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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"
Chris Lattnerbd360642009-03-26 05:00:52 +000015#include "CGDebugInfo.h"
Reid Spencer5f016e22007-07-11 17:01:13 +000016#include "CodeGenFunction.h"
Daniel Dunbar0dbe2272008-09-08 21:33:45 +000017#include "CGCall.h"
Daniel Dunbaraf2f62c2008-08-13 00:59:25 +000018#include "CGObjCRuntime.h"
Douglas Gregor5f2bfd42009-02-13 00:10:09 +000019#include "Mangle.h"
Chandler Carruth2811ccf2009-11-12 17:24:48 +000020#include "clang/CodeGen/CodeGenOptions.h"
Reid Spencer5f016e22007-07-11 17:01:13 +000021#include "clang/AST/ASTContext.h"
Daniel Dunbarc4a1dea2008-08-11 05:35:13 +000022#include "clang/AST/DeclObjC.h"
Chris Lattner21ef7ae2008-11-04 16:51:42 +000023#include "clang/AST/DeclCXX.h"
Anders Carlsson1a5e0d72009-11-30 23:41:22 +000024#include "clang/AST/RecordLayout.h"
Chris Lattner1b63e4f2009-06-14 01:54:56 +000025#include "clang/Basic/Builtins.h"
Chris Lattner2c8569d2007-12-02 07:19:18 +000026#include "clang/Basic/Diagnostic.h"
Nate Begeman8bd4afe2008-04-19 04:17:09 +000027#include "clang/Basic/SourceManager.h"
Reid Spencer5f016e22007-07-11 17:01:13 +000028#include "clang/Basic/TargetInfo.h"
Steve Naroffe9b7d8a2009-04-01 15:50:34 +000029#include "clang/Basic/ConvertUTF.h"
Nate Begemanec9426c2008-03-09 03:09:36 +000030#include "llvm/CallingConv.h"
Chris Lattnerbef20ac2007-08-31 04:31:45 +000031#include "llvm/Module.h"
Reid Spencer5f016e22007-07-11 17:01:13 +000032#include "llvm/Intrinsics.h"
Chris Lattnerd5b89022009-12-28 21:44:41 +000033#include "llvm/LLVMContext.h"
Anton Korobeynikov20ff3102008-06-01 14:13:53 +000034#include "llvm/Target/TargetData.h"
Chris Lattner78f7ece2009-11-07 09:22:46 +000035#include "llvm/Support/ErrorHandling.h"
Reid Spencer5f016e22007-07-11 17:01:13 +000036using namespace clang;
37using namespace CodeGen;
38
39
Chandler Carruth2811ccf2009-11-12 17:24:48 +000040CodeGenModule::CodeGenModule(ASTContext &C, const CodeGenOptions &CGO,
Chris Lattnerfb97b032007-12-02 01:40:18 +000041 llvm::Module &M, const llvm::TargetData &TD,
Chris Lattnerbd360642009-03-26 05:00:52 +000042 Diagnostic &diags)
43 : BlockModule(C, M, TD, Types, *this), Context(C),
Chandler Carruth2811ccf2009-11-12 17:24:48 +000044 Features(C.getLangOptions()), CodeGenOpts(CGO), TheModule(M),
Anders Carlssondbd920c2009-10-11 22:13:54 +000045 TheTargetData(TD), Diags(diags), Types(C, M, TD), MangleCtx(C),
46 VtableInfo(*this), Runtime(0),
Owen Andersona1cf15f2009-07-14 23:10:40 +000047 MemCpyFn(0), MemMoveFn(0), MemSetFn(0), CFConstantStringClassRef(0),
48 VMContext(M.getContext()) {
Daniel Dunbar208ff5e2008-08-11 18:12:00 +000049
Chris Lattner3c8f1532009-03-21 07:12:05 +000050 if (!Features.ObjC1)
51 Runtime = 0;
52 else if (!Features.NeXTRuntime)
53 Runtime = CreateGNUObjCRuntime(*this);
54 else if (Features.ObjCNonFragileABI)
55 Runtime = CreateMacNonFragileABIObjCRuntime(*this);
56 else
57 Runtime = CreateMacObjCRuntime(*this);
Sanjiv Guptae8b9f5b2008-05-08 08:54:20 +000058
59 // If debug info generation is enabled, create the CGDebugInfo object.
Anders Carlsson20f12a22009-12-06 18:00:51 +000060 DebugInfo = CodeGenOpts.DebugInfo ? new CGDebugInfo(*this) : 0;
Chris Lattner2b94fe32008-03-01 08:45:05 +000061}
62
63CodeGenModule::~CodeGenModule() {
Ted Kremenek815c78f2008-08-05 18:50:11 +000064 delete Runtime;
65 delete DebugInfo;
66}
67
68void CodeGenModule::Release() {
Anders Carlsson89ed31d2009-08-08 23:24:23 +000069 // We need to call this first because it can add deferred declarations.
70 EmitCXXGlobalInitFunc();
71
Chris Lattner82227ff2009-03-22 21:21:57 +000072 EmitDeferred();
Daniel Dunbar208ff5e2008-08-11 18:12:00 +000073 if (Runtime)
74 if (llvm::Function *ObjCInitFunction = Runtime->ModuleInitFunction())
75 AddGlobalCtor(ObjCInitFunction);
Daniel Dunbar6bfed7e2008-08-01 00:01:51 +000076 EmitCtorList(GlobalCtors, "llvm.global_ctors");
77 EmitCtorList(GlobalDtors, "llvm.global_dtors");
Nate Begeman532485c2008-04-18 23:43:57 +000078 EmitAnnotations();
Daniel Dunbar02698712009-02-13 20:29:50 +000079 EmitLLVMUsed();
Daniel Dunbarf1968f22008-10-01 00:49:24 +000080}
81
Daniel Dunbar488e9932008-08-16 00:56:44 +000082/// ErrorUnsupported - Print out an error that codegen doesn't support the
Chris Lattner2c8569d2007-12-02 07:19:18 +000083/// specified stmt yet.
Daniel Dunbar90df4b62008-09-04 03:43:08 +000084void CodeGenModule::ErrorUnsupported(const Stmt *S, const char *Type,
85 bool OmitOnError) {
86 if (OmitOnError && getDiags().hasErrorOccurred())
87 return;
Mike Stump1eb44332009-09-09 15:08:12 +000088 unsigned DiagID = getDiags().getCustomDiagID(Diagnostic::Error,
Daniel Dunbar56b80012009-02-06 19:18:03 +000089 "cannot compile this %0 yet");
Chris Lattner2c8569d2007-12-02 07:19:18 +000090 std::string Msg = Type;
Chris Lattner0a14eee2008-11-18 07:04:44 +000091 getDiags().Report(Context.getFullLoc(S->getLocStart()), DiagID)
92 << Msg << S->getSourceRange();
Chris Lattner2c8569d2007-12-02 07:19:18 +000093}
Chris Lattner58c3f9e2007-12-02 06:27:33 +000094
Daniel Dunbar488e9932008-08-16 00:56:44 +000095/// ErrorUnsupported - Print out an error that codegen doesn't support the
Chris Lattnerc6fdc342008-01-12 07:05:38 +000096/// specified decl yet.
Daniel Dunbar90df4b62008-09-04 03:43:08 +000097void CodeGenModule::ErrorUnsupported(const Decl *D, const char *Type,
98 bool OmitOnError) {
99 if (OmitOnError && getDiags().hasErrorOccurred())
100 return;
Mike Stump1eb44332009-09-09 15:08:12 +0000101 unsigned DiagID = getDiags().getCustomDiagID(Diagnostic::Error,
Daniel Dunbar56b80012009-02-06 19:18:03 +0000102 "cannot compile this %0 yet");
Chris Lattnerc6fdc342008-01-12 07:05:38 +0000103 std::string Msg = Type;
Chris Lattner0a14eee2008-11-18 07:04:44 +0000104 getDiags().Report(Context.getFullLoc(D->getLocation()), DiagID) << Msg;
Chris Lattnerc6fdc342008-01-12 07:05:38 +0000105}
106
Mike Stump1eb44332009-09-09 15:08:12 +0000107LangOptions::VisibilityMode
Daniel Dunbar04d40782009-04-14 06:00:08 +0000108CodeGenModule::getDeclVisibilityMode(const Decl *D) const {
109 if (const VarDecl *VD = dyn_cast<VarDecl>(D))
110 if (VD->getStorageClass() == VarDecl::PrivateExtern)
111 return LangOptions::Hidden;
112
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +0000113 if (const VisibilityAttr *attr = D->getAttr<VisibilityAttr>()) {
Daniel Dunbar04d40782009-04-14 06:00:08 +0000114 switch (attr->getVisibility()) {
115 default: assert(0 && "Unknown visibility!");
Mike Stump1eb44332009-09-09 15:08:12 +0000116 case VisibilityAttr::DefaultVisibility:
Daniel Dunbar04d40782009-04-14 06:00:08 +0000117 return LangOptions::Default;
118 case VisibilityAttr::HiddenVisibility:
119 return LangOptions::Hidden;
120 case VisibilityAttr::ProtectedVisibility:
121 return LangOptions::Protected;
122 }
123 }
124
125 return getLangOptions().getVisibilityMode();
126}
127
Mike Stump1eb44332009-09-09 15:08:12 +0000128void CodeGenModule::setGlobalVisibility(llvm::GlobalValue *GV,
Daniel Dunbar04d40782009-04-14 06:00:08 +0000129 const Decl *D) const {
130 // Internal definitions always have default visibility.
Chris Lattnerdf102fc2009-04-14 05:27:13 +0000131 if (GV->hasLocalLinkage()) {
Daniel Dunbar7e714cd2009-04-10 20:26:50 +0000132 GV->setVisibility(llvm::GlobalValue::DefaultVisibility);
Daniel Dunbar6ab187a2009-04-07 05:48:37 +0000133 return;
Daniel Dunbar7e714cd2009-04-10 20:26:50 +0000134 }
Daniel Dunbar6ab187a2009-04-07 05:48:37 +0000135
Daniel Dunbar04d40782009-04-14 06:00:08 +0000136 switch (getDeclVisibilityMode(D)) {
Dan Gohman4f8d1232008-05-22 00:50:06 +0000137 default: assert(0 && "Unknown visibility!");
Daniel Dunbar04d40782009-04-14 06:00:08 +0000138 case LangOptions::Default:
139 return GV->setVisibility(llvm::GlobalValue::DefaultVisibility);
140 case LangOptions::Hidden:
141 return GV->setVisibility(llvm::GlobalValue::HiddenVisibility);
142 case LangOptions::Protected:
143 return GV->setVisibility(llvm::GlobalValue::ProtectedVisibility);
Dan Gohman4f8d1232008-05-22 00:50:06 +0000144 }
145}
146
Anders Carlsson2a131fb2009-05-05 04:44:02 +0000147const char *CodeGenModule::getMangledName(const GlobalDecl &GD) {
Anders Carlsson4a6835e2009-09-10 23:38:47 +0000148 const NamedDecl *ND = cast<NamedDecl>(GD.getDecl());
Mike Stump1eb44332009-09-09 15:08:12 +0000149
Anders Carlsson2a131fb2009-05-05 04:44:02 +0000150 if (const CXXConstructorDecl *D = dyn_cast<CXXConstructorDecl>(ND))
151 return getMangledCXXCtorName(D, GD.getCtorType());
152 if (const CXXDestructorDecl *D = dyn_cast<CXXDestructorDecl>(ND))
153 return getMangledCXXDtorName(D, GD.getDtorType());
Mike Stump1eb44332009-09-09 15:08:12 +0000154
Anders Carlsson2a131fb2009-05-05 04:44:02 +0000155 return getMangledName(ND);
156}
157
Douglas Gregor5f2bfd42009-02-13 00:10:09 +0000158/// \brief Retrieves the mangled name for the given declaration.
159///
160/// If the given declaration requires a mangled name, returns an
Chris Lattnerc50689b2009-03-21 06:31:09 +0000161/// const char* containing the mangled name. Otherwise, returns
162/// the unmangled name.
Douglas Gregor5f2bfd42009-02-13 00:10:09 +0000163///
Douglas Gregor6ec36682009-02-18 23:53:56 +0000164const char *CodeGenModule::getMangledName(const NamedDecl *ND) {
Daniel Dunbarf981bf82009-11-21 09:14:52 +0000165 if (!getMangleContext().shouldMangleDeclName(ND)) {
Chris Lattnerc50689b2009-03-21 06:31:09 +0000166 assert(ND->getIdentifier() && "Attempt to mangle unnamed decl.");
Chris Lattner3c8f1532009-03-21 07:12:05 +0000167 return ND->getNameAsCString();
Chris Lattnerc50689b2009-03-21 06:31:09 +0000168 }
Mike Stump1eb44332009-09-09 15:08:12 +0000169
Douglas Gregor6ec36682009-02-18 23:53:56 +0000170 llvm::SmallString<256> Name;
Daniel Dunbarf981bf82009-11-21 09:14:52 +0000171 getMangleContext().mangleName(ND, Name);
Douglas Gregor6ec36682009-02-18 23:53:56 +0000172 Name += '\0';
Anders Carlsson95d4e5d2009-04-15 15:55:24 +0000173 return UniqueMangledName(Name.begin(), Name.end());
174}
175
176const char *CodeGenModule::UniqueMangledName(const char *NameStart,
177 const char *NameEnd) {
178 assert(*(NameEnd - 1) == '\0' && "Mangled name must be null terminated!");
Mike Stump1eb44332009-09-09 15:08:12 +0000179
Anders Carlsson95d4e5d2009-04-15 15:55:24 +0000180 return MangledNames.GetOrCreateValue(NameStart, NameEnd).getKeyData();
Douglas Gregor5f2bfd42009-02-13 00:10:09 +0000181}
182
Chris Lattner6d397602008-03-14 17:18:18 +0000183/// AddGlobalCtor - Add a function to the list that will be called before
184/// main() runs.
Daniel Dunbar6bfed7e2008-08-01 00:01:51 +0000185void CodeGenModule::AddGlobalCtor(llvm::Function * Ctor, int Priority) {
Daniel Dunbar49988882009-01-13 02:25:00 +0000186 // FIXME: Type coercion of void()* types.
Daniel Dunbar6bfed7e2008-08-01 00:01:51 +0000187 GlobalCtors.push_back(std::make_pair(Ctor, Priority));
Chris Lattner6d397602008-03-14 17:18:18 +0000188}
189
Daniel Dunbar6bfed7e2008-08-01 00:01:51 +0000190/// AddGlobalDtor - Add a function to the list that will be called
191/// when the module is unloaded.
192void CodeGenModule::AddGlobalDtor(llvm::Function * Dtor, int Priority) {
Daniel Dunbar49988882009-01-13 02:25:00 +0000193 // FIXME: Type coercion of void()* types.
Daniel Dunbar6bfed7e2008-08-01 00:01:51 +0000194 GlobalDtors.push_back(std::make_pair(Dtor, Priority));
195}
196
197void CodeGenModule::EmitCtorList(const CtorList &Fns, const char *GlobalName) {
198 // Ctor function type is void()*.
199 llvm::FunctionType* CtorFTy =
Mike Stump1eb44332009-09-09 15:08:12 +0000200 llvm::FunctionType::get(llvm::Type::getVoidTy(VMContext),
Daniel Dunbar6bfed7e2008-08-01 00:01:51 +0000201 std::vector<const llvm::Type*>(),
202 false);
Owen Anderson96e0fc72009-07-29 22:16:19 +0000203 llvm::Type *CtorPFTy = llvm::PointerType::getUnqual(CtorFTy);
Daniel Dunbar6bfed7e2008-08-01 00:01:51 +0000204
205 // Get the type of a ctor entry, { i32, void ()* }.
Mike Stump1eb44332009-09-09 15:08:12 +0000206 llvm::StructType* CtorStructTy =
207 llvm::StructType::get(VMContext, llvm::Type::getInt32Ty(VMContext),
Owen Anderson96e0fc72009-07-29 22:16:19 +0000208 llvm::PointerType::getUnqual(CtorFTy), NULL);
Chris Lattner6d397602008-03-14 17:18:18 +0000209
Daniel Dunbar6bfed7e2008-08-01 00:01:51 +0000210 // Construct the constructor and destructor arrays.
