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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 Friedman678eca42013-06-13 21:50:44 +0000518 return getFunctionLinkage(cast<FunctionDecl>(GD.getDecl()));
519}
520
521llvm::GlobalValue::LinkageTypes
522CodeGenModule::getFunctionLinkage(const FunctionDecl *D) {
Argyrios Kyrtzidis90e99a82010-07-29 18:15:58 +0000523 GVALinkage Linkage = getContext().GetGVALinkageForFunction(D);
Daniel Dunbar7c65e992009-04-14 08:05:55 +0000524
Chris Lattnerf81530652010-06-30 16:58:07 +0000525 if (Linkage == GVA_Internal)
John McCalld46f9852010-02-19 01:32:20 +0000526 return llvm::Function::InternalLinkage;
Chris Lattnerf81530652010-06-30 16:58:07 +0000527
528 if (D->hasAttr<DLLExportAttr>())
John McCalld46f9852010-02-19 01:32:20 +0000529 return llvm::Function::DLLExportLinkage;
Chris Lattnerf81530652010-06-30 16:58:07 +0000530
531 if (D->hasAttr<WeakAttr>())
John McCalld46f9852010-02-19 01:32:20 +0000532 return llvm::Function::WeakAnyLinkage;
Chris Lattnerf81530652010-06-30 16:58:07 +0000533
534 // In C99 mode, 'inline' functions are guaranteed to have a strong
535 // definition somewhere else, so we can use available_externally linkage.
536 if (Linkage == GVA_C99Inline)
Fariborz Jahanianfd0f89d2011-02-04 00:08:13 +0000537 return llvm::Function::AvailableExternallyLinkage;
John McCall5584d912011-09-19 18:05:26 +0000538
539 // Note that Apple's kernel linker doesn't support symbol
540 // coalescing, so we need to avoid linkonce and weak linkages there.
541 // Normally, this means we just map to internal, but for explicit
542 // instantiations we'll map to external.
543
Chris Lattnerf81530652010-06-30 16:58:07 +0000544 // In C++, the compiler has to emit a definition in every translation unit
545 // that references the function. We should use linkonce_odr because
546 // a) if all references in this translation unit are optimized away, we
547 // don't need to codegen it. b) if the function persists, it needs to be
548 // merged with other definitions. c) C++ has the ODR, so we know the
549 // definition is dependable.
550 if (Linkage == GVA_CXXInline || Linkage == GVA_TemplateInstantiation)
David Blaikie4e4d0842012-03-11 07:00:24 +0000551 return !Context.getLangOpts().AppleKext
Fariborz Jahanian142f9e92011-02-04 00:01:24 +0000552 ? llvm::Function::LinkOnceODRLinkage
553 : llvm::Function::InternalLinkage;
Chris Lattnerf81530652010-06-30 16:58:07 +0000554
555 // An explicit instantiation of a template has weak linkage, since
556 // explicit instantiations can occur in multiple translation units
557 // and must all be equivalent. However, we are not allowed to
558 // throw away these explicit instantiations.
559 if (Linkage == GVA_ExplicitTemplateInstantiation)
David Blaikie4e4d0842012-03-11 07:00:24 +0000560 return !Context.getLangOpts().AppleKext
Fariborz Jahanian142f9e92011-02-04 00:01:24 +0000561 ? llvm::Function::WeakODRLinkage
John McCall5584d912011-09-19 18:05:26 +0000562 : llvm::Function::ExternalLinkage;
Chris Lattnerf81530652010-06-30 16:58:07 +0000563
564 // Otherwise, we have strong external linkage.
565 assert(Linkage == GVA_StrongExternal);
566 return llvm::Function::ExternalLinkage;
John McCalld46f9852010-02-19 01:32:20 +0000567}
Nuno Lopesd4cbda62008-06-08 15:45:52 +0000568
John McCalld46f9852010-02-19 01:32:20 +0000569
570/// SetFunctionDefinitionAttributes - Set attributes for a global.
571///
572/// FIXME: This is currently only done for aliases and functions, but not for
573/// variables (these details are set in EmitGlobalVarDefinition for variables).
574void CodeGenModule::SetFunctionDefinitionAttributes(const FunctionDecl *D,
575 llvm::GlobalValue *GV) {
Daniel Dunbar7c65e992009-04-14 08:05:55 +0000576 SetCommonAttributes(D, GV);
Nuno Lopesd4cbda62008-06-08 15:45:52 +0000577}
578
Daniel Dunbar7dbd8192009-04-14 07:08:30 +0000579void CodeGenModule::SetLLVMFunctionAttributes(const Decl *D,
Mike Stump1eb44332009-09-09 15:08:12 +0000580 const CGFunctionInfo &Info,
Daniel Dunbar7dbd8192009-04-14 07:08:30 +0000581 llvm::Function *F) {
Daniel Dunbarca6408c2009-09-12 00:59:20 +0000582 unsigned CallingConv;
Devang Patel761d7f72008-09-25 21:02:23 +0000583 AttributeListType AttributeList;
Bill Wendling94236e72013-02-22 00:13:35 +0000584 ConstructAttributeList(Info, D, AttributeList, CallingConv, false);
Bill Wendling785b7782012-12-07 23:17:26 +0000585 F->setAttributes(llvm::AttributeSet::get(getLLVMContext(), AttributeList));
Daniel Dunbarca6408c2009-09-12 00:59:20 +0000586 F->setCallingConv(static_cast<llvm::CallingConv::ID>(CallingConv));
Daniel Dunbarf80519b2008-09-04 23:41:35 +0000587}
588
John McCalld1e40d52011-10-02 01:16:38 +0000589/// Determines whether the language options require us to model
590/// unwind exceptions. We treat -fexceptions as mandating this
591/// except under the fragile ObjC ABI with only ObjC exceptions
592/// enabled. This means, for example, that C with -fexceptions
593/// enables this.
David Blaikie4e4d0842012-03-11 07:00:24 +0000594static bool hasUnwindExceptions(const LangOptions &LangOpts) {
John McCalld1e40d52011-10-02 01:16:38 +0000595 // If exceptions are completely disabled, obviously this is false.
David Blaikie4e4d0842012-03-11 07:00:24 +0000596 if (!LangOpts.Exceptions) return false;
John McCalld1e40d52011-10-02 01:16:38 +0000597
598 // If C++ exceptions are enabled, this is true.
David Blaikie4e4d0842012-03-11 07:00:24 +0000599 if (LangOpts.CXXExceptions) return true;
John McCalld1e40d52011-10-02 01:16:38 +0000600
601 // If ObjC exceptions are enabled, this depends on the ABI.
David Blaikie4e4d0842012-03-11 07:00:24 +0000602 if (LangOpts.ObjCExceptions) {
David Chisnall11d3f4c2012-07-03 20:49:52 +0000603 return LangOpts.ObjCRuntime.hasUnwindExceptions();
John McCalld1e40d52011-10-02 01:16:38 +0000604 }
605
606 return true;
607}
608
Daniel Dunbar7c65e992009-04-14 08:05:55 +0000609void CodeGenModule::SetLLVMFunctionAttributesForDefinition(const Decl *D,
610 llvm::Function *F) {
Benjamin Kramer06a9d042013-05-11 12:45:37 +0000611 llvm::AttrBuilder B;
612
Rafael Espindolaabca5a12011-05-25 03:44:55 +0000613 if (CodeGenOpts.UnwindTables)
Benjamin Kramer06a9d042013-05-11 12:45:37 +0000614 B.addAttribute(llvm::Attribute::UWTable);
Rafael Espindolaabca5a12011-05-25 03:44:55 +0000615
David Blaikie4e4d0842012-03-11 07:00:24 +0000616 if (!hasUnwindExceptions(LangOpts))
Benjamin Kramer06a9d042013-05-11 12:45:37 +0000617 B.addAttribute(llvm::Attribute::NoUnwind);
Daniel Dunbaraf668b02008-10-28 00:17:57 +0000618
Eli Friedman2873aee2011-08-22 23:55:33 +0000619 if (D->hasAttr<NakedAttr>()) {
620 // Naked implies noinline: we should not be inlining such functions.
Benjamin Kramer06a9d042013-05-11 12:45:37 +0000621 B.addAttribute(llvm::Attribute::Naked);
622 B.addAttribute(llvm::Attribute::NoInline);
623 } else if (D->hasAttr<NoInlineAttr>()) {
624 B.addAttribute(llvm::Attribute::NoInline);
625 } else if ((D->hasAttr<AlwaysInlineAttr>() ||
626 D->hasAttr<ForceInlineAttr>()) &&
627 !F->getAttributes().hasAttribute(llvm::AttributeSet::FunctionIndex,
628 llvm::Attribute::NoInline)) {
629 // (noinline wins over always_inline, and we can't specify both in IR)
630 B.addAttribute(llvm::Attribute::AlwaysInline);
Eli Friedman2873aee2011-08-22 23:55:33 +0000631 }
Daniel Dunbardd0cb222010-09-29 18:20:25 +0000632
Diego Novillod27e5cb2013-05-24 20:18:15 +0000633 if (D->hasAttr<ColdAttr>()) {
Benjamin Kramer06a9d042013-05-11 12:45:37 +0000634 B.addAttribute(llvm::Attribute::OptimizeForSize);
Diego Novillod27e5cb2013-05-24 20:18:15 +0000635 B.addAttribute(llvm::Attribute::Cold);
636 }
Benjamin Krameree409a92012-05-12 21:10:52 +0000637
Quentin Colombetaee56fa2012-11-01 23:55:47 +0000638 if (D->hasAttr<MinSizeAttr>())
Benjamin Kramer06a9d042013-05-11 12:45:37 +0000639 B.addAttribute(llvm::Attribute::MinSize);
Richard Smithef4d5ce2012-09-28 22:46:07 +0000640
David Blaikie4e4d0842012-03-11 07:00:24 +0000641 if (LangOpts.getStackProtector() == LangOptions::SSPOn)
Benjamin Kramer06a9d042013-05-11 12:45:37 +0000642 B.addAttribute(llvm::Attribute::StackProtect);
David Blaikie4e4d0842012-03-11 07:00:24 +0000643 else if (LangOpts.getStackProtector() == LangOptions::SSPReq)
Benjamin Kramer06a9d042013-05-11 12:45:37 +0000644 B.addAttribute(llvm::Attribute::StackProtectReq);
Will Dietz4f45bc02013-01-18 11:30:38 +0000645
Alexey Samsonov7e73f942013-03-06 10:54:18 +0000646 // Add sanitizer attributes if function is not blacklisted.
647 if (!SanitizerBlacklist.isIn(*F)) {
648 // When AddressSanitizer is enabled, set SanitizeAddress attribute
649 // unless __attribute__((no_sanitize_address)) is used.
650 if (SanOpts.Address && !D->hasAttr<NoSanitizeAddressAttr>())
Benjamin Kramer06a9d042013-05-11 12:45:37 +0000651 B.addAttribute(llvm::Attribute::SanitizeAddress);
Alexey Samsonov7e73f942013-03-06 10:54:18 +0000652 // Same for ThreadSanitizer and __attribute__((no_sanitize_thread))
653 if (SanOpts.Thread && !D->hasAttr<NoSanitizeThreadAttr>()) {
Benjamin Kramer06a9d042013-05-11 12:45:37 +0000654 B.addAttribute(llvm::Attribute::SanitizeThread);
Alexey Samsonov7e73f942013-03-06 10:54:18 +0000655 }
656 // Same for MemorySanitizer and __attribute__((no_sanitize_memory))
657 if (SanOpts.Memory && !D->hasAttr<NoSanitizeMemoryAttr>())
Benjamin Kramer06a9d042013-05-11 12:45:37 +0000658 B.addAttribute(llvm::Attribute::SanitizeMemory);
Alexey Samsonov7e73f942013-03-06 10:54:18 +0000659 }
Alexander Potapenko89651ea2012-02-02 11:49:28 +0000660
Benjamin Kramer06a9d042013-05-11 12:45:37 +0000661 F->addAttributes(llvm::AttributeSet::FunctionIndex,
662 llvm::AttributeSet::get(
663 F->getContext(), llvm::AttributeSet::FunctionIndex, B));
664
665 if (isa<CXXConstructorDecl>(D) || isa<CXXDestructorDecl>(D))
666 F->setUnnamedAddr(true);
667 else if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D))
668 if (MD->isVirtual())
669 F->setUnnamedAddr(true);
670
Sean Huntcf807c42010-08-18 23:23:40 +0000671 unsigned alignment = D->getMaxAlignment() / Context.getCharWidth();
672 if (alignment)
673 F->setAlignment(alignment);
674
Mike Stumpfb51ddf2009-10-05 22:49:20 +0000675 // C++ ABI requires 2-byte alignment for member functions.
Mike Stumpbd6dbd12009-10-05 23:08:21 +0000676 if (F->getAlignment() < 2 && isa<CXXMethodDecl>(D))
677 F->setAlignment(2);
Daniel Dunbarf80519b2008-09-04 23:41:35 +0000678}
679
Mike Stump1eb44332009-09-09 15:08:12 +0000680void CodeGenModule::SetCommonAttributes(const Decl *D,
Daniel Dunbar7c65e992009-04-14 08:05:55 +0000681 llvm::GlobalValue *GV) {
Anders Carlsson934176f2011-01-29 19:41:00 +0000682 if (const NamedDecl *ND = dyn_cast<NamedDecl>(D))
683 setGlobalVisibility(GV, ND);
John McCall1fb0caa2010-10-22 21:05:15 +0000684 else
685 GV->setVisibility(llvm::GlobalValue::DefaultVisibility);
Daniel Dunbar7c65e992009-04-14 08:05:55 +0000686
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +0000687 if (D->hasAttr<UsedAttr>())
Daniel Dunbar7c65e992009-04-14 08:05:55 +0000688 AddUsedGlobal(GV);
689
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +0000690 if (const SectionAttr *SA = D->getAttr<SectionAttr>())
Daniel Dunbar7c65e992009-04-14 08:05:55 +0000691 GV->setSection(SA->getName());
Anton Korobeynikov82d0a412010-01-10 12:58:08 +0000692
Rafael Espindola9a2f5d72013-03-19 15:03:47 +0000693 // Alias cannot have attributes. Filter them here.
694 if (!isa<llvm::GlobalAlias>(GV))
695 getTargetCodeGenInfo().SetTargetAttributes(D, GV, *this);
Daniel Dunbar7c65e992009-04-14 08:05:55 +0000696}
697
Daniel Dunbar0e4f40e2009-04-17 00:48:04 +0000698void CodeGenModule::SetInternalFunctionAttributes(const Decl *D,
699 llvm::Function *F,
700 const CGFunctionInfo &FI) {
701 SetLLVMFunctionAttributes(D, FI, F);
702 SetLLVMFunctionAttributesForDefinition(D, F);
Daniel Dunbar7c65e992009-04-14 08:05:55 +0000703
704 F->setLinkage(llvm::Function::InternalLinkage);
705
Daniel Dunbar0e4f40e2009-04-17 00:48:04 +0000706 SetCommonAttributes(D, F);
Daniel Dunbarf80519b2008-09-04 23:41:35 +0000707}
708
Anders Carlssonb2bcf1c2010-02-06 02:44:09 +0000709void CodeGenModule::SetFunctionAttributes(GlobalDecl GD,
Eli Friedmanc6c14d12009-05-26 01:22:57 +0000710 llvm::Function *F,
711 bool IsIncompleteFunction) {
Peter Collingbourne0ac2cf42011-04-06 12:29:04 +0000712 if (unsigned IID = F->getIntrinsicID()) {
713 // If this is an intrinsic function, set the function's attributes
714 // to the intrinsic's attributes.
Bill Wendling50e6b182012-10-15 04:47:45 +0000715 F->setAttributes(llvm::Intrinsic::getAttributes(getLLVMContext(),
716 (llvm::Intrinsic::ID)IID));
Peter Collingbourne0ac2cf42011-04-06 12:29:04 +0000717 return;
718 }
719
Anders Carlssonb2bcf1c2010-02-06 02:44:09 +0000720 const FunctionDecl *FD = cast<FunctionDecl>(GD.getDecl());
721
Eli Friedmanc6c14d12009-05-26 01:22:57 +0000722 if (!IsIncompleteFunction)
John McCallde5d3c72012-02-17 03:33:10 +0000723 SetLLVMFunctionAttributes(FD, getTypes().arrangeGlobalDeclaration(GD), F);
Mike Stump1eb44332009-09-09 15:08:12 +0000724
Stephen Lin3b50e8d2013-06-30 20:40:16 +0000725 if (getCXXABI().HasThisReturn(GD)) {
726 assert(!F->arg_empty() &&
727 F->arg_begin()->getType()
728 ->canLosslesslyBitCastTo(F->getReturnType()) &&
729 "unexpected this return");
730 F->addAttribute(1, llvm::Attribute::Returned);
731 }
732
Daniel Dunbar7c65e992009-04-14 08:05:55 +0000733 // Only a few attributes are set on declarations; these may later be
734 // overridden by a definition.
Mike Stump1eb44332009-09-09 15:08:12 +0000735
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +0000736 if (FD->hasAttr<DLLImportAttr>()) {
Daniel Dunbar7c65e992009-04-14 08:05:55 +0000737 F->setLinkage(llvm::Function::DLLImportLinkage);
Mike Stump1eb44332009-09-09 15:08:12 +0000738 } else if (FD->hasAttr<WeakAttr>() ||
Douglas Gregor0a0d2b12011-03-23 00:50:03 +0000739 FD->isWeakImported()) {
Daniel Dunbar7c65e992009-04-14 08:05:55 +0000740 // "extern_weak" is overloaded in LLVM; we probably should have
Mike Stump1eb44332009-09-09 15:08:12 +0000741 // separate linkage types for this.
Daniel Dunbar7c65e992009-04-14 08:05:55 +0000742 F->setLinkage(llvm::Function::ExternalWeakLinkage);
743 } else {
Mike Stump1eb44332009-09-09 15:08:12 +0000744 F->setLinkage(llvm::Function::ExternalLinkage);
John McCallaf146032010-10-30 11:50:40 +0000745
Rafael Espindola2beda122013-02-27 02:15:29 +0000746 LinkageInfo LV = FD->getLinkageAndVisibility();
Rafael Espindolaf127eb82013-02-27 02:56:45 +0000747 if (LV.getLinkage() == ExternalLinkage && LV.isVisibilityExplicit()) {
748 F->setVisibility(GetLLVMVisibility(LV.getVisibility()));
John McCallaf146032010-10-30 11:50:40 +0000749 }
Daniel Dunbar7c65e992009-04-14 08:05:55 +0000750 }
751
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +0000752 if (const SectionAttr *SA = FD->getAttr<SectionAttr>())
Daniel Dunbar7c65e992009-04-14 08:05:55 +0000753 F->setSection(SA->getName());
Daniel Dunbar219df662008-09-08 23:44:31 +0000754}
755
Daniel Dunbar02698712009-02-13 20:29:50 +0000756void CodeGenModule::AddUsedGlobal(llvm::GlobalValue *GV) {
Mike Stump1eb44332009-09-09 15:08:12 +0000757 assert(!GV->isDeclaration() &&
Daniel Dunbar02698712009-02-13 20:29:50 +0000758 "Only globals with definition can force usage.");
Chris Lattner35f38a22009-03-31 22:37:52 +0000759 LLVMUsed.push_back(GV);
Daniel Dunbar02698712009-02-13 20:29:50 +0000760}
761
762void CodeGenModule::EmitLLVMUsed() {
763 // Don't create llvm.used if there is no need.
Chris Lattnerad64e022009-07-17 23:57:13 +0000764 if (LLVMUsed.empty())
Daniel Dunbar02698712009-02-13 20:29:50 +0000765 return;
766
Chris Lattner35f38a22009-03-31 22:37:52 +0000767 // Convert LLVMUsed to what ConstantArray needs.
Chris Lattner0b239712012-02-06 22:16:34 +0000768 SmallVector<llvm::Constant*, 8> UsedArray;
Chris Lattner35f38a22009-03-31 22:37:52 +0000769 UsedArray.resize(LLVMUsed.size());
770 for (unsigned i = 0, e = LLVMUsed.size(); i != e; ++i) {
Mike Stump1eb44332009-09-09 15:08:12 +0000771 UsedArray[i] =
772 llvm::ConstantExpr::getBitCast(cast<llvm::Constant>(&*LLVMUsed[i]),
Chris Lattner0b239712012-02-06 22:16:34 +0000773 Int8PtrTy);
Chris Lattner35f38a22009-03-31 22:37:52 +0000774 }
Mike Stump1eb44332009-09-09 15:08:12 +0000775
Fariborz Jahanianc38e9af2009-06-23 21:47:46 +0000776 if (UsedArray.empty())
777 return;
Chris Lattner0b239712012-02-06 22:16:34 +0000778 llvm::ArrayType *ATy = llvm::ArrayType::get(Int8PtrTy, UsedArray.size());
Mike Stump1eb44332009-09-09 15:08:12 +0000779
780 llvm::GlobalVariable *GV =
781 new llvm::GlobalVariable(getModule(), ATy, false,
Daniel Dunbar02698712009-02-13 20:29:50 +0000782 llvm::GlobalValue::AppendingLinkage,
Owen Anderson7db6d832009-07-28 18:33:04 +0000783 llvm::ConstantArray::get(ATy, UsedArray),
Owen Anderson1c431b32009-07-08 19:05:04 +0000784 "llvm.used");
Daniel Dunbar02698712009-02-13 20:29:50 +0000785
786 GV->setSection("llvm.metadata");
787}
788
Reid Kleckner3190ca92013-05-08 13:44:39 +0000789void CodeGenModule::AppendLinkerOptions(StringRef Opts) {
790 llvm::Value *MDOpts = llvm::MDString::get(getLLVMContext(), Opts);
791 LinkerOptionsMetadata.push_back(llvm::MDNode::get(getLLVMContext(), MDOpts));
792}
793
Aaron Ballmana7ff62f2013-06-04 02:07:14 +0000794void CodeGenModule::AddDetectMismatch(StringRef Name, StringRef Value) {
795 llvm::SmallString<32> Opt;
796 getTargetCodeGenInfo().getDetectMismatchOption(Name, Value, Opt);
797 llvm::Value *MDOpts = llvm::MDString::get(getLLVMContext(), Opt);
798 LinkerOptionsMetadata.push_back(llvm::MDNode::get(getLLVMContext(), MDOpts));
799}
800
Reid Kleckner3190ca92013-05-08 13:44:39 +0000801void CodeGenModule::AddDependentLib(StringRef Lib) {
802 llvm::SmallString<24> Opt;
803 getTargetCodeGenInfo().getDependentLibraryOption(Lib, Opt);
804 llvm::Value *MDOpts = llvm::MDString::get(getLLVMContext(), Opt);
805 LinkerOptionsMetadata.push_back(llvm::MDNode::get(getLLVMContext(), MDOpts));
806}
807
Douglas Gregor858afb32013-01-14 20:53:57 +0000808/// \brief Add link options implied by the given module, including modules
809/// it depends on, using a postorder walk.
Reid Kleckner3190ca92013-05-08 13:44:39 +0000810static void addLinkOptionsPostorder(CodeGenModule &CGM,
Douglas Gregor858afb32013-01-14 20:53:57 +0000811 Module *Mod,
Daniel Dunbarf9d03c12013-01-17 01:35:06 +0000812 SmallVectorImpl<llvm::Value *> &Metadata,
Douglas Gregor858afb32013-01-14 20:53:57 +0000813 llvm::SmallPtrSet<Module *, 16> &Visited) {
814 // Import this module's parent.
815 if (Mod->Parent && Visited.insert(Mod->Parent)) {
Reid Kleckner3190ca92013-05-08 13:44:39 +0000816 addLinkOptionsPostorder(CGM, Mod->Parent, Metadata, Visited);
Douglas Gregor858afb32013-01-14 20:53:57 +0000817 }
818
819 // Import this module's dependencies.
