blob: 2da9dba5b71e6201cd2dac7b3065df78f23148e6 [file] [log] [blame]
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"
Chandler Carruth55fc8732012-12-04 09:13:33 +000033#include "clang/Basic/ConvertUTF.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"
Chandler Carruth55fc8732012-12-04 09:13:33 +000038#include "clang/Frontend/CodeGenOptions.h"
Sebastian Redl19b1a6e2012-02-25 20:51:20 +000039#include "llvm/ADT/APSInt.h"
John McCall6374c332010-03-06 00:35:14 +000040#include "llvm/ADT/Triple.h"
Chandler Carruth3b844ba2013-01-02 11:45:17 +000041#include "llvm/IR/CallingConv.h"
42#include "llvm/IR/DataLayout.h"
43#include "llvm/IR/Intrinsics.h"
44#include "llvm/IR/LLVMContext.h"
45#include "llvm/IR/Module.h"
Gabor Greif6ba728d2010-04-10 02:56:12 +000046#include "llvm/Support/CallSite.h"
Chris Lattner78f7ece2009-11-07 09:22:46 +000047#include "llvm/Support/ErrorHandling.h"
Chandler Carruth55fc8732012-12-04 09:13:33 +000048#include "llvm/Target/Mangler.h"
Reid Spencer5f016e22007-07-11 17:01:13 +000049using namespace clang;
50using namespace CodeGen;
51
Julien Lerouge77f68bb2011-09-09 22:41:49 +000052static const char AnnotationSection[] = "llvm.metadata";
53
John McCallf16aa102010-08-22 21:01:12 +000054static CGCXXABI &createCXXABI(CodeGenModule &CGM) {
John McCallb8b2c9d2013-01-25 22:30:49 +000055 switch (CGM.getContext().getTargetInfo().getCXXABI().getKind()) {
56 // For IR-generation purposes, there's no significant difference
57 // between the ARM and iOS ABIs.
58 case TargetCXXABI::GenericARM: return *CreateARMCXXABI(CGM);
59 case TargetCXXABI::iOS: return *CreateARMCXXABI(CGM);
60 case TargetCXXABI::GenericItanium: return *CreateItaniumCXXABI(CGM);
61 case TargetCXXABI::Microsoft: return *CreateMicrosoftCXXABI(CGM);
John McCallf16aa102010-08-22 21:01:12 +000062 }
63
64 llvm_unreachable("invalid C++ ABI kind");
John McCallf16aa102010-08-22 21:01:12 +000065}
66
Reid Spencer5f016e22007-07-11 17:01:13 +000067
Chandler Carruth2811ccf2009-11-12 17:24:48 +000068CodeGenModule::CodeGenModule(ASTContext &C, const CodeGenOptions &CGO,
Micah Villmow25a6a842012-10-08 16:25:52 +000069 llvm::Module &M, const llvm::DataLayout &TD,
David Blaikied6471f72011-09-25 23:23:43 +000070 DiagnosticsEngine &diags)
David Blaikie4e4d0842012-03-11 07:00:24 +000071 : Context(C), LangOpts(C.getLangOpts()), CodeGenOpts(CGO), TheModule(M),
Micah Villmow25a6a842012-10-08 16:25:52 +000072 TheDataLayout(TD), TheTargetCodeGenInfo(0), Diags(diags),
John McCallf16aa102010-08-22 21:01:12 +000073 ABI(createCXXABI(*this)),
John McCallde5d3c72012-02-17 03:33:10 +000074 Types(*this),
Dan Gohman3d5aff52010-10-14 23:06:10 +000075 TBAA(0),
Peter Collingbourne6c0aa5f2011-10-06 18:29:37 +000076 VTables(*this), ObjCRuntime(0), OpenCLRuntime(0), CUDARuntime(0),
Dan Gohmanb49bd272012-02-16 00:57:37 +000077 DebugInfo(0), ARCData(0), NoObjCARCExceptionsMetadata(0),
78 RRData(0), CFConstantStringClassRef(0),
Peter Collingbourne6c0aa5f2011-10-06 18:29:37 +000079 ConstantStringClassRef(0), NSConstantStringType(0),
Daniel Dunbar673431a2010-07-16 00:00:15 +000080 VMContext(M.getContext()),
81 NSConcreteGlobalBlock(0), NSConcreteStackBlock(0),
John McCalld16c2cf2011-02-08 08:22:06 +000082 BlockObjectAssign(0), BlockObjectDispose(0),
Will Dietz4f45bc02013-01-18 11:30:38 +000083 BlockDescriptorType(0), GenericBlockLiteralType(0),
84 SanitizerBlacklist(CGO.SanitizerBlacklistFile),
85 SanOpts(SanitizerBlacklist.isIn(M) ?
86 SanitizerOptions::Disabled : LangOpts.Sanitize) {
87
Chris Lattner8b418682012-02-07 00:39:47 +000088 // Initialize the type cache.
89 llvm::LLVMContext &LLVMContext = M.getContext();
90 VoidTy = llvm::Type::getVoidTy(LLVMContext);
91 Int8Ty = llvm::Type::getInt8Ty(LLVMContext);
92 Int16Ty = llvm::Type::getInt16Ty(LLVMContext);
93 Int32Ty = llvm::Type::getInt32Ty(LLVMContext);
94 Int64Ty = llvm::Type::getInt64Ty(LLVMContext);
95 FloatTy = llvm::Type::getFloatTy(LLVMContext);
96 DoubleTy = llvm::Type::getDoubleTy(LLVMContext);
97 PointerWidthInBits = C.getTargetInfo().getPointerWidth(0);
98 PointerAlignInBytes =
99 C.toCharUnitsFromBits(C.getTargetInfo().getPointerAlign(0)).getQuantity();
100 IntTy = llvm::IntegerType::get(LLVMContext, C.getTargetInfo().getIntWidth());
101 IntPtrTy = llvm::IntegerType::get(LLVMContext, PointerWidthInBits);
102 Int8PtrTy = Int8Ty->getPointerTo(0);
103 Int8PtrPtrTy = Int8PtrTy->getPointerTo(0);
104
David Blaikie4e4d0842012-03-11 07:00:24 +0000105 if (LangOpts.ObjC1)
Peter Collingbourne8c25fc52011-09-19 21:14:35 +0000106 createObjCRuntime();
David Blaikie4e4d0842012-03-11 07:00:24 +0000107 if (LangOpts.OpenCL)
Peter Collingbourne8c25fc52011-09-19 21:14:35 +0000108 createOpenCLRuntime();
David Blaikie4e4d0842012-03-11 07:00:24 +0000109 if (LangOpts.CUDA)
Peter Collingbourne6c0aa5f2011-10-06 18:29:37 +0000110 createCUDARuntime();
Sanjiv Guptae8b9f5b2008-05-08 08:54:20 +0000111
Kostya Serebryanyc9fe6052012-04-24 06:57:01 +0000112 // Enable TBAA unless it's suppressed. ThreadSanitizer needs TBAA even at O0.
Will Dietz4f45bc02013-01-18 11:30:38 +0000113 if (SanOpts.Thread ||
Kostya Serebryanyc9fe6052012-04-24 06:57:01 +0000114 (!CodeGenOpts.RelaxedAliasing && CodeGenOpts.OptimizationLevel > 0))
115 TBAA = new CodeGenTBAA(Context, VMContext, CodeGenOpts, getLangOpts(),
Dan Gohman0b5c4fc2010-10-15 20:23:12 +0000116 ABI.getMangleContext());
Dan Gohman3d5aff52010-10-14 23:06:10 +0000117
Nick Lewyckye8ba8d72011-04-21 23:44:07 +0000118 // If debug info or coverage generation is enabled, create the CGDebugInfo
119 // object.
Douglas Gregor4cdad312012-10-23 20:05:01 +0000120 if (CodeGenOpts.getDebugInfo() != CodeGenOptions::NoDebugInfo ||
Alexey Samsonov3a70cd62012-04-27 07:24:20 +0000121 CodeGenOpts.EmitGcovArcs ||
Nick Lewyckye8ba8d72011-04-21 23:44:07 +0000122 CodeGenOpts.EmitGcovNotes)
123 DebugInfo = new CGDebugInfo(*this);
John McCalld16c2cf2011-02-08 08:22:06 +0000124
125 Block.GlobalUniqueCount = 0;
John McCall5936e332011-02-15 09:22:45 +0000126
David Blaikie4e4d0842012-03-11 07:00:24 +0000127 if (C.getLangOpts().ObjCAutoRefCount)
John McCallf85e1932011-06-15 23:02:42 +0000128 ARCData = new ARCEntrypoints();
129 RRData = new RREntrypoints();
Chris Lattner2b94fe32008-03-01 08:45:05 +0000130}
131
132CodeGenModule::~CodeGenModule() {
Peter Collingbournee9265232011-07-27 20:29:46 +0000133 delete ObjCRuntime;
Peter Collingbourne8c25fc52011-09-19 21:14:35 +0000134 delete OpenCLRuntime;
Peter Collingbourne6c0aa5f2011-10-06 18:29:37 +0000135 delete CUDARuntime;
Ted Kremenek0628b722011-10-08 05:28:26 +0000136 delete TheTargetCodeGenInfo;
John McCallf16aa102010-08-22 21:01:12 +0000137 delete &ABI;
Dan Gohman4376c852010-10-15 18:04:46 +0000138 delete TBAA;
Ted Kremenek815c78f2008-08-05 18:50:11 +0000139 delete DebugInfo;
John McCallf85e1932011-06-15 23:02:42 +0000140 delete ARCData;
141 delete RRData;
Ted Kremenek815c78f2008-08-05 18:50:11 +0000142}
143
David Chisnall0d13f6f2010-01-23 02:40:42 +0000144void CodeGenModule::createObjCRuntime() {
John McCall260611a2012-06-20 06:18:46 +0000145 // This is just isGNUFamily(), but we want to force implementors of
146 // new ABIs to decide how best to do this.
147 switch (LangOpts.ObjCRuntime.getKind()) {
David Chisnall11d3f4c2012-07-03 20:49:52 +0000148 case ObjCRuntime::GNUstep:
149 case ObjCRuntime::GCC:
John McCallf7226fb2012-07-12 02:07:58 +0000150 case ObjCRuntime::ObjFW:
Peter Collingbournee9265232011-07-27 20:29:46 +0000151 ObjCRuntime = CreateGNUObjCRuntime(*this);
John McCall260611a2012-06-20 06:18:46 +0000152 return;
153
154 case ObjCRuntime::FragileMacOSX:
155 case ObjCRuntime::MacOSX:
156 case ObjCRuntime::iOS:
Peter Collingbournee9265232011-07-27 20:29:46 +0000157 ObjCRuntime = CreateMacObjCRuntime(*this);
John McCall260611a2012-06-20 06:18:46 +0000158 return;
159 }
160 llvm_unreachable("bad runtime kind");
David Chisnall0d13f6f2010-01-23 02:40:42 +0000161}
162
Peter Collingbourne8c25fc52011-09-19 21:14:35 +0000163void CodeGenModule::createOpenCLRuntime() {
164 OpenCLRuntime = new CGOpenCLRuntime(*this);
165}
166
Peter Collingbourne6c0aa5f2011-10-06 18:29:37 +0000167void CodeGenModule::createCUDARuntime() {
168 CUDARuntime = CreateNVCUDARuntime(*this);
169}
170
Ted Kremenek815c78f2008-08-05 18:50:11 +0000171void CodeGenModule::Release() {
Chris Lattner82227ff2009-03-22 21:21:57 +0000172 EmitDeferred();
Eli Friedman6c6bda32010-01-08 00:50:11 +0000173 EmitCXXGlobalInitFunc();
Daniel Dunbarefb0fa92010-03-20 04:15:41 +0000174 EmitCXXGlobalDtorFunc();
Peter Collingbournee9265232011-07-27 20:29:46 +0000175 if (ObjCRuntime)
176 if (llvm::Function *ObjCInitFunction = ObjCRuntime->ModuleInitFunction())
Daniel Dunbar208ff5e2008-08-11 18:12:00 +0000177 AddGlobalCtor(ObjCInitFunction);
Daniel Dunbar6bfed7e2008-08-01 00:01:51 +0000178 EmitCtorList(GlobalCtors, "llvm.global_ctors");
179 EmitCtorList(GlobalDtors, "llvm.global_dtors");
Julien Lerouge77f68bb2011-09-09 22:41:49 +0000180 EmitGlobalAnnotations();
Daniel Dunbar02698712009-02-13 20:29:50 +0000181 EmitLLVMUsed();
Douglas Gregorf43b7212013-01-16 01:23:41 +0000182
183 if (CodeGenOpts.ModulesAutolink) {
184 EmitModuleLinkOptions();
185 }
Douglas Gregor5d75ea72013-01-14 18:28:43 +0000186
John McCallb2593832010-09-16 06:16:50 +0000187 SimplifyPersonality();
188
John McCall744016d2010-07-06 23:57:41 +0000189 if (getCodeGenOpts().EmitDeclMetadata)
190 EmitDeclMetadata();
Nick Lewycky5ea4f442011-05-04 20:46:58 +0000191
192 if (getCodeGenOpts().EmitGcovArcs || getCodeGenOpts().EmitGcovNotes)
Nick Lewycky3dc05412011-05-05 00:08:20 +0000193 EmitCoverageFile();
Devang Patelf391dbe2011-08-16 20:58:22 +0000194
195 if (DebugInfo)
196 DebugInfo->finalize();
Daniel Dunbarf1968f22008-10-01 00:49:24 +0000197}
198
Devang Patele80d5672011-03-23 16:29:39 +0000199void CodeGenModule::UpdateCompletedType(const TagDecl *TD) {
200 // Make sure that this type is translated.
201 Types.UpdateCompletedType(TD);
Devang Patele80d5672011-03-23 16:29:39 +0000202}
203
Dan Gohman3d5aff52010-10-14 23:06:10 +0000204llvm::MDNode *CodeGenModule::getTBAAInfo(QualType QTy) {
205 if (!TBAA)
206 return 0;
207 return TBAA->getTBAAInfo(QTy);
208}
209
Kostya Serebryany8cb4a072012-03-26 17:03:51 +0000210llvm::MDNode *CodeGenModule::getTBAAInfoForVTablePtr() {
211 if (!TBAA)
212 return 0;
213 return TBAA->getTBAAInfoForVTablePtr();
214}
215
Dan Gohmanb22c7dc2012-09-28 21:58:29 +0000216llvm::MDNode *CodeGenModule::getTBAAStructInfo(QualType QTy) {
217 if (!TBAA)
218 return 0;
219 return TBAA->getTBAAStructInfo(QTy);
220}
221
Dan Gohman3d5aff52010-10-14 23:06:10 +0000222void CodeGenModule::DecorateInstruction(llvm::Instruction *Inst,
223 llvm::MDNode *TBAAInfo) {
224 Inst->setMetadata(llvm::LLVMContext::MD_tbaa, TBAAInfo);
225}
226
John McCall6374c332010-03-06 00:35:14 +0000227bool CodeGenModule::isTargetDarwin() const {
Douglas Gregorbcfd1f52011-09-02 00:18:52 +0000228 return getContext().getTargetInfo().getTriple().isOSDarwin();
John McCall6374c332010-03-06 00:35:14 +0000229}
230
Chandler Carruth0f30a122012-03-30 19:44:53 +0000231void CodeGenModule::Error(SourceLocation loc, StringRef error) {
232 unsigned diagID = getDiags().getCustomDiagID(DiagnosticsEngine::Error, error);
John McCall32096692011-03-18 02:56:14 +0000233 getDiags().Report(Context.getFullLoc(loc), diagID);
234}
235
Daniel Dunbar488e9932008-08-16 00:56:44 +0000236/// ErrorUnsupported - Print out an error that codegen doesn't support the
Chris Lattner2c8569d2007-12-02 07:19:18 +0000237/// specified stmt yet.
Daniel Dunbar90df4b62008-09-04 03:43:08 +0000238void CodeGenModule::ErrorUnsupported(const Stmt *S, const char *Type,
239 bool OmitOnError) {
240 if (OmitOnError && getDiags().hasErrorOccurred())
241 return;
David Blaikied6471f72011-09-25 23:23:43 +0000242 unsigned DiagID = getDiags().getCustomDiagID(DiagnosticsEngine::Error,
Daniel Dunbar56b80012009-02-06 19:18:03 +0000243 "cannot compile this %0 yet");
Chris Lattner2c8569d2007-12-02 07:19:18 +0000244 std::string Msg = Type;
Chris Lattner0a14eee2008-11-18 07:04:44 +0000245 getDiags().Report(Context.getFullLoc(S->getLocStart()), DiagID)
246 << Msg << S->getSourceRange();
Chris Lattner2c8569d2007-12-02 07:19:18 +0000247}
Chris Lattner58c3f9e2007-12-02 06:27:33 +0000248
Daniel Dunbar488e9932008-08-16 00:56:44 +0000249/// ErrorUnsupported - Print out an error that codegen doesn't support the
Chris Lattnerc6fdc342008-01-12 07:05:38 +0000250/// specified decl yet.
Daniel Dunbar90df4b62008-09-04 03:43:08 +0000251void CodeGenModule::ErrorUnsupported(const Decl *D, const char *Type,
252 bool OmitOnError) {
253 if (OmitOnError && getDiags().hasErrorOccurred())
254 return;
David Blaikied6471f72011-09-25 23:23:43 +0000255 unsigned DiagID = getDiags().getCustomDiagID(DiagnosticsEngine::Error,
Daniel Dunbar56b80012009-02-06 19:18:03 +0000256 "cannot compile this %0 yet");
Chris Lattnerc6fdc342008-01-12 07:05:38 +0000257 std::string Msg = Type;
Chris Lattner0a14eee2008-11-18 07:04:44 +0000258 getDiags().Report(Context.getFullLoc(D->getLocation()), DiagID) << Msg;
Chris Lattnerc6fdc342008-01-12 07:05:38 +0000259}
260
John McCallbc8d40d2011-06-24 21:55:10 +0000261llvm::ConstantInt *CodeGenModule::getSize(CharUnits size) {
262 return llvm::ConstantInt::get(SizeTy, size.getQuantity());
263}
264
Mike Stump1eb44332009-09-09 15:08:12 +0000265void CodeGenModule::setGlobalVisibility(llvm::GlobalValue *GV,
Anders Carlsson0ffeaad2011-01-29 19:39:23 +0000266 const NamedDecl *D) const {
Daniel Dunbar04d40782009-04-14 06:00:08 +0000267 // Internal definitions always have default visibility.
Chris Lattnerdf102fc2009-04-14 05:27:13 +0000268 if (GV->hasLocalLinkage()) {
Daniel Dunbar7e714cd2009-04-10 20:26:50 +0000269 GV->setVisibility(llvm::GlobalValue::DefaultVisibility);
Daniel Dunbar6ab187a2009-04-07 05:48:37 +0000270 return;
Daniel Dunbar7e714cd2009-04-10 20:26:50 +0000271 }
Daniel Dunbar6ab187a2009-04-07 05:48:37 +0000272
John McCallaf146032010-10-30 11:50:40 +0000273 // Set visibility for definitions.
274 NamedDecl::LinkageInfo LV = D->getLinkageAndVisibility();
Fariborz Jahanianc7c90582011-06-16 20:14:50 +0000275 if (LV.visibilityExplicit() || !GV->hasAvailableExternallyLinkage())
276 GV->setVisibility(GetLLVMVisibility(LV.visibility()));
Dan Gohman4f8d1232008-05-22 00:50:06 +0000277}
278
Hans Wennborgde981f32012-06-28 08:01:44 +0000279static llvm::GlobalVariable::ThreadLocalMode GetLLVMTLSModel(StringRef S) {
280 return llvm::StringSwitch<llvm::GlobalVariable::ThreadLocalMode>(S)
281 .Case("global-dynamic", llvm::GlobalVariable::GeneralDynamicTLSModel)
282 .Case("local-dynamic", llvm::GlobalVariable::LocalDynamicTLSModel)
283 .Case("initial-exec", llvm::GlobalVariable::InitialExecTLSModel)
284 .Case("local-exec", llvm::GlobalVariable::LocalExecTLSModel);
285}
286
287static llvm::GlobalVariable::ThreadLocalMode GetLLVMTLSModel(
288 CodeGenOptions::TLSModel M) {
289 switch (M) {
290 case CodeGenOptions::GeneralDynamicTLSModel:
291 return llvm::GlobalVariable::GeneralDynamicTLSModel;
292 case CodeGenOptions::LocalDynamicTLSModel:
293 return llvm::GlobalVariable::LocalDynamicTLSModel;
294 case CodeGenOptions::InitialExecTLSModel:
295 return llvm::GlobalVariable::InitialExecTLSModel;
296 case CodeGenOptions::LocalExecTLSModel:
297 return llvm::GlobalVariable::LocalExecTLSModel;
298 }
299 llvm_unreachable("Invalid TLS model!");
300}
301
302void CodeGenModule::setTLSMode(llvm::GlobalVariable *GV,
303 const VarDecl &D) const {
304 assert(D.isThreadSpecified() && "setting TLS mode on non-TLS var!");
305
306 llvm::GlobalVariable::ThreadLocalMode TLM;
Douglas Gregor4cdad312012-10-23 20:05:01 +0000307 TLM = GetLLVMTLSModel(CodeGenOpts.getDefaultTLSModel());
Hans Wennborgde981f32012-06-28 08:01:44 +0000308
309 // Override the TLS model if it is explicitly specified.
310 if (D.hasAttr<TLSModelAttr>()) {
311 const TLSModelAttr *Attr = D.getAttr<TLSModelAttr>();
312 TLM = GetLLVMTLSModel(Attr->getModel());
313 }
314
315 GV->setThreadLocalMode(TLM);
316}
317
John McCallcbfe5022010-08-04 08:34:44 +0000318/// Set the symbol visibility of type information (vtable and RTTI)
319/// associated with the given type.
320void CodeGenModule::setTypeVisibility(llvm::GlobalValue *GV,
321 const CXXRecordDecl *RD,
Anders Carlssonfa2e99f2011-01-29 20:24:48 +0000322 TypeVisibilityKind TVK) const {
Anders Carlsson0ffeaad2011-01-29 19:39:23 +0000323 setGlobalVisibility(GV, RD);
John McCallcbfe5022010-08-04 08:34:44 +0000324
John McCall279b5eb2010-08-12 23:36:15 +0000325 if (!CodeGenOpts.HiddenWeakVTables)
326 return;
327
Anders Carlsson9a86a132011-01-29 20:36:11 +0000328 // We never want to drop the visibility for RTTI names.
329 if (TVK == TVK_ForRTTIName)
330 return;
331
John McCallcbfe5022010-08-04 08:34:44 +0000332 // We want to drop the visibility to hidden for weak type symbols.
333 // This isn't possible if there might be unresolved references
334 // elsewhere that rely on this symbol being visible.
335
John McCall7a536902010-08-05 20:39:18 +0000336 // This should be kept roughly in sync with setThunkVisibility
337 // in CGVTables.cpp.
338
John McCallcbfe5022010-08-04 08:34:44 +0000339 // Preconditions.
Anders Carlssonf502d932011-01-24 00:46:19 +0000340 if (GV->getLinkage() != llvm::GlobalVariable::LinkOnceODRLinkage ||
John McCallcbfe5022010-08-04 08:34:44 +0000341 GV->getVisibility() != llvm::GlobalVariable::DefaultVisibility)
342 return;
343
344 // Don't override an explicit visibility attribute.
Douglas Gregor4421d2b2011-03-26 12:10:19 +0000345 if (RD->getExplicitVisibility())
John McCallcbfe5022010-08-04 08:34:44 +0000346 return;
347
348 switch (RD->getTemplateSpecializationKind()) {
349 // We have to disable the optimization if this is an EI definition
350 // because there might be EI declarations in other shared objects.
351 case TSK_ExplicitInstantiationDefinition:
352 case TSK_ExplicitInstantiationDeclaration:
353 return;
354
John McCall7a536902010-08-05 20:39:18 +0000355 // Every use of a non-template class's type information has to emit it.
John McCallcbfe5022010-08-04 08:34:44 +0000356 case TSK_Undeclared:
357 break;
358
John McCall7a536902010-08-05 20:39:18 +0000359 // In theory, implicit instantiations can ignore the possibility of
360 // an explicit instantiation declaration because there necessarily
361 // must be an EI definition somewhere with default visibility. In
362 // practice, it's possible to have an explicit instantiation for
363 // an arbitrary template class, and linkers aren't necessarily able
364 // to deal with mixed-visibility symbols.
365 case TSK_ExplicitSpecialization:
John McCallcbfe5022010-08-04 08:34:44 +0000366 case TSK_ImplicitInstantiation:
Douglas Gregoraafd1112012-10-24 14:11:55 +0000367 return;
John McCallcbfe5022010-08-04 08:34:44 +0000368 }
369
370 // If there's a key function, there may be translation units
371 // that don't have the key function's definition. But ignore
372 // this if we're emitting RTTI under -fno-rtti.
David Blaikie4e4d0842012-03-11 07:00:24 +0000373 if (!(TVK != TVK_ForRTTI) || LangOpts.RTTI) {
John McCallcbfe5022010-08-04 08:34:44 +0000374 if (Context.getKeyFunction(RD))
375 return;
Anders Carlssonfa2e99f2011-01-29 20:24:48 +0000376 }
John McCallcbfe5022010-08-04 08:34:44 +0000377
378 // Otherwise, drop the visibility to hidden.
379 GV->setVisibility(llvm::GlobalValue::HiddenVisibility);
Rafael Espindolab1c65ff2011-01-11 21:44:37 +0000380 GV->setUnnamedAddr(true);
John McCallcbfe5022010-08-04 08:34:44 +0000381}
382
Chris Lattner5f9e2722011-07-23 10:55:15 +0000383StringRef CodeGenModule::getMangledName(GlobalDecl GD) {
Anders Carlsson793a9902010-06-22 16:05:32 +0000384 const NamedDecl *ND = cast<NamedDecl>(GD.getDecl());
385
Chris Lattner5f9e2722011-07-23 10:55:15 +0000386 StringRef &Str = MangledDeclNames[GD.getCanonicalDecl()];
Anders Carlsson793a9902010-06-22 16:05:32 +0000387 if (!Str.empty())
388 return Str;
389
John McCall4c40d982010-08-31 07:33:07 +0000390 if (!getCXXABI().getMangleContext().shouldMangleDeclName(ND)) {
Anders Carlsson793a9902010-06-22 16:05:32 +0000391 IdentifierInfo *II = ND->getIdentifier();
392 assert(II && "Attempt to mangle unnamed decl.");
393
394 Str = II->getName();
395 return Str;
396 }
397
Dylan Noblesmithf7ccbad2012-02-05 02:13:05 +0000398 SmallString<256> Buffer;
Rafael Espindolac4850c22011-02-10 23:59:36 +0000399 llvm::raw_svector_ostream Out(Buffer);
Anders Carlsson793a9902010-06-22 16:05:32 +0000400 if (const CXXConstructorDecl *D = dyn_cast<CXXConstructorDecl>(ND))
Rafael Espindolac4850c22011-02-10 23:59:36 +0000401 getCXXABI().getMangleContext().mangleCXXCtor(D, GD.getCtorType(), Out);
Anders Carlsson793a9902010-06-22 16:05:32 +0000402 else if (const CXXDestructorDecl *D = dyn_cast<CXXDestructorDecl>(ND))
Rafael Espindolac4850c22011-02-10 23:59:36 +0000403 getCXXABI().getMangleContext().mangleCXXDtor(D, GD.getDtorType(), Out);
Anders Carlsson793a9902010-06-22 16:05:32 +0000404 else if (const BlockDecl *BD = dyn_cast<BlockDecl>(ND))
Fariborz Jahanian4904bf42012-06-26 16:06:38 +0000405 getCXXABI().getMangleContext().mangleBlock(BD, Out,
406 dyn_cast_or_null<VarDecl>(initializedGlobalDecl.getDecl()));
Anders Carlsson793a9902010-06-22 16:05:32 +0000407 else
Rafael Espindolac4850c22011-02-10 23:59:36 +0000408 getCXXABI().getMangleContext().mangleName(ND, Out);
Anders Carlsson793a9902010-06-22 16:05:32 +0000409
410 // Allocate space for the mangled name.
