Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 1 | //===--- CGDecl.cpp - Emit LLVM Code for declarations ---------------------===// |
| 2 | // |
| 3 | // The LLVM Compiler Infrastructure |
| 4 | // |
Chris Lattner | 0bc735f | 2007-12-29 19:59:25 +0000 | [diff] [blame] | 5 | // This file is distributed under the University of Illinois Open Source |
| 6 | // License. See LICENSE.TXT for details. |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 7 | // |
| 8 | //===----------------------------------------------------------------------===// |
| 9 | // |
| 10 | // This contains code to emit Decl nodes as LLVM code. |
| 11 | // |
| 12 | //===----------------------------------------------------------------------===// |
| 13 | |
Sanjiv Gupta | cc9b163 | 2008-05-30 10:30:31 +0000 | [diff] [blame] | 14 | #include "CGDebugInfo.h" |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 15 | #include "CodeGenFunction.h" |
Anders Carlsson | 1a86b33 | 2007-10-17 00:52:43 +0000 | [diff] [blame] | 16 | #include "CodeGenModule.h" |
Daniel Dunbar | de7fb84 | 2008-08-11 05:00:27 +0000 | [diff] [blame] | 17 | #include "clang/AST/ASTContext.h" |
Daniel Dunbar | c4a1dea | 2008-08-11 05:35:13 +0000 | [diff] [blame] | 18 | #include "clang/AST/Decl.h" |
Anders Carlsson | 19567ee | 2008-08-25 01:38:19 +0000 | [diff] [blame] | 19 | #include "clang/AST/DeclObjC.h" |
Nate Begeman | 8bd4afe | 2008-04-19 04:17:09 +0000 | [diff] [blame] | 20 | #include "clang/Basic/SourceManager.h" |
Chris Lattner | 2621fd1 | 2008-05-08 05:58:21 +0000 | [diff] [blame] | 21 | #include "clang/Basic/TargetInfo.h" |
Anders Carlsson | 1a86b33 | 2007-10-17 00:52:43 +0000 | [diff] [blame] | 22 | #include "llvm/GlobalVariable.h" |
Anders Carlsson | 5d46315 | 2008-12-12 07:38:43 +0000 | [diff] [blame] | 23 | #include "llvm/Intrinsics.h" |
Mike Stump | dab514f | 2009-03-04 03:23:46 +0000 | [diff] [blame] | 24 | #include "llvm/Target/TargetData.h" |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 25 | #include "llvm/Type.h" |
| 26 | using namespace clang; |
| 27 | using namespace CodeGen; |
| 28 | |
| 29 | |
| 30 | void CodeGenFunction::EmitDecl(const Decl &D) { |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 31 | switch (D.getKind()) { |
| 32 | default: assert(0 && "Unknown decl kind!"); |
Chris Lattner | aa9fc46 | 2007-10-08 21:37:32 +0000 | [diff] [blame] | 33 | case Decl::ParmVar: |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 34 | assert(0 && "Parmdecls should not be in declstmts!"); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 35 | case Decl::Function: // void X(); |
Argyrios Kyrtzidis | 35bc082 | 2008-10-15 00:42:39 +0000 | [diff] [blame] | 36 | case Decl::Record: // struct/union/class X; |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 37 | case Decl::Enum: // enum X; |
Daniel Dunbar | 662174c8 | 2008-08-29 17:28:43 +0000 | [diff] [blame] | 38 | case Decl::EnumConstant: // enum ? { X = ? } |
Argyrios Kyrtzidis | 35bc082 | 2008-10-15 00:42:39 +0000 | [diff] [blame] | 39 | case Decl::CXXRecord: // struct/union/class X; [C++] |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 40 | // None of these decls require codegen support. |
| 41 | return; |
| 42 | |
Daniel Dunbar | 662174c8 | 2008-08-29 17:28:43 +0000 | [diff] [blame] | 43 | case Decl::Var: { |
| 44 | const VarDecl &VD = cast<VarDecl>(D); |
| 45 | assert(VD.isBlockVarDecl() && |
| 46 | "Should not see file-scope variables inside a function!"); |
| 47 | return EmitBlockVarDecl(VD); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 48 | } |
