clang  7.0.0svn
CGDecl.cpp
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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 "CGBlocks.h"
15 #include "CGCXXABI.h"
16 #include "CGCleanup.h"
17 #include "CGDebugInfo.h"
18 #include "CGOpenCLRuntime.h"
19 #include "CGOpenMPRuntime.h"
20 #include "CodeGenFunction.h"
21 #include "CodeGenModule.h"
22 #include "ConstantEmitter.h"
23 #include "TargetInfo.h"
24 #include "clang/AST/ASTContext.h"
25 #include "clang/AST/CharUnits.h"
26 #include "clang/AST/Decl.h"
27 #include "clang/AST/DeclObjC.h"
28 #include "clang/AST/DeclOpenMP.h"
30 #include "clang/Basic/TargetInfo.h"
33 #include "llvm/IR/DataLayout.h"
34 #include "llvm/IR/GlobalVariable.h"
35 #include "llvm/IR/Intrinsics.h"
36 #include "llvm/IR/Type.h"
37 
38 using namespace clang;
39 using namespace CodeGen;
40 
42  switch (D.getKind()) {
43  case Decl::BuiltinTemplate:
44  case Decl::TranslationUnit:
45  case Decl::ExternCContext:
46  case Decl::Namespace:
47  case Decl::UnresolvedUsingTypename:
48  case Decl::ClassTemplateSpecialization:
49  case Decl::ClassTemplatePartialSpecialization:
50  case Decl::VarTemplateSpecialization:
51  case Decl::VarTemplatePartialSpecialization:
52  case Decl::TemplateTypeParm:
53  case Decl::UnresolvedUsingValue:
54  case Decl::NonTypeTemplateParm:
55  case Decl::CXXDeductionGuide:
56  case Decl::CXXMethod:
57  case Decl::CXXConstructor:
58  case Decl::CXXDestructor:
59  case Decl::CXXConversion:
60  case Decl::Field:
61  case Decl::MSProperty:
62  case Decl::IndirectField:
63  case Decl::ObjCIvar:
64  case Decl::ObjCAtDefsField:
65  case Decl::ParmVar:
66  case Decl::ImplicitParam:
67  case Decl::ClassTemplate:
68  case Decl::VarTemplate:
69  case Decl::FunctionTemplate:
70  case Decl::TypeAliasTemplate:
71  case Decl::TemplateTemplateParm:
72  case Decl::ObjCMethod:
73  case Decl::ObjCCategory:
74  case Decl::ObjCProtocol:
75  case Decl::ObjCInterface:
76  case Decl::ObjCCategoryImpl:
77  case Decl::ObjCImplementation:
78  case Decl::ObjCProperty:
79  case Decl::ObjCCompatibleAlias:
80  case Decl::PragmaComment:
81  case Decl::PragmaDetectMismatch:
82  case Decl::AccessSpec:
83  case Decl::LinkageSpec:
84  case Decl::Export:
85  case Decl::ObjCPropertyImpl:
86  case Decl::FileScopeAsm:
87  case Decl::Friend:
88  case Decl::FriendTemplate:
89  case Decl::Block:
90  case Decl::Captured:
91  case Decl::ClassScopeFunctionSpecialization:
92  case Decl::UsingShadow:
93  case Decl::ConstructorUsingShadow:
94  case Decl::ObjCTypeParam:
95  case Decl::Binding:
96  llvm_unreachable("Declaration should not be in declstmts!");
97  case Decl::Function: // void X();
98  case Decl::Record: // struct/union/class X;
99  case Decl::Enum: // enum X;
100  case Decl::EnumConstant: // enum ? { X = ? }
101  case Decl::CXXRecord: // struct/union/class X; [C++]
102  case Decl::StaticAssert: // static_assert(X, ""); [C++0x]
103  case Decl::Label: // __label__ x;
104  case Decl::Import:
105  case Decl::OMPThreadPrivate:
106  case Decl::OMPCapturedExpr:
107  case Decl::Empty:
108  // None of these decls require codegen support.
109  return;
110 
111  case Decl::NamespaceAlias:
112  if (CGDebugInfo *DI = getDebugInfo())
113  DI->EmitNamespaceAlias(cast<NamespaceAliasDecl>(D));
114  return;
115  case Decl::Using: // using X; [C++]
116  if (CGDebugInfo *DI = getDebugInfo())
117  DI->EmitUsingDecl(cast<UsingDecl>(D));
118  return;
119  case Decl::UsingPack:
120  for (auto *Using : cast<UsingPackDecl>(D).expansions())
121  EmitDecl(*Using);
122  return;
123  case Decl::UsingDirective: // using namespace X; [C++]
124  if (CGDebugInfo *DI = getDebugInfo())
125  DI->EmitUsingDirective(cast<UsingDirectiveDecl>(D));
126  return;
127  case Decl::Var:
128  case Decl::Decomposition: {
129  const VarDecl &VD = cast<VarDecl>(D);
130  assert(VD.isLocalVarDecl() &&
131  "Should not see file-scope variables inside a function!");
132  EmitVarDecl(VD);
133  if (auto *DD = dyn_cast<DecompositionDecl>(&VD))
134  for (auto *B : DD->bindings())
135  if (auto *HD = B->getHoldingVar())
136  EmitVarDecl(*HD);
137  return;
138  }
139 
140  case Decl::OMPDeclareReduction:
141  return CGM.EmitOMPDeclareReduction(cast<OMPDeclareReductionDecl>(&D), this);
142 
143  case Decl::Typedef: // typedef int X;
144  case Decl::TypeAlias: { // using X = int; [C++0x]
145  const TypedefNameDecl &TD = cast<TypedefNameDecl>(D);
146  QualType Ty = TD.getUnderlyingType();
147 
148  if (Ty->isVariablyModifiedType())
150  }
151  }
152 }
153 
154 /// EmitVarDecl - This method handles emission of any variable declaration
155 /// inside a function, including static vars etc.
157  if (D.hasExternalStorage())
158  // Don't emit it now, allow it to be emitted lazily on its first use.
159  return;
160 
161  // Some function-scope variable does not have static storage but still
162  // needs to be emitted like a static variable, e.g. a function-scope
163  // variable in constant address space in OpenCL.
164  if (D.getStorageDuration() != SD_Automatic) {
165  // Static sampler variables translated to function calls.
166  if (D.getType()->isSamplerT())
167  return;
168 
169  llvm::GlobalValue::LinkageTypes Linkage =
170  CGM.getLLVMLinkageVarDefinition(&D, /*isConstant=*/false);
171 
172  // FIXME: We need to force the emission/use of a guard variable for
173  // some variables even if we can constant-evaluate them because
174  // we can't guarantee every translation unit will constant-evaluate them.
175 
176  return EmitStaticVarDecl(D, Linkage);
177  }
178 
181 
182  assert(D.hasLocalStorage());
183  return EmitAutoVarDecl(D);
184 }
185 
186 static std::string getStaticDeclName(CodeGenModule &CGM, const VarDecl &D) {
187  if (CGM.getLangOpts().CPlusPlus)
188  return CGM.getMangledName(&D).str();
189 
190  // If this isn't C++, we don't need a mangled name, just a pretty one.
191  assert(!D.isExternallyVisible() && "name shouldn't matter");
192  std::string ContextName;
193  const DeclContext *DC = D.getDeclContext();
194  if (auto *CD = dyn_cast<CapturedDecl>(DC))
195  DC = cast<DeclContext>(CD->getNonClosureContext());
196  if (const auto *FD = dyn_cast<FunctionDecl>(DC))
197  ContextName = CGM.getMangledName(FD);
198  else if (const auto *BD = dyn_cast<BlockDecl>(DC))
199  ContextName = CGM.getBlockMangledName(GlobalDecl(), BD);
200  else if (const auto *OMD = dyn_cast<ObjCMethodDecl>(DC))
201  ContextName = OMD->getSelector().getAsString();
202  else
203  llvm_unreachable("Unknown context for static var decl");
204 
205  ContextName += "." + D.getNameAsString();
206  return ContextName;
207 }
208 
210  const VarDecl &D, llvm::GlobalValue::LinkageTypes Linkage) {
211  // In general, we don't always emit static var decls once before we reference
212  // them. It is possible to reference them before emitting the function that
213  // contains them, and it is possible to emit the containing function multiple
214  // times.
215  if (llvm::Constant *ExistingGV = StaticLocalDeclMap[&D])
216  return ExistingGV;
217 
218  QualType Ty = D.getType();
219  assert(Ty->isConstantSizeType() && "VLAs can't be static");
220 
221  // Use the label if the variable is renamed with the asm-label extension.
222  std::string Name;
223  if (D.hasAttr<AsmLabelAttr>())
224  Name = getMangledName(&D);
225  else
226  Name = getStaticDeclName(*this, D);
227 
229  LangAS AS = GetGlobalVarAddressSpace(&D);
230  unsigned TargetAS = getContext().getTargetAddressSpace(AS);
231 
232  // OpenCL variables in local address space and CUDA shared
233  // variables cannot have an initializer.
234  llvm::Constant *Init = nullptr;
236  D.hasAttr<CUDASharedAttr>())
237  Init = llvm::UndefValue::get(LTy);
238  else
239  Init = EmitNullConstant(Ty);
240 
241  llvm::GlobalVariable *GV = new llvm::GlobalVariable(
242  getModule(), LTy, Ty.isConstant(getContext()), Linkage, Init, Name,
243  nullptr, llvm::GlobalVariable::NotThreadLocal, TargetAS);
244  GV->setAlignment(getContext().getDeclAlign(&D).getQuantity());
245 
246  if (supportsCOMDAT() && GV->isWeakForLinker())
247  GV->setComdat(TheModule.getOrInsertComdat(GV->getName()));
248 
249  if (D.getTLSKind())
250  setTLSMode(GV, D);
251 
252  setGVProperties(GV, &D);
253 
254  // Make sure the result is of the correct type.
255  LangAS ExpectedAS = Ty.getAddressSpace();
256  llvm::Constant *Addr = GV;
257  if (AS != ExpectedAS) {
258  Addr = getTargetCodeGenInfo().performAddrSpaceCast(
259  *this, GV, AS, ExpectedAS,
260  LTy->getPointerTo(getContext().getTargetAddressSpace(ExpectedAS)));
261  }
262 
263  setStaticLocalDeclAddress(&D, Addr);
264 
265  // Ensure that the static local gets initialized by making sure the parent
266  // function gets emitted eventually.
267  const Decl *DC = cast<Decl>(D.getDeclContext());
268 
269  // We can't name blocks or captured statements directly, so try to emit their
270  // parents.
271  if (isa<BlockDecl>(DC) || isa<CapturedDecl>(DC)) {
272  DC = DC->getNonClosureContext();
273  // FIXME: Ensure that global blocks get emitted.
274  if (!DC)
275  return Addr;
276  }
277 
278  GlobalDecl GD;
279  if (const auto *CD = dyn_cast<CXXConstructorDecl>(DC))
280  GD = GlobalDecl(CD, Ctor_Base);
281  else if (const auto *DD = dyn_cast<CXXDestructorDecl>(DC))
282  GD = GlobalDecl(DD, Dtor_Base);
283  else if (const auto *FD = dyn_cast<FunctionDecl>(DC))
284  GD = GlobalDecl(FD);
285  else {
286  // Don't do anything for Obj-C method decls or global closures. We should
287  // never defer them.
288  assert(isa<ObjCMethodDecl>(DC) && "unexpected parent code decl");
289  }
290  if (GD.getDecl()) {
291  // Disable emission of the parent function for the OpenMP device codegen.
293  (void)GetAddrOfGlobal(GD);
294  }
295 
296  return Addr;
297 }
298 
299 /// hasNontrivialDestruction - Determine whether a type's destruction is
300 /// non-trivial. If so, and the variable uses static initialization, we must
301 /// register its destructor to run on exit.
304  return RD && !RD->hasTrivialDestructor();
305 }
306 
307 /// AddInitializerToStaticVarDecl - Add the initializer for 'D' to the
308 /// global variable that has already been created for it. If the initializer
309 /// has a different type than GV does, this may free GV and return a different
310 /// one. Otherwise it just returns GV.
311 llvm::GlobalVariable *
313  llvm::GlobalVariable *GV) {
314  ConstantEmitter emitter(*this);
315  llvm::Constant *Init = emitter.tryEmitForInitializer(D);
316 
317  // If constant emission failed, then this should be a C++ static
318  // initializer.
319  if (!Init) {
320  if (!getLangOpts().CPlusPlus)
321  CGM.ErrorUnsupported(D.getInit(), "constant l-value expression");
322  else if (HaveInsertPoint()) {
323  // Since we have a static initializer, this global variable can't
324  // be constant.
325  GV->setConstant(false);
326 
327  EmitCXXGuardedInit(D, GV, /*PerformInit*/true);
328  }
329  return GV;
330  }
331 
332  // The initializer may differ in type from the global. Rewrite
333  // the global to match the initializer. (We have to do this
334  // because some types, like unions, can't be completely represented
335  // in the LLVM type system.)
336  if (GV->getType()->getElementType() != Init->getType()) {
337  llvm::GlobalVariable *OldGV = GV;
338 
339  GV = new llvm::GlobalVariable(CGM.getModule(), Init->getType(),
340  OldGV->isConstant(),
341  OldGV->getLinkage(), Init, "",
342  /*InsertBefore*/ OldGV,
343  OldGV->getThreadLocalMode(),
345  GV->setVisibility(OldGV->getVisibility());
346  GV->setDSOLocal(OldGV->isDSOLocal());
347  GV->setComdat(OldGV->getComdat());
348 
349  // Steal the name of the old global
350  GV->takeName(OldGV);
351 
352  // Replace all uses of the old global with the new global
353  llvm::Constant *NewPtrForOldDecl =
354  llvm::ConstantExpr::getBitCast(GV, OldGV->getType());
355  OldGV->replaceAllUsesWith(NewPtrForOldDecl);
356 
357  // Erase the old global, since it is no longer used.
358  OldGV->eraseFromParent();
359  }
360 
361  GV->setConstant(CGM.isTypeConstant(D.getType(), true));
362  GV->setInitializer(Init);
363 
364  emitter.finalize(GV);
365 
367  // We have a constant initializer, but a nontrivial destructor. We still
368  // need to perform a guarded "initialization" in order to register the
369  // destructor.
370  EmitCXXGuardedInit(D, GV, /*PerformInit*/false);
371  }
372 
373  return GV;
374 }
375 
377  llvm::GlobalValue::LinkageTypes Linkage) {
378  // Check to see if we already have a global variable for this
379  // declaration. This can happen when double-emitting function
380  // bodies, e.g. with complete and base constructors.
381  llvm::Constant *addr = CGM.getOrCreateStaticVarDecl(D, Linkage);
382  CharUnits alignment = getContext().getDeclAlign(&D);
383 
384  // Store into LocalDeclMap before generating initializer to handle
385  // circular references.
386  setAddrOfLocalVar(&D, Address(addr, alignment));
387 
388  // We can't have a VLA here, but we can have a pointer to a VLA,
389  // even though that doesn't really make any sense.
390  // Make sure to evaluate VLA bounds now so that we have them for later.
391  if (D.getType()->isVariablyModifiedType())
393 
394  // Save the type in case adding the initializer forces a type change.
395  llvm::Type *expectedType = addr->getType();
396 
397  llvm::GlobalVariable *var =
398  cast<llvm::GlobalVariable>(addr->stripPointerCasts());
399 
400  // CUDA's local and local static __shared__ variables should not
401  // have any non-empty initializers. This is ensured by Sema.
402  // Whatever initializer such variable may have when it gets here is
403  // a no-op and should not be emitted.
404  bool isCudaSharedVar = getLangOpts().CUDA && getLangOpts().CUDAIsDevice &&
405  D.hasAttr<CUDASharedAttr>();
406  // If this value has an initializer, emit it.
