clang  9.0.0svn
CGExprAgg.cpp
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1 //===--- CGExprAgg.cpp - Emit LLVM Code from Aggregate Expressions --------===//
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 to emit Aggregate Expr nodes as LLVM code.
10 //
11 //===----------------------------------------------------------------------===//
12 
13 #include "CodeGenFunction.h"
14 #include "CGCXXABI.h"
15 #include "CGObjCRuntime.h"
16 #include "CodeGenModule.h"
17 #include "ConstantEmitter.h"
18 #include "clang/AST/ASTContext.h"
19 #include "clang/AST/DeclCXX.h"
20 #include "clang/AST/DeclTemplate.h"
21 #include "clang/AST/StmtVisitor.h"
22 #include "llvm/IR/Constants.h"
23 #include "llvm/IR/Function.h"
24 #include "llvm/IR/GlobalVariable.h"
25 #include "llvm/IR/Intrinsics.h"
26 #include "llvm/IR/IntrinsicInst.h"
27 using namespace clang;
28 using namespace CodeGen;
29 
30 //===----------------------------------------------------------------------===//
31 // Aggregate Expression Emitter
32 //===----------------------------------------------------------------------===//
33 
34 namespace {
35 class AggExprEmitter : public StmtVisitor<AggExprEmitter> {
36  CodeGenFunction &CGF;
37  CGBuilderTy &Builder;
38  AggValueSlot Dest;
39  bool IsResultUnused;
40 
41  AggValueSlot EnsureSlot(QualType T) {
42  if (!Dest.isIgnored()) return Dest;
43  return CGF.CreateAggTemp(T, "agg.tmp.ensured");
44  }
45  void EnsureDest(QualType T) {
46  if (!Dest.isIgnored()) return;
47  Dest = CGF.CreateAggTemp(T, "agg.tmp.ensured");
48  }
49 
50  // Calls `Fn` with a valid return value slot, potentially creating a temporary
51  // to do so. If a temporary is created, an appropriate copy into `Dest` will
52  // be emitted, as will lifetime markers.
53  //
54  // The given function should take a ReturnValueSlot, and return an RValue that
55  // points to said slot.
56  void withReturnValueSlot(const Expr *E,
57  llvm::function_ref<RValue(ReturnValueSlot)> Fn);
58 
59 public:
60  AggExprEmitter(CodeGenFunction &cgf, AggValueSlot Dest, bool IsResultUnused)
61  : CGF(cgf), Builder(CGF.Builder), Dest(Dest),
62  IsResultUnused(IsResultUnused) { }
63 
64  //===--------------------------------------------------------------------===//
65  // Utilities
66  //===--------------------------------------------------------------------===//
67 
68  /// EmitAggLoadOfLValue - Given an expression with aggregate type that
69  /// represents a value lvalue, this method emits the address of the lvalue,
70  /// then loads the result into DestPtr.
71  void EmitAggLoadOfLValue(const Expr *E);
72 
73  enum ExprValueKind {
74  EVK_RValue,
75  EVK_NonRValue
76  };
77 
78  /// EmitFinalDestCopy - Perform the final copy to DestPtr, if desired.
79  /// SrcIsRValue is true if source comes from an RValue.
80  void EmitFinalDestCopy(QualType type, const LValue &src,
81  ExprValueKind SrcValueKind = EVK_NonRValue);
82  void EmitFinalDestCopy(QualType type, RValue src);
83  void EmitCopy(QualType type, const AggValueSlot &dest,
84  const AggValueSlot &src);
85 
86  void EmitMoveFromReturnSlot(const Expr *E, RValue Src);
87 
88  void EmitArrayInit(Address DestPtr, llvm::ArrayType *AType,
89  QualType ArrayQTy, InitListExpr *E);
90 
92  if (CGF.getLangOpts().getGC() && TypeRequiresGCollection(T))
95  }
96 
97  bool TypeRequiresGCollection(QualType T);
98 
99  //===--------------------------------------------------------------------===//
100  // Visitor Methods
101  //===--------------------------------------------------------------------===//
102 
103  void Visit(Expr *E) {
104  ApplyDebugLocation DL(CGF, E);
106  }
107 
108  void VisitStmt(Stmt *S) {
109  CGF.ErrorUnsupported(S, "aggregate expression");
110  }
111  void VisitParenExpr(ParenExpr *PE) { Visit(PE->getSubExpr()); }
112  void VisitGenericSelectionExpr(GenericSelectionExpr *GE) {
113  Visit(GE->getResultExpr());
114  }
115  void VisitCoawaitExpr(CoawaitExpr *E) {
116  CGF.EmitCoawaitExpr(*E, Dest, IsResultUnused);
117  }
118  void VisitCoyieldExpr(CoyieldExpr *E) {
119  CGF.EmitCoyieldExpr(*E, Dest, IsResultUnused);
120  }
121  void VisitUnaryCoawait(UnaryOperator *E) { Visit(E->getSubExpr()); }
122  void VisitUnaryExtension(UnaryOperator *E) { Visit(E->getSubExpr()); }
123  void VisitSubstNonTypeTemplateParmExpr(SubstNonTypeTemplateParmExpr *E) {
124  return Visit(E->getReplacement());
125  }
126 
127  void VisitConstantExpr(ConstantExpr *E) {
128  return Visit(E->getSubExpr());
129  }
130 
131  // l-values.
132  void VisitDeclRefExpr(DeclRefExpr *E) { EmitAggLoadOfLValue(E); }
133  void VisitMemberExpr(MemberExpr *ME) { EmitAggLoadOfLValue(ME); }
134  void VisitUnaryDeref(UnaryOperator *E) { EmitAggLoadOfLValue(E); }
135  void VisitStringLiteral(StringLiteral *E) { EmitAggLoadOfLValue(E); }
136  void VisitCompoundLiteralExpr(CompoundLiteralExpr *E);
137  void VisitArraySubscriptExpr(ArraySubscriptExpr *E) {
138  EmitAggLoadOfLValue(E);
139  }
140  void VisitPredefinedExpr(const PredefinedExpr *E) {
141  EmitAggLoadOfLValue(E);
142  }
143 
144  // Operators.
145  void VisitCastExpr(CastExpr *E);
146  void VisitCallExpr(const CallExpr *E);
147  void VisitStmtExpr(const StmtExpr *E);
148  void VisitBinaryOperator(const BinaryOperator *BO);
149  void VisitPointerToDataMemberBinaryOperator(const BinaryOperator *BO);
150  void VisitBinAssign(const BinaryOperator *E);
151  void VisitBinComma(const BinaryOperator *E);
152  void VisitBinCmp(const BinaryOperator *E);
153 
154  void VisitObjCMessageExpr(ObjCMessageExpr *E);
155  void VisitObjCIvarRefExpr(ObjCIvarRefExpr *E) {
156  EmitAggLoadOfLValue(E);
157  }
158 
159  void VisitDesignatedInitUpdateExpr(DesignatedInitUpdateExpr *E);
160  void VisitAbstractConditionalOperator(const AbstractConditionalOperator *CO);
161  void VisitChooseExpr(const ChooseExpr *CE);
162  void VisitInitListExpr(InitListExpr *E);
163  void VisitArrayInitLoopExpr(const ArrayInitLoopExpr *E,
164  llvm::Value *outerBegin = nullptr);
165  void VisitImplicitValueInitExpr(ImplicitValueInitExpr *E);
166  void VisitNoInitExpr(NoInitExpr *E) { } // Do nothing.
167  void VisitCXXDefaultArgExpr(CXXDefaultArgExpr *DAE) {
168  Visit(DAE->getExpr());
169  }
170  void VisitCXXDefaultInitExpr(CXXDefaultInitExpr *DIE) {
172  Visit(DIE->getExpr());
173  }
174  void VisitCXXBindTemporaryExpr(CXXBindTemporaryExpr *E);
175  void VisitCXXConstructExpr(const CXXConstructExpr *E);
176  void VisitCXXInheritedCtorInitExpr(const CXXInheritedCtorInitExpr *E);
177  void VisitLambdaExpr(LambdaExpr *E);
178  void VisitCXXStdInitializerListExpr(CXXStdInitializerListExpr *E);
179  void VisitExprWithCleanups(ExprWithCleanups *E);
180  void VisitCXXScalarValueInitExpr(CXXScalarValueInitExpr *E);
181  void VisitCXXTypeidExpr(CXXTypeidExpr *E) { EmitAggLoadOfLValue(E); }
182  void VisitMaterializeTemporaryExpr(MaterializeTemporaryExpr *E);
183  void VisitOpaqueValueExpr(OpaqueValueExpr *E);
184 
185  void VisitPseudoObjectExpr(PseudoObjectExpr *E) {
186  if (E->isGLValue()) {
187  LValue LV = CGF.EmitPseudoObjectLValue(E);
188  return EmitFinalDestCopy(E->getType(), LV);
189  }
190 
191  CGF.EmitPseudoObjectRValue(E, EnsureSlot(E->getType()));
192  }
193 
194  void VisitVAArgExpr(VAArgExpr *E);
195 
196  void EmitInitializationToLValue(Expr *E, LValue Address);
197  void EmitNullInitializationToLValue(LValue Address);
198  // case Expr::ChooseExprClass:
199  void VisitCXXThrowExpr(const CXXThrowExpr *E) { CGF.EmitCXXThrowExpr(E); }
200  void VisitAtomicExpr(AtomicExpr *E) {
201  RValue Res = CGF.EmitAtomicExpr(E);
202  EmitFinalDestCopy(E->getType(), Res);
203  }
204 };
205 } // end anonymous namespace.
206 
207 //===----------------------------------------------------------------------===//
208 // Utilities
209 //===----------------------------------------------------------------------===//
210 
211 /// EmitAggLoadOfLValue - Given an expression with aggregate type that
212 /// represents a value lvalue, this method emits the address of the lvalue,
213 /// then loads the result into DestPtr.
214 void AggExprEmitter::EmitAggLoadOfLValue(const Expr *E) {
215  LValue LV = CGF.EmitLValue(E);
216 
217  // If the type of the l-value is atomic, then do an atomic load.
218  if (LV.getType()->isAtomicType() || CGF.LValueIsSuitableForInlineAtomic(LV)) {
219  CGF.EmitAtomicLoad(LV, E->getExprLoc(), Dest);
220  return;
221  }
222 
223  EmitFinalDestCopy(E->getType(), LV);
224 }
225 
226 /// True if the given aggregate type requires special GC API calls.
227 bool AggExprEmitter::TypeRequiresGCollection(QualType T) {
228  // Only record types have members that might require garbage collection.
229  const RecordType *RecordTy = T->getAs<RecordType>();
230  if (!RecordTy) return false;
231 
232  // Don't mess with non-trivial C++ types.
233  RecordDecl *Record = RecordTy->getDecl();
234  if (isa<CXXRecordDecl>(Record) &&
235  (cast<CXXRecordDecl>(Record)->hasNonTrivialCopyConstructor() ||
236  !cast<CXXRecordDecl>(Record)->hasTrivialDestructor()))
237  return false;
238 
239  // Check whether the type has an object member.
240  return Record->hasObjectMember();
241 }
242 
243 void AggExprEmitter::withReturnValueSlot(
244  const Expr *E, llvm::function_ref<RValue(ReturnValueSlot)> EmitCall) {
245  QualType RetTy = E->getType();
246  bool RequiresDestruction =
247  Dest.isIgnored() &&
249 
250  // If it makes no observable difference, save a memcpy + temporary.
251  //
252  // We need to always provide our own temporary if destruction is required.
253  // Otherwise, EmitCall will emit its own, notice that it's "unused", and end
254  // its lifetime before we have the chance to emit a proper destructor call.
255  bool UseTemp = Dest.isPotentiallyAliased() || Dest.requiresGCollection() ||
256  (RequiresDestruction && !Dest.getAddress().isValid());
257 
258  Address RetAddr = Address::invalid();
259  Address RetAllocaAddr = Address::invalid();
260 
261  EHScopeStack::stable_iterator LifetimeEndBlock;
262  llvm::Value *LifetimeSizePtr = nullptr;
263  llvm::IntrinsicInst *LifetimeStartInst = nullptr;
264  if (!UseTemp) {
265  RetAddr = Dest.getAddress();
266  } else {
267  RetAddr = CGF.CreateMemTemp(RetTy, "tmp", &RetAllocaAddr);
268  uint64_t Size =
269  CGF.CGM.getDataLayout().getTypeAllocSize(CGF.ConvertTypeForMem(RetTy));
270  LifetimeSizePtr = CGF.EmitLifetimeStart(Size, RetAllocaAddr.getPointer());
271  if (LifetimeSizePtr) {
272  LifetimeStartInst =
273  cast<llvm::IntrinsicInst>(std::prev(Builder.GetInsertPoint()));
274  assert(LifetimeStartInst->getIntrinsicID() ==
275  llvm::Intrinsic::lifetime_start &&
276  "Last insertion wasn't a lifetime.start?");
277 
279  NormalEHLifetimeMarker, RetAllocaAddr, LifetimeSizePtr);
280  LifetimeEndBlock = CGF.EHStack.stable_begin();
281  }
282  }
283 
284  RValue Src =
285  EmitCall(ReturnValueSlot(RetAddr, Dest.isVolatile(), IsResultUnused));
286 
287  if (RequiresDestruction)
288  CGF.pushDestroy(RetTy.isDestructedType(), Src.getAggregateAddress(), RetTy);
289 
290  if (!UseTemp)
291  return;
292 
293  assert(Dest.getPointer() != Src.getAggregatePointer());
294  EmitFinalDestCopy(E->getType(), Src);
295 
296  if (!RequiresDestruction && LifetimeStartInst) {
297  // If there's no dtor to run, the copy was the last use of our temporary.
298  // Since we're not guaranteed to be in an ExprWithCleanups, clean up
299  // eagerly.
300  CGF.DeactivateCleanupBlock(LifetimeEndBlock, LifetimeStartInst);
301  CGF.EmitLifetimeEnd(LifetimeSizePtr, RetAllocaAddr.getPointer());
302  }
303 }
304 
305 /// EmitFinalDestCopy - Perform the final copy to DestPtr, if desired.
306 void AggExprEmitter::EmitFinalDestCopy(QualType type, RValue src) {
307  assert(src.isAggregate() && "value must be aggregate value!");
308  LValue srcLV = CGF.MakeAddrLValue(src.getAggregateAddress(), type);
309  EmitFinalDestCopy(type, srcLV, EVK_RValue);
310 }
311 
312 /// EmitFinalDestCopy - Perform the final copy to DestPtr, if desired.
313 void AggExprEmitter::EmitFinalDestCopy(QualType type, const LValue &src,
314  ExprValueKind SrcValueKind) {
315  // If Dest is ignored, then we're evaluating an aggregate expression
316  // in a context that doesn't care about the result. Note that loads
317  // from volatile l-values force the existence of a non-ignored
318  // destination.
319  if (Dest.isIgnored())
320  return;
321 
322  // Copy non-trivial C structs here.
323  LValue DstLV = CGF.MakeAddrLValue(
324  Dest.getAddress(), Dest.isVolatile() ? type.withVolatile() : type);
325 
326  if (SrcValueKind == EVK_RValue) {
328  if (Dest.isPotentiallyAliased())
329  CGF.callCStructMoveAssignmentOperator(DstLV, src);
330  else
331  CGF.callCStructMoveConstructor(DstLV, src);
332  return;
333  }
334  } else {
336  if (Dest.isPotentiallyAliased())
337  CGF.callCStructCopyAssignmentOperator(DstLV, src);
338  else
339  CGF.callCStructCopyConstructor(DstLV, src);
340  return;
341  }
342  }
343 
344  AggValueSlot srcAgg =
346  needsGC(type), AggValueSlot::IsAliased,
348  EmitCopy(type, Dest, srcAgg);
349 }
350 
351 /// Perform a copy from the source into the destination.
