clang  6.0.0svn
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 "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  TBAAAccessInfo());
115 }
116 
117 namespace {
118  struct CatchHandler {
119  const VarDecl *Variable;
120  const Stmt *Body;
121  llvm::BasicBlock *Block;
122  llvm::Constant *TypeInfo;
123  };
124 
125  struct CallObjCEndCatch final : EHScopeStack::Cleanup {
126  CallObjCEndCatch(bool MightThrow, llvm::Value *Fn)
127  : MightThrow(MightThrow), Fn(Fn) {}
128  bool MightThrow;
129  llvm::Value *Fn;
130 
131  void Emit(CodeGenFunction &CGF, Flags flags) override {
132  if (MightThrow)
133  CGF.EmitRuntimeCallOrInvoke(Fn);
134  else
135  CGF.EmitNounwindRuntimeCall(Fn);
136  }
137  };
138 }
139 
140 
142  const ObjCAtTryStmt &S,
143  llvm::Constant *beginCatchFn,
144  llvm::Constant *endCatchFn,
145  llvm::Constant *exceptionRethrowFn) {
146  // Jump destination for falling out of catch bodies.
148  if (S.getNumCatchStmts())
149  Cont = CGF.getJumpDestInCurrentScope("eh.cont");
150 
151  CodeGenFunction::FinallyInfo FinallyInfo;
152  if (const ObjCAtFinallyStmt *Finally = S.getFinallyStmt())
153  FinallyInfo.enter(CGF, Finally->getFinallyBody(),
154  beginCatchFn, endCatchFn, exceptionRethrowFn);
155 
157 
158  // Enter the catch, if there is one.
159  if (S.getNumCatchStmts()) {
160  for (unsigned I = 0, N = S.getNumCatchStmts(); I != N; ++I) {
161  const ObjCAtCatchStmt *CatchStmt = S.getCatchStmt(I);
162  const VarDecl *CatchDecl = CatchStmt->getCatchParamDecl();
163 
164  Handlers.push_back(CatchHandler());
165  CatchHandler &Handler = Handlers.back();
166  Handler.Variable = CatchDecl;
167  Handler.Body = CatchStmt->getCatchBody();
168  Handler.Block = CGF.createBasicBlock("catch");
169 
170  // @catch(...) always matches.
171  if (!CatchDecl) {
172  Handler.TypeInfo = nullptr; // catch-all
173  // Don't consider any other catches.
174  break;
175  }
176 
177  Handler.TypeInfo = GetEHType(CatchDecl->getType());
178  }
179 
180  EHCatchScope *Catch = CGF.EHStack.pushCatch(Handlers.size());
181  for (unsigned I = 0, E = Handlers.size(); I != E; ++I)
182  Catch->setHandler(I, Handlers[I].TypeInfo, Handlers[I].Block);
183  }
184 
185  // Emit the try body.
186  CGF.EmitStmt(S.getTryBody());
187 
188  // Leave the try.
189  if (S.getNumCatchStmts())
190  CGF.popCatchScope();
191 
192  // Remember where we were.
193  CGBuilderTy::InsertPoint SavedIP = CGF.Builder.saveAndClearIP();
194 
195  // Emit the handlers.
196  for (unsigned I = 0, E = Handlers.size(); I != E; ++I) {
197  CatchHandler &Handler = Handlers[I];
198 
199  CGF.EmitBlock(Handler.Block);
200  llvm::Value *RawExn = CGF.getExceptionFromSlot();
201 
202  // Enter the catch.
203  llvm::Value *Exn = RawExn;
204  if (beginCatchFn)
205  Exn = CGF.EmitNounwindRuntimeCall(beginCatchFn, RawExn, "exn.adjusted");
206 
207  CodeGenFunction::LexicalScope cleanups(CGF, Handler.Body->getSourceRange());
208 
209  if (endCatchFn) {
210  // Add a cleanup to leave the catch.
