Anders Carlsson | 756b5c4 | 2009-10-30 01:42:31 +0000 | [diff] [blame] | 1 | //===--- CGException.cpp - Emit LLVM Code for C++ exceptions --------------===// |
| 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 contains code dealing with C++ exception related code generation. |
| 11 | // |
| 12 | //===----------------------------------------------------------------------===// |
| 13 | |
Mike Stump | 2bf701e | 2009-11-20 23:44:51 +0000 | [diff] [blame] | 14 | #include "clang/AST/StmtCXX.h" |
| 15 | |
| 16 | #include "llvm/Intrinsics.h" |
| 17 | |
Anders Carlsson | 756b5c4 | 2009-10-30 01:42:31 +0000 | [diff] [blame] | 18 | #include "CodeGenFunction.h" |
| 19 | using namespace clang; |
| 20 | using namespace CodeGen; |
| 21 | |
Anders Carlsson | d337929 | 2009-10-30 02:27:02 +0000 | [diff] [blame] | 22 | static llvm::Constant *getAllocateExceptionFn(CodeGenFunction &CGF) { |
| 23 | // void *__cxa_allocate_exception(size_t thrown_size); |
| 24 | const llvm::Type *SizeTy = CGF.ConvertType(CGF.getContext().getSizeType()); |
| 25 | std::vector<const llvm::Type*> Args(1, SizeTy); |
| 26 | |
| 27 | const llvm::FunctionType *FTy = |
| 28 | llvm::FunctionType::get(llvm::Type::getInt8PtrTy(CGF.getLLVMContext()), |
| 29 | Args, false); |
| 30 | |
| 31 | return CGF.CGM.CreateRuntimeFunction(FTy, "__cxa_allocate_exception"); |
| 32 | } |
| 33 | |
| 34 | static llvm::Constant *getThrowFn(CodeGenFunction &CGF) { |
| 35 | // void __cxa_throw (void *thrown_exception, std::type_info *tinfo, |
| 36 | // void (*dest) (void *) ); |
| 37 | |
| 38 | const llvm::Type *Int8PtrTy = llvm::Type::getInt8PtrTy(CGF.getLLVMContext()); |
| 39 | std::vector<const llvm::Type*> Args(3, Int8PtrTy); |
| 40 | |
| 41 | const llvm::FunctionType *FTy = |
Mike Stump | b4eea69 | 2009-11-20 00:56:31 +0000 | [diff] [blame] | 42 | llvm::FunctionType::get(llvm::Type::getVoidTy(CGF.getLLVMContext()), |
| 43 | Args, false); |
Anders Carlsson | d337929 | 2009-10-30 02:27:02 +0000 | [diff] [blame] | 44 | |
| 45 | return CGF.CGM.CreateRuntimeFunction(FTy, "__cxa_throw"); |
| 46 | } |
| 47 | |
Mike Stump | b4eea69 | 2009-11-20 00:56:31 +0000 | [diff] [blame] | 48 | static llvm::Constant *getReThrowFn(CodeGenFunction &CGF) { |
| 49 | // void __cxa_rethrow (); |
| 50 | |
| 51 | const llvm::FunctionType *FTy = |
| 52 | llvm::FunctionType::get(llvm::Type::getVoidTy(CGF.getLLVMContext()), false); |
| 53 | |
| 54 | return CGF.CGM.CreateRuntimeFunction(FTy, "__cxa_rethrow"); |
| 55 | } |
| 56 | |
Mike Stump | 2bf701e | 2009-11-20 23:44:51 +0000 | [diff] [blame] | 57 | static llvm::Constant *getBeginCatchFn(CodeGenFunction &CGF) { |
Mike Stump | 0f590be | 2009-12-01 03:41:18 +0000 | [diff] [blame] | 58 | // void* __cxa_begin_catch (); |
Mike Stump | 2bf701e | 2009-11-20 23:44:51 +0000 | [diff] [blame] | 59 | |
