clang  5.0.0
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 "CGRecordLayout.h"
19 #include "CodeGenFunction.h"
20 #include "CodeGenModule.h"
21 #include "clang/AST/RecordLayout.h"
22 #include "clang/AST/StmtObjC.h"
24 #include "llvm/IR/CallSite.h"
25 
26 using namespace clang;
27 using namespace CodeGen;
28 
30  const ObjCInterfaceDecl *OID,
31  const ObjCIvarDecl *Ivar) {
32  return CGM.getContext().lookupFieldBitOffset(OID, nullptr, Ivar) /
33  CGM.getContext().getCharWidth();
34 }
35 
37  const ObjCImplementationDecl *OID,
38  const ObjCIvarDecl *Ivar) {
39  return CGM.getContext().lookupFieldBitOffset(OID->getClassInterface(), OID,
40  Ivar) /
41  CGM.getContext().getCharWidth();
42 }
43 
46  const ObjCInterfaceDecl *ID,
47  const ObjCIvarDecl *Ivar) {
48  return CGM.getContext().lookupFieldBitOffset(ID, ID->getImplementation(),
49  Ivar);
50 }
51 
53  const ObjCInterfaceDecl *OID,
54  llvm::Value *BaseValue,
55  const ObjCIvarDecl *Ivar,
56  unsigned CVRQualifiers,
58  // Compute (type*) ( (char *) BaseValue + Offset)
59  QualType InterfaceTy{OID->getTypeForDecl(), 0};
60  QualType ObjectPtrTy =
61  CGF.CGM.getContext().getObjCObjectPointerType(InterfaceTy);
62  QualType IvarTy =
63  Ivar->getUsageType(ObjectPtrTy).withCVRQualifiers(CVRQualifiers);
64  llvm::Type *LTy = CGF.CGM.getTypes().ConvertTypeForMem(IvarTy);
65  llvm::Value *V = CGF.Builder.CreateBitCast(BaseValue, CGF.Int8PtrTy);
66  V = CGF.Builder.CreateInBoundsGEP(V, Offset, "add.ptr");
67 
68  if (!Ivar->isBitField()) {
69  V = CGF.Builder.CreateBitCast(V, llvm::PointerType::getUnqual(LTy));
70  LValue LV = CGF.MakeNaturalAlignAddrLValue(V, IvarTy);
71  return LV;
72  }
73 
74  // We need to compute an access strategy for this bit-field. We are given the
75  // offset to the first byte in the bit-field, the sub-byte offset is taken
76  // from the original layout. We reuse the normal bit-field access strategy by
77  // treating this as an access to a struct where the bit-field is in byte 0,
78  // and adjust the containing type size as appropriate.
79  //
80  // FIXME: Note that currently we make a very conservative estimate of the
81  // alignment of the bit-field, because (a) it is not clear what guarantees the
82  // runtime makes us, and (b) we don't have a way to specify that the struct is
83  // at an alignment plus offset.
84  //
85  // Note, there is a subtle invariant here: we can only call this routine on
86  // non-synthesized ivars but we may be called for synthesized ivars. However,
87  // a synthesized ivar can never be a bit-field, so this is safe.
88  uint64_t FieldBitOffset =
89  CGF.CGM.getContext().lookupFieldBitOffset(OID, nullptr, Ivar);
90  uint64_t BitOffset = FieldBitOffset % CGF.CGM.getContext().getCharWidth();
91  uint64_t AlignmentBits = CGF.CGM.getTarget().getCharAlign();
92  uint64_t BitFieldSize = Ivar->getBitWidthValue(CGF.getContext());
93  CharUnits StorageSize = CGF.CGM.getContext().toCharUnitsFromBits(
94  llvm::alignTo(BitOffset + BitFieldSize, AlignmentBits));
95  CharUnits Alignment = CGF.CGM.getContext().toCharUnitsFromBits(AlignmentBits);
96 
97  // Allocate a new CGBitFieldInfo object to describe this access.
98  //
99  // FIXME: This is incredibly wasteful, these should be uniqued or part of some
100  // layout object. However, this is blocked on other cleanups to the
101  // Objective-C code, so for now we just live with allocating a bunch of these
102  // objects.
