clang  5.0.0
CGDeclCXX.cpp
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1 //===--- CGDeclCXX.cpp - Emit LLVM Code for C++ 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 dealing with code generation of C++ declarations
11 //
12 //===----------------------------------------------------------------------===//
13 
14 #include "CodeGenFunction.h"
15 #include "CGCXXABI.h"
16 #include "CGObjCRuntime.h"
17 #include "CGOpenMPRuntime.h"
19 #include "llvm/ADT/StringExtras.h"
20 #include "llvm/IR/Intrinsics.h"
21 #include "llvm/Support/Path.h"
22 
23 using namespace clang;
24 using namespace CodeGen;
25 
26 static void EmitDeclInit(CodeGenFunction &CGF, const VarDecl &D,
27  ConstantAddress DeclPtr) {
28  assert(D.hasGlobalStorage() && "VarDecl must have global storage!");
29  assert(!D.getType()->isReferenceType() &&
30  "Should not call EmitDeclInit on a reference!");
31 
32  QualType type = D.getType();
33  LValue lv = CGF.MakeAddrLValue(DeclPtr, type);
34 
35  const Expr *Init = D.getInit();
36  switch (CGF.getEvaluationKind(type)) {
37  case TEK_Scalar: {
38  CodeGenModule &CGM = CGF.CGM;
39  if (lv.isObjCStrong())
41  DeclPtr, D.getTLSKind());
42  else if (lv.isObjCWeak())
44  DeclPtr);
45  else
46  CGF.EmitScalarInit(Init, &D, lv, false);
47  return;
48  }
49  case TEK_Complex:
50  CGF.EmitComplexExprIntoLValue(Init, lv, /*isInit*/ true);
51  return;
52  case TEK_Aggregate:
56  return;
57  }
58  llvm_unreachable("bad evaluation kind");
59 }
60 
61 /// Emit code to cause the destruction of the given variable with
62 /// static storage duration.
63 static void EmitDeclDestroy(CodeGenFunction &CGF, const VarDecl &D,
64  ConstantAddress addr) {
65  CodeGenModule &CGM = CGF.CGM;
66 
67  // FIXME: __attribute__((cleanup)) ?
68 
69  QualType type = D.getType();
71 
72  switch (dtorKind) {
73  case QualType::DK_none:
74  return;
75 
77  break;
78 
81  // We don't care about releasing objects during process teardown.
82  assert(!D.getTLSKind() && "should have rejected this");
83  return;
84  }
85 
86  llvm::Constant *function;
87  llvm::Constant *argument;
88 
89  // Special-case non-array C++ destructors, if they have the right signature.
90  // Under some ABIs, destructors return this instead of void, and cannot be
91  // passed directly to __cxa_atexit if the target does not allow this mismatch.
92  const CXXRecordDecl *Record = type->getAsCXXRecordDecl();
93  bool CanRegisterDestructor =
94  Record && (!CGM.getCXXABI().HasThisReturn(
95  GlobalDecl(Record->getDestructor(), Dtor_Complete)) ||
97  // If __cxa_atexit is disabled via a flag, a different helper function is
98  // generated elsewhere which uses atexit instead, and it takes the destructor
99  // directly.
100  bool UsingExternalHelper = !CGM.getCodeGenOpts().CXAAtExit;
101  if (Record && (CanRegisterDestructor || UsingExternalHelper)) {
102  assert(!Record->hasTrivialDestructor());
103  CXXDestructorDecl *dtor = Record->getDestructor();
104 
105  function = CGM.getAddrOfCXXStructor(dtor, StructorType::Complete);
106  argument = llvm::ConstantExpr::getBitCast(
107  addr.getPointer(), CGF.getTypes().ConvertType(type)->getPointerTo());
108 
109  // Otherwise, the standard logic requires a helper function.
110  } else {
111  function = CodeGenFunction(CGM)
112  .generateDestroyHelper(addr, type, CGF.getDestroyer(dtorKind),
113  CGF.needsEHCleanup(dtorKind), &D);
114  argument = llvm::Constant::getNullValue(CGF.Int8PtrTy);
115  }
116 
117  CGM.getCXXABI().registerGlobalDtor(CGF, D, function, argument);
118 }
119 
120 /// Emit code to cause the variable at the given address to be considered as
121 /// constant from this point onwards.
122 static void EmitDeclInvariant(CodeGenFunction &CGF, const VarDecl &D,
123  llvm::Constant *Addr) {
124  // Do not emit the intrinsic if we're not optimizing.
125  if (!CGF.CGM.getCodeGenOpts().OptimizationLevel)
126  return;
127 
128  // Grab the llvm.invariant.start intrinsic.
129  llvm::Intrinsic::ID InvStartID = llvm::Intrinsic::invariant_start;
130  // Overloaded address space type.
131  llvm::Type *ObjectPtr[1] = {CGF.Int8PtrTy};
132  llvm::Constant *InvariantStart = CGF.CGM.getIntrinsic(InvStartID, ObjectPtr);
133 
134  // Emit a call with the size in bytes of the object.