407  if (D.getInit() && !isCudaSharedVar)
408  var = AddInitializerToStaticVarDecl(D, var);
409 
410  var->setAlignment(alignment.getQuantity());
411 
412  if (D.hasAttr<AnnotateAttr>())
413  CGM.AddGlobalAnnotations(&D, var);
414 
415  if (auto *SA = D.getAttr<PragmaClangBSSSectionAttr>())
416  var->addAttribute("bss-section", SA->getName());
417  if (auto *SA = D.getAttr<PragmaClangDataSectionAttr>())
418  var->addAttribute("data-section", SA->getName());
419  if (auto *SA = D.getAttr<PragmaClangRodataSectionAttr>())
420  var->addAttribute("rodata-section", SA->getName());
421 
422  if (const SectionAttr *SA = D.getAttr<SectionAttr>())
423  var->setSection(SA->getName());
424 
425  if (D.hasAttr<UsedAttr>())
426  CGM.addUsedGlobal(var);
427 
428  // We may have to cast the constant because of the initializer
429  // mismatch above.
430  //
431  // FIXME: It is really dangerous to store this in the map; if anyone
432  // RAUW's the GV uses of this constant will be invalid.
433  llvm::Constant *castedAddr =
434  llvm::ConstantExpr::getPointerBitCastOrAddrSpaceCast(var, expectedType);
435  if (var != castedAddr)
436  LocalDeclMap.find(&D)->second = Address(castedAddr, alignment);
437  CGM.setStaticLocalDeclAddress(&D, castedAddr);
438 
440 
441  // Emit global variable debug descriptor for static vars.
442  CGDebugInfo *DI = getDebugInfo();
443  if (DI &&
445  DI->setLocation(D.getLocation());
446  DI->EmitGlobalVariable(var, &D);
447  }
448 }
449 
450 namespace {
451  struct DestroyObject final : EHScopeStack::Cleanup {
452  DestroyObject(Address addr, QualType type,
453  CodeGenFunction::Destroyer *destroyer,
454  bool useEHCleanupForArray)
455  : addr(addr), type(type), destroyer(destroyer),
456  useEHCleanupForArray(useEHCleanupForArray) {}
457 
458  Address addr;
459  QualType type;
460  CodeGenFunction::Destroyer *destroyer;
461  bool useEHCleanupForArray;
462 
463  void Emit(CodeGenFunction &CGF, Flags flags) override {
464  // Don't use an EH cleanup recursively from an EH cleanup.
465  bool useEHCleanupForArray =
466  flags.isForNormalCleanup() && this->useEHCleanupForArray;
467 
468  CGF.emitDestroy(addr, type, destroyer, useEHCleanupForArray);
469  }
470  };
471 
472  template <class Derived>
473  struct DestroyNRVOVariable : EHScopeStack::Cleanup {
474  DestroyNRVOVariable(Address addr, llvm::Value *NRVOFlag)
475  : NRVOFlag(NRVOFlag), Loc(addr) {}
476 
477  llvm::Value *NRVOFlag;
478  Address Loc;
479 
480  void Emit(CodeGenFunction &CGF, Flags flags) override {
481  // Along the exceptions path we always execute the dtor.
482  bool NRVO = flags.isForNormalCleanup() && NRVOFlag;
483 
484  llvm::BasicBlock *SkipDtorBB = nullptr;
485  if (NRVO) {
486  // If we exited via NRVO, we skip the destructor call.
487  llvm::BasicBlock *RunDtorBB = CGF.createBasicBlock("nrvo.unused");
488  SkipDtorBB = CGF.createBasicBlock("nrvo.skipdtor");
489  llvm::Value *DidNRVO =
490  CGF.Builder.CreateFlagLoad(NRVOFlag, "nrvo.val");
491  CGF.Builder.CreateCondBr(DidNRVO, SkipDtorBB, RunDtorBB);
492  CGF.EmitBlock(RunDtorBB);
493  }
494 
495  static_cast<Derived *>(this)->emitDestructorCall(CGF);
496 
497  if (NRVO) CGF.EmitBlock(SkipDtorBB);
498  }
499 
500  virtual ~DestroyNRVOVariable() = default;
501  };
502 
503  struct DestroyNRVOVariableCXX final
504  : DestroyNRVOVariable<DestroyNRVOVariableCXX> {
505  DestroyNRVOVariableCXX(Address addr, const CXXDestructorDecl *Dtor,
506  llvm::Value *NRVOFlag)
507  : DestroyNRVOVariable<DestroyNRVOVariableCXX>(addr, NRVOFlag),
508  Dtor(Dtor) {}
509 
510  const CXXDestructorDecl *Dtor;
511 
512  void emitDestructorCall(CodeGenFunction &CGF) {
514  /*ForVirtualBase=*/false,
515  /*Delegating=*/false, Loc);
516  }
517  };
518 
519  struct DestroyNRVOVariableC final
520  : DestroyNRVOVariable<DestroyNRVOVariableC> {
521  DestroyNRVOVariableC(Address addr, llvm::Value *NRVOFlag, QualType Ty)
522  : DestroyNRVOVariable<DestroyNRVOVariableC>(addr, NRVOFlag), Ty(Ty) {}
523 
524  QualType Ty;
525 
526  void emitDestructorCall(CodeGenFunction &CGF) {
527  CGF.destroyNonTrivialCStruct(CGF, Loc, Ty);
528  }
529  };
530 
531  struct CallStackRestore final : EHScopeStack::Cleanup {
532  Address Stack;
533  CallStackRestore(Address Stack) : Stack(Stack) {}
534  void Emit(CodeGenFunction &CGF, Flags flags) override {
535  llvm::Value *V = CGF.Builder.CreateLoad(Stack);
536  llvm::Value *F = CGF.CGM.getIntrinsic(llvm::Intrinsic::stackrestore);
537  CGF.Builder.CreateCall(F, V);
538  }
539  };
540 
541  struct ExtendGCLifetime final : EHScopeStack::Cleanup {
542  const VarDecl &Var;
543  ExtendGCLifetime(const VarDecl *var) : Var(*var) {}
544 
545  void Emit(CodeGenFunction &CGF, Flags flags) override {
546  // Compute the address of the local variable, in case it's a
547  // byref or something.
548  DeclRefExpr DRE(const_cast<VarDecl*>(&Var), false,
549  Var.getType(), VK_LValue, SourceLocation());
550  llvm::Value *value = CGF.EmitLoadOfScalar(CGF.EmitDeclRefLValue(&DRE),
551  SourceLocation());
552  CGF.EmitExtendGCLifetime(value);
553  }
554  };
555 
556  struct CallCleanupFunction final : EHScopeStack::Cleanup {
557  llvm::Constant *CleanupFn;
558  const CGFunctionInfo &FnInfo;
559  const VarDecl &Var;
560 
561  CallCleanupFunction(llvm::Constant *CleanupFn, const CGFunctionInfo *Info,
562  const VarDecl *Var)
563  : CleanupFn(CleanupFn), FnInfo(*Info), Var(*Var) {}
564 
565  void Emit(CodeGenFunction &CGF, Flags flags) override {
566  DeclRefExpr DRE(const_cast<VarDecl*>(&Var), false,
567  Var.getType(), VK_LValue, SourceLocation());
568  // Compute the address of the local variable, in case it's a byref
569  // or something.
570  llvm::Value *Addr = CGF.EmitDeclRefLValue(&DRE).getPointer();
571 
572  // In some cases, the type of the function argument will be different from
573  // the type of the pointer. An example of this is
574  // void f(void* arg);
575  // __attribute__((cleanup(f))) void *g;
576  //
577  // To fix this we insert a bitcast here.
578  QualType ArgTy = FnInfo.arg_begin()->type;
579  llvm::Value *Arg =
580  CGF.Builder.CreateBitCast(Addr, CGF.ConvertType(ArgTy));
581 
582  CallArgList Args;
583  Args.add(RValue::get(Arg),
584  CGF.getContext().getPointerType(Var.getType()));
585  auto Callee = CGCallee::forDirect(CleanupFn);
586  CGF.EmitCall(FnInfo, Callee, ReturnValueSlot(), Args);
587  }
588  };
589 } // end anonymous namespace
590 
591 /// EmitAutoVarWithLifetime - Does the setup required for an automatic
592 /// variable with lifetime.
593 static void EmitAutoVarWithLifetime(CodeGenFunction &CGF, const VarDecl &var,
594  Address addr,
595  Qualifiers::ObjCLifetime lifetime) {
596  switch (lifetime) {
598  llvm_unreachable("present but none");
599 
601  // nothing to do
602  break;
603 
604  case Qualifiers::OCL_Strong: {
605  CodeGenFunction::Destroyer *destroyer =
606  (var.hasAttr<ObjCPreciseLifetimeAttr>()
609 
610  CleanupKind cleanupKind = CGF.getARCCleanupKind();
611  CGF.pushDestroy(cleanupKind, addr, var.getType(), destroyer,
612  cleanupKind & EHCleanup);
613  break;
614  }
616  // nothing to do
617  break;
618 
620  // __weak objects always get EH cleanups; otherwise, exceptions
621  // could cause really nasty crashes instead of mere leaks.
622  CGF.pushDestroy(NormalAndEHCleanup, addr, var.getType(),
624  /*useEHCleanup*/ true);
625  break;
626  }
627 }
628 
629 static bool isAccessedBy(const VarDecl &var, const Stmt *s) {
630  if (const Expr *e = dyn_cast<Expr>(s)) {
631  // Skip the most common kinds of expressions that make
632  // hierarchy-walking expensive.
633  s = e = e->IgnoreParenCasts();
634 
635  if (const DeclRefExpr *ref = dyn_cast<DeclRefExpr>(e))
636  return (ref->getDecl() == &var);
637  if (const BlockExpr *be = dyn_cast<BlockExpr>(e)) {
638  const BlockDecl *block = be->getBlockDecl();
639  for (const auto &I : block->captures()) {
640  if (I.getVariable() == &var)
641  return true;
642  }
643  }
644  }
645 
646  for (const Stmt *SubStmt : s->children())
647  // SubStmt might be null; as in missing decl or conditional of an if-stmt.
648  if (SubStmt && isAccessedBy(var, SubStmt))
649  return true;
650 
651  return false;
652 }
653 
654 static bool isAccessedBy(const ValueDecl *decl, const Expr *e) {
655  if (!decl) return false;
656  if (!isa<VarDecl>(decl)) return false;
657  const VarDecl *var = cast<VarDecl>(decl);
658  return isAccessedBy(*var, e);
659 }
660 
662  const LValue &destLV, const Expr *init) {
663  bool needsCast = false;
664 
665  while (auto castExpr = dyn_cast<CastExpr>(init->IgnoreParens())) {
666  switch (castExpr->getCastKind()) {
667  // Look through casts that don't require representation changes.
668  case CK_NoOp:
669  case CK_BitCast:
670  case CK_BlockPointerToObjCPointerCast:
671  needsCast = true;
672  break;
673 
674  // If we find an l-value to r-value cast from a __weak variable,
675  // emit this operation as a copy or move.
676  case CK_LValueToRValue: {
677  const Expr *srcExpr = castExpr->getSubExpr();
678  if (srcExpr->getType().getObjCLifetime() != Qualifiers::OCL_Weak)
679  return false;
680 
681  // Emit the source l-value.
682  LValue srcLV = CGF.EmitLValue(srcExpr);
683 
684  // Handle a formal type change to avoid asserting.
685  auto srcAddr = srcLV.getAddress();
686  if (needsCast) {
687  srcAddr = CGF.Builder.CreateElementBitCast(srcAddr,
688  destLV.getAddress().getElementType());
689  }
690 
691  // If it was an l-value, use objc_copyWeak.
692  if (srcExpr->getValueKind() == VK_LValue) {
693  CGF.EmitARCCopyWeak(destLV.getAddress(), srcAddr);
694  } else {
695  assert(srcExpr->getValueKind() == VK_XValue);
696  CGF.EmitARCMoveWeak(destLV.getAddress(), srcAddr);
697  }
698  return true;
699  }
700 
701  // Stop at anything else.
702  default:
703  return false;
704  }
705 
706  init = castExpr->getSubExpr();
707  }
708  return false;
709 }
710 
712  LValue &lvalue,
713  const VarDecl *var) {
714  lvalue.setAddress(CGF.emitBlockByrefAddress(lvalue.getAddress(), var));
715 }
716 
718  SourceLocation Loc) {
719  if (!SanOpts.has(SanitizerKind::NullabilityAssign))
720  return;
721 
722  auto Nullability = LHS.getType()->getNullability(getContext());
724  return;
725 
726  // Check if the right hand side of the assignment is nonnull, if the left
727  // hand side must be nonnull.
728  SanitizerScope SanScope(this);
729  llvm::Value *IsNotNull = Builder.CreateIsNotNull(RHS);
730  llvm::Constant *StaticData[] = {
732  llvm::ConstantInt::get(Int8Ty, 0), // The LogAlignment info is unused.
733  llvm::ConstantInt::get(Int8Ty, TCK_NonnullAssign)};
734  EmitCheck({{IsNotNull, SanitizerKind::NullabilityAssign}},
735  SanitizerHandler::TypeMismatch, StaticData, RHS);
736 }
737 
738 void CodeGenFunction::EmitScalarInit(const Expr *init, const ValueDecl *D,
739  LValue lvalue, bool capturedByInit) {
740  Qualifiers::ObjCLifetime lifetime = lvalue.getObjCLifetime();
741  if (!lifetime) {
742  llvm::Value *value = EmitScalarExpr(init);
743  if (capturedByInit)
744  drillIntoBlockVariable(*this, lvalue, cast<VarDecl>(D));
745  EmitNullabilityCheck(lvalue, value, init->getExprLoc());
746  EmitStoreThroughLValue(RValue::get(value), lvalue, true);
747  return;
748  }
749 
750  if (const CXXDefaultInitExpr *DIE = dyn_cast<CXXDefaultInitExpr>(init))
751  init = DIE->getExpr();
752 
753  // If we're emitting a value with lifetime, we have to do the
754  // initialization *before* we leave the cleanup scopes.
755  if (const ExprWithCleanups *ewc = dyn_cast<ExprWithCleanups>(init)) {
756  enterFullExpression(ewc);
757  init = ewc->getSubExpr();
758  }
760 
761  // We have to maintain the illusion that the variable is
762  // zero-initialized. If the variable might be accessed in its
763  // initializer, zero-initialize before running the initializer, then
764  // actually perform the initialization with an assign.
765  bool accessedByInit = false;
766  if (lifetime != Qualifiers::OCL_ExplicitNone)
767  accessedByInit = (capturedByInit || isAccessedBy(D, init));
768  if (accessedByInit) {
769  LValue tempLV = lvalue;
770  // Drill down to the __block object if necessary.
771  if (capturedByInit) {
772  // We can use a simple GEP for this because it can't have been
773  // moved yet.
775  cast<VarDecl>(D),
776  /*follow*/ false));
777  }
778 
779  auto ty = cast<llvm::PointerType>(tempLV.getAddress().getElementType());
780  llvm::Value *zero = CGM.getNullPointer(ty, tempLV.getType());
781 
782  // If __weak, we want to use a barrier under certain conditions.
783  if (lifetime == Qualifiers::OCL_Weak)
784  EmitARCInitWeak(tempLV.getAddress(), zero);
785 
786  // Otherwise just do a simple store.
787  else
788  EmitStoreOfScalar(zero, tempLV, /* isInitialization */ true);
789  }
790 
791  // Emit the initializer.
792  llvm::Value *value = nullptr;
793 
794  switch (lifetime) {
796  llvm_unreachable("present but none");
797 
799  value = EmitARCUnsafeUnretainedScalarExpr(init);
800  break;
801 
802  case Qualifiers::OCL_Strong: {
803  value = EmitARCRetainScalarExpr(init);
804  break;
805  }
806 
807  case Qualifiers::OCL_Weak: {
808  // If it's not accessed by the initializer, try to emit the
809  // initialization with a copy or move.