Rafael Espindolac4850c22011-02-10 23:59:36 +0000411 Out.flush();
Anders Carlsson793a9902010-06-22 16:05:32 +0000412 size_t Length = Buffer.size();
413 char *Name = MangledNamesAllocator.Allocate<char>(Length);
414 std::copy(Buffer.begin(), Buffer.end(), Name);
415
Chris Lattner5f9e2722011-07-23 10:55:15 +0000416 Str = StringRef(Name, Length);
Anders Carlsson793a9902010-06-22 16:05:32 +0000417
418 return Str;
419}
420
Peter Collingbourne14110472011-01-13 18:57:25 +0000421void CodeGenModule::getBlockMangledName(GlobalDecl GD, MangleBuffer &Buffer,
422 const BlockDecl *BD) {
423 MangleContext &MangleCtx = getCXXABI().getMangleContext();
424 const Decl *D = GD.getDecl();
Rafael Espindolac4850c22011-02-10 23:59:36 +0000425 llvm::raw_svector_ostream Out(Buffer.getBuffer());
Peter Collingbourne14110472011-01-13 18:57:25 +0000426 if (D == 0)
Fariborz Jahanian4904bf42012-06-26 16:06:38 +0000427 MangleCtx.mangleGlobalBlock(BD,
428 dyn_cast_or_null<VarDecl>(initializedGlobalDecl.getDecl()), Out);
Peter Collingbourne14110472011-01-13 18:57:25 +0000429 else if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(D))
Rafael Espindolac4850c22011-02-10 23:59:36 +0000430 MangleCtx.mangleCtorBlock(CD, GD.getCtorType(), BD, Out);
Peter Collingbourne14110472011-01-13 18:57:25 +0000431 else if (const CXXDestructorDecl *DD = dyn_cast<CXXDestructorDecl>(D))
Rafael Espindolac4850c22011-02-10 23:59:36 +0000432 MangleCtx.mangleDtorBlock(DD, GD.getDtorType(), BD, Out);
Peter Collingbourne14110472011-01-13 18:57:25 +0000433 else
Rafael Espindolac4850c22011-02-10 23:59:36 +0000434 MangleCtx.mangleBlock(cast<DeclContext>(D), BD, Out);
Anders Carlsson9a8822b2010-06-09 02:36:32 +0000435}
436
Chris Lattner5f9e2722011-07-23 10:55:15 +0000437llvm::GlobalValue *CodeGenModule::GetGlobalValue(StringRef Name) {
John McCallf746aa62010-03-19 23:29:14 +0000438 return getModule().getNamedValue(Name);
Douglas Gregor5f2bfd42009-02-13 00:10:09 +0000439}
440
Chris Lattner6d397602008-03-14 17:18:18 +0000441/// AddGlobalCtor - Add a function to the list that will be called before
442/// main() runs.
Daniel Dunbar6bfed7e2008-08-01 00:01:51 +0000443void CodeGenModule::AddGlobalCtor(llvm::Function * Ctor, int Priority) {
Daniel Dunbar49988882009-01-13 02:25:00 +0000444 // FIXME: Type coercion of void()* types.
Daniel Dunbar6bfed7e2008-08-01 00:01:51 +0000445 GlobalCtors.push_back(std::make_pair(Ctor, Priority));
Chris Lattner6d397602008-03-14 17:18:18 +0000446}
447
Daniel Dunbar6bfed7e2008-08-01 00:01:51 +0000448/// AddGlobalDtor - Add a function to the list that will be called
449/// when the module is unloaded.
450void CodeGenModule::AddGlobalDtor(llvm::Function * Dtor, int Priority) {
Daniel Dunbar49988882009-01-13 02:25:00 +0000451 // FIXME: Type coercion of void()* types.
Daniel Dunbar6bfed7e2008-08-01 00:01:51 +0000452 GlobalDtors.push_back(std::make_pair(Dtor, Priority));
453}
454
455void CodeGenModule::EmitCtorList(const CtorList &Fns, const char *GlobalName) {
456 // Ctor function type is void()*.
John McCall0774cb82011-05-15 01:53:33 +0000457 llvm::FunctionType* CtorFTy = llvm::FunctionType::get(VoidTy, false);
Owen Anderson96e0fc72009-07-29 22:16:19 +0000458 llvm::Type *CtorPFTy = llvm::PointerType::getUnqual(CtorFTy);
Daniel Dunbar6bfed7e2008-08-01 00:01:51 +0000459
460 // Get the type of a ctor entry, { i32, void ()* }.
Chris Lattnerc5cbb902011-06-20 04:01:35 +0000461 llvm::StructType *CtorStructTy =
Chris Lattner8b418682012-02-07 00:39:47 +0000462 llvm::StructType::get(Int32Ty, llvm::PointerType::getUnqual(CtorFTy), NULL);
Chris Lattner6d397602008-03-14 17:18:18 +0000463
Daniel Dunbar6bfed7e2008-08-01 00:01:51 +0000464 // Construct the constructor and destructor arrays.
Chris Lattner0b239712012-02-06 22:16:34 +0000465 SmallVector<llvm::Constant*, 8> Ctors;
Daniel Dunbar6bfed7e2008-08-01 00:01:51 +0000466 for (CtorList::const_iterator I = Fns.begin(), E = Fns.end(); I != E; ++I) {
Chris Lattner0b239712012-02-06 22:16:34 +0000467 llvm::Constant *S[] = {
468 llvm::ConstantInt::get(Int32Ty, I->second, false),
469 llvm::ConstantExpr::getBitCast(I->first, CtorPFTy)
470 };
Owen Anderson08e25242009-07-27 22:29:56 +0000471 Ctors.push_back(llvm::ConstantStruct::get(CtorStructTy, S));
Chris Lattner6d397602008-03-14 17:18:18 +0000472 }
Daniel Dunbar6bfed7e2008-08-01 00:01:51 +0000473
474 if (!Ctors.empty()) {
Owen Anderson96e0fc72009-07-29 22:16:19 +0000475 llvm::ArrayType *AT = llvm::ArrayType::get(CtorStructTy, Ctors.size());
Owen Anderson1c431b32009-07-08 19:05:04 +0000476 new llvm::GlobalVariable(TheModule, AT, false,
Daniel Dunbar6bfed7e2008-08-01 00:01:51 +0000477 llvm::GlobalValue::AppendingLinkage,
Owen Anderson7db6d832009-07-28 18:33:04 +0000478 llvm::ConstantArray::get(AT, Ctors),
Owen Anderson1c431b32009-07-08 19:05:04 +0000479 GlobalName);
Daniel Dunbar6bfed7e2008-08-01 00:01:51 +0000480 }
Chris Lattner6d397602008-03-14 17:18:18 +0000481}
482
John McCalld46f9852010-02-19 01:32:20 +0000483llvm::GlobalValue::LinkageTypes
484CodeGenModule::getFunctionLinkage(const FunctionDecl *D) {
Argyrios Kyrtzidis90e99a82010-07-29 18:15:58 +0000485 GVALinkage Linkage = getContext().GetGVALinkageForFunction(D);
Daniel Dunbar7c65e992009-04-14 08:05:55 +0000486
Chris Lattnerf81530652010-06-30 16:58:07 +0000487 if (Linkage == GVA_Internal)
John McCalld46f9852010-02-19 01:32:20 +0000488 return llvm::Function::InternalLinkage;
Chris Lattnerf81530652010-06-30 16:58:07 +0000489
490 if (D->hasAttr<DLLExportAttr>())
John McCalld46f9852010-02-19 01:32:20 +0000491 return llvm::Function::DLLExportLinkage;
Chris Lattnerf81530652010-06-30 16:58:07 +0000492
493 if (D->hasAttr<WeakAttr>())
John McCalld46f9852010-02-19 01:32:20 +0000494 return llvm::Function::WeakAnyLinkage;
Chris Lattnerf81530652010-06-30 16:58:07 +0000495
496 // In C99 mode, 'inline' functions are guaranteed to have a strong
497 // definition somewhere else, so we can use available_externally linkage.
498 if (Linkage == GVA_C99Inline)
Fariborz Jahanianfd0f89d2011-02-04 00:08:13 +0000499 return llvm::Function::AvailableExternallyLinkage;
John McCall5584d912011-09-19 18:05:26 +0000500
501 // Note that Apple's kernel linker doesn't support symbol
502 // coalescing, so we need to avoid linkonce and weak linkages there.
503 // Normally, this means we just map to internal, but for explicit
504 // instantiations we'll map to external.
505
Chris Lattnerf81530652010-06-30 16:58:07 +0000506 // In C++, the compiler has to emit a definition in every translation unit
507 // that references the function. We should use linkonce_odr because
508 // a) if all references in this translation unit are optimized away, we
509 // don't need to codegen it. b) if the function persists, it needs to be
510 // merged with other definitions. c) C++ has the ODR, so we know the
511 // definition is dependable.
512 if (Linkage == GVA_CXXInline || Linkage == GVA_TemplateInstantiation)
David Blaikie4e4d0842012-03-11 07:00:24 +0000513 return !Context.getLangOpts().AppleKext
Fariborz Jahanian142f9e92011-02-04 00:01:24 +0000514 ? llvm::Function::LinkOnceODRLinkage
515 : llvm::Function::InternalLinkage;
Chris Lattnerf81530652010-06-30 16:58:07 +0000516
517 // An explicit instantiation of a template has weak linkage, since
518 // explicit instantiations can occur in multiple translation units
519 // and must all be equivalent. However, we are not allowed to
520 // throw away these explicit instantiations.
521 if (Linkage == GVA_ExplicitTemplateInstantiation)
David Blaikie4e4d0842012-03-11 07:00:24 +0000522 return !Context.getLangOpts().AppleKext
Fariborz Jahanian142f9e92011-02-04 00:01:24 +0000523 ? llvm::Function::WeakODRLinkage
John McCall5584d912011-09-19 18:05:26 +0000524 : llvm::Function::ExternalLinkage;
Chris Lattnerf81530652010-06-30 16:58:07 +0000525
526 // Otherwise, we have strong external linkage.
527 assert(Linkage == GVA_StrongExternal);
528 return llvm::Function::ExternalLinkage;
John McCalld46f9852010-02-19 01:32:20 +0000529}
Nuno Lopesd4cbda62008-06-08 15:45:52 +0000530
John McCalld46f9852010-02-19 01:32:20 +0000531
532/// SetFunctionDefinitionAttributes - Set attributes for a global.
533///
534/// FIXME: This is currently only done for aliases and functions, but not for
535/// variables (these details are set in EmitGlobalVarDefinition for variables).
536void CodeGenModule::SetFunctionDefinitionAttributes(const FunctionDecl *D,
537 llvm::GlobalValue *GV) {
Daniel Dunbar7c65e992009-04-14 08:05:55 +0000538 SetCommonAttributes(D, GV);
Nuno Lopesd4cbda62008-06-08 15:45:52 +0000539}
540
Daniel Dunbar7dbd8192009-04-14 07:08:30 +0000541void CodeGenModule::SetLLVMFunctionAttributes(const Decl *D,
Mike Stump1eb44332009-09-09 15:08:12 +0000542 const CGFunctionInfo &Info,
Daniel Dunbar7dbd8192009-04-14 07:08:30 +0000543 llvm::Function *F) {
Daniel Dunbarca6408c2009-09-12 00:59:20 +0000544 unsigned CallingConv;
Devang Patel761d7f72008-09-25 21:02:23 +0000545 AttributeListType AttributeList;
Daniel Dunbarca6408c2009-09-12 00:59:20 +0000546 ConstructAttributeList(Info, D, AttributeList, CallingConv);
Bill Wendling785b7782012-12-07 23:17:26 +0000547 F->setAttributes(llvm::AttributeSet::get(getLLVMContext(), AttributeList));
Daniel Dunbarca6408c2009-09-12 00:59:20 +0000548 F->setCallingConv(static_cast<llvm::CallingConv::ID>(CallingConv));
Daniel Dunbarf80519b2008-09-04 23:41:35 +0000549}
550
John McCalld1e40d52011-10-02 01:16:38 +0000551/// Determines whether the language options require us to model
552/// unwind exceptions. We treat -fexceptions as mandating this
553/// except under the fragile ObjC ABI with only ObjC exceptions
554/// enabled. This means, for example, that C with -fexceptions
555/// enables this.
David Blaikie4e4d0842012-03-11 07:00:24 +0000556static bool hasUnwindExceptions(const LangOptions &LangOpts) {
John McCalld1e40d52011-10-02 01:16:38 +0000557 // If exceptions are completely disabled, obviously this is false.
David Blaikie4e4d0842012-03-11 07:00:24 +0000558 if (!LangOpts.Exceptions) return false;
John McCalld1e40d52011-10-02 01:16:38 +0000559
560 // If C++ exceptions are enabled, this is true.
David Blaikie4e4d0842012-03-11 07:00:24 +0000561 if (LangOpts.CXXExceptions) return true;
John McCalld1e40d52011-10-02 01:16:38 +0000562
563 // If ObjC exceptions are enabled, this depends on the ABI.
David Blaikie4e4d0842012-03-11 07:00:24 +0000564 if (LangOpts.ObjCExceptions) {
David Chisnall11d3f4c2012-07-03 20:49:52 +0000565 return LangOpts.ObjCRuntime.hasUnwindExceptions();
John McCalld1e40d52011-10-02 01:16:38 +0000566 }
567
568 return true;
569}
570
Daniel Dunbar7c65e992009-04-14 08:05:55 +0000571void CodeGenModule::SetLLVMFunctionAttributesForDefinition(const Decl *D,
572 llvm::Function *F) {
Rafael Espindolaabca5a12011-05-25 03:44:55 +0000573 if (CodeGenOpts.UnwindTables)
574 F->setHasUWTable();
575
David Blaikie4e4d0842012-03-11 07:00:24 +0000576 if (!hasUnwindExceptions(LangOpts))
Bill Wendling72390b32012-12-20 19:27:06 +0000577 F->addFnAttr(llvm::Attribute::NoUnwind);
Daniel Dunbaraf668b02008-10-28 00:17:57 +0000578
Eli Friedman2873aee2011-08-22 23:55:33 +0000579 if (D->hasAttr<NakedAttr>()) {
580 // Naked implies noinline: we should not be inlining such functions.
Bill Wendling72390b32012-12-20 19:27:06 +0000581 F->addFnAttr(llvm::Attribute::Naked);
582 F->addFnAttr(llvm::Attribute::NoInline);
Eli Friedman2873aee2011-08-22 23:55:33 +0000583 }
Daniel Dunbardd0cb222010-09-29 18:20:25 +0000584
Mike Stump1feade82009-08-26 22:31:08 +0000585 if (D->hasAttr<NoInlineAttr>())
Bill Wendling72390b32012-12-20 19:27:06 +0000586 F->addFnAttr(llvm::Attribute::NoInline);
Mike Stumpf55314d2009-10-05 21:58:44 +0000587
Eli Friedman2873aee2011-08-22 23:55:33 +0000588 // (noinline wins over always_inline, and we can't specify both in IR)
Michael J. Spenceradc6cbf2012-06-18 07:00:48 +0000589 if ((D->hasAttr<AlwaysInlineAttr>() || D->hasAttr<ForceInlineAttr>()) &&
Bill Wendling01ad9542012-12-30 10:32:17 +0000590 !F->getAttributes().hasAttribute(llvm::AttributeSet::FunctionIndex,
591 llvm::Attribute::NoInline))
Bill Wendling72390b32012-12-20 19:27:06 +0000592 F->addFnAttr(llvm::Attribute::AlwaysInline);
Eli Friedman2873aee2011-08-22 23:55:33 +0000593
Benjamin Krameree409a92012-05-12 21:10:52 +0000594 // FIXME: Communicate hot and cold attributes to LLVM more directly.
595 if (D->hasAttr<ColdAttr>())
Bill Wendling72390b32012-12-20 19:27:06 +0000596 F->addFnAttr(llvm::Attribute::OptimizeForSize);
Benjamin Krameree409a92012-05-12 21:10:52 +0000597
Quentin Colombetaee56fa2012-11-01 23:55:47 +0000598 if (D->hasAttr<MinSizeAttr>())
Bill Wendling72390b32012-12-20 19:27:06 +0000599 F->addFnAttr(llvm::Attribute::MinSize);
Quentin Colombetaee56fa2012-11-01 23:55:47 +0000600
Rafael Espindolac5f657f2011-01-11 00:26:26 +0000601 if (isa<CXXConstructorDecl>(D) || isa<CXXDestructorDecl>(D))
602 F->setUnnamedAddr(true);
603
Richard Smithef4d5ce2012-09-28 22:46:07 +0000604 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D))
605 if (MD->isVirtual())
606 F->setUnnamedAddr(true);
607
David Blaikie4e4d0842012-03-11 07:00:24 +0000608 if (LangOpts.getStackProtector() == LangOptions::SSPOn)
Bill Wendling72390b32012-12-20 19:27:06 +0000609 F->addFnAttr(llvm::Attribute::StackProtect);
David Blaikie4e4d0842012-03-11 07:00:24 +0000610 else if (LangOpts.getStackProtector() == LangOptions::SSPReq)
Bill Wendling72390b32012-12-20 19:27:06 +0000611 F->addFnAttr(llvm::Attribute::StackProtectReq);
Will Dietz4f45bc02013-01-18 11:30:38 +0000612
613 if (SanOpts.Address) {
Alexander Potapenko89651ea2012-02-02 11:49:28 +0000614 // When AddressSanitizer is enabled, set AddressSafety attribute
615 // unless __attribute__((no_address_safety_analysis)) is used.
616 if (!D->hasAttr<NoAddressSafetyAnalysisAttr>())
Bill Wendling72390b32012-12-20 19:27:06 +0000617 F->addFnAttr(llvm::Attribute::AddressSafety);
Alexander Potapenko89651ea2012-02-02 11:49:28 +0000618 }
619
Sean Huntcf807c42010-08-18 23:23:40 +0000620 unsigned alignment = D->getMaxAlignment() / Context.getCharWidth();
621 if (alignment)
622 F->setAlignment(alignment);
623
Mike Stumpfb51ddf2009-10-05 22:49:20 +0000624 // C++ ABI requires 2-byte alignment for member functions.
Mike Stumpbd6dbd12009-10-05 23:08:21 +0000625 if (F->getAlignment() < 2 && isa<CXXMethodDecl>(D))
626 F->setAlignment(2);
Daniel Dunbarf80519b2008-09-04 23:41:35 +0000627}
628
Mike Stump1eb44332009-09-09 15:08:12 +0000629void CodeGenModule::SetCommonAttributes(const Decl *D,
Daniel Dunbar7c65e992009-04-14 08:05:55 +0000630 llvm::GlobalValue *GV) {
Anders Carlsson934176f2011-01-29 19:41:00 +0000631 if (const NamedDecl *ND = dyn_cast<NamedDecl>(D))
632 setGlobalVisibility(GV, ND);
John McCall1fb0caa2010-10-22 21:05:15 +0000633 else
634 GV->setVisibility(llvm::GlobalValue::DefaultVisibility);
Daniel Dunbar7c65e992009-04-14 08:05:55 +0000635
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +0000636 if (D->hasAttr<UsedAttr>())
Daniel Dunbar7c65e992009-04-14 08:05:55 +0000637 AddUsedGlobal(GV);
638
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +0000639 if (const SectionAttr *SA = D->getAttr<SectionAttr>())
Daniel Dunbar7c65e992009-04-14 08:05:55 +0000640 GV->setSection(SA->getName());
Anton Korobeynikov82d0a412010-01-10 12:58:08 +0000641
642 getTargetCodeGenInfo().SetTargetAttributes(D, GV, *this);
Daniel Dunbar7c65e992009-04-14 08:05:55 +0000643}
644
Daniel Dunbar0e4f40e2009-04-17 00:48:04 +0000645void CodeGenModule::SetInternalFunctionAttributes(const Decl *D,
646 llvm::Function *F,
647 const CGFunctionInfo &FI) {
648 SetLLVMFunctionAttributes(D, FI, F);
649 SetLLVMFunctionAttributesForDefinition(D, F);
Daniel Dunbar7c65e992009-04-14 08:05:55 +0000650
651 F->setLinkage(llvm::Function::InternalLinkage);
652
Daniel Dunbar0e4f40e2009-04-17 00:48:04 +0000653 SetCommonAttributes(D, F);
Daniel Dunbarf80519b2008-09-04 23:41:35 +0000654}
655
Anders Carlssonb2bcf1c2010-02-06 02:44:09 +0000656void CodeGenModule::SetFunctionAttributes(GlobalDecl GD,
Eli Friedmanc6c14d12009-05-26 01:22:57 +0000657 llvm::Function *F,
658 bool IsIncompleteFunction) {
Peter Collingbourne0ac2cf42011-04-06 12:29:04 +0000659 if (unsigned IID = F->getIntrinsicID()) {
660 // If this is an intrinsic function, set the function's attributes
661 // to the intrinsic's attributes.
Bill Wendling50e6b182012-10-15 04:47:45 +0000662 F->setAttributes(llvm::Intrinsic::getAttributes(getLLVMContext(),
663 (llvm::Intrinsic::ID)IID));
Peter Collingbourne0ac2cf42011-04-06 12:29:04 +0000664 return;
665 }
666
Anders Carlssonb2bcf1c2010-02-06 02:44:09 +0000667 const FunctionDecl *FD = cast<FunctionDecl>(GD.getDecl());
668
Eli Friedmanc6c14d12009-05-26 01:22:57 +0000669 if (!IsIncompleteFunction)
John McCallde5d3c72012-02-17 03:33:10 +0000670 SetLLVMFunctionAttributes(FD, getTypes().arrangeGlobalDeclaration(GD), F);
Mike Stump1eb44332009-09-09 15:08:12 +0000671
Daniel Dunbar7c65e992009-04-14 08:05:55 +0000672 // Only a few attributes are set on declarations; these may later be
673 // overridden by a definition.
Mike Stump1eb44332009-09-09 15:08:12 +0000674
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +0000675 if (FD->hasAttr<DLLImportAttr>()) {
Daniel Dunbar7c65e992009-04-14 08:05:55 +0000676 F->setLinkage(llvm::Function::DLLImportLinkage);
Mike Stump1eb44332009-09-09 15:08:12 +0000677 } else if (FD->hasAttr<WeakAttr>() ||
Douglas Gregor0a0d2b12011-03-23 00:50:03 +0000678 FD->isWeakImported()) {
Daniel Dunbar7c65e992009-04-14 08:05:55 +0000679 // "extern_weak" is overloaded in LLVM; we probably should have
Mike Stump1eb44332009-09-09 15:08:12 +0000680 // separate linkage types for this.
Daniel Dunbar7c65e992009-04-14 08:05:55 +0000681 F->setLinkage(llvm::Function::ExternalWeakLinkage);
682 } else {
Mike Stump1eb44332009-09-09 15:08:12 +0000683 F->setLinkage(llvm::Function::ExternalLinkage);
John McCallaf146032010-10-30 11:50:40 +0000684
685 NamedDecl::LinkageInfo LV = FD->getLinkageAndVisibility();
686 if (LV.linkage() == ExternalLinkage && LV.visibilityExplicit()) {
687 F->setVisibility(GetLLVMVisibility(LV.visibility()));
688 }
Daniel Dunbar7c65e992009-04-14 08:05:55 +0000689 }
690
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +0000691 if (const SectionAttr *SA = FD->getAttr<SectionAttr>())
Daniel Dunbar7c65e992009-04-14 08:05:55 +0000692 F->setSection(SA->getName());
Daniel Dunbar219df662008-09-08 23:44:31 +0000693}
694
Daniel Dunbar02698712009-02-13 20:29:50 +0000695void CodeGenModule::AddUsedGlobal(llvm::GlobalValue *GV) {
Mike Stump1eb44332009-09-09 15:08:12 +0000696 assert(!GV->isDeclaration() &&
Daniel Dunbar02698712009-02-13 20:29:50 +0000697 "Only globals with definition can force usage.");
Chris Lattner35f38a22009-03-31 22:37:52 +0000698 LLVMUsed.push_back(GV);
Daniel Dunbar02698712009-02-13 20:29:50 +0000699}
700
701void CodeGenModule::EmitLLVMUsed() {
702 // Don't create llvm.used if there is no need.
Chris Lattnerad64e022009-07-17 23:57:13 +0000703 if (LLVMUsed.empty())
Daniel Dunbar02698712009-02-13 20:29:50 +0000704 return;
705
Chris Lattner35f38a22009-03-31 22:37:52 +0000706 // Convert LLVMUsed to what ConstantArray needs.
Chris Lattner0b239712012-02-06 22:16:34 +0000707 SmallVector<llvm::Constant*, 8> UsedArray;
Chris Lattner35f38a22009-03-31 22:37:52 +0000708 UsedArray.resize(LLVMUsed.size());
709 for (unsigned i = 0, e = LLVMUsed.size(); i != e; ++i) {
Mike Stump1eb44332009-09-09 15:08:12 +0000710 UsedArray[i] =
711 llvm::ConstantExpr::getBitCast(cast<llvm::Constant>(&*LLVMUsed[i]),
Chris Lattner0b239712012-02-06 22:16:34 +0000712 Int8PtrTy);
Chris Lattner35f38a22009-03-31 22:37:52 +0000713 }
Mike Stump1eb44332009-09-09 15:08:12 +0000714
Fariborz Jahanianc38e9af2009-06-23 21:47:46 +0000715 if (UsedArray.empty())
716 return;
Chris Lattner0b239712012-02-06 22:16:34 +0000717 llvm::ArrayType *ATy = llvm::ArrayType::get(Int8PtrTy, UsedArray.size());
Mike Stump1eb44332009-09-09 15:08:12 +0000718
719 llvm::GlobalVariable *GV =
720 new llvm::GlobalVariable(getModule(), ATy, false,
Daniel Dunbar02698712009-02-13 20:29:50 +0000721 llvm::GlobalValue::AppendingLinkage,
Owen Anderson7db6d832009-07-28 18:33:04 +0000722 llvm::ConstantArray::get(ATy, UsedArray),
Owen Anderson1c431b32009-07-08 19:05:04 +0000723 "llvm.used");
Daniel Dunbar02698712009-02-13 20:29:50 +0000724
725 GV->setSection("llvm.metadata");
726}
727
Douglas Gregor858afb32013-01-14 20:53:57 +0000728/// \brief Add link options implied by the given module, including modules
729/// it depends on, using a postorder walk.
730static void addLinkOptionsPostorder(llvm::LLVMContext &Context,
731 Module *Mod,
Daniel Dunbarf9d03c12013-01-17 01:35:06 +0000732 SmallVectorImpl<llvm::Value *> &Metadata,
Douglas Gregor858afb32013-01-14 20:53:57 +0000733 llvm::SmallPtrSet<Module *, 16> &Visited) {
734 // Import this module's parent.
