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 /// Decide whether we can emit the non-zero parts of the specified initializer
850 /// with equal or fewer than NumStores scalar stores.
851 static bool canEmitInitWithFewStoresAfterBZero(llvm::Constant *Init,
852  unsigned &NumStores) {
853  // Zero and Undef never requires any extra stores.
854  if (isa<llvm::ConstantAggregateZero>(Init) ||
855  isa<llvm::ConstantPointerNull>(Init) ||
856  isa<llvm::UndefValue>(Init))
857  return true;
858  if (isa<llvm::ConstantInt>(Init) || isa<llvm::ConstantFP>(Init) ||
859  isa<llvm::ConstantVector>(Init) || isa<llvm::BlockAddress>(Init) ||
860  isa<llvm::ConstantExpr>(Init))
861  return Init->isNullValue() || NumStores--;
862 
863  // See if we can emit each element.
864  if (isa<llvm::ConstantArray>(Init) || isa<llvm::ConstantStruct>(Init)) {
865  for (unsigned i = 0, e = Init->getNumOperands(); i != e; ++i) {
866  llvm::Constant *Elt = cast<llvm::Constant>(Init->getOperand(i));
867  if (!canEmitInitWithFewStoresAfterBZero(Elt, NumStores))
868  return false;
869  }
870  return true;
871  }
872 
873  if (llvm::ConstantDataSequential *CDS =
874  dyn_cast<llvm::ConstantDataSequential>(Init)) {
875  for (unsigned i = 0, e = CDS->getNumElements(); i != e; ++i) {
876  llvm::Constant *Elt = CDS->getElementAsConstant(i);
877  if (!canEmitInitWithFewStoresAfterBZero(Elt, NumStores))
878  return false;
879  }
880  return true;
881  }
882 
883  // Anything else is hard and scary.
884  return false;
885 }
886 
887 /// For inits that canEmitInitWithFewStoresAfterBZero returned true for, emit
888 /// the scalar stores that would be required.
890  llvm::Constant *Init, Address Loc,
891  bool isVolatile, CGBuilderTy &Builder) {
892  assert(!Init->isNullValue() && !isa<llvm::UndefValue>(Init) &&
893  "called emitStoresForInitAfterBZero for zero or undef value.");
894 
895  if (isa<llvm::ConstantInt>(Init) || isa<llvm::ConstantFP>(Init) ||
896  isa<llvm::ConstantVector>(Init) || isa<llvm::BlockAddress>(Init) ||
897  isa<llvm::ConstantExpr>(Init)) {
898  Builder.CreateStore(Init, Loc, isVolatile);
899  return;
900  }
901 
902  if (llvm::ConstantDataSequential *CDS =
903  dyn_cast<llvm::ConstantDataSequential>(Init)) {
904  for (unsigned i = 0, e = CDS->getNumElements(); i != e; ++i) {
905  llvm::Constant *Elt = CDS->getElementAsConstant(i);
906 
907  // If necessary, get a pointer to the element and emit it.
908  if (!Elt->isNullValue() && !isa<llvm::UndefValue>(Elt))
910  CGM, Elt,
911  Builder.CreateConstInBoundsGEP2_32(Loc, 0, i, CGM.getDataLayout()),
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  CGM, Elt,
927  Builder.CreateConstInBoundsGEP2_32(Loc, 0, i, CGM.getDataLayout()),
928  isVolatile, Builder);
929  }
930 }
931 
932 /// Decide whether we should use bzero plus some stores to initialize a local
933 /// variable instead of using a memcpy from a constant global. It is beneficial
934 /// to use bzero if the global is all zeros, or mostly zeros and large.
935 static bool shouldUseBZeroPlusStoresToInitialize(llvm::Constant *Init,
936  uint64_t GlobalSize) {
937  // If a global is all zeros, always use a bzero.
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  canEmitInitWithFewStoresAfterBZero(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  assert(Addr->getType()->getPointerAddressSpace() ==
969  CGM.getDataLayout().getAllocaAddrSpace() &&
970  "Pointer should be in alloca address space");
971  llvm::Value *SizeV = llvm::ConstantInt::get(Int64Ty, Size);
972  Addr = Builder.CreateBitCast(Addr, AllocaInt8PtrTy);
973  llvm::CallInst *C =
974  Builder.CreateCall(CGM.getLLVMLifetimeStartFn(), {SizeV, Addr});
975  C->setDoesNotThrow();
976  return SizeV;
977 }
978 
980  assert(Addr->getType()->getPointerAddressSpace() ==
981  CGM.getDataLayout().getAllocaAddrSpace() &&
982  "Pointer should be in alloca address space");
983  Addr = Builder.CreateBitCast(Addr, AllocaInt8PtrTy);
984  llvm::CallInst *C =
985  Builder.CreateCall(CGM.getLLVMLifetimeEndFn(), {Size, Addr});
986  C->setDoesNotThrow();
987 }
988 
990  CGDebugInfo *DI, const VarDecl &D, bool EmitDebugInfo) {
991  // For each dimension stores its QualType and corresponding
992  // size-expression Value.
994 
995  // Break down the array into individual dimensions.
996  QualType Type1D = D.getType();
997  while (getContext().getAsVariableArrayType(Type1D)) {
998  auto VlaSize = getVLAElements1D(Type1D);
999  if (auto *C = dyn_cast<llvm::ConstantInt>(VlaSize.NumElts))
1000  Dimensions.emplace_back(C, Type1D.getUnqualifiedType());
1001  else {
1002  auto SizeExprAddr = CreateDefaultAlignTempAlloca(
1003  VlaSize.NumElts->getType(), "__vla_expr");
1004  Builder.CreateStore(VlaSize.NumElts, SizeExprAddr);
1005  Dimensions.emplace_back(SizeExprAddr.getPointer(),
1006  Type1D.getUnqualifiedType());
1007  }
1008  Type1D = VlaSize.Type;
1009  }
1010 
1011  if (!EmitDebugInfo)
1012  return;
1013 
1014  // Register each dimension's size-expression with a DILocalVariable,
1015  // so that it can be used by CGDebugInfo when instantiating a DISubrange
1016  // to describe this array.
1017  for (auto &VlaSize : Dimensions) {
1018  llvm::Metadata *MD;
1019  if (auto *C = dyn_cast<llvm::ConstantInt>(VlaSize.NumElts))
1020  MD = llvm::ConstantAsMetadata::get(C);
1021  else {
1022  // Create an artificial VarDecl to generate debug info for.
1023  IdentifierInfo &NameIdent = getContext().Idents.getOwn(
1024  cast<llvm::AllocaInst>(VlaSize.NumElts)->getName());
1025  auto VlaExprTy = VlaSize.NumElts->getType()->getPointerElementType();
1026  auto QT = getContext().getIntTypeForBitwidth(
1027  VlaExprTy->getScalarSizeInBits(), false);
1028  auto *ArtificialDecl = VarDecl::Create(
1029  getContext(), const_cast<DeclContext *>(D.getDeclContext()),
1030  D.getLocation(), D.getLocation(), &NameIdent, QT,
1032  ArtificialDecl->setImplicit();
1033 
1034  MD = DI->EmitDeclareOfAutoVariable(ArtificialDecl, VlaSize.NumElts,
1035  Builder);
1036  }
1037  assert(MD && "No Size expression debug node created");
1038  DI->registerVLASizeExpression(VlaSize.Type, MD);
1039  }
1040 }
1041 
1042 /// EmitAutoVarAlloca - Emit the alloca and debug information for a
1043 /// local variable. Does not emit initialization or destruction.
