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1 : //===--- CGDecl.cpp - Emit LLVM Code for declarations ---------------------===//
2 : //
3 : // The LLVM Compiler Infrastructure
4 : //
5 : // This file is distributed under the University of Illinois Open Source
6 : // License. See LICENSE.TXT for details.
7 : //
8 : //===----------------------------------------------------------------------===//
9 : //
10 : // This contains code to emit Decl nodes as LLVM code.
11 : //
12 : //===----------------------------------------------------------------------===//
13 :
14 : #include "CGDebugInfo.h"
15 : #include "CodeGenFunction.h"
16 : #include "CodeGenModule.h"
17 : #include "clang/AST/ASTContext.h"
18 : #include "clang/AST/CharUnits.h"
19 : #include "clang/AST/Decl.h"
20 : #include "clang/AST/DeclObjC.h"
21 : #include "clang/Basic/SourceManager.h"
22 : #include "clang/Basic/TargetInfo.h"
23 : #include "clang/CodeGen/CodeGenOptions.h"
24 : #include "llvm/GlobalVariable.h"
25 : #include "llvm/Intrinsics.h"
26 : #include "llvm/Target/TargetData.h"
27 : #include "llvm/Type.h"
28 : using namespace clang;
29 : using namespace CodeGen;
30 :
31 :
32 1276: void CodeGenFunction::EmitDecl(const Decl &D) {
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33 1276: switch (D.getKind()) {
34 : default:
35 0: CGM.ErrorUnsupported(&D, "decl");
36 0: return;
37 : case Decl::ParmVar:
38 0: assert(0 && "Parmdecls should not be in declstmts!");
39 : case Decl::Function: // void X();
40 : case Decl::Record: // struct/union/class X;
41 : case Decl::Enum: // enum X;
42 : case Decl::EnumConstant: // enum ? { X = ? }
43 : case Decl::CXXRecord: // struct/union/class X; [C++]
44 : case Decl::Using: // using X; [C++]
45 : case Decl::UsingShadow:
46 : case Decl::UsingDirective: // using namespace X; [C++]
47 : case Decl::StaticAssert: // static_assert(X, ""); [C++0x]
48 : // None of these decls require codegen support.
49 80: return;
50 :
51 : case Decl::Var: {
52 1191: const VarDecl &VD = cast<VarDecl>(D);
53 : assert(VD.isBlockVarDecl() &&
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54 1191: "Should not see file-scope variables inside a function!");
55 1191: return EmitBlockVarDecl(VD);
56 : }
57 :
58 : case Decl::Typedef: { // typedef int X;
59 5: const TypedefDecl &TD = cast<TypedefDecl>(D);
60 5: QualType Ty = TD.getUnderlyingType();
61 :
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62 5: if (Ty->isVariablyModifiedType())
63 2: EmitVLASize(Ty);
64 : }
65 : }
66 : }
67 :
68 : /// EmitBlockVarDecl - This method handles emission of any variable declaration
69 : /// inside a function, including static vars etc.
70 1191: void CodeGenFunction::EmitBlockVarDecl(const VarDecl &D) {
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71 1191: if (D.hasAttr<AsmLabelAttr>())
72 0: CGM.ErrorUnsupported(&D, "__asm__");
73 :
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74 1191: switch (D.getStorageClass()) {
75 : case VarDecl::None:
76 : case VarDecl::Auto:
77 : case VarDecl::Register:
78 1099: return EmitLocalBlockVarDecl(D);
79 : case VarDecl::Static: {
80 : llvm::GlobalValue::LinkageTypes Linkage =
81 77: llvm::GlobalValue::InternalLinkage;
82 :
83 : // If this is a static declaration inside an inline function, it must have
84 : // weak linkage so that the linker will merge multiple definitions of it.
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85 77: if (getContext().getLangOptions().CPlusPlus) {
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86 18: if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(CurFuncDecl)) {
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87 16: if (FD->isInlined())
88 5: Linkage = llvm::GlobalValue::WeakAnyLinkage;
89 : }
90 : }
91 :
92 77: return EmitStaticBlockVarDecl(D, Linkage);
93 : }
94 : case VarDecl::Extern:
95 : case VarDecl::PrivateExtern:
96 : // Don't emit it now, allow it to be emitted lazily on its first use.
97 15: return;
98 : }
99 :
100 0: assert(0 && "Unknown storage class");
101 : }
102 :
103 : static std::string GetStaticDeclName(CodeGenFunction &CGF, const VarDecl &D,
104 124: const char *Separator) {
105 124: CodeGenModule &CGM = CGF.CGM;
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104: branch 3 taken
106 124: if (CGF.getContext().getLangOptions().CPlusPlus)
107 20: return CGM.getMangledName(&D);
108 :
109 104: std::string ContextName;
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110 104: if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(CGF.CurFuncDecl))
111 99: ContextName = CGM.getMangledName(FD);
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112 5: else if (isa<ObjCMethodDecl>(CGF.CurFuncDecl))
113 5: ContextName = CGF.CurFn->getName();
114 : else
115 : // FIXME: What about in a block??
