clang  10.0.0svn
CGDeclCXX.cpp
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1 //===--- CGDeclCXX.cpp - Emit LLVM Code for C++ declarations --------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // This contains code dealing with code generation of C++ declarations
10 //
11 //===----------------------------------------------------------------------===//
12 
13 #include "CodeGenFunction.h"
14 #include "CGCXXABI.h"
15 #include "CGObjCRuntime.h"
16 #include "CGOpenMPRuntime.h"
17 #include "TargetInfo.h"
19 #include "llvm/ADT/StringExtras.h"
20 #include "llvm/IR/Intrinsics.h"
21 #include "llvm/IR/MDBuilder.h"
22 #include "llvm/Support/Path.h"
23 
24 using namespace clang;
25 using namespace CodeGen;
26 
27 static void EmitDeclInit(CodeGenFunction &CGF, const VarDecl &D,
28  ConstantAddress DeclPtr) {
29  assert(
30  (D.hasGlobalStorage() ||
31  (D.hasLocalStorage() && CGF.getContext().getLangOpts().OpenCLCPlusPlus)) &&
32  "VarDecl must have global or local (in the case of OpenCL) storage!");
33  assert(!D.getType()->isReferenceType() &&
34  "Should not call EmitDeclInit on a reference!");
35 
36  QualType type = D.getType();
37  LValue lv = CGF.MakeAddrLValue(DeclPtr, type);
38 
39  const Expr *Init = D.getInit();
40  switch (CGF.getEvaluationKind(type)) {
41  case TEK_Scalar: {
42  CodeGenModule &CGM = CGF.CGM;
43  if (lv.isObjCStrong())
45  DeclPtr, D.getTLSKind());
46  else if (lv.isObjCWeak())
48  DeclPtr);
49  else
50  CGF.EmitScalarInit(Init, &D, lv, false);
51  return;
52  }
53  case TEK_Complex:
54  CGF.EmitComplexExprIntoLValue(Init, lv, /*isInit*/ true);
55  return;
56  case TEK_Aggregate:
61  return;
62  }
63  llvm_unreachable("bad evaluation kind");
64 }
65 
66 /// Emit code to cause the destruction of the given variable with
67 /// static storage duration.
68 static void EmitDeclDestroy(CodeGenFunction &CGF, const VarDecl &D,
69  ConstantAddress Addr) {
70  // Honor __attribute__((no_destroy)) and bail instead of attempting
71  // to emit a reference to a possibly nonexistent destructor, which
72  // in turn can cause a crash. This will result in a global constructor
73  // that isn't balanced out by a destructor call as intended by the
74  // attribute. This also checks for -fno-c++-static-destructors and
75  // bails even if the attribute is not present.
76  if (D.isNoDestroy(CGF.getContext()))
77  return;
78 
79  CodeGenModule &CGM = CGF.CGM;
80 
81  // FIXME: __attribute__((cleanup)) ?
82 
83  QualType Type = D.getType();
85 
86  switch (DtorKind) {
87  case QualType::DK_none:
88  return;
89 
91  break;
92 
96  // We don't care about releasing objects during process teardown.
97  assert(!D.getTLSKind() && "should have rejected this");
98  return;
99  }
100 
101  llvm::FunctionCallee Func;
102  llvm::Constant *Argument;
103 
104  // Special-case non-array C++ destructors, if they have the right signature.
105  // Under some ABIs, destructors return this instead of void, and cannot be
106  // passed directly to __cxa_atexit if the target does not allow this
107  // mismatch.
108  const CXXRecordDecl *Record = Type->getAsCXXRecordDecl();
109  bool CanRegisterDestructor =
110  Record && (!CGM.getCXXABI().HasThisReturn(
111  GlobalDecl(Record->getDestructor(), Dtor_Complete)) ||
113  // If __cxa_atexit is disabled via a flag, a different helper function is
114  // generated elsewhere which uses atexit instead, and it takes the destructor
115  // directly.
116  bool UsingExternalHelper = !CGM.getCodeGenOpts().CXAAtExit;
117  if (Record && (CanRegisterDestructor || UsingExternalHelper)) {
118  assert(!Record->hasTrivialDestructor());
119  CXXDestructorDecl *Dtor = Record->getDestructor();
120 
122  if (CGF.getContext().getLangOpts().OpenCL) {
123  auto DestAS =
125  auto DestTy = CGF.getTypes().ConvertType(Type)->getPointerTo(
126  CGM.getContext().getTargetAddressSpace(DestAS));
127  auto SrcAS = D.getType().getQualifiers().getAddressSpace();
128  if (DestAS == SrcAS)
129  Argument = llvm::ConstantExpr::getBitCast(Addr.getPointer(), DestTy);
130  else
131  // FIXME: On addr space mismatch we are passing NULL. The generation
132  // of the global destructor function should be adjusted accordingly.
133  Argument = llvm::ConstantPointerNull::get(DestTy);
134  } else {
135  Argument = llvm::ConstantExpr::getBitCast(
136  Addr.getPointer(), CGF.getTypes().ConvertType(Type)->getPointerTo());
137  }
138  // Otherwise, the standard logic requires a helper function.
139  } else {
140  Func = CodeGenFunction(CGM)
141  .generateDestroyHelper(Addr, Type, CGF.getDestroyer(DtorKind),
142  CGF.needsEHCleanup(DtorKind), &D);
143  Argument = llvm::Constant::getNullValue(CGF.Int8PtrTy);
144  }
145 
146  CGM.getCXXABI().registerGlobalDtor(CGF, D, Func, Argument);
147 }
148 
149 /// Emit code to cause the variable at the given address to be considered as
150 /// constant from this point onwards.
