1
//===-- LiveStackAnalysis.cpp - Live Stack Slot Analysis ------------------===//
3
// The LLVM Compiler Infrastructure
5
// This file is distributed under the University of Illinois Open Source
6
// License. See LICENSE.TXT for details.
8
//===----------------------------------------------------------------------===//
10
// This file implements the live stack slot analysis pass. It is analogous to
11
// live interval analysis except it's analyzing liveness of stack slots rather
14
//===----------------------------------------------------------------------===//
16
#define DEBUG_TYPE "livestacks"
17
#include "llvm/CodeGen/LiveStackAnalysis.h"
18
#include "llvm/CodeGen/LiveIntervalAnalysis.h"
19
#include "llvm/CodeGen/Passes.h"
20
#include "llvm/Target/TargetRegisterInfo.h"
21
#include "llvm/Support/Debug.h"
22
#include "llvm/Support/raw_ostream.h"
23
#include "llvm/ADT/Statistic.h"
27
char LiveStacks::ID = 0;
28
static RegisterPass<LiveStacks> X("livestacks", "Live Stack Slot Analysis");
30
void LiveStacks::getAnalysisUsage(AnalysisUsage &AU) const {
32
AU.addPreserved<SlotIndexes>();
33
AU.addRequiredTransitive<SlotIndexes>();
34
MachineFunctionPass::getAnalysisUsage(AU);
37
void LiveStacks::releaseMemory() {
38
// Release VNInfo memroy regions after all VNInfo objects are dtor'd.
39
VNInfoAllocator.Reset();
44
bool LiveStacks::runOnMachineFunction(MachineFunction &) {
45
// FIXME: No analysis is being done right now. We are relying on the
46
// register allocators to provide the information.
50
/// print - Implement the dump method.
51
void LiveStacks::print(raw_ostream &OS, const Module*) const {
53
OS << "********** INTERVALS **********\n";
54
for (const_iterator I = begin(), E = end(); I != E; ++I) {
57
const TargetRegisterClass *RC = getIntervalRegClass(Slot);
59
OS << " [" << RC->getName() << "]\n";