mirror of
git://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs.git
synced 2026-11-08 10:31:43 +01:00
Jiri Olsa
acf71b05d1
Adding computation (expr__parse call) of referenced metric at the point when it needs to be resolved during the parent metric computation. Once the inner metric is computed, the result is stored and used if there's another usage of that metric. Signed-off-by: Jiri Olsa <[email protected]> Reviewed-by: Kajol Jain <[email protected]> Acked-by: Ian Rogers <[email protected]> Cc: Alexander Shishkin <[email protected]> Cc: Andi Kleen <[email protected]> Cc: John Garry <[email protected]> Cc: Michael Petlan <[email protected]> Cc: Namhyung Kim <[email protected]> Cc: Paul Clarke <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: Stephane Eranian <[email protected]> Link: http://lore.kernel.org/lkml/[email protected] Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>
128 lines
2.4 KiB
Plaintext
128 lines
2.4 KiB
Plaintext
/* Simple expression parser */
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%{
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#define YYDEBUG 1
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#include <stdio.h>
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#include "util.h"
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#include "util/debug.h"
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#include <stdlib.h> // strtod()
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#define IN_EXPR_Y 1
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#include "expr.h"
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#include "smt.h"
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#include <string.h>
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static double d_ratio(double val0, double val1)
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{
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if (val1 == 0) {
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return 0;
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}
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return val0 / val1;
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}
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%}
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%define api.pure full
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%parse-param { double *final_val }
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%parse-param { struct expr_parse_ctx *ctx }
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%parse-param {void *scanner}
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%lex-param {void* scanner}
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%union {
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double num;
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char *str;
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}
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%token EXPR_PARSE EXPR_OTHER EXPR_ERROR
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%token <num> NUMBER
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%token <str> ID
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%destructor { free ($$); } <str>
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%token MIN MAX IF ELSE SMT_ON D_RATIO
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%left MIN MAX IF
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%left '|'
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%left '^'
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%left '&'
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%left '<' '>'
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%left '-' '+'
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%left '*' '/' '%'
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%left NEG NOT
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%type <num> expr if_expr
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%{
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static void expr_error(double *final_val __maybe_unused,
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struct expr_parse_ctx *ctx __maybe_unused,
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void *scanner,
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const char *s)
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{
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pr_debug("%s\n", s);
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}
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%}
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%%
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start:
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EXPR_PARSE all_expr
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EXPR_OTHER all_other
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all_other: all_other other
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other: ID
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{
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expr__add_id(ctx, $1);
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}
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MIN | MAX | IF | ELSE | SMT_ON | NUMBER | '|' | '^' | '&' | '-' | '+' | '*' | '/' | '%' | '(' | ')' | ','
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'<' | '>' | D_RATIO
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all_expr: if_expr { *final_val = $1; }
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;
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if_expr:
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expr IF expr ELSE expr { $$ = $3 ? $1 : $5; }
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| expr
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;
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expr: NUMBER
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| ID {
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struct expr_id_data *data;
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if (expr__resolve_id(ctx, $1, &data)) {
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free($1);
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YYABORT;
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}
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$$ = data->val;
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free($1);
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}
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| expr '|' expr { $$ = (long)$1 | (long)$3; }
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| expr '&' expr { $$ = (long)$1 & (long)$3; }
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| expr '^' expr { $$ = (long)$1 ^ (long)$3; }
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| expr '<' expr { $$ = $1 < $3; }
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| expr '>' expr { $$ = $1 > $3; }
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| expr '+' expr { $$ = $1 + $3; }
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| expr '-' expr { $$ = $1 - $3; }
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| expr '*' expr { $$ = $1 * $3; }
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| expr '/' expr { if ($3 == 0) {
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pr_debug("division by zero\n");
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YYABORT;
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}
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$$ = $1 / $3;
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}
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| expr '%' expr { if ((long)$3 == 0) {
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pr_debug("division by zero\n");
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YYABORT;
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}
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$$ = (long)$1 % (long)$3;
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}
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| '-' expr %prec NEG { $$ = -$2; }
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| '(' if_expr ')' { $$ = $2; }
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| MIN '(' expr ',' expr ')' { $$ = $3 < $5 ? $3 : $5; }
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| MAX '(' expr ',' expr ')' { $$ = $3 > $5 ? $3 : $5; }
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| SMT_ON { $$ = smt_on() > 0; }
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| D_RATIO '(' expr ',' expr ')' { $$ = d_ratio($3,$5); }
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;
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%%
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