Mercurial > hg > truffle
view graal/com.oracle.max.cri/src/com/oracle/max/cri/ci/CiStackSlot.java @ 5458:7accd1838b1b
quick fix for postdominator calculation
author | Lukas Stadler <lukas.stadler@jku.at> |
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date | Thu, 31 May 2012 18:23:16 +0200 |
parents | 1e3ecb08767d |
children | 438ab53efdd0 |
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/* * Copyright (c) 2010, 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.max.cri.ci; import static com.oracle.max.cri.ci.CiKind.*; /** * 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; private final int offset; private final boolean addFrameSize; /** * 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 offset The offset of the stack slot (in bytes) * @param inCallerFrame Specifies if the offset is relative to the stack pointer, * or the beginning of the frame (stack pointer + total frame size). */ public static CiStackSlot get(CiKind kind, int offset, boolean addFrameSize) { assert kind.stackKind() == kind; assert addFrameSize || offset >= 0; if (offset % CACHE_GRANULARITY == 0) { CiStackSlot[][] cache; int index = offset / CACHE_GRANULARITY; if (!addFrameSize) { cache = OUT_CACHE; } else if (offset >= 0) { cache = IN_CACHE; } else { cache = SPILL_CACHE; index = -index; } CiStackSlot[] slots = cache[kind.ordinal()]; if (index < slots.length) { CiStackSlot slot = slots[index]; assert slot.kind == kind && slot.offset == offset && slot.addFrameSize == addFrameSize; return slot; } } return new CiStackSlot(kind, offset, addFrameSize); } /** * Private constructor to enforce use of {@link #get()} so that a cache can be used. */ private CiStackSlot(CiKind kind, int offset, boolean addFrameSize) { super(kind); this.offset = offset; this.addFrameSize = addFrameSize; } /** * Gets the offset of this stack slot, relative to the stack pointer. * @return The offset of this slot (in bytes). */ public int offset(int totalFrameSize) { assert totalFrameSize > 0 || !addFrameSize; int result = offset + (addFrameSize ? totalFrameSize : 0); assert result >= 0; return result; } public boolean inCallerFrame() { return addFrameSize && offset >= 0; } public int rawOffset() { return offset; } public boolean rawAddFrameSize() { return addFrameSize; } @Override public int hashCode() { return kind.ordinal() ^ (offset << 4) ^ (addFrameSize ? 15 : 0); } @Override public boolean equals(Object o) { if (o == this) { return true; } if (o instanceof CiStackSlot) { CiStackSlot l = (CiStackSlot) o; return l.kind == kind && l.offset == offset && l.addFrameSize == addFrameSize; } return false; } @Override public String toString() { if (!addFrameSize) { return "out:" + offset + kindSuffix(); } else if (offset >= 0) { return "in:" + offset + kindSuffix(); } else { return "stack:" + (-offset) + kindSuffix(); } } /** * Gets this stack slot used to pass an argument from the perspective of a caller. */ public CiStackSlot asOutArg() { assert offset >= 0; if (addFrameSize) { return get(kind, offset, false); } return this; } /** * Gets this stack slot used to pass an argument from the perspective of a callee. */ public CiStackSlot asInArg() { assert offset >= 0; if (!addFrameSize) { return get(kind, offset, true); } return this; } private static final int CACHE_GRANULARITY = 8; private static final int SPILL_CACHE_PER_KIND_SIZE = 100; private static final int PARAM_CACHE_PER_KIND_SIZE = 10; private static final CiStackSlot[][] SPILL_CACHE = makeCache(SPILL_CACHE_PER_KIND_SIZE, -1, true); private static final CiStackSlot[][] IN_CACHE = makeCache(PARAM_CACHE_PER_KIND_SIZE, 1, true); private static final CiStackSlot[][] OUT_CACHE = makeCache(PARAM_CACHE_PER_KIND_SIZE, 1, false); private static CiStackSlot[][] makeCache(int cachePerKindSize, int sign, boolean addFrameSize) { CiStackSlot[][] cache = new CiStackSlot[CiKind.VALUES.length][]; for (CiKind kind : new CiKind[] {Illegal, Int, Long, Float, Double, Object, Jsr}) { CiStackSlot[] slots = new CiStackSlot[cachePerKindSize]; for (int i = 0; i < cachePerKindSize; i++) { slots[i] = new CiStackSlot(kind, sign * i * CACHE_GRANULARITY, addFrameSize); } cache[kind.ordinal()] = slots; } return cache; } }