Anders Carlsson | fcdbb93 | 2008-12-20 21:51:53 +0000 | [diff] [blame] | 49 | |
| 50 | case Decl::Typedef: { // typedef int X; |
| 51 | const TypedefDecl &TD = cast<TypedefDecl>(D); |
| 52 | QualType Ty = TD.getUnderlyingType(); |
| 53 | |
| 54 | if (Ty->isVariablyModifiedType()) |
| 55 | EmitVLASize(Ty); |
| 56 | } |
Daniel Dunbar | 662174c8 | 2008-08-29 17:28:43 +0000 | [diff] [blame] | 57 | } |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 58 | } |
| 59 | |
| 60 | /// EmitBlockVarDecl - This method handles emission of any variable declaration |
| 61 | /// inside a function, including static vars etc. |
Steve Naroff | 248a753 | 2008-04-15 22:42:06 +0000 | [diff] [blame] | 62 | void CodeGenFunction::EmitBlockVarDecl(const VarDecl &D) { |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 63 | switch (D.getStorageClass()) { |
| 64 | case VarDecl::Static: |
Anders Carlsson | 1a86b33 | 2007-10-17 00:52:43 +0000 | [diff] [blame] | 65 | return EmitStaticBlockVarDecl(D); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 66 | case VarDecl::Extern: |
Lauro Ramos Venancio | fea90b8 | 2008-02-16 22:30:38 +0000 | [diff] [blame] | 67 | // Don't emit it now, allow it to be emitted lazily on its first use. |
| 68 | return; |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 69 | default: |
| 70 | assert((D.getStorageClass() == VarDecl::None || |
| 71 | D.getStorageClass() == VarDecl::Auto || |
| 72 | D.getStorageClass() == VarDecl::Register) && |
| 73 | "Unknown storage class"); |
| 74 | return EmitLocalBlockVarDecl(D); |
| 75 | } |
| 76 | } |
| 77 | |
Daniel Dunbar | 0096acf | 2009-02-25 19:24:29 +0000 | [diff] [blame] | 78 | llvm::GlobalVariable * |
| 79 | CodeGenFunction::CreateStaticBlockVarDecl(const VarDecl &D, |
| 80 | const char *Separator, |
| 81 | llvm::GlobalValue::LinkageTypes |
| 82 | Linkage) { |
Chris Lattner | 8bcfc5b | 2008-04-06 23:10:54 +0000 | [diff] [blame] | 83 | QualType Ty = D.getType(); |
Eli Friedman | 3c2b317 | 2008-02-15 12:20:59 +0000 | [diff] [blame] | 84 | assert(Ty->isConstantSizeType() && "VLAs can't be static"); |
Nate Begeman | 8bd4afe | 2008-04-19 04:17:09 +0000 | [diff] [blame] | 85 | |
Chris Lattner | 352ffde2 | 2008-02-06 04:54:32 +0000 | [diff] [blame] | 86 | std::string ContextName; |
Anders Carlsson | 19567ee | 2008-08-25 01:38:19 +0000 | [diff] [blame] | 87 | if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(CurFuncDecl)) |
Douglas Gregor | 6ec3668 | 2009-02-18 23:53:56 +0000 | [diff] [blame] | 88 | ContextName = CGM.getMangledName(FD); |
Anders Carlsson | 19567ee | 2008-08-25 01:38:19 +0000 | [diff] [blame] | 89 | else if (isa<ObjCMethodDecl>(CurFuncDecl)) |
| 90 | ContextName = std::string(CurFn->getNameStart(), |
| 91 | CurFn->getNameStart() + CurFn->getNameLen()); |
Mike Stump | a99038c | 2009-02-28 09:07:16 +0000 | [diff] [blame] | 92 | else if (isa<BlockDecl>(CurFuncDecl)) |
| 93 | // FIXME: We want to traverse up and pick a name based upon where we came |
| 94 | // from. |
| 95 | ContextName = "block"; |
Chris Lattner | 352ffde2 | 2008-02-06 04:54:32 +0000 | [diff] [blame] | 96 | else |
Anders Carlsson | 19567ee | 2008-08-25 01:38:19 +0000 | [diff] [blame] | 97 | assert(0 && "Unknown context for block var decl"); |
Nate Begeman | 8bd4afe | 2008-04-19 04:17:09 +0000 | [diff] [blame] | 98 | |
Daniel Dunbar | 0096acf | 2009-02-25 19:24:29 +0000 | [diff] [blame] | 99 | const llvm::Type *LTy = CGM.getTypes().ConvertTypeForMem(Ty); |
| 100 | return new llvm::GlobalVariable(LTy, Ty.isConstant(getContext()), Linkage, |
