clang  7.0.0
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 /// A byte pattern.
952 ///
953 /// Can be "any" pattern if the value was padding or known to be undef.
954 /// Can be "none" pattern if a sequence doesn't exist.
955 class BytePattern {
956  uint8_t Val;
957  enum class ValueType : uint8_t { Specific, Any, None } Type;
958  BytePattern(ValueType Type) : Type(Type) {}
959 
960 public:
961  BytePattern(uint8_t Value) : Val(Value), Type(ValueType::Specific) {}
962  static BytePattern Any() { return BytePattern(ValueType::Any); }
964  bool isAny() const { return Type == ValueType::Any; }
965  bool isNone() const { return Type == ValueType::None; }
966  bool isValued() const { return Type == ValueType::Specific; }
967  uint8_t getValue() const {
968  assert(isValued());
969  return Val;
970  }
971  BytePattern merge(const BytePattern Other) const {
972  if (isNone() || Other.isNone())
973  return None();
974  if (isAny())
975  return Other;
976  if (Other.isAny())
977  return *this;
978  if (getValue() == Other.getValue())
979  return *this;
980  return None();
981  }
982 };
983 
984 /// Figures out whether the constant can be initialized with memset.
985 static BytePattern constantIsRepeatedBytePattern(llvm::Constant *C) {
986  if (isa<llvm::ConstantAggregateZero>(C) || isa<llvm::ConstantPointerNull>(C))
987  return BytePattern(0x00);
988  if (isa<llvm::UndefValue>(C))
989  return BytePattern::Any();
990 
991  if (isa<llvm::ConstantInt>(C)) {
992  auto *Int = cast<llvm::ConstantInt>(C);
993  if (Int->getBitWidth() % 8 != 0)
994  return BytePattern::None();
995  const llvm::APInt &Value = Int->getValue();
996  if (Value.isSplat(8))
997  return BytePattern(Value.getLoBits(8).getLimitedValue());
998  return BytePattern::None();
999  }
1000 
1001  if (isa<llvm::ConstantFP>(C)) {
1002  auto *FP = cast<llvm::ConstantFP>(C);
1003  llvm::APInt Bits = FP->getValueAPF().bitcastToAPInt();
1004  if (Bits.getBitWidth() % 8 != 0)
1005  return BytePattern::None();
1006  if (!Bits.isSplat(8))
1007  return BytePattern::None();
1008  return BytePattern(Bits.getLimitedValue() & 0xFF);
1009  }
1010 
1011  if (isa<llvm::ConstantVector>(C)) {
1012  llvm::Constant *Splat = cast<llvm::ConstantVector>(C)->getSplatValue();
1013  if (Splat)
1014  return constantIsRepeatedBytePattern(Splat);
1015  return BytePattern::None();
1016  }
1017 
1018  if (isa<llvm::ConstantArray>(C) || isa<llvm::ConstantStruct>(C)) {
1019  BytePattern Pattern(BytePattern::Any());
1020  for (unsigned I = 0, E = C->getNumOperands(); I != E; ++I) {
1021  llvm::Constant *Elt = cast<llvm::Constant>(C->getOperand(I));
1022  Pattern = Pattern.merge(constantIsRepeatedBytePattern(Elt));
1023  if (Pattern.isNone())
1024  return Pattern;
1025  }
1026  return Pattern;
1027  }
1028 
1029  if (llvm::ConstantDataSequential *CDS =
1030  dyn_cast<llvm::ConstantDataSequential>(C)) {
1031  BytePattern Pattern(BytePattern::Any());
1032  for (unsigned I = 0, E = CDS->getNumElements(); I != E; ++I) {
1033  llvm::Constant *Elt = CDS->getElementAsConstant(I);
1034  Pattern = Pattern.merge(constantIsRepeatedBytePattern(Elt));
1035  if (Pattern.isNone())
1036  return Pattern;
1037  }
1038  return Pattern;
1039  }
1040 
1041  // BlockAddress, ConstantExpr, and everything else is scary.
1042  return BytePattern::None();
1043 }
1044 
1045 /// Decide whether we should use memset to initialize a local variable instead
1046 /// of using a memcpy from a constant global. Assumes we've already decided to
1047 /// not user bzero.
1048 /// FIXME We could be more clever, as we are for bzero above, and generate
1049 /// memset followed by stores. It's unclear that's worth the effort.
1050 static BytePattern shouldUseMemSetToInitialize(llvm::Constant *Init,
1051  uint64_t GlobalSize) {
1052  uint64_t SizeLimit = 32;
1053  if (GlobalSize <= SizeLimit)
1054  return BytePattern::None();
1055  return constantIsRepeatedBytePattern(Init);
1056 }
1057 
1058 /// EmitAutoVarDecl - Emit code and set up an entry in LocalDeclMap for a
1059 /// variable declaration with auto, register, or no storage class specifier.
1060 /// These turn into simple stack objects, or GlobalValues depending on target.
1062  AutoVarEmission emission = EmitAutoVarAlloca(D);
1063  EmitAutoVarInit(emission);
1064  EmitAutoVarCleanups(emission);
1065 }
1066 
1067 /// Emit a lifetime.begin marker if some criteria are satisfied.
1068 /// \return a pointer to the temporary size Value if a marker was emitted, null
1069 /// otherwise
1071  llvm::Value *Addr) {
1072  if (!ShouldEmitLifetimeMarkers)
1073  return nullptr;
1074 
1075  assert(Addr->getType()->getPointerAddressSpace() ==
1076  CGM.getDataLayout().getAllocaAddrSpace() &&
1077  "Pointer should be in alloca address space");
1078  llvm::Value *SizeV = llvm::ConstantInt::get(Int64Ty, Size);
1079  Addr = Builder.CreateBitCast(Addr, AllocaInt8PtrTy);
1080  llvm::CallInst *C =
1081  Builder.CreateCall(CGM.getLLVMLifetimeStartFn(), {SizeV, Addr});
1082  C->setDoesNotThrow();
1083  return SizeV;
1084 }
1085 
1087  assert(Addr->getType()->getPointerAddressSpace() ==
1088  CGM.getDataLayout().getAllocaAddrSpace() &&
1089  "Pointer should be in alloca address space");
1090  Addr = Builder.CreateBitCast(Addr, AllocaInt8PtrTy);
1091  llvm::CallInst *C =
1092  Builder.CreateCall(CGM.getLLVMLifetimeEndFn(), {Size, Addr});
1093  C->setDoesNotThrow();
1094 }
1095 
1097  CGDebugInfo *DI, const VarDecl &D, bool EmitDebugInfo) {
1098  // For each dimension stores its QualType and corresponding
1099  // size-expression Value.
1101 
1102  // Break down the array into individual dimensions.
1103  QualType Type1D = D.getType();
1104  while (getContext().getAsVariableArrayType(Type1D)) {
1105  auto VlaSize = getVLAElements1D(Type1D);
1106  if (auto *C = dyn_cast<llvm::ConstantInt>(VlaSize.NumElts))
1107  Dimensions.emplace_back(C, Type1D.getUnqualifiedType());
1108  else {
1109  auto SizeExprAddr = CreateDefaultAlignTempAlloca(
1110  VlaSize.NumElts->getType(), "__vla_expr");
1111  Builder.CreateStore(VlaSize.NumElts, SizeExprAddr);
1112  Dimensions.emplace_back(SizeExprAddr.getPointer(),
1113  Type1D.getUnqualifiedType());
1114  }
1115  Type1D = VlaSize.Type;
1116  }
1117 
1118  if (!EmitDebugInfo)
1119  return;
1120 
1121  // Register each dimension's size-expression with a DILocalVariable,
1122  // so that it can be used by CGDebugInfo when instantiating a DISubrange
1123  // to describe this array.
