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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 }
Douglas Gregor5d75ea72013-01-14 18:28:43 +0000193
John McCallb2593832010-09-16 06:16:50 +0000194 SimplifyPersonality();
195
John McCall744016d2010-07-06 23:57:41 +0000196 if (getCodeGenOpts().EmitDeclMetadata)
197 EmitDeclMetadata();
Nick Lewycky5ea4f442011-05-04 20:46:58 +0000198
199 if (getCodeGenOpts().EmitGcovArcs || getCodeGenOpts().EmitGcovNotes)
Nick Lewycky3dc05412011-05-05 00:08:20 +0000200 EmitCoverageFile();
Devang Patelf391dbe2011-08-16 20:58:22 +0000201
202 if (DebugInfo)
203 DebugInfo->finalize();
Daniel Dunbarf1968f22008-10-01 00:49:24 +0000204}
205
Devang Patele80d5672011-03-23 16:29:39 +0000206void CodeGenModule::UpdateCompletedType(const TagDecl *TD) {
207 // Make sure that this type is translated.
208 Types.UpdateCompletedType(TD);
Devang Patele80d5672011-03-23 16:29:39 +0000209}
210
Dan Gohman3d5aff52010-10-14 23:06:10 +0000211llvm::MDNode *CodeGenModule::getTBAAInfo(QualType QTy) {
212 if (!TBAA)
213 return 0;
214 return TBAA->getTBAAInfo(QTy);
215}
216
Kostya Serebryany8cb4a072012-03-26 17:03:51 +0000217llvm::MDNode *CodeGenModule::getTBAAInfoForVTablePtr() {
218 if (!TBAA)
219 return 0;
220 return TBAA->getTBAAInfoForVTablePtr();
221}
222
Dan Gohmanb22c7dc2012-09-28 21:58:29 +0000223llvm::MDNode *CodeGenModule::getTBAAStructInfo(QualType QTy) {
224 if (!TBAA)
225 return 0;
226 return TBAA->getTBAAStructInfo(QTy);
227}
228
Manman Renb37a73d2013-04-04 21:53:22 +0000229llvm::MDNode *CodeGenModule::getTBAAStructTypeInfo(QualType QTy) {
230 if (!TBAA)
231 return 0;
232 return TBAA->getTBAAStructTypeInfo(QTy);
233}
234
235llvm::MDNode *CodeGenModule::getTBAAStructTagInfo(QualType BaseTy,
236 llvm::MDNode *AccessN,
237 uint64_t O) {
238 if (!TBAA)
239 return 0;
240 return TBAA->getTBAAStructTagInfo(BaseTy, AccessN, O);
241}
242
Manman Renca835182013-04-11 23:02:56 +0000243/// Decorate the instruction with a TBAA tag. For scalar TBAA, the tag
244/// is the same as the type. For struct-path aware TBAA, the tag
245/// is different from the type: base type, access type and offset.
246/// When ConvertTypeToTag is true, we create a tag based on the scalar type.
Dan Gohman3d5aff52010-10-14 23:06:10 +0000247void CodeGenModule::DecorateInstruction(llvm::Instruction *Inst,
Manman Renca835182013-04-11 23:02:56 +0000248 llvm::MDNode *TBAAInfo,
249 bool ConvertTypeToTag) {
250 if (ConvertTypeToTag && TBAA && CodeGenOpts.StructPathTBAA)
251 Inst->setMetadata(llvm::LLVMContext::MD_tbaa,
252 TBAA->getTBAAScalarTagInfo(TBAAInfo));
253 else
254 Inst->setMetadata(llvm::LLVMContext::MD_tbaa, TBAAInfo);
Dan Gohman3d5aff52010-10-14 23:06:10 +0000255}
256
Chandler Carruth0f30a122012-03-30 19:44:53 +0000257void CodeGenModule::Error(SourceLocation loc, StringRef error) {
258 unsigned diagID = getDiags().getCustomDiagID(DiagnosticsEngine::Error, error);
John McCall32096692011-03-18 02:56:14 +0000259 getDiags().Report(Context.getFullLoc(loc), diagID);
260}
261
Daniel Dunbar488e9932008-08-16 00:56:44 +0000262/// ErrorUnsupported - Print out an error that codegen doesn't support the
Chris Lattner2c8569d2007-12-02 07:19:18 +0000263/// specified stmt yet.
Daniel Dunbar90df4b62008-09-04 03:43:08 +0000264void CodeGenModule::ErrorUnsupported(const Stmt *S, const char *Type,
265 bool OmitOnError) {
266 if (OmitOnError && getDiags().hasErrorOccurred())
267 return;
David Blaikied6471f72011-09-25 23:23:43 +0000268 unsigned DiagID = getDiags().getCustomDiagID(DiagnosticsEngine::Error,
Daniel Dunbar56b80012009-02-06 19:18:03 +0000269 "cannot compile this %0 yet");
Chris Lattner2c8569d2007-12-02 07:19:18 +0000270 std::string Msg = Type;
Chris Lattner0a14eee2008-11-18 07:04:44 +0000271 getDiags().Report(Context.getFullLoc(S->getLocStart()), DiagID)
272 << Msg << S->getSourceRange();
Chris Lattner2c8569d2007-12-02 07:19:18 +0000273}
Chris Lattner58c3f9e2007-12-02 06:27:33 +0000274
Daniel Dunbar488e9932008-08-16 00:56:44 +0000275/// ErrorUnsupported - Print out an error that codegen doesn't support the
Chris Lattnerc6fdc342008-01-12 07:05:38 +0000276/// specified decl yet.
Daniel Dunbar90df4b62008-09-04 03:43:08 +0000277void CodeGenModule::ErrorUnsupported(const Decl *D, const char *Type,
278 bool OmitOnError) {
279 if (OmitOnError && getDiags().hasErrorOccurred())
280 return;
David Blaikied6471f72011-09-25 23:23:43 +0000281 unsigned DiagID = getDiags().getCustomDiagID(DiagnosticsEngine::Error,
Daniel Dunbar56b80012009-02-06 19:18:03 +0000282 "cannot compile this %0 yet");
Chris Lattnerc6fdc342008-01-12 07:05:38 +0000283 std::string Msg = Type;
Chris Lattner0a14eee2008-11-18 07:04:44 +0000284 getDiags().Report(Context.getFullLoc(D->getLocation()), DiagID) << Msg;
Chris Lattnerc6fdc342008-01-12 07:05:38 +0000285}
286
John McCallbc8d40d2011-06-24 21:55:10 +0000287llvm::ConstantInt *CodeGenModule::getSize(CharUnits size) {
288 return llvm::ConstantInt::get(SizeTy, size.getQuantity());
289}
290
Mike Stump1eb44332009-09-09 15:08:12 +0000291void CodeGenModule::setGlobalVisibility(llvm::GlobalValue *GV,
Anders Carlsson0ffeaad2011-01-29 19:39:23 +0000292 const NamedDecl *D) const {
Daniel Dunbar04d40782009-04-14 06:00:08 +0000293 // Internal definitions always have default visibility.
Chris Lattnerdf102fc2009-04-14 05:27:13 +0000294 if (GV->hasLocalLinkage()) {
Daniel Dunbar7e714cd2009-04-10 20:26:50 +0000295 GV->setVisibility(llvm::GlobalValue::DefaultVisibility);
Daniel Dunbar6ab187a2009-04-07 05:48:37 +0000296 return;
Daniel Dunbar7e714cd2009-04-10 20:26:50 +0000297 }
Daniel Dunbar6ab187a2009-04-07 05:48:37 +0000298
John McCallaf146032010-10-30 11:50:40 +0000299 // Set visibility for definitions.
Rafael Espindola2beda122013-02-27 02:15:29 +0000300 LinkageInfo LV = D->getLinkageAndVisibility();
Rafael Espindolaf127eb82013-02-27 02:56:45 +0000301 if (LV.isVisibilityExplicit() || !GV->hasAvailableExternallyLinkage())
302 GV->setVisibility(GetLLVMVisibility(LV.getVisibility()));
Dan Gohman4f8d1232008-05-22 00:50:06 +0000303}
304
Hans Wennborgde981f32012-06-28 08:01:44 +0000305static llvm::GlobalVariable::ThreadLocalMode GetLLVMTLSModel(StringRef S) {
306 return llvm::StringSwitch<llvm::GlobalVariable::ThreadLocalMode>(S)
307 .Case("global-dynamic", llvm::GlobalVariable::GeneralDynamicTLSModel)
308 .Case("local-dynamic", llvm::GlobalVariable::LocalDynamicTLSModel)
309 .Case("initial-exec", llvm::GlobalVariable::InitialExecTLSModel)
310 .Case("local-exec", llvm::GlobalVariable::LocalExecTLSModel);
311}
312
313static llvm::GlobalVariable::ThreadLocalMode GetLLVMTLSModel(
314 CodeGenOptions::TLSModel M) {
315 switch (M) {
316 case CodeGenOptions::GeneralDynamicTLSModel:
317 return llvm::GlobalVariable::GeneralDynamicTLSModel;
318 case CodeGenOptions::LocalDynamicTLSModel:
319 return llvm::GlobalVariable::LocalDynamicTLSModel;
320 case CodeGenOptions::InitialExecTLSModel:
321 return llvm::GlobalVariable::InitialExecTLSModel;
322 case CodeGenOptions::LocalExecTLSModel:
323 return llvm::GlobalVariable::LocalExecTLSModel;
324 }
325 llvm_unreachable("Invalid TLS model!");
326}
327
328void CodeGenModule::setTLSMode(llvm::GlobalVariable *GV,
329 const VarDecl &D) const {
Richard Smith38afbc72013-04-13 02:43:54 +0000330 assert(D.getTLSKind() && "setting TLS mode on non-TLS var!");
Hans Wennborgde981f32012-06-28 08:01:44 +0000331
332 llvm::GlobalVariable::ThreadLocalMode TLM;
Douglas Gregor4cdad312012-10-23 20:05:01 +0000333 TLM = GetLLVMTLSModel(CodeGenOpts.getDefaultTLSModel());
Hans Wennborgde981f32012-06-28 08:01:44 +0000334
335 // Override the TLS model if it is explicitly specified.
336 if (D.hasAttr<TLSModelAttr>()) {
337 const TLSModelAttr *Attr = D.getAttr<TLSModelAttr>();
338 TLM = GetLLVMTLSModel(Attr->getModel());
339 }
340
341 GV->setThreadLocalMode(TLM);
342}
343
John McCallcbfe5022010-08-04 08:34:44 +0000344/// Set the symbol visibility of type information (vtable and RTTI)
345/// associated with the given type.
346void CodeGenModule::setTypeVisibility(llvm::GlobalValue *GV,
347 const CXXRecordDecl *RD,
Anders Carlssonfa2e99f2011-01-29 20:24:48 +0000348 TypeVisibilityKind TVK) const {
Anders Carlsson0ffeaad2011-01-29 19:39:23 +0000349 setGlobalVisibility(GV, RD);
John McCallcbfe5022010-08-04 08:34:44 +0000350
John McCall279b5eb2010-08-12 23:36:15 +0000351 if (!CodeGenOpts.HiddenWeakVTables)
352 return;
353
Anders Carlsson9a86a132011-01-29 20:36:11 +0000354 // We never want to drop the visibility for RTTI names.
355 if (TVK == TVK_ForRTTIName)
356 return;
357
John McCallcbfe5022010-08-04 08:34:44 +0000358 // We want to drop the visibility to hidden for weak type symbols.
359 // This isn't possible if there might be unresolved references
360 // elsewhere that rely on this symbol being visible.
361
John McCall7a536902010-08-05 20:39:18 +0000362 // This should be kept roughly in sync with setThunkVisibility
363 // in CGVTables.cpp.
364
John McCallcbfe5022010-08-04 08:34:44 +0000365 // Preconditions.
Anders Carlssonf502d932011-01-24 00:46:19 +0000366 if (GV->getLinkage() != llvm::GlobalVariable::LinkOnceODRLinkage ||
John McCallcbfe5022010-08-04 08:34:44 +0000367 GV->getVisibility() != llvm::GlobalVariable::DefaultVisibility)
368 return;
369
370 // Don't override an explicit visibility attribute.
John McCalld4c3d662013-02-20 01:54:26 +0000371 if (RD->getExplicitVisibility(NamedDecl::VisibilityForType))
John McCallcbfe5022010-08-04 08:34:44 +0000372 return;
373
374 switch (RD->getTemplateSpecializationKind()) {
375 // We have to disable the optimization if this is an EI definition
376 // because there might be EI declarations in other shared objects.
377 case TSK_ExplicitInstantiationDefinition:
378 case TSK_ExplicitInstantiationDeclaration:
379 return;
380
John McCall7a536902010-08-05 20:39:18 +0000381 // Every use of a non-template class's type information has to emit it.
John McCallcbfe5022010-08-04 08:34:44 +0000382 case TSK_Undeclared:
383 break;
384
John McCall7a536902010-08-05 20:39:18 +0000385 // In theory, implicit instantiations can ignore the possibility of
386 // an explicit instantiation declaration because there necessarily
387 // must be an EI definition somewhere with default visibility. In
388 // practice, it's possible to have an explicit instantiation for
389 // an arbitrary template class, and linkers aren't necessarily able
390 // to deal with mixed-visibility symbols.
391 case TSK_ExplicitSpecialization:
John McCallcbfe5022010-08-04 08:34:44 +0000392 case TSK_ImplicitInstantiation:
Douglas Gregoraafd1112012-10-24 14:11:55 +0000393 return;
John McCallcbfe5022010-08-04 08:34:44 +0000394 }
395
396 // If there's a key function, there may be translation units
397 // that don't have the key function's definition. But ignore
398 // this if we're emitting RTTI under -fno-rtti.
David Blaikie4e4d0842012-03-11 07:00:24 +0000399 if (!(TVK != TVK_ForRTTI) || LangOpts.RTTI) {
John McCalld5617ee2013-01-25 22:31:03 +0000400 // FIXME: what should we do if we "lose" the key function during
401 // the emission of the file?
402 if (Context.getCurrentKeyFunction(RD))
John McCallcbfe5022010-08-04 08:34:44 +0000403 return;
Anders Carlssonfa2e99f2011-01-29 20:24:48 +0000404 }
John McCallcbfe5022010-08-04 08:34:44 +0000405
406 // Otherwise, drop the visibility to hidden.
407 GV->setVisibility(llvm::GlobalValue::HiddenVisibility);
Rafael Espindolab1c65ff2011-01-11 21:44:37 +0000408 GV->setUnnamedAddr(true);
John McCallcbfe5022010-08-04 08:34:44 +0000409}
410
Chris Lattner5f9e2722011-07-23 10:55:15 +0000411StringRef CodeGenModule::getMangledName(GlobalDecl GD) {
Anders Carlsson793a9902010-06-22 16:05:32 +0000412 const NamedDecl *ND = cast<NamedDecl>(GD.getDecl());
413
Chris Lattner5f9e2722011-07-23 10:55:15 +0000414 StringRef &Str = MangledDeclNames[GD.getCanonicalDecl()];
Anders Carlsson793a9902010-06-22 16:05:32 +0000415 if (!Str.empty())
416 return Str;
417
John McCall4c40d982010-08-31 07:33:07 +0000418 if (!getCXXABI().getMangleContext().shouldMangleDeclName(ND)) {
Anders Carlsson793a9902010-06-22 16:05:32 +0000419 IdentifierInfo *II = ND->getIdentifier();
420 assert(II && "Attempt to mangle unnamed decl.");
421
422 Str = II->getName();
423 return Str;
424 }
425
Dylan Noblesmithf7ccbad2012-02-05 02:13:05 +0000426 SmallString<256> Buffer;
Rafael Espindolac4850c22011-02-10 23:59:36 +0000427 llvm::raw_svector_ostream Out(Buffer);
Anders Carlsson793a9902010-06-22 16:05:32 +0000428 if (const CXXConstructorDecl *D = dyn_cast<CXXConstructorDecl>(ND))
Rafael Espindolac4850c22011-02-10 23:59:36 +0000429 getCXXABI().getMangleContext().mangleCXXCtor(D, GD.getCtorType(), Out);
Anders Carlsson793a9902010-06-22 16:05:32 +0000430 else if (const CXXDestructorDecl *D = dyn_cast<CXXDestructorDecl>(ND))
Rafael Espindolac4850c22011-02-10 23:59:36 +0000431 getCXXABI().getMangleContext().mangleCXXDtor(D, GD.getDtorType(), Out);
Anders Carlsson793a9902010-06-22 16:05:32 +0000432 else if (const BlockDecl *BD = dyn_cast<BlockDecl>(ND))
Fariborz Jahanian4904bf42012-06-26 16:06:38 +0000433 getCXXABI().getMangleContext().mangleBlock(BD, Out,
434 dyn_cast_or_null<VarDecl>(initializedGlobalDecl.getDecl()));
Anders Carlsson793a9902010-06-22 16:05:32 +0000435 else
Rafael Espindolac4850c22011-02-10 23:59:36 +0000436 getCXXABI().getMangleContext().mangleName(ND, Out);
Anders Carlsson793a9902010-06-22 16:05:32 +0000437
438 // Allocate space for the mangled name.
Rafael Espindolac4850c22011-02-10 23:59:36 +0000439 Out.flush();
Anders Carlsson793a9902010-06-22 16:05:32 +0000440 size_t Length = Buffer.size();
441 char *Name = MangledNamesAllocator.Allocate<char>(Length);
442 std::copy(Buffer.begin(), Buffer.end(), Name);
443
Chris Lattner5f9e2722011-07-23 10:55:15 +0000444 Str = StringRef(Name, Length);
Anders Carlsson793a9902010-06-22 16:05:32 +0000445
446 return Str;
447}
448
Peter Collingbourne14110472011-01-13 18:57:25 +0000449void CodeGenModule::getBlockMangledName(GlobalDecl GD, MangleBuffer &Buffer,
450 const BlockDecl *BD) {
451 MangleContext &MangleCtx = getCXXABI().getMangleContext();
452 const Decl *D = GD.getDecl();
Rafael Espindolac4850c22011-02-10 23:59:36 +0000453 llvm::raw_svector_ostream Out(Buffer.getBuffer());
Peter Collingbourne14110472011-01-13 18:57:25 +0000454 if (D == 0)
Fariborz Jahanian4904bf42012-06-26 16:06:38 +0000455 MangleCtx.mangleGlobalBlock(BD,
456 dyn_cast_or_null<VarDecl>(initializedGlobalDecl.getDecl()), Out);
Peter Collingbourne14110472011-01-13 18:57:25 +0000457 else if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(D))
Rafael Espindolac4850c22011-02-10 23:59:36 +0000458 MangleCtx.mangleCtorBlock(CD, GD.getCtorType(), BD, Out);
Peter Collingbourne14110472011-01-13 18:57:25 +0000459 else if (const CXXDestructorDecl *DD = dyn_cast<CXXDestructorDecl>(D))
Rafael Espindolac4850c22011-02-10 23:59:36 +0000460 MangleCtx.mangleDtorBlock(DD, GD.getDtorType(), BD, Out);
Peter Collingbourne14110472011-01-13 18:57:25 +0000461 else
Rafael Espindolac4850c22011-02-10 23:59:36 +0000462 MangleCtx.mangleBlock(cast<DeclContext>(D), BD, Out);
Anders Carlsson9a8822b2010-06-09 02:36:32 +0000463}
464
Chris Lattner5f9e2722011-07-23 10:55:15 +0000465llvm::GlobalValue *CodeGenModule::GetGlobalValue(StringRef Name) {
John McCallf746aa62010-03-19 23:29:14 +0000466 return getModule().getNamedValue(Name);
Douglas Gregor5f2bfd42009-02-13 00:10:09 +0000467}
468
Chris Lattner6d397602008-03-14 17:18:18 +0000469/// AddGlobalCtor - Add a function to the list that will be called before
470/// main() runs.
Daniel Dunbar6bfed7e2008-08-01 00:01:51 +0000471void CodeGenModule::AddGlobalCtor(llvm::Function * Ctor, int Priority) {
Daniel Dunbar49988882009-01-13 02:25:00 +0000472 // FIXME: Type coercion of void()* types.
Daniel Dunbar6bfed7e2008-08-01 00:01:51 +0000473 GlobalCtors.push_back(std::make_pair(Ctor, Priority));
Chris Lattner6d397602008-03-14 17:18:18 +0000474}
475
Daniel Dunbar6bfed7e2008-08-01 00:01:51 +0000476/// AddGlobalDtor - Add a function to the list that will be called
477/// when the module is unloaded.
478void CodeGenModule::AddGlobalDtor(llvm::Function * Dtor, int Priority) {
Daniel Dunbar49988882009-01-13 02:25:00 +0000479 // FIXME: Type coercion of void()* types.
Daniel Dunbar6bfed7e2008-08-01 00:01:51 +0000480 GlobalDtors.push_back(std::make_pair(Dtor, Priority));
481}
482
483void CodeGenModule::EmitCtorList(const CtorList &Fns, const char *GlobalName) {
484 // Ctor function type is void()*.
John McCall0774cb82011-05-15 01:53:33 +0000485 llvm::FunctionType* CtorFTy = llvm::FunctionType::get(VoidTy, false);
Owen Anderson96e0fc72009-07-29 22:16:19 +0000486 llvm::Type *CtorPFTy = llvm::PointerType::getUnqual(CtorFTy);
Daniel Dunbar6bfed7e2008-08-01 00:01:51 +0000487
488 // Get the type of a ctor entry, { i32, void ()* }.
Chris Lattnerc5cbb902011-06-20 04:01:35 +0000489 llvm::StructType *CtorStructTy =
Chris Lattner8b418682012-02-07 00:39:47 +0000490 llvm::StructType::get(Int32Ty, llvm::PointerType::getUnqual(CtorFTy), NULL);
Chris Lattner6d397602008-03-14 17:18:18 +0000491
Daniel Dunbar6bfed7e2008-08-01 00:01:51 +0000492 // Construct the constructor and destructor arrays.
Chris Lattner0b239712012-02-06 22:16:34 +0000493 SmallVector<llvm::Constant*, 8> Ctors;
Daniel Dunbar6bfed7e2008-08-01 00:01:51 +0000494 for (CtorList::const_iterator I = Fns.begin(), E = Fns.end(); I != E; ++I) {
Chris Lattner0b239712012-02-06 22:16:34 +0000495 llvm::Constant *S[] = {
496 llvm::ConstantInt::get(Int32Ty, I->second, false),
497 llvm::ConstantExpr::getBitCast(I->first, CtorPFTy)
498 };
Owen Anderson08e25242009-07-27 22:29:56 +0000499 Ctors.push_back(llvm::ConstantStruct::get(CtorStructTy, S));
Chris Lattner6d397602008-03-14 17:18:18 +0000500 }
Daniel Dunbar6bfed7e2008-08-01 00:01:51 +0000501
502 if (!Ctors.empty()) {
Owen Anderson96e0fc72009-07-29 22:16:19 +0000503 llvm::ArrayType *AT = llvm::ArrayType::get(CtorStructTy, Ctors.size());
Owen Anderson1c431b32009-07-08 19:05:04 +0000504 new llvm::GlobalVariable(TheModule, AT, false,
Daniel Dunbar6bfed7e2008-08-01 00:01:51 +0000505 llvm::GlobalValue::AppendingLinkage,
Owen Anderson7db6d832009-07-28 18:33:04 +0000506 llvm::ConstantArray::get(AT, Ctors),
Owen Anderson1c431b32009-07-08 19:05:04 +0000507 GlobalName);
Daniel Dunbar6bfed7e2008-08-01 00:01:51 +0000508 }
Chris Lattner6d397602008-03-14 17:18:18 +0000509}
510
John McCalld46f9852010-02-19 01:32:20 +0000511llvm::GlobalValue::LinkageTypes
Peter Collingbourne144a31f2013-06-05 17:49:37 +0000512CodeGenModule::getFunctionLinkage(GlobalDecl GD) {
513 const FunctionDecl *D = cast<FunctionDecl>(GD.getDecl());
Argyrios Kyrtzidis90e99a82010-07-29 18:15:58 +0000514 GVALinkage Linkage = getContext().GetGVALinkageForFunction(D);
Daniel Dunbar7c65e992009-04-14 08:05:55 +0000515
Chris Lattnerf81530652010-06-30 16:58:07 +0000516 if (Linkage == GVA_Internal)
John McCalld46f9852010-02-19 01:32:20 +0000517 return llvm::Function::InternalLinkage;
Chris Lattnerf81530652010-06-30 16:58:07 +0000518
519 if (D->hasAttr<DLLExportAttr>())
John McCalld46f9852010-02-19 01:32:20 +0000520 return llvm::Function::DLLExportLinkage;
Chris Lattnerf81530652010-06-30 16:58:07 +0000521
522 if (D->hasAttr<WeakAttr>())
John McCalld46f9852010-02-19 01:32:20 +0000523 return llvm::Function::WeakAnyLinkage;
Chris Lattnerf81530652010-06-30 16:58:07 +0000524
525 // In C99 mode, 'inline' functions are guaranteed to have a strong
526 // definition somewhere else, so we can use available_externally linkage.
527 if (Linkage == GVA_C99Inline)
Fariborz Jahanianfd0f89d2011-02-04 00:08:13 +0000528 return llvm::Function::AvailableExternallyLinkage;
John McCall5584d912011-09-19 18:05:26 +0000529
530 // Note that Apple's kernel linker doesn't support symbol
531 // coalescing, so we need to avoid linkonce and weak linkages there.
532 // Normally, this means we just map to internal, but for explicit
533 // instantiations we'll map to external.
534
Chris Lattnerf81530652010-06-30 16:58:07 +0000535 // In C++, the compiler has to emit a definition in every translation unit
536 // that references the function. We should use linkonce_odr because
537 // a) if all references in this translation unit are optimized away, we
538 // don't need to codegen it. b) if the function persists, it needs to be
539 // merged with other definitions. c) C++ has the ODR, so we know the
540 // definition is dependable.
541 if (Linkage == GVA_CXXInline || Linkage == GVA_TemplateInstantiation)
David Blaikie4e4d0842012-03-11 07:00:24 +0000542 return !Context.getLangOpts().AppleKext
Fariborz Jahanian142f9e92011-02-04 00:01:24 +0000543 ? llvm::Function::LinkOnceODRLinkage
544 : llvm::Function::InternalLinkage;
Chris Lattnerf81530652010-06-30 16:58:07 +0000545
546 // An explicit instantiation of a template has weak linkage, since
547 // explicit instantiations can occur in multiple translation units
548 // and must all be equivalent. However, we are not allowed to
549 // throw away these explicit instantiations.
550 if (Linkage == GVA_ExplicitTemplateInstantiation)
David Blaikie4e4d0842012-03-11 07:00:24 +0000551 return !Context.getLangOpts().AppleKext
Fariborz Jahanian142f9e92011-02-04 00:01:24 +0000552 ? llvm::Function::WeakODRLinkage
John McCall5584d912011-09-19 18:05:26 +0000553 : llvm::Function::ExternalLinkage;
Chris Lattnerf81530652010-06-30 16:58:07 +0000554
555 // Otherwise, we have strong external linkage.