820 for (unsigned I = Mod->Imports.size(); I > 0; --I) {
821 if (Visited.insert(Mod->Imports[I-1]))
Reid Kleckner3190ca92013-05-08 13:44:39 +0000822 addLinkOptionsPostorder(CGM, Mod->Imports[I-1], Metadata, Visited);
Douglas Gregor858afb32013-01-14 20:53:57 +0000823 }
824
825 // Add linker options to link against the libraries/frameworks
826 // described by this module.
Reid Kleckner3190ca92013-05-08 13:44:39 +0000827 llvm::LLVMContext &Context = CGM.getLLVMContext();
Douglas Gregor858afb32013-01-14 20:53:57 +0000828 for (unsigned I = Mod->LinkLibraries.size(); I > 0; --I) {
Reid Kleckner3190ca92013-05-08 13:44:39 +0000829 // Link against a framework. Frameworks are currently Darwin only, so we
830 // don't to ask TargetCodeGenInfo for the spelling of the linker option.
Douglas Gregor858afb32013-01-14 20:53:57 +0000831 if (Mod->LinkLibraries[I-1].IsFramework) {
832 llvm::Value *Args[2] = {
833 llvm::MDString::get(Context, "-framework"),
834 llvm::MDString::get(Context, Mod->LinkLibraries[I-1].Library)
835 };
836
837 Metadata.push_back(llvm::MDNode::get(Context, Args));
838 continue;
839 }
840
841 // Link against a library.
Reid Kleckner3190ca92013-05-08 13:44:39 +0000842 llvm::SmallString<24> Opt;
843 CGM.getTargetCodeGenInfo().getDependentLibraryOption(
844 Mod->LinkLibraries[I-1].Library, Opt);
845 llvm::Value *OptString = llvm::MDString::get(Context, Opt);
Douglas Gregor858afb32013-01-14 20:53:57 +0000846 Metadata.push_back(llvm::MDNode::get(Context, OptString));
847 }
848}
849
850void CodeGenModule::EmitModuleLinkOptions() {
851 // Collect the set of all of the modules we want to visit to emit link
852 // options, which is essentially the imported modules and all of their
853 // non-explicit child modules.
854 llvm::SetVector<clang::Module *> LinkModules;
855 llvm::SmallPtrSet<clang::Module *, 16> Visited;
856 SmallVector<clang::Module *, 16> Stack;
857
858 // Seed the stack with imported modules.
859 for (llvm::SetVector<clang::Module *>::iterator M = ImportedModules.begin(),
860 MEnd = ImportedModules.end();
861 M != MEnd; ++M) {
862 if (Visited.insert(*M))
863 Stack.push_back(*M);
864 }
865
866 // Find all of the modules to import, making a little effort to prune
867 // non-leaf modules.
868 while (!Stack.empty()) {
869 clang::Module *Mod = Stack.back();
870 Stack.pop_back();
871
872 bool AnyChildren = false;
873
874 // Visit the submodules of this module.
875 for (clang::Module::submodule_iterator Sub = Mod->submodule_begin(),
876 SubEnd = Mod->submodule_end();
877 Sub != SubEnd; ++Sub) {
878 // Skip explicit children; they need to be explicitly imported to be
879 // linked against.
880 if ((*Sub)->IsExplicit)
881 continue;
882
883 if (Visited.insert(*Sub)) {
884 Stack.push_back(*Sub);
885 AnyChildren = true;
886 }
887 }
888
889 // We didn't find any children, so add this module to the list of
890 // modules to link against.
891 if (!AnyChildren) {
892 LinkModules.insert(Mod);
893 }
894 }
895
896 // Add link options for all of the imported modules in reverse topological
Reid Kleckner3190ca92013-05-08 13:44:39 +0000897 // order. We don't do anything to try to order import link flags with respect
898 // to linker options inserted by things like #pragma comment().
Daniel Dunbarf9d03c12013-01-17 01:35:06 +0000899 SmallVector<llvm::Value *, 16> MetadataArgs;
Douglas Gregor858afb32013-01-14 20:53:57 +0000900 Visited.clear();
901 for (llvm::SetVector<clang::Module *>::iterator M = LinkModules.begin(),
902 MEnd = LinkModules.end();
903 M != MEnd; ++M) {
904 if (Visited.insert(*M))
Reid Kleckner3190ca92013-05-08 13:44:39 +0000905 addLinkOptionsPostorder(*this, *M, MetadataArgs, Visited);
Douglas Gregor858afb32013-01-14 20:53:57 +0000906 }
Daniel Dunbarf9d03c12013-01-17 01:35:06 +0000907 std::reverse(MetadataArgs.begin(), MetadataArgs.end());
Reid Kleckner3190ca92013-05-08 13:44:39 +0000908 LinkerOptionsMetadata.append(MetadataArgs.begin(), MetadataArgs.end());
Douglas Gregor858afb32013-01-14 20:53:57 +0000909
Daniel Dunbarf9d03c12013-01-17 01:35:06 +0000910 // Add the linker options metadata flag.
911 getModule().addModuleFlag(llvm::Module::AppendUnique, "Linker Options",
Reid Kleckner3190ca92013-05-08 13:44:39 +0000912 llvm::MDNode::get(getLLVMContext(),
913 LinkerOptionsMetadata));
Douglas Gregor858afb32013-01-14 20:53:57 +0000914}
915
Daniel Dunbar02698712009-02-13 20:29:50 +0000916void CodeGenModule::EmitDeferred() {
Chris Lattner67b00522009-03-21 09:44:56 +0000917 // Emit code for any potentially referenced deferred decls. Since a
918 // previously unused static decl may become used during the generation of code
Nick Lewyckydce67a72011-07-18 05:26:13 +0000919 // for a static function, iterate until no changes are made.
Rafael Espindolabbf58bb2010-03-10 02:19:29 +0000920
John McCalld5617ee2013-01-25 22:31:03 +0000921 while (true) {
Anders Carlsson046c2942010-04-17 20:15:18 +0000922 if (!DeferredVTables.empty()) {
John McCalld5617ee2013-01-25 22:31:03 +0000923 EmitDeferredVTables();
924
925 // Emitting a v-table doesn't directly cause more v-tables to
926 // become deferred, although it can cause functions to be
927 // emitted that then need those v-tables.
928 assert(DeferredVTables.empty());
Rafael Espindolabbf58bb2010-03-10 02:19:29 +0000929 }
930
John McCalld5617ee2013-01-25 22:31:03 +0000931 // Stop if we're out of both deferred v-tables and deferred declarations.
932 if (DeferredDeclsToEmit.empty()) break;
933
Anders Carlsson2a131fb2009-05-05 04:44:02 +0000934 GlobalDecl D = DeferredDeclsToEmit.back();
Chris Lattner67b00522009-03-21 09:44:56 +0000935 DeferredDeclsToEmit.pop_back();
936
John McCallc76702c2010-05-27 01:45:30 +0000937 // Check to see if we've already emitted this. This is necessary
938 // for a couple of reasons: first, decls can end up in the
939 // deferred-decls queue multiple times, and second, decls can end
940 // up with definitions in unusual ways (e.g. by an extern inline
941 // function acquiring a strong function redefinition). Just
942 // ignore these cases.
943 //
944 // TODO: That said, looking this up multiple times is very wasteful.
Chris Lattner5f9e2722011-07-23 10:55:15 +0000945 StringRef Name = getMangledName(D);
John McCallf746aa62010-03-19 23:29:14 +0000946 llvm::GlobalValue *CGRef = GetGlobalValue(Name);
Chris Lattner67b00522009-03-21 09:44:56 +0000947 assert(CGRef && "Deferred decl wasn't referenced?");
Mike Stump1eb44332009-09-09 15:08:12 +0000948
Chris Lattner67b00522009-03-21 09:44:56 +0000949 if (!CGRef->isDeclaration())
950 continue;
Mike Stump1eb44332009-09-09 15:08:12 +0000951
John McCallc76702c2010-05-27 01:45:30 +0000952 // GlobalAlias::isDeclaration() defers to the aliasee, but for our
953 // purposes an alias counts as a definition.
954 if (isa<llvm::GlobalAlias>(CGRef))
955 continue;
956
Chris Lattner67b00522009-03-21 09:44:56 +0000957 // Otherwise, emit the definition and move on to the next one.
958 EmitGlobalDefinition(D);
959 }
Reid Spencer5f016e22007-07-11 17:01:13 +0000960}
961
Julien Lerouge77f68bb2011-09-09 22:41:49 +0000962void CodeGenModule::EmitGlobalAnnotations() {
963 if (Annotations.empty())
964 return;
965
966 // Create a new global variable for the ConstantStruct in the Module.
967 llvm::Constant *Array = llvm::ConstantArray::get(llvm::ArrayType::get(
968 Annotations[0]->getType(), Annotations.size()), Annotations);
969 llvm::GlobalValue *gv = new llvm::GlobalVariable(getModule(),
970 Array->getType(), false, llvm::GlobalValue::AppendingLinkage, Array,
971 "llvm.global.annotations");
972 gv->setSection(AnnotationSection);
973}
974
Dmitri Gribenkocfa88f82013-01-12 19:30:44 +0000975llvm::Constant *CodeGenModule::EmitAnnotationString(StringRef Str) {
Julien Lerouge77f68bb2011-09-09 22:41:49 +0000976 llvm::StringMap<llvm::Constant*>::iterator i = AnnotationStrings.find(Str);
977 if (i != AnnotationStrings.end())
978 return i->second;
979
980 // Not found yet, create a new global.
Chris Lattner94010692012-02-05 02:30:40 +0000981 llvm::Constant *s = llvm::ConstantDataArray::getString(getLLVMContext(), Str);
Julien Lerouge77f68bb2011-09-09 22:41:49 +0000982 llvm::GlobalValue *gv = new llvm::GlobalVariable(getModule(), s->getType(),
983 true, llvm::GlobalValue::PrivateLinkage, s, ".str");
984 gv->setSection(AnnotationSection);
985 gv->setUnnamedAddr(true);
986 AnnotationStrings[Str] = gv;
987 return gv;
988}
989
990llvm::Constant *CodeGenModule::EmitAnnotationUnit(SourceLocation Loc) {
991 SourceManager &SM = getContext().getSourceManager();
992 PresumedLoc PLoc = SM.getPresumedLoc(Loc);
993 if (PLoc.isValid())
994 return EmitAnnotationString(PLoc.getFilename());
995 return EmitAnnotationString(SM.getBufferName(Loc));
996}
997
998llvm::Constant *CodeGenModule::EmitAnnotationLineNo(SourceLocation L) {
999 SourceManager &SM = getContext().getSourceManager();
1000 PresumedLoc PLoc = SM.getPresumedLoc(L);
1001 unsigned LineNo = PLoc.isValid() ? PLoc.getLine() :
1002 SM.getExpansionLineNumber(L);
1003 return llvm::ConstantInt::get(Int32Ty, LineNo);
1004}
1005
Mike Stump1eb44332009-09-09 15:08:12 +00001006llvm::Constant *CodeGenModule::EmitAnnotateAttr(llvm::GlobalValue *GV,
Nate Begeman8bd4afe2008-04-19 04:17:09 +00001007 const AnnotateAttr *AA,
Julien Lerouge77f68bb2011-09-09 22:41:49 +00001008 SourceLocation L) {
1009 // Get the globals for file name, annotation, and the line number.
1010 llvm::Constant *AnnoGV = EmitAnnotationString(AA->getAnnotation()),
1011 *UnitGV = EmitAnnotationUnit(L),
1012 *LineNoCst = EmitAnnotationLineNo(L);
Nate Begeman8bd4afe2008-04-19 04:17:09 +00001013
Daniel Dunbar57d5cee2009-04-14 22:41:13 +00001014 // Create the ConstantStruct for the global annotation.
Nate Begeman8bd4afe2008-04-19 04:17:09 +00001015 llvm::Constant *Fields[4] = {
Julien Lerouge77f68bb2011-09-09 22:41:49 +00001016 llvm::ConstantExpr::getBitCast(GV, Int8PtrTy),
1017 llvm::ConstantExpr::getBitCast(AnnoGV, Int8PtrTy),
1018 llvm::ConstantExpr::getBitCast(UnitGV, Int8PtrTy),
1019 LineNoCst
Nate Begeman8bd4afe2008-04-19 04:17:09 +00001020 };
Chris Lattnerc5cbb902011-06-20 04:01:35 +00001021 return llvm::ConstantStruct::getAnon(Fields);
Nate Begeman8bd4afe2008-04-19 04:17:09 +00001022}
1023
Julien Lerouge77f68bb2011-09-09 22:41:49 +00001024void CodeGenModule::AddGlobalAnnotations(const ValueDecl *D,
1025 llvm::GlobalValue *GV) {
1026 assert(D->hasAttr<AnnotateAttr>() && "no annotate attribute");
1027 // Get the struct elements for these annotations.
1028 for (specific_attr_iterator<AnnotateAttr>
1029 ai = D->specific_attr_begin<AnnotateAttr>(),
1030 ae = D->specific_attr_end<AnnotateAttr>(); ai != ae; ++ai)
1031 Annotations.push_back(EmitAnnotateAttr(GV, *ai, D->getLocation()));
1032}
1033
Argyrios Kyrtzidisa6d6af32010-07-27 22:37:14 +00001034bool CodeGenModule::MayDeferGeneration(const ValueDecl *Global) {
Argyrios Kyrtzidis90e99a82010-07-29 18:15:58 +00001035 // Never defer when EmitAllDecls is specified.
David Blaikie4e4d0842012-03-11 07:00:24 +00001036 if (LangOpts.EmitAllDecls)
Daniel Dunbar73241df2009-02-13 21:18:01 +00001037 return false;
Daniel Dunbarbd012ff2008-07-29 23:18:29 +00001038
Argyrios Kyrtzidis4ac7c0b2010-07-29 20:08:05 +00001039 return !getContext().DeclMustBeEmitted(Global);
Daniel Dunbar73241df2009-02-13 21:18:01 +00001040}
1041
Nico Weberc5f80462012-10-11 10:13:44 +00001042llvm::Constant *CodeGenModule::GetAddrOfUuidDescriptor(
1043 const CXXUuidofExpr* E) {
1044 // Sema has verified that IIDSource has a __declspec(uuid()), and that its
1045 // well-formed.
1046 StringRef Uuid;
1047 if (E->isTypeOperand())
1048 Uuid = CXXUuidofExpr::GetUuidAttrOfType(E->getTypeOperand())->getGuid();
1049 else {
1050 // Special case: __uuidof(0) means an all-zero GUID.
1051 Expr *Op = E->getExprOperand();
1052 if (!Op->isNullPointerConstant(Context, Expr::NPC_ValueDependentIsNull))
1053 Uuid = CXXUuidofExpr::GetUuidAttrOfType(Op->getType())->getGuid();
1054 else
1055 Uuid = "00000000-0000-0000-0000-000000000000";
1056 }
1057 std::string Name = "__uuid_" + Uuid.str();
1058
1059 // Look for an existing global.
1060 if (llvm::GlobalVariable *GV = getModule().getNamedGlobal(Name))
1061 return GV;
1062
1063 llvm::Constant *Init = EmitUuidofInitializer(Uuid, E->getType());
1064 assert(Init && "failed to initialize as constant");
1065
1066 // GUIDs are assumed to be 16 bytes, spread over 4-2-2-8 bytes. However, the
1067 // first field is declared as "long", which for many targets is 8 bytes.
1068 // Those architectures are not supported. (With the MS abi, long is always 4
1069 // bytes.)
1070 llvm::Type *GuidType = getTypes().ConvertType(E->getType());
1071 if (Init->getType() != GuidType) {
1072 DiagnosticsEngine &Diags = getDiags();
1073 unsigned DiagID = Diags.getCustomDiagID(DiagnosticsEngine::Error,
1074 "__uuidof codegen is not supported on this architecture");
1075 Diags.Report(E->getExprLoc(), DiagID) << E->getSourceRange();
1076 Init = llvm::UndefValue::get(GuidType);
1077 }
1078
1079 llvm::GlobalVariable *GV = new llvm::GlobalVariable(getModule(), GuidType,
1080 /*isConstant=*/true, llvm::GlobalValue::PrivateLinkage, Init, Name);
1081 GV->setUnnamedAddr(true);
1082 return GV;
1083}
1084
Rafael Espindola6a836702010-03-04 18:17:24 +00001085llvm::Constant *CodeGenModule::GetWeakRefReference(const ValueDecl *VD) {
1086 const AliasAttr *AA = VD->getAttr<AliasAttr>();
1087 assert(AA && "No alias?");
1088
Chris Lattner2acc6e32011-07-18 04:24:23 +00001089 llvm::Type *DeclTy = getTypes().ConvertTypeForMem(VD->getType());
Rafael Espindola6a836702010-03-04 18:17:24 +00001090
Rafael Espindola6a836702010-03-04 18:17:24 +00001091 // See if there is already something with the target's name in the module.
John McCallf746aa62010-03-19 23:29:14 +00001092 llvm::GlobalValue *Entry = GetGlobalValue(AA->getAliasee());
Joerg Sonnenberger4695f912012-10-16 17:45:27 +00001093 if (Entry) {
1094 unsigned AS = getContext().getTargetAddressSpace(VD->getType());
1095 return llvm::ConstantExpr::getBitCast(Entry, DeclTy->getPointerTo(AS));
1096 }
Rafael Espindola6a836702010-03-04 18:17:24 +00001097
1098 llvm::Constant *Aliasee;
1099 if (isa<llvm::FunctionType>(DeclTy))
Alex Rosenbergc857ce82012-10-05 23:12:53 +00001100 Aliasee = GetOrCreateLLVMFunction(AA->getAliasee(), DeclTy,
1101 GlobalDecl(cast<FunctionDecl>(VD)),
Anders Carlsson1faa89f2011-02-05 04:35:53 +00001102 /*ForVTable=*/false);
Rafael Espindola6a836702010-03-04 18:17:24 +00001103 else
John McCallf746aa62010-03-19 23:29:14 +00001104 Aliasee = GetOrCreateLLVMGlobal(AA->getAliasee(),
Rafael Espindola6a836702010-03-04 18:17:24 +00001105 llvm::PointerType::getUnqual(DeclTy), 0);
Joerg Sonnenberger4695f912012-10-16 17:45:27 +00001106
1107 llvm::GlobalValue* F = cast<llvm::GlobalValue>(Aliasee);
1108 F->setLinkage(llvm::Function::ExternalWeakLinkage);
1109 WeakRefReferences.insert(F);
Rafael Espindola6a836702010-03-04 18:17:24 +00001110
1111 return Aliasee;
1112}
1113
Chris Lattnerb4880ba2009-05-12 21:21:08 +00001114void CodeGenModule::EmitGlobal(GlobalDecl GD) {
Anders Carlsson4a6835e2009-09-10 23:38:47 +00001115 const ValueDecl *Global = cast<ValueDecl>(GD.getDecl());
Mike Stump1eb44332009-09-09 15:08:12 +00001116
Rafael Espindola6a836702010-03-04 18:17:24 +00001117 // Weak references don't produce any output by themselves.
1118 if (Global->hasAttr<WeakRefAttr>())
1119 return;
1120
Chris Lattnerbd532712009-03-22 21:47:11 +00001121 // If this is an alias definition (which otherwise looks like a declaration)
1122 // emit it now.
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +00001123 if (Global->hasAttr<AliasAttr>())
John McCallf746aa62010-03-19 23:29:14 +00001124 return EmitAliasDefinition(GD);
Daniel Dunbar219df662008-09-08 23:44:31 +00001125
Peter Collingbourned51e43a2011-10-06 18:29:46 +00001126 // If this is CUDA, be selective about which declarations we emit.
David Blaikie4e4d0842012-03-11 07:00:24 +00001127 if (LangOpts.CUDA) {
Peter Collingbourned51e43a2011-10-06 18:29:46 +00001128 if (CodeGenOpts.CUDAIsDevice) {
1129 if (!Global->hasAttr<CUDADeviceAttr>() &&
1130 !Global->hasAttr<CUDAGlobalAttr>() &&
1131 !Global->hasAttr<CUDAConstantAttr>() &&
1132 !Global->hasAttr<CUDASharedAttr>())
1133 return;
1134 } else {
1135 if (!Global->hasAttr<CUDAHostAttr>() && (
1136 Global->hasAttr<CUDADeviceAttr>() ||
1137 Global->hasAttr<CUDAConstantAttr>() ||
1138 Global->hasAttr<CUDASharedAttr>()))
1139 return;
1140 }
1141 }
1142
Chris Lattner67b00522009-03-21 09:44:56 +00001143 // Ignore declarations, they will be emitted on their first use.
Daniel Dunbar5e1e1f92009-03-19 08:27:24 +00001144 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(Global)) {
Daniel Dunbar73241df2009-02-13 21:18:01 +00001145 // Forward declarations are emitted lazily on first use.
Nick Lewyckydce67a72011-07-18 05:26:13 +00001146 if (!FD->doesThisDeclarationHaveABody()) {
1147 if (!FD->doesDeclarationForceExternallyVisibleDefinition())
1148 return;
1149
1150 const FunctionDecl *InlineDefinition = 0;
1151 FD->getBody(InlineDefinition);
1152
Chris Lattner5f9e2722011-07-23 10:55:15 +00001153 StringRef MangledName = getMangledName(GD);
Benjamin Kramer7e423922012-03-24 18:22:12 +00001154 DeferredDecls.erase(MangledName);
Nick Lewyckydce67a72011-07-18 05:26:13 +00001155 EmitGlobalDefinition(InlineDefinition);
Daniel Dunbar73241df2009-02-13 21:18:01 +00001156 return;
Nick Lewyckydce67a72011-07-18 05:26:13 +00001157 }
Daniel Dunbar02698712009-02-13 20:29:50 +00001158 } else {
1159 const VarDecl *VD = cast<VarDecl>(Global);
Daniel Dunbarbd012ff2008-07-29 23:18:29 +00001160 assert(VD->isFileVarDecl() && "Cannot emit local var decl as global.");
1161
Douglas Gregora9a55c02010-02-06 05:15:45 +00001162 if (VD->isThisDeclarationADefinition() != VarDecl::Definition)
Douglas Gregorb6c8c8b2009-04-21 17:11:58 +00001163 return;
Nate Begeman4c13b7a2008-04-20 06:29:50 +00001164 }
1165
Chris Lattner67b00522009-03-21 09:44:56 +00001166 // Defer code generation when possible if this is a static definition, inline
1167 // function etc. These we only want to emit if they are used.
Chris Lattner4357a822010-04-13 17:39:09 +00001168 if (!MayDeferGeneration(Global)) {
1169 // Emit the definition if it can't be deferred.
1170 EmitGlobalDefinition(GD);
Daniel Dunbarbd012ff2008-07-29 23:18:29 +00001171 return;
1172 }
John McCallbf40cb52010-07-15 23:40:35 +00001173
1174 // If we're deferring emission of a C++ variable with an
1175 // initializer, remember the order in which it appeared in the file.
David Blaikie4e4d0842012-03-11 07:00:24 +00001176 if (getLangOpts().CPlusPlus && isa<VarDecl>(Global) &&
John McCallbf40cb52010-07-15 23:40:35 +00001177 cast<VarDecl>(Global)->hasInit()) {
1178 DelayedCXXInitPosition[Global] = CXXGlobalInits.size();
1179 CXXGlobalInits.push_back(0);
1180 }
Chris Lattner4357a822010-04-13 17:39:09 +00001181
1182 // If the value has already been used, add it directly to the
1183 // DeferredDeclsToEmit list.
