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Reid Spencer5f016e22007-07-11 17:01:13 +00001//===--- CodeGenModule.cpp - Emit LLVM Code from ASTs for a Module --------===//
2//
3// The LLVM Compiler Infrastructure
4//
Chris Lattner0bc735f2007-12-29 19:59:25 +00005// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
Reid Spencer5f016e22007-07-11 17:01:13 +00007//
8//===----------------------------------------------------------------------===//
9//
10// This coordinates the per-module state used while generating code.
11//
12//===----------------------------------------------------------------------===//
13
14#include "CodeGenModule.h"
Peter Collingbourne6c0aa5f2011-10-06 18:29:37 +000015#include "CGCUDARuntime.h"
John McCall4c40d982010-08-31 07:33:07 +000016#include "CGCXXABI.h"
Chandler Carruth55fc8732012-12-04 09:13:33 +000017#include "CGCall.h"
18#include "CGDebugInfo.h"
Daniel Dunbaraf2f62c2008-08-13 00:59:25 +000019#include "CGObjCRuntime.h"
Peter Collingbourne8c25fc52011-09-19 21:14:35 +000020#include "CGOpenCLRuntime.h"
Chandler Carruth55fc8732012-12-04 09:13:33 +000021#include "CodeGenFunction.h"
22#include "CodeGenTBAA.h"
Anton Korobeynikov82d0a412010-01-10 12:58:08 +000023#include "TargetInfo.h"
Reid Spencer5f016e22007-07-11 17:01:13 +000024#include "clang/AST/ASTContext.h"
Ken Dyck687cc4a2010-01-26 13:48:07 +000025#include "clang/AST/CharUnits.h"
Chris Lattner21ef7ae2008-11-04 16:51:42 +000026#include "clang/AST/DeclCXX.h"
Chandler Carruth55fc8732012-12-04 09:13:33 +000027#include "clang/AST/DeclObjC.h"
Douglas Gregoraf896892010-06-21 18:41:26 +000028#include "clang/AST/DeclTemplate.h"
Peter Collingbourne14110472011-01-13 18:57:25 +000029#include "clang/AST/Mangle.h"
Anders Carlsson1a5e0d72009-11-30 23:41:22 +000030#include "clang/AST/RecordLayout.h"
Rafael Espindolaa411d2f2011-10-26 20:41:06 +000031#include "clang/AST/RecursiveASTVisitor.h"
Rafael Espindolabcf6b982011-12-19 14:41:01 +000032#include "clang/Basic/Builtins.h"
Jordan Rose3f6f51e2013-02-08 22:30:41 +000033#include "clang/Basic/CharInfo.h"
Chris Lattner2c8569d2007-12-02 07:19:18 +000034#include "clang/Basic/Diagnostic.h"
Douglas Gregorb6cbe512013-01-14 17:21:00 +000035#include "clang/Basic/Module.h"
Nate Begeman8bd4afe2008-04-19 04:17:09 +000036#include "clang/Basic/SourceManager.h"
Reid Spencer5f016e22007-07-11 17:01:13 +000037#include "clang/Basic/TargetInfo.h"
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"
Dmitri Gribenkocb5620c2013-01-30 12:06:08 +000047#include "llvm/Support/ConvertUTF.h"
Chris Lattner78f7ece2009-11-07 09:22:46 +000048#include "llvm/Support/ErrorHandling.h"
Chandler Carruth55fc8732012-12-04 09:13:33 +000049#include "llvm/Target/Mangler.h"
Dmitri Gribenkocb5620c2013-01-30 12:06:08 +000050
Reid Spencer5f016e22007-07-11 17:01:13 +000051using namespace clang;
52using namespace CodeGen;
53
Julien Lerouge77f68bb2011-09-09 22:41:49 +000054static const char AnnotationSection[] = "llvm.metadata";
55
John McCallf16aa102010-08-22 21:01:12 +000056static CGCXXABI &createCXXABI(CodeGenModule &CGM) {
John McCall64aa4b32013-04-16 22:48:15 +000057 switch (CGM.getTarget().getCXXABI().getKind()) {
Tim Northoverc264e162013-01-31 12:13:10 +000058 case TargetCXXABI::GenericAArch64:
John McCall96fcde02013-01-25 23:36:14 +000059 case TargetCXXABI::GenericARM:
60 case TargetCXXABI::iOS:
61 case TargetCXXABI::GenericItanium:
62 return *CreateItaniumCXXABI(CGM);
63 case TargetCXXABI::Microsoft:
64 return *CreateMicrosoftCXXABI(CGM);
John McCallf16aa102010-08-22 21:01:12 +000065 }
66
67 llvm_unreachable("invalid C++ ABI kind");
John McCallf16aa102010-08-22 21:01:12 +000068}
69
Reid Spencer5f016e22007-07-11 17:01:13 +000070
Chandler Carruth2811ccf2009-11-12 17:24:48 +000071CodeGenModule::CodeGenModule(ASTContext &C, const CodeGenOptions &CGO,
John McCall3abae092013-04-16 22:48:20 +000072 llvm::Module &M, const llvm::DataLayout &TD,
David Blaikied6471f72011-09-25 23:23:43 +000073 DiagnosticsEngine &diags)
John McCall64aa4b32013-04-16 22:48:15 +000074 : Context(C), LangOpts(C.getLangOpts()), CodeGenOpts(CGO), TheModule(M),
75 Diags(diags), TheDataLayout(TD), Target(C.getTargetInfo()),
76 ABI(createCXXABI(*this)), VMContext(M.getContext()), TBAA(0),
77 TheTargetCodeGenInfo(0), Types(*this), VTables(*this),
78 ObjCRuntime(0), OpenCLRuntime(0), CUDARuntime(0),
Dan Gohmanb49bd272012-02-16 00:57:37 +000079 DebugInfo(0), ARCData(0), NoObjCARCExceptionsMetadata(0),
80 RRData(0), CFConstantStringClassRef(0),
Peter Collingbourne6c0aa5f2011-10-06 18:29:37 +000081 ConstantStringClassRef(0), NSConstantStringType(0),
Daniel Dunbar673431a2010-07-16 00:00:15 +000082 NSConcreteGlobalBlock(0), NSConcreteStackBlock(0),
John McCalld16c2cf2011-02-08 08:22:06 +000083 BlockObjectAssign(0), BlockObjectDispose(0),
Will Dietz4f45bc02013-01-18 11:30:38 +000084 BlockDescriptorType(0), GenericBlockLiteralType(0),
Nadav Rotem495cfa42013-03-23 06:43:35 +000085 LifetimeStartFn(0), LifetimeEndFn(0),
Will Dietz4f45bc02013-01-18 11:30:38 +000086 SanitizerBlacklist(CGO.SanitizerBlacklistFile),
87 SanOpts(SanitizerBlacklist.isIn(M) ?
88 SanitizerOptions::Disabled : LangOpts.Sanitize) {
89
Chris Lattner8b418682012-02-07 00:39:47 +000090 // Initialize the type cache.
91 llvm::LLVMContext &LLVMContext = M.getContext();
92 VoidTy = llvm::Type::getVoidTy(LLVMContext);
93 Int8Ty = llvm::Type::getInt8Ty(LLVMContext);
94 Int16Ty = llvm::Type::getInt16Ty(LLVMContext);
95 Int32Ty = llvm::Type::getInt32Ty(LLVMContext);
96 Int64Ty = llvm::Type::getInt64Ty(LLVMContext);
97 FloatTy = llvm::Type::getFloatTy(LLVMContext);
98 DoubleTy = llvm::Type::getDoubleTy(LLVMContext);
99 PointerWidthInBits = C.getTargetInfo().getPointerWidth(0);
100 PointerAlignInBytes =
101 C.toCharUnitsFromBits(C.getTargetInfo().getPointerAlign(0)).getQuantity();
102 IntTy = llvm::IntegerType::get(LLVMContext, C.getTargetInfo().getIntWidth());
103 IntPtrTy = llvm::IntegerType::get(LLVMContext, PointerWidthInBits);
104 Int8PtrTy = Int8Ty->getPointerTo(0);
105 Int8PtrPtrTy = Int8PtrTy->getPointerTo(0);
106
John McCallbd7370a2013-02-28 19:01:20 +0000107 RuntimeCC = getTargetCodeGenInfo().getABIInfo().getRuntimeCC();
108
David Blaikie4e4d0842012-03-11 07:00:24 +0000109 if (LangOpts.ObjC1)
Peter Collingbourne8c25fc52011-09-19 21:14:35 +0000110 createObjCRuntime();
David Blaikie4e4d0842012-03-11 07:00:24 +0000111 if (LangOpts.OpenCL)
Peter Collingbourne8c25fc52011-09-19 21:14:35 +0000112 createOpenCLRuntime();
David Blaikie4e4d0842012-03-11 07:00:24 +0000113 if (LangOpts.CUDA)
Peter Collingbourne6c0aa5f2011-10-06 18:29:37 +0000114 createCUDARuntime();
Sanjiv Guptae8b9f5b2008-05-08 08:54:20 +0000115
Kostya Serebryanyc9fe6052012-04-24 06:57:01 +0000116 // Enable TBAA unless it's suppressed. ThreadSanitizer needs TBAA even at O0.
Will Dietz4f45bc02013-01-18 11:30:38 +0000117 if (SanOpts.Thread ||
Kostya Serebryanyc9fe6052012-04-24 06:57:01 +0000118 (!CodeGenOpts.RelaxedAliasing && CodeGenOpts.OptimizationLevel > 0))
119 TBAA = new CodeGenTBAA(Context, VMContext, CodeGenOpts, getLangOpts(),
Dan Gohman0b5c4fc2010-10-15 20:23:12 +0000120 ABI.getMangleContext());
Dan Gohman3d5aff52010-10-14 23:06:10 +0000121
Nick Lewyckye8ba8d72011-04-21 23:44:07 +0000122 // If debug info or coverage generation is enabled, create the CGDebugInfo
123 // object.
Douglas Gregor4cdad312012-10-23 20:05:01 +0000124 if (CodeGenOpts.getDebugInfo() != CodeGenOptions::NoDebugInfo ||
Alexey Samsonov3a70cd62012-04-27 07:24:20 +0000125 CodeGenOpts.EmitGcovArcs ||
Nick Lewyckye8ba8d72011-04-21 23:44:07 +0000126 CodeGenOpts.EmitGcovNotes)
127 DebugInfo = new CGDebugInfo(*this);
John McCalld16c2cf2011-02-08 08:22:06 +0000128
129 Block.GlobalUniqueCount = 0;
John McCall5936e332011-02-15 09:22:45 +0000130
David Blaikie4e4d0842012-03-11 07:00:24 +0000131 if (C.getLangOpts().ObjCAutoRefCount)
John McCallf85e1932011-06-15 23:02:42 +0000132 ARCData = new ARCEntrypoints();
133 RRData = new RREntrypoints();
Chris Lattner2b94fe32008-03-01 08:45:05 +0000134}
135
136CodeGenModule::~CodeGenModule() {
Peter Collingbournee9265232011-07-27 20:29:46 +0000137 delete ObjCRuntime;
Peter Collingbourne8c25fc52011-09-19 21:14:35 +0000138 delete OpenCLRuntime;
Peter Collingbourne6c0aa5f2011-10-06 18:29:37 +0000139 delete CUDARuntime;
Ted Kremenek0628b722011-10-08 05:28:26 +0000140 delete TheTargetCodeGenInfo;
John McCallf16aa102010-08-22 21:01:12 +0000141 delete &ABI;
Dan Gohman4376c852010-10-15 18:04:46 +0000142 delete TBAA;
Ted Kremenek815c78f2008-08-05 18:50:11 +0000143 delete DebugInfo;
John McCallf85e1932011-06-15 23:02:42 +0000144 delete ARCData;
145 delete RRData;
Ted Kremenek815c78f2008-08-05 18:50:11 +0000146}
147
David Chisnall0d13f6f2010-01-23 02:40:42 +0000148void CodeGenModule::createObjCRuntime() {
John McCall260611a2012-06-20 06:18:46 +0000149 // This is just isGNUFamily(), but we want to force implementors of
150 // new ABIs to decide how best to do this.
151 switch (LangOpts.ObjCRuntime.getKind()) {
David Chisnall11d3f4c2012-07-03 20:49:52 +0000152 case ObjCRuntime::GNUstep:
153 case ObjCRuntime::GCC:
John McCallf7226fb2012-07-12 02:07:58 +0000154 case ObjCRuntime::ObjFW:
Peter Collingbournee9265232011-07-27 20:29:46 +0000155 ObjCRuntime = CreateGNUObjCRuntime(*this);
John McCall260611a2012-06-20 06:18:46 +0000156 return;
157
158 case ObjCRuntime::FragileMacOSX:
159 case ObjCRuntime::MacOSX:
160 case ObjCRuntime::iOS:
Peter Collingbournee9265232011-07-27 20:29:46 +0000161 ObjCRuntime = CreateMacObjCRuntime(*this);
John McCall260611a2012-06-20 06:18:46 +0000162 return;
163 }
164 llvm_unreachable("bad runtime kind");
David Chisnall0d13f6f2010-01-23 02:40:42 +0000165}
166
Peter Collingbourne8c25fc52011-09-19 21:14:35 +0000167void CodeGenModule::createOpenCLRuntime() {
168 OpenCLRuntime = new CGOpenCLRuntime(*this);
169}
170
Peter Collingbourne6c0aa5f2011-10-06 18:29:37 +0000171void CodeGenModule::createCUDARuntime() {
172 CUDARuntime = CreateNVCUDARuntime(*this);
173}
174
Ted Kremenek815c78f2008-08-05 18:50:11 +0000175void CodeGenModule::Release() {
Chris Lattner82227ff2009-03-22 21:21:57 +0000176 EmitDeferred();
Eli Friedman6c6bda32010-01-08 00:50:11 +0000177 EmitCXXGlobalInitFunc();
Daniel Dunbarefb0fa92010-03-20 04:15:41 +0000178 EmitCXXGlobalDtorFunc();
Richard Smithb80a16e2013-04-19 16:42:07 +0000179 EmitCXXThreadLocalInitFunc();
Peter Collingbournee9265232011-07-27 20:29:46 +0000180 if (ObjCRuntime)
181 if (llvm::Function *ObjCInitFunction = ObjCRuntime->ModuleInitFunction())
Daniel Dunbar208ff5e2008-08-11 18:12:00 +0000182 AddGlobalCtor(ObjCInitFunction);
Daniel Dunbar6bfed7e2008-08-01 00:01:51 +0000183 EmitCtorList(GlobalCtors, "llvm.global_ctors");
184 EmitCtorList(GlobalDtors, "llvm.global_dtors");
Julien Lerouge77f68bb2011-09-09 22:41:49 +0000185 EmitGlobalAnnotations();
Richard Smith00249372013-04-06 05:00:46 +0000186 EmitStaticExternCAliases();
Daniel Dunbar02698712009-02-13 20:29:50 +0000187 EmitLLVMUsed();
Douglas Gregorf43b7212013-01-16 01:23:41 +0000188
Reid Kleckner3190ca92013-05-08 13:44:39 +0000189 if (CodeGenOpts.Autolink &&
190 (Context.getLangOpts().Modules || !LinkerOptionsMetadata.empty())) {
Douglas Gregorf43b7212013-01-16 01:23:41 +0000191 EmitModuleLinkOptions();
192 }
Manman Renfc0f91c2013-06-19 01:46:49 +0000193 if (CodeGenOpts.DwarfVersion)
194 // We actually want the latest version when there are conflicts.
195 // We can change from Warning to Latest if such mode is supported.
196 getModule().addModuleFlag(llvm::Module::Warning, "Dwarf Version",
197 CodeGenOpts.DwarfVersion);
Douglas Gregor5d75ea72013-01-14 18:28:43 +0000198
John McCallb2593832010-09-16 06:16:50 +0000199 SimplifyPersonality();
200
John McCall744016d2010-07-06 23:57:41 +0000201 if (getCodeGenOpts().EmitDeclMetadata)
202 EmitDeclMetadata();
Nick Lewycky5ea4f442011-05-04 20:46:58 +0000203
204 if (getCodeGenOpts().EmitGcovArcs || getCodeGenOpts().EmitGcovNotes)
Nick Lewycky3dc05412011-05-05 00:08:20 +0000205 EmitCoverageFile();
Devang Patelf391dbe2011-08-16 20:58:22 +0000206
207 if (DebugInfo)
208 DebugInfo->finalize();
Daniel Dunbarf1968f22008-10-01 00:49:24 +0000209}
210
Devang Patele80d5672011-03-23 16:29:39 +0000211void CodeGenModule::UpdateCompletedType(const TagDecl *TD) {
212 // Make sure that this type is translated.
213 Types.UpdateCompletedType(TD);
Devang Patele80d5672011-03-23 16:29:39 +0000214}
215
Dan Gohman3d5aff52010-10-14 23:06:10 +0000216llvm::MDNode *CodeGenModule::getTBAAInfo(QualType QTy) {
217 if (!TBAA)
218 return 0;
219 return TBAA->getTBAAInfo(QTy);
220}
221
Kostya Serebryany8cb4a072012-03-26 17:03:51 +0000222llvm::MDNode *CodeGenModule::getTBAAInfoForVTablePtr() {
223 if (!TBAA)
224 return 0;
225 return TBAA->getTBAAInfoForVTablePtr();
226}
227
Dan Gohmanb22c7dc2012-09-28 21:58:29 +0000228llvm::MDNode *CodeGenModule::getTBAAStructInfo(QualType QTy) {
229 if (!TBAA)
230 return 0;
231 return TBAA->getTBAAStructInfo(QTy);
232}
233
Manman Renb37a73d2013-04-04 21:53:22 +0000234llvm::MDNode *CodeGenModule::getTBAAStructTypeInfo(QualType QTy) {
235 if (!TBAA)
236 return 0;
237 return TBAA->getTBAAStructTypeInfo(QTy);
238}
239
240llvm::MDNode *CodeGenModule::getTBAAStructTagInfo(QualType BaseTy,
241 llvm::MDNode *AccessN,
242 uint64_t O) {
243 if (!TBAA)
244 return 0;
245 return TBAA->getTBAAStructTagInfo(BaseTy, AccessN, O);
246}
247
Manman Renca835182013-04-11 23:02:56 +0000248/// Decorate the instruction with a TBAA tag. For scalar TBAA, the tag
249/// is the same as the type. For struct-path aware TBAA, the tag
250/// is different from the type: base type, access type and offset.
251/// When ConvertTypeToTag is true, we create a tag based on the scalar type.
Dan Gohman3d5aff52010-10-14 23:06:10 +0000252void CodeGenModule::DecorateInstruction(llvm::Instruction *Inst,
Manman Renca835182013-04-11 23:02:56 +0000253 llvm::MDNode *TBAAInfo,
254 bool ConvertTypeToTag) {
255 if (ConvertTypeToTag && TBAA && CodeGenOpts.StructPathTBAA)
256 Inst->setMetadata(llvm::LLVMContext::MD_tbaa,
257 TBAA->getTBAAScalarTagInfo(TBAAInfo));
258 else
259 Inst->setMetadata(llvm::LLVMContext::MD_tbaa, TBAAInfo);
Dan Gohman3d5aff52010-10-14 23:06:10 +0000260}
261
Chandler Carruth0f30a122012-03-30 19:44:53 +0000262void CodeGenModule::Error(SourceLocation loc, StringRef error) {
263 unsigned diagID = getDiags().getCustomDiagID(DiagnosticsEngine::Error, error);
John McCall32096692011-03-18 02:56:14 +0000264 getDiags().Report(Context.getFullLoc(loc), diagID);
265}
266
Daniel Dunbar488e9932008-08-16 00:56:44 +0000267/// ErrorUnsupported - Print out an error that codegen doesn't support the
Chris Lattner2c8569d2007-12-02 07:19:18 +0000268/// specified stmt yet.
Daniel Dunbar90df4b62008-09-04 03:43:08 +0000269void CodeGenModule::ErrorUnsupported(const Stmt *S, const char *Type,
270 bool OmitOnError) {
271 if (OmitOnError && getDiags().hasErrorOccurred())
272 return;
David Blaikied6471f72011-09-25 23:23:43 +0000273 unsigned DiagID = getDiags().getCustomDiagID(DiagnosticsEngine::Error,
Daniel Dunbar56b80012009-02-06 19:18:03 +0000274 "cannot compile this %0 yet");
Chris Lattner2c8569d2007-12-02 07:19:18 +0000275 std::string Msg = Type;
Chris Lattner0a14eee2008-11-18 07:04:44 +0000276 getDiags().Report(Context.getFullLoc(S->getLocStart()), DiagID)
277 << Msg << S->getSourceRange();
Chris Lattner2c8569d2007-12-02 07:19:18 +0000278}
Chris Lattner58c3f9e2007-12-02 06:27:33 +0000279
Daniel Dunbar488e9932008-08-16 00:56:44 +0000280/// ErrorUnsupported - Print out an error that codegen doesn't support the
Chris Lattnerc6fdc342008-01-12 07:05:38 +0000281/// specified decl yet.
Daniel Dunbar90df4b62008-09-04 03:43:08 +0000282void CodeGenModule::ErrorUnsupported(const Decl *D, const char *Type,
283 bool OmitOnError) {
284 if (OmitOnError && getDiags().hasErrorOccurred())
285 return;
David Blaikied6471f72011-09-25 23:23:43 +0000286 unsigned DiagID = getDiags().getCustomDiagID(DiagnosticsEngine::Error,
Daniel Dunbar56b80012009-02-06 19:18:03 +0000287 "cannot compile this %0 yet");
Chris Lattnerc6fdc342008-01-12 07:05:38 +0000288 std::string Msg = Type;
Chris Lattner0a14eee2008-11-18 07:04:44 +0000289 getDiags().Report(Context.getFullLoc(D->getLocation()), DiagID) << Msg;
Chris Lattnerc6fdc342008-01-12 07:05:38 +0000290}
291
John McCallbc8d40d2011-06-24 21:55:10 +0000292llvm::ConstantInt *CodeGenModule::getSize(CharUnits size) {
293 return llvm::ConstantInt::get(SizeTy, size.getQuantity());
294}
295
Mike Stump1eb44332009-09-09 15:08:12 +0000296void CodeGenModule::setGlobalVisibility(llvm::GlobalValue *GV,
Anders Carlsson0ffeaad2011-01-29 19:39:23 +0000297 const NamedDecl *D) const {
Daniel Dunbar04d40782009-04-14 06:00:08 +0000298 // Internal definitions always have default visibility.
Chris Lattnerdf102fc2009-04-14 05:27:13 +0000299 if (GV->hasLocalLinkage()) {
Daniel Dunbar7e714cd2009-04-10 20:26:50 +0000300 GV->setVisibility(llvm::GlobalValue::DefaultVisibility);
Daniel Dunbar6ab187a2009-04-07 05:48:37 +0000301 return;
Daniel Dunbar7e714cd2009-04-10 20:26:50 +0000302 }
Daniel Dunbar6ab187a2009-04-07 05:48:37 +0000303
John McCallaf146032010-10-30 11:50:40 +0000304 // Set visibility for definitions.
Rafael Espindola2beda122013-02-27 02:15:29 +0000305 LinkageInfo LV = D->getLinkageAndVisibility();
Rafael Espindolaf127eb82013-02-27 02:56:45 +0000306 if (LV.isVisibilityExplicit() || !GV->hasAvailableExternallyLinkage())
307 GV->setVisibility(GetLLVMVisibility(LV.getVisibility()));
Dan Gohman4f8d1232008-05-22 00:50:06 +0000308}
309
Hans Wennborgde981f32012-06-28 08:01:44 +0000310static llvm::GlobalVariable::ThreadLocalMode GetLLVMTLSModel(StringRef S) {
311 return llvm::StringSwitch<llvm::GlobalVariable::ThreadLocalMode>(S)
312 .Case("global-dynamic", llvm::GlobalVariable::GeneralDynamicTLSModel)
313 .Case("local-dynamic", llvm::GlobalVariable::LocalDynamicTLSModel)
314 .Case("initial-exec", llvm::GlobalVariable::InitialExecTLSModel)
315 .Case("local-exec", llvm::GlobalVariable::LocalExecTLSModel);
316}
317
318static llvm::GlobalVariable::ThreadLocalMode GetLLVMTLSModel(
319 CodeGenOptions::TLSModel M) {
320 switch (M) {
321 case CodeGenOptions::GeneralDynamicTLSModel:
322 return llvm::GlobalVariable::GeneralDynamicTLSModel;
323 case CodeGenOptions::LocalDynamicTLSModel:
324 return llvm::GlobalVariable::LocalDynamicTLSModel;
325 case CodeGenOptions::InitialExecTLSModel:
326 return llvm::GlobalVariable::InitialExecTLSModel;
327 case CodeGenOptions::LocalExecTLSModel:
328 return llvm::GlobalVariable::LocalExecTLSModel;
329 }
330 llvm_unreachable("Invalid TLS model!");
331}
332
333void CodeGenModule::setTLSMode(llvm::GlobalVariable *GV,
334 const VarDecl &D) const {
Richard Smith38afbc72013-04-13 02:43:54 +0000335 assert(D.getTLSKind() && "setting TLS mode on non-TLS var!");
Hans Wennborgde981f32012-06-28 08:01:44 +0000336
337 llvm::GlobalVariable::ThreadLocalMode TLM;
Douglas Gregor4cdad312012-10-23 20:05:01 +0000338 TLM = GetLLVMTLSModel(CodeGenOpts.getDefaultTLSModel());
Hans Wennborgde981f32012-06-28 08:01:44 +0000339
340 // Override the TLS model if it is explicitly specified.
341 if (D.hasAttr<TLSModelAttr>()) {
342 const TLSModelAttr *Attr = D.getAttr<TLSModelAttr>();
343 TLM = GetLLVMTLSModel(Attr->getModel());
344 }
345
346 GV->setThreadLocalMode(TLM);
347}
348
John McCallcbfe5022010-08-04 08:34:44 +0000349/// Set the symbol visibility of type information (vtable and RTTI)
350/// associated with the given type.
351void CodeGenModule::setTypeVisibility(llvm::GlobalValue *GV,
352 const CXXRecordDecl *RD,
Anders Carlssonfa2e99f2011-01-29 20:24:48 +0000353 TypeVisibilityKind TVK) const {
Anders Carlsson0ffeaad2011-01-29 19:39:23 +0000354 setGlobalVisibility(GV, RD);
John McCallcbfe5022010-08-04 08:34:44 +0000355
John McCall279b5eb2010-08-12 23:36:15 +0000356 if (!CodeGenOpts.HiddenWeakVTables)
357 return;
358
Anders Carlsson9a86a132011-01-29 20:36:11 +0000359 // We never want to drop the visibility for RTTI names.
360 if (TVK == TVK_ForRTTIName)
361 return;
362
John McCallcbfe5022010-08-04 08:34:44 +0000363 // We want to drop the visibility to hidden for weak type symbols.
364 // This isn't possible if there might be unresolved references
365 // elsewhere that rely on this symbol being visible.
366
John McCall7a536902010-08-05 20:39:18 +0000367 // This should be kept roughly in sync with setThunkVisibility
368 // in CGVTables.cpp.
369
John McCallcbfe5022010-08-04 08:34:44 +0000370 // Preconditions.
Anders Carlssonf502d932011-01-24 00:46:19 +0000371 if (GV->getLinkage() != llvm::GlobalVariable::LinkOnceODRLinkage ||
John McCallcbfe5022010-08-04 08:34:44 +0000372 GV->getVisibility() != llvm::GlobalVariable::DefaultVisibility)
373 return;
374
375 // Don't override an explicit visibility attribute.
John McCalld4c3d662013-02-20 01:54:26 +0000376 if (RD->getExplicitVisibility(NamedDecl::VisibilityForType))
John McCallcbfe5022010-08-04 08:34:44 +0000377 return;
378
379 switch (RD->getTemplateSpecializationKind()) {
380 // We have to disable the optimization if this is an EI definition
381 // because there might be EI declarations in other shared objects.
382 case TSK_ExplicitInstantiationDefinition:
383 case TSK_ExplicitInstantiationDeclaration:
384 return;
385
John McCall7a536902010-08-05 20:39:18 +0000386 // Every use of a non-template class's type information has to emit it.
John McCallcbfe5022010-08-04 08:34:44 +0000387 case TSK_Undeclared:
388 break;
389
John McCall7a536902010-08-05 20:39:18 +0000390 // In theory, implicit instantiations can ignore the possibility of
391 // an explicit instantiation declaration because there necessarily
392 // must be an EI definition somewhere with default visibility. In
393 // practice, it's possible to have an explicit instantiation for
394 // an arbitrary template class, and linkers aren't necessarily able
395 // to deal with mixed-visibility symbols.
