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[mips] Replace assertion by error message while lowering RETURNADDR and FRAMEADDR

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MIPS target supports lowering `RETURNADDR` and `FRAMEADDR` for a current
frame only. It's better to show an error message then crash on assertion
if `__builtin_return_address` is invoked with non-zero argument.

llvm-svn: 355558
This commit is contained in:
Simon Atanasyan 2019-03-06 22:40:28 +00:00
parent ef4c6a650d
commit 59eb4a19ba
3 changed files with 32 additions and 4 deletions
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14
lib/Target/Mips/MipsISelLowering.cpp
View File

@ -2376,8 +2376,11 @@ SDValue MipsTargetLowering::lowerFABS(SDValue Op, SelectionDAG &DAG) const {
SDValue MipsTargetLowering::
lowerFRAMEADDR(SDValue Op, SelectionDAG &DAG) const {
// check the depth
assert((cast<ConstantSDNode>(Op.getOperand(0))->getZExtValue() == 0) &&
"Frame address can only be determined for current frame.");
if (cast<ConstantSDNode>(Op.getOperand(0))->getZExtValue() != 0) {
DAG.getContext()->emitError(
"return address can be determined only for current frame");
return SDValue();
}
MachineFrameInfo &MFI = DAG.getMachineFunction().getFrameInfo();
MFI.setFrameAddressIsTaken(true);
@ -2394,8 +2397,11 @@ SDValue MipsTargetLowering::lowerRETURNADDR(SDValue Op,
return SDValue();
// check the depth
assert((cast<ConstantSDNode>(Op.getOperand(0))->getZExtValue() == 0) &&
"Return address can be determined only for current frame.");
if (cast<ConstantSDNode>(Op.getOperand(0))->getZExtValue() != 0) {
DAG.getContext()->emitError(
"return address can be determined only for current frame");
return SDValue();
}
MachineFunction &MF = DAG.getMachineFunction();
MachineFrameInfo &MFI = MF.getFrameInfo();

11
test/CodeGen/Mips/frame-address-err.ll Normal file
View File

@ -0,0 +1,11 @@
; RUN: not llc -march=mips < %s 2>&1 | FileCheck %s
declare i8* @llvm.frameaddress(i32) nounwind readnone
define i8* @f() nounwind {
entry:
%0 = call i8* @llvm.frameaddress(i32 1)
ret i8* %0
; CHECK: error: return address can be determined only for current frame
}

11
test/CodeGen/Mips/return_address_err.ll Normal file
View File

@ -0,0 +1,11 @@
; RUN: not llc -march=mips < %s 2>&1 | FileCheck %s
declare i8* @llvm.returnaddress(i32) nounwind readnone
define i8* @f() nounwind {
entry:
%0 = call i8* @llvm.returnaddress(i32 1)
ret i8* %0
; CHECK: error: return address can be determined only for current frame
}