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zero-cost exception API for NeXt runtime. 

rethrow inside @catch block must use objc_exception_rethrow
API. Fixes radar 8037512. Test will be added to LLVM
test suite.

llvm-svn: 104964
This commit is contained in:
Fariborz Jahanian 2010-05-28 17:34:43 +00:00
parent aabfdb39af
commit 3336de141a
1 changed files with 14 additions and 2 deletions
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16
clang/lib/CodeGen/CGObjCMac.cpp
View File

@ -440,6 +440,15 @@ public:
return CGM.CreateRuntimeFunction(FTy, "objc_exception_throw");
}
/// ExceptionRethrowFn - LLVM objc_exception_rethrow function.
llvm::Constant *getExceptionRethrowFn() {
// void objc_exception_rethrow(void)
std::vector<const llvm::Type*> Args;
llvm::FunctionType *FTy =
llvm::FunctionType::get(llvm::Type::getVoidTy(VMContext), Args, true);
return CGM.CreateRuntimeFunction(FTy, "objc_exception_rethrow");
}
/// SyncEnterFn - LLVM object_sync_enter function.
llvm::Constant *getSyncEnterFn() {
// void objc_sync_enter (id)
@ -5803,12 +5812,15 @@ CGObjCNonFragileABIMac::EmitTryOrSynchronizedStmt(CodeGen::CodeGenFunction &CGF,
void CGObjCNonFragileABIMac::EmitThrowStmt(CodeGen::CodeGenFunction &CGF,
const ObjCAtThrowStmt &S) {
llvm::Value *Exception;
llvm::Constant *FunctionThrowOrRethrow;
if (const Expr *ThrowExpr = S.getThrowExpr()) {
Exception = CGF.EmitScalarExpr(ThrowExpr);
FunctionThrowOrRethrow = ObjCTypes.getExceptionThrowFn();
} else {
assert((!CGF.ObjCEHValueStack.empty() && CGF.ObjCEHValueStack.back()) &&
"Unexpected rethrow outside @catch block.");
Exception = CGF.ObjCEHValueStack.back();
FunctionThrowOrRethrow = ObjCTypes.getExceptionRethrowFn();
}
llvm::Value *ExceptionAsObject =
@ -5816,12 +5828,12 @@ void CGObjCNonFragileABIMac::EmitThrowStmt(CodeGen::CodeGenFunction &CGF,
llvm::BasicBlock *InvokeDest = CGF.getInvokeDest();
if (InvokeDest) {
llvm::BasicBlock *Cont = CGF.createBasicBlock("invoke.cont");
CGF.Builder.CreateInvoke(ObjCTypes.getExceptionThrowFn(),
CGF.Builder.CreateInvoke(FunctionThrowOrRethrow,
Cont, InvokeDest,
&ExceptionAsObject, &ExceptionAsObject + 1);
CGF.EmitBlock(Cont);
} else
CGF.Builder.CreateCall(ObjCTypes.getExceptionThrowFn(), ExceptionAsObject);
CGF.Builder.CreateCall(FunctionThrowOrRethrow, ExceptionAsObject);
CGF.Builder.CreateUnreachable();
// Clear the insertion point to indicate we are in unreachable code.