clang  3.8.0
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, where there's a function
90  // with the right signature that we can just call.
91  const CXXRecordDecl *record = nullptr;
92  if (dtorKind == QualType::DK_cxx_destructor &&
93  (record = type->getAsCXXRecordDecl())) {
94  assert(!record->hasTrivialDestructor());
95  CXXDestructorDecl *dtor = record->getDestructor();
96 
97  function = CGM.getAddrOfCXXStructor(dtor, StructorType::Complete);
98  argument = llvm::ConstantExpr::getBitCast(
99  addr.getPointer(), CGF.getTypes().ConvertType(type)->getPointerTo());
100 
101  // Otherwise, the standard logic requires a helper function.
102  } else {
103  function = CodeGenFunction(CGM)
104  .generateDestroyHelper(addr, type, CGF.getDestroyer(dtorKind),
105  CGF.needsEHCleanup(dtorKind), &D);
106  argument = llvm::Constant::getNullValue(CGF.Int8PtrTy);
107  }
108 
109  CGM.getCXXABI().registerGlobalDtor(CGF, D, function, argument);
110 }
111 
112 /// Emit code to cause the variable at the given address to be considered as
113 /// constant from this point onwards.
114 static void EmitDeclInvariant(CodeGenFunction &CGF, const VarDecl &D,
115  llvm::Constant *Addr) {
116  // Don't emit the intrinsic if we're not optimizing.
117  if (!CGF.CGM.getCodeGenOpts().OptimizationLevel)
118  return;
119 
120  // Grab the llvm.invariant.start intrinsic.
121  llvm::Intrinsic::ID InvStartID = llvm::Intrinsic::invariant_start;
122  llvm::Constant *InvariantStart = CGF.CGM.getIntrinsic(InvStartID);
123 
124  // Emit a call with the size in bytes of the object.
125  CharUnits WidthChars = CGF.getContext().getTypeSizeInChars(D.getType());
126  uint64_t Width = WidthChars.getQuantity();
127  llvm::Value *Args[2] = { llvm::ConstantInt::getSigned(CGF.Int64Ty, Width),
128  llvm::ConstantExpr::getBitCast(Addr, CGF.Int8PtrTy)};
129  CGF.Builder.CreateCall(InvariantStart, Args);
130 }
131 
133  llvm::Constant *DeclPtr,
134  bool PerformInit) {
135 
136  const Expr *Init = D.getInit();
137  QualType T = D.getType();
138 
139  // The address space of a static local variable (DeclPtr) may be different
140  // from the address space of the "this" argument of the constructor. In that
141  // case, we need an addrspacecast before calling the constructor.
142  //
143  // struct StructWithCtor {
144  // __device__ StructWithCtor() {...}
145  // };
146  // __device__ void foo() {
147  // __shared__ StructWithCtor s;
148  // ...
149  // }
150  //
151  // For example, in the above CUDA code, the static local variable s has a
152  // "shared" address space qualifier, but the constructor of StructWithCtor
153  // expects "this" in the "generic" address space.
154  unsigned ExpectedAddrSpace = getContext().getTargetAddressSpace(T);
155  unsigned ActualAddrSpace = DeclPtr->getType()->getPointerAddressSpace();
156  if (ActualAddrSpace != ExpectedAddrSpace) {
158  llvm::PointerType *PTy = llvm::PointerType::get(LTy, ExpectedAddrSpace);
159  DeclPtr = llvm::ConstantExpr::getAddrSpaceCast(DeclPtr, PTy);
160  }
161 
162  ConstantAddress DeclAddr(DeclPtr, getContext().getDeclAlign(&D));
163 
164  if (!T->isReferenceType()) {
165  if (getLangOpts().OpenMP && D.hasAttr<OMPThreadPrivateDeclAttr>())
166  (void)CGM.getOpenMPRuntime().emitThreadPrivateVarDefinition(
167  &D, DeclAddr, D.getAttr<OMPThreadPrivateDeclAttr>()->getLocation(),
168  PerformInit, this);
169  if (PerformInit)
170  EmitDeclInit(*this, D, DeclAddr);
171  if (CGM.isTypeConstant(D.getType(), true))
172  EmitDeclInvariant(*this, D, DeclPtr);
173  else
174  EmitDeclDestroy(*this, D, DeclAddr);
175  return;
176  }
177 
178  assert(PerformInit && "cannot have constant initializer which needs "
179  "destruction for reference");
181  EmitStoreOfScalar(RV.getScalarVal(), DeclAddr, false, T);
182 }
183 
184 /// Create a stub function, suitable for being passed to atexit,
185 /// which passes the given address to the given destructor function.
