1 /*
2 * Copyright (c) 1994, 2010, 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) */
41 extern jboolean VerifyClassname(char *utf_name, jboolean arrayAllowed);
42 extern 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 JCL "Ljava/lang/ClassLoader;"
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
55 static JNINativeMethod methods[] = {
56 {"getName0", "()" STR, (void *)&JVM_GetClassName},
57 {"getSuperclass", "()" CLS, NULL},
58 {"getInterfaces", "()[" CLS, (void *)&JVM_GetClassInterfaces},
59 {"getClassLoader0", "()" JCL, (void *)&JVM_GetClassLoader},
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 {"isPrimitive", "()Z", (void *)&JVM_IsPrimitiveClass},
65 {"getComponentType", "()" CLS, (void *)&JVM_GetComponentType},
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 {"setProtectionDomain0", "(" PD ")V", (void *)&JVM_SetProtectionDomain},
72 {"getDeclaredClasses0", "()[" CLS, (void *)&JVM_GetDeclaredClasses},
73 {"getDeclaringClass", "()" CLS, (void *)&JVM_GetDeclaringClass},
74 {"getGenericSignature", "()" 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 };
80
81 #undef OBJ
82 #undef CLS
83 #undef STR
84 #undef JCL
85 #undef FLD
86 #undef MHD
87 #undef CTR
88 #undef PD
89
90 JNIEXPORT void JNICALL
91 Java_java_lang_Class_registerNatives(JNIEnv *env, jclass cls)
92 {
93 methods[1].fnPtr = (void *)(*env)->GetSuperclass;
94 (*env)->RegisterNatives(env, cls, methods,
95 sizeof(methods)/sizeof(JNINativeMethod));
96 }
97
98 JNIEXPORT jclass JNICALL
99 Java_java_lang_Class_forName0(JNIEnv *env, jclass this, jstring classname,
100 jboolean initialize, jobject loader)
101 {
102 char *clname;
103 jclass cls = 0;
104 char buf[128];
105 jsize len;
106 jsize unicode_len;
107
108 if (classname == NULL) {
109 JNU_ThrowNullPointerException(env, 0);
110 return 0;
111 }
112
113 len = (*env)->GetStringUTFLength(env, classname);
114 unicode_len = (*env)->GetStringLength(env, classname);
115 if (len >= (jsize)sizeof(buf)) {
116 clname = malloc(len + 1);
117 if (clname == NULL) {
118 JNU_ThrowOutOfMemoryError(env, NULL);
119 return NULL;
120 }
121 } else {
122 clname = buf;
123 }
124 (*env)->GetStringUTFRegion(env, classname, 0, unicode_len, clname);
125
126 if (VerifyFixClassname(clname) == JNI_TRUE) {
127 /* slashes present in clname, use name b4 translation for exception */
128 (*env)->GetStringUTFRegion(env, classname, 0, unicode_len, clname);
129 JNU_ThrowClassNotFoundException(env, clname);
130 goto done;
131 }
132
133 if (!VerifyClassname(clname, JNI_TRUE)) { /* expects slashed name */
134 JNU_ThrowClassNotFoundException(env, clname);
135 goto done;
136 }
137
138 cls = JVM_FindClassFromClassLoader(env, clname, initialize,
139 loader, JNI_FALSE);
140
141 done:
142 if (clname != buf) {
143 free(clname);
144 }
145 return cls;
146 }
147
148 JNIEXPORT jboolean JNICALL
149 Java_java_lang_Class_isInstance(JNIEnv *env, jobject cls, jobject obj)
150 {
151 if (obj == NULL) {
152 return JNI_FALSE;
153 }
154 return (*env)->IsInstanceOf(env, obj, (jclass)cls);
155 }
156
157 JNIEXPORT jboolean JNICALL
158 Java_java_lang_Class_isAssignableFrom(JNIEnv *env, jobject cls, jobject cls2)
159 {
160 if (cls2 == NULL) {
161 JNU_ThrowNullPointerException(env, 0);
162 return JNI_FALSE;
163 }
164 return (*env)->IsAssignableFrom(env, cls2, cls);
165 }
166
167 JNIEXPORT jclass JNICALL
168 Java_java_lang_Class_getPrimitiveClass(JNIEnv *env,
169 jclass cls,
170 jstring name)
171 {
172 const char *utfName;
173 jclass result;
174
175 if (name == NULL) {
176 JNU_ThrowNullPointerException(env, 0);
177 return NULL;
178 }
179
180 utfName = (*env)->GetStringUTFChars(env, name, 0);
181 if (utfName == 0)
182 return NULL;
183
184 result = JVM_FindPrimitiveClass(env, utfName);
185
186 (*env)->ReleaseStringUTFChars(env, name, utfName);
187
188 return result;
189 }