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Reid Spencer5f016e22007-07-11 17:01:13 +00001//===--- CGDecl.cpp - Emit LLVM Code for declarations ---------------------===//
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 contains code to emit Decl nodes as LLVM code.
11//
12//===----------------------------------------------------------------------===//
13
14#include "CodeGenFunction.h"
Chandler Carruth55fc8732012-12-04 09:13:33 +000015#include "CGDebugInfo.h"
Peter Collingbourne8c25fc52011-09-19 21:14:35 +000016#include "CGOpenCLRuntime.h"
Chandler Carruth55fc8732012-12-04 09:13:33 +000017#include "CodeGenModule.h"
Daniel Dunbarde7fb842008-08-11 05:00:27 +000018#include "clang/AST/ASTContext.h"
Ken Dyckbdc601b2009-12-22 14:23:30 +000019#include "clang/AST/CharUnits.h"
Daniel Dunbarc4a1dea2008-08-11 05:35:13 +000020#include "clang/AST/Decl.h"
Anders Carlsson19567ee2008-08-25 01:38:19 +000021#include "clang/AST/DeclObjC.h"
Nate Begeman8bd4afe2008-04-19 04:17:09 +000022#include "clang/Basic/SourceManager.h"
Chris Lattner2621fd12008-05-08 05:58:21 +000023#include "clang/Basic/TargetInfo.h"
Chandler Carruth06057ce2010-06-15 23:19:56 +000024#include "clang/Frontend/CodeGenOptions.h"
Chandler Carruth3b844ba2013-01-02 11:45:17 +000025#include "llvm/IR/DataLayout.h"
26#include "llvm/IR/GlobalVariable.h"
27#include "llvm/IR/Intrinsics.h"
28#include "llvm/IR/Type.h"
Reid Spencer5f016e22007-07-11 17:01:13 +000029using namespace clang;
30using namespace CodeGen;
31
32
33void CodeGenFunction::EmitDecl(const Decl &D) {
Reid Spencer5f016e22007-07-11 17:01:13 +000034 switch (D.getKind()) {
Douglas Gregor08688ac2010-04-23 02:02:43 +000035 case Decl::TranslationUnit:
36 case Decl::Namespace:
37 case Decl::UnresolvedUsingTypename:
38 case Decl::ClassTemplateSpecialization:
39 case Decl::ClassTemplatePartialSpecialization:
40 case Decl::TemplateTypeParm:
41 case Decl::UnresolvedUsingValue:
Sean Hunt9a555912010-05-30 07:21:58 +000042 case Decl::NonTypeTemplateParm:
Douglas Gregor08688ac2010-04-23 02:02:43 +000043 case Decl::CXXMethod:
44 case Decl::CXXConstructor:
45 case Decl::CXXDestructor:
46 case Decl::CXXConversion:
47 case Decl::Field:
Francois Pichet41f5e662010-11-21 06:49:41 +000048 case Decl::IndirectField:
Douglas Gregor08688ac2010-04-23 02:02:43 +000049 case Decl::ObjCIvar:
Eric Christophere1f54902011-08-23 22:38:00 +000050 case Decl::ObjCAtDefsField:
Chris Lattneraa9fc462007-10-08 21:37:32 +000051 case Decl::ParmVar:
Douglas Gregor08688ac2010-04-23 02:02:43 +000052 case Decl::ImplicitParam:
53 case Decl::ClassTemplate:
54 case Decl::FunctionTemplate:
Richard Smith3e4c6c42011-05-05 21:57:07 +000055 case Decl::TypeAliasTemplate:
Douglas Gregor08688ac2010-04-23 02:02:43 +000056 case Decl::TemplateTemplateParm:
57 case Decl::ObjCMethod:
58 case Decl::ObjCCategory:
59 case Decl::ObjCProtocol:
60 case Decl::ObjCInterface:
61 case Decl::ObjCCategoryImpl:
62 case Decl::ObjCImplementation:
63 case Decl::ObjCProperty:
64 case Decl::ObjCCompatibleAlias:
Abramo Bagnara6206d532010-06-05 05:09:32 +000065 case Decl::AccessSpec:
Douglas Gregor08688ac2010-04-23 02:02:43 +000066 case Decl::LinkageSpec:
67 case Decl::ObjCPropertyImpl:
Douglas Gregor08688ac2010-04-23 02:02:43 +000068 case Decl::FileScopeAsm:
69 case Decl::Friend:
70 case Decl::FriendTemplate:
71 case Decl::Block:
Francois Pichetaf0f4d02011-08-14 03:52:19 +000072 case Decl::ClassScopeFunctionSpecialization:
David Blaikieb219cfc2011-09-23 05:06:16 +000073 llvm_unreachable("Declaration should not be in declstmts!");
Reid Spencer5f016e22007-07-11 17:01:13 +000074 case Decl::Function: // void X();
Argyrios Kyrtzidis35bc0822008-10-15 00:42:39 +000075 case Decl::Record: // struct/union/class X;
Reid Spencer5f016e22007-07-11 17:01:13 +000076 case Decl::Enum: // enum X;
Mike Stump1eb44332009-09-09 15:08:12 +000077 case Decl::EnumConstant: // enum ? { X = ? }
Argyrios Kyrtzidis35bc0822008-10-15 00:42:39 +000078 case Decl::CXXRecord: // struct/union/class X; [C++]
Daniel Dunbarfa133a12009-11-23 00:07:06 +000079 case Decl::Using: // using X; [C++]
80 case Decl::UsingShadow:
David Blaikiec8c24272013-02-02 00:39:32 +000081 case Decl::UsingDirective: // using namespace X; [C++]
Douglas Gregor08688ac2010-04-23 02:02:43 +000082 case Decl::NamespaceAlias:
Anders Carlsson7b0ca3f2009-12-03 17:26:31 +000083 case Decl::StaticAssert: // static_assert(X, ""); [C++0x]
Chris Lattner4ae493c2011-02-18 02:08:43 +000084 case Decl::Label: // __label__ x;
Douglas Gregor15de72c2011-12-02 23:23:56 +000085 case Decl::Import:
Michael Han684aa732013-02-22 17:15:32 +000086 case Decl::Empty:
Reid Spencer5f016e22007-07-11 17:01:13 +000087 // None of these decls require codegen support.
88 return;
David Blaikiec8c24272013-02-02 00:39:32 +000089
Daniel Dunbar662174c82008-08-29 17:28:43 +000090 case Decl::Var: {
91 const VarDecl &VD = cast<VarDecl>(D);
John McCallb6bbcc92010-10-15 04:57:14 +000092 assert(VD.isLocalVarDecl() &&
Daniel Dunbar662174c82008-08-29 17:28:43 +000093 "Should not see file-scope variables inside a function!");
John McCallb6bbcc92010-10-15 04:57:14 +000094 return EmitVarDecl(VD);
Reid Spencer5f016e22007-07-11 17:01:13 +000095 }
Mike Stump1eb44332009-09-09 15:08:12 +000096
Richard Smith162e1c12011-04-15 14:24:37 +000097 case Decl::Typedef: // typedef int X;
98 case Decl::TypeAlias: { // using X = int; [C++0x]
99 const TypedefNameDecl &TD = cast<TypedefNameDecl>(D);
Anders Carlssonfcdbb932008-12-20 21:51:53 +0000100 QualType Ty = TD.getUnderlyingType();
Mike Stump1eb44332009-09-09 15:08:12 +0000101
Anders Carlssonfcdbb932008-12-20 21:51:53 +0000102 if (Ty->isVariablyModifiedType())
John McCallbc8d40d2011-06-24 21:55:10 +0000103 EmitVariablyModifiedType(Ty);
Anders Carlssonfcdbb932008-12-20 21:51:53 +0000104 }
Daniel Dunbar662174c82008-08-29 17:28:43 +0000105 }
Reid Spencer5f016e22007-07-11 17:01:13 +0000106}
107
John McCallb6bbcc92010-10-15 04:57:14 +0000108/// EmitVarDecl - This method handles emission of any variable declaration
Reid Spencer5f016e22007-07-11 17:01:13 +0000109/// inside a function, including static vars etc.
John McCallb6bbcc92010-10-15 04:57:14 +0000110void CodeGenFunction::EmitVarDecl(const VarDecl &D) {
Rafael Espindola0db661e2012-12-21 01:21:33 +0000111 switch (D.getStorageClassAsWritten()) {
John McCalld931b082010-08-26 03:08:43 +0000112 case SC_None:
113 case SC_Auto:
114 case SC_Register:
John McCallb6bbcc92010-10-15 04:57:14 +0000115 return EmitAutoVarDecl(D);
John McCalld931b082010-08-26 03:08:43 +0000116 case SC_Static: {
Eric Christophere1f54902011-08-23 22:38:00 +0000117 llvm::GlobalValue::LinkageTypes Linkage =
Anders Carlssonf6b89a12010-02-07 02:03:08 +0000118 llvm::GlobalValue::InternalLinkage;
119
John McCall8b242332010-05-25 04:30:21 +0000120 // If the function definition has some sort of weak linkage, its
121 // static variables should also be weak so that they get properly
122 // uniqued. We can't do this in C, though, because there's no
123 // standard way to agree on which variables are the same (i.e.
124 // there's no mangling).
Richard Smith7edf9e32012-11-01 22:30:59 +0000125 if (getLangOpts().CPlusPlus)
John McCall8b242332010-05-25 04:30:21 +0000126 if (llvm::GlobalValue::isWeakForLinker(CurFn->getLinkage()))
127 Linkage = CurFn->getLinkage();
Eric Christophere1f54902011-08-23 22:38:00 +0000128
John McCallb6bbcc92010-10-15 04:57:14 +0000129 return EmitStaticVarDecl(D, Linkage);
Anders Carlssonf6b89a12010-02-07 02:03:08 +0000130 }
John McCalld931b082010-08-26 03:08:43 +0000131 case SC_Extern:
132 case SC_PrivateExtern:
Lauro Ramos Venanciofea90b82008-02-16 22:30:38 +0000133 // Don't emit it now, allow it to be emitted lazily on its first use.
134 return;
Peter Collingbourne8c25fc52011-09-19 21:14:35 +0000135 case SC_OpenCLWorkGroupLocal:
136 return CGM.getOpenCLRuntime().EmitWorkGroupLocalVarDecl(*this, D);
Reid Spencer5f016e22007-07-11 17:01:13 +0000137 }
Daniel Dunbar5466c7b2009-04-14 02:25:56 +0000138
David Blaikieb219cfc2011-09-23 05:06:16 +0000139 llvm_unreachable("Unknown storage class");
Reid Spencer5f016e22007-07-11 17:01:13 +0000140}
141
Chris Lattner761acc12009-12-05 08:22:11 +0000142static std::string GetStaticDeclName(CodeGenFunction &CGF, const VarDecl &D,
143 const char *Separator) {
144 CodeGenModule &CGM = CGF.CGM;
Richard Smith7edf9e32012-11-01 22:30:59 +0000145 if (CGF.getLangOpts().CPlusPlus) {
Chris Lattner5f9e2722011-07-23 10:55:15 +0000146 StringRef Name = CGM.getMangledName(&D);
Anders Carlsson9a20d552010-06-22 16:16:50 +0000147 return Name.str();
John McCallf746aa62010-03-19 23:29:14 +0000148 }
Eric Christophere1f54902011-08-23 22:38:00 +0000149
Chris Lattner761acc12009-12-05 08:22:11 +0000150 std::string ContextName;
Fariborz Jahanianfaa5bfc2010-11-30 23:07:14 +0000151 if (!CGF.CurFuncDecl) {
152 // Better be in a block declared in global scope.
153 const NamedDecl *ND = cast<NamedDecl>(&D);
154 const DeclContext *DC = ND->getDeclContext();
155 if (const BlockDecl *BD = dyn_cast<BlockDecl>(DC)) {
156 MangleBuffer Name;
Peter Collingbourne14110472011-01-13 18:57:25 +0000157 CGM.getBlockMangledName(GlobalDecl(), Name, BD);
Fariborz Jahanianfaa5bfc2010-11-30 23:07:14 +0000158 ContextName = Name.getString();
159 }
160 else
David Blaikieb219cfc2011-09-23 05:06:16 +0000161 llvm_unreachable("Unknown context for block static var decl");
Fariborz Jahanianfaa5bfc2010-11-30 23:07:14 +0000162 } else if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(CGF.CurFuncDecl)) {
Chris Lattner5f9e2722011-07-23 10:55:15 +0000163 StringRef Name = CGM.getMangledName(FD);
Anders Carlsson9a20d552010-06-22 16:16:50 +0000164 ContextName = Name.str();
John McCallf746aa62010-03-19 23:29:14 +0000165 } else if (isa<ObjCMethodDecl>(CGF.CurFuncDecl))
Chris Lattner761acc12009-12-05 08:22:11 +0000166 ContextName = CGF.CurFn->getName();
167 else
David Blaikieb219cfc2011-09-23 05:06:16 +0000168 llvm_unreachable("Unknown context for static var decl");
Eric Christophere1f54902011-08-23 22:38:00 +0000169
Chris Lattner761acc12009-12-05 08:22:11 +0000170 return ContextName + Separator + D.getNameAsString();
171}
172
Chandler Carruth0f30a122012-03-30 19:44:53 +0000173llvm::GlobalVariable *
John McCallb6bbcc92010-10-15 04:57:14 +0000174CodeGenFunction::CreateStaticVarDecl(const VarDecl &D,
175 const char *Separator,
176 llvm::GlobalValue::LinkageTypes Linkage) {
Chris Lattner8bcfc5b2008-04-06 23:10:54 +0000177 QualType Ty = D.getType();
Eli Friedman3c2b3172008-02-15 12:20:59 +0000178 assert(Ty->isConstantSizeType() && "VLAs can't be static");
Nate Begeman8bd4afe2008-04-19 04:17:09 +0000179
Benjamin Kramer5c247db2011-11-20 21:05:04 +0000180 // Use the label if the variable is renamed with the asm-label extension.
