1 /* Simple expression parser */
6 #include "util/debug.h"
7 #include <stdlib.h> // strtod()
13 static double d_ratio(double val0, double val1)
25 %parse-param { double *final_val }
26 %parse-param { struct expr_parse_ctx *ctx }
27 %parse-param {void *scanner}
28 %lex-param {void* scanner}
35 %token EXPR_PARSE EXPR_OTHER EXPR_ERROR
38 %destructor { free ($$); } <str>
39 %token MIN MAX IF ELSE SMT_ON D_RATIO
48 %type <num> expr if_expr
51 static void expr_error(double *final_val __maybe_unused,
52 struct expr_parse_ctx *ctx __maybe_unused,
67 all_other: all_other other
72 expr__add_id(ctx, $1);
75 MIN | MAX | IF | ELSE | SMT_ON | NUMBER | '|' | '^' | '&' | '-' | '+' | '*' | '/' | '%' | '(' | ')' | ','
79 all_expr: if_expr { *final_val = $1; }
83 expr IF expr ELSE expr { $$ = $3 ? $1 : $5; }
89 struct expr_id_data *data;
91 if (expr__resolve_id(ctx, $1, &data)) {
96 $$ = expr_id_data__value(data);
99 | expr '|' expr { $$ = (long)$1 | (long)$3; }
100 | expr '&' expr { $$ = (long)$1 & (long)$3; }
101 | expr '^' expr { $$ = (long)$1 ^ (long)$3; }
102 | expr '<' expr { $$ = $1 < $3; }
103 | expr '>' expr { $$ = $1 > $3; }
104 | expr '+' expr { $$ = $1 + $3; }
105 | expr '-' expr { $$ = $1 - $3; }
106 | expr '*' expr { $$ = $1 * $3; }
107 | expr '/' expr { if ($3 == 0) {
108 pr_debug("division by zero\n");
113 | expr '%' expr { if ((long)$3 == 0) {
114 pr_debug("division by zero\n");
117 $$ = (long)$1 % (long)$3;
119 | '-' expr %prec NEG { $$ = -$2; }
120 | '(' if_expr ')' { $$ = $2; }
121 | MIN '(' expr ',' expr ')' { $$ = $3 < $5 ? $3 : $5; }
122 | MAX '(' expr ',' expr ')' { $$ = $3 > $5 ? $3 : $5; }
123 | SMT_ON { $$ = smt_on() > 0; }
124 | D_RATIO '(' expr ',' expr ')' { $$ = d_ratio($3,$5); }