1046  QualType Ty = D.getType();
1047  assert(
1048  Ty.getAddressSpace() == LangAS::Default ||
1049  (Ty.getAddressSpace() == LangAS::opencl_private && getLangOpts().OpenCL));
1050 
1051  AutoVarEmission emission(D);
1052 
1053  bool isByRef = D.hasAttr<BlocksAttr>();
1054  emission.IsByRef = isByRef;
1055 
1056  CharUnits alignment = getContext().getDeclAlign(&D);
1057 
1058  // If the type is variably-modified, emit all the VLA sizes for it.
1059  if (Ty->isVariablyModifiedType())
1061 
1062  auto *DI = getDebugInfo();
1063  bool EmitDebugInfo = DI && CGM.getCodeGenOpts().getDebugInfo() >=
1065 
1066  Address address = Address::invalid();
1067  Address AllocaAddr = Address::invalid();
1068  if (Ty->isConstantSizeType()) {
1069  bool NRVO = getLangOpts().ElideConstructors &&
1070  D.isNRVOVariable();
1071 
1072  // If this value is an array or struct with a statically determinable
1073  // constant initializer, there are optimizations we can do.
1074  //
1075  // TODO: We should constant-evaluate the initializer of any variable,
1076  // as long as it is initialized by a constant expression. Currently,
1077  // isConstantInitializer produces wrong answers for structs with
1078  // reference or bitfield members, and a few other cases, and checking
1079  // for POD-ness protects us from some of these.
1080  if (D.getInit() && (Ty->isArrayType() || Ty->isRecordType()) &&
1081  (D.isConstexpr() ||
1082  ((Ty.isPODType(getContext()) ||
1084  D.getInit()->isConstantInitializer(getContext(), false)))) {
1085 
1086  // If the variable's a const type, and it's neither an NRVO
1087  // candidate nor a __block variable and has no mutable members,
1088  // emit it as a global instead.
1089  // Exception is if a variable is located in non-constant address space
1090  // in OpenCL.
1091  if ((!getLangOpts().OpenCL ||
1093  (CGM.getCodeGenOpts().MergeAllConstants && !NRVO && !isByRef &&
1094  CGM.isTypeConstant(Ty, true))) {
1096 
1097  // Signal this condition to later callbacks.
1098  emission.Addr = Address::invalid();
1099  assert(emission.wasEmittedAsGlobal());
1100  return emission;
1101  }
1102 
1103  // Otherwise, tell the initialization code that we're in this case.
1104  emission.IsConstantAggregate = true;
1105  }
1106 
1107  // A normal fixed sized variable becomes an alloca in the entry block,
1108  // unless:
1109  // - it's an NRVO variable.
1110  // - we are compiling OpenMP and it's an OpenMP local variable.
1111 
1112  Address OpenMPLocalAddr =
1113  getLangOpts().OpenMP
1114  ? CGM.getOpenMPRuntime().getAddressOfLocalVariable(*this, &D)
1115  : Address::invalid();
1116  if (getLangOpts().OpenMP && OpenMPLocalAddr.isValid()) {
1117  address = OpenMPLocalAddr;
1118  } else if (NRVO) {
1119  // The named return value optimization: allocate this variable in the
1120  // return slot, so that we can elide the copy when returning this
1121  // variable (C++0x [class.copy]p34).
1122  address = ReturnValue;
1123 
1124  if (const RecordType *RecordTy = Ty->getAs<RecordType>()) {
1125  const auto *RD = RecordTy->getDecl();
1126  const auto *CXXRD = dyn_cast<CXXRecordDecl>(RD);
1127  if ((CXXRD && !CXXRD->hasTrivialDestructor()) ||
1128  RD->isNonTrivialToPrimitiveDestroy()) {
1129  // Create a flag that is used to indicate when the NRVO was applied
1130  // to this variable. Set it to zero to indicate that NRVO was not
1131  // applied.
1132  llvm::Value *Zero = Builder.getFalse();
1133  Address NRVOFlag =
1134  CreateTempAlloca(Zero->getType(), CharUnits::One(), "nrvo");
1136  Builder.CreateStore(Zero, NRVOFlag);
1137 
1138  // Record the NRVO flag for this variable.
1139  NRVOFlags[&D] = NRVOFlag.getPointer();
1140  emission.NRVOFlag = NRVOFlag.getPointer();
1141  }
1142  }
1143  } else {
1144  CharUnits allocaAlignment;
1145  llvm::Type *allocaTy;
1146  if (isByRef) {
1147  auto &byrefInfo = getBlockByrefInfo(&D);
1148  allocaTy = byrefInfo.Type;
1149  allocaAlignment = byrefInfo.ByrefAlignment;
1150  } else {
1151  allocaTy = ConvertTypeForMem(Ty);
1152  allocaAlignment = alignment;
1153  }
1154 
1155  // Create the alloca. Note that we set the name separately from
1156  // building the instruction so that it's there even in no-asserts
1157  // builds.
1158  address = CreateTempAlloca(allocaTy, allocaAlignment, D.getName(),
1159  /*ArraySize=*/nullptr, &AllocaAddr);
1160 
1161  // Don't emit lifetime markers for MSVC catch parameters. The lifetime of
1162  // the catch parameter starts in the catchpad instruction, and we can't
1163  // insert code in those basic blocks.
1164  bool IsMSCatchParam =
1166 
1167  // Emit a lifetime intrinsic if meaningful. There's no point in doing this
1168  // if we don't have a valid insertion point (?).
1169  if (HaveInsertPoint() && !IsMSCatchParam) {
1170  // If there's a jump into the lifetime of this variable, its lifetime
1171  // gets broken up into several regions in IR, which requires more work
1172  // to handle correctly. For now, just omit the intrinsics; this is a
1173  // rare case, and it's better to just be conservatively correct.
1174  // PR28267.
1175  //
1176  // We have to do this in all language modes if there's a jump past the
1177  // declaration. We also have to do it in C if there's a jump to an
1178  // earlier point in the current block because non-VLA lifetimes begin as
1179  // soon as the containing block is entered, not when its variables
1180  // actually come into scope; suppressing the lifetime annotations
1181  // completely in this case is unnecessarily pessimistic, but again, this
1182  // is rare.
1183  if (!Bypasses.IsBypassed(&D) &&
1184  !(!getLangOpts().CPlusPlus && hasLabelBeenSeenInCurrentScope())) {
1185  uint64_t size = CGM.getDataLayout().getTypeAllocSize(allocaTy);
1186  emission.SizeForLifetimeMarkers =
1187  EmitLifetimeStart(size, AllocaAddr.getPointer());
1188  }
1189  } else {
1190  assert(!emission.useLifetimeMarkers());
1191  }
1192  }
1193  } else {
1195 
1196  if (!DidCallStackSave) {
1197  // Save the stack.
1198  Address Stack =
1199  CreateTempAlloca(Int8PtrTy, getPointerAlign(), "saved_stack");
1200 
1201  llvm::Value *F = CGM.getIntrinsic(llvm::Intrinsic::stacksave);
1202  llvm::Value *V = Builder.CreateCall(F);
1203  Builder.CreateStore(V, Stack);
1204 
1205  DidCallStackSave = true;
1206 
1207  // Push a cleanup block and restore the stack there.
1208  // FIXME: in general circumstances, this should be an EH cleanup.
1210  }
1211 
1212  auto VlaSize = getVLASize(Ty);
1213  llvm::Type *llvmTy = ConvertTypeForMem(VlaSize.Type);
1214 
1215  // Allocate memory for the array.
1216  address = CreateTempAlloca(llvmTy, alignment, "vla", VlaSize.NumElts,
1217  &AllocaAddr);
1218 
1219  // If we have debug info enabled, properly describe the VLA dimensions for
1220  // this type by registering the vla size expression for each of the
1221  // dimensions.