181 std::string Name;
Benjamin Kramerc3c8f222011-11-21 15:47:23 +0000182 if (D.hasAttr<AsmLabelAttr>())
183 Name = CGM.getMangledName(&D);
184 else
Benjamin Kramer5c247db2011-11-20 21:05:04 +0000185 Name = GetStaticDeclName(*this, D, Separator);
Nate Begeman8bd4afe2008-04-19 04:17:09 +0000186
Chris Lattner2acc6e32011-07-18 04:24:23 +0000187 llvm::Type *LTy = CGM.getTypes().ConvertTypeForMem(Ty);
Peter Collingbourne1aba7782012-08-28 20:37:10 +0000188 unsigned AddrSpace =
189 CGM.GetGlobalVarAddressSpace(&D, CGM.getContext().getTargetAddressSpace(Ty));
Anders Carlsson41f8a132009-09-26 18:16:06 +0000190 llvm::GlobalVariable *GV =
191 new llvm::GlobalVariable(CGM.getModule(), LTy,
192 Ty.isConstant(getContext()), Linkage,
Hans Wennborgde981f32012-06-28 08:01:44 +0000193 CGM.EmitNullConstant(D.getType()), Name, 0,
194 llvm::GlobalVariable::NotThreadLocal,
Peter Collingbourne1aba7782012-08-28 20:37:10 +0000195 AddrSpace);
Ken Dyck8b752f12010-01-27 17:10:57 +0000196 GV->setAlignment(getContext().getDeclAlign(&D).getQuantity());
John McCall112c9672010-11-02 21:04:24 +0000197 if (Linkage != llvm::GlobalValue::InternalLinkage)
198 GV->setVisibility(CurFn->getVisibility());
Hans Wennborgde981f32012-06-28 08:01:44 +0000199
200 if (D.isThreadSpecified())
201 CGM.setTLSMode(GV, D);
202
Anders Carlsson41f8a132009-09-26 18:16:06 +0000203 return GV;
Daniel Dunbar0096acf2009-02-25 19:24:29 +0000204}
205
Richard Smith7ca48502012-02-13 22:16:19 +0000206/// hasNontrivialDestruction - Determine whether a type's destruction is
207/// non-trivial. If so, and the variable uses static initialization, we must
208/// register its destructor to run on exit.
209static bool hasNontrivialDestruction(QualType T) {
210 CXXRecordDecl *RD = T->getBaseElementTypeUnsafe()->getAsCXXRecordDecl();
211 return RD && !RD->hasTrivialDestructor();
212}
213
Chandler Carruth0f30a122012-03-30 19:44:53 +0000214/// AddInitializerToStaticVarDecl - Add the initializer for 'D' to the
215/// global variable that has already been created for it. If the initializer
216/// has a different type than GV does, this may free GV and return a different
217/// one. Otherwise it just returns GV.
218llvm::GlobalVariable *
John McCallb6bbcc92010-10-15 04:57:14 +0000219CodeGenFunction::AddInitializerToStaticVarDecl(const VarDecl &D,
Chandler Carruth0f30a122012-03-30 19:44:53 +0000220 llvm::GlobalVariable *GV) {
221 llvm::Constant *Init = CGM.EmitConstantInit(D, this);
John McCallbf40cb52010-07-15 23:40:35 +0000222
Chris Lattner761acc12009-12-05 08:22:11 +0000223 // If constant emission failed, then this should be a C++ static
224 // initializer.
Chandler Carruth0f30a122012-03-30 19:44:53 +0000225 if (!Init) {
Richard Smith7edf9e32012-11-01 22:30:59 +0000226 if (!getLangOpts().CPlusPlus)
Chris Lattner761acc12009-12-05 08:22:11 +0000227 CGM.ErrorUnsupported(D.getInit(), "constant l-value expression");
John McCall5cd91b52010-09-08 01:44:27 +0000228 else if (Builder.GetInsertBlock()) {
Eric Christophere1f54902011-08-23 22:38:00 +0000229 // Since we have a static initializer, this global variable can't
Anders Carlsson071c8102010-01-26 04:02:23 +0000230 // be constant.
Chandler Carruth0f30a122012-03-30 19:44:53 +0000231 GV->setConstant(false);
John McCall5cd91b52010-09-08 01:44:27 +0000232
Chandler Carruth0f30a122012-03-30 19:44:53 +0000233 EmitCXXGuardedInit(D, GV, /*PerformInit*/true);
Anders Carlsson071c8102010-01-26 04:02:23 +0000234 }
Chandler Carruth0f30a122012-03-30 19:44:53 +0000235 return GV;
Chris Lattner761acc12009-12-05 08:22:11 +0000236 }
John McCallbf40cb52010-07-15 23:40:35 +0000237
Chris Lattner761acc12009-12-05 08:22:11 +0000238 // The initializer may differ in type from the global. Rewrite
239 // the global to match the initializer. (We have to do this
240 // because some types, like unions, can't be completely represented
241 // in the LLVM type system.)
Chandler Carruth0f30a122012-03-30 19:44:53 +0000242 if (GV->getType()->getElementType() != Init->getType()) {
243 llvm::GlobalVariable *OldGV = GV;
244
245 GV = new llvm::GlobalVariable(CGM.getModule(), Init->getType(),
246 OldGV->isConstant(),
247 OldGV->getLinkage(), Init, "",
248 /*InsertBefore*/ OldGV,
Hans Wennborg5e2d5de2012-06-23 11:51:46 +0000249 OldGV->getThreadLocalMode(),
Chandler Carruth0f30a122012-03-30 19:44:53 +0000250 CGM.getContext().getTargetAddressSpace(D.getType()));
251 GV->setVisibility(OldGV->getVisibility());
Eric Christophere1f54902011-08-23 22:38:00 +0000252
Chris Lattner761acc12009-12-05 08:22:11 +0000253 // Steal the name of the old global
Chandler Carruth0f30a122012-03-30 19:44:53 +0000254 GV->takeName(OldGV);
Eric Christophere1f54902011-08-23 22:38:00 +0000255
Chris Lattner761acc12009-12-05 08:22:11 +0000256 // Replace all uses of the old global with the new global
Chandler Carruth0f30a122012-03-30 19:44:53 +0000257 llvm::Constant *NewPtrForOldDecl =
258 llvm::ConstantExpr::getBitCast(GV, OldGV->getType());
259 OldGV->replaceAllUsesWith(NewPtrForOldDecl);
Eric Christophere1f54902011-08-23 22:38:00 +0000260
Chris Lattner761acc12009-12-05 08:22:11 +0000261 // Erase the old global, since it is no longer used.
Chandler Carruth0f30a122012-03-30 19:44:53 +0000262 OldGV->eraseFromParent();
Chris Lattner761acc12009-12-05 08:22:11 +0000263 }
Eric Christophere1f54902011-08-23 22:38:00 +0000264
Chandler Carruth0f30a122012-03-30 19:44:53 +0000265 GV->setConstant(CGM.isTypeConstant(D.getType(), true));
266 GV->setInitializer(Init);
Richard Smith7ca48502012-02-13 22:16:19 +0000267
268 if (hasNontrivialDestruction(D.getType())) {
269 // We have a constant initializer, but a nontrivial destructor. We still
270 // need to perform a guarded "initialization" in order to register the
Richard Smitha9b21d22012-02-17 06:48:11 +0000271 // destructor.
Chandler Carruth0f30a122012-03-30 19:44:53 +0000272 EmitCXXGuardedInit(D, GV, /*PerformInit*/false);
Richard Smith7ca48502012-02-13 22:16:19 +0000273 }
274
Chandler Carruth0f30a122012-03-30 19:44:53 +0000275 return GV;
Chris Lattner761acc12009-12-05 08:22:11 +0000276}
277
John McCallb6bbcc92010-10-15 04:57:14 +0000278void CodeGenFunction::EmitStaticVarDecl(const VarDecl &D,
Anders Carlssonf6b89a12010-02-07 02:03:08 +0000279 llvm::GlobalValue::LinkageTypes Linkage) {
Chandler Carruth0f30a122012-03-30 19:44:53 +0000280 llvm::Value *&DMEntry = LocalDeclMap[&D];
281 assert(DMEntry == 0 && "Decl already exists in localdeclmap!");
Mike Stump1eb44332009-09-09 15:08:12 +0000282
John McCall355bba72012-03-30 21:00:39 +0000283 // Check to see if we already have a global variable for this
284 // declaration. This can happen when double-emitting function
285 // bodies, e.g. with complete and base constructors.
286 llvm::Constant *addr =
287 CGM.getStaticLocalDeclAddress(&D);
288
289 llvm::GlobalVariable *var;
290 if (addr) {
291 var = cast<llvm::GlobalVariable>(addr->stripPointerCasts());
292 } else {
293 addr = var = CreateStaticVarDecl(D, ".", Linkage);
294 }
Daniel Dunbara985b312009-02-25 19:45:19 +0000295
Daniel Dunbare5731f82009-02-25 20:08:33 +0000296 // Store into LocalDeclMap before generating initializer to handle
297 // circular references.
John McCall355bba72012-03-30 21:00:39 +0000298 DMEntry = addr;
299 CGM.setStaticLocalDeclAddress(&D, addr);
Daniel Dunbare5731f82009-02-25 20:08:33 +0000300
John McCallfe67f3b2010-05-04 20:45:42 +0000301 // We can't have a VLA here, but we can have a pointer to a VLA,
302 // even though that doesn't really make any sense.
Eli Friedmanc62aad82009-04-20 03:54:15 +0000303 // Make sure to evaluate VLA bounds now so that we have them for later.
304 if (D.getType()->isVariablyModifiedType())
John McCallbc8d40d2011-06-24 21:55:10 +0000305 EmitVariablyModifiedType(D.getType());
Eric Christophere1f54902011-08-23 22:38:00 +0000306
John McCall355bba72012-03-30 21:00:39 +0000307 // Save the type in case adding the initializer forces a type change.
308 llvm::Type *expectedType = addr->getType();
Eli Friedmanc62aad82009-04-20 03:54:15 +0000309
Chris Lattner761acc12009-12-05 08:22:11 +0000310 // If this value has an initializer, emit it.
311 if (D.getInit())
John McCall355bba72012-03-30 21:00:39 +0000312 var = AddInitializerToStaticVarDecl(D, var);
Nate Begeman8bd4afe2008-04-19 04:17:09 +0000313
John McCall355bba72012-03-30 21:00:39 +0000314 var->setAlignment(getContext().getDeclAlign(&D).getQuantity());
Chris Lattner0af95232010-03-10 23:59:59 +0000315
Julien Lerouge77f68bb2011-09-09 22:41:49 +0000316 if (D.hasAttr<AnnotateAttr>())
John McCall355bba72012-03-30 21:00:39 +0000317 CGM.AddGlobalAnnotations(&D, var);
Nate Begeman8bd4afe2008-04-19 04:17:09 +0000318
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +0000319 if (const SectionAttr *SA = D.getAttr<SectionAttr>())
John McCall355bba72012-03-30 21:00:39 +0000320 var->setSection(SA->getName());
Mike Stump1eb44332009-09-09 15:08:12 +0000321
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +0000322 if (D.hasAttr<UsedAttr>())
John McCall355bba72012-03-30 21:00:39 +0000323 CGM.AddUsedGlobal(var);
Daniel Dunbar5c61d972009-02-13 22:08:43 +0000324
Chandler Carruth0f30a122012-03-30 19:44:53 +0000325 // We may have to cast the constant because of the initializer
326 // mismatch above.
327 //
328 // FIXME: It is really dangerous to store this in the map; if anyone
329 // RAUW's the GV uses of this constant will be invalid.
John McCall355bba72012-03-30 21:00:39 +0000330 llvm::Constant *castedAddr = llvm::ConstantExpr::getBitCast(var, expectedType);
331 DMEntry = castedAddr;
332 CGM.setStaticLocalDeclAddress(&D, castedAddr);
Sanjiv Gupta686226b2008-06-05 08:59:10 +0000333
334 // Emit global variable debug descriptor for static vars.
Anders Carlssone896d982009-02-13 08:11:52 +0000335 CGDebugInfo *DI = getDebugInfo();
Alexey Samsonovfd00eec2012-05-04 07:39:27 +0000336 if (DI &&
Douglas Gregor4cdad312012-10-23 20:05:01 +0000337 CGM.getCodeGenOpts().getDebugInfo() >= CodeGenOptions::LimitedDebugInfo) {
Daniel Dunbar66031a52008-10-17 16:15:48 +0000338 DI->setLocation(D.getLocation());
John McCall355bba72012-03-30 21:00:39 +0000339 DI->EmitGlobalVariable(var, &D);
Sanjiv Gupta686226b2008-06-05 08:59:10 +0000340 }
Anders Carlsson1a86b332007-10-17 00:52:43 +0000341}
Mike Stump1eb44332009-09-09 15:08:12 +0000342
John McCallda65ea82010-07-13 20:32:21 +0000343namespace {
John McCallbdc4d802011-07-09 01:37:26 +0000344 struct DestroyObject : EHScopeStack::Cleanup {
345 DestroyObject(llvm::Value *addr, QualType type,
John McCall2673c682011-07-11 08:38:19 +0000346 CodeGenFunction::Destroyer *destroyer,
347 bool useEHCleanupForArray)
Peter Collingbourne516bbd42012-01-26 03:33:36 +0000348 : addr(addr), type(type), destroyer(destroyer),
John McCall2673c682011-07-11 08:38:19 +0000349 useEHCleanupForArray(useEHCleanupForArray) {}
John McCallda65ea82010-07-13 20:32:21 +0000350
John McCallbdc4d802011-07-09 01:37:26 +0000351 llvm::Value *addr;
352 QualType type;
Peter Collingbourne516bbd42012-01-26 03:33:36 +0000353 CodeGenFunction::Destroyer *destroyer;
John McCall2673c682011-07-11 08:38:19 +0000354 bool useEHCleanupForArray;
John McCallda65ea82010-07-13 20:32:21 +0000355
John McCallad346f42011-07-12 20:27:29 +0000356 void Emit(CodeGenFunction &CGF, Flags flags) {
John McCall2673c682011-07-11 08:38:19 +0000357 // Don't use an EH cleanup recursively from an EH cleanup.