396 case TSK_ExplicitSpecialization:
John McCallcbfe5022010-08-04 08:34:44 +0000397 case TSK_ImplicitInstantiation:
Douglas Gregoraafd1112012-10-24 14:11:55 +0000398 return;
John McCallcbfe5022010-08-04 08:34:44 +0000399 }
400
401 // If there's a key function, there may be translation units
402 // that don't have the key function's definition. But ignore
403 // this if we're emitting RTTI under -fno-rtti.
David Blaikie4e4d0842012-03-11 07:00:24 +0000404 if (!(TVK != TVK_ForRTTI) || LangOpts.RTTI) {
John McCalld5617ee2013-01-25 22:31:03 +0000405 // FIXME: what should we do if we "lose" the key function during
406 // the emission of the file?
407 if (Context.getCurrentKeyFunction(RD))
John McCallcbfe5022010-08-04 08:34:44 +0000408 return;
Anders Carlssonfa2e99f2011-01-29 20:24:48 +0000409 }
John McCallcbfe5022010-08-04 08:34:44 +0000410
411 // Otherwise, drop the visibility to hidden.
412 GV->setVisibility(llvm::GlobalValue::HiddenVisibility);
Rafael Espindolab1c65ff2011-01-11 21:44:37 +0000413 GV->setUnnamedAddr(true);
John McCallcbfe5022010-08-04 08:34:44 +0000414}
415
Chris Lattner5f9e2722011-07-23 10:55:15 +0000416StringRef CodeGenModule::getMangledName(GlobalDecl GD) {
Anders Carlsson793a9902010-06-22 16:05:32 +0000417 const NamedDecl *ND = cast<NamedDecl>(GD.getDecl());
418
Chris Lattner5f9e2722011-07-23 10:55:15 +0000419 StringRef &Str = MangledDeclNames[GD.getCanonicalDecl()];
Anders Carlsson793a9902010-06-22 16:05:32 +0000420 if (!Str.empty())
421 return Str;
422
John McCall4c40d982010-08-31 07:33:07 +0000423 if (!getCXXABI().getMangleContext().shouldMangleDeclName(ND)) {
Anders Carlsson793a9902010-06-22 16:05:32 +0000424 IdentifierInfo *II = ND->getIdentifier();
425 assert(II && "Attempt to mangle unnamed decl.");
426
427 Str = II->getName();
428 return Str;
429 }
430
Dylan Noblesmithf7ccbad2012-02-05 02:13:05 +0000431 SmallString<256> Buffer;
Rafael Espindolac4850c22011-02-10 23:59:36 +0000432 llvm::raw_svector_ostream Out(Buffer);
Anders Carlsson793a9902010-06-22 16:05:32 +0000433 if (const CXXConstructorDecl *D = dyn_cast<CXXConstructorDecl>(ND))
Rafael Espindolac4850c22011-02-10 23:59:36 +0000434 getCXXABI().getMangleContext().mangleCXXCtor(D, GD.getCtorType(), Out);
Anders Carlsson793a9902010-06-22 16:05:32 +0000435 else if (const CXXDestructorDecl *D = dyn_cast<CXXDestructorDecl>(ND))
Rafael Espindolac4850c22011-02-10 23:59:36 +0000436 getCXXABI().getMangleContext().mangleCXXDtor(D, GD.getDtorType(), Out);
Anders Carlsson793a9902010-06-22 16:05:32 +0000437 else if (const BlockDecl *BD = dyn_cast<BlockDecl>(ND))
Fariborz Jahanian4904bf42012-06-26 16:06:38 +0000438 getCXXABI().getMangleContext().mangleBlock(BD, Out,
439 dyn_cast_or_null<VarDecl>(initializedGlobalDecl.getDecl()));
Anders Carlsson793a9902010-06-22 16:05:32 +0000440 else
Rafael Espindolac4850c22011-02-10 23:59:36 +0000441 getCXXABI().getMangleContext().mangleName(ND, Out);
Anders Carlsson793a9902010-06-22 16:05:32 +0000442
443 // Allocate space for the mangled name.
Rafael Espindolac4850c22011-02-10 23:59:36 +0000444 Out.flush();
Anders Carlsson793a9902010-06-22 16:05:32 +0000445 size_t Length = Buffer.size();
446 char *Name = MangledNamesAllocator.Allocate<char>(Length);
447 std::copy(Buffer.begin(), Buffer.end(), Name);
448
Chris Lattner5f9e2722011-07-23 10:55:15 +0000449 Str = StringRef(Name, Length);
Anders Carlsson793a9902010-06-22 16:05:32 +0000450
451 return Str;
452}
453
Peter Collingbourne14110472011-01-13 18:57:25 +0000454void CodeGenModule::getBlockMangledName(GlobalDecl GD, MangleBuffer &Buffer,
455 const BlockDecl *BD) {
456 MangleContext &MangleCtx = getCXXABI().getMangleContext();
457 const Decl *D = GD.getDecl();
Rafael Espindolac4850c22011-02-10 23:59:36 +0000458 llvm::raw_svector_ostream Out(Buffer.getBuffer());
Peter Collingbourne14110472011-01-13 18:57:25 +0000459 if (D == 0)
Fariborz Jahanian4904bf42012-06-26 16:06:38 +0000460 MangleCtx.mangleGlobalBlock(BD,
461 dyn_cast_or_null<VarDecl>(initializedGlobalDecl.getDecl()), Out);
Peter Collingbourne14110472011-01-13 18:57:25 +0000462 else if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(D))
Rafael Espindolac4850c22011-02-10 23:59:36 +0000463 MangleCtx.mangleCtorBlock(CD, GD.getCtorType(), BD, Out);
Peter Collingbourne14110472011-01-13 18:57:25 +0000464 else if (const CXXDestructorDecl *DD = dyn_cast<CXXDestructorDecl>(D))
Rafael Espindolac4850c22011-02-10 23:59:36 +0000465 MangleCtx.mangleDtorBlock(DD, GD.getDtorType(), BD, Out);
Peter Collingbourne14110472011-01-13 18:57:25 +0000466 else
Rafael Espindolac4850c22011-02-10 23:59:36 +0000467 MangleCtx.mangleBlock(cast<DeclContext>(D), BD, Out);
Anders Carlsson9a8822b2010-06-09 02:36:32 +0000468}
469
Chris Lattner5f9e2722011-07-23 10:55:15 +0000470llvm::GlobalValue *CodeGenModule::GetGlobalValue(StringRef Name) {
John McCallf746aa62010-03-19 23:29:14 +0000471 return getModule().getNamedValue(Name);
Douglas Gregor5f2bfd42009-02-13 00:10:09 +0000472}
473
Chris Lattner6d397602008-03-14 17:18:18 +0000474/// AddGlobalCtor - Add a function to the list that will be called before
475/// main() runs.
Daniel Dunbar6bfed7e2008-08-01 00:01:51 +0000476void CodeGenModule::AddGlobalCtor(llvm::Function * Ctor, int Priority) {
Daniel Dunbar49988882009-01-13 02:25:00 +0000477 // FIXME: Type coercion of void()* types.
Daniel Dunbar6bfed7e2008-08-01 00:01:51 +0000478 GlobalCtors.push_back(std::make_pair(Ctor, Priority));
Chris Lattner6d397602008-03-14 17:18:18 +0000479}
480
Daniel Dunbar6bfed7e2008-08-01 00:01:51 +0000481/// AddGlobalDtor - Add a function to the list that will be called
482/// when the module is unloaded.
483void CodeGenModule::AddGlobalDtor(llvm::Function * Dtor, int Priority) {
Daniel Dunbar49988882009-01-13 02:25:00 +0000484 // FIXME: Type coercion of void()* types.
Daniel Dunbar6bfed7e2008-08-01 00:01:51 +0000485 GlobalDtors.push_back(std::make_pair(Dtor, Priority));
486}
487
488void CodeGenModule::EmitCtorList(const CtorList &Fns, const char *GlobalName) {
489 // Ctor function type is void()*.
John McCall0774cb82011-05-15 01:53:33 +0000490 llvm::FunctionType* CtorFTy = llvm::FunctionType::get(VoidTy, false);
Owen Anderson96e0fc72009-07-29 22:16:19 +0000491 llvm::Type *CtorPFTy = llvm::PointerType::getUnqual(CtorFTy);
Daniel Dunbar6bfed7e2008-08-01 00:01:51 +0000492
493 // Get the type of a ctor entry, { i32, void ()* }.
Chris Lattnerc5cbb902011-06-20 04:01:35 +0000494 llvm::StructType *CtorStructTy =
Chris Lattner8b418682012-02-07 00:39:47 +0000495 llvm::StructType::get(Int32Ty, llvm::PointerType::getUnqual(CtorFTy), NULL);
Chris Lattner6d397602008-03-14 17:18:18 +0000496
Daniel Dunbar6bfed7e2008-08-01 00:01:51 +0000497 // Construct the constructor and destructor arrays.
Chris Lattner0b239712012-02-06 22:16:34 +0000498 SmallVector<llvm::Constant*, 8> Ctors;
Daniel Dunbar6bfed7e2008-08-01 00:01:51 +0000499 for (CtorList::const_iterator I = Fns.begin(), E = Fns.end(); I != E; ++I) {
Chris Lattner0b239712012-02-06 22:16:34 +0000500 llvm::Constant *S[] = {
501 llvm::ConstantInt::get(Int32Ty, I->second, false),
502 llvm::ConstantExpr::getBitCast(I->first, CtorPFTy)
503 };
Owen Anderson08e25242009-07-27 22:29:56 +0000504 Ctors.push_back(llvm::ConstantStruct::get(CtorStructTy, S));
Chris Lattner6d397602008-03-14 17:18:18 +0000505 }
Daniel Dunbar6bfed7e2008-08-01 00:01:51 +0000506
507 if (!Ctors.empty()) {
Owen Anderson96e0fc72009-07-29 22:16:19 +0000508 llvm::ArrayType *AT = llvm::ArrayType::get(CtorStructTy, Ctors.size());
Owen Anderson1c431b32009-07-08 19:05:04 +0000509 new llvm::GlobalVariable(TheModule, AT, false,
Daniel Dunbar6bfed7e2008-08-01 00:01:51 +0000510 llvm::GlobalValue::AppendingLinkage,
Owen Anderson7db6d832009-07-28 18:33:04 +0000511 llvm::ConstantArray::get(AT, Ctors),
Owen Anderson1c431b32009-07-08 19:05:04 +0000512 GlobalName);
Daniel Dunbar6bfed7e2008-08-01 00:01:51 +0000513 }
Chris Lattner6d397602008-03-14 17:18:18 +0000514}
515
John McCalld46f9852010-02-19 01:32:20 +0000516llvm::GlobalValue::LinkageTypes
Peter Collingbourne144a31f2013-06-05 17:49:37 +0000517CodeGenModule::getFunctionLinkage(GlobalDecl GD) {
Eli Friedman7a36a592013-07-01 20:53:07 +0000518 const FunctionDecl *D = cast<FunctionDecl>(GD.getDecl());
Argyrios Kyrtzidis90e99a82010-07-29 18:15:58 +0000519 GVALinkage Linkage = getContext().GetGVALinkageForFunction(D);
Daniel Dunbar7c65e992009-04-14 08:05:55 +0000520
Chris Lattnerf81530652010-06-30 16:58:07 +0000521 if (Linkage == GVA_Internal)
John McCalld46f9852010-02-19 01:32:20 +0000522 return llvm::Function::InternalLinkage;
Chris Lattnerf81530652010-06-30 16:58:07 +0000523
524 if (D->hasAttr<DLLExportAttr>())
John McCalld46f9852010-02-19 01:32:20 +0000525 return llvm::Function::DLLExportLinkage;
Chris Lattnerf81530652010-06-30 16:58:07 +0000526
527 if (D->hasAttr<WeakAttr>())
John McCalld46f9852010-02-19 01:32:20 +0000528 return llvm::Function::WeakAnyLinkage;
Chris Lattnerf81530652010-06-30 16:58:07 +0000529
530 // In C99 mode, 'inline' functions are guaranteed to have a strong
531 // definition somewhere else, so we can use available_externally linkage.
532 if (Linkage == GVA_C99Inline)
Fariborz Jahanianfd0f89d2011-02-04 00:08:13 +0000533 return llvm::Function::AvailableExternallyLinkage;
John McCall5584d912011-09-19 18:05:26 +0000534
535 // Note that Apple's kernel linker doesn't support symbol
536 // coalescing, so we need to avoid linkonce and weak linkages there.
537 // Normally, this means we just map to internal, but for explicit
538 // instantiations we'll map to external.
539
Chris Lattnerf81530652010-06-30 16:58:07 +0000540 // In C++, the compiler has to emit a definition in every translation unit
541 // that references the function. We should use linkonce_odr because
542 // a) if all references in this translation unit are optimized away, we
543 // don't need to codegen it. b) if the function persists, it needs to be
544 // merged with other definitions. c) C++ has the ODR, so we know the
545 // definition is dependable.
546 if (Linkage == GVA_CXXInline || Linkage == GVA_TemplateInstantiation)
David Blaikie4e4d0842012-03-11 07:00:24 +0000547 return !Context.getLangOpts().AppleKext
Fariborz Jahanian142f9e92011-02-04 00:01:24 +0000548 ? llvm::Function::LinkOnceODRLinkage
549 : llvm::Function::InternalLinkage;
Chris Lattnerf81530652010-06-30 16:58:07 +0000550
551 // An explicit instantiation of a template has weak linkage, since
552 // explicit instantiations can occur in multiple translation units
553 // and must all be equivalent. However, we are not allowed to
554 // throw away these explicit instantiations.
555 if (Linkage == GVA_ExplicitTemplateInstantiation)
David Blaikie4e4d0842012-03-11 07:00:24 +0000556 return !Context.getLangOpts().AppleKext
Fariborz Jahanian142f9e92011-02-04 00:01:24 +0000557 ? llvm::Function::WeakODRLinkage
John McCall5584d912011-09-19 18:05:26 +0000558 : llvm::Function::ExternalLinkage;
Chris Lattnerf81530652010-06-30 16:58:07 +0000559
560 // Otherwise, we have strong external linkage.
561 assert(Linkage == GVA_StrongExternal);
562 return llvm::Function::ExternalLinkage;
John McCalld46f9852010-02-19 01:32:20 +0000563}
Nuno Lopesd4cbda62008-06-08 15:45:52 +0000564
John McCalld46f9852010-02-19 01:32:20 +0000565
566/// SetFunctionDefinitionAttributes - Set attributes for a global.
567///
568/// FIXME: This is currently only done for aliases and functions, but not for
569/// variables (these details are set in EmitGlobalVarDefinition for variables).
570void CodeGenModule::SetFunctionDefinitionAttributes(const FunctionDecl *D,
571 llvm::GlobalValue *GV) {
Daniel Dunbar7c65e992009-04-14 08:05:55 +0000572 SetCommonAttributes(D, GV);
Nuno Lopesd4cbda62008-06-08 15:45:52 +0000573}
574
Daniel Dunbar7dbd8192009-04-14 07:08:30 +0000575void CodeGenModule::SetLLVMFunctionAttributes(const Decl *D,
Mike Stump1eb44332009-09-09 15:08:12 +0000576 const CGFunctionInfo &Info,
Daniel Dunbar7dbd8192009-04-14 07:08:30 +0000577 llvm::Function *F) {
Daniel Dunbarca6408c2009-09-12 00:59:20 +0000578 unsigned CallingConv;
Devang Patel761d7f72008-09-25 21:02:23 +0000579 AttributeListType AttributeList;
Bill Wendling94236e72013-02-22 00:13:35 +0000580 ConstructAttributeList(Info, D, AttributeList, CallingConv, false);
Bill Wendling785b7782012-12-07 23:17:26 +0000581 F->setAttributes(llvm::AttributeSet::get(getLLVMContext(), AttributeList));
Daniel Dunbarca6408c2009-09-12 00:59:20 +0000582 F->setCallingConv(static_cast<llvm::CallingConv::ID>(CallingConv));
Daniel Dunbarf80519b2008-09-04 23:41:35 +0000583}
584
John McCalld1e40d52011-10-02 01:16:38 +0000585/// Determines whether the language options require us to model
586/// unwind exceptions. We treat -fexceptions as mandating this
587/// except under the fragile ObjC ABI with only ObjC exceptions
588/// enabled. This means, for example, that C with -fexceptions
589/// enables this.
David Blaikie4e4d0842012-03-11 07:00:24 +0000590static bool hasUnwindExceptions(const LangOptions &LangOpts) {
John McCalld1e40d52011-10-02 01:16:38 +0000591 // If exceptions are completely disabled, obviously this is false.
David Blaikie4e4d0842012-03-11 07:00:24 +0000592 if (!LangOpts.Exceptions) return false;
John McCalld1e40d52011-10-02 01:16:38 +0000593
594 // If C++ exceptions are enabled, this is true.
David Blaikie4e4d0842012-03-11 07:00:24 +0000595 if (LangOpts.CXXExceptions) return true;
John McCalld1e40d52011-10-02 01:16:38 +0000596
597 // If ObjC exceptions are enabled, this depends on the ABI.
David Blaikie4e4d0842012-03-11 07:00:24 +0000598 if (LangOpts.ObjCExceptions) {
David Chisnall11d3f4c2012-07-03 20:49:52 +0000599 return LangOpts.ObjCRuntime.hasUnwindExceptions();
John McCalld1e40d52011-10-02 01:16:38 +0000600 }
601
602 return true;
603}
604
Daniel Dunbar7c65e992009-04-14 08:05:55 +0000605void CodeGenModule::SetLLVMFunctionAttributesForDefinition(const Decl *D,
606 llvm::Function *F) {
Benjamin Kramer06a9d042013-05-11 12:45:37 +0000607 llvm::AttrBuilder B;
608
Rafael Espindolaabca5a12011-05-25 03:44:55 +0000609 if (CodeGenOpts.UnwindTables)
Benjamin Kramer06a9d042013-05-11 12:45:37 +0000610 B.addAttribute(llvm::Attribute::UWTable);
Rafael Espindolaabca5a12011-05-25 03:44:55 +0000611
David Blaikie4e4d0842012-03-11 07:00:24 +0000612 if (!hasUnwindExceptions(LangOpts))
Benjamin Kramer06a9d042013-05-11 12:45:37 +0000613 B.addAttribute(llvm::Attribute::NoUnwind);
Daniel Dunbaraf668b02008-10-28 00:17:57 +0000614
Eli Friedman2873aee2011-08-22 23:55:33 +0000615 if (D->hasAttr<NakedAttr>()) {
616 // Naked implies noinline: we should not be inlining such functions.
Benjamin Kramer06a9d042013-05-11 12:45:37 +0000617 B.addAttribute(llvm::Attribute::Naked);
618 B.addAttribute(llvm::Attribute::NoInline);
619 } else if (D->hasAttr<NoInlineAttr>()) {
620 B.addAttribute(llvm::Attribute::NoInline);
621 } else if ((D->hasAttr<AlwaysInlineAttr>() ||
622 D->hasAttr<ForceInlineAttr>()) &&
623 !F->getAttributes().hasAttribute(llvm::AttributeSet::FunctionIndex,
624 llvm::Attribute::NoInline)) {
625 // (noinline wins over always_inline, and we can't specify both in IR)
626 B.addAttribute(llvm::Attribute::AlwaysInline);
Eli Friedman2873aee2011-08-22 23:55:33 +0000627 }
Daniel Dunbardd0cb222010-09-29 18:20:25 +0000628
Diego Novillod27e5cb2013-05-24 20:18:15 +0000629 if (D->hasAttr<ColdAttr>()) {
Benjamin Kramer06a9d042013-05-11 12:45:37 +0000630 B.addAttribute(llvm::Attribute::OptimizeForSize);
Diego Novillod27e5cb2013-05-24 20:18:15 +0000631 B.addAttribute(llvm::Attribute::Cold);
632 }
Benjamin Krameree409a92012-05-12 21:10:52 +0000633
Quentin Colombetaee56fa2012-11-01 23:55:47 +0000634 if (D->hasAttr<MinSizeAttr>())
Benjamin Kramer06a9d042013-05-11 12:45:37 +0000635 B.addAttribute(llvm::Attribute::MinSize);
Richard Smithef4d5ce2012-09-28 22:46:07 +0000636
David Blaikie4e4d0842012-03-11 07:00:24 +0000637 if (LangOpts.getStackProtector() == LangOptions::SSPOn)
Benjamin Kramer06a9d042013-05-11 12:45:37 +0000638 B.addAttribute(llvm::Attribute::StackProtect);
David Blaikie4e4d0842012-03-11 07:00:24 +0000639 else if (LangOpts.getStackProtector() == LangOptions::SSPReq)
Benjamin Kramer06a9d042013-05-11 12:45:37 +0000640 B.addAttribute(llvm::Attribute::StackProtectReq);
Will Dietz4f45bc02013-01-18 11:30:38 +0000641
Alexey Samsonov7e73f942013-03-06 10:54:18 +0000642 // Add sanitizer attributes if function is not blacklisted.
643 if (!SanitizerBlacklist.isIn(*F)) {
644 // When AddressSanitizer is enabled, set SanitizeAddress attribute
645 // unless __attribute__((no_sanitize_address)) is used.
646 if (SanOpts.Address && !D->hasAttr<NoSanitizeAddressAttr>())
Benjamin Kramer06a9d042013-05-11 12:45:37 +0000647 B.addAttribute(llvm::Attribute::SanitizeAddress);
Alexey Samsonov7e73f942013-03-06 10:54:18 +0000648 // Same for ThreadSanitizer and __attribute__((no_sanitize_thread))
649 if (SanOpts.Thread && !D->hasAttr<NoSanitizeThreadAttr>()) {
Benjamin Kramer06a9d042013-05-11 12:45:37 +0000650 B.addAttribute(llvm::Attribute::SanitizeThread);
Alexey Samsonov7e73f942013-03-06 10:54:18 +0000651 }
652 // Same for MemorySanitizer and __attribute__((no_sanitize_memory))
653 if (SanOpts.Memory && !D->hasAttr<NoSanitizeMemoryAttr>())
Benjamin Kramer06a9d042013-05-11 12:45:37 +0000654 B.addAttribute(llvm::Attribute::SanitizeMemory);
Alexey Samsonov7e73f942013-03-06 10:54:18 +0000655 }
Alexander Potapenko89651ea2012-02-02 11:49:28 +0000656
Benjamin Kramer06a9d042013-05-11 12:45:37 +0000657 F->addAttributes(llvm::AttributeSet::FunctionIndex,
658 llvm::AttributeSet::get(
659 F->getContext(), llvm::AttributeSet::FunctionIndex, B));
660
661 if (isa<CXXConstructorDecl>(D) || isa<CXXDestructorDecl>(D))
662 F->setUnnamedAddr(true);
663 else if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D))
664 if (MD->isVirtual())
665 F->setUnnamedAddr(true);
666
Sean Huntcf807c42010-08-18 23:23:40 +0000667 unsigned alignment = D->getMaxAlignment() / Context.getCharWidth();
668 if (alignment)
669 F->setAlignment(alignment);
670
Mike Stumpfb51ddf2009-10-05 22:49:20 +0000671 // C++ ABI requires 2-byte alignment for member functions.
Mike Stumpbd6dbd12009-10-05 23:08:21 +0000672 if (F->getAlignment() < 2 && isa<CXXMethodDecl>(D))
673 F->setAlignment(2);
Daniel Dunbarf80519b2008-09-04 23:41:35 +0000674}
675
Mike Stump1eb44332009-09-09 15:08:12 +0000676void CodeGenModule::SetCommonAttributes(const Decl *D,
Daniel Dunbar7c65e992009-04-14 08:05:55 +0000677 llvm::GlobalValue *GV) {
Anders Carlsson934176f2011-01-29 19:41:00 +0000678 if (const NamedDecl *ND = dyn_cast<NamedDecl>(D))
679 setGlobalVisibility(GV, ND);
John McCall1fb0caa2010-10-22 21:05:15 +0000680 else
681 GV->setVisibility(llvm::GlobalValue::DefaultVisibility);
Daniel Dunbar7c65e992009-04-14 08:05:55 +0000682
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +0000683 if (D->hasAttr<UsedAttr>())
Daniel Dunbar7c65e992009-04-14 08:05:55 +0000684 AddUsedGlobal(GV);
685
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +0000686 if (const SectionAttr *SA = D->getAttr<SectionAttr>())
Daniel Dunbar7c65e992009-04-14 08:05:55 +0000687 GV->setSection(SA->getName());
Anton Korobeynikov82d0a412010-01-10 12:58:08 +0000688
Rafael Espindola9a2f5d72013-03-19 15:03:47 +0000689 // Alias cannot have attributes. Filter them here.
690 if (!isa<llvm::GlobalAlias>(GV))
691 getTargetCodeGenInfo().SetTargetAttributes(D, GV, *this);
Daniel Dunbar7c65e992009-04-14 08:05:55 +0000692}
693
Daniel Dunbar0e4f40e2009-04-17 00:48:04 +0000694void CodeGenModule::SetInternalFunctionAttributes(const Decl *D,
695 llvm::Function *F,
696 const CGFunctionInfo &FI) {
697 SetLLVMFunctionAttributes(D, FI, F);
698 SetLLVMFunctionAttributesForDefinition(D, F);
Daniel Dunbar7c65e992009-04-14 08:05:55 +0000699
700 F->setLinkage(llvm::Function::InternalLinkage);
701
Daniel Dunbar0e4f40e2009-04-17 00:48:04 +0000702 SetCommonAttributes(D, F);
Daniel Dunbarf80519b2008-09-04 23:41:35 +0000703}
704
Anders Carlssonb2bcf1c2010-02-06 02:44:09 +0000705void CodeGenModule::SetFunctionAttributes(GlobalDecl GD,
Eli Friedmanc6c14d12009-05-26 01:22:57 +0000706 llvm::Function *F,
707 bool IsIncompleteFunction) {
Peter Collingbourne0ac2cf42011-04-06 12:29:04 +0000708 if (unsigned IID = F->getIntrinsicID()) {
709 // If this is an intrinsic function, set the function's attributes
710 // to the intrinsic's attributes.
Bill Wendling50e6b182012-10-15 04:47:45 +0000711 F->setAttributes(llvm::Intrinsic::getAttributes(getLLVMContext(),
712 (llvm::Intrinsic::ID)IID));
Peter Collingbourne0ac2cf42011-04-06 12:29:04 +0000713 return;
714 }
715
Anders Carlssonb2bcf1c2010-02-06 02:44:09 +0000716 const FunctionDecl *FD = cast<FunctionDecl>(GD.getDecl());
717
Eli Friedmanc6c14d12009-05-26 01:22:57 +0000718 if (!IsIncompleteFunction)
John McCallde5d3c72012-02-17 03:33:10 +0000719 SetLLVMFunctionAttributes(FD, getTypes().arrangeGlobalDeclaration(GD), F);
Mike Stump1eb44332009-09-09 15:08:12 +0000720
Stephen Lin3b50e8d2013-06-30 20:40:16 +0000721 if (getCXXABI().HasThisReturn(GD)) {
722 assert(!F->arg_empty() &&
723 F->arg_begin()->getType()
724 ->canLosslesslyBitCastTo(F->getReturnType()) &&
725 "unexpected this return");
726 F->addAttribute(1, llvm::Attribute::Returned);
727 }
728
Daniel Dunbar7c65e992009-04-14 08:05:55 +0000729 // Only a few attributes are set on declarations; these may later be
730 // overridden by a definition.
Mike Stump1eb44332009-09-09 15:08:12 +0000731
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +0000732 if (FD->hasAttr<DLLImportAttr>()) {
Daniel Dunbar7c65e992009-04-14 08:05:55 +0000733 F->setLinkage(llvm::Function::DLLImportLinkage);
Mike Stump1eb44332009-09-09 15:08:12 +0000734 } else if (FD->hasAttr<WeakAttr>() ||
Douglas Gregor0a0d2b12011-03-23 00:50:03 +0000735 FD->isWeakImported()) {
Daniel Dunbar7c65e992009-04-14 08:05:55 +0000736 // "extern_weak" is overloaded in LLVM; we probably should have
Mike Stump1eb44332009-09-09 15:08:12 +0000737 // separate linkage types for this.
