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 {"isIdentity", "()Z", (void *)&JVM_IsIdentityClass},
61 {"getDeclaredFields0","(Z)[" FLD, (void *)&JVM_GetClassDeclaredFields},
62 {"getDeclaredMethods0","(Z)[" MHD, (void *)&JVM_GetClassDeclaredMethods},
63 {"getDeclaredConstructors0","(Z)[" CTR, (void *)&JVM_GetClassDeclaredConstructors},
64 {"getDeclaredClasses0", "()[" CLS, (void *)&JVM_GetDeclaredClasses},
65 {"getDeclaringClass0", "()" CLS, (void *)&JVM_GetDeclaringClass},
66 {"getSimpleBinaryName0", "()" STR, (void *)&JVM_GetSimpleBinaryName},
67 {"getGenericSignature0", "()" STR, (void *)&JVM_GetClassSignature},
68 {"getRawAnnotations", "()" BA, (void *)&JVM_GetClassAnnotations},
69 {"getConstantPool", "()" CPL, (void *)&JVM_GetClassConstantPool},
70 {"desiredAssertionStatus0","("CLS")Z", (void *)&JVM_DesiredAssertionStatus},
71 {"getEnclosingMethod0", "()[" OBJ, (void *)&JVM_GetEnclosingMethodInfo},
72 {"getRawTypeAnnotations", "()" BA, (void *)&JVM_GetClassTypeAnnotations},
73 {"getNestHost0", "()" CLS, (void *)&JVM_GetNestHost},
74 {"getNestMembers0", "()[" CLS, (void *)&JVM_GetNestMembers},
75 {"getRecordComponents0", "()[" RC, (void *)&JVM_GetRecordComponents},
76 {"isRecord0", "()Z", (void *)&JVM_IsRecord},
77 {"getPermittedSubclasses0", "()[" CLS, (void *)&JVM_GetPermittedSubclasses},
78 {"getClassFileVersion0", "()I", (void *)&JVM_GetClassFileVersion},
79 {"getClassAccessFlagsRaw0", "()I", (void *)&JVM_GetClassAccessFlags},
80 };
81
82 #undef OBJ
83 #undef CLS
84 #undef STR
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, jclass caller)
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_FindClassFromCaller(env, clname, initialize, loader, caller);
139
140 done:
141 if (clname != buf) {
142 free(clname);
143 }
144 return cls;
145 }
146
147 JNIEXPORT jboolean JNICALL
148 Java_java_lang_Class_isInstance(JNIEnv *env, jobject cls, jobject obj)
149 {
150 if (obj == NULL) {
151 return JNI_FALSE;
152 }
153 return (*env)->IsInstanceOf(env, obj, (jclass)cls);
154 }
155
156 JNIEXPORT jboolean JNICALL
157 Java_java_lang_Class_isAssignableFrom(JNIEnv *env, jobject cls, jobject cls2)
158 {
159 if (cls2 == NULL) {
160 JNU_ThrowNullPointerException(env, 0);
161 return JNI_FALSE;
162 }
163 return (*env)->IsAssignableFrom(env, cls2, cls);
164 }
165
166 JNIEXPORT jclass JNICALL
167 Java_java_lang_Class_getPrimitiveClass(JNIEnv *env,
168 jclass cls,
169 jstring name)
170 {
171 const char *utfName;
172 jclass result;
173
174 if (name == NULL) {
175 JNU_ThrowNullPointerException(env, 0);
176 return NULL;
177 }
178
179 utfName = (*env)->GetStringUTFChars(env, name, 0);
180 if (utfName == 0)
181 return NULL;
182
183 result = JVM_FindPrimitiveClass(env, utfName);
184
185 (*env)->ReleaseStringUTFChars(env, name, utfName);
186
187 return result;
188 }