116 0: assert(0 && "Unknown context for block var decl");
117 :
118 104: return ContextName + Separator + D.getNameAsString();
119 : }
120 :
121 : llvm::GlobalVariable *
122 : CodeGenFunction::CreateStaticBlockVarDecl(const VarDecl &D,
123 : const char *Separator,
124 79: llvm::GlobalValue::LinkageTypes Linkage) {
125 79: QualType Ty = D.getType();
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126 79: assert(Ty->isConstantSizeType() && "VLAs can't be static");
127 :
128 79: std::string Name = GetStaticDeclName(*this, D, Separator);
129 :
130 79: const llvm::Type *LTy = CGM.getTypes().ConvertTypeForMem(Ty);
131 : llvm::GlobalVariable *GV =
132 : new llvm::GlobalVariable(CGM.getModule(), LTy,
133 : Ty.isConstant(getContext()), Linkage,
134 : CGM.EmitNullConstant(D.getType()), Name, 0,
135 79: D.isThreadSpecified(), Ty.getAddressSpace());
136 79: GV->setAlignment(getContext().getDeclAlign(&D).getQuantity());
137 79: return GV;
138 : }
139 :
140 : /// AddInitializerToGlobalBlockVarDecl - Add the initializer for 'D' to the
141 : /// global variable that has already been created for it. If the initializer
142 : /// has a different type than GV does, this may free GV and return a different
143 : /// one. Otherwise it just returns GV.
144 : llvm::GlobalVariable *
145 : CodeGenFunction::AddInitializerToGlobalBlockVarDecl(const VarDecl &D,
146 49: llvm::GlobalVariable *GV) {
147 49: llvm::Constant *Init = CGM.EmitConstantExpr(D.getInit(), D.getType(), this);
148 :
149 : // If constant emission failed, then this should be a C++ static
150 : // initializer.
10: branch 0 taken
39: branch 1 taken
151 49: if (!Init) {
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10: branch 3 taken
152 10: if (!getContext().getLangOptions().CPlusPlus)
153 0: CGM.ErrorUnsupported(D.getInit(), "constant l-value expression");
154 : else {
155 : // Since we have a static initializer, this global variable can't
156 : // be constant.
157 10: GV->setConstant(false);
158 :
159 10: EmitStaticCXXBlockVarDeclInit(D, GV);
160 : }
161 10: return GV;
162 : }
163 :
164 : // The initializer may differ in type from the global. Rewrite
165 : // the global to match the initializer. (We have to do this
166 : // because some types, like unions, can't be completely represented
167 : // in the LLVM type system.)
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168 39: if (GV->getType() != Init->getType()) {
169 39: llvm::GlobalVariable *OldGV = GV;
170 :
171 : GV = new llvm::GlobalVariable(CGM.getModule(), Init->getType(),
172 : OldGV->isConstant(),
173 : OldGV->getLinkage(), Init, "",
174 : 0, D.isThreadSpecified(),
175 39: D.getType().getAddressSpace());
176 :
177 : // Steal the name of the old global
178 39: GV->takeName(OldGV);
179 :
180 : // Replace all uses of the old global with the new global
181 : llvm::Constant *NewPtrForOldDecl =
182 39: llvm::ConstantExpr::getBitCast(GV, OldGV->getType());
183 39: OldGV->replaceAllUsesWith(NewPtrForOldDecl);
184 :
185 : // Erase the old global, since it is no longer used.
186 39: OldGV->eraseFromParent();
187 : }
188 :
189 39: GV->setInitializer(Init);
190 39: return GV;
191 : }
192 :
193 : void CodeGenFunction::EmitStaticBlockVarDecl(const VarDecl &D,
194 79: llvm::GlobalValue::LinkageTypes Linkage) {
195 79: llvm::Value *&DMEntry = LocalDeclMap[&D];
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79: branch 1 taken
196 79: assert(DMEntry == 0 && "Decl already exists in localdeclmap!");
197 :
198 79: llvm::GlobalVariable *GV = CreateStaticBlockVarDecl(D, ".", Linkage);
199 :
200 : // Store into LocalDeclMap before generating initializer to handle
201 : // circular references.
202 79: DMEntry = GV;
203 :
204 : // Make sure to evaluate VLA bounds now so that we have them for later.
205 : //
206 : // FIXME: Can this happen?