211 std::vector<llvm::Constant*> Ctors;
212 for (CtorList::const_iterator I = Fns.begin(), E = Fns.end(); I != E; ++I) {
213 std::vector<llvm::Constant*> S;
Mike Stump1eb44332009-09-09 15:08:12 +0000214 S.push_back(llvm::ConstantInt::get(llvm::Type::getInt32Ty(VMContext),
Owen Anderson0032b272009-08-13 21:57:51 +0000215 I->second, false));
Owen Anderson3c4972d2009-07-29 18:54:39 +0000216 S.push_back(llvm::ConstantExpr::getBitCast(I->first, CtorPFTy));
Owen Anderson08e25242009-07-27 22:29:56 +0000217 Ctors.push_back(llvm::ConstantStruct::get(CtorStructTy, S));
Chris Lattner6d397602008-03-14 17:18:18 +0000218 }
Daniel Dunbar6bfed7e2008-08-01 00:01:51 +0000219
220 if (!Ctors.empty()) {
Owen Anderson96e0fc72009-07-29 22:16:19 +0000221 llvm::ArrayType *AT = llvm::ArrayType::get(CtorStructTy, Ctors.size());
Owen Anderson1c431b32009-07-08 19:05:04 +0000222 new llvm::GlobalVariable(TheModule, AT, false,
Daniel Dunbar6bfed7e2008-08-01 00:01:51 +0000223 llvm::GlobalValue::AppendingLinkage,
Owen Anderson7db6d832009-07-28 18:33:04 +0000224 llvm::ConstantArray::get(AT, Ctors),
Owen Anderson1c431b32009-07-08 19:05:04 +0000225 GlobalName);
Daniel Dunbar6bfed7e2008-08-01 00:01:51 +0000226 }
Chris Lattner6d397602008-03-14 17:18:18 +0000227}
228
Nate Begeman532485c2008-04-18 23:43:57 +0000229void CodeGenModule::EmitAnnotations() {
230 if (Annotations.empty())
231 return;
232
233 // Create a new global variable for the ConstantStruct in the Module.
234 llvm::Constant *Array =
Owen Anderson96e0fc72009-07-29 22:16:19 +0000235 llvm::ConstantArray::get(llvm::ArrayType::get(Annotations[0]->getType(),
Nate Begeman532485c2008-04-18 23:43:57 +0000236 Annotations.size()),
237 Annotations);
Mike Stump1eb44332009-09-09 15:08:12 +0000238 llvm::GlobalValue *gv =
239 new llvm::GlobalVariable(TheModule, Array->getType(), false,
240 llvm::GlobalValue::AppendingLinkage, Array,
Owen Anderson1c431b32009-07-08 19:05:04 +0000241 "llvm.global.annotations");
Nate Begeman532485c2008-04-18 23:43:57 +0000242 gv->setSection("llvm.metadata");
243}
244
Chris Lattner86daeee2009-04-14 16:44:36 +0000245static CodeGenModule::GVALinkage
Mike Stump1eb44332009-09-09 15:08:12 +0000246GetLinkageForFunction(ASTContext &Context, const FunctionDecl *FD,
Douglas Gregor68584ed2009-06-18 16:11:24 +0000247 const LangOptions &Features) {
John McCall9aeed322009-10-01 00:25:31 +0000248 // Everything located semantically within an anonymous namespace is
249 // always internal.
250 if (FD->isInAnonymousNamespace())
251 return CodeGenModule::GVA_Internal;
252
Douglas Gregor7d9c3c92009-10-27 23:26:40 +0000253 // "static" functions get internal linkage.
254 if (FD->getStorageClass() == FunctionDecl::Static && !isa<CXXMethodDecl>(FD))
255 return CodeGenModule::GVA_Internal;
256
Douglas Gregor1fd2dd12009-06-29 22:39:32 +0000257 // The kind of external linkage this function will have, if it is not
258 // inline or static.
259 CodeGenModule::GVALinkage External = CodeGenModule::GVA_StrongExternal;
Anders Carlsson548e60e2009-12-10 22:25:34 +0000260 if (Context.getLangOptions().CPlusPlus) {
261 TemplateSpecializationKind TSK = FD->getTemplateSpecializationKind();
262
263 if (TSK == TSK_ExplicitInstantiationDefinition) {
264 // If a function has been explicitly instantiated, then it should
265 // always have strong external linkage.
266 return CodeGenModule::GVA_StrongExternal;
267 }
268
269 if (TSK == TSK_ImplicitInstantiation)
270 External = CodeGenModule::GVA_TemplateInstantiation;
271 }
Mike Stump1eb44332009-09-09 15:08:12 +0000272
Douglas Gregor7ced9c82009-10-27 21:11:48 +0000273 if (!FD->isInlined())
Douglas Gregor1fd2dd12009-06-29 22:39:32 +0000274 return External;
Mike Stump1eb44332009-09-09 15:08:12 +0000275
Douglas Gregor1fc09a92009-09-13 07:46:26 +0000276 if (!Features.CPlusPlus || FD->hasAttr<GNUInlineAttr>()) {
277 // GNU or C99 inline semantics. Determine whether this symbol should be
278 // externally visible.
279 if (FD->isInlineDefinitionExternallyVisible())
280 return External;
281
282 // C99 inline semantics, where the symbol is not externally visible.
283 return CodeGenModule::GVA_C99Inline;
Chris Lattnerd55a71d2009-04-22 00:03:30 +0000284 }
Chris Lattnercbb8fc12009-04-14 20:25:53 +0000285
Douglas Gregor7d9c3c92009-10-27 23:26:40 +0000286 // C++0x [temp.explicit]p9:
287 // [ Note: The intent is that an inline function that is the subject of
288 // an explicit instantiation declaration will still be implicitly
289 // instantiated when used so that the body can be considered for
290 // inlining, but that no out-of-line copy of the inline function would be
291 // generated in the translation unit. -- end note ]
292 if (FD->getTemplateSpecializationKind()
293 == TSK_ExplicitInstantiationDeclaration)
294 return CodeGenModule::GVA_C99Inline;
295
Douglas Gregor1fc09a92009-09-13 07:46:26 +0000296 return CodeGenModule::GVA_CXXInline;
Daniel Dunbar7c65e992009-04-14 08:05:55 +0000297}
298
299/// SetFunctionDefinitionAttributes - Set attributes for a global.
Daniel Dunbarb97b6922009-04-14 06:19:49 +0000300///
Mike Stumpf5408fe2009-05-16 07:57:57 +0000301/// FIXME: This is currently only done for aliases and functions, but not for
302/// variables (these details are set in EmitGlobalVarDefinition for variables).
Daniel Dunbar7c65e992009-04-14 08:05:55 +0000303void CodeGenModule::SetFunctionDefinitionAttributes(const FunctionDecl *D,
304 llvm::GlobalValue *GV) {
Douglas Gregor68584ed2009-06-18 16:11:24 +0000305 GVALinkage Linkage = GetLinkageForFunction(getContext(), D, Features);
Daniel Dunbar7c65e992009-04-14 08:05:55 +0000306
Daniel Dunbar55d6f502009-04-14 07:19:20 +0000307 if (Linkage == GVA_Internal) {
Chris Lattner9f942792009-04-14 05:33:52 +0000308 GV->setLinkage(llvm::Function::InternalLinkage);
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +0000309 } else if (D->hasAttr<DLLExportAttr>()) {
Daniel Dunbar7c65e992009-04-14 08:05:55 +0000310 GV->setLinkage(llvm::Function::DLLExportLinkage);
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +0000311 } else if (D->hasAttr<WeakAttr>()) {
Chris Lattner44b0bc02009-04-14 06:04:17 +0000312 GV->setLinkage(llvm::Function::WeakAnyLinkage);
Chris Lattnercbb8fc12009-04-14 20:25:53 +0000313 } else if (Linkage == GVA_C99Inline) {
314 // In C99 mode, 'inline' functions are guaranteed to have a strong
315 // definition somewhere else, so we can use available_externally linkage.
Chris Lattnerd9d049a2009-04-14 06:27:57 +0000316 GV->setLinkage(llvm::Function::AvailableExternallyLinkage);
Douglas Gregor1fd2dd12009-06-29 22:39:32 +0000317 } else if (Linkage == GVA_CXXInline || Linkage == GVA_TemplateInstantiation) {
Chris Lattner86daeee2009-04-14 16:44:36 +0000318 // In C++, the compiler has to emit a definition in every translation unit
319 // that references the function. We should use linkonce_odr because
320 // a) if all references in this translation unit are optimized away, we
321 // don't need to codegen it. b) if the function persists, it needs to be
322 // merged with other definitions. c) C++ has the ODR, so we know the
323 // definition is dependable.
324 GV->setLinkage(llvm::Function::LinkOnceODRLinkage);
Daniel Dunbar7c65e992009-04-14 08:05:55 +0000325 } else {
Chris Lattnercbb8fc12009-04-14 20:25:53 +0000326 assert(Linkage == GVA_StrongExternal);
327 // Otherwise, we have strong external linkage.
Daniel Dunbar7c65e992009-04-14 08:05:55 +0000328 GV->setLinkage(llvm::Function::ExternalLinkage);
Daniel Dunbar0dbe2272008-09-08 21:33:45 +0000329 }
Nuno Lopesd4cbda62008-06-08 15:45:52 +0000330
Daniel Dunbar7c65e992009-04-14 08:05:55 +0000331 SetCommonAttributes(D, GV);
Nuno Lopesd4cbda62008-06-08 15:45:52 +0000332}
333
Daniel Dunbar7dbd8192009-04-14 07:08:30 +0000334void CodeGenModule::SetLLVMFunctionAttributes(const Decl *D,
Mike Stump1eb44332009-09-09 15:08:12 +0000335 const CGFunctionInfo &Info,
Daniel Dunbar7dbd8192009-04-14 07:08:30 +0000336 llvm::Function *F) {
Daniel Dunbarca6408c2009-09-12 00:59:20 +0000337 unsigned CallingConv;
Devang Patel761d7f72008-09-25 21:02:23 +0000338 AttributeListType AttributeList;
Daniel Dunbarca6408c2009-09-12 00:59:20 +0000339 ConstructAttributeList(Info, D, AttributeList, CallingConv);
Devang Patel761d7f72008-09-25 21:02:23 +0000340 F->setAttributes(llvm::AttrListPtr::get(AttributeList.begin(),
Daniel Dunbarca6408c2009-09-12 00:59:20 +0000341 AttributeList.size()));
342 F->setCallingConv(static_cast<llvm::CallingConv::ID>(CallingConv));
Daniel Dunbarf80519b2008-09-04 23:41:35 +0000343}
344
Daniel Dunbar7c65e992009-04-14 08:05:55 +0000345void CodeGenModule::SetLLVMFunctionAttributesForDefinition(const Decl *D,
346 llvm::Function *F) {
Daniel Dunbar74ac74a2009-03-02 04:58:03 +0000347 if (!Features.Exceptions && !Features.ObjCNonFragileABI)
Mike Stump1eb44332009-09-09 15:08:12 +0000348 F->addFnAttr(llvm::Attribute::NoUnwind);
Daniel Dunbaraf668b02008-10-28 00:17:57 +0000349
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +0000350 if (D->hasAttr<AlwaysInlineAttr>())
Daniel Dunbaraf668b02008-10-28 00:17:57 +0000351 F->addFnAttr(llvm::Attribute::AlwaysInline);
Mike Stump1eb44332009-09-09 15:08:12 +0000352
Mike Stump1feade82009-08-26 22:31:08 +0000353 if (D->hasAttr<NoInlineAttr>())
Anders Carlsson81ebbde2009-02-19 19:22:11 +0000354 F->addFnAttr(llvm::Attribute::NoInline);
Mike Stumpf55314d2009-10-05 21:58:44 +0000355
Anders Carlssonfd015352009-11-16 16:56:03 +0000356 if (Features.getStackProtectorMode() == LangOptions::SSPOn)
357 F->addFnAttr(llvm::Attribute::StackProtect);
358 else if (Features.getStackProtectorMode() == LangOptions::SSPReq)
359 F->addFnAttr(llvm::Attribute::StackProtectReq);
360
Sean Huntbbd37c62009-11-21 08:43:09 +0000361 if (const AlignedAttr *AA = D->getAttr<AlignedAttr>()) {
362 unsigned width = Context.Target.getCharWidth();
363 F->setAlignment(AA->getAlignment() / width);
364 while ((AA = AA->getNext<AlignedAttr>()))
365 F->setAlignment(std::max(F->getAlignment(), AA->getAlignment() / width));
366 }
Mike Stumpfb51ddf2009-10-05 22:49:20 +0000367 // C++ ABI requires 2-byte alignment for member functions.
Mike Stumpbd6dbd12009-10-05 23:08:21 +0000368 if (F->getAlignment() < 2 && isa<CXXMethodDecl>(D))
369 F->setAlignment(2);
Daniel Dunbarf80519b2008-09-04 23:41:35 +0000370}
371
Mike Stump1eb44332009-09-09 15:08:12 +0000372void CodeGenModule::SetCommonAttributes(const Decl *D,
Daniel Dunbar7c65e992009-04-14 08:05:55 +0000373 llvm::GlobalValue *GV) {
374 setGlobalVisibility(GV, D);
375
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +0000376 if (D->hasAttr<UsedAttr>())
Daniel Dunbar7c65e992009-04-14 08:05:55 +0000377 AddUsedGlobal(GV);
378
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +0000379 if (const SectionAttr *SA = D->getAttr<SectionAttr>())
Daniel Dunbar7c65e992009-04-14 08:05:55 +0000380 GV->setSection(SA->getName());
381}
382
Daniel Dunbar0e4f40e2009-04-17 00:48:04 +0000383void CodeGenModule::SetInternalFunctionAttributes(const Decl *D,
384 llvm::Function *F,
385 const CGFunctionInfo &FI) {
386 SetLLVMFunctionAttributes(D, FI, F);
387 SetLLVMFunctionAttributesForDefinition(D, F);
Daniel Dunbar7c65e992009-04-14 08:05:55 +0000388
389 F->setLinkage(llvm::Function::InternalLinkage);
390
Daniel Dunbar0e4f40e2009-04-17 00:48:04 +0000391 SetCommonAttributes(D, F);
Daniel Dunbarf80519b2008-09-04 23:41:35 +0000392}
393
394void CodeGenModule::SetFunctionAttributes(const FunctionDecl *FD,
Eli Friedmanc6c14d12009-05-26 01:22:57 +0000395 llvm::Function *F,
396 bool IsIncompleteFunction) {
397 if (!IsIncompleteFunction)
398 SetLLVMFunctionAttributes(FD, getTypes().getFunctionInfo(FD), F);
Mike Stump1eb44332009-09-09 15:08:12 +0000399
Daniel Dunbar7c65e992009-04-14 08:05:55 +0000400 // Only a few attributes are set on declarations; these may later be
401 // overridden by a definition.
Mike Stump1eb44332009-09-09 15:08:12 +0000402
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +0000403 if (FD->hasAttr<DLLImportAttr>()) {
Daniel Dunbar7c65e992009-04-14 08:05:55 +0000404 F->setLinkage(llvm::Function::DLLImportLinkage);
Mike Stump1eb44332009-09-09 15:08:12 +0000405 } else if (FD->hasAttr<WeakAttr>() ||
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +0000406 FD->hasAttr<WeakImportAttr>()) {
Daniel Dunbar7c65e992009-04-14 08:05:55 +0000407 // "extern_weak" is overloaded in LLVM; we probably should have
Mike Stump1eb44332009-09-09 15:08:12 +0000408 // separate linkage types for this.
Daniel Dunbar7c65e992009-04-14 08:05:55 +0000409 F->setLinkage(llvm::Function::ExternalWeakLinkage);
410 } else {
Mike Stump1eb44332009-09-09 15:08:12 +0000411 F->setLinkage(llvm::Function::ExternalLinkage);
Daniel Dunbar7c65e992009-04-14 08:05:55 +0000412 }
413
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +0000414 if (const SectionAttr *SA = FD->getAttr<SectionAttr>())
Daniel Dunbar7c65e992009-04-14 08:05:55 +0000415 F->setSection(SA->getName());
Daniel Dunbar219df662008-09-08 23:44:31 +0000416}
417
Daniel Dunbar02698712009-02-13 20:29:50 +0000418void CodeGenModule::AddUsedGlobal(llvm::GlobalValue *GV) {
Mike Stump1eb44332009-09-09 15:08:12 +0000419 assert(!GV->isDeclaration() &&
Daniel Dunbar02698712009-02-13 20:29:50 +0000420 "Only globals with definition can force usage.");
Chris Lattner35f38a22009-03-31 22:37:52 +0000421 LLVMUsed.push_back(GV);
Daniel Dunbar02698712009-02-13 20:29:50 +0000422}
423
424void CodeGenModule::EmitLLVMUsed() {
425 // Don't create llvm.used if there is no need.
Chris Lattnerad64e022009-07-17 23:57:13 +0000426 if (LLVMUsed.empty())
Daniel Dunbar02698712009-02-13 20:29:50 +0000427 return;
428
Benjamin Kramer3c0ef8c2009-10-13 10:07:13 +0000429 const llvm::Type *i8PTy = llvm::Type::getInt8PtrTy(VMContext);
Mike Stump1eb44332009-09-09 15:08:12 +0000430
Chris Lattner35f38a22009-03-31 22:37:52 +0000431 // Convert LLVMUsed to what ConstantArray needs.
