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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
Rafael Espindolac4850c22011-02-10 23:59:36 +0000438 getCXXABI().getMangleContext().mangleName(ND, Out);
Anders Carlsson793a9902010-06-22 16:05:32 +0000439
440 // Allocate space for the mangled name.
Rafael Espindolac4850c22011-02-10 23:59:36 +0000441 Out.flush();
Anders Carlsson793a9902010-06-22 16:05:32 +0000442 size_t Length = Buffer.size();
443 char *Name = MangledNamesAllocator.Allocate<char>(Length);
444 std::copy(Buffer.begin(), Buffer.end(), Name);
445
Chris Lattner5f9e2722011-07-23 10:55:15 +0000446 Str = StringRef(Name, Length);
Anders Carlsson793a9902010-06-22 16:05:32 +0000447
448 return Str;
449}
450
Peter Collingbourne14110472011-01-13 18:57:25 +0000451void CodeGenModule::getBlockMangledName(GlobalDecl GD, MangleBuffer &Buffer,
452 const BlockDecl *BD) {
453 MangleContext &MangleCtx = getCXXABI().getMangleContext();
454 const Decl *D = GD.getDecl();
Rafael Espindolac4850c22011-02-10 23:59:36 +0000455 llvm::raw_svector_ostream Out(Buffer.getBuffer());
Peter Collingbourne14110472011-01-13 18:57:25 +0000456 if (D == 0)
Fariborz Jahanian4904bf42012-06-26 16:06:38 +0000457 MangleCtx.mangleGlobalBlock(BD,
458 dyn_cast_or_null<VarDecl>(initializedGlobalDecl.getDecl()), Out);
Peter Collingbourne14110472011-01-13 18:57:25 +0000459 else if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(D))
Rafael Espindolac4850c22011-02-10 23:59:36 +0000460 MangleCtx.mangleCtorBlock(CD, GD.getCtorType(), BD, Out);
Peter Collingbourne14110472011-01-13 18:57:25 +0000461 else if (const CXXDestructorDecl *DD = dyn_cast<CXXDestructorDecl>(D))
Rafael Espindolac4850c22011-02-10 23:59:36 +0000462 MangleCtx.mangleDtorBlock(DD, GD.getDtorType(), BD, Out);
Peter Collingbourne14110472011-01-13 18:57:25 +0000463 else
Rafael Espindolac4850c22011-02-10 23:59:36 +0000464 MangleCtx.mangleBlock(cast<DeclContext>(D), BD, Out);
Anders Carlsson9a8822b2010-06-09 02:36:32 +0000465}
466
Chris Lattner5f9e2722011-07-23 10:55:15 +0000467llvm::GlobalValue *CodeGenModule::GetGlobalValue(StringRef Name) {
John McCallf746aa62010-03-19 23:29:14 +0000468 return getModule().getNamedValue(Name);
Douglas Gregor5f2bfd42009-02-13 00:10:09 +0000469}
470
Chris Lattner6d397602008-03-14 17:18:18 +0000471/// AddGlobalCtor - Add a function to the list that will be called before
472/// main() runs.
Daniel Dunbar6bfed7e2008-08-01 00:01:51 +0000473void CodeGenModule::AddGlobalCtor(llvm::Function * Ctor, int Priority) {
Daniel Dunbar49988882009-01-13 02:25:00 +0000474 // FIXME: Type coercion of void()* types.
Daniel Dunbar6bfed7e2008-08-01 00:01:51 +0000475 GlobalCtors.push_back(std::make_pair(Ctor, Priority));
Chris Lattner6d397602008-03-14 17:18:18 +0000476}
477
Daniel Dunbar6bfed7e2008-08-01 00:01:51 +0000478/// AddGlobalDtor - Add a function to the list that will be called
479/// when the module is unloaded.
480void CodeGenModule::AddGlobalDtor(llvm::Function * Dtor, int Priority) {
Daniel Dunbar49988882009-01-13 02:25:00 +0000481 // FIXME: Type coercion of void()* types.
Daniel Dunbar6bfed7e2008-08-01 00:01:51 +0000482 GlobalDtors.push_back(std::make_pair(Dtor, Priority));
483}
484
485void CodeGenModule::EmitCtorList(const CtorList &Fns, const char *GlobalName) {
486 // Ctor function type is void()*.
John McCall0774cb82011-05-15 01:53:33 +0000487 llvm::FunctionType* CtorFTy = llvm::FunctionType::get(VoidTy, false);
Owen Anderson96e0fc72009-07-29 22:16:19 +0000488 llvm::Type *CtorPFTy = llvm::PointerType::getUnqual(CtorFTy);
Daniel Dunbar6bfed7e2008-08-01 00:01:51 +0000489
490 // Get the type of a ctor entry, { i32, void ()* }.
Chris Lattnerc5cbb902011-06-20 04:01:35 +0000491 llvm::StructType *CtorStructTy =
Chris Lattner8b418682012-02-07 00:39:47 +0000492 llvm::StructType::get(Int32Ty, llvm::PointerType::getUnqual(CtorFTy), NULL);
Chris Lattner6d397602008-03-14 17:18:18 +0000493
Daniel Dunbar6bfed7e2008-08-01 00:01:51 +0000494 // Construct the constructor and destructor arrays.
Chris Lattner0b239712012-02-06 22:16:34 +0000495 SmallVector<llvm::Constant*, 8> Ctors;
Daniel Dunbar6bfed7e2008-08-01 00:01:51 +0000496 for (CtorList::const_iterator I = Fns.begin(), E = Fns.end(); I != E; ++I) {
Chris Lattner0b239712012-02-06 22:16:34 +0000497 llvm::Constant *S[] = {
498 llvm::ConstantInt::get(Int32Ty, I->second, false),
499 llvm::ConstantExpr::getBitCast(I->first, CtorPFTy)
500 };
Owen Anderson08e25242009-07-27 22:29:56 +0000501 Ctors.push_back(llvm::ConstantStruct::get(CtorStructTy, S));
Chris Lattner6d397602008-03-14 17:18:18 +0000502 }
Daniel Dunbar6bfed7e2008-08-01 00:01:51 +0000503
504 if (!Ctors.empty()) {
Owen Anderson96e0fc72009-07-29 22:16:19 +0000505 llvm::ArrayType *AT = llvm::ArrayType::get(CtorStructTy, Ctors.size());
Owen Anderson1c431b32009-07-08 19:05:04 +0000506 new llvm::GlobalVariable(TheModule, AT, false,
Daniel Dunbar6bfed7e2008-08-01 00:01:51 +0000507 llvm::GlobalValue::AppendingLinkage,
Owen Anderson7db6d832009-07-28 18:33:04 +0000508 llvm::ConstantArray::get(AT, Ctors),
Owen Anderson1c431b32009-07-08 19:05:04 +0000509 GlobalName);
Daniel Dunbar6bfed7e2008-08-01 00:01:51 +0000510 }
Chris Lattner6d397602008-03-14 17:18:18 +0000511}
512
John McCalld46f9852010-02-19 01:32:20 +0000513llvm::GlobalValue::LinkageTypes
Peter Collingbourne144a31f2013-06-05 17:49:37 +0000514CodeGenModule::getFunctionLinkage(GlobalDecl GD) {
Eli Friedman7a36a592013-07-01 20:53:07 +0000515 const FunctionDecl *D = cast<FunctionDecl>(GD.getDecl());
Argyrios Kyrtzidis90e99a82010-07-29 18:15:58 +0000516 GVALinkage Linkage = getContext().GetGVALinkageForFunction(D);
Daniel Dunbar7c65e992009-04-14 08:05:55 +0000517
Chris Lattnerf81530652010-06-30 16:58:07 +0000518 if (Linkage == GVA_Internal)
John McCalld46f9852010-02-19 01:32:20 +0000519 return llvm::Function::InternalLinkage;
Chris Lattnerf81530652010-06-30 16:58:07 +0000520
521 if (D->hasAttr<DLLExportAttr>())
John McCalld46f9852010-02-19 01:32:20 +0000522 return llvm::Function::DLLExportLinkage;
Chris Lattnerf81530652010-06-30 16:58:07 +0000523
524 if (D->hasAttr<WeakAttr>())
John McCalld46f9852010-02-19 01:32:20 +0000525 return llvm::Function::WeakAnyLinkage;
Chris Lattnerf81530652010-06-30 16:58:07 +0000526
527 // In C99 mode, 'inline' functions are guaranteed to have a strong
528 // definition somewhere else, so we can use available_externally linkage.
529 if (Linkage == GVA_C99Inline)
Fariborz Jahanianfd0f89d2011-02-04 00:08:13 +0000530 return llvm::Function::AvailableExternallyLinkage;
John McCall5584d912011-09-19 18:05:26 +0000531
532 // Note that Apple's kernel linker doesn't support symbol
533 // coalescing, so we need to avoid linkonce and weak linkages there.
534 // Normally, this means we just map to internal, but for explicit
535 // instantiations we'll map to external.
536
Chris Lattnerf81530652010-06-30 16:58:07 +0000537 // In C++, the compiler has to emit a definition in every translation unit
538 // that references the function. We should use linkonce_odr because
539 // a) if all references in this translation unit are optimized away, we
540 // don't need to codegen it. b) if the function persists, it needs to be
541 // merged with other definitions. c) C++ has the ODR, so we know the
542 // definition is dependable.
543 if (Linkage == GVA_CXXInline || Linkage == GVA_TemplateInstantiation)
David Blaikie4e4d0842012-03-11 07:00:24 +0000544 return !Context.getLangOpts().AppleKext
Fariborz Jahanian142f9e92011-02-04 00:01:24 +0000545 ? llvm::Function::LinkOnceODRLinkage
546 : llvm::Function::InternalLinkage;
Chris Lattnerf81530652010-06-30 16:58:07 +0000547
548 // An explicit instantiation of a template has weak linkage, since
549 // explicit instantiations can occur in multiple translation units
550 // and must all be equivalent. However, we are not allowed to
551 // throw away these explicit instantiations.
552 if (Linkage == GVA_ExplicitTemplateInstantiation)
David Blaikie4e4d0842012-03-11 07:00:24 +0000553 return !Context.getLangOpts().AppleKext
Fariborz Jahanian142f9e92011-02-04 00:01:24 +0000554 ? llvm::Function::WeakODRLinkage
John McCall5584d912011-09-19 18:05:26 +0000555 : llvm::Function::ExternalLinkage;
Chris Lattnerf81530652010-06-30 16:58:07 +0000556
557 // Otherwise, we have strong external linkage.
558 assert(Linkage == GVA_StrongExternal);
559 return llvm::Function::ExternalLinkage;
John McCalld46f9852010-02-19 01:32:20 +0000560}
Nuno Lopesd4cbda62008-06-08 15:45:52 +0000561
John McCalld46f9852010-02-19 01:32:20 +0000562
563/// SetFunctionDefinitionAttributes - Set attributes for a global.
564///
565/// FIXME: This is currently only done for aliases and functions, but not for
566/// variables (these details are set in EmitGlobalVarDefinition for variables).
567void CodeGenModule::SetFunctionDefinitionAttributes(const FunctionDecl *D,
568 llvm::GlobalValue *GV) {
Daniel Dunbar7c65e992009-04-14 08:05:55 +0000569 SetCommonAttributes(D, GV);
Nuno Lopesd4cbda62008-06-08 15:45:52 +0000570}
571
Daniel Dunbar7dbd8192009-04-14 07:08:30 +0000572void CodeGenModule::SetLLVMFunctionAttributes(const Decl *D,
Mike Stump1eb44332009-09-09 15:08:12 +0000573 const CGFunctionInfo &Info,
Daniel Dunbar7dbd8192009-04-14 07:08:30 +0000574 llvm::Function *F) {
Daniel Dunbarca6408c2009-09-12 00:59:20 +0000575 unsigned CallingConv;
Devang Patel761d7f72008-09-25 21:02:23 +0000576 AttributeListType AttributeList;
Bill Wendling94236e72013-02-22 00:13:35 +0000577 ConstructAttributeList(Info, D, AttributeList, CallingConv, false);
Bill Wendling785b7782012-12-07 23:17:26 +0000578 F->setAttributes(llvm::AttributeSet::get(getLLVMContext(), AttributeList));
Daniel Dunbarca6408c2009-09-12 00:59:20 +0000579 F->setCallingConv(static_cast<llvm::CallingConv::ID>(CallingConv));
Daniel Dunbarf80519b2008-09-04 23:41:35 +0000580}
581
John McCalld1e40d52011-10-02 01:16:38 +0000582/// Determines whether the language options require us to model
583/// unwind exceptions. We treat -fexceptions as mandating this
584/// except under the fragile ObjC ABI with only ObjC exceptions
585/// enabled. This means, for example, that C with -fexceptions
586/// enables this.
David Blaikie4e4d0842012-03-11 07:00:24 +0000587static bool hasUnwindExceptions(const LangOptions &LangOpts) {
John McCalld1e40d52011-10-02 01:16:38 +0000588 // If exceptions are completely disabled, obviously this is false.
David Blaikie4e4d0842012-03-11 07:00:24 +0000589 if (!LangOpts.Exceptions) return false;
John McCalld1e40d52011-10-02 01:16:38 +0000590
591 // If C++ exceptions are enabled, this is true.
David Blaikie4e4d0842012-03-11 07:00:24 +0000592 if (LangOpts.CXXExceptions) return true;
John McCalld1e40d52011-10-02 01:16:38 +0000593
594 // If ObjC exceptions are enabled, this depends on the ABI.
David Blaikie4e4d0842012-03-11 07:00:24 +0000595 if (LangOpts.ObjCExceptions) {
David Chisnall11d3f4c2012-07-03 20:49:52 +0000596 return LangOpts.ObjCRuntime.hasUnwindExceptions();
John McCalld1e40d52011-10-02 01:16:38 +0000597 }
598
599 return true;
600}
601
Daniel Dunbar7c65e992009-04-14 08:05:55 +0000602void CodeGenModule::SetLLVMFunctionAttributesForDefinition(const Decl *D,
603 llvm::Function *F) {
Benjamin Kramer06a9d042013-05-11 12:45:37 +0000604 llvm::AttrBuilder B;
605
Rafael Espindolaabca5a12011-05-25 03:44:55 +0000606 if (CodeGenOpts.UnwindTables)
Benjamin Kramer06a9d042013-05-11 12:45:37 +0000607 B.addAttribute(llvm::Attribute::UWTable);
Rafael Espindolaabca5a12011-05-25 03:44:55 +0000608
David Blaikie4e4d0842012-03-11 07:00:24 +0000609 if (!hasUnwindExceptions(LangOpts))
Benjamin Kramer06a9d042013-05-11 12:45:37 +0000610 B.addAttribute(llvm::Attribute::NoUnwind);
Daniel Dunbaraf668b02008-10-28 00:17:57 +0000611
Eli Friedman2873aee2011-08-22 23:55:33 +0000612 if (D->hasAttr<NakedAttr>()) {
613 // Naked implies noinline: we should not be inlining such functions.
Benjamin Kramer06a9d042013-05-11 12:45:37 +0000614 B.addAttribute(llvm::Attribute::Naked);
615 B.addAttribute(llvm::Attribute::NoInline);
616 } else if (D->hasAttr<NoInlineAttr>()) {
617 B.addAttribute(llvm::Attribute::NoInline);
618 } else if ((D->hasAttr<AlwaysInlineAttr>() ||
619 D->hasAttr<ForceInlineAttr>()) &&
620 !F->getAttributes().hasAttribute(llvm::AttributeSet::FunctionIndex,
621 llvm::Attribute::NoInline)) {
622 // (noinline wins over always_inline, and we can't specify both in IR)
623 B.addAttribute(llvm::Attribute::AlwaysInline);
Eli Friedman2873aee2011-08-22 23:55:33 +0000624 }
Daniel Dunbardd0cb222010-09-29 18:20:25 +0000625
Diego Novillod27e5cb2013-05-24 20:18:15 +0000626 if (D->hasAttr<ColdAttr>()) {
Benjamin Kramer06a9d042013-05-11 12:45:37 +0000627 B.addAttribute(llvm::Attribute::OptimizeForSize);
Diego Novillod27e5cb2013-05-24 20:18:15 +0000628 B.addAttribute(llvm::Attribute::Cold);
629 }
Benjamin Krameree409a92012-05-12 21:10:52 +0000630
Quentin Colombetaee56fa2012-11-01 23:55:47 +0000631 if (D->hasAttr<MinSizeAttr>())
Benjamin Kramer06a9d042013-05-11 12:45:37 +0000632 B.addAttribute(llvm::Attribute::MinSize);
Richard Smithef4d5ce2012-09-28 22:46:07 +0000633
David Blaikie4e4d0842012-03-11 07:00:24 +0000634 if (LangOpts.getStackProtector() == LangOptions::SSPOn)
Benjamin Kramer06a9d042013-05-11 12:45:37 +0000635 B.addAttribute(llvm::Attribute::StackProtect);
David Blaikie4e4d0842012-03-11 07:00:24 +0000636 else if (LangOpts.getStackProtector() == LangOptions::SSPReq)
Benjamin Kramer06a9d042013-05-11 12:45:37 +0000637 B.addAttribute(llvm::Attribute::StackProtectReq);
Will Dietz4f45bc02013-01-18 11:30:38 +0000638
Alexey Samsonov7e73f942013-03-06 10:54:18 +0000639 // Add sanitizer attributes if function is not blacklisted.
640 if (!SanitizerBlacklist.isIn(*F)) {
641 // When AddressSanitizer is enabled, set SanitizeAddress attribute
642 // unless __attribute__((no_sanitize_address)) is used.
643 if (SanOpts.Address && !D->hasAttr<NoSanitizeAddressAttr>())
Benjamin Kramer06a9d042013-05-11 12:45:37 +0000644 B.addAttribute(llvm::Attribute::SanitizeAddress);
Alexey Samsonov7e73f942013-03-06 10:54:18 +0000645 // Same for ThreadSanitizer and __attribute__((no_sanitize_thread))
646 if (SanOpts.Thread && !D->hasAttr<NoSanitizeThreadAttr>()) {
Benjamin Kramer06a9d042013-05-11 12:45:37 +0000647 B.addAttribute(llvm::Attribute::SanitizeThread);
Alexey Samsonov7e73f942013-03-06 10:54:18 +0000648 }
649 // Same for MemorySanitizer and __attribute__((no_sanitize_memory))
650 if (SanOpts.Memory && !D->hasAttr<NoSanitizeMemoryAttr>())
Benjamin Kramer06a9d042013-05-11 12:45:37 +0000651 B.addAttribute(llvm::Attribute::SanitizeMemory);
Alexey Samsonov7e73f942013-03-06 10:54:18 +0000652 }
Alexander Potapenko89651ea2012-02-02 11:49:28 +0000653
Benjamin Kramer06a9d042013-05-11 12:45:37 +0000654 F->addAttributes(llvm::AttributeSet::FunctionIndex,
655 llvm::AttributeSet::get(
656 F->getContext(), llvm::AttributeSet::FunctionIndex, B));
657
658 if (isa<CXXConstructorDecl>(D) || isa<CXXDestructorDecl>(D))
659 F->setUnnamedAddr(true);
660 else if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D))
661 if (MD->isVirtual())
662 F->setUnnamedAddr(true);
663
Sean Huntcf807c42010-08-18 23:23:40 +0000664 unsigned alignment = D->getMaxAlignment() / Context.getCharWidth();
665 if (alignment)
666 F->setAlignment(alignment);
667
Mike Stumpfb51ddf2009-10-05 22:49:20 +0000668 // C++ ABI requires 2-byte alignment for member functions.
Mike Stumpbd6dbd12009-10-05 23:08:21 +0000669 if (F->getAlignment() < 2 && isa<CXXMethodDecl>(D))
670 F->setAlignment(2);
Daniel Dunbarf80519b2008-09-04 23:41:35 +0000671}
672
Mike Stump1eb44332009-09-09 15:08:12 +0000673void CodeGenModule::SetCommonAttributes(const Decl *D,
Daniel Dunbar7c65e992009-04-14 08:05:55 +0000674 llvm::GlobalValue *GV) {
Anders Carlsson934176f2011-01-29 19:41:00 +0000675 if (const NamedDecl *ND = dyn_cast<NamedDecl>(D))
676 setGlobalVisibility(GV, ND);
John McCall1fb0caa2010-10-22 21:05:15 +0000677 else
678 GV->setVisibility(llvm::GlobalValue::DefaultVisibility);
Daniel Dunbar7c65e992009-04-14 08:05:55 +0000679
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +0000680 if (D->hasAttr<UsedAttr>())
Daniel Dunbar7c65e992009-04-14 08:05:55 +0000681 AddUsedGlobal(GV);
682
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +0000683 if (const SectionAttr *SA = D->getAttr<SectionAttr>())
Daniel Dunbar7c65e992009-04-14 08:05:55 +0000684 GV->setSection(SA->getName());
Anton Korobeynikov82d0a412010-01-10 12:58:08 +0000685
Rafael Espindola9a2f5d72013-03-19 15:03:47 +0000686 // Alias cannot have attributes. Filter them here.
687 if (!isa<llvm::GlobalAlias>(GV))
688 getTargetCodeGenInfo().SetTargetAttributes(D, GV, *this);
Daniel Dunbar7c65e992009-04-14 08:05:55 +0000689}
690
Daniel Dunbar0e4f40e2009-04-17 00:48:04 +0000691void CodeGenModule::SetInternalFunctionAttributes(const Decl *D,
692 llvm::Function *F,
693 const CGFunctionInfo &FI) {
694 SetLLVMFunctionAttributes(D, FI, F);
695 SetLLVMFunctionAttributesForDefinition(D, F);
Daniel Dunbar7c65e992009-04-14 08:05:55 +0000696
697 F->setLinkage(llvm::Function::InternalLinkage);
698
Daniel Dunbar0e4f40e2009-04-17 00:48:04 +0000699 SetCommonAttributes(D, F);
Daniel Dunbarf80519b2008-09-04 23:41:35 +0000700}
701
Anders Carlssonb2bcf1c2010-02-06 02:44:09 +0000702void CodeGenModule::SetFunctionAttributes(GlobalDecl GD,
Eli Friedmanc6c14d12009-05-26 01:22:57 +0000703 llvm::Function *F,
704 bool IsIncompleteFunction) {
Peter Collingbourne0ac2cf42011-04-06 12:29:04 +0000705 if (unsigned IID = F->getIntrinsicID()) {
706 // If this is an intrinsic function, set the function's attributes
707 // to the intrinsic's attributes.
Bill Wendling50e6b182012-10-15 04:47:45 +0000708 F->setAttributes(llvm::Intrinsic::getAttributes(getLLVMContext(),
709 (llvm::Intrinsic::ID)IID));
Peter Collingbourne0ac2cf42011-04-06 12:29:04 +0000710 return;
711 }
712
Anders Carlssonb2bcf1c2010-02-06 02:44:09 +0000713 const FunctionDecl *FD = cast<FunctionDecl>(GD.getDecl());
714
Eli Friedmanc6c14d12009-05-26 01:22:57 +0000715 if (!IsIncompleteFunction)
John McCallde5d3c72012-02-17 03:33:10 +0000716 SetLLVMFunctionAttributes(FD, getTypes().arrangeGlobalDeclaration(GD), F);
Mike Stump1eb44332009-09-09 15:08:12 +0000717
Stephen Lin3b50e8d2013-06-30 20:40:16 +0000718 if (getCXXABI().HasThisReturn(GD)) {
719 assert(!F->arg_empty() &&
720 F->arg_begin()->getType()
721 ->canLosslesslyBitCastTo(F->getReturnType()) &&
722 "unexpected this return");
723 F->addAttribute(1, llvm::Attribute::Returned);
724 }
725
Daniel Dunbar7c65e992009-04-14 08:05:55 +0000726 // Only a few attributes are set on declarations; these may later be
727 // overridden by a definition.
Mike Stump1eb44332009-09-09 15:08:12 +0000728
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +0000729 if (FD->hasAttr<DLLImportAttr>()) {
Daniel Dunbar7c65e992009-04-14 08:05:55 +0000730 F->setLinkage(llvm::Function::DLLImportLinkage);
Mike Stump1eb44332009-09-09 15:08:12 +0000731 } else if (FD->hasAttr<WeakAttr>() ||
Douglas Gregor0a0d2b12011-03-23 00:50:03 +0000732 FD->isWeakImported()) {
Daniel Dunbar7c65e992009-04-14 08:05:55 +0000733 // "extern_weak" is overloaded in LLVM; we probably should have
Mike Stump1eb44332009-09-09 15:08:12 +0000734 // separate linkage types for this.