151 static void EmitDeclInvariant(CodeGenFunction &CGF, const VarDecl &D,
152  llvm::Constant *Addr) {
153  return CGF.EmitInvariantStart(
154  Addr, CGF.getContext().getTypeSizeInChars(D.getType()));
155 }
156 
157 void CodeGenFunction::EmitInvariantStart(llvm::Constant *Addr, CharUnits Size) {
158  // Do not emit the intrinsic if we're not optimizing.
159  if (!CGM.getCodeGenOpts().OptimizationLevel)
160  return;
161 
162  // Grab the llvm.invariant.start intrinsic.
163  llvm::Intrinsic::ID InvStartID = llvm::Intrinsic::invariant_start;
164  // Overloaded address space type.
165  llvm::Type *ObjectPtr[1] = {Int8PtrTy};
166  llvm::Function *InvariantStart = CGM.getIntrinsic(InvStartID, ObjectPtr);
167 
168  // Emit a call with the size in bytes of the object.
169  uint64_t Width = Size.getQuantity();
170  llvm::Value *Args[2] = { llvm::ConstantInt::getSigned(Int64Ty, Width),
171  llvm::ConstantExpr::getBitCast(Addr, Int8PtrTy)};
172  Builder.CreateCall(InvariantStart, Args);
173 }
174 
176  llvm::Constant *DeclPtr,
177  bool PerformInit) {
178 
179  const Expr *Init = D.getInit();
180  QualType T = D.getType();
181 
182  // The address space of a static local variable (DeclPtr) may be different
183  // from the address space of the "this" argument of the constructor. In that
184  // case, we need an addrspacecast before calling the constructor.
185  //
186  // struct StructWithCtor {
187  // __device__ StructWithCtor() {...}
188  // };
189  // __device__ void foo() {
190  // __shared__ StructWithCtor s;
191  // ...
192  // }
193  //
194  // For example, in the above CUDA code, the static local variable s has a
195  // "shared" address space qualifier, but the constructor of StructWithCtor
196  // expects "this" in the "generic" address space.
197  unsigned ExpectedAddrSpace = getContext().getTargetAddressSpace(T);
198  unsigned ActualAddrSpace = DeclPtr->getType()->getPointerAddressSpace();
199  if (ActualAddrSpace != ExpectedAddrSpace) {
201  llvm::PointerType *PTy = llvm::PointerType::get(LTy, ExpectedAddrSpace);
202  DeclPtr = llvm::ConstantExpr::getAddrSpaceCast(DeclPtr, PTy);
203  }
204 
205  ConstantAddress DeclAddr(DeclPtr, getContext().getDeclAlign(&D));
206 
207  if (!T->isReferenceType()) {
208  if (getLangOpts().OpenMP && !getLangOpts().OpenMPSimd &&
209  D.hasAttr<OMPThreadPrivateDeclAttr>()) {
210  (void)CGM.getOpenMPRuntime().emitThreadPrivateVarDefinition(
211  &D, DeclAddr, D.getAttr<OMPThreadPrivateDeclAttr>()->getLocation(),
212  PerformInit, this);
213  }
214  if (PerformInit)
215  EmitDeclInit(*this, D, DeclAddr);
216  if (CGM.isTypeConstant(D.getType(), true))
217  EmitDeclInvariant(*this, D, DeclPtr);
218  else
219  EmitDeclDestroy(*this, D, DeclAddr);
220  return;
221  }
222 
223  assert(PerformInit && "cannot have constant initializer which needs "
224  "destruction for reference");
226  EmitStoreOfScalar(RV.getScalarVal(), DeclAddr, false, T);
227 }
228 
229 /// Create a stub function, suitable for being passed to atexit,
230 /// which passes the given address to the given destructor function.
231 llvm::Function *CodeGenFunction::createAtExitStub(const VarDecl &VD,
232  llvm::FunctionCallee dtor,
233  llvm::Constant *addr) {
234  // Get the destructor function type, void(*)(void).
235  llvm::FunctionType *ty = llvm::FunctionType::get(CGM.VoidTy, false);
236  SmallString<256> FnName;
237  {
238  llvm::raw_svector_ostream Out(FnName);
240  }
241 
243  llvm::Function *fn = CGM.CreateGlobalInitOrDestructFunction(
244  ty, FnName.str(), FI, VD.getLocation());
245 
246  CodeGenFunction CGF(CGM);
247 
249  CGM.getContext().VoidTy, fn, FI, FunctionArgList());
250 
251  llvm::CallInst *call = CGF.Builder.CreateCall(dtor, addr);
252 
253  // Make sure the call and the callee agree on calling convention.
254  if (llvm::Function *dtorFn =
255  dyn_cast<llvm::Function>(dtor.getCallee()->stripPointerCasts()))
256  call->setCallingConv(dtorFn->getCallingConv());
257 
258  CGF.FinishFunction();
259 
260  return fn;
261 }
262 
263 /// Register a global destructor using the C atexit runtime function.
265  llvm::FunctionCallee dtor,
266  llvm::Constant *addr) {
267  // Create a function which calls the destructor.
268  llvm::Constant *dtorStub = createAtExitStub(VD, dtor, addr);
270 }
271 
272 void CodeGenFunction::registerGlobalDtorWithAtExit(llvm::Constant *dtorStub) {
273  // extern "C" int atexit(void (*f)(void));
274  llvm::FunctionType *atexitTy =
275  llvm::FunctionType::get(IntTy, dtorStub->getType(), false);
276 
277  llvm::FunctionCallee atexit =
278  CGM.CreateRuntimeFunction(atexitTy, "atexit", llvm::AttributeList(),
279  /*Local=*/true);
280  if (llvm::Function *atexitFn = dyn_cast<llvm::Function>(atexit.getCallee()))
281  atexitFn->setDoesNotThrow();
282 
283  EmitNounwindRuntimeCall(atexit, dtorStub);
284 }
285 
287  llvm::GlobalVariable *DeclPtr,
288  bool PerformInit) {
289  // If we've been asked to forbid guard variables, emit an error now.