186 llvm::Constant *CodeGenFunction::createAtExitStub(const VarDecl &VD,
187  llvm::Constant *dtor,
188  llvm::Constant *addr) {
189  // Get the destructor function type, void(*)(void).
190  llvm::FunctionType *ty = llvm::FunctionType::get(CGM.VoidTy, false);
191  SmallString<256> FnName;
192  {
193  llvm::raw_svector_ostream Out(FnName);
195  }
196 
198  llvm::Function *fn = CGM.CreateGlobalInitOrDestructFunction(ty, FnName.str(),
199  FI,
200  VD.getLocation());
201 
202  CodeGenFunction CGF(CGM);
203 
204  CGF.StartFunction(&VD, CGM.getContext().VoidTy, fn, FI, FunctionArgList());
205 
206  llvm::CallInst *call = CGF.Builder.CreateCall(dtor, addr);
207 
208  // Make sure the call and the callee agree on calling convention.
209  if (llvm::Function *dtorFn =
210  dyn_cast<llvm::Function>(dtor->stripPointerCasts()))
211  call->setCallingConv(dtorFn->getCallingConv());
212 
213  CGF.FinishFunction();
214 
215  return fn;
216 }
217 
218 /// Register a global destructor using the C atexit runtime function.
220  llvm::Constant *dtor,
221  llvm::Constant *addr) {
222  // Create a function which calls the destructor.
223  llvm::Constant *dtorStub = createAtExitStub(VD, dtor, addr);
224 
225  // extern "C" int atexit(void (*f)(void));
226  llvm::FunctionType *atexitTy =
227  llvm::FunctionType::get(IntTy, dtorStub->getType(), false);
228 
229  llvm::Constant *atexit =
230  CGM.CreateRuntimeFunction(atexitTy, "atexit");
231  if (llvm::Function *atexitFn = dyn_cast<llvm::Function>(atexit))
232  atexitFn->setDoesNotThrow();
233 
234  EmitNounwindRuntimeCall(atexit, dtorStub);
235 }
236 
238  llvm::GlobalVariable *DeclPtr,
239  bool PerformInit) {
240  // If we've been asked to forbid guard variables, emit an error now.
241  // This diagnostic is hard-coded for Darwin's use case; we can find
242  // better phrasing if someone else needs it.
243  if (CGM.getCodeGenOpts().ForbidGuardVariables)
244  CGM.Error(D.getLocation(),
245  "this initialization requires a guard variable, which "
246  "the kernel does not support");
247 
248  CGM.getCXXABI().EmitGuardedInit(*this, D, DeclPtr, PerformInit);
249 }
250 
252  llvm::FunctionType *FTy, const Twine &Name, const CGFunctionInfo &FI,
253  SourceLocation Loc, bool TLS) {
254  llvm::Function *Fn =
256  Name, &getModule());
257  if (!getLangOpts().AppleKext && !TLS) {
258  // Set the section if needed.
259  if (const char *Section = getTarget().getStaticInitSectionSpecifier())
260  Fn->setSection(Section);
261  }
262 
263  SetInternalFunctionAttributes(nullptr, Fn, FI);
264 
265  Fn->setCallingConv(getRuntimeCC());
266 
267  if (!getLangOpts().Exceptions)
268  Fn->setDoesNotThrow();
269 
270  if (!isInSanitizerBlacklist(Fn, Loc)) {
271  if (getLangOpts().Sanitize.hasOneOf(SanitizerKind::Address |
272  SanitizerKind::KernelAddress))
273  Fn->addFnAttr(llvm::Attribute::SanitizeAddress);
274  if (getLangOpts().Sanitize.has(SanitizerKind::Thread))
275  Fn->addFnAttr(llvm::Attribute::SanitizeThread);
276  if (getLangOpts().Sanitize.has(SanitizerKind::Memory))
277  Fn->addFnAttr(llvm::Attribute::SanitizeMemory);
278  if (getLangOpts().Sanitize.has(SanitizerKind::SafeStack))
279  Fn->addFnAttr(llvm::Attribute::SafeStack);
280  }
281 
282  return Fn;
283 }
284 
285 /// Create a global pointer to a function that will initialize a global
286 /// variable. The user has requested that this pointer be emitted in a specific
287 /// section.