735 if (Mod->Parent && Visited.insert(Mod->Parent)) {
736 addLinkOptionsPostorder(Context, Mod->Parent, Metadata, Visited);
737 }
738
739 // Import this module's dependencies.
740 for (unsigned I = Mod->Imports.size(); I > 0; --I) {
741 if (Visited.insert(Mod->Imports[I-1]))
742 addLinkOptionsPostorder(Context, Mod->Imports[I-1], Metadata, Visited);
743 }
744
745 // Add linker options to link against the libraries/frameworks
746 // described by this module.
747 for (unsigned I = Mod->LinkLibraries.size(); I > 0; --I) {
748 // FIXME: -lfoo is Unix-centric and -framework Foo is Darwin-centric.
749 // We need to know more about the linker to know how to encode these
750 // options propertly.
751
752 // Link against a framework.
753 if (Mod->LinkLibraries[I-1].IsFramework) {
754 llvm::Value *Args[2] = {
755 llvm::MDString::get(Context, "-framework"),
756 llvm::MDString::get(Context, Mod->LinkLibraries[I-1].Library)
757 };
758
759 Metadata.push_back(llvm::MDNode::get(Context, Args));
760 continue;
761 }
762
763 // Link against a library.
764 llvm::Value *OptString
765 = llvm::MDString::get(Context,
766 "-l" + Mod->LinkLibraries[I-1].Library);
767 Metadata.push_back(llvm::MDNode::get(Context, OptString));
768 }
769}
770
771void CodeGenModule::EmitModuleLinkOptions() {
772 // Collect the set of all of the modules we want to visit to emit link
773 // options, which is essentially the imported modules and all of their
774 // non-explicit child modules.
775 llvm::SetVector<clang::Module *> LinkModules;
776 llvm::SmallPtrSet<clang::Module *, 16> Visited;
777 SmallVector<clang::Module *, 16> Stack;
778
779 // Seed the stack with imported modules.
780 for (llvm::SetVector<clang::Module *>::iterator M = ImportedModules.begin(),
781 MEnd = ImportedModules.end();
782 M != MEnd; ++M) {
783 if (Visited.insert(*M))
784 Stack.push_back(*M);
785 }
786
787 // Find all of the modules to import, making a little effort to prune
788 // non-leaf modules.
789 while (!Stack.empty()) {
790 clang::Module *Mod = Stack.back();
791 Stack.pop_back();
792
793 bool AnyChildren = false;
794
795 // Visit the submodules of this module.
796 for (clang::Module::submodule_iterator Sub = Mod->submodule_begin(),
797 SubEnd = Mod->submodule_end();
798 Sub != SubEnd; ++Sub) {
799 // Skip explicit children; they need to be explicitly imported to be
800 // linked against.
801 if ((*Sub)->IsExplicit)
802 continue;
803
804 if (Visited.insert(*Sub)) {
805 Stack.push_back(*Sub);
806 AnyChildren = true;
807 }
808 }
809
810 // We didn't find any children, so add this module to the list of
811 // modules to link against.
812 if (!AnyChildren) {
813 LinkModules.insert(Mod);
814 }
815 }
816
817 // Add link options for all of the imported modules in reverse topological
818 // order.
Daniel Dunbarf9d03c12013-01-17 01:35:06 +0000819 SmallVector<llvm::Value *, 16> MetadataArgs;
Douglas Gregor858afb32013-01-14 20:53:57 +0000820 Visited.clear();
821 for (llvm::SetVector<clang::Module *>::iterator M = LinkModules.begin(),
822 MEnd = LinkModules.end();
823 M != MEnd; ++M) {
824 if (Visited.insert(*M))
825 addLinkOptionsPostorder(getLLVMContext(), *M, MetadataArgs, Visited);
826 }
Daniel Dunbarf9d03c12013-01-17 01:35:06 +0000827 std::reverse(MetadataArgs.begin(), MetadataArgs.end());
Douglas Gregor858afb32013-01-14 20:53:57 +0000828
Daniel Dunbarf9d03c12013-01-17 01:35:06 +0000829 // Add the linker options metadata flag.
830 getModule().addModuleFlag(llvm::Module::AppendUnique, "Linker Options",
831 llvm::MDNode::get(getLLVMContext(), MetadataArgs));
Douglas Gregor858afb32013-01-14 20:53:57 +0000832}
833
Daniel Dunbar02698712009-02-13 20:29:50 +0000834void CodeGenModule::EmitDeferred() {
Chris Lattner67b00522009-03-21 09:44:56 +0000835 // Emit code for any potentially referenced deferred decls. Since a
836 // previously unused static decl may become used during the generation of code
Nick Lewyckydce67a72011-07-18 05:26:13 +0000837 // for a static function, iterate until no changes are made.
Rafael Espindolabbf58bb2010-03-10 02:19:29 +0000838
Anders Carlsson046c2942010-04-17 20:15:18 +0000839 while (!DeferredDeclsToEmit.empty() || !DeferredVTables.empty()) {
840 if (!DeferredVTables.empty()) {
841 const CXXRecordDecl *RD = DeferredVTables.back();
842 DeferredVTables.pop_back();
Charles Davis9ee494f2012-06-23 23:44:00 +0000843 getCXXABI().EmitVTables(RD);
Rafael Espindolabbf58bb2010-03-10 02:19:29 +0000844 continue;
845 }
846
Anders Carlsson2a131fb2009-05-05 04:44:02 +0000847 GlobalDecl D = DeferredDeclsToEmit.back();
Chris Lattner67b00522009-03-21 09:44:56 +0000848 DeferredDeclsToEmit.pop_back();
849
John McCallc76702c2010-05-27 01:45:30 +0000850 // Check to see if we've already emitted this. This is necessary
851 // for a couple of reasons: first, decls can end up in the
852 // deferred-decls queue multiple times, and second, decls can end
853 // up with definitions in unusual ways (e.g. by an extern inline
854 // function acquiring a strong function redefinition). Just
855 // ignore these cases.
856 //
857 // TODO: That said, looking this up multiple times is very wasteful.
Chris Lattner5f9e2722011-07-23 10:55:15 +0000858 StringRef Name = getMangledName(D);
John McCallf746aa62010-03-19 23:29:14 +0000859 llvm::GlobalValue *CGRef = GetGlobalValue(Name);
Chris Lattner67b00522009-03-21 09:44:56 +0000860 assert(CGRef && "Deferred decl wasn't referenced?");
Mike Stump1eb44332009-09-09 15:08:12 +0000861
Chris Lattner67b00522009-03-21 09:44:56 +0000862 if (!CGRef->isDeclaration())
863 continue;
Mike Stump1eb44332009-09-09 15:08:12 +0000864
John McCallc76702c2010-05-27 01:45:30 +0000865 // GlobalAlias::isDeclaration() defers to the aliasee, but for our
866 // purposes an alias counts as a definition.
867 if (isa<llvm::GlobalAlias>(CGRef))
868 continue;
869
Chris Lattner67b00522009-03-21 09:44:56 +0000870 // Otherwise, emit the definition and move on to the next one.
871 EmitGlobalDefinition(D);
872 }
Reid Spencer5f016e22007-07-11 17:01:13 +0000873}
874
Julien Lerouge77f68bb2011-09-09 22:41:49 +0000875void CodeGenModule::EmitGlobalAnnotations() {
876 if (Annotations.empty())
877 return;
878
879 // Create a new global variable for the ConstantStruct in the Module.
880 llvm::Constant *Array = llvm::ConstantArray::get(llvm::ArrayType::get(
881 Annotations[0]->getType(), Annotations.size()), Annotations);
882 llvm::GlobalValue *gv = new llvm::GlobalVariable(getModule(),
883 Array->getType(), false, llvm::GlobalValue::AppendingLinkage, Array,
884 "llvm.global.annotations");
885 gv->setSection(AnnotationSection);
886}
887
Dmitri Gribenkocfa88f82013-01-12 19:30:44 +0000888llvm::Constant *CodeGenModule::EmitAnnotationString(StringRef Str) {
Julien Lerouge77f68bb2011-09-09 22:41:49 +0000889 llvm::StringMap<llvm::Constant*>::iterator i = AnnotationStrings.find(Str);
890 if (i != AnnotationStrings.end())
891 return i->second;
892
893 // Not found yet, create a new global.
Chris Lattner94010692012-02-05 02:30:40 +0000894 llvm::Constant *s = llvm::ConstantDataArray::getString(getLLVMContext(), Str);
Julien Lerouge77f68bb2011-09-09 22:41:49 +0000895 llvm::GlobalValue *gv = new llvm::GlobalVariable(getModule(), s->getType(),
896 true, llvm::GlobalValue::PrivateLinkage, s, ".str");
897 gv->setSection(AnnotationSection);
898 gv->setUnnamedAddr(true);
899 AnnotationStrings[Str] = gv;
900 return gv;
901}
902
903llvm::Constant *CodeGenModule::EmitAnnotationUnit(SourceLocation Loc) {
904 SourceManager &SM = getContext().getSourceManager();
905 PresumedLoc PLoc = SM.getPresumedLoc(Loc);
906 if (PLoc.isValid())
907 return EmitAnnotationString(PLoc.getFilename());
908 return EmitAnnotationString(SM.getBufferName(Loc));
909}
910
911llvm::Constant *CodeGenModule::EmitAnnotationLineNo(SourceLocation L) {
912 SourceManager &SM = getContext().getSourceManager();
913 PresumedLoc PLoc = SM.getPresumedLoc(L);
914 unsigned LineNo = PLoc.isValid() ? PLoc.getLine() :
915 SM.getExpansionLineNumber(L);
916 return llvm::ConstantInt::get(Int32Ty, LineNo);
917}
918
Mike Stump1eb44332009-09-09 15:08:12 +0000919llvm::Constant *CodeGenModule::EmitAnnotateAttr(llvm::GlobalValue *GV,
Nate Begeman8bd4afe2008-04-19 04:17:09 +0000920 const AnnotateAttr *AA,
Julien Lerouge77f68bb2011-09-09 22:41:49 +0000921 SourceLocation L) {
922 // Get the globals for file name, annotation, and the line number.
923 llvm::Constant *AnnoGV = EmitAnnotationString(AA->getAnnotation()),
924 *UnitGV = EmitAnnotationUnit(L),
925 *LineNoCst = EmitAnnotationLineNo(L);
Nate Begeman8bd4afe2008-04-19 04:17:09 +0000926
Daniel Dunbar57d5cee2009-04-14 22:41:13 +0000927 // Create the ConstantStruct for the global annotation.
Nate Begeman8bd4afe2008-04-19 04:17:09 +0000928 llvm::Constant *Fields[4] = {
Julien Lerouge77f68bb2011-09-09 22:41:49 +0000929 llvm::ConstantExpr::getBitCast(GV, Int8PtrTy),
930 llvm::ConstantExpr::getBitCast(AnnoGV, Int8PtrTy),
931 llvm::ConstantExpr::getBitCast(UnitGV, Int8PtrTy),
932 LineNoCst
Nate Begeman8bd4afe2008-04-19 04:17:09 +0000933 };
Chris Lattnerc5cbb902011-06-20 04:01:35 +0000934 return llvm::ConstantStruct::getAnon(Fields);
Nate Begeman8bd4afe2008-04-19 04:17:09 +0000935}
936
Julien Lerouge77f68bb2011-09-09 22:41:49 +0000937void CodeGenModule::AddGlobalAnnotations(const ValueDecl *D,
938 llvm::GlobalValue *GV) {
939 assert(D->hasAttr<AnnotateAttr>() && "no annotate attribute");
940 // Get the struct elements for these annotations.
941 for (specific_attr_iterator<AnnotateAttr>
942 ai = D->specific_attr_begin<AnnotateAttr>(),
943 ae = D->specific_attr_end<AnnotateAttr>(); ai != ae; ++ai)
944 Annotations.push_back(EmitAnnotateAttr(GV, *ai, D->getLocation()));
945}
946
Argyrios Kyrtzidisa6d6af32010-07-27 22:37:14 +0000947bool CodeGenModule::MayDeferGeneration(const ValueDecl *Global) {
Argyrios Kyrtzidis90e99a82010-07-29 18:15:58 +0000948 // Never defer when EmitAllDecls is specified.
David Blaikie4e4d0842012-03-11 07:00:24 +0000949 if (LangOpts.EmitAllDecls)
Daniel Dunbar73241df2009-02-13 21:18:01 +0000950 return false;
Daniel Dunbarbd012ff2008-07-29 23:18:29 +0000951
Argyrios Kyrtzidis4ac7c0b2010-07-29 20:08:05 +0000952 return !getContext().DeclMustBeEmitted(Global);
Daniel Dunbar73241df2009-02-13 21:18:01 +0000953}
954
Nico Weberc5f80462012-10-11 10:13:44 +0000955llvm::Constant *CodeGenModule::GetAddrOfUuidDescriptor(
956 const CXXUuidofExpr* E) {
957 // Sema has verified that IIDSource has a __declspec(uuid()), and that its
958 // well-formed.
959 StringRef Uuid;
960 if (E->isTypeOperand())
961 Uuid = CXXUuidofExpr::GetUuidAttrOfType(E->getTypeOperand())->getGuid();
962 else {
963 // Special case: __uuidof(0) means an all-zero GUID.
964 Expr *Op = E->getExprOperand();
965 if (!Op->isNullPointerConstant(Context, Expr::NPC_ValueDependentIsNull))
966 Uuid = CXXUuidofExpr::GetUuidAttrOfType(Op->getType())->getGuid();
967 else
968 Uuid = "00000000-0000-0000-0000-000000000000";
969 }
970 std::string Name = "__uuid_" + Uuid.str();
971
972 // Look for an existing global.
973 if (llvm::GlobalVariable *GV = getModule().getNamedGlobal(Name))
974 return GV;
975
976 llvm::Constant *Init = EmitUuidofInitializer(Uuid, E->getType());
977 assert(Init && "failed to initialize as constant");
978
979 // GUIDs are assumed to be 16 bytes, spread over 4-2-2-8 bytes. However, the
980 // first field is declared as "long", which for many targets is 8 bytes.
981 // Those architectures are not supported. (With the MS abi, long is always 4
982 // bytes.)
983 llvm::Type *GuidType = getTypes().ConvertType(E->getType());
984 if (Init->getType() != GuidType) {
985 DiagnosticsEngine &Diags = getDiags();
986 unsigned DiagID = Diags.getCustomDiagID(DiagnosticsEngine::Error,
987 "__uuidof codegen is not supported on this architecture");
988 Diags.Report(E->getExprLoc(), DiagID) << E->getSourceRange();
989 Init = llvm::UndefValue::get(GuidType);
990 }
991
992 llvm::GlobalVariable *GV = new llvm::GlobalVariable(getModule(), GuidType,
993 /*isConstant=*/true, llvm::GlobalValue::PrivateLinkage, Init, Name);
994 GV->setUnnamedAddr(true);
995 return GV;
996}
997
Rafael Espindola6a836702010-03-04 18:17:24 +0000998llvm::Constant *CodeGenModule::GetWeakRefReference(const ValueDecl *VD) {
999 const AliasAttr *AA = VD->getAttr<AliasAttr>();
1000 assert(AA && "No alias?");
1001
Chris Lattner2acc6e32011-07-18 04:24:23 +00001002 llvm::Type *DeclTy = getTypes().ConvertTypeForMem(VD->getType());
Rafael Espindola6a836702010-03-04 18:17:24 +00001003
Rafael Espindola6a836702010-03-04 18:17:24 +00001004 // See if there is already something with the target's name in the module.
John McCallf746aa62010-03-19 23:29:14 +00001005 llvm::GlobalValue *Entry = GetGlobalValue(AA->getAliasee());
Joerg Sonnenberger4695f912012-10-16 17:45:27 +00001006 if (Entry) {
1007 unsigned AS = getContext().getTargetAddressSpace(VD->getType());
1008 return llvm::ConstantExpr::getBitCast(Entry, DeclTy->getPointerTo(AS));
1009 }
Rafael Espindola6a836702010-03-04 18:17:24 +00001010
1011 llvm::Constant *Aliasee;
1012 if (isa<llvm::FunctionType>(DeclTy))
Alex Rosenbergc857ce82012-10-05 23:12:53 +00001013 Aliasee = GetOrCreateLLVMFunction(AA->getAliasee(), DeclTy,
1014 GlobalDecl(cast<FunctionDecl>(VD)),
Anders Carlsson1faa89f2011-02-05 04:35:53 +00001015 /*ForVTable=*/false);
Rafael Espindola6a836702010-03-04 18:17:24 +00001016 else
John McCallf746aa62010-03-19 23:29:14 +00001017 Aliasee = GetOrCreateLLVMGlobal(AA->getAliasee(),
Rafael Espindola6a836702010-03-04 18:17:24 +00001018 llvm::PointerType::getUnqual(DeclTy), 0);
Joerg Sonnenberger4695f912012-10-16 17:45:27 +00001019
1020 llvm::GlobalValue* F = cast<llvm::GlobalValue>(Aliasee);
1021 F->setLinkage(llvm::Function::ExternalWeakLinkage);
1022 WeakRefReferences.insert(F);
Rafael Espindola6a836702010-03-04 18:17:24 +00001023
1024 return Aliasee;
1025}
1026
Chris Lattnerb4880ba2009-05-12 21:21:08 +00001027void CodeGenModule::EmitGlobal(GlobalDecl GD) {
Anders Carlsson4a6835e2009-09-10 23:38:47 +00001028 const ValueDecl *Global = cast<ValueDecl>(GD.getDecl());
Mike Stump1eb44332009-09-09 15:08:12 +00001029
Rafael Espindola6a836702010-03-04 18:17:24 +00001030 // Weak references don't produce any output by themselves.
1031 if (Global->hasAttr<WeakRefAttr>())
1032 return;
1033
Chris Lattnerbd532712009-03-22 21:47:11 +00001034 // If this is an alias definition (which otherwise looks like a declaration)
1035 // emit it now.
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +00001036 if (Global->hasAttr<AliasAttr>())
John McCallf746aa62010-03-19 23:29:14 +00001037 return EmitAliasDefinition(GD);
Daniel Dunbar219df662008-09-08 23:44:31 +00001038
Peter Collingbourned51e43a2011-10-06 18:29:46 +00001039 // If this is CUDA, be selective about which declarations we emit.
David Blaikie4e4d0842012-03-11 07:00:24 +00001040 if (LangOpts.CUDA) {
Peter Collingbourned51e43a2011-10-06 18:29:46 +00001041 if (CodeGenOpts.CUDAIsDevice) {
1042 if (!Global->hasAttr<CUDADeviceAttr>() &&
1043 !Global->hasAttr<CUDAGlobalAttr>() &&
1044 !Global->hasAttr<CUDAConstantAttr>() &&
1045 !Global->hasAttr<CUDASharedAttr>())
1046 return;
1047 } else {
1048 if (!Global->hasAttr<CUDAHostAttr>() && (
1049 Global->hasAttr<CUDADeviceAttr>() ||
1050 Global->hasAttr<CUDAConstantAttr>() ||
1051 Global->hasAttr<CUDASharedAttr>()))
1052 return;
1053 }
1054 }
1055
Chris Lattner67b00522009-03-21 09:44:56 +00001056 // Ignore declarations, they will be emitted on their first use.
Daniel Dunbar5e1e1f92009-03-19 08:27:24 +00001057 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(Global)) {
Daniel Dunbar73241df2009-02-13 21:18:01 +00001058 // Forward declarations are emitted lazily on first use.
Nick Lewyckydce67a72011-07-18 05:26:13 +00001059 if (!FD->doesThisDeclarationHaveABody()) {
1060 if (!FD->doesDeclarationForceExternallyVisibleDefinition())
1061 return;
1062
1063 const FunctionDecl *InlineDefinition = 0;
1064 FD->getBody(InlineDefinition);
1065
Chris Lattner5f9e2722011-07-23 10:55:15 +00001066 StringRef MangledName = getMangledName(GD);
Benjamin Kramer7e423922012-03-24 18:22:12 +00001067 DeferredDecls.erase(MangledName);
Nick Lewyckydce67a72011-07-18 05:26:13 +00001068 EmitGlobalDefinition(InlineDefinition);
Daniel Dunbar73241df2009-02-13 21:18:01 +00001069 return;
Nick Lewyckydce67a72011-07-18 05:26:13 +00001070 }
Daniel Dunbar02698712009-02-13 20:29:50 +00001071 } else {
1072 const VarDecl *VD = cast<VarDecl>(Global);
Daniel Dunbarbd012ff2008-07-29 23:18:29 +00001073 assert(VD->isFileVarDecl() && "Cannot emit local var decl as global.");
1074
Douglas Gregora9a55c02010-02-06 05:15:45 +00001075 if (VD->isThisDeclarationADefinition() != VarDecl::Definition)
Douglas Gregorb6c8c8b2009-04-21 17:11:58 +00001076 return;
Nate Begeman4c13b7a2008-04-20 06:29:50 +00001077 }
1078
Chris Lattner67b00522009-03-21 09:44:56 +00001079 // Defer code generation when possible if this is a static definition, inline
1080 // function etc. These we only want to emit if they are used.
Chris Lattner4357a822010-04-13 17:39:09 +00001081 if (!MayDeferGeneration(Global)) {
1082 // Emit the definition if it can't be deferred.
1083 EmitGlobalDefinition(GD);
Daniel Dunbarbd012ff2008-07-29 23:18:29 +00001084 return;
1085 }
John McCallbf40cb52010-07-15 23:40:35 +00001086
1087 // If we're deferring emission of a C++ variable with an
1088 // initializer, remember the order in which it appeared in the file.
David Blaikie4e4d0842012-03-11 07:00:24 +00001089 if (getLangOpts().CPlusPlus && isa<VarDecl>(Global) &&
John McCallbf40cb52010-07-15 23:40:35 +00001090 cast<VarDecl>(Global)->hasInit()) {
1091 DelayedCXXInitPosition[Global] = CXXGlobalInits.size();
1092 CXXGlobalInits.push_back(0);
1093 }
Chris Lattner4357a822010-04-13 17:39:09 +00001094
1095 // If the value has already been used, add it directly to the
1096 // DeferredDeclsToEmit list.
Chris Lattner5f9e2722011-07-23 10:55:15 +00001097 StringRef MangledName = getMangledName(GD);
Chris Lattner4357a822010-04-13 17:39:09 +00001098 if (GetGlobalValue(MangledName))
1099 DeferredDeclsToEmit.push_back(GD);
1100 else {
1101 // Otherwise, remember that we saw a deferred decl with this name. The
1102 // first use of the mangled name will cause it to move into
1103 // DeferredDeclsToEmit.
1104 DeferredDecls[MangledName] = GD;
1105 }
Nate Begeman4c13b7a2008-04-20 06:29:50 +00001106}
1107
Rafael Espindolaa411d2f2011-10-26 20:41:06 +00001108namespace {
1109 struct FunctionIsDirectlyRecursive :
1110 public RecursiveASTVisitor<FunctionIsDirectlyRecursive> {
1111 const StringRef Name;
Rafael Espindolabcf6b982011-12-19 14:41:01 +00001112 const Builtin::Context &BI;
Rafael Espindolaa411d2f2011-10-26 20:41:06 +00001113 bool Result;
Rafael Espindolabcf6b982011-12-19 14:41:01 +00001114 FunctionIsDirectlyRecursive(StringRef N, const Builtin::Context &C) :
1115 Name(N), BI(C), Result(false) {
Rafael Espindolaa411d2f2011-10-26 20:41:06 +00001116 }
1117 typedef RecursiveASTVisitor<FunctionIsDirectlyRecursive> Base;
1118
1119 bool TraverseCallExpr(CallExpr *E) {
Rafael Espindolabcf6b982011-12-19 14:41:01 +00001120 const FunctionDecl *FD = E->getDirectCallee();
1121 if (!FD)
Rafael Espindolaa411d2f2011-10-26 20:41:06 +00001122 return true;
Rafael Espindolabcf6b982011-12-19 14:41:01 +00001123 AsmLabelAttr *Attr = FD->getAttr<AsmLabelAttr>();
1124 if (Attr && Name == Attr->getLabel()) {
1125 Result = true;
1126 return false;
1127 }
1128 unsigned BuiltinID = FD->getBuiltinID();
1129 if (!BuiltinID)
Rafael Espindolaa411d2f2011-10-26 20:41:06 +00001130 return true;
Nick Lewyckyf6b56372012-01-18 03:41:19 +00001131 StringRef BuiltinName = BI.GetName(BuiltinID);
1132 if (BuiltinName.startswith("__builtin_") &&
1133 Name == BuiltinName.slice(strlen("__builtin_"), StringRef::npos)) {
Rafael Espindolaa411d2f2011-10-26 20:41:06 +00001134 Result = true;
1135 return false;
1136 }
1137 return true;
1138 }
1139 };
1140}
1141
Rafael Espindolabcf6b982011-12-19 14:41:01 +00001142// isTriviallyRecursive - Check if this function calls another
1143// decl that, because of the asm attribute or the other decl being a builtin,
1144// ends up pointing to itself.
Rafael Espindolaa411d2f2011-10-26 20:41:06 +00001145bool
Rafael Espindolabcf6b982011-12-19 14:41:01 +00001146CodeGenModule::isTriviallyRecursive(const FunctionDecl *FD) {
1147 StringRef Name;
1148 if (getCXXABI().getMangleContext().shouldMangleDeclName(FD)) {
Nick Lewycky22afacc2012-01-18 01:50:13 +00001149 // asm labels are a special kind of mangling we have to support.
Rafael Espindolabcf6b982011-12-19 14:41:01 +00001150 AsmLabelAttr *Attr = FD->getAttr<AsmLabelAttr>();
1151 if (!Attr)
1152 return false;
1153 Name = Attr->getLabel();
1154 } else {
1155 Name = FD->getName();
1156 }
Rafael Espindolaa411d2f2011-10-26 20:41:06 +00001157
Rafael Espindolabcf6b982011-12-19 14:41:01 +00001158 FunctionIsDirectlyRecursive Walker(Name, Context.BuiltinInfo);
1159 Walker.TraverseFunctionDecl(const_cast<FunctionDecl*>(FD));
Rafael Espindolaa411d2f2011-10-26 20:41:06 +00001160 return Walker.Result;
1161}
1162
1163bool
1164CodeGenModule::shouldEmitFunction(const FunctionDecl *F) {
1165 if (getFunctionLinkage(F) != llvm::Function::AvailableExternallyLinkage)
1166 return true;
Rafael Espindolacc4889f2011-10-28 20:43:56 +00001167 if (CodeGenOpts.OptimizationLevel == 0 &&
Michael J. Spenceradc6cbf2012-06-18 07:00:48 +00001168 !F->hasAttr<AlwaysInlineAttr>() && !F->hasAttr<ForceInlineAttr>())
Rafael Espindolaa411d2f2011-10-26 20:41:06 +00001169 return false;
1170 // PR9614. Avoid cases where the source code is lying to us. An available
1171 // externally function should have an equivalent function somewhere else,
1172 // but a function that calls itself is clearly not equivalent to the real
1173 // implementation.
1174 // This happens in glibc's btowc and in some configure checks.
