Update LiveDebugVariables after live range splitting.
After a virtual register is split, update any debug user variables that resided
in the old register. This ensures that the LiveDebugVariables are still correct
after register allocation.
This may create DBG_VALUE instructions that place a user variable in a register
in parts of the function and in a stack slot in other parts. DwarfDebug
currently doesn't support that.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@130998 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/LiveDebugVariables.h b/lib/CodeGen/LiveDebugVariables.h
index a6e40a1..3ce3c39 100644
--- a/lib/CodeGen/LiveDebugVariables.h
+++ b/lib/CodeGen/LiveDebugVariables.h
@@ -21,10 +21,12 @@
#ifndef LLVM_CODEGEN_LIVEDEBUGVARIABLES_H
#define LLVM_CODEGEN_LIVEDEBUGVARIABLES_H
+#include "llvm/ADT/ArrayRef.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
namespace llvm {
+class LiveInterval;
class VirtRegMap;
class LiveDebugVariables : public MachineFunctionPass {
@@ -42,6 +44,11 @@
/// register.
void renameRegister(unsigned OldReg, unsigned NewReg, unsigned SubIdx);
+ /// splitRegister - Move any user variables in OldReg to the live ranges in
+ /// NewRegs where they are live. Mark the values as unavailable where no new
+ /// register is live.
+ void splitRegister(unsigned OldReg, ArrayRef<LiveInterval*> NewRegs);
+
/// emitDebugValues - Emit new DBG_VALUE instructions reflecting the changes
/// that happened during register allocation.
/// @param VRM Rename virtual registers according to map.