288 void CodeGenModule::EmitPointerToInitFunc(const VarDecl *D,
289  llvm::GlobalVariable *GV,
290  llvm::Function *InitFunc,
291  InitSegAttr *ISA) {
292  llvm::GlobalVariable *PtrArray = new llvm::GlobalVariable(
293  TheModule, InitFunc->getType(), /*isConstant=*/true,
294  llvm::GlobalValue::PrivateLinkage, InitFunc, "__cxx_init_fn_ptr");
295  PtrArray->setSection(ISA->getSection());
296  addUsedGlobal(PtrArray);
297 
298  // If the GV is already in a comdat group, then we have to join it.
299  if (llvm::Comdat *C = GV->getComdat())
300  PtrArray->setComdat(C);
301 }
302 
303 void
304 CodeGenModule::EmitCXXGlobalVarDeclInitFunc(const VarDecl *D,
305  llvm::GlobalVariable *Addr,
306  bool PerformInit) {
307  // Check if we've already initialized this decl.
308  auto I = DelayedCXXInitPosition.find(D);
309  if (I != DelayedCXXInitPosition.end() && I->second == ~0U)
310  return;
311 
312  llvm::FunctionType *FTy = llvm::FunctionType::get(VoidTy, false);
313  SmallString<256> FnName;
314  {
315  llvm::raw_svector_ostream Out(FnName);
317  }
318 
319  // Create a variable initialization function.
320  llvm::Function *Fn =
321  CreateGlobalInitOrDestructFunction(FTy, FnName.str(),
323  D->getLocation());
324 
325  auto *ISA = D->getAttr<InitSegAttr>();
327  PerformInit);
328 
329  llvm::GlobalVariable *COMDATKey =
330  supportsCOMDAT() && D->isExternallyVisible() ? Addr : nullptr;
331 
332  if (D->getTLSKind()) {
333  // FIXME: Should we support init_priority for thread_local?
334  // FIXME: Ideally, initialization of instantiated thread_local static data
335  // members of class templates should not trigger initialization of other
336  // entities in the TU.
337  // FIXME: We only need to register one __cxa_thread_atexit function for the
338  // entire TU.
339  CXXThreadLocalInits.push_back(Fn);
340  CXXThreadLocalInitVars.push_back(D);
341  } else if (PerformInit && ISA) {
342  EmitPointerToInitFunc(D, Addr, Fn, ISA);
343  } else if (auto *IPA = D->getAttr<InitPriorityAttr>()) {
344  OrderGlobalInits Key(IPA->getPriority(), PrioritizedCXXGlobalInits.size());
345  PrioritizedCXXGlobalInits.push_back(std::make_pair(Key, Fn));
347  // C++ [basic.start.init]p2:
348  // Definitions of explicitly specialized class template static data
349  // members have ordered initialization. Other class template static data
350  // members (i.e., implicitly or explicitly instantiated specializations)
351  // have unordered initialization.
352  //
353  // As a consequence, we can put them into their own llvm.global_ctors entry.
354  //
355  // If the global is externally visible, put the initializer into a COMDAT
356  // group with the global being initialized. On most platforms, this is a
357  // minor startup time optimization. In the MS C++ ABI, there are no guard
358  // variables, so this COMDAT key is required for correctness.
359  AddGlobalCtor(Fn, 65535, COMDATKey);
360  } else if (D->hasAttr<SelectAnyAttr>()) {
361  // SelectAny globals will be comdat-folded. Put the initializer into a
362  // COMDAT group associated with the global, so the initializers get folded
363  // too.
364  AddGlobalCtor(Fn, 65535, COMDATKey);
365  } else {
366  I = DelayedCXXInitPosition.find(D); // Re-do lookup in case of re-hash.
367  if (I == DelayedCXXInitPosition.end()) {
368  CXXGlobalInits.push_back(Fn);
369  } else if (I->second != ~0U) {
370  assert(I->second < CXXGlobalInits.size() &&
371  CXXGlobalInits[I->second] == nullptr);
372  CXXGlobalInits[I->second] = Fn;
373  }
374  }
375 
376  // Remember that we already emitted the initializer for this global.