135  CharUnits WidthChars = CGF.getContext().getTypeSizeInChars(D.getType());
136  uint64_t Width = WidthChars.getQuantity();
137  llvm::Value *Args[2] = { llvm::ConstantInt::getSigned(CGF.Int64Ty, Width),
138  llvm::ConstantExpr::getBitCast(Addr, CGF.Int8PtrTy)};
139  CGF.Builder.CreateCall(InvariantStart, Args);
140 }
141 
143  llvm::Constant *DeclPtr,
144  bool PerformInit) {
145 
146  const Expr *Init = D.getInit();
147  QualType T = D.getType();
148 
149  // The address space of a static local variable (DeclPtr) may be different
150  // from the address space of the "this" argument of the constructor. In that
151  // case, we need an addrspacecast before calling the constructor.
152  //
153  // struct StructWithCtor {
154  // __device__ StructWithCtor() {...}
155  // };
156  // __device__ void foo() {
157  // __shared__ StructWithCtor s;
158  // ...
159  // }
160  //
161  // For example, in the above CUDA code, the static local variable s has a
162  // "shared" address space qualifier, but the constructor of StructWithCtor
163  // expects "this" in the "generic" address space.
164  unsigned ExpectedAddrSpace = getContext().getTargetAddressSpace(T);
165  unsigned ActualAddrSpace = DeclPtr->getType()->getPointerAddressSpace();
166  if (ActualAddrSpace != ExpectedAddrSpace) {
168  llvm::PointerType *PTy = llvm::PointerType::get(LTy, ExpectedAddrSpace);
169  DeclPtr = llvm::ConstantExpr::getAddrSpaceCast(DeclPtr, PTy);
170  }
171 
172  ConstantAddress DeclAddr(DeclPtr, getContext().getDeclAlign(&D));
173 
174  if (!T->isReferenceType()) {
175  if (getLangOpts().OpenMP && D.hasAttr<OMPThreadPrivateDeclAttr>())
176  (void)CGM.getOpenMPRuntime().emitThreadPrivateVarDefinition(
177  &D, DeclAddr, D.getAttr<OMPThreadPrivateDeclAttr>()->getLocation(),
178  PerformInit, this);
179  if (PerformInit)
180  EmitDeclInit(*this, D, DeclAddr);
181  if (CGM.isTypeConstant(D.getType(), true))
182  EmitDeclInvariant(*this, D, DeclPtr);
183  else
184  EmitDeclDestroy(*this, D, DeclAddr);
185  return;
186  }
187 
188  assert(PerformInit && "cannot have constant initializer which needs "
189  "destruction for reference");
191  EmitStoreOfScalar(RV.getScalarVal(), DeclAddr, false, T);
192 }
193 
194 /// Create a stub function, suitable for being passed to atexit,
195 /// which passes the given address to the given destructor function.
196 llvm::Constant *CodeGenFunction::createAtExitStub(const VarDecl &VD,
197  llvm::Constant *dtor,
198  llvm::Constant *addr) {
199  // Get the destructor function type, void(*)(void).
200  llvm::FunctionType *ty = llvm::FunctionType::get(CGM.VoidTy, false);
201  SmallString<256> FnName;
202  {
203  llvm::raw_svector_ostream Out(FnName);
205  }
206 
208  llvm::Function *fn = CGM.CreateGlobalInitOrDestructFunction(ty, FnName.str(),
209  FI,
210  VD.getLocation());
211 
212  CodeGenFunction CGF(CGM);
213 
214  CGF.StartFunction(&VD, CGM.getContext().VoidTy, fn, FI, FunctionArgList());
215 
216  llvm::CallInst *call = CGF.Builder.CreateCall(dtor, addr);
217 
218  // Make sure the call and the callee agree on calling convention.
219  if (llvm::Function *dtorFn =
220  dyn_cast<llvm::Function>(dtor->stripPointerCasts()))
221  call->setCallingConv(dtorFn->getCallingConv());
222 
223  CGF.FinishFunction();
224 
225  return fn;
226 }
227 
228 /// Register a global destructor using the C atexit runtime function.
230  llvm::Constant *dtor,
231  llvm::Constant *addr) {
232  // Create a function which calls the destructor.
233  llvm::Constant *dtorStub = createAtExitStub(VD, dtor, addr);
234 
235  // extern "C" int atexit(void (*f)(void));
236  llvm::FunctionType *atexitTy =
237  llvm::FunctionType::get(IntTy, dtorStub->getType(), false);
238 
239  llvm::Constant *atexit =
240  CGM.CreateRuntimeFunction(atexitTy, "atexit", llvm::AttributeList(),
241  /*Local=*/true);
242  if (llvm::Function *atexitFn = dyn_cast<llvm::Function>(atexit))
243  atexitFn->setDoesNotThrow();
244 
245  EmitNounwindRuntimeCall(atexit, dtorStub);
246 }
247 
249  llvm::GlobalVariable *DeclPtr,
250  bool PerformInit) {
251  // If we've been asked to forbid guard variables, emit an error now.
252  // This diagnostic is hard-coded for Darwin's use case; we can find
253  // better phrasing if someone else needs it.
254  if (CGM.getCodeGenOpts().ForbidGuardVariables)
255  CGM.Error(D.getLocation(),
256  "this initialization requires a guard variable, which "
257  "the kernel does not support");
258 
259  CGM.getCXXABI().EmitGuardedInit(*this, D, DeclPtr, PerformInit);
260 }
261 
263  llvm::FunctionType *FTy, const Twine &Name, const CGFunctionInfo &FI,
264  SourceLocation Loc, bool TLS) {
265  llvm::Function *Fn =
267  Name, &getModule());
268  if (!getLangOpts().AppleKext && !TLS) {
269  // Set the section if needed.