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207 79: if (D.getType()->isVariablyModifiedType())
208 1: EmitVLASize(D.getType());
209 :
210 : // If this value has an initializer, emit it.
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211 79: if (D.getInit())
212 49: GV = AddInitializerToGlobalBlockVarDecl(D, GV);
213 :
214 : // FIXME: Merge attribute handling.
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215 79: if (const AnnotateAttr *AA = D.getAttr<AnnotateAttr>()) {
216 1: SourceManager &SM = CGM.getContext().getSourceManager();
217 : llvm::Constant *Ann =
218 : CGM.EmitAnnotateAttr(GV, AA,
219 1: SM.getInstantiationLineNumber(D.getLocation()));
220 1: CGM.AddAnnotation(Ann);
221 : }
222 :
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223 79: if (const SectionAttr *SA = D.getAttr<SectionAttr>())
224 1: GV->setSection(SA->getName());
225 :
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226 79: if (D.hasAttr<UsedAttr>())
227 1: CGM.AddUsedGlobal(GV);
228 :
229 : // We may have to cast the constant because of the initializer
230 : // mismatch above.
231 : //
232 : // FIXME: It is really dangerous to store this in the map; if anyone
233 : // RAUW's the GV uses of this constant will be invalid.
234 79: const llvm::Type *LTy = CGM.getTypes().ConvertTypeForMem(D.getType());
235 : const llvm::Type *LPtrTy =
236 79: llvm::PointerType::get(LTy, D.getType().getAddressSpace());
237 79: DMEntry = llvm::ConstantExpr::getBitCast(GV, LPtrTy);
238 :
239 : // Emit global variable debug descriptor for static vars.
240 79: CGDebugInfo *DI = getDebugInfo();
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78: branch 1 taken
241 79: if (DI) {
242 1: DI->setLocation(D.getLocation());
243 1: DI->EmitGlobalVariable(static_cast<llvm::GlobalVariable *>(GV), &D);
244 : }
245 79: }
246 :
247 46: unsigned CodeGenFunction::getByRefValueLLVMField(const ValueDecl *VD) const {
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248 46: assert(ByRefValueInfo.count(VD) && "Did not find value!");
249 :
250 46: return ByRefValueInfo.find(VD)->second.second;
251 : }
252 :
253 : /// BuildByRefType - This routine changes a __block variable declared as T x
254 : /// into:
255 : ///
256 : /// struct {
257 : /// void *__isa;
258 : /// void *__forwarding;
259 : /// int32_t __flags;
260 : /// int32_t __size;
261 : /// void *__copy_helper; // only if needed
262 : /// void *__destroy_helper; // only if needed
263 : /// char padding[X]; // only if needed
264 : /// T x;
265 : /// } x
266 : ///
267 73: const llvm::Type *CodeGenFunction::BuildByRefType(const ValueDecl *D) {
268 73: std::pair<const llvm::Type *, unsigned> &Info = ByRefValueInfo[D];
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269 73: if (Info.first)
270 26: return Info.first;
271 :
272 47: QualType Ty = D->getType();
273 :
274 47: std::vector<const llvm::Type *> Types;
275 :
276 47: const llvm::PointerType *Int8PtrTy = llvm::Type::getInt8PtrTy(VMContext);
277 :
278 47: llvm::PATypeHolder ByRefTypeHolder = llvm::OpaqueType::get(VMContext);
279 :
280 : // void *__isa;
281 47: Types.push_back(Int8PtrTy);
282 :
283 : // void *__forwarding;
284 47: Types.push_back(llvm::PointerType::getUnqual(ByRefTypeHolder));
285 :
286 : // int32_t __flags;
287 47: Types.push_back(llvm::Type::getInt32Ty(VMContext));
288 :
289 : // int32_t __size;
290 47: Types.push_back(llvm::Type::getInt32Ty(VMContext));
291 :
292 47: bool HasCopyAndDispose = BlockRequiresCopying(Ty);
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293 47: if (HasCopyAndDispose) {
294 : /// void *__copy_helper;
295 25: Types.push_back(Int8PtrTy);
296 :
297 : /// void *__destroy_helper;
298 25: Types.push_back(Int8PtrTy);
299 : }
300 :
301 47: bool Packed = false;
302 47: CharUnits Align = getContext().getDeclAlign(D);
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303 47: if (Align > CharUnits::fromQuantity(Target.getPointerAlign(0) / 8)) {
304 : // We have to insert padding.
305 :
306 : // The struct above has 2 32-bit integers.
307 0: unsigned CurrentOffsetInBytes = 4 * 2;
308 :
309 : // And either 2 or 4 pointers.
