clang  3.8.0
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,
32  const ObjCIvarDecl *Ivar) {
33  const ObjCInterfaceDecl *Container = Ivar->getContainingInterface();
34 
35  // FIXME: We should eliminate the need to have ObjCImplementationDecl passed
36  // in here; it should never be necessary because that should be the lexical
37  // decl context for the ivar.
38 
39  // If we know have an implementation (and the ivar is in it) then
40  // look up in the implementation layout.
41  const ASTRecordLayout *RL;
42  if (ID && declaresSameEntity(ID->getClassInterface(), Container))
44  else
45  RL = &CGM.getContext().getASTObjCInterfaceLayout(Container);
46 
47  // Compute field index.
48  //
49  // FIXME: The index here is closely tied to how ASTContext::getObjCLayout is
50  // implemented. This should be fixed to get the information from the layout
51  // directly.
52  unsigned Index = 0;
53 
54  for (const ObjCIvarDecl *IVD = Container->all_declared_ivar_begin();
55  IVD; IVD = IVD->getNextIvar()) {
56  if (Ivar == IVD)
57  break;
58  ++Index;
59  }
60  assert(Index < RL->getFieldCount() && "Ivar is not inside record layout!");
61 
62  return RL->getFieldOffset(Index);
63 }
64 
66  const ObjCInterfaceDecl *OID,
67  const ObjCIvarDecl *Ivar) {
68  return LookupFieldBitOffset(CGM, OID, nullptr, Ivar) /
69  CGM.getContext().getCharWidth();
70 }
71 
73  const ObjCImplementationDecl *OID,
74  const ObjCIvarDecl *Ivar) {
75  return LookupFieldBitOffset(CGM, OID->getClassInterface(), OID, Ivar) /
76  CGM.getContext().getCharWidth();
77 }
78 
81  const ObjCInterfaceDecl *ID,
82  const ObjCIvarDecl *Ivar) {
83  return LookupFieldBitOffset(CGM, ID, ID->getImplementation(), Ivar);
84 }
85 
87  const ObjCInterfaceDecl *OID,
88  llvm::Value *BaseValue,
89  const ObjCIvarDecl *Ivar,
90  unsigned CVRQualifiers,
92  // Compute (type*) ( (char *) BaseValue + Offset)
93  QualType IvarTy = Ivar->getType();
94  llvm::Type *LTy = CGF.CGM.getTypes().ConvertTypeForMem(IvarTy);
95  llvm::Value *V = CGF.Builder.CreateBitCast(BaseValue, CGF.Int8PtrTy);
96  V = CGF.Builder.CreateInBoundsGEP(V, Offset, "add.ptr");
97 
98  if (!Ivar->isBitField()) {
99  V = CGF.Builder.CreateBitCast(V, llvm::PointerType::getUnqual(LTy));
100  LValue LV = CGF.MakeNaturalAlignAddrLValue(V, IvarTy);
101  LV.getQuals().addCVRQualifiers(CVRQualifiers);
102  return LV;
103  }
104 
105  // We need to compute an access strategy for this bit-field. We are given the
106  // offset to the first byte in the bit-field, the sub-byte offset is taken
107  // from the original layout. We reuse the normal bit-field access strategy by
108  // treating this as an access to a struct where the bit-field is in byte 0,
109  // and adjust the containing type size as appropriate.
110  //
111  // FIXME: Note that currently we make a very conservative estimate of the
112  // alignment of the bit-field, because (a) it is not clear what guarantees the
113  // runtime makes us, and (b) we don't have a way to specify that the struct is
114  // at an alignment plus offset.
115  //
116  // Note, there is a subtle invariant here: we can only call this routine on
117  // non-synthesized ivars but we may be called for synthesized ivars. However,
118  // a synthesized ivar can never be a bit-field, so this is safe.
