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