Chris Lattner5f9e2722011-07-23 10:55:15 +00001184 StringRef MangledName = getMangledName(GD);
Chris Lattner4357a822010-04-13 17:39:09 +00001185 if (GetGlobalValue(MangledName))
1186 DeferredDeclsToEmit.push_back(GD);
1187 else {
1188 // Otherwise, remember that we saw a deferred decl with this name. The
1189 // first use of the mangled name will cause it to move into
1190 // DeferredDeclsToEmit.
1191 DeferredDecls[MangledName] = GD;
1192 }
Nate Begeman4c13b7a2008-04-20 06:29:50 +00001193}
1194
Rafael Espindolaa411d2f2011-10-26 20:41:06 +00001195namespace {
1196 struct FunctionIsDirectlyRecursive :
1197 public RecursiveASTVisitor<FunctionIsDirectlyRecursive> {
1198 const StringRef Name;
Rafael Espindolabcf6b982011-12-19 14:41:01 +00001199 const Builtin::Context &BI;
Rafael Espindolaa411d2f2011-10-26 20:41:06 +00001200 bool Result;
Rafael Espindolabcf6b982011-12-19 14:41:01 +00001201 FunctionIsDirectlyRecursive(StringRef N, const Builtin::Context &C) :
1202 Name(N), BI(C), Result(false) {
Rafael Espindolaa411d2f2011-10-26 20:41:06 +00001203 }
1204 typedef RecursiveASTVisitor<FunctionIsDirectlyRecursive> Base;
1205
1206 bool TraverseCallExpr(CallExpr *E) {
Rafael Espindolabcf6b982011-12-19 14:41:01 +00001207 const FunctionDecl *FD = E->getDirectCallee();
1208 if (!FD)
Rafael Espindolaa411d2f2011-10-26 20:41:06 +00001209 return true;
Rafael Espindolabcf6b982011-12-19 14:41:01 +00001210 AsmLabelAttr *Attr = FD->getAttr<AsmLabelAttr>();
1211 if (Attr && Name == Attr->getLabel()) {
1212 Result = true;
1213 return false;
1214 }
1215 unsigned BuiltinID = FD->getBuiltinID();
1216 if (!BuiltinID)
Rafael Espindolaa411d2f2011-10-26 20:41:06 +00001217 return true;
Nick Lewyckyf6b56372012-01-18 03:41:19 +00001218 StringRef BuiltinName = BI.GetName(BuiltinID);
1219 if (BuiltinName.startswith("__builtin_") &&
1220 Name == BuiltinName.slice(strlen("__builtin_"), StringRef::npos)) {
Rafael Espindolaa411d2f2011-10-26 20:41:06 +00001221 Result = true;
1222 return false;
1223 }
1224 return true;
1225 }
1226 };
1227}
1228
Rafael Espindolabcf6b982011-12-19 14:41:01 +00001229// isTriviallyRecursive - Check if this function calls another
1230// decl that, because of the asm attribute or the other decl being a builtin,
1231// ends up pointing to itself.
Rafael Espindolaa411d2f2011-10-26 20:41:06 +00001232bool
Rafael Espindolabcf6b982011-12-19 14:41:01 +00001233CodeGenModule::isTriviallyRecursive(const FunctionDecl *FD) {
1234 StringRef Name;
1235 if (getCXXABI().getMangleContext().shouldMangleDeclName(FD)) {
Nick Lewycky22afacc2012-01-18 01:50:13 +00001236 // asm labels are a special kind of mangling we have to support.
Rafael Espindolabcf6b982011-12-19 14:41:01 +00001237 AsmLabelAttr *Attr = FD->getAttr<AsmLabelAttr>();
1238 if (!Attr)
1239 return false;
1240 Name = Attr->getLabel();
1241 } else {
1242 Name = FD->getName();
1243 }
Rafael Espindolaa411d2f2011-10-26 20:41:06 +00001244
Rafael Espindolabcf6b982011-12-19 14:41:01 +00001245 FunctionIsDirectlyRecursive Walker(Name, Context.BuiltinInfo);
1246 Walker.TraverseFunctionDecl(const_cast<FunctionDecl*>(FD));
Rafael Espindolaa411d2f2011-10-26 20:41:06 +00001247 return Walker.Result;
1248}
1249
1250bool
Peter Collingbourne144a31f2013-06-05 17:49:37 +00001251CodeGenModule::shouldEmitFunction(GlobalDecl GD) {
1252 if (getFunctionLinkage(GD) != llvm::Function::AvailableExternallyLinkage)
Rafael Espindolaa411d2f2011-10-26 20:41:06 +00001253 return true;
Peter Collingbourne144a31f2013-06-05 17:49:37 +00001254 const FunctionDecl *F = cast<FunctionDecl>(GD.getDecl());
Rafael Espindolacc4889f2011-10-28 20:43:56 +00001255 if (CodeGenOpts.OptimizationLevel == 0 &&
Michael J. Spenceradc6cbf2012-06-18 07:00:48 +00001256 !F->hasAttr<AlwaysInlineAttr>() && !F->hasAttr<ForceInlineAttr>())
Rafael Espindolaa411d2f2011-10-26 20:41:06 +00001257 return false;
1258 // PR9614. Avoid cases where the source code is lying to us. An available
1259 // externally function should have an equivalent function somewhere else,
1260 // but a function that calls itself is clearly not equivalent to the real
1261 // implementation.
1262 // This happens in glibc's btowc and in some configure checks.
Rafael Espindolabcf6b982011-12-19 14:41:01 +00001263 return !isTriviallyRecursive(F);
Rafael Espindolaa411d2f2011-10-26 20:41:06 +00001264}
1265
Adrian Prantl0a050f72013-05-09 23:16:27 +00001266/// If the type for the method's class was generated by
1267/// CGDebugInfo::createContextChain(), the cache contains only a
1268/// limited DIType without any declarations. Since EmitFunctionStart()
1269/// needs to find the canonical declaration for each method, we need
1270/// to construct the complete type prior to emitting the method.
1271void CodeGenModule::CompleteDIClassType(const CXXMethodDecl* D) {
1272 if (!D->isInstance())
1273 return;
1274
1275 if (CGDebugInfo *DI = getModuleDebugInfo())
1276 if (getCodeGenOpts().getDebugInfo() >= CodeGenOptions::LimitedDebugInfo) {
1277 const PointerType *ThisPtr =
1278 cast<PointerType>(D->getThisType(getContext()));
1279 DI->getOrCreateRecordType(ThisPtr->getPointeeType(), D->getLocation());
1280 }
1281}
1282
Chris Lattnerb4880ba2009-05-12 21:21:08 +00001283void CodeGenModule::EmitGlobalDefinition(GlobalDecl GD) {
Anders Carlsson4a6835e2009-09-10 23:38:47 +00001284 const ValueDecl *D = cast<ValueDecl>(GD.getDecl());
Mike Stump1eb44332009-09-09 15:08:12 +00001285
Dan Gohmancb421fa2010-04-19 16:39:44 +00001286 PrettyStackTraceDecl CrashInfo(const_cast<ValueDecl *>(D), D->getLocation(),
Anders Carlsson8e2efcc2009-10-27 14:32:27 +00001287 Context.getSourceManager(),
1288 "Generating code for declaration");
1289
Peter Collingbourne144a31f2013-06-05 17:49:37 +00001290 if (isa<FunctionDecl>(D)) {
Douglas Gregor44eac332010-07-13 06:02:28 +00001291 // At -O0, don't generate IR for functions with available_externally
1292 // linkage.
Peter Collingbourne144a31f2013-06-05 17:49:37 +00001293 if (!shouldEmitFunction(GD))
Douglas Gregor44eac332010-07-13 06:02:28 +00001294 return;
Anders Carlsson7270ee42010-03-23 04:31:31 +00001295
Douglas Gregor44eac332010-07-13 06:02:28 +00001296 if (const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) {
Adrian Prantl0a050f72013-05-09 23:16:27 +00001297 CompleteDIClassType(Method);
Eli Friedman7dcdf5b2011-05-06 17:27:27 +00001298 // Make sure to emit the definition(s) before we emit the thunks.
1299 // This is necessary for the generation of certain thunks.
1300 if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(Method))
1301 EmitCXXConstructor(CD, GD.getCtorType());
1302 else if (const CXXDestructorDecl *DD =dyn_cast<CXXDestructorDecl>(Method))
1303 EmitCXXDestructor(DD, GD.getDtorType());
1304 else
1305 EmitGlobalFunctionDefinition(GD);
1306
Douglas Gregor44eac332010-07-13 06:02:28 +00001307 if (Method->isVirtual())
1308 getVTables().EmitThunks(GD);
1309
Eli Friedman7dcdf5b2011-05-06 17:27:27 +00001310 return;
Douglas Gregor44eac332010-07-13 06:02:28 +00001311 }
Chris Lattnerb5e81562010-04-13 17:57:11 +00001312
Chris Lattnerb5e81562010-04-13 17:57:11 +00001313 return EmitGlobalFunctionDefinition(GD);
Douglas Gregor44eac332010-07-13 06:02:28 +00001314 }
Chris Lattnerb5e81562010-04-13 17:57:11 +00001315
1316 if (const VarDecl *VD = dyn_cast<VarDecl>(D))
1317 return EmitGlobalVarDefinition(VD);
Chris Lattner4357a822010-04-13 17:39:09 +00001318
David Blaikieb219cfc2011-09-23 05:06:16 +00001319 llvm_unreachable("Invalid argument to EmitGlobalDefinition()");
Daniel Dunbarbd012ff2008-07-29 23:18:29 +00001320}
1321
Chris Lattner74391b42009-03-22 21:03:39 +00001322/// GetOrCreateLLVMFunction - If the specified mangled name is not in the
1323/// module, create and return an llvm Function with the specified type. If there
1324/// is something in the module with the specified name, return it potentially
1325/// bitcasted to the right type.
1326///
1327/// If D is non-null, it specifies a decl that correspond to this. This is used
1328/// to set the attributes on the function when it is first created.
John McCallf746aa62010-03-19 23:29:14 +00001329llvm::Constant *
Chris Lattner5f9e2722011-07-23 10:55:15 +00001330CodeGenModule::GetOrCreateLLVMFunction(StringRef MangledName,
Chris Lattner2acc6e32011-07-18 04:24:23 +00001331 llvm::Type *Ty,
John McCallf85e1932011-06-15 23:02:42 +00001332 GlobalDecl D, bool ForVTable,
Bill Wendlingc4c62fd2013-01-31 00:30:05 +00001333 llvm::AttributeSet ExtraAttrs) {
Chris Lattner0558e792009-03-21 09:25:43 +00001334 // Lookup the entry, lazily creating it if necessary.
John McCallf746aa62010-03-19 23:29:14 +00001335 llvm::GlobalValue *Entry = GetGlobalValue(MangledName);
Chris Lattner0558e792009-03-21 09:25:43 +00001336 if (Entry) {
Benjamin Kramerd48bcb22012-08-22 15:37:55 +00001337 if (WeakRefReferences.erase(Entry)) {
Rafael Espindola6a836702010-03-04 18:17:24 +00001338 const FunctionDecl *FD = cast_or_null<FunctionDecl>(D.getDecl());
1339 if (FD && !FD->hasAttr<WeakAttr>())
Anders Carlsson7270ee42010-03-23 04:31:31 +00001340 Entry->setLinkage(llvm::Function::ExternalLinkage);
Rafael Espindola6a836702010-03-04 18:17:24 +00001341 }
1342
Chris Lattner0558e792009-03-21 09:25:43 +00001343 if (Entry->getType()->getElementType() == Ty)
1344 return Entry;
Mike Stump1eb44332009-09-09 15:08:12 +00001345
Chris Lattner0558e792009-03-21 09:25:43 +00001346 // Make sure the result is of the correct type.
Chris Lattner9cbe4f02011-07-09 17:41:47 +00001347 return llvm::ConstantExpr::getBitCast(Entry, Ty->getPointerTo());
Chris Lattner0558e792009-03-21 09:25:43 +00001348 }
Mike Stump1eb44332009-09-09 15:08:12 +00001349
Eli Friedman654ad402009-11-09 05:07:37 +00001350 // This function doesn't have a complete type (for example, the return
1351 // type is an incomplete struct). Use a fake type instead, and make
1352 // sure not to try to set attributes.
1353 bool IsIncompleteFunction = false;
John McCall784f2112010-04-28 00:00:30 +00001354
Chris Lattner2acc6e32011-07-18 04:24:23 +00001355 llvm::FunctionType *FTy;
John McCall784f2112010-04-28 00:00:30 +00001356 if (isa<llvm::FunctionType>(Ty)) {
1357 FTy = cast<llvm::FunctionType>(Ty);
1358 } else {
John McCall0774cb82011-05-15 01:53:33 +00001359 FTy = llvm::FunctionType::get(VoidTy, false);
Eli Friedman654ad402009-11-09 05:07:37 +00001360 IsIncompleteFunction = true;
1361 }
Chris Lattnerbcaedae2010-06-30 19:14:05 +00001362
John McCall784f2112010-04-28 00:00:30 +00001363 llvm::Function *F = llvm::Function::Create(FTy,
Eli Friedman654ad402009-11-09 05:07:37 +00001364 llvm::Function::ExternalLinkage,
John McCallf746aa62010-03-19 23:29:14 +00001365 MangledName, &getModule());
1366 assert(F->getName() == MangledName && "name was uniqued!");
Eli Friedman654ad402009-11-09 05:07:37 +00001367 if (D.getDecl())
Anders Carlssonb2bcf1c2010-02-06 02:44:09 +00001368 SetFunctionAttributes(D, F, IsIncompleteFunction);
Bill Wendlingc4c62fd2013-01-31 00:30:05 +00001369 if (ExtraAttrs.hasAttributes(llvm::AttributeSet::FunctionIndex)) {
1370 llvm::AttrBuilder B(ExtraAttrs, llvm::AttributeSet::FunctionIndex);
Bill Wendling909b6de2013-01-23 00:21:06 +00001371 F->addAttributes(llvm::AttributeSet::FunctionIndex,
1372 llvm::AttributeSet::get(VMContext,
1373 llvm::AttributeSet::FunctionIndex,
1374 B));
1375 }
Eli Friedman654ad402009-11-09 05:07:37 +00001376
Chris Lattner67b00522009-03-21 09:44:56 +00001377 // This is the first use or definition of a mangled name. If there is a
1378 // deferred decl with this name, remember that we need to emit it at the end
1379 // of the file.
John McCallf746aa62010-03-19 23:29:14 +00001380 llvm::StringMap<GlobalDecl>::iterator DDI = DeferredDecls.find(MangledName);
Chris Lattner67b00522009-03-21 09:44:56 +00001381 if (DDI != DeferredDecls.end()) {
1382 // Move the potentially referenced deferred decl to the DeferredDeclsToEmit
1383 // list, and remove it from DeferredDecls (since we don't need it anymore).
1384 DeferredDeclsToEmit.push_back(DDI->second);
1385 DeferredDecls.erase(DDI);
John McCallbfdcdc82010-12-15 04:00:32 +00001386
1387 // Otherwise, there are cases we have to worry about where we're
1388 // using a declaration for which we must emit a definition but where
1389 // we might not find a top-level definition:
1390 // - member functions defined inline in their classes
1391 // - friend functions defined inline in some class
1392 // - special member functions with implicit definitions
1393 // If we ever change our AST traversal to walk into class methods,
1394 // this will be unnecessary.
Anders Carlsson1faa89f2011-02-05 04:35:53 +00001395 //
1396 // We also don't emit a definition for a function if it's going to be an entry
1397 // in a vtable, unless it's already marked as used.
David Blaikie4e4d0842012-03-11 07:00:24 +00001398 } else if (getLangOpts().CPlusPlus && D.getDecl()) {
John McCallbfdcdc82010-12-15 04:00:32 +00001399 // Look for a declaration that's lexically in a record.
1400 const FunctionDecl *FD = cast<FunctionDecl>(D.getDecl());
Eli Friedmanb135f0f2012-07-02 21:05:30 +00001401 FD = FD->getMostRecentDecl();
John McCallbfdcdc82010-12-15 04:00:32 +00001402 do {
1403 if (isa<CXXRecordDecl>(FD->getLexicalDeclContext())) {
Anders Carlsson1faa89f2011-02-05 04:35:53 +00001404 if (FD->isImplicit() && !ForVTable) {
John McCallbfdcdc82010-12-15 04:00:32 +00001405 assert(FD->isUsed() && "Sema didn't mark implicit function as used!");
Douglas Gregora29bf412011-02-09 02:03:05 +00001406 DeferredDeclsToEmit.push_back(D.getWithDecl(FD));
John McCallbfdcdc82010-12-15 04:00:32 +00001407 break;
Sean Hunt10620eb2011-05-06 20:44:56 +00001408 } else if (FD->doesThisDeclarationHaveABody()) {
Douglas Gregora29bf412011-02-09 02:03:05 +00001409 DeferredDeclsToEmit.push_back(D.getWithDecl(FD));
John McCallbfdcdc82010-12-15 04:00:32 +00001410 break;
1411 }
Rafael Espindola7b9a5aa2010-03-02 21:28:26 +00001412 }
Douglas Gregoref96ee02012-01-14 16:38:05 +00001413 FD = FD->getPreviousDecl();
John McCallbfdcdc82010-12-15 04:00:32 +00001414 } while (FD);
Chris Lattner67b00522009-03-21 09:44:56 +00001415 }
Mike Stump1eb44332009-09-09 15:08:12 +00001416
John McCall784f2112010-04-28 00:00:30 +00001417 // Make sure the result is of the requested type.
1418 if (!IsIncompleteFunction) {
1419 assert(F->getType()->getElementType() == Ty);
1420 return F;
1421 }
1422
Chris Lattner9cbe4f02011-07-09 17:41:47 +00001423 llvm::Type *PTy = llvm::PointerType::getUnqual(Ty);
John McCall784f2112010-04-28 00:00:30 +00001424 return llvm::ConstantExpr::getBitCast(F, PTy);
Chris Lattner0558e792009-03-21 09:25:43 +00001425}
1426
Chris Lattner74391b42009-03-22 21:03:39 +00001427/// GetAddrOfFunction - Return the address of the given function. If Ty is
1428/// non-null, then this function will use the specified type if it has to
1429/// create it (this occurs when we see a definition of the function).
Chris Lattnerb4880ba2009-05-12 21:21:08 +00001430llvm::Constant *CodeGenModule::GetAddrOfFunction(GlobalDecl GD,
Chris Lattner2acc6e32011-07-18 04:24:23 +00001431 llvm::Type *Ty,
Anders Carlsson1faa89f2011-02-05 04:35:53 +00001432 bool ForVTable) {
Chris Lattner74391b42009-03-22 21:03:39 +00001433 // If there was no specific requested type, just convert it now.
1434 if (!Ty)
Anders Carlsson4a6835e2009-09-10 23:38:47 +00001435 Ty = getTypes().ConvertType(cast<ValueDecl>(GD.getDecl())->getType());
Chris Lattnerbcaedae2010-06-30 19:14:05 +00001436
Chris Lattner5f9e2722011-07-23 10:55:15 +00001437 StringRef MangledName = getMangledName(GD);
Anders Carlsson1faa89f2011-02-05 04:35:53 +00001438 return GetOrCreateLLVMFunction(MangledName, Ty, GD, ForVTable);
Chris Lattner74391b42009-03-22 21:03:39 +00001439}
Eli Friedman77ba7082008-05-30 19:50:47 +00001440
Chris Lattner74391b42009-03-22 21:03:39 +00001441/// CreateRuntimeFunction - Create a new runtime function with the specified
1442/// type and name.
1443llvm::Constant *
Chris Lattner2acc6e32011-07-18 04:24:23 +00001444CodeGenModule::CreateRuntimeFunction(llvm::FunctionType *FTy,
Chris Lattner5f9e2722011-07-23 10:55:15 +00001445 StringRef Name,
Bill Wendlingc4c62fd2013-01-31 00:30:05 +00001446 llvm::AttributeSet ExtraAttrs) {
John McCallbd7370a2013-02-28 19:01:20 +00001447 llvm::Constant *C
1448 = GetOrCreateLLVMFunction(Name, FTy, GlobalDecl(), /*ForVTable=*/false,
1449 ExtraAttrs);
1450 if (llvm::Function *F = dyn_cast<llvm::Function>(C))
1451 if (F->empty())
1452 F->setCallingConv(getRuntimeCC());
1453 return C;
Chris Lattner74391b42009-03-22 21:03:39 +00001454}
Daniel Dunbarbd012ff2008-07-29 23:18:29 +00001455
Richard Smitha9b21d22012-02-17 06:48:11 +00001456/// isTypeConstant - Determine whether an object of this type can be emitted
1457/// as a constant.
1458///
1459/// If ExcludeCtor is true, the duration when the object's constructor runs
1460/// will not be considered. The caller will need to verify that the object is
1461/// not written to during its construction.
1462bool CodeGenModule::isTypeConstant(QualType Ty, bool ExcludeCtor) {
1463 if (!Ty.isConstant(Context) && !Ty->isReferenceType())
Eli Friedman20e098b2009-12-11 21:23:03 +00001464 return false;
Richard Smitha9b21d22012-02-17 06:48:11 +00001465
David Blaikie4e4d0842012-03-11 07:00:24 +00001466 if (Context.getLangOpts().CPlusPlus) {
Richard Smitha9b21d22012-02-17 06:48:11 +00001467 if (const CXXRecordDecl *Record
1468 = Context.getBaseElementType(Ty)->getAsCXXRecordDecl())
1469 return ExcludeCtor && !Record->hasMutableFields() &&
1470 Record->hasTrivialDestructor();
Eli Friedman20e098b2009-12-11 21:23:03 +00001471 }
Richard Smitha9b21d22012-02-17 06:48:11 +00001472
Eli Friedman20e098b2009-12-11 21:23:03 +00001473 return true;
1474}
1475
Chris Lattner74391b42009-03-22 21:03:39 +00001476/// GetOrCreateLLVMGlobal - If the specified mangled name is not in the module,
1477/// create and return an llvm GlobalVariable with the specified type. If there
1478/// is something in the module with the specified name, return it potentially
1479/// bitcasted to the right type.
1480///
1481/// If D is non-null, it specifies a decl that correspond to this. This is used
1482/// to set the attributes on the global when it is first created.
John McCallf746aa62010-03-19 23:29:14 +00001483llvm::Constant *
Chris Lattner5f9e2722011-07-23 10:55:15 +00001484CodeGenModule::GetOrCreateLLVMGlobal(StringRef MangledName,
Chris Lattner2acc6e32011-07-18 04:24:23 +00001485 llvm::PointerType *Ty,
Rafael Espindolac532b502011-01-18 21:07:57 +00001486 const VarDecl *D,
1487 bool UnnamedAddr) {
Daniel Dunbar3c827a72008-08-05 23:31:02 +00001488 // Lookup the entry, lazily creating it if necessary.
John McCallf746aa62010-03-19 23:29:14 +00001489 llvm::GlobalValue *Entry = GetGlobalValue(MangledName);
Chris Lattner99b53612009-03-21 08:03:33 +00001490 if (Entry) {
Benjamin Kramerd48bcb22012-08-22 15:37:55 +00001491 if (WeakRefReferences.erase(Entry)) {
Rafael Espindola6a836702010-03-04 18:17:24 +00001492 if (D && !D->hasAttr<WeakAttr>())
Anders Carlsson7270ee42010-03-23 04:31:31 +00001493 Entry->setLinkage(llvm::Function::ExternalLinkage);
Rafael Espindola6a836702010-03-04 18:17:24 +00001494 }
1495
Rafael Espindolac532b502011-01-18 21:07:57 +00001496 if (UnnamedAddr)
1497 Entry->setUnnamedAddr(true);
1498
Chris Lattner74391b42009-03-22 21:03:39 +00001499 if (Entry->getType() == Ty)
Chris Lattner570585c2009-03-21 09:16:30 +00001500 return Entry;
Mike Stump1eb44332009-09-09 15:08:12 +00001501
Chris Lattner99b53612009-03-21 08:03:33 +00001502 // Make sure the result is of the correct type.
