52 lines
1.7 KiB
C++
52 lines
1.7 KiB
C++
//===-- LiveStackAnalysis.cpp - Live Stack Slot Analysis ------------------===//
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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 live stack slot analysis pass. It is analogous to
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// live interval analysis except it's analyzing liveness of stack slots rather
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// than registers.
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//
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//===----------------------------------------------------------------------===//
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#define DEBUG_TYPE "livestacks"
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#include "llvm/CodeGen/LiveStackAnalysis.h"
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#include "llvm/CodeGen/Passes.h"
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#include "llvm/Target/TargetRegisterInfo.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/ADT/Statistic.h"
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using namespace llvm;
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char LiveStacks::ID = 0;
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static RegisterPass<LiveStacks> X("livestacks", "Live Stack Slot Analysis");
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void LiveStacks::getAnalysisUsage(AnalysisUsage &AU) const {
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AU.setPreservesAll();
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MachineFunctionPass::getAnalysisUsage(AU);
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}
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void LiveStacks::releaseMemory() {
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// Release VNInfo memroy regions after all VNInfo objects are dtor'd.
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VNInfoAllocator.Reset();
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s2iMap.clear();
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}
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bool LiveStacks::runOnMachineFunction(MachineFunction &) {
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// FIXME: No analysis is being done right now. We are relying on the
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// register allocators to provide the information.
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return false;
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}
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/// print - Implement the dump method.
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void LiveStacks::print(std::ostream &O, const Module* ) const {
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O << "********** INTERVALS **********\n";
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for (const_iterator I = begin(), E = end(); I != E; ++I) {
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I->second.print(O);
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O << "\n";
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}
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}
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