352 ///
353 /// \param type - the type of the aggregate being copied; qualifiers are
354 /// ignored
355 void AggExprEmitter::EmitCopy(QualType type, const AggValueSlot &dest,
356  const AggValueSlot &src) {
357  if (dest.requiresGCollection()) {
358  CharUnits sz = dest.getPreferredSize(CGF.getContext(), type);
359  llvm::Value *size = llvm::ConstantInt::get(CGF.SizeTy, sz.getQuantity());
361  dest.getAddress(),
362  src.getAddress(),
363  size);
364  return;
365  }
366 
367  // If the result of the assignment is used, copy the LHS there also.
368  // It's volatile if either side is. Use the minimum alignment of
369  // the two sides.
370  LValue DestLV = CGF.MakeAddrLValue(dest.getAddress(), type);
371  LValue SrcLV = CGF.MakeAddrLValue(src.getAddress(), type);
372  CGF.EmitAggregateCopy(DestLV, SrcLV, type, dest.mayOverlap(),
373  dest.isVolatile() || src.isVolatile());
374 }
375 
376 /// Emit the initializer for a std::initializer_list initialized with a
377 /// real initializer list.
378 void
379 AggExprEmitter::VisitCXXStdInitializerListExpr(CXXStdInitializerListExpr *E) {
380  // Emit an array containing the elements. The array is externally destructed
381  // if the std::initializer_list object is.
382  ASTContext &Ctx = CGF.getContext();
383  LValue Array = CGF.EmitLValue(E->getSubExpr());
384  assert(Array.isSimple() && "initializer_list array not a simple lvalue");
385  Address ArrayPtr = Array.getAddress();
386 
389  assert(ArrayType && "std::initializer_list constructed from non-array");
390 
391  // FIXME: Perform the checks on the field types in SemaInit.
392  RecordDecl *Record = E->getType()->castAs<RecordType>()->getDecl();
394  if (Field == Record->field_end()) {
395  CGF.ErrorUnsupported(E, "weird std::initializer_list");
396  return;
397  }
398 
399  // Start pointer.
400  if (!Field->getType()->isPointerType() ||
401  !Ctx.hasSameType(Field->getType()->getPointeeType(),
402  ArrayType->getElementType())) {
403  CGF.ErrorUnsupported(E, "weird std::initializer_list");
404  return;
405  }
406 
407  AggValueSlot Dest = EnsureSlot(E->getType());
408  LValue DestLV = CGF.MakeAddrLValue(Dest.getAddress(), E->getType());
409  LValue Start = CGF.EmitLValueForFieldInitialization(DestLV, *Field);
410  llvm::Value *Zero = llvm::ConstantInt::get(CGF.PtrDiffTy, 0);
411  llvm::Value *IdxStart[] = { Zero, Zero };
412  llvm::Value *ArrayStart =
413  Builder.CreateInBoundsGEP(ArrayPtr.getPointer(), IdxStart, "arraystart");
414  CGF.EmitStoreThroughLValue(RValue::get(ArrayStart), Start);
415  ++Field;
416 
417  if (Field == Record->field_end()) {
418  CGF.ErrorUnsupported(E, "weird std::initializer_list");
419  return;
420  }
421 
422  llvm::Value *Size = Builder.getInt(ArrayType->getSize());
423  LValue EndOrLength = CGF.EmitLValueForFieldInitialization(DestLV, *Field);
424  if (Field->getType()->isPointerType() &&
425  Ctx.hasSameType(Field->getType()->getPointeeType(),
426  ArrayType->getElementType())) {
427  // End pointer.
428  llvm::Value *IdxEnd[] = { Zero, Size };
429  llvm::Value *ArrayEnd =
430  Builder.CreateInBoundsGEP(ArrayPtr.getPointer(), IdxEnd, "arrayend");
431  CGF.EmitStoreThroughLValue(RValue::get(ArrayEnd), EndOrLength);
432  } else if (Ctx.hasSameType(Field->getType(), Ctx.getSizeType())) {
433  // Length.
434  CGF.EmitStoreThroughLValue(RValue::get(Size), EndOrLength);
435  } else {
436  CGF.ErrorUnsupported(E, "weird std::initializer_list");
437  return;
438  }
439 }
440 
441 /// Determine if E is a trivial array filler, that is, one that is
442 /// equivalent to zero-initialization.
443 static bool isTrivialFiller(Expr *E) {
444  if (!E)
445  return true;
446 
447  if (isa<ImplicitValueInitExpr>(E))
448  return true;
449 
450  if (auto *ILE = dyn_cast<InitListExpr>(E)) {
451  if (ILE->getNumInits())
452  return false;
453  return isTrivialFiller(ILE->getArrayFiller());
454  }
455 
456  if (auto *Cons = dyn_cast_or_null<CXXConstructExpr>(E))
457  return Cons->getConstructor()->isDefaultConstructor() &&
458  Cons->getConstructor()->isTrivial();
459 
460  // FIXME: Are there other cases where we can avoid emitting an initializer?
461  return false;
462 }
463 
464 /// Emit initialization of an array from an initializer list.
465 void AggExprEmitter::EmitArrayInit(Address DestPtr, llvm::ArrayType *AType,
466  QualType ArrayQTy, InitListExpr *E) {
467  uint64_t NumInitElements = E->getNumInits();
468 
469  uint64_t NumArrayElements = AType->getNumElements();
470  assert(NumInitElements <= NumArrayElements);
471 
472  QualType elementType =
473  CGF.getContext().getAsArrayType(ArrayQTy)->getElementType();
474 
475  // DestPtr is an array*. Construct an elementType* by drilling
476  // down a level.
477  llvm::Value *zero = llvm::ConstantInt::get(CGF.SizeTy, 0);
478  llvm::Value *indices[] = { zero, zero };
479  llvm::Value *begin =
480  Builder.CreateInBoundsGEP(DestPtr.getPointer(), indices, "arrayinit.begin");
481 
482  CharUnits elementSize = CGF.getContext().getTypeSizeInChars(elementType);
483  CharUnits elementAlign =
484  DestPtr.getAlignment().alignmentOfArrayElement(elementSize);
485 
486  // Consider initializing the array by copying from a global. For this to be
487  // more efficient than per-element initialization, the size of the elements
488  // with explicit initializers should be large enough.
489  if (NumInitElements * elementSize.getQuantity() > 16 &&
490  elementType.isTriviallyCopyableType(CGF.getContext())) {
491  CodeGen::CodeGenModule &CGM = CGF.CGM;
492  ConstantEmitter Emitter(CGM);
493  LangAS AS = ArrayQTy.getAddressSpace();
494  if (llvm::Constant *C = Emitter.tryEmitForInitializer(E, AS, ArrayQTy)) {
495  auto GV = new llvm::GlobalVariable(
496  CGM.getModule(), C->getType(),
497  CGM.isTypeConstant(ArrayQTy, /* ExcludeCtorDtor= */ true),
498  llvm::GlobalValue::PrivateLinkage, C, "constinit",
499  /* InsertBefore= */ nullptr, llvm::GlobalVariable::NotThreadLocal,
501  Emitter.finalize(GV);
502  CharUnits Align = CGM.getContext().getTypeAlignInChars(ArrayQTy);
503  GV->setAlignment(Align.getQuantity());
504  EmitFinalDestCopy(ArrayQTy, CGF.MakeAddrLValue(GV, ArrayQTy, Align));
505  return;
506  }
507  }
508 
509  // Exception safety requires us to destroy all the
510  // already-constructed members if an initializer throws.
511  // For that, we'll need an EH cleanup.
512  QualType::DestructionKind dtorKind = elementType.isDestructedType();
513  Address endOfInit = Address::invalid();
515  llvm::Instruction *cleanupDominator = nullptr;
516  if (CGF.needsEHCleanup(dtorKind)) {
517  // In principle we could tell the cleanup where we are more
518  // directly, but the control flow can get so varied here that it
519  // would actually be quite complex. Therefore we go through an
520  // alloca.
521  endOfInit = CGF.CreateTempAlloca(begin->getType(), CGF.getPointerAlign(),
522  "arrayinit.endOfInit");
523  cleanupDominator = Builder.CreateStore(begin, endOfInit);
524  CGF.pushIrregularPartialArrayCleanup(begin, endOfInit, elementType,
525  elementAlign,
526  CGF.getDestroyer(dtorKind));
527  cleanup = CGF.EHStack.stable_begin();
528 
529  // Otherwise, remember that we didn't need a cleanup.
530  } else {
531  dtorKind = QualType::DK_none;
532  }
533 
534  llvm::Value *one = llvm::ConstantInt::get(CGF.SizeTy, 1);
535 
536  // The 'current element to initialize'. The invariants on this
537  // variable are complicated. Essentially, after each iteration of
538  // the loop, it points to the last initialized element, except
539  // that it points to the beginning of the array before any
540  // elements have been initialized.
541  llvm::Value *element = begin;
542 
543  // Emit the explicit initializers.
544  for (uint64_t i = 0; i != NumInitElements; ++i) {
545  // Advance to the next element.
546  if (i > 0) {
547  element = Builder.CreateInBoundsGEP(element, one, "arrayinit.element");
548 
549  // Tell the cleanup that it needs to destroy up to this
550  // element. TODO: some of these stores can be trivially
551  // observed to be unnecessary.
552  if (endOfInit.isValid()) Builder.CreateStore(element, endOfInit);
553  }
554 
555  LValue elementLV =
556  CGF.MakeAddrLValue(Address(element, elementAlign), elementType);
557  EmitInitializationToLValue(E->getInit(i), elementLV);
558  }
559 
560  // Check whether there's a non-trivial array-fill expression.
561  Expr *filler = E->getArrayFiller();
562  bool hasTrivialFiller = isTrivialFiller(filler);
563 
564  // Any remaining elements need to be zero-initialized, possibly
565  // using the filler expression. We can skip this if the we're
566  // emitting to zeroed memory.
567  if (NumInitElements != NumArrayElements &&
568  !(Dest.isZeroed() && hasTrivialFiller &&
569  CGF.getTypes().isZeroInitializable(elementType))) {
570 
571  // Use an actual loop. This is basically
572  // do { *array++ = filler; } while (array != end);
573 
574  // Advance to the start of the rest of the array.
575  if (NumInitElements) {
576  element = Builder.CreateInBoundsGEP(element, one, "arrayinit.start");
577  if (endOfInit.isValid()) Builder.CreateStore(element, endOfInit);
578  }
579 
580  // Compute the end of the array.
581  llvm::Value *end = Builder.CreateInBoundsGEP(begin,
582  llvm::ConstantInt::get(CGF.SizeTy, NumArrayElements),
583  "arrayinit.end");
584 
585  llvm::BasicBlock *entryBB = Builder.GetInsertBlock();
586  llvm::BasicBlock *bodyBB = CGF.createBasicBlock("arrayinit.body");
587 
588  // Jump into the body.
589  CGF.EmitBlock(bodyBB);
590  llvm::PHINode *currentElement =
591  Builder.CreatePHI(element->getType(), 2, "arrayinit.cur");
592  currentElement->addIncoming(element, entryBB);
593 
594  // Emit the actual filler expression.
595  {
596  // C++1z [class.temporary]p5:
597  // when a default constructor is called to initialize an element of
598  // an array with no corresponding initializer [...] the destruction of
599  // every temporary created in a default argument is sequenced before
600  // the construction of the next array element, if any
601  CodeGenFunction::RunCleanupsScope CleanupsScope(CGF);
602  LValue elementLV =
603  CGF.MakeAddrLValue(Address(currentElement, elementAlign), elementType);
604  if (filler)
605  EmitInitializationToLValue(filler, elementLV);
606  else
607  EmitNullInitializationToLValue(elementLV);
608  }
609 
610  // Move on to the next element.
611  llvm::Value *nextElement =
612  Builder.CreateInBoundsGEP(currentElement, one, "arrayinit.next");
613 
614  // Tell the EH cleanup that we finished with the last element.
615  if (endOfInit.isValid()) Builder.CreateStore(nextElement, endOfInit);
616 
617  // Leave the loop if we're done.
618  llvm::Value *done = Builder.CreateICmpEQ(nextElement, end,
619  "arrayinit.done");
620  llvm::BasicBlock *endBB = CGF.createBasicBlock("arrayinit.end");
621  Builder.CreateCondBr(done, endBB, bodyBB);
622  currentElement->addIncoming(nextElement, Builder.GetInsertBlock());
623 
624  CGF.EmitBlock(endBB);
625  }
626 
627  // Leave the partial-array cleanup if we entered one.
628  if (dtorKind) CGF.DeactivateCleanupBlock(cleanup, cleanupDominator);
629 }
630 
631 //===----------------------------------------------------------------------===//
632 // Visitor Methods
633 //===----------------------------------------------------------------------===//
634 
635 void AggExprEmitter::VisitMaterializeTemporaryExpr(MaterializeTemporaryExpr *E){
636  Visit(E->GetTemporaryExpr());
637 }
638 
639 void AggExprEmitter::VisitOpaqueValueExpr(OpaqueValueExpr *e) {
640  // If this is a unique OVE, just visit its source expression.
641  if (e->isUnique())
642  Visit(e->getSourceExpr());
643  else
644  EmitFinalDestCopy(e->getType(), CGF.getOrCreateOpaqueLValueMapping(e));
645 }
646 
647 void
648 AggExprEmitter::VisitCompoundLiteralExpr(CompoundLiteralExpr *E) {
649  if (Dest.isPotentiallyAliased() &&
650  E->getType().isPODType(CGF.getContext())) {
651  // For a POD type, just emit a load of the lvalue + a copy, because our
652  // compound literal might alias the destination.
653  EmitAggLoadOfLValue(E);
654  return;
655  }
656 
657  AggValueSlot Slot = EnsureSlot(E->getType());
658  CGF.EmitAggExpr(E->getInitializer(), Slot);
659 }
660 
661 /// Attempt to look through various unimportant expressions to find a
662 /// cast of the given kind.
664  while (true) {
665  op = op->IgnoreParens();
666  if (CastExpr *castE = dyn_cast<CastExpr>(op)) {
667  if (castE->getCastKind() == kind)
668  return castE->getSubExpr();
669  if (castE->getCastKind() == CK_NoOp)
670  continue;
671  }
672  return nullptr;
673  }
674 }
675 
676 void AggExprEmitter::VisitCastExpr(CastExpr *E) {
677  if (const auto *ECE = dyn_cast<ExplicitCastExpr>(E))
678  CGF.CGM.EmitExplicitCastExprType(ECE, &CGF);
679  switch (E->getCastKind()) {
680  case CK_Dynamic: {
681  // FIXME: Can this actually happen? We have no test coverage for it.
682  assert(isa<CXXDynamicCastExpr>(E) && "CK_Dynamic without a dynamic_cast?");
683  LValue LV = CGF.EmitCheckedLValue(E->getSubExpr(),
685  // FIXME: Do we also need to handle property references here?
686  if (LV.isSimple())
687  CGF.EmitDynamicCast(LV.getAddress(), cast<CXXDynamicCastExpr>(E));
688  else
689  CGF.CGM.ErrorUnsupported(E, "non-simple lvalue dynamic_cast");
690 
691  if (!Dest.isIgnored())
692  CGF.CGM.ErrorUnsupported(E, "lvalue dynamic_cast with a destination");
693  break;
694  }
695 
696  case CK_ToUnion: {
697  // Evaluate even if the destination is ignored.