1124  for (auto &VlaSize : Dimensions) {
1125  llvm::Metadata *MD;
1126  if (auto *C = dyn_cast<llvm::ConstantInt>(VlaSize.NumElts))
1127  MD = llvm::ConstantAsMetadata::get(C);
1128  else {
1129  // Create an artificial VarDecl to generate debug info for.
1130  IdentifierInfo &NameIdent = getContext().Idents.getOwn(
1131  cast<llvm::AllocaInst>(VlaSize.NumElts)->getName());
1132  auto VlaExprTy = VlaSize.NumElts->getType()->getPointerElementType();
1133  auto QT = getContext().getIntTypeForBitwidth(
1134  VlaExprTy->getScalarSizeInBits(), false);
1135  auto *ArtificialDecl = VarDecl::Create(
1136  getContext(), const_cast<DeclContext *>(D.getDeclContext()),
1137  D.getLocation(), D.getLocation(), &NameIdent, QT,
1139  ArtificialDecl->setImplicit();
1140 
1141  MD = DI->EmitDeclareOfAutoVariable(ArtificialDecl, VlaSize.NumElts,
1142  Builder);
1143  }
1144  assert(MD && "No Size expression debug node created");
1145  DI->registerVLASizeExpression(VlaSize.Type, MD);
1146  }
1147 }
1148 
1149 /// EmitAutoVarAlloca - Emit the alloca and debug information for a
1150 /// local variable. Does not emit initialization or destruction.
1153  QualType Ty = D.getType();
1154  assert(
1155  Ty.getAddressSpace() == LangAS::Default ||
1156  (Ty.getAddressSpace() == LangAS::opencl_private && getLangOpts().OpenCL));
1157 
1158  AutoVarEmission emission(D);
1159 
1160  bool isByRef = D.hasAttr<BlocksAttr>();
1161  emission.IsByRef = isByRef;
1162 
1163  CharUnits alignment = getContext().getDeclAlign(&D);
1164 
1165  // If the type is variably-modified, emit all the VLA sizes for it.
1166  if (Ty->isVariablyModifiedType())
1168 
1169  auto *DI = getDebugInfo();
1170  bool EmitDebugInfo = DI && CGM.getCodeGenOpts().getDebugInfo() >=
1172 
1173  Address address = Address::invalid();
1174  Address AllocaAddr = Address::invalid();
1175  if (Ty->isConstantSizeType()) {
1176  bool NRVO = getLangOpts().ElideConstructors &&
1177  D.isNRVOVariable();
1178 
1179  // If this value is an array or struct with a statically determinable
1180  // constant initializer, there are optimizations we can do.
1181  //
1182  // TODO: We should constant-evaluate the initializer of any variable,
1183  // as long as it is initialized by a constant expression. Currently,
1184  // isConstantInitializer produces wrong answers for structs with
1185  // reference or bitfield members, and a few other cases, and checking
1186  // for POD-ness protects us from some of these.
1187  if (D.getInit() && (Ty->isArrayType() || Ty->isRecordType()) &&
1188  (D.isConstexpr() ||
1189  ((Ty.isPODType(getContext()) ||
1191  D.getInit()->isConstantInitializer(getContext(), false)))) {
1192 
1193  // If the variable's a const type, and it's neither an NRVO
1194  // candidate nor a __block variable and has no mutable members,
1195  // emit it as a global instead.
1196  // Exception is if a variable is located in non-constant address space
1197  // in OpenCL.
1198  if ((!getLangOpts().OpenCL ||
1200  (CGM.getCodeGenOpts().MergeAllConstants && !NRVO && !isByRef &&
1201  CGM.isTypeConstant(Ty, true))) {
1203 
1204  // Signal this condition to later callbacks.
1205  emission.Addr = Address::invalid();
1206  assert(emission.wasEmittedAsGlobal());
1207  return emission;
1208  }
1209 
1210  // Otherwise, tell the initialization code that we're in this case.
1211  emission.IsConstantAggregate = true;
1212  }
1213 
1214  // A normal fixed sized variable becomes an alloca in the entry block,
1215  // unless:
1216  // - it's an NRVO variable.
1217  // - we are compiling OpenMP and it's an OpenMP local variable.
1218 
1219  Address OpenMPLocalAddr =
1220  getLangOpts().OpenMP
1221  ? CGM.getOpenMPRuntime().getAddressOfLocalVariable(*this, &D)
1222  : Address::invalid();
1223  if (getLangOpts().OpenMP && OpenMPLocalAddr.isValid()) {
1224  address = OpenMPLocalAddr;
1225  } else if (NRVO) {
1226  // The named return value optimization: allocate this variable in the
1227  // return slot, so that we can elide the copy when returning this
1228  // variable (C++0x [class.copy]p34).
1229  address = ReturnValue;
1230 
1231  if (const RecordType *RecordTy = Ty->getAs<RecordType>()) {
1232  const auto *RD = RecordTy->getDecl();
1233  const auto *CXXRD = dyn_cast<CXXRecordDecl>(RD);
1234  if ((CXXRD && !CXXRD->hasTrivialDestructor()) ||
1235  RD->isNonTrivialToPrimitiveDestroy()) {
1236  // Create a flag that is used to indicate when the NRVO was applied
1237  // to this variable. Set it to zero to indicate that NRVO was not
1238  // applied.
1239  llvm::Value *Zero = Builder.getFalse();
1240  Address NRVOFlag =
1241  CreateTempAlloca(Zero->getType(), CharUnits::One(), "nrvo");
1243  Builder.CreateStore(Zero, NRVOFlag);
1244 
1245  // Record the NRVO flag for this variable.
1246  NRVOFlags[&D] = NRVOFlag.getPointer();
1247  emission.NRVOFlag = NRVOFlag.getPointer();
1248  }
1249  }
1250  } else {
1251  CharUnits allocaAlignment;
1252  llvm::Type *allocaTy;
1253  if (isByRef) {
1254  auto &byrefInfo = getBlockByrefInfo(&D);
1255  allocaTy = byrefInfo.Type;
1256  allocaAlignment = byrefInfo.ByrefAlignment;
1257  } else {
1258  allocaTy = ConvertTypeForMem(Ty);
1259  allocaAlignment = alignment;
1260  }
1261 
1262  // Create the alloca. Note that we set the name separately from
1263  // building the instruction so that it's there even in no-asserts
1264  // builds.
1265  address = CreateTempAlloca(allocaTy, allocaAlignment, D.getName(),
1266  /*ArraySize=*/nullptr, &AllocaAddr);
1267 
1268  // Don't emit lifetime markers for MSVC catch parameters. The lifetime of
1269  // the catch parameter starts in the catchpad instruction, and we can't
1270  // insert code in those basic blocks.
1271  bool IsMSCatchParam =
1273 
1274  // Emit a lifetime intrinsic if meaningful. There's no point in doing this
1275  // if we don't have a valid insertion point (?).
1276  if (HaveInsertPoint() && !IsMSCatchParam) {
1277  // If there's a jump into the lifetime of this variable, its lifetime
1278  // gets broken up into several regions in IR, which requires more work
1279  // to handle correctly. For now, just omit the intrinsics; this is a
1280  // rare case, and it's better to just be conservatively correct.
1281  // PR28267.
1282  //
1283  // We have to do this in all language modes if there's a jump past the
1284  // declaration. We also have to do it in C if there's a jump to an
1285  // earlier point in the current block because non-VLA lifetimes begin as
1286  // soon as the containing block is entered, not when its variables
1287  // actually come into scope; suppressing the lifetime annotations
1288  // completely in this case is unnecessarily pessimistic, but again, this
1289  // is rare.