290  // This diagnostic is hard-coded for Darwin's use case; we can find
291  // better phrasing if someone else needs it.
292  if (CGM.getCodeGenOpts().ForbidGuardVariables)
293  CGM.Error(D.getLocation(),
294  "this initialization requires a guard variable, which "
295  "the kernel does not support");
296 
297  CGM.getCXXABI().EmitGuardedInit(*this, D, DeclPtr, PerformInit);
298 }
299 
301  llvm::BasicBlock *InitBlock,
302  llvm::BasicBlock *NoInitBlock,
303  GuardKind Kind,
304  const VarDecl *D) {
305  assert((Kind == GuardKind::TlsGuard || D) && "no guarded variable");
306 
307  // A guess at how many times we will enter the initialization of a
308  // variable, depending on the kind of variable.
309  static const uint64_t InitsPerTLSVar = 1024;
310  static const uint64_t InitsPerLocalVar = 1024 * 1024;
311 
312  llvm::MDNode *Weights;
313  if (Kind == GuardKind::VariableGuard && !D->isLocalVarDecl()) {
314  // For non-local variables, don't apply any weighting for now. Due to our
315  // use of COMDATs, we expect there to be at most one initialization of the
316  // variable per DSO, but we have no way to know how many DSOs will try to
317  // initialize the variable.
318  Weights = nullptr;
319  } else {
320  uint64_t NumInits;
321  // FIXME: For the TLS case, collect and use profiling information to
322  // determine a more accurate brach weight.
323  if (Kind == GuardKind::TlsGuard || D->getTLSKind())
324  NumInits = InitsPerTLSVar;
325  else
326  NumInits = InitsPerLocalVar;
327 
328  // The probability of us entering the initializer is
329  // 1 / (total number of times we attempt to initialize the variable).
330  llvm::MDBuilder MDHelper(CGM.getLLVMContext());
331  Weights = MDHelper.createBranchWeights(1, NumInits - 1);
332  }
333 
334  Builder.CreateCondBr(NeedsInit, InitBlock, NoInitBlock, Weights);
335 }
336 
338  llvm::FunctionType *FTy, const Twine &Name, const CGFunctionInfo &FI,
339  SourceLocation Loc, bool TLS) {
340  llvm::Function *Fn =
342  Name, &getModule());
343  if (!getLangOpts().AppleKext && !TLS) {
344  // Set the section if needed.
345  if (const char *Section = getTarget().getStaticInitSectionSpecifier())
346  Fn->setSection(Section);
347  }
348 
349  SetInternalFunctionAttributes(GlobalDecl(), Fn, FI);
350 
351  Fn->setCallingConv(getRuntimeCC());
352 
353  if (!getLangOpts().Exceptions)
354  Fn->setDoesNotThrow();
355 
356  if (getLangOpts().Sanitize.has(SanitizerKind::Address) &&
357  !isInSanitizerBlacklist(SanitizerKind::Address, Fn, Loc))
358  Fn->addFnAttr(llvm::Attribute::SanitizeAddress);
359 
360  if (getLangOpts().Sanitize.has(SanitizerKind::KernelAddress) &&
361  !isInSanitizerBlacklist(SanitizerKind::KernelAddress, Fn, Loc))
362  Fn->addFnAttr(llvm::Attribute::SanitizeAddress);
363 
364  if (getLangOpts().Sanitize.has(SanitizerKind::HWAddress) &&
365  !isInSanitizerBlacklist(SanitizerKind::HWAddress, Fn, Loc))
366  Fn->addFnAttr(llvm::Attribute::SanitizeHWAddress);
367 
368  if (getLangOpts().Sanitize.has(SanitizerKind::KernelHWAddress) &&
369  !isInSanitizerBlacklist(SanitizerKind::KernelHWAddress, Fn, Loc))
370  Fn->addFnAttr(llvm::Attribute::SanitizeHWAddress);
371 
372  if (getLangOpts().Sanitize.has(SanitizerKind::MemTag) &&
373  !isInSanitizerBlacklist(SanitizerKind::MemTag, Fn, Loc))
374  Fn->addFnAttr(llvm::Attribute::SanitizeMemTag);
375 
376  if (getLangOpts().Sanitize.has(SanitizerKind::Thread) &&
377  !isInSanitizerBlacklist(SanitizerKind::Thread, Fn, Loc))
378  Fn->addFnAttr(llvm::Attribute::SanitizeThread);
379 
380  if (getLangOpts().Sanitize.has(SanitizerKind::Memory) &&
381  !isInSanitizerBlacklist(SanitizerKind::Memory, Fn, Loc))
382  Fn->addFnAttr(llvm::Attribute::SanitizeMemory);
383 
384  if (getLangOpts().Sanitize.has(SanitizerKind::KernelMemory) &&
385  !isInSanitizerBlacklist(SanitizerKind::KernelMemory, Fn, Loc))
386  Fn->addFnAttr(llvm::Attribute::SanitizeMemory);
387 
388  if (getLangOpts().Sanitize.has(SanitizerKind::SafeStack) &&
389  !isInSanitizerBlacklist(SanitizerKind::SafeStack, Fn, Loc))
390  Fn->addFnAttr(llvm::Attribute::SafeStack);
391 
392  if (getLangOpts().Sanitize.has(SanitizerKind::ShadowCallStack) &&
393  !isInSanitizerBlacklist(SanitizerKind::ShadowCallStack, Fn, Loc))
394  Fn->addFnAttr(llvm::Attribute::ShadowCallStack);
395 
396  auto RASignKind = getCodeGenOpts().getSignReturnAddress();
398  Fn->addFnAttr("sign-return-address",
400  ? "all"
401  : "non-leaf");
402  auto RASignKey = getCodeGenOpts().getSignReturnAddressKey();
403  Fn->addFnAttr("sign-return-address-key",
404  RASignKey == CodeGenOptions::SignReturnAddressKeyValue::AKey
405  ? "a_key"
406  : "b_key");
407  }
408 
409  if (getCodeGenOpts().BranchTargetEnforcement)
410  Fn->addFnAttr("branch-target-enforcement");
411 
412  return Fn;
413 }
414 
415 /// Create a global pointer to a function that will initialize a global
416 /// variable. The user has requested that this pointer be emitted in a specific
417 /// section.