Daniel Dunbar7c65e992009-04-14 08:05:55 +0000738 F->setLinkage(llvm::Function::ExternalWeakLinkage);
739 } else {
Mike Stump1eb44332009-09-09 15:08:12 +0000740 F->setLinkage(llvm::Function::ExternalLinkage);
John McCallaf146032010-10-30 11:50:40 +0000741
Rafael Espindola2beda122013-02-27 02:15:29 +0000742 LinkageInfo LV = FD->getLinkageAndVisibility();
Rafael Espindolaf127eb82013-02-27 02:56:45 +0000743 if (LV.getLinkage() == ExternalLinkage && LV.isVisibilityExplicit()) {
744 F->setVisibility(GetLLVMVisibility(LV.getVisibility()));
John McCallaf146032010-10-30 11:50:40 +0000745 }
Daniel Dunbar7c65e992009-04-14 08:05:55 +0000746 }
747
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +0000748 if (const SectionAttr *SA = FD->getAttr<SectionAttr>())
Daniel Dunbar7c65e992009-04-14 08:05:55 +0000749 F->setSection(SA->getName());
Daniel Dunbar219df662008-09-08 23:44:31 +0000750}
751
Daniel Dunbar02698712009-02-13 20:29:50 +0000752void CodeGenModule::AddUsedGlobal(llvm::GlobalValue *GV) {
Mike Stump1eb44332009-09-09 15:08:12 +0000753 assert(!GV->isDeclaration() &&
Daniel Dunbar02698712009-02-13 20:29:50 +0000754 "Only globals with definition can force usage.");
Chris Lattner35f38a22009-03-31 22:37:52 +0000755 LLVMUsed.push_back(GV);
Daniel Dunbar02698712009-02-13 20:29:50 +0000756}
757
758void CodeGenModule::EmitLLVMUsed() {
759 // Don't create llvm.used if there is no need.
Chris Lattnerad64e022009-07-17 23:57:13 +0000760 if (LLVMUsed.empty())
Daniel Dunbar02698712009-02-13 20:29:50 +0000761 return;
762
Chris Lattner35f38a22009-03-31 22:37:52 +0000763 // Convert LLVMUsed to what ConstantArray needs.
Chris Lattner0b239712012-02-06 22:16:34 +0000764 SmallVector<llvm::Constant*, 8> UsedArray;
Chris Lattner35f38a22009-03-31 22:37:52 +0000765 UsedArray.resize(LLVMUsed.size());
766 for (unsigned i = 0, e = LLVMUsed.size(); i != e; ++i) {
Mike Stump1eb44332009-09-09 15:08:12 +0000767 UsedArray[i] =
768 llvm::ConstantExpr::getBitCast(cast<llvm::Constant>(&*LLVMUsed[i]),
Chris Lattner0b239712012-02-06 22:16:34 +0000769 Int8PtrTy);
Chris Lattner35f38a22009-03-31 22:37:52 +0000770 }
Mike Stump1eb44332009-09-09 15:08:12 +0000771
Fariborz Jahanianc38e9af2009-06-23 21:47:46 +0000772 if (UsedArray.empty())
773 return;
Chris Lattner0b239712012-02-06 22:16:34 +0000774 llvm::ArrayType *ATy = llvm::ArrayType::get(Int8PtrTy, UsedArray.size());
Mike Stump1eb44332009-09-09 15:08:12 +0000775
776 llvm::GlobalVariable *GV =
777 new llvm::GlobalVariable(getModule(), ATy, false,
Daniel Dunbar02698712009-02-13 20:29:50 +0000778 llvm::GlobalValue::AppendingLinkage,
Owen Anderson7db6d832009-07-28 18:33:04 +0000779 llvm::ConstantArray::get(ATy, UsedArray),
Owen Anderson1c431b32009-07-08 19:05:04 +0000780 "llvm.used");
Daniel Dunbar02698712009-02-13 20:29:50 +0000781
782 GV->setSection("llvm.metadata");
783}
784
Reid Kleckner3190ca92013-05-08 13:44:39 +0000785void CodeGenModule::AppendLinkerOptions(StringRef Opts) {
786 llvm::Value *MDOpts = llvm::MDString::get(getLLVMContext(), Opts);
787 LinkerOptionsMetadata.push_back(llvm::MDNode::get(getLLVMContext(), MDOpts));
788}
789
Aaron Ballmana7ff62f2013-06-04 02:07:14 +0000790void CodeGenModule::AddDetectMismatch(StringRef Name, StringRef Value) {
791 llvm::SmallString<32> Opt;
792 getTargetCodeGenInfo().getDetectMismatchOption(Name, Value, Opt);
793 llvm::Value *MDOpts = llvm::MDString::get(getLLVMContext(), Opt);
794 LinkerOptionsMetadata.push_back(llvm::MDNode::get(getLLVMContext(), MDOpts));
795}
796
Reid Kleckner3190ca92013-05-08 13:44:39 +0000797void CodeGenModule::AddDependentLib(StringRef Lib) {
798 llvm::SmallString<24> Opt;
799 getTargetCodeGenInfo().getDependentLibraryOption(Lib, Opt);
800 llvm::Value *MDOpts = llvm::MDString::get(getLLVMContext(), Opt);
801 LinkerOptionsMetadata.push_back(llvm::MDNode::get(getLLVMContext(), MDOpts));
802}
803
Douglas Gregor858afb32013-01-14 20:53:57 +0000804/// \brief Add link options implied by the given module, including modules
805/// it depends on, using a postorder walk.
Reid Kleckner3190ca92013-05-08 13:44:39 +0000806static void addLinkOptionsPostorder(CodeGenModule &CGM,
Douglas Gregor858afb32013-01-14 20:53:57 +0000807 Module *Mod,
Daniel Dunbarf9d03c12013-01-17 01:35:06 +0000808 SmallVectorImpl<llvm::Value *> &Metadata,
Douglas Gregor858afb32013-01-14 20:53:57 +0000809 llvm::SmallPtrSet<Module *, 16> &Visited) {
810 // Import this module's parent.
811 if (Mod->Parent && Visited.insert(Mod->Parent)) {
Reid Kleckner3190ca92013-05-08 13:44:39 +0000812 addLinkOptionsPostorder(CGM, Mod->Parent, Metadata, Visited);
Douglas Gregor858afb32013-01-14 20:53:57 +0000813 }
814
815 // Import this module's dependencies.
816 for (unsigned I = Mod->Imports.size(); I > 0; --I) {
817 if (Visited.insert(Mod->Imports[I-1]))
Reid Kleckner3190ca92013-05-08 13:44:39 +0000818 addLinkOptionsPostorder(CGM, Mod->Imports[I-1], Metadata, Visited);
Douglas Gregor858afb32013-01-14 20:53:57 +0000819 }
820
821 // Add linker options to link against the libraries/frameworks
822 // described by this module.
Reid Kleckner3190ca92013-05-08 13:44:39 +0000823 llvm::LLVMContext &Context = CGM.getLLVMContext();
Douglas Gregor858afb32013-01-14 20:53:57 +0000824 for (unsigned I = Mod->LinkLibraries.size(); I > 0; --I) {
Reid Kleckner3190ca92013-05-08 13:44:39 +0000825 // Link against a framework. Frameworks are currently Darwin only, so we
826 // don't to ask TargetCodeGenInfo for the spelling of the linker option.
Douglas Gregor858afb32013-01-14 20:53:57 +0000827 if (Mod->LinkLibraries[I-1].IsFramework) {
828 llvm::Value *Args[2] = {
829 llvm::MDString::get(Context, "-framework"),
830 llvm::MDString::get(Context, Mod->LinkLibraries[I-1].Library)
831 };
832
833 Metadata.push_back(llvm::MDNode::get(Context, Args));
834 continue;
835 }
836
837 // Link against a library.
Reid Kleckner3190ca92013-05-08 13:44:39 +0000838 llvm::SmallString<24> Opt;
839 CGM.getTargetCodeGenInfo().getDependentLibraryOption(
840 Mod->LinkLibraries[I-1].Library, Opt);
841 llvm::Value *OptString = llvm::MDString::get(Context, Opt);
Douglas Gregor858afb32013-01-14 20:53:57 +0000842 Metadata.push_back(llvm::MDNode::get(Context, OptString));
843 }
844}
845
846void CodeGenModule::EmitModuleLinkOptions() {
847 // Collect the set of all of the modules we want to visit to emit link
848 // options, which is essentially the imported modules and all of their
849 // non-explicit child modules.
850 llvm::SetVector<clang::Module *> LinkModules;
851 llvm::SmallPtrSet<clang::Module *, 16> Visited;
852 SmallVector<clang::Module *, 16> Stack;
853
854 // Seed the stack with imported modules.
855 for (llvm::SetVector<clang::Module *>::iterator M = ImportedModules.begin(),
856 MEnd = ImportedModules.end();
857 M != MEnd; ++M) {
858 if (Visited.insert(*M))
859 Stack.push_back(*M);
860 }
861
862 // Find all of the modules to import, making a little effort to prune
863 // non-leaf modules.
864 while (!Stack.empty()) {
865 clang::Module *Mod = Stack.back();
866 Stack.pop_back();
867
868 bool AnyChildren = false;
869
870 // Visit the submodules of this module.
871 for (clang::Module::submodule_iterator Sub = Mod->submodule_begin(),
872 SubEnd = Mod->submodule_end();
873 Sub != SubEnd; ++Sub) {
874 // Skip explicit children; they need to be explicitly imported to be
875 // linked against.
876 if ((*Sub)->IsExplicit)
877 continue;
878
879 if (Visited.insert(*Sub)) {
880 Stack.push_back(*Sub);
881 AnyChildren = true;
882 }
883 }
884
885 // We didn't find any children, so add this module to the list of
886 // modules to link against.
887 if (!AnyChildren) {
888 LinkModules.insert(Mod);
889 }
890 }
891
892 // Add link options for all of the imported modules in reverse topological
Reid Kleckner3190ca92013-05-08 13:44:39 +0000893 // order. We don't do anything to try to order import link flags with respect
894 // to linker options inserted by things like #pragma comment().
Daniel Dunbarf9d03c12013-01-17 01:35:06 +0000895 SmallVector<llvm::Value *, 16> MetadataArgs;
Douglas Gregor858afb32013-01-14 20:53:57 +0000896 Visited.clear();
897 for (llvm::SetVector<clang::Module *>::iterator M = LinkModules.begin(),
898 MEnd = LinkModules.end();
899 M != MEnd; ++M) {
900 if (Visited.insert(*M))
Reid Kleckner3190ca92013-05-08 13:44:39 +0000901 addLinkOptionsPostorder(*this, *M, MetadataArgs, Visited);
Douglas Gregor858afb32013-01-14 20:53:57 +0000902 }
Daniel Dunbarf9d03c12013-01-17 01:35:06 +0000903 std::reverse(MetadataArgs.begin(), MetadataArgs.end());
Reid Kleckner3190ca92013-05-08 13:44:39 +0000904 LinkerOptionsMetadata.append(MetadataArgs.begin(), MetadataArgs.end());
Douglas Gregor858afb32013-01-14 20:53:57 +0000905
Daniel Dunbarf9d03c12013-01-17 01:35:06 +0000906 // Add the linker options metadata flag.
907 getModule().addModuleFlag(llvm::Module::AppendUnique, "Linker Options",
Reid Kleckner3190ca92013-05-08 13:44:39 +0000908 llvm::MDNode::get(getLLVMContext(),
909 LinkerOptionsMetadata));
Douglas Gregor858afb32013-01-14 20:53:57 +0000910}
911
Daniel Dunbar02698712009-02-13 20:29:50 +0000912void CodeGenModule::EmitDeferred() {
Chris Lattner67b00522009-03-21 09:44:56 +0000913 // Emit code for any potentially referenced deferred decls. Since a
914 // previously unused static decl may become used during the generation of code
Nick Lewyckydce67a72011-07-18 05:26:13 +0000915 // for a static function, iterate until no changes are made.
Rafael Espindolabbf58bb2010-03-10 02:19:29 +0000916
John McCalld5617ee2013-01-25 22:31:03 +0000917 while (true) {
Anders Carlsson046c2942010-04-17 20:15:18 +0000918 if (!DeferredVTables.empty()) {
John McCalld5617ee2013-01-25 22:31:03 +0000919 EmitDeferredVTables();
920
921 // Emitting a v-table doesn't directly cause more v-tables to
922 // become deferred, although it can cause functions to be
923 // emitted that then need those v-tables.
924 assert(DeferredVTables.empty());
Rafael Espindolabbf58bb2010-03-10 02:19:29 +0000925 }
926
John McCalld5617ee2013-01-25 22:31:03 +0000927 // Stop if we're out of both deferred v-tables and deferred declarations.
928 if (DeferredDeclsToEmit.empty()) break;
929
Anders Carlsson2a131fb2009-05-05 04:44:02 +0000930 GlobalDecl D = DeferredDeclsToEmit.back();
Chris Lattner67b00522009-03-21 09:44:56 +0000931 DeferredDeclsToEmit.pop_back();
932
John McCallc76702c2010-05-27 01:45:30 +0000933 // Check to see if we've already emitted this. This is necessary
934 // for a couple of reasons: first, decls can end up in the
935 // deferred-decls queue multiple times, and second, decls can end
936 // up with definitions in unusual ways (e.g. by an extern inline
937 // function acquiring a strong function redefinition). Just
938 // ignore these cases.
939 //
940 // TODO: That said, looking this up multiple times is very wasteful.
Chris Lattner5f9e2722011-07-23 10:55:15 +0000941 StringRef Name = getMangledName(D);
John McCallf746aa62010-03-19 23:29:14 +0000942 llvm::GlobalValue *CGRef = GetGlobalValue(Name);
Chris Lattner67b00522009-03-21 09:44:56 +0000943 assert(CGRef && "Deferred decl wasn't referenced?");
Mike Stump1eb44332009-09-09 15:08:12 +0000944
Chris Lattner67b00522009-03-21 09:44:56 +0000945 if (!CGRef->isDeclaration())
946 continue;
Mike Stump1eb44332009-09-09 15:08:12 +0000947
John McCallc76702c2010-05-27 01:45:30 +0000948 // GlobalAlias::isDeclaration() defers to the aliasee, but for our
949 // purposes an alias counts as a definition.
950 if (isa<llvm::GlobalAlias>(CGRef))
951 continue;
952
Chris Lattner67b00522009-03-21 09:44:56 +0000953 // Otherwise, emit the definition and move on to the next one.
954 EmitGlobalDefinition(D);
955 }
Reid Spencer5f016e22007-07-11 17:01:13 +0000956}
957
Julien Lerouge77f68bb2011-09-09 22:41:49 +0000958void CodeGenModule::EmitGlobalAnnotations() {
959 if (Annotations.empty())
960 return;
961
962 // Create a new global variable for the ConstantStruct in the Module.
963 llvm::Constant *Array = llvm::ConstantArray::get(llvm::ArrayType::get(
964 Annotations[0]->getType(), Annotations.size()), Annotations);
965 llvm::GlobalValue *gv = new llvm::GlobalVariable(getModule(),
966 Array->getType(), false, llvm::GlobalValue::AppendingLinkage, Array,
967 "llvm.global.annotations");
968 gv->setSection(AnnotationSection);
969}
970
Dmitri Gribenkocfa88f82013-01-12 19:30:44 +0000971llvm::Constant *CodeGenModule::EmitAnnotationString(StringRef Str) {
Julien Lerouge77f68bb2011-09-09 22:41:49 +0000972 llvm::StringMap<llvm::Constant*>::iterator i = AnnotationStrings.find(Str);
973 if (i != AnnotationStrings.end())
974 return i->second;
975
976 // Not found yet, create a new global.
Chris Lattner94010692012-02-05 02:30:40 +0000977 llvm::Constant *s = llvm::ConstantDataArray::getString(getLLVMContext(), Str);
Julien Lerouge77f68bb2011-09-09 22:41:49 +0000978 llvm::GlobalValue *gv = new llvm::GlobalVariable(getModule(), s->getType(),
979 true, llvm::GlobalValue::PrivateLinkage, s, ".str");
980 gv->setSection(AnnotationSection);
981 gv->setUnnamedAddr(true);
982 AnnotationStrings[Str] = gv;
983 return gv;
984}
985
986llvm::Constant *CodeGenModule::EmitAnnotationUnit(SourceLocation Loc) {
987 SourceManager &SM = getContext().getSourceManager();
988 PresumedLoc PLoc = SM.getPresumedLoc(Loc);
989 if (PLoc.isValid())
990 return EmitAnnotationString(PLoc.getFilename());
991 return EmitAnnotationString(SM.getBufferName(Loc));
992}
993
994llvm::Constant *CodeGenModule::EmitAnnotationLineNo(SourceLocation L) {
995 SourceManager &SM = getContext().getSourceManager();
996 PresumedLoc PLoc = SM.getPresumedLoc(L);
997 unsigned LineNo = PLoc.isValid() ? PLoc.getLine() :
998 SM.getExpansionLineNumber(L);
999 return llvm::ConstantInt::get(Int32Ty, LineNo);
1000}
1001
Mike Stump1eb44332009-09-09 15:08:12 +00001002llvm::Constant *CodeGenModule::EmitAnnotateAttr(llvm::GlobalValue *GV,
Nate Begeman8bd4afe2008-04-19 04:17:09 +00001003 const AnnotateAttr *AA,
Julien Lerouge77f68bb2011-09-09 22:41:49 +00001004 SourceLocation L) {
1005 // Get the globals for file name, annotation, and the line number.
1006 llvm::Constant *AnnoGV = EmitAnnotationString(AA->getAnnotation()),
1007 *UnitGV = EmitAnnotationUnit(L),
1008 *LineNoCst = EmitAnnotationLineNo(L);
Nate Begeman8bd4afe2008-04-19 04:17:09 +00001009
Daniel Dunbar57d5cee2009-04-14 22:41:13 +00001010 // Create the ConstantStruct for the global annotation.
Nate Begeman8bd4afe2008-04-19 04:17:09 +00001011 llvm::Constant *Fields[4] = {
Julien Lerouge77f68bb2011-09-09 22:41:49 +00001012 llvm::ConstantExpr::getBitCast(GV, Int8PtrTy),
1013 llvm::ConstantExpr::getBitCast(AnnoGV, Int8PtrTy),
1014 llvm::ConstantExpr::getBitCast(UnitGV, Int8PtrTy),
1015 LineNoCst
Nate Begeman8bd4afe2008-04-19 04:17:09 +00001016 };
Chris Lattnerc5cbb902011-06-20 04:01:35 +00001017 return llvm::ConstantStruct::getAnon(Fields);
Nate Begeman8bd4afe2008-04-19 04:17:09 +00001018}
1019
Julien Lerouge77f68bb2011-09-09 22:41:49 +00001020void CodeGenModule::AddGlobalAnnotations(const ValueDecl *D,
1021 llvm::GlobalValue *GV) {
1022 assert(D->hasAttr<AnnotateAttr>() && "no annotate attribute");
1023 // Get the struct elements for these annotations.
1024 for (specific_attr_iterator<AnnotateAttr>
1025 ai = D->specific_attr_begin<AnnotateAttr>(),
1026 ae = D->specific_attr_end<AnnotateAttr>(); ai != ae; ++ai)
1027 Annotations.push_back(EmitAnnotateAttr(GV, *ai, D->getLocation()));
1028}
1029
Argyrios Kyrtzidisa6d6af32010-07-27 22:37:14 +00001030bool CodeGenModule::MayDeferGeneration(const ValueDecl *Global) {
Argyrios Kyrtzidis90e99a82010-07-29 18:15:58 +00001031 // Never defer when EmitAllDecls is specified.
David Blaikie4e4d0842012-03-11 07:00:24 +00001032 if (LangOpts.EmitAllDecls)
Daniel Dunbar73241df2009-02-13 21:18:01 +00001033 return false;
Daniel Dunbarbd012ff2008-07-29 23:18:29 +00001034
Argyrios Kyrtzidis4ac7c0b2010-07-29 20:08:05 +00001035 return !getContext().DeclMustBeEmitted(Global);
Daniel Dunbar73241df2009-02-13 21:18:01 +00001036}
1037
Nico Weberc5f80462012-10-11 10:13:44 +00001038llvm::Constant *CodeGenModule::GetAddrOfUuidDescriptor(
1039 const CXXUuidofExpr* E) {
1040 // Sema has verified that IIDSource has a __declspec(uuid()), and that its
1041 // well-formed.
1042 StringRef Uuid;
1043 if (E->isTypeOperand())
1044 Uuid = CXXUuidofExpr::GetUuidAttrOfType(E->getTypeOperand())->getGuid();
1045 else {
1046 // Special case: __uuidof(0) means an all-zero GUID.
1047 Expr *Op = E->getExprOperand();
1048 if (!Op->isNullPointerConstant(Context, Expr::NPC_ValueDependentIsNull))
1049 Uuid = CXXUuidofExpr::GetUuidAttrOfType(Op->getType())->getGuid();
1050 else
1051 Uuid = "00000000-0000-0000-0000-000000000000";
1052 }
1053 std::string Name = "__uuid_" + Uuid.str();
1054
1055 // Look for an existing global.
1056 if (llvm::GlobalVariable *GV = getModule().getNamedGlobal(Name))
1057 return GV;
1058
1059 llvm::Constant *Init = EmitUuidofInitializer(Uuid, E->getType());
1060 assert(Init && "failed to initialize as constant");
1061
1062 // GUIDs are assumed to be 16 bytes, spread over 4-2-2-8 bytes. However, the
1063 // first field is declared as "long", which for many targets is 8 bytes.
1064 // Those architectures are not supported. (With the MS abi, long is always 4
1065 // bytes.)
1066 llvm::Type *GuidType = getTypes().ConvertType(E->getType());
1067 if (Init->getType() != GuidType) {
1068 DiagnosticsEngine &Diags = getDiags();
1069 unsigned DiagID = Diags.getCustomDiagID(DiagnosticsEngine::Error,
1070 "__uuidof codegen is not supported on this architecture");
1071 Diags.Report(E->getExprLoc(), DiagID) << E->getSourceRange();
1072 Init = llvm::UndefValue::get(GuidType);
1073 }
1074
1075 llvm::GlobalVariable *GV = new llvm::GlobalVariable(getModule(), GuidType,
1076 /*isConstant=*/true, llvm::GlobalValue::PrivateLinkage, Init, Name);
1077 GV->setUnnamedAddr(true);
1078 return GV;
1079}
1080
Rafael Espindola6a836702010-03-04 18:17:24 +00001081llvm::Constant *CodeGenModule::GetWeakRefReference(const ValueDecl *VD) {
1082 const AliasAttr *AA = VD->getAttr<AliasAttr>();
1083 assert(AA && "No alias?");
1084
Chris Lattner2acc6e32011-07-18 04:24:23 +00001085 llvm::Type *DeclTy = getTypes().ConvertTypeForMem(VD->getType());
Rafael Espindola6a836702010-03-04 18:17:24 +00001086
Rafael Espindola6a836702010-03-04 18:17:24 +00001087 // See if there is already something with the target's name in the module.
John McCallf746aa62010-03-19 23:29:14 +00001088 llvm::GlobalValue *Entry = GetGlobalValue(AA->getAliasee());
Joerg Sonnenberger4695f912012-10-16 17:45:27 +00001089 if (Entry) {
1090 unsigned AS = getContext().getTargetAddressSpace(VD->getType());
1091 return llvm::ConstantExpr::getBitCast(Entry, DeclTy->getPointerTo(AS));
1092 }
Rafael Espindola6a836702010-03-04 18:17:24 +00001093
1094 llvm::Constant *Aliasee;
1095 if (isa<llvm::FunctionType>(DeclTy))
Alex Rosenbergc857ce82012-10-05 23:12:53 +00001096 Aliasee = GetOrCreateLLVMFunction(AA->getAliasee(), DeclTy,
1097 GlobalDecl(cast<FunctionDecl>(VD)),
Anders Carlsson1faa89f2011-02-05 04:35:53 +00001098 /*ForVTable=*/false);
Rafael Espindola6a836702010-03-04 18:17:24 +00001099 else
John McCallf746aa62010-03-19 23:29:14 +00001100 Aliasee = GetOrCreateLLVMGlobal(AA->getAliasee(),
Rafael Espindola6a836702010-03-04 18:17:24 +00001101 llvm::PointerType::getUnqual(DeclTy), 0);
Joerg Sonnenberger4695f912012-10-16 17:45:27 +00001102
1103 llvm::GlobalValue* F = cast<llvm::GlobalValue>(Aliasee);
1104 F->setLinkage(llvm::Function::ExternalWeakLinkage);
1105 WeakRefReferences.insert(F);
Rafael Espindola6a836702010-03-04 18:17:24 +00001106
1107 return Aliasee;
1108}
1109
Chris Lattnerb4880ba2009-05-12 21:21:08 +00001110void CodeGenModule::EmitGlobal(GlobalDecl GD) {
Anders Carlsson4a6835e2009-09-10 23:38:47 +00001111 const ValueDecl *Global = cast<ValueDecl>(GD.getDecl());
Mike Stump1eb44332009-09-09 15:08:12 +00001112
Rafael Espindola6a836702010-03-04 18:17:24 +00001113 // Weak references don't produce any output by themselves.
1114 if (Global->hasAttr<WeakRefAttr>())
1115 return;
1116
Chris Lattnerbd532712009-03-22 21:47:11 +00001117 // If this is an alias definition (which otherwise looks like a declaration)
1118 // emit it now.
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +00001119 if (Global->hasAttr<AliasAttr>())
John McCallf746aa62010-03-19 23:29:14 +00001120 return EmitAliasDefinition(GD);
Daniel Dunbar219df662008-09-08 23:44:31 +00001121
Peter Collingbourned51e43a2011-10-06 18:29:46 +00001122 // If this is CUDA, be selective about which declarations we emit.
David Blaikie4e4d0842012-03-11 07:00:24 +00001123 if (LangOpts.CUDA) {
Peter Collingbourned51e43a2011-10-06 18:29:46 +00001124 if (CodeGenOpts.CUDAIsDevice) {
1125 if (!Global->hasAttr<CUDADeviceAttr>() &&
1126 !Global->hasAttr<CUDAGlobalAttr>() &&
1127 !Global->hasAttr<CUDAConstantAttr>() &&
1128 !Global->hasAttr<CUDASharedAttr>())
1129 return;
1130 } else {
1131 if (!Global->hasAttr<CUDAHostAttr>() && (
1132 Global->hasAttr<CUDADeviceAttr>() ||
1133 Global->hasAttr<CUDAConstantAttr>() ||
1134 Global->hasAttr<CUDASharedAttr>()))
1135 return;
1136 }
1137 }
1138
Chris Lattner67b00522009-03-21 09:44:56 +00001139 // Ignore declarations, they will be emitted on their first use.
Daniel Dunbar5e1e1f92009-03-19 08:27:24 +00001140 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(Global)) {
Daniel Dunbar73241df2009-02-13 21:18:01 +00001141 // Forward declarations are emitted lazily on first use.
Nick Lewyckydce67a72011-07-18 05:26:13 +00001142 if (!FD->doesThisDeclarationHaveABody()) {
1143 if (!FD->doesDeclarationForceExternallyVisibleDefinition())
1144 return;
1145
1146 const FunctionDecl *InlineDefinition = 0;
1147 FD->getBody(InlineDefinition);
1148
Chris Lattner5f9e2722011-07-23 10:55:15 +00001149 StringRef MangledName = getMangledName(GD);
Benjamin Kramer7e423922012-03-24 18:22:12 +00001150 DeferredDecls.erase(MangledName);
Nick Lewyckydce67a72011-07-18 05:26:13 +00001151 EmitGlobalDefinition(InlineDefinition);
Daniel Dunbar73241df2009-02-13 21:18:01 +00001152 return;
Nick Lewyckydce67a72011-07-18 05:26:13 +00001153 }
Daniel Dunbar02698712009-02-13 20:29:50 +00001154 } else {
1155 const VarDecl *VD = cast<VarDecl>(Global);
Daniel Dunbarbd012ff2008-07-29 23:18:29 +00001156 assert(VD->isFileVarDecl() && "Cannot emit local var decl as global.");
1157
Douglas Gregora9a55c02010-02-06 05:15:45 +00001158 if (VD->isThisDeclarationADefinition() != VarDecl::Definition)
Douglas Gregorb6c8c8b2009-04-21 17:11:58 +00001159 return;
Nate Begeman4c13b7a2008-04-20 06:29:50 +00001160 }
1161
Chris Lattner67b00522009-03-21 09:44:56 +00001162 // Defer code generation when possible if this is a static definition, inline
1163 // function etc. These we only want to emit if they are used.
Chris Lattner4357a822010-04-13 17:39:09 +00001164 if (!MayDeferGeneration(Global)) {
1165 // Emit the definition if it can't be deferred.
1166 EmitGlobalDefinition(GD);
Daniel Dunbarbd012ff2008-07-29 23:18:29 +00001167 return;
1168 }
John McCallbf40cb52010-07-15 23:40:35 +00001169
1170 // If we're deferring emission of a C++ variable with an
1171 // initializer, remember the order in which it appeared in the file.
