clang  8.0.0svn
CGObjCRuntime.cpp
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1 //==- CGObjCRuntime.cpp - Interface to Shared Objective-C Runtime Features ==//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // This abstract class defines the interface for Objective-C runtime-specific
11 // code generation. It provides some concrete helper methods for functionality
12 // shared between all (or most) of the Objective-C runtimes supported by clang.
13 //
14 //===----------------------------------------------------------------------===//
15 
16 #include "CGObjCRuntime.h"
17 #include "CGCleanup.h"
18 #include "CGCXXABI.h"
19 #include "CGRecordLayout.h"
20 #include "CodeGenFunction.h"
21 #include "CodeGenModule.h"
22 #include "clang/AST/RecordLayout.h"
23 #include "clang/AST/StmtObjC.h"
25 #include "llvm/IR/CallSite.h"
26 #include "llvm/Support/SaveAndRestore.h"
27 
28 using namespace clang;
29 using namespace CodeGen;
30 
32  const ObjCInterfaceDecl *OID,
33  const ObjCIvarDecl *Ivar) {
34  return CGM.getContext().lookupFieldBitOffset(OID, nullptr, Ivar) /
35  CGM.getContext().getCharWidth();
36 }
37 
39  const ObjCImplementationDecl *OID,
40  const ObjCIvarDecl *Ivar) {
41  return CGM.getContext().lookupFieldBitOffset(OID->getClassInterface(), OID,
42  Ivar) /
43  CGM.getContext().getCharWidth();
44 }
45 
48  const ObjCInterfaceDecl *ID,
49  const ObjCIvarDecl *Ivar) {
50  return CGM.getContext().lookupFieldBitOffset(ID, ID->getImplementation(),
51  Ivar);
52 }
53 
55  const ObjCInterfaceDecl *OID,
56  llvm::Value *BaseValue,
57  const ObjCIvarDecl *Ivar,
58  unsigned CVRQualifiers,
60  // Compute (type*) ( (char *) BaseValue + Offset)
61  QualType InterfaceTy{OID->getTypeForDecl(), 0};
62  QualType ObjectPtrTy =
63  CGF.CGM.getContext().getObjCObjectPointerType(InterfaceTy);
64  QualType IvarTy =
65  Ivar->getUsageType(ObjectPtrTy).withCVRQualifiers(CVRQualifiers);
66  llvm::Type *LTy = CGF.CGM.getTypes().ConvertTypeForMem(IvarTy);
67  llvm::Value *V = CGF.Builder.CreateBitCast(BaseValue, CGF.Int8PtrTy);
68  V = CGF.Builder.CreateInBoundsGEP(V, Offset, "add.ptr");
69 
70  if (!Ivar->isBitField()) {
71  V = CGF.Builder.CreateBitCast(V, llvm::PointerType::getUnqual(LTy));
72  LValue LV = CGF.MakeNaturalAlignAddrLValue(V, IvarTy);
73  return LV;
74  }
75 
76  // We need to compute an access strategy for this bit-field. We are given the
77  // offset to the first byte in the bit-field, the sub-byte offset is taken
78  // from the original layout. We reuse the normal bit-field access strategy by
79  // treating this as an access to a struct where the bit-field is in byte 0,
80  // and adjust the containing type size as appropriate.
81  //
82  // FIXME: Note that currently we make a very conservative estimate of the
83  // alignment of the bit-field, because (a) it is not clear what guarantees the
84  // runtime makes us, and (b) we don't have a way to specify that the struct is
85  // at an alignment plus offset.
86  //
87  // Note, there is a subtle invariant here: we can only call this routine on
88  // non-synthesized ivars but we may be called for synthesized ivars. However,
89  // a synthesized ivar can never be a bit-field, so this is safe.
90  uint64_t FieldBitOffset =
91  CGF.CGM.getContext().lookupFieldBitOffset(OID, nullptr, Ivar);
92  uint64_t BitOffset = FieldBitOffset % CGF.CGM.getContext().getCharWidth();
93  uint64_t AlignmentBits = CGF.CGM.getTarget().getCharAlign();
94  uint64_t BitFieldSize = Ivar->getBitWidthValue(CGF.getContext());
95  CharUnits StorageSize = CGF.CGM.getContext().toCharUnitsFromBits(
96  llvm::alignTo(BitOffset + BitFieldSize, AlignmentBits));
97  CharUnits Alignment = CGF.CGM.getContext().toCharUnitsFromBits(AlignmentBits);
98 
99  // Allocate a new CGBitFieldInfo object to describe this access.