119  uint64_t FieldBitOffset = LookupFieldBitOffset(CGF.CGM, OID, nullptr, Ivar);
120  uint64_t BitOffset = FieldBitOffset % CGF.CGM.getContext().getCharWidth();
121  uint64_t AlignmentBits = CGF.CGM.getTarget().getCharAlign();
122  uint64_t BitFieldSize = Ivar->getBitWidthValue(CGF.getContext());
123  CharUnits StorageSize =
125  llvm::RoundUpToAlignment(BitOffset + BitFieldSize, AlignmentBits));
126  CharUnits Alignment = CGF.CGM.getContext().toCharUnitsFromBits(AlignmentBits);
127 
128  // Allocate a new CGBitFieldInfo object to describe this access.
129  //
130  // FIXME: This is incredibly wasteful, these should be uniqued or part of some
131  // layout object. However, this is blocked on other cleanups to the
132  // Objective-C code, so for now we just live with allocating a bunch of these
133  // objects.
134  CGBitFieldInfo *Info = new (CGF.CGM.getContext()) CGBitFieldInfo(
135  CGBitFieldInfo::MakeInfo(CGF.CGM.getTypes(), Ivar, BitOffset, BitFieldSize,
136  CGF.CGM.getContext().toBits(StorageSize),
138 
139  Address Addr(V, Alignment);
140  Addr = CGF.Builder.CreateElementBitCast(Addr,
141  llvm::Type::getIntNTy(CGF.getLLVMContext(),
142  Info->StorageSize));
143  return LValue::MakeBitfield(Addr, *Info,
144  IvarTy.withCVRQualifiers(CVRQualifiers),
146 }
147 
148 namespace {
149  struct CatchHandler {
150  const VarDecl *Variable;
151  const Stmt *Body;
152  llvm::BasicBlock *Block;
153  llvm::Constant *TypeInfo;
154  };
155 
156  struct CallObjCEndCatch final : EHScopeStack::Cleanup {
157  CallObjCEndCatch(bool MightThrow, llvm::Value *Fn) :
158  MightThrow(MightThrow), Fn(Fn) {}
159  bool MightThrow;
160  llvm::Value *Fn;
161 
162  void Emit(CodeGenFunction &CGF, Flags flags) override {
163  if (!MightThrow) {
164  CGF.Builder.CreateCall(Fn)->setDoesNotThrow();
165  return;
166  }
167 
168  CGF.EmitRuntimeCallOrInvoke(Fn);
169  }
170  };
171 }
172 
173 
175  const ObjCAtTryStmt &S,
176  llvm::Constant *beginCatchFn,
177  llvm::Constant *endCatchFn,
178  llvm::Constant *exceptionRethrowFn) {
179  // Jump destination for falling out of catch bodies.
181  if (S.getNumCatchStmts())
182  Cont = CGF.getJumpDestInCurrentScope("eh.cont");
183 
184  CodeGenFunction::FinallyInfo FinallyInfo;
185  if (const ObjCAtFinallyStmt *Finally = S.getFinallyStmt())
186  FinallyInfo.enter(CGF, Finally->getFinallyBody(),
187  beginCatchFn, endCatchFn, exceptionRethrowFn);
188 
190 
191  // Enter the catch, if there is one.
192  if (S.getNumCatchStmts()) {
193  for (unsigned I = 0, N = S.getNumCatchStmts(); I != N; ++I) {
194  const ObjCAtCatchStmt *CatchStmt = S.getCatchStmt(I);
195  const VarDecl *CatchDecl = CatchStmt->getCatchParamDecl();
196 
197  Handlers.push_back(CatchHandler());
198  CatchHandler &Handler = Handlers.back();
199  Handler.Variable = CatchDecl;
200  Handler.Body = CatchStmt->getCatchBody();
201  Handler.Block = CGF.createBasicBlock("catch");
202 
203  // @catch(...) always matches.
204  if (!CatchDecl) {
205  Handler.TypeInfo = nullptr; // catch-all
206  // Don't consider any other catches.
207  break;
208  }
209 
210  Handler.TypeInfo = GetEHType(CatchDecl->getType());
211  }
212 
213  EHCatchScope *Catch = CGF.EHStack.pushCatch(Handlers.size());
214  for (unsigned I = 0, E = Handlers.size(); I != E; ++I)
215  Catch->setHandler(I, Handlers[I].TypeInfo, Handlers[I].Block);
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::Value *RawExn = CGF.getExceptionFromSlot();
234 
235  // Enter the catch.
