59 lines
1.4 KiB
Text
59 lines
1.4 KiB
Text
|
%code requires {
|
||
|
|
#include <types.h>
|
||
|
|
#include <stdio.h>
|
||
|
|
#include <stdlib.h>
|
||
|
|
extern int yylex(void);
|
||
|
|
}
|
||
|
|
%{
|
||
|
|
#include <types.h>
|
||
|
|
#include <stdio.h>
|
||
|
|
#include <stdlib.h>
|
||
|
|
void yyerror(word_t *result, const char *err) {
|
||
|
|
fprintf(stderr, "%s", err);
|
||
|
|
}
|
||
|
|
int pmem_read(int raddr);
|
||
|
|
%}
|
||
|
|
|
||
|
|
%token NUMBER HEX_NUMBER
|
||
|
|
%token REGISTER
|
||
|
|
%locations
|
||
|
|
%start input
|
||
|
|
%define api.value.type { word_t }
|
||
|
|
%parse-param { uint32_t *result }
|
||
|
|
%left '-' '+'
|
||
|
|
%left '*' '/'
|
||
|
|
|
||
|
|
%%
|
||
|
|
input
|
||
|
|
: expression { *result = $1; }
|
||
|
|
;
|
||
|
|
|
||
|
|
expression
|
||
|
|
: number { $$ = $1; }
|
||
|
|
| expression '>' '=' expression { $$ = ($1 >= $4); }
|
||
|
|
| expression '<' '=' expression { $$ = ($1 <= $4); }
|
||
|
|
| expression '=' '=' expression { $$ = ($1 == $4); }
|
||
|
|
| expression '!' '=' expression { $$ = ($1 == $4); }
|
||
|
|
| expression '>' expression { $$ = ($1 > $3); }
|
||
|
|
| expression '<' expression { $$ = ($1 < $3); }
|
||
|
|
| expression '+' expression { $$ = $1 + $3; }
|
||
|
|
| expression '-' expression { $$ = $1 - $3; }
|
||
|
|
| expression '*' expression { $$ = $1 * $3; }
|
||
|
|
| expression '/' expression {
|
||
|
|
if($3 == 0) {
|
||
|
|
fprintf(stderr, "Error: divide by zero at" FMT_WORD " / " FMT_WORD "\n", $1, $3);
|
||
|
|
YYABORT;
|
||
|
|
};
|
||
|
|
$$ = $1 / $3;
|
||
|
|
}
|
||
|
|
| '-' number { $$ = -$2; }
|
||
|
|
| '*' expression { $$ = pmem_read($2); }
|
||
|
|
| '(' expression ')' { $$ = $2; }
|
||
|
|
|
||
|
|
number
|
||
|
|
: REGISTER
|
||
|
|
| NUMBER
|
||
|
|
| HEX_NUMBER
|
||
|
|
|
||
|
|
%%
|