1222  EmitAndRegisterVariableArrayDimensions(DI, D, EmitDebugInfo);
1223  }
1224 
1225  setAddrOfLocalVar(&D, address);
1226  emission.Addr = address;
1227  emission.AllocaAddr = AllocaAddr;
1228 
1229  // Emit debug info for local var declaration.
1230  if (EmitDebugInfo && HaveInsertPoint()) {
1231  DI->setLocation(D.getLocation());
1232  (void)DI->EmitDeclareOfAutoVariable(&D, address.getPointer(), Builder);
1233  }
1234 
1235  if (D.hasAttr<AnnotateAttr>())
1236  EmitVarAnnotations(&D, address.getPointer());
1237 
1238  // Make sure we call @llvm.lifetime.end.
1239  if (emission.useLifetimeMarkers())
1241  emission.getOriginalAllocatedAddress(),
1242  emission.getSizeForLifetimeMarkers());
1243 
1244  return emission;
1245 }
1246 
1247 static bool isCapturedBy(const VarDecl &, const Expr *);
1248 
1249 /// Determines whether the given __block variable is potentially
1250 /// captured by the given statement.
1251 static bool isCapturedBy(const VarDecl &Var, const Stmt *S) {
1252  if (const Expr *E = dyn_cast<Expr>(S))
1253  return isCapturedBy(Var, E);
1254  for (const Stmt *SubStmt : S->children())
1255  if (isCapturedBy(Var, SubStmt))
1256  return true;
1257  return false;
1258 }
1259 
1260 /// Determines whether the given __block variable is potentially
1261 /// captured by the given expression.
1262 static bool isCapturedBy(const VarDecl &Var, const Expr *E) {
1263  // Skip the most common kinds of expressions that make
1264  // hierarchy-walking expensive.
1265  E = E->IgnoreParenCasts();
1266 
1267  if (const BlockExpr *BE = dyn_cast<BlockExpr>(E)) {
1268  const BlockDecl *Block = BE->getBlockDecl();
1269  for (const auto &I : Block->captures()) {
1270  if (I.getVariable() == &Var)
1271  return true;
1272  }
1273 
1274  // No need to walk into the subexpressions.
1275  return false;
1276  }
1277 
1278  if (const StmtExpr *SE = dyn_cast<StmtExpr>(E)) {
1279  const CompoundStmt *CS = SE->getSubStmt();
1280  for (const auto *BI : CS->body())
1281  if (const auto *BIE = dyn_cast<Expr>(BI)) {
1282  if (isCapturedBy(Var, BIE))
1283  return true;
1284  }
1285  else if (const auto *DS = dyn_cast<DeclStmt>(BI)) {
1286  // special case declarations
1287  for (const auto *I : DS->decls()) {
1288  if (const auto *VD = dyn_cast<VarDecl>((I))) {
1289  const Expr *Init = VD->getInit();
1290  if (Init && isCapturedBy(Var, Init))
1291  return true;
1292  }
1293  }
1294  }
1295  else
1296  // FIXME. Make safe assumption assuming arbitrary statements cause capturing.
1297  // Later, provide code to poke into statements for capture analysis.
1298  return true;
1299  return false;
1300  }
1301 
1302  for (const Stmt *SubStmt : E->children())
1303  if (isCapturedBy(Var, SubStmt))
1304  return true;
1305 
1306  return false;
1307 }
1308 
1309 /// Determine whether the given initializer is trivial in the sense
1310 /// that it requires no code to be generated.
1312  if (!Init)
1313  return true;
1314 
1315  if (const CXXConstructExpr *Construct = dyn_cast<CXXConstructExpr>(Init))
1316  if (CXXConstructorDecl *Constructor = Construct->getConstructor())
1317  if (Constructor->isTrivial() &&
1318  Constructor->isDefaultConstructor() &&
1319  !Construct->requiresZeroInitialization())
1320  return true;
1321 
1322  return false;
1323 }
1324 
1326  assert(emission.Variable && "emission was not valid!");
1327 
1328  // If this was emitted as a global constant, we're done.
1329  if (emission.wasEmittedAsGlobal()) return;
1330 
1331  const VarDecl &D = *emission.Variable;
1333  QualType type = D.getType();
1334 
1335  // If this local has an initializer, emit it now.
1336  const Expr *Init = D.getInit();
1337 
1338  // If we are at an unreachable point, we don't need to emit the initializer
1339  // unless it contains a label.
1340  if (!HaveInsertPoint()) {
1341  if (!Init || !ContainsLabel(Init)) return;
1343  }
1344 
1345  // Initialize the structure of a __block variable.
1346  if (emission.IsByRef)
1347  emitByrefStructureInit(emission);
1348 
1349  // Initialize the variable here if it doesn't have a initializer and it is a
1350  // C struct that is non-trivial to initialize or an array containing such a
1351  // struct.
1352  if (!Init &&
1353  type.isNonTrivialToPrimitiveDefaultInitialize() ==
1355  LValue Dst = MakeAddrLValue(emission.getAllocatedAddress(), type);
1356  if (emission.IsByRef)
1357  drillIntoBlockVariable(*this, Dst, &D);
1359  return;
1360  }
1361 
1362  if (isTrivialInitializer(Init))
1363  return;
1364 
1365  // Check whether this is a byref variable that's potentially
1366  // captured and moved by its own initializer. If so, we'll need to
1367  // emit the initializer first, then copy into the variable.
1368  bool capturedByInit = emission.IsByRef && isCapturedBy(D, Init);
1369 
1370  Address Loc =
1371  capturedByInit ? emission.Addr : emission.getObjectAddress(*this);
1372 
1373  llvm::Constant *constant = nullptr;
1374  if (emission.IsConstantAggregate || D.isConstexpr()) {
1375  assert(!capturedByInit && "constant init contains a capturing block?");
1376  constant = ConstantEmitter(*this).tryEmitAbstractForInitializer(D);
1377  }
1378 
1379  if (!constant) {
1380  LValue lv = MakeAddrLValue(Loc, type);
1381  lv.setNonGC(true);
1382  return EmitExprAsInit(Init, &D, lv, capturedByInit);
1383  }
1384 
1385  if (!emission.IsConstantAggregate) {
1386  // For simple scalar/complex initialization, store the value directly.
1387  LValue lv = MakeAddrLValue(Loc, type);
1388  lv.setNonGC(true);
1389  return EmitStoreThroughLValue(RValue::get(constant), lv, true);
1390  }
1391 
1392  // If this is a simple aggregate initialization, we can optimize it
1393  // in various ways.
1394  bool isVolatile = type.isVolatileQualified();
1395 
1396  llvm::Value *SizeVal =
1397  llvm::ConstantInt::get(IntPtrTy,
1398  getContext().getTypeSizeInChars(type).getQuantity());
1399 
1400  llvm::Type *BP = CGM.Int8Ty->getPointerTo(Loc.getAddressSpace());
1401  if (Loc.getType() != BP)
1402  Loc = Builder.CreateBitCast(Loc, BP);
1403 
1404  // If the initializer is all or mostly zeros, codegen with bzero then do a
1405  // few stores afterward.
1407  constant,
1408  CGM.getDataLayout().getTypeAllocSize(constant->getType()))) {
1409  Builder.CreateMemSet(Loc, llvm::ConstantInt::get(Int8Ty, 0), SizeVal,
1410  isVolatile);
1411  // Zero and undef don't require a stores.
1412  if (!constant->isNullValue() && !isa<llvm::UndefValue>(constant)) {
1413  Loc = Builder.CreateBitCast(Loc,
1414  constant->getType()->getPointerTo(Loc.getAddressSpace()));
1415  emitStoresForInitAfterBZero(CGM, constant, Loc, isVolatile, Builder);
1416  }
1417  } else {
1418  // Otherwise, create a temporary global with the initializer then
1419  // memcpy from the global to the alloca.