377  DelayedCXXInitPosition[D] = ~0U;
378 }
379 
380 void CodeGenModule::EmitCXXThreadLocalInitFunc() {
382  *this, CXXThreadLocals, CXXThreadLocalInits, CXXThreadLocalInitVars);
383 
384  CXXThreadLocalInits.clear();
385  CXXThreadLocalInitVars.clear();
386  CXXThreadLocals.clear();
387 }
388 
389 void
390 CodeGenModule::EmitCXXGlobalInitFunc() {
391  while (!CXXGlobalInits.empty() && !CXXGlobalInits.back())
392  CXXGlobalInits.pop_back();
393 
394  if (CXXGlobalInits.empty() && PrioritizedCXXGlobalInits.empty())
395  return;
396 
397  llvm::FunctionType *FTy = llvm::FunctionType::get(VoidTy, false);
399 
400  // Create our global initialization function.
401  if (!PrioritizedCXXGlobalInits.empty()) {
402  SmallVector<llvm::Function *, 8> LocalCXXGlobalInits;
403  llvm::array_pod_sort(PrioritizedCXXGlobalInits.begin(),
404  PrioritizedCXXGlobalInits.end());
405  // Iterate over "chunks" of ctors with same priority and emit each chunk
406  // into separate function. Note - everything is sorted first by priority,
407  // second - by lex order, so we emit ctor functions in proper order.
409  I = PrioritizedCXXGlobalInits.begin(),
410  E = PrioritizedCXXGlobalInits.end(); I != E; ) {
412  PrioE = std::upper_bound(I + 1, E, *I, GlobalInitPriorityCmp());
413 
414  LocalCXXGlobalInits.clear();
415  unsigned Priority = I->first.priority;
416  // Compute the function suffix from priority. Prepend with zeroes to make
417  // sure the function names are also ordered as priorities.
418  std::string PrioritySuffix = llvm::utostr(Priority);
419  // Priority is always <= 65535 (enforced by sema).
420  PrioritySuffix = std::string(6-PrioritySuffix.size(), '0')+PrioritySuffix;
421  llvm::Function *Fn = CreateGlobalInitOrDestructFunction(
422  FTy, "_GLOBAL__I_" + PrioritySuffix, FI);
423 
424  for (; I < PrioE; ++I)
425  LocalCXXGlobalInits.push_back(I->second);
426 
427  CodeGenFunction(*this).GenerateCXXGlobalInitFunc(Fn, LocalCXXGlobalInits);
428  AddGlobalCtor(Fn, Priority);
429  }
430  PrioritizedCXXGlobalInits.clear();
431  }
432 
433  SmallString<128> FileName;
434  SourceManager &SM = Context.getSourceManager();
435  if (const FileEntry *MainFile = SM.getFileEntryForID(SM.getMainFileID())) {
436  // Include the filename in the symbol name. Including "sub_" matches gcc and
437  // makes sure these symbols appear lexicographically behind the symbols with
438  // priority emitted above.
439  FileName = llvm::sys::path::filename(MainFile->getName());
440  } else {
441  FileName = "<null>";
442  }
443 
444  for (size_t i = 0; i < FileName.size(); ++i) {
445  // Replace everything that's not [a-zA-Z0-9._] with a _. This set happens
446  // to be the set of C preprocessing numbers.
447  if (!isPreprocessingNumberBody(FileName[i]))
448  FileName[i] = '_';
449  }
450 
451  llvm::Function *Fn = CreateGlobalInitOrDestructFunction(
452  FTy, llvm::Twine("_GLOBAL__sub_I_", FileName), FI);
453 
454  CodeGenFunction(*this).GenerateCXXGlobalInitFunc(Fn, CXXGlobalInits);
455  AddGlobalCtor(Fn);
456 
457  CXXGlobalInits.clear();
458 }
459 
460 void CodeGenModule::EmitCXXGlobalDtorFunc() {
461  if (CXXGlobalDtors.empty())
462  return;
463 
464  llvm::FunctionType *FTy = llvm::FunctionType::get(VoidTy, false);
465 
466  // Create our global destructor function.
