // Look for an existing global.
991 if (llvm::GlobalVariable *GV = getModule().getNamedGlobal(Name))
992 return GV;
993
994 llvm::Constant *Init = EmitUuidofInitializer(Uuid, E->getType());
995 assert(Init && "failed to initialize as constant");
996
997 // GUIDs are assumed to be 16 bytes, spread over 4-2-2-8 bytes. However, the
998 // first field is declared as "long", which for many targets is 8 bytes.
999 // Those architectures are not supported. (With the MS abi, long is always 4
1000 // bytes.)
1001 llvm::Type *GuidType = getTypes().ConvertType(E->getType());
1002 if (Init->getType() != GuidType) {
1003 DiagnosticsEngine &Diags = getDiags();
1004 unsigned DiagID = Diags.getCustomDiagID(DiagnosticsEngine::Error,
1005 "__uuidof codegen is not supported on this architecture");
1006 Diags.Report(E->getExprLoc(), DiagID) << E->getSourceRange();
1007 Init = llvm::UndefValue::get(GuidType);
1008 }
1009
1010 llvm::GlobalVariable *GV = new llvm::GlobalVariable(getModule(), GuidType,
1011 /*isConstant=*/true, llvm::GlobalValue::PrivateLinkage, Init, Name);
1012 GV->setUnnamedAddr(true);
1013 return GV;
1014}
1015
Rafael Espindola6a836702010-03-04 18:17:24 +00001016llvm::Constant *CodeGenModule::GetWeakRefReference(const ValueDecl *VD) {
1017 const AliasAttr *AA = VD->getAttr<AliasAttr>();
1018 assert(AA && "No alias?");
1019
Chris Lattner2acc6e32011-07-18 04:24:23 +00001020 llvm::Type *DeclTy = getTypes().ConvertTypeForMem(VD->getType());
Rafael Espindola6a836702010-03-04 18:17:24 +00001021
Rafael Espindola6a836702010-03-04 18:17:24 +00001022 // See if there is already something with the target's name in the module.
John McCallf746aa62010-03-19 23:29:14 +00001023 llvm::GlobalValue *Entry = GetGlobalValue(AA->getAliasee());
Joerg Sonnenberger4695f912012-10-16 17:45:27 +00001024 if (Entry) {
1025 unsigned AS = getContext().getTargetAddressSpace(VD->getType());
1026 return llvm::ConstantExpr::getBitCast(Entry, DeclTy->getPointerTo(AS));
1027 }
Rafael Espindola6a836702010-03-04 18:17:24 +00001028
1029 llvm::Constant *Aliasee;
1030 if (isa<llvm::FunctionType>(DeclTy))
Alex Rosenbergc857ce82012-10-05 23:12:53 +00001031 Aliasee = GetOrCreateLLVMFunction(AA->getAliasee(), DeclTy,
1032 GlobalDecl(cast<FunctionDecl>(VD)),
Anders Carlsson1faa89f2011-02-05 04:35:53 +00001033 /*ForVTable=*/false);
Rafael Espindola6a836702010-03-04 18:17:24 +00001034 else
John McCallf746aa62010-03-19 23:29:14 +00001035 Aliasee = GetOrCreateLLVMGlobal(AA->getAliasee(),
Rafael Espindola6a836702010-03-04 18:17:24 +00001036 llvm::PointerType::getUnqual(DeclTy), 0);
Joerg Sonnenberger4695f912012-10-16 17:45:27 +00001037
1038 llvm::GlobalValue* F = cast<llvm::GlobalValue>(Aliasee);
1039 F->setLinkage(llvm::Function::ExternalWeakLinkage);
1040 WeakRefReferences.insert(F);
Rafael Espindola6a836702010-03-04 18:17:24 +00001041
1042 return Aliasee;
1043}
1044
Chris Lattnerb4880ba2009-05-12 21:21:08 +00001045void CodeGenModule::EmitGlobal(GlobalDecl GD) {
Anders Carlsson4a6835e2009-09-10 23:38:47 +00001046 const ValueDecl *Global = cast<ValueDecl>(GD.getDecl());
Mike Stump1eb44332009-09-09 15:08:12 +00001047
Rafael Espindola6a836702010-03-04 18:17:24 +00001048 // Weak references don't produce any output by themselves.
1049 if (Global->hasAttr<WeakRefAttr>())
1050 return;
1051
Chris Lattnerbd532712009-03-22 21:47:11 +00001052 // If this is an alias definition (which otherwise looks like a declaration)
1053 // emit it now.
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +00001054 if (Global->hasAttr<AliasAttr>())
John McCallf746aa62010-03-19 23:29:14 +00001055 return EmitAliasDefinition(GD);
Daniel Dunbar219df662008-09-08 23:44:31 +00001056
Peter Collingbourned51e43a2011-10-06 18:29:46 +00001057 // If this is CUDA, be selective about which declarations we emit.
David Blaikie4e4d0842012-03-11 07:00:24 +00001058 if (LangOpts.CUDA) {
Peter Collingbourned51e43a2011-10-06 18:29:46 +00001059 if (CodeGenOpts.CUDAIsDevice) {
1060 if (!Global->hasAttr<CUDADeviceAttr>() &&
1061 !Global->hasAttr<CUDAGlobalAttr>() &&
1062 !Global->hasAttr<CUDAConstantAttr>() &&
1063 !Global->hasAttr<CUDASharedAttr>())
1064 return;
1065 } else {
1066 if (!Global->hasAttr<CUDAHostAttr>() && (
1067 Global->hasAttr<CUDADeviceAttr>() ||
1068 Global->hasAttr<CUDAConstantAttr>() ||
1069 Global->hasAttr<CUDASharedAttr>()))
1070 return;
1071 }
1072 }
1073
Chris Lattner67b00522009-03-21 09:44:56 +00001074 // Ignore declarations, they will be emitted on their first use.
Daniel Dunbar5e1e1f92009-03-19 08:27:24 +00001075 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(Global)) {
Daniel Dunbar73241df2009-02-13 21:18:01 +00001076 // Forward declarations are emitted lazily on first use.
Nick Lewyckydce67a72011-07-18 05:26:13 +00001077 if (!FD->doesThisDeclarationHaveABody()) {
1078 if (!FD->doesDeclarationForceExternallyVisibleDefinition())
1079 return;
1080
1081 const FunctionDecl *InlineDefinition = 0;
1082 FD->getBody(InlineDefinition);
1083
Chris Lattner5f9e2722011-07-23 10:55:15 +00001084 StringRef MangledName = getMangledName(GD);
Benjamin Kramer7e423922012-03-24 18:22:12 +00001085 DeferredDecls.erase(MangledName);
Nick Lewyckydce67a72011-07-18 05:26:13 +00001086 EmitGlobalDefinition(InlineDefinition);
Daniel Dunbar73241df2009-02-13 21:18:01 +00001087 return;
Nick Lewyckydce67a72011-07-18 05:26:13 +00001088 }
Daniel Dunbar02698712009-02-13 20:29:50 +00001089 } else {
1090 const VarDecl *VD = cast<VarDecl>(Global);
Daniel Dunbarbd012ff2008-07-29 23:18:29 +00001091 assert(VD->isFileVarDecl() && "Cannot emit local var decl as global.");
1092
Douglas Gregora9a55c02010-02-06 05:15:45 +00001093 if (VD->isThisDeclarationADefinition() != VarDecl::Definition)
Douglas Gregorb6c8c8b2009-04-21 17:11:58 +00001094 return;
Nate Begeman4c13b7a2008-04-20 06:29:50 +00001095 }
1096
Chris Lattner67b00522009-03-21 09:44:56 +00001097 // Defer code generation when possible if this is a static definition, inline
1098 // function etc. These we only want to emit if they are used.
Chris Lattner4357a822010-04-13 17:39:09 +00001099 if (!MayDeferGeneration(Global)) {
1100 // Emit the definition if it can't be deferred.
1101 EmitGlobalDefinition(GD);
Daniel Dunbarbd012ff2008-07-29 23:18:29 +00001102 return;
1103 }
John McCallbf40cb52010-07-15 23:40:35 +00001104
1105 // If we're deferring emission of a C++ variable with an
1106 // initializer, remember the order in which it appeared in the file.
David Blaikie4e4d0842012-03-11 07:00:24 +00001107 if (getLangOpts().CPlusPlus && isa<VarDecl>(Global) &&
John McCallbf40cb52010-07-15 23:40:35 +00001108 cast<VarDecl>(Global)->hasInit()) {
1109 DelayedCXXInitPosition[Global] = CXXGlobalInits.size();
1110 CXXGlobalInits.push_back(0);
1111 }
Chris Lattner4357a822010-04-13 17:39:09 +00001112
1113 // If the value has already been used, add it directly to the
1114 // DeferredDeclsToEmit list.
Chris Lattner5f9e2722011-07-23 10:55:15 +00001115 StringRef MangledName = getMangledName(GD);
Chris Lattner4357a822010-04-13 17:39:09 +00001116 if (GetGlobalValue(MangledName))
1117 DeferredDeclsToEmit.push_back(GD);
1118 else {
1119 // Otherwise, remember that we saw a deferred decl with this name. The
1120 // first use of the mangled name will cause it to move into
1121 // DeferredDeclsToEmit.
1122 DeferredDecls[MangledName] = GD;
1123 }
Nate Begeman4c13b7a2008-04-20 06:29:50 +00001124}
1125
Rafael Espindolaa411d2f2011-10-26 20:41:06 +00001126namespace {
1127 struct FunctionIsDirectlyRecursive :
1128 public RecursiveASTVisitor<FunctionIsDirectlyRecursive> {
1129 const StringRef Name;
Rafael Espindolabcf6b982011-12-19 14:41:01 +00001130 const Builtin::Context &BI;
Rafael Espindolaa411d2f2011-10-26 20:41:06 +00001131 bool Result;
Rafael Espindolabcf6b982011-12-19 14:41:01 +00001132 FunctionIsDirectlyRecursive(StringRef N, const Builtin::Context &C) :
1133 Name(N), BI(C), Result(false) {
Rafael Espindolaa411d2f2011-10-26 20:41:06 +00001134 }
1135 typedef RecursiveASTVisitor<FunctionIsDirectlyRecursive> Base;
1136
1137 bool TraverseCallExpr(CallExpr *E) {
Rafael Espindolabcf6b982011-12-19 14:41:01 +00001138 const FunctionDecl *FD = E->getDirectCallee();
1139 if (!FD)
Rafael Espindolaa411d2f2011-10-26 20:41:06 +00001140 return true;
Rafael Espindolabcf6b982011-12-19 14:41:01 +00001141 AsmLabelAttr *Attr = FD->getAttr<AsmLabelAttr>();
1142 if (Attr && Name == Attr->getLabel()) {
1143 Result = true;
1144 return false;
1145 }
1146 unsigned BuiltinID = FD->getBuiltinID();
1147 if (!BuiltinID)
Rafael Espindolaa411d2f2011-10-26 20:41:06 +00001148 return true;
Nick Lewyckyf6b56372012-01-18 03:41:19 +00001149 StringRef BuiltinName = BI.GetName(BuiltinID);
1150 if (BuiltinName.startswith("__builtin_") &&
1151 Name == BuiltinName.slice(strlen("__builtin_"), StringRef::npos)) {
Rafael Espindolaa411d2f2011-10-26 20:41:06 +00001152 Result = true;
1153 return false;
1154 }
1155 return true;
1156 }
1157 };
1158}
1159
Rafael Espindolabcf6b982011-12-19 14:41:01 +00001160// isTriviallyRecursive - Check if this function calls another
1161// decl that, because of the asm attribute or the other decl being a builtin,
1162// ends up pointing to itself.
Rafael Espindolaa411d2f2011-10-26 20:41:06 +00001163bool
Rafael Espindolabcf6b982011-12-19 14:41:01 +00001164CodeGenModule::isTriviallyRecursive(const FunctionDecl *FD) {
1165 StringRef Name;
1166 if (getCXXABI().getMangleContext().shouldMangleDeclName(FD)) {
Nick Lewycky22afacc2012-01-18 01:50:13 +00001167 // asm labels are a special kind of mangling we have to support.
Rafael Espindolabcf6b982011-12-19 14:41:01 +00001168 AsmLabelAttr *Attr = FD->getAttr<AsmLabelAttr>();
1169 if (!Attr)
1170 return false;
1171 Name = Attr->getLabel();
1172 } else {
1173 Name = FD->getName();
1174 }
Rafael Espindolaa411d2f2011-10-26 20:41:06 +00001175
Rafael Espindolabcf6b982011-12-19 14:41:01 +00001176 FunctionIsDirectlyRecursive Walker(Name, Context.BuiltinInfo);
1177 Walker.TraverseFunctionDecl(const_cast<FunctionDecl*>(FD));
Rafael Espindolaa411d2f2011-10-26 20:41:06 +00001178 return Walker.Result;
1179}
1180
1181bool
1182CodeGenModule::shouldEmitFunction(const FunctionDecl *F) {
1183 if (getFunctionLinkage(F) != llvm::Function::AvailableExternallyLinkage)
1184 return true;
Rafael Espindolacc4889f2011-10-28 20:43:56 +00001185 if (CodeGenOpts.OptimizationLevel == 0 &&
Michael J. Spenceradc6cbf2012-06-18 07:00:48 +00001186 !F->hasAttr<AlwaysInlineAttr>() && !F->hasAttr<ForceInlineAttr>())
Rafael Espindolaa411d2f2011-10-26 20:41:06 +00001187 return false;
1188 // PR9614. Avoid cases where the source code is lying to us. An available
1189 // externally function should have an equivalent function somewhere else,
1190 // but a function that calls itself is clearly not equivalent to the real
1191 // implementation.
1192 // This happens in glibc's btowc and in some configure checks.
Rafael Espindolabcf6b982011-12-19 14:41:01 +00001193 return !isTriviallyRecursive(F);
Rafael Espindolaa411d2f2011-10-26 20:41:06 +00001194}
1195
Chris Lattnerb4880ba2009-05-12 21:21:08 +00001196void CodeGenModule::EmitGlobalDefinition(GlobalDecl GD) {
Anders Carlsson4a6835e2009-09-10 23:38:47 +00001197 const ValueDecl *D = cast<ValueDecl>(GD.getDecl());
Mike Stump1eb44332009-09-09 15:08:12 +00001198
Dan Gohmancb421fa2010-04-19 16:39:44 +00001199 PrettyStackTraceDecl CrashInfo(const_cast<ValueDecl *>(D), D->getLocation(),
Anders Carlsson8e2efcc2009-10-27 14:32:27 +00001200 Context.getSourceManager(),
1201 "Generating code for declaration");
1202
Douglas Gregor44eac332010-07-13 06:02:28 +00001203 if (const FunctionDecl *Function = dyn_cast<FunctionDecl>(D)) {
1204 // At -O0, don't generate IR for functions with available_externally
1205 // linkage.
Rafael Espindolaa411d2f2011-10-26 20:41:06 +00001206 if (!shouldEmitFunction(Function))
Douglas Gregor44eac332010-07-13 06:02:28 +00001207 return;
Anders Carlsson7270ee42010-03-23 04:31:31 +00001208
Douglas Gregor44eac332010-07-13 06:02:28 +00001209 if (const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) {
Eli Friedman7dcdf5b2011-05-06 17:27:27 +00001210 // Make sure to emit the definition(s) before we emit the thunks.
1211 // This is necessary for the generation of certain thunks.
1212 if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(Method))
1213 EmitCXXConstructor(CD, GD.getCtorType());
1214 else if (const CXXDestructorDecl *DD =dyn_cast<CXXDestructorDecl>(Method))
1215 EmitCXXDestructor(DD, GD.getDtorType());
1216 else
1217 EmitGlobalFunctionDefinition(GD);
1218
Douglas Gregor44eac332010-07-13 06:02:28 +00001219 if (Method->isVirtual())
1220 getVTables().EmitThunks(GD);
1221
Eli Friedman7dcdf5b2011-05-06 17:27:27 +00001222 return;
Douglas Gregor44eac332010-07-13 06:02:28 +00001223 }
Chris Lattnerb5e81562010-04-13 17:57:11 +00001224
Chris Lattnerb5e81562010-04-13 17:57:11 +00001225 return EmitGlobalFunctionDefinition(GD);
Douglas Gregor44eac332010-07-13 06:02:28 +00001226 }
Chris Lattnerb5e81562010-04-13 17:57:11 +00001227
1228 if (const VarDecl *VD = dyn_cast<VarDecl>(D))
1229 return EmitGlobalVarDefinition(VD);
Chris Lattner4357a822010-04-13 17:39:09 +00001230
David Blaikieb219cfc2011-09-23 05:06:16 +00001231 llvm_unreachable("Invalid argument to EmitGlobalDefinition()");
Daniel Dunbarbd012ff2008-07-29 23:18:29 +00001232}
1233
Chris Lattner74391b42009-03-22 21:03:39 +00001234/// GetOrCreateLLVMFunction - If the specified mangled name is not in the
1235/// module, create and return an llvm Function with the specified type. If there
1236/// is something in the module with the specified name, return it potentially
1237/// bitcasted to the right type.
1238///
1239/// If D is non-null, it specifies a decl that correspond to this. This is used
1240/// to set the attributes on the function when it is first created.
John McCallf746aa62010-03-19 23:29:14 +00001241llvm::Constant *
Chris Lattner5f9e2722011-07-23 10:55:15 +00001242CodeGenModule::GetOrCreateLLVMFunction(StringRef MangledName,
Chris Lattner2acc6e32011-07-18 04:24:23 +00001243 llvm::Type *Ty,
John McCallf85e1932011-06-15 23:02:42 +00001244 GlobalDecl D, bool ForVTable,
Bill Wendlingc4c62fd2013-01-31 00:30:05 +00001245 llvm::AttributeSet ExtraAttrs) {
Chris Lattner0558e792009-03-21 09:25:43 +00001246 // Lookup the entry, lazily creating it if necessary.