| 60 | const llvm::Type *Int8PtrTy = llvm::Type::getInt8PtrTy(CGF.getLLVMContext()); |
| 61 | std::vector<const llvm::Type*> Args(1, Int8PtrTy); |
| 62 | |
| 63 | const llvm::FunctionType *FTy = |
Mike Stump | 0f590be | 2009-12-01 03:41:18 +0000 | [diff] [blame] | 64 | llvm::FunctionType::get(Int8PtrTy, Args, false); |
Mike Stump | 2bf701e | 2009-11-20 23:44:51 +0000 | [diff] [blame] | 65 | |
| 66 | return CGF.CGM.CreateRuntimeFunction(FTy, "__cxa_begin_catch"); |
| 67 | } |
| 68 | |
| 69 | static llvm::Constant *getEndCatchFn(CodeGenFunction &CGF) { |
| 70 | // void __cxa_end_catch (); |
| 71 | |
| 72 | const llvm::FunctionType *FTy = |
| 73 | llvm::FunctionType::get(llvm::Type::getVoidTy(CGF.getLLVMContext()), false); |
| 74 | |
| 75 | return CGF.CGM.CreateRuntimeFunction(FTy, "__cxa_end_catch"); |
| 76 | } |
| 77 | |
Mike Stump | 0f590be | 2009-12-01 03:41:18 +0000 | [diff] [blame] | 78 | // FIXME: Eventually this will all go into the backend. Set from the target for |
| 79 | // now. |
| 80 | static int using_sjlj_exceptions = 0; |
| 81 | |
| 82 | static llvm::Constant *getUnwindResumeOrRethrowFn(CodeGenFunction &CGF) { |
| 83 | const llvm::Type *Int8PtrTy = llvm::Type::getInt8PtrTy(CGF.getLLVMContext()); |
| 84 | std::vector<const llvm::Type*> Args(1, Int8PtrTy); |
| 85 | |
| 86 | const llvm::FunctionType *FTy = |
| 87 | llvm::FunctionType::get(llvm::Type::getVoidTy(CGF.getLLVMContext()), Args, |
| 88 | false); |
| 89 | |
| 90 | if (using_sjlj_exceptions) |
| 91 | return CGF.CGM.CreateRuntimeFunction(FTy, "_Unwind_SjLj_Resume"); |
| 92 | return CGF.CGM.CreateRuntimeFunction(FTy, "_Unwind_Resume_or_Rethrow"); |
| 93 | } |
| 94 | |
| 95 | // CopyObject - Utility to copy an object. Calls copy constructor as necessary. |
| 96 | // N is casted to the right type. |
| 97 | static void CopyObject(CodeGenFunction &CGF, const Expr *E, llvm::Value *N) { |
| 98 | QualType ObjectType = E->getType(); |
| 99 | |
| 100 | // Store the throw exception in the exception object. |
| 101 | if (!CGF.hasAggregateLLVMType(ObjectType)) { |
| 102 | llvm::Value *Value = CGF.EmitScalarExpr(E); |
| 103 | const llvm::Type *ValuePtrTy = Value->getType()->getPointerTo(0); |
| 104 | |
| 105 | CGF.Builder.CreateStore(Value, CGF.Builder.CreateBitCast(N, ValuePtrTy)); |
| 106 | } else { |
| 107 | const llvm::Type *Ty = CGF.ConvertType(ObjectType)->getPointerTo(0); |
| 108 | const CXXRecordDecl *RD; |
| 109 | RD = cast<CXXRecordDecl>(ObjectType->getAs<RecordType>()->getDecl()); |
| 110 | llvm::Value *This = CGF.Builder.CreateBitCast(N, Ty); |
| 111 | if (RD->hasTrivialCopyConstructor()) { |
| 112 | CGF.EmitAggExpr(E, This, false); |
| 113 | } else if (CXXConstructorDecl *CopyCtor |
| 114 | = RD->getCopyConstructor(CGF.getContext(), 0)) { |
| 115 | // FIXME: region management |