270  if (const char *Section = getTarget().getStaticInitSectionSpecifier())
271  Fn->setSection(Section);
272  }
273 
274  SetInternalFunctionAttributes(nullptr, Fn, FI);
275 
276  Fn->setCallingConv(getRuntimeCC());
277 
278  if (!getLangOpts().Exceptions)
279  Fn->setDoesNotThrow();
280 
281  if (!isInSanitizerBlacklist(Fn, Loc)) {
282  if (getLangOpts().Sanitize.hasOneOf(SanitizerKind::Address |
283  SanitizerKind::KernelAddress))
284  Fn->addFnAttr(llvm::Attribute::SanitizeAddress);
285  if (getLangOpts().Sanitize.has(SanitizerKind::Thread))
286  Fn->addFnAttr(llvm::Attribute::SanitizeThread);
287  if (getLangOpts().Sanitize.has(SanitizerKind::Memory))
288  Fn->addFnAttr(llvm::Attribute::SanitizeMemory);
289  if (getLangOpts().Sanitize.has(SanitizerKind::SafeStack))
290  Fn->addFnAttr(llvm::Attribute::SafeStack);
291  }
292 
293  return Fn;
294 }
295 
296 /// Create a global pointer to a function that will initialize a global
297 /// variable. The user has requested that this pointer be emitted in a specific
298 /// section.
299 void CodeGenModule::EmitPointerToInitFunc(const VarDecl *D,
300  llvm::GlobalVariable *GV,
301  llvm::Function *InitFunc,
302  InitSegAttr *ISA) {
303  llvm::GlobalVariable *PtrArray = new llvm::GlobalVariable(
304  TheModule, InitFunc->getType(), /*isConstant=*/true,
305  llvm::GlobalValue::PrivateLinkage, InitFunc, "__cxx_init_fn_ptr");
306  PtrArray->setSection(ISA->getSection());
307  addUsedGlobal(PtrArray);
308 
309  // If the GV is already in a comdat group, then we have to join it.
310  if (llvm::Comdat *C = GV->getComdat())
311  PtrArray->setComdat(C);
312 }
313 
314 void
315 CodeGenModule::EmitCXXGlobalVarDeclInitFunc(const VarDecl *D,
316  llvm::GlobalVariable *Addr,
317  bool PerformInit) {
318 
319  // According to E.2.3.1 in CUDA-7.5 Programming guide: __device__,
320  // __constant__ and __shared__ variables defined in namespace scope,
321  // that are of class type, cannot have a non-empty constructor. All
322  // the checks have been done in Sema by now. Whatever initializers
323  // are allowed are empty and we just need to ignore them here.
324  if (getLangOpts().CUDA && getLangOpts().CUDAIsDevice &&
325  (D->hasAttr<CUDADeviceAttr>() || D->hasAttr<CUDAConstantAttr>() ||
326  D->hasAttr<CUDASharedAttr>()))
327  return;
328 
329  // Check if we've already initialized this decl.
330  auto I = DelayedCXXInitPosition.find(D);
331  if (I != DelayedCXXInitPosition.end() && I->second == ~0U)
332  return;
333 
334  llvm::FunctionType *FTy = llvm::FunctionType::get(VoidTy, false);
335  SmallString<256> FnName;
336  {
337  llvm::raw_svector_ostream Out(FnName);
339  }
340 
341  // Create a variable initialization function.
342  llvm::Function *Fn =
343  CreateGlobalInitOrDestructFunction(FTy, FnName.str(),
345  D->getLocation());
346 
347  auto *ISA = D->getAttr<InitSegAttr>();
349  PerformInit);
350 
351  llvm::GlobalVariable *COMDATKey =
352  supportsCOMDAT() && D->isExternallyVisible() ? Addr : nullptr;
353 
354  if (D->getTLSKind()) {
355  // FIXME: Should we support init_priority for thread_local?
356  // FIXME: We only need to register one __cxa_thread_atexit function for the
357  // entire TU.
358  CXXThreadLocalInits.push_back(Fn);
359  CXXThreadLocalInitVars.push_back(D);
360  } else if (PerformInit && ISA) {
361  EmitPointerToInitFunc(D, Addr, Fn, ISA);
362  } else if (auto *IPA = D->getAttr<InitPriorityAttr>()) {
363  OrderGlobalInits Key(IPA->getPriority(), PrioritizedCXXGlobalInits.size());
364  PrioritizedCXXGlobalInits.push_back(std::make_pair(Key, Fn));
366  // C++ [basic.start.init]p2:
367  // Definitions of explicitly specialized class template static data
368  // members have ordered initialization. Other class template static data
369  // members (i.e., implicitly or explicitly instantiated specializations)
370  // have unordered initialization.
371  //
372  // As a consequence, we can put them into their own llvm.global_ctors entry.
373  //
374  // If the global is externally visible, put the initializer into a COMDAT
375  // group with the global being initialized. On most platforms, this is a
376  // minor startup time optimization. In the MS C++ ABI, there are no guard
377  // variables, so this COMDAT key is required for correctness.
378  AddGlobalCtor(Fn, 65535, COMDATKey);
379  } else if (D->hasAttr<SelectAnyAttr>()) {
380  // SelectAny globals will be comdat-folded. Put the initializer into a
381  // COMDAT group associated with the global, so the initializers get folded
382  // too.