556 assert(Linkage == GVA_StrongExternal);
557 return llvm::Function::ExternalLinkage;
John McCalld46f9852010-02-19 01:32:20 +0000558}
Nuno Lopesd4cbda62008-06-08 15:45:52 +0000559
John McCalld46f9852010-02-19 01:32:20 +0000560
561/// SetFunctionDefinitionAttributes - Set attributes for a global.
562///
563/// FIXME: This is currently only done for aliases and functions, but not for
564/// variables (these details are set in EmitGlobalVarDefinition for variables).
565void CodeGenModule::SetFunctionDefinitionAttributes(const FunctionDecl *D,
566 llvm::GlobalValue *GV) {
Daniel Dunbar7c65e992009-04-14 08:05:55 +0000567 SetCommonAttributes(D, GV);
Nuno Lopesd4cbda62008-06-08 15:45:52 +0000568}
569
Daniel Dunbar7dbd8192009-04-14 07:08:30 +0000570void CodeGenModule::SetLLVMFunctionAttributes(const Decl *D,
Mike Stump1eb44332009-09-09 15:08:12 +0000571 const CGFunctionInfo &Info,
Daniel Dunbar7dbd8192009-04-14 07:08:30 +0000572 llvm::Function *F) {
Daniel Dunbarca6408c2009-09-12 00:59:20 +0000573 unsigned CallingConv;
Devang Patel761d7f72008-09-25 21:02:23 +0000574 AttributeListType AttributeList;
Bill Wendling94236e72013-02-22 00:13:35 +0000575 ConstructAttributeList(Info, D, AttributeList, CallingConv, false);
Bill Wendling785b7782012-12-07 23:17:26 +0000576 F->setAttributes(llvm::AttributeSet::get(getLLVMContext(), AttributeList));
Daniel Dunbarca6408c2009-09-12 00:59:20 +0000577 F->setCallingConv(static_cast<llvm::CallingConv::ID>(CallingConv));
Daniel Dunbarf80519b2008-09-04 23:41:35 +0000578}
579
John McCalld1e40d52011-10-02 01:16:38 +0000580/// Determines whether the language options require us to model
581/// unwind exceptions. We treat -fexceptions as mandating this
582/// except under the fragile ObjC ABI with only ObjC exceptions
583/// enabled. This means, for example, that C with -fexceptions
584/// enables this.
David Blaikie4e4d0842012-03-11 07:00:24 +0000585static bool hasUnwindExceptions(const LangOptions &LangOpts) {
John McCalld1e40d52011-10-02 01:16:38 +0000586 // If exceptions are completely disabled, obviously this is false.
David Blaikie4e4d0842012-03-11 07:00:24 +0000587 if (!LangOpts.Exceptions) return false;
John McCalld1e40d52011-10-02 01:16:38 +0000588
589 // If C++ exceptions are enabled, this is true.
David Blaikie4e4d0842012-03-11 07:00:24 +0000590 if (LangOpts.CXXExceptions) return true;
John McCalld1e40d52011-10-02 01:16:38 +0000591
592 // If ObjC exceptions are enabled, this depends on the ABI.
David Blaikie4e4d0842012-03-11 07:00:24 +0000593 if (LangOpts.ObjCExceptions) {
David Chisnall11d3f4c2012-07-03 20:49:52 +0000594 return LangOpts.ObjCRuntime.hasUnwindExceptions();
John McCalld1e40d52011-10-02 01:16:38 +0000595 }
596
597 return true;
598}
599
Daniel Dunbar7c65e992009-04-14 08:05:55 +0000600void CodeGenModule::SetLLVMFunctionAttributesForDefinition(const Decl *D,
601 llvm::Function *F) {
Benjamin Kramer06a9d042013-05-11 12:45:37 +0000602 llvm::AttrBuilder B;
603
Rafael Espindolaabca5a12011-05-25 03:44:55 +0000604 if (CodeGenOpts.UnwindTables)
Benjamin Kramer06a9d042013-05-11 12:45:37 +0000605 B.addAttribute(llvm::Attribute::UWTable);
Rafael Espindolaabca5a12011-05-25 03:44:55 +0000606
David Blaikie4e4d0842012-03-11 07:00:24 +0000607 if (!hasUnwindExceptions(LangOpts))
Benjamin Kramer06a9d042013-05-11 12:45:37 +0000608 B.addAttribute(llvm::Attribute::NoUnwind);
Daniel Dunbaraf668b02008-10-28 00:17:57 +0000609
Eli Friedman2873aee2011-08-22 23:55:33 +0000610 if (D->hasAttr<NakedAttr>()) {
611 // Naked implies noinline: we should not be inlining such functions.
Benjamin Kramer06a9d042013-05-11 12:45:37 +0000612 B.addAttribute(llvm::Attribute::Naked);
613 B.addAttribute(llvm::Attribute::NoInline);
614 } else if (D->hasAttr<NoInlineAttr>()) {
615 B.addAttribute(llvm::Attribute::NoInline);
616 } else if ((D->hasAttr<AlwaysInlineAttr>() ||
617 D->hasAttr<ForceInlineAttr>()) &&
618 !F->getAttributes().hasAttribute(llvm::AttributeSet::FunctionIndex,
619 llvm::Attribute::NoInline)) {
620 // (noinline wins over always_inline, and we can't specify both in IR)
621 B.addAttribute(llvm::Attribute::AlwaysInline);
Eli Friedman2873aee2011-08-22 23:55:33 +0000622 }
Daniel Dunbardd0cb222010-09-29 18:20:25 +0000623
Diego Novillod27e5cb2013-05-24 20:18:15 +0000624 if (D->hasAttr<ColdAttr>()) {
Benjamin Kramer06a9d042013-05-11 12:45:37 +0000625 B.addAttribute(llvm::Attribute::OptimizeForSize);
Diego Novillod27e5cb2013-05-24 20:18:15 +0000626 B.addAttribute(llvm::Attribute::Cold);
627 }
Benjamin Krameree409a92012-05-12 21:10:52 +0000628
Quentin Colombetaee56fa2012-11-01 23:55:47 +0000629 if (D->hasAttr<MinSizeAttr>())
Benjamin Kramer06a9d042013-05-11 12:45:37 +0000630 B.addAttribute(llvm::Attribute::MinSize);
Richard Smithef4d5ce2012-09-28 22:46:07 +0000631
David Blaikie4e4d0842012-03-11 07:00:24 +0000632 if (LangOpts.getStackProtector() == LangOptions::SSPOn)
Benjamin Kramer06a9d042013-05-11 12:45:37 +0000633 B.addAttribute(llvm::Attribute::StackProtect);
David Blaikie4e4d0842012-03-11 07:00:24 +0000634 else if (LangOpts.getStackProtector() == LangOptions::SSPReq)
Benjamin Kramer06a9d042013-05-11 12:45:37 +0000635 B.addAttribute(llvm::Attribute::StackProtectReq);
Will Dietz4f45bc02013-01-18 11:30:38 +0000636
Alexey Samsonov7e73f942013-03-06 10:54:18 +0000637 // Add sanitizer attributes if function is not blacklisted.
638 if (!SanitizerBlacklist.isIn(*F)) {
639 // When AddressSanitizer is enabled, set SanitizeAddress attribute
640 // unless __attribute__((no_sanitize_address)) is used.
641 if (SanOpts.Address && !D->hasAttr<NoSanitizeAddressAttr>())
Benjamin Kramer06a9d042013-05-11 12:45:37 +0000642 B.addAttribute(llvm::Attribute::SanitizeAddress);
Alexey Samsonov7e73f942013-03-06 10:54:18 +0000643 // Same for ThreadSanitizer and __attribute__((no_sanitize_thread))
644 if (SanOpts.Thread && !D->hasAttr<NoSanitizeThreadAttr>()) {
Benjamin Kramer06a9d042013-05-11 12:45:37 +0000645 B.addAttribute(llvm::Attribute::SanitizeThread);
Alexey Samsonov7e73f942013-03-06 10:54:18 +0000646 }
647 // Same for MemorySanitizer and __attribute__((no_sanitize_memory))
648 if (SanOpts.Memory && !D->hasAttr<NoSanitizeMemoryAttr>())
Benjamin Kramer06a9d042013-05-11 12:45:37 +0000649 B.addAttribute(llvm::Attribute::SanitizeMemory);
Alexey Samsonov7e73f942013-03-06 10:54:18 +0000650 }
Alexander Potapenko89651ea2012-02-02 11:49:28 +0000651
Benjamin Kramer06a9d042013-05-11 12:45:37 +0000652 F->addAttributes(llvm::AttributeSet::FunctionIndex,
653 llvm::AttributeSet::get(
654 F->getContext(), llvm::AttributeSet::FunctionIndex, B));
655
656 if (isa<CXXConstructorDecl>(D) || isa<CXXDestructorDecl>(D))
657 F->setUnnamedAddr(true);
658 else if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D))
659 if (MD->isVirtual())
660 F->setUnnamedAddr(true);
661
Sean Huntcf807c42010-08-18 23:23:40 +0000662 unsigned alignment = D->getMaxAlignment() / Context.getCharWidth();
663 if (alignment)
664 F->setAlignment(alignment);
665
Mike Stumpfb51ddf2009-10-05 22:49:20 +0000666 // C++ ABI requires 2-byte alignment for member functions.
Mike Stumpbd6dbd12009-10-05 23:08:21 +0000667 if (F->getAlignment() < 2 && isa<CXXMethodDecl>(D))
668 F->setAlignment(2);
Daniel Dunbarf80519b2008-09-04 23:41:35 +0000669}
670
Mike Stump1eb44332009-09-09 15:08:12 +0000671void CodeGenModule::SetCommonAttributes(const Decl *D,
Daniel Dunbar7c65e992009-04-14 08:05:55 +0000672 llvm::GlobalValue *GV) {
Anders Carlsson934176f2011-01-29 19:41:00 +0000673 if (const NamedDecl *ND = dyn_cast<NamedDecl>(D))
674 setGlobalVisibility(GV, ND);
John McCall1fb0caa2010-10-22 21:05:15 +0000675 else
676 GV->setVisibility(llvm::GlobalValue::DefaultVisibility);
Daniel Dunbar7c65e992009-04-14 08:05:55 +0000677
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +0000678 if (D->hasAttr<UsedAttr>())
Daniel Dunbar7c65e992009-04-14 08:05:55 +0000679 AddUsedGlobal(GV);
680
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +0000681 if (const SectionAttr *SA = D->getAttr<SectionAttr>())
Daniel Dunbar7c65e992009-04-14 08:05:55 +0000682 GV->setSection(SA->getName());
Anton Korobeynikov82d0a412010-01-10 12:58:08 +0000683
Rafael Espindola9a2f5d72013-03-19 15:03:47 +0000684 // Alias cannot have attributes. Filter them here.
685 if (!isa<llvm::GlobalAlias>(GV))
686 getTargetCodeGenInfo().SetTargetAttributes(D, GV, *this);
Daniel Dunbar7c65e992009-04-14 08:05:55 +0000687}
688
Daniel Dunbar0e4f40e2009-04-17 00:48:04 +0000689void CodeGenModule::SetInternalFunctionAttributes(const Decl *D,
690 llvm::Function *F,
691 const CGFunctionInfo &FI) {
692 SetLLVMFunctionAttributes(D, FI, F);
693 SetLLVMFunctionAttributesForDefinition(D, F);
Daniel Dunbar7c65e992009-04-14 08:05:55 +0000694
695 F->setLinkage(llvm::Function::InternalLinkage);
696
Daniel Dunbar0e4f40e2009-04-17 00:48:04 +0000697 SetCommonAttributes(D, F);
Daniel Dunbarf80519b2008-09-04 23:41:35 +0000698}
699
Anders Carlssonb2bcf1c2010-02-06 02:44:09 +0000700void CodeGenModule::SetFunctionAttributes(GlobalDecl GD,
Eli Friedmanc6c14d12009-05-26 01:22:57 +0000701 llvm::Function *F,
702 bool IsIncompleteFunction) {
Peter Collingbourne0ac2cf42011-04-06 12:29:04 +0000703 if (unsigned IID = F->getIntrinsicID()) {
704 // If this is an intrinsic function, set the function's attributes
705 // to the intrinsic's attributes.
Bill Wendling50e6b182012-10-15 04:47:45 +0000706 F->setAttributes(llvm::Intrinsic::getAttributes(getLLVMContext(),
707 (llvm::Intrinsic::ID)IID));
Peter Collingbourne0ac2cf42011-04-06 12:29:04 +0000708 return;
709 }
710
Anders Carlssonb2bcf1c2010-02-06 02:44:09 +0000711 const FunctionDecl *FD = cast<FunctionDecl>(GD.getDecl());
712
Eli Friedmanc6c14d12009-05-26 01:22:57 +0000713 if (!IsIncompleteFunction)
John McCallde5d3c72012-02-17 03:33:10 +0000714 SetLLVMFunctionAttributes(FD, getTypes().arrangeGlobalDeclaration(GD), F);
Mike Stump1eb44332009-09-09 15:08:12 +0000715
Daniel Dunbar7c65e992009-04-14 08:05:55 +0000716 // Only a few attributes are set on declarations; these may later be
717 // overridden by a definition.
Mike Stump1eb44332009-09-09 15:08:12 +0000718
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +0000719 if (FD->hasAttr<DLLImportAttr>()) {
Daniel Dunbar7c65e992009-04-14 08:05:55 +0000720 F->setLinkage(llvm::Function::DLLImportLinkage);
Mike Stump1eb44332009-09-09 15:08:12 +0000721 } else if (FD->hasAttr<WeakAttr>() ||
Douglas Gregor0a0d2b12011-03-23 00:50:03 +0000722 FD->isWeakImported()) {
Daniel Dunbar7c65e992009-04-14 08:05:55 +0000723 // "extern_weak" is overloaded in LLVM; we probably should have
Mike Stump1eb44332009-09-09 15:08:12 +0000724 // separate linkage types for this.
Daniel Dunbar7c65e992009-04-14 08:05:55 +0000725 F->setLinkage(llvm::Function::ExternalWeakLinkage);
726 } else {
Mike Stump1eb44332009-09-09 15:08:12 +0000727 F->setLinkage(llvm::Function::ExternalLinkage);
John McCallaf146032010-10-30 11:50:40 +0000728
Rafael Espindola2beda122013-02-27 02:15:29 +0000729 LinkageInfo LV = FD->getLinkageAndVisibility();
Rafael Espindolaf127eb82013-02-27 02:56:45 +0000730 if (LV.getLinkage() == ExternalLinkage && LV.isVisibilityExplicit()) {
731 F->setVisibility(GetLLVMVisibility(LV.getVisibility()));
John McCallaf146032010-10-30 11:50:40 +0000732 }
Daniel Dunbar7c65e992009-04-14 08:05:55 +0000733 }
734
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +0000735 if (const SectionAttr *SA = FD->getAttr<SectionAttr>())
Daniel Dunbar7c65e992009-04-14 08:05:55 +0000736 F->setSection(SA->getName());
Daniel Dunbar219df662008-09-08 23:44:31 +0000737}
738
Daniel Dunbar02698712009-02-13 20:29:50 +0000739void CodeGenModule::AddUsedGlobal(llvm::GlobalValue *GV) {
Mike Stump1eb44332009-09-09 15:08:12 +0000740 assert(!GV->isDeclaration() &&
Daniel Dunbar02698712009-02-13 20:29:50 +0000741 "Only globals with definition can force usage.");
Chris Lattner35f38a22009-03-31 22:37:52 +0000742 LLVMUsed.push_back(GV);
Daniel Dunbar02698712009-02-13 20:29:50 +0000743}
744
745void CodeGenModule::EmitLLVMUsed() {
746 // Don't create llvm.used if there is no need.
Chris Lattnerad64e022009-07-17 23:57:13 +0000747 if (LLVMUsed.empty())
Daniel Dunbar02698712009-02-13 20:29:50 +0000748 return;
749
Chris Lattner35f38a22009-03-31 22:37:52 +0000750 // Convert LLVMUsed to what ConstantArray needs.
Chris Lattner0b239712012-02-06 22:16:34 +0000751 SmallVector<llvm::Constant*, 8> UsedArray;
Chris Lattner35f38a22009-03-31 22:37:52 +0000752 UsedArray.resize(LLVMUsed.size());
753 for (unsigned i = 0, e = LLVMUsed.size(); i != e; ++i) {
Mike Stump1eb44332009-09-09 15:08:12 +0000754 UsedArray[i] =
755 llvm::ConstantExpr::getBitCast(cast<llvm::Constant>(&*LLVMUsed[i]),
Chris Lattner0b239712012-02-06 22:16:34 +0000756 Int8PtrTy);
Chris Lattner35f38a22009-03-31 22:37:52 +0000757 }
Mike Stump1eb44332009-09-09 15:08:12 +0000758
Fariborz Jahanianc38e9af2009-06-23 21:47:46 +0000759 if (UsedArray.empty())
760 return;
Chris Lattner0b239712012-02-06 22:16:34 +0000761 llvm::ArrayType *ATy = llvm::ArrayType::get(Int8PtrTy, UsedArray.size());
Mike Stump1eb44332009-09-09 15:08:12 +0000762
763 llvm::GlobalVariable *GV =
764 new llvm::GlobalVariable(getModule(), ATy, false,
Daniel Dunbar02698712009-02-13 20:29:50 +0000765 llvm::GlobalValue::AppendingLinkage,
Owen Anderson7db6d832009-07-28 18:33:04 +0000766 llvm::ConstantArray::get(ATy, UsedArray),
Owen Anderson1c431b32009-07-08 19:05:04 +0000767 "llvm.used");
Daniel Dunbar02698712009-02-13 20:29:50 +0000768
769 GV->setSection("llvm.metadata");
770}
771
Reid Kleckner3190ca92013-05-08 13:44:39 +0000772void CodeGenModule::AppendLinkerOptions(StringRef Opts) {
773 llvm::Value *MDOpts = llvm::MDString::get(getLLVMContext(), Opts);
774 LinkerOptionsMetadata.push_back(llvm::MDNode::get(getLLVMContext(), MDOpts));
775}
776
Aaron Ballmana7ff62f2013-06-04 02:07:14 +0000777void CodeGenModule::AddDetectMismatch(StringRef Name, StringRef Value) {
778 llvm::SmallString<32> Opt;
779 getTargetCodeGenInfo().getDetectMismatchOption(Name, Value, Opt);
780 llvm::Value *MDOpts = llvm::MDString::get(getLLVMContext(), Opt);
781 LinkerOptionsMetadata.push_back(llvm::MDNode::get(getLLVMContext(), MDOpts));
782}
783
Reid Kleckner3190ca92013-05-08 13:44:39 +0000784void CodeGenModule::AddDependentLib(StringRef Lib) {
785 llvm::SmallString<24> Opt;
786 getTargetCodeGenInfo().getDependentLibraryOption(Lib, Opt);
787 llvm::Value *MDOpts = llvm::MDString::get(getLLVMContext(), Opt);
788 LinkerOptionsMetadata.push_back(llvm::MDNode::get(getLLVMContext(), MDOpts));
789}
790
Douglas Gregor858afb32013-01-14 20:53:57 +0000791/// \brief Add link options implied by the given module, including modules
792/// it depends on, using a postorder walk.
Reid Kleckner3190ca92013-05-08 13:44:39 +0000793static void addLinkOptionsPostorder(CodeGenModule &CGM,
Douglas Gregor858afb32013-01-14 20:53:57 +0000794 Module *Mod,
Daniel Dunbarf9d03c12013-01-17 01:35:06 +0000795 SmallVectorImpl<llvm::Value *> &Metadata,
Douglas Gregor858afb32013-01-14 20:53:57 +0000796 llvm::SmallPtrSet<Module *, 16> &Visited) {
797 // Import this module's parent.
798 if (Mod->Parent && Visited.insert(Mod->Parent)) {
Reid Kleckner3190ca92013-05-08 13:44:39 +0000799 addLinkOptionsPostorder(CGM, Mod->Parent, Metadata, Visited);
Douglas Gregor858afb32013-01-14 20:53:57 +0000800 }
801
802 // Import this module's dependencies.
803 for (unsigned I = Mod->Imports.size(); I > 0; --I) {
804 if (Visited.insert(Mod->Imports[I-1]))
Reid Kleckner3190ca92013-05-08 13:44:39 +0000805 addLinkOptionsPostorder(CGM, Mod->Imports[I-1], Metadata, Visited);
Douglas Gregor858afb32013-01-14 20:53:57 +0000806 }
807
808 // Add linker options to link against the libraries/frameworks
809 // described by this module.
Reid Kleckner3190ca92013-05-08 13:44:39 +0000810 llvm::LLVMContext &Context = CGM.getLLVMContext();
Douglas Gregor858afb32013-01-14 20:53:57 +0000811 for (unsigned I = Mod->LinkLibraries.size(); I > 0; --I) {
Reid Kleckner3190ca92013-05-08 13:44:39 +0000812 // Link against a framework. Frameworks are currently Darwin only, so we
813 // don't to ask TargetCodeGenInfo for the spelling of the linker option.
Douglas Gregor858afb32013-01-14 20:53:57 +0000814 if (Mod->LinkLibraries[I-1].IsFramework) {
815 llvm::Value *Args[2] = {
816 llvm::MDString::get(Context, "-framework"),
817 llvm::MDString::get(Context, Mod->LinkLibraries[I-1].Library)
818 };
819
820 Metadata.push_back(llvm::MDNode::get(Context, Args));
821 continue;
822 }
823
824 // Link against a library.
Reid Kleckner3190ca92013-05-08 13:44:39 +0000825 llvm::SmallString<24> Opt;
826 CGM.getTargetCodeGenInfo().getDependentLibraryOption(
827 Mod->LinkLibraries[I-1].Library, Opt);
828 llvm::Value *OptString = llvm::MDString::get(Context, Opt);
Douglas Gregor858afb32013-01-14 20:53:57 +0000829 Metadata.push_back(llvm::MDNode::get(Context, OptString));
830 }
831}
832
833void CodeGenModule::EmitModuleLinkOptions() {
834 // Collect the set of all of the modules we want to visit to emit link
835 // options, which is essentially the imported modules and all of their
836 // non-explicit child modules.
837 llvm::SetVector<clang::Module *> LinkModules;
838 llvm::SmallPtrSet<clang::Module *, 16> Visited;
839 SmallVector<clang::Module *, 16> Stack;
840
841 // Seed the stack with imported modules.
842 for (llvm::SetVector<clang::Module *>::iterator M = ImportedModules.begin(),
843 MEnd = ImportedModules.end();
844 M != MEnd; ++M) {
845 if (Visited.insert(*M))
846 Stack.push_back(*M);
847 }
848
849 // Find all of the modules to import, making a little effort to prune
850 // non-leaf modules.
851 while (!Stack.empty()) {
852 clang::Module *Mod = Stack.back();
853 Stack.pop_back();
854
855 bool AnyChildren = false;
856
857 // Visit the submodules of this module.
858 for (clang::Module::submodule_iterator Sub = Mod->submodule_begin(),
859 SubEnd = Mod->submodule_end();
860 Sub != SubEnd; ++Sub) {
861 // Skip explicit children; they need to be explicitly imported to be
862 // linked against.
863 if ((*Sub)->IsExplicit)
864 continue;
865
866 if (Visited.insert(*Sub)) {
867 Stack.push_back(*Sub);
868 AnyChildren = true;
869 }
870 }
871
872 // We didn't find any children, so add this module to the list of
873 // modules to link against.
874 if (!AnyChildren) {
875 LinkModules.insert(Mod);
876 }
877 }
878
879 // Add link options for all of the imported modules in reverse topological
Reid Kleckner3190ca92013-05-08 13:44:39 +0000880 // order. We don't do anything to try to order import link flags with respect
881 // to linker options inserted by things like #pragma comment().
Daniel Dunbarf9d03c12013-01-17 01:35:06 +0000882 SmallVector<llvm::Value *, 16> MetadataArgs;
Douglas Gregor858afb32013-01-14 20:53:57 +0000883 Visited.clear();
884 for (llvm::SetVector<clang::Module *>::iterator M = LinkModules.begin(),
885 MEnd = LinkModules.end();
886 M != MEnd; ++M) {
887 if (Visited.insert(*M))
Reid Kleckner3190ca92013-05-08 13:44:39 +0000888 addLinkOptionsPostorder(*this, *M, MetadataArgs, Visited);
Douglas Gregor858afb32013-01-14 20:53:57 +0000889 }
Daniel Dunbarf9d03c12013-01-17 01:35:06 +0000890 std::reverse(MetadataArgs.begin(), MetadataArgs.end());
Reid Kleckner3190ca92013-05-08 13:44:39 +0000891 LinkerOptionsMetadata.append(MetadataArgs.begin(), MetadataArgs.end());
Douglas Gregor858afb32013-01-14 20:53:57 +0000892
Daniel Dunbarf9d03c12013-01-17 01:35:06 +0000893 // Add the linker options metadata flag.
894 getModule().addModuleFlag(llvm::Module::AppendUnique, "Linker Options",
Reid Kleckner3190ca92013-05-08 13:44:39 +0000895 llvm::MDNode::get(getLLVMContext(),
896 LinkerOptionsMetadata));
Douglas Gregor858afb32013-01-14 20:53:57 +0000897}
898
Daniel Dunbar02698712009-02-13 20:29:50 +0000899void CodeGenModule::EmitDeferred() {
Chris Lattner67b00522009-03-21 09:44:56 +0000900 // Emit code for any potentially referenced deferred decls. Since a
901 // previously unused static decl may become used during the generation of code
Nick Lewyckydce67a72011-07-18 05:26:13 +0000902 // for a static function, iterate until no changes are made.
Rafael Espindolabbf58bb2010-03-10 02:19:29 +0000903
John McCalld5617ee2013-01-25 22:31:03 +0000904 while (true) {
Anders Carlsson046c2942010-04-17 20:15:18 +0000905 if (!DeferredVTables.empty()) {
John McCalld5617ee2013-01-25 22:31:03 +0000906 EmitDeferredVTables();
907
908 // Emitting a v-table doesn't directly cause more v-tables to
909 // become deferred, although it can cause functions to be
910 // emitted that then need those v-tables.
911 assert(DeferredVTables.empty());
Rafael Espindolabbf58bb2010-03-10 02:19:29 +0000912 }
913
John McCalld5617ee2013-01-25 22:31:03 +0000914 // Stop if we're out of both deferred v-tables and deferred declarations.
915 if (DeferredDeclsToEmit.empty()) break;
916
Anders Carlsson2a131fb2009-05-05 04:44:02 +0000917 GlobalDecl D = DeferredDeclsToEmit.back();
Chris Lattner67b00522009-03-21 09:44:56 +0000918 DeferredDeclsToEmit.pop_back();
919
John McCallc76702c2010-05-27 01:45:30 +0000920 // Check to see if we've already emitted this. This is necessary
921 // for a couple of reasons: first, decls can end up in the
922 // deferred-decls queue multiple times, and second, decls can end
923 // up with definitions in unusual ways (e.g. by an extern inline
924 // function acquiring a strong function redefinition). Just
925 // ignore these cases.
926 //
927 // TODO: That said, looking this up multiple times is very wasteful.
