[PATCH] D138084: [LoongArch] Support when the depth of __builtin_frame_address is greater than zero
Gong LingQin via Phabricator via llvm-commits
llvm-commits at lists.llvm.org
Tue Nov 15 18:41:27 PST 2022
gonglingqin created this revision.
gonglingqin added reviewers: xen0n, xry111, SixWeining, wangleiat, MaskRay, XiaodongLoong.
Herald added subscribers: StephenFan, hiraditya.
Herald added a project: All.
gonglingqin requested review of this revision.
Herald added a project: LLVM.
Herald added a subscriber: llvm-commits.
As discussed in D137541 <https://reviews.llvm.org/D137541>, it supports processing when the depth of
__builtin_frame_address is greater than 0 instead of reporting an error.
Unsafe calls rely on the '-Wframe-address' option for diagnosis.
Repository:
rG LLVM Github Monorepo
https://reviews.llvm.org/D138084
Files:
llvm/lib/Target/LoongArch/LoongArchISelLowering.cpp
llvm/test/CodeGen/LoongArch/frameaddr-returnaddr-error.ll
llvm/test/CodeGen/LoongArch/frameaddr-returnaddr.ll
Index: llvm/test/CodeGen/LoongArch/frameaddr-returnaddr.ll
===================================================================
--- llvm/test/CodeGen/LoongArch/frameaddr-returnaddr.ll
+++ llvm/test/CodeGen/LoongArch/frameaddr-returnaddr.ll
@@ -33,6 +33,36 @@
ret ptr %1
}
+define ptr @test_frameaddress_2() nounwind {
+; LA32-LABEL: test_frameaddress_2:
+; LA32: # %bb.0:
+; LA32-NEXT: addi.w $sp, $sp, -16
+; LA32-NEXT: st.w $ra, $sp, 12 # 4-byte Folded Spill
+; LA32-NEXT: st.w $fp, $sp, 8 # 4-byte Folded Spill
+; LA32-NEXT: addi.w $fp, $sp, 16
+; LA32-NEXT: ld.w $a0, $fp, -8
+; LA32-NEXT: ld.w $a0, $a0, -8
+; LA32-NEXT: ld.w $fp, $sp, 8 # 4-byte Folded Reload
+; LA32-NEXT: ld.w $ra, $sp, 12 # 4-byte Folded Reload
+; LA32-NEXT: addi.w $sp, $sp, 16
+; LA32-NEXT: ret
+;
+; LA64-LABEL: test_frameaddress_2:
+; LA64: # %bb.0:
+; LA64-NEXT: addi.d $sp, $sp, -16
+; LA64-NEXT: st.d $ra, $sp, 8 # 8-byte Folded Spill
+; LA64-NEXT: st.d $fp, $sp, 0 # 8-byte Folded Spill
+; LA64-NEXT: addi.d $fp, $sp, 16
+; LA64-NEXT: ld.d $a0, $fp, -16
+; LA64-NEXT: ld.d $a0, $a0, -16
+; LA64-NEXT: ld.d $fp, $sp, 0 # 8-byte Folded Reload
+; LA64-NEXT: ld.d $ra, $sp, 8 # 8-byte Folded Reload
+; LA64-NEXT: addi.d $sp, $sp, 16
+; LA64-NEXT: ret
+ %1 = call ptr @llvm.frameaddress(i32 2)
+ ret ptr %1
+}
+
define ptr @test_returnaddress_0() nounwind {
; LA32-LABEL: test_returnaddress_0:
; LA32: # %bb.0:
Index: llvm/test/CodeGen/LoongArch/frameaddr-returnaddr-error.ll
===================================================================
--- llvm/test/CodeGen/LoongArch/frameaddr-returnaddr-error.ll
+++ llvm/test/CodeGen/LoongArch/frameaddr-returnaddr-error.ll
@@ -16,13 +16,6 @@
ret ptr %1
}
-define ptr @non_zero_frameaddress() nounwind {
-; CHECK: frame address can only be determined for the current frame
- %1 = call ptr @llvm.frameaddress(i32 1)
- ret ptr %1
-}
-
-
define ptr @non_zero_returnaddress() nounwind {
; CHECK: return address can only be determined for the current frame
%1 = call ptr @llvm.returnaddress(i32 1)
Index: llvm/lib/Target/LoongArch/LoongArchISelLowering.cpp
===================================================================
--- llvm/lib/Target/LoongArch/LoongArchISelLowering.cpp
+++ llvm/lib/Target/LoongArch/LoongArchISelLowering.cpp
@@ -254,19 +254,23 @@
return SDValue();
}
- // Currently only support lowering frame address for current frame.
- if (cast<ConstantSDNode>(Op.getOperand(0))->getZExtValue() != 0) {
- DAG.getContext()->emitError(
- "frame address can only be determined for the current frame");
- return SDValue();
- }
-
MachineFunction &MF = DAG.getMachineFunction();
MF.getFrameInfo().setFrameAddressIsTaken(true);
-
- return DAG.getCopyFromReg(DAG.getEntryNode(), SDLoc(Op),
- Subtarget.getRegisterInfo()->getFrameRegister(MF),
- Op.getValueType());
+ Register FrameReg = Subtarget.getRegisterInfo()->getFrameRegister(MF);
+ EVT VT = Op.getValueType();
+ SDLoc DL(Op);
+ SDValue FrameAddr = DAG.getCopyFromReg(DAG.getEntryNode(), DL, FrameReg, VT);
+ unsigned Depth = cast<ConstantSDNode>(Op.getOperand(0))->getZExtValue();
+ int GRLenInBytes = Subtarget.getGRLen() / 8;
+
+ while (Depth--) {
+ int Offset = -(GRLenInBytes * 2);
+ SDValue Ptr = DAG.getNode(ISD::ADD, DL, VT, FrameAddr,
+ DAG.getIntPtrConstant(Offset, DL));
+ FrameAddr =
+ DAG.getLoad(VT, DL, DAG.getEntryNode(), Ptr, MachinePointerInfo());
+ }
+ return FrameAddr;
}
SDValue LoongArchTargetLowering::lowerRETURNADDR(SDValue Op,
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