| 101 | llvm::Constant::getNullValue(LTy), |
| 102 | ContextName + Separator + D.getNameAsString(), |
| 103 | &CGM.getModule(), 0, Ty.getAddressSpace()); |
| 104 | } |
| 105 | |
Daniel Dunbar | a985b31 | 2009-02-25 19:45:19 +0000 | [diff] [blame] | 106 | void CodeGenFunction::EmitStaticBlockVarDecl(const VarDecl &D) { |
Daniel Dunbar | 0096acf | 2009-02-25 19:24:29 +0000 | [diff] [blame] | 107 | |
Daniel Dunbar | a985b31 | 2009-02-25 19:45:19 +0000 | [diff] [blame] | 108 | llvm::Value *&DMEntry = LocalDeclMap[&D]; |
| 109 | assert(DMEntry == 0 && "Decl already exists in localdeclmap!"); |
| 110 | |
| 111 | llvm::GlobalVariable *GV = |
| 112 | CreateStaticBlockVarDecl(D, ".", llvm::GlobalValue::InternalLinkage); |
| 113 | |
Daniel Dunbar | e5731f8 | 2009-02-25 20:08:33 +0000 | [diff] [blame] | 114 | // Store into LocalDeclMap before generating initializer to handle |
| 115 | // circular references. |
| 116 | DMEntry = GV; |
| 117 | |
Daniel Dunbar | a985b31 | 2009-02-25 19:45:19 +0000 | [diff] [blame] | 118 | if (D.getInit()) { |
Daniel Dunbar | 0096acf | 2009-02-25 19:24:29 +0000 | [diff] [blame] | 119 | llvm::Constant *Init = CGM.EmitConstantExpr(D.getInit(), this); |
| 120 | |
| 121 | // If constant emission failed, then this should be a C++ static |
| 122 | // initializer. |
| 123 | if (!Init) { |
| 124 | if (!getContext().getLangOptions().CPlusPlus) |
| 125 | CGM.ErrorUnsupported(D.getInit(), "constant l-value expression"); |
| 126 | else |
| 127 | GenerateStaticCXXBlockVarDeclInit(D, GV); |
| 128 | } else { |
| 129 | // The initializer may differ in type from the global. Rewrite |
Eli Friedman | 074dda6 | 2009-03-04 04:22:58 +0000 | [diff] [blame] | 130 | // the global to match the initializer. (We have to do this |
| 131 | // because some types, like unions, can't be completely represented |
| 132 | // in the LLVM type system.) |
Daniel Dunbar | 0096acf | 2009-02-25 19:24:29 +0000 | [diff] [blame] | 133 | if (GV->getType() != Init->getType()) { |
| 134 | llvm::GlobalVariable *OldGV = GV; |
| 135 | |
| 136 | GV = new llvm::GlobalVariable(Init->getType(), OldGV->isConstant(), |
| 137 | OldGV->getLinkage(), Init, "", |
| 138 | &CGM.getModule(), 0, |
| 139 | D.getType().getAddressSpace()); |
| 140 | |
| 141 | // Steal the name of the old global |
| 142 | GV->takeName(OldGV); |
| 143 | |
| 144 | // Replace all uses of the old global with the new global |
| 145 | llvm::Constant *NewPtrForOldDecl = |
| 146 | llvm::ConstantExpr::getBitCast(GV, OldGV->getType()); |
| 147 | OldGV->replaceAllUsesWith(NewPtrForOldDecl); |
| 148 | |
| 149 | // Erase the old global, since it is no longer used. |
| 150 | OldGV->eraseFromParent(); |
| 151 | } |
| 152 | |
| 153 | GV->setInitializer(Init); |
| 154 | } |
| 155 | } |
Nate Begeman | 8bd4afe | 2008-04-19 04:17:09 +0000 | [diff] [blame] | 156 | |
Daniel Dunbar | 30510ab | 2009-02-12 23:32:54 +0000 | [diff] [blame] | 157 | // FIXME: Merge attribute handling. |
Nate Begeman | 8bd4afe | 2008-04-19 04:17:09 +0000 | [diff] [blame] | 158 | if (const AnnotateAttr *AA = D.getAttr<AnnotateAttr>()) { |
| 159 | SourceManager &SM = CGM.getContext().getSourceManager(); |
| 160 | llvm::Constant *Ann = |
Chris Lattner | f7cf85b | 2009-01-16 07:36:28 +0000 | [diff] [blame] | 161 | CGM.EmitAnnotateAttr(GV, AA, |
| 162 | SM.getInstantiationLineNumber(D.getLocation())); |
Nate Begeman | 8bd4afe | 2008-04-19 04:17:09 +0000 | [diff] [blame] | 163 | CGM.AddAnnotation(Ann); |
| 164 | } |
| 165 | |
Daniel Dunbar | 30510ab | 2009-02-12 23:32:54 +0000 | [diff] [blame] | 166 | if (const SectionAttr *SA = D.getAttr<SectionAttr>()) |
