mirror of git://gcc.gnu.org/git/gcc.git
123 lines
4.3 KiB
Java
123 lines
4.3 KiB
Java
/* VMDouble.java -- VM Specific Double methods
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Copyright (C) 2003, 2005, 2010 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package java.lang;
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import gnu.classpath.Configuration;
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/*
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* This class is a reference version, mainly for compiling a class library
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* jar. It is likely that VM implementers replace this with their own
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* version that can communicate effectively with the VM.
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*/
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/**
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* Code relocated from java.lang.Double by
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* @author Dave Grove (groved@us.ibm.com)
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*/
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final class VMDouble
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{
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/**
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* Load native routines necessary for this class.
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*/
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static
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{
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if (Configuration.INIT_LOAD_LIBRARY)
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{
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System.loadLibrary("javalang");
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}
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initIDs();
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}
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private VMDouble() {} // Prohibits instantiation.
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/**
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* Convert the double to the IEEE 754 floating-point "double format" bit
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* layout. Bit 63 (the most significant) is the sign bit, bits 62-52
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* (masked by 0x7ff0000000000000L) represent the exponent, and bits 51-0
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* (masked by 0x000fffffffffffffL) are the mantissa. This function
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* leaves NaN alone, rather than collapsing to a canonical value. The
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* result of this function can be used as the argument to
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* <code>Double.longBitsToDouble(long)</code> to obtain the original
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* <code>double</code> value.
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*
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* @param value the <code>double</code> to convert
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* @return the bits of the <code>double</code>
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* @see #longBitsToDouble(long)
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*/
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static native long doubleToRawLongBits(double value);
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/**
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* Convert the argument in IEEE 754 floating-point "double format" bit
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* layout to the corresponding float. Bit 63 (the most significant) is the
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* sign bit, bits 62-52 (masked by 0x7ff0000000000000L) represent the
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* exponent, and bits 51-0 (masked by 0x000fffffffffffffL) are the mantissa.
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* This function leaves NaN alone, so that you can recover the bit pattern
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* with <code>Double.doubleToRawLongBits(double)</code>.
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*
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* @param bits the bits to convert
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* @return the <code>double</code> represented by the bits
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* @see #doubleToLongBits(double)
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* @see #doubleToRawLongBits(double)
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*/
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static native double longBitsToDouble(long bits);
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/**
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* Helper method to convert to string.
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*
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* @param d the double to convert
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* @param isFloat true if the conversion is requested by Float (results in
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* fewer digits)
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*/
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static native String toString(double d, boolean isFloat);
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/**
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* Initialize JNI cache. This method is called only by the
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* static initializer when using JNI.
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*/
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private static native void initIDs();
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/**
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* Parse the specified String as a double.
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* @throws NumberFormatException if str cannot be parsed
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* @throws NullPointerException if str is null
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*/
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static native double parseDouble(String str);
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}
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