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|
/* xas_parse.y
* Parser description file for XAS, an assembler for XCPU.
*
*/
%{
#include "xas.h"
int yylex (YYSTYPE *lvalp, YYLTYPE *llocp);
%}
%locations
%pure-parser
%error-verbose
%union {
char reg;
uint32_t val;
char *id;
char character;
char *string;
}
%token <id> ID
%token <val> NUMBER
%token <val> BIT
%token <reg> REGISTER
%token <character> CHARACTER
%token <string> STRING
%token <id> FILENAME
%token NOP
%token JUMP
%token PUSH
%token POP
%token MEMOP
%token CPUOP
%token ASSIGN
%token ADD
%token SHIFT
%token AND
%token OR
%token NOT
%token MOVE
%token COMPARE
%token HALT
%token CONFIG
%token INCLUDE
%token DEFINE
%token LABEL
%token IMMED
/* %token MACRO */
/* %token ENDMACRO */
/* %token MACROREF */
%left '|'
%left '$'
%left '&'
%left '<' '>'
%left '-' '+'
%left '*' '/' '%'
%left NEG POS
%right '~'
%right '^'
%type <val> arg
%type <val> expr
%%
input: /* empty */
| input line
;
line: '\n'
| instruction
| directive
| error { yyclearin; yyerrok; }
/* | macroref */
;
instruction: NOP { ins_nop (); }
| JUMP arg { ins_jump ($2); }
| PUSH REGISTER { ins_push ($2); }
| POP REGISTER { ins_pop ($2); }
| MEMOP REGISTER { ins_memop ($2); }
| CPUOP arg ',' arg { ins_cpuop ($2, $4); }
| ASSIGN REGISTER ',' expr { ins_assign ($2, $4); }
| ADD REGISTER { ins_add ($2); }
| SHIFT REGISTER { ins_shift ($2); }
| AND REGISTER { ins_and ($2); }
| OR REGISTER { ins_or ($2); }
| NOT REGISTER { ins_not ($2); }
| MOVE REGISTER { ins_move ($2); }
| COMPARE REGISTER { ins_compare ($2); }
| HALT { ins_halt (); }
| CONFIG arg { ins_config ($2); }
;
directive: INCLUDE FILENAME { dir_include ($2); }
| DEFINE ID expr { dir_define ($2, $3); }
| LABEL ID { dir_label ($2); }
| IMMED STRING { dir_immed_string ($2); }
| IMMED expr { dir_immed_bytes ($2); }
/* | MACRO ID mparam { dir_begin_ignore (); } */
/* | ENDMACRO { dir_end_ignore (); } */
;
/* macroref: MACROREF mparam { expand_macro ($2); } */
/* ; */
arg: NUMBER { $$ = $1; }
| BIT { $$ = $1; }
| ID { $$ = resolve_identifier ($1); }
;
expr: NUMBER { $$ = $1; }
| BIT { $$ = $1; }
| ID { $$ = resolve_identifier ($1); }
| CHARACTER { $$ = (uint32_t)$1; }
| expr '|' expr { $$ = $1 | $3; }
| expr '$' expr { $$ = $1 ^ $3; }
| expr '&' expr { $$ = $1 & $3; }
| expr '<' expr { $$ = $1 << $3; }
| expr '>' expr { $$ = $1 >> $3; }
| expr '+' expr { $$ = $1 + $3; }
| expr '-' expr { $$ = $1 - $3; }
| expr '*' expr { $$ = $1 * $3; }
| expr '/' expr { $$ = $1 / $3; }
| expr '%' expr { $$ = $1 % $3; }
| '+' expr %prec POS { $$ = +$2; }
| '-' expr %prec NEG { $$ = -$2; }
| '~' expr { $$ = ~$2; }
| expr '^' expr { $$ = pow ($1, $3); }
| '(' expr ')' { $$ = $2; }
;
/* mparam: mparam ',' arg */
/* ; */
%%
|