432 std::vector<llvm::Constant*> UsedArray;
433 UsedArray.resize(LLVMUsed.size());
434 for (unsigned i = 0, e = LLVMUsed.size(); i != e; ++i) {
Mike Stump1eb44332009-09-09 15:08:12 +0000435 UsedArray[i] =
436 llvm::ConstantExpr::getBitCast(cast<llvm::Constant>(&*LLVMUsed[i]),
Owen Andersona1cf15f2009-07-14 23:10:40 +0000437 i8PTy);
Chris Lattner35f38a22009-03-31 22:37:52 +0000438 }
Mike Stump1eb44332009-09-09 15:08:12 +0000439
Fariborz Jahanianc38e9af2009-06-23 21:47:46 +0000440 if (UsedArray.empty())
441 return;
Owen Anderson96e0fc72009-07-29 22:16:19 +0000442 llvm::ArrayType *ATy = llvm::ArrayType::get(i8PTy, UsedArray.size());
Mike Stump1eb44332009-09-09 15:08:12 +0000443
444 llvm::GlobalVariable *GV =
445 new llvm::GlobalVariable(getModule(), ATy, false,
Daniel Dunbar02698712009-02-13 20:29:50 +0000446 llvm::GlobalValue::AppendingLinkage,
Owen Anderson7db6d832009-07-28 18:33:04 +0000447 llvm::ConstantArray::get(ATy, UsedArray),
Owen Anderson1c431b32009-07-08 19:05:04 +0000448 "llvm.used");
Daniel Dunbar02698712009-02-13 20:29:50 +0000449
450 GV->setSection("llvm.metadata");
451}
452
453void CodeGenModule::EmitDeferred() {
Chris Lattner67b00522009-03-21 09:44:56 +0000454 // Emit code for any potentially referenced deferred decls. Since a
455 // previously unused static decl may become used during the generation of code
456 // for a static function, iterate until no changes are made.
457 while (!DeferredDeclsToEmit.empty()) {
Anders Carlsson2a131fb2009-05-05 04:44:02 +0000458 GlobalDecl D = DeferredDeclsToEmit.back();
Chris Lattner67b00522009-03-21 09:44:56 +0000459 DeferredDeclsToEmit.pop_back();
460
461 // The mangled name for the decl must have been emitted in GlobalDeclMap.
462 // Look it up to see if it was defined with a stronger definition (e.g. an
463 // extern inline function with a strong function redefinition). If so,
464 // just ignore the deferred decl.
465 llvm::GlobalValue *CGRef = GlobalDeclMap[getMangledName(D)];
466 assert(CGRef && "Deferred decl wasn't referenced?");
Mike Stump1eb44332009-09-09 15:08:12 +0000467
Chris Lattner67b00522009-03-21 09:44:56 +0000468 if (!CGRef->isDeclaration())
469 continue;
Mike Stump1eb44332009-09-09 15:08:12 +0000470
Mike Stumpef372012010-01-05 18:48:04 +0000471 // Skip available externally functions at -O0
472 // FIXME: these aren't instantiated yet, so we can't yet do this.
473 if (0 && getCodeGenOpts().OptimizationLevel == 0)
474 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D.getDecl())) {
475 GVALinkage Linkage = GetLinkageForFunction(getContext(), FD, Features);
476
477 if (Linkage == GVA_C99Inline)
478 continue;
479 }
480
Chris Lattner67b00522009-03-21 09:44:56 +0000481 // Otherwise, emit the definition and move on to the next one.
482 EmitGlobalDefinition(D);
483 }
Reid Spencer5f016e22007-07-11 17:01:13 +0000484}
485
Mike Stump1eb44332009-09-09 15:08:12 +0000486/// EmitAnnotateAttr - Generate the llvm::ConstantStruct which contains the
Nate Begeman8bd4afe2008-04-19 04:17:09 +0000487/// annotation information for a given GlobalValue. The annotation struct is
Mike Stump1eb44332009-09-09 15:08:12 +0000488/// {i8 *, i8 *, i8 *, i32}. The first field is a constant expression, the
489/// GlobalValue being annotated. The second field is the constant string
490/// created from the AnnotateAttr's annotation. The third field is a constant
Nate Begeman8bd4afe2008-04-19 04:17:09 +0000491/// string containing the name of the translation unit. The fourth field is
492/// the line number in the file of the annotated value declaration.
493///
494/// FIXME: this does not unique the annotation string constants, as llvm-gcc
495/// appears to.
496///
Mike Stump1eb44332009-09-09 15:08:12 +0000497llvm::Constant *CodeGenModule::EmitAnnotateAttr(llvm::GlobalValue *GV,
Nate Begeman8bd4afe2008-04-19 04:17:09 +0000498 const AnnotateAttr *AA,
499 unsigned LineNo) {
500 llvm::Module *M = &getModule();
501
502 // get [N x i8] constants for the annotation string, and the filename string
503 // which are the 2nd and 3rd elements of the global annotation structure.
Benjamin Kramer3c0ef8c2009-10-13 10:07:13 +0000504 const llvm::Type *SBP = llvm::Type::getInt8PtrTy(VMContext);
Mike Stump1eb44332009-09-09 15:08:12 +0000505 llvm::Constant *anno = llvm::ConstantArray::get(VMContext,
Owen Anderson0032b272009-08-13 21:57:51 +0000506 AA->getAnnotation(), true);
507 llvm::Constant *unit = llvm::ConstantArray::get(VMContext,
508 M->getModuleIdentifier(),
Nate Begeman8bd4afe2008-04-19 04:17:09 +0000509 true);
510
511 // Get the two global values corresponding to the ConstantArrays we just
512 // created to hold the bytes of the strings.
Mike Stump1eb44332009-09-09 15:08:12 +0000513 llvm::GlobalValue *annoGV =
Chris Lattner95b851e2009-07-16 05:03:48 +0000514 new llvm::GlobalVariable(*M, anno->getType(), false,
515 llvm::GlobalValue::PrivateLinkage, anno,
516 GV->getName());
Nate Begeman8bd4afe2008-04-19 04:17:09 +0000517 // translation unit name string, emitted into the llvm.metadata section.
518 llvm::GlobalValue *unitGV =
Chris Lattner95b851e2009-07-16 05:03:48 +0000519 new llvm::GlobalVariable(*M, unit->getType(), false,
Mike Stump1eb44332009-09-09 15:08:12 +0000520 llvm::GlobalValue::PrivateLinkage, unit,
Chris Lattner95b851e2009-07-16 05:03:48 +0000521 ".str");
Nate Begeman8bd4afe2008-04-19 04:17:09 +0000522
Daniel Dunbar57d5cee2009-04-14 22:41:13 +0000523 // Create the ConstantStruct for the global annotation.
Nate Begeman8bd4afe2008-04-19 04:17:09 +0000524 llvm::Constant *Fields[4] = {
Owen Anderson3c4972d2009-07-29 18:54:39 +0000525 llvm::ConstantExpr::getBitCast(GV, SBP),
526 llvm::ConstantExpr::getBitCast(annoGV, SBP),
527 llvm::ConstantExpr::getBitCast(unitGV, SBP),
Owen Anderson0032b272009-08-13 21:57:51 +0000528 llvm::ConstantInt::get(llvm::Type::getInt32Ty(VMContext), LineNo)
Nate Begeman8bd4afe2008-04-19 04:17:09 +0000529 };
Owen Anderson47a434f2009-08-05 23:18:46 +0000530 return llvm::ConstantStruct::get(VMContext, Fields, 4, false);
Nate Begeman8bd4afe2008-04-19 04:17:09 +0000531}
532
Daniel Dunbar73241df2009-02-13 21:18:01 +0000533bool CodeGenModule::MayDeferGeneration(const ValueDecl *Global) {
Daniel Dunbar5c61d972009-02-13 22:08:43 +0000534 // Never defer when EmitAllDecls is specified or the decl has
535 // attribute used.
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +0000536 if (Features.EmitAllDecls || Global->hasAttr<UsedAttr>())
Daniel Dunbar73241df2009-02-13 21:18:01 +0000537 return false;
Daniel Dunbarbd012ff2008-07-29 23:18:29 +0000538
539 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(Global)) {
Daniel Dunbar73241df2009-02-13 21:18:01 +0000540 // Constructors and destructors should never be deferred.
Mike Stump1eb44332009-09-09 15:08:12 +0000541 if (FD->hasAttr<ConstructorAttr>() ||
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +0000542 FD->hasAttr<DestructorAttr>())
Daniel Dunbar73241df2009-02-13 21:18:01 +0000543 return false;
544
Eli Friedman61eab882009-12-08 03:56:49 +0000545 // The key function for a class must never be deferred.
546 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Global)) {
547 const CXXRecordDecl *RD = MD->getParent();
548 if (MD->isOutOfLine() && RD->isDynamicClass()) {
549 const CXXMethodDecl *KeyFunction = getContext().getKeyFunction(RD);
Douglas Gregorbd6d6192010-01-05 19:06:31 +0000550 if (KeyFunction &&
551 KeyFunction->getCanonicalDecl() == MD->getCanonicalDecl())
Eli Friedman61eab882009-12-08 03:56:49 +0000552 return false;
553 }
554 }
555
Douglas Gregor68584ed2009-06-18 16:11:24 +0000556 GVALinkage Linkage = GetLinkageForFunction(getContext(), FD, Features);
Mike Stump1eb44332009-09-09 15:08:12 +0000557
Chris Lattnerdbb5a372009-04-14 06:44:48 +0000558 // static, static inline, always_inline, and extern inline functions can
Chris Lattner86daeee2009-04-14 16:44:36 +0000559 // always be deferred. Normal inline functions can be deferred in C99/C++.
Chris Lattnercbb8fc12009-04-14 20:25:53 +0000560 if (Linkage == GVA_Internal || Linkage == GVA_C99Inline ||
Eli Friedmanab189952009-12-25 05:29:40 +0000561 Linkage == GVA_CXXInline || Linkage == GVA_TemplateInstantiation)
Chris Lattnerdbb5a372009-04-14 06:44:48 +0000562 return true;
Chris Lattnerdbb5a372009-04-14 06:44:48 +0000563 return false;
Daniel Dunbar73241df2009-02-13 21:18:01 +0000564 }
Mike Stump1eb44332009-09-09 15:08:12 +0000565
Chris Lattnerdbb5a372009-04-14 06:44:48 +0000566 const VarDecl *VD = cast<VarDecl>(Global);
567 assert(VD->isFileVarDecl() && "Invalid decl");
Douglas Gregorb6c8c8b2009-04-21 17:11:58 +0000568
Anders Carlsson74d644a2009-10-08 17:28:59 +0000569 // We never want to defer structs that have non-trivial constructors or
570 // destructors.
571
572 // FIXME: Handle references.
573 if (const RecordType *RT = VD->getType()->getAs<RecordType>()) {
574 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(RT->getDecl())) {
575 if (!RD->hasTrivialConstructor() || !RD->hasTrivialDestructor())
576 return false;
577 }
578 }
579
Douglas Gregor1028c9f2009-10-14 21:29:40 +0000580 // Static data may be deferred, but out-of-line static data members
581 // cannot be.
Fariborz Jahanian393c2472009-11-05 18:03:03 +0000582 if (VD->isInAnonymousNamespace())
583 return true;
Eli Friedmanbd94ab92009-11-26 02:52:12 +0000584 if (VD->getLinkage() == VarDecl::InternalLinkage) {
Fariborz Jahanian393c2472009-11-05 18:03:03 +0000585 // Initializer has side effects?
586 if (VD->getInit() && VD->getInit()->HasSideEffects(Context))
587 return false;
588 return !(VD->isStaticDataMember() && VD->isOutOfLine());
589 }
590 return false;
Daniel Dunbar73241df2009-02-13 21:18:01 +0000591}
592
Chris Lattnerb4880ba2009-05-12 21:21:08 +0000593void CodeGenModule::EmitGlobal(GlobalDecl GD) {
Anders Carlsson4a6835e2009-09-10 23:38:47 +0000594 const ValueDecl *Global = cast<ValueDecl>(GD.getDecl());
Mike Stump1eb44332009-09-09 15:08:12 +0000595
Chris Lattnerbd532712009-03-22 21:47:11 +0000596 // If this is an alias definition (which otherwise looks like a declaration)
597 // emit it now.
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +0000598 if (Global->hasAttr<AliasAttr>())
Chris Lattnerbd532712009-03-22 21:47:11 +0000599 return EmitAliasDefinition(Global);
Daniel Dunbar219df662008-09-08 23:44:31 +0000600
Chris Lattner67b00522009-03-21 09:44:56 +0000601 // Ignore declarations, they will be emitted on their first use.
Daniel Dunbar5e1e1f92009-03-19 08:27:24 +0000602 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(Global)) {
Daniel Dunbar73241df2009-02-13 21:18:01 +0000603 // Forward declarations are emitted lazily on first use.
604 if (!FD->isThisDeclarationADefinition())
605 return;
Daniel Dunbar02698712009-02-13 20:29:50 +0000606 } else {
607 const VarDecl *VD = cast<VarDecl>(Global);
Daniel Dunbarbd012ff2008-07-29 23:18:29 +0000608 assert(VD->isFileVarDecl() && "Cannot emit local var decl as global.");
609
Anders Carlsson1b3171d2009-12-04 23:50:01 +0000610 if (getLangOptions().CPlusPlus && !VD->getInit()) {
611 // In C++, if this is marked "extern", defer code generation.
612 if (VD->getStorageClass() == VarDecl::Extern || VD->isExternC())
613 return;
614
615 // If this is a declaration of an explicit specialization of a static
616 // data member in a class template, don't emit it.
617 if (VD->isStaticDataMember() &&
618 VD->getTemplateSpecializationKind() == TSK_ExplicitSpecialization)
619 return;
620 }
Douglas Gregorb6c8c8b2009-04-21 17:11:58 +0000621
622 // In C, if this isn't a definition, defer code generation.
623 if (!getLangOptions().CPlusPlus && !VD->getInit())
624 return;
Nate Begeman4c13b7a2008-04-20 06:29:50 +0000625 }
626
Chris Lattner67b00522009-03-21 09:44:56 +0000627 // Defer code generation when possible if this is a static definition, inline
628 // function etc. These we only want to emit if they are used.
Daniel Dunbar73241df2009-02-13 21:18:01 +0000629 if (MayDeferGeneration(Global)) {
Chris Lattner67b00522009-03-21 09:44:56 +0000630 // If the value has already been used, add it directly to the
631 // DeferredDeclsToEmit list.
Anders Carlsson2a131fb2009-05-05 04:44:02 +0000632 const char *MangledName = getMangledName(GD);
Chris Lattner67b00522009-03-21 09:44:56 +0000633 if (GlobalDeclMap.count(MangledName))
Anders Carlsson2a131fb2009-05-05 04:44:02 +0000634 DeferredDeclsToEmit.push_back(GD);
Chris Lattner67b00522009-03-21 09:44:56 +0000635 else {
636 // Otherwise, remember that we saw a deferred decl with this name. The
637 // first use of the mangled name will cause it to move into
638 // DeferredDeclsToEmit.
Anders Carlsson2a131fb2009-05-05 04:44:02 +0000639 DeferredDecls[MangledName] = GD;
Chris Lattner67b00522009-03-21 09:44:56 +0000640 }
Daniel Dunbarbd012ff2008-07-29 23:18:29 +0000641 return;
642 }
643
644 // Otherwise emit the definition.
Anders Carlsson2a131fb2009-05-05 04:44:02 +0000645 EmitGlobalDefinition(GD);
Nate Begeman4c13b7a2008-04-20 06:29:50 +0000646}
647
Chris Lattnerb4880ba2009-05-12 21:21:08 +0000648void CodeGenModule::EmitGlobalDefinition(GlobalDecl GD) {
Anders Carlsson4a6835e2009-09-10 23:38:47 +0000649 const ValueDecl *D = cast<ValueDecl>(GD.getDecl());
Mike Stump1eb44332009-09-09 15:08:12 +0000650
Anders Carlsson8e2efcc2009-10-27 14:32:27 +0000651 PrettyStackTraceDecl CrashInfo((ValueDecl *)D, D->getLocation(),
652 Context.getSourceManager(),
653 "Generating code for declaration");
654
Eli Friedman72649ed2009-12-06 22:01:30 +0000655 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) {
Anders Carlsson1a5e0d72009-11-30 23:41:22 +0000656 getVtableInfo().MaybeEmitVtable(GD);
Eli Friedman72649ed2009-12-06 22:01:30 +0000657 if (MD->isVirtual() && MD->isOutOfLine() &&
658 (!isa<CXXDestructorDecl>(D) || GD.getDtorType() != Dtor_Base)) {
Eli Friedmanb455f0e2009-12-07 23:56:34 +0000659 if (isa<CXXDestructorDecl>(D)) {
660 GlobalDecl CanonGD(cast<CXXDestructorDecl>(D->getCanonicalDecl()),
661 GD.getDtorType());
662 BuildThunksForVirtual(CanonGD);
663 } else {
664 BuildThunksForVirtual(MD->getCanonicalDecl());
665 }
Eli Friedman72649ed2009-12-06 22:01:30 +0000666 }
667 }
Anders Carlsson1a5e0d72009-11-30 23:41:22 +0000668
Anders Carlsson2a131fb2009-05-05 04:44:02 +0000669 if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(D))
670 EmitCXXConstructor(CD, GD.getCtorType());
Anders Carlsson7267c162009-05-29 21:03:38 +0000671 else if (const CXXDestructorDecl *DD = dyn_cast<CXXDestructorDecl>(D))
672 EmitCXXDestructor(DD, GD.getDtorType());
Chris Lattnerb4880ba2009-05-12 21:21:08 +0000673 else if (isa<FunctionDecl>(D))
674 EmitGlobalFunctionDefinition(GD);
Anders Carlsson2a131fb2009-05-05 04:44:02 +0000675 else if (const VarDecl *VD = dyn_cast<VarDecl>(D))
Daniel Dunbarbd012ff2008-07-29 23:18:29 +0000676 EmitGlobalVarDefinition(VD);
Anders Carlsson2a131fb2009-05-05 04:44:02 +0000677 else {
Daniel Dunbarbd012ff2008-07-29 23:18:29 +0000678 assert(0 && "Invalid argument to EmitGlobalDefinition()");
679 }
680}
681
Chris Lattner74391b42009-03-22 21:03:39 +0000682/// GetOrCreateLLVMFunction - If the specified mangled name is not in the
683/// module, create and return an llvm Function with the specified type. If there
684/// is something in the module with the specified name, return it potentially
685/// bitcasted to the right type.