310 : CurrentOffsetInBytes += (HasCopyAndDispose ? 4 : 2) *
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311 0: CGM.getTargetData().getTypeAllocSize(Int8PtrTy);
312 :
313 : // Align the offset.
314 : unsigned AlignedOffsetInBytes =
315 0: llvm::RoundUpToAlignment(CurrentOffsetInBytes, Align.getQuantity());
316 :
317 0: unsigned NumPaddingBytes = AlignedOffsetInBytes - CurrentOffsetInBytes;
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318 0: if (NumPaddingBytes > 0) {
319 0: const llvm::Type *Ty = llvm::Type::getInt8Ty(VMContext);
320 : // FIXME: We need a sema error for alignment larger than the minimum of
321 : // the maximal stack alignmint and the alignment of malloc on the system.
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322 0: if (NumPaddingBytes > 1)
323 0: Ty = llvm::ArrayType::get(Ty, NumPaddingBytes);
324 :
325 0: Types.push_back(Ty);
326 :
327 : // We want a packed struct.
328 0: Packed = true;
329 : }
330 : }
331 :
332 : // T x;
333 47: Types.push_back(ConvertType(Ty));
334 :
335 47: const llvm::Type *T = llvm::StructType::get(VMContext, Types, Packed);
336 :
337 47: cast<llvm::OpaqueType>(ByRefTypeHolder.get())->refineAbstractTypeTo(T);
338 : CGM.getModule().addTypeName("struct.__block_byref_" + D->getNameAsString(),
339 47: ByRefTypeHolder.get());
340 :
341 47: Info.first = ByRefTypeHolder.get();
342 :
343 47: Info.second = Types.size() - 1;
344 :
345 47: return Info.first;
346 : }
347 :
348 : /// EmitLocalBlockVarDecl - Emit code and set up an entry in LocalDeclMap for a
349 : /// variable declaration with auto, register, or no storage class specifier.
350 : /// These turn into simple stack objects, or GlobalValues depending on target.
351 1129: void CodeGenFunction::EmitLocalBlockVarDecl(const VarDecl &D) {
352 1129: QualType Ty = D.getType();
353 1129: bool isByRef = D.hasAttr<BlocksAttr>();
354 1129: bool needsDispose = false;
355 1129: CharUnits Align = CharUnits::Zero();
356 1129: bool IsSimpleConstantInitializer = false;
357 :
358 : llvm::Value *DeclPtr;
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359 1129: if (Ty->isConstantSizeType()) {
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360 1118: if (!Target.useGlobalsForAutomaticVariables()) {
361 :
362 : // If this value is an array or struct, is POD, and if the initializer is
363 : // a staticly determinable constant, try to optimize it.
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364 1118: if (D.getInit() && !isByRef &&
365 : (Ty->isArrayType() || Ty->isRecordType()) &&
366 : Ty->isPODType() &&
367 : D.getInit()->isConstantInitializer(getContext())) {
368 : // If this variable is marked 'const', emit the value as a global.
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369 49: if (CGM.getCodeGenOpts().MergeAllConstants &&
370 : Ty.isConstant(getContext())) {
371 2: EmitStaticBlockVarDecl(D, llvm::GlobalValue::InternalLinkage);
372 2: return;
373 : }
374 :
375 47: IsSimpleConstantInitializer = true;
376 : }
377 :
378 : // A normal fixed sized variable becomes an alloca in the entry block.
379 1116: const llvm::Type *LTy = ConvertTypeForMem(Ty);
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380 1116: if (isByRef)
381 24: LTy = BuildByRefType(&D);
382 1116: llvm::AllocaInst *Alloc = CreateTempAlloca(LTy);
383 1116: Alloc->setName(D.getNameAsString());
384 :
385 1116: Align = getContext().getDeclAlign(&D);
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1092: branch 1 taken
386 1116: if (isByRef)
387 : Align = std::max(Align,
388 24: CharUnits::fromQuantity(Target.getPointerAlign(0) / 8));
389 1116: Alloc->setAlignment(Align.getQuantity());
390 1116: DeclPtr = Alloc;
391 : } else {
392 : // Targets that don't support recursion emit locals as globals.
393 : const char *Class =
0: branch 1 not taken
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394 0: D.getStorageClass() == VarDecl::Register ? ".reg." : ".auto.";
395 : DeclPtr = CreateStaticBlockVarDecl(D, Class,
396 : llvm::GlobalValue
397 0: ::InternalLinkage);
398 : }
399 :
400 : // FIXME: Can this happen?
4: branch 2 taken
1112: branch 3 taken
401 1116: if (Ty->isVariablyModifiedType())
402 4: EmitVLASize(Ty);
403 : } else {
404 11: EnsureInsertPoint();
405 :
11: branch 0 taken
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406 11: if (!DidCallStackSave) {
407 : // Save the stack.
