Mercurial > hg > graal-compiler
view graal/com.oracle.graal.compiler/src/com/oracle/graal/compiler/phases/CullFrameStatesPhase.java @ 6409:823a2978e7ba
Lowering of call targets to direct / indirect call targets
author | Christian Wimmer <christian.wimmer@oracle.com> |
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date | Fri, 14 Sep 2012 14:45:47 -0700 |
parents | 1436de7b7cab |
children |
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/* * Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ package com.oracle.graal.compiler.phases; import java.util.*; import com.oracle.graal.compiler.graph.*; import com.oracle.graal.debug.*; import com.oracle.graal.nodes.*; import com.oracle.graal.nodes.util.*; /** * This phase culls unused FrameStates from the graph. * It does a post order iteration over the graph, and */ public class CullFrameStatesPhase extends Phase { private static final DebugMetric metricFrameStatesCulled = Debug.metric("FrameStatesCulled"); private static final DebugMetric metricMergesTraversed = Debug.metric("MergesTraversed"); @Override protected void run(StructuredGraph graph) { new CullFrameStates(graph.start(), new State(null)).apply(); } public static class State implements MergeableState<State> { private FrameState lastFrameState; public State(FrameState lastFrameState) { this.lastFrameState = lastFrameState; } @Override public boolean merge(MergeNode merge, List<State> withStates) { FrameState stateAfter = merge.stateAfter(); if (merge instanceof LoopBeginNode) { if (stateAfter != null) { lastFrameState = stateAfter; } return true; } metricMergesTraversed.increment(); if (stateAfter != null) { for (State other : withStates) { if (other.lastFrameState != lastFrameState) { lastFrameState = stateAfter; return true; } } metricFrameStatesCulled.increment(); merge.setStateAfter(null); if (stateAfter.usages().isEmpty()) { GraphUtil.killWithUnusedFloatingInputs(stateAfter); } } return true; } @Override public void loopBegin(LoopBeginNode loopBegin) { } @Override public void loopEnds(LoopBeginNode loopBegin, List<State> loopEndStates) { } @Override public void afterSplit(FixedNode node) { } @Override public State clone() { return new State(lastFrameState); } } public static class CullFrameStates extends PostOrderNodeIterator<State> { public CullFrameStates(FixedNode start, State initialState) { super(start, initialState); } @Override protected void node(FixedNode node) { if (node instanceof StateSplit) { FrameState stateAfter = ((StateSplit) node).stateAfter(); if (stateAfter != null) { state.lastFrameState = stateAfter; } } } } }