100  //
101  // FIXME: This is incredibly wasteful, these should be uniqued or part of some
102  // layout object. However, this is blocked on other cleanups to the
103  // Objective-C code, so for now we just live with allocating a bunch of these
104  // objects.
105  CGBitFieldInfo *Info = new (CGF.CGM.getContext()) CGBitFieldInfo(
106  CGBitFieldInfo::MakeInfo(CGF.CGM.getTypes(), Ivar, BitOffset, BitFieldSize,
107  CGF.CGM.getContext().toBits(StorageSize),
109 
110  Address Addr(V, Alignment);
111  Addr = CGF.Builder.CreateElementBitCast(Addr,
112  llvm::Type::getIntNTy(CGF.getLLVMContext(),
113  Info->StorageSize));
114  return LValue::MakeBitfield(Addr, *Info, IvarTy,
116  TBAAAccessInfo());
117 }
118 
119 namespace {
120  struct CatchHandler {
121  const VarDecl *Variable;
122  const Stmt *Body;
123  llvm::BasicBlock *Block;
124  llvm::Constant *TypeInfo;
125  /// Flags used to differentiate cleanups and catchalls in Windows SEH
126  unsigned Flags;
127  };
128 
129  struct CallObjCEndCatch final : EHScopeStack::Cleanup {
130  CallObjCEndCatch(bool MightThrow, llvm::Value *Fn)
131  : MightThrow(MightThrow), Fn(Fn) {}
132  bool MightThrow;
133  llvm::Value *Fn;
134 
135  void Emit(CodeGenFunction &CGF, Flags flags) override {
136  if (MightThrow)
137  CGF.EmitRuntimeCallOrInvoke(Fn);
138  else
139  CGF.EmitNounwindRuntimeCall(Fn);
140  }
141  };
142 }
143 
144 
146  const ObjCAtTryStmt &S,
147  llvm::Constant *beginCatchFn,
148  llvm::Constant *endCatchFn,
149  llvm::Constant *exceptionRethrowFn) {
150  // Jump destination for falling out of catch bodies.
152  if (S.getNumCatchStmts())
153  Cont = CGF.getJumpDestInCurrentScope("eh.cont");
154 
155  bool useFunclets = EHPersonality::get(CGF).usesFuncletPads();
156 
157  CodeGenFunction::FinallyInfo FinallyInfo;
158  if (!useFunclets)
159  if (const ObjCAtFinallyStmt *Finally = S.getFinallyStmt())
160  FinallyInfo.enter(CGF, Finally->getFinallyBody(),
161  beginCatchFn, endCatchFn, exceptionRethrowFn);
162 
164 
165 
166  // Enter the catch, if there is one.
167  if (S.getNumCatchStmts()) {
168  for (unsigned I = 0, N = S.getNumCatchStmts(); I != N; ++I) {
169  const ObjCAtCatchStmt *CatchStmt = S.getCatchStmt(I);
170  const VarDecl *CatchDecl = CatchStmt->getCatchParamDecl();
171 
172  Handlers.push_back(CatchHandler());
173  CatchHandler &Handler = Handlers.back();
174  Handler.Variable = CatchDecl;
175  Handler.Body = CatchStmt->getCatchBody();
176  Handler.Block = CGF.createBasicBlock("catch");
177  Handler.Flags = 0;
178 
179  // @catch(...) always matches.
180  if (!CatchDecl) {
181  auto catchAll = getCatchAllTypeInfo();
182  Handler.TypeInfo = catchAll.RTTI;
183  Handler.Flags = catchAll.Flags;
184  // Don't consider any other catches.
185  break;
186  }
187 
188  Handler.TypeInfo = GetEHType(CatchDecl->getType());
189  }
190 
191  EHCatchScope *Catch = CGF.EHStack.pushCatch(Handlers.size());
192  for (unsigned I = 0, E = Handlers.size(); I != E; ++I)
193  Catch->setHandler(I, { Handlers[I].TypeInfo, Handlers[I].Flags }, Handlers[I].Block);
194  }
195 
196  if (useFunclets)
197  if (const ObjCAtFinallyStmt *Finally = S.getFinallyStmt()) {
198  CodeGenFunction HelperCGF(CGM, /*suppressNewContext=*/true);
199  if (!CGF.CurSEHParent)
200  CGF.CurSEHParent = cast<NamedDecl>(CGF.CurFuncDecl);
201  // Outline the finally block.