Chris Lattner5f9e2722011-07-23 10:55:15 +0000928 StringRef Name = getMangledName(D);
John McCallf746aa62010-03-19 23:29:14 +0000929 llvm::GlobalValue *CGRef = GetGlobalValue(Name);
Chris Lattner67b00522009-03-21 09:44:56 +0000930 assert(CGRef && "Deferred decl wasn't referenced?");
Mike Stump1eb44332009-09-09 15:08:12 +0000931
Chris Lattner67b00522009-03-21 09:44:56 +0000932 if (!CGRef->isDeclaration())
933 continue;
Mike Stump1eb44332009-09-09 15:08:12 +0000934
John McCallc76702c2010-05-27 01:45:30 +0000935 // GlobalAlias::isDeclaration() defers to the aliasee, but for our
936 // purposes an alias counts as a definition.
937 if (isa<llvm::GlobalAlias>(CGRef))
938 continue;
939
Chris Lattner67b00522009-03-21 09:44:56 +0000940 // Otherwise, emit the definition and move on to the next one.
941 EmitGlobalDefinition(D);
942 }
Reid Spencer5f016e22007-07-11 17:01:13 +0000943}
944
Julien Lerouge77f68bb2011-09-09 22:41:49 +0000945void CodeGenModule::EmitGlobalAnnotations() {
946 if (Annotations.empty())
947 return;
948
949 // Create a new global variable for the ConstantStruct in the Module.
950 llvm::Constant *Array = llvm::ConstantArray::get(llvm::ArrayType::get(
951 Annotations[0]->getType(), Annotations.size()), Annotations);
952 llvm::GlobalValue *gv = new llvm::GlobalVariable(getModule(),
953 Array->getType(), false, llvm::GlobalValue::AppendingLinkage, Array,
954 "llvm.global.annotations");
955 gv->setSection(AnnotationSection);
956}
957
Dmitri Gribenkocfa88f82013-01-12 19:30:44 +0000958llvm::Constant *CodeGenModule::EmitAnnotationString(StringRef Str) {
Julien Lerouge77f68bb2011-09-09 22:41:49 +0000959 llvm::StringMap<llvm::Constant*>::iterator i = AnnotationStrings.find(Str);
960 if (i != AnnotationStrings.end())
961 return i->second;
962
963 // Not found yet, create a new global.
Chris Lattner94010692012-02-05 02:30:40 +0000964 llvm::Constant *s = llvm::ConstantDataArray::getString(getLLVMContext(), Str);
Julien Lerouge77f68bb2011-09-09 22:41:49 +0000965 llvm::GlobalValue *gv = new llvm::GlobalVariable(getModule(), s->getType(),
966 true, llvm::GlobalValue::PrivateLinkage, s, ".str");
967 gv->setSection(AnnotationSection);
968 gv->setUnnamedAddr(true);
969 AnnotationStrings[Str] = gv;
970 return gv;
971}
972
973llvm::Constant *CodeGenModule::EmitAnnotationUnit(SourceLocation Loc) {
974 SourceManager &SM = getContext().getSourceManager();
975 PresumedLoc PLoc = SM.getPresumedLoc(Loc);
976 if (PLoc.isValid())
977 return EmitAnnotationString(PLoc.getFilename());
978 return EmitAnnotationString(SM.getBufferName(Loc));
979}
980
981llvm::Constant *CodeGenModule::EmitAnnotationLineNo(SourceLocation L) {
982 SourceManager &SM = getContext().getSourceManager();
983 PresumedLoc PLoc = SM.getPresumedLoc(L);
984 unsigned LineNo = PLoc.isValid() ? PLoc.getLine() :
985 SM.getExpansionLineNumber(L);
986 return llvm::ConstantInt::get(Int32Ty, LineNo);
987}
988
Mike Stump1eb44332009-09-09 15:08:12 +0000989llvm::Constant *CodeGenModule::EmitAnnotateAttr(llvm::GlobalValue *GV,
Nate Begeman8bd4afe2008-04-19 04:17:09 +0000990 const AnnotateAttr *AA,
Julien Lerouge77f68bb2011-09-09 22:41:49 +0000991 SourceLocation L) {
992 // Get the globals for file name, annotation, and the line number.
993 llvm::Constant *AnnoGV = EmitAnnotationString(AA->getAnnotation()),
994 *UnitGV = EmitAnnotationUnit(L),
995 *LineNoCst = EmitAnnotationLineNo(L);
Nate Begeman8bd4afe2008-04-19 04:17:09 +0000996
Daniel Dunbar57d5cee2009-04-14 22:41:13 +0000997 // Create the ConstantStruct for the global annotation.
Nate Begeman8bd4afe2008-04-19 04:17:09 +0000998 llvm::Constant *Fields[4] = {
Julien Lerouge77f68bb2011-09-09 22:41:49 +0000999 llvm::ConstantExpr::getBitCast(GV, Int8PtrTy),
1000 llvm::ConstantExpr::getBitCast(AnnoGV, Int8PtrTy),
1001 llvm::ConstantExpr::getBitCast(UnitGV, Int8PtrTy),
1002 LineNoCst
Nate Begeman8bd4afe2008-04-19 04:17:09 +00001003 };
Chris Lattnerc5cbb902011-06-20 04:01:35 +00001004 return llvm::ConstantStruct::getAnon(Fields);
Nate Begeman8bd4afe2008-04-19 04:17:09 +00001005}
1006
Julien Lerouge77f68bb2011-09-09 22:41:49 +00001007void CodeGenModule::AddGlobalAnnotations(const ValueDecl *D,
1008 llvm::GlobalValue *GV) {
1009 assert(D->hasAttr<AnnotateAttr>() && "no annotate attribute");
1010 // Get the struct elements for these annotations.
1011 for (specific_attr_iterator<AnnotateAttr>
1012 ai = D->specific_attr_begin<AnnotateAttr>(),
1013 ae = D->specific_attr_end<AnnotateAttr>(); ai != ae; ++ai)
1014 Annotations.push_back(EmitAnnotateAttr(GV, *ai, D->getLocation()));
1015}
1016
Argyrios Kyrtzidisa6d6af32010-07-27 22:37:14 +00001017bool CodeGenModule::MayDeferGeneration(const ValueDecl *Global) {
Argyrios Kyrtzidis90e99a82010-07-29 18:15:58 +00001018 // Never defer when EmitAllDecls is specified.
David Blaikie4e4d0842012-03-11 07:00:24 +00001019 if (LangOpts.EmitAllDecls)
Daniel Dunbar73241df2009-02-13 21:18:01 +00001020 return false;
Daniel Dunbarbd012ff2008-07-29 23:18:29 +00001021
Argyrios Kyrtzidis4ac7c0b2010-07-29 20:08:05 +00001022 return !getContext().DeclMustBeEmitted(Global);
Daniel Dunbar73241df2009-02-13 21:18:01 +00001023}
1024
Nico Weberc5f80462012-10-11 10:13:44 +00001025llvm::Constant *CodeGenModule::GetAddrOfUuidDescriptor(
1026 const CXXUuidofExpr* E) {
1027 // Sema has verified that IIDSource has a __declspec(uuid()), and that its
1028 // well-formed.
1029 StringRef Uuid;
1030 if (E->isTypeOperand())
1031 Uuid = CXXUuidofExpr::GetUuidAttrOfType(E->getTypeOperand())->getGuid();
1032 else {
1033 // Special case: __uuidof(0) means an all-zero GUID.
1034 Expr *Op = E->getExprOperand();
1035 if (!Op->isNullPointerConstant(Context, Expr::NPC_ValueDependentIsNull))
1036 Uuid = CXXUuidofExpr::GetUuidAttrOfType(Op->getType())->getGuid();
1037 else
1038 Uuid = "00000000-0000-0000-0000-000000000000";
1039 }
1040 std::string Name = "__uuid_" + Uuid.str();
1041
1042 // Look for an existing global.
1043 if (llvm::GlobalVariable *GV = getModule().getNamedGlobal(Name))
1044 return GV;
1045
1046 llvm::Constant *Init = EmitUuidofInitializer(Uuid, E->getType());
1047 assert(Init && "failed to initialize as constant");
1048
1049 // GUIDs are assumed to be 16 bytes, spread over 4-2-2-8 bytes. However, the
1050 // first field is declared as "long", which for many targets is 8 bytes.
1051 // Those architectures are not supported. (With the MS abi, long is always 4
1052 // bytes.)
1053 llvm::Type *GuidType = getTypes().ConvertType(E->getType());
1054 if (Init->getType() != GuidType) {
1055 DiagnosticsEngine &Diags = getDiags();
1056 unsigned DiagID = Diags.getCustomDiagID(DiagnosticsEngine::Error,
1057 "__uuidof codegen is not supported on this architecture");
1058 Diags.Report(E->getExprLoc(), DiagID) << E->getSourceRange();
1059 Init = llvm::UndefValue::get(GuidType);
1060 }
1061
1062 llvm::GlobalVariable *GV = new llvm::GlobalVariable(getModule(), GuidType,
1063 /*isConstant=*/true, llvm::GlobalValue::PrivateLinkage, Init, Name);
1064 GV->setUnnamedAddr(true);
1065 return GV;
1066}
1067
Rafael Espindola6a836702010-03-04 18:17:24 +00001068llvm::Constant *CodeGenModule::GetWeakRefReference(const ValueDecl *VD) {
1069 const AliasAttr *AA = VD->getAttr<AliasAttr>();
1070 assert(AA && "No alias?");
1071
Chris Lattner2acc6e32011-07-18 04:24:23 +00001072 llvm::Type *DeclTy = getTypes().ConvertTypeForMem(VD->getType());
Rafael Espindola6a836702010-03-04 18:17:24 +00001073
Rafael Espindola6a836702010-03-04 18:17:24 +00001074 // See if there is already something with the target's name in the module.
John McCallf746aa62010-03-19 23:29:14 +00001075 llvm::GlobalValue *Entry = GetGlobalValue(AA->getAliasee());
Joerg Sonnenberger4695f912012-10-16 17:45:27 +00001076 if (Entry) {
1077 unsigned AS = getContext().getTargetAddressSpace(VD->getType());
1078 return llvm::ConstantExpr::getBitCast(Entry, DeclTy->getPointerTo(AS));
1079 }
Rafael Espindola6a836702010-03-04 18:17:24 +00001080
1081 llvm::Constant *Aliasee;
1082 if (isa<llvm::FunctionType>(DeclTy))
Alex Rosenbergc857ce82012-10-05 23:12:53 +00001083 Aliasee = GetOrCreateLLVMFunction(AA->getAliasee(), DeclTy,
1084 GlobalDecl(cast<FunctionDecl>(VD)),
Anders Carlsson1faa89f2011-02-05 04:35:53 +00001085 /*ForVTable=*/false);
Rafael Espindola6a836702010-03-04 18:17:24 +00001086 else
John McCallf746aa62010-03-19 23:29:14 +00001087 Aliasee = GetOrCreateLLVMGlobal(AA->getAliasee(),
Rafael Espindola6a836702010-03-04 18:17:24 +00001088 llvm::PointerType::getUnqual(DeclTy), 0);
Joerg Sonnenberger4695f912012-10-16 17:45:27 +00001089
1090 llvm::GlobalValue* F = cast<llvm::GlobalValue>(Aliasee);
1091 F->setLinkage(llvm::Function::ExternalWeakLinkage);
1092 WeakRefReferences.insert(F);
Rafael Espindola6a836702010-03-04 18:17:24 +00001093
1094 return Aliasee;
1095}
1096
Chris Lattnerb4880ba2009-05-12 21:21:08 +00001097void CodeGenModule::EmitGlobal(GlobalDecl GD) {
Anders Carlsson4a6835e2009-09-10 23:38:47 +00001098 const ValueDecl *Global = cast<ValueDecl>(GD.getDecl());
Mike Stump1eb44332009-09-09 15:08:12 +00001099
Rafael Espindola6a836702010-03-04 18:17:24 +00001100 // Weak references don't produce any output by themselves.
1101 if (Global->hasAttr<WeakRefAttr>())
1102 return;
1103
Chris Lattnerbd532712009-03-22 21:47:11 +00001104 // If this is an alias definition (which otherwise looks like a declaration)
1105 // emit it now.
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +00001106 if (Global->hasAttr<AliasAttr>())
John McCallf746aa62010-03-19 23:29:14 +00001107 return EmitAliasDefinition(GD);
Daniel Dunbar219df662008-09-08 23:44:31 +00001108
Peter Collingbourned51e43a2011-10-06 18:29:46 +00001109 // If this is CUDA, be selective about which declarations we emit.
David Blaikie4e4d0842012-03-11 07:00:24 +00001110 if (LangOpts.CUDA) {
Peter Collingbourned51e43a2011-10-06 18:29:46 +00001111 if (CodeGenOpts.CUDAIsDevice) {
1112 if (!Global->hasAttr<CUDADeviceAttr>() &&
1113 !Global->hasAttr<CUDAGlobalAttr>() &&
1114 !Global->hasAttr<CUDAConstantAttr>() &&
1115 !Global->hasAttr<CUDASharedAttr>())
1116 return;
1117 } else {
1118 if (!Global->hasAttr<CUDAHostAttr>() && (
1119 Global->hasAttr<CUDADeviceAttr>() ||
1120 Global->hasAttr<CUDAConstantAttr>() ||
1121 Global->hasAttr<CUDASharedAttr>()))
1122 return;
1123 }
1124 }
1125
Chris Lattner67b00522009-03-21 09:44:56 +00001126 // Ignore declarations, they will be emitted on their first use.
Daniel Dunbar5e1e1f92009-03-19 08:27:24 +00001127 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(Global)) {
Daniel Dunbar73241df2009-02-13 21:18:01 +00001128 // Forward declarations are emitted lazily on first use.
Nick Lewyckydce67a72011-07-18 05:26:13 +00001129 if (!FD->doesThisDeclarationHaveABody()) {
1130 if (!FD->doesDeclarationForceExternallyVisibleDefinition())
1131 return;
1132
1133 const FunctionDecl *InlineDefinition = 0;
1134 FD->getBody(InlineDefinition);
1135
Chris Lattner5f9e2722011-07-23 10:55:15 +00001136 StringRef MangledName = getMangledName(GD);
Benjamin Kramer7e423922012-03-24 18:22:12 +00001137 DeferredDecls.erase(MangledName);
Nick Lewyckydce67a72011-07-18 05:26:13 +00001138 EmitGlobalDefinition(InlineDefinition);
Daniel Dunbar73241df2009-02-13 21:18:01 +00001139 return;
Nick Lewyckydce67a72011-07-18 05:26:13 +00001140 }
Daniel Dunbar02698712009-02-13 20:29:50 +00001141 } else {
1142 const VarDecl *VD = cast<VarDecl>(Global);
Daniel Dunbarbd012ff2008-07-29 23:18:29 +00001143 assert(VD->isFileVarDecl() && "Cannot emit local var decl as global.");
1144
Douglas Gregora9a55c02010-02-06 05:15:45 +00001145 if (VD->isThisDeclarationADefinition() != VarDecl::Definition)
Douglas Gregorb6c8c8b2009-04-21 17:11:58 +00001146 return;
Nate Begeman4c13b7a2008-04-20 06:29:50 +00001147 }
1148
Chris Lattner67b00522009-03-21 09:44:56 +00001149 // Defer code generation when possible if this is a static definition, inline
1150 // function etc. These we only want to emit if they are used.
Chris Lattner4357a822010-04-13 17:39:09 +00001151 if (!MayDeferGeneration(Global)) {
1152 // Emit the definition if it can't be deferred.
1153 EmitGlobalDefinition(GD);
Daniel Dunbarbd012ff2008-07-29 23:18:29 +00001154 return;
1155 }
John McCallbf40cb52010-07-15 23:40:35 +00001156
1157 // If we're deferring emission of a C++ variable with an
1158 // initializer, remember the order in which it appeared in the file.
David Blaikie4e4d0842012-03-11 07:00:24 +00001159 if (getLangOpts().CPlusPlus && isa<VarDecl>(Global) &&
John McCallbf40cb52010-07-15 23:40:35 +00001160 cast<VarDecl>(Global)->hasInit()) {
1161 DelayedCXXInitPosition[Global] = CXXGlobalInits.size();
1162 CXXGlobalInits.push_back(0);
1163 }
Chris Lattner4357a822010-04-13 17:39:09 +00001164
1165 // If the value has already been used, add it directly to the
1166 // DeferredDeclsToEmit list.
Chris Lattner5f9e2722011-07-23 10:55:15 +00001167 StringRef MangledName = getMangledName(GD);
Chris Lattner4357a822010-04-13 17:39:09 +00001168 if (GetGlobalValue(MangledName))
1169 DeferredDeclsToEmit.push_back(GD);
1170 else {
1171 // Otherwise, remember that we saw a deferred decl with this name. The
1172 // first use of the mangled name will cause it to move into
1173 // DeferredDeclsToEmit.
1174 DeferredDecls[MangledName] = GD;
1175 }
Nate Begeman4c13b7a2008-04-20 06:29:50 +00001176}
1177
Rafael Espindolaa411d2f2011-10-26 20:41:06 +00001178namespace {
1179 struct FunctionIsDirectlyRecursive :
1180 public RecursiveASTVisitor<FunctionIsDirectlyRecursive> {
1181 const StringRef Name;
Rafael Espindolabcf6b982011-12-19 14:41:01 +00001182 const Builtin::Context &BI;
Rafael Espindolaa411d2f2011-10-26 20:41:06 +00001183 bool Result;
Rafael Espindolabcf6b982011-12-19 14:41:01 +00001184 FunctionIsDirectlyRecursive(StringRef N, const Builtin::Context &C) :
1185 Name(N), BI(C), Result(false) {
Rafael Espindolaa411d2f2011-10-26 20:41:06 +00001186 }
1187 typedef RecursiveASTVisitor<FunctionIsDirectlyRecursive> Base;
1188
1189 bool TraverseCallExpr(CallExpr *E) {
Rafael Espindolabcf6b982011-12-19 14:41:01 +00001190 const FunctionDecl *FD = E->getDirectCallee();
1191 if (!FD)
Rafael Espindolaa411d2f2011-10-26 20:41:06 +00001192 return true;
Rafael Espindolabcf6b982011-12-19 14:41:01 +00001193 AsmLabelAttr *Attr = FD->getAttr<AsmLabelAttr>();
1194 if (Attr && Name == Attr->getLabel()) {
1195 Result = true;
1196 return false;
1197 }
1198 unsigned BuiltinID = FD->getBuiltinID();
1199 if (!BuiltinID)
Rafael Espindolaa411d2f2011-10-26 20:41:06 +00001200 return true;
Nick Lewyckyf6b56372012-01-18 03:41:19 +00001201 StringRef BuiltinName = BI.GetName(BuiltinID);
1202 if (BuiltinName.startswith("__builtin_") &&
1203 Name == BuiltinName.slice(strlen("__builtin_"), StringRef::npos)) {
Rafael Espindolaa411d2f2011-10-26 20:41:06 +00001204 Result = true;
1205 return false;
1206 }
1207 return true;
1208 }
1209 };
1210}
1211
Rafael Espindolabcf6b982011-12-19 14:41:01 +00001212// isTriviallyRecursive - Check if this function calls another
1213// decl that, because of the asm attribute or the other decl being a builtin,
1214// ends up pointing to itself.
Rafael Espindolaa411d2f2011-10-26 20:41:06 +00001215bool
Rafael Espindolabcf6b982011-12-19 14:41:01 +00001216CodeGenModule::isTriviallyRecursive(const FunctionDecl *FD) {
1217 StringRef Name;
1218 if (getCXXABI().getMangleContext().shouldMangleDeclName(FD)) {
Nick Lewycky22afacc2012-01-18 01:50:13 +00001219 // asm labels are a special kind of mangling we have to support.
Rafael Espindolabcf6b982011-12-19 14:41:01 +00001220 AsmLabelAttr *Attr = FD->getAttr<AsmLabelAttr>();
1221 if (!Attr)
1222 return false;
1223 Name = Attr->getLabel();
1224 } else {
1225 Name = FD->getName();
1226 }
Rafael Espindolaa411d2f2011-10-26 20:41:06 +00001227
Rafael Espindolabcf6b982011-12-19 14:41:01 +00001228 FunctionIsDirectlyRecursive Walker(Name, Context.BuiltinInfo);
1229 Walker.TraverseFunctionDecl(const_cast<FunctionDecl*>(FD));
Rafael Espindolaa411d2f2011-10-26 20:41:06 +00001230 return Walker.Result;
1231}
1232
1233bool
Peter Collingbourne144a31f2013-06-05 17:49:37 +00001234CodeGenModule::shouldEmitFunction(GlobalDecl GD) {
1235 if (getFunctionLinkage(GD) != llvm::Function::AvailableExternallyLinkage)
Rafael Espindolaa411d2f2011-10-26 20:41:06 +00001236 return true;
Peter Collingbourne144a31f2013-06-05 17:49:37 +00001237 const FunctionDecl *F = cast<FunctionDecl>(GD.getDecl());
Rafael Espindolacc4889f2011-10-28 20:43:56 +00001238 if (CodeGenOpts.OptimizationLevel == 0 &&
Michael J. Spenceradc6cbf2012-06-18 07:00:48 +00001239 !F->hasAttr<AlwaysInlineAttr>() && !F->hasAttr<ForceInlineAttr>())
Rafael Espindolaa411d2f2011-10-26 20:41:06 +00001240 return false;
1241 // PR9614. Avoid cases where the source code is lying to us. An available
1242 // externally function should have an equivalent function somewhere else,
1243 // but a function that calls itself is clearly not equivalent to the real
1244 // implementation.
1245 // This happens in glibc's btowc and in some configure checks.
Rafael Espindolabcf6b982011-12-19 14:41:01 +00001246 return !isTriviallyRecursive(F);
Rafael Espindolaa411d2f2011-10-26 20:41:06 +00001247}
1248
Adrian Prantl0a050f72013-05-09 23:16:27 +00001249/// If the type for the method's class was generated by
1250/// CGDebugInfo::createContextChain(), the cache contains only a
1251/// limited DIType without any declarations. Since EmitFunctionStart()
1252/// needs to find the canonical declaration for each method, we need
1253/// to construct the complete type prior to emitting the method.
1254void CodeGenModule::CompleteDIClassType(const CXXMethodDecl* D) {
1255 if (!D->isInstance())
1256 return;
1257
1258 if (CGDebugInfo *DI = getModuleDebugInfo())
1259 if (getCodeGenOpts().getDebugInfo() >= CodeGenOptions::LimitedDebugInfo) {
1260 const PointerType *ThisPtr =
1261 cast<PointerType>(D->getThisType(getContext()));
1262 DI->getOrCreateRecordType(ThisPtr->getPointeeType(), D->getLocation());
1263 }
1264}
1265
Chris Lattnerb4880ba2009-05-12 21:21:08 +00001266void CodeGenModule::EmitGlobalDefinition(GlobalDecl GD) {
Anders Carlsson4a6835e2009-09-10 23:38:47 +00001267 const ValueDecl *D = cast<ValueDecl>(GD.getDecl());
Mike Stump1eb44332009-09-09 15:08:12 +00001268
Dan Gohmancb421fa2010-04-19 16:39:44 +00001269 PrettyStackTraceDecl CrashInfo(const_cast<ValueDecl *>(D), D->getLocation(),
Anders Carlsson8e2efcc2009-10-27 14:32:27 +00001270 Context.getSourceManager(),
1271 "Generating code for declaration");
1272
Peter Collingbourne144a31f2013-06-05 17:49:37 +00001273 if (isa<FunctionDecl>(D)) {
Douglas Gregor44eac332010-07-13 06:02:28 +00001274 // At -O0, don't generate IR for functions with available_externally
1275 // linkage.
Peter Collingbourne144a31f2013-06-05 17:49:37 +00001276 if (!shouldEmitFunction(GD))
Douglas Gregor44eac332010-07-13 06:02:28 +00001277 return;
Anders Carlsson7270ee42010-03-23 04:31:31 +00001278
Douglas Gregor44eac332010-07-13 06:02:28 +00001279 if (const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) {
Adrian Prantl0a050f72013-05-09 23:16:27 +00001280 CompleteDIClassType(Method);
Eli Friedman7dcdf5b2011-05-06 17:27:27 +00001281 // Make sure to emit the definition(s) before we emit the thunks.
1282 // This is necessary for the generation of certain thunks.
1283 if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(Method))
1284 EmitCXXConstructor(CD, GD.getCtorType());
1285 else if (const CXXDestructorDecl *DD =dyn_cast<CXXDestructorDecl>(Method))
1286 EmitCXXDestructor(DD, GD.getDtorType());
1287 else
1288 EmitGlobalFunctionDefinition(GD);
1289
Douglas Gregor44eac332010-07-13 06:02:28 +00001290 if (Method->isVirtual())
1291 getVTables().EmitThunks(GD);
1292
Eli Friedman7dcdf5b2011-05-06 17:27:27 +00001293 return;
Douglas Gregor44eac332010-07-13 06:02:28 +00001294 }
Chris Lattnerb5e81562010-04-13 17:57:11 +00001295
Chris Lattnerb5e81562010-04-13 17:57:11 +00001296 return EmitGlobalFunctionDefinition(GD);
Douglas Gregor44eac332010-07-13 06:02:28 +00001297 }
Chris Lattnerb5e81562010-04-13 17:57:11 +00001298
1299 if (const VarDecl *VD = dyn_cast<VarDecl>(D))
1300 return EmitGlobalVarDefinition(VD);
Chris Lattner4357a822010-04-13 17:39:09 +00001301
David Blaikieb219cfc2011-09-23 05:06:16 +00001302 llvm_unreachable("Invalid argument to EmitGlobalDefinition()");
Daniel Dunbarbd012ff2008-07-29 23:18:29 +00001303}
1304
Chris Lattner74391b42009-03-22 21:03:39 +00001305/// GetOrCreateLLVMFunction - If the specified mangled name is not in the
1306/// module, create and return an llvm Function with the specified type. If there
1307/// is something in the module with the specified name, return it potentially
1308/// bitcasted to the right type.
1309///
1310/// If D is non-null, it specifies a decl that correspond to this. This is used
1311/// to set the attributes on the function when it is first created.
John McCallf746aa62010-03-19 23:29:14 +00001312llvm::Constant *
Chris Lattner5f9e2722011-07-23 10:55:15 +00001313CodeGenModule::GetOrCreateLLVMFunction(StringRef MangledName,
Chris Lattner2acc6e32011-07-18 04:24:23 +00001314 llvm::Type *Ty,
John McCallf85e1932011-06-15 23:02:42 +00001315 GlobalDecl D, bool ForVTable,
Bill Wendlingc4c62fd2013-01-31 00:30:05 +00001316 llvm::AttributeSet ExtraAttrs) {
Chris Lattner0558e792009-03-21 09:25:43 +00001317 // Lookup the entry, lazily creating it if necessary.
John McCallf746aa62010-03-19 23:29:14 +00001318 llvm::GlobalValue *Entry = GetGlobalValue(MangledName);
Chris Lattner0558e792009-03-21 09:25:43 +00001319 if (Entry) {
Benjamin Kramerd48bcb22012-08-22 15:37:55 +00001320 if (WeakRefReferences.erase(Entry)) {
Rafael Espindola6a836702010-03-04 18:17:24 +00001321 const FunctionDecl *FD = cast_or_null<FunctionDecl>(D.getDecl());
1322 if (FD && !FD->hasAttr<WeakAttr>())
Anders Carlsson7270ee42010-03-23 04:31:31 +00001323 Entry->setLinkage(llvm::Function::ExternalLinkage);
Rafael Espindola6a836702010-03-04 18:17:24 +00001324 }
1325
Chris Lattner0558e792009-03-21 09:25:43 +00001326 if (Entry->getType()->getElementType() == Ty)
1327 return Entry;
Mike Stump1eb44332009-09-09 15:08:12 +00001328
Chris Lattner0558e792009-03-21 09:25:43 +00001329 // Make sure the result is of the correct type.