John McCallad346f42011-07-12 20:27:29 +0000358 bool useEHCleanupForArray =
359 flags.isForNormalCleanup() && this->useEHCleanupForArray;
John McCall2673c682011-07-11 08:38:19 +0000360
361 CGF.emitDestroy(addr, type, destroyer, useEHCleanupForArray);
John McCallda65ea82010-07-13 20:32:21 +0000362 }
363 };
364
John McCallbdc4d802011-07-09 01:37:26 +0000365 struct DestroyNRVOVariable : EHScopeStack::Cleanup {
366 DestroyNRVOVariable(llvm::Value *addr,
367 const CXXDestructorDecl *Dtor,
368 llvm::Value *NRVOFlag)
369 : Dtor(Dtor), NRVOFlag(NRVOFlag), Loc(addr) {}
John McCallda65ea82010-07-13 20:32:21 +0000370
371 const CXXDestructorDecl *Dtor;
372 llvm::Value *NRVOFlag;
373 llvm::Value *Loc;
374
John McCallad346f42011-07-12 20:27:29 +0000375 void Emit(CodeGenFunction &CGF, Flags flags) {
John McCallda65ea82010-07-13 20:32:21 +0000376 // Along the exceptions path we always execute the dtor.
John McCallad346f42011-07-12 20:27:29 +0000377 bool NRVO = flags.isForNormalCleanup() && NRVOFlag;
John McCallda65ea82010-07-13 20:32:21 +0000378
379 llvm::BasicBlock *SkipDtorBB = 0;
380 if (NRVO) {
381 // If we exited via NRVO, we skip the destructor call.
382 llvm::BasicBlock *RunDtorBB = CGF.createBasicBlock("nrvo.unused");
383 SkipDtorBB = CGF.createBasicBlock("nrvo.skipdtor");
384 llvm::Value *DidNRVO = CGF.Builder.CreateLoad(NRVOFlag, "nrvo.val");
385 CGF.Builder.CreateCondBr(DidNRVO, SkipDtorBB, RunDtorBB);
386 CGF.EmitBlock(RunDtorBB);
387 }
Eric Christophere1f54902011-08-23 22:38:00 +0000388
John McCallda65ea82010-07-13 20:32:21 +0000389 CGF.EmitCXXDestructorCall(Dtor, Dtor_Complete,
Douglas Gregor378e1e72013-01-31 05:50:40 +0000390 /*ForVirtualBase=*/false,
391 /*Delegating=*/false,
392 Loc);
John McCallda65ea82010-07-13 20:32:21 +0000393
394 if (NRVO) CGF.EmitBlock(SkipDtorBB);
395 }
396 };
John McCallda65ea82010-07-13 20:32:21 +0000397
John McCall1f0fca52010-07-21 07:22:38 +0000398 struct CallStackRestore : EHScopeStack::Cleanup {
John McCalld8715092010-07-21 06:13:08 +0000399 llvm::Value *Stack;
400 CallStackRestore(llvm::Value *Stack) : Stack(Stack) {}
John McCallad346f42011-07-12 20:27:29 +0000401 void Emit(CodeGenFunction &CGF, Flags flags) {
Benjamin Kramer578faa82011-09-27 21:06:10 +0000402 llvm::Value *V = CGF.Builder.CreateLoad(Stack);
John McCalld8715092010-07-21 06:13:08 +0000403 llvm::Value *F = CGF.CGM.getIntrinsic(llvm::Intrinsic::stackrestore);
404 CGF.Builder.CreateCall(F, V);
405 }
406 };
407
John McCall0c24c802011-06-24 23:21:27 +0000408 struct ExtendGCLifetime : EHScopeStack::Cleanup {
409 const VarDecl &Var;
410 ExtendGCLifetime(const VarDecl *var) : Var(*var) {}
411
John McCallad346f42011-07-12 20:27:29 +0000412 void Emit(CodeGenFunction &CGF, Flags flags) {
John McCall0c24c802011-06-24 23:21:27 +0000413 // Compute the address of the local variable, in case it's a
414 // byref or something.
John McCallf4b88a42012-03-10 09:33:50 +0000415 DeclRefExpr DRE(const_cast<VarDecl*>(&Var), false,
416 Var.getType(), VK_LValue, SourceLocation());
John McCall0c24c802011-06-24 23:21:27 +0000417 llvm::Value *value = CGF.EmitLoadOfScalar(CGF.EmitDeclRefLValue(&DRE));
418 CGF.EmitExtendGCLifetime(value);
419 }
420 };
421
John McCall1f0fca52010-07-21 07:22:38 +0000422 struct CallCleanupFunction : EHScopeStack::Cleanup {
John McCalld8715092010-07-21 06:13:08 +0000423 llvm::Constant *CleanupFn;
424 const CGFunctionInfo &FnInfo;
John McCalld8715092010-07-21 06:13:08 +0000425 const VarDecl &Var;
Eric Christophere1f54902011-08-23 22:38:00 +0000426
John McCalld8715092010-07-21 06:13:08 +0000427 CallCleanupFunction(llvm::Constant *CleanupFn, const CGFunctionInfo *Info,
John McCall34695852011-02-22 06:44:22 +0000428 const VarDecl *Var)
429 : CleanupFn(CleanupFn), FnInfo(*Info), Var(*Var) {}
John McCalld8715092010-07-21 06:13:08 +0000430
John McCallad346f42011-07-12 20:27:29 +0000431 void Emit(CodeGenFunction &CGF, Flags flags) {
John McCallf4b88a42012-03-10 09:33:50 +0000432 DeclRefExpr DRE(const_cast<VarDecl*>(&Var), false,
433 Var.getType(), VK_LValue, SourceLocation());
John McCall34695852011-02-22 06:44:22 +0000434 // Compute the address of the local variable, in case it's a byref
435 // or something.
436 llvm::Value *Addr = CGF.EmitDeclRefLValue(&DRE).getAddress();
437
John McCalld8715092010-07-21 06:13:08 +0000438 // In some cases, the type of the function argument will be different from
439 // the type of the pointer. An example of this is
440 // void f(void* arg);
441 // __attribute__((cleanup(f))) void *g;
442 //
443 // To fix this we insert a bitcast here.
444 QualType ArgTy = FnInfo.arg_begin()->type;
445 llvm::Value *Arg =
446 CGF.Builder.CreateBitCast(Addr, CGF.ConvertType(ArgTy));
447
448 CallArgList Args;
Eli Friedman04c9a492011-05-02 17:57:46 +0000449 Args.add(RValue::get(Arg),
450 CGF.getContext().getPointerType(Var.getType()));
John McCalld8715092010-07-21 06:13:08 +0000451 CGF.EmitCall(FnInfo, CleanupFn, ReturnValueSlot(), Args);
452 }
453 };
John McCalld8715092010-07-21 06:13:08 +0000454}
455
John McCallf85e1932011-06-15 23:02:42 +0000456/// EmitAutoVarWithLifetime - Does the setup required for an automatic
457/// variable with lifetime.
458static void EmitAutoVarWithLifetime(CodeGenFunction &CGF, const VarDecl &var,
459 llvm::Value *addr,
460 Qualifiers::ObjCLifetime lifetime) {
461 switch (lifetime) {
462 case Qualifiers::OCL_None:
463 llvm_unreachable("present but none");
464
465 case Qualifiers::OCL_ExplicitNone:
466 // nothing to do
467 break;
468
469 case Qualifiers::OCL_Strong: {
Peter Collingbourne516bbd42012-01-26 03:33:36 +0000470 CodeGenFunction::Destroyer *destroyer =
John McCall9928c482011-07-12 16:41:08 +0000471 (var.hasAttr<ObjCPreciseLifetimeAttr>()
472 ? CodeGenFunction::destroyARCStrongPrecise
473 : CodeGenFunction::destroyARCStrongImprecise);
474
475 CleanupKind cleanupKind = CGF.getARCCleanupKind();
476 CGF.pushDestroy(cleanupKind, addr, var.getType(), destroyer,
477 cleanupKind & EHCleanup);
John McCallf85e1932011-06-15 23:02:42 +0000478 break;
479 }
480 case Qualifiers::OCL_Autoreleasing:
481 // nothing to do
482 break;
Eric Christophere1f54902011-08-23 22:38:00 +0000483
John McCallf85e1932011-06-15 23:02:42 +0000484 case Qualifiers::OCL_Weak:
485 // __weak objects always get EH cleanups; otherwise, exceptions
486 // could cause really nasty crashes instead of mere leaks.
John McCall9928c482011-07-12 16:41:08 +0000487 CGF.pushDestroy(NormalAndEHCleanup, addr, var.getType(),
488 CodeGenFunction::destroyARCWeak,
489 /*useEHCleanup*/ true);
John McCallf85e1932011-06-15 23:02:42 +0000490 break;
491 }
492}
493
494static bool isAccessedBy(const VarDecl &var, const Stmt *s) {
495 if (const Expr *e = dyn_cast<Expr>(s)) {
496 // Skip the most common kinds of expressions that make
497 // hierarchy-walking expensive.
498 s = e = e->IgnoreParenCasts();
499
500 if (const DeclRefExpr *ref = dyn_cast<DeclRefExpr>(e))
501 return (ref->getDecl() == &var);
Fariborz Jahanianddfc8a12012-06-19 20:53:26 +0000502 if (const BlockExpr *be = dyn_cast<BlockExpr>(e)) {
503 const BlockDecl *block = be->getBlockDecl();
504 for (BlockDecl::capture_const_iterator i = block->capture_begin(),
505 e = block->capture_end(); i != e; ++i) {
506 if (i->getVariable() == &var)
507 return true;
508 }
509 }
John McCallf85e1932011-06-15 23:02:42 +0000510 }
511
512 for (Stmt::const_child_range children = s->children(); children; ++children)
Fariborz Jahanian8fefc8e2011-06-29 20:00:16 +0000513 // children might be null; as in missing decl or conditional of an if-stmt.
514 if ((*children) && isAccessedBy(var, *children))
John McCallf85e1932011-06-15 23:02:42 +0000515 return true;
516
517 return false;
518}
519
520static bool isAccessedBy(const ValueDecl *decl, const Expr *e) {
521 if (!decl) return false;
522 if (!isa<VarDecl>(decl)) return false;
523 const VarDecl *var = cast<VarDecl>(decl);
524 return isAccessedBy(*var, e);
525}
526
John McCalla07398e2011-06-16 04:16:24 +0000527static void drillIntoBlockVariable(CodeGenFunction &CGF,
528 LValue &lvalue,
529 const VarDecl *var) {
530 lvalue.setAddress(CGF.BuildBlockByrefAddress(lvalue.getAddress(), var));
531}
532
John McCallf85e1932011-06-15 23:02:42 +0000533void CodeGenFunction::EmitScalarInit(const Expr *init,
534 const ValueDecl *D,
John McCalla07398e2011-06-16 04:16:24 +0000535 LValue lvalue,
536 bool capturedByInit) {
John McCalla07398e2011-06-16 04:16:24 +0000537 Qualifiers::ObjCLifetime lifetime = lvalue.getObjCLifetime();
John McCallf85e1932011-06-15 23:02:42 +0000538 if (!lifetime) {
539 llvm::Value *value = EmitScalarExpr(init);
John McCalla07398e2011-06-16 04:16:24 +0000540 if (capturedByInit)
541 drillIntoBlockVariable(*this, lvalue, cast<VarDecl>(D));
David Chisnall7a7ee302012-01-16 17:27:18 +0000542 EmitStoreThroughLValue(RValue::get(value), lvalue, true);
John McCallf85e1932011-06-15 23:02:42 +0000543 return;
544 }
545
546 // If we're emitting a value with lifetime, we have to do the
547 // initialization *before* we leave the cleanup scopes.
John McCall1a343eb2011-11-10 08:15:53 +0000548 if (const ExprWithCleanups *ewc = dyn_cast<ExprWithCleanups>(init)) {
549 enterFullExpression(ewc);
John McCallf85e1932011-06-15 23:02:42 +0000550 init = ewc->getSubExpr();
John McCall1a343eb2011-11-10 08:15:53 +0000551 }
552 CodeGenFunction::RunCleanupsScope Scope(*this);
John McCallf85e1932011-06-15 23:02:42 +0000553
554 // We have to maintain the illusion that the variable is
555 // zero-initialized. If the variable might be accessed in its
556 // initializer, zero-initialize before running the initializer, then
557 // actually perform the initialization with an assign.
558 bool accessedByInit = false;
559 if (lifetime != Qualifiers::OCL_ExplicitNone)
John McCallfb720812011-07-28 07:23:35 +0000560 accessedByInit = (capturedByInit || isAccessedBy(D, init));
John McCallf85e1932011-06-15 23:02:42 +0000561 if (accessedByInit) {
John McCalla07398e2011-06-16 04:16:24 +0000562 LValue tempLV = lvalue;
John McCallf85e1932011-06-15 23:02:42 +0000563 // Drill down to the __block object if necessary.
John McCallf85e1932011-06-15 23:02:42 +0000564 if (capturedByInit) {
565 // We can use a simple GEP for this because it can't have been
566 // moved yet.
John McCalla07398e2011-06-16 04:16:24 +0000567 tempLV.setAddress(Builder.CreateStructGEP(tempLV.getAddress(),
568 getByRefValueLLVMField(cast<VarDecl>(D))));
John McCallf85e1932011-06-15 23:02:42 +0000569 }
570
Chris Lattner2acc6e32011-07-18 04:24:23 +0000571 llvm::PointerType *ty
John McCalla07398e2011-06-16 04:16:24 +0000572 = cast<llvm::PointerType>(tempLV.getAddress()->getType());
John McCallf85e1932011-06-15 23:02:42 +0000573 ty = cast<llvm::PointerType>(ty->getElementType());
574
575 llvm::Value *zero = llvm::ConstantPointerNull::get(ty);
Eric Christophere1f54902011-08-23 22:38:00 +0000576
John McCallf85e1932011-06-15 23:02:42 +0000577 // If __weak, we want to use a barrier under certain conditions.