810  if (!accessedByInit && tryEmitARCCopyWeakInit(*this, lvalue, init)) {
811  return;
812  }
813 
814  // No way to optimize a producing initializer into this. It's not
815  // worth optimizing for, because the value will immediately
816  // disappear in the common case.
817  value = EmitScalarExpr(init);
818 
819  if (capturedByInit) drillIntoBlockVariable(*this, lvalue, cast<VarDecl>(D));
820  if (accessedByInit)
821  EmitARCStoreWeak(lvalue.getAddress(), value, /*ignored*/ true);
822  else
823  EmitARCInitWeak(lvalue.getAddress(), value);
824  return;
825  }
826 
829  break;
830  }
831 
832  if (capturedByInit) drillIntoBlockVariable(*this, lvalue, cast<VarDecl>(D));
833 
834  EmitNullabilityCheck(lvalue, value, init->getExprLoc());
835 
836  // If the variable might have been accessed by its initializer, we
837  // might have to initialize with a barrier. We have to do this for
838  // both __weak and __strong, but __weak got filtered out above.
839  if (accessedByInit && lifetime == Qualifiers::OCL_Strong) {
840  llvm::Value *oldValue = EmitLoadOfScalar(lvalue, init->getExprLoc());
841  EmitStoreOfScalar(value, lvalue, /* isInitialization */ true);
843  return;
844  }
845 
846  EmitStoreOfScalar(value, lvalue, /* isInitialization */ true);
847 }
848 
849 /// canEmitInitWithFewStoresAfterMemset - Decide whether we can emit the
850 /// non-zero parts of the specified initializer with equal or fewer than
851 /// NumStores scalar stores.
852 static bool canEmitInitWithFewStoresAfterMemset(llvm::Constant *Init,
853  unsigned &NumStores) {
854  // Zero and Undef never requires any extra stores.
855  if (isa<llvm::ConstantAggregateZero>(Init) ||
856  isa<llvm::ConstantPointerNull>(Init) ||
857  isa<llvm::UndefValue>(Init))
858  return true;
859  if (isa<llvm::ConstantInt>(Init) || isa<llvm::ConstantFP>(Init) ||
860  isa<llvm::ConstantVector>(Init) || isa<llvm::BlockAddress>(Init) ||
861  isa<llvm::ConstantExpr>(Init))
862  return Init->isNullValue() || NumStores--;
863 
864  // See if we can emit each element.
865  if (isa<llvm::ConstantArray>(Init) || isa<llvm::ConstantStruct>(Init)) {
866  for (unsigned i = 0, e = Init->getNumOperands(); i != e; ++i) {
867  llvm::Constant *Elt = cast<llvm::Constant>(Init->getOperand(i));
868  if (!canEmitInitWithFewStoresAfterMemset(Elt, NumStores))
869  return false;
870  }
871  return true;
872  }
873 
874  if (llvm::ConstantDataSequential *CDS =
875  dyn_cast<llvm::ConstantDataSequential>(Init)) {
876  for (unsigned i = 0, e = CDS->getNumElements(); i != e; ++i) {
877  llvm::Constant *Elt = CDS->getElementAsConstant(i);
878  if (!canEmitInitWithFewStoresAfterMemset(Elt, NumStores))
879  return false;
880  }
881  return true;
882  }
883 
884  // Anything else is hard and scary.
885  return false;
886 }
887 
888 /// emitStoresForInitAfterMemset - For inits that
889 /// canEmitInitWithFewStoresAfterMemset returned true for, emit the scalar
890 /// stores that would be required.
891 static void emitStoresForInitAfterMemset(llvm::Constant *Init, llvm::Value *Loc,
892  bool isVolatile, CGBuilderTy &Builder) {
893  assert(!Init->isNullValue() && !isa<llvm::UndefValue>(Init) &&
894  "called emitStoresForInitAfterMemset for zero or undef value.");
895 
896  if (isa<llvm::ConstantInt>(Init) || isa<llvm::ConstantFP>(Init) ||
897  isa<llvm::ConstantVector>(Init) || isa<llvm::BlockAddress>(Init) ||
898  isa<llvm::ConstantExpr>(Init)) {
899  Builder.CreateDefaultAlignedStore(Init, Loc, isVolatile);
900  return;
901  }
902 
903  if (llvm::ConstantDataSequential *CDS =
904  dyn_cast<llvm::ConstantDataSequential>(Init)) {
905  for (unsigned i = 0, e = CDS->getNumElements(); i != e; ++i) {
906  llvm::Constant *Elt = CDS->getElementAsConstant(i);
907 
908  // If necessary, get a pointer to the element and emit it.
909  if (!Elt->isNullValue() && !isa<llvm::UndefValue>(Elt))
911  Elt, Builder.CreateConstGEP2_32(Init->getType(), Loc, 0, i),
912  isVolatile, Builder);
913  }
914  return;
915  }
916 
917  assert((isa<llvm::ConstantStruct>(Init) || isa<llvm::ConstantArray>(Init)) &&
918  "Unknown value type!");
919 
920  for (unsigned i = 0, e = Init->getNumOperands(); i != e; ++i) {
921  llvm::Constant *Elt = cast<llvm::Constant>(Init->getOperand(i));
922 
923  // If necessary, get a pointer to the element and emit it.
924  if (!Elt->isNullValue() && !isa<llvm::UndefValue>(Elt))
926  Elt, Builder.CreateConstGEP2_32(Init->getType(), Loc, 0, i),
927  isVolatile, Builder);
928  }
929 }
930 
931 /// shouldUseMemSetPlusStoresToInitialize - Decide whether we should use memset
932 /// plus some stores to initialize a local variable instead of using a memcpy
933 /// from a constant global. It is beneficial to use memset if the global is all
934 /// zeros, or mostly zeros and large.
935 static bool shouldUseMemSetPlusStoresToInitialize(llvm::Constant *Init,
936  uint64_t GlobalSize) {
937  // If a global is all zeros, always use a memset.
938  if (isa<llvm::ConstantAggregateZero>(Init)) return true;
939 
940  // If a non-zero global is <= 32 bytes, always use a memcpy. If it is large,
941  // do it if it will require 6 or fewer scalar stores.
942  // TODO: Should budget depends on the size? Avoiding a large global warrants
943  // plopping in more stores.
944  unsigned StoreBudget = 6;
945  uint64_t SizeLimit = 32;
946 
947  return GlobalSize > SizeLimit &&
948  canEmitInitWithFewStoresAfterMemset(Init, StoreBudget);
949 }
950 
951 /// EmitAutoVarDecl - Emit code and set up an entry in LocalDeclMap for a
952 /// variable declaration with auto, register, or no storage class specifier.
953 /// These turn into simple stack objects, or GlobalValues depending on target.
955  AutoVarEmission emission = EmitAutoVarAlloca(D);
956  EmitAutoVarInit(emission);
957  EmitAutoVarCleanups(emission);
958 }
959 
960 /// Emit a lifetime.begin marker if some criteria are satisfied.
961 /// \return a pointer to the temporary size Value if a marker was emitted, null
962 /// otherwise
964  llvm::Value *Addr) {
965  if (!ShouldEmitLifetimeMarkers)
966  return nullptr;
967 
968  llvm::Value *SizeV = llvm::ConstantInt::get(Int64Ty, Size);
969  Addr = Builder.CreateBitCast(Addr, AllocaInt8PtrTy);
970  llvm::CallInst *C =
971  Builder.CreateCall(CGM.getLLVMLifetimeStartFn(), {SizeV, Addr});
972  C->setDoesNotThrow();
973  return SizeV;
974 }
975 
977  Addr = Builder.CreateBitCast(Addr, AllocaInt8PtrTy);
978  llvm::CallInst *C =
979  Builder.CreateCall(CGM.getLLVMLifetimeEndFn(), {Size, Addr});
980  C->setDoesNotThrow();
981 }
982 
984  CGDebugInfo *DI, const VarDecl &D, bool EmitDebugInfo) {
985  // For each dimension stores its QualType and corresponding
986  // size-expression Value.
988 
989  // Break down the array into individual dimensions.
990  QualType Type1D = D.getType();
991  while (getContext().getAsVariableArrayType(Type1D)) {
992  auto VlaSize = getVLAElements1D(Type1D);
993  if (auto *C = dyn_cast<llvm::ConstantInt>(VlaSize.NumElts))
994  Dimensions.emplace_back(C, Type1D.getUnqualifiedType());
995  else {
996  auto SizeExprAddr = CreateDefaultAlignTempAlloca(
997  VlaSize.NumElts->getType(), "__vla_expr");
998  Builder.CreateStore(VlaSize.NumElts, SizeExprAddr);
999  Dimensions.emplace_back(SizeExprAddr.getPointer(),
1000  Type1D.getUnqualifiedType());
1001  }
1002  Type1D = VlaSize.Type;
1003  }
1004 
1005  if (!EmitDebugInfo)
1006  return;
1007 
1008  // Register each dimension's size-expression with a DILocalVariable,
1009  // so that it can be used by CGDebugInfo when instantiating a DISubrange
1010  // to describe this array.
1011  for (auto &VlaSize : Dimensions) {
1012  llvm::Metadata *MD;
1013  if (auto *C = dyn_cast<llvm::ConstantInt>(VlaSize.NumElts))
1014  MD = llvm::ConstantAsMetadata::get(C);
1015  else {
1016  // Create an artificial VarDecl to generate debug info for.
1017  IdentifierInfo &NameIdent = getContext().Idents.getOwn(
1018  cast<llvm::AllocaInst>(VlaSize.NumElts)->getName());
1019  auto VlaExprTy = VlaSize.NumElts->getType()->getPointerElementType();
1020  auto QT = getContext().getIntTypeForBitwidth(
1021  VlaExprTy->getScalarSizeInBits(), false);
1022  auto *ArtificialDecl = VarDecl::Create(
1023  getContext(), const_cast<DeclContext *>(D.getDeclContext()),
1024  D.getLocation(), D.getLocation(), &NameIdent, QT,
1026  ArtificialDecl->setImplicit();
1027 
1028  MD = DI->EmitDeclareOfAutoVariable(ArtificialDecl, VlaSize.NumElts,
1029  Builder);
1030  }
1031  assert(MD && "No Size expression debug node created");
1032  DI->registerVLASizeExpression(VlaSize.Type, MD);
1033  }
1034 }
1035 
1036 /// EmitAutoVarAlloca - Emit the alloca and debug information for a
1037 /// local variable. Does not emit initialization or destruction.
1040  QualType Ty = D.getType();
1041  assert(
1042  Ty.getAddressSpace() == LangAS::Default ||
1043  (Ty.getAddressSpace() == LangAS::opencl_private && getLangOpts().OpenCL));
1044 
1045  AutoVarEmission emission(D);
1046 
1047  bool isByRef = D.hasAttr<BlocksAttr>();
1048  emission.IsByRef = isByRef;
1049 
1050  CharUnits alignment = getContext().getDeclAlign(&D);
1051 
1052  // If the type is variably-modified, emit all the VLA sizes for it.
1053  if (Ty->isVariablyModifiedType())
1055 
1056  auto *DI = getDebugInfo();
1057  bool EmitDebugInfo = DI && CGM.getCodeGenOpts().getDebugInfo() >=
1059 
1060  Address address = Address::invalid();
1061  if (Ty->isConstantSizeType()) {
1062  bool NRVO = getLangOpts().ElideConstructors &&
1063  D.isNRVOVariable();
1064 
1065  // If this value is an array or struct with a statically determinable
1066  // constant initializer, there are optimizations we can do.
1067  //
1068  // TODO: We should constant-evaluate the initializer of any variable,
1069  // as long as it is initialized by a constant expression. Currently,
1070  // isConstantInitializer produces wrong answers for structs with
1071  // reference or bitfield members, and a few other cases, and checking
1072  // for POD-ness protects us from some of these.
1073  if (D.getInit() && (Ty->isArrayType() || Ty->isRecordType()) &&
1074  (D.isConstexpr() ||
1075  ((Ty.isPODType(getContext()) ||
1077  D.getInit()->isConstantInitializer(getContext(), false)))) {
1078 
1079  // If the variable's a const type, and it's neither an NRVO
1080  // candidate nor a __block variable and has no mutable members,
1081  // emit it as a global instead.
1082  // Exception is if a variable is located in non-constant address space
1083  // in OpenCL.
1084  if ((!getLangOpts().OpenCL ||
1086  (CGM.getCodeGenOpts().MergeAllConstants && !NRVO && !isByRef &&
1087  CGM.isTypeConstant(Ty, true))) {
1089 
1090  // Signal this condition to later callbacks.
1091  emission.Addr = Address::invalid();
1092  assert(emission.wasEmittedAsGlobal());
1093  return emission;
1094  }
1095 
1096  // Otherwise, tell the initialization code that we're in this case.
1097  emission.IsConstantAggregate = true;
1098  }
1099 
1100  // A normal fixed sized variable becomes an alloca in the entry block,
1101  // unless:
1102  // - it's an NRVO variable.
1103  // - we are compiling OpenMP and it's an OpenMP local variable.
1104 
1105  Address OpenMPLocalAddr =
1106  getLangOpts().OpenMP
1107  ? CGM.getOpenMPRuntime().getAddressOfLocalVariable(*this, &D)
1108  : Address::invalid();
1109  if (getLangOpts().OpenMP && OpenMPLocalAddr.isValid()) {
1110  address = OpenMPLocalAddr;
1111  } else if (NRVO) {
1112  // The named return value optimization: allocate this variable in the
1113  // return slot, so that we can elide the copy when returning this
1114  // variable (C++0x [class.copy]p34).
1115  address = ReturnValue;
1116 
1117  if (const RecordType *RecordTy = Ty->getAs<RecordType>()) {
1118  const auto *RD = RecordTy->getDecl();
1119  const auto *CXXRD = dyn_cast<CXXRecordDecl>(RD);
1120  if ((CXXRD && !CXXRD->hasTrivialDestructor()) ||
1121  RD->isNonTrivialToPrimitiveDestroy()) {
1122  // Create a flag that is used to indicate when the NRVO was applied
1123  // to this variable. Set it to zero to indicate that NRVO was not
1124  // applied.
1125  llvm::Value *Zero = Builder.getFalse();
1126  Address NRVOFlag =
1127  CreateTempAlloca(Zero->getType(), CharUnits::One(), "nrvo");
1129  Builder.CreateStore(Zero, NRVOFlag);
1130 
1131  // Record the NRVO flag for this variable.
1132  NRVOFlags[&D] = NRVOFlag.getPointer();
1133  emission.NRVOFlag = NRVOFlag.getPointer();
1134  }
1135  }
1136  } else {
1137  CharUnits allocaAlignment;
1138  llvm::Type *allocaTy;
1139  if (isByRef) {
1140  auto &byrefInfo = getBlockByrefInfo(&D);
1141  allocaTy = byrefInfo.Type;
1142  allocaAlignment = byrefInfo.ByrefAlignment;
1143  } else {
1144  allocaTy = ConvertTypeForMem(Ty);
1145  allocaAlignment = alignment;
1146  }
1147 
1148  // Create the alloca. Note that we set the name separately from
1149  // building the instruction so that it's there even in no-asserts
1150  // builds.
1151  address = CreateTempAlloca(allocaTy, allocaAlignment, D.getName());
1152 
1153  // Don't emit lifetime markers for MSVC catch parameters. The lifetime of
1154  // the catch parameter starts in the catchpad instruction, and we can't
1155  // insert code in those basic blocks.
1156  bool IsMSCatchParam =
1158 
1159  // Emit a lifetime intrinsic if meaningful. There's no point in doing this
1160  // if we don't have a valid insertion point (?).
1161  if (HaveInsertPoint() && !IsMSCatchParam) {
1162  // If there's a jump into the lifetime of this variable, its lifetime
1163  // gets broken up into several regions in IR, which requires more work
1164  // to handle correctly. For now, just omit the intrinsics; this is a
1165  // rare case, and it's better to just be conservatively correct.