Owen Anderson3c4972d2009-07-29 18:54:39 +00001503 return llvm::ConstantExpr::getBitCast(Entry, Ty);
Daniel Dunbar49988882009-01-13 02:25:00 +00001504 }
Mike Stump1eb44332009-09-09 15:08:12 +00001505
Chris Lattner67b00522009-03-21 09:44:56 +00001506 // This is the first use or definition of a mangled name. If there is a
1507 // deferred decl with this name, remember that we need to emit it at the end
1508 // of the file.
John McCallf746aa62010-03-19 23:29:14 +00001509 llvm::StringMap<GlobalDecl>::iterator DDI = DeferredDecls.find(MangledName);
Chris Lattner67b00522009-03-21 09:44:56 +00001510 if (DDI != DeferredDecls.end()) {
1511 // Move the potentially referenced deferred decl to the DeferredDeclsToEmit
1512 // list, and remove it from DeferredDecls (since we don't need it anymore).
1513 DeferredDeclsToEmit.push_back(DDI->second);
1514 DeferredDecls.erase(DDI);
1515 }
Mike Stump1eb44332009-09-09 15:08:12 +00001516
Peter Collingbourne4dc34eb2012-05-20 21:08:35 +00001517 unsigned AddrSpace = GetGlobalVarAddressSpace(D, Ty->getAddressSpace());
Mike Stump1eb44332009-09-09 15:08:12 +00001518 llvm::GlobalVariable *GV =
1519 new llvm::GlobalVariable(getModule(), Ty->getElementType(), false,
Chris Lattner99b53612009-03-21 08:03:33 +00001520 llvm::GlobalValue::ExternalLinkage,
John McCallf746aa62010-03-19 23:29:14 +00001521 0, MangledName, 0,
Hans Wennborg5e2d5de2012-06-23 11:51:46 +00001522 llvm::GlobalVariable::NotThreadLocal, AddrSpace);
Chris Lattner99b53612009-03-21 08:03:33 +00001523
1524 // Handle things which are present even on external declarations.
Chris Lattner74391b42009-03-22 21:03:39 +00001525 if (D) {
Mike Stumpf5408fe2009-05-16 07:57:57 +00001526 // FIXME: This code is overly simple and should be merged with other global
1527 // handling.
Richard Smitha9b21d22012-02-17 06:48:11 +00001528 GV->setConstant(isTypeConstant(D->getType(), false));
Chris Lattner99b53612009-03-21 08:03:33 +00001529
John McCall110e8e52010-10-29 22:22:43 +00001530 // Set linkage and visibility in case we never see a definition.
Rafael Espindola2beda122013-02-27 02:15:29 +00001531 LinkageInfo LV = D->getLinkageAndVisibility();
Rafael Espindolaf127eb82013-02-27 02:56:45 +00001532 if (LV.getLinkage() != ExternalLinkage) {
John McCall15e310a2011-02-19 02:53:41 +00001533 // Don't set internal linkage on declarations.
John McCall110e8e52010-10-29 22:22:43 +00001534 } else {
1535 if (D->hasAttr<DLLImportAttr>())
1536 GV->setLinkage(llvm::GlobalValue::DLLImportLinkage);
Douglas Gregor0a0d2b12011-03-23 00:50:03 +00001537 else if (D->hasAttr<WeakAttr>() || D->isWeakImported())
John McCall110e8e52010-10-29 22:22:43 +00001538 GV->setLinkage(llvm::GlobalValue::ExternalWeakLinkage);
Chris Lattner99b53612009-03-21 08:03:33 +00001539
John McCallaf146032010-10-30 11:50:40 +00001540 // Set visibility on a declaration only if it's explicit.
Rafael Espindolaf127eb82013-02-27 02:56:45 +00001541 if (LV.isVisibilityExplicit())
1542 GV->setVisibility(GetLLVMVisibility(LV.getVisibility()));
John McCall110e8e52010-10-29 22:22:43 +00001543 }
Eli Friedman56ebe502009-04-19 21:05:03 +00001544
Richard Smithb80a16e2013-04-19 16:42:07 +00001545 if (D->getTLSKind()) {
Richard Smithdb4f61f2013-04-22 08:06:17 +00001546 if (D->getTLSKind() == VarDecl::TLS_Dynamic)
1547 CXXThreadLocals.push_back(std::make_pair(D, GV));
Hans Wennborgde981f32012-06-28 08:01:44 +00001548 setTLSMode(GV, *D);
Richard Smithb80a16e2013-04-19 16:42:07 +00001549 }
Chris Lattner74391b42009-03-22 21:03:39 +00001550 }
Mike Stump1eb44332009-09-09 15:08:12 +00001551
Peter Collingbourne4dc34eb2012-05-20 21:08:35 +00001552 if (AddrSpace != Ty->getAddressSpace())
1553 return llvm::ConstantExpr::getBitCast(GV, Ty);
1554 else
1555 return GV;
Daniel Dunbarbd012ff2008-07-29 23:18:29 +00001556}
1557
Chris Lattner74391b42009-03-22 21:03:39 +00001558
Anders Carlsson3bd62022011-01-29 18:20:20 +00001559llvm::GlobalVariable *
Chris Lattner5f9e2722011-07-23 10:55:15 +00001560CodeGenModule::CreateOrReplaceCXXRuntimeVariable(StringRef Name,
Chris Lattner2acc6e32011-07-18 04:24:23 +00001561 llvm::Type *Ty,
Anders Carlsson3bd62022011-01-29 18:20:20 +00001562 llvm::GlobalValue::LinkageTypes Linkage) {
1563 llvm::GlobalVariable *GV = getModule().getNamedGlobal(Name);
1564 llvm::GlobalVariable *OldGV = 0;
1565
1566
1567 if (GV) {
1568 // Check if the variable has the right type.
1569 if (GV->getType()->getElementType() == Ty)
1570 return GV;
1571
1572 // Because C++ name mangling, the only way we can end up with an already
1573 // existing global with the same name is if it has been declared extern "C".
Nico Weberc5f80462012-10-11 10:13:44 +00001574 assert(GV->isDeclaration() && "Declaration has wrong type!");
Anders Carlsson3bd62022011-01-29 18:20:20 +00001575 OldGV = GV;
1576 }
1577
1578 // Create a new variable.
1579 GV = new llvm::GlobalVariable(getModule(), Ty, /*isConstant=*/true,
1580 Linkage, 0, Name);
1581
1582 if (OldGV) {
1583 // Replace occurrences of the old variable if needed.
1584 GV->takeName(OldGV);
1585
1586 if (!OldGV->use_empty()) {
1587 llvm::Constant *NewPtrForOldDecl =
1588 llvm::ConstantExpr::getBitCast(GV, OldGV->getType());
1589 OldGV->replaceAllUsesWith(NewPtrForOldDecl);
1590 }
1591
1592 OldGV->eraseFromParent();
1593 }
1594
1595 return GV;
1596}
1597
Chris Lattner74391b42009-03-22 21:03:39 +00001598/// GetAddrOfGlobalVar - Return the llvm::Constant for the address of the
1599/// given global variable. If Ty is non-null and if the global doesn't exist,
Eric Christopher0ff258b2012-04-16 23:55:04 +00001600/// then it will be created with the specified type instead of whatever the
Chris Lattner74391b42009-03-22 21:03:39 +00001601/// normal requested type would be.
1602llvm::Constant *CodeGenModule::GetAddrOfGlobalVar(const VarDecl *D,
Chris Lattner2acc6e32011-07-18 04:24:23 +00001603 llvm::Type *Ty) {
Chris Lattner74391b42009-03-22 21:03:39 +00001604 assert(D->hasGlobalStorage() && "Not a global variable");
1605 QualType ASTTy = D->getType();
1606 if (Ty == 0)
1607 Ty = getTypes().ConvertTypeForMem(ASTTy);
Mike Stump1eb44332009-09-09 15:08:12 +00001608
Chris Lattner2acc6e32011-07-18 04:24:23 +00001609 llvm::PointerType *PTy =
Peter Collingbourne207f4d82011-03-18 22:38:29 +00001610 llvm::PointerType::get(Ty, getContext().getTargetAddressSpace(ASTTy));
John McCallf746aa62010-03-19 23:29:14 +00001611
Chris Lattner5f9e2722011-07-23 10:55:15 +00001612 StringRef MangledName = getMangledName(D);
John McCallf746aa62010-03-19 23:29:14 +00001613 return GetOrCreateLLVMGlobal(MangledName, PTy, D);
Chris Lattner74391b42009-03-22 21:03:39 +00001614}
1615
1616/// CreateRuntimeVariable - Create a new runtime global variable with the
1617/// specified type and name.
1618llvm::Constant *
Chris Lattner2acc6e32011-07-18 04:24:23 +00001619CodeGenModule::CreateRuntimeVariable(llvm::Type *Ty,
Chris Lattner5f9e2722011-07-23 10:55:15 +00001620 StringRef Name) {
John McCall1de4d4e2011-04-07 08:22:57 +00001621 return GetOrCreateLLVMGlobal(Name, llvm::PointerType::getUnqual(Ty), 0,
Rafael Espindolac532b502011-01-18 21:07:57 +00001622 true);
Chris Lattner74391b42009-03-22 21:03:39 +00001623}
1624
Daniel Dunbar03f5ad92009-04-15 22:08:45 +00001625void CodeGenModule::EmitTentativeDefinition(const VarDecl *D) {
1626 assert(!D->getInit() && "Cannot emit definite definitions here!");
1627
Douglas Gregor7520bd12009-04-21 19:28:58 +00001628 if (MayDeferGeneration(D)) {
1629 // If we have not seen a reference to this variable yet, place it
1630 // into the deferred declarations table to be emitted if needed
1631 // later.
Chris Lattner5f9e2722011-07-23 10:55:15 +00001632 StringRef MangledName = getMangledName(D);
John McCallf746aa62010-03-19 23:29:14 +00001633 if (!GetGlobalValue(MangledName)) {
Anders Carlsson555b4bb2009-09-10 23:43:36 +00001634 DeferredDecls[MangledName] = D;
Daniel Dunbar03f5ad92009-04-15 22:08:45 +00001635 return;
Douglas Gregor7520bd12009-04-21 19:28:58 +00001636 }
1637 }
1638
1639 // The tentative definition is the only definition.
Daniel Dunbar03f5ad92009-04-15 22:08:45 +00001640 EmitGlobalVarDefinition(D);
1641}
1642
Chris Lattner2acc6e32011-07-18 04:24:23 +00001643CharUnits CodeGenModule::GetTargetTypeStoreSize(llvm::Type *Ty) const {
Ken Dyck06f486e2011-01-18 02:01:14 +00001644 return Context.toCharUnitsFromBits(
Micah Villmow25a6a842012-10-08 16:25:52 +00001645 TheDataLayout.getTypeStoreSizeInBits(Ty));
Ken Dyck687cc4a2010-01-26 13:48:07 +00001646}
1647
Peter Collingbourne4dc34eb2012-05-20 21:08:35 +00001648unsigned CodeGenModule::GetGlobalVarAddressSpace(const VarDecl *D,
1649 unsigned AddrSpace) {
1650 if (LangOpts.CUDA && CodeGenOpts.CUDAIsDevice) {
1651 if (D->hasAttr<CUDAConstantAttr>())
1652 AddrSpace = getContext().getTargetAddressSpace(LangAS::cuda_constant);
1653 else if (D->hasAttr<CUDASharedAttr>())
1654 AddrSpace = getContext().getTargetAddressSpace(LangAS::cuda_shared);
1655 else
1656 AddrSpace = getContext().getTargetAddressSpace(LangAS::cuda_device);
1657 }
1658
1659 return AddrSpace;
1660}
1661
Richard Smith00249372013-04-06 05:00:46 +00001662template<typename SomeDecl>
1663void CodeGenModule::MaybeHandleStaticInExternC(const SomeDecl *D,
1664 llvm::GlobalValue *GV) {
1665 if (!getLangOpts().CPlusPlus)
1666 return;
1667
1668 // Must have 'used' attribute, or else inline assembly can't rely on
1669 // the name existing.
1670 if (!D->template hasAttr<UsedAttr>())
1671 return;
1672
1673 // Must have internal linkage and an ordinary name.
Rafael Espindola181e3ec2013-05-13 00:12:11 +00001674 if (!D->getIdentifier() || D->getFormalLinkage() != InternalLinkage)
Richard Smith00249372013-04-06 05:00:46 +00001675 return;
1676
1677 // Must be in an extern "C" context. Entities declared directly within
1678 // a record are not extern "C" even if the record is in such a context.
Rafael Espindolad8ffd0b2013-05-05 20:15:21 +00001679 const SomeDecl *First = D->getFirstDeclaration();
1680 if (First->getDeclContext()->isRecord() || !First->isInExternCContext())
Richard Smith00249372013-04-06 05:00:46 +00001681 return;
1682
1683 // OK, this is an internal linkage entity inside an extern "C" linkage
1684 // specification. Make a note of that so we can give it the "expected"
1685 // mangled name if nothing else is using that name.
Richard Smith67972042013-04-06 07:07:44 +00001686 std::pair<StaticExternCMap::iterator, bool> R =
1687 StaticExternCValues.insert(std::make_pair(D->getIdentifier(), GV));
Richard Smith00249372013-04-06 05:00:46 +00001688
1689 // If we have multiple internal linkage entities with the same name
1690 // in extern "C" regions, none of them gets that name.
Richard Smith67972042013-04-06 07:07:44 +00001691 if (!R.second)
1692 R.first->second = 0;
Richard Smith00249372013-04-06 05:00:46 +00001693}
1694
Daniel Dunbarbd012ff2008-07-29 23:18:29 +00001695void CodeGenModule::EmitGlobalVarDefinition(const VarDecl *D) {
Chris Lattner8f32f712007-07-14 00:23:28 +00001696 llvm::Constant *Init = 0;
Eli Friedman77ba7082008-05-30 19:50:47 +00001697 QualType ASTTy = D->getType();
Richard Smith7ca48502012-02-13 22:16:19 +00001698 CXXRecordDecl *RD = ASTTy->getBaseElementTypeUnsafe()->getAsCXXRecordDecl();
1699 bool NeedsGlobalCtor = false;
1700 bool NeedsGlobalDtor = RD && !RD->hasTrivialDestructor();
Mike Stump1eb44332009-09-09 15:08:12 +00001701
Richard Smith2d6a5672012-01-14 04:30:29 +00001702 const VarDecl *InitDecl;
1703 const Expr *InitExpr = D->getAnyInitializer(InitDecl);
Sebastian Redl19b1a6e2012-02-25 20:51:20 +00001704
Anders Carlsson3bb92692010-01-26 17:43:42 +00001705 if (!InitExpr) {
Eli Friedmancd5f4aa2008-05-30 20:39:54 +00001706 // This is a tentative definition; tentative definitions are
Daniel Dunbar03f5ad92009-04-15 22:08:45 +00001707 // implicitly initialized with { 0 }.
1708 //
1709 // Note that tentative definitions are only emitted at the end of
1710 // a translation unit, so they should never have incomplete
1711 // type. In addition, EmitTentativeDefinition makes sure that we
1712 // never attempt to emit a tentative definition if a real one
1713 // exists. A use may still exists, however, so we still may need
1714 // to do a RAUW.
1715 assert(!ASTTy->isIncompleteType() && "Unexpected incomplete type");
Anders Carlssonb0d0ea02009-08-02 21:18:22 +00001716 Init = EmitNullConstant(D->getType());
Eli Friedman77ba7082008-05-30 19:50:47 +00001717 } else {
Richard Smith7c3e6152013-06-12 22:31:48 +00001718 initializedGlobalDecl = GlobalDecl(D);
1719 Init = EmitConstantInit(*InitDecl);
Sebastian Redl19b1a6e2012-02-25 20:51:20 +00001720
Fariborz Jahanian4904bf42012-06-26 16:06:38 +00001721 if (!Init) {
Anders Carlsson3bb92692010-01-26 17:43:42 +00001722 QualType T = InitExpr->getType();
Douglas Gregorc446d182010-05-05 20:15:55 +00001723 if (D->getType()->isReferenceType())
1724 T = D->getType();
Richard Smith2d6a5672012-01-14 04:30:29 +00001725
David Blaikie4e4d0842012-03-11 07:00:24 +00001726 if (getLangOpts().CPlusPlus) {
Anders Carlsson89ed31d2009-08-08 23:24:23 +00001727 Init = EmitNullConstant(T);
Richard Smith7ca48502012-02-13 22:16:19 +00001728 NeedsGlobalCtor = true;
Anders Carlsson89ed31d2009-08-08 23:24:23 +00001729 } else {
1730 ErrorUnsupported(D, "static initializer");
1731 Init = llvm::UndefValue::get(getTypes().ConvertType(T));
1732 }
John McCallbf40cb52010-07-15 23:40:35 +00001733 } else {
1734 // We don't need an initializer, so remove the entry for the delayed
Richard Smith7ca48502012-02-13 22:16:19 +00001735 // initializer position (just in case this entry was delayed) if we
1736 // also don't need to register a destructor.
David Blaikie4e4d0842012-03-11 07:00:24 +00001737 if (getLangOpts().CPlusPlus && !NeedsGlobalDtor)
John McCallbf40cb52010-07-15 23:40:35 +00001738 DelayedCXXInitPosition.erase(D);
Eli Friedman6e656f42009-02-20 01:18:21 +00001739 }
Eli Friedman77ba7082008-05-30 19:50:47 +00001740 }
Eli Friedman77ba7082008-05-30 19:50:47 +00001741
Chris Lattner2acc6e32011-07-18 04:24:23 +00001742 llvm::Type* InitType = Init->getType();
Chris Lattner570585c2009-03-21 09:16:30 +00001743 llvm::Constant *Entry = GetAddrOfGlobalVar(D, InitType);
Mike Stump1eb44332009-09-09 15:08:12 +00001744
Chris Lattner570585c2009-03-21 09:16:30 +00001745 // Strip off a bitcast if we got one back.
1746 if (llvm::ConstantExpr *CE = dyn_cast<llvm::ConstantExpr>(Entry)) {
Chris Lattner9d4a15f2009-07-16 16:48:25 +00001747 assert(CE->getOpcode() == llvm::Instruction::BitCast ||
1748 // all zero index gep.
1749 CE->getOpcode() == llvm::Instruction::GetElementPtr);
Chris Lattner570585c2009-03-21 09:16:30 +00001750 Entry = CE->getOperand(0);
1751 }
Mike Stump1eb44332009-09-09 15:08:12 +00001752
Chris Lattner570585c2009-03-21 09:16:30 +00001753 // Entry is now either a Function or GlobalVariable.
1754 llvm::GlobalVariable *GV = dyn_cast<llvm::GlobalVariable>(Entry);
Mike Stump1eb44332009-09-09 15:08:12 +00001755
Chris Lattner570585c2009-03-21 09:16:30 +00001756 // We have a definition after a declaration with the wrong type.
1757 // We must make a new GlobalVariable* and update everything that used OldGV
1758 // (a declaration or tentative definition) with the new GlobalVariable*
1759 // (which will be a definition).
1760 //
1761 // This happens if there is a prototype for a global (e.g.
1762 // "extern int x[];") and then a definition of a different type (e.g.
1763 // "int x[10];"). This also happens when an initializer has a different type
1764 // from the type of the global (this happens with unions).
Chris Lattner570585c2009-03-21 09:16:30 +00001765 if (GV == 0 ||
1766 GV->getType()->getElementType() != InitType ||
Peter Collingbourne207f4d82011-03-18 22:38:29 +00001767 GV->getType()->getAddressSpace() !=
Peter Collingbourne4dc34eb2012-05-20 21:08:35 +00001768 GetGlobalVarAddressSpace(D, getContext().getTargetAddressSpace(ASTTy))) {
Mike Stump1eb44332009-09-09 15:08:12 +00001769
John McCallf746aa62010-03-19 23:29:14 +00001770 // Move the old entry aside so that we'll create a new one.
Chris Lattner5f9e2722011-07-23 10:55:15 +00001771 Entry->setName(StringRef());
Daniel Dunbar232350d2009-02-19 05:36:41 +00001772
Chris Lattner570585c2009-03-21 09:16:30 +00001773 // Make a new global with the correct type, this is now guaranteed to work.
1774 GV = cast<llvm::GlobalVariable>(GetAddrOfGlobalVar(D, InitType));
Chris Lattner0558e792009-03-21 09:25:43 +00001775
Eli Friedman77ba7082008-05-30 19:50:47 +00001776 // Replace all uses of the old global with the new global
Mike Stump1eb44332009-09-09 15:08:12 +00001777 llvm::Constant *NewPtrForOldDecl =
Owen Anderson3c4972d2009-07-29 18:54:39 +00001778 llvm::ConstantExpr::getBitCast(GV, Entry->getType());
Chris Lattner570585c2009-03-21 09:16:30 +00001779 Entry->replaceAllUsesWith(NewPtrForOldDecl);
Eli Friedman77ba7082008-05-30 19:50:47 +00001780
1781 // Erase the old global, since it is no longer used.
Chris Lattner570585c2009-03-21 09:16:30 +00001782 cast<llvm::GlobalValue>(Entry)->eraseFromParent();
Chris Lattner8f32f712007-07-14 00:23:28 +00001783 }
Devang Patel8e53e722007-10-26 16:31:40 +00001784
Richard Smith00249372013-04-06 05:00:46 +00001785 MaybeHandleStaticInExternC(D, GV);
1786
Julien Lerouge77f68bb2011-09-09 22:41:49 +00001787 if (D->hasAttr<AnnotateAttr>())
1788 AddGlobalAnnotations(D, GV);
Nate Begeman8bd4afe2008-04-19 04:17:09 +00001789
Chris Lattner88a69ad2007-07-13 05:13:43 +00001790 GV->setInitializer(Init);
Chris Lattnere78b86f2009-08-05 05:20:29 +00001791
1792 // If it is safe to mark the global 'constant', do so now.
Richard Smitha9b21d22012-02-17 06:48:11 +00001793 GV->setConstant(!NeedsGlobalCtor && !NeedsGlobalDtor &&
1794 isTypeConstant(D->getType(), true));
Mike Stump1eb44332009-09-09 15:08:12 +00001795
Ken Dyck8b752f12010-01-27 17:10:57 +00001796 GV->setAlignment(getContext().getDeclAlign(D).getQuantity());
Richard Smitha9b21d22012-02-17 06:48:11 +00001797
Chris Lattner88a69ad2007-07-13 05:13:43 +00001798 // Set the llvm linkage type as appropriate.
Fariborz Jahanian354e7122010-10-27 16:21:54 +00001799 llvm::GlobalValue::LinkageTypes Linkage =
Eli Friedman07369dd2013-07-01 20:22:57 +00001800 GetLLVMLinkageVarDefinition(D, GV->isConstant());
Fariborz Jahanian354e7122010-10-27 16:21:54 +00001801 GV->setLinkage(Linkage);
1802 if (Linkage == llvm::GlobalVariable::CommonLinkage)
Chris Lattnere78b86f2009-08-05 05:20:29 +00001803 // common vars aren't constant even if declared const.
1804 GV->setConstant(false);
Daniel Dunbar7e714cd2009-04-10 20:26:50 +00001805
Daniel Dunbar7c65e992009-04-14 08:05:55 +00001806 SetCommonAttributes(D, GV);
Daniel Dunbar04d40782009-04-14 06:00:08 +00001807
John McCall3030eb82010-11-06 09:44:32 +00001808 // Emit the initializer function if necessary.