383  AddGlobalCtor(Fn, 65535, COMDATKey);
384  } else {
385  I = DelayedCXXInitPosition.find(D); // Re-do lookup in case of re-hash.
386  if (I == DelayedCXXInitPosition.end()) {
387  CXXGlobalInits.push_back(Fn);
388  } else if (I->second != ~0U) {
389  assert(I->second < CXXGlobalInits.size() &&
390  CXXGlobalInits[I->second] == nullptr);
391  CXXGlobalInits[I->second] = Fn;
392  }
393  }
394 
395  // Remember that we already emitted the initializer for this global.
396  DelayedCXXInitPosition[D] = ~0U;
397 }
398 
399 void CodeGenModule::EmitCXXThreadLocalInitFunc() {
401  *this, CXXThreadLocals, CXXThreadLocalInits, CXXThreadLocalInitVars);
402 
403  CXXThreadLocalInits.clear();
404  CXXThreadLocalInitVars.clear();
405  CXXThreadLocals.clear();
406 }
407 
408 void
409 CodeGenModule::EmitCXXGlobalInitFunc() {
410  while (!CXXGlobalInits.empty() && !CXXGlobalInits.back())
411  CXXGlobalInits.pop_back();
412 
413  if (CXXGlobalInits.empty() && PrioritizedCXXGlobalInits.empty())
414  return;
415 
416  llvm::FunctionType *FTy = llvm::FunctionType::get(VoidTy, false);
418 
419  // Create our global initialization function.
420  if (!PrioritizedCXXGlobalInits.empty()) {
421  SmallVector<llvm::Function *, 8> LocalCXXGlobalInits;
422  llvm::array_pod_sort(PrioritizedCXXGlobalInits.begin(),
423  PrioritizedCXXGlobalInits.end());
424  // Iterate over "chunks" of ctors with same priority and emit each chunk
425  // into separate function. Note - everything is sorted first by priority,
426  // second - by lex order, so we emit ctor functions in proper order.
428  I = PrioritizedCXXGlobalInits.begin(),
429  E = PrioritizedCXXGlobalInits.end(); I != E; ) {
431  PrioE = std::upper_bound(I + 1, E, *I, GlobalInitPriorityCmp());
432 
433  LocalCXXGlobalInits.clear();
434  unsigned Priority = I->first.priority;
435  // Compute the function suffix from priority. Prepend with zeroes to make
436  // sure the function names are also ordered as priorities.
437  std::string PrioritySuffix = llvm::utostr(Priority);
438  // Priority is always <= 65535 (enforced by sema).
439  PrioritySuffix = std::string(6-PrioritySuffix.size(), '0')+PrioritySuffix;
440  llvm::Function *Fn = CreateGlobalInitOrDestructFunction(
441  FTy, "_GLOBAL__I_" + PrioritySuffix, FI);
442 
443  for (; I < PrioE; ++I)
444  LocalCXXGlobalInits.push_back(I->second);
445 
446  CodeGenFunction(*this).GenerateCXXGlobalInitFunc(Fn, LocalCXXGlobalInits);
447  AddGlobalCtor(Fn, Priority);
448  }
449  PrioritizedCXXGlobalInits.clear();
450  }
451 
453  SourceManager &SM = Context.getSourceManager();
454  if (const FileEntry *MainFile = SM.getFileEntryForID(SM.getMainFileID())) {
455  // Include the filename in the symbol name. Including "sub_" matches gcc and
456  // makes sure these symbols appear lexicographically behind the symbols with
457  // priority emitted above.
458  FileName = llvm::sys::path::filename(MainFile->getName());
459  } else {
460  FileName = "<null>";
461  }
462 
463  for (size_t i = 0; i < FileName.size(); ++i) {
464  // Replace everything that's not [a-zA-Z0-9._] with a _. This set happens
465  // to be the set of C preprocessing numbers.
466  if (!isPreprocessingNumberBody(FileName[i]))
467  FileName[i] = '_';
468  }
469 
470  llvm::Function *Fn = CreateGlobalInitOrDestructFunction(
471  FTy, llvm::Twine("_GLOBAL__sub_I_", FileName), FI);
472 
473  CodeGenFunction(*this).GenerateCXXGlobalInitFunc(Fn, CXXGlobalInits);
474  AddGlobalCtor(Fn);
475 
476  CXXGlobalInits.clear();
477 }
478 
479 void CodeGenModule::EmitCXXGlobalDtorFunc() {
480  if (CXXGlobalDtors.empty())
481  return;
482 
483  llvm::FunctionType *FTy = llvm::FunctionType::get(VoidTy, false);
484 
485  // Create our global destructor function.
487  llvm::Function *Fn =
488  CreateGlobalInitOrDestructFunction(FTy, "_GLOBAL__D_a", FI);
489 
490  CodeGenFunction(*this).GenerateCXXGlobalDtorsFunc(Fn, CXXGlobalDtors);
491  AddGlobalDtor(Fn);
492 }
493 
494 /// Emit the code necessary to initialize the given global variable.
496  const VarDecl *D,
497  llvm::GlobalVariable *Addr,
498  bool PerformInit) {
499  // Check if we need to emit debug info for variable initializer.
500  if (D->hasAttr<NoDebugAttr>())
501  DebugInfo = nullptr; // disable debug info indefinitely for this function
502 
503  CurEHLocation = D->getLocStart();
504 
506  getTypes().arrangeNullaryFunction(),
508  D->getInit()->getExprLoc());
509 
510  // Use guarded initialization if the global variable is weak. This
511  // occurs for, e.g., instantiated static data members and
512  // definitions explicitly marked weak.