David Blaikie4e4d0842012-03-11 07:00:24 +00001172 if (getLangOpts().CPlusPlus && isa<VarDecl>(Global) &&
John McCallbf40cb52010-07-15 23:40:35 +00001173 cast<VarDecl>(Global)->hasInit()) {
1174 DelayedCXXInitPosition[Global] = CXXGlobalInits.size();
1175 CXXGlobalInits.push_back(0);
1176 }
Chris Lattner4357a822010-04-13 17:39:09 +00001177
1178 // If the value has already been used, add it directly to the
1179 // DeferredDeclsToEmit list.
Chris Lattner5f9e2722011-07-23 10:55:15 +00001180 StringRef MangledName = getMangledName(GD);
Chris Lattner4357a822010-04-13 17:39:09 +00001181 if (GetGlobalValue(MangledName))
1182 DeferredDeclsToEmit.push_back(GD);
1183 else {
1184 // Otherwise, remember that we saw a deferred decl with this name. The
1185 // first use of the mangled name will cause it to move into
1186 // DeferredDeclsToEmit.
1187 DeferredDecls[MangledName] = GD;
1188 }
Nate Begeman4c13b7a2008-04-20 06:29:50 +00001189}
1190
Rafael Espindolaa411d2f2011-10-26 20:41:06 +00001191namespace {
1192 struct FunctionIsDirectlyRecursive :
1193 public RecursiveASTVisitor<FunctionIsDirectlyRecursive> {
1194 const StringRef Name;
Rafael Espindolabcf6b982011-12-19 14:41:01 +00001195 const Builtin::Context &BI;
Rafael Espindolaa411d2f2011-10-26 20:41:06 +00001196 bool Result;
Rafael Espindolabcf6b982011-12-19 14:41:01 +00001197 FunctionIsDirectlyRecursive(StringRef N, const Builtin::Context &C) :
1198 Name(N), BI(C), Result(false) {
Rafael Espindolaa411d2f2011-10-26 20:41:06 +00001199 }
1200 typedef RecursiveASTVisitor<FunctionIsDirectlyRecursive> Base;
1201
1202 bool TraverseCallExpr(CallExpr *E) {
Rafael Espindolabcf6b982011-12-19 14:41:01 +00001203 const FunctionDecl *FD = E->getDirectCallee();
1204 if (!FD)
Rafael Espindolaa411d2f2011-10-26 20:41:06 +00001205 return true;
Rafael Espindolabcf6b982011-12-19 14:41:01 +00001206 AsmLabelAttr *Attr = FD->getAttr<AsmLabelAttr>();
1207 if (Attr && Name == Attr->getLabel()) {
1208 Result = true;
1209 return false;
1210 }
1211 unsigned BuiltinID = FD->getBuiltinID();
1212 if (!BuiltinID)
Rafael Espindolaa411d2f2011-10-26 20:41:06 +00001213 return true;
Nick Lewyckyf6b56372012-01-18 03:41:19 +00001214 StringRef BuiltinName = BI.GetName(BuiltinID);
1215 if (BuiltinName.startswith("__builtin_") &&
1216 Name == BuiltinName.slice(strlen("__builtin_"), StringRef::npos)) {
Rafael Espindolaa411d2f2011-10-26 20:41:06 +00001217 Result = true;
1218 return false;
1219 }
1220 return true;
1221 }
1222 };
1223}
1224
Rafael Espindolabcf6b982011-12-19 14:41:01 +00001225// isTriviallyRecursive - Check if this function calls another
1226// decl that, because of the asm attribute or the other decl being a builtin,
1227// ends up pointing to itself.
Rafael Espindolaa411d2f2011-10-26 20:41:06 +00001228bool
Rafael Espindolabcf6b982011-12-19 14:41:01 +00001229CodeGenModule::isTriviallyRecursive(const FunctionDecl *FD) {
1230 StringRef Name;
1231 if (getCXXABI().getMangleContext().shouldMangleDeclName(FD)) {
Nick Lewycky22afacc2012-01-18 01:50:13 +00001232 // asm labels are a special kind of mangling we have to support.
Rafael Espindolabcf6b982011-12-19 14:41:01 +00001233 AsmLabelAttr *Attr = FD->getAttr<AsmLabelAttr>();
1234 if (!Attr)
1235 return false;
1236 Name = Attr->getLabel();
1237 } else {
1238 Name = FD->getName();
1239 }
Rafael Espindolaa411d2f2011-10-26 20:41:06 +00001240
Rafael Espindolabcf6b982011-12-19 14:41:01 +00001241 FunctionIsDirectlyRecursive Walker(Name, Context.BuiltinInfo);
1242 Walker.TraverseFunctionDecl(const_cast<FunctionDecl*>(FD));
Rafael Espindolaa411d2f2011-10-26 20:41:06 +00001243 return Walker.Result;
1244}
1245
1246bool
Peter Collingbourne144a31f2013-06-05 17:49:37 +00001247CodeGenModule::shouldEmitFunction(GlobalDecl GD) {
1248 if (getFunctionLinkage(GD) != llvm::Function::AvailableExternallyLinkage)
Rafael Espindolaa411d2f2011-10-26 20:41:06 +00001249 return true;
Peter Collingbourne144a31f2013-06-05 17:49:37 +00001250 const FunctionDecl *F = cast<FunctionDecl>(GD.getDecl());
Rafael Espindolacc4889f2011-10-28 20:43:56 +00001251 if (CodeGenOpts.OptimizationLevel == 0 &&
Michael J. Spenceradc6cbf2012-06-18 07:00:48 +00001252 !F->hasAttr<AlwaysInlineAttr>() && !F->hasAttr<ForceInlineAttr>())
Rafael Espindolaa411d2f2011-10-26 20:41:06 +00001253 return false;
1254 // PR9614. Avoid cases where the source code is lying to us. An available
1255 // externally function should have an equivalent function somewhere else,
1256 // but a function that calls itself is clearly not equivalent to the real
1257 // implementation.
1258 // This happens in glibc's btowc and in some configure checks.
Rafael Espindolabcf6b982011-12-19 14:41:01 +00001259 return !isTriviallyRecursive(F);
Rafael Espindolaa411d2f2011-10-26 20:41:06 +00001260}
1261
Adrian Prantl0a050f72013-05-09 23:16:27 +00001262/// If the type for the method's class was generated by
1263/// CGDebugInfo::createContextChain(), the cache contains only a
1264/// limited DIType without any declarations. Since EmitFunctionStart()
1265/// needs to find the canonical declaration for each method, we need
1266/// to construct the complete type prior to emitting the method.
1267void CodeGenModule::CompleteDIClassType(const CXXMethodDecl* D) {
1268 if (!D->isInstance())
1269 return;
1270
1271 if (CGDebugInfo *DI = getModuleDebugInfo())
1272 if (getCodeGenOpts().getDebugInfo() >= CodeGenOptions::LimitedDebugInfo) {
1273 const PointerType *ThisPtr =
1274 cast<PointerType>(D->getThisType(getContext()));
1275 DI->getOrCreateRecordType(ThisPtr->getPointeeType(), D->getLocation());
1276 }
1277}
1278
Chris Lattnerb4880ba2009-05-12 21:21:08 +00001279void CodeGenModule::EmitGlobalDefinition(GlobalDecl GD) {
Anders Carlsson4a6835e2009-09-10 23:38:47 +00001280 const ValueDecl *D = cast<ValueDecl>(GD.getDecl());
Mike Stump1eb44332009-09-09 15:08:12 +00001281
Dan Gohmancb421fa2010-04-19 16:39:44 +00001282 PrettyStackTraceDecl CrashInfo(const_cast<ValueDecl *>(D), D->getLocation(),
Anders Carlsson8e2efcc2009-10-27 14:32:27 +00001283 Context.getSourceManager(),
1284 "Generating code for declaration");
1285
Peter Collingbourne144a31f2013-06-05 17:49:37 +00001286 if (isa<FunctionDecl>(D)) {
Douglas Gregor44eac332010-07-13 06:02:28 +00001287 // At -O0, don't generate IR for functions with available_externally
1288 // linkage.
Peter Collingbourne144a31f2013-06-05 17:49:37 +00001289 if (!shouldEmitFunction(GD))
Douglas Gregor44eac332010-07-13 06:02:28 +00001290 return;
Anders Carlsson7270ee42010-03-23 04:31:31 +00001291
Douglas Gregor44eac332010-07-13 06:02:28 +00001292 if (const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) {
Adrian Prantl0a050f72013-05-09 23:16:27 +00001293 CompleteDIClassType(Method);
Eli Friedman7dcdf5b2011-05-06 17:27:27 +00001294 // Make sure to emit the definition(s) before we emit the thunks.
1295 // This is necessary for the generation of certain thunks.
1296 if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(Method))
1297 EmitCXXConstructor(CD, GD.getCtorType());
1298 else if (const CXXDestructorDecl *DD =dyn_cast<CXXDestructorDecl>(Method))
1299 EmitCXXDestructor(DD, GD.getDtorType());
1300 else
1301 EmitGlobalFunctionDefinition(GD);
1302
Douglas Gregor44eac332010-07-13 06:02:28 +00001303 if (Method->isVirtual())
1304 getVTables().EmitThunks(GD);
1305
Eli Friedman7dcdf5b2011-05-06 17:27:27 +00001306 return;
Douglas Gregor44eac332010-07-13 06:02:28 +00001307 }
Chris Lattnerb5e81562010-04-13 17:57:11 +00001308
Chris Lattnerb5e81562010-04-13 17:57:11 +00001309 return EmitGlobalFunctionDefinition(GD);
Douglas Gregor44eac332010-07-13 06:02:28 +00001310 }
Chris Lattnerb5e81562010-04-13 17:57:11 +00001311
1312 if (const VarDecl *VD = dyn_cast<VarDecl>(D))
1313 return EmitGlobalVarDefinition(VD);
Chris Lattner4357a822010-04-13 17:39:09 +00001314
David Blaikieb219cfc2011-09-23 05:06:16 +00001315 llvm_unreachable("Invalid argument to EmitGlobalDefinition()");
Daniel Dunbarbd012ff2008-07-29 23:18:29 +00001316}
1317
Chris Lattner74391b42009-03-22 21:03:39 +00001318/// GetOrCreateLLVMFunction - If the specified mangled name is not in the
1319/// module, create and return an llvm Function with the specified type. If there
1320/// is something in the module with the specified name, return it potentially
1321/// bitcasted to the right type.
1322///
1323/// If D is non-null, it specifies a decl that correspond to this. This is used
1324/// to set the attributes on the function when it is first created.
John McCallf746aa62010-03-19 23:29:14 +00001325llvm::Constant *
Chris Lattner5f9e2722011-07-23 10:55:15 +00001326CodeGenModule::GetOrCreateLLVMFunction(StringRef MangledName,
Chris Lattner2acc6e32011-07-18 04:24:23 +00001327 llvm::Type *Ty,
John McCallf85e1932011-06-15 23:02:42 +00001328 GlobalDecl D, bool ForVTable,
Bill Wendlingc4c62fd2013-01-31 00:30:05 +00001329 llvm::AttributeSet ExtraAttrs) {
Chris Lattner0558e792009-03-21 09:25:43 +00001330 // Lookup the entry, lazily creating it if necessary.
John McCallf746aa62010-03-19 23:29:14 +00001331 llvm::GlobalValue *Entry = GetGlobalValue(MangledName);
Chris Lattner0558e792009-03-21 09:25:43 +00001332 if (Entry) {
Benjamin Kramerd48bcb22012-08-22 15:37:55 +00001333 if (WeakRefReferences.erase(Entry)) {
Rafael Espindola6a836702010-03-04 18:17:24 +00001334 const FunctionDecl *FD = cast_or_null<FunctionDecl>(D.getDecl());
1335 if (FD && !FD->hasAttr<WeakAttr>())
Anders Carlsson7270ee42010-03-23 04:31:31 +00001336 Entry->setLinkage(llvm::Function::ExternalLinkage);
Rafael Espindola6a836702010-03-04 18:17:24 +00001337 }
1338
Chris Lattner0558e792009-03-21 09:25:43 +00001339 if (Entry->getType()->getElementType() == Ty)
1340 return Entry;
Mike Stump1eb44332009-09-09 15:08:12 +00001341
Chris Lattner0558e792009-03-21 09:25:43 +00001342 // Make sure the result is of the correct type.
Chris Lattner9cbe4f02011-07-09 17:41:47 +00001343 return llvm::ConstantExpr::getBitCast(Entry, Ty->getPointerTo());
Chris Lattner0558e792009-03-21 09:25:43 +00001344 }
Mike Stump1eb44332009-09-09 15:08:12 +00001345
Eli Friedman654ad402009-11-09 05:07:37 +00001346 // This function doesn't have a complete type (for example, the return
1347 // type is an incomplete struct). Use a fake type instead, and make
1348 // sure not to try to set attributes.
1349 bool IsIncompleteFunction = false;
John McCall784f2112010-04-28 00:00:30 +00001350
Chris Lattner2acc6e32011-07-18 04:24:23 +00001351 llvm::FunctionType *FTy;
John McCall784f2112010-04-28 00:00:30 +00001352 if (isa<llvm::FunctionType>(Ty)) {
1353 FTy = cast<llvm::FunctionType>(Ty);
1354 } else {
John McCall0774cb82011-05-15 01:53:33 +00001355 FTy = llvm::FunctionType::get(VoidTy, false);
Eli Friedman654ad402009-11-09 05:07:37 +00001356 IsIncompleteFunction = true;
1357 }
Chris Lattnerbcaedae2010-06-30 19:14:05 +00001358
John McCall784f2112010-04-28 00:00:30 +00001359 llvm::Function *F = llvm::Function::Create(FTy,
Eli Friedman654ad402009-11-09 05:07:37 +00001360 llvm::Function::ExternalLinkage,
John McCallf746aa62010-03-19 23:29:14 +00001361 MangledName, &getModule());
1362 assert(F->getName() == MangledName && "name was uniqued!");
Eli Friedman654ad402009-11-09 05:07:37 +00001363 if (D.getDecl())
Anders Carlssonb2bcf1c2010-02-06 02:44:09 +00001364 SetFunctionAttributes(D, F, IsIncompleteFunction);
Bill Wendlingc4c62fd2013-01-31 00:30:05 +00001365 if (ExtraAttrs.hasAttributes(llvm::AttributeSet::FunctionIndex)) {
1366 llvm::AttrBuilder B(ExtraAttrs, llvm::AttributeSet::FunctionIndex);
Bill Wendling909b6de2013-01-23 00:21:06 +00001367 F->addAttributes(llvm::AttributeSet::FunctionIndex,
1368 llvm::AttributeSet::get(VMContext,
1369 llvm::AttributeSet::FunctionIndex,
1370 B));
1371 }
Eli Friedman654ad402009-11-09 05:07:37 +00001372
Chris Lattner67b00522009-03-21 09:44:56 +00001373 // This is the first use or definition of a mangled name. If there is a
1374 // deferred decl with this name, remember that we need to emit it at the end
1375 // of the file.
John McCallf746aa62010-03-19 23:29:14 +00001376 llvm::StringMap<GlobalDecl>::iterator DDI = DeferredDecls.find(MangledName);
Chris Lattner67b00522009-03-21 09:44:56 +00001377 if (DDI != DeferredDecls.end()) {
1378 // Move the potentially referenced deferred decl to the DeferredDeclsToEmit
1379 // list, and remove it from DeferredDecls (since we don't need it anymore).
1380 DeferredDeclsToEmit.push_back(DDI->second);
1381 DeferredDecls.erase(DDI);
John McCallbfdcdc82010-12-15 04:00:32 +00001382
1383 // Otherwise, there are cases we have to worry about where we're
1384 // using a declaration for which we must emit a definition but where
1385 // we might not find a top-level definition:
1386 // - member functions defined inline in their classes
1387 // - friend functions defined inline in some class
1388 // - special member functions with implicit definitions
1389 // If we ever change our AST traversal to walk into class methods,
1390 // this will be unnecessary.
Anders Carlsson1faa89f2011-02-05 04:35:53 +00001391 //
1392 // We also don't emit a definition for a function if it's going to be an entry
1393 // in a vtable, unless it's already marked as used.
David Blaikie4e4d0842012-03-11 07:00:24 +00001394 } else if (getLangOpts().CPlusPlus && D.getDecl()) {
John McCallbfdcdc82010-12-15 04:00:32 +00001395 // Look for a declaration that's lexically in a record.
1396 const FunctionDecl *FD = cast<FunctionDecl>(D.getDecl());
Eli Friedmanb135f0f2012-07-02 21:05:30 +00001397 FD = FD->getMostRecentDecl();
John McCallbfdcdc82010-12-15 04:00:32 +00001398 do {
1399 if (isa<CXXRecordDecl>(FD->getLexicalDeclContext())) {
Anders Carlsson1faa89f2011-02-05 04:35:53 +00001400 if (FD->isImplicit() && !ForVTable) {
John McCallbfdcdc82010-12-15 04:00:32 +00001401 assert(FD->isUsed() && "Sema didn't mark implicit function as used!");
Douglas Gregora29bf412011-02-09 02:03:05 +00001402 DeferredDeclsToEmit.push_back(D.getWithDecl(FD));
John McCallbfdcdc82010-12-15 04:00:32 +00001403 break;
Sean Hunt10620eb2011-05-06 20:44:56 +00001404 } else if (FD->doesThisDeclarationHaveABody()) {
Douglas Gregora29bf412011-02-09 02:03:05 +00001405 DeferredDeclsToEmit.push_back(D.getWithDecl(FD));
John McCallbfdcdc82010-12-15 04:00:32 +00001406 break;
1407 }
Rafael Espindola7b9a5aa2010-03-02 21:28:26 +00001408 }
Douglas Gregoref96ee02012-01-14 16:38:05 +00001409 FD = FD->getPreviousDecl();
John McCallbfdcdc82010-12-15 04:00:32 +00001410 } while (FD);
Chris Lattner67b00522009-03-21 09:44:56 +00001411 }
Mike Stump1eb44332009-09-09 15:08:12 +00001412
John McCall784f2112010-04-28 00:00:30 +00001413 // Make sure the result is of the requested type.
1414 if (!IsIncompleteFunction) {
1415 assert(F->getType()->getElementType() == Ty);
1416 return F;
1417 }
1418
Chris Lattner9cbe4f02011-07-09 17:41:47 +00001419 llvm::Type *PTy = llvm::PointerType::getUnqual(Ty);
John McCall784f2112010-04-28 00:00:30 +00001420 return llvm::ConstantExpr::getBitCast(F, PTy);
Chris Lattner0558e792009-03-21 09:25:43 +00001421}
1422
Chris Lattner74391b42009-03-22 21:03:39 +00001423/// GetAddrOfFunction - Return the address of the given function. If Ty is
1424/// non-null, then this function will use the specified type if it has to
1425/// create it (this occurs when we see a definition of the function).
Chris Lattnerb4880ba2009-05-12 21:21:08 +00001426llvm::Constant *CodeGenModule::GetAddrOfFunction(GlobalDecl GD,
Chris Lattner2acc6e32011-07-18 04:24:23 +00001427 llvm::Type *Ty,
Anders Carlsson1faa89f2011-02-05 04:35:53 +00001428 bool ForVTable) {
Chris Lattner74391b42009-03-22 21:03:39 +00001429 // If there was no specific requested type, just convert it now.
1430 if (!Ty)
Anders Carlsson4a6835e2009-09-10 23:38:47 +00001431 Ty = getTypes().ConvertType(cast<ValueDecl>(GD.getDecl())->getType());
Chris Lattnerbcaedae2010-06-30 19:14:05 +00001432
Chris Lattner5f9e2722011-07-23 10:55:15 +00001433 StringRef MangledName = getMangledName(GD);
Anders Carlsson1faa89f2011-02-05 04:35:53 +00001434 return GetOrCreateLLVMFunction(MangledName, Ty, GD, ForVTable);
Chris Lattner74391b42009-03-22 21:03:39 +00001435}
Eli Friedman77ba7082008-05-30 19:50:47 +00001436
Chris Lattner74391b42009-03-22 21:03:39 +00001437/// CreateRuntimeFunction - Create a new runtime function with the specified
1438/// type and name.
1439llvm::Constant *
Chris Lattner2acc6e32011-07-18 04:24:23 +00001440CodeGenModule::CreateRuntimeFunction(llvm::FunctionType *FTy,
Chris Lattner5f9e2722011-07-23 10:55:15 +00001441 StringRef Name,
Bill Wendlingc4c62fd2013-01-31 00:30:05 +00001442 llvm::AttributeSet ExtraAttrs) {
John McCallbd7370a2013-02-28 19:01:20 +00001443 llvm::Constant *C
1444 = GetOrCreateLLVMFunction(Name, FTy, GlobalDecl(), /*ForVTable=*/false,
1445 ExtraAttrs);
1446 if (llvm::Function *F = dyn_cast<llvm::Function>(C))
1447 if (F->empty())
1448 F->setCallingConv(getRuntimeCC());
1449 return C;
Chris Lattner74391b42009-03-22 21:03:39 +00001450}
Daniel Dunbarbd012ff2008-07-29 23:18:29 +00001451
Richard Smitha9b21d22012-02-17 06:48:11 +00001452/// isTypeConstant - Determine whether an object of this type can be emitted
1453/// as a constant.
1454///
1455/// If ExcludeCtor is true, the duration when the object's constructor runs
1456/// will not be considered. The caller will need to verify that the object is
1457/// not written to during its construction.
1458bool CodeGenModule::isTypeConstant(QualType Ty, bool ExcludeCtor) {
1459 if (!Ty.isConstant(Context) && !Ty->isReferenceType())
Eli Friedman20e098b2009-12-11 21:23:03 +00001460 return false;
Richard Smitha9b21d22012-02-17 06:48:11 +00001461
David Blaikie4e4d0842012-03-11 07:00:24 +00001462 if (Context.getLangOpts().CPlusPlus) {
Richard Smitha9b21d22012-02-17 06:48:11 +00001463 if (const CXXRecordDecl *Record
1464 = Context.getBaseElementType(Ty)->getAsCXXRecordDecl())
1465 return ExcludeCtor && !Record->hasMutableFields() &&
1466 Record->hasTrivialDestructor();
Eli Friedman20e098b2009-12-11 21:23:03 +00001467 }
Richard Smitha9b21d22012-02-17 06:48:11 +00001468
Eli Friedman20e098b2009-12-11 21:23:03 +00001469 return true;
1470}
1471
Chris Lattner74391b42009-03-22 21:03:39 +00001472/// GetOrCreateLLVMGlobal - If the specified mangled name is not in the module,
1473/// create and return an llvm GlobalVariable with the specified type. If there
1474/// is something in the module with the specified name, return it potentially
1475/// bitcasted to the right type.
1476///
1477/// If D is non-null, it specifies a decl that correspond to this. This is used
1478/// to set the attributes on the global when it is first created.
John McCallf746aa62010-03-19 23:29:14 +00001479llvm::Constant *
Chris Lattner5f9e2722011-07-23 10:55:15 +00001480CodeGenModule::GetOrCreateLLVMGlobal(StringRef MangledName,
Chris Lattner2acc6e32011-07-18 04:24:23 +00001481 llvm::PointerType *Ty,
Rafael Espindolac532b502011-01-18 21:07:57 +00001482 const VarDecl *D,
1483 bool UnnamedAddr) {
Daniel Dunbar3c827a72008-08-05 23:31:02 +00001484 // Lookup the entry, lazily creating it if necessary.
John McCallf746aa62010-03-19 23:29:14 +00001485 llvm::GlobalValue *Entry = GetGlobalValue(MangledName);
Chris Lattner99b53612009-03-21 08:03:33 +00001486 if (Entry) {
Benjamin Kramerd48bcb22012-08-22 15:37:55 +00001487 if (WeakRefReferences.erase(Entry)) {
Rafael Espindola6a836702010-03-04 18:17:24 +00001488 if (D && !D->hasAttr<WeakAttr>())
Anders Carlsson7270ee42010-03-23 04:31:31 +00001489 Entry->setLinkage(llvm::Function::ExternalLinkage);
Rafael Espindola6a836702010-03-04 18:17:24 +00001490 }
1491
Rafael Espindolac532b502011-01-18 21:07:57 +00001492 if (UnnamedAddr)
1493 Entry->setUnnamedAddr(true);
1494
Chris Lattner74391b42009-03-22 21:03:39 +00001495 if (Entry->getType() == Ty)
Chris Lattner570585c2009-03-21 09:16:30 +00001496 return Entry;
Mike Stump1eb44332009-09-09 15:08:12 +00001497
Chris Lattner99b53612009-03-21 08:03:33 +00001498 // Make sure the result is of the correct type.
Owen Anderson3c4972d2009-07-29 18:54:39 +00001499 return llvm::ConstantExpr::getBitCast(Entry, Ty);
Daniel Dunbar49988882009-01-13 02:25:00 +00001500 }
Mike Stump1eb44332009-09-09 15:08:12 +00001501
Chris Lattner67b00522009-03-21 09:44:56 +00001502 // This is the first use or definition of a mangled name. If there is a
1503 // deferred decl with this name, remember that we need to emit it at the end
1504 // of the file.
John McCallf746aa62010-03-19 23:29:14 +00001505 llvm::StringMap<GlobalDecl>::iterator DDI = DeferredDecls.find(MangledName);
Chris Lattner67b00522009-03-21 09:44:56 +00001506 if (DDI != DeferredDecls.end()) {
1507 // Move the potentially referenced deferred decl to the DeferredDeclsToEmit
1508 // list, and remove it from DeferredDecls (since we don't need it anymore).
1509 DeferredDeclsToEmit.push_back(DDI->second);
1510 DeferredDecls.erase(DDI);
1511 }
Mike Stump1eb44332009-09-09 15:08:12 +00001512
Peter Collingbourne4dc34eb2012-05-20 21:08:35 +00001513 unsigned AddrSpace = GetGlobalVarAddressSpace(D, Ty->getAddressSpace());
Mike Stump1eb44332009-09-09 15:08:12 +00001514 llvm::GlobalVariable *GV =
1515 new llvm::GlobalVariable(getModule(), Ty->getElementType(), false,
Chris Lattner99b53612009-03-21 08:03:33 +00001516 llvm::GlobalValue::ExternalLinkage,
John McCallf746aa62010-03-19 23:29:14 +00001517 0, MangledName, 0,
Hans Wennborg5e2d5de2012-06-23 11:51:46 +00001518 llvm::GlobalVariable::NotThreadLocal, AddrSpace);
Chris Lattner99b53612009-03-21 08:03:33 +00001519
1520 // Handle things which are present even on external declarations.
Chris Lattner74391b42009-03-22 21:03:39 +00001521 if (D) {
Mike Stumpf5408fe2009-05-16 07:57:57 +00001522 // FIXME: This code is overly simple and should be merged with other global
1523 // handling.
Richard Smitha9b21d22012-02-17 06:48:11 +00001524 GV->setConstant(isTypeConstant(D->getType(), false));
Chris Lattner99b53612009-03-21 08:03:33 +00001525
John McCall110e8e52010-10-29 22:22:43 +00001526 // Set linkage and visibility in case we never see a definition.
Rafael Espindola2beda122013-02-27 02:15:29 +00001527 LinkageInfo LV = D->getLinkageAndVisibility();
Rafael Espindolaf127eb82013-02-27 02:56:45 +00001528 if (LV.getLinkage() != ExternalLinkage) {
John McCall15e310a2011-02-19 02:53:41 +00001529 // Don't set internal linkage on declarations.
John McCall110e8e52010-10-29 22:22:43 +00001530 } else {
1531 if (D->hasAttr<DLLImportAttr>())
1532 GV->setLinkage(llvm::GlobalValue::DLLImportLinkage);
Douglas Gregor0a0d2b12011-03-23 00:50:03 +00001533 else if (D->hasAttr<WeakAttr>() || D->isWeakImported())
John McCall110e8e52010-10-29 22:22:43 +00001534 GV->setLinkage(llvm::GlobalValue::ExternalWeakLinkage);
Chris Lattner99b53612009-03-21 08:03:33 +00001535
John McCallaf146032010-10-30 11:50:40 +00001536 // Set visibility on a declaration only if it's explicit.