1290  if (!Bypasses.IsBypassed(&D) &&
1291  !(!getLangOpts().CPlusPlus && hasLabelBeenSeenInCurrentScope())) {
1292  uint64_t size = CGM.getDataLayout().getTypeAllocSize(allocaTy);
1293  emission.SizeForLifetimeMarkers =
1294  EmitLifetimeStart(size, AllocaAddr.getPointer());
1295  }
1296  } else {
1297  assert(!emission.useLifetimeMarkers());
1298  }
1299  }
1300  } else {
1302 
1303  if (!DidCallStackSave) {
1304  // Save the stack.
1305  Address Stack =
1306  CreateTempAlloca(Int8PtrTy, getPointerAlign(), "saved_stack");
1307 
1308  llvm::Value *F = CGM.getIntrinsic(llvm::Intrinsic::stacksave);
1309  llvm::Value *V = Builder.CreateCall(F);
1310  Builder.CreateStore(V, Stack);
1311 
1312  DidCallStackSave = true;
1313 
1314  // Push a cleanup block and restore the stack there.
1315  // FIXME: in general circumstances, this should be an EH cleanup.
1317  }
1318 
1319  auto VlaSize = getVLASize(Ty);
1320  llvm::Type *llvmTy = ConvertTypeForMem(VlaSize.Type);
1321 
1322  // Allocate memory for the array.
1323  address = CreateTempAlloca(llvmTy, alignment, "vla", VlaSize.NumElts,
1324  &AllocaAddr);
1325 
1326  // If we have debug info enabled, properly describe the VLA dimensions for
1327  // this type by registering the vla size expression for each of the
1328  // dimensions.
1329  EmitAndRegisterVariableArrayDimensions(DI, D, EmitDebugInfo);
1330  }
1331 
1332  setAddrOfLocalVar(&D, address);
1333  emission.Addr = address;
1334  emission.AllocaAddr = AllocaAddr;
1335 
1336  // Emit debug info for local var declaration.
1337  if (EmitDebugInfo && HaveInsertPoint()) {
1338  DI->setLocation(D.getLocation());
1339  (void)DI->EmitDeclareOfAutoVariable(&D, address.getPointer(), Builder);
1340  }
1341 
1342  if (D.hasAttr<AnnotateAttr>())
1343  EmitVarAnnotations(&D, address.getPointer());
1344 
1345  // Make sure we call @llvm.lifetime.end.
1346  if (emission.useLifetimeMarkers())
1348  emission.getOriginalAllocatedAddress(),
1349  emission.getSizeForLifetimeMarkers());
1350 
1351  return emission;
1352 }
1353 
1354 static bool isCapturedBy(const VarDecl &, const Expr *);
1355 
1356 /// Determines whether the given __block variable is potentially
1357 /// captured by the given statement.
1358 static bool isCapturedBy(const VarDecl &Var, const Stmt *S) {
1359  if (const Expr *E = dyn_cast<Expr>(S))
1360  return isCapturedBy(Var, E);
1361  for (const Stmt *SubStmt : S->children())
1362  if (isCapturedBy(Var, SubStmt))
1363  return true;
1364  return false;
1365 }
1366 
1367 /// Determines whether the given __block variable is potentially
1368 /// captured by the given expression.
1369 static bool isCapturedBy(const VarDecl &Var, const Expr *E) {
1370  // Skip the most common kinds of expressions that make
1371  // hierarchy-walking expensive.
1372  E = E->IgnoreParenCasts();
1373 
1374  if (const BlockExpr *BE = dyn_cast<BlockExpr>(E)) {
1375  const BlockDecl *Block = BE->getBlockDecl();
1376  for (const auto &I : Block->captures()) {
1377  if (I.getVariable() == &Var)
1378  return true;
1379  }
1380 
1381  // No need to walk into the subexpressions.
1382  return false;
1383  }
1384 
1385  if (const StmtExpr *SE = dyn_cast<StmtExpr>(E)) {
1386  const CompoundStmt *CS = SE->getSubStmt();
1387  for (const auto *BI : CS->body())
1388  if (const auto *BIE = dyn_cast<Expr>(BI)) {
1389  if (isCapturedBy(Var, BIE))
1390  return true;
1391  }
1392  else if (const auto *DS = dyn_cast<DeclStmt>(BI)) {
1393  // special case declarations
1394  for (const auto *I : DS->decls()) {
1395  if (const auto *VD = dyn_cast<VarDecl>((I))) {
1396  const Expr *Init = VD->getInit();
1397  if (Init && isCapturedBy(Var, Init))
1398  return true;
1399  }
1400  }
1401  }
1402  else
1403  // FIXME. Make safe assumption assuming arbitrary statements cause capturing.
1404  // Later, provide code to poke into statements for capture analysis.
1405  return true;
1406  return false;
1407  }
1408 
1409  for (const Stmt *SubStmt : E->children())
1410  if (isCapturedBy(Var, SubStmt))
1411  return true;
1412 
1413  return false;
1414 }
1415 
1416 /// Determine whether the given initializer is trivial in the sense
1417 /// that it requires no code to be generated.
1419  if (!Init)
1420  return true;
1421 
1422  if (const CXXConstructExpr *Construct = dyn_cast<CXXConstructExpr>(Init))
1423  if (CXXConstructorDecl *Constructor = Construct->getConstructor())
1424  if (Constructor->isTrivial() &&
1425  Constructor->isDefaultConstructor() &&
1426  !Construct->requiresZeroInitialization())
1427  return true;
1428 
1429  return false;
1430 }
1431 
1433  assert(emission.Variable && "emission was not valid!");
1434 
1435  // If this was emitted as a global constant, we're done.
1436  if (emission.wasEmittedAsGlobal()) return;
1437 
1438  const VarDecl &D = *emission.Variable;
1440  QualType type = D.getType();
1441 
1442  // If this local has an initializer, emit it now.
1443  const Expr *Init = D.getInit();
1444 
1445  // If we are at an unreachable point, we don't need to emit the initializer
1446  // unless it contains a label.
1447  if (!HaveInsertPoint()) {
1448  if (!Init || !ContainsLabel(Init)) return;
1450  }
1451 
1452  // Initialize the structure of a __block variable.
1453  if (emission.IsByRef)
1454  emitByrefStructureInit(emission);
1455 
1456  // Initialize the variable here if it doesn't have a initializer and it is a
1457  // C struct that is non-trivial to initialize or an array containing such a
1458  // struct.
1459  if (!Init &&
1460  type.isNonTrivialToPrimitiveDefaultInitialize() ==
1462  LValue Dst = MakeAddrLValue(emission.getAllocatedAddress(), type);
1463  if (emission.IsByRef)
1464  drillIntoBlockVariable(*this, Dst, &D);
1466  return;
1467  }
1468 
1469  if (isTrivialInitializer(Init))
1470  return;
1471 
1472  // Check whether this is a byref variable that's potentially
1473  // captured and moved by its own initializer. If so, we'll need to
1474  // emit the initializer first, then copy into the variable.
1475  bool capturedByInit = emission.IsByRef && isCapturedBy(D, Init);
1476 
1477  Address Loc =
1478  capturedByInit ? emission.Addr : emission.getObjectAddress(*this);
1479 
1480  llvm::Constant *constant = nullptr;
1481  if (emission.IsConstantAggregate || D.isConstexpr()) {
1482  assert(!capturedByInit && "constant init contains a capturing block?");
1483  constant = ConstantEmitter(*this).tryEmitAbstractForInitializer(D);
1484  }
1485 
1486  if (!constant) {
1487  LValue lv = MakeAddrLValue(Loc, type);
1488  lv.setNonGC(true);
1489  return EmitExprAsInit(Init, &D, lv, capturedByInit);
1490  }
1491 
1492  if (!emission.IsConstantAggregate) {
1493  // For simple scalar/complex initialization, store the value directly.
1494  LValue lv = MakeAddrLValue(Loc, type);
1495  lv.setNonGC(true);
1496  return EmitStoreThroughLValue(RValue::get(constant), lv, true);
1497  }
1498 
1499  // If this is a simple aggregate initialization, we can optimize it
1500  // in various ways.