513  if (Addr->hasWeakLinkage() || Addr->hasLinkOnceLinkage()) {
514  EmitCXXGuardedInit(*D, Addr, PerformInit);
515  } else {
516  EmitCXXGlobalVarDeclInit(*D, Addr, PerformInit);
517  }
518 
519  FinishFunction();
520 }
521 
522 void
525  Address Guard) {
526  {
527  auto NL = ApplyDebugLocation::CreateEmpty(*this);
529  getTypes().arrangeNullaryFunction(), FunctionArgList());
530  // Emit an artificial location for this function.
531  auto AL = ApplyDebugLocation::CreateArtificial(*this);
532 
533  llvm::BasicBlock *ExitBlock = nullptr;
534  if (Guard.isValid()) {
535  // If we have a guard variable, check whether we've already performed
536  // these initializations. This happens for TLS initialization functions.
537  llvm::Value *GuardVal = Builder.CreateLoad(Guard);
538  llvm::Value *Uninit = Builder.CreateIsNull(GuardVal,
539  "guard.uninitialized");
540  llvm::BasicBlock *InitBlock = createBasicBlock("init");
541  ExitBlock = createBasicBlock("exit");
542  Builder.CreateCondBr(Uninit, InitBlock, ExitBlock);
543  EmitBlock(InitBlock);
544  // Mark as initialized before initializing anything else. If the
545  // initializers use previously-initialized thread_local vars, that's
546  // probably supposed to be OK, but the standard doesn't say.
547  Builder.CreateStore(llvm::ConstantInt::get(GuardVal->getType(),1), Guard);
548  }
549 
550  RunCleanupsScope Scope(*this);
551 
552  // When building in Objective-C++ ARC mode, create an autorelease pool
553  // around the global initializers.
554  if (getLangOpts().ObjCAutoRefCount && getLangOpts().CPlusPlus) {
557  }
558 
559  for (unsigned i = 0, e = Decls.size(); i != e; ++i)
560  if (Decls[i])
561  EmitRuntimeCall(Decls[i]);
562 
563  Scope.ForceCleanup();
564 
565  if (ExitBlock) {
566  Builder.CreateBr(ExitBlock);
567  EmitBlock(ExitBlock);
568  }
569  }
570 
571  FinishFunction();
572 }
573 
575  llvm::Function *Fn,
576  const std::vector<std::pair<llvm::WeakTrackingVH, llvm::Constant *>>
577  &DtorsAndObjects) {
578  {
579  auto NL = ApplyDebugLocation::CreateEmpty(*this);
581  getTypes().arrangeNullaryFunction(), FunctionArgList());
582  // Emit an artificial location for this function.
583  auto AL = ApplyDebugLocation::CreateArtificial(*this);
584 
585  // Emit the dtors, in reverse order from construction.
586  for (unsigned i = 0, e = DtorsAndObjects.size(); i != e; ++i) {
587  llvm::Value *Callee = DtorsAndObjects[e - i - 1].first;
588  llvm::CallInst *CI = Builder.CreateCall(Callee,
589  DtorsAndObjects[e - i - 1].second);
590  // Make sure the call and the callee agree on calling convention.
591  if (llvm::Function *F = dyn_cast<llvm::Function>(Callee))
592  CI->setCallingConv(F->getCallingConv());
593  }
594  }
595 
596  FinishFunction();
597 }
598 
599 /// generateDestroyHelper - Generates a helper function which, when
600 /// invoked, destroys the given object. The address of the object
601 /// should be in global memory.
603  Address addr, QualType type, Destroyer *destroyer,
604  bool useEHCleanupForArray, const VarDecl *VD) {
605  FunctionArgList args;
608  args.push_back(&Dst);
609 
610  const CGFunctionInfo &FI =
612  llvm::FunctionType *FTy = CGM.getTypes().GetFunctionType(FI);
613  llvm::Function *fn = CGM.CreateGlobalInitOrDestructFunction(
614  FTy, "__cxx_global_array_dtor", FI, VD->getLocation());
615 
616  CurEHLocation = VD->getLocStart();
617 
618  StartFunction(VD, getContext().VoidTy, fn, FI, args);
619 
620  emitDestroy(addr, type, destroyer, useEHCleanupForArray);
621 
622  FinishFunction();
623 
624  return fn;
625 }
const CGFunctionInfo & arrangeBuiltinFunctionDeclaration(QualType resultType, const FunctionArgList &args)
A builtin function is a freestanding function using the default C conventions.
Definition: CGCall.cpp:636
llvm::IntegerType * IntTy
int
void GenerateCXXGlobalInitFunc(llvm::Function *Fn, ArrayRef< llvm::Function * > CXXThreadLocals, Address Guard=Address::invalid())
GenerateCXXGlobalInitFunc - Generates code for initializing global variables.
Definition: CGDeclCXX.cpp:523
Parameter for captured context.
Definition: Decl.h:1395
TemplateSpecializationKind getTemplateSpecializationKind() const
If this variable is an instantiation of a variable template or a static data member of a class templa...
Definition: Decl.cpp:2363
Destroyer * getDestroyer(QualType::DestructionKind destructionKind)
Definition: CGDecl.cpp:1451
A (possibly-)qualified type.
