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/*
* debugserver.cc: handle usecode debugging messages from client
*
* Copyright (C) 2002-2022 The Exult Team
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#if (defined(USE_EXULTSTUDIO) && defined(USECODE_DEBUGGER))
# include "debugmsg.h"
# include "debugserver.h"
# include "endianio.h"
# include "gamewin.h"
# include "servemsg.h"
# include "server.h"
# include "stackframe.h"
# include "ucdebugging.h"
# include "ucfunction.h"
# include "ucinternal.h"
# include "ucserial.h"
# include "useval.h"
# include <algorithm>
# include <iomanip>
# include <iostream>
# include <sstream>
using std::ios;
using std::stringstream;
// message handler that only handles debugging messages.
void Handle_client_debug_message(int& fd) {
unsigned char data[Exult_server::maxlength];
Exult_server::Msg_type id;
const int datalen = Exult_server::Receive_data(fd, id, data, sizeof(data));
if (datalen < 0) {
return;
}
switch (id) {
case Exult_server::usecode_debugging:
Handle_debug_message(&data[0], datalen);
break;
default:
// maybe reply something like "unable to handle message" ?
break;
}
}
void Handle_debug_message(unsigned char* data, int datalen) {
ignore_unused_variable_warning(datalen);
Usecode_machine* ucm = Game_window::get_instance()->get_usecode();
auto* uci = dynamic_cast<Usecode_internal*>(ucm);
if (uci == nullptr) {
return; // huh?
}
auto id = static_cast<Exult_server::Debug_msg_type>(data[0]);
const unsigned char* ptr = data;
if (uci->is_on_breakpoint()) {
// accept extra messages now
switch (id) {
case Exult_server::dbg_continue:
uci->set_breakpoint_action(0);
break;
case Exult_server::dbg_stepinto:
uci->set_breakpoint_action(0);
uci->set_breakpoint();
break;
case Exult_server::dbg_stepover:
uci->set_breakpoint_action(0);
uci->dbg_stepover();
break;
case Exult_server::dbg_finish:
uci->set_breakpoint_action(0);
uci->dbg_finish();
break;
case Exult_server::dbg_get_callstack: {
unsigned char d[3];
d[0] = static_cast<unsigned char>(Exult_server::dbg_callstack);
unsigned char* ptr = &d[1];
const int callstacksize = uci->get_callstack_size();
little_endian::Write2(ptr, callstacksize);
Exult_server::Send_data(
client_socket, Exult_server::usecode_debugging, d, 3);
for (int i = 0; i < callstacksize; i++) {
Stack_frame* frame = uci->get_stackframe(i);
Stack_frame_out(
client_socket, frame->function->id,
static_cast<int>(frame->ip - frame->code),
frame->call_chain, frame->call_depth, frame->eventid,
reinterpret_cast<uintptr>(frame->caller_item.get()),
frame->num_args, frame->num_vars, frame->locals);
}
break;
}
case Exult_server::dbg_get_stack: {
const Usecode_value zeroval(0);
stringstream dataio(ios::in | ios::out | ios::binary);
OStreamDataSource ds(&dataio);
ds.write1(static_cast<unsigned char>(Exult_server::dbg_stack));
const int stacksize = uci->get_stack_size();
ds.write2(stacksize);
for (int i = 0; i < stacksize; i++) {
Usecode_value* val = uci->peek_stack(i);
if (val && !val->save(&ds)) {
std::cerr
<< "Error: Could not save usecode value to message!"
<< std::endl;
}
if (ds.getSize() >= Exult_server::maxlength) {
break;
}
}
if (ds.getSize() > Exult_server::maxlength) {
std::cerr << "Error: stack larger than max. message!"
<< std::endl;
}
std::string data(dataio.str());
const auto* dptr
= reinterpret_cast<const unsigned char*>(data.data());
const int datalen = std::min(
static_cast<int>(data.size()), Exult_server::maxlength);
Exult_server::Send_data(
client_socket, Exult_server::usecode_debugging, dptr,
datalen);
break;
}
default:
break;
}
}
// these messages can always be handled
switch (id) {
case Exult_server::dbg_break:
uci->set_breakpoint();
break;
case Exult_server::dbg_get_status: {
unsigned char c;
if (uci->is_on_breakpoint()) {
c = static_cast<unsigned char>(Exult_server::dbg_on_breakpoint);
} else {
c = static_cast<unsigned char>(Exult_server::dbg_continuing);
}
Exult_server::Send_data(
client_socket, Exult_server::usecode_debugging, &c, 1);
break;
}
case Exult_server::dbg_set_location_bp: {
ptr++;
const int funcid = little_endian::Read4(ptr);
const int ip = little_endian::Read4(ptr);
std::cout << "Setting breakpoint at " << std::hex << std::setfill('0')
<< std::setw(4) << funcid << ", " << std::setw(4) << ip
<< std::setfill(' ') << std::dec << std::endl;
// +++++ check for duplicates?
const int breakpoint_id = uci->set_location_breakpoint(funcid, ip);
unsigned char d[13];
d[0] = static_cast<unsigned char>(Exult_server::dbg_set_location_bp);
unsigned char* dptr = &d[1];
little_endian::Write4(dptr, funcid);
little_endian::Write4(dptr, ip);
little_endian::Write4(dptr, breakpoint_id);
Exult_server::Send_data(
client_socket, Exult_server::usecode_debugging, d, 13);
break;
}
case Exult_server::dbg_clear_breakpoint: {
ptr++;
const int breakpoint_id = little_endian::Read4(ptr);
const bool ok = uci->clear_breakpoint(breakpoint_id);
if (ok) {
// reply
Exult_server::Send_data(
client_socket, Exult_server::usecode_debugging, data, 5);
}
break;
}
case Exult_server::dbg_get_breakpoints: {
uci->transmit_breakpoints(client_socket);
break;
}
default:
break;
}
}
#endif
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