1 /*
2 * Copyright (c) 1997, 2005, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 #include "jni.h"
27 #include "jni_util.h"
28 #include "jlong.h"
29 #include "jvm.h"
30
31 #include <nativehelper/JNIHelp.h>
32
33 #define NATIVE_METHOD(className, functionName, signature) \
34 { #functionName, signature, (void*)(className ## _ ## functionName) }
35
36
37 /*
38 * Find the double float corresponding to a given bit pattern
39 */
40 JNIEXPORT jdouble JNICALL
Double_longBitsToDouble(JNIEnv * env,jclass unused,jlong v)41 Double_longBitsToDouble(JNIEnv *env, jclass unused, jlong v)
42 {
43 union {
44 jlong l;
45 double d;
46 } u;
47 jlong_to_jdouble_bits(&v);
48 u.l = v;
49 return (jdouble)u.d;
50 }
51
52 /*
53 * Find the bit pattern corresponding to a given double float, NOT collapsing NaNs
54 */
55 JNIEXPORT jlong JNICALL
Double_doubleToRawLongBits(JNIEnv * env,jclass unused,jdouble v)56 Double_doubleToRawLongBits(JNIEnv *env, jclass unused, jdouble v)
57 {
58 union {
59 jlong l;
60 double d;
61 } u;
62 jdouble_to_jlong_bits(&v);
63 u.d = (double)v;
64 return u.l;
65 }
66 static JNINativeMethod gMethods[] = {
67 NATIVE_METHOD(Double, longBitsToDouble, "(J)D"),
68 NATIVE_METHOD(Double, doubleToRawLongBits, "(D)J"),
69 };
70
register_java_lang_Double(JNIEnv * env)71 void register_java_lang_Double(JNIEnv* env) {
72 jniRegisterNativeMethods(env, "java/lang/Double", gMethods, NELEM(gMethods));
73 }
74