202  const Stmt *FinallyBlock = Finally->getFinallyBody();
203  HelperCGF.startOutlinedSEHHelper(CGF, /*isFilter*/false, FinallyBlock);
204 
205  // Emit the original filter expression, convert to i32, and return.
206  HelperCGF.EmitStmt(FinallyBlock);
207 
208  HelperCGF.FinishFunction(FinallyBlock->getEndLoc());
209 
210  llvm::Function *FinallyFunc = HelperCGF.CurFn;
211 
212 
213  // Push a cleanup for __finally blocks.
214  CGF.pushSEHCleanup(NormalAndEHCleanup, FinallyFunc);
215  }
216 
217 
218  // Emit the try body.
219  CGF.EmitStmt(S.getTryBody());
220 
221  // Leave the try.
222  if (S.getNumCatchStmts())
223  CGF.popCatchScope();
224 
225  // Remember where we were.
226  CGBuilderTy::InsertPoint SavedIP = CGF.Builder.saveAndClearIP();
227 
228  // Emit the handlers.
229  for (unsigned I = 0, E = Handlers.size(); I != E; ++I) {
230  CatchHandler &Handler = Handlers[I];
231 
232  CGF.EmitBlock(Handler.Block);
233  llvm::CatchPadInst *CPI = nullptr;
234  SaveAndRestore<llvm::Instruction *> RestoreCurrentFuncletPad(CGF.CurrentFuncletPad);
235  if (useFunclets)
236  if ((CPI = dyn_cast_or_null<llvm::CatchPadInst>(Handler.Block->getFirstNonPHI()))) {
237  CGF.CurrentFuncletPad = CPI;
238  CPI->setOperand(2, CGF.getExceptionSlot().getPointer());
239  }
240  llvm::Value *RawExn = CGF.getExceptionFromSlot();
241 
242  // Enter the catch.
243  llvm::Value *Exn = RawExn;
244  if (beginCatchFn)
245  Exn = CGF.EmitNounwindRuntimeCall(beginCatchFn, RawExn, "exn.adjusted");
246 
247  CodeGenFunction::LexicalScope cleanups(CGF, Handler.Body->getSourceRange());
248 
249  if (endCatchFn) {
250  // Add a cleanup to leave the catch.
251  bool EndCatchMightThrow = (Handler.Variable == nullptr);
252 
253  CGF.EHStack.pushCleanup<CallObjCEndCatch>(NormalAndEHCleanup,
254  EndCatchMightThrow,
255  endCatchFn);
256  }
257 
258  // Bind the catch parameter if it exists.
259  if (const VarDecl *CatchParam = Handler.Variable) {
260  llvm::Type *CatchType = CGF.ConvertType(CatchParam->getType());
261  llvm::Value *CastExn = CGF.Builder.CreateBitCast(Exn, CatchType);
262 
263  CGF.EmitAutoVarDecl(*CatchParam);
264  EmitInitOfCatchParam(CGF, CastExn, CatchParam);
265  }
266  if (CPI)
267  CGF.EHStack.pushCleanup<CatchRetScope>(NormalCleanup, CPI);
268 
269  CGF.ObjCEHValueStack.push_back(Exn);
270  CGF.EmitStmt(Handler.Body);
271  CGF.ObjCEHValueStack.pop_back();
272 
273  // Leave any cleanups associated with the catch.
274  cleanups.ForceCleanup();
275 
276  CGF.EmitBranchThroughCleanup(Cont);
277  }
278 
279  // Go back to the try-statement fallthrough.
280  CGF.Builder.restoreIP(SavedIP);
281 
282  // Pop out of the finally.
