1 //===-- CodeGenFunction.h - Per-Function state for LLVM CodeGen -*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This is the internal per-function state used for llvm translation.
12 //===----------------------------------------------------------------------===//
14 #ifndef LLVM_CLANG_LIB_CODEGEN_CODEGENFUNCTION_H
15 #define LLVM_CLANG_LIB_CODEGEN_CODEGENFUNCTION_H
17 #include "CGBuilder.h"
18 #include "CGDebugInfo.h"
19 #include "CGLoopInfo.h"
21 #include "CodeGenModule.h"
22 #include "CodeGenPGO.h"
23 #include "EHScopeStack.h"
24 #include "VarBypassDetector.h"
25 #include "clang/AST/CharUnits.h"
26 #include "clang/AST/ExprCXX.h"
27 #include "clang/AST/ExprObjC.h"
28 #include "clang/AST/ExprOpenMP.h"
29 #include "clang/AST/Type.h"
30 #include "clang/Basic/ABI.h"
31 #include "clang/Basic/CapturedStmt.h"
32 #include "clang/Basic/OpenMPKinds.h"
33 #include "clang/Basic/TargetInfo.h"
34 #include "clang/Frontend/CodeGenOptions.h"
35 #include "llvm/ADT/ArrayRef.h"
36 #include "llvm/ADT/DenseMap.h"
37 #include "llvm/ADT/SmallVector.h"
38 #include "llvm/IR/ValueHandle.h"
39 #include "llvm/Support/Debug.h"
40 #include "llvm/Transforms/Utils/SanitizerStats.h"
56 class CXXDestructorDecl;
57 class CXXForRangeStmt;
61 class EnumConstantDecl;
63 class FunctionProtoType;
65 class ObjCContainerDecl;
66 class ObjCInterfaceDecl;
69 class ObjCImplementationDecl;
70 class ObjCPropertyImplDecl;
73 class ObjCForCollectionStmt;
75 class ObjCAtThrowStmt;
76 class ObjCAtSynchronizedStmt;
77 class ObjCAutoreleasePoolStmt;
86 class BlockByrefHelpers;
89 class BlockFieldFlags;
90 class RegionCodeGenTy;
91 class TargetCodeGenInfo;
95 /// The kind of evaluation to perform on values of a particular
96 /// type. Basically, is the code in CGExprScalar, CGExprComplex, or
99 /// TODO: should vectors maybe be split out into their own thing?
100 enum TypeEvaluationKind {
106 #define LIST_SANITIZER_CHECKS \
107 SANITIZER_CHECK(AddOverflow, add_overflow, 0) \
108 SANITIZER_CHECK(BuiltinUnreachable, builtin_unreachable, 0) \
109 SANITIZER_CHECK(CFICheckFail, cfi_check_fail, 0) \
110 SANITIZER_CHECK(DivremOverflow, divrem_overflow, 0) \
111 SANITIZER_CHECK(DynamicTypeCacheMiss, dynamic_type_cache_miss, 0) \
112 SANITIZER_CHECK(FloatCastOverflow, float_cast_overflow, 0) \
113 SANITIZER_CHECK(FunctionTypeMismatch, function_type_mismatch, 0) \
114 SANITIZER_CHECK(LoadInvalidValue, load_invalid_value, 0) \
115 SANITIZER_CHECK(MissingReturn, missing_return, 0) \
116 SANITIZER_CHECK(MulOverflow, mul_overflow, 0) \
117 SANITIZER_CHECK(NegateOverflow, negate_overflow, 0) \
118 SANITIZER_CHECK(NullabilityArg, nullability_arg, 0) \
119 SANITIZER_CHECK(NullabilityReturn, nullability_return, 0) \
120 SANITIZER_CHECK(NonnullArg, nonnull_arg, 0) \
121 SANITIZER_CHECK(NonnullReturn, nonnull_return, 0) \
122 SANITIZER_CHECK(OutOfBounds, out_of_bounds, 0) \
123 SANITIZER_CHECK(ShiftOutOfBounds, shift_out_of_bounds, 0) \
124 SANITIZER_CHECK(SubOverflow, sub_overflow, 0) \
125 SANITIZER_CHECK(TypeMismatch, type_mismatch, 1) \
126 SANITIZER_CHECK(VLABoundNotPositive, vla_bound_not_positive, 0)
128 enum SanitizerHandler {
129 #define SANITIZER_CHECK(Enum, Name, Version) Enum,
130 LIST_SANITIZER_CHECKS
131 #undef SANITIZER_CHECK
134 /// CodeGenFunction - This class organizes the per-function state that is used
135 /// while generating LLVM code.
136 class CodeGenFunction : public CodeGenTypeCache {
137 CodeGenFunction(const CodeGenFunction &) = delete;
138 void operator=(const CodeGenFunction &) = delete;
140 friend class CGCXXABI;
142 /// A jump destination is an abstract label, branching to which may
143 /// require a jump out through normal cleanups.
145 JumpDest() : Block(nullptr), ScopeDepth(), Index(0) {}
146 JumpDest(llvm::BasicBlock *Block,
147 EHScopeStack::stable_iterator Depth,
149 : Block(Block), ScopeDepth(Depth), Index(Index) {}
151 bool isValid() const { return Block != nullptr; }
152 llvm::BasicBlock *getBlock() const { return Block; }
153 EHScopeStack::stable_iterator getScopeDepth() const { return ScopeDepth; }
154 unsigned getDestIndex() const { return Index; }
156 // This should be used cautiously.
157 void setScopeDepth(EHScopeStack::stable_iterator depth) {
162 llvm::BasicBlock *Block;
163 EHScopeStack::stable_iterator ScopeDepth;
167 CodeGenModule &CGM; // Per-module state.
168 const TargetInfo &Target;
170 typedef std::pair<llvm::Value *, llvm::Value *> ComplexPairTy;
171 LoopInfoStack LoopStack;
174 // Stores variables for which we can't generate correct lifetime markers
176 VarBypassDetector Bypasses;
178 // CodeGen lambda for loops and support for ordered clause
179 typedef llvm::function_ref<void(CodeGenFunction &, const OMPLoopDirective &,
182 typedef llvm::function_ref<void(CodeGenFunction &, SourceLocation,
183 const unsigned, const bool)>
186 // Codegen lambda for loop bounds in worksharing loop constructs
187 typedef llvm::function_ref<std::pair<LValue, LValue>(
188 CodeGenFunction &, const OMPExecutableDirective &S)>
191 // Codegen lambda for loop bounds in dispatch-based loop implementation
192 typedef llvm::function_ref<std::pair<llvm::Value *, llvm::Value *>(
193 CodeGenFunction &, const OMPExecutableDirective &S, Address LB,
195 CodeGenDispatchBoundsTy;
197 /// \brief CGBuilder insert helper. This function is called after an
198 /// instruction is created using Builder.
199 void InsertHelper(llvm::Instruction *I, const llvm::Twine &Name,
200 llvm::BasicBlock *BB,
201 llvm::BasicBlock::iterator InsertPt) const;
203 /// CurFuncDecl - Holds the Decl for the current outermost
204 /// non-closure context.
205 const Decl *CurFuncDecl;
206 /// CurCodeDecl - This is the inner-most code context, which includes blocks.
207 const Decl *CurCodeDecl;
208 const CGFunctionInfo *CurFnInfo;
210 llvm::Function *CurFn;
212 // Holds coroutine data if the current function is a coroutine. We use a
213 // wrapper to manage its lifetime, so that we don't have to define CGCoroData
216 std::unique_ptr<CGCoroData> Data;
222 /// CurGD - The GlobalDecl for the current function being compiled.
225 /// PrologueCleanupDepth - The cleanup depth enclosing all the
226 /// cleanups associated with the parameters.
227 EHScopeStack::stable_iterator PrologueCleanupDepth;
229 /// ReturnBlock - Unified return block.
230 JumpDest ReturnBlock;
232 /// ReturnValue - The temporary alloca to hold the return
233 /// value. This is invalid iff the function has no return value.
236 /// Return true if a label was seen in the current scope.
237 bool hasLabelBeenSeenInCurrentScope() const {
239 return CurLexicalScope->hasLabels();
240 return !LabelMap.empty();
243 /// AllocaInsertPoint - This is an instruction in the entry block before which
244 /// we prefer to insert allocas.
245 llvm::AssertingVH<llvm::Instruction> AllocaInsertPt;
247 /// \brief API for captured statement code generation.
248 class CGCapturedStmtInfo {
250 explicit CGCapturedStmtInfo(CapturedRegionKind K = CR_Default)
251 : Kind(K), ThisValue(nullptr), CXXThisFieldDecl(nullptr) {}
252 explicit CGCapturedStmtInfo(const CapturedStmt &S,
253 CapturedRegionKind K = CR_Default)
254 : Kind(K), ThisValue(nullptr), CXXThisFieldDecl(nullptr) {
256 RecordDecl::field_iterator Field =
257 S.getCapturedRecordDecl()->field_begin();
258 for (CapturedStmt::const_capture_iterator I = S.capture_begin(),
260 I != E; ++I, ++Field) {
261 if (I->capturesThis())
262 CXXThisFieldDecl = *Field;
263 else if (I->capturesVariable())
264 CaptureFields[I->getCapturedVar()] = *Field;
265 else if (I->capturesVariableByCopy())
266 CaptureFields[I->getCapturedVar()] = *Field;
270 virtual ~CGCapturedStmtInfo();
272 CapturedRegionKind getKind() const { return Kind; }
274 virtual void setContextValue(llvm::Value *V) { ThisValue = V; }
275 // \brief Retrieve the value of the context parameter.
276 virtual llvm::Value *getContextValue() const { return ThisValue; }
278 /// \brief Lookup the captured field decl for a variable.
279 virtual const FieldDecl *lookup(const VarDecl *VD) const {
280 return CaptureFields.lookup(VD);
283 bool isCXXThisExprCaptured() const { return getThisFieldDecl() != nullptr; }
284 virtual FieldDecl *getThisFieldDecl() const { return CXXThisFieldDecl; }
286 static bool classof(const CGCapturedStmtInfo *) {
290 /// \brief Emit the captured statement body.
291 virtual void EmitBody(CodeGenFunction &CGF, const Stmt *S) {
292 CGF.incrementProfileCounter(S);
296 /// \brief Get the name of the capture helper.
297 virtual StringRef getHelperName() const { return "__captured_stmt"; }
300 /// \brief The kind of captured statement being generated.
301 CapturedRegionKind Kind;
303 /// \brief Keep the map between VarDecl and FieldDecl.
304 llvm::SmallDenseMap<const VarDecl *, FieldDecl *> CaptureFields;
306 /// \brief The base address of the captured record, passed in as the first
307 /// argument of the parallel region function.
308 llvm::Value *ThisValue;
310 /// \brief Captured 'this' type.
311 FieldDecl *CXXThisFieldDecl;
313 CGCapturedStmtInfo *CapturedStmtInfo;
315 /// \brief RAII for correct setting/restoring of CapturedStmtInfo.
316 class CGCapturedStmtRAII {
318 CodeGenFunction &CGF;
319 CGCapturedStmtInfo *PrevCapturedStmtInfo;
321 CGCapturedStmtRAII(CodeGenFunction &CGF,
322 CGCapturedStmtInfo *NewCapturedStmtInfo)
323 : CGF(CGF), PrevCapturedStmtInfo(CGF.CapturedStmtInfo) {
324 CGF.CapturedStmtInfo = NewCapturedStmtInfo;
326 ~CGCapturedStmtRAII() { CGF.CapturedStmtInfo = PrevCapturedStmtInfo; }
329 /// An abstract representation of regular/ObjC call/message targets.
330 class AbstractCallee {
331 /// The function declaration of the callee.
332 const Decl *CalleeDecl;
335 AbstractCallee() : CalleeDecl(nullptr) {}
336 AbstractCallee(const FunctionDecl *FD) : CalleeDecl(FD) {}
337 AbstractCallee(const ObjCMethodDecl *OMD) : CalleeDecl(OMD) {}
338 bool hasFunctionDecl() const {
339 return dyn_cast_or_null<FunctionDecl>(CalleeDecl);
341 const Decl *getDecl() const { return CalleeDecl; }
342 unsigned getNumParams() const {
343 if (const auto *FD = dyn_cast<FunctionDecl>(CalleeDecl))
344 return FD->getNumParams();
345 return cast<ObjCMethodDecl>(CalleeDecl)->param_size();
347 const ParmVarDecl *getParamDecl(unsigned I) const {
348 if (const auto *FD = dyn_cast<FunctionDecl>(CalleeDecl))
349 return FD->getParamDecl(I);
350 return *(cast<ObjCMethodDecl>(CalleeDecl)->param_begin() + I);
354 /// \brief Sanitizers enabled for this function.
355 SanitizerSet SanOpts;
357 /// \brief True if CodeGen currently emits code implementing sanitizer checks.
358 bool IsSanitizerScope;
360 /// \brief RAII object to set/unset CodeGenFunction::IsSanitizerScope.
361 class SanitizerScope {
362 CodeGenFunction *CGF;
364 SanitizerScope(CodeGenFunction *CGF);
368 /// In C++, whether we are code generating a thunk. This controls whether we
369 /// should emit cleanups.
372 /// In ARC, whether we should autorelease the return value.
373 bool AutoreleaseResult;
375 /// Whether we processed a Microsoft-style asm block during CodeGen. These can
376 /// potentially set the return value.
379 const FunctionDecl *CurSEHParent = nullptr;
381 /// True if the current function is an outlined SEH helper. This can be a
382 /// finally block or filter expression.
383 bool IsOutlinedSEHHelper;
385 const CodeGen::CGBlockInfo *BlockInfo;
386 llvm::Value *BlockPointer;
388 llvm::DenseMap<const VarDecl *, FieldDecl *> LambdaCaptureFields;
389 FieldDecl *LambdaThisCaptureField;
391 /// \brief A mapping from NRVO variables to the flags used to indicate
392 /// when the NRVO has been applied to this variable.
393 llvm::DenseMap<const VarDecl *, llvm::Value *> NRVOFlags;
395 EHScopeStack EHStack;
396 llvm::SmallVector<char, 256> LifetimeExtendedCleanupStack;
397 llvm::SmallVector<const JumpDest *, 2> SEHTryEpilogueStack;
399 llvm::Instruction *CurrentFuncletPad = nullptr;
401 class CallLifetimeEnd final : public EHScopeStack::Cleanup {
406 CallLifetimeEnd(Address addr, llvm::Value *size)
407 : Addr(addr.getPointer()), Size(size) {}
409 void Emit(CodeGenFunction &CGF, Flags flags) override {
410 CGF.EmitLifetimeEnd(Size, Addr);
414 /// Header for data within LifetimeExtendedCleanupStack.
415 struct LifetimeExtendedCleanupHeader {
416 /// The size of the following cleanup object.
418 /// The kind of cleanup to push: a value from the CleanupKind enumeration.
421 size_t getSize() const { return Size; }
422 CleanupKind getKind() const { return Kind; }
425 /// i32s containing the indexes of the cleanup destinations.
426 llvm::AllocaInst *NormalCleanupDest;
428 unsigned NextCleanupDestIndex;
430 /// FirstBlockInfo - The head of a singly-linked-list of block layouts.
431 CGBlockInfo *FirstBlockInfo;
433 /// EHResumeBlock - Unified block containing a call to llvm.eh.resume.
434 llvm::BasicBlock *EHResumeBlock;
436 /// The exception slot. All landing pads write the current exception pointer
437 /// into this alloca.
438 llvm::Value *ExceptionSlot;
440 /// The selector slot. Under the MandatoryCleanup model, all landing pads
441 /// write the current selector value into this alloca.
442 llvm::AllocaInst *EHSelectorSlot;
444 /// A stack of exception code slots. Entering an __except block pushes a slot
445 /// on the stack and leaving pops one. The __exception_code() intrinsic loads
446 /// a value from the top of the stack.
447 SmallVector<Address, 1> SEHCodeSlotStack;
449 /// Value returned by __exception_info intrinsic.
450 llvm::Value *SEHInfo = nullptr;
452 /// Emits a landing pad for the current EH stack.
453 llvm::BasicBlock *EmitLandingPad();
455 llvm::BasicBlock *getInvokeDestImpl();
458 typename DominatingValue<T>::saved_type saveValueInCond(T value) {
459 return DominatingValue<T>::save(*this, value);
463 /// ObjCEHValueStack - Stack of Objective-C exception values, used for
465 SmallVector<llvm::Value*, 8> ObjCEHValueStack;
467 /// A class controlling the emission of a finally block.
469 /// Where the catchall's edge through the cleanup should go.
470 JumpDest RethrowDest;
472 /// A function to call to enter the catch.
473 llvm::Constant *BeginCatchFn;
475 /// An i1 variable indicating whether or not the @finally is
476 /// running for an exception.
477 llvm::AllocaInst *ForEHVar;
479 /// An i8* variable into which the exception pointer to rethrow
481 llvm::AllocaInst *SavedExnVar;
484 void enter(CodeGenFunction &CGF, const Stmt *Finally,
485 llvm::Constant *beginCatchFn, llvm::Constant *endCatchFn,
486 llvm::Constant *rethrowFn);
487 void exit(CodeGenFunction &CGF);
490 /// Returns true inside SEH __try blocks.
491 bool isSEHTryScope() const { return !SEHTryEpilogueStack.empty(); }
493 /// Returns true while emitting a cleanuppad.
494 bool isCleanupPadScope() const {
495 return CurrentFuncletPad && isa<llvm::CleanupPadInst>(CurrentFuncletPad);
498 /// pushFullExprCleanup - Push a cleanup to be run at the end of the
499 /// current full-expression. Safe against the possibility that
500 /// we're currently inside a conditionally-evaluated expression.
501 template <class T, class... As>
502 void pushFullExprCleanup(CleanupKind kind, As... A) {
503 // If we're not in a conditional branch, or if none of the
504 // arguments requires saving, then use the unconditional cleanup.
505 if (!isInConditionalBranch())
506 return EHStack.pushCleanup<T>(kind, A...);
508 // Stash values in a tuple so we can guarantee the order of saves.
509 typedef std::tuple<typename DominatingValue<As>::saved_type...> SavedTuple;
510 SavedTuple Saved{saveValueInCond(A)...};
512 typedef EHScopeStack::ConditionalCleanup<T, As...> CleanupType;
513 EHStack.pushCleanupTuple<CleanupType>(kind, Saved);
514 initFullExprCleanup();
517 /// \brief Queue a cleanup to be pushed after finishing the current
519 template <class T, class... As>
520 void pushCleanupAfterFullExpr(CleanupKind Kind, As... A) {
521 assert(!isInConditionalBranch() && "can't defer conditional cleanup");
523 LifetimeExtendedCleanupHeader Header = { sizeof(T), Kind };
525 size_t OldSize = LifetimeExtendedCleanupStack.size();
526 LifetimeExtendedCleanupStack.resize(
527 LifetimeExtendedCleanupStack.size() + sizeof(Header) + Header.Size);
529 static_assert(sizeof(Header) % alignof(T) == 0,
530 "Cleanup will be allocated on misaligned address");
531 char *Buffer = &LifetimeExtendedCleanupStack[OldSize];
532 new (Buffer) LifetimeExtendedCleanupHeader(Header);
533 new (Buffer + sizeof(Header)) T(A...);
536 /// Set up the last cleaup that was pushed as a conditional
537 /// full-expression cleanup.
538 void initFullExprCleanup();
540 /// PushDestructorCleanup - Push a cleanup to call the
541 /// complete-object destructor of an object of the given type at the
542 /// given address. Does nothing if T is not a C++ class type with a
543 /// non-trivial destructor.
544 void PushDestructorCleanup(QualType T, Address Addr);
546 /// PushDestructorCleanup - Push a cleanup to call the
547 /// complete-object variant of the given destructor on the object at
548 /// the given address.
549 void PushDestructorCleanup(const CXXDestructorDecl *Dtor, Address Addr);
551 /// PopCleanupBlock - Will pop the cleanup entry on the stack and
552 /// process all branch fixups.
553 void PopCleanupBlock(bool FallThroughIsBranchThrough = false);
555 /// DeactivateCleanupBlock - Deactivates the given cleanup block.
556 /// The block cannot be reactivated. Pops it if it's the top of the
559 /// \param DominatingIP - An instruction which is known to
560 /// dominate the current IP (if set) and which lies along
561 /// all paths of execution between the current IP and the
562 /// the point at which the cleanup comes into scope.
563 void DeactivateCleanupBlock(EHScopeStack::stable_iterator Cleanup,
564 llvm::Instruction *DominatingIP);
566 /// ActivateCleanupBlock - Activates an initially-inactive cleanup.
567 /// Cannot be used to resurrect a deactivated cleanup.
569 /// \param DominatingIP - An instruction which is known to
570 /// dominate the current IP (if set) and which lies along
571 /// all paths of execution between the current IP and the
572 /// the point at which the cleanup comes into scope.
573 void ActivateCleanupBlock(EHScopeStack::stable_iterator Cleanup,
574 llvm::Instruction *DominatingIP);
576 /// \brief Enters a new scope for capturing cleanups, all of which
577 /// will be executed once the scope is exited.
578 class RunCleanupsScope {
579 EHScopeStack::stable_iterator CleanupStackDepth;
580 size_t LifetimeExtendedCleanupStackSize;
581 bool OldDidCallStackSave;
586 RunCleanupsScope(const RunCleanupsScope &) = delete;
587 void operator=(const RunCleanupsScope &) = delete;
590 CodeGenFunction& CGF;
593 /// \brief Enter a new cleanup scope.