Rafael Espindolabcf6b982011-12-19 14:41:01 +00001175 return !isTriviallyRecursive(F);
Rafael Espindolaa411d2f2011-10-26 20:41:06 +00001176}
1177
Chris Lattnerb4880ba2009-05-12 21:21:08 +00001178void CodeGenModule::EmitGlobalDefinition(GlobalDecl GD) {
Anders Carlsson4a6835e2009-09-10 23:38:47 +00001179 const ValueDecl *D = cast<ValueDecl>(GD.getDecl());
Mike Stump1eb44332009-09-09 15:08:12 +00001180
Dan Gohmancb421fa2010-04-19 16:39:44 +00001181 PrettyStackTraceDecl CrashInfo(const_cast<ValueDecl *>(D), D->getLocation(),
Anders Carlsson8e2efcc2009-10-27 14:32:27 +00001182 Context.getSourceManager(),
1183 "Generating code for declaration");
1184
Douglas Gregor44eac332010-07-13 06:02:28 +00001185 if (const FunctionDecl *Function = dyn_cast<FunctionDecl>(D)) {
1186 // At -O0, don't generate IR for functions with available_externally
1187 // linkage.
Rafael Espindolaa411d2f2011-10-26 20:41:06 +00001188 if (!shouldEmitFunction(Function))
Douglas Gregor44eac332010-07-13 06:02:28 +00001189 return;
Anders Carlsson7270ee42010-03-23 04:31:31 +00001190
Douglas Gregor44eac332010-07-13 06:02:28 +00001191 if (const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) {
Eli Friedman7dcdf5b2011-05-06 17:27:27 +00001192 // Make sure to emit the definition(s) before we emit the thunks.
1193 // This is necessary for the generation of certain thunks.
1194 if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(Method))
1195 EmitCXXConstructor(CD, GD.getCtorType());
1196 else if (const CXXDestructorDecl *DD =dyn_cast<CXXDestructorDecl>(Method))
1197 EmitCXXDestructor(DD, GD.getDtorType());
1198 else
1199 EmitGlobalFunctionDefinition(GD);
1200
Douglas Gregor44eac332010-07-13 06:02:28 +00001201 if (Method->isVirtual())
1202 getVTables().EmitThunks(GD);
1203
Eli Friedman7dcdf5b2011-05-06 17:27:27 +00001204 return;
Douglas Gregor44eac332010-07-13 06:02:28 +00001205 }
Chris Lattnerb5e81562010-04-13 17:57:11 +00001206
Chris Lattnerb5e81562010-04-13 17:57:11 +00001207 return EmitGlobalFunctionDefinition(GD);
Douglas Gregor44eac332010-07-13 06:02:28 +00001208 }
Chris Lattnerb5e81562010-04-13 17:57:11 +00001209
1210 if (const VarDecl *VD = dyn_cast<VarDecl>(D))
1211 return EmitGlobalVarDefinition(VD);
Chris Lattner4357a822010-04-13 17:39:09 +00001212
David Blaikieb219cfc2011-09-23 05:06:16 +00001213 llvm_unreachable("Invalid argument to EmitGlobalDefinition()");
Daniel Dunbarbd012ff2008-07-29 23:18:29 +00001214}
1215
Chris Lattner74391b42009-03-22 21:03:39 +00001216/// GetOrCreateLLVMFunction - If the specified mangled name is not in the
1217/// module, create and return an llvm Function with the specified type. If there
1218/// is something in the module with the specified name, return it potentially
1219/// bitcasted to the right type.
1220///
1221/// If D is non-null, it specifies a decl that correspond to this. This is used
1222/// to set the attributes on the function when it is first created.
John McCallf746aa62010-03-19 23:29:14 +00001223llvm::Constant *
Chris Lattner5f9e2722011-07-23 10:55:15 +00001224CodeGenModule::GetOrCreateLLVMFunction(StringRef MangledName,
Chris Lattner2acc6e32011-07-18 04:24:23 +00001225 llvm::Type *Ty,
John McCallf85e1932011-06-15 23:02:42 +00001226 GlobalDecl D, bool ForVTable,
Bill Wendling72390b32012-12-20 19:27:06 +00001227 llvm::Attribute ExtraAttrs) {
Chris Lattner0558e792009-03-21 09:25:43 +00001228 // Lookup the entry, lazily creating it if necessary.
John McCallf746aa62010-03-19 23:29:14 +00001229 llvm::GlobalValue *Entry = GetGlobalValue(MangledName);
Chris Lattner0558e792009-03-21 09:25:43 +00001230 if (Entry) {
Benjamin Kramerd48bcb22012-08-22 15:37:55 +00001231 if (WeakRefReferences.erase(Entry)) {
Rafael Espindola6a836702010-03-04 18:17:24 +00001232 const FunctionDecl *FD = cast_or_null<FunctionDecl>(D.getDecl());
1233 if (FD && !FD->hasAttr<WeakAttr>())
Anders Carlsson7270ee42010-03-23 04:31:31 +00001234 Entry->setLinkage(llvm::Function::ExternalLinkage);
Rafael Espindola6a836702010-03-04 18:17:24 +00001235 }
1236
Chris Lattner0558e792009-03-21 09:25:43 +00001237 if (Entry->getType()->getElementType() == Ty)
1238 return Entry;
Mike Stump1eb44332009-09-09 15:08:12 +00001239
Chris Lattner0558e792009-03-21 09:25:43 +00001240 // Make sure the result is of the correct type.
Chris Lattner9cbe4f02011-07-09 17:41:47 +00001241 return llvm::ConstantExpr::getBitCast(Entry, Ty->getPointerTo());
Chris Lattner0558e792009-03-21 09:25:43 +00001242 }
Mike Stump1eb44332009-09-09 15:08:12 +00001243
Eli Friedman654ad402009-11-09 05:07:37 +00001244 // This function doesn't have a complete type (for example, the return
1245 // type is an incomplete struct). Use a fake type instead, and make
1246 // sure not to try to set attributes.
1247 bool IsIncompleteFunction = false;
John McCall784f2112010-04-28 00:00:30 +00001248
Chris Lattner2acc6e32011-07-18 04:24:23 +00001249 llvm::FunctionType *FTy;
John McCall784f2112010-04-28 00:00:30 +00001250 if (isa<llvm::FunctionType>(Ty)) {
1251 FTy = cast<llvm::FunctionType>(Ty);
1252 } else {
John McCall0774cb82011-05-15 01:53:33 +00001253 FTy = llvm::FunctionType::get(VoidTy, false);
Eli Friedman654ad402009-11-09 05:07:37 +00001254 IsIncompleteFunction = true;
1255 }
Chris Lattnerbcaedae2010-06-30 19:14:05 +00001256
John McCall784f2112010-04-28 00:00:30 +00001257 llvm::Function *F = llvm::Function::Create(FTy,
Eli Friedman654ad402009-11-09 05:07:37 +00001258 llvm::Function::ExternalLinkage,
John McCallf746aa62010-03-19 23:29:14 +00001259 MangledName, &getModule());
1260 assert(F->getName() == MangledName && "name was uniqued!");
Eli Friedman654ad402009-11-09 05:07:37 +00001261 if (D.getDecl())
Anders Carlssonb2bcf1c2010-02-06 02:44:09 +00001262 SetFunctionAttributes(D, F, IsIncompleteFunction);
Bill Wendling909b6de2013-01-23 00:21:06 +00001263 if (ExtraAttrs.hasAttributes()) {
1264 llvm::AttrBuilder B(ExtraAttrs);
1265 F->addAttributes(llvm::AttributeSet::FunctionIndex,
1266 llvm::AttributeSet::get(VMContext,
1267 llvm::AttributeSet::FunctionIndex,
1268 B));
1269 }
Eli Friedman654ad402009-11-09 05:07:37 +00001270
Chris Lattner67b00522009-03-21 09:44:56 +00001271 // This is the first use or definition of a mangled name. If there is a
1272 // deferred decl with this name, remember that we need to emit it at the end
1273 // of the file.
John McCallf746aa62010-03-19 23:29:14 +00001274 llvm::StringMap<GlobalDecl>::iterator DDI = DeferredDecls.find(MangledName);
Chris Lattner67b00522009-03-21 09:44:56 +00001275 if (DDI != DeferredDecls.end()) {
1276 // Move the potentially referenced deferred decl to the DeferredDeclsToEmit
1277 // list, and remove it from DeferredDecls (since we don't need it anymore).
1278 DeferredDeclsToEmit.push_back(DDI->second);
1279 DeferredDecls.erase(DDI);
John McCallbfdcdc82010-12-15 04:00:32 +00001280
1281 // Otherwise, there are cases we have to worry about where we're
1282 // using a declaration for which we must emit a definition but where
1283 // we might not find a top-level definition:
1284 // - member functions defined inline in their classes
1285 // - friend functions defined inline in some class
1286 // - special member functions with implicit definitions
1287 // If we ever change our AST traversal to walk into class methods,
1288 // this will be unnecessary.
Anders Carlsson1faa89f2011-02-05 04:35:53 +00001289 //
1290 // We also don't emit a definition for a function if it's going to be an entry
1291 // in a vtable, unless it's already marked as used.
David Blaikie4e4d0842012-03-11 07:00:24 +00001292 } else if (getLangOpts().CPlusPlus && D.getDecl()) {
John McCallbfdcdc82010-12-15 04:00:32 +00001293 // Look for a declaration that's lexically in a record.
1294 const FunctionDecl *FD = cast<FunctionDecl>(D.getDecl());
Eli Friedmanb135f0f2012-07-02 21:05:30 +00001295 FD = FD->getMostRecentDecl();
John McCallbfdcdc82010-12-15 04:00:32 +00001296 do {
1297 if (isa<CXXRecordDecl>(FD->getLexicalDeclContext())) {
Anders Carlsson1faa89f2011-02-05 04:35:53 +00001298 if (FD->isImplicit() && !ForVTable) {
John McCallbfdcdc82010-12-15 04:00:32 +00001299 assert(FD->isUsed() && "Sema didn't mark implicit function as used!");
Douglas Gregora29bf412011-02-09 02:03:05 +00001300 DeferredDeclsToEmit.push_back(D.getWithDecl(FD));
John McCallbfdcdc82010-12-15 04:00:32 +00001301 break;
Sean Hunt10620eb2011-05-06 20:44:56 +00001302 } else if (FD->doesThisDeclarationHaveABody()) {
Douglas Gregora29bf412011-02-09 02:03:05 +00001303 DeferredDeclsToEmit.push_back(D.getWithDecl(FD));
John McCallbfdcdc82010-12-15 04:00:32 +00001304 break;
1305 }
Rafael Espindola7b9a5aa2010-03-02 21:28:26 +00001306 }
Douglas Gregoref96ee02012-01-14 16:38:05 +00001307 FD = FD->getPreviousDecl();
John McCallbfdcdc82010-12-15 04:00:32 +00001308 } while (FD);
Chris Lattner67b00522009-03-21 09:44:56 +00001309 }
Mike Stump1eb44332009-09-09 15:08:12 +00001310
John McCall784f2112010-04-28 00:00:30 +00001311 // Make sure the result is of the requested type.
1312 if (!IsIncompleteFunction) {
1313 assert(F->getType()->getElementType() == Ty);
1314 return F;
1315 }
1316
Chris Lattner9cbe4f02011-07-09 17:41:47 +00001317 llvm::Type *PTy = llvm::PointerType::getUnqual(Ty);
John McCall784f2112010-04-28 00:00:30 +00001318 return llvm::ConstantExpr::getBitCast(F, PTy);
Chris Lattner0558e792009-03-21 09:25:43 +00001319}
1320
Chris Lattner74391b42009-03-22 21:03:39 +00001321/// GetAddrOfFunction - Return the address of the given function. If Ty is
1322/// non-null, then this function will use the specified type if it has to
1323/// create it (this occurs when we see a definition of the function).
Chris Lattnerb4880ba2009-05-12 21:21:08 +00001324llvm::Constant *CodeGenModule::GetAddrOfFunction(GlobalDecl GD,
Chris Lattner2acc6e32011-07-18 04:24:23 +00001325 llvm::Type *Ty,
Anders Carlsson1faa89f2011-02-05 04:35:53 +00001326 bool ForVTable) {
Chris Lattner74391b42009-03-22 21:03:39 +00001327 // If there was no specific requested type, just convert it now.
1328 if (!Ty)
Anders Carlsson4a6835e2009-09-10 23:38:47 +00001329 Ty = getTypes().ConvertType(cast<ValueDecl>(GD.getDecl())->getType());
Chris Lattnerbcaedae2010-06-30 19:14:05 +00001330
Chris Lattner5f9e2722011-07-23 10:55:15 +00001331 StringRef MangledName = getMangledName(GD);
Anders Carlsson1faa89f2011-02-05 04:35:53 +00001332 return GetOrCreateLLVMFunction(MangledName, Ty, GD, ForVTable);
Chris Lattner74391b42009-03-22 21:03:39 +00001333}
Eli Friedman77ba7082008-05-30 19:50:47 +00001334
Chris Lattner74391b42009-03-22 21:03:39 +00001335/// CreateRuntimeFunction - Create a new runtime function with the specified
1336/// type and name.
1337llvm::Constant *
Chris Lattner2acc6e32011-07-18 04:24:23 +00001338CodeGenModule::CreateRuntimeFunction(llvm::FunctionType *FTy,
Chris Lattner5f9e2722011-07-23 10:55:15 +00001339 StringRef Name,
Bill Wendling72390b32012-12-20 19:27:06 +00001340 llvm::Attribute ExtraAttrs) {
John McCallf85e1932011-06-15 23:02:42 +00001341 return GetOrCreateLLVMFunction(Name, FTy, GlobalDecl(), /*ForVTable=*/false,
1342 ExtraAttrs);
Chris Lattner74391b42009-03-22 21:03:39 +00001343}
Daniel Dunbarbd012ff2008-07-29 23:18:29 +00001344
Richard Smitha9b21d22012-02-17 06:48:11 +00001345/// isTypeConstant - Determine whether an object of this type can be emitted
1346/// as a constant.
1347///
1348/// If ExcludeCtor is true, the duration when the object's constructor runs
1349/// will not be considered. The caller will need to verify that the object is
1350/// not written to during its construction.
1351bool CodeGenModule::isTypeConstant(QualType Ty, bool ExcludeCtor) {
1352 if (!Ty.isConstant(Context) && !Ty->isReferenceType())
Eli Friedman20e098b2009-12-11 21:23:03 +00001353 return false;
Richard Smitha9b21d22012-02-17 06:48:11 +00001354
David Blaikie4e4d0842012-03-11 07:00:24 +00001355 if (Context.getLangOpts().CPlusPlus) {
Richard Smitha9b21d22012-02-17 06:48:11 +00001356 if (const CXXRecordDecl *Record
1357 = Context.getBaseElementType(Ty)->getAsCXXRecordDecl())
1358 return ExcludeCtor && !Record->hasMutableFields() &&
1359 Record->hasTrivialDestructor();
Eli Friedman20e098b2009-12-11 21:23:03 +00001360 }
Richard Smitha9b21d22012-02-17 06:48:11 +00001361
Eli Friedman20e098b2009-12-11 21:23:03 +00001362 return true;
1363}
1364
Chris Lattner74391b42009-03-22 21:03:39 +00001365/// GetOrCreateLLVMGlobal - If the specified mangled name is not in the module,
1366/// create and return an llvm GlobalVariable with the specified type. If there
1367/// is something in the module with the specified name, return it potentially
1368/// bitcasted to the right type.
1369///
1370/// If D is non-null, it specifies a decl that correspond to this. This is used
1371/// to set the attributes on the global when it is first created.
John McCallf746aa62010-03-19 23:29:14 +00001372llvm::Constant *
Chris Lattner5f9e2722011-07-23 10:55:15 +00001373CodeGenModule::GetOrCreateLLVMGlobal(StringRef MangledName,
Chris Lattner2acc6e32011-07-18 04:24:23 +00001374 llvm::PointerType *Ty,
Rafael Espindolac532b502011-01-18 21:07:57 +00001375 const VarDecl *D,
1376 bool UnnamedAddr) {
Daniel Dunbar3c827a72008-08-05 23:31:02 +00001377 // Lookup the entry, lazily creating it if necessary.
John McCallf746aa62010-03-19 23:29:14 +00001378 llvm::GlobalValue *Entry = GetGlobalValue(MangledName);
Chris Lattner99b53612009-03-21 08:03:33 +00001379 if (Entry) {
Benjamin Kramerd48bcb22012-08-22 15:37:55 +00001380 if (WeakRefReferences.erase(Entry)) {
Rafael Espindola6a836702010-03-04 18:17:24 +00001381 if (D && !D->hasAttr<WeakAttr>())
Anders Carlsson7270ee42010-03-23 04:31:31 +00001382 Entry->setLinkage(llvm::Function::ExternalLinkage);
Rafael Espindola6a836702010-03-04 18:17:24 +00001383 }
1384
Rafael Espindolac532b502011-01-18 21:07:57 +00001385 if (UnnamedAddr)
1386 Entry->setUnnamedAddr(true);
1387
Chris Lattner74391b42009-03-22 21:03:39 +00001388 if (Entry->getType() == Ty)
Chris Lattner570585c2009-03-21 09:16:30 +00001389 return Entry;
Mike Stump1eb44332009-09-09 15:08:12 +00001390
Chris Lattner99b53612009-03-21 08:03:33 +00001391 // Make sure the result is of the correct type.
Owen Anderson3c4972d2009-07-29 18:54:39 +00001392 return llvm::ConstantExpr::getBitCast(Entry, Ty);
Daniel Dunbar49988882009-01-13 02:25:00 +00001393 }
Mike Stump1eb44332009-09-09 15:08:12 +00001394
Chris Lattner67b00522009-03-21 09:44:56 +00001395 // This is the first use or definition of a mangled name. If there is a
1396 // deferred decl with this name, remember that we need to emit it at the end
1397 // of the file.
John McCallf746aa62010-03-19 23:29:14 +00001398 llvm::StringMap<GlobalDecl>::iterator DDI = DeferredDecls.find(MangledName);
Chris Lattner67b00522009-03-21 09:44:56 +00001399 if (DDI != DeferredDecls.end()) {
1400 // Move the potentially referenced deferred decl to the DeferredDeclsToEmit
1401 // list, and remove it from DeferredDecls (since we don't need it anymore).
1402 DeferredDeclsToEmit.push_back(DDI->second);
1403 DeferredDecls.erase(DDI);
1404 }
Mike Stump1eb44332009-09-09 15:08:12 +00001405
Peter Collingbourne4dc34eb2012-05-20 21:08:35 +00001406 unsigned AddrSpace = GetGlobalVarAddressSpace(D, Ty->getAddressSpace());
Mike Stump1eb44332009-09-09 15:08:12 +00001407 llvm::GlobalVariable *GV =
1408 new llvm::GlobalVariable(getModule(), Ty->getElementType(), false,
Chris Lattner99b53612009-03-21 08:03:33 +00001409 llvm::GlobalValue::ExternalLinkage,
John McCallf746aa62010-03-19 23:29:14 +00001410 0, MangledName, 0,
Hans Wennborg5e2d5de2012-06-23 11:51:46 +00001411 llvm::GlobalVariable::NotThreadLocal, AddrSpace);
Chris Lattner99b53612009-03-21 08:03:33 +00001412
1413 // Handle things which are present even on external declarations.
Chris Lattner74391b42009-03-22 21:03:39 +00001414 if (D) {
Mike Stumpf5408fe2009-05-16 07:57:57 +00001415 // FIXME: This code is overly simple and should be merged with other global
1416 // handling.
Richard Smitha9b21d22012-02-17 06:48:11 +00001417 GV->setConstant(isTypeConstant(D->getType(), false));
Chris Lattner99b53612009-03-21 08:03:33 +00001418
John McCall110e8e52010-10-29 22:22:43 +00001419 // Set linkage and visibility in case we never see a definition.
John McCallaf146032010-10-30 11:50:40 +00001420 NamedDecl::LinkageInfo LV = D->getLinkageAndVisibility();
1421 if (LV.linkage() != ExternalLinkage) {
John McCall15e310a2011-02-19 02:53:41 +00001422 // Don't set internal linkage on declarations.
John McCall110e8e52010-10-29 22:22:43 +00001423 } else {
1424 if (D->hasAttr<DLLImportAttr>())
1425 GV->setLinkage(llvm::GlobalValue::DLLImportLinkage);
Douglas Gregor0a0d2b12011-03-23 00:50:03 +00001426 else if (D->hasAttr<WeakAttr>() || D->isWeakImported())
John McCall110e8e52010-10-29 22:22:43 +00001427 GV->setLinkage(llvm::GlobalValue::ExternalWeakLinkage);
Chris Lattner99b53612009-03-21 08:03:33 +00001428
John McCallaf146032010-10-30 11:50:40 +00001429 // Set visibility on a declaration only if it's explicit.
1430 if (LV.visibilityExplicit())
1431 GV->setVisibility(GetLLVMVisibility(LV.visibility()));
John McCall110e8e52010-10-29 22:22:43 +00001432 }
Eli Friedman56ebe502009-04-19 21:05:03 +00001433
Hans Wennborgde981f32012-06-28 08:01:44 +00001434 if (D->isThreadSpecified())
1435 setTLSMode(GV, *D);
Chris Lattner74391b42009-03-22 21:03:39 +00001436 }
Mike Stump1eb44332009-09-09 15:08:12 +00001437
Peter Collingbourne4dc34eb2012-05-20 21:08:35 +00001438 if (AddrSpace != Ty->getAddressSpace())
1439 return llvm::ConstantExpr::getBitCast(GV, Ty);
1440 else
1441 return GV;
Daniel Dunbarbd012ff2008-07-29 23:18:29 +00001442}
1443
Chris Lattner74391b42009-03-22 21:03:39 +00001444
Anders Carlsson3bd62022011-01-29 18:20:20 +00001445llvm::GlobalVariable *
Chris Lattner5f9e2722011-07-23 10:55:15 +00001446CodeGenModule::CreateOrReplaceCXXRuntimeVariable(StringRef Name,
Chris Lattner2acc6e32011-07-18 04:24:23 +00001447 llvm::Type *Ty,
Anders Carlsson3bd62022011-01-29 18:20:20 +00001448 llvm::GlobalValue::LinkageTypes Linkage) {
1449 llvm::GlobalVariable *GV = getModule().getNamedGlobal(Name);
1450 llvm::GlobalVariable *OldGV = 0;
1451
1452
1453 if (GV) {
1454 // Check if the variable has the right type.
1455 if (GV->getType()->getElementType() == Ty)
1456 return GV;
1457
1458 // Because C++ name mangling, the only way we can end up with an already
1459 // existing global with the same name is if it has been declared extern "C".
Nico Weberc5f80462012-10-11 10:13:44 +00001460 assert(GV->isDeclaration() && "Declaration has wrong type!");
Anders Carlsson3bd62022011-01-29 18:20:20 +00001461 OldGV = GV;
1462 }
1463
1464 // Create a new variable.
1465 GV = new llvm::GlobalVariable(getModule(), Ty, /*isConstant=*/true,
1466 Linkage, 0, Name);
1467
1468 if (OldGV) {
1469 // Replace occurrences of the old variable if needed.
1470 GV->takeName(OldGV);
1471
1472 if (!OldGV->use_empty()) {
1473 llvm::Constant *NewPtrForOldDecl =
1474 llvm::ConstantExpr::getBitCast(GV, OldGV->getType());
1475 OldGV->replaceAllUsesWith(NewPtrForOldDecl);
1476 }
1477
1478 OldGV->eraseFromParent();
1479 }
1480
1481 return GV;
1482}
1483
Chris Lattner74391b42009-03-22 21:03:39 +00001484/// GetAddrOfGlobalVar - Return the llvm::Constant for the address of the
1485/// given global variable. If Ty is non-null and if the global doesn't exist,
Eric Christopher0ff258b2012-04-16 23:55:04 +00001486/// then it will be created with the specified type instead of whatever the
Chris Lattner74391b42009-03-22 21:03:39 +00001487/// normal requested type would be.
1488llvm::Constant *CodeGenModule::GetAddrOfGlobalVar(const VarDecl *D,
Chris Lattner2acc6e32011-07-18 04:24:23 +00001489 llvm::Type *Ty) {
Chris Lattner74391b42009-03-22 21:03:39 +00001490 assert(D->hasGlobalStorage() && "Not a global variable");
1491 QualType ASTTy = D->getType();
1492 if (Ty == 0)
1493 Ty = getTypes().ConvertTypeForMem(ASTTy);
Mike Stump1eb44332009-09-09 15:08:12 +00001494
Chris Lattner2acc6e32011-07-18 04:24:23 +00001495 llvm::PointerType *PTy =
Peter Collingbourne207f4d82011-03-18 22:38:29 +00001496 llvm::PointerType::get(Ty, getContext().getTargetAddressSpace(ASTTy));
John McCallf746aa62010-03-19 23:29:14 +00001497
Chris Lattner5f9e2722011-07-23 10:55:15 +00001498 StringRef MangledName = getMangledName(D);
John McCallf746aa62010-03-19 23:29:14 +00001499 return GetOrCreateLLVMGlobal(MangledName, PTy, D);
Chris Lattner74391b42009-03-22 21:03:39 +00001500}
1501
1502/// CreateRuntimeVariable - Create a new runtime global variable with the
1503/// specified type and name.
1504llvm::Constant *
Chris Lattner2acc6e32011-07-18 04:24:23 +00001505CodeGenModule::CreateRuntimeVariable(llvm::Type *Ty,
Chris Lattner5f9e2722011-07-23 10:55:15 +00001506 StringRef Name) {
John McCall1de4d4e2011-04-07 08:22:57 +00001507 return GetOrCreateLLVMGlobal(Name, llvm::PointerType::getUnqual(Ty), 0,
Rafael Espindolac532b502011-01-18 21:07:57 +00001508 true);
Chris Lattner74391b42009-03-22 21:03:39 +00001509}
1510
Daniel Dunbar03f5ad92009-04-15 22:08:45 +00001511void CodeGenModule::EmitTentativeDefinition(const VarDecl *D) {
1512 assert(!D->getInit() && "Cannot emit definite definitions here!");
1513
Douglas Gregor7520bd12009-04-21 19:28:58 +00001514 if (MayDeferGeneration(D)) {
1515 // If we have not seen a reference to this variable yet, place it
1516 // into the deferred declarations table to be emitted if needed
1517 // later.
Chris Lattner5f9e2722011-07-23 10:55:15 +00001518 StringRef MangledName = getMangledName(D);
John McCallf746aa62010-03-19 23:29:14 +00001519 if (!GetGlobalValue(MangledName)) {
Anders Carlsson555b4bb2009-09-10 23:43:36 +00001520 DeferredDecls[MangledName] = D;
Daniel Dunbar03f5ad92009-04-15 22:08:45 +00001521 return;
Douglas Gregor7520bd12009-04-21 19:28:58 +00001522 }
1523 }
1524
1525 // The tentative definition is the only definition.
Daniel Dunbar03f5ad92009-04-15 22:08:45 +00001526 EmitGlobalVarDefinition(D);
1527}
1528
Douglas Gregor6fb745b2010-05-13 16:44:06 +00001529void CodeGenModule::EmitVTable(CXXRecordDecl *Class, bool DefinitionRequired) {
1530 if (DefinitionRequired)
Charles Davis9ee494f2012-06-23 23:44:00 +00001531 getCXXABI().EmitVTables(Class);
Douglas Gregor6fb745b2010-05-13 16:44:06 +00001532}
1533
Douglas Gregor4b0f21c2010-01-06 20:27:16 +00001534llvm::GlobalVariable::LinkageTypes
Anders Carlsson046c2942010-04-17 20:15:18 +00001535CodeGenModule::getVTableLinkage(const CXXRecordDecl *RD) {
Eli Friedmancb5d2d02011-06-10 21:53:06 +00001536 if (RD->getLinkage() != ExternalLinkage)
Douglas Gregordffb8012010-01-06 22:00:56 +00001537 return llvm::GlobalVariable::InternalLinkage;
1538
1539 if (const CXXMethodDecl *KeyFunction
1540 = RD->getASTContext().getKeyFunction(RD)) {
1541 // If this class has a key function, use that to determine the linkage of
1542 // the vtable.