1501  bool isVolatile = type.isVolatileQualified();
1502 
1503  llvm::Value *SizeVal =
1504  llvm::ConstantInt::get(IntPtrTy,
1505  getContext().getTypeSizeInChars(type).getQuantity());
1506 
1507  llvm::Type *BP = CGM.Int8Ty->getPointerTo(Loc.getAddressSpace());
1508  if (Loc.getType() != BP)
1509  Loc = Builder.CreateBitCast(Loc, BP);
1510 
1511  // If the initializer is all or mostly the same, codegen with bzero / memset
1512  // then do a few stores afterward.
1513  uint64_t ConstantSize =
1514  CGM.getDataLayout().getTypeAllocSize(constant->getType());
1515  if (shouldUseBZeroPlusStoresToInitialize(constant, ConstantSize)) {
1516  Builder.CreateMemSet(Loc, llvm::ConstantInt::get(Int8Ty, 0), SizeVal,
1517  isVolatile);
1518  // Zero and undef don't require a stores.
1519  if (!constant->isNullValue() && !isa<llvm::UndefValue>(constant)) {
1520  Loc = Builder.CreateBitCast(Loc,
1521  constant->getType()->getPointerTo(Loc.getAddressSpace()));
1522  emitStoresForInitAfterBZero(CGM, constant, Loc, isVolatile, Builder);
1523  }
1524  return;
1525  }
1526 
1527  BytePattern Pattern = shouldUseMemSetToInitialize(constant, ConstantSize);
1528  if (!Pattern.isNone()) {
1529  uint8_t Value = Pattern.isAny() ? 0x00 : Pattern.getValue();
1530  Builder.CreateMemSet(Loc, llvm::ConstantInt::get(Int8Ty, Value), SizeVal,
1531  isVolatile);
1532  return;
1533  }
1534 
1535  // Otherwise, create a temporary global with the initializer then
1536  // memcpy from the global to the alloca.
1537  std::string Name = getStaticDeclName(CGM, D);
1538  unsigned AS = CGM.getContext().getTargetAddressSpace(
1540  BP = llvm::PointerType::getInt8PtrTy(getLLVMContext(), AS);
1541 
1542  llvm::GlobalVariable *GV = new llvm::GlobalVariable(
1543  CGM.getModule(), constant->getType(), true,
1544  llvm::GlobalValue::PrivateLinkage, constant, Name, nullptr,
1545  llvm::GlobalValue::NotThreadLocal, AS);
1546  GV->setAlignment(Loc.getAlignment().getQuantity());
1547  GV->setUnnamedAddr(llvm::GlobalValue::UnnamedAddr::Global);
1548 
1549  Address SrcPtr = Address(GV, Loc.getAlignment());
1550  if (SrcPtr.getType() != BP)
1551  SrcPtr = Builder.CreateBitCast(SrcPtr, BP);
1552 
1553  Builder.CreateMemCpy(Loc, SrcPtr, SizeVal, isVolatile);
1554 }
1555 
1556 /// Emit an expression as an initializer for an object (variable, field, etc.)
1557 /// at the given location. The expression is not necessarily the normal
1558 /// initializer for the object, and the address is not necessarily
1559 /// its normal location.
1560 ///
1561 /// \param init the initializing expression
1562 /// \param D the object to act as if we're initializing
1563 /// \param loc the address to initialize; its type is a pointer
1564 /// to the LLVM mapping of the object's type
1565 /// \param alignment the alignment of the address
1566 /// \param capturedByInit true if \p D is a __block variable
1567 /// whose address is potentially changed by the initializer
1569  LValue lvalue, bool capturedByInit) {
1570  QualType type = D->getType();
1571 
1572  if (type->isReferenceType()) {
1573  RValue rvalue = EmitReferenceBindingToExpr(init);
1574  if (capturedByInit)
1575  drillIntoBlockVariable(*this, lvalue, cast<VarDecl>(D));
1576  EmitStoreThroughLValue(rvalue, lvalue, true);
1577  return;
1578  }
1579  switch (getEvaluationKind(type)) {
1580  case TEK_Scalar:
1581  EmitScalarInit(init, D, lvalue, capturedByInit);
1582  return;
1583  case TEK_Complex: {
1584  ComplexPairTy complex = EmitComplexExpr(init);
1585  if (capturedByInit)
1586  drillIntoBlockVariable(*this, lvalue, cast<VarDecl>(D));
1587  EmitStoreOfComplex(complex, lvalue, /*init*/ true);
1588  return;
1589  }
1590  case TEK_Aggregate:
1591  if (type->isAtomicType()) {
1592  EmitAtomicInit(const_cast<Expr*>(init), lvalue);
1593  } else {
1595  if (isa<VarDecl>(D))
1596  Overlap = AggValueSlot::DoesNotOverlap;
1597  else if (auto *FD = dyn_cast<FieldDecl>(D))
1598  Overlap = overlapForFieldInit(FD);
1599  // TODO: how can we delay here if D is captured by its initializer?
1600  EmitAggExpr(init, AggValueSlot::forLValue(lvalue,
1604  Overlap));
1605  }
1606  return;
1607  }
1608  llvm_unreachable("bad evaluation kind");
1609 }
1610 
1611 /// Enter a destroy cleanup for the given local variable.
1613  const CodeGenFunction::AutoVarEmission &emission,
1614  QualType::DestructionKind dtorKind) {
1615  assert(dtorKind != QualType::DK_none);
1616 
1617  // Note that for __block variables, we want to destroy the
1618  // original stack object, not the possibly forwarded object.
1619  Address addr = emission.getObjectAddress(*this);
1620 
1621  const VarDecl *var = emission.Variable;
1622  QualType type = var->getType();
1623 
1624  CleanupKind cleanupKind = NormalAndEHCleanup;
1625  CodeGenFunction::Destroyer *destroyer = nullptr;
1626 
1627  switch (dtorKind) {
1628  case QualType::DK_none:
1629  llvm_unreachable("no cleanup for trivially-destructible variable");
1630 
1632  // If there's an NRVO flag on the emission, we need a different
1633  // cleanup.
1634  if (emission.NRVOFlag) {
1635  assert(!type->isArrayType());
1637  EHStack.pushCleanup<DestroyNRVOVariableCXX>(cleanupKind, addr, dtor,
1638  emission.NRVOFlag);
1639  return;
1640  }
1641  break;
1642 
1644  // Suppress cleanups for pseudo-strong variables.
1645  if (var->isARCPseudoStrong()) return;
1646 
1647  // Otherwise, consider whether to use an EH cleanup or not.
1648  cleanupKind = getARCCleanupKind();
1649 
1650  // Use the imprecise destroyer by default.
1651  if (!var->hasAttr<ObjCPreciseLifetimeAttr>())
1653  break;
1654 
1656  break;
1657 
1660  if (emission.NRVOFlag) {
1661  assert(!type->isArrayType());
1662  EHStack.pushCleanup<DestroyNRVOVariableC>(cleanupKind, addr,
1663  emission.NRVOFlag, type);
1664  return;
1665  }
1666  break;
1667  }
1668 
1669  // If we haven't chosen a more specific destroyer, use the default.
1670  if (!destroyer) destroyer = getDestroyer(dtorKind);
1671 
1672  // Use an EH cleanup in array destructors iff the destructor itself
1673  // is being pushed as an EH cleanup.
1674  bool useEHCleanup = (cleanupKind & EHCleanup);
1675  EHStack.pushCleanup<DestroyObject>(cleanupKind, addr, type, destroyer,
1676  useEHCleanup);
1677 }
1678 
1680  assert(emission.Variable && "emission was not valid!");
1681 
1682  // If this was emitted as a global constant, we're done.