698  if (Dest.isIgnored()) {
700  /*ignoreResult=*/true);
701  break;
702  }
703 
704  // GCC union extension
705  QualType Ty = E->getSubExpr()->getType();
706  Address CastPtr =
707  Builder.CreateElementBitCast(Dest.getAddress(), CGF.ConvertType(Ty));
708  EmitInitializationToLValue(E->getSubExpr(),
709  CGF.MakeAddrLValue(CastPtr, Ty));
710  break;
711  }
712 
713  case CK_DerivedToBase:
714  case CK_BaseToDerived:
715  case CK_UncheckedDerivedToBase: {
716  llvm_unreachable("cannot perform hierarchy conversion in EmitAggExpr: "
717  "should have been unpacked before we got here");
718  }
719 
720  case CK_NonAtomicToAtomic:
721  case CK_AtomicToNonAtomic: {
722  bool isToAtomic = (E->getCastKind() == CK_NonAtomicToAtomic);
723 
724  // Determine the atomic and value types.
726  QualType valueType = E->getType();
727  if (isToAtomic) std::swap(atomicType, valueType);
728 
729  assert(atomicType->isAtomicType());
730  assert(CGF.getContext().hasSameUnqualifiedType(valueType,
731  atomicType->castAs<AtomicType>()->getValueType()));
732 
733  // Just recurse normally if we're ignoring the result or the
734  // atomic type doesn't change representation.
735  if (Dest.isIgnored() || !CGF.CGM.isPaddedAtomicType(atomicType)) {
736  return Visit(E->getSubExpr());
737  }
738 
739  CastKind peepholeTarget =
740  (isToAtomic ? CK_AtomicToNonAtomic : CK_NonAtomicToAtomic);
741 
742  // These two cases are reverses of each other; try to peephole them.
743  if (Expr *op = findPeephole(E->getSubExpr(), peepholeTarget)) {
744  assert(CGF.getContext().hasSameUnqualifiedType(op->getType(),
745  E->getType()) &&
746  "peephole significantly changed types?");
747  return Visit(op);
748  }
749 
750  // If we're converting an r-value of non-atomic type to an r-value
751  // of atomic type, just emit directly into the relevant sub-object.
752  if (isToAtomic) {
753  AggValueSlot valueDest = Dest;
754  if (!valueDest.isIgnored() && CGF.CGM.isPaddedAtomicType(atomicType)) {
755  // Zero-initialize. (Strictly speaking, we only need to initialize
756  // the padding at the end, but this is simpler.)
757  if (!Dest.isZeroed())
759 
760  // Build a GEP to refer to the subobject.
761  Address valueAddr =
762  CGF.Builder.CreateStructGEP(valueDest.getAddress(), 0);
763  valueDest = AggValueSlot::forAddr(valueAddr,
764  valueDest.getQualifiers(),
765  valueDest.isExternallyDestructed(),
766  valueDest.requiresGCollection(),
767  valueDest.isPotentiallyAliased(),
770  }
771 
772  CGF.EmitAggExpr(E->getSubExpr(), valueDest);
773  return;
774  }
775 
776  // Otherwise, we're converting an atomic type to a non-atomic type.
777  // Make an atomic temporary, emit into that, and then copy the value out.
778  AggValueSlot atomicSlot =
779  CGF.CreateAggTemp(atomicType, "atomic-to-nonatomic.temp");
780  CGF.EmitAggExpr(E->getSubExpr(), atomicSlot);
781 
782  Address valueAddr = Builder.CreateStructGEP(atomicSlot.getAddress(), 0);
783  RValue rvalue = RValue::getAggregate(valueAddr, atomicSlot.isVolatile());
784  return EmitFinalDestCopy(valueType, rvalue);
785  }
786 
787  case CK_LValueToRValue:
788  // If we're loading from a volatile type, force the destination
789  // into existence.
790  if (E->getSubExpr()->getType().isVolatileQualified()) {
791  EnsureDest(E->getType());
792  return Visit(E->getSubExpr());
793  }
794 
795  LLVM_FALLTHROUGH;
796 
797  case CK_NoOp:
798  case CK_UserDefinedConversion:
799  case CK_ConstructorConversion:
801  E->getType()) &&
802  "Implicit cast types must be compatible");
803  Visit(E->getSubExpr());
804  break;
805 
806  case CK_LValueBitCast:
807  llvm_unreachable("should not be emitting lvalue bitcast as rvalue");
808 
809  case CK_Dependent:
810  case CK_BitCast:
811  case CK_ArrayToPointerDecay:
812  case CK_FunctionToPointerDecay:
813  case CK_NullToPointer:
814  case CK_NullToMemberPointer:
815  case CK_BaseToDerivedMemberPointer:
816  case CK_DerivedToBaseMemberPointer:
817  case CK_MemberPointerToBoolean:
818  case CK_ReinterpretMemberPointer:
819  case CK_IntegralToPointer:
820  case CK_PointerToIntegral:
821  case CK_PointerToBoolean:
822  case CK_ToVoid:
823  case CK_VectorSplat:
824  case CK_IntegralCast:
825  case CK_BooleanToSignedIntegral:
826  case CK_IntegralToBoolean:
827  case CK_IntegralToFloating:
828  case CK_FloatingToIntegral:
829  case CK_FloatingToBoolean:
830  case CK_FloatingCast:
831  case CK_CPointerToObjCPointerCast:
832  case CK_BlockPointerToObjCPointerCast:
833  case CK_AnyPointerToBlockPointerCast:
834  case CK_ObjCObjectLValueCast:
835  case CK_FloatingRealToComplex:
836  case CK_FloatingComplexToReal:
837  case CK_FloatingComplexToBoolean:
838  case CK_FloatingComplexCast:
839  case CK_FloatingComplexToIntegralComplex:
840  case CK_IntegralRealToComplex:
841  case CK_IntegralComplexToReal:
842  case CK_IntegralComplexToBoolean:
843  case CK_IntegralComplexCast:
844  case CK_IntegralComplexToFloatingComplex:
845  case CK_ARCProduceObject:
846  case CK_ARCConsumeObject:
847  case CK_ARCReclaimReturnedObject:
848  case CK_ARCExtendBlockObject:
849  case CK_CopyAndAutoreleaseBlockObject:
850  case CK_BuiltinFnToFnPtr:
851  case CK_ZeroToOCLOpaqueType:
852  case CK_AddressSpaceConversion:
853  case CK_IntToOCLSampler:
854  case CK_FixedPointCast:
855  case CK_FixedPointToBoolean:
856  llvm_unreachable("cast kind invalid for aggregate types");
857  }
858 }
859 
860 void AggExprEmitter::VisitCallExpr(const CallExpr *E) {
861  if (E->getCallReturnType(CGF.getContext())->isReferenceType()) {
862  EmitAggLoadOfLValue(E);
863  return;
864  }
865 
866  withReturnValueSlot(E, [&](ReturnValueSlot Slot) {
867  return CGF.EmitCallExpr(E, Slot);
868  });
869 }
870 
871 void AggExprEmitter::VisitObjCMessageExpr(ObjCMessageExpr *E) {
872  withReturnValueSlot(E, [&](ReturnValueSlot Slot) {
873  return CGF.EmitObjCMessageExpr(E, Slot);
874  });
875 }
876 
877 void AggExprEmitter::VisitBinComma(const BinaryOperator *E) {
878  CGF.EmitIgnoredExpr(E->getLHS());
879  Visit(E->getRHS());
880 }
881 
882 void AggExprEmitter::VisitStmtExpr(const StmtExpr *E) {
884  CGF.EmitCompoundStmt(*E->getSubStmt(), true, Dest);
885 }
886 
891 };
892 
894  const BinaryOperator *E, llvm::Value *LHS,
896  const char *NameSuffix = "") {
897  QualType ArgTy = E->getLHS()->getType();
898  if (const ComplexType *CT = ArgTy->getAs<ComplexType>())
899  ArgTy = CT->getElementType();
900 
901  if (const auto *MPT = ArgTy->getAs<MemberPointerType>()) {
902  assert(Kind == CK_Equal &&
903  "member pointers may only be compared for equality");
905  CGF, LHS, RHS, MPT, /*IsInequality*/ false);
906  }
907 
908  // Compute the comparison instructions for the specified comparison kind.
909  struct CmpInstInfo {
910  const char *Name;
911  llvm::CmpInst::Predicate FCmp;
912  llvm::CmpInst::Predicate SCmp;
913  llvm::CmpInst::Predicate UCmp;
914  };
915  CmpInstInfo InstInfo = [&]() -> CmpInstInfo {
916  using FI = llvm::FCmpInst;
917  using II = llvm::ICmpInst;
918  switch (Kind) {
919  case CK_Less:
920  return {"cmp.lt", FI::FCMP_OLT, II::ICMP_SLT, II::ICMP_ULT};
921  case CK_Greater:
922  return {"cmp.gt", FI::FCMP_OGT, II::ICMP_SGT, II::ICMP_UGT};
923  case CK_Equal:
924  return {"cmp.eq", FI::FCMP_OEQ, II::ICMP_EQ, II::ICMP_EQ};
925  }
926  llvm_unreachable("Unrecognised CompareKind enum");
927  }();
928 
929  if (ArgTy->hasFloatingRepresentation())
930  return Builder.CreateFCmp(InstInfo.FCmp, LHS, RHS,
931  llvm::Twine(InstInfo.Name) + NameSuffix);
932  if (ArgTy->isIntegralOrEnumerationType() || ArgTy->isPointerType()) {
933  auto Inst =
934  ArgTy->hasSignedIntegerRepresentation() ? InstInfo.SCmp : InstInfo.UCmp;
935  return Builder.CreateICmp(Inst, LHS, RHS,
936  llvm::Twine(InstInfo.Name) + NameSuffix);
937  }
938 
939  llvm_unreachable("unsupported aggregate binary expression should have "
940  "already been handled");
941 }
942 
943 void AggExprEmitter::VisitBinCmp(const BinaryOperator *E) {
944  using llvm::BasicBlock;
945  using llvm::PHINode;
946  using llvm::Value;
947  assert(CGF.getContext().hasSameType(E->getLHS()->getType(),
948  E->getRHS()->getType()));
949  const ComparisonCategoryInfo &CmpInfo =
951  assert(CmpInfo.Record->isTriviallyCopyable() &&
952  "cannot copy non-trivially copyable aggregate");
953 
954  QualType ArgTy = E->getLHS()->getType();
955 
956  // TODO: Handle comparing these types.
957  if (ArgTy->isVectorType())
958  return CGF.ErrorUnsupported(
959  E, "aggregate three-way comparison with vector arguments");
960  if (!ArgTy->isIntegralOrEnumerationType() && !ArgTy->isRealFloatingType() &&
961  !ArgTy->isNullPtrType() && !ArgTy->isPointerType() &&
962  !ArgTy->isMemberPointerType() && !ArgTy->isAnyComplexType()) {
963  return CGF.ErrorUnsupported(E, "aggregate three-way comparison");
964  }
965  bool IsComplex = ArgTy->isAnyComplexType();
966 
967  // Evaluate the operands to the expression and extract their values.
968  auto EmitOperand = [&](Expr *E) -> std::pair<Value *, Value *> {
969  RValue RV = CGF.EmitAnyExpr(E);
970  if (RV.isScalar())
971  return {RV.getScalarVal(), nullptr};
972  if (RV.isAggregate())
973  return {RV.getAggregatePointer(), nullptr};
974  assert(RV.isComplex());
975  return RV.getComplexVal();
976  };
977  auto LHSValues = EmitOperand(E->getLHS()),
978  RHSValues = EmitOperand(E->getRHS());
979 
980  auto EmitCmp = [&](CompareKind K) {
981  Value *Cmp = EmitCompare(Builder, CGF, E, LHSValues.first, RHSValues.first,
982  K, IsComplex ? ".r" : "");
983  if (!IsComplex)
984  return Cmp;
985  assert(K == CompareKind::CK_Equal);
986  Value *CmpImag = EmitCompare(Builder, CGF, E, LHSValues.second,
987  RHSValues.second, K, ".i");
988  return Builder.CreateAnd(Cmp, CmpImag, "and.eq");
989  };
990  auto EmitCmpRes = [&](const ComparisonCategoryInfo::ValueInfo *VInfo) {
991  return Builder.getInt(VInfo->getIntValue());
992  };
993 
994  Value *Select;
995  if (ArgTy->isNullPtrType()) {
996  Select = EmitCmpRes(CmpInfo.getEqualOrEquiv());
997  } else if (CmpInfo.isEquality()) {
998  Select = Builder.CreateSelect(
999  EmitCmp(CK_Equal), EmitCmpRes(CmpInfo.getEqualOrEquiv()),
1000  EmitCmpRes(CmpInfo.getNonequalOrNonequiv()), "sel.eq");
1001  } else if (!CmpInfo.isPartial()) {
1002  Value *SelectOne =
1003  Builder.CreateSelect(EmitCmp(CK_Less), EmitCmpRes(CmpInfo.getLess()),
1004  EmitCmpRes(CmpInfo.getGreater()), "sel.lt");
1005  Select = Builder.CreateSelect(EmitCmp(CK_Equal),
1006  EmitCmpRes(CmpInfo.getEqualOrEquiv()),
1007  SelectOne, "sel.eq");
1008  } else {
1009  Value *SelectEq = Builder.CreateSelect(
1010  EmitCmp(CK_Equal), EmitCmpRes(CmpInfo.getEqualOrEquiv()),
1011  EmitCmpRes(CmpInfo.getUnordered()), "sel.eq");
1012  Value *SelectGT = Builder.CreateSelect(EmitCmp(CK_Greater),
1013  EmitCmpRes(CmpInfo.getGreater()),
1014  SelectEq, "sel.gt");
1015  Select = Builder.CreateSelect(
1016  EmitCmp(CK_Less), EmitCmpRes(CmpInfo.getLess()), SelectGT, "sel.lt");
1017  }
1018  // Create the return value in the destination slot.
1019  EnsureDest(E->getType());
1020  LValue DestLV = CGF.MakeAddrLValue(Dest.getAddress(), E->getType());
1021 
1022  // Emit the address of the first (and only) field in the comparison category
1023  // type, and initialize it from the constant integer value selected above.
1025  DestLV, *CmpInfo.Record->field_begin());
1026  CGF.EmitStoreThroughLValue(RValue::get(Select), FieldLV, /*IsInit*/ true);
1027 
1028  // All done! The result is in the Dest slot.
1029 }
1030 
1031 void AggExprEmitter::VisitBinaryOperator(const BinaryOperator *E) {
1032  if (E->getOpcode() == BO_PtrMemD || E->getOpcode() == BO_PtrMemI)
1033  VisitPointerToDataMemberBinaryOperator(E);
1034  else
1035  CGF.ErrorUnsupported(E, "aggregate binary expression");
1036 }
1037 
1038 void AggExprEmitter::VisitPointerToDataMemberBinaryOperator(
1039  const BinaryOperator *E) {
1041  EmitFinalDestCopy(E->getType(), LV);
1042 }
1043 
1044 /// Is the value of the given expression possibly a reference to or
1045 /// into a __block variable?
1046 static bool isBlockVarRef(const Expr *E) {
1047  // Make sure we look through parens.
1048  E = E->IgnoreParens();
1049 
1050  // Check for a direct reference to a __block variable.
1051  if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E)) {
1052  const VarDecl *var = dyn_cast<VarDecl>(DRE->getDecl());
1053  return (var && var->hasAttr<BlocksAttr>());
1054  }
1055 
1056  // More complicated stuff.
1057 
1058  // Binary operators.
1059  if (const BinaryOperator *op = dyn_cast<BinaryOperator>(E)) {
1060  // For an assignment or pointer-to-member operation, just care
1061  // about the LHS.
1062  if (op->isAssignmentOp() || op->isPtrMemOp())
1063  return isBlockVarRef(op->getLHS());
1064 
1065  // For a comma, just care about the RHS.
1066  if (op->getOpcode() == BO_Comma)
1067  return isBlockVarRef(op->getRHS());
1068 
1069  // FIXME: pointer arithmetic?
1070  return false;
1071 
1072  // Check both sides of a conditional operator.
