symbol.h

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#ifndef CHIP8_SYMBOL_H
#define CHIP8_SYMBOL_H
 
#include <stdint.h>
#include <stdlib.h>
 
#define INSTRUCTION_COUNT 64
#define LABEL_CEILING 64
#define LABEL_IDENTIFIER_SIZE 20
#define SYMBOL_CEILING 64
 
/* Instruction strings */
#define S_CLS "CLS"
#define S_RET "RET"
#define S_JP "JP"
#define S_CALL "CALL"
#define S_SE "SE"
#define S_SNE "SNE"
#define S_LD "LD"
#define S_ADD "ADD"
#define S_OR "OR"
#define S_AND "AND"
#define S_SUB "SUB"
#define S_SHR "SHR"
#define S_SUBN "SUBN"
#define S_SHL "SHL"
#define S_RND "RND"
#define S_DRW "DRW"
#define S_SKP "SKP"
#define S_SKNP "SKNP"
#define S_XOR "XOR"
#define S_SCD "SCD"
#define S_SCR "SCR"
#define S_SCL "SCL"
#define S_EXIT "EXIT"
#define S_LOW "LOW"
#define S_HIGH "HIGH"
#define S_JP_V0 "JP V0,"
 
/* Reserved identifier strings */
#define S_K "K"
#define S_F "F"
#define S_B "B"
#define S_DT "DT"
#define S_ST "ST"
#define S_I "I"
#define S_IP "[I]"
#define S_DB ".DB"
#define S_DW ".DW"
#define S_DS ".DS"
#define S_HF "HF"
#define S_R "R"
 
typedef enum {
    I_NULL = -1,
    I_CLS,
    I_RET,
    I_JP,
    I_CALL,
    I_SE,
    I_SNE,
    I_LD,
    I_ADD,
    I_OR,
    I_AND,
    I_SUB,
    I_SHR,
    I_SUBN,
    I_SHL,
    I_RND,
    I_DRW,
    I_SKP,
    I_SKNP,
    I_XOR,
    I_SCD,
    I_SCR,
    I_SCL,
    I_EXIT,
    I_LOW,
    I_HIGH,
    I_JP_V0,
} Instruction;
 
typedef enum {
    SYM_NULL,
    SYM_DT,
    SYM_ST,
    SYM_I,
    SYM_IP,
    SYM_K,
    SYM_F,
    SYM_B,
    SYM_DB,
    SYM_DW,
    SYM_DS,
    SYM_HF,
    SYM_R,
    SYM_LABEL,
    SYM_INT,
    SYM_INT4,
    SYM_INT8,
    SYM_INT12,
    SYM_STRING,
    SYM_V,
    SYM_INSTRUCTION,
    SYM_LABEL_DEFINITION,
} Symbol;
 
typedef struct {
    Instruction cmd;
    uint16_t base;
    int pcount;
    Symbol ptype[3];
    uint16_t pmask[3];
} instruction_format_t;
 
typedef struct {
    int line;
    Instruction cmd;
    int pcount;
    Symbol ptype[3];
    int p[3];
    instruction_format_t* format;
} instruction_t;
 
typedef struct {
    char identifier[LABEL_IDENTIFIER_SIZE];
    int byte;
} label_t;
 
typedef struct {
    label_t* l;
    int len;
    int ceil;
} label_list_t;
 
typedef struct {
    Symbol type;
    uint16_t value;
    int ln;
} symbol_t;
 
typedef struct {
    symbol_t* s;
    int len;
    int ceil;
} symbol_list_t;
 
extern const char* c8_instructionStrings[];
extern const char* c8_identifierStrings[];
extern instruction_format_t formats[];
 
int build_instruction(instruction_t*, symbol_list_t*, int);
int is_comment(const char*);
int is_db(const char*);
int is_ds(const char*);
int is_dw(const char*);
int is_instruction(const char*);
int is_label_definition(const char*);
int is_label(const char*, const label_list_t*);
int is_register(const char*);
int is_reserved_identifier(const char*);
symbol_t* next_symbol(symbol_list_t*);
int populate_labels(label_list_t*);
int resolve_labels(symbol_list_t*, label_list_t*);
int shift(uint16_t);
int substitute_labels(symbol_list_t*, label_list_t*);
 
#endif