| 167 | GV->setSection(SA->getName()); |
| 168 | |
Daniel Dunbar | 5c61d97 | 2009-02-13 22:08:43 +0000 | [diff] [blame] | 169 | if (D.getAttr<UsedAttr>()) |
| 170 | CGM.AddUsedGlobal(GV); |
| 171 | |
Daniel Dunbar | e5731f8 | 2009-02-25 20:08:33 +0000 | [diff] [blame] | 172 | // We may have to cast the constant because of the initializer |
| 173 | // mismatch above. |
| 174 | // |
| 175 | // FIXME: It is really dangerous to store this in the map; if anyone |
| 176 | // RAUW's the GV uses of this constant will be invalid. |
Eli Friedman | 2659052 | 2008-06-08 01:23:18 +0000 | [diff] [blame] | 177 | const llvm::Type *LTy = CGM.getTypes().ConvertTypeForMem(D.getType()); |
| 178 | const llvm::Type *LPtrTy = |
| 179 | llvm::PointerType::get(LTy, D.getType().getAddressSpace()); |
| 180 | DMEntry = llvm::ConstantExpr::getBitCast(GV, LPtrTy); |
Sanjiv Gupta | 686226b | 2008-06-05 08:59:10 +0000 | [diff] [blame] | 181 | |
| 182 | // Emit global variable debug descriptor for static vars. |
Anders Carlsson | e896d98 | 2009-02-13 08:11:52 +0000 | [diff] [blame] | 183 | CGDebugInfo *DI = getDebugInfo(); |
Mike Stump | 4451bd9 | 2009-02-20 00:19:45 +0000 | [diff] [blame] | 184 | if (DI) { |
Daniel Dunbar | 66031a5 | 2008-10-17 16:15:48 +0000 | [diff] [blame] | 185 | DI->setLocation(D.getLocation()); |
Sanjiv Gupta | 686226b | 2008-06-05 08:59:10 +0000 | [diff] [blame] | 186 | DI->EmitGlobalVariable(static_cast<llvm::GlobalVariable *>(GV), &D); |
| 187 | } |
Anders Carlsson | 1a86b33 | 2007-10-17 00:52:43 +0000 | [diff] [blame] | 188 | } |
| 189 | |
Mike Stump | dab514f | 2009-03-04 03:23:46 +0000 | [diff] [blame] | 190 | /// BuildByRefType - This routine changes a __block variable declared as T x |
| 191 | /// into: |
| 192 | /// |
| 193 | /// struct { |
| 194 | /// void *__isa; |
| 195 | /// void *__forwarding; |
| 196 | /// int32_t __flags; |
| 197 | /// int32_t __size; |
| 198 | /// void *__copy_helper; |
| 199 | /// void *__destroy_helper; |
| 200 | /// T x; |
| 201 | /// } x |
| 202 | /// |
| 203 | /// Align is the alignment needed in bytes for x. |
| 204 | const llvm::Type *CodeGenFunction::BuildByRefType(QualType Ty, |
| 205 | uint64_t Align) { |
| 206 | const llvm::Type *LTy = ConvertType(Ty); |
| 207 | bool needsCopyDispose = BlockRequiresCopying(Ty); |
| 208 | std::vector<const llvm::Type *> Types(needsCopyDispose*2+5); |
| 209 | const llvm::PointerType *PtrToInt8Ty |
| 210 | = llvm::PointerType::getUnqual(llvm::Type::Int8Ty); |
| 211 | Types[0] = PtrToInt8Ty; |
| 212 | Types[1] = PtrToInt8Ty; |
| 213 | Types[2] = llvm::Type::Int32Ty; |
| 214 | Types[3] = llvm::Type::Int32Ty; |
| 215 | if (needsCopyDispose) { |
| 216 | Types[4] = PtrToInt8Ty; |
| 217 | Types[5] = PtrToInt8Ty; |
| 218 | } |
| 219 | // FIXME: Align this on at least an Align boundary. |
| 220 | Types[needsCopyDispose*2 + 4] = LTy; |
| 221 | return llvm::StructType::get(Types, false); |
| 222 | } |
| 223 | |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 224 | /// EmitLocalBlockVarDecl - Emit code and set up an entry in LocalDeclMap for a |
| 225 | /// variable declaration with auto, register, or no storage class specifier. |
Chris Lattner | 2621fd1 | 2008-05-08 05:58:21 +0000 | [diff] [blame] | 226 | /// These turn into simple stack objects, or GlobalValues depending on target. |
Steve Naroff | 248a753 | 2008-04-15 22:42:06 +0000 | [diff] [blame] | 227 | void CodeGenFunction::EmitLocalBlockVarDecl(const VarDecl &D) { |
Chris Lattner | 8bcfc5b | 2008-04-06 23:10:54 +0000 | [diff] [blame] | 228 | QualType Ty = D.getType(); |