578 if (lifetime == Qualifiers::OCL_Weak)
John McCalla07398e2011-06-16 04:16:24 +0000579 EmitARCInitWeak(tempLV.getAddress(), zero);
John McCallf85e1932011-06-15 23:02:42 +0000580
581 // Otherwise just do a simple store.
582 else
David Chisnall7a7ee302012-01-16 17:27:18 +0000583 EmitStoreOfScalar(zero, tempLV, /* isInitialization */ true);
John McCallf85e1932011-06-15 23:02:42 +0000584 }
585
586 // Emit the initializer.
587 llvm::Value *value = 0;
588
589 switch (lifetime) {
590 case Qualifiers::OCL_None:
591 llvm_unreachable("present but none");
592
593 case Qualifiers::OCL_ExplicitNone:
594 // nothing to do
595 value = EmitScalarExpr(init);
596 break;
597
598 case Qualifiers::OCL_Strong: {
599 value = EmitARCRetainScalarExpr(init);
600 break;
601 }
602
603 case Qualifiers::OCL_Weak: {
604 // No way to optimize a producing initializer into this. It's not
605 // worth optimizing for, because the value will immediately
606 // disappear in the common case.
607 value = EmitScalarExpr(init);
608
John McCalla07398e2011-06-16 04:16:24 +0000609 if (capturedByInit) drillIntoBlockVariable(*this, lvalue, cast<VarDecl>(D));
John McCallf85e1932011-06-15 23:02:42 +0000610 if (accessedByInit)
John McCalla07398e2011-06-16 04:16:24 +0000611 EmitARCStoreWeak(lvalue.getAddress(), value, /*ignored*/ true);
John McCallf85e1932011-06-15 23:02:42 +0000612 else
John McCalla07398e2011-06-16 04:16:24 +0000613 EmitARCInitWeak(lvalue.getAddress(), value);
John McCallf85e1932011-06-15 23:02:42 +0000614 return;
615 }
616
617 case Qualifiers::OCL_Autoreleasing:
618 value = EmitARCRetainAutoreleaseScalarExpr(init);
619 break;
620 }
621
John McCalla07398e2011-06-16 04:16:24 +0000622 if (capturedByInit) drillIntoBlockVariable(*this, lvalue, cast<VarDecl>(D));
John McCallf85e1932011-06-15 23:02:42 +0000623
624 // If the variable might have been accessed by its initializer, we
625 // might have to initialize with a barrier. We have to do this for
626 // both __weak and __strong, but __weak got filtered out above.
627 if (accessedByInit && lifetime == Qualifiers::OCL_Strong) {
John McCalla07398e2011-06-16 04:16:24 +0000628 llvm::Value *oldValue = EmitLoadOfScalar(lvalue);
David Chisnall7a7ee302012-01-16 17:27:18 +0000629 EmitStoreOfScalar(value, lvalue, /* isInitialization */ true);
John McCallf85e1932011-06-15 23:02:42 +0000630 EmitARCRelease(oldValue, /*precise*/ false);
631 return;
632 }
633
David Chisnall7a7ee302012-01-16 17:27:18 +0000634 EmitStoreOfScalar(value, lvalue, /* isInitialization */ true);
John McCallf85e1932011-06-15 23:02:42 +0000635}
Chris Lattner94cd0112010-12-01 02:05:19 +0000636
John McCall7acddac2011-06-17 06:42:21 +0000637/// EmitScalarInit - Initialize the given lvalue with the given object.
638void CodeGenFunction::EmitScalarInit(llvm::Value *init, LValue lvalue) {
639 Qualifiers::ObjCLifetime lifetime = lvalue.getObjCLifetime();
640 if (!lifetime)
David Chisnall7a7ee302012-01-16 17:27:18 +0000641 return EmitStoreThroughLValue(RValue::get(init), lvalue, true);
John McCall7acddac2011-06-17 06:42:21 +0000642
643 switch (lifetime) {
644 case Qualifiers::OCL_None:
645 llvm_unreachable("present but none");
646
647 case Qualifiers::OCL_ExplicitNone:
648 // nothing to do
649 break;
650
651 case Qualifiers::OCL_Strong:
652 init = EmitARCRetain(lvalue.getType(), init);
653 break;
654
655 case Qualifiers::OCL_Weak:
656 // Initialize and then skip the primitive store.
657 EmitARCInitWeak(lvalue.getAddress(), init);
658 return;
659
660 case Qualifiers::OCL_Autoreleasing:
661 init = EmitARCRetainAutorelease(lvalue.getType(), init);
662 break;
663 }
664
David Chisnall7a7ee302012-01-16 17:27:18 +0000665 EmitStoreOfScalar(init, lvalue, /* isInitialization */ true);
John McCall7acddac2011-06-17 06:42:21 +0000666}
667
Chris Lattner94cd0112010-12-01 02:05:19 +0000668/// canEmitInitWithFewStoresAfterMemset - Decide whether we can emit the
669/// non-zero parts of the specified initializer with equal or fewer than
670/// NumStores scalar stores.
671static bool canEmitInitWithFewStoresAfterMemset(llvm::Constant *Init,
672 unsigned &NumStores) {
Chris Lattner70b02942010-12-02 01:58:41 +0000673 // Zero and Undef never requires any extra stores.
674 if (isa<llvm::ConstantAggregateZero>(Init) ||
675 isa<llvm::ConstantPointerNull>(Init) ||
676 isa<llvm::UndefValue>(Init))
677 return true;
678 if (isa<llvm::ConstantInt>(Init) || isa<llvm::ConstantFP>(Init) ||
679 isa<llvm::ConstantVector>(Init) || isa<llvm::BlockAddress>(Init) ||
680 isa<llvm::ConstantExpr>(Init))
681 return Init->isNullValue() || NumStores--;
682
683 // See if we can emit each element.
684 if (isa<llvm::ConstantArray>(Init) || isa<llvm::ConstantStruct>(Init)) {
685 for (unsigned i = 0, e = Init->getNumOperands(); i != e; ++i) {
686 llvm::Constant *Elt = cast<llvm::Constant>(Init->getOperand(i));
687 if (!canEmitInitWithFewStoresAfterMemset(Elt, NumStores))
688 return false;
689 }
690 return true;
691 }
Chris Lattnerf492cb12012-01-31 04:36:19 +0000692
693 if (llvm::ConstantDataSequential *CDS =
694 dyn_cast<llvm::ConstantDataSequential>(Init)) {
695 for (unsigned i = 0, e = CDS->getNumElements(); i != e; ++i) {
696 llvm::Constant *Elt = CDS->getElementAsConstant(i);
697 if (!canEmitInitWithFewStoresAfterMemset(Elt, NumStores))
698 return false;
699 }
700 return true;
701 }
Eric Christophere1f54902011-08-23 22:38:00 +0000702
Chris Lattner94cd0112010-12-01 02:05:19 +0000703 // Anything else is hard and scary.
704 return false;
705}
706
707/// emitStoresForInitAfterMemset - For inits that
708/// canEmitInitWithFewStoresAfterMemset returned true for, emit the scalar
709/// stores that would be required.
710static void emitStoresForInitAfterMemset(llvm::Constant *Init, llvm::Value *Loc,
John McCall34695852011-02-22 06:44:22 +0000711 bool isVolatile, CGBuilderTy &Builder) {
Benjamin Kramer06d43682012-08-27 22:07:02 +0000712 assert(!Init->isNullValue() && !isa<llvm::UndefValue>(Init) &&
713 "called emitStoresForInitAfterMemset for zero or undef value.");
Eric Christophere1f54902011-08-23 22:38:00 +0000714
Chris Lattner70b02942010-12-02 01:58:41 +0000715 if (isa<llvm::ConstantInt>(Init) || isa<llvm::ConstantFP>(Init) ||
716 isa<llvm::ConstantVector>(Init) || isa<llvm::BlockAddress>(Init) ||
717 isa<llvm::ConstantExpr>(Init)) {
Chris Lattnerf492cb12012-01-31 04:36:19 +0000718 Builder.CreateStore(Init, Loc, isVolatile);
719 return;
720 }
721
722 if (llvm::ConstantDataSequential *CDS =
723 dyn_cast<llvm::ConstantDataSequential>(Init)) {
724 for (unsigned i = 0, e = CDS->getNumElements(); i != e; ++i) {
725 llvm::Constant *Elt = CDS->getElementAsConstant(i);
Benjamin Kramercfa07e32012-08-27 21:35:58 +0000726
727 // If necessary, get a pointer to the element and emit it.
728 if (!Elt->isNullValue() && !isa<llvm::UndefValue>(Elt))
729 emitStoresForInitAfterMemset(Elt, Builder.CreateConstGEP2_32(Loc, 0, i),
730 isVolatile, Builder);
Chris Lattnerf492cb12012-01-31 04:36:19 +0000731 }
Chris Lattner70b02942010-12-02 01:58:41 +0000732 return;
733 }
Eric Christophere1f54902011-08-23 22:38:00 +0000734
Chris Lattner70b02942010-12-02 01:58:41 +0000735 assert((isa<llvm::ConstantStruct>(Init) || isa<llvm::ConstantArray>(Init)) &&
736 "Unknown value type!");
Eric Christophere1f54902011-08-23 22:38:00 +0000737
Chris Lattner70b02942010-12-02 01:58:41 +0000738 for (unsigned i = 0, e = Init->getNumOperands(); i != e; ++i) {
739 llvm::Constant *Elt = cast<llvm::Constant>(Init->getOperand(i));
Benjamin Kramercfa07e32012-08-27 21:35:58 +0000740
741 // If necessary, get a pointer to the element and emit it.
742 if (!Elt->isNullValue() && !isa<llvm::UndefValue>(Elt))
743 emitStoresForInitAfterMemset(Elt, Builder.CreateConstGEP2_32(Loc, 0, i),
744 isVolatile, Builder);
Chris Lattner70b02942010-12-02 01:58:41 +0000745 }
Chris Lattner94cd0112010-12-01 02:05:19 +0000746}
747
748
749/// shouldUseMemSetPlusStoresToInitialize - Decide whether we should use memset
750/// plus some stores to initialize a local variable instead of using a memcpy
751/// from a constant global. It is beneficial to use memset if the global is all
752/// zeros, or mostly zeros and large.
753static bool shouldUseMemSetPlusStoresToInitialize(llvm::Constant *Init,
754 uint64_t GlobalSize) {
755 // If a global is all zeros, always use a memset.
756 if (isa<llvm::ConstantAggregateZero>(Init)) return true;
757
758
759 // If a non-zero global is <= 32 bytes, always use a memcpy. If it is large,
760 // do it if it will require 6 or fewer scalar stores.
761 // TODO: Should budget depends on the size? Avoiding a large global warrants
762 // plopping in more stores.
763 unsigned StoreBudget = 6;
764 uint64_t SizeLimit = 32;
Eric Christophere1f54902011-08-23 22:38:00 +0000765
766 return GlobalSize > SizeLimit &&
Chris Lattner94cd0112010-12-01 02:05:19 +0000767 canEmitInitWithFewStoresAfterMemset(Init, StoreBudget);
768}
769
770
Nick Lewyckya9de3fa2010-12-30 20:21:55 +0000771/// EmitAutoVarDecl - Emit code and set up an entry in LocalDeclMap for a
Reid Spencer5f016e22007-07-11 17:01:13 +0000772/// variable declaration with auto, register, or no storage class specifier.
Chris Lattner2621fd12008-05-08 05:58:21 +0000773/// These turn into simple stack objects, or GlobalValues depending on target.
John McCall34695852011-02-22 06:44:22 +0000774void CodeGenFunction::EmitAutoVarDecl(const VarDecl &D) {
775 AutoVarEmission emission = EmitAutoVarAlloca(D);
776 EmitAutoVarInit(emission);
777 EmitAutoVarCleanups(emission);
778}
Reid Spencer5f016e22007-07-11 17:01:13 +0000779
John McCall34695852011-02-22 06:44:22 +0000780/// EmitAutoVarAlloca - Emit the alloca and debug information for a
781/// local variable. Does not emit initalization or destruction.
782CodeGenFunction::AutoVarEmission
783CodeGenFunction::EmitAutoVarAlloca(const VarDecl &D) {
784 QualType Ty = D.getType();
785
786 AutoVarEmission emission(D);
787
788 bool isByRef = D.hasAttr<BlocksAttr>();
789 emission.IsByRef = isByRef;
790
791 CharUnits alignment = getContext().getDeclAlign(&D);
792 emission.Alignment = alignment;
793
John McCallbc8d40d2011-06-24 21:55:10 +0000794 // If the type is variably-modified, emit all the VLA sizes for it.
795 if (Ty->isVariablyModifiedType())
796 EmitVariablyModifiedType(Ty);
797
Reid Spencer5f016e22007-07-11 17:01:13 +0000798 llvm::Value *DeclPtr;
Eli Friedman3c2b3172008-02-15 12:20:59 +0000799 if (Ty->isConstantSizeType()) {
Chris Lattner2621fd12008-05-08 05:58:21 +0000800 if (!Target.useGlobalsForAutomaticVariables()) {
Richard Smith7edf9e32012-11-01 22:30:59 +0000801 bool NRVO = getLangOpts().ElideConstructors &&
John McCall34695852011-02-22 06:44:22 +0000802 D.isNRVOVariable();
803
804 // If this value is a POD array or struct with a statically
Richard Smith4bb66862011-12-02 00:30:33 +0000805 // determinable constant initializer, there are optimizations we can do.
806 //
Richard Smitha9b21d22012-02-17 06:48:11 +0000807 // TODO: We should constant-evaluate the initializer of any variable,
Richard Smith4bb66862011-12-02 00:30:33 +0000808 // as long as it is initialized by a constant expression. Currently,
809 // isConstantInitializer produces wrong answers for structs with
810 // reference or bitfield members, and a few other cases, and checking
811 // for POD-ness protects us from some of these.
