1 /*
2  * Copyright (c) 1999, 2005, 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 #include <stdatomic.h>
27 
28 #include "util.h"
29 #include "DDMImpl.h"
30 #include "inStream.h"
31 #include "outStream.h"
32 
33 static _Atomic(jboolean) ddmIsActive = ATOMIC_VAR_INIT(JNI_FALSE);
34 
35 static void
SendDdmBroadcast(JNIEnv * env,jboolean connected)36 SendDdmBroadcast(JNIEnv* env, jboolean connected)
37 {
38   WITH_LOCAL_REFS(env, 2) {
39     jclass ddm_class = JNI_FUNC_PTR(env,FindClass)(env, "org/apache/harmony/dalvik/ddmc/DdmServer");
40     if (JNI_FUNC_PTR(env,ExceptionCheck)(env)) {
41       JNI_FUNC_PTR(env,ExceptionClear)(env);
42       goto end;
43     }
44     jmethodID broadcast = JNI_FUNC_PTR(env,GetStaticMethodID)(env, ddm_class, "broadcast", "(I)V");
45     if (broadcast == NULL) {
46       ERROR_MESSAGE(("JDWP Cannot find DdmServer.broadcast(I)V method!"));
47       JNI_FUNC_PTR(env,ExceptionDescribe)(env);
48       JNI_FUNC_PTR(env,ExceptionClear)(env);
49       goto end;
50     }
51     jint event =
52         connected == JNI_TRUE ? 1 /* DdmServer.CONNECTED */ : 2 /*DdmServer.DISCONNECTED */;
53     JNI_FUNC_PTR(env,CallStaticVoidMethod)(env, ddm_class, broadcast, event);
54     if (JNI_FUNC_PTR(env,ExceptionCheck)(env)) {
55       LOG_ERROR(("DdmServer.broadcast %d failed", event));
56       JNI_FUNC_PTR(env,ExceptionDescribe)(env);
57       JNI_FUNC_PTR(env,ExceptionClear)(env);
58     }
59     if (!connected) {
60       // If we are disconnecting we also need to call DdmVmInternal.threadNotify(false)
61       jclass ddm_vm_internal =
62           JNI_FUNC_PTR(env,FindClass)(env, "org/apache/harmony/dalvik/ddmc/DdmVmInternal");
63       jmethodID thread_notify =
64           JNI_FUNC_PTR(env,GetStaticMethodID)(env, ddm_vm_internal, "threadNotify", "(Z)V");
65       if (thread_notify == NULL) {
66         ERROR_MESSAGE(("JDWP Cannot find DdmVmInternal.threadNotify(Z)V method!"));
67         JNI_FUNC_PTR(env,ExceptionDescribe)(env);
68         JNI_FUNC_PTR(env,ExceptionClear)(env);
69         goto end;
70       }
71       JNI_FUNC_PTR(env,CallStaticVoidMethod)(env, ddm_vm_internal, thread_notify, JNI_FALSE);
72       if (JNI_FUNC_PTR(env,ExceptionCheck)(env)) {
73         LOG_ERROR(("DdmVmInternal.threadNotify(false) failed"));
74         JNI_FUNC_PTR(env,ExceptionDescribe)(env);
75         JNI_FUNC_PTR(env,ExceptionClear)(env);
76       }
77     }
78 end: ;
79   } END_WITH_LOCAL_REFS(env);
80 }
81 
82 static jboolean
chunk(PacketInputStream * in,PacketOutputStream * out)83 chunk(PacketInputStream *in, PacketOutputStream *out)
84 {
85     int i;
86     jint type_in;
87     jint type_out;
88     jint len_in;
89     jint len_out;
90     jbyte* data_in;
91     jbyte* data_out;
92     jvmtiError error;
93 
94     type_in = inStream_readInt(in);
95     len_in = inStream_readInt(in);
96     data_in = inStream_readBytes(in, len_in, (jbyte*)jvmtiAllocate(len_in));
97 
98     if (inStream_error(in)) {
99         return JNI_TRUE;
100     }
101 
102     if (gdata->ddm_process_chunk == NULL) {
103         jvmtiDeallocate(data_in);
104         outStream_setError(out, JDWP_ERROR(NOT_IMPLEMENTED));
105         return JNI_TRUE;
106     }
107 
108     jboolean ddm_newly_active = !atomic_exchange(&ddmIsActive, JNI_TRUE);
109     if (ddm_newly_active) {
110       SendDdmBroadcast(getEnv(), /* connected */JNI_TRUE);
111     }
112 
113     LOG_JVMTI(("com.android.art.internal.ddm.process_chunk()"));
114     error = gdata->ddm_process_chunk(gdata->jvmti,
115                                      type_in,
116                                      len_in,
117                                      data_in,
118                                      &type_out,
119                                      &len_out,
120                                      &data_out);
121 
122     jvmtiDeallocate(data_in);
123 
124     if (error != JVMTI_ERROR_NONE) {
125         // For backwards-compatibility we do not actually return any error or any data at all
126         // here.
127         LOG_MISC(("Suppressing error from com.android.art.internal.ddm.process_chunk for backwards "
128                   "compatibility. Error was %s (%d)", jvmtiErrorText(error), error));
129         return JNI_TRUE;
130     }
131 
132     outStream_writeInt(out, type_out);
133     outStream_writeByteArray(out, len_out, data_out);
134     jvmtiDeallocate(data_out);
135 
136     return JNI_TRUE;
137 }
138 
DDM_initialize(void)139 void DDM_initialize(void)
140 {
141   atomic_exchange(&ddmIsActive, gdata->ddmInitiallyActive);
142 }
143 
DDM_onDisconnect(void)144 void DDM_onDisconnect(void)
145 {
146   jboolean was_active = atomic_exchange(&ddmIsActive, JNI_FALSE);
147   if (was_active) {
148     JNIEnv* env = getEnv();
149     SendDdmBroadcast(getEnv(), /*connected*/ JNI_FALSE);
150   }
151 }
152 
153 void *DDM_Cmds[] = { (void *)1
154     ,(void *)chunk
155 };
156