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/*
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* Copyright (c) 2010, 2016, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package jdk.vm.ci.code;
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import jdk.vm.ci.meta.AllocatableValue;
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import jdk.vm.ci.meta.ValueKind;
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/**
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* Represents a compiler spill slot or an outgoing stack-based argument in a method's frame or an
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* incoming stack-based argument in a method's {@linkplain #isInCallerFrame() caller's frame}.
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*/
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public final class StackSlot extends AllocatableValue {
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private final int offset;
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private final boolean addFrameSize;
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/**
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* Gets a {@link StackSlot} instance representing a stack slot at a given index holding a value
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* of a given kind.
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*
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* @param kind The kind of the value stored in the stack slot.
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* @param offset The offset of the stack slot (in bytes)
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* @param addFrameSize Specifies if the offset is relative to the stack pointer, or the
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* beginning of the frame (stack pointer + total frame size).
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*/
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public static StackSlot get(ValueKind<?> kind, int offset, boolean addFrameSize) {
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assert addFrameSize || offset >= 0;
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return new StackSlot(kind, offset, addFrameSize);
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}
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/**
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* Private constructor to enforce use of {@link #get(ValueKind, int, boolean)} so that a cache
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* can be used.
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*/
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private StackSlot(ValueKind<?> kind, int offset, boolean addFrameSize) {
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super(kind);
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this.offset = offset;
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this.addFrameSize = addFrameSize;
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}
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/**
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* Gets the offset of this stack slot, relative to the stack pointer.
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*
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* @return The offset of this slot (in bytes).
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*/
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public int getOffset(int totalFrameSize) {
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assert totalFrameSize > 0 || !addFrameSize;
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int result = offset + (addFrameSize ? totalFrameSize : 0);
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assert result >= 0;
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return result;
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}
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public boolean isInCallerFrame() {
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return addFrameSize && offset >= 0;
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}
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public int getRawOffset() {
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return offset;
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}
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public boolean getRawAddFrameSize() {
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return addFrameSize;
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}
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@Override
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public String toString() {
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if (!addFrameSize) {
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return "out:" + offset + getKindSuffix();
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} else if (offset >= 0) {
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return "in:" + offset + getKindSuffix();
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} else {
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return "stack:" + (-offset) + getKindSuffix();
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}
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}
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/**
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* Gets this stack slot used to pass an argument from the perspective of a caller.
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*/
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public StackSlot asOutArg() {
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assert offset >= 0;
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if (addFrameSize) {
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return get(getValueKind(), offset, false);
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}
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return this;
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}
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/**
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* Gets this stack slot used to pass an argument from the perspective of a callee.
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*/
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public StackSlot asInArg() {
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assert offset >= 0;
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if (!addFrameSize) {
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return get(getValueKind(), offset, true);
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}
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return this;
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}
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@Override
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public int hashCode() {
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final int prime = 37;
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int result = super.hashCode();
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result = prime * result + (addFrameSize ? 1231 : 1237);
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result = prime * result + offset;
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return result;
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}
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@Override
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public boolean equals(Object obj) {
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if (obj instanceof StackSlot) {
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StackSlot other = (StackSlot) obj;
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return super.equals(obj) && addFrameSize == other.addFrameSize && offset == other.offset;
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}
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return false;
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}
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}
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