Daniel Dunbar7c65e992009-04-14 08:05:55 +0000735 F->setLinkage(llvm::Function::ExternalWeakLinkage);
736 } else {
Mike Stump1eb44332009-09-09 15:08:12 +0000737 F->setLinkage(llvm::Function::ExternalLinkage);
John McCallaf146032010-10-30 11:50:40 +0000738
Rafael Espindola2beda122013-02-27 02:15:29 +0000739 LinkageInfo LV = FD->getLinkageAndVisibility();
Rafael Espindolaf127eb82013-02-27 02:56:45 +0000740 if (LV.getLinkage() == ExternalLinkage && LV.isVisibilityExplicit()) {
741 F->setVisibility(GetLLVMVisibility(LV.getVisibility()));
John McCallaf146032010-10-30 11:50:40 +0000742 }
Daniel Dunbar7c65e992009-04-14 08:05:55 +0000743 }
744
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +0000745 if (const SectionAttr *SA = FD->getAttr<SectionAttr>())
Daniel Dunbar7c65e992009-04-14 08:05:55 +0000746 F->setSection(SA->getName());
Richard Smithddcff1b2013-07-21 23:12:18 +0000747
748 // A replaceable global allocation function does not act like a builtin by
749 // default, only if it is invoked by a new-expression or delete-expression.
750 if (FD->isReplaceableGlobalAllocationFunction())
751 F->addAttribute(llvm::AttributeSet::FunctionIndex,
752 llvm::Attribute::NoBuiltin);
Daniel Dunbar219df662008-09-08 23:44:31 +0000753}
754
Daniel Dunbar02698712009-02-13 20:29:50 +0000755void CodeGenModule::AddUsedGlobal(llvm::GlobalValue *GV) {
Mike Stump1eb44332009-09-09 15:08:12 +0000756 assert(!GV->isDeclaration() &&
Daniel Dunbar02698712009-02-13 20:29:50 +0000757 "Only globals with definition can force usage.");
Chris Lattner35f38a22009-03-31 22:37:52 +0000758 LLVMUsed.push_back(GV);
Daniel Dunbar02698712009-02-13 20:29:50 +0000759}
760
761void CodeGenModule::EmitLLVMUsed() {
762 // Don't create llvm.used if there is no need.
Chris Lattnerad64e022009-07-17 23:57:13 +0000763 if (LLVMUsed.empty())
Daniel Dunbar02698712009-02-13 20:29:50 +0000764 return;
765
Chris Lattner35f38a22009-03-31 22:37:52 +0000766 // Convert LLVMUsed to what ConstantArray needs.
Chris Lattner0b239712012-02-06 22:16:34 +0000767 SmallVector<llvm::Constant*, 8> UsedArray;
Chris Lattner35f38a22009-03-31 22:37:52 +0000768 UsedArray.resize(LLVMUsed.size());
769 for (unsigned i = 0, e = LLVMUsed.size(); i != e; ++i) {
Mike Stump1eb44332009-09-09 15:08:12 +0000770 UsedArray[i] =
771 llvm::ConstantExpr::getBitCast(cast<llvm::Constant>(&*LLVMUsed[i]),
Chris Lattner0b239712012-02-06 22:16:34 +0000772 Int8PtrTy);
Chris Lattner35f38a22009-03-31 22:37:52 +0000773 }
Mike Stump1eb44332009-09-09 15:08:12 +0000774
Fariborz Jahanianc38e9af2009-06-23 21:47:46 +0000775 if (UsedArray.empty())
776 return;
Chris Lattner0b239712012-02-06 22:16:34 +0000777 llvm::ArrayType *ATy = llvm::ArrayType::get(Int8PtrTy, UsedArray.size());
Mike Stump1eb44332009-09-09 15:08:12 +0000778
779 llvm::GlobalVariable *GV =
780 new llvm::GlobalVariable(getModule(), ATy, false,
Daniel Dunbar02698712009-02-13 20:29:50 +0000781 llvm::GlobalValue::AppendingLinkage,
Owen Anderson7db6d832009-07-28 18:33:04 +0000782 llvm::ConstantArray::get(ATy, UsedArray),
Owen Anderson1c431b32009-07-08 19:05:04 +0000783 "llvm.used");
Daniel Dunbar02698712009-02-13 20:29:50 +0000784
785 GV->setSection("llvm.metadata");
786}
787
Reid Kleckner3190ca92013-05-08 13:44:39 +0000788void CodeGenModule::AppendLinkerOptions(StringRef Opts) {
789 llvm::Value *MDOpts = llvm::MDString::get(getLLVMContext(), Opts);
790 LinkerOptionsMetadata.push_back(llvm::MDNode::get(getLLVMContext(), MDOpts));
791}
792
Aaron Ballmana7ff62f2013-06-04 02:07:14 +0000793void CodeGenModule::AddDetectMismatch(StringRef Name, StringRef Value) {
794 llvm::SmallString<32> Opt;
795 getTargetCodeGenInfo().getDetectMismatchOption(Name, Value, Opt);
796 llvm::Value *MDOpts = llvm::MDString::get(getLLVMContext(), Opt);
797 LinkerOptionsMetadata.push_back(llvm::MDNode::get(getLLVMContext(), MDOpts));
798}
799
Reid Kleckner3190ca92013-05-08 13:44:39 +0000800void CodeGenModule::AddDependentLib(StringRef Lib) {
801 llvm::SmallString<24> Opt;
802 getTargetCodeGenInfo().getDependentLibraryOption(Lib, Opt);
803 llvm::Value *MDOpts = llvm::MDString::get(getLLVMContext(), Opt);
804 LinkerOptionsMetadata.push_back(llvm::MDNode::get(getLLVMContext(), MDOpts));
805}
806
Douglas Gregor858afb32013-01-14 20:53:57 +0000807/// \brief Add link options implied by the given module, including modules
808/// it depends on, using a postorder walk.
Reid Kleckner3190ca92013-05-08 13:44:39 +0000809static void addLinkOptionsPostorder(CodeGenModule &CGM,
Douglas Gregor858afb32013-01-14 20:53:57 +0000810 Module *Mod,
Daniel Dunbarf9d03c12013-01-17 01:35:06 +0000811 SmallVectorImpl<llvm::Value *> &Metadata,
Douglas Gregor858afb32013-01-14 20:53:57 +0000812 llvm::SmallPtrSet<Module *, 16> &Visited) {
813 // Import this module's parent.
814 if (Mod->Parent && Visited.insert(Mod->Parent)) {
Reid Kleckner3190ca92013-05-08 13:44:39 +0000815 addLinkOptionsPostorder(CGM, Mod->Parent, Metadata, Visited);
Douglas Gregor858afb32013-01-14 20:53:57 +0000816 }
817
818 // Import this module's dependencies.
819 for (unsigned I = Mod->Imports.size(); I > 0; --I) {
820 if (Visited.insert(Mod->Imports[I-1]))
Reid Kleckner3190ca92013-05-08 13:44:39 +0000821 addLinkOptionsPostorder(CGM, Mod->Imports[I-1], Metadata, Visited);
Douglas Gregor858afb32013-01-14 20:53:57 +0000822 }
823
824 // Add linker options to link against the libraries/frameworks
825 // described by this module.
Reid Kleckner3190ca92013-05-08 13:44:39 +0000826 llvm::LLVMContext &Context = CGM.getLLVMContext();
Douglas Gregor858afb32013-01-14 20:53:57 +0000827 for (unsigned I = Mod->LinkLibraries.size(); I > 0; --I) {
Reid Kleckner3190ca92013-05-08 13:44:39 +0000828 // Link against a framework. Frameworks are currently Darwin only, so we
829 // don't to ask TargetCodeGenInfo for the spelling of the linker option.
Douglas Gregor858afb32013-01-14 20:53:57 +0000830 if (Mod->LinkLibraries[I-1].IsFramework) {
831 llvm::Value *Args[2] = {
832 llvm::MDString::get(Context, "-framework"),
833 llvm::MDString::get(Context, Mod->LinkLibraries[I-1].Library)
834 };
835
836 Metadata.push_back(llvm::MDNode::get(Context, Args));
837 continue;
838 }
839
840 // Link against a library.
Reid Kleckner3190ca92013-05-08 13:44:39 +0000841 llvm::SmallString<24> Opt;
842 CGM.getTargetCodeGenInfo().getDependentLibraryOption(
843 Mod->LinkLibraries[I-1].Library, Opt);
844 llvm::Value *OptString = llvm::MDString::get(Context, Opt);
Douglas Gregor858afb32013-01-14 20:53:57 +0000845 Metadata.push_back(llvm::MDNode::get(Context, OptString));
846 }
847}
848
849void CodeGenModule::EmitModuleLinkOptions() {
850 // Collect the set of all of the modules we want to visit to emit link
851 // options, which is essentially the imported modules and all of their
852 // non-explicit child modules.
853 llvm::SetVector<clang::Module *> LinkModules;
854 llvm::SmallPtrSet<clang::Module *, 16> Visited;
855 SmallVector<clang::Module *, 16> Stack;
856
857 // Seed the stack with imported modules.
858 for (llvm::SetVector<clang::Module *>::iterator M = ImportedModules.begin(),
859 MEnd = ImportedModules.end();
860 M != MEnd; ++M) {
861 if (Visited.insert(*M))
862 Stack.push_back(*M);
863 }
864
865 // Find all of the modules to import, making a little effort to prune
866 // non-leaf modules.
867 while (!Stack.empty()) {
868 clang::Module *Mod = Stack.back();
869 Stack.pop_back();
870
871 bool AnyChildren = false;
872
873 // Visit the submodules of this module.
874 for (clang::Module::submodule_iterator Sub = Mod->submodule_begin(),
875 SubEnd = Mod->submodule_end();
876 Sub != SubEnd; ++Sub) {
877 // Skip explicit children; they need to be explicitly imported to be
878 // linked against.
879 if ((*Sub)->IsExplicit)
880 continue;
881
882 if (Visited.insert(*Sub)) {
883 Stack.push_back(*Sub);
884 AnyChildren = true;
885 }
886 }
887
888 // We didn't find any children, so add this module to the list of
889 // modules to link against.
890 if (!AnyChildren) {
891 LinkModules.insert(Mod);
892 }
893 }
894
895 // Add link options for all of the imported modules in reverse topological
Reid Kleckner3190ca92013-05-08 13:44:39 +0000896 // order. We don't do anything to try to order import link flags with respect
897 // to linker options inserted by things like #pragma comment().
Daniel Dunbarf9d03c12013-01-17 01:35:06 +0000898 SmallVector<llvm::Value *, 16> MetadataArgs;
Douglas Gregor858afb32013-01-14 20:53:57 +0000899 Visited.clear();
900 for (llvm::SetVector<clang::Module *>::iterator M = LinkModules.begin(),
901 MEnd = LinkModules.end();
902 M != MEnd; ++M) {
903 if (Visited.insert(*M))
Reid Kleckner3190ca92013-05-08 13:44:39 +0000904 addLinkOptionsPostorder(*this, *M, MetadataArgs, Visited);
Douglas Gregor858afb32013-01-14 20:53:57 +0000905 }
Daniel Dunbarf9d03c12013-01-17 01:35:06 +0000906 std::reverse(MetadataArgs.begin(), MetadataArgs.end());
Reid Kleckner3190ca92013-05-08 13:44:39 +0000907 LinkerOptionsMetadata.append(MetadataArgs.begin(), MetadataArgs.end());
Douglas Gregor858afb32013-01-14 20:53:57 +0000908
Daniel Dunbarf9d03c12013-01-17 01:35:06 +0000909 // Add the linker options metadata flag.
910 getModule().addModuleFlag(llvm::Module::AppendUnique, "Linker Options",
Reid Kleckner3190ca92013-05-08 13:44:39 +0000911 llvm::MDNode::get(getLLVMContext(),
912 LinkerOptionsMetadata));
Douglas Gregor858afb32013-01-14 20:53:57 +0000913}
914
Daniel Dunbar02698712009-02-13 20:29:50 +0000915void CodeGenModule::EmitDeferred() {
Chris Lattner67b00522009-03-21 09:44:56 +0000916 // Emit code for any potentially referenced deferred decls. Since a
917 // previously unused static decl may become used during the generation of code
Nick Lewyckydce67a72011-07-18 05:26:13 +0000918 // for a static function, iterate until no changes are made.
Rafael Espindolabbf58bb2010-03-10 02:19:29 +0000919
John McCalld5617ee2013-01-25 22:31:03 +0000920 while (true) {
Anders Carlsson046c2942010-04-17 20:15:18 +0000921 if (!DeferredVTables.empty()) {
John McCalld5617ee2013-01-25 22:31:03 +0000922 EmitDeferredVTables();
923
924 // Emitting a v-table doesn't directly cause more v-tables to
925 // become deferred, although it can cause functions to be
926 // emitted that then need those v-tables.
927 assert(DeferredVTables.empty());
Rafael Espindolabbf58bb2010-03-10 02:19:29 +0000928 }
929
John McCalld5617ee2013-01-25 22:31:03 +0000930 // Stop if we're out of both deferred v-tables and deferred declarations.
931 if (DeferredDeclsToEmit.empty()) break;
932
Anders Carlsson2a131fb2009-05-05 04:44:02 +0000933 GlobalDecl D = DeferredDeclsToEmit.back();
Chris Lattner67b00522009-03-21 09:44:56 +0000934 DeferredDeclsToEmit.pop_back();
935
John McCallc76702c2010-05-27 01:45:30 +0000936 // Check to see if we've already emitted this. This is necessary
937 // for a couple of reasons: first, decls can end up in the
938 // deferred-decls queue multiple times, and second, decls can end
939 // up with definitions in unusual ways (e.g. by an extern inline
940 // function acquiring a strong function redefinition). Just
941 // ignore these cases.
942 //
943 // TODO: That said, looking this up multiple times is very wasteful.
Chris Lattner5f9e2722011-07-23 10:55:15 +0000944 StringRef Name = getMangledName(D);
John McCallf746aa62010-03-19 23:29:14 +0000945 llvm::GlobalValue *CGRef = GetGlobalValue(Name);
Chris Lattner67b00522009-03-21 09:44:56 +0000946 assert(CGRef && "Deferred decl wasn't referenced?");
Mike Stump1eb44332009-09-09 15:08:12 +0000947
Chris Lattner67b00522009-03-21 09:44:56 +0000948 if (!CGRef->isDeclaration())
949 continue;
Mike Stump1eb44332009-09-09 15:08:12 +0000950
John McCallc76702c2010-05-27 01:45:30 +0000951 // GlobalAlias::isDeclaration() defers to the aliasee, but for our
952 // purposes an alias counts as a definition.
953 if (isa<llvm::GlobalAlias>(CGRef))
954 continue;
955
Chris Lattner67b00522009-03-21 09:44:56 +0000956 // Otherwise, emit the definition and move on to the next one.
957 EmitGlobalDefinition(D);
958 }
Reid Spencer5f016e22007-07-11 17:01:13 +0000959}
960
Julien Lerouge77f68bb2011-09-09 22:41:49 +0000961void CodeGenModule::EmitGlobalAnnotations() {
962 if (Annotations.empty())
963 return;
964
965 // Create a new global variable for the ConstantStruct in the Module.
966 llvm::Constant *Array = llvm::ConstantArray::get(llvm::ArrayType::get(
967 Annotations[0]->getType(), Annotations.size()), Annotations);
968 llvm::GlobalValue *gv = new llvm::GlobalVariable(getModule(),
969 Array->getType(), false, llvm::GlobalValue::AppendingLinkage, Array,
970 "llvm.global.annotations");
971 gv->setSection(AnnotationSection);
972}
973
Dmitri Gribenkocfa88f82013-01-12 19:30:44 +0000974llvm::Constant *CodeGenModule::EmitAnnotationString(StringRef Str) {
Julien Lerouge77f68bb2011-09-09 22:41:49 +0000975 llvm::StringMap<llvm::Constant*>::iterator i = AnnotationStrings.find(Str);
976 if (i != AnnotationStrings.end())
977 return i->second;
978
979 // Not found yet, create a new global.
Chris Lattner94010692012-02-05 02:30:40 +0000980 llvm::Constant *s = llvm::ConstantDataArray::getString(getLLVMContext(), Str);
Julien Lerouge77f68bb2011-09-09 22:41:49 +0000981 llvm::GlobalValue *gv = new llvm::GlobalVariable(getModule(), s->getType(),
982 true, llvm::GlobalValue::PrivateLinkage, s, ".str");
983 gv->setSection(AnnotationSection);
984 gv->setUnnamedAddr(true);
985 AnnotationStrings[Str] = gv;
986 return gv;
987}
988
989llvm::Constant *CodeGenModule::EmitAnnotationUnit(SourceLocation Loc) {
990 SourceManager &SM = getContext().getSourceManager();
991 PresumedLoc PLoc = SM.getPresumedLoc(Loc);
992 if (PLoc.isValid())
993 return EmitAnnotationString(PLoc.getFilename());
994 return EmitAnnotationString(SM.getBufferName(Loc));
995}
996
997llvm::Constant *CodeGenModule::EmitAnnotationLineNo(SourceLocation L) {
998 SourceManager &SM = getContext().getSourceManager();
999 PresumedLoc PLoc = SM.getPresumedLoc(L);
1000 unsigned LineNo = PLoc.isValid() ? PLoc.getLine() :
1001 SM.getExpansionLineNumber(L);
1002 return llvm::ConstantInt::get(Int32Ty, LineNo);
1003}
1004
Mike Stump1eb44332009-09-09 15:08:12 +00001005llvm::Constant *CodeGenModule::EmitAnnotateAttr(llvm::GlobalValue *GV,
Nate Begeman8bd4afe2008-04-19 04:17:09 +00001006 const AnnotateAttr *AA,
Julien Lerouge77f68bb2011-09-09 22:41:49 +00001007 SourceLocation L) {
1008 // Get the globals for file name, annotation, and the line number.
1009 llvm::Constant *AnnoGV = EmitAnnotationString(AA->getAnnotation()),
1010 *UnitGV = EmitAnnotationUnit(L),
1011 *LineNoCst = EmitAnnotationLineNo(L);
Nate Begeman8bd4afe2008-04-19 04:17:09 +00001012
Daniel Dunbar57d5cee2009-04-14 22:41:13 +00001013 // Create the ConstantStruct for the global annotation.
Nate Begeman8bd4afe2008-04-19 04:17:09 +00001014 llvm::Constant *Fields[4] = {
Julien Lerouge77f68bb2011-09-09 22:41:49 +00001015 llvm::ConstantExpr::getBitCast(GV, Int8PtrTy),
1016 llvm::ConstantExpr::getBitCast(AnnoGV, Int8PtrTy),
1017 llvm::ConstantExpr::getBitCast(UnitGV, Int8PtrTy),
1018 LineNoCst
Nate Begeman8bd4afe2008-04-19 04:17:09 +00001019 };
Chris Lattnerc5cbb902011-06-20 04:01:35 +00001020 return llvm::ConstantStruct::getAnon(Fields);
Nate Begeman8bd4afe2008-04-19 04:17:09 +00001021}
1022
Julien Lerouge77f68bb2011-09-09 22:41:49 +00001023void CodeGenModule::AddGlobalAnnotations(const ValueDecl *D,
1024 llvm::GlobalValue *GV) {
1025 assert(D->hasAttr<AnnotateAttr>() && "no annotate attribute");
1026 // Get the struct elements for these annotations.
1027 for (specific_attr_iterator<AnnotateAttr>
1028 ai = D->specific_attr_begin<AnnotateAttr>(),
1029 ae = D->specific_attr_end<AnnotateAttr>(); ai != ae; ++ai)
1030 Annotations.push_back(EmitAnnotateAttr(GV, *ai, D->getLocation()));
1031}
1032
Argyrios Kyrtzidisa6d6af32010-07-27 22:37:14 +00001033bool CodeGenModule::MayDeferGeneration(const ValueDecl *Global) {
Argyrios Kyrtzidis90e99a82010-07-29 18:15:58 +00001034 // Never defer when EmitAllDecls is specified.
David Blaikie4e4d0842012-03-11 07:00:24 +00001035 if (LangOpts.EmitAllDecls)
Daniel Dunbar73241df2009-02-13 21:18:01 +00001036 return false;
Daniel Dunbarbd012ff2008-07-29 23:18:29 +00001037
Argyrios Kyrtzidis4ac7c0b2010-07-29 20:08:05 +00001038 return !getContext().DeclMustBeEmitted(Global);
Daniel Dunbar73241df2009-02-13 21:18:01 +00001039}
1040
Nico Weberc5f80462012-10-11 10:13:44 +00001041llvm::Constant *CodeGenModule::GetAddrOfUuidDescriptor(
1042 const CXXUuidofExpr* E) {
1043 // Sema has verified that IIDSource has a __declspec(uuid()), and that its
1044 // well-formed.
1045 StringRef Uuid;
1046 if (E->isTypeOperand())
1047 Uuid = CXXUuidofExpr::GetUuidAttrOfType(E->getTypeOperand())->getGuid();
1048 else {
1049 // Special case: __uuidof(0) means an all-zero GUID.
1050 Expr *Op = E->getExprOperand();
1051 if (!Op->isNullPointerConstant(Context, Expr::NPC_ValueDependentIsNull))
1052 Uuid = CXXUuidofExpr::GetUuidAttrOfType(Op->getType())->getGuid();
1053 else
1054 Uuid = "00000000-0000-0000-0000-000000000000";
1055 }
1056 std::string Name = "__uuid_" + Uuid.str();
1057
1058 // Look for an existing global.
1059 if (llvm::GlobalVariable *GV = getModule().getNamedGlobal(Name))
1060 return GV;
1061
1062 llvm::Constant *Init = EmitUuidofInitializer(Uuid, E->getType());
1063 assert(Init && "failed to initialize as constant");
1064
1065 // GUIDs are assumed to be 16 bytes, spread over 4-2-2-8 bytes. However, the
1066 // first field is declared as "long", which for many targets is 8 bytes.
1067 // Those architectures are not supported. (With the MS abi, long is always 4
1068 // bytes.)
1069 llvm::Type *GuidType = getTypes().ConvertType(E->getType());
1070 if (Init->getType() != GuidType) {
1071 DiagnosticsEngine &Diags = getDiags();
1072 unsigned DiagID = Diags.getCustomDiagID(DiagnosticsEngine::Error,
1073 "__uuidof codegen is not supported on this architecture");
1074 Diags.Report(E->getExprLoc(), DiagID) << E->getSourceRange();
1075 Init = llvm::UndefValue::get(GuidType);
1076 }
1077
1078 llvm::GlobalVariable *GV = new llvm::GlobalVariable(getModule(), GuidType,
1079 /*isConstant=*/true, llvm::GlobalValue::PrivateLinkage, Init, Name);
1080 GV->setUnnamedAddr(true);
1081 return GV;
1082}
1083
Rafael Espindola6a836702010-03-04 18:17:24 +00001084llvm::Constant *CodeGenModule::GetWeakRefReference(const ValueDecl *VD) {
1085 const AliasAttr *AA = VD->getAttr<AliasAttr>();
1086 assert(AA && "No alias?");
1087
Chris Lattner2acc6e32011-07-18 04:24:23 +00001088 llvm::Type *DeclTy = getTypes().ConvertTypeForMem(VD->getType());
Rafael Espindola6a836702010-03-04 18:17:24 +00001089
Rafael Espindola6a836702010-03-04 18:17:24 +00001090 // See if there is already something with the target's name in the module.
John McCallf746aa62010-03-19 23:29:14 +00001091 llvm::GlobalValue *Entry = GetGlobalValue(AA->getAliasee());
Joerg Sonnenberger4695f912012-10-16 17:45:27 +00001092 if (Entry) {
1093 unsigned AS = getContext().getTargetAddressSpace(VD->getType());
1094 return llvm::ConstantExpr::getBitCast(Entry, DeclTy->getPointerTo(AS));
1095 }
Rafael Espindola6a836702010-03-04 18:17:24 +00001096
1097 llvm::Constant *Aliasee;
1098 if (isa<llvm::FunctionType>(DeclTy))
Alex Rosenbergc857ce82012-10-05 23:12:53 +00001099 Aliasee = GetOrCreateLLVMFunction(AA->getAliasee(), DeclTy,
1100 GlobalDecl(cast<FunctionDecl>(VD)),
Anders Carlsson1faa89f2011-02-05 04:35:53 +00001101 /*ForVTable=*/false);
Rafael Espindola6a836702010-03-04 18:17:24 +00001102 else
John McCallf746aa62010-03-19 23:29:14 +00001103 Aliasee = GetOrCreateLLVMGlobal(AA->getAliasee(),
Rafael Espindola6a836702010-03-04 18:17:24 +00001104 llvm::PointerType::getUnqual(DeclTy), 0);
Joerg Sonnenberger4695f912012-10-16 17:45:27 +00001105
1106 llvm::GlobalValue* F = cast<llvm::GlobalValue>(Aliasee);
1107 F->setLinkage(llvm::Function::ExternalWeakLinkage);
1108 WeakRefReferences.insert(F);
Rafael Espindola6a836702010-03-04 18:17:24 +00001109
1110 return Aliasee;
1111}
1112
Chris Lattnerb4880ba2009-05-12 21:21:08 +00001113void CodeGenModule::EmitGlobal(GlobalDecl GD) {
Anders Carlsson4a6835e2009-09-10 23:38:47 +00001114 const ValueDecl *Global = cast<ValueDecl>(GD.getDecl());
Mike Stump1eb44332009-09-09 15:08:12 +00001115
Rafael Espindola6a836702010-03-04 18:17:24 +00001116 // Weak references don't produce any output by themselves.
