Class.c revision 10826:0f023dd9a5a6 
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 "Lsun/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    {"getGenericSignature0", "()" STR,      (void *)&JVM_GetClassSignature},
71    {"getRawAnnotations",      "()" BA,        (void *)&JVM_GetClassAnnotations},
72    {"getConstantPool",     "()" CPL,       (void *)&JVM_GetClassConstantPool},
73    {"desiredAssertionStatus0","("CLS")Z",(void *)&JVM_DesiredAssertionStatus},
74    {"getEnclosingMethod0", "()[" OBJ,      (void *)&JVM_GetEnclosingMethodInfo},
75    {"getRawTypeAnnotations", "()" BA,      (void *)&JVM_GetClassTypeAnnotations},
76};
77
78#undef OBJ
79#undef CLS
80#undef STR
81#undef FLD
82#undef MHD
83#undef CTR
84#undef PD
85
86JNIEXPORT void JNICALL
87Java_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
94JNIEXPORT jclass JNICALL
95Java_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
143JNIEXPORT jboolean JNICALL
144Java_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
152JNIEXPORT jboolean JNICALL
153Java_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
162JNIEXPORT jclass JNICALL
163Java_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}
185