418 void CodeGenModule::EmitPointerToInitFunc(const VarDecl *D,
419  llvm::GlobalVariable *GV,
420  llvm::Function *InitFunc,
421  InitSegAttr *ISA) {
422  llvm::GlobalVariable *PtrArray = new llvm::GlobalVariable(
423  TheModule, InitFunc->getType(), /*isConstant=*/true,
424  llvm::GlobalValue::PrivateLinkage, InitFunc, "__cxx_init_fn_ptr");
425  PtrArray->setSection(ISA->getSection());
426  addUsedGlobal(PtrArray);
427 
428  // If the GV is already in a comdat group, then we have to join it.
429  if (llvm::Comdat *C = GV->getComdat())
430  PtrArray->setComdat(C);
431 }
432 
433 void
434 CodeGenModule::EmitCXXGlobalVarDeclInitFunc(const VarDecl *D,
435  llvm::GlobalVariable *Addr,
436  bool PerformInit) {
437 
438  // According to E.2.3.1 in CUDA-7.5 Programming guide: __device__,
439  // __constant__ and __shared__ variables defined in namespace scope,
440  // that are of class type, cannot have a non-empty constructor. All
441  // the checks have been done in Sema by now. Whatever initializers
442  // are allowed are empty and we just need to ignore them here.
443  if (getLangOpts().CUDA && getLangOpts().CUDAIsDevice &&
444  (D->hasAttr<CUDADeviceAttr>() || D->hasAttr<CUDAConstantAttr>() ||
445  D->hasAttr<CUDASharedAttr>()))
446  return;
447 
448  if (getLangOpts().OpenMP &&
449  getOpenMPRuntime().emitDeclareTargetVarDefinition(D, Addr, PerformInit))
450  return;
451 
452  // Check if we've already initialized this decl.
453  auto I = DelayedCXXInitPosition.find(D);
454  if (I != DelayedCXXInitPosition.end() && I->second == ~0U)
455  return;
456 
457  llvm::FunctionType *FTy = llvm::FunctionType::get(VoidTy, false);
458  SmallString<256> FnName;
459  {
460  llvm::raw_svector_ostream Out(FnName);
461  getCXXABI().getMangleContext().mangleDynamicInitializer(D, Out);
462  }
463 
464  // Create a variable initialization function.
465  llvm::Function *Fn =
466  CreateGlobalInitOrDestructFunction(FTy, FnName.str(),
468  D->getLocation());
469 
470  auto *ISA = D->getAttr<InitSegAttr>();
472  PerformInit);
473 
474  llvm::GlobalVariable *COMDATKey =
475  supportsCOMDAT() && D->isExternallyVisible() ? Addr : nullptr;
476 
477  if (D->getTLSKind()) {
478  // FIXME: Should we support init_priority for thread_local?
479  // FIXME: We only need to register one __cxa_thread_atexit function for the
480  // entire TU.
481  CXXThreadLocalInits.push_back(Fn);
482  CXXThreadLocalInitVars.push_back(D);
483  } else if (PerformInit && ISA) {
484  EmitPointerToInitFunc(D, Addr, Fn, ISA);
485  } else if (auto *IPA = D->getAttr<InitPriorityAttr>()) {
486  OrderGlobalInits Key(IPA->getPriority(), PrioritizedCXXGlobalInits.size());
487  PrioritizedCXXGlobalInits.push_back(std::make_pair(Key, Fn));
490  // C++ [basic.start.init]p2:
491  // Definitions of explicitly specialized class template static data
492  // members have ordered initialization. Other class template static data
493  // members (i.e., implicitly or explicitly instantiated specializations)
494  // have unordered initialization.
495  //
496  // As a consequence, we can put them into their own llvm.global_ctors entry.
497  //
498  // If the global is externally visible, put the initializer into a COMDAT
499  // group with the global being initialized. On most platforms, this is a
500  // minor startup time optimization. In the MS C++ ABI, there are no guard
501  // variables, so this COMDAT key is required for correctness.
502  AddGlobalCtor(Fn, 65535, COMDATKey);
503  if (getTarget().getCXXABI().isMicrosoft() && COMDATKey) {
504  // In The MS C++, MS add template static data member in the linker
505  // drective.
506  addUsedGlobal(COMDATKey);
507  }
508  } else if (D->hasAttr<SelectAnyAttr>()) {
509  // SelectAny globals will be comdat-folded. Put the initializer into a
510  // COMDAT group associated with the global, so the initializers get folded
511  // too.
512  AddGlobalCtor(Fn, 65535, COMDATKey);
513  } else {
514  I = DelayedCXXInitPosition.find(D); // Re-do lookup in case of re-hash.
515  if (I == DelayedCXXInitPosition.end()) {
516  CXXGlobalInits.push_back(Fn);
517  } else if (I->second != ~0U) {
518  assert(I->second < CXXGlobalInits.size() &&
519  CXXGlobalInits[I->second] == nullptr);
520  CXXGlobalInits[I->second] = Fn;
521  }
522  }
523 
524  // Remember that we already emitted the initializer for this global.
