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CGCleanup.h
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1 //===-- CGCleanup.h - Classes for cleanups IR generation --------*- C++ -*-===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // These classes support the generation of LLVM IR for cleanups.
10 //
11 //===----------------------------------------------------------------------===//
12 
13 #ifndef LLVM_CLANG_LIB_CODEGEN_CGCLEANUP_H
14 #define LLVM_CLANG_LIB_CODEGEN_CGCLEANUP_H
15 
16 #include "EHScopeStack.h"
17 
18 #include "Address.h"
19 #include "llvm/ADT/SmallPtrSet.h"
20 #include "llvm/ADT/SmallVector.h"
21 
22 namespace llvm {
23 class BasicBlock;
24 class Value;
25 class ConstantInt;
26 class AllocaInst;
27 }
28 
29 namespace clang {
30 class FunctionDecl;
31 namespace CodeGen {
32 class CodeGenModule;
33 class CodeGenFunction;
34 
35 /// The MS C++ ABI needs a pointer to RTTI data plus some flags to describe the
36 /// type of a catch handler, so we use this wrapper.
37 struct CatchTypeInfo {
38  llvm::Constant *RTTI;
39  unsigned Flags;
40 };
41 
42 /// A protected scope for zero-cost EH handling.
43 class EHScope {
44  llvm::BasicBlock *CachedLandingPad;
45  llvm::BasicBlock *CachedEHDispatchBlock;
46 
47  EHScopeStack::stable_iterator EnclosingEHScope;
48 
49  class CommonBitFields {
50  friend class EHScope;
51  unsigned Kind : 3;
52  };
53  enum { NumCommonBits = 3 };
54 
55 protected:
57  friend class EHCatchScope;
58  unsigned : NumCommonBits;
59 
60  unsigned NumHandlers : 32 - NumCommonBits;
61  };
62 
64  friend class EHCleanupScope;
65  unsigned : NumCommonBits;
66 
67  /// Whether this cleanup needs to be run along normal edges.
68  unsigned IsNormalCleanup : 1;
69 
70  /// Whether this cleanup needs to be run along exception edges.
71  unsigned IsEHCleanup : 1;
72 
73  /// Whether this cleanup is currently active.
74  unsigned IsActive : 1;
75 
76  /// Whether this cleanup is a lifetime marker
77  unsigned IsLifetimeMarker : 1;
78 
79  /// Whether the normal cleanup should test the activation flag.
80  unsigned TestFlagInNormalCleanup : 1;
81 
82  /// Whether the EH cleanup should test the activation flag.
83  unsigned TestFlagInEHCleanup : 1;
84 
85  /// The amount of extra storage needed by the Cleanup.
86  /// Always a multiple of the scope-stack alignment.
87  unsigned CleanupSize : 12;
88  };
89 
91  friend class EHFilterScope;
92  unsigned : NumCommonBits;
93 
94  unsigned NumFilters : 32 - NumCommonBits;
95  };
96 
97  union {
98  CommonBitFields CommonBits;
102  };
103 
104 public:
105  enum Kind { Cleanup, Catch, Terminate, Filter, PadEnd };
106 
108  : CachedLandingPad(nullptr), CachedEHDispatchBlock(nullptr),
109  EnclosingEHScope(enclosingEHScope) {
110  CommonBits.Kind = kind;
111  }
112 
113  Kind getKind() const { return static_cast<Kind>(CommonBits.Kind); }
114 
115  llvm::BasicBlock *getCachedLandingPad() const {
116  return CachedLandingPad;
117  }
118 
119  void setCachedLandingPad(llvm::BasicBlock *block) {
120  CachedLandingPad = block;
121  }
122 
123  llvm::BasicBlock *getCachedEHDispatchBlock() const {
124  return CachedEHDispatchBlock;
125  }
126 
127  void setCachedEHDispatchBlock(llvm::BasicBlock *block) {
128  CachedEHDispatchBlock = block;
129  }
130 
131  bool hasEHBranches() const {
132  if (llvm::BasicBlock *block = getCachedEHDispatchBlock())
133  return !block->use_empty();
134  return false;
135  }
136 
138  return EnclosingEHScope;
139  }
140 };
141 
142 /// A scope which attempts to handle some, possibly all, types of
143 /// exceptions.