Rafael Espindolaf127eb82013-02-27 02:56:45 +00001537 if (LV.isVisibilityExplicit())
1538 GV->setVisibility(GetLLVMVisibility(LV.getVisibility()));
John McCall110e8e52010-10-29 22:22:43 +00001539 }
Eli Friedman56ebe502009-04-19 21:05:03 +00001540
Richard Smithb80a16e2013-04-19 16:42:07 +00001541 if (D->getTLSKind()) {
Richard Smithdb4f61f2013-04-22 08:06:17 +00001542 if (D->getTLSKind() == VarDecl::TLS_Dynamic)
1543 CXXThreadLocals.push_back(std::make_pair(D, GV));
Hans Wennborgde981f32012-06-28 08:01:44 +00001544 setTLSMode(GV, *D);
Richard Smithb80a16e2013-04-19 16:42:07 +00001545 }
Chris Lattner74391b42009-03-22 21:03:39 +00001546 }
Mike Stump1eb44332009-09-09 15:08:12 +00001547
Peter Collingbourne4dc34eb2012-05-20 21:08:35 +00001548 if (AddrSpace != Ty->getAddressSpace())
1549 return llvm::ConstantExpr::getBitCast(GV, Ty);
1550 else
1551 return GV;
Daniel Dunbarbd012ff2008-07-29 23:18:29 +00001552}
1553
Chris Lattner74391b42009-03-22 21:03:39 +00001554
Anders Carlsson3bd62022011-01-29 18:20:20 +00001555llvm::GlobalVariable *
Chris Lattner5f9e2722011-07-23 10:55:15 +00001556CodeGenModule::CreateOrReplaceCXXRuntimeVariable(StringRef Name,
Chris Lattner2acc6e32011-07-18 04:24:23 +00001557 llvm::Type *Ty,
Anders Carlsson3bd62022011-01-29 18:20:20 +00001558 llvm::GlobalValue::LinkageTypes Linkage) {
1559 llvm::GlobalVariable *GV = getModule().getNamedGlobal(Name);
1560 llvm::GlobalVariable *OldGV = 0;
1561
1562
1563 if (GV) {
1564 // Check if the variable has the right type.
1565 if (GV->getType()->getElementType() == Ty)
1566 return GV;
1567
1568 // Because C++ name mangling, the only way we can end up with an already
1569 // existing global with the same name is if it has been declared extern "C".
Nico Weberc5f80462012-10-11 10:13:44 +00001570 assert(GV->isDeclaration() && "Declaration has wrong type!");
Anders Carlsson3bd62022011-01-29 18:20:20 +00001571 OldGV = GV;
1572 }
1573
1574 // Create a new variable.
1575 GV = new llvm::GlobalVariable(getModule(), Ty, /*isConstant=*/true,
1576 Linkage, 0, Name);
1577
1578 if (OldGV) {
1579 // Replace occurrences of the old variable if needed.
1580 GV->takeName(OldGV);
1581
1582 if (!OldGV->use_empty()) {
1583 llvm::Constant *NewPtrForOldDecl =
1584 llvm::ConstantExpr::getBitCast(GV, OldGV->getType());
1585 OldGV->replaceAllUsesWith(NewPtrForOldDecl);
1586 }
1587
1588 OldGV->eraseFromParent();
1589 }
1590
1591 return GV;
1592}
1593
Chris Lattner74391b42009-03-22 21:03:39 +00001594/// GetAddrOfGlobalVar - Return the llvm::Constant for the address of the
1595/// given global variable. If Ty is non-null and if the global doesn't exist,
Eric Christopher0ff258b2012-04-16 23:55:04 +00001596/// then it will be created with the specified type instead of whatever the
Chris Lattner74391b42009-03-22 21:03:39 +00001597/// normal requested type would be.
1598llvm::Constant *CodeGenModule::GetAddrOfGlobalVar(const VarDecl *D,
Chris Lattner2acc6e32011-07-18 04:24:23 +00001599 llvm::Type *Ty) {
Chris Lattner74391b42009-03-22 21:03:39 +00001600 assert(D->hasGlobalStorage() && "Not a global variable");
1601 QualType ASTTy = D->getType();
1602 if (Ty == 0)
1603 Ty = getTypes().ConvertTypeForMem(ASTTy);
Mike Stump1eb44332009-09-09 15:08:12 +00001604
Chris Lattner2acc6e32011-07-18 04:24:23 +00001605 llvm::PointerType *PTy =
Peter Collingbourne207f4d82011-03-18 22:38:29 +00001606 llvm::PointerType::get(Ty, getContext().getTargetAddressSpace(ASTTy));
John McCallf746aa62010-03-19 23:29:14 +00001607
Chris Lattner5f9e2722011-07-23 10:55:15 +00001608 StringRef MangledName = getMangledName(D);
John McCallf746aa62010-03-19 23:29:14 +00001609 return GetOrCreateLLVMGlobal(MangledName, PTy, D);
Chris Lattner74391b42009-03-22 21:03:39 +00001610}
1611
1612/// CreateRuntimeVariable - Create a new runtime global variable with the
1613/// specified type and name.
1614llvm::Constant *
Chris Lattner2acc6e32011-07-18 04:24:23 +00001615CodeGenModule::CreateRuntimeVariable(llvm::Type *Ty,
Chris Lattner5f9e2722011-07-23 10:55:15 +00001616 StringRef Name) {
John McCall1de4d4e2011-04-07 08:22:57 +00001617 return GetOrCreateLLVMGlobal(Name, llvm::PointerType::getUnqual(Ty), 0,
Rafael Espindolac532b502011-01-18 21:07:57 +00001618 true);
Chris Lattner74391b42009-03-22 21:03:39 +00001619}
1620
Daniel Dunbar03f5ad92009-04-15 22:08:45 +00001621void CodeGenModule::EmitTentativeDefinition(const VarDecl *D) {
1622 assert(!D->getInit() && "Cannot emit definite definitions here!");
1623
Douglas Gregor7520bd12009-04-21 19:28:58 +00001624 if (MayDeferGeneration(D)) {
1625 // If we have not seen a reference to this variable yet, place it
1626 // into the deferred declarations table to be emitted if needed
1627 // later.
Chris Lattner5f9e2722011-07-23 10:55:15 +00001628 StringRef MangledName = getMangledName(D);
John McCallf746aa62010-03-19 23:29:14 +00001629 if (!GetGlobalValue(MangledName)) {
Anders Carlsson555b4bb2009-09-10 23:43:36 +00001630 DeferredDecls[MangledName] = D;
Daniel Dunbar03f5ad92009-04-15 22:08:45 +00001631 return;
Douglas Gregor7520bd12009-04-21 19:28:58 +00001632 }
1633 }
1634
1635 // The tentative definition is the only definition.
Daniel Dunbar03f5ad92009-04-15 22:08:45 +00001636 EmitGlobalVarDefinition(D);
1637}
1638
Chris Lattner2acc6e32011-07-18 04:24:23 +00001639CharUnits CodeGenModule::GetTargetTypeStoreSize(llvm::Type *Ty) const {
Ken Dyck06f486e2011-01-18 02:01:14 +00001640 return Context.toCharUnitsFromBits(
Micah Villmow25a6a842012-10-08 16:25:52 +00001641 TheDataLayout.getTypeStoreSizeInBits(Ty));
Ken Dyck687cc4a2010-01-26 13:48:07 +00001642}
1643
Peter Collingbourne4dc34eb2012-05-20 21:08:35 +00001644unsigned CodeGenModule::GetGlobalVarAddressSpace(const VarDecl *D,
1645 unsigned AddrSpace) {
1646 if (LangOpts.CUDA && CodeGenOpts.CUDAIsDevice) {
1647 if (D->hasAttr<CUDAConstantAttr>())
1648 AddrSpace = getContext().getTargetAddressSpace(LangAS::cuda_constant);
1649 else if (D->hasAttr<CUDASharedAttr>())
1650 AddrSpace = getContext().getTargetAddressSpace(LangAS::cuda_shared);
1651 else
1652 AddrSpace = getContext().getTargetAddressSpace(LangAS::cuda_device);
1653 }
1654
1655 return AddrSpace;
1656}
1657
Richard Smith00249372013-04-06 05:00:46 +00001658template<typename SomeDecl>
1659void CodeGenModule::MaybeHandleStaticInExternC(const SomeDecl *D,
1660 llvm::GlobalValue *GV) {
1661 if (!getLangOpts().CPlusPlus)
1662 return;
1663
1664 // Must have 'used' attribute, or else inline assembly can't rely on
1665 // the name existing.
1666 if (!D->template hasAttr<UsedAttr>())
1667 return;
1668
1669 // Must have internal linkage and an ordinary name.
Rafael Espindola181e3ec2013-05-13 00:12:11 +00001670 if (!D->getIdentifier() || D->getFormalLinkage() != InternalLinkage)
Richard Smith00249372013-04-06 05:00:46 +00001671 return;
1672
1673 // Must be in an extern "C" context. Entities declared directly within
1674 // a record are not extern "C" even if the record is in such a context.
Rafael Espindolad8ffd0b2013-05-05 20:15:21 +00001675 const SomeDecl *First = D->getFirstDeclaration();
1676 if (First->getDeclContext()->isRecord() || !First->isInExternCContext())
Richard Smith00249372013-04-06 05:00:46 +00001677 return;
1678
1679 // OK, this is an internal linkage entity inside an extern "C" linkage
1680 // specification. Make a note of that so we can give it the "expected"
1681 // mangled name if nothing else is using that name.
Richard Smith67972042013-04-06 07:07:44 +00001682 std::pair<StaticExternCMap::iterator, bool> R =
1683 StaticExternCValues.insert(std::make_pair(D->getIdentifier(), GV));
Richard Smith00249372013-04-06 05:00:46 +00001684
1685 // If we have multiple internal linkage entities with the same name
1686 // in extern "C" regions, none of them gets that name.
Richard Smith67972042013-04-06 07:07:44 +00001687 if (!R.second)
1688 R.first->second = 0;
Richard Smith00249372013-04-06 05:00:46 +00001689}
1690
Daniel Dunbarbd012ff2008-07-29 23:18:29 +00001691void CodeGenModule::EmitGlobalVarDefinition(const VarDecl *D) {
Chris Lattner8f32f712007-07-14 00:23:28 +00001692 llvm::Constant *Init = 0;
Eli Friedman77ba7082008-05-30 19:50:47 +00001693 QualType ASTTy = D->getType();
Richard Smith7ca48502012-02-13 22:16:19 +00001694 CXXRecordDecl *RD = ASTTy->getBaseElementTypeUnsafe()->getAsCXXRecordDecl();
1695 bool NeedsGlobalCtor = false;
1696 bool NeedsGlobalDtor = RD && !RD->hasTrivialDestructor();
Mike Stump1eb44332009-09-09 15:08:12 +00001697
Richard Smith2d6a5672012-01-14 04:30:29 +00001698 const VarDecl *InitDecl;
1699 const Expr *InitExpr = D->getAnyInitializer(InitDecl);
Sebastian Redl19b1a6e2012-02-25 20:51:20 +00001700
Anders Carlsson3bb92692010-01-26 17:43:42 +00001701 if (!InitExpr) {
Eli Friedmancd5f4aa2008-05-30 20:39:54 +00001702 // This is a tentative definition; tentative definitions are
Daniel Dunbar03f5ad92009-04-15 22:08:45 +00001703 // implicitly initialized with { 0 }.
1704 //
1705 // Note that tentative definitions are only emitted at the end of
1706 // a translation unit, so they should never have incomplete
1707 // type. In addition, EmitTentativeDefinition makes sure that we
1708 // never attempt to emit a tentative definition if a real one
1709 // exists. A use may still exists, however, so we still may need
1710 // to do a RAUW.
1711 assert(!ASTTy->isIncompleteType() && "Unexpected incomplete type");
Anders Carlssonb0d0ea02009-08-02 21:18:22 +00001712 Init = EmitNullConstant(D->getType());
Eli Friedman77ba7082008-05-30 19:50:47 +00001713 } else {
Richard Smith7c3e6152013-06-12 22:31:48 +00001714 initializedGlobalDecl = GlobalDecl(D);
1715 Init = EmitConstantInit(*InitDecl);
Sebastian Redl19b1a6e2012-02-25 20:51:20 +00001716
Fariborz Jahanian4904bf42012-06-26 16:06:38 +00001717 if (!Init) {
Anders Carlsson3bb92692010-01-26 17:43:42 +00001718 QualType T = InitExpr->getType();
Douglas Gregorc446d182010-05-05 20:15:55 +00001719 if (D->getType()->isReferenceType())
1720 T = D->getType();
Richard Smith2d6a5672012-01-14 04:30:29 +00001721
David Blaikie4e4d0842012-03-11 07:00:24 +00001722 if (getLangOpts().CPlusPlus) {
Anders Carlsson89ed31d2009-08-08 23:24:23 +00001723 Init = EmitNullConstant(T);
Richard Smith7ca48502012-02-13 22:16:19 +00001724 NeedsGlobalCtor = true;
Anders Carlsson89ed31d2009-08-08 23:24:23 +00001725 } else {
1726 ErrorUnsupported(D, "static initializer");
1727 Init = llvm::UndefValue::get(getTypes().ConvertType(T));
1728 }
John McCallbf40cb52010-07-15 23:40:35 +00001729 } else {
1730 // We don't need an initializer, so remove the entry for the delayed
Richard Smith7ca48502012-02-13 22:16:19 +00001731 // initializer position (just in case this entry was delayed) if we
1732 // also don't need to register a destructor.
David Blaikie4e4d0842012-03-11 07:00:24 +00001733 if (getLangOpts().CPlusPlus && !NeedsGlobalDtor)
John McCallbf40cb52010-07-15 23:40:35 +00001734 DelayedCXXInitPosition.erase(D);
Eli Friedman6e656f42009-02-20 01:18:21 +00001735 }
Eli Friedman77ba7082008-05-30 19:50:47 +00001736 }
Eli Friedman77ba7082008-05-30 19:50:47 +00001737
Chris Lattner2acc6e32011-07-18 04:24:23 +00001738 llvm::Type* InitType = Init->getType();
Chris Lattner570585c2009-03-21 09:16:30 +00001739 llvm::Constant *Entry = GetAddrOfGlobalVar(D, InitType);
Mike Stump1eb44332009-09-09 15:08:12 +00001740
Chris Lattner570585c2009-03-21 09:16:30 +00001741 // Strip off a bitcast if we got one back.
1742 if (llvm::ConstantExpr *CE = dyn_cast<llvm::ConstantExpr>(Entry)) {
Chris Lattner9d4a15f2009-07-16 16:48:25 +00001743 assert(CE->getOpcode() == llvm::Instruction::BitCast ||
1744 // all zero index gep.
1745 CE->getOpcode() == llvm::Instruction::GetElementPtr);
Chris Lattner570585c2009-03-21 09:16:30 +00001746 Entry = CE->getOperand(0);
1747 }
Mike Stump1eb44332009-09-09 15:08:12 +00001748
Chris Lattner570585c2009-03-21 09:16:30 +00001749 // Entry is now either a Function or GlobalVariable.
1750 llvm::GlobalVariable *GV = dyn_cast<llvm::GlobalVariable>(Entry);
Mike Stump1eb44332009-09-09 15:08:12 +00001751
Chris Lattner570585c2009-03-21 09:16:30 +00001752 // We have a definition after a declaration with the wrong type.
1753 // We must make a new GlobalVariable* and update everything that used OldGV
1754 // (a declaration or tentative definition) with the new GlobalVariable*
1755 // (which will be a definition).
1756 //
1757 // This happens if there is a prototype for a global (e.g.
1758 // "extern int x[];") and then a definition of a different type (e.g.
1759 // "int x[10];"). This also happens when an initializer has a different type
1760 // from the type of the global (this happens with unions).
Chris Lattner570585c2009-03-21 09:16:30 +00001761 if (GV == 0 ||
1762 GV->getType()->getElementType() != InitType ||
Peter Collingbourne207f4d82011-03-18 22:38:29 +00001763 GV->getType()->getAddressSpace() !=
Peter Collingbourne4dc34eb2012-05-20 21:08:35 +00001764 GetGlobalVarAddressSpace(D, getContext().getTargetAddressSpace(ASTTy))) {
Mike Stump1eb44332009-09-09 15:08:12 +00001765
John McCallf746aa62010-03-19 23:29:14 +00001766 // Move the old entry aside so that we'll create a new one.
Chris Lattner5f9e2722011-07-23 10:55:15 +00001767 Entry->setName(StringRef());
Daniel Dunbar232350d2009-02-19 05:36:41 +00001768
Chris Lattner570585c2009-03-21 09:16:30 +00001769 // Make a new global with the correct type, this is now guaranteed to work.
1770 GV = cast<llvm::GlobalVariable>(GetAddrOfGlobalVar(D, InitType));
Chris Lattner0558e792009-03-21 09:25:43 +00001771
Eli Friedman77ba7082008-05-30 19:50:47 +00001772 // Replace all uses of the old global with the new global
Mike Stump1eb44332009-09-09 15:08:12 +00001773 llvm::Constant *NewPtrForOldDecl =
Owen Anderson3c4972d2009-07-29 18:54:39 +00001774 llvm::ConstantExpr::getBitCast(GV, Entry->getType());
Chris Lattner570585c2009-03-21 09:16:30 +00001775 Entry->replaceAllUsesWith(NewPtrForOldDecl);
Eli Friedman77ba7082008-05-30 19:50:47 +00001776
1777 // Erase the old global, since it is no longer used.
Chris Lattner570585c2009-03-21 09:16:30 +00001778 cast<llvm::GlobalValue>(Entry)->eraseFromParent();
Chris Lattner8f32f712007-07-14 00:23:28 +00001779 }
Devang Patel8e53e722007-10-26 16:31:40 +00001780
Richard Smith00249372013-04-06 05:00:46 +00001781 MaybeHandleStaticInExternC(D, GV);
1782
Julien Lerouge77f68bb2011-09-09 22:41:49 +00001783 if (D->hasAttr<AnnotateAttr>())
1784 AddGlobalAnnotations(D, GV);
Nate Begeman8bd4afe2008-04-19 04:17:09 +00001785
Chris Lattner88a69ad2007-07-13 05:13:43 +00001786 GV->setInitializer(Init);
Chris Lattnere78b86f2009-08-05 05:20:29 +00001787
1788 // If it is safe to mark the global 'constant', do so now.
Richard Smitha9b21d22012-02-17 06:48:11 +00001789 GV->setConstant(!NeedsGlobalCtor && !NeedsGlobalDtor &&
1790 isTypeConstant(D->getType(), true));
Mike Stump1eb44332009-09-09 15:08:12 +00001791
Ken Dyck8b752f12010-01-27 17:10:57 +00001792 GV->setAlignment(getContext().getDeclAlign(D).getQuantity());
Richard Smitha9b21d22012-02-17 06:48:11 +00001793
Chris Lattner88a69ad2007-07-13 05:13:43 +00001794 // Set the llvm linkage type as appropriate.
Fariborz Jahanian354e7122010-10-27 16:21:54 +00001795 llvm::GlobalValue::LinkageTypes Linkage =
Eli Friedman07369dd2013-07-01 20:22:57 +00001796 GetLLVMLinkageVarDefinition(D, GV->isConstant());
Fariborz Jahanian354e7122010-10-27 16:21:54 +00001797 GV->setLinkage(Linkage);
1798 if (Linkage == llvm::GlobalVariable::CommonLinkage)
Chris Lattnere78b86f2009-08-05 05:20:29 +00001799 // common vars aren't constant even if declared const.
1800 GV->setConstant(false);
Daniel Dunbar7e714cd2009-04-10 20:26:50 +00001801
Daniel Dunbar7c65e992009-04-14 08:05:55 +00001802 SetCommonAttributes(D, GV);
Daniel Dunbar04d40782009-04-14 06:00:08 +00001803
John McCall3030eb82010-11-06 09:44:32 +00001804 // Emit the initializer function if necessary.
Richard Smith7ca48502012-02-13 22:16:19 +00001805 if (NeedsGlobalCtor || NeedsGlobalDtor)
1806 EmitCXXGlobalVarDeclInitFunc(D, GV, NeedsGlobalCtor);
John McCall3030eb82010-11-06 09:44:32 +00001807
Kostya Serebryany05c5ebc2012-08-21 06:53:28 +00001808 // If we are compiling with ASan, add metadata indicating dynamically
1809 // initialized globals.
Will Dietz4f45bc02013-01-18 11:30:38 +00001810 if (SanOpts.Address && NeedsGlobalCtor) {
Kostya Serebryany05c5ebc2012-08-21 06:53:28 +00001811 llvm::Module &M = getModule();
1812
1813 llvm::NamedMDNode *DynamicInitializers =
1814 M.getOrInsertNamedMetadata("llvm.asan.dynamically_initialized_globals");
1815 llvm::Value *GlobalToAdd[] = { GV };
1816 llvm::MDNode *ThisGlobal = llvm::MDNode::get(VMContext, GlobalToAdd);
1817 DynamicInitializers->addOperand(ThisGlobal);
1818 }
1819
Sanjiv Gupta686226b2008-06-05 08:59:10 +00001820 // Emit global variable debug information.
Eric Christopher73fb3502011-10-13 21:45:18 +00001821 if (CGDebugInfo *DI = getModuleDebugInfo())
Douglas Gregor4cdad312012-10-23 20:05:01 +00001822 if (getCodeGenOpts().getDebugInfo() >= CodeGenOptions::LimitedDebugInfo)
Alexey Samsonovfd00eec2012-05-04 07:39:27 +00001823 DI->EmitGlobalVariable(GV, D);
Chris Lattner88a69ad2007-07-13 05:13:43 +00001824}
Reid Spencer5f016e22007-07-11 17:01:13 +00001825
Fariborz Jahanian354e7122010-10-27 16:21:54 +00001826llvm::GlobalValue::LinkageTypes
Eli Friedman07369dd2013-07-01 20:22:57 +00001827CodeGenModule::GetLLVMLinkageVarDefinition(const VarDecl *D, bool isConstant) {
Fariborz Jahanian354e7122010-10-27 16:21:54 +00001828 GVALinkage Linkage = getContext().GetGVALinkageForVariable(D);
1829 if (Linkage == GVA_Internal)
1830 return llvm::Function::InternalLinkage;
1831 else if (D->hasAttr<DLLImportAttr>())
1832 return llvm::Function::DLLImportLinkage;
1833 else if (D->hasAttr<DLLExportAttr>())
1834 return llvm::Function::DLLExportLinkage;
Reid Klecknera7225342013-05-20 14:02:37 +00001835 else if (D->hasAttr<SelectAnyAttr>()) {
1836 // selectany symbols are externally visible, so use weak instead of
1837 // linkonce. MSVC optimizes away references to const selectany globals, so
1838 // all definitions should be the same and ODR linkage should be used.
1839 // http://msdn.microsoft.com/en-us/library/5tkz6s71.aspx
1840 return llvm::GlobalVariable::WeakODRLinkage;
1841 } else if (D->hasAttr<WeakAttr>()) {
Eli Friedman07369dd2013-07-01 20:22:57 +00001842 if (isConstant)
Fariborz Jahanian354e7122010-10-27 16:21:54 +00001843 return llvm::GlobalVariable::WeakODRLinkage;
1844 else
1845 return llvm::GlobalVariable::WeakAnyLinkage;
1846 } else if (Linkage == GVA_TemplateInstantiation ||
1847 Linkage == GVA_ExplicitTemplateInstantiation)
John McCall99ace162011-04-12 01:46:54 +00001848 return llvm::GlobalVariable::WeakODRLinkage;
David Blaikie4e4d0842012-03-11 07:00:24 +00001849 else if (!getLangOpts().CPlusPlus &&
Eric Christophera6cf1e72010-12-02 02:45:55 +00001850 ((!CodeGenOpts.NoCommon && !D->getAttr<NoCommonAttr>()) ||
1851 D->getAttr<CommonAttr>()) &&
Fariborz Jahanian354e7122010-10-27 16:21:54 +00001852 !D->hasExternalStorage() && !D->getInit() &&
Richard Smith38afbc72013-04-13 02:43:54 +00001853 !D->getAttr<SectionAttr>() && !D->getTLSKind() &&
Fariborz Jahanianab27d6e2011-06-20 17:50:03 +00001854 !D->getAttr<WeakImportAttr>()) {
Fariborz Jahanian354e7122010-10-27 16:21:54 +00001855 // Thread local vars aren't considered common linkage.
1856 return llvm::GlobalVariable::CommonLinkage;
Bill Wendling4e3b54b2013-05-02 19:18:03 +00001857 } else if (D->getTLSKind() == VarDecl::TLS_Dynamic &&
1858 getTarget().getTriple().isMacOSX())
1859 // On Darwin, the backing variable for a C++11 thread_local variable always
1860 // has internal linkage; all accesses should just be calls to the
1861 // Itanium-specified entry point, which has the normal linkage of the
1862 // variable.
1863 return llvm::GlobalValue::InternalLinkage;
Fariborz Jahanian354e7122010-10-27 16:21:54 +00001864 return llvm::GlobalVariable::ExternalLinkage;
1865}
1866
John McCalla923c972012-12-12 22:21:47 +00001867/// Replace the uses of a function that was declared with a non-proto type.
1868/// We want to silently drop extra arguments from call sites
1869static void replaceUsesOfNonProtoConstant(llvm::Constant *old,
1870 llvm::Function *newFn) {
1871 // Fast path.
1872 if (old->use_empty()) return;
1873
1874 llvm::Type *newRetTy = newFn->getReturnType();
1875 SmallVector<llvm::Value*, 4> newArgs;
1876
1877 for (llvm::Value::use_iterator ui = old->use_begin(), ue = old->use_end();
1878 ui != ue; ) {
1879 llvm::Value::use_iterator use = ui++; // Increment before the use is erased.
1880 llvm::User *user = *use;
1881
1882 // Recognize and replace uses of bitcasts. Most calls to
1883 // unprototyped functions will use bitcasts.
1884 if (llvm::ConstantExpr *bitcast = dyn_cast<llvm::ConstantExpr>(user)) {
1885 if (bitcast->getOpcode() == llvm::Instruction::BitCast)
1886 replaceUsesOfNonProtoConstant(bitcast, newFn);
1887 continue;
1888 }
1889
1890 // Recognize calls to the function.
1891 llvm::CallSite callSite(user);
1892 if (!callSite) continue;
1893 if (!callSite.isCallee(use)) continue;
1894
1895 // If the return types don't match exactly, then we can't
1896 // transform this call unless it's dead.
1897 if (callSite->getType() != newRetTy && !callSite->use_empty())
1898 continue;
1899
1900 // Get the call site's attribute list.
Bill Wendlingb263bdf2013-01-27 02:46:53 +00001901 SmallVector<llvm::AttributeSet, 8> newAttrs;
John McCalla923c972012-12-12 22:21:47 +00001902 llvm::AttributeSet oldAttrs = callSite.getAttributes();
1903
1904 // Collect any return attributes from the call.
Bill Wendlinga37ce612013-01-21 21:57:40 +00001905 if (oldAttrs.hasAttributes(llvm::AttributeSet::ReturnIndex))
Bill Wendlinged01f842013-01-21 22:45:00 +00001906 newAttrs.push_back(
Bill Wendlingb263bdf2013-01-27 02:46:53 +00001907 llvm::AttributeSet::get(newFn->getContext(),
1908 oldAttrs.getRetAttributes()));
John McCalla923c972012-12-12 22:21:47 +00001909
1910 // If the function was passed too few arguments, don't transform.
1911 unsigned newNumArgs = newFn->arg_size();
1912 if (callSite.arg_size() < newNumArgs) continue;
1913
1914 // If extra arguments were passed, we silently drop them.
1915 // If any of the types mismatch, we don't transform.
1916 unsigned argNo = 0;
1917 bool dontTransform = false;
1918 for (llvm::Function::arg_iterator ai = newFn->arg_begin(),
1919 ae = newFn->arg_end(); ai != ae; ++ai, ++argNo) {
1920 if (callSite.getArgument(argNo)->getType() != ai->getType()) {
1921 dontTransform = true;
1922 break;
1923 }
1924
1925 // Add any parameter attributes.
Bill Wendling89530e42013-01-23 06:15:10 +00001926 if (oldAttrs.hasAttributes(argNo + 1))
1927 newAttrs.
Bill Wendlingb263bdf2013-01-27 02:46:53 +00001928 push_back(llvm::
1929 AttributeSet::get(newFn->getContext(),
1930 oldAttrs.getParamAttributes(argNo + 1)));
John McCalla923c972012-12-12 22:21:47 +00001931 }
1932 if (dontTransform)
1933 continue;
1934
Bill Wendlinge67e4c92013-01-18 21:26:07 +00001935 if (oldAttrs.hasAttributes(llvm::AttributeSet::FunctionIndex))
Bill Wendlingb263bdf2013-01-27 02:46:53 +00001936 newAttrs.push_back(llvm::AttributeSet::get(newFn->getContext(),
1937 oldAttrs.getFnAttributes()));
John McCalla923c972012-12-12 22:21:47 +00001938
1939 // Okay, we can transform this. Create the new call instruction and copy
1940 // over the required information.
