// Handle an interrupt from the VM.
void DebuggerProxy::interrupt(CmdInterrupt &cmd) {
TRACE_RB(2, "DebuggerProxy::interrupt\n");
// Make any breakpoints that have passed breakable again.
setBreakableForBreakpointsNotMatching(cmd);
// At this point we have an interrupt, but we don't know if we're on the
// thread the proxy considers "current".
// NB: BreakPointReached really means we've got control of a VM thread from
// the opcode hook. This could be for a breakpoint, stepping, etc.
// Wait until this thread is the one this proxy wants to debug.
if (!blockUntilOwn(cmd, true)) return;
// We know we're on the "current" thread, so we can process any active flow
// command, stop if we're at a breakpoint, handle other interrupts, etc.
if (checkFlowBreak(cmd)) {
// We've hit a breakpoint and now need to make sure that breakpoints
// won't be hit again for this site until control leaves this site.
// (Breakpoints can still get hit if control reaches this site during
// a call that is part of this site because the flags are stacked.)
unsetBreakableForBreakpointsMatching(cmd);
while (true) {
try {
// We're about to send the client an interrupt and start
// waiting for commands back from it. Disable signal polling
// during this time, since our protocol requires that only one
// thread talk to the client at a time.
disableSignalPolling();
SCOPE_EXIT { enableSignalPolling(); };
processInterrupt(cmd);
} catch (const DebuggerException &e) {
TRACE(2, "DebuggerException from processInterrupt!\n");
switchThreadMode(Normal);
throw;
} catch (...) {
TRACE(2, "Unknown exception from processInterrupt!\n");
assertx(false); // no other exceptions should be seen here
switchThreadMode(Normal);
throw;
}
if (cmd.getInterruptType() == PSPEnded) break;
if (!m_newThread) break; // we're not switching threads
switchThreadMode(Normal, m_newThread->m_id);
m_newThread.reset();
blockUntilOwn(cmd, false);
}
}
if ((m_threadMode == Normal) || (cmd.getInterruptType() == PSPEnded)) {
// If the thread mode is Normal we let other threads with
// interrupts go ahead and process them. We also do this when the
// thread is at PSPEnded because the thread is done.
switchThreadMode(Normal);
}
}
// Handle an interrupt from the VM.
void DebuggerProxy::interrupt(CmdInterrupt &cmd) {
TRACE(2, "DebuggerProxy::interrupt\n");
changeBreakPointDepth(cmd);
if (cmd.getInterruptType() == BreakPointReached) {
if (!needInterrupt()) return;
// NB: stepping is represented as a BreakPointReached interrupt.
// Modify m_lastLocFilter to save current location. This will short-circuit
// the work done up in phpDebuggerOpcodeHook() and ensure we don't break on
// this line until we're completely off of it.
InterruptSite *site = cmd.getSite();
if (g_vmContext->m_lastLocFilter) {
g_vmContext->m_lastLocFilter->clear();
} else {
g_vmContext->m_lastLocFilter = new VM::PCFilter();
}
if (debug && Trace::moduleEnabled(Trace::bcinterp, 5)) {
Trace::trace("prepare source loc filter\n");
const VM::OffsetRangeVec& offsets = site->getCurOffsetRange();
for (VM::OffsetRangeVec::const_iterator it = offsets.begin();
it != offsets.end(); ++it) {
Trace::trace("block source loc in %s:%d: unit %p offset [%d, %d)\n",
site->getFile(), site->getLine0(),
site->getUnit(), it->m_base, it->m_past);
}
}
g_vmContext->m_lastLocFilter->addRanges(site->getUnit(),
site->getCurOffsetRange());
// If the breakpoint is not to be processed, we should continue execution.
BreakPointInfoPtr bp = getBreakPointAtCmd(cmd);
if (bp) {
if (!bp->breakable(getRealStackDepth())) {
return;
} else {
bp->unsetBreakable(getRealStackDepth());
}
}
}
// Wait until this thread is the thread this proxy wants to debug.
// NB: breakpoints and control flow checks happen here, too, and return false
// if we're not done with the flow, or not at a breakpoint, etc.
if (!blockUntilOwn(cmd, true)) {
return;
}
if (processFlowBreak(cmd)) {
while (true) {
try {
Lock lock(m_signalMutex);
m_signum = CmdSignal::SignalNone;
processInterrupt(cmd);
} catch (const DebuggerException &e) {
switchThreadMode(Normal);
throw;
} catch (...) {
assert(false); // no other exceptions should be seen here
switchThreadMode(Normal);
throw;
}
if (cmd.getInterruptType() == PSPEnded) {
switchThreadMode(Normal);
return; // we are done with this thread
}
if (!m_newThread) {
break; // we're not switching threads
}
switchThreadMode(Normal, m_newThread->m_id);
blockUntilOwn(cmd, false);
}
}
if (m_threadMode == Normal) {
Lock lock(this);
m_thread = 0;
notify();
} else if (cmd.getInterruptType() == PSPEnded) {
switchThreadMode(Normal); // we are done with this thread
}
}