John McCallf746aa62010-03-19 23:29:14 +00001247 llvm::GlobalValue *Entry = GetGlobalValue(MangledName);
Chris Lattner0558e792009-03-21 09:25:43 +00001248 if (Entry) {
Benjamin Kramerd48bcb22012-08-22 15:37:55 +00001249 if (WeakRefReferences.erase(Entry)) {
Rafael Espindola6a836702010-03-04 18:17:24 +00001250 const FunctionDecl *FD = cast_or_null<FunctionDecl>(D.getDecl());
1251 if (FD && !FD->hasAttr<WeakAttr>())
Anders Carlsson7270ee42010-03-23 04:31:31 +00001252 Entry->setLinkage(llvm::Function::ExternalLinkage);
Rafael Espindola6a836702010-03-04 18:17:24 +00001253 }
1254
Chris Lattner0558e792009-03-21 09:25:43 +00001255 if (Entry->getType()->getElementType() == Ty)
1256 return Entry;
Mike Stump1eb44332009-09-09 15:08:12 +00001257
Chris Lattner0558e792009-03-21 09:25:43 +00001258 // Make sure the result is of the correct type.
Chris Lattner9cbe4f02011-07-09 17:41:47 +00001259 return llvm::ConstantExpr::getBitCast(Entry, Ty->getPointerTo());
Chris Lattner0558e792009-03-21 09:25:43 +00001260 }
Mike Stump1eb44332009-09-09 15:08:12 +00001261
Eli Friedman654ad402009-11-09 05:07:37 +00001262 // This function doesn't have a complete type (for example, the return
1263 // type is an incomplete struct). Use a fake type instead, and make
1264 // sure not to try to set attributes.
1265 bool IsIncompleteFunction = false;
John McCall784f2112010-04-28 00:00:30 +00001266
Chris Lattner2acc6e32011-07-18 04:24:23 +00001267 llvm::FunctionType *FTy;
John McCall784f2112010-04-28 00:00:30 +00001268 if (isa<llvm::FunctionType>(Ty)) {
1269 FTy = cast<llvm::FunctionType>(Ty);
1270 } else {
John McCall0774cb82011-05-15 01:53:33 +00001271 FTy = llvm::FunctionType::get(VoidTy, false);
Eli Friedman654ad402009-11-09 05:07:37 +00001272 IsIncompleteFunction = true;
1273 }
Chris Lattnerbcaedae2010-06-30 19:14:05 +00001274
John McCall784f2112010-04-28 00:00:30 +00001275 llvm::Function *F = llvm::Function::Create(FTy,
Eli Friedman654ad402009-11-09 05:07:37 +00001276 llvm::Function::ExternalLinkage,
John McCallf746aa62010-03-19 23:29:14 +00001277 MangledName, &getModule());
1278 assert(F->getName() == MangledName && "name was uniqued!");
Eli Friedman654ad402009-11-09 05:07:37 +00001279 if (D.getDecl())
Anders Carlssonb2bcf1c2010-02-06 02:44:09 +00001280 SetFunctionAttributes(D, F, IsIncompleteFunction);
Bill Wendlingc4c62fd2013-01-31 00:30:05 +00001281 if (ExtraAttrs.hasAttributes(llvm::AttributeSet::FunctionIndex)) {
1282 llvm::AttrBuilder B(ExtraAttrs, llvm::AttributeSet::FunctionIndex);
Bill Wendling909b6de2013-01-23 00:21:06 +00001283 F->addAttributes(llvm::AttributeSet::FunctionIndex,
1284 llvm::AttributeSet::get(VMContext,
1285 llvm::AttributeSet::FunctionIndex,
1286 B));
1287 }
Eli Friedman654ad402009-11-09 05:07:37 +00001288
Chris Lattner67b00522009-03-21 09:44:56 +00001289 // This is the first use or definition of a mangled name. If there is a
1290 // deferred decl with this name, remember that we need to emit it at the end
1291 // of the file.
John McCallf746aa62010-03-19 23:29:14 +00001292 llvm::StringMap<GlobalDecl>::iterator DDI = DeferredDecls.find(MangledName);
Chris Lattner67b00522009-03-21 09:44:56 +00001293 if (DDI != DeferredDecls.end()) {
1294 // Move the potentially referenced deferred decl to the DeferredDeclsToEmit
1295 // list, and remove it from DeferredDecls (since we don't need it anymore).
1296 DeferredDeclsToEmit.push_back(DDI->second);
1297 DeferredDecls.erase(DDI);
John McCallbfdcdc82010-12-15 04:00:32 +00001298
1299 // Otherwise, there are cases we have to worry about where we're
1300 // using a declaration for which we must emit a definition but where
1301 // we might not find a top-level definition:
1302 // - member functions defined inline in their classes
1303 // - friend functions defined inline in some class
1304 // - special member functions with implicit definitions
1305 // If we ever change our AST traversal to walk into class methods,
1306 // this will be unnecessary.
Anders Carlsson1faa89f2011-02-05 04:35:53 +00001307 //
1308 // We also don't emit a definition for a function if it's going to be an entry
1309 // in a vtable, unless it's already marked as used.
David Blaikie4e4d0842012-03-11 07:00:24 +00001310 } else if (getLangOpts().CPlusPlus && D.getDecl()) {
John McCallbfdcdc82010-12-15 04:00:32 +00001311 // Look for a declaration that's lexically in a record.
1312 const FunctionDecl *FD = cast<FunctionDecl>(D.getDecl());
Eli Friedmanb135f0f2012-07-02 21:05:30 +00001313 FD = FD->getMostRecentDecl();
John McCallbfdcdc82010-12-15 04:00:32 +00001314 do {
1315 if (isa<CXXRecordDecl>(FD->getLexicalDeclContext())) {
Anders Carlsson1faa89f2011-02-05 04:35:53 +00001316 if (FD->isImplicit() && !ForVTable) {
John McCallbfdcdc82010-12-15 04:00:32 +00001317 assert(FD->isUsed() && "Sema didn't mark implicit function as used!");
Douglas Gregora29bf412011-02-09 02:03:05 +00001318 DeferredDeclsToEmit.push_back(D.getWithDecl(FD));
John McCallbfdcdc82010-12-15 04:00:32 +00001319 break;
Sean Hunt10620eb2011-05-06 20:44:56 +00001320 } else if (FD->doesThisDeclarationHaveABody()) {
Douglas Gregora29bf412011-02-09 02:03:05 +00001321 DeferredDeclsToEmit.push_back(D.getWithDecl(FD));
John McCallbfdcdc82010-12-15 04:00:32 +00001322 break;
1323 }
Rafael Espindola7b9a5aa2010-03-02 21:28:26 +00001324 }
Douglas Gregoref96ee02012-01-14 16:38:05 +00001325 FD = FD->getPreviousDecl();
John McCallbfdcdc82010-12-15 04:00:32 +00001326 } while (FD);
Chris Lattner67b00522009-03-21 09:44:56 +00001327 }
Mike Stump1eb44332009-09-09 15:08:12 +00001328
John McCall784f2112010-04-28 00:00:30 +00001329 // Make sure the result is of the requested type.
1330 if (!IsIncompleteFunction) {
1331 assert(F->getType()->getElementType() == Ty);
1332 return F;
1333 }
1334
Chris Lattner9cbe4f02011-07-09 17:41:47 +00001335 llvm::Type *PTy = llvm::PointerType::getUnqual(Ty);
John McCall784f2112010-04-28 00:00:30 +00001336 return llvm::ConstantExpr::getBitCast(F, PTy);
Chris Lattner0558e792009-03-21 09:25:43 +00001337}
1338
Chris Lattner74391b42009-03-22 21:03:39 +00001339/// GetAddrOfFunction - Return the address of the given function. If Ty is
1340/// non-null, then this function will use the specified type if it has to
1341/// create it (this occurs when we see a definition of the function).
Chris Lattnerb4880ba2009-05-12 21:21:08 +00001342llvm::Constant *CodeGenModule::GetAddrOfFunction(GlobalDecl GD,
Chris Lattner2acc6e32011-07-18 04:24:23 +00001343 llvm::Type *Ty,
Anders Carlsson1faa89f2011-02-05 04:35:53 +00001344 bool ForVTable) {
Chris Lattner74391b42009-03-22 21:03:39 +00001345 // If there was no specific requested type, just convert it now.
1346 if (!Ty)
Anders Carlsson4a6835e2009-09-10 23:38:47 +00001347 Ty = getTypes().ConvertType(cast<ValueDecl>(GD.getDecl())->getType());
Chris Lattnerbcaedae2010-06-30 19:14:05 +00001348
Chris Lattner5f9e2722011-07-23 10:55:15 +00001349 StringRef MangledName = getMangledName(GD);
Anders Carlsson1faa89f2011-02-05 04:35:53 +00001350 return GetOrCreateLLVMFunction(MangledName, Ty, GD, ForVTable);
Chris Lattner74391b42009-03-22 21:03:39 +00001351}
Eli Friedman77ba7082008-05-30 19:50:47 +00001352
Chris Lattner74391b42009-03-22 21:03:39 +00001353/// CreateRuntimeFunction - Create a new runtime function with the specified
1354/// type and name.
1355llvm::Constant *
Chris Lattner2acc6e32011-07-18 04:24:23 +00001356CodeGenModule::CreateRuntimeFunction(llvm::FunctionType *FTy,
Chris Lattner5f9e2722011-07-23 10:55:15 +00001357 StringRef Name,
Bill Wendlingc4c62fd2013-01-31 00:30:05 +00001358 llvm::AttributeSet ExtraAttrs) {
John McCallbd7370a2013-02-28 19:01:20 +00001359 llvm::Constant *C
1360 = GetOrCreateLLVMFunction(Name, FTy, GlobalDecl(), /*ForVTable=*/false,
1361 ExtraAttrs);
1362 if (llvm::Function *F = dyn_cast<llvm::Function>(C))
1363 if (F->empty())
1364 F->setCallingConv(getRuntimeCC());
1365 return C;
Chris Lattner74391b42009-03-22 21:03:39 +00001366}
Daniel Dunbarbd012ff2008-07-29 23:18:29 +00001367
Richard Smitha9b21d22012-02-17 06:48:11 +00001368/// isTypeConstant - Determine whether an object of this type can be emitted
1369/// as a constant.
1370///
1371/// If ExcludeCtor is true, the duration when the object's constructor runs
1372/// will not be considered. The caller will need to verify that the object is
1373/// not written to during its construction.
1374bool CodeGenModule::isTypeConstant(QualType Ty, bool ExcludeCtor) {
1375 if (!Ty.isConstant(Context) && !Ty->isReferenceType())
Eli Friedman20e098b2009-12-11 21:23:03 +00001376 return false;
Richard Smitha9b21d22012-02-17 06:48:11 +00001377
David Blaikie4e4d0842012-03-11 07:00:24 +00001378 if (Context.getLangOpts().CPlusPlus) {
Richard Smitha9b21d22012-02-17 06:48:11 +00001379 if (const CXXRecordDecl *Record
1380 = Context.getBaseElementType(Ty)->getAsCXXRecordDecl())
1381 return ExcludeCtor && !Record->hasMutableFields() &&
1382 Record->hasTrivialDestructor();
Eli Friedman20e098b2009-12-11 21:23:03 +00001383 }
Richard Smitha9b21d22012-02-17 06:48:11 +00001384
Eli Friedman20e098b2009-12-11 21:23:03 +00001385 return true;
1386}
1387
Chris Lattner74391b42009-03-22 21:03:39 +00001388/// GetOrCreateLLVMGlobal - If the specified mangled name is not in the module,
1389/// create and return an llvm GlobalVariable with the specified type. If there
1390/// is something in the module with the specified name, return it potentially
1391/// bitcasted to the right type.
1392///
1393/// If D is non-null, it specifies a decl that correspond to this. This is used
1394/// to set the attributes on the global when it is first created.
John McCallf746aa62010-03-19 23:29:14 +00001395llvm::Constant *
Chris Lattner5f9e2722011-07-23 10:55:15 +00001396CodeGenModule::GetOrCreateLLVMGlobal(StringRef MangledName,
Chris Lattner2acc6e32011-07-18 04:24:23 +00001397 llvm::PointerType *Ty,
Rafael Espindolac532b502011-01-18 21:07:57 +00001398 const VarDecl *D,
1399 bool UnnamedAddr) {
Daniel Dunbar3c827a72008-08-05 23:31:02 +00001400 // Lookup the entry, lazily creating it if necessary.
John McCallf746aa62010-03-19 23:29:14 +00001401 llvm::GlobalValue *Entry = GetGlobalValue(MangledName);
Chris Lattner99b53612009-03-21 08:03:33 +00001402 if (Entry) {
Benjamin Kramerd48bcb22012-08-22 15:37:55 +00001403 if (WeakRefReferences.erase(Entry)) {
Rafael Espindola6a836702010-03-04 18:17:24 +00001404 if (D && !D->hasAttr<WeakAttr>())
Anders Carlsson7270ee42010-03-23 04:31:31 +00001405 Entry->setLinkage(llvm::Function::ExternalLinkage);
Rafael Espindola6a836702010-03-04 18:17:24 +00001406 }
1407
Rafael Espindolac532b502011-01-18 21:07:57 +00001408 if (UnnamedAddr)
1409 Entry->setUnnamedAddr(true);
1410
Chris Lattner74391b42009-03-22 21:03:39 +00001411 if (Entry->getType() == Ty)
Chris Lattner570585c2009-03-21 09:16:30 +00001412 return Entry;
Mike Stump1eb44332009-09-09 15:08:12 +00001413
Chris Lattner99b53612009-03-21 08:03:33 +00001414 // Make sure the result is of the correct type.
Owen Anderson3c4972d2009-07-29 18:54:39 +00001415 return llvm::ConstantExpr::getBitCast(Entry, Ty);
Daniel Dunbar49988882009-01-13 02:25:00 +00001416 }
Mike Stump1eb44332009-09-09 15:08:12 +00001417
Chris Lattner67b00522009-03-21 09:44:56 +00001418 // This is the first use or definition of a mangled name. If there is a
1419 // deferred decl with this name, remember that we need to emit it at the end
1420 // of the file.
John McCallf746aa62010-03-19 23:29:14 +00001421 llvm::StringMap<GlobalDecl>::iterator DDI = DeferredDecls.find(MangledName);
Chris Lattner67b00522009-03-21 09:44:56 +00001422 if (DDI != DeferredDecls.end()) {
1423 // Move the potentially referenced deferred decl to the DeferredDeclsToEmit
1424 // list, and remove it from DeferredDecls (since we don't need it anymore).
1425 DeferredDeclsToEmit.push_back(DDI->second);
1426 DeferredDecls.erase(DDI);
1427 }
Mike Stump1eb44332009-09-09 15:08:12 +00001428
Peter Collingbourne4dc34eb2012-05-20 21:08:35 +00001429 unsigned AddrSpace = GetGlobalVarAddressSpace(D, Ty->getAddressSpace());
Mike Stump1eb44332009-09-09 15:08:12 +00001430 llvm::GlobalVariable *GV =
1431 new llvm::GlobalVariable(getModule(), Ty->getElementType(), false,
Chris Lattner99b53612009-03-21 08:03:33 +00001432 llvm::GlobalValue::ExternalLinkage,
John McCallf746aa62010-03-19 23:29:14 +00001433 0, MangledName, 0,
Hans Wennborg5e2d5de2012-06-23 11:51:46 +00001434 llvm::GlobalVariable::NotThreadLocal, AddrSpace);
Chris Lattner99b53612009-03-21 08:03:33 +00001435
1436 // Handle things which are present even on external declarations.
Chris Lattner74391b42009-03-22 21:03:39 +00001437 if (D) {
Mike Stumpf5408fe2009-05-16 07:57:57 +00001438 // FIXME: This code is overly simple and should be merged with other global
1439 // handling.
Richard Smitha9b21d22012-02-17 06:48:11 +00001440 GV->setConstant(isTypeConstant(D->getType(), false));
Chris Lattner99b53612009-03-21 08:03:33 +00001441
John McCall110e8e52010-10-29 22:22:43 +00001442 // Set linkage and visibility in case we never see a definition.
Rafael Espindola2beda122013-02-27 02:15:29 +00001443 LinkageInfo LV = D->getLinkageAndVisibility();
Rafael Espindolaf127eb82013-02-27 02:56:45 +00001444 if (LV.getLinkage() != ExternalLinkage) {
John McCall15e310a2011-02-19 02:53:41 +00001445 // Don't set internal linkage on declarations.
John McCall110e8e52010-10-29 22:22:43 +00001446 } else {
1447 if (D->hasAttr<DLLImportAttr>())
1448 GV->setLinkage(llvm::GlobalValue::DLLImportLinkage);
Douglas Gregor0a0d2b12011-03-23 00:50:03 +00001449 else if (D->hasAttr<WeakAttr>() || D->isWeakImported())
John McCall110e8e52010-10-29 22:22:43 +00001450 GV->setLinkage(llvm::GlobalValue::ExternalWeakLinkage);
Chris Lattner99b53612009-03-21 08:03:33 +00001451
John McCallaf146032010-10-30 11:50:40 +00001452 // Set visibility on a declaration only if it's explicit.
Rafael Espindolaf127eb82013-02-27 02:56:45 +00001453 if (LV.isVisibilityExplicit())
1454 GV->setVisibility(GetLLVMVisibility(LV.getVisibility()));
John McCall110e8e52010-10-29 22:22:43 +00001455 }
Eli Friedman56ebe502009-04-19 21:05:03 +00001456
Hans Wennborgde981f32012-06-28 08:01:44 +00001457 if (D->isThreadSpecified())
1458 setTLSMode(GV, *D);
Chris Lattner74391b42009-03-22 21:03:39 +00001459 }
Mike Stump1eb44332009-09-09 15:08:12 +00001460
Peter Collingbourne4dc34eb2012-05-20 21:08:35 +00001461 if (AddrSpace != Ty->getAddressSpace())
1462 return llvm::ConstantExpr::getBitCast(GV, Ty);
1463 else
1464 return GV;
Daniel Dunbarbd012ff2008-07-29 23:18:29 +00001465}
1466
Chris Lattner74391b42009-03-22 21:03:39 +00001467
Anders Carlsson3bd62022011-01-29 18:20:20 +00001468llvm::GlobalVariable *
Chris Lattner5f9e2722011-07-23 10:55:15 +00001469CodeGenModule::CreateOrReplaceCXXRuntimeVariable(StringRef Name,
Chris Lattner2acc6e32011-07-18 04:24:23 +00001470 llvm::Type *Ty,
Anders Carlsson3bd62022011-01-29 18:20:20 +00001471 llvm::GlobalValue::LinkageTypes Linkage) {
1472 llvm::GlobalVariable *GV = getModule().getNamedGlobal(Name);
1473 llvm::GlobalVariable *OldGV = 0;
1474
1475
1476 if (GV) {
1477 // Check if the variable has the right type.