144 ///
145 /// Objective C \@finally blocks are represented using a cleanup scope
146 /// after the catch scope.
147 class EHCatchScope : public EHScope {
148  // In effect, we have a flexible array member
149  // Handler Handlers[0];
150  // But that's only standard in C99, not C++, so we have to do
151  // annoying pointer arithmetic instead.
152 
153 public:
154  struct Handler {
155  /// A type info value, or null (C++ null, not an LLVM null pointer)
156  /// for a catch-all.
158 
159  /// The catch handler for this type.
160  llvm::BasicBlock *Block;
161 
162  bool isCatchAll() const { return Type.RTTI == nullptr; }
163  };
164 
165 private:
166  friend class EHScopeStack;
167 
168  Handler *getHandlers() {
169  return reinterpret_cast<Handler*>(this+1);
170  }
171 
172  const Handler *getHandlers() const {
173  return reinterpret_cast<const Handler*>(this+1);
174  }
175 
176 public:
177  static size_t getSizeForNumHandlers(unsigned N) {
178  return sizeof(EHCatchScope) + N * sizeof(Handler);
179  }
180 
181  EHCatchScope(unsigned numHandlers,
182  EHScopeStack::stable_iterator enclosingEHScope)
183  : EHScope(Catch, enclosingEHScope) {
184  CatchBits.NumHandlers = numHandlers;
185  assert(CatchBits.NumHandlers == numHandlers && "NumHandlers overflow?");
186  }
187 
188  unsigned getNumHandlers() const {
189  return CatchBits.NumHandlers;
190  }
191 
192  void setCatchAllHandler(unsigned I, llvm::BasicBlock *Block) {
193  setHandler(I, CatchTypeInfo{nullptr, 0}, Block);
194  }
195 
196  void setHandler(unsigned I, llvm::Constant *Type, llvm::BasicBlock *Block) {
197  assert(I < getNumHandlers());
198  getHandlers()[I].Type = CatchTypeInfo{Type, 0};
199  getHandlers()[I].Block = Block;
200  }
201 
202  void setHandler(unsigned I, CatchTypeInfo Type, llvm::BasicBlock *Block) {
203  assert(I < getNumHandlers());
204  getHandlers()[I].Type = Type;
205  getHandlers()[I].Block = Block;
206  }
207 
208  const Handler &getHandler(unsigned I) const {
209  assert(I < getNumHandlers());
210  return getHandlers()[I];
211  }
212 
213  // Clear all handler blocks.
214  // FIXME: it's better to always call clearHandlerBlocks in DTOR and have a
215  // 'takeHandler' or some such function which removes ownership from the
216  // EHCatchScope object if the handlers should live longer than EHCatchScope.
218  for (unsigned I = 0, N = getNumHandlers(); I != N; ++I)
219  delete getHandler(I).Block;
220  }
221 
222  typedef const Handler *iterator;
223  iterator begin() const { return getHandlers(); }
224  iterator end() const { return getHandlers() + getNumHandlers(); }
225 
226  static bool classof(const EHScope *Scope) {
227  return Scope->getKind() == Catch;
228  }
229 };
230 
231 /// A cleanup scope which generates the cleanup blocks lazily.
232 class alignas(8) EHCleanupScope : public EHScope {
233  /// The nearest normal cleanup scope enclosing this one.
234  EHScopeStack::stable_iterator EnclosingNormal;
235 
236  /// The nearest EH scope enclosing this one.
237  EHScopeStack::stable_iterator EnclosingEH;
238 
239  /// The dual entry/exit block along the normal edge. This is lazily
240  /// created if needed before the cleanup is popped.
241  llvm::BasicBlock *NormalBlock;
242 
243  /// An optional i1 variable indicating whether this cleanup has been
244  /// activated yet.
245  llvm::AllocaInst *ActiveFlag;
246 
247  /// Extra information required for cleanups that have resolved
248  /// branches through them. This has to be allocated on the side
249  /// because everything on the cleanup stack has be trivially
250  /// movable.