Definition: Type.h:616
bool hasTrivialDestructor() const
Determine whether this class has a trivial destructor (C++ [class.dtor]p3)
Definition: DeclCXX.h:1350
DestructionKind isDestructedType() const
Returns a nonzero value if objects of this type require non-trivial work to clean up after...
Definition: Type.h:1054
llvm::Module & getModule() const
static AggValueSlot forLValue(const LValue &LV, IsDestructed_t isDestructed, NeedsGCBarriers_t needsGC, IsAliased_t isAliased, IsZeroed_t isZeroed=IsNotZeroed)
Definition: CGValue.h:539
QuantityType getQuantity() const
getQuantity - Get the raw integer representation of this quantity.
Definition: CharUnits.h:179
llvm::CallingConv::ID getRuntimeCC() const
void EmitComplexExprIntoLValue(const Expr *E, LValue dest, bool isInit)
EmitComplexExprIntoLValue - Emit the given expression of complex type and place its result into the s...
const Expr * getInit() const
Definition: Decl.h:1146
void ForceCleanup(std::initializer_list< llvm::Value ** > ValuesToReload={})
Force the emission of cleanups now, instead of waiting until this object is destroyed.
const LangOptions & getLangOpts() const
void GenerateCXXGlobalDtorsFunc(llvm::Function *Fn, const std::vector< std::pair< llvm::WeakTrackingVH, llvm::Constant * >> &DtorsAndObjects)
GenerateCXXGlobalDtorsFunc - Generates code for destroying global variables.
Definition: CGDeclCXX.cpp:574
VarDecl - An instance of this class is created to represent a variable declaration or definition...
Definition: Decl.h:758
TLSKind getTLSKind() const
Definition: Decl.cpp:1876
llvm::Value * EmitObjCAutoreleasePoolPush()
Produce the code to do a objc_autoreleasepool_push.
Definition: CGObjC.cpp:2332
bool hasGlobalStorage() const
Returns true for all variables that do not have local storage.
Definition: Decl.h:1005
virtual bool canCallMismatchedFunctionType() const
Returns true if the target allows calling a function through a pointer with a different signature tha...
Definition: CGCXXABI.h:118
llvm::Type * ConvertTypeForMem(QualType T)
ConvertTypeForMem - Convert type T into a llvm::Type.
llvm::Constant * getPointer() const
Definition: Address.h:84
static LLVM_READONLY bool isPreprocessingNumberBody(unsigned char c)
Return true if this is the body character of a C preprocessing number, which is [a-zA-Z0-9_.
Definition: CharInfo.h:148
static void EmitDeclDestroy(CodeGenFunction &CGF, const VarDecl &D, ConstantAddress addr)
Emit code to cause the destruction of the given variable with static storage duration.
Definition: CGDeclCXX.cpp:63
void emitDestroy(Address addr, QualType type, Destroyer *destroyer, bool useEHCleanupForArray)
emitDestroy - Immediately perform the destruction of the given object.
Definition: CGDecl.cpp:1527
bool hasAttr() const
Definition: DeclBase.h:521
CodeGenFunction - This class organizes the per-function state that is used while generating LLVM code...
llvm::Type * ConvertType(QualType T)
ConvertType - Convert type T into a llvm::Type.
RValue EmitReferenceBindingToExpr(const Expr *E)
Emits a reference binding to the passed in expression.
Definition: CGExpr.cpp:531
bool isReferenceType() const
Definition: Type.h:5721
llvm::Constant * getAddrOfCXXStructor(const CXXMethodDecl *MD, StructorType Type, const CGFunctionInfo *FnInfo=nullptr, llvm::FunctionType *FnType=nullptr, bool DontDefer=false, ForDefinition_t IsForDefinition=NotForDefinition)
Return the address of the constructor/destructor of the given type.
Definition: CGCXX.cpp:240
llvm::CallInst * EmitRuntimeCall(llvm::Value *callee, const Twine &name="")
void GenerateCXXGlobalVarDeclInitFunc(llvm::Function *Fn, const VarDecl *D, llvm::GlobalVariable *Addr, bool PerformInit)
Emit the code necessary to initialize the given global variable.
Definition: CGDeclCXX.cpp:495
static ApplyDebugLocation CreateArtificial(CodeGenFunction &CGF)
Apply TemporaryLocation if it is valid.
Definition: CGDebugInfo.h:648
T * getAttr() const
Definition: DeclBase.h:518
CharUnits - This is an opaque type for sizes expressed in character units.
Definition: CharUnits.h:38
bool needsEHCleanup(QualType::DestructionKind kind)
Determines whether an EH cleanup is required to destroy a type with the given destruction kind...
void registerGlobalDtorWithAtExit(const VarDecl &D, llvm::Constant *fn, llvm::Constant *addr)
Call atexit() with a function that passes the given argument to the given function.
Definition: CGDeclCXX.cpp:229
Scope - A scope is a transient data structure that is used while parsing the program.
Definition: Scope.h:39
llvm::BasicBlock * createBasicBlock(const Twine &name="", llvm::Function *parent=nullptr, llvm::BasicBlock *before=nullptr)
createBasicBlock - Create an LLVM basic block.
