SjLj based exception handling unwinding support. This patch is nasty, brutish
and short. Well, it's kinda short. Definitely nasty and brutish.
The front-end generates the register/unregister calls into the SjLj runtime,
call-site indices and landing pad dispatch. The back end fills in the LSDA
with the call-site information provided by the front end. Catch blocks are
not yet implemented.
Built on Darwin and verified no llvm-core "make check" regressions.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@78625 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/ARM/ARMISelLowering.cpp b/lib/Target/ARM/ARMISelLowering.cpp
index aedddaa..61722d4 100644
--- a/lib/Target/ARM/ARMISelLowering.cpp
+++ b/lib/Target/ARM/ARMISelLowering.cpp
@@ -1392,6 +1392,37 @@
EVT PtrVT = DAG.getTargetLoweringInfo().getPointerTy();
return DAG.getNode(ARMISD::THREAD_POINTER, dl, PtrVT);
}
+ case Intrinsic::eh_sjlj_lsda: {
+ // blah. horrible, horrible hack with the forced magic name.
+ // really need to clean this up. It belongs in the target-independent
+ // layer somehow that doesn't require the coupling with the asm
+ // printer.
+ MachineFunction &MF = DAG.getMachineFunction();
+ EVT PtrVT = getPointerTy();
+ DebugLoc dl = Op.getDebugLoc();
+ Reloc::Model RelocM = getTargetMachine().getRelocationModel();
+ SDValue CPAddr;
+ unsigned PCAdj = (RelocM != Reloc::PIC_)
+ ? 0 : (Subtarget->isThumb() ? 4 : 8);
+ ARMCP::ARMCPKind Kind = ARMCP::CPValue;
+ // Save off the LSDA name for the AsmPrinter to use when it's time
+ // to emit the table
+ std::string LSDAName = "L_lsda_";
+ LSDAName += MF.getFunction()->getName();
+ ARMConstantPoolValue *CPV =
+ new ARMConstantPoolValue(LSDAName.c_str(), ARMPCLabelIndex, Kind, PCAdj);
+ CPAddr = DAG.getTargetConstantPool(CPV, PtrVT, 4);
+ CPAddr = DAG.getNode(ARMISD::Wrapper, dl, EVT::i32, CPAddr);
+ SDValue Result =
+ DAG.getLoad(PtrVT, dl, DAG.getEntryNode(), CPAddr, NULL, 0);
+ SDValue Chain = Result.getValue(1);
+
+ if (RelocM == Reloc::PIC_) {
+ SDValue PICLabel = DAG.getConstant(ARMPCLabelIndex++, EVT::i32);
+ Result = DAG.getNode(ARMISD::PIC_ADD, dl, PtrVT, Result, PICLabel);
+ }
+ return Result;
+ }
case Intrinsic::eh_sjlj_setjmp:
return DAG.getNode(ARMISD::EH_SJLJ_SETJMP, dl, EVT::i32, Op.getOperand(1));
}