236  llvm::Value *Exn = RawExn;
237  if (beginCatchFn) {
238  Exn = CGF.Builder.CreateCall(beginCatchFn, RawExn, "exn.adjusted");
239  cast<llvm::CallInst>(Exn)->setDoesNotThrow();
240  }
241 
242  CodeGenFunction::LexicalScope cleanups(CGF, Handler.Body->getSourceRange());
243 
244  if (endCatchFn) {
245  // Add a cleanup to leave the catch.
246  bool EndCatchMightThrow = (Handler.Variable == nullptr);
247 
248  CGF.EHStack.pushCleanup<CallObjCEndCatch>(NormalAndEHCleanup,
249  EndCatchMightThrow,
250  endCatchFn);
251  }
252 
253  // Bind the catch parameter if it exists.
254  if (const VarDecl *CatchParam = Handler.Variable) {
255  llvm::Type *CatchType = CGF.ConvertType(CatchParam->getType());
256  llvm::Value *CastExn = CGF.Builder.CreateBitCast(Exn, CatchType);
257 
258  CGF.EmitAutoVarDecl(*CatchParam);
259  EmitInitOfCatchParam(CGF, CastExn, CatchParam);
260  }
261 
262  CGF.ObjCEHValueStack.push_back(Exn);
263  CGF.EmitStmt(Handler.Body);
264  CGF.ObjCEHValueStack.pop_back();
265 
266  // Leave any cleanups associated with the catch.
267  cleanups.ForceCleanup();
268 
269  CGF.EmitBranchThroughCleanup(Cont);
270  }
271 
272  // Go back to the try-statement fallthrough.
273  CGF.Builder.restoreIP(SavedIP);
274 
275  // Pop out of the finally.
276  if (S.getFinallyStmt())
277  FinallyInfo.exit(CGF);
278 
279  if (Cont.isValid())
280  CGF.EmitBlock(Cont.getBlock());
281 }
282 
284  llvm::Value *exn,
285  const VarDecl *paramDecl) {
286 
287  Address paramAddr = CGF.GetAddrOfLocalVar(paramDecl);
288 
289  switch (paramDecl->getType().getQualifiers().getObjCLifetime()) {
291  exn = CGF.EmitARCRetainNonBlock(exn);
292  // fallthrough
293 
297  CGF.Builder.CreateStore(exn, paramAddr);
298  return;
299 
301  CGF.EmitARCInitWeak(paramAddr, exn);
302  return;
303  }
304  llvm_unreachable("invalid ownership qualifier");
305 }
306 
307 namespace {
308  struct CallSyncExit final : EHScopeStack::Cleanup {
309  llvm::Value *SyncExitFn;
310  llvm::Value *SyncArg;
311  CallSyncExit(llvm::Value *SyncExitFn, llvm::Value *SyncArg)
312  : SyncExitFn(SyncExitFn), SyncArg(SyncArg) {}
313 
314  void Emit(CodeGenFunction &CGF, Flags flags) override {
315  CGF.Builder.CreateCall(SyncExitFn, SyncArg)->setDoesNotThrow();
316  }
317  };
318 }
319 
321  const ObjCAtSynchronizedStmt &S,
322  llvm::Function *syncEnterFn,
323  llvm::Function *syncExitFn) {
324  CodeGenFunction::RunCleanupsScope cleanups(CGF);
325 
326  // Evaluate the lock operand. This is guaranteed to dominate the
327  // ARC release and lock-release cleanups.
328  const Expr *lockExpr = S.getSynchExpr();
329  llvm::Value *lock;
330  if (CGF.getLangOpts().ObjCAutoRefCount) {
331  lock = CGF.EmitARCRetainScalarExpr(lockExpr);
332  lock = CGF.EmitObjCConsumeObject(lockExpr->getType(), lock);
333  } else {
334  lock = CGF.EmitScalarExpr(lockExpr);
335  }
336  lock = CGF.Builder.CreateBitCast(lock, CGF.VoidPtrTy);
337 
338  // Acquire the lock.
339  CGF.Builder.CreateCall(syncEnterFn, lock)->setDoesNotThrow();
340 
341  // Register an all-paths cleanup to release the lock.