594 explicit RunCleanupsScope(CodeGenFunction &CGF)
595 : PerformCleanup(true), CGF(CGF)
597 CleanupStackDepth = CGF.EHStack.stable_begin();
598 LifetimeExtendedCleanupStackSize =
599 CGF.LifetimeExtendedCleanupStack.size();
600 OldDidCallStackSave = CGF.DidCallStackSave;
601 CGF.DidCallStackSave = false;
604 /// \brief Exit this cleanup scope, emitting any accumulated cleanups.
605 ~RunCleanupsScope() {
610 /// \brief Determine whether this scope requires any cleanups.
611 bool requiresCleanups() const {
612 return CGF.EHStack.stable_begin() != CleanupStackDepth;
615 /// \brief Force the emission of cleanups now, instead of waiting
616 /// until this object is destroyed.
617 /// \param ValuesToReload - A list of values that need to be available at
618 /// the insertion point after cleanup emission. If cleanup emission created
619 /// a shared cleanup block, these value pointers will be rewritten.
620 /// Otherwise, they not will be modified.
621 void ForceCleanup(std::initializer_list<llvm::Value**> ValuesToReload = {}) {
622 assert(PerformCleanup && "Already forced cleanup");
623 CGF.DidCallStackSave = OldDidCallStackSave;
624 CGF.PopCleanupBlocks(CleanupStackDepth, LifetimeExtendedCleanupStackSize,
626 PerformCleanup = false;
630 class LexicalScope : public RunCleanupsScope {
632 SmallVector<const LabelDecl*, 4> Labels;
633 LexicalScope *ParentScope;
635 LexicalScope(const LexicalScope &) = delete;
636 void operator=(const LexicalScope &) = delete;
639 /// \brief Enter a new cleanup scope.
640 explicit LexicalScope(CodeGenFunction &CGF, SourceRange Range)
641 : RunCleanupsScope(CGF), Range(Range), ParentScope(CGF.CurLexicalScope) {
642 CGF.CurLexicalScope = this;
643 if (CGDebugInfo *DI = CGF.getDebugInfo())
644 DI->EmitLexicalBlockStart(CGF.Builder, Range.getBegin());
647 void addLabel(const LabelDecl *label) {
648 assert(PerformCleanup && "adding label to dead scope?");
649 Labels.push_back(label);
652 /// \brief Exit this cleanup scope, emitting any accumulated
655 if (CGDebugInfo *DI = CGF.getDebugInfo())
656 DI->EmitLexicalBlockEnd(CGF.Builder, Range.getEnd());
658 // If we should perform a cleanup, force them now. Note that
659 // this ends the cleanup scope before rescoping any labels.
660 if (PerformCleanup) {
661 ApplyDebugLocation DL(CGF, Range.getEnd());
666 /// \brief Force the emission of cleanups now, instead of waiting
667 /// until this object is destroyed.
668 void ForceCleanup() {
669 CGF.CurLexicalScope = ParentScope;
670 RunCleanupsScope::ForceCleanup();
676 bool hasLabels() const {
677 return !Labels.empty();
680 void rescopeLabels();
683 typedef llvm::DenseMap<const Decl *, Address> DeclMapTy;
685 /// \brief The scope used to remap some variables as private in the OpenMP
686 /// loop body (or other captured region emitted without outlining), and to
687 /// restore old vars back on exit.
688 class OMPPrivateScope : public RunCleanupsScope {
689 DeclMapTy SavedLocals;
690 DeclMapTy SavedPrivates;
693 OMPPrivateScope(const OMPPrivateScope &) = delete;
694 void operator=(const OMPPrivateScope &) = delete;
697 /// \brief Enter a new OpenMP private scope.
698 explicit OMPPrivateScope(CodeGenFunction &CGF) : RunCleanupsScope(CGF) {}
700 /// \brief Registers \a LocalVD variable as a private and apply \a
701 /// PrivateGen function for it to generate corresponding private variable.
702 /// \a PrivateGen returns an address of the generated private variable.
703 /// \return true if the variable is registered as private, false if it has
704 /// been privatized already.
706 addPrivate(const VarDecl *LocalVD,
707 llvm::function_ref<Address()> PrivateGen) {
708 assert(PerformCleanup && "adding private to dead scope");
710 // Only save it once.
711 if (SavedLocals.count(LocalVD)) return false;
713 // Copy the existing local entry to SavedLocals.
714 auto it = CGF.LocalDeclMap.find(LocalVD);
715 if (it != CGF.LocalDeclMap.end()) {
716 SavedLocals.insert({LocalVD, it->second});
718 SavedLocals.insert({LocalVD, Address::invalid()});
721 // Generate the private entry.
722 Address Addr = PrivateGen();
723 QualType VarTy = LocalVD->getType();
724 if (VarTy->isReferenceType()) {
725 Address Temp = CGF.CreateMemTemp(VarTy);
726 CGF.Builder.CreateStore(Addr.getPointer(), Temp);
729 SavedPrivates.insert({LocalVD, Addr});
734 /// \brief Privatizes local variables previously registered as private.
735 /// Registration is separate from the actual privatization to allow
736 /// initializers use values of the original variables, not the private one.
737 /// This is important, for example, if the private variable is a class
738 /// variable initialized by a constructor that references other private
739 /// variables. But at initialization original variables must be used, not
741 /// \return true if at least one variable was privatized, false otherwise.
743 copyInto(SavedPrivates, CGF.LocalDeclMap);
744 SavedPrivates.clear();
745 return !SavedLocals.empty();
748 void ForceCleanup() {
749 RunCleanupsScope::ForceCleanup();
750 copyInto(SavedLocals, CGF.LocalDeclMap);
754 /// \brief Exit scope - all the mapped variables are restored.
760 /// Checks if the global variable is captured in current function.
761 bool isGlobalVarCaptured(const VarDecl *VD) const {
762 return !VD->isLocalVarDeclOrParm() && CGF.LocalDeclMap.count(VD) > 0;
766 /// Copy all the entries in the source map over the corresponding
767 /// entries in the destination, which must exist.
768 static void copyInto(const DeclMapTy &src, DeclMapTy &dest) {
769 for (auto &pair : src) {
770 if (!pair.second.isValid()) {
771 dest.erase(pair.first);
775 auto it = dest.find(pair.first);
776 if (it != dest.end()) {
777 it->second = pair.second;
785 /// \brief Takes the old cleanup stack size and emits the cleanup blocks
786 /// that have been added.
788 PopCleanupBlocks(EHScopeStack::stable_iterator OldCleanupStackSize,
789 std::initializer_list<llvm::Value **> ValuesToReload = {});
791 /// \brief Takes the old cleanup stack size and emits the cleanup blocks
792 /// that have been added, then adds all lifetime-extended cleanups from
793 /// the given position to the stack.
795 PopCleanupBlocks(EHScopeStack::stable_iterator OldCleanupStackSize,
796 size_t OldLifetimeExtendedStackSize,
797 std::initializer_list<llvm::Value **> ValuesToReload = {});
799 void ResolveBranchFixups(llvm::BasicBlock *Target);
801 /// The given basic block lies in the current EH scope, but may be a
802 /// target of a potentially scope-crossing jump; get a stable handle
803 /// to which we can perform this jump later.
804 JumpDest getJumpDestInCurrentScope(llvm::BasicBlock *Target) {
805 return JumpDest(Target,
806 EHStack.getInnermostNormalCleanup(),
807 NextCleanupDestIndex++);
810 /// The given basic block lies in the current EH scope, but may be a
811 /// target of a potentially scope-crossing jump; get a stable handle
812 /// to which we can perform this jump later.
813 JumpDest getJumpDestInCurrentScope(StringRef Name = StringRef()) {
814 return getJumpDestInCurrentScope(createBasicBlock(Name));
817 /// EmitBranchThroughCleanup - Emit a branch from the current insert
818 /// block through the normal cleanup handling code (if any) and then
820 void EmitBranchThroughCleanup(JumpDest Dest);
822 /// isObviouslyBranchWithoutCleanups - Return true if a branch to the
823 /// specified destination obviously has no cleanups to run. 'false' is always
824 /// a conservatively correct answer for this method.
825 bool isObviouslyBranchWithoutCleanups(JumpDest Dest) const;
827 /// popCatchScope - Pops the catch scope at the top of the EHScope
828 /// stack, emitting any required code (other than the catch handlers
830 void popCatchScope();
832 llvm::BasicBlock *getEHResumeBlock(bool isCleanup);
833 llvm::BasicBlock *getEHDispatchBlock(EHScopeStack::stable_iterator scope);
834 llvm::BasicBlock *getMSVCDispatchBlock(EHScopeStack::stable_iterator scope);
836 /// An object to manage conditionally-evaluated expressions.
837 class ConditionalEvaluation {
838 llvm::BasicBlock *StartBB;
841 ConditionalEvaluation(CodeGenFunction &CGF)
842 : StartBB(CGF.Builder.GetInsertBlock()) {}
844 void begin(CodeGenFunction &CGF) {
845 assert(CGF.OutermostConditional != this);
846 if (!CGF.OutermostConditional)
847 CGF.OutermostConditional = this;
850 void end(CodeGenFunction &CGF) {
851 assert(CGF.OutermostConditional != nullptr);
852 if (CGF.OutermostConditional == this)
853 CGF.OutermostConditional = nullptr;
856 /// Returns a block which will be executed prior to each
857 /// evaluation of the conditional code.
858 llvm::BasicBlock *getStartingBlock() const {
863 /// isInConditionalBranch - Return true if we're currently emitting
864 /// one branch or the other of a conditional expression.
865 bool isInConditionalBranch() const { return OutermostConditional != nullptr; }
867 void setBeforeOutermostConditional(llvm::Value *value, Address addr) {
868 assert(isInConditionalBranch());
869 llvm::BasicBlock *block = OutermostConditional->getStartingBlock();
870 auto store = new llvm::StoreInst(value, addr.getPointer(), &block->back());
871 store->setAlignment(addr.getAlignment().getQuantity());
874 /// An RAII object to record that we're evaluating a statement
876 class StmtExprEvaluation {
877 CodeGenFunction &CGF;
879 /// We have to save the outermost conditional: cleanups in a
880 /// statement expression aren't conditional just because the
882 ConditionalEvaluation *SavedOutermostConditional;
885 StmtExprEvaluation(CodeGenFunction &CGF)
886 : CGF(CGF), SavedOutermostConditional(CGF.OutermostConditional) {
887 CGF.OutermostConditional = nullptr;
890 ~StmtExprEvaluation() {
891 CGF.OutermostConditional = SavedOutermostConditional;
892 CGF.EnsureInsertPoint();
896 /// An object which temporarily prevents a value from being
897 /// destroyed by aggressive peephole optimizations that assume that
898 /// all uses of a value have been realized in the IR.
899 class PeepholeProtection {
900 llvm::Instruction *Inst;
901 friend class CodeGenFunction;
904 PeepholeProtection() : Inst(nullptr) {}
907 /// A non-RAII class containing all the information about a bound
908 /// opaque value. OpaqueValueMapping, below, is a RAII wrapper for
909 /// this which makes individual mappings very simple; using this
910 /// class directly is useful when you have a variable number of
911 /// opaque values or don't want the RAII functionality for some
913 class OpaqueValueMappingData {
914 const OpaqueValueExpr *OpaqueValue;
916 CodeGenFunction::PeepholeProtection Protection;
918 OpaqueValueMappingData(const OpaqueValueExpr *ov,
920 : OpaqueValue(ov), BoundLValue(boundLValue) {}
922 OpaqueValueMappingData() : OpaqueValue(nullptr) {}
924 static bool shouldBindAsLValue(const Expr *expr) {
925 // gl-values should be bound as l-values for obvious reasons.
926 // Records should be bound as l-values because IR generation
927 // always keeps them in memory. Expressions of function type
928 // act exactly like l-values but are formally required to be
930 return expr->isGLValue() ||
931 expr->getType()->isFunctionType() ||
932 hasAggregateEvaluationKind(expr->getType());
935 static OpaqueValueMappingData bind(CodeGenFunction &CGF,
936 const OpaqueValueExpr *ov,
938 if (shouldBindAsLValue(ov))
939 return bind(CGF, ov, CGF.EmitLValue(e));
940 return bind(CGF, ov, CGF.EmitAnyExpr(e));
943 static OpaqueValueMappingData bind(CodeGenFunction &CGF,
944 const OpaqueValueExpr *ov,
946 assert(shouldBindAsLValue(ov));
947 CGF.OpaqueLValues.insert(std::make_pair(ov, lv));
948 return OpaqueValueMappingData(ov, true);
951 static OpaqueValueMappingData bind(CodeGenFunction &CGF,
952 const OpaqueValueExpr *ov,
954 assert(!shouldBindAsLValue(ov));
955 CGF.OpaqueRValues.insert(std::make_pair(ov, rv));
957 OpaqueValueMappingData data(ov, false);
959 // Work around an extremely aggressive peephole optimization in
960 // EmitScalarConversion which assumes that all other uses of a
962 data.Protection = CGF.protectFromPeepholes(rv);
967 bool isValid() const { return OpaqueValue != nullptr; }
968 void clear() { OpaqueValue = nullptr; }
970 void unbind(CodeGenFunction &CGF) {
971 assert(OpaqueValue && "no data to unbind!");
974 CGF.OpaqueLValues.erase(OpaqueValue);
976 CGF.OpaqueRValues.erase(OpaqueValue);
977 CGF.unprotectFromPeepholes(Protection);
982 /// An RAII object to set (and then clear) a mapping for an OpaqueValueExpr.
983 class OpaqueValueMapping {
984 CodeGenFunction &CGF;
985 OpaqueValueMappingData Data;
988 static bool shouldBindAsLValue(const Expr *expr) {
989 return OpaqueValueMappingData::shouldBindAsLValue(expr);
992 /// Build the opaque value mapping for the given conditional
993 /// operator if it's the GNU ?: extension. This is a common
994 /// enough pattern that the convenience operator is really
997 OpaqueValueMapping(CodeGenFunction &CGF,
998 const AbstractConditionalOperator *op) : CGF(CGF) {
999 if (isa<ConditionalOperator>(op))
1000 // Leave Data empty.
1003 const BinaryConditionalOperator *e = cast<BinaryConditionalOperator>(op);
1004 Data = OpaqueValueMappingData::bind(CGF, e->getOpaqueValue(),
1008 /// Build the opaque value mapping for an OpaqueValueExpr whose source
1009 /// expression is set to the expression the OVE represents.
1010 OpaqueValueMapping(CodeGenFunction &CGF, const OpaqueValueExpr *OV)
1013 assert(OV->getSourceExpr() && "wrong form of OpaqueValueMapping used "
1014 "for OVE with no source expression");
1015 Data = OpaqueValueMappingData::bind(CGF, OV, OV->getSourceExpr());
1019 OpaqueValueMapping(CodeGenFunction &CGF,
1020 const OpaqueValueExpr *opaqueValue,
1022 : CGF(CGF), Data(OpaqueValueMappingData::bind(CGF, opaqueValue, lvalue)) {
1025 OpaqueValueMapping(CodeGenFunction &CGF,
1026 const OpaqueValueExpr *opaqueValue,
1028 : CGF(CGF), Data(OpaqueValueMappingData::bind(CGF, opaqueValue, rvalue)) {
1036 ~OpaqueValueMapping() {
1037 if (Data.isValid()) Data.unbind(CGF);
1042 CGDebugInfo *DebugInfo;
1043 bool DisableDebugInfo;
1045 /// DidCallStackSave - Whether llvm.stacksave has been called. Used to avoid
1046 /// calling llvm.stacksave for multiple VLAs in the same scope.
1047 bool DidCallStackSave;
1049 /// IndirectBranch - The first time an indirect goto is seen we create a block
1050 /// with an indirect branch. Every time we see the address of a label taken,
1051 /// we add the label to the indirect goto. Every subsequent indirect goto is
1052 /// codegen'd as a jump to the IndirectBranch's basic block.
1053 llvm::IndirectBrInst *IndirectBranch;
1055 /// LocalDeclMap - This keeps track of the LLVM allocas or globals for local C
1057 DeclMapTy LocalDeclMap;
1059 /// SizeArguments - If a ParmVarDecl had the pass_object_size attribute, this
1060 /// will contain a mapping from said ParmVarDecl to its implicit "object_size"
1062 llvm::SmallDenseMap<const ParmVarDecl *, const ImplicitParamDecl *, 2>
1065 /// Track escaped local variables with auto storage. Used during SEH
1066 /// outlining to produce a call to llvm.localescape.
1067 llvm::DenseMap<llvm::AllocaInst *, int> EscapedLocals;
1069 /// LabelMap - This keeps track of the LLVM basic block for each C label.
1070 llvm::DenseMap<const LabelDecl*, JumpDest> LabelMap;
1072 // BreakContinueStack - This keeps track of where break and continue
1073 // statements should jump to.
1074 struct BreakContinue {
1075 BreakContinue(JumpDest Break, JumpDest Continue)
1076 : BreakBlock(Break), ContinueBlock(Continue) {}
1078 JumpDest BreakBlock;
1079 JumpDest ContinueBlock;
1081 SmallVector<BreakContinue, 8> BreakContinueStack;
1083 /// Handles cancellation exit points in OpenMP-related constructs.
1084 class OpenMPCancelExitStack {
1085 /// Tracks cancellation exit point and join point for cancel-related exit
1086 /// and normal exit.
1088 CancelExit() = default;
1089 CancelExit(OpenMPDirectiveKind Kind, JumpDest ExitBlock,
1091 : Kind(Kind), ExitBlock(ExitBlock), ContBlock(ContBlock) {}
1092 OpenMPDirectiveKind Kind = OMPD_unknown;
1093 /// true if the exit block has been emitted already by the special
1094 /// emitExit() call, false if the default codegen is used.
1095 bool HasBeenEmitted = false;
1100 SmallVector<CancelExit, 8> Stack;
1103 OpenMPCancelExitStack() : Stack(1) {}
1104 ~OpenMPCancelExitStack() = default;
1105 /// Fetches the exit block for the current OpenMP construct.
1106 JumpDest getExitBlock() const { return Stack.back().ExitBlock; }
1107 /// Emits exit block with special codegen procedure specific for the related
1108 /// OpenMP construct + emits code for normal construct cleanup.
1109 void emitExit(CodeGenFunction &CGF, OpenMPDirectiveKind Kind,
1110 const llvm::function_ref<void(CodeGenFunction &)> &CodeGen) {
1111 if (Stack.back().Kind == Kind && getExitBlock().isValid()) {
1112 assert(CGF.getOMPCancelDestination(Kind).isValid());
1113 assert(CGF.HaveInsertPoint());
1114 assert(!Stack.back().HasBeenEmitted);
1115 auto IP = CGF.Builder.saveAndClearIP();
1116 CGF.EmitBlock(Stack.back().ExitBlock.getBlock());
1118 CGF.EmitBranchThroughCleanup(Stack.back().ContBlock);
1119 CGF.Builder.restoreIP(IP);
1120 Stack.back().HasBeenEmitted = true;
1124 /// Enter the cancel supporting \a Kind construct.
1125 /// \param Kind OpenMP directive that supports cancel constructs.
1126 /// \param HasCancel true, if the construct has inner cancel directive,
1127 /// false otherwise.
1128 void enter(CodeGenFunction &CGF, OpenMPDirectiveKind Kind, bool HasCancel) {
1129 Stack.push_back({Kind,
1130 HasCancel ? CGF.getJumpDestInCurrentScope("cancel.exit")
1132 HasCancel ? CGF.getJumpDestInCurrentScope("cancel.cont")
1135 /// Emits default exit point for the cancel construct (if the special one
1136 /// has not be used) + join point for cancel/normal exits.
1137 void exit(CodeGenFunction &CGF) {
1138 if (getExitBlock().isValid()) {
1139 assert(CGF.getOMPCancelDestination(Stack.back().Kind).isValid());
1140 bool HaveIP = CGF.HaveInsertPoint();
1141 if (!Stack.back().HasBeenEmitted) {
1143 CGF.EmitBranchThroughCleanup(Stack.back().ContBlock);
1144 CGF.EmitBlock(Stack.back().ExitBlock.getBlock());
1145 CGF.EmitBranchThroughCleanup(Stack.back().ContBlock);
1147 CGF.EmitBlock(Stack.back().ContBlock.getBlock());
1149 CGF.Builder.CreateUnreachable();
1150 CGF.Builder.ClearInsertionPoint();
1156 OpenMPCancelExitStack OMPCancelStack;
1158 /// Controls insertion of cancellation exit blocks in worksharing constructs.
1159 class OMPCancelStackRAII {
1160 CodeGenFunction &CGF;
1163 OMPCancelStackRAII(CodeGenFunction &CGF, OpenMPDirectiveKind Kind,
1166 CGF.OMPCancelStack.enter(CGF, Kind, HasCancel);
1168 ~OMPCancelStackRAII() { CGF.OMPCancelStack.exit(CGF); }
1173 /// Calculate branch weights appropriate for PGO data
1174 llvm::MDNode *createProfileWeights(uint64_t TrueCount, uint64_t FalseCount);
1175 llvm::MDNode *createProfileWeights(ArrayRef<uint64_t> Weights);
1176 llvm::MDNode *createProfileWeightsForLoop(const Stmt *Cond,
1177 uint64_t LoopCount);
1180 /// Increment the profiler's counter for the given statement by \p StepV.
1181 /// If \p StepV is null, the default increment is 1.