686///
687/// If D is non-null, it specifies a decl that correspond to this. This is used
688/// to set the attributes on the function when it is first created.
689llvm::Constant *CodeGenModule::GetOrCreateLLVMFunction(const char *MangledName,
690 const llvm::Type *Ty,
Chris Lattnerb4880ba2009-05-12 21:21:08 +0000691 GlobalDecl D) {
Chris Lattner0558e792009-03-21 09:25:43 +0000692 // Lookup the entry, lazily creating it if necessary.
Chris Lattner0558e792009-03-21 09:25:43 +0000693 llvm::GlobalValue *&Entry = GlobalDeclMap[MangledName];
694 if (Entry) {
695 if (Entry->getType()->getElementType() == Ty)
696 return Entry;
Mike Stump1eb44332009-09-09 15:08:12 +0000697
Chris Lattner0558e792009-03-21 09:25:43 +0000698 // Make sure the result is of the correct type.
Owen Anderson96e0fc72009-07-29 22:16:19 +0000699 const llvm::Type *PTy = llvm::PointerType::getUnqual(Ty);
Owen Anderson3c4972d2009-07-29 18:54:39 +0000700 return llvm::ConstantExpr::getBitCast(Entry, PTy);
Chris Lattner0558e792009-03-21 09:25:43 +0000701 }
Mike Stump1eb44332009-09-09 15:08:12 +0000702
Eli Friedman654ad402009-11-09 05:07:37 +0000703 // This function doesn't have a complete type (for example, the return
704 // type is an incomplete struct). Use a fake type instead, and make
705 // sure not to try to set attributes.
706 bool IsIncompleteFunction = false;
707 if (!isa<llvm::FunctionType>(Ty)) {
708 Ty = llvm::FunctionType::get(llvm::Type::getVoidTy(VMContext),
709 std::vector<const llvm::Type*>(), false);
710 IsIncompleteFunction = true;
711 }
712 llvm::Function *F = llvm::Function::Create(cast<llvm::FunctionType>(Ty),
713 llvm::Function::ExternalLinkage,
714 "", &getModule());
715 F->setName(MangledName);
716 if (D.getDecl())
717 SetFunctionAttributes(cast<FunctionDecl>(D.getDecl()), F,
718 IsIncompleteFunction);
719 Entry = F;
720
Chris Lattner67b00522009-03-21 09:44:56 +0000721 // This is the first use or definition of a mangled name. If there is a
722 // deferred decl with this name, remember that we need to emit it at the end
723 // of the file.
Mike Stump1eb44332009-09-09 15:08:12 +0000724 llvm::DenseMap<const char*, GlobalDecl>::iterator DDI =
Chris Lattner9fa959d2009-05-12 20:58:15 +0000725 DeferredDecls.find(MangledName);
Chris Lattner67b00522009-03-21 09:44:56 +0000726 if (DDI != DeferredDecls.end()) {
727 // Move the potentially referenced deferred decl to the DeferredDeclsToEmit
728 // list, and remove it from DeferredDecls (since we don't need it anymore).
729 DeferredDeclsToEmit.push_back(DDI->second);
730 DeferredDecls.erase(DDI);
Chris Lattnerb4880ba2009-05-12 21:21:08 +0000731 } else if (const FunctionDecl *FD = cast_or_null<FunctionDecl>(D.getDecl())) {
Chris Lattner0c337ed2009-05-12 21:02:27 +0000732 // If this the first reference to a C++ inline function in a class, queue up
733 // the deferred function body for emission. These are not seen as
734 // top-level declarations.
Chris Lattnerb4880ba2009-05-12 21:21:08 +0000735 if (FD->isThisDeclarationADefinition() && MayDeferGeneration(FD))
736 DeferredDeclsToEmit.push_back(D);
Fariborz Jahanianc7ff8e12009-07-30 23:22:00 +0000737 // A called constructor which has no definition or declaration need be
738 // synthesized.
739 else if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(FD)) {
Eli Friedman15233e52009-11-26 07:40:08 +0000740 if (CD->isImplicit())
741 DeferredDeclsToEmit.push_back(D);
742 } else if (const CXXDestructorDecl *DD = dyn_cast<CXXDestructorDecl>(FD)) {
743 if (DD->isImplicit())
744 DeferredDeclsToEmit.push_back(D);
745 } else if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) {
746 if (MD->isCopyAssignment() && MD->isImplicit())
Fariborz Jahanianc7ff8e12009-07-30 23:22:00 +0000747 DeferredDeclsToEmit.push_back(D);
748 }
Chris Lattner67b00522009-03-21 09:44:56 +0000749 }
Mike Stump1eb44332009-09-09 15:08:12 +0000750
Chris Lattner0558e792009-03-21 09:25:43 +0000751 return F;
752}
753
Chris Lattner74391b42009-03-22 21:03:39 +0000754/// GetAddrOfFunction - Return the address of the given function. If Ty is
755/// non-null, then this function will use the specified type if it has to
756/// create it (this occurs when we see a definition of the function).
Chris Lattnerb4880ba2009-05-12 21:21:08 +0000757llvm::Constant *CodeGenModule::GetAddrOfFunction(GlobalDecl GD,
Chris Lattner74391b42009-03-22 21:03:39 +0000758 const llvm::Type *Ty) {
759 // If there was no specific requested type, just convert it now.
760 if (!Ty)
Anders Carlsson4a6835e2009-09-10 23:38:47 +0000761 Ty = getTypes().ConvertType(cast<ValueDecl>(GD.getDecl())->getType());
Douglas Gregor4fe95f92009-09-04 19:04:08 +0000762 return GetOrCreateLLVMFunction(getMangledName(GD), Ty, GD);
Chris Lattner74391b42009-03-22 21:03:39 +0000763}
Eli Friedman77ba7082008-05-30 19:50:47 +0000764
Chris Lattner74391b42009-03-22 21:03:39 +0000765/// CreateRuntimeFunction - Create a new runtime function with the specified
766/// type and name.
767llvm::Constant *
768CodeGenModule::CreateRuntimeFunction(const llvm::FunctionType *FTy,
769 const char *Name) {
770 // Convert Name to be a uniqued string from the IdentifierInfo table.
Daniel Dunbare013d682009-10-18 20:26:12 +0000771 Name = getContext().Idents.get(Name).getNameStart();
Chris Lattnerb4880ba2009-05-12 21:21:08 +0000772 return GetOrCreateLLVMFunction(Name, FTy, GlobalDecl());
Chris Lattner74391b42009-03-22 21:03:39 +0000773}
Daniel Dunbarbd012ff2008-07-29 23:18:29 +0000774
Eli Friedman20e098b2009-12-11 21:23:03 +0000775static bool DeclIsConstantGlobal(ASTContext &Context, const VarDecl *D) {
776 if (!D->getType().isConstant(Context))
777 return false;
778 if (Context.getLangOptions().CPlusPlus &&
779 Context.getBaseElementType(D->getType())->getAs<RecordType>()) {
780 // FIXME: We should do something fancier here!
781 return false;
782 }
783 return true;
784}
785
Chris Lattner74391b42009-03-22 21:03:39 +0000786/// GetOrCreateLLVMGlobal - If the specified mangled name is not in the module,
787/// create and return an llvm GlobalVariable with the specified type. If there
788/// is something in the module with the specified name, return it potentially
789/// bitcasted to the right type.
790///
791/// If D is non-null, it specifies a decl that correspond to this. This is used
792/// to set the attributes on the global when it is first created.
793llvm::Constant *CodeGenModule::GetOrCreateLLVMGlobal(const char *MangledName,
794 const llvm::PointerType*Ty,
795 const VarDecl *D) {
Daniel Dunbar3c827a72008-08-05 23:31:02 +0000796 // Lookup the entry, lazily creating it if necessary.
Chris Lattner5d4f5c72009-03-21 08:06:59 +0000797 llvm::GlobalValue *&Entry = GlobalDeclMap[MangledName];
Chris Lattner99b53612009-03-21 08:03:33 +0000798 if (Entry) {
Chris Lattner74391b42009-03-22 21:03:39 +0000799 if (Entry->getType() == Ty)
Chris Lattner570585c2009-03-21 09:16:30 +0000800 return Entry;
Mike Stump1eb44332009-09-09 15:08:12 +0000801
Chris Lattner99b53612009-03-21 08:03:33 +0000802 // Make sure the result is of the correct type.
Owen Anderson3c4972d2009-07-29 18:54:39 +0000803 return llvm::ConstantExpr::getBitCast(Entry, Ty);
Daniel Dunbar49988882009-01-13 02:25:00 +0000804 }
Mike Stump1eb44332009-09-09 15:08:12 +0000805
Chris Lattner67b00522009-03-21 09:44:56 +0000806 // This is the first use or definition of a mangled name. If there is a
807 // deferred decl with this name, remember that we need to emit it at the end
808 // of the file.
Mike Stump1eb44332009-09-09 15:08:12 +0000809 llvm::DenseMap<const char*, GlobalDecl>::iterator DDI =
Chris Lattner67b00522009-03-21 09:44:56 +0000810 DeferredDecls.find(MangledName);
811 if (DDI != DeferredDecls.end()) {
812 // Move the potentially referenced deferred decl to the DeferredDeclsToEmit
813 // list, and remove it from DeferredDecls (since we don't need it anymore).
814 DeferredDeclsToEmit.push_back(DDI->second);
815 DeferredDecls.erase(DDI);
816 }
Mike Stump1eb44332009-09-09 15:08:12 +0000817
818 llvm::GlobalVariable *GV =
819 new llvm::GlobalVariable(getModule(), Ty->getElementType(), false,
Chris Lattner99b53612009-03-21 08:03:33 +0000820 llvm::GlobalValue::ExternalLinkage,
Mike Stump1eb44332009-09-09 15:08:12 +0000821 0, "", 0,
Eli Friedman56ebe502009-04-19 21:05:03 +0000822 false, Ty->getAddressSpace());
Chris Lattnerd9726782009-03-22 00:12:30 +0000823 GV->setName(MangledName);
Chris Lattner99b53612009-03-21 08:03:33 +0000824
825 // Handle things which are present even on external declarations.
Chris Lattner74391b42009-03-22 21:03:39 +0000826 if (D) {
Mike Stumpf5408fe2009-05-16 07:57:57 +0000827 // FIXME: This code is overly simple and should be merged with other global
828 // handling.
Eli Friedman20e098b2009-12-11 21:23:03 +0000829 GV->setConstant(DeclIsConstantGlobal(Context, D));
Chris Lattner99b53612009-03-21 08:03:33 +0000830
Chris Lattner74391b42009-03-22 21:03:39 +0000831 // FIXME: Merge with other attribute handling code.
832 if (D->getStorageClass() == VarDecl::PrivateExtern)
Daniel Dunbar04d40782009-04-14 06:00:08 +0000833 GV->setVisibility(llvm::GlobalValue::HiddenVisibility);
Chris Lattner99b53612009-03-21 08:03:33 +0000834
Mike Stump1eb44332009-09-09 15:08:12 +0000835 if (D->hasAttr<WeakAttr>() ||
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +0000836 D->hasAttr<WeakImportAttr>())
Chris Lattner74391b42009-03-22 21:03:39 +0000837 GV->setLinkage(llvm::GlobalValue::ExternalWeakLinkage);
Eli Friedman56ebe502009-04-19 21:05:03 +0000838
839 GV->setThreadLocal(D->isThreadSpecified());
Chris Lattner74391b42009-03-22 21:03:39 +0000840 }
Mike Stump1eb44332009-09-09 15:08:12 +0000841
Chris Lattner99b53612009-03-21 08:03:33 +0000842 return Entry = GV;
Daniel Dunbarbd012ff2008-07-29 23:18:29 +0000843}
844
Chris Lattner74391b42009-03-22 21:03:39 +0000845
846/// GetAddrOfGlobalVar - Return the llvm::Constant for the address of the
847/// given global variable. If Ty is non-null and if the global doesn't exist,
848/// then it will be greated with the specified type instead of whatever the
849/// normal requested type would be.
850llvm::Constant *CodeGenModule::GetAddrOfGlobalVar(const VarDecl *D,
851 const llvm::Type *Ty) {
852 assert(D->hasGlobalStorage() && "Not a global variable");
853 QualType ASTTy = D->getType();
854 if (Ty == 0)
855 Ty = getTypes().ConvertTypeForMem(ASTTy);
Mike Stump1eb44332009-09-09 15:08:12 +0000856
857 const llvm::PointerType *PTy =
Owen Anderson96e0fc72009-07-29 22:16:19 +0000858 llvm::PointerType::get(Ty, ASTTy.getAddressSpace());
Chris Lattner74391b42009-03-22 21:03:39 +0000859 return GetOrCreateLLVMGlobal(getMangledName(D), PTy, D);
860}
861
862/// CreateRuntimeVariable - Create a new runtime global variable with the
863/// specified type and name.
864llvm::Constant *
865CodeGenModule::CreateRuntimeVariable(const llvm::Type *Ty,
866 const char *Name) {
867 // Convert Name to be a uniqued string from the IdentifierInfo table.
Daniel Dunbare013d682009-10-18 20:26:12 +0000868 Name = getContext().Idents.get(Name).getNameStart();
Owen Anderson96e0fc72009-07-29 22:16:19 +0000869 return GetOrCreateLLVMGlobal(Name, llvm::PointerType::getUnqual(Ty), 0);
Chris Lattner74391b42009-03-22 21:03:39 +0000870}
871
Daniel Dunbar03f5ad92009-04-15 22:08:45 +0000872void CodeGenModule::EmitTentativeDefinition(const VarDecl *D) {
873 assert(!D->getInit() && "Cannot emit definite definitions here!");
874
Douglas Gregor7520bd12009-04-21 19:28:58 +0000875 if (MayDeferGeneration(D)) {
876 // If we have not seen a reference to this variable yet, place it
877 // into the deferred declarations table to be emitted if needed
878 // later.
879 const char *MangledName = getMangledName(D);
880 if (GlobalDeclMap.count(MangledName) == 0) {
Anders Carlsson555b4bb2009-09-10 23:43:36 +0000881 DeferredDecls[MangledName] = D;
Daniel Dunbar03f5ad92009-04-15 22:08:45 +0000882 return;
Douglas Gregor7520bd12009-04-21 19:28:58 +0000883 }
884 }
885
886 // The tentative definition is the only definition.
Daniel Dunbar03f5ad92009-04-15 22:08:45 +0000887 EmitGlobalVarDefinition(D);
888}
889
Douglas Gregor4b0f21c2010-01-06 20:27:16 +0000890llvm::GlobalVariable::LinkageTypes
891CodeGenModule::getVtableLinkage(const CXXRecordDecl *RD) {
892 // Get the key function.
893 const CXXMethodDecl *KeyFunction = getContext().getKeyFunction(RD);
894
895 if (KeyFunction) {
896 const FunctionDecl *Def = 0;
897 if (KeyFunction->getBody(Def))
898 KeyFunction = cast<CXXMethodDecl>(Def);
899 }
900
901 if (RD->isInAnonymousNamespace() || !RD->hasLinkage())
902 return llvm::GlobalVariable::InternalLinkage;
903 else if (KeyFunction) {
904 switch (KeyFunction->getTemplateSpecializationKind()) {
905 case TSK_Undeclared:
906 case TSK_ExplicitSpecialization:
907 if (KeyFunction->isInlined())
908 return llvm::GlobalVariable::WeakODRLinkage;
909
910 return llvm::GlobalVariable::ExternalLinkage;
911
912 case TSK_ImplicitInstantiation:
913 case TSK_ExplicitInstantiationDefinition:
914 return llvm::GlobalVariable::WeakODRLinkage;
915
916 case TSK_ExplicitInstantiationDeclaration:
917 // FIXME: Use available_externally linkage. However, this currently
918 // breaks LLVM's build due to undefined symbols.