Richard Smith7ca48502012-02-13 22:16:19 +00001809 if (NeedsGlobalCtor || NeedsGlobalDtor)
1810 EmitCXXGlobalVarDeclInitFunc(D, GV, NeedsGlobalCtor);
John McCall3030eb82010-11-06 09:44:32 +00001811
Kostya Serebryany05c5ebc2012-08-21 06:53:28 +00001812 // If we are compiling with ASan, add metadata indicating dynamically
1813 // initialized globals.
Will Dietz4f45bc02013-01-18 11:30:38 +00001814 if (SanOpts.Address && NeedsGlobalCtor) {
Kostya Serebryany05c5ebc2012-08-21 06:53:28 +00001815 llvm::Module &M = getModule();
1816
1817 llvm::NamedMDNode *DynamicInitializers =
1818 M.getOrInsertNamedMetadata("llvm.asan.dynamically_initialized_globals");
1819 llvm::Value *GlobalToAdd[] = { GV };
1820 llvm::MDNode *ThisGlobal = llvm::MDNode::get(VMContext, GlobalToAdd);
1821 DynamicInitializers->addOperand(ThisGlobal);
1822 }
1823
Sanjiv Gupta686226b2008-06-05 08:59:10 +00001824 // Emit global variable debug information.
Eric Christopher73fb3502011-10-13 21:45:18 +00001825 if (CGDebugInfo *DI = getModuleDebugInfo())
Douglas Gregor4cdad312012-10-23 20:05:01 +00001826 if (getCodeGenOpts().getDebugInfo() >= CodeGenOptions::LimitedDebugInfo)
Alexey Samsonovfd00eec2012-05-04 07:39:27 +00001827 DI->EmitGlobalVariable(GV, D);
Chris Lattner88a69ad2007-07-13 05:13:43 +00001828}
Reid Spencer5f016e22007-07-11 17:01:13 +00001829
Fariborz Jahanian354e7122010-10-27 16:21:54 +00001830llvm::GlobalValue::LinkageTypes
Eli Friedman07369dd2013-07-01 20:22:57 +00001831CodeGenModule::GetLLVMLinkageVarDefinition(const VarDecl *D, bool isConstant) {
Fariborz Jahanian354e7122010-10-27 16:21:54 +00001832 GVALinkage Linkage = getContext().GetGVALinkageForVariable(D);
1833 if (Linkage == GVA_Internal)
1834 return llvm::Function::InternalLinkage;
1835 else if (D->hasAttr<DLLImportAttr>())
1836 return llvm::Function::DLLImportLinkage;
1837 else if (D->hasAttr<DLLExportAttr>())
1838 return llvm::Function::DLLExportLinkage;
Reid Klecknera7225342013-05-20 14:02:37 +00001839 else if (D->hasAttr<SelectAnyAttr>()) {
1840 // selectany symbols are externally visible, so use weak instead of
1841 // linkonce. MSVC optimizes away references to const selectany globals, so
1842 // all definitions should be the same and ODR linkage should be used.
1843 // http://msdn.microsoft.com/en-us/library/5tkz6s71.aspx
1844 return llvm::GlobalVariable::WeakODRLinkage;
1845 } else if (D->hasAttr<WeakAttr>()) {
Eli Friedman07369dd2013-07-01 20:22:57 +00001846 if (isConstant)
Fariborz Jahanian354e7122010-10-27 16:21:54 +00001847 return llvm::GlobalVariable::WeakODRLinkage;
1848 else
1849 return llvm::GlobalVariable::WeakAnyLinkage;
1850 } else if (Linkage == GVA_TemplateInstantiation ||
1851 Linkage == GVA_ExplicitTemplateInstantiation)
John McCall99ace162011-04-12 01:46:54 +00001852 return llvm::GlobalVariable::WeakODRLinkage;
David Blaikie4e4d0842012-03-11 07:00:24 +00001853 else if (!getLangOpts().CPlusPlus &&
Eric Christophera6cf1e72010-12-02 02:45:55 +00001854 ((!CodeGenOpts.NoCommon && !D->getAttr<NoCommonAttr>()) ||
1855 D->getAttr<CommonAttr>()) &&
Fariborz Jahanian354e7122010-10-27 16:21:54 +00001856 !D->hasExternalStorage() && !D->getInit() &&
Richard Smith38afbc72013-04-13 02:43:54 +00001857 !D->getAttr<SectionAttr>() && !D->getTLSKind() &&
Fariborz Jahanianab27d6e2011-06-20 17:50:03 +00001858 !D->getAttr<WeakImportAttr>()) {
Fariborz Jahanian354e7122010-10-27 16:21:54 +00001859 // Thread local vars aren't considered common linkage.
1860 return llvm::GlobalVariable::CommonLinkage;
Bill Wendling4e3b54b2013-05-02 19:18:03 +00001861 } else if (D->getTLSKind() == VarDecl::TLS_Dynamic &&
1862 getTarget().getTriple().isMacOSX())
1863 // On Darwin, the backing variable for a C++11 thread_local variable always
1864 // has internal linkage; all accesses should just be calls to the
1865 // Itanium-specified entry point, which has the normal linkage of the
1866 // variable.
1867 return llvm::GlobalValue::InternalLinkage;
Fariborz Jahanian354e7122010-10-27 16:21:54 +00001868 return llvm::GlobalVariable::ExternalLinkage;
1869}
1870
John McCalla923c972012-12-12 22:21:47 +00001871/// Replace the uses of a function that was declared with a non-proto type.
1872/// We want to silently drop extra arguments from call sites
1873static void replaceUsesOfNonProtoConstant(llvm::Constant *old,
1874 llvm::Function *newFn) {
1875 // Fast path.
1876 if (old->use_empty()) return;
1877
1878 llvm::Type *newRetTy = newFn->getReturnType();
1879 SmallVector<llvm::Value*, 4> newArgs;
1880
1881 for (llvm::Value::use_iterator ui = old->use_begin(), ue = old->use_end();
1882 ui != ue; ) {
1883 llvm::Value::use_iterator use = ui++; // Increment before the use is erased.
1884 llvm::User *user = *use;
1885
1886 // Recognize and replace uses of bitcasts. Most calls to
1887 // unprototyped functions will use bitcasts.
1888 if (llvm::ConstantExpr *bitcast = dyn_cast<llvm::ConstantExpr>(user)) {
1889 if (bitcast->getOpcode() == llvm::Instruction::BitCast)
1890 replaceUsesOfNonProtoConstant(bitcast, newFn);
1891 continue;
1892 }
1893
1894 // Recognize calls to the function.
1895 llvm::CallSite callSite(user);
1896 if (!callSite) continue;
1897 if (!callSite.isCallee(use)) continue;
1898
1899 // If the return types don't match exactly, then we can't
1900 // transform this call unless it's dead.
1901 if (callSite->getType() != newRetTy && !callSite->use_empty())
1902 continue;
1903
1904 // Get the call site's attribute list.
Bill Wendlingb263bdf2013-01-27 02:46:53 +00001905 SmallVector<llvm::AttributeSet, 8> newAttrs;
John McCalla923c972012-12-12 22:21:47 +00001906 llvm::AttributeSet oldAttrs = callSite.getAttributes();
1907
1908 // Collect any return attributes from the call.
Bill Wendlinga37ce612013-01-21 21:57:40 +00001909 if (oldAttrs.hasAttributes(llvm::AttributeSet::ReturnIndex))
Bill Wendlinged01f842013-01-21 22:45:00 +00001910 newAttrs.push_back(
Bill Wendlingb263bdf2013-01-27 02:46:53 +00001911 llvm::AttributeSet::get(newFn->getContext(),
1912 oldAttrs.getRetAttributes()));
John McCalla923c972012-12-12 22:21:47 +00001913
1914 // If the function was passed too few arguments, don't transform.
1915 unsigned newNumArgs = newFn->arg_size();
1916 if (callSite.arg_size() < newNumArgs) continue;
1917
1918 // If extra arguments were passed, we silently drop them.
1919 // If any of the types mismatch, we don't transform.
1920 unsigned argNo = 0;
1921 bool dontTransform = false;
1922 for (llvm::Function::arg_iterator ai = newFn->arg_begin(),
1923 ae = newFn->arg_end(); ai != ae; ++ai, ++argNo) {
1924 if (callSite.getArgument(argNo)->getType() != ai->getType()) {
1925 dontTransform = true;
1926 break;
1927 }
1928
1929 // Add any parameter attributes.
Bill Wendling89530e42013-01-23 06:15:10 +00001930 if (oldAttrs.hasAttributes(argNo + 1))
1931 newAttrs.
Bill Wendlingb263bdf2013-01-27 02:46:53 +00001932 push_back(llvm::
1933 AttributeSet::get(newFn->getContext(),
1934 oldAttrs.getParamAttributes(argNo + 1)));
John McCalla923c972012-12-12 22:21:47 +00001935 }
1936 if (dontTransform)
1937 continue;
1938
Bill Wendlinge67e4c92013-01-18 21:26:07 +00001939 if (oldAttrs.hasAttributes(llvm::AttributeSet::FunctionIndex))
Bill Wendlingb263bdf2013-01-27 02:46:53 +00001940 newAttrs.push_back(llvm::AttributeSet::get(newFn->getContext(),
1941 oldAttrs.getFnAttributes()));
John McCalla923c972012-12-12 22:21:47 +00001942
1943 // Okay, we can transform this. Create the new call instruction and copy
1944 // over the required information.
1945 newArgs.append(callSite.arg_begin(), callSite.arg_begin() + argNo);
1946
1947 llvm::CallSite newCall;
1948 if (callSite.isCall()) {
1949 newCall = llvm::CallInst::Create(newFn, newArgs, "",
1950 callSite.getInstruction());
1951 } else {
1952 llvm::InvokeInst *oldInvoke =
1953 cast<llvm::InvokeInst>(callSite.getInstruction());
1954 newCall = llvm::InvokeInst::Create(newFn,
1955 oldInvoke->getNormalDest(),
1956 oldInvoke->getUnwindDest(),
1957 newArgs, "",
1958 callSite.getInstruction());
1959 }
1960 newArgs.clear(); // for the next iteration
1961
1962 if (!newCall->getType()->isVoidTy())
1963 newCall->takeName(callSite.getInstruction());
1964 newCall.setAttributes(
1965 llvm::AttributeSet::get(newFn->getContext(), newAttrs));
1966 newCall.setCallingConv(callSite.getCallingConv());
1967
1968 // Finally, remove the old call, replacing any uses with the new one.
1969 if (!callSite->use_empty())
1970 callSite->replaceAllUsesWith(newCall.getInstruction());
1971
1972 // Copy debug location attached to CI.
1973 if (!callSite->getDebugLoc().isUnknown())
1974 newCall->setDebugLoc(callSite->getDebugLoc());
1975 callSite->eraseFromParent();
1976 }
1977}
1978
Chris Lattnerbdb01322009-05-05 06:16:31 +00001979/// ReplaceUsesOfNonProtoTypeWithRealFunction - This function is called when we
1980/// implement a function with no prototype, e.g. "int foo() {}". If there are
1981/// existing call uses of the old function in the module, this adjusts them to
1982/// call the new function directly.
1983///
1984/// This is not just a cleanup: the always_inline pass requires direct calls to
1985/// functions to be able to inline them. If there is a bitcast in the way, it
1986/// won't inline them. Instcombine normally deletes these calls, but it isn't
1987/// run at -O0.
1988static void ReplaceUsesOfNonProtoTypeWithRealFunction(llvm::GlobalValue *Old,
1989 llvm::Function *NewFn) {
1990 // If we're redefining a global as a function, don't transform it.
John McCalla923c972012-12-12 22:21:47 +00001991 if (!isa<llvm::Function>(Old)) return;
Mike Stump1eb44332009-09-09 15:08:12 +00001992
John McCalla923c972012-12-12 22:21:47 +00001993 replaceUsesOfNonProtoConstant(Old, NewFn);
Chris Lattnerbdb01322009-05-05 06:16:31 +00001994}
1995
Rafael Espindola02503932012-03-08 15:51:03 +00001996void CodeGenModule::HandleCXXStaticMemberVarInstantiation(VarDecl *VD) {
1997 TemplateSpecializationKind TSK = VD->getTemplateSpecializationKind();
1998 // If we have a definition, this might be a deferred decl. If the
1999 // instantiation is explicit, make sure we emit it at the end.
2000 if (VD->getDefinition() && TSK == TSK_ExplicitInstantiationDefinition)
2001 GetAddrOfGlobalVar(VD);
Argyrios Kyrtzidisafda9052013-02-24 00:05:01 +00002002
2003 EmitTopLevelDecl(VD);
Rafael Espindola234fe652012-03-05 10:54:55 +00002004}
Daniel Dunbarbd012ff2008-07-29 23:18:29 +00002005
Chris Lattnerb4880ba2009-05-12 21:21:08 +00002006void CodeGenModule::EmitGlobalFunctionDefinition(GlobalDecl GD) {
Chris Lattnerb4880ba2009-05-12 21:21:08 +00002007 const FunctionDecl *D = cast<FunctionDecl>(GD.getDecl());
John McCalld26bc762011-03-09 04:27:21 +00002008
John McCall1f6f9612011-03-09 08:12:35 +00002009 // Compute the function info and LLVM type.
John McCallde5d3c72012-02-17 03:33:10 +00002010 const CGFunctionInfo &FI = getTypes().arrangeGlobalDeclaration(GD);
2011 llvm::FunctionType *Ty = getTypes().GetFunctionType(FI);
John McCalld26bc762011-03-09 04:27:21 +00002012
Chris Lattner9fa959d2009-05-12 20:58:15 +00002013 // Get or create the prototype for the function.
Chris Lattnerb4880ba2009-05-12 21:21:08 +00002014 llvm::Constant *Entry = GetAddrOfFunction(GD, Ty);
Mike Stump1eb44332009-09-09 15:08:12 +00002015
Chris Lattner0558e792009-03-21 09:25:43 +00002016 // Strip off a bitcast if we got one back.
2017 if (llvm::ConstantExpr *CE = dyn_cast<llvm::ConstantExpr>(Entry)) {
2018 assert(CE->getOpcode() == llvm::Instruction::BitCast);
2019 Entry = CE->getOperand(0);
2020 }
Mike Stump1eb44332009-09-09 15:08:12 +00002021
2022
Chris Lattner0558e792009-03-21 09:25:43 +00002023 if (cast<llvm::GlobalValue>(Entry)->getType()->getElementType() != Ty) {
Chris Lattnerbdb01322009-05-05 06:16:31 +00002024 llvm::GlobalValue *OldFn = cast<llvm::GlobalValue>(Entry);
Mike Stump1eb44332009-09-09 15:08:12 +00002025
Daniel Dunbar42745812009-03-09 23:53:08 +00002026 // If the types mismatch then we have to rewrite the definition.
Chris Lattnerbdb01322009-05-05 06:16:31 +00002027 assert(OldFn->isDeclaration() &&
Chris Lattner0558e792009-03-21 09:25:43 +00002028 "Shouldn't replace non-declaration");
Chris Lattner34809502009-03-21 08:53:37 +00002029
Chris Lattner62b33ea2009-03-21 08:38:50 +00002030 // F is the Function* for the one with the wrong type, we must make a new
2031 // Function* and update everything that used F (a declaration) with the new
2032 // Function* (which will be a definition).
2033 //
2034 // This happens if there is a prototype for a function
2035 // (e.g. "int f()") and then a definition of a different type
John McCallf746aa62010-03-19 23:29:14 +00002036 // (e.g. "int f(int x)"). Move the old function aside so that it
2037 // doesn't interfere with GetAddrOfFunction.
Chris Lattner5f9e2722011-07-23 10:55:15 +00002038 OldFn->setName(StringRef());
Chris Lattnerb4880ba2009-05-12 21:21:08 +00002039 llvm::Function *NewFn = cast<llvm::Function>(GetAddrOfFunction(GD, Ty));
Mike Stump1eb44332009-09-09 15:08:12 +00002040
John McCalla923c972012-12-12 22:21:47 +00002041 // This might be an implementation of a function without a
2042 // prototype, in which case, try to do special replacement of
2043 // calls which match the new prototype. The really key thing here
2044 // is that we also potentially drop arguments from the call site
2045 // so as to make a direct call, which makes the inliner happier
2046 // and suppresses a number of optimizer warnings (!) about
2047 // dropping arguments.
2048 if (!OldFn->use_empty()) {
Chris Lattnerbdb01322009-05-05 06:16:31 +00002049 ReplaceUsesOfNonProtoTypeWithRealFunction(OldFn, NewFn);
Chris Lattner9fa959d2009-05-12 20:58:15 +00002050 OldFn->removeDeadConstantUsers();
2051 }
Mike Stump1eb44332009-09-09 15:08:12 +00002052
Chris Lattner62b33ea2009-03-21 08:38:50 +00002053 // Replace uses of F with the Function we will endow with a body.
Chris Lattnerbdb01322009-05-05 06:16:31 +00002054 if (!Entry->use_empty()) {
Mike Stump1eb44332009-09-09 15:08:12 +00002055 llvm::Constant *NewPtrForOldDecl =
Owen Anderson3c4972d2009-07-29 18:54:39 +00002056 llvm::ConstantExpr::getBitCast(NewFn, Entry->getType());
Chris Lattnerbdb01322009-05-05 06:16:31 +00002057 Entry->replaceAllUsesWith(NewPtrForOldDecl);
2058 }
Mike Stump1eb44332009-09-09 15:08:12 +00002059
Chris Lattner62b33ea2009-03-21 08:38:50 +00002060 // Ok, delete the old function now, which is dead.
Chris Lattnerbdb01322009-05-05 06:16:31 +00002061 OldFn->eraseFromParent();
Mike Stump1eb44332009-09-09 15:08:12 +00002062
Chris Lattner0558e792009-03-21 09:25:43 +00002063 Entry = NewFn;
Daniel Dunbarbd012ff2008-07-29 23:18:29 +00002064 }
Mike Stump1eb44332009-09-09 15:08:12 +00002065
John McCall112c9672010-11-02 21:04:24 +00002066 // We need to set linkage and visibility on the function before
2067 // generating code for it because various parts of IR generation
2068 // want to propagate this information down (e.g. to local static
2069 // declarations).
Chris Lattner0558e792009-03-21 09:25:43 +00002070 llvm::Function *Fn = cast<llvm::Function>(Entry);
Peter Collingbourne144a31f2013-06-05 17:49:37 +00002071 setFunctionLinkage(GD, Fn);
Daniel Dunbarbd012ff2008-07-29 23:18:29 +00002072
John McCall112c9672010-11-02 21:04:24 +00002073 // FIXME: this is redundant with part of SetFunctionDefinitionAttributes
Anders Carlsson0ffeaad2011-01-29 19:39:23 +00002074 setGlobalVisibility(Fn, D);
John McCall112c9672010-11-02 21:04:24 +00002075
Richard Smith00249372013-04-06 05:00:46 +00002076 MaybeHandleStaticInExternC(D, Fn);
2077
John McCalld26bc762011-03-09 04:27:21 +00002078 CodeGenFunction(*this).GenerateCode(D, Fn, FI);
Daniel Dunbar6bfed7e2008-08-01 00:01:51 +00002079
Daniel Dunbar7c65e992009-04-14 08:05:55 +00002080 SetFunctionDefinitionAttributes(D, Fn);
2081 SetLLVMFunctionAttributesForDefinition(D, Fn);
Mike Stump1eb44332009-09-09 15:08:12 +00002082
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +00002083 if (const ConstructorAttr *CA = D->getAttr<ConstructorAttr>())
Daniel Dunbar219df662008-09-08 23:44:31 +00002084 AddGlobalCtor(Fn, CA->getPriority());
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +00002085 if (const DestructorAttr *DA = D->getAttr<DestructorAttr>())
Daniel Dunbar219df662008-09-08 23:44:31 +00002086 AddGlobalDtor(Fn, DA->getPriority());
Julien Lerouge77f68bb2011-09-09 22:41:49 +00002087 if (D->hasAttr<AnnotateAttr>())
2088 AddGlobalAnnotations(D, Fn);
Daniel Dunbarbd012ff2008-07-29 23:18:29 +00002089}
2090
John McCallf746aa62010-03-19 23:29:14 +00002091void CodeGenModule::EmitAliasDefinition(GlobalDecl GD) {
2092 const ValueDecl *D = cast<ValueDecl>(GD.getDecl());
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +00002093 const AliasAttr *AA = D->getAttr<AliasAttr>();
Chris Lattnerbd532712009-03-22 21:47:11 +00002094 assert(AA && "Not an alias?");
2095
Chris Lattner5f9e2722011-07-23 10:55:15 +00002096 StringRef MangledName = getMangledName(GD);
Mike Stump1eb44332009-09-09 15:08:12 +00002097
John McCallf746aa62010-03-19 23:29:14 +00002098 // If there is a definition in the module, then it wins over the alias.
2099 // This is dubious, but allow it to be safe. Just ignore the alias.
2100 llvm::GlobalValue *Entry = GetGlobalValue(MangledName);
2101 if (Entry && !Entry->isDeclaration())
2102 return;
2103
Chris Lattner2acc6e32011-07-18 04:24:23 +00002104 llvm::Type *DeclTy = getTypes().ConvertTypeForMem(D->getType());
Chris Lattnerbd532712009-03-22 21:47:11 +00002105
2106 // Create a reference to the named value. This ensures that it is emitted
2107 // if a deferred decl.
2108 llvm::Constant *Aliasee;
2109 if (isa<llvm::FunctionType>(DeclTy))
Alex Rosenbergc857ce82012-10-05 23:12:53 +00002110 Aliasee = GetOrCreateLLVMFunction(AA->getAliasee(), DeclTy, GD,
Anders Carlsson1faa89f2011-02-05 04:35:53 +00002111 /*ForVTable=*/false);
Chris Lattnerbd532712009-03-22 21:47:11 +00002112 else
John McCallf746aa62010-03-19 23:29:14 +00002113 Aliasee = GetOrCreateLLVMGlobal(AA->getAliasee(),
Owen Anderson96e0fc72009-07-29 22:16:19 +00002114 llvm::PointerType::getUnqual(DeclTy), 0);
Chris Lattnerbd532712009-03-22 21:47:11 +00002115
2116 // Create the new alias itself, but don't set a name yet.
Mike Stump1eb44332009-09-09 15:08:12 +00002117 llvm::GlobalValue *GA =
Chris Lattnerbd532712009-03-22 21:47:11 +00002118 new llvm::GlobalAlias(Aliasee->getType(),
2119 llvm::Function::ExternalLinkage,
2120 "", Aliasee, &getModule());
Mike Stump1eb44332009-09-09 15:08:12 +00002121
Chris Lattnerbd532712009-03-22 21:47:11 +00002122 if (Entry) {
John McCallf746aa62010-03-19 23:29:14 +00002123 assert(Entry->isDeclaration());
2124
Chris Lattnerbd532712009-03-22 21:47:11 +00002125 // If there is a declaration in the module, then we had an extern followed
2126 // by the alias, as in:
2127 // extern int test6();
2128 // ...
2129 // int test6() __attribute__((alias("test7")));
2130 //
2131 // Remove it and replace uses of it with the alias.
John McCallf746aa62010-03-19 23:29:14 +00002132 GA->takeName(Entry);
Mike Stump1eb44332009-09-09 15:08:12 +00002133
Owen Anderson3c4972d2009-07-29 18:54:39 +00002134 Entry->replaceAllUsesWith(llvm::ConstantExpr::getBitCast(GA,
Chris Lattnerbd532712009-03-22 21:47:11 +00002135 Entry->getType()));
Chris Lattnerbd532712009-03-22 21:47:11 +00002136 Entry->eraseFromParent();
John McCallf746aa62010-03-19 23:29:14 +00002137 } else {
Anders Carlsson9a20d552010-06-22 16:16:50 +00002138 GA->setName(MangledName);
Chris Lattnerbd532712009-03-22 21:47:11 +00002139 }
Mike Stump1eb44332009-09-09 15:08:12 +00002140
Daniel Dunbar7c65e992009-04-14 08:05:55 +00002141 // Set attributes which are particular to an alias; this is a
2142 // specialization of the attributes which may be set on a global
2143 // variable/function.