1478 if (GV->getType()->getElementType() == Ty)
1479 return GV;
1480
1481 // Because C++ name mangling, the only way we can end up with an already
1482 // existing global with the same name is if it has been declared extern "C".
Nico Weberc5f80462012-10-11 10:13:44 +00001483 assert(GV->isDeclaration() && "Declaration has wrong type!");
Anders Carlsson3bd62022011-01-29 18:20:20 +00001484 OldGV = GV;
1485 }
1486
1487 // Create a new variable.
1488 GV = new llvm::GlobalVariable(getModule(), Ty, /*isConstant=*/true,
1489 Linkage, 0, Name);
1490
1491 if (OldGV) {
1492 // Replace occurrences of the old variable if needed.
1493 GV->takeName(OldGV);
1494
1495 if (!OldGV->use_empty()) {
1496 llvm::Constant *NewPtrForOldDecl =
1497 llvm::ConstantExpr::getBitCast(GV, OldGV->getType());
1498 OldGV->replaceAllUsesWith(NewPtrForOldDecl);
1499 }
1500
1501 OldGV->eraseFromParent();
1502 }
1503
1504 return GV;
1505}
1506
Chris Lattner74391b42009-03-22 21:03:39 +00001507/// GetAddrOfGlobalVar - Return the llvm::Constant for the address of the
1508/// given global variable. If Ty is non-null and if the global doesn't exist,
Eric Christopher0ff258b2012-04-16 23:55:04 +00001509/// then it will be created with the specified type instead of whatever the
Chris Lattner74391b42009-03-22 21:03:39 +00001510/// normal requested type would be.
1511llvm::Constant *CodeGenModule::GetAddrOfGlobalVar(const VarDecl *D,
Chris Lattner2acc6e32011-07-18 04:24:23 +00001512 llvm::Type *Ty) {
Chris Lattner74391b42009-03-22 21:03:39 +00001513 assert(D->hasGlobalStorage() && "Not a global variable");
1514 QualType ASTTy = D->getType();
1515 if (Ty == 0)
1516 Ty = getTypes().ConvertTypeForMem(ASTTy);
Mike Stump1eb44332009-09-09 15:08:12 +00001517
Chris Lattner2acc6e32011-07-18 04:24:23 +00001518 llvm::PointerType *PTy =
Peter Collingbourne207f4d82011-03-18 22:38:29 +00001519 llvm::PointerType::get(Ty, getContext().getTargetAddressSpace(ASTTy));
John McCallf746aa62010-03-19 23:29:14 +00001520
Chris Lattner5f9e2722011-07-23 10:55:15 +00001521 StringRef MangledName = getMangledName(D);
John McCallf746aa62010-03-19 23:29:14 +00001522 return GetOrCreateLLVMGlobal(MangledName, PTy, D);
Chris Lattner74391b42009-03-22 21:03:39 +00001523}
1524
1525/// CreateRuntimeVariable - Create a new runtime global variable with the
1526/// specified type and name.
1527llvm::Constant *
Chris Lattner2acc6e32011-07-18 04:24:23 +00001528CodeGenModule::CreateRuntimeVariable(llvm::Type *Ty,
Chris Lattner5f9e2722011-07-23 10:55:15 +00001529 StringRef Name) {
John McCall1de4d4e2011-04-07 08:22:57 +00001530 return GetOrCreateLLVMGlobal(Name, llvm::PointerType::getUnqual(Ty), 0,
Rafael Espindolac532b502011-01-18 21:07:57 +00001531 true);
Chris Lattner74391b42009-03-22 21:03:39 +00001532}
1533
Daniel Dunbar03f5ad92009-04-15 22:08:45 +00001534void CodeGenModule::EmitTentativeDefinition(const VarDecl *D) {
1535 assert(!D->getInit() && "Cannot emit definite definitions here!");
1536
Douglas Gregor7520bd12009-04-21 19:28:58 +00001537 if (MayDeferGeneration(D)) {
1538 // If we have not seen a reference to this variable yet, place it
1539 // into the deferred declarations table to be emitted if needed
1540 // later.
Chris Lattner5f9e2722011-07-23 10:55:15 +00001541 StringRef MangledName = getMangledName(D);
John McCallf746aa62010-03-19 23:29:14 +00001542 if (!GetGlobalValue(MangledName)) {
Anders Carlsson555b4bb2009-09-10 23:43:36 +00001543 DeferredDecls[MangledName] = D;
Daniel Dunbar03f5ad92009-04-15 22:08:45 +00001544 return;
Douglas Gregor7520bd12009-04-21 19:28:58 +00001545 }
1546 }
1547
1548 // The tentative definition is the only definition.
Daniel Dunbar03f5ad92009-04-15 22:08:45 +00001549 EmitGlobalVarDefinition(D);
1550}
1551
Chris Lattner2acc6e32011-07-18 04:24:23 +00001552CharUnits CodeGenModule::GetTargetTypeStoreSize(llvm::Type *Ty) const {
Ken Dyck06f486e2011-01-18 02:01:14 +00001553 return Context.toCharUnitsFromBits(
Micah Villmow25a6a842012-10-08 16:25:52 +00001554 TheDataLayout.getTypeStoreSizeInBits(Ty));
Ken Dyck687cc4a2010-01-26 13:48:07 +00001555}
1556
Sebastian Redl19b1a6e2012-02-25 20:51:20 +00001557llvm::Constant *
1558CodeGenModule::MaybeEmitGlobalStdInitializerListInitializer(const VarDecl *D,
1559 const Expr *rawInit) {
1560 ArrayRef<ExprWithCleanups::CleanupObject> cleanups;
1561 if (const ExprWithCleanups *withCleanups =
1562 dyn_cast<ExprWithCleanups>(rawInit)) {
1563 cleanups = withCleanups->getObjects();
1564 rawInit = withCleanups->getSubExpr();
1565 }
1566
1567 const InitListExpr *init = dyn_cast<InitListExpr>(rawInit);
1568 if (!init || !init->initializesStdInitializerList() ||
1569 init->getNumInits() == 0)
1570 return 0;
1571
1572 ASTContext &ctx = getContext();
Sebastian Redl19b1a6e2012-02-25 20:51:20 +00001573 unsigned numInits = init->getNumInits();
Sebastian Redl062a82c2012-02-27 23:20:01 +00001574 // FIXME: This check is here because we would otherwise silently miscompile
1575 // nested global std::initializer_lists. Better would be to have a real
1576 // implementation.
1577 for (unsigned i = 0; i < numInits; ++i) {
1578 const InitListExpr *inner = dyn_cast<InitListExpr>(init->getInit(i));
1579 if (inner && inner->initializesStdInitializerList()) {
1580 ErrorUnsupported(inner, "nested global std::initializer_list");
1581 return 0;
1582 }
1583 }
1584
1585 // Synthesize a fake VarDecl for the array and initialize that.
Sebastian Redl19b1a6e2012-02-25 20:51:20 +00001586 QualType elementType = init->getInit(0)->getType();
1587 llvm::APInt numElements(ctx.getTypeSize(ctx.getSizeType()), numInits);
1588 QualType arrayType = ctx.getConstantArrayType(elementType, numElements,
1589 ArrayType::Normal, 0);
1590
1591 IdentifierInfo *name = &ctx.Idents.get(D->getNameAsString() + "__initlist");
1592 TypeSourceInfo *sourceInfo = ctx.getTrivialTypeSourceInfo(
1593 arrayType, D->getLocation());
1594 VarDecl *backingArray = VarDecl::Create(ctx, const_cast<DeclContext*>(
1595 D->getDeclContext()),
1596 D->getLocStart(), D->getLocation(),
1597 name, arrayType, sourceInfo,
1598 SC_Static, SC_Static);
1599
1600 // Now clone the InitListExpr to initialize the array instead.
1601 // Incredible hack: we want to use the existing InitListExpr here, so we need
1602 // to tell it that it no longer initializes a std::initializer_list.
Benjamin Kramer3b6bef92012-08-24 11:54:20 +00001603 ArrayRef<Expr*> Inits(const_cast<InitListExpr*>(init)->getInits(),
1604 init->getNumInits());
1605 Expr *arrayInit = new (ctx) InitListExpr(ctx, init->getLBraceLoc(), Inits,
1606 init->getRBraceLoc());
Sebastian Redl19b1a6e2012-02-25 20:51:20 +00001607 arrayInit->setType(arrayType);
1608
1609 if (!cleanups.empty())
1610 arrayInit = ExprWithCleanups::Create(ctx, arrayInit, cleanups);
1611
1612 backingArray->setInit(arrayInit);
1613
1614 // Emit the definition of the array.
1615 EmitGlobalVarDefinition(backingArray);
1616
1617 // Inspect the initializer list to validate it and determine its type.
1618 // FIXME: doing this every time is probably inefficient; caching would be nice
1619 RecordDecl *record = init->getType()->castAs<RecordType>()->getDecl();
1620 RecordDecl::field_iterator field = record->field_begin();
1621 if (field == record->field_end()) {
1622 ErrorUnsupported(D, "weird std::initializer_list");
1623 return 0;
1624 }
1625 QualType elementPtr = ctx.getPointerType(elementType.withConst());
1626 // Start pointer.
1627 if (!ctx.hasSameType(field->getType(), elementPtr)) {
1628 ErrorUnsupported(D, "weird std::initializer_list");
1629 return 0;
1630 }
1631 ++field;
1632 if (field == record->field_end()) {
1633 ErrorUnsupported(D, "weird std::initializer_list");
1634 return 0;
1635 }
1636 bool isStartEnd = false;
1637 if (ctx.hasSameType(field->getType(), elementPtr)) {
1638 // End pointer.
1639 isStartEnd = true;
1640 } else if(!ctx.hasSameType(field->getType(), ctx.getSizeType())) {
1641 ErrorUnsupported(D, "weird std::initializer_list");
1642 return 0;
1643 }
1644
1645 // Now build an APValue representing the std::initializer_list.
1646 APValue initListValue(APValue::UninitStruct(), 0, 2);
1647 APValue &startField = initListValue.getStructField(0);
1648 APValue::LValuePathEntry startOffsetPathEntry;
1649 startOffsetPathEntry.ArrayIndex = 0;
1650 startField = APValue(APValue::LValueBase(backingArray),
1651 CharUnits::fromQuantity(0),
1652 llvm::makeArrayRef(startOffsetPathEntry),
1653 /*IsOnePastTheEnd=*/false, 0);
1654
1655 if (isStartEnd) {
1656 APValue &endField = initListValue.getStructField(1);
1657 APValue::LValuePathEntry endOffsetPathEntry;
1658 endOffsetPathEntry.ArrayIndex = numInits;
1659 endField = APValue(APValue::LValueBase(backingArray),
1660 ctx.getTypeSizeInChars(elementType) * numInits,
1661 llvm::makeArrayRef(endOffsetPathEntry),
1662 /*IsOnePastTheEnd=*/true, 0);
1663 } else {
1664 APValue &sizeField = initListValue.getStructField(1);
1665 sizeField = APValue(llvm::APSInt(numElements));
1666 }
1667
1668 // Emit the constant for the initializer_list.
Richard Smitha3ca41f2012-03-02 23:27:11 +00001669 llvm::Constant *llvmInit =
1670 EmitConstantValueForMemory(initListValue, D->getType());
Sebastian Redl19b1a6e2012-02-25 20:51:20 +00001671 assert(llvmInit && "failed to initialize as constant");
1672 return llvmInit;
1673}
1674
Peter Collingbourne4dc34eb2012-05-20 21:08:35 +00001675unsigned CodeGenModule::GetGlobalVarAddressSpace(const VarDecl *D,
1676 unsigned AddrSpace) {
1677 if (LangOpts.CUDA && CodeGenOpts.CUDAIsDevice) {
1678 if (D->hasAttr<CUDAConstantAttr>())
1679 AddrSpace = getContext().getTargetAddressSpace(LangAS::cuda_constant);
1680 else if (D->hasAttr<CUDASharedAttr>())
1681 AddrSpace = getContext().getTargetAddressSpace(LangAS::cuda_shared);
1682 else
1683 AddrSpace = getContext().getTargetAddressSpace(LangAS::cuda_device);
1684 }
1685
1686 return AddrSpace;
1687}
1688
Daniel Dunbarbd012ff2008-07-29 23:18:29 +00001689void CodeGenModule::EmitGlobalVarDefinition(const VarDecl *D) {
Chris Lattner8f32f712007-07-14 00:23:28 +00001690 llvm::Constant *Init = 0;
Eli Friedman77ba7082008-05-30 19:50:47 +00001691 QualType ASTTy = D->getType();
Richard Smith7ca48502012-02-13 22:16:19 +00001692 CXXRecordDecl *RD = ASTTy->getBaseElementTypeUnsafe()->getAsCXXRecordDecl();
1693 bool NeedsGlobalCtor = false;
1694 bool NeedsGlobalDtor = RD && !RD->hasTrivialDestructor();
Mike Stump1eb44332009-09-09 15:08:12 +00001695
Richard Smith2d6a5672012-01-14 04:30:29 +00001696 const VarDecl *InitDecl;
1697 const Expr *InitExpr = D->getAnyInitializer(InitDecl);
Sebastian Redl19b1a6e2012-02-25 20:51:20 +00001698
Anders Carlsson3bb92692010-01-26 17:43:42 +00001699 if (!InitExpr) {
Eli Friedmancd5f4aa2008-05-30 20:39:54 +00001700 // This is a tentative definition; tentative definitions are
Daniel Dunbar03f5ad92009-04-15 22:08:45 +00001701 // implicitly initialized with { 0 }.
1702 //
1703 // Note that tentative definitions are only emitted at the end of
1704 // a translation unit, so they should never have incomplete
1705 // type. In addition, EmitTentativeDefinition makes sure that we
1706 // never attempt to emit a tentative definition if a real one
1707 // exists. A use may still exists, however, so we still may need
1708 // to do a RAUW.
1709 assert(!ASTTy->isIncompleteType() && "Unexpected incomplete type");
Anders Carlssonb0d0ea02009-08-02 21:18:22 +00001710 Init = EmitNullConstant(D->getType());
Eli Friedman77ba7082008-05-30 19:50:47 +00001711 } else {
Sebastian Redl19b1a6e2012-02-25 20:51:20 +00001712 // If this is a std::initializer_list, emit the special initializer.
1713 Init = MaybeEmitGlobalStdInitializerListInitializer(D, InitExpr);
1714 // An empty init list will perform zero-initialization, which happens
1715 // to be exactly what we want.
1716 // FIXME: It does so in a global constructor, which is *not* what we
1717 // want.
1718
Fariborz Jahanian4904bf42012-06-26 16:06:38 +00001719 if (!Init) {
1720 initializedGlobalDecl = GlobalDecl(D);
Sebastian Redl19b1a6e2012-02-25 20:51:20 +00001721 Init = EmitConstantInit(*InitDecl);
Fariborz Jahanian4904bf42012-06-26 16:06:38 +00001722 }
Eli Friedman6e656f42009-02-20 01:18:21 +00001723 if (!Init) {
Anders Carlsson3bb92692010-01-26 17:43:42 +00001724 QualType T = InitExpr->getType();
Douglas Gregorc446d182010-05-05 20:15:55 +00001725 if (D->getType()->isReferenceType())
1726 T = D->getType();
Richard Smith2d6a5672012-01-14 04:30:29 +00001727
David Blaikie4e4d0842012-03-11 07:00:24 +00001728 if (getLangOpts().CPlusPlus) {
Anders Carlsson89ed31d2009-08-08 23:24:23 +00001729 Init = EmitNullConstant(T);
Richard Smith7ca48502012-02-13 22:16:19 +00001730 NeedsGlobalCtor = true;
Anders Carlsson89ed31d2009-08-08 23:24:23 +00001731 } else {
1732 ErrorUnsupported(D, "static initializer");
1733 Init = llvm::UndefValue::get(getTypes().ConvertType(T));
1734 }
John McCallbf40cb52010-07-15 23:40:35 +00001735 } else {
1736 // We don't need an initializer, so remove the entry for the delayed
Richard Smith7ca48502012-02-13 22:16:19 +00001737 // initializer position (just in case this entry was delayed) if we
1738 // also don't need to register a destructor.
David Blaikie4e4d0842012-03-11 07:00:24 +00001739 if (getLangOpts().CPlusPlus && !NeedsGlobalDtor)
John McCallbf40cb52010-07-15 23:40:35 +00001740 DelayedCXXInitPosition.erase(D);
Eli Friedman6e656f42009-02-20 01:18:21 +00001741 }
Eli Friedman77ba7082008-05-30 19:50:47 +00001742 }
Eli Friedman77ba7082008-05-30 19:50:47 +00001743
Chris Lattner2acc6e32011-07-18 04:24:23 +00001744 llvm::Type* InitType = Init->getType();
Chris Lattner570585c2009-03-21 09:16:30 +00001745 llvm::Constant *Entry = GetAddrOfGlobalVar(D, InitType);
Mike Stump1eb44332009-09-09 15:08:12 +00001746
Chris Lattner570585c2009-03-21 09:16:30 +00001747 // Strip off a bitcast if we got one back.
1748 if (llvm::ConstantExpr *CE = dyn_cast<llvm::ConstantExpr>(Entry)) {
Chris Lattner9d4a15f2009-07-16 16:48:25 +00001749 assert(CE->getOpcode() == llvm::Instruction::BitCast ||
1750 // all zero index gep.
1751 CE->getOpcode() == llvm::Instruction::GetElementPtr);
Chris Lattner570585c2009-03-21 09:16:30 +00001752 Entry = CE->getOperand(0);
1753 }
Mike Stump1eb44332009-09-09 15:08:12 +00001754
Chris Lattner570585c2009-03-21 09:16:30 +00001755 // Entry is now either a Function or GlobalVariable.
1756 llvm::GlobalVariable *GV = dyn_cast<llvm::GlobalVariable>(Entry);
Mike Stump1eb44332009-09-09 15:08:12 +00001757
Chris Lattner570585c2009-03-21 09:16:30 +00001758 // We have a definition after a declaration with the wrong type.
1759 // We must make a new GlobalVariable* and update everything that used OldGV
1760 // (a declaration or tentative definition) with the new GlobalVariable*
1761 // (which will be a definition).