283  if (!useFunclets && S.getFinallyStmt())
284  FinallyInfo.exit(CGF);
285 
286  if (Cont.isValid())
287  CGF.EmitBlock(Cont.getBlock());
288 }
289 
291  llvm::Value *exn,
292  const VarDecl *paramDecl) {
293 
294  Address paramAddr = CGF.GetAddrOfLocalVar(paramDecl);
295 
296  switch (paramDecl->getType().getQualifiers().getObjCLifetime()) {
298  exn = CGF.EmitARCRetainNonBlock(exn);
299  LLVM_FALLTHROUGH;
300 
304  CGF.Builder.CreateStore(exn, paramAddr);
305  return;
306 
308  CGF.EmitARCInitWeak(paramAddr, exn);
309  return;
310  }
311  llvm_unreachable("invalid ownership qualifier");
312 }
313 
314 namespace {
315  struct CallSyncExit final : EHScopeStack::Cleanup {
316  llvm::Value *SyncExitFn;
317  llvm::Value *SyncArg;
318  CallSyncExit(llvm::Value *SyncExitFn, llvm::Value *SyncArg)
319  : SyncExitFn(SyncExitFn), SyncArg(SyncArg) {}
320 
321  void Emit(CodeGenFunction &CGF, Flags flags) override {
322  CGF.EmitNounwindRuntimeCall(SyncExitFn, SyncArg);
323  }
324  };
325 }
326 
328  const ObjCAtSynchronizedStmt &S,
329  llvm::Function *syncEnterFn,
330  llvm::Function *syncExitFn) {
331  CodeGenFunction::RunCleanupsScope cleanups(CGF);
332 
333  // Evaluate the lock operand. This is guaranteed to dominate the
334  // ARC release and lock-release cleanups.
335  const Expr *lockExpr = S.getSynchExpr();
336  llvm::Value *lock;
337  if (CGF.getLangOpts().ObjCAutoRefCount) {
338  lock = CGF.EmitARCRetainScalarExpr(lockExpr);
339  lock = CGF.EmitObjCConsumeObject(lockExpr->getType(), lock);
340  } else {
341  lock = CGF.EmitScalarExpr(lockExpr);
342  }
343  lock = CGF.Builder.CreateBitCast(lock, CGF.VoidPtrTy);
344 
345  // Acquire the lock.
346  CGF.Builder.CreateCall(syncEnterFn, lock)->setDoesNotThrow();
347 
348  // Register an all-paths cleanup to release the lock.
349  CGF.EHStack.pushCleanup<CallSyncExit>(NormalAndEHCleanup, syncExitFn, lock);
350 
351  // Emit the body of the statement.
352  CGF.EmitStmt(S.getSynchBody());
353 }
354 
355 /// Compute the pointer-to-function type to which a message send
356 /// should be casted in order to correctly call the given method
357 /// with the given arguments.
358 ///
359 /// \param method - may be null
360 /// \param resultType - the result type to use if there's no method
361 /// \param callArgs - the actual arguments, including implicit ones
364  QualType resultType,
365  CallArgList &callArgs) {
366  // If there's a method, use information from that.
367  if (method) {
368  const CGFunctionInfo &signature =
369  CGM.getTypes().arrangeObjCMessageSendSignature(method, callArgs[0].Ty);
370 
371  llvm::PointerType *signatureType =
372  CGM.getTypes().GetFunctionType(signature)->getPointerTo();
373 
374  const CGFunctionInfo &signatureForCall =
375  CGM.getTypes().arrangeCall(signature, callArgs);
376 
377  return MessageSendInfo(signatureForCall, signatureType);
378  }
379 
380  // There's no method; just use a default CC.
381  const CGFunctionInfo &argsInfo =
382  CGM.getTypes().arrangeUnprototypedObjCMessageSend(resultType, callArgs);
383 
384  // Derive the signature to call from that.
385  llvm::PointerType *signatureType =
386  CGM.getTypes().GetFunctionType(argsInfo)->getPointerTo();
387  return MessageSendInfo(argsInfo, signatureType);
388 }
const Type * getTypeForDecl() const
Definition: DeclObjC.h:1911
A (possibly-)qualified type.
Definition: Type.h:642
bool usesFuncletPads() const
Does this personality use landingpads or the family of pad instructions designed to form funclets...
Definition: CGCleanup.h:634
Stmt - This represents one statement.
Definition: Stmt.h:66
const ObjCAtFinallyStmt * getFinallyStmt() const
Retrieve the @finally statement, if any.
Definition: StmtObjC.h:224
void EmitAutoVarDecl(const VarDecl &D)
EmitAutoVarDecl - Emit an auto variable declaration.
Definition: CGDecl.cpp:1057
The l-value was an access to a declared entity or something equivalently strong, like the address of ...
llvm::Value * EmitARCRetainNonBlock(llvm::Value *value)
Retain the given object, with normal retain semantics.
Definition: CGObjC.cpp:2023
Address GetAddrOfLocalVar(const VarDecl *VD)
GetAddrOfLocalVar - Return the address of a local variable.