408 11: const llvm::Type *LTy = llvm::Type::getInt8PtrTy(VMContext);
409 11: llvm::Value *Stack = CreateTempAlloca(LTy, "saved_stack");
410 :
411 11: llvm::Value *F = CGM.getIntrinsic(llvm::Intrinsic::stacksave);
412 11: llvm::Value *V = Builder.CreateCall(F);
413 :
414 11: Builder.CreateStore(V, Stack);
415 :
416 11: DidCallStackSave = true;
417 :
418 : {
419 : // Push a cleanup block and restore the stack there.
420 11: DelayedCleanupBlock scope(*this);
421 :
422 11: V = Builder.CreateLoad(Stack, "tmp");
423 11: llvm::Value *F = CGM.getIntrinsic(llvm::Intrinsic::stackrestore);
424 11: Builder.CreateCall(F, V);
425 : }
426 : }
427 :
428 : // Get the element type.
429 11: const llvm::Type *LElemTy = ConvertTypeForMem(Ty);
430 : const llvm::Type *LElemPtrTy =
431 11: llvm::PointerType::get(LElemTy, D.getType().getAddressSpace());
432 :
433 11: llvm::Value *VLASize = EmitVLASize(Ty);
434 :
435 : // Downcast the VLA size expression
436 : VLASize = Builder.CreateIntCast(VLASize, llvm::Type::getInt32Ty(VMContext),
437 11: false, "tmp");
438 :
439 : // Allocate memory for the array.
440 : llvm::AllocaInst *VLA =
441 11: Builder.CreateAlloca(llvm::Type::getInt8Ty(VMContext), VLASize, "vla");
442 11: VLA->setAlignment(getContext().getDeclAlign(&D).getQuantity());
443 :
444 11: DeclPtr = Builder.CreateBitCast(VLA, LElemPtrTy, "tmp");
445 : }
446 :
447 1127: llvm::Value *&DMEntry = LocalDeclMap[&D];
0: branch 0 not taken
1127: branch 1 taken
448 1127: assert(DMEntry == 0 && "Decl already exists in localdeclmap!");
449 1127: DMEntry = DeclPtr;
450 :
451 : // Emit debug info for local var declaration.
138: branch 1 taken
989: branch 2 taken
452 1127: if (CGDebugInfo *DI = getDebugInfo()) {
138: branch 1 taken
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453 138: assert(HaveInsertPoint() && "Unexpected unreachable point!");
454 :
455 138: DI->setLocation(D.getLocation());
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138: branch 2 taken
456 138: if (Target.useGlobalsForAutomaticVariables()) {
457 0: DI->EmitGlobalVariable(static_cast<llvm::GlobalVariable *>(DeclPtr), &D);
458 : } else
459 138: DI->EmitDeclareOfAutoVariable(&D, DeclPtr, Builder);
460 : }
461 :
462 : // If this local has an initializer, emit it now.
463 1127: const Expr *Init = D.getInit();
464 :
465 : // If we are at an unreachable point, we don't need to emit the initializer
466 : // unless it contains a label.
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467 1127: if (!HaveInsertPoint()) {
2: branch 1 taken
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468 2: if (!ContainsLabel(Init))
469 2: Init = 0;
470 : else
471 0: EnsureInsertPoint();
472 : }
473 :
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325: branch 1 taken
474 1127: if (Init) {
475 802: llvm::Value *Loc = DeclPtr;
5: branch 0 taken
797: branch 1 taken
476 802: if (isByRef)
477 : Loc = Builder.CreateStructGEP(DeclPtr, getByRefValueLLVMField(&D),
478 5: D.getNameAsString());
479 :
480 : bool isVolatile =
481 802: getContext().getCanonicalType(D.getType()).isVolatileQualified();
482 :
483 : // If the initializer was a simple constant initializer, we can optimize it
484 : // in various ways.
47: branch 0 taken
755: branch 1 taken
485 802: if (IsSimpleConstantInitializer) {
486 47: llvm::Constant *Init = CGM.EmitConstantExpr(D.getInit(),D.getType(),this);
0: branch 0 not taken
47: branch 1 taken
487 47: assert(Init != 0 && "Wasn't a simple constant init?");
488 :
489 : llvm::Value *AlignVal =
490 : llvm::ConstantInt::get(llvm::Type::getInt32Ty(VMContext),
491 47: Align.getQuantity());
492 : const llvm::Type *IntPtr =
493 47: llvm::IntegerType::get(VMContext, LLVMPointerWidth);
494 : llvm::Value *SizeVal =
495 : llvm::ConstantInt::get(IntPtr,
496 47: getContext().getTypeSizeInChars(Ty).getQuantity());
497 :
498 47: const llvm::Type *BP = llvm::Type::getInt8PtrTy(VMContext);
47: branch 1 taken
0: branch 2 not taken
499 47: if (Loc->getType() != BP)
500 47: Loc = Builder.CreateBitCast(Loc, BP, "tmp");
501 :
502 : // If the initializer is all zeros, codegen with memset.