251  struct ExtInfo {
252  /// The destinations of normal branch-afters and branch-throughs.
253  llvm::SmallPtrSet<llvm::BasicBlock*, 4> Branches;
254 
255  /// Normal branch-afters.
257  BranchAfters;
258  };
259  mutable struct ExtInfo *ExtInfo;
260 
261  /// The number of fixups required by enclosing scopes (not including
262  /// this one). If this is the top cleanup scope, all the fixups
263  /// from this index onwards belong to this scope.
264  unsigned FixupDepth;
265 
266  struct ExtInfo &getExtInfo() {
267  if (!ExtInfo) ExtInfo = new struct ExtInfo();
268  return *ExtInfo;
269  }
270 
271  const struct ExtInfo &getExtInfo() const {
272  if (!ExtInfo) ExtInfo = new struct ExtInfo();
273  return *ExtInfo;
274  }
275 
276 public:
277  /// Gets the size required for a lazy cleanup scope with the given
278  /// cleanup-data requirements.
279  static size_t getSizeForCleanupSize(size_t Size) {
280  return sizeof(EHCleanupScope) + Size;
281  }
282 
283  size_t getAllocatedSize() const {
284  return sizeof(EHCleanupScope) + CleanupBits.CleanupSize;
285  }
286 
287  EHCleanupScope(bool isNormal, bool isEH, bool isActive,
288  unsigned cleanupSize, unsigned fixupDepth,
289  EHScopeStack::stable_iterator enclosingNormal,
290  EHScopeStack::stable_iterator enclosingEH)
291  : EHScope(EHScope::Cleanup, enclosingEH),
292  EnclosingNormal(enclosingNormal), NormalBlock(nullptr),
293  ActiveFlag(nullptr), ExtInfo(nullptr), FixupDepth(fixupDepth) {
294  CleanupBits.IsNormalCleanup = isNormal;
295  CleanupBits.IsEHCleanup = isEH;
296  CleanupBits.IsActive = isActive;
297  CleanupBits.IsLifetimeMarker = false;
298  CleanupBits.TestFlagInNormalCleanup = false;
299  CleanupBits.TestFlagInEHCleanup = false;
300  CleanupBits.CleanupSize = cleanupSize;
301 
302  assert(CleanupBits.CleanupSize == cleanupSize && "cleanup size overflow");
303  }
304 
305  void Destroy() {
306  delete ExtInfo;
307  }
308  // Objects of EHCleanupScope are not destructed. Use Destroy().
309  ~EHCleanupScope() = delete;
310 
311  bool isNormalCleanup() const { return CleanupBits.IsNormalCleanup; }
312  llvm::BasicBlock *getNormalBlock() const { return NormalBlock; }
313  void setNormalBlock(llvm::BasicBlock *BB) { NormalBlock = BB; }
314 
315  bool isEHCleanup() const { return CleanupBits.IsEHCleanup; }
316 
317  bool isActive() const { return CleanupBits.IsActive; }
318  void setActive(bool A) { CleanupBits.IsActive = A; }
319 
320  bool isLifetimeMarker() const { return CleanupBits.IsLifetimeMarker; }
321  void setLifetimeMarker() { CleanupBits.IsLifetimeMarker = true; }
322 
323  bool hasActiveFlag() const { return ActiveFlag != nullptr; }
325  return Address(ActiveFlag, CharUnits::One());
326  }
327  void setActiveFlag(Address Var) {
328  assert(Var.getAlignment().isOne());
329  ActiveFlag = cast<llvm::AllocaInst>(Var.getPointer());
330  }
331 
333  CleanupBits.TestFlagInNormalCleanup = true;
334  }
336  return CleanupBits.TestFlagInNormalCleanup;
337  }
338 
340  CleanupBits.TestFlagInEHCleanup = true;
341  }
343  return CleanupBits.TestFlagInEHCleanup;
344  }
345 
346  unsigned getFixupDepth() const { return FixupDepth; }
348  return EnclosingNormal;
349  }
350 
351  size_t getCleanupSize() const { return CleanupBits.CleanupSize; }
352  void *getCleanupBuffer() { return this + 1; }
353 
355  return reinterpret_cast<EHScopeStack::Cleanup*>(getCleanupBuffer());
356  }
357 
358  /// True if this cleanup scope has any branch-afters or branch-throughs.