1117 if (Global->hasAttr<WeakRefAttr>())
1118 return;
1119
Chris Lattnerbd532712009-03-22 21:47:11 +00001120 // If this is an alias definition (which otherwise looks like a declaration)
1121 // emit it now.
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +00001122 if (Global->hasAttr<AliasAttr>())
John McCallf746aa62010-03-19 23:29:14 +00001123 return EmitAliasDefinition(GD);
Daniel Dunbar219df662008-09-08 23:44:31 +00001124
Peter Collingbourned51e43a2011-10-06 18:29:46 +00001125 // If this is CUDA, be selective about which declarations we emit.
David Blaikie4e4d0842012-03-11 07:00:24 +00001126 if (LangOpts.CUDA) {
Peter Collingbourned51e43a2011-10-06 18:29:46 +00001127 if (CodeGenOpts.CUDAIsDevice) {
1128 if (!Global->hasAttr<CUDADeviceAttr>() &&
1129 !Global->hasAttr<CUDAGlobalAttr>() &&
1130 !Global->hasAttr<CUDAConstantAttr>() &&
1131 !Global->hasAttr<CUDASharedAttr>())
1132 return;
1133 } else {
1134 if (!Global->hasAttr<CUDAHostAttr>() && (
1135 Global->hasAttr<CUDADeviceAttr>() ||
1136 Global->hasAttr<CUDAConstantAttr>() ||
1137 Global->hasAttr<CUDASharedAttr>()))
1138 return;
1139 }
1140 }
1141
Chris Lattner67b00522009-03-21 09:44:56 +00001142 // Ignore declarations, they will be emitted on their first use.
Daniel Dunbar5e1e1f92009-03-19 08:27:24 +00001143 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(Global)) {
Daniel Dunbar73241df2009-02-13 21:18:01 +00001144 // Forward declarations are emitted lazily on first use.
Nick Lewyckydce67a72011-07-18 05:26:13 +00001145 if (!FD->doesThisDeclarationHaveABody()) {
1146 if (!FD->doesDeclarationForceExternallyVisibleDefinition())
1147 return;
1148
1149 const FunctionDecl *InlineDefinition = 0;
1150 FD->getBody(InlineDefinition);
1151
Chris Lattner5f9e2722011-07-23 10:55:15 +00001152 StringRef MangledName = getMangledName(GD);
Benjamin Kramer7e423922012-03-24 18:22:12 +00001153 DeferredDecls.erase(MangledName);
Nick Lewyckydce67a72011-07-18 05:26:13 +00001154 EmitGlobalDefinition(InlineDefinition);
Daniel Dunbar73241df2009-02-13 21:18:01 +00001155 return;
Nick Lewyckydce67a72011-07-18 05:26:13 +00001156 }
Daniel Dunbar02698712009-02-13 20:29:50 +00001157 } else {
1158 const VarDecl *VD = cast<VarDecl>(Global);
Daniel Dunbarbd012ff2008-07-29 23:18:29 +00001159 assert(VD->isFileVarDecl() && "Cannot emit local var decl as global.");
1160
Douglas Gregora9a55c02010-02-06 05:15:45 +00001161 if (VD->isThisDeclarationADefinition() != VarDecl::Definition)
Douglas Gregorb6c8c8b2009-04-21 17:11:58 +00001162 return;
Nate Begeman4c13b7a2008-04-20 06:29:50 +00001163 }
1164
Chris Lattner67b00522009-03-21 09:44:56 +00001165 // Defer code generation when possible if this is a static definition, inline
1166 // function etc. These we only want to emit if they are used.
Chris Lattner4357a822010-04-13 17:39:09 +00001167 if (!MayDeferGeneration(Global)) {
1168 // Emit the definition if it can't be deferred.
1169 EmitGlobalDefinition(GD);
Daniel Dunbarbd012ff2008-07-29 23:18:29 +00001170 return;
1171 }
John McCallbf40cb52010-07-15 23:40:35 +00001172
1173 // If we're deferring emission of a C++ variable with an
1174 // initializer, remember the order in which it appeared in the file.
David Blaikie4e4d0842012-03-11 07:00:24 +00001175 if (getLangOpts().CPlusPlus && isa<VarDecl>(Global) &&
John McCallbf40cb52010-07-15 23:40:35 +00001176 cast<VarDecl>(Global)->hasInit()) {
1177 DelayedCXXInitPosition[Global] = CXXGlobalInits.size();
1178 CXXGlobalInits.push_back(0);
1179 }
Chris Lattner4357a822010-04-13 17:39:09 +00001180
1181 // If the value has already been used, add it directly to the
1182 // DeferredDeclsToEmit list.
Chris Lattner5f9e2722011-07-23 10:55:15 +00001183 StringRef MangledName = getMangledName(GD);
Chris Lattner4357a822010-04-13 17:39:09 +00001184 if (GetGlobalValue(MangledName))
1185 DeferredDeclsToEmit.push_back(GD);
1186 else {
1187 // Otherwise, remember that we saw a deferred decl with this name. The
1188 // first use of the mangled name will cause it to move into
1189 // DeferredDeclsToEmit.
1190 DeferredDecls[MangledName] = GD;
1191 }
Nate Begeman4c13b7a2008-04-20 06:29:50 +00001192}
1193
Rafael Espindolaa411d2f2011-10-26 20:41:06 +00001194namespace {
1195 struct FunctionIsDirectlyRecursive :
1196 public RecursiveASTVisitor<FunctionIsDirectlyRecursive> {
1197 const StringRef Name;
Rafael Espindolabcf6b982011-12-19 14:41:01 +00001198 const Builtin::Context &BI;
Rafael Espindolaa411d2f2011-10-26 20:41:06 +00001199 bool Result;
Rafael Espindolabcf6b982011-12-19 14:41:01 +00001200 FunctionIsDirectlyRecursive(StringRef N, const Builtin::Context &C) :
1201 Name(N), BI(C), Result(false) {
Rafael Espindolaa411d2f2011-10-26 20:41:06 +00001202 }
1203 typedef RecursiveASTVisitor<FunctionIsDirectlyRecursive> Base;
1204
1205 bool TraverseCallExpr(CallExpr *E) {
Rafael Espindolabcf6b982011-12-19 14:41:01 +00001206 const FunctionDecl *FD = E->getDirectCallee();
1207 if (!FD)
Rafael Espindolaa411d2f2011-10-26 20:41:06 +00001208 return true;
Rafael Espindolabcf6b982011-12-19 14:41:01 +00001209 AsmLabelAttr *Attr = FD->getAttr<AsmLabelAttr>();
1210 if (Attr && Name == Attr->getLabel()) {
1211 Result = true;
1212 return false;
1213 }
1214 unsigned BuiltinID = FD->getBuiltinID();
1215 if (!BuiltinID)
Rafael Espindolaa411d2f2011-10-26 20:41:06 +00001216 return true;
Nick Lewyckyf6b56372012-01-18 03:41:19 +00001217 StringRef BuiltinName = BI.GetName(BuiltinID);
1218 if (BuiltinName.startswith("__builtin_") &&
1219 Name == BuiltinName.slice(strlen("__builtin_"), StringRef::npos)) {
Rafael Espindolaa411d2f2011-10-26 20:41:06 +00001220 Result = true;
1221 return false;
1222 }
1223 return true;
1224 }
1225 };
1226}
1227
Rafael Espindolabcf6b982011-12-19 14:41:01 +00001228// isTriviallyRecursive - Check if this function calls another
1229// decl that, because of the asm attribute or the other decl being a builtin,
1230// ends up pointing to itself.
Rafael Espindolaa411d2f2011-10-26 20:41:06 +00001231bool
Rafael Espindolabcf6b982011-12-19 14:41:01 +00001232CodeGenModule::isTriviallyRecursive(const FunctionDecl *FD) {
1233 StringRef Name;
1234 if (getCXXABI().getMangleContext().shouldMangleDeclName(FD)) {
Nick Lewycky22afacc2012-01-18 01:50:13 +00001235 // asm labels are a special kind of mangling we have to support.
Rafael Espindolabcf6b982011-12-19 14:41:01 +00001236 AsmLabelAttr *Attr = FD->getAttr<AsmLabelAttr>();
1237 if (!Attr)
1238 return false;
1239 Name = Attr->getLabel();
1240 } else {
1241 Name = FD->getName();
1242 }
Rafael Espindolaa411d2f2011-10-26 20:41:06 +00001243
Rafael Espindolabcf6b982011-12-19 14:41:01 +00001244 FunctionIsDirectlyRecursive Walker(Name, Context.BuiltinInfo);
1245 Walker.TraverseFunctionDecl(const_cast<FunctionDecl*>(FD));
Rafael Espindolaa411d2f2011-10-26 20:41:06 +00001246 return Walker.Result;
1247}
1248
1249bool
Peter Collingbourne144a31f2013-06-05 17:49:37 +00001250CodeGenModule::shouldEmitFunction(GlobalDecl GD) {
1251 if (getFunctionLinkage(GD) != llvm::Function::AvailableExternallyLinkage)
Rafael Espindolaa411d2f2011-10-26 20:41:06 +00001252 return true;
Peter Collingbourne144a31f2013-06-05 17:49:37 +00001253 const FunctionDecl *F = cast<FunctionDecl>(GD.getDecl());
Rafael Espindolacc4889f2011-10-28 20:43:56 +00001254 if (CodeGenOpts.OptimizationLevel == 0 &&
Michael J. Spenceradc6cbf2012-06-18 07:00:48 +00001255 !F->hasAttr<AlwaysInlineAttr>() && !F->hasAttr<ForceInlineAttr>())
Rafael Espindolaa411d2f2011-10-26 20:41:06 +00001256 return false;
1257 // PR9614. Avoid cases where the source code is lying to us. An available
1258 // externally function should have an equivalent function somewhere else,
1259 // but a function that calls itself is clearly not equivalent to the real
1260 // implementation.
1261 // This happens in glibc's btowc and in some configure checks.
Rafael Espindolabcf6b982011-12-19 14:41:01 +00001262 return !isTriviallyRecursive(F);
Rafael Espindolaa411d2f2011-10-26 20:41:06 +00001263}
1264
Adrian Prantl0a050f72013-05-09 23:16:27 +00001265/// If the type for the method's class was generated by
1266/// CGDebugInfo::createContextChain(), the cache contains only a
1267/// limited DIType without any declarations. Since EmitFunctionStart()
1268/// needs to find the canonical declaration for each method, we need
1269/// to construct the complete type prior to emitting the method.
1270void CodeGenModule::CompleteDIClassType(const CXXMethodDecl* D) {
1271 if (!D->isInstance())
1272 return;
1273
1274 if (CGDebugInfo *DI = getModuleDebugInfo())
1275 if (getCodeGenOpts().getDebugInfo() >= CodeGenOptions::LimitedDebugInfo) {
1276 const PointerType *ThisPtr =
1277 cast<PointerType>(D->getThisType(getContext()));
1278 DI->getOrCreateRecordType(ThisPtr->getPointeeType(), D->getLocation());
1279 }
1280}
1281
Chris Lattnerb4880ba2009-05-12 21:21:08 +00001282void CodeGenModule::EmitGlobalDefinition(GlobalDecl GD) {
Anders Carlsson4a6835e2009-09-10 23:38:47 +00001283 const ValueDecl *D = cast<ValueDecl>(GD.getDecl());
Mike Stump1eb44332009-09-09 15:08:12 +00001284
Dan Gohmancb421fa2010-04-19 16:39:44 +00001285 PrettyStackTraceDecl CrashInfo(const_cast<ValueDecl *>(D), D->getLocation(),
Anders Carlsson8e2efcc2009-10-27 14:32:27 +00001286 Context.getSourceManager(),
1287 "Generating code for declaration");
1288
Peter Collingbourne144a31f2013-06-05 17:49:37 +00001289 if (isa<FunctionDecl>(D)) {
Douglas Gregor44eac332010-07-13 06:02:28 +00001290 // At -O0, don't generate IR for functions with available_externally
1291 // linkage.
Peter Collingbourne144a31f2013-06-05 17:49:37 +00001292 if (!shouldEmitFunction(GD))
Douglas Gregor44eac332010-07-13 06:02:28 +00001293 return;
Anders Carlsson7270ee42010-03-23 04:31:31 +00001294
Douglas Gregor44eac332010-07-13 06:02:28 +00001295 if (const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) {
Adrian Prantl0a050f72013-05-09 23:16:27 +00001296 CompleteDIClassType(Method);
Eli Friedman7dcdf5b2011-05-06 17:27:27 +00001297 // Make sure to emit the definition(s) before we emit the thunks.
1298 // This is necessary for the generation of certain thunks.
1299 if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(Method))
1300 EmitCXXConstructor(CD, GD.getCtorType());
1301 else if (const CXXDestructorDecl *DD =dyn_cast<CXXDestructorDecl>(Method))
1302 EmitCXXDestructor(DD, GD.getDtorType());
1303 else
1304 EmitGlobalFunctionDefinition(GD);
1305
Douglas Gregor44eac332010-07-13 06:02:28 +00001306 if (Method->isVirtual())
1307 getVTables().EmitThunks(GD);
1308
Eli Friedman7dcdf5b2011-05-06 17:27:27 +00001309 return;
Douglas Gregor44eac332010-07-13 06:02:28 +00001310 }
Chris Lattnerb5e81562010-04-13 17:57:11 +00001311
Chris Lattnerb5e81562010-04-13 17:57:11 +00001312 return EmitGlobalFunctionDefinition(GD);
Douglas Gregor44eac332010-07-13 06:02:28 +00001313 }
Chris Lattnerb5e81562010-04-13 17:57:11 +00001314
1315 if (const VarDecl *VD = dyn_cast<VarDecl>(D))
1316 return EmitGlobalVarDefinition(VD);
Chris Lattner4357a822010-04-13 17:39:09 +00001317
David Blaikieb219cfc2011-09-23 05:06:16 +00001318 llvm_unreachable("Invalid argument to EmitGlobalDefinition()");
Daniel Dunbarbd012ff2008-07-29 23:18:29 +00001319}
1320
Chris Lattner74391b42009-03-22 21:03:39 +00001321/// GetOrCreateLLVMFunction - If the specified mangled name is not in the
1322/// module, create and return an llvm Function with the specified type. If there
1323/// is something in the module with the specified name, return it potentially
1324/// bitcasted to the right type.
1325///
1326/// If D is non-null, it specifies a decl that correspond to this. This is used
1327/// to set the attributes on the function when it is first created.
John McCallf746aa62010-03-19 23:29:14 +00001328llvm::Constant *
Chris Lattner5f9e2722011-07-23 10:55:15 +00001329CodeGenModule::GetOrCreateLLVMFunction(StringRef MangledName,
Chris Lattner2acc6e32011-07-18 04:24:23 +00001330 llvm::Type *Ty,
John McCallf85e1932011-06-15 23:02:42 +00001331 GlobalDecl D, bool ForVTable,
Bill Wendlingc4c62fd2013-01-31 00:30:05 +00001332 llvm::AttributeSet ExtraAttrs) {
Chris Lattner0558e792009-03-21 09:25:43 +00001333 // Lookup the entry, lazily creating it if necessary.
John McCallf746aa62010-03-19 23:29:14 +00001334 llvm::GlobalValue *Entry = GetGlobalValue(MangledName);
Chris Lattner0558e792009-03-21 09:25:43 +00001335 if (Entry) {
Benjamin Kramerd48bcb22012-08-22 15:37:55 +00001336 if (WeakRefReferences.erase(Entry)) {
Rafael Espindola6a836702010-03-04 18:17:24 +00001337 const FunctionDecl *FD = cast_or_null<FunctionDecl>(D.getDecl());
1338 if (FD && !FD->hasAttr<WeakAttr>())
Anders Carlsson7270ee42010-03-23 04:31:31 +00001339 Entry->setLinkage(llvm::Function::ExternalLinkage);
Rafael Espindola6a836702010-03-04 18:17:24 +00001340 }
1341
Chris Lattner0558e792009-03-21 09:25:43 +00001342 if (Entry->getType()->getElementType() == Ty)
1343 return Entry;
Mike Stump1eb44332009-09-09 15:08:12 +00001344
Chris Lattner0558e792009-03-21 09:25:43 +00001345 // Make sure the result is of the correct type.
Chris Lattner9cbe4f02011-07-09 17:41:47 +00001346 return llvm::ConstantExpr::getBitCast(Entry, Ty->getPointerTo());
Chris Lattner0558e792009-03-21 09:25:43 +00001347 }
Mike Stump1eb44332009-09-09 15:08:12 +00001348
Eli Friedman654ad402009-11-09 05:07:37 +00001349 // This function doesn't have a complete type (for example, the return
1350 // type is an incomplete struct). Use a fake type instead, and make
1351 // sure not to try to set attributes.
1352 bool IsIncompleteFunction = false;
John McCall784f2112010-04-28 00:00:30 +00001353
Chris Lattner2acc6e32011-07-18 04:24:23 +00001354 llvm::FunctionType *FTy;
John McCall784f2112010-04-28 00:00:30 +00001355 if (isa<llvm::FunctionType>(Ty)) {
1356 FTy = cast<llvm::FunctionType>(Ty);
1357 } else {
John McCall0774cb82011-05-15 01:53:33 +00001358 FTy = llvm::FunctionType::get(VoidTy, false);
Eli Friedman654ad402009-11-09 05:07:37 +00001359 IsIncompleteFunction = true;
1360 }
Chris Lattnerbcaedae2010-06-30 19:14:05 +00001361
John McCall784f2112010-04-28 00:00:30 +00001362 llvm::Function *F = llvm::Function::Create(FTy,
Eli Friedman654ad402009-11-09 05:07:37 +00001363 llvm::Function::ExternalLinkage,
John McCallf746aa62010-03-19 23:29:14 +00001364 MangledName, &getModule());
1365 assert(F->getName() == MangledName && "name was uniqued!");
Eli Friedman654ad402009-11-09 05:07:37 +00001366 if (D.getDecl())
Anders Carlssonb2bcf1c2010-02-06 02:44:09 +00001367 SetFunctionAttributes(D, F, IsIncompleteFunction);
Bill Wendlingc4c62fd2013-01-31 00:30:05 +00001368 if (ExtraAttrs.hasAttributes(llvm::AttributeSet::FunctionIndex)) {
1369 llvm::AttrBuilder B(ExtraAttrs, llvm::AttributeSet::FunctionIndex);
Bill Wendling909b6de2013-01-23 00:21:06 +00001370 F->addAttributes(llvm::AttributeSet::FunctionIndex,
1371 llvm::AttributeSet::get(VMContext,
1372 llvm::AttributeSet::FunctionIndex,
1373 B));
1374 }
Eli Friedman654ad402009-11-09 05:07:37 +00001375
Chris Lattner67b00522009-03-21 09:44:56 +00001376 // This is the first use or definition of a mangled name. If there is a
1377 // deferred decl with this name, remember that we need to emit it at the end
1378 // of the file.
John McCallf746aa62010-03-19 23:29:14 +00001379 llvm::StringMap<GlobalDecl>::iterator DDI = DeferredDecls.find(MangledName);
Chris Lattner67b00522009-03-21 09:44:56 +00001380 if (DDI != DeferredDecls.end()) {
1381 // Move the potentially referenced deferred decl to the DeferredDeclsToEmit
1382 // list, and remove it from DeferredDecls (since we don't need it anymore).
1383 DeferredDeclsToEmit.push_back(DDI->second);
1384 DeferredDecls.erase(DDI);
John McCallbfdcdc82010-12-15 04:00:32 +00001385
1386 // Otherwise, there are cases we have to worry about where we're
1387 // using a declaration for which we must emit a definition but where
1388 // we might not find a top-level definition:
1389 // - member functions defined inline in their classes
1390 // - friend functions defined inline in some class
1391 // - special member functions with implicit definitions
1392 // If we ever change our AST traversal to walk into class methods,
1393 // this will be unnecessary.
Anders Carlsson1faa89f2011-02-05 04:35:53 +00001394 //
1395 // We also don't emit a definition for a function if it's going to be an entry
1396 // in a vtable, unless it's already marked as used.
David Blaikie4e4d0842012-03-11 07:00:24 +00001397 } else if (getLangOpts().CPlusPlus && D.getDecl()) {
John McCallbfdcdc82010-12-15 04:00:32 +00001398 // Look for a declaration that's lexically in a record.
1399 const FunctionDecl *FD = cast<FunctionDecl>(D.getDecl());
Eli Friedmanb135f0f2012-07-02 21:05:30 +00001400 FD = FD->getMostRecentDecl();
John McCallbfdcdc82010-12-15 04:00:32 +00001401 do {
1402 if (isa<CXXRecordDecl>(FD->getLexicalDeclContext())) {
Anders Carlsson1faa89f2011-02-05 04:35:53 +00001403 if (FD->isImplicit() && !ForVTable) {
John McCallbfdcdc82010-12-15 04:00:32 +00001404 assert(FD->isUsed() && "Sema didn't mark implicit function as used!");
Douglas Gregora29bf412011-02-09 02:03:05 +00001405 DeferredDeclsToEmit.push_back(D.getWithDecl(FD));
John McCallbfdcdc82010-12-15 04:00:32 +00001406 break;
Sean Hunt10620eb2011-05-06 20:44:56 +00001407 } else if (FD->doesThisDeclarationHaveABody()) {
Douglas Gregora29bf412011-02-09 02:03:05 +00001408 DeferredDeclsToEmit.push_back(D.getWithDecl(FD));
John McCallbfdcdc82010-12-15 04:00:32 +00001409 break;
1410 }
Rafael Espindola7b9a5aa2010-03-02 21:28:26 +00001411 }
Douglas Gregoref96ee02012-01-14 16:38:05 +00001412 FD = FD->getPreviousDecl();
John McCallbfdcdc82010-12-15 04:00:32 +00001413 } while (FD);
Chris Lattner67b00522009-03-21 09:44:56 +00001414 }
Mike Stump1eb44332009-09-09 15:08:12 +00001415
John McCall784f2112010-04-28 00:00:30 +00001416 // Make sure the result is of the requested type.
1417 if (!IsIncompleteFunction) {
1418 assert(F->getType()->getElementType() == Ty);
1419 return F;
1420 }
1421
Chris Lattner9cbe4f02011-07-09 17:41:47 +00001422 llvm::Type *PTy = llvm::PointerType::getUnqual(Ty);
John McCall784f2112010-04-28 00:00:30 +00001423 return llvm::ConstantExpr::getBitCast(F, PTy);
Chris Lattner0558e792009-03-21 09:25:43 +00001424}
1425
Chris Lattner74391b42009-03-22 21:03:39 +00001426/// GetAddrOfFunction - Return the address of the given function. If Ty is
1427/// non-null, then this function will use the specified type if it has to
1428/// create it (this occurs when we see a definition of the function).
Chris Lattnerb4880ba2009-05-12 21:21:08 +00001429llvm::Constant *CodeGenModule::GetAddrOfFunction(GlobalDecl GD,
Chris Lattner2acc6e32011-07-18 04:24:23 +00001430 llvm::Type *Ty,
Anders Carlsson1faa89f2011-02-05 04:35:53 +00001431 bool ForVTable) {
Chris Lattner74391b42009-03-22 21:03:39 +00001432 // If there was no specific requested type, just convert it now.
1433 if (!Ty)
Anders Carlsson4a6835e2009-09-10 23:38:47 +00001434 Ty = getTypes().ConvertType(cast<ValueDecl>(GD.getDecl())->getType());
Chris Lattnerbcaedae2010-06-30 19:14:05 +00001435
Chris Lattner5f9e2722011-07-23 10:55:15 +00001436 StringRef MangledName = getMangledName(GD);
Anders Carlsson1faa89f2011-02-05 04:35:53 +00001437 return GetOrCreateLLVMFunction(MangledName, Ty, GD, ForVTable);
Chris Lattner74391b42009-03-22 21:03:39 +00001438}
Eli Friedman77ba7082008-05-30 19:50:47 +00001439
Chris Lattner74391b42009-03-22 21:03:39 +00001440/// CreateRuntimeFunction - Create a new runtime function with the specified
1441/// type and name.