Chris Lattner9cbe4f02011-07-09 17:41:47 +00001330 return llvm::ConstantExpr::getBitCast(Entry, Ty->getPointerTo());
Chris Lattner0558e792009-03-21 09:25:43 +00001331 }
Mike Stump1eb44332009-09-09 15:08:12 +00001332
Eli Friedman654ad402009-11-09 05:07:37 +00001333 // This function doesn't have a complete type (for example, the return
1334 // type is an incomplete struct). Use a fake type instead, and make
1335 // sure not to try to set attributes.
1336 bool IsIncompleteFunction = false;
John McCall784f2112010-04-28 00:00:30 +00001337
Chris Lattner2acc6e32011-07-18 04:24:23 +00001338 llvm::FunctionType *FTy;
John McCall784f2112010-04-28 00:00:30 +00001339 if (isa<llvm::FunctionType>(Ty)) {
1340 FTy = cast<llvm::FunctionType>(Ty);
1341 } else {
John McCall0774cb82011-05-15 01:53:33 +00001342 FTy = llvm::FunctionType::get(VoidTy, false);
Eli Friedman654ad402009-11-09 05:07:37 +00001343 IsIncompleteFunction = true;
1344 }
Chris Lattnerbcaedae2010-06-30 19:14:05 +00001345
John McCall784f2112010-04-28 00:00:30 +00001346 llvm::Function *F = llvm::Function::Create(FTy,
Eli Friedman654ad402009-11-09 05:07:37 +00001347 llvm::Function::ExternalLinkage,
John McCallf746aa62010-03-19 23:29:14 +00001348 MangledName, &getModule());
1349 assert(F->getName() == MangledName && "name was uniqued!");
Eli Friedman654ad402009-11-09 05:07:37 +00001350 if (D.getDecl())
Anders Carlssonb2bcf1c2010-02-06 02:44:09 +00001351 SetFunctionAttributes(D, F, IsIncompleteFunction);
Bill Wendlingc4c62fd2013-01-31 00:30:05 +00001352 if (ExtraAttrs.hasAttributes(llvm::AttributeSet::FunctionIndex)) {
1353 llvm::AttrBuilder B(ExtraAttrs, llvm::AttributeSet::FunctionIndex);
Bill Wendling909b6de2013-01-23 00:21:06 +00001354 F->addAttributes(llvm::AttributeSet::FunctionIndex,
1355 llvm::AttributeSet::get(VMContext,
1356 llvm::AttributeSet::FunctionIndex,
1357 B));
1358 }
Eli Friedman654ad402009-11-09 05:07:37 +00001359
Chris Lattner67b00522009-03-21 09:44:56 +00001360 // This is the first use or definition of a mangled name. If there is a
1361 // deferred decl with this name, remember that we need to emit it at the end
1362 // of the file.
John McCallf746aa62010-03-19 23:29:14 +00001363 llvm::StringMap<GlobalDecl>::iterator DDI = DeferredDecls.find(MangledName);
Chris Lattner67b00522009-03-21 09:44:56 +00001364 if (DDI != DeferredDecls.end()) {
1365 // Move the potentially referenced deferred decl to the DeferredDeclsToEmit
1366 // list, and remove it from DeferredDecls (since we don't need it anymore).
1367 DeferredDeclsToEmit.push_back(DDI->second);
1368 DeferredDecls.erase(DDI);
John McCallbfdcdc82010-12-15 04:00:32 +00001369
1370 // Otherwise, there are cases we have to worry about where we're
1371 // using a declaration for which we must emit a definition but where
1372 // we might not find a top-level definition:
1373 // - member functions defined inline in their classes
1374 // - friend functions defined inline in some class
1375 // - special member functions with implicit definitions
1376 // If we ever change our AST traversal to walk into class methods,
1377 // this will be unnecessary.
Anders Carlsson1faa89f2011-02-05 04:35:53 +00001378 //
1379 // We also don't emit a definition for a function if it's going to be an entry
1380 // in a vtable, unless it's already marked as used.
David Blaikie4e4d0842012-03-11 07:00:24 +00001381 } else if (getLangOpts().CPlusPlus && D.getDecl()) {
John McCallbfdcdc82010-12-15 04:00:32 +00001382 // Look for a declaration that's lexically in a record.
1383 const FunctionDecl *FD = cast<FunctionDecl>(D.getDecl());
Eli Friedmanb135f0f2012-07-02 21:05:30 +00001384 FD = FD->getMostRecentDecl();
John McCallbfdcdc82010-12-15 04:00:32 +00001385 do {
1386 if (isa<CXXRecordDecl>(FD->getLexicalDeclContext())) {
Anders Carlsson1faa89f2011-02-05 04:35:53 +00001387 if (FD->isImplicit() && !ForVTable) {
John McCallbfdcdc82010-12-15 04:00:32 +00001388 assert(FD->isUsed() && "Sema didn't mark implicit function as used!");
Douglas Gregora29bf412011-02-09 02:03:05 +00001389 DeferredDeclsToEmit.push_back(D.getWithDecl(FD));
John McCallbfdcdc82010-12-15 04:00:32 +00001390 break;
Sean Hunt10620eb2011-05-06 20:44:56 +00001391 } else if (FD->doesThisDeclarationHaveABody()) {
Douglas Gregora29bf412011-02-09 02:03:05 +00001392 DeferredDeclsToEmit.push_back(D.getWithDecl(FD));
John McCallbfdcdc82010-12-15 04:00:32 +00001393 break;
1394 }
Rafael Espindola7b9a5aa2010-03-02 21:28:26 +00001395 }
Douglas Gregoref96ee02012-01-14 16:38:05 +00001396 FD = FD->getPreviousDecl();
John McCallbfdcdc82010-12-15 04:00:32 +00001397 } while (FD);
Chris Lattner67b00522009-03-21 09:44:56 +00001398 }
Mike Stump1eb44332009-09-09 15:08:12 +00001399
John McCall784f2112010-04-28 00:00:30 +00001400 // Make sure the result is of the requested type.
1401 if (!IsIncompleteFunction) {
1402 assert(F->getType()->getElementType() == Ty);
1403 return F;
1404 }
1405
Chris Lattner9cbe4f02011-07-09 17:41:47 +00001406 llvm::Type *PTy = llvm::PointerType::getUnqual(Ty);
John McCall784f2112010-04-28 00:00:30 +00001407 return llvm::ConstantExpr::getBitCast(F, PTy);
Chris Lattner0558e792009-03-21 09:25:43 +00001408}
1409
Chris Lattner74391b42009-03-22 21:03:39 +00001410/// GetAddrOfFunction - Return the address of the given function. If Ty is
1411/// non-null, then this function will use the specified type if it has to
1412/// create it (this occurs when we see a definition of the function).
Chris Lattnerb4880ba2009-05-12 21:21:08 +00001413llvm::Constant *CodeGenModule::GetAddrOfFunction(GlobalDecl GD,
Chris Lattner2acc6e32011-07-18 04:24:23 +00001414 llvm::Type *Ty,
Anders Carlsson1faa89f2011-02-05 04:35:53 +00001415 bool ForVTable) {
Chris Lattner74391b42009-03-22 21:03:39 +00001416 // If there was no specific requested type, just convert it now.
1417 if (!Ty)
Anders Carlsson4a6835e2009-09-10 23:38:47 +00001418 Ty = getTypes().ConvertType(cast<ValueDecl>(GD.getDecl())->getType());
Chris Lattnerbcaedae2010-06-30 19:14:05 +00001419
Chris Lattner5f9e2722011-07-23 10:55:15 +00001420 StringRef MangledName = getMangledName(GD);
Anders Carlsson1faa89f2011-02-05 04:35:53 +00001421 return GetOrCreateLLVMFunction(MangledName, Ty, GD, ForVTable);
Chris Lattner74391b42009-03-22 21:03:39 +00001422}
Eli Friedman77ba7082008-05-30 19:50:47 +00001423
Chris Lattner74391b42009-03-22 21:03:39 +00001424/// CreateRuntimeFunction - Create a new runtime function with the specified
1425/// type and name.
1426llvm::Constant *
Chris Lattner2acc6e32011-07-18 04:24:23 +00001427CodeGenModule::CreateRuntimeFunction(llvm::FunctionType *FTy,
Chris Lattner5f9e2722011-07-23 10:55:15 +00001428 StringRef Name,
Bill Wendlingc4c62fd2013-01-31 00:30:05 +00001429 llvm::AttributeSet ExtraAttrs) {
John McCallbd7370a2013-02-28 19:01:20 +00001430 llvm::Constant *C
1431 = GetOrCreateLLVMFunction(Name, FTy, GlobalDecl(), /*ForVTable=*/false,
1432 ExtraAttrs);
1433 if (llvm::Function *F = dyn_cast<llvm::Function>(C))
1434 if (F->empty())
1435 F->setCallingConv(getRuntimeCC());
1436 return C;
Chris Lattner74391b42009-03-22 21:03:39 +00001437}
Daniel Dunbarbd012ff2008-07-29 23:18:29 +00001438
Richard Smitha9b21d22012-02-17 06:48:11 +00001439/// isTypeConstant - Determine whether an object of this type can be emitted
1440/// as a constant.
1441///
1442/// If ExcludeCtor is true, the duration when the object's constructor runs
1443/// will not be considered. The caller will need to verify that the object is
1444/// not written to during its construction.
1445bool CodeGenModule::isTypeConstant(QualType Ty, bool ExcludeCtor) {
1446 if (!Ty.isConstant(Context) && !Ty->isReferenceType())
Eli Friedman20e098b2009-12-11 21:23:03 +00001447 return false;
Richard Smitha9b21d22012-02-17 06:48:11 +00001448
David Blaikie4e4d0842012-03-11 07:00:24 +00001449 if (Context.getLangOpts().CPlusPlus) {
Richard Smitha9b21d22012-02-17 06:48:11 +00001450 if (const CXXRecordDecl *Record
1451 = Context.getBaseElementType(Ty)->getAsCXXRecordDecl())
1452 return ExcludeCtor && !Record->hasMutableFields() &&
1453 Record->hasTrivialDestructor();
Eli Friedman20e098b2009-12-11 21:23:03 +00001454 }
Richard Smitha9b21d22012-02-17 06:48:11 +00001455
Eli Friedman20e098b2009-12-11 21:23:03 +00001456 return true;
1457}
1458
Chris Lattner74391b42009-03-22 21:03:39 +00001459/// GetOrCreateLLVMGlobal - If the specified mangled name is not in the module,
1460/// create and return an llvm GlobalVariable with the specified type. If there
1461/// is something in the module with the specified name, return it potentially
1462/// bitcasted to the right type.
1463///
1464/// If D is non-null, it specifies a decl that correspond to this. This is used
1465/// to set the attributes on the global when it is first created.
John McCallf746aa62010-03-19 23:29:14 +00001466llvm::Constant *
Chris Lattner5f9e2722011-07-23 10:55:15 +00001467CodeGenModule::GetOrCreateLLVMGlobal(StringRef MangledName,
Chris Lattner2acc6e32011-07-18 04:24:23 +00001468 llvm::PointerType *Ty,
Rafael Espindolac532b502011-01-18 21:07:57 +00001469 const VarDecl *D,
1470 bool UnnamedAddr) {
Daniel Dunbar3c827a72008-08-05 23:31:02 +00001471 // Lookup the entry, lazily creating it if necessary.
John McCallf746aa62010-03-19 23:29:14 +00001472 llvm::GlobalValue *Entry = GetGlobalValue(MangledName);
Chris Lattner99b53612009-03-21 08:03:33 +00001473 if (Entry) {
Benjamin Kramerd48bcb22012-08-22 15:37:55 +00001474 if (WeakRefReferences.erase(Entry)) {
Rafael Espindola6a836702010-03-04 18:17:24 +00001475 if (D && !D->hasAttr<WeakAttr>())
Anders Carlsson7270ee42010-03-23 04:31:31 +00001476 Entry->setLinkage(llvm::Function::ExternalLinkage);
Rafael Espindola6a836702010-03-04 18:17:24 +00001477 }
1478
Rafael Espindolac532b502011-01-18 21:07:57 +00001479 if (UnnamedAddr)
1480 Entry->setUnnamedAddr(true);
1481
Chris Lattner74391b42009-03-22 21:03:39 +00001482 if (Entry->getType() == Ty)
Chris Lattner570585c2009-03-21 09:16:30 +00001483 return Entry;
Mike Stump1eb44332009-09-09 15:08:12 +00001484
Chris Lattner99b53612009-03-21 08:03:33 +00001485 // Make sure the result is of the correct type.
Owen Anderson3c4972d2009-07-29 18:54:39 +00001486 return llvm::ConstantExpr::getBitCast(Entry, Ty);
Daniel Dunbar49988882009-01-13 02:25:00 +00001487 }
Mike Stump1eb44332009-09-09 15:08:12 +00001488
Chris Lattner67b00522009-03-21 09:44:56 +00001489 // This is the first use or definition of a mangled name. If there is a
1490 // deferred decl with this name, remember that we need to emit it at the end
1491 // of the file.
John McCallf746aa62010-03-19 23:29:14 +00001492 llvm::StringMap<GlobalDecl>::iterator DDI = DeferredDecls.find(MangledName);
Chris Lattner67b00522009-03-21 09:44:56 +00001493 if (DDI != DeferredDecls.end()) {
1494 // Move the potentially referenced deferred decl to the DeferredDeclsToEmit
1495 // list, and remove it from DeferredDecls (since we don't need it anymore).
1496 DeferredDeclsToEmit.push_back(DDI->second);
1497 DeferredDecls.erase(DDI);
1498 }
Mike Stump1eb44332009-09-09 15:08:12 +00001499
Peter Collingbourne4dc34eb2012-05-20 21:08:35 +00001500 unsigned AddrSpace = GetGlobalVarAddressSpace(D, Ty->getAddressSpace());
Mike Stump1eb44332009-09-09 15:08:12 +00001501 llvm::GlobalVariable *GV =
1502 new llvm::GlobalVariable(getModule(), Ty->getElementType(), false,
Chris Lattner99b53612009-03-21 08:03:33 +00001503 llvm::GlobalValue::ExternalLinkage,
John McCallf746aa62010-03-19 23:29:14 +00001504 0, MangledName, 0,
Hans Wennborg5e2d5de2012-06-23 11:51:46 +00001505 llvm::GlobalVariable::NotThreadLocal, AddrSpace);
Chris Lattner99b53612009-03-21 08:03:33 +00001506
1507 // Handle things which are present even on external declarations.
Chris Lattner74391b42009-03-22 21:03:39 +00001508 if (D) {
Mike Stumpf5408fe2009-05-16 07:57:57 +00001509 // FIXME: This code is overly simple and should be merged with other global
1510 // handling.
Richard Smitha9b21d22012-02-17 06:48:11 +00001511 GV->setConstant(isTypeConstant(D->getType(), false));
Chris Lattner99b53612009-03-21 08:03:33 +00001512
John McCall110e8e52010-10-29 22:22:43 +00001513 // Set linkage and visibility in case we never see a definition.
Rafael Espindola2beda122013-02-27 02:15:29 +00001514 LinkageInfo LV = D->getLinkageAndVisibility();
Rafael Espindolaf127eb82013-02-27 02:56:45 +00001515 if (LV.getLinkage() != ExternalLinkage) {
John McCall15e310a2011-02-19 02:53:41 +00001516 // Don't set internal linkage on declarations.
John McCall110e8e52010-10-29 22:22:43 +00001517 } else {
1518 if (D->hasAttr<DLLImportAttr>())
1519 GV->setLinkage(llvm::GlobalValue::DLLImportLinkage);
Douglas Gregor0a0d2b12011-03-23 00:50:03 +00001520 else if (D->hasAttr<WeakAttr>() || D->isWeakImported())
John McCall110e8e52010-10-29 22:22:43 +00001521 GV->setLinkage(llvm::GlobalValue::ExternalWeakLinkage);
Chris Lattner99b53612009-03-21 08:03:33 +00001522
John McCallaf146032010-10-30 11:50:40 +00001523 // Set visibility on a declaration only if it's explicit.
Rafael Espindolaf127eb82013-02-27 02:56:45 +00001524 if (LV.isVisibilityExplicit())
1525 GV->setVisibility(GetLLVMVisibility(LV.getVisibility()));
John McCall110e8e52010-10-29 22:22:43 +00001526 }
Eli Friedman56ebe502009-04-19 21:05:03 +00001527
Richard Smithb80a16e2013-04-19 16:42:07 +00001528 if (D->getTLSKind()) {
Richard Smithdb4f61f2013-04-22 08:06:17 +00001529 if (D->getTLSKind() == VarDecl::TLS_Dynamic)
1530 CXXThreadLocals.push_back(std::make_pair(D, GV));
Hans Wennborgde981f32012-06-28 08:01:44 +00001531 setTLSMode(GV, *D);
Richard Smithb80a16e2013-04-19 16:42:07 +00001532 }
Chris Lattner74391b42009-03-22 21:03:39 +00001533 }
Mike Stump1eb44332009-09-09 15:08:12 +00001534
Peter Collingbourne4dc34eb2012-05-20 21:08:35 +00001535 if (AddrSpace != Ty->getAddressSpace())
1536 return llvm::ConstantExpr::getBitCast(GV, Ty);
1537 else
1538 return GV;
Daniel Dunbarbd012ff2008-07-29 23:18:29 +00001539}
1540
Chris Lattner74391b42009-03-22 21:03:39 +00001541
Anders Carlsson3bd62022011-01-29 18:20:20 +00001542llvm::GlobalVariable *
Chris Lattner5f9e2722011-07-23 10:55:15 +00001543CodeGenModule::CreateOrReplaceCXXRuntimeVariable(StringRef Name,
Chris Lattner2acc6e32011-07-18 04:24:23 +00001544 llvm::Type *Ty,
Anders Carlsson3bd62022011-01-29 18:20:20 +00001545 llvm::GlobalValue::LinkageTypes Linkage) {
1546 llvm::GlobalVariable *GV = getModule().getNamedGlobal(Name);
1547 llvm::GlobalVariable *OldGV = 0;
1548
1549
1550 if (GV) {
1551 // Check if the variable has the right type.
1552 if (GV->getType()->getElementType() == Ty)
1553 return GV;
1554
1555 // Because C++ name mangling, the only way we can end up with an already
1556 // existing global with the same name is if it has been declared extern "C".
Nico Weberc5f80462012-10-11 10:13:44 +00001557 assert(GV->isDeclaration() && "Declaration has wrong type!");
Anders Carlsson3bd62022011-01-29 18:20:20 +00001558 OldGV = GV;
1559 }
1560
1561 // Create a new variable.
1562 GV = new llvm::GlobalVariable(getModule(), Ty, /*isConstant=*/true,
1563 Linkage, 0, Name);
1564
1565 if (OldGV) {
1566 // Replace occurrences of the old variable if needed.
1567 GV->takeName(OldGV);
1568
1569 if (!OldGV->use_empty()) {
1570 llvm::Constant *NewPtrForOldDecl =
1571 llvm::ConstantExpr::getBitCast(GV, OldGV->getType());
1572 OldGV->replaceAllUsesWith(NewPtrForOldDecl);
1573 }
1574
1575 OldGV->eraseFromParent();
1576 }
1577
1578 return GV;
1579}
1580
Chris Lattner74391b42009-03-22 21:03:39 +00001581/// GetAddrOfGlobalVar - Return the llvm::Constant for the address of the
1582/// given global variable. If Ty is non-null and if the global doesn't exist,
Eric Christopher0ff258b2012-04-16 23:55:04 +00001583/// then it will be created with the specified type instead of whatever the
Chris Lattner74391b42009-03-22 21:03:39 +00001584/// normal requested type would be.
1585llvm::Constant *CodeGenModule::GetAddrOfGlobalVar(const VarDecl *D,
Chris Lattner2acc6e32011-07-18 04:24:23 +00001586 llvm::Type *Ty) {
Chris Lattner74391b42009-03-22 21:03:39 +00001587 assert(D->hasGlobalStorage() && "Not a global variable");
1588 QualType ASTTy = D->getType();
1589 if (Ty == 0)
1590 Ty = getTypes().ConvertTypeForMem(ASTTy);
Mike Stump1eb44332009-09-09 15:08:12 +00001591
Chris Lattner2acc6e32011-07-18 04:24:23 +00001592 llvm::PointerType *PTy =
Peter Collingbourne207f4d82011-03-18 22:38:29 +00001593 llvm::PointerType::get(Ty, getContext().getTargetAddressSpace(ASTTy));
John McCallf746aa62010-03-19 23:29:14 +00001594
Chris Lattner5f9e2722011-07-23 10:55:15 +00001595 StringRef MangledName = getMangledName(D);
John McCallf746aa62010-03-19 23:29:14 +00001596 return GetOrCreateLLVMGlobal(MangledName, PTy, D);
Chris Lattner74391b42009-03-22 21:03:39 +00001597}
1598
1599/// CreateRuntimeVariable - Create a new runtime global variable with the
1600/// specified type and name.
1601llvm::Constant *
Chris Lattner2acc6e32011-07-18 04:24:23 +00001602CodeGenModule::CreateRuntimeVariable(llvm::Type *Ty,
Chris Lattner5f9e2722011-07-23 10:55:15 +00001603 StringRef Name) {
John McCall1de4d4e2011-04-07 08:22:57 +00001604 return GetOrCreateLLVMGlobal(Name, llvm::PointerType::getUnqual(Ty), 0,
Rafael Espindolac532b502011-01-18 21:07:57 +00001605 true);
Chris Lattner74391b42009-03-22 21:03:39 +00001606}
1607
Daniel Dunbar03f5ad92009-04-15 22:08:45 +00001608void CodeGenModule::EmitTentativeDefinition(const VarDecl *D) {
1609 assert(!D->getInit() && "Cannot emit definite definitions here!");
1610
Douglas Gregor7520bd12009-04-21 19:28:58 +00001611 if (MayDeferGeneration(D)) {
1612 // If we have not seen a reference to this variable yet, place it
1613 // into the deferred declarations table to be emitted if needed
1614 // later.
Chris Lattner5f9e2722011-07-23 10:55:15 +00001615 StringRef MangledName = getMangledName(D);
John McCallf746aa62010-03-19 23:29:14 +00001616 if (!GetGlobalValue(MangledName)) {
Anders Carlsson555b4bb2009-09-10 23:43:36 +00001617 DeferredDecls[MangledName] = D;
Daniel Dunbar03f5ad92009-04-15 22:08:45 +00001618 return;
Douglas Gregor7520bd12009-04-21 19:28:58 +00001619 }
1620 }
1621
1622 // The tentative definition is the only definition.
Daniel Dunbar03f5ad92009-04-15 22:08:45 +00001623 EmitGlobalVarDefinition(D);
1624}
1625
Chris Lattner2acc6e32011-07-18 04:24:23 +00001626CharUnits CodeGenModule::GetTargetTypeStoreSize(llvm::Type *Ty) const {
Ken Dyck06f486e2011-01-18 02:01:14 +00001627 return Context.toCharUnitsFromBits(
Micah Villmow25a6a842012-10-08 16:25:52 +00001628 TheDataLayout.getTypeStoreSizeInBits(Ty));
Ken Dyck687cc4a2010-01-26 13:48:07 +00001629}
1630
Sebastian Redl19b1a6e2012-02-25 20:51:20 +00001631llvm::Constant *
1632CodeGenModule::MaybeEmitGlobalStdInitializerListInitializer(const VarDecl *D,
1633 const Expr *rawInit) {
1634 ArrayRef<ExprWithCleanups::CleanupObject> cleanups;
1635 if (const ExprWithCleanups *withCleanups =
1636 dyn_cast<ExprWithCleanups>(rawInit)) {
1637 cleanups = withCleanups->getObjects();
1638 rawInit = withCleanups->getSubExpr();
1639 }
1640
1641 const InitListExpr *init = dyn_cast<InitListExpr>(rawInit);
1642 if (!init || !init->initializesStdInitializerList() ||
1643 init->getNumInits() == 0)
1644 return 0;
1645
1646 ASTContext &ctx = getContext();
Sebastian Redl19b1a6e2012-02-25 20:51:20 +00001647 unsigned numInits = init->getNumInits();
Sebastian Redl062a82c2012-02-27 23:20:01 +00001648 // FIXME: This check is here because we would otherwise silently miscompile
1649 // nested global std::initializer_lists. Better would be to have a real
1650 // implementation.
1651 for (unsigned i = 0; i < numInits; ++i) {
1652 const InitListExpr *inner = dyn_cast<InitListExpr>(init->getInit(i));
1653 if (inner && inner->initializesStdInitializerList()) {
1654 ErrorUnsupported(inner, "nested global std::initializer_list");
1655 return 0;
1656 }
1657 }
1658
1659 // Synthesize a fake VarDecl for the array and initialize that.
Sebastian Redl19b1a6e2012-02-25 20:51:20 +00001660 QualType elementType = init->getInit(0)->getType();
1661 llvm::APInt numElements(ctx.getTypeSize(ctx.getSizeType()), numInits);
1662 QualType arrayType = ctx.getConstantArrayType(elementType, numElements,
1663 ArrayType::Normal, 0);
1664
1665 IdentifierInfo *name = &ctx.Idents.get(D->getNameAsString() + "__initlist");
1666 TypeSourceInfo *sourceInfo = ctx.getTrivialTypeSourceInfo(
1667 arrayType, D->getLocation());
1668 VarDecl *backingArray = VarDecl::Create(ctx, const_cast<DeclContext*>(
1669 D->getDeclContext()),
1670 D->getLocStart(), D->getLocation(),
1671 name, arrayType, sourceInfo,
Rafael Espindolad2615cc2013-04-03 19:27:57 +00001672 SC_Static);
Enea Zaffanelladc173842013-05-04 08:27:07 +00001673 backingArray->setTSCSpec(D->getTSCSpec());
Sebastian Redl19b1a6e2012-02-25 20:51:20 +00001674
1675 // Now clone the InitListExpr to initialize the array instead.
1676 // Incredible hack: we want to use the existing InitListExpr here, so we need
1677 // to tell it that it no longer initializes a std::initializer_list.
Benjamin Kramer3b6bef92012-08-24 11:54:20 +00001678 ArrayRef<Expr*> Inits(const_cast<InitListExpr*>(init)->getInits(),
1679 init->getNumInits());
1680 Expr *arrayInit = new (ctx) InitListExpr(ctx, init->getLBraceLoc(), Inits,
1681 init->getRBraceLoc());
Sebastian Redl19b1a6e2012-02-25 20:51:20 +00001682 arrayInit->setType(arrayType);
1683
1684 if (!cleanups.empty())
1685 arrayInit = ExprWithCleanups::Create(ctx, arrayInit, cleanups);
1686
1687 backingArray->setInit(arrayInit);
1688
1689 // Emit the definition of the array.
1690 EmitGlobalVarDefinition(backingArray);
1691
1692 // Inspect the initializer list to validate it and determine its type.