John McCall34695852011-02-22 06:44:22 +0000812 if (D.getInit() &&
Eric Christophere1f54902011-08-23 22:38:00 +0000813 (Ty->isArrayType() || Ty->isRecordType()) &&
John McCallf85e1932011-06-15 23:02:42 +0000814 (Ty.isPODType(getContext()) ||
815 getContext().getBaseElementType(Ty)->isObjCObjectPointerType()) &&
John McCall4204f072010-08-02 21:13:48 +0000816 D.getInit()->isConstantInitializer(getContext(), false)) {
John McCall34695852011-02-22 06:44:22 +0000817
818 // If the variable's a const type, and it's neither an NRVO
Richard Smith4bb66862011-12-02 00:30:33 +0000819 // candidate nor a __block variable and has no mutable members,
820 // emit it as a global instead.
Richard Smitha9b21d22012-02-17 06:48:11 +0000821 if (CGM.getCodeGenOpts().MergeAllConstants && !NRVO && !isByRef &&
822 CGM.isTypeConstant(Ty, true)) {
823 EmitStaticVarDecl(D, llvm::GlobalValue::InternalLinkage);
John McCall34695852011-02-22 06:44:22 +0000824
Richard Smitha9b21d22012-02-17 06:48:11 +0000825 emission.Address = 0; // signal this condition to later callbacks
826 assert(emission.wasEmittedAsGlobal());
827 return emission;
Tanya Lattner59876c22009-11-04 01:18:09 +0000828 }
John McCall34695852011-02-22 06:44:22 +0000829
830 // Otherwise, tell the initialization code that we're in this case.
831 emission.IsConstantAggregate = true;
Tanya Lattner59876c22009-11-04 01:18:09 +0000832 }
Eric Christophere1f54902011-08-23 22:38:00 +0000833
Douglas Gregord86c4772010-05-15 06:46:45 +0000834 // A normal fixed sized variable becomes an alloca in the entry block,
835 // unless it's an NRVO variable.
Chris Lattner2acc6e32011-07-18 04:24:23 +0000836 llvm::Type *LTy = ConvertTypeForMem(Ty);
Eric Christophere1f54902011-08-23 22:38:00 +0000837
Douglas Gregord86c4772010-05-15 06:46:45 +0000838 if (NRVO) {
839 // The named return value optimization: allocate this variable in the
840 // return slot, so that we can elide the copy when returning this
841 // variable (C++0x [class.copy]p34).
842 DeclPtr = ReturnValue;
Eric Christophere1f54902011-08-23 22:38:00 +0000843
Douglas Gregor3d91bbc2010-05-17 15:52:46 +0000844 if (const RecordType *RecordTy = Ty->getAs<RecordType>()) {
845 if (!cast<CXXRecordDecl>(RecordTy->getDecl())->hasTrivialDestructor()) {
846 // Create a flag that is used to indicate when the NRVO was applied
Eric Christophere1f54902011-08-23 22:38:00 +0000847 // to this variable. Set it to zero to indicate that NRVO was not
Douglas Gregor3d91bbc2010-05-17 15:52:46 +0000848 // applied.
Chris Lattner4c53dc12010-12-01 01:47:15 +0000849 llvm::Value *Zero = Builder.getFalse();
John McCall34695852011-02-22 06:44:22 +0000850 llvm::Value *NRVOFlag = CreateTempAlloca(Zero->getType(), "nrvo");
Nick Lewyckya03733b2011-02-16 23:59:08 +0000851 EnsureInsertPoint();
Douglas Gregor3d91bbc2010-05-17 15:52:46 +0000852 Builder.CreateStore(Zero, NRVOFlag);
Eric Christophere1f54902011-08-23 22:38:00 +0000853
Douglas Gregor3d91bbc2010-05-17 15:52:46 +0000854 // Record the NRVO flag for this variable.
855 NRVOFlags[&D] = NRVOFlag;
John McCall34695852011-02-22 06:44:22 +0000856 emission.NRVOFlag = NRVOFlag;
Douglas Gregor3d91bbc2010-05-17 15:52:46 +0000857 }
858 }
Douglas Gregord86c4772010-05-15 06:46:45 +0000859 } else {
860 if (isByRef)
861 LTy = BuildByRefType(&D);
Eric Christophere1f54902011-08-23 22:38:00 +0000862
Douglas Gregord86c4772010-05-15 06:46:45 +0000863 llvm::AllocaInst *Alloc = CreateTempAlloca(LTy);
Benjamin Kramer7a715242011-11-29 14:46:55 +0000864 Alloc->setName(D.getName());
Mike Stump1eb44332009-09-09 15:08:12 +0000865
John McCall34695852011-02-22 06:44:22 +0000866 CharUnits allocaAlignment = alignment;
Douglas Gregord86c4772010-05-15 06:46:45 +0000867 if (isByRef)
Eric Christophere1f54902011-08-23 22:38:00 +0000868 allocaAlignment = std::max(allocaAlignment,
Ken Dyck06f486e2011-01-18 02:01:14 +0000869 getContext().toCharUnitsFromBits(Target.getPointerAlign(0)));
John McCall34695852011-02-22 06:44:22 +0000870 Alloc->setAlignment(allocaAlignment.getQuantity());
Douglas Gregord86c4772010-05-15 06:46:45 +0000871 DeclPtr = Alloc;
872 }
Chris Lattner2621fd12008-05-08 05:58:21 +0000873 } else {
874 // Targets that don't support recursion emit locals as globals.
875 const char *Class =
John McCalld931b082010-08-26 03:08:43 +0000876 D.getStorageClass() == SC_Register ? ".reg." : ".auto.";
John McCallb6bbcc92010-10-15 04:57:14 +0000877 DeclPtr = CreateStaticVarDecl(D, Class,
878 llvm::GlobalValue::InternalLinkage);
Chris Lattner2621fd12008-05-08 05:58:21 +0000879 }
Reid Spencer5f016e22007-07-11 17:01:13 +0000880 } else {
Daniel Dunbard286f052009-07-19 06:58:07 +0000881 EnsureInsertPoint();
882
Anders Carlsson5ecb1b92009-02-09 20:41:50 +0000883 if (!DidCallStackSave) {
Anders Carlsson5d463152008-12-12 07:38:43 +0000884 // Save the stack.
John McCalld16c2cf2011-02-08 08:22:06 +0000885 llvm::Value *Stack = CreateTempAlloca(Int8PtrTy, "saved_stack");
Mike Stump1eb44332009-09-09 15:08:12 +0000886
Anders Carlsson5d463152008-12-12 07:38:43 +0000887 llvm::Value *F = CGM.getIntrinsic(llvm::Intrinsic::stacksave);
888 llvm::Value *V = Builder.CreateCall(F);
Mike Stump1eb44332009-09-09 15:08:12 +0000889
Anders Carlsson5d463152008-12-12 07:38:43 +0000890 Builder.CreateStore(V, Stack);
Anders Carlsson5ecb1b92009-02-09 20:41:50 +0000891
892 DidCallStackSave = true;
Mike Stump1eb44332009-09-09 15:08:12 +0000893
John McCalld8715092010-07-21 06:13:08 +0000894 // Push a cleanup block and restore the stack there.
John McCall3ad32c82011-01-28 08:37:24 +0000895 // FIXME: in general circumstances, this should be an EH cleanup.
John McCall1f0fca52010-07-21 07:22:38 +0000896 EHStack.pushCleanup<CallStackRestore>(NormalCleanup, Stack);
Anders Carlsson5d463152008-12-12 07:38:43 +0000897 }
Mike Stump1eb44332009-09-09 15:08:12 +0000898
John McCallbc8d40d2011-06-24 21:55:10 +0000899 llvm::Value *elementCount;
900 QualType elementType;
901 llvm::tie(elementCount, elementType) = getVLASize(Ty);
Anders Carlsson5d463152008-12-12 07:38:43 +0000902
Chris Lattner2acc6e32011-07-18 04:24:23 +0000903 llvm::Type *llvmTy = ConvertTypeForMem(elementType);
Anders Carlsson5d463152008-12-12 07:38:43 +0000904
905 // Allocate memory for the array.
John McCallbc8d40d2011-06-24 21:55:10 +0000906 llvm::AllocaInst *vla = Builder.CreateAlloca(llvmTy, elementCount, "vla");
907 vla->setAlignment(alignment.getQuantity());
Anders Carlsson41f8a132009-09-26 18:16:06 +0000908
John McCallbc8d40d2011-06-24 21:55:10 +0000909 DeclPtr = vla;
Reid Spencer5f016e22007-07-11 17:01:13 +0000910 }
Eli Friedman8f39f5e2008-12-20 23:11:59 +0000911
Reid Spencer5f016e22007-07-11 17:01:13 +0000912 llvm::Value *&DMEntry = LocalDeclMap[&D];
913 assert(DMEntry == 0 && "Decl already exists in localdeclmap!");
914 DMEntry = DeclPtr;
John McCall34695852011-02-22 06:44:22 +0000915 emission.Address = DeclPtr;
Sanjiv Guptacc9b1632008-05-30 10:30:31 +0000916
917 // Emit debug info for local var declaration.
Devang Patelc594abd2011-06-03 19:21:47 +0000918 if (HaveInsertPoint())
919 if (CGDebugInfo *DI = getDebugInfo()) {
Douglas Gregor4cdad312012-10-23 20:05:01 +0000920 if (CGM.getCodeGenOpts().getDebugInfo()
921 >= CodeGenOptions::LimitedDebugInfo) {
Alexey Samsonovfd00eec2012-05-04 07:39:27 +0000922 DI->setLocation(D.getLocation());
923 if (Target.useGlobalsForAutomaticVariables()) {
924 DI->EmitGlobalVariable(static_cast<llvm::GlobalVariable *>(DeclPtr),
925 &D);
926 } else
927 DI->EmitDeclareOfAutoVariable(&D, DeclPtr, Builder);
928 }
Devang Patelc594abd2011-06-03 19:21:47 +0000929 }
Sanjiv Guptacc9b1632008-05-30 10:30:31 +0000930
Julien Lerouge77f68bb2011-09-09 22:41:49 +0000931 if (D.hasAttr<AnnotateAttr>())
932 EmitVarAnnotations(&D, emission.Address);
933
John McCall34695852011-02-22 06:44:22 +0000934 return emission;
935}
936
937/// Determines whether the given __block variable is potentially
938/// captured by the given expression.
939static bool isCapturedBy(const VarDecl &var, const Expr *e) {
940 // Skip the most common kinds of expressions that make
941 // hierarchy-walking expensive.
942 e = e->IgnoreParenCasts();
943
944 if (const BlockExpr *be = dyn_cast<BlockExpr>(e)) {
945 const BlockDecl *block = be->getBlockDecl();
946 for (BlockDecl::capture_const_iterator i = block->capture_begin(),
947 e = block->capture_end(); i != e; ++i) {
948 if (i->getVariable() == &var)
949 return true;
950 }
951
952 // No need to walk into the subexpressions.
953 return false;
954 }
955
Fariborz Jahanian5033be12011-08-23 16:47:15 +0000956 if (const StmtExpr *SE = dyn_cast<StmtExpr>(e)) {
957 const CompoundStmt *CS = SE->getSubStmt();
Eric Christopherc6fad602011-08-23 23:44:09 +0000958 for (CompoundStmt::const_body_iterator BI = CS->body_begin(),
959 BE = CS->body_end(); BI != BE; ++BI)
Fariborz Jahanian045c8422011-08-25 00:06:26 +0000960 if (Expr *E = dyn_cast<Expr>((*BI))) {
Fariborz Jahanian5033be12011-08-23 16:47:15 +0000961 if (isCapturedBy(var, E))
962 return true;
Fariborz Jahanian045c8422011-08-25 00:06:26 +0000963 }
964 else if (DeclStmt *DS = dyn_cast<DeclStmt>((*BI))) {
965 // special case declarations
966 for (DeclStmt::decl_iterator I = DS->decl_begin(), E = DS->decl_end();
967 I != E; ++I) {
968 if (VarDecl *VD = dyn_cast<VarDecl>((*I))) {
969 Expr *Init = VD->getInit();
970 if (Init && isCapturedBy(var, Init))
971 return true;
972 }
973 }
974 }
975 else
976 // FIXME. Make safe assumption assuming arbitrary statements cause capturing.
977 // Later, provide code to poke into statements for capture analysis.
978 return true;
Fariborz Jahanian5033be12011-08-23 16:47:15 +0000979 return false;
980 }
Eric Christophere1f54902011-08-23 22:38:00 +0000981
John McCall34695852011-02-22 06:44:22 +0000982 for (Stmt::const_child_range children = e->children(); children; ++children)
983 if (isCapturedBy(var, cast<Expr>(*children)))
984 return true;
985
986 return false;
987}
988
Douglas Gregorbcc3e662011-07-01 21:08:19 +0000989/// \brief Determine whether the given initializer is trivial in the sense
990/// that it requires no code to be generated.
991static bool isTrivialInitializer(const Expr *Init) {
992 if (!Init)
993 return true;
Eric Christophere1f54902011-08-23 22:38:00 +0000994
Douglas Gregorbcc3e662011-07-01 21:08:19 +0000995 if (const CXXConstructExpr *Construct = dyn_cast<CXXConstructExpr>(Init))
996 if (CXXConstructorDecl *Constructor = Construct->getConstructor())
997 if (Constructor->isTrivial() &&
998 Constructor->isDefaultConstructor() &&
999 !Construct->requiresZeroInitialization())
1000 return true;
Eric Christophere1f54902011-08-23 22:38:00 +00001001
Douglas Gregorbcc3e662011-07-01 21:08:19 +00001002 return false;
1003}
John McCall34695852011-02-22 06:44:22 +00001004void CodeGenFunction::EmitAutoVarInit(const AutoVarEmission &emission) {
John McCall57b3b6a2011-02-22 07:16:58 +00001005 assert(emission.Variable && "emission was not valid!");
1006
John McCall34695852011-02-22 06:44:22 +00001007 // If this was emitted as a global constant, we're done.