1941 newArgs.append(callSite.arg_begin(), callSite.arg_begin() + argNo);
1942
1943 llvm::CallSite newCall;
1944 if (callSite.isCall()) {
1945 newCall = llvm::CallInst::Create(newFn, newArgs, "",
1946 callSite.getInstruction());
1947 } else {
1948 llvm::InvokeInst *oldInvoke =
1949 cast<llvm::InvokeInst>(callSite.getInstruction());
1950 newCall = llvm::InvokeInst::Create(newFn,
1951 oldInvoke->getNormalDest(),
1952 oldInvoke->getUnwindDest(),
1953 newArgs, "",
1954 callSite.getInstruction());
1955 }
1956 newArgs.clear(); // for the next iteration
1957
1958 if (!newCall->getType()->isVoidTy())
1959 newCall->takeName(callSite.getInstruction());
1960 newCall.setAttributes(
1961 llvm::AttributeSet::get(newFn->getContext(), newAttrs));
1962 newCall.setCallingConv(callSite.getCallingConv());
1963
1964 // Finally, remove the old call, replacing any uses with the new one.
1965 if (!callSite->use_empty())
1966 callSite->replaceAllUsesWith(newCall.getInstruction());
1967
1968 // Copy debug location attached to CI.
1969 if (!callSite->getDebugLoc().isUnknown())
1970 newCall->setDebugLoc(callSite->getDebugLoc());
1971 callSite->eraseFromParent();
1972 }
1973}
1974
Chris Lattnerbdb01322009-05-05 06:16:31 +00001975/// ReplaceUsesOfNonProtoTypeWithRealFunction - This function is called when we
1976/// implement a function with no prototype, e.g. "int foo() {}". If there are
1977/// existing call uses of the old function in the module, this adjusts them to
1978/// call the new function directly.
1979///
1980/// This is not just a cleanup: the always_inline pass requires direct calls to
1981/// functions to be able to inline them. If there is a bitcast in the way, it
1982/// won't inline them. Instcombine normally deletes these calls, but it isn't
1983/// run at -O0.
1984static void ReplaceUsesOfNonProtoTypeWithRealFunction(llvm::GlobalValue *Old,
1985 llvm::Function *NewFn) {
1986 // If we're redefining a global as a function, don't transform it.
John McCalla923c972012-12-12 22:21:47 +00001987 if (!isa<llvm::Function>(Old)) return;
Mike Stump1eb44332009-09-09 15:08:12 +00001988
John McCalla923c972012-12-12 22:21:47 +00001989 replaceUsesOfNonProtoConstant(Old, NewFn);
Chris Lattnerbdb01322009-05-05 06:16:31 +00001990}
1991
Rafael Espindola02503932012-03-08 15:51:03 +00001992void CodeGenModule::HandleCXXStaticMemberVarInstantiation(VarDecl *VD) {
1993 TemplateSpecializationKind TSK = VD->getTemplateSpecializationKind();
1994 // If we have a definition, this might be a deferred decl. If the
1995 // instantiation is explicit, make sure we emit it at the end.
1996 if (VD->getDefinition() && TSK == TSK_ExplicitInstantiationDefinition)
1997 GetAddrOfGlobalVar(VD);
Argyrios Kyrtzidisafda9052013-02-24 00:05:01 +00001998
1999 EmitTopLevelDecl(VD);
Rafael Espindola234fe652012-03-05 10:54:55 +00002000}
Daniel Dunbarbd012ff2008-07-29 23:18:29 +00002001
Chris Lattnerb4880ba2009-05-12 21:21:08 +00002002void CodeGenModule::EmitGlobalFunctionDefinition(GlobalDecl GD) {
Chris Lattnerb4880ba2009-05-12 21:21:08 +00002003 const FunctionDecl *D = cast<FunctionDecl>(GD.getDecl());
John McCalld26bc762011-03-09 04:27:21 +00002004
John McCall1f6f9612011-03-09 08:12:35 +00002005 // Compute the function info and LLVM type.
John McCallde5d3c72012-02-17 03:33:10 +00002006 const CGFunctionInfo &FI = getTypes().arrangeGlobalDeclaration(GD);
2007 llvm::FunctionType *Ty = getTypes().GetFunctionType(FI);
John McCalld26bc762011-03-09 04:27:21 +00002008
Chris Lattner9fa959d2009-05-12 20:58:15 +00002009 // Get or create the prototype for the function.
Chris Lattnerb4880ba2009-05-12 21:21:08 +00002010 llvm::Constant *Entry = GetAddrOfFunction(GD, Ty);
Mike Stump1eb44332009-09-09 15:08:12 +00002011
Chris Lattner0558e792009-03-21 09:25:43 +00002012 // Strip off a bitcast if we got one back.
2013 if (llvm::ConstantExpr *CE = dyn_cast<llvm::ConstantExpr>(Entry)) {
2014 assert(CE->getOpcode() == llvm::Instruction::BitCast);
2015 Entry = CE->getOperand(0);
2016 }
Mike Stump1eb44332009-09-09 15:08:12 +00002017
2018
Chris Lattner0558e792009-03-21 09:25:43 +00002019 if (cast<llvm::GlobalValue>(Entry)->getType()->getElementType() != Ty) {
Chris Lattnerbdb01322009-05-05 06:16:31 +00002020 llvm::GlobalValue *OldFn = cast<llvm::GlobalValue>(Entry);
Mike Stump1eb44332009-09-09 15:08:12 +00002021
Daniel Dunbar42745812009-03-09 23:53:08 +00002022 // If the types mismatch then we have to rewrite the definition.
Chris Lattnerbdb01322009-05-05 06:16:31 +00002023 assert(OldFn->isDeclaration() &&
Chris Lattner0558e792009-03-21 09:25:43 +00002024 "Shouldn't replace non-declaration");
Chris Lattner34809502009-03-21 08:53:37 +00002025
Chris Lattner62b33ea2009-03-21 08:38:50 +00002026 // F is the Function* for the one with the wrong type, we must make a new
2027 // Function* and update everything that used F (a declaration) with the new
2028 // Function* (which will be a definition).
2029 //
2030 // This happens if there is a prototype for a function
2031 // (e.g. "int f()") and then a definition of a different type
John McCallf746aa62010-03-19 23:29:14 +00002032 // (e.g. "int f(int x)"). Move the old function aside so that it
2033 // doesn't interfere with GetAddrOfFunction.
Chris Lattner5f9e2722011-07-23 10:55:15 +00002034 OldFn->setName(StringRef());
Chris Lattnerb4880ba2009-05-12 21:21:08 +00002035 llvm::Function *NewFn = cast<llvm::Function>(GetAddrOfFunction(GD, Ty));
Mike Stump1eb44332009-09-09 15:08:12 +00002036
John McCalla923c972012-12-12 22:21:47 +00002037 // This might be an implementation of a function without a
2038 // prototype, in which case, try to do special replacement of
2039 // calls which match the new prototype. The really key thing here
2040 // is that we also potentially drop arguments from the call site
2041 // so as to make a direct call, which makes the inliner happier
2042 // and suppresses a number of optimizer warnings (!) about
2043 // dropping arguments.
2044 if (!OldFn->use_empty()) {
Chris Lattnerbdb01322009-05-05 06:16:31 +00002045 ReplaceUsesOfNonProtoTypeWithRealFunction(OldFn, NewFn);
Chris Lattner9fa959d2009-05-12 20:58:15 +00002046 OldFn->removeDeadConstantUsers();
2047 }
Mike Stump1eb44332009-09-09 15:08:12 +00002048
Chris Lattner62b33ea2009-03-21 08:38:50 +00002049 // Replace uses of F with the Function we will endow with a body.
Chris Lattnerbdb01322009-05-05 06:16:31 +00002050 if (!Entry->use_empty()) {
Mike Stump1eb44332009-09-09 15:08:12 +00002051 llvm::Constant *NewPtrForOldDecl =
Owen Anderson3c4972d2009-07-29 18:54:39 +00002052 llvm::ConstantExpr::getBitCast(NewFn, Entry->getType());
Chris Lattnerbdb01322009-05-05 06:16:31 +00002053 Entry->replaceAllUsesWith(NewPtrForOldDecl);
2054 }
Mike Stump1eb44332009-09-09 15:08:12 +00002055
Chris Lattner62b33ea2009-03-21 08:38:50 +00002056 // Ok, delete the old function now, which is dead.
Chris Lattnerbdb01322009-05-05 06:16:31 +00002057 OldFn->eraseFromParent();
Mike Stump1eb44332009-09-09 15:08:12 +00002058
Chris Lattner0558e792009-03-21 09:25:43 +00002059 Entry = NewFn;
Daniel Dunbarbd012ff2008-07-29 23:18:29 +00002060 }
Mike Stump1eb44332009-09-09 15:08:12 +00002061
John McCall112c9672010-11-02 21:04:24 +00002062 // We need to set linkage and visibility on the function before
2063 // generating code for it because various parts of IR generation
2064 // want to propagate this information down (e.g. to local static
2065 // declarations).
Chris Lattner0558e792009-03-21 09:25:43 +00002066 llvm::Function *Fn = cast<llvm::Function>(Entry);
Peter Collingbourne144a31f2013-06-05 17:49:37 +00002067 setFunctionLinkage(GD, Fn);
Daniel Dunbarbd012ff2008-07-29 23:18:29 +00002068
John McCall112c9672010-11-02 21:04:24 +00002069 // FIXME: this is redundant with part of SetFunctionDefinitionAttributes
Anders Carlsson0ffeaad2011-01-29 19:39:23 +00002070 setGlobalVisibility(Fn, D);
John McCall112c9672010-11-02 21:04:24 +00002071
Richard Smith00249372013-04-06 05:00:46 +00002072 MaybeHandleStaticInExternC(D, Fn);
2073
John McCalld26bc762011-03-09 04:27:21 +00002074 CodeGenFunction(*this).GenerateCode(D, Fn, FI);
Daniel Dunbar6bfed7e2008-08-01 00:01:51 +00002075
Daniel Dunbar7c65e992009-04-14 08:05:55 +00002076 SetFunctionDefinitionAttributes(D, Fn);
2077 SetLLVMFunctionAttributesForDefinition(D, Fn);
Mike Stump1eb44332009-09-09 15:08:12 +00002078
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +00002079 if (const ConstructorAttr *CA = D->getAttr<ConstructorAttr>())
Daniel Dunbar219df662008-09-08 23:44:31 +00002080 AddGlobalCtor(Fn, CA->getPriority());
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +00002081 if (const DestructorAttr *DA = D->getAttr<DestructorAttr>())
Daniel Dunbar219df662008-09-08 23:44:31 +00002082 AddGlobalDtor(Fn, DA->getPriority());
Julien Lerouge77f68bb2011-09-09 22:41:49 +00002083 if (D->hasAttr<AnnotateAttr>())
2084 AddGlobalAnnotations(D, Fn);
Daniel Dunbarbd012ff2008-07-29 23:18:29 +00002085}
2086
John McCallf746aa62010-03-19 23:29:14 +00002087void CodeGenModule::EmitAliasDefinition(GlobalDecl GD) {
2088 const ValueDecl *D = cast<ValueDecl>(GD.getDecl());
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +00002089 const AliasAttr *AA = D->getAttr<AliasAttr>();
Chris Lattnerbd532712009-03-22 21:47:11 +00002090 assert(AA && "Not an alias?");
2091
Chris Lattner5f9e2722011-07-23 10:55:15 +00002092 StringRef MangledName = getMangledName(GD);
Mike Stump1eb44332009-09-09 15:08:12 +00002093
John McCallf746aa62010-03-19 23:29:14 +00002094 // If there is a definition in the module, then it wins over the alias.
2095 // This is dubious, but allow it to be safe. Just ignore the alias.
2096 llvm::GlobalValue *Entry = GetGlobalValue(MangledName);
2097 if (Entry && !Entry->isDeclaration())
2098 return;
2099
Chris Lattner2acc6e32011-07-18 04:24:23 +00002100 llvm::Type *DeclTy = getTypes().ConvertTypeForMem(D->getType());
Chris Lattnerbd532712009-03-22 21:47:11 +00002101
2102 // Create a reference to the named value. This ensures that it is emitted
2103 // if a deferred decl.
2104 llvm::Constant *Aliasee;
2105 if (isa<llvm::FunctionType>(DeclTy))
Alex Rosenbergc857ce82012-10-05 23:12:53 +00002106 Aliasee = GetOrCreateLLVMFunction(AA->getAliasee(), DeclTy, GD,
Anders Carlsson1faa89f2011-02-05 04:35:53 +00002107 /*ForVTable=*/false);
Chris Lattnerbd532712009-03-22 21:47:11 +00002108 else
John McCallf746aa62010-03-19 23:29:14 +00002109 Aliasee = GetOrCreateLLVMGlobal(AA->getAliasee(),
Owen Anderson96e0fc72009-07-29 22:16:19 +00002110 llvm::PointerType::getUnqual(DeclTy), 0);
Chris Lattnerbd532712009-03-22 21:47:11 +00002111
2112 // Create the new alias itself, but don't set a name yet.
Mike Stump1eb44332009-09-09 15:08:12 +00002113 llvm::GlobalValue *GA =
Chris Lattnerbd532712009-03-22 21:47:11 +00002114 new llvm::GlobalAlias(Aliasee->getType(),
2115 llvm::Function::ExternalLinkage,
2116 "", Aliasee, &getModule());
Mike Stump1eb44332009-09-09 15:08:12 +00002117
Chris Lattnerbd532712009-03-22 21:47:11 +00002118 if (Entry) {
John McCallf746aa62010-03-19 23:29:14 +00002119 assert(Entry->isDeclaration());
2120
Chris Lattnerbd532712009-03-22 21:47:11 +00002121 // If there is a declaration in the module, then we had an extern followed
2122 // by the alias, as in:
2123 // extern int test6();
2124 // ...
2125 // int test6() __attribute__((alias("test7")));
2126 //
2127 // Remove it and replace uses of it with the alias.
John McCallf746aa62010-03-19 23:29:14 +00002128 GA->takeName(Entry);
Mike Stump1eb44332009-09-09 15:08:12 +00002129
Owen Anderson3c4972d2009-07-29 18:54:39 +00002130 Entry->replaceAllUsesWith(llvm::ConstantExpr::getBitCast(GA,
Chris Lattnerbd532712009-03-22 21:47:11 +00002131 Entry->getType()));
Chris Lattnerbd532712009-03-22 21:47:11 +00002132 Entry->eraseFromParent();
John McCallf746aa62010-03-19 23:29:14 +00002133 } else {
Anders Carlsson9a20d552010-06-22 16:16:50 +00002134 GA->setName(MangledName);
Chris Lattnerbd532712009-03-22 21:47:11 +00002135 }
Mike Stump1eb44332009-09-09 15:08:12 +00002136
Daniel Dunbar7c65e992009-04-14 08:05:55 +00002137 // Set attributes which are particular to an alias; this is a
2138 // specialization of the attributes which may be set on a global
2139 // variable/function.
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +00002140 if (D->hasAttr<DLLExportAttr>()) {
Daniel Dunbar7c65e992009-04-14 08:05:55 +00002141 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
2142 // The dllexport attribute is ignored for undefined symbols.
Argyrios Kyrtzidis06a54a32010-07-07 11:31:19 +00002143 if (FD->hasBody())
Daniel Dunbar7c65e992009-04-14 08:05:55 +00002144 GA->setLinkage(llvm::Function::DLLExportLinkage);
2145 } else {
2146 GA->setLinkage(llvm::Function::DLLExportLinkage);
2147 }
Mike Stump1eb44332009-09-09 15:08:12 +00002148 } else if (D->hasAttr<WeakAttr>() ||
Rafael Espindola11e8ce72010-02-23 22:00:30 +00002149 D->hasAttr<WeakRefAttr>() ||
Douglas Gregor0a0d2b12011-03-23 00:50:03 +00002150 D->isWeakImported()) {
Daniel Dunbar7c65e992009-04-14 08:05:55 +00002151 GA->setLinkage(llvm::Function::WeakAnyLinkage);
2152 }
2153
2154 SetCommonAttributes(D, GA);
Chris Lattnerbd532712009-03-22 21:47:11 +00002155}
2156
Benjamin Kramer8dd55a32011-07-14 17:45:50 +00002157llvm::Function *CodeGenModule::getIntrinsic(unsigned IID,
Chris Lattner2d3ba4f2011-07-23 17:14:25 +00002158 ArrayRef<llvm::Type*> Tys) {
Jay Foaddf983a82011-07-12 14:06:48 +00002159 return llvm::Intrinsic::getDeclaration(&getModule(), (llvm::Intrinsic::ID)IID,
Benjamin Kramer8dd55a32011-07-14 17:45:50 +00002160 Tys);
Chris Lattner7acda7c2007-12-18 00:25:38 +00002161}
Chris Lattnerbef20ac2007-08-31 04:31:45 +00002162
Daniel Dunbar1d552912009-07-23 22:52:48 +00002163static llvm::StringMapEntry<llvm::Constant*> &
2164GetConstantCFStringEntry(llvm::StringMap<llvm::Constant*> &Map,
2165 const StringLiteral *Literal,
Daniel Dunbar70ee9752009-07-23 23:41:22 +00002166 bool TargetIsLSB,
Daniel Dunbar1d552912009-07-23 22:52:48 +00002167 bool &IsUTF16,
2168 unsigned &StringLength) {
Chris Lattner5f9e2722011-07-23 10:55:15 +00002169 StringRef String = Literal->getString();
Benjamin Kramer2f4eaef2010-08-17 12:54:38 +00002170 unsigned NumBytes = String.size();
Daniel Dunbar1d552912009-07-23 22:52:48 +00002171
Daniel Dunbarf015b032009-09-22 10:03:52 +00002172 // Check for simple case.
2173 if (!Literal->containsNonAsciiOrNull()) {
2174 StringLength = NumBytes;
Benjamin Kramer2f4eaef2010-08-17 12:54:38 +00002175 return Map.GetOrCreateValue(String);
Daniel Dunbarf015b032009-09-22 10:03:52 +00002176 }
2177
Bill Wendling84392d02012-03-30 00:26:17 +00002178 // Otherwise, convert the UTF8 literals into a string of shorts.
2179 IsUTF16 = true;
2180
2181 SmallVector<UTF16, 128> ToBuf(NumBytes + 1); // +1 for ending nulls.
Roman Divacky31ba6132012-09-06 15:59:27 +00002182 const UTF8 *FromPtr = (const UTF8 *)String.data();
Daniel Dunbar1d552912009-07-23 22:52:48 +00002183 UTF16 *ToPtr = &ToBuf[0];
Mike Stump1eb44332009-09-09 15:08:12 +00002184
Fariborz Jahaniane7ddfb92010-09-07 19:57:04 +00002185 (void)ConvertUTF8toUTF16(&FromPtr, FromPtr + NumBytes,
2186 &ToPtr, ToPtr + NumBytes,
2187 strictConversion);
Mike Stump1eb44332009-09-09 15:08:12 +00002188
Daniel Dunbar70ee9752009-07-23 23:41:22 +00002189 // ConvertUTF8toUTF16 returns the length in ToPtr.
Daniel Dunbar1d552912009-07-23 22:52:48 +00002190 StringLength = ToPtr - &ToBuf[0];
Daniel Dunbar70ee9752009-07-23 23:41:22 +00002191
Bill Wendling84392d02012-03-30 00:26:17 +00002192 // Add an explicit null.
2193 *ToPtr = 0;
2194 return Map.
2195 GetOrCreateValue(StringRef(reinterpret_cast<const char *>(ToBuf.data()),
2196 (StringLength + 1) * 2));
Daniel Dunbar1d552912009-07-23 22:52:48 +00002197}
2198
Fariborz Jahaniancf8e1682011-05-13 18:13:10 +00002199static llvm::StringMapEntry<llvm::Constant*> &
2200GetConstantStringEntry(llvm::StringMap<llvm::Constant*> &Map,
Bill Wendling8322c232012-03-29 22:12:09 +00002201 const StringLiteral *Literal,
2202 unsigned &StringLength) {
2203 StringRef String = Literal->getString();
2204 StringLength = String.size();
2205 return Map.GetOrCreateValue(String);
Fariborz Jahaniancf8e1682011-05-13 18:13:10 +00002206}
2207
Daniel Dunbar1d552912009-07-23 22:52:48 +00002208llvm::Constant *
2209CodeGenModule::GetAddrOfConstantCFString(const StringLiteral *Literal) {
2210 unsigned StringLength = 0;
2211 bool isUTF16 = false;
2212 llvm::StringMapEntry<llvm::Constant*> &Entry =
Mike Stump1eb44332009-09-09 15:08:12 +00002213 GetConstantCFStringEntry(CFConstantStringMap, Literal,
Micah Villmow25a6a842012-10-08 16:25:52 +00002214 getDataLayout().isLittleEndian(),
Daniel Dunbar70ee9752009-07-23 23:41:22 +00002215 isUTF16, StringLength);
Mike Stump1eb44332009-09-09 15:08:12 +00002216
Daniel Dunbar1d552912009-07-23 22:52:48 +00002217 if (llvm::Constant *C = Entry.getValue())
2218 return C;
Mike Stump1eb44332009-09-09 15:08:12 +00002219
Chris Lattner8b418682012-02-07 00:39:47 +00002220 llvm::Constant *Zero = llvm::Constant::getNullValue(Int32Ty);
Daniel Dunbar3e9df992008-08-23 18:37:06 +00002221 llvm::Constant *Zeros[] = { Zero, Zero };
Fariborz Jahanian428edb72013-04-16 15:25:39 +00002222 llvm::Value *V;
2223
Chris Lattner9d4a15f2009-07-16 16:48:25 +00002224 // If we don't already have it, get __CFConstantStringClassReference.
Anders Carlssonc9e20912007-08-21 00:21:21 +00002225 if (!CFConstantStringClassRef) {
Chris Lattner2acc6e32011-07-18 04:24:23 +00002226 llvm::Type *Ty = getTypes().ConvertType(getContext().IntTy);
Owen Anderson96e0fc72009-07-29 22:16:19 +00002227 Ty = llvm::ArrayType::get(Ty, 0);
Mike Stump1eb44332009-09-09 15:08:12 +00002228 llvm::Constant *GV = CreateRuntimeVariable(Ty,
Chris Lattner9d4a15f2009-07-16 16:48:25 +00002229 "__CFConstantStringClassReference");
Daniel Dunbar3e9df992008-08-23 18:37:06 +00002230 // Decay array -> ptr
Fariborz Jahanian428edb72013-04-16 15:25:39 +00002231 V = llvm::ConstantExpr::getGetElementPtr(GV, Zeros);
2232 CFConstantStringClassRef = V;
Anders Carlssonc9e20912007-08-21 00:21:21 +00002233 }
Fariborz Jahanian428edb72013-04-16 15:25:39 +00002234 else
2235 V = CFConstantStringClassRef;
Mike Stump1eb44332009-09-09 15:08:12 +00002236
Anders Carlssone3daa762008-11-15 18:54:24 +00002237 QualType CFTy = getContext().getCFConstantStringType();
Daniel Dunbar3e9df992008-08-23 18:37:06 +00002238
Chris Lattner2acc6e32011-07-18 04:24:23 +00002239 llvm::StructType *STy =
Anders Carlssone3daa762008-11-15 18:54:24 +00002240 cast<llvm::StructType>(getTypes().ConvertType(CFTy));
2241
Benjamin Kramer1d236ab2011-10-15 12:20:02 +00002242 llvm::Constant *Fields[4];
Douglas Gregor44b43212008-12-11 16:49:14 +00002243
Anders Carlssonc9e20912007-08-21 00:21:21 +00002244 // Class pointer.
Fariborz Jahanian428edb72013-04-16 15:25:39 +00002245 Fields[0] = cast<llvm::ConstantExpr>(V);
Mike Stump1eb44332009-09-09 15:08:12 +00002246
Anders Carlssonc9e20912007-08-21 00:21:21 +00002247 // Flags.
Chris Lattner2acc6e32011-07-18 04:24:23 +00002248 llvm::Type *Ty = getTypes().ConvertType(getContext().UnsignedIntTy);
Mike Stump1eb44332009-09-09 15:08:12 +00002249 Fields[1] = isUTF16 ? llvm::ConstantInt::get(Ty, 0x07d0) :
Anders Carlsson5add6832009-08-16 05:55:31 +00002250 llvm::ConstantInt::get(Ty, 0x07C8);
2251
Anders Carlssonc9e20912007-08-21 00:21:21 +00002252 // String pointer.
Bill Wendling84392d02012-03-30 00:26:17 +00002253 llvm::Constant *C = 0;
2254 if (isUTF16) {
2255 ArrayRef<uint16_t> Arr =
David Greene5ba58a12013-01-15 22:09:41 +00002256 llvm::makeArrayRef<uint16_t>(reinterpret_cast<uint16_t*>(
2257 const_cast<char *>(Entry.getKey().data())),
Bill Wendling84392d02012-03-30 00:26:17 +00002258 Entry.getKey().size() / 2);
2259 C = llvm::ConstantDataArray::get(VMContext, Arr);
2260 } else {
2261 C = llvm::ConstantDataArray::getString(VMContext, Entry.getKey());
2262 }
Daniel Dunbara9668e02009-04-03 00:57:44 +00002263
Chris Lattner95b851e2009-07-16 05:03:48 +00002264 llvm::GlobalValue::LinkageTypes Linkage;
Bill Wendling1bf7a3f2012-01-10 08:46:39 +00002265 if (isUTF16)
Chris Lattner278b9f02009-10-14 05:55:45 +00002266 // FIXME: why do utf strings get "_" labels instead of "L" labels?
Chris Lattner95b851e2009-07-16 05:03:48 +00002267 Linkage = llvm::GlobalValue::InternalLinkage;
Bill Wendling1bf7a3f2012-01-10 08:46:39 +00002268 else
Rafael Espindola584acf22011-03-14 17:55:00 +00002269 // FIXME: With OS X ld 123.2 (xcode 4) and LTO we would get a linker error
2270 // when using private linkage. It is not clear if this is a bug in ld
2271 // or a reasonable new restriction.
Rafael Espindoladc0f1372011-03-14 21:08:19 +00002272 Linkage = llvm::GlobalValue::LinkerPrivateLinkage;
Chris Lattner278b9f02009-10-14 05:55:45 +00002273
Bill Wendling1bf7a3f2012-01-10 08:46:39 +00002274 // Note: -fwritable-strings doesn't make the backing store strings of
2275 // CFStrings writable. (See <rdar://problem/10657500>)
Mike Stump1eb44332009-09-09 15:08:12 +00002276 llvm::GlobalVariable *GV =
Bill Wendling1bf7a3f2012-01-10 08:46:39 +00002277 new llvm::GlobalVariable(getModule(), C->getType(), /*isConstant=*/true,
2278 Linkage, C, ".str");
Rafael Espindolab266a1f2011-01-17 16:31:00 +00002279 GV->setUnnamedAddr(true);
Ulrich Weigand6b203512013-05-06 16:23:57 +00002280 // Don't enforce the target's minimum global alignment, since the only use
2281 // of the string is via this class initializer.
Daniel Dunbara9668e02009-04-03 00:57:44 +00002282 if (isUTF16) {
Ken Dyck4da244c2010-01-26 18:46:23 +00002283 CharUnits Align = getContext().getTypeAlignInChars(getContext().ShortTy);
2284 GV->setAlignment(Align.getQuantity());
Daniel Dunbarf7e903d2011-04-12 23:30:52 +00002285 } else {
2286 CharUnits Align = getContext().getTypeAlignInChars(getContext().CharTy);
2287 GV->setAlignment(Align.getQuantity());
Daniel Dunbara9668e02009-04-03 00:57:44 +00002288 }
Bill Wendling84392d02012-03-30 00:26:17 +00002289
2290 // String.
Jay Foada5c04342011-07-21 14:31:17 +00002291 Fields[2] = llvm::ConstantExpr::getGetElementPtr(GV, Zeros);
Anders Carlsson5add6832009-08-16 05:55:31 +00002292
Bill Wendling84392d02012-03-30 00:26:17 +00002293 if (isUTF16)
2294 // Cast the UTF16 string to the correct type.
2295 Fields[2] = llvm::ConstantExpr::getBitCast(Fields[2], Int8PtrTy);
2296
Anders Carlssonc9e20912007-08-21 00:21:21 +00002297 // String length.
2298 Ty = getTypes().ConvertType(getContext().LongTy);
Anders Carlsson5add6832009-08-16 05:55:31 +00002299 Fields[3] = llvm::ConstantInt::get(Ty, StringLength);
Mike Stump1eb44332009-09-09 15:08:12 +00002300
Anders Carlssonc9e20912007-08-21 00:21:21 +00002301 // The struct.