103  CGBitFieldInfo *Info = new (CGF.CGM.getContext()) CGBitFieldInfo(
104  CGBitFieldInfo::MakeInfo(CGF.CGM.getTypes(), Ivar, BitOffset, BitFieldSize,
105  CGF.CGM.getContext().toBits(StorageSize),
107 
108  Address Addr(V, Alignment);
109  Addr = CGF.Builder.CreateElementBitCast(Addr,
110  llvm::Type::getIntNTy(CGF.getLLVMContext(),
111  Info->StorageSize));
112  return LValue::MakeBitfield(Addr, *Info, IvarTy,
114 }
115 
116 namespace {
117  struct CatchHandler {
118  const VarDecl *Variable;
119  const Stmt *Body;
120  llvm::BasicBlock *Block;
121  llvm::Constant *TypeInfo;
122  };
123 
124  struct CallObjCEndCatch final : EHScopeStack::Cleanup {
125  CallObjCEndCatch(bool MightThrow, llvm::Value *Fn)
126  : MightThrow(MightThrow), Fn(Fn) {}
127  bool MightThrow;
128  llvm::Value *Fn;
129 
130  void Emit(CodeGenFunction &CGF, Flags flags) override {
131  if (MightThrow)
132  CGF.EmitRuntimeCallOrInvoke(Fn);
133  else
134  CGF.EmitNounwindRuntimeCall(Fn);
135  }
136  };
137 }
138 
139 
141  const ObjCAtTryStmt &S,
142  llvm::Constant *beginCatchFn,
143  llvm::Constant *endCatchFn,
144  llvm::Constant *exceptionRethrowFn) {
145  // Jump destination for falling out of catch bodies.
147  if (S.getNumCatchStmts())
148  Cont = CGF.getJumpDestInCurrentScope("eh.cont");
149 
150  CodeGenFunction::FinallyInfo FinallyInfo;
151  if (const ObjCAtFinallyStmt *Finally = S.getFinallyStmt())
152  FinallyInfo.enter(CGF, Finally->getFinallyBody(),
153  beginCatchFn, endCatchFn, exceptionRethrowFn);
154 
156 
157  // Enter the catch, if there is one.
158  if (S.getNumCatchStmts()) {
159  for (unsigned I = 0, N = S.getNumCatchStmts(); I != N; ++I) {
160  const ObjCAtCatchStmt *CatchStmt = S.getCatchStmt(I);
161  const VarDecl *CatchDecl = CatchStmt->getCatchParamDecl();
162 
163  Handlers.push_back(CatchHandler());
164  CatchHandler &Handler = Handlers.back();
165  Handler.Variable = CatchDecl;
166  Handler.Body = CatchStmt->getCatchBody();
167  Handler.Block = CGF.createBasicBlock("catch");
168 
169  // @catch(...) always matches.
170  if (!CatchDecl) {
171  Handler.TypeInfo = nullptr; // catch-all
172  // Don't consider any other catches.
173  break;
174  }
175 
176  Handler.TypeInfo = GetEHType(CatchDecl->getType());
177  }
178 
179  EHCatchScope *Catch = CGF.EHStack.pushCatch(Handlers.size());
180  for (unsigned I = 0, E = Handlers.size(); I != E; ++I)
181  Catch->setHandler(I, Handlers[I].TypeInfo, Handlers[I].Block);
182  }
183 
184  // Emit the try body.
185  CGF.EmitStmt(S.getTryBody());
186 
187  // Leave the try.
188  if (S.getNumCatchStmts())
189  CGF.popCatchScope();
190 
191  // Remember where we were.
192  CGBuilderTy::InsertPoint SavedIP = CGF.Builder.saveAndClearIP();
193 
194  // Emit the handlers.
195  for (unsigned I = 0, E = Handlers.size(); I != E; ++I) {
196  CatchHandler &Handler = Handlers[I];
197 
198  CGF.EmitBlock(Handler.Block);
199  llvm::Value *RawExn = CGF.getExceptionFromSlot();
200 
201  // Enter the catch.
202  llvm::Value *Exn = RawExn;
203  if (beginCatchFn)
204  Exn = CGF.EmitNounwindRuntimeCall(beginCatchFn, RawExn, "exn.adjusted");
205 
206  CodeGenFunction::LexicalScope cleanups(CGF, Handler.Body->getSourceRange());
207 
208  if (endCatchFn) {
209  // Add a cleanup to leave the catch.
210  bool EndCatchMightThrow = (Handler.Variable == nullptr);
211 
212  CGF.EHStack.pushCleanup<CallObjCEndCatch>(NormalAndEHCleanup,
213  EndCatchMightThrow,
214  endCatchFn);
215  }
216 
217  // Bind the catch parameter if it exists.
