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//===- LiveDebugVariables.h - Tracking debug info variables ----*- c++ -*--===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file provides the interface to the LiveDebugVariables analysis.
//
// The analysis removes DBG_VALUE instructions for virtual registers and tracks
// live user variables in a data structure that can be updated during register
// allocation.
//
// After register allocation new DBG_VALUE instructions are emitted to reflect
// the new locations of user variables.
//
//===----------------------------------------------------------------------===//
#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 LiveIntervals;
class VirtRegMap;
class LiveDebugVariables : public MachineFunctionPass {
void *pImpl;
public:
static char ID; // Pass identification, replacement for typeid
LiveDebugVariables();
~LiveDebugVariables();
/// renameRegister - Move any user variables in OldReg to NewReg:SubIdx.
/// @param OldReg Old virtual register that is going away.
/// @param NewReg New register holding the user variables.
/// @param SubIdx If NewReg is a virtual register, SubIdx may indicate a sub-
/// 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<unsigned> NewRegs,
LiveIntervals &LIS);
/// emitDebugValues - Emit new DBG_VALUE instructions reflecting the changes
/// that happened during register allocation.
/// @param VRM Rename virtual registers according to map.
void emitDebugValues(VirtRegMap *VRM);
/// dump - Print data structures to dbgs().
void dump();
private:
bool runOnMachineFunction(MachineFunction &) override;
void releaseMemory() override;
void getAnalysisUsage(AnalysisUsage &) const override;
};
} // namespace llvm
#endif // LLVM_CODEGEN_LIVEDEBUGVARIABLES_H
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