1442llvm::Constant *
Chris Lattner2acc6e32011-07-18 04:24:23 +00001443CodeGenModule::CreateRuntimeFunction(llvm::FunctionType *FTy,
Chris Lattner5f9e2722011-07-23 10:55:15 +00001444 StringRef Name,
Bill Wendlingc4c62fd2013-01-31 00:30:05 +00001445 llvm::AttributeSet ExtraAttrs) {
John McCallbd7370a2013-02-28 19:01:20 +00001446 llvm::Constant *C
1447 = GetOrCreateLLVMFunction(Name, FTy, GlobalDecl(), /*ForVTable=*/false,
1448 ExtraAttrs);
1449 if (llvm::Function *F = dyn_cast<llvm::Function>(C))
1450 if (F->empty())
1451 F->setCallingConv(getRuntimeCC());
1452 return C;
Chris Lattner74391b42009-03-22 21:03:39 +00001453}
Daniel Dunbarbd012ff2008-07-29 23:18:29 +00001454
Richard Smitha9b21d22012-02-17 06:48:11 +00001455/// isTypeConstant - Determine whether an object of this type can be emitted
1456/// as a constant.
1457///
1458/// If ExcludeCtor is true, the duration when the object's constructor runs
1459/// will not be considered. The caller will need to verify that the object is
1460/// not written to during its construction.
1461bool CodeGenModule::isTypeConstant(QualType Ty, bool ExcludeCtor) {
1462 if (!Ty.isConstant(Context) && !Ty->isReferenceType())
Eli Friedman20e098b2009-12-11 21:23:03 +00001463 return false;
Richard Smitha9b21d22012-02-17 06:48:11 +00001464
David Blaikie4e4d0842012-03-11 07:00:24 +00001465 if (Context.getLangOpts().CPlusPlus) {
Richard Smitha9b21d22012-02-17 06:48:11 +00001466 if (const CXXRecordDecl *Record
1467 = Context.getBaseElementType(Ty)->getAsCXXRecordDecl())
1468 return ExcludeCtor && !Record->hasMutableFields() &&
1469 Record->hasTrivialDestructor();
Eli Friedman20e098b2009-12-11 21:23:03 +00001470 }
Richard Smitha9b21d22012-02-17 06:48:11 +00001471
Eli Friedman20e098b2009-12-11 21:23:03 +00001472 return true;
1473}
1474
Chris Lattner74391b42009-03-22 21:03:39 +00001475/// GetOrCreateLLVMGlobal - If the specified mangled name is not in the module,
1476/// create and return an llvm GlobalVariable with the specified type. If there
1477/// is something in the module with the specified name, return it potentially
1478/// bitcasted to the right type.
1479///
1480/// If D is non-null, it specifies a decl that correspond to this. This is used
1481/// to set the attributes on the global when it is first created.
John McCallf746aa62010-03-19 23:29:14 +00001482llvm::Constant *
Chris Lattner5f9e2722011-07-23 10:55:15 +00001483CodeGenModule::GetOrCreateLLVMGlobal(StringRef MangledName,
Chris Lattner2acc6e32011-07-18 04:24:23 +00001484 llvm::PointerType *Ty,
Rafael Espindolac532b502011-01-18 21:07:57 +00001485 const VarDecl *D,
1486 bool UnnamedAddr) {
Daniel Dunbar3c827a72008-08-05 23:31:02 +00001487 // Lookup the entry, lazily creating it if necessary.
John McCallf746aa62010-03-19 23:29:14 +00001488 llvm::GlobalValue *Entry = GetGlobalValue(MangledName);
Chris Lattner99b53612009-03-21 08:03:33 +00001489 if (Entry) {
Benjamin Kramerd48bcb22012-08-22 15:37:55 +00001490 if (WeakRefReferences.erase(Entry)) {
Rafael Espindola6a836702010-03-04 18:17:24 +00001491 if (D && !D->hasAttr<WeakAttr>())
Anders Carlsson7270ee42010-03-23 04:31:31 +00001492 Entry->setLinkage(llvm::Function::ExternalLinkage);
Rafael Espindola6a836702010-03-04 18:17:24 +00001493 }
1494
Rafael Espindolac532b502011-01-18 21:07:57 +00001495 if (UnnamedAddr)
1496 Entry->setUnnamedAddr(true);
1497
Chris Lattner74391b42009-03-22 21:03:39 +00001498 if (Entry->getType() == Ty)
Chris Lattner570585c2009-03-21 09:16:30 +00001499 return Entry;
Mike Stump1eb44332009-09-09 15:08:12 +00001500
Chris Lattner99b53612009-03-21 08:03:33 +00001501 // Make sure the result is of the correct type.
Owen Anderson3c4972d2009-07-29 18:54:39 +00001502 return llvm::ConstantExpr::getBitCast(Entry, Ty);
Daniel Dunbar49988882009-01-13 02:25:00 +00001503 }
Mike Stump1eb44332009-09-09 15:08:12 +00001504
Chris Lattner67b00522009-03-21 09:44:56 +00001505 // This is the first use or definition of a mangled name. If there is a
1506 // deferred decl with this name, remember that we need to emit it at the end
1507 // of the file.
John McCallf746aa62010-03-19 23:29:14 +00001508 llvm::StringMap<GlobalDecl>::iterator DDI = DeferredDecls.find(MangledName);
Chris Lattner67b00522009-03-21 09:44:56 +00001509 if (DDI != DeferredDecls.end()) {
1510 // Move the potentially referenced deferred decl to the DeferredDeclsToEmit
1511 // list, and remove it from DeferredDecls (since we don't need it anymore).
1512 DeferredDeclsToEmit.push_back(DDI->second);
1513 DeferredDecls.erase(DDI);
1514 }
Mike Stump1eb44332009-09-09 15:08:12 +00001515
Peter Collingbourne4dc34eb2012-05-20 21:08:35 +00001516 unsigned AddrSpace = GetGlobalVarAddressSpace(D, Ty->getAddressSpace());
Mike Stump1eb44332009-09-09 15:08:12 +00001517 llvm::GlobalVariable *GV =
1518 new llvm::GlobalVariable(getModule(), Ty->getElementType(), false,
Chris Lattner99b53612009-03-21 08:03:33 +00001519 llvm::GlobalValue::ExternalLinkage,
John McCallf746aa62010-03-19 23:29:14 +00001520 0, MangledName, 0,
Hans Wennborg5e2d5de2012-06-23 11:51:46 +00001521 llvm::GlobalVariable::NotThreadLocal, AddrSpace);
Chris Lattner99b53612009-03-21 08:03:33 +00001522
1523 // Handle things which are present even on external declarations.
Chris Lattner74391b42009-03-22 21:03:39 +00001524 if (D) {
Mike Stumpf5408fe2009-05-16 07:57:57 +00001525 // FIXME: This code is overly simple and should be merged with other global
1526 // handling.
Richard Smitha9b21d22012-02-17 06:48:11 +00001527 GV->setConstant(isTypeConstant(D->getType(), false));
Chris Lattner99b53612009-03-21 08:03:33 +00001528
John McCall110e8e52010-10-29 22:22:43 +00001529 // Set linkage and visibility in case we never see a definition.
Rafael Espindola2beda122013-02-27 02:15:29 +00001530 LinkageInfo LV = D->getLinkageAndVisibility();
Rafael Espindolaf127eb82013-02-27 02:56:45 +00001531 if (LV.getLinkage() != ExternalLinkage) {
John McCall15e310a2011-02-19 02:53:41 +00001532 // Don't set internal linkage on declarations.
John McCall110e8e52010-10-29 22:22:43 +00001533 } else {
1534 if (D->hasAttr<DLLImportAttr>())
1535 GV->setLinkage(llvm::GlobalValue::DLLImportLinkage);
Douglas Gregor0a0d2b12011-03-23 00:50:03 +00001536 else if (D->hasAttr<WeakAttr>() || D->isWeakImported())
John McCall110e8e52010-10-29 22:22:43 +00001537 GV->setLinkage(llvm::GlobalValue::ExternalWeakLinkage);
Chris Lattner99b53612009-03-21 08:03:33 +00001538
John McCallaf146032010-10-30 11:50:40 +00001539 // Set visibility on a declaration only if it's explicit.
Rafael Espindolaf127eb82013-02-27 02:56:45 +00001540 if (LV.isVisibilityExplicit())
1541 GV->setVisibility(GetLLVMVisibility(LV.getVisibility()));
John McCall110e8e52010-10-29 22:22:43 +00001542 }
Eli Friedman56ebe502009-04-19 21:05:03 +00001543
Richard Smithb80a16e2013-04-19 16:42:07 +00001544 if (D->getTLSKind()) {
Richard Smithdb4f61f2013-04-22 08:06:17 +00001545 if (D->getTLSKind() == VarDecl::TLS_Dynamic)
1546 CXXThreadLocals.push_back(std::make_pair(D, GV));
Hans Wennborgde981f32012-06-28 08:01:44 +00001547 setTLSMode(GV, *D);
Richard Smithb80a16e2013-04-19 16:42:07 +00001548 }
Chris Lattner74391b42009-03-22 21:03:39 +00001549 }
Mike Stump1eb44332009-09-09 15:08:12 +00001550
Peter Collingbourne4dc34eb2012-05-20 21:08:35 +00001551 if (AddrSpace != Ty->getAddressSpace())
1552 return llvm::ConstantExpr::getBitCast(GV, Ty);
1553 else
1554 return GV;
Daniel Dunbarbd012ff2008-07-29 23:18:29 +00001555}
1556
Chris Lattner74391b42009-03-22 21:03:39 +00001557
Anders Carlsson3bd62022011-01-29 18:20:20 +00001558llvm::GlobalVariable *
Chris Lattner5f9e2722011-07-23 10:55:15 +00001559CodeGenModule::CreateOrReplaceCXXRuntimeVariable(StringRef Name,
Chris Lattner2acc6e32011-07-18 04:24:23 +00001560 llvm::Type *Ty,
Anders Carlsson3bd62022011-01-29 18:20:20 +00001561 llvm::GlobalValue::LinkageTypes Linkage) {
1562 llvm::GlobalVariable *GV = getModule().getNamedGlobal(Name);
1563 llvm::GlobalVariable *OldGV = 0;
1564
1565
1566 if (GV) {
1567 // Check if the variable has the right type.
1568 if (GV->getType()->getElementType() == Ty)
1569 return GV;
1570
1571 // Because C++ name mangling, the only way we can end up with an already
1572 // existing global with the same name is if it has been declared extern "C".
Nico Weberc5f80462012-10-11 10:13:44 +00001573 assert(GV->isDeclaration() && "Declaration has wrong type!");
Anders Carlsson3bd62022011-01-29 18:20:20 +00001574 OldGV = GV;
1575 }
1576
1577 // Create a new variable.
1578 GV = new llvm::GlobalVariable(getModule(), Ty, /*isConstant=*/true,
1579 Linkage, 0, Name);
1580
1581 if (OldGV) {
1582 // Replace occurrences of the old variable if needed.
1583 GV->takeName(OldGV);
1584
1585 if (!OldGV->use_empty()) {
1586 llvm::Constant *NewPtrForOldDecl =
1587 llvm::ConstantExpr::getBitCast(GV, OldGV->getType());
1588 OldGV->replaceAllUsesWith(NewPtrForOldDecl);
1589 }
1590
1591 OldGV->eraseFromParent();
1592 }
1593
1594 return GV;
1595}
1596
Chris Lattner74391b42009-03-22 21:03:39 +00001597/// GetAddrOfGlobalVar - Return the llvm::Constant for the address of the
1598/// given global variable. If Ty is non-null and if the global doesn't exist,
Eric Christopher0ff258b2012-04-16 23:55:04 +00001599/// then it will be created with the specified type instead of whatever the
Chris Lattner74391b42009-03-22 21:03:39 +00001600/// normal requested type would be.
1601llvm::Constant *CodeGenModule::GetAddrOfGlobalVar(const VarDecl *D,
Chris Lattner2acc6e32011-07-18 04:24:23 +00001602 llvm::Type *Ty) {
Chris Lattner74391b42009-03-22 21:03:39 +00001603 assert(D->hasGlobalStorage() && "Not a global variable");
1604 QualType ASTTy = D->getType();
1605 if (Ty == 0)
1606 Ty = getTypes().ConvertTypeForMem(ASTTy);
Mike Stump1eb44332009-09-09 15:08:12 +00001607
Chris Lattner2acc6e32011-07-18 04:24:23 +00001608 llvm::PointerType *PTy =
Peter Collingbourne207f4d82011-03-18 22:38:29 +00001609 llvm::PointerType::get(Ty, getContext().getTargetAddressSpace(ASTTy));
John McCallf746aa62010-03-19 23:29:14 +00001610
Chris Lattner5f9e2722011-07-23 10:55:15 +00001611 StringRef MangledName = getMangledName(D);
John McCallf746aa62010-03-19 23:29:14 +00001612 return GetOrCreateLLVMGlobal(MangledName, PTy, D);
Chris Lattner74391b42009-03-22 21:03:39 +00001613}
1614
1615/// CreateRuntimeVariable - Create a new runtime global variable with the
1616/// specified type and name.
1617llvm::Constant *
Chris Lattner2acc6e32011-07-18 04:24:23 +00001618CodeGenModule::CreateRuntimeVariable(llvm::Type *Ty,
Chris Lattner5f9e2722011-07-23 10:55:15 +00001619 StringRef Name) {
John McCall1de4d4e2011-04-07 08:22:57 +00001620 return GetOrCreateLLVMGlobal(Name, llvm::PointerType::getUnqual(Ty), 0,
Rafael Espindolac532b502011-01-18 21:07:57 +00001621 true);
Chris Lattner74391b42009-03-22 21:03:39 +00001622}
1623
Daniel Dunbar03f5ad92009-04-15 22:08:45 +00001624void CodeGenModule::EmitTentativeDefinition(const VarDecl *D) {
1625 assert(!D->getInit() && "Cannot emit definite definitions here!");
1626
Douglas Gregor7520bd12009-04-21 19:28:58 +00001627 if (MayDeferGeneration(D)) {
1628 // If we have not seen a reference to this variable yet, place it
1629 // into the deferred declarations table to be emitted if needed
1630 // later.
Chris Lattner5f9e2722011-07-23 10:55:15 +00001631 StringRef MangledName = getMangledName(D);
John McCallf746aa62010-03-19 23:29:14 +00001632 if (!GetGlobalValue(MangledName)) {
Anders Carlsson555b4bb2009-09-10 23:43:36 +00001633 DeferredDecls[MangledName] = D;
Daniel Dunbar03f5ad92009-04-15 22:08:45 +00001634 return;
Douglas Gregor7520bd12009-04-21 19:28:58 +00001635 }
1636 }
1637
1638 // The tentative definition is the only definition.
Daniel Dunbar03f5ad92009-04-15 22:08:45 +00001639 EmitGlobalVarDefinition(D);
1640}
1641
Chris Lattner2acc6e32011-07-18 04:24:23 +00001642CharUnits CodeGenModule::GetTargetTypeStoreSize(llvm::Type *Ty) const {
Ken Dyck06f486e2011-01-18 02:01:14 +00001643 return Context.toCharUnitsFromBits(
Micah Villmow25a6a842012-10-08 16:25:52 +00001644 TheDataLayout.getTypeStoreSizeInBits(Ty));
Ken Dyck687cc4a2010-01-26 13:48:07 +00001645}
1646
Peter Collingbourne4dc34eb2012-05-20 21:08:35 +00001647unsigned CodeGenModule::GetGlobalVarAddressSpace(const VarDecl *D,
1648 unsigned AddrSpace) {
1649 if (LangOpts.CUDA && CodeGenOpts.CUDAIsDevice) {
1650 if (D->hasAttr<CUDAConstantAttr>())
1651 AddrSpace = getContext().getTargetAddressSpace(LangAS::cuda_constant);
1652 else if (D->hasAttr<CUDASharedAttr>())
1653 AddrSpace = getContext().getTargetAddressSpace(LangAS::cuda_shared);
1654 else
1655 AddrSpace = getContext().getTargetAddressSpace(LangAS::cuda_device);
1656 }
1657
1658 return AddrSpace;
1659}
1660
Richard Smith00249372013-04-06 05:00:46 +00001661template<typename SomeDecl>
1662void CodeGenModule::MaybeHandleStaticInExternC(const SomeDecl *D,
1663 llvm::GlobalValue *GV) {
1664 if (!getLangOpts().CPlusPlus)
1665 return;
1666
1667 // Must have 'used' attribute, or else inline assembly can't rely on
1668 // the name existing.
1669 if (!D->template hasAttr<UsedAttr>())
1670 return;
1671
1672 // Must have internal linkage and an ordinary name.
Rafael Espindola181e3ec2013-05-13 00:12:11 +00001673 if (!D->getIdentifier() || D->getFormalLinkage() != InternalLinkage)
Richard Smith00249372013-04-06 05:00:46 +00001674 return;
1675
1676 // Must be in an extern "C" context. Entities declared directly within
1677 // a record are not extern "C" even if the record is in such a context.
Rafael Espindolad8ffd0b2013-05-05 20:15:21 +00001678 const SomeDecl *First = D->getFirstDeclaration();
1679 if (First->getDeclContext()->isRecord() || !First->isInExternCContext())
Richard Smith00249372013-04-06 05:00:46 +00001680 return;
1681
1682 // OK, this is an internal linkage entity inside an extern "C" linkage
1683 // specification. Make a note of that so we can give it the "expected"
1684 // mangled name if nothing else is using that name.
Richard Smith67972042013-04-06 07:07:44 +00001685 std::pair<StaticExternCMap::iterator, bool> R =
1686 StaticExternCValues.insert(std::make_pair(D->getIdentifier(), GV));
Richard Smith00249372013-04-06 05:00:46 +00001687
1688 // If we have multiple internal linkage entities with the same name
1689 // in extern "C" regions, none of them gets that name.
Richard Smith67972042013-04-06 07:07:44 +00001690 if (!R.second)
1691 R.first->second = 0;
Richard Smith00249372013-04-06 05:00:46 +00001692}
1693
Daniel Dunbarbd012ff2008-07-29 23:18:29 +00001694void CodeGenModule::EmitGlobalVarDefinition(const VarDecl *D) {
Chris Lattner8f32f712007-07-14 00:23:28 +00001695 llvm::Constant *Init = 0;
Eli Friedman77ba7082008-05-30 19:50:47 +00001696 QualType ASTTy = D->getType();
Richard Smith7ca48502012-02-13 22:16:19 +00001697 CXXRecordDecl *RD = ASTTy->getBaseElementTypeUnsafe()->getAsCXXRecordDecl();
1698 bool NeedsGlobalCtor = false;
1699 bool NeedsGlobalDtor = RD && !RD->hasTrivialDestructor();
Mike Stump1eb44332009-09-09 15:08:12 +00001700
Richard Smith2d6a5672012-01-14 04:30:29 +00001701 const VarDecl *InitDecl;
1702 const Expr *InitExpr = D->getAnyInitializer(InitDecl);
Sebastian Redl19b1a6e2012-02-25 20:51:20 +00001703
Anders Carlsson3bb92692010-01-26 17:43:42 +00001704 if (!InitExpr) {
Eli Friedmancd5f4aa2008-05-30 20:39:54 +00001705 // This is a tentative definition; tentative definitions are
Daniel Dunbar03f5ad92009-04-15 22:08:45 +00001706 // implicitly initialized with { 0 }.
1707 //
1708 // Note that tentative definitions are only emitted at the end of
1709 // a translation unit, so they should never have incomplete
1710 // type. In addition, EmitTentativeDefinition makes sure that we
1711 // never attempt to emit a tentative definition if a real one
1712 // exists. A use may still exists, however, so we still may need
1713 // to do a RAUW.
1714 assert(!ASTTy->isIncompleteType() && "Unexpected incomplete type");
Anders Carlssonb0d0ea02009-08-02 21:18:22 +00001715 Init = EmitNullConstant(D->getType());
Eli Friedman77ba7082008-05-30 19:50:47 +00001716 } else {
Richard Smith7c3e6152013-06-12 22:31:48 +00001717 initializedGlobalDecl = GlobalDecl(D);
1718 Init = EmitConstantInit(*InitDecl);
Sebastian Redl19b1a6e2012-02-25 20:51:20 +00001719
Fariborz Jahanian4904bf42012-06-26 16:06:38 +00001720 if (!Init) {
Anders Carlsson3bb92692010-01-26 17:43:42 +00001721 QualType T = InitExpr->getType();
Douglas Gregorc446d182010-05-05 20:15:55 +00001722 if (D->getType()->isReferenceType())
1723 T = D->getType();
Richard Smith2d6a5672012-01-14 04:30:29 +00001724
David Blaikie4e4d0842012-03-11 07:00:24 +00001725 if (getLangOpts().CPlusPlus) {
Anders Carlsson89ed31d2009-08-08 23:24:23 +00001726 Init = EmitNullConstant(T);
Richard Smith7ca48502012-02-13 22:16:19 +00001727 NeedsGlobalCtor = true;
Anders Carlsson89ed31d2009-08-08 23:24:23 +00001728 } else {
1729 ErrorUnsupported(D, "static initializer");
1730 Init = llvm::UndefValue::get(getTypes().ConvertType(T));
1731 }
John McCallbf40cb52010-07-15 23:40:35 +00001732 } else {
1733 // We don't need an initializer, so remove the entry for the delayed
Richard Smith7ca48502012-02-13 22:16:19 +00001734 // initializer position (just in case this entry was delayed) if we
1735 // also don't need to register a destructor.
David Blaikie4e4d0842012-03-11 07:00:24 +00001736 if (getLangOpts().CPlusPlus && !NeedsGlobalDtor)
John McCallbf40cb52010-07-15 23:40:35 +00001737 DelayedCXXInitPosition.erase(D);
Eli Friedman6e656f42009-02-20 01:18:21 +00001738 }
Eli Friedman77ba7082008-05-30 19:50:47 +00001739 }
Eli Friedman77ba7082008-05-30 19:50:47 +00001740
Chris Lattner2acc6e32011-07-18 04:24:23 +00001741 llvm::Type* InitType = Init->getType();
Chris Lattner570585c2009-03-21 09:16:30 +00001742 llvm::Constant *Entry = GetAddrOfGlobalVar(D, InitType);
Mike Stump1eb44332009-09-09 15:08:12 +00001743
Chris Lattner570585c2009-03-21 09:16:30 +00001744 // Strip off a bitcast if we got one back.
1745 if (llvm::ConstantExpr *CE = dyn_cast<llvm::ConstantExpr>(Entry)) {
Chris Lattner9d4a15f2009-07-16 16:48:25 +00001746 assert(CE->getOpcode() == llvm::Instruction::BitCast ||
1747 // all zero index gep.
1748 CE->getOpcode() == llvm::Instruction::GetElementPtr);
Chris Lattner570585c2009-03-21 09:16:30 +00001749 Entry = CE->getOperand(0);
1750 }
Mike Stump1eb44332009-09-09 15:08:12 +00001751
Chris Lattner570585c2009-03-21 09:16:30 +00001752 // Entry is now either a Function or GlobalVariable.
1753 llvm::GlobalVariable *GV = dyn_cast<llvm::GlobalVariable>(Entry);
Mike Stump1eb44332009-09-09 15:08:12 +00001754
Chris Lattner570585c2009-03-21 09:16:30 +00001755 // We have a definition after a declaration with the wrong type.
1756 // We must make a new GlobalVariable* and update everything that used OldGV
1757 // (a declaration or tentative definition) with the new GlobalVariable*
1758 // (which will be a definition).
1759 //
1760 // This happens if there is a prototype for a global (e.g.
1761 // "extern int x[];") and then a definition of a different type (e.g.
1762 // "int x[10];"). This also happens when an initializer has a different type
1763 // from the type of the global (this happens with unions).
Chris Lattner570585c2009-03-21 09:16:30 +00001764 if (GV == 0 ||
1765 GV->getType()->getElementType() != InitType ||
Peter Collingbourne207f4d82011-03-18 22:38:29 +00001766 GV->getType()->getAddressSpace() !=
Peter Collingbourne4dc34eb2012-05-20 21:08:35 +00001767 GetGlobalVarAddressSpace(D, getContext().getTargetAddressSpace(ASTTy))) {
Mike Stump1eb44332009-09-09 15:08:12 +00001768
John McCallf746aa62010-03-19 23:29:14 +00001769 // Move the old entry aside so that we'll create a new one.