| 116 | llvm::Value *Src = CGF.EmitLValue(E).getAddress(); |
| 117 | |
| 118 | // Stolen from EmitClassAggrMemberwiseCopy |
| 119 | llvm::Value *Callee = CGF.CGM.GetAddrOfCXXConstructor(CopyCtor, |
| 120 | Ctor_Complete); |
| 121 | CallArgList CallArgs; |
| 122 | CallArgs.push_back(std::make_pair(RValue::get(This), |
| 123 | CopyCtor->getThisType(CGF.getContext()))); |
| 124 | |
| 125 | // Push the Src ptr. |
| 126 | CallArgs.push_back(std::make_pair(RValue::get(Src), |
| 127 | CopyCtor->getParamDecl(0)->getType())); |
| 128 | QualType ResultType = |
| 129 | CopyCtor->getType()->getAs<FunctionType>()->getResultType(); |
| 130 | CGF.EmitCall(CGF.CGM.getTypes().getFunctionInfo(ResultType, CallArgs), |
| 131 | Callee, CallArgs, CopyCtor); |
| 132 | // FIXME: region management |
| 133 | } else |
| 134 | CGF.ErrorUnsupported(E, "uncopyable object"); |
| 135 | } |
| 136 | } |
| 137 | |
| 138 | // CopyObject - Utility to copy an object. Calls copy constructor as necessary. |
| 139 | // N is casted to the right type. |
| 140 | static void CopyObject(CodeGenFunction &CGF, QualType ObjectType, |
| 141 | llvm::Value *E, llvm::Value *N) { |
| 142 | // Store the throw exception in the exception object. |
| 143 | if (!CGF.hasAggregateLLVMType(ObjectType)) { |
| 144 | llvm::Value *Value = E; |
| 145 | const llvm::Type *ValuePtrTy = Value->getType()->getPointerTo(0); |
| 146 | |
| 147 | CGF.Builder.CreateStore(Value, CGF.Builder.CreateBitCast(N, ValuePtrTy)); |
| 148 | } else { |
| 149 | const llvm::Type *Ty = CGF.ConvertType(ObjectType)->getPointerTo(0); |
| 150 | const CXXRecordDecl *RD; |
| 151 | RD = cast<CXXRecordDecl>(ObjectType->getAs<RecordType>()->getDecl()); |
| 152 | llvm::Value *This = CGF.Builder.CreateBitCast(N, Ty); |
| 153 | if (RD->hasTrivialCopyConstructor()) { |
| 154 | CGF.EmitAggregateCopy(This, E, ObjectType); |
| 155 | } else if (CXXConstructorDecl *CopyCtor |
| 156 | = RD->getCopyConstructor(CGF.getContext(), 0)) { |
| 157 | // FIXME: region management |
| 158 | llvm::Value *Src = E; |
| 159 | |
| 160 | // Stolen from EmitClassAggrMemberwiseCopy |
| 161 | llvm::Value *Callee = CGF.CGM.GetAddrOfCXXConstructor(CopyCtor, |
| 162 | Ctor_Complete); |
| 163 | CallArgList CallArgs; |
| 164 | CallArgs.push_back(std::make_pair(RValue::get(This), |
| 165 | CopyCtor->getThisType(CGF.getContext()))); |
| 166 | |
| 167 | // Push the Src ptr. |
| 168 | CallArgs.push_back(std::make_pair(RValue::get(Src), |
| 169 | CopyCtor->getParamDecl(0)->getType())); |
| 170 | QualType ResultType = |
| 171 | CopyCtor->getType()->getAs<FunctionType>()->getResultType(); |
| 172 | CGF.EmitCall(CGF.CGM.getTypes().getFunctionInfo(ResultType, CallArgs), |
| 173 | Callee, CallArgs, CopyCtor); |
| 174 | // FIXME: region management |
| 175 | } else |