525  DelayedCXXInitPosition[D] = ~0U;
526 }
527 
528 void CodeGenModule::EmitCXXThreadLocalInitFunc() {
529  getCXXABI().EmitThreadLocalInitFuncs(
530  *this, CXXThreadLocals, CXXThreadLocalInits, CXXThreadLocalInitVars);
531 
532  CXXThreadLocalInits.clear();
533  CXXThreadLocalInitVars.clear();
534  CXXThreadLocals.clear();
535 }
536 
537 void
538 CodeGenModule::EmitCXXGlobalInitFunc() {
539  while (!CXXGlobalInits.empty() && !CXXGlobalInits.back())
540  CXXGlobalInits.pop_back();
541 
542  if (CXXGlobalInits.empty() && PrioritizedCXXGlobalInits.empty())
543  return;
544 
545  llvm::FunctionType *FTy = llvm::FunctionType::get(VoidTy, false);
547 
548  // Create our global initialization function.
549  if (!PrioritizedCXXGlobalInits.empty()) {
550  SmallVector<llvm::Function *, 8> LocalCXXGlobalInits;
551  llvm::array_pod_sort(PrioritizedCXXGlobalInits.begin(),
552  PrioritizedCXXGlobalInits.end());
553  // Iterate over "chunks" of ctors with same priority and emit each chunk
554  // into separate function. Note - everything is sorted first by priority,
555  // second - by lex order, so we emit ctor functions in proper order.
557  I = PrioritizedCXXGlobalInits.begin(),
558  E = PrioritizedCXXGlobalInits.end(); I != E; ) {
560  PrioE = std::upper_bound(I + 1, E, *I, GlobalInitPriorityCmp());
561 
562  LocalCXXGlobalInits.clear();
563  unsigned Priority = I->first.priority;
564  // Compute the function suffix from priority. Prepend with zeroes to make
565  // sure the function names are also ordered as priorities.
566  std::string PrioritySuffix = llvm::utostr(Priority);
567  // Priority is always <= 65535 (enforced by sema).
568  PrioritySuffix = std::string(6-PrioritySuffix.size(), '0')+PrioritySuffix;
569  llvm::Function *Fn = CreateGlobalInitOrDestructFunction(
570  FTy, "_GLOBAL__I_" + PrioritySuffix, FI);
571 
572  for (; I < PrioE; ++I)
573  LocalCXXGlobalInits.push_back(I->second);
574 
575  CodeGenFunction(*this).GenerateCXXGlobalInitFunc(Fn, LocalCXXGlobalInits);
576  AddGlobalCtor(Fn, Priority);
577  }
578  PrioritizedCXXGlobalInits.clear();
579  }
580 
581  // Include the filename in the symbol name. Including "sub_" matches gcc and
582  // makes sure these symbols appear lexicographically behind the symbols with
583  // priority emitted above.
584  SmallString<128> FileName = llvm::sys::path::filename(getModule().getName());
585  if (FileName.empty())
586  FileName = "<null>";
587 
588  for (size_t i = 0; i < FileName.size(); ++i) {
589  // Replace everything that's not [a-zA-Z0-9._] with a _. This set happens
590  // to be the set of C preprocessing numbers.
591  if (!isPreprocessingNumberBody(FileName[i]))
592  FileName[i] = '_';
593  }
594 
595  llvm::Function *Fn = CreateGlobalInitOrDestructFunction(
596  FTy, llvm::Twine("_GLOBAL__sub_I_", FileName), FI);
597 
598  CodeGenFunction(*this).GenerateCXXGlobalInitFunc(Fn, CXXGlobalInits);
599  AddGlobalCtor(Fn);
600 
601  // In OpenCL global init functions must be converted to kernels in order to
602  // be able to launch them from the host.
603  // FIXME: Some more work might be needed to handle destructors correctly.
604  // Current initialization function makes use of function pointers callbacks.
605  // We can't support function pointers especially between host and device.
606  // However it seems global destruction has little meaning without any
607  // dynamic resource allocation on the device and program scope variables are
608  // destroyed by the runtime when program is released.
609  if (getLangOpts().OpenCL) {
610  GenOpenCLArgMetadata(Fn);
611  Fn->setCallingConv(llvm::CallingConv::SPIR_KERNEL);
612  }
613 
614  CXXGlobalInits.clear();
615 }
616 
617 void CodeGenModule::EmitCXXGlobalDtorFunc() {
618  if (CXXGlobalDtors.empty())
619  return;
620 
621  llvm::FunctionType *FTy = llvm::FunctionType::get(VoidTy, false);
622 
623  // Create our global destructor function.
625  llvm::Function *Fn =
626  CreateGlobalInitOrDestructFunction(FTy, "_GLOBAL__D_a", FI);
627 
628  CodeGenFunction(*this).GenerateCXXGlobalDtorsFunc(Fn, CXXGlobalDtors);
629  AddGlobalDtor(Fn);
630 }
631 
632 /// Emit the code necessary to initialize the given global variable.
634  const VarDecl *D,
635  llvm::GlobalVariable *Addr,
636  bool PerformInit) {
637  // Check if we need to emit debug info for variable initializer.
638  if (D->hasAttr<NoDebugAttr>())
639  DebugInfo = nullptr; // disable debug info indefinitely for this function
640 
641  CurEHLocation = D->getBeginLoc();
642 
644  getContext().VoidTy, Fn, getTypes().arrangeNullaryFunction(),
646  D->getInit()->getExprLoc());
647 
648  // Use guarded initialization if the global variable is weak. This
649  // occurs for, e.g., instantiated static data members and
650  // definitions explicitly marked weak.
651  //
652  // Also use guarded initialization for a variable with dynamic TLS and
653  // unordered initialization. (If the initialization is ordered, the ABI
654  // layer will guard the whole-TU initialization for us.)
