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authorupstream source tree <ports@midipix.org>2015-03-15 20:14:05 -0400
committerupstream source tree <ports@midipix.org>2015-03-15 20:14:05 -0400
commit554fd8c5195424bdbcabf5de30fdc183aba391bd (patch)
tree976dc5ab7fddf506dadce60ae936f43f58787092 /libjava/java/lang/VMDouble.java
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+/* 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);
+}