1 /*
2 * Copyright (c) 1994, 2022, 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 /* defined in libverify.so/verify.dll (src file common/check_format.c) */
42 extern jboolean VerifyClassname(char *utf_name, jboolean arrayAllowed);
43 extern jboolean VerifyFixClassname(char *utf_name);
44
45 #define OBJ "Ljava/lang/Object;"
46 #define CLS "Ljava/lang/Class;"
47 #define CPL "Ljdk/internal/reflect/ConstantPool;"
48 #define STR "Ljava/lang/String;"
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 #define RC "Ljava/lang/reflect/RecordComponent;"
55
56 static JNINativeMethod methods[] = {
57 {"initClassName", "()" STR, (void *)&JVM_InitClassName},
58 {"getSuperclass", "()" CLS, NULL},
59 {"getInterfaces0", "()[" CLS, (void *)&JVM_GetClassInterfaces},
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 {"isHidden", "()Z", (void *)&JVM_IsHiddenClass},
65 {"isPrimitive", "()Z", (void *)&JVM_IsPrimitiveClass},
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 {"getDeclaredClasses0", "()[" CLS, (void *)&JVM_GetDeclaredClasses},
72 {"getDeclaringClass0", "()" CLS, (void *)&JVM_GetDeclaringClass},
73 {"getSimpleBinaryName0", "()" STR, (void *)&JVM_GetSimpleBinaryName},
74 {"getGenericSignature0", "()" 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 {"getRawTypeAnnotations", "()" BA, (void *)&JVM_GetClassTypeAnnotations},
80 {"getNestHost0", "()" CLS, (void *)&JVM_GetNestHost},
81 {"getNestMembers0", "()[" CLS, (void *)&JVM_GetNestMembers},
82 {"getRecordComponents0", "()[" RC, (void *)&JVM_GetRecordComponents},
83 {"isRecord0", "()Z", (void *)&JVM_IsRecord},
84 {"getPermittedSubclasses0", "()[" CLS, (void *)&JVM_GetPermittedSubclasses},
85 {"getClassFileVersion0", "()I", (void *)&JVM_GetClassFileVersion},
86 {"getClassAccessFlagsRaw0", "()I", (void *)&JVM_GetClassAccessFlags},
87 };
88
89 #undef OBJ
90 #undef CLS
91 #undef STR
92 #undef FLD
93 #undef MHD
94 #undef CTR
95 #undef PD
96
97 JNIEXPORT void JNICALL
98 Java_java_lang_Class_registerNatives(JNIEnv *env, jclass cls)
99 {
100 methods[1].fnPtr = (void *)(*env)->GetSuperclass;
101 (*env)->RegisterNatives(env, cls, methods,
102 sizeof(methods)/sizeof(JNINativeMethod));
103 }
104
105 JNIEXPORT jclass JNICALL
106 Java_java_lang_Class_forName0(JNIEnv *env, jclass this, jstring classname,
107 jboolean initialize, jobject loader, jclass caller)
108 {
109 char *clname;
110 jclass cls = 0;
111 char buf[128];
112 jsize len;
113 jsize unicode_len;
114
115 if (classname == NULL) {
116 JNU_ThrowNullPointerException(env, 0);
117 return 0;
118 }
119
120 len = (*env)->GetStringUTFLength(env, classname);
121 unicode_len = (*env)->GetStringLength(env, classname);
122 if (len >= (jsize)sizeof(buf)) {
123 clname = malloc(len + 1);
124 if (clname == NULL) {
125 JNU_ThrowOutOfMemoryError(env, NULL);
126 return NULL;
127 }
128 } else {
129 clname = buf;
130 }
131 (*env)->GetStringUTFRegion(env, classname, 0, unicode_len, clname);
132
133 if (verifyFixClassname(clname) == JNI_TRUE) {
134 /* slashes present in clname, use name b4 translation for exception */
135 (*env)->GetStringUTFRegion(env, classname, 0, unicode_len, clname);
136 JNU_ThrowClassNotFoundException(env, clname);
137 goto done;
138 }
139
140 if (!verifyClassname(clname, JNI_TRUE)) { /* expects slashed name */
141 JNU_ThrowClassNotFoundException(env, clname);
142 goto done;
143 }
144
145 cls = JVM_FindClassFromCaller(env, clname, initialize, loader, caller);
146
147 done:
148 if (clname != buf) {
149 free(clname);
150 }
151 return cls;
152 }
153
154 JNIEXPORT jboolean JNICALL
155 Java_java_lang_Class_isInstance(JNIEnv *env, jobject cls, jobject obj)
156 {
157 if (obj == NULL) {
158 return JNI_FALSE;
159 }
160 return (*env)->IsInstanceOf(env, obj, (jclass)cls);
161 }
162
163 JNIEXPORT jboolean JNICALL
164 Java_java_lang_Class_isAssignableFrom(JNIEnv *env, jobject cls, jobject cls2)
165 {
166 if (cls2 == NULL) {
167 JNU_ThrowNullPointerException(env, 0);
168 return JNI_FALSE;
169 }
170 return (*env)->IsAssignableFrom(env, cls2, cls);
171 }
172
173 JNIEXPORT jclass JNICALL
174 Java_java_lang_Class_getPrimitiveClass(JNIEnv *env,
175 jclass cls,
176 jstring name)
177 {
178 const char *utfName;
179 jclass result;
180
181 if (name == NULL) {
182 JNU_ThrowNullPointerException(env, 0);
183 return NULL;
184 }
185
186 utfName = (*env)->GetStringUTFChars(env, name, 0);
187 if (utfName == 0)
188 return NULL;
189
190 result = JVM_FindPrimitiveClass(env, utfName);
191
192 (*env)->ReleaseStringUTFChars(env, name, utfName);
193
194 return result;
195 }