1008 if (emission.wasEmittedAsGlobal()) return;
1009
John McCall57b3b6a2011-02-22 07:16:58 +00001010 const VarDecl &D = *emission.Variable;
John McCall34695852011-02-22 06:44:22 +00001011 QualType type = D.getType();
1012
Chris Lattner19785962007-07-12 00:39:48 +00001013 // If this local has an initializer, emit it now.
Daniel Dunbard286f052009-07-19 06:58:07 +00001014 const Expr *Init = D.getInit();
1015
1016 // If we are at an unreachable point, we don't need to emit the initializer
1017 // unless it contains a label.
1018 if (!HaveInsertPoint()) {
John McCall34695852011-02-22 06:44:22 +00001019 if (!Init || !ContainsLabel(Init)) return;
1020 EnsureInsertPoint();
Daniel Dunbard286f052009-07-19 06:58:07 +00001021 }
1022
John McCall5af02db2011-03-31 01:59:53 +00001023 // Initialize the structure of a __block variable.
1024 if (emission.IsByRef)
1025 emitByrefStructureInit(emission);
Anders Carlsson69c68b72009-02-07 23:51:38 +00001026
Douglas Gregorbcc3e662011-07-01 21:08:19 +00001027 if (isTrivialInitializer(Init))
1028 return;
Eric Christophere1f54902011-08-23 22:38:00 +00001029
John McCall5af02db2011-03-31 01:59:53 +00001030 CharUnits alignment = emission.Alignment;
1031
John McCall34695852011-02-22 06:44:22 +00001032 // Check whether this is a byref variable that's potentially
1033 // captured and moved by its own initializer. If so, we'll need to
1034 // emit the initializer first, then copy into the variable.
1035 bool capturedByInit = emission.IsByRef && isCapturedBy(D, Init);
1036
1037 llvm::Value *Loc =
1038 capturedByInit ? emission.Address : emission.getObjectAddress(*this);
1039
Richard Smith51201882011-12-30 21:15:51 +00001040 llvm::Constant *constant = 0;
1041 if (emission.IsConstantAggregate) {
1042 assert(!capturedByInit && "constant init contains a capturing block?");
Richard Smith2d6a5672012-01-14 04:30:29 +00001043 constant = CGM.EmitConstantInit(D, this);
Richard Smith51201882011-12-30 21:15:51 +00001044 }
1045
1046 if (!constant) {
Eli Friedman6da2c712011-12-03 04:14:32 +00001047 LValue lv = MakeAddrLValue(Loc, type, alignment);
John McCalla07398e2011-06-16 04:16:24 +00001048 lv.setNonGC(true);
1049 return EmitExprAsInit(Init, &D, lv, capturedByInit);
1050 }
John McCall60d33652011-03-08 09:11:50 +00001051
John McCall34695852011-02-22 06:44:22 +00001052 // If this is a simple aggregate initialization, we can optimize it
1053 // in various ways.
John McCall60d33652011-03-08 09:11:50 +00001054 bool isVolatile = type.isVolatileQualified();
John McCall34695852011-02-22 06:44:22 +00001055
John McCall60d33652011-03-08 09:11:50 +00001056 llvm::Value *SizeVal =
Eric Christophere1f54902011-08-23 22:38:00 +00001057 llvm::ConstantInt::get(IntPtrTy,
John McCall60d33652011-03-08 09:11:50 +00001058 getContext().getTypeSizeInChars(type).getQuantity());
John McCall34695852011-02-22 06:44:22 +00001059
Chris Lattner2acc6e32011-07-18 04:24:23 +00001060 llvm::Type *BP = Int8PtrTy;
John McCall60d33652011-03-08 09:11:50 +00001061 if (Loc->getType() != BP)
Benjamin Kramer578faa82011-09-27 21:06:10 +00001062 Loc = Builder.CreateBitCast(Loc, BP);
Mon P Wang3ecd7852010-04-04 03:10:52 +00001063
John McCall60d33652011-03-08 09:11:50 +00001064 // If the initializer is all or mostly zeros, codegen with memset then do
1065 // a few stores afterward.
Eric Christophere1f54902011-08-23 22:38:00 +00001066 if (shouldUseMemSetPlusStoresToInitialize(constant,
Micah Villmow25a6a842012-10-08 16:25:52 +00001067 CGM.getDataLayout().getTypeAllocSize(constant->getType()))) {
John McCall60d33652011-03-08 09:11:50 +00001068 Builder.CreateMemSet(Loc, llvm::ConstantInt::get(Int8Ty, 0), SizeVal,
1069 alignment.getQuantity(), isVolatile);
Benjamin Kramer06d43682012-08-27 22:07:02 +00001070 // Zero and undef don't require a stores.
1071 if (!constant->isNullValue() && !isa<llvm::UndefValue>(constant)) {
John McCall60d33652011-03-08 09:11:50 +00001072 Loc = Builder.CreateBitCast(Loc, constant->getType()->getPointerTo());
1073 emitStoresForInitAfterMemset(constant, Loc, isVolatile, Builder);
Fariborz Jahanian20e1c7e2010-03-12 21:40:43 +00001074 }
John McCall60d33652011-03-08 09:11:50 +00001075 } else {
Eric Christophere1f54902011-08-23 22:38:00 +00001076 // Otherwise, create a temporary global with the initializer then
John McCall60d33652011-03-08 09:11:50 +00001077 // memcpy from the global to the alloca.
1078 std::string Name = GetStaticDeclName(*this, D, ".");
1079 llvm::GlobalVariable *GV =
1080 new llvm::GlobalVariable(CGM.getModule(), constant->getType(), true,
Eric Christopher736a9c22011-08-24 00:33:55 +00001081 llvm::GlobalValue::PrivateLinkage,
Hans Wennborg5e2d5de2012-06-23 11:51:46 +00001082 constant, Name);
John McCall60d33652011-03-08 09:11:50 +00001083 GV->setAlignment(alignment.getQuantity());
Eli Friedman460980d2011-05-27 22:32:55 +00001084 GV->setUnnamedAddr(true);
Eric Christophere1f54902011-08-23 22:38:00 +00001085
John McCall60d33652011-03-08 09:11:50 +00001086 llvm::Value *SrcPtr = GV;
1087 if (SrcPtr->getType() != BP)
Benjamin Kramer578faa82011-09-27 21:06:10 +00001088 SrcPtr = Builder.CreateBitCast(SrcPtr, BP);
John McCall60d33652011-03-08 09:11:50 +00001089
1090 Builder.CreateMemCpy(Loc, SrcPtr, SizeVal, alignment.getQuantity(),
1091 isVolatile);
1092 }
1093}
1094
1095/// Emit an expression as an initializer for a variable at the given
1096/// location. The expression is not necessarily the normal
1097/// initializer for the variable, and the address is not necessarily
1098/// its normal location.
1099///
1100/// \param init the initializing expression
1101/// \param var the variable to act as if we're initializing
1102/// \param loc the address to initialize; its type is a pointer
1103/// to the LLVM mapping of the variable's type
1104/// \param alignment the alignment of the address
1105/// \param capturedByInit true if the variable is a __block variable
1106/// whose address is potentially changed by the initializer
1107void CodeGenFunction::EmitExprAsInit(const Expr *init,
John McCallf85e1932011-06-15 23:02:42 +00001108 const ValueDecl *D,
John McCalla07398e2011-06-16 04:16:24 +00001109 LValue lvalue,
John McCall60d33652011-03-08 09:11:50 +00001110 bool capturedByInit) {
John McCallf85e1932011-06-15 23:02:42 +00001111 QualType type = D->getType();
John McCall60d33652011-03-08 09:11:50 +00001112
1113 if (type->isReferenceType()) {
John McCalla07398e2011-06-16 04:16:24 +00001114 RValue rvalue = EmitReferenceBindingToExpr(init, D);
Eric Christophere1f54902011-08-23 22:38:00 +00001115 if (capturedByInit)
John McCalla07398e2011-06-16 04:16:24 +00001116 drillIntoBlockVariable(*this, lvalue, cast<VarDecl>(D));
David Chisnall7a7ee302012-01-16 17:27:18 +00001117 EmitStoreThroughLValue(rvalue, lvalue, true);
John McCall9d232c82013-03-07 21:37:08 +00001118 return;
1119 }
1120 switch (getEvaluationKind(type)) {
1121 case TEK_Scalar:
John McCalla07398e2011-06-16 04:16:24 +00001122 EmitScalarInit(init, D, lvalue, capturedByInit);
John McCall9d232c82013-03-07 21:37:08 +00001123 return;
1124 case TEK_Complex: {
John McCall60d33652011-03-08 09:11:50 +00001125 ComplexPairTy complex = EmitComplexExpr(init);
John McCalla07398e2011-06-16 04:16:24 +00001126 if (capturedByInit)
1127 drillIntoBlockVariable(*this, lvalue, cast<VarDecl>(D));
John McCall9d232c82013-03-07 21:37:08 +00001128 EmitStoreOfComplex(complex, lvalue, /*init*/ true);
1129 return;
1130 }
1131 case TEK_Aggregate:
John McCall34695852011-02-22 06:44:22 +00001132 // TODO: how can we delay here if D is captured by its initializer?
John McCall7c2349b2011-08-25 20:40:09 +00001133 EmitAggExpr(init, AggValueSlot::forLValue(lvalue,
Chad Rosier649b4a12012-03-29 17:37:10 +00001134 AggValueSlot::IsDestructed,
John McCall410ffb22011-08-25 23:04:34 +00001135 AggValueSlot::DoesNotNeedGCBarriers,
Chad Rosier649b4a12012-03-29 17:37:10 +00001136 AggValueSlot::IsNotAliased));
Sebastian Redl972edf02012-02-19 16:03:09 +00001137 MaybeEmitStdInitializerListCleanup(lvalue.getAddress(), init);
John McCall9d232c82013-03-07 21:37:08 +00001138 return;
Fariborz Jahanian20e1c7e2010-03-12 21:40:43 +00001139 }
John McCall9d232c82013-03-07 21:37:08 +00001140 llvm_unreachable("bad evaluation kind");
John McCall34695852011-02-22 06:44:22 +00001141}
John McCallf1549f62010-07-06 01:34:17 +00001142
John McCallbdc4d802011-07-09 01:37:26 +00001143/// Enter a destroy cleanup for the given local variable.
1144void CodeGenFunction::emitAutoVarTypeCleanup(
1145 const CodeGenFunction::AutoVarEmission &emission,
1146 QualType::DestructionKind dtorKind) {
1147 assert(dtorKind != QualType::DK_none);
1148
1149 // Note that for __block variables, we want to destroy the
1150 // original stack object, not the possibly forwarded object.
1151 llvm::Value *addr = emission.getObjectAddress(*this);
1152
1153 const VarDecl *var = emission.Variable;
1154 QualType type = var->getType();
1155
1156 CleanupKind cleanupKind = NormalAndEHCleanup;
1157 CodeGenFunction::Destroyer *destroyer = 0;
1158
1159 switch (dtorKind) {
1160 case QualType::DK_none:
1161 llvm_unreachable("no cleanup for trivially-destructible variable");
1162
1163 case QualType::DK_cxx_destructor:
1164 // If there's an NRVO flag on the emission, we need a different
1165 // cleanup.
1166 if (emission.NRVOFlag) {
1167 assert(!type->isArrayType());
1168 CXXDestructorDecl *dtor = type->getAsCXXRecordDecl()->getDestructor();
1169 EHStack.pushCleanup<DestroyNRVOVariable>(cleanupKind, addr, dtor,
1170 emission.NRVOFlag);
1171 return;
1172 }
1173 break;
1174
1175 case QualType::DK_objc_strong_lifetime:
1176 // Suppress cleanups for pseudo-strong variables.
1177 if (var->isARCPseudoStrong()) return;
Eric Christophere1f54902011-08-23 22:38:00 +00001178
John McCallbdc4d802011-07-09 01:37:26 +00001179 // Otherwise, consider whether to use an EH cleanup or not.
1180 cleanupKind = getARCCleanupKind();
1181
1182 // Use the imprecise destroyer by default.
1183 if (!var->hasAttr<ObjCPreciseLifetimeAttr>())
1184 destroyer = CodeGenFunction::destroyARCStrongImprecise;
1185 break;
1186
1187 case QualType::DK_objc_weak_lifetime:
1188 break;
1189 }
1190
1191 // If we haven't chosen a more specific destroyer, use the default.
Peter Collingbourne516bbd42012-01-26 03:33:36 +00001192 if (!destroyer) destroyer = getDestroyer(dtorKind);
John McCall2673c682011-07-11 08:38:19 +00001193
Sylvestre Ledruf3477c12012-09-27 10:16:10 +00001194 // Use an EH cleanup in array destructors iff the destructor itself
John McCall2673c682011-07-11 08:38:19 +00001195 // is being pushed as an EH cleanup.
1196 bool useEHCleanup = (cleanupKind & EHCleanup);
1197 EHStack.pushCleanup<DestroyObject>(cleanupKind, addr, type, destroyer,
1198 useEHCleanup);
John McCallbdc4d802011-07-09 01:37:26 +00001199}
1200
John McCall34695852011-02-22 06:44:22 +00001201void CodeGenFunction::EmitAutoVarCleanups(const AutoVarEmission &emission) {
John McCall57b3b6a2011-02-22 07:16:58 +00001202 assert(emission.Variable && "emission was not valid!");
1203
John McCall34695852011-02-22 06:44:22 +00001204 // If this was emitted as a global constant, we're done.
1205 if (emission.wasEmittedAsGlobal()) return;
1206
John McCall38baeab2012-04-13 18:44:05 +00001207 // If we don't have an insertion point, we're done. Sema prevents
1208 // us from jumping into any of these scopes anyway.
1209 if (!HaveInsertPoint()) return;
1210
John McCall57b3b6a2011-02-22 07:16:58 +00001211 const VarDecl &D = *emission.Variable;
John McCall34695852011-02-22 06:44:22 +00001212
John McCallbdc4d802011-07-09 01:37:26 +00001213 // Check the type for a cleanup.
1214 if (QualType::DestructionKind dtorKind = D.getType().isDestructedType())
1215 emitAutoVarTypeCleanup(emission, dtorKind);
John McCallf85e1932011-06-15 23:02:42 +00001216
John McCall0c24c802011-06-24 23:21:27 +00001217 // In GC mode, honor objc_precise_lifetime.