1693 // FIXME: doing this every time is probably inefficient; caching would be nice
1694 RecordDecl *record = init->getType()->castAs<RecordType>()->getDecl();
1695 RecordDecl::field_iterator field = record->field_begin();
1696 if (field == record->field_end()) {
1697 ErrorUnsupported(D, "weird std::initializer_list");
1698 return 0;
1699 }
1700 QualType elementPtr = ctx.getPointerType(elementType.withConst());
1701 // Start pointer.
1702 if (!ctx.hasSameType(field->getType(), elementPtr)) {
1703 ErrorUnsupported(D, "weird std::initializer_list");
1704 return 0;
1705 }
1706 ++field;
1707 if (field == record->field_end()) {
1708 ErrorUnsupported(D, "weird std::initializer_list");
1709 return 0;
1710 }
1711 bool isStartEnd = false;
1712 if (ctx.hasSameType(field->getType(), elementPtr)) {
1713 // End pointer.
1714 isStartEnd = true;
1715 } else if(!ctx.hasSameType(field->getType(), ctx.getSizeType())) {
1716 ErrorUnsupported(D, "weird std::initializer_list");
1717 return 0;
1718 }
1719
1720 // Now build an APValue representing the std::initializer_list.
1721 APValue initListValue(APValue::UninitStruct(), 0, 2);
1722 APValue &startField = initListValue.getStructField(0);
1723 APValue::LValuePathEntry startOffsetPathEntry;
1724 startOffsetPathEntry.ArrayIndex = 0;
1725 startField = APValue(APValue::LValueBase(backingArray),
1726 CharUnits::fromQuantity(0),
1727 llvm::makeArrayRef(startOffsetPathEntry),
1728 /*IsOnePastTheEnd=*/false, 0);
1729
1730 if (isStartEnd) {
1731 APValue &endField = initListValue.getStructField(1);
1732 APValue::LValuePathEntry endOffsetPathEntry;
1733 endOffsetPathEntry.ArrayIndex = numInits;
1734 endField = APValue(APValue::LValueBase(backingArray),
1735 ctx.getTypeSizeInChars(elementType) * numInits,
1736 llvm::makeArrayRef(endOffsetPathEntry),
1737 /*IsOnePastTheEnd=*/true, 0);
1738 } else {
1739 APValue &sizeField = initListValue.getStructField(1);
1740 sizeField = APValue(llvm::APSInt(numElements));
1741 }
1742
1743 // Emit the constant for the initializer_list.
Richard Smitha3ca41f2012-03-02 23:27:11 +00001744 llvm::Constant *llvmInit =
1745 EmitConstantValueForMemory(initListValue, D->getType());
Sebastian Redl19b1a6e2012-02-25 20:51:20 +00001746 assert(llvmInit && "failed to initialize as constant");
1747 return llvmInit;
1748}
1749
Peter Collingbourne4dc34eb2012-05-20 21:08:35 +00001750unsigned CodeGenModule::GetGlobalVarAddressSpace(const VarDecl *D,
1751 unsigned AddrSpace) {
1752 if (LangOpts.CUDA && CodeGenOpts.CUDAIsDevice) {
1753 if (D->hasAttr<CUDAConstantAttr>())
1754 AddrSpace = getContext().getTargetAddressSpace(LangAS::cuda_constant);
1755 else if (D->hasAttr<CUDASharedAttr>())
1756 AddrSpace = getContext().getTargetAddressSpace(LangAS::cuda_shared);
1757 else
1758 AddrSpace = getContext().getTargetAddressSpace(LangAS::cuda_device);
1759 }
1760
1761 return AddrSpace;
1762}
1763
Richard Smith00249372013-04-06 05:00:46 +00001764template<typename SomeDecl>
1765void CodeGenModule::MaybeHandleStaticInExternC(const SomeDecl *D,
1766 llvm::GlobalValue *GV) {
1767 if (!getLangOpts().CPlusPlus)
1768 return;
1769
1770 // Must have 'used' attribute, or else inline assembly can't rely on
1771 // the name existing.
1772 if (!D->template hasAttr<UsedAttr>())
1773 return;
1774
1775 // Must have internal linkage and an ordinary name.
Rafael Espindola181e3ec2013-05-13 00:12:11 +00001776 if (!D->getIdentifier() || D->getFormalLinkage() != InternalLinkage)
Richard Smith00249372013-04-06 05:00:46 +00001777 return;
1778
1779 // Must be in an extern "C" context. Entities declared directly within
1780 // a record are not extern "C" even if the record is in such a context.
Rafael Espindolad8ffd0b2013-05-05 20:15:21 +00001781 const SomeDecl *First = D->getFirstDeclaration();
1782 if (First->getDeclContext()->isRecord() || !First->isInExternCContext())
Richard Smith00249372013-04-06 05:00:46 +00001783 return;
1784
1785 // OK, this is an internal linkage entity inside an extern "C" linkage
1786 // specification. Make a note of that so we can give it the "expected"
1787 // mangled name if nothing else is using that name.
Richard Smith67972042013-04-06 07:07:44 +00001788 std::pair<StaticExternCMap::iterator, bool> R =
1789 StaticExternCValues.insert(std::make_pair(D->getIdentifier(), GV));
Richard Smith00249372013-04-06 05:00:46 +00001790
1791 // If we have multiple internal linkage entities with the same name
1792 // in extern "C" regions, none of them gets that name.
Richard Smith67972042013-04-06 07:07:44 +00001793 if (!R.second)
1794 R.first->second = 0;
Richard Smith00249372013-04-06 05:00:46 +00001795}
1796
Daniel Dunbarbd012ff2008-07-29 23:18:29 +00001797void CodeGenModule::EmitGlobalVarDefinition(const VarDecl *D) {
Chris Lattner8f32f712007-07-14 00:23:28 +00001798 llvm::Constant *Init = 0;
Eli Friedman77ba7082008-05-30 19:50:47 +00001799 QualType ASTTy = D->getType();
Richard Smith7ca48502012-02-13 22:16:19 +00001800 CXXRecordDecl *RD = ASTTy->getBaseElementTypeUnsafe()->getAsCXXRecordDecl();
1801 bool NeedsGlobalCtor = false;
1802 bool NeedsGlobalDtor = RD && !RD->hasTrivialDestructor();
Mike Stump1eb44332009-09-09 15:08:12 +00001803
Richard Smith2d6a5672012-01-14 04:30:29 +00001804 const VarDecl *InitDecl;
1805 const Expr *InitExpr = D->getAnyInitializer(InitDecl);
Sebastian Redl19b1a6e2012-02-25 20:51:20 +00001806
Anders Carlsson3bb92692010-01-26 17:43:42 +00001807 if (!InitExpr) {
Eli Friedmancd5f4aa2008-05-30 20:39:54 +00001808 // This is a tentative definition; tentative definitions are
Daniel Dunbar03f5ad92009-04-15 22:08:45 +00001809 // implicitly initialized with { 0 }.
1810 //
1811 // Note that tentative definitions are only emitted at the end of
1812 // a translation unit, so they should never have incomplete
1813 // type. In addition, EmitTentativeDefinition makes sure that we
1814 // never attempt to emit a tentative definition if a real one
1815 // exists. A use may still exists, however, so we still may need
1816 // to do a RAUW.
1817 assert(!ASTTy->isIncompleteType() && "Unexpected incomplete type");
Anders Carlssonb0d0ea02009-08-02 21:18:22 +00001818 Init = EmitNullConstant(D->getType());
Eli Friedman77ba7082008-05-30 19:50:47 +00001819 } else {
Sebastian Redl19b1a6e2012-02-25 20:51:20 +00001820 // If this is a std::initializer_list, emit the special initializer.
1821 Init = MaybeEmitGlobalStdInitializerListInitializer(D, InitExpr);
1822 // An empty init list will perform zero-initialization, which happens
1823 // to be exactly what we want.
1824 // FIXME: It does so in a global constructor, which is *not* what we
1825 // want.
1826
Fariborz Jahanian4904bf42012-06-26 16:06:38 +00001827 if (!Init) {
1828 initializedGlobalDecl = GlobalDecl(D);
Sebastian Redl19b1a6e2012-02-25 20:51:20 +00001829 Init = EmitConstantInit(*InitDecl);
Fariborz Jahanian4904bf42012-06-26 16:06:38 +00001830 }
Eli Friedman6e656f42009-02-20 01:18:21 +00001831 if (!Init) {
Anders Carlsson3bb92692010-01-26 17:43:42 +00001832 QualType T = InitExpr->getType();
Douglas Gregorc446d182010-05-05 20:15:55 +00001833 if (D->getType()->isReferenceType())
1834 T = D->getType();
Richard Smith2d6a5672012-01-14 04:30:29 +00001835
David Blaikie4e4d0842012-03-11 07:00:24 +00001836 if (getLangOpts().CPlusPlus) {
Anders Carlsson89ed31d2009-08-08 23:24:23 +00001837 Init = EmitNullConstant(T);
Richard Smith7ca48502012-02-13 22:16:19 +00001838 NeedsGlobalCtor = true;
Anders Carlsson89ed31d2009-08-08 23:24:23 +00001839 } else {
1840 ErrorUnsupported(D, "static initializer");
1841 Init = llvm::UndefValue::get(getTypes().ConvertType(T));
1842 }
John McCallbf40cb52010-07-15 23:40:35 +00001843 } else {
1844 // We don't need an initializer, so remove the entry for the delayed
Richard Smith7ca48502012-02-13 22:16:19 +00001845 // initializer position (just in case this entry was delayed) if we
1846 // also don't need to register a destructor.
David Blaikie4e4d0842012-03-11 07:00:24 +00001847 if (getLangOpts().CPlusPlus && !NeedsGlobalDtor)
John McCallbf40cb52010-07-15 23:40:35 +00001848 DelayedCXXInitPosition.erase(D);
Eli Friedman6e656f42009-02-20 01:18:21 +00001849 }
Eli Friedman77ba7082008-05-30 19:50:47 +00001850 }
Eli Friedman77ba7082008-05-30 19:50:47 +00001851
Chris Lattner2acc6e32011-07-18 04:24:23 +00001852 llvm::Type* InitType = Init->getType();
Chris Lattner570585c2009-03-21 09:16:30 +00001853 llvm::Constant *Entry = GetAddrOfGlobalVar(D, InitType);
Mike Stump1eb44332009-09-09 15:08:12 +00001854
Chris Lattner570585c2009-03-21 09:16:30 +00001855 // Strip off a bitcast if we got one back.
1856 if (llvm::ConstantExpr *CE = dyn_cast<llvm::ConstantExpr>(Entry)) {
Chris Lattner9d4a15f2009-07-16 16:48:25 +00001857 assert(CE->getOpcode() == llvm::Instruction::BitCast ||
1858 // all zero index gep.
1859 CE->getOpcode() == llvm::Instruction::GetElementPtr);
Chris Lattner570585c2009-03-21 09:16:30 +00001860 Entry = CE->getOperand(0);
1861 }
Mike Stump1eb44332009-09-09 15:08:12 +00001862
Chris Lattner570585c2009-03-21 09:16:30 +00001863 // Entry is now either a Function or GlobalVariable.
1864 llvm::GlobalVariable *GV = dyn_cast<llvm::GlobalVariable>(Entry);
Mike Stump1eb44332009-09-09 15:08:12 +00001865
Chris Lattner570585c2009-03-21 09:16:30 +00001866 // We have a definition after a declaration with the wrong type.
1867 // We must make a new GlobalVariable* and update everything that used OldGV
1868 // (a declaration or tentative definition) with the new GlobalVariable*
1869 // (which will be a definition).
1870 //
1871 // This happens if there is a prototype for a global (e.g.
1872 // "extern int x[];") and then a definition of a different type (e.g.
1873 // "int x[10];"). This also happens when an initializer has a different type
1874 // from the type of the global (this happens with unions).
Chris Lattner570585c2009-03-21 09:16:30 +00001875 if (GV == 0 ||
1876 GV->getType()->getElementType() != InitType ||
Peter Collingbourne207f4d82011-03-18 22:38:29 +00001877 GV->getType()->getAddressSpace() !=
Peter Collingbourne4dc34eb2012-05-20 21:08:35 +00001878 GetGlobalVarAddressSpace(D, getContext().getTargetAddressSpace(ASTTy))) {
Mike Stump1eb44332009-09-09 15:08:12 +00001879
John McCallf746aa62010-03-19 23:29:14 +00001880 // Move the old entry aside so that we'll create a new one.
Chris Lattner5f9e2722011-07-23 10:55:15 +00001881 Entry->setName(StringRef());
Daniel Dunbar232350d2009-02-19 05:36:41 +00001882
Chris Lattner570585c2009-03-21 09:16:30 +00001883 // Make a new global with the correct type, this is now guaranteed to work.
1884 GV = cast<llvm::GlobalVariable>(GetAddrOfGlobalVar(D, InitType));
Chris Lattner0558e792009-03-21 09:25:43 +00001885
Eli Friedman77ba7082008-05-30 19:50:47 +00001886 // Replace all uses of the old global with the new global
Mike Stump1eb44332009-09-09 15:08:12 +00001887 llvm::Constant *NewPtrForOldDecl =
Owen Anderson3c4972d2009-07-29 18:54:39 +00001888 llvm::ConstantExpr::getBitCast(GV, Entry->getType());
Chris Lattner570585c2009-03-21 09:16:30 +00001889 Entry->replaceAllUsesWith(NewPtrForOldDecl);
Eli Friedman77ba7082008-05-30 19:50:47 +00001890
1891 // Erase the old global, since it is no longer used.
Chris Lattner570585c2009-03-21 09:16:30 +00001892 cast<llvm::GlobalValue>(Entry)->eraseFromParent();
Chris Lattner8f32f712007-07-14 00:23:28 +00001893 }
Devang Patel8e53e722007-10-26 16:31:40 +00001894
Richard Smith00249372013-04-06 05:00:46 +00001895 MaybeHandleStaticInExternC(D, GV);
1896
Julien Lerouge77f68bb2011-09-09 22:41:49 +00001897 if (D->hasAttr<AnnotateAttr>())
1898 AddGlobalAnnotations(D, GV);
Nate Begeman8bd4afe2008-04-19 04:17:09 +00001899
Chris Lattner88a69ad2007-07-13 05:13:43 +00001900 GV->setInitializer(Init);
Chris Lattnere78b86f2009-08-05 05:20:29 +00001901
1902 // If it is safe to mark the global 'constant', do so now.
Richard Smitha9b21d22012-02-17 06:48:11 +00001903 GV->setConstant(!NeedsGlobalCtor && !NeedsGlobalDtor &&
1904 isTypeConstant(D->getType(), true));
Mike Stump1eb44332009-09-09 15:08:12 +00001905
Ken Dyck8b752f12010-01-27 17:10:57 +00001906 GV->setAlignment(getContext().getDeclAlign(D).getQuantity());
Richard Smitha9b21d22012-02-17 06:48:11 +00001907
Chris Lattner88a69ad2007-07-13 05:13:43 +00001908 // Set the llvm linkage type as appropriate.
Fariborz Jahanian354e7122010-10-27 16:21:54 +00001909 llvm::GlobalValue::LinkageTypes Linkage =
1910 GetLLVMLinkageVarDefinition(D, GV);
1911 GV->setLinkage(Linkage);
1912 if (Linkage == llvm::GlobalVariable::CommonLinkage)
Chris Lattnere78b86f2009-08-05 05:20:29 +00001913 // common vars aren't constant even if declared const.
1914 GV->setConstant(false);
Daniel Dunbar7e714cd2009-04-10 20:26:50 +00001915
Daniel Dunbar7c65e992009-04-14 08:05:55 +00001916 SetCommonAttributes(D, GV);
Daniel Dunbar04d40782009-04-14 06:00:08 +00001917
John McCall3030eb82010-11-06 09:44:32 +00001918 // Emit the initializer function if necessary.
Richard Smith7ca48502012-02-13 22:16:19 +00001919 if (NeedsGlobalCtor || NeedsGlobalDtor)
1920 EmitCXXGlobalVarDeclInitFunc(D, GV, NeedsGlobalCtor);
John McCall3030eb82010-11-06 09:44:32 +00001921
Kostya Serebryany05c5ebc2012-08-21 06:53:28 +00001922 // If we are compiling with ASan, add metadata indicating dynamically
1923 // initialized globals.
Will Dietz4f45bc02013-01-18 11:30:38 +00001924 if (SanOpts.Address && NeedsGlobalCtor) {
Kostya Serebryany05c5ebc2012-08-21 06:53:28 +00001925 llvm::Module &M = getModule();
1926
1927 llvm::NamedMDNode *DynamicInitializers =
1928 M.getOrInsertNamedMetadata("llvm.asan.dynamically_initialized_globals");
1929 llvm::Value *GlobalToAdd[] = { GV };
1930 llvm::MDNode *ThisGlobal = llvm::MDNode::get(VMContext, GlobalToAdd);
1931 DynamicInitializers->addOperand(ThisGlobal);
1932 }
1933
Sanjiv Gupta686226b2008-06-05 08:59:10 +00001934 // Emit global variable debug information.
Eric Christopher73fb3502011-10-13 21:45:18 +00001935 if (CGDebugInfo *DI = getModuleDebugInfo())
Douglas Gregor4cdad312012-10-23 20:05:01 +00001936 if (getCodeGenOpts().getDebugInfo() >= CodeGenOptions::LimitedDebugInfo)
Alexey Samsonovfd00eec2012-05-04 07:39:27 +00001937 DI->EmitGlobalVariable(GV, D);
Chris Lattner88a69ad2007-07-13 05:13:43 +00001938}
Reid Spencer5f016e22007-07-11 17:01:13 +00001939
Fariborz Jahanian354e7122010-10-27 16:21:54 +00001940llvm::GlobalValue::LinkageTypes
1941CodeGenModule::GetLLVMLinkageVarDefinition(const VarDecl *D,
1942 llvm::GlobalVariable *GV) {
1943 GVALinkage Linkage = getContext().GetGVALinkageForVariable(D);
1944 if (Linkage == GVA_Internal)
1945 return llvm::Function::InternalLinkage;
1946 else if (D->hasAttr<DLLImportAttr>())
1947 return llvm::Function::DLLImportLinkage;
1948 else if (D->hasAttr<DLLExportAttr>())
1949 return llvm::Function::DLLExportLinkage;
Reid Klecknera7225342013-05-20 14:02:37 +00001950 else if (D->hasAttr<SelectAnyAttr>()) {
1951 // selectany symbols are externally visible, so use weak instead of
1952 // linkonce. MSVC optimizes away references to const selectany globals, so
1953 // all definitions should be the same and ODR linkage should be used.
1954 // http://msdn.microsoft.com/en-us/library/5tkz6s71.aspx
1955 return llvm::GlobalVariable::WeakODRLinkage;
1956 } else if (D->hasAttr<WeakAttr>()) {
Fariborz Jahanian354e7122010-10-27 16:21:54 +00001957 if (GV->isConstant())
1958 return llvm::GlobalVariable::WeakODRLinkage;
1959 else
1960 return llvm::GlobalVariable::WeakAnyLinkage;
1961 } else if (Linkage == GVA_TemplateInstantiation ||
1962 Linkage == GVA_ExplicitTemplateInstantiation)
John McCall99ace162011-04-12 01:46:54 +00001963 return llvm::GlobalVariable::WeakODRLinkage;
David Blaikie4e4d0842012-03-11 07:00:24 +00001964 else if (!getLangOpts().CPlusPlus &&
Eric Christophera6cf1e72010-12-02 02:45:55 +00001965 ((!CodeGenOpts.NoCommon && !D->getAttr<NoCommonAttr>()) ||
1966 D->getAttr<CommonAttr>()) &&
Fariborz Jahanian354e7122010-10-27 16:21:54 +00001967 !D->hasExternalStorage() && !D->getInit() &&
Richard Smith38afbc72013-04-13 02:43:54 +00001968 !D->getAttr<SectionAttr>() && !D->getTLSKind() &&
Fariborz Jahanianab27d6e2011-06-20 17:50:03 +00001969 !D->getAttr<WeakImportAttr>()) {
Fariborz Jahanian354e7122010-10-27 16:21:54 +00001970 // Thread local vars aren't considered common linkage.
1971 return llvm::GlobalVariable::CommonLinkage;
Bill Wendling4e3b54b2013-05-02 19:18:03 +00001972 } else if (D->getTLSKind() == VarDecl::TLS_Dynamic &&
1973 getTarget().getTriple().isMacOSX())
1974 // On Darwin, the backing variable for a C++11 thread_local variable always
1975 // has internal linkage; all accesses should just be calls to the
1976 // Itanium-specified entry point, which has the normal linkage of the
1977 // variable.
1978 return llvm::GlobalValue::InternalLinkage;
Fariborz Jahanian354e7122010-10-27 16:21:54 +00001979 return llvm::GlobalVariable::ExternalLinkage;
1980}
1981
John McCalla923c972012-12-12 22:21:47 +00001982/// Replace the uses of a function that was declared with a non-proto type.
1983/// We want to silently drop extra arguments from call sites
1984static void replaceUsesOfNonProtoConstant(llvm::Constant *old,
1985 llvm::Function *newFn) {
1986 // Fast path.
1987 if (old->use_empty()) return;
1988
1989 llvm::Type *newRetTy = newFn->getReturnType();
1990 SmallVector<llvm::Value*, 4> newArgs;
1991
1992 for (llvm::Value::use_iterator ui = old->use_begin(), ue = old->use_end();
1993 ui != ue; ) {
1994 llvm::Value::use_iterator use = ui++; // Increment before the use is erased.
1995 llvm::User *user = *use;
1996
1997 // Recognize and replace uses of bitcasts. Most calls to
1998 // unprototyped functions will use bitcasts.
1999 if (llvm::ConstantExpr *bitcast = dyn_cast<llvm::ConstantExpr>(user)) {
2000 if (bitcast->getOpcode() == llvm::Instruction::BitCast)
2001 replaceUsesOfNonProtoConstant(bitcast, newFn);
2002 continue;
2003 }
2004
2005 // Recognize calls to the function.
2006 llvm::CallSite callSite(user);
2007 if (!callSite) continue;
2008 if (!callSite.isCallee(use)) continue;
2009
2010 // If the return types don't match exactly, then we can't
2011 // transform this call unless it's dead.
2012 if (callSite->getType() != newRetTy && !callSite->use_empty())
2013 continue;
2014
2015 // Get the call site's attribute list.
Bill Wendlingb263bdf2013-01-27 02:46:53 +00002016 SmallVector<llvm::AttributeSet, 8> newAttrs;
John McCalla923c972012-12-12 22:21:47 +00002017 llvm::AttributeSet oldAttrs = callSite.getAttributes();
2018
2019 // Collect any return attributes from the call.
Bill Wendlinga37ce612013-01-21 21:57:40 +00002020 if (oldAttrs.hasAttributes(llvm::AttributeSet::ReturnIndex))
Bill Wendlinged01f842013-01-21 22:45:00 +00002021 newAttrs.push_back(
Bill Wendlingb263bdf2013-01-27 02:46:53 +00002022 llvm::AttributeSet::get(newFn->getContext(),
2023 oldAttrs.getRetAttributes()));
John McCalla923c972012-12-12 22:21:47 +00002024
2025 // If the function was passed too few arguments, don't transform.
2026 unsigned newNumArgs = newFn->arg_size();
2027 if (callSite.arg_size() < newNumArgs) continue;
2028
2029 // If extra arguments were passed, we silently drop them.
2030 // If any of the types mismatch, we don't transform.
2031 unsigned argNo = 0;
2032 bool dontTransform = false;
2033 for (llvm::Function::arg_iterator ai = newFn->arg_begin(),
2034 ae = newFn->arg_end(); ai != ae; ++ai, ++argNo) {
2035 if (callSite.getArgument(argNo)->getType() != ai->getType()) {
2036 dontTransform = true;
2037 break;
2038 }
2039
2040 // Add any parameter attributes.
Bill Wendling89530e42013-01-23 06:15:10 +00002041 if (oldAttrs.hasAttributes(argNo + 1))
2042 newAttrs.
Bill Wendlingb263bdf2013-01-27 02:46:53 +00002043 push_back(llvm::
2044 AttributeSet::get(newFn->getContext(),
2045 oldAttrs.getParamAttributes(argNo + 1)));
John McCalla923c972012-12-12 22:21:47 +00002046 }
2047 if (dontTransform)
2048 continue;
2049
Bill Wendlinge67e4c92013-01-18 21:26:07 +00002050 if (oldAttrs.hasAttributes(llvm::AttributeSet::FunctionIndex))
Bill Wendlingb263bdf2013-01-27 02:46:53 +00002051 newAttrs.push_back(llvm::AttributeSet::get(newFn->getContext(),
2052 oldAttrs.getFnAttributes()));
John McCalla923c972012-12-12 22:21:47 +00002053
2054 // Okay, we can transform this. Create the new call instruction and copy
2055 // over the required information.
2056 newArgs.append(callSite.arg_begin(), callSite.arg_begin() + argNo);
2057
2058 llvm::CallSite newCall;
2059 if (callSite.isCall()) {
2060 newCall = llvm::CallInst::Create(newFn, newArgs, "",
2061 callSite.getInstruction());
2062 } else {
2063 llvm::InvokeInst *oldInvoke =
2064 cast<llvm::InvokeInst>(callSite.getInstruction());
2065 newCall = llvm::InvokeInst::Create(newFn,
2066 oldInvoke->getNormalDest(),
2067 oldInvoke->getUnwindDest(),
2068 newArgs, "",
2069 callSite.getInstruction());
2070 }
2071 newArgs.clear(); // for the next iteration
2072
2073 if (!newCall->getType()->isVoidTy())
2074 newCall->takeName(callSite.getInstruction());
2075 newCall.setAttributes(
2076 llvm::AttributeSet::get(newFn->getContext(), newAttrs));
2077 newCall.setCallingConv(callSite.getCallingConv());
2078
2079 // Finally, remove the old call, replacing any uses with the new one.
2080 if (!callSite->use_empty())
2081 callSite->replaceAllUsesWith(newCall.getInstruction());
2082
2083 // Copy debug location attached to CI.
2084 if (!callSite->getDebugLoc().isUnknown())
2085 newCall->setDebugLoc(callSite->getDebugLoc());
2086 callSite->eraseFromParent();
2087 }
2088}
2089
Chris Lattnerbdb01322009-05-05 06:16:31 +00002090/// ReplaceUsesOfNonProtoTypeWithRealFunction - This function is called when we
2091/// implement a function with no prototype, e.g. "int foo() {}". If there are
2092/// existing call uses of the old function in the module, this adjusts them to
2093/// call the new function directly.
2094///
2095/// This is not just a cleanup: the always_inline pass requires direct calls to
2096/// functions to be able to inline them. If there is a bitcast in the way, it
2097/// won't inline them. Instcombine normally deletes these calls, but it isn't
2098/// run at -O0.
2099static void ReplaceUsesOfNonProtoTypeWithRealFunction(llvm::GlobalValue *Old,
2100 llvm::Function *NewFn) {
2101 // If we're redefining a global as a function, don't transform it.