919 // return llvm::GlobalVariable::AvailableExternallyLinkage;
920 return llvm::GlobalVariable::WeakODRLinkage;
921 }
922 } else if (KeyFunction) {
923 return llvm::GlobalVariable::WeakODRLinkage;
924 } else {
925 switch (RD->getTemplateSpecializationKind()) {
926 case TSK_Undeclared:
927 case TSK_ExplicitSpecialization:
928 case TSK_ImplicitInstantiation:
929 case TSK_ExplicitInstantiationDefinition:
930 return llvm::GlobalVariable::WeakODRLinkage;
931
932 case TSK_ExplicitInstantiationDeclaration:
933 // FIXME: Use available_externally linkage. However, this currently
934 // breaks LLVM's build due to undefined symbols.
935 // return llvm::GlobalVariable::AvailableExternallyLinkage;
936 return llvm::GlobalVariable::WeakODRLinkage;
937 }
938 }
939
940 // Silence GCC warning.
941 return llvm::GlobalVariable::WeakODRLinkage;
942}
943
Douglas Gregor1028c9f2009-10-14 21:29:40 +0000944static CodeGenModule::GVALinkage
945GetLinkageForVariable(ASTContext &Context, const VarDecl *VD) {
946 // Everything located semantically within an anonymous namespace is
947 // always internal.
948 if (VD->isInAnonymousNamespace())
949 return CodeGenModule::GVA_Internal;
950
951 // Handle linkage for static data members.
952 if (VD->isStaticDataMember()) {
953 switch (VD->getTemplateSpecializationKind()) {
954 case TSK_Undeclared:
955 case TSK_ExplicitSpecialization:
956 case TSK_ExplicitInstantiationDefinition:
957 return CodeGenModule::GVA_StrongExternal;
958
959 case TSK_ExplicitInstantiationDeclaration:
Jeffrey Yasskin9f61aa92009-12-12 05:05:38 +0000960 llvm_unreachable("Variable should not be instantiated");
Douglas Gregor1028c9f2009-10-14 21:29:40 +0000961 // Fall through to treat this like any other instantiation.
962
963 case TSK_ImplicitInstantiation:
964 return CodeGenModule::GVA_TemplateInstantiation;
965 }
966 }
Eli Friedmanbd94ab92009-11-26 02:52:12 +0000967
968 if (VD->getLinkage() == VarDecl::InternalLinkage)
Douglas Gregor1028c9f2009-10-14 21:29:40 +0000969 return CodeGenModule::GVA_Internal;
970
971 return CodeGenModule::GVA_StrongExternal;
972}
973
Daniel Dunbarbd012ff2008-07-29 23:18:29 +0000974void CodeGenModule::EmitGlobalVarDefinition(const VarDecl *D) {
Chris Lattner8f32f712007-07-14 00:23:28 +0000975 llvm::Constant *Init = 0;
Eli Friedman77ba7082008-05-30 19:50:47 +0000976 QualType ASTTy = D->getType();
Mike Stump1eb44332009-09-09 15:08:12 +0000977
Chris Lattner8f32f712007-07-14 00:23:28 +0000978 if (D->getInit() == 0) {
Eli Friedmancd5f4aa2008-05-30 20:39:54 +0000979 // This is a tentative definition; tentative definitions are
Daniel Dunbar03f5ad92009-04-15 22:08:45 +0000980 // implicitly initialized with { 0 }.
981 //
982 // Note that tentative definitions are only emitted at the end of
983 // a translation unit, so they should never have incomplete
984 // type. In addition, EmitTentativeDefinition makes sure that we
985 // never attempt to emit a tentative definition if a real one
986 // exists. A use may still exists, however, so we still may need
987 // to do a RAUW.
988 assert(!ASTTy->isIncompleteType() && "Unexpected incomplete type");
Anders Carlssonb0d0ea02009-08-02 21:18:22 +0000989 Init = EmitNullConstant(D->getType());
Eli Friedman77ba7082008-05-30 19:50:47 +0000990 } else {
Anders Carlssone9352cc2009-04-08 04:48:15 +0000991 Init = EmitConstantExpr(D->getInit(), D->getType());
Mike Stump1eb44332009-09-09 15:08:12 +0000992
Eli Friedman6e656f42009-02-20 01:18:21 +0000993 if (!Init) {
Eli Friedman6e656f42009-02-20 01:18:21 +0000994 QualType T = D->getInit()->getType();
Anders Carlsson89ed31d2009-08-08 23:24:23 +0000995 if (getLangOptions().CPlusPlus) {
996 CXXGlobalInits.push_back(D);
997 Init = EmitNullConstant(T);
998 } else {
999 ErrorUnsupported(D, "static initializer");
1000 Init = llvm::UndefValue::get(getTypes().ConvertType(T));
1001 }
Eli Friedman6e656f42009-02-20 01:18:21 +00001002 }
Eli Friedman77ba7082008-05-30 19:50:47 +00001003 }
Eli Friedman77ba7082008-05-30 19:50:47 +00001004
Chris Lattner2d584062009-03-21 08:13:05 +00001005 const llvm::Type* InitType = Init->getType();
Chris Lattner570585c2009-03-21 09:16:30 +00001006 llvm::Constant *Entry = GetAddrOfGlobalVar(D, InitType);
Mike Stump1eb44332009-09-09 15:08:12 +00001007
Chris Lattner570585c2009-03-21 09:16:30 +00001008 // Strip off a bitcast if we got one back.
1009 if (llvm::ConstantExpr *CE = dyn_cast<llvm::ConstantExpr>(Entry)) {
Chris Lattner9d4a15f2009-07-16 16:48:25 +00001010 assert(CE->getOpcode() == llvm::Instruction::BitCast ||
1011 // all zero index gep.
1012 CE->getOpcode() == llvm::Instruction::GetElementPtr);
Chris Lattner570585c2009-03-21 09:16:30 +00001013 Entry = CE->getOperand(0);
1014 }
Mike Stump1eb44332009-09-09 15:08:12 +00001015
Chris Lattner570585c2009-03-21 09:16:30 +00001016 // Entry is now either a Function or GlobalVariable.
1017 llvm::GlobalVariable *GV = dyn_cast<llvm::GlobalVariable>(Entry);
Mike Stump1eb44332009-09-09 15:08:12 +00001018
Chris Lattner570585c2009-03-21 09:16:30 +00001019 // We have a definition after a declaration with the wrong type.
1020 // We must make a new GlobalVariable* and update everything that used OldGV
1021 // (a declaration or tentative definition) with the new GlobalVariable*
1022 // (which will be a definition).
1023 //
1024 // This happens if there is a prototype for a global (e.g.
1025 // "extern int x[];") and then a definition of a different type (e.g.
1026 // "int x[10];"). This also happens when an initializer has a different type
1027 // from the type of the global (this happens with unions).
Chris Lattner570585c2009-03-21 09:16:30 +00001028 if (GV == 0 ||
1029 GV->getType()->getElementType() != InitType ||
1030 GV->getType()->getAddressSpace() != ASTTy.getAddressSpace()) {
Mike Stump1eb44332009-09-09 15:08:12 +00001031
Chris Lattner570585c2009-03-21 09:16:30 +00001032 // Remove the old entry from GlobalDeclMap so that we'll create a new one.
1033 GlobalDeclMap.erase(getMangledName(D));
Daniel Dunbar232350d2009-02-19 05:36:41 +00001034
Chris Lattner570585c2009-03-21 09:16:30 +00001035 // Make a new global with the correct type, this is now guaranteed to work.
1036 GV = cast<llvm::GlobalVariable>(GetAddrOfGlobalVar(D, InitType));
Chris Lattner0558e792009-03-21 09:25:43 +00001037 GV->takeName(cast<llvm::GlobalValue>(Entry));
1038
Eli Friedman77ba7082008-05-30 19:50:47 +00001039 // Replace all uses of the old global with the new global
Mike Stump1eb44332009-09-09 15:08:12 +00001040 llvm::Constant *NewPtrForOldDecl =
Owen Anderson3c4972d2009-07-29 18:54:39 +00001041 llvm::ConstantExpr::getBitCast(GV, Entry->getType());
Chris Lattner570585c2009-03-21 09:16:30 +00001042 Entry->replaceAllUsesWith(NewPtrForOldDecl);
Eli Friedman77ba7082008-05-30 19:50:47 +00001043
1044 // Erase the old global, since it is no longer used.
Chris Lattner570585c2009-03-21 09:16:30 +00001045 cast<llvm::GlobalValue>(Entry)->eraseFromParent();
Chris Lattner8f32f712007-07-14 00:23:28 +00001046 }
Devang Patel8e53e722007-10-26 16:31:40 +00001047
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +00001048 if (const AnnotateAttr *AA = D->getAttr<AnnotateAttr>()) {
Nate Begeman8bd4afe2008-04-19 04:17:09 +00001049 SourceManager &SM = Context.getSourceManager();
1050 AddAnnotation(EmitAnnotateAttr(GV, AA,
Chris Lattnerf7cf85b2009-01-16 07:36:28 +00001051 SM.getInstantiationLineNumber(D->getLocation())));
Nate Begeman8bd4afe2008-04-19 04:17:09 +00001052 }
1053
Chris Lattner88a69ad2007-07-13 05:13:43 +00001054 GV->setInitializer(Init);
Chris Lattnere78b86f2009-08-05 05:20:29 +00001055
1056 // If it is safe to mark the global 'constant', do so now.
1057 GV->setConstant(false);
Eli Friedman20e098b2009-12-11 21:23:03 +00001058 if (DeclIsConstantGlobal(Context, D))
Chris Lattnere78b86f2009-08-05 05:20:29 +00001059 GV->setConstant(true);
Mike Stump1eb44332009-09-09 15:08:12 +00001060
Eli Friedman0de40af2009-02-27 04:11:37 +00001061 GV->setAlignment(getContext().getDeclAlignInBytes(D));
Eli Friedman08d78022008-05-29 11:10:27 +00001062
Chris Lattner88a69ad2007-07-13 05:13:43 +00001063 // Set the llvm linkage type as appropriate.
Douglas Gregor1028c9f2009-10-14 21:29:40 +00001064 GVALinkage Linkage = GetLinkageForVariable(getContext(), D);
Douglas Gregora0f00a72009-10-14 21:36:34 +00001065 if (Linkage == GVA_Internal)
Chris Lattner8fabd782008-05-04 01:44:26 +00001066 GV->setLinkage(llvm::Function::InternalLinkage);
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +00001067 else if (D->hasAttr<DLLImportAttr>())
Chris Lattnerddee4232008-03-03 03:28:21 +00001068 GV->setLinkage(llvm::Function::DLLImportLinkage);
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +00001069 else if (D->hasAttr<DLLExportAttr>())
Chris Lattnerddee4232008-03-03 03:28:21 +00001070 GV->setLinkage(llvm::Function::DLLExportLinkage);
Chris Lattnere78b86f2009-08-05 05:20:29 +00001071 else if (D->hasAttr<WeakAttr>()) {
1072 if (GV->isConstant())
1073 GV->setLinkage(llvm::GlobalVariable::WeakODRLinkage);
1074 else
1075 GV->setLinkage(llvm::GlobalVariable::WeakAnyLinkage);
Douglas Gregor1028c9f2009-10-14 21:29:40 +00001076 } else if (Linkage == GVA_TemplateInstantiation)
1077 GV->setLinkage(llvm::GlobalVariable::WeakAnyLinkage);
Daniel Dunbar1bc5c032009-11-30 08:40:34 +00001078 else if (!getLangOptions().CPlusPlus && !CodeGenOpts.NoCommon &&
Chris Lattner309457d2009-08-05 04:56:58 +00001079 !D->hasExternalStorage() && !D->getInit() &&
Chris Lattnere78b86f2009-08-05 05:20:29 +00001080 !D->getAttr<SectionAttr>()) {
Daniel Dunbar04d40782009-04-14 06:00:08 +00001081 GV->setLinkage(llvm::GlobalVariable::CommonLinkage);
Chris Lattnere78b86f2009-08-05 05:20:29 +00001082 // common vars aren't constant even if declared const.
1083 GV->setConstant(false);
1084 } else
Daniel Dunbar04d40782009-04-14 06:00:08 +00001085 GV->setLinkage(llvm::GlobalVariable::ExternalLinkage);
Daniel Dunbar7e714cd2009-04-10 20:26:50 +00001086
Daniel Dunbar7c65e992009-04-14 08:05:55 +00001087 SetCommonAttributes(D, GV);
Daniel Dunbar04d40782009-04-14 06:00:08 +00001088
Sanjiv Gupta686226b2008-06-05 08:59:10 +00001089 // Emit global variable debug information.
Chris Lattner2d584062009-03-21 08:13:05 +00001090 if (CGDebugInfo *DI = getDebugInfo()) {
Daniel Dunbar66031a52008-10-17 16:15:48 +00001091 DI->setLocation(D->getLocation());
Sanjiv Gupta686226b2008-06-05 08:59:10 +00001092 DI->EmitGlobalVariable(GV, D);
1093 }
Chris Lattner88a69ad2007-07-13 05:13:43 +00001094}
Reid Spencer5f016e22007-07-11 17:01:13 +00001095
Chris Lattnerbdb01322009-05-05 06:16:31 +00001096/// ReplaceUsesOfNonProtoTypeWithRealFunction - This function is called when we
1097/// implement a function with no prototype, e.g. "int foo() {}". If there are
1098/// existing call uses of the old function in the module, this adjusts them to
1099/// call the new function directly.
1100///
1101/// This is not just a cleanup: the always_inline pass requires direct calls to
1102/// functions to be able to inline them. If there is a bitcast in the way, it
1103/// won't inline them. Instcombine normally deletes these calls, but it isn't
1104/// run at -O0.
1105static void ReplaceUsesOfNonProtoTypeWithRealFunction(llvm::GlobalValue *Old,
1106 llvm::Function *NewFn) {
1107 // If we're redefining a global as a function, don't transform it.
1108 llvm::Function *OldFn = dyn_cast<llvm::Function>(Old);
1109 if (OldFn == 0) return;
Mike Stump1eb44332009-09-09 15:08:12 +00001110
Chris Lattnerbdb01322009-05-05 06:16:31 +00001111 const llvm::Type *NewRetTy = NewFn->getReturnType();
1112 llvm::SmallVector<llvm::Value*, 4> ArgList;
1113
1114 for (llvm::Value::use_iterator UI = OldFn->use_begin(), E = OldFn->use_end();
1115 UI != E; ) {
1116 // TODO: Do invokes ever occur in C code? If so, we should handle them too.
Chris Lattner08c93a72009-06-04 16:47:43 +00001117 unsigned OpNo = UI.getOperandNo();
Chris Lattnerbdb01322009-05-05 06:16:31 +00001118 llvm::CallInst *CI = dyn_cast<llvm::CallInst>(*UI++);
Chris Lattner08c93a72009-06-04 16:47:43 +00001119 if (!CI || OpNo != 0) continue;
Mike Stump1eb44332009-09-09 15:08:12 +00001120
Chris Lattnerbdb01322009-05-05 06:16:31 +00001121 // If the return types don't match exactly, and if the call isn't dead, then
1122 // we can't transform this call.
1123 if (CI->getType() != NewRetTy && !CI->use_empty())
1124 continue;
1125
1126 // If the function was passed too few arguments, don't transform. If extra
1127 // arguments were passed, we silently drop them. If any of the types
1128 // mismatch, we don't transform.
1129 unsigned ArgNo = 0;
1130 bool DontTransform = false;
1131 for (llvm::Function::arg_iterator AI = NewFn->arg_begin(),
1132 E = NewFn->arg_end(); AI != E; ++AI, ++ArgNo) {
1133 if (CI->getNumOperands()-1 == ArgNo ||
1134 CI->getOperand(ArgNo+1)->getType() != AI->getType()) {
1135 DontTransform = true;
1136 break;
1137 }
1138 }
1139 if (DontTransform)
1140 continue;
Mike Stump1eb44332009-09-09 15:08:12 +00001141
Chris Lattnerbdb01322009-05-05 06:16:31 +00001142 // Okay, we can transform this. Create the new call instruction and copy
1143 // over the required information.
1144 ArgList.append(CI->op_begin()+1, CI->op_begin()+1+ArgNo);
1145 llvm::CallInst *NewCall = llvm::CallInst::Create(NewFn, ArgList.begin(),
1146 ArgList.end(), "", CI);
1147 ArgList.clear();
Benjamin Kramerffbb15e2009-10-05 13:47:21 +00001148 if (!NewCall->getType()->isVoidTy())
Chris Lattnerbdb01322009-05-05 06:16:31 +00001149 NewCall->takeName(CI);
Chris Lattnerbdb01322009-05-05 06:16:31 +00001150 NewCall->setAttributes(CI->getAttributes());
Daniel Dunbarca6408c2009-09-12 00:59:20 +00001151 NewCall->setCallingConv(CI->getCallingConv());
Chris Lattnerbdb01322009-05-05 06:16:31 +00001152
1153 // Finally, remove the old call, replacing any uses with the new one.
