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 /* defined in libverify.so/verify.dll (src file common/check_format.c) */ 42 extern jboolean VerifyClassname(char *utf_name, jboolean arrayAllowed); 43 extern jboolean VerifyFixClassname(char *utf_name); 44 45 #define OBJ "Ljava/lang/Object;" 46 #define CLS "Ljava/lang/Class;" 47 #define CPL "Ljdk/internal/reflect/ConstantPool;" 48 #define STR "Ljava/lang/String;" 49 #define FLD "Ljava/lang/reflect/Field;" 50 #define MHD "Ljava/lang/reflect/Method;" 51 #define CTR "Ljava/lang/reflect/Constructor;" 52 #define PD "Ljava/security/ProtectionDomain;" 53 #define BA "[B" 54 #define RC "Ljava/lang/reflect/RecordComponent;" 55 56 static JNINativeMethod methods[] = { 57 {"initClassName", "()" STR, (void *)&JVM_InitClassName}, 58 {"getSuperclass", "()" CLS, NULL}, 59 {"getInterfaces0", "()[" CLS, (void *)&JVM_GetClassInterfaces}, 60 {"isInterface", "()Z", (void *)&JVM_IsInterface}, 61 {"getSigners", "()[" OBJ, (void *)&JVM_GetClassSigners}, 62 {"setSigners", "([" OBJ ")V", (void *)&JVM_SetClassSigners}, 63 {"isArray", "()Z", (void *)&JVM_IsArrayClass}, 64 {"isHidden", "()Z", (void *)&JVM_IsHiddenClass}, 65 {"isPrimitive", "()Z", (void *)&JVM_IsPrimitiveClass}, 66 {"getModifiers", "()I", (void *)&JVM_GetClassModifiers}, 67 {"getDeclaredFields0","(Z)[" FLD, (void *)&JVM_GetClassDeclaredFields}, 68 {"getDeclaredMethods0","(Z)[" MHD, (void *)&JVM_GetClassDeclaredMethods}, 69 {"getDeclaredConstructors0","(Z)[" CTR, (void *)&JVM_GetClassDeclaredConstructors}, 70 {"getProtectionDomain0", "()" PD, (void *)&JVM_GetProtectionDomain}, 71 {"getDeclaredClasses0", "()[" CLS, (void *)&JVM_GetDeclaredClasses}, 72 {"getDeclaringClass0", "()" CLS, (void *)&JVM_GetDeclaringClass}, 73 {"getSimpleBinaryName0", "()" STR, (void *)&JVM_GetSimpleBinaryName}, 74 {"getGenericSignature0", "()" STR, (void *)&JVM_GetClassSignature}, 75 {"getRawAnnotations", "()" BA, (void *)&JVM_GetClassAnnotations}, 76 {"getConstantPool", "()" CPL, (void *)&JVM_GetClassConstantPool}, 77 {"desiredAssertionStatus0","("CLS")Z", (void *)&JVM_DesiredAssertionStatus}, 78 {"getEnclosingMethod0", "()[" OBJ, (void *)&JVM_GetEnclosingMethodInfo}, 79 {"getRawTypeAnnotations", "()" BA, (void *)&JVM_GetClassTypeAnnotations}, 80 {"getNestHost0", "()" CLS, (void *)&JVM_GetNestHost}, 81 {"getNestMembers0", "()[" CLS, (void *)&JVM_GetNestMembers}, 82 {"getRecordComponents0", "()[" RC, (void *)&JVM_GetRecordComponents}, 83 {"isRecord0", "()Z", (void *)&JVM_IsRecord}, 84 }; 85 86 #undef OBJ 87 #undef CLS 88 #undef STR 89 #undef FLD 90 #undef MHD 91 #undef CTR 92 #undef PD 93 94 JNIEXPORT void JNICALL 95 Java_java_lang_Class_registerNatives(JNIEnv *env, jclass cls) 96 { 97 methods[1].fnPtr = (void *)(*env)->GetSuperclass; 98 (*env)->RegisterNatives(env, cls, methods, 99 sizeof(methods)/sizeof(JNINativeMethod)); 100 } 101 102 JNIEXPORT jclass JNICALL 103 Java_java_lang_Class_forName0(JNIEnv *env, jclass this, jstring classname, 104 jboolean initialize, jobject loader, jclass caller) 105 { 106 char *clname; 107 jclass cls = 0; 108 char buf[128]; 109 jsize len; 110 jsize unicode_len; 111 112 if (classname == NULL) { 113 JNU_ThrowNullPointerException(env, 0); 114 return 0; 115 } 116 117 len = (*env)->GetStringUTFLength(env, classname); 118 unicode_len = (*env)->GetStringLength(env, classname); 119 if (len >= (jsize)sizeof(buf)) { 120 clname = malloc(len + 1); 121 if (clname == NULL) { 122 JNU_ThrowOutOfMemoryError(env, NULL); 123 return NULL; 124 } 125 } else { 126 clname = buf; 127 } 128 (*env)->GetStringUTFRegion(env, classname, 0, unicode_len, clname); 129 130 if (verifyFixClassname(clname) == JNI_TRUE) { 131 /* slashes present in clname, use name b4 translation for exception */ 132 (*env)->GetStringUTFRegion(env, classname, 0, unicode_len, clname); 133 JNU_ThrowClassNotFoundException(env, clname); 134 goto done; 135 } 136 137 if (!verifyClassname(clname, JNI_TRUE)) { /* expects slashed name */ 138 JNU_ThrowClassNotFoundException(env, clname); 139 goto done; 140 } 141 142 cls = JVM_FindClassFromCaller(env, clname, initialize, loader, caller); 143 144 done: 145 if (clname != buf) { 146 free(clname); 147 } 148 return cls; 149 } 150 151 JNIEXPORT jboolean JNICALL 152 Java_java_lang_Class_isInstance(JNIEnv *env, jobject cls, jobject obj) 153 { 154 if (obj == NULL) { 155 return JNI_FALSE; 156 } 157 return (*env)->IsInstanceOf(env, obj, (jclass)cls); 158 } 159 160 JNIEXPORT jboolean JNICALL 161 Java_java_lang_Class_isAssignableFrom(JNIEnv *env, jobject cls, jobject cls2) 162 { 163 if (cls2 == NULL) { 164 JNU_ThrowNullPointerException(env, 0); 165 return JNI_FALSE; 166 } 167 return (*env)->IsAssignableFrom(env, cls2, cls); 168 } 169 170 JNIEXPORT jclass JNICALL 171 Java_java_lang_Class_getPrimitiveClass(JNIEnv *env, 172 jclass cls, 173 jstring name) 174 { 175 const char *utfName; 176 jclass result; 177 178 if (name == NULL) { 179 JNU_ThrowNullPointerException(env, 0); 180 return NULL; 181 } 182 183 utfName = (*env)->GetStringUTFChars(env, name, 0); 184 if (utfName == 0) 185 return NULL; 186 187 result = JVM_FindPrimitiveClass(env, utfName); 188 189 (*env)->ReleaseStringUTFChars(env, name, utfName); 190 191 return result; 192 }