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Enable the implementation of __builtin_setjmp and __builtin_longjmp. Not all 

LLVM backends support these yet.

llvm-svn: 104867
This commit is contained in:
John McCall 2010-05-27 18:47:06 +00:00
parent dc53f1cb5c
commit 02269a66b3
2 changed files with 25 additions and 15 deletions
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33
clang/lib/CodeGen/CGBuiltin.cpp
View File

@ -557,30 +557,33 @@ RValue CodeGenFunction::EmitBuiltinExpr(const FunctionDecl *FD,
else
return RValue::get(Builder.CreateZExt(Result, Int64Ty, "extend.zext"));
}
#if 0
// FIXME: Finish/enable when LLVM backend support stabilizes
case Builtin::BI__builtin_setjmp: {
// Buffer is a void**.
Value *Buf = EmitScalarExpr(E->getArg(0));
// Store the frame pointer to the buffer
Value *FrameAddrF = CGM.getIntrinsic(Intrinsic::frameaddress, 0, 0);
// Store the frame pointer to the setjmp buffer.
Value *FrameAddr =
Builder.CreateCall(FrameAddrF,
Constant::getNullValue(llvm::Type::getInt32Ty(VMContext)));
Builder.CreateCall(CGM.getIntrinsic(Intrinsic::frameaddress),
ConstantInt::get(llvm::Type::getInt32Ty(VMContext), 0));
Builder.CreateStore(FrameAddr, Buf);
// Call the setjmp intrinsic
Value *F = CGM.getIntrinsic(Intrinsic::eh_sjlj_setjmp, 0, 0);
const llvm::Type *DestType = llvm::Type::getInt8PtrTy(VMContext);
Buf = Builder.CreateBitCast(Buf, DestType);
// Call LLVM's EH setjmp, which is lightweight.
Value *F = CGM.getIntrinsic(Intrinsic::eh_sjlj_setjmp);
Buf = Builder.CreateBitCast(Buf, llvm::Type::getInt8PtrTy(VMContext));
return RValue::get(Builder.CreateCall(F, Buf));
}
case Builtin::BI__builtin_longjmp: {
Value *F = CGM.getIntrinsic(Intrinsic::eh_sjlj_longjmp, 0, 0);
Value *Buf = EmitScalarExpr(E->getArg(0));
const llvm::Type *DestType = llvm::Type::getInt8PtrTy(VMContext);
Buf = Builder.CreateBitCast(Buf, DestType);
return RValue::get(Builder.CreateCall(F, Buf));
Buf = Builder.CreateBitCast(Buf, llvm::Type::getInt8PtrTy(VMContext));
// Call LLVM's EH longjmp, which is lightweight.
Builder.CreateCall(CGM.getIntrinsic(Intrinsic::eh_sjlj_longjmp), Buf);
// longjmp doesn't return; mark this as unreachable
Value *V = Builder.CreateUnreachable();
Builder.ClearInsertionPoint();
return RValue::get(V);
}
#endif
case Builtin::BI__sync_fetch_and_add:
case Builtin::BI__sync_fetch_and_sub:
case Builtin::BI__sync_fetch_and_or:

7
clang/test/CodeGen/builtins.c
View File

@ -195,3 +195,10 @@ void test_float_builtins(float F, double D, long double LD) {
// CHECK: and i1
}
// CHECK: define void @test_builtin_longjmp
void test_builtin_longjmp(void **buffer) {
// CHECK: [[BITCAST:%.*]] = bitcast
// CHECK-NEXT: call void @llvm.eh.sjlj.longjmp(i8* [[BITCAST]])
__builtin_longjmp(buffer, 1);
// CHECK-NEXT: unreachable
}