void XDebugServer::addCmdAndTrans(xdebug_xml_node& node) {
// lastcmd and lasttransid are not always set (for example when the
// connection is severed before the first command is sent)
if (m_lastCommand == Command::NONE || m_lastTransactionId == nullptr) {
return;
}
// TODO(#4489053) Change this when xml api is changed
char* command = const_cast<char*>(getCommandStr(m_lastCommand));
xdebug_xml_add_attribute_ex(&node, "command", command, 0, 0);
xdebug_xml_add_attribute_ex(&node, "transaction_id",
m_lastTransactionId, 0, 0);
}
void XDebugHook::onOpcode(PC pc) {
auto server = XDEBUG_GLOBAL(Server);
if (server == nullptr) {
return;
}
// Likely case is that there was no break command.
auto brk = server->getAndClearBreak();
if (LIKELY(brk == nullptr)) {
return;
}
server->log("Request thread received break command");
VMRegAnchor anchor;
auto const unit = vmfp()->func()->unit();
auto const line = unit->getLineNumber(unit->offsetOf(pc));
auto const filepath = const_cast<StringData*>(unit->filepath());
auto const transpath = File::TranslatePath(String(filepath));
// XDebugServer::breakpoint will send the response for the command before the
// break command, but we first need to send a response for the break command.
auto response = xdebug_xml_node_init("response");
server->addXmlns(*response);
auto const& cmd_str = brk->getCommandStr();
auto const& trans_id = brk->getTransactionId();
// Manually add status and reason. XDebugServer still thinks we're running
// because we haven't run XDebugServer::breakpoint yet.
xdebug_xml_add_attribute(response, "status", "break");
xdebug_xml_add_attribute(response, "reason", "ok");
// Ditto with command, XDebugServer is tracking the command before the break.
xdebug_xml_add_attribute_dup(response, "command", cmd_str.data());
xdebug_xml_add_attribute_dup(response, "transaction_id", trans_id.data());
delete brk;
server->sendMessage(*response);
xdebug_xml_node_dtor(response);
// Now we can go into a command loop.
server->breakpoint(transpath, init_null(), init_null(), line);
}
void XDebugServer::pollSocketLoop() {
while (true) {
// Take some load off the CPU when polling thread is paused.
std::this_thread::sleep_for(std::chrono::seconds(1));
// XXX: This can take the lock even when we want to pause the thread.
std::lock_guard<std::mutex> lock(m_pollingMtx);
// We're paused if the request thread is handling commands right now.
if (m_pausePollingThread.load()) {
continue;
}
// We've been told to exit.
if (m_stopPollingThread.load()) {
log("Polling thread stopping\n");
break;
}
// At this point we know that the request thread is busy running, so we let
// it enter the jit.
m_requestThread->m_reqInjectionData.setDebuggerIntr(false);
if (m_bufferAvail == 0) {
// Check if there is any input waiting on us.
if (!poll_socket(m_socket)) {
continue;
}
// Actually get the input from the socket.
if (!readInput()) {
log("Polling thread had input but failed to read it\n");
continue;
}
}
try {
log("Polling thread received: %s\n", m_bufferCur);
auto cmd = parseCommand();
if (cmd->getCommandStr() != "break") {
delete cmd;
continue;
}
log("Received break command\n");
// We're going to set the 'break' flag on our XDebugServer, and pause
// ourselves. The request thread will unpause us when it exits its
// command loop.
m_pausePollingThread.store(true);
auto const old = m_break.exchange(cmd);
always_assert(old == nullptr);
// Force request thread to run in the interpreter, and hit
// XDebugHookHandler::onOpcode().
m_requestThread->m_reqInjectionData.setDebuggerIntr(true);
m_requestThread->m_reqInjectionData.setFlag(DebuggerSignalFlag);
} catch (const XDebugExn&) {
log("Polling thread got invalid command: %s\n", m_bufferCur);
// Can drop the error.
}
}
}