218  if (const VarDecl *CatchParam = Handler.Variable) {
219  llvm::Type *CatchType = CGF.ConvertType(CatchParam->getType());
220  llvm::Value *CastExn = CGF.Builder.CreateBitCast(Exn, CatchType);
221 
222  CGF.EmitAutoVarDecl(*CatchParam);
223  EmitInitOfCatchParam(CGF, CastExn, CatchParam);
224  }
225 
226  CGF.ObjCEHValueStack.push_back(Exn);
227  CGF.EmitStmt(Handler.Body);
228  CGF.ObjCEHValueStack.pop_back();
229 
230  // Leave any cleanups associated with the catch.
231  cleanups.ForceCleanup();
232 
233  CGF.EmitBranchThroughCleanup(Cont);
234  }
235 
236  // Go back to the try-statement fallthrough.
237  CGF.Builder.restoreIP(SavedIP);
238 
239  // Pop out of the finally.
240  if (S.getFinallyStmt())
241  FinallyInfo.exit(CGF);
242 
243  if (Cont.isValid())
244  CGF.EmitBlock(Cont.getBlock());
245 }
246 
248  llvm::Value *exn,
249  const VarDecl *paramDecl) {
250 
251  Address paramAddr = CGF.GetAddrOfLocalVar(paramDecl);
252 
253  switch (paramDecl->getType().getQualifiers().getObjCLifetime()) {
255  exn = CGF.EmitARCRetainNonBlock(exn);
256  // fallthrough
257 
261  CGF.Builder.CreateStore(exn, paramAddr);
262  return;
263 
265  CGF.EmitARCInitWeak(paramAddr, exn);
266  return;
267  }
268  llvm_unreachable("invalid ownership qualifier");
269 }
270 
271 namespace {
272  struct CallSyncExit final : EHScopeStack::Cleanup {
273  llvm::Value *SyncExitFn;
274  llvm::Value *SyncArg;
275  CallSyncExit(llvm::Value *SyncExitFn, llvm::Value *SyncArg)
276  : SyncExitFn(SyncExitFn), SyncArg(SyncArg) {}
277 
278  void Emit(CodeGenFunction &CGF, Flags flags) override {
279  CGF.Builder.CreateCall(SyncExitFn, SyncArg)->setDoesNotThrow();
280  }
281  };
282 }
283 
285  const ObjCAtSynchronizedStmt &S,
286  llvm::Function *syncEnterFn,
287  llvm::Function *syncExitFn) {
288  CodeGenFunction::RunCleanupsScope cleanups(CGF);
289 
290  // Evaluate the lock operand. This is guaranteed to dominate the
291  // ARC release and lock-release cleanups.
292  const Expr *lockExpr = S.getSynchExpr();
293  llvm::Value *lock;
294  if (CGF.getLangOpts().ObjCAutoRefCount) {
295  lock = CGF.EmitARCRetainScalarExpr(lockExpr);
296  lock = CGF.EmitObjCConsumeObject(lockExpr->getType(), lock);
297  } else {
298  lock = CGF.EmitScalarExpr(lockExpr);
299  }
300  lock = CGF.Builder.CreateBitCast(lock, CGF.VoidPtrTy);
301 
302  // Acquire the lock.
303  CGF.Builder.CreateCall(syncEnterFn, lock)->setDoesNotThrow();
304 
305  // Register an all-paths cleanup to release the lock.
306  CGF.EHStack.pushCleanup<CallSyncExit>(NormalAndEHCleanup, syncExitFn, lock);
307 
308  // Emit the body of the statement.
309  CGF.EmitStmt(S.getSynchBody());
310 }
311 
312 /// Compute the pointer-to-function type to which a message send
313 /// should be casted in order to correctly call the given method
314 /// with the given arguments.
315 ///
316 /// \param method - may be null
317 /// \param resultType - the result type to use if there's no method
318 /// \param callArgs - the actual arguments, including implicit ones
321  QualType resultType,
322  CallArgList &callArgs) {
323  // If there's a method, use information from that.
