1f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org//===-- LiveStackAnalysis.cpp - Live Stack Slot Analysis ------------------===// 2f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org// 3f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org// The LLVM Compiler Infrastructure 4f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org// 5f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org// This file is distributed under the University of Illinois Open Source 6f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org// License. See LICENSE.TXT for details. 7f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org// 8f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org//===----------------------------------------------------------------------===// 9f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org// 10f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org// This file implements the live stack slot analysis pass. It is analogous to 11f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org// live interval analysis except it's analyzing liveness of stack slots rather 12f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org// than registers. 13f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org// 14f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org//===----------------------------------------------------------------------===// 15f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 16f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org#include "llvm/CodeGen/LiveStackAnalysis.h" 17f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org#include "llvm/ADT/Statistic.h" 18f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org#include "llvm/CodeGen/LiveIntervalAnalysis.h" 19f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org#include "llvm/CodeGen/Passes.h" 20f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org#include "llvm/Support/Debug.h" 21f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org#include "llvm/Support/raw_ostream.h" 22f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org#include "llvm/Target/TargetRegisterInfo.h" 23f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org#include <limits> 24f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.orgusing namespace llvm; 25f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 26f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org#define DEBUG_TYPE "livestacks" 27f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 28f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.orgchar LiveStacks::ID = 0; 29f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.orgINITIALIZE_PASS_BEGIN(LiveStacks, "livestacks", 30f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org "Live Stack Slot Analysis", false, false) 31f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.orgINITIALIZE_PASS_DEPENDENCY(SlotIndexes) 32f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.orgINITIALIZE_PASS_END(LiveStacks, "livestacks", 33f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org "Live Stack Slot Analysis", false, false) 34f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 35f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.orgchar &llvm::LiveStacksID = LiveStacks::ID; 36f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 37f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.orgvoid LiveStacks::getAnalysisUsage(AnalysisUsage &AU) const { 38f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org AU.setPreservesAll(); 39f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org AU.addPreserved<SlotIndexes>(); 40f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org AU.addRequiredTransitive<SlotIndexes>(); 41f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org MachineFunctionPass::getAnalysisUsage(AU); 42f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org} 43f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 44f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.orgvoid LiveStacks::releaseMemory() { 45f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org // Release VNInfo memory regions, VNInfo objects don't need to be dtor'd. 46f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org VNInfoAllocator.Reset(); 47f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org S2IMap.clear(); 48f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org S2RCMap.clear(); 49f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org} 50f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 51f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.orgbool LiveStacks::runOnMachineFunction(MachineFunction &MF) { 52f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org TRI = MF.getTarget().getRegisterInfo(); 53f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org // FIXME: No analysis is being done right now. We are relying on the 54f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org // register allocators to provide the information. 55f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org return false; 56f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org} 57f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 58f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.orgLiveInterval & 59f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.orgLiveStacks::getOrCreateInterval(int Slot, const TargetRegisterClass *RC) { 60f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org assert(Slot >= 0 && "Spill slot indice must be >= 0"); 61f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org SS2IntervalMap::iterator I = S2IMap.find(Slot); 62f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org if (I == S2IMap.end()) { 63f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org I = S2IMap.insert(I, std::make_pair(Slot, 64f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org LiveInterval(TargetRegisterInfo::index2StackSlot(Slot), 0.0F))); 65f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org S2RCMap.insert(std::make_pair(Slot, RC)); 66f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org } else { 67f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org // Use the largest common subclass register class. 68f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org const TargetRegisterClass *OldRC = S2RCMap[Slot]; 69f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org S2RCMap[Slot] = TRI->getCommonSubClass(OldRC, RC); 70f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org } 71f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org return I->second; 72f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org} 73f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 74f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org/// print - Implement the dump method. 75f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.orgvoid LiveStacks::print(raw_ostream &OS, const Module*) const { 76f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 77f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org OS << "********** INTERVALS **********\n"; 78f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org for (const_iterator I = begin(), E = end(); I != E; ++I) { 79f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org I->second.print(OS); 80f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org int Slot = I->first; 81f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org const TargetRegisterClass *RC = getIntervalRegClass(Slot); 82f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org if (RC) 83f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org OS << " [" << RC->getName() << "]\n"; 84f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org else 85f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org OS << " [Unknown]\n"; 86f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org } 87f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org} 88f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org