| 176 | llvm::llvm_unreachable("uncopyable object"); |
| 177 | } |
| 178 | } |
| 179 | |
Anders Carlsson | 756b5c4 | 2009-10-30 01:42:31 +0000 | [diff] [blame] | 180 | void CodeGenFunction::EmitCXXThrowExpr(const CXXThrowExpr *E) { |
Anders Carlsson | d337929 | 2009-10-30 02:27:02 +0000 | [diff] [blame] | 181 | if (!E->getSubExpr()) { |
Mike Stump | b4eea69 | 2009-11-20 00:56:31 +0000 | [diff] [blame] | 182 | Builder.CreateCall(getReThrowFn(*this))->setDoesNotReturn(); |
| 183 | Builder.CreateUnreachable(); |
| 184 | |
| 185 | // Clear the insertion point to indicate we are in unreachable code. |
| 186 | Builder.ClearInsertionPoint(); |
Anders Carlsson | d337929 | 2009-10-30 02:27:02 +0000 | [diff] [blame] | 187 | return; |
| 188 | } |
| 189 | |
| 190 | QualType ThrowType = E->getSubExpr()->getType(); |
Anders Carlsson | d337929 | 2009-10-30 02:27:02 +0000 | [diff] [blame] | 191 | // FIXME: Handle cleanup. |
| 192 | if (!CleanupEntries.empty()){ |
Mike Stump | 2bf701e | 2009-11-20 23:44:51 +0000 | [diff] [blame] | 193 | ErrorUnsupported(E, "throw expression with cleanup entries"); |
Anders Carlsson | d337929 | 2009-10-30 02:27:02 +0000 | [diff] [blame] | 194 | return; |
| 195 | } |
| 196 | |
| 197 | // Now allocate the exception object. |
| 198 | const llvm::Type *SizeTy = ConvertType(getContext().getSizeType()); |
| 199 | uint64_t TypeSize = getContext().getTypeSize(ThrowType) / 8; |
| 200 | |
| 201 | llvm::Constant *AllocExceptionFn = getAllocateExceptionFn(*this); |
| 202 | llvm::Value *ExceptionPtr = |
| 203 | Builder.CreateCall(AllocExceptionFn, |
| 204 | llvm::ConstantInt::get(SizeTy, TypeSize), |
| 205 | "exception"); |
| 206 | |
Mike Stump | 0f590be | 2009-12-01 03:41:18 +0000 | [diff] [blame] | 207 | CopyObject(*this, E->getSubExpr(), ExceptionPtr); |
Anders Carlsson | d337929 | 2009-10-30 02:27:02 +0000 | [diff] [blame] | 208 | |
| 209 | // Now throw the exception. |
| 210 | const llvm::Type *Int8PtrTy = llvm::Type::getInt8PtrTy(getLLVMContext()); |
Mike Stump | 23886d0 | 2009-11-20 00:43:57 +0000 | [diff] [blame] | 211 | llvm::Constant *TypeInfo = CGM.GenerateRtti(ThrowType); |
Anders Carlsson | d337929 | 2009-10-30 02:27:02 +0000 | [diff] [blame] | 212 | llvm::Constant *Dtor = llvm::Constant::getNullValue(Int8PtrTy); |
| 213 | |
| 214 | llvm::CallInst *ThrowCall = |
| 215 | Builder.CreateCall3(getThrowFn(*this), ExceptionPtr, TypeInfo, Dtor); |
| 216 | ThrowCall->setDoesNotReturn(); |
| 217 | Builder.CreateUnreachable(); |
| 218 | |
| 219 | // Clear the insertion point to indicate we are in unreachable code. |
| 220 | Builder.ClearInsertionPoint(); |
Anders Carlsson | 756b5c4 | 2009-10-30 01:42:31 +0000 | [diff] [blame] | 221 | } |
Mike Stump | 2bf701e | 2009-11-20 23:44:51 +0000 | [diff] [blame] | 222 | |
