1 /*
2 * Copyright (c) 1994, 2025, 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 BA "[B"
53 #define RC "Ljava/lang/reflect/RecordComponent;"
54
55 static JNINativeMethod methods[] = {
56 {"initClassName", "()" STR, (void *)&JVM_InitClassName},
57 {"getSuperclass", "()" CLS, NULL},
58 {"getInterfaces0", "()[" CLS, (void *)&JVM_GetClassInterfaces},
59 {"isHidden", "()Z", (void *)&JVM_IsHiddenClass},
60 {"getDeclaredFields0","(Z)[" FLD, (void *)&JVM_GetClassDeclaredFields},
61 {"getDeclaredMethods0","(Z)[" MHD, (void *)&JVM_GetClassDeclaredMethods},
62 {"getDeclaredConstructors0","(Z)[" CTR, (void *)&JVM_GetClassDeclaredConstructors},
63 {"getDeclaredClasses0", "()[" CLS, (void *)&JVM_GetDeclaredClasses},
64 {"getDeclaringClass0", "()" CLS, (void *)&JVM_GetDeclaringClass},
65 {"getSimpleBinaryName0", "()" STR, (void *)&JVM_GetSimpleBinaryName},
66 {"getGenericSignature0", "()" STR, (void *)&JVM_GetClassSignature},
67 {"getRawAnnotations", "()" BA, (void *)&JVM_GetClassAnnotations},
68 {"getConstantPool", "()" CPL, (void *)&JVM_GetClassConstantPool},
69 {"desiredAssertionStatus0","("CLS")Z", (void *)&JVM_DesiredAssertionStatus},
70 {"getEnclosingMethod0", "()[" OBJ, (void *)&JVM_GetEnclosingMethodInfo},
71 {"getRawTypeAnnotations", "()" BA, (void *)&JVM_GetClassTypeAnnotations},
72 {"getNestHost0", "()" CLS, (void *)&JVM_GetNestHost},
73 {"getNestMembers0", "()[" CLS, (void *)&JVM_GetNestMembers},
74 {"getRecordComponents0", "()[" RC, (void *)&JVM_GetRecordComponents},
75 {"isRecord0", "()Z", (void *)&JVM_IsRecord},
76 {"getPermittedSubclasses0", "()[" CLS, (void *)&JVM_GetPermittedSubclasses},
77 {"getClassFileVersion0", "()I", (void *)&JVM_GetClassFileVersion},
78 {"getClassAccessFlagsRaw0", "()I", (void *)&JVM_GetClassAccessFlags},
79 };
80
81 #undef OBJ
82 #undef CLS
83 #undef STR
84 #undef FLD
85 #undef MHD
86 #undef CTR
87 #undef PD
88
89 JNIEXPORT void JNICALL
90 Java_java_lang_Class_registerNatives(JNIEnv *env, jclass cls)
91 {
92 methods[1].fnPtr = (void *)(*env)->GetSuperclass;
93 (*env)->RegisterNatives(env, cls, methods,
94 sizeof(methods)/sizeof(JNINativeMethod));
95 }
96
97 JNIEXPORT jclass JNICALL
98 Java_java_lang_Class_forName0(JNIEnv *env, jclass this, jstring classname,
99 jboolean initialize, jobject loader, jclass caller)
100 {
101 char *clname;
102 jclass cls = 0;
103 char buf[128];
104 jsize len;
105 jsize unicode_len;
106
107 if (classname == NULL) {
108 JNU_ThrowNullPointerException(env, 0);
109 return 0;
110 }
111
112 len = (*env)->GetStringUTFLength(env, classname);
113 unicode_len = (*env)->GetStringLength(env, classname);
114 if (len >= (jsize)sizeof(buf)) {
115 clname = malloc(len + 1);
116 if (clname == NULL) {
117 JNU_ThrowOutOfMemoryError(env, NULL);
118 return NULL;
119 }
120 } else {
121 clname = buf;
122 }
123 (*env)->GetStringUTFRegion(env, classname, 0, unicode_len, clname);
124
125 if (verifyFixClassname(clname) == JNI_TRUE) {
126 /* slashes present in clname, use name b4 translation for exception */
127 (*env)->GetStringUTFRegion(env, classname, 0, unicode_len, clname);
128 JNU_ThrowClassNotFoundException(env, clname);
129 goto done;
130 }
131
132 if (!verifyClassname(clname, JNI_TRUE)) { /* expects slashed name */
133 JNU_ThrowClassNotFoundException(env, clname);
134 goto done;
135 }
136
137 cls = JVM_FindClassFromCaller(env, clname, initialize, loader, caller);
138
139 done:
140 if (clname != buf) {
141 free(clname);
142 }
143 return cls;
144 }
145
146 JNIEXPORT jboolean JNICALL
147 Java_java_lang_Class_isInstance(JNIEnv *env, jobject cls, jobject obj)
148 {
149 if (obj == NULL) {
150 return JNI_FALSE;
151 }
152 return (*env)->IsInstanceOf(env, obj, (jclass)cls);
153 }
154
155 JNIEXPORT jboolean JNICALL
156 Java_java_lang_Class_isAssignableFrom(JNIEnv *env, jobject cls, jobject cls2)
157 {
158 if (cls2 == NULL) {
159 JNU_ThrowNullPointerException(env, 0);
160 return JNI_FALSE;
161 }
162 return (*env)->IsAssignableFrom(env, cls2, cls);
163 }
164
165 JNIEXPORT jclass JNICALL
166 Java_java_lang_Class_getPrimitiveClass(JNIEnv *env,
167 jclass cls,
168 jstring name)
169 {
170 const char *utfName;
171 jclass result;
172
173 if (name == NULL) {
174 JNU_ThrowNullPointerException(env, 0);
175 return NULL;
176 }
177
178 utfName = (*env)->GetStringUTFChars(env, name, 0);
179 if (utfName == 0)
180 return NULL;
181
182 result = JVM_FindPrimitiveClass(env, utfName);
183
184 (*env)->ReleaseStringUTFChars(env, name, utfName);
185
186 return result;
187 }