1166  // PR28267.
1167  //
1168  // We have to do this in all language modes if there's a jump past the
1169  // declaration. We also have to do it in C if there's a jump to an
1170  // earlier point in the current block because non-VLA lifetimes begin as
1171  // soon as the containing block is entered, not when its variables
1172  // actually come into scope; suppressing the lifetime annotations
1173  // completely in this case is unnecessarily pessimistic, but again, this
1174  // is rare.
1175  if (!Bypasses.IsBypassed(&D) &&
1176  !(!getLangOpts().CPlusPlus && hasLabelBeenSeenInCurrentScope())) {
1177  uint64_t size = CGM.getDataLayout().getTypeAllocSize(allocaTy);
1178  emission.SizeForLifetimeMarkers =
1179  EmitLifetimeStart(size, address.getPointer());
1180  }
1181  } else {
1182  assert(!emission.useLifetimeMarkers());
1183  }
1184  }
1185  } else {
1187 
1188  if (!DidCallStackSave) {
1189  // Save the stack.
1190  Address Stack =
1191  CreateTempAlloca(Int8PtrTy, getPointerAlign(), "saved_stack");
1192 
1193  llvm::Value *F = CGM.getIntrinsic(llvm::Intrinsic::stacksave);
1194  llvm::Value *V = Builder.CreateCall(F);
1195  Builder.CreateStore(V, Stack);
1196 
1197  DidCallStackSave = true;
1198 
1199  // Push a cleanup block and restore the stack there.
1200  // FIXME: in general circumstances, this should be an EH cleanup.
1202  }
1203 
1204  auto VlaSize = getVLASize(Ty);
1205  llvm::Type *llvmTy = ConvertTypeForMem(VlaSize.Type);
1206 
1207  // Allocate memory for the array.
1208  address = CreateTempAlloca(llvmTy, alignment, "vla", VlaSize.NumElts);
1209 
1210  // If we have debug info enabled, properly describe the VLA dimensions for
1211  // this type by registering the vla size expression for each of the
1212  // dimensions.
1213  EmitAndRegisterVariableArrayDimensions(DI, D, EmitDebugInfo);
1214  }
1215 
1216  setAddrOfLocalVar(&D, address);
1217  emission.Addr = address;
1218 
1219  // Emit debug info for local var declaration.
1220  if (EmitDebugInfo && HaveInsertPoint()) {
1221  DI->setLocation(D.getLocation());
1222  (void)DI->EmitDeclareOfAutoVariable(&D, address.getPointer(), Builder);
1223  }
1224 
1225  if (D.hasAttr<AnnotateAttr>())
1226  EmitVarAnnotations(&D, address.getPointer());
1227 
1228  // Make sure we call @llvm.lifetime.end.
1229  if (emission.useLifetimeMarkers())
1231  emission.getAllocatedAddress(),
1232  emission.getSizeForLifetimeMarkers());
1233 
1234  return emission;
1235 }
1236 
1237 /// Determines whether the given __block variable is potentially
1238 /// captured by the given expression.
1239 static bool isCapturedBy(const VarDecl &var, const Expr *e) {
1240  // Skip the most common kinds of expressions that make
1241  // hierarchy-walking expensive.
1242  e = e->IgnoreParenCasts();
1243 
1244  if (const BlockExpr *be = dyn_cast<BlockExpr>(e)) {
1245  const BlockDecl *block = be->getBlockDecl();
1246  for (const auto &I : block->captures()) {
1247  if (I.getVariable() == &var)
1248  return true;
1249  }
1250 
1251  // No need to walk into the subexpressions.
1252  return false;
1253  }
1254 
1255  if (const StmtExpr *SE = dyn_cast<StmtExpr>(e)) {
1256  const CompoundStmt *CS = SE->getSubStmt();
1257  for (const auto *BI : CS->body())
1258  if (const auto *E = dyn_cast<Expr>(BI)) {
1259  if (isCapturedBy(var, E))
1260  return true;
1261  }
1262  else if (const auto *DS = dyn_cast<DeclStmt>(BI)) {
1263  // special case declarations
1264  for (const auto *I : DS->decls()) {
1265  if (const auto *VD = dyn_cast<VarDecl>((I))) {
1266  const Expr *Init = VD->getInit();
1267  if (Init && isCapturedBy(var, Init))
1268  return true;
1269  }
1270  }
1271  }
1272  else
1273  // FIXME. Make safe assumption assuming arbitrary statements cause capturing.
1274  // Later, provide code to poke into statements for capture analysis.
1275  return true;
1276  return false;
1277  }
1278 
1279  for (const Stmt *SubStmt : e->children())
1280  if (isCapturedBy(var, cast<Expr>(SubStmt)))
1281  return true;
1282 
1283  return false;
1284 }
1285 
1286 /// \brief Determine whether the given initializer is trivial in the sense
1287 /// that it requires no code to be generated.
1289  if (!Init)
1290  return true;
1291 
1292  if (const CXXConstructExpr *Construct = dyn_cast<CXXConstructExpr>(Init))
1293  if (CXXConstructorDecl *Constructor = Construct->getConstructor())
1294  if (Constructor->isTrivial() &&
1295  Constructor->isDefaultConstructor() &&
1296  !Construct->requiresZeroInitialization())
1297  return true;
1298 
1299  return false;
1300 }
1301 
1303  assert(emission.Variable && "emission was not valid!");
1304 
1305  // If this was emitted as a global constant, we're done.
1306  if (emission.wasEmittedAsGlobal()) return;
1307 
1308  const VarDecl &D = *emission.Variable;
1310  QualType type = D.getType();
1311 
1312  // If this local has an initializer, emit it now.
1313  const Expr *Init = D.getInit();
1314 
1315  // If we are at an unreachable point, we don't need to emit the initializer
1316  // unless it contains a label.
1317  if (!HaveInsertPoint()) {
1318  if (!Init || !ContainsLabel(Init)) return;
1320  }
1321 
1322  // Initialize the structure of a __block variable.
1323  if (emission.IsByRef)
1324  emitByrefStructureInit(emission);
1325 
1326  // Initialize the variable here if it doesn't have a initializer and it is a
1327  // C struct that is non-trivial to initialize or an array containing such a
1328  // struct.
1329  if (!Init &&
1330  type.isNonTrivialToPrimitiveDefaultInitialize() ==
1332  LValue Dst = MakeAddrLValue(emission.getAllocatedAddress(), type);
1333  if (emission.IsByRef)
1334  drillIntoBlockVariable(*this, Dst, &D);
1336  return;
1337  }
1338 
1339  if (isTrivialInitializer(Init))
1340  return;
1341 
1342  // Check whether this is a byref variable that's potentially
1343  // captured and moved by its own initializer. If so, we'll need to
1344  // emit the initializer first, then copy into the variable.
1345  bool capturedByInit = emission.IsByRef && isCapturedBy(D, Init);
1346 
1347  Address Loc =
1348  capturedByInit ? emission.Addr : emission.getObjectAddress(*this);
1349 
1350  llvm::Constant *constant = nullptr;
1351  if (emission.IsConstantAggregate || D.isConstexpr()) {
1352  assert(!capturedByInit && "constant init contains a capturing block?");
1353  constant = ConstantEmitter(*this).tryEmitAbstractForInitializer(D);
1354  }
1355 
1356  if (!constant) {
1357  LValue lv = MakeAddrLValue(Loc, type);
1358  lv.setNonGC(true);
1359  return EmitExprAsInit(Init, &D, lv, capturedByInit);
1360  }
1361 
1362  if (!emission.IsConstantAggregate) {
1363  // For simple scalar/complex initialization, store the value directly.
1364  LValue lv = MakeAddrLValue(Loc, type);
1365  lv.setNonGC(true);
1366  return EmitStoreThroughLValue(RValue::get(constant), lv, true);
1367  }
1368 
1369  // If this is a simple aggregate initialization, we can optimize it
1370  // in various ways.
1371  bool isVolatile = type.isVolatileQualified();
1372 
1373  llvm::Value *SizeVal =
1374  llvm::ConstantInt::get(IntPtrTy,
1375  getContext().getTypeSizeInChars(type).getQuantity());
1376 
1378  if (Loc.getType() != BP)
1379  Loc = Builder.CreateBitCast(Loc, BP);
1380 
1381  // If the initializer is all or mostly zeros, codegen with memset then do
1382  // a few stores afterward.
1384  CGM.getDataLayout().getTypeAllocSize(constant->getType()))) {
1385  Builder.CreateMemSet(Loc, llvm::ConstantInt::get(Int8Ty, 0), SizeVal,
1386  isVolatile);
1387  // Zero and undef don't require a stores.
1388  if (!constant->isNullValue() && !isa<llvm::UndefValue>(constant)) {
1389  Loc = Builder.CreateBitCast(Loc,
1390  constant->getType()->getPointerTo(Loc.getAddressSpace()));
1391  emitStoresForInitAfterMemset(constant, Loc.getPointer(),
1392  isVolatile, Builder);
1393  }
1394  } else {
1395  // Otherwise, create a temporary global with the initializer then
1396  // memcpy from the global to the alloca.
1397  std::string Name = getStaticDeclName(CGM, D);
1398  unsigned AS = 0;
1399  if (getLangOpts().OpenCL) {
1401  BP = llvm::PointerType::getInt8PtrTy(getLLVMContext(), AS);
1402  }
1403  llvm::GlobalVariable *GV =
1404  new llvm::GlobalVariable(CGM.getModule(), constant->getType(), true,
1405  llvm::GlobalValue::PrivateLinkage,
1406  constant, Name, nullptr,
1407  llvm::GlobalValue::NotThreadLocal, AS);
1408  GV->setAlignment(Loc.getAlignment().getQuantity());
1409  GV->setUnnamedAddr(llvm::GlobalValue::UnnamedAddr::Global);
1410 
1411  Address SrcPtr = Address(GV, Loc.getAlignment());
1412  if (SrcPtr.getType() != BP)
1413  SrcPtr = Builder.CreateBitCast(SrcPtr, BP);
1414 
1415  Builder.CreateMemCpy(Loc, SrcPtr, SizeVal, isVolatile);
1416  }
1417 }
1418 
1419 /// Emit an expression as an initializer for an object (variable, field, etc.)
1420 /// at the given location. The expression is not necessarily the normal
1421 /// initializer for the object, and the address is not necessarily
1422 /// its normal location.
1423 ///
1424 /// \param init the initializing expression
1425 /// \param D the object to act as if we're initializing
1426 /// \param loc the address to initialize; its type is a pointer
1427 /// to the LLVM mapping of the object's type
1428 /// \param alignment the alignment of the address
1429 /// \param capturedByInit true if \p D is a __block variable
1430 /// whose address is potentially changed by the initializer
1432  LValue lvalue, bool capturedByInit) {
1433  QualType type = D->getType();
1434 
1435  if (type->isReferenceType()) {
1436  RValue rvalue = EmitReferenceBindingToExpr(init);
1437  if (capturedByInit)
1438  drillIntoBlockVariable(*this, lvalue, cast<VarDecl>(D));
1439  EmitStoreThroughLValue(rvalue, lvalue, true);
1440  return;
1441  }
1442  switch (getEvaluationKind(type)) {
1443  case TEK_Scalar:
1444  EmitScalarInit(init, D, lvalue, capturedByInit);
1445  return;
1446  case TEK_Complex: {
1447  ComplexPairTy complex = EmitComplexExpr(init);
1448  if (capturedByInit)
1449  drillIntoBlockVariable(*this, lvalue, cast<VarDecl>(D));
1450  EmitStoreOfComplex(complex, lvalue, /*init*/ true);
1451  return;
1452  }
1453  case TEK_Aggregate:
1454  if (type->isAtomicType()) {
1455  EmitAtomicInit(const_cast<Expr*>(init), lvalue);
1456  } else {
1458  if (isa<VarDecl>(D))
1459  Overlap = AggValueSlot::DoesNotOverlap;
1460  else if (auto *FD = dyn_cast<FieldDecl>(D))
1461  Overlap = overlapForFieldInit(FD);
1462  // TODO: how can we delay here if D is captured by its initializer?
1463  EmitAggExpr(init, AggValueSlot::forLValue(lvalue,
1467  Overlap));
1468  }
1469  return;
1470  }
1471  llvm_unreachable("bad evaluation kind");
1472 }
1473 
1474 /// Enter a destroy cleanup for the given local variable.
1476  const CodeGenFunction::AutoVarEmission &emission,
1477  QualType::DestructionKind dtorKind) {
1478  assert(dtorKind != QualType::DK_none);
1479 
1480  // Note that for __block variables, we want to destroy the
1481  // original stack object, not the possibly forwarded object.
1482  Address addr = emission.getObjectAddress(*this);
1483 
1484  const VarDecl *var = emission.Variable;
1485  QualType type = var->getType();
1486 
1487  CleanupKind cleanupKind = NormalAndEHCleanup;
1488  CodeGenFunction::Destroyer *destroyer = nullptr;
1489 
1490  switch (dtorKind) {
1491  case QualType::DK_none:
1492  llvm_unreachable("no cleanup for trivially-destructible variable");
1493 
1495  // If there's an NRVO flag on the emission, we need a different
1496  // cleanup.
1497  if (emission.NRVOFlag) {
1498  assert(!type->isArrayType());
1500  EHStack.pushCleanup<DestroyNRVOVariableCXX>(cleanupKind, addr, dtor,
1501  emission.NRVOFlag);
1502  return;
1503  }
1504  break;
1505 
1507  // Suppress cleanups for pseudo-strong variables.
1508  if (var->isARCPseudoStrong()) return;
1509 
1510  // Otherwise, consider whether to use an EH cleanup or not.
1511  cleanupKind = getARCCleanupKind();
1512 
1513  // Use the imprecise destroyer by default.
1514  if (!var->hasAttr<ObjCPreciseLifetimeAttr>())
1516  break;
1517 
1519  break;
1520 
1523  if (emission.NRVOFlag) {
1524  assert(!type->isArrayType());
1525  EHStack.pushCleanup<DestroyNRVOVariableC>(cleanupKind, addr,
1526  emission.NRVOFlag, type);
1527  return;
1528  }
1529  break;
1530  }
1531 
1532  // If we haven't chosen a more specific destroyer, use the default.
1533  if (!destroyer) destroyer = getDestroyer(dtorKind);
1534 
1535  // Use an EH cleanup in array destructors iff the destructor itself
1536  // is being pushed as an EH cleanup.
1537  bool useEHCleanup = (cleanupKind & EHCleanup);
1538  EHStack.pushCleanup<DestroyObject>(cleanupKind, addr, type, destroyer,
1539  useEHCleanup);
1540 }
1541 
1543  assert(emission.Variable && "emission was not valid!");
1544 
1545  // If this was emitted as a global constant, we're done.
1546  if (emission.wasEmittedAsGlobal()) return;
1547 
1548  // If we don't have an insertion point, we're done. Sema prevents
1549  // us from jumping into any of these scopes anyway.
1550  if (!HaveInsertPoint()) return;
1551 
1552  const VarDecl &D = *emission.Variable;
1553 
1554  // Check the type for a cleanup.
1555  if (QualType::DestructionKind dtorKind = D.getType().isDestructedType())
1556  emitAutoVarTypeCleanup(emission, dtorKind);
1557 
1558  // In GC mode, honor objc_precise_lifetime.
1559  if (getLangOpts().getGC() != LangOptions::NonGC &&
1560  D.hasAttr<ObjCPreciseLifetimeAttr>()) {
1561  EHStack.pushCleanup<ExtendGCLifetime>(NormalCleanup, &D);
1562  }
1563 
1564  // Handle the cleanup attribute.