359  bool hasBranches() const { return ExtInfo && !ExtInfo->Branches.empty(); }
360 
361  /// Add a branch-after to this cleanup scope. A branch-after is a
362  /// branch from a point protected by this (normal) cleanup to a
363  /// point in the normal cleanup scope immediately containing it.
364  /// For example,
365  /// for (;;) { A a; break; }
366  /// contains a branch-after.
367  ///
368  /// Branch-afters each have their own destination out of the
369  /// cleanup, guaranteed distinct from anything else threaded through
370  /// it. Therefore branch-afters usually force a switch after the
371  /// cleanup.
372  void addBranchAfter(llvm::ConstantInt *Index,
373  llvm::BasicBlock *Block) {
374  struct ExtInfo &ExtInfo = getExtInfo();
375  if (ExtInfo.Branches.insert(Block).second)
376  ExtInfo.BranchAfters.push_back(std::make_pair(Block, Index));
377  }
378 
379  /// Return the number of unique branch-afters on this scope.
380  unsigned getNumBranchAfters() const {
381  return ExtInfo ? ExtInfo->BranchAfters.size() : 0;
382  }
383 
384  llvm::BasicBlock *getBranchAfterBlock(unsigned I) const {
385  assert(I < getNumBranchAfters());
386  return ExtInfo->BranchAfters[I].first;
387  }
388 
389  llvm::ConstantInt *getBranchAfterIndex(unsigned I) const {
390  assert(I < getNumBranchAfters());
391  return ExtInfo->BranchAfters[I].second;
392  }
393 
394  /// Add a branch-through to this cleanup scope. A branch-through is
395  /// a branch from a scope protected by this (normal) cleanup to an
396  /// enclosing scope other than the immediately-enclosing normal
397  /// cleanup scope.
398  ///
399  /// In the following example, the branch through B's scope is a
400  /// branch-through, while the branch through A's scope is a
401  /// branch-after:
402  /// for (;;) { A a; B b; break; }
403  ///
404  /// All branch-throughs have a common destination out of the
405  /// cleanup, one possibly shared with the fall-through. Therefore
406  /// branch-throughs usually don't force a switch after the cleanup.
407  ///
408  /// \return true if the branch-through was new to this scope
409  bool addBranchThrough(llvm::BasicBlock *Block) {
410  return getExtInfo().Branches.insert(Block).second;
411  }
412 
413  /// Determines if this cleanup scope has any branch throughs.
414  bool hasBranchThroughs() const {
415  if (!ExtInfo) return false;
416  return (ExtInfo->BranchAfters.size() != ExtInfo->Branches.size());
417  }
418 
419  static bool classof(const EHScope *Scope) {
420  return (Scope->getKind() == Cleanup);
421  }
422 };
423 // NOTE: there's a bunch of different data classes tacked on after an
424 // EHCleanupScope. It is asserted (in EHScopeStack::pushCleanup*) that
425 // they don't require greater alignment than ScopeStackAlignment. So,
426 // EHCleanupScope ought to have alignment equal to that -- not more
427 // (would be misaligned by the stack allocator), and not less (would
428 // break the appended classes).
429 static_assert(alignof(EHCleanupScope) == EHScopeStack::ScopeStackAlignment,
430  "EHCleanupScope expected alignment");
431 
432 /// An exceptions scope which filters exceptions thrown through it.
433 /// Only exceptions matching the filter types will be permitted to be
434 /// thrown.
435 ///
436 /// This is used to implement C++ exception specifications.
