Mercurial > hg > truffle
view graal/com.oracle.graal.api.meta/src/com/oracle/graal/api/meta/Constant.java @ 6718:cce59a7ee92c
Avoids stripping libjvm.so when building debug on Solaris (.debuginfo files don't work well with Oracle Solaris Studio 12.3's solaris).
author | Laurent Daynes <Laurent.Daynes@oracle.com> |
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date | Thu, 15 Nov 2012 10:25:46 +0100 |
parents | 2463eb24b644 |
children | a5156d39b622 |
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/* * Copyright (c) 2009, 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.api.meta; /** * Represents a constant (boxed) value, such as an integer, floating point number, or object reference, within the * compiler and across the compiler/runtime interface. Exports a set of {@code Constant} instances that represent * frequently used constant values, such as {@link #NULL_OBJECT}. */ public final class Constant extends Value { private static final long serialVersionUID = -6355452536852663986L; private static final Constant[] INT_CONSTANT_CACHE = new Constant[100]; static { for (int i = 0; i < INT_CONSTANT_CACHE.length; ++i) { INT_CONSTANT_CACHE[i] = new Constant(Kind.Int, i); } } public static final Constant NULL_OBJECT = new Constant(Kind.Object, null); public static final Constant INT_MINUS_1 = new Constant(Kind.Int, -1); public static final Constant INT_0 = forInt(0); public static final Constant INT_1 = forInt(1); public static final Constant INT_2 = forInt(2); public static final Constant INT_3 = forInt(3); public static final Constant INT_4 = forInt(4); public static final Constant INT_5 = forInt(5); public static final Constant LONG_0 = new Constant(Kind.Long, 0L); public static final Constant LONG_1 = new Constant(Kind.Long, 1L); public static final Constant FLOAT_0 = new Constant(Kind.Float, Float.floatToRawIntBits(0.0F)); public static final Constant FLOAT_1 = new Constant(Kind.Float, Float.floatToRawIntBits(1.0F)); public static final Constant FLOAT_2 = new Constant(Kind.Float, Float.floatToRawIntBits(2.0F)); public static final Constant DOUBLE_0 = new Constant(Kind.Double, Double.doubleToRawLongBits(0.0D)); public static final Constant DOUBLE_1 = new Constant(Kind.Double, Double.doubleToRawLongBits(1.0D)); public static final Constant TRUE = new Constant(Kind.Boolean, 1L); public static final Constant FALSE = new Constant(Kind.Boolean, 0L); static { assert FLOAT_0 != forFloat(-0.0F) : "Constant for 0.0f must be different from -0.0f"; assert DOUBLE_0 != forDouble(-0.0d) : "Constant for 0.0d must be different from -0.0d"; assert NULL_OBJECT.isNull(); } /** * The boxed object value. This is ignored iff {@code !kind.isObject()}. */ private final Object object; /** * The boxed primitive value as a {@code long}. This is ignored iff {@code kind.isObject()}. For {@code float} and * {@code double} values, this value is the result of {@link Float#floatToRawIntBits(float)} and * {@link Double#doubleToRawLongBits(double)} respectively. */ private final long primitive; /** * Create a new constant represented by the specified object reference. * * @param kind the type of this constant * @param object the value of this constant */ private Constant(Kind kind, Object object) { super(kind); this.object = object; this.primitive = 0L; } /** * Create a new constant represented by the specified primitive. * * @param kind the type of this constant * @param primitive the value of this constant */ public Constant(Kind kind, long primitive) { super(kind); this.object = null; this.primitive = primitive; } /** * Checks whether this constant is non-null. * * @return {@code true} if this constant is a primitive, or an object constant that is not null */ public boolean isNonNull() { return !getKind().isObject() || object != null; } /** * Checks whether this constant is null. * * @return {@code true} if this constant is the null constant */ public boolean isNull() { return getKind().isObject() && object == null; } @Override public String toString() { return getKind().getJavaName() + "[" + getKind().format(asBoxedValue()) + (getKind() != Kind.Object ? "|0x" + Long.toHexString(primitive) : "") + "]"; } /** * Returns the value of this constant as a boxed Java value. * * @return the value of this constant */ public Object asBoxedValue() { switch (getKind()) { case Byte: return (byte) asInt(); case Boolean: return asInt() == 0 ? Boolean.FALSE : Boolean.TRUE; case Short: return (short) asInt(); case Char: return (char) asInt(); case Jsr: return (int) primitive; case Int: return asInt(); case Long: return asLong(); case Float: return asFloat(); case Double: return asDouble(); case Object: return object; } throw new IllegalArgumentException(); } private boolean valueEqual(Constant other, boolean ignoreKind) { // must have equivalent kinds to be equal if (!ignoreKind && getKind() != other.getKind()) { return false; } if (getKind().isObject()) { return object == other.object; } return primitive == other.primitive; } /** * Converts this constant to a primitive int. * * @return the int value of this constant */ public int asInt() { if (getKind().getStackKind().isStackInt() || getKind().isJsr()) { return (int) primitive; } throw new Error("Constant is not int: " + this); } /** * Converts this constant to a primitive boolean. * * @return the boolean value of this constant */ public boolean asBoolean() { if (getKind() == Kind.Boolean) { return primitive != 0L; } throw new Error("Constant is not boolean: " + this); } /** * Converts this constant to a primitive long. * * @return