David Blaikie4e4d0842012-03-11 07:00:24 +00001218 if (getLangOpts().getGC() != LangOptions::NonGC &&
John McCall0c24c802011-06-24 23:21:27 +00001219 D.hasAttr<ObjCPreciseLifetimeAttr>()) {
1220 EHStack.pushCleanup<ExtendGCLifetime>(NormalCleanup, &D);
1221 }
1222
John McCall34695852011-02-22 06:44:22 +00001223 // Handle the cleanup attribute.
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +00001224 if (const CleanupAttr *CA = D.getAttr<CleanupAttr>()) {
Anders Carlsson69c68b72009-02-07 23:51:38 +00001225 const FunctionDecl *FD = CA->getFunctionDecl();
Mike Stump1eb44332009-09-09 15:08:12 +00001226
John McCall34695852011-02-22 06:44:22 +00001227 llvm::Constant *F = CGM.GetAddrOfFunction(FD);
Anders Carlsson69c68b72009-02-07 23:51:38 +00001228 assert(F && "Could not find function!");
Mike Stump1eb44332009-09-09 15:08:12 +00001229
John McCallde5d3c72012-02-17 03:33:10 +00001230 const CGFunctionInfo &Info = CGM.getTypes().arrangeFunctionDeclaration(FD);
John McCall34695852011-02-22 06:44:22 +00001231 EHStack.pushCleanup<CallCleanupFunction>(NormalAndEHCleanup, F, &Info, &D);
Anders Carlsson69c68b72009-02-07 23:51:38 +00001232 }
Mike Stump797b6322009-03-05 01:23:13 +00001233
John McCall34695852011-02-22 06:44:22 +00001234 // If this is a block variable, call _Block_object_destroy
1235 // (on the unforwarded address).
John McCall5af02db2011-03-31 01:59:53 +00001236 if (emission.IsByRef)
1237 enterByrefCleanup(emission);
Reid Spencer5f016e22007-07-11 17:01:13 +00001238}
1239
Peter Collingbourne516bbd42012-01-26 03:33:36 +00001240CodeGenFunction::Destroyer *
John McCallbdc4d802011-07-09 01:37:26 +00001241CodeGenFunction::getDestroyer(QualType::DestructionKind kind) {
1242 switch (kind) {
1243 case QualType::DK_none: llvm_unreachable("no destroyer for trivial dtor");
John McCall0850e8d2011-07-09 09:09:00 +00001244 case QualType::DK_cxx_destructor:
Peter Collingbourne516bbd42012-01-26 03:33:36 +00001245 return destroyCXXObject;
John McCall0850e8d2011-07-09 09:09:00 +00001246 case QualType::DK_objc_strong_lifetime:
Peter Collingbourne516bbd42012-01-26 03:33:36 +00001247 return destroyARCStrongPrecise;
John McCall0850e8d2011-07-09 09:09:00 +00001248 case QualType::DK_objc_weak_lifetime:
Peter Collingbourne516bbd42012-01-26 03:33:36 +00001249 return destroyARCWeak;
John McCallbdc4d802011-07-09 01:37:26 +00001250 }
Matt Beaumont-Gayba4be252012-01-27 00:46:27 +00001251 llvm_unreachable("Unknown DestructionKind");
John McCallbdc4d802011-07-09 01:37:26 +00001252}
1253
John McCall074cae02013-02-01 05:11:40 +00001254/// pushEHDestroy - Push the standard destructor for the given type as
1255/// an EH-only cleanup.
1256void CodeGenFunction::pushEHDestroy(QualType::DestructionKind dtorKind,
1257 llvm::Value *addr, QualType type) {
1258 assert(dtorKind && "cannot push destructor for trivial type");
1259 assert(needsEHCleanup(dtorKind));
1260
1261 pushDestroy(EHCleanup, addr, type, getDestroyer(dtorKind), true);
1262}
1263
1264/// pushDestroy - Push the standard destructor for the given type as
1265/// at least a normal cleanup.
John McCall9928c482011-07-12 16:41:08 +00001266void CodeGenFunction::pushDestroy(QualType::DestructionKind dtorKind,
1267 llvm::Value *addr, QualType type) {
1268 assert(dtorKind && "cannot push destructor for trivial type");
1269
1270 CleanupKind cleanupKind = getCleanupKind(dtorKind);
1271 pushDestroy(cleanupKind, addr, type, getDestroyer(dtorKind),
1272 cleanupKind & EHCleanup);
1273}
1274
John McCallbdc4d802011-07-09 01:37:26 +00001275void CodeGenFunction::pushDestroy(CleanupKind cleanupKind, llvm::Value *addr,
Peter Collingbourne516bbd42012-01-26 03:33:36 +00001276 QualType type, Destroyer *destroyer,
John McCall2673c682011-07-11 08:38:19 +00001277 bool useEHCleanupForArray) {
John McCall9928c482011-07-12 16:41:08 +00001278 pushFullExprCleanup<DestroyObject>(cleanupKind, addr, type,
1279 destroyer, useEHCleanupForArray);
John McCallbdc4d802011-07-09 01:37:26 +00001280}
1281
John McCall2673c682011-07-11 08:38:19 +00001282/// emitDestroy - Immediately perform the destruction of the given
1283/// object.
1284///
1285/// \param addr - the address of the object; a type*
1286/// \param type - the type of the object; if an array type, all
1287/// objects are destroyed in reverse order
1288/// \param destroyer - the function to call to destroy individual
1289/// elements
1290/// \param useEHCleanupForArray - whether an EH cleanup should be
1291/// used when destroying array elements, in case one of the
1292/// destructions throws an exception
John McCallbdc4d802011-07-09 01:37:26 +00001293void CodeGenFunction::emitDestroy(llvm::Value *addr, QualType type,
Peter Collingbourne516bbd42012-01-26 03:33:36 +00001294 Destroyer *destroyer,
John McCall2673c682011-07-11 08:38:19 +00001295 bool useEHCleanupForArray) {
John McCallbdc4d802011-07-09 01:37:26 +00001296 const ArrayType *arrayType = getContext().getAsArrayType(type);
1297 if (!arrayType)
1298 return destroyer(*this, addr, type);
1299
1300 llvm::Value *begin = addr;
1301 llvm::Value *length = emitArrayLength(arrayType, type, begin);
John McCallfbf780a2011-07-13 08:09:46 +00001302
1303 // Normally we have to check whether the array is zero-length.
1304 bool checkZeroLength = true;
1305
1306 // But if the array length is constant, we can suppress that.
1307 if (llvm::ConstantInt *constLength = dyn_cast<llvm::ConstantInt>(length)) {
1308 // ...and if it's constant zero, we can just skip the entire thing.
1309 if (constLength->isZero()) return;
1310 checkZeroLength = false;
1311 }
1312
John McCallbdc4d802011-07-09 01:37:26 +00001313 llvm::Value *end = Builder.CreateInBoundsGEP(begin, length);
John McCallfbf780a2011-07-13 08:09:46 +00001314 emitArrayDestroy(begin, end, type, destroyer,
1315 checkZeroLength, useEHCleanupForArray);
John McCallbdc4d802011-07-09 01:37:26 +00001316}
1317
John McCall2673c682011-07-11 08:38:19 +00001318/// emitArrayDestroy - Destroys all the elements of the given array,
1319/// beginning from last to first. The array cannot be zero-length.
1320///
1321/// \param begin - a type* denoting the first element of the array
1322/// \param end - a type* denoting one past the end of the array
1323/// \param type - the element type of the array
1324/// \param destroyer - the function to call to destroy elements
1325/// \param useEHCleanup - whether to push an EH cleanup to destroy
1326/// the remaining elements in case the destruction of a single
1327/// element throws
John McCallbdc4d802011-07-09 01:37:26 +00001328void CodeGenFunction::emitArrayDestroy(llvm::Value *begin,
1329 llvm::Value *end,
1330 QualType type,
Peter Collingbourne516bbd42012-01-26 03:33:36 +00001331 Destroyer *destroyer,
John McCallfbf780a2011-07-13 08:09:46 +00001332 bool checkZeroLength,
John McCall2673c682011-07-11 08:38:19 +00001333 bool useEHCleanup) {
John McCallbdc4d802011-07-09 01:37:26 +00001334 assert(!type->isArrayType());
1335
1336 // The basic structure here is a do-while loop, because we don't
1337 // need to check for the zero-element case.
1338 llvm::BasicBlock *bodyBB = createBasicBlock("arraydestroy.body");
1339 llvm::BasicBlock *doneBB = createBasicBlock("arraydestroy.done");
1340
John McCallfbf780a2011-07-13 08:09:46 +00001341 if (checkZeroLength) {
1342 llvm::Value *isEmpty = Builder.CreateICmpEQ(begin, end,
1343 "arraydestroy.isempty");
1344 Builder.CreateCondBr(isEmpty, doneBB, bodyBB);
1345 }
1346
John McCallbdc4d802011-07-09 01:37:26 +00001347 // Enter the loop body, making that address the current address.
1348 llvm::BasicBlock *entryBB = Builder.GetInsertBlock();
1349 EmitBlock(bodyBB);
1350 llvm::PHINode *elementPast =
1351 Builder.CreatePHI(begin->getType(), 2, "arraydestroy.elementPast");
1352 elementPast->addIncoming(end, entryBB);
1353
1354 // Shift the address back by one element.
1355 llvm::Value *negativeOne = llvm::ConstantInt::get(SizeTy, -1, true);
1356 llvm::Value *element = Builder.CreateInBoundsGEP(elementPast, negativeOne,
1357 "arraydestroy.element");
1358
John McCall2673c682011-07-11 08:38:19 +00001359 if (useEHCleanup)
1360 pushRegularPartialArrayCleanup(begin, element, type, destroyer);
1361
John McCallbdc4d802011-07-09 01:37:26 +00001362 // Perform the actual destruction there.
1363 destroyer(*this, element, type);
1364
John McCall2673c682011-07-11 08:38:19 +00001365 if (useEHCleanup)
1366 PopCleanupBlock();
1367
John McCallbdc4d802011-07-09 01:37:26 +00001368 // Check whether we've reached the end.
1369 llvm::Value *done = Builder.CreateICmpEQ(element, begin, "arraydestroy.done");
1370 Builder.CreateCondBr(done, doneBB, bodyBB);
1371 elementPast->addIncoming(element, Builder.GetInsertBlock());
1372
1373 // Done.
1374 EmitBlock(doneBB);
1375}
1376
John McCall2673c682011-07-11 08:38:19 +00001377/// Perform partial array destruction as if in an EH cleanup. Unlike
1378/// emitArrayDestroy, the element type here may still be an array type.
John McCall2673c682011-07-11 08:38:19 +00001379static void emitPartialArrayDestroy(CodeGenFunction &CGF,
1380 llvm::Value *begin, llvm::Value *end,
1381 QualType type,
Peter Collingbourne516bbd42012-01-26 03:33:36 +00001382 CodeGenFunction::Destroyer *destroyer) {
John McCall2673c682011-07-11 08:38:19 +00001383 // If the element type is itself an array, drill down.
John McCallfbf780a2011-07-13 08:09:46 +00001384 unsigned arrayDepth = 0;
John McCall2673c682011-07-11 08:38:19 +00001385 while (const ArrayType *arrayType = CGF.getContext().getAsArrayType(type)) {
1386 // VLAs don't require a GEP index to walk into.
1387 if (!isa<VariableArrayType>(arrayType))
John McCallfbf780a2011-07-13 08:09:46 +00001388 arrayDepth++;
John McCall2673c682011-07-11 08:38:19 +00001389 type = arrayType->getElementType();
1390 }
John McCallfbf780a2011-07-13 08:09:46 +00001391
1392 if (arrayDepth) {
1393 llvm::Value *zero = llvm::ConstantInt::get(CGF.SizeTy, arrayDepth+1);
1394
Chris Lattner5f9e2722011-07-23 10:55:15 +00001395 SmallVector<llvm::Value*,4> gepIndices(arrayDepth, zero);
Jay Foad0f6ac7c2011-07-22 08:16:57 +00001396 begin = CGF.Builder.CreateInBoundsGEP(begin, gepIndices, "pad.arraybegin");
1397 end = CGF.Builder.CreateInBoundsGEP(end, gepIndices, "pad.arrayend");
John McCall2673c682011-07-11 08:38:19 +00001398 }
1399
John McCallfbf780a2011-07-13 08:09:46 +00001400 // Destroy the array. We don't ever need an EH cleanup because we
1401 // assume that we're in an EH cleanup ourselves, so a throwing
1402 // destructor causes an immediate terminate.
1403 CGF.emitArrayDestroy(begin, end, type, destroyer,
1404 /*checkZeroLength*/ true, /*useEHCleanup*/ false);
John McCall2673c682011-07-11 08:38:19 +00001405}
1406
John McCallbdc4d802011-07-09 01:37:26 +00001407namespace {
John McCall2673c682011-07-11 08:38:19 +00001408 /// RegularPartialArrayDestroy - a cleanup which performs a partial
1409 /// array destroy where the end pointer is regularly determined and
1410 /// does not need to be loaded from a local.
1411 class RegularPartialArrayDestroy : public EHScopeStack::Cleanup {
1412 llvm::Value *ArrayBegin;
1413 llvm::Value *ArrayEnd;
1414 QualType ElementType;
Peter Collingbourne516bbd42012-01-26 03:33:36 +00001415 CodeGenFunction::Destroyer *Destroyer;
John McCall2673c682011-07-11 08:38:19 +00001416 public:
1417 RegularPartialArrayDestroy(llvm::Value *arrayBegin, llvm::Value *arrayEnd,
1418 QualType elementType,
1419 CodeGenFunction::Destroyer *destroyer)
1420 : ArrayBegin(arrayBegin), ArrayEnd(arrayEnd),
Peter Collingbourne516bbd42012-01-26 03:33:36 +00001421 ElementType(elementType), Destroyer(destroyer) {}
John McCall2673c682011-07-11 08:38:19 +00001422
John McCallad346f42011-07-12 20:27:29 +00001423 void Emit(CodeGenFunction &CGF, Flags flags) {
John McCall2673c682011-07-11 08:38:19 +00001424 emitPartialArrayDestroy(CGF, ArrayBegin, ArrayEnd,
1425 ElementType, Destroyer);
1426 }
1427 };
1428
1429 /// IrregularPartialArrayDestroy - a cleanup which performs a
1430 /// partial array destroy where the end pointer is irregularly
1431 /// determined and must be loaded from a local.