1420  std::string Name = getStaticDeclName(CGM, D);
1421  unsigned AS = CGM.getContext().getTargetAddressSpace(
1423  BP = llvm::PointerType::getInt8PtrTy(getLLVMContext(), AS);
1424 
1425  llvm::GlobalVariable *GV =
1426  new llvm::GlobalVariable(CGM.getModule(), constant->getType(), true,
1427  llvm::GlobalValue::PrivateLinkage,
1428  constant, Name, nullptr,
1429  llvm::GlobalValue::NotThreadLocal, AS);
1430  GV->setAlignment(Loc.getAlignment().getQuantity());
1431  GV->setUnnamedAddr(llvm::GlobalValue::UnnamedAddr::Global);
1432 
1433  Address SrcPtr = Address(GV, Loc.getAlignment());
1434  if (SrcPtr.getType() != BP)
1435  SrcPtr = Builder.CreateBitCast(SrcPtr, BP);
1436 
1437  Builder.CreateMemCpy(Loc, SrcPtr, SizeVal, isVolatile);
1438  }
1439 }
1440 
1441 /// Emit an expression as an initializer for an object (variable, field, etc.)
1442 /// at the given location. The expression is not necessarily the normal
1443 /// initializer for the object, and the address is not necessarily
1444 /// its normal location.
1445 ///
1446 /// \param init the initializing expression
1447 /// \param D the object to act as if we're initializing
1448 /// \param loc the address to initialize; its type is a pointer
1449 /// to the LLVM mapping of the object's type
1450 /// \param alignment the alignment of the address
1451 /// \param capturedByInit true if \p D is a __block variable
1452 /// whose address is potentially changed by the initializer
1454  LValue lvalue, bool capturedByInit) {
1455  QualType type = D->getType();
1456 
1457  if (type->isReferenceType()) {
1458  RValue rvalue = EmitReferenceBindingToExpr(init);
1459  if (capturedByInit)
1460  drillIntoBlockVariable(*this, lvalue, cast<VarDecl>(D));
1461  EmitStoreThroughLValue(rvalue, lvalue, true);
1462  return;
1463  }
1464  switch (getEvaluationKind(type)) {
1465  case TEK_Scalar:
1466  EmitScalarInit(init, D, lvalue, capturedByInit);
1467  return;
1468  case TEK_Complex: {
1469  ComplexPairTy complex = EmitComplexExpr(init);
1470  if (capturedByInit)
1471  drillIntoBlockVariable(*this, lvalue, cast<VarDecl>(D));
1472  EmitStoreOfComplex(complex, lvalue, /*init*/ true);
1473  return;
1474  }
1475  case TEK_Aggregate:
1476  if (type->isAtomicType()) {
1477  EmitAtomicInit(const_cast<Expr*>(init), lvalue);
1478  } else {
1480  if (isa<VarDecl>(D))
1481  Overlap = AggValueSlot::DoesNotOverlap;
1482  else if (auto *FD = dyn_cast<FieldDecl>(D))
1483  Overlap = overlapForFieldInit(FD);
1484  // TODO: how can we delay here if D is captured by its initializer?
1485  EmitAggExpr(init, AggValueSlot::forLValue(lvalue,
1489  Overlap));
1490  }
1491  return;
1492  }
1493  llvm_unreachable("bad evaluation kind");
1494 }
1495 
1496 /// Enter a destroy cleanup for the given local variable.
1498  const CodeGenFunction::AutoVarEmission &emission,
1499  QualType::DestructionKind dtorKind) {
1500  assert(dtorKind != QualType::DK_none);
1501 
1502  // Note that for __block variables, we want to destroy the
1503  // original stack object, not the possibly forwarded object.
1504  Address addr = emission.getObjectAddress(*this);
1505 
1506  const VarDecl *var = emission.Variable;
1507  QualType type = var->getType();
1508 
1509  CleanupKind cleanupKind = NormalAndEHCleanup;
1510  CodeGenFunction::Destroyer *destroyer = nullptr;
1511 
1512  switch (dtorKind) {
1513  case QualType::DK_none:
1514  llvm_unreachable("no cleanup for trivially-destructible variable");
1515 
1517  // If there's an NRVO flag on the emission, we need a different
1518  // cleanup.
1519  if (emission.NRVOFlag) {
1520  assert(!type->isArrayType());
1522  EHStack.pushCleanup<DestroyNRVOVariableCXX>(cleanupKind, addr, dtor,
1523  emission.NRVOFlag);
1524  return;
1525  }
1526  break;
1527 
1529  // Suppress cleanups for pseudo-strong variables.
1530  if (var->isARCPseudoStrong()) return;
1531 
1532  // Otherwise, consider whether to use an EH cleanup or not.
1533  cleanupKind = getARCCleanupKind();
1534 
1535  // Use the imprecise destroyer by default.
1536  if (!var->hasAttr<ObjCPreciseLifetimeAttr>())
1538  break;
1539 
1541  break;
1542 
1545  if (emission.NRVOFlag) {
1546  assert(!type->isArrayType());
1547  EHStack.pushCleanup<DestroyNRVOVariableC>(cleanupKind, addr,
1548  emission.NRVOFlag, type);
1549  return;
1550  }
1551  break;
1552  }
1553 
1554  // If we haven't chosen a more specific destroyer, use the default.
1555  if (!destroyer) destroyer = getDestroyer(dtorKind);
1556 
1557  // Use an EH cleanup in array destructors iff the destructor itself
1558  // is being pushed as an EH cleanup.
1559  bool useEHCleanup = (cleanupKind & EHCleanup);
1560  EHStack.pushCleanup<DestroyObject>(cleanupKind, addr, type, destroyer,
1561  useEHCleanup);
1562 }
1563 
1565  assert(emission.Variable && "emission was not valid!");
1566 
1567  // If this was emitted as a global constant, we're done.
1568  if (emission.wasEmittedAsGlobal()) return;
1569 
1570  // If we don't have an insertion point, we're done. Sema prevents
1571  // us from jumping into any of these scopes anyway.
1572  if (!HaveInsertPoint()) return;
1573 
1574  const VarDecl &D = *emission.Variable;
1575 
1576  // Check the type for a cleanup.
1577  if (QualType::DestructionKind dtorKind = D.getType().isDestructedType())
1578  emitAutoVarTypeCleanup(emission, dtorKind);
1579 
1580  // In GC mode, honor objc_precise_lifetime.
1581  if (getLangOpts().getGC() != LangOptions::NonGC &&
1582  D.hasAttr<ObjCPreciseLifetimeAttr>()) {
1583  EHStack.pushCleanup<ExtendGCLifetime>(NormalCleanup, &D);
1584  }
1585 
1586  // Handle the cleanup attribute.
1587  if (const CleanupAttr *CA = D.getAttr<CleanupAttr>()) {
1588  const FunctionDecl *FD = CA->getFunctionDecl();
1589 
1590  llvm::Constant *F = CGM.GetAddrOfFunction(FD);
1591  assert(F && "Could not find function!");
1592 
1594  EHStack.pushCleanup<CallCleanupFunction>(NormalAndEHCleanup, F, &Info, &D);
1595  }
1596 
1597  // If this is a block variable, call _Block_object_destroy
1598  // (on the unforwarded address).
1599  if (emission.IsByRef)
1600  enterByrefCleanup(emission);
1601 }
1602 
1605  switch (kind) {
1606  case QualType::DK_none: llvm_unreachable("no destroyer for trivial dtor");
1608  return destroyCXXObject;
1610  return destroyARCStrongPrecise;
1612  return destroyARCWeak;
1614  return destroyNonTrivialCStruct;
1615  }
1616  llvm_unreachable("Unknown DestructionKind");
1617 }
1618 
1619 /// pushEHDestroy - Push the standard destructor for the given type as
1620 /// an EH-only cleanup.
