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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* 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 3 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, see <http://www.gnu.org/licenses/>.
*
*/
#include "ultima/ultima8/usecode/uc_process.h"
#include "ultima/ultima8/usecode/uc_machine.h"
#include "ultima/ultima8/usecode/usecode.h"
#include "ultima/ultima8/games/game_data.h"
namespace Ultima {
namespace Ultima8 {
DEFINE_RUNTIME_CLASSTYPE_CODE(UCProcess)
UCProcess::UCProcess() : Process(), _classId(0xFFFF), _ip(0xFFFF),
_bp(0x0000), _temp32(0) { // !! fixme
_usecode = GameData::get_instance()->getMainUsecode();
}
UCProcess::UCProcess(uint16 classid, uint16 offset, uint32 this_ptr,
int thissize, const uint8 *args, int argsize)
: Process(), _classId(0xFFFF), _ip(0xFFFF), _bp(0x0000), _temp32(0) {
_usecode = GameData::get_instance()->getMainUsecode();
load(classid, offset, this_ptr, thissize, args, argsize);
}
UCProcess::~UCProcess() {
}
void UCProcess::load(uint16 classid, uint16 offset, uint32 this_ptr,
int thissize, const uint8 *args, int argsize) {
if (_usecode->get_class_size(classid) == 0)
warning("Class is empty.");
_classId = 0xFFFF;
_ip = 0xFFFF;
_bp = 0x0000;
uint16 thissp = 0;
// first, push the derefenced this pointer
if (this_ptr != 0 && thissize > 0) {
_stack.addSP(-thissize);
UCMachine::get_instance()->
dereferencePointer(this_ptr, _stack.access(), thissize);
thissp = _stack.getSP();
}
// next, push the arguments
_stack.push(args, argsize);
// then, push the new this pointer
if (thissp != 0)
_stack.push4(UCMachine::stackToPtr(_pid, thissp));
// finally, call the specified function
call(classid, offset);
}
void UCProcess::run() {
if (_flags & PROC_SUSPENDED)
return;
// pass to UCMachine for execution
UCMachine::get_instance()->execProcess(this);
}
void UCProcess::call(uint16 classid, uint16 offset) {
_stack.push2(_classId); // BP+04 prev class
_stack.push2(_ip); // BP+02 prev IP
_stack.push2(_bp); // BP+00 prev BP
_classId = classid;
_ip = offset;
_bp = static_cast<uint16>(_stack.getSP()); // TRUNCATES!
}
bool UCProcess::ret() {
_stack.setSP(_bp);
_bp = _stack.pop2();
_ip = _stack.pop2();
_classId = _stack.pop2();
if (_ip == 0xFFFF && _classId == 0xFFFF)
return true;
else
return false;
}
void UCProcess::freeOnTerminate(uint16 index, int type) {
assert(type >= 1 && type <= 3);
Common::Pair<uint16, int> p;
p.first = index;
p.second = type;
_freeOnTerminate.push_back(p);
}
void UCProcess::terminate() {
Std::list<Common::Pair<uint16, int> >::iterator i;
for (i = _freeOnTerminate.begin(); i != _freeOnTerminate.end(); ++i) {
uint16 index = (*i).first;
int typeNum = (*i).second;
switch (typeNum) {
case 1: // string
UCMachine::get_instance()->freeString(index);
break;
case 2: // stringlist
UCMachine::get_instance()->freeStringList(index);
break;
case 3: // list
UCMachine::get_instance()->freeList(index);
break;
}
}
_freeOnTerminate.clear();
Process::terminate();
}
Common::String UCProcess::dumpInfo() const {
Common::String info = Process::dumpInfo();
if (_classId == 0xFFFF) {
info += ", IP undefined";
} else {
const char *classname = GameData::get_instance()->getMainUsecode()->
get_class_name(_classId);
info += Common::String::format(", classname: %s, IP: %04X:%04X", classname, _classId, _ip);
}
return info;
}
void UCProcess::saveData(Common::WriteStream *ws) {
Process::saveData(ws);
ws->writeUint16LE(_bp);
ws->writeUint16LE(_classId);
ws->writeUint16LE(_ip);
ws->writeUint32LE(_temp32);
ws->writeUint32LE(static_cast<uint32>(_freeOnTerminate.size()));
Std::list<Common::Pair<uint16, int> >::iterator iter;
for (iter = _freeOnTerminate.begin(); iter != _freeOnTerminate.end(); ++iter) {
ws->writeUint16LE(iter->first);
ws->writeUint32LE(static_cast<uint32>(iter->second));
}
_stack.save(ws);
}
bool UCProcess::loadData(Common::ReadStream *rs, uint32 version) {
if (!Process::loadData(rs, version)) return false;
_bp = rs->readUint16LE();
_classId = rs->readUint16LE();
_ip = rs->readUint16LE();
_temp32 = rs->readUint32LE();
uint32 freecount = rs->readUint32LE();
for (unsigned int i = 0; i < freecount; ++i) {
Common::Pair<uint16, int> p;
p.first = rs->readUint16LE();
p.second = static_cast<int>(rs->readUint32LE());
_freeOnTerminate.push_back(p);
}
_stack.load(rs, version);
return true;
}
} // End of namespace Ultima8
} // End of namespace Ultima
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