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) */
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 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
54 static 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 {"getComponentType", "()" CLS, (void *)&JVM_GetComponentType},
64 {"getModifiers", "()I", (void *)&JVM_GetClassModifiers},
65 {"getDeclaredFields0","(Z)[" FLD, (void *)&JVM_GetClassDeclaredFields},
66 {"getDeclaredMethods0","(Z)[" MHD, (void *)&JVM_GetClassDeclaredMethods},
67 {"getDeclaredConstructors0","(Z)[" CTR, (void *)&JVM_GetClassDeclaredConstructors},
68 {"getProtectionDomain0", "()" PD, (void *)&JVM_GetProtectionDomain},
69 {"getDeclaredClasses0", "()[" CLS, (void *)&JVM_GetDeclaredClasses},
70 {"getDeclaringClass0", "()" CLS, (void *)&JVM_GetDeclaringClass},
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
87 JNIEXPORT void JNICALL
88 Java_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
95 JNIEXPORT jclass JNICALL
96 Java_java_lang_Class_forName0(JNIEnv *env, jclass this, jstring classname,
97 jboolean initialize, jobject loader)
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_FindClassFromClassLoader(env, clname, initialize,
136 loader, JNI_FALSE);
137
138 done:
139 if (clname != buf) {
140 free(clname);
141 }
142 return cls;
143 }
144
145 JNIEXPORT jboolean JNICALL
146 Java_java_lang_Class_isInstance(JNIEnv *env, jobject cls, jobject obj)
147 {
148 if (obj == NULL) {
149 return JNI_FALSE;
150 }
151 return (*env)->IsInstanceOf(env, obj, (jclass)cls);
152 }
153
154 JNIEXPORT jboolean JNICALL
155 Java_java_lang_Class_isAssignableFrom(JNIEnv *env, jobject cls, jobject cls2)
156 {
157 if (cls2 == NULL) {
158 JNU_ThrowNullPointerException(env, 0);
159 return JNI_FALSE;
160 }
161 return (*env)->IsAssignableFrom(env, cls2, cls);
162 }
163
164 JNIEXPORT jclass JNICALL
165 Java_java_lang_Class_getPrimitiveClass(JNIEnv *env,
166 jclass cls,
167 jstring name)
168 {
169 const char *utfName;
170 jclass result;
171
172 if (name == NULL) {
173 JNU_ThrowNullPointerException(env, 0);
174 return NULL;
175 }
176
177 utfName = (*env)->GetStringUTFChars(env, name, 0);
178 if (utfName == 0)
179 return NULL;
180
181 result = JVM_FindPrimitiveClass(env, utfName);
182
183 (*env)->ReleaseStringUTFChars(env, name, utfName);
184
185 return result;
186 }