| 223 | void CodeGenFunction::EmitCXXTryStmt(const CXXTryStmt &S) { |
Mike Stump | 0f590be | 2009-12-01 03:41:18 +0000 | [diff] [blame] | 224 | #if 1 |
Mike Stump | 2bf701e | 2009-11-20 23:44:51 +0000 | [diff] [blame] | 225 | EmitStmt(S.getTryBlock()); |
Mike Stump | 0f590be | 2009-12-01 03:41:18 +0000 | [diff] [blame] | 226 | if (0) { |
| 227 | getBeginCatchFn(*this); |
| 228 | getEndCatchFn(*this); |
| 229 | getUnwindResumeOrRethrowFn(*this); |
| 230 | CopyObject(*this, QualType(), 0, 0); |
| 231 | } |
| 232 | #else |
| 233 | // FIXME: The below is still just a sketch of the code we need. |
Mike Stump | 2bf701e | 2009-11-20 23:44:51 +0000 | [diff] [blame] | 234 | // Pointer to the personality function |
| 235 | llvm::Constant *Personality = |
| 236 | CGM.CreateRuntimeFunction(llvm::FunctionType::get(llvm::Type::getInt32Ty |
| 237 | (VMContext), |
| 238 | true), |
| 239 | "__gxx_personality_v0"); |
| 240 | Personality = llvm::ConstantExpr::getBitCast(Personality, PtrToInt8Ty); |
| 241 | |
Mike Stump | 2bf701e | 2009-11-20 23:44:51 +0000 | [diff] [blame] | 242 | llvm::BasicBlock *PrevLandingPad = getInvokeDest(); |
| 243 | llvm::BasicBlock *TryHandler = createBasicBlock("try.handler"); |
Mike Stump | 0f590be | 2009-12-01 03:41:18 +0000 | [diff] [blame] | 244 | #if 0 |
Mike Stump | 2bf701e | 2009-11-20 23:44:51 +0000 | [diff] [blame] | 245 | llvm::BasicBlock *FinallyBlock = createBasicBlock("finally"); |
Mike Stump | 0f590be | 2009-12-01 03:41:18 +0000 | [diff] [blame] | 246 | #endif |
| 247 | llvm::BasicBlock *FinallyRethrow = createBasicBlock("finally.throw"); |
Mike Stump | 2bf701e | 2009-11-20 23:44:51 +0000 | [diff] [blame] | 248 | llvm::BasicBlock *FinallyEnd = createBasicBlock("finally.end"); |
| 249 | |
Mike Stump | 0f590be | 2009-12-01 03:41:18 +0000 | [diff] [blame] | 250 | #if 0 |
Mike Stump | 2bf701e | 2009-11-20 23:44:51 +0000 | [diff] [blame] | 251 | // Push an EH context entry, used for handling rethrows. |
| 252 | PushCleanupBlock(FinallyBlock); |
Mike Stump | 0f590be | 2009-12-01 03:41:18 +0000 | [diff] [blame] | 253 | #endif |
Mike Stump | 2bf701e | 2009-11-20 23:44:51 +0000 | [diff] [blame] | 254 | |
| 255 | // Emit the statements in the try {} block |
| 256 | setInvokeDest(TryHandler); |
| 257 | |
| 258 | EmitStmt(S.getTryBlock()); |
| 259 | |
| 260 | // Jump to end if there is no exception |
| 261 | EmitBranchThroughCleanup(FinallyEnd); |
| 262 | |
| 263 | // Emit the handlers |
| 264 | EmitBlock(TryHandler); |
| 265 | |
| 266 | const llvm::IntegerType *Int8Ty; |
| 267 | const llvm::PointerType *PtrToInt8Ty; |
| 268 | Int8Ty = llvm::Type::getInt8Ty(VMContext); |
| 269 | // C string type. Used in lots of places. |
| 270 | PtrToInt8Ty = llvm::PointerType::getUnqual(Int8Ty); |
Mike Stump | 0f590be | 2009-12-01 03:41:18 +0000 | [diff] [blame] | 271 | llvm::Constant *Null = llvm::ConstantPointerNull::get(PtrToInt8Ty); |