468  llvm::Function *Fn =
469  CreateGlobalInitOrDestructFunction(FTy, "_GLOBAL__D_a", FI);
470 
471  CodeGenFunction(*this).GenerateCXXGlobalDtorsFunc(Fn, CXXGlobalDtors);
472  AddGlobalDtor(Fn);
473 }
474 
475 /// Emit the code necessary to initialize the given global variable.
477  const VarDecl *D,
478  llvm::GlobalVariable *Addr,
479  bool PerformInit) {
480  // Check if we need to emit debug info for variable initializer.
481  if (D->hasAttr<NoDebugAttr>())
482  DebugInfo = nullptr; // disable debug info indefinitely for this function
483 
484  CurEHLocation = D->getLocStart();
485 
487  getTypes().arrangeNullaryFunction(),
489  D->getInit()->getExprLoc());
490 
491  // Use guarded initialization if the global variable is weak. This
492  // occurs for, e.g., instantiated static data members and
493  // definitions explicitly marked weak.
494  if (Addr->hasWeakLinkage() || Addr->hasLinkOnceLinkage()) {
495  EmitCXXGuardedInit(*D, Addr, PerformInit);
496  } else {
497  EmitCXXGlobalVarDeclInit(*D, Addr, PerformInit);
498  }
499 
500  FinishFunction();
501 }
502 
503 void
506  Address Guard) {
507  {
508  auto NL = ApplyDebugLocation::CreateEmpty(*this);
510  getTypes().arrangeNullaryFunction(), FunctionArgList());
511  // Emit an artificial location for this function.
512  auto AL = ApplyDebugLocation::CreateArtificial(*this);
513 
514  llvm::BasicBlock *ExitBlock = nullptr;
515  if (Guard.isValid()) {
516  // If we have a guard variable, check whether we've already performed
517  // these initializations. This happens for TLS initialization functions.
518  llvm::Value *GuardVal = Builder.CreateLoad(Guard);
519  llvm::Value *Uninit = Builder.CreateIsNull(GuardVal,
520  "guard.uninitialized");
521  llvm::BasicBlock *InitBlock = createBasicBlock("init");
522  ExitBlock = createBasicBlock("exit");
523  Builder.CreateCondBr(Uninit, InitBlock, ExitBlock);
524  EmitBlock(InitBlock);
525  // Mark as initialized before initializing anything else. If the
526  // initializers use previously-initialized thread_local vars, that's
527  // probably supposed to be OK, but the standard doesn't say.
528  Builder.CreateStore(llvm::ConstantInt::get(GuardVal->getType(),1), Guard);
529  }
530 
531  RunCleanupsScope Scope(*this);
532 
533  // When building in Objective-C++ ARC mode, create an autorelease pool
534  // around the global initializers.
535  if (getLangOpts().ObjCAutoRefCount && getLangOpts().CPlusPlus) {
538  }
539 
540  for (unsigned i = 0, e = Decls.size(); i != e; ++i)
541  if (Decls[i])
542  EmitRuntimeCall(Decls[i]);
543 
544  Scope.ForceCleanup();
545 
546  if (ExitBlock) {
547  Builder.CreateBr(ExitBlock);
548  EmitBlock(ExitBlock);
549  }
550  }
551 
552  FinishFunction();
553 }
554 
556  const std::vector<std::pair<llvm::WeakVH, llvm::Constant*> >
557  &DtorsAndObjects) {
558  {
559  auto NL = ApplyDebugLocation::CreateEmpty(*this);
561  getTypes().arrangeNullaryFunction(), FunctionArgList());
562  // Emit an artificial location for this function.
563  auto AL = ApplyDebugLocation::CreateArtificial(*this);
564 
565  // Emit the dtors, in reverse order from construction.
566  for (unsigned i = 0, e = DtorsAndObjects.size(); i != e; ++i) {
567  llvm::Value *Callee = DtorsAndObjects[e - i - 1].first;
568  llvm::CallInst *CI = Builder.CreateCall(Callee,
569  DtorsAndObjects[e - i - 1].second);
570  // Make sure the call and the callee agree on calling convention.