Mike Stump | dab514f | 2009-03-04 03:23:46 +0000 | [diff] [blame] | 229 | bool isByRef = D.getAttr<BlocksAttr>(); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 230 | |
| 231 | llvm::Value *DeclPtr; |
Eli Friedman | 3c2b317 | 2008-02-15 12:20:59 +0000 | [diff] [blame] | 232 | if (Ty->isConstantSizeType()) { |
Chris Lattner | 2621fd1 | 2008-05-08 05:58:21 +0000 | [diff] [blame] | 233 | if (!Target.useGlobalsForAutomaticVariables()) { |
| 234 | // A normal fixed sized variable becomes an alloca in the entry block. |
Eli Friedman | a3460ac | 2009-03-04 04:25:14 +0000 | [diff] [blame^] | 235 | const llvm::Type *LTy = ConvertTypeForMem(Ty); |
Mike Stump | dab514f | 2009-03-04 03:23:46 +0000 | [diff] [blame] | 236 | if (isByRef) |
| 237 | LTy = BuildByRefType(Ty, getContext().getDeclAlignInBytes(&D)); |
Chris Lattner | 8ec03f5 | 2008-11-24 03:54:41 +0000 | [diff] [blame] | 238 | llvm::AllocaInst *Alloc = |
Douglas Gregor | 6ec3668 | 2009-02-18 23:53:56 +0000 | [diff] [blame] | 239 | CreateTempAlloca(LTy, CGM.getMangledName(&D)); |
Mike Stump | dab514f | 2009-03-04 03:23:46 +0000 | [diff] [blame] | 240 | if (isByRef) |
| 241 | Alloc->setAlignment(std::max(getContext().getDeclAlignInBytes(&D), |
| 242 | getContext().getTypeAlign(getContext().VoidPtrTy) / 8)); |
| 243 | else |
| 244 | Alloc->setAlignment(getContext().getDeclAlignInBytes(&D)); |
Eli Friedman | 77eedd6 | 2008-05-31 21:20:41 +0000 | [diff] [blame] | 245 | DeclPtr = Alloc; |
Chris Lattner | 2621fd1 | 2008-05-08 05:58:21 +0000 | [diff] [blame] | 246 | } else { |
| 247 | // Targets that don't support recursion emit locals as globals. |
| 248 | const char *Class = |
| 249 | D.getStorageClass() == VarDecl::Register ? ".reg." : ".auto."; |
Daniel Dunbar | a985b31 | 2009-02-25 19:45:19 +0000 | [diff] [blame] | 250 | DeclPtr = CreateStaticBlockVarDecl(D, Class, |
| 251 | llvm::GlobalValue |
| 252 | ::InternalLinkage); |
Chris Lattner | 2621fd1 | 2008-05-08 05:58:21 +0000 | [diff] [blame] | 253 | } |
Anders Carlsson | 60d3541 | 2008-12-20 20:46:34 +0000 | [diff] [blame] | 254 | |
| 255 | if (Ty->isVariablyModifiedType()) |
| 256 | EmitVLASize(Ty); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 257 | } else { |
Anders Carlsson | 5ecb1b9 | 2009-02-09 20:41:50 +0000 | [diff] [blame] | 258 | if (!DidCallStackSave) { |
Anders Carlsson | 5d46315 | 2008-12-12 07:38:43 +0000 | [diff] [blame] | 259 | // Save the stack. |
| 260 | const llvm::Type *LTy = llvm::PointerType::getUnqual(llvm::Type::Int8Ty); |
| 261 | llvm::Value *Stack = CreateTempAlloca(LTy, "saved_stack"); |
| 262 | |
| 263 | llvm::Value *F = CGM.getIntrinsic(llvm::Intrinsic::stacksave); |
| 264 | llvm::Value *V = Builder.CreateCall(F); |
| 265 | |
| 266 | Builder.CreateStore(V, Stack); |
Anders Carlsson | 5ecb1b9 | 2009-02-09 20:41:50 +0000 | [diff] [blame] | 267 | |
| 268 | DidCallStackSave = true; |
Anders Carlsson | 5d46315 | 2008-12-12 07:38:43 +0000 | [diff] [blame] | 269 | |
Anders Carlsson | 5ecb1b9 | 2009-02-09 20:41:50 +0000 | [diff] [blame] | 270 | { |
| 271 | // Push a cleanup block and restore the stack there. |
| 272 | CleanupScope scope(*this); |
| 273 | |
| 274 | V = Builder.CreateLoad(Stack, "tmp"); |
| 275 | llvm::Value *F = CGM.getIntrinsic(llvm::Intrinsic::stackrestore); |
| 276 | Builder.CreateCall(F, V); |
| 277 | } |
Anders Carlsson | 5d46315 | 2008-12-12 07:38:43 +0000 | [diff] [blame] | 278 | } |
Anders Carlsson | 5ecb1b9 | 2009-02-09 20:41:50 +0000 | [diff] [blame] | 279 | |