1622  Address addr, QualType type) {
1623  assert(dtorKind && "cannot push destructor for trivial type");
1624  assert(needsEHCleanup(dtorKind));
1625 
1626  pushDestroy(EHCleanup, addr, type, getDestroyer(dtorKind), true);
1627 }
1628 
1629 /// pushDestroy - Push the standard destructor for the given type as
1630 /// at least a normal cleanup.
1632  Address addr, QualType type) {
1633  assert(dtorKind && "cannot push destructor for trivial type");
1634 
1635  CleanupKind cleanupKind = getCleanupKind(dtorKind);
1636  pushDestroy(cleanupKind, addr, type, getDestroyer(dtorKind),
1637  cleanupKind & EHCleanup);
1638 }
1639 
1641  QualType type, Destroyer *destroyer,
1642  bool useEHCleanupForArray) {
1643  pushFullExprCleanup<DestroyObject>(cleanupKind, addr, type,
1644  destroyer, useEHCleanupForArray);
1645 }
1646 
1648  EHStack.pushCleanup<CallStackRestore>(Kind, SPMem);
1649 }
1650 
1652  CleanupKind cleanupKind, Address addr, QualType type,
1653  Destroyer *destroyer, bool useEHCleanupForArray) {
1654  assert(!isInConditionalBranch() &&
1655  "performing lifetime extension from within conditional");
1656 
1657  // Push an EH-only cleanup for the object now.
1658  // FIXME: When popping normal cleanups, we need to keep this EH cleanup
1659  // around in case a temporary's destructor throws an exception.
1660  if (cleanupKind & EHCleanup)
1661  EHStack.pushCleanup<DestroyObject>(
1662  static_cast<CleanupKind>(cleanupKind & ~NormalCleanup), addr, type,
1663  destroyer, useEHCleanupForArray);
1664 
1665  // Remember that we need to push a full cleanup for the object at the
1666  // end of the full-expression.
1667  pushCleanupAfterFullExpr<DestroyObject>(
1668  cleanupKind, addr, type, destroyer, useEHCleanupForArray);
1669 }
1670 
1671 /// emitDestroy - Immediately perform the destruction of the given
1672 /// object.
1673 ///
1674 /// \param addr - the address of the object; a type*
1675 /// \param type - the type of the object; if an array type, all
1676 /// objects are destroyed in reverse order
1677 /// \param destroyer - the function to call to destroy individual
1678 /// elements
1679 /// \param useEHCleanupForArray - whether an EH cleanup should be
1680 /// used when destroying array elements, in case one of the
1681 /// destructions throws an exception
1683  Destroyer *destroyer,
1684  bool useEHCleanupForArray) {
1685  const ArrayType *arrayType = getContext().getAsArrayType(type);
1686  if (!arrayType)
1687  return destroyer(*this, addr, type);
1688 
1689  llvm::Value *length = emitArrayLength(arrayType, type, addr);
1690 
1691  CharUnits elementAlign =
1692  addr.getAlignment()
1693  .alignmentOfArrayElement(getContext().getTypeSizeInChars(type));
1694 
1695  // Normally we have to check whether the array is zero-length.
1696  bool checkZeroLength = true;
1697 
1698  // But if the array length is constant, we can suppress that.
1699  if (llvm::ConstantInt *constLength = dyn_cast<llvm::ConstantInt>(length)) {
1700  // ...and if it's constant zero, we can just skip the entire thing.
1701  if (constLength->isZero()) return;
1702  checkZeroLength = false;
1703  }
1704 
1705  llvm::Value *begin = addr.getPointer();
1706  llvm::Value *end = Builder.CreateInBoundsGEP(begin, length);
1707  emitArrayDestroy(begin, end, type, elementAlign, destroyer,
1708  checkZeroLength, useEHCleanupForArray);
1709 }
1710 
1711 /// emitArrayDestroy - Destroys all the elements of the given array,
1712 /// beginning from last to first. The array cannot be zero-length.
1713 ///
1714 /// \param begin - a type* denoting the first element of the array
1715 /// \param end - a type* denoting one past the end of the array
1716 /// \param elementType - the element type of the array
1717 /// \param destroyer - the function to call to destroy elements
1718 /// \param useEHCleanup - whether to push an EH cleanup to destroy
1719 /// the remaining elements in case the destruction of a single
1720 /// element throws
1722  llvm::Value *end,
1723  QualType elementType,
1724  CharUnits elementAlign,
1725  Destroyer *destroyer,
1726  bool checkZeroLength,
1727  bool useEHCleanup) {
1728  assert(!elementType->isArrayType());
1729 
1730  // The basic structure here is a do-while loop, because we don't
1731  // need to check for the zero-element case.
1732  llvm::BasicBlock *bodyBB = createBasicBlock("arraydestroy.body");
1733  llvm::BasicBlock *doneBB = createBasicBlock("arraydestroy.done");
1734 
1735  if (checkZeroLength) {
1736  llvm::Value *isEmpty = Builder.CreateICmpEQ(begin, end,
1737  "arraydestroy.isempty");
1738  Builder.CreateCondBr(isEmpty, doneBB, bodyBB);
1739  }
1740 
1741  // Enter the loop body, making that address the current address.
1742  llvm::BasicBlock *entryBB = Builder.GetInsertBlock();
1743  EmitBlock(bodyBB);
1744  llvm::PHINode *elementPast =
1745  Builder.CreatePHI(begin->getType(), 2, "arraydestroy.elementPast");
1746  elementPast->addIncoming(end, entryBB);
1747 
1748  // Shift the address back by one element.
1749  llvm::Value *negativeOne = llvm::ConstantInt::get(SizeTy, -1, true);
1750  llvm::Value *element = Builder.CreateInBoundsGEP(elementPast, negativeOne,
1751  "arraydestroy.element");
1752 
1753  if (useEHCleanup)
1754  pushRegularPartialArrayCleanup(begin, element, elementType, elementAlign,
1755  destroyer);
1756 
1757  // Perform the actual destruction there.
1758  destroyer(*this, Address(element, elementAlign), elementType);
1759 
1760  if (useEHCleanup)
1761  PopCleanupBlock();
1762 
1763  // Check whether we've reached the end.
1764  llvm::Value *done = Builder.CreateICmpEQ(element, begin, "arraydestroy.done");
1765  Builder.CreateCondBr(done, doneBB, bodyBB);
1766  elementPast->addIncoming(element, Builder.GetInsertBlock());
1767 
1768  // Done.
1769  EmitBlock(doneBB);
1770 }
1771 
1772 /// Perform partial array destruction as if in an EH cleanup. Unlike
1773 /// emitArrayDestroy, the element type here may still be an array type.
1775  llvm::Value *begin, llvm::Value *end,
1776  QualType type, CharUnits elementAlign,
1777  CodeGenFunction::Destroyer *destroyer) {
1778  // If the element type is itself an array, drill down.
1779  unsigned arrayDepth = 0;
1780  while (const ArrayType *arrayType = CGF.getContext().getAsArrayType(type)) {
1781  // VLAs don't require a GEP index to walk into.
1782  if (!isa<VariableArrayType>(arrayType))
1783  arrayDepth++;
1784  type = arrayType->getElementType();
1785  }
1786 
1787  if (arrayDepth) {
1788  llvm::Value *zero = llvm::ConstantInt::get(CGF.SizeTy, 0);
1789 
1790  SmallVector<llvm::Value*,4> gepIndices(arrayDepth+1, zero);
1791  begin = CGF.Builder.CreateInBoundsGEP(begin, gepIndices, "pad.arraybegin");
1792  end = CGF.Builder.CreateInBoundsGEP(end, gepIndices, "pad.arrayend");
1793  }
1794 
1795  // Destroy the array. We don't ever need an EH cleanup because we
1796  // assume that we're in an EH cleanup ourselves, so a throwing
1797  // destructor causes an immediate terminate.