CharUnits getTypeSizeInChars(QualType T) const
Return the size of the specified (complete) type T, in characters.
bool isValid() const
Definition: Address.h:36
detail::InMemoryDirectory::const_iterator I
QualType getType() const
Definition: Decl.h:589
virtual void EmitThreadLocalInitFuncs(CodeGenModule &CGM, ArrayRef< const VarDecl * > CXXThreadLocals, ArrayRef< llvm::Function * > CXXThreadLocalInits, ArrayRef< const VarDecl * > CXXThreadLocalInitVars)=0
Emits ABI-required functions necessary to initialize thread_local variables in this translation unit...
llvm::Constant * CreateRuntimeFunction(llvm::FunctionType *Ty, StringRef Name, llvm::AttributeList ExtraAttrs=llvm::AttributeList(), bool Local=false)
Create a new runtime function with the specified type and name.
virtual void EmitObjCGlobalAssign(CodeGen::CodeGenFunction &CGF, llvm::Value *src, Address dest, bool threadlocal=false)=0
bool isTypeConstant(QualType QTy, bool ExcludeCtorDtor)
isTypeConstant - Determine whether an object of this type can be emitted as a constant.
const FileEntry * getFileEntryForID(FileID FID) const
Returns the FileEntry record for the provided FileID.
llvm::CallInst * EmitNounwindRuntimeCall(llvm::Value *callee, const Twine &name="")
const TargetInfo & getTarget() const
RValue - This trivial value class is used to represent the result of an expression that is evaluated...
Definition: CGValue.h:38
virtual void mangleDynamicAtExitDestructor(const VarDecl *D, raw_ostream &)=0
void EmitCXXGuardedInit(const VarDecl &D, llvm::GlobalVariable *DeclPtr, bool PerformInit)
Emit code in this function to perform a guarded variable initialization.
Definition: CGDeclCXX.cpp:248
CGObjCRuntime & getObjCRuntime()
Return a reference to the configured Objective-C runtime.
static TypeEvaluationKind getEvaluationKind(QualType T)
hasAggregateLLVMType - Return true if the specified AST type will map into an aggregate LLVM type or ...
llvm::Function * generateDestroyHelper(Address addr, QualType type, Destroyer *destroyer, bool useEHCleanupForArray, const VarDecl *VD)
generateDestroyHelper - Generates a helper function which, when invoked, destroys the given object...
Definition: CGDeclCXX.cpp:602
Expr - This represents one expression.
Definition: Expr.h:105
CGCXXABI & getCXXABI() const
Enters a new scope for capturing cleanups, all of which will be executed once the scope is exited...
const CGFunctionInfo & arrangeNullaryFunction()
A nullary function is a freestanding function of type 'void ()'.
Definition: CGCall.cpp:678
void SetInternalFunctionAttributes(const Decl *D, llvm::Function *F, const CGFunctionInfo &FI)
Set the attributes on the LLVM function for the given decl and function info.
Represents a C++ destructor within a class.
Definition: DeclCXX.h:2551
virtual void mangleDynamicInitializer(const VarDecl *D, raw_ostream &)=0
virtual void EmitGuardedInit(CodeGenFunction &CGF, const VarDecl &D, llvm::GlobalVariable *DeclPtr, bool PerformInit)=0
Emits the guarded initializer and destructor setup for the given variable, given that it couldn't be ...
ASTContext & getContext() const
void EmitStoreOfScalar(llvm::Value *Value, Address Addr, bool Volatile, QualType Ty, LValueBaseInfo BaseInfo=LValueBaseInfo(AlignmentSource::Type), llvm::MDNode *TBAAInfo=nullptr, bool isInit=false, QualType TBAABaseTy=QualType(), uint64_t TBAAOffset=0, bool isNontemporal=false)
EmitStoreOfScalar - Store a scalar value to an address, taking care to appropriately convert from the...
Definition: CGExpr.cpp:1527
virtual void registerGlobalDtor(CodeGenFunction &CGF, const VarDecl &D, llvm::Constant *Dtor, llvm::Constant *Addr)=0
Emit code to force the execution of a destructor during global teardown.
virtual bool HasThisReturn(GlobalDecl GD) const
Returns true if the given constructor or destructor is one of the kinds that the ABI says returns 'th...
Definition: CGCXXABI.h:106
bool isExternallyVisible() const
Definition: Decl.h:338
llvm::Function * getIntrinsic(unsigned IID, ArrayRef< llvm::Type * > Tys=None)
void EmitCXXGlobalVarDeclInit(const VarDecl &D, llvm::Constant *DeclPtr, bool PerformInit)
EmitCXXGlobalVarDeclInit - Create the initializer for a C++ variable with global storage.
Definition: CGDeclCXX.cpp:142
bool isTemplateInstantiation(TemplateSpecializationKind Kind)
Determine whether this template specialization kind refers to an instantiation of an entity (as oppos...
Definition: Specifiers.h:166
const SourceManager & SM
Definition: Format.cpp:1293
GlobalDecl - represents a global declaration.
Definition: GlobalDecl.h:29
The l-value was considered opaque, so the alignment was determined from a type.
StringRef FileName
Definition: Format.cpp:1465
ASTContext & getContext() const
Encodes a location in the source.
const std::string ID
static OMPLinearClause * Create(const ASTContext &C, SourceLocation StartLoc, SourceLocation LParenLoc, OpenMPLinearClauseKind Modifier, SourceLocation ModifierLoc, SourceLocation ColonLoc, SourceLocation EndLoc, ArrayRef< Expr * > VL, ArrayRef< Expr * > PL, ArrayRef< Expr * > IL, Expr *Step, Expr *CalcStep, Stmt *PreInit, Expr *PostUpdate)
Creates clause with a list of variables VL and a linear step Step.
llvm::Constant * createAtExitStub(const VarDecl &VD, llvm::Constant *Dtor, llvm::Constant *Addr)
Create a stub function, suitable for being passed to atexit, which passes the given address to the gi...