Chris Lattner00549fc2009-10-14 05:49:21 +00001154 if (!CI->use_empty())
1155 CI->replaceAllUsesWith(NewCall);
Devang Patel3b122bc2009-10-13 17:02:04 +00001156
Devang Patelaa404542009-10-14 17:03:29 +00001157 // Copy any custom metadata attached with CI.
Chris Lattner12807082009-12-29 07:49:13 +00001158 if (llvm::MDNode *DbgNode = CI->getMetadata("dbg"))
1159 NewCall->setMetadata("dbg", DbgNode);
Chris Lattnerbdb01322009-05-05 06:16:31 +00001160 CI->eraseFromParent();
1161 }
1162}
1163
Daniel Dunbarbd012ff2008-07-29 23:18:29 +00001164
Chris Lattnerb4880ba2009-05-12 21:21:08 +00001165void CodeGenModule::EmitGlobalFunctionDefinition(GlobalDecl GD) {
Anders Carlsson2b77ba82009-04-04 20:47:02 +00001166 const llvm::FunctionType *Ty;
Chris Lattnerb4880ba2009-05-12 21:21:08 +00001167 const FunctionDecl *D = cast<FunctionDecl>(GD.getDecl());
Mike Stump1eb44332009-09-09 15:08:12 +00001168
Anders Carlsson2b77ba82009-04-04 20:47:02 +00001169 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) {
John McCall183700f2009-09-21 23:43:11 +00001170 bool isVariadic = D->getType()->getAs<FunctionProtoType>()->isVariadic();
Mike Stump1eb44332009-09-09 15:08:12 +00001171
Anders Carlsson2b77ba82009-04-04 20:47:02 +00001172 Ty = getTypes().GetFunctionType(getTypes().getFunctionInfo(MD), isVariadic);
1173 } else {
1174 Ty = cast<llvm::FunctionType>(getTypes().ConvertType(D->getType()));
Mike Stump1eb44332009-09-09 15:08:12 +00001175
Anders Carlsson2b77ba82009-04-04 20:47:02 +00001176 // As a special case, make sure that definitions of K&R function
1177 // "type foo()" aren't declared as varargs (which forces the backend
1178 // to do unnecessary work).
1179 if (D->getType()->isFunctionNoProtoType()) {
1180 assert(Ty->isVarArg() && "Didn't lower type as expected");
Mike Stump1eb44332009-09-09 15:08:12 +00001181 // Due to stret, the lowered function could have arguments.
1182 // Just create the same type as was lowered by ConvertType
Anders Carlsson2b77ba82009-04-04 20:47:02 +00001183 // but strip off the varargs bit.
1184 std::vector<const llvm::Type*> Args(Ty->param_begin(), Ty->param_end());
Owen Anderson96e0fc72009-07-29 22:16:19 +00001185 Ty = llvm::FunctionType::get(Ty->getReturnType(), Args, false);
Anders Carlsson2b77ba82009-04-04 20:47:02 +00001186 }
Chris Lattnerff75e1d2009-03-22 19:35:37 +00001187 }
Daniel Dunbard5d31802009-02-19 07:15:39 +00001188
Chris Lattner9fa959d2009-05-12 20:58:15 +00001189 // Get or create the prototype for the function.
Chris Lattnerb4880ba2009-05-12 21:21:08 +00001190 llvm::Constant *Entry = GetAddrOfFunction(GD, Ty);
Mike Stump1eb44332009-09-09 15:08:12 +00001191
Chris Lattner0558e792009-03-21 09:25:43 +00001192 // Strip off a bitcast if we got one back.
1193 if (llvm::ConstantExpr *CE = dyn_cast<llvm::ConstantExpr>(Entry)) {
1194 assert(CE->getOpcode() == llvm::Instruction::BitCast);
1195 Entry = CE->getOperand(0);
1196 }
Mike Stump1eb44332009-09-09 15:08:12 +00001197
1198
Chris Lattner0558e792009-03-21 09:25:43 +00001199 if (cast<llvm::GlobalValue>(Entry)->getType()->getElementType() != Ty) {
Chris Lattnerbdb01322009-05-05 06:16:31 +00001200 llvm::GlobalValue *OldFn = cast<llvm::GlobalValue>(Entry);
Mike Stump1eb44332009-09-09 15:08:12 +00001201
Daniel Dunbar42745812009-03-09 23:53:08 +00001202 // If the types mismatch then we have to rewrite the definition.
Chris Lattnerbdb01322009-05-05 06:16:31 +00001203 assert(OldFn->isDeclaration() &&
Chris Lattner0558e792009-03-21 09:25:43 +00001204 "Shouldn't replace non-declaration");
Chris Lattner34809502009-03-21 08:53:37 +00001205
Chris Lattner62b33ea2009-03-21 08:38:50 +00001206 // F is the Function* for the one with the wrong type, we must make a new
1207 // Function* and update everything that used F (a declaration) with the new
1208 // Function* (which will be a definition).
1209 //
1210 // This happens if there is a prototype for a function
1211 // (e.g. "int f()") and then a definition of a different type
1212 // (e.g. "int f(int x)"). Start by making a new function of the
1213 // correct type, RAUW, then steal the name.
Chris Lattner34809502009-03-21 08:53:37 +00001214 GlobalDeclMap.erase(getMangledName(D));
Chris Lattnerb4880ba2009-05-12 21:21:08 +00001215 llvm::Function *NewFn = cast<llvm::Function>(GetAddrOfFunction(GD, Ty));
Chris Lattnerbdb01322009-05-05 06:16:31 +00001216 NewFn->takeName(OldFn);
Mike Stump1eb44332009-09-09 15:08:12 +00001217
Chris Lattnerbdb01322009-05-05 06:16:31 +00001218 // If this is an implementation of a function without a prototype, try to
1219 // replace any existing uses of the function (which may be calls) with uses
1220 // of the new function
Chris Lattner9fa959d2009-05-12 20:58:15 +00001221 if (D->getType()->isFunctionNoProtoType()) {
Chris Lattnerbdb01322009-05-05 06:16:31 +00001222 ReplaceUsesOfNonProtoTypeWithRealFunction(OldFn, NewFn);
Chris Lattner9fa959d2009-05-12 20:58:15 +00001223 OldFn->removeDeadConstantUsers();
1224 }
Mike Stump1eb44332009-09-09 15:08:12 +00001225
Chris Lattner62b33ea2009-03-21 08:38:50 +00001226 // Replace uses of F with the Function we will endow with a body.
Chris Lattnerbdb01322009-05-05 06:16:31 +00001227 if (!Entry->use_empty()) {
Mike Stump1eb44332009-09-09 15:08:12 +00001228 llvm::Constant *NewPtrForOldDecl =
Owen Anderson3c4972d2009-07-29 18:54:39 +00001229 llvm::ConstantExpr::getBitCast(NewFn, Entry->getType());
Chris Lattnerbdb01322009-05-05 06:16:31 +00001230 Entry->replaceAllUsesWith(NewPtrForOldDecl);
1231 }
Mike Stump1eb44332009-09-09 15:08:12 +00001232
Chris Lattner62b33ea2009-03-21 08:38:50 +00001233 // Ok, delete the old function now, which is dead.
Chris Lattnerbdb01322009-05-05 06:16:31 +00001234 OldFn->eraseFromParent();
Mike Stump1eb44332009-09-09 15:08:12 +00001235
Chris Lattner0558e792009-03-21 09:25:43 +00001236 Entry = NewFn;
Daniel Dunbarbd012ff2008-07-29 23:18:29 +00001237 }
Mike Stump1eb44332009-09-09 15:08:12 +00001238
Chris Lattner0558e792009-03-21 09:25:43 +00001239 llvm::Function *Fn = cast<llvm::Function>(Entry);
Daniel Dunbarbd012ff2008-07-29 23:18:29 +00001240
Daniel Dunbar219df662008-09-08 23:44:31 +00001241 CodeGenFunction(*this).GenerateCode(D, Fn);
Daniel Dunbar6bfed7e2008-08-01 00:01:51 +00001242
Daniel Dunbar7c65e992009-04-14 08:05:55 +00001243 SetFunctionDefinitionAttributes(D, Fn);
1244 SetLLVMFunctionAttributesForDefinition(D, Fn);
Mike Stump1eb44332009-09-09 15:08:12 +00001245
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +00001246 if (const ConstructorAttr *CA = D->getAttr<ConstructorAttr>())
Daniel Dunbar219df662008-09-08 23:44:31 +00001247 AddGlobalCtor(Fn, CA->getPriority());
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +00001248 if (const DestructorAttr *DA = D->getAttr<DestructorAttr>())
Daniel Dunbar219df662008-09-08 23:44:31 +00001249 AddGlobalDtor(Fn, DA->getPriority());
Daniel Dunbarbd012ff2008-07-29 23:18:29 +00001250}
1251
Chris Lattnerbd532712009-03-22 21:47:11 +00001252void CodeGenModule::EmitAliasDefinition(const ValueDecl *D) {
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +00001253 const AliasAttr *AA = D->getAttr<AliasAttr>();
Chris Lattnerbd532712009-03-22 21:47:11 +00001254 assert(AA && "Not an alias?");
1255
1256 const llvm::Type *DeclTy = getTypes().ConvertTypeForMem(D->getType());
Mike Stump1eb44332009-09-09 15:08:12 +00001257
Chris Lattnerbd532712009-03-22 21:47:11 +00001258 // Unique the name through the identifier table.
1259 const char *AliaseeName = AA->getAliasee().c_str();
Daniel Dunbare013d682009-10-18 20:26:12 +00001260 AliaseeName = getContext().Idents.get(AliaseeName).getNameStart();
Chris Lattnerbd532712009-03-22 21:47:11 +00001261
1262 // Create a reference to the named value. This ensures that it is emitted
1263 // if a deferred decl.
1264 llvm::Constant *Aliasee;
1265 if (isa<llvm::FunctionType>(DeclTy))
Chris Lattnerb4880ba2009-05-12 21:21:08 +00001266 Aliasee = GetOrCreateLLVMFunction(AliaseeName, DeclTy, GlobalDecl());
Chris Lattnerbd532712009-03-22 21:47:11 +00001267 else
1268 Aliasee = GetOrCreateLLVMGlobal(AliaseeName,
Owen Anderson96e0fc72009-07-29 22:16:19 +00001269 llvm::PointerType::getUnqual(DeclTy), 0);
Chris Lattnerbd532712009-03-22 21:47:11 +00001270
1271 // Create the new alias itself, but don't set a name yet.
Mike Stump1eb44332009-09-09 15:08:12 +00001272 llvm::GlobalValue *GA =
Chris Lattnerbd532712009-03-22 21:47:11 +00001273 new llvm::GlobalAlias(Aliasee->getType(),
1274 llvm::Function::ExternalLinkage,
1275 "", Aliasee, &getModule());
Mike Stump1eb44332009-09-09 15:08:12 +00001276
Chris Lattnerbd532712009-03-22 21:47:11 +00001277 // See if there is already something with the alias' name in the module.
1278 const char *MangledName = getMangledName(D);
1279 llvm::GlobalValue *&Entry = GlobalDeclMap[MangledName];
Mike Stump1eb44332009-09-09 15:08:12 +00001280
Chris Lattnerbd532712009-03-22 21:47:11 +00001281 if (Entry && !Entry->isDeclaration()) {
1282 // If there is a definition in the module, then it wins over the alias.
1283 // This is dubious, but allow it to be safe. Just ignore the alias.
1284 GA->eraseFromParent();
1285 return;
1286 }
Mike Stump1eb44332009-09-09 15:08:12 +00001287
Chris Lattnerbd532712009-03-22 21:47:11 +00001288 if (Entry) {
1289 // If there is a declaration in the module, then we had an extern followed
1290 // by the alias, as in:
1291 // extern int test6();
1292 // ...
1293 // int test6() __attribute__((alias("test7")));
1294 //
1295 // Remove it and replace uses of it with the alias.
Mike Stump1eb44332009-09-09 15:08:12 +00001296
Owen Anderson3c4972d2009-07-29 18:54:39 +00001297 Entry->replaceAllUsesWith(llvm::ConstantExpr::getBitCast(GA,
Chris Lattnerbd532712009-03-22 21:47:11 +00001298 Entry->getType()));
Chris Lattnerbd532712009-03-22 21:47:11 +00001299 Entry->eraseFromParent();
1300 }
Mike Stump1eb44332009-09-09 15:08:12 +00001301
Chris Lattnerbd532712009-03-22 21:47:11 +00001302 // Now we know that there is no conflict, set the name.
1303 Entry = GA;
1304 GA->setName(MangledName);
1305
Daniel Dunbar7c65e992009-04-14 08:05:55 +00001306 // Set attributes which are particular to an alias; this is a
1307 // specialization of the attributes which may be set on a global
1308 // variable/function.
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +00001309 if (D->hasAttr<DLLExportAttr>()) {
Daniel Dunbar7c65e992009-04-14 08:05:55 +00001310 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
1311 // The dllexport attribute is ignored for undefined symbols.
Argyrios Kyrtzidis6fb0aee2009-06-30 02:35:26 +00001312 if (FD->getBody())
Daniel Dunbar7c65e992009-04-14 08:05:55 +00001313 GA->setLinkage(llvm::Function::DLLExportLinkage);
1314 } else {
1315 GA->setLinkage(llvm::Function::DLLExportLinkage);
1316 }
Mike Stump1eb44332009-09-09 15:08:12 +00001317 } else if (D->hasAttr<WeakAttr>() ||
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +00001318 D->hasAttr<WeakImportAttr>()) {
Daniel Dunbar7c65e992009-04-14 08:05:55 +00001319 GA->setLinkage(llvm::Function::WeakAnyLinkage);
1320 }
1321
1322 SetCommonAttributes(D, GA);
Chris Lattnerbd532712009-03-22 21:47:11 +00001323}
1324
Chris Lattnerb808c952009-03-22 21:56:56 +00001325/// getBuiltinLibFunction - Given a builtin id for a function like
1326/// "__builtin_fabsf", return a Function* for "fabsf".
Daniel Dunbar34771b52009-09-14 04:33:21 +00001327llvm::Value *CodeGenModule::getBuiltinLibFunction(const FunctionDecl *FD,
1328 unsigned BuiltinID) {
Douglas Gregor3e41d602009-02-13 23:20:09 +00001329 assert((Context.BuiltinInfo.isLibFunction(BuiltinID) ||
Mike Stump1eb44332009-09-09 15:08:12 +00001330 Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) &&
Douglas Gregor3e41d602009-02-13 23:20:09 +00001331 "isn't a lib fn");
Mike Stump1eb44332009-09-09 15:08:12 +00001332
Douglas Gregor3e41d602009-02-13 23:20:09 +00001333 // Get the name, skip over the __builtin_ prefix (if necessary).
1334 const char *Name = Context.BuiltinInfo.GetName(BuiltinID);
1335 if (Context.BuiltinInfo.isLibFunction(BuiltinID))
1336 Name += 10;
Mike Stump1eb44332009-09-09 15:08:12 +00001337
Mike Stump1eb44332009-09-09 15:08:12 +00001338 const llvm::FunctionType *Ty =
Eli Friedman386ca782009-12-09 03:05:59 +00001339 cast<llvm::FunctionType>(getTypes().ConvertType(FD->getType()));
Chris Lattnerbef20ac2007-08-31 04:31:45 +00001340
Chris Lattnerb808c952009-03-22 21:56:56 +00001341 // Unique the name through the identifier table.
