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author | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
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committer | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
commit | 554fd8c5195424bdbcabf5de30fdc183aba391bd (patch) | |
tree | 976dc5ab7fddf506dadce60ae936f43f58787092 /libjava/java/lang/VMDouble.java | |
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Diffstat (limited to 'libjava/java/lang/VMDouble.java')
-rw-r--r-- | libjava/java/lang/VMDouble.java | 111 |
1 files changed, 111 insertions, 0 deletions
diff --git a/libjava/java/lang/VMDouble.java b/libjava/java/lang/VMDouble.java new file mode 100644 index 000000000..9205eb3b3 --- /dev/null +++ b/libjava/java/lang/VMDouble.java @@ -0,0 +1,111 @@ +/* VMDouble.java -- VM Specific Double methods + Copyright (C) 2003, 2005, 2006 Free Software Foundation + +This file is part of GNU Classpath. + +GNU Classpath is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2, or (at your option) +any later version. + +GNU Classpath 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 for more details. + +You should have received a copy of the GNU General Public License +along with GNU Classpath; see the file COPYING. If not, write to the +Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA +02110-1301 USA. + +Linking this library statically or dynamically with other modules is +making a combined work based on this library. Thus, the terms and +conditions of the GNU General Public License cover the whole +combination. + +As a special exception, the copyright holders of this library give you +permission to link this library with independent modules to produce an +executable, regardless of the license terms of these independent +modules, and to copy and distribute the resulting executable under +terms of your choice, provided that you also meet, for each linked +independent module, the terms and conditions of the license of that +module. An independent module is a module which is not derived from +or based on this library. If you modify this library, you may extend +this exception to your version of the library, but you are not +obligated to do so. If you do not wish to do so, delete this +exception statement from your version. */ + +package java.lang; + +import gnu.classpath.Configuration; + +/* + * This class is a reference version, mainly for compiling a class library + * jar. It is likely that VM implementers replace this with their own + * version that can communicate effectively with the VM. + */ + +/** + * Code relocated from java.lang.Double by + * @author Dave Grove (groved@us.ibm.com) + */ +final class VMDouble +{ + /** + * Convert the double to the IEEE 754 floating-point "double format" bit + * layout. Bit 63 (the most significant) is the sign bit, bits 62-52 + * (masked by 0x7ff0000000000000L) represent the exponent, and bits 51-0 + * (masked by 0x000fffffffffffffL) are the mantissa. This function + * collapses all versions of NaN to 0x7ff8000000000000L. The result of this + * function can be used as the argument to + * <code>Double.longBitsToDouble(long)</code> to obtain the original + * <code>double</code> value. + * + * @param value the <code>double</code> to convert + * @return the bits of the <code>double</code> + * @see #longBitsToDouble(long) + */ + public static native long doubleToLongBits(double value); + + /** + * Convert the double to the IEEE 754 floating-point "double format" bit + * layout. Bit 63 (the most significant) is the sign bit, bits 62-52 + * (masked by 0x7ff0000000000000L) represent the exponent, and bits 51-0 + * (masked by 0x000fffffffffffffL) are the mantissa. This function + * leaves NaN alone, rather than collapsing to a canonical value. The + * result of this function can be used as the argument to + * <code>Double.longBitsToDouble(long)</code> to obtain the original + * <code>double</code> value. + * + * @param value the <code>double</code> to convert + * @return the bits of the <code>double</code> + * @see #longBitsToDouble(long) + */ + public static native long doubleToRawLongBits(double value); + + /** + * Convert the argument in IEEE 754 floating-point "double format" bit + * layout to the corresponding float. Bit 63 (the most significant) is the + * sign bit, bits 62-52 (masked by 0x7ff0000000000000L) represent the + * exponent, and bits 51-0 (masked by 0x000fffffffffffffL) are the mantissa. + * This function leaves NaN alone, so that you can recover the bit pattern + * with <code>Double.doubleToRawLongBits(double)</code>. + * + * @param bits the bits to convert + * @return the <code>double</code> represented by the bits + * @see #doubleToLongBits(double) + * @see #doubleToRawLongBits(double) + */ + public static native double longBitsToDouble(long bits); + + /** + * Helper method to convert to string. + * + * @param d the double to convert + * @param isFloat true if the conversion is requested by Float (results in + * fewer digits) + */ + public static native String toString(double d, boolean isFloat); + + public static native double parseDouble(String str); +} |