1762 //
1763 // This happens if there is a prototype for a global (e.g.
1764 // "extern int x[];") and then a definition of a different type (e.g.
1765 // "int x[10];"). This also happens when an initializer has a different type
1766 // from the type of the global (this happens with unions).
Chris Lattner570585c2009-03-21 09:16:30 +00001767 if (GV == 0 ||
1768 GV->getType()->getElementType() != InitType ||
Peter Collingbourne207f4d82011-03-18 22:38:29 +00001769 GV->getType()->getAddressSpace() !=
Peter Collingbourne4dc34eb2012-05-20 21:08:35 +00001770 GetGlobalVarAddressSpace(D, getContext().getTargetAddressSpace(ASTTy))) {
Mike Stump1eb44332009-09-09 15:08:12 +00001771
John McCallf746aa62010-03-19 23:29:14 +00001772 // Move the old entry aside so that we'll create a new one.
Chris Lattner5f9e2722011-07-23 10:55:15 +00001773 Entry->setName(StringRef());
Daniel Dunbar232350d2009-02-19 05:36:41 +00001774
Chris Lattner570585c2009-03-21 09:16:30 +00001775 // Make a new global with the correct type, this is now guaranteed to work.
1776 GV = cast<llvm::GlobalVariable>(GetAddrOfGlobalVar(D, InitType));
Chris Lattner0558e792009-03-21 09:25:43 +00001777
Eli Friedman77ba7082008-05-30 19:50:47 +00001778 // Replace all uses of the old global with the new global
Mike Stump1eb44332009-09-09 15:08:12 +00001779 llvm::Constant *NewPtrForOldDecl =
Owen Anderson3c4972d2009-07-29 18:54:39 +00001780 llvm::ConstantExpr::getBitCast(GV, Entry->getType());
Chris Lattner570585c2009-03-21 09:16:30 +00001781 Entry->replaceAllUsesWith(NewPtrForOldDecl);
Eli Friedman77ba7082008-05-30 19:50:47 +00001782
1783 // Erase the old global, since it is no longer used.
Chris Lattner570585c2009-03-21 09:16:30 +00001784 cast<llvm::GlobalValue>(Entry)->eraseFromParent();
Chris Lattner8f32f712007-07-14 00:23:28 +00001785 }
Devang Patel8e53e722007-10-26 16:31:40 +00001786
Julien Lerouge77f68bb2011-09-09 22:41:49 +00001787 if (D->hasAttr<AnnotateAttr>())
1788 AddGlobalAnnotations(D, GV);
Nate Begeman8bd4afe2008-04-19 04:17:09 +00001789
Chris Lattner88a69ad2007-07-13 05:13:43 +00001790 GV->setInitializer(Init);
Chris Lattnere78b86f2009-08-05 05:20:29 +00001791
1792 // If it is safe to mark the global 'constant', do so now.
Richard Smitha9b21d22012-02-17 06:48:11 +00001793 GV->setConstant(!NeedsGlobalCtor && !NeedsGlobalDtor &&
1794 isTypeConstant(D->getType(), true));
Mike Stump1eb44332009-09-09 15:08:12 +00001795
Ken Dyck8b752f12010-01-27 17:10:57 +00001796 GV->setAlignment(getContext().getDeclAlign(D).getQuantity());
Richard Smitha9b21d22012-02-17 06:48:11 +00001797
Chris Lattner88a69ad2007-07-13 05:13:43 +00001798 // Set the llvm linkage type as appropriate.
Fariborz Jahanian354e7122010-10-27 16:21:54 +00001799 llvm::GlobalValue::LinkageTypes Linkage =
1800 GetLLVMLinkageVarDefinition(D, GV);
1801 GV->setLinkage(Linkage);
1802 if (Linkage == llvm::GlobalVariable::CommonLinkage)
Chris Lattnere78b86f2009-08-05 05:20:29 +00001803 // common vars aren't constant even if declared const.
1804 GV->setConstant(false);
Daniel Dunbar7e714cd2009-04-10 20:26:50 +00001805
Daniel Dunbar7c65e992009-04-14 08:05:55 +00001806 SetCommonAttributes(D, GV);
Daniel Dunbar04d40782009-04-14 06:00:08 +00001807
John McCall3030eb82010-11-06 09:44:32 +00001808 // Emit the initializer function if necessary.
Richard Smith7ca48502012-02-13 22:16:19 +00001809 if (NeedsGlobalCtor || NeedsGlobalDtor)
1810 EmitCXXGlobalVarDeclInitFunc(D, GV, NeedsGlobalCtor);
John McCall3030eb82010-11-06 09:44:32 +00001811
Kostya Serebryany05c5ebc2012-08-21 06:53:28 +00001812 // If we are compiling with ASan, add metadata indicating dynamically
1813 // initialized globals.
Will Dietz4f45bc02013-01-18 11:30:38 +00001814 if (SanOpts.Address && NeedsGlobalCtor) {
Kostya Serebryany05c5ebc2012-08-21 06:53:28 +00001815 llvm::Module &M = getModule();
1816
1817 llvm::NamedMDNode *DynamicInitializers =
1818 M.getOrInsertNamedMetadata("llvm.asan.dynamically_initialized_globals");
1819 llvm::Value *GlobalToAdd[] = { GV };
1820 llvm::MDNode *ThisGlobal = llvm::MDNode::get(VMContext, GlobalToAdd);
1821 DynamicInitializers->addOperand(ThisGlobal);
1822 }
1823
Sanjiv Gupta686226b2008-06-05 08:59:10 +00001824 // Emit global variable debug information.
Eric Christopher73fb3502011-10-13 21:45:18 +00001825 if (CGDebugInfo *DI = getModuleDebugInfo())
Douglas Gregor4cdad312012-10-23 20:05:01 +00001826 if (getCodeGenOpts().getDebugInfo() >= CodeGenOptions::LimitedDebugInfo)
Alexey Samsonovfd00eec2012-05-04 07:39:27 +00001827 DI->EmitGlobalVariable(GV, D);
Chris Lattner88a69ad2007-07-13 05:13:43 +00001828}
Reid Spencer5f016e22007-07-11 17:01:13 +00001829
Fariborz Jahanian354e7122010-10-27 16:21:54 +00001830llvm::GlobalValue::LinkageTypes
1831CodeGenModule::GetLLVMLinkageVarDefinition(const VarDecl *D,
1832 llvm::GlobalVariable *GV) {
1833 GVALinkage Linkage = getContext().GetGVALinkageForVariable(D);
1834 if (Linkage == GVA_Internal)
1835 return llvm::Function::InternalLinkage;
1836 else if (D->hasAttr<DLLImportAttr>())
1837 return llvm::Function::DLLImportLinkage;
1838 else if (D->hasAttr<DLLExportAttr>())
1839 return llvm::Function::DLLExportLinkage;
1840 else if (D->hasAttr<WeakAttr>()) {
1841 if (GV->isConstant())
1842 return llvm::GlobalVariable::WeakODRLinkage;
1843 else
1844 return llvm::GlobalVariable::WeakAnyLinkage;
1845 } else if (Linkage == GVA_TemplateInstantiation ||
1846 Linkage == GVA_ExplicitTemplateInstantiation)
John McCall99ace162011-04-12 01:46:54 +00001847 return llvm::GlobalVariable::WeakODRLinkage;
David Blaikie4e4d0842012-03-11 07:00:24 +00001848 else if (!getLangOpts().CPlusPlus &&
Eric Christophera6cf1e72010-12-02 02:45:55 +00001849 ((!CodeGenOpts.NoCommon && !D->getAttr<NoCommonAttr>()) ||
1850 D->getAttr<CommonAttr>()) &&
Fariborz Jahanian354e7122010-10-27 16:21:54 +00001851 !D->hasExternalStorage() && !D->getInit() &&
Fariborz Jahanianab27d6e2011-06-20 17:50:03 +00001852 !D->getAttr<SectionAttr>() && !D->isThreadSpecified() &&
1853 !D->getAttr<WeakImportAttr>()) {
Fariborz Jahanian354e7122010-10-27 16:21:54 +00001854 // Thread local vars aren't considered common linkage.
1855 return llvm::GlobalVariable::CommonLinkage;
1856 }
1857 return llvm::GlobalVariable::ExternalLinkage;
1858}
1859
John McCalla923c972012-12-12 22:21:47 +00001860/// Replace the uses of a function that was declared with a non-proto type.
1861/// We want to silently drop extra arguments from call sites
1862static void replaceUsesOfNonProtoConstant(llvm::Constant *old,
1863 llvm::Function *newFn) {
1864 // Fast path.
1865 if (old->use_empty()) return;
1866
1867 llvm::Type *newRetTy = newFn->getReturnType();
1868 SmallVector<llvm::Value*, 4> newArgs;
1869
1870 for (llvm::Value::use_iterator ui = old->use_begin(), ue = old->use_end();
1871 ui != ue; ) {
1872 llvm::Value::use_iterator use = ui++; // Increment before the use is erased.
1873 llvm::User *user = *use;
1874
1875 // Recognize and replace uses of bitcasts. Most calls to
1876 // unprototyped functions will use bitcasts.
1877 if (llvm::ConstantExpr *bitcast = dyn_cast<llvm::ConstantExpr>(user)) {
1878 if (bitcast->getOpcode() == llvm::Instruction::BitCast)
1879 replaceUsesOfNonProtoConstant(bitcast, newFn);
1880 continue;
1881 }
1882
1883 // Recognize calls to the function.
1884 llvm::CallSite callSite(user);
1885 if (!callSite) continue;
1886 if (!callSite.isCallee(use)) continue;
1887
1888 // If the return types don't match exactly, then we can't
1889 // transform this call unless it's dead.
1890 if (callSite->getType() != newRetTy && !callSite->use_empty())
1891 continue;
1892
1893 // Get the call site's attribute list.
Bill Wendlingb263bdf2013-01-27 02:46:53 +00001894 SmallVector<llvm::AttributeSet, 8> newAttrs;
John McCalla923c972012-12-12 22:21:47 +00001895 llvm::AttributeSet oldAttrs = callSite.getAttributes();
1896
1897 // Collect any return attributes from the call.
Bill Wendlinga37ce612013-01-21 21:57:40 +00001898 if (oldAttrs.hasAttributes(llvm::AttributeSet::ReturnIndex))
Bill Wendlinged01f842013-01-21 22:45:00 +00001899 newAttrs.push_back(
Bill Wendlingb263bdf2013-01-27 02:46:53 +00001900 llvm::AttributeSet::get(newFn->getContext(),
1901 oldAttrs.getRetAttributes()));
John McCalla923c972012-12-12 22:21:47 +00001902
1903 // If the function was passed too few arguments, don't transform.
1904 unsigned newNumArgs = newFn->arg_size();
1905 if (callSite.arg_size() < newNumArgs) continue;
1906
1907 // If extra arguments were passed, we silently drop them.
1908 // If any of the types mismatch, we don't transform.
1909 unsigned argNo = 0;
1910 bool dontTransform = false;
1911 for (llvm::Function::arg_iterator ai = newFn->arg_begin(),
1912 ae = newFn->arg_end(); ai != ae; ++ai, ++argNo) {
1913 if (callSite.getArgument(argNo)->getType() != ai->getType()) {
1914 dontTransform = true;
1915 break;
1916 }
1917
1918 // Add any parameter attributes.
Bill Wendling89530e42013-01-23 06:15:10 +00001919 if (oldAttrs.hasAttributes(argNo + 1))
1920 newAttrs.
Bill Wendlingb263bdf2013-01-27 02:46:53 +00001921 push_back(llvm::
1922 AttributeSet::get(newFn->getContext(),
1923 oldAttrs.getParamAttributes(argNo + 1)));
John McCalla923c972012-12-12 22:21:47 +00001924 }
1925 if (dontTransform)
1926 continue;
1927
Bill Wendlinge67e4c92013-01-18 21:26:07 +00001928 if (oldAttrs.hasAttributes(llvm::AttributeSet::FunctionIndex))
Bill Wendlingb263bdf2013-01-27 02:46:53 +00001929 newAttrs.push_back(llvm::AttributeSet::get(newFn->getContext(),
1930 oldAttrs.getFnAttributes()));
John McCalla923c972012-12-12 22:21:47 +00001931
1932 // Okay, we can transform this. Create the new call instruction and copy
1933 // over the required information.
1934 newArgs.append(callSite.arg_begin(), callSite.arg_begin() + argNo);
1935
1936 llvm::CallSite newCall;
1937 if (callSite.isCall()) {
1938 newCall = llvm::CallInst::Create(newFn, newArgs, "",
1939 callSite.getInstruction());
1940 } else {
1941 llvm::InvokeInst *oldInvoke =
1942 cast<llvm::InvokeInst>(callSite.getInstruction());
1943 newCall = llvm::InvokeInst::Create(newFn,
1944 oldInvoke->getNormalDest(),
1945 oldInvoke->getUnwindDest(),
1946 newArgs, "",
1947 callSite.getInstruction());
1948 }
1949 newArgs.clear(); // for the next iteration
1950
1951 if (!newCall->getType()->isVoidTy())
1952 newCall->takeName(callSite.getInstruction());
1953 newCall.setAttributes(
1954 llvm::AttributeSet::get(newFn->getContext(), newAttrs));
1955 newCall.setCallingConv(callSite.getCallingConv());
1956
1957 // Finally, remove the old call, replacing any uses with the new one.
1958 if (!callSite->use_empty())
1959 callSite->replaceAllUsesWith(newCall.getInstruction());
1960
1961 // Copy debug location attached to CI.
1962 if (!callSite->getDebugLoc().isUnknown())
1963 newCall->setDebugLoc(callSite->getDebugLoc());
1964 callSite->eraseFromParent();
1965 }
1966}
1967
Chris Lattnerbdb01322009-05-05 06:16:31 +00001968/// ReplaceUsesOfNonProtoTypeWithRealFunction - This function is called when we
1969/// implement a function with no prototype, e.g. "int foo() {}". If there are
1970/// existing call uses of the old function in the module, this adjusts them to
1971/// call the new function directly.
1972///
1973/// This is not just a cleanup: the always_inline pass requires direct calls to
1974/// functions to be able to inline them. If there is a bitcast in the way, it
1975/// won't inline them. Instcombine normally deletes these calls, but it isn't
1976/// run at -O0.
1977static void ReplaceUsesOfNonProtoTypeWithRealFunction(llvm::GlobalValue *Old,
1978 llvm::Function *NewFn) {
1979 // If we're redefining a global as a function, don't transform it.
John McCalla923c972012-12-12 22:21:47 +00001980 if (!isa<llvm::Function>(Old)) return;
Mike Stump1eb44332009-09-09 15:08:12 +00001981
John McCalla923c972012-12-12 22:21:47 +00001982 replaceUsesOfNonProtoConstant(Old, NewFn);
Chris Lattnerbdb01322009-05-05 06:16:31 +00001983}
1984
Rafael Espindola02503932012-03-08 15:51:03 +00001985void CodeGenModule::HandleCXXStaticMemberVarInstantiation(VarDecl *VD) {
1986 TemplateSpecializationKind TSK = VD->getTemplateSpecializationKind();
1987 // If we have a definition, this might be a deferred decl. If the
1988 // instantiation is explicit, make sure we emit it at the end.
1989 if (VD->getDefinition() && TSK == TSK_ExplicitInstantiationDefinition)
1990 GetAddrOfGlobalVar(VD);
Argyrios Kyrtzidisafda9052013-02-24 00:05:01 +00001991
1992 EmitTopLevelDecl(VD);
Rafael Espindola234fe652012-03-05 10:54:55 +00001993}
Daniel Dunbarbd012ff2008-07-29 23:18:29 +00001994
Chris Lattnerb4880ba2009-05-12 21:21:08 +00001995void CodeGenModule::EmitGlobalFunctionDefinition(GlobalDecl GD) {
Chris Lattnerb4880ba2009-05-12 21:21:08 +00001996 const FunctionDecl *D = cast<FunctionDecl>(GD.getDecl());
John McCalld26bc762011-03-09 04:27:21 +00001997
John McCall1f6f9612011-03-09 08:12:35 +00001998 // Compute the function info and LLVM type.
John McCallde5d3c72012-02-17 03:33:10 +00001999 const CGFunctionInfo &FI = getTypes().arrangeGlobalDeclaration(GD);
2000 llvm::FunctionType *Ty = getTypes().GetFunctionType(FI);
John McCalld26bc762011-03-09 04:27:21 +00002001
Chris Lattner9fa959d2009-05-12 20:58:15 +00002002 // Get or create the prototype for the function.
Chris Lattnerb4880ba2009-05-12 21:21:08 +00002003 llvm::Constant *Entry = GetAddrOfFunction(GD, Ty);
Mike Stump1eb44332009-09-09 15:08:12 +00002004
Chris Lattner0558e792009-03-21 09:25:43 +00002005 // Strip off a bitcast if we got one back.
2006 if (llvm::ConstantExpr *CE = dyn_cast<llvm::ConstantExpr>(Entry)) {
2007 assert(CE->getOpcode() == llvm::Instruction::BitCast);
2008 Entry = CE->getOperand(0);
2009 }
Mike Stump1eb44332009-09-09 15:08:12 +00002010
2011
Chris Lattner0558e792009-03-21 09:25:43 +00002012 if (cast<llvm::GlobalValue>(Entry)->getType()->getElementType() != Ty) {
Chris Lattnerbdb01322009-05-05 06:16:31 +00002013 llvm::GlobalValue *OldFn = cast<llvm::GlobalValue>(Entry);
Mike Stump1eb44332009-09-09 15:08:12 +00002014
Daniel Dunbar42745812009-03-09 23:53:08 +00002015 // If the types mismatch then we have to rewrite the definition.
Chris Lattnerbdb01322009-05-05 06:16:31 +00002016 assert(OldFn->isDeclaration() &&
Chris Lattner0558e792009-03-21 09:25:43 +00002017 "Shouldn't replace non-declaration");
Chris Lattner34809502009-03-21 08:53:37 +00002018
Chris Lattner62b33ea2009-03-21 08:38:50 +00002019 // F is the Function* for the one with the wrong type, we must make a new
2020 // Function* and update everything that used F (a declaration) with the new
2021 // Function* (which will be a definition).