324  if (method) {
325  const CGFunctionInfo &signature =
326  CGM.getTypes().arrangeObjCMessageSendSignature(method, callArgs[0].Ty);
327 
328  llvm::PointerType *signatureType =
329  CGM.getTypes().GetFunctionType(signature)->getPointerTo();
330 
331  const CGFunctionInfo &signatureForCall =
332  CGM.getTypes().arrangeCall(signature, callArgs);
333 
334  return MessageSendInfo(signatureForCall, signatureType);
335  }
336 
337  // There's no method; just use a default CC.
338  const CGFunctionInfo &argsInfo =
339  CGM.getTypes().arrangeUnprototypedObjCMessageSend(resultType, callArgs);
340 
341  // Derive the signature to call from that.
342  llvm::PointerType *signatureType =
343  CGM.getTypes().GetFunctionType(argsInfo)->getPointerTo();
344  return MessageSendInfo(argsInfo, signatureType);
345 }
const ObjCAtFinallyStmt * getFinallyStmt() const
Retrieve the @finally statement, if any.
Definition: StmtObjC.h:224
A (possibly-)qualified type.
Definition: Type.h:616
bool isBitField() const
Determines whether this field is a bitfield.
Definition: Decl.h:2434
Stmt - This represents one statement.
Definition: Stmt.h:60
void EmitAutoVarDecl(const VarDecl &D)
EmitAutoVarDecl - Emit an auto variable declaration.
Definition: CGDecl.cpp:921
The l-value was an access to a declared entity or something equivalently strong, like the address of ...
const LangOptions & getLangOpts() const
llvm::Value * EmitARCRetainNonBlock(llvm::Value *value)
Retain the given object, with normal retain semantics.
Definition: CGObjC.cpp:1983
Address GetAddrOfLocalVar(const VarDecl *VD)
GetAddrOfLocalVar - Return the address of a local variable.
const Type * getTypeForDecl() const
Definition: DeclObjC.h:1836
VarDecl - An instance of this class is created to represent a variable declaration or definition...
Definition: Decl.h:758
uint64_t ComputeIvarBaseOffset(CodeGen::CodeGenModule &CGM, const ObjCInterfaceDecl *OID, const ObjCIvarDecl *Ivar)
Compute an offset to the given ivar, suitable for passing to EmitValueForIvarAtOffset.
static LValue MakeBitfield(Address Addr, const CGBitFieldInfo &Info, QualType type, LValueBaseInfo BaseInfo)
Create a new object to represent a bit-field access.
Definition: CGValue.h:429
ObjCLifetime getObjCLifetime() const
Definition: Type.h:309
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:1765
ObjCMethodDecl - Represents an instance or class method declaration.
Definition: DeclObjC.h:113
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)
const VarDecl * getCatchParamDecl() const
Definition: StmtObjC.h:94
class EHCatchScope * pushCatch(unsigned NumHandlers)
Push a set of catch handlers on the stack.
Definition: CGCleanup.cpp:251
Represents Objective-C's @catch statement.
Definition: StmtObjC.h:74
const CompoundStmt * getSynchBody() const
Definition: StmtObjC.h:282
A class controlling the emission of a finally block.
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:150
CharUnits - This is an opaque type for sizes expressed in character units.
Definition: CharUnits.h:38
uint32_t Offset
Definition: CacheTokens.cpp:43
CodeGen::CodeGenModule & CGM
Definition: CGObjCRuntime.h:65
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:455
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:685
const Stmt * getCatchBody() const
Definition: StmtObjC.h:90
void EmitStmt(const Stmt *S)
EmitStmt - Emit the code for the statement.
Definition: CGStmt.cpp:48
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:2969
const ObjCAtCatchStmt * getCatchStmt(unsigned I) const
Retrieve a @catch statement.
Definition: StmtObjC.h:206
Represents an ObjC class declaration.
Definition: DeclObjC.h:1108
detail::InMemoryDirectory::const_iterator I
QualType getType() const
Definition: Decl.h:589
This object can be modified without requiring retains or releases.
Definition: Type.h:139
const CGFunctionInfo & arrangeUnprototypedObjCMessageSend(QualType returnType, const CallArgList &args)
Definition: CGCall.cpp:482
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:3644
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="")
const TargetInfo & getTarget() const
unsigned getCharAlign() const
Definition: TargetInfo.h:332
Expr - This represents one expression.
Definition: Expr.h:105
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...
ASTContext & getContext() const
llvm::BasicBlock * getBlock() const
Represents Objective-C'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's exception object and selector slots.
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()
CharUnits toCharUnitsFromBits(int64_t BitSize) const
Convert a size in bits to a size in characters.