Owen Anderson08e25242009-07-27 22:29:56 +00002302 C = llvm::ConstantStruct::get(STy, Fields);
Mike Stump1eb44332009-09-09 15:08:12 +00002303 GV = new llvm::GlobalVariable(getModule(), C->getType(), true,
2304 llvm::GlobalVariable::PrivateLinkage, C,
Chris Lattner95b851e2009-07-16 05:03:48 +00002305 "_unnamed_cfstring_");
John McCall64aa4b32013-04-16 22:48:15 +00002306 if (const char *Sect = getTarget().getCFStringSection())
Daniel Dunbar8e5c2b82009-03-31 23:42:16 +00002307 GV->setSection(Sect);
Daniel Dunbar1d552912009-07-23 22:52:48 +00002308 Entry.setValue(GV);
Mike Stump1eb44332009-09-09 15:08:12 +00002309
Anders Carlsson0c678292007-11-01 00:41:52 +00002310 return GV;
Anders Carlssonc9e20912007-08-21 00:21:21 +00002311}
Chris Lattner45e8cbd2007-11-28 05:34:05 +00002312
Douglas Gregor45c4ea72011-08-09 15:54:21 +00002313static RecordDecl *
2314CreateRecordDecl(const ASTContext &Ctx, RecordDecl::TagKind TK,
2315 DeclContext *DC, IdentifierInfo *Id) {
2316 SourceLocation Loc;
David Blaikie4e4d0842012-03-11 07:00:24 +00002317 if (Ctx.getLangOpts().CPlusPlus)
Douglas Gregor45c4ea72011-08-09 15:54:21 +00002318 return CXXRecordDecl::Create(Ctx, TK, DC, Loc, Loc, Id);
2319 else
2320 return RecordDecl::Create(Ctx, TK, DC, Loc, Loc, Id);
2321}
2322
Fariborz Jahanian33e982b2010-04-22 20:26:39 +00002323llvm::Constant *
Fariborz Jahanian4c733072010-10-19 17:19:29 +00002324CodeGenModule::GetAddrOfConstantString(const StringLiteral *Literal) {
Fariborz Jahanian2bb5dda2010-04-23 17:41:07 +00002325 unsigned StringLength = 0;
Fariborz Jahanian2bb5dda2010-04-23 17:41:07 +00002326 llvm::StringMapEntry<llvm::Constant*> &Entry =
Fariborz Jahaniancf8e1682011-05-13 18:13:10 +00002327 GetConstantStringEntry(CFConstantStringMap, Literal, StringLength);
Fariborz Jahanian2bb5dda2010-04-23 17:41:07 +00002328
2329 if (llvm::Constant *C = Entry.getValue())
2330 return C;
2331
Chris Lattner812234b2012-02-06 22:47:00 +00002332 llvm::Constant *Zero = llvm::Constant::getNullValue(Int32Ty);
Fariborz Jahanian2bb5dda2010-04-23 17:41:07 +00002333 llvm::Constant *Zeros[] = { Zero, Zero };
Fariborz Jahanian428edb72013-04-16 15:25:39 +00002334 llvm::Value *V;
Fariborz Jahanianec951e02010-04-23 22:33:39 +00002335 // If we don't already have it, get _NSConstantStringClassReference.
Fariborz Jahanian4c733072010-10-19 17:19:29 +00002336 if (!ConstantStringClassRef) {
David Blaikie4e4d0842012-03-11 07:00:24 +00002337 std::string StringClass(getLangOpts().ObjCConstantStringClass);
Chris Lattner2acc6e32011-07-18 04:24:23 +00002338 llvm::Type *Ty = getTypes().ConvertType(getContext().IntTy);
Fariborz Jahanian4c733072010-10-19 17:19:29 +00002339 llvm::Constant *GV;
John McCall260611a2012-06-20 06:18:46 +00002340 if (LangOpts.ObjCRuntime.isNonFragile()) {
Fariborz Jahanian25dba5d2011-05-17 22:46:11 +00002341 std::string str =
2342 StringClass.empty() ? "OBJC_CLASS_$_NSConstantString"
2343 : "OBJC_CLASS_$_" + StringClass;
Fariborz Jahanian6f40e222011-05-17 22:21:16 +00002344 GV = getObjCRuntime().GetClassGlobal(str);
2345 // Make sure the result is of the correct type.
Chris Lattner2acc6e32011-07-18 04:24:23 +00002346 llvm::Type *PTy = llvm::PointerType::getUnqual(Ty);
Fariborz Jahanian428edb72013-04-16 15:25:39 +00002347 V = llvm::ConstantExpr::getBitCast(GV, PTy);
2348 ConstantStringClassRef = V;
Fariborz Jahanian6f40e222011-05-17 22:21:16 +00002349 } else {
Fariborz Jahanian25dba5d2011-05-17 22:46:11 +00002350 std::string str =
2351 StringClass.empty() ? "_NSConstantStringClassReference"
2352 : "_" + StringClass + "ClassReference";
Chris Lattner2acc6e32011-07-18 04:24:23 +00002353 llvm::Type *PTy = llvm::ArrayType::get(Ty, 0);
Fariborz Jahanian25dba5d2011-05-17 22:46:11 +00002354 GV = CreateRuntimeVariable(PTy, str);
Fariborz Jahanian6f40e222011-05-17 22:21:16 +00002355 // Decay array -> ptr
Fariborz Jahanian428edb72013-04-16 15:25:39 +00002356 V = llvm::ConstantExpr::getGetElementPtr(GV, Zeros);
2357 ConstantStringClassRef = V;
Fariborz Jahanian4c733072010-10-19 17:19:29 +00002358 }
Fariborz Jahanian2bb5dda2010-04-23 17:41:07 +00002359 }
Fariborz Jahanian428edb72013-04-16 15:25:39 +00002360 else
2361 V = ConstantStringClassRef;
Douglas Gregor45c4ea72011-08-09 15:54:21 +00002362
2363 if (!NSConstantStringType) {
2364 // Construct the type for a constant NSString.
2365 RecordDecl *D = CreateRecordDecl(Context, TTK_Struct,
2366 Context.getTranslationUnitDecl(),
2367 &Context.Idents.get("__builtin_NSString"));
2368 D->startDefinition();
2369
2370 QualType FieldTypes[3];
2371
2372 // const int *isa;
2373 FieldTypes[0] = Context.getPointerType(Context.IntTy.withConst());
2374 // const char *str;
2375 FieldTypes[1] = Context.getPointerType(Context.CharTy.withConst());
2376 // unsigned int length;
2377 FieldTypes[2] = Context.UnsignedIntTy;
2378
2379 // Create fields
2380 for (unsigned i = 0; i < 3; ++i) {
2381 FieldDecl *Field = FieldDecl::Create(Context, D,
2382 SourceLocation(),
2383 SourceLocation(), 0,
2384 FieldTypes[i], /*TInfo=*/0,
2385 /*BitWidth=*/0,
2386 /*Mutable=*/false,
Richard Smithca523302012-06-10 03:12:00 +00002387 ICIS_NoInit);
Douglas Gregor45c4ea72011-08-09 15:54:21 +00002388 Field->setAccess(AS_public);
2389 D->addDecl(Field);
2390 }
2391
2392 D->completeDefinition();
2393 QualType NSTy = Context.getTagDeclType(D);
2394 NSConstantStringType = cast<llvm::StructType>(getTypes().ConvertType(NSTy));
2395 }
Fariborz Jahanian2bb5dda2010-04-23 17:41:07 +00002396
Benjamin Kramer1d236ab2011-10-15 12:20:02 +00002397 llvm::Constant *Fields[3];
Fariborz Jahanian2bb5dda2010-04-23 17:41:07 +00002398
2399 // Class pointer.
Fariborz Jahanian428edb72013-04-16 15:25:39 +00002400 Fields[0] = cast<llvm::ConstantExpr>(V);
Fariborz Jahanian2bb5dda2010-04-23 17:41:07 +00002401
2402 // String pointer.
Chris Lattner94010692012-02-05 02:30:40 +00002403 llvm::Constant *C =
2404 llvm::ConstantDataArray::getString(VMContext, Entry.getKey());
Fariborz Jahanian2bb5dda2010-04-23 17:41:07 +00002405
2406 llvm::GlobalValue::LinkageTypes Linkage;
2407 bool isConstant;
Fariborz Jahaniancf8e1682011-05-13 18:13:10 +00002408 Linkage = llvm::GlobalValue::PrivateLinkage;
David Blaikie4e4d0842012-03-11 07:00:24 +00002409 isConstant = !LangOpts.WritableStrings;
Fariborz Jahanian2bb5dda2010-04-23 17:41:07 +00002410
2411 llvm::GlobalVariable *GV =
2412 new llvm::GlobalVariable(getModule(), C->getType(), isConstant, Linkage, C,
2413 ".str");
Rafael Espindola803d3072011-01-17 22:11:21 +00002414 GV->setUnnamedAddr(true);
Ulrich Weigand6b203512013-05-06 16:23:57 +00002415 // Don't enforce the target's minimum global alignment, since the only use
2416 // of the string is via this class initializer.
Fariborz Jahaniancf8e1682011-05-13 18:13:10 +00002417 CharUnits Align = getContext().getTypeAlignInChars(getContext().CharTy);
2418 GV->setAlignment(Align.getQuantity());
Jay Foada5c04342011-07-21 14:31:17 +00002419 Fields[1] = llvm::ConstantExpr::getGetElementPtr(GV, Zeros);
Fariborz Jahanian2bb5dda2010-04-23 17:41:07 +00002420
2421 // String length.
Chris Lattner2acc6e32011-07-18 04:24:23 +00002422 llvm::Type *Ty = getTypes().ConvertType(getContext().UnsignedIntTy);
Fariborz Jahanian2bb5dda2010-04-23 17:41:07 +00002423 Fields[2] = llvm::ConstantInt::get(Ty, StringLength);
2424
2425 // The struct.
Douglas Gregor45c4ea72011-08-09 15:54:21 +00002426 C = llvm::ConstantStruct::get(NSConstantStringType, Fields);
Fariborz Jahanian2bb5dda2010-04-23 17:41:07 +00002427 GV = new llvm::GlobalVariable(getModule(), C->getType(), true,
2428 llvm::GlobalVariable::PrivateLinkage, C,
2429 "_unnamed_nsstring_");
2430 // FIXME. Fix section.
Fariborz Jahanianec951e02010-04-23 22:33:39 +00002431 if (const char *Sect =
John McCall260611a2012-06-20 06:18:46 +00002432 LangOpts.ObjCRuntime.isNonFragile()
John McCall64aa4b32013-04-16 22:48:15 +00002433 ? getTarget().getNSStringNonFragileABISection()
2434 : getTarget().getNSStringSection())
Fariborz Jahanian2bb5dda2010-04-23 17:41:07 +00002435 GV->setSection(Sect);
2436 Entry.setValue(GV);
2437
2438 return GV;
Fariborz Jahanian33e982b2010-04-22 20:26:39 +00002439}
2440
Douglas Gregor0815b572011-08-09 17:23:49 +00002441QualType CodeGenModule::getObjCFastEnumerationStateType() {
2442 if (ObjCFastEnumerationStateType.isNull()) {
2443 RecordDecl *D = CreateRecordDecl(Context, TTK_Struct,
2444 Context.getTranslationUnitDecl(),
2445 &Context.Idents.get("__objcFastEnumerationState"));
2446 D->startDefinition();
2447
2448 QualType FieldTypes[] = {
2449 Context.UnsignedLongTy,
2450 Context.getPointerType(Context.getObjCIdType()),
2451 Context.getPointerType(Context.UnsignedLongTy),
2452 Context.getConstantArrayType(Context.UnsignedLongTy,
2453 llvm::APInt(32, 5), ArrayType::Normal, 0)
2454 };
2455
2456 for (size_t i = 0; i < 4; ++i) {
2457 FieldDecl *Field = FieldDecl::Create(Context,
2458 D,
2459 SourceLocation(),
2460 SourceLocation(), 0,
2461 FieldTypes[i], /*TInfo=*/0,
2462 /*BitWidth=*/0,
2463 /*Mutable=*/false,
Richard Smithca523302012-06-10 03:12:00 +00002464 ICIS_NoInit);
Douglas Gregor0815b572011-08-09 17:23:49 +00002465 Field->setAccess(AS_public);
2466 D->addDecl(Field);
2467 }
2468
2469 D->completeDefinition();
2470 ObjCFastEnumerationStateType = Context.getTagDeclType(D);
2471 }
2472
2473 return ObjCFastEnumerationStateType;
2474}
2475
Eli Friedman64f45a22011-11-01 02:23:42 +00002476llvm::Constant *
2477CodeGenModule::GetConstantArrayFromStringLiteral(const StringLiteral *E) {
2478 assert(!E->getType()->isPointerType() && "Strings are always arrays");
2479
2480 // Don't emit it as the address of the string, emit the string data itself
2481 // as an inline array.
Chris Lattner812234b2012-02-06 22:47:00 +00002482 if (E->getCharByteWidth() == 1) {
2483 SmallString<64> Str(E->getString());
2484
2485 // Resize the string to the right size, which is indicated by its type.
2486 const ConstantArrayType *CAT = Context.getAsConstantArrayType(E->getType());
2487 Str.resize(CAT->getSize().getZExtValue());
2488 return llvm::ConstantDataArray::getString(VMContext, Str, false);
2489 }
Chris Lattner94010692012-02-05 02:30:40 +00002490
2491 llvm::ArrayType *AType =
2492 cast<llvm::ArrayType>(getTypes().ConvertType(E->getType()));
2493 llvm::Type *ElemTy = AType->getElementType();
2494 unsigned NumElements = AType->getNumElements();
Chris Lattnerd79ed432012-02-06 22:52:04 +00002495
2496 // Wide strings have either 2-byte or 4-byte elements.
2497 if (ElemTy->getPrimitiveSizeInBits() == 16) {
2498 SmallVector<uint16_t, 32> Elements;
2499 Elements.reserve(NumElements);
2500
2501 for(unsigned i = 0, e = E->getLength(); i != e; ++i)
2502 Elements.push_back(E->getCodeUnit(i));
2503 Elements.resize(NumElements);
2504 return llvm::ConstantDataArray::get(VMContext, Elements);
Chris Lattner94010692012-02-05 02:30:40 +00002505 }
2506
Chris Lattnerd79ed432012-02-06 22:52:04 +00002507 assert(ElemTy->getPrimitiveSizeInBits() == 32);
2508 SmallVector<uint32_t, 32> Elements;
2509 Elements.reserve(NumElements);
2510
2511 for(unsigned i = 0, e = E->getLength(); i != e; ++i)
2512 Elements.push_back(E->getCodeUnit(i));
2513 Elements.resize(NumElements);
2514 return llvm::ConstantDataArray::get(VMContext, Elements);
Eli Friedman64f45a22011-11-01 02:23:42 +00002515}
2516
Daniel Dunbar61432932008-08-13 23:20:05 +00002517/// GetAddrOfConstantStringFromLiteral - Return a pointer to a
2518/// constant array for the given string literal.
2519llvm::Constant *
2520CodeGenModule::GetAddrOfConstantStringFromLiteral(const StringLiteral *S) {
Ulrich Weigand6b203512013-05-06 16:23:57 +00002521 CharUnits Align = getContext().getAlignOfGlobalVarInChars(S->getType());
Eli Friedman64f45a22011-11-01 02:23:42 +00002522 if (S->isAscii() || S->isUTF8()) {
Chris Lattner812234b2012-02-06 22:47:00 +00002523 SmallString<64> Str(S->getString());
2524
2525 // Resize the string to the right size, which is indicated by its type.
2526 const ConstantArrayType *CAT = Context.getAsConstantArrayType(S->getType());
2527 Str.resize(CAT->getSize().getZExtValue());
2528 return GetAddrOfConstantString(Str, /*GlobalName*/ 0, Align.getQuantity());
Eli Friedman7eb79c12009-11-16 05:55:46 +00002529 }
Eli Friedman64f45a22011-11-01 02:23:42 +00002530
Chris Lattner812234b2012-02-06 22:47:00 +00002531 // FIXME: the following does not memoize wide strings.
Eli Friedman64f45a22011-11-01 02:23:42 +00002532 llvm::Constant *C = GetConstantArrayFromStringLiteral(S);
2533 llvm::GlobalVariable *GV =
2534 new llvm::GlobalVariable(getModule(),C->getType(),
David Blaikie4e4d0842012-03-11 07:00:24 +00002535 !LangOpts.WritableStrings,
Eli Friedman64f45a22011-11-01 02:23:42 +00002536 llvm::GlobalValue::PrivateLinkage,
2537 C,".str");
Seth Cantrell7d6a7c02012-01-18 12:11:32 +00002538
Eli Friedman64f45a22011-11-01 02:23:42 +00002539 GV->setAlignment(Align.getQuantity());
2540 GV->setUnnamedAddr(true);
Eli Friedman64f45a22011-11-01 02:23:42 +00002541 return GV;
Daniel Dunbar61432932008-08-13 23:20:05 +00002542}
2543
Chris Lattnereaf2bb82009-02-24 22:18:39 +00002544/// GetAddrOfConstantStringFromObjCEncode - Return a pointer to a constant
2545/// array for the given ObjCEncodeExpr node.
2546llvm::Constant *
2547CodeGenModule::GetAddrOfConstantStringFromObjCEncode(const ObjCEncodeExpr *E) {
2548 std::string Str;
2549 getContext().getObjCEncodingForType(E->getEncodedType(), Str);
Eli Friedmana210f352009-03-07 20:17:55 +00002550
2551 return GetAddrOfConstantCString(Str);
Chris Lattnereaf2bb82009-02-24 22:18:39 +00002552}
2553
2554
Chris Lattnera7ad98f2008-02-11 00:02:17 +00002555/// GenerateWritableString -- Creates storage for a string literal.
John McCalla5e19c62011-08-04 01:03:22 +00002556static llvm::GlobalVariable *GenerateStringLiteral(StringRef str,
Chris Lattner45e8cbd2007-11-28 05:34:05 +00002557 bool constant,
Daniel Dunbar5fabf9d2008-10-17 21:56:50 +00002558 CodeGenModule &CGM,
John McCalla5e19c62011-08-04 01:03:22 +00002559 const char *GlobalName,
2560 unsigned Alignment) {
Daniel Dunbar61432932008-08-13 23:20:05 +00002561 // Create Constant for this string literal. Don't add a '\0'.
Owen Anderson0032b272009-08-13 21:57:51 +00002562 llvm::Constant *C =
Chris Lattner94010692012-02-05 02:30:40 +00002563 llvm::ConstantDataArray::getString(CGM.getLLVMContext(), str, false);
Mike Stump1eb44332009-09-09 15:08:12 +00002564
Chris Lattner45e8cbd2007-11-28 05:34:05 +00002565 // Create a global variable for this string
Rafael Espindola1257bc62011-01-10 22:34:03 +00002566 llvm::GlobalVariable *GV =
2567 new llvm::GlobalVariable(CGM.getModule(), C->getType(), constant,
2568 llvm::GlobalValue::PrivateLinkage,
2569 C, GlobalName);
John McCalla5e19c62011-08-04 01:03:22 +00002570 GV->setAlignment(Alignment);
Rafael Espindola1257bc62011-01-10 22:34:03 +00002571 GV->setUnnamedAddr(true);
2572 return GV;
Chris Lattner45e8cbd2007-11-28 05:34:05 +00002573}
2574
Daniel Dunbar61432932008-08-13 23:20:05 +00002575/// GetAddrOfConstantString - Returns a pointer to a character array
2576/// containing the literal. This contents are exactly that of the
2577/// given string, i.e. it will not be null terminated automatically;
2578/// see GetAddrOfConstantCString. Note that whether the result is
2579/// actually a pointer to an LLVM constant depends on
2580/// Feature.WriteableStrings.
2581///
2582/// The result has pointer to array type.
Chris Lattner5f9e2722011-07-23 10:55:15 +00002583llvm::Constant *CodeGenModule::GetAddrOfConstantString(StringRef Str,
John McCalla5e19c62011-08-04 01:03:22 +00002584 const char *GlobalName,
2585 unsigned Alignment) {
Daniel Dunbar8e5c2b82009-03-31 23:42:16 +00002586 // Get the default prefix if a name wasn't specified.
2587 if (!GlobalName)
Chris Lattner95b851e2009-07-16 05:03:48 +00002588 GlobalName = ".str";
Daniel Dunbar8e5c2b82009-03-31 23:42:16 +00002589
Ulrich Weigand6b203512013-05-06 16:23:57 +00002590 if (Alignment == 0)
2591 Alignment = getContext().getAlignOfGlobalVarInChars(getContext().CharTy)
2592 .getQuantity();
2593
Daniel Dunbar8e5c2b82009-03-31 23:42:16 +00002594 // Don't share any string literals if strings aren't constant.
David Blaikie4e4d0842012-03-11 07:00:24 +00002595 if (LangOpts.WritableStrings)
John McCalla5e19c62011-08-04 01:03:22 +00002596 return GenerateStringLiteral(Str, false, *this, GlobalName, Alignment);
Mike Stump1eb44332009-09-09 15:08:12 +00002597
John McCalla5e19c62011-08-04 01:03:22 +00002598 llvm::StringMapEntry<llvm::GlobalVariable *> &Entry =
Benjamin Kramer9de43422011-03-05 13:45:23 +00002599 ConstantStringMap.GetOrCreateValue(Str);
Chris Lattner45e8cbd2007-11-28 05:34:05 +00002600
John McCalla5e19c62011-08-04 01:03:22 +00002601 if (llvm::GlobalVariable *GV = Entry.getValue()) {
2602 if (Alignment > GV->getAlignment()) {
2603 GV->setAlignment(Alignment);
2604 }
2605 return GV;
2606 }
Chris Lattner45e8cbd2007-11-28 05:34:05 +00002607
2608 // Create a global variable for this.
Chris Lattner812234b2012-02-06 22:47:00 +00002609 llvm::GlobalVariable *GV = GenerateStringLiteral(Str, true, *this, GlobalName,
2610 Alignment);
John McCalla5e19c62011-08-04 01:03:22 +00002611 Entry.setValue(GV);
2612 return GV;
Chris Lattner45e8cbd2007-11-28 05:34:05 +00002613}
Daniel Dunbar61432932008-08-13 23:20:05 +00002614
2615/// GetAddrOfConstantCString - Returns a pointer to a character
Benjamin Kramer9de43422011-03-05 13:45:23 +00002616/// array containing the literal and a terminating '\0'
Daniel Dunbar61432932008-08-13 23:20:05 +00002617/// character. The result has pointer to array type.
Benjamin Kramer9de43422011-03-05 13:45:23 +00002618llvm::Constant *CodeGenModule::GetAddrOfConstantCString(const std::string &Str,
John McCalla5e19c62011-08-04 01:03:22 +00002619 const char *GlobalName,
2620 unsigned Alignment) {
Chris Lattner5f9e2722011-07-23 10:55:15 +00002621 StringRef StrWithNull(Str.c_str(), Str.size() + 1);
John McCalla5e19c62011-08-04 01:03:22 +00002622 return GetAddrOfConstantString(StrWithNull, GlobalName, Alignment);
Daniel Dunbar61432932008-08-13 23:20:05 +00002623}
Daniel Dunbar41071de2008-08-15 23:26:23 +00002624
Richard Smith211c8dd2013-06-05 00:46:14 +00002625llvm::Constant *CodeGenModule::GetAddrOfGlobalTemporary(
Richard Smith3282b842013-06-14 03:07:01 +00002626 const MaterializeTemporaryExpr *E, const Expr *Init) {
Richard Smith211c8dd2013-06-05 00:46:14 +00002627 assert((E->getStorageDuration() == SD_Static ||
2628 E->getStorageDuration() == SD_Thread) && "not a global temporary");
2629 const VarDecl *VD = cast<VarDecl>(E->getExtendingDecl());
2630
2631 // If we're not materializing a subobject of the temporary, keep the
2632 // cv-qualifiers from the type of the MaterializeTemporaryExpr.
Richard Smith3282b842013-06-14 03:07:01 +00002633 QualType MaterializedType = Init->getType();
2634 if (Init == E->GetTemporaryExpr())
2635 MaterializedType = E->getType();
Richard Smith211c8dd2013-06-05 00:46:14 +00002636
2637 llvm::Constant *&Slot = MaterializedGlobalTemporaryMap[E];
2638 if (Slot)
2639 return Slot;
2640
2641 // FIXME: If an externally-visible declaration extends multiple temporaries,
2642 // we need to give each temporary the same name in every translation unit (and
2643 // we also need to make the temporaries externally-visible).
2644 SmallString<256> Name;
2645 llvm::raw_svector_ostream Out(Name);
2646 getCXXABI().getMangleContext().mangleReferenceTemporary(VD, Out);
2647 Out.flush();
2648
Richard Smith211c8dd2013-06-05 00:46:14 +00002649 APValue *Value = 0;
2650 if (E->getStorageDuration() == SD_Static) {
Richard Smith3282b842013-06-14 03:07:01 +00002651 // We might have a cached constant initializer for this temporary. Note
2652 // that this might have a different value from the value computed by
2653 // evaluating the initializer if the surrounding constant expression
2654 // modifies the temporary.
Richard Smith211c8dd2013-06-05 00:46:14 +00002655 Value = getContext().getMaterializedTemporaryValue(E, false);
2656 if (Value && Value->isUninit())
2657 Value = 0;
2658 }
2659
Richard Smith3282b842013-06-14 03:07:01 +00002660 // Try evaluating it now, it might have a constant initializer.
2661 Expr::EvalResult EvalResult;
2662 if (!Value && Init->EvaluateAsRValue(EvalResult, getContext()) &&
2663 !EvalResult.hasSideEffects())
2664 Value = &EvalResult.Val;
2665
2666 llvm::Constant *InitialValue = 0;
2667 bool Constant = false;
2668 llvm::Type *Type;
Richard Smith211c8dd2013-06-05 00:46:14 +00002669 if (Value) {
2670 // The temporary has a constant initializer, use it.
Richard Smith3282b842013-06-14 03:07:01 +00002671 InitialValue = EmitConstantValue(*Value, MaterializedType, 0);
2672 Constant = isTypeConstant(MaterializedType, /*ExcludeCtor*/Value);
2673 Type = InitialValue->getType();
Richard Smith211c8dd2013-06-05 00:46:14 +00002674 } else {
Richard Smith3282b842013-06-14 03:07:01 +00002675 // No initializer, the initialization will be provided when we
Richard Smith211c8dd2013-06-05 00:46:14 +00002676 // initialize the declaration which performed lifetime extension.
Richard Smith3282b842013-06-14 03:07:01 +00002677 Type = getTypes().ConvertTypeForMem(MaterializedType);
Richard Smith211c8dd2013-06-05 00:46:14 +00002678 }
2679
2680 // Create a global variable for this lifetime-extended temporary.
2681 llvm::GlobalVariable *GV =
Richard Smith3282b842013-06-14 03:07:01 +00002682 new llvm::GlobalVariable(getModule(), Type, Constant,
2683 llvm::GlobalValue::PrivateLinkage,
2684 InitialValue, Name.c_str());
Richard Smith211c8dd2013-06-05 00:46:14 +00002685 GV->setAlignment(
Richard Smith3282b842013-06-14 03:07:01 +00002686 getContext().getTypeAlignInChars(MaterializedType).getQuantity());
Richard Smith211c8dd2013-06-05 00:46:14 +00002687 if (VD->getTLSKind())
2688 setTLSMode(GV, *VD);
2689 Slot = GV;
2690 return GV;
2691}
2692
Daniel Dunbaraf05bb92008-08-26 08:29:31 +00002693/// EmitObjCPropertyImplementations - Emit information for synthesized
2694/// properties for an implementation.
Mike Stump1eb44332009-09-09 15:08:12 +00002695void CodeGenModule::EmitObjCPropertyImplementations(const
Daniel Dunbaraf05bb92008-08-26 08:29:31 +00002696 ObjCImplementationDecl *D) {
Mike Stump1eb44332009-09-09 15:08:12 +00002697 for (ObjCImplementationDecl::propimpl_iterator
Argyrios Kyrtzidis17945a02009-06-30 02:36:12 +00002698 i = D->propimpl_begin(), e = D->propimpl_end(); i != e; ++i) {
David Blaikie581deb32012-06-06 20:45:41 +00002699 ObjCPropertyImplDecl *PID = *i;
Mike Stump1eb44332009-09-09 15:08:12 +00002700
Daniel Dunbaraf05bb92008-08-26 08:29:31 +00002701 // Dynamic is just for type-checking.