John McCalla923c972012-12-12 22:21:47 +00002102 if (!isa<llvm::Function>(Old)) return;
Mike Stump1eb44332009-09-09 15:08:12 +00002103
John McCalla923c972012-12-12 22:21:47 +00002104 replaceUsesOfNonProtoConstant(Old, NewFn);
Chris Lattnerbdb01322009-05-05 06:16:31 +00002105}
2106
Rafael Espindola02503932012-03-08 15:51:03 +00002107void CodeGenModule::HandleCXXStaticMemberVarInstantiation(VarDecl *VD) {
2108 TemplateSpecializationKind TSK = VD->getTemplateSpecializationKind();
2109 // If we have a definition, this might be a deferred decl. If the
2110 // instantiation is explicit, make sure we emit it at the end.
2111 if (VD->getDefinition() && TSK == TSK_ExplicitInstantiationDefinition)
2112 GetAddrOfGlobalVar(VD);
Argyrios Kyrtzidisafda9052013-02-24 00:05:01 +00002113
2114 EmitTopLevelDecl(VD);
Rafael Espindola234fe652012-03-05 10:54:55 +00002115}
Daniel Dunbarbd012ff2008-07-29 23:18:29 +00002116
Chris Lattnerb4880ba2009-05-12 21:21:08 +00002117void CodeGenModule::EmitGlobalFunctionDefinition(GlobalDecl GD) {
Chris Lattnerb4880ba2009-05-12 21:21:08 +00002118 const FunctionDecl *D = cast<FunctionDecl>(GD.getDecl());
John McCalld26bc762011-03-09 04:27:21 +00002119
John McCall1f6f9612011-03-09 08:12:35 +00002120 // Compute the function info and LLVM type.
John McCallde5d3c72012-02-17 03:33:10 +00002121 const CGFunctionInfo &FI = getTypes().arrangeGlobalDeclaration(GD);
2122 llvm::FunctionType *Ty = getTypes().GetFunctionType(FI);
John McCalld26bc762011-03-09 04:27:21 +00002123
Chris Lattner9fa959d2009-05-12 20:58:15 +00002124 // Get or create the prototype for the function.
Chris Lattnerb4880ba2009-05-12 21:21:08 +00002125 llvm::Constant *Entry = GetAddrOfFunction(GD, Ty);
Mike Stump1eb44332009-09-09 15:08:12 +00002126
Chris Lattner0558e792009-03-21 09:25:43 +00002127 // Strip off a bitcast if we got one back.
2128 if (llvm::ConstantExpr *CE = dyn_cast<llvm::ConstantExpr>(Entry)) {
2129 assert(CE->getOpcode() == llvm::Instruction::BitCast);
2130 Entry = CE->getOperand(0);
2131 }
Mike Stump1eb44332009-09-09 15:08:12 +00002132
2133
Chris Lattner0558e792009-03-21 09:25:43 +00002134 if (cast<llvm::GlobalValue>(Entry)->getType()->getElementType() != Ty) {
Chris Lattnerbdb01322009-05-05 06:16:31 +00002135 llvm::GlobalValue *OldFn = cast<llvm::GlobalValue>(Entry);
Mike Stump1eb44332009-09-09 15:08:12 +00002136
Daniel Dunbar42745812009-03-09 23:53:08 +00002137 // If the types mismatch then we have to rewrite the definition.
Chris Lattnerbdb01322009-05-05 06:16:31 +00002138 assert(OldFn->isDeclaration() &&
Chris Lattner0558e792009-03-21 09:25:43 +00002139 "Shouldn't replace non-declaration");
Chris Lattner34809502009-03-21 08:53:37 +00002140
Chris Lattner62b33ea2009-03-21 08:38:50 +00002141 // F is the Function* for the one with the wrong type, we must make a new
2142 // Function* and update everything that used F (a declaration) with the new
2143 // Function* (which will be a definition).
2144 //
2145 // This happens if there is a prototype for a function
2146 // (e.g. "int f()") and then a definition of a different type
John McCallf746aa62010-03-19 23:29:14 +00002147 // (e.g. "int f(int x)"). Move the old function aside so that it
2148 // doesn't interfere with GetAddrOfFunction.
Chris Lattner5f9e2722011-07-23 10:55:15 +00002149 OldFn->setName(StringRef());
Chris Lattnerb4880ba2009-05-12 21:21:08 +00002150 llvm::Function *NewFn = cast<llvm::Function>(GetAddrOfFunction(GD, Ty));
Mike Stump1eb44332009-09-09 15:08:12 +00002151
John McCalla923c972012-12-12 22:21:47 +00002152 // This might be an implementation of a function without a
2153 // prototype, in which case, try to do special replacement of
2154 // calls which match the new prototype. The really key thing here
2155 // is that we also potentially drop arguments from the call site
2156 // so as to make a direct call, which makes the inliner happier
2157 // and suppresses a number of optimizer warnings (!) about
2158 // dropping arguments.
2159 if (!OldFn->use_empty()) {
Chris Lattnerbdb01322009-05-05 06:16:31 +00002160 ReplaceUsesOfNonProtoTypeWithRealFunction(OldFn, NewFn);
Chris Lattner9fa959d2009-05-12 20:58:15 +00002161 OldFn->removeDeadConstantUsers();
2162 }
Mike Stump1eb44332009-09-09 15:08:12 +00002163
Chris Lattner62b33ea2009-03-21 08:38:50 +00002164 // Replace uses of F with the Function we will endow with a body.
Chris Lattnerbdb01322009-05-05 06:16:31 +00002165 if (!Entry->use_empty()) {
Mike Stump1eb44332009-09-09 15:08:12 +00002166 llvm::Constant *NewPtrForOldDecl =
Owen Anderson3c4972d2009-07-29 18:54:39 +00002167 llvm::ConstantExpr::getBitCast(NewFn, Entry->getType());
Chris Lattnerbdb01322009-05-05 06:16:31 +00002168 Entry->replaceAllUsesWith(NewPtrForOldDecl);
2169 }
Mike Stump1eb44332009-09-09 15:08:12 +00002170
Chris Lattner62b33ea2009-03-21 08:38:50 +00002171 // Ok, delete the old function now, which is dead.
Chris Lattnerbdb01322009-05-05 06:16:31 +00002172 OldFn->eraseFromParent();
Mike Stump1eb44332009-09-09 15:08:12 +00002173
Chris Lattner0558e792009-03-21 09:25:43 +00002174 Entry = NewFn;
Daniel Dunbarbd012ff2008-07-29 23:18:29 +00002175 }
Mike Stump1eb44332009-09-09 15:08:12 +00002176
John McCall112c9672010-11-02 21:04:24 +00002177 // We need to set linkage and visibility on the function before
2178 // generating code for it because various parts of IR generation
2179 // want to propagate this information down (e.g. to local static
2180 // declarations).
Chris Lattner0558e792009-03-21 09:25:43 +00002181 llvm::Function *Fn = cast<llvm::Function>(Entry);
Peter Collingbourne144a31f2013-06-05 17:49:37 +00002182 setFunctionLinkage(GD, Fn);
Daniel Dunbarbd012ff2008-07-29 23:18:29 +00002183
John McCall112c9672010-11-02 21:04:24 +00002184 // FIXME: this is redundant with part of SetFunctionDefinitionAttributes
Anders Carlsson0ffeaad2011-01-29 19:39:23 +00002185 setGlobalVisibility(Fn, D);
John McCall112c9672010-11-02 21:04:24 +00002186
Richard Smith00249372013-04-06 05:00:46 +00002187 MaybeHandleStaticInExternC(D, Fn);
2188
John McCalld26bc762011-03-09 04:27:21 +00002189 CodeGenFunction(*this).GenerateCode(D, Fn, FI);
Daniel Dunbar6bfed7e2008-08-01 00:01:51 +00002190
Daniel Dunbar7c65e992009-04-14 08:05:55 +00002191 SetFunctionDefinitionAttributes(D, Fn);
2192 SetLLVMFunctionAttributesForDefinition(D, Fn);
Mike Stump1eb44332009-09-09 15:08:12 +00002193
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +00002194 if (const ConstructorAttr *CA = D->getAttr<ConstructorAttr>())
Daniel Dunbar219df662008-09-08 23:44:31 +00002195 AddGlobalCtor(Fn, CA->getPriority());
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +00002196 if (const DestructorAttr *DA = D->getAttr<DestructorAttr>())
Daniel Dunbar219df662008-09-08 23:44:31 +00002197 AddGlobalDtor(Fn, DA->getPriority());
Julien Lerouge77f68bb2011-09-09 22:41:49 +00002198 if (D->hasAttr<AnnotateAttr>())
2199 AddGlobalAnnotations(D, Fn);
Daniel Dunbarbd012ff2008-07-29 23:18:29 +00002200}
2201
John McCallf746aa62010-03-19 23:29:14 +00002202void CodeGenModule::EmitAliasDefinition(GlobalDecl GD) {
2203 const ValueDecl *D = cast<ValueDecl>(GD.getDecl());
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +00002204 const AliasAttr *AA = D->getAttr<AliasAttr>();
Chris Lattnerbd532712009-03-22 21:47:11 +00002205 assert(AA && "Not an alias?");
2206
Chris Lattner5f9e2722011-07-23 10:55:15 +00002207 StringRef MangledName = getMangledName(GD);
Mike Stump1eb44332009-09-09 15:08:12 +00002208
John McCallf746aa62010-03-19 23:29:14 +00002209 // If there is a definition in the module, then it wins over the alias.
2210 // This is dubious, but allow it to be safe. Just ignore the alias.
2211 llvm::GlobalValue *Entry = GetGlobalValue(MangledName);
2212 if (Entry && !Entry->isDeclaration())
2213 return;
2214
Chris Lattner2acc6e32011-07-18 04:24:23 +00002215 llvm::Type *DeclTy = getTypes().ConvertTypeForMem(D->getType());
Chris Lattnerbd532712009-03-22 21:47:11 +00002216
2217 // Create a reference to the named value. This ensures that it is emitted
2218 // if a deferred decl.
2219 llvm::Constant *Aliasee;
2220 if (isa<llvm::FunctionType>(DeclTy))
Alex Rosenbergc857ce82012-10-05 23:12:53 +00002221 Aliasee = GetOrCreateLLVMFunction(AA->getAliasee(), DeclTy, GD,
Anders Carlsson1faa89f2011-02-05 04:35:53 +00002222 /*ForVTable=*/false);
Chris Lattnerbd532712009-03-22 21:47:11 +00002223 else
John McCallf746aa62010-03-19 23:29:14 +00002224 Aliasee = GetOrCreateLLVMGlobal(AA->getAliasee(),
Owen Anderson96e0fc72009-07-29 22:16:19 +00002225 llvm::PointerType::getUnqual(DeclTy), 0);
Chris Lattnerbd532712009-03-22 21:47:11 +00002226
2227 // Create the new alias itself, but don't set a name yet.
Mike Stump1eb44332009-09-09 15:08:12 +00002228 llvm::GlobalValue *GA =
Chris Lattnerbd532712009-03-22 21:47:11 +00002229 new llvm::GlobalAlias(Aliasee->getType(),
2230 llvm::Function::ExternalLinkage,
2231 "", Aliasee, &getModule());
Mike Stump1eb44332009-09-09 15:08:12 +00002232
Chris Lattnerbd532712009-03-22 21:47:11 +00002233 if (Entry) {
John McCallf746aa62010-03-19 23:29:14 +00002234 assert(Entry->isDeclaration());
2235
Chris Lattnerbd532712009-03-22 21:47:11 +00002236 // If there is a declaration in the module, then we had an extern followed
2237 // by the alias, as in:
2238 // extern int test6();
2239 // ...
2240 // int test6() __attribute__((alias("test7")));
2241 //
2242 // Remove it and replace uses of it with the alias.
John McCallf746aa62010-03-19 23:29:14 +00002243 GA->takeName(Entry);
Mike Stump1eb44332009-09-09 15:08:12 +00002244
Owen Anderson3c4972d2009-07-29 18:54:39 +00002245 Entry->replaceAllUsesWith(llvm::ConstantExpr::getBitCast(GA,
Chris Lattnerbd532712009-03-22 21:47:11 +00002246 Entry->getType()));
Chris Lattnerbd532712009-03-22 21:47:11 +00002247 Entry->eraseFromParent();
John McCallf746aa62010-03-19 23:29:14 +00002248 } else {
Anders Carlsson9a20d552010-06-22 16:16:50 +00002249 GA->setName(MangledName);
Chris Lattnerbd532712009-03-22 21:47:11 +00002250 }
Mike Stump1eb44332009-09-09 15:08:12 +00002251
Daniel Dunbar7c65e992009-04-14 08:05:55 +00002252 // Set attributes which are particular to an alias; this is a
2253 // specialization of the attributes which may be set on a global
2254 // variable/function.
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +00002255 if (D->hasAttr<DLLExportAttr>()) {
Daniel Dunbar7c65e992009-04-14 08:05:55 +00002256 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
2257 // The dllexport attribute is ignored for undefined symbols.
Argyrios Kyrtzidis06a54a32010-07-07 11:31:19 +00002258 if (FD->hasBody())
Daniel Dunbar7c65e992009-04-14 08:05:55 +00002259 GA->setLinkage(llvm::Function::DLLExportLinkage);
2260 } else {
2261 GA->setLinkage(llvm::Function::DLLExportLinkage);
2262 }
Mike Stump1eb44332009-09-09 15:08:12 +00002263 } else if (D->hasAttr<WeakAttr>() ||
Rafael Espindola11e8ce72010-02-23 22:00:30 +00002264 D->hasAttr<WeakRefAttr>() ||
Douglas Gregor0a0d2b12011-03-23 00:50:03 +00002265 D->isWeakImported()) {
Daniel Dunbar7c65e992009-04-14 08:05:55 +00002266 GA->setLinkage(llvm::Function::WeakAnyLinkage);
2267 }
2268
2269 SetCommonAttributes(D, GA);
Chris Lattnerbd532712009-03-22 21:47:11 +00002270}
2271
Benjamin Kramer8dd55a32011-07-14 17:45:50 +00002272llvm::Function *CodeGenModule::getIntrinsic(unsigned IID,
Chris Lattner2d3ba4f2011-07-23 17:14:25 +00002273 ArrayRef<llvm::Type*> Tys) {
Jay Foaddf983a82011-07-12 14:06:48 +00002274 return llvm::Intrinsic::getDeclaration(&getModule(), (llvm::Intrinsic::ID)IID,
Benjamin Kramer8dd55a32011-07-14 17:45:50 +00002275 Tys);
Chris Lattner7acda7c2007-12-18 00:25:38 +00002276}
Chris Lattnerbef20ac2007-08-31 04:31:45 +00002277
Daniel Dunbar1d552912009-07-23 22:52:48 +00002278static llvm::StringMapEntry<llvm::Constant*> &
2279GetConstantCFStringEntry(llvm::StringMap<llvm::Constant*> &Map,
2280 const StringLiteral *Literal,
Daniel Dunbar70ee9752009-07-23 23:41:22 +00002281 bool TargetIsLSB,
Daniel Dunbar1d552912009-07-23 22:52:48 +00002282 bool &IsUTF16,
2283 unsigned &StringLength) {
Chris Lattner5f9e2722011-07-23 10:55:15 +00002284 StringRef String = Literal->getString();
Benjamin Kramer2f4eaef2010-08-17 12:54:38 +00002285 unsigned NumBytes = String.size();
Daniel Dunbar1d552912009-07-23 22:52:48 +00002286
Daniel Dunbarf015b032009-09-22 10:03:52 +00002287 // Check for simple case.
2288 if (!Literal->containsNonAsciiOrNull()) {
2289 StringLength = NumBytes;
Benjamin Kramer2f4eaef2010-08-17 12:54:38 +00002290 return Map.GetOrCreateValue(String);
Daniel Dunbarf015b032009-09-22 10:03:52 +00002291 }
2292
Bill Wendling84392d02012-03-30 00:26:17 +00002293 // Otherwise, convert the UTF8 literals into a string of shorts.
2294 IsUTF16 = true;
2295
2296 SmallVector<UTF16, 128> ToBuf(NumBytes + 1); // +1 for ending nulls.
Roman Divacky31ba6132012-09-06 15:59:27 +00002297 const UTF8 *FromPtr = (const UTF8 *)String.data();
Daniel Dunbar1d552912009-07-23 22:52:48 +00002298 UTF16 *ToPtr = &ToBuf[0];
Mike Stump1eb44332009-09-09 15:08:12 +00002299
Fariborz Jahaniane7ddfb92010-09-07 19:57:04 +00002300 (void)ConvertUTF8toUTF16(&FromPtr, FromPtr + NumBytes,
2301 &ToPtr, ToPtr + NumBytes,
2302 strictConversion);
Mike Stump1eb44332009-09-09 15:08:12 +00002303
Daniel Dunbar70ee9752009-07-23 23:41:22 +00002304 // ConvertUTF8toUTF16 returns the length in ToPtr.
Daniel Dunbar1d552912009-07-23 22:52:48 +00002305 StringLength = ToPtr - &ToBuf[0];
Daniel Dunbar70ee9752009-07-23 23:41:22 +00002306
Bill Wendling84392d02012-03-30 00:26:17 +00002307 // Add an explicit null.
2308 *ToPtr = 0;
2309 return Map.
2310 GetOrCreateValue(StringRef(reinterpret_cast<const char *>(ToBuf.data()),
2311 (StringLength + 1) * 2));
Daniel Dunbar1d552912009-07-23 22:52:48 +00002312}
2313
Fariborz Jahaniancf8e1682011-05-13 18:13:10 +00002314static llvm::StringMapEntry<llvm::Constant*> &
2315GetConstantStringEntry(llvm::StringMap<llvm::Constant*> &Map,
Bill Wendling8322c232012-03-29 22:12:09 +00002316 const StringLiteral *Literal,
2317 unsigned &StringLength) {
2318 StringRef String = Literal->getString();
2319 StringLength = String.size();
2320 return Map.GetOrCreateValue(String);
Fariborz Jahaniancf8e1682011-05-13 18:13:10 +00002321}
2322
Daniel Dunbar1d552912009-07-23 22:52:48 +00002323llvm::Constant *
2324CodeGenModule::GetAddrOfConstantCFString(const StringLiteral *Literal) {
2325 unsigned StringLength = 0;
2326 bool isUTF16 = false;
2327 llvm::StringMapEntry<llvm::Constant*> &Entry =
Mike Stump1eb44332009-09-09 15:08:12 +00002328 GetConstantCFStringEntry(CFConstantStringMap, Literal,
Micah Villmow25a6a842012-10-08 16:25:52 +00002329 getDataLayout().isLittleEndian(),
Daniel Dunbar70ee9752009-07-23 23:41:22 +00002330 isUTF16, StringLength);
Mike Stump1eb44332009-09-09 15:08:12 +00002331
Daniel Dunbar1d552912009-07-23 22:52:48 +00002332 if (llvm::Constant *C = Entry.getValue())
2333 return C;
Mike Stump1eb44332009-09-09 15:08:12 +00002334
Chris Lattner8b418682012-02-07 00:39:47 +00002335 llvm::Constant *Zero = llvm::Constant::getNullValue(Int32Ty);
Daniel Dunbar3e9df992008-08-23 18:37:06 +00002336 llvm::Constant *Zeros[] = { Zero, Zero };
Fariborz Jahanian428edb72013-04-16 15:25:39 +00002337 llvm::Value *V;
2338
Chris Lattner9d4a15f2009-07-16 16:48:25 +00002339 // If we don't already have it, get __CFConstantStringClassReference.
Anders Carlssonc9e20912007-08-21 00:21:21 +00002340 if (!CFConstantStringClassRef) {
Chris Lattner2acc6e32011-07-18 04:24:23 +00002341 llvm::Type *Ty = getTypes().ConvertType(getContext().IntTy);
Owen Anderson96e0fc72009-07-29 22:16:19 +00002342 Ty = llvm::ArrayType::get(Ty, 0);
Mike Stump1eb44332009-09-09 15:08:12 +00002343 llvm::Constant *GV = CreateRuntimeVariable(Ty,
Chris Lattner9d4a15f2009-07-16 16:48:25 +00002344 "__CFConstantStringClassReference");
Daniel Dunbar3e9df992008-08-23 18:37:06 +00002345 // Decay array -> ptr
Fariborz Jahanian428edb72013-04-16 15:25:39 +00002346 V = llvm::ConstantExpr::getGetElementPtr(GV, Zeros);
2347 CFConstantStringClassRef = V;
Anders Carlssonc9e20912007-08-21 00:21:21 +00002348 }
Fariborz Jahanian428edb72013-04-16 15:25:39 +00002349 else
2350 V = CFConstantStringClassRef;
Mike Stump1eb44332009-09-09 15:08:12 +00002351
Anders Carlssone3daa762008-11-15 18:54:24 +00002352 QualType CFTy = getContext().getCFConstantStringType();
Daniel Dunbar3e9df992008-08-23 18:37:06 +00002353
Chris Lattner2acc6e32011-07-18 04:24:23 +00002354 llvm::StructType *STy =
Anders Carlssone3daa762008-11-15 18:54:24 +00002355 cast<llvm::StructType>(getTypes().ConvertType(CFTy));
2356
Benjamin Kramer1d236ab2011-10-15 12:20:02 +00002357 llvm::Constant *Fields[4];
Douglas Gregor44b43212008-12-11 16:49:14 +00002358
Anders Carlssonc9e20912007-08-21 00:21:21 +00002359 // Class pointer.
Fariborz Jahanian428edb72013-04-16 15:25:39 +00002360 Fields[0] = cast<llvm::ConstantExpr>(V);
Mike Stump1eb44332009-09-09 15:08:12 +00002361
Anders Carlssonc9e20912007-08-21 00:21:21 +00002362 // Flags.
Chris Lattner2acc6e32011-07-18 04:24:23 +00002363 llvm::Type *Ty = getTypes().ConvertType(getContext().UnsignedIntTy);
Mike Stump1eb44332009-09-09 15:08:12 +00002364 Fields[1] = isUTF16 ? llvm::ConstantInt::get(Ty, 0x07d0) :
Anders Carlsson5add6832009-08-16 05:55:31 +00002365 llvm::ConstantInt::get(Ty, 0x07C8);
2366
Anders Carlssonc9e20912007-08-21 00:21:21 +00002367 // String pointer.
Bill Wendling84392d02012-03-30 00:26:17 +00002368 llvm::Constant *C = 0;
2369 if (isUTF16) {
2370 ArrayRef<uint16_t> Arr =
David Greene5ba58a12013-01-15 22:09:41 +00002371 llvm::makeArrayRef<uint16_t>(reinterpret_cast<uint16_t*>(
2372 const_cast<char *>(Entry.getKey().data())),
Bill Wendling84392d02012-03-30 00:26:17 +00002373 Entry.getKey().size() / 2);
2374 C = llvm::ConstantDataArray::get(VMContext, Arr);
2375 } else {
2376 C = llvm::ConstantDataArray::getString(VMContext, Entry.getKey());
2377 }
Daniel Dunbara9668e02009-04-03 00:57:44 +00002378
Chris Lattner95b851e2009-07-16 05:03:48 +00002379 llvm::GlobalValue::LinkageTypes Linkage;
Bill Wendling1bf7a3f2012-01-10 08:46:39 +00002380 if (isUTF16)
Chris Lattner278b9f02009-10-14 05:55:45 +00002381 // FIXME: why do utf strings get "_" labels instead of "L" labels?
Chris Lattner95b851e2009-07-16 05:03:48 +00002382 Linkage = llvm::GlobalValue::InternalLinkage;
Bill Wendling1bf7a3f2012-01-10 08:46:39 +00002383 else
Rafael Espindola584acf22011-03-14 17:55:00 +00002384 // FIXME: With OS X ld 123.2 (xcode 4) and LTO we would get a linker error
2385 // when using private linkage. It is not clear if this is a bug in ld
2386 // or a reasonable new restriction.
Rafael Espindoladc0f1372011-03-14 21:08:19 +00002387 Linkage = llvm::GlobalValue::LinkerPrivateLinkage;
Chris Lattner278b9f02009-10-14 05:55:45 +00002388
Bill Wendling1bf7a3f2012-01-10 08:46:39 +00002389 // Note: -fwritable-strings doesn't make the backing store strings of
2390 // CFStrings writable. (See <rdar://problem/10657500>)
Mike Stump1eb44332009-09-09 15:08:12 +00002391 llvm::GlobalVariable *GV =
Bill Wendling1bf7a3f2012-01-10 08:46:39 +00002392 new llvm::GlobalVariable(getModule(), C->getType(), /*isConstant=*/true,
2393 Linkage, C, ".str");
Rafael Espindolab266a1f2011-01-17 16:31:00 +00002394 GV->setUnnamedAddr(true);
Ulrich Weigand6b203512013-05-06 16:23:57 +00002395 // Don't enforce the target's minimum global alignment, since the only use
2396 // of the string is via this class initializer.
Daniel Dunbara9668e02009-04-03 00:57:44 +00002397 if (isUTF16) {
Ken Dyck4da244c2010-01-26 18:46:23 +00002398 CharUnits Align = getContext().getTypeAlignInChars(getContext().ShortTy);
2399 GV->setAlignment(Align.getQuantity());
Daniel Dunbarf7e903d2011-04-12 23:30:52 +00002400 } else {
2401 CharUnits Align = getContext().getTypeAlignInChars(getContext().CharTy);
2402 GV->setAlignment(Align.getQuantity());
Daniel Dunbara9668e02009-04-03 00:57:44 +00002403 }
Bill Wendling84392d02012-03-30 00:26:17 +00002404
2405 // String.
Jay Foada5c04342011-07-21 14:31:17 +00002406 Fields[2] = llvm::ConstantExpr::getGetElementPtr(GV, Zeros);
Anders Carlsson5add6832009-08-16 05:55:31 +00002407
Bill Wendling84392d02012-03-30 00:26:17 +00002408 if (isUTF16)
2409 // Cast the UTF16 string to the correct type.
2410 Fields[2] = llvm::ConstantExpr::getBitCast(Fields[2], Int8PtrTy);
2411
Anders Carlssonc9e20912007-08-21 00:21:21 +00002412 // String length.
2413 Ty = getTypes().ConvertType(getContext().LongTy);
Anders Carlsson5add6832009-08-16 05:55:31 +00002414 Fields[3] = llvm::ConstantInt::get(Ty, StringLength);
Mike Stump1eb44332009-09-09 15:08:12 +00002415
Anders Carlssonc9e20912007-08-21 00:21:21 +00002416 // The struct.