1798  CGF.emitArrayDestroy(begin, end, type, elementAlign, destroyer,
1799  /*checkZeroLength*/ true, /*useEHCleanup*/ false);
1800 }
1801 
1802 namespace {
1803  /// RegularPartialArrayDestroy - a cleanup which performs a partial
1804  /// array destroy where the end pointer is regularly determined and
1805  /// does not need to be loaded from a local.
1806  class RegularPartialArrayDestroy final : public EHScopeStack::Cleanup {
1807  llvm::Value *ArrayBegin;
1808  llvm::Value *ArrayEnd;
1809  QualType ElementType;
1811  CharUnits ElementAlign;
1812  public:
1813  RegularPartialArrayDestroy(llvm::Value *arrayBegin, llvm::Value *arrayEnd,
1814  QualType elementType, CharUnits elementAlign,
1815  CodeGenFunction::Destroyer *destroyer)
1816  : ArrayBegin(arrayBegin), ArrayEnd(arrayEnd),
1817  ElementType(elementType), Destroyer(destroyer),
1818  ElementAlign(elementAlign) {}
1819 
1820  void Emit(CodeGenFunction &CGF, Flags flags) override {
1821  emitPartialArrayDestroy(CGF, ArrayBegin, ArrayEnd,
1822  ElementType, ElementAlign, Destroyer);
1823  }
1824  };
1825 
1826  /// IrregularPartialArrayDestroy - a cleanup which performs a
1827  /// partial array destroy where the end pointer is irregularly
1828  /// determined and must be loaded from a local.
1829  class IrregularPartialArrayDestroy final : public EHScopeStack::Cleanup {
1830  llvm::Value *ArrayBegin;
1831  Address ArrayEndPointer;
1832  QualType ElementType;
1834  CharUnits ElementAlign;
1835  public:
1836  IrregularPartialArrayDestroy(llvm::Value *arrayBegin,
1837  Address arrayEndPointer,
1838  QualType elementType,
1839  CharUnits elementAlign,
1840  CodeGenFunction::Destroyer *destroyer)
1841  : ArrayBegin(arrayBegin), ArrayEndPointer(arrayEndPointer),
1842  ElementType(elementType), Destroyer(destroyer),
1843  ElementAlign(elementAlign) {}
1844 
1845  void Emit(CodeGenFunction &CGF, Flags flags) override {
1846  llvm::Value *arrayEnd = CGF.Builder.CreateLoad(ArrayEndPointer);
1847  emitPartialArrayDestroy(CGF, ArrayBegin, arrayEnd,
1848  ElementType, ElementAlign, Destroyer);
1849  }
1850  };
1851 } // end anonymous namespace
1852 
1853 /// pushIrregularPartialArrayCleanup - Push an EH cleanup to destroy
1854 /// already-constructed elements of the given array. The cleanup
1855 /// may be popped with DeactivateCleanupBlock or PopCleanupBlock.
1856 ///
1857 /// \param elementType - the immediate element type of the array;
1858 /// possibly still an array type
1860  Address arrayEndPointer,
1861  QualType elementType,
1862  CharUnits elementAlign,
1863  Destroyer *destroyer) {
1864  pushFullExprCleanup<IrregularPartialArrayDestroy>(EHCleanup,
1865  arrayBegin, arrayEndPointer,
1866  elementType, elementAlign,
1867  destroyer);
1868 }
1869 
1870 /// pushRegularPartialArrayCleanup - Push an EH cleanup to destroy
1871 /// already-constructed elements of the given array. The cleanup
1872 /// may be popped with DeactivateCleanupBlock or PopCleanupBlock.
1873 ///
1874 /// \param elementType - the immediate element type of the array;
1875 /// possibly still an array type
1877  llvm::Value *arrayEnd,
1878  QualType elementType,
1879  CharUnits elementAlign,
1880  Destroyer *destroyer) {
1881  pushFullExprCleanup<RegularPartialArrayDestroy>(EHCleanup,
1882  arrayBegin, arrayEnd,
1883  elementType, elementAlign,
1884  destroyer);
1885 }
1886 
1887 /// Lazily declare the @llvm.lifetime.start intrinsic.
1889  if (LifetimeStartFn)
1890  return LifetimeStartFn;
1891  LifetimeStartFn = llvm::Intrinsic::getDeclaration(&getModule(),
1892  llvm::Intrinsic::lifetime_start, AllocaInt8PtrTy);
1893  return LifetimeStartFn;
1894 }
1895 
1896 /// Lazily declare the @llvm.lifetime.end intrinsic.
1898  if (LifetimeEndFn)
1899  return LifetimeEndFn;
1900  LifetimeEndFn = llvm::Intrinsic::getDeclaration(&getModule(),
1901  llvm::Intrinsic::lifetime_end, AllocaInt8PtrTy);
1902  return LifetimeEndFn;
1903 }
1904 
1905 namespace {
1906  /// A cleanup to perform a release of an object at the end of a
1907  /// function. This is used to balance out the incoming +1 of a
1908  /// ns_consumed argument when we can't reasonably do that just by
1909  /// not doing the initial retain for a __block argument.
1910  struct ConsumeARCParameter final : EHScopeStack::Cleanup {
1911  ConsumeARCParameter(llvm::Value *param,
1912  ARCPreciseLifetime_t precise)
1913  : Param(param), Precise(precise) {}
1914 
1915  llvm::Value *Param;
1916  ARCPreciseLifetime_t Precise;
1917 
1918  void Emit(CodeGenFunction &CGF, Flags flags) override {
1919  CGF.EmitARCRelease(Param, Precise);
1920  }
1921  };
1922 } // end anonymous namespace
1923 
1924 /// Emit an alloca (or GlobalValue depending on target)
1925 /// for the specified parameter and set up LocalDeclMap.
1927  unsigned ArgNo) {
1928  // FIXME: Why isn't ImplicitParamDecl a ParmVarDecl?
1929  assert((isa<ParmVarDecl>(D) || isa<ImplicitParamDecl>(D)) &&
1930  "Invalid argument to EmitParmDecl");
1931 
1932  Arg.getAnyValue()->setName(D.getName());
1933 
1934  QualType Ty = D.getType();
1935 
1936  // Use better IR generation for certain implicit parameters.
1937  if (auto IPD = dyn_cast<ImplicitParamDecl>(&D)) {
1938  // The only implicit argument a block has is its literal.
1939  // This may be passed as an inalloca'ed value on Windows x86.
1940  if (BlockInfo) {
1941  llvm::Value *V = Arg.isIndirect()
1943  : Arg.getDirectValue();
1944  setBlockContextParameter(IPD, ArgNo, V);
1945  return;
1946  }
1947  }
1948 
1949  Address DeclPtr = Address::invalid();
1950  bool DoStore = false;
1951  bool IsScalar = hasScalarEvaluationKind(Ty);
1952  // If we already have a pointer to the argument, reuse the input pointer.
1953  if (Arg.isIndirect()) {
1954  DeclPtr = Arg.getIndirectAddress();
1955  // If we have a prettier pointer type at this point, bitcast to that.
1956  unsigned AS = DeclPtr.getType()->getAddressSpace();
1957  llvm::Type *IRTy = ConvertTypeForMem(Ty)->getPointerTo(AS);
1958  if (DeclPtr.getType() != IRTy)
1959  DeclPtr = Builder.CreateBitCast(DeclPtr, IRTy, D.getName());
1960  // Indirect argument is in alloca address space, which may be different
1961  // from the default address space.