2702 if (PID->getPropertyImplementation() == ObjCPropertyImplDecl::Synthesize) {
2703 ObjCPropertyDecl *PD = PID->getPropertyDecl();
2704
2705 // Determine which methods need to be implemented, some may have
Jordan Rose1e4691b2012-10-10 16:42:25 +00002706 // been overridden. Note that ::isPropertyAccessor is not the method
Daniel Dunbaraf05bb92008-08-26 08:29:31 +00002707 // we want, that just indicates if the decl came from a
2708 // property. What we want to know is if the method is defined in
2709 // this implementation.
Argyrios Kyrtzidis17945a02009-06-30 02:36:12 +00002710 if (!D->getInstanceMethod(PD->getGetterName()))
Fariborz Jahanianfef30b52008-12-09 20:23:04 +00002711 CodeGenFunction(*this).GenerateObjCGetter(
2712 const_cast<ObjCImplementationDecl *>(D), PID);
Daniel Dunbaraf05bb92008-08-26 08:29:31 +00002713 if (!PD->isReadOnly() &&
Argyrios Kyrtzidis17945a02009-06-30 02:36:12 +00002714 !D->getInstanceMethod(PD->getSetterName()))
Fariborz Jahanianfef30b52008-12-09 20:23:04 +00002715 CodeGenFunction(*this).GenerateObjCSetter(
2716 const_cast<ObjCImplementationDecl *>(D), PID);
Daniel Dunbaraf05bb92008-08-26 08:29:31 +00002717 }
2718 }
2719}
2720
John McCalle81ac692011-03-22 07:05:39 +00002721static bool needsDestructMethod(ObjCImplementationDecl *impl) {
Jordy Rosedb8264e2011-07-22 02:08:32 +00002722 const ObjCInterfaceDecl *iface = impl->getClassInterface();
2723 for (const ObjCIvarDecl *ivar = iface->all_declared_ivar_begin();
John McCalle81ac692011-03-22 07:05:39 +00002724 ivar; ivar = ivar->getNextIvar())
2725 if (ivar->getType().isDestructedType())
2726 return true;
2727
2728 return false;
2729}
2730
Fariborz Jahanian109dfc62010-04-28 21:28:56 +00002731/// EmitObjCIvarInitializations - Emit information for ivar initialization
2732/// for an implementation.
2733void CodeGenModule::EmitObjCIvarInitializations(ObjCImplementationDecl *D) {
John McCalle81ac692011-03-22 07:05:39 +00002734 // We might need a .cxx_destruct even if we don't have any ivar initializers.
2735 if (needsDestructMethod(D)) {
2736 IdentifierInfo *II = &getContext().Idents.get(".cxx_destruct");
2737 Selector cxxSelector = getContext().Selectors.getSelector(0, &II);
2738 ObjCMethodDecl *DTORMethod =
2739 ObjCMethodDecl::Create(getContext(), D->getLocation(), D->getLocation(),
Argyrios Kyrtzidis75cf3e82011-08-17 19:25:08 +00002740 cxxSelector, getContext().VoidTy, 0, D,
2741 /*isInstance=*/true, /*isVariadic=*/false,
Jordan Rose1e4691b2012-10-10 16:42:25 +00002742 /*isPropertyAccessor=*/true, /*isImplicitlyDeclared=*/true,
Argyrios Kyrtzidis75cf3e82011-08-17 19:25:08 +00002743 /*isDefined=*/false, ObjCMethodDecl::Required);
John McCalle81ac692011-03-22 07:05:39 +00002744 D->addInstanceMethod(DTORMethod);
2745 CodeGenFunction(*this).GenerateObjCCtorDtorMethod(D, DTORMethod, false);
John McCallb03527a2012-10-17 04:53:31 +00002746 D->setHasDestructors(true);
John McCalle81ac692011-03-22 07:05:39 +00002747 }
2748
2749 // If the implementation doesn't have any ivar initializers, we don't need
2750 // a .cxx_construct.
David Chisnall827bbcc2011-03-17 14:19:08 +00002751 if (D->getNumIvarInitializers() == 0)
Fariborz Jahanian109dfc62010-04-28 21:28:56 +00002752 return;
Fariborz Jahanian109dfc62010-04-28 21:28:56 +00002753
John McCalle81ac692011-03-22 07:05:39 +00002754 IdentifierInfo *II = &getContext().Idents.get(".cxx_construct");
2755 Selector cxxSelector = getContext().Selectors.getSelector(0, &II);
Fariborz Jahanian109dfc62010-04-28 21:28:56 +00002756 // The constructor returns 'self'.
2757 ObjCMethodDecl *CTORMethod = ObjCMethodDecl::Create(getContext(),
2758 D->getLocation(),
Argyrios Kyrtzidis11d77162011-10-03 06:36:36 +00002759 D->getLocation(),
Argyrios Kyrtzidis11d77162011-10-03 06:36:36 +00002760 cxxSelector,
Fariborz Jahanian109dfc62010-04-28 21:28:56 +00002761 getContext().getObjCIdType(), 0,
Argyrios Kyrtzidis75cf3e82011-08-17 19:25:08 +00002762 D, /*isInstance=*/true,
2763 /*isVariadic=*/false,
Jordan Rose1e4691b2012-10-10 16:42:25 +00002764 /*isPropertyAccessor=*/true,
Argyrios Kyrtzidis75cf3e82011-08-17 19:25:08 +00002765 /*isImplicitlyDeclared=*/true,
2766 /*isDefined=*/false,
Fariborz Jahanian109dfc62010-04-28 21:28:56 +00002767 ObjCMethodDecl::Required);
2768 D->addInstanceMethod(CTORMethod);
2769 CodeGenFunction(*this).GenerateObjCCtorDtorMethod(D, CTORMethod, true);
John McCallb03527a2012-10-17 04:53:31 +00002770 D->setHasNonZeroConstructors(true);
Fariborz Jahanian109dfc62010-04-28 21:28:56 +00002771}
2772
Anders Carlsson91e20dd2009-04-02 05:55:18 +00002773/// EmitNamespace - Emit all declarations in a namespace.
Anders Carlsson984e0682009-04-01 00:58:25 +00002774void CodeGenModule::EmitNamespace(const NamespaceDecl *ND) {
Argyrios Kyrtzidis17945a02009-06-30 02:36:12 +00002775 for (RecordDecl::decl_iterator I = ND->decls_begin(), E = ND->decls_end();
Anders Carlsson984e0682009-04-01 00:58:25 +00002776 I != E; ++I)
2777 EmitTopLevelDecl(*I);
2778}
2779
Anders Carlsson91e20dd2009-04-02 05:55:18 +00002780// EmitLinkageSpec - Emit all declarations in a linkage spec.
2781void CodeGenModule::EmitLinkageSpec(const LinkageSpecDecl *LSD) {
Eli Friedmanf976be82009-08-01 20:48:04 +00002782 if (LSD->getLanguage() != LinkageSpecDecl::lang_c &&
2783 LSD->getLanguage() != LinkageSpecDecl::lang_cxx) {
Anders Carlsson91e20dd2009-04-02 05:55:18 +00002784 ErrorUnsupported(LSD, "linkage spec");
2785 return;
2786 }
2787
Argyrios Kyrtzidis17945a02009-06-30 02:36:12 +00002788 for (RecordDecl::decl_iterator I = LSD->decls_begin(), E = LSD->decls_end();
Fariborz Jahanianc1868e52012-10-26 20:22:11 +00002789 I != E; ++I) {
Fariborz Jahanian107dae42012-10-26 22:20:25 +00002790 // Meta-data for ObjC class includes references to implemented methods.
2791 // Generate class's method definitions first.
Fariborz Jahanianc1868e52012-10-26 20:22:11 +00002792 if (ObjCImplDecl *OID = dyn_cast<ObjCImplDecl>(*I)) {
2793 for (ObjCContainerDecl::method_iterator M = OID->meth_begin(),
2794 MEnd = OID->meth_end();
2795 M != MEnd; ++M)
2796 EmitTopLevelDecl(*M);
2797 }
Anders Carlsson91e20dd2009-04-02 05:55:18 +00002798 EmitTopLevelDecl(*I);
Fariborz Jahanianc1868e52012-10-26 20:22:11 +00002799 }
Anders Carlsson91e20dd2009-04-02 05:55:18 +00002800}
2801
Daniel Dunbar41071de2008-08-15 23:26:23 +00002802/// EmitTopLevelDecl - Emit code for a single top level declaration.
2803void CodeGenModule::EmitTopLevelDecl(Decl *D) {
2804 // If an error has occurred, stop code generation, but continue
2805 // parsing and semantic analysis (to ensure all warnings and errors
2806 // are emitted).
2807 if (Diags.hasErrorOccurred())
2808 return;
2809
Douglas Gregor16e8be22009-06-29 17:30:29 +00002810 // Ignore dependent declarations.
2811 if (D->getDeclContext() && D->getDeclContext()->isDependentContext())
2812 return;
Mike Stump1eb44332009-09-09 15:08:12 +00002813
Daniel Dunbar41071de2008-08-15 23:26:23 +00002814 switch (D->getKind()) {
Anders Carlsson293361a2009-08-25 13:14:46 +00002815 case Decl::CXXConversion:
Anders Carlsson2b77ba82009-04-04 20:47:02 +00002816 case Decl::CXXMethod:
Daniel Dunbar41071de2008-08-15 23:26:23 +00002817 case Decl::Function:
Douglas Gregor16e8be22009-06-29 17:30:29 +00002818 // Skip function templates
Francois Pichet8387e2a2011-04-22 22:18:13 +00002819 if (cast<FunctionDecl>(D)->getDescribedFunctionTemplate() ||
2820 cast<FunctionDecl>(D)->isLateTemplateParsed())
Douglas Gregor16e8be22009-06-29 17:30:29 +00002821 return;
Mike Stump1eb44332009-09-09 15:08:12 +00002822
Anders Carlsson555b4bb2009-09-10 23:43:36 +00002823 EmitGlobal(cast<FunctionDecl>(D));
2824 break;
2825
Daniel Dunbar41071de2008-08-15 23:26:23 +00002826 case Decl::Var:
Anders Carlsson555b4bb2009-09-10 23:43:36 +00002827 EmitGlobal(cast<VarDecl>(D));
Daniel Dunbar41071de2008-08-15 23:26:23 +00002828 break;
2829
John McCall26fbc722011-04-12 01:01:22 +00002830 // Indirect fields from global anonymous structs and unions can be
2831 // ignored; only the actual variable requires IR gen support.
2832 case Decl::IndirectField:
2833 break;
2834
Anders Carlsson95d4e5d2009-04-15 15:55:24 +00002835 // C++ Decls
Daniel Dunbar41071de2008-08-15 23:26:23 +00002836 case Decl::Namespace:
Anders Carlsson984e0682009-04-01 00:58:25 +00002837 EmitNamespace(cast<NamespaceDecl>(D));
Daniel Dunbar41071de2008-08-15 23:26:23 +00002838 break;
Douglas Gregor9cfbe482009-06-20 00:51:54 +00002839 // No code generation needed.
John McCall9d0c6612009-11-17 09:33:40 +00002840 case Decl::UsingShadow:
Douglas Gregor9cfbe482009-06-20 00:51:54 +00002841 case Decl::Using:
Douglas Gregor127102b2009-06-29 20:59:39 +00002842 case Decl::ClassTemplate:
2843 case Decl::FunctionTemplate:
Richard Smith3e4c6c42011-05-05 21:57:07 +00002844 case Decl::TypeAliasTemplate:
Douglas Gregor6a576ab2011-06-05 05:04:23 +00002845 case Decl::Block:
Michael Han684aa732013-02-22 17:15:32 +00002846 case Decl::Empty:
Douglas Gregor9cfbe482009-06-20 00:51:54 +00002847 break;
David Blaikiefc46ebc2013-05-20 22:50:41 +00002848 case Decl::NamespaceAlias:
2849 if (CGDebugInfo *DI = getModuleDebugInfo())
2850 DI->EmitNamespaceAlias(cast<NamespaceAliasDecl>(*D));
2851 return;
David Blaikie1601a4a2013-04-26 05:41:06 +00002852 case Decl::UsingDirective: // using namespace X; [C++]
2853 if (CGDebugInfo *DI = getModuleDebugInfo())
2854 DI->EmitUsingDirective(cast<UsingDirectiveDecl>(*D));
2855 return;
Anders Carlsson95d4e5d2009-04-15 15:55:24 +00002856 case Decl::CXXConstructor:
Anders Carlsson1fe598c2009-11-24 05:16:24 +00002857 // Skip function templates
Francois Pichet8387e2a2011-04-22 22:18:13 +00002858 if (cast<FunctionDecl>(D)->getDescribedFunctionTemplate() ||
2859 cast<FunctionDecl>(D)->isLateTemplateParsed())
Anders Carlsson1fe598c2009-11-24 05:16:24 +00002860 return;
2861
Anders Carlsson95d4e5d2009-04-15 15:55:24 +00002862 EmitCXXConstructors(cast<CXXConstructorDecl>(D));
2863 break;
Anders Carlsson27ae5362009-04-17 01:58:57 +00002864 case Decl::CXXDestructor:
Francois Pichet8387e2a2011-04-22 22:18:13 +00002865 if (cast<FunctionDecl>(D)->isLateTemplateParsed())
2866 return;
Anders Carlsson27ae5362009-04-17 01:58:57 +00002867 EmitCXXDestructors(cast<CXXDestructorDecl>(D));
2868 break;
Anders Carlsson36674d22009-06-11 21:22:55 +00002869
2870 case Decl::StaticAssert:
2871 // Nothing to do.
2872 break;
2873
Anders Carlsson95d4e5d2009-04-15 15:55:24 +00002874 // Objective-C Decls
Mike Stump1eb44332009-09-09 15:08:12 +00002875
Fariborz Jahanian38e24c72009-03-18 22:33:24 +00002876 // Forward declarations, no (immediate) code generation.
Chris Lattner285d0db2009-04-01 02:36:43 +00002877 case Decl::ObjCInterface:
Eric Christopherffb0c3a2012-07-19 22:22:55 +00002878 case Decl::ObjCCategory:
Chris Lattner285d0db2009-04-01 02:36:43 +00002879 break;
2880
Douglas Gregorbd9482d2012-01-01 21:23:57 +00002881 case Decl::ObjCProtocol: {
2882 ObjCProtocolDecl *Proto = cast<ObjCProtocolDecl>(D);
2883 if (Proto->isThisDeclarationADefinition())
2884 ObjCRuntime->GenerateProtocol(Proto);
Daniel Dunbar41071de2008-08-15 23:26:23 +00002885 break;
Douglas Gregorbd9482d2012-01-01 21:23:57 +00002886 }
2887
Daniel Dunbar41071de2008-08-15 23:26:23 +00002888 case Decl::ObjCCategoryImpl:
Daniel Dunbaraf05bb92008-08-26 08:29:31 +00002889 // Categories have properties but don't support synthesize so we
2890 // can ignore them here.
Peter Collingbournee9265232011-07-27 20:29:46 +00002891 ObjCRuntime->GenerateCategory(cast<ObjCCategoryImplDecl>(D));
Daniel Dunbar41071de2008-08-15 23:26:23 +00002892 break;
2893
Daniel Dunbaraf05bb92008-08-26 08:29:31 +00002894 case Decl::ObjCImplementation: {
2895 ObjCImplementationDecl *OMD = cast<ObjCImplementationDecl>(D);
2896 EmitObjCPropertyImplementations(OMD);
Fariborz Jahanian109dfc62010-04-28 21:28:56 +00002897 EmitObjCIvarInitializations(OMD);
Peter Collingbournee9265232011-07-27 20:29:46 +00002898 ObjCRuntime->GenerateClass(OMD);
Eric Christopherbe6c6862012-04-11 05:56:05 +00002899 // Emit global variable debug information.
2900 if (CGDebugInfo *DI = getModuleDebugInfo())
Alexey Samsonov96a66392012-12-03 18:28:12 +00002901 if (getCodeGenOpts().getDebugInfo() >= CodeGenOptions::LimitedDebugInfo)
2902 DI->getOrCreateInterfaceType(getContext().getObjCInterfaceType(
2903 OMD->getClassInterface()), OMD->getLocation());
Daniel Dunbar41071de2008-08-15 23:26:23 +00002904 break;
Mike Stump1eb44332009-09-09 15:08:12 +00002905 }
Daniel Dunbar41071de2008-08-15 23:26:23 +00002906 case Decl::ObjCMethod: {
2907 ObjCMethodDecl *OMD = cast<ObjCMethodDecl>(D);
2908 // If this is not a prototype, emit the body.
Argyrios Kyrtzidis6fb0aee2009-06-30 02:35:26 +00002909 if (OMD->getBody())
Daniel Dunbar41071de2008-08-15 23:26:23 +00002910 CodeGenFunction(*this).GenerateObjCMethod(OMD);
2911 break;
2912 }
Mike Stump1eb44332009-09-09 15:08:12 +00002913 case Decl::ObjCCompatibleAlias:
David Chisnall29254f42012-01-31 18:59:20 +00002914 ObjCRuntime->RegisterAlias(cast<ObjCCompatibleAliasDecl>(D));
Daniel Dunbar41071de2008-08-15 23:26:23 +00002915 break;
2916
Anders Carlsson91e20dd2009-04-02 05:55:18 +00002917 case Decl::LinkageSpec:
2918 EmitLinkageSpec(cast<LinkageSpecDecl>(D));
Daniel Dunbar41071de2008-08-15 23:26:23 +00002919 break;
Daniel Dunbar41071de2008-08-15 23:26:23 +00002920
2921 case Decl::FileScopeAsm: {
2922 FileScopeAsmDecl *AD = cast<FileScopeAsmDecl>(D);
Chris Lattner5f9e2722011-07-23 10:55:15 +00002923 StringRef AsmString = AD->getAsmString()->getString();
Mike Stump1eb44332009-09-09 15:08:12 +00002924
Daniel Dunbar41071de2008-08-15 23:26:23 +00002925 const std::string &S = getModule().getModuleInlineAsm();
2926 if (S.empty())
2927 getModule().setModuleInlineAsm(AsmString);
Joerg Sonnenberger8ce9cca2012-08-10 10:57:52 +00002928 else if (S.end()[-1] == '\n')
Chris Lattner9f5bff02011-07-23 20:04:25 +00002929 getModule().setModuleInlineAsm(S + AsmString.str());
Daniel Dunbar41071de2008-08-15 23:26:23 +00002930 else
Benjamin Kramer8d042582009-12-11 13:33:18 +00002931 getModule().setModuleInlineAsm(S + '\n' + AsmString.str());
Daniel Dunbar41071de2008-08-15 23:26:23 +00002932 break;
2933 }
Mike Stump1eb44332009-09-09 15:08:12 +00002934
Douglas Gregorb6cbe512013-01-14 17:21:00 +00002935 case Decl::Import: {
2936 ImportDecl *Import = cast<ImportDecl>(D);
2937
2938 // Ignore import declarations that come from imported modules.
2939 if (clang::Module *Owner = Import->getOwningModule()) {
2940 if (getLangOpts().CurrentModule.empty() ||
2941 Owner->getTopLevelModule()->Name == getLangOpts().CurrentModule)
2942 break;
2943 }
2944
Douglas Gregor858afb32013-01-14 20:53:57 +00002945 ImportedModules.insert(Import->getImportedModule());
Douglas Gregorb6cbe512013-01-14 17:21:00 +00002946 break;
2947 }
2948
Mike Stump1eb44332009-09-09 15:08:12 +00002949 default:
Mike Stumpf5408fe2009-05-16 07:57:57 +00002950 // Make sure we handled everything we should, every other kind is a
2951 // non-top-level decl. FIXME: Would be nice to have an isTopLevelDeclKind
2952 // function. Need to recode Decl::Kind to do that easily.
Daniel Dunbar41071de2008-08-15 23:26:23 +00002953 assert(isa<TypeDecl>(D) && "Unsupported decl kind");
2954 }
2955}
John McCall744016d2010-07-06 23:57:41 +00002956
2957/// Turns the given pointer into a constant.
2958static llvm::Constant *GetPointerConstant(llvm::LLVMContext &Context,
2959 const void *Ptr) {
2960 uintptr_t PtrInt = reinterpret_cast<uintptr_t>(Ptr);
Chris Lattner2acc6e32011-07-18 04:24:23 +00002961 llvm::Type *i64 = llvm::Type::getInt64Ty(Context);
John McCall744016d2010-07-06 23:57:41 +00002962 return llvm::ConstantInt::get(i64, PtrInt);
2963}
2964
2965static void EmitGlobalDeclMetadata(CodeGenModule &CGM,
2966 llvm::NamedMDNode *&GlobalMetadata,
2967 GlobalDecl D,
2968 llvm::GlobalValue *Addr) {
2969 if (!GlobalMetadata)
2970 GlobalMetadata =
2971 CGM.getModule().getOrInsertNamedMetadata("clang.global.decl.ptrs");
2972
2973 // TODO: should we report variant information for ctors/dtors?
2974 llvm::Value *Ops[] = {
2975 Addr,
2976 GetPointerConstant(CGM.getLLVMContext(), D.getDecl())
2977 };
Jay Foad6f141652011-04-21 19:59:12 +00002978 GlobalMetadata->addOperand(llvm::MDNode::get(CGM.getLLVMContext(), Ops));
John McCall744016d2010-07-06 23:57:41 +00002979}
2980
Richard Smith00249372013-04-06 05:00:46 +00002981/// For each function which is declared within an extern "C" region and marked
2982/// as 'used', but has internal linkage, create an alias from the unmangled
2983/// name to the mangled name if possible. People expect to be able to refer
2984/// to such functions with an unmangled name from inline assembly within the
2985/// same translation unit.
2986void CodeGenModule::EmitStaticExternCAliases() {
Richard Smith84083b72013-04-13 01:28:18 +00002987 for (StaticExternCMap::iterator I = StaticExternCValues.begin(),
2988 E = StaticExternCValues.end();
2989 I != E; ++I) {
2990 IdentifierInfo *Name = I->first;
2991 llvm::GlobalValue *Val = I->second;
Richard Smith67972042013-04-06 07:07:44 +00002992 if (Val && !getModule().getNamedValue(Name->getName()))
2993 AddUsedGlobal(new llvm::GlobalAlias(Val->getType(), Val->getLinkage(),
2994 Name->getName(), Val, &getModule()));
2995 }
Richard Smith00249372013-04-06 05:00:46 +00002996}
2997
John McCall744016d2010-07-06 23:57:41 +00002998/// Emits metadata nodes associating all the global values in the
2999/// current module with the Decls they came from. This is useful for
3000/// projects using IR gen as a subroutine.
3001///
3002/// Since there's currently no way to associate an MDNode directly
3003/// with an llvm::GlobalValue, we create a global named metadata
3004/// with the name 'clang.global.decl.ptrs'.
3005void CodeGenModule::EmitDeclMetadata() {
3006 llvm::NamedMDNode *GlobalMetadata = 0;
3007
3008 // StaticLocalDeclMap
Chris Lattner5f9e2722011-07-23 10:55:15 +00003009 for (llvm::DenseMap<GlobalDecl,StringRef>::iterator
John McCall744016d2010-07-06 23:57:41 +00003010 I = MangledDeclNames.begin(), E = MangledDeclNames.end();
3011 I != E; ++I) {
3012 llvm::GlobalValue *Addr = getModule().getNamedValue(I->second);
3013 EmitGlobalDeclMetadata(*this, GlobalMetadata, I->first, Addr);
3014 }
3015}
3016
3017/// Emits metadata nodes for all the local variables in the current
3018/// function.
3019void CodeGenFunction::EmitDeclMetadata() {
3020 if (LocalDeclMap.empty()) return;
3021
3022 llvm::LLVMContext &Context = getLLVMContext();
3023
3024 // Find the unique metadata ID for this name.
3025 unsigned DeclPtrKind = Context.getMDKindID("clang.decl.ptr");
3026
3027 llvm::NamedMDNode *GlobalMetadata = 0;
3028
3029 for (llvm::DenseMap<const Decl*, llvm::Value*>::iterator
3030 I = LocalDeclMap.begin(), E = LocalDeclMap.end(); I != E; ++I) {
3031 const Decl *D = I->first;
3032 llvm::Value *Addr = I->second;
3033
3034 if (llvm::AllocaInst *Alloca = dyn_cast<llvm::AllocaInst>(Addr)) {
3035 llvm::Value *DAddr = GetPointerConstant(getLLVMContext(), D);
Jay Foad6f141652011-04-21 19:59:12 +00003036 Alloca->setMetadata(DeclPtrKind, llvm::MDNode::get(Context, DAddr));
John McCall744016d2010-07-06 23:57:41 +00003037 } else if (llvm::GlobalValue *GV = dyn_cast<llvm::GlobalValue>(Addr)) {
3038 GlobalDecl GD = GlobalDecl(cast<VarDecl>(D));
3039 EmitGlobalDeclMetadata(CGM, GlobalMetadata, GD, GV);
3040 }
3041 }
3042}
Daniel Dunbar673431a2010-07-16 00:00:15 +00003043
Nick Lewycky3dc05412011-05-05 00:08:20 +00003044void CodeGenModule::EmitCoverageFile() {
3045 if (!getCodeGenOpts().CoverageFile.empty()) {
Nick Lewycky5ea4f442011-05-04 20:46:58 +00003046 if (llvm::NamedMDNode *CUNode = TheModule.getNamedMetadata("llvm.dbg.cu")) {
3047 llvm::NamedMDNode *GCov = TheModule.getOrInsertNamedMetadata("llvm.gcov");
3048 llvm::LLVMContext &Ctx = TheModule.getContext();
Nick Lewycky3dc05412011-05-05 00:08:20 +00003049 llvm::MDString *CoverageFile =
3050 llvm::MDString::get(Ctx, getCodeGenOpts().CoverageFile);
Nick Lewycky5ea4f442011-05-04 20:46:58 +00003051 for (int i = 0, e = CUNode->getNumOperands(); i != e; ++i) {
3052 llvm::MDNode *CU = CUNode->getOperand(i);
Nick Lewycky3dc05412011-05-05 00:08:20 +00003053 llvm::Value *node[] = { CoverageFile, CU };
Nick Lewycky5ea4f442011-05-04 20:46:58 +00003054 llvm::MDNode *N = llvm::MDNode::get(Ctx, node);
3055 GCov->addOperand(N);
3056 }
3057 }
3058 }
3059}
Nico Weberc5f80462012-10-11 10:13:44 +00003060
3061llvm::Constant *CodeGenModule::EmitUuidofInitializer(StringRef Uuid,
3062 QualType GuidType) {
3063 // Sema has checked that all uuid strings are of the form
3064 // "12345678-1234-1234-1234-1234567890ab".
3065 assert(Uuid.size() == 36);
3066 const char *Uuidstr = Uuid.data();
3067 for (int i = 0; i < 36; ++i) {
3068 if (i == 8 || i == 13 || i == 18 || i == 23) assert(Uuidstr[i] == '-');
Jordan Rose3f6f51e2013-02-08 22:30:41 +00003069 else assert(isHexDigit(Uuidstr[i]));
Nico Weberc5f80462012-10-11 10:13:44 +00003070 }
3071
3072 llvm::APInt Field0(32, StringRef(Uuidstr , 8), 16);
3073 llvm::APInt Field1(16, StringRef(Uuidstr + 9, 4), 16);
3074 llvm::APInt Field2(16, StringRef(Uuidstr + 14, 4), 16);
Nico Weber193646f2012-10-17 00:34:34 +00003075 static const int Field3ValueOffsets[] = { 19, 21, 24, 26, 28, 30, 32, 34 };
Nico Weberc5f80462012-10-11 10:13:44 +00003076
3077 APValue InitStruct(APValue::UninitStruct(), /*NumBases=*/0, /*NumFields=*/4);
3078 InitStruct.getStructField(0) = APValue(llvm::APSInt(Field0));
3079 InitStruct.getStructField(1) = APValue(llvm::APSInt(Field1));
3080 InitStruct.getStructField(2) = APValue(llvm::APSInt(Field2));
3081 APValue& Arr = InitStruct.getStructField(3);
3082 Arr = APValue(APValue::UninitArray(), 8, 8);
3083 for (int t = 0; t < 8; ++t)
Nico Weber43085812012-10-13 21:56:05 +00003084 Arr.getArrayInitializedElt(t) = APValue(llvm::APSInt(
3085 llvm::APInt(8, StringRef(Uuidstr + Field3ValueOffsets[t], 2), 16)));
Nico Weberc5f80462012-10-11 10:13:44 +00003086
3087 return EmitConstantValue(InitStruct, GuidType);
3088}