Represents a variable declaration or definition.
Definition: Decl.h:812
uint64_t ComputeIvarBaseOffset(CodeGen::CodeGenModule &CGM, const ObjCInterfaceDecl *OID, const ObjCIvarDecl *Ivar)
Compute an offset to the given ivar, suitable for passing to EmitValueForIvarAtOffset.
unsigned getCharAlign() const
Definition: TargetInfo.h:371
ObjCMethodDecl - Represents an instance or class method declaration.
Definition: DeclObjC.h:139
llvm::Value * getPointer() const
Definition: Address.h:38
Defines the Objective-C statement AST node classes.
llvm::Type * ConvertTypeForMem(QualType T)
ConvertTypeForMem - Convert type T into a llvm::Type.
A scope which attempts to handle some, possibly all, types of exceptions.
Definition: CGCleanup.h:148
A jump destination is an abstract label, branching to which may require a jump out through normal cle...
void popCatchScope()
popCatchScope - Pops the catch scope at the top of the EHScope stack, emitting any required code (oth...
CodeGenFunction - This class organizes the per-function state that is used while generating LLVM code...
void EmitInitOfCatchParam(CodeGenFunction &CGF, llvm::Value *exn, const VarDecl *paramDecl)
static const EHPersonality & get(CodeGenModule &CGM, const FunctionDecl *FD)
uint64_t lookupFieldBitOffset(const ObjCInterfaceDecl *OID, const ObjCImplementationDecl *ID, const ObjCIvarDecl *Ivar) const
Get the offset of an ObjCIvarDecl in bits.
Address getExceptionSlot()
Returns a pointer to the function&#39;s exception object and selector slot, which is assigned in every la...
class EHCatchScope * pushCatch(unsigned NumHandlers)
Push a set of catch handlers on the stack.
Definition: CGCleanup.cpp:251
Represents Objective-C&#39;s @catch statement.
Definition: StmtObjC.h:74
A class controlling the emission of a finally block.
bool isBitField() const
Determines whether this field is a bitfield.
Definition: Decl.h:2666
MessageSendInfo getMessageSendInfo(const ObjCMethodDecl *method, QualType resultType, CallArgList &callArgs)
Compute the pointer-to-function type to which a message send should be casted in order to correctly c...
Address CreateElementBitCast(Address Addr, llvm::Type *Ty, const llvm::Twine &Name="")
Cast the element type of the given address to a different type, preserving information like the align...
Definition: CGBuilder.h:157
CharUnits - This is an opaque type for sizes expressed in character units.
Definition: CharUnits.h:38
CodeGen::CodeGenModule & CGM
Definition: CGObjCRuntime.h:66
const CGFunctionInfo & arrangeObjCMessageSendSignature(const ObjCMethodDecl *MD, QualType receiverType)
Arrange the argument and result information for the function type through which to perform a send to ...
Definition: CGCall.cpp:472
const CGFunctionInfo & arrangeCall(const CGFunctionInfo &declFI, const CallArgList &args)
Given a function info for a declaration, return the function info for a call with the given arguments...
Definition: CGCall.cpp:706
unsigned getBitWidthValue(const ASTContext &Ctx) const
Definition: Decl.cpp:3801
llvm::BasicBlock * createBasicBlock(const Twine &name="", llvm::Function *parent=nullptr, llvm::BasicBlock *before=nullptr)
createBasicBlock - Create an LLVM basic block.
llvm::Value * EmitARCRetainScalarExpr(const Expr *expr)
EmitARCRetainScalarExpr - Semantically equivalent to EmitARCRetainObject(e->getType(), EmitScalarExpr(e)), but making a best-effort attempt to peephole expressions that naturally produce retained objects.
Definition: CGObjC.cpp:3061
Denotes a cleanup that should run when a scope is exited using normal control flow (falling off the e...
Definition: EHScopeStack.h:85
Represents an ObjC class declaration.
Definition: DeclObjC.h:1164
This object can be modified without requiring retains or releases.
Definition: Type.h:162
const CGFunctionInfo & arrangeUnprototypedObjCMessageSend(QualType returnType, const CallArgList &args)
Definition: CGCall.cpp:503
const ObjCAtCatchStmt * getCatchStmt(unsigned I) const
Retrieve a @catch statement.