571  if (llvm::Function *F = dyn_cast<llvm::Function>(Callee))
572  CI->setCallingConv(F->getCallingConv());
573  }
574  }
575 
576  FinishFunction();
577 }
578 
579 /// generateDestroyHelper - Generates a helper function which, when
580 /// invoked, destroys the given object. The address of the object
581 /// should be in global memory.
583  Address addr, QualType type, Destroyer *destroyer,
584  bool useEHCleanupForArray, const VarDecl *VD) {
585  FunctionArgList args;
586  ImplicitParamDecl dst(getContext(), nullptr, SourceLocation(), nullptr,
588  args.push_back(&dst);
589 
591  getContext().VoidTy, args, FunctionType::ExtInfo(), /*variadic=*/false);
592  llvm::FunctionType *FTy = CGM.getTypes().GetFunctionType(FI);
593  llvm::Function *fn = CGM.CreateGlobalInitOrDestructFunction(
594  FTy, "__cxx_global_array_dtor", FI, VD->getLocation());
595 
596  CurEHLocation = VD->getLocStart();
597 
598  StartFunction(VD, getContext().VoidTy, fn, FI, args);
599 
600  emitDestroy(addr, type, destroyer, useEHCleanupForArray);
601 
602  FinishFunction();
603 
604  return fn;
605 }
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:504
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:2262
Destroyer * getDestroyer(QualType::DestructionKind destructionKind)
Definition: CGDecl.cpp:1420
A (possibly-)qualified type.
Definition: Type.h:575
bool hasTrivialDestructor() const
Determine whether this class has a trivial destructor (C++ [class.dtor]p3)
Definition: DeclCXX.h:1263
DestructionKind isDestructedType() const
Returns a nonzero value if objects of this type require non-trivial work to clean up after...
Definition: Type.h:1003
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:524
QuantityType getQuantity() const
getQuantity - Get the raw integer representation of this quantity.
Definition: CharUnits.h:171
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:1070
const LangOptions & getLangOpts() const
const CGFunctionInfo & arrangeFreeFunctionDeclaration(QualType ResTy, const FunctionArgList &Args, const FunctionType::ExtInfo &Info, bool isVariadic)
Definition: CGCall.cpp:490
VarDecl - An instance of this class is created to represent a variable declaration or definition...
Definition: Decl.h:699
TLSKind getTLSKind() const
Definition: Decl.cpp:1818
llvm::Value * EmitObjCAutoreleasePoolPush()
Produce the code to do a objc_autoreleasepool_push.
Definition: CGObjC.cpp:2278
bool hasGlobalStorage() const
Returns true for all variables that do not have local storage.
Definition: Decl.h:926
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:1496
class LLVM_ALIGNAS(8) DependentTemplateSpecializationType const IdentifierInfo * Name
Represents a template specialization type whose template cannot be resolved, e.g. ...
Definition: Type.h:4381
bool hasAttr() const
Definition: DeclBase.h:498
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:460
bool isReferenceType() const
Definition: Type.h:5314
llvm::CallInst * EmitRuntimeCall(llvm::Value *callee, const Twine &name="")
void GenerateCXXGlobalDtorsFunc(llvm::Function *Fn, const std::vector< std::pair< llvm::WeakVH, llvm::Constant * > > &DtorsAndObjects)
GenerateCXXGlobalDtorsFunc - Generates code for destroying global variables.
Definition: CGDeclCXX.cpp:555
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:476
static ApplyDebugLocation CreateArtificial(CodeGenFunction &CGF)
Apply TemporaryLocation if it is valid.
Definition: CGDebugInfo.h:562
T * getAttr() const
Definition: DeclBase.h:495
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:219
Scope - A scope is a transient data structure that is used while parsing the program.
Definition: Scope.h:38
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:530
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...
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.
LValue MakeAddrLValue(Address Addr, QualType T, AlignmentSource AlignSource=AlignmentSource::Type)
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
ID
Defines the set of possible language-specific address spaces.
Definition: AddressSpaces.h:27
SourceManager & SM
void EmitCXXGuardedInit(const VarDecl &D, llvm::GlobalVariable *DeclPtr, bool PerformInit)
Emit code in this function to perform a guarded variable initialization.
Definition: CGDeclCXX.cpp:237
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:582
Expr - This represents one expression.