Owen Anderson08e25242009-07-27 22:29:56 +00002417 C = llvm::ConstantStruct::get(STy, Fields);
Mike Stump1eb44332009-09-09 15:08:12 +00002418 GV = new llvm::GlobalVariable(getModule(), C->getType(), true,
2419 llvm::GlobalVariable::PrivateLinkage, C,
Chris Lattner95b851e2009-07-16 05:03:48 +00002420 "_unnamed_cfstring_");
John McCall64aa4b32013-04-16 22:48:15 +00002421 if (const char *Sect = getTarget().getCFStringSection())
Daniel Dunbar8e5c2b82009-03-31 23:42:16 +00002422 GV->setSection(Sect);
Daniel Dunbar1d552912009-07-23 22:52:48 +00002423 Entry.setValue(GV);
Mike Stump1eb44332009-09-09 15:08:12 +00002424
Anders Carlsson0c678292007-11-01 00:41:52 +00002425 return GV;
Anders Carlssonc9e20912007-08-21 00:21:21 +00002426}
Chris Lattner45e8cbd2007-11-28 05:34:05 +00002427
Douglas Gregor45c4ea72011-08-09 15:54:21 +00002428static RecordDecl *
2429CreateRecordDecl(const ASTContext &Ctx, RecordDecl::TagKind TK,
2430 DeclContext *DC, IdentifierInfo *Id) {
2431 SourceLocation Loc;
David Blaikie4e4d0842012-03-11 07:00:24 +00002432 if (Ctx.getLangOpts().CPlusPlus)
Douglas Gregor45c4ea72011-08-09 15:54:21 +00002433 return CXXRecordDecl::Create(Ctx, TK, DC, Loc, Loc, Id);
2434 else
2435 return RecordDecl::Create(Ctx, TK, DC, Loc, Loc, Id);
2436}
2437
Fariborz Jahanian33e982b2010-04-22 20:26:39 +00002438llvm::Constant *
Fariborz Jahanian4c733072010-10-19 17:19:29 +00002439CodeGenModule::GetAddrOfConstantString(const StringLiteral *Literal) {
Fariborz Jahanian2bb5dda2010-04-23 17:41:07 +00002440 unsigned StringLength = 0;
Fariborz Jahanian2bb5dda2010-04-23 17:41:07 +00002441 llvm::StringMapEntry<llvm::Constant*> &Entry =
Fariborz Jahaniancf8e1682011-05-13 18:13:10 +00002442 GetConstantStringEntry(CFConstantStringMap, Literal, StringLength);
Fariborz Jahanian2bb5dda2010-04-23 17:41:07 +00002443
2444 if (llvm::Constant *C = Entry.getValue())
2445 return C;
2446
Chris Lattner812234b2012-02-06 22:47:00 +00002447 llvm::Constant *Zero = llvm::Constant::getNullValue(Int32Ty);
Fariborz Jahanian2bb5dda2010-04-23 17:41:07 +00002448 llvm::Constant *Zeros[] = { Zero, Zero };
Fariborz Jahanian428edb72013-04-16 15:25:39 +00002449 llvm::Value *V;
Fariborz Jahanianec951e02010-04-23 22:33:39 +00002450 // If we don't already have it, get _NSConstantStringClassReference.
Fariborz Jahanian4c733072010-10-19 17:19:29 +00002451 if (!ConstantStringClassRef) {
David Blaikie4e4d0842012-03-11 07:00:24 +00002452 std::string StringClass(getLangOpts().ObjCConstantStringClass);
Chris Lattner2acc6e32011-07-18 04:24:23 +00002453 llvm::Type *Ty = getTypes().ConvertType(getContext().IntTy);
Fariborz Jahanian4c733072010-10-19 17:19:29 +00002454 llvm::Constant *GV;
John McCall260611a2012-06-20 06:18:46 +00002455 if (LangOpts.ObjCRuntime.isNonFragile()) {
Fariborz Jahanian25dba5d2011-05-17 22:46:11 +00002456 std::string str =
2457 StringClass.empty() ? "OBJC_CLASS_$_NSConstantString"
2458 : "OBJC_CLASS_$_" + StringClass;
Fariborz Jahanian6f40e222011-05-17 22:21:16 +00002459 GV = getObjCRuntime().GetClassGlobal(str);
2460 // Make sure the result is of the correct type.
Chris Lattner2acc6e32011-07-18 04:24:23 +00002461 llvm::Type *PTy = llvm::PointerType::getUnqual(Ty);
Fariborz Jahanian428edb72013-04-16 15:25:39 +00002462 V = llvm::ConstantExpr::getBitCast(GV, PTy);
2463 ConstantStringClassRef = V;
Fariborz Jahanian6f40e222011-05-17 22:21:16 +00002464 } else {
Fariborz Jahanian25dba5d2011-05-17 22:46:11 +00002465 std::string str =
2466 StringClass.empty() ? "_NSConstantStringClassReference"
2467 : "_" + StringClass + "ClassReference";
Chris Lattner2acc6e32011-07-18 04:24:23 +00002468 llvm::Type *PTy = llvm::ArrayType::get(Ty, 0);
Fariborz Jahanian25dba5d2011-05-17 22:46:11 +00002469 GV = CreateRuntimeVariable(PTy, str);
Fariborz Jahanian6f40e222011-05-17 22:21:16 +00002470 // Decay array -> ptr
Fariborz Jahanian428edb72013-04-16 15:25:39 +00002471 V = llvm::ConstantExpr::getGetElementPtr(GV, Zeros);
2472 ConstantStringClassRef = V;
Fariborz Jahanian4c733072010-10-19 17:19:29 +00002473 }
Fariborz Jahanian2bb5dda2010-04-23 17:41:07 +00002474 }
Fariborz Jahanian428edb72013-04-16 15:25:39 +00002475 else
2476 V = ConstantStringClassRef;
Douglas Gregor45c4ea72011-08-09 15:54:21 +00002477
2478 if (!NSConstantStringType) {
2479 // Construct the type for a constant NSString.
2480 RecordDecl *D = CreateRecordDecl(Context, TTK_Struct,
2481 Context.getTranslationUnitDecl(),
2482 &Context.Idents.get("__builtin_NSString"));
2483 D->startDefinition();
2484
2485 QualType FieldTypes[3];
2486
2487 // const int *isa;
2488 FieldTypes[0] = Context.getPointerType(Context.IntTy.withConst());
2489 // const char *str;
2490 FieldTypes[1] = Context.getPointerType(Context.CharTy.withConst());
2491 // unsigned int length;
2492 FieldTypes[2] = Context.UnsignedIntTy;
2493
2494 // Create fields
2495 for (unsigned i = 0; i < 3; ++i) {
2496 FieldDecl *Field = FieldDecl::Create(Context, D,
2497 SourceLocation(),
2498 SourceLocation(), 0,
2499 FieldTypes[i], /*TInfo=*/0,
2500 /*BitWidth=*/0,
2501 /*Mutable=*/false,
Richard Smithca523302012-06-10 03:12:00 +00002502 ICIS_NoInit);
Douglas Gregor45c4ea72011-08-09 15:54:21 +00002503 Field->setAccess(AS_public);
2504 D->addDecl(Field);
2505 }
2506
2507 D->completeDefinition();
2508 QualType NSTy = Context.getTagDeclType(D);
2509 NSConstantStringType = cast<llvm::StructType>(getTypes().ConvertType(NSTy));
2510 }
Fariborz Jahanian2bb5dda2010-04-23 17:41:07 +00002511
Benjamin Kramer1d236ab2011-10-15 12:20:02 +00002512 llvm::Constant *Fields[3];
Fariborz Jahanian2bb5dda2010-04-23 17:41:07 +00002513
2514 // Class pointer.
Fariborz Jahanian428edb72013-04-16 15:25:39 +00002515 Fields[0] = cast<llvm::ConstantExpr>(V);
Fariborz Jahanian2bb5dda2010-04-23 17:41:07 +00002516
2517 // String pointer.
Chris Lattner94010692012-02-05 02:30:40 +00002518 llvm::Constant *C =
2519 llvm::ConstantDataArray::getString(VMContext, Entry.getKey());
Fariborz Jahanian2bb5dda2010-04-23 17:41:07 +00002520
2521 llvm::GlobalValue::LinkageTypes Linkage;
2522 bool isConstant;
Fariborz Jahaniancf8e1682011-05-13 18:13:10 +00002523 Linkage = llvm::GlobalValue::PrivateLinkage;
David Blaikie4e4d0842012-03-11 07:00:24 +00002524 isConstant = !LangOpts.WritableStrings;
Fariborz Jahanian2bb5dda2010-04-23 17:41:07 +00002525
2526 llvm::GlobalVariable *GV =
2527 new llvm::GlobalVariable(getModule(), C->getType(), isConstant, Linkage, C,
2528 ".str");
Rafael Espindola803d3072011-01-17 22:11:21 +00002529 GV->setUnnamedAddr(true);
Ulrich Weigand6b203512013-05-06 16:23:57 +00002530 // Don't enforce the target's minimum global alignment, since the only use
2531 // of the string is via this class initializer.
Fariborz Jahaniancf8e1682011-05-13 18:13:10 +00002532 CharUnits Align = getContext().getTypeAlignInChars(getContext().CharTy);
2533 GV->setAlignment(Align.getQuantity());
Jay Foada5c04342011-07-21 14:31:17 +00002534 Fields[1] = llvm::ConstantExpr::getGetElementPtr(GV, Zeros);
Fariborz Jahanian2bb5dda2010-04-23 17:41:07 +00002535
2536 // String length.
Chris Lattner2acc6e32011-07-18 04:24:23 +00002537 llvm::Type *Ty = getTypes().ConvertType(getContext().UnsignedIntTy);
Fariborz Jahanian2bb5dda2010-04-23 17:41:07 +00002538 Fields[2] = llvm::ConstantInt::get(Ty, StringLength);
2539
2540 // The struct.
Douglas Gregor45c4ea72011-08-09 15:54:21 +00002541 C = llvm::ConstantStruct::get(NSConstantStringType, Fields);
Fariborz Jahanian2bb5dda2010-04-23 17:41:07 +00002542 GV = new llvm::GlobalVariable(getModule(), C->getType(), true,
2543 llvm::GlobalVariable::PrivateLinkage, C,
2544 "_unnamed_nsstring_");
2545 // FIXME. Fix section.
Fariborz Jahanianec951e02010-04-23 22:33:39 +00002546 if (const char *Sect =
John McCall260611a2012-06-20 06:18:46 +00002547 LangOpts.ObjCRuntime.isNonFragile()
John McCall64aa4b32013-04-16 22:48:15 +00002548 ? getTarget().getNSStringNonFragileABISection()
2549 : getTarget().getNSStringSection())
Fariborz Jahanian2bb5dda2010-04-23 17:41:07 +00002550 GV->setSection(Sect);
2551 Entry.setValue(GV);
2552
2553 return GV;
Fariborz Jahanian33e982b2010-04-22 20:26:39 +00002554}
2555
Douglas Gregor0815b572011-08-09 17:23:49 +00002556QualType CodeGenModule::getObjCFastEnumerationStateType() {
2557 if (ObjCFastEnumerationStateType.isNull()) {
2558 RecordDecl *D = CreateRecordDecl(Context, TTK_Struct,
2559 Context.getTranslationUnitDecl(),
2560 &Context.Idents.get("__objcFastEnumerationState"));
2561 D->startDefinition();
2562
2563 QualType FieldTypes[] = {
2564 Context.UnsignedLongTy,
2565 Context.getPointerType(Context.getObjCIdType()),
2566 Context.getPointerType(Context.UnsignedLongTy),
2567 Context.getConstantArrayType(Context.UnsignedLongTy,
2568 llvm::APInt(32, 5), ArrayType::Normal, 0)
2569 };
2570
2571 for (size_t i = 0; i < 4; ++i) {
2572 FieldDecl *Field = FieldDecl::Create(Context,
2573 D,
2574 SourceLocation(),
2575 SourceLocation(), 0,
2576 FieldTypes[i], /*TInfo=*/0,
2577 /*BitWidth=*/0,
2578 /*Mutable=*/false,
Richard Smithca523302012-06-10 03:12:00 +00002579 ICIS_NoInit);
Douglas Gregor0815b572011-08-09 17:23:49 +00002580 Field->setAccess(AS_public);
2581 D->addDecl(Field);
2582 }
2583
2584 D->completeDefinition();
2585 ObjCFastEnumerationStateType = Context.getTagDeclType(D);
2586 }
2587
2588 return ObjCFastEnumerationStateType;
2589}
2590
Eli Friedman64f45a22011-11-01 02:23:42 +00002591llvm::Constant *
2592CodeGenModule::GetConstantArrayFromStringLiteral(const StringLiteral *E) {
2593 assert(!E->getType()->isPointerType() && "Strings are always arrays");
2594
2595 // Don't emit it as the address of the string, emit the string data itself
2596 // as an inline array.
Chris Lattner812234b2012-02-06 22:47:00 +00002597 if (E->getCharByteWidth() == 1) {
2598 SmallString<64> Str(E->getString());
2599
2600 // Resize the string to the right size, which is indicated by its type.
2601 const ConstantArrayType *CAT = Context.getAsConstantArrayType(E->getType());
2602 Str.resize(CAT->getSize().getZExtValue());
2603 return llvm::ConstantDataArray::getString(VMContext, Str, false);
2604 }
Chris Lattner94010692012-02-05 02:30:40 +00002605
2606 llvm::ArrayType *AType =
2607 cast<llvm::ArrayType>(getTypes().ConvertType(E->getType()));
2608 llvm::Type *ElemTy = AType->getElementType();
2609 unsigned NumElements = AType->getNumElements();
Chris Lattnerd79ed432012-02-06 22:52:04 +00002610
2611 // Wide strings have either 2-byte or 4-byte elements.
2612 if (ElemTy->getPrimitiveSizeInBits() == 16) {
2613 SmallVector<uint16_t, 32> Elements;
2614 Elements.reserve(NumElements);
2615
2616 for(unsigned i = 0, e = E->getLength(); i != e; ++i)
2617 Elements.push_back(E->getCodeUnit(i));
2618 Elements.resize(NumElements);
2619 return llvm::ConstantDataArray::get(VMContext, Elements);
Chris Lattner94010692012-02-05 02:30:40 +00002620 }
2621
Chris Lattnerd79ed432012-02-06 22:52:04 +00002622 assert(ElemTy->getPrimitiveSizeInBits() == 32);
2623 SmallVector<uint32_t, 32> Elements;
2624 Elements.reserve(NumElements);
2625
2626 for(unsigned i = 0, e = E->getLength(); i != e; ++i)
2627 Elements.push_back(E->getCodeUnit(i));
2628 Elements.resize(NumElements);
2629 return llvm::ConstantDataArray::get(VMContext, Elements);
Eli Friedman64f45a22011-11-01 02:23:42 +00002630}
2631
Daniel Dunbar61432932008-08-13 23:20:05 +00002632/// GetAddrOfConstantStringFromLiteral - Return a pointer to a
2633/// constant array for the given string literal.
2634llvm::Constant *
2635CodeGenModule::GetAddrOfConstantStringFromLiteral(const StringLiteral *S) {
Ulrich Weigand6b203512013-05-06 16:23:57 +00002636 CharUnits Align = getContext().getAlignOfGlobalVarInChars(S->getType());
Eli Friedman64f45a22011-11-01 02:23:42 +00002637 if (S->isAscii() || S->isUTF8()) {
Chris Lattner812234b2012-02-06 22:47:00 +00002638 SmallString<64> Str(S->getString());
2639
2640 // Resize the string to the right size, which is indicated by its type.
2641 const ConstantArrayType *CAT = Context.getAsConstantArrayType(S->getType());
2642 Str.resize(CAT->getSize().getZExtValue());
2643 return GetAddrOfConstantString(Str, /*GlobalName*/ 0, Align.getQuantity());
Eli Friedman7eb79c12009-11-16 05:55:46 +00002644 }
Eli Friedman64f45a22011-11-01 02:23:42 +00002645
Chris Lattner812234b2012-02-06 22:47:00 +00002646 // FIXME: the following does not memoize wide strings.
Eli Friedman64f45a22011-11-01 02:23:42 +00002647 llvm::Constant *C = GetConstantArrayFromStringLiteral(S);
2648 llvm::GlobalVariable *GV =
2649 new llvm::GlobalVariable(getModule(),C->getType(),
David Blaikie4e4d0842012-03-11 07:00:24 +00002650 !LangOpts.WritableStrings,
Eli Friedman64f45a22011-11-01 02:23:42 +00002651 llvm::GlobalValue::PrivateLinkage,
2652 C,".str");
Seth Cantrell7d6a7c02012-01-18 12:11:32 +00002653
Eli Friedman64f45a22011-11-01 02:23:42 +00002654 GV->setAlignment(Align.getQuantity());
2655 GV->setUnnamedAddr(true);
Eli Friedman64f45a22011-11-01 02:23:42 +00002656 return GV;
Daniel Dunbar61432932008-08-13 23:20:05 +00002657}
2658
Chris Lattnereaf2bb82009-02-24 22:18:39 +00002659/// GetAddrOfConstantStringFromObjCEncode - Return a pointer to a constant
2660/// array for the given ObjCEncodeExpr node.
2661llvm::Constant *
2662CodeGenModule::GetAddrOfConstantStringFromObjCEncode(const ObjCEncodeExpr *E) {
2663 std::string Str;
2664 getContext().getObjCEncodingForType(E->getEncodedType(), Str);
Eli Friedmana210f352009-03-07 20:17:55 +00002665
2666 return GetAddrOfConstantCString(Str);
Chris Lattnereaf2bb82009-02-24 22:18:39 +00002667}
2668
2669
Chris Lattnera7ad98f2008-02-11 00:02:17 +00002670/// GenerateWritableString -- Creates storage for a string literal.
John McCalla5e19c62011-08-04 01:03:22 +00002671static llvm::GlobalVariable *GenerateStringLiteral(StringRef str,
Chris Lattner45e8cbd2007-11-28 05:34:05 +00002672 bool constant,
Daniel Dunbar5fabf9d2008-10-17 21:56:50 +00002673 CodeGenModule &CGM,
John McCalla5e19c62011-08-04 01:03:22 +00002674 const char *GlobalName,
2675 unsigned Alignment) {
Daniel Dunbar61432932008-08-13 23:20:05 +00002676 // Create Constant for this string literal. Don't add a '\0'.
Owen Anderson0032b272009-08-13 21:57:51 +00002677 llvm::Constant *C =
Chris Lattner94010692012-02-05 02:30:40 +00002678 llvm::ConstantDataArray::getString(CGM.getLLVMContext(), str, false);
Mike Stump1eb44332009-09-09 15:08:12 +00002679
Chris Lattner45e8cbd2007-11-28 05:34:05 +00002680 // Create a global variable for this string
Rafael Espindola1257bc62011-01-10 22:34:03 +00002681 llvm::GlobalVariable *GV =
2682 new llvm::GlobalVariable(CGM.getModule(), C->getType(), constant,
2683 llvm::GlobalValue::PrivateLinkage,
2684 C, GlobalName);
John McCalla5e19c62011-08-04 01:03:22 +00002685 GV->setAlignment(Alignment);
Rafael Espindola1257bc62011-01-10 22:34:03 +00002686 GV->setUnnamedAddr(true);
2687 return GV;
Chris Lattner45e8cbd2007-11-28 05:34:05 +00002688}
2689
Daniel Dunbar61432932008-08-13 23:20:05 +00002690/// GetAddrOfConstantString - Returns a pointer to a character array
2691/// containing the literal. This contents are exactly that of the
2692/// given string, i.e. it will not be null terminated automatically;
2693/// see GetAddrOfConstantCString. Note that whether the result is
2694/// actually a pointer to an LLVM constant depends on
2695/// Feature.WriteableStrings.
2696///
2697/// The result has pointer to array type.
Chris Lattner5f9e2722011-07-23 10:55:15 +00002698llvm::Constant *CodeGenModule::GetAddrOfConstantString(StringRef Str,
John McCalla5e19c62011-08-04 01:03:22 +00002699 const char *GlobalName,
2700 unsigned Alignment) {
Daniel Dunbar8e5c2b82009-03-31 23:42:16 +00002701 // Get the default prefix if a name wasn't specified.
2702 if (!GlobalName)
Chris Lattner95b851e2009-07-16 05:03:48 +00002703 GlobalName = ".str";
Daniel Dunbar8e5c2b82009-03-31 23:42:16 +00002704
Ulrich Weigand6b203512013-05-06 16:23:57 +00002705 if (Alignment == 0)
2706 Alignment = getContext().getAlignOfGlobalVarInChars(getContext().CharTy)
2707 .getQuantity();
2708
Daniel Dunbar8e5c2b82009-03-31 23:42:16 +00002709 // Don't share any string literals if strings aren't constant.
David Blaikie4e4d0842012-03-11 07:00:24 +00002710 if (LangOpts.WritableStrings)
John McCalla5e19c62011-08-04 01:03:22 +00002711 return GenerateStringLiteral(Str, false, *this, GlobalName, Alignment);
Mike Stump1eb44332009-09-09 15:08:12 +00002712
John McCalla5e19c62011-08-04 01:03:22 +00002713 llvm::StringMapEntry<llvm::GlobalVariable *> &Entry =
Benjamin Kramer9de43422011-03-05 13:45:23 +00002714 ConstantStringMap.GetOrCreateValue(Str);
Chris Lattner45e8cbd2007-11-28 05:34:05 +00002715
John McCalla5e19c62011-08-04 01:03:22 +00002716 if (llvm::GlobalVariable *GV = Entry.getValue()) {
2717 if (Alignment > GV->getAlignment()) {
2718 GV->setAlignment(Alignment);
2719 }
2720 return GV;
2721 }
Chris Lattner45e8cbd2007-11-28 05:34:05 +00002722
2723 // Create a global variable for this.
Chris Lattner812234b2012-02-06 22:47:00 +00002724 llvm::GlobalVariable *GV = GenerateStringLiteral(Str, true, *this, GlobalName,
2725 Alignment);
John McCalla5e19c62011-08-04 01:03:22 +00002726 Entry.setValue(GV);
2727 return GV;
Chris Lattner45e8cbd2007-11-28 05:34:05 +00002728}
Daniel Dunbar61432932008-08-13 23:20:05 +00002729
2730/// GetAddrOfConstantCString - Returns a pointer to a character
Benjamin Kramer9de43422011-03-05 13:45:23 +00002731/// array containing the literal and a terminating '\0'
Daniel Dunbar61432932008-08-13 23:20:05 +00002732/// character. The result has pointer to array type.
Benjamin Kramer9de43422011-03-05 13:45:23 +00002733llvm::Constant *CodeGenModule::GetAddrOfConstantCString(const std::string &Str,
John McCalla5e19c62011-08-04 01:03:22 +00002734 const char *GlobalName,
2735 unsigned Alignment) {
Chris Lattner5f9e2722011-07-23 10:55:15 +00002736 StringRef StrWithNull(Str.c_str(), Str.size() + 1);
John McCalla5e19c62011-08-04 01:03:22 +00002737 return GetAddrOfConstantString(StrWithNull, GlobalName, Alignment);
Daniel Dunbar61432932008-08-13 23:20:05 +00002738}
Daniel Dunbar41071de2008-08-15 23:26:23 +00002739
Richard Smith211c8dd2013-06-05 00:46:14 +00002740llvm::Constant *CodeGenModule::GetAddrOfGlobalTemporary(
2741 const MaterializeTemporaryExpr *E, const Expr *Inner) {
2742 assert((E->getStorageDuration() == SD_Static ||
2743 E->getStorageDuration() == SD_Thread) && "not a global temporary");
2744 const VarDecl *VD = cast<VarDecl>(E->getExtendingDecl());
2745
2746 // If we're not materializing a subobject of the temporary, keep the
2747 // cv-qualifiers from the type of the MaterializeTemporaryExpr.
2748 if (Inner == E->GetTemporaryExpr())
2749 Inner = E;
2750
2751 llvm::Constant *&Slot = MaterializedGlobalTemporaryMap[E];
2752 if (Slot)
2753 return Slot;
2754
2755 // FIXME: If an externally-visible declaration extends multiple temporaries,
2756 // we need to give each temporary the same name in every translation unit (and
2757 // we also need to make the temporaries externally-visible).
2758 SmallString<256> Name;
2759 llvm::raw_svector_ostream Out(Name);
2760 getCXXABI().getMangleContext().mangleReferenceTemporary(VD, Out);
2761 Out.flush();
2762
2763 llvm::Constant *InitialValue = 0;
2764 APValue *Value = 0;
2765 if (E->getStorageDuration() == SD_Static) {
2766 // We might have a constant initializer for this temporary.
2767 Value = getContext().getMaterializedTemporaryValue(E, false);
2768 if (Value && Value->isUninit())
2769 Value = 0;
2770 }
2771
2772 bool Constant;
2773 if (Value) {
2774 // The temporary has a constant initializer, use it.
2775 InitialValue = EmitConstantValue(*Value, Inner->getType(), 0);
2776 Constant = isTypeConstant(Inner->getType(), /*ExcludeCtor*/Value);
2777 } else {
2778 // No constant initializer, the initialization will be provided when we
2779 // initialize the declaration which performed lifetime extension.
2780 InitialValue = EmitNullConstant(Inner->getType());
2781 Constant = false;
2782 }
2783
2784 // Create a global variable for this lifetime-extended temporary.
2785 llvm::GlobalVariable *GV =
2786 new llvm::GlobalVariable(getModule(), InitialValue->getType(), Constant,
2787 llvm::GlobalValue::PrivateLinkage, InitialValue,
2788 Name.c_str());
2789 GV->setAlignment(
2790 getContext().getTypeAlignInChars(Inner->getType()).getQuantity());
2791 if (VD->getTLSKind())
2792 setTLSMode(GV, *VD);
2793 Slot = GV;
2794 return GV;
2795}
2796
Daniel Dunbaraf05bb92008-08-26 08:29:31 +00002797/// EmitObjCPropertyImplementations - Emit information for synthesized
2798/// properties for an implementation.
Mike Stump1eb44332009-09-09 15:08:12 +00002799void CodeGenModule::EmitObjCPropertyImplementations(const
Daniel Dunbaraf05bb92008-08-26 08:29:31 +00002800 ObjCImplementationDecl *D) {
Mike Stump1eb44332009-09-09 15:08:12 +00002801 for (ObjCImplementationDecl::propimpl_iterator
Argyrios Kyrtzidis17945a02009-06-30 02:36:12 +00002802 i = D->propimpl_begin(), e = D->propimpl_end(); i != e; ++i) {
David Blaikie581deb32012-06-06 20:45:41 +00002803 ObjCPropertyImplDecl *PID = *i;
Mike Stump1eb44332009-09-09 15:08:12 +00002804
Daniel Dunbaraf05bb92008-08-26 08:29:31 +00002805 // Dynamic is just for type-checking.
2806 if (PID->getPropertyImplementation() == ObjCPropertyImplDecl::Synthesize) {
2807 ObjCPropertyDecl *PD = PID->getPropertyDecl();
2808
2809 // Determine which methods need to be implemented, some may have
Jordan Rose1e4691b2012-10-10 16:42:25 +00002810 // been overridden. Note that ::isPropertyAccessor is not the method
Daniel Dunbaraf05bb92008-08-26 08:29:31 +00002811 // we want, that just indicates if the decl came from a
2812 // property. What we want to know is if the method is defined in
2813 // this implementation.
