mirror of
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125 lines
4.2 KiB
C++
125 lines
4.2 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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* vim: set ts=8 sts=4 et sw=4 tw=99:
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef jit_ValueNumbering_h
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#define jit_ValueNumbering_h
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#include "jit/JitAllocPolicy.h"
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#include "js/HashTable.h"
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namespace js {
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namespace jit {
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class MDefinition;
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class MBasicBlock;
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class MIRGraph;
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class MPhi;
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class MIRGenerator;
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class MResumePoint;
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class ValueNumberer
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{
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// Value numbering data.
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class VisibleValues
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{
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// Hash policy for ValueSet.
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struct ValueHasher
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{
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typedef const MDefinition* Lookup;
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typedef MDefinition* Key;
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static HashNumber hash(Lookup ins);
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static bool match(Key k, Lookup l);
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static void rekey(Key& k, Key newKey);
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};
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typedef HashSet<MDefinition*, ValueHasher, JitAllocPolicy> ValueSet;
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ValueSet set_; // Set of visible values
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public:
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explicit VisibleValues(TempAllocator& alloc);
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bool init();
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typedef ValueSet::Ptr Ptr;
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typedef ValueSet::AddPtr AddPtr;
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Ptr findLeader(const MDefinition* def) const;
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AddPtr findLeaderForAdd(MDefinition* def);
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bool add(AddPtr p, MDefinition* def);
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void overwrite(AddPtr p, MDefinition* def);
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void forget(const MDefinition* def);
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void clear();
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#ifdef DEBUG
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bool has(const MDefinition* def) const;
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#endif
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};
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typedef Vector<MBasicBlock*, 4, JitAllocPolicy> BlockWorklist;
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typedef Vector<MDefinition*, 4, JitAllocPolicy> DefWorklist;
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MIRGenerator* const mir_;
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MIRGraph& graph_;
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VisibleValues values_; // Numbered values
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DefWorklist deadDefs_; // Worklist for deleting values
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BlockWorklist remainingBlocks_; // Blocks remaining with fewer preds
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MDefinition* nextDef_; // The next definition; don't discard
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size_t totalNumVisited_; // The number of blocks visited
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bool rerun_; // Should we run another GVN iteration?
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bool blocksRemoved_; // Have any blocks been removed?
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bool updateAliasAnalysis_; // Do we care about AliasAnalysis?
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bool dependenciesBroken_; // Have we broken AliasAnalysis?
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bool hasOSRFixups_; // Have we created any OSR fixup blocks?
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enum UseRemovedOption {
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DontSetUseRemoved,
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SetUseRemoved
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};
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bool handleUseReleased(MDefinition* def, UseRemovedOption useRemovedOption);
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bool discardDefsRecursively(MDefinition* def);
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bool releaseResumePointOperands(MResumePoint* resume);
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bool releaseAndRemovePhiOperands(MPhi* phi);
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bool releaseOperands(MDefinition* def);
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bool discardDef(MDefinition* def);
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bool processDeadDefs();
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bool fixupOSROnlyLoop(MBasicBlock* block, MBasicBlock* backedge);
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bool removePredecessorAndDoDCE(MBasicBlock* block, MBasicBlock* pred, size_t predIndex);
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bool removePredecessorAndCleanUp(MBasicBlock* block, MBasicBlock* pred);
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MDefinition* simplified(MDefinition* def) const;
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MDefinition* leader(MDefinition* def);
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bool hasLeader(const MPhi* phi, const MBasicBlock* phiBlock) const;
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bool loopHasOptimizablePhi(MBasicBlock* header) const;
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bool visitDefinition(MDefinition* def);
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bool visitControlInstruction(MBasicBlock* block, const MBasicBlock* root);
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bool visitUnreachableBlock(MBasicBlock* block);
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bool visitBlock(MBasicBlock* block, const MBasicBlock* root);
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bool visitDominatorTree(MBasicBlock* root);
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bool visitGraph();
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bool cleanupOSRFixups();
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public:
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ValueNumberer(MIRGenerator* mir, MIRGraph& graph);
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bool init();
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enum UpdateAliasAnalysisFlag {
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DontUpdateAliasAnalysis,
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UpdateAliasAnalysis
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};
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// Optimize the graph, performing expression simplification and
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// canonicalization, eliminating statically fully-redundant expressions,
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// deleting dead instructions, and removing unreachable blocks.
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bool run(UpdateAliasAnalysisFlag updateAliasAnalysis);
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};
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} // namespace jit
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} // namespace js
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#endif /* jit_ValueNumbering_h */
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