Definition: Expr.h:104
CGCXXABI & getCXXABI() const
Enters a new scope for capturing cleanups, all of which will be executed once the scope is exited...
void EmitStoreOfScalar(llvm::Value *Value, Address Addr, bool Volatile, QualType Ty, AlignmentSource AlignSource=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:1348
const CGFunctionInfo & arrangeNullaryFunction()
getNullaryFunctionInfo - Get the function info for a void() function with standard CC...
Definition: CGCall.cpp:505
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:2345
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
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.
bool isExternallyVisible() const
Definition: Decl.h:280
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)
Creates clause with a list of variables VL and a linear step Step.
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:132
bool isTemplateInstantiation(TemplateSpecializationKind Kind)
Determine whether this template specialization kind refers to an instantiation of an entity (as oppos...
Definition: Specifiers.h:162
GlobalDecl - represents a global declaration.
Definition: GlobalDecl.h:28
The l-value was considered opaque, so the alignment was determined from a type.
llvm::Constant * CreateRuntimeFunction(llvm::FunctionType *Ty, StringRef Name, llvm::AttributeSet ExtraAttrs=llvm::AttributeSet())
Create a new runtime function with the specified type and name.
ASTContext & getContext() const
Encodes a location in the source.
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:186
Cached information about one file (either on disk or in the virtual file system). ...
Definition: FileManager.h:53
CanQualType VoidTy
Definition: ASTContext.h:881
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:95
FileID getMainFileID() const
Returns the FileID of the main source file.
llvm::Constant * getAddrOfCXXStructor(const CXXMethodDecl *MD, StructorType Type, const CGFunctionInfo *FnInfo=nullptr, llvm::FunctionType *FnType=nullptr, bool DontDefer=false, bool IsForDefinition=false)
Return the address of the constructor/destructor of the given type.
Definition: CGCXX.cpp:242
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:193
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:146
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.
CXXDestructorDecl * getDestructor() const
Returns the destructor decl for this class.
Definition: DeclCXX.cpp:1308
const internal::VariadicAllOfMatcher< Type > type
Matches Types in the clang AST.
Definition: ASTMatchers.h:1723
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:78
bool isObjCWeak() const
Definition: CGValue.h:288
SourceLocation getLocStart() const LLVM_READONLY
Definition: Decl.h:624
detail::InMemoryDirectory::const_iterator E
llvm::StoreInst * CreateStore(llvm::Value *Val, Address Addr, bool IsVolatile=false)
Definition: CGBuilder.h:121
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:1401
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:658
CXXRecordDecl * getAsCXXRecordDecl() const
Retrieves the CXXRecordDecl that this type refers to, either because the type is a RecordType or beca...
Definition: Type.cpp:1522
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:367
static void EmitDeclInit(CodeGenFunction &CGF, const VarDecl &D, ConstantAddress DeclPtr)
Definition: CGDeclCXX.cpp:26
SourceManager & getSourceManager()
Definition: ASTContext.h:553
Represents a C++ struct/union/class.
Definition: DeclCXX.h:285
bool isObjCStrong() const
Definition: CGValue.h:291
llvm::Function * CreateGlobalInitOrDestructFunction(llvm::FunctionType *ty, const Twine &name, const CGFunctionInfo &FI, SourceLocation Loc=SourceLocation(), bool TLS=false)
Definition: CGDeclCXX.cpp:251
A specialization of Address that requires the address to be an LLVM Constant.
Definition: Address.h:75
void ForceCleanup()
Force the emission of cleanups now, instead of waiting until this object is destroyed.
void EmitObjCAutoreleasePoolCleanup(llvm::Value *Ptr)
Definition: CGObjC.cpp:2385
unsigned getTargetAddressSpace(QualType T) const
Definition: ASTContext.h:2180
static ApplyDebugLocation CreateEmpty(CodeGenFunction &CGF)
Set the IRBuilder to not attach debug locations.
Definition: CGDebugInfo.h:579
CodeGenTypes & getTypes() const
SourceLocation getLocation() const
Definition: DeclBase.h:384
LValue - This represents an lvalue references.
Definition: CGValue.h:152
This class handles loading and caching of source files into memory.
A class which abstracts out some details necessary for making a call.
Definition: Type.h:2872
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:114
llvm::FunctionType * GetFunctionType(const CGFunctionInfo &Info)
GetFunctionType - Get the LLVM function type for.
Definition: CGCall.cpp:1293