Definition: StmtObjC.h:206
static CGBitFieldInfo MakeInfo(class CodeGenTypes &Types, const FieldDecl *FD, uint64_t Offset, uint64_t Size, uint64_t StorageSize, CharUnits StorageOffset)
Given a bit-field decl, build an appropriate helper object for accessing that field (which is expecte...
llvm::CallInst * EmitNounwindRuntimeCall(llvm::Value *callee, const Twine &name="")
QualType getUsageType(QualType objectType) const
Retrieve the type of this instance variable when viewed as a member of a specific object type...
Definition: DeclObjC.cpp:1814
unsigned Offset
Definition: Format.cpp:1631
This represents one expression.
Definition: Expr.h:106
void enter(CodeGenFunction &CGF, const Stmt *Finally, llvm::Constant *beginCatchFn, llvm::Constant *endCatchFn, llvm::Constant *rethrowFn)
Enters a finally block for an implementation using zero-cost exceptions.
Enters a new scope for capturing cleanups, all of which will be executed once the scope is exited...
ObjCLifetime getObjCLifetime() const
Definition: Type.h:330
const CompoundStmt * getSynchBody() const
Definition: StmtObjC.h:282
void pushSEHCleanup(CleanupKind kind, llvm::Function *FinallyFunc)
Represents Objective-C&#39;s @synchronized statement.
Definition: StmtObjC.h:262
static CharUnits fromQuantity(QuantityType Quantity)
fromQuantity - Construct a CharUnits quantity from a raw integer type.
Definition: CharUnits.h:63
llvm::Value * getExceptionFromSlot()
Returns the contents of the function&#39;s exception object and selector slots.
static LValue MakeBitfield(Address Addr, const CGBitFieldInfo &Info, QualType type, LValueBaseInfo BaseInfo, TBAAAccessInfo TBAAInfo)
Create a new object to represent a bit-field access.
Definition: CGValue.h:410
void EmitAtSynchronizedStmt(CodeGenFunction &CGF, const ObjCAtSynchronizedStmt &S, llvm::Function *syncEnterFn, llvm::Function *syncExitFn)
Emits an @synchronize() statement, using the syncEnterFn and syncExitFn arguments as the functions ca...
llvm::LLVMContext & getLLVMContext()
QualType getType() const
Definition: Expr.h:128
const Stmt * getTryBody() const
Retrieve the @try body.
Definition: StmtObjC.h:197
LValue MakeNaturalAlignAddrLValue(llvm::Value *V, QualType T)
unsigned ComputeBitfieldBitOffset(CodeGen::CodeGenModule &CGM, const ObjCInterfaceDecl *ID, const ObjCIvarDecl *Ivar)
const TargetInfo & getTarget() const
ASTContext & getContext() const
The l-value was considered opaque, so the alignment was determined from a type.
There is no lifetime qualification on this type.
Definition: Type.h:158
Address CreateBitCast(Address Addr, llvm::Type *Ty, const llvm::Twine &Name="")
Definition: CGBuilder.h:142
Assigning into this object requires the old value to be released and the new value to be retained...
Definition: Type.h:169
virtual CatchTypeInfo getCatchAllTypeInfo()
const Stmt * getCatchBody() const
Definition: StmtObjC.h:90
SmallVector< llvm::Value *, 8 > ObjCEHValueStack
ObjCEHValueStack - Stack of Objective-C exception values, used for rethrows.
llvm::CallSite EmitRuntimeCallOrInvoke(llvm::Value *callee, ArrayRef< llvm::Value *> args, const Twine &name="")
Emits a call or invoke instruction to the given runtime function.
Definition: CGCall.cpp:3754
void EmitStmt(const Stmt *S, ArrayRef< const Attr *> Attrs=None)
EmitStmt - Emit the code for the statement.
Definition: CGStmt.cpp:46
An aligned address.
Definition: Address.h:25
llvm::Instruction * CurrentFuncletPad
JumpDest getJumpDestInCurrentScope(llvm::BasicBlock *Target)
The given basic block lies in the current EH scope, but may be a target of a potentially scope-crossi...
Assigning into this object requires a lifetime extension.
Definition: Type.h:175
ObjCImplementationDecl * getImplementation() const
Definition: DeclObjC.cpp:1549
void FinishFunction(SourceLocation EndLoc=SourceLocation())
FinishFunction - Complete IR generation of the current function.
llvm::Value * EmitScalarExpr(const Expr *E, bool IgnoreResultAssign=false)
EmitScalarExpr - Emit the computation of the specified expression of LLVM scalar type, returning the result.