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +00002144 if (D->hasAttr<DLLExportAttr>()) {
Daniel Dunbar7c65e992009-04-14 08:05:55 +00002145 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
2146 // The dllexport attribute is ignored for undefined symbols.
Argyrios Kyrtzidis06a54a32010-07-07 11:31:19 +00002147 if (FD->hasBody())
Daniel Dunbar7c65e992009-04-14 08:05:55 +00002148 GA->setLinkage(llvm::Function::DLLExportLinkage);
2149 } else {
2150 GA->setLinkage(llvm::Function::DLLExportLinkage);
2151 }
Mike Stump1eb44332009-09-09 15:08:12 +00002152 } else if (D->hasAttr<WeakAttr>() ||
Rafael Espindola11e8ce72010-02-23 22:00:30 +00002153 D->hasAttr<WeakRefAttr>() ||
Douglas Gregor0a0d2b12011-03-23 00:50:03 +00002154 D->isWeakImported()) {
Daniel Dunbar7c65e992009-04-14 08:05:55 +00002155 GA->setLinkage(llvm::Function::WeakAnyLinkage);
2156 }
2157
2158 SetCommonAttributes(D, GA);
Chris Lattnerbd532712009-03-22 21:47:11 +00002159}
2160
Benjamin Kramer8dd55a32011-07-14 17:45:50 +00002161llvm::Function *CodeGenModule::getIntrinsic(unsigned IID,
Chris Lattner2d3ba4f2011-07-23 17:14:25 +00002162 ArrayRef<llvm::Type*> Tys) {
Jay Foaddf983a82011-07-12 14:06:48 +00002163 return llvm::Intrinsic::getDeclaration(&getModule(), (llvm::Intrinsic::ID)IID,
Benjamin Kramer8dd55a32011-07-14 17:45:50 +00002164 Tys);
Chris Lattner7acda7c2007-12-18 00:25:38 +00002165}
Chris Lattnerbef20ac2007-08-31 04:31:45 +00002166
Daniel Dunbar1d552912009-07-23 22:52:48 +00002167static llvm::StringMapEntry<llvm::Constant*> &
2168GetConstantCFStringEntry(llvm::StringMap<llvm::Constant*> &Map,
2169 const StringLiteral *Literal,
Daniel Dunbar70ee9752009-07-23 23:41:22 +00002170 bool TargetIsLSB,
Daniel Dunbar1d552912009-07-23 22:52:48 +00002171 bool &IsUTF16,
2172 unsigned &StringLength) {
Chris Lattner5f9e2722011-07-23 10:55:15 +00002173 StringRef String = Literal->getString();
Benjamin Kramer2f4eaef2010-08-17 12:54:38 +00002174 unsigned NumBytes = String.size();
Daniel Dunbar1d552912009-07-23 22:52:48 +00002175
Daniel Dunbarf015b032009-09-22 10:03:52 +00002176 // Check for simple case.
2177 if (!Literal->containsNonAsciiOrNull()) {
2178 StringLength = NumBytes;
Benjamin Kramer2f4eaef2010-08-17 12:54:38 +00002179 return Map.GetOrCreateValue(String);
Daniel Dunbarf015b032009-09-22 10:03:52 +00002180 }
2181
Bill Wendling84392d02012-03-30 00:26:17 +00002182 // Otherwise, convert the UTF8 literals into a string of shorts.
2183 IsUTF16 = true;
2184
2185 SmallVector<UTF16, 128> ToBuf(NumBytes + 1); // +1 for ending nulls.
Roman Divacky31ba6132012-09-06 15:59:27 +00002186 const UTF8 *FromPtr = (const UTF8 *)String.data();
Daniel Dunbar1d552912009-07-23 22:52:48 +00002187 UTF16 *ToPtr = &ToBuf[0];
Mike Stump1eb44332009-09-09 15:08:12 +00002188
Fariborz Jahaniane7ddfb92010-09-07 19:57:04 +00002189 (void)ConvertUTF8toUTF16(&FromPtr, FromPtr + NumBytes,
2190 &ToPtr, ToPtr + NumBytes,
2191 strictConversion);
Mike Stump1eb44332009-09-09 15:08:12 +00002192
Daniel Dunbar70ee9752009-07-23 23:41:22 +00002193 // ConvertUTF8toUTF16 returns the length in ToPtr.
Daniel Dunbar1d552912009-07-23 22:52:48 +00002194 StringLength = ToPtr - &ToBuf[0];
Daniel Dunbar70ee9752009-07-23 23:41:22 +00002195
Bill Wendling84392d02012-03-30 00:26:17 +00002196 // Add an explicit null.
2197 *ToPtr = 0;
2198 return Map.
2199 GetOrCreateValue(StringRef(reinterpret_cast<const char *>(ToBuf.data()),
2200 (StringLength + 1) * 2));
Daniel Dunbar1d552912009-07-23 22:52:48 +00002201}
2202
Fariborz Jahaniancf8e1682011-05-13 18:13:10 +00002203static llvm::StringMapEntry<llvm::Constant*> &
2204GetConstantStringEntry(llvm::StringMap<llvm::Constant*> &Map,
Bill Wendling8322c232012-03-29 22:12:09 +00002205 const StringLiteral *Literal,
2206 unsigned &StringLength) {
2207 StringRef String = Literal->getString();
2208 StringLength = String.size();
2209 return Map.GetOrCreateValue(String);
Fariborz Jahaniancf8e1682011-05-13 18:13:10 +00002210}
2211
Daniel Dunbar1d552912009-07-23 22:52:48 +00002212llvm::Constant *
2213CodeGenModule::GetAddrOfConstantCFString(const StringLiteral *Literal) {
2214 unsigned StringLength = 0;
2215 bool isUTF16 = false;
2216 llvm::StringMapEntry<llvm::Constant*> &Entry =
Mike Stump1eb44332009-09-09 15:08:12 +00002217 GetConstantCFStringEntry(CFConstantStringMap, Literal,
Micah Villmow25a6a842012-10-08 16:25:52 +00002218 getDataLayout().isLittleEndian(),
Daniel Dunbar70ee9752009-07-23 23:41:22 +00002219 isUTF16, StringLength);
Mike Stump1eb44332009-09-09 15:08:12 +00002220
Daniel Dunbar1d552912009-07-23 22:52:48 +00002221 if (llvm::Constant *C = Entry.getValue())
2222 return C;
Mike Stump1eb44332009-09-09 15:08:12 +00002223
Chris Lattner8b418682012-02-07 00:39:47 +00002224 llvm::Constant *Zero = llvm::Constant::getNullValue(Int32Ty);
Daniel Dunbar3e9df992008-08-23 18:37:06 +00002225 llvm::Constant *Zeros[] = { Zero, Zero };
Fariborz Jahanian428edb72013-04-16 15:25:39 +00002226 llvm::Value *V;
2227
Chris Lattner9d4a15f2009-07-16 16:48:25 +00002228 // If we don't already have it, get __CFConstantStringClassReference.
Anders Carlssonc9e20912007-08-21 00:21:21 +00002229 if (!CFConstantStringClassRef) {
Chris Lattner2acc6e32011-07-18 04:24:23 +00002230 llvm::Type *Ty = getTypes().ConvertType(getContext().IntTy);
Owen Anderson96e0fc72009-07-29 22:16:19 +00002231 Ty = llvm::ArrayType::get(Ty, 0);
Mike Stump1eb44332009-09-09 15:08:12 +00002232 llvm::Constant *GV = CreateRuntimeVariable(Ty,
Chris Lattner9d4a15f2009-07-16 16:48:25 +00002233 "__CFConstantStringClassReference");
Daniel Dunbar3e9df992008-08-23 18:37:06 +00002234 // Decay array -> ptr
Fariborz Jahanian428edb72013-04-16 15:25:39 +00002235 V = llvm::ConstantExpr::getGetElementPtr(GV, Zeros);
2236 CFConstantStringClassRef = V;
Anders Carlssonc9e20912007-08-21 00:21:21 +00002237 }
Fariborz Jahanian428edb72013-04-16 15:25:39 +00002238 else
2239 V = CFConstantStringClassRef;
Mike Stump1eb44332009-09-09 15:08:12 +00002240
Anders Carlssone3daa762008-11-15 18:54:24 +00002241 QualType CFTy = getContext().getCFConstantStringType();
Daniel Dunbar3e9df992008-08-23 18:37:06 +00002242
Chris Lattner2acc6e32011-07-18 04:24:23 +00002243 llvm::StructType *STy =
Anders Carlssone3daa762008-11-15 18:54:24 +00002244 cast<llvm::StructType>(getTypes().ConvertType(CFTy));
2245
Benjamin Kramer1d236ab2011-10-15 12:20:02 +00002246 llvm::Constant *Fields[4];
Douglas Gregor44b43212008-12-11 16:49:14 +00002247
Anders Carlssonc9e20912007-08-21 00:21:21 +00002248 // Class pointer.
Fariborz Jahanian428edb72013-04-16 15:25:39 +00002249 Fields[0] = cast<llvm::ConstantExpr>(V);
Mike Stump1eb44332009-09-09 15:08:12 +00002250
Anders Carlssonc9e20912007-08-21 00:21:21 +00002251 // Flags.
Chris Lattner2acc6e32011-07-18 04:24:23 +00002252 llvm::Type *Ty = getTypes().ConvertType(getContext().UnsignedIntTy);
Mike Stump1eb44332009-09-09 15:08:12 +00002253 Fields[1] = isUTF16 ? llvm::ConstantInt::get(Ty, 0x07d0) :
Anders Carlsson5add6832009-08-16 05:55:31 +00002254 llvm::ConstantInt::get(Ty, 0x07C8);
2255
Anders Carlssonc9e20912007-08-21 00:21:21 +00002256 // String pointer.
Bill Wendling84392d02012-03-30 00:26:17 +00002257 llvm::Constant *C = 0;
2258 if (isUTF16) {
2259 ArrayRef<uint16_t> Arr =
David Greene5ba58a12013-01-15 22:09:41 +00002260 llvm::makeArrayRef<uint16_t>(reinterpret_cast<uint16_t*>(
2261 const_cast<char *>(Entry.getKey().data())),
Bill Wendling84392d02012-03-30 00:26:17 +00002262 Entry.getKey().size() / 2);
2263 C = llvm::ConstantDataArray::get(VMContext, Arr);
2264 } else {
2265 C = llvm::ConstantDataArray::getString(VMContext, Entry.getKey());
2266 }
Daniel Dunbara9668e02009-04-03 00:57:44 +00002267
Chris Lattner95b851e2009-07-16 05:03:48 +00002268 llvm::GlobalValue::LinkageTypes Linkage;
Bill Wendling1bf7a3f2012-01-10 08:46:39 +00002269 if (isUTF16)
Chris Lattner278b9f02009-10-14 05:55:45 +00002270 // FIXME: why do utf strings get "_" labels instead of "L" labels?
Chris Lattner95b851e2009-07-16 05:03:48 +00002271 Linkage = llvm::GlobalValue::InternalLinkage;
Bill Wendling1bf7a3f2012-01-10 08:46:39 +00002272 else
Rafael Espindola584acf22011-03-14 17:55:00 +00002273 // FIXME: With OS X ld 123.2 (xcode 4) and LTO we would get a linker error
2274 // when using private linkage. It is not clear if this is a bug in ld
2275 // or a reasonable new restriction.
Rafael Espindoladc0f1372011-03-14 21:08:19 +00002276 Linkage = llvm::GlobalValue::LinkerPrivateLinkage;
Chris Lattner278b9f02009-10-14 05:55:45 +00002277
Bill Wendling1bf7a3f2012-01-10 08:46:39 +00002278 // Note: -fwritable-strings doesn't make the backing store strings of
2279 // CFStrings writable. (See <rdar://problem/10657500>)
Mike Stump1eb44332009-09-09 15:08:12 +00002280 llvm::GlobalVariable *GV =
Bill Wendling1bf7a3f2012-01-10 08:46:39 +00002281 new llvm::GlobalVariable(getModule(), C->getType(), /*isConstant=*/true,
2282 Linkage, C, ".str");
Rafael Espindolab266a1f2011-01-17 16:31:00 +00002283 GV->setUnnamedAddr(true);
Ulrich Weigand6b203512013-05-06 16:23:57 +00002284 // Don't enforce the target's minimum global alignment, since the only use
2285 // of the string is via this class initializer.
Daniel Dunbara9668e02009-04-03 00:57:44 +00002286 if (isUTF16) {
Ken Dyck4da244c2010-01-26 18:46:23 +00002287 CharUnits Align = getContext().getTypeAlignInChars(getContext().ShortTy);
2288 GV->setAlignment(Align.getQuantity());
Daniel Dunbarf7e903d2011-04-12 23:30:52 +00002289 } else {
2290 CharUnits Align = getContext().getTypeAlignInChars(getContext().CharTy);
2291 GV->setAlignment(Align.getQuantity());
Daniel Dunbara9668e02009-04-03 00:57:44 +00002292 }
Bill Wendling84392d02012-03-30 00:26:17 +00002293
2294 // String.
Jay Foada5c04342011-07-21 14:31:17 +00002295 Fields[2] = llvm::ConstantExpr::getGetElementPtr(GV, Zeros);
Anders Carlsson5add6832009-08-16 05:55:31 +00002296
Bill Wendling84392d02012-03-30 00:26:17 +00002297 if (isUTF16)
2298 // Cast the UTF16 string to the correct type.
2299 Fields[2] = llvm::ConstantExpr::getBitCast(Fields[2], Int8PtrTy);
2300
Anders Carlssonc9e20912007-08-21 00:21:21 +00002301 // String length.
2302 Ty = getTypes().ConvertType(getContext().LongTy);
Anders Carlsson5add6832009-08-16 05:55:31 +00002303 Fields[3] = llvm::ConstantInt::get(Ty, StringLength);
Mike Stump1eb44332009-09-09 15:08:12 +00002304
Anders Carlssonc9e20912007-08-21 00:21:21 +00002305 // The struct.
Owen Anderson08e25242009-07-27 22:29:56 +00002306 C = llvm::ConstantStruct::get(STy, Fields);
Mike Stump1eb44332009-09-09 15:08:12 +00002307 GV = new llvm::GlobalVariable(getModule(), C->getType(), true,
2308 llvm::GlobalVariable::PrivateLinkage, C,
Chris Lattner95b851e2009-07-16 05:03:48 +00002309 "_unnamed_cfstring_");
John McCall64aa4b32013-04-16 22:48:15 +00002310 if (const char *Sect = getTarget().getCFStringSection())
Daniel Dunbar8e5c2b82009-03-31 23:42:16 +00002311 GV->setSection(Sect);
Daniel Dunbar1d552912009-07-23 22:52:48 +00002312 Entry.setValue(GV);
Mike Stump1eb44332009-09-09 15:08:12 +00002313
Anders Carlsson0c678292007-11-01 00:41:52 +00002314 return GV;
Anders Carlssonc9e20912007-08-21 00:21:21 +00002315}
Chris Lattner45e8cbd2007-11-28 05:34:05 +00002316
Douglas Gregor45c4ea72011-08-09 15:54:21 +00002317static RecordDecl *
2318CreateRecordDecl(const ASTContext &Ctx, RecordDecl::TagKind TK,
2319 DeclContext *DC, IdentifierInfo *Id) {
2320 SourceLocation Loc;
David Blaikie4e4d0842012-03-11 07:00:24 +00002321 if (Ctx.getLangOpts().CPlusPlus)
Douglas Gregor45c4ea72011-08-09 15:54:21 +00002322 return CXXRecordDecl::Create(Ctx, TK, DC, Loc, Loc, Id);
2323 else
2324 return RecordDecl::Create(Ctx, TK, DC, Loc, Loc, Id);
2325}
2326
Fariborz Jahanian33e982b2010-04-22 20:26:39 +00002327llvm::Constant *
Fariborz Jahanian4c733072010-10-19 17:19:29 +00002328CodeGenModule::GetAddrOfConstantString(const StringLiteral *Literal) {
Fariborz Jahanian2bb5dda2010-04-23 17:41:07 +00002329 unsigned StringLength = 0;
Fariborz Jahanian2bb5dda2010-04-23 17:41:07 +00002330 llvm::StringMapEntry<llvm::Constant*> &Entry =
Fariborz Jahaniancf8e1682011-05-13 18:13:10 +00002331 GetConstantStringEntry(CFConstantStringMap, Literal, StringLength);
Fariborz Jahanian2bb5dda2010-04-23 17:41:07 +00002332
2333 if (llvm::Constant *C = Entry.getValue())
2334 return C;
2335
Chris Lattner812234b2012-02-06 22:47:00 +00002336 llvm::Constant *Zero = llvm::Constant::getNullValue(Int32Ty);
Fariborz Jahanian2bb5dda2010-04-23 17:41:07 +00002337 llvm::Constant *Zeros[] = { Zero, Zero };
Fariborz Jahanian428edb72013-04-16 15:25:39 +00002338 llvm::Value *V;
Fariborz Jahanianec951e02010-04-23 22:33:39 +00002339 // If we don't already have it, get _NSConstantStringClassReference.
Fariborz Jahanian4c733072010-10-19 17:19:29 +00002340 if (!ConstantStringClassRef) {
David Blaikie4e4d0842012-03-11 07:00:24 +00002341 std::string StringClass(getLangOpts().ObjCConstantStringClass);
Chris Lattner2acc6e32011-07-18 04:24:23 +00002342 llvm::Type *Ty = getTypes().ConvertType(getContext().IntTy);
Fariborz Jahanian4c733072010-10-19 17:19:29 +00002343 llvm::Constant *GV;
John McCall260611a2012-06-20 06:18:46 +00002344 if (LangOpts.ObjCRuntime.isNonFragile()) {
Fariborz Jahanian25dba5d2011-05-17 22:46:11 +00002345 std::string str =
2346 StringClass.empty() ? "OBJC_CLASS_$_NSConstantString"
2347 : "OBJC_CLASS_$_" + StringClass;
Fariborz Jahanian6f40e222011-05-17 22:21:16 +00002348 GV = getObjCRuntime().GetClassGlobal(str);
2349 // Make sure the result is of the correct type.
Chris Lattner2acc6e32011-07-18 04:24:23 +00002350 llvm::Type *PTy = llvm::PointerType::getUnqual(Ty);
Fariborz Jahanian428edb72013-04-16 15:25:39 +00002351 V = llvm::ConstantExpr::getBitCast(GV, PTy);
2352 ConstantStringClassRef = V;
Fariborz Jahanian6f40e222011-05-17 22:21:16 +00002353 } else {
Fariborz Jahanian25dba5d2011-05-17 22:46:11 +00002354 std::string str =
2355 StringClass.empty() ? "_NSConstantStringClassReference"
2356 : "_" + StringClass + "ClassReference";
Chris Lattner2acc6e32011-07-18 04:24:23 +00002357 llvm::Type *PTy = llvm::ArrayType::get(Ty, 0);
Fariborz Jahanian25dba5d2011-05-17 22:46:11 +00002358 GV = CreateRuntimeVariable(PTy, str);
Fariborz Jahanian6f40e222011-05-17 22:21:16 +00002359 // Decay array -> ptr
Fariborz Jahanian428edb72013-04-16 15:25:39 +00002360 V = llvm::ConstantExpr::getGetElementPtr(GV, Zeros);
2361 ConstantStringClassRef = V;
Fariborz Jahanian4c733072010-10-19 17:19:29 +00002362 }
Fariborz Jahanian2bb5dda2010-04-23 17:41:07 +00002363 }
Fariborz Jahanian428edb72013-04-16 15:25:39 +00002364 else
2365 V = ConstantStringClassRef;
Douglas Gregor45c4ea72011-08-09 15:54:21 +00002366
2367 if (!NSConstantStringType) {
2368 // Construct the type for a constant NSString.
2369 RecordDecl *D = CreateRecordDecl(Context, TTK_Struct,
2370 Context.getTranslationUnitDecl(),
2371 &Context.Idents.get("__builtin_NSString"));
2372 D->startDefinition();
2373
2374 QualType FieldTypes[3];
2375
2376 // const int *isa;
2377 FieldTypes[0] = Context.getPointerType(Context.IntTy.withConst());
2378 // const char *str;
2379 FieldTypes[1] = Context.getPointerType(Context.CharTy.withConst());
2380 // unsigned int length;
2381 FieldTypes[2] = Context.UnsignedIntTy;
2382
2383 // Create fields
2384 for (unsigned i = 0; i < 3; ++i) {
2385 FieldDecl *Field = FieldDecl::Create(Context, D,
2386 SourceLocation(),
2387 SourceLocation(), 0,
2388 FieldTypes[i], /*TInfo=*/0,
2389 /*BitWidth=*/0,
2390 /*Mutable=*/false,
Richard Smithca523302012-06-10 03:12:00 +00002391 ICIS_NoInit);
Douglas Gregor45c4ea72011-08-09 15:54:21 +00002392 Field->setAccess(AS_public);
2393 D->addDecl(Field);
2394 }
2395
2396 D->completeDefinition();
2397 QualType NSTy = Context.getTagDeclType(D);
2398 NSConstantStringType = cast<llvm::StructType>(getTypes().ConvertType(NSTy));
2399 }
Fariborz Jahanian2bb5dda2010-04-23 17:41:07 +00002400
Benjamin Kramer1d236ab2011-10-15 12:20:02 +00002401 llvm::Constant *Fields[3];
Fariborz Jahanian2bb5dda2010-04-23 17:41:07 +00002402
2403 // Class pointer.
Fariborz Jahanian428edb72013-04-16 15:25:39 +00002404 Fields[0] = cast<llvm::ConstantExpr>(V);
Fariborz Jahanian2bb5dda2010-04-23 17:41:07 +00002405
2406 // String pointer.
Chris Lattner94010692012-02-05 02:30:40 +00002407 llvm::Constant *C =
2408 llvm::ConstantDataArray::getString(VMContext, Entry.getKey());
Fariborz Jahanian2bb5dda2010-04-23 17:41:07 +00002409
2410 llvm::GlobalValue::LinkageTypes Linkage;
2411 bool isConstant;
Fariborz Jahaniancf8e1682011-05-13 18:13:10 +00002412 Linkage = llvm::GlobalValue::PrivateLinkage;
David Blaikie4e4d0842012-03-11 07:00:24 +00002413 isConstant = !LangOpts.WritableStrings;
Fariborz Jahanian2bb5dda2010-04-23 17:41:07 +00002414
2415 llvm::GlobalVariable *GV =
2416 new llvm::GlobalVariable(getModule(), C->getType(), isConstant, Linkage, C,
2417 ".str");
Rafael Espindola803d3072011-01-17 22:11:21 +00002418 GV->setUnnamedAddr(true);
Ulrich Weigand6b203512013-05-06 16:23:57 +00002419 // Don't enforce the target's minimum global alignment, since the only use
2420 // of the string is via this class initializer.
Fariborz Jahaniancf8e1682011-05-13 18:13:10 +00002421 CharUnits Align = getContext().getTypeAlignInChars(getContext().CharTy);
2422 GV->setAlignment(Align.getQuantity());
Jay Foada5c04342011-07-21 14:31:17 +00002423 Fields[1] = llvm::ConstantExpr::getGetElementPtr(GV, Zeros);
Fariborz Jahanian2bb5dda2010-04-23 17:41:07 +00002424
2425 // String length.
Chris Lattner2acc6e32011-07-18 04:24:23 +00002426 llvm::Type *Ty = getTypes().ConvertType(getContext().UnsignedIntTy);
Fariborz Jahanian2bb5dda2010-04-23 17:41:07 +00002427 Fields[2] = llvm::ConstantInt::get(Ty, StringLength);
2428
2429 // The struct.