655  if (Addr->hasWeakLinkage() || Addr->hasLinkOnceLinkage() ||
656  (D->getTLSKind() == VarDecl::TLS_Dynamic &&
658  EmitCXXGuardedInit(*D, Addr, PerformInit);
659  } else {
660  EmitCXXGlobalVarDeclInit(*D, Addr, PerformInit);
661  }
662 
663  FinishFunction();
664 }
665 
666 void
669  ConstantAddress Guard) {
670  {
671  auto NL = ApplyDebugLocation::CreateEmpty(*this);
673  getTypes().arrangeNullaryFunction(), FunctionArgList());
674  // Emit an artificial location for this function.
675  auto AL = ApplyDebugLocation::CreateArtificial(*this);
676 
677  llvm::BasicBlock *ExitBlock = nullptr;
678  if (Guard.isValid()) {
679  // If we have a guard variable, check whether we've already performed
680  // these initializations. This happens for TLS initialization functions.
681  llvm::Value *GuardVal = Builder.CreateLoad(Guard);
682  llvm::Value *Uninit = Builder.CreateIsNull(GuardVal,
683  "guard.uninitialized");
684  llvm::BasicBlock *InitBlock = createBasicBlock("init");
685  ExitBlock = createBasicBlock("exit");
686  EmitCXXGuardedInitBranch(Uninit, InitBlock, ExitBlock,
687  GuardKind::TlsGuard, nullptr);
688  EmitBlock(InitBlock);
689  // Mark as initialized before initializing anything else. If the
690  // initializers use previously-initialized thread_local vars, that's
691  // probably supposed to be OK, but the standard doesn't say.
692  Builder.CreateStore(llvm::ConstantInt::get(GuardVal->getType(),1), Guard);
693 
694  // The guard variable can't ever change again.
696  Guard.getPointer(),
698  CGM.getDataLayout().getTypeAllocSize(GuardVal->getType())));
699  }
700 
701  RunCleanupsScope Scope(*this);
702 
703  // When building in Objective-C++ ARC mode, create an autorelease pool
704  // around the global initializers.
705  if (getLangOpts().ObjCAutoRefCount && getLangOpts().CPlusPlus) {
708  }
709 
710  for (unsigned i = 0, e = Decls.size(); i != e; ++i)
711  if (Decls[i])
712  EmitRuntimeCall(Decls[i]);
713 
714  Scope.ForceCleanup();
715 
716  if (ExitBlock) {
717  Builder.CreateBr(ExitBlock);
718  EmitBlock(ExitBlock);
719  }
720  }
721 
722  FinishFunction();
723 }
724 
726  llvm::Function *Fn,
727  const std::vector<std::tuple<llvm::FunctionType *, llvm::WeakTrackingVH,
728  llvm::Constant *>> &DtorsAndObjects) {
729  {
730  auto NL = ApplyDebugLocation::CreateEmpty(*this);
732  getTypes().arrangeNullaryFunction(), FunctionArgList());
733  // Emit an artificial location for this function.
734  auto AL = ApplyDebugLocation::CreateArtificial(*this);
735 
736  // Emit the dtors, in reverse order from construction.
737  for (unsigned i = 0, e = DtorsAndObjects.size(); i != e; ++i) {
738  llvm::FunctionType *CalleeTy;
739  llvm::Value *Callee;
740  llvm::Constant *Arg;
741  std::tie(CalleeTy, Callee, Arg) = DtorsAndObjects[e - i - 1];
742  llvm::CallInst *CI = Builder.CreateCall(CalleeTy, Callee, Arg);
743  // Make sure the call and the callee agree on calling convention.
744  if (llvm::Function *F = dyn_cast<llvm::Function>(Callee))
745  CI->setCallingConv(F->getCallingConv());
746  }
747  }
748 
749  FinishFunction();
750 }
751 
752 /// generateDestroyHelper - Generates a helper function which, when
753 /// invoked, destroys the given object. The address of the object
754 /// should be in global memory.
756  Address addr, QualType type, Destroyer *destroyer,
757  bool useEHCleanupForArray, const VarDecl *VD) {
758  FunctionArgList args;
761  args.push_back(&Dst);
762 
763  const CGFunctionInfo &FI =
765  llvm::FunctionType *FTy = CGM.getTypes().GetFunctionType(FI);
766  llvm::Function *fn = CGM.CreateGlobalInitOrDestructFunction(
767  FTy, "__cxx_global_array_dtor", FI, VD->getLocation());
768 
769  CurEHLocation = VD->getBeginLoc();
770 
771  StartFunction(VD, getContext().VoidTy, fn, FI, args);
772 
773  emitDestroy(addr, type, destroyer, useEHCleanupForArray);
774 
775  FinishFunction();
776 
777  return fn;
778 }
const CGFunctionInfo & arrangeBuiltinFunctionDeclaration(QualType resultType, const FunctionArgList &args)
A builtin function is a freestanding function using the default C conventions.
Definition: CGCall.cpp:652
const llvm::DataLayout & getDataLayout() const
void EmitCXXGuardedInitBranch(llvm::Value *NeedsInit, llvm::BasicBlock *InitBlock, llvm::BasicBlock *NoInitBlock, GuardKind Kind, const VarDecl *D)
Emit a branch to select whether or not to perform guarded initialization.
Definition: CGDeclCXX.cpp:300
llvm::IntegerType * IntTy
int
Other implicit parameter.
Definition: Decl.h:1524
Destroyer * getDestroyer(QualType::DestructionKind destructionKind)
Definition: CGDecl.cpp:2032
A (possibly-)qualified type.
Definition: Type.h:643
const CodeGenOptions & getCodeGenOpts() const
llvm::LLVMContext & getLLVMContext()
The base class of the type hierarchy.
Definition: Type.h:1418
void EmitComplexExprIntoLValue(const Expr *E, LValue dest, bool isInit)
EmitComplexExprIntoLValue - Emit the given expression of complex type and place its result into the s...
Represents a variable declaration or definition.
