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     {"isPrimitive",      "()Z",             (void *)&JVM_IsPrimitiveClass},
  60     {"getModifiers",     "()I",             (void *)&JVM_GetClassModifiers},
  61     {"getDeclaredFields0","(Z)[" FLD,       (void *)&JVM_GetClassDeclaredFields},
  62     {"getDeclaredMethods0","(Z)[" MHD,      (void *)&JVM_GetClassDeclaredMethods},
  63     {"getDeclaredConstructors0","(Z)[" CTR, (void *)&JVM_GetClassDeclaredConstructors},
  64     {"getProtectionDomain0", "()" PD,       (void *)&JVM_GetProtectionDomain},
  65     {"getDeclaredClasses0",  "()[" CLS,     (void *)&JVM_GetDeclaredClasses},
  66     {"getDeclaringClass0",   "()" CLS,      (void *)&JVM_GetDeclaringClass},
  67     {"getSimpleBinaryName0", "()" STR,      (void *)&JVM_GetSimpleBinaryName},
  68     {"getGenericSignature0", "()" STR,      (void *)&JVM_GetClassSignature},
  69     {"getRawAnnotations",      "()" BA,     (void *)&JVM_GetClassAnnotations},
  70     {"getConstantPool",     "()" CPL,       (void *)&JVM_GetClassConstantPool},
  71     {"desiredAssertionStatus0","("CLS")Z",  (void *)&JVM_DesiredAssertionStatus},
  72     {"getEnclosingMethod0", "()[" OBJ,      (void *)&JVM_GetEnclosingMethodInfo},
  73     {"getRawTypeAnnotations", "()" BA,      (void *)&JVM_GetClassTypeAnnotations},
  74     {"getNestHost0",         "()" CLS,      (void *)&JVM_GetNestHost},
  75     {"getNestMembers0",      "()[" CLS,     (void *)&JVM_GetNestMembers},
  76 };
  77 
  78 #undef OBJ
  79 #undef CLS
  80 #undef STR
  81 #undef FLD
  82 #undef MHD
  83 #undef CTR
  84 #undef PD
  85 
  86 JNIEXPORT void JNICALL
  87 Java_java_lang_Class_registerNatives(JNIEnv *env, jclass cls)
  88 {
  89     methods[1].fnPtr = (void *)(*env)->GetSuperclass;
  90     (*env)->RegisterNatives(env, cls, methods,
  91                             sizeof(methods)/sizeof(JNINativeMethod));
  92 }
  93 
  94 JNIEXPORT jclass JNICALL
  95 Java_java_lang_Class_forName0(JNIEnv *env, jclass this, jstring classname,
  96                               jboolean initialize, jobject loader, jclass caller)
  97 {
  98     char *clname;
  99     jclass cls = 0;
 100     char buf[128];
 101     jsize len;
 102     jsize unicode_len;
 103 
 104     if (classname == NULL) {
 105         JNU_ThrowNullPointerException(env, 0);
 106         return 0;
 107     }
 108 
 109     len = (*env)->GetStringUTFLength(env, classname);
 110     unicode_len = (*env)->GetStringLength(env, classname);
 111     if (len >= (jsize)sizeof(buf)) {
 112         clname = malloc(len + 1);
 113         if (clname == NULL) {
 114             JNU_ThrowOutOfMemoryError(env, NULL);
 115             return NULL;
 116         }
 117     } else {
 118         clname = buf;
 119     }
 120     (*env)->GetStringUTFRegion(env, classname, 0, unicode_len, clname);
 121 
 122     if (verifyFixClassname(clname) == JNI_TRUE) {
 123         /* slashes present in clname, use name b4 translation for exception */
 124         (*env)->GetStringUTFRegion(env, classname, 0, unicode_len, clname);
 125         JNU_ThrowClassNotFoundException(env, clname);
 126         goto done;
 127     }
 128 
 129     if (!verifyClassname(clname, JNI_TRUE)) {  /* expects slashed name */
 130         JNU_ThrowClassNotFoundException(env, clname);
 131         goto done;
 132     }
 133 
 134     cls = JVM_FindClassFromCaller(env, clname, initialize, loader, caller);
 135 
 136  done:
 137     if (clname != buf) {
 138         free(clname);
 139     }
 140     return cls;
 141 }
 142 
 143 JNIEXPORT jboolean JNICALL
 144 Java_java_lang_Class_isInstance(JNIEnv *env, jobject cls, jobject obj)
 145 {
 146     if (obj == NULL) {
 147         return JNI_FALSE;
 148     }
 149     return (*env)->IsInstanceOf(env, obj, (jclass)cls);
 150 }
 151 
 152 JNIEXPORT jboolean JNICALL
 153 Java_java_lang_Class_isAssignableFrom(JNIEnv *env, jobject cls, jobject cls2)
 154 {
 155     if (cls2 == NULL) {
 156         JNU_ThrowNullPointerException(env, 0);
 157         return JNI_FALSE;
 158     }
 159     return (*env)->IsAssignableFrom(env, cls2, cls);
 160 }
 161 
 162 JNIEXPORT jclass JNICALL
 163 Java_java_lang_Class_getPrimitiveClass(JNIEnv *env,
 164                                        jclass cls,
 165                                        jstring name)
 166 {
 167     const char *utfName;
 168     jclass result;
 169 
 170     if (name == NULL) {
 171         JNU_ThrowNullPointerException(env, 0);
 172         return NULL;
 173     }
 174 
 175     utfName = (*env)->GetStringUTFChars(env, name, 0);
 176     if (utfName == 0)
 177         return NULL;
 178 
 179     result = JVM_FindPrimitiveClass(env, utfName);
 180 
 181     (*env)->ReleaseStringUTFChars(env, name, utfName);
 182 
 183     return result;
 184 }