1565  if (const CleanupAttr *CA = D.getAttr<CleanupAttr>()) {
1566  const FunctionDecl *FD = CA->getFunctionDecl();
1567 
1568  llvm::Constant *F = CGM.GetAddrOfFunction(FD);
1569  assert(F && "Could not find function!");
1570 
1572  EHStack.pushCleanup<CallCleanupFunction>(NormalAndEHCleanup, F, &Info, &D);
1573  }
1574 
1575  // If this is a block variable, call _Block_object_destroy
1576  // (on the unforwarded address).
1577  if (emission.IsByRef)
1578  enterByrefCleanup(emission);
1579 }
1580 
1583  switch (kind) {
1584  case QualType::DK_none: llvm_unreachable("no destroyer for trivial dtor");
1586  return destroyCXXObject;
1588  return destroyARCStrongPrecise;
1590  return destroyARCWeak;
1592  return destroyNonTrivialCStruct;
1593  }
1594  llvm_unreachable("Unknown DestructionKind");
1595 }
1596 
1597 /// pushEHDestroy - Push the standard destructor for the given type as
1598 /// an EH-only cleanup.
1600  Address addr, QualType type) {
1601  assert(dtorKind && "cannot push destructor for trivial type");
1602  assert(needsEHCleanup(dtorKind));
1603 
1604  pushDestroy(EHCleanup, addr, type, getDestroyer(dtorKind), true);
1605 }
1606 
1607 /// pushDestroy - Push the standard destructor for the given type as
1608 /// at least a normal cleanup.
1610  Address addr, QualType type) {
1611  assert(dtorKind && "cannot push destructor for trivial type");
1612 
1613  CleanupKind cleanupKind = getCleanupKind(dtorKind);
1614  pushDestroy(cleanupKind, addr, type, getDestroyer(dtorKind),
1615  cleanupKind & EHCleanup);
1616 }
1617 
1619  QualType type, Destroyer *destroyer,
1620  bool useEHCleanupForArray) {
1621  pushFullExprCleanup<DestroyObject>(cleanupKind, addr, type,
1622  destroyer, useEHCleanupForArray);
1623 }
1624 
1626  EHStack.pushCleanup<CallStackRestore>(Kind, SPMem);
1627 }
1628 
1630  CleanupKind cleanupKind, Address addr, QualType type,
1631  Destroyer *destroyer, bool useEHCleanupForArray) {
1632  assert(!isInConditionalBranch() &&
1633  "performing lifetime extension from within conditional");
1634 
1635  // Push an EH-only cleanup for the object now.
1636  // FIXME: When popping normal cleanups, we need to keep this EH cleanup
1637  // around in case a temporary's destructor throws an exception.
1638  if (cleanupKind & EHCleanup)
1639  EHStack.pushCleanup<DestroyObject>(
1640  static_cast<CleanupKind>(cleanupKind & ~NormalCleanup), addr, type,
1641  destroyer, useEHCleanupForArray);
1642 
1643  // Remember that we need to push a full cleanup for the object at the
1644  // end of the full-expression.
1645  pushCleanupAfterFullExpr<DestroyObject>(
1646  cleanupKind, addr, type, destroyer, useEHCleanupForArray);
1647 }
1648 
1649 /// emitDestroy - Immediately perform the destruction of the given
1650 /// object.
1651 ///
1652 /// \param addr - the address of the object; a type*
1653 /// \param type - the type of the object; if an array type, all
1654 /// objects are destroyed in reverse order
1655 /// \param destroyer - the function to call to destroy individual
1656 /// elements
1657 /// \param useEHCleanupForArray - whether an EH cleanup should be
1658 /// used when destroying array elements, in case one of the
1659 /// destructions throws an exception
1661  Destroyer *destroyer,
1662  bool useEHCleanupForArray) {
1663  const ArrayType *arrayType = getContext().getAsArrayType(type);
1664  if (!arrayType)
1665  return destroyer(*this, addr, type);
1666 
1667  llvm::Value *length = emitArrayLength(arrayType, type, addr);
1668 
1669  CharUnits elementAlign =
1670  addr.getAlignment()
1671  .alignmentOfArrayElement(getContext().getTypeSizeInChars(type));
1672 
1673  // Normally we have to check whether the array is zero-length.
1674  bool checkZeroLength = true;
1675 
1676  // But if the array length is constant, we can suppress that.
1677  if (llvm::ConstantInt *constLength = dyn_cast<llvm::ConstantInt>(length)) {
1678  // ...and if it's constant zero, we can just skip the entire thing.
1679  if (constLength->isZero()) return;
1680  checkZeroLength = false;
1681  }
1682 
1683  llvm::Value *begin = addr.getPointer();
1684  llvm::Value *end = Builder.CreateInBoundsGEP(begin, length);
1685  emitArrayDestroy(begin, end, type, elementAlign, destroyer,
1686  checkZeroLength, useEHCleanupForArray);
1687 }
1688 
1689 /// emitArrayDestroy - Destroys all the elements of the given array,
1690 /// beginning from last to first. The array cannot be zero-length.
1691 ///
1692 /// \param begin - a type* denoting the first element of the array
1693 /// \param end - a type* denoting one past the end of the array
1694 /// \param elementType - the element type of the array
1695 /// \param destroyer - the function to call to destroy elements
1696 /// \param useEHCleanup - whether to push an EH cleanup to destroy
1697 /// the remaining elements in case the destruction of a single
1698 /// element throws
1700  llvm::Value *end,
1701  QualType elementType,
1702  CharUnits elementAlign,
1703  Destroyer *destroyer,
1704  bool checkZeroLength,
1705  bool useEHCleanup) {
1706  assert(!elementType->isArrayType());
1707 
1708  // The basic structure here is a do-while loop, because we don't
1709  // need to check for the zero-element case.
1710  llvm::BasicBlock *bodyBB = createBasicBlock("arraydestroy.body");
1711  llvm::BasicBlock *doneBB = createBasicBlock("arraydestroy.done");
1712 
1713  if (checkZeroLength) {
1714  llvm::Value *isEmpty = Builder.CreateICmpEQ(begin, end,
1715  "arraydestroy.isempty");
1716  Builder.CreateCondBr(isEmpty, doneBB, bodyBB);
1717  }
1718 
1719  // Enter the loop body, making that address the current address.
1720  llvm::BasicBlock *entryBB = Builder.GetInsertBlock();
1721  EmitBlock(bodyBB);
1722  llvm::PHINode *elementPast =
1723  Builder.CreatePHI(begin->getType(), 2, "arraydestroy.elementPast");
1724  elementPast->addIncoming(end, entryBB);
1725 
1726  // Shift the address back by one element.
1727  llvm::Value *negativeOne = llvm::ConstantInt::get(SizeTy, -1, true);
1728  llvm::Value *element = Builder.CreateInBoundsGEP(elementPast, negativeOne,
1729  "arraydestroy.element");
1730 
1731  if (useEHCleanup)
1732  pushRegularPartialArrayCleanup(begin, element, elementType, elementAlign,
1733  destroyer);
1734 
1735  // Perform the actual destruction there.
1736  destroyer(*this, Address(element, elementAlign), elementType);
1737 
1738  if (useEHCleanup)
1739  PopCleanupBlock();
1740 
1741  // Check whether we've reached the end.
1742  llvm::Value *done = Builder.CreateICmpEQ(element, begin, "arraydestroy.done");
1743  Builder.CreateCondBr(done, doneBB, bodyBB);
1744  elementPast->addIncoming(element, Builder.GetInsertBlock());
1745 
1746  // Done.
1747  EmitBlock(doneBB);
1748 }
1749 
1750 /// Perform partial array destruction as if in an EH cleanup. Unlike
1751 /// emitArrayDestroy, the element type here may still be an array type.
1753  llvm::Value *begin, llvm::Value *end,
1754  QualType type, CharUnits elementAlign,
1755  CodeGenFunction::Destroyer *destroyer) {
1756  // If the element type is itself an array, drill down.
1757  unsigned arrayDepth = 0;
1758  while (const ArrayType *arrayType = CGF.getContext().getAsArrayType(type)) {
1759  // VLAs don't require a GEP index to walk into.
1760  if (!isa<VariableArrayType>(arrayType))
1761  arrayDepth++;
1762  type = arrayType->getElementType();
1763  }
1764 
1765  if (arrayDepth) {
1766  llvm::Value *zero = llvm::ConstantInt::get(CGF.SizeTy, 0);
1767 
1768  SmallVector<llvm::Value*,4> gepIndices(arrayDepth+1, zero);
1769  begin = CGF.Builder.CreateInBoundsGEP(begin, gepIndices, "pad.arraybegin");
1770  end = CGF.Builder.CreateInBoundsGEP(end, gepIndices, "pad.arrayend");
1771  }
1772 
1773  // Destroy the array. We don't ever need an EH cleanup because we
1774  // assume that we're in an EH cleanup ourselves, so a throwing
1775  // destructor causes an immediate terminate.
1776  CGF.emitArrayDestroy(begin, end, type, elementAlign, destroyer,
1777  /*checkZeroLength*/ true, /*useEHCleanup*/ false);
1778 }
1779 
1780 namespace {
1781  /// RegularPartialArrayDestroy - a cleanup which performs a partial
1782  /// array destroy where the end pointer is regularly determined and
1783  /// does not need to be loaded from a local.
1784  class RegularPartialArrayDestroy final : public EHScopeStack::Cleanup {
1785  llvm::Value *ArrayBegin;
1786  llvm::Value *ArrayEnd;
1787  QualType ElementType;
1789  CharUnits ElementAlign;
1790  public:
1791  RegularPartialArrayDestroy(llvm::Value *arrayBegin, llvm::Value *arrayEnd,
1792  QualType elementType, CharUnits elementAlign,
1793  CodeGenFunction::Destroyer *destroyer)
1794  : ArrayBegin(arrayBegin), ArrayEnd(arrayEnd),
1795  ElementType(elementType), Destroyer(destroyer),
1796  ElementAlign(elementAlign) {}
1797 
1798  void Emit(CodeGenFunction &CGF, Flags flags) override {
1799  emitPartialArrayDestroy(CGF, ArrayBegin, ArrayEnd,
1800  ElementType, ElementAlign, Destroyer);
1801  }
1802  };
1803 
1804  /// IrregularPartialArrayDestroy - a cleanup which performs a
1805  /// partial array destroy where the end pointer is irregularly
1806  /// determined and must be loaded from a local.
1807  class IrregularPartialArrayDestroy final : public EHScopeStack::Cleanup {
1808  llvm::Value *ArrayBegin;
1809  Address ArrayEndPointer;
1810  QualType ElementType;
1812  CharUnits ElementAlign;
1813  public:
1814  IrregularPartialArrayDestroy(llvm::Value *arrayBegin,
1815  Address arrayEndPointer,
1816  QualType elementType,
1817  CharUnits elementAlign,
1818  CodeGenFunction::Destroyer *destroyer)
1819  : ArrayBegin(arrayBegin), ArrayEndPointer(arrayEndPointer),
1820  ElementType(elementType), Destroyer(destroyer),
1821  ElementAlign(elementAlign) {}
1822 
1823  void Emit(CodeGenFunction &CGF, Flags flags) override {
1824  llvm::Value *arrayEnd = CGF.Builder.CreateLoad(ArrayEndPointer);
1825  emitPartialArrayDestroy(CGF, ArrayBegin, arrayEnd,
1826  ElementType, ElementAlign, Destroyer);
1827  }
1828  };
1829 } // end anonymous namespace
1830 
1831 /// pushIrregularPartialArrayCleanup - Push an EH cleanup to destroy
1832 /// already-constructed elements of the given array. The cleanup
1833 /// may be popped with DeactivateCleanupBlock or PopCleanupBlock.
1834 ///
1835 /// \param elementType - the immediate element type of the array;
1836 /// possibly still an array type
1838  Address arrayEndPointer,
1839  QualType elementType,
1840  CharUnits elementAlign,
1841  Destroyer *destroyer) {
1842  pushFullExprCleanup<IrregularPartialArrayDestroy>(EHCleanup,
1843  arrayBegin, arrayEndPointer,
1844  elementType, elementAlign,
1845  destroyer);
1846 }
1847 
1848 /// pushRegularPartialArrayCleanup - Push an EH cleanup to destroy
1849 /// already-constructed elements of the given array. The cleanup
1850 /// may be popped with DeactivateCleanupBlock or PopCleanupBlock.
1851 ///
1852 /// \param elementType - the immediate element type of the array;
1853 /// possibly still an array type
1855  llvm::Value *arrayEnd,
1856  QualType elementType,
1857  CharUnits elementAlign,
1858  Destroyer *destroyer) {
1859  pushFullExprCleanup<RegularPartialArrayDestroy>(EHCleanup,
1860  arrayBegin, arrayEnd,
1861  elementType, elementAlign,
1862  destroyer);
1863 }
1864 
1865 /// Lazily declare the @llvm.lifetime.start intrinsic.
1867  if (LifetimeStartFn)
1868  return LifetimeStartFn;
1869  LifetimeStartFn = llvm::Intrinsic::getDeclaration(&getModule(),
1870  llvm::Intrinsic::lifetime_start, AllocaInt8PtrTy);
1871  return LifetimeStartFn;
1872 }
1873 
1874 /// Lazily declare the @llvm.lifetime.end intrinsic.
1876  if (LifetimeEndFn)
1877  return LifetimeEndFn;
1878  LifetimeEndFn = llvm::Intrinsic::getDeclaration(&getModule(),
1879  llvm::Intrinsic::lifetime_end, AllocaInt8PtrTy);
1880  return LifetimeEndFn;
1881 }
1882 
1883 namespace {
1884  /// A cleanup to perform a release of an object at the end of a
1885  /// function. This is used to balance out the incoming +1 of a
1886  /// ns_consumed argument when we can't reasonably do that just by
1887  /// not doing the initial retain for a __block argument.
1888  struct ConsumeARCParameter final : EHScopeStack::Cleanup {
1889  ConsumeARCParameter(llvm::Value *param,
1890  ARCPreciseLifetime_t precise)
1891  : Param(param), Precise(precise) {}
1892 
1893  llvm::Value *Param;
1894  ARCPreciseLifetime_t Precise;
1895 
1896  void Emit(CodeGenFunction &CGF, Flags flags) override {
1897  CGF.EmitARCRelease(Param, Precise);
1898  }
1899  };
1900 } // end anonymous namespace
1901 
1902 /// Emit an alloca (or GlobalValue depending on target)
1903 /// for the specified parameter and set up LocalDeclMap.
1905  unsigned ArgNo) {
1906  // FIXME: Why isn't ImplicitParamDecl a ParmVarDecl?
1907  assert((isa<ParmVarDecl>(D) || isa<ImplicitParamDecl>(D)) &&
1908  "Invalid argument to EmitParmDecl");
1909 
1910  Arg.getAnyValue()->setName(D.getName());
1911 
1912  QualType Ty = D.getType();
1913 
1914  // Use better IR generation for certain implicit parameters.
1915  if (auto IPD = dyn_cast<ImplicitParamDecl>(&D)) {
1916  // The only implicit argument a block has is its literal.
1917  // This may be passed as an inalloca'ed value on Windows x86.
1918  if (BlockInfo) {
1919  llvm::Value *V = Arg.isIndirect()
1921  : Arg.getDirectValue();
1922  setBlockContextParameter(IPD, ArgNo, V);
1923  return;
1924  }
1925  }
1926 
1927  Address DeclPtr = Address::invalid();
1928  bool DoStore = false;
1929  bool IsScalar = hasScalarEvaluationKind(Ty);
1930  // If we already have a pointer to the argument, reuse the input pointer.
1931  if (Arg.isIndirect()) {
1932  DeclPtr = Arg.getIndirectAddress();
1933  // If we have a prettier pointer type at this point, bitcast to that.
1934  unsigned AS = DeclPtr.getType()->getAddressSpace();
1935  llvm::Type *IRTy = ConvertTypeForMem(Ty)->getPointerTo(AS);
1936  if (DeclPtr.getType() != IRTy)
1937  DeclPtr = Builder.CreateBitCast(DeclPtr, IRTy, D.getName());
1938  // Indirect argument is in alloca address space, which may be different
1939  // from the default address space.
