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/Passes.h"
19 #include "llvm/Target/TargetRegisterInfo.h"
20 #include "llvm/Support/Debug.h"
21 #include "llvm/ADT/Statistic.h"
24 char LiveStacks::ID = 0;
25 static RegisterPass<LiveStacks> X("livestacks", "Live Stack Slot Analysis");
27 void LiveStacks::getAnalysisUsage(AnalysisUsage &AU) const {
31 void LiveStacks::releaseMemory() {
32 // Release VNInfo memroy regions after all VNInfo objects are dtor'd.
33 VNInfoAllocator.Reset();
37 bool LiveStacks::runOnMachineFunction(MachineFunction &) {
38 // FIXME: No analysis is being done right now. We are relying on the
39 // register allocators to provide the information.
43 /// print - Implement the dump method.
44 void LiveStacks::print(std::ostream &O, const Module* ) const {
45 O << "********** INTERVALS **********\n";
46 for (const_iterator I = begin(), E = end(); I != E; ++I) {