Definition: Decl.h:812
llvm::Value * EmitObjCAutoreleasePoolPush()
Produce the code to do a objc_autoreleasepool_push.
Definition: CGObjC.cpp:2484
llvm::Type * ConvertTypeForMem(QualType T)
ConvertTypeForMem - Convert type T into a llvm::Type.
std::string getName(ArrayRef< StringRef > Parts) const
Get the platform-specific name separator.
const TargetInfo & getTarget() const
void emitDestroy(Address addr, QualType type, Destroyer *destroyer, bool useEHCleanupForArray)
emitDestroy - Immediately perform the destruction of the given object.
Definition: CGDecl.cpp:2107
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:593
bool isReferenceType() const
Definition: Type.h:6366
void registerGlobalDtorWithAtExit(const VarDecl &D, llvm::FunctionCallee fn, llvm::Constant *addr)
Call atexit() with a function that passes the given argument to the given function.
Definition: CGDeclCXX.cpp:264
SourceLocation getBeginLoc() const LLVM_READONLY
Definition: Decl.h:738
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:633
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...
static ApplyDebugLocation CreateArtificial(CodeGenFunction &CGF)
Apply TemporaryLocation if it is valid.
Definition: CGDebugInfo.h:742
CharUnits - This is an opaque type for sizes expressed in character units.
Definition: CharUnits.h:37
llvm::CallInst * EmitRuntimeCall(llvm::FunctionCallee callee, const Twine &name="")
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:2505
bool needsEHCleanup(QualType::DestructionKind kind)
Determines whether an EH cleanup is required to destroy a type with the given destruction kind...
LangAS getAddressSpace() const
Definition: Type.h:353
bool isObjCWeak() const
Definition: CGValue.h:293
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.
bool hasTrivialDestructor() const
Determine whether this class has a trivial destructor (C++ [class.dtor]p3)
Definition: DeclCXX.h:1491
CXXDestructorDecl * getDestructor() const
Returns the destructor decl for this class.
Definition: DeclCXX.cpp:1735
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
constexpr XRayInstrMask All
Definition: XRayInstr.h:41
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.
bool hasAttr() const
Definition: DeclBase.h:542
bool isValid() const
Definition: Address.h:35
CXXRecordDecl * getAsCXXRecordDecl() const
Retrieves the CXXRecordDecl that this type refers to, either because the type is a RecordType or beca...
Definition: Type.cpp:1636
const TargetCodeGenInfo & getTargetCodeGenInfo()
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
QuantityType getQuantity() const
getQuantity - Get the raw integer representation of this quantity.
Definition: CharUnits.h:178
virtual bool HasThisReturn(GlobalDecl GD) const
Returns true if the given constructor or destructor is one of the kinds that the ABI says returns &#39;th...
Definition: CGCXXABI.h:106
llvm::CallingConv::ID getRuntimeCC() const
void EmitCXXGuardedInit(const VarDecl &D, llvm::GlobalVariable *DeclPtr, bool PerformInit)
Emit code in this function to perform a guarded variable initialization.
Definition: CGDeclCXX.cpp:286
CGObjCRuntime & getObjCRuntime()
Return a reference to the configured Objective-C runtime.
static TypeEvaluationKind getEvaluationKind(QualType T)
getEvaluationKind - Return the TypeEvaluationKind of QualType T.
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:755
This represents one expression.
Definition: Expr.h:108
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...
const CGFunctionInfo & arrangeNullaryFunction()
A nullary function is a freestanding function of type &#39;void ()&#39;.
Definition: CGCall.cpp:694
Represents a C++ destructor within a class.
Definition: DeclCXX.h:2838
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&#39;t be ...
void EmitInvariantStart(llvm::Constant *Addr, CharUnits Size)
Definition: CGDeclCXX.cpp:157
TLSKind getTLSKind() const
Definition: Decl.cpp:1970
static CharUnits fromQuantity(QuantityType Quantity)
fromQuantity - Construct a CharUnits quantity from a raw integer type.
Definition: CharUnits.h:62
void GenerateCXXGlobalInitFunc(llvm::Function *Fn, ArrayRef< llvm::Function *> CXXThreadLocals, ConstantAddress Guard=ConstantAddress::invalid())
GenerateCXXGlobalInitFunc - Generates code for initializing global variables.
Definition: CGDeclCXX.cpp:667
void EmitCXXGlobalVarDeclInit(const VarDecl &D, llvm::Constant *DeclPtr, bool PerformInit)
EmitCXXGlobalVarDeclInit - Create the initializer for a C++ variable with global storage.
Definition: CGDeclCXX.cpp:175
bool isObjCStrong() const
Definition: CGValue.h:296
ASTContext & getContext() const
bool isTemplateInstantiation(TemplateSpecializationKind Kind)
Determine whether this template specialization kind refers to an instantiation of an entity (as oppos...
Definition: Specifiers.h:198
GlobalDecl - represents a global declaration.
Definition: GlobalDecl.h:40
The l-value was considered opaque, so the alignment was determined from a type.
Kind
Encodes a location in the source.
bool hasGlobalStorage() const
Returns true for all variables that do not have local storage.
Definition: Decl.h:1077
CanQualType VoidTy
Definition: ASTContext.h:1002
An aligned address.
Definition: Address.h:24
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.
DestructionKind isDestructedType() const
Returns a nonzero value if objects of this type require non-trivial work to clean up after...
Definition: Type.h:1163
MangleContext & getMangleContext()
Gets the mangle context.
Definition: CGCXXABI.h:96
Complete object dtor.
Definition: ABI.h:35
constexpr XRayInstrMask None
Definition: XRayInstr.h:37
void Error(SourceLocation loc, StringRef error)
Emit a general error that something can&#39;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:215
llvm::Value * EmitScalarExpr(const Expr *E, bool IgnoreResultAssign=false)
EmitScalarExpr - Emit the computation of the specified expression of LLVM scalar type, returning the result.