Chris Lattner5f9e2722011-07-23 10:55:15 +00001770 Entry->setName(StringRef());
Daniel Dunbar232350d2009-02-19 05:36:41 +00001771
Chris Lattner570585c2009-03-21 09:16:30 +00001772 // Make a new global with the correct type, this is now guaranteed to work.
1773 GV = cast<llvm::GlobalVariable>(GetAddrOfGlobalVar(D, InitType));
Chris Lattner0558e792009-03-21 09:25:43 +00001774
Eli Friedman77ba7082008-05-30 19:50:47 +00001775 // Replace all uses of the old global with the new global
Mike Stump1eb44332009-09-09 15:08:12 +00001776 llvm::Constant *NewPtrForOldDecl =
Owen Anderson3c4972d2009-07-29 18:54:39 +00001777 llvm::ConstantExpr::getBitCast(GV, Entry->getType());
Chris Lattner570585c2009-03-21 09:16:30 +00001778 Entry->replaceAllUsesWith(NewPtrForOldDecl);
Eli Friedman77ba7082008-05-30 19:50:47 +00001779
1780 // Erase the old global, since it is no longer used.
Chris Lattner570585c2009-03-21 09:16:30 +00001781 cast<llvm::GlobalValue>(Entry)->eraseFromParent();
Chris Lattner8f32f712007-07-14 00:23:28 +00001782 }
Devang Patel8e53e722007-10-26 16:31:40 +00001783
Richard Smith00249372013-04-06 05:00:46 +00001784 MaybeHandleStaticInExternC(D, GV);
1785
Julien Lerouge77f68bb2011-09-09 22:41:49 +00001786 if (D->hasAttr<AnnotateAttr>())
1787 AddGlobalAnnotations(D, GV);
Nate Begeman8bd4afe2008-04-19 04:17:09 +00001788
Chris Lattner88a69ad2007-07-13 05:13:43 +00001789 GV->setInitializer(Init);
Chris Lattnere78b86f2009-08-05 05:20:29 +00001790
1791 // If it is safe to mark the global 'constant', do so now.
Richard Smitha9b21d22012-02-17 06:48:11 +00001792 GV->setConstant(!NeedsGlobalCtor && !NeedsGlobalDtor &&
1793 isTypeConstant(D->getType(), true));
Mike Stump1eb44332009-09-09 15:08:12 +00001794
Ken Dyck8b752f12010-01-27 17:10:57 +00001795 GV->setAlignment(getContext().getDeclAlign(D).getQuantity());
Richard Smitha9b21d22012-02-17 06:48:11 +00001796
Chris Lattner88a69ad2007-07-13 05:13:43 +00001797 // Set the llvm linkage type as appropriate.
Fariborz Jahanian354e7122010-10-27 16:21:54 +00001798 llvm::GlobalValue::LinkageTypes Linkage =
Eli Friedman07369dd2013-07-01 20:22:57 +00001799 GetLLVMLinkageVarDefinition(D, GV->isConstant());
Fariborz Jahanian354e7122010-10-27 16:21:54 +00001800 GV->setLinkage(Linkage);
1801 if (Linkage == llvm::GlobalVariable::CommonLinkage)
Chris Lattnere78b86f2009-08-05 05:20:29 +00001802 // common vars aren't constant even if declared const.
1803 GV->setConstant(false);
Daniel Dunbar7e714cd2009-04-10 20:26:50 +00001804
Daniel Dunbar7c65e992009-04-14 08:05:55 +00001805 SetCommonAttributes(D, GV);
Daniel Dunbar04d40782009-04-14 06:00:08 +00001806
John McCall3030eb82010-11-06 09:44:32 +00001807 // Emit the initializer function if necessary.
Richard Smith7ca48502012-02-13 22:16:19 +00001808 if (NeedsGlobalCtor || NeedsGlobalDtor)
1809 EmitCXXGlobalVarDeclInitFunc(D, GV, NeedsGlobalCtor);
John McCall3030eb82010-11-06 09:44:32 +00001810
Kostya Serebryany05c5ebc2012-08-21 06:53:28 +00001811 // If we are compiling with ASan, add metadata indicating dynamically
1812 // initialized globals.
Will Dietz4f45bc02013-01-18 11:30:38 +00001813 if (SanOpts.Address && NeedsGlobalCtor) {
Kostya Serebryany05c5ebc2012-08-21 06:53:28 +00001814 llvm::Module &M = getModule();
1815
1816 llvm::NamedMDNode *DynamicInitializers =
1817 M.getOrInsertNamedMetadata("llvm.asan.dynamically_initialized_globals");
1818 llvm::Value *GlobalToAdd[] = { GV };
1819 llvm::MDNode *ThisGlobal = llvm::MDNode::get(VMContext, GlobalToAdd);
1820 DynamicInitializers->addOperand(ThisGlobal);
1821 }
1822
Sanjiv Gupta686226b2008-06-05 08:59:10 +00001823 // Emit global variable debug information.
Eric Christopher73fb3502011-10-13 21:45:18 +00001824 if (CGDebugInfo *DI = getModuleDebugInfo())
Douglas Gregor4cdad312012-10-23 20:05:01 +00001825 if (getCodeGenOpts().getDebugInfo() >= CodeGenOptions::LimitedDebugInfo)
Alexey Samsonovfd00eec2012-05-04 07:39:27 +00001826 DI->EmitGlobalVariable(GV, D);
Chris Lattner88a69ad2007-07-13 05:13:43 +00001827}
Reid Spencer5f016e22007-07-11 17:01:13 +00001828
Fariborz Jahanian354e7122010-10-27 16:21:54 +00001829llvm::GlobalValue::LinkageTypes
Eli Friedman07369dd2013-07-01 20:22:57 +00001830CodeGenModule::GetLLVMLinkageVarDefinition(const VarDecl *D, bool isConstant) {
Fariborz Jahanian354e7122010-10-27 16:21:54 +00001831 GVALinkage Linkage = getContext().GetGVALinkageForVariable(D);
1832 if (Linkage == GVA_Internal)
1833 return llvm::Function::InternalLinkage;
1834 else if (D->hasAttr<DLLImportAttr>())
1835 return llvm::Function::DLLImportLinkage;
1836 else if (D->hasAttr<DLLExportAttr>())
1837 return llvm::Function::DLLExportLinkage;
Reid Klecknera7225342013-05-20 14:02:37 +00001838 else if (D->hasAttr<SelectAnyAttr>()) {
1839 // selectany symbols are externally visible, so use weak instead of
1840 // linkonce. MSVC optimizes away references to const selectany globals, so
1841 // all definitions should be the same and ODR linkage should be used.
1842 // http://msdn.microsoft.com/en-us/library/5tkz6s71.aspx
1843 return llvm::GlobalVariable::WeakODRLinkage;
1844 } else if (D->hasAttr<WeakAttr>()) {
Eli Friedman07369dd2013-07-01 20:22:57 +00001845 if (isConstant)
Fariborz Jahanian354e7122010-10-27 16:21:54 +00001846 return llvm::GlobalVariable::WeakODRLinkage;
1847 else
1848 return llvm::GlobalVariable::WeakAnyLinkage;
1849 } else if (Linkage == GVA_TemplateInstantiation ||
1850 Linkage == GVA_ExplicitTemplateInstantiation)
John McCall99ace162011-04-12 01:46:54 +00001851 return llvm::GlobalVariable::WeakODRLinkage;
David Blaikie4e4d0842012-03-11 07:00:24 +00001852 else if (!getLangOpts().CPlusPlus &&
Eric Christophera6cf1e72010-12-02 02:45:55 +00001853 ((!CodeGenOpts.NoCommon && !D->getAttr<NoCommonAttr>()) ||
1854 D->getAttr<CommonAttr>()) &&
Fariborz Jahanian354e7122010-10-27 16:21:54 +00001855 !D->hasExternalStorage() && !D->getInit() &&
Richard Smith38afbc72013-04-13 02:43:54 +00001856 !D->getAttr<SectionAttr>() && !D->getTLSKind() &&
Fariborz Jahanianab27d6e2011-06-20 17:50:03 +00001857 !D->getAttr<WeakImportAttr>()) {
Fariborz Jahanian354e7122010-10-27 16:21:54 +00001858 // Thread local vars aren't considered common linkage.
1859 return llvm::GlobalVariable::CommonLinkage;
Bill Wendling4e3b54b2013-05-02 19:18:03 +00001860 } else if (D->getTLSKind() == VarDecl::TLS_Dynamic &&
1861 getTarget().getTriple().isMacOSX())
1862 // On Darwin, the backing variable for a C++11 thread_local variable always
1863 // has internal linkage; all accesses should just be calls to the
1864 // Itanium-specified entry point, which has the normal linkage of the
1865 // variable.
1866 return llvm::GlobalValue::InternalLinkage;
Fariborz Jahanian354e7122010-10-27 16:21:54 +00001867 return llvm::GlobalVariable::ExternalLinkage;
1868}
1869
John McCalla923c972012-12-12 22:21:47 +00001870/// Replace the uses of a function that was declared with a non-proto type.
1871/// We want to silently drop extra arguments from call sites
1872static void replaceUsesOfNonProtoConstant(llvm::Constant *old,
1873 llvm::Function *newFn) {
1874 // Fast path.
1875 if (old->use_empty()) return;
1876
1877 llvm::Type *newRetTy = newFn->getReturnType();
1878 SmallVector<llvm::Value*, 4> newArgs;
1879
1880 for (llvm::Value::use_iterator ui = old->use_begin(), ue = old->use_end();
1881 ui != ue; ) {
1882 llvm::Value::use_iterator use = ui++; // Increment before the use is erased.
1883 llvm::User *user = *use;
1884
1885 // Recognize and replace uses of bitcasts. Most calls to
1886 // unprototyped functions will use bitcasts.
1887 if (llvm::ConstantExpr *bitcast = dyn_cast<llvm::ConstantExpr>(user)) {
1888 if (bitcast->getOpcode() == llvm::Instruction::BitCast)
1889 replaceUsesOfNonProtoConstant(bitcast, newFn);
1890 continue;
1891 }
1892
1893 // Recognize calls to the function.
1894 llvm::CallSite callSite(user);
1895 if (!callSite) continue;
1896 if (!callSite.isCallee(use)) continue;
1897
1898 // If the return types don't match exactly, then we can't
1899 // transform this call unless it's dead.
1900 if (callSite->getType() != newRetTy && !callSite->use_empty())
1901 continue;
1902
1903 // Get the call site's attribute list.
Bill Wendlingb263bdf2013-01-27 02:46:53 +00001904 SmallVector<llvm::AttributeSet, 8> newAttrs;
John McCalla923c972012-12-12 22:21:47 +00001905 llvm::AttributeSet oldAttrs = callSite.getAttributes();
1906
1907 // Collect any return attributes from the call.
Bill Wendlinga37ce612013-01-21 21:57:40 +00001908 if (oldAttrs.hasAttributes(llvm::AttributeSet::ReturnIndex))
Bill Wendlinged01f842013-01-21 22:45:00 +00001909 newAttrs.push_back(
Bill Wendlingb263bdf2013-01-27 02:46:53 +00001910 llvm::AttributeSet::get(newFn->getContext(),
1911 oldAttrs.getRetAttributes()));
John McCalla923c972012-12-12 22:21:47 +00001912
1913 // If the function was passed too few arguments, don't transform.
1914 unsigned newNumArgs = newFn->arg_size();
1915 if (callSite.arg_size() < newNumArgs) continue;
1916
1917 // If extra arguments were passed, we silently drop them.
1918 // If any of the types mismatch, we don't transform.
1919 unsigned argNo = 0;
1920 bool dontTransform = false;
1921 for (llvm::Function::arg_iterator ai = newFn->arg_begin(),
1922 ae = newFn->arg_end(); ai != ae; ++ai, ++argNo) {
1923 if (callSite.getArgument(argNo)->getType() != ai->getType()) {
1924 dontTransform = true;
1925 break;
1926 }
1927
1928 // Add any parameter attributes.
Bill Wendling89530e42013-01-23 06:15:10 +00001929 if (oldAttrs.hasAttributes(argNo + 1))
1930 newAttrs.
Bill Wendlingb263bdf2013-01-27 02:46:53 +00001931 push_back(llvm::
1932 AttributeSet::get(newFn->getContext(),
1933 oldAttrs.getParamAttributes(argNo + 1)));
John McCalla923c972012-12-12 22:21:47 +00001934 }
1935 if (dontTransform)
1936 continue;
1937
Bill Wendlinge67e4c92013-01-18 21:26:07 +00001938 if (oldAttrs.hasAttributes(llvm::AttributeSet::FunctionIndex))
Bill Wendlingb263bdf2013-01-27 02:46:53 +00001939 newAttrs.push_back(llvm::AttributeSet::get(newFn->getContext(),
1940 oldAttrs.getFnAttributes()));
John McCalla923c972012-12-12 22:21:47 +00001941
1942 // Okay, we can transform this. Create the new call instruction and copy
1943 // over the required information.
1944 newArgs.append(callSite.arg_begin(), callSite.arg_begin() + argNo);
1945
1946 llvm::CallSite newCall;
1947 if (callSite.isCall()) {
1948 newCall = llvm::CallInst::Create(newFn, newArgs, "",
1949 callSite.getInstruction());
1950 } else {
1951 llvm::InvokeInst *oldInvoke =
1952 cast<llvm::InvokeInst>(callSite.getInstruction());
1953 newCall = llvm::InvokeInst::Create(newFn,
1954 oldInvoke->getNormalDest(),
1955 oldInvoke->getUnwindDest(),
1956 newArgs, "",
1957 callSite.getInstruction());
1958 }
1959 newArgs.clear(); // for the next iteration
1960
1961 if (!newCall->getType()->isVoidTy())
1962 newCall->takeName(callSite.getInstruction());
1963 newCall.setAttributes(
1964 llvm::AttributeSet::get(newFn->getContext(), newAttrs));
1965 newCall.setCallingConv(callSite.getCallingConv());
1966
1967 // Finally, remove the old call, replacing any uses with the new one.
1968 if (!callSite->use_empty())
1969 callSite->replaceAllUsesWith(newCall.getInstruction());
1970
1971 // Copy debug location attached to CI.
1972 if (!callSite->getDebugLoc().isUnknown())
1973 newCall->setDebugLoc(callSite->getDebugLoc());
1974 callSite->eraseFromParent();
1975 }
1976}
1977
Chris Lattnerbdb01322009-05-05 06:16:31 +00001978/// ReplaceUsesOfNonProtoTypeWithRealFunction - This function is called when we
1979/// implement a function with no prototype, e.g. "int foo() {}". If there are
1980/// existing call uses of the old function in the module, this adjusts them to
1981/// call the new function directly.
1982///
1983/// This is not just a cleanup: the always_inline pass requires direct calls to
1984/// functions to be able to inline them. If there is a bitcast in the way, it
1985/// won't inline them. Instcombine normally deletes these calls, but it isn't
1986/// run at -O0.
1987static void ReplaceUsesOfNonProtoTypeWithRealFunction(llvm::GlobalValue *Old,
1988 llvm::Function *NewFn) {
1989 // If we're redefining a global as a function, don't transform it.
John McCalla923c972012-12-12 22:21:47 +00001990 if (!isa<llvm::Function>(Old)) return;
Mike Stump1eb44332009-09-09 15:08:12 +00001991
John McCalla923c972012-12-12 22:21:47 +00001992 replaceUsesOfNonProtoConstant(Old, NewFn);
Chris Lattnerbdb01322009-05-05 06:16:31 +00001993}
1994
Rafael Espindola02503932012-03-08 15:51:03 +00001995void CodeGenModule::HandleCXXStaticMemberVarInstantiation(VarDecl *VD) {
1996 TemplateSpecializationKind TSK = VD->getTemplateSpecializationKind();
1997 // If we have a definition, this might be a deferred decl. If the
1998 // instantiation is explicit, make sure we emit it at the end.
1999 if (VD->getDefinition() && TSK == TSK_ExplicitInstantiationDefinition)
2000 GetAddrOfGlobalVar(VD);
Argyrios Kyrtzidisafda9052013-02-24 00:05:01 +00002001
2002 EmitTopLevelDecl(VD);
Rafael Espindola234fe652012-03-05 10:54:55 +00002003}
Daniel Dunbarbd012ff2008-07-29 23:18:29 +00002004
Chris Lattnerb4880ba2009-05-12 21:21:08 +00002005void CodeGenModule::EmitGlobalFunctionDefinition(GlobalDecl GD) {
Chris Lattnerb4880ba2009-05-12 21:21:08 +00002006 const FunctionDecl *D = cast<FunctionDecl>(GD.getDecl());
John McCalld26bc762011-03-09 04:27:21 +00002007
John McCall1f6f9612011-03-09 08:12:35 +00002008 // Compute the function info and LLVM type.
John McCallde5d3c72012-02-17 03:33:10 +00002009 const CGFunctionInfo &FI = getTypes().arrangeGlobalDeclaration(GD);
2010 llvm::FunctionType *Ty = getTypes().GetFunctionType(FI);
John McCalld26bc762011-03-09 04:27:21 +00002011
Chris Lattner9fa959d2009-05-12 20:58:15 +00002012 // Get or create the prototype for the function.
Chris Lattnerb4880ba2009-05-12 21:21:08 +00002013 llvm::Constant *Entry = GetAddrOfFunction(GD, Ty);
Mike Stump1eb44332009-09-09 15:08:12 +00002014
Chris Lattner0558e792009-03-21 09:25:43 +00002015 // Strip off a bitcast if we got one back.
2016 if (llvm::ConstantExpr *CE = dyn_cast<llvm::ConstantExpr>(Entry)) {
2017 assert(CE->getOpcode() == llvm::Instruction::BitCast);
2018 Entry = CE->getOperand(0);
2019 }
Mike Stump1eb44332009-09-09 15:08:12 +00002020
2021
Chris Lattner0558e792009-03-21 09:25:43 +00002022 if (cast<llvm::GlobalValue>(Entry)->getType()->getElementType() != Ty) {
Chris Lattnerbdb01322009-05-05 06:16:31 +00002023 llvm::GlobalValue *OldFn = cast<llvm::GlobalValue>(Entry);
Mike Stump1eb44332009-09-09 15:08:12 +00002024
Daniel Dunbar42745812009-03-09 23:53:08 +00002025 // If the types mismatch then we have to rewrite the definition.
Chris Lattnerbdb01322009-05-05 06:16:31 +00002026 assert(OldFn->isDeclaration() &&
Chris Lattner0558e792009-03-21 09:25:43 +00002027 "Shouldn't replace non-declaration");
Chris Lattner34809502009-03-21 08:53:37 +00002028
Chris Lattner62b33ea2009-03-21 08:38:50 +00002029 // F is the Function* for the one with the wrong type, we must make a new
2030 // Function* and update everything that used F (a declaration) with the new
2031 // Function* (which will be a definition).
2032 //
2033 // This happens if there is a prototype for a function
2034 // (e.g. "int f()") and then a definition of a different type
John McCallf746aa62010-03-19 23:29:14 +00002035 // (e.g. "int f(int x)"). Move the old function aside so that it
2036 // doesn't interfere with GetAddrOfFunction.
Chris Lattner5f9e2722011-07-23 10:55:15 +00002037 OldFn->setName(StringRef());
Chris Lattnerb4880ba2009-05-12 21:21:08 +00002038 llvm::Function *NewFn = cast<llvm::Function>(GetAddrOfFunction(GD, Ty));
Mike Stump1eb44332009-09-09 15:08:12 +00002039
John McCalla923c972012-12-12 22:21:47 +00002040 // This might be an implementation of a function without a
2041 // prototype, in which case, try to do special replacement of
2042 // calls which match the new prototype. The really key thing here
2043 // is that we also potentially drop arguments from the call site
2044 // so as to make a direct call, which makes the inliner happier
2045 // and suppresses a number of optimizer warnings (!) about
2046 // dropping arguments.
2047 if (!OldFn->use_empty()) {
Chris Lattnerbdb01322009-05-05 06:16:31 +00002048 ReplaceUsesOfNonProtoTypeWithRealFunction(OldFn, NewFn);
Chris Lattner9fa959d2009-05-12 20:58:15 +00002049 OldFn->removeDeadConstantUsers();
2050 }
Mike Stump1eb44332009-09-09 15:08:12 +00002051
Chris Lattner62b33ea2009-03-21 08:38:50 +00002052 // Replace uses of F with the Function we will endow with a body.
Chris Lattnerbdb01322009-05-05 06:16:31 +00002053 if (!Entry->use_empty()) {
Mike Stump1eb44332009-09-09 15:08:12 +00002054 llvm::Constant *NewPtrForOldDecl =
Owen Anderson3c4972d2009-07-29 18:54:39 +00002055 llvm::ConstantExpr::getBitCast(NewFn, Entry->getType());
Chris Lattnerbdb01322009-05-05 06:16:31 +00002056 Entry->replaceAllUsesWith(NewPtrForOldDecl);
2057 }
Mike Stump1eb44332009-09-09 15:08:12 +00002058
Chris Lattner62b33ea2009-03-21 08:38:50 +00002059 // Ok, delete the old function now, which is dead.
Chris Lattnerbdb01322009-05-05 06:16:31 +00002060 OldFn->eraseFromParent();
Mike Stump1eb44332009-09-09 15:08:12 +00002061
Chris Lattner0558e792009-03-21 09:25:43 +00002062 Entry = NewFn;
Daniel Dunbarbd012ff2008-07-29 23:18:29 +00002063 }
Mike Stump1eb44332009-09-09 15:08:12 +00002064
John McCall112c9672010-11-02 21:04:24 +00002065 // We need to set linkage and visibility on the function before
2066 // generating code for it because various parts of IR generation
2067 // want to propagate this information down (e.g. to local static
2068 // declarations).
Chris Lattner0558e792009-03-21 09:25:43 +00002069 llvm::Function *Fn = cast<llvm::Function>(Entry);
Peter Collingbourne144a31f2013-06-05 17:49:37 +00002070 setFunctionLinkage(GD, Fn);
Daniel Dunbarbd012ff2008-07-29 23:18:29 +00002071
John McCall112c9672010-11-02 21:04:24 +00002072 // FIXME: this is redundant with part of SetFunctionDefinitionAttributes
Anders Carlsson0ffeaad2011-01-29 19:39:23 +00002073 setGlobalVisibility(Fn, D);
John McCall112c9672010-11-02 21:04:24 +00002074
Richard Smith00249372013-04-06 05:00:46 +00002075 MaybeHandleStaticInExternC(D, Fn);
2076
John McCalld26bc762011-03-09 04:27:21 +00002077 CodeGenFunction(*this).GenerateCode(D, Fn, FI);
Daniel Dunbar6bfed7e2008-08-01 00:01:51 +00002078
Daniel Dunbar7c65e992009-04-14 08:05:55 +00002079 SetFunctionDefinitionAttributes(D, Fn);
2080 SetLLVMFunctionAttributesForDefinition(D, Fn);
Mike Stump1eb44332009-09-09 15:08:12 +00002081
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +00002082 if (const ConstructorAttr *CA = D->getAttr<ConstructorAttr>())
Daniel Dunbar219df662008-09-08 23:44:31 +00002083 AddGlobalCtor(Fn, CA->getPriority());
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +00002084 if (const DestructorAttr *DA = D->getAttr<DestructorAttr>())
Daniel Dunbar219df662008-09-08 23:44:31 +00002085 AddGlobalDtor(Fn, DA->getPriority());
Julien Lerouge77f68bb2011-09-09 22:41:49 +00002086 if (D->hasAttr<AnnotateAttr>())
2087 AddGlobalAnnotations(D, Fn);
Daniel Dunbarbd012ff2008-07-29 23:18:29 +00002088}
2089
John McCallf746aa62010-03-19 23:29:14 +00002090void CodeGenModule::EmitAliasDefinition(GlobalDecl GD) {
2091 const ValueDecl *D = cast<ValueDecl>(GD.getDecl());
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +00002092 const AliasAttr *AA = D->getAttr<AliasAttr>();
Chris Lattnerbd532712009-03-22 21:47:11 +00002093 assert(AA && "Not an alias?");
2094
Chris Lattner5f9e2722011-07-23 10:55:15 +00002095 StringRef MangledName = getMangledName(GD);
Mike Stump1eb44332009-09-09 15:08:12 +00002096
John McCallf746aa62010-03-19 23:29:14 +00002097 // If there is a definition in the module, then it wins over the alias.
2098 // This is dubious, but allow it to be safe. Just ignore the alias.
2099 llvm::GlobalValue *Entry = GetGlobalValue(MangledName);
2100 if (Entry && !Entry->isDeclaration())
2101 return;
2102
Chris Lattner2acc6e32011-07-18 04:24:23 +00002103 llvm::Type *DeclTy = getTypes().ConvertTypeForMem(D->getType());
Chris Lattnerbd532712009-03-22 21:47:11 +00002104
2105 // Create a reference to the named value. This ensures that it is emitted
2106 // if a deferred decl.