Daniel Dunbare013d682009-10-18 20:26:12 +00001342 Name = getContext().Idents.get(Name).getNameStart();
Daniel Dunbar34771b52009-09-14 04:33:21 +00001343 return GetOrCreateLLVMFunction(Name, Ty, GlobalDecl(FD));
Chris Lattnerbef20ac2007-08-31 04:31:45 +00001344}
1345
Chris Lattner7acda7c2007-12-18 00:25:38 +00001346llvm::Function *CodeGenModule::getIntrinsic(unsigned IID,const llvm::Type **Tys,
1347 unsigned NumTys) {
1348 return llvm::Intrinsic::getDeclaration(&getModule(),
1349 (llvm::Intrinsic::ID)IID, Tys, NumTys);
1350}
Chris Lattnerbef20ac2007-08-31 04:31:45 +00001351
Reid Spencer5f016e22007-07-11 17:01:13 +00001352llvm::Function *CodeGenModule::getMemCpyFn() {
1353 if (MemCpyFn) return MemCpyFn;
Owen Anderson0032b272009-08-13 21:57:51 +00001354 const llvm::Type *IntPtr = TheTargetData.getIntPtrType(VMContext);
Chris Lattner4e8a9e82008-11-21 16:43:15 +00001355 return MemCpyFn = getIntrinsic(llvm::Intrinsic::memcpy, &IntPtr, 1);
Reid Spencer5f016e22007-07-11 17:01:13 +00001356}
Anders Carlssonc9e20912007-08-21 00:21:21 +00001357
Eli Friedman0c995092008-05-26 12:59:39 +00001358llvm::Function *CodeGenModule::getMemMoveFn() {
1359 if (MemMoveFn) return MemMoveFn;
Owen Anderson0032b272009-08-13 21:57:51 +00001360 const llvm::Type *IntPtr = TheTargetData.getIntPtrType(VMContext);
Chris Lattner4e8a9e82008-11-21 16:43:15 +00001361 return MemMoveFn = getIntrinsic(llvm::Intrinsic::memmove, &IntPtr, 1);
Eli Friedman0c995092008-05-26 12:59:39 +00001362}
1363
Lauro Ramos Venancio41ef30e2008-02-19 22:01:01 +00001364llvm::Function *CodeGenModule::getMemSetFn() {
1365 if (MemSetFn) return MemSetFn;
Owen Anderson0032b272009-08-13 21:57:51 +00001366 const llvm::Type *IntPtr = TheTargetData.getIntPtrType(VMContext);
Chris Lattner4e8a9e82008-11-21 16:43:15 +00001367 return MemSetFn = getIntrinsic(llvm::Intrinsic::memset, &IntPtr, 1);
Lauro Ramos Venancio41ef30e2008-02-19 22:01:01 +00001368}
Chris Lattner7acda7c2007-12-18 00:25:38 +00001369
Daniel Dunbar1d552912009-07-23 22:52:48 +00001370static llvm::StringMapEntry<llvm::Constant*> &
1371GetConstantCFStringEntry(llvm::StringMap<llvm::Constant*> &Map,
1372 const StringLiteral *Literal,
Daniel Dunbar70ee9752009-07-23 23:41:22 +00001373 bool TargetIsLSB,
Daniel Dunbar1d552912009-07-23 22:52:48 +00001374 bool &IsUTF16,
1375 unsigned &StringLength) {
Daniel Dunbardf4eee92009-09-22 03:27:52 +00001376 unsigned NumBytes = Literal->getByteLength();
Daniel Dunbar1d552912009-07-23 22:52:48 +00001377
Daniel Dunbarf015b032009-09-22 10:03:52 +00001378 // Check for simple case.
1379 if (!Literal->containsNonAsciiOrNull()) {
1380 StringLength = NumBytes;
1381 return Map.GetOrCreateValue(llvm::StringRef(Literal->getStrData(),
1382 StringLength));
1383 }
1384
Daniel Dunbar1d552912009-07-23 22:52:48 +00001385 // Otherwise, convert the UTF8 literals into a byte string.
1386 llvm::SmallVector<UTF16, 128> ToBuf(NumBytes);
1387 const UTF8 *FromPtr = (UTF8 *)Literal->getStrData();
1388 UTF16 *ToPtr = &ToBuf[0];
Mike Stump1eb44332009-09-09 15:08:12 +00001389
1390 ConversionResult Result = ConvertUTF8toUTF16(&FromPtr, FromPtr + NumBytes,
Daniel Dunbar1d552912009-07-23 22:52:48 +00001391 &ToPtr, ToPtr + NumBytes,
1392 strictConversion);
Mike Stump1eb44332009-09-09 15:08:12 +00001393
Daniel Dunbar1d552912009-07-23 22:52:48 +00001394 // Check for conversion failure.
1395 if (Result != conversionOK) {
1396 // FIXME: Have Sema::CheckObjCString() validate the UTF-8 string and remove
1397 // this duplicate code.
1398 assert(Result == sourceIllegal && "UTF-8 to UTF-16 conversion failed");
Daniel Dunbarf015b032009-09-22 10:03:52 +00001399 StringLength = NumBytes;
1400 return Map.GetOrCreateValue(llvm::StringRef(Literal->getStrData(),
1401 StringLength));
Daniel Dunbar1d552912009-07-23 22:52:48 +00001402 }
1403
Daniel Dunbar70ee9752009-07-23 23:41:22 +00001404 // ConvertUTF8toUTF16 returns the length in ToPtr.
Daniel Dunbar1d552912009-07-23 22:52:48 +00001405 StringLength = ToPtr - &ToBuf[0];
Daniel Dunbar70ee9752009-07-23 23:41:22 +00001406
1407 // Render the UTF-16 string into a byte array and convert to the target byte
1408 // order.
1409 //
1410 // FIXME: This isn't something we should need to do here.
1411 llvm::SmallString<128> AsBytes;
1412 AsBytes.reserve(StringLength * 2);
1413 for (unsigned i = 0; i != StringLength; ++i) {
1414 unsigned short Val = ToBuf[i];
1415 if (TargetIsLSB) {
1416 AsBytes.push_back(Val & 0xFF);
1417 AsBytes.push_back(Val >> 8);
1418 } else {
1419 AsBytes.push_back(Val >> 8);
1420 AsBytes.push_back(Val & 0xFF);
1421 }
1422 }
Daniel Dunbar434da482009-08-03 21:47:08 +00001423 // Append one extra null character, the second is automatically added by our
1424 // caller.
1425 AsBytes.push_back(0);
Daniel Dunbar70ee9752009-07-23 23:41:22 +00001426
Daniel Dunbar1d552912009-07-23 22:52:48 +00001427 IsUTF16 = true;
Daniel Dunbar70ee9752009-07-23 23:41:22 +00001428 return Map.GetOrCreateValue(llvm::StringRef(AsBytes.data(), AsBytes.size()));
Daniel Dunbar1d552912009-07-23 22:52:48 +00001429}
1430
1431llvm::Constant *
1432CodeGenModule::GetAddrOfConstantCFString(const StringLiteral *Literal) {
1433 unsigned StringLength = 0;
1434 bool isUTF16 = false;
1435 llvm::StringMapEntry<llvm::Constant*> &Entry =
Mike Stump1eb44332009-09-09 15:08:12 +00001436 GetConstantCFStringEntry(CFConstantStringMap, Literal,
Daniel Dunbar70ee9752009-07-23 23:41:22 +00001437 getTargetData().isLittleEndian(),
1438 isUTF16, StringLength);
Mike Stump1eb44332009-09-09 15:08:12 +00001439
Daniel Dunbar1d552912009-07-23 22:52:48 +00001440 if (llvm::Constant *C = Entry.getValue())
1441 return C;
Mike Stump1eb44332009-09-09 15:08:12 +00001442
Owen Anderson0032b272009-08-13 21:57:51 +00001443 llvm::Constant *Zero =
1444 llvm::Constant::getNullValue(llvm::Type::getInt32Ty(VMContext));
Daniel Dunbar3e9df992008-08-23 18:37:06 +00001445 llvm::Constant *Zeros[] = { Zero, Zero };
Mike Stump1eb44332009-09-09 15:08:12 +00001446
Chris Lattner9d4a15f2009-07-16 16:48:25 +00001447 // If we don't already have it, get __CFConstantStringClassReference.
Anders Carlssonc9e20912007-08-21 00:21:21 +00001448 if (!CFConstantStringClassRef) {
1449 const llvm::Type *Ty = getTypes().ConvertType(getContext().IntTy);
Owen Anderson96e0fc72009-07-29 22:16:19 +00001450 Ty = llvm::ArrayType::get(Ty, 0);
Mike Stump1eb44332009-09-09 15:08:12 +00001451 llvm::Constant *GV = CreateRuntimeVariable(Ty,
Chris Lattner9d4a15f2009-07-16 16:48:25 +00001452 "__CFConstantStringClassReference");
Daniel Dunbar3e9df992008-08-23 18:37:06 +00001453 // Decay array -> ptr
1454 CFConstantStringClassRef =
Owen Anderson3c4972d2009-07-29 18:54:39 +00001455 llvm::ConstantExpr::getGetElementPtr(GV, Zeros, 2);
Anders Carlssonc9e20912007-08-21 00:21:21 +00001456 }
Mike Stump1eb44332009-09-09 15:08:12 +00001457
Anders Carlssone3daa762008-11-15 18:54:24 +00001458 QualType CFTy = getContext().getCFConstantStringType();
Daniel Dunbar3e9df992008-08-23 18:37:06 +00001459
Mike Stump1eb44332009-09-09 15:08:12 +00001460 const llvm::StructType *STy =
Anders Carlssone3daa762008-11-15 18:54:24 +00001461 cast<llvm::StructType>(getTypes().ConvertType(CFTy));
1462
Anders Carlsson5add6832009-08-16 05:55:31 +00001463 std::vector<llvm::Constant*> Fields(4);
Douglas Gregor44b43212008-12-11 16:49:14 +00001464
Anders Carlssonc9e20912007-08-21 00:21:21 +00001465 // Class pointer.
Anders Carlsson5add6832009-08-16 05:55:31 +00001466 Fields[0] = CFConstantStringClassRef;
Mike Stump1eb44332009-09-09 15:08:12 +00001467
Anders Carlssonc9e20912007-08-21 00:21:21 +00001468 // Flags.
Daniel Dunbar3e9df992008-08-23 18:37:06 +00001469 const llvm::Type *Ty = getTypes().ConvertType(getContext().UnsignedIntTy);
Mike Stump1eb44332009-09-09 15:08:12 +00001470 Fields[1] = isUTF16 ? llvm::ConstantInt::get(Ty, 0x07d0) :
Anders Carlsson5add6832009-08-16 05:55:31 +00001471 llvm::ConstantInt::get(Ty, 0x07C8);
1472
Anders Carlssonc9e20912007-08-21 00:21:21 +00001473 // String pointer.
Owen Anderson0032b272009-08-13 21:57:51 +00001474 llvm::Constant *C = llvm::ConstantArray::get(VMContext, Entry.getKey().str());
Daniel Dunbara9668e02009-04-03 00:57:44 +00001475
Chris Lattner278b9f02009-10-14 05:55:45 +00001476 const char *Sect = 0;
Chris Lattner95b851e2009-07-16 05:03:48 +00001477 llvm::GlobalValue::LinkageTypes Linkage;
Chris Lattner278b9f02009-10-14 05:55:45 +00001478 bool isConstant;
Daniel Dunbara9668e02009-04-03 00:57:44 +00001479 if (isUTF16) {
Daniel Dunbara9668e02009-04-03 00:57:44 +00001480 Sect = getContext().Target.getUnicodeStringSection();
Chris Lattner278b9f02009-10-14 05:55:45 +00001481 // FIXME: why do utf strings get "_" labels instead of "L" labels?
Chris Lattner95b851e2009-07-16 05:03:48 +00001482 Linkage = llvm::GlobalValue::InternalLinkage;
Chris Lattner278b9f02009-10-14 05:55:45 +00001483 // Note: -fwritable-strings doesn't make unicode CFStrings writable, but
1484 // does make plain ascii ones writable.
Daniel Dunbara9668e02009-04-03 00:57:44 +00001485 isConstant = true;
Chris Lattner278b9f02009-10-14 05:55:45 +00001486 } else {
1487 Linkage = llvm::GlobalValue::PrivateLinkage;
1488 isConstant = !Features.WritableStrings;
Daniel Dunbara9668e02009-04-03 00:57:44 +00001489 }
Chris Lattner278b9f02009-10-14 05:55:45 +00001490
Mike Stump1eb44332009-09-09 15:08:12 +00001491 llvm::GlobalVariable *GV =
Chris Lattner278b9f02009-10-14 05:55:45 +00001492 new llvm::GlobalVariable(getModule(), C->getType(), isConstant, Linkage, C,
1493 ".str");
Daniel Dunbara9668e02009-04-03 00:57:44 +00001494 if (Sect)
Daniel Dunbar8e5c2b82009-03-31 23:42:16 +00001495 GV->setSection(Sect);
Daniel Dunbara9668e02009-04-03 00:57:44 +00001496 if (isUTF16) {
1497 unsigned Align = getContext().getTypeAlign(getContext().ShortTy)/8;
Mike Stump1eb44332009-09-09 15:08:12 +00001498 GV->setAlignment(Align);
Daniel Dunbara9668e02009-04-03 00:57:44 +00001499 }
Anders Carlsson5add6832009-08-16 05:55:31 +00001500 Fields[2] = llvm::ConstantExpr::getGetElementPtr(GV, Zeros, 2);
1501
Anders Carlssonc9e20912007-08-21 00:21:21 +00001502 // String length.
1503 Ty = getTypes().ConvertType(getContext().LongTy);
Anders Carlsson5add6832009-08-16 05:55:31 +00001504 Fields[3] = llvm::ConstantInt::get(Ty, StringLength);
Mike Stump1eb44332009-09-09 15:08:12 +00001505
Anders Carlssonc9e20912007-08-21 00:21:21 +00001506 // The struct.
Owen Anderson08e25242009-07-27 22:29:56 +00001507 C = llvm::ConstantStruct::get(STy, Fields);
Mike Stump1eb44332009-09-09 15:08:12 +00001508 GV = new llvm::GlobalVariable(getModule(), C->getType(), true,
1509 llvm::GlobalVariable::PrivateLinkage, C,
Chris Lattner95b851e2009-07-16 05:03:48 +00001510 "_unnamed_cfstring_");
Daniel Dunbar8e5c2b82009-03-31 23:42:16 +00001511 if (const char *Sect = getContext().Target.getCFStringSection())
1512 GV->setSection(Sect);
Daniel Dunbar1d552912009-07-23 22:52:48 +00001513 Entry.setValue(GV);
Mike Stump1eb44332009-09-09 15:08:12 +00001514
Anders Carlsson0c678292007-11-01 00:41:52 +00001515 return GV;
Anders Carlssonc9e20912007-08-21 00:21:21 +00001516}
Chris Lattner45e8cbd2007-11-28 05:34:05 +00001517
Daniel Dunbar61432932008-08-13 23:20:05 +00001518/// GetStringForStringLiteral - Return the appropriate bytes for a
Daniel Dunbar1e049762008-08-10 20:25:57 +00001519/// string literal, properly padded to match the literal type.
Daniel Dunbar61432932008-08-13 23:20:05 +00001520std::string CodeGenModule::GetStringForStringLiteral(const StringLiteral *E) {
Daniel Dunbar1e049762008-08-10 20:25:57 +00001521 const char *StrData = E->getStrData();
1522 unsigned Len = E->getByteLength();
1523
1524 const ConstantArrayType *CAT =
1525 getContext().getAsConstantArrayType(E->getType());
1526 assert(CAT && "String isn't pointer or array!");
Mike Stump1eb44332009-09-09 15:08:12 +00001527
Chris Lattnerdbb1ecc2009-02-26 23:01:51 +00001528 // Resize the string to the right size.
Daniel Dunbar1e049762008-08-10 20:25:57 +00001529 std::string Str(StrData, StrData+Len);
1530 uint64_t RealLen = CAT->getSize().getZExtValue();
Mike Stump1eb44332009-09-09 15:08:12 +00001531
Chris Lattnerdbb1ecc2009-02-26 23:01:51 +00001532 if (E->isWide())
1533 RealLen *= getContext().Target.getWCharWidth()/8;
Mike Stump1eb44332009-09-09 15:08:12 +00001534
Daniel Dunbar1e049762008-08-10 20:25:57 +00001535 Str.resize(RealLen, '\0');
Mike Stump1eb44332009-09-09 15:08:12 +00001536
Daniel Dunbar1e049762008-08-10 20:25:57 +00001537 return Str;
1538}
1539
Daniel Dunbar61432932008-08-13 23:20:05 +00001540/// GetAddrOfConstantStringFromLiteral - Return a pointer to a
1541/// constant array for the given string literal.
1542llvm::Constant *
1543CodeGenModule::GetAddrOfConstantStringFromLiteral(const StringLiteral *S) {
1544 // FIXME: This can be more efficient.
Eli Friedman7eb79c12009-11-16 05:55:46 +00001545 // FIXME: We shouldn't need to bitcast the constant in the wide string case.
1546 llvm::Constant *C = GetAddrOfConstantString(GetStringForStringLiteral(S));
1547 if (S->isWide()) {
1548 llvm::Type *DestTy =
1549 llvm::PointerType::getUnqual(getTypes().ConvertType(S->getType()));
1550 C = llvm::ConstantExpr::getBitCast(C, DestTy);
1551 }
1552 return C;
Daniel Dunbar61432932008-08-13 23:20:05 +00001553}
1554
Chris Lattnereaf2bb82009-02-24 22:18:39 +00001555/// GetAddrOfConstantStringFromObjCEncode - Return a pointer to a constant
1556/// array for the given ObjCEncodeExpr node.
