/* Return the combined suspend policy for the event set
*/
static jboolean
enumForCombinedSuspendPolicy(void *cv, void *arg)
{
CommandSingle *command = cv;
jbyte thisPolicy;
jbyte *policy = arg;
switch(command->singleKind) {
case COMMAND_SINGLE_EVENT:
thisPolicy = command->u.eventCommand.suspendPolicy;
break;
case COMMAND_SINGLE_FRAME_EVENT:
thisPolicy = command->u.frameEventCommand.suspendPolicy;
break;
default:
thisPolicy = JDWP_SUSPEND_POLICY(NONE);
}
/* Expand running policy value if this policy demands it */
if (*policy == JDWP_SUSPEND_POLICY(NONE)) {
*policy = thisPolicy;
} else if (*policy == JDWP_SUSPEND_POLICY(EVENT_THREAD)) {
*policy = (thisPolicy == JDWP_SUSPEND_POLICY(ALL))?
thisPolicy : *policy;
}
/* Short circuit if we reached maximal suspend policy */
if (*policy == JDWP_SUSPEND_POLICY(ALL)) {
return JNI_FALSE;
} else {
return JNI_TRUE;
}
}
static void
handleReportVMInitCommand(JNIEnv* env, ReportVMInitCommand *command)
{
PacketOutputStream out;
if (command->suspendPolicy == JDWP_SUSPEND_POLICY(ALL)) {
(void)threadControl_suspendAll();
} else if (command->suspendPolicy == JDWP_SUSPEND_POLICY(EVENT_THREAD)) {
(void)threadControl_suspendThread(command->thread, JNI_FALSE);
}
outStream_initCommand(&out, uniqueID(), 0x0,
JDWP_COMMAND_SET(Event),
JDWP_COMMAND(Event, Composite));
(void)outStream_writeByte(&out, command->suspendPolicy);
(void)outStream_writeInt(&out, 1); /* Always one component */
(void)outStream_writeByte(&out, JDWP_EVENT(VM_INIT));
(void)outStream_writeInt(&out, 0); /* Not in response to an event req. */
(void)outStream_writeObjectRef(env, &out, command->thread);
outStream_sendCommand(&out);
outStream_destroy(&out);
/* Why aren't we tossing this: tossGlobalRef(env, &(command->thread)); */
}
jbyte
eventHelper_reportEvents(jbyte sessionID, struct bag *eventBag)
{
int size = bagSize(eventBag);
jbyte suspendPolicy = JDWP_SUSPEND_POLICY(NONE);
jboolean reportingVMDeath = JNI_FALSE;
jboolean wait;
int command_size;
HelperCommand *command;
ReportEventCompositeCommand *recc;
struct singleTracker tracker;
if (size == 0) {
return suspendPolicy;
}
(void)bagEnumerateOver(eventBag, enumForCombinedSuspendPolicy, &suspendPolicy);
(void)bagEnumerateOver(eventBag, enumForVMDeath, &reportingVMDeath);
/*LINTED*/
command_size = (int)(sizeof(HelperCommand) +
sizeof(CommandSingle)*(size-1));
command = jvmtiAllocate(command_size);
(void)memset(command, 0, command_size);
command->commandKind = COMMAND_REPORT_EVENT_COMPOSITE;
command->sessionID = sessionID;
recc = &command->u.reportEventComposite;
recc->suspendPolicy = suspendPolicy;
recc->eventCount = size;
tracker.recc = recc;
tracker.index = 0;
(void)bagEnumerateOver(eventBag, enumForCopyingSingles, &tracker);
/*
* We must wait if this thread (the event thread) is to be
* suspended or if the VM is about to die. (Waiting in the latter
* case ensures that we get the event out before the process dies.)
