Enable the implementation of __builtin_setjmp and __builtin_longjmp. Not all
LLVM backends support these yet.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@104867 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/CGBuiltin.cpp b/lib/CodeGen/CGBuiltin.cpp
index dd505c2..8c3478c 100644
--- a/lib/CodeGen/CGBuiltin.cpp
+++ b/lib/CodeGen/CGBuiltin.cpp
@@ -557,30 +557,33 @@
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:
diff --git a/test/CodeGen/builtins.c b/test/CodeGen/builtins.c
index 8b61258..2355fb4 100644
--- a/test/CodeGen/builtins.c
+++ b/test/CodeGen/builtins.c
@@ -195,3 +195,10 @@
// 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
+}