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%{
#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <getopt.h>
size_t line_number = 1;
extern int yylex();
extern int yyparse();
extern FILE *yyin;
void yyerror(const char *s);
%}
%union {
int i_val;
char *s_val;
char *symbol;
char *modifier;
char *directive;
}
%token <i_val> T_INTEGER
%token <s_val> T_STRING
%token <symbol> T_SYMBOL
%token <directive> T_DIRECTIVE
%token <symbol> T_LABEL
%token <modifier> T_MODIFIER
%token T_ENDL
%token T_COMMA
%token T_OPENPAREN
%token T_CLOSEPAREN
%%
asm:
statements
;
statements:
statements statement
| statement
;
statement:
label
| directives
| instructions
| T_ENDL
;
label:
T_LABEL T_ENDL
{
printf("Found Label: %s\n", $1);
};
instructions:
rb_type
| i_type
| s_type
| u_type
| j_type
| i_type_modifier
| s_type_modifier
| pseudo_type
;
rb_type:
T_SYMBOL T_SYMBOL T_COMMA T_SYMBOL T_COMMA T_SYMBOL T_ENDL
{
printf("Read instruction: %s(%s, %s, %s)\n", $1, $2, $4, $6);
};
i_type:
T_SYMBOL T_SYMBOL T_COMMA T_SYMBOL T_COMMA T_INTEGER T_ENDL
{
printf("Read instruction: %s(%s, %s, %d)\n", $1, $2, $4, $6);
};
i_type_modifier:
T_SYMBOL T_SYMBOL T_COMMA T_SYMBOL T_COMMA T_MODIFIER T_OPENPAREN T_SYMBOL T_CLOSEPAREN T_ENDL
{
printf("Read instruction: %s(%s, %s, %s of %s)\n", $1, $2, $4, $6, $8);
};
s_type:
T_SYMBOL T_SYMBOL T_COMMA T_INTEGER T_OPENPAREN T_SYMBOL T_CLOSEPAREN T_ENDL
{
printf("Read instruction: %s(%s, %s + %d)\n", $1, $2, $6, $4);
};
s_type_modifier:
T_SYMBOL T_SYMBOL T_COMMA T_MODIFIER T_OPENPAREN T_SYMBOL T_CLOSEPAREN T_ENDL
{
printf("Read instruction: %s(%s, %s of %s)\n", $1, $2, $4, $6);
};
u_type:
T_SYMBOL T_SYMBOL T_COMMA T_INTEGER T_ENDL
{
printf("Read instruction: %s(%s, %d)\n", $1, $2, $4);
};
j_type:
T_SYMBOL T_SYMBOL T_COMMA T_SYMBOL T_ENDL
{
printf("Read instruction: %s(%s, %s)\n", $1, $2, $4);
};
pseudo_type:
T_SYMBOL T_SYMBOL T_ENDL
{
printf("Read Pseudo Instruction: %s(%s)\n", $1, $2);
};
directives:
directive_int
| directive_string
;
directive_int:
T_DIRECTIVE T_INTEGER T_ENDL
{
printf("Read directive %s %d\n", $1, $2);
};
directive_string:
T_DIRECTIVE T_STRING T_ENDL
{
printf("Read directive %s %s\n", $1, $2);
};
%%
void yyerror(const char *s) {
printf("Parser Error: %lu: %s\n", line_number, s);
}
int main(int argc, char *argv[]) {
FILE *input = stdin;
int j = 0;
while (j != -1) {
j = getopt(argc, argv, "o:");
switch (j) {
case 'o':
input = fopen(optarg, "r");
if (input == NULL) {
perror(argv[0]);
return -1;
}
break;
default:
break;
}
}
yyin = input;
yyparse();
}
|