| 272 | llvm::SmallVector<llvm::Value*, 8> SelectorArgs; |
Mike Stump | 2bf701e | 2009-11-20 23:44:51 +0000 | [diff] [blame] | 273 | llvm::Value *llvm_eh_exception = |
| 274 | CGM.getIntrinsic(llvm::Intrinsic::eh_exception); |
| 275 | llvm::Value *llvm_eh_selector = |
| 276 | CGM.getIntrinsic(llvm::Intrinsic::eh_selector); |
Mike Stump | 0f590be | 2009-12-01 03:41:18 +0000 | [diff] [blame] | 277 | llvm::Value *llvm_eh_typeid_for = |
| 278 | CGM.getIntrinsic(llvm::Intrinsic::eh_typeid_for); |
Mike Stump | 2bf701e | 2009-11-20 23:44:51 +0000 | [diff] [blame] | 279 | // Exception object |
| 280 | llvm::Value *Exc = Builder.CreateCall(llvm_eh_exception, "exc"); |
Mike Stump | 0f590be | 2009-12-01 03:41:18 +0000 | [diff] [blame] | 281 | llvm::Value *RethrowPtr = CreateTempAlloca(Exc->getType(), "_rethrow"); |
Mike Stump | 2bf701e | 2009-11-20 23:44:51 +0000 | [diff] [blame] | 282 | |
Mike Stump | 0f590be | 2009-12-01 03:41:18 +0000 | [diff] [blame] | 283 | SelectorArgs.push_back(Exc); |
| 284 | SelectorArgs.push_back(Personality); |
Mike Stump | 2bf701e | 2009-11-20 23:44:51 +0000 | [diff] [blame] | 285 | |
Mike Stump | 0f590be | 2009-12-01 03:41:18 +0000 | [diff] [blame] | 286 | bool HasCatchAll = false; |
Mike Stump | 2bf701e | 2009-11-20 23:44:51 +0000 | [diff] [blame] | 287 | for (unsigned i = 0; i<S.getNumHandlers(); ++i) { |
| 288 | const CXXCatchStmt *C = S.getHandler(i); |
Mike Stump | 0f590be | 2009-12-01 03:41:18 +0000 | [diff] [blame] | 289 | VarDecl *CatchParam = C->getExceptionDecl(); |
| 290 | if (CatchParam) { |
| 291 | llvm::Value *EHType = CGM.GenerateRtti(C->getCaughtType().getNonReferenceType()); |
| 292 | SelectorArgs.push_back(EHType); |
Mike Stump | 2bf701e | 2009-11-20 23:44:51 +0000 | [diff] [blame] | 293 | } else { |
| 294 | // null indicates catch all |
Mike Stump | 0f590be | 2009-12-01 03:41:18 +0000 | [diff] [blame] | 295 | SelectorArgs.push_back(Null); |
| 296 | HasCatchAll = true; |
Mike Stump | 2bf701e | 2009-11-20 23:44:51 +0000 | [diff] [blame] | 297 | } |
| 298 | } |
| 299 | |
Mike Stump | 0f590be | 2009-12-01 03:41:18 +0000 | [diff] [blame] | 300 | // We use a cleanup unless there was already a catch all. |
| 301 | if (!HasCatchAll) { |
| 302 | SelectorArgs.push_back(Null); |
| 303 | } |
Mike Stump | 2bf701e | 2009-11-20 23:44:51 +0000 | [diff] [blame] | 304 | |
Mike Stump | 0f590be | 2009-12-01 03:41:18 +0000 | [diff] [blame] | 305 | // Find which handler was matched. |
| 306 | llvm::Value *Selector |
| 307 | = Builder.CreateCall(llvm_eh_selector, SelectorArgs.begin(), |
| 308 | SelectorArgs.end(), "selector"); |
Mike Stump | 2bf701e | 2009-11-20 23:44:51 +0000 | [diff] [blame] | 309 | for (unsigned i = 0; i<S.getNumHandlers(); ++i) { |