1182 void incrementProfileCounter(const Stmt *S, llvm::Value *StepV = nullptr) {
1183 if (CGM.getCodeGenOpts().hasProfileClangInstr())
1184 PGO.emitCounterIncrement(Builder, S, StepV);
1185 PGO.setCurrentStmt(S);
1188 /// Get the profiler's count for the given statement.
1189 uint64_t getProfileCount(const Stmt *S) {
1190 Optional<uint64_t> Count = PGO.getStmtCount(S);
1191 if (!Count.hasValue())
1196 /// Set the profiler's current count.
1197 void setCurrentProfileCount(uint64_t Count) {
1198 PGO.setCurrentRegionCount(Count);
1201 /// Get the profiler's current count. This is generally the count for the most
1202 /// recently incremented counter.
1203 uint64_t getCurrentProfileCount() {
1204 return PGO.getCurrentRegionCount();
1209 /// SwitchInsn - This is nearest current switch instruction. It is null if
1210 /// current context is not in a switch.
1211 llvm::SwitchInst *SwitchInsn;
1212 /// The branch weights of SwitchInsn when doing instrumentation based PGO.
1213 SmallVector<uint64_t, 16> *SwitchWeights;
1215 /// CaseRangeBlock - This block holds if condition check for last case
1216 /// statement range in current switch instruction.
1217 llvm::BasicBlock *CaseRangeBlock;
1219 /// OpaqueLValues - Keeps track of the current set of opaque value
1221 llvm::DenseMap<const OpaqueValueExpr *, LValue> OpaqueLValues;
1222 llvm::DenseMap<const OpaqueValueExpr *, RValue> OpaqueRValues;
1224 // VLASizeMap - This keeps track of the associated size for each VLA type.
1225 // We track this by the size expression rather than the type itself because
1226 // in certain situations, like a const qualifier applied to an VLA typedef,
1227 // multiple VLA types can share the same size expression.
1228 // FIXME: Maybe this could be a stack of maps that is pushed/popped as we
1229 // enter/leave scopes.
1230 llvm::DenseMap<const Expr*, llvm::Value*> VLASizeMap;
1232 /// A block containing a single 'unreachable' instruction. Created
1233 /// lazily by getUnreachableBlock().
1234 llvm::BasicBlock *UnreachableBlock;
1236 /// Counts of the number return expressions in the function.
1237 unsigned NumReturnExprs;
1239 /// Count the number of simple (constant) return expressions in the function.
1240 unsigned NumSimpleReturnExprs;
1242 /// The last regular (non-return) debug location (breakpoint) in the function.
1243 SourceLocation LastStopPoint;
1246 /// A scope within which we are constructing the fields of an object which
1247 /// might use a CXXDefaultInitExpr. This stashes away a 'this' value to use
1248 /// if we need to evaluate a CXXDefaultInitExpr within the evaluation.
1249 class FieldConstructionScope {
1251 FieldConstructionScope(CodeGenFunction &CGF, Address This)
1252 : CGF(CGF), OldCXXDefaultInitExprThis(CGF.CXXDefaultInitExprThis) {
1253 CGF.CXXDefaultInitExprThis = This;
1255 ~FieldConstructionScope() {
1256 CGF.CXXDefaultInitExprThis = OldCXXDefaultInitExprThis;
1260 CodeGenFunction &CGF;
1261 Address OldCXXDefaultInitExprThis;
1264 /// The scope of a CXXDefaultInitExpr. Within this scope, the value of 'this'
1265 /// is overridden to be the object under construction.
1266 class CXXDefaultInitExprScope {
1268 CXXDefaultInitExprScope(CodeGenFunction &CGF)
1269 : CGF(CGF), OldCXXThisValue(CGF.CXXThisValue),
1270 OldCXXThisAlignment(CGF.CXXThisAlignment) {
1271 CGF.CXXThisValue = CGF.CXXDefaultInitExprThis.getPointer();
1272 CGF.CXXThisAlignment = CGF.CXXDefaultInitExprThis.getAlignment();
1274 ~CXXDefaultInitExprScope() {
1275 CGF.CXXThisValue = OldCXXThisValue;
1276 CGF.CXXThisAlignment = OldCXXThisAlignment;
1280 CodeGenFunction &CGF;
1281 llvm::Value *OldCXXThisValue;
1282 CharUnits OldCXXThisAlignment;
1285 /// The scope of an ArrayInitLoopExpr. Within this scope, the value of the
1286 /// current loop index is overridden.
1287 class ArrayInitLoopExprScope {
1289 ArrayInitLoopExprScope(CodeGenFunction &CGF, llvm::Value *Index)
1290 : CGF(CGF), OldArrayInitIndex(CGF.ArrayInitIndex) {
1291 CGF.ArrayInitIndex = Index;
1293 ~ArrayInitLoopExprScope() {
1294 CGF.ArrayInitIndex = OldArrayInitIndex;
1298 CodeGenFunction &CGF;
1299 llvm::Value *OldArrayInitIndex;
1302 class InlinedInheritingConstructorScope {
1304 InlinedInheritingConstructorScope(CodeGenFunction &CGF, GlobalDecl GD)
1305 : CGF(CGF), OldCurGD(CGF.CurGD), OldCurFuncDecl(CGF.CurFuncDecl),
1306 OldCurCodeDecl(CGF.CurCodeDecl),
1307 OldCXXABIThisDecl(CGF.CXXABIThisDecl),
1308 OldCXXABIThisValue(CGF.CXXABIThisValue),
1309 OldCXXThisValue(CGF.CXXThisValue),
1310 OldCXXABIThisAlignment(CGF.CXXABIThisAlignment),
1311 OldCXXThisAlignment(CGF.CXXThisAlignment),
1312 OldReturnValue(CGF.ReturnValue), OldFnRetTy(CGF.FnRetTy),
1313 OldCXXInheritedCtorInitExprArgs(
1314 std::move(CGF.CXXInheritedCtorInitExprArgs)) {
1316 CGF.CurFuncDecl = CGF.CurCodeDecl =
1317 cast<CXXConstructorDecl>(GD.getDecl());
1318 CGF.CXXABIThisDecl = nullptr;
1319 CGF.CXXABIThisValue = nullptr;
1320 CGF.CXXThisValue = nullptr;
1321 CGF.CXXABIThisAlignment = CharUnits();
1322 CGF.CXXThisAlignment = CharUnits();
1323 CGF.ReturnValue = Address::invalid();
1324 CGF.FnRetTy = QualType();
1325 CGF.CXXInheritedCtorInitExprArgs.clear();
1327 ~InlinedInheritingConstructorScope() {
1328 CGF.CurGD = OldCurGD;
1329 CGF.CurFuncDecl = OldCurFuncDecl;
1330 CGF.CurCodeDecl = OldCurCodeDecl;
1331 CGF.CXXABIThisDecl = OldCXXABIThisDecl;
1332 CGF.CXXABIThisValue = OldCXXABIThisValue;
1333 CGF.CXXThisValue = OldCXXThisValue;
1334 CGF.CXXABIThisAlignment = OldCXXABIThisAlignment;
1335 CGF.CXXThisAlignment = OldCXXThisAlignment;
1336 CGF.ReturnValue = OldReturnValue;
1337 CGF.FnRetTy = OldFnRetTy;
1338 CGF.CXXInheritedCtorInitExprArgs =
1339 std::move(OldCXXInheritedCtorInitExprArgs);
1343 CodeGenFunction &CGF;
1344 GlobalDecl OldCurGD;
1345 const Decl *OldCurFuncDecl;
1346 const Decl *OldCurCodeDecl;
1347 ImplicitParamDecl *OldCXXABIThisDecl;
1348 llvm::Value *OldCXXABIThisValue;
1349 llvm::Value *OldCXXThisValue;
1350 CharUnits OldCXXABIThisAlignment;
1351 CharUnits OldCXXThisAlignment;
1352 Address OldReturnValue;
1353 QualType OldFnRetTy;
1354 CallArgList OldCXXInheritedCtorInitExprArgs;
1358 /// CXXThisDecl - When generating code for a C++ member function,
1359 /// this will hold the implicit 'this' declaration.
1360 ImplicitParamDecl *CXXABIThisDecl;
1361 llvm::Value *CXXABIThisValue;
1362 llvm::Value *CXXThisValue;
1363 CharUnits CXXABIThisAlignment;
1364 CharUnits CXXThisAlignment;
1366 /// The value of 'this' to use when evaluating CXXDefaultInitExprs within
1367 /// this expression.
1368 Address CXXDefaultInitExprThis = Address::invalid();
1370 /// The current array initialization index when evaluating an
1371 /// ArrayInitIndexExpr within an ArrayInitLoopExpr.
1372 llvm::Value *ArrayInitIndex = nullptr;
1374 /// The values of function arguments to use when evaluating
1375 /// CXXInheritedCtorInitExprs within this context.
1376 CallArgList CXXInheritedCtorInitExprArgs;
1378 /// CXXStructorImplicitParamDecl - When generating code for a constructor or
1379 /// destructor, this will hold the implicit argument (e.g. VTT).
1380 ImplicitParamDecl *CXXStructorImplicitParamDecl;
1381 llvm::Value *CXXStructorImplicitParamValue;
1383 /// OutermostConditional - Points to the outermost active
1384 /// conditional control. This is used so that we know if a
1385 /// temporary should be destroyed conditionally.
1386 ConditionalEvaluation *OutermostConditional;
1388 /// The current lexical scope.
1389 LexicalScope *CurLexicalScope;
1391 /// The current source location that should be used for exception
1393 SourceLocation CurEHLocation;
1395 /// BlockByrefInfos - For each __block variable, contains
1396 /// information about the layout of the variable.
1397 llvm::DenseMap<const ValueDecl *, BlockByrefInfo> BlockByrefInfos;
1399 /// Used by -fsanitize=nullability-return to determine whether the return
1400 /// value can be checked.
1401 llvm::Value *RetValNullabilityPrecondition = nullptr;
1403 /// Check if -fsanitize=nullability-return instrumentation is required for
1405 bool requiresReturnValueNullabilityCheck() const {
1406 return RetValNullabilityPrecondition;
1409 llvm::BasicBlock *TerminateLandingPad;
1410 llvm::BasicBlock *TerminateHandler;
1411 llvm::BasicBlock *TrapBB;
1413 /// True if we need emit the life-time markers.
1414 const bool ShouldEmitLifetimeMarkers;
1416 /// Add OpenCL kernel arg metadata and the kernel attribute meatadata to
1417 /// the function metadata.
1418 void EmitOpenCLKernelMetadata(const FunctionDecl *FD,
1419 llvm::Function *Fn);
1422 CodeGenFunction(CodeGenModule &cgm, bool suppressNewContext=false);
1425 CodeGenTypes &getTypes() const { return CGM.getTypes(); }
1426 ASTContext &getContext() const { return CGM.getContext(); }
1427 CGDebugInfo *getDebugInfo() {
1428 if (DisableDebugInfo)
1432 void disableDebugInfo() { DisableDebugInfo = true; }
1433 void enableDebugInfo() { DisableDebugInfo = false; }
1435 bool shouldUseFusedARCCalls() {
1436 return CGM.getCodeGenOpts().OptimizationLevel == 0;
1439 const LangOptions &getLangOpts() const { return CGM.getLangOpts(); }
1441 /// Returns a pointer to the function's exception object and selector slot,
1442 /// which is assigned in every landing pad.
1443 Address getExceptionSlot();
1444 Address getEHSelectorSlot();
1446 /// Returns the contents of the function's exception object and selector
1448 llvm::Value *getExceptionFromSlot();
1449 llvm::Value *getSelectorFromSlot();
1451 Address getNormalCleanupDestSlot();
1453 llvm::BasicBlock *getUnreachableBlock() {
1454 if (!UnreachableBlock) {
1455 UnreachableBlock = createBasicBlock("unreachable");
1456 new llvm::UnreachableInst(getLLVMContext(), UnreachableBlock);
1458 return UnreachableBlock;
1461 llvm::BasicBlock *getInvokeDest() {
1462 if (!EHStack.requiresLandingPad()) return nullptr;
1463 return getInvokeDestImpl();
1466 bool currentFunctionUsesSEHTry() const { return CurSEHParent != nullptr; }
1468 const TargetInfo &getTarget() const { return Target; }
1469 llvm::LLVMContext &getLLVMContext() { return CGM.getLLVMContext(); }
1471 //===--------------------------------------------------------------------===//
1473 //===--------------------------------------------------------------------===//
1475 typedef void Destroyer(CodeGenFunction &CGF, Address addr, QualType ty);
1477 void pushIrregularPartialArrayCleanup(llvm::Value *arrayBegin,
1478 Address arrayEndPointer,
1479 QualType elementType,
1480 CharUnits elementAlignment,
1481 Destroyer *destroyer);
1482 void pushRegularPartialArrayCleanup(llvm::Value *arrayBegin,
1483 llvm::Value *arrayEnd,
1484 QualType elementType,
1485 CharUnits elementAlignment,
1486 Destroyer *destroyer);
1488 void pushDestroy(QualType::DestructionKind dtorKind,
1489 Address addr, QualType type);
1490 void pushEHDestroy(QualType::DestructionKind dtorKind,
1491 Address addr, QualType type);
1492 void pushDestroy(CleanupKind kind, Address addr, QualType type,
1493 Destroyer *destroyer, bool useEHCleanupForArray);
1494 void pushLifetimeExtendedDestroy(CleanupKind kind, Address addr,
1495 QualType type, Destroyer *destroyer,
1496 bool useEHCleanupForArray);
1497 void pushCallObjectDeleteCleanup(const FunctionDecl *OperatorDelete,
1498 llvm::Value *CompletePtr,
1499 QualType ElementType);
1500 void pushStackRestore(CleanupKind kind, Address SPMem);
1501 void emitDestroy(Address addr, QualType type, Destroyer *destroyer,
1502 bool useEHCleanupForArray);
1503 llvm::Function *generateDestroyHelper(Address addr, QualType type,
1504 Destroyer *destroyer,
1505 bool useEHCleanupForArray,
1507 void emitArrayDestroy(llvm::Value *begin, llvm::Value *end,
1508 QualType elementType, CharUnits elementAlign,
1509 Destroyer *destroyer,
1510 bool checkZeroLength, bool useEHCleanup);
1512 Destroyer *getDestroyer(QualType::DestructionKind destructionKind);
1514 /// Determines whether an EH cleanup is required to destroy a type
1515 /// with the given destruction kind.
1516 bool needsEHCleanup(QualType::DestructionKind kind) {
1518 case QualType::DK_none:
1520 case QualType::DK_cxx_destructor:
1521 case QualType::DK_objc_weak_lifetime:
1522 return getLangOpts().Exceptions;
1523 case QualType::DK_objc_strong_lifetime:
1524 return getLangOpts().Exceptions &&
1525 CGM.getCodeGenOpts().ObjCAutoRefCountExceptions;
1527 llvm_unreachable("bad destruction kind");
1530 CleanupKind getCleanupKind(QualType::DestructionKind kind) {
1531 return (needsEHCleanup(kind) ? NormalAndEHCleanup : NormalCleanup);
1534 //===--------------------------------------------------------------------===//
1536 //===--------------------------------------------------------------------===//
1538 void GenerateObjCMethod(const ObjCMethodDecl *OMD);
1540 void StartObjCMethod(const ObjCMethodDecl *MD, const ObjCContainerDecl *CD);
1542 /// GenerateObjCGetter - Synthesize an Objective-C property getter function.
1543 void GenerateObjCGetter(ObjCImplementationDecl *IMP,
1544 const ObjCPropertyImplDecl *PID);
1545 void generateObjCGetterBody(const ObjCImplementationDecl *classImpl,
1546 const ObjCPropertyImplDecl *propImpl,
1547 const ObjCMethodDecl *GetterMothodDecl,
1548 llvm::Constant *AtomicHelperFn);
1550 void GenerateObjCCtorDtorMethod(ObjCImplementationDecl *IMP,
1551 ObjCMethodDecl *MD, bool ctor);
1553 /// GenerateObjCSetter - Synthesize an Objective-C property setter function
1554 /// for the given property.
1555 void GenerateObjCSetter(ObjCImplementationDecl *IMP,
1556 const ObjCPropertyImplDecl *PID);
1557 void generateObjCSetterBody(const ObjCImplementationDecl *classImpl,
1558 const ObjCPropertyImplDecl *propImpl,
1559 llvm::Constant *AtomicHelperFn);
1561 //===--------------------------------------------------------------------===//
1563 //===--------------------------------------------------------------------===//
1565 llvm::Value *EmitBlockLiteral(const BlockExpr *);
1566 static void destroyBlockInfos(CGBlockInfo *info);
1568 llvm::Function *GenerateBlockFunction(GlobalDecl GD,
1569 const CGBlockInfo &Info,
1570 const DeclMapTy &ldm,
1571 bool IsLambdaConversionToBlock);
1573 llvm::Constant *GenerateCopyHelperFunction(const CGBlockInfo &blockInfo);
1574 llvm::Constant *GenerateDestroyHelperFunction(const CGBlockInfo &blockInfo);
1575 llvm::Constant *GenerateObjCAtomicSetterCopyHelperFunction(
1576 const ObjCPropertyImplDecl *PID);
1577 llvm::Constant *GenerateObjCAtomicGetterCopyHelperFunction(
1578 const ObjCPropertyImplDecl *PID);
1579 llvm::Value *EmitBlockCopyAndAutorelease(llvm::Value *Block, QualType Ty);
1581 void BuildBlockRelease(llvm::Value *DeclPtr, BlockFieldFlags flags);
1583 class AutoVarEmission;
1585 void emitByrefStructureInit(const AutoVarEmission &emission);
1586 void enterByrefCleanup(const AutoVarEmission &emission);
1588 void setBlockContextParameter(const ImplicitParamDecl *D, unsigned argNum,
1591 Address LoadBlockStruct();
1592 Address GetAddrOfBlockDecl(const VarDecl *var, bool ByRef);
1594 /// BuildBlockByrefAddress - Computes the location of the
1595 /// data in a variable which is declared as __block.
1596 Address emitBlockByrefAddress(Address baseAddr, const VarDecl *V,
1597 bool followForward = true);
1598 Address emitBlockByrefAddress(Address baseAddr,
1599 const BlockByrefInfo &info,
1601 const llvm::Twine &name);
1603 const BlockByrefInfo &getBlockByrefInfo(const VarDecl *var);
1605 QualType BuildFunctionArgList(GlobalDecl GD, FunctionArgList &Args);
1607 void GenerateCode(GlobalDecl GD, llvm::Function *Fn,
1608 const CGFunctionInfo &FnInfo);
1609 /// \brief Emit code for the start of a function.
1610 /// \param Loc The location to be associated with the function.
1611 /// \param StartLoc The location of the function body.
1612 void StartFunction(GlobalDecl GD,
1615 const CGFunctionInfo &FnInfo,
1616 const FunctionArgList &Args,
1617 SourceLocation Loc = SourceLocation(),
1618 SourceLocation StartLoc = SourceLocation());
1620 static bool IsConstructorDelegationValid(const CXXConstructorDecl *Ctor);
1622 void EmitConstructorBody(FunctionArgList &Args);
1623 void EmitDestructorBody(FunctionArgList &Args);
1624 void emitImplicitAssignmentOperatorBody(FunctionArgList &Args);
1625 void EmitFunctionBody(FunctionArgList &Args, const Stmt *Body);
1626 void EmitBlockWithFallThrough(llvm::BasicBlock *BB, const Stmt *S);
1628 void EmitForwardingCallToLambda(const CXXMethodDecl *LambdaCallOperator,
1629 CallArgList &CallArgs);
1630 void EmitLambdaToBlockPointerBody(FunctionArgList &Args);
1631 void EmitLambdaBlockInvokeBody();
1632 void EmitLambdaDelegatingInvokeBody(const CXXMethodDecl *MD);
1633 void EmitLambdaStaticInvokeFunction(const CXXMethodDecl *MD);
1634 void EmitAsanPrologueOrEpilogue(bool Prologue);
1636 /// \brief Emit the unified return block, trying to avoid its emission when
1638 /// \return The debug location of the user written return statement if the
1639 /// return block is is avoided.
1640 llvm::DebugLoc EmitReturnBlock();
1642 /// FinishFunction - Complete IR generation of the current function. It is
1643 /// legal to call this function even if there is no current insertion point.
1644 void FinishFunction(SourceLocation EndLoc=SourceLocation());
1646 void StartThunk(llvm::Function *Fn, GlobalDecl GD,
1647 const CGFunctionInfo &FnInfo);
1649 void EmitCallAndReturnForThunk(llvm::Constant *Callee,
1650 const ThunkInfo *Thunk);
1654 /// Emit a musttail call for a thunk with a potentially adjusted this pointer.
1655 void EmitMustTailThunk(const CXXMethodDecl *MD, llvm::Value *AdjustedThisPtr,
1656 llvm::Value *Callee);
1658 /// Generate a thunk for the given method.
1659 void generateThunk(llvm::Function *Fn, const CGFunctionInfo &FnInfo,
1660 GlobalDecl GD, const ThunkInfo &Thunk);
1662 llvm::Function *GenerateVarArgsThunk(llvm::Function *Fn,
1663 const CGFunctionInfo &FnInfo,
1664 GlobalDecl GD, const ThunkInfo &Thunk);
1666 void EmitCtorPrologue(const CXXConstructorDecl *CD, CXXCtorType Type,
1667 FunctionArgList &Args);
1669 void EmitInitializerForField(FieldDecl *Field, LValue LHS, Expr *Init);
1671 /// Struct with all informations about dynamic [sub]class needed to set vptr.