Douglas Gregor4b0f21c2010-01-06 20:27:16 +00001543 const FunctionDecl *Def = 0;
Argyrios Kyrtzidis06a54a32010-07-07 11:31:19 +00001544 if (KeyFunction->hasBody(Def))
Douglas Gregor4b0f21c2010-01-06 20:27:16 +00001545 KeyFunction = cast<CXXMethodDecl>(Def);
Douglas Gregordffb8012010-01-06 22:00:56 +00001546
Douglas Gregor4b0f21c2010-01-06 20:27:16 +00001547 switch (KeyFunction->getTemplateSpecializationKind()) {
1548 case TSK_Undeclared:
1549 case TSK_ExplicitSpecialization:
Anders Carlsson6d7f8472011-01-30 20:45:54 +00001550 // When compiling with optimizations turned on, we emit all vtables,
1551 // even if the key function is not defined in the current translation
1552 // unit. If this is the case, use available_externally linkage.
1553 if (!Def && CodeGenOpts.OptimizationLevel)
1554 return llvm::GlobalVariable::AvailableExternallyLinkage;
1555
Douglas Gregor4b0f21c2010-01-06 20:27:16 +00001556 if (KeyFunction->isInlined())
David Blaikie4e4d0842012-03-11 07:00:24 +00001557 return !Context.getLangOpts().AppleKext ?
Fariborz Jahanian142f9e92011-02-04 00:01:24 +00001558 llvm::GlobalVariable::LinkOnceODRLinkage :
1559 llvm::Function::InternalLinkage;
Douglas Gregor4b0f21c2010-01-06 20:27:16 +00001560
1561 return llvm::GlobalVariable::ExternalLinkage;
1562
1563 case TSK_ImplicitInstantiation:
David Blaikie4e4d0842012-03-11 07:00:24 +00001564 return !Context.getLangOpts().AppleKext ?
Fariborz Jahanian142f9e92011-02-04 00:01:24 +00001565 llvm::GlobalVariable::LinkOnceODRLinkage :
1566 llvm::Function::InternalLinkage;
Anders Carlssonf502d932011-01-24 00:46:19 +00001567
Douglas Gregor4b0f21c2010-01-06 20:27:16 +00001568 case TSK_ExplicitInstantiationDefinition:
David Blaikie4e4d0842012-03-11 07:00:24 +00001569 return !Context.getLangOpts().AppleKext ?
Fariborz Jahanian142f9e92011-02-04 00:01:24 +00001570 llvm::GlobalVariable::WeakODRLinkage :
1571 llvm::Function::InternalLinkage;
Anders Carlssonf502d932011-01-24 00:46:19 +00001572
Douglas Gregor4b0f21c2010-01-06 20:27:16 +00001573 case TSK_ExplicitInstantiationDeclaration:
1574 // FIXME: Use available_externally linkage. However, this currently
1575 // breaks LLVM's build due to undefined symbols.
1576 // return llvm::GlobalVariable::AvailableExternallyLinkage;
David Blaikie4e4d0842012-03-11 07:00:24 +00001577 return !Context.getLangOpts().AppleKext ?
Fariborz Jahanian142f9e92011-02-04 00:01:24 +00001578 llvm::GlobalVariable::LinkOnceODRLinkage :
1579 llvm::Function::InternalLinkage;
Douglas Gregor4b0f21c2010-01-06 20:27:16 +00001580 }
Douglas Gregordffb8012010-01-06 22:00:56 +00001581 }
1582
David Blaikie4e4d0842012-03-11 07:00:24 +00001583 if (Context.getLangOpts().AppleKext)
Fariborz Jahanian53bad4e2011-02-04 00:32:39 +00001584 return llvm::Function::InternalLinkage;
1585
Douglas Gregordffb8012010-01-06 22:00:56 +00001586 switch (RD->getTemplateSpecializationKind()) {
1587 case TSK_Undeclared:
1588 case TSK_ExplicitSpecialization:
1589 case TSK_ImplicitInstantiation:
Douglas Gregordffb8012010-01-06 22:00:56 +00001590 // FIXME: Use available_externally linkage. However, this currently
1591 // breaks LLVM's build due to undefined symbols.
1592 // return llvm::GlobalVariable::AvailableExternallyLinkage;
Fariborz Jahanian142f9e92011-02-04 00:01:24 +00001593 case TSK_ExplicitInstantiationDeclaration:
Fariborz Jahanian53bad4e2011-02-04 00:32:39 +00001594 return llvm::GlobalVariable::LinkOnceODRLinkage;
Fariborz Jahanian142f9e92011-02-04 00:01:24 +00001595
1596 case TSK_ExplicitInstantiationDefinition:
Fariborz Jahanian53bad4e2011-02-04 00:32:39 +00001597 return llvm::GlobalVariable::WeakODRLinkage;
Douglas Gregor4b0f21c2010-01-06 20:27:16 +00001598 }
David Blaikie30263482012-01-20 21:50:17 +00001599
1600 llvm_unreachable("Invalid TemplateSpecializationKind!");
Douglas Gregor4b0f21c2010-01-06 20:27:16 +00001601}
1602
Chris Lattner2acc6e32011-07-18 04:24:23 +00001603CharUnits CodeGenModule::GetTargetTypeStoreSize(llvm::Type *Ty) const {
Ken Dyck06f486e2011-01-18 02:01:14 +00001604 return Context.toCharUnitsFromBits(
Micah Villmow25a6a842012-10-08 16:25:52 +00001605 TheDataLayout.getTypeStoreSizeInBits(Ty));
Ken Dyck687cc4a2010-01-26 13:48:07 +00001606}
1607
Sebastian Redl19b1a6e2012-02-25 20:51:20 +00001608llvm::Constant *
1609CodeGenModule::MaybeEmitGlobalStdInitializerListInitializer(const VarDecl *D,
1610 const Expr *rawInit) {
1611 ArrayRef<ExprWithCleanups::CleanupObject> cleanups;
1612 if (const ExprWithCleanups *withCleanups =
1613 dyn_cast<ExprWithCleanups>(rawInit)) {
1614 cleanups = withCleanups->getObjects();
1615 rawInit = withCleanups->getSubExpr();
1616 }
1617
1618 const InitListExpr *init = dyn_cast<InitListExpr>(rawInit);
1619 if (!init || !init->initializesStdInitializerList() ||
1620 init->getNumInits() == 0)
1621 return 0;
1622
1623 ASTContext &ctx = getContext();
Sebastian Redl19b1a6e2012-02-25 20:51:20 +00001624 unsigned numInits = init->getNumInits();
Sebastian Redl062a82c2012-02-27 23:20:01 +00001625 // FIXME: This check is here because we would otherwise silently miscompile
1626 // nested global std::initializer_lists. Better would be to have a real
1627 // implementation.
1628 for (unsigned i = 0; i < numInits; ++i) {
1629 const InitListExpr *inner = dyn_cast<InitListExpr>(init->getInit(i));
1630 if (inner && inner->initializesStdInitializerList()) {
1631 ErrorUnsupported(inner, "nested global std::initializer_list");
1632 return 0;
1633 }
1634 }
1635
1636 // Synthesize a fake VarDecl for the array and initialize that.
Sebastian Redl19b1a6e2012-02-25 20:51:20 +00001637 QualType elementType = init->getInit(0)->getType();
1638 llvm::APInt numElements(ctx.getTypeSize(ctx.getSizeType()), numInits);
1639 QualType arrayType = ctx.getConstantArrayType(elementType, numElements,
1640 ArrayType::Normal, 0);
1641
1642 IdentifierInfo *name = &ctx.Idents.get(D->getNameAsString() + "__initlist");
1643 TypeSourceInfo *sourceInfo = ctx.getTrivialTypeSourceInfo(
1644 arrayType, D->getLocation());
1645 VarDecl *backingArray = VarDecl::Create(ctx, const_cast<DeclContext*>(
1646 D->getDeclContext()),
1647 D->getLocStart(), D->getLocation(),
1648 name, arrayType, sourceInfo,
1649 SC_Static, SC_Static);
1650
1651 // Now clone the InitListExpr to initialize the array instead.
1652 // Incredible hack: we want to use the existing InitListExpr here, so we need
1653 // to tell it that it no longer initializes a std::initializer_list.
Benjamin Kramer3b6bef92012-08-24 11:54:20 +00001654 ArrayRef<Expr*> Inits(const_cast<InitListExpr*>(init)->getInits(),
1655 init->getNumInits());
1656 Expr *arrayInit = new (ctx) InitListExpr(ctx, init->getLBraceLoc(), Inits,
1657 init->getRBraceLoc());
Sebastian Redl19b1a6e2012-02-25 20:51:20 +00001658 arrayInit->setType(arrayType);
1659
1660 if (!cleanups.empty())
1661 arrayInit = ExprWithCleanups::Create(ctx, arrayInit, cleanups);
1662
1663 backingArray->setInit(arrayInit);
1664
1665 // Emit the definition of the array.
1666 EmitGlobalVarDefinition(backingArray);
1667
1668 // Inspect the initializer list to validate it and determine its type.
1669 // FIXME: doing this every time is probably inefficient; caching would be nice
1670 RecordDecl *record = init->getType()->castAs<RecordType>()->getDecl();
1671 RecordDecl::field_iterator field = record->field_begin();
1672 if (field == record->field_end()) {
1673 ErrorUnsupported(D, "weird std::initializer_list");
1674 return 0;
1675 }
1676 QualType elementPtr = ctx.getPointerType(elementType.withConst());
1677 // Start pointer.
1678 if (!ctx.hasSameType(field->getType(), elementPtr)) {
1679 ErrorUnsupported(D, "weird std::initializer_list");
1680 return 0;
1681 }
1682 ++field;
1683 if (field == record->field_end()) {
1684 ErrorUnsupported(D, "weird std::initializer_list");
1685 return 0;
1686 }
1687 bool isStartEnd = false;
1688 if (ctx.hasSameType(field->getType(), elementPtr)) {
1689 // End pointer.
1690 isStartEnd = true;
1691 } else if(!ctx.hasSameType(field->getType(), ctx.getSizeType())) {
1692 ErrorUnsupported(D, "weird std::initializer_list");
1693 return 0;
1694 }
1695
1696 // Now build an APValue representing the std::initializer_list.
1697 APValue initListValue(APValue::UninitStruct(), 0, 2);
1698 APValue &startField = initListValue.getStructField(0);
1699 APValue::LValuePathEntry startOffsetPathEntry;
1700 startOffsetPathEntry.ArrayIndex = 0;
1701 startField = APValue(APValue::LValueBase(backingArray),
1702 CharUnits::fromQuantity(0),
1703 llvm::makeArrayRef(startOffsetPathEntry),
1704 /*IsOnePastTheEnd=*/false, 0);
1705
1706 if (isStartEnd) {
1707 APValue &endField = initListValue.getStructField(1);
1708 APValue::LValuePathEntry endOffsetPathEntry;
1709 endOffsetPathEntry.ArrayIndex = numInits;
1710 endField = APValue(APValue::LValueBase(backingArray),
1711 ctx.getTypeSizeInChars(elementType) * numInits,
1712 llvm::makeArrayRef(endOffsetPathEntry),
1713 /*IsOnePastTheEnd=*/true, 0);
1714 } else {
1715 APValue &sizeField = initListValue.getStructField(1);
1716 sizeField = APValue(llvm::APSInt(numElements));
1717 }
1718
1719 // Emit the constant for the initializer_list.
Richard Smitha3ca41f2012-03-02 23:27:11 +00001720 llvm::Constant *llvmInit =
1721 EmitConstantValueForMemory(initListValue, D->getType());
Sebastian Redl19b1a6e2012-02-25 20:51:20 +00001722 assert(llvmInit && "failed to initialize as constant");
1723 return llvmInit;
1724}
1725
Peter Collingbourne4dc34eb2012-05-20 21:08:35 +00001726unsigned CodeGenModule::GetGlobalVarAddressSpace(const VarDecl *D,
1727 unsigned AddrSpace) {
1728 if (LangOpts.CUDA && CodeGenOpts.CUDAIsDevice) {
1729 if (D->hasAttr<CUDAConstantAttr>())
1730 AddrSpace = getContext().getTargetAddressSpace(LangAS::cuda_constant);
1731 else if (D->hasAttr<CUDASharedAttr>())
1732 AddrSpace = getContext().getTargetAddressSpace(LangAS::cuda_shared);
1733 else
1734 AddrSpace = getContext().getTargetAddressSpace(LangAS::cuda_device);
1735 }
1736
1737 return AddrSpace;
1738}
1739
Daniel Dunbarbd012ff2008-07-29 23:18:29 +00001740void CodeGenModule::EmitGlobalVarDefinition(const VarDecl *D) {
Chris Lattner8f32f712007-07-14 00:23:28 +00001741 llvm::Constant *Init = 0;
Eli Friedman77ba7082008-05-30 19:50:47 +00001742 QualType ASTTy = D->getType();
Richard Smith7ca48502012-02-13 22:16:19 +00001743 CXXRecordDecl *RD = ASTTy->getBaseElementTypeUnsafe()->getAsCXXRecordDecl();
1744 bool NeedsGlobalCtor = false;
1745 bool NeedsGlobalDtor = RD && !RD->hasTrivialDestructor();
Mike Stump1eb44332009-09-09 15:08:12 +00001746
Richard Smith2d6a5672012-01-14 04:30:29 +00001747 const VarDecl *InitDecl;
1748 const Expr *InitExpr = D->getAnyInitializer(InitDecl);
Sebastian Redl19b1a6e2012-02-25 20:51:20 +00001749
Anders Carlsson3bb92692010-01-26 17:43:42 +00001750 if (!InitExpr) {
Eli Friedmancd5f4aa2008-05-30 20:39:54 +00001751 // This is a tentative definition; tentative definitions are
Daniel Dunbar03f5ad92009-04-15 22:08:45 +00001752 // implicitly initialized with { 0 }.
1753 //
1754 // Note that tentative definitions are only emitted at the end of
1755 // a translation unit, so they should never have incomplete
1756 // type. In addition, EmitTentativeDefinition makes sure that we
1757 // never attempt to emit a tentative definition if a real one
1758 // exists. A use may still exists, however, so we still may need
1759 // to do a RAUW.
1760 assert(!ASTTy->isIncompleteType() && "Unexpected incomplete type");
Anders Carlssonb0d0ea02009-08-02 21:18:22 +00001761 Init = EmitNullConstant(D->getType());
Eli Friedman77ba7082008-05-30 19:50:47 +00001762 } else {
Sebastian Redl19b1a6e2012-02-25 20:51:20 +00001763 // If this is a std::initializer_list, emit the special initializer.
1764 Init = MaybeEmitGlobalStdInitializerListInitializer(D, InitExpr);
1765 // An empty init list will perform zero-initialization, which happens
1766 // to be exactly what we want.
1767 // FIXME: It does so in a global constructor, which is *not* what we
1768 // want.
1769
Fariborz Jahanian4904bf42012-06-26 16:06:38 +00001770 if (!Init) {
1771 initializedGlobalDecl = GlobalDecl(D);
Sebastian Redl19b1a6e2012-02-25 20:51:20 +00001772 Init = EmitConstantInit(*InitDecl);
Fariborz Jahanian4904bf42012-06-26 16:06:38 +00001773 }
Eli Friedman6e656f42009-02-20 01:18:21 +00001774 if (!Init) {
Anders Carlsson3bb92692010-01-26 17:43:42 +00001775 QualType T = InitExpr->getType();
Douglas Gregorc446d182010-05-05 20:15:55 +00001776 if (D->getType()->isReferenceType())
1777 T = D->getType();
Richard Smith2d6a5672012-01-14 04:30:29 +00001778
David Blaikie4e4d0842012-03-11 07:00:24 +00001779 if (getLangOpts().CPlusPlus) {
Anders Carlsson89ed31d2009-08-08 23:24:23 +00001780 Init = EmitNullConstant(T);
Richard Smith7ca48502012-02-13 22:16:19 +00001781 NeedsGlobalCtor = true;
Anders Carlsson89ed31d2009-08-08 23:24:23 +00001782 } else {
1783 ErrorUnsupported(D, "static initializer");
1784 Init = llvm::UndefValue::get(getTypes().ConvertType(T));
1785 }
John McCallbf40cb52010-07-15 23:40:35 +00001786 } else {
1787 // We don't need an initializer, so remove the entry for the delayed
Richard Smith7ca48502012-02-13 22:16:19 +00001788 // initializer position (just in case this entry was delayed) if we
1789 // also don't need to register a destructor.
David Blaikie4e4d0842012-03-11 07:00:24 +00001790 if (getLangOpts().CPlusPlus && !NeedsGlobalDtor)
John McCallbf40cb52010-07-15 23:40:35 +00001791 DelayedCXXInitPosition.erase(D);
Eli Friedman6e656f42009-02-20 01:18:21 +00001792 }
Eli Friedman77ba7082008-05-30 19:50:47 +00001793 }
Eli Friedman77ba7082008-05-30 19:50:47 +00001794
Chris Lattner2acc6e32011-07-18 04:24:23 +00001795 llvm::Type* InitType = Init->getType();
Chris Lattner570585c2009-03-21 09:16:30 +00001796 llvm::Constant *Entry = GetAddrOfGlobalVar(D, InitType);
Mike Stump1eb44332009-09-09 15:08:12 +00001797
Chris Lattner570585c2009-03-21 09:16:30 +00001798 // Strip off a bitcast if we got one back.
1799 if (llvm::ConstantExpr *CE = dyn_cast<llvm::ConstantExpr>(Entry)) {
Chris Lattner9d4a15f2009-07-16 16:48:25 +00001800 assert(CE->getOpcode() == llvm::Instruction::BitCast ||
1801 // all zero index gep.
1802 CE->getOpcode() == llvm::Instruction::GetElementPtr);
Chris Lattner570585c2009-03-21 09:16:30 +00001803 Entry = CE->getOperand(0);
1804 }
Mike Stump1eb44332009-09-09 15:08:12 +00001805
Chris Lattner570585c2009-03-21 09:16:30 +00001806 // Entry is now either a Function or GlobalVariable.
1807 llvm::GlobalVariable *GV = dyn_cast<llvm::GlobalVariable>(Entry);
Mike Stump1eb44332009-09-09 15:08:12 +00001808
Chris Lattner570585c2009-03-21 09:16:30 +00001809 // We have a definition after a declaration with the wrong type.
1810 // We must make a new GlobalVariable* and update everything that used OldGV
1811 // (a declaration or tentative definition) with the new GlobalVariable*
1812 // (which will be a definition).
1813 //
1814 // This happens if there is a prototype for a global (e.g.
1815 // "extern int x[];") and then a definition of a different type (e.g.
1816 // "int x[10];"). This also happens when an initializer has a different type
1817 // from the type of the global (this happens with unions).
Chris Lattner570585c2009-03-21 09:16:30 +00001818 if (GV == 0 ||
1819 GV->getType()->getElementType() != InitType ||
Peter Collingbourne207f4d82011-03-18 22:38:29 +00001820 GV->getType()->getAddressSpace() !=
Peter Collingbourne4dc34eb2012-05-20 21:08:35 +00001821 GetGlobalVarAddressSpace(D, getContext().getTargetAddressSpace(ASTTy))) {
Mike Stump1eb44332009-09-09 15:08:12 +00001822
John McCallf746aa62010-03-19 23:29:14 +00001823 // Move the old entry aside so that we'll create a new one.
Chris Lattner5f9e2722011-07-23 10:55:15 +00001824 Entry->setName(StringRef());
Daniel Dunbar232350d2009-02-19 05:36:41 +00001825
Chris Lattner570585c2009-03-21 09:16:30 +00001826 // Make a new global with the correct type, this is now guaranteed to work.
1827 GV = cast<llvm::GlobalVariable>(GetAddrOfGlobalVar(D, InitType));
Chris Lattner0558e792009-03-21 09:25:43 +00001828
Eli Friedman77ba7082008-05-30 19:50:47 +00001829 // Replace all uses of the old global with the new global
Mike Stump1eb44332009-09-09 15:08:12 +00001830 llvm::Constant *NewPtrForOldDecl =
Owen Anderson3c4972d2009-07-29 18:54:39 +00001831 llvm::ConstantExpr::getBitCast(GV, Entry->getType());
Chris Lattner570585c2009-03-21 09:16:30 +00001832 Entry->replaceAllUsesWith(NewPtrForOldDecl);
Eli Friedman77ba7082008-05-30 19:50:47 +00001833
1834 // Erase the old global, since it is no longer used.
Chris Lattner570585c2009-03-21 09:16:30 +00001835 cast<llvm::GlobalValue>(Entry)->eraseFromParent();
Chris Lattner8f32f712007-07-14 00:23:28 +00001836 }
Devang Patel8e53e722007-10-26 16:31:40 +00001837
Julien Lerouge77f68bb2011-09-09 22:41:49 +00001838 if (D->hasAttr<AnnotateAttr>())
1839 AddGlobalAnnotations(D, GV);
Nate Begeman8bd4afe2008-04-19 04:17:09 +00001840
Chris Lattner88a69ad2007-07-13 05:13:43 +00001841 GV->setInitializer(Init);
Chris Lattnere78b86f2009-08-05 05:20:29 +00001842
1843 // If it is safe to mark the global 'constant', do so now.
Richard Smitha9b21d22012-02-17 06:48:11 +00001844 GV->setConstant(!NeedsGlobalCtor && !NeedsGlobalDtor &&
1845 isTypeConstant(D->getType(), true));
Mike Stump1eb44332009-09-09 15:08:12 +00001846
Ken Dyck8b752f12010-01-27 17:10:57 +00001847 GV->setAlignment(getContext().getDeclAlign(D).getQuantity());
Richard Smitha9b21d22012-02-17 06:48:11 +00001848
Chris Lattner88a69ad2007-07-13 05:13:43 +00001849 // Set the llvm linkage type as appropriate.
Fariborz Jahanian354e7122010-10-27 16:21:54 +00001850 llvm::GlobalValue::LinkageTypes Linkage =
1851 GetLLVMLinkageVarDefinition(D, GV);
1852 GV->setLinkage(Linkage);
1853 if (Linkage == llvm::GlobalVariable::CommonLinkage)
Chris Lattnere78b86f2009-08-05 05:20:29 +00001854 // common vars aren't constant even if declared const.
1855 GV->setConstant(false);
Daniel Dunbar7e714cd2009-04-10 20:26:50 +00001856
Daniel Dunbar7c65e992009-04-14 08:05:55 +00001857 SetCommonAttributes(D, GV);
Daniel Dunbar04d40782009-04-14 06:00:08 +00001858
John McCall3030eb82010-11-06 09:44:32 +00001859 // Emit the initializer function if necessary.
Richard Smith7ca48502012-02-13 22:16:19 +00001860 if (NeedsGlobalCtor || NeedsGlobalDtor)
1861 EmitCXXGlobalVarDeclInitFunc(D, GV, NeedsGlobalCtor);
John McCall3030eb82010-11-06 09:44:32 +00001862
Kostya Serebryany05c5ebc2012-08-21 06:53:28 +00001863 // If we are compiling with ASan, add metadata indicating dynamically
1864 // initialized globals.
Will Dietz4f45bc02013-01-18 11:30:38 +00001865 if (SanOpts.Address && NeedsGlobalCtor) {
Kostya Serebryany05c5ebc2012-08-21 06:53:28 +00001866 llvm::Module &M = getModule();
1867
1868 llvm::NamedMDNode *DynamicInitializers =
1869 M.getOrInsertNamedMetadata("llvm.asan.dynamically_initialized_globals");
1870 llvm::Value *GlobalToAdd[] = { GV };
1871 llvm::MDNode *ThisGlobal = llvm::MDNode::get(VMContext, GlobalToAdd);
1872 DynamicInitializers->addOperand(ThisGlobal);
1873 }
1874
Sanjiv Gupta686226b2008-06-05 08:59:10 +00001875 // Emit global variable debug information.
Eric Christopher73fb3502011-10-13 21:45:18 +00001876 if (CGDebugInfo *DI = getModuleDebugInfo())
Douglas Gregor4cdad312012-10-23 20:05:01 +00001877 if (getCodeGenOpts().getDebugInfo() >= CodeGenOptions::LimitedDebugInfo)
Alexey Samsonovfd00eec2012-05-04 07:39:27 +00001878 DI->EmitGlobalVariable(GV, D);
Chris Lattner88a69ad2007-07-13 05:13:43 +00001879}
Reid Spencer5f016e22007-07-11 17:01:13 +00001880
Fariborz Jahanian354e7122010-10-27 16:21:54 +00001881llvm::GlobalValue::LinkageTypes
1882CodeGenModule::GetLLVMLinkageVarDefinition(const VarDecl *D,
1883 llvm::GlobalVariable *GV) {
1884 GVALinkage Linkage = getContext().GetGVALinkageForVariable(D);
1885 if (Linkage == GVA_Internal)
1886 return llvm::Function::InternalLinkage;
1887 else if (D->hasAttr<DLLImportAttr>())
1888 return llvm::Function::DLLImportLinkage;
1889 else if (D->hasAttr<DLLExportAttr>())
1890 return llvm::Function::DLLExportLinkage;
1891 else if (D->hasAttr<WeakAttr>()) {
1892 if (GV->isConstant())
1893 return llvm::GlobalVariable::WeakODRLinkage;
1894 else
1895 return llvm::GlobalVariable::WeakAnyLinkage;
1896 } else if (Linkage == GVA_TemplateInstantiation ||
1897 Linkage == GVA_ExplicitTemplateInstantiation)
John McCall99ace162011-04-12 01:46:54 +00001898 return llvm::GlobalVariable::WeakODRLinkage;
David Blaikie4e4d0842012-03-11 07:00:24 +00001899 else if (!getLangOpts().CPlusPlus &&
Eric Christophera6cf1e72010-12-02 02:45:55 +00001900 ((!CodeGenOpts.NoCommon && !D->getAttr<NoCommonAttr>()) ||
1901 D->getAttr<CommonAttr>()) &&
Fariborz Jahanian354e7122010-10-27 16:21:54 +00001902 !D->hasExternalStorage() && !D->getInit() &&
Fariborz Jahanianab27d6e2011-06-20 17:50:03 +00001903 !D->getAttr<SectionAttr>() && !D->isThreadSpecified() &&
1904 !D->getAttr<WeakImportAttr>()) {
Fariborz Jahanian354e7122010-10-27 16:21:54 +00001905 // Thread local vars aren't considered common linkage.
1906 return llvm::GlobalVariable::CommonLinkage;
1907 }
1908 return llvm::GlobalVariable::ExternalLinkage;
1909}
1910
John McCalla923c972012-12-12 22:21:47 +00001911/// Replace the uses of a function that was declared with a non-proto type.
1912/// We want to silently drop extra arguments from call sites
1913static void replaceUsesOfNonProtoConstant(llvm::Constant *old,
1914 llvm::Function *newFn) {
1915 // Fast path.
