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d0fde30ce8
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@9903 91177308-0d34-0410-b5e6-96231b3b80d8
112 lines
4.1 KiB
C++
112 lines
4.1 KiB
C++
//===-- CodeGen/FunctionLiveVarInfo.h - LiveVar Analysis --------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This is the interface for live variable info of a function that is required
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// by any other part of the compiler
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//
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// After the analysis, getInSetOfBB or getOutSetofBB can be called to get
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// live var info of a BB.
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//
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// The live var set before an instruction can be obtained in 2 ways:
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//
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// 1. Use the method getLiveVarSetAfterInst(Instruction *) to get the LV Info
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// just after an instruction. (also exists getLiveVarSetBeforeInst(..))
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//
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// This function caluclates the LV info for a BB only once and caches that
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// info. If the cache does not contain the LV info of the instruction, it
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// calculates the LV info for the whole BB and caches them.
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//
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// Getting liveVar info this way uses more memory since, LV info should be
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// cached. However, if you need LV info of nearly all the instructions of a
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// BB, this is the best and simplest interfrace.
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//
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// 2. Use the OutSet and applyTranferFuncForInst(const Instruction *const Inst)
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// declared in LiveVarSet and traverse the instructions of a basic block in
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// reverse (using const_reverse_iterator in the BB class).
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//
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//===----------------------------------------------------------------------===//
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#ifndef FUNCTION_LIVE_VAR_INFO_H
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#define FUNCTION_LIVE_VAR_INFO_H
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#include "Support/hash_map"
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#include "llvm/Pass.h"
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#include "llvm/CodeGen/ValueSet.h"
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namespace llvm {
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class BBLiveVar;
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class MachineInstr;
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class FunctionLiveVarInfo : public FunctionPass {
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// Machine Instr to LiveVarSet Map for providing LVset BEFORE each inst
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// These sets are owned by this map and will be freed in releaseMemory().
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hash_map<const MachineInstr *, ValueSet *> MInst2LVSetBI;
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// Machine Instr to LiveVarSet Map for providing LVset AFTER each inst.
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// These sets are just pointers to sets in MInst2LVSetBI or BBLiveVar.
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hash_map<const MachineInstr *, ValueSet *> MInst2LVSetAI;
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hash_map<const BasicBlock*, BBLiveVar*> BBLiveVarInfo;
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// Stored Function that the data is computed with respect to
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const Function *M;
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// --------- private methods -----------------------------------------
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// constructs BBLiveVars and init Def and In sets
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void constructBBs(const Function *F);
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// do one backward pass over the CFG
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bool doSingleBackwardPass(const Function *F, unsigned int iter);
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// calculates live var sets for instructions in a BB
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void calcLiveVarSetsForBB(const BasicBlock *BB);
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public:
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// --------- Implement the FunctionPass interface ----------------------
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// runOnFunction - Perform analysis, update internal data structures.
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virtual bool runOnFunction(Function &F);
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// releaseMemory - After LiveVariable analysis has been used, forget!
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virtual void releaseMemory();
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// getAnalysisUsage - Provide self!
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virtual void getAnalysisUsage(AnalysisUsage &AU) const {
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AU.setPreservesAll();
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}
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// --------- Functions to access analysis results -------------------
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// get OutSet of a BB
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const ValueSet &getOutSetOfBB(const BasicBlock *BB) const;
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ValueSet &getOutSetOfBB(const BasicBlock *BB) ;
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// get InSet of a BB
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const ValueSet &getInSetOfBB(const BasicBlock *BB) const;
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ValueSet &getInSetOfBB(const BasicBlock *BB) ;
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// gets the Live var set BEFORE an instruction.
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// if BB is specified and the live var set has not yet been computed,
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// it will be computed on demand.
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const ValueSet &getLiveVarSetBeforeMInst(const MachineInstr *MI,
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const BasicBlock *BB = 0);
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// gets the Live var set AFTER an instruction
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// if BB is specified and the live var set has not yet been computed,
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// it will be computed on demand.
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const ValueSet &getLiveVarSetAfterMInst(const MachineInstr *MI,
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const BasicBlock *BB = 0);
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};
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} // End llvm namespace
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#endif
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