437 class EHFilterScope : public EHScope {
438  // Essentially ends in a flexible array member:
439  // llvm::Value *FilterTypes[0];
440 
441  llvm::Value **getFilters() {
442  return reinterpret_cast<llvm::Value**>(this+1);
443  }
444 
445  llvm::Value * const *getFilters() const {
446  return reinterpret_cast<llvm::Value* const *>(this+1);
447  }
448 
449 public:
450  EHFilterScope(unsigned numFilters)
451  : EHScope(Filter, EHScopeStack::stable_end()) {
452  FilterBits.NumFilters = numFilters;
453  assert(FilterBits.NumFilters == numFilters && "NumFilters overflow");
454  }
455 
456  static size_t getSizeForNumFilters(unsigned numFilters) {
457  return sizeof(EHFilterScope) + numFilters * sizeof(llvm::Value*);
458  }
459 
460  unsigned getNumFilters() const { return FilterBits.NumFilters; }
461 
462  void setFilter(unsigned i, llvm::Value *filterValue) {
463  assert(i < getNumFilters());
464  getFilters()[i] = filterValue;
465  }
466 
467  llvm::Value *getFilter(unsigned i) const {
468  assert(i < getNumFilters());
469  return getFilters()[i];
470  }
471 
472  static bool classof(const EHScope *scope) {
473  return scope->getKind() == Filter;
474  }
475 };
476 
477 /// An exceptions scope which calls std::terminate if any exception
478 /// reaches it.
479 class EHTerminateScope : public EHScope {
480 public:
482  : EHScope(Terminate, enclosingEHScope) {}
483  static size_t getSize() { return sizeof(EHTerminateScope); }
484 
485  static bool classof(const EHScope *scope) {
486  return scope->getKind() == Terminate;
487  }
488 };
489 
490 class EHPadEndScope : public EHScope {
491 public:
493  : EHScope(PadEnd, enclosingEHScope) {}
494  static size_t getSize() { return sizeof(EHPadEndScope); }
495 
496  static bool classof(const EHScope *scope) {
497  return scope->getKind() == PadEnd;
498  }
499 };
500 
501 /// A non-stable pointer into the scope stack.
503  char *Ptr;
504 
505  friend class EHScopeStack;
506  explicit iterator(char *Ptr) : Ptr(Ptr) {}
507 
508 public:
509  iterator() : Ptr(nullptr) {}
510 
511  EHScope *get() const {
512  return reinterpret_cast<EHScope*>(Ptr);
513  }
514 
515  EHScope *operator->() const { return get(); }
516  EHScope &operator*() const { return *get(); }
517 
519  size_t Size;
520  switch (get()->getKind()) {
521  case EHScope::Catch:
522  Size = EHCatchScope::getSizeForNumHandlers(
523  static_cast<const EHCatchScope *>(get())->getNumHandlers());
524  break;
525 
526  case EHScope::Filter:
527  Size = EHFilterScope::getSizeForNumFilters(
528  static_cast<const EHFilterScope *>(get())->getNumFilters());
529  break;
530 
531  case EHScope::Cleanup:
532  Size = static_cast<const EHCleanupScope *>(get())->getAllocatedSize();
533  break;
534 
535  case EHScope::Terminate:
536  Size = EHTerminateScope::getSize();
537  break;
538 
539  case EHScope::PadEnd:
540  Size = EHPadEndScope::getSize();
541  break;
542  }
543  Ptr += llvm::alignTo(Size, ScopeStackAlignment);
544  return *this;
545  }
546 
548  iterator copy = *this;
549  ++copy;
550  return copy;
551  }
552 
554  iterator copy = *this;
555  operator++();
556  return copy;
557  }
558 
559  bool encloses(iterator other) const { return Ptr >= other.Ptr; }
560  bool strictlyEncloses(iterator other) const { return Ptr > other.Ptr; }
561 
562  bool operator==(iterator other) const { return Ptr == other.Ptr; }
563  bool operator!=(iterator other) const { return Ptr != other.Ptr; }
564 };
565 
566 inline EHScopeStack::iterator EHScopeStack::begin() const {
567  return iterator(StartOfData);
568 }
569 
570 inline EHScopeStack::iterator EHScopeStack::end() const {
571  return iterator(EndOfBuffer);
572 }
573 
574 inline void EHScopeStack::popCatch() {
575  assert(!empty() && "popping exception stack when not empty");
576 
577  EHCatchScope &scope = cast<EHCatchScope>(*begin());
578  InnermostEHScope = scope.getEnclosingEHScope();
579  deallocate(EHCatchScope::getSizeForNumHandlers(scope.getNumHandlers()));
580 }
581 
582 inline void EHScopeStack::popTerminate() {
583  assert(!empty() && "popping exception stack when not empty");
584 
585  EHTerminateScope &scope = cast<EHTerminateScope>(*begin());
586  InnermostEHScope = scope.getEnclosingEHScope();
587  deallocate(EHTerminateScope::getSize());
588 }
589 
590 inline EHScopeStack::iterator EHScopeStack::find(stable_iterator sp) const {
591  assert(sp.isValid() && "finding invalid savepoint");
592  assert(sp.Size <= stable_begin().Size && "finding savepoint after pop");
593  return iterator(EndOfBuffer - sp.Size);
594 }
595 
597 EHScopeStack::stabilize(iterator ir) const {
598  assert(StartOfData <= ir.Ptr && ir.Ptr <= EndOfBuffer);
599  return stable_iterator(EndOfBuffer - ir.Ptr);
600 }
601 
602 /// The exceptions personality for a function.