Douglas Gregor45c4ea72011-08-09 15:54:21 +00002430 C = llvm::ConstantStruct::get(NSConstantStringType, Fields);
Fariborz Jahanian2bb5dda2010-04-23 17:41:07 +00002431 GV = new llvm::GlobalVariable(getModule(), C->getType(), true,
2432 llvm::GlobalVariable::PrivateLinkage, C,
2433 "_unnamed_nsstring_");
2434 // FIXME. Fix section.
Fariborz Jahanianec951e02010-04-23 22:33:39 +00002435 if (const char *Sect =
John McCall260611a2012-06-20 06:18:46 +00002436 LangOpts.ObjCRuntime.isNonFragile()
John McCall64aa4b32013-04-16 22:48:15 +00002437 ? getTarget().getNSStringNonFragileABISection()
2438 : getTarget().getNSStringSection())
Fariborz Jahanian2bb5dda2010-04-23 17:41:07 +00002439 GV->setSection(Sect);
2440 Entry.setValue(GV);
2441
2442 return GV;
Fariborz Jahanian33e982b2010-04-22 20:26:39 +00002443}
2444
Douglas Gregor0815b572011-08-09 17:23:49 +00002445QualType CodeGenModule::getObjCFastEnumerationStateType() {
2446 if (ObjCFastEnumerationStateType.isNull()) {
2447 RecordDecl *D = CreateRecordDecl(Context, TTK_Struct,
2448 Context.getTranslationUnitDecl(),
2449 &Context.Idents.get("__objcFastEnumerationState"));
2450 D->startDefinition();
2451
2452 QualType FieldTypes[] = {
2453 Context.UnsignedLongTy,
2454 Context.getPointerType(Context.getObjCIdType()),
2455 Context.getPointerType(Context.UnsignedLongTy),
2456 Context.getConstantArrayType(Context.UnsignedLongTy,
2457 llvm::APInt(32, 5), ArrayType::Normal, 0)
2458 };
2459
2460 for (size_t i = 0; i < 4; ++i) {
2461 FieldDecl *Field = FieldDecl::Create(Context,
2462 D,
2463 SourceLocation(),
2464 SourceLocation(), 0,
2465 FieldTypes[i], /*TInfo=*/0,
2466 /*BitWidth=*/0,
2467 /*Mutable=*/false,
Richard Smithca523302012-06-10 03:12:00 +00002468 ICIS_NoInit);
Douglas Gregor0815b572011-08-09 17:23:49 +00002469 Field->setAccess(AS_public);
2470 D->addDecl(Field);
2471 }
2472
2473 D->completeDefinition();
2474 ObjCFastEnumerationStateType = Context.getTagDeclType(D);
2475 }
2476
2477 return ObjCFastEnumerationStateType;
2478}
2479
Eli Friedman64f45a22011-11-01 02:23:42 +00002480llvm::Constant *
2481CodeGenModule::GetConstantArrayFromStringLiteral(const StringLiteral *E) {
2482 assert(!E->getType()->isPointerType() && "Strings are always arrays");
2483
2484 // Don't emit it as the address of the string, emit the string data itself
2485 // as an inline array.
Chris Lattner812234b2012-02-06 22:47:00 +00002486 if (E->getCharByteWidth() == 1) {
2487 SmallString<64> Str(E->getString());
2488
2489 // Resize the string to the right size, which is indicated by its type.
2490 const ConstantArrayType *CAT = Context.getAsConstantArrayType(E->getType());
2491 Str.resize(CAT->getSize().getZExtValue());
2492 return llvm::ConstantDataArray::getString(VMContext, Str, false);
2493 }
Chris Lattner94010692012-02-05 02:30:40 +00002494
2495 llvm::ArrayType *AType =
2496 cast<llvm::ArrayType>(getTypes().ConvertType(E->getType()));
2497 llvm::Type *ElemTy = AType->getElementType();
2498 unsigned NumElements = AType->getNumElements();
Chris Lattnerd79ed432012-02-06 22:52:04 +00002499
2500 // Wide strings have either 2-byte or 4-byte elements.
2501 if (ElemTy->getPrimitiveSizeInBits() == 16) {
2502 SmallVector<uint16_t, 32> Elements;
2503 Elements.reserve(NumElements);
2504
2505 for(unsigned i = 0, e = E->getLength(); i != e; ++i)
2506 Elements.push_back(E->getCodeUnit(i));
2507 Elements.resize(NumElements);
2508 return llvm::ConstantDataArray::get(VMContext, Elements);
Chris Lattner94010692012-02-05 02:30:40 +00002509 }
2510
Chris Lattnerd79ed432012-02-06 22:52:04 +00002511 assert(ElemTy->getPrimitiveSizeInBits() == 32);
2512 SmallVector<uint32_t, 32> Elements;
2513 Elements.reserve(NumElements);
2514
2515 for(unsigned i = 0, e = E->getLength(); i != e; ++i)
2516 Elements.push_back(E->getCodeUnit(i));
2517 Elements.resize(NumElements);
2518 return llvm::ConstantDataArray::get(VMContext, Elements);
Eli Friedman64f45a22011-11-01 02:23:42 +00002519}
2520
Daniel Dunbar61432932008-08-13 23:20:05 +00002521/// GetAddrOfConstantStringFromLiteral - Return a pointer to a
2522/// constant array for the given string literal.
2523llvm::Constant *
2524CodeGenModule::GetAddrOfConstantStringFromLiteral(const StringLiteral *S) {
Ulrich Weigand6b203512013-05-06 16:23:57 +00002525 CharUnits Align = getContext().getAlignOfGlobalVarInChars(S->getType());
Eli Friedman64f45a22011-11-01 02:23:42 +00002526 if (S->isAscii() || S->isUTF8()) {
Chris Lattner812234b2012-02-06 22:47:00 +00002527 SmallString<64> Str(S->getString());
2528
2529 // Resize the string to the right size, which is indicated by its type.
2530 const ConstantArrayType *CAT = Context.getAsConstantArrayType(S->getType());
2531 Str.resize(CAT->getSize().getZExtValue());
2532 return GetAddrOfConstantString(Str, /*GlobalName*/ 0, Align.getQuantity());
Eli Friedman7eb79c12009-11-16 05:55:46 +00002533 }
Eli Friedman64f45a22011-11-01 02:23:42 +00002534
Chris Lattner812234b2012-02-06 22:47:00 +00002535 // FIXME: the following does not memoize wide strings.
Eli Friedman64f45a22011-11-01 02:23:42 +00002536 llvm::Constant *C = GetConstantArrayFromStringLiteral(S);
2537 llvm::GlobalVariable *GV =
2538 new llvm::GlobalVariable(getModule(),C->getType(),
David Blaikie4e4d0842012-03-11 07:00:24 +00002539 !LangOpts.WritableStrings,
Eli Friedman64f45a22011-11-01 02:23:42 +00002540 llvm::GlobalValue::PrivateLinkage,
2541 C,".str");
Seth Cantrell7d6a7c02012-01-18 12:11:32 +00002542
Eli Friedman64f45a22011-11-01 02:23:42 +00002543 GV->setAlignment(Align.getQuantity());
2544 GV->setUnnamedAddr(true);
Eli Friedman64f45a22011-11-01 02:23:42 +00002545 return GV;
Daniel Dunbar61432932008-08-13 23:20:05 +00002546}
2547
Chris Lattnereaf2bb82009-02-24 22:18:39 +00002548/// GetAddrOfConstantStringFromObjCEncode - Return a pointer to a constant
2549/// array for the given ObjCEncodeExpr node.
2550llvm::Constant *
2551CodeGenModule::GetAddrOfConstantStringFromObjCEncode(const ObjCEncodeExpr *E) {
2552 std::string Str;
2553 getContext().getObjCEncodingForType(E->getEncodedType(), Str);
Eli Friedmana210f352009-03-07 20:17:55 +00002554
2555 return GetAddrOfConstantCString(Str);
Chris Lattnereaf2bb82009-02-24 22:18:39 +00002556}
2557
2558
Chris Lattnera7ad98f2008-02-11 00:02:17 +00002559/// GenerateWritableString -- Creates storage for a string literal.
John McCalla5e19c62011-08-04 01:03:22 +00002560static llvm::GlobalVariable *GenerateStringLiteral(StringRef str,
Chris Lattner45e8cbd2007-11-28 05:34:05 +00002561 bool constant,
Daniel Dunbar5fabf9d2008-10-17 21:56:50 +00002562 CodeGenModule &CGM,
John McCalla5e19c62011-08-04 01:03:22 +00002563 const char *GlobalName,
2564 unsigned Alignment) {
Daniel Dunbar61432932008-08-13 23:20:05 +00002565 // Create Constant for this string literal. Don't add a '\0'.
Owen Anderson0032b272009-08-13 21:57:51 +00002566 llvm::Constant *C =
Chris Lattner94010692012-02-05 02:30:40 +00002567 llvm::ConstantDataArray::getString(CGM.getLLVMContext(), str, false);
Mike Stump1eb44332009-09-09 15:08:12 +00002568
Chris Lattner45e8cbd2007-11-28 05:34:05 +00002569 // Create a global variable for this string
Rafael Espindola1257bc62011-01-10 22:34:03 +00002570 llvm::GlobalVariable *GV =
2571 new llvm::GlobalVariable(CGM.getModule(), C->getType(), constant,
2572 llvm::GlobalValue::PrivateLinkage,
2573 C, GlobalName);
John McCalla5e19c62011-08-04 01:03:22 +00002574 GV->setAlignment(Alignment);
Rafael Espindola1257bc62011-01-10 22:34:03 +00002575 GV->setUnnamedAddr(true);
2576 return GV;
Chris Lattner45e8cbd2007-11-28 05:34:05 +00002577}
2578
Daniel Dunbar61432932008-08-13 23:20:05 +00002579/// GetAddrOfConstantString - Returns a pointer to a character array
2580/// containing the literal. This contents are exactly that of the
2581/// given string, i.e. it will not be null terminated automatically;
2582/// see GetAddrOfConstantCString. Note that whether the result is
2583/// actually a pointer to an LLVM constant depends on
2584/// Feature.WriteableStrings.
2585///
2586/// The result has pointer to array type.
Chris Lattner5f9e2722011-07-23 10:55:15 +00002587llvm::Constant *CodeGenModule::GetAddrOfConstantString(StringRef Str,
John McCalla5e19c62011-08-04 01:03:22 +00002588 const char *GlobalName,
2589 unsigned Alignment) {
Daniel Dunbar8e5c2b82009-03-31 23:42:16 +00002590 // Get the default prefix if a name wasn't specified.
2591 if (!GlobalName)
Chris Lattner95b851e2009-07-16 05:03:48 +00002592 GlobalName = ".str";
Daniel Dunbar8e5c2b82009-03-31 23:42:16 +00002593
Ulrich Weigand6b203512013-05-06 16:23:57 +00002594 if (Alignment == 0)
2595 Alignment = getContext().getAlignOfGlobalVarInChars(getContext().CharTy)
2596 .getQuantity();
2597
Daniel Dunbar8e5c2b82009-03-31 23:42:16 +00002598 // Don't share any string literals if strings aren't constant.
David Blaikie4e4d0842012-03-11 07:00:24 +00002599 if (LangOpts.WritableStrings)
John McCalla5e19c62011-08-04 01:03:22 +00002600 return GenerateStringLiteral(Str, false, *this, GlobalName, Alignment);
Mike Stump1eb44332009-09-09 15:08:12 +00002601
John McCalla5e19c62011-08-04 01:03:22 +00002602 llvm::StringMapEntry<llvm::GlobalVariable *> &Entry =
Benjamin Kramer9de43422011-03-05 13:45:23 +00002603 ConstantStringMap.GetOrCreateValue(Str);
Chris Lattner45e8cbd2007-11-28 05:34:05 +00002604
John McCalla5e19c62011-08-04 01:03:22 +00002605 if (llvm::GlobalVariable *GV = Entry.getValue()) {
2606 if (Alignment > GV->getAlignment()) {
2607 GV->setAlignment(Alignment);
2608 }
2609 return GV;
2610 }
Chris Lattner45e8cbd2007-11-28 05:34:05 +00002611
2612 // Create a global variable for this.
Chris Lattner812234b2012-02-06 22:47:00 +00002613 llvm::GlobalVariable *GV = GenerateStringLiteral(Str, true, *this, GlobalName,
2614 Alignment);
John McCalla5e19c62011-08-04 01:03:22 +00002615 Entry.setValue(GV);
2616 return GV;
Chris Lattner45e8cbd2007-11-28 05:34:05 +00002617}
Daniel Dunbar61432932008-08-13 23:20:05 +00002618
2619/// GetAddrOfConstantCString - Returns a pointer to a character
Benjamin Kramer9de43422011-03-05 13:45:23 +00002620/// array containing the literal and a terminating '\0'
Daniel Dunbar61432932008-08-13 23:20:05 +00002621/// character. The result has pointer to array type.
Benjamin Kramer9de43422011-03-05 13:45:23 +00002622llvm::Constant *CodeGenModule::GetAddrOfConstantCString(const std::string &Str,
John McCalla5e19c62011-08-04 01:03:22 +00002623 const char *GlobalName,
2624 unsigned Alignment) {
Chris Lattner5f9e2722011-07-23 10:55:15 +00002625 StringRef StrWithNull(Str.c_str(), Str.size() + 1);
John McCalla5e19c62011-08-04 01:03:22 +00002626 return GetAddrOfConstantString(StrWithNull, GlobalName, Alignment);
Daniel Dunbar61432932008-08-13 23:20:05 +00002627}
Daniel Dunbar41071de2008-08-15 23:26:23 +00002628
Richard Smith211c8dd2013-06-05 00:46:14 +00002629llvm::Constant *CodeGenModule::GetAddrOfGlobalTemporary(
Richard Smith3282b842013-06-14 03:07:01 +00002630 const MaterializeTemporaryExpr *E, const Expr *Init) {
Richard Smith211c8dd2013-06-05 00:46:14 +00002631 assert((E->getStorageDuration() == SD_Static ||
2632 E->getStorageDuration() == SD_Thread) && "not a global temporary");
2633 const VarDecl *VD = cast<VarDecl>(E->getExtendingDecl());
2634
2635 // If we're not materializing a subobject of the temporary, keep the
2636 // cv-qualifiers from the type of the MaterializeTemporaryExpr.
Richard Smith3282b842013-06-14 03:07:01 +00002637 QualType MaterializedType = Init->getType();
2638 if (Init == E->GetTemporaryExpr())
2639 MaterializedType = E->getType();
Richard Smith211c8dd2013-06-05 00:46:14 +00002640
2641 llvm::Constant *&Slot = MaterializedGlobalTemporaryMap[E];
2642 if (Slot)
2643 return Slot;
2644
2645 // FIXME: If an externally-visible declaration extends multiple temporaries,
2646 // we need to give each temporary the same name in every translation unit (and
2647 // we also need to make the temporaries externally-visible).
2648 SmallString<256> Name;
2649 llvm::raw_svector_ostream Out(Name);
2650 getCXXABI().getMangleContext().mangleReferenceTemporary(VD, Out);
2651 Out.flush();
2652
Richard Smith211c8dd2013-06-05 00:46:14 +00002653 APValue *Value = 0;
2654 if (E->getStorageDuration() == SD_Static) {
Richard Smith3282b842013-06-14 03:07:01 +00002655 // We might have a cached constant initializer for this temporary. Note
2656 // that this might have a different value from the value computed by
2657 // evaluating the initializer if the surrounding constant expression
2658 // modifies the temporary.
Richard Smith211c8dd2013-06-05 00:46:14 +00002659 Value = getContext().getMaterializedTemporaryValue(E, false);
2660 if (Value && Value->isUninit())
2661 Value = 0;
2662 }
2663
Richard Smith3282b842013-06-14 03:07:01 +00002664 // Try evaluating it now, it might have a constant initializer.
2665 Expr::EvalResult EvalResult;
2666 if (!Value && Init->EvaluateAsRValue(EvalResult, getContext()) &&
2667 !EvalResult.hasSideEffects())
2668 Value = &EvalResult.Val;
2669
2670 llvm::Constant *InitialValue = 0;
2671 bool Constant = false;
2672 llvm::Type *Type;
Richard Smith211c8dd2013-06-05 00:46:14 +00002673 if (Value) {
2674 // The temporary has a constant initializer, use it.
Richard Smith3282b842013-06-14 03:07:01 +00002675 InitialValue = EmitConstantValue(*Value, MaterializedType, 0);
2676 Constant = isTypeConstant(MaterializedType, /*ExcludeCtor*/Value);
2677 Type = InitialValue->getType();
Richard Smith211c8dd2013-06-05 00:46:14 +00002678 } else {
Richard Smith3282b842013-06-14 03:07:01 +00002679 // No initializer, the initialization will be provided when we
Richard Smith211c8dd2013-06-05 00:46:14 +00002680 // initialize the declaration which performed lifetime extension.
Richard Smith3282b842013-06-14 03:07:01 +00002681 Type = getTypes().ConvertTypeForMem(MaterializedType);
Richard Smith211c8dd2013-06-05 00:46:14 +00002682 }
2683
2684 // Create a global variable for this lifetime-extended temporary.
2685 llvm::GlobalVariable *GV =
Richard Smith3282b842013-06-14 03:07:01 +00002686 new llvm::GlobalVariable(getModule(), Type, Constant,
2687 llvm::GlobalValue::PrivateLinkage,
2688 InitialValue, Name.c_str());
Richard Smith211c8dd2013-06-05 00:46:14 +00002689 GV->setAlignment(
Richard Smith3282b842013-06-14 03:07:01 +00002690 getContext().getTypeAlignInChars(MaterializedType).getQuantity());
Richard Smith211c8dd2013-06-05 00:46:14 +00002691 if (VD->getTLSKind())
2692 setTLSMode(GV, *VD);
2693 Slot = GV;
2694 return GV;
2695}
2696
Daniel Dunbaraf05bb92008-08-26 08:29:31 +00002697/// EmitObjCPropertyImplementations - Emit information for synthesized
2698/// properties for an implementation.
Mike Stump1eb44332009-09-09 15:08:12 +00002699void CodeGenModule::EmitObjCPropertyImplementations(const
Daniel Dunbaraf05bb92008-08-26 08:29:31 +00002700 ObjCImplementationDecl *D) {
Mike Stump1eb44332009-09-09 15:08:12 +00002701 for (ObjCImplementationDecl::propimpl_iterator
Argyrios Kyrtzidis17945a02009-06-30 02:36:12 +00002702 i = D->propimpl_begin(), e = D->propimpl_end(); i != e; ++i) {
David Blaikie581deb32012-06-06 20:45:41 +00002703 ObjCPropertyImplDecl *PID = *i;
Mike Stump1eb44332009-09-09 15:08:12 +00002704
Daniel Dunbaraf05bb92008-08-26 08:29:31 +00002705 // Dynamic is just for type-checking.
2706 if (PID->getPropertyImplementation() == ObjCPropertyImplDecl::Synthesize) {
2707 ObjCPropertyDecl *PD = PID->getPropertyDecl();
2708
2709 // Determine which methods need to be implemented, some may have
Jordan Rose1e4691b2012-10-10 16:42:25 +00002710 // been overridden. Note that ::isPropertyAccessor is not the method
Daniel Dunbaraf05bb92008-08-26 08:29:31 +00002711 // we want, that just indicates if the decl came from a
2712 // property. What we want to know is if the method is defined in
2713 // this implementation.
Argyrios Kyrtzidis17945a02009-06-30 02:36:12 +00002714 if (!D->getInstanceMethod(PD->getGetterName()))
Fariborz Jahanianfef30b52008-12-09 20:23:04 +00002715 CodeGenFunction(*this).GenerateObjCGetter(
2716 const_cast<ObjCImplementationDecl *>(D), PID);
Daniel Dunbaraf05bb92008-08-26 08:29:31 +00002717 if (!PD->isReadOnly() &&
Argyrios Kyrtzidis17945a02009-06-30 02:36:12 +00002718 !D->getInstanceMethod(PD->getSetterName()))
Fariborz Jahanianfef30b52008-12-09 20:23:04 +00002719 CodeGenFunction(*this).GenerateObjCSetter(
2720 const_cast<ObjCImplementationDecl *>(D), PID);
Daniel Dunbaraf05bb92008-08-26 08:29:31 +00002721 }
2722 }
2723}
2724
John McCalle81ac692011-03-22 07:05:39 +00002725static bool needsDestructMethod(ObjCImplementationDecl *impl) {
Jordy Rosedb8264e2011-07-22 02:08:32 +00002726 const ObjCInterfaceDecl *iface = impl->getClassInterface();
2727 for (const ObjCIvarDecl *ivar = iface->all_declared_ivar_begin();
John McCalle81ac692011-03-22 07:05:39 +00002728 ivar; ivar = ivar->getNextIvar())
2729 if (ivar->getType().isDestructedType())
2730 return true;
2731
2732 return false;
2733}
2734
Fariborz Jahanian109dfc62010-04-28 21:28:56 +00002735/// EmitObjCIvarInitializations - Emit information for ivar initialization
2736/// for an implementation.
2737void CodeGenModule::EmitObjCIvarInitializations(ObjCImplementationDecl *D) {
John McCalle81ac692011-03-22 07:05:39 +00002738 // We might need a .cxx_destruct even if we don't have any ivar initializers.
2739 if (needsDestructMethod(D)) {
2740 IdentifierInfo *II = &getContext().Idents.get(".cxx_destruct");
2741 Selector cxxSelector = getContext().Selectors.getSelector(0, &II);
2742 ObjCMethodDecl *DTORMethod =
2743 ObjCMethodDecl::Create(getContext(), D->getLocation(), D->getLocation(),
Argyrios Kyrtzidis75cf3e82011-08-17 19:25:08 +00002744 cxxSelector, getContext().VoidTy, 0, D,
2745 /*isInstance=*/true, /*isVariadic=*/false,
Jordan Rose1e4691b2012-10-10 16:42:25 +00002746 /*isPropertyAccessor=*/true, /*isImplicitlyDeclared=*/true,
Argyrios Kyrtzidis75cf3e82011-08-17 19:25:08 +00002747 /*isDefined=*/false, ObjCMethodDecl::Required);
John McCalle81ac692011-03-22 07:05:39 +00002748 D->addInstanceMethod(DTORMethod);
2749 CodeGenFunction(*this).GenerateObjCCtorDtorMethod(D, DTORMethod, false);
John McCallb03527a2012-10-17 04:53:31 +00002750 D->setHasDestructors(true);
John McCalle81ac692011-03-22 07:05:39 +00002751 }
2752
2753 // If the implementation doesn't have any ivar initializers, we don't need
2754 // a .cxx_construct.
David Chisnall827bbcc2011-03-17 14:19:08 +00002755 if (D->getNumIvarInitializers() == 0)
Fariborz Jahanian109dfc62010-04-28 21:28:56 +00002756 return;
Fariborz Jahanian109dfc62010-04-28 21:28:56 +00002757
John McCalle81ac692011-03-22 07:05:39 +00002758 IdentifierInfo *II = &getContext().Idents.get(".cxx_construct");
2759 Selector cxxSelector = getContext().Selectors.getSelector(0, &II);
Fariborz Jahanian109dfc62010-04-28 21:28:56 +00002760 // The constructor returns 'self'.