Anders Carlsson | 5d46315 | 2008-12-12 07:38:43 +0000 | [diff] [blame] | 280 | // Get the element type. |
Eli Friedman | a3460ac | 2009-03-04 04:25:14 +0000 | [diff] [blame^] | 281 | const llvm::Type *LElemTy = ConvertTypeForMem(Ty); |
Anders Carlsson | 5d46315 | 2008-12-12 07:38:43 +0000 | [diff] [blame] | 282 | const llvm::Type *LElemPtrTy = |
| 283 | llvm::PointerType::get(LElemTy, D.getType().getAddressSpace()); |
| 284 | |
Anders Carlsson | 60d3541 | 2008-12-20 20:46:34 +0000 | [diff] [blame] | 285 | llvm::Value *VLASize = EmitVLASize(Ty); |
Anders Carlsson | 5d46315 | 2008-12-12 07:38:43 +0000 | [diff] [blame] | 286 | |
Anders Carlsson | 96f2147 | 2009-02-05 19:43:10 +0000 | [diff] [blame] | 287 | // Downcast the VLA size expression |
| 288 | VLASize = Builder.CreateIntCast(VLASize, llvm::Type::Int32Ty, false, "tmp"); |
| 289 | |
Anders Carlsson | 5d46315 | 2008-12-12 07:38:43 +0000 | [diff] [blame] | 290 | // Allocate memory for the array. |
| 291 | llvm::Value *VLA = Builder.CreateAlloca(llvm::Type::Int8Ty, VLASize, "vla"); |
Eli Friedman | 8f39f5e | 2008-12-20 23:11:59 +0000 | [diff] [blame] | 292 | DeclPtr = Builder.CreateBitCast(VLA, LElemPtrTy, "tmp"); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 293 | } |
Eli Friedman | 8f39f5e | 2008-12-20 23:11:59 +0000 | [diff] [blame] | 294 | |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 295 | llvm::Value *&DMEntry = LocalDeclMap[&D]; |
| 296 | assert(DMEntry == 0 && "Decl already exists in localdeclmap!"); |
| 297 | DMEntry = DeclPtr; |
Sanjiv Gupta | cc9b163 | 2008-05-30 10:30:31 +0000 | [diff] [blame] | 298 | |
| 299 | // Emit debug info for local var declaration. |
Anders Carlsson | e896d98 | 2009-02-13 08:11:52 +0000 | [diff] [blame] | 300 | if (CGDebugInfo *DI = getDebugInfo()) { |
Daniel Dunbar | 66031a5 | 2008-10-17 16:15:48 +0000 | [diff] [blame] | 301 | DI->setLocation(D.getLocation()); |
Mike Stump | dab514f | 2009-03-04 03:23:46 +0000 | [diff] [blame] | 302 | if (isByRef) { |
| 303 | llvm::Value *Loc; |
| 304 | bool needsCopyDispose = BlockRequiresCopying(Ty); |
| 305 | // FIXME: I think we need to indirect through the forwarding pointer first |
| 306 | Loc = Builder.CreateStructGEP(DeclPtr, needsCopyDispose*2+4, "x"); |
| 307 | DI->EmitDeclareOfAutoVariable(&D, Loc, Builder); |
| 308 | } else |
| 309 | DI->EmitDeclareOfAutoVariable(&D, DeclPtr, Builder); |
Sanjiv Gupta | cc9b163 | 2008-05-30 10:30:31 +0000 | [diff] [blame] | 310 | } |
| 311 | |
Chris Lattner | 1978596 | 2007-07-12 00:39:48 +0000 | [diff] [blame] | 312 | // If this local has an initializer, emit it now. |
Chris Lattner | 7f02f72 | 2007-08-24 05:35:26 +0000 | [diff] [blame] | 313 | if (const Expr *Init = D.getInit()) { |
Mike Stump | dab514f | 2009-03-04 03:23:46 +0000 | [diff] [blame] | 314 | llvm::Value *Loc = DeclPtr; |
| 315 | if (isByRef) { |
| 316 | bool needsCopyDispose = BlockRequiresCopying(Ty); |
| 317 | Loc = Builder.CreateStructGEP(DeclPtr, needsCopyDispose*2+4, "x"); |
| 318 | } |
Chris Lattner | d31beb1 | 2007-08-26 07:29:23 +0000 | [diff] [blame] | 319 | if (!hasAggregateLLVMType(Init->getType())) { |
| 320 | llvm::Value *V = EmitScalarExpr(Init); |
Eli Friedman | a3460ac | 2009-03-04 04:25:14 +0000 | [diff] [blame^] | 321 | EmitStoreOfScalar(V, Loc, D.getType().isVolatileQualified()); |
Chris Lattner | 9b2dc28 | 2008-04-04 16:54:41 +0000 | [diff] [blame] | 322 | } else if (Init->getType()->isAnyComplexType()) { |
Mike Stump | dab514f | 2009-03-04 03:23:46 +0000 | [diff] [blame] | 323 | EmitComplexExprIntoAddr(Init, Loc, D.getType().isVolatileQualified()); |