342  CGF.EHStack.pushCleanup<CallSyncExit>(NormalAndEHCleanup, syncExitFn, lock);
343 
344  // Emit the body of the statement.
345  CGF.EmitStmt(S.getSynchBody());
346 }
347 
348 /// Compute the pointer-to-function type to which a message send
349 /// should be casted in order to correctly call the given method
350 /// with the given arguments.
351 ///
352 /// \param method - may be null
353 /// \param resultType - the result type to use if there's no method
354 /// \param callArgs - the actual arguments, including implicit ones
357  QualType resultType,
358  CallArgList &callArgs) {
359  // If there's a method, use information from that.
360  if (method) {
361  const CGFunctionInfo &signature =
362  CGM.getTypes().arrangeObjCMessageSendSignature(method, callArgs[0].Ty);
363 
364  llvm::PointerType *signatureType =
365  CGM.getTypes().GetFunctionType(signature)->getPointerTo();
366 
367  // If that's not variadic, there's no need to recompute the ABI
368  // arrangement.
369  if (!signature.isVariadic())
370  return MessageSendInfo(signature, signatureType);
371 
372  // Otherwise, there is.
373  FunctionType::ExtInfo einfo = signature.getExtInfo();
374  const CGFunctionInfo &argsInfo =
375  CGM.getTypes().arrangeFreeFunctionCall(resultType, callArgs, einfo,
376  signature.getRequiredArgs());
377 
378  return MessageSendInfo(argsInfo, signatureType);
379  }
380 
381  // There's no method; just use a default CC.
382  const CGFunctionInfo &argsInfo =
383  CGM.getTypes().arrangeFreeFunctionCall(resultType, callArgs,
386 
387  // Derive the signature to call from that.
388  llvm::PointerType *signatureType =
389  CGM.getTypes().GetFunctionType(argsInfo)->getPointerTo();
390  return MessageSendInfo(argsInfo, signatureType);
391 }
const ObjCAtFinallyStmt * getFinallyStmt() const
Retrieve the @finally statement, if any.
Definition: StmtObjC.h:224
A (possibly-)qualified type.
Definition: Type.h:575
bool isBitField() const
Determines whether this field is a bitfield.
Definition: Decl.h:2277
static LValue MakeBitfield(Address Addr, const CGBitFieldInfo &Info, QualType type, AlignmentSource alignSource)
Create a new object to represent a bit-field access.
Definition: CGValue.h:414
void EmitAutoVarDecl(const VarDecl &D)
EmitAutoVarDecl - Emit an auto variable declaration.
Definition: CGDecl.cpp:904
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:1948
const ASTRecordLayout & getASTObjCImplementationLayout(const ObjCImplementationDecl *D) const
Get or compute information about the layout of the specified Objective-C implementation.
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:699
uint64_t ComputeIvarBaseOffset(CodeGen::CodeGenModule &CGM, const ObjCInterfaceDecl *OID, const ObjCIvarDecl *Ivar)
Compute an offset to the given ivar, suitable for passing to EmitValueForIvarAtOffset.
ObjCLifetime getObjCLifetime() const
Definition: Type.h:290
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:153
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...
const ObjCInterfaceDecl * getContainingInterface() const
Return the class interface that this ivar is logically contained in; this is either the interface whe...
Definition: DeclObjC.cpp:1685
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:235
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:176
CharUnits - This is an opaque type for sizes expressed in character units.
Definition: CharUnits.h:38
const Qualifiers & getQuals() const
Definition: CGValue.h:311
uint32_t Offset
Definition: CacheTokens.cpp:44
static uint64_t LookupFieldBitOffset(CodeGen::CodeGenModule &CGM, const ObjCInterfaceDecl *OID, const ObjCImplementationDecl *ID, const ObjCIvarDecl *Ivar)
void addCVRQualifiers(unsigned mask)
Definition: Type.h:263
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:325
bool declaresSameEntity(const Decl *D1, const Decl *D2)
Determine whether two declarations declare the same entity.
Definition: DeclBase.h:1026
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.
uint64_t getFieldOffset(unsigned FieldNo) const
getFieldOffset - Get the offset of the given field index, in bits.