1073  } else if (const AbstractConditionalOperator *op
1074  = dyn_cast<AbstractConditionalOperator>(E)) {
1075  return isBlockVarRef(op->getTrueExpr())
1076  || isBlockVarRef(op->getFalseExpr());
1077 
1078  // OVEs are required to support BinaryConditionalOperators.
1079  } else if (const OpaqueValueExpr *op
1080  = dyn_cast<OpaqueValueExpr>(E)) {
1081  if (const Expr *src = op->getSourceExpr())
1082  return isBlockVarRef(src);
1083 
1084  // Casts are necessary to get things like (*(int*)&var) = foo().
1085  // We don't really care about the kind of cast here, except
1086  // we don't want to look through l2r casts, because it's okay
1087  // to get the *value* in a __block variable.
1088  } else if (const CastExpr *cast = dyn_cast<CastExpr>(E)) {
1089  if (cast->getCastKind() == CK_LValueToRValue)
1090  return false;
1091  return isBlockVarRef(cast->getSubExpr());
1092 
1093  // Handle unary operators. Again, just aggressively look through
1094  // it, ignoring the operation.
1095  } else if (const UnaryOperator *uop = dyn_cast<UnaryOperator>(E)) {
1096  return isBlockVarRef(uop->getSubExpr());
1097 
1098  // Look into the base of a field access.
1099  } else if (const MemberExpr *mem = dyn_cast<MemberExpr>(E)) {
1100  return isBlockVarRef(mem->getBase());
1101 
1102  // Look into the base of a subscript.
1103  } else if (const ArraySubscriptExpr *sub = dyn_cast<ArraySubscriptExpr>(E)) {
1104  return isBlockVarRef(sub->getBase());
1105  }
1106 
1107  return false;
1108 }
1109 
1110 void AggExprEmitter::VisitBinAssign(const BinaryOperator *E) {
1111  // For an assignment to work, the value on the right has
1112  // to be compatible with the value on the left.
1113  assert(CGF.getContext().hasSameUnqualifiedType(E->getLHS()->getType(),
1114  E->getRHS()->getType())
1115  && "Invalid assignment");
1116 
1117  // If the LHS might be a __block variable, and the RHS can
1118  // potentially cause a block copy, we need to evaluate the RHS first
1119  // so that the assignment goes the right place.
1120  // This is pretty semantically fragile.
1121  if (isBlockVarRef(E->getLHS()) &&
1122  E->getRHS()->HasSideEffects(CGF.getContext())) {
1123  // Ensure that we have a destination, and evaluate the RHS into that.
1124  EnsureDest(E->getRHS()->getType());
1125  Visit(E->getRHS());
1126 
1127  // Now emit the LHS and copy into it.
1129 
1130  // That copy is an atomic copy if the LHS is atomic.
1131  if (LHS.getType()->isAtomicType() ||
1133  CGF.EmitAtomicStore(Dest.asRValue(), LHS, /*isInit*/ false);
1134  return;
1135  }
1136 
1137  EmitCopy(E->getLHS()->getType(),
1139  needsGC(E->getLHS()->getType()),
1142  Dest);
1143  return;
1144  }
1145 
1146  LValue LHS = CGF.EmitLValue(E->getLHS());
1147 
1148  // If we have an atomic type, evaluate into the destination and then
1149  // do an atomic copy.
1150  if (LHS.getType()->isAtomicType() ||
1152  EnsureDest(E->getRHS()->getType());
1153  Visit(E->getRHS());
1154  CGF.EmitAtomicStore(Dest.asRValue(), LHS, /*isInit*/ false);
1155  return;
1156  }
1157 
1158  // Codegen the RHS so that it stores directly into the LHS.
1159  AggValueSlot LHSSlot =
1161  needsGC(E->getLHS()->getType()),
1164  // A non-volatile aggregate destination might have volatile member.
1165  if (!LHSSlot.isVolatile() &&
1166  CGF.hasVolatileMember(E->getLHS()->getType()))
1167  LHSSlot.setVolatile(true);
1168 
1169  CGF.EmitAggExpr(E->getRHS(), LHSSlot);
1170 
1171  // Copy into the destination if the assignment isn't ignored.
1172  EmitFinalDestCopy(E->getType(), LHS);
1173 }
1174 
1175 void AggExprEmitter::
1176 VisitAbstractConditionalOperator(const AbstractConditionalOperator *E) {
1177  llvm::BasicBlock *LHSBlock = CGF.createBasicBlock("cond.true");
1178  llvm::BasicBlock *RHSBlock = CGF.createBasicBlock("cond.false");
1179  llvm::BasicBlock *ContBlock = CGF.createBasicBlock("cond.end");
1180 
1181  // Bind the common expression if necessary.
1182  CodeGenFunction::OpaqueValueMapping binding(CGF, E);
1183 
1185  CGF.EmitBranchOnBoolExpr(E->getCond(), LHSBlock, RHSBlock,
1186  CGF.getProfileCount(E));
1187 
1188  // Save whether the destination's lifetime is externally managed.
1189  bool isExternallyDestructed = Dest.isExternallyDestructed();
1190 
1191  eval.begin(CGF);
1192  CGF.EmitBlock(LHSBlock);
1193  CGF.incrementProfileCounter(E);
1194  Visit(E->getTrueExpr());
1195  eval.end(CGF);
1196 
1197  assert(CGF.HaveInsertPoint() && "expression evaluation ended with no IP!");
1198  CGF.Builder.CreateBr(ContBlock);
1199 
1200  // If the result of an agg expression is unused, then the emission
1201  // of the LHS might need to create a destination slot. That's fine
1202  // with us, and we can safely emit the RHS into the same slot, but
1203  // we shouldn't claim that it's already being destructed.
1204  Dest.setExternallyDestructed(isExternallyDestructed);
1205 
1206  eval.begin(CGF);
1207  CGF.EmitBlock(RHSBlock);
1208  Visit(E->getFalseExpr());
1209  eval.end(CGF);
1210 
1211  CGF.EmitBlock(ContBlock);
1212 }
1213 
1214 void AggExprEmitter::VisitChooseExpr(const ChooseExpr *CE) {
1215  Visit(CE->getChosenSubExpr());
1216 }
1217 
1218 void AggExprEmitter::VisitVAArgExpr(VAArgExpr *VE) {
1219  Address ArgValue = Address::invalid();
1220  Address ArgPtr = CGF.EmitVAArg(VE, ArgValue);
1221 
1222  // If EmitVAArg fails, emit an error.
1223  if (!ArgPtr.isValid()) {
1224  CGF.ErrorUnsupported(VE, "aggregate va_arg expression");
1225  return;
1226  }
1227 
1228  EmitFinalDestCopy(VE->getType(), CGF.MakeAddrLValue(ArgPtr, VE->getType()));
1229 }
1230 
1231 void AggExprEmitter::VisitCXXBindTemporaryExpr(CXXBindTemporaryExpr *E) {
1232  // Ensure that we have a slot, but if we already do, remember
1233  // whether it was externally destructed.
1234  bool wasExternallyDestructed = Dest.isExternallyDestructed();
1235  EnsureDest(E->getType());
1236 
1237  // We're going to push a destructor if there isn't already one.
1238  Dest.setExternallyDestructed();
1239 
1240  Visit(E->getSubExpr());
1241 
1242  // Push that destructor we promised.
1243  if (!wasExternallyDestructed)
1244  CGF.EmitCXXTemporary(E->getTemporary(), E->getType(), Dest.getAddress());
1245 }
1246 
1247 void
1248 AggExprEmitter::VisitCXXConstructExpr(const CXXConstructExpr *E) {
1249  AggValueSlot Slot = EnsureSlot(E->getType());
1250  CGF.EmitCXXConstructExpr(E, Slot);
1251 }
1252 
1253 void AggExprEmitter::VisitCXXInheritedCtorInitExpr(
1254  const CXXInheritedCtorInitExpr *E) {
1255  AggValueSlot Slot = EnsureSlot(E->getType());
1257  E->getConstructor(), E->constructsVBase(), Slot.getAddress(),
1258  E->inheritedFromVBase(), E);
1259 }
1260 
1261 void
1262 AggExprEmitter::VisitLambdaExpr(LambdaExpr *E) {
1263  AggValueSlot Slot = EnsureSlot(E->getType());
1264  LValue SlotLV = CGF.MakeAddrLValue(Slot.getAddress(), E->getType());
1265 
1266  // We'll need to enter cleanup scopes in case any of the element
1267  // initializers throws an exception.
1269  llvm::Instruction *CleanupDominator = nullptr;
1270 
1273  e = E->capture_init_end();
1274  i != e; ++i, ++CurField) {
1275  // Emit initialization
1276  LValue LV = CGF.EmitLValueForFieldInitialization(SlotLV, *CurField);
1277  if (CurField->hasCapturedVLAType()) {
1278  CGF.EmitLambdaVLACapture(CurField->getCapturedVLAType(), LV);
1279  continue;
1280  }
1281 
1282  EmitInitializationToLValue(*i, LV);
1283 
1284  // Push a destructor if necessary.
1285  if (QualType::DestructionKind DtorKind =
1286  CurField->getType().isDestructedType()) {
1287  assert(LV.isSimple());
1288  if (CGF.needsEHCleanup(DtorKind)) {
1289  if (!CleanupDominator)
1290  CleanupDominator = CGF.Builder.CreateAlignedLoad(
1291  CGF.Int8Ty,
1292  llvm::Constant::getNullValue(CGF.Int8PtrTy),
1293  CharUnits::One()); // placeholder
1294 
1295  CGF.pushDestroy(EHCleanup, LV.getAddress(), CurField->getType(),
1296  CGF.getDestroyer(DtorKind), false);
1297  Cleanups.push_back(CGF.EHStack.stable_begin());
1298  }
1299  }
1300  }
1301 
1302  // Deactivate all the partial cleanups in reverse order, which
1303  // generally means popping them.
1304  for (unsigned i = Cleanups.size(); i != 0; --i)
1305  CGF.DeactivateCleanupBlock(Cleanups[i-1], CleanupDominator);
1306 
1307  // Destroy the placeholder if we made one.
1308  if (CleanupDominator)
1309  CleanupDominator->eraseFromParent();
1310 }
1311 
1312 void AggExprEmitter::VisitExprWithCleanups(ExprWithCleanups *E) {
1313  CGF.enterFullExpression(E);
1314  CodeGenFunction::RunCleanupsScope cleanups(CGF);
1315  Visit(E->getSubExpr());
1316 }
1317 
1318 void AggExprEmitter::VisitCXXScalarValueInitExpr(CXXScalarValueInitExpr *E) {
1319  QualType T = E->getType();
1320  AggValueSlot Slot = EnsureSlot(T);
1321  EmitNullInitializationToLValue(CGF.MakeAddrLValue(Slot.getAddress(), T));
1322 }
1323 
1324 void AggExprEmitter::VisitImplicitValueInitExpr(ImplicitValueInitExpr *E) {
1325  QualType T = E->getType();
1326  AggValueSlot Slot = EnsureSlot(T);
1327  EmitNullInitializationToLValue(CGF.MakeAddrLValue(Slot.getAddress(), T));
1328 }
1329 
1330 /// isSimpleZero - If emitting this value will obviously just cause a store of
1331 /// zero to memory, return true. This can return false if uncertain, so it just
1332 /// handles simple cases.
1333 static bool isSimpleZero(const Expr *E, CodeGenFunction &CGF) {
1334  E = E->IgnoreParens();
1335 
1336  // 0
1337  if (const IntegerLiteral *IL = dyn_cast<IntegerLiteral>(E))
1338  return IL->getValue() == 0;
1339  // +0.0
1340  if (const FloatingLiteral *FL = dyn_cast<FloatingLiteral>(E))
1341  return FL->getValue().isPosZero();
1342  // int()
1343  if ((isa<ImplicitValueInitExpr>(E) || isa<CXXScalarValueInitExpr>(E)) &&
1344  CGF.getTypes().isZeroInitializable(E->getType()))
1345  return true;
1346  // (int*)0 - Null pointer expressions.
1347  if (const CastExpr *ICE = dyn_cast<CastExpr>(E))
1348  return ICE->getCastKind() == CK_NullToPointer &&
1350  // '\0'
1351  if (const CharacterLiteral *CL = dyn_cast<CharacterLiteral>(E))
1352  return CL->getValue() == 0;
1353 
1354  // Otherwise, hard case: conservatively return false.
1355  return false;
1356 }
1357 
1358 
1359 void
1360 AggExprEmitter::EmitInitializationToLValue(Expr *E, LValue LV) {
1361  QualType type = LV.getType();
1362  // FIXME: Ignore result?
1363  // FIXME: Are initializers affected by volatile?
1364  if (Dest.isZeroed() && isSimpleZero(E, CGF)) {
1365  // Storing "i32 0" to a zero'd memory location is a noop.
1366  return;
1367  } else if (isa<ImplicitValueInitExpr>(E) || isa<CXXScalarValueInitExpr>(E)) {
1368  return EmitNullInitializationToLValue(LV);
1369  } else if (isa<NoInitExpr>(E)) {
1370  // Do nothing.
1371  return;
1372  } else if (type->isReferenceType()) {
1373  RValue RV = CGF.EmitReferenceBindingToExpr(E);
1374  return CGF.EmitStoreThroughLValue(RV, LV);
1375  }
1376 
1377  switch (CGF.getEvaluationKind(type)) {
1378  case TEK_Complex:
1379  CGF.EmitComplexExprIntoLValue(E, LV, /*isInit*/ true);
1380  return;
1381  case TEK_Aggregate:
1387  Dest.isZeroed()));
1388  return;
1389  case TEK_Scalar:
1390  if (LV.isSimple()) {
1391  CGF.EmitScalarInit(E, /*D=*/nullptr, LV, /*Captured=*/false);
1392  } else {
1394  }
1395  return;
1396  }
1397  llvm_unreachable("bad evaluation kind");
1398 }
1399 
1400 void AggExprEmitter::EmitNullInitializationToLValue(LValue lv) {
1401  QualType type = lv.getType();
1402 
1403  // If the destination slot is already zeroed out before the aggregate is
1404  // copied into it, we don't have to emit any zeros here.
1405  if (Dest.isZeroed() && CGF.getTypes().isZeroInitializable(type))
1406  return;
1407 
1408  if (CGF.hasScalarEvaluationKind(type)) {
1409  // For non-aggregates, we can store the appropriate null constant.
1410  llvm::Value *null = CGF.CGM.EmitNullConstant(type);
1411  // Note that the following is not equivalent to
1412  // EmitStoreThroughBitfieldLValue for ARC types.
1413  if (lv.isBitField()) {
1415  } else {
1416  assert(lv.isSimple());
1417  CGF.EmitStoreOfScalar(null, lv, /* isInitialization */ true);
1418  }
1419  } else {
1420  // There's a potential optimization opportunity in combining
1421  // memsets; that would be easy for arrays, but relatively
1422  // difficult for structures with the current code.
1423  CGF.EmitNullInitialization(lv.getAddress(), lv.getType());
1424  }
1425 }
1426 
1427 void AggExprEmitter::VisitInitListExpr(InitListExpr *E) {
1428 #if 0
1429  // FIXME: Assess perf here? Figure out what cases are worth optimizing here
1430  // (Length of globals? Chunks of zeroed-out space?).
1431  //
1432  // If we can, prefer a copy from a global; this is a lot less code for long
1433  // globals, and it's easier for the current optimizers to analyze.
1434  if (llvm::Constant* C = CGF.CGM.EmitConstantExpr(E, E->getType(), &CGF)) {
1435  llvm::GlobalVariable* GV =
1436  new llvm::GlobalVariable(CGF.CGM.getModule(), C->getType(), true,
1438  EmitFinalDestCopy(E->getType(), CGF.MakeAddrLValue(GV, E->getType()));
1439  return;
1440  }
1441 #endif
1442  if (E->hadArrayRangeDesignator())
1443  CGF.ErrorUnsupported(E, "GNU array range designator extension");
1444 
1445  if (E->isTransparent())
1446  return Visit(E->getInit(0));
1447 
1448  AggValueSlot Dest = EnsureSlot(E->getType());
1449 
1450  LValue DestLV = CGF.MakeAddrLValue(Dest.getAddress(), E->getType());
1451 
1452  // Handle initialization of an array.
