Mercurial > hg > truffle
view graal/com.oracle.max.cri/src/com/sun/cri/ci/CiStackSlot.java @ 4149:cf4de9cc1268
Integrated latest mxtool updates.
author | Doug Simon <doug.simon@oracle.com> |
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date | Tue, 20 Dec 2011 10:36:44 +0100 |
parents | bc8527f3071c |
children | f5328dda9714 |
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/* * Copyright (c) 2010, 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.cri.ci; /** * Represents a compiler spill slot or an outgoing stack-based argument in a method's frame * or an incoming stack-based argument in a method's {@linkplain #inCallerFrame() caller's frame}. */ public final class CiStackSlot extends CiValue { /** * */ private static final long serialVersionUID = -7725071921307318433L; /** * @see CiStackSlot#index() */ private final int index; /** * Gets a {@link CiStackSlot} instance representing a stack slot in the current frame * at a given index holding a value of a given kind. * * @param kind the kind of the value stored in the stack slot * @param index the index of the stack slot */ public static CiStackSlot get(CiKind kind, int index) { return get(kind, index, false); } /** * Gets a {@link CiStackSlot} instance representing a stack slot at a given index * holding a value of a given kind. * * @param kind the kind of the value stored in the stack slot * @param index the index of the stack slot * @param inCallerFrame specifies if the slot is in the current frame or in the caller's frame */ public static CiStackSlot get(CiKind kind, int index, boolean inCallerFrame) { assert kind.stackKind() == kind; CiStackSlot[][] cache = inCallerFrame ? CALLER_FRAME_CACHE : CACHE; CiStackSlot[] slots = cache[kind.ordinal()]; CiStackSlot slot; if (index < slots.length) { slot = slots[index]; } else { slot = new CiStackSlot(kind, inCallerFrame ? -(index + 1) : index); } assert slot.inCallerFrame() == inCallerFrame; return slot; } /** * Private constructor to enforce use of {@link #get(CiKind, int)} so that the * shared instance {@linkplain #CACHE cache} is used. */ private CiStackSlot(CiKind kind, int index) { super(kind); this.index = index; } /** * Gets the index of this stack slot. If this is a spill slot or outgoing stack argument to a call, * then the index is relative to the current frame pointer. Otherwise this is an incoming stack * argument and the index is relative to the caller frame pointer. * * @return the index of this slot * @see #inCallerFrame() */ public int index() { return index < 0 ? -(index + 1) : index; } @Override public int hashCode() { return kind.ordinal() + index; } @Override public boolean equals(Object o) { if (o == this) { return true; } if (o instanceof CiStackSlot) { CiStackSlot l = (CiStackSlot) o; return l.kind == kind && l.index == index; } return false; } @Override public boolean equalsIgnoringKind(CiValue o) { if (o == this) { return true; } if (o instanceof CiStackSlot) { CiStackSlot l = (CiStackSlot) o; return l.index == index; } return false; } @Override public String name() { return (inCallerFrame() ? "caller-stack" : "stack:") + index(); } /** * Determines if this is a stack slot in the caller's frame. */ public boolean inCallerFrame() { return index < 0; } /** * Gets this stack slot used to pass an argument from the perspective of a caller. */ public CiStackSlot asOutArg() { if (inCallerFrame()) { return get(kind, index(), false); } return this; } /** * Gets this stack slot used to pass an argument from the perspective of a callee. */ public CiStackSlot asInArg() { if (!inCallerFrame()) { return get(kind, index(), true); } return this; } /** * Default size of the cache to generate per kind. */ private static final int CACHE_PER_KIND_SIZE = 100; private static final int CALLER_FRAME_CACHE_PER_KIND_SIZE = 10; /** * A cache of {@linkplain #inCallerFrame() non-caller-frame} stack slots. */ private static final CiStackSlot[][] CACHE = makeCache(CACHE_PER_KIND_SIZE, false); /** * A cache of {@linkplain #inCallerFrame() caller-frame} stack slots. */ private static final CiStackSlot[][] CALLER_FRAME_CACHE = makeCache(CALLER_FRAME_CACHE_PER_KIND_SIZE, true); private static CiStackSlot[][] makeCache(int cachePerKindSize, boolean inCallerFrame) { CiStackSlot[][] cache = new CiStackSlot[CiKind.VALUES.length][]; cache[CiKind.Illegal.ordinal()] = makeCacheForKind(CiKind.Illegal, cachePerKindSize, inCallerFrame); cache[CiKind.Int.ordinal()] = makeCacheForKind(CiKind.Int, cachePerKindSize, inCallerFrame); cache[CiKind.Long.ordinal()] = makeCacheForKind(CiKind.Long, cachePerKindSize, inCallerFrame); cache[CiKind.Float.ordinal()] = makeCacheForKind(CiKind.Float, cachePerKindSize, inCallerFrame); cache[CiKind.Double.ordinal()] = makeCacheForKind(CiKind.Double, cachePerKindSize, inCallerFrame); cache[CiKind.Object.ordinal()] = makeCacheForKind(CiKind.Object, cachePerKindSize, inCallerFrame); cache[CiKind.Jsr.ordinal()] = makeCacheForKind(CiKind.Jsr, cachePerKindSize, inCallerFrame); return cache; } /** * Creates an array of {@code CiStackSlot} objects for a given {@link CiKind}. * The {@link #index} values range from {@code 0} to {@code count - 1}. * * @param kind the {@code CiKind} of the stack slot * @param count the size of the array to create * @return the generated {@code CiStackSlot} array */ private static CiStackSlot[] makeCacheForKind(CiKind kind, int count, boolean inCallerFrame) { CiStackSlot[] slots = new CiStackSlot[count]; for (int i = 0; i < count; ++i) { slots[i] = new CiStackSlot(kind, inCallerFrame ? -(i + 1) : i); } return slots; } }