2: branch 1 taken
45: branch 2 taken
503 47: if (isa<llvm::ConstantAggregateZero>(Init)) {
504 : llvm::Value *Zero =
505 2: llvm::ConstantInt::get(llvm::Type::getInt8Ty(VMContext), 0);
506 2: Builder.CreateCall4(CGM.getMemSetFn(), Loc, Zero, SizeVal, AlignVal);
507 : } else {
508 : // Otherwise, create a temporary global with the initializer then
509 : // memcpy from the global to the alloca.
510 45: std::string Name = GetStaticDeclName(*this, D, ".");
511 : llvm::GlobalVariable *GV =
512 : new llvm::GlobalVariable(CGM.getModule(), Init->getType(), true,
513 : llvm::GlobalValue::InternalLinkage,
514 45: Init, Name, 0, false, 0);
515 45: GV->setAlignment(Align.getQuantity());
516 :
517 45: llvm::Value *SrcPtr = GV;
45: branch 1 taken
0: branch 2 not taken
518 45: if (SrcPtr->getType() != BP)
519 45: SrcPtr = Builder.CreateBitCast(SrcPtr, BP, "tmp");
520 :
521 45: Builder.CreateCall4(CGM.getMemCpyFn(), Loc, SrcPtr, SizeVal, AlignVal);
522 : }
10: branch 2 taken
745: branch 3 taken
523 755: } else if (Ty->isReferenceType()) {
524 10: RValue RV = EmitReferenceBindingToExpr(Init, /*IsInitializer=*/true);
525 10: EmitStoreOfScalar(RV.getScalarVal(), Loc, false, Ty);
514: branch 2 taken
231: branch 3 taken
526 745: } else if (!hasAggregateLLVMType(Init->getType())) {
527 514: llvm::Value *V = EmitScalarExpr(Init);
528 514: EmitStoreOfScalar(V, Loc, isVolatile, D.getType());
23: branch 3 taken
208: branch 4 taken
529 231: } else if (Init->getType()->isAnyComplexType()) {
530 23: EmitComplexExprIntoAddr(Init, Loc, isVolatile);
531 : } else {
532 208: EmitAggExpr(Init, Loc, isVolatile);
533 : }
534 : }
535 :
24: branch 0 taken
1103: branch 1 taken
536 1127: if (isByRef) {
537 24: const llvm::PointerType *PtrToInt8Ty = llvm::Type::getInt8PtrTy(VMContext);
538 :
539 24: EnsureInsertPoint();
540 24: llvm::Value *isa_field = Builder.CreateStructGEP(DeclPtr, 0);
541 24: llvm::Value *forwarding_field = Builder.CreateStructGEP(DeclPtr, 1);
542 24: llvm::Value *flags_field = Builder.CreateStructGEP(DeclPtr, 2);
543 24: llvm::Value *size_field = Builder.CreateStructGEP(DeclPtr, 3);
544 : llvm::Value *V;
545 24: int flag = 0;
546 24: int flags = 0;
547 :
548 24: needsDispose = true;
549 :
2: branch 2 taken
22: branch 3 taken
550 24: if (Ty->isBlockPointerType()) {
551 2: flag |= BLOCK_FIELD_IS_BLOCK;
552 2: flags |= BLOCK_HAS_COPY_DISPOSE;
11: branch 1 taken
11: branch 2 taken
553 22: } else if (BlockRequiresCopying(Ty)) {
554 11: flag |= BLOCK_FIELD_IS_OBJECT;
555 11: flags |= BLOCK_HAS_COPY_DISPOSE;
556 : }
557 :
558 : // FIXME: Someone double check this.
