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2024-05-10 37f49e37ab4cb5d0bc4c60eb5c6d4dd57db767bb

 kernel/tools/perf/util/expr.y
..
..
@@ -1,65 +1,80 @@
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 /* 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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-#define MAXIDLEN 256
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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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 %}
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 %define api.pure full
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 %parse-param { double *final_val }
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-%parse-param { struct parse_ctx *ctx }
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-%parse-param { const char **pp }
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-%lex-param { const char **pp }
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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 id[MAXIDLEN+1];
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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 <id> ID
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-%token MIN MAX IF ELSE SMT_ON
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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 int expr__lex(YYSTYPE *res, const char **pp);
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-
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-static void expr__error(double *final_val __maybe_unused,
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-		       struct parse_ctx *ctx __maybe_unused,
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-		       const char **pp __maybe_unused,
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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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-static int lookup_id(struct parse_ctx *ctx, char *id, double *val)
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-{
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-	int i;
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-
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-	for (i = 0; i < ctx->num_ids; i++) {
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-		if (!strcasecmp(ctx->ids[i].name, id)) {
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-			*val = ctx->ids[i].val;
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-			return 0;
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-		}
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-	}
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-	return -1;
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-}
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-
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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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+|
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+EXPR_OTHER all_other
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+
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+all_other: all_other other
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+|
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+
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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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+|
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+MIN | MAX | IF | ELSE | SMT_ON | NUMBER | '|' | '^' | '&' | '-' | '+' | '*' | '/' | '%' | '(' | ')' | ','
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+|
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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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@@ -70,167 +85,43 @@
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 	;
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 expr:	  NUMBER
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-	| ID			{ if (lookup_id(ctx, $1, &$$) < 0) {
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-					pr_debug("%s not found\n", $1);
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-					YYABORT;
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-				  }
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+	| ID			{
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+					struct expr_id_data *data;
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+
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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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+
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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		{ $$ = $1 * $3; }
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-	| expr '/' expr		{ if ($3 == 0) YYABORT; $$ = $1 / $3; }
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-	| expr '%' expr		{ if ((long)$3 == 0) YYABORT; $$ = (long)$1 % (long)$3; }
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+	| expr '/' expr		{ if ($3 == 0) {
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+					pr_debug("division by zero\n");
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+					YYABORT;
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+				  }
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+				  $$ = $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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-
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-static int expr__symbol(YYSTYPE *res, const char *p, const char **pp)
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-{
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-	char *dst = res->id;
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-	const char *s = p;
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-
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-	if (*p == '#')
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-		*dst++ = *p++;
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-
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-	while (isalnum(*p) || *p == '_' || *p == '.' || *p == ':' || *p == '@' || *p == '\\') {
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-		if (p - s >= MAXIDLEN)
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-			return -1;
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-		/*
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-		 * Allow @ instead of / to be able to specify pmu/event/ without
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-		 * conflicts with normal division.
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-		 */
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-		if (*p == '@')
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-			*dst++ = '/';
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-		else if (*p == '\\')
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-			*dst++ = *++p;
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-		else
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-			*dst++ = *p;
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-		p++;
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-	}
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-	*dst = 0;
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-	*pp = p;
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-	dst = res->id;
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-	switch (dst[0]) {
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-	case 'm':
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-		if (!strcmp(dst, "min"))
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-			return MIN;
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-		if (!strcmp(dst, "max"))
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-			return MAX;
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-		break;
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-	case 'i':
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-		if (!strcmp(dst, "if"))
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-			return IF;
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-		break;
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-	case 'e':
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-		if (!strcmp(dst, "else"))
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-			return ELSE;
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-		break;
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-	case '#':
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-		if (!strcasecmp(dst, "#smt_on"))
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-			return SMT_ON;
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-		break;
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-	}
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-	return ID;
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-}
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-
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-static int expr__lex(YYSTYPE *res, const char **pp)
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-{
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-	int tok;
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-	const char *s;
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-	const char *p = *pp;
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-
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-	while (isspace(*p))
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-		p++;
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-	s = p;
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-	switch (*p++) {
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-	case '#':
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-	case 'a' ... 'z':
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-	case 'A' ... 'Z':
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-		return expr__symbol(res, p - 1, pp);
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-	case '0' ... '9': case '.':
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-		res->num = strtod(s, (char **)&p);
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-		tok = NUMBER;
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-		break;
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-	default:
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-		tok = *s;
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-		break;
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-	}
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-	*pp = p;
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-	return tok;
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-}
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-
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-/* Caller must make sure id is allocated */
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-void expr__add_id(struct parse_ctx *ctx, const char *name, double val)
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-{
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-	int idx;
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-	assert(ctx->num_ids < MAX_PARSE_ID);
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-	idx = ctx->num_ids++;
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-	ctx->ids[idx].name = name;
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-	ctx->ids[idx].val = val;
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-}
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-
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-void expr__ctx_init(struct parse_ctx *ctx)
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-{
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-	ctx->num_ids = 0;
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-}
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-
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-static bool already_seen(const char *val, const char *one, const char **other,
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-			 int num_other)
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-{
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-	int i;
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-
190
-	if (one && !strcasecmp(one, val))
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-		return true;
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-	for (i = 0; i < num_other; i++)
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-		if (!strcasecmp(other[i], val))
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-			return true;
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-	return false;
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-}
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-
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-int expr__find_other(const char *p, const char *one, const char ***other,
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-		     int *num_otherp)
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-{
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-	const char *orig = p;
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-	int err = -1;
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-	int num_other;
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-
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-	*other = malloc((EXPR_MAX_OTHER + 1) * sizeof(char *));
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-	if (!*other)
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-		return -1;
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-
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-	num_other = 0;
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-	for (;;) {
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-		YYSTYPE val;
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-		int tok = expr__lex(&val, &p);
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-		if (tok == 0) {
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-			err = 0;
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-			break;
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-		}
217
-		if (tok == ID && !already_seen(val.id, one, *other, num_other)) {
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-			if (num_other >= EXPR_MAX_OTHER - 1) {
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-				pr_debug("Too many extra events in %s\n", orig);
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-				break;
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-			}
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-			(*other)[num_other] = strdup(val.id);
223
-			if (!(*other)[num_other])
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-				return -1;
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-			num_other++;
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-		}
227
-	}
228
-	(*other)[num_other] = NULL;
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-	*num_otherp = num_other;
230
-	if (err) {
231
-		*num_otherp = 0;
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-		free(*other);
233
-		*other = NULL;
234
-	}
235
-	return err;
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-}