Argyrios Kyrtzidis17945a02009-06-30 02:36:12 +00002814 if (!D->getInstanceMethod(PD->getGetterName()))
Fariborz Jahanianfef30b52008-12-09 20:23:04 +00002815 CodeGenFunction(*this).GenerateObjCGetter(
2816 const_cast<ObjCImplementationDecl *>(D), PID);
Daniel Dunbaraf05bb92008-08-26 08:29:31 +00002817 if (!PD->isReadOnly() &&
Argyrios Kyrtzidis17945a02009-06-30 02:36:12 +00002818 !D->getInstanceMethod(PD->getSetterName()))
Fariborz Jahanianfef30b52008-12-09 20:23:04 +00002819 CodeGenFunction(*this).GenerateObjCSetter(
2820 const_cast<ObjCImplementationDecl *>(D), PID);
Daniel Dunbaraf05bb92008-08-26 08:29:31 +00002821 }
2822 }
2823}
2824
John McCalle81ac692011-03-22 07:05:39 +00002825static bool needsDestructMethod(ObjCImplementationDecl *impl) {
Jordy Rosedb8264e2011-07-22 02:08:32 +00002826 const ObjCInterfaceDecl *iface = impl->getClassInterface();
2827 for (const ObjCIvarDecl *ivar = iface->all_declared_ivar_begin();
John McCalle81ac692011-03-22 07:05:39 +00002828 ivar; ivar = ivar->getNextIvar())
2829 if (ivar->getType().isDestructedType())
2830 return true;
2831
2832 return false;
2833}
2834
Fariborz Jahanian109dfc62010-04-28 21:28:56 +00002835/// EmitObjCIvarInitializations - Emit information for ivar initialization
2836/// for an implementation.
2837void CodeGenModule::EmitObjCIvarInitializations(ObjCImplementationDecl *D) {
John McCalle81ac692011-03-22 07:05:39 +00002838 // We might need a .cxx_destruct even if we don't have any ivar initializers.
2839 if (needsDestructMethod(D)) {
2840 IdentifierInfo *II = &getContext().Idents.get(".cxx_destruct");
2841 Selector cxxSelector = getContext().Selectors.getSelector(0, &II);
2842 ObjCMethodDecl *DTORMethod =
2843 ObjCMethodDecl::Create(getContext(), D->getLocation(), D->getLocation(),
Argyrios Kyrtzidis75cf3e82011-08-17 19:25:08 +00002844 cxxSelector, getContext().VoidTy, 0, D,
2845 /*isInstance=*/true, /*isVariadic=*/false,
Jordan Rose1e4691b2012-10-10 16:42:25 +00002846 /*isPropertyAccessor=*/true, /*isImplicitlyDeclared=*/true,
Argyrios Kyrtzidis75cf3e82011-08-17 19:25:08 +00002847 /*isDefined=*/false, ObjCMethodDecl::Required);
John McCalle81ac692011-03-22 07:05:39 +00002848 D->addInstanceMethod(DTORMethod);
2849 CodeGenFunction(*this).GenerateObjCCtorDtorMethod(D, DTORMethod, false);
John McCallb03527a2012-10-17 04:53:31 +00002850 D->setHasDestructors(true);
John McCalle81ac692011-03-22 07:05:39 +00002851 }
2852
2853 // If the implementation doesn't have any ivar initializers, we don't need
2854 // a .cxx_construct.
David Chisnall827bbcc2011-03-17 14:19:08 +00002855 if (D->getNumIvarInitializers() == 0)
Fariborz Jahanian109dfc62010-04-28 21:28:56 +00002856 return;
Fariborz Jahanian109dfc62010-04-28 21:28:56 +00002857
John McCalle81ac692011-03-22 07:05:39 +00002858 IdentifierInfo *II = &getContext().Idents.get(".cxx_construct");
2859 Selector cxxSelector = getContext().Selectors.getSelector(0, &II);
Fariborz Jahanian109dfc62010-04-28 21:28:56 +00002860 // The constructor returns 'self'.
2861 ObjCMethodDecl *CTORMethod = ObjCMethodDecl::Create(getContext(),
2862 D->getLocation(),
Argyrios Kyrtzidis11d77162011-10-03 06:36:36 +00002863 D->getLocation(),
Argyrios Kyrtzidis11d77162011-10-03 06:36:36 +00002864 cxxSelector,
Fariborz Jahanian109dfc62010-04-28 21:28:56 +00002865 getContext().getObjCIdType(), 0,
Argyrios Kyrtzidis75cf3e82011-08-17 19:25:08 +00002866 D, /*isInstance=*/true,
2867 /*isVariadic=*/false,
Jordan Rose1e4691b2012-10-10 16:42:25 +00002868 /*isPropertyAccessor=*/true,
Argyrios Kyrtzidis75cf3e82011-08-17 19:25:08 +00002869 /*isImplicitlyDeclared=*/true,
2870 /*isDefined=*/false,
Fariborz Jahanian109dfc62010-04-28 21:28:56 +00002871 ObjCMethodDecl::Required);
2872 D->addInstanceMethod(CTORMethod);
2873 CodeGenFunction(*this).GenerateObjCCtorDtorMethod(D, CTORMethod, true);
John McCallb03527a2012-10-17 04:53:31 +00002874 D->setHasNonZeroConstructors(true);
Fariborz Jahanian109dfc62010-04-28 21:28:56 +00002875}
2876
Anders Carlsson91e20dd2009-04-02 05:55:18 +00002877/// EmitNamespace - Emit all declarations in a namespace.
Anders Carlsson984e0682009-04-01 00:58:25 +00002878void CodeGenModule::EmitNamespace(const NamespaceDecl *ND) {
Argyrios Kyrtzidis17945a02009-06-30 02:36:12 +00002879 for (RecordDecl::decl_iterator I = ND->decls_begin(), E = ND->decls_end();
Anders Carlsson984e0682009-04-01 00:58:25 +00002880 I != E; ++I)
2881 EmitTopLevelDecl(*I);
2882}
2883
Anders Carlsson91e20dd2009-04-02 05:55:18 +00002884// EmitLinkageSpec - Emit all declarations in a linkage spec.
2885void CodeGenModule::EmitLinkageSpec(const LinkageSpecDecl *LSD) {
Eli Friedmanf976be82009-08-01 20:48:04 +00002886 if (LSD->getLanguage() != LinkageSpecDecl::lang_c &&
2887 LSD->getLanguage() != LinkageSpecDecl::lang_cxx) {
Anders Carlsson91e20dd2009-04-02 05:55:18 +00002888 ErrorUnsupported(LSD, "linkage spec");
2889 return;
2890 }
2891
Argyrios Kyrtzidis17945a02009-06-30 02:36:12 +00002892 for (RecordDecl::decl_iterator I = LSD->decls_begin(), E = LSD->decls_end();
Fariborz Jahanianc1868e52012-10-26 20:22:11 +00002893 I != E; ++I) {
Fariborz Jahanian107dae42012-10-26 22:20:25 +00002894 // Meta-data for ObjC class includes references to implemented methods.
2895 // Generate class's method definitions first.
Fariborz Jahanianc1868e52012-10-26 20:22:11 +00002896 if (ObjCImplDecl *OID = dyn_cast<ObjCImplDecl>(*I)) {
2897 for (ObjCContainerDecl::method_iterator M = OID->meth_begin(),
2898 MEnd = OID->meth_end();
2899 M != MEnd; ++M)
2900 EmitTopLevelDecl(*M);
2901 }
Anders Carlsson91e20dd2009-04-02 05:55:18 +00002902 EmitTopLevelDecl(*I);
Fariborz Jahanianc1868e52012-10-26 20:22:11 +00002903 }
Anders Carlsson91e20dd2009-04-02 05:55:18 +00002904}
2905
Daniel Dunbar41071de2008-08-15 23:26:23 +00002906/// EmitTopLevelDecl - Emit code for a single top level declaration.
2907void CodeGenModule::EmitTopLevelDecl(Decl *D) {
2908 // If an error has occurred, stop code generation, but continue
2909 // parsing and semantic analysis (to ensure all warnings and errors
2910 // are emitted).
2911 if (Diags.hasErrorOccurred())
2912 return;
2913
Douglas Gregor16e8be22009-06-29 17:30:29 +00002914 // Ignore dependent declarations.
2915 if (D->getDeclContext() && D->getDeclContext()->isDependentContext())
2916 return;
Mike Stump1eb44332009-09-09 15:08:12 +00002917
Daniel Dunbar41071de2008-08-15 23:26:23 +00002918 switch (D->getKind()) {
Anders Carlsson293361a2009-08-25 13:14:46 +00002919 case Decl::CXXConversion:
Anders Carlsson2b77ba82009-04-04 20:47:02 +00002920 case Decl::CXXMethod:
Daniel Dunbar41071de2008-08-15 23:26:23 +00002921 case Decl::Function:
Douglas Gregor16e8be22009-06-29 17:30:29 +00002922 // Skip function templates
Francois Pichet8387e2a2011-04-22 22:18:13 +00002923 if (cast<FunctionDecl>(D)->getDescribedFunctionTemplate() ||
2924 cast<FunctionDecl>(D)->isLateTemplateParsed())
Douglas Gregor16e8be22009-06-29 17:30:29 +00002925 return;
Mike Stump1eb44332009-09-09 15:08:12 +00002926
Anders Carlsson555b4bb2009-09-10 23:43:36 +00002927 EmitGlobal(cast<FunctionDecl>(D));
2928 break;
2929
Daniel Dunbar41071de2008-08-15 23:26:23 +00002930 case Decl::Var:
Anders Carlsson555b4bb2009-09-10 23:43:36 +00002931 EmitGlobal(cast<VarDecl>(D));
Daniel Dunbar41071de2008-08-15 23:26:23 +00002932 break;
2933
John McCall26fbc722011-04-12 01:01:22 +00002934 // Indirect fields from global anonymous structs and unions can be
2935 // ignored; only the actual variable requires IR gen support.
2936 case Decl::IndirectField:
2937 break;
2938
Anders Carlsson95d4e5d2009-04-15 15:55:24 +00002939 // C++ Decls
Daniel Dunbar41071de2008-08-15 23:26:23 +00002940 case Decl::Namespace:
Anders Carlsson984e0682009-04-01 00:58:25 +00002941 EmitNamespace(cast<NamespaceDecl>(D));
Daniel Dunbar41071de2008-08-15 23:26:23 +00002942 break;
Douglas Gregor9cfbe482009-06-20 00:51:54 +00002943 // No code generation needed.
John McCall9d0c6612009-11-17 09:33:40 +00002944 case Decl::UsingShadow:
Douglas Gregor9cfbe482009-06-20 00:51:54 +00002945 case Decl::Using:
Douglas Gregor127102b2009-06-29 20:59:39 +00002946 case Decl::ClassTemplate:
2947 case Decl::FunctionTemplate:
Richard Smith3e4c6c42011-05-05 21:57:07 +00002948 case Decl::TypeAliasTemplate:
Douglas Gregor6a576ab2011-06-05 05:04:23 +00002949 case Decl::Block:
Michael Han684aa732013-02-22 17:15:32 +00002950 case Decl::Empty:
Douglas Gregor9cfbe482009-06-20 00:51:54 +00002951 break;
David Blaikiefc46ebc2013-05-20 22:50:41 +00002952 case Decl::NamespaceAlias:
2953 if (CGDebugInfo *DI = getModuleDebugInfo())
2954 DI->EmitNamespaceAlias(cast<NamespaceAliasDecl>(*D));
2955 return;
David Blaikie1601a4a2013-04-26 05:41:06 +00002956 case Decl::UsingDirective: // using namespace X; [C++]
2957 if (CGDebugInfo *DI = getModuleDebugInfo())
2958 DI->EmitUsingDirective(cast<UsingDirectiveDecl>(*D));
2959 return;
Anders Carlsson95d4e5d2009-04-15 15:55:24 +00002960 case Decl::CXXConstructor:
Anders Carlsson1fe598c2009-11-24 05:16:24 +00002961 // Skip function templates
Francois Pichet8387e2a2011-04-22 22:18:13 +00002962 if (cast<FunctionDecl>(D)->getDescribedFunctionTemplate() ||
2963 cast<FunctionDecl>(D)->isLateTemplateParsed())
Anders Carlsson1fe598c2009-11-24 05:16:24 +00002964 return;
2965
Anders Carlsson95d4e5d2009-04-15 15:55:24 +00002966 EmitCXXConstructors(cast<CXXConstructorDecl>(D));
2967 break;
Anders Carlsson27ae5362009-04-17 01:58:57 +00002968 case Decl::CXXDestructor:
Francois Pichet8387e2a2011-04-22 22:18:13 +00002969 if (cast<FunctionDecl>(D)->isLateTemplateParsed())
2970 return;
Anders Carlsson27ae5362009-04-17 01:58:57 +00002971 EmitCXXDestructors(cast<CXXDestructorDecl>(D));
2972 break;
Anders Carlsson36674d22009-06-11 21:22:55 +00002973
2974 case Decl::StaticAssert:
2975 // Nothing to do.
2976 break;
2977
Anders Carlsson95d4e5d2009-04-15 15:55:24 +00002978 // Objective-C Decls
Mike Stump1eb44332009-09-09 15:08:12 +00002979
Fariborz Jahanian38e24c72009-03-18 22:33:24 +00002980 // Forward declarations, no (immediate) code generation.
Chris Lattner285d0db2009-04-01 02:36:43 +00002981 case Decl::ObjCInterface:
Eric Christopherffb0c3a2012-07-19 22:22:55 +00002982 case Decl::ObjCCategory:
Chris Lattner285d0db2009-04-01 02:36:43 +00002983 break;
2984
Douglas Gregorbd9482d2012-01-01 21:23:57 +00002985 case Decl::ObjCProtocol: {
2986 ObjCProtocolDecl *Proto = cast<ObjCProtocolDecl>(D);
2987 if (Proto->isThisDeclarationADefinition())
2988 ObjCRuntime->GenerateProtocol(Proto);
Daniel Dunbar41071de2008-08-15 23:26:23 +00002989 break;
Douglas Gregorbd9482d2012-01-01 21:23:57 +00002990 }
2991
Daniel Dunbar41071de2008-08-15 23:26:23 +00002992 case Decl::ObjCCategoryImpl:
Daniel Dunbaraf05bb92008-08-26 08:29:31 +00002993 // Categories have properties but don't support synthesize so we
2994 // can ignore them here.
Peter Collingbournee9265232011-07-27 20:29:46 +00002995 ObjCRuntime->GenerateCategory(cast<ObjCCategoryImplDecl>(D));
Daniel Dunbar41071de2008-08-15 23:26:23 +00002996 break;
2997
Daniel Dunbaraf05bb92008-08-26 08:29:31 +00002998 case Decl::ObjCImplementation: {
2999 ObjCImplementationDecl *OMD = cast<ObjCImplementationDecl>(D);
3000 EmitObjCPropertyImplementations(OMD);
Fariborz Jahanian109dfc62010-04-28 21:28:56 +00003001 EmitObjCIvarInitializations(OMD);
Peter Collingbournee9265232011-07-27 20:29:46 +00003002 ObjCRuntime->GenerateClass(OMD);
Eric Christopherbe6c6862012-04-11 05:56:05 +00003003 // Emit global variable debug information.
3004 if (CGDebugInfo *DI = getModuleDebugInfo())
Alexey Samsonov96a66392012-12-03 18:28:12 +00003005 if (getCodeGenOpts().getDebugInfo() >= CodeGenOptions::LimitedDebugInfo)
3006 DI->getOrCreateInterfaceType(getContext().getObjCInterfaceType(
3007 OMD->getClassInterface()), OMD->getLocation());
Daniel Dunbar41071de2008-08-15 23:26:23 +00003008 break;
Mike Stump1eb44332009-09-09 15:08:12 +00003009 }
Daniel Dunbar41071de2008-08-15 23:26:23 +00003010 case Decl::ObjCMethod: {
3011 ObjCMethodDecl *OMD = cast<ObjCMethodDecl>(D);
3012 // If this is not a prototype, emit the body.
Argyrios Kyrtzidis6fb0aee2009-06-30 02:35:26 +00003013 if (OMD->getBody())
Daniel Dunbar41071de2008-08-15 23:26:23 +00003014 CodeGenFunction(*this).GenerateObjCMethod(OMD);
3015 break;
3016 }
Mike Stump1eb44332009-09-09 15:08:12 +00003017 case Decl::ObjCCompatibleAlias:
David Chisnall29254f42012-01-31 18:59:20 +00003018 ObjCRuntime->RegisterAlias(cast<ObjCCompatibleAliasDecl>(D));
Daniel Dunbar41071de2008-08-15 23:26:23 +00003019 break;
3020
Anders Carlsson91e20dd2009-04-02 05:55:18 +00003021 case Decl::LinkageSpec:
3022 EmitLinkageSpec(cast<LinkageSpecDecl>(D));
Daniel Dunbar41071de2008-08-15 23:26:23 +00003023 break;
Daniel Dunbar41071de2008-08-15 23:26:23 +00003024
3025 case Decl::FileScopeAsm: {
3026 FileScopeAsmDecl *AD = cast<FileScopeAsmDecl>(D);
Chris Lattner5f9e2722011-07-23 10:55:15 +00003027 StringRef AsmString = AD->getAsmString()->getString();
Mike Stump1eb44332009-09-09 15:08:12 +00003028
Daniel Dunbar41071de2008-08-15 23:26:23 +00003029 const std::string &S = getModule().getModuleInlineAsm();
3030 if (S.empty())
3031 getModule().setModuleInlineAsm(AsmString);
Joerg Sonnenberger8ce9cca2012-08-10 10:57:52 +00003032 else if (S.end()[-1] == '\n')
Chris Lattner9f5bff02011-07-23 20:04:25 +00003033 getModule().setModuleInlineAsm(S + AsmString.str());
Daniel Dunbar41071de2008-08-15 23:26:23 +00003034 else
Benjamin Kramer8d042582009-12-11 13:33:18 +00003035 getModule().setModuleInlineAsm(S + '\n' + AsmString.str());
Daniel Dunbar41071de2008-08-15 23:26:23 +00003036 break;
3037 }
Mike Stump1eb44332009-09-09 15:08:12 +00003038
Douglas Gregorb6cbe512013-01-14 17:21:00 +00003039 case Decl::Import: {
3040 ImportDecl *Import = cast<ImportDecl>(D);
3041
3042 // Ignore import declarations that come from imported modules.
3043 if (clang::Module *Owner = Import->getOwningModule()) {
3044 if (getLangOpts().CurrentModule.empty() ||
3045 Owner->getTopLevelModule()->Name == getLangOpts().CurrentModule)
3046 break;
3047 }
3048
Douglas Gregor858afb32013-01-14 20:53:57 +00003049 ImportedModules.insert(Import->getImportedModule());
Douglas Gregorb6cbe512013-01-14 17:21:00 +00003050 break;
3051 }
3052
Mike Stump1eb44332009-09-09 15:08:12 +00003053 default:
Mike Stumpf5408fe2009-05-16 07:57:57 +00003054 // Make sure we handled everything we should, every other kind is a
3055 // non-top-level decl. FIXME: Would be nice to have an isTopLevelDeclKind
3056 // function. Need to recode Decl::Kind to do that easily.
Daniel Dunbar41071de2008-08-15 23:26:23 +00003057 assert(isa<TypeDecl>(D) && "Unsupported decl kind");
3058 }
3059}
John McCall744016d2010-07-06 23:57:41 +00003060
3061/// Turns the given pointer into a constant.
3062static llvm::Constant *GetPointerConstant(llvm::LLVMContext &Context,
3063 const void *Ptr) {
3064 uintptr_t PtrInt = reinterpret_cast<uintptr_t>(Ptr);
Chris Lattner2acc6e32011-07-18 04:24:23 +00003065 llvm::Type *i64 = llvm::Type::getInt64Ty(Context);
John McCall744016d2010-07-06 23:57:41 +00003066 return llvm::ConstantInt::get(i64, PtrInt);
3067}
3068
3069static void EmitGlobalDeclMetadata(CodeGenModule &CGM,
3070 llvm::NamedMDNode *&GlobalMetadata,
3071 GlobalDecl D,
3072 llvm::GlobalValue *Addr) {
3073 if (!GlobalMetadata)
3074 GlobalMetadata =
3075 CGM.getModule().getOrInsertNamedMetadata("clang.global.decl.ptrs");
3076
3077 // TODO: should we report variant information for ctors/dtors?
3078 llvm::Value *Ops[] = {
3079 Addr,
3080 GetPointerConstant(CGM.getLLVMContext(), D.getDecl())
3081 };
Jay Foad6f141652011-04-21 19:59:12 +00003082 GlobalMetadata->addOperand(llvm::MDNode::get(CGM.getLLVMContext(), Ops));
John McCall744016d2010-07-06 23:57:41 +00003083}
3084
Richard Smith00249372013-04-06 05:00:46 +00003085/// For each function which is declared within an extern "C" region and marked
3086/// as 'used', but has internal linkage, create an alias from the unmangled
3087/// name to the mangled name if possible. People expect to be able to refer
3088/// to such functions with an unmangled name from inline assembly within the
3089/// same translation unit.
3090void CodeGenModule::EmitStaticExternCAliases() {
Richard Smith84083b72013-04-13 01:28:18 +00003091 for (StaticExternCMap::iterator I = StaticExternCValues.begin(),
3092 E = StaticExternCValues.end();
3093 I != E; ++I) {
3094 IdentifierInfo *Name = I->first;
3095 llvm::GlobalValue *Val = I->second;
Richard Smith67972042013-04-06 07:07:44 +00003096 if (Val && !getModule().getNamedValue(Name->getName()))
3097 AddUsedGlobal(new llvm::GlobalAlias(Val->getType(), Val->getLinkage(),
3098 Name->getName(), Val, &getModule()));
3099 }
Richard Smith00249372013-04-06 05:00:46 +00003100}
3101
John McCall744016d2010-07-06 23:57:41 +00003102/// Emits metadata nodes associating all the global values in the
3103/// current module with the Decls they came from. This is useful for
3104/// projects using IR gen as a subroutine.
3105///
3106/// Since there's currently no way to associate an MDNode directly
3107/// with an llvm::GlobalValue, we create a global named metadata
3108/// with the name 'clang.global.decl.ptrs'.
3109void CodeGenModule::EmitDeclMetadata() {
3110 llvm::NamedMDNode *GlobalMetadata = 0;
3111
3112 // StaticLocalDeclMap
Chris Lattner5f9e2722011-07-23 10:55:15 +00003113 for (llvm::DenseMap<GlobalDecl,StringRef>::iterator
John McCall744016d2010-07-06 23:57:41 +00003114 I = MangledDeclNames.begin(), E = MangledDeclNames.end();
3115 I != E; ++I) {
3116 llvm::GlobalValue *Addr = getModule().getNamedValue(I->second);
3117 EmitGlobalDeclMetadata(*this, GlobalMetadata, I->first, Addr);
3118 }
3119}
3120
3121/// Emits metadata nodes for all the local variables in the current
3122/// function.
3123void CodeGenFunction::EmitDeclMetadata() {
3124 if (LocalDeclMap.empty()) return;
3125
3126 llvm::LLVMContext &Context = getLLVMContext();
3127
3128 // Find the unique metadata ID for this name.
3129 unsigned DeclPtrKind = Context.getMDKindID("clang.decl.ptr");
3130
3131 llvm::NamedMDNode *GlobalMetadata = 0;
3132
3133 for (llvm::DenseMap<const Decl*, llvm::Value*>::iterator
3134 I = LocalDeclMap.begin(), E = LocalDeclMap.end(); I != E; ++I) {
3135 const Decl *D = I->first;
3136 llvm::Value *Addr = I->second;
3137
3138 if (llvm::AllocaInst *Alloca = dyn_cast<llvm::AllocaInst>(Addr)) {
3139 llvm::Value *DAddr = GetPointerConstant(getLLVMContext(), D);
Jay Foad6f141652011-04-21 19:59:12 +00003140 Alloca->setMetadata(DeclPtrKind, llvm::MDNode::get(Context, DAddr));
John McCall744016d2010-07-06 23:57:41 +00003141 } else if (llvm::GlobalValue *GV = dyn_cast<llvm::GlobalValue>(Addr)) {
3142 GlobalDecl GD = GlobalDecl(cast<VarDecl>(D));
3143 EmitGlobalDeclMetadata(CGM, GlobalMetadata, GD, GV);
3144 }
3145 }
3146}
Daniel Dunbar673431a2010-07-16 00:00:15 +00003147
Nick Lewycky3dc05412011-05-05 00:08:20 +00003148void CodeGenModule::EmitCoverageFile() {
3149 if (!getCodeGenOpts().CoverageFile.empty()) {
Nick Lewycky5ea4f442011-05-04 20:46:58 +00003150 if (llvm::NamedMDNode *CUNode = TheModule.getNamedMetadata("llvm.dbg.cu")) {
3151 llvm::NamedMDNode *GCov = TheModule.getOrInsertNamedMetadata("llvm.gcov");
3152 llvm::LLVMContext &Ctx = TheModule.getContext();
Nick Lewycky3dc05412011-05-05 00:08:20 +00003153 llvm::MDString *CoverageFile =
3154 llvm::MDString::get(Ctx, getCodeGenOpts().CoverageFile);
Nick Lewycky5ea4f442011-05-04 20:46:58 +00003155 for (int i = 0, e = CUNode->getNumOperands(); i != e; ++i) {
3156 llvm::MDNode *CU = CUNode->getOperand(i);
Nick Lewycky3dc05412011-05-05 00:08:20 +00003157 llvm::Value *node[] = { CoverageFile, CU };
Nick Lewycky5ea4f442011-05-04 20:46:58 +00003158 llvm::MDNode *N = llvm::MDNode::get(Ctx, node);
3159 GCov->addOperand(N);
3160 }
3161 }
3162 }
3163}
Nico Weberc5f80462012-10-11 10:13:44 +00003164
3165llvm::Constant *CodeGenModule::EmitUuidofInitializer(StringRef Uuid,
3166 QualType GuidType) {
3167 // Sema has checked that all uuid strings are of the form
3168 // "12345678-1234-1234-1234-1234567890ab".
3169 assert(Uuid.size() == 36);
3170 const char *Uuidstr = Uuid.data();
3171 for (int i = 0; i < 36; ++i) {
3172 if (i == 8 || i == 13 || i == 18 || i == 23) assert(Uuidstr[i] == '-');
Jordan Rose3f6f51e2013-02-08 22:30:41 +00003173 else assert(isHexDigit(Uuidstr[i]));
Nico Weberc5f80462012-10-11 10:13:44 +00003174 }
3175
3176 llvm::APInt Field0(32, StringRef(Uuidstr , 8), 16);
3177 llvm::APInt Field1(16, StringRef(Uuidstr + 9, 4), 16);
3178 llvm::APInt Field2(16, StringRef(Uuidstr + 14, 4), 16);
Nico Weber193646f2012-10-17 00:34:34 +00003179 static const int Field3ValueOffsets[] = { 19, 21, 24, 26, 28, 30, 32, 34 };
Nico Weberc5f80462012-10-11 10:13:44 +00003180
3181 APValue InitStruct(APValue::UninitStruct(), /*NumBases=*/0, /*NumFields=*/4);
3182 InitStruct.getStructField(0) = APValue(llvm::APSInt(Field0));
3183 InitStruct.getStructField(1) = APValue(llvm::APSInt(Field1));
3184 InitStruct.getStructField(2) = APValue(llvm::APSInt(Field2));
3185 APValue& Arr = InitStruct.getStructField(3);
3186 Arr = APValue(APValue::UninitArray(), 8, 8);
3187 for (int t = 0; t < 8; ++t)
Nico Weber43085812012-10-13 21:56:05 +00003188 Arr.getArrayInitializedElt(t) = APValue(llvm::APSInt(
3189 llvm::APInt(8, StringRef(Uuidstr + Field3ValueOffsets[t], 2), 16)));
Nico Weberc5f80462012-10-11 10:13:44 +00003190
3191 return EmitConstantValue(InitStruct, GuidType);
3192}