Chris Lattner | 9a19edf | 2007-08-26 05:13:54 +0000 | [diff] [blame] | 324 | } else { |
Mike Stump | dab514f | 2009-03-04 03:23:46 +0000 | [diff] [blame] | 325 | EmitAggExpr(Init, Loc, D.getType().isVolatileQualified()); |
| 326 | } |
| 327 | } |
| 328 | if (isByRef) { |
| 329 | const llvm::PointerType *PtrToInt8Ty |
| 330 | = llvm::PointerType::getUnqual(llvm::Type::Int8Ty); |
| 331 | |
| 332 | llvm::Value *isa_field = Builder.CreateStructGEP(DeclPtr, 0); |
| 333 | llvm::Value *forwarding_field = Builder.CreateStructGEP(DeclPtr, 1); |
| 334 | llvm::Value *flags_field = Builder.CreateStructGEP(DeclPtr, 2); |
| 335 | llvm::Value *size_field = Builder.CreateStructGEP(DeclPtr, 3); |
| 336 | llvm::Value *V; |
| 337 | int flag = 0; |
| 338 | int flags = 0; |
| 339 | |
| 340 | if (Ty->isBlockPointerType()) { |
| 341 | flag |= BLOCK_FIELD_IS_BLOCK; |
| 342 | flags |= BLOCK_HAS_COPY_DISPOSE; |
| 343 | } else if (BlockRequiresCopying(Ty)) { |
| 344 | flags |= BLOCK_HAS_COPY_DISPOSE; |
| 345 | flag |= BLOCK_FIELD_IS_OBJECT; |
| 346 | } |
| 347 | // FIXME: Need to set BLOCK_FIELD_IS_WEAK as appropriate. |
| 348 | |
| 349 | int isa = 0; |
| 350 | if (flag&BLOCK_FIELD_IS_WEAK) |
| 351 | isa = 1; |
| 352 | V = llvm::ConstantInt::get(llvm::Type::Int32Ty, isa); |
| 353 | V = Builder.CreateIntToPtr(V, PtrToInt8Ty, "tmp"); |
| 354 | Builder.CreateStore(V, isa_field); |
| 355 | |
| 356 | V = Builder.CreateBitCast(DeclPtr, PtrToInt8Ty, "tmp"); |
| 357 | Builder.CreateStore(V, forwarding_field); |
| 358 | |
| 359 | V = llvm::ConstantInt::get(llvm::Type::Int32Ty, flags); |
| 360 | Builder.CreateStore(V, flags_field); |
| 361 | |
| 362 | const llvm::Type *V1 = cast<llvm::PointerType>(DeclPtr->getType())->getElementType(); |
| 363 | V = llvm::ConstantInt::get(llvm::Type::Int32Ty, CGM.getTargetData().getTypeStoreSizeInBits(V1) / 8); |
| 364 | Builder.CreateStore(V, size_field); |
| 365 | |
| 366 | if (flags & BLOCK_HAS_COPY_DISPOSE) { |
| 367 | llvm::Value *copy_helper = Builder.CreateStructGEP(DeclPtr, 4); |
| 368 | llvm::Value *destroy_helper = Builder.CreateStructGEP(DeclPtr, 5); |
| 369 | |
| 370 | Builder.CreateStore(BuildCopyHelper(flag), copy_helper); |
| 371 | |
| 372 | Builder.CreateStore(BuildDestroyHelper(flag), destroy_helper); |
Chris Lattner | 9a19edf | 2007-08-26 05:13:54 +0000 | [diff] [blame] | 373 | } |
Chris Lattner | 7f02f72 | 2007-08-24 05:35:26 +0000 | [diff] [blame] | 374 | } |
Anders Carlsson | 69c68b7 | 2009-02-07 23:51:38 +0000 | [diff] [blame] | 375 | |
| 376 | // Handle the cleanup attribute |
| 377 | if (const CleanupAttr *CA = D.getAttr<CleanupAttr>()) { |
| 378 | const FunctionDecl *FD = CA->getFunctionDecl(); |
| 379 | |
| 380 | llvm::Constant* F = CGM.GetAddrOfFunction(FD); |
| 381 | assert(F && "Could not find function!"); |
| 382 | |
| 383 | CleanupScope scope(*this); |
| 384 | |
| 385 | CallArgList Args; |
| 386 | Args.push_back(std::make_pair(RValue::get(DeclPtr), |
| 387 | getContext().getPointerType(D.getType()))); |
| 388 | |
| 389 | EmitCall(CGM.getTypes().getFunctionInfo(FD), F, Args); |
| 390 | } |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 391 | } |
| 392 | |
Chris Lattner | 2621fd1 | 2008-05-08 05:58:21 +0000 | [diff] [blame] | 393 | /// Emit an alloca (or GlobalValue depending on target) |
| 394 | /// for the specified parameter and set up LocalDeclMap. |
Daniel Dunbar | b7ec246 | 2008-08-16 03:19:19 +0000 | [diff] [blame] | 395 | void CodeGenFunction::EmitParmDecl(const VarDecl &D, llvm::Value *Arg) { |
| 396 | // FIXME: Why isn't ImplicitParamDecl a ParmVarDecl? |