1962  auto AllocaAS = CGM.getASTAllocaAddressSpace();
1963  auto *V = DeclPtr.getPointer();
1964  auto SrcLangAS = getLangOpts().OpenCL ? LangAS::opencl_private : AllocaAS;
1965  auto DestLangAS =
1967  if (SrcLangAS != DestLangAS) {
1968  assert(getContext().getTargetAddressSpace(SrcLangAS) ==
1969  CGM.getDataLayout().getAllocaAddrSpace());
1970  auto DestAS = getContext().getTargetAddressSpace(DestLangAS);
1971  auto *T = V->getType()->getPointerElementType()->getPointerTo(DestAS);
1972  DeclPtr = Address(getTargetHooks().performAddrSpaceCast(
1973  *this, V, SrcLangAS, DestLangAS, T, true),
1974  DeclPtr.getAlignment());
1975  }
1976 
1977  // Push a destructor cleanup for this parameter if the ABI requires it.
1978  // Don't push a cleanup in a thunk for a method that will also emit a
1979  // cleanup.
1981  Ty->getAs<RecordType>()->getDecl()->isParamDestroyedInCallee()) {
1982  if (QualType::DestructionKind DtorKind = Ty.isDestructedType()) {
1983  assert((DtorKind == QualType::DK_cxx_destructor ||
1984  DtorKind == QualType::DK_nontrivial_c_struct) &&
1985  "unexpected destructor type");
1986  pushDestroy(DtorKind, DeclPtr, Ty);
1987  CalleeDestructedParamCleanups[cast<ParmVarDecl>(&D)] =
1989  }
1990  }
1991  } else {
1992  // Check if the parameter address is controlled by OpenMP runtime.
1993  Address OpenMPLocalAddr =
1994  getLangOpts().OpenMP
1995  ? CGM.getOpenMPRuntime().getAddressOfLocalVariable(*this, &D)
1996  : Address::invalid();
1997  if (getLangOpts().OpenMP && OpenMPLocalAddr.isValid()) {
1998  DeclPtr = OpenMPLocalAddr;
1999  } else {
2000  // Otherwise, create a temporary to hold the value.
2001  DeclPtr = CreateMemTemp(Ty, getContext().getDeclAlign(&D),
2002  D.getName() + ".addr");
2003  }
2004  DoStore = true;
2005  }
2006 
2007  llvm::Value *ArgVal = (DoStore ? Arg.getDirectValue() : nullptr);
2008 
2009  LValue lv = MakeAddrLValue(DeclPtr, Ty);
2010  if (IsScalar) {
2011  Qualifiers qs = Ty.getQualifiers();
2012  if (Qualifiers::ObjCLifetime lt = qs.getObjCLifetime()) {
2013  // We honor __attribute__((ns_consumed)) for types with lifetime.
2014  // For __strong, it's handled by just skipping the initial retain;
2015  // otherwise we have to balance out the initial +1 with an extra
2016  // cleanup to do the release at the end of the function.
2017  bool isConsumed = D.hasAttr<NSConsumedAttr>();
2018 
2019  // 'self' is always formally __strong, but if this is not an
2020  // init method then we don't want to retain it.
2021  if (D.isARCPseudoStrong()) {
2022  const ObjCMethodDecl *method = cast<ObjCMethodDecl>(CurCodeDecl);
2023  assert(&D == method->getSelfDecl());
2024  assert(lt == Qualifiers::OCL_Strong);
2025  assert(qs.hasConst());
2026  assert(method->getMethodFamily() != OMF_init);
2027  (void) method;
2029  }
2030 
2031  // Load objects passed indirectly.
2032  if (Arg.isIndirect() && !ArgVal)
2033  ArgVal = Builder.CreateLoad(DeclPtr);
2034 
2035  if (lt == Qualifiers::OCL_Strong) {
2036  if (!isConsumed) {
2037  if (CGM.getCodeGenOpts().OptimizationLevel == 0) {
2038  // use objc_storeStrong(&dest, value) for retaining the
2039  // object. But first, store a null into 'dest' because
2040  // objc_storeStrong attempts to release its old value.
2041  llvm::Value *Null = CGM.EmitNullConstant(D.getType());
2042  EmitStoreOfScalar(Null, lv, /* isInitialization */ true);
2043  EmitARCStoreStrongCall(lv.getAddress(), ArgVal, true);
2044  DoStore = false;
2045  }
2046  else
2047  // Don't use objc_retainBlock for block pointers, because we
2048  // don't want to Block_copy something just because we got it
2049  // as a parameter.
2050  ArgVal = EmitARCRetainNonBlock(ArgVal);
2051  }
2052  } else {
2053  // Push the cleanup for a consumed parameter.
2054  if (isConsumed) {
2055  ARCPreciseLifetime_t precise = (D.hasAttr<ObjCPreciseLifetimeAttr>()
2057  EHStack.pushCleanup<ConsumeARCParameter>(getARCCleanupKind(), ArgVal,
2058  precise);
2059  }
2060 
2061  if (lt == Qualifiers::OCL_Weak) {
2062  EmitARCInitWeak(DeclPtr, ArgVal);
2063  DoStore = false; // The weak init is a store, no need to do two.
2064  }
2065  }
2066 
2067  // Enter the cleanup scope.
2068  EmitAutoVarWithLifetime(*this, D, DeclPtr, lt);
2069  }
2070  }
2071 
2072  // Store the initial value into the alloca.
2073  if (DoStore)
2074  EmitStoreOfScalar(ArgVal, lv, /* isInitialization */ true);
2075 
2076  setAddrOfLocalVar(&D, DeclPtr);
2077 
2078  // Emit debug info for param declaration.
2079  if (CGDebugInfo *DI = getDebugInfo()) {
2080  if (CGM.getCodeGenOpts().getDebugInfo() >=
2082  DI->EmitDeclareOfArgVariable(&D, DeclPtr.getPointer(), ArgNo, Builder);
2083  }
2084  }
2085 
2086  if (D.hasAttr<AnnotateAttr>())
2087  EmitVarAnnotations(&D, DeclPtr.getPointer());
2088 
2089  // We can only check return value nullability if all arguments to the
2090  // function satisfy their nullability preconditions. This makes it necessary
2091  // to emit null checks for args in the function body itself.
2092  if (requiresReturnValueNullabilityCheck()) {
2093  auto Nullability = Ty->getNullability(getContext());
2095  SanitizerScope SanScope(this);
2096  RetValNullabilityPrecondition =
2097  Builder.CreateAnd(RetValNullabilityPrecondition,
2098  Builder.CreateIsNotNull(Arg.getAnyValue()));
2099  }
2100  }
2101 }
2102 
2104  CodeGenFunction *CGF) {
2105  if (!LangOpts.OpenMP || (!LangOpts.EmitAllDecls && !D->isUsed()))
2106  return;
2107  getOpenMPRuntime().emitUserDefinedReduction(CGF, D);
2108 }
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.
static bool canEmitInitWithFewStoresAfterBZero(llvm::Constant *Init, unsigned &NumStores)
Decide whether we can emit the non-zero parts of the specified initializer with equal or fewer than N...
Definition: CGDecl.cpp:851
void setImplicit(bool I=true)
Definition: DeclBase.h:553
Represents a function declaration or definition.
Definition: Decl.h:1714
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:1604
A (possibly-)qualified type.
Definition: Type.h:655
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:2094
bool isArrayType() const
Definition: Type.h:6155
llvm::Type * ConvertTypeForMem(QualType T)
const CodeGenOptions & getCodeGenOpts() const
void EmitVarDecl(const VarDecl &D)
EmitVarDecl - Emit a local variable declaration.
Definition: CGDecl.cpp:156
Address CreateMemTemp(QualType T, const Twine &Name="tmp", Address *Alloca=nullptr)
CreateMemTemp - Create a temporary memory object of the given type, with appropriate alignmen and cas...