1453  if (E->getType()->isArrayType()) {
1454  auto AType = cast<llvm::ArrayType>(Dest.getAddress().getElementType());
1455  EmitArrayInit(Dest.getAddress(), AType, E->getType(), E);
1456  return;
1457  }
1458 
1459  assert(E->getType()->isRecordType() && "Only support structs/unions here!");
1460 
1461  // Do struct initialization; this code just sets each individual member
1462  // to the approprate value. This makes bitfield support automatic;
1463  // the disadvantage is that the generated code is more difficult for
1464  // the optimizer, especially with bitfields.
1465  unsigned NumInitElements = E->getNumInits();
1466  RecordDecl *record = E->getType()->castAs<RecordType>()->getDecl();
1467 
1468  // We'll need to enter cleanup scopes in case any of the element
1469  // initializers throws an exception.
1471  llvm::Instruction *cleanupDominator = nullptr;
1472 
1473  unsigned curInitIndex = 0;
1474 
1475  // Emit initialization of base classes.
1476  if (auto *CXXRD = dyn_cast<CXXRecordDecl>(record)) {
1477  assert(E->getNumInits() >= CXXRD->getNumBases() &&
1478  "missing initializer for base class");
1479  for (auto &Base : CXXRD->bases()) {
1480  assert(!Base.isVirtual() && "should not see vbases here");
1481  auto *BaseRD = Base.getType()->getAsCXXRecordDecl();
1483  Dest.getAddress(), CXXRD, BaseRD,
1484  /*isBaseVirtual*/ false);
1486  V, Qualifiers(),
1490  CGF.overlapForBaseInit(CXXRD, BaseRD, Base.isVirtual()));
1491  CGF.EmitAggExpr(E->getInit(curInitIndex++), AggSlot);
1492 
1493  if (QualType::DestructionKind dtorKind =
1494  Base.getType().isDestructedType()) {
1495  CGF.pushDestroy(dtorKind, V, Base.getType());
1496  cleanups.push_back(CGF.EHStack.stable_begin());
1497  }
1498  }
1499  }
1500 
1501  // Prepare a 'this' for CXXDefaultInitExprs.
1503 
1504  if (record->isUnion()) {
1505  // Only initialize one field of a union. The field itself is
1506  // specified by the initializer list.
1507  if (!E->getInitializedFieldInUnion()) {
1508  // Empty union; we have nothing to do.
1509 
1510 #ifndef NDEBUG
1511  // Make sure that it's really an empty and not a failure of
1512  // semantic analysis.
1513  for (const auto *Field : record->fields())
1514  assert(Field->isUnnamedBitfield() && "Only unnamed bitfields allowed");
1515 #endif
1516  return;
1517  }
1518 
1519  // FIXME: volatility
1520  FieldDecl *Field = E->getInitializedFieldInUnion();
1521 
1522  LValue FieldLoc = CGF.EmitLValueForFieldInitialization(DestLV, Field);
1523  if (NumInitElements) {
1524  // Store the initializer into the field
1525  EmitInitializationToLValue(E->getInit(0), FieldLoc);
1526  } else {
1527  // Default-initialize to null.
1528  EmitNullInitializationToLValue(FieldLoc);
1529  }
1530 
1531  return;
1532  }
1533 
1534  // Here we iterate over the fields; this makes it simpler to both
1535  // default-initialize fields and skip over unnamed fields.
1536  for (const auto *field : record->fields()) {
1537  // We're done once we hit the flexible array member.
1538  if (field->getType()->isIncompleteArrayType())
1539  break;
1540 
1541  // Always skip anonymous bitfields.
1542  if (field->isUnnamedBitfield())
1543  continue;
1544 
1545  // We're done if we reach the end of the explicit initializers, we
1546  // have a zeroed object, and the rest of the fields are
1547  // zero-initializable.
1548  if (curInitIndex == NumInitElements && Dest.isZeroed() &&
1549  CGF.getTypes().isZeroInitializable(E->getType()))
1550  break;
1551 
1552 
1553  LValue LV = CGF.EmitLValueForFieldInitialization(DestLV, field);
1554  // We never generate write-barries for initialized fields.
1555  LV.setNonGC(true);
1556 
1557  if (curInitIndex < NumInitElements) {
1558  // Store the initializer into the field.
1559  EmitInitializationToLValue(E->getInit(curInitIndex++), LV);
1560  } else {
1561  // We're out of initializers; default-initialize to null
1562  EmitNullInitializationToLValue(LV);
1563  }
1564 
1565  // Push a destructor if necessary.
1566  // FIXME: if we have an array of structures, all explicitly
1567  // initialized, we can end up pushing a linear number of cleanups.
1568  bool pushedCleanup = false;
1569  if (QualType::DestructionKind dtorKind
1570  = field->getType().isDestructedType()) {
1571  assert(LV.isSimple());
1572  if (CGF.needsEHCleanup(dtorKind)) {
1573  if (!cleanupDominator)
1574  cleanupDominator = CGF.Builder.CreateAlignedLoad(
1575  CGF.Int8Ty,
1576  llvm::Constant::getNullValue(CGF.Int8PtrTy),
1577  CharUnits::One()); // placeholder
1578 
1579  CGF.pushDestroy(EHCleanup, LV.getAddress(), field->getType(),
1580  CGF.getDestroyer(dtorKind), false);
1581  cleanups.push_back(CGF.EHStack.stable_begin());
1582  pushedCleanup = true;
1583  }
1584  }
1585 
1586  // If the GEP didn't get used because of a dead zero init or something
1587  // else, clean it up for -O0 builds and general tidiness.
1588  if (!pushedCleanup && LV.isSimple())
1589  if (llvm::GetElementPtrInst *GEP =
1590  dyn_cast<llvm::GetElementPtrInst>(LV.getPointer()))
1591  if (GEP->use_empty())
1592  GEP->eraseFromParent();
1593  }
1594 
1595  // Deactivate all the partial cleanups in reverse order, which
1596  // generally means popping them.
1597  for (unsigned i = cleanups.size(); i != 0; --i)
1598  CGF.DeactivateCleanupBlock(cleanups[i-1], cleanupDominator);
1599 
1600  // Destroy the placeholder if we made one.
1601  if (cleanupDominator)
1602  cleanupDominator->eraseFromParent();
1603 }
1604 
1605 void AggExprEmitter::VisitArrayInitLoopExpr(const ArrayInitLoopExpr *E,
1606  llvm::Value *outerBegin) {
1607  // Emit the common subexpression.
1609 
1610  Address destPtr = EnsureSlot(E->getType()).getAddress();
1611  uint64_t numElements = E->getArraySize().getZExtValue();
1612 
1613  if (!numElements)
1614  return;
1615 
1616  // destPtr is an array*. Construct an elementType* by drilling down a level.
1617  llvm::Value *zero = llvm::ConstantInt::get(CGF.SizeTy, 0);
1618  llvm::Value *indices[] = {zero, zero};
1619  llvm::Value *begin = Builder.CreateInBoundsGEP(destPtr.getPointer(), indices,
1620  "arrayinit.begin");
1621 
1622  // Prepare to special-case multidimensional array initialization: we avoid
1623  // emitting multiple destructor loops in that case.
1624  if (!outerBegin)
1625  outerBegin = begin;
1626  ArrayInitLoopExpr *InnerLoop = dyn_cast<ArrayInitLoopExpr>(E->getSubExpr());
1627 
1628  QualType elementType =
1629  CGF.getContext().getAsArrayType(E->getType())->getElementType();
1630  CharUnits elementSize = CGF.getContext().getTypeSizeInChars(elementType);
1631  CharUnits elementAlign =
1632  destPtr.getAlignment().alignmentOfArrayElement(elementSize);
1633 
1634  llvm::BasicBlock *entryBB = Builder.GetInsertBlock();
1635  llvm::BasicBlock *bodyBB = CGF.createBasicBlock("arrayinit.body");
1636 
1637  // Jump into the body.
1638  CGF.EmitBlock(bodyBB);
1639  llvm::PHINode *index =
1640  Builder.CreatePHI(zero->getType(), 2, "arrayinit.index");
1641  index->addIncoming(zero, entryBB);
1642  llvm::Value *element = Builder.CreateInBoundsGEP(begin, index);
1643 
1644  // Prepare for a cleanup.
1645  QualType::DestructionKind dtorKind = elementType.isDestructedType();
1647  if (CGF.needsEHCleanup(dtorKind) && !InnerLoop) {
1648  if (outerBegin->getType() != element->getType())
1649  outerBegin = Builder.CreateBitCast(outerBegin, element->getType());
1650  CGF.pushRegularPartialArrayCleanup(outerBegin, element, elementType,
1651  elementAlign,
1652  CGF.getDestroyer(dtorKind));
1653  cleanup = CGF.EHStack.stable_begin();
1654  } else {
1655  dtorKind = QualType::DK_none;
1656  }
1657 
1658  // Emit the actual filler expression.
1659  {
1660  // Temporaries created in an array initialization loop are destroyed
1661  // at the end of each iteration.
1662  CodeGenFunction::RunCleanupsScope CleanupsScope(CGF);
1664  LValue elementLV =
1665  CGF.MakeAddrLValue(Address(element, elementAlign), elementType);
1666 
1667  if (InnerLoop) {
1668  // If the subexpression is an ArrayInitLoopExpr, share its cleanup.
1669  auto elementSlot = AggValueSlot::forLValue(
1670  elementLV, AggValueSlot::IsDestructed,
1674  AggExprEmitter(CGF, elementSlot, false)
1675  .VisitArrayInitLoopExpr(InnerLoop, outerBegin);
1676  } else
1677  EmitInitializationToLValue(E->getSubExpr(), elementLV);
1678  }
1679 
1680  // Move on to the next element.
1681  llvm::Value *nextIndex = Builder.CreateNUWAdd(
1682  index, llvm::ConstantInt::get(CGF.SizeTy, 1), "arrayinit.next");
1683  index->addIncoming(nextIndex, Builder.GetInsertBlock());
1684 
1685  // Leave the loop if we're done.
1686  llvm::Value *done = Builder.CreateICmpEQ(
1687  nextIndex, llvm::ConstantInt::get(CGF.SizeTy, numElements),
1688  "arrayinit.done");
1689  llvm::BasicBlock *endBB = CGF.createBasicBlock("arrayinit.end");
1690  Builder.CreateCondBr(done, endBB, bodyBB);
1691 
1692  CGF.EmitBlock(endBB);
1693 
1694  // Leave the partial-array cleanup if we entered one.
1695  if (dtorKind)
1696  CGF.DeactivateCleanupBlock(cleanup, index);
1697 }
1698 
1699 void AggExprEmitter::VisitDesignatedInitUpdateExpr(DesignatedInitUpdateExpr *E) {
1700  AggValueSlot Dest = EnsureSlot(E->getType());
1701 
1702  LValue DestLV = CGF.MakeAddrLValue(Dest.getAddress(), E->getType());
1703  EmitInitializationToLValue(E->getBase(), DestLV);
1704  VisitInitListExpr(E->getUpdater());
1705 }
1706 
1707 //===----------------------------------------------------------------------===//
1708 // Entry Points into this File
1709 //===----------------------------------------------------------------------===//
1710 
1711 /// GetNumNonZeroBytesInInit - Get an approximate count of the number of
1712 /// non-zero bytes that will be stored when outputting the initializer for the
1713 /// specified initializer expression.
1715  E = E->IgnoreParens();
1716 
1717  // 0 and 0.0 won't require any non-zero stores!
1718  if (isSimpleZero(E, CGF)) return CharUnits::Zero();
1719 
1720  // If this is an initlist expr, sum up the size of sizes of the (present)
1721  // elements. If this is something weird, assume the whole thing is non-zero.
1722  const InitListExpr *ILE = dyn_cast<InitListExpr>(E);
1723  while (ILE && ILE->isTransparent())
1724  ILE = dyn_cast<InitListExpr>(ILE->getInit(0));
1725  if (!ILE || !CGF.getTypes().isZeroInitializable(ILE->getType()))
1726  return CGF.getContext().getTypeSizeInChars(E->getType());
1727 
1728  // InitListExprs for structs have to be handled carefully. If there are
1729  // reference members, we need to consider the size of the reference, not the
1730  // referencee. InitListExprs for unions and arrays can't have references.
1731  if (const RecordType *RT = E->getType()->getAs<RecordType>()) {
1732  if (!RT->isUnionType()) {
1733  RecordDecl *SD = E->getType()->getAs<RecordType>()->getDecl();
1734  CharUnits NumNonZeroBytes = CharUnits::Zero();
1735 
1736  unsigned ILEElement = 0;
1737  if (auto *CXXRD = dyn_cast<CXXRecordDecl>(SD))
1738  while (ILEElement != CXXRD->getNumBases())
1739  NumNonZeroBytes +=
1740  GetNumNonZeroBytesInInit(ILE->getInit(ILEElement++), CGF);
1741  for (const auto *Field : SD->fields()) {
1742  // We're done once we hit the flexible array member or run out of
1743  // InitListExpr elements.
1744  if (Field->getType()->isIncompleteArrayType() ||
1745  ILEElement == ILE->getNumInits())
1746  break;
1747  if (Field->isUnnamedBitfield())
1748  continue;
1749 
1750  const Expr *E = ILE->getInit(ILEElement++);
1751 
1752  // Reference values are always non-null and have the width of a pointer.
1753  if (Field->getType()->isReferenceType())
1754  NumNonZeroBytes += CGF.getContext().toCharUnitsFromBits(
1755  CGF.getTarget().getPointerWidth(0));
1756  else
1757  NumNonZeroBytes += GetNumNonZeroBytesInInit(E, CGF);
1758  }
1759 
1760  return NumNonZeroBytes;
1761  }
1762  }
1763 
1764 
1765  CharUnits NumNonZeroBytes = CharUnits::Zero();
1766  for (unsigned i = 0, e = ILE->getNumInits(); i != e; ++i)
1767  NumNonZeroBytes += GetNumNonZeroBytesInInit(ILE->getInit(i), CGF);
1768  return NumNonZeroBytes;
1769 }
1770 
1771 /// CheckAggExprForMemSetUse - If the initializer is large and has a lot of
1772 /// zeros in it, emit a memset and avoid storing the individual zeros.
1773 ///
1774 static void CheckAggExprForMemSetUse(AggValueSlot &Slot, const Expr *E,
1775  CodeGenFunction &CGF) {
1776  // If the slot is already known to be zeroed, nothing to do. Don't mess with
1777  // volatile stores.
1778  if (Slot.isZeroed() || Slot.isVolatile() || !Slot.getAddress().isValid())
1779  return;
1780 
1781  // C++ objects with a user-declared constructor don't need zero'ing.
1782  if (CGF.getLangOpts().CPlusPlus)
1783  if (const RecordType *RT = CGF.getContext()
1784  .getBaseElementType(E->getType())->getAs<RecordType>()) {
1785  const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl());
1786  if (RD->hasUserDeclaredConstructor())
1787  return;
1788  }
1789 
1790  // If the type is 16-bytes or smaller, prefer individual stores over memset.
1791  CharUnits Size = Slot.getPreferredSize(CGF.getContext(), E->getType());
1792  if (Size <= CharUnits::fromQuantity(16))
1793  return;
1794 
1795  // Check to see if over 3/4 of the initializer are known to be zero. If so,
1796  // we prefer to emit memset + individual stores for the rest.