2107 llvm::Constant *Aliasee;
2108 if (isa<llvm::FunctionType>(DeclTy))
Alex Rosenbergc857ce82012-10-05 23:12:53 +00002109 Aliasee = GetOrCreateLLVMFunction(AA->getAliasee(), DeclTy, GD,
Anders Carlsson1faa89f2011-02-05 04:35:53 +00002110 /*ForVTable=*/false);
Chris Lattnerbd532712009-03-22 21:47:11 +00002111 else
John McCallf746aa62010-03-19 23:29:14 +00002112 Aliasee = GetOrCreateLLVMGlobal(AA->getAliasee(),
Owen Anderson96e0fc72009-07-29 22:16:19 +00002113 llvm::PointerType::getUnqual(DeclTy), 0);
Chris Lattnerbd532712009-03-22 21:47:11 +00002114
2115 // Create the new alias itself, but don't set a name yet.
Mike Stump1eb44332009-09-09 15:08:12 +00002116 llvm::GlobalValue *GA =
Chris Lattnerbd532712009-03-22 21:47:11 +00002117 new llvm::GlobalAlias(Aliasee->getType(),
2118 llvm::Function::ExternalLinkage,
2119 "", Aliasee, &getModule());
Mike Stump1eb44332009-09-09 15:08:12 +00002120
Chris Lattnerbd532712009-03-22 21:47:11 +00002121 if (Entry) {
John McCallf746aa62010-03-19 23:29:14 +00002122 assert(Entry->isDeclaration());
2123
Chris Lattnerbd532712009-03-22 21:47:11 +00002124 // If there is a declaration in the module, then we had an extern followed
2125 // by the alias, as in:
2126 // extern int test6();
2127 // ...
2128 // int test6() __attribute__((alias("test7")));
2129 //
2130 // Remove it and replace uses of it with the alias.
John McCallf746aa62010-03-19 23:29:14 +00002131 GA->takeName(Entry);
Mike Stump1eb44332009-09-09 15:08:12 +00002132
Owen Anderson3c4972d2009-07-29 18:54:39 +00002133 Entry->replaceAllUsesWith(llvm::ConstantExpr::getBitCast(GA,
Chris Lattnerbd532712009-03-22 21:47:11 +00002134 Entry->getType()));
Chris Lattnerbd532712009-03-22 21:47:11 +00002135 Entry->eraseFromParent();
John McCallf746aa62010-03-19 23:29:14 +00002136 } else {
Anders Carlsson9a20d552010-06-22 16:16:50 +00002137 GA->setName(MangledName);
Chris Lattnerbd532712009-03-22 21:47:11 +00002138 }
Mike Stump1eb44332009-09-09 15:08:12 +00002139
Daniel Dunbar7c65e992009-04-14 08:05:55 +00002140 // Set attributes which are particular to an alias; this is a
2141 // specialization of the attributes which may be set on a global
2142 // variable/function.
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +00002143 if (D->hasAttr<DLLExportAttr>()) {
Daniel Dunbar7c65e992009-04-14 08:05:55 +00002144 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
2145 // The dllexport attribute is ignored for undefined symbols.
Argyrios Kyrtzidis06a54a32010-07-07 11:31:19 +00002146 if (FD->hasBody())
Daniel Dunbar7c65e992009-04-14 08:05:55 +00002147 GA->setLinkage(llvm::Function::DLLExportLinkage);
2148 } else {
2149 GA->setLinkage(llvm::Function::DLLExportLinkage);
2150 }
Mike Stump1eb44332009-09-09 15:08:12 +00002151 } else if (D->hasAttr<WeakAttr>() ||
Rafael Espindola11e8ce72010-02-23 22:00:30 +00002152 D->hasAttr<WeakRefAttr>() ||
Douglas Gregor0a0d2b12011-03-23 00:50:03 +00002153 D->isWeakImported()) {
Daniel Dunbar7c65e992009-04-14 08:05:55 +00002154 GA->setLinkage(llvm::Function::WeakAnyLinkage);
2155 }
2156
2157 SetCommonAttributes(D, GA);
Chris Lattnerbd532712009-03-22 21:47:11 +00002158}
2159
Benjamin Kramer8dd55a32011-07-14 17:45:50 +00002160llvm::Function *CodeGenModule::getIntrinsic(unsigned IID,
Chris Lattner2d3ba4f2011-07-23 17:14:25 +00002161 ArrayRef<llvm::Type*> Tys) {
Jay Foaddf983a82011-07-12 14:06:48 +00002162 return llvm::Intrinsic::getDeclaration(&getModule(), (llvm::Intrinsic::ID)IID,
Benjamin Kramer8dd55a32011-07-14 17:45:50 +00002163 Tys);
Chris Lattner7acda7c2007-12-18 00:25:38 +00002164}
Chris Lattnerbef20ac2007-08-31 04:31:45 +00002165
Daniel Dunbar1d552912009-07-23 22:52:48 +00002166static llvm::StringMapEntry<llvm::Constant*> &
2167GetConstantCFStringEntry(llvm::StringMap<llvm::Constant*> &Map,
2168 const StringLiteral *Literal,
Daniel Dunbar70ee9752009-07-23 23:41:22 +00002169 bool TargetIsLSB,
Daniel Dunbar1d552912009-07-23 22:52:48 +00002170 bool &IsUTF16,
2171 unsigned &StringLength) {
Chris Lattner5f9e2722011-07-23 10:55:15 +00002172 StringRef String = Literal->getString();
Benjamin Kramer2f4eaef2010-08-17 12:54:38 +00002173 unsigned NumBytes = String.size();
Daniel Dunbar1d552912009-07-23 22:52:48 +00002174
Daniel Dunbarf015b032009-09-22 10:03:52 +00002175 // Check for simple case.
2176 if (!Literal->containsNonAsciiOrNull()) {
2177 StringLength = NumBytes;
Benjamin Kramer2f4eaef2010-08-17 12:54:38 +00002178 return Map.GetOrCreateValue(String);
Daniel Dunbarf015b032009-09-22 10:03:52 +00002179 }
2180
Bill Wendling84392d02012-03-30 00:26:17 +00002181 // Otherwise, convert the UTF8 literals into a string of shorts.
2182 IsUTF16 = true;
2183
2184 SmallVector<UTF16, 128> ToBuf(NumBytes + 1); // +1 for ending nulls.
Roman Divacky31ba6132012-09-06 15:59:27 +00002185 const UTF8 *FromPtr = (const UTF8 *)String.data();
Daniel Dunbar1d552912009-07-23 22:52:48 +00002186 UTF16 *ToPtr = &ToBuf[0];
Mike Stump1eb44332009-09-09 15:08:12 +00002187
Fariborz Jahaniane7ddfb92010-09-07 19:57:04 +00002188 (void)ConvertUTF8toUTF16(&FromPtr, FromPtr + NumBytes,
2189 &ToPtr, ToPtr + NumBytes,
2190 strictConversion);
Mike Stump1eb44332009-09-09 15:08:12 +00002191
Daniel Dunbar70ee9752009-07-23 23:41:22 +00002192 // ConvertUTF8toUTF16 returns the length in ToPtr.
Daniel Dunbar1d552912009-07-23 22:52:48 +00002193 StringLength = ToPtr - &ToBuf[0];
Daniel Dunbar70ee9752009-07-23 23:41:22 +00002194
Bill Wendling84392d02012-03-30 00:26:17 +00002195 // Add an explicit null.
2196 *ToPtr = 0;
2197 return Map.
2198 GetOrCreateValue(StringRef(reinterpret_cast<const char *>(ToBuf.data()),
2199 (StringLength + 1) * 2));
Daniel Dunbar1d552912009-07-23 22:52:48 +00002200}
2201
Fariborz Jahaniancf8e1682011-05-13 18:13:10 +00002202static llvm::StringMapEntry<llvm::Constant*> &
2203GetConstantStringEntry(llvm::StringMap<llvm::Constant*> &Map,
Bill Wendling8322c232012-03-29 22:12:09 +00002204 const StringLiteral *Literal,
2205 unsigned &StringLength) {
2206 StringRef String = Literal->getString();
2207 StringLength = String.size();
2208 return Map.GetOrCreateValue(String);
Fariborz Jahaniancf8e1682011-05-13 18:13:10 +00002209}
2210
Daniel Dunbar1d552912009-07-23 22:52:48 +00002211llvm::Constant *
2212CodeGenModule::GetAddrOfConstantCFString(const StringLiteral *Literal) {
2213 unsigned StringLength = 0;
2214 bool isUTF16 = false;
2215 llvm::StringMapEntry<llvm::Constant*> &Entry =
Mike Stump1eb44332009-09-09 15:08:12 +00002216 GetConstantCFStringEntry(CFConstantStringMap, Literal,
Micah Villmow25a6a842012-10-08 16:25:52 +00002217 getDataLayout().isLittleEndian(),
Daniel Dunbar70ee9752009-07-23 23:41:22 +00002218 isUTF16, StringLength);
Mike Stump1eb44332009-09-09 15:08:12 +00002219
Daniel Dunbar1d552912009-07-23 22:52:48 +00002220 if (llvm::Constant *C = Entry.getValue())
2221 return C;
Mike Stump1eb44332009-09-09 15:08:12 +00002222
Chris Lattner8b418682012-02-07 00:39:47 +00002223 llvm::Constant *Zero = llvm::Constant::getNullValue(Int32Ty);
Daniel Dunbar3e9df992008-08-23 18:37:06 +00002224 llvm::Constant *Zeros[] = { Zero, Zero };
Fariborz Jahanian428edb72013-04-16 15:25:39 +00002225 llvm::Value *V;
2226
Chris Lattner9d4a15f2009-07-16 16:48:25 +00002227 // If we don't already have it, get __CFConstantStringClassReference.
Anders Carlssonc9e20912007-08-21 00:21:21 +00002228 if (!CFConstantStringClassRef) {
Chris Lattner2acc6e32011-07-18 04:24:23 +00002229 llvm::Type *Ty = getTypes().ConvertType(getContext().IntTy);
Owen Anderson96e0fc72009-07-29 22:16:19 +00002230 Ty = llvm::ArrayType::get(Ty, 0);
Mike Stump1eb44332009-09-09 15:08:12 +00002231 llvm::Constant *GV = CreateRuntimeVariable(Ty,
Chris Lattner9d4a15f2009-07-16 16:48:25 +00002232 "__CFConstantStringClassReference");
Daniel Dunbar3e9df992008-08-23 18:37:06 +00002233 // Decay array -> ptr
Fariborz Jahanian428edb72013-04-16 15:25:39 +00002234 V = llvm::ConstantExpr::getGetElementPtr(GV, Zeros);
2235 CFConstantStringClassRef = V;
Anders Carlssonc9e20912007-08-21 00:21:21 +00002236 }
Fariborz Jahanian428edb72013-04-16 15:25:39 +00002237 else
2238 V = CFConstantStringClassRef;
Mike Stump1eb44332009-09-09 15:08:12 +00002239
Anders Carlssone3daa762008-11-15 18:54:24 +00002240 QualType CFTy = getContext().getCFConstantStringType();
Daniel Dunbar3e9df992008-08-23 18:37:06 +00002241
Chris Lattner2acc6e32011-07-18 04:24:23 +00002242 llvm::StructType *STy =
Anders Carlssone3daa762008-11-15 18:54:24 +00002243 cast<llvm::StructType>(getTypes().ConvertType(CFTy));
2244
Benjamin Kramer1d236ab2011-10-15 12:20:02 +00002245 llvm::Constant *Fields[4];
Douglas Gregor44b43212008-12-11 16:49:14 +00002246
Anders Carlssonc9e20912007-08-21 00:21:21 +00002247 // Class pointer.
Fariborz Jahanian428edb72013-04-16 15:25:39 +00002248 Fields[0] = cast<llvm::ConstantExpr>(V);
Mike Stump1eb44332009-09-09 15:08:12 +00002249
Anders Carlssonc9e20912007-08-21 00:21:21 +00002250 // Flags.
Chris Lattner2acc6e32011-07-18 04:24:23 +00002251 llvm::Type *Ty = getTypes().ConvertType(getContext().UnsignedIntTy);
Mike Stump1eb44332009-09-09 15:08:12 +00002252 Fields[1] = isUTF16 ? llvm::ConstantInt::get(Ty, 0x07d0) :
Anders Carlsson5add6832009-08-16 05:55:31 +00002253 llvm::ConstantInt::get(Ty, 0x07C8);
2254
Anders Carlssonc9e20912007-08-21 00:21:21 +00002255 // String pointer.
Bill Wendling84392d02012-03-30 00:26:17 +00002256 llvm::Constant *C = 0;
2257 if (isUTF16) {
2258 ArrayRef<uint16_t> Arr =
David Greene5ba58a12013-01-15 22:09:41 +00002259 llvm::makeArrayRef<uint16_t>(reinterpret_cast<uint16_t*>(
2260 const_cast<char *>(Entry.getKey().data())),
Bill Wendling84392d02012-03-30 00:26:17 +00002261 Entry.getKey().size() / 2);
2262 C = llvm::ConstantDataArray::get(VMContext, Arr);
2263 } else {
2264 C = llvm::ConstantDataArray::getString(VMContext, Entry.getKey());
2265 }
Daniel Dunbara9668e02009-04-03 00:57:44 +00002266
Chris Lattner95b851e2009-07-16 05:03:48 +00002267 llvm::GlobalValue::LinkageTypes Linkage;
Bill Wendling1bf7a3f2012-01-10 08:46:39 +00002268 if (isUTF16)
Chris Lattner278b9f02009-10-14 05:55:45 +00002269 // FIXME: why do utf strings get "_" labels instead of "L" labels?
Chris Lattner95b851e2009-07-16 05:03:48 +00002270 Linkage = llvm::GlobalValue::InternalLinkage;
Bill Wendling1bf7a3f2012-01-10 08:46:39 +00002271 else
Rafael Espindola584acf22011-03-14 17:55:00 +00002272 // FIXME: With OS X ld 123.2 (xcode 4) and LTO we would get a linker error
2273 // when using private linkage. It is not clear if this is a bug in ld
2274 // or a reasonable new restriction.
Rafael Espindoladc0f1372011-03-14 21:08:19 +00002275 Linkage = llvm::GlobalValue::LinkerPrivateLinkage;
Chris Lattner278b9f02009-10-14 05:55:45 +00002276
Bill Wendling1bf7a3f2012-01-10 08:46:39 +00002277 // Note: -fwritable-strings doesn't make the backing store strings of
2278 // CFStrings writable. (See <rdar://problem/10657500>)
Mike Stump1eb44332009-09-09 15:08:12 +00002279 llvm::GlobalVariable *GV =
Bill Wendling1bf7a3f2012-01-10 08:46:39 +00002280 new llvm::GlobalVariable(getModule(), C->getType(), /*isConstant=*/true,
2281 Linkage, C, ".str");
Rafael Espindolab266a1f2011-01-17 16:31:00 +00002282 GV->setUnnamedAddr(true);
Ulrich Weigand6b203512013-05-06 16:23:57 +00002283 // Don't enforce the target's minimum global alignment, since the only use
2284 // of the string is via this class initializer.
Daniel Dunbara9668e02009-04-03 00:57:44 +00002285 if (isUTF16) {
Ken Dyck4da244c2010-01-26 18:46:23 +00002286 CharUnits Align = getContext().getTypeAlignInChars(getContext().ShortTy);
2287 GV->setAlignment(Align.getQuantity());
Daniel Dunbarf7e903d2011-04-12 23:30:52 +00002288 } else {
2289 CharUnits Align = getContext().getTypeAlignInChars(getContext().CharTy);
2290 GV->setAlignment(Align.getQuantity());
Daniel Dunbara9668e02009-04-03 00:57:44 +00002291 }
Bill Wendling84392d02012-03-30 00:26:17 +00002292
2293 // String.
Jay Foada5c04342011-07-21 14:31:17 +00002294 Fields[2] = llvm::ConstantExpr::getGetElementPtr(GV, Zeros);
Anders Carlsson5add6832009-08-16 05:55:31 +00002295
Bill Wendling84392d02012-03-30 00:26:17 +00002296 if (isUTF16)
2297 // Cast the UTF16 string to the correct type.
2298 Fields[2] = llvm::ConstantExpr::getBitCast(Fields[2], Int8PtrTy);
2299
Anders Carlssonc9e20912007-08-21 00:21:21 +00002300 // String length.
2301 Ty = getTypes().ConvertType(getContext().LongTy);
Anders Carlsson5add6832009-08-16 05:55:31 +00002302 Fields[3] = llvm::ConstantInt::get(Ty, StringLength);
Mike Stump1eb44332009-09-09 15:08:12 +00002303
Anders Carlssonc9e20912007-08-21 00:21:21 +00002304 // The struct.
Owen Anderson08e25242009-07-27 22:29:56 +00002305 C = llvm::ConstantStruct::get(STy, Fields);
Mike Stump1eb44332009-09-09 15:08:12 +00002306 GV = new llvm::GlobalVariable(getModule(), C->getType(), true,
2307 llvm::GlobalVariable::PrivateLinkage, C,
Chris Lattner95b851e2009-07-16 05:03:48 +00002308 "_unnamed_cfstring_");
John McCall64aa4b32013-04-16 22:48:15 +00002309 if (const char *Sect = getTarget().getCFStringSection())
Daniel Dunbar8e5c2b82009-03-31 23:42:16 +00002310 GV->setSection(Sect);
Daniel Dunbar1d552912009-07-23 22:52:48 +00002311 Entry.setValue(GV);
Mike Stump1eb44332009-09-09 15:08:12 +00002312
Anders Carlsson0c678292007-11-01 00:41:52 +00002313 return GV;
Anders Carlssonc9e20912007-08-21 00:21:21 +00002314}
Chris Lattner45e8cbd2007-11-28 05:34:05 +00002315
Douglas Gregor45c4ea72011-08-09 15:54:21 +00002316static RecordDecl *
2317CreateRecordDecl(const ASTContext &Ctx, RecordDecl::TagKind TK,
2318 DeclContext *DC, IdentifierInfo *Id) {
2319 SourceLocation Loc;
David Blaikie4e4d0842012-03-11 07:00:24 +00002320 if (Ctx.getLangOpts().CPlusPlus)
Douglas Gregor45c4ea72011-08-09 15:54:21 +00002321 return CXXRecordDecl::Create(Ctx, TK, DC, Loc, Loc, Id);
2322 else
2323 return RecordDecl::Create(Ctx, TK, DC, Loc, Loc, Id);
2324}
2325
Fariborz Jahanian33e982b2010-04-22 20:26:39 +00002326llvm::Constant *
Fariborz Jahanian4c733072010-10-19 17:19:29 +00002327CodeGenModule::GetAddrOfConstantString(const StringLiteral *Literal) {
Fariborz Jahanian2bb5dda2010-04-23 17:41:07 +00002328 unsigned StringLength = 0;
Fariborz Jahanian2bb5dda2010-04-23 17:41:07 +00002329 llvm::StringMapEntry<llvm::Constant*> &Entry =
Fariborz Jahaniancf8e1682011-05-13 18:13:10 +00002330 GetConstantStringEntry(CFConstantStringMap, Literal, StringLength);
Fariborz Jahanian2bb5dda2010-04-23 17:41:07 +00002331
2332 if (llvm::Constant *C = Entry.getValue())
2333 return C;
2334
Chris Lattner812234b2012-02-06 22:47:00 +00002335 llvm::Constant *Zero = llvm::Constant::getNullValue(Int32Ty);
Fariborz Jahanian2bb5dda2010-04-23 17:41:07 +00002336 llvm::Constant *Zeros[] = { Zero, Zero };
Fariborz Jahanian428edb72013-04-16 15:25:39 +00002337 llvm::Value *V;
Fariborz Jahanianec951e02010-04-23 22:33:39 +00002338 // If we don't already have it, get _NSConstantStringClassReference.
Fariborz Jahanian4c733072010-10-19 17:19:29 +00002339 if (!ConstantStringClassRef) {
David Blaikie4e4d0842012-03-11 07:00:24 +00002340 std::string StringClass(getLangOpts().ObjCConstantStringClass);
Chris Lattner2acc6e32011-07-18 04:24:23 +00002341 llvm::Type *Ty = getTypes().ConvertType(getContext().IntTy);
Fariborz Jahanian4c733072010-10-19 17:19:29 +00002342 llvm::Constant *GV;
John McCall260611a2012-06-20 06:18:46 +00002343 if (LangOpts.ObjCRuntime.isNonFragile()) {
Fariborz Jahanian25dba5d2011-05-17 22:46:11 +00002344 std::string str =
2345 StringClass.empty() ? "OBJC_CLASS_$_NSConstantString"
2346 : "OBJC_CLASS_$_" + StringClass;
Fariborz Jahanian6f40e222011-05-17 22:21:16 +00002347 GV = getObjCRuntime().GetClassGlobal(str);
2348 // Make sure the result is of the correct type.
Chris Lattner2acc6e32011-07-18 04:24:23 +00002349 llvm::Type *PTy = llvm::PointerType::getUnqual(Ty);
Fariborz Jahanian428edb72013-04-16 15:25:39 +00002350 V = llvm::ConstantExpr::getBitCast(GV, PTy);
2351 ConstantStringClassRef = V;
Fariborz Jahanian6f40e222011-05-17 22:21:16 +00002352 } else {
Fariborz Jahanian25dba5d2011-05-17 22:46:11 +00002353 std::string str =
2354 StringClass.empty() ? "_NSConstantStringClassReference"
2355 : "_" + StringClass + "ClassReference";
Chris Lattner2acc6e32011-07-18 04:24:23 +00002356 llvm::Type *PTy = llvm::ArrayType::get(Ty, 0);
Fariborz Jahanian25dba5d2011-05-17 22:46:11 +00002357 GV = CreateRuntimeVariable(PTy, str);
Fariborz Jahanian6f40e222011-05-17 22:21:16 +00002358 // Decay array -> ptr
Fariborz Jahanian428edb72013-04-16 15:25:39 +00002359 V = llvm::ConstantExpr::getGetElementPtr(GV, Zeros);
2360 ConstantStringClassRef = V;
Fariborz Jahanian4c733072010-10-19 17:19:29 +00002361 }
Fariborz Jahanian2bb5dda2010-04-23 17:41:07 +00002362 }
Fariborz Jahanian428edb72013-04-16 15:25:39 +00002363 else
2364 V = ConstantStringClassRef;
Douglas Gregor45c4ea72011-08-09 15:54:21 +00002365
2366 if (!NSConstantStringType) {
2367 // Construct the type for a constant NSString.
2368 RecordDecl *D = CreateRecordDecl(Context, TTK_Struct,
2369 Context.getTranslationUnitDecl(),
2370 &Context.Idents.get("__builtin_NSString"));
2371 D->startDefinition();
2372
2373 QualType FieldTypes[3];
2374
2375 // const int *isa;
2376 FieldTypes[0] = Context.getPointerType(Context.IntTy.withConst());
2377 // const char *str;
2378 FieldTypes[1] = Context.getPointerType(Context.CharTy.withConst());
2379 // unsigned int length;
2380 FieldTypes[2] = Context.UnsignedIntTy;
2381
2382 // Create fields
2383 for (unsigned i = 0; i < 3; ++i) {
2384 FieldDecl *Field = FieldDecl::Create(Context, D,
2385 SourceLocation(),
2386 SourceLocation(), 0,
2387 FieldTypes[i], /*TInfo=*/0,
2388 /*BitWidth=*/0,
2389 /*Mutable=*/false,
Richard Smithca523302012-06-10 03:12:00 +00002390 ICIS_NoInit);
Douglas Gregor45c4ea72011-08-09 15:54:21 +00002391 Field->setAccess(AS_public);
2392 D->addDecl(Field);
2393 }
2394
2395 D->completeDefinition();
2396 QualType NSTy = Context.getTagDeclType(D);
2397 NSConstantStringType = cast<llvm::StructType>(getTypes().ConvertType(NSTy));
2398 }
Fariborz Jahanian2bb5dda2010-04-23 17:41:07 +00002399
Benjamin Kramer1d236ab2011-10-15 12:20:02 +00002400 llvm::Constant *Fields[3];
Fariborz Jahanian2bb5dda2010-04-23 17:41:07 +00002401
2402 // Class pointer.
Fariborz Jahanian428edb72013-04-16 15:25:39 +00002403 Fields[0] = cast<llvm::ConstantExpr>(V);
Fariborz Jahanian2bb5dda2010-04-23 17:41:07 +00002404
2405 // String pointer.