1432 class IrregularPartialArrayDestroy : public EHScopeStack::Cleanup {
John McCallbdc4d802011-07-09 01:37:26 +00001433 llvm::Value *ArrayBegin;
1434 llvm::Value *ArrayEndPointer;
1435 QualType ElementType;
Peter Collingbourne516bbd42012-01-26 03:33:36 +00001436 CodeGenFunction::Destroyer *Destroyer;
John McCallbdc4d802011-07-09 01:37:26 +00001437 public:
John McCall2673c682011-07-11 08:38:19 +00001438 IrregularPartialArrayDestroy(llvm::Value *arrayBegin,
1439 llvm::Value *arrayEndPointer,
1440 QualType elementType,
1441 CodeGenFunction::Destroyer *destroyer)
John McCallbdc4d802011-07-09 01:37:26 +00001442 : ArrayBegin(arrayBegin), ArrayEndPointer(arrayEndPointer),
Peter Collingbourne516bbd42012-01-26 03:33:36 +00001443 ElementType(elementType), Destroyer(destroyer) {}
John McCallbdc4d802011-07-09 01:37:26 +00001444
John McCallad346f42011-07-12 20:27:29 +00001445 void Emit(CodeGenFunction &CGF, Flags flags) {
John McCallbdc4d802011-07-09 01:37:26 +00001446 llvm::Value *arrayEnd = CGF.Builder.CreateLoad(ArrayEndPointer);
John McCall2673c682011-07-11 08:38:19 +00001447 emitPartialArrayDestroy(CGF, ArrayBegin, arrayEnd,
1448 ElementType, Destroyer);
John McCallbdc4d802011-07-09 01:37:26 +00001449 }
1450 };
1451}
1452
John McCall2673c682011-07-11 08:38:19 +00001453/// pushIrregularPartialArrayCleanup - Push an EH cleanup to destroy
John McCallbdc4d802011-07-09 01:37:26 +00001454/// already-constructed elements of the given array. The cleanup
John McCall2673c682011-07-11 08:38:19 +00001455/// may be popped with DeactivateCleanupBlock or PopCleanupBlock.
Eric Christophere1f54902011-08-23 22:38:00 +00001456///
John McCallbdc4d802011-07-09 01:37:26 +00001457/// \param elementType - the immediate element type of the array;
1458/// possibly still an array type
John McCall9928c482011-07-12 16:41:08 +00001459void CodeGenFunction::pushIrregularPartialArrayCleanup(llvm::Value *arrayBegin,
John McCall2673c682011-07-11 08:38:19 +00001460 llvm::Value *arrayEndPointer,
1461 QualType elementType,
Peter Collingbourne516bbd42012-01-26 03:33:36 +00001462 Destroyer *destroyer) {
John McCall9928c482011-07-12 16:41:08 +00001463 pushFullExprCleanup<IrregularPartialArrayDestroy>(EHCleanup,
1464 arrayBegin, arrayEndPointer,
Peter Collingbourne516bbd42012-01-26 03:33:36 +00001465 elementType, destroyer);
John McCall2673c682011-07-11 08:38:19 +00001466}
1467
1468/// pushRegularPartialArrayCleanup - Push an EH cleanup to destroy
1469/// already-constructed elements of the given array. The cleanup
1470/// may be popped with DeactivateCleanupBlock or PopCleanupBlock.
Eric Christophere1f54902011-08-23 22:38:00 +00001471///
John McCall2673c682011-07-11 08:38:19 +00001472/// \param elementType - the immediate element type of the array;
1473/// possibly still an array type
John McCall2673c682011-07-11 08:38:19 +00001474void CodeGenFunction::pushRegularPartialArrayCleanup(llvm::Value *arrayBegin,
1475 llvm::Value *arrayEnd,
1476 QualType elementType,
Peter Collingbourne516bbd42012-01-26 03:33:36 +00001477 Destroyer *destroyer) {
John McCall9928c482011-07-12 16:41:08 +00001478 pushFullExprCleanup<RegularPartialArrayDestroy>(EHCleanup,
John McCall2673c682011-07-11 08:38:19 +00001479 arrayBegin, arrayEnd,
Peter Collingbourne516bbd42012-01-26 03:33:36 +00001480 elementType, destroyer);
John McCallbdc4d802011-07-09 01:37:26 +00001481}
1482
John McCallf85e1932011-06-15 23:02:42 +00001483namespace {
1484 /// A cleanup to perform a release of an object at the end of a
1485 /// function. This is used to balance out the incoming +1 of a
1486 /// ns_consumed argument when we can't reasonably do that just by
1487 /// not doing the initial retain for a __block argument.
1488 struct ConsumeARCParameter : EHScopeStack::Cleanup {
1489 ConsumeARCParameter(llvm::Value *param) : Param(param) {}
1490
1491 llvm::Value *Param;
1492
John McCallad346f42011-07-12 20:27:29 +00001493 void Emit(CodeGenFunction &CGF, Flags flags) {
John McCallf85e1932011-06-15 23:02:42 +00001494 CGF.EmitARCRelease(Param, /*precise*/ false);
1495 }
1496 };
1497}
1498
Mike Stump1eb44332009-09-09 15:08:12 +00001499/// Emit an alloca (or GlobalValue depending on target)
Chris Lattner2621fd12008-05-08 05:58:21 +00001500/// for the specified parameter and set up LocalDeclMap.
Devang Patel093ac462011-03-03 20:13:15 +00001501void CodeGenFunction::EmitParmDecl(const VarDecl &D, llvm::Value *Arg,
1502 unsigned ArgNo) {
Daniel Dunbarb7ec2462008-08-16 03:19:19 +00001503 // FIXME: Why isn't ImplicitParamDecl a ParmVarDecl?
Sanjiv Gupta31fc07d2008-10-31 09:52:39 +00001504 assert((isa<ParmVarDecl>(D) || isa<ImplicitParamDecl>(D)) &&
Daniel Dunbarb7ec2462008-08-16 03:19:19 +00001505 "Invalid argument to EmitParmDecl");
John McCall8178df32011-02-22 22:38:33 +00001506
1507 Arg->setName(D.getName());
1508
1509 // Use better IR generation for certain implicit parameters.
1510 if (isa<ImplicitParamDecl>(D)) {
1511 // The only implicit argument a block has is its literal.
1512 if (BlockInfo) {
1513 LocalDeclMap[&D] = Arg;
1514
1515 if (CGDebugInfo *DI = getDebugInfo()) {
Douglas Gregor4cdad312012-10-23 20:05:01 +00001516 if (CGM.getCodeGenOpts().getDebugInfo()
1517 >= CodeGenOptions::LimitedDebugInfo) {
Alexey Samsonovfd00eec2012-05-04 07:39:27 +00001518 DI->setLocation(D.getLocation());
1519 DI->EmitDeclareOfBlockLiteralArgVariable(*BlockInfo, Arg, Builder);
1520 }
John McCall8178df32011-02-22 22:38:33 +00001521 }
1522
1523 return;
1524 }
1525 }
1526
Chris Lattner8bcfc5b2008-04-06 23:10:54 +00001527 QualType Ty = D.getType();
Mike Stump1eb44332009-09-09 15:08:12 +00001528
Reid Spencer5f016e22007-07-11 17:01:13 +00001529 llvm::Value *DeclPtr;
Daniel Dunbare86bcf02010-02-08 22:53:07 +00001530 // If this is an aggregate or variable sized value, reuse the input pointer.
1531 if (!Ty->isConstantSizeType() ||
John McCall9d232c82013-03-07 21:37:08 +00001532 !CodeGenFunction::hasScalarEvaluationKind(Ty)) {
Reid Spencer5f016e22007-07-11 17:01:13 +00001533 DeclPtr = Arg;
Reid Spencer5f016e22007-07-11 17:01:13 +00001534 } else {
Daniel Dunbare86bcf02010-02-08 22:53:07 +00001535 // Otherwise, create a temporary to hold the value.
Eli Friedmanddfb8d12011-11-03 20:31:28 +00001536 llvm::AllocaInst *Alloc = CreateTempAlloca(ConvertTypeForMem(Ty),
1537 D.getName() + ".addr");
Fariborz Jahanian41a6a3e2013-02-21 00:40:10 +00001538 CharUnits Align = getContext().getDeclAlign(&D);
1539 Alloc->setAlignment(Align.getQuantity());
Eli Friedmanddfb8d12011-11-03 20:31:28 +00001540 DeclPtr = Alloc;
Mike Stump1eb44332009-09-09 15:08:12 +00001541
John McCallf85e1932011-06-15 23:02:42 +00001542 bool doStore = true;
1543
1544 Qualifiers qs = Ty.getQualifiers();
Fariborz Jahanian41a6a3e2013-02-21 00:40:10 +00001545 LValue lv = MakeAddrLValue(DeclPtr, Ty, Align);
John McCallf85e1932011-06-15 23:02:42 +00001546 if (Qualifiers::ObjCLifetime lt = qs.getObjCLifetime()) {
1547 // We honor __attribute__((ns_consumed)) for types with lifetime.
1548 // For __strong, it's handled by just skipping the initial retain;
1549 // otherwise we have to balance out the initial +1 with an extra
1550 // cleanup to do the release at the end of the function.
1551 bool isConsumed = D.hasAttr<NSConsumedAttr>();
1552
1553 // 'self' is always formally __strong, but if this is not an
1554 // init method then we don't want to retain it.
John McCall7acddac2011-06-17 06:42:21 +00001555 if (D.isARCPseudoStrong()) {
John McCallf85e1932011-06-15 23:02:42 +00001556 const ObjCMethodDecl *method = cast<ObjCMethodDecl>(CurCodeDecl);
1557 assert(&D == method->getSelfDecl());
John McCall7acddac2011-06-17 06:42:21 +00001558 assert(lt == Qualifiers::OCL_Strong);
1559 assert(qs.hasConst());
John McCallf85e1932011-06-15 23:02:42 +00001560 assert(method->getMethodFamily() != OMF_init);
John McCall175d6592011-06-15 23:40:09 +00001561 (void) method;
John McCallf85e1932011-06-15 23:02:42 +00001562 lt = Qualifiers::OCL_ExplicitNone;
1563 }
1564
1565 if (lt == Qualifiers::OCL_Strong) {
Fariborz Jahanian41a6a3e2013-02-21 00:40:10 +00001566 if (!isConsumed) {
1567 if (CGM.getCodeGenOpts().OptimizationLevel == 0) {
1568 // use objc_storeStrong(&dest, value) for retaining the
1569 // object. But first, store a null into 'dest' because
1570 // objc_storeStrong attempts to release its old value.
1571 llvm::Value * Null = CGM.EmitNullConstant(D.getType());
1572 EmitStoreOfScalar(Null, lv, /* isInitialization */ true);
1573 EmitARCStoreStrongCall(lv.getAddress(), Arg, true);
1574 doStore = false;
1575 }
1576 else
John McCallf85e1932011-06-15 23:02:42 +00001577 // Don't use objc_retainBlock for block pointers, because we
1578 // don't want to Block_copy something just because we got it
1579 // as a parameter.
Fariborz Jahanian41a6a3e2013-02-21 00:40:10 +00001580 Arg = EmitARCRetainNonBlock(Arg);
1581 }
John McCallf85e1932011-06-15 23:02:42 +00001582 } else {
1583 // Push the cleanup for a consumed parameter.
1584 if (isConsumed)
1585 EHStack.pushCleanup<ConsumeARCParameter>(getARCCleanupKind(), Arg);
1586
1587 if (lt == Qualifiers::OCL_Weak) {
1588 EmitARCInitWeak(DeclPtr, Arg);
Chad Rosier7acebfb2012-02-18 01:20:35 +00001589 doStore = false; // The weak init is a store, no need to do two.
John McCallf85e1932011-06-15 23:02:42 +00001590 }
1591 }
1592
1593 // Enter the cleanup scope.
1594 EmitAutoVarWithLifetime(*this, D, DeclPtr, lt);
1595 }
1596
Daniel Dunbare86bcf02010-02-08 22:53:07 +00001597 // Store the initial value into the alloca.
Fariborz Jahanian41a6a3e2013-02-21 00:40:10 +00001598 if (doStore)
David Chisnall7a7ee302012-01-16 17:27:18 +00001599 EmitStoreOfScalar(Arg, lv, /* isInitialization */ true);
Reid Spencer5f016e22007-07-11 17:01:13 +00001600 }
1601
1602 llvm::Value *&DMEntry = LocalDeclMap[&D];
1603 assert(DMEntry == 0 && "Decl already exists in localdeclmap!");
1604 DMEntry = DeclPtr;
Sanjiv Guptacc9b1632008-05-30 10:30:31 +00001605
1606 // Emit debug info for param declaration.
Alexey Samsonovfd00eec2012-05-04 07:39:27 +00001607 if (CGDebugInfo *DI = getDebugInfo()) {
Douglas Gregor4cdad312012-10-23 20:05:01 +00001608 if (CGM.getCodeGenOpts().getDebugInfo()
1609 >= CodeGenOptions::LimitedDebugInfo) {
Alexey Samsonovfd00eec2012-05-04 07:39:27 +00001610 DI->EmitDeclareOfArgVariable(&D, DeclPtr, ArgNo, Builder);
1611 }
1612 }
Julien Lerouge77f68bb2011-09-09 22:41:49 +00001613
1614 if (D.hasAttr<AnnotateAttr>())
1615 EmitVarAnnotations(&D, DeclPtr);
Reid Spencer5f016e22007-07-11 17:01:13 +00001616}