[MachineOutliner] AArch64: Emit CFI instructions when outlining calls
When outlining calls, the outliner needs to update CFI to ensure that, say,
exception handling works. This commit adds that functionality and adds a test
just for call outlining.
Call outlining stuff in machine-outliner.mir should be moved into
machine-outliner-calls.mir in a later commit.
llvm-svn: 327917
diff --git a/llvm/lib/Target/AArch64/AArch64InstrInfo.cpp b/llvm/lib/Target/AArch64/AArch64InstrInfo.cpp
index 0164905..585524e 100644
--- a/llvm/lib/Target/AArch64/AArch64InstrInfo.cpp
+++ b/llvm/lib/Target/AArch64/AArch64InstrInfo.cpp
@@ -5282,6 +5282,25 @@
.addImm(-16);
It = MBB.insert(It, STRXpre);
+ const TargetSubtargetInfo &STI = MF.getSubtarget();
+ const MCRegisterInfo *MRI = STI.getRegisterInfo();
+ unsigned DwarfReg = MRI->getDwarfRegNum(AArch64::LR, true);
+
+ // Add a CFI saying the stack was moved 16 B down.
+ int64_t StackPosEntry =
+ MF.addFrameInst(MCCFIInstruction::createDefCfaOffset(nullptr, 16));
+ BuildMI(MBB, It, DebugLoc(), get(AArch64::CFI_INSTRUCTION))
+ .addCFIIndex(StackPosEntry)
+ .setMIFlags(MachineInstr::FrameSetup);
+
+ // Add a CFI saying that the LR that we want to find is now 16 B higher than
+ // before.
+ int64_t LRPosEntry =
+ MF.addFrameInst(MCCFIInstruction::createOffset(nullptr, DwarfReg, 16));
+ BuildMI(MBB, It, DebugLoc(), get(AArch64::CFI_INSTRUCTION))
+ .addCFIIndex(LRPosEntry)
+ .setMIFlags(MachineInstr::FrameSetup);
+
// Insert a restore before the terminator for the function.
MachineInstr *LDRXpost = BuildMI(MF, DebugLoc(), get(AArch64::LDRXpost))
.addReg(AArch64::SP, RegState::Define)