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This analysis is going to run immediately after LiveIntervals. It will stay alive during register allocation and keep track of user variables mentioned in DBG_VALUE instructions. When the register allocator is moving values between registers and the stack, it is very hard to keep track of DBG_VALUE instructions. We usually get it wrong. This analysis maintains a data structure that makes it easy to update DBG_VALUE instructions. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@120385 91177308-0d34-0410-b5e6-96231b3b80d8
58 lines
1.9 KiB
C++
58 lines
1.9 KiB
C++
//===- LiveDebugVariables.h - Tracking debug info variables ----*- c++ -*--===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file provides the interface to the LiveDebugVariables analysis.
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//
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// The analysis removes DBG_VALUE instructions for virtual registers and tracks
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// live user variables in a data structure that can be updated during register
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// allocation.
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//
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// After register allocation new DBG_VALUE instructions are emitted to reflect
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// the new locations of user variables.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_CODEGEN_LIVEDEBUGVARIABLES_H
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#define LLVM_CODEGEN_LIVEDEBUGVARIABLES_H
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#include "llvm/CodeGen/MachineFunctionPass.h"
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namespace llvm {
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class LiveDebugVariables : public MachineFunctionPass {
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void *pImpl;
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public:
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static char ID; // Pass identification, replacement for typeid
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LiveDebugVariables();
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/// renameRegister - Move any user variables in OldReg to NewReg:SubIdx.
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/// @param OldReg Old virtual register that is going away.
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/// @param NewReg New register holding the user variables.
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/// @param SubIdx If NewReg is a virtual register, SubIdx may indicate a sub-
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/// register.
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void renameRegister(unsigned OldReg, unsigned NewReg, unsigned SubIdx);
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/// emitDebugValues - Emit new DBG_VALUE instructions reflecting the changes
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/// that happened during register allocation.
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void emitDebugValues();
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private:
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/// runOnMachineFunction - Analyze and remove DBG_VALUE instructions.
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virtual bool runOnMachineFunction(MachineFunction &);
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virtual void getAnalysisUsage(AnalysisUsage &) const;
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};
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} // namespace llvm
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#endif // LLVM_CODEGEN_LIVEDEBUGVARIABLES_H
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