1674 const CXXRecordDecl *NearestVBase;
1675 CharUnits OffsetFromNearestVBase;
1676 const CXXRecordDecl *VTableClass;
1679 /// Initialize the vtable pointer of the given subobject.
1680 void InitializeVTablePointer(const VPtr &vptr);
1682 typedef llvm::SmallVector<VPtr, 4> VPtrsVector;
1684 typedef llvm::SmallPtrSet<const CXXRecordDecl *, 4> VisitedVirtualBasesSetTy;
1685 VPtrsVector getVTablePointers(const CXXRecordDecl *VTableClass);
1687 void getVTablePointers(BaseSubobject Base, const CXXRecordDecl *NearestVBase,
1688 CharUnits OffsetFromNearestVBase,
1689 bool BaseIsNonVirtualPrimaryBase,
1690 const CXXRecordDecl *VTableClass,
1691 VisitedVirtualBasesSetTy &VBases, VPtrsVector &vptrs);
1693 void InitializeVTablePointers(const CXXRecordDecl *ClassDecl);
1695 /// GetVTablePtr - Return the Value of the vtable pointer member pointed
1697 llvm::Value *GetVTablePtr(Address This, llvm::Type *VTableTy,
1698 const CXXRecordDecl *VTableClass);
1700 enum CFITypeCheckKind {
1704 CFITCK_UnrelatedCast,
1708 /// \brief Derived is the presumed address of an object of type T after a
1709 /// cast. If T is a polymorphic class type, emit a check that the virtual
1710 /// table for Derived belongs to a class derived from T.
1711 void EmitVTablePtrCheckForCast(QualType T, llvm::Value *Derived,
1712 bool MayBeNull, CFITypeCheckKind TCK,
1713 SourceLocation Loc);
1715 /// EmitVTablePtrCheckForCall - Virtual method MD is being called via VTable.
1716 /// If vptr CFI is enabled, emit a check that VTable is valid.
1717 void EmitVTablePtrCheckForCall(const CXXRecordDecl *RD, llvm::Value *VTable,
1718 CFITypeCheckKind TCK, SourceLocation Loc);
1720 /// EmitVTablePtrCheck - Emit a check that VTable is a valid virtual table for
1721 /// RD using llvm.type.test.
1722 void EmitVTablePtrCheck(const CXXRecordDecl *RD, llvm::Value *VTable,
1723 CFITypeCheckKind TCK, SourceLocation Loc);
1725 /// If whole-program virtual table optimization is enabled, emit an assumption
1726 /// that VTable is a member of RD's type identifier. Or, if vptr CFI is
1727 /// enabled, emit a check that VTable is a member of RD's type identifier.
1728 void EmitTypeMetadataCodeForVCall(const CXXRecordDecl *RD,
1729 llvm::Value *VTable, SourceLocation Loc);
1731 /// Returns whether we should perform a type checked load when loading a
1732 /// virtual function for virtual calls to members of RD. This is generally
1733 /// true when both vcall CFI and whole-program-vtables are enabled.
1734 bool ShouldEmitVTableTypeCheckedLoad(const CXXRecordDecl *RD);
1736 /// Emit a type checked load from the given vtable.
1737 llvm::Value *EmitVTableTypeCheckedLoad(const CXXRecordDecl *RD, llvm::Value *VTable,
1738 uint64_t VTableByteOffset);
1740 /// CanDevirtualizeMemberFunctionCalls - Checks whether virtual calls on given
1741 /// expr can be devirtualized.
1742 bool CanDevirtualizeMemberFunctionCall(const Expr *Base,
1743 const CXXMethodDecl *MD);
1745 /// EnterDtorCleanups - Enter the cleanups necessary to complete the
1746 /// given phase of destruction for a destructor. The end result
1747 /// should call destructors on members and base classes in reverse
1748 /// order of their construction.
1749 void EnterDtorCleanups(const CXXDestructorDecl *Dtor, CXXDtorType Type);
1751 /// ShouldInstrumentFunction - Return true if the current function should be
1752 /// instrumented with __cyg_profile_func_* calls
1753 bool ShouldInstrumentFunction();
1755 /// ShouldXRayInstrument - Return true if the current function should be
1756 /// instrumented with XRay nop sleds.
1757 bool ShouldXRayInstrumentFunction() const;
1759 /// EmitFunctionInstrumentation - Emit LLVM code to call the specified
1760 /// instrumentation function with the current function and the call site, if
1761 /// function instrumentation is enabled.
1762 void EmitFunctionInstrumentation(const char *Fn);
1764 /// EmitMCountInstrumentation - Emit call to .mcount.
1765 void EmitMCountInstrumentation();
1767 /// EmitFunctionProlog - Emit the target specific LLVM code to load the
1768 /// arguments for the given function. This is also responsible for naming the
1769 /// LLVM function arguments.
1770 void EmitFunctionProlog(const CGFunctionInfo &FI,
1772 const FunctionArgList &Args);
1774 /// EmitFunctionEpilog - Emit the target specific LLVM code to return the
1775 /// given temporary.
1776 void EmitFunctionEpilog(const CGFunctionInfo &FI, bool EmitRetDbgLoc,
1777 SourceLocation EndLoc);
1779 /// Emit a test that checks if the return value \p RV is nonnull.
1780 void EmitReturnValueCheck(llvm::Value *RV, SourceLocation EndLoc);
1782 /// EmitStartEHSpec - Emit the start of the exception spec.
1783 void EmitStartEHSpec(const Decl *D);
1785 /// EmitEndEHSpec - Emit the end of the exception spec.
1786 void EmitEndEHSpec(const Decl *D);
1788 /// getTerminateLandingPad - Return a landing pad that just calls terminate.
1789 llvm::BasicBlock *getTerminateLandingPad();
1791 /// getTerminateHandler - Return a handler (not a landing pad, just
1792 /// a catch handler) that just calls terminate. This is used when
1793 /// a terminate scope encloses a try.
1794 llvm::BasicBlock *getTerminateHandler();
1796 llvm::Type *ConvertTypeForMem(QualType T);
1797 llvm::Type *ConvertType(QualType T);
1798 llvm::Type *ConvertType(const TypeDecl *T) {
1799 return ConvertType(getContext().getTypeDeclType(T));
1802 /// LoadObjCSelf - Load the value of self. This function is only valid while
1803 /// generating code for an Objective-C method.
1804 llvm::Value *LoadObjCSelf();
1806 /// TypeOfSelfObject - Return type of object that this self represents.
1807 QualType TypeOfSelfObject();
1809 /// hasAggregateLLVMType - Return true if the specified AST type will map into
1810 /// an aggregate LLVM type or is void.
1811 static TypeEvaluationKind getEvaluationKind(QualType T);
1813 static bool hasScalarEvaluationKind(QualType T) {
1814 return getEvaluationKind(T) == TEK_Scalar;
1817 static bool hasAggregateEvaluationKind(QualType T) {
1818 return getEvaluationKind(T) == TEK_Aggregate;
1821 /// createBasicBlock - Create an LLVM basic block.
1822 llvm::BasicBlock *createBasicBlock(const Twine &name = "",
1823 llvm::Function *parent = nullptr,
1824 llvm::BasicBlock *before = nullptr) {
1826 return llvm::BasicBlock::Create(getLLVMContext(), "", parent, before);
1828 return llvm::BasicBlock::Create(getLLVMContext(), name, parent, before);
1832 /// getBasicBlockForLabel - Return the LLVM basicblock that the specified
1834 JumpDest getJumpDestForLabel(const LabelDecl *S);
1836 /// SimplifyForwardingBlocks - If the given basic block is only a branch to
1837 /// another basic block, simplify it. This assumes that no other code could
1838 /// potentially reference the basic block.
1839 void SimplifyForwardingBlocks(llvm::BasicBlock *BB);
1841 /// EmitBlock - Emit the given block \arg BB and set it as the insert point,
1842 /// adding a fall-through branch from the current insert block if
1843 /// necessary. It is legal to call this function even if there is no current
1844 /// insertion point.
1846 /// IsFinished - If true, indicates that the caller has finished emitting
1847 /// branches to the given block and does not expect to emit code into it. This
1848 /// means the block can be ignored if it is unreachable.
1849 void EmitBlock(llvm::BasicBlock *BB, bool IsFinished=false);
1851 /// EmitBlockAfterUses - Emit the given block somewhere hopefully
1852 /// near its uses, and leave the insertion point in it.
1853 void EmitBlockAfterUses(llvm::BasicBlock *BB);
1855 /// EmitBranch - Emit a branch to the specified basic block from the current
1856 /// insert block, taking care to avoid creation of branches from dummy
1857 /// blocks. It is legal to call this function even if there is no current
1858 /// insertion point.
1860 /// This function clears the current insertion point. The caller should follow
1861 /// calls to this function with calls to Emit*Block prior to generation new
1863 void EmitBranch(llvm::BasicBlock *Block);
1865 /// HaveInsertPoint - True if an insertion point is defined. If not, this
1866 /// indicates that the current code being emitted is unreachable.
1867 bool HaveInsertPoint() const {
1868 return Builder.GetInsertBlock() != nullptr;
1871 /// EnsureInsertPoint - Ensure that an insertion point is defined so that
1872 /// emitted IR has a place to go. Note that by definition, if this function
1873 /// creates a block then that block is unreachable; callers may do better to
1874 /// detect when no insertion point is defined and simply skip IR generation.
1875 void EnsureInsertPoint() {
1876 if (!HaveInsertPoint())
1877 EmitBlock(createBasicBlock());
1880 /// ErrorUnsupported - Print out an error that codegen doesn't support the
1881 /// specified stmt yet.
1882 void ErrorUnsupported(const Stmt *S, const char *Type);
1884 //===--------------------------------------------------------------------===//
1886 //===--------------------------------------------------------------------===//
1888 LValue MakeAddrLValue(Address Addr, QualType T,
1889 AlignmentSource AlignSource = AlignmentSource::Type) {
1890 return LValue::MakeAddr(Addr, T, getContext(), AlignSource,
1891 CGM.getTBAAInfo(T));
1894 LValue MakeAddrLValue(llvm::Value *V, QualType T, CharUnits Alignment,
1895 AlignmentSource AlignSource = AlignmentSource::Type) {
1896 return LValue::MakeAddr(Address(V, Alignment), T, getContext(),
1897 AlignSource, CGM.getTBAAInfo(T));
1900 LValue MakeNaturalAlignPointeeAddrLValue(llvm::Value *V, QualType T);
1901 LValue MakeNaturalAlignAddrLValue(llvm::Value *V, QualType T);
1902 CharUnits getNaturalTypeAlignment(QualType T,
1903 AlignmentSource *Source = nullptr,
1904 bool forPointeeType = false);
1905 CharUnits getNaturalPointeeTypeAlignment(QualType T,
1906 AlignmentSource *Source = nullptr);
1908 Address EmitLoadOfReference(Address Ref, const ReferenceType *RefTy,
1909 AlignmentSource *Source = nullptr);
1910 LValue EmitLoadOfReferenceLValue(Address Ref, const ReferenceType *RefTy);
1912 Address EmitLoadOfPointer(Address Ptr, const PointerType *PtrTy,
1913 AlignmentSource *Source = nullptr);
1914 LValue EmitLoadOfPointerLValue(Address Ptr, const PointerType *PtrTy);
1916 /// CreateTempAlloca - This creates a alloca and inserts it into the entry
1917 /// block. The caller is responsible for setting an appropriate alignment on
1919 llvm::AllocaInst *CreateTempAlloca(llvm::Type *Ty,
1920 const Twine &Name = "tmp");
1921 Address CreateTempAlloca(llvm::Type *Ty, CharUnits align,
1922 const Twine &Name = "tmp");
1924 /// CreateDefaultAlignedTempAlloca - This creates an alloca with the
1925 /// default ABI alignment of the given LLVM type.
1927 /// IMPORTANT NOTE: This is *not* generally the right alignment for
1928 /// any given AST type that happens to have been lowered to the
1929 /// given IR type. This should only ever be used for function-local,
1930 /// IR-driven manipulations like saving and restoring a value. Do
1931 /// not hand this address off to arbitrary IRGen routines, and especially
1932 /// do not pass it as an argument to a function that might expect a
1933 /// properly ABI-aligned value.
1934 Address CreateDefaultAlignTempAlloca(llvm::Type *Ty,
1935 const Twine &Name = "tmp");
1937 /// InitTempAlloca - Provide an initial value for the given alloca which
1938 /// will be observable at all locations in the function.
1940 /// The address should be something that was returned from one of
1941 /// the CreateTempAlloca or CreateMemTemp routines, and the
1942 /// initializer must be valid in the entry block (i.e. it must
1943 /// either be a constant or an argument value).
1944 void InitTempAlloca(Address Alloca, llvm::Value *Value);
1946 /// CreateIRTemp - Create a temporary IR object of the given type, with
1947 /// appropriate alignment. This routine should only be used when an temporary
1948 /// value needs to be stored into an alloca (for example, to avoid explicit
1949 /// PHI construction), but the type is the IR type, not the type appropriate
1950 /// for storing in memory.
1952 /// That is, this is exactly equivalent to CreateMemTemp, but calling
1953 /// ConvertType instead of ConvertTypeForMem.
1954 Address CreateIRTemp(QualType T, const Twine &Name = "tmp");
1956 /// CreateMemTemp - Create a temporary memory object of the given type, with
1957 /// appropriate alignment.
1958 Address CreateMemTemp(QualType T, const Twine &Name = "tmp");
1959 Address CreateMemTemp(QualType T, CharUnits Align, const Twine &Name = "tmp");
1961 /// CreateAggTemp - Create a temporary memory object for the given
1963 AggValueSlot CreateAggTemp(QualType T, const Twine &Name = "tmp") {
1964 return AggValueSlot::forAddr(CreateMemTemp(T, Name),
1966 AggValueSlot::IsNotDestructed,
1967 AggValueSlot::DoesNotNeedGCBarriers,
1968 AggValueSlot::IsNotAliased);
1971 /// Emit a cast to void* in the appropriate address space.
1972 llvm::Value *EmitCastToVoidPtr(llvm::Value *value);
1974 /// EvaluateExprAsBool - Perform the usual unary conversions on the specified
1975 /// expression and compare the result against zero, returning an Int1Ty value.
1976 llvm::Value *EvaluateExprAsBool(const Expr *E);
1978 /// EmitIgnoredExpr - Emit an expression in a context which ignores the result.
1979 void EmitIgnoredExpr(const Expr *E);
1981 /// EmitAnyExpr - Emit code to compute the specified expression which can have
1982 /// any type. The result is returned as an RValue struct. If this is an
1983 /// aggregate expression, the aggloc/agglocvolatile arguments indicate where
1984 /// the result should be returned.
1986 /// \param ignoreResult True if the resulting value isn't used.
1987 RValue EmitAnyExpr(const Expr *E,
1988 AggValueSlot aggSlot = AggValueSlot::ignored(),
1989 bool ignoreResult = false);
1991 // EmitVAListRef - Emit a "reference" to a va_list; this is either the address
1992 // or the value of the expression, depending on how va_list is defined.
1993 Address EmitVAListRef(const Expr *E);
1995 /// Emit a "reference" to a __builtin_ms_va_list; this is
1996 /// always the value of the expression, because a __builtin_ms_va_list is a
1997 /// pointer to a char.
1998 Address EmitMSVAListRef(const Expr *E);
2000 /// EmitAnyExprToTemp - Similarly to EmitAnyExpr(), however, the result will
2001 /// always be accessible even if no aggregate location is provided.
2002 RValue EmitAnyExprToTemp(const Expr *E);
2004 /// EmitAnyExprToMem - Emits the code necessary to evaluate an
2005 /// arbitrary expression into the given memory location.
2006 void EmitAnyExprToMem(const Expr *E, Address Location,
2007 Qualifiers Quals, bool IsInitializer);
2009 void EmitAnyExprToExn(const Expr *E, Address Addr);
2011 /// EmitExprAsInit - Emits the code necessary to initialize a
2012 /// location in memory with the given initializer.
2013 void EmitExprAsInit(const Expr *init, const ValueDecl *D, LValue lvalue,
2014 bool capturedByInit);
2016 /// hasVolatileMember - returns true if aggregate type has a volatile
2018 bool hasVolatileMember(QualType T) {
2019 if (const RecordType *RT = T->getAs<RecordType>()) {
2020 const RecordDecl *RD = cast<RecordDecl>(RT->getDecl());
2021 return RD->hasVolatileMember();
2025 /// EmitAggregateCopy - Emit an aggregate assignment.
2027 /// The difference to EmitAggregateCopy is that tail padding is not copied.
2028 /// This is required for correctness when assigning non-POD structures in C++.
2029 void EmitAggregateAssign(Address DestPtr, Address SrcPtr,
2031 bool IsVolatile = hasVolatileMember(EltTy);
2032 EmitAggregateCopy(DestPtr, SrcPtr, EltTy, IsVolatile, true);
2035 void EmitAggregateCopyCtor(Address DestPtr, Address SrcPtr,
2036 QualType DestTy, QualType SrcTy) {
2037 EmitAggregateCopy(DestPtr, SrcPtr, SrcTy, /*IsVolatile=*/false,
2038 /*IsAssignment=*/false);
2041 /// EmitAggregateCopy - Emit an aggregate copy.
2043 /// \param isVolatile - True iff either the source or the destination is
2045 /// \param isAssignment - If false, allow padding to be copied. This often
2046 /// yields more efficient.
2047 void EmitAggregateCopy(Address DestPtr, Address SrcPtr,
2048 QualType EltTy, bool isVolatile=false,
2049 bool isAssignment = false);
2051 /// GetAddrOfLocalVar - Return the address of a local variable.
2052 Address GetAddrOfLocalVar(const VarDecl *VD) {
2053 auto it = LocalDeclMap.find(VD);
2054 assert(it != LocalDeclMap.end() &&
2055 "Invalid argument to GetAddrOfLocalVar(), no decl!");
2059 /// getOpaqueLValueMapping - Given an opaque value expression (which
2060 /// must be mapped to an l-value), return its mapping.
2061 const LValue &getOpaqueLValueMapping(const OpaqueValueExpr *e) {
2062 assert(OpaqueValueMapping::shouldBindAsLValue(e));
2064 llvm::DenseMap<const OpaqueValueExpr*,LValue>::iterator
2065 it = OpaqueLValues.find(e);
2066 assert(it != OpaqueLValues.end() && "no mapping for opaque value!");
2070 /// getOpaqueRValueMapping - Given an opaque value expression (which
2071 /// must be mapped to an r-value), return its mapping.
2072 const RValue &getOpaqueRValueMapping(const OpaqueValueExpr *e) {
2073 assert(!OpaqueValueMapping::shouldBindAsLValue(e));
2075 llvm::DenseMap<const OpaqueValueExpr*,RValue>::iterator
2076 it = OpaqueRValues.find(e);
2077 assert(it != OpaqueRValues.end() && "no mapping for opaque value!");
2081 /// Get the index of the current ArrayInitLoopExpr, if any.
2082 llvm::Value *getArrayInitIndex() { return ArrayInitIndex; }
2084 /// getAccessedFieldNo - Given an encoded value and a result number, return
2085 /// the input field number being accessed.
2086 static unsigned getAccessedFieldNo(unsigned Idx, const llvm::Constant *Elts);
2088 llvm::BlockAddress *GetAddrOfLabel(const LabelDecl *L);
2089 llvm::BasicBlock *GetIndirectGotoBlock();
2091 /// Check if \p E is a C++ "this" pointer wrapped in value-preserving casts.
2092 static bool IsWrappedCXXThis(const Expr *E);
2094 /// EmitNullInitialization - Generate code to set a value of the given type to
2095 /// null, If the type contains data member pointers, they will be initialized
2096 /// to -1 in accordance with the Itanium C++ ABI.
2097 void EmitNullInitialization(Address DestPtr, QualType Ty);
2099 /// Emits a call to an LLVM variable-argument intrinsic, either
2100 /// \c llvm.va_start or \c llvm.va_end.
2101 /// \param ArgValue A reference to the \c va_list as emitted by either
2102 /// \c EmitVAListRef or \c EmitMSVAListRef.
2103 /// \param IsStart If \c true, emits a call to \c llvm.va_start; otherwise,
2104 /// calls \c llvm.va_end.
2105 llvm::Value *EmitVAStartEnd(llvm::Value *ArgValue, bool IsStart);
2107 /// Generate code to get an argument from the passed in pointer
2108 /// and update it accordingly.
2109 /// \param VE The \c VAArgExpr for which to generate code.
2110 /// \param VAListAddr Receives a reference to the \c va_list as emitted by
2111 /// either \c EmitVAListRef or \c EmitMSVAListRef.
2112 /// \returns A pointer to the argument.
2113 // FIXME: We should be able to get rid of this method and use the va_arg
2114 // instruction in LLVM instead once it works well enough.
2115 Address EmitVAArg(VAArgExpr *VE, Address &VAListAddr);
2117 /// emitArrayLength - Compute the length of an array, even if it's a
2118 /// VLA, and drill down to the base element type.
2119 llvm::Value *emitArrayLength(const ArrayType *arrayType,
2123 /// EmitVLASize - Capture all the sizes for the VLA expressions in
2124 /// the given variably-modified type and store them in the VLASizeMap.
2126 /// This function can be called with a null (unreachable) insert point.
2127 void EmitVariablyModifiedType(QualType Ty);
2129 /// getVLASize - Returns an LLVM value that corresponds to the size,
2130 /// in non-variably-sized elements, of a variable length array type,
2131 /// plus that largest non-variably-sized element type. Assumes that
2132 /// the type has already been emitted with EmitVariablyModifiedType.