| 310 | const CXXCatchStmt *C = S.getHandler(i); |
Mike Stump | 0f590be | 2009-12-01 03:41:18 +0000 | [diff] [blame] | 311 | VarDecl *CatchParam = C->getExceptionDecl(); |
| 312 | Stmt *CatchBody = C->getHandlerBlock(); |
| 313 | |
| 314 | llvm::BasicBlock *Next = 0; |
| 315 | |
| 316 | if (SelectorArgs[i+2] != Null) { |
| 317 | llvm::BasicBlock *Match = createBasicBlock("match"); |
| 318 | Next = createBasicBlock("catch.next"); |
| 319 | const llvm::Type *Int8PtrTy = llvm::Type::getInt8PtrTy(getLLVMContext()); |
| 320 | llvm::Value *Id |
| 321 | = Builder.CreateCall(llvm_eh_typeid_for, |
| 322 | Builder.CreateBitCast(SelectorArgs[i+2], |
| 323 | Int8PtrTy)); |
| 324 | Builder.CreateCondBr(Builder.CreateICmpEQ(Selector, Id), |
| 325 | Match, Next); |
| 326 | EmitBlock(Match); |
| 327 | } |
| 328 | |
| 329 | llvm::BasicBlock *MatchEnd = createBasicBlock("match.end"); |
| 330 | llvm::BasicBlock *MatchHandler = createBasicBlock("match.handler"); |
| 331 | |
| 332 | PushCleanupBlock(MatchEnd); |
| 333 | setInvokeDest(MatchHandler); |
| 334 | |
| 335 | llvm::Value *ExcObject = Builder.CreateCall(getBeginCatchFn(*this), Exc); |
| 336 | |
| 337 | // Bind the catch parameter if it exists. |
| 338 | if (CatchParam) { |
| 339 | QualType CatchType = CatchParam->getType().getNonReferenceType(); |
| 340 | if (!CatchType.getTypePtr()->isPointerType()) |
| 341 | CatchType = getContext().getPointerType(CatchType); |
| 342 | ExcObject = |
| 343 | Builder.CreateBitCast(ExcObject, ConvertType(CatchType)); |
| 344 | // CatchParam is a ParmVarDecl because of the grammar |
| 345 | // construction used to handle this, but for codegen purposes |
| 346 | // we treat this as a local decl. |
| 347 | EmitLocalBlockVarDecl(*CatchParam); |
| 348 | #if 0 |
| 349 | // FIXME: objects with ctors, references |
| 350 | Builder.CreateStore(ExcObject, GetAddrOfLocalVar(CatchParam)); |
| 351 | #else |
| 352 | CopyObject(*this, CatchParam->getType().getNonReferenceType(), |
| 353 | ExcObject, GetAddrOfLocalVar(CatchParam)); |
| 354 | #endif |
| 355 | } |
| 356 | |
| 357 | EmitStmt(CatchBody); |
| 358 | EmitBranchThroughCleanup(FinallyEnd); |
| 359 | |
| 360 | EmitBlock(MatchHandler); |
| 361 | |
| 362 | llvm::Value *Exc = Builder.CreateCall(llvm_eh_exception, "exc"); |
| 363 | // We are required to emit this call to satisfy LLVM, even |
| 364 | // though we don't use the result. |
| 365 | llvm::SmallVector<llvm::Value*, 8> Args; |
| 366 | Args.push_back(Exc); |
| 367 | Args.push_back(Personality); |
| 368 | Args.push_back(llvm::ConstantInt::get(llvm::Type::getInt32Ty(VMContext), |
| 369 | 0)); |
| 370 | Builder.CreateCall(llvm_eh_selector, Args.begin(), Args.end()); |
| 371 | Builder.CreateStore(Exc, RethrowPtr); |
| 372 | EmitBranchThroughCleanup(FinallyRethrow); |
| 373 | |