Definition: RecordLayout.h:181
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:2743
const ObjCAtCatchStmt * getCatchStmt(unsigned I) const
Retrieve a @catch statement.
Definition: StmtObjC.h:206
Represents an ObjC class declaration.
Definition: DeclObjC.h:853
detail::InMemoryDirectory::const_iterator I
QualType getType() const
Definition: Decl.h:530
This object can be modified without requiring retains or releases.
Definition: Type.h:137
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:3111
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...
const TargetInfo & getTarget() const
ID
Defines the set of possible language-specific address spaces.
Definition: AddressSpaces.h:27
ASTRecordLayout - This class contains layout information for one RecordDecl, which is a struct/union/...
Definition: RecordLayout.h:34
Expr - This represents one expression.
Definition: Expr.h:104
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:133
Address CreateBitCast(Address Addr, llvm::Type *Ty, const llvm::Twine &Name="")
Definition: CGBuilder.h:168
Assigning into this object requires the old value to be released and the new value to be retained...
Definition: Type.h:144
FunctionType::ExtInfo getExtInfo() const
ASTContext & getContext() const
RequiredArgs getRequiredArgs() const
QualType withCVRQualifiers(unsigned CVR) const
Definition: Type.h:761
unsigned getBitWidthValue(const ASTContext &Ctx) const
Definition: Decl.cpp:3463
SmallVector< llvm::Value *, 8 > ObjCEHValueStack
ObjCEHValueStack - Stack of Objective-C exception values, used for rethrows.
const ObjCInterfaceDecl * getClassInterface() const
Definition: DeclObjC.h:2085
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:150
llvm::Value * EmitScalarExpr(const Expr *E, bool IgnoreResultAssign=false)
EmitScalarExpr - Emit the computation of the specified expression of LLVM scalar type, returning the result.
ObjCIvarDecl * getNextIvar()
Definition: DeclObjC.h:1642
QualType getType() const
Definition: Expr.h:125
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
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:121
ObjCImplementationDecl - Represents a class definition - this is where method definitions are specifi...
Definition: DeclObjC.h:2220
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:1797
ObjCImplementationDecl * getImplementation() const
Definition: DeclObjC.cpp:1447
void EmitBlock(llvm::BasicBlock *BB, bool IsFinished=false)
EmitBlock - Emit the given block.
Definition: CGStmt.cpp:367
void EmitARCInitWeak(Address addr, llvm::Value *value)
i8* @objc_initWeak(i8** addr, i8* value) Returns value.
Definition: CGObjC.cpp:2226
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:147
llvm::Type * ConvertType(QualType T)
ObjCIvarDecl - Represents an ObjC instance variable.
Definition: DeclObjC.h:1609
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)
const CGFunctionInfo & arrangeFreeFunctionCall(const CallArgList &Args, const FunctionType *Ty, bool ChainCall)
Figure out the rules for calling a function with the given formal type using the given arguments...
Definition: CGCall.cpp:444
void EmitBranchThroughCleanup(JumpDest Dest)
EmitBranchThroughCleanup - Emit a branch from the current insert block through the normal cleanup han...
Definition: CGCleanup.cpp:980
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:152
Information for lazily generating a cleanup.
Definition: EHScopeStack.h:144
ObjCIvarDecl * all_declared_ivar_begin()
all_declared_ivar_begin - return first ivar declared in this class, its extensions and its implementa...
Definition: DeclObjC.cpp:1487
llvm::Value * EmitObjCConsumeObject(QualType T, llvm::Value *Ptr)
Produce the code for a CK_ARCConsumeObject.
Definition: CGObjC.cpp:1776
const ASTRecordLayout & getASTObjCInterfaceLayout(const ObjCInterfaceDecl *D) const
Get or compute information about the layout of the specified Objective-C interface.
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:56
void setHandler(unsigned I, llvm::Constant *Type, llvm::BasicBlock *Block)
Definition: CGCleanup.h:201
A class which abstracts out some details necessary for making a call.
Definition: Type.h:2872
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:5116
llvm::FunctionType * GetFunctionType(const CGFunctionInfo &Info)
GetFunctionType - Get the LLVM function type for.
Definition: CGCall.cpp:1293