2133 std::pair<llvm::Value*,QualType> getVLASize(const VariableArrayType *vla);
2134 std::pair<llvm::Value*,QualType> getVLASize(QualType vla);
2136 /// LoadCXXThis - Load the value of 'this'. This function is only valid while
2137 /// generating code for an C++ member function.
2138 llvm::Value *LoadCXXThis() {
2139 assert(CXXThisValue && "no 'this' value for this function");
2140 return CXXThisValue;
2142 Address LoadCXXThisAddress();
2144 /// LoadCXXVTT - Load the VTT parameter to base constructors/destructors have
2146 // FIXME: Every place that calls LoadCXXVTT is something
2147 // that needs to be abstracted properly.
2148 llvm::Value *LoadCXXVTT() {
2149 assert(CXXStructorImplicitParamValue && "no VTT value for this function");
2150 return CXXStructorImplicitParamValue;
2153 /// GetAddressOfBaseOfCompleteClass - Convert the given pointer to a
2154 /// complete class to the given direct base.
2156 GetAddressOfDirectBaseInCompleteClass(Address Value,
2157 const CXXRecordDecl *Derived,
2158 const CXXRecordDecl *Base,
2159 bool BaseIsVirtual);
2161 static bool ShouldNullCheckClassCastValue(const CastExpr *Cast);
2163 /// GetAddressOfBaseClass - This function will add the necessary delta to the
2164 /// load of 'this' and returns address of the base class.
2165 Address GetAddressOfBaseClass(Address Value,
2166 const CXXRecordDecl *Derived,
2167 CastExpr::path_const_iterator PathBegin,
2168 CastExpr::path_const_iterator PathEnd,
2169 bool NullCheckValue, SourceLocation Loc);
2171 Address GetAddressOfDerivedClass(Address Value,
2172 const CXXRecordDecl *Derived,
2173 CastExpr::path_const_iterator PathBegin,
2174 CastExpr::path_const_iterator PathEnd,
2175 bool NullCheckValue);
2177 /// GetVTTParameter - Return the VTT parameter that should be passed to a
2178 /// base constructor/destructor with virtual bases.
2179 /// FIXME: VTTs are Itanium ABI-specific, so the definition should move
2180 /// to ItaniumCXXABI.cpp together with all the references to VTT.
2181 llvm::Value *GetVTTParameter(GlobalDecl GD, bool ForVirtualBase,
2184 void EmitDelegateCXXConstructorCall(const CXXConstructorDecl *Ctor,
2185 CXXCtorType CtorType,
2186 const FunctionArgList &Args,
2187 SourceLocation Loc);
2188 // It's important not to confuse this and the previous function. Delegating
2189 // constructors are the C++0x feature. The constructor delegate optimization
2190 // is used to reduce duplication in the base and complete consturctors where
2191 // they are substantially the same.
2192 void EmitDelegatingCXXConstructorCall(const CXXConstructorDecl *Ctor,
2193 const FunctionArgList &Args);
2195 /// Emit a call to an inheriting constructor (that is, one that invokes a
2196 /// constructor inherited from a base class) by inlining its definition. This
2197 /// is necessary if the ABI does not support forwarding the arguments to the
2198 /// base class constructor (because they're variadic or similar).
2199 void EmitInlinedInheritingCXXConstructorCall(const CXXConstructorDecl *Ctor,
2200 CXXCtorType CtorType,
2201 bool ForVirtualBase,
2205 /// Emit a call to a constructor inherited from a base class, passing the
2206 /// current constructor's arguments along unmodified (without even making
2208 void EmitInheritedCXXConstructorCall(const CXXConstructorDecl *D,
2209 bool ForVirtualBase, Address This,
2210 bool InheritedFromVBase,
2211 const CXXInheritedCtorInitExpr *E);
2213 void EmitCXXConstructorCall(const CXXConstructorDecl *D, CXXCtorType Type,
2214 bool ForVirtualBase, bool Delegating,
2215 Address This, const CXXConstructExpr *E);
2217 void EmitCXXConstructorCall(const CXXConstructorDecl *D, CXXCtorType Type,
2218 bool ForVirtualBase, bool Delegating,
2219 Address This, CallArgList &Args);
2221 /// Emit assumption load for all bases. Requires to be be called only on
2222 /// most-derived class and not under construction of the object.
2223 void EmitVTableAssumptionLoads(const CXXRecordDecl *ClassDecl, Address This);
2225 /// Emit assumption that vptr load == global vtable.
2226 void EmitVTableAssumptionLoad(const VPtr &vptr, Address This);
2228 void EmitSynthesizedCXXCopyCtorCall(const CXXConstructorDecl *D,
2229 Address This, Address Src,
2230 const CXXConstructExpr *E);
2232 void EmitCXXAggrConstructorCall(const CXXConstructorDecl *D,
2233 const ArrayType *ArrayTy,
2235 const CXXConstructExpr *E,
2236 bool ZeroInitialization = false);
2238 void EmitCXXAggrConstructorCall(const CXXConstructorDecl *D,
2239 llvm::Value *NumElements,
2241 const CXXConstructExpr *E,
2242 bool ZeroInitialization = false);
2244 static Destroyer destroyCXXObject;
2246 void EmitCXXDestructorCall(const CXXDestructorDecl *D, CXXDtorType Type,
2247 bool ForVirtualBase, bool Delegating,
2250 void EmitNewArrayInitializer(const CXXNewExpr *E, QualType elementType,
2251 llvm::Type *ElementTy, Address NewPtr,
2252 llvm::Value *NumElements,
2253 llvm::Value *AllocSizeWithoutCookie);
2255 void EmitCXXTemporary(const CXXTemporary *Temporary, QualType TempType,
2258 llvm::Value *EmitLifetimeStart(uint64_t Size, llvm::Value *Addr);
2259 void EmitLifetimeEnd(llvm::Value *Size, llvm::Value *Addr);
2261 llvm::Value *EmitCXXNewExpr(const CXXNewExpr *E);
2262 void EmitCXXDeleteExpr(const CXXDeleteExpr *E);
2264 void EmitDeleteCall(const FunctionDecl *DeleteFD, llvm::Value *Ptr,
2265 QualType DeleteTy, llvm::Value *NumElements = nullptr,
2266 CharUnits CookieSize = CharUnits());
2268 RValue EmitBuiltinNewDeleteCall(const FunctionProtoType *Type,
2269 const Expr *Arg, bool IsDelete);
2271 llvm::Value *EmitCXXTypeidExpr(const CXXTypeidExpr *E);
2272 llvm::Value *EmitDynamicCast(Address V, const CXXDynamicCastExpr *DCE);
2273 Address EmitCXXUuidofExpr(const CXXUuidofExpr *E);
2275 /// \brief Situations in which we might emit a check for the suitability of a
2276 /// pointer or glvalue.
2277 enum TypeCheckKind {
2278 /// Checking the operand of a load. Must be suitably sized and aligned.
2280 /// Checking the destination of a store. Must be suitably sized and aligned.
2282 /// Checking the bound value in a reference binding. Must be suitably sized
2283 /// and aligned, but is not required to refer to an object (until the
2284 /// reference is used), per core issue 453.
2285 TCK_ReferenceBinding,
2286 /// Checking the object expression in a non-static data member access. Must
2287 /// be an object within its lifetime.
2289 /// Checking the 'this' pointer for a call to a non-static member function.
2290 /// Must be an object within its lifetime.
2292 /// Checking the 'this' pointer for a constructor call.
2293 TCK_ConstructorCall,
2294 /// Checking the operand of a static_cast to a derived pointer type. Must be
2295 /// null or an object within its lifetime.
2296 TCK_DowncastPointer,
2297 /// Checking the operand of a static_cast to a derived reference type. Must
2298 /// be an object within its lifetime.
2299 TCK_DowncastReference,
2300 /// Checking the operand of a cast to a base object. Must be suitably sized
2303 /// Checking the operand of a cast to a virtual base object. Must be an
2304 /// object within its lifetime.
2305 TCK_UpcastToVirtualBase,
2306 /// Checking the value assigned to a _Nonnull pointer. Must not be null.
2310 /// \brief Whether any type-checking sanitizers are enabled. If \c false,
2311 /// calls to EmitTypeCheck can be skipped.
2312 bool sanitizePerformTypeCheck() const;
2314 /// \brief Emit a check that \p V is the address of storage of the
2315 /// appropriate size and alignment for an object of type \p Type.
2316 void EmitTypeCheck(TypeCheckKind TCK, SourceLocation Loc, llvm::Value *V,
2317 QualType Type, CharUnits Alignment = CharUnits::Zero(),
2318 SanitizerSet SkippedChecks = SanitizerSet());
2320 /// \brief Emit a check that \p Base points into an array object, which
2321 /// we can access at index \p Index. \p Accessed should be \c false if we
2322 /// this expression is used as an lvalue, for instance in "&Arr[Idx]".
2323 void EmitBoundsCheck(const Expr *E, const Expr *Base, llvm::Value *Index,
2324 QualType IndexType, bool Accessed);
2326 llvm::Value *EmitScalarPrePostIncDec(const UnaryOperator *E, LValue LV,
2327 bool isInc, bool isPre);
2328 ComplexPairTy EmitComplexPrePostIncDec(const UnaryOperator *E, LValue LV,
2329 bool isInc, bool isPre);
2331 void EmitAlignmentAssumption(llvm::Value *PtrValue, unsigned Alignment,
2332 llvm::Value *OffsetValue = nullptr) {
2333 Builder.CreateAlignmentAssumption(CGM.getDataLayout(), PtrValue, Alignment,
2337 /// Converts Location to a DebugLoc, if debug information is enabled.
2338 llvm::DebugLoc SourceLocToDebugLoc(SourceLocation Location);
2341 //===--------------------------------------------------------------------===//
2342 // Declaration Emission
2343 //===--------------------------------------------------------------------===//
2345 /// EmitDecl - Emit a declaration.
2347 /// This function can be called with a null (unreachable) insert point.
2348 void EmitDecl(const Decl &D);
2350 /// EmitVarDecl - Emit a local variable declaration.
2352 /// This function can be called with a null (unreachable) insert point.
2353 void EmitVarDecl(const VarDecl &D);
2355 void EmitScalarInit(const Expr *init, const ValueDecl *D, LValue lvalue,
2356 bool capturedByInit);
2358 typedef void SpecialInitFn(CodeGenFunction &Init, const VarDecl &D,
2359 llvm::Value *Address);
2361 /// \brief Determine whether the given initializer is trivial in the sense
2362 /// that it requires no code to be generated.
2363 bool isTrivialInitializer(const Expr *Init);
2365 /// EmitAutoVarDecl - Emit an auto variable declaration.
2367 /// This function can be called with a null (unreachable) insert point.
2368 void EmitAutoVarDecl(const VarDecl &D);
2370 class AutoVarEmission {
2371 friend class CodeGenFunction;
2373 const VarDecl *Variable;
2375 /// The address of the alloca. Invalid if the variable was emitted
2376 /// as a global constant.
2379 llvm::Value *NRVOFlag;
2381 /// True if the variable is a __block variable.
2384 /// True if the variable is of aggregate type and has a constant
2386 bool IsConstantAggregate;
2388 /// Non-null if we should use lifetime annotations.
2389 llvm::Value *SizeForLifetimeMarkers;
2392 AutoVarEmission(Invalid) : Variable(nullptr), Addr(Address::invalid()) {}
2394 AutoVarEmission(const VarDecl &variable)
2395 : Variable(&variable), Addr(Address::invalid()), NRVOFlag(nullptr),
2396 IsByRef(false), IsConstantAggregate(false),
2397 SizeForLifetimeMarkers(nullptr) {}
2399 bool wasEmittedAsGlobal() const { return !Addr.isValid(); }
2402 static AutoVarEmission invalid() { return AutoVarEmission(Invalid()); }
2404 bool useLifetimeMarkers() const {
2405 return SizeForLifetimeMarkers != nullptr;
2407 llvm::Value *getSizeForLifetimeMarkers() const {
2408 assert(useLifetimeMarkers());
2409 return SizeForLifetimeMarkers;
2412 /// Returns the raw, allocated address, which is not necessarily
2413 /// the address of the object itself.
2414 Address getAllocatedAddress() const {
2418 /// Returns the address of the object within this declaration.
2419 /// Note that this does not chase the forwarding pointer for
2421 Address getObjectAddress(CodeGenFunction &CGF) const {
2422 if (!IsByRef) return Addr;
2424 return CGF.emitBlockByrefAddress(Addr, Variable, /*forward*/ false);
2427 AutoVarEmission EmitAutoVarAlloca(const VarDecl &var);
2428 void EmitAutoVarInit(const AutoVarEmission &emission);
2429 void EmitAutoVarCleanups(const AutoVarEmission &emission);
2430 void emitAutoVarTypeCleanup(const AutoVarEmission &emission,
2431 QualType::DestructionKind dtorKind);
2433 void EmitStaticVarDecl(const VarDecl &D,
2434 llvm::GlobalValue::LinkageTypes Linkage);
2439 ParamValue(llvm::Value *V, unsigned A) : Value(V), Alignment(A) {}
2441 static ParamValue forDirect(llvm::Value *value) {
2442 return ParamValue(value, 0);
2444 static ParamValue forIndirect(Address addr) {
2445 assert(!addr.getAlignment().isZero());
2446 return ParamValue(addr.getPointer(), addr.getAlignment().getQuantity());
2449 bool isIndirect() const { return Alignment != 0; }
2450 llvm::Value *getAnyValue() const { return Value; }
2452 llvm::Value *getDirectValue() const {
2453 assert(!isIndirect());
2457 Address getIndirectAddress() const {
2458 assert(isIndirect());
2459 return Address(Value, CharUnits::fromQuantity(Alignment));
2463 /// EmitParmDecl - Emit a ParmVarDecl or an ImplicitParamDecl.
2464 void EmitParmDecl(const VarDecl &D, ParamValue Arg, unsigned ArgNo);
2466 /// protectFromPeepholes - Protect a value that we're intending to
2467 /// store to the side, but which will probably be used later, from
2468 /// aggressive peepholing optimizations that might delete it.
2470 /// Pass the result to unprotectFromPeepholes to declare that
2471 /// protection is no longer required.
2473 /// There's no particular reason why this shouldn't apply to
2474 /// l-values, it's just that no existing peepholes work on pointers.
2475 PeepholeProtection protectFromPeepholes(RValue rvalue);
2476 void unprotectFromPeepholes(PeepholeProtection protection);
2478 void EmitAlignmentAssumption(llvm::Value *PtrValue, llvm::Value *Alignment,
2479 llvm::Value *OffsetValue = nullptr) {
2480 Builder.CreateAlignmentAssumption(CGM.getDataLayout(), PtrValue, Alignment,
2484 //===--------------------------------------------------------------------===//
2485 // Statement Emission
2486 //===--------------------------------------------------------------------===//
2488 /// EmitStopPoint - Emit a debug stoppoint if we are emitting debug info.
2489 void EmitStopPoint(const Stmt *S);
2491 /// EmitStmt - Emit the code for the statement \arg S. It is legal to call
2492 /// this function even if there is no current insertion point.
2494 /// This function may clear the current insertion point; callers should use
2495 /// EnsureInsertPoint if they wish to subsequently generate code without first
2496 /// calling EmitBlock, EmitBranch, or EmitStmt.
2497 void EmitStmt(const Stmt *S);
2499 /// EmitSimpleStmt - Try to emit a "simple" statement which does not
2500 /// necessarily require an insertion point or debug information; typically
2501 /// because the statement amounts to a jump or a container of other
2504 /// \return True if the statement was handled.
2505 bool EmitSimpleStmt(const Stmt *S);
2507 Address EmitCompoundStmt(const CompoundStmt &S, bool GetLast = false,
2508 AggValueSlot AVS = AggValueSlot::ignored());
2509 Address EmitCompoundStmtWithoutScope(const CompoundStmt &S,
2510 bool GetLast = false,
2512 AggValueSlot::ignored());
2514 /// EmitLabel - Emit the block for the given label. It is legal to call this
2515 /// function even if there is no current insertion point.
2516 void EmitLabel(const LabelDecl *D); // helper for EmitLabelStmt.
2518 void EmitLabelStmt(const LabelStmt &S);
2519 void EmitAttributedStmt(const AttributedStmt &S);
2520 void EmitGotoStmt(const GotoStmt &S);
2521 void EmitIndirectGotoStmt(const IndirectGotoStmt &S);
2522 void EmitIfStmt(const IfStmt &S);
2524 void EmitWhileStmt(const WhileStmt &S,
2525 ArrayRef<const Attr *> Attrs = None);
2526 void EmitDoStmt(const DoStmt &S, ArrayRef<const Attr *> Attrs = None);
2527 void EmitForStmt(const ForStmt &S,
2528 ArrayRef<const Attr *> Attrs = None);
2529 void EmitReturnStmt(const ReturnStmt &S);
2530 void EmitDeclStmt(const DeclStmt &S);
2531 void EmitBreakStmt(const BreakStmt &S);
2532 void EmitContinueStmt(const ContinueStmt &S);
2533 void EmitSwitchStmt(const SwitchStmt &S);
2534 void EmitDefaultStmt(const DefaultStmt &S);
2535 void EmitCaseStmt(const CaseStmt &S);
2536 void EmitCaseStmtRange(const CaseStmt &S);
2537 void EmitAsmStmt(const AsmStmt &S);
2539 void EmitObjCForCollectionStmt(const ObjCForCollectionStmt &S);
2540 void EmitObjCAtTryStmt(const ObjCAtTryStmt &S);
2541 void EmitObjCAtThrowStmt(const ObjCAtThrowStmt &S);
2542 void EmitObjCAtSynchronizedStmt(const ObjCAtSynchronizedStmt &S);
2543 void EmitObjCAutoreleasePoolStmt(const ObjCAutoreleasePoolStmt &S);
2545 void EmitCoroutineBody(const CoroutineBodyStmt &S);
2546 void EmitCoreturnStmt(const CoreturnStmt &S);
2547 RValue EmitCoawaitExpr(const CoawaitExpr &E,
2548 AggValueSlot aggSlot = AggValueSlot::ignored(),
2549 bool ignoreResult = false);
2550 RValue EmitCoyieldExpr(const CoyieldExpr &E,
2551 AggValueSlot aggSlot = AggValueSlot::ignored(),
2552 bool ignoreResult = false);
2553 RValue EmitCoroutineIntrinsic(const CallExpr *E, unsigned int IID);
2555 void EnterCXXTryStmt(const CXXTryStmt &S, bool IsFnTryBlock = false);
2556 void ExitCXXTryStmt(const CXXTryStmt &S, bool IsFnTryBlock = false);
2558 void EmitCXXTryStmt(const CXXTryStmt &S);
2559 void EmitSEHTryStmt(const SEHTryStmt &S);
2560 void EmitSEHLeaveStmt(const SEHLeaveStmt &S);
2561 void EnterSEHTryStmt(const SEHTryStmt &S);
2562 void ExitSEHTryStmt(const SEHTryStmt &S);
2564 void startOutlinedSEHHelper(CodeGenFunction &ParentCGF, bool IsFilter,
2565 const Stmt *OutlinedStmt);
2567 llvm::Function *GenerateSEHFilterFunction(CodeGenFunction &ParentCGF,
2568 const SEHExceptStmt &Except);
2570 llvm::Function *GenerateSEHFinallyFunction(CodeGenFunction &ParentCGF,
2571 const SEHFinallyStmt &Finally);
2573 void EmitSEHExceptionCodeSave(CodeGenFunction &ParentCGF,
2574 llvm::Value *ParentFP,
2575 llvm::Value *EntryEBP);
2576 llvm::Value *EmitSEHExceptionCode();
2577 llvm::Value *EmitSEHExceptionInfo();
2578 llvm::Value *EmitSEHAbnormalTermination();
2580 /// Scan the outlined statement for captures from the parent function. For
2581 /// each capture, mark the capture as escaped and emit a call to
2582 /// llvm.localrecover. Insert the localrecover result into the LocalDeclMap.
2583 void EmitCapturedLocals(CodeGenFunction &ParentCGF, const Stmt *OutlinedStmt,
2586 /// Recovers the address of a local in a parent function. ParentVar is the
2587 /// address of the variable used in the immediate parent function. It can
2588 /// either be an alloca or a call to llvm.localrecover if there are nested
2589 /// outlined functions. ParentFP is the frame pointer of the outermost parent
2591 Address recoverAddrOfEscapedLocal(CodeGenFunction &ParentCGF,
2593 llvm::Value *ParentFP);
2595 void EmitCXXForRangeStmt(const CXXForRangeStmt &S,
2596 ArrayRef<const Attr *> Attrs = None);
2598 /// Returns calculated size of the specified type.
2599 llvm::Value *getTypeSize(QualType Ty);
2600 LValue InitCapturedStruct(const CapturedStmt &S);
2601 llvm::Function *EmitCapturedStmt(const CapturedStmt &S, CapturedRegionKind K);
2602 llvm::Function *GenerateCapturedStmtFunction(const CapturedStmt &S);
2603 Address GenerateCapturedStmtArgument(const CapturedStmt &S);
2604 llvm::Function *GenerateOpenMPCapturedStmtFunction(const CapturedStmt &S);
2605 void GenerateOpenMPCapturedVars(const CapturedStmt &S,
2606 SmallVectorImpl<llvm::Value *> &CapturedVars);
2607 void emitOMPSimpleStore(LValue LVal, RValue RVal, QualType RValTy,
2608 SourceLocation Loc);
2609 /// \brief Perform element by element copying of arrays with type \a
2610 /// OriginalType from \a SrcAddr to \a DestAddr using copying procedure
2611 /// generated by \a CopyGen.