| 374 | CodeGenFunction::CleanupBlockInfo Info = PopCleanupBlock(); |
| 375 | |
| 376 | EmitBlock(MatchEnd); |
| 377 | |
| 378 | // Unfortunately, we also have to generate another EH frame here |
| 379 | // in case this throws. |
| 380 | llvm::BasicBlock *MatchEndHandler = |
| 381 | createBasicBlock("match.end.handler"); |
| 382 | llvm::BasicBlock *Cont = createBasicBlock("myinvoke.cont"); |
| 383 | Builder.CreateInvoke(getEndCatchFn(*this), |
| 384 | Cont, MatchEndHandler, |
| 385 | Args.begin(), Args.begin()); |
| 386 | |
| 387 | EmitBlock(Cont); |
| 388 | if (Info.SwitchBlock) |
| 389 | EmitBlock(Info.SwitchBlock); |
| 390 | if (Info.EndBlock) |
| 391 | EmitBlock(Info.EndBlock); |
| 392 | |
| 393 | EmitBlock(MatchEndHandler); |
| 394 | Exc = Builder.CreateCall(llvm_eh_exception, "exc"); |
| 395 | // We are required to emit this call to satisfy LLVM, even |
| 396 | // though we don't use the result. |
| 397 | Args.clear(); |
| 398 | Args.push_back(Exc); |
| 399 | Args.push_back(Personality); |
| 400 | Args.push_back(llvm::ConstantInt::get(llvm::Type::getInt32Ty(VMContext), |
| 401 | 0)); |
| 402 | Builder.CreateCall(llvm_eh_selector, Args.begin(), Args.end()); |
| 403 | Builder.CreateStore(Exc, RethrowPtr); |
| 404 | EmitBranchThroughCleanup(FinallyRethrow); |
| 405 | |
| 406 | if (Next) |
| 407 | EmitBlock(Next); |
| 408 | } |
| 409 | if (!HasCatchAll) |
| 410 | EmitBranchThroughCleanup(FinallyRethrow); |
Mike Stump | 2bf701e | 2009-11-20 23:44:51 +0000 | [diff] [blame] | 411 | |
| 412 | CodeGenFunction::CleanupBlockInfo Info = PopCleanupBlock(); |
| 413 | |
| 414 | setInvokeDest(PrevLandingPad); |
| 415 | |
Mike Stump | 0f590be | 2009-12-01 03:41:18 +0000 | [diff] [blame] | 416 | #if 0 |
Mike Stump | 2bf701e | 2009-11-20 23:44:51 +0000 | [diff] [blame] | 417 | EmitBlock(FinallyBlock); |
| 418 | |
Mike Stump | 0f590be | 2009-12-01 03:41:18 +0000 | [diff] [blame] | 419 | if (Info.SwitchBlock) |
| 420 | EmitBlock(Info.SwitchBlock); |
| 421 | if (Info.EndBlock) |
| 422 | EmitBlock(Info.EndBlock); |
| 423 | |
Mike Stump | 2bf701e | 2009-11-20 23:44:51 +0000 | [diff] [blame] | 424 | // Branch around the rethrow code. |
| 425 | EmitBranch(FinallyEnd); |
Mike Stump | 0f590be | 2009-12-01 03:41:18 +0000 | [diff] [blame] | 426 | #endif |
Mike Stump | 2bf701e | 2009-11-20 23:44:51 +0000 | [diff] [blame] | 427 | |
| 428 | EmitBlock(FinallyRethrow); |
Mike Stump | 0f590be | 2009-12-01 03:41:18 +0000 | [diff] [blame] | 429 | Builder.CreateCall(getUnwindResumeOrRethrowFn(*this), |
| 430 | Builder.CreateLoad(RethrowPtr)); |
Mike Stump | 2bf701e | 2009-11-20 23:44:51 +0000 | [diff] [blame] | 431 | Builder.CreateUnreachable(); |
Mike Stump | 2bf701e | 2009-11-20 23:44:51 +0000 | [diff] [blame] | 432 | |
| 433 | EmitBlock(FinallyEnd); |
| 434 | #endif |
| 435 | } |