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 "jvm.h" 28 29 #include "JNIHelp.h" 30 31 #define NATIVE_METHOD(className, functionName, signature) \ 32 { #functionName, signature, (void*)(className ## _ ## functionName) } 33 34 35 /* 36 * Find the float corresponding to a given bit pattern 37 */ 38 JNIEXPORT jfloat JNICALL 39 Float_intBitsToFloat(JNIEnv *env, jclass unused, jint v) 40 { 41 union { 42 int i; 43 float f; 44 } u; 45 u.i = (long)v; 46 return (jfloat)u.f; 47 } 48 49 /* 50 * Find the bit pattern corresponding to a given float, NOT collapsing NaNs 51 */ 52 JNIEXPORT jint JNICALL 53 Float_floatToRawIntBits(JNIEnv *env, jclass unused, jfloat v) 54 { 55 union { 56 int i; 57 float f; 58 } u; 59 u.f = (float)v; 60 return (jint)u.i; 61 } 62 static JNINativeMethod gMethods[] = { 63 NATIVE_METHOD(Float, intBitsToFloat, "(I)F"), 64 NATIVE_METHOD(Float, floatToRawIntBits, "(F)I"), 65 }; 66 67 void register_java_lang_Float(JNIEnv* env) { 68 jniRegisterNativeMethods(env, "java/lang/Float", gMethods, NELEM(gMethods)); 69 } 70