Chris Lattner94010692012-02-05 02:30:40 +00002406 llvm::Constant *C =
2407 llvm::ConstantDataArray::getString(VMContext, Entry.getKey());
Fariborz Jahanian2bb5dda2010-04-23 17:41:07 +00002408
2409 llvm::GlobalValue::LinkageTypes Linkage;
2410 bool isConstant;
Fariborz Jahaniancf8e1682011-05-13 18:13:10 +00002411 Linkage = llvm::GlobalValue::PrivateLinkage;
David Blaikie4e4d0842012-03-11 07:00:24 +00002412 isConstant = !LangOpts.WritableStrings;
Fariborz Jahanian2bb5dda2010-04-23 17:41:07 +00002413
2414 llvm::GlobalVariable *GV =
2415 new llvm::GlobalVariable(getModule(), C->getType(), isConstant, Linkage, C,
2416 ".str");
Rafael Espindola803d3072011-01-17 22:11:21 +00002417 GV->setUnnamedAddr(true);
Ulrich Weigand6b203512013-05-06 16:23:57 +00002418 // Don't enforce the target's minimum global alignment, since the only use
2419 // of the string is via this class initializer.
Fariborz Jahaniancf8e1682011-05-13 18:13:10 +00002420 CharUnits Align = getContext().getTypeAlignInChars(getContext().CharTy);
2421 GV->setAlignment(Align.getQuantity());
Jay Foada5c04342011-07-21 14:31:17 +00002422 Fields[1] = llvm::ConstantExpr::getGetElementPtr(GV, Zeros);
Fariborz Jahanian2bb5dda2010-04-23 17:41:07 +00002423
2424 // String length.
Chris Lattner2acc6e32011-07-18 04:24:23 +00002425 llvm::Type *Ty = getTypes().ConvertType(getContext().UnsignedIntTy);
Fariborz Jahanian2bb5dda2010-04-23 17:41:07 +00002426 Fields[2] = llvm::ConstantInt::get(Ty, StringLength);
2427
2428 // The struct.
Douglas Gregor45c4ea72011-08-09 15:54:21 +00002429 C = llvm::ConstantStruct::get(NSConstantStringType, Fields);
Fariborz Jahanian2bb5dda2010-04-23 17:41:07 +00002430 GV = new llvm::GlobalVariable(getModule(), C->getType(), true,
2431 llvm::GlobalVariable::PrivateLinkage, C,
2432 "_unnamed_nsstring_");
2433 // FIXME. Fix section.
Fariborz Jahanianec951e02010-04-23 22:33:39 +00002434 if (const char *Sect =
John McCall260611a2012-06-20 06:18:46 +00002435 LangOpts.ObjCRuntime.isNonFragile()
John McCall64aa4b32013-04-16 22:48:15 +00002436 ? getTarget().getNSStringNonFragileABISection()
2437 : getTarget().getNSStringSection())
Fariborz Jahanian2bb5dda2010-04-23 17:41:07 +00002438 GV->setSection(Sect);
2439 Entry.setValue(GV);
2440
2441 return GV;
Fariborz Jahanian33e982b2010-04-22 20:26:39 +00002442}
2443
Douglas Gregor0815b572011-08-09 17:23:49 +00002444QualType CodeGenModule::getObjCFastEnumerationStateType() {
2445 if (ObjCFastEnumerationStateType.isNull()) {
2446 RecordDecl *D = CreateRecordDecl(Context, TTK_Struct,
2447 Context.getTranslationUnitDecl(),
2448 &Context.Idents.get("__objcFastEnumerationState"));
2449 D->startDefinition();
2450
2451 QualType FieldTypes[] = {
2452 Context.UnsignedLongTy,
2453 Context.getPointerType(Context.getObjCIdType()),
2454 Context.getPointerType(Context.UnsignedLongTy),
2455 Context.getConstantArrayType(Context.UnsignedLongTy,
2456 llvm::APInt(32, 5), ArrayType::Normal, 0)
2457 };
2458
2459 for (size_t i = 0; i < 4; ++i) {
2460 FieldDecl *Field = FieldDecl::Create(Context,
2461 D,
2462 SourceLocation(),
2463 SourceLocation(), 0,
2464 FieldTypes[i], /*TInfo=*/0,
2465 /*BitWidth=*/0,
2466 /*Mutable=*/false,
Richard Smithca523302012-06-10 03:12:00 +00002467 ICIS_NoInit);
Douglas Gregor0815b572011-08-09 17:23:49 +00002468 Field->setAccess(AS_public);
2469 D->addDecl(Field);
2470 }
2471
2472 D->completeDefinition();
2473 ObjCFastEnumerationStateType = Context.getTagDeclType(D);
2474 }
2475
2476 return ObjCFastEnumerationStateType;
2477}
2478
Eli Friedman64f45a22011-11-01 02:23:42 +00002479llvm::Constant *
2480CodeGenModule::GetConstantArrayFromStringLiteral(const StringLiteral *E) {
2481 assert(!E->getType()->isPointerType() && "Strings are always arrays");
2482
2483 // Don't emit it as the address of the string, emit the string data itself
2484 // as an inline array.
Chris Lattner812234b2012-02-06 22:47:00 +00002485 if (E->getCharByteWidth() == 1) {
2486 SmallString<64> Str(E->getString());
2487
2488 // Resize the string to the right size, which is indicated by its type.
2489 const ConstantArrayType *CAT = Context.getAsConstantArrayType(E->getType());
2490 Str.resize(CAT->getSize().getZExtValue());
2491 return llvm::ConstantDataArray::getString(VMContext, Str, false);
2492 }
Chris Lattner94010692012-02-05 02:30:40 +00002493
2494 llvm::ArrayType *AType =
2495 cast<llvm::ArrayType>(getTypes().ConvertType(E->getType()));
2496 llvm::Type *ElemTy = AType->getElementType();
2497 unsigned NumElements = AType->getNumElements();
Chris Lattnerd79ed432012-02-06 22:52:04 +00002498
2499 // Wide strings have either 2-byte or 4-byte elements.
2500 if (ElemTy->getPrimitiveSizeInBits() == 16) {
2501 SmallVector<uint16_t, 32> Elements;
2502 Elements.reserve(NumElements);
2503
2504 for(unsigned i = 0, e = E->getLength(); i != e; ++i)
2505 Elements.push_back(E->getCodeUnit(i));
2506 Elements.resize(NumElements);
2507 return llvm::ConstantDataArray::get(VMContext, Elements);
Chris Lattner94010692012-02-05 02:30:40 +00002508 }
2509
Chris Lattnerd79ed432012-02-06 22:52:04 +00002510 assert(ElemTy->getPrimitiveSizeInBits() == 32);
2511 SmallVector<uint32_t, 32> Elements;
2512 Elements.reserve(NumElements);
2513
2514 for(unsigned i = 0, e = E->getLength(); i != e; ++i)
2515 Elements.push_back(E->getCodeUnit(i));
2516 Elements.resize(NumElements);
2517 return llvm::ConstantDataArray::get(VMContext, Elements);
Eli Friedman64f45a22011-11-01 02:23:42 +00002518}
2519
Daniel Dunbar61432932008-08-13 23:20:05 +00002520/// GetAddrOfConstantStringFromLiteral - Return a pointer to a
2521/// constant array for the given string literal.
2522llvm::Constant *
2523CodeGenModule::GetAddrOfConstantStringFromLiteral(const StringLiteral *S) {
Ulrich Weigand6b203512013-05-06 16:23:57 +00002524 CharUnits Align = getContext().getAlignOfGlobalVarInChars(S->getType());
Eli Friedman64f45a22011-11-01 02:23:42 +00002525 if (S->isAscii() || S->isUTF8()) {
Chris Lattner812234b2012-02-06 22:47:00 +00002526 SmallString<64> Str(S->getString());
2527
2528 // Resize the string to the right size, which is indicated by its type.
2529 const ConstantArrayType *CAT = Context.getAsConstantArrayType(S->getType());
2530 Str.resize(CAT->getSize().getZExtValue());
2531 return GetAddrOfConstantString(Str, /*GlobalName*/ 0, Align.getQuantity());
Eli Friedman7eb79c12009-11-16 05:55:46 +00002532 }
Eli Friedman64f45a22011-11-01 02:23:42 +00002533
Chris Lattner812234b2012-02-06 22:47:00 +00002534 // FIXME: the following does not memoize wide strings.
Eli Friedman64f45a22011-11-01 02:23:42 +00002535 llvm::Constant *C = GetConstantArrayFromStringLiteral(S);
2536 llvm::GlobalVariable *GV =
2537 new llvm::GlobalVariable(getModule(),C->getType(),
David Blaikie4e4d0842012-03-11 07:00:24 +00002538 !LangOpts.WritableStrings,
Eli Friedman64f45a22011-11-01 02:23:42 +00002539 llvm::GlobalValue::PrivateLinkage,
2540 C,".str");
Seth Cantrell7d6a7c02012-01-18 12:11:32 +00002541
Eli Friedman64f45a22011-11-01 02:23:42 +00002542 GV->setAlignment(Align.getQuantity());
2543 GV->setUnnamedAddr(true);
Eli Friedman64f45a22011-11-01 02:23:42 +00002544 return GV;
Daniel Dunbar61432932008-08-13 23:20:05 +00002545}
2546
Chris Lattnereaf2bb82009-02-24 22:18:39 +00002547/// GetAddrOfConstantStringFromObjCEncode - Return a pointer to a constant
2548/// array for the given ObjCEncodeExpr node.
2549llvm::Constant *
2550CodeGenModule::GetAddrOfConstantStringFromObjCEncode(const ObjCEncodeExpr *E) {
2551 std::string Str;
2552 getContext().getObjCEncodingForType(E->getEncodedType(), Str);
Eli Friedmana210f352009-03-07 20:17:55 +00002553
2554 return GetAddrOfConstantCString(Str);
Chris Lattnereaf2bb82009-02-24 22:18:39 +00002555}
2556
2557
Chris Lattnera7ad98f2008-02-11 00:02:17 +00002558/// GenerateWritableString -- Creates storage for a string literal.
John McCalla5e19c62011-08-04 01:03:22 +00002559static llvm::GlobalVariable *GenerateStringLiteral(StringRef str,
Chris Lattner45e8cbd2007-11-28 05:34:05 +00002560 bool constant,
Daniel Dunbar5fabf9d2008-10-17 21:56:50 +00002561 CodeGenModule &CGM,
John McCalla5e19c62011-08-04 01:03:22 +00002562 const char *GlobalName,
2563 unsigned Alignment) {
Daniel Dunbar61432932008-08-13 23:20:05 +00002564 // Create Constant for this string literal. Don't add a '\0'.
Owen Anderson0032b272009-08-13 21:57:51 +00002565 llvm::Constant *C =
Chris Lattner94010692012-02-05 02:30:40 +00002566 llvm::ConstantDataArray::getString(CGM.getLLVMContext(), str, false);
Mike Stump1eb44332009-09-09 15:08:12 +00002567
Chris Lattner45e8cbd2007-11-28 05:34:05 +00002568 // Create a global variable for this string
Rafael Espindola1257bc62011-01-10 22:34:03 +00002569 llvm::GlobalVariable *GV =
2570 new llvm::GlobalVariable(CGM.getModule(), C->getType(), constant,
2571 llvm::GlobalValue::PrivateLinkage,
2572 C, GlobalName);
John McCalla5e19c62011-08-04 01:03:22 +00002573 GV->setAlignment(Alignment);
Rafael Espindola1257bc62011-01-10 22:34:03 +00002574 GV->setUnnamedAddr(true);
2575 return GV;
Chris Lattner45e8cbd2007-11-28 05:34:05 +00002576}
2577
Daniel Dunbar61432932008-08-13 23:20:05 +00002578/// GetAddrOfConstantString - Returns a pointer to a character array
2579/// containing the literal. This contents are exactly that of the
2580/// given string, i.e. it will not be null terminated automatically;
2581/// see GetAddrOfConstantCString. Note that whether the result is
2582/// actually a pointer to an LLVM constant depends on
2583/// Feature.WriteableStrings.
2584///
2585/// The result has pointer to array type.
Chris Lattner5f9e2722011-07-23 10:55:15 +00002586llvm::Constant *CodeGenModule::GetAddrOfConstantString(StringRef Str,
John McCalla5e19c62011-08-04 01:03:22 +00002587 const char *GlobalName,
2588 unsigned Alignment) {
Daniel Dunbar8e5c2b82009-03-31 23:42:16 +00002589 // Get the default prefix if a name wasn't specified.
2590 if (!GlobalName)
Chris Lattner95b851e2009-07-16 05:03:48 +00002591 GlobalName = ".str";
Daniel Dunbar8e5c2b82009-03-31 23:42:16 +00002592
Ulrich Weigand6b203512013-05-06 16:23:57 +00002593 if (Alignment == 0)
2594 Alignment = getContext().getAlignOfGlobalVarInChars(getContext().CharTy)
2595 .getQuantity();
2596
Daniel Dunbar8e5c2b82009-03-31 23:42:16 +00002597 // Don't share any string literals if strings aren't constant.
David Blaikie4e4d0842012-03-11 07:00:24 +00002598 if (LangOpts.WritableStrings)
John McCalla5e19c62011-08-04 01:03:22 +00002599 return GenerateStringLiteral(Str, false, *this, GlobalName, Alignment);
Mike Stump1eb44332009-09-09 15:08:12 +00002600
John McCalla5e19c62011-08-04 01:03:22 +00002601 llvm::StringMapEntry<llvm::GlobalVariable *> &Entry =
Benjamin Kramer9de43422011-03-05 13:45:23 +00002602 ConstantStringMap.GetOrCreateValue(Str);
Chris Lattner45e8cbd2007-11-28 05:34:05 +00002603
John McCalla5e19c62011-08-04 01:03:22 +00002604 if (llvm::GlobalVariable *GV = Entry.getValue()) {
2605 if (Alignment > GV->getAlignment()) {
2606 GV->setAlignment(Alignment);
2607 }
2608 return GV;
2609 }
Chris Lattner45e8cbd2007-11-28 05:34:05 +00002610
2611 // Create a global variable for this.
Chris Lattner812234b2012-02-06 22:47:00 +00002612 llvm::GlobalVariable *GV = GenerateStringLiteral(Str, true, *this, GlobalName,
2613 Alignment);
John McCalla5e19c62011-08-04 01:03:22 +00002614 Entry.setValue(GV);
2615 return GV;
Chris Lattner45e8cbd2007-11-28 05:34:05 +00002616}
Daniel Dunbar61432932008-08-13 23:20:05 +00002617
2618/// GetAddrOfConstantCString - Returns a pointer to a character
Benjamin Kramer9de43422011-03-05 13:45:23 +00002619/// array containing the literal and a terminating '\0'
Daniel Dunbar61432932008-08-13 23:20:05 +00002620/// character. The result has pointer to array type.
Benjamin Kramer9de43422011-03-05 13:45:23 +00002621llvm::Constant *CodeGenModule::GetAddrOfConstantCString(const std::string &Str,
John McCalla5e19c62011-08-04 01:03:22 +00002622 const char *GlobalName,
2623 unsigned Alignment) {
Chris Lattner5f9e2722011-07-23 10:55:15 +00002624 StringRef StrWithNull(Str.c_str(), Str.size() + 1);
John McCalla5e19c62011-08-04 01:03:22 +00002625 return GetAddrOfConstantString(StrWithNull, GlobalName, Alignment);
Daniel Dunbar61432932008-08-13 23:20:05 +00002626}
Daniel Dunbar41071de2008-08-15 23:26:23 +00002627
Richard Smith211c8dd2013-06-05 00:46:14 +00002628llvm::Constant *CodeGenModule::GetAddrOfGlobalTemporary(
Richard Smith3282b842013-06-14 03:07:01 +00002629 const MaterializeTemporaryExpr *E, const Expr *Init) {
Richard Smith211c8dd2013-06-05 00:46:14 +00002630 assert((E->getStorageDuration() == SD_Static ||
2631 E->getStorageDuration() == SD_Thread) && "not a global temporary");
2632 const VarDecl *VD = cast<VarDecl>(E->getExtendingDecl());
2633
2634 // If we're not materializing a subobject of the temporary, keep the
2635 // cv-qualifiers from the type of the MaterializeTemporaryExpr.
Richard Smith3282b842013-06-14 03:07:01 +00002636 QualType MaterializedType = Init->getType();
2637 if (Init == E->GetTemporaryExpr())
2638 MaterializedType = E->getType();
Richard Smith211c8dd2013-06-05 00:46:14 +00002639
2640 llvm::Constant *&Slot = MaterializedGlobalTemporaryMap[E];
2641 if (Slot)
2642 return Slot;
2643
2644 // FIXME: If an externally-visible declaration extends multiple temporaries,
2645 // we need to give each temporary the same name in every translation unit (and
2646 // we also need to make the temporaries externally-visible).
2647 SmallString<256> Name;
2648 llvm::raw_svector_ostream Out(Name);
2649 getCXXABI().getMangleContext().mangleReferenceTemporary(VD, Out);
2650 Out.flush();
2651
Richard Smith211c8dd2013-06-05 00:46:14 +00002652 APValue *Value = 0;
2653 if (E->getStorageDuration() == SD_Static) {
Richard Smith3282b842013-06-14 03:07:01 +00002654 // We might have a cached constant initializer for this temporary. Note
2655 // that this might have a different value from the value computed by
2656 // evaluating the initializer if the surrounding constant expression
2657 // modifies the temporary.
Richard Smith211c8dd2013-06-05 00:46:14 +00002658 Value = getContext().getMaterializedTemporaryValue(E, false);
2659 if (Value && Value->isUninit())
2660 Value = 0;
2661 }
2662
Richard Smith3282b842013-06-14 03:07:01 +00002663 // Try evaluating it now, it might have a constant initializer.
2664 Expr::EvalResult EvalResult;
2665 if (!Value && Init->EvaluateAsRValue(EvalResult, getContext()) &&
2666 !EvalResult.hasSideEffects())
2667 Value = &EvalResult.Val;
2668
2669 llvm::Constant *InitialValue = 0;
2670 bool Constant = false;
2671 llvm::Type *Type;
Richard Smith211c8dd2013-06-05 00:46:14 +00002672 if (Value) {
2673 // The temporary has a constant initializer, use it.
Richard Smith3282b842013-06-14 03:07:01 +00002674 InitialValue = EmitConstantValue(*Value, MaterializedType, 0);
2675 Constant = isTypeConstant(MaterializedType, /*ExcludeCtor*/Value);
2676 Type = InitialValue->getType();
Richard Smith211c8dd2013-06-05 00:46:14 +00002677 } else {
Richard Smith3282b842013-06-14 03:07:01 +00002678 // No initializer, the initialization will be provided when we
Richard Smith211c8dd2013-06-05 00:46:14 +00002679 // initialize the declaration which performed lifetime extension.
Richard Smith3282b842013-06-14 03:07:01 +00002680 Type = getTypes().ConvertTypeForMem(MaterializedType);
Richard Smith211c8dd2013-06-05 00:46:14 +00002681 }
2682
2683 // Create a global variable for this lifetime-extended temporary.
2684 llvm::GlobalVariable *GV =
Richard Smith3282b842013-06-14 03:07:01 +00002685 new llvm::GlobalVariable(getModule(), Type, Constant,
2686 llvm::GlobalValue::PrivateLinkage,
2687 InitialValue, Name.c_str());
Richard Smith211c8dd2013-06-05 00:46:14 +00002688 GV->setAlignment(
Richard Smith3282b842013-06-14 03:07:01 +00002689 getContext().getTypeAlignInChars(MaterializedType).getQuantity());
Richard Smith211c8dd2013-06-05 00:46:14 +00002690 if (VD->getTLSKind())
2691 setTLSMode(GV, *VD);
2692 Slot = GV;
2693 return GV;
2694}
2695
Daniel Dunbaraf05bb92008-08-26 08:29:31 +00002696/// EmitObjCPropertyImplementations - Emit information for synthesized
2697/// properties for an implementation.
Mike Stump1eb44332009-09-09 15:08:12 +00002698void CodeGenModule::EmitObjCPropertyImplementations(const
Daniel Dunbaraf05bb92008-08-26 08:29:31 +00002699 ObjCImplementationDecl *D) {
Mike Stump1eb44332009-09-09 15:08:12 +00002700 for (ObjCImplementationDecl::propimpl_iterator
Argyrios Kyrtzidis17945a02009-06-30 02:36:12 +00002701 i = D->propimpl_begin(), e = D->propimpl_end(); i != e; ++i) {
David Blaikie581deb32012-06-06 20:45:41 +00002702 ObjCPropertyImplDecl *PID = *i;
Mike Stump1eb44332009-09-09 15:08:12 +00002703
Daniel Dunbaraf05bb92008-08-26 08:29:31 +00002704 // Dynamic is just for type-checking.
2705 if (PID->getPropertyImplementation() == ObjCPropertyImplDecl::Synthesize) {
2706 ObjCPropertyDecl *PD = PID->getPropertyDecl();
2707
2708 // Determine which methods need to be implemented, some may have
Jordan Rose1e4691b2012-10-10 16:42:25 +00002709 // been overridden. Note that ::isPropertyAccessor is not the method
Daniel Dunbaraf05bb92008-08-26 08:29:31 +00002710 // we want, that just indicates if the decl came from a
2711 // property. What we want to know is if the method is defined in
2712 // this implementation.
Argyrios Kyrtzidis17945a02009-06-30 02:36:12 +00002713 if (!D->getInstanceMethod(PD->getGetterName()))
Fariborz Jahanianfef30b52008-12-09 20:23:04 +00002714 CodeGenFunction(*this).GenerateObjCGetter(
2715 const_cast<ObjCImplementationDecl *>(D), PID);
Daniel Dunbaraf05bb92008-08-26 08:29:31 +00002716 if (!PD->isReadOnly() &&
Argyrios Kyrtzidis17945a02009-06-30 02:36:12 +00002717 !D->getInstanceMethod(PD->getSetterName()))
Fariborz Jahanianfef30b52008-12-09 20:23:04 +00002718 CodeGenFunction(*this).GenerateObjCSetter(
2719 const_cast<ObjCImplementationDecl *>(D), PID);
Daniel Dunbaraf05bb92008-08-26 08:29:31 +00002720 }
2721 }
2722}
2723
John McCalle81ac692011-03-22 07:05:39 +00002724static bool needsDestructMethod(ObjCImplementationDecl *impl) {
Jordy Rosedb8264e2011-07-22 02:08:32 +00002725 const ObjCInterfaceDecl *iface = impl->getClassInterface();
2726 for (const ObjCIvarDecl *ivar = iface->all_declared_ivar_begin();
John McCalle81ac692011-03-22 07:05:39 +00002727 ivar; ivar = ivar->getNextIvar())
2728 if (ivar->getType().isDestructedType())
2729 return true;
2730
2731 return false;
2732}
2733
Fariborz Jahanian109dfc62010-04-28 21:28:56 +00002734/// EmitObjCIvarInitializations - Emit information for ivar initialization
2735/// for an implementation.
2736void CodeGenModule::EmitObjCIvarInitializations(ObjCImplementationDecl *D) {
John McCalle81ac692011-03-22 07:05:39 +00002737 // We might need a .cxx_destruct even if we don't have any ivar initializers.
2738 if (needsDestructMethod(D)) {
2739 IdentifierInfo *II = &getContext().Idents.get(".cxx_destruct");
2740 Selector cxxSelector = getContext().Selectors.getSelector(0, &II);
2741 ObjCMethodDecl *DTORMethod =
2742 ObjCMethodDecl::Create(getContext(), D->getLocation(), D->getLocation(),
Argyrios Kyrtzidis75cf3e82011-08-17 19:25:08 +00002743 cxxSelector, getContext().VoidTy, 0, D,
2744 /*isInstance=*/true, /*isVariadic=*/false,
Jordan Rose1e4691b2012-10-10 16:42:25 +00002745 /*isPropertyAccessor=*/true, /*isImplicitlyDeclared=*/true,
Argyrios Kyrtzidis75cf3e82011-08-17 19:25:08 +00002746 /*isDefined=*/false, ObjCMethodDecl::Required);
John McCalle81ac692011-03-22 07:05:39 +00002747 D->addInstanceMethod(DTORMethod);
2748 CodeGenFunction(*this).GenerateObjCCtorDtorMethod(D, DTORMethod, false);
John McCallb03527a2012-10-17 04:53:31 +00002749 D->setHasDestructors(true);
John McCalle81ac692011-03-22 07:05:39 +00002750 }
2751
2752 // If the implementation doesn't have any ivar initializers, we don't need
2753 // a .cxx_construct.
