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 {"isArray", "()Z", (void *)&JVM_IsArrayClass},
62 {"isHidden", "()Z", (void *)&JVM_IsHiddenClass},
63 {"isIdentity", "()Z", (void *)&JVM_IsIdentityClass},
64 {"isPrimitive", "()Z", (void *)&JVM_IsPrimitiveClass},
65 {"getModifiers", "()I", (void *)&JVM_GetClassModifiers},
66 {"getDeclaredFields0","(Z)[" FLD, (void *)&JVM_GetClassDeclaredFields},
67 {"getDeclaredMethods0","(Z)[" MHD, (void *)&JVM_GetClassDeclaredMethods},
68 {"getDeclaredConstructors0","(Z)[" CTR, (void *)&JVM_GetClassDeclaredConstructors},
69 {"getProtectionDomain0", "()" PD, (void *)&JVM_GetProtectionDomain},
70 {"getDeclaredClasses0", "()[" CLS, (void *)&JVM_GetDeclaredClasses},
71 {"getDeclaringClass0", "()" CLS, (void *)&JVM_GetDeclaringClass},
72 {"getSimpleBinaryName0", "()" STR, (void *)&JVM_GetSimpleBinaryName},
73 {"getGenericSignature0", "()" STR, (void *)&JVM_GetClassSignature},
74 {"getRawAnnotations", "()" BA, (void *)&JVM_GetClassAnnotations},
75 {"getConstantPool", "()" CPL, (void *)&JVM_GetClassConstantPool},
76 {"desiredAssertionStatus0","("CLS")Z", (void *)&JVM_DesiredAssertionStatus},
77 {"getEnclosingMethod0", "()[" OBJ, (void *)&JVM_GetEnclosingMethodInfo},
78 {"getRawTypeAnnotations", "()" BA, (void *)&JVM_GetClassTypeAnnotations},
79 {"getNestHost0", "()" CLS, (void *)&JVM_GetNestHost},
80 {"getNestMembers0", "()[" CLS, (void *)&JVM_GetNestMembers},
81 {"getRecordComponents0", "()[" RC, (void *)&JVM_GetRecordComponents},
82 {"isRecord0", "()Z", (void *)&JVM_IsRecord},
83 {"getPermittedSubclasses0", "()[" CLS, (void *)&JVM_GetPermittedSubclasses},
84 {"getClassFileVersion0", "()I", (void *)&JVM_GetClassFileVersion},
85 {"getClassAccessFlagsRaw0", "()I", (void *)&JVM_GetClassAccessFlags},
86 };
87
88 #undef OBJ
89 #undef CLS
90 #undef STR
91 #undef FLD
92 #undef MHD
93 #undef CTR
94 #undef PD
95
96 JNIEXPORT void JNICALL
97 Java_java_lang_Class_registerNatives(JNIEnv *env, jclass cls)
98 {
99 methods[1].fnPtr = (void *)(*env)->GetSuperclass;
100 (*env)->RegisterNatives(env, cls, methods,
101 sizeof(methods)/sizeof(JNINativeMethod));
102 }
103
104 JNIEXPORT jclass JNICALL
105 Java_java_lang_Class_forName0(JNIEnv *env, jclass this, jstring classname,
106 jboolean initialize, jobject loader, jclass caller)
107 {
108 char *clname;
109 jclass cls = 0;
110 char buf[128];
111 jsize len;
112 jsize unicode_len;
113
114 if (classname == NULL) {
115 JNU_ThrowNullPointerException(env, 0);
116 return 0;
117 }
118
119 len = (*env)->GetStringUTFLength(env, classname);
120 unicode_len = (*env)->GetStringLength(env, classname);
121 if (len >= (jsize)sizeof(buf)) {
122 clname = malloc(len + 1);
123 if (clname == NULL) {
124 JNU_ThrowOutOfMemoryError(env, NULL);
125 return NULL;
126 }
127 } else {
128 clname = buf;
129 }
130 (*env)->GetStringUTFRegion(env, classname, 0, unicode_len, clname);
131
132 if (verifyFixClassname(clname) == JNI_TRUE) {
133 /* slashes present in clname, use name b4 translation for exception */
134 (*env)->GetStringUTFRegion(env, classname, 0, unicode_len, clname);
135 JNU_ThrowClassNotFoundException(env, clname);
136 goto done;
137 }
138
139 if (!verifyClassname(clname, JNI_TRUE)) { /* expects slashed name */
140 JNU_ThrowClassNotFoundException(env, clname);
141 goto done;
142 }
143
144 cls = JVM_FindClassFromCaller(env, clname, initialize, loader, caller);
145
146 done:
147 if (clname != buf) {
148 free(clname);
149 }
150 return cls;
151 }
152
153 JNIEXPORT jboolean JNICALL
154 Java_java_lang_Class_isInstance(JNIEnv *env, jobject cls, jobject obj)
155 {
156 if (obj == NULL) {
157 return JNI_FALSE;
158 }
159 return (*env)->IsInstanceOf(env, obj, (jclass)cls);
160 }
161
162 JNIEXPORT jboolean JNICALL
163 Java_java_lang_Class_isAssignableFrom(JNIEnv *env, jobject cls, jobject cls2)
164 {
165 if (cls2 == NULL) {
166 JNU_ThrowNullPointerException(env, 0);
167 return JNI_FALSE;
168 }
169 return (*env)->IsAssignableFrom(env, cls2, cls);
170 }
171
172 JNIEXPORT jclass JNICALL
173 Java_java_lang_Class_getPrimitiveClass(JNIEnv *env,
174 jclass cls,
175 jstring name)
176 {
177 const char *utfName;
178 jclass result;
179
180 if (name == NULL) {
181 JNU_ThrowNullPointerException(env, 0);
182 return NULL;
183 }
184
185 utfName = (*env)->GetStringUTFChars(env, name, 0);
186 if (utfName == 0)
187 return NULL;
188
189 result = JVM_FindPrimitiveClass(env, utfName);
190
191 (*env)->ReleaseStringUTFChars(env, name, utfName);
192
193 return result;
194 }