2022 //
2023 // This happens if there is a prototype for a function
2024 // (e.g. "int f()") and then a definition of a different type
John McCallf746aa62010-03-19 23:29:14 +00002025 // (e.g. "int f(int x)"). Move the old function aside so that it
2026 // doesn't interfere with GetAddrOfFunction.
Chris Lattner5f9e2722011-07-23 10:55:15 +00002027 OldFn->setName(StringRef());
Chris Lattnerb4880ba2009-05-12 21:21:08 +00002028 llvm::Function *NewFn = cast<llvm::Function>(GetAddrOfFunction(GD, Ty));
Mike Stump1eb44332009-09-09 15:08:12 +00002029
John McCalla923c972012-12-12 22:21:47 +00002030 // This might be an implementation of a function without a
2031 // prototype, in which case, try to do special replacement of
2032 // calls which match the new prototype. The really key thing here
2033 // is that we also potentially drop arguments from the call site
2034 // so as to make a direct call, which makes the inliner happier
2035 // and suppresses a number of optimizer warnings (!) about
2036 // dropping arguments.
2037 if (!OldFn->use_empty()) {
Chris Lattnerbdb01322009-05-05 06:16:31 +00002038 ReplaceUsesOfNonProtoTypeWithRealFunction(OldFn, NewFn);
Chris Lattner9fa959d2009-05-12 20:58:15 +00002039 OldFn->removeDeadConstantUsers();
2040 }
Mike Stump1eb44332009-09-09 15:08:12 +00002041
Chris Lattner62b33ea2009-03-21 08:38:50 +00002042 // Replace uses of F with the Function we will endow with a body.
Chris Lattnerbdb01322009-05-05 06:16:31 +00002043 if (!Entry->use_empty()) {
Mike Stump1eb44332009-09-09 15:08:12 +00002044 llvm::Constant *NewPtrForOldDecl =
Owen Anderson3c4972d2009-07-29 18:54:39 +00002045 llvm::ConstantExpr::getBitCast(NewFn, Entry->getType());
Chris Lattnerbdb01322009-05-05 06:16:31 +00002046 Entry->replaceAllUsesWith(NewPtrForOldDecl);
2047 }
Mike Stump1eb44332009-09-09 15:08:12 +00002048
Chris Lattner62b33ea2009-03-21 08:38:50 +00002049 // Ok, delete the old function now, which is dead.
Chris Lattnerbdb01322009-05-05 06:16:31 +00002050 OldFn->eraseFromParent();
Mike Stump1eb44332009-09-09 15:08:12 +00002051
Chris Lattner0558e792009-03-21 09:25:43 +00002052 Entry = NewFn;
Daniel Dunbarbd012ff2008-07-29 23:18:29 +00002053 }
Mike Stump1eb44332009-09-09 15:08:12 +00002054
John McCall112c9672010-11-02 21:04:24 +00002055 // We need to set linkage and visibility on the function before
2056 // generating code for it because various parts of IR generation
2057 // want to propagate this information down (e.g. to local static
2058 // declarations).
Chris Lattner0558e792009-03-21 09:25:43 +00002059 llvm::Function *Fn = cast<llvm::Function>(Entry);
John McCall8b242332010-05-25 04:30:21 +00002060 setFunctionLinkage(D, Fn);
Daniel Dunbarbd012ff2008-07-29 23:18:29 +00002061
John McCall112c9672010-11-02 21:04:24 +00002062 // FIXME: this is redundant with part of SetFunctionDefinitionAttributes
Anders Carlsson0ffeaad2011-01-29 19:39:23 +00002063 setGlobalVisibility(Fn, D);
John McCall112c9672010-11-02 21:04:24 +00002064
John McCalld26bc762011-03-09 04:27:21 +00002065 CodeGenFunction(*this).GenerateCode(D, Fn, FI);
Daniel Dunbar6bfed7e2008-08-01 00:01:51 +00002066
Daniel Dunbar7c65e992009-04-14 08:05:55 +00002067 SetFunctionDefinitionAttributes(D, Fn);
2068 SetLLVMFunctionAttributesForDefinition(D, Fn);
Mike Stump1eb44332009-09-09 15:08:12 +00002069
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +00002070 if (const ConstructorAttr *CA = D->getAttr<ConstructorAttr>())
Daniel Dunbar219df662008-09-08 23:44:31 +00002071 AddGlobalCtor(Fn, CA->getPriority());
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +00002072 if (const DestructorAttr *DA = D->getAttr<DestructorAttr>())
Daniel Dunbar219df662008-09-08 23:44:31 +00002073 AddGlobalDtor(Fn, DA->getPriority());
Julien Lerouge77f68bb2011-09-09 22:41:49 +00002074 if (D->hasAttr<AnnotateAttr>())
2075 AddGlobalAnnotations(D, Fn);
Daniel Dunbarbd012ff2008-07-29 23:18:29 +00002076}
2077
John McCallf746aa62010-03-19 23:29:14 +00002078void CodeGenModule::EmitAliasDefinition(GlobalDecl GD) {
2079 const ValueDecl *D = cast<ValueDecl>(GD.getDecl());
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +00002080 const AliasAttr *AA = D->getAttr<AliasAttr>();
Chris Lattnerbd532712009-03-22 21:47:11 +00002081 assert(AA && "Not an alias?");
2082
Chris Lattner5f9e2722011-07-23 10:55:15 +00002083 StringRef MangledName = getMangledName(GD);
Mike Stump1eb44332009-09-09 15:08:12 +00002084
John McCallf746aa62010-03-19 23:29:14 +00002085 // If there is a definition in the module, then it wins over the alias.
2086 // This is dubious, but allow it to be safe. Just ignore the alias.
2087 llvm::GlobalValue *Entry = GetGlobalValue(MangledName);
2088 if (Entry && !Entry->isDeclaration())
2089 return;
2090
Chris Lattner2acc6e32011-07-18 04:24:23 +00002091 llvm::Type *DeclTy = getTypes().ConvertTypeForMem(D->getType());
Chris Lattnerbd532712009-03-22 21:47:11 +00002092
2093 // Create a reference to the named value. This ensures that it is emitted
2094 // if a deferred decl.
2095 llvm::Constant *Aliasee;
2096 if (isa<llvm::FunctionType>(DeclTy))
Alex Rosenbergc857ce82012-10-05 23:12:53 +00002097 Aliasee = GetOrCreateLLVMFunction(AA->getAliasee(), DeclTy, GD,
Anders Carlsson1faa89f2011-02-05 04:35:53 +00002098 /*ForVTable=*/false);
Chris Lattnerbd532712009-03-22 21:47:11 +00002099 else
John McCallf746aa62010-03-19 23:29:14 +00002100 Aliasee = GetOrCreateLLVMGlobal(AA->getAliasee(),
Owen Anderson96e0fc72009-07-29 22:16:19 +00002101 llvm::PointerType::getUnqual(DeclTy), 0);
Chris Lattnerbd532712009-03-22 21:47:11 +00002102
2103 // Create the new alias itself, but don't set a name yet.
Mike Stump1eb44332009-09-09 15:08:12 +00002104 llvm::GlobalValue *GA =
Chris Lattnerbd532712009-03-22 21:47:11 +00002105 new llvm::GlobalAlias(Aliasee->getType(),
2106 llvm::Function::ExternalLinkage,
2107 "", Aliasee, &getModule());
Mike Stump1eb44332009-09-09 15:08:12 +00002108
Chris Lattnerbd532712009-03-22 21:47:11 +00002109 if (Entry) {
John McCallf746aa62010-03-19 23:29:14 +00002110 assert(Entry->isDeclaration());
2111
Chris Lattnerbd532712009-03-22 21:47:11 +00002112 // If there is a declaration in the module, then we had an extern followed
2113 // by the alias, as in:
2114 // extern int test6();
2115 // ...
2116 // int test6() __attribute__((alias("test7")));
2117 //
2118 // Remove it and replace uses of it with the alias.
John McCallf746aa62010-03-19 23:29:14 +00002119 GA->takeName(Entry);
Mike Stump1eb44332009-09-09 15:08:12 +00002120
Owen Anderson3c4972d2009-07-29 18:54:39 +00002121 Entry->replaceAllUsesWith(llvm::ConstantExpr::getBitCast(GA,
Chris Lattnerbd532712009-03-22 21:47:11 +00002122 Entry->getType()));
Chris Lattnerbd532712009-03-22 21:47:11 +00002123 Entry->eraseFromParent();
John McCallf746aa62010-03-19 23:29:14 +00002124 } else {
Anders Carlsson9a20d552010-06-22 16:16:50 +00002125 GA->setName(MangledName);
Chris Lattnerbd532712009-03-22 21:47:11 +00002126 }
Mike Stump1eb44332009-09-09 15:08:12 +00002127
Daniel Dunbar7c65e992009-04-14 08:05:55 +00002128 // Set attributes which are particular to an alias; this is a
2129 // specialization of the attributes which may be set on a global
2130 // variable/function.
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +00002131 if (D->hasAttr<DLLExportAttr>()) {
Daniel Dunbar7c65e992009-04-14 08:05:55 +00002132 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
2133 // The dllexport attribute is ignored for undefined symbols.
Argyrios Kyrtzidis06a54a32010-07-07 11:31:19 +00002134 if (FD->hasBody())
Daniel Dunbar7c65e992009-04-14 08:05:55 +00002135 GA->setLinkage(llvm::Function::DLLExportLinkage);
2136 } else {
2137 GA->setLinkage(llvm::Function::DLLExportLinkage);
2138 }
Mike Stump1eb44332009-09-09 15:08:12 +00002139 } else if (D->hasAttr<WeakAttr>() ||
Rafael Espindola11e8ce72010-02-23 22:00:30 +00002140 D->hasAttr<WeakRefAttr>() ||
Douglas Gregor0a0d2b12011-03-23 00:50:03 +00002141 D->isWeakImported()) {
Daniel Dunbar7c65e992009-04-14 08:05:55 +00002142 GA->setLinkage(llvm::Function::WeakAnyLinkage);
2143 }
2144
2145 SetCommonAttributes(D, GA);
Chris Lattnerbd532712009-03-22 21:47:11 +00002146}
2147
Benjamin Kramer8dd55a32011-07-14 17:45:50 +00002148llvm::Function *CodeGenModule::getIntrinsic(unsigned IID,
Chris Lattner2d3ba4f2011-07-23 17:14:25 +00002149 ArrayRef<llvm::Type*> Tys) {
Jay Foaddf983a82011-07-12 14:06:48 +00002150 return llvm::Intrinsic::getDeclaration(&getModule(), (llvm::Intrinsic::ID)IID,
Benjamin Kramer8dd55a32011-07-14 17:45:50 +00002151 Tys);
Chris Lattner7acda7c2007-12-18 00:25:38 +00002152}
Chris Lattnerbef20ac2007-08-31 04:31:45 +00002153
Daniel Dunbar1d552912009-07-23 22:52:48 +00002154static llvm::StringMapEntry<llvm::Constant*> &
2155GetConstantCFStringEntry(llvm::StringMap<llvm::Constant*> &Map,
2156 const StringLiteral *Literal,
Daniel Dunbar70ee9752009-07-23 23:41:22 +00002157 bool TargetIsLSB,
Daniel Dunbar1d552912009-07-23 22:52:48 +00002158 bool &IsUTF16,
2159 unsigned &StringLength) {
Chris Lattner5f9e2722011-07-23 10:55:15 +00002160 StringRef String = Literal->getString();
Benjamin Kramer2f4eaef2010-08-17 12:54:38 +00002161 unsigned NumBytes = String.size();
Daniel Dunbar1d552912009-07-23 22:52:48 +00002162
Daniel Dunbarf015b032009-09-22 10:03:52 +00002163 // Check for simple case.
2164 if (!Literal->containsNonAsciiOrNull()) {
2165 StringLength = NumBytes;
Benjamin Kramer2f4eaef2010-08-17 12:54:38 +00002166 return Map.GetOrCreateValue(String);
Daniel Dunbarf015b032009-09-22 10:03:52 +00002167 }
2168
Bill Wendling84392d02012-03-30 00:26:17 +00002169 // Otherwise, convert the UTF8 literals into a string of shorts.
2170 IsUTF16 = true;
2171
2172 SmallVector<UTF16, 128> ToBuf(NumBytes + 1); // +1 for ending nulls.
Roman Divacky31ba6132012-09-06 15:59:27 +00002173 const UTF8 *FromPtr = (const UTF8 *)String.data();
Daniel Dunbar1d552912009-07-23 22:52:48 +00002174 UTF16 *ToPtr = &ToBuf[0];
Mike Stump1eb44332009-09-09 15:08:12 +00002175
Fariborz Jahaniane7ddfb92010-09-07 19:57:04 +00002176 (void)ConvertUTF8toUTF16(&FromPtr, FromPtr + NumBytes,
2177 &ToPtr, ToPtr + NumBytes,
2178 strictConversion);
Mike Stump1eb44332009-09-09 15:08:12 +00002179
Daniel Dunbar70ee9752009-07-23 23:41:22 +00002180 // ConvertUTF8toUTF16 returns the length in ToPtr.
Daniel Dunbar1d552912009-07-23 22:52:48 +00002181 StringLength = ToPtr - &ToBuf[0];
Daniel Dunbar70ee9752009-07-23 23:41:22 +00002182
Bill Wendling84392d02012-03-30 00:26:17 +00002183 // Add an explicit null.
2184 *ToPtr = 0;
2185 return Map.
2186 GetOrCreateValue(StringRef(reinterpret_cast<const char *>(ToBuf.data()),
2187 (StringLength + 1) * 2));
Daniel Dunbar1d552912009-07-23 22:52:48 +00002188}
2189
Fariborz Jahaniancf8e1682011-05-13 18:13:10 +00002190static llvm::StringMapEntry<llvm::Constant*> &
2191GetConstantStringEntry(llvm::StringMap<llvm::Constant*> &Map,
Bill Wendling8322c232012-03-29 22:12:09 +00002192 const StringLiteral *Literal,
2193 unsigned &StringLength) {
2194 StringRef String = Literal->getString();
2195 StringLength = String.size();
2196 return Map.GetOrCreateValue(String);
Fariborz Jahaniancf8e1682011-05-13 18:13:10 +00002197}
2198
Daniel Dunbar1d552912009-07-23 22:52:48 +00002199llvm::Constant *
2200CodeGenModule::GetAddrOfConstantCFString(const StringLiteral *Literal) {
2201 unsigned StringLength = 0;
2202 bool isUTF16 = false;
2203 llvm::StringMapEntry<llvm::Constant*> &Entry =
Mike Stump1eb44332009-09-09 15:08:12 +00002204 GetConstantCFStringEntry(CFConstantStringMap, Literal,
Micah Villmow25a6a842012-10-08 16:25:52 +00002205 getDataLayout().isLittleEndian(),
Daniel Dunbar70ee9752009-07-23 23:41:22 +00002206 isUTF16, StringLength);
Mike Stump1eb44332009-09-09 15:08:12 +00002207
Daniel Dunbar1d552912009-07-23 22:52:48 +00002208 if (llvm::Constant *C = Entry.getValue())
2209 return C;
Mike Stump1eb44332009-09-09 15:08:12 +00002210
Chris Lattner8b418682012-02-07 00:39:47 +00002211 llvm::Constant *Zero = llvm::Constant::getNullValue(Int32Ty);
Daniel Dunbar3e9df992008-08-23 18:37:06 +00002212 llvm::Constant *Zeros[] = { Zero, Zero };
Mike Stump1eb44332009-09-09 15:08:12 +00002213
Chris Lattner9d4a15f2009-07-16 16:48:25 +00002214 // If we don't already have it, get __CFConstantStringClassReference.
Anders Carlssonc9e20912007-08-21 00:21:21 +00002215 if (!CFConstantStringClassRef) {
Chris Lattner2acc6e32011-07-18 04:24:23 +00002216 llvm::Type *Ty = getTypes().ConvertType(getContext().IntTy);
Owen Anderson96e0fc72009-07-29 22:16:19 +00002217 Ty = llvm::ArrayType::get(Ty, 0);
Mike Stump1eb44332009-09-09 15:08:12 +00002218 llvm::Constant *GV = CreateRuntimeVariable(Ty,
Chris Lattner9d4a15f2009-07-16 16:48:25 +00002219 "__CFConstantStringClassReference");
Daniel Dunbar3e9df992008-08-23 18:37:06 +00002220 // Decay array -> ptr
2221 CFConstantStringClassRef =
Jay Foada5c04342011-07-21 14:31:17 +00002222 llvm::ConstantExpr::getGetElementPtr(GV, Zeros);
Anders Carlssonc9e20912007-08-21 00:21:21 +00002223 }
Mike Stump1eb44332009-09-09 15:08:12 +00002224
Anders Carlssone3daa762008-11-15 18:54:24 +00002225 QualType CFTy = getContext().getCFConstantStringType();
Daniel Dunbar3e9df992008-08-23 18:37:06 +00002226
Chris Lattner2acc6e32011-07-18 04:24:23 +00002227 llvm::StructType *STy =
Anders Carlssone3daa762008-11-15 18:54:24 +00002228 cast<llvm::StructType>(getTypes().ConvertType(CFTy));
2229
Benjamin Kramer1d236ab2011-10-15 12:20:02 +00002230 llvm::Constant *Fields[4];
Douglas Gregor44b43212008-12-11 16:49:14 +00002231
Anders Carlssonc9e20912007-08-21 00:21:21 +00002232 // Class pointer.
Anders Carlsson5add6832009-08-16 05:55:31 +00002233 Fields[0] = CFConstantStringClassRef;
Mike Stump1eb44332009-09-09 15:08:12 +00002234
Anders Carlssonc9e20912007-08-21 00:21:21 +00002235 // Flags.
Chris Lattner2acc6e32011-07-18 04:24:23 +00002236 llvm::Type *Ty = getTypes().ConvertType(getContext().UnsignedIntTy);
Mike Stump1eb44332009-09-09 15:08:12 +00002237 Fields[1] = isUTF16 ? llvm::ConstantInt::get(Ty, 0x07d0) :
Anders Carlsson5add6832009-08-16 05:55:31 +00002238 llvm::ConstantInt::get(Ty, 0x07C8);
2239
Anders Carlssonc9e20912007-08-21 00:21:21 +00002240 // String pointer.