1683  if (emission.wasEmittedAsGlobal()) return;
1684 
1685  // If we don't have an insertion point, we're done. Sema prevents
1686  // us from jumping into any of these scopes anyway.
1687  if (!HaveInsertPoint()) return;
1688 
1689  const VarDecl &D = *emission.Variable;
1690 
1691  // Check the type for a cleanup.
1692  if (QualType::DestructionKind dtorKind = D.getType().isDestructedType())
1693  emitAutoVarTypeCleanup(emission, dtorKind);
1694 
1695  // In GC mode, honor objc_precise_lifetime.
1696  if (getLangOpts().getGC() != LangOptions::NonGC &&
1697  D.hasAttr<ObjCPreciseLifetimeAttr>()) {
1698  EHStack.pushCleanup<ExtendGCLifetime>(NormalCleanup, &D);
1699  }
1700 
1701  // Handle the cleanup attribute.
1702  if (const CleanupAttr *CA = D.getAttr<CleanupAttr>()) {
1703  const FunctionDecl *FD = CA->getFunctionDecl();
1704 
1705  llvm::Constant *F = CGM.GetAddrOfFunction(FD);
1706  assert(F && "Could not find function!");
1707 
1709  EHStack.pushCleanup<CallCleanupFunction>(NormalAndEHCleanup, F, &Info, &D);
1710  }
1711 
1712  // If this is a block variable, call _Block_object_destroy
1713  // (on the unforwarded address). Don't enter this cleanup if we're in pure-GC
1714  // mode.
1715  if (emission.IsByRef && CGM.getLangOpts().getGC() != LangOptions::GCOnly) {
1717  if (emission.Variable->getType().isObjCGCWeak())
1718  Flags |= BLOCK_FIELD_IS_WEAK;
1719  enterByrefCleanup(NormalAndEHCleanup, emission.Addr, Flags,
1720  /*LoadBlockVarAddr*/ false);
1721  }
1722 }
1723 
1726  switch (kind) {
1727  case QualType::DK_none: llvm_unreachable("no destroyer for trivial dtor");
1729  return destroyCXXObject;
1731  return destroyARCStrongPrecise;
1733  return destroyARCWeak;
1735  return destroyNonTrivialCStruct;
1736  }
1737  llvm_unreachable("Unknown DestructionKind");
1738 }
1739 
1740 /// pushEHDestroy - Push the standard destructor for the given type as
1741 /// an EH-only cleanup.
1743  Address addr, QualType type) {
1744  assert(dtorKind && "cannot push destructor for trivial type");
1745  assert(needsEHCleanup(dtorKind));
1746 
1747  pushDestroy(EHCleanup, addr, type, getDestroyer(dtorKind), true);
1748 }
1749 
1750 /// pushDestroy - Push the standard destructor for the given type as
1751 /// at least a normal cleanup.
1753  Address addr, QualType type) {
1754  assert(dtorKind && "cannot push destructor for trivial type");
1755 
1756  CleanupKind cleanupKind = getCleanupKind(dtorKind);
1757  pushDestroy(cleanupKind, addr, type, getDestroyer(dtorKind),
1758  cleanupKind & EHCleanup);
1759 }
1760 
1762  QualType type, Destroyer *destroyer,
1763  bool useEHCleanupForArray) {
1764  pushFullExprCleanup<DestroyObject>(cleanupKind, addr, type,
1765  destroyer, useEHCleanupForArray);
1766 }
1767 
1769  EHStack.pushCleanup<CallStackRestore>(Kind, SPMem);
1770 }
1771 
1773  CleanupKind cleanupKind, Address addr, QualType type,
1774  Destroyer *destroyer, bool useEHCleanupForArray) {
1775  // Push an EH-only cleanup for the object now.
1776  // FIXME: When popping normal cleanups, we need to keep this EH cleanup
1777  // around in case a temporary's destructor throws an exception.
1778  if (cleanupKind & EHCleanup)
1779  EHStack.pushCleanup<DestroyObject>(
1780  static_cast<CleanupKind>(cleanupKind & ~NormalCleanup), addr, type,
1781  destroyer, useEHCleanupForArray);
1782 
1783  // Remember that we need to push a full cleanup for the object at the
1784  // end of the full-expression.
1785  pushCleanupAfterFullExpr<DestroyObject>(
1786  cleanupKind, addr, type, destroyer, useEHCleanupForArray);
1787 }
1788 
1789 /// emitDestroy - Immediately perform the destruction of the given
1790 /// object.
1791 ///
1792 /// \param addr - the address of the object; a type*
1793 /// \param type - the type of the object; if an array type, all
1794 /// objects are destroyed in reverse order
1795 /// \param destroyer - the function to call to destroy individual
1796 /// elements
1797 /// \param useEHCleanupForArray - whether an EH cleanup should be
1798 /// used when destroying array elements, in case one of the
1799 /// destructions throws an exception
1801  Destroyer *destroyer,
1802  bool useEHCleanupForArray) {
1803  const ArrayType *arrayType = getContext().getAsArrayType(type);
1804  if (!arrayType)
1805  return destroyer(*this, addr, type);
1806 
1807  llvm::Value *length = emitArrayLength(arrayType, type, addr);
1808 
1809  CharUnits elementAlign =
1810  addr.getAlignment()
1811  .alignmentOfArrayElement(getContext().getTypeSizeInChars(type));
1812 
1813  // Normally we have to check whether the array is zero-length.
1814  bool checkZeroLength = true;
1815 
1816  // But if the array length is constant, we can suppress that.
1817  if (llvm::ConstantInt *constLength = dyn_cast<llvm::ConstantInt>(length)) {
1818  // ...and if it's constant zero, we can just skip the entire thing.
1819  if (constLength->isZero()) return;
1820  checkZeroLength = false;
1821  }
1822 
1823  llvm::Value *begin = addr.getPointer();
1824  llvm::Value *end = Builder.CreateInBoundsGEP(begin, length);
1825  emitArrayDestroy(begin, end, type, elementAlign, destroyer,
1826  checkZeroLength, useEHCleanupForArray);
1827 }
1828 
1829 /// emitArrayDestroy - Destroys all the elements of the given array,
1830 /// beginning from last to first. The array cannot be zero-length.
1831 ///
1832 /// \param begin - a type* denoting the first element of the array
1833 /// \param end - a type* denoting one past the end of the array
1834 /// \param elementType - the element type of the array
1835 /// \param destroyer - the function to call to destroy elements
1836 /// \param useEHCleanup - whether to push an EH cleanup to destroy
1837 /// the remaining elements in case the destruction of a single
1838 /// element throws
1840  llvm::Value *end,
1841  QualType elementType,
1842  CharUnits elementAlign,
1843  Destroyer *destroyer,
1844  bool checkZeroLength,
1845  bool useEHCleanup) {
1846  assert(!elementType->isArrayType());
1847 
1848  // The basic structure here is a do-while loop, because we don't
1849  // need to check for the zero-element case.
1850  llvm::BasicBlock *bodyBB = createBasicBlock("arraydestroy.body");
1851  llvm::BasicBlock *doneBB = createBasicBlock("arraydestroy.done");
1852 
1853  if (checkZeroLength) {
1854  llvm::Value *isEmpty = Builder.CreateICmpEQ(begin, end,
1855  "arraydestroy.isempty");
1856  Builder.CreateCondBr(isEmpty, doneBB, bodyBB);
1857  }
1858 
1859  // Enter the loop body, making that address the current address.
1860  llvm::BasicBlock *entryBB = Builder.GetInsertBlock();
1861  EmitBlock(bodyBB);
1862  llvm::PHINode *elementPast =
1863  Builder.CreatePHI(begin->getType(), 2, "arraydestroy.elementPast");
1864  elementPast->addIncoming(end, entryBB);
1865 
1866  // Shift the address back by one element.