2761 ObjCMethodDecl *CTORMethod = ObjCMethodDecl::Create(getContext(),
2762 D->getLocation(),
Argyrios Kyrtzidis11d77162011-10-03 06:36:36 +00002763 D->getLocation(),
Argyrios Kyrtzidis11d77162011-10-03 06:36:36 +00002764 cxxSelector,
Fariborz Jahanian109dfc62010-04-28 21:28:56 +00002765 getContext().getObjCIdType(), 0,
Argyrios Kyrtzidis75cf3e82011-08-17 19:25:08 +00002766 D, /*isInstance=*/true,
2767 /*isVariadic=*/false,
Jordan Rose1e4691b2012-10-10 16:42:25 +00002768 /*isPropertyAccessor=*/true,
Argyrios Kyrtzidis75cf3e82011-08-17 19:25:08 +00002769 /*isImplicitlyDeclared=*/true,
2770 /*isDefined=*/false,
Fariborz Jahanian109dfc62010-04-28 21:28:56 +00002771 ObjCMethodDecl::Required);
2772 D->addInstanceMethod(CTORMethod);
2773 CodeGenFunction(*this).GenerateObjCCtorDtorMethod(D, CTORMethod, true);
John McCallb03527a2012-10-17 04:53:31 +00002774 D->setHasNonZeroConstructors(true);
Fariborz Jahanian109dfc62010-04-28 21:28:56 +00002775}
2776
Anders Carlsson91e20dd2009-04-02 05:55:18 +00002777/// EmitNamespace - Emit all declarations in a namespace.
Anders Carlsson984e0682009-04-01 00:58:25 +00002778void CodeGenModule::EmitNamespace(const NamespaceDecl *ND) {
Argyrios Kyrtzidis17945a02009-06-30 02:36:12 +00002779 for (RecordDecl::decl_iterator I = ND->decls_begin(), E = ND->decls_end();
Anders Carlsson984e0682009-04-01 00:58:25 +00002780 I != E; ++I)
2781 EmitTopLevelDecl(*I);
2782}
2783
Anders Carlsson91e20dd2009-04-02 05:55:18 +00002784// EmitLinkageSpec - Emit all declarations in a linkage spec.
2785void CodeGenModule::EmitLinkageSpec(const LinkageSpecDecl *LSD) {
Eli Friedmanf976be82009-08-01 20:48:04 +00002786 if (LSD->getLanguage() != LinkageSpecDecl::lang_c &&
2787 LSD->getLanguage() != LinkageSpecDecl::lang_cxx) {
Anders Carlsson91e20dd2009-04-02 05:55:18 +00002788 ErrorUnsupported(LSD, "linkage spec");
2789 return;
2790 }
2791
Argyrios Kyrtzidis17945a02009-06-30 02:36:12 +00002792 for (RecordDecl::decl_iterator I = LSD->decls_begin(), E = LSD->decls_end();
Fariborz Jahanianc1868e52012-10-26 20:22:11 +00002793 I != E; ++I) {
Fariborz Jahanian107dae42012-10-26 22:20:25 +00002794 // Meta-data for ObjC class includes references to implemented methods.
2795 // Generate class's method definitions first.
Fariborz Jahanianc1868e52012-10-26 20:22:11 +00002796 if (ObjCImplDecl *OID = dyn_cast<ObjCImplDecl>(*I)) {
2797 for (ObjCContainerDecl::method_iterator M = OID->meth_begin(),
2798 MEnd = OID->meth_end();
2799 M != MEnd; ++M)
2800 EmitTopLevelDecl(*M);
2801 }
Anders Carlsson91e20dd2009-04-02 05:55:18 +00002802 EmitTopLevelDecl(*I);
Fariborz Jahanianc1868e52012-10-26 20:22:11 +00002803 }
Anders Carlsson91e20dd2009-04-02 05:55:18 +00002804}
2805
Daniel Dunbar41071de2008-08-15 23:26:23 +00002806/// EmitTopLevelDecl - Emit code for a single top level declaration.
2807void CodeGenModule::EmitTopLevelDecl(Decl *D) {
2808 // If an error has occurred, stop code generation, but continue
2809 // parsing and semantic analysis (to ensure all warnings and errors
2810 // are emitted).
2811 if (Diags.hasErrorOccurred())
2812 return;
2813
Douglas Gregor16e8be22009-06-29 17:30:29 +00002814 // Ignore dependent declarations.
2815 if (D->getDeclContext() && D->getDeclContext()->isDependentContext())
2816 return;
Mike Stump1eb44332009-09-09 15:08:12 +00002817
Daniel Dunbar41071de2008-08-15 23:26:23 +00002818 switch (D->getKind()) {
Anders Carlsson293361a2009-08-25 13:14:46 +00002819 case Decl::CXXConversion:
Anders Carlsson2b77ba82009-04-04 20:47:02 +00002820 case Decl::CXXMethod:
Daniel Dunbar41071de2008-08-15 23:26:23 +00002821 case Decl::Function:
Douglas Gregor16e8be22009-06-29 17:30:29 +00002822 // Skip function templates
Francois Pichet8387e2a2011-04-22 22:18:13 +00002823 if (cast<FunctionDecl>(D)->getDescribedFunctionTemplate() ||
2824 cast<FunctionDecl>(D)->isLateTemplateParsed())
Douglas Gregor16e8be22009-06-29 17:30:29 +00002825 return;
Mike Stump1eb44332009-09-09 15:08:12 +00002826
Anders Carlsson555b4bb2009-09-10 23:43:36 +00002827 EmitGlobal(cast<FunctionDecl>(D));
2828 break;
2829
Daniel Dunbar41071de2008-08-15 23:26:23 +00002830 case Decl::Var:
Anders Carlsson555b4bb2009-09-10 23:43:36 +00002831 EmitGlobal(cast<VarDecl>(D));
Daniel Dunbar41071de2008-08-15 23:26:23 +00002832 break;
2833
John McCall26fbc722011-04-12 01:01:22 +00002834 // Indirect fields from global anonymous structs and unions can be
2835 // ignored; only the actual variable requires IR gen support.
2836 case Decl::IndirectField:
2837 break;
2838
Anders Carlsson95d4e5d2009-04-15 15:55:24 +00002839 // C++ Decls
Daniel Dunbar41071de2008-08-15 23:26:23 +00002840 case Decl::Namespace:
Anders Carlsson984e0682009-04-01 00:58:25 +00002841 EmitNamespace(cast<NamespaceDecl>(D));
Daniel Dunbar41071de2008-08-15 23:26:23 +00002842 break;
Douglas Gregor9cfbe482009-06-20 00:51:54 +00002843 // No code generation needed.
John McCall9d0c6612009-11-17 09:33:40 +00002844 case Decl::UsingShadow:
Douglas Gregor9cfbe482009-06-20 00:51:54 +00002845 case Decl::Using:
Douglas Gregor127102b2009-06-29 20:59:39 +00002846 case Decl::ClassTemplate:
2847 case Decl::FunctionTemplate:
Richard Smith3e4c6c42011-05-05 21:57:07 +00002848 case Decl::TypeAliasTemplate:
Douglas Gregor6a576ab2011-06-05 05:04:23 +00002849 case Decl::Block:
Michael Han684aa732013-02-22 17:15:32 +00002850 case Decl::Empty:
Douglas Gregor9cfbe482009-06-20 00:51:54 +00002851 break;
David Blaikiefc46ebc2013-05-20 22:50:41 +00002852 case Decl::NamespaceAlias:
2853 if (CGDebugInfo *DI = getModuleDebugInfo())
2854 DI->EmitNamespaceAlias(cast<NamespaceAliasDecl>(*D));
2855 return;
David Blaikie1601a4a2013-04-26 05:41:06 +00002856 case Decl::UsingDirective: // using namespace X; [C++]
2857 if (CGDebugInfo *DI = getModuleDebugInfo())
2858 DI->EmitUsingDirective(cast<UsingDirectiveDecl>(*D));
2859 return;
Anders Carlsson95d4e5d2009-04-15 15:55:24 +00002860 case Decl::CXXConstructor:
Anders Carlsson1fe598c2009-11-24 05:16:24 +00002861 // Skip function templates
Francois Pichet8387e2a2011-04-22 22:18:13 +00002862 if (cast<FunctionDecl>(D)->getDescribedFunctionTemplate() ||
2863 cast<FunctionDecl>(D)->isLateTemplateParsed())
Anders Carlsson1fe598c2009-11-24 05:16:24 +00002864 return;
2865
Anders Carlsson95d4e5d2009-04-15 15:55:24 +00002866 EmitCXXConstructors(cast<CXXConstructorDecl>(D));
2867 break;
Anders Carlsson27ae5362009-04-17 01:58:57 +00002868 case Decl::CXXDestructor:
Francois Pichet8387e2a2011-04-22 22:18:13 +00002869 if (cast<FunctionDecl>(D)->isLateTemplateParsed())
2870 return;
Anders Carlsson27ae5362009-04-17 01:58:57 +00002871 EmitCXXDestructors(cast<CXXDestructorDecl>(D));
2872 break;
Anders Carlsson36674d22009-06-11 21:22:55 +00002873
2874 case Decl::StaticAssert:
2875 // Nothing to do.
2876 break;
2877
Anders Carlsson95d4e5d2009-04-15 15:55:24 +00002878 // Objective-C Decls
Mike Stump1eb44332009-09-09 15:08:12 +00002879
Fariborz Jahanian38e24c72009-03-18 22:33:24 +00002880 // Forward declarations, no (immediate) code generation.
Chris Lattner285d0db2009-04-01 02:36:43 +00002881 case Decl::ObjCInterface:
Eric Christopherffb0c3a2012-07-19 22:22:55 +00002882 case Decl::ObjCCategory:
Chris Lattner285d0db2009-04-01 02:36:43 +00002883 break;
2884
Douglas Gregorbd9482d2012-01-01 21:23:57 +00002885 case Decl::ObjCProtocol: {
2886 ObjCProtocolDecl *Proto = cast<ObjCProtocolDecl>(D);
2887 if (Proto->isThisDeclarationADefinition())
2888 ObjCRuntime->GenerateProtocol(Proto);
Daniel Dunbar41071de2008-08-15 23:26:23 +00002889 break;
Douglas Gregorbd9482d2012-01-01 21:23:57 +00002890 }
2891
Daniel Dunbar41071de2008-08-15 23:26:23 +00002892 case Decl::ObjCCategoryImpl:
Daniel Dunbaraf05bb92008-08-26 08:29:31 +00002893 // Categories have properties but don't support synthesize so we
2894 // can ignore them here.
Peter Collingbournee9265232011-07-27 20:29:46 +00002895 ObjCRuntime->GenerateCategory(cast<ObjCCategoryImplDecl>(D));
Daniel Dunbar41071de2008-08-15 23:26:23 +00002896 break;
2897
Daniel Dunbaraf05bb92008-08-26 08:29:31 +00002898 case Decl::ObjCImplementation: {
2899 ObjCImplementationDecl *OMD = cast<ObjCImplementationDecl>(D);
2900 EmitObjCPropertyImplementations(OMD);
Fariborz Jahanian109dfc62010-04-28 21:28:56 +00002901 EmitObjCIvarInitializations(OMD);
Peter Collingbournee9265232011-07-27 20:29:46 +00002902 ObjCRuntime->GenerateClass(OMD);
Eric Christopherbe6c6862012-04-11 05:56:05 +00002903 // Emit global variable debug information.
2904 if (CGDebugInfo *DI = getModuleDebugInfo())
Alexey Samsonov96a66392012-12-03 18:28:12 +00002905 if (getCodeGenOpts().getDebugInfo() >= CodeGenOptions::LimitedDebugInfo)
2906 DI->getOrCreateInterfaceType(getContext().getObjCInterfaceType(
2907 OMD->getClassInterface()), OMD->getLocation());
Daniel Dunbar41071de2008-08-15 23:26:23 +00002908 break;
Mike Stump1eb44332009-09-09 15:08:12 +00002909 }
Daniel Dunbar41071de2008-08-15 23:26:23 +00002910 case Decl::ObjCMethod: {
2911 ObjCMethodDecl *OMD = cast<ObjCMethodDecl>(D);
2912 // If this is not a prototype, emit the body.
Argyrios Kyrtzidis6fb0aee2009-06-30 02:35:26 +00002913 if (OMD->getBody())
Daniel Dunbar41071de2008-08-15 23:26:23 +00002914 CodeGenFunction(*this).GenerateObjCMethod(OMD);
2915 break;
2916 }
Mike Stump1eb44332009-09-09 15:08:12 +00002917 case Decl::ObjCCompatibleAlias:
David Chisnall29254f42012-01-31 18:59:20 +00002918 ObjCRuntime->RegisterAlias(cast<ObjCCompatibleAliasDecl>(D));
Daniel Dunbar41071de2008-08-15 23:26:23 +00002919 break;
2920
Anders Carlsson91e20dd2009-04-02 05:55:18 +00002921 case Decl::LinkageSpec:
2922 EmitLinkageSpec(cast<LinkageSpecDecl>(D));
Daniel Dunbar41071de2008-08-15 23:26:23 +00002923 break;
Daniel Dunbar41071de2008-08-15 23:26:23 +00002924
2925 case Decl::FileScopeAsm: {
2926 FileScopeAsmDecl *AD = cast<FileScopeAsmDecl>(D);
Chris Lattner5f9e2722011-07-23 10:55:15 +00002927 StringRef AsmString = AD->getAsmString()->getString();
Mike Stump1eb44332009-09-09 15:08:12 +00002928
Daniel Dunbar41071de2008-08-15 23:26:23 +00002929 const std::string &S = getModule().getModuleInlineAsm();
2930 if (S.empty())
2931 getModule().setModuleInlineAsm(AsmString);
Joerg Sonnenberger8ce9cca2012-08-10 10:57:52 +00002932 else if (S.end()[-1] == '\n')
Chris Lattner9f5bff02011-07-23 20:04:25 +00002933 getModule().setModuleInlineAsm(S + AsmString.str());
Daniel Dunbar41071de2008-08-15 23:26:23 +00002934 else
Benjamin Kramer8d042582009-12-11 13:33:18 +00002935 getModule().setModuleInlineAsm(S + '\n' + AsmString.str());
Daniel Dunbar41071de2008-08-15 23:26:23 +00002936 break;
2937 }
Mike Stump1eb44332009-09-09 15:08:12 +00002938
Douglas Gregorb6cbe512013-01-14 17:21:00 +00002939 case Decl::Import: {
2940 ImportDecl *Import = cast<ImportDecl>(D);
2941
2942 // Ignore import declarations that come from imported modules.
2943 if (clang::Module *Owner = Import->getOwningModule()) {
2944 if (getLangOpts().CurrentModule.empty() ||
2945 Owner->getTopLevelModule()->Name == getLangOpts().CurrentModule)
2946 break;
2947 }
2948
Douglas Gregor858afb32013-01-14 20:53:57 +00002949 ImportedModules.insert(Import->getImportedModule());
Douglas Gregorb6cbe512013-01-14 17:21:00 +00002950 break;
2951 }
2952
Mike Stump1eb44332009-09-09 15:08:12 +00002953 default:
Mike Stumpf5408fe2009-05-16 07:57:57 +00002954 // Make sure we handled everything we should, every other kind is a
2955 // non-top-level decl. FIXME: Would be nice to have an isTopLevelDeclKind
2956 // function. Need to recode Decl::Kind to do that easily.
Daniel Dunbar41071de2008-08-15 23:26:23 +00002957 assert(isa<TypeDecl>(D) && "Unsupported decl kind");
2958 }
2959}
John McCall744016d2010-07-06 23:57:41 +00002960
2961/// Turns the given pointer into a constant.
2962static llvm::Constant *GetPointerConstant(llvm::LLVMContext &Context,
2963 const void *Ptr) {
2964 uintptr_t PtrInt = reinterpret_cast<uintptr_t>(Ptr);
Chris Lattner2acc6e32011-07-18 04:24:23 +00002965 llvm::Type *i64 = llvm::Type::getInt64Ty(Context);
John McCall744016d2010-07-06 23:57:41 +00002966 return llvm::ConstantInt::get(i64, PtrInt);
2967}
2968
2969static void EmitGlobalDeclMetadata(CodeGenModule &CGM,
2970 llvm::NamedMDNode *&GlobalMetadata,
2971 GlobalDecl D,
2972 llvm::GlobalValue *Addr) {
2973 if (!GlobalMetadata)
2974 GlobalMetadata =
2975 CGM.getModule().getOrInsertNamedMetadata("clang.global.decl.ptrs");
2976
2977 // TODO: should we report variant information for ctors/dtors?
2978 llvm::Value *Ops[] = {
2979 Addr,
2980 GetPointerConstant(CGM.getLLVMContext(), D.getDecl())
2981 };
Jay Foad6f141652011-04-21 19:59:12 +00002982 GlobalMetadata->addOperand(llvm::MDNode::get(CGM.getLLVMContext(), Ops));
John McCall744016d2010-07-06 23:57:41 +00002983}
2984
Richard Smith00249372013-04-06 05:00:46 +00002985/// For each function which is declared within an extern "C" region and marked
2986/// as 'used', but has internal linkage, create an alias from the unmangled
2987/// name to the mangled name if possible. People expect to be able to refer
2988/// to such functions with an unmangled name from inline assembly within the
2989/// same translation unit.
2990void CodeGenModule::EmitStaticExternCAliases() {
Richard Smith84083b72013-04-13 01:28:18 +00002991 for (StaticExternCMap::iterator I = StaticExternCValues.begin(),
2992 E = StaticExternCValues.end();
2993 I != E; ++I) {
2994 IdentifierInfo *Name = I->first;
2995 llvm::GlobalValue *Val = I->second;
Richard Smith67972042013-04-06 07:07:44 +00002996 if (Val && !getModule().getNamedValue(Name->getName()))
2997 AddUsedGlobal(new llvm::GlobalAlias(Val->getType(), Val->getLinkage(),
2998 Name->getName(), Val, &getModule()));
2999 }
Richard Smith00249372013-04-06 05:00:46 +00003000}
3001
John McCall744016d2010-07-06 23:57:41 +00003002/// Emits metadata nodes associating all the global values in the
3003/// current module with the Decls they came from. This is useful for
3004/// projects using IR gen as a subroutine.
3005///
3006/// Since there's currently no way to associate an MDNode directly
3007/// with an llvm::GlobalValue, we create a global named metadata
3008/// with the name 'clang.global.decl.ptrs'.
3009void CodeGenModule::EmitDeclMetadata() {
3010 llvm::NamedMDNode *GlobalMetadata = 0;
3011
3012 // StaticLocalDeclMap
Chris Lattner5f9e2722011-07-23 10:55:15 +00003013 for (llvm::DenseMap<GlobalDecl,StringRef>::iterator
John McCall744016d2010-07-06 23:57:41 +00003014 I = MangledDeclNames.begin(), E = MangledDeclNames.end();
3015 I != E; ++I) {
3016 llvm::GlobalValue *Addr = getModule().getNamedValue(I->second);
3017 EmitGlobalDeclMetadata(*this, GlobalMetadata, I->first, Addr);
3018 }
3019}
3020
3021/// Emits metadata nodes for all the local variables in the current
3022/// function.
3023void CodeGenFunction::EmitDeclMetadata() {
3024 if (LocalDeclMap.empty()) return;
3025
3026 llvm::LLVMContext &Context = getLLVMContext();
3027
3028 // Find the unique metadata ID for this name.
3029 unsigned DeclPtrKind = Context.getMDKindID("clang.decl.ptr");
3030
3031 llvm::NamedMDNode *GlobalMetadata = 0;
3032
3033 for (llvm::DenseMap<const Decl*, llvm::Value*>::iterator
3034 I = LocalDeclMap.begin(), E = LocalDeclMap.end(); I != E; ++I) {
3035 const Decl *D = I->first;
3036 llvm::Value *Addr = I->second;
3037
3038 if (llvm::AllocaInst *Alloca = dyn_cast<llvm::AllocaInst>(Addr)) {
3039 llvm::Value *DAddr = GetPointerConstant(getLLVMContext(), D);
Jay Foad6f141652011-04-21 19:59:12 +00003040 Alloca->setMetadata(DeclPtrKind, llvm::MDNode::get(Context, DAddr));
John McCall744016d2010-07-06 23:57:41 +00003041 } else if (llvm::GlobalValue *GV = dyn_cast<llvm::GlobalValue>(Addr)) {
3042 GlobalDecl GD = GlobalDecl(cast<VarDecl>(D));
3043 EmitGlobalDeclMetadata(CGM, GlobalMetadata, GD, GV);
3044 }
3045 }
3046}
Daniel Dunbar673431a2010-07-16 00:00:15 +00003047
Nick Lewycky3dc05412011-05-05 00:08:20 +00003048void CodeGenModule::EmitCoverageFile() {
3049 if (!getCodeGenOpts().CoverageFile.empty()) {
Nick Lewycky5ea4f442011-05-04 20:46:58 +00003050 if (llvm::NamedMDNode *CUNode = TheModule.getNamedMetadata("llvm.dbg.cu")) {
3051 llvm::NamedMDNode *GCov = TheModule.getOrInsertNamedMetadata("llvm.gcov");
3052 llvm::LLVMContext &Ctx = TheModule.getContext();
Nick Lewycky3dc05412011-05-05 00:08:20 +00003053 llvm::MDString *CoverageFile =
3054 llvm::MDString::get(Ctx, getCodeGenOpts().CoverageFile);
Nick Lewycky5ea4f442011-05-04 20:46:58 +00003055 for (int i = 0, e = CUNode->getNumOperands(); i != e; ++i) {
3056 llvm::MDNode *CU = CUNode->getOperand(i);
Nick Lewycky3dc05412011-05-05 00:08:20 +00003057 llvm::Value *node[] = { CoverageFile, CU };
Nick Lewycky5ea4f442011-05-04 20:46:58 +00003058 llvm::MDNode *N = llvm::MDNode::get(Ctx, node);
3059 GCov->addOperand(N);
3060 }
3061 }
3062 }
3063}
Nico Weberc5f80462012-10-11 10:13:44 +00003064
3065llvm::Constant *CodeGenModule::EmitUuidofInitializer(StringRef Uuid,
3066 QualType GuidType) {
3067 // Sema has checked that all uuid strings are of the form
3068 // "12345678-1234-1234-1234-1234567890ab".
3069 assert(Uuid.size() == 36);
3070 const char *Uuidstr = Uuid.data();
3071 for (int i = 0; i < 36; ++i) {
3072 if (i == 8 || i == 13 || i == 18 || i == 23) assert(Uuidstr[i] == '-');
Jordan Rose3f6f51e2013-02-08 22:30:41 +00003073 else assert(isHexDigit(Uuidstr[i]));
Nico Weberc5f80462012-10-11 10:13:44 +00003074 }
3075
3076 llvm::APInt Field0(32, StringRef(Uuidstr , 8), 16);
3077 llvm::APInt Field1(16, StringRef(Uuidstr + 9, 4), 16);
3078 llvm::APInt Field2(16, StringRef(Uuidstr + 14, 4), 16);
Nico Weber193646f2012-10-17 00:34:34 +00003079 static const int Field3ValueOffsets[] = { 19, 21, 24, 26, 28, 30, 32, 34 };
Nico Weberc5f80462012-10-11 10:13:44 +00003080
3081 APValue InitStruct(APValue::UninitStruct(), /*NumBases=*/0, /*NumFields=*/4);
3082 InitStruct.getStructField(0) = APValue(llvm::APSInt(Field0));
3083 InitStruct.getStructField(1) = APValue(llvm::APSInt(Field1));
3084 InitStruct.getStructField(2) = APValue(llvm::APSInt(Field2));
3085 APValue& Arr = InitStruct.getStructField(3);
3086 Arr = APValue(APValue::UninitArray(), 8, 8);
3087 for (int t = 0; t < 8; ++t)
Nico Weber43085812012-10-13 21:56:05 +00003088 Arr.getArrayInitializedElt(t) = APValue(llvm::APSInt(
3089 llvm::APInt(8, StringRef(Uuidstr + Field3ValueOffsets[t], 2), 16)));
Nico Weberc5f80462012-10-11 10:13:44 +00003090
3091 return EmitConstantValue(InitStruct, GuidType);
3092}