tools/perf/util/expr.y

   1 /* Simple expression parser */
   2 %{
   3 #define YYDEBUG 1
   4 #include <stdio.h>
   5 #include "util.h"
   6 #include "util/debug.h"
   7 #include <stdlib.h> // strtod()
   8 #define IN_EXPR_Y 1
   9 #include "expr.h"
  10 #include "smt.h"
  11 #include <string.h>
  12
  13 static double d_ratio(double val0, double val1)
  14 {
  15         if (val1 == 0) {
  16                 return 0;
  17         }
  18         return  val0 / val1;
  19 }
  20
  21 %}
  22
  23 %define api.pure full
  24
  25 %parse-param { double *final_val }
  26 %parse-param { struct expr_parse_ctx *ctx }
  27 %parse-param {void *scanner}
  28 %lex-param {void* scanner}
  29
  30 %union {
  31         double   num;
  32         char    *str;
  33 }
  34
  35 %token EXPR_PARSE EXPR_OTHER EXPR_ERROR
  36 %token <num> NUMBER
  37 %token <str> ID
  38 %destructor { free ($$); } <str>
  39 %token MIN MAX IF ELSE SMT_ON D_RATIO
  40 %left MIN MAX IF
  41 %left '|'
  42 %left '^'
  43 %left '&'
  44 %left '<' '>'
  45 %left '-' '+'
  46 %left '*' '/' '%'
  47 %left NEG NOT
  48 %type <num> expr if_expr
  49
  50 %{
  51 static void expr_error(double *final_val __maybe_unused,
  52                        struct expr_parse_ctx *ctx __maybe_unused,
  53                        void *scanner,
  54                        const char *s)
  55 {
  56         pr_debug("%s\n", s);
  57 }
  58
  59 %}
  60 %%
  61
  62 start:
  63 EXPR_PARSE all_expr
  64 |
  65 EXPR_OTHER all_other
  66
  67 all_other: all_other other
  68 |
  69
  70 other: ID
  71 {
  72         expr__add_id(ctx, $1);
  73 }
  74 |
  75 MIN | MAX | IF | ELSE | SMT_ON | NUMBER | '|' | '^' | '&' | '-' | '+' | '*' | '/' | '%' | '(' | ')' | ','
  76 |
  77 '<' | '>' | D_RATIO
  78
  79 all_expr: if_expr                       { *final_val = $1; }
  80         ;
  81
  82 if_expr:
  83         expr IF expr ELSE expr { $$ = $3 ? $1 : $5; }
  84         | expr
  85         ;
  86
  87 expr:     NUMBER
  88         | ID                    {
  89                                         struct expr_id_data *data;
  90
  91                                         if (expr__resolve_id(ctx, $1, &data)) {
  92                                                 free($1);
  93                                                 YYABORT;
  94                                         }
  95
  96                                         $$ = data->val;
  97                                         free($1);
  98                                 }
  99         | expr '|' expr         { $$ = (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         { $$ = $1 * $3; }
 107         | expr '/' expr         { if ($3 == 0) {
 108                                         pr_debug("division by zero\n");
 109                                         YYABORT;
 110                                   }
 111                                   $$ = $1 / $3;
 112                                 }
 113         | expr '%' expr         { if ((long)$3 == 0) {
 114                                         pr_debug("division by zero\n");
 115                                         YYABORT;
 116                                   }
 117                                   $$ = (long)$1 % (long)$3;
 118                                 }
 119         | '-' expr %prec NEG    { $$ = -$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); }
 125         ;
 126
 127 %%