1867  llvm::Value *negativeOne = llvm::ConstantInt::get(SizeTy, -1, true);
1868  llvm::Value *element = Builder.CreateInBoundsGEP(elementPast, negativeOne,
1869  "arraydestroy.element");
1870 
1871  if (useEHCleanup)
1872  pushRegularPartialArrayCleanup(begin, element, elementType, elementAlign,
1873  destroyer);
1874 
1875  // Perform the actual destruction there.
1876  destroyer(*this, Address(element, elementAlign), elementType);
1877 
1878  if (useEHCleanup)
1879  PopCleanupBlock();
1880 
1881  // Check whether we've reached the end.
1882  llvm::Value *done = Builder.CreateICmpEQ(element, begin, "arraydestroy.done");
1883  Builder.CreateCondBr(done, doneBB, bodyBB);
1884  elementPast->addIncoming(element, Builder.GetInsertBlock());
1885 
1886  // Done.
1887  EmitBlock(doneBB);
1888 }
1889 
1890 /// Perform partial array destruction as if in an EH cleanup. Unlike
1891 /// emitArrayDestroy, the element type here may still be an array type.
1893  llvm::Value *begin, llvm::Value *end,
1894  QualType type, CharUnits elementAlign,
1895  CodeGenFunction::Destroyer *destroyer) {
1896  // If the element type is itself an array, drill down.
1897  unsigned arrayDepth = 0;
1898  while (const ArrayType *arrayType = CGF.getContext().getAsArrayType(type)) {
1899  // VLAs don't require a GEP index to walk into.
1900  if (!isa<VariableArrayType>(arrayType))
1901  arrayDepth++;
1902  type = arrayType->getElementType();
1903  }
1904 
1905  if (arrayDepth) {
1906  llvm::Value *zero = llvm::ConstantInt::get(CGF.SizeTy, 0);
1907 
1908  SmallVector<llvm::Value*,4> gepIndices(arrayDepth+1, zero);
1909  begin = CGF.Builder.CreateInBoundsGEP(begin, gepIndices, "pad.arraybegin");
1910  end = CGF.Builder.CreateInBoundsGEP(end, gepIndices, "pad.arrayend");
1911  }
1912 
1913  // Destroy the array. We don't ever need an EH cleanup because we
1914  // assume that we're in an EH cleanup ourselves, so a throwing
1915  // destructor causes an immediate terminate.
1916  CGF.emitArrayDestroy(begin, end, type, elementAlign, destroyer,
1917  /*checkZeroLength*/ true, /*useEHCleanup*/ false);
1918 }
1919 
1920 namespace {
1921  /// RegularPartialArrayDestroy - a cleanup which performs a partial
1922  /// array destroy where the end pointer is regularly determined and
1923  /// does not need to be loaded from a local.
1924  class RegularPartialArrayDestroy final : public EHScopeStack::Cleanup {
1925  llvm::Value *ArrayBegin;
1926  llvm::Value *ArrayEnd;
1927  QualType ElementType;
1929  CharUnits ElementAlign;
1930  public:
1931  RegularPartialArrayDestroy(llvm::Value *arrayBegin, llvm::Value *arrayEnd,
1932  QualType elementType, CharUnits elementAlign,
1933  CodeGenFunction::Destroyer *destroyer)
1934  : ArrayBegin(arrayBegin), ArrayEnd(arrayEnd),
1935  ElementType(elementType), Destroyer(destroyer),
1936  ElementAlign(elementAlign) {}
1937 
1938  void Emit(CodeGenFunction &CGF, Flags flags) override {
1939  emitPartialArrayDestroy(CGF, ArrayBegin, ArrayEnd,
1940  ElementType, ElementAlign, Destroyer);
1941  }
1942  };
1943 
1944  /// IrregularPartialArrayDestroy - a cleanup which performs a
1945  /// partial array destroy where the end pointer is irregularly
1946  /// determined and must be loaded from a local.
1947  class IrregularPartialArrayDestroy final : public EHScopeStack::Cleanup {
1948  llvm::Value *ArrayBegin;
1949  Address ArrayEndPointer;
1950  QualType ElementType;
1952  CharUnits ElementAlign;
1953  public:
1954  IrregularPartialArrayDestroy(llvm::Value *arrayBegin,
1955  Address arrayEndPointer,
1956  QualType elementType,
1957  CharUnits elementAlign,
1958  CodeGenFunction::Destroyer *destroyer)
1959  : ArrayBegin(arrayBegin), ArrayEndPointer(arrayEndPointer),
1960  ElementType(elementType), Destroyer(destroyer),
1961  ElementAlign(elementAlign) {}
1962 
1963  void Emit(CodeGenFunction &CGF, Flags flags) override {
1964  llvm::Value *arrayEnd = CGF.Builder.CreateLoad(ArrayEndPointer);
1965  emitPartialArrayDestroy(CGF, ArrayBegin, arrayEnd,
1966  ElementType, ElementAlign, Destroyer);
1967  }
1968  };
1969 } // end anonymous namespace
1970 
1971 /// pushIrregularPartialArrayCleanup - Push an EH cleanup to destroy
1972 /// already-constructed elements of the given array. The cleanup
1973 /// may be popped with DeactivateCleanupBlock or PopCleanupBlock.
1974 ///
1975 /// \param elementType - the immediate element type of the array;
1976 /// possibly still an array type
1978  Address arrayEndPointer,
1979  QualType elementType,
1980  CharUnits elementAlign,
1981  Destroyer *destroyer) {
1982  pushFullExprCleanup<IrregularPartialArrayDestroy>(EHCleanup,
1983  arrayBegin, arrayEndPointer,
1984  elementType, elementAlign,
1985  destroyer);
1986 }
1987 
1988 /// pushRegularPartialArrayCleanup - Push an EH cleanup to destroy
1989 /// already-constructed elements of the given array. The cleanup
1990 /// may be popped with DeactivateCleanupBlock or PopCleanupBlock.
1991 ///
1992 /// \param elementType - the immediate element type of the array;
1993 /// possibly still an array type
1995  llvm::Value *arrayEnd,
1996  QualType elementType,
1997  CharUnits elementAlign,
1998  Destroyer *destroyer) {
1999  pushFullExprCleanup<RegularPartialArrayDestroy>(EHCleanup,
2000  arrayBegin, arrayEnd,
2001  elementType, elementAlign,
2002  destroyer);
2003 }
2004 
2005 /// Lazily declare the @llvm.lifetime.start intrinsic.
2007  if (LifetimeStartFn)
2008  return LifetimeStartFn;
2009  LifetimeStartFn = llvm::Intrinsic::getDeclaration(&getModule(),
2010  llvm::Intrinsic::lifetime_start, AllocaInt8PtrTy);
2011  return LifetimeStartFn;
2012 }
2013 
2014 /// Lazily declare the @llvm.lifetime.end intrinsic.
2016  if (LifetimeEndFn)
2017  return LifetimeEndFn;
2018  LifetimeEndFn = llvm::Intrinsic::getDeclaration(&getModule(),
2019  llvm::Intrinsic::lifetime_end, AllocaInt8PtrTy);
2020  return LifetimeEndFn;
2021 }
2022 
2023 namespace {
2024  /// A cleanup to perform a release of an object at the end of a
2025  /// function. This is used to balance out the incoming +1 of a
2026  /// ns_consumed argument when we can't reasonably do that just by
2027  /// not doing the initial retain for a __block argument.
2028  struct ConsumeARCParameter final : EHScopeStack::Cleanup {
2029  ConsumeARCParameter(llvm::Value *param,
2030  ARCPreciseLifetime_t precise)
2031  : Param(param), Precise(precise) {}
2032 
2033  llvm::Value *Param;
2034  ARCPreciseLifetime_t Precise;
2035 
2036  void Emit(CodeGenFunction &CGF, Flags flags) override {
2037  CGF.EmitARCRelease(Param, Precise);
2038  }
2039  };
2040 } // end anonymous namespace
2041 
2042 /// Emit an alloca (or GlobalValue depending on target)
2043 /// for the specified parameter and set up LocalDeclMap.