1916 if (old->use_empty()) return;
1917
1918 llvm::Type *newRetTy = newFn->getReturnType();
1919 SmallVector<llvm::Value*, 4> newArgs;
1920
1921 for (llvm::Value::use_iterator ui = old->use_begin(), ue = old->use_end();
1922 ui != ue; ) {
1923 llvm::Value::use_iterator use = ui++; // Increment before the use is erased.
1924 llvm::User *user = *use;
1925
1926 // Recognize and replace uses of bitcasts. Most calls to
1927 // unprototyped functions will use bitcasts.
1928 if (llvm::ConstantExpr *bitcast = dyn_cast<llvm::ConstantExpr>(user)) {
1929 if (bitcast->getOpcode() == llvm::Instruction::BitCast)
1930 replaceUsesOfNonProtoConstant(bitcast, newFn);
1931 continue;
1932 }
1933
1934 // Recognize calls to the function.
1935 llvm::CallSite callSite(user);
1936 if (!callSite) continue;
1937 if (!callSite.isCallee(use)) continue;
1938
1939 // If the return types don't match exactly, then we can't
1940 // transform this call unless it's dead.
1941 if (callSite->getType() != newRetTy && !callSite->use_empty())
1942 continue;
1943
1944 // Get the call site's attribute list.
Dmitri Gribenkocfa88f82013-01-12 19:30:44 +00001945 SmallVector<llvm::AttributeWithIndex, 8> newAttrs;
John McCalla923c972012-12-12 22:21:47 +00001946 llvm::AttributeSet oldAttrs = callSite.getAttributes();
1947
1948 // Collect any return attributes from the call.
Bill Wendlinga37ce612013-01-21 21:57:40 +00001949 if (oldAttrs.hasAttributes(llvm::AttributeSet::ReturnIndex))
Bill Wendlinged01f842013-01-21 22:45:00 +00001950 newAttrs.push_back(
1951 llvm::AttributeWithIndex::get(newFn->getContext(),
1952 llvm::AttributeSet::ReturnIndex,
1953 oldAttrs.getRetAttributes()));
John McCalla923c972012-12-12 22:21:47 +00001954
1955 // If the function was passed too few arguments, don't transform.
1956 unsigned newNumArgs = newFn->arg_size();
1957 if (callSite.arg_size() < newNumArgs) continue;
1958
1959 // If extra arguments were passed, we silently drop them.
1960 // If any of the types mismatch, we don't transform.
1961 unsigned argNo = 0;
1962 bool dontTransform = false;
1963 for (llvm::Function::arg_iterator ai = newFn->arg_begin(),
1964 ae = newFn->arg_end(); ai != ae; ++ai, ++argNo) {
1965 if (callSite.getArgument(argNo)->getType() != ai->getType()) {
1966 dontTransform = true;
1967 break;
1968 }
1969
1970 // Add any parameter attributes.
Bill Wendling89530e42013-01-23 06:15:10 +00001971 if (oldAttrs.hasAttributes(argNo + 1))
1972 newAttrs.
1973 push_back(llvm::AttributeWithIndex::
1974 get(newFn->getContext(),
1975 argNo + 1,
1976 oldAttrs.getParamAttributes(argNo + 1)));
John McCalla923c972012-12-12 22:21:47 +00001977 }
1978 if (dontTransform)
1979 continue;
1980
Bill Wendlinge67e4c92013-01-18 21:26:07 +00001981 if (oldAttrs.hasAttributes(llvm::AttributeSet::FunctionIndex))
John McCalla923c972012-12-12 22:21:47 +00001982 newAttrs.push_back(llvm::
Bill Wendlinga37ce612013-01-21 21:57:40 +00001983 AttributeWithIndex::get(newFn->getContext(),
1984 llvm::AttributeSet::FunctionIndex,
1985 oldAttrs.getFnAttributes()));
John McCalla923c972012-12-12 22:21:47 +00001986
1987 // Okay, we can transform this. Create the new call instruction and copy
1988 // over the required information.
1989 newArgs.append(callSite.arg_begin(), callSite.arg_begin() + argNo);
1990
1991 llvm::CallSite newCall;
1992 if (callSite.isCall()) {
1993 newCall = llvm::CallInst::Create(newFn, newArgs, "",
1994 callSite.getInstruction());
1995 } else {
1996 llvm::InvokeInst *oldInvoke =
1997 cast<llvm::InvokeInst>(callSite.getInstruction());
1998 newCall = llvm::InvokeInst::Create(newFn,
1999 oldInvoke->getNormalDest(),
2000 oldInvoke->getUnwindDest(),
2001 newArgs, "",
2002 callSite.getInstruction());
2003 }
2004 newArgs.clear(); // for the next iteration
2005
2006 if (!newCall->getType()->isVoidTy())
2007 newCall->takeName(callSite.getInstruction());
2008 newCall.setAttributes(
2009 llvm::AttributeSet::get(newFn->getContext(), newAttrs));
2010 newCall.setCallingConv(callSite.getCallingConv());
2011
2012 // Finally, remove the old call, replacing any uses with the new one.
2013 if (!callSite->use_empty())
2014 callSite->replaceAllUsesWith(newCall.getInstruction());
2015
2016 // Copy debug location attached to CI.
2017 if (!callSite->getDebugLoc().isUnknown())
2018 newCall->setDebugLoc(callSite->getDebugLoc());
2019 callSite->eraseFromParent();
2020 }
2021}
2022
Chris Lattnerbdb01322009-05-05 06:16:31 +00002023/// ReplaceUsesOfNonProtoTypeWithRealFunction - This function is called when we
2024/// implement a function with no prototype, e.g. "int foo() {}". If there are
2025/// existing call uses of the old function in the module, this adjusts them to
2026/// call the new function directly.
2027///
2028/// This is not just a cleanup: the always_inline pass requires direct calls to
2029/// functions to be able to inline them. If there is a bitcast in the way, it
2030/// won't inline them. Instcombine normally deletes these calls, but it isn't
2031/// run at -O0.
2032static void ReplaceUsesOfNonProtoTypeWithRealFunction(llvm::GlobalValue *Old,
2033 llvm::Function *NewFn) {
2034 // If we're redefining a global as a function, don't transform it.
John McCalla923c972012-12-12 22:21:47 +00002035 if (!isa<llvm::Function>(Old)) return;
Mike Stump1eb44332009-09-09 15:08:12 +00002036
John McCalla923c972012-12-12 22:21:47 +00002037 replaceUsesOfNonProtoConstant(Old, NewFn);
Chris Lattnerbdb01322009-05-05 06:16:31 +00002038}
2039
Rafael Espindola02503932012-03-08 15:51:03 +00002040void CodeGenModule::HandleCXXStaticMemberVarInstantiation(VarDecl *VD) {
2041 TemplateSpecializationKind TSK = VD->getTemplateSpecializationKind();
2042 // If we have a definition, this might be a deferred decl. If the
2043 // instantiation is explicit, make sure we emit it at the end.
2044 if (VD->getDefinition() && TSK == TSK_ExplicitInstantiationDefinition)
2045 GetAddrOfGlobalVar(VD);
Rafael Espindola234fe652012-03-05 10:54:55 +00002046}
Daniel Dunbarbd012ff2008-07-29 23:18:29 +00002047
Chris Lattnerb4880ba2009-05-12 21:21:08 +00002048void CodeGenModule::EmitGlobalFunctionDefinition(GlobalDecl GD) {
Chris Lattnerb4880ba2009-05-12 21:21:08 +00002049 const FunctionDecl *D = cast<FunctionDecl>(GD.getDecl());
John McCalld26bc762011-03-09 04:27:21 +00002050
John McCall1f6f9612011-03-09 08:12:35 +00002051 // Compute the function info and LLVM type.
John McCallde5d3c72012-02-17 03:33:10 +00002052 const CGFunctionInfo &FI = getTypes().arrangeGlobalDeclaration(GD);
2053 llvm::FunctionType *Ty = getTypes().GetFunctionType(FI);
John McCalld26bc762011-03-09 04:27:21 +00002054
Chris Lattner9fa959d2009-05-12 20:58:15 +00002055 // Get or create the prototype for the function.
Chris Lattnerb4880ba2009-05-12 21:21:08 +00002056 llvm::Constant *Entry = GetAddrOfFunction(GD, Ty);
Mike Stump1eb44332009-09-09 15:08:12 +00002057
Chris Lattner0558e792009-03-21 09:25:43 +00002058 // Strip off a bitcast if we got one back.
2059 if (llvm::ConstantExpr *CE = dyn_cast<llvm::ConstantExpr>(Entry)) {
2060 assert(CE->getOpcode() == llvm::Instruction::BitCast);
2061 Entry = CE->getOperand(0);
2062 }
Mike Stump1eb44332009-09-09 15:08:12 +00002063
2064
Chris Lattner0558e792009-03-21 09:25:43 +00002065 if (cast<llvm::GlobalValue>(Entry)->getType()->getElementType() != Ty) {
Chris Lattnerbdb01322009-05-05 06:16:31 +00002066 llvm::GlobalValue *OldFn = cast<llvm::GlobalValue>(Entry);
Mike Stump1eb44332009-09-09 15:08:12 +00002067
Daniel Dunbar42745812009-03-09 23:53:08 +00002068 // If the types mismatch then we have to rewrite the definition.
Chris Lattnerbdb01322009-05-05 06:16:31 +00002069 assert(OldFn->isDeclaration() &&
Chris Lattner0558e792009-03-21 09:25:43 +00002070 "Shouldn't replace non-declaration");
Chris Lattner34809502009-03-21 08:53:37 +00002071
Chris Lattner62b33ea2009-03-21 08:38:50 +00002072 // F is the Function* for the one with the wrong type, we must make a new
2073 // Function* and update everything that used F (a declaration) with the new
2074 // Function* (which will be a definition).
2075 //
2076 // This happens if there is a prototype for a function
2077 // (e.g. "int f()") and then a definition of a different type
John McCallf746aa62010-03-19 23:29:14 +00002078 // (e.g. "int f(int x)"). Move the old function aside so that it
2079 // doesn't interfere with GetAddrOfFunction.
Chris Lattner5f9e2722011-07-23 10:55:15 +00002080 OldFn->setName(StringRef());
Chris Lattnerb4880ba2009-05-12 21:21:08 +00002081 llvm::Function *NewFn = cast<llvm::Function>(GetAddrOfFunction(GD, Ty));
Mike Stump1eb44332009-09-09 15:08:12 +00002082
John McCalla923c972012-12-12 22:21:47 +00002083 // This might be an implementation of a function without a
2084 // prototype, in which case, try to do special replacement of
2085 // calls which match the new prototype. The really key thing here
2086 // is that we also potentially drop arguments from the call site
2087 // so as to make a direct call, which makes the inliner happier
2088 // and suppresses a number of optimizer warnings (!) about
2089 // dropping arguments.
2090 if (!OldFn->use_empty()) {
Chris Lattnerbdb01322009-05-05 06:16:31 +00002091 ReplaceUsesOfNonProtoTypeWithRealFunction(OldFn, NewFn);
Chris Lattner9fa959d2009-05-12 20:58:15 +00002092 OldFn->removeDeadConstantUsers();
2093 }
Mike Stump1eb44332009-09-09 15:08:12 +00002094
Chris Lattner62b33ea2009-03-21 08:38:50 +00002095 // Replace uses of F with the Function we will endow with a body.
Chris Lattnerbdb01322009-05-05 06:16:31 +00002096 if (!Entry->use_empty()) {
Mike Stump1eb44332009-09-09 15:08:12 +00002097 llvm::Constant *NewPtrForOldDecl =
Owen Anderson3c4972d2009-07-29 18:54:39 +00002098 llvm::ConstantExpr::getBitCast(NewFn, Entry->getType());
Chris Lattnerbdb01322009-05-05 06:16:31 +00002099 Entry->replaceAllUsesWith(NewPtrForOldDecl);
2100 }
Mike Stump1eb44332009-09-09 15:08:12 +00002101
Chris Lattner62b33ea2009-03-21 08:38:50 +00002102 // Ok, delete the old function now, which is dead.
Chris Lattnerbdb01322009-05-05 06:16:31 +00002103 OldFn->eraseFromParent();
Mike Stump1eb44332009-09-09 15:08:12 +00002104
Chris Lattner0558e792009-03-21 09:25:43 +00002105 Entry = NewFn;
Daniel Dunbarbd012ff2008-07-29 23:18:29 +00002106 }
Mike Stump1eb44332009-09-09 15:08:12 +00002107
John McCall112c9672010-11-02 21:04:24 +00002108 // We need to set linkage and visibility on the function before
2109 // generating code for it because various parts of IR generation
2110 // want to propagate this information down (e.g. to local static
2111 // declarations).
Chris Lattner0558e792009-03-21 09:25:43 +00002112 llvm::Function *Fn = cast<llvm::Function>(Entry);
John McCall8b242332010-05-25 04:30:21 +00002113 setFunctionLinkage(D, Fn);
Daniel Dunbarbd012ff2008-07-29 23:18:29 +00002114
John McCall112c9672010-11-02 21:04:24 +00002115 // FIXME: this is redundant with part of SetFunctionDefinitionAttributes
Anders Carlsson0ffeaad2011-01-29 19:39:23 +00002116 setGlobalVisibility(Fn, D);
John McCall112c9672010-11-02 21:04:24 +00002117
John McCalld26bc762011-03-09 04:27:21 +00002118 CodeGenFunction(*this).GenerateCode(D, Fn, FI);
Daniel Dunbar6bfed7e2008-08-01 00:01:51 +00002119
Daniel Dunbar7c65e992009-04-14 08:05:55 +00002120 SetFunctionDefinitionAttributes(D, Fn);
2121 SetLLVMFunctionAttributesForDefinition(D, Fn);
Mike Stump1eb44332009-09-09 15:08:12 +00002122
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +00002123 if (const ConstructorAttr *CA = D->getAttr<ConstructorAttr>())
Daniel Dunbar219df662008-09-08 23:44:31 +00002124 AddGlobalCtor(Fn, CA->getPriority());
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +00002125 if (const DestructorAttr *DA = D->getAttr<DestructorAttr>())
Daniel Dunbar219df662008-09-08 23:44:31 +00002126 AddGlobalDtor(Fn, DA->getPriority());
Julien Lerouge77f68bb2011-09-09 22:41:49 +00002127 if (D->hasAttr<AnnotateAttr>())
2128 AddGlobalAnnotations(D, Fn);
Daniel Dunbarbd012ff2008-07-29 23:18:29 +00002129}
2130
John McCallf746aa62010-03-19 23:29:14 +00002131void CodeGenModule::EmitAliasDefinition(GlobalDecl GD) {
2132 const ValueDecl *D = cast<ValueDecl>(GD.getDecl());
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +00002133 const AliasAttr *AA = D->getAttr<AliasAttr>();
Chris Lattnerbd532712009-03-22 21:47:11 +00002134 assert(AA && "Not an alias?");
2135
Chris Lattner5f9e2722011-07-23 10:55:15 +00002136 StringRef MangledName = getMangledName(GD);
Mike Stump1eb44332009-09-09 15:08:12 +00002137
John McCallf746aa62010-03-19 23:29:14 +00002138 // If there is a definition in the module, then it wins over the alias.
2139 // This is dubious, but allow it to be safe. Just ignore the alias.
2140 llvm::GlobalValue *Entry = GetGlobalValue(MangledName);
2141 if (Entry && !Entry->isDeclaration())
2142 return;
2143
Chris Lattner2acc6e32011-07-18 04:24:23 +00002144 llvm::Type *DeclTy = getTypes().ConvertTypeForMem(D->getType());
Chris Lattnerbd532712009-03-22 21:47:11 +00002145
2146 // Create a reference to the named value. This ensures that it is emitted
2147 // if a deferred decl.
2148 llvm::Constant *Aliasee;
2149 if (isa<llvm::FunctionType>(DeclTy))
Alex Rosenbergc857ce82012-10-05 23:12:53 +00002150 Aliasee = GetOrCreateLLVMFunction(AA->getAliasee(), DeclTy, GD,
Anders Carlsson1faa89f2011-02-05 04:35:53 +00002151 /*ForVTable=*/false);
Chris Lattnerbd532712009-03-22 21:47:11 +00002152 else
John McCallf746aa62010-03-19 23:29:14 +00002153 Aliasee = GetOrCreateLLVMGlobal(AA->getAliasee(),
Owen Anderson96e0fc72009-07-29 22:16:19 +00002154 llvm::PointerType::getUnqual(DeclTy), 0);
Chris Lattnerbd532712009-03-22 21:47:11 +00002155
2156 // Create the new alias itself, but don't set a name yet.
Mike Stump1eb44332009-09-09 15:08:12 +00002157 llvm::GlobalValue *GA =
Chris Lattnerbd532712009-03-22 21:47:11 +00002158 new llvm::GlobalAlias(Aliasee->getType(),
2159 llvm::Function::ExternalLinkage,
2160 "", Aliasee, &getModule());
Mike Stump1eb44332009-09-09 15:08:12 +00002161
Chris Lattnerbd532712009-03-22 21:47:11 +00002162 if (Entry) {
John McCallf746aa62010-03-19 23:29:14 +00002163 assert(Entry->isDeclaration());
2164
Chris Lattnerbd532712009-03-22 21:47:11 +00002165 // If there is a declaration in the module, then we had an extern followed
2166 // by the alias, as in:
2167 // extern int test6();
2168 // ...
2169 // int test6() __attribute__((alias("test7")));
2170 //
2171 // Remove it and replace uses of it with the alias.
John McCallf746aa62010-03-19 23:29:14 +00002172 GA->takeName(Entry);
Mike Stump1eb44332009-09-09 15:08:12 +00002173
Owen Anderson3c4972d2009-07-29 18:54:39 +00002174 Entry->replaceAllUsesWith(llvm::ConstantExpr::getBitCast(GA,
Chris Lattnerbd532712009-03-22 21:47:11 +00002175 Entry->getType()));
Chris Lattnerbd532712009-03-22 21:47:11 +00002176 Entry->eraseFromParent();
John McCallf746aa62010-03-19 23:29:14 +00002177 } else {
Anders Carlsson9a20d552010-06-22 16:16:50 +00002178 GA->setName(MangledName);
Chris Lattnerbd532712009-03-22 21:47:11 +00002179 }
Mike Stump1eb44332009-09-09 15:08:12 +00002180
Daniel Dunbar7c65e992009-04-14 08:05:55 +00002181 // Set attributes which are particular to an alias; this is a
2182 // specialization of the attributes which may be set on a global
2183 // variable/function.
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +00002184 if (D->hasAttr<DLLExportAttr>()) {
Daniel Dunbar7c65e992009-04-14 08:05:55 +00002185 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
2186 // The dllexport attribute is ignored for undefined symbols.
Argyrios Kyrtzidis06a54a32010-07-07 11:31:19 +00002187 if (FD->hasBody())
Daniel Dunbar7c65e992009-04-14 08:05:55 +00002188 GA->setLinkage(llvm::Function::DLLExportLinkage);
2189 } else {
2190 GA->setLinkage(llvm::Function::DLLExportLinkage);
2191 }
Mike Stump1eb44332009-09-09 15:08:12 +00002192 } else if (D->hasAttr<WeakAttr>() ||
Rafael Espindola11e8ce72010-02-23 22:00:30 +00002193 D->hasAttr<WeakRefAttr>() ||
Douglas Gregor0a0d2b12011-03-23 00:50:03 +00002194 D->isWeakImported()) {
Daniel Dunbar7c65e992009-04-14 08:05:55 +00002195 GA->setLinkage(llvm::Function::WeakAnyLinkage);
2196 }
2197
2198 SetCommonAttributes(D, GA);
Chris Lattnerbd532712009-03-22 21:47:11 +00002199}
2200
Benjamin Kramer8dd55a32011-07-14 17:45:50 +00002201llvm::Function *CodeGenModule::getIntrinsic(unsigned IID,
Chris Lattner2d3ba4f2011-07-23 17:14:25 +00002202 ArrayRef<llvm::Type*> Tys) {
Jay Foaddf983a82011-07-12 14:06:48 +00002203 return llvm::Intrinsic::getDeclaration(&getModule(), (llvm::Intrinsic::ID)IID,
Benjamin Kramer8dd55a32011-07-14 17:45:50 +00002204 Tys);
Chris Lattner7acda7c2007-12-18 00:25:38 +00002205}
Chris Lattnerbef20ac2007-08-31 04:31:45 +00002206
Daniel Dunbar1d552912009-07-23 22:52:48 +00002207static llvm::StringMapEntry<llvm::Constant*> &
2208GetConstantCFStringEntry(llvm::StringMap<llvm::Constant*> &Map,
2209 const StringLiteral *Literal,
Daniel Dunbar70ee9752009-07-23 23:41:22 +00002210 bool TargetIsLSB,
Daniel Dunbar1d552912009-07-23 22:52:48 +00002211 bool &IsUTF16,
2212 unsigned &StringLength) {
Chris Lattner5f9e2722011-07-23 10:55:15 +00002213 StringRef String = Literal->getString();
Benjamin Kramer2f4eaef2010-08-17 12:54:38 +00002214 unsigned NumBytes = String.size();
Daniel Dunbar1d552912009-07-23 22:52:48 +00002215
Daniel Dunbarf015b032009-09-22 10:03:52 +00002216 // Check for simple case.
2217 if (!Literal->containsNonAsciiOrNull()) {
2218 StringLength = NumBytes;
Benjamin Kramer2f4eaef2010-08-17 12:54:38 +00002219 return Map.GetOrCreateValue(String);
Daniel Dunbarf015b032009-09-22 10:03:52 +00002220 }
2221
Bill Wendling84392d02012-03-30 00:26:17 +00002222 // Otherwise, convert the UTF8 literals into a string of shorts.
2223 IsUTF16 = true;
2224
2225 SmallVector<UTF16, 128> ToBuf(NumBytes + 1); // +1 for ending nulls.
Roman Divacky31ba6132012-09-06 15:59:27 +00002226 const UTF8 *FromPtr = (const UTF8 *)String.data();
Daniel Dunbar1d552912009-07-23 22:52:48 +00002227 UTF16 *ToPtr = &ToBuf[0];
Mike Stump1eb44332009-09-09 15:08:12 +00002228
Fariborz Jahaniane7ddfb92010-09-07 19:57:04 +00002229 (void)ConvertUTF8toUTF16(&FromPtr, FromPtr + NumBytes,
2230 &ToPtr, ToPtr + NumBytes,
2231 strictConversion);
Mike Stump1eb44332009-09-09 15:08:12 +00002232
Daniel Dunbar70ee9752009-07-23 23:41:22 +00002233 // ConvertUTF8toUTF16 returns the length in ToPtr.
Daniel Dunbar1d552912009-07-23 22:52:48 +00002234 StringLength = ToPtr - &ToBuf[0];
Daniel Dunbar70ee9752009-07-23 23:41:22 +00002235
Bill Wendling84392d02012-03-30 00:26:17 +00002236 // Add an explicit null.
2237 *ToPtr = 0;
2238 return Map.
2239 GetOrCreateValue(StringRef(reinterpret_cast<const char *>(ToBuf.data()),
2240 (StringLength + 1) * 2));
Daniel Dunbar1d552912009-07-23 22:52:48 +00002241}
2242
Fariborz Jahaniancf8e1682011-05-13 18:13:10 +00002243static llvm::StringMapEntry<llvm::Constant*> &
2244GetConstantStringEntry(llvm::StringMap<llvm::Constant*> &Map,
Bill Wendling8322c232012-03-29 22:12:09 +00002245 const StringLiteral *Literal,
2246 unsigned &StringLength) {
2247 StringRef String = Literal->getString();
2248 StringLength = String.size();
2249 return Map.GetOrCreateValue(String);
Fariborz Jahaniancf8e1682011-05-13 18:13:10 +00002250}
2251
Daniel Dunbar1d552912009-07-23 22:52:48 +00002252llvm::Constant *
2253CodeGenModule::GetAddrOfConstantCFString(const StringLiteral *Literal) {
2254 unsigned StringLength = 0;
2255 bool isUTF16 = false;
2256 llvm::StringMapEntry<llvm::Constant*> &Entry =
Mike Stump1eb44332009-09-09 15:08:12 +00002257 GetConstantCFStringEntry(CFConstantStringMap, Literal,
Micah Villmow25a6a842012-10-08 16:25:52 +00002258 getDataLayout().isLittleEndian(),
Daniel Dunbar70ee9752009-07-23 23:41:22 +00002259 isUTF16, StringLength);
Mike Stump1eb44332009-09-09 15:08:12 +00002260
Daniel Dunbar1d552912009-07-23 22:52:48 +00002261 if (llvm::Constant *C = Entry.getValue())
2262 return C;
Mike Stump1eb44332009-09-09 15:08:12 +00002263
Chris Lattner8b418682012-02-07 00:39:47 +00002264 llvm::Constant *Zero = llvm::Constant::getNullValue(Int32Ty);
Daniel Dunbar3e9df992008-08-23 18:37:06 +00002265 llvm::Constant *Zeros[] = { Zero, Zero };
Mike Stump1eb44332009-09-09 15:08:12 +00002266
Chris Lattner9d4a15f2009-07-16 16:48:25 +00002267 // If we don't already have it, get __CFConstantStringClassReference.
Anders Carlssonc9e20912007-08-21 00:21:21 +00002268 if (!CFConstantStringClassRef) {
Chris Lattner2acc6e32011-07-18 04:24:23 +00002269 llvm::Type *Ty = getTypes().ConvertType(getContext().IntTy);
Owen Anderson96e0fc72009-07-29 22:16:19 +00002270 Ty = llvm::ArrayType::get(Ty, 0);
Mike Stump1eb44332009-09-09 15:08:12 +00002271 llvm::Constant *GV = CreateRuntimeVariable(Ty,
Chris Lattner9d4a15f2009-07-16 16:48:25 +00002272 "__CFConstantStringClassReference");
Daniel Dunbar3e9df992008-08-23 18:37:06 +00002273 // Decay array -> ptr
2274 CFConstantStringClassRef =
Jay Foada5c04342011-07-21 14:31:17 +00002275 llvm::ConstantExpr::getGetElementPtr(GV, Zeros);
Anders Carlssonc9e20912007-08-21 00:21:21 +00002276 }
Mike Stump1eb44332009-09-09 15:08:12 +00002277
Anders Carlssone3daa762008-11-15 18:54:24 +00002278 QualType CFTy = getContext().getCFConstantStringType();
Daniel Dunbar3e9df992008-08-23 18:37:06 +00002279
Chris Lattner2acc6e32011-07-18 04:24:23 +00002280 llvm::StructType *STy =
Anders Carlssone3daa762008-11-15 18:54:24 +00002281 cast<llvm::StructType>(getTypes().ConvertType(CFTy));
2282
Benjamin Kramer1d236ab2011-10-15 12:20:02 +00002283 llvm::Constant *Fields[4];
Douglas Gregor44b43212008-12-11 16:49:14 +00002284
Anders Carlssonc9e20912007-08-21 00:21:21 +00002285 // Class pointer.
Anders Carlsson5add6832009-08-16 05:55:31 +00002286 Fields[0] = CFConstantStringClassRef;
Mike Stump1eb44332009-09-09 15:08:12 +00002287
Anders Carlssonc9e20912007-08-21 00:21:21 +00002288 // Flags.