the long value of this constant */ public long asLong() { switch (getKind().getStackKind()) { case Jsr: case Int: case Long: return primitive; case Float: return (long) asFloat(); case Double: return (long) asDouble(); default: throw new Error("Constant is not long: " + this); } } /** * Converts this constant to a primitive float. * * @return the float value of this constant */ public float asFloat() { if (getKind().isFloat()) { return Float.intBitsToFloat((int) primitive); } throw new Error("Constant is not float: " + this); } /** * Converts this constant to a primitive double. * * @return the double value of this constant */ public double asDouble() { if (getKind().isFloat()) { return Float.intBitsToFloat((int) primitive); } if (getKind().isDouble()) { return Double.longBitsToDouble(primitive); } throw new Error("Constant is not double: " + this); } /** * Converts this constant to the object reference it represents. * * @return the object which this constant represents */ public Object asObject() { if (getKind().isObject()) { return object; } throw new Error("Constant is not object: " + this); } /** * Converts this constant to the jsr reference it represents. * * @return the object which this constant represents */ public int asJsr() { if (getKind().isJsr()) { return (int) primitive; } throw new Error("Constant is not jsr: " + this); } /** * Unchecked access to a primitive value. */ public long asPrimitive() { if (getKind().isObject()) { throw new Error("Constant is not primitive: " + this); } return primitive; } /** * Computes the hashcode of this constant. * * @return a suitable hashcode for this constant */ @Override public int hashCode() { if (getKind().isObject()) { return System.identityHashCode(object); } return (int) primitive; } /** * Checks whether this constant equals another object. This is only true if the other object is a constant and has * the same value. * * @param o the object to compare equality * @return {@code true} if this constant is equivalent to the specified object */ @Override public boolean equals(Object o) { return o == this || o instanceof Constant && valueEqual((Constant) o, false); } /** * Creates a boxed double constant. * * @param d the double value to box * @return a boxed copy of {@code value} */ public static Constant forDouble(double d) { if (Double.compare(0.0D, d) == 0) { return DOUBLE_0; } if (Double.compare(d, 1.0D) == 0) { return DOUBLE_1; } return new Constant(Kind.Double, Double.doubleToRawLongBits(d)); } /** * Creates a boxed float constant. * * @param f the float value to box * @return a boxed copy of {@code value} */ public static Constant forFloat(float f) { if (Float.compare(f, 0.0F) == 0) { return FLOAT_0; } if (Float.compare(f, 1.0F) == 0) { return FLOAT_1; } if (Float.compare(f, 2.0F) == 0) { return FLOAT_2; } return new Constant(Kind.Float, Float.floatToRawIntBits(f)); } /** * Creates a boxed long constant. * * @param i the long value to box * @return a boxed copy of {@code value} */ public static Constant forLong(long i) { return i == 0 ? LONG_0 : i == 1 ? LONG_1 : new Constant(Kind.Long, i); } /** * Creates a boxed integer constant. * * @param i the integer value to box * @return a boxed copy of {@code value} */ public static Constant forInt(int i) { if (i == -1) { return INT_MINUS_1; } if (i >= 0 && i < INT_CONSTANT_CACHE.length) { return INT_CONSTANT_CACHE[i]; } return new Constant(Kind.Int, i); } /** * Creates a boxed byte constant. * * @param i the byte value to box * @return a boxed copy of {@code value} */ public static Constant forByte(byte i) { return new Constant(Kind.Byte, i); } /** * Creates a boxed boolean constant. * * @param i the boolean value to box * @return a boxed copy of {@code value} */ public static Constant forBoolean(boolean i) { return i ? TRUE : FALSE; } /** * Creates a boxed char constant. * * @param i the char value to box * @return a boxed copy of {@code value} */ public static Constant forChar(char i) { return new Constant(Kind.Char, i); } /** * Creates a boxed short constant. * * @param i the short value to box * @return a boxed copy of {@code value} */ public static Constant forShort(short i) { return new Constant(Kind.Short, i); } /** * Creates a boxed address (jsr/ret address) constant. * * @param i the address value to box * @return a boxed copy of {@code value} */ public static Constant forJsr(int i) { return new Constant(Kind.Jsr, i); } /** * Creates a boxed object constant. * * @param o the object value to box * @return a boxed copy of {@code value} */ public static Constant forObject(Object o) { if (o == null) { return NULL_OBJECT; } return new Constant(Kind.Object, o); } /** * Creates a boxed constant for the given kind from an Object. The object needs to be of the Java boxed type * corresponding to the kind. * * @param kind the kind of the constant to create * @param value the Java boxed value: a {@link Byte} instance for {@link Kind#Byte}, etc. * @return the boxed copy of {@code value} */ public static Constant forBoxed(Kind kind, Object value) { switch (kind) { case Boolean: return forBoolean((Boolean) value); case Byte: return forByte((Byte) value); case Char: return forChar((Character) value); case Short: return forShort((Short) value); case Int: return forInt((Integer) value); case Long: return forLong((Long) value); case Float: return forFloat((Float) value); case Double: return forDouble((Double) value); case Object: return forObject(value); default: throw new RuntimeException("cannot create Constant for boxed " + kind + " value"); } } }