LValue MakeNaturalAlignAddrLValue(llvm::Value *V, QualType T)
unsigned ComputeBitfieldBitOffset(CodeGen::CodeGenModule &CGM, const ObjCInterfaceDecl *ID, const ObjCIvarDecl *Ivar)
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:135
Address CreateBitCast(Address Addr, llvm::Type *Ty, const llvm::Twine &Name="")
Definition: CGBuilder.h:142
uint64_t lookupFieldBitOffset(const ObjCInterfaceDecl *OID, const ObjCImplementationDecl *ID, const ObjCIvarDecl *Ivar) const
Get the offset of an ObjCIvarDecl in bits.
Assigning into this object requires the old value to be released and the new value to be retained...
Definition: Type.h:146
ASTContext & getContext() const
QualType withCVRQualifiers(unsigned CVR) const
Definition: Type.h:802
unsigned getBitWidthValue(const ASTContext &Ctx) const
Definition: Decl.cpp:3599
SmallVector< llvm::Value *, 8 > ObjCEHValueStack
ObjCEHValueStack - Stack of Objective-C exception values, used for rethrows.
const std::string ID
const ObjCInterfaceDecl * getClassInterface() const
Definition: DeclObjC.h:2341
An aligned address.
Definition: Address.h:25
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:152
llvm::Value * EmitScalarExpr(const Expr *E, bool IgnoreResultAssign=false)
EmitScalarExpr - Emit the computation of the specified expression of LLVM scalar type, returning the result.
QualType getType() const
Definition: Expr.h:127
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 Expr * getSynchExpr() const
Definition: StmtObjC.h:290
QualType getObjCObjectPointerType(QualType OIT) const
Return a ObjCObjectPointerType type for the given ObjCObjectType.
unsigned StorageSize
The storage size in bits which should be used when accessing this bitfield.
detail::InMemoryDirectory::const_iterator E
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:2448
Represents Objective-C's @finally statement.
Definition: StmtObjC.h:120
uint64_t getCharWidth() const
Return the size of the character type, in bits.
Definition: ASTContext.h:1928
ObjCImplementationDecl * getImplementation() const
Definition: DeclObjC.cpp:1503
void EmitBlock(llvm::BasicBlock *BB, bool IsFinished=false)
EmitBlock - Emit the given block.
Definition: CGStmt.cpp:436
void EmitARCInitWeak(Address addr, llvm::Value *value)
i8* @objc_initWeak(i8** addr, i8* value) Returns value.
Definition: CGObjC.cpp:2280
unsigned getNumCatchStmts() const
Retrieve the number of @catch statements in this try-catch-finally block.
Definition: StmtObjC.h:203
Reading or writing from this object requires a barrier call.
Definition: Type.h:149
llvm::Type * ConvertType(QualType T)
ObjCIvarDecl - Represents an ObjC instance variable.
Definition: DeclObjC.h:1866
Represents Objective-C's @try ... @catch ... @finally statement.
Definition: StmtObjC.h:154
const Stmt * getTryBody() const
Retrieve the @try body.
Definition: StmtObjC.h:197
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)
void EmitBranchThroughCleanup(JumpDest Dest)
EmitBranchThroughCleanup - Emit a branch from the current insert block through the normal cleanup han...
Definition: CGCleanup.cpp:1034
int64_t toBits(CharUnits CharSize) const
Convert a size in characters to a size in bits.
LValue - This represents an lvalue references.
Definition: CGValue.h:171
Information for lazily generating a cleanup.
Definition: EHScopeStack.h:147
llvm::Value * EmitObjCConsumeObject(QualType T, llvm::Value *Ptr)
Produce the code for a CK_ARCConsumeObject.
Definition: CGObjC.cpp:1790
virtual llvm::Constant * GetEHType(QualType T)=0
Get the type constant to catch for the given ObjC pointer type.
CallArgList - Type for representing both the value and type of arguments in a call.
Definition: CGCall.h:182
void setHandler(unsigned I, llvm::Constant *Type, llvm::BasicBlock *Block)
Definition: CGCleanup.h:197
Structure with information about how a bitfield should be accessed.
Qualifiers getQualifiers() const
Retrieve the set of qualifiers applied to this type.
Definition: Type.h:5516
llvm::FunctionType * GetFunctionType(const CGFunctionInfo &Info)
GetFunctionType - Get the LLVM function type for.
Definition: CGCall.cpp:1519