604  const char *PersonalityFn;
605 
606  // If this is non-null, this personality requires a non-standard
607  // function for rethrowing an exception after a catchall cleanup.
608  // This function must have prototype void(void*).
609  const char *CatchallRethrowFn;
610 
611  static const EHPersonality &get(CodeGenModule &CGM, const FunctionDecl *FD);
612  static const EHPersonality &get(CodeGenFunction &CGF);
613 
614  static const EHPersonality GNU_C;
615  static const EHPersonality GNU_C_SJLJ;
616  static const EHPersonality GNU_C_SEH;
617  static const EHPersonality GNU_ObjC;
621  static const EHPersonality GNU_ObjCXX;
622  static const EHPersonality NeXT_ObjC;
630 
631  /// Does this personality use landingpads or the family of pad instructions
632  /// designed to form funclets?
633  bool usesFuncletPads() const {
634  return isMSVCPersonality() || isWasmPersonality();
635  }
636 
637  bool isMSVCPersonality() const {
638  return this == &MSVC_except_handler || this == &MSVC_C_specific_handler ||
639  this == &MSVC_CxxFrameHandler3;
640  }
641 
642  bool isWasmPersonality() const { return this == &GNU_Wasm_CPlusPlus; }
643 
644  bool isMSVCXXPersonality() const { return this == &MSVC_CxxFrameHandler3; }
645 };
646 }
647 }
648 
649 #endif
CatchBitFields CatchBits
Definition: CGCleanup.h:99
Represents a function declaration or definition.
Definition: Decl.h:1737
EHScopeStack::stable_iterator getEnclosingEHScope() const
Definition: CGCleanup.h:137
void setCatchAllHandler(unsigned I, llvm::BasicBlock *Block)
Definition: CGCleanup.h:192
bool usesFuncletPads() const
Does this personality use landingpads or the family of pad instructions designed to form funclets...
Definition: CGCleanup.h:633
bool strictlyEncloses(iterator other) const
Definition: CGCleanup.h:560
llvm::BasicBlock * getCachedEHDispatchBlock() const
Definition: CGCleanup.h:123
static const EHPersonality GNU_C_SJLJ
Definition: CGCleanup.h:615
DominatorTree GraphTraits specialization so the DominatorTree can be iterable by generic graph iterat...
Definition: Dominators.h:29
static const EHPersonality MSVC_C_specific_handler
Definition: CGCleanup.h:627
static const EHPersonality MSVC_CxxFrameHandler3
Definition: CGCleanup.h:628
bool hasEHBranches() const
Definition: CGCleanup.h:131
static const EHPersonality GNU_C
Definition: CGCleanup.h:614
EHCatchScope(unsigned numHandlers, EHScopeStack::stable_iterator enclosingEHScope)
Definition: CGCleanup.h:181
The base class of the type hierarchy.
Definition: Type.h:1409
llvm::BasicBlock * getNormalBlock() const
Definition: CGCleanup.h:312
unsigned getNumFilters() const
Definition: CGCleanup.h:460
bool operator==(iterator other) const
Definition: CGCleanup.h:562
unsigned getNumHandlers() const
Definition: CGCleanup.h:188
llvm::Value * getPointer() const
Definition: Address.h:37
A protected scope for zero-cost EH handling.