1940  auto AllocaAS = CGM.getASTAllocaAddressSpace();
1941  auto *V = DeclPtr.getPointer();
1942  auto SrcLangAS = getLangOpts().OpenCL ? LangAS::opencl_private : AllocaAS;
1943  auto DestLangAS =
1945  if (SrcLangAS != DestLangAS) {
1946  assert(getContext().getTargetAddressSpace(SrcLangAS) ==
1947  CGM.getDataLayout().getAllocaAddrSpace());
1948  auto DestAS = getContext().getTargetAddressSpace(DestLangAS);
1949  auto *T = V->getType()->getPointerElementType()->getPointerTo(DestAS);
1950  DeclPtr = Address(getTargetHooks().performAddrSpaceCast(
1951  *this, V, SrcLangAS, DestLangAS, T, true),
1952  DeclPtr.getAlignment());
1953  }
1954 
1955  // Push a destructor cleanup for this parameter if the ABI requires it.
1956  // Don't push a cleanup in a thunk for a method that will also emit a
1957  // cleanup.
1958  if (!IsScalar && !CurFuncIsThunk &&
1960  if (QualType::DestructionKind DtorKind = Ty.isDestructedType()) {
1961  assert((DtorKind == QualType::DK_cxx_destructor ||
1962  DtorKind == QualType::DK_nontrivial_c_struct) &&
1963  "unexpected destructor type");
1964  pushDestroy(DtorKind, DeclPtr, Ty);
1965  }
1966  }
1967  } else {
1968  // Check if the parameter address is controlled by OpenMP runtime.
1969  Address OpenMPLocalAddr =
1970  getLangOpts().OpenMP
1971  ? CGM.getOpenMPRuntime().getAddressOfLocalVariable(*this, &D)
1972  : Address::invalid();
1973  if (getLangOpts().OpenMP && OpenMPLocalAddr.isValid()) {
1974  DeclPtr = OpenMPLocalAddr;
1975  } else {
1976  // Otherwise, create a temporary to hold the value.
1977  DeclPtr = CreateMemTemp(Ty, getContext().getDeclAlign(&D),
1978  D.getName() + ".addr");
1979  }
1980  DoStore = true;
1981  }
1982 
1983  llvm::Value *ArgVal = (DoStore ? Arg.getDirectValue() : nullptr);
1984 
1985  LValue lv = MakeAddrLValue(DeclPtr, Ty);
1986  if (IsScalar) {
1987  Qualifiers qs = Ty.getQualifiers();
1988  if (Qualifiers::ObjCLifetime lt = qs.getObjCLifetime()) {
1989  // We honor __attribute__((ns_consumed)) for types with lifetime.
1990  // For __strong, it's handled by just skipping the initial retain;
1991  // otherwise we have to balance out the initial +1 with an extra
1992  // cleanup to do the release at the end of the function.
1993  bool isConsumed = D.hasAttr<NSConsumedAttr>();
1994 
1995  // 'self' is always formally __strong, but if this is not an
1996  // init method then we don't want to retain it.
1997  if (D.isARCPseudoStrong()) {
1998  const ObjCMethodDecl *method = cast<ObjCMethodDecl>(CurCodeDecl);
1999  assert(&D == method->getSelfDecl());
2000  assert(lt == Qualifiers::OCL_Strong);
2001  assert(qs.hasConst());
2002  assert(method->getMethodFamily() != OMF_init);
2003  (void) method;
2005  }
2006 
2007  // Load objects passed indirectly.
2008  if (Arg.isIndirect() && !ArgVal)
2009  ArgVal = Builder.CreateLoad(DeclPtr);
2010 
2011  if (lt == Qualifiers::OCL_Strong) {
2012  if (!isConsumed) {
2013  if (CGM.getCodeGenOpts().OptimizationLevel == 0) {
2014  // use objc_storeStrong(&dest, value) for retaining the
2015  // object. But first, store a null into 'dest' because
2016  // objc_storeStrong attempts to release its old value.
2017  llvm::Value *Null = CGM.EmitNullConstant(D.getType());
2018  EmitStoreOfScalar(Null, lv, /* isInitialization */ true);
2019  EmitARCStoreStrongCall(lv.getAddress(), ArgVal, true);
2020  DoStore = false;
2021  }
2022  else
2023  // Don't use objc_retainBlock for block pointers, because we
2024  // don't want to Block_copy something just because we got it
2025  // as a parameter.
2026  ArgVal = EmitARCRetainNonBlock(ArgVal);
2027  }
2028  } else {
2029  // Push the cleanup for a consumed parameter.
2030  if (isConsumed) {
2031  ARCPreciseLifetime_t precise = (D.hasAttr<ObjCPreciseLifetimeAttr>()
2033  EHStack.pushCleanup<ConsumeARCParameter>(getARCCleanupKind(), ArgVal,
2034  precise);
2035  }
2036 
2037  if (lt == Qualifiers::OCL_Weak) {
2038  EmitARCInitWeak(DeclPtr, ArgVal);
2039  DoStore = false; // The weak init is a store, no need to do two.
2040  }
2041  }
2042 
2043  // Enter the cleanup scope.
2044  EmitAutoVarWithLifetime(*this, D, DeclPtr, lt);
2045  }
2046  }
2047 
2048  // Store the initial value into the alloca.
2049  if (DoStore)
2050  EmitStoreOfScalar(ArgVal, lv, /* isInitialization */ true);
2051 
2052  setAddrOfLocalVar(&D, DeclPtr);
2053 
2054  // Emit debug info for param declaration.
2055  if (CGDebugInfo *DI = getDebugInfo()) {
2056  if (CGM.getCodeGenOpts().getDebugInfo() >=
2058  DI->EmitDeclareOfArgVariable(&D, DeclPtr.getPointer(), ArgNo, Builder);
2059  }
2060  }
2061 
2062  if (D.hasAttr<AnnotateAttr>())
2063  EmitVarAnnotations(&D, DeclPtr.getPointer());
2064 
2065  // We can only check return value nullability if all arguments to the
2066  // function satisfy their nullability preconditions. This makes it necessary
2067  // to emit null checks for args in the function body itself.
2068  if (requiresReturnValueNullabilityCheck()) {
2069  auto Nullability = Ty->getNullability(getContext());
2071  SanitizerScope SanScope(this);
2072  RetValNullabilityPrecondition =
2073  Builder.CreateAnd(RetValNullabilityPrecondition,
2074  Builder.CreateIsNotNull(Arg.getAnyValue()));
2075  }
2076  }
2077 }
2078 
2080  CodeGenFunction *CGF) {
2081  if (!LangOpts.OpenMP || (!LangOpts.EmitAllDecls && !D->isUsed()))
2082  return;
2083  getOpenMPRuntime().emitUserDefinedReduction(CGF, D);
2084 }
const llvm::DataLayout & getDataLayout() const
CGOpenCLRuntime & getOpenCLRuntime()
Return a reference to the configured OpenCL runtime.
ReturnValueSlot - Contains the address where the return value of a function can be stored...
Definition: CGCall.h:361
const internal::VariadicAllOfMatcher< Type > type
Matches Types in the clang AST.
Defines the clang::ASTContext interface.
llvm::StoreInst * CreateDefaultAlignedStore(llvm::Value *Val, llvm::Value *Addr, bool IsVolatile=false)
Definition: CGBuilder.h:122
void setImplicit(bool I=true)
Definition: DeclBase.h:552
Represents a function declaration or definition.
Definition: Decl.h:1709
void EmitStaticVarDecl(const VarDecl &D, llvm::GlobalValue::LinkageTypes Linkage)
Definition: CGDecl.cpp:376
llvm::Value * EmitARCRetainAutoreleaseScalarExpr(const Expr *expr)
Definition: CGObjC.cpp:2982
Destroyer * getDestroyer(QualType::DestructionKind destructionKind)
Definition: CGDecl.cpp:1582
A (possibly-)qualified type.
Definition: Type.h:653
Allows to disable automatic handling of functions used in target regions as those marked as omp decla...
void EmitExtendGCLifetime(llvm::Value *object)
EmitExtendGCLifetime - Given a pointer to an Objective-C object, make sure it survives garbage collec...
Definition: CGObjC.cpp:3192
bool isPODType(const ASTContext &Context) const
Determine whether this is a Plain Old Data (POD) type (C++ 3.9p10).
Definition: Type.cpp:2056
bool isArrayType() const
Definition: Type.h:6070
llvm::Type * ConvertTypeForMem(QualType T)
const CodeGenOptions & getCodeGenOpts() const
void EmitVarDecl(const VarDecl &D)
EmitVarDecl - Emit a local variable declaration.
Definition: CGDecl.cpp:156
llvm::Constant * EmitCheckTypeDescriptor(QualType T)
Emit a description of a type in a format suitable for passing to a runtime sanitizer handler...
Definition: CGExpr.cpp:2641
bool HaveInsertPoint() const
HaveInsertPoint - True if an insertion point is defined.
Stmt - This represents one statement.
Definition: Stmt.h:66
llvm::Constant * tryEmitForInitializer(const VarDecl &D)
Try to emit the initiaizer of the given declaration as an abstract constant.
Defines the SourceManager interface.
static bool canEmitInitWithFewStoresAfterMemset(llvm::Constant *Init, unsigned &NumStores)
canEmitInitWithFewStoresAfterMemset - Decide whether we can emit the non-zero parts of the specified ...
Definition: CGDecl.cpp:852
bool isRecordType() const
Definition: Type.h:6094
bool hasLabelBeenSeenInCurrentScope() const
Return true if a label was seen in the current scope.
void emitAutoVarTypeCleanup(const AutoVarEmission &emission, QualType::DestructionKind dtorKind)
Enter a destroy cleanup for the given local variable.
Definition: CGDecl.cpp:1475
Decl - This represents one declaration (or definition), e.g.
Definition: DeclBase.h:86
const Decl * CurCodeDecl
CurCodeDecl - This is the inner-most code context, which includes blocks.
void EmitCheck(ArrayRef< std::pair< llvm::Value *, SanitizerMask >> Checked, SanitizerHandler Check, ArrayRef< llvm::Constant *> StaticArgs, ArrayRef< llvm::Value *> DynamicArgs)
Create a basic block that will call a handler function in a sanitizer runtime with the provided argum...
Definition: CGExpr.cpp:2853
void EmitAutoVarDecl(const VarDecl &D)
EmitAutoVarDecl - Emit an auto variable declaration.
Definition: CGDecl.cpp:954
static Destroyer destroyARCStrongPrecise
void pushLifetimeExtendedDestroy(CleanupKind kind, Address addr, QualType type, Destroyer *destroyer, bool useEHCleanupForArray)
Definition: CGDecl.cpp:1629
void EmitStoreThroughLValue(RValue Src, LValue Dst, bool isInit=false)
EmitStoreThroughLValue - Store the specified rvalue into the specified lvalue, where both are guarant...
Definition: CGExpr.cpp:1842
Represents an array type, per C99 6.7.5.2 - Array Declarators.
Definition: Type.h:2627
Represents a call to a C++ constructor.
Definition: ExprCXX.h:1239
void EmitARCCopyWeak(Address dst, Address src)
void @objc_copyWeak(i8** dest, i8** src) Disregards the current value in dest.
Definition: CGObjC.cpp:2306
constexpr XRayInstrMask Function
Definition: XRayInstr.h:39
llvm::Value * EmitARCRetainNonBlock(llvm::Value *value)
Retain the given object, with normal retain semantics.
Definition: CGObjC.cpp:1965
llvm::IntegerType * Int8Ty
i8, i16, i32, and i64
Represents a C++ constructor within a class.
Definition: DeclCXX.h:2448
bool isParamDestroyedInCallee(QualType T) const
Determine whether a type is a class that should be detructed in the callee function.
The type is a struct containing a field whose type is not PCK_Trivial.
Definition: Type.h:1100
RValue EmitCall(const CGFunctionInfo &CallInfo, const CGCallee &Callee, ReturnValueSlot ReturnValue, const CallArgList &Args, llvm::Instruction **callOrInvoke, SourceLocation Loc)
EmitCall - Generate a call of the given function, expecting the given result type, and using the given argument list which specifies both the LLVM arguments and the types they were derived from.
Definition: CGCall.cpp:3741
Represents a variable declaration or definition.
Definition: Decl.h:812
Address getObjectAddress(CodeGenFunction &CGF) const
Returns the address of the object within this declaration.
RAII object to set/unset CodeGenFunction::IsSanitizerScope.
const T * getAs() const
Member-template getAs<specific type>&#39;.
Definition: Type.h:6390
LangAS
Defines the address space values used by the address space qualifier of QualType. ...
Definition: AddressSpaces.h:26
This class gathers all debug information during compilation and is responsible for emitting to llvm g...
Definition: CGDebugInfo.h:54
ObjCMethodDecl - Represents an instance or class method declaration.
Definition: DeclObjC.h:139
void EmitVariablyModifiedType(QualType Ty)
EmitVLASize - Capture all the sizes for the VLA expressions in the given variably-modified type and s...
llvm::Value * getPointer() const
Definition: Address.h:38
llvm::Type * ConvertTypeForMem(QualType T)
ConvertTypeForMem - Convert type T into a llvm::Type.
Represents an expression – generally a full-expression – that introduces cleanups to be run at the ...
Definition: ExprCXX.h:3003
Linkage
Describes the different kinds of linkage (C++ [basic.link], C99 6.2.2) that an entity may have...
Definition: Linkage.h:24
unsigned getAddressSpace() const
Return the address space that this address resides in.
Definition: Address.h:57
The collection of all-type qualifiers we support.
Definition: Type.h:152
void add(RValue rvalue, QualType type)
Definition: CGCall.h:285
bool isARCPseudoStrong() const
Determine whether this variable is an ARC pseudo-__strong variable.
Definition: Decl.h:1354
const TargetInfo & getTarget() const
One of these records is kept for each identifier that is lexed.
TargetCXXABI getCXXABI() const
Get the C++ ABI currently in use.
Definition: TargetInfo.h:864
void emitDestroy(Address addr, QualType type, Destroyer *destroyer, bool useEHCleanupForArray)
emitDestroy - Immediately perform the destruction of the given object.
Definition: CGDecl.cpp:1660
void emitByrefStructureInit(const AutoVarEmission &emission)
Initialize the structural components of a __block variable, i.e.
Definition: CGBlocks.cpp:2417
VlaSizePair getVLAElements1D(const VariableArrayType *vla)
Return the number of elements for a single dimension for the given array type.
Address getAddress() const
Definition: CGValue.h:327
CodeGenFunction - This class organizes the per-function state that is used while generating LLVM code...
llvm::Constant * tryEmitAbstractForInitializer(const VarDecl &D)
Try to emit the initializer of the given declaration as an abstract constant.
void EmitExprAsInit(const Expr *init, const ValueDecl *D, LValue lvalue, bool capturedByInit)
EmitExprAsInit - Emits the code necessary to initialize a location in memory with the given initializ...
Definition: CGDecl.cpp:1431
RValue EmitReferenceBindingToExpr(const Expr *E)
Emits a reference binding to the passed in expression.
Definition: CGExpr.cpp:533
Qualifiers::ObjCLifetime getObjCLifetime() const
Definition: CGValue.h:266
bool isReferenceType() const
Definition: Type.h:6033
void pushEHDestroy(QualType::DestructionKind dtorKind, Address addr, QualType type)
pushEHDestroy - Push the standard destructor for the given type as an EH-only cleanup.
Definition: CGDecl.cpp:1599
Denotes a cleanup that should run when a scope is exited using exceptional control flow (a throw stat...
Definition: EHScopeStack.h:81
void reportGlobalToASan(llvm::GlobalVariable *GV, const VarDecl &D, bool IsDynInit=false)
Address getAllocatedAddress() const
Returns the raw, allocated address, which is not necessarily the address of the object itself...