*/
wait = (jboolean)((suspendPolicy != JDWP_SUSPEND_POLICY(NONE)) ||
reportingVMDeath);
enqueueCommand(command, wait, reportingVMDeath);
return suspendPolicy;
}
static void
suspendWithInvokeEnabled(jbyte policy, jthread thread)
{
invoker_enableInvokeRequests(thread);
if (policy == JDWP_SUSPEND_POLICY(ALL)) {
(void)threadControl_suspendAll();
} else {
(void)threadControl_suspendThread(thread, JNI_FALSE);
}
}
/*
* If the command that we are about to execute has a suspend-all
* policy, then prepare for either ThreadReferenceImpl.c: resume()
* or VirtualMachineImpl.c: resume() to be called.
*/
static jboolean
needBlockCommandLoop(HelperCommand *cmd) {
if (cmd->commandKind == COMMAND_REPORT_EVENT_COMPOSITE
&& cmd->u.reportEventComposite.suspendPolicy == JDWP_SUSPEND_POLICY(ALL)) {
debugMonitorEnter(blockCommandLoopLock);
blockCommandLoop = JNI_TRUE;
debugMonitorExit(blockCommandLoopLock);
return JNI_TRUE;
}
return JNI_FALSE;
}
static void
handleClassPrepare(JNIEnv *env, EventInfo *evinfo,
HandlerNode *node,
struct bag *eventBag)
{
jthread thread = evinfo->thread;
/* We try hard to avoid class loads/prepares in debugger
* threads, but it is still possible for them to happen (most
* likely for exceptions that are thrown within JNI
* methods). If such an event occurs, we must report it, but
* we cannot suspend the debugger thread.
*
* 1) We report the thread as NULL because we don't want the
* application to get hold of a debugger thread object.
* 2) We try to do the right thing wrt to suspending
* threads without suspending debugger threads. If the
* requested suspend policy is NONE, there's no problem. If
* the requested policy is ALL, we can just suspend all
* application threads without producing any surprising
* results by leaving the debugger thread running. However,
* if the requested policy is EVENT_THREAD, we are forced
* to do something different than requested. The most
* useful behavior is to suspend all application threads
* (just as if the policy was ALL). This allows the
* application to operate on the class before it gets into
* circulation and so it is preferable to the other
* alternative of suspending no threads.
*/
if (threadControl_isDebugThread(thread)) {
evinfo->thread = NULL;
if (node->suspendPolicy == JDWP_SUSPEND_POLICY(EVENT_THREAD)) {
node->suspendPolicy = JDWP_SUSPEND_POLICY(ALL);
}
}
eventHelper_recordEvent(evinfo, node->handlerID,
node->suspendPolicy, eventBag);
}
/*
* Initialize debugger back end modules
*/
static void
initialize(JNIEnv *env, jthread thread, EventIndex triggering_ei)
{
jvmtiError error;
EnumerateArg arg;
jbyte suspendPolicy;
LOG_MISC(("Begin initialize()"));
currentSessionID = 0;
initComplete = JNI_FALSE;
if ( gdata->vmDead ) {
EXIT_ERROR(AGENT_ERROR_INTERNAL,"VM dead at initialize() time");
}
/* Turn off the initial JVMTI event notifications */
error = set_event_notification(JVMTI_DISABLE, EI_EXCEPTION);
if (error != JVMTI_ERROR_NONE) {
EXIT_ERROR(error, "unable to disable JVMTI event notification");
}
error = set_event_notification(JVMTI_DISABLE, EI_VM_INIT);
if (error != JVMTI_ERROR_NONE) {
EXIT_ERROR(error, "unable to disable JVMTI event notification");
}
error = set_event_notification(JVMTI_DISABLE, EI_VM_DEATH);
if (error != JVMTI_ERROR_NONE) {
EXIT_ERROR(error, "unable to disable JVMTI event notification");
}
/* Remove initial event callbacks */
(void)memset(&(gdata->callbacks),0,sizeof(gdata->callbacks));
error = JVMTI_FUNC_PTR(gdata->jvmti,SetEventCallbacks)