1557llvm::Constant *
1558CodeGenModule::GetAddrOfConstantStringFromObjCEncode(const ObjCEncodeExpr *E) {
1559 std::string Str;
1560 getContext().getObjCEncodingForType(E->getEncodedType(), Str);
Eli Friedmana210f352009-03-07 20:17:55 +00001561
1562 return GetAddrOfConstantCString(Str);
Chris Lattnereaf2bb82009-02-24 22:18:39 +00001563}
1564
1565
Chris Lattnera7ad98f2008-02-11 00:02:17 +00001566/// GenerateWritableString -- Creates storage for a string literal.
Mike Stump1eb44332009-09-09 15:08:12 +00001567static llvm::Constant *GenerateStringLiteral(const std::string &str,
Chris Lattner45e8cbd2007-11-28 05:34:05 +00001568 bool constant,
Daniel Dunbar5fabf9d2008-10-17 21:56:50 +00001569 CodeGenModule &CGM,
1570 const char *GlobalName) {
Daniel Dunbar61432932008-08-13 23:20:05 +00001571 // Create Constant for this string literal. Don't add a '\0'.
Owen Anderson0032b272009-08-13 21:57:51 +00001572 llvm::Constant *C =
1573 llvm::ConstantArray::get(CGM.getLLVMContext(), str, false);
Mike Stump1eb44332009-09-09 15:08:12 +00001574
Chris Lattner45e8cbd2007-11-28 05:34:05 +00001575 // Create a global variable for this string
Mike Stump1eb44332009-09-09 15:08:12 +00001576 return new llvm::GlobalVariable(CGM.getModule(), C->getType(), constant,
Chris Lattner95b851e2009-07-16 05:03:48 +00001577 llvm::GlobalValue::PrivateLinkage,
Owen Anderson1c431b32009-07-08 19:05:04 +00001578 C, GlobalName);
Chris Lattner45e8cbd2007-11-28 05:34:05 +00001579}
1580
Daniel Dunbar61432932008-08-13 23:20:05 +00001581/// GetAddrOfConstantString - Returns a pointer to a character array
1582/// containing the literal. This contents are exactly that of the
1583/// given string, i.e. it will not be null terminated automatically;
1584/// see GetAddrOfConstantCString. Note that whether the result is
1585/// actually a pointer to an LLVM constant depends on
1586/// Feature.WriteableStrings.
1587///
1588/// The result has pointer to array type.
Daniel Dunbar5fabf9d2008-10-17 21:56:50 +00001589llvm::Constant *CodeGenModule::GetAddrOfConstantString(const std::string &str,
1590 const char *GlobalName) {
Daniel Dunbar8e5c2b82009-03-31 23:42:16 +00001591 bool IsConstant = !Features.WritableStrings;
1592
1593 // Get the default prefix if a name wasn't specified.
1594 if (!GlobalName)
Chris Lattner95b851e2009-07-16 05:03:48 +00001595 GlobalName = ".str";
Daniel Dunbar8e5c2b82009-03-31 23:42:16 +00001596
1597 // Don't share any string literals if strings aren't constant.
1598 if (!IsConstant)
Daniel Dunbar5fabf9d2008-10-17 21:56:50 +00001599 return GenerateStringLiteral(str, false, *this, GlobalName);
Mike Stump1eb44332009-09-09 15:08:12 +00001600
1601 llvm::StringMapEntry<llvm::Constant *> &Entry =
Chris Lattner95b851e2009-07-16 05:03:48 +00001602 ConstantStringMap.GetOrCreateValue(&str[0], &str[str.length()]);
Chris Lattner45e8cbd2007-11-28 05:34:05 +00001603
1604 if (Entry.getValue())
Chris Lattnereaf2bb82009-02-24 22:18:39 +00001605 return Entry.getValue();
Chris Lattner45e8cbd2007-11-28 05:34:05 +00001606
1607 // Create a global variable for this.
Daniel Dunbar5fabf9d2008-10-17 21:56:50 +00001608 llvm::Constant *C = GenerateStringLiteral(str, true, *this, GlobalName);
Chris Lattner45e8cbd2007-11-28 05:34:05 +00001609 Entry.setValue(C);
1610 return C;
1611}
Daniel Dunbar61432932008-08-13 23:20:05 +00001612
1613/// GetAddrOfConstantCString - Returns a pointer to a character
1614/// array containing the literal and a terminating '\-'
1615/// character. The result has pointer to array type.
Daniel Dunbar5fabf9d2008-10-17 21:56:50 +00001616llvm::Constant *CodeGenModule::GetAddrOfConstantCString(const std::string &str,
1617 const char *GlobalName){
Chris Lattnerc9f29c62008-12-09 19:10:54 +00001618 return GetAddrOfConstantString(str + '\0', GlobalName);
Daniel Dunbar61432932008-08-13 23:20:05 +00001619}
Daniel Dunbar41071de2008-08-15 23:26:23 +00001620
Daniel Dunbaraf05bb92008-08-26 08:29:31 +00001621/// EmitObjCPropertyImplementations - Emit information for synthesized
1622/// properties for an implementation.
Mike Stump1eb44332009-09-09 15:08:12 +00001623void CodeGenModule::EmitObjCPropertyImplementations(const
Daniel Dunbaraf05bb92008-08-26 08:29:31 +00001624 ObjCImplementationDecl *D) {
Mike Stump1eb44332009-09-09 15:08:12 +00001625 for (ObjCImplementationDecl::propimpl_iterator
Argyrios Kyrtzidis17945a02009-06-30 02:36:12 +00001626 i = D->propimpl_begin(), e = D->propimpl_end(); i != e; ++i) {
Daniel Dunbaraf05bb92008-08-26 08:29:31 +00001627 ObjCPropertyImplDecl *PID = *i;
Mike Stump1eb44332009-09-09 15:08:12 +00001628
Daniel Dunbaraf05bb92008-08-26 08:29:31 +00001629 // Dynamic is just for type-checking.
1630 if (PID->getPropertyImplementation() == ObjCPropertyImplDecl::Synthesize) {
1631 ObjCPropertyDecl *PD = PID->getPropertyDecl();
1632
1633 // Determine which methods need to be implemented, some may have
1634 // been overridden. Note that ::isSynthesized is not the method
1635 // we want, that just indicates if the decl came from a
1636 // property. What we want to know is if the method is defined in
1637 // this implementation.
Argyrios Kyrtzidis17945a02009-06-30 02:36:12 +00001638 if (!D->getInstanceMethod(PD->getGetterName()))
Fariborz Jahanianfef30b52008-12-09 20:23:04 +00001639 CodeGenFunction(*this).GenerateObjCGetter(
1640 const_cast<ObjCImplementationDecl *>(D), PID);
Daniel Dunbaraf05bb92008-08-26 08:29:31 +00001641 if (!PD->isReadOnly() &&
Argyrios Kyrtzidis17945a02009-06-30 02:36:12 +00001642 !D->getInstanceMethod(PD->getSetterName()))
Fariborz Jahanianfef30b52008-12-09 20:23:04 +00001643 CodeGenFunction(*this).GenerateObjCSetter(
1644 const_cast<ObjCImplementationDecl *>(D), PID);
Daniel Dunbaraf05bb92008-08-26 08:29:31 +00001645 }
1646 }
1647}
1648
Anders Carlsson91e20dd2009-04-02 05:55:18 +00001649/// EmitNamespace - Emit all declarations in a namespace.
Anders Carlsson984e0682009-04-01 00:58:25 +00001650void CodeGenModule::EmitNamespace(const NamespaceDecl *ND) {
Argyrios Kyrtzidis17945a02009-06-30 02:36:12 +00001651 for (RecordDecl::decl_iterator I = ND->decls_begin(), E = ND->decls_end();
Anders Carlsson984e0682009-04-01 00:58:25 +00001652 I != E; ++I)
1653 EmitTopLevelDecl(*I);
1654}
1655
Anders Carlsson91e20dd2009-04-02 05:55:18 +00001656// EmitLinkageSpec - Emit all declarations in a linkage spec.
1657void CodeGenModule::EmitLinkageSpec(const LinkageSpecDecl *LSD) {
Eli Friedmanf976be82009-08-01 20:48:04 +00001658 if (LSD->getLanguage() != LinkageSpecDecl::lang_c &&
1659 LSD->getLanguage() != LinkageSpecDecl::lang_cxx) {
Anders Carlsson91e20dd2009-04-02 05:55:18 +00001660 ErrorUnsupported(LSD, "linkage spec");
1661 return;
1662 }
1663
Argyrios Kyrtzidis17945a02009-06-30 02:36:12 +00001664 for (RecordDecl::decl_iterator I = LSD->decls_begin(), E = LSD->decls_end();
Anders Carlsson91e20dd2009-04-02 05:55:18 +00001665 I != E; ++I)
1666 EmitTopLevelDecl(*I);
1667}
1668
Daniel Dunbar41071de2008-08-15 23:26:23 +00001669/// EmitTopLevelDecl - Emit code for a single top level declaration.
1670void CodeGenModule::EmitTopLevelDecl(Decl *D) {
1671 // If an error has occurred, stop code generation, but continue
1672 // parsing and semantic analysis (to ensure all warnings and errors
1673 // are emitted).
1674 if (Diags.hasErrorOccurred())
1675 return;
1676
Douglas Gregor16e8be22009-06-29 17:30:29 +00001677 // Ignore dependent declarations.
1678 if (D->getDeclContext() && D->getDeclContext()->isDependentContext())
1679 return;
Mike Stump1eb44332009-09-09 15:08:12 +00001680
Daniel Dunbar41071de2008-08-15 23:26:23 +00001681 switch (D->getKind()) {
Anders Carlsson293361a2009-08-25 13:14:46 +00001682 case Decl::CXXConversion:
Anders Carlsson2b77ba82009-04-04 20:47:02 +00001683 case Decl::CXXMethod:
Daniel Dunbar41071de2008-08-15 23:26:23 +00001684 case Decl::Function:
Douglas Gregor16e8be22009-06-29 17:30:29 +00001685 // Skip function templates
1686 if (cast<FunctionDecl>(D)->getDescribedFunctionTemplate())
1687 return;
Mike Stump1eb44332009-09-09 15:08:12 +00001688
Anders Carlsson555b4bb2009-09-10 23:43:36 +00001689 EmitGlobal(cast<FunctionDecl>(D));
1690 break;
1691
Daniel Dunbar41071de2008-08-15 23:26:23 +00001692 case Decl::Var:
Anders Carlsson555b4bb2009-09-10 23:43:36 +00001693 EmitGlobal(cast<VarDecl>(D));
Daniel Dunbar41071de2008-08-15 23:26:23 +00001694 break;
1695
Anders Carlsson95d4e5d2009-04-15 15:55:24 +00001696 // C++ Decls
Daniel Dunbar41071de2008-08-15 23:26:23 +00001697 case Decl::Namespace:
Anders Carlsson984e0682009-04-01 00:58:25 +00001698 EmitNamespace(cast<NamespaceDecl>(D));
Daniel Dunbar41071de2008-08-15 23:26:23 +00001699 break;
Douglas Gregor9cfbe482009-06-20 00:51:54 +00001700 // No code generation needed.
John McCall9d0c6612009-11-17 09:33:40 +00001701 case Decl::UsingShadow:
Douglas Gregor9cfbe482009-06-20 00:51:54 +00001702 case Decl::Using:
Douglas Gregordd9967a2009-09-02 23:49:23 +00001703 case Decl::UsingDirective:
Douglas Gregor127102b2009-06-29 20:59:39 +00001704 case Decl::ClassTemplate:
1705 case Decl::FunctionTemplate:
Anders Carlsson018837b2009-09-23 19:19:16 +00001706 case Decl::NamespaceAlias:
Douglas Gregor9cfbe482009-06-20 00:51:54 +00001707 break;
Anders Carlsson95d4e5d2009-04-15 15:55:24 +00001708 case Decl::CXXConstructor:
Anders Carlsson1fe598c2009-11-24 05:16:24 +00001709 // Skip function templates
1710 if (cast<FunctionDecl>(D)->getDescribedFunctionTemplate())
1711 return;
1712
Anders Carlsson95d4e5d2009-04-15 15:55:24 +00001713 EmitCXXConstructors(cast<CXXConstructorDecl>(D));
1714 break;
Anders Carlsson27ae5362009-04-17 01:58:57 +00001715 case Decl::CXXDestructor:
1716 EmitCXXDestructors(cast<CXXDestructorDecl>(D));
1717 break;
Anders Carlsson36674d22009-06-11 21:22:55 +00001718
1719 case Decl::StaticAssert:
1720 // Nothing to do.
1721 break;
1722
Anders Carlsson95d4e5d2009-04-15 15:55:24 +00001723 // Objective-C Decls
Mike Stump1eb44332009-09-09 15:08:12 +00001724
Fariborz Jahanian38e24c72009-03-18 22:33:24 +00001725 // Forward declarations, no (immediate) code generation.
Daniel Dunbar41071de2008-08-15 23:26:23 +00001726 case Decl::ObjCClass:
Daniel Dunbar41071de2008-08-15 23:26:23 +00001727 case Decl::ObjCForwardProtocol:
Fariborz Jahanianb31cb7f2009-03-21 18:06:45 +00001728 case Decl::ObjCCategory:
Chris Lattner285d0db2009-04-01 02:36:43 +00001729 case Decl::ObjCInterface:
Chris Lattner285d0db2009-04-01 02:36:43 +00001730 break;
1731
Daniel Dunbar41071de2008-08-15 23:26:23 +00001732 case Decl::ObjCProtocol:
Fariborz Jahanianb31cb7f2009-03-21 18:06:45 +00001733 Runtime->GenerateProtocol(cast<ObjCProtocolDecl>(D));
Daniel Dunbar41071de2008-08-15 23:26:23 +00001734 break;
1735
1736 case Decl::ObjCCategoryImpl:
Daniel Dunbaraf05bb92008-08-26 08:29:31 +00001737 // Categories have properties but don't support synthesize so we
1738 // can ignore them here.
Daniel Dunbar41071de2008-08-15 23:26:23 +00001739 Runtime->GenerateCategory(cast<ObjCCategoryImplDecl>(D));
1740 break;
1741
Daniel Dunbaraf05bb92008-08-26 08:29:31 +00001742 case Decl::ObjCImplementation: {
1743 ObjCImplementationDecl *OMD = cast<ObjCImplementationDecl>(D);
1744 EmitObjCPropertyImplementations(OMD);
1745 Runtime->GenerateClass(OMD);
Daniel Dunbar41071de2008-08-15 23:26:23 +00001746 break;
Mike Stump1eb44332009-09-09 15:08:12 +00001747 }
Daniel Dunbar41071de2008-08-15 23:26:23 +00001748 case Decl::ObjCMethod: {
1749 ObjCMethodDecl *OMD = cast<ObjCMethodDecl>(D);
1750 // If this is not a prototype, emit the body.
Argyrios Kyrtzidis6fb0aee2009-06-30 02:35:26 +00001751 if (OMD->getBody())
Daniel Dunbar41071de2008-08-15 23:26:23 +00001752 CodeGenFunction(*this).GenerateObjCMethod(OMD);
1753 break;
1754 }
Mike Stump1eb44332009-09-09 15:08:12 +00001755 case Decl::ObjCCompatibleAlias:
Fariborz Jahanian305c6582009-01-08 01:10:55 +00001756 // compatibility-alias is a directive and has no code gen.
Daniel Dunbar41071de2008-08-15 23:26:23 +00001757 break;
1758
Anders Carlsson91e20dd2009-04-02 05:55:18 +00001759 case Decl::LinkageSpec:
1760 EmitLinkageSpec(cast<LinkageSpecDecl>(D));
Daniel Dunbar41071de2008-08-15 23:26:23 +00001761 break;
Daniel Dunbar41071de2008-08-15 23:26:23 +00001762
1763 case Decl::FileScopeAsm: {
1764 FileScopeAsmDecl *AD = cast<FileScopeAsmDecl>(D);
Benjamin Kramer8d042582009-12-11 13:33:18 +00001765 llvm::StringRef AsmString = AD->getAsmString()->getString();
Mike Stump1eb44332009-09-09 15:08:12 +00001766
Daniel Dunbar41071de2008-08-15 23:26:23 +00001767 const std::string &S = getModule().getModuleInlineAsm();
1768 if (S.empty())
1769 getModule().setModuleInlineAsm(AsmString);
1770 else
Benjamin Kramer8d042582009-12-11 13:33:18 +00001771 getModule().setModuleInlineAsm(S + '\n' + AsmString.str());
Daniel Dunbar41071de2008-08-15 23:26:23 +00001772 break;
1773 }
Mike Stump1eb44332009-09-09 15:08:12 +00001774
1775 default:
Mike Stumpf5408fe2009-05-16 07:57:57 +00001776 // Make sure we handled everything we should, every other kind is a
1777 // non-top-level decl. FIXME: Would be nice to have an isTopLevelDeclKind
1778 // function. Need to recode Decl::Kind to do that easily.
Daniel Dunbar41071de2008-08-15 23:26:23 +00001779 assert(isa<TypeDecl>(D) && "Unsupported decl kind");
1780 }
1781}