Chris Lattner2acc6e32011-07-18 04:24:23 +00002289 llvm::Type *Ty = getTypes().ConvertType(getContext().UnsignedIntTy);
Mike Stump1eb44332009-09-09 15:08:12 +00002290 Fields[1] = isUTF16 ? llvm::ConstantInt::get(Ty, 0x07d0) :
Anders Carlsson5add6832009-08-16 05:55:31 +00002291 llvm::ConstantInt::get(Ty, 0x07C8);
2292
Anders Carlssonc9e20912007-08-21 00:21:21 +00002293 // String pointer.
Bill Wendling84392d02012-03-30 00:26:17 +00002294 llvm::Constant *C = 0;
2295 if (isUTF16) {
2296 ArrayRef<uint16_t> Arr =
David Greene5ba58a12013-01-15 22:09:41 +00002297 llvm::makeArrayRef<uint16_t>(reinterpret_cast<uint16_t*>(
2298 const_cast<char *>(Entry.getKey().data())),
Bill Wendling84392d02012-03-30 00:26:17 +00002299 Entry.getKey().size() / 2);
2300 C = llvm::ConstantDataArray::get(VMContext, Arr);
2301 } else {
2302 C = llvm::ConstantDataArray::getString(VMContext, Entry.getKey());
2303 }
Daniel Dunbara9668e02009-04-03 00:57:44 +00002304
Chris Lattner95b851e2009-07-16 05:03:48 +00002305 llvm::GlobalValue::LinkageTypes Linkage;
Bill Wendling1bf7a3f2012-01-10 08:46:39 +00002306 if (isUTF16)
Chris Lattner278b9f02009-10-14 05:55:45 +00002307 // FIXME: why do utf strings get "_" labels instead of "L" labels?
Chris Lattner95b851e2009-07-16 05:03:48 +00002308 Linkage = llvm::GlobalValue::InternalLinkage;
Bill Wendling1bf7a3f2012-01-10 08:46:39 +00002309 else
Rafael Espindola584acf22011-03-14 17:55:00 +00002310 // FIXME: With OS X ld 123.2 (xcode 4) and LTO we would get a linker error
2311 // when using private linkage. It is not clear if this is a bug in ld
2312 // or a reasonable new restriction.
Rafael Espindoladc0f1372011-03-14 21:08:19 +00002313 Linkage = llvm::GlobalValue::LinkerPrivateLinkage;
Chris Lattner278b9f02009-10-14 05:55:45 +00002314
Bill Wendling1bf7a3f2012-01-10 08:46:39 +00002315 // Note: -fwritable-strings doesn't make the backing store strings of
2316 // CFStrings writable. (See <rdar://problem/10657500>)
Mike Stump1eb44332009-09-09 15:08:12 +00002317 llvm::GlobalVariable *GV =
Bill Wendling1bf7a3f2012-01-10 08:46:39 +00002318 new llvm::GlobalVariable(getModule(), C->getType(), /*isConstant=*/true,
2319 Linkage, C, ".str");
Rafael Espindolab266a1f2011-01-17 16:31:00 +00002320 GV->setUnnamedAddr(true);
Daniel Dunbara9668e02009-04-03 00:57:44 +00002321 if (isUTF16) {
Ken Dyck4da244c2010-01-26 18:46:23 +00002322 CharUnits Align = getContext().getTypeAlignInChars(getContext().ShortTy);
2323 GV->setAlignment(Align.getQuantity());
Daniel Dunbarf7e903d2011-04-12 23:30:52 +00002324 } else {
2325 CharUnits Align = getContext().getTypeAlignInChars(getContext().CharTy);
2326 GV->setAlignment(Align.getQuantity());
Daniel Dunbara9668e02009-04-03 00:57:44 +00002327 }
Bill Wendling84392d02012-03-30 00:26:17 +00002328
2329 // String.
Jay Foada5c04342011-07-21 14:31:17 +00002330 Fields[2] = llvm::ConstantExpr::getGetElementPtr(GV, Zeros);
Anders Carlsson5add6832009-08-16 05:55:31 +00002331
Bill Wendling84392d02012-03-30 00:26:17 +00002332 if (isUTF16)
2333 // Cast the UTF16 string to the correct type.
2334 Fields[2] = llvm::ConstantExpr::getBitCast(Fields[2], Int8PtrTy);
2335
Anders Carlssonc9e20912007-08-21 00:21:21 +00002336 // String length.
2337 Ty = getTypes().ConvertType(getContext().LongTy);
Anders Carlsson5add6832009-08-16 05:55:31 +00002338 Fields[3] = llvm::ConstantInt::get(Ty, StringLength);
Mike Stump1eb44332009-09-09 15:08:12 +00002339
Anders Carlssonc9e20912007-08-21 00:21:21 +00002340 // The struct.
Owen Anderson08e25242009-07-27 22:29:56 +00002341 C = llvm::ConstantStruct::get(STy, Fields);
Mike Stump1eb44332009-09-09 15:08:12 +00002342 GV = new llvm::GlobalVariable(getModule(), C->getType(), true,
2343 llvm::GlobalVariable::PrivateLinkage, C,
Chris Lattner95b851e2009-07-16 05:03:48 +00002344 "_unnamed_cfstring_");
Douglas Gregorbcfd1f52011-09-02 00:18:52 +00002345 if (const char *Sect = getContext().getTargetInfo().getCFStringSection())
Daniel Dunbar8e5c2b82009-03-31 23:42:16 +00002346 GV->setSection(Sect);
Daniel Dunbar1d552912009-07-23 22:52:48 +00002347 Entry.setValue(GV);
Mike Stump1eb44332009-09-09 15:08:12 +00002348
Anders Carlsson0c678292007-11-01 00:41:52 +00002349 return GV;
Anders Carlssonc9e20912007-08-21 00:21:21 +00002350}
Chris Lattner45e8cbd2007-11-28 05:34:05 +00002351
Douglas Gregor45c4ea72011-08-09 15:54:21 +00002352static RecordDecl *
2353CreateRecordDecl(const ASTContext &Ctx, RecordDecl::TagKind TK,
2354 DeclContext *DC, IdentifierInfo *Id) {
2355 SourceLocation Loc;
David Blaikie4e4d0842012-03-11 07:00:24 +00002356 if (Ctx.getLangOpts().CPlusPlus)
Douglas Gregor45c4ea72011-08-09 15:54:21 +00002357 return CXXRecordDecl::Create(Ctx, TK, DC, Loc, Loc, Id);
2358 else
2359 return RecordDecl::Create(Ctx, TK, DC, Loc, Loc, Id);
2360}
2361
Fariborz Jahanian33e982b2010-04-22 20:26:39 +00002362llvm::Constant *
Fariborz Jahanian4c733072010-10-19 17:19:29 +00002363CodeGenModule::GetAddrOfConstantString(const StringLiteral *Literal) {
Fariborz Jahanian2bb5dda2010-04-23 17:41:07 +00002364 unsigned StringLength = 0;
Fariborz Jahanian2bb5dda2010-04-23 17:41:07 +00002365 llvm::StringMapEntry<llvm::Constant*> &Entry =
Fariborz Jahaniancf8e1682011-05-13 18:13:10 +00002366 GetConstantStringEntry(CFConstantStringMap, Literal, StringLength);
Fariborz Jahanian2bb5dda2010-04-23 17:41:07 +00002367
2368 if (llvm::Constant *C = Entry.getValue())
2369 return C;
2370
Chris Lattner812234b2012-02-06 22:47:00 +00002371 llvm::Constant *Zero = llvm::Constant::getNullValue(Int32Ty);
Fariborz Jahanian2bb5dda2010-04-23 17:41:07 +00002372 llvm::Constant *Zeros[] = { Zero, Zero };
2373
Fariborz Jahanianec951e02010-04-23 22:33:39 +00002374 // If we don't already have it, get _NSConstantStringClassReference.
Fariborz Jahanian4c733072010-10-19 17:19:29 +00002375 if (!ConstantStringClassRef) {
David Blaikie4e4d0842012-03-11 07:00:24 +00002376 std::string StringClass(getLangOpts().ObjCConstantStringClass);
Chris Lattner2acc6e32011-07-18 04:24:23 +00002377 llvm::Type *Ty = getTypes().ConvertType(getContext().IntTy);
Fariborz Jahanian4c733072010-10-19 17:19:29 +00002378 llvm::Constant *GV;
John McCall260611a2012-06-20 06:18:46 +00002379 if (LangOpts.ObjCRuntime.isNonFragile()) {
Fariborz Jahanian25dba5d2011-05-17 22:46:11 +00002380 std::string str =
2381 StringClass.empty() ? "OBJC_CLASS_$_NSConstantString"
2382 : "OBJC_CLASS_$_" + StringClass;
Fariborz Jahanian6f40e222011-05-17 22:21:16 +00002383 GV = getObjCRuntime().GetClassGlobal(str);
2384 // Make sure the result is of the correct type.
Chris Lattner2acc6e32011-07-18 04:24:23 +00002385 llvm::Type *PTy = llvm::PointerType::getUnqual(Ty);
Fariborz Jahanian6f40e222011-05-17 22:21:16 +00002386 ConstantStringClassRef =
2387 llvm::ConstantExpr::getBitCast(GV, PTy);
2388 } else {
Fariborz Jahanian25dba5d2011-05-17 22:46:11 +00002389 std::string str =
2390 StringClass.empty() ? "_NSConstantStringClassReference"
2391 : "_" + StringClass + "ClassReference";
Chris Lattner2acc6e32011-07-18 04:24:23 +00002392 llvm::Type *PTy = llvm::ArrayType::get(Ty, 0);
Fariborz Jahanian25dba5d2011-05-17 22:46:11 +00002393 GV = CreateRuntimeVariable(PTy, str);
Fariborz Jahanian6f40e222011-05-17 22:21:16 +00002394 // Decay array -> ptr
2395 ConstantStringClassRef =
Jay Foada5c04342011-07-21 14:31:17 +00002396 llvm::ConstantExpr::getGetElementPtr(GV, Zeros);
Fariborz Jahanian4c733072010-10-19 17:19:29 +00002397 }
Fariborz Jahanian2bb5dda2010-04-23 17:41:07 +00002398 }
Douglas Gregor45c4ea72011-08-09 15:54:21 +00002399
2400 if (!NSConstantStringType) {
2401 // Construct the type for a constant NSString.
2402 RecordDecl *D = CreateRecordDecl(Context, TTK_Struct,
2403 Context.getTranslationUnitDecl(),
2404 &Context.Idents.get("__builtin_NSString"));
2405 D->startDefinition();
2406
2407 QualType FieldTypes[3];
2408
2409 // const int *isa;
2410 FieldTypes[0] = Context.getPointerType(Context.IntTy.withConst());
2411 // const char *str;
2412 FieldTypes[1] = Context.getPointerType(Context.CharTy.withConst());
2413 // unsigned int length;
2414 FieldTypes[2] = Context.UnsignedIntTy;
2415
2416 // Create fields
2417 for (unsigned i = 0; i < 3; ++i) {
2418 FieldDecl *Field = FieldDecl::Create(Context, D,
2419 SourceLocation(),
2420 SourceLocation(), 0,
2421 FieldTypes[i], /*TInfo=*/0,
2422 /*BitWidth=*/0,
2423 /*Mutable=*/false,
Richard Smithca523302012-06-10 03:12:00 +00002424 ICIS_NoInit);
Douglas Gregor45c4ea72011-08-09 15:54:21 +00002425 Field->setAccess(AS_public);
2426 D->addDecl(Field);
2427 }
2428
2429 D->completeDefinition();
2430 QualType NSTy = Context.getTagDeclType(D);
2431 NSConstantStringType = cast<llvm::StructType>(getTypes().ConvertType(NSTy));
2432 }
Fariborz Jahanian2bb5dda2010-04-23 17:41:07 +00002433
Benjamin Kramer1d236ab2011-10-15 12:20:02 +00002434 llvm::Constant *Fields[3];
Fariborz Jahanian2bb5dda2010-04-23 17:41:07 +00002435
2436 // Class pointer.
Fariborz Jahanian4c733072010-10-19 17:19:29 +00002437 Fields[0] = ConstantStringClassRef;
Fariborz Jahanian2bb5dda2010-04-23 17:41:07 +00002438
2439 // String pointer.
Chris Lattner94010692012-02-05 02:30:40 +00002440 llvm::Constant *C =
2441 llvm::ConstantDataArray::getString(VMContext, Entry.getKey());
Fariborz Jahanian2bb5dda2010-04-23 17:41:07 +00002442
2443 llvm::GlobalValue::LinkageTypes Linkage;
2444 bool isConstant;
Fariborz Jahaniancf8e1682011-05-13 18:13:10 +00002445 Linkage = llvm::GlobalValue::PrivateLinkage;
David Blaikie4e4d0842012-03-11 07:00:24 +00002446 isConstant = !LangOpts.WritableStrings;
Fariborz Jahanian2bb5dda2010-04-23 17:41:07 +00002447
2448 llvm::GlobalVariable *GV =
2449 new llvm::GlobalVariable(getModule(), C->getType(), isConstant, Linkage, C,
2450 ".str");
Rafael Espindola803d3072011-01-17 22:11:21 +00002451 GV->setUnnamedAddr(true);
Fariborz Jahaniancf8e1682011-05-13 18:13:10 +00002452 CharUnits Align = getContext().getTypeAlignInChars(getContext().CharTy);
2453 GV->setAlignment(Align.getQuantity());
Jay Foada5c04342011-07-21 14:31:17 +00002454 Fields[1] = llvm::ConstantExpr::getGetElementPtr(GV, Zeros);
Fariborz Jahanian2bb5dda2010-04-23 17:41:07 +00002455
2456 // String length.
Chris Lattner2acc6e32011-07-18 04:24:23 +00002457 llvm::Type *Ty = getTypes().ConvertType(getContext().UnsignedIntTy);
Fariborz Jahanian2bb5dda2010-04-23 17:41:07 +00002458 Fields[2] = llvm::ConstantInt::get(Ty, StringLength);
2459
2460 // The struct.
Douglas Gregor45c4ea72011-08-09 15:54:21 +00002461 C = llvm::ConstantStruct::get(NSConstantStringType, Fields);
Fariborz Jahanian2bb5dda2010-04-23 17:41:07 +00002462 GV = new llvm::GlobalVariable(getModule(), C->getType(), true,
2463 llvm::GlobalVariable::PrivateLinkage, C,
2464 "_unnamed_nsstring_");
2465 // FIXME. Fix section.
Fariborz Jahanianec951e02010-04-23 22:33:39 +00002466 if (const char *Sect =
John McCall260611a2012-06-20 06:18:46 +00002467 LangOpts.ObjCRuntime.isNonFragile()
Douglas Gregorbcfd1f52011-09-02 00:18:52 +00002468 ? getContext().getTargetInfo().getNSStringNonFragileABISection()
2469 : getContext().getTargetInfo().getNSStringSection())
Fariborz Jahanian2bb5dda2010-04-23 17:41:07 +00002470 GV->setSection(Sect);
2471 Entry.setValue(GV);
2472
2473 return GV;
Fariborz Jahanian33e982b2010-04-22 20:26:39 +00002474}
2475
Douglas Gregor0815b572011-08-09 17:23:49 +00002476QualType CodeGenModule::getObjCFastEnumerationStateType() {
2477 if (ObjCFastEnumerationStateType.isNull()) {
2478 RecordDecl *D = CreateRecordDecl(Context, TTK_Struct,
2479 Context.getTranslationUnitDecl(),
2480 &Context.Idents.get("__objcFastEnumerationState"));
2481 D->startDefinition();
2482
2483 QualType FieldTypes[] = {
2484 Context.UnsignedLongTy,
2485 Context.getPointerType(Context.getObjCIdType()),
2486 Context.getPointerType(Context.UnsignedLongTy),
2487 Context.getConstantArrayType(Context.UnsignedLongTy,
2488 llvm::APInt(32, 5), ArrayType::Normal, 0)
2489 };
2490
2491 for (size_t i = 0; i < 4; ++i) {
2492 FieldDecl *Field = FieldDecl::Create(Context,
2493 D,
2494 SourceLocation(),
2495 SourceLocation(), 0,
2496 FieldTypes[i], /*TInfo=*/0,
2497 /*BitWidth=*/0,
2498 /*Mutable=*/false,
Richard Smithca523302012-06-10 03:12:00 +00002499 ICIS_NoInit);
Douglas Gregor0815b572011-08-09 17:23:49 +00002500 Field->setAccess(AS_public);
2501 D->addDecl(Field);
2502 }
2503
2504 D->completeDefinition();
2505 ObjCFastEnumerationStateType = Context.getTagDeclType(D);
2506 }
2507
2508 return ObjCFastEnumerationStateType;
2509}
2510
Eli Friedman64f45a22011-11-01 02:23:42 +00002511llvm::Constant *
2512CodeGenModule::GetConstantArrayFromStringLiteral(const StringLiteral *E) {
2513 assert(!E->getType()->isPointerType() && "Strings are always arrays");
2514
2515 // Don't emit it as the address of the string, emit the string data itself
2516 // as an inline array.
Chris Lattner812234b2012-02-06 22:47:00 +00002517 if (E->getCharByteWidth() == 1) {
2518 SmallString<64> Str(E->getString());
2519
2520 // Resize the string to the right size, which is indicated by its type.
2521 const ConstantArrayType *CAT = Context.getAsConstantArrayType(E->getType());
2522 Str.resize(CAT->getSize().getZExtValue());
2523 return llvm::ConstantDataArray::getString(VMContext, Str, false);
2524 }
Chris Lattner94010692012-02-05 02:30:40 +00002525
2526 llvm::ArrayType *AType =
2527 cast<llvm::ArrayType>(getTypes().ConvertType(E->getType()));
2528 llvm::Type *ElemTy = AType->getElementType();
2529 unsigned NumElements = AType->getNumElements();
Chris Lattnerd79ed432012-02-06 22:52:04 +00002530
2531 // Wide strings have either 2-byte or 4-byte elements.
2532 if (ElemTy->getPrimitiveSizeInBits() == 16) {
2533 SmallVector<uint16_t, 32> Elements;
2534 Elements.reserve(NumElements);
2535
2536 for(unsigned i = 0, e = E->getLength(); i != e; ++i)
2537 Elements.push_back(E->getCodeUnit(i));
2538 Elements.resize(NumElements);
2539 return llvm::ConstantDataArray::get(VMContext, Elements);
Chris Lattner94010692012-02-05 02:30:40 +00002540 }
2541
Chris Lattnerd79ed432012-02-06 22:52:04 +00002542 assert(ElemTy->getPrimitiveSizeInBits() == 32);
2543 SmallVector<uint32_t, 32> Elements;
2544 Elements.reserve(NumElements);
2545
2546 for(unsigned i = 0, e = E->getLength(); i != e; ++i)
2547 Elements.push_back(E->getCodeUnit(i));
2548 Elements.resize(NumElements);
2549 return llvm::ConstantDataArray::get(VMContext, Elements);
Eli Friedman64f45a22011-11-01 02:23:42 +00002550}
2551
Daniel Dunbar61432932008-08-13 23:20:05 +00002552/// GetAddrOfConstantStringFromLiteral - Return a pointer to a
2553/// constant array for the given string literal.
2554llvm::Constant *
2555CodeGenModule::GetAddrOfConstantStringFromLiteral(const StringLiteral *S) {
John McCalla5e19c62011-08-04 01:03:22 +00002556 CharUnits Align = getContext().getTypeAlignInChars(S->getType());
Eli Friedman64f45a22011-11-01 02:23:42 +00002557 if (S->isAscii() || S->isUTF8()) {
Chris Lattner812234b2012-02-06 22:47:00 +00002558 SmallString<64> Str(S->getString());
2559
2560 // Resize the string to the right size, which is indicated by its type.
2561 const ConstantArrayType *CAT = Context.getAsConstantArrayType(S->getType());
2562 Str.resize(CAT->getSize().getZExtValue());
2563 return GetAddrOfConstantString(Str, /*GlobalName*/ 0, Align.getQuantity());
Eli Friedman7eb79c12009-11-16 05:55:46 +00002564 }
Eli Friedman64f45a22011-11-01 02:23:42 +00002565
Chris Lattner812234b2012-02-06 22:47:00 +00002566 // FIXME: the following does not memoize wide strings.
Eli Friedman64f45a22011-11-01 02:23:42 +00002567 llvm::Constant *C = GetConstantArrayFromStringLiteral(S);
2568 llvm::GlobalVariable *GV =
2569 new llvm::GlobalVariable(getModule(),C->getType(),
David Blaikie4e4d0842012-03-11 07:00:24 +00002570 !LangOpts.WritableStrings,
Eli Friedman64f45a22011-11-01 02:23:42 +00002571 llvm::GlobalValue::PrivateLinkage,
2572 C,".str");
Seth Cantrell7d6a7c02012-01-18 12:11:32 +00002573
Eli Friedman64f45a22011-11-01 02:23:42 +00002574 GV->setAlignment(Align.getQuantity());
2575 GV->setUnnamedAddr(true);
Eli Friedman64f45a22011-11-01 02:23:42 +00002576 return GV;
Daniel Dunbar61432932008-08-13 23:20:05 +00002577}
2578
Chris Lattnereaf2bb82009-02-24 22:18:39 +00002579/// GetAddrOfConstantStringFromObjCEncode - Return a pointer to a constant
2580/// array for the given ObjCEncodeExpr node.
2581llvm::Constant *
2582CodeGenModule::GetAddrOfConstantStringFromObjCEncode(const ObjCEncodeExpr *E) {
2583 std::string Str;
2584 getContext().getObjCEncodingForType(E->getEncodedType(), Str);
Eli Friedmana210f352009-03-07 20:17:55 +00002585
2586 return GetAddrOfConstantCString(Str);
Chris Lattnereaf2bb82009-02-24 22:18:39 +00002587}
2588
2589
Chris Lattnera7ad98f2008-02-11 00:02:17 +00002590/// GenerateWritableString -- Creates storage for a string literal.
John McCalla5e19c62011-08-04 01:03:22 +00002591static llvm::GlobalVariable *GenerateStringLiteral(StringRef str,
Chris Lattner45e8cbd2007-11-28 05:34:05 +00002592 bool constant,
Daniel Dunbar5fabf9d2008-10-17 21:56:50 +00002593 CodeGenModule &CGM,
John McCalla5e19c62011-08-04 01:03:22 +00002594 const char *GlobalName,
2595 unsigned Alignment) {
Daniel Dunbar61432932008-08-13 23:20:05 +00002596 // Create Constant for this string literal. Don't add a '\0'.
Owen Anderson0032b272009-08-13 21:57:51 +00002597 llvm::Constant *C =
Chris Lattner94010692012-02-05 02:30:40 +00002598 llvm::ConstantDataArray::getString(CGM.getLLVMContext(), str, false);
Mike Stump1eb44332009-09-09 15:08:12 +00002599
Chris Lattner45e8cbd2007-11-28 05:34:05 +00002600 // Create a global variable for this string
Rafael Espindola1257bc62011-01-10 22:34:03 +00002601 llvm::GlobalVariable *GV =
2602 new llvm::GlobalVariable(CGM.getModule(), C->getType(), constant,
2603 llvm::GlobalValue::PrivateLinkage,
2604 C, GlobalName);
John McCalla5e19c62011-08-04 01:03:22 +00002605 GV->setAlignment(Alignment);
Rafael Espindola1257bc62011-01-10 22:34:03 +00002606 GV->setUnnamedAddr(true);
2607 return GV;
Chris Lattner45e8cbd2007-11-28 05:34:05 +00002608}
2609
Daniel Dunbar61432932008-08-13 23:20:05 +00002610/// GetAddrOfConstantString - Returns a pointer to a character array
2611/// containing the literal. This contents are exactly that of the
2612/// given string, i.e. it will not be null terminated automatically;
2613/// see GetAddrOfConstantCString. Note that whether the result is
2614/// actually a pointer to an LLVM constant depends on
2615/// Feature.WriteableStrings.
2616///
2617/// The result has pointer to array type.
Chris Lattner5f9e2722011-07-23 10:55:15 +00002618llvm::Constant *CodeGenModule::GetAddrOfConstantString(StringRef Str,
John McCalla5e19c62011-08-04 01:03:22 +00002619 const char *GlobalName,
2620 unsigned Alignment) {
Daniel Dunbar8e5c2b82009-03-31 23:42:16 +00002621 // Get the default prefix if a name wasn't specified.
2622 if (!GlobalName)
Chris Lattner95b851e2009-07-16 05:03:48 +00002623 GlobalName = ".str";
Daniel Dunbar8e5c2b82009-03-31 23:42:16 +00002624
2625 // Don't share any string literals if strings aren't constant.
David Blaikie4e4d0842012-03-11 07:00:24 +00002626 if (LangOpts.WritableStrings)
John McCalla5e19c62011-08-04 01:03:22 +00002627 return GenerateStringLiteral(Str, false, *this, GlobalName, Alignment);
Mike Stump1eb44332009-09-09 15:08:12 +00002628
John McCalla5e19c62011-08-04 01:03:22 +00002629 llvm::StringMapEntry<llvm::GlobalVariable *> &Entry =
Benjamin Kramer9de43422011-03-05 13:45:23 +00002630 ConstantStringMap.GetOrCreateValue(Str);
Chris Lattner45e8cbd2007-11-28 05:34:05 +00002631
John McCalla5e19c62011-08-04 01:03:22 +00002632 if (llvm::GlobalVariable *GV = Entry.getValue()) {
2633 if (Alignment > GV->getAlignment()) {
2634 GV->setAlignment(Alignment);
2635 }
2636 return GV;
2637 }
Chris Lattner45e8cbd2007-11-28 05:34:05 +00002638
2639 // Create a global variable for this.
Chris Lattner812234b2012-02-06 22:47:00 +00002640 llvm::GlobalVariable *GV = GenerateStringLiteral(Str, true, *this, GlobalName,
2641 Alignment);
John McCalla5e19c62011-08-04 01:03:22 +00002642 Entry.setValue(GV);
2643 return GV;
Chris Lattner45e8cbd2007-11-28 05:34:05 +00002644}
Daniel Dunbar61432932008-08-13 23:20:05 +00002645
2646/// GetAddrOfConstantCString - Returns a pointer to a character
Benjamin Kramer9de43422011-03-05 13:45:23 +00002647/// array containing the literal and a terminating '\0'
Daniel Dunbar61432932008-08-13 23:20:05 +00002648/// character. The result has pointer to array type.
Benjamin Kramer9de43422011-03-05 13:45:23 +00002649llvm::Constant *CodeGenModule::GetAddrOfConstantCString(const std::string &Str,
John McCalla5e19c62011-08-04 01:03:22 +00002650 const char *GlobalName,
2651 unsigned Alignment) {
Chris Lattner5f9e2722011-07-23 10:55:15 +00002652 StringRef StrWithNull(Str.c_str(), Str.size() + 1);
John McCalla5e19c62011-08-04 01:03:22 +00002653 return GetAddrOfConstantString(StrWithNull, GlobalName, Alignment);
Daniel Dunbar61432932008-08-13 23:20:05 +00002654}
Daniel Dunbar41071de2008-08-15 23:26:23 +00002655
Daniel Dunbaraf05bb92008-08-26 08:29:31 +00002656/// EmitObjCPropertyImplementations - Emit information for synthesized
2657/// properties for an implementation.