(gdata->jvmti, &(gdata->callbacks), sizeof(gdata->callbacks));
if (error != JVMTI_ERROR_NONE) {
EXIT_ERROR(error, "unable to clear JVMTI callbacks");
}
commonRef_initialize();
util_initialize(env);
threadControl_initialize();
stepControl_initialize();
invoker_initialize();
debugDispatch_initialize();
classTrack_initialize(env);
debugLoop_initialize();
initMonitor = debugMonitorCreate("JDWP Initialization Monitor");
/*
* Initialize transports
*/
arg.isServer = isServer;
arg.error = JDWP_ERROR(NONE);
arg.startCount = 0;
transport_initialize();
(void)bagEnumerateOver(transports, startTransport, &arg);
/*
* Exit with an error only if
* 1) none of the transports was successfully started, and
* 2) the application has not yet started running
*/
if ((arg.error != JDWP_ERROR(NONE)) &&
(arg.startCount == 0) &&
initOnStartup) {
EXIT_ERROR(map2jvmtiError(arg.error), "No transports initialized");
}
eventHandler_initialize(currentSessionID);
signalInitComplete();
transport_waitForConnection();
suspendPolicy = suspendOnInit ? JDWP_SUSPEND_POLICY(ALL)
: JDWP_SUSPEND_POLICY(NONE);
if (triggering_ei == EI_VM_INIT) {
LOG_MISC(("triggering_ei == EI_VM_INIT"));
eventHelper_reportVMInit(env, currentSessionID, thread, suspendPolicy);
} else {
/*
* TO DO: Kludgy way of getting the triggering event to the
* just-attached debugger. It would be nice to make this a little
* cleaner. There is also a race condition where other events
* can get in the queue (from other not-yet-suspended threads)
* before this one does. (Also need to handle allocation error below?)
*/
EventInfo info;
struct bag *initEventBag;
LOG_MISC(("triggering_ei != EI_VM_INIT"));
initEventBag = eventHelper_createEventBag();
(void)memset(&info,0,sizeof(info));
info.ei = triggering_ei;
eventHelper_recordEvent(&info, 0, suspendPolicy, initEventBag);
(void)eventHelper_reportEvents(currentSessionID, initEventBag);
bagDestroyBag(initEventBag);
}
if ( gdata->vmDead ) {
EXIT_ERROR(AGENT_ERROR_INTERNAL,"VM dead before initialize() completes");
}
LOG_MISC(("End initialize()"));
}
static void
handleReportEventCompositeCommand(JNIEnv *env,
ReportEventCompositeCommand *recc)
{
PacketOutputStream out;
jint count = recc->eventCount;
jint i;
if (recc->suspendPolicy != JDWP_SUSPEND_POLICY(NONE)) {
/* must determine thread to interrupt before writing */
/* since writing destroys it */
jthread thread = NULL;
for (i = 0; i < count; i++) {
CommandSingle *single = &(recc->singleCommand[i]);
switch (single->singleKind) {
case COMMAND_SINGLE_EVENT:
thread = single->u.eventCommand.info.thread;
break;
case COMMAND_SINGLE_FRAME_EVENT:
thread = single->u.frameEventCommand.thread;
break;
}
if (thread != NULL) {
break;
}
}
if (thread == NULL) {
(void)threadControl_suspendAll();
} else {
suspendWithInvokeEnabled(recc->suspendPolicy, thread);
}
}
outStream_initCommand(&out, uniqueID(), 0x0,
JDWP_COMMAND_SET(Event),
JDWP_COMMAND(Event, Composite));
(void)outStream_writeByte(&out, recc->suspendPolicy);
(void)outStream_writeInt(&out, count);
for (i = 0; i < count; i++) {
CommandSingle *single = &(recc->singleCommand[i]);
switch (single->singleKind) {
case COMMAND_SINGLE_EVENT:
handleEventCommandSingle(env, &out,
&single->u.eventCommand);
break;
case COMMAND_SINGLE_UNLOAD:
handleUnloadCommandSingle(env, &out,
&single->u.unloadCommand);
break;
case COMMAND_SINGLE_FRAME_EVENT:
handleFrameEventCommandSingle(env, &out,
&single->u.frameEventCommand);
break;
}
}
outStream_sendCommand(&out);
outStream_destroy(&out);
}
