diff options
author | Mark Wielaard <mark@klomp.org> | 2003-07-16 12:21:07 +0000 |
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committer | Mark Wielaard <mark@klomp.org> | 2003-07-16 12:21:07 +0000 |
commit | 4add1720a6c40699717b90347f457dbb9e635662 (patch) | |
tree | 7b1d71ebcfe4283103d56156eaae372c2533a030 /vm/reference/java/lang/VMFloat.java | |
parent | f2aa63a2800d793a3664f54ff3b0e3a33f1206cd (diff) | |
download | classpath-4add1720a6c40699717b90347f457dbb9e635662.tar.gz |
2003-07-16 David Grove <groved@us.ibm.com
* java/lang/Double.java (doubleToLongBits): No longer native,
delegates to VMDouble.
(doubleToRawLongBits): Likewise.
(longBitsToDouble): Likewise.
* java/lang/Float.java (static): Moved to VMFloat.
(floatToIntBits) No longer native, delegates to VMFloat.
(floatToRawIntBits): Likewise.
(intBitsToFloat): Likewise.
* vm/reference/java/lang/VMDouble.java: New class.
* vm/reference/java/lang/VMFloat.java: New class.
* native/jni/java-lang/Makefile.am (libjavalang_la_SOURCES): Remove
java_lang_Float.c, add java_lang_VMFloat.c and java_lang_VMDouble.c.
* native/jni/java-lang/java_lang_Double.c (doubleToLongBits):
Removed, moved to java_lang_VMDouble.c.
(doubleToRawLongBits): Likewise.
(longBitsToDouble): Likewise.
* native/jni/java-lang/java_lang_Float.c: Removed file.
* native/jni/java-lang/java_lang_VMDouble.c: New file.
* native/jni/java-lang/java_lang_VMFloat.c: New file.
* include/java_lang_Double.h: Regenerated.
* include/java_lang_Float.h: Removed.
* include/java_lang_VMDouble.h: New file.
* include/java_lang_VMFloat.h: New file.
* NEWS: Describe new VM Float/Double conversion methods.
Diffstat (limited to 'vm/reference/java/lang/VMFloat.java')
-rw-r--r-- | vm/reference/java/lang/VMFloat.java | 111 |
1 files changed, 111 insertions, 0 deletions
diff --git a/vm/reference/java/lang/VMFloat.java b/vm/reference/java/lang/VMFloat.java new file mode 100644 index 000000000..59301c16d --- /dev/null +++ b/vm/reference/java/lang/VMFloat.java @@ -0,0 +1,111 @@ +/* VMFloat.java -- VM Specific Float methods + Copyright (C) 2003 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., 59 Temple Place, Suite 330, Boston, MA +02111-1307 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.Float by + * @author Dave Grove <groved@us.ibm.com> + */ +final class VMFloat +{ + + /** + * Load native routines necessary for this class. + */ + static + { + if (Configuration.INIT_LOAD_LIBRARY) + { + System.loadLibrary("javalang"); + } + } + + /** + * Convert the float to the IEEE 754 floating-point "single format" bit + * layout. Bit 31 (the most significant) is the sign bit, bits 30-23 + * (masked by 0x7f800000) represent the exponent, and bits 22-0 + * (masked by 0x007fffff) are the mantissa. This function collapses all + * versions of NaN to 0x7fc00000. The result of this function can be used + * as the argument to <code>Float.intBitsToFloat(int)</code> to obtain the + * original <code>float</code> value. + * + * @param value the <code>float</code> to convert + * @return the bits of the <code>float</code> + * @see #intBitsToFloat(int) + */ + static native int floatToIntBits(float value); + + /** + * Convert the float to the IEEE 754 floating-point "single format" bit + * layout. Bit 31 (the most significant) is the sign bit, bits 30-23 + * (masked by 0x7f800000) represent the exponent, and bits 22-0 + * (masked by 0x007fffff) 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>Float.intBitsToFloat(int)</code> to + * obtain the original <code>float</code> value. + * + * @param value the <code>float</code> to convert + * @return the bits of the <code>float</code> + * @see #intBitsToFloat(int) + */ + static native int floatToRawIntBits(float value); + + /** + * Convert the argument in IEEE 754 floating-point "single format" bit + * layout to the corresponding float. Bit 31 (the most significant) is the + * sign bit, bits 30-23 (masked by 0x7f800000) represent the exponent, and + * bits 22-0 (masked by 0x007fffff) are the mantissa. This function leaves + * NaN alone, so that you can recover the bit pattern with + * <code>Float.floatToRawIntBits(float)</code>. + * + * @param bits the bits to convert + * @return the <code>float</code> represented by the bits + * @see #floatToIntBits(float) + * @see #floatToRawIntBits(float) + */ + static native float intBitsToFloat(int bits); + +} // class VMFloat |