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// sprit-forth: A portable subroutine-threaded Forth.
// Copyright (C) 2023 Clyne Sullivan <clyne@bitgloo.com>
//
// This library is free software; you can redistribute it and/or modify it
// under the terms of the GNU Library General Public License as published by
// the Free Software Foundation; either version 2 of the License, or (at your
// option) any later version.
//
// This library 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 Library General Public License for
// more details.
//
// You should have received a copy of the GNU Library General Public License
// along with this library; if not, write to the Free Software Foundation, Inc.,
// 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
#ifndef STATE_HPP
#define STATE_HPP
#include "types.hpp"
constexpr Addr DS = 16; /** Data stack size */
constexpr Addr RS = 16; /** Return stack size */
constexpr auto DictSize = 4096u; /** Dictionary size */
constexpr Addr DIdxBase = 0;
constexpr Addr DIdxHere = 1;
constexpr Addr DIdxLatest = 2;
constexpr Addr DIdxState = 3;
constexpr Addr DIdxCompXt = 4;
constexpr Addr DIdxSource = 5;
constexpr Addr DIdxSrcLen = 6;
constexpr Addr DIdxInBuf = 7;
constexpr Addr DIdxBegin = DIdxInBuf + 80 * sizeof(char);
/**
* Memory chunk used to store the dictoinary and stacks.
*/
extern std::array<Cell, DictSize> DICT;
extern Cell& HERE; /** Linked to HERE's storage in DICT. */
extern Cell& LATEST; /** Linked to LATEST's storage in DICT. */
extern Cell& STATE; /** Linked to STATE's storage in DICT. */
extern Cell *SP; /** Data stack pointer */
extern Cell *RP; /** Return stack pointer */
extern FuncList IP; /** Instruction pointer */
/**
* Initializes the dictionary to default values.
* @param wordset The initial WordSet of pre-defined words.
*/
inline void initialize(const auto& wordset)
{
DICT[DIdxBase] = 10;
DICT[DIdxHere] = (Cell)&DICT[DIdxBegin];
DICT[DIdxLatest] = (Cell)wordset.latest;
DICT[DIdxState] = 0;
}
/**
* Begins execution with the given function pointer list.
* @param list Function pointer list to execute
*/
void executor(FuncList *list);
/**
* Executes the given word by calling executor on its definition.
* @param word The word to execute
*/
void execute1(Word *word);
/**
* Looks up the definition of the given word.
* @param s The name of the word to find
* @param len The character count of the word's name
* @return Pointer to the word's definition or nullptr if not found
*/
Word *find(const char *s, int len);
#endif // STATE_HPP
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