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