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/*
* stackframe.h - a usecode interpreter stack frame
*
* 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.
*/
#ifndef STACKFRAME_H
#define STACKFRAME_H
#include "common_types.h"
#include "useval.h"
#include <iosfwd>
#include <memory>
class Game_object;
class Usecode_function;
using Game_object_shared = std::shared_ptr<Game_object>;
class Stack_frame {
public:
Stack_frame(
Usecode_function* fun, int event, Game_object* caller, int chain,
int depth);
~Stack_frame();
Usecode_function* function;
const uint8* ins_ip; // IP for current instruction
const uint8* ip; // current IP
const uint8* data; // pointer to start of data segment
const uint8* externs; // pointer to start of externs
const uint8* code; // pointer to (actual) code
const uint8* endp; // pointer directly past code segment
int line_number; // if debugging info present
// should probably add source filename?
int call_chain; // unique ID for this call chain
int call_depth; // zero for top level function
int num_externs;
int num_args;
int num_vars;
Usecode_value* locals;
int eventid;
Game_object_shared caller_item;
Usecode_value* save_sp;
Usecode_value& get_this() {
return locals[num_args - 1];
}
static int LastCallChainID;
static int getCallChainID() {
return ++LastCallChainID;
}
};
std::ostream& operator<<(std::ostream& out, Stack_frame& frame);
#endif
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