CleanupKind getCleanupKind(QualType::DestructionKind kind)
IdentifierTable & Idents
Definition: ASTContext.h:537
void EmitStoreOfScalar(llvm::Value *Value, Address Addr, bool Volatile, QualType Ty, AlignmentSource Source=AlignmentSource::Type, bool isInit=false, bool isNontemporal=false)
EmitStoreOfScalar - Store a scalar value to an address, taking care to appropriately convert from the...
void setNonGC(bool Value)
Definition: CGValue.h:277
llvm::Constant * getLLVMLifetimeStartFn()
Lazily declare the .lifetime.start intrinsic.
Definition: CGDecl.cpp:1866
ObjCMethodFamily getMethodFamily() const
Determines the family of this method.
Definition: DeclObjC.cpp:940
llvm::Value * EmitARCStoreStrongCall(Address addr, llvm::Value *value, bool resultIgnored)
Store into a strong object.
Definition: CGObjC.cpp:2118
void pushRegularPartialArrayCleanup(llvm::Value *arrayBegin, llvm::Value *arrayEnd, QualType elementType, CharUnits elementAlignment, Destroyer *destroyer)
pushRegularPartialArrayCleanup - Push an EH cleanup to destroy already-constructed elements of the gi...
Definition: CGDecl.cpp:1854
static bool hasScalarEvaluationKind(QualType T)
static void drillIntoBlockVariable(CodeGenFunction &CGF, LValue &lvalue, const VarDecl *var)
Definition: CGDecl.cpp:711
Base object ctor.
Definition: ABI.h:27
void defaultInitNonTrivialCStructVar(LValue Dst)
Address CreateElementBitCast(Address Addr, llvm::Type *Ty, const llvm::Twine &Name="")
Cast the element type of the given address to a different type, preserving information like the align...
Definition: CGBuilder.h:157
CharUnits - This is an opaque type for sizes expressed in character units.
Definition: CharUnits.h:38
static bool shouldUseMemSetPlusStoresToInitialize(llvm::Constant *Init, uint64_t GlobalSize)
shouldUseMemSetPlusStoresToInitialize - Decide whether we should use memset plus some stores to initi...
Definition: CGDecl.cpp:935
void EmitOMPDeclareReduction(const OMPDeclareReductionDecl *D, CodeGenFunction *CGF=nullptr)
Emit a code for declare reduction construct.
Definition: CGDecl.cpp:2079
An x-value expression is a reference to an object with independent storage but which can be "moved"...
Definition: Specifiers.h:116
ExprValueKind getValueKind() const
getValueKind - The value kind that this expression produces.
Definition: Expr.h:405
void EmitGlobalVariable(llvm::GlobalVariable *GV, const VarDecl *Decl)
Emit information about a global variable.
CharUnits getAlignment() const
Return the alignment of this pointer.
Definition: Address.h:67
void setStaticLocalDeclAddress(const VarDecl *D, llvm::Constant *C)
child_range children()
Definition: Stmt.cpp:227
bool needsEHCleanup(QualType::DestructionKind kind)
Determines whether an EH cleanup is required to destroy a type with the given destruction kind...
const_arg_iterator arg_begin() const
llvm::Value * EmitARCUnsafeUnretainedScalarExpr(const Expr *expr)
EmitARCUnsafeUnretainedScalarExpr - Semantically equivalent to immediately releasing the resut of Emi...
Definition: CGObjC.cpp:3093
llvm::CallInst * CreateMemCpy(Address Dest, Address Src, llvm::Value *Size, bool IsVolatile=false)
Definition: CGBuilder.h:259
bool isConstexpr() const
Whether this variable is (C++11) constexpr.
Definition: Decl.h:1381
CharUnits getDeclAlign(const Decl *D, bool ForAlignof=false) const
Return a conservative estimate of the alignment of the specified decl D.
Expr * IgnoreParenCasts() LLVM_READONLY
IgnoreParenCasts - Ignore parentheses and casts.
Definition: Expr.cpp:2469
Values of this type can never be null.
Scope - A scope is a transient data structure that is used while parsing the program.
Definition: Scope.h:40
llvm::BasicBlock * createBasicBlock(const Twine &name="", llvm::Function *parent=nullptr, llvm::BasicBlock *before=nullptr)
createBasicBlock - Create an LLVM basic block.
llvm::Value * EmitARCRetainScalarExpr(const Expr *expr)
EmitARCRetainScalarExpr - Semantically equivalent to EmitARCRetainObject(e->getType(), EmitScalarExpr(e)), but making a best-effort attempt to peephole expressions that naturally produce retained objects.
Definition: CGObjC.cpp:2966
Denotes a cleanup that should run when a scope is exited using normal control flow (falling off the e...
Definition: EHScopeStack.h:85
void EmitAtomicInit(Expr *E, LValue lvalue)
Definition: CGAtomic.cpp:1982
const internal::VariadicDynCastAllOfMatcher< Stmt, CastExpr > castExpr
Matches any cast nodes of Clang&#39;s AST.
bool hasTrivialDestructor() const
Determine whether this class has a trivial destructor (C++ [class.dtor]p3)
Definition: DeclCXX.h:1453
static VarDecl * Create(ASTContext &C, DeclContext *DC, SourceLocation StartLoc, SourceLocation IdLoc, IdentifierInfo *Id, QualType T, TypeSourceInfo *TInfo, StorageClass S)
Definition: Decl.cpp:1898
static bool ContainsLabel(const Stmt *S, bool IgnoreCaseStmts=false)
ContainsLabel - Return true if the statement contains a label in it.
CXXDestructorDecl * getDestructor() const
Returns the destructor decl for this class.
Definition: DeclCXX.cpp:1655
llvm::AllocaInst * CreateTempAlloca(llvm::Type *Ty, const Twine &Name="tmp", llvm::Value *ArraySize=nullptr)
CreateTempAlloca - This creates an alloca and inserts it into the entry block if ArraySize is nullptr...
Definition: CGExpr.cpp:94
bool hasConst() const
Definition: Type.h:269
void registerVLASizeExpression(QualType Ty, llvm::Metadata *SizeExpr)
Register VLA size expression debug node with the qualified type.
Definition: CGDebugInfo.h:318
This object can be modified without requiring retains or releases.
Definition: Type.h:173
bool isTypeConstant(QualType QTy, bool ExcludeCtorDtor)
isTypeConstant - Determine whether an object of this type can be emitted as a constant.
StorageDuration getStorageDuration() const
Get the storage duration of this variable, per C++ [basic.stc].
Definition: Decl.h:1078
llvm::Value * EmitLoadOfScalar(Address Addr, bool Volatile, QualType Ty, SourceLocation Loc, AlignmentSource Source=AlignmentSource::Type, bool isNontemporal=false)
EmitLoadOfScalar - Load a scalar value from an address, taking care to appropriately convert from the...
bool hasAttr() const
Definition: DeclBase.h:535
bool isValid() const
Definition: Address.h:36
static CharUnits One()
One - Construct a CharUnits quantity of one.
Definition: CharUnits.h:58
CompoundStmt - This represents a group of statements like { stmt stmt }.
Definition: Stmt.h:609
std::pair< llvm::Value *, llvm::Value * > ComplexPairTy
AutoVarEmission EmitAutoVarAlloca(const VarDecl &var)
EmitAutoVarAlloca - Emit the alloca and debug information for a local variable.
Definition: CGDecl.cpp:1039
CXXRecordDecl * getAsCXXRecordDecl() const
Retrieves the CXXRecordDecl that this type refers to, either because the type is a RecordType or beca...
Definition: Type.cpp:1590
const CodeGen::CGBlockInfo * BlockInfo
IdentifierInfo & getOwn(StringRef Name)
Gets an IdentifierInfo for the given name without consulting external sources.
RValue - This trivial value class is used to represent the result of an expression that is evaluated...
Definition: CGValue.h:39
void setAddress(Address address)
Definition: CGValue.h:328
CleanupKind getARCCleanupKind()
Retrieves the default cleanup kind for an ARC cleanup.
StringRef getBlockMangledName(GlobalDecl GD, const BlockDecl *BD)
llvm::Constant * getNullPointer(llvm::PointerType *T, QualType QT)
Get target specific null pointer.
QuantityType getQuantity() const
getQuantity - Get the raw integer representation of this quantity.
Definition: CharUnits.h:179
AggValueSlot::Overlap_t overlapForFieldInit(const FieldDecl *FD)
Determine whether a field initialization may overlap some other object.
Address CreateDefaultAlignTempAlloca(llvm::Type *Ty, const Twine &Name="tmp")
CreateDefaultAlignedTempAlloca - This creates an alloca with the default ABI alignment of the given L...
Definition: CGExpr.cpp:107
llvm::Value * EmitARCStoreWeak(Address addr, llvm::Value *value, bool ignored)
i8* @objc_storeWeak(i8** addr, i8* value) Returns value.
Definition: CGObjC.cpp:2250
void EmitCXXGuardedInit(const VarDecl &D, llvm::GlobalVariable *DeclPtr, bool PerformInit)
Emit code in this function to perform a guarded variable initialization.
Definition: CGDeclCXX.cpp:256
llvm::DILocalVariable * EmitDeclareOfAutoVariable(const VarDecl *Decl, llvm::Value *AI, CGBuilderTy &Builder)
Emit call to llvm.dbg.declare for an automatic variable declaration.
static TypeEvaluationKind getEvaluationKind(QualType T)
getEvaluationKind - Return the TypeEvaluationKind of QualType T.
Pepresents a block literal declaration, which is like an unnamed FunctionDecl.
Definition: Decl.h:3835
Represent the declaration of a variable (in which case it is an lvalue) a function (in which case it ...
Definition: Decl.h:636
Expr - This represents one expression.
Definition: Expr.h:106
void EmitARCMoveWeak(Address dst, Address src)
void @objc_moveWeak(i8** dest, i8** src) Disregards the current value in dest.
Definition: CGObjC.cpp:2297
Emit only debug info necessary for generating line number tables (-gline-tables-only).
void EmitAutoVarInit(const AutoVarEmission &emission)
Definition: CGDecl.cpp:1302
static Address invalid()
Definition: Address.h:35
std::string Label
void AddGlobalAnnotations(const ValueDecl *D, llvm::GlobalValue *GV)
Add global annotations that are set on D, for the global GV.
bool hasLocalStorage() const
Returns true if a variable with function scope is a non-static local variable.
Definition: Decl.h:1033
Enters a new scope for capturing cleanups, all of which will be executed once the scope is exited...
const FunctionProtoType * T
static CGCallee forDirect(llvm::Constant *functionPtr, const CGCalleeInfo &abstractInfo=CGCalleeInfo())
Definition: CGCall.h:134
virtual void EmitWorkGroupLocalVarDecl(CodeGenFunction &CGF, const VarDecl &D)
Emit the IR required for a work-group-local variable declaration, and add an entry to CGF&#39;s LocalDecl...
BlockExpr - Adaptor class for mixing a BlockDecl with expressions.
Definition: Expr.h:4873
Represents a C++ destructor within a class.
Definition: DeclCXX.h:2671
const internal::VariadicAllOfMatcher< Decl > decl
Matches declarations.
bool isExceptionVariable() const
Determine whether this variable is the exception variable in a C++ catch statememt or an Objective-C ...
Definition: Decl.h:1304
VlaSizePair getVLASize(const VariableArrayType *vla)
Returns an LLVM value that corresponds to the size, in non-variably-sized elements, of a variable length array type, plus that largest non-variably-sized element type.
llvm::PointerType * getType() const
Return the type of the pointer value.
Definition: Address.h:44
ObjCLifetime getObjCLifetime() const
Definition: Type.h:341
DeclContext * getDeclContext()
Definition: DeclBase.h:425
const AstTypeMatcher< ArrayType > arrayType
Matches all kinds of arrays.
llvm::LLVMContext & getLLVMContext()
Base object dtor.
Definition: ABI.h:37
QualType getType() const
Definition: Expr.h:128
void EmitNullabilityCheck(LValue LHS, llvm::Value *RHS, SourceLocation Loc)
Given an assignment *LHS = RHS, emit a test that checks if RHS is nonnull, if LHS is marked _Nonnull...
Definition: CGDecl.cpp:717
llvm::GlobalValue::LinkageTypes getLLVMLinkageVarDefinition(const VarDecl *VD, bool IsConstant)
Returns LLVM linkage for a declarator.
Checking the value assigned to a _Nonnull pointer. Must not be null.
CharUnits alignmentOfArrayElement(CharUnits elementSize) const
Given that this is the alignment of the first element of an array, return the minimum alignment of an...
Definition: CharUnits.h:197
llvm::PointerType * AllocaInt8PtrTy
llvm::CallInst * CreateMemSet(Address Dest, llvm::Value *Value, llvm::Value *Size, bool IsVolatile=false)
Definition: CGBuilder.h:281
void emitArrayDestroy(llvm::Value *begin, llvm::Value *end, QualType elementType, CharUnits elementAlign, Destroyer *destroyer, bool checkZeroLength, bool useEHCleanup)
emitArrayDestroy - Destroys all the elements of the given array, beginning from last to first...
Definition: CGDecl.cpp:1699
const Type * getBaseElementTypeUnsafe() const
Get the base element type of this type, potentially discarding type qualifiers.
Definition: Type.h:6348
static bool hasNontrivialDestruction(QualType T)
hasNontrivialDestruction - Determine whether a type&#39;s destruction is non-trivial. ...
Definition: CGDecl.cpp:302
float __ovld __cnfn length(float p)
Return the length of vector p, i.e., sqrt(p.x2 + p.y 2 + ...)
const LangOptions & getLangOpts() const
ASTContext & getContext() const
ImplicitParamDecl * getSelfDecl() const
Definition: DeclObjC.h:444
static bool isCapturedBy(const VarDecl &var, const Expr *e)
Determines whether the given __block variable is potentially captured by the given expression...
Definition: CGDecl.cpp:1239
GlobalDecl - represents a global declaration.
Definition: GlobalDecl.h:35
The l-value was considered opaque, so the alignment was determined from a type.
void setBlockContextParameter(const ImplicitParamDecl *D, unsigned argNum, llvm::Value *ptr)
Definition: CGBlocks.cpp:1260
void enterByrefCleanup(const AutoVarEmission &emission)
Enter a cleanup to destroy a __block variable.
Definition: CGBlocks.cpp:2550
llvm::Constant * getOrCreateStaticVarDecl(const VarDecl &D, llvm::GlobalValue::LinkageTypes Linkage)
Definition: CGDecl.cpp:209
There is no lifetime qualification on this type.
Definition: Type.h:169
Address CreateBitCast(Address Addr, llvm::Type *Ty, const llvm::Twine &Name="")
Definition: CGBuilder.h:142
Assigning into this object requires the old value to be released and the new value to be retained...
Definition: Type.h:180
llvm::GlobalVariable * AddInitializerToStaticVarDecl(const VarDecl &D, llvm::GlobalVariable *GV)
AddInitializerToStaticVarDecl - Add the initializer for &#39;D&#39; to the global variable that has already b...
Definition: CGDecl.cpp:312
Kind
void pushDestroy(QualType::DestructionKind dtorKind, Address addr, QualType type)
pushDestroy - Push the standard destructor for the given type as at least a normal cleanup...
Definition: CGDecl.cpp:1609
Encodes a location in the source.
void EmitAndRegisterVariableArrayDimensions(CGDebugInfo *DI, const VarDecl &D, bool EmitDebugInfo)
Emits the alloca and debug information for the size expressions for each dimension of an array...
Definition: CGDecl.cpp:983
void EnsureInsertPoint()
EnsureInsertPoint - Ensure that an insertion point is defined so that emitted IR has a place to go...
body_range body()
Definition: Stmt.h:640
void EmitARCRelease(llvm::Value *value, ARCPreciseLifetime_t precise)
Release the given object.
Definition: CGObjC.cpp:2072
LValue EmitDeclRefLValue(const DeclRefExpr *E)
Definition: CGExpr.cpp:2375
This represents &#39;#pragma omp declare reduction ...&#39; directive.
