1/*
2 * Copyright (c) 1994, 2014, 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 "java_lang_Class.h"
39
40/* defined in libverify.so/verify.dll (src file common/check_format.c) */
41extern jboolean VerifyClassname(char *utf_name, jboolean arrayAllowed);
42extern jboolean VerifyFixClassname(char *utf_name);
43
44#define OBJ "Ljava/lang/Object;"
45#define CLS "Ljava/lang/Class;"
46#define CPL "Ljdk/internal/reflect/ConstantPool;"
47#define STR "Ljava/lang/String;"
48#define FLD "Ljava/lang/reflect/Field;"
49#define MHD "Ljava/lang/reflect/Method;"
50#define CTR "Ljava/lang/reflect/Constructor;"
51#define PD  "Ljava/security/ProtectionDomain;"
52#define BA  "[B"
53
54static JNINativeMethod methods[] = {
55    {"getName0",         "()" STR,          (void *)&JVM_GetClassName},
56    {"getSuperclass",    "()" CLS,          NULL},
57    {"getInterfaces0",   "()[" CLS,         (void *)&JVM_GetClassInterfaces},
58    {"isInterface",      "()Z",             (void *)&JVM_IsInterface},
59    {"getSigners",       "()[" OBJ,         (void *)&JVM_GetClassSigners},
60    {"setSigners",       "([" OBJ ")V",     (void *)&JVM_SetClassSigners},
61    {"isArray",          "()Z",             (void *)&JVM_IsArrayClass},
62    {"isPrimitive",      "()Z",             (void *)&JVM_IsPrimitiveClass},
63    {"getModifiers",     "()I",             (void *)&JVM_GetClassModifiers},
64    {"getDeclaredFields0","(Z)[" FLD,       (void *)&JVM_GetClassDeclaredFields},
65    {"getDeclaredMethods0","(Z)[" MHD,      (void *)&JVM_GetClassDeclaredMethods},
66    {"getDeclaredConstructors0","(Z)[" CTR, (void *)&JVM_GetClassDeclaredConstructors},
67    {"getProtectionDomain0", "()" PD,       (void *)&JVM_GetProtectionDomain},
68    {"getDeclaredClasses0",  "()[" CLS,      (void *)&JVM_GetDeclaredClasses},
69    {"getDeclaringClass0",   "()" CLS,      (void *)&JVM_GetDeclaringClass},
70    {"getSimpleBinaryName0", "()" STR,      (void *)&JVM_GetSimpleBinaryName},
71    {"getGenericSignature0", "()" STR,      (void *)&JVM_GetClassSignature},
72    {"getRawAnnotations",      "()" BA,        (void *)&JVM_GetClassAnnotations},
73    {"getConstantPool",     "()" CPL,       (void *)&JVM_GetClassConstantPool},
74    {"desiredAssertionStatus0","("CLS")Z",(void *)&JVM_DesiredAssertionStatus},
75    {"getEnclosingMethod0", "()[" OBJ,      (void *)&JVM_GetEnclosingMethodInfo},
76    {"getRawTypeAnnotations", "()" BA,      (void *)&JVM_GetClassTypeAnnotations},
77};
78
79#undef OBJ
80#undef CLS
81#undef STR
82#undef FLD
83#undef MHD
84#undef CTR
85#undef PD
86
87JNIEXPORT void JNICALL
88Java_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
95JNIEXPORT jclass JNICALL
96Java_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
144JNIEXPORT jboolean JNICALL
145Java_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
153JNIEXPORT jboolean JNICALL
154Java_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
163JNIEXPORT jclass JNICALL
164Java_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}
186