Definition: CGDeclCXX.cpp:196
Cached information about one file (either on disk or in the virtual file system). ...
Definition: FileManager.h:59
CanQualType VoidTy
Definition: ASTContext.h:963
const CodeGenOptions & getCodeGenOpts() const
An aligned address.
Definition: Address.h:25
void StartFunction(GlobalDecl GD, QualType RetTy, llvm::Function *Fn, const CGFunctionInfo &FnInfo, const FunctionArgList &Args, SourceLocation Loc=SourceLocation(), SourceLocation StartLoc=SourceLocation())
Emit code for the start of a function.
const LangOptions & getLangOpts() const
MangleContext & getMangleContext()
Gets the mangle context.
Definition: CGCXXABI.h:96
Complete object dtor.
Definition: ABI.h:36
FileID getMainFileID() const
Returns the FileID of the main source file.
void Error(SourceLocation loc, StringRef error)
Emit a general error that something can't be done.
void FinishFunction(SourceLocation EndLoc=SourceLocation())
FinishFunction - Complete IR generation of the current function.
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.
FunctionArgList - Type for representing both the decl and type of parameters to a function...
Definition: CGCall.h:276
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.
StringRef Name
Definition: USRFinder.cpp:123
CXXDestructorDecl * getDestructor() const
Returns the destructor decl for this class.
Definition: DeclCXX.cpp:1437
const internal::VariadicAllOfMatcher< Type > type
Matches Types in the clang AST.
Definition: ASTMatchers.h:2126
llvm::Value * getScalarVal() const
getScalarVal() - Return the Value* of this scalar value.
Definition: CGValue.h:58
llvm::LoadInst * CreateLoad(Address Addr, const llvm::Twine &Name="")
Definition: CGBuilder.h:70
bool isObjCWeak() const
Definition: CGValue.h:307
SourceLocation getLocStart() const LLVM_READONLY
Definition: Decl.h:683
detail::InMemoryDirectory::const_iterator E
llvm::StoreInst * CreateStore(llvm::Value *Val, Address Addr, bool IsVolatile=false)
Definition: CGBuilder.h:108
bool isInSanitizerBlacklist(llvm::Function *Fn, SourceLocation Loc) const
void EmitAggExpr(const Expr *E, AggValueSlot AS)
EmitAggExpr - Emit the computation of the specified expression of aggregate type. ...
Definition: CGExprAgg.cpp:1539
virtual void EmitObjCWeakAssign(CodeGen::CodeGenFunction &CGF, llvm::Value *src, Address dest)=0
void EmitScalarInit(const Expr *init, const ValueDecl *D, LValue lvalue, bool capturedByInit)
Definition: CGDecl.cpp:705
CXXRecordDecl * getAsCXXRecordDecl() const
Retrieves the CXXRecordDecl that this type refers to, either because the type is a RecordType or beca...
Definition: Type.cpp:1548
Internal linkage, which indicates that the entity can be referred to from within the translation unit...
Definition: Linkage.h:33
void EmitBlock(llvm::BasicBlock *BB, bool IsFinished=false)
EmitBlock - Emit the given block.
Definition: CGStmt.cpp:436
static void EmitDeclInit(CodeGenFunction &CGF, const VarDecl &D, ConstantAddress DeclPtr)
Definition: CGDeclCXX.cpp:26
SourceManager & getSourceManager()
Definition: ASTContext.h:616
Represents a C++ struct/union/class.
Definition: DeclCXX.h:267
bool isObjCStrong() const
Definition: CGValue.h:310
llvm::Function * CreateGlobalInitOrDestructFunction(llvm::FunctionType *ty, const Twine &name, const CGFunctionInfo &FI, SourceLocation Loc=SourceLocation(), bool TLS=false)
Definition: CGDeclCXX.cpp:262
A specialization of Address that requires the address to be an LLVM Constant.
Definition: Address.h:75
LValue MakeAddrLValue(Address Addr, QualType T, LValueBaseInfo BaseInfo=LValueBaseInfo(AlignmentSource::Type))
void EmitObjCAutoreleasePoolCleanup(llvm::Value *Ptr)
Definition: CGObjC.cpp:2445
unsigned getTargetAddressSpace(QualType T) const
Definition: ASTContext.h:2321
static ApplyDebugLocation CreateEmpty(CodeGenFunction &CGF)
Set the IRBuilder to not attach debug locations.
Definition: CGDebugInfo.h:665
CodeGenTypes & getTypes() const
SourceLocation getLocation() const
Definition: DeclBase.h:407
LValue - This represents an lvalue references.
Definition: CGValue.h:171
This class handles loading and caching of source files into memory.
static void EmitDeclInvariant(CodeGenFunction &CGF, const VarDecl &D, llvm::Constant *Addr)
Emit code to cause the variable at the given address to be considered as constant from this point onw...
Definition: CGDeclCXX.cpp:122
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.
llvm::FunctionType * GetFunctionType(const CGFunctionInfo &Info)
GetFunctionType - Get the LLVM function type for.
Definition: CGCall.cpp:1519