2613 /// \param DestAddr Address of the destination array.
2614 /// \param SrcAddr Address of the source array.
2615 /// \param OriginalType Type of destination and source arrays.
2616 /// \param CopyGen Copying procedure that copies value of single array element
2617 /// to another single array element.
2618 void EmitOMPAggregateAssign(
2619 Address DestAddr, Address SrcAddr, QualType OriginalType,
2620 const llvm::function_ref<void(Address, Address)> &CopyGen);
2621 /// \brief Emit proper copying of data from one variable to another.
2623 /// \param OriginalType Original type of the copied variables.
2624 /// \param DestAddr Destination address.
2625 /// \param SrcAddr Source address.
2626 /// \param DestVD Destination variable used in \a CopyExpr (for arrays, has
2627 /// type of the base array element).
2628 /// \param SrcVD Source variable used in \a CopyExpr (for arrays, has type of
2629 /// the base array element).
2630 /// \param Copy Actual copygin expression for copying data from \a SrcVD to \a
2632 void EmitOMPCopy(QualType OriginalType,
2633 Address DestAddr, Address SrcAddr,
2634 const VarDecl *DestVD, const VarDecl *SrcVD,
2636 /// \brief Emit atomic update code for constructs: \a X = \a X \a BO \a E or
2637 /// \a X = \a E \a BO \a E.
2639 /// \param X Value to be updated.
2640 /// \param E Update value.
2641 /// \param BO Binary operation for update operation.
2642 /// \param IsXLHSInRHSPart true if \a X is LHS in RHS part of the update
2643 /// expression, false otherwise.
2644 /// \param AO Atomic ordering of the generated atomic instructions.
2645 /// \param CommonGen Code generator for complex expressions that cannot be
2646 /// expressed through atomicrmw instruction.
2647 /// \returns <true, OldAtomicValue> if simple 'atomicrmw' instruction was
2648 /// generated, <false, RValue::get(nullptr)> otherwise.
2649 std::pair<bool, RValue> EmitOMPAtomicSimpleUpdateExpr(
2650 LValue X, RValue E, BinaryOperatorKind BO, bool IsXLHSInRHSPart,
2651 llvm::AtomicOrdering AO, SourceLocation Loc,
2652 const llvm::function_ref<RValue(RValue)> &CommonGen);
2653 bool EmitOMPFirstprivateClause(const OMPExecutableDirective &D,
2654 OMPPrivateScope &PrivateScope);
2655 void EmitOMPPrivateClause(const OMPExecutableDirective &D,
2656 OMPPrivateScope &PrivateScope);
2657 void EmitOMPUseDevicePtrClause(
2658 const OMPClause &C, OMPPrivateScope &PrivateScope,
2659 const llvm::DenseMap<const ValueDecl *, Address> &CaptureDeviceAddrMap);
2660 /// \brief Emit code for copyin clause in \a D directive. The next code is
2661 /// generated at the start of outlined functions for directives:
2663 /// threadprivate_var1 = master_threadprivate_var1;
2664 /// operator=(threadprivate_var2, master_threadprivate_var2);
2666 /// __kmpc_barrier(&loc, global_tid);
2669 /// \param D OpenMP directive possibly with 'copyin' clause(s).
2670 /// \returns true if at least one copyin variable is found, false otherwise.
2671 bool EmitOMPCopyinClause(const OMPExecutableDirective &D);
2672 /// \brief Emit initial code for lastprivate variables. If some variable is
2673 /// not also firstprivate, then the default initialization is used. Otherwise
2674 /// initialization of this variable is performed by EmitOMPFirstprivateClause
2677 /// \param D Directive that may have 'lastprivate' directives.
2678 /// \param PrivateScope Private scope for capturing lastprivate variables for
2679 /// proper codegen in internal captured statement.
2681 /// \returns true if there is at least one lastprivate variable, false
2683 bool EmitOMPLastprivateClauseInit(const OMPExecutableDirective &D,
2684 OMPPrivateScope &PrivateScope);
2685 /// \brief Emit final copying of lastprivate values to original variables at
2686 /// the end of the worksharing or simd directive.
2688 /// \param D Directive that has at least one 'lastprivate' directives.
2689 /// \param IsLastIterCond Boolean condition that must be set to 'i1 true' if
2690 /// it is the last iteration of the loop code in associated directive, or to
2691 /// 'i1 false' otherwise. If this item is nullptr, no final check is required.
2692 void EmitOMPLastprivateClauseFinal(const OMPExecutableDirective &D,
2694 llvm::Value *IsLastIterCond = nullptr);
2695 /// Emit initial code for linear clauses.
2696 void EmitOMPLinearClause(const OMPLoopDirective &D,
2697 CodeGenFunction::OMPPrivateScope &PrivateScope);
2698 /// Emit final code for linear clauses.
2699 /// \param CondGen Optional conditional code for final part of codegen for
2701 void EmitOMPLinearClauseFinal(
2702 const OMPLoopDirective &D,
2703 const llvm::function_ref<llvm::Value *(CodeGenFunction &)> &CondGen);
2704 /// \brief Emit initial code for reduction variables. Creates reduction copies
2705 /// and initializes them with the values according to OpenMP standard.
2707 /// \param D Directive (possibly) with the 'reduction' clause.
2708 /// \param PrivateScope Private scope for capturing reduction variables for
2709 /// proper codegen in internal captured statement.
2711 void EmitOMPReductionClauseInit(const OMPExecutableDirective &D,
2712 OMPPrivateScope &PrivateScope);
2713 /// \brief Emit final update of reduction values to original variables at
2714 /// the end of the directive.
2716 /// \param D Directive that has at least one 'reduction' directives.
2717 /// \param ReductionKind The kind of reduction to perform.
2718 void EmitOMPReductionClauseFinal(const OMPExecutableDirective &D,
2719 const OpenMPDirectiveKind ReductionKind);
2720 /// \brief Emit initial code for linear variables. Creates private copies
2721 /// and initializes them with the values according to OpenMP standard.
2723 /// \param D Directive (possibly) with the 'linear' clause.
2724 void EmitOMPLinearClauseInit(const OMPLoopDirective &D);
2726 typedef const llvm::function_ref<void(CodeGenFunction & /*CGF*/,
2727 llvm::Value * /*OutlinedFn*/,
2728 const OMPTaskDataTy & /*Data*/)>
2730 void EmitOMPTaskBasedDirective(const OMPExecutableDirective &S,
2731 const RegionCodeGenTy &BodyGen,
2732 const TaskGenTy &TaskGen, OMPTaskDataTy &Data);
2734 void EmitOMPParallelDirective(const OMPParallelDirective &S);
2735 void EmitOMPSimdDirective(const OMPSimdDirective &S);
2736 void EmitOMPForDirective(const OMPForDirective &S);
2737 void EmitOMPForSimdDirective(const OMPForSimdDirective &S);
2738 void EmitOMPSectionsDirective(const OMPSectionsDirective &S);
2739 void EmitOMPSectionDirective(const OMPSectionDirective &S);
2740 void EmitOMPSingleDirective(const OMPSingleDirective &S);
2741 void EmitOMPMasterDirective(const OMPMasterDirective &S);
2742 void EmitOMPCriticalDirective(const OMPCriticalDirective &S);
2743 void EmitOMPParallelForDirective(const OMPParallelForDirective &S);
2744 void EmitOMPParallelForSimdDirective(const OMPParallelForSimdDirective &S);
2745 void EmitOMPParallelSectionsDirective(const OMPParallelSectionsDirective &S);
2746 void EmitOMPTaskDirective(const OMPTaskDirective &S);
2747 void EmitOMPTaskyieldDirective(const OMPTaskyieldDirective &S);
2748 void EmitOMPBarrierDirective(const OMPBarrierDirective &S);
2749 void EmitOMPTaskwaitDirective(const OMPTaskwaitDirective &S);
2750 void EmitOMPTaskgroupDirective(const OMPTaskgroupDirective &S);
2751 void EmitOMPFlushDirective(const OMPFlushDirective &S);
2752 void EmitOMPOrderedDirective(const OMPOrderedDirective &S);
2753 void EmitOMPAtomicDirective(const OMPAtomicDirective &S);
2754 void EmitOMPTargetDirective(const OMPTargetDirective &S);
2755 void EmitOMPTargetDataDirective(const OMPTargetDataDirective &S);
2756 void EmitOMPTargetEnterDataDirective(const OMPTargetEnterDataDirective &S);
2757 void EmitOMPTargetExitDataDirective(const OMPTargetExitDataDirective &S);
2758 void EmitOMPTargetUpdateDirective(const OMPTargetUpdateDirective &S);
2759 void EmitOMPTargetParallelDirective(const OMPTargetParallelDirective &S);
2761 EmitOMPTargetParallelForDirective(const OMPTargetParallelForDirective &S);
2762 void EmitOMPTeamsDirective(const OMPTeamsDirective &S);
2764 EmitOMPCancellationPointDirective(const OMPCancellationPointDirective &S);
2765 void EmitOMPCancelDirective(const OMPCancelDirective &S);
2766 void EmitOMPTaskLoopBasedDirective(const OMPLoopDirective &S);
2767 void EmitOMPTaskLoopDirective(const OMPTaskLoopDirective &S);
2768 void EmitOMPTaskLoopSimdDirective(const OMPTaskLoopSimdDirective &S);
2769 void EmitOMPDistributeDirective(const OMPDistributeDirective &S);
2770 void EmitOMPDistributeParallelForDirective(
2771 const OMPDistributeParallelForDirective &S);
2772 void EmitOMPDistributeParallelForSimdDirective(
2773 const OMPDistributeParallelForSimdDirective &S);
2774 void EmitOMPDistributeSimdDirective(const OMPDistributeSimdDirective &S);
2775 void EmitOMPTargetParallelForSimdDirective(
2776 const OMPTargetParallelForSimdDirective &S);
2777 void EmitOMPTargetSimdDirective(const OMPTargetSimdDirective &S);
2778 void EmitOMPTeamsDistributeDirective(const OMPTeamsDistributeDirective &S);
2780 EmitOMPTeamsDistributeSimdDirective(const OMPTeamsDistributeSimdDirective &S);
2781 void EmitOMPTeamsDistributeParallelForSimdDirective(
2782 const OMPTeamsDistributeParallelForSimdDirective &S);
2783 void EmitOMPTeamsDistributeParallelForDirective(
2784 const OMPTeamsDistributeParallelForDirective &S);
2785 void EmitOMPTargetTeamsDirective(const OMPTargetTeamsDirective &S);
2786 void EmitOMPTargetTeamsDistributeDirective(
2787 const OMPTargetTeamsDistributeDirective &S);
2788 void EmitOMPTargetTeamsDistributeParallelForDirective(
2789 const OMPTargetTeamsDistributeParallelForDirective &S);
2790 void EmitOMPTargetTeamsDistributeParallelForSimdDirective(
2791 const OMPTargetTeamsDistributeParallelForSimdDirective &S);
2792 void EmitOMPTargetTeamsDistributeSimdDirective(
2793 const OMPTargetTeamsDistributeSimdDirective &S);
2795 /// Emit device code for the target directive.
2796 static void EmitOMPTargetDeviceFunction(CodeGenModule &CGM,
2797 StringRef ParentName,
2798 const OMPTargetDirective &S);
2800 EmitOMPTargetParallelDeviceFunction(CodeGenModule &CGM, StringRef ParentName,
2801 const OMPTargetParallelDirective &S);
2803 EmitOMPTargetTeamsDeviceFunction(CodeGenModule &CGM, StringRef ParentName,
2804 const OMPTargetTeamsDirective &S);
2805 /// \brief Emit inner loop of the worksharing/simd construct.
2807 /// \param S Directive, for which the inner loop must be emitted.
2808 /// \param RequiresCleanup true, if directive has some associated private
2810 /// \param LoopCond Bollean condition for loop continuation.
2811 /// \param IncExpr Increment expression for loop control variable.
2812 /// \param BodyGen Generator for the inner body of the inner loop.
2813 /// \param PostIncGen Genrator for post-increment code (required for ordered
2814 /// loop directvies).
2815 void EmitOMPInnerLoop(
2816 const Stmt &S, bool RequiresCleanup, const Expr *LoopCond,
2817 const Expr *IncExpr,
2818 const llvm::function_ref<void(CodeGenFunction &)> &BodyGen,
2819 const llvm::function_ref<void(CodeGenFunction &)> &PostIncGen);
2821 JumpDest getOMPCancelDestination(OpenMPDirectiveKind Kind);
2822 /// Emit initial code for loop counters of loop-based directives.
2823 void EmitOMPPrivateLoopCounters(const OMPLoopDirective &S,
2824 OMPPrivateScope &LoopScope);
2826 /// Helper for the OpenMP loop directives.
2827 void EmitOMPLoopBody(const OMPLoopDirective &D, JumpDest LoopExit);
2829 /// \brief Emit code for the worksharing loop-based directive.
2830 /// \return true, if this construct has any lastprivate clause, false -
2832 bool EmitOMPWorksharingLoop(const OMPLoopDirective &S, Expr *EUB,
2833 const CodeGenLoopBoundsTy &CodeGenLoopBounds,
2834 const CodeGenDispatchBoundsTy &CGDispatchBounds);
2837 /// Helpers for blocks
2838 llvm::Value *EmitBlockLiteral(const CGBlockInfo &Info);
2840 /// Helpers for the OpenMP loop directives.
2841 void EmitOMPSimdInit(const OMPLoopDirective &D, bool IsMonotonic = false);
2842 void EmitOMPSimdFinal(
2843 const OMPLoopDirective &D,
2844 const llvm::function_ref<llvm::Value *(CodeGenFunction &)> &CondGen);
2846 void EmitOMPDistributeLoop(const OMPLoopDirective &S,
2847 const CodeGenLoopTy &CodeGenLoop, Expr *IncExpr);
2849 /// struct with the values to be passed to the OpenMP loop-related functions
2850 struct OMPLoopArguments {
2851 /// loop lower bound
2852 Address LB = Address::invalid();
2853 /// loop upper bound
2854 Address UB = Address::invalid();
2856 Address ST = Address::invalid();
2857 /// isLastIteration argument for runtime functions
2858 Address IL = Address::invalid();
2859 /// Chunk value generated by sema
2860 llvm::Value *Chunk = nullptr;
2861 /// EnsureUpperBound
2862 Expr *EUB = nullptr;
2863 /// IncrementExpression
2864 Expr *IncExpr = nullptr;
2865 /// Loop initialization
2866 Expr *Init = nullptr;
2867 /// Loop exit condition
2868 Expr *Cond = nullptr;
2869 /// Update of LB after a whole chunk has been executed
2870 Expr *NextLB = nullptr;
2871 /// Update of UB after a whole chunk has been executed
2872 Expr *NextUB = nullptr;
2873 OMPLoopArguments() = default;
2874 OMPLoopArguments(Address LB, Address UB, Address ST, Address IL,
2875 llvm::Value *Chunk = nullptr, Expr *EUB = nullptr,
2876 Expr *IncExpr = nullptr, Expr *Init = nullptr,
2877 Expr *Cond = nullptr, Expr *NextLB = nullptr,
2878 Expr *NextUB = nullptr)
2879 : LB(LB), UB(UB), ST(ST), IL(IL), Chunk(Chunk), EUB(EUB),
2880 IncExpr(IncExpr), Init(Init), Cond(Cond), NextLB(NextLB),
2883 void EmitOMPOuterLoop(bool DynamicOrOrdered, bool IsMonotonic,
2884 const OMPLoopDirective &S, OMPPrivateScope &LoopScope,
2885 const OMPLoopArguments &LoopArgs,
2886 const CodeGenLoopTy &CodeGenLoop,
2887 const CodeGenOrderedTy &CodeGenOrdered);
2888 void EmitOMPForOuterLoop(const OpenMPScheduleTy &ScheduleKind,
2889 bool IsMonotonic, const OMPLoopDirective &S,
2890 OMPPrivateScope &LoopScope, bool Ordered,
2891 const OMPLoopArguments &LoopArgs,
2892 const CodeGenDispatchBoundsTy &CGDispatchBounds);
2893 void EmitOMPDistributeOuterLoop(OpenMPDistScheduleClauseKind ScheduleKind,
2894 const OMPLoopDirective &S,
2895 OMPPrivateScope &LoopScope,
2896 const OMPLoopArguments &LoopArgs,
2897 const CodeGenLoopTy &CodeGenLoopContent);
2898 /// \brief Emit code for sections directive.
2899 void EmitSections(const OMPExecutableDirective &S);
2903 //===--------------------------------------------------------------------===//
2904 // LValue Expression Emission
2905 //===--------------------------------------------------------------------===//
2907 /// GetUndefRValue - Get an appropriate 'undef' rvalue for the given type.
2908 RValue GetUndefRValue(QualType Ty);
2910 /// EmitUnsupportedRValue - Emit a dummy r-value using the type of E
2911 /// and issue an ErrorUnsupported style diagnostic (using the
2913 RValue EmitUnsupportedRValue(const Expr *E,
2916 /// EmitUnsupportedLValue - Emit a dummy l-value using the type of E and issue
2917 /// an ErrorUnsupported style diagnostic (using the provided Name).
2918 LValue EmitUnsupportedLValue(const Expr *E,
2921 /// EmitLValue - Emit code to compute a designator that specifies the location
2922 /// of the expression.
2924 /// This can return one of two things: a simple address or a bitfield
2925 /// reference. In either case, the LLVM Value* in the LValue structure is
2926 /// guaranteed to be an LLVM pointer type.
2928 /// If this returns a bitfield reference, nothing about the pointee type of
2929 /// the LLVM value is known: For example, it may not be a pointer to an
2932 /// If this returns a normal address, and if the lvalue's C type is fixed
2933 /// size, this method guarantees that the returned pointer type will point to
2934 /// an LLVM type of the same size of the lvalue's type. If the lvalue has a
2935 /// variable length type, this is not possible.
2937 LValue EmitLValue(const Expr *E);
2939 /// \brief Same as EmitLValue but additionally we generate checking code to
2940 /// guard against undefined behavior. This is only suitable when we know
2941 /// that the address will be used to access the object.
2942 LValue EmitCheckedLValue(const Expr *E, TypeCheckKind TCK);
2944 RValue convertTempToRValue(Address addr, QualType type,
2945 SourceLocation Loc);
2947 void EmitAtomicInit(Expr *E, LValue lvalue);
2949 bool LValueIsSuitableForInlineAtomic(LValue Src);
2951 RValue EmitAtomicLoad(LValue LV, SourceLocation SL,
2952 AggValueSlot Slot = AggValueSlot::ignored());
2954 RValue EmitAtomicLoad(LValue lvalue, SourceLocation loc,
2955 llvm::AtomicOrdering AO, bool IsVolatile = false,
2956 AggValueSlot slot = AggValueSlot::ignored());
2958 void EmitAtomicStore(RValue rvalue, LValue lvalue, bool isInit);
2960 void EmitAtomicStore(RValue rvalue, LValue lvalue, llvm::AtomicOrdering AO,
2961 bool IsVolatile, bool isInit);
2963 std::pair<RValue, llvm::Value *> EmitAtomicCompareExchange(
2964 LValue Obj, RValue Expected, RValue Desired, SourceLocation Loc,
2965 llvm::AtomicOrdering Success =
2966 llvm::AtomicOrdering::SequentiallyConsistent,
2967 llvm::AtomicOrdering Failure =
2968 llvm::AtomicOrdering::SequentiallyConsistent,
2969 bool IsWeak = false, AggValueSlot Slot = AggValueSlot::ignored());
2971 void EmitAtomicUpdate(LValue LVal, llvm::AtomicOrdering AO,
2972 const llvm::function_ref<RValue(RValue)> &UpdateOp,
2975 /// EmitToMemory - Change a scalar value from its value
2976 /// representation to its in-memory representation.
2977 llvm::Value *EmitToMemory(llvm::Value *Value, QualType Ty);
2979 /// EmitFromMemory - Change a scalar value from its memory
2980 /// representation to its value representation.
2981 llvm::Value *EmitFromMemory(llvm::Value *Value, QualType Ty);
2983 /// Check if the scalar \p Value is within the valid range for the given
2986 /// Returns true if a check is needed (even if the range is unknown).
2987 bool EmitScalarRangeCheck(llvm::Value *Value, QualType Ty,
2988 SourceLocation Loc);
2990 /// EmitLoadOfScalar - Load a scalar value from an address, taking
2991 /// care to appropriately convert from the memory representation to
2992 /// the LLVM value representation.
2993 llvm::Value *EmitLoadOfScalar(Address Addr, bool Volatile, QualType Ty,
2995 AlignmentSource AlignSource =
2996 AlignmentSource::Type,
2997 llvm::MDNode *TBAAInfo = nullptr,
2998 QualType TBAABaseTy = QualType(),
2999 uint64_t TBAAOffset = 0,
3000 bool isNontemporal = false);
3002 /// EmitLoadOfScalar - Load a scalar value from an address, taking
3003 /// care to appropriately convert from the memory representation to
3004 /// the LLVM value representation. The l-value must be a simple
3006 llvm::Value *EmitLoadOfScalar(LValue lvalue, SourceLocation Loc);
3008 /// EmitStoreOfScalar - Store a scalar value to an address, taking
3009 /// care to appropriately convert from the memory representation to
3010 /// the LLVM value representation.