3: branch 1 taken
21: branch 2 taken
559 24: if (Ty.isObjCGCWeak())
560 3: flag |= BLOCK_FIELD_IS_WEAK;
561 :
562 24: int isa = 0;
3: branch 0 taken
21: branch 1 taken
563 24: if (flag&BLOCK_FIELD_IS_WEAK)
564 3: isa = 1;
565 24: V = llvm::ConstantInt::get(llvm::Type::getInt32Ty(VMContext), isa);
566 24: V = Builder.CreateIntToPtr(V, PtrToInt8Ty, "isa");
567 24: Builder.CreateStore(V, isa_field);
568 :
569 24: Builder.CreateStore(DeclPtr, forwarding_field);
570 :
571 24: V = llvm::ConstantInt::get(llvm::Type::getInt32Ty(VMContext), flags);
572 24: Builder.CreateStore(V, flags_field);
573 :
574 : const llvm::Type *V1;
575 24: V1 = cast<llvm::PointerType>(DeclPtr->getType())->getElementType();
576 : V = llvm::ConstantInt::get(llvm::Type::getInt32Ty(VMContext),
577 24: CGM.GetTargetTypeStoreSize(V1).getQuantity());
578 24: Builder.CreateStore(V, size_field);
579 :
13: branch 0 taken
11: branch 1 taken
580 24: if (flags & BLOCK_HAS_COPY_DISPOSE) {
581 13: BlockHasCopyDispose = true;
582 13: llvm::Value *copy_helper = Builder.CreateStructGEP(DeclPtr, 4);
583 : Builder.CreateStore(BuildbyrefCopyHelper(DeclPtr->getType(), flag,
584 : Align.getQuantity()),
585 13: copy_helper);
586 :
587 13: llvm::Value *destroy_helper = Builder.CreateStructGEP(DeclPtr, 5);
588 : Builder.CreateStore(BuildbyrefDestroyHelper(DeclPtr->getType(), flag,
589 : Align.getQuantity()),
590 13: destroy_helper);
591 : }
592 : }
593 :
594 : // Handle CXX destruction of variables.
595 1127: QualType DtorTy(Ty);
67: branch 2 taken
1127: branch 3 taken
596 1261: while (const ArrayType *Array = getContext().getAsArrayType(DtorTy))
597 67: DtorTy = getContext().getBaseElementType(Array);
299: branch 2 taken
828: branch 3 taken
598 1127: if (const RecordType *RT = DtorTy->getAs<RecordType>())
184: branch 2 taken
115: branch 3 taken
599 299: if (CXXRecordDecl *ClassDecl = dyn_cast<CXXRecordDecl>(RT->getDecl())) {
57: branch 1 taken
127: branch 2 taken
600 184: if (!ClassDecl->hasTrivialDestructor()) {
601 57: const CXXDestructorDecl *D = ClassDecl->getDestructor(getContext());
0: branch 0 not taken
57: branch 1 taken
602 57: assert(D && "EmitLocalBlockVarDecl - destructor is nul");
603 :
2: branch 0 taken
55: branch 1 taken
604 57: if (const ConstantArrayType *Array =
605 57: getContext().getAsConstantArrayType(Ty)) {
606 : {
607 2: DelayedCleanupBlock Scope(*this);
608 2: QualType BaseElementTy = getContext().getBaseElementType(Array);
609 2: const llvm::Type *BasePtr = ConvertType(BaseElementTy);
610 2: BasePtr = llvm::PointerType::getUnqual(BasePtr);
611 : llvm::Value *BaseAddrPtr =
612 2: Builder.CreateBitCast(DeclPtr, BasePtr);
613 2: EmitCXXAggrDestructorCall(D, Array, BaseAddrPtr);
614 :
615 : // Make sure to jump to the exit block.
616 2: EmitBranch(Scope.getCleanupExitBlock());
617 : }
0: branch 0 not taken
2: branch 1 taken
618 2: if (Exceptions) {
619 0: EHCleanupBlock Cleanup(*this);
620 0: QualType BaseElementTy = getContext().getBaseElementType(Array);
621 0: const llvm::Type *BasePtr = ConvertType(BaseElementTy);
622 0: BasePtr = llvm::PointerType::getUnqual(BasePtr);
623 : llvm::Value *BaseAddrPtr =
624 0: Builder.CreateBitCast(DeclPtr, BasePtr);
625 0: EmitCXXAggrDestructorCall(D, Array, BaseAddrPtr);
626 : }
627 : } else {
628 : {
629 55: DelayedCleanupBlock Scope(*this);
630 55: EmitCXXDestructorCall(D, Dtor_Complete, DeclPtr);
631 :
632 : // Make sure to jump to the exit block.
633 55: EmitBranch(Scope.getCleanupExitBlock());
634 : }
5: branch 0 taken
50: branch 1 taken
635 55: if (Exceptions) {
636 5: EHCleanupBlock Cleanup(*this);
637 5: EmitCXXDestructorCall(D, Dtor_Complete, DeclPtr);
638 : }
639 : }
640 : }
641 : }
642 :
643 : // Handle the cleanup attribute
4: branch 1 taken
1123: branch 2 taken
644 1127: if (const CleanupAttr *CA = D.getAttr<CleanupAttr>()) {
645 4: const FunctionDecl *FD = CA->getFunctionDecl();
646 :
647 4: llvm::Constant* F = CGM.GetAddrOfFunction(FD);
0: branch 0 not taken
4: branch 1 taken
648 4: assert(F && "Could not find function!");
649 :
650 4: const CGFunctionInfo &Info = CGM.getTypes().getFunctionInfo(FD);
651 :
652 : // In some cases, the type of the function argument will be different from
653 : // the type of the pointer. An example of this is
654 : // void f(void* arg);
655 : // __attribute__((cleanup(f))) void *g;
656 : //
657 : // To fix this we insert a bitcast here.
