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view graal/GraalCompiler/src/com/sun/c1x/opt/InstructionSubstituter.java @ 2602:0c6564c254af
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author | Lukas Stadler <lukas.stadler@jku.at> |
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date | Fri, 06 May 2011 10:25:37 +0200 |
parents | 3fca504f28ba |
children | 3558ca7088c0 |
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/* * Copyright (c) 2009, 2011, 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.sun.c1x.opt; import com.sun.c1x.ir.*; import com.sun.c1x.value.*; import com.sun.c1x.graph.IR; /** * This class allows instructions to be substituted within an IR graph. It allows * registering substitutions and iterates over the instructions of a program and replaces * the occurrence of each instruction with its substitution, if it has one. * * @author Ben L. Titzer */ public final class InstructionSubstituter implements BlockClosure, ValueClosure { final IR ir; boolean hasSubstitution; public InstructionSubstituter(IR ir) { this.ir = ir; } public void apply(BlockBegin block) { Instruction last = null; if (block.exceptionHandlerStates() != null) { for (FrameState s : block.exceptionHandlerStates()) { s.valuesDo(this); } } for (Instruction n = block; n != null; n = last.next()) { n.allValuesDo(this); if (n.subst != null && last != null) { // this instruction has a substitution, skip it last.resetNext(n.next()); } else { last = n; } } } public void finish() { if (hasSubstitution) { ir.startBlock.iterateAnyOrder(this, false); } } public boolean hasSubst(Value i) { return i.subst != null; } public void setSubst(Value i, Value n) { if (i == n) { i.subst = null; } else { hasSubstitution = true; i.subst = n; } } public Value getSubst(Value i) { Value p = i; while (true) { if (p.subst == null) { break; } p = p.subst; } return p; } public Value apply(Value i) { if (i != null) { return getSubst(i); } return i; } }