Definition: CGCleanup.h:43
A scope which attempts to handle some, possibly all, types of exceptions.
Definition: CGCleanup.h:147
bool addBranchThrough(llvm::BasicBlock *Block)
Add a branch-through to this cleanup scope.
Definition: CGCleanup.h:409
bool operator!=(iterator other) const
Definition: CGCleanup.h:563
static size_t getSizeForCleanupSize(size_t Size)
Gets the size required for a lazy cleanup scope with the given cleanup-data requirements.
Definition: CGCleanup.h:279
An exceptions scope which calls std::terminate if any exception reaches it.
Definition: CGCleanup.h:479
bool isMSVCPersonality() const
Definition: CGCleanup.h:637
const char * CatchallRethrowFn
Definition: CGCleanup.h:609
CodeGenFunction - This class organizes the per-function state that is used while generating LLVM code...
static const EHPersonality GNU_CPlusPlus_SJLJ
Definition: CGCleanup.h:624
iterator end() const
Definition: CGCleanup.h:224
bool shouldTestFlagInNormalCleanup() const
Definition: CGCleanup.h:335
void setFilter(unsigned i, llvm::Value *filterValue)
Definition: CGCleanup.h:462
void setCachedLandingPad(llvm::BasicBlock *block)
Definition: CGCleanup.h:119
void setNormalBlock(llvm::BasicBlock *BB)
Definition: CGCleanup.h:313
bool isOne() const
isOne - Test whether the quantity equals one.
Definition: CharUnits.h:118
iterator begin() const
Definition: CGCleanup.h:223
CharUnits getAlignment() const
Return the alignment of this pointer.
Definition: Address.h:66
static bool classof(const EHScope *scope)
Definition: CGCleanup.h:472
const Handler & getHandler(unsigned I) const
Definition: CGCleanup.h:208
static const EHPersonality GNUstep_ObjC
Definition: CGCleanup.h:620
Scope - A scope is a transient data structure that is used while parsing the program.
Definition: Scope.h:40
A stack of scopes which respond to exceptions, including cleanups and catch blocks.
Definition: EHScopeStack.h:99
EHScope(Kind kind, EHScopeStack::stable_iterator enclosingEHScope)
Definition: CGCleanup.h:107
static size_t getSizeForNumHandlers(unsigned N)
Definition: CGCleanup.h:177
EHFilterScope(unsigned numFilters)
Definition: CGCleanup.h:450
static bool classof(const EHScope *Scope)
Definition: CGCleanup.h:419
unsigned getFixupDepth() const
Definition: CGCleanup.h:346
unsigned getNumBranchAfters() const
Return the number of unique branch-afters on this scope.
Definition: CGCleanup.h:380
static const EHPersonality MSVC_except_handler
Definition: CGCleanup.h:626
EHScopeStack::Cleanup * getCleanup()
Definition: CGCleanup.h:354
CatchTypeInfo Type
A type info value, or null (C++ null, not an LLVM null pointer) for a catch-all.
Definition: CGCleanup.h:157
size_t getCleanupSize() const
Definition: CGCleanup.h:351
static bool classof(const EHScope *Scope)
Definition: CGCleanup.h:226
llvm::BasicBlock * Block
The catch handler for this type.
Definition: CGCleanup.h:160
llvm::ConstantInt * getBranchAfterIndex(unsigned I) const
Definition: CGCleanup.h:389
static const EHPersonality GNU_ObjCXX
Definition: CGCleanup.h:621
static const EHPersonality GNU_ObjC_SEH
Definition: CGCleanup.h:619
void setActiveFlag(Address Var)
Definition: CGCleanup.h:327
CommonBitFields CommonBits
Definition: CGCleanup.h:98
size_t getAllocatedSize() const
Definition: CGCleanup.h:283
llvm::cl::opt< std::string > Filter
llvm::BasicBlock * getCachedLandingPad() const
Definition: CGCleanup.h:115
Kind
CleanupBitFields CleanupBits
Definition: CGCleanup.h:100
A saved depth on the scope stack.