Sanjiv Gupta | 31fc07d | 2008-10-31 09:52:39 +0000 | [diff] [blame] | 397 | assert((isa<ParmVarDecl>(D) || isa<ImplicitParamDecl>(D)) && |
Daniel Dunbar | b7ec246 | 2008-08-16 03:19:19 +0000 | [diff] [blame] | 398 | "Invalid argument to EmitParmDecl"); |
Chris Lattner | 8bcfc5b | 2008-04-06 23:10:54 +0000 | [diff] [blame] | 399 | QualType Ty = D.getType(); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 400 | |
| 401 | llvm::Value *DeclPtr; |
Eli Friedman | 3c2b317 | 2008-02-15 12:20:59 +0000 | [diff] [blame] | 402 | if (!Ty->isConstantSizeType()) { |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 403 | // Variable sized values always are passed by-reference. |
| 404 | DeclPtr = Arg; |
Chris Lattner | 2621fd1 | 2008-05-08 05:58:21 +0000 | [diff] [blame] | 405 | } else if (Target.useGlobalsForAutomaticVariables()) { |
Sanjiv Gupta | 45206ec | 2009-02-03 18:07:49 +0000 | [diff] [blame] | 406 | // Targets that don't have stack use global address space for parameters. |
| 407 | // Specify external linkage for such globals so that llvm optimizer do |
| 408 | // not assume there values initialized as zero. |
Daniel Dunbar | a985b31 | 2009-02-25 19:45:19 +0000 | [diff] [blame] | 409 | DeclPtr = CreateStaticBlockVarDecl(D, ".auto.", |
| 410 | llvm::GlobalValue::ExternalLinkage); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 411 | } else { |
Dan Gohman | d79a726 | 2008-05-22 22:12:56 +0000 | [diff] [blame] | 412 | // A fixed sized single-value variable becomes an alloca in the entry block. |
Eli Friedman | a3460ac | 2009-03-04 04:25:14 +0000 | [diff] [blame^] | 413 | const llvm::Type *LTy = ConvertTypeForMem(Ty); |
Dan Gohman | d79a726 | 2008-05-22 22:12:56 +0000 | [diff] [blame] | 414 | if (LTy->isSingleValueType()) { |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 415 | // TODO: Alignment |
Chris Lattner | 39f34e9 | 2008-11-24 04:00:27 +0000 | [diff] [blame] | 416 | std::string Name = D.getNameAsString(); |
Daniel Dunbar | 5627377 | 2008-09-17 00:51:38 +0000 | [diff] [blame] | 417 | Name += ".addr"; |
| 418 | DeclPtr = CreateTempAlloca(LTy, Name.c_str()); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 419 | |
| 420 | // Store the initial value into the alloca. |
Eli Friedman | a3460ac | 2009-03-04 04:25:14 +0000 | [diff] [blame^] | 421 | EmitStoreOfScalar(Arg, DeclPtr, Ty.isVolatileQualified()); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 422 | } else { |
| 423 | // Otherwise, if this is an aggregate, just use the input pointer. |
| 424 | DeclPtr = Arg; |
| 425 | } |
Chris Lattner | 39f34e9 | 2008-11-24 04:00:27 +0000 | [diff] [blame] | 426 | Arg->setName(D.getNameAsString()); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 427 | } |
| 428 | |
| 429 | llvm::Value *&DMEntry = LocalDeclMap[&D]; |
| 430 | assert(DMEntry == 0 && "Decl already exists in localdeclmap!"); |
| 431 | DMEntry = DeclPtr; |
Sanjiv Gupta | cc9b163 | 2008-05-30 10:30:31 +0000 | [diff] [blame] | 432 | |
| 433 | // Emit debug info for param declaration. |
Anders Carlsson | e896d98 | 2009-02-13 08:11:52 +0000 | [diff] [blame] | 434 | if (CGDebugInfo *DI = getDebugInfo()) { |
Daniel Dunbar | 66031a5 | 2008-10-17 16:15:48 +0000 | [diff] [blame] | 435 | DI->setLocation(D.getLocation()); |
Chris Lattner | 9c85ba3 | 2008-11-10 06:08:34 +0000 | [diff] [blame] | 436 | DI->EmitDeclareOfArgVariable(&D, DeclPtr, Builder); |
Sanjiv Gupta | cc9b163 | 2008-05-30 10:30:31 +0000 | [diff] [blame] | 437 | } |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 438 | } |
| 439 | |