CGFunctionInfo - Class to encapsulate the information about a function definition.
This class organizes the cross-function state that is used while generating LLVM code.
const ObjCInterfaceDecl * getClassInterface() const
Definition: DeclObjC.h:2432
Dataflow Directional Tag Classes.
unsigned StorageSize
The storage size in bits which should be used when accessing this bitfield.
const Expr * getSynchExpr() const
Definition: StmtObjC.h:290
llvm::StoreInst * CreateStore(llvm::Value *Val, Address Addr, bool IsVolatile=false)
Definition: CGBuilder.h:108
ObjCImplementationDecl - Represents a class definition - this is where method definitions are specifi...
Definition: DeclObjC.h:2544
uint64_t getCharWidth() const
Return the size of the character type, in bits.
Definition: ASTContext.h:2073
Represents Objective-C&#39;s @finally statement.
Definition: StmtObjC.h:120
void EmitBlock(llvm::BasicBlock *BB, bool IsFinished=false)
EmitBlock - Emit the given block.
Definition: CGStmt.cpp:443
void EmitARCInitWeak(Address addr, llvm::Value *value)
i8* @objc_initWeak(i8** addr, i8* value) Returns value.
Definition: CGObjC.cpp:2320
const Decl * CurFuncDecl
CurFuncDecl - Holds the Decl for the current outermost non-closure context.
QualType withCVRQualifiers(unsigned CVR) const
Definition: Type.h:834
CharUnits toCharUnitsFromBits(int64_t BitSize) const
Convert a size in bits to a size in characters.
Reading or writing from this object requires a barrier call.
Definition: Type.h:172
int64_t toBits(CharUnits CharSize) const
Convert a size in characters to a size in bits.
llvm::Type * ConvertType(QualType T)
Qualifiers getQualifiers() const
Retrieve the set of qualifiers applied to this type.
Definition: Type.h:6085
ObjCIvarDecl - Represents an ObjC instance variable.
Definition: DeclObjC.h:1937
Represents Objective-C&#39;s @try ... @catch ... @finally statement.
Definition: StmtObjC.h:154
unsigned getNumCatchStmts() const
Retrieve the number of @catch statements in this try-catch-finally block.
Definition: StmtObjC.h:203
void startOutlinedSEHHelper(CodeGenFunction &ParentCGF, bool IsFilter, const Stmt *OutlinedStmt)
Arrange a function prototype that can be called by Windows exception handling personalities.
void EmitTryCatchStmt(CodeGenFunction &CGF, const ObjCAtTryStmt &S, llvm::Constant *beginCatchFn, llvm::Constant *endCatchFn, llvm::Constant *exceptionRethrowFn)
Emits a try / catch statement.
LValue EmitValueForIvarAtOffset(CodeGen::CodeGenFunction &CGF, const ObjCInterfaceDecl *OID, llvm::Value *BaseValue, const ObjCIvarDecl *Ivar, unsigned CVRQualifiers, llvm::Value *Offset)
const VarDecl * getCatchParamDecl() const
Definition: StmtObjC.h:94
void EmitBranchThroughCleanup(JumpDest Dest)
EmitBranchThroughCleanup - Emit a branch from the current insert block through the normal cleanup han...
Definition: CGCleanup.cpp:1050
QualType getType() const
Definition: Decl.h:647
LValue - This represents an lvalue references.
Definition: CGValue.h:167
Information for lazily generating a cleanup.
Definition: EHScopeStack.h:147
QualType getObjCObjectPointerType(QualType OIT) const
Return a ObjCObjectPointerType type for the given ObjCObjectType.
llvm::Value * EmitObjCConsumeObject(QualType T, llvm::Value *Ptr)
Produce the code for a CK_ARCConsumeObject.
Definition: CGObjC.cpp:1848
virtual llvm::Constant * GetEHType(QualType T)=0
Get the type constant to catch for the given ObjC pointer type.
const LangOptions & getLangOpts() const
CallArgList - Type for representing both the value and type of arguments in a call.
Definition: CGCall.h:260
void setHandler(unsigned I, llvm::Constant *Type, llvm::BasicBlock *Block)
Definition: CGCleanup.h:197
Structure with information about how a bitfield should be accessed.
llvm::FunctionType * GetFunctionType(const CGFunctionInfo &Info)
GetFunctionType - Get the LLVM function type for.
Definition: CGCall.cpp:1548