Definition: EHScopeStack.h:106
EHScopeStack::stable_iterator getEnclosingNormalCleanup() const
Definition: CGCleanup.h:347
EHPadEndScope(EHScopeStack::stable_iterator enclosingEHScope)
Definition: CGCleanup.h:492
An aligned address.
Definition: Address.h:24
bool isWasmPersonality() const
Definition: CGCleanup.h:642
const Handler * iterator
Definition: CGCleanup.h:222
void setCachedEHDispatchBlock(llvm::BasicBlock *block)
Definition: CGCleanup.h:127
llvm::Value * getFilter(unsigned i) const
Definition: CGCleanup.h:467
The MS C++ ABI needs a pointer to RTTI data plus some flags to describe the type of a catch handler...
Definition: CGCleanup.h:37
static size_t getSizeForNumFilters(unsigned numFilters)
Definition: CGCleanup.h:456
static const EHPersonality NeXT_ObjC
Definition: CGCleanup.h:622
Kind getKind() const
Definition: CGCleanup.h:113
This class organizes the cross-function state that is used while generating LLVM code.
Optional< types::ID > Type
Dataflow Directional Tag Classes.
EHTerminateScope(EHScopeStack::stable_iterator enclosingEHScope)
Definition: CGCleanup.h:481
static const EHPersonality GNU_CPlusPlus_SEH
Definition: CGCleanup.h:625
bool shouldTestFlagInEHCleanup() const
Definition: CGCleanup.h:342
void addBranchAfter(llvm::ConstantInt *Index, llvm::BasicBlock *Block)
Add a branch-after to this cleanup scope.
Definition: CGCleanup.h:372
static const EHPersonality GNU_ObjC
Definition: CGCleanup.h:617
static bool classof(const EHScope *scope)
Definition: CGCleanup.h:496
bool isMSVCXXPersonality() const
Definition: CGCleanup.h:644
static const EHPersonality GNU_CPlusPlus
Definition: CGCleanup.h:623
static const EHPersonality GNU_ObjC_SJLJ
Definition: CGCleanup.h:618
bool hasBranches() const
True if this cleanup scope has any branch-afters or branch-throughs.
Definition: CGCleanup.h:359
Address getActiveFlag() const
Definition: CGCleanup.h:324
bool encloses(iterator other) const
Definition: CGCleanup.h:559
static const EHPersonality GNU_C_SEH
Definition: CGCleanup.h:616
The exceptions personality for a function.
Definition: CGCleanup.h:603
llvm::Constant * RTTI
Definition: CGCleanup.h:38
unsigned kind
All of the diagnostics that can be emitted by the frontend.
Definition: DiagnosticIDs.h:60
llvm::BasicBlock * getBranchAfterBlock(unsigned I) const
Definition: CGCleanup.h:384
A cleanup scope which generates the cleanup blocks lazily.
Definition: CGCleanup.h:232
bool hasBranchThroughs() const
Determines if this cleanup scope has any branch throughs.
Definition: CGCleanup.h:414
EHCleanupScope(bool isNormal, bool isEH, bool isActive, unsigned cleanupSize, unsigned fixupDepth, EHScopeStack::stable_iterator enclosingNormal, EHScopeStack::stable_iterator enclosingEH)
Definition: CGCleanup.h:287
static Decl::Kind getKind(const Decl *D)
Definition: DeclBase.cpp:956
An exceptions scope which filters exceptions thrown through it.
Definition: CGCleanup.h:437
static const EHPersonality GNU_Wasm_CPlusPlus
Definition: CGCleanup.h:629
Information for lazily generating a cleanup.
Definition: EHScopeStack.h:146
A non-stable pointer into the scope stack.
Definition: CGCleanup.h:502
void setHandler(unsigned I, CatchTypeInfo Type, llvm::BasicBlock *Block)
Definition: CGCleanup.h:202
void setHandler(unsigned I, llvm::Constant *Type, llvm::BasicBlock *Block)
Definition: CGCleanup.h:196
FilterBitFields FilterBits
Definition: CGCleanup.h:101
static bool classof(const EHScope *scope)
Definition: CGCleanup.h:485