2045  unsigned ArgNo) {
2046  // FIXME: Why isn't ImplicitParamDecl a ParmVarDecl?
2047  assert((isa<ParmVarDecl>(D) || isa<ImplicitParamDecl>(D)) &&
2048  "Invalid argument to EmitParmDecl");
2049 
2050  Arg.getAnyValue()->setName(D.getName());
2051 
2052  QualType Ty = D.getType();
2053 
2054  // Use better IR generation for certain implicit parameters.
2055  if (auto IPD = dyn_cast<ImplicitParamDecl>(&D)) {
2056  // The only implicit argument a block has is its literal.
2057  // This may be passed as an inalloca'ed value on Windows x86.
2058  if (BlockInfo) {
2059  llvm::Value *V = Arg.isIndirect()
2061  : Arg.getDirectValue();
2062  setBlockContextParameter(IPD, ArgNo, V);
2063  return;
2064  }
2065  }
2066 
2067  Address DeclPtr = Address::invalid();
2068  bool DoStore = false;
2069  bool IsScalar = hasScalarEvaluationKind(Ty);
2070  // If we already have a pointer to the argument, reuse the input pointer.
2071  if (Arg.isIndirect()) {
2072  DeclPtr = Arg.getIndirectAddress();
2073  // If we have a prettier pointer type at this point, bitcast to that.
2074  unsigned AS = DeclPtr.getType()->getAddressSpace();
2075  llvm::Type *IRTy = ConvertTypeForMem(Ty)->getPointerTo(AS);
2076  if (DeclPtr.getType() != IRTy)
2077  DeclPtr = Builder.CreateBitCast(DeclPtr, IRTy, D.getName());
2078  // Indirect argument is in alloca address space, which may be different
2079  // from the default address space.
2080  auto AllocaAS = CGM.getASTAllocaAddressSpace();
2081  auto *V = DeclPtr.getPointer();
2082  auto SrcLangAS = getLangOpts().OpenCL ? LangAS::opencl_private : AllocaAS;
2083  auto DestLangAS =
2085  if (SrcLangAS != DestLangAS) {
2086  assert(getContext().getTargetAddressSpace(SrcLangAS) ==
2087  CGM.getDataLayout().getAllocaAddrSpace());
2088  auto DestAS = getContext().getTargetAddressSpace(DestLangAS);
2089  auto *T = V->getType()->getPointerElementType()->getPointerTo(DestAS);
2090  DeclPtr = Address(getTargetHooks().performAddrSpaceCast(
2091  *this, V, SrcLangAS, DestLangAS, T, true),
2092  DeclPtr.getAlignment());
2093  }
2094 
2095  // Push a destructor cleanup for this parameter if the ABI requires it.
2096  // Don't push a cleanup in a thunk for a method that will also emit a
2097  // cleanup.
2099  Ty->getAs<RecordType>()->getDecl()->isParamDestroyedInCallee()) {
2100  if (QualType::DestructionKind DtorKind = Ty.isDestructedType()) {
2101  assert((DtorKind == QualType::DK_cxx_destructor ||
2102  DtorKind == QualType::DK_nontrivial_c_struct) &&
2103  "unexpected destructor type");
2104  pushDestroy(DtorKind, DeclPtr, Ty);
2105  CalleeDestructedParamCleanups[cast<ParmVarDecl>(&D)] =
2107  }
2108  }
2109  } else {
2110  // Check if the parameter address is controlled by OpenMP runtime.
2111  Address OpenMPLocalAddr =
2112  getLangOpts().OpenMP
2113  ? CGM.getOpenMPRuntime().getAddressOfLocalVariable(*this, &D)
2114  : Address::invalid();
2115  if (getLangOpts().OpenMP && OpenMPLocalAddr.isValid()) {
2116  DeclPtr = OpenMPLocalAddr;
2117  } else {
2118  // Otherwise, create a temporary to hold the value.
2119  DeclPtr = CreateMemTemp(Ty, getContext().getDeclAlign(&D),
2120  D.getName() + ".addr");
2121  }
2122  DoStore = true;
2123  }
2124 
2125  llvm::Value *ArgVal = (DoStore ? Arg.getDirectValue() : nullptr);
2126 
2127  LValue lv = MakeAddrLValue(DeclPtr, Ty);
2128  if (IsScalar) {
2129  Qualifiers qs = Ty.getQualifiers();
2130  if (Qualifiers::ObjCLifetime lt = qs.getObjCLifetime()) {
2131  // We honor __attribute__((ns_consumed)) for types with lifetime.
2132  // For __strong, it's handled by just skipping the initial retain;
2133  // otherwise we have to balance out the initial +1 with an extra
2134  // cleanup to do the release at the end of the function.
2135  bool isConsumed = D.hasAttr<NSConsumedAttr>();
2136 
2137  // 'self' is always formally __strong, but if this is not an
2138  // init method then we don't want to retain it.
2139  if (D.isARCPseudoStrong()) {
2140  const ObjCMethodDecl *method = cast<ObjCMethodDecl>(CurCodeDecl);
2141  assert(&D == method->getSelfDecl());
2142  assert(lt == Qualifiers::OCL_Strong);
2143  assert(qs.hasConst());
2144  assert(method->getMethodFamily() != OMF_init);
2145  (void) method;
2147  }
2148 
2149  // Load objects passed indirectly.
2150  if (Arg.isIndirect() && !ArgVal)
2151  ArgVal = Builder.CreateLoad(DeclPtr);
2152 
2153  if (lt == Qualifiers::OCL_Strong) {
2154  if (!isConsumed) {
2155  if (CGM.getCodeGenOpts().OptimizationLevel == 0) {
2156  // use objc_storeStrong(&dest, value) for retaining the
2157  // object. But first, store a null into 'dest' because
2158  // objc_storeStrong attempts to release its old value.
2159  llvm::Value *Null = CGM.EmitNullConstant(D.getType());
2160  EmitStoreOfScalar(Null, lv, /* isInitialization */ true);
2161  EmitARCStoreStrongCall(lv.getAddress(), ArgVal, true);
2162  DoStore = false;
2163  }
2164  else
2165  // Don't use objc_retainBlock for block pointers, because we
2166  // don't want to Block_copy something just because we got it
2167  // as a parameter.
2168  ArgVal = EmitARCRetainNonBlock(ArgVal);
2169  }
2170  } else {
2171  // Push the cleanup for a consumed parameter.
2172  if (isConsumed) {
2173  ARCPreciseLifetime_t precise = (D.hasAttr<ObjCPreciseLifetimeAttr>()
2175  EHStack.pushCleanup<ConsumeARCParameter>(getARCCleanupKind(), ArgVal,
2176  precise);
2177  }
2178 
2179  if (lt == Qualifiers::OCL_Weak) {
2180  EmitARCInitWeak(DeclPtr, ArgVal);
2181  DoStore = false; // The weak init is a store, no need to do two.
2182  }
2183  }
2184 
2185  // Enter the cleanup scope.
2186  EmitAutoVarWithLifetime(*this, D, DeclPtr, lt);
2187  }
2188  }
2189 
2190  // Store the initial value into the alloca.
2191  if (DoStore)
2192  EmitStoreOfScalar(ArgVal, lv, /* isInitialization */ true);
2193 
2194  setAddrOfLocalVar(&D, DeclPtr);
2195 
2196  // Emit debug info for param declaration.