Bill Wendling84392d02012-03-30 00:26:17 +00002241 llvm::Constant *C = 0;
2242 if (isUTF16) {
2243 ArrayRef<uint16_t> Arr =
David Greene5ba58a12013-01-15 22:09:41 +00002244 llvm::makeArrayRef<uint16_t>(reinterpret_cast<uint16_t*>(
2245 const_cast<char *>(Entry.getKey().data())),
Bill Wendling84392d02012-03-30 00:26:17 +00002246 Entry.getKey().size() / 2);
2247 C = llvm::ConstantDataArray::get(VMContext, Arr);
2248 } else {
2249 C = llvm::ConstantDataArray::getString(VMContext, Entry.getKey());
2250 }
Daniel Dunbara9668e02009-04-03 00:57:44 +00002251
Chris Lattner95b851e2009-07-16 05:03:48 +00002252 llvm::GlobalValue::LinkageTypes Linkage;
Bill Wendling1bf7a3f2012-01-10 08:46:39 +00002253 if (isUTF16)
Chris Lattner278b9f02009-10-14 05:55:45 +00002254 // FIXME: why do utf strings get "_" labels instead of "L" labels?
Chris Lattner95b851e2009-07-16 05:03:48 +00002255 Linkage = llvm::GlobalValue::InternalLinkage;
Bill Wendling1bf7a3f2012-01-10 08:46:39 +00002256 else
Rafael Espindola584acf22011-03-14 17:55:00 +00002257 // FIXME: With OS X ld 123.2 (xcode 4) and LTO we would get a linker error
2258 // when using private linkage. It is not clear if this is a bug in ld
2259 // or a reasonable new restriction.
Rafael Espindoladc0f1372011-03-14 21:08:19 +00002260 Linkage = llvm::GlobalValue::LinkerPrivateLinkage;
Chris Lattner278b9f02009-10-14 05:55:45 +00002261
Bill Wendling1bf7a3f2012-01-10 08:46:39 +00002262 // Note: -fwritable-strings doesn't make the backing store strings of
2263 // CFStrings writable. (See <rdar://problem/10657500>)
Mike Stump1eb44332009-09-09 15:08:12 +00002264 llvm::GlobalVariable *GV =
Bill Wendling1bf7a3f2012-01-10 08:46:39 +00002265 new llvm::GlobalVariable(getModule(), C->getType(), /*isConstant=*/true,
2266 Linkage, C, ".str");
Rafael Espindolab266a1f2011-01-17 16:31:00 +00002267 GV->setUnnamedAddr(true);
Daniel Dunbara9668e02009-04-03 00:57:44 +00002268 if (isUTF16) {
Ken Dyck4da244c2010-01-26 18:46:23 +00002269 CharUnits Align = getContext().getTypeAlignInChars(getContext().ShortTy);
2270 GV->setAlignment(Align.getQuantity());
Daniel Dunbarf7e903d2011-04-12 23:30:52 +00002271 } else {
2272 CharUnits Align = getContext().getTypeAlignInChars(getContext().CharTy);
2273 GV->setAlignment(Align.getQuantity());
Daniel Dunbara9668e02009-04-03 00:57:44 +00002274 }
Bill Wendling84392d02012-03-30 00:26:17 +00002275
2276 // String.
Jay Foada5c04342011-07-21 14:31:17 +00002277 Fields[2] = llvm::ConstantExpr::getGetElementPtr(GV, Zeros);
Anders Carlsson5add6832009-08-16 05:55:31 +00002278
Bill Wendling84392d02012-03-30 00:26:17 +00002279 if (isUTF16)
2280 // Cast the UTF16 string to the correct type.
2281 Fields[2] = llvm::ConstantExpr::getBitCast(Fields[2], Int8PtrTy);
2282
Anders Carlssonc9e20912007-08-21 00:21:21 +00002283 // String length.
2284 Ty = getTypes().ConvertType(getContext().LongTy);
Anders Carlsson5add6832009-08-16 05:55:31 +00002285 Fields[3] = llvm::ConstantInt::get(Ty, StringLength);
Mike Stump1eb44332009-09-09 15:08:12 +00002286
Anders Carlssonc9e20912007-08-21 00:21:21 +00002287 // The struct.
Owen Anderson08e25242009-07-27 22:29:56 +00002288 C = llvm::ConstantStruct::get(STy, Fields);
Mike Stump1eb44332009-09-09 15:08:12 +00002289 GV = new llvm::GlobalVariable(getModule(), C->getType(), true,
2290 llvm::GlobalVariable::PrivateLinkage, C,
Chris Lattner95b851e2009-07-16 05:03:48 +00002291 "_unnamed_cfstring_");
Douglas Gregorbcfd1f52011-09-02 00:18:52 +00002292 if (const char *Sect = getContext().getTargetInfo().getCFStringSection())
Daniel Dunbar8e5c2b82009-03-31 23:42:16 +00002293 GV->setSection(Sect);
Daniel Dunbar1d552912009-07-23 22:52:48 +00002294 Entry.setValue(GV);
Mike Stump1eb44332009-09-09 15:08:12 +00002295
Anders Carlsson0c678292007-11-01 00:41:52 +00002296 return GV;
Anders Carlssonc9e20912007-08-21 00:21:21 +00002297}
Chris Lattner45e8cbd2007-11-28 05:34:05 +00002298
Douglas Gregor45c4ea72011-08-09 15:54:21 +00002299static RecordDecl *
2300CreateRecordDecl(const ASTContext &Ctx, RecordDecl::TagKind TK,
2301 DeclContext *DC, IdentifierInfo *Id) {
2302 SourceLocation Loc;
David Blaikie4e4d0842012-03-11 07:00:24 +00002303 if (Ctx.getLangOpts().CPlusPlus)
Douglas Gregor45c4ea72011-08-09 15:54:21 +00002304 return CXXRecordDecl::Create(Ctx, TK, DC, Loc, Loc, Id);
2305 else
2306 return RecordDecl::Create(Ctx, TK, DC, Loc, Loc, Id);
2307}
2308
Fariborz Jahanian33e982b2010-04-22 20:26:39 +00002309llvm::Constant *
Fariborz Jahanian4c733072010-10-19 17:19:29 +00002310CodeGenModule::GetAddrOfConstantString(const StringLiteral *Literal) {
Fariborz Jahanian2bb5dda2010-04-23 17:41:07 +00002311 unsigned StringLength = 0;
Fariborz Jahanian2bb5dda2010-04-23 17:41:07 +00002312 llvm::StringMapEntry<llvm::Constant*> &Entry =
Fariborz Jahaniancf8e1682011-05-13 18:13:10 +00002313 GetConstantStringEntry(CFConstantStringMap, Literal, StringLength);
Fariborz Jahanian2bb5dda2010-04-23 17:41:07 +00002314
2315 if (llvm::Constant *C = Entry.getValue())
2316 return C;
2317
Chris Lattner812234b2012-02-06 22:47:00 +00002318 llvm::Constant *Zero = llvm::Constant::getNullValue(Int32Ty);
Fariborz Jahanian2bb5dda2010-04-23 17:41:07 +00002319 llvm::Constant *Zeros[] = { Zero, Zero };
2320
Fariborz Jahanianec951e02010-04-23 22:33:39 +00002321 // If we don't already have it, get _NSConstantStringClassReference.
Fariborz Jahanian4c733072010-10-19 17:19:29 +00002322 if (!ConstantStringClassRef) {
David Blaikie4e4d0842012-03-11 07:00:24 +00002323 std::string StringClass(getLangOpts().ObjCConstantStringClass);
Chris Lattner2acc6e32011-07-18 04:24:23 +00002324 llvm::Type *Ty = getTypes().ConvertType(getContext().IntTy);
Fariborz Jahanian4c733072010-10-19 17:19:29 +00002325 llvm::Constant *GV;
John McCall260611a2012-06-20 06:18:46 +00002326 if (LangOpts.ObjCRuntime.isNonFragile()) {
Fariborz Jahanian25dba5d2011-05-17 22:46:11 +00002327 std::string str =
2328 StringClass.empty() ? "OBJC_CLASS_$_NSConstantString"
2329 : "OBJC_CLASS_$_" + StringClass;
Fariborz Jahanian6f40e222011-05-17 22:21:16 +00002330 GV = getObjCRuntime().GetClassGlobal(str);
2331 // Make sure the result is of the correct type.
Chris Lattner2acc6e32011-07-18 04:24:23 +00002332 llvm::Type *PTy = llvm::PointerType::getUnqual(Ty);
Fariborz Jahanian6f40e222011-05-17 22:21:16 +00002333 ConstantStringClassRef =
2334 llvm::ConstantExpr::getBitCast(GV, PTy);
2335 } else {
Fariborz Jahanian25dba5d2011-05-17 22:46:11 +00002336 std::string str =
2337 StringClass.empty() ? "_NSConstantStringClassReference"
2338 : "_" + StringClass + "ClassReference";
Chris Lattner2acc6e32011-07-18 04:24:23 +00002339 llvm::Type *PTy = llvm::ArrayType::get(Ty, 0);
Fariborz Jahanian25dba5d2011-05-17 22:46:11 +00002340 GV = CreateRuntimeVariable(PTy, str);
Fariborz Jahanian6f40e222011-05-17 22:21:16 +00002341 // Decay array -> ptr
2342 ConstantStringClassRef =
Jay Foada5c04342011-07-21 14:31:17 +00002343 llvm::ConstantExpr::getGetElementPtr(GV, Zeros);
Fariborz Jahanian4c733072010-10-19 17:19:29 +00002344 }
Fariborz Jahanian2bb5dda2010-04-23 17:41:07 +00002345 }
Douglas Gregor45c4ea72011-08-09 15:54:21 +00002346
2347 if (!NSConstantStringType) {
2348 // Construct the type for a constant NSString.
2349 RecordDecl *D = CreateRecordDecl(Context, TTK_Struct,
2350 Context.getTranslationUnitDecl(),
2351 &Context.Idents.get("__builtin_NSString"));
2352 D->startDefinition();
2353
2354 QualType FieldTypes[3];
2355
2356 // const int *isa;
2357 FieldTypes[0] = Context.getPointerType(Context.IntTy.withConst());
2358 // const char *str;
2359 FieldTypes[1] = Context.getPointerType(Context.CharTy.withConst());
2360 // unsigned int length;
2361 FieldTypes[2] = Context.UnsignedIntTy;
2362
2363 // Create fields
2364 for (unsigned i = 0; i < 3; ++i) {
2365 FieldDecl *Field = FieldDecl::Create(Context, D,
2366 SourceLocation(),
2367 SourceLocation(), 0,
2368 FieldTypes[i], /*TInfo=*/0,
2369 /*BitWidth=*/0,
2370 /*Mutable=*/false,
Richard Smithca523302012-06-10 03:12:00 +00002371 ICIS_NoInit);
Douglas Gregor45c4ea72011-08-09 15:54:21 +00002372 Field->setAccess(AS_public);
2373 D->addDecl(Field);
2374 }
2375
2376 D->completeDefinition();
2377 QualType NSTy = Context.getTagDeclType(D);
2378 NSConstantStringType = cast<llvm::StructType>(getTypes().ConvertType(NSTy));
2379 }
Fariborz Jahanian2bb5dda2010-04-23 17:41:07 +00002380
Benjamin Kramer1d236ab2011-10-15 12:20:02 +00002381 llvm::Constant *Fields[3];
Fariborz Jahanian2bb5dda2010-04-23 17:41:07 +00002382
2383 // Class pointer.
Fariborz Jahanian4c733072010-10-19 17:19:29 +00002384 Fields[0] = ConstantStringClassRef;
Fariborz Jahanian2bb5dda2010-04-23 17:41:07 +00002385
2386 // String pointer.
Chris Lattner94010692012-02-05 02:30:40 +00002387 llvm::Constant *C =
2388 llvm::ConstantDataArray::getString(VMContext, Entry.getKey());
Fariborz Jahanian2bb5dda2010-04-23 17:41:07 +00002389
2390 llvm::GlobalValue::LinkageTypes Linkage;
2391 bool isConstant;
Fariborz Jahaniancf8e1682011-05-13 18:13:10 +00002392 Linkage = llvm::GlobalValue::PrivateLinkage;
David Blaikie4e4d0842012-03-11 07:00:24 +00002393 isConstant = !LangOpts.WritableStrings;
Fariborz Jahanian2bb5dda2010-04-23 17:41:07 +00002394
2395 llvm::GlobalVariable *GV =
2396 new llvm::GlobalVariable(getModule(), C->getType(), isConstant, Linkage, C,
2397 ".str");
Rafael Espindola803d3072011-01-17 22:11:21 +00002398 GV->setUnnamedAddr(true);
Fariborz Jahaniancf8e1682011-05-13 18:13:10 +00002399 CharUnits Align = getContext().getTypeAlignInChars(getContext().CharTy);
2400 GV->setAlignment(Align.getQuantity());
Jay Foada5c04342011-07-21 14:31:17 +00002401 Fields[1] = llvm::ConstantExpr::getGetElementPtr(GV, Zeros);
Fariborz Jahanian2bb5dda2010-04-23 17:41:07 +00002402
2403 // String length.
Chris Lattner2acc6e32011-07-18 04:24:23 +00002404 llvm::Type *Ty = getTypes().ConvertType(getContext().UnsignedIntTy);
Fariborz Jahanian2bb5dda2010-04-23 17:41:07 +00002405 Fields[2] = llvm::ConstantInt::get(Ty, StringLength);
2406
2407 // The struct.
Douglas Gregor45c4ea72011-08-09 15:54:21 +00002408 C = llvm::ConstantStruct::get(NSConstantStringType, Fields);
Fariborz Jahanian2bb5dda2010-04-23 17:41:07 +00002409 GV = new llvm::GlobalVariable(getModule(), C->getType(), true,
2410 llvm::GlobalVariable::PrivateLinkage, C,
2411 "_unnamed_nsstring_");
2412 // FIXME. Fix section.
Fariborz Jahanianec951e02010-04-23 22:33:39 +00002413 if (const char *Sect =
John McCall260611a2012-06-20 06:18:46 +00002414 LangOpts.ObjCRuntime.isNonFragile()
Douglas Gregorbcfd1f52011-09-02 00:18:52 +00002415 ? getContext().getTargetInfo().getNSStringNonFragileABISection()
2416 : getContext().getTargetInfo().getNSStringSection())
Fariborz Jahanian2bb5dda2010-04-23 17:41:07 +00002417 GV->setSection(Sect);
2418 Entry.setValue(GV);
2419
2420 return GV;
Fariborz Jahanian33e982b2010-04-22 20:26:39 +00002421}
2422
Douglas Gregor0815b572011-08-09 17:23:49 +00002423QualType CodeGenModule::getObjCFastEnumerationStateType() {
2424 if (ObjCFastEnumerationStateType.isNull()) {
2425 RecordDecl *D = CreateRecordDecl(Context, TTK_Struct,
2426 Context.getTranslationUnitDecl(),
2427 &Context.Idents.get("__objcFastEnumerationState"));
2428 D->startDefinition();
2429
2430 QualType FieldTypes[] = {
2431 Context.UnsignedLongTy,
2432 Context.getPointerType(Context.getObjCIdType()),
2433 Context.getPointerType(Context.UnsignedLongTy),
2434 Context.getConstantArrayType(Context.UnsignedLongTy,
2435 llvm::APInt(32, 5), ArrayType::Normal, 0)
2436 };
2437
2438 for (size_t i = 0; i < 4; ++i) {
2439 FieldDecl *Field = FieldDecl::Create(Context,
2440 D,
2441 SourceLocation(),
2442 SourceLocation(), 0,
2443 FieldTypes[i], /*TInfo=*/0,
2444 /*BitWidth=*/0,
2445 /*Mutable=*/false,
Richard Smithca523302012-06-10 03:12:00 +00002446 ICIS_NoInit);
Douglas Gregor0815b572011-08-09 17:23:49 +00002447 Field->setAccess(AS_public);
2448 D->addDecl(Field);
2449 }
2450
2451 D->completeDefinition();
2452 ObjCFastEnumerationStateType = Context.getTagDeclType(D);
2453 }
2454
2455 return ObjCFastEnumerationStateType;
2456}
2457
Eli Friedman64f45a22011-11-01 02:23:42 +00002458llvm::Constant *
2459CodeGenModule::GetConstantArrayFromStringLiteral(const StringLiteral *E) {
2460 assert(!E->getType()->isPointerType() && "Strings are always arrays");
2461
2462 // Don't emit it as the address of the string, emit the string data itself
2463 // as an inline array.
Chris Lattner812234b2012-02-06 22:47:00 +00002464 if (E->getCharByteWidth() == 1) {
2465 SmallString<64> Str(E->getString());
2466
2467 // Resize the string to the right size, which is indicated by its type.
2468 const ConstantArrayType *CAT = Context.getAsConstantArrayType(E->getType());
2469 Str.resize(CAT->getSize().getZExtValue());
2470 return llvm::ConstantDataArray::getString(VMContext, Str, false);
2471 }
Chris Lattner94010692012-02-05 02:30:40 +00002472
2473 llvm::ArrayType *AType =
2474 cast<llvm::ArrayType>(getTypes().ConvertType(E->getType()));
2475 llvm::Type *ElemTy = AType->getElementType();
2476 unsigned NumElements = AType->getNumElements();
Chris Lattnerd79ed432012-02-06 22:52:04 +00002477
2478 // Wide strings have either 2-byte or 4-byte elements.
2479 if (ElemTy->getPrimitiveSizeInBits() == 16) {
2480 SmallVector<uint16_t, 32> Elements;
2481 Elements.reserve(NumElements);
2482
2483 for(unsigned i = 0, e = E->getLength(); i != e; ++i)
2484 Elements.push_back(E->getCodeUnit(i));
2485 Elements.resize(NumElements);
2486 return llvm::ConstantDataArray::get(VMContext, Elements);
Chris Lattner94010692012-02-05 02:30:40 +00002487 }
2488
Chris Lattnerd79ed432012-02-06 22:52:04 +00002489 assert(ElemTy->getPrimitiveSizeInBits() == 32);
2490 SmallVector<uint32_t, 32> Elements;
2491 Elements.reserve(NumElements);
2492
2493 for(unsigned i = 0, e = E->getLength(); i != e; ++i)
2494 Elements.push_back(E->getCodeUnit(i));
2495 Elements.resize(NumElements);
2496 return llvm::ConstantDataArray::get(VMContext, Elements);
Eli Friedman64f45a22011-11-01 02:23:42 +00002497}
2498
Daniel Dunbar61432932008-08-13 23:20:05 +00002499/// GetAddrOfConstantStringFromLiteral - Return a pointer to a
2500/// constant array for the given string literal.