211  bool EndCatchMightThrow = (Handler.Variable == nullptr);
212 
213  CGF.EHStack.pushCleanup<CallObjCEndCatch>(NormalAndEHCleanup,
214  EndCatchMightThrow,
215  endCatchFn);
216  }
217 
218  // Bind the catch parameter if it exists.
219  if (const VarDecl *CatchParam = Handler.Variable) {
220  llvm::Type *CatchType = CGF.ConvertType(CatchParam->getType());
221  llvm::Value *CastExn = CGF.Builder.CreateBitCast(Exn, CatchType);
222 
223  CGF.EmitAutoVarDecl(*CatchParam);
224  EmitInitOfCatchParam(CGF, CastExn, CatchParam);
225  }
226 
227  CGF.ObjCEHValueStack.push_back(Exn);
228  CGF.EmitStmt(Handler.Body);
229  CGF.ObjCEHValueStack.pop_back();
230 
231  // Leave any cleanups associated with the catch.
232  cleanups.ForceCleanup();
233 
234  CGF.EmitBranchThroughCleanup(Cont);
235  }
236 
237  // Go back to the try-statement fallthrough.
238  CGF.Builder.restoreIP(SavedIP);
239 
240  // Pop out of the finally.
241  if (S.getFinallyStmt())
242  FinallyInfo.exit(CGF);
243 
244  if (Cont.isValid())
245  CGF.EmitBlock(Cont.getBlock());
246 }
247 
249  llvm::Value *exn,
250  const VarDecl *paramDecl) {
251 
252  Address paramAddr = CGF.GetAddrOfLocalVar(paramDecl);
253 
254  switch (paramDecl->getType().getQualifiers().getObjCLifetime()) {
256  exn = CGF.EmitARCRetainNonBlock(exn);
257  // fallthrough
258 
262  CGF.Builder.CreateStore(exn, paramAddr);
263  return;
264 
266  CGF.EmitARCInitWeak(paramAddr, exn);
267  return;
268  }
269  llvm_unreachable("invalid ownership qualifier");
270 }
271 
272 namespace {
273  struct CallSyncExit final : EHScopeStack::Cleanup {
274  llvm::Value *SyncExitFn;
275  llvm::Value *SyncArg;
276  CallSyncExit(llvm::Value *SyncExitFn, llvm::Value *SyncArg)
277  : SyncExitFn(SyncExitFn), SyncArg(SyncArg) {}
278 
279  void Emit(CodeGenFunction &CGF, Flags flags) override {
280  CGF.Builder.CreateCall(SyncExitFn, SyncArg)->setDoesNotThrow();
281  }
282  };
283 }
284 
286  const ObjCAtSynchronizedStmt &S,
287  llvm::Function *syncEnterFn,
288  llvm::Function *syncExitFn) {
289  CodeGenFunction::RunCleanupsScope cleanups(CGF);
290 
291  // Evaluate the lock operand. This is guaranteed to dominate the
292  // ARC release and lock-release cleanups.
293  const Expr *lockExpr = S.getSynchExpr();
294  llvm::Value *lock;
295  if (CGF.getLangOpts().ObjCAutoRefCount) {
296  lock = CGF.EmitARCRetainScalarExpr(lockExpr);
297  lock = CGF.EmitObjCConsumeObject(lockExpr->getType(), lock);
298  } else {
299  lock = CGF.EmitScalarExpr(lockExpr);
300  }
301  lock = CGF.Builder.CreateBitCast(lock, CGF.VoidPtrTy);
302 
303  // Acquire the lock.
304  CGF.Builder.CreateCall(syncEnterFn, lock)->setDoesNotThrow();
305 
306  // Register an all-paths cleanup to release the lock.
307  CGF.EHStack.pushCleanup<CallSyncExit>(NormalAndEHCleanup, syncExitFn, lock);
308 
309  // Emit the body of the statement.