2197  if (CGDebugInfo *DI = getDebugInfo()) {
2198  if (CGM.getCodeGenOpts().getDebugInfo() >=
2200  DI->EmitDeclareOfArgVariable(&D, DeclPtr.getPointer(), ArgNo, Builder);
2201  }
2202  }
2203 
2204  if (D.hasAttr<AnnotateAttr>())
2205  EmitVarAnnotations(&D, DeclPtr.getPointer());
2206 
2207  // We can only check return value nullability if all arguments to the
2208  // function satisfy their nullability preconditions. This makes it necessary
2209  // to emit null checks for args in the function body itself.
2210  if (requiresReturnValueNullabilityCheck()) {
2211  auto Nullability = Ty->getNullability(getContext());
2213  SanitizerScope SanScope(this);
2214  RetValNullabilityPrecondition =
2215  Builder.CreateAnd(RetValNullabilityPrecondition,
2216  Builder.CreateIsNotNull(Arg.getAnyValue()));
2217  }
2218  }
2219 }
2220 
2222  CodeGenFunction *CGF) {
2223  if (!LangOpts.OpenMP || (!LangOpts.EmitAllDecls && !D->isUsed()))
2224  return;
2225  getOpenMPRuntime().emitUserDefinedReduction(CGF, D);
2226 }
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 BytePattern constantIsRepeatedBytePattern(llvm::Constant *C)
Figures out whether the constant can be initialized with memset.
Definition: CGDecl.cpp:985
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:555
Represents a function declaration or definition.
Definition: Decl.h:1716
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:1725
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:2104
bool isArrayType() const
Definition: Type.h:6162
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:2665
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:6186
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:1612
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:2877
void EmitAutoVarDecl(const VarDecl &D)
EmitAutoVarDecl - Emit an auto variable declaration.
Definition: CGDecl.cpp:1061
static Destroyer destroyARCStrongPrecise
void pushLifetimeExtendedDestroy(CleanupKind kind, Address addr, QualType type, Destroyer *destroyer, bool useEHCleanupForArray)
Definition: CGDecl.cpp:1772
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:2668
Represents a call to a C++ constructor.
Definition: ExprCXX.h:1292
BytePattern(uint8_t Value)
Definition: CGDecl.cpp:961
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:2477
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:3782
Represents a variable declaration or definition.
Definition: Decl.h:814
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:6526
uint8_t getValue() const
Definition: CGDecl.cpp:967
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:3092
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:1356
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:1800
void emitByrefStructureInit(const AutoVarEmission &emission)
Initialize the structural components of a __block variable, i.e.
Definition: CGBlocks.cpp:2487
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:1568
RValue EmitReferenceBindingToExpr(const Expr *E)
Emits a reference binding to the passed in expression.
Definition: CGExpr.cpp:556
A byte pattern.
Definition: CGDecl.cpp:955
Qualifiers::ObjCLifetime getObjCLifetime() const
Definition: CGValue.h:266
bool isReferenceType() const
Definition: Type.h:6125
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:1742
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:545
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:2006
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:1994
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:2221
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:1383
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:2544
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:1482
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:1369
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:1080
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:538
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:616
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:1152
CXXRecordDecl * getAsCXXRecordDecl() const
Retrieves the CXXRecordDecl that this type refers to, either because the type is a RecordType or beca...
Definition: Type.cpp:1627
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:3860
Represent the declaration of a variable (in which case it is an lvalue) a function (in which case it ...
Definition: Decl.h:637
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:1432
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:1035
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:5051
Represents a C++ destructor within a class.
Definition: DeclCXX.h:2700
const internal::VariadicAllOfMatcher< Decl > decl
Matches declarations.
bool isNone() const
Definition: CGDecl.cpp:965
bool isExceptionVariable() const
Determine whether this variable is the exception variable in a C++ catch statememt or an Objective-C ...
Definition: Decl.h:1306
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:428
static SVal getValue(SVal val, SValBuilder &svalBuilder)
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:1839
const Type * getBaseElementTypeUnsafe() const
Get the base element type of this type, potentially discarding type qualifiers.
Definition: Type.h:6484
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:446
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:1292
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:1752
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:1096
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:647
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:6005
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:1958
static BytePattern shouldUseMemSetToInitialize(llvm::Constant *Init, uint64_t GlobalSize)
Decide whether we should use memset to initialize a local variable instead of using a memcpy from a c...
Definition: CGDecl.cpp:1050
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:1892
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:2399
llvm::Value * EmitLifetimeStart(uint64_t Size, llvm::Value *Addr)
Emit a lifetime.begin marker if some criteria are satisfied.
Definition: CGDecl.cpp:1070
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
static BytePattern Any()
Definition: CGDecl.cpp:962
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:1418
bool isObjCObjectPointerType() const
Definition: Type.h:6210
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:2044
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:3654
QualType getType() const
Definition: CGValue.h:264
BytePattern merge(const BytePattern Other) const
Definition: CGDecl.cpp:971
llvm::Constant * getLLVMLifetimeEndFn()
Lazily declare the .lifetime.end intrinsic.
Definition: CGDecl.cpp:2015
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.
bool isObjCGCWeak() const
true when Type is objc&#39;s weak.
Definition: Type.h:1069
Base class for declarations which introduce a typedef-name.
Definition: Decl.h:2872
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:2376
DeclContext - This is used only as base class of specific decl types that can act as declaration cont...
Definition: DeclBase.h:1264
ArrayRef< Capture > captures() const
Definition: Decl.h:3990
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:2927
const Expr * getInit() const
Definition: Decl.h:1219
bool isAny() const
Definition: CGDecl.cpp:964
llvm::LoadInst * CreateLoad(Address Addr, const llvm::Twine &Name="")
Definition: CGBuilder.h:70
Kind getKind() const
Definition: DeclBase.h:422
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
static AggValueSlot forLValue(const LValue &LV, IsDestructed_t isDestructed, NeedsGCBarriers_t needsGC, IsAliased_t isAliased, Overlap_t mayOverlap, IsZeroed_t isZeroed=IsNotZeroed, IsSanitizerChecked_t isChecked=IsNotSanitizerChecked)
Definition: CGValue.h:540
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:1679
A helper class that allows the use of isa/cast/dyncast to detect TagType objects of structs/unions/cl...
Definition: Type.h:4135
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:2024
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:2832
T * getAttr() const
Definition: DeclBase.h:534
llvm::Type * getElementType() const
Return the type of the values stored in this address.
Definition: Address.h:52
bool isAtomicType() const
Definition: Type.h:6223
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:3711
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:1160
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:5969
Represents a C++ struct/union/class.
Definition: DeclCXX.h:302
bool isNRVOVariable() const
Determine whether this local variable can be used with the named return value optimization (NRVO)...
Definition: Decl.h:1324
llvm::Type * ConvertType(QualType T)
Qualifiers getQualifiers() const
Retrieve the set of qualifiers applied to this type.
Definition: Type.h:5916
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:6267
static BytePattern None()
Definition: CGDecl.cpp:963
void pushStackRestore(CleanupKind kind, Address SPMem)
Definition: CGDecl.cpp:1768
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:1068
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.
bool isValued() const
Definition: CGDecl.cpp:966
A reference to a declared variable, function, enum, etc.
Definition: Expr.h:974
static RValue get(llvm::Value *V)
Definition: CGValue.h:86
void EmitLifetimeEnd(llvm::Value *Size, llvm::Value *Addr)
Definition: CGDecl.cpp:1086
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:2746
bool isLocalVarDecl() const
Returns true for local variable declarations other than parameters.
Definition: Decl.h:1104
QualType getType() const
Definition: Decl.h:648
An l-value expression is a reference to an object with independent storage.
Definition: Specifiers.h:114
void enterByrefCleanup(CleanupKind Kind, Address Addr, BlockFieldFlags Flags, bool LoadBlockVarAddr)
Enter a cleanup to destroy a __block variable.
Definition: CGBlocks.cpp:2603
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:2481
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:651
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:2362
SourceLocation getLocation() const
Definition: DeclBase.h:419
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:1977
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:2513
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