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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. llvm-svn: 120385
51 lines
1.8 KiB
C++
51 lines
1.8 KiB
C++
//===- LiveDebugVariables.cpp - Tracking debug info variables -------------===//
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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 implements the LiveDebugVariables analysis.
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//
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// Remove all DBG_VALUE instructions referencing virtual registers and replace
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// them with a data structure tracking where live user variables are kept - in a
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// virtual register or in a stack slot.
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//
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// Allow the data structure to be updated during register allocation when values
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// are moved between registers and stack slots. Finally emit new DBG_VALUE
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// instructions after register allocation is complete.
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//
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//===----------------------------------------------------------------------===//
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#include "LiveDebugVariables.h"
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#include "llvm/CodeGen/LiveIntervalAnalysis.h"
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#include "llvm/CodeGen/MachineFunction.h"
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#include "llvm/CodeGen/Passes.h"
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#include "llvm/Target/TargetMachine.h"
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using namespace llvm;
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char LiveDebugVariables::ID = 0;
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INITIALIZE_PASS_BEGIN(LiveDebugVariables, "livedebugvars",
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"Debug Variable Analysis", false, false)
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INITIALIZE_PASS_DEPENDENCY(LiveIntervals)
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INITIALIZE_PASS_END(LiveDebugVariables, "livedebugvars",
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"Debug Variable Analysis", false, false)
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void LiveDebugVariables::getAnalysisUsage(AnalysisUsage &AU) const {
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AU.addRequiredTransitive<LiveIntervals>();
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AU.setPreservesAll();
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MachineFunctionPass::getAnalysisUsage(AU);
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}
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LiveDebugVariables::LiveDebugVariables() : MachineFunctionPass(ID) {
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initializeLiveDebugVariablesPass(*PassRegistry::getPassRegistry());
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}
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bool LiveDebugVariables::runOnMachineFunction(MachineFunction &mf) {
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return false;
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}
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