2501llvm::Constant *
2502CodeGenModule::GetAddrOfConstantStringFromLiteral(const StringLiteral *S) {
John McCalla5e19c62011-08-04 01:03:22 +00002503 CharUnits Align = getContext().getTypeAlignInChars(S->getType());
Eli Friedman64f45a22011-11-01 02:23:42 +00002504 if (S->isAscii() || S->isUTF8()) {
Chris Lattner812234b2012-02-06 22:47:00 +00002505 SmallString<64> Str(S->getString());
2506
2507 // Resize the string to the right size, which is indicated by its type.
2508 const ConstantArrayType *CAT = Context.getAsConstantArrayType(S->getType());
2509 Str.resize(CAT->getSize().getZExtValue());
2510 return GetAddrOfConstantString(Str, /*GlobalName*/ 0, Align.getQuantity());
Eli Friedman7eb79c12009-11-16 05:55:46 +00002511 }
Eli Friedman64f45a22011-11-01 02:23:42 +00002512
Chris Lattner812234b2012-02-06 22:47:00 +00002513 // FIXME: the following does not memoize wide strings.
Eli Friedman64f45a22011-11-01 02:23:42 +00002514 llvm::Constant *C = GetConstantArrayFromStringLiteral(S);
2515 llvm::GlobalVariable *GV =
2516 new llvm::GlobalVariable(getModule(),C->getType(),
David Blaikie4e4d0842012-03-11 07:00:24 +00002517 !LangOpts.WritableStrings,
Eli Friedman64f45a22011-11-01 02:23:42 +00002518 llvm::GlobalValue::PrivateLinkage,
2519 C,".str");
Seth Cantrell7d6a7c02012-01-18 12:11:32 +00002520
Eli Friedman64f45a22011-11-01 02:23:42 +00002521 GV->setAlignment(Align.getQuantity());
2522 GV->setUnnamedAddr(true);
Eli Friedman64f45a22011-11-01 02:23:42 +00002523 return GV;
Daniel Dunbar61432932008-08-13 23:20:05 +00002524}
2525
Chris Lattnereaf2bb82009-02-24 22:18:39 +00002526/// GetAddrOfConstantStringFromObjCEncode - Return a pointer to a constant
2527/// array for the given ObjCEncodeExpr node.
2528llvm::Constant *
2529CodeGenModule::GetAddrOfConstantStringFromObjCEncode(const ObjCEncodeExpr *E) {
2530 std::string Str;
2531 getContext().getObjCEncodingForType(E->getEncodedType(), Str);
Eli Friedmana210f352009-03-07 20:17:55 +00002532
2533 return GetAddrOfConstantCString(Str);
Chris Lattnereaf2bb82009-02-24 22:18:39 +00002534}
2535
2536
Chris Lattnera7ad98f2008-02-11 00:02:17 +00002537/// GenerateWritableString -- Creates storage for a string literal.
John McCalla5e19c62011-08-04 01:03:22 +00002538static llvm::GlobalVariable *GenerateStringLiteral(StringRef str,
Chris Lattner45e8cbd2007-11-28 05:34:05 +00002539 bool constant,
Daniel Dunbar5fabf9d2008-10-17 21:56:50 +00002540 CodeGenModule &CGM,
John McCalla5e19c62011-08-04 01:03:22 +00002541 const char *GlobalName,
2542 unsigned Alignment) {
Daniel Dunbar61432932008-08-13 23:20:05 +00002543 // Create Constant for this string literal. Don't add a '\0'.
Owen Anderson0032b272009-08-13 21:57:51 +00002544 llvm::Constant *C =
Chris Lattner94010692012-02-05 02:30:40 +00002545 llvm::ConstantDataArray::getString(CGM.getLLVMContext(), str, false);
Mike Stump1eb44332009-09-09 15:08:12 +00002546
Chris Lattner45e8cbd2007-11-28 05:34:05 +00002547 // Create a global variable for this string
Rafael Espindola1257bc62011-01-10 22:34:03 +00002548 llvm::GlobalVariable *GV =
2549 new llvm::GlobalVariable(CGM.getModule(), C->getType(), constant,
2550 llvm::GlobalValue::PrivateLinkage,
2551 C, GlobalName);
John McCalla5e19c62011-08-04 01:03:22 +00002552 GV->setAlignment(Alignment);
Rafael Espindola1257bc62011-01-10 22:34:03 +00002553 GV->setUnnamedAddr(true);
2554 return GV;
Chris Lattner45e8cbd2007-11-28 05:34:05 +00002555}
2556
Daniel Dunbar61432932008-08-13 23:20:05 +00002557/// GetAddrOfConstantString - Returns a pointer to a character array
2558/// containing the literal. This contents are exactly that of the
2559/// given string, i.e. it will not be null terminated automatically;
2560/// see GetAddrOfConstantCString. Note that whether the result is
2561/// actually a pointer to an LLVM constant depends on
2562/// Feature.WriteableStrings.
2563///
2564/// The result has pointer to array type.
Chris Lattner5f9e2722011-07-23 10:55:15 +00002565llvm::Constant *CodeGenModule::GetAddrOfConstantString(StringRef Str,
John McCalla5e19c62011-08-04 01:03:22 +00002566 const char *GlobalName,
2567 unsigned Alignment) {
Daniel Dunbar8e5c2b82009-03-31 23:42:16 +00002568 // Get the default prefix if a name wasn't specified.
2569 if (!GlobalName)
Chris Lattner95b851e2009-07-16 05:03:48 +00002570 GlobalName = ".str";
Daniel Dunbar8e5c2b82009-03-31 23:42:16 +00002571
2572 // Don't share any string literals if strings aren't constant.
David Blaikie4e4d0842012-03-11 07:00:24 +00002573 if (LangOpts.WritableStrings)
John McCalla5e19c62011-08-04 01:03:22 +00002574 return GenerateStringLiteral(Str, false, *this, GlobalName, Alignment);
Mike Stump1eb44332009-09-09 15:08:12 +00002575
John McCalla5e19c62011-08-04 01:03:22 +00002576 llvm::StringMapEntry<llvm::GlobalVariable *> &Entry =
Benjamin Kramer9de43422011-03-05 13:45:23 +00002577 ConstantStringMap.GetOrCreateValue(Str);
Chris Lattner45e8cbd2007-11-28 05:34:05 +00002578
John McCalla5e19c62011-08-04 01:03:22 +00002579 if (llvm::GlobalVariable *GV = Entry.getValue()) {
2580 if (Alignment > GV->getAlignment()) {
2581 GV->setAlignment(Alignment);
2582 }
2583 return GV;
2584 }
Chris Lattner45e8cbd2007-11-28 05:34:05 +00002585
2586 // Create a global variable for this.
Chris Lattner812234b2012-02-06 22:47:00 +00002587 llvm::GlobalVariable *GV = GenerateStringLiteral(Str, true, *this, GlobalName,
2588 Alignment);
John McCalla5e19c62011-08-04 01:03:22 +00002589 Entry.setValue(GV);
2590 return GV;
Chris Lattner45e8cbd2007-11-28 05:34:05 +00002591}
Daniel Dunbar61432932008-08-13 23:20:05 +00002592
2593/// GetAddrOfConstantCString - Returns a pointer to a character
Benjamin Kramer9de43422011-03-05 13:45:23 +00002594/// array containing the literal and a terminating '\0'
Daniel Dunbar61432932008-08-13 23:20:05 +00002595/// character. The result has pointer to array type.
Benjamin Kramer9de43422011-03-05 13:45:23 +00002596llvm::Constant *CodeGenModule::GetAddrOfConstantCString(const std::string &Str,
John McCalla5e19c62011-08-04 01:03:22 +00002597 const char *GlobalName,
2598 unsigned Alignment) {
Chris Lattner5f9e2722011-07-23 10:55:15 +00002599 StringRef StrWithNull(Str.c_str(), Str.size() + 1);
John McCalla5e19c62011-08-04 01:03:22 +00002600 return GetAddrOfConstantString(StrWithNull, GlobalName, Alignment);
Daniel Dunbar61432932008-08-13 23:20:05 +00002601}
Daniel Dunbar41071de2008-08-15 23:26:23 +00002602
Daniel Dunbaraf05bb92008-08-26 08:29:31 +00002603/// EmitObjCPropertyImplementations - Emit information for synthesized
2604/// properties for an implementation.
Mike Stump1eb44332009-09-09 15:08:12 +00002605void CodeGenModule::EmitObjCPropertyImplementations(const
Daniel Dunbaraf05bb92008-08-26 08:29:31 +00002606 ObjCImplementationDecl *D) {
Mike Stump1eb44332009-09-09 15:08:12 +00002607 for (ObjCImplementationDecl::propimpl_iterator
Argyrios Kyrtzidis17945a02009-06-30 02:36:12 +00002608 i = D->propimpl_begin(), e = D->propimpl_end(); i != e; ++i) {
David Blaikie581deb32012-06-06 20:45:41 +00002609 ObjCPropertyImplDecl *PID = *i;
Mike Stump1eb44332009-09-09 15:08:12 +00002610
Daniel Dunbaraf05bb92008-08-26 08:29:31 +00002611 // Dynamic is just for type-checking.
2612 if (PID->getPropertyImplementation() == ObjCPropertyImplDecl::Synthesize) {
2613 ObjCPropertyDecl *PD = PID->getPropertyDecl();
2614
2615 // Determine which methods need to be implemented, some may have
Jordan Rose1e4691b2012-10-10 16:42:25 +00002616 // been overridden. Note that ::isPropertyAccessor is not the method
Daniel Dunbaraf05bb92008-08-26 08:29:31 +00002617 // we want, that just indicates if the decl came from a
2618 // property. What we want to know is if the method is defined in
2619 // this implementation.
Argyrios Kyrtzidis17945a02009-06-30 02:36:12 +00002620 if (!D->getInstanceMethod(PD->getGetterName()))
Fariborz Jahanianfef30b52008-12-09 20:23:04 +00002621 CodeGenFunction(*this).GenerateObjCGetter(
2622 const_cast<ObjCImplementationDecl *>(D), PID);
Daniel Dunbaraf05bb92008-08-26 08:29:31 +00002623 if (!PD->isReadOnly() &&
Argyrios Kyrtzidis17945a02009-06-30 02:36:12 +00002624 !D->getInstanceMethod(PD->getSetterName()))
Fariborz Jahanianfef30b52008-12-09 20:23:04 +00002625 CodeGenFunction(*this).GenerateObjCSetter(
2626 const_cast<ObjCImplementationDecl *>(D), PID);
Daniel Dunbaraf05bb92008-08-26 08:29:31 +00002627 }
2628 }
2629}
2630
John McCalle81ac692011-03-22 07:05:39 +00002631static bool needsDestructMethod(ObjCImplementationDecl *impl) {
Jordy Rosedb8264e2011-07-22 02:08:32 +00002632 const ObjCInterfaceDecl *iface = impl->getClassInterface();
2633 for (const ObjCIvarDecl *ivar = iface->all_declared_ivar_begin();
John McCalle81ac692011-03-22 07:05:39 +00002634 ivar; ivar = ivar->getNextIvar())
2635 if (ivar->getType().isDestructedType())
2636 return true;
2637
2638 return false;
2639}
2640
Fariborz Jahanian109dfc62010-04-28 21:28:56 +00002641/// EmitObjCIvarInitializations - Emit information for ivar initialization
2642/// for an implementation.
2643void CodeGenModule::EmitObjCIvarInitializations(ObjCImplementationDecl *D) {
John McCalle81ac692011-03-22 07:05:39 +00002644 // We might need a .cxx_destruct even if we don't have any ivar initializers.
2645 if (needsDestructMethod(D)) {
2646 IdentifierInfo *II = &getContext().Idents.get(".cxx_destruct");
2647 Selector cxxSelector = getContext().Selectors.getSelector(0, &II);
2648 ObjCMethodDecl *DTORMethod =
2649 ObjCMethodDecl::Create(getContext(), D->getLocation(), D->getLocation(),
Argyrios Kyrtzidis75cf3e82011-08-17 19:25:08 +00002650 cxxSelector, getContext().VoidTy, 0, D,
2651 /*isInstance=*/true, /*isVariadic=*/false,
Jordan Rose1e4691b2012-10-10 16:42:25 +00002652 /*isPropertyAccessor=*/true, /*isImplicitlyDeclared=*/true,
Argyrios Kyrtzidis75cf3e82011-08-17 19:25:08 +00002653 /*isDefined=*/false, ObjCMethodDecl::Required);
John McCalle81ac692011-03-22 07:05:39 +00002654 D->addInstanceMethod(DTORMethod);
2655 CodeGenFunction(*this).GenerateObjCCtorDtorMethod(D, DTORMethod, false);
John McCallb03527a2012-10-17 04:53:31 +00002656 D->setHasDestructors(true);
John McCalle81ac692011-03-22 07:05:39 +00002657 }
2658
2659 // If the implementation doesn't have any ivar initializers, we don't need
2660 // a .cxx_construct.
David Chisnall827bbcc2011-03-17 14:19:08 +00002661 if (D->getNumIvarInitializers() == 0)
Fariborz Jahanian109dfc62010-04-28 21:28:56 +00002662 return;
Fariborz Jahanian109dfc62010-04-28 21:28:56 +00002663
John McCalle81ac692011-03-22 07:05:39 +00002664 IdentifierInfo *II = &getContext().Idents.get(".cxx_construct");
2665 Selector cxxSelector = getContext().Selectors.getSelector(0, &II);
Fariborz Jahanian109dfc62010-04-28 21:28:56 +00002666 // The constructor returns 'self'.
2667 ObjCMethodDecl *CTORMethod = ObjCMethodDecl::Create(getContext(),
2668 D->getLocation(),
Argyrios Kyrtzidis11d77162011-10-03 06:36:36 +00002669 D->getLocation(),
Argyrios Kyrtzidis11d77162011-10-03 06:36:36 +00002670 cxxSelector,
Fariborz Jahanian109dfc62010-04-28 21:28:56 +00002671 getContext().getObjCIdType(), 0,
Argyrios Kyrtzidis75cf3e82011-08-17 19:25:08 +00002672 D, /*isInstance=*/true,
2673 /*isVariadic=*/false,
Jordan Rose1e4691b2012-10-10 16:42:25 +00002674 /*isPropertyAccessor=*/true,
Argyrios Kyrtzidis75cf3e82011-08-17 19:25:08 +00002675 /*isImplicitlyDeclared=*/true,
2676 /*isDefined=*/false,
Fariborz Jahanian109dfc62010-04-28 21:28:56 +00002677 ObjCMethodDecl::Required);
2678 D->addInstanceMethod(CTORMethod);
2679 CodeGenFunction(*this).GenerateObjCCtorDtorMethod(D, CTORMethod, true);
John McCallb03527a2012-10-17 04:53:31 +00002680 D->setHasNonZeroConstructors(true);
Fariborz Jahanian109dfc62010-04-28 21:28:56 +00002681}
2682
Anders Carlsson91e20dd2009-04-02 05:55:18 +00002683/// EmitNamespace - Emit all declarations in a namespace.
Anders Carlsson984e0682009-04-01 00:58:25 +00002684void CodeGenModule::EmitNamespace(const NamespaceDecl *ND) {
Argyrios Kyrtzidis17945a02009-06-30 02:36:12 +00002685 for (RecordDecl::decl_iterator I = ND->decls_begin(), E = ND->decls_end();
Anders Carlsson984e0682009-04-01 00:58:25 +00002686 I != E; ++I)
2687 EmitTopLevelDecl(*I);
2688}
2689
Anders Carlsson91e20dd2009-04-02 05:55:18 +00002690// EmitLinkageSpec - Emit all declarations in a linkage spec.
2691void CodeGenModule::EmitLinkageSpec(const LinkageSpecDecl *LSD) {
Eli Friedmanf976be82009-08-01 20:48:04 +00002692 if (LSD->getLanguage() != LinkageSpecDecl::lang_c &&
2693 LSD->getLanguage() != LinkageSpecDecl::lang_cxx) {
Anders Carlsson91e20dd2009-04-02 05:55:18 +00002694 ErrorUnsupported(LSD, "linkage spec");
2695 return;
2696 }
2697
Argyrios Kyrtzidis17945a02009-06-30 02:36:12 +00002698 for (RecordDecl::decl_iterator I = LSD->decls_begin(), E = LSD->decls_end();
Fariborz Jahanianc1868e52012-10-26 20:22:11 +00002699 I != E; ++I) {
Fariborz Jahanian107dae42012-10-26 22:20:25 +00002700 // Meta-data for ObjC class includes references to implemented methods.
2701 // Generate class's method definitions first.
Fariborz Jahanianc1868e52012-10-26 20:22:11 +00002702 if (ObjCImplDecl *OID = dyn_cast<ObjCImplDecl>(*I)) {
2703 for (ObjCContainerDecl::method_iterator M = OID->meth_begin(),
2704 MEnd = OID->meth_end();
2705 M != MEnd; ++M)
2706 EmitTopLevelDecl(*M);
2707 }
Anders Carlsson91e20dd2009-04-02 05:55:18 +00002708 EmitTopLevelDecl(*I);
Fariborz Jahanianc1868e52012-10-26 20:22:11 +00002709 }
Anders Carlsson91e20dd2009-04-02 05:55:18 +00002710}
2711
Daniel Dunbar41071de2008-08-15 23:26:23 +00002712/// EmitTopLevelDecl - Emit code for a single top level declaration.
2713void CodeGenModule::EmitTopLevelDecl(Decl *D) {
2714 // If an error has occurred, stop code generation, but continue
2715 // parsing and semantic analysis (to ensure all warnings and errors
2716 // are emitted).
2717 if (Diags.hasErrorOccurred())
2718 return;
2719
Douglas Gregor16e8be22009-06-29 17:30:29 +00002720 // Ignore dependent declarations.
