mips/masm/tab.h

/* Copyright (c) 2024 Freya Murphy */

#ifndef __TAB_H__
#define __TAB_H__

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

#include "lex.h"

///
/// Symbol table
///

#define SYM_SEC_STUB   (UINT32_MAX)

enum symbol_type {
	SYM_LOCAL,
	SYM_GLOBAL,
	SYM_EXTERN,
};

struct symbol {
	// the offset of the symbol in a section
	uint32_t offset;
	// the index of section the symbol is in
	uint32_t secidx;
	// index into this table
	uint32_t tabidx;
	// the name of the symbol
	struct string name;
	// type
	enum symbol_type type;
};

struct symbol_table {
	// length in size in sym ammt
	size_t len;
	size_t size;

	// symbols
	struct symbol *symbols;
};

/* initalize a symbol table */
int symtab_init(struct symbol_table *symtab);

/* free the symbol table */
void symtab_free(struct symbol_table *symtab);

/* add a symbol to the symbol tbl */
int symtab_push(struct symbol_table *symtab, struct symbol *sym);

/* find a symbol by name in the symbol table */
int symtab_find(struct symbol_table *symtab, struct symbol **sym,
		const char *name);
/* find an existing symbol with a name or stub a temp one */
int symtab_find_or_stub(struct symbol_table *symtab, struct symbol **sym,
			const struct string *const name);

///
/// Reference table
///

enum reference_type {
	REF_NONE,
	REF_MIPS_16,
	REF_MIPS_26,
	REF_MIPS_PC16,
	REF_MIPS_LO16,
	REF_MIPS_HI16,
};

struct reference {
	enum reference_type type;
	struct symbol *symbol;
	uint32_t offset;
};

struct reference_table {
	// size
	size_t len;
	size_t size;

	// references
	struct reference *references;
};

/* initalize a reference table */
int reftab_init(struct reference_table *reftab);

/* free the reference table */
void reftab_free(struct reference_table *reftab);

/* add a reference to the reference tbl */
int reftab_push(struct reference_table *reftab, struct reference *ref);

#endif /* __TAB_H__ */