1797  CharUnits NumNonZeroBytes = GetNumNonZeroBytesInInit(E, CGF);
1798  if (NumNonZeroBytes*4 > Size)
1799  return;
1800 
1801  // Okay, it seems like a good idea to use an initial memset, emit the call.
1802  llvm::Constant *SizeVal = CGF.Builder.getInt64(Size.getQuantity());
1803 
1804  Address Loc = Slot.getAddress();
1805  Loc = CGF.Builder.CreateElementBitCast(Loc, CGF.Int8Ty);
1806  CGF.Builder.CreateMemSet(Loc, CGF.Builder.getInt8(0), SizeVal, false);
1807 
1808  // Tell the AggExprEmitter that the slot is known zero.
1809  Slot.setZeroed();
1810 }
1811 
1812 
1813 
1814 
1815 /// EmitAggExpr - Emit the computation of the specified expression of aggregate
1816 /// type. The result is computed into DestPtr. Note that if DestPtr is null,
1817 /// the value of the aggregate expression is not needed. If VolatileDest is
1818 /// true, DestPtr cannot be 0.
1820  assert(E && hasAggregateEvaluationKind(E->getType()) &&
1821  "Invalid aggregate expression to emit");
1822  assert((Slot.getAddress().isValid() || Slot.isIgnored()) &&
1823  "slot has bits but no address");
1824 
1825  // Optimize the slot if possible.
1826  CheckAggExprForMemSetUse(Slot, E, *this);
1827 
1828  AggExprEmitter(*this, Slot, Slot.isIgnored()).Visit(const_cast<Expr*>(E));
1829 }
1830 
1832  assert(hasAggregateEvaluationKind(E->getType()) && "Invalid argument!");
1833  Address Temp = CreateMemTemp(E->getType());
1834  LValue LV = MakeAddrLValue(Temp, E->getType());
1839  return LV;
1840 }
1841 
1843  const CXXRecordDecl *RD, const CXXRecordDecl *BaseRD, bool IsVirtual) {
1844  // Virtual bases are initialized first, in address order, so there's never
1845  // any overlap during their initialization.
1846  //
1847  // FIXME: Under P0840, this is no longer true: the tail padding of a vbase
1848  // of a field could be reused by a vbase of a containing class.
1849  if (IsVirtual)
1851 
1852  // If the base class is laid out entirely within the nvsize of the derived
1853  // class, its tail padding cannot yet be initialized, so we can issue
1854  // stores at the full width of the base class.
1855  const ASTRecordLayout &Layout = getContext().getASTRecordLayout(RD);
1856  if (Layout.getBaseClassOffset(BaseRD) +
1857  getContext().getASTRecordLayout(BaseRD).getSize() <=
1858  Layout.getNonVirtualSize())
1860 
1861  // The tail padding may contain values we need to preserve.
1862  return AggValueSlot::MayOverlap;
1863 }
1864 
1866  AggValueSlot::Overlap_t MayOverlap,
1867  bool isVolatile) {
1868  assert(!Ty->isAnyComplexType() && "Shouldn't happen for complex");
1869 
1870  Address DestPtr = Dest.getAddress();
1871  Address SrcPtr = Src.getAddress();
1872 
1873  if (getLangOpts().CPlusPlus) {
1874  if (const RecordType *RT = Ty->getAs<RecordType>()) {
1875  CXXRecordDecl *Record = cast<CXXRecordDecl>(RT->getDecl());
1876  assert((Record->hasTrivialCopyConstructor() ||
1877  Record->hasTrivialCopyAssignment() ||
1878  Record->hasTrivialMoveConstructor() ||
1879  Record->hasTrivialMoveAssignment() ||
1880  Record->isUnion()) &&
1881  "Trying to aggregate-copy a type without a trivial copy/move "
1882  "constructor or assignment operator");
1883  // Ignore empty classes in C++.
1884  if (Record->isEmpty())
1885  return;
1886  }
1887  }
1888 
1889  // Aggregate assignment turns into llvm.memcpy. This is almost valid per
1890  // C99 6.5.16.1p3, which states "If the value being stored in an object is
1891  // read from another object that overlaps in anyway the storage of the first
1892  // object, then the overlap shall be exact and the two objects shall have
1893  // qualified or unqualified versions of a compatible type."
1894  //
1895  // memcpy is not defined if the source and destination pointers are exactly
1896  // equal, but other compilers do this optimization, and almost every memcpy
1897  // implementation handles this case safely. If there is a libc that does not
1898  // safely handle this, we can add a target hook.
1899 
1900  // Get data size info for this aggregate. Don't copy the tail padding if this
1901  // might be a potentially-overlapping subobject, since the tail padding might
1902  // be occupied by a different object. Otherwise, copying it is fine.
1903  std::pair<CharUnits, CharUnits> TypeInfo;
1904  if (MayOverlap)
1905  TypeInfo = getContext().getTypeInfoDataSizeInChars(Ty);
1906  else
1907  TypeInfo = getContext().getTypeInfoInChars(Ty);
1908 
1909  llvm::Value *SizeVal = nullptr;
1910  if (TypeInfo.first.isZero()) {
1911  // But note that getTypeInfo returns 0 for a VLA.
1912  if (auto *VAT = dyn_cast_or_null<VariableArrayType>(
1913  getContext().getAsArrayType(Ty))) {
1914  QualType BaseEltTy;
1915  SizeVal = emitArrayLength(VAT, BaseEltTy, DestPtr);
1916  TypeInfo = getContext().getTypeInfoInChars(BaseEltTy);
1917  assert(!TypeInfo.first.isZero());
1918  SizeVal = Builder.CreateNUWMul(
1919  SizeVal,
1920  llvm::ConstantInt::get(SizeTy, TypeInfo.first.getQuantity()));
1921  }
1922  }
1923  if (!SizeVal) {
1924  SizeVal = llvm::ConstantInt::get(SizeTy, TypeInfo.first.getQuantity());
1925  }
1926 
1927  // FIXME: If we have a volatile struct, the optimizer can remove what might
1928  // appear to be `extra' memory ops:
1929  //
1930  // volatile struct { int i; } a, b;
1931  //
1932  // int main() {
1933  // a = b;
1934  // a = b;
1935  // }
1936  //
1937  // we need to use a different call here. We use isVolatile to indicate when
1938  // either the source or the destination is volatile.
1939 
1940  DestPtr = Builder.CreateElementBitCast(DestPtr, Int8Ty);
1941  SrcPtr = Builder.CreateElementBitCast(SrcPtr, Int8Ty);
1942 
1943  // Don't do any of the memmove_collectable tests if GC isn't set.
1944  if (CGM.getLangOpts().getGC() == LangOptions::NonGC) {
1945  // fall through
1946  } else if (const RecordType *RecordTy = Ty->getAs<RecordType>()) {
1947  RecordDecl *Record = RecordTy->getDecl();
1948  if (Record->hasObjectMember()) {
1949  CGM.getObjCRuntime().EmitGCMemmoveCollectable(*this, DestPtr, SrcPtr,
1950  SizeVal);
1951  return;
1952  }
1953  } else if (Ty->isArrayType()) {
1954  QualType BaseType = getContext().getBaseElementType(Ty);
1955  if (const RecordType *RecordTy = BaseType->getAs<RecordType>()) {
1956  if (RecordTy->getDecl()->hasObjectMember()) {
1957  CGM.getObjCRuntime().EmitGCMemmoveCollectable(*this, DestPtr, SrcPtr,
1958  SizeVal);
1959  return;
1960  }
1961  }
1962  }
1963 
1964  auto Inst = Builder.CreateMemCpy(DestPtr, SrcPtr, SizeVal, isVolatile);
1965 
1966  // Determine the metadata to describe the position of any padding in this
1967  // memcpy, as well as the TBAA tags for the members of the struct, in case
1968  // the optimizer wishes to expand it in to scalar memory operations.
1969  if (llvm::MDNode *TBAAStructTag = CGM.getTBAAStructInfo(Ty))
1970  Inst->setMetadata(llvm::LLVMContext::MD_tbaa_struct, TBAAStructTag);
1971 
1972  if (CGM.getCodeGenOpts().NewStructPathTBAA) {
1973  TBAAAccessInfo TBAAInfo = CGM.mergeTBAAInfoForMemoryTransfer(
1974  Dest.getTBAAInfo(), Src.getTBAAInfo());
1975  CGM.DecorateInstructionWithTBAA(Inst, TBAAInfo);
1976  }
1977 }
bool isAggregate() const
Definition: CGValue.h:53
const llvm::DataLayout & getDataLayout() const
const Expr * getSubExpr() const
Definition: Expr.h:923
ReturnValueSlot - Contains the address where the return value of a function can be stored...
Definition: CGCall.h:363
const internal::VariadicAllOfMatcher< Type > type
Matches Types in the clang AST.
Address CreateStructGEP(Address Addr, unsigned Index, const llvm::Twine &Name="")
Definition: CGBuilder.h:178
Defines the clang::ASTContext interface.
Expr * getChosenSubExpr() const
getChosenSubExpr - Return the subexpression chosen according to the condition.
Definition: Expr.h:4044
Address getAddress() const
Definition: CGValue.h:582
Destroyer * getDestroyer(QualType::DestructionKind destructionKind)
Definition: CGDecl.cpp:1924
A (possibly-)qualified type.
Definition: Type.h:634
bool isPODType(const ASTContext &Context) const
Determine whether this is a Plain Old Data (POD) type (C++ 3.9p10).
Definition: Type.cpp:2122
bool isArrayType() const
Definition: Type.h:6350
llvm::Type * ConvertTypeForMem(QualType T)
void EmitBranchOnBoolExpr(const Expr *Cond, llvm::BasicBlock *TrueBlock, llvm::BasicBlock *FalseBlock, uint64_t TrueCount)
EmitBranchOnBoolExpr - Emit a branch on a boolean condition (e.g.
RValue EmitCoyieldExpr(const CoyieldExpr &E, AggValueSlot aggSlot=AggValueSlot::ignored(), bool ignoreResult=false)
Address CreateMemTemp(QualType T, const Twine &Name="tmp", Address *Alloca=nullptr)
CreateMemTemp - Create a temporary memory object of the given type, with appropriate alignmen and cas...
Definition: CGExpr.cpp:138
void enterFullExpression(const FullExpr *E)
bool HaveInsertPoint() const
HaveInsertPoint - True if an insertion point is defined.
Expr * getResultExpr()
Return the result expression of this controlling expression.
Definition: Expr.h:5228
CompoundStmt * getSubStmt()
Definition: Expr.h:3843
const Expr * getInit(unsigned Init) const
Definition: Expr.h:4259
Stmt - This represents one statement.
Definition: Stmt.h:65
Address GetAddressOfDirectBaseInCompleteClass(Address Value, const CXXRecordDecl *Derived, const CXXRecordDecl *Base, bool BaseIsVirtual)
GetAddressOfBaseOfCompleteClass - Convert the given pointer to a complete class to the given direct b...
Definition: CGClass.cpp:199
llvm::Constant * tryEmitForInitializer(const VarDecl &D)
Try to emit the initiaizer of the given declaration as an abstract constant.
CharUnits getBaseClassOffset(const CXXRecordDecl *Base) const
getBaseClassOffset - Get the offset, in chars, for the given base class.
Definition: RecordLayout.h:232
NeedsGCBarriers_t requiresGCollection() const
Definition: CGValue.h:574
tooling::Replacements cleanup(const FormatStyle &Style, StringRef Code, ArrayRef< tooling::Range > Ranges, StringRef FileName="<stdin>")
Clean up any erroneous/redundant code in the given Ranges in Code.
Definition: Format.cpp:2227
llvm::Value * getPointer() const
Definition: CGValue.h:578
bool isRecordType() const
Definition: Type.h:6374
Address EmitVAArg(VAArgExpr *VE, Address &VAListAddr)
Generate code to get an argument from the passed in pointer and update it accordingly.
Definition: CGCall.cpp:4591
virtual void EmitGCMemmoveCollectable(CodeGen::CodeGenFunction &CGF, Address DestPtr, Address SrcPtr, llvm::Value *Size)=0
RValue EmitPseudoObjectRValue(const PseudoObjectExpr *e, AggValueSlot slot=AggValueSlot::ignored())
Definition: CGExpr.cpp:4918
RValue EmitCoawaitExpr(const CoawaitExpr &E, AggValueSlot aggSlot=AggValueSlot::ignored(), bool ignoreResult=false)
bool isTransparent() const
Is this a transparent initializer list (that is, an InitListExpr that is purely syntactic, and whose semantics are that of the sole contained initializer)?
Definition: Expr.cpp:2058
Defines the C++ template declaration subclasses.
Opcode getOpcode() const
Definition: Expr.h:3348
ParenExpr - This represents a parethesized expression, e.g.
Definition: Expr.h:1877
void EmitStoreThroughLValue(RValue Src, LValue Dst, bool isInit=false)
EmitStoreThroughLValue - Store the specified rvalue into the specified lvalue, where both are guarant...
Definition: CGExpr.cpp:1918
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 an array type, per C99 6.7.5.2 - Array Declarators.
Definition: Type.h:2817
Represents a call to a C++ constructor.
Definition: ExprCXX.h:1261
bool hasTrivialMoveConstructor() const
Determine whether this class has a trivial move constructor (C++11 [class.copy]p12) ...
Definition: DeclCXX.h:1422
stable_iterator stable_begin() const
Create a stable reference to the top of the EH stack.
Definition: EHScopeStack.h:378
void setZeroed(bool V=true)
Definition: CGValue.h:614
QualType getValueType() const
Gets the type contained by this atomic type, i.e.
Definition: Type.h:5988
LValue EmitLValueForFieldInitialization(LValue Base, const FieldDecl *Field)
EmitLValueForFieldInitialization - Like EmitLValueForField, except that if the Field is a reference...
Definition: CGExpr.cpp:3975
llvm::IntegerType * Int8Ty
i8, i16, i32, and i64
Represents a prvalue temporary that is written into memory so that a reference can bind to it...
Definition: ExprCXX.h:4155
IsAliased_t isPotentiallyAliased() const
Definition: CGValue.h:594
void EmitAtomicStore(RValue rvalue, LValue lvalue, bool isInit)
Definition: CGAtomic.cpp:1894
QualType getElementType() const
Definition: Type.h:2852
static bool isBlockVarRef(const Expr *E)
Is the value of the given expression possibly a reference to or into a __block variable?
Definition: CGExprAgg.cpp:1046
static Expr * findPeephole(Expr *op, CastKind kind)
Attempt to look through various unimportant expressions to find a cast of the given kind...
Definition: CGExprAgg.cpp:663
Represents a variable declaration or definition.
Definition: Decl.h:812
CompoundLiteralExpr - [C99 6.5.2.5].
Definition: Expr.h:2963
OpaqueValueExpr * getCommonExpr() const
Get the common subexpression shared by all initializations (the source array).
Definition: Expr.h:4846
const T * getAs() const
Member-template getAs<specific type>&#39;.
Definition: Type.h:6761
uint64_t getProfileCount(const Stmt *S)
Get the profiler&#39;s count for the given statement.
static bool isSimpleZero(const Expr *E, CodeGenFunction &CGF)
isSimpleZero - If emitting this value will obviously just cause a store of zero to memory...
Definition: CGExprAgg.cpp:1333
LangAS
Defines the address space values used by the address space qualifier of QualType. ...
Definition: AddressSpaces.h:25
IsZeroed_t isZeroed() const
Definition: CGValue.h:615
Implicit construction of a std::initializer_list<T> object from an array temporary within list-initia...
Definition: ExprCXX.h:623
llvm::Value * getPointer() const
Definition: Address.h:37
CXXConstructorDecl * getConstructor() const
Get the constructor that this expression will call.
Definition: ExprCXX.h:1482
A C++ throw-expression (C++ [except.throw]).
Definition: ExprCXX.h:1014
Represents an expression – generally a full-expression – that introduces cleanups to be run at the ...