658 4: QualType ArgTy = Info.arg_begin()->type;
659 : {
660 4: DelayedCleanupBlock scope(*this);
661 :
662 4: CallArgList Args;
663 : Args.push_back(std::make_pair(RValue::get(Builder.CreateBitCast(DeclPtr,
664 : ConvertType(ArgTy))),
665 4: getContext().getPointerType(D.getType())));
666 4: EmitCall(Info, F, ReturnValueSlot(), Args);
667 : }
0: branch 0 not taken
4: branch 1 taken
668 4: if (Exceptions) {
669 0: EHCleanupBlock Cleanup(*this);
670 :
671 0: CallArgList Args;
672 : Args.push_back(std::make_pair(RValue::get(Builder.CreateBitCast(DeclPtr,
673 : ConvertType(ArgTy))),
674 0: getContext().getPointerType(D.getType())));
675 0: EmitCall(Info, F, ReturnValueSlot(), Args);
676 : }
677 : }
678 :
24: branch 0 taken
1103: branch 1 taken
24: branch 4 taken
0: branch 5 not taken
24: branch 6 taken
1103: branch 7 taken
679 1127: if (needsDispose && CGM.getLangOptions().getGCMode() != LangOptions::GCOnly) {
680 : {
681 24: DelayedCleanupBlock scope(*this);
682 24: llvm::Value *V = Builder.CreateStructGEP(DeclPtr, 1, "forwarding");
683 24: V = Builder.CreateLoad(V);
684 24: BuildBlockRelease(V);
685 : }
686 : // FIXME: Turn this on and audit the codegen
687 : if (0 && Exceptions) {
688 : EHCleanupBlock Cleanup(*this);
689 : llvm::Value *V = Builder.CreateStructGEP(DeclPtr, 1, "forwarding");
690 : V = Builder.CreateLoad(V);
691 : BuildBlockRelease(V);
692 : }
693 : }
694 : }
695 :
696 : /// Emit an alloca (or GlobalValue depending on target)
697 : /// for the specified parameter and set up LocalDeclMap.
698 2994: void CodeGenFunction::EmitParmDecl(const VarDecl &D, llvm::Value *Arg) {
699 : // FIXME: Why isn't ImplicitParamDecl a ParmVarDecl?
700 : assert((isa<ParmVarDecl>(D) || isa<ImplicitParamDecl>(D)) &&
1857: branch 1 taken
1137: branch 2 taken
1857: branch 4 taken
0: branch 5 not taken
701 2994: "Invalid argument to EmitParmDecl");
702 2994: QualType Ty = D.getType();
703 2994: CanQualType CTy = getContext().getCanonicalType(Ty);
704 :
705 : llvm::Value *DeclPtr;
706 : // If this is an aggregate or variable sized value, reuse the input pointer.
2994: branch 2 taken
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149: branch 5 taken
2845: branch 6 taken
149: branch 7 taken
2845: branch 8 taken
707 5988: if (!Ty->isConstantSizeType() ||
708 : CodeGenFunction::hasAggregateLLVMType(Ty)) {
709 149: DeclPtr = Arg;
710 : } else {
711 : // Otherwise, create a temporary to hold the value.
712 2845: DeclPtr = CreateMemTemp(Ty, D.getName() + ".addr");
713 :
714 : // Store the initial value into the alloca.
715 2845: EmitStoreOfScalar(Arg, DeclPtr, CTy.isVolatileQualified(), Ty);
716 : }
717 2994: Arg->setName(D.getName());
718 :
719 2994: llvm::Value *&DMEntry = LocalDeclMap[&D];
0: branch 0 not taken
2994: branch 1 taken
720 2994: assert(DMEntry == 0 && "Decl already exists in localdeclmap!");
721 2994: DMEntry = DeclPtr;
722 :
723 : // Emit debug info for param declaration.
71: branch 1 taken
2923: branch 2 taken
724 2994: if (CGDebugInfo *DI = getDebugInfo()) {
725 71: DI->setLocation(D.getLocation());
726 71: DI->EmitDeclareOfArgVariable(&D, DeclPtr, Builder);
727 : }
728 2994: }
Generated: 2010-02-10 01:31 by zcov