Definition: CGExpr.cpp:139
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:2664
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.
bool isRecordType() const
Definition: Type.h:6179
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:1497
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:2876
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:1651
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:1865
static void emitStoresForInitAfterBZero(CodeGenModule &CGM, llvm::Constant *Init, Address Loc, bool isVolatile, CGBuilderTy &Builder)
For inits that canEmitInitWithFewStoresAfterBZero returned true for, emit the scalar stores that woul...
Definition: CGDecl.cpp:889
Represents an array type, per C99 6.7.5.2 - Array Declarators.
Definition: Type.h:2662
Represents a call to a C++ constructor.
Definition: ExprCXX.h:1240
stable_iterator stable_begin() const
Create a stable reference to the top of the EH stack.
Definition: EHScopeStack.h:379
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:2475
The type is a struct containing a field whose type is not PCK_Trivial.
Definition: Type.h:1109
static bool shouldUseBZeroPlusStoresToInitialize(llvm::Constant *Init, uint64_t GlobalSize)
Decide whether we should use bzero plus some stores to initialize a local variable instead of using a...
Definition: CGDecl.cpp:935
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:3781
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:6519
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:3004
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:154
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:1010
void emitDestroy(Address addr, QualType type, Destroyer *destroyer, bool useEHCleanupForArray)
emitDestroy - Immediately perform the destruction of the given object.
Definition: CGDecl.cpp:1682
void emitByrefStructureInit(const AutoVarEmission &emission)
Initialize the structural components of a __block variable, i.e.
Definition: CGBlocks.cpp:2425
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:1453
RValue EmitReferenceBindingToExpr(const Expr *E)
Emits a reference binding to the passed in expression.
Definition: CGExpr.cpp:556
Qualifiers::ObjCLifetime getObjCLifetime() const
Definition: CGValue.h:266
bool isReferenceType() const
Definition: Type.h:6118
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:1621
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:539
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:1888
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:1876
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
void EmitOMPDeclareReduction(const OMPDeclareReductionDecl *D, CodeGenFunction *CGF=nullptr)
Emit a code for declare reduction construct.
Definition: CGDecl.cpp:2103
An x-value expression is a reference to an object with independent storage but which can be "moved"...
Definition: Specifiers.h:119
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:274
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:2517
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:1994
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:1480
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:1663
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:106
bool hasConst() const
Definition: Type.h:271
static bool isCapturedBy(const VarDecl &, const Expr *)
Determines whether the given __block variable is potentially captured by the given expression...
Definition: CGDecl.cpp:1262
void registerVLASizeExpression(QualType Ty, llvm::Metadata *SizeExpr)
Register VLA size expression debug node with the qualified type.
Definition: CGDebugInfo.h:321
This object can be modified without requiring retains or releases.
Definition: Type.h:175
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:536
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:1045
CXXRecordDecl * getAsCXXRecordDecl() const
Retrieves the CXXRecordDecl that this type refers to, either because the type is a RecordType or beca...
Definition: Type.cpp:1621
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:119
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:3849
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).
Address getOriginalAllocatedAddress() const
Returns the address for the original alloca instruction.
void EmitAutoVarInit(const AutoVarEmission &emission)
Definition: CGDecl.cpp:1325
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...
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:4935
Represents a C++ destructor within a class.
Definition: DeclCXX.h:2698
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:343
DeclContext * getDeclContext()
Definition: DeclBase.h:426
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:296
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:1721
const Type * getBaseElementTypeUnsafe() const
Get the base element type of this type, potentially discarding type qualifiers.
Definition: Type.h:6477
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
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:1268
void enterByrefCleanup(const AutoVarEmission &emission)
Enter a cleanup to destroy a __block variable.
Definition: CGBlocks.cpp:2558
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:171
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:182
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:1631
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:989
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:2398
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:5998
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:1955
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:1774
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:2337
llvm::Value * EmitLifetimeStart(uint64_t Size, llvm::Value *Addr)
Emit a lifetime.begin marker if some criteria are satisfied.
Definition: CGDecl.cpp:963
LangAS getStringLiteralAddressSpace() const
Return the AST address space of string literal, which is used to emit the string literal as global va...
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:1311
bool isObjCObjectPointerType() const
Definition: Type.h:6203
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:1173
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
Address CreateConstInBoundsGEP2_32(Address Addr, unsigned Idx0, unsigned Idx1, const llvm::DataLayout &DL, const llvm::Twine &Name="")
Definition: CGBuilder.h:248
void EmitParmDecl(const VarDecl &D, ParamValue Arg, unsigned ArgNo)
EmitParmDecl - Emit a ParmVarDecl or an ImplicitParamDecl.
Definition: CGDecl.cpp:1926
Assigning into this object requires a lifetime extension.
Definition: Type.h:188
StmtExpr - This is the GNU Statement Expression extension: ({int X=4; X;}).
Definition: Expr.h:3572
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:1897
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:2869
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:680
void EmitCXXDestructorCall(const CXXDestructorDecl *D, CXXDtorType Type, bool ForVirtualBase, bool Delegating, Address This)
Definition: CGClass.cpp:2364
DeclContext - This is used only as base class of specific decl types that can act as declaration cont...
Definition: DeclBase.h:1262
ArrayRef< Capture > captures() const
Definition: Decl.h:3979
const CGFunctionInfo & arrangeFunctionDeclaration(const FunctionDecl *FD)
Free functions are functions that are compatible with an ordinary C function pointer type...
Definition: CGCall.cpp:431
QualType getUnderlyingType() const
Definition: Decl.h:2924
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:420
Decl * getNonClosureContext()
Find the innermost non-closure ancestor of this declaration, walking up through blocks, lambdas, etc.
Definition: DeclBase.cpp:971
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:1772
static bool hasAggregateEvaluationKind(QualType T)
void EmitAutoVarCleanups(const AutoVarEmission &emission)
Definition: CGDecl.cpp:1564
A helper class that allows the use of isa/cast/dyncast to detect TagType objects of structs/unions/cl...
Definition: Type.h:4129
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:2014
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:2805
T * getAttr() const
Definition: DeclBase.h:532
llvm::Type * getElementType() const
Return the type of the values stored in this address.
Definition: Address.h:52
bool isAtomicType() const
Definition: Type.h:6216
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:3699
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:1114
static llvm::Constant * EmitNullConstant(CodeGenModule &CGM, const RecordDecl *record, bool asCompleteObject)
Reading or writing from this object requires a barrier call.
Definition: Type.h:185
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...
QualType getUnqualifiedType() const
Retrieve the unqualified variant of the given type, removing as little sugar as possible.
Definition: Type.h:5962
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:5909
LValue EmitLValue(const Expr *E)
EmitLValue - Emit code to compute a designator that specifies the location of the expression...
Definition: CGExpr.cpp:1199
Address ReturnValue
ReturnValue - The temporary alloca to hold the return value.
bool isSamplerT() const
Definition: Type.h:6260
void pushStackRestore(CleanupKind kind, Address SPMem)
Definition: CGDecl.cpp:1647
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:972
static RValue get(llvm::Value *V)
Definition: CGValue.h:86
void EmitLifetimeEnd(llvm::Value *Size, llvm::Value *Addr)
Definition: CGDecl.cpp:979
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:2745
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:114
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:278
SanitizerMetadata * getSanitizerMetadata()
bool isConstant(const ASTContext &Ctx) const
Definition: Type.h:790
bool CurFuncIsThunk
In C++, whether we are code generating a thunk.
const LangOptions & getLangOpts() const
unsigned getTargetAddressSpace(QualType T) const
Definition: ASTContext.h:2459
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
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:2300
SourceLocation getLocation() const
Definition: DeclBase.h:417
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:1859
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:2486
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:1079