3011 void EmitStoreOfScalar(llvm::Value *Value, Address Addr,
3012 bool Volatile, QualType Ty,
3013 AlignmentSource AlignSource = AlignmentSource::Type,
3014 llvm::MDNode *TBAAInfo = nullptr, bool isInit = false,
3015 QualType TBAABaseTy = QualType(),
3016 uint64_t TBAAOffset = 0, bool isNontemporal = false);
3018 /// EmitStoreOfScalar - Store a scalar value to an address, taking
3019 /// care to appropriately convert from the memory representation to
3020 /// the LLVM value representation. The l-value must be a simple
3021 /// l-value. The isInit flag indicates whether this is an initialization.
3022 /// If so, atomic qualifiers are ignored and the store is always non-atomic.
3023 void EmitStoreOfScalar(llvm::Value *value, LValue lvalue, bool isInit=false);
3025 /// EmitLoadOfLValue - Given an expression that represents a value lvalue,
3026 /// this method emits the address of the lvalue, then loads the result as an
3027 /// rvalue, returning the rvalue.
3028 RValue EmitLoadOfLValue(LValue V, SourceLocation Loc);
3029 RValue EmitLoadOfExtVectorElementLValue(LValue V);
3030 RValue EmitLoadOfBitfieldLValue(LValue LV, SourceLocation Loc);
3031 RValue EmitLoadOfGlobalRegLValue(LValue LV);
3033 /// EmitStoreThroughLValue - Store the specified rvalue into the specified
3034 /// lvalue, where both are guaranteed to the have the same type, and that type
3036 void EmitStoreThroughLValue(RValue Src, LValue Dst, bool isInit = false);
3037 void EmitStoreThroughExtVectorComponentLValue(RValue Src, LValue Dst);
3038 void EmitStoreThroughGlobalRegLValue(RValue Src, LValue Dst);
3040 /// EmitStoreThroughBitfieldLValue - Store Src into Dst with same constraints
3041 /// as EmitStoreThroughLValue.
3043 /// \param Result [out] - If non-null, this will be set to a Value* for the
3044 /// bit-field contents after the store, appropriate for use as the result of
3045 /// an assignment to the bit-field.
3046 void EmitStoreThroughBitfieldLValue(RValue Src, LValue Dst,
3047 llvm::Value **Result=nullptr);
3049 /// Emit an l-value for an assignment (simple or compound) of complex type.
3050 LValue EmitComplexAssignmentLValue(const BinaryOperator *E);
3051 LValue EmitComplexCompoundAssignmentLValue(const CompoundAssignOperator *E);
3052 LValue EmitScalarCompoundAssignWithComplex(const CompoundAssignOperator *E,
3053 llvm::Value *&Result);
3055 // Note: only available for agg return types
3056 LValue EmitBinaryOperatorLValue(const BinaryOperator *E);
3057 LValue EmitCompoundAssignmentLValue(const CompoundAssignOperator *E);
3058 // Note: only available for agg return types
3059 LValue EmitCallExprLValue(const CallExpr *E);
3060 // Note: only available for agg return types
3061 LValue EmitVAArgExprLValue(const VAArgExpr *E);
3062 LValue EmitDeclRefLValue(const DeclRefExpr *E);
3063 LValue EmitStringLiteralLValue(const StringLiteral *E);
3064 LValue EmitObjCEncodeExprLValue(const ObjCEncodeExpr *E);
3065 LValue EmitPredefinedLValue(const PredefinedExpr *E);
3066 LValue EmitUnaryOpLValue(const UnaryOperator *E);
3067 LValue EmitArraySubscriptExpr(const ArraySubscriptExpr *E,
3068 bool Accessed = false);
3069 LValue EmitOMPArraySectionExpr(const OMPArraySectionExpr *E,
3070 bool IsLowerBound = true);
3071 LValue EmitExtVectorElementExpr(const ExtVectorElementExpr *E);
3072 LValue EmitMemberExpr(const MemberExpr *E);
3073 LValue EmitObjCIsaExpr(const ObjCIsaExpr *E);
3074 LValue EmitCompoundLiteralLValue(const CompoundLiteralExpr *E);
3075 LValue EmitInitListLValue(const InitListExpr *E);
3076 LValue EmitConditionalOperatorLValue(const AbstractConditionalOperator *E);
3077 LValue EmitCastLValue(const CastExpr *E);
3078 LValue EmitMaterializeTemporaryExpr(const MaterializeTemporaryExpr *E);
3079 LValue EmitOpaqueValueLValue(const OpaqueValueExpr *e);
3081 Address EmitExtVectorElementLValue(LValue V);
3083 RValue EmitRValueForField(LValue LV, const FieldDecl *FD, SourceLocation Loc);
3085 Address EmitArrayToPointerDecay(const Expr *Array,
3086 AlignmentSource *AlignSource = nullptr);
3088 class ConstantEmission {
3089 llvm::PointerIntPair<llvm::Constant*, 1, bool> ValueAndIsReference;
3090 ConstantEmission(llvm::Constant *C, bool isReference)
3091 : ValueAndIsReference(C, isReference) {}
3093 ConstantEmission() {}
3094 static ConstantEmission forReference(llvm::Constant *C) {
3095 return ConstantEmission(C, true);
3097 static ConstantEmission forValue(llvm::Constant *C) {
3098 return ConstantEmission(C, false);
3101 explicit operator bool() const {
3102 return ValueAndIsReference.getOpaqueValue() != nullptr;
3105 bool isReference() const { return ValueAndIsReference.getInt(); }
3106 LValue getReferenceLValue(CodeGenFunction &CGF, Expr *refExpr) const {
3107 assert(isReference());
3108 return CGF.MakeNaturalAlignAddrLValue(ValueAndIsReference.getPointer(),
3109 refExpr->getType());
3112 llvm::Constant *getValue() const {
3113 assert(!isReference());
3114 return ValueAndIsReference.getPointer();
3118 ConstantEmission tryEmitAsConstant(DeclRefExpr *refExpr);
3120 RValue EmitPseudoObjectRValue(const PseudoObjectExpr *e,
3121 AggValueSlot slot = AggValueSlot::ignored());
3122 LValue EmitPseudoObjectLValue(const PseudoObjectExpr *e);
3124 llvm::Value *EmitIvarOffset(const ObjCInterfaceDecl *Interface,
3125 const ObjCIvarDecl *Ivar);
3126 LValue EmitLValueForField(LValue Base, const FieldDecl* Field);
3127 LValue EmitLValueForLambdaField(const FieldDecl *Field);
3129 /// EmitLValueForFieldInitialization - Like EmitLValueForField, except that
3130 /// if the Field is a reference, this will return the address of the reference
3131 /// and not the address of the value stored in the reference.
3132 LValue EmitLValueForFieldInitialization(LValue Base,
3133 const FieldDecl* Field);
3135 LValue EmitLValueForIvar(QualType ObjectTy,
3136 llvm::Value* Base, const ObjCIvarDecl *Ivar,
3137 unsigned CVRQualifiers);
3139 LValue EmitCXXConstructLValue(const CXXConstructExpr *E);
3140 LValue EmitCXXBindTemporaryLValue(const CXXBindTemporaryExpr *E);
3141 LValue EmitLambdaLValue(const LambdaExpr *E);
3142 LValue EmitCXXTypeidLValue(const CXXTypeidExpr *E);
3143 LValue EmitCXXUuidofLValue(const CXXUuidofExpr *E);
3145 LValue EmitObjCMessageExprLValue(const ObjCMessageExpr *E);
3146 LValue EmitObjCIvarRefLValue(const ObjCIvarRefExpr *E);
3147 LValue EmitStmtExprLValue(const StmtExpr *E);
3148 LValue EmitPointerToDataMemberBinaryExpr(const BinaryOperator *E);
3149 LValue EmitObjCSelectorLValue(const ObjCSelectorExpr *E);
3150 void EmitDeclRefExprDbgValue(const DeclRefExpr *E, const APValue &Init);
3152 //===--------------------------------------------------------------------===//
3153 // Scalar Expression Emission
3154 //===--------------------------------------------------------------------===//
3156 /// EmitCall - Generate a call of the given function, expecting the given
3157 /// result type, and using the given argument list which specifies both the
3158 /// LLVM arguments and the types they were derived from.
3159 RValue EmitCall(const CGFunctionInfo &CallInfo, const CGCallee &Callee,
3160 ReturnValueSlot ReturnValue, const CallArgList &Args,
3161 llvm::Instruction **callOrInvoke = nullptr);
3163 RValue EmitCall(QualType FnType, const CGCallee &Callee, const CallExpr *E,
3164 ReturnValueSlot ReturnValue,
3165 llvm::Value *Chain = nullptr);
3166 RValue EmitCallExpr(const CallExpr *E,
3167 ReturnValueSlot ReturnValue = ReturnValueSlot());
3168 RValue EmitSimpleCallExpr(const CallExpr *E, ReturnValueSlot ReturnValue);
3169 CGCallee EmitCallee(const Expr *E);
3171 void checkTargetFeatures(const CallExpr *E, const FunctionDecl *TargetDecl);
3173 llvm::CallInst *EmitRuntimeCall(llvm::Value *callee,
3174 const Twine &name = "");
3175 llvm::CallInst *EmitRuntimeCall(llvm::Value *callee,
3176 ArrayRef<llvm::Value*> args,
3177 const Twine &name = "");
3178 llvm::CallInst *EmitNounwindRuntimeCall(llvm::Value *callee,
3179 const Twine &name = "");
3180 llvm::CallInst *EmitNounwindRuntimeCall(llvm::Value *callee,
3181 ArrayRef<llvm::Value*> args,
3182 const Twine &name = "");
3184 llvm::CallSite EmitCallOrInvoke(llvm::Value *Callee,
3185 ArrayRef<llvm::Value *> Args,
3186 const Twine &Name = "");
3187 llvm::CallSite EmitRuntimeCallOrInvoke(llvm::Value *callee,
3188 ArrayRef<llvm::Value*> args,
3189 const Twine &name = "");
3190 llvm::CallSite EmitRuntimeCallOrInvoke(llvm::Value *callee,
3191 const Twine &name = "");
3192 void EmitNoreturnRuntimeCallOrInvoke(llvm::Value *callee,
3193 ArrayRef<llvm::Value*> args);
3195 CGCallee BuildAppleKextVirtualCall(const CXXMethodDecl *MD,
3196 NestedNameSpecifier *Qual,
3199 CGCallee BuildAppleKextVirtualDestructorCall(const CXXDestructorDecl *DD,
3201 const CXXRecordDecl *RD);
3204 EmitCXXMemberOrOperatorCall(const CXXMethodDecl *Method,
3205 const CGCallee &Callee,
3206 ReturnValueSlot ReturnValue, llvm::Value *This,
3207 llvm::Value *ImplicitParam,
3208 QualType ImplicitParamTy, const CallExpr *E,
3209 CallArgList *RtlArgs);
3210 RValue EmitCXXDestructorCall(const CXXDestructorDecl *DD,
3211 const CGCallee &Callee,
3212 llvm::Value *This, llvm::Value *ImplicitParam,
3213 QualType ImplicitParamTy, const CallExpr *E,
3215 RValue EmitCXXMemberCallExpr(const CXXMemberCallExpr *E,
3216 ReturnValueSlot ReturnValue);
3217 RValue EmitCXXMemberOrOperatorMemberCallExpr(const CallExpr *CE,
3218 const CXXMethodDecl *MD,
3219 ReturnValueSlot ReturnValue,
3221 NestedNameSpecifier *Qualifier,
3222 bool IsArrow, const Expr *Base);
3223 // Compute the object pointer.
3224 Address EmitCXXMemberDataPointerAddress(const Expr *E, Address base,
3225 llvm::Value *memberPtr,
3226 const MemberPointerType *memberPtrType,
3227 AlignmentSource *AlignSource = nullptr);
3228 RValue EmitCXXMemberPointerCallExpr(const CXXMemberCallExpr *E,
3229 ReturnValueSlot ReturnValue);
3231 RValue EmitCXXOperatorMemberCallExpr(const CXXOperatorCallExpr *E,
3232 const CXXMethodDecl *MD,
3233 ReturnValueSlot ReturnValue);
3234 RValue EmitCXXPseudoDestructorExpr(const CXXPseudoDestructorExpr *E);
3236 RValue EmitCUDAKernelCallExpr(const CUDAKernelCallExpr *E,
3237 ReturnValueSlot ReturnValue);
3239 RValue EmitNVPTXDevicePrintfCallExpr(const CallExpr *E,
3240 ReturnValueSlot ReturnValue);
3242 RValue EmitBuiltinExpr(const FunctionDecl *FD,
3243 unsigned BuiltinID, const CallExpr *E,
3244 ReturnValueSlot ReturnValue);
3246 RValue EmitBlockCallExpr(const CallExpr *E, ReturnValueSlot ReturnValue);
3248 /// EmitTargetBuiltinExpr - Emit the given builtin call. Returns 0 if the call
3249 /// is unhandled by the current target.
3250 llvm::Value *EmitTargetBuiltinExpr(unsigned BuiltinID, const CallExpr *E);
3252 llvm::Value *EmitAArch64CompareBuiltinExpr(llvm::Value *Op, llvm::Type *Ty,
3253 const llvm::CmpInst::Predicate Fp,
3254 const llvm::CmpInst::Predicate Ip,
3255 const llvm::Twine &Name = "");
3256 llvm::Value *EmitARMBuiltinExpr(unsigned BuiltinID, const CallExpr *E);
3258 llvm::Value *EmitCommonNeonBuiltinExpr(unsigned BuiltinID,
3259 unsigned LLVMIntrinsic,
3260 unsigned AltLLVMIntrinsic,
3261 const char *NameHint,
3264 SmallVectorImpl<llvm::Value *> &Ops,
3265 Address PtrOp0, Address PtrOp1);
3266 llvm::Function *LookupNeonLLVMIntrinsic(unsigned IntrinsicID,
3267 unsigned Modifier, llvm::Type *ArgTy,
3269 llvm::Value *EmitNeonCall(llvm::Function *F,
3270 SmallVectorImpl<llvm::Value*> &O,
3272 unsigned shift = 0, bool rightshift = false);
3273 llvm::Value *EmitNeonSplat(llvm::Value *V, llvm::Constant *Idx);
3274 llvm::Value *EmitNeonShiftVector(llvm::Value *V, llvm::Type *Ty,
3275 bool negateForRightShift);
3276 llvm::Value *EmitNeonRShiftImm(llvm::Value *Vec, llvm::Value *Amt,
3277 llvm::Type *Ty, bool usgn, const char *name);
3278 llvm::Value *vectorWrapScalar16(llvm::Value *Op);
3279 llvm::Value *EmitAArch64BuiltinExpr(unsigned BuiltinID, const CallExpr *E);
3281 llvm::Value *BuildVector(ArrayRef<llvm::Value*> Ops);
3282 llvm::Value *EmitX86BuiltinExpr(unsigned BuiltinID, const CallExpr *E);
3283 llvm::Value *EmitPPCBuiltinExpr(unsigned BuiltinID, const CallExpr *E);
3284 llvm::Value *EmitAMDGPUBuiltinExpr(unsigned BuiltinID, const CallExpr *E);
3285 llvm::Value *EmitSystemZBuiltinExpr(unsigned BuiltinID, const CallExpr *E);
3286 llvm::Value *EmitNVPTXBuiltinExpr(unsigned BuiltinID, const CallExpr *E);
3287 llvm::Value *EmitWebAssemblyBuiltinExpr(unsigned BuiltinID,
3291 enum class MSVCIntrin;
3294 llvm::Value *EmitMSVCBuiltinExpr(MSVCIntrin BuiltinID, const CallExpr *E);
3296 llvm::Value *EmitBuiltinAvailable(ArrayRef<llvm::Value *> Args);
3298 llvm::Value *EmitObjCProtocolExpr(const ObjCProtocolExpr *E);
3299 llvm::Value *EmitObjCStringLiteral(const ObjCStringLiteral *E);
3300 llvm::Value *EmitObjCBoxedExpr(const ObjCBoxedExpr *E);
3301 llvm::Value *EmitObjCArrayLiteral(const ObjCArrayLiteral *E);
3302 llvm::Value *EmitObjCDictionaryLiteral(const ObjCDictionaryLiteral *E);
3303 llvm::Value *EmitObjCCollectionLiteral(const Expr *E,
3304 const ObjCMethodDecl *MethodWithObjects);
3305 llvm::Value *EmitObjCSelectorExpr(const ObjCSelectorExpr *E);
3306 RValue EmitObjCMessageExpr(const ObjCMessageExpr *E,
3307 ReturnValueSlot Return = ReturnValueSlot());
3309 /// Retrieves the default cleanup kind for an ARC cleanup.
3310 /// Except under -fobjc-arc-eh, ARC cleanups are normal-only.
3311 CleanupKind getARCCleanupKind() {
3312 return CGM.getCodeGenOpts().ObjCAutoRefCountExceptions
3313 ? NormalAndEHCleanup : NormalCleanup;
3317 void EmitARCInitWeak(Address addr, llvm::Value *value);
3318 void EmitARCDestroyWeak(Address addr);
3319 llvm::Value *EmitARCLoadWeak(Address addr);
3320 llvm::Value *EmitARCLoadWeakRetained(Address addr);
3321 llvm::Value *EmitARCStoreWeak(Address addr, llvm::Value *value, bool ignored);
3322 void EmitARCCopyWeak(Address dst, Address src);
3323 void EmitARCMoveWeak(Address dst, Address src);
3324 llvm::Value *EmitARCRetainAutorelease(QualType type, llvm::Value *value);
3325 llvm::Value *EmitARCRetainAutoreleaseNonBlock(llvm::Value *value);
3326 llvm::Value *EmitARCStoreStrong(LValue lvalue, llvm::Value *value,
3327 bool resultIgnored);
3328 llvm::Value *EmitARCStoreStrongCall(Address addr, llvm::Value *value,
3329 bool resultIgnored);
3330 llvm::Value *EmitARCRetain(QualType type, llvm::Value *value);
3331 llvm::Value *EmitARCRetainNonBlock(llvm::Value *value);
3332 llvm::Value *EmitARCRetainBlock(llvm::Value *value, bool mandatory);
3333 void EmitARCDestroyStrong(Address addr, ARCPreciseLifetime_t precise);
3334 void EmitARCRelease(llvm::Value *value, ARCPreciseLifetime_t precise);
3335 llvm::Value *EmitARCAutorelease(llvm::Value *value);
3336 llvm::Value *EmitARCAutoreleaseReturnValue(llvm::Value *value);
3337 llvm::Value *EmitARCRetainAutoreleaseReturnValue(llvm::Value *value);
3338 llvm::Value *EmitARCRetainAutoreleasedReturnValue(llvm::Value *value);
3339 llvm::Value *EmitARCUnsafeClaimAutoreleasedReturnValue(llvm::Value *value);
3341 std::pair<LValue,llvm::Value*>
3342 EmitARCStoreAutoreleasing(const BinaryOperator *e);
3343 std::pair<LValue,llvm::Value*>
3344 EmitARCStoreStrong(const BinaryOperator *e, bool ignored);
3345 std::pair<LValue,llvm::Value*>
3346 EmitARCStoreUnsafeUnretained(const BinaryOperator *e, bool ignored);
3348 llvm::Value *EmitObjCThrowOperand(const Expr *expr);
3349 llvm::Value *EmitObjCConsumeObject(QualType T, llvm::Value *Ptr);
3350 llvm::Value *EmitObjCExtendObjectLifetime(QualType T, llvm::Value *Ptr);
3352 llvm::Value *EmitARCExtendBlockObject(const Expr *expr);
3353 llvm::Value *EmitARCReclaimReturnedObject(const Expr *e,
3354 bool allowUnsafeClaim);
3355 llvm::Value *EmitARCRetainScalarExpr(const Expr *expr);
3356 llvm::Value *EmitARCRetainAutoreleaseScalarExpr(const Expr *expr);
3357 llvm::Value *EmitARCUnsafeUnretainedScalarExpr(const Expr *expr);
3359 void EmitARCIntrinsicUse(ArrayRef<llvm::Value*> values);
3361 static Destroyer destroyARCStrongImprecise;
3362 static Destroyer destroyARCStrongPrecise;
3363 static Destroyer destroyARCWeak;
3364 static Destroyer emitARCIntrinsicUse;
3366 void EmitObjCAutoreleasePoolPop(llvm::Value *Ptr);
3367 llvm::Value *EmitObjCAutoreleasePoolPush();
3368 llvm::Value *EmitObjCMRRAutoreleasePoolPush();
3369 void EmitObjCAutoreleasePoolCleanup(llvm::Value *Ptr);
3370 void EmitObjCMRRAutoreleasePoolPop(llvm::Value *Ptr);
3372 /// \brief Emits a reference binding to the passed in expression.
3373 RValue EmitReferenceBindingToExpr(const Expr *E);
3375 //===--------------------------------------------------------------------===//
3376 // Expression Emission
3377 //===--------------------------------------------------------------------===//
3379 // Expressions are broken into three classes: scalar, complex, aggregate.
3381 /// EmitScalarExpr - Emit the computation of the specified expression of LLVM
3382 /// scalar type, returning the result.
3383 llvm::Value *EmitScalarExpr(const Expr *E , bool IgnoreResultAssign = false);
3385 /// Emit a conversion from the specified type to the specified destination
3386 /// type, both of which are LLVM scalar types.
3387 llvm::Value *EmitScalarConversion(llvm::Value *Src, QualType SrcTy,
3388 QualType DstTy, SourceLocation Loc);
3390 /// Emit a conversion from the specified complex type to the specified
3391 /// destination type, where the destination type is an LLVM scalar type.