Definition: ExprCXX.h:3088
void EmitStoreThroughBitfieldLValue(RValue Src, LValue Dst, llvm::Value **Result=nullptr)
EmitStoreThroughBitfieldLValue - Store Src into Dst with same constraints as EmitStoreThroughLValue.
Definition: CGExpr.cpp:2015
The collection of all-type qualifiers we support.
Definition: Type.h:137
CXXRecordDecl * getLambdaClass() const
Retrieve the class that corresponds to the lambda.
Definition: ExprCXX.cpp:1195
bool hasFloatingRepresentation() const
Determine whether this type has a floating-point representation of some sort, e.g., it is a floating-point type or a vector thereof.
Definition: Type.cpp:1951
static CharUnits GetNumNonZeroBytesInInit(const Expr *E, CodeGenFunction &CGF)
GetNumNonZeroBytesInInit - Get an approximate count of the number of non-zero bytes that will be stor...
Definition: CGExprAgg.cpp:1714
Represents a struct/union/class.
Definition: Decl.h:3592
bool isEmpty() const
Determine whether this is an empty class in the sense of (C++11 [meta.unary.prop]).
Definition: DeclCXX.h:1326
uint64_t getPointerWidth(unsigned AddrSpace) const
Return the width of pointers on this target, for the specified address space.
Definition: TargetInfo.h:358
const TargetInfo & getTarget() const
An object to manage conditionally-evaluated expressions.
AggValueSlot::Overlap_t overlapForBaseInit(const CXXRecordDecl *RD, const CXXRecordDecl *BaseRD, bool IsVirtual)
Determine whether a base class initialization may overlap some other object.
Definition: CGExprAgg.cpp:1842
IsDestructed_t isExternallyDestructed() const
Definition: CGValue.h:550
Expr * GetTemporaryExpr() const
Retrieve the temporary-generating subexpression whose value will be materialized into a glvalue...
Definition: ExprCXX.h:4196
Address getAddress() const
Definition: CGValue.h:326
CodeGenFunction - This class organizes the per-function state that is used while generating LLVM code...
Holds long-lived AST nodes (such as types and decls) that can be referred to throughout the semantic ...
Definition: ASTContext.h:154
llvm::Value * EmitDynamicCast(Address V, const CXXDynamicCastExpr *DCE)
Definition: CGExprCXX.cpp:2149
RValue EmitReferenceBindingToExpr(const Expr *E)
Emits a reference binding to the passed in expression.
Definition: CGExpr.cpp:592
field_range fields() const
Definition: Decl.h:3783
Represents a member of a struct/union/class.
Definition: Decl.h:2578
Represents a place-holder for an object not to be initialized by anything.
Definition: Expr.h:4739
An RAII object to set (and then clear) a mapping for an OpaqueValueExpr.
bool isReferenceType() const
Definition: Type.h:6313
bool hasTrivialMoveAssignment() const
Determine whether this class has a trivial move assignment operator (C++11 [class.copy]p25)
Definition: DeclCXX.h:1462
Denotes a cleanup that should run when a scope is exited using exceptional control flow (a throw stat...
Definition: EHScopeStack.h:80
Expr * getSourceExpr() const
The source expression of an opaque value expression is the expression which originally generated the ...
Definition: Expr.h:1036
static AggValueSlot forAddr(Address addr, Qualifiers quals, IsDestructed_t isDestructed, NeedsGCBarriers_t needsGC, IsAliased_t isAliased, Overlap_t mayOverlap, IsZeroed_t isZeroed=IsNotZeroed, IsSanitizerChecked_t isChecked=IsNotSanitizerChecked)
forAddr - Make a slot for an aggregate value.
Definition: CGValue.h:513
static CharUnits Zero()
Zero - Construct a CharUnits quantity of zero.
Definition: CharUnits.h:52
CharUnits getPreferredSize(ASTContext &Ctx, QualType Type) const
Get the preferred size to use when storing a value to this slot.
Definition: CGValue.h:622
Expr * getSubExpr()
Definition: Expr.h:3088
bool isPaddedAtomicType(QualType type)
static bool isTrivialFiller(Expr *E)
Determine if E is a trivial array filler, that is, one that is equivalent to zero-initialization.
Definition: CGExprAgg.cpp:443
bool isIntegralOrEnumerationType() const
Determine whether this type is an integral or enumeration type.
Definition: Type.h:6657
specific_decl_iterator< FieldDecl > field_iterator
Definition: Decl.h:3780
bool hadArrayRangeDesignator() const
Definition: Expr.h:4379
void EmitStoreOfScalar(llvm::Value *Value, Address Addr, bool Volatile, QualType Ty, AlignmentSource Source=AlignmentSource::Type, bool isInit=false, bool isNontemporal=false)
EmitStoreOfScalar - Store a scalar value to an address, taking care to appropriately convert from the...
void setNonGC(bool Value)
Definition: CGValue.h:276
RValue EmitAnyExpr(const Expr *E, AggValueSlot aggSlot=AggValueSlot::ignored(), bool ignoreResult=false)
EmitAnyExpr - Emit code to compute the specified expression which can have any type.
Definition: CGExpr.cpp:193
void pushFullExprCleanup(CleanupKind kind, As... A)
pushFullExprCleanup - Push a cleanup to be run at the end of the current full-expression.
bool isGLValue() const
Definition: Expr.h:254
void EmitInheritedCXXConstructorCall(const CXXConstructorDecl *D, bool ForVirtualBase, Address This, bool InheritedFromVBase, const CXXInheritedCtorInitExpr *E)
Emit a call to a constructor inherited from a base class, passing the current constructor&#39;s arguments...
Definition: CGClass.cpp:2157
Describes an C or C++ initializer list.
Definition: Expr.h:4211
A C++ typeid expression (C++ [expr.typeid]), which gets the type_info that corresponds to the supplie...
Definition: ExprCXX.h:668
void pushRegularPartialArrayCleanup(llvm::Value *arrayBegin, llvm::Value *arrayEnd, QualType elementType, CharUnits elementAlignment, Destroyer *destroyer)
pushRegularPartialArrayCleanup - Push an EH cleanup to destroy already-constructed elements of the gi...
Definition: CGDecl.cpp:2193
static bool hasScalarEvaluationKind(QualType T)
Address CreateElementBitCast(Address Addr, llvm::Type *Ty, const llvm::Twine &Name="")
Cast the element type of the given address to a different type, preserving information like the align...
Definition: CGBuilder.h:156
CharUnits - This is an opaque type for sizes expressed in character units.
Definition: CharUnits.h:37
bool isPartial() const
True iff the comparison is not totally ordered.
bool isTriviallyCopyableType(const ASTContext &Context) const
Return true if this is a trivially copyable type (C++0x [basic.types]p9)
Definition: Type.cpp:2226
capture_init_iterator capture_init_begin()
Retrieve the first initialization argument for this lambda expression (which initializes the first ca...
Definition: ExprCXX.h:1793
CharUnits getAlignment() const
Return the alignment of this pointer.
Definition: Address.h:66
bool isComplex() const
Definition: CGValue.h:52
A builtin binary operation expression such as "x + y" or "x <= y".
Definition: Expr.h:3313
bool isVolatileQualified() const
Determine whether this type is volatile-qualified.
Definition: Type.h:6147
bool needsEHCleanup(QualType::DestructionKind kind)
Determines whether an EH cleanup is required to destroy a type with the given destruction kind...
bool constructsVBase() const
Determine whether this constructor is actually constructing a base class (rather than a complete obje...
Definition: ExprCXX.h:1486
llvm::CallInst * CreateMemCpy(Address Dest, Address Src, llvm::Value *Size, bool IsVolatile=false)
Definition: CGBuilder.h:274
void EmitLambdaVLACapture(const VariableArrayType *VAT, LValue LV)
Scope - A scope is a transient data structure that is used while parsing the program.
Definition: Scope.h:40
field_iterator field_begin() const
Definition: Decl.cpp:4150
llvm::BasicBlock * createBasicBlock(const Twine &name="", llvm::Function *parent=nullptr, llvm::BasicBlock *before=nullptr)
createBasicBlock - Create an LLVM basic block.
void EmitIgnoredExpr(const Expr *E)
EmitIgnoredExpr - Emit an expression in a context which ignores the result.
Definition: CGExpr.cpp:181
CastExpr - Base class for type casts, including both implicit casts (ImplicitCastExpr) and explicit c...
Definition: Expr.h:3036
Represents binding an expression to a temporary.
Definition: ExprCXX.h:1216
bool isSimple() const
Definition: CGValue.h:251
RValue EmitAtomicExpr(AtomicExpr *E)
Definition: CGAtomic.cpp:744
CXXTemporary * getTemporary()
Definition: ExprCXX.h:1235
A C++ lambda expression, which produces a function object (of unspecified type) that can be invoked l...
Definition: ExprCXX.h:1648
bool isEquality() const
True iff the comparison category is an equality comparison.
void incrementProfileCounter(const Stmt *S, llvm::Value *StepV=nullptr)
Increment the profiler&#39;s counter for the given statement by StepV.
llvm::AllocaInst * CreateTempAlloca(llvm::Type *Ty, const Twine &Name="tmp", llvm::Value *ArraySize=nullptr)
CreateTempAlloca - This creates an alloca and inserts it into the entry block if ArraySize is nullptr...
Definition: CGExpr.cpp:105
const ComparisonCategoryInfo & getInfoForType(QualType Ty) const
Return the comparison category information as specified by getCategoryForType(Ty).
void callCStructMoveConstructor(LValue Dst, LValue Src)
Address getAggregateAddress() const
getAggregateAddr() - Return the Value* of the address of the aggregate.
Definition: CGValue.h:70
A default argument (C++ [dcl.fct.default]).
Definition: ExprCXX.h:1072
Checking the operand of a load. Must be suitably sized and aligned.
bool isTypeConstant(QualType QTy, bool ExcludeCtorDtor)
isTypeConstant - Determine whether an object of this type can be emitted as a constant.
const Expr * getExpr() const
Get the initialization expression that will be used.
Definition: ExprCXX.h:1161
RValue EmitObjCMessageExpr(const ObjCMessageExpr *E, ReturnValueSlot Return=ReturnValueSlot())
Definition: CGObjC.cpp:459
bool hasAttr() const
Definition: DeclBase.h:533
bool isTriviallyCopyable() const
Determine whether this class is considered trivially copyable per (C++11 [class]p6).
Definition: DeclCXX.cpp:532
bool isValid() const
Definition: Address.h:35
void EmitCXXConstructExpr(const CXXConstructExpr *E, AggValueSlot Dest)
Definition: CGExprCXX.cpp:555
static CharUnits One()
One - Construct a CharUnits quantity of one.
Definition: CharUnits.h:57
CastKind
CastKind - The kind of operation required for a conversion.
RValue - This trivial value class is used to represent the result of an expression that is evaluated...
Definition: CGValue.h:38
InitListExpr * getUpdater() const
Definition: Expr.h:4797
QuantityType getQuantity() const
getQuantity - Get the raw integer representation of this quantity.
Definition: CharUnits.h:178
ConstantExpr - An expression that occurs in a constant context.
Definition: Expr.h:937
Represents a call to the builtin function __builtin_va_arg.
Definition: Expr.h:4117
bool isPointerZeroInitializable(QualType T)
Check if the pointer type can be zero-initialized (in the C++ sense) with an LLVM zeroinitializer...
ASTRecordLayout - This class contains layout information for one RecordDecl, which is a struct/union/...
Definition: RecordLayout.h:38
bool HasSideEffects(const ASTContext &Ctx, bool IncludePossibleEffects=true) const
HasSideEffects - This routine returns true for all those expressions which have any effect other than...
Definition: Expr.cpp:3125
static TypeEvaluationKind getEvaluationKind(QualType T)
getEvaluationKind - Return the TypeEvaluationKind of QualType T.
CGObjCRuntime & getObjCRuntime()
Return a reference to the configured Objective-C runtime.
PrimitiveCopyKind isNonTrivialToPrimitiveDestructiveMove() const
Check if this is a non-trivial type that would cause a C struct transitively containing this type to ...
Definition: Type.cpp:2360
An expression "T()" which creates a value-initialized rvalue of type T, which is a non-class type...
Definition: ExprCXX.h:1870
void callCStructMoveAssignmentOperator(LValue Dst, LValue Src)
This represents one expression.
Definition: Expr.h:108
ExprValueKind
The categorization of expression values, currently following the C++11 scheme.
Definition: Specifiers.h:106
static Address invalid()
Definition: Address.h:34
Qualifiers getQualifiers() const
Definition: CGValue.h:557
Enters a new scope for capturing cleanups, all of which will be executed once the scope is exited...
std::pair< llvm::Value *, llvm::Value * > getComplexVal() const
getComplexVal - Return the real/imag components of this complex value.
Definition: CGValue.h:65
const T * castAs() const
Member-template castAs<specific type>.
Definition: Type.h:6824
Address EmitCompoundStmt(const CompoundStmt &S, bool GetLast=false, AggValueSlot AVS=AggValueSlot::ignored())
EmitCompoundStmt - Emit a compound statement {..} node.
Definition: CGStmt.cpp:368
unsigned getNumInits() const
Definition: Expr.h:4241
Expr * getSubExpr() const
Get the initializer to use for each array element.
Definition: Expr.h:4851
AggValueSlot CreateAggTemp(QualType T, const Twine &Name="tmp")
CreateAggTemp - Create a temporary memory object for the given aggregate type.
field_iterator field_end() const
Definition: Decl.h:3786
llvm::PointerType * getType() const
Return the type of the pointer value.
Definition: Address.h:43
CharUnits getTypeAlignInChars(QualType T) const
Return the ABI-specified alignment of a (complete) type T, in characters.
bool isAnyComplexType() const
Definition: Type.h:6382
const ValueInfo * getNonequalOrNonequiv() const
static CharUnits fromQuantity(QuantityType Quantity)
fromQuantity - Construct a CharUnits quantity from a raw integer type.
Definition: CharUnits.h:62
QualType getType() const
Definition: Expr.h:130
An RAII object to record that we&#39;re evaluating a statement expression.
TBAAAccessInfo getTBAAInfo() const
Definition: CGValue.h:307
CharUnits alignmentOfArrayElement(CharUnits elementSize) const
Given that this is the alignment of the first element of an array, return the minimum alignment of an...
Definition: CharUnits.h:196
An expression that sends a message to the given Objective-C object or class.
Definition: ExprObjC.h:897
llvm::CallInst * CreateMemSet(Address Dest, llvm::Value *Value, llvm::Value *Size, bool IsVolatile=false)
Definition: CGBuilder.h:296
UnaryOperator - This represents the unary-expression&#39;s (except sizeof and alignof), the postinc/postdec operators from postfix-expression, and various extensions.
Definition: Expr.h:1929
const AstTypeMatcher< AtomicType > atomicType
Matches atomic types.
Represents a reference to a non-type template parameter that has been substituted with a template arg...
Definition: ExprCXX.h:3957
bool hasTrivialCopyConstructor() const
Determine whether this class has a trivial copy constructor (C++ [class.copy]p6, C++11 [class...
Definition: DeclCXX.h:1399
const Expr * getSubExpr() const
Definition: Expr.h:1893
const Expr * getSubExpr() const
Definition: ExprCXX.h:1239
ASTContext & getContext() const
RValue EmitAtomicLoad(LValue LV, SourceLocation SL, AggValueSlot Slot=AggValueSlot::ignored())
Definition: CGAtomic.cpp:1470
void callCStructCopyAssignmentOperator(LValue Dst, LValue Src)
RecordDecl * getDecl() const
Definition: Type.h:4385
const ValueInfo * getGreater() const
OpaqueValueExpr - An expression referring to an opaque object of a fixed type and value class...
