[PATCH] D63411: [WIP][RISCV] Specify registers used in DWARF exception handling

[Edward Jones via Phabricator via llvm-commits]

edward-jones created this revision.
edward-jones added reviewers: asb, lewis-revill.
Herald added subscribers: llvm-commits, Jim, benna, psnobl, jocewei, PkmX, rkruppe, the_o, brucehoult, MartinMosbeck, rogfer01, zzheng, jrtc27, shiva0217, kito-cheng, niosHD, sabuasal, apazos, simoncook, johnrusso, rbar.
Herald added a project: LLVM.

Defines RISCV registers for getExceptionPointerRegister() and getExceptionSelectorRegister()


Repository:
  rL LLVM

https://reviews.llvm.org/D63411

Files:
  lib/Target/RISCV/RISCVISelLowering.cpp
  lib/Target/RISCV/RISCVISelLowering.h


Index: lib/Target/RISCV/RISCVISelLowering.h
===================================================================
--- lib/Target/RISCV/RISCVISelLowering.h
+++ lib/Target/RISCV/RISCVISelLowering.h
@@ -126,6 +126,16 @@
     return true;
   }
 
+  /// If a physical register, this returns the register that receives the
+  /// exception address on entry to an EH pad.
+  unsigned
+  getExceptionPointerRegister(const Constant *PersonalityFn) const override;
+
+  /// If a physical register, this returns the register that receives the
+  /// exception typeid on entry to a landing pad.
+  unsigned
+  getExceptionSelectorRegister(const Constant *PersonalityFn) const override;
+
 private:
   void analyzeInputArgs(MachineFunction &MF, CCState &CCInfo,
                         const SmallVectorImpl<ISD::InputArg> &Ins,
Index: lib/Target/RISCV/RISCVISelLowering.cpp
===================================================================
--- lib/Target/RISCV/RISCVISelLowering.cpp
+++ lib/Target/RISCV/RISCVISelLowering.cpp
@@ -2353,3 +2353,13 @@
     Result = Builder.CreateTrunc(Result, Builder.getInt32Ty());
   return Result;
 }
+
+unsigned RISCVTargetLowering::getExceptionPointerRegister(
+    const Constant *PersonalityFn) const {
+  return RISCV::X10;
+}
+
+unsigned RISCVTargetLowering::getExceptionSelectorRegister(
+    const Constant *PersonalityFn) const {
+  return RISCV::X11;
+}


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