Definition: DeclOpenMP.h:102
LangAS getAddressSpace() const
Return the address space of this type.
Definition: Type.h:5913
static std::string getStaticDeclName(CodeGenModule &CGM, const VarDecl &D)
Definition: CGDecl.cpp:186
bool isVariablyModifiedType() const
Whether this type is a variably-modified type (C99 6.7.5).
Definition: Type.h:1943
std::string getNameAsString() const
Get a human-readable name for the declaration, even if it is one of the special kinds of names (C++ c...
Definition: Decl.h:291
TypeSourceInfo * CreateTypeSourceInfo(QualType T, unsigned Size=0) const
Allocate an uninitialized TypeSourceInfo.
static void emitPartialArrayDestroy(CodeGenFunction &CGF, llvm::Value *begin, llvm::Value *end, QualType type, CharUnits elementAlign, CodeGenFunction::Destroyer *destroyer)
Perform partial array destruction as if in an EH cleanup.
Definition: CGDecl.cpp:1752
const Decl * getDecl() const
Definition: GlobalDecl.h:64
const BlockByrefInfo & getBlockByrefInfo(const VarDecl *var)
BuildByrefInfo - This routine changes a __block variable declared as T x into:
Definition: CGBlocks.cpp:2329
llvm::Value * EmitLifetimeStart(uint64_t Size, llvm::Value *Addr)
Emit a lifetime.begin marker if some criteria are satisfied.
Definition: CGDecl.cpp:963
QualType getBaseElementType(const ArrayType *VAT) const
Return the innermost element type of an array type.
static bool isAccessedBy(const VarDecl &var, const Stmt *s)
Definition: CGDecl.cpp:629
SanitizerSet SanOpts
Sanitizers enabled for this function.
This file defines OpenMP nodes for declarative directives.
const ArrayType * getAsArrayType(QualType T) const
Type Query functions.
bool isTrivialInitializer(const Expr *Init)
Determine whether the given initializer is trivial in the sense that it requires no code to be genera...
Definition: CGDecl.cpp:1288
bool isObjCObjectPointerType() const
Definition: Type.h:6118
An aligned address.
Definition: Address.h:25
DestructionKind isDestructedType() const
Returns a nonzero value if objects of this type require non-trivial work to clean up after...
Definition: Type.h:1164
static void EmitAutoVarWithLifetime(CodeGenFunction &CGF, const VarDecl &var, Address addr, Qualifiers::ObjCLifetime lifetime)
EmitAutoVarWithLifetime - Does the setup required for an automatic variable with lifetime.
Definition: CGDecl.cpp:593
bool isUsed(bool CheckUsedAttr=true) const
Whether any (re-)declaration of the entity was used, meaning that a definition is required...
Definition: DeclBase.cpp:397
Complete object dtor.
Definition: ABI.h:36
void EmitParmDecl(const VarDecl &D, ParamValue Arg, unsigned ArgNo)
EmitParmDecl - Emit a ParmVarDecl or an ImplicitParamDecl.
Definition: CGDecl.cpp:1904
Assigning into this object requires a lifetime extension.
Definition: Type.h:186
StmtExpr - This is the GNU Statement Expression extension: ({int X=4; X;}).
Definition: Expr.h:3510
static AggValueSlot forLValue(const LValue &LV, IsDestructed_t isDestructed, NeedsGCBarriers_t needsGC, IsAliased_t isAliased, Overlap_t mayOverlap, IsZeroed_t isZeroed=IsNotZeroed)
Definition: CGValue.h:530
QualType getType() const
Definition: CGValue.h:264
llvm::Constant * getLLVMLifetimeEndFn()
Lazily declare the .lifetime.end intrinsic.
Definition: CGDecl.cpp:1875
void enterFullExpression(const ExprWithCleanups *E)
void EmitDecl(const Decl &D)
EmitDecl - Emit a declaration.
Definition: CGDecl.cpp:41
const TargetCodeGenInfo & getTargetHooks() const
static Destroyer destroyARCStrongImprecise
SourceLocation getExprLoc() const LLVM_READONLY
getExprLoc - Return the preferred location for the arrow when diagnosing a problem with a generic exp...
Definition: Expr.cpp:216
llvm::Value * EmitScalarExpr(const Expr *E, bool IgnoreResultAssign=false)
EmitScalarExpr - Emit the computation of the specified expression of LLVM scalar type, returning the result.
void addUsedGlobal(llvm::GlobalValue *GV)
Add a global to a list to be added to the llvm.used metadata.
Base class for declarations which introduce a typedef-name.
Definition: Decl.h:2853
void ErrorUnsupported(const Stmt *S, const char *Type)
Print out an error that codegen doesn&#39;t support the specified stmt yet.
CGFunctionInfo - Class to encapsulate the information about a function definition.
This class organizes the cross-function state that is used while generating LLVM code.
CGOpenMPRuntime & getOpenMPRuntime()
Return a reference to the configured OpenMP runtime.
Dataflow Directional Tag Classes.
static ApplyDebugLocation CreateDefaultArtificial(CodeGenFunction &CGF, SourceLocation TemporaryLocation)
Apply TemporaryLocation if it is valid.
Definition: CGDebugInfo.h:679
void EmitCXXDestructorCall(const CXXDestructorDecl *D, CXXDtorType Type, bool ForVirtualBase, bool Delegating, Address This)
Definition: CGClass.cpp:2363
DeclContext - This is used only as base class of specific decl types that can act as declaration cont...
Definition: DeclBase.h:1256
ArrayRef< Capture > captures() const
Definition: Decl.h:3965
const CGFunctionInfo & arrangeFunctionDeclaration(const FunctionDecl *FD)
Free functions are functions that are compatible with an ordinary C function pointer type...
Definition: CGCall.cpp:419
QualType getUnderlyingType() const
Definition: Decl.h:2908
const Expr * getInit() const
Definition: Decl.h:1217
bool isInConditionalBranch() const
isInConditionalBranch - Return true if we&#39;re currently emitting one branch or the other of a conditio...
llvm::LoadInst * CreateLoad(Address Addr, const llvm::Twine &Name="")
Definition: CGBuilder.h:70
Kind getKind() const
Definition: DeclBase.h:419
Decl * getNonClosureContext()
Find the innermost non-closure ancestor of this declaration, walking up through blocks, lambdas, etc.
Definition: DeclBase.cpp:969
llvm::Constant * EmitNullConstant(QualType T)
Return the result of value-initializing the given type, i.e.
llvm::Function * getIntrinsic(unsigned IID, ArrayRef< llvm::Type *> Tys=None)
llvm::StoreInst * CreateStore(llvm::Value *Val, Address Addr, bool IsVolatile=false)
Definition: CGBuilder.h:108
llvm::Module & getModule() const
static bool tryEmitARCCopyWeakInit(CodeGenFunction &CGF, const LValue &destLV, const Expr *init)
Definition: CGDecl.cpp:661
LValue MakeAddrLValue(Address Addr, QualType T, AlignmentSource Source=AlignmentSource::Type)
void EmitAggExpr(const Expr *E, AggValueSlot AS)
EmitAggExpr - Emit the computation of the specified expression of aggregate type. ...
Definition: CGExprAgg.cpp:1623
void EmitAutoVarCleanups(const AutoVarEmission &emission)
Definition: CGDecl.cpp:1542
A helper class that allows the use of isa/cast/dyncast to detect TagType objects of structs/unions/cl...
Definition: Type.h:4054
bool isConstantSizeType() const
Return true if this is not a variable sized type, according to the rules of C99 6.7.5p3.
Definition: Type.cpp:1976
CodeGenTypes & getTypes() const
void EmitStoreOfComplex(ComplexPairTy V, LValue dest, bool isInit)
EmitStoreOfComplex - Store a complex number into the specified l-value.
bool isConstantInitializer(ASTContext &Ctx, bool ForRef, const Expr **Culprit=nullptr) const
isConstantInitializer - Returns true if this expression can be emitted to IR as a constant...
Definition: Expr.cpp:2757
T * getAttr() const
Definition: DeclBase.h:531
llvm::Type * getElementType() const
Return the type of the values stored in this address.
Definition: Address.h:52
bool isAtomicType() const
Definition: Type.h:6131
llvm::LoadInst * CreateFlagLoad(llvm::Value *Addr, const llvm::Twine &Name="")
Emit a load from an i1 flag variable.
Definition: CGBuilder.h:129
void EmitScalarInit(const Expr *init, const ValueDecl *D, LValue lvalue, bool capturedByInit)
Definition: CGDecl.cpp:738
llvm::Constant * GetAddrOfFunction(GlobalDecl GD, llvm::Type *Ty=nullptr, bool ForVTable=false, bool DontDefer=false, ForDefinition_t IsForDefinition=NotForDefinition)
Return the address of the given function.
StringRef getMangledName(GlobalDecl GD)
Internal linkage, which indicates that the entity can be referred to from within the translation unit...
Definition: Linkage.h:32
void EmitBlock(llvm::BasicBlock *BB, bool IsFinished=false)
EmitBlock - Emit the given block.
Definition: CGStmt.cpp:445
void EmitARCInitWeak(Address addr, llvm::Value *value)
i8* @objc_initWeak(i8** addr, i8* value) Returns value.
Definition: CGObjC.cpp:2262
Optional< NullabilityKind > getNullability(const ASTContext &context) const
Determine the nullability of the given type.
Definition: Type.cpp:3625
static Destroyer destroyNonTrivialCStruct
bool IsBypassed(const VarDecl *D) const
Returns true if the variable declaration was by bypassed by any goto or switch statement.
ARCPreciseLifetime_t
Does an ARC strong l-value have precise lifetime?
Definition: CGValue.h:120
ComplexPairTy EmitComplexExpr(const Expr *E, bool IgnoreReal=false, bool IgnoreImag=false)
EmitComplexExpr - Emit the computation of the specified expression of complex type, returning the result.
A use of a default initializer in a constructor or in aggregate initialization.
Definition: ExprCXX.h:1113
static llvm::Constant * EmitNullConstant(CodeGenModule &CGM, const RecordDecl *record, bool asCompleteObject)
Reading or writing from this object requires a barrier call.
Definition: Type.h:183
llvm::DenseMap< const VarDecl *, llvm::Value * > NRVOFlags
A mapping from NRVO variables to the flags used to indicate when the NRVO has been applied to this va...
static void emitStoresForInitAfterMemset(llvm::Constant *Init, llvm::Value *Loc, bool isVolatile, CGBuilderTy &Builder)
emitStoresForInitAfterMemset - For inits that canEmitInitWithFewStoresAfterMemset returned true for...
Definition: CGDecl.cpp:891
QualType getUnqualifiedType() const
Retrieve the unqualified variant of the given type, removing as little sugar as possible.
Definition: Type.h:5877
Represents a C++ struct/union/class.
Definition: DeclCXX.h:300
bool isNRVOVariable() const
Determine whether this local variable can be used with the named return value optimization (NRVO)...
Definition: Decl.h:1322
llvm::Type * ConvertType(QualType T)
Qualifiers getQualifiers() const
Retrieve the set of qualifiers applied to this type.
Definition: Type.h:5824
LValue EmitLValue(const Expr *E)
EmitLValue - Emit code to compute a designator that specifies the location of the expression...
Definition: CGExpr.cpp:1176
Address ReturnValue
ReturnValue - The temporary alloca to hold the return value.
bool isSamplerT() const
Definition: Type.h:6175
void pushStackRestore(CleanupKind kind, Address SPMem)
Definition: CGDecl.cpp:1625
QualType getPointerType(QualType T) const
Return the uniqued reference to the type for a pointer to the specified type.
unsigned kind
All of the diagnostics that can be emitted by the frontend.
Definition: DiagnosticIDs.h:61
bool hasExternalStorage() const
Returns true if a variable has extern or private_extern storage.
Definition: Decl.h:1066
bool has(SanitizerMask K) const
Check if a certain (single) sanitizer is enabled.
Definition: Sanitizers.h:52
Defines the clang::TargetInfo interface.
void finalize(llvm::GlobalVariable *global)
bool isMicrosoft() const
Is this ABI an MSVC-compatible ABI?
Definition: TargetCXXABI.h:154
StringRef getName() const
Get the name of identifier for this declaration as a StringRef.
Definition: Decl.h:275
void setLocation(SourceLocation Loc)
Update the current source location.
A reference to a declared variable, function, enum, etc.
Definition: Expr.h:965
static RValue get(llvm::Value *V)
Definition: CGValue.h:86
void EmitLifetimeEnd(llvm::Value *Size, llvm::Value *Addr)
Definition: CGDecl.cpp:976
llvm::Constant * EmitCheckSourceLocation(SourceLocation Loc)
Emit a description of a source location in a format suitable for passing to a runtime sanitizer handl...
Definition: CGExpr.cpp:2722
bool isLocalVarDecl() const
Returns true for local variable declarations other than parameters.
Definition: Decl.h:1102
QualType getType() const
Definition: Decl.h:647
An l-value expression is a reference to an object with independent storage.
Definition: Specifiers.h:111
LValue - This represents an lvalue references.
Definition: CGValue.h:167
Information for lazily generating a cleanup.
Definition: EHScopeStack.h:147
void EmitVarAnnotations(const VarDecl *D, llvm::Value *V)
Emit local annotations for the local variable V, declared by D.
Automatic storage duration (most local variables).
Definition: Specifiers.h:275
SanitizerMetadata * getSanitizerMetadata()
bool isConstant(const ASTContext &Ctx) const
Definition: Type.h:788
bool CurFuncIsThunk
In C++, whether we are code generating a thunk.
const LangOptions & getLangOpts() const
unsigned getTargetAddressSpace(QualType T) const
Definition: ASTContext.h:2422
llvm::Value * emitArrayLength(const ArrayType *arrayType, QualType &baseType, Address &addr)
emitArrayLength - Compute the length of an array, even if it&#39;s a VLA, and drill down to the base elem...
CallArgList - Type for representing both the value and type of arguments in a call.
Definition: CGCall.h:260
Address CreateMemTemp(QualType T, const Twine &Name="tmp", bool CastToDefaultAddrSpace=true)
CreateMemTemp - Create a temporary memory object of the given type, with appropriate alignment...
Definition: CGExpr.cpp:127
void PopCleanupBlock(bool FallThroughIsBranchThrough=false)
PopCleanupBlock - Will pop the cleanup entry on the stack and process all branch fixups.
Definition: CGCleanup.cpp:640
llvm::Value * getPointer() const
Definition: CGValue.h:323
Address emitBlockByrefAddress(Address baseAddr, const VarDecl *V, bool followForward=true)
BuildBlockByrefAddress - Computes the location of the data in a variable which is declared as __block...
Definition: CGBlocks.cpp:2292
SourceLocation getLocation() const
Definition: DeclBase.h:416
void pushIrregularPartialArrayCleanup(llvm::Value *arrayBegin, Address arrayEndPointer, QualType elementType, CharUnits elementAlignment, Destroyer *destroyer)
pushIrregularPartialArrayCleanup - Push an EH cleanup to destroy already-constructed elements of the ...
Definition: CGDecl.cpp:1837
bool isExternallyVisible() const
Definition: Decl.h:379
QualType getIntTypeForBitwidth(unsigned DestWidth, unsigned Signed) const
getIntTypeForBitwidth - sets integer QualTy according to specified details: bitwidth, signed/unsigned.
Expr * IgnoreParens() LLVM_READONLY
IgnoreParens - Ignore parentheses.
Definition: Expr.cpp:2438
void Destroyer(CodeGenFunction &CGF, Address addr, QualType ty)
static CharUnits getDeclAlign(Expr *E, CharUnits TypeAlign, ASTContext &Context)
A helper function to get the alignment of a Decl referred to by DeclRefExpr or MemberExpr.
Qualifiers::ObjCLifetime getObjCLifetime() const
Returns lifetime attribute of this type.
Definition: Type.h:1070