310  CGF.EmitStmt(S.getSynchBody());
311 }
312 
313 /// Compute the pointer-to-function type to which a message send
314 /// should be casted in order to correctly call the given method
315 /// with the given arguments.
316 ///
317 /// \param method - may be null
318 /// \param resultType - the result type to use if there's no method
319 /// \param callArgs - the actual arguments, including implicit ones
322  QualType resultType,
323  CallArgList &callArgs) {
324  // If there's a method, use information from that.
325  if (method) {
326  const CGFunctionInfo &signature =
327  CGM.getTypes().arrangeObjCMessageSendSignature(method, callArgs[0].Ty);
328 
329  llvm::PointerType *signatureType =
330  CGM.getTypes().GetFunctionType(signature)->getPointerTo();
331 
332  const CGFunctionInfo &signatureForCall =
333  CGM.getTypes().arrangeCall(signature, callArgs);
334 
335  return MessageSendInfo(signatureForCall, signatureType);
336  }
337 
338  // There's no method; just use a default CC.
339  const CGFunctionInfo &argsInfo =
340  CGM.getTypes().arrangeUnprototypedObjCMessageSend(resultType, callArgs);
341 
342  // Derive the signature to call from that.
343  llvm::PointerType *signatureType =
344  CGM.getTypes().GetFunctionType(argsInfo)->getPointerTo();
345  return MessageSendInfo(argsInfo, signatureType);
346 }
const Type * getTypeForDecl() const
Definition: DeclObjC.h:1938
A (possibly-)qualified type.
Definition: Type.h:653
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:929
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:1981
Address GetAddrOfLocalVar(const VarDecl *VD)
GetAddrOfLocalVar - Return the address of a local variable.
VarDecl - An instance of this class is created to represent a variable declaration or definition...
Definition: Decl.h:806
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:334
ObjCMethodDecl - Represents an instance or class method declaration.
Definition: DeclObjC.h:139
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)
uint64_t lookupFieldBitOffset(const ObjCInterfaceDecl *OID, const ObjCImplementationDecl *ID, const ObjCIvarDecl *Ivar) const
Get the offset of an ObjCIvarDecl in bits.
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:2535
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
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:689
unsigned getBitWidthValue(const ASTContext &Ctx) const
Definition: Decl.cpp:3633
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:2967
Represents an ObjC class declaration.
Definition: DeclObjC.h:1191
This object can be modified without requiring retains or releases.
Definition: Type.h:173
const CGFunctionInfo & arrangeUnprototypedObjCMessageSend(QualType returnType, const CallArgList &args)
Definition: CGCall.cpp:486
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:1778
Expr - 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:341
const CompoundStmt * getSynchBody() const
Definition: StmtObjC.h:282
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:407
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:169
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:180
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:3666
void EmitStmt(const Stmt *S, ArrayRef< const Attr *> Attrs=None)
EmitStmt - Emit the code for the statement.
Definition: CGStmt.cpp:48
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:186
ObjCImplementationDecl * getImplementation() const
Definition: DeclObjC.cpp:1513
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:2459
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:2571
uint64_t getCharWidth() const
Return the size of the character type, in bits.
Definition: ASTContext.h:2011
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:436
void EmitARCInitWeak(Address addr, llvm::Value *value)
i8* @objc_initWeak(i8** addr, i8* value) Returns value.
Definition: CGObjC.cpp:2278
QualType withCVRQualifiers(unsigned CVR) const
Definition: Type.h:838
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:183
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:5747
ObjCIvarDecl - Represents an ObjC instance variable.
Definition: DeclObjC.h:1964
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 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:1034
QualType getType() const
Definition: Decl.h:638
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:1788
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: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.
llvm::FunctionType * GetFunctionType(const CGFunctionInfo &Info)
GetFunctionType - Get the LLVM function type for.
Definition: CGCall.cpp:1524