Definition: Expr.h:978
Address CreateBitCast(Address Addr, llvm::Type *Ty, const llvm::Twine &Name="")
Definition: CGBuilder.h:141
Expr * getBase() const
Definition: Expr.h:4794
Kind
Represents a call to an inherited base class constructor from an inheriting constructor.
Definition: ExprCXX.h:1447
PseudoObjectExpr - An expression which accesses a pseudo-object l-value.
Definition: Expr.h:5503
bool inheritedFromVBase() const
Determine whether the inherited constructor is inherited from a virtual base of the object we constru...
Definition: ExprCXX.h:1496
void pushDestroy(QualType::DestructionKind dtorKind, Address addr, QualType type)
pushDestroy - Push the standard destructor for the given type as at least a normal cleanup...
Definition: CGDecl.cpp:1951
bool hasTrivialCopyAssignment() const
Determine whether this class has a trivial copy assignment operator (C++ [class.copy]p11, C++11 [class.copy]p25)
Definition: DeclCXX.h:1449
bool LValueIsSuitableForInlineAtomic(LValue Src)
An LValue is a candidate for having its loads and stores be made atomic if we are operating under /vo...
Definition: CGAtomic.cpp:1457
LangAS getAddressSpace() const
Return the address space of this type.
Definition: Type.h:6193
A saved depth on the scope stack.
Definition: EHScopeStack.h:106
Expr * getSubExpr() const
Definition: Expr.h:1959
LValue EmitCheckedLValue(const Expr *E, TypeCheckKind TCK)
Same as EmitLValue but additionally we generate checking code to guard against undefined behavior...
Definition: CGExpr.cpp:1207
CastKind getCastKind() const
Definition: Expr.h:3082
const ValueInfo * getLess() const
LValue EmitAggExprToLValue(const Expr *E)
EmitAggExprToLValue - Emit the computation of the specified expression of aggregate type into a tempo...
Definition: CGExprAgg.cpp:1831
void DeactivateCleanupBlock(EHScopeStack::stable_iterator Cleanup, llvm::Instruction *DominatingIP)
DeactivateCleanupBlock - Deactivates the given cleanup block.
Definition: CGCleanup.cpp:1239
The type is a struct containing a field whose type is neither PCK_Trivial nor PCK_VolatileTrivial.
Definition: Type.h:1120
An aggregate value slot.
Definition: CGValue.h:436
llvm::Value * EmitLifetimeStart(uint64_t Size, llvm::Value *Addr)
Emit a lifetime.begin marker if some criteria are satisfied.
Definition: CGDecl.cpp:1209
A scoped helper to set the current debug location to the specified location or preferred location of ...
Definition: CGDebugInfo.h:686
QualType getBaseElementType(const ArrayType *VAT) const
Return the innermost element type of an array type.
const ConstantArrayType * getAsConstantArrayType(QualType T) const
Definition: ASTContext.h:2426
StmtVisitor - This class implements a simple visitor for Stmt subclasses.
Definition: StmtVisitor.h:182
const ArrayType * getAsArrayType(QualType T) const
Type Query functions.
AtomicExpr - Variadic atomic builtins: __atomic_exchange, __atomic_fetch_*, __atomic_load, __atomic_store, and __atomic_compare_exchange_*, for the similarly-named C++11 instructions, and __c11 variants for <stdatomic.h>, and corresponding __opencl_atomic_* for OpenCL 2.0.
Definition: Expr.h:5637
void EmitCXXTemporary(const CXXTemporary *Temporary, QualType TempType, Address Ptr)
Emits all the code to cause the given temporary to be cleaned up.
Definition: CGCleanup.cpp:1271
static void CheckAggExprForMemSetUse(AggValueSlot &Slot, const Expr *E, CodeGenFunction &CGF)
CheckAggExprForMemSetUse - If the initializer is large and has a lot of zeros in it, emit a memset and avoid storing the individual zeros.
Definition: CGExprAgg.cpp:1774
An aligned address.
Definition: Address.h:24
DestructionKind isDestructedType() const
Returns a nonzero value if objects of this type require non-trivial work to clean up after...
Definition: Type.h:1154
LValue EmitPointerToDataMemberBinaryExpr(const BinaryOperator *E)
Definition: CGExpr.cpp:4789
PrimitiveCopyKind isNonTrivialToPrimitiveCopy() const
Check if this is a non-trivial type that would cause a C struct transitively containing this type to ...
Definition: Type.cpp:2342
StmtExpr - This is the GNU Statement Expression extension: ({int X=4; X;}).
Definition: Expr.h:3827
QualType getType() const
Definition: CGValue.h:263
RValue EmitCallExpr(const CallExpr *E, ReturnValueSlot ReturnValue=ReturnValueSlot())
Definition: CGExpr.cpp:4341
Expr * getArrayFiller()
If this initializer list initializes an array with more elements than there are initializers in the l...
Definition: Expr.h:4305
bool hasSameUnqualifiedType(QualType T1, QualType T2) const
Determine whether the given types are equivalent after cvr-qualifiers have been removed.
Definition: ASTContext.h:2306
SourceLocation getExprLoc() const LLVM_READONLY
getExprLoc - Return the preferred location for the arrow when diagnosing a problem with a generic exp...
Definition: Expr.cpp:214
const Expr * getInitializer() const
Definition: Expr.h:2989
Expr * getLHS() const
Definition: Expr.h:3353
void setExternallyDestructed(bool destructed=true)
Definition: CGValue.h:553
Represents a C11 generic selection.
Definition: Expr.h:5036
llvm::Value * EmitScalarExpr(const Expr *E, bool IgnoreResultAssign=false)
EmitScalarExpr - Emit the computation of the specified expression of LLVM scalar type, returning the result.
virtual llvm::Value * EmitMemberPointerComparison(CodeGenFunction &CGF, llvm::Value *L, llvm::Value *R, const MemberPointerType *MPT, bool Inequality)
Emit a comparison between two member pointers. Returns an i1.
Definition: CGCXXABI.cpp:86
llvm::Value * getScalarVal() const
getScalarVal() - Return the Value* of this scalar value.
Definition: CGValue.h:58
QualType withVolatile() const
Definition: Type.h:814
void ErrorUnsupported(const Stmt *S, const char *Type)
Print out an error that codegen doesn&#39;t support the specified stmt yet.
This class organizes the cross-function state that is used while generating LLVM code.
void setVolatile(bool flag)
Definition: CGValue.h:563
Dataflow Directional Tag Classes.
[C99 6.4.2.2] - A predefined identifier such as func.
Definition: Expr.h:1791
static AggValueSlot ignored()
ignored - Returns an aggregate value slot indicating that the aggregate value is being ignored...
Definition: CGValue.h:498
CompareKind
Definition: CGExprAgg.cpp:887
A scope within which we are constructing the fields of an object which might use a CXXDefaultInitExpr...
LValue getOrCreateOpaqueLValueMapping(const OpaqueValueExpr *e)
Given an opaque value expression, return its LValue mapping if it exists, otherwise create one...
Definition: CGExpr.cpp:4290
llvm::LoadInst * CreateAlignedLoad(llvm::Value *Addr, CharUnits Align, const llvm::Twine &Name="")
Definition: CGBuilder.h:90
LValue EmitPseudoObjectLValue(const PseudoObjectExpr *e)
Definition: CGExpr.cpp:4923
bool hasUserDeclaredConstructor() const
Determine whether this class has any user-declared constructors.
Definition: DeclCXX.h:982
Represents a &#39;co_yield&#39; expression.
Definition: ExprCXX.h:4501
const Expr * getExpr() const
Definition: ExprCXX.h:1105
U cast(CodeGen::Address addr)
Definition: Address.h:108
llvm::Constant * EmitNullConstant(QualType T)
Return the result of value-initializing the given type, i.e.
Checking the destination of a store. Must be suitably sized and aligned.
CXXRecordDecl * Record
The declaration for the comparison category type from the standard library.
A pointer to member type per C++ 8.3.3 - Pointers to members.
Definition: Type.h:2761
bool isBitField() const
Definition: CGValue.h:253
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
llvm::Module & getModule() const
QualType getCallReturnType(const ASTContext &Ctx) const
getCallReturnType - Get the return type of the call expr.
Definition: Expr.cpp:1395
LValue MakeAddrLValue(Address Addr, QualType T, AlignmentSource Source=AlignmentSource::Type)
specific_decl_iterator - Iterates over a subrange of declarations stored in a DeclContext, providing only those that are of type SpecificDecl (or a class derived from it).
Definition: DeclBase.h:2020
void EmitAggExpr(const Expr *E, AggValueSlot AS)
EmitAggExpr - Emit the computation of the specified expression of aggregate type. ...
Definition: CGExprAgg.cpp:1819
void EmitExplicitCastExprType(const ExplicitCastExpr *E, CodeGenFunction *CGF=nullptr)
Emit type info if type of an expression is a variably modified type.
Definition: CGExpr.cpp:1020
A helper class that allows the use of isa/cast/dyncast to detect TagType objects of structs/unions/cl...
Definition: Type.h:4375
Complex values, per C99 6.2.5p11.
Definition: Type.h:2482
ArraySubscriptExpr - [C99 6.5.2.1] Array Subscripting.
Definition: Expr.h:2345
CodeGenTypes & getTypes() const
AbstractConditionalOperator - An abstract base class for ConditionalOperator and BinaryConditionalOpe...
Definition: Expr.h:3566
llvm::Type * getElementType() const
Return the type of the values stored in this address.
Definition: Address.h:51
const llvm::APInt & getSize() const
Definition: Type.h:2895
bool isAtomicType() const
Definition: Type.h:6411
Represents a &#39;co_await&#39; expression.
Definition: ExprCXX.h:4418
bool isUnique() const
Definition: Expr.h:1044
llvm::Value * getAggregatePointer() const
Definition: CGValue.h:75
void EmitScalarInit(const Expr *init, const ValueDecl *D, LValue lvalue, bool capturedByInit)
Definition: CGDecl.cpp:742
bool hasSameType(QualType T1, QualType T2) const
Determine whether the given types T1 and T2 are equivalent.
Definition: ASTContext.h:2282
Internal linkage, which indicates that the entity can be referred to from within the translation unit...
Definition: Linkage.h:31
void EmitBlock(llvm::BasicBlock *BB, bool IsFinished=false)
EmitBlock - Emit the given block.
Definition: CGStmt.cpp:450
ObjCIvarRefExpr - A reference to an ObjC instance variable.
Definition: ExprObjC.h:506
A use of a default initializer in a constructor or in aggregate initialization.
Definition: ExprCXX.h:1136
CharUnits toCharUnitsFromBits(int64_t BitSize) const
Convert a size in bits to a size in characters.
Overlap_t mayOverlap() const
Definition: CGValue.h:598
void callCStructCopyConstructor(LValue Dst, LValue Src)
static llvm::Value * EmitCompare(CGBuilderTy &Builder, CodeGenFunction &CGF, const BinaryOperator *E, llvm::Value *LHS, llvm::Value *RHS, CompareKind Kind, const char *NameSuffix="")
Definition: CGExprAgg.cpp:893
Defines the C++ Decl subclasses, other than those for templates (found in DeclTemplate.h) and friends (in DeclFriend.h).
MemberExpr - [C99 6.5.2.3] Structure and Union Members.
Definition: Expr.h:2720
void ErrorUnsupported(const Stmt *S, const char *Type)
ErrorUnsupported - Print out an error that codegen doesn&#39;t support the specified stmt yet...
bool hasSignedIntegerRepresentation() const
Determine whether this type has an signed integer representation of some sort, e.g., it is an signed integer type or a vector.
Definition: Type.cpp:1895
Represents a C++ struct/union/class.
Definition: DeclCXX.h:299
Represents a loop initializing the elements of an array.
Definition: Expr.h:4829
ChooseExpr - GNU builtin-in function __builtin_choose_expr.
Definition: Expr.h:4003
llvm::Type * ConvertType(QualType T)
LValue EmitLValue(const Expr *E)
EmitLValue - Emit code to compute a designator that specifies the location of the expression...
Definition: CGExpr.cpp:1243
const ValueInfo * getEqualOrEquiv() const
CharUnits getNonVirtualSize() const
getNonVirtualSize - Get the non-virtual size (in chars) of an object, which is the size of the object...
Definition: RecordLayout.h:202
unsigned kind
All of the diagnostics that can be emitted by the frontend.
Definition: DiagnosticIDs.h:60
StringLiteral - This represents a string literal expression, e.g.
Definition: Expr.h:1599
CallExpr - Represents a function call (C99 6.5.2.2, C++ [expr.call]).
Definition: Expr.h:2429
void finalize(llvm::GlobalVariable *global)
CGCXXABI & getCXXABI() const
bool hasVolatileMember(QualType T)
hasVolatileMember - returns true if aggregate type has a volatile member.
void EmitAggregateCopy(LValue Dest, LValue Src, QualType EltTy, AggValueSlot::Overlap_t MayOverlap, bool isVolatile=false)
EmitAggregateCopy - Emit an aggregate copy.
Definition: CGExprAgg.cpp:1865
capture_init_iterator capture_init_end()
Retrieve the iterator pointing one past the last initialization argument for this lambda expression...
Definition: ExprCXX.h:1805
A reference to a declared variable, function, enum, etc.
Definition: Expr.h:1074
static RValue get(llvm::Value *V)
Definition: CGValue.h:85
bool isUnion() const
Definition: Decl.h:3251
Expr * getRHS() const
Definition: Expr.h:3355
Expr *const * const_capture_init_iterator
Const iterator that walks over the capture initialization arguments.
Definition: ExprCXX.h:1779
bool isPointerType() const
Definition: Type.h:6301
bool hasObjectMember() const
Definition: Decl.h:3673
void EmitLifetimeEnd(llvm::Value *Size, llvm::Value *Addr)
Definition: CGDecl.cpp:1225
CharUnits getTypeSizeInChars(QualType T) const
Return the size of the specified (complete) type T, in characters.
FieldDecl * getInitializedFieldInUnion()
If this initializes a union, specifies which field in the union to initialize.
Definition: Expr.h:4323
static RValue getAggregate(Address addr, bool isVolatile=false)
Definition: CGValue.h:106
LValue - This represents an lvalue references.
Definition: CGValue.h:166
RValue asRValue() const
Definition: CGValue.h:606
const LangOptions & getLangOpts() const
unsigned getTargetAddressSpace(QualType T) const
Definition: ASTContext.h:2517
const ValueInfo * getUnordered() const
llvm::APInt getArraySize() const
Definition: Expr.h:4853
llvm::Value * getPointer() const
Definition: CGValue.h:322
Represents the canonical version of C arrays with a specified constant size.
Definition: Type.h:2877
bool isZeroInitializable(QualType T)
IsZeroInitializable - Return whether a type can be zero-initialized (in the C++ sense) with an LLVM z...
Represents an implicitly-generated value initialization of an object of a given type.
Definition: Expr.h:4919
void EmitCXXThrowExpr(const CXXThrowExpr *E, bool KeepInsertionPoint=true)
bool isScalar() const
Definition: CGValue.h:51
void pushIrregularPartialArrayCleanup(llvm::Value *arrayBegin, Address arrayEndPointer, QualType elementType, CharUnits elementAlignment, Destroyer *destroyer)
pushIrregularPartialArrayCleanup - Push an EH cleanup to destroy already-constructed elements of the ...
Definition: CGDecl.cpp:2176
void EmitNullInitialization(Address DestPtr, QualType Ty)
EmitNullInitialization - Generate code to set a value of the given type to null, If the type contains...
Expr * IgnoreParens() LLVM_READONLY
Skip past any parentheses which might surround this expression until reaching a fixed point...
Definition: Expr.cpp:2593
CanQualType getSizeType() const
Return the unique type for "size_t" (C99 7.17), defined in <stddef.h>.
ComparisonCategories CompCategories
Types and expressions required to build C++2a three-way comparisons using operator<=>, including the values return by builtin <=> operators.
Definition: ASTContext.h:2028