FunctionArgList - Type for representing both the decl and type of parameters to a function...
Definition: CGCall.h:358
llvm::Value * getScalarVal() const
getScalarVal() - Return the Value* of this scalar value.
Definition: CGValue.h:58
TLS with a dynamic initializer.
Definition: Decl.h:835
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.
const Expr * getInit() const
Definition: Decl.h:1219
llvm::Constant * getPointer() const
Definition: Address.h:83
llvm::LoadInst * CreateLoad(Address Addr, const llvm::Twine &Name="")
Definition: CGBuilder.h:69
virtual void registerGlobalDtor(CodeGenFunction &CGF, const VarDecl &D, llvm::FunctionCallee Dtor, llvm::Constant *Addr)=0
Emit code to force the execution of a destructor during global teardown.
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:68
llvm::Function * getIntrinsic(unsigned IID, ArrayRef< llvm::Type *> Tys=None)
llvm::StoreInst * CreateStore(llvm::Value *Val, Address Addr, bool IsVolatile=false)
Definition: CGBuilder.h:107
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:539
LValue MakeAddrLValue(Address Addr, QualType T, AlignmentSource Source=AlignmentSource::Type)
llvm::Function * createAtExitStub(const VarDecl &VD, llvm::FunctionCallee 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:231
void EmitAggExpr(const Expr *E, AggValueSlot AS)
EmitAggExpr - Emit the computation of the specified expression of aggregate type. ...
Definition: CGExprAgg.cpp:1848
GVALinkage GetGVALinkageForVariable(const VarDecl *VD)
virtual void EmitObjCWeakAssign(CodeGen::CodeGenFunction &CGF, llvm::Value *src, Address dest)=0
virtual bool emitDeclareTargetVarDefinition(const VarDecl *VD, llvm::GlobalVariable *Addr, bool PerformInit)
Emit a code for initialization of declare target variable.
CodeGenTypes & getTypes() const
T * getAttr() const
Definition: DeclBase.h:538
void EmitScalarInit(const Expr *init, const ValueDecl *D, LValue lvalue, bool capturedByInit)
Definition: CGDecl.cpp:746
Internal linkage, which indicates that the entity can be referred to from within the translation unit...
Definition: Linkage.h:31
llvm::FunctionCallee CreateRuntimeFunction(llvm::FunctionType *Ty, StringRef Name, llvm::AttributeList ExtraAttrs=llvm::AttributeList(), bool Local=false)
Create or return a runtime function declaration with the specified type and name. ...
void EmitBlock(llvm::BasicBlock *BB, bool IsFinished=false)
EmitBlock - Emit the given block.
Definition: CGStmt.cpp:454
static void EmitDeclInit(CodeGenFunction &CGF, const VarDecl &D, ConstantAddress DeclPtr)
Definition: CGDeclCXX.cpp:27
llvm::FunctionCallee getAddrAndTypeOfCXXStructor(GlobalDecl GD, const CGFunctionInfo *FnInfo=nullptr, llvm::FunctionType *FnType=nullptr, bool DontDefer=false, ForDefinition_t IsForDefinition=NotForDefinition)
Definition: CGCXX.cpp:220
Represents a C++ struct/union/class.
Definition: DeclCXX.h:300
llvm::Function * CreateGlobalInitOrDestructFunction(llvm::FunctionType *ty, const Twine &name, const CGFunctionInfo &FI, SourceLocation Loc=SourceLocation(), bool TLS=false)
Definition: CGDeclCXX.cpp:337
Qualifiers getQualifiers() const
Retrieve the set of qualifiers applied to this type.
Definition: Type.h:6157
A specialization of Address that requires the address to be an LLVM Constant.
Definition: Address.h:74
void GenerateCXXGlobalDtorsFunc(llvm::Function *Fn, const std::vector< std::tuple< llvm::FunctionType *, llvm::WeakTrackingVH, llvm::Constant *>> &DtorsAndObjects)
GenerateCXXGlobalDtorsFunc - Generates code for destroying global variables.
Definition: CGDeclCXX.cpp:725
CGCXXABI & getCXXABI() const
virtual LangAS getAddrSpaceOfCxaAtexitPtrParam() const
Get address space of pointer parameter for __cxa_atexit.
Definition: TargetInfo.h:271
void EmitObjCAutoreleasePoolCleanup(llvm::Value *Ptr)
Definition: CGObjC.cpp:2680
CharUnits getTypeSizeInChars(QualType T) const
Return the size of the specified (complete) type T, in characters.
static ApplyDebugLocation CreateEmpty(CodeGenFunction &CGF)
Set the IRBuilder to not attach debug locations.
Definition: CGDebugInfo.h:759
bool isLocalVarDecl() const
Returns true for local variable declarations other than parameters.
Definition: Decl.h:1104
QualType getType() const
Definition: Decl.h:647
LValue - This represents an lvalue references.
Definition: CGValue.h:166
const LangOptions & getLangOpts() const
unsigned getTargetAddressSpace(QualType T) const
Definition: ASTContext.h:2523
llvm::CallInst * EmitNounwindRuntimeCall(llvm::FunctionCallee callee, const Twine &name="")
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:147
const LangOptions & getLangOpts() const
Definition: ASTContext.h:710
SourceLocation getLocation() const
Definition: DeclBase.h:429
bool isExternallyVisible() const
Definition: Decl.h:379
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:151
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.
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.
llvm::FunctionType * GetFunctionType(const CGFunctionInfo &Info)
GetFunctionType - Get the LLVM function type for.
Definition: CGCall.cpp:1541
bool isNoDestroy(const ASTContext &) const
Do we need to emit an exit-time destructor for this variable?
Definition: Decl.cpp:2562