1 /* 2 * Copyright (c) 1994, 2019, 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 /*- 27 * Implementation of class Class 28 * 29 * former threadruntime.c, Sun Sep 22 12:09:39 1991 30 */ 31 32 #include <string.h> 33 #include <stdlib.h> 34 35 #include "jni.h" 36 #include "jni_util.h" 37 #include "jvm.h" 38 #include "check_classname.h" 39 #include "java_lang_Class.h" 40 41 #define OBJ "Ljava/lang/Object;" 42 #define CLS "Ljava/lang/Class;" 43 #define CPL "Ljdk/internal/reflect/ConstantPool;" 44 #define STR "Ljava/lang/String;" 45 #define FLD "Ljava/lang/reflect/Field;" 46 #define MHD "Ljava/lang/reflect/Method;" 47 #define CTR "Ljava/lang/reflect/Constructor;" 48 #define PD "Ljava/security/ProtectionDomain;" 49 #define BA "[B" 50 51 static JNINativeMethod methods[] = { 52 {"initClassName", "()" STR, (void *)&JVM_InitClassName}, 53 {"getSuperclass", "()" CLS, NULL}, 54 {"getInterfaces0", "()[" CLS, (void *)&JVM_GetClassInterfaces}, 55 {"isInterface", "()Z", (void *)&JVM_IsInterface}, 56 {"getSigners", "()[" OBJ, (void *)&JVM_GetClassSigners}, 57 {"setSigners", "([" OBJ ")V", (void *)&JVM_SetClassSigners}, 58 {"isArray", "()Z", (void *)&JVM_IsArrayClass}, 59 {"isHiddenClass", "()Z", (void *)&JVM_IsHiddenClass}, 60 {"isPrimitive", "()Z", (void *)&JVM_IsPrimitiveClass}, 61 {"getModifiers", "()I", (void *)&JVM_GetClassModifiers}, 62 {"getDeclaredFields0","(Z)[" FLD, (void *)&JVM_GetClassDeclaredFields}, 63 {"getDeclaredMethods0","(Z)[" MHD, (void *)&JVM_GetClassDeclaredMethods}, 64 {"getDeclaredConstructors0","(Z)[" CTR, (void *)&JVM_GetClassDeclaredConstructors}, 65 {"getProtectionDomain0", "()" PD, (void *)&JVM_GetProtectionDomain}, 66 {"getDeclaredClasses0", "()[" CLS, (void *)&JVM_GetDeclaredClasses}, 67 {"getDeclaringClass0", "()" CLS, (void *)&JVM_GetDeclaringClass}, 68 {"getSimpleBinaryName0", "()" STR, (void *)&JVM_GetSimpleBinaryName}, 69 {"getGenericSignature0", "()" STR, (void *)&JVM_GetClassSignature}, 70 {"getRawAnnotations", "()" BA, (void *)&JVM_GetClassAnnotations}, 71 {"getConstantPool", "()" CPL, (void *)&JVM_GetClassConstantPool}, 72 {"desiredAssertionStatus0","("CLS")Z", (void *)&JVM_DesiredAssertionStatus}, 73 {"getEnclosingMethod0", "()[" OBJ, (void *)&JVM_GetEnclosingMethodInfo}, 74 {"getRawTypeAnnotations", "()" BA, (void *)&JVM_GetClassTypeAnnotations}, 75 {"getNestHost0", "()" CLS, (void *)&JVM_GetNestHost}, 76 {"getNestMembers0", "()[" CLS, (void *)&JVM_GetNestMembers}, 77 }; 78 79 #undef OBJ 80 #undef CLS 81 #undef STR 82 #undef FLD 83 #undef MHD 84 #undef CTR 85 #undef PD 86 87 JNIEXPORT void JNICALL 88 Java_java_lang_Class_registerNatives(JNIEnv *env, jclass cls) 89 { 90 methods[1].fnPtr = (void *)(*env)->GetSuperclass; 91 (*env)->RegisterNatives(env, cls, methods, 92 sizeof(methods)/sizeof(JNINativeMethod)); 93 } 94 95 JNIEXPORT jclass JNICALL 96 Java_java_lang_Class_forName0(JNIEnv *env, jclass this, jstring classname, 97 jboolean initialize, jobject loader, jclass caller) 98 { 99 char *clname; 100 jclass cls = 0; 101 char buf[128]; 102 jsize len; 103 jsize unicode_len; 104 105 if (classname == NULL) { 106 JNU_ThrowNullPointerException(env, 0); 107 return 0; 108 } 109 110 len = (*env)->GetStringUTFLength(env, classname); 111 unicode_len = (*env)->GetStringLength(env, classname); 112 if (len >= (jsize)sizeof(buf)) { 113 clname = malloc(len + 1); 114 if (clname == NULL) { 115 JNU_ThrowOutOfMemoryError(env, NULL); 116 return NULL; 117 } 118 } else { 119 clname = buf; 120 } 121 (*env)->GetStringUTFRegion(env, classname, 0, unicode_len, clname); 122 123 if (verifyFixClassname(clname) == JNI_TRUE) { 124 /* slashes present in clname, use name b4 translation for exception */ 125 (*env)->GetStringUTFRegion(env, classname, 0, unicode_len, clname); 126 JNU_ThrowClassNotFoundException(env, clname); 127 goto done; 128 } 129 130 if (!verifyClassname(clname, JNI_TRUE)) { /* expects slashed name */ 131 JNU_ThrowClassNotFoundException(env, clname); 132 goto done; 133 } 134 135 cls = JVM_FindClassFromCaller(env, clname, initialize, loader, caller); 136 137 done: 138 if (clname != buf) { 139 free(clname); 140 } 141 return cls; 142 } 143 144 JNIEXPORT jboolean JNICALL 145 Java_java_lang_Class_isInstance(JNIEnv *env, jobject cls, jobject obj) 146 { 147 if (obj == NULL) { 148 return JNI_FALSE; 149 } 150 return (*env)->IsInstanceOf(env, obj, (jclass)cls); 151 } 152 153 JNIEXPORT jboolean JNICALL 154 Java_java_lang_Class_isAssignableFrom(JNIEnv *env, jobject cls, jobject cls2) 155 { 156 if (cls2 == NULL) { 157 JNU_ThrowNullPointerException(env, 0); 158 return JNI_FALSE; 159 } 160 return (*env)->IsAssignableFrom(env, cls2, cls); 161 } 162 163 JNIEXPORT jclass JNICALL 164 Java_java_lang_Class_getPrimitiveClass(JNIEnv *env, 165 jclass cls, 166 jstring name) 167 { 168 const char *utfName; 169 jclass result; 170 171 if (name == NULL) { 172 JNU_ThrowNullPointerException(env, 0); 173 return NULL; 174 } 175 176 utfName = (*env)->GetStringUTFChars(env, name, 0); 177 if (utfName == 0) 178 return NULL; 179 180 result = JVM_FindPrimitiveClass(env, utfName); 181 182 (*env)->ReleaseStringUTFChars(env, name, utfName); 183 184 return result; 185 }