types.h

/******************************************************************************
Copyright (c) 2019 Thomas Cort

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of this software and associated documentation files (the "Software"), to deal
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******************************************************************************/

#ifndef __TYPES_H
#define __TYPES_H

#include <stddef.h>
#include <stdint.h>

#include "const.h"

/* basic data type for storage (memory and stack) */
typedef int32_t cell_t;

struct stack {
	cell_t mem[STKSZ];	/* array of memory cells used by this stack */
	size_t sp;		/* stack pointer */
};
typedef struct stack stk_t;

struct call_stack {
	size_t mem[CSTKSZ];	/* array of memory cells used by this stack */
	size_t sp;		/* stack pointer */
};
typedef struct call_stack call_stk_t;

struct symbol {
	char label[LBLLN];	/* label name + '\0' */
	size_t lineno;		/* line on which the label appears */
};
typedef struct symbol symbol_t;

struct symtab {
	symbol_t symbols[SYMSZ];	/* stack of symbols */
	size_t sp;			/* pointer to top of stack */
};
typedef struct symtab symtab_t;

struct program {
	char lines[LNMAX][LNLEN];	/* store whole program text here */
	size_t sp;			/* pointer to last line */
};
typedef struct program program_t;

struct vm {
	cell_t memory[MEMSZ];		/* main memory */
	stk_t stack;			/* working stack */
	call_stk_t call_stack;	/* call stack */
	symtab_t symtab;		/* symbol table */
	program_t program;		/* text of program */
	size_t pc;			/* program counter */
	int done;			/* flag to indicate when to quit */
	char pad[4];
};
typedef struct vm vm_t;

struct operation {
	char code[4];
	char pad[4];
	void (*fn)(vm_t *vm);
};
typedef struct operation op_t;

#endif