David Chisnall827bbcc2011-03-17 14:19:08 +00002754 if (D->getNumIvarInitializers() == 0)
Fariborz Jahanian109dfc62010-04-28 21:28:56 +00002755 return;
Fariborz Jahanian109dfc62010-04-28 21:28:56 +00002756
John McCalle81ac692011-03-22 07:05:39 +00002757 IdentifierInfo *II = &getContext().Idents.get(".cxx_construct");
2758 Selector cxxSelector = getContext().Selectors.getSelector(0, &II);
Fariborz Jahanian109dfc62010-04-28 21:28:56 +00002759 // The constructor returns 'self'.
2760 ObjCMethodDecl *CTORMethod = ObjCMethodDecl::Create(getContext(),
2761 D->getLocation(),
Argyrios Kyrtzidis11d77162011-10-03 06:36:36 +00002762 D->getLocation(),
Argyrios Kyrtzidis11d77162011-10-03 06:36:36 +00002763 cxxSelector,
Fariborz Jahanian109dfc62010-04-28 21:28:56 +00002764 getContext().getObjCIdType(), 0,
Argyrios Kyrtzidis75cf3e82011-08-17 19:25:08 +00002765 D, /*isInstance=*/true,
2766 /*isVariadic=*/false,
Jordan Rose1e4691b2012-10-10 16:42:25 +00002767 /*isPropertyAccessor=*/true,
Argyrios Kyrtzidis75cf3e82011-08-17 19:25:08 +00002768 /*isImplicitlyDeclared=*/true,
2769 /*isDefined=*/false,
Fariborz Jahanian109dfc62010-04-28 21:28:56 +00002770 ObjCMethodDecl::Required);
2771 D->addInstanceMethod(CTORMethod);
2772 CodeGenFunction(*this).GenerateObjCCtorDtorMethod(D, CTORMethod, true);
John McCallb03527a2012-10-17 04:53:31 +00002773 D->setHasNonZeroConstructors(true);
Fariborz Jahanian109dfc62010-04-28 21:28:56 +00002774}
2775
Anders Carlsson91e20dd2009-04-02 05:55:18 +00002776/// EmitNamespace - Emit all declarations in a namespace.
Anders Carlsson984e0682009-04-01 00:58:25 +00002777void CodeGenModule::EmitNamespace(const NamespaceDecl *ND) {
Argyrios Kyrtzidis17945a02009-06-30 02:36:12 +00002778 for (RecordDecl::decl_iterator I = ND->decls_begin(), E = ND->decls_end();
Anders Carlsson984e0682009-04-01 00:58:25 +00002779 I != E; ++I)
2780 EmitTopLevelDecl(*I);
2781}
2782
Anders Carlsson91e20dd2009-04-02 05:55:18 +00002783// EmitLinkageSpec - Emit all declarations in a linkage spec.
2784void CodeGenModule::EmitLinkageSpec(const LinkageSpecDecl *LSD) {
Eli Friedmanf976be82009-08-01 20:48:04 +00002785 if (LSD->getLanguage() != LinkageSpecDecl::lang_c &&
2786 LSD->getLanguage() != LinkageSpecDecl::lang_cxx) {
Anders Carlsson91e20dd2009-04-02 05:55:18 +00002787 ErrorUnsupported(LSD, "linkage spec");
2788 return;
2789 }
2790
Argyrios Kyrtzidis17945a02009-06-30 02:36:12 +00002791 for (RecordDecl::decl_iterator I = LSD->decls_begin(), E = LSD->decls_end();
Fariborz Jahanianc1868e52012-10-26 20:22:11 +00002792 I != E; ++I) {
Fariborz Jahanian107dae42012-10-26 22:20:25 +00002793 // Meta-data for ObjC class includes references to implemented methods.
2794 // Generate class's method definitions first.
Fariborz Jahanianc1868e52012-10-26 20:22:11 +00002795 if (ObjCImplDecl *OID = dyn_cast<ObjCImplDecl>(*I)) {
2796 for (ObjCContainerDecl::method_iterator M = OID->meth_begin(),
2797 MEnd = OID->meth_end();
2798 M != MEnd; ++M)
2799 EmitTopLevelDecl(*M);
2800 }
Anders Carlsson91e20dd2009-04-02 05:55:18 +00002801 EmitTopLevelDecl(*I);
Fariborz Jahanianc1868e52012-10-26 20:22:11 +00002802 }
Anders Carlsson91e20dd2009-04-02 05:55:18 +00002803}
2804
Daniel Dunbar41071de2008-08-15 23:26:23 +00002805/// EmitTopLevelDecl - Emit code for a single top level declaration.
2806void CodeGenModule::EmitTopLevelDecl(Decl *D) {
2807 // If an error has occurred, stop code generation, but continue
2808 // parsing and semantic analysis (to ensure all warnings and errors
2809 // are emitted).
2810 if (Diags.hasErrorOccurred())
2811 return;
2812
Douglas Gregor16e8be22009-06-29 17:30:29 +00002813 // Ignore dependent declarations.
2814 if (D->getDeclContext() && D->getDeclContext()->isDependentContext())
2815 return;
Mike Stump1eb44332009-09-09 15:08:12 +00002816
Daniel Dunbar41071de2008-08-15 23:26:23 +00002817 switch (D->getKind()) {
Anders Carlsson293361a2009-08-25 13:14:46 +00002818 case Decl::CXXConversion:
Anders Carlsson2b77ba82009-04-04 20:47:02 +00002819 case Decl::CXXMethod:
Daniel Dunbar41071de2008-08-15 23:26:23 +00002820 case Decl::Function:
Douglas Gregor16e8be22009-06-29 17:30:29 +00002821 // Skip function templates
Francois Pichet8387e2a2011-04-22 22:18:13 +00002822 if (cast<FunctionDecl>(D)->getDescribedFunctionTemplate() ||
2823 cast<FunctionDecl>(D)->isLateTemplateParsed())
Douglas Gregor16e8be22009-06-29 17:30:29 +00002824 return;
Mike Stump1eb44332009-09-09 15:08:12 +00002825
Anders Carlsson555b4bb2009-09-10 23:43:36 +00002826 EmitGlobal(cast<FunctionDecl>(D));
2827 break;
2828
Daniel Dunbar41071de2008-08-15 23:26:23 +00002829 case Decl::Var:
Anders Carlsson555b4bb2009-09-10 23:43:36 +00002830 EmitGlobal(cast<VarDecl>(D));
Daniel Dunbar41071de2008-08-15 23:26:23 +00002831 break;
2832
John McCall26fbc722011-04-12 01:01:22 +00002833 // Indirect fields from global anonymous structs and unions can be
2834 // ignored; only the actual variable requires IR gen support.
2835 case Decl::IndirectField:
2836 break;
2837
Anders Carlsson95d4e5d2009-04-15 15:55:24 +00002838 // C++ Decls
Daniel Dunbar41071de2008-08-15 23:26:23 +00002839 case Decl::Namespace:
Anders Carlsson984e0682009-04-01 00:58:25 +00002840 EmitNamespace(cast<NamespaceDecl>(D));
Daniel Dunbar41071de2008-08-15 23:26:23 +00002841 break;
Douglas Gregor9cfbe482009-06-20 00:51:54 +00002842 // No code generation needed.
John McCall9d0c6612009-11-17 09:33:40 +00002843 case Decl::UsingShadow:
Douglas Gregor9cfbe482009-06-20 00:51:54 +00002844 case Decl::Using:
Douglas Gregor127102b2009-06-29 20:59:39 +00002845 case Decl::ClassTemplate:
2846 case Decl::FunctionTemplate:
Richard Smith3e4c6c42011-05-05 21:57:07 +00002847 case Decl::TypeAliasTemplate:
Douglas Gregor6a576ab2011-06-05 05:04:23 +00002848 case Decl::Block:
Michael Han684aa732013-02-22 17:15:32 +00002849 case Decl::Empty:
Douglas Gregor9cfbe482009-06-20 00:51:54 +00002850 break;
David Blaikiefc46ebc2013-05-20 22:50:41 +00002851 case Decl::NamespaceAlias:
2852 if (CGDebugInfo *DI = getModuleDebugInfo())
2853 DI->EmitNamespaceAlias(cast<NamespaceAliasDecl>(*D));
2854 return;
David Blaikie1601a4a2013-04-26 05:41:06 +00002855 case Decl::UsingDirective: // using namespace X; [C++]
2856 if (CGDebugInfo *DI = getModuleDebugInfo())
2857 DI->EmitUsingDirective(cast<UsingDirectiveDecl>(*D));
2858 return;
Anders Carlsson95d4e5d2009-04-15 15:55:24 +00002859 case Decl::CXXConstructor:
Anders Carlsson1fe598c2009-11-24 05:16:24 +00002860 // Skip function templates
Francois Pichet8387e2a2011-04-22 22:18:13 +00002861 if (cast<FunctionDecl>(D)->getDescribedFunctionTemplate() ||
2862 cast<FunctionDecl>(D)->isLateTemplateParsed())
Anders Carlsson1fe598c2009-11-24 05:16:24 +00002863 return;
2864
Anders Carlsson95d4e5d2009-04-15 15:55:24 +00002865 EmitCXXConstructors(cast<CXXConstructorDecl>(D));
2866 break;
Anders Carlsson27ae5362009-04-17 01:58:57 +00002867 case Decl::CXXDestructor:
Francois Pichet8387e2a2011-04-22 22:18:13 +00002868 if (cast<FunctionDecl>(D)->isLateTemplateParsed())
2869 return;
Anders Carlsson27ae5362009-04-17 01:58:57 +00002870 EmitCXXDestructors(cast<CXXDestructorDecl>(D));
2871 break;
Anders Carlsson36674d22009-06-11 21:22:55 +00002872
2873 case Decl::StaticAssert:
2874 // Nothing to do.
2875 break;
2876
Anders Carlsson95d4e5d2009-04-15 15:55:24 +00002877 // Objective-C Decls
Mike Stump1eb44332009-09-09 15:08:12 +00002878
Fariborz Jahanian38e24c72009-03-18 22:33:24 +00002879 // Forward declarations, no (immediate) code generation.
Chris Lattner285d0db2009-04-01 02:36:43 +00002880 case Decl::ObjCInterface:
Eric Christopherffb0c3a2012-07-19 22:22:55 +00002881 case Decl::ObjCCategory:
Chris Lattner285d0db2009-04-01 02:36:43 +00002882 break;
2883
Douglas Gregorbd9482d2012-01-01 21:23:57 +00002884 case Decl::ObjCProtocol: {
2885 ObjCProtocolDecl *Proto = cast<ObjCProtocolDecl>(D);
2886 if (Proto->isThisDeclarationADefinition())
2887 ObjCRuntime->GenerateProtocol(Proto);
Daniel Dunbar41071de2008-08-15 23:26:23 +00002888 break;
Douglas Gregorbd9482d2012-01-01 21:23:57 +00002889 }
2890
Daniel Dunbar41071de2008-08-15 23:26:23 +00002891 case Decl::ObjCCategoryImpl:
Daniel Dunbaraf05bb92008-08-26 08:29:31 +00002892 // Categories have properties but don't support synthesize so we
2893 // can ignore them here.
Peter Collingbournee9265232011-07-27 20:29:46 +00002894 ObjCRuntime->GenerateCategory(cast<ObjCCategoryImplDecl>(D));
Daniel Dunbar41071de2008-08-15 23:26:23 +00002895 break;
2896
Daniel Dunbaraf05bb92008-08-26 08:29:31 +00002897 case Decl::ObjCImplementation: {
2898 ObjCImplementationDecl *OMD = cast<ObjCImplementationDecl>(D);
2899 EmitObjCPropertyImplementations(OMD);
Fariborz Jahanian109dfc62010-04-28 21:28:56 +00002900 EmitObjCIvarInitializations(OMD);
Peter Collingbournee9265232011-07-27 20:29:46 +00002901 ObjCRuntime->GenerateClass(OMD);
Eric Christopherbe6c6862012-04-11 05:56:05 +00002902 // Emit global variable debug information.
2903 if (CGDebugInfo *DI = getModuleDebugInfo())
Alexey Samsonov96a66392012-12-03 18:28:12 +00002904 if (getCodeGenOpts().getDebugInfo() >= CodeGenOptions::LimitedDebugInfo)
2905 DI->getOrCreateInterfaceType(getContext().getObjCInterfaceType(
2906 OMD->getClassInterface()), OMD->getLocation());
Daniel Dunbar41071de2008-08-15 23:26:23 +00002907 break;
Mike Stump1eb44332009-09-09 15:08:12 +00002908 }
Daniel Dunbar41071de2008-08-15 23:26:23 +00002909 case Decl::ObjCMethod: {
2910 ObjCMethodDecl *OMD = cast<ObjCMethodDecl>(D);
2911 // If this is not a prototype, emit the body.
Argyrios Kyrtzidis6fb0aee2009-06-30 02:35:26 +00002912 if (OMD->getBody())
Daniel Dunbar41071de2008-08-15 23:26:23 +00002913 CodeGenFunction(*this).GenerateObjCMethod(OMD);
2914 break;
2915 }
Mike Stump1eb44332009-09-09 15:08:12 +00002916 case Decl::ObjCCompatibleAlias:
David Chisnall29254f42012-01-31 18:59:20 +00002917 ObjCRuntime->RegisterAlias(cast<ObjCCompatibleAliasDecl>(D));
Daniel Dunbar41071de2008-08-15 23:26:23 +00002918 break;
2919
Anders Carlsson91e20dd2009-04-02 05:55:18 +00002920 case Decl::LinkageSpec:
2921 EmitLinkageSpec(cast<LinkageSpecDecl>(D));
Daniel Dunbar41071de2008-08-15 23:26:23 +00002922 break;
Daniel Dunbar41071de2008-08-15 23:26:23 +00002923
2924 case Decl::FileScopeAsm: {
2925 FileScopeAsmDecl *AD = cast<FileScopeAsmDecl>(D);
Chris Lattner5f9e2722011-07-23 10:55:15 +00002926 StringRef AsmString = AD->getAsmString()->getString();
Mike Stump1eb44332009-09-09 15:08:12 +00002927
Daniel Dunbar41071de2008-08-15 23:26:23 +00002928 const std::string &S = getModule().getModuleInlineAsm();
2929 if (S.empty())
2930 getModule().setModuleInlineAsm(AsmString);
Joerg Sonnenberger8ce9cca2012-08-10 10:57:52 +00002931 else if (S.end()[-1] == '\n')
Chris Lattner9f5bff02011-07-23 20:04:25 +00002932 getModule().setModuleInlineAsm(S + AsmString.str());
Daniel Dunbar41071de2008-08-15 23:26:23 +00002933 else
Benjamin Kramer8d042582009-12-11 13:33:18 +00002934 getModule().setModuleInlineAsm(S + '\n' + AsmString.str());
Daniel Dunbar41071de2008-08-15 23:26:23 +00002935 break;
2936 }
Mike Stump1eb44332009-09-09 15:08:12 +00002937
Douglas Gregorb6cbe512013-01-14 17:21:00 +00002938 case Decl::Import: {
2939 ImportDecl *Import = cast<ImportDecl>(D);
2940
2941 // Ignore import declarations that come from imported modules.
2942 if (clang::Module *Owner = Import->getOwningModule()) {
2943 if (getLangOpts().CurrentModule.empty() ||
2944 Owner->getTopLevelModule()->Name == getLangOpts().CurrentModule)
2945 break;
2946 }
2947
Douglas Gregor858afb32013-01-14 20:53:57 +00002948 ImportedModules.insert(Import->getImportedModule());
Douglas Gregorb6cbe512013-01-14 17:21:00 +00002949 break;
2950 }
2951
Mike Stump1eb44332009-09-09 15:08:12 +00002952 default:
Mike Stumpf5408fe2009-05-16 07:57:57 +00002953 // Make sure we handled everything we should, every other kind is a
2954 // non-top-level decl. FIXME: Would be nice to have an isTopLevelDeclKind
2955 // function. Need to recode Decl::Kind to do that easily.
Daniel Dunbar41071de2008-08-15 23:26:23 +00002956 assert(isa<TypeDecl>(D) && "Unsupported decl kind");
2957 }
2958}
John McCall744016d2010-07-06 23:57:41 +00002959
2960/// Turns the given pointer into a constant.
2961static llvm::Constant *GetPointerConstant(llvm::LLVMContext &Context,
2962 const void *Ptr) {
2963 uintptr_t PtrInt = reinterpret_cast<uintptr_t>(Ptr);
Chris Lattner2acc6e32011-07-18 04:24:23 +00002964 llvm::Type *i64 = llvm::Type::getInt64Ty(Context);
John McCall744016d2010-07-06 23:57:41 +00002965 return llvm::ConstantInt::get(i64, PtrInt);
2966}
2967
2968static void EmitGlobalDeclMetadata(CodeGenModule &CGM,
2969 llvm::NamedMDNode *&GlobalMetadata,
2970 GlobalDecl D,
2971 llvm::GlobalValue *Addr) {
2972 if (!GlobalMetadata)
2973 GlobalMetadata =
2974 CGM.getModule().getOrInsertNamedMetadata("clang.global.decl.ptrs");
2975
2976 // TODO: should we report variant information for ctors/dtors?
2977 llvm::Value *Ops[] = {
2978 Addr,
2979 GetPointerConstant(CGM.getLLVMContext(), D.getDecl())
2980 };
Jay Foad6f141652011-04-21 19:59:12 +00002981 GlobalMetadata->addOperand(llvm::MDNode::get(CGM.getLLVMContext(), Ops));
John McCall744016d2010-07-06 23:57:41 +00002982}
2983
Richard Smith00249372013-04-06 05:00:46 +00002984/// For each function which is declared within an extern "C" region and marked
2985/// as 'used', but has internal linkage, create an alias from the unmangled
2986/// name to the mangled name if possible. People expect to be able to refer
2987/// to such functions with an unmangled name from inline assembly within the
2988/// same translation unit.
2989void CodeGenModule::EmitStaticExternCAliases() {
Richard Smith84083b72013-04-13 01:28:18 +00002990 for (StaticExternCMap::iterator I = StaticExternCValues.begin(),
2991 E = StaticExternCValues.end();
2992 I != E; ++I) {
2993 IdentifierInfo *Name = I->first;
2994 llvm::GlobalValue *Val = I->second;
Richard Smith67972042013-04-06 07:07:44 +00002995 if (Val && !getModule().getNamedValue(Name->getName()))
2996 AddUsedGlobal(new llvm::GlobalAlias(Val->getType(), Val->getLinkage(),
2997 Name->getName(), Val, &getModule()));
2998 }
Richard Smith00249372013-04-06 05:00:46 +00002999}
3000
John McCall744016d2010-07-06 23:57:41 +00003001/// Emits metadata nodes associating all the global values in the
3002/// current module with the Decls they came from. This is useful for
3003/// projects using IR gen as a subroutine.
3004///
3005/// Since there's currently no way to associate an MDNode directly
3006/// with an llvm::GlobalValue, we create a global named metadata
3007/// with the name 'clang.global.decl.ptrs'.
3008void CodeGenModule::EmitDeclMetadata() {
3009 llvm::NamedMDNode *GlobalMetadata = 0;
3010
3011 // StaticLocalDeclMap
Chris Lattner5f9e2722011-07-23 10:55:15 +00003012 for (llvm::DenseMap<GlobalDecl,StringRef>::iterator
John McCall744016d2010-07-06 23:57:41 +00003013 I = MangledDeclNames.begin(), E = MangledDeclNames.end();
3014 I != E; ++I) {
3015 llvm::GlobalValue *Addr = getModule().getNamedValue(I->second);
3016 EmitGlobalDeclMetadata(*this, GlobalMetadata, I->first, Addr);
3017 }
3018}
3019
3020/// Emits metadata nodes for all the local variables in the current
3021/// function.
3022void CodeGenFunction::EmitDeclMetadata() {
3023 if (LocalDeclMap.empty()) return;
3024
3025 llvm::LLVMContext &Context = getLLVMContext();
3026
3027 // Find the unique metadata ID for this name.
3028 unsigned DeclPtrKind = Context.getMDKindID("clang.decl.ptr");
3029
3030 llvm::NamedMDNode *GlobalMetadata = 0;
3031
3032 for (llvm::DenseMap<const Decl*, llvm::Value*>::iterator
3033 I = LocalDeclMap.begin(), E = LocalDeclMap.end(); I != E; ++I) {
3034 const Decl *D = I->first;
3035 llvm::Value *Addr = I->second;
3036
3037 if (llvm::AllocaInst *Alloca = dyn_cast<llvm::AllocaInst>(Addr)) {
3038 llvm::Value *DAddr = GetPointerConstant(getLLVMContext(), D);
Jay Foad6f141652011-04-21 19:59:12 +00003039 Alloca->setMetadata(DeclPtrKind, llvm::MDNode::get(Context, DAddr));
John McCall744016d2010-07-06 23:57:41 +00003040 } else if (llvm::GlobalValue *GV = dyn_cast<llvm::GlobalValue>(Addr)) {
3041 GlobalDecl GD = GlobalDecl(cast<VarDecl>(D));
3042 EmitGlobalDeclMetadata(CGM, GlobalMetadata, GD, GV);
3043 }
3044 }
3045}
Daniel Dunbar673431a2010-07-16 00:00:15 +00003046
Nick Lewycky3dc05412011-05-05 00:08:20 +00003047void CodeGenModule::EmitCoverageFile() {
3048 if (!getCodeGenOpts().CoverageFile.empty()) {
Nick Lewycky5ea4f442011-05-04 20:46:58 +00003049 if (llvm::NamedMDNode *CUNode = TheModule.getNamedMetadata("llvm.dbg.cu")) {
3050 llvm::NamedMDNode *GCov = TheModule.getOrInsertNamedMetadata("llvm.gcov");
3051 llvm::LLVMContext &Ctx = TheModule.getContext();
Nick Lewycky3dc05412011-05-05 00:08:20 +00003052 llvm::MDString *CoverageFile =
3053 llvm::MDString::get(Ctx, getCodeGenOpts().CoverageFile);
Nick Lewycky5ea4f442011-05-04 20:46:58 +00003054 for (int i = 0, e = CUNode->getNumOperands(); i != e; ++i) {
3055 llvm::MDNode *CU = CUNode->getOperand(i);
Nick Lewycky3dc05412011-05-05 00:08:20 +00003056 llvm::Value *node[] = { CoverageFile, CU };
Nick Lewycky5ea4f442011-05-04 20:46:58 +00003057 llvm::MDNode *N = llvm::MDNode::get(Ctx, node);
3058 GCov->addOperand(N);
3059 }
3060 }
3061 }
3062}
Nico Weberc5f80462012-10-11 10:13:44 +00003063
3064llvm::Constant *CodeGenModule::EmitUuidofInitializer(StringRef Uuid,
3065 QualType GuidType) {
3066 // Sema has checked that all uuid strings are of the form
3067 // "12345678-1234-1234-1234-1234567890ab".
3068 assert(Uuid.size() == 36);
3069 const char *Uuidstr = Uuid.data();
3070 for (int i = 0; i < 36; ++i) {
3071 if (i == 8 || i == 13 || i == 18 || i == 23) assert(Uuidstr[i] == '-');
Jordan Rose3f6f51e2013-02-08 22:30:41 +00003072 else assert(isHexDigit(Uuidstr[i]));
Nico Weberc5f80462012-10-11 10:13:44 +00003073 }
3074
3075 llvm::APInt Field0(32, StringRef(Uuidstr , 8), 16);
3076 llvm::APInt Field1(16, StringRef(Uuidstr + 9, 4), 16);
3077 llvm::APInt Field2(16, StringRef(Uuidstr + 14, 4), 16);
Nico Weber193646f2012-10-17 00:34:34 +00003078 static const int Field3ValueOffsets[] = { 19, 21, 24, 26, 28, 30, 32, 34 };
Nico Weberc5f80462012-10-11 10:13:44 +00003079
3080 APValue InitStruct(APValue::UninitStruct(), /*NumBases=*/0, /*NumFields=*/4);
3081 InitStruct.getStructField(0) = APValue(llvm::APSInt(Field0));
3082 InitStruct.getStructField(1) = APValue(llvm::APSInt(Field1));
3083 InitStruct.getStructField(2) = APValue(llvm::APSInt(Field2));
3084 APValue& Arr = InitStruct.getStructField(3);
3085 Arr = APValue(APValue::UninitArray(), 8, 8);
3086 for (int t = 0; t < 8; ++t)
Nico Weber43085812012-10-13 21:56:05 +00003087 Arr.getArrayInitializedElt(t) = APValue(llvm::APSInt(
3088 llvm::APInt(8, StringRef(Uuidstr + Field3ValueOffsets[t], 2), 16)));
Nico Weberc5f80462012-10-11 10:13:44 +00003089
3090 return EmitConstantValue(InitStruct, GuidType);
3091}