2721 if (D->getDeclContext() && D->getDeclContext()->isDependentContext())
2722 return;
Mike Stump1eb44332009-09-09 15:08:12 +00002723
Daniel Dunbar41071de2008-08-15 23:26:23 +00002724 switch (D->getKind()) {
Anders Carlsson293361a2009-08-25 13:14:46 +00002725 case Decl::CXXConversion:
Anders Carlsson2b77ba82009-04-04 20:47:02 +00002726 case Decl::CXXMethod:
Daniel Dunbar41071de2008-08-15 23:26:23 +00002727 case Decl::Function:
Douglas Gregor16e8be22009-06-29 17:30:29 +00002728 // Skip function templates
Francois Pichet8387e2a2011-04-22 22:18:13 +00002729 if (cast<FunctionDecl>(D)->getDescribedFunctionTemplate() ||
2730 cast<FunctionDecl>(D)->isLateTemplateParsed())
Douglas Gregor16e8be22009-06-29 17:30:29 +00002731 return;
Mike Stump1eb44332009-09-09 15:08:12 +00002732
Anders Carlsson555b4bb2009-09-10 23:43:36 +00002733 EmitGlobal(cast<FunctionDecl>(D));
2734 break;
2735
Daniel Dunbar41071de2008-08-15 23:26:23 +00002736 case Decl::Var:
Anders Carlsson555b4bb2009-09-10 23:43:36 +00002737 EmitGlobal(cast<VarDecl>(D));
Daniel Dunbar41071de2008-08-15 23:26:23 +00002738 break;
2739
John McCall26fbc722011-04-12 01:01:22 +00002740 // Indirect fields from global anonymous structs and unions can be
2741 // ignored; only the actual variable requires IR gen support.
2742 case Decl::IndirectField:
2743 break;
2744
Anders Carlsson95d4e5d2009-04-15 15:55:24 +00002745 // C++ Decls
Daniel Dunbar41071de2008-08-15 23:26:23 +00002746 case Decl::Namespace:
Anders Carlsson984e0682009-04-01 00:58:25 +00002747 EmitNamespace(cast<NamespaceDecl>(D));
Daniel Dunbar41071de2008-08-15 23:26:23 +00002748 break;
Douglas Gregor9cfbe482009-06-20 00:51:54 +00002749 // No code generation needed.
John McCall9d0c6612009-11-17 09:33:40 +00002750 case Decl::UsingShadow:
Douglas Gregor9cfbe482009-06-20 00:51:54 +00002751 case Decl::Using:
Douglas Gregordd9967a2009-09-02 23:49:23 +00002752 case Decl::UsingDirective:
Douglas Gregor127102b2009-06-29 20:59:39 +00002753 case Decl::ClassTemplate:
2754 case Decl::FunctionTemplate:
Richard Smith3e4c6c42011-05-05 21:57:07 +00002755 case Decl::TypeAliasTemplate:
Anders Carlsson018837b2009-09-23 19:19:16 +00002756 case Decl::NamespaceAlias:
Douglas Gregor6a576ab2011-06-05 05:04:23 +00002757 case Decl::Block:
Michael Han684aa732013-02-22 17:15:32 +00002758 case Decl::Empty:
Douglas Gregor9cfbe482009-06-20 00:51:54 +00002759 break;
Anders Carlsson95d4e5d2009-04-15 15:55:24 +00002760 case Decl::CXXConstructor:
Anders Carlsson1fe598c2009-11-24 05:16:24 +00002761 // Skip function templates
Francois Pichet8387e2a2011-04-22 22:18:13 +00002762 if (cast<FunctionDecl>(D)->getDescribedFunctionTemplate() ||
2763 cast<FunctionDecl>(D)->isLateTemplateParsed())
Anders Carlsson1fe598c2009-11-24 05:16:24 +00002764 return;
2765
Anders Carlsson95d4e5d2009-04-15 15:55:24 +00002766 EmitCXXConstructors(cast<CXXConstructorDecl>(D));
2767 break;
Anders Carlsson27ae5362009-04-17 01:58:57 +00002768 case Decl::CXXDestructor:
Francois Pichet8387e2a2011-04-22 22:18:13 +00002769 if (cast<FunctionDecl>(D)->isLateTemplateParsed())
2770 return;
Anders Carlsson27ae5362009-04-17 01:58:57 +00002771 EmitCXXDestructors(cast<CXXDestructorDecl>(D));
2772 break;
Anders Carlsson36674d22009-06-11 21:22:55 +00002773
2774 case Decl::StaticAssert:
2775 // Nothing to do.
2776 break;
2777
Anders Carlsson95d4e5d2009-04-15 15:55:24 +00002778 // Objective-C Decls
Mike Stump1eb44332009-09-09 15:08:12 +00002779
Fariborz Jahanian38e24c72009-03-18 22:33:24 +00002780 // Forward declarations, no (immediate) code generation.
Chris Lattner285d0db2009-04-01 02:36:43 +00002781 case Decl::ObjCInterface:
Eric Christopherffb0c3a2012-07-19 22:22:55 +00002782 case Decl::ObjCCategory:
Chris Lattner285d0db2009-04-01 02:36:43 +00002783 break;
2784
Douglas Gregorbd9482d2012-01-01 21:23:57 +00002785 case Decl::ObjCProtocol: {
2786 ObjCProtocolDecl *Proto = cast<ObjCProtocolDecl>(D);
2787 if (Proto->isThisDeclarationADefinition())
2788 ObjCRuntime->GenerateProtocol(Proto);
Daniel Dunbar41071de2008-08-15 23:26:23 +00002789 break;
Douglas Gregorbd9482d2012-01-01 21:23:57 +00002790 }
2791
Daniel Dunbar41071de2008-08-15 23:26:23 +00002792 case Decl::ObjCCategoryImpl:
Daniel Dunbaraf05bb92008-08-26 08:29:31 +00002793 // Categories have properties but don't support synthesize so we
2794 // can ignore them here.
Peter Collingbournee9265232011-07-27 20:29:46 +00002795 ObjCRuntime->GenerateCategory(cast<ObjCCategoryImplDecl>(D));
Daniel Dunbar41071de2008-08-15 23:26:23 +00002796 break;
2797
Daniel Dunbaraf05bb92008-08-26 08:29:31 +00002798 case Decl::ObjCImplementation: {
2799 ObjCImplementationDecl *OMD = cast<ObjCImplementationDecl>(D);
2800 EmitObjCPropertyImplementations(OMD);
Fariborz Jahanian109dfc62010-04-28 21:28:56 +00002801 EmitObjCIvarInitializations(OMD);
Peter Collingbournee9265232011-07-27 20:29:46 +00002802 ObjCRuntime->GenerateClass(OMD);
Eric Christopherbe6c6862012-04-11 05:56:05 +00002803 // Emit global variable debug information.
2804 if (CGDebugInfo *DI = getModuleDebugInfo())
Alexey Samsonov96a66392012-12-03 18:28:12 +00002805 if (getCodeGenOpts().getDebugInfo() >= CodeGenOptions::LimitedDebugInfo)
2806 DI->getOrCreateInterfaceType(getContext().getObjCInterfaceType(
2807 OMD->getClassInterface()), OMD->getLocation());
Daniel Dunbar41071de2008-08-15 23:26:23 +00002808 break;
Mike Stump1eb44332009-09-09 15:08:12 +00002809 }
Daniel Dunbar41071de2008-08-15 23:26:23 +00002810 case Decl::ObjCMethod: {
2811 ObjCMethodDecl *OMD = cast<ObjCMethodDecl>(D);
2812 // If this is not a prototype, emit the body.
Argyrios Kyrtzidis6fb0aee2009-06-30 02:35:26 +00002813 if (OMD->getBody())
Daniel Dunbar41071de2008-08-15 23:26:23 +00002814 CodeGenFunction(*this).GenerateObjCMethod(OMD);
2815 break;
2816 }
Mike Stump1eb44332009-09-09 15:08:12 +00002817 case Decl::ObjCCompatibleAlias:
David Chisnall29254f42012-01-31 18:59:20 +00002818 ObjCRuntime->RegisterAlias(cast<ObjCCompatibleAliasDecl>(D));
Daniel Dunbar41071de2008-08-15 23:26:23 +00002819 break;
2820
Anders Carlsson91e20dd2009-04-02 05:55:18 +00002821 case Decl::LinkageSpec:
2822 EmitLinkageSpec(cast<LinkageSpecDecl>(D));
Daniel Dunbar41071de2008-08-15 23:26:23 +00002823 break;
Daniel Dunbar41071de2008-08-15 23:26:23 +00002824
2825 case Decl::FileScopeAsm: {
2826 FileScopeAsmDecl *AD = cast<FileScopeAsmDecl>(D);
Chris Lattner5f9e2722011-07-23 10:55:15 +00002827 StringRef AsmString = AD->getAsmString()->getString();
Mike Stump1eb44332009-09-09 15:08:12 +00002828
Daniel Dunbar41071de2008-08-15 23:26:23 +00002829 const std::string &S = getModule().getModuleInlineAsm();
2830 if (S.empty())
2831 getModule().setModuleInlineAsm(AsmString);
Joerg Sonnenberger8ce9cca2012-08-10 10:57:52 +00002832 else if (S.end()[-1] == '\n')
Chris Lattner9f5bff02011-07-23 20:04:25 +00002833 getModule().setModuleInlineAsm(S + AsmString.str());
Daniel Dunbar41071de2008-08-15 23:26:23 +00002834 else
Benjamin Kramer8d042582009-12-11 13:33:18 +00002835 getModule().setModuleInlineAsm(S + '\n' + AsmString.str());
Daniel Dunbar41071de2008-08-15 23:26:23 +00002836 break;
2837 }
Mike Stump1eb44332009-09-09 15:08:12 +00002838
Douglas Gregorb6cbe512013-01-14 17:21:00 +00002839 case Decl::Import: {
2840 ImportDecl *Import = cast<ImportDecl>(D);
2841
2842 // Ignore import declarations that come from imported modules.
2843 if (clang::Module *Owner = Import->getOwningModule()) {
2844 if (getLangOpts().CurrentModule.empty() ||
2845 Owner->getTopLevelModule()->Name == getLangOpts().CurrentModule)
2846 break;
2847 }
2848
Douglas Gregor858afb32013-01-14 20:53:57 +00002849 ImportedModules.insert(Import->getImportedModule());
Douglas Gregorb6cbe512013-01-14 17:21:00 +00002850 break;
2851 }
2852
Mike Stump1eb44332009-09-09 15:08:12 +00002853 default:
Mike Stumpf5408fe2009-05-16 07:57:57 +00002854 // Make sure we handled everything we should, every other kind is a
2855 // non-top-level decl. FIXME: Would be nice to have an isTopLevelDeclKind
2856 // function. Need to recode Decl::Kind to do that easily.
Daniel Dunbar41071de2008-08-15 23:26:23 +00002857 assert(isa<TypeDecl>(D) && "Unsupported decl kind");
2858 }
2859}
John McCall744016d2010-07-06 23:57:41 +00002860
2861/// Turns the given pointer into a constant.
2862static llvm::Constant *GetPointerConstant(llvm::LLVMContext &Context,
2863 const void *Ptr) {
2864 uintptr_t PtrInt = reinterpret_cast<uintptr_t>(Ptr);
Chris Lattner2acc6e32011-07-18 04:24:23 +00002865 llvm::Type *i64 = llvm::Type::getInt64Ty(Context);
John McCall744016d2010-07-06 23:57:41 +00002866 return llvm::ConstantInt::get(i64, PtrInt);
2867}
2868
2869static void EmitGlobalDeclMetadata(CodeGenModule &CGM,
2870 llvm::NamedMDNode *&GlobalMetadata,
2871 GlobalDecl D,
2872 llvm::GlobalValue *Addr) {
2873 if (!GlobalMetadata)
2874 GlobalMetadata =
2875 CGM.getModule().getOrInsertNamedMetadata("clang.global.decl.ptrs");
2876
2877 // TODO: should we report variant information for ctors/dtors?
2878 llvm::Value *Ops[] = {
2879 Addr,
2880 GetPointerConstant(CGM.getLLVMContext(), D.getDecl())
2881 };
Jay Foad6f141652011-04-21 19:59:12 +00002882 GlobalMetadata->addOperand(llvm::MDNode::get(CGM.getLLVMContext(), Ops));
John McCall744016d2010-07-06 23:57:41 +00002883}
2884
2885/// Emits metadata nodes associating all the global values in the
2886/// current module with the Decls they came from. This is useful for
2887/// projects using IR gen as a subroutine.
2888///
2889/// Since there's currently no way to associate an MDNode directly
2890/// with an llvm::GlobalValue, we create a global named metadata
2891/// with the name 'clang.global.decl.ptrs'.
2892void CodeGenModule::EmitDeclMetadata() {
2893 llvm::NamedMDNode *GlobalMetadata = 0;
2894
2895 // StaticLocalDeclMap
Chris Lattner5f9e2722011-07-23 10:55:15 +00002896 for (llvm::DenseMap<GlobalDecl,StringRef>::iterator
John McCall744016d2010-07-06 23:57:41 +00002897 I = MangledDeclNames.begin(), E = MangledDeclNames.end();
2898 I != E; ++I) {
2899 llvm::GlobalValue *Addr = getModule().getNamedValue(I->second);
2900 EmitGlobalDeclMetadata(*this, GlobalMetadata, I->first, Addr);
2901 }
2902}
2903
2904/// Emits metadata nodes for all the local variables in the current
2905/// function.
2906void CodeGenFunction::EmitDeclMetadata() {
2907 if (LocalDeclMap.empty()) return;
2908
2909 llvm::LLVMContext &Context = getLLVMContext();
2910
2911 // Find the unique metadata ID for this name.
2912 unsigned DeclPtrKind = Context.getMDKindID("clang.decl.ptr");
2913
2914 llvm::NamedMDNode *GlobalMetadata = 0;
2915
2916 for (llvm::DenseMap<const Decl*, llvm::Value*>::iterator
2917 I = LocalDeclMap.begin(), E = LocalDeclMap.end(); I != E; ++I) {
2918 const Decl *D = I->first;
2919 llvm::Value *Addr = I->second;
2920
2921 if (llvm::AllocaInst *Alloca = dyn_cast<llvm::AllocaInst>(Addr)) {
2922 llvm::Value *DAddr = GetPointerConstant(getLLVMContext(), D);
Jay Foad6f141652011-04-21 19:59:12 +00002923 Alloca->setMetadata(DeclPtrKind, llvm::MDNode::get(Context, DAddr));
John McCall744016d2010-07-06 23:57:41 +00002924 } else if (llvm::GlobalValue *GV = dyn_cast<llvm::GlobalValue>(Addr)) {
2925 GlobalDecl GD = GlobalDecl(cast<VarDecl>(D));
2926 EmitGlobalDeclMetadata(CGM, GlobalMetadata, GD, GV);
2927 }
2928 }
2929}
Daniel Dunbar673431a2010-07-16 00:00:15 +00002930
Nick Lewycky3dc05412011-05-05 00:08:20 +00002931void CodeGenModule::EmitCoverageFile() {
2932 if (!getCodeGenOpts().CoverageFile.empty()) {
Nick Lewycky5ea4f442011-05-04 20:46:58 +00002933 if (llvm::NamedMDNode *CUNode = TheModule.getNamedMetadata("llvm.dbg.cu")) {
2934 llvm::NamedMDNode *GCov = TheModule.getOrInsertNamedMetadata("llvm.gcov");
2935 llvm::LLVMContext &Ctx = TheModule.getContext();
Nick Lewycky3dc05412011-05-05 00:08:20 +00002936 llvm::MDString *CoverageFile =
2937 llvm::MDString::get(Ctx, getCodeGenOpts().CoverageFile);
Nick Lewycky5ea4f442011-05-04 20:46:58 +00002938 for (int i = 0, e = CUNode->getNumOperands(); i != e; ++i) {
2939 llvm::MDNode *CU = CUNode->getOperand(i);
Nick Lewycky3dc05412011-05-05 00:08:20 +00002940 llvm::Value *node[] = { CoverageFile, CU };
Nick Lewycky5ea4f442011-05-04 20:46:58 +00002941 llvm::MDNode *N = llvm::MDNode::get(Ctx, node);
2942 GCov->addOperand(N);
2943 }
2944 }
2945 }
2946}
Nico Weberc5f80462012-10-11 10:13:44 +00002947
2948llvm::Constant *CodeGenModule::EmitUuidofInitializer(StringRef Uuid,
2949 QualType GuidType) {
2950 // Sema has checked that all uuid strings are of the form
2951 // "12345678-1234-1234-1234-1234567890ab".
2952 assert(Uuid.size() == 36);
2953 const char *Uuidstr = Uuid.data();
2954 for (int i = 0; i < 36; ++i) {
2955 if (i == 8 || i == 13 || i == 18 || i == 23) assert(Uuidstr[i] == '-');
Jordan Rose3f6f51e2013-02-08 22:30:41 +00002956 else assert(isHexDigit(Uuidstr[i]));
Nico Weberc5f80462012-10-11 10:13:44 +00002957 }
2958
2959 llvm::APInt Field0(32, StringRef(Uuidstr , 8), 16);
2960 llvm::APInt Field1(16, StringRef(Uuidstr + 9, 4), 16);
2961 llvm::APInt Field2(16, StringRef(Uuidstr + 14, 4), 16);
Nico Weber193646f2012-10-17 00:34:34 +00002962 static const int Field3ValueOffsets[] = { 19, 21, 24, 26, 28, 30, 32, 34 };
Nico Weberc5f80462012-10-11 10:13:44 +00002963
2964 APValue InitStruct(APValue::UninitStruct(), /*NumBases=*/0, /*NumFields=*/4);
2965 InitStruct.getStructField(0) = APValue(llvm::APSInt(Field0));
2966 InitStruct.getStructField(1) = APValue(llvm::APSInt(Field1));
2967 InitStruct.getStructField(2) = APValue(llvm::APSInt(Field2));
2968 APValue& Arr = InitStruct.getStructField(3);
2969 Arr = APValue(APValue::UninitArray(), 8, 8);
2970 for (int t = 0; t < 8; ++t)
Nico Weber43085812012-10-13 21:56:05 +00002971 Arr.getArrayInitializedElt(t) = APValue(llvm::APSInt(
2972 llvm::APInt(8, StringRef(Uuidstr + Field3ValueOffsets[t], 2), 16)));
Nico Weberc5f80462012-10-11 10:13:44 +00002973
2974 return EmitConstantValue(InitStruct, GuidType);
2975}