3392 llvm::Value *EmitComplexToScalarConversion(ComplexPairTy Src, QualType SrcTy,
3394 SourceLocation Loc);
3396 /// EmitAggExpr - Emit the computation of the specified expression
3397 /// of aggregate type. The result is computed into the given slot,
3398 /// which may be null to indicate that the value is not needed.
3399 void EmitAggExpr(const Expr *E, AggValueSlot AS);
3401 /// EmitAggExprToLValue - Emit the computation of the specified expression of
3402 /// aggregate type into a temporary LValue.
3403 LValue EmitAggExprToLValue(const Expr *E);
3405 /// EmitExtendGCLifetime - Given a pointer to an Objective-C object,
3406 /// make sure it survives garbage collection until this point.
3407 void EmitExtendGCLifetime(llvm::Value *object);
3409 /// EmitComplexExpr - Emit the computation of the specified expression of
3410 /// complex type, returning the result.
3411 ComplexPairTy EmitComplexExpr(const Expr *E,
3412 bool IgnoreReal = false,
3413 bool IgnoreImag = false);
3415 /// EmitComplexExprIntoLValue - Emit the given expression of complex
3416 /// type and place its result into the specified l-value.
3417 void EmitComplexExprIntoLValue(const Expr *E, LValue dest, bool isInit);
3419 /// EmitStoreOfComplex - Store a complex number into the specified l-value.
3420 void EmitStoreOfComplex(ComplexPairTy V, LValue dest, bool isInit);
3422 /// EmitLoadOfComplex - Load a complex number from the specified l-value.
3423 ComplexPairTy EmitLoadOfComplex(LValue src, SourceLocation loc);
3425 Address emitAddrOfRealComponent(Address complex, QualType complexType);
3426 Address emitAddrOfImagComponent(Address complex, QualType complexType);
3428 /// AddInitializerToStaticVarDecl - Add the initializer for 'D' to the
3429 /// global variable that has already been created for it. If the initializer
3430 /// has a different type than GV does, this may free GV and return a different
3431 /// one. Otherwise it just returns GV.
3432 llvm::GlobalVariable *
3433 AddInitializerToStaticVarDecl(const VarDecl &D,
3434 llvm::GlobalVariable *GV);
3437 /// EmitCXXGlobalVarDeclInit - Create the initializer for a C++
3438 /// variable with global storage.
3439 void EmitCXXGlobalVarDeclInit(const VarDecl &D, llvm::Constant *DeclPtr,
3442 llvm::Constant *createAtExitStub(const VarDecl &VD, llvm::Constant *Dtor,
3443 llvm::Constant *Addr);
3445 /// Call atexit() with a function that passes the given argument to
3446 /// the given function.
3447 void registerGlobalDtorWithAtExit(const VarDecl &D, llvm::Constant *fn,
3448 llvm::Constant *addr);
3450 /// Emit code in this function to perform a guarded variable
3451 /// initialization. Guarded initializations are used when it's not
3452 /// possible to prove that an initialization will be done exactly
3453 /// once, e.g. with a static local variable or a static data member
3454 /// of a class template.
3455 void EmitCXXGuardedInit(const VarDecl &D, llvm::GlobalVariable *DeclPtr,
3458 /// GenerateCXXGlobalInitFunc - Generates code for initializing global
3460 void GenerateCXXGlobalInitFunc(llvm::Function *Fn,
3461 ArrayRef<llvm::Function *> CXXThreadLocals,
3462 Address Guard = Address::invalid());
3464 /// GenerateCXXGlobalDtorsFunc - Generates code for destroying global
3466 void GenerateCXXGlobalDtorsFunc(
3468 const std::vector<std::pair<llvm::WeakTrackingVH, llvm::Constant *>>
3471 void GenerateCXXGlobalVarDeclInitFunc(llvm::Function *Fn,
3473 llvm::GlobalVariable *Addr,
3476 void EmitCXXConstructExpr(const CXXConstructExpr *E, AggValueSlot Dest);
3478 void EmitSynthesizedCXXCopyCtor(Address Dest, Address Src, const Expr *Exp);
3480 void enterFullExpression(const ExprWithCleanups *E) {
3481 if (E->getNumObjects() == 0) return;
3482 enterNonTrivialFullExpression(E);
3484 void enterNonTrivialFullExpression(const ExprWithCleanups *E);
3486 void EmitCXXThrowExpr(const CXXThrowExpr *E, bool KeepInsertionPoint = true);
3488 void EmitLambdaExpr(const LambdaExpr *E, AggValueSlot Dest);
3490 RValue EmitAtomicExpr(AtomicExpr *E);
3492 //===--------------------------------------------------------------------===//
3493 // Annotations Emission
3494 //===--------------------------------------------------------------------===//
3496 /// Emit an annotation call (intrinsic or builtin).
3497 llvm::Value *EmitAnnotationCall(llvm::Value *AnnotationFn,
3498 llvm::Value *AnnotatedVal,
3499 StringRef AnnotationStr,
3500 SourceLocation Location);
3502 /// Emit local annotations for the local variable V, declared by D.
3503 void EmitVarAnnotations(const VarDecl *D, llvm::Value *V);
3505 /// Emit field annotations for the given field & value. Returns the
3506 /// annotation result.
3507 Address EmitFieldAnnotations(const FieldDecl *D, Address V);
3509 //===--------------------------------------------------------------------===//
3511 //===--------------------------------------------------------------------===//
3513 /// ContainsLabel - Return true if the statement contains a label in it. If
3514 /// this statement is not executed normally, it not containing a label means
3515 /// that we can just remove the code.
3516 static bool ContainsLabel(const Stmt *S, bool IgnoreCaseStmts = false);
3518 /// containsBreak - Return true if the statement contains a break out of it.
3519 /// If the statement (recursively) contains a switch or loop with a break
3520 /// inside of it, this is fine.
3521 static bool containsBreak(const Stmt *S);
3523 /// Determine if the given statement might introduce a declaration into the
3524 /// current scope, by being a (possibly-labelled) DeclStmt.
3525 static bool mightAddDeclToScope(const Stmt *S);
3527 /// ConstantFoldsToSimpleInteger - If the specified expression does not fold
3528 /// to a constant, or if it does but contains a label, return false. If it
3529 /// constant folds return true and set the boolean result in Result.
3530 bool ConstantFoldsToSimpleInteger(const Expr *Cond, bool &Result,
3531 bool AllowLabels = false);
3533 /// ConstantFoldsToSimpleInteger - If the specified expression does not fold
3534 /// to a constant, or if it does but contains a label, return false. If it
3535 /// constant folds return true and set the folded value.
3536 bool ConstantFoldsToSimpleInteger(const Expr *Cond, llvm::APSInt &Result,
3537 bool AllowLabels = false);
3539 /// EmitBranchOnBoolExpr - Emit a branch on a boolean condition (e.g. for an
3540 /// if statement) to the specified blocks. Based on the condition, this might
3541 /// try to simplify the codegen of the conditional based on the branch.
3542 /// TrueCount should be the number of times we expect the condition to
3543 /// evaluate to true based on PGO data.
3544 void EmitBranchOnBoolExpr(const Expr *Cond, llvm::BasicBlock *TrueBlock,
3545 llvm::BasicBlock *FalseBlock, uint64_t TrueCount);
3547 /// Given an assignment `*LHS = RHS`, emit a test that checks if \p RHS is
3548 /// nonnull, if \p LHS is marked _Nonnull.
3549 void EmitNullabilityCheck(LValue LHS, llvm::Value *RHS, SourceLocation Loc);
3551 /// \brief Emit a description of a type in a format suitable for passing to
3552 /// a runtime sanitizer handler.
3553 llvm::Constant *EmitCheckTypeDescriptor(QualType T);
3555 /// \brief Convert a value into a format suitable for passing to a runtime
3556 /// sanitizer handler.
3557 llvm::Value *EmitCheckValue(llvm::Value *V);
3559 /// \brief Emit a description of a source location in a format suitable for
3560 /// passing to a runtime sanitizer handler.
3561 llvm::Constant *EmitCheckSourceLocation(SourceLocation Loc);
3563 /// \brief Create a basic block that will call a handler function in a
3564 /// sanitizer runtime with the provided arguments, and create a conditional
3566 void EmitCheck(ArrayRef<std::pair<llvm::Value *, SanitizerMask>> Checked,
3567 SanitizerHandler Check, ArrayRef<llvm::Constant *> StaticArgs,
3568 ArrayRef<llvm::Value *> DynamicArgs);
3570 /// \brief Emit a slow path cross-DSO CFI check which calls __cfi_slowpath
3571 /// if Cond if false.
3572 void EmitCfiSlowPathCheck(SanitizerMask Kind, llvm::Value *Cond,
3573 llvm::ConstantInt *TypeId, llvm::Value *Ptr,
3574 ArrayRef<llvm::Constant *> StaticArgs);
3576 /// \brief Create a basic block that will call the trap intrinsic, and emit a
3577 /// conditional branch to it, for the -ftrapv checks.
3578 void EmitTrapCheck(llvm::Value *Checked);
3580 /// \brief Emit a call to trap or debugtrap and attach function attribute
3581 /// "trap-func-name" if specified.
3582 llvm::CallInst *EmitTrapCall(llvm::Intrinsic::ID IntrID);
3584 /// \brief Emit a stub for the cross-DSO CFI check function.
3585 void EmitCfiCheckStub();
3587 /// \brief Emit a cross-DSO CFI failure handling function.
3588 void EmitCfiCheckFail();
3590 /// \brief Create a check for a function parameter that may potentially be
3591 /// declared as non-null.
3592 void EmitNonNullArgCheck(RValue RV, QualType ArgType, SourceLocation ArgLoc,
3593 AbstractCallee AC, unsigned ParmNum);
3595 /// EmitCallArg - Emit a single call argument.
3596 void EmitCallArg(CallArgList &args, const Expr *E, QualType ArgType);
3598 /// EmitDelegateCallArg - We are performing a delegate call; that
3599 /// is, the current function is delegating to another one. Produce
3600 /// a r-value suitable for passing the given parameter.
3601 void EmitDelegateCallArg(CallArgList &args, const VarDecl *param,
3602 SourceLocation loc);
3604 /// SetFPAccuracy - Set the minimum required accuracy of the given floating
3605 /// point operation, expressed as the maximum relative error in ulp.
3606 void SetFPAccuracy(llvm::Value *Val, float Accuracy);
3609 llvm::MDNode *getRangeForLoadFromType(QualType Ty);
3610 void EmitReturnOfRValue(RValue RV, QualType Ty);
3612 void deferPlaceholderReplacement(llvm::Instruction *Old, llvm::Value *New);
3614 llvm::SmallVector<std::pair<llvm::Instruction *, llvm::Value *>, 4>
3615 DeferredReplacements;
3617 /// Set the address of a local variable.
3618 void setAddrOfLocalVar(const VarDecl *VD, Address Addr) {
3619 assert(!LocalDeclMap.count(VD) && "Decl already exists in LocalDeclMap!");
3620 LocalDeclMap.insert({VD, Addr});
3623 /// ExpandTypeFromArgs - Reconstruct a structure of type \arg Ty
3624 /// from function arguments into \arg Dst. See ABIArgInfo::Expand.
3626 /// \param AI - The first function argument of the expansion.
3627 void ExpandTypeFromArgs(QualType Ty, LValue Dst,
3628 SmallVectorImpl<llvm::Value *>::iterator &AI);
3630 /// ExpandTypeToArgs - Expand an RValue \arg RV, with the LLVM type for \arg
3631 /// Ty, into individual arguments on the provided vector \arg IRCallArgs,
3632 /// starting at index \arg IRCallArgPos. See ABIArgInfo::Expand.
3633 void ExpandTypeToArgs(QualType Ty, RValue RV, llvm::FunctionType *IRFuncTy,
3634 SmallVectorImpl<llvm::Value *> &IRCallArgs,
3635 unsigned &IRCallArgPos);
3637 llvm::Value* EmitAsmInput(const TargetInfo::ConstraintInfo &Info,
3638 const Expr *InputExpr, std::string &ConstraintStr);
3640 llvm::Value* EmitAsmInputLValue(const TargetInfo::ConstraintInfo &Info,
3641 LValue InputValue, QualType InputType,
3642 std::string &ConstraintStr,
3643 SourceLocation Loc);
3645 /// \brief Attempts to statically evaluate the object size of E. If that
3646 /// fails, emits code to figure the size of E out for us. This is
3647 /// pass_object_size aware.
3649 /// If EmittedExpr is non-null, this will use that instead of re-emitting E.
3650 llvm::Value *evaluateOrEmitBuiltinObjectSize(const Expr *E, unsigned Type,
3651 llvm::IntegerType *ResType,
3652 llvm::Value *EmittedE);
3654 /// \brief Emits the size of E, as required by __builtin_object_size. This
3655 /// function is aware of pass_object_size parameters, and will act accordingly
3656 /// if E is a parameter with the pass_object_size attribute.
3657 llvm::Value *emitBuiltinObjectSize(const Expr *E, unsigned Type,
3658 llvm::IntegerType *ResType,
3659 llvm::Value *EmittedE);
3663 // Determine whether the given argument is an Objective-C method
3664 // that may have type parameters in its signature.
3665 static bool isObjCMethodWithTypeParams(const ObjCMethodDecl *method) {
3666 const DeclContext *dc = method->getDeclContext();
3667 if (const ObjCInterfaceDecl *classDecl= dyn_cast<ObjCInterfaceDecl>(dc)) {
3668 return classDecl->getTypeParamListAsWritten();
3671 if (const ObjCCategoryDecl *catDecl = dyn_cast<ObjCCategoryDecl>(dc)) {
3672 return catDecl->getTypeParamList();
3678 template<typename T>
3679 static bool isObjCMethodWithTypeParams(const T *) { return false; }
3682 enum class EvaluationOrder {
3683 ///! No language constraints on evaluation order.
3685 ///! Language semantics require left-to-right evaluation.
3687 ///! Language semantics require right-to-left evaluation.
3691 /// EmitCallArgs - Emit call arguments for a function.
3692 template <typename T>
3693 void EmitCallArgs(CallArgList &Args, const T *CallArgTypeInfo,
3694 llvm::iterator_range<CallExpr::const_arg_iterator> ArgRange,
3695 AbstractCallee AC = AbstractCallee(),
3696 unsigned ParamsToSkip = 0,
3697 EvaluationOrder Order = EvaluationOrder::Default) {
3698 SmallVector<QualType, 16> ArgTypes;
3699 CallExpr::const_arg_iterator Arg = ArgRange.begin();
3701 assert((ParamsToSkip == 0 || CallArgTypeInfo) &&
3702 "Can't skip parameters if type info is not provided");
3703 if (CallArgTypeInfo) {
3705 bool isGenericMethod = isObjCMethodWithTypeParams(CallArgTypeInfo);
3708 // First, use the argument types that the type info knows about
3709 for (auto I = CallArgTypeInfo->param_type_begin() + ParamsToSkip,
3710 E = CallArgTypeInfo->param_type_end();
3711 I != E; ++I, ++Arg) {
3712 assert(Arg != ArgRange.end() && "Running over edge of argument list!");
3713 assert((isGenericMethod ||
3714 ((*I)->isVariablyModifiedType() ||
3715 (*I).getNonReferenceType()->isObjCRetainableType() ||
3717 .getCanonicalType((*I).getNonReferenceType())
3720 .getCanonicalType((*Arg)->getType())
3722 "type mismatch in call argument!");
3723 ArgTypes.push_back(*I);
3727 // Either we've emitted all the call args, or we have a call to variadic
3729 assert((Arg == ArgRange.end() || !CallArgTypeInfo ||
3730 CallArgTypeInfo->isVariadic()) &&
3731 "Extra arguments in non-variadic function!");
3733 // If we still have any arguments, emit them using the type of the argument.
3734 for (auto *A : llvm::make_range(Arg, ArgRange.end()))
3735 ArgTypes.push_back(CallArgTypeInfo ? getVarArgType(A) : A->getType());
3737 EmitCallArgs(Args, ArgTypes, ArgRange, AC, ParamsToSkip, Order);
3740 void EmitCallArgs(CallArgList &Args, ArrayRef<QualType> ArgTypes,
3741 llvm::iterator_range<CallExpr::const_arg_iterator> ArgRange,
3742 AbstractCallee AC = AbstractCallee(),
3743 unsigned ParamsToSkip = 0,
3744 EvaluationOrder Order = EvaluationOrder::Default);
3746 /// EmitPointerWithAlignment - Given an expression with a pointer
3747 /// type, emit the value and compute our best estimate of the
3748 /// alignment of the pointee.
3750 /// Note that this function will conservatively fall back on the type
3753 /// \param Source - If non-null, this will be initialized with
3754 /// information about the source of the alignment. Note that this
3755 /// function will conservatively fall back on the type when it
3756 /// doesn't recognize the expression, which means that sometimes
3758 /// a worst-case One
3759 /// reasonable way to use this information is when there's a
3760 /// language guarantee that the pointer must be aligned to some
3761 /// stricter value, and we're simply trying to ensure that
3762 /// sufficiently obvious uses of under-aligned objects don't get
3763 /// miscompiled; for example, a placement new into the address of
3764 /// a local variable. In such a case, it's quite reasonable to
3765 /// just ignore the returned alignment when it isn't from an
3766 /// explicit source.
3767 Address EmitPointerWithAlignment(const Expr *Addr,
3768 AlignmentSource *Source = nullptr);
3770 void EmitSanitizerStatReport(llvm::SanitizerStatKind SSK);
3773 QualType getVarArgType(const Expr *Arg);
3775 const TargetCodeGenInfo &getTargetHooks() const {
3776 return CGM.getTargetCodeGenInfo();
3779 void EmitDeclMetadata();
3781 BlockByrefHelpers *buildByrefHelpers(llvm::StructType &byrefType,
3782 const AutoVarEmission &emission);
3784 void AddObjCARCExceptionMetadata(llvm::Instruction *Inst);
3786 llvm::Value *GetValueForARMHint(unsigned BuiltinID);
3789 /// Helper class with most of the code for saving a value for a
3790 /// conditional expression cleanup.
3791 struct DominatingLLVMValue {
3792 typedef llvm::PointerIntPair<llvm::Value*, 1, bool> saved_type;
3794 /// Answer whether the given value needs extra work to be saved.
3795 static bool needsSaving(llvm::Value *value) {
3796 // If it's not an instruction, we don't need to save.
3797 if (!isa<llvm::Instruction>(value)) return false;
3799 // If it's an instruction in the entry block, we don't need to save.
3800 llvm::BasicBlock *block = cast<llvm::Instruction>(value)->getParent();
3801 return (block != &block->getParent()->getEntryBlock());
3804 /// Try to save the given value.
3805 static saved_type save(CodeGenFunction &CGF, llvm::Value *value) {
3806 if (!needsSaving(value)) return saved_type(value, false);
3808 // Otherwise, we need an alloca.
3809 auto align = CharUnits::fromQuantity(
3810 CGF.CGM.getDataLayout().getPrefTypeAlignment(value->getType()));
3812 CGF.CreateTempAlloca(value->getType(), align, "cond-cleanup.save");
3813 CGF.Builder.CreateStore(value, alloca);
3815 return saved_type(alloca.getPointer(), true);
3818 static llvm::Value *restore(CodeGenFunction &CGF, saved_type value) {
3819 // If the value says it wasn't saved, trust that it's still dominating.
3820 if (!value.getInt()) return value.getPointer();
3822 // Otherwise, it should be an alloca instruction, as set up in save().
3823 auto alloca = cast<llvm::AllocaInst>(value.getPointer());
3824 return CGF.Builder.CreateAlignedLoad(alloca, alloca->getAlignment());
3828 /// A partial specialization of DominatingValue for llvm::Values that
3829 /// might be llvm::Instructions.
3830 template <class T> struct DominatingPointer<T,true> : DominatingLLVMValue {
3832 static type restore(CodeGenFunction &CGF, saved_type value) {
3833 return static_cast<T*>(DominatingLLVMValue::restore(CGF, value));
3837 /// A specialization of DominatingValue for Address.
3838 template <> struct DominatingValue<Address> {
3839 typedef Address type;
3842 DominatingLLVMValue::saved_type SavedValue;
3843 CharUnits Alignment;
3846 static bool needsSaving(type value) {
3847 return DominatingLLVMValue::needsSaving(value.getPointer());
3849 static saved_type save(CodeGenFunction &CGF, type value) {
3850 return { DominatingLLVMValue::save(CGF, value.getPointer()),
3851 value.getAlignment() };
3853 static type restore(CodeGenFunction &CGF, saved_type value) {
3854 return Address(DominatingLLVMValue::restore(CGF, value.SavedValue),
3859 /// A specialization of DominatingValue for RValue.
3860 template <> struct DominatingValue<RValue> {
3861 typedef RValue type;
3863 enum Kind { ScalarLiteral, ScalarAddress, AggregateLiteral,
3864 AggregateAddress, ComplexAddress };
3868 unsigned Align : 29;
3869 saved_type(llvm::Value *v, Kind k, unsigned a = 0)
3870 : Value(v), K(k), Align(a) {}
3873 static bool needsSaving(RValue value);
3874 static saved_type save(CodeGenFunction &CGF, RValue value);
3875 RValue restore(CodeGenFunction &CGF);
3877 // implementations in CGCleanup.cpp
3880 static bool needsSaving(type value) {
3881 return saved_type::needsSaving(value);
3883 static saved_type save(CodeGenFunction &CGF, type value) {
3884 return saved_type::save(CGF, value);
3886 static type restore(CodeGenFunction &CGF, saved_type value) {
3887 return value.restore(CGF);
3891 } // end namespace CodeGen
3892 } // end namespace clang