Mike Stump1eb44332009-09-09 15:08:12 +00002658void CodeGenModule::EmitObjCPropertyImplementations(const
Daniel Dunbaraf05bb92008-08-26 08:29:31 +00002659 ObjCImplementationDecl *D) {
Mike Stump1eb44332009-09-09 15:08:12 +00002660 for (ObjCImplementationDecl::propimpl_iterator
Argyrios Kyrtzidis17945a02009-06-30 02:36:12 +00002661 i = D->propimpl_begin(), e = D->propimpl_end(); i != e; ++i) {
David Blaikie581deb32012-06-06 20:45:41 +00002662 ObjCPropertyImplDecl *PID = *i;
Mike Stump1eb44332009-09-09 15:08:12 +00002663
Daniel Dunbaraf05bb92008-08-26 08:29:31 +00002664 // Dynamic is just for type-checking.
2665 if (PID->getPropertyImplementation() == ObjCPropertyImplDecl::Synthesize) {
2666 ObjCPropertyDecl *PD = PID->getPropertyDecl();
2667
2668 // Determine which methods need to be implemented, some may have
Jordan Rose1e4691b2012-10-10 16:42:25 +00002669 // been overridden. Note that ::isPropertyAccessor is not the method
Daniel Dunbaraf05bb92008-08-26 08:29:31 +00002670 // we want, that just indicates if the decl came from a
2671 // property. What we want to know is if the method is defined in
2672 // this implementation.
Argyrios Kyrtzidis17945a02009-06-30 02:36:12 +00002673 if (!D->getInstanceMethod(PD->getGetterName()))
Fariborz Jahanianfef30b52008-12-09 20:23:04 +00002674 CodeGenFunction(*this).GenerateObjCGetter(
2675 const_cast<ObjCImplementationDecl *>(D), PID);
Daniel Dunbaraf05bb92008-08-26 08:29:31 +00002676 if (!PD->isReadOnly() &&
Argyrios Kyrtzidis17945a02009-06-30 02:36:12 +00002677 !D->getInstanceMethod(PD->getSetterName()))
Fariborz Jahanianfef30b52008-12-09 20:23:04 +00002678 CodeGenFunction(*this).GenerateObjCSetter(
2679 const_cast<ObjCImplementationDecl *>(D), PID);
Daniel Dunbaraf05bb92008-08-26 08:29:31 +00002680 }
2681 }
2682}
2683
John McCalle81ac692011-03-22 07:05:39 +00002684static bool needsDestructMethod(ObjCImplementationDecl *impl) {
Jordy Rosedb8264e2011-07-22 02:08:32 +00002685 const ObjCInterfaceDecl *iface = impl->getClassInterface();
2686 for (const ObjCIvarDecl *ivar = iface->all_declared_ivar_begin();
John McCalle81ac692011-03-22 07:05:39 +00002687 ivar; ivar = ivar->getNextIvar())
2688 if (ivar->getType().isDestructedType())
2689 return true;
2690
2691 return false;
2692}
2693
Fariborz Jahanian109dfc62010-04-28 21:28:56 +00002694/// EmitObjCIvarInitializations - Emit information for ivar initialization
2695/// for an implementation.
2696void CodeGenModule::EmitObjCIvarInitializations(ObjCImplementationDecl *D) {
John McCalle81ac692011-03-22 07:05:39 +00002697 // We might need a .cxx_destruct even if we don't have any ivar initializers.
2698 if (needsDestructMethod(D)) {
2699 IdentifierInfo *II = &getContext().Idents.get(".cxx_destruct");
2700 Selector cxxSelector = getContext().Selectors.getSelector(0, &II);
2701 ObjCMethodDecl *DTORMethod =
2702 ObjCMethodDecl::Create(getContext(), D->getLocation(), D->getLocation(),
Argyrios Kyrtzidis75cf3e82011-08-17 19:25:08 +00002703 cxxSelector, getContext().VoidTy, 0, D,
2704 /*isInstance=*/true, /*isVariadic=*/false,
Jordan Rose1e4691b2012-10-10 16:42:25 +00002705 /*isPropertyAccessor=*/true, /*isImplicitlyDeclared=*/true,
Argyrios Kyrtzidis75cf3e82011-08-17 19:25:08 +00002706 /*isDefined=*/false, ObjCMethodDecl::Required);
John McCalle81ac692011-03-22 07:05:39 +00002707 D->addInstanceMethod(DTORMethod);
2708 CodeGenFunction(*this).GenerateObjCCtorDtorMethod(D, DTORMethod, false);
John McCallb03527a2012-10-17 04:53:31 +00002709 D->setHasDestructors(true);
John McCalle81ac692011-03-22 07:05:39 +00002710 }
2711
2712 // If the implementation doesn't have any ivar initializers, we don't need
2713 // a .cxx_construct.
David Chisnall827bbcc2011-03-17 14:19:08 +00002714 if (D->getNumIvarInitializers() == 0)
Fariborz Jahanian109dfc62010-04-28 21:28:56 +00002715 return;
Fariborz Jahanian109dfc62010-04-28 21:28:56 +00002716
John McCalle81ac692011-03-22 07:05:39 +00002717 IdentifierInfo *II = &getContext().Idents.get(".cxx_construct");
2718 Selector cxxSelector = getContext().Selectors.getSelector(0, &II);
Fariborz Jahanian109dfc62010-04-28 21:28:56 +00002719 // The constructor returns 'self'.
2720 ObjCMethodDecl *CTORMethod = ObjCMethodDecl::Create(getContext(),
2721 D->getLocation(),
Argyrios Kyrtzidis11d77162011-10-03 06:36:36 +00002722 D->getLocation(),
Argyrios Kyrtzidis11d77162011-10-03 06:36:36 +00002723 cxxSelector,
Fariborz Jahanian109dfc62010-04-28 21:28:56 +00002724 getContext().getObjCIdType(), 0,
Argyrios Kyrtzidis75cf3e82011-08-17 19:25:08 +00002725 D, /*isInstance=*/true,
2726 /*isVariadic=*/false,
Jordan Rose1e4691b2012-10-10 16:42:25 +00002727 /*isPropertyAccessor=*/true,
Argyrios Kyrtzidis75cf3e82011-08-17 19:25:08 +00002728 /*isImplicitlyDeclared=*/true,
2729 /*isDefined=*/false,
Fariborz Jahanian109dfc62010-04-28 21:28:56 +00002730 ObjCMethodDecl::Required);
2731 D->addInstanceMethod(CTORMethod);
2732 CodeGenFunction(*this).GenerateObjCCtorDtorMethod(D, CTORMethod, true);
John McCallb03527a2012-10-17 04:53:31 +00002733 D->setHasNonZeroConstructors(true);
Fariborz Jahanian109dfc62010-04-28 21:28:56 +00002734}
2735
Anders Carlsson91e20dd2009-04-02 05:55:18 +00002736/// EmitNamespace - Emit all declarations in a namespace.
Anders Carlsson984e0682009-04-01 00:58:25 +00002737void CodeGenModule::EmitNamespace(const NamespaceDecl *ND) {
Argyrios Kyrtzidis17945a02009-06-30 02:36:12 +00002738 for (RecordDecl::decl_iterator I = ND->decls_begin(), E = ND->decls_end();
Anders Carlsson984e0682009-04-01 00:58:25 +00002739 I != E; ++I)
2740 EmitTopLevelDecl(*I);
2741}
2742
Anders Carlsson91e20dd2009-04-02 05:55:18 +00002743// EmitLinkageSpec - Emit all declarations in a linkage spec.
2744void CodeGenModule::EmitLinkageSpec(const LinkageSpecDecl *LSD) {
Eli Friedmanf976be82009-08-01 20:48:04 +00002745 if (LSD->getLanguage() != LinkageSpecDecl::lang_c &&
2746 LSD->getLanguage() != LinkageSpecDecl::lang_cxx) {
Anders Carlsson91e20dd2009-04-02 05:55:18 +00002747 ErrorUnsupported(LSD, "linkage spec");
2748 return;
2749 }
2750
Argyrios Kyrtzidis17945a02009-06-30 02:36:12 +00002751 for (RecordDecl::decl_iterator I = LSD->decls_begin(), E = LSD->decls_end();
Fariborz Jahanianc1868e52012-10-26 20:22:11 +00002752 I != E; ++I) {
Fariborz Jahanian107dae42012-10-26 22:20:25 +00002753 // Meta-data for ObjC class includes references to implemented methods.
2754 // Generate class's method definitions first.
Fariborz Jahanianc1868e52012-10-26 20:22:11 +00002755 if (ObjCImplDecl *OID = dyn_cast<ObjCImplDecl>(*I)) {
2756 for (ObjCContainerDecl::method_iterator M = OID->meth_begin(),
2757 MEnd = OID->meth_end();
2758 M != MEnd; ++M)
2759 EmitTopLevelDecl(*M);
2760 }
Anders Carlsson91e20dd2009-04-02 05:55:18 +00002761 EmitTopLevelDecl(*I);
Fariborz Jahanianc1868e52012-10-26 20:22:11 +00002762 }
Anders Carlsson91e20dd2009-04-02 05:55:18 +00002763}
2764
Daniel Dunbar41071de2008-08-15 23:26:23 +00002765/// EmitTopLevelDecl - Emit code for a single top level declaration.
2766void CodeGenModule::EmitTopLevelDecl(Decl *D) {
2767 // If an error has occurred, stop code generation, but continue
2768 // parsing and semantic analysis (to ensure all warnings and errors
2769 // are emitted).
2770 if (Diags.hasErrorOccurred())
2771 return;
2772
Douglas Gregor16e8be22009-06-29 17:30:29 +00002773 // Ignore dependent declarations.
2774 if (D->getDeclContext() && D->getDeclContext()->isDependentContext())
2775 return;
Mike Stump1eb44332009-09-09 15:08:12 +00002776
Daniel Dunbar41071de2008-08-15 23:26:23 +00002777 switch (D->getKind()) {
Anders Carlsson293361a2009-08-25 13:14:46 +00002778 case Decl::CXXConversion:
Anders Carlsson2b77ba82009-04-04 20:47:02 +00002779 case Decl::CXXMethod:
Daniel Dunbar41071de2008-08-15 23:26:23 +00002780 case Decl::Function:
Douglas Gregor16e8be22009-06-29 17:30:29 +00002781 // Skip function templates
Francois Pichet8387e2a2011-04-22 22:18:13 +00002782 if (cast<FunctionDecl>(D)->getDescribedFunctionTemplate() ||
2783 cast<FunctionDecl>(D)->isLateTemplateParsed())
Douglas Gregor16e8be22009-06-29 17:30:29 +00002784 return;
Mike Stump1eb44332009-09-09 15:08:12 +00002785
Anders Carlsson555b4bb2009-09-10 23:43:36 +00002786 EmitGlobal(cast<FunctionDecl>(D));
2787 break;
2788
Daniel Dunbar41071de2008-08-15 23:26:23 +00002789 case Decl::Var:
Anders Carlsson555b4bb2009-09-10 23:43:36 +00002790 EmitGlobal(cast<VarDecl>(D));
Daniel Dunbar41071de2008-08-15 23:26:23 +00002791 break;
2792
John McCall26fbc722011-04-12 01:01:22 +00002793 // Indirect fields from global anonymous structs and unions can be
2794 // ignored; only the actual variable requires IR gen support.
2795 case Decl::IndirectField:
2796 break;
2797
Anders Carlsson95d4e5d2009-04-15 15:55:24 +00002798 // C++ Decls
Daniel Dunbar41071de2008-08-15 23:26:23 +00002799 case Decl::Namespace:
Anders Carlsson984e0682009-04-01 00:58:25 +00002800 EmitNamespace(cast<NamespaceDecl>(D));
Daniel Dunbar41071de2008-08-15 23:26:23 +00002801 break;
Douglas Gregor9cfbe482009-06-20 00:51:54 +00002802 // No code generation needed.
John McCall9d0c6612009-11-17 09:33:40 +00002803 case Decl::UsingShadow:
Douglas Gregor9cfbe482009-06-20 00:51:54 +00002804 case Decl::Using:
Douglas Gregordd9967a2009-09-02 23:49:23 +00002805 case Decl::UsingDirective:
Douglas Gregor127102b2009-06-29 20:59:39 +00002806 case Decl::ClassTemplate:
2807 case Decl::FunctionTemplate:
Richard Smith3e4c6c42011-05-05 21:57:07 +00002808 case Decl::TypeAliasTemplate:
Anders Carlsson018837b2009-09-23 19:19:16 +00002809 case Decl::NamespaceAlias:
Douglas Gregor6a576ab2011-06-05 05:04:23 +00002810 case Decl::Block:
Douglas Gregor9cfbe482009-06-20 00:51:54 +00002811 break;
Anders Carlsson95d4e5d2009-04-15 15:55:24 +00002812 case Decl::CXXConstructor:
Anders Carlsson1fe598c2009-11-24 05:16:24 +00002813 // Skip function templates
Francois Pichet8387e2a2011-04-22 22:18:13 +00002814 if (cast<FunctionDecl>(D)->getDescribedFunctionTemplate() ||
2815 cast<FunctionDecl>(D)->isLateTemplateParsed())
Anders Carlsson1fe598c2009-11-24 05:16:24 +00002816 return;
2817
Anders Carlsson95d4e5d2009-04-15 15:55:24 +00002818 EmitCXXConstructors(cast<CXXConstructorDecl>(D));
2819 break;
Anders Carlsson27ae5362009-04-17 01:58:57 +00002820 case Decl::CXXDestructor:
Francois Pichet8387e2a2011-04-22 22:18:13 +00002821 if (cast<FunctionDecl>(D)->isLateTemplateParsed())
2822 return;
Anders Carlsson27ae5362009-04-17 01:58:57 +00002823 EmitCXXDestructors(cast<CXXDestructorDecl>(D));
2824 break;
Anders Carlsson36674d22009-06-11 21:22:55 +00002825
2826 case Decl::StaticAssert:
2827 // Nothing to do.
2828 break;
2829
Anders Carlsson95d4e5d2009-04-15 15:55:24 +00002830 // Objective-C Decls
Mike Stump1eb44332009-09-09 15:08:12 +00002831
Fariborz Jahanian38e24c72009-03-18 22:33:24 +00002832 // Forward declarations, no (immediate) code generation.
Chris Lattner285d0db2009-04-01 02:36:43 +00002833 case Decl::ObjCInterface:
Eric Christopherffb0c3a2012-07-19 22:22:55 +00002834 case Decl::ObjCCategory:
Chris Lattner285d0db2009-04-01 02:36:43 +00002835 break;
2836
Douglas Gregorbd9482d2012-01-01 21:23:57 +00002837 case Decl::ObjCProtocol: {
2838 ObjCProtocolDecl *Proto = cast<ObjCProtocolDecl>(D);
2839 if (Proto->isThisDeclarationADefinition())
2840 ObjCRuntime->GenerateProtocol(Proto);
Daniel Dunbar41071de2008-08-15 23:26:23 +00002841 break;
Douglas Gregorbd9482d2012-01-01 21:23:57 +00002842 }
2843
Daniel Dunbar41071de2008-08-15 23:26:23 +00002844 case Decl::ObjCCategoryImpl:
Daniel Dunbaraf05bb92008-08-26 08:29:31 +00002845 // Categories have properties but don't support synthesize so we
2846 // can ignore them here.
Peter Collingbournee9265232011-07-27 20:29:46 +00002847 ObjCRuntime->GenerateCategory(cast<ObjCCategoryImplDecl>(D));
Daniel Dunbar41071de2008-08-15 23:26:23 +00002848 break;
2849
Daniel Dunbaraf05bb92008-08-26 08:29:31 +00002850 case Decl::ObjCImplementation: {
2851 ObjCImplementationDecl *OMD = cast<ObjCImplementationDecl>(D);
2852 EmitObjCPropertyImplementations(OMD);
Fariborz Jahanian109dfc62010-04-28 21:28:56 +00002853 EmitObjCIvarInitializations(OMD);
Peter Collingbournee9265232011-07-27 20:29:46 +00002854 ObjCRuntime->GenerateClass(OMD);
Eric Christopherbe6c6862012-04-11 05:56:05 +00002855 // Emit global variable debug information.
2856 if (CGDebugInfo *DI = getModuleDebugInfo())
Alexey Samsonov96a66392012-12-03 18:28:12 +00002857 if (getCodeGenOpts().getDebugInfo() >= CodeGenOptions::LimitedDebugInfo)
2858 DI->getOrCreateInterfaceType(getContext().getObjCInterfaceType(
2859 OMD->getClassInterface()), OMD->getLocation());
Daniel Dunbar41071de2008-08-15 23:26:23 +00002860 break;
Mike Stump1eb44332009-09-09 15:08:12 +00002861 }
Daniel Dunbar41071de2008-08-15 23:26:23 +00002862 case Decl::ObjCMethod: {
2863 ObjCMethodDecl *OMD = cast<ObjCMethodDecl>(D);
2864 // If this is not a prototype, emit the body.
Argyrios Kyrtzidis6fb0aee2009-06-30 02:35:26 +00002865 if (OMD->getBody())
Daniel Dunbar41071de2008-08-15 23:26:23 +00002866 CodeGenFunction(*this).GenerateObjCMethod(OMD);
2867 break;
2868 }
Mike Stump1eb44332009-09-09 15:08:12 +00002869 case Decl::ObjCCompatibleAlias:
David Chisnall29254f42012-01-31 18:59:20 +00002870 ObjCRuntime->RegisterAlias(cast<ObjCCompatibleAliasDecl>(D));
Daniel Dunbar41071de2008-08-15 23:26:23 +00002871 break;
2872
Anders Carlsson91e20dd2009-04-02 05:55:18 +00002873 case Decl::LinkageSpec:
2874 EmitLinkageSpec(cast<LinkageSpecDecl>(D));
Daniel Dunbar41071de2008-08-15 23:26:23 +00002875 break;
Daniel Dunbar41071de2008-08-15 23:26:23 +00002876
2877 case Decl::FileScopeAsm: {
2878 FileScopeAsmDecl *AD = cast<FileScopeAsmDecl>(D);
Chris Lattner5f9e2722011-07-23 10:55:15 +00002879 StringRef AsmString = AD->getAsmString()->getString();
Mike Stump1eb44332009-09-09 15:08:12 +00002880
Daniel Dunbar41071de2008-08-15 23:26:23 +00002881 const std::string &S = getModule().getModuleInlineAsm();
2882 if (S.empty())
2883 getModule().setModuleInlineAsm(AsmString);
Joerg Sonnenberger8ce9cca2012-08-10 10:57:52 +00002884 else if (S.end()[-1] == '\n')
Chris Lattner9f5bff02011-07-23 20:04:25 +00002885 getModule().setModuleInlineAsm(S + AsmString.str());
Daniel Dunbar41071de2008-08-15 23:26:23 +00002886 else
Benjamin Kramer8d042582009-12-11 13:33:18 +00002887 getModule().setModuleInlineAsm(S + '\n' + AsmString.str());
Daniel Dunbar41071de2008-08-15 23:26:23 +00002888 break;
2889 }
Mike Stump1eb44332009-09-09 15:08:12 +00002890
Douglas Gregorb6cbe512013-01-14 17:21:00 +00002891 case Decl::Import: {
2892 ImportDecl *Import = cast<ImportDecl>(D);
2893
2894 // Ignore import declarations that come from imported modules.
2895 if (clang::Module *Owner = Import->getOwningModule()) {
2896 if (getLangOpts().CurrentModule.empty() ||
2897 Owner->getTopLevelModule()->Name == getLangOpts().CurrentModule)
2898 break;
2899 }
2900
Douglas Gregor858afb32013-01-14 20:53:57 +00002901 ImportedModules.insert(Import->getImportedModule());
Douglas Gregorb6cbe512013-01-14 17:21:00 +00002902 break;
2903 }
2904
Mike Stump1eb44332009-09-09 15:08:12 +00002905 default:
Mike Stumpf5408fe2009-05-16 07:57:57 +00002906 // Make sure we handled everything we should, every other kind is a
2907 // non-top-level decl. FIXME: Would be nice to have an isTopLevelDeclKind
2908 // function. Need to recode Decl::Kind to do that easily.
Daniel Dunbar41071de2008-08-15 23:26:23 +00002909 assert(isa<TypeDecl>(D) && "Unsupported decl kind");
2910 }
2911}
John McCall744016d2010-07-06 23:57:41 +00002912
2913/// Turns the given pointer into a constant.
2914static llvm::Constant *GetPointerConstant(llvm::LLVMContext &Context,
2915 const void *Ptr) {
2916 uintptr_t PtrInt = reinterpret_cast<uintptr_t>(Ptr);
Chris Lattner2acc6e32011-07-18 04:24:23 +00002917 llvm::Type *i64 = llvm::Type::getInt64Ty(Context);
John McCall744016d2010-07-06 23:57:41 +00002918 return llvm::ConstantInt::get(i64, PtrInt);
2919}
2920
2921static void EmitGlobalDeclMetadata(CodeGenModule &CGM,
2922 llvm::NamedMDNode *&GlobalMetadata,
2923 GlobalDecl D,
2924 llvm::GlobalValue *Addr) {
2925 if (!GlobalMetadata)
2926 GlobalMetadata =
2927 CGM.getModule().getOrInsertNamedMetadata("clang.global.decl.ptrs");
2928
2929 // TODO: should we report variant information for ctors/dtors?
2930 llvm::Value *Ops[] = {
2931 Addr,
2932 GetPointerConstant(CGM.getLLVMContext(), D.getDecl())
2933 };
Jay Foad6f141652011-04-21 19:59:12 +00002934 GlobalMetadata->addOperand(llvm::MDNode::get(CGM.getLLVMContext(), Ops));
John McCall744016d2010-07-06 23:57:41 +00002935}
2936
2937/// Emits metadata nodes associating all the global values in the
2938/// current module with the Decls they came from. This is useful for
2939/// projects using IR gen as a subroutine.
2940///
2941/// Since there's currently no way to associate an MDNode directly
2942/// with an llvm::GlobalValue, we create a global named metadata
2943/// with the name 'clang.global.decl.ptrs'.
2944void CodeGenModule::EmitDeclMetadata() {
2945 llvm::NamedMDNode *GlobalMetadata = 0;
2946
2947 // StaticLocalDeclMap
Chris Lattner5f9e2722011-07-23 10:55:15 +00002948 for (llvm::DenseMap<GlobalDecl,StringRef>::iterator
John McCall744016d2010-07-06 23:57:41 +00002949 I = MangledDeclNames.begin(), E = MangledDeclNames.end();
2950 I != E; ++I) {
2951 llvm::GlobalValue *Addr = getModule().getNamedValue(I->second);
2952 EmitGlobalDeclMetadata(*this, GlobalMetadata, I->first, Addr);
2953 }
2954}
2955
2956/// Emits metadata nodes for all the local variables in the current
2957/// function.
2958void CodeGenFunction::EmitDeclMetadata() {
2959 if (LocalDeclMap.empty()) return;
2960
2961 llvm::LLVMContext &Context = getLLVMContext();
2962
2963 // Find the unique metadata ID for this name.
2964 unsigned DeclPtrKind = Context.getMDKindID("clang.decl.ptr");
2965
2966 llvm::NamedMDNode *GlobalMetadata = 0;
2967
2968 for (llvm::DenseMap<const Decl*, llvm::Value*>::iterator
2969 I = LocalDeclMap.begin(), E = LocalDeclMap.end(); I != E; ++I) {
2970 const Decl *D = I->first;
2971 llvm::Value *Addr = I->second;
2972
2973 if (llvm::AllocaInst *Alloca = dyn_cast<llvm::AllocaInst>(Addr)) {
2974 llvm::Value *DAddr = GetPointerConstant(getLLVMContext(), D);
Jay Foad6f141652011-04-21 19:59:12 +00002975 Alloca->setMetadata(DeclPtrKind, llvm::MDNode::get(Context, DAddr));
John McCall744016d2010-07-06 23:57:41 +00002976 } else if (llvm::GlobalValue *GV = dyn_cast<llvm::GlobalValue>(Addr)) {
2977 GlobalDecl GD = GlobalDecl(cast<VarDecl>(D));
2978 EmitGlobalDeclMetadata(CGM, GlobalMetadata, GD, GV);
2979 }
2980 }
2981}
Daniel Dunbar673431a2010-07-16 00:00:15 +00002982
Nick Lewycky3dc05412011-05-05 00:08:20 +00002983void CodeGenModule::EmitCoverageFile() {
2984 if (!getCodeGenOpts().CoverageFile.empty()) {
Nick Lewycky5ea4f442011-05-04 20:46:58 +00002985 if (llvm::NamedMDNode *CUNode = TheModule.getNamedMetadata("llvm.dbg.cu")) {
2986 llvm::NamedMDNode *GCov = TheModule.getOrInsertNamedMetadata("llvm.gcov");
2987 llvm::LLVMContext &Ctx = TheModule.getContext();
Nick Lewycky3dc05412011-05-05 00:08:20 +00002988 llvm::MDString *CoverageFile =
2989 llvm::MDString::get(Ctx, getCodeGenOpts().CoverageFile);
Nick Lewycky5ea4f442011-05-04 20:46:58 +00002990 for (int i = 0, e = CUNode->getNumOperands(); i != e; ++i) {
2991 llvm::MDNode *CU = CUNode->getOperand(i);
Nick Lewycky3dc05412011-05-05 00:08:20 +00002992 llvm::Value *node[] = { CoverageFile, CU };
Nick Lewycky5ea4f442011-05-04 20:46:58 +00002993 llvm::MDNode *N = llvm::MDNode::get(Ctx, node);
2994 GCov->addOperand(N);
2995 }
2996 }
2997 }
2998}
Nico Weberc5f80462012-10-11 10:13:44 +00002999
3000llvm::Constant *CodeGenModule::EmitUuidofInitializer(StringRef Uuid,
3001 QualType GuidType) {
3002 // Sema has checked that all uuid strings are of the form
3003 // "12345678-1234-1234-1234-1234567890ab".
3004 assert(Uuid.size() == 36);
3005 const char *Uuidstr = Uuid.data();
3006 for (int i = 0; i < 36; ++i) {
3007 if (i == 8 || i == 13 || i == 18 || i == 23) assert(Uuidstr[i] == '-');
3008 else assert(isxdigit(Uuidstr[i]));
3009 }
3010
3011 llvm::APInt Field0(32, StringRef(Uuidstr , 8), 16);
3012 llvm::APInt Field1(16, StringRef(Uuidstr + 9, 4), 16);
3013 llvm::APInt Field2(16, StringRef(Uuidstr + 14, 4), 16);
Nico Weber193646f2012-10-17 00:34:34 +00003014 static const int Field3ValueOffsets[] = { 19, 21, 24, 26, 28, 30, 32, 34 };
Nico Weberc5f80462012-10-11 10:13:44 +00003015
3016 APValue InitStruct(APValue::UninitStruct(), /*NumBases=*/0, /*NumFields=*/4);
3017 InitStruct.getStructField(0) = APValue(llvm::APSInt(Field0));
3018 InitStruct.getStructField(1) = APValue(llvm::APSInt(Field1));
3019 InitStruct.getStructField(2) = APValue(llvm::APSInt(Field2));
3020 APValue& Arr = InitStruct.getStructField(3);
3021 Arr = APValue(APValue::UninitArray(), 8, 8);
3022 for (int t = 0; t < 8; ++t)
Nico Weber43085812012-10-13 21:56:05 +00003023 Arr.getArrayInitializedElt(t) = APValue(llvm::APSInt(
3024 llvm::APInt(8, StringRef(Uuidstr + Field3ValueOffsets[t], 2), 16)));
Nico Weberc5f80462012-10-11 10:13:44 +00003025
3026 return EmitConstantValue(InitStruct, GuidType);
3027}