xref: /kernel/linux/linux-6.6/tools/perf/util/expr.l (revision 62306a36) 
1%option prefix="expr_"
2%option reentrant
3%option bison-bridge
4
5%{
6#include <linux/compiler.h>
7#include "expr.h"
8#include "expr-bison.h"
9#include <math.h>
10
11char *expr_get_text(yyscan_t yyscanner);
12YYSTYPE *expr_get_lval(yyscan_t yyscanner);
13
14static double __value(YYSTYPE *yylval, char *str, int token)
15{
16	double num;
17
18	errno = 0;
19	num = strtod(str, NULL);
20	if (errno)
21		return EXPR_ERROR;
22
23	yylval->num = num;
24	return token;
25}
26
27static int value(yyscan_t scanner)
28{
29	YYSTYPE *yylval = expr_get_lval(scanner);
30	char *text = expr_get_text(scanner);
31
32	return __value(yylval, text, NUMBER);
33}
34
35/*
36 * Allow @ instead of / to be able to specify pmu/event/ without
37 * conflicts with normal division.
38 */
39static char *normalize(char *str, int runtime)
40{
41	char *ret = str;
42	char *dst = str;
43
44	while (*str) {
45		if (*str == '\\') {
46			*dst++ = *++str;
47			if (!*str)
48				break;
49		}
50		else if (*str == '?') {
51			char *paramval;
52			int i = 0;
53			int size = asprintf(&paramval, "%d", runtime);
54
55			if (size < 0)
56				*dst++ = '0';
57			else {
58				while (i < size)
59					*dst++ = paramval[i++];
60				free(paramval);
61			}
62		}
63		else
64			*dst++ = *str;
65		str++;
66	}
67
68	*dst = 0x0;
69	return ret;
70}
71
72static int str(yyscan_t scanner, int token, int runtime)
73{
74	YYSTYPE *yylval = expr_get_lval(scanner);
75	char *text = expr_get_text(scanner);
76
77	yylval->str = normalize(strdup(text), runtime);
78	if (!yylval->str)
79		return EXPR_ERROR;
80
81	yylval->str = normalize(yylval->str, runtime);
82	return token;
83}
84
85static int literal(yyscan_t scanner, const struct expr_scanner_ctx *sctx)
86{
87	YYSTYPE *yylval = expr_get_lval(scanner);
88
89	yylval->num = expr__get_literal(expr_get_text(scanner), sctx);
90	if (isnan(yylval->num)) {
91		if (!sctx->is_test)
92			return EXPR_ERROR;
93		yylval->num = 1;
94	}
95	return LITERAL;
96}
97%}
98
99number		([0-9]+\.?[0-9]*|[0-9]*\.?[0-9]+)(e-?[0-9]+)?
100
101sch		[-,=]
102spec		\\{sch}
103sym		[0-9a-zA-Z_\.:@?]+
104symbol		({spec}|{sym})+
105literal		#[0-9a-zA-Z_\.\-]+
106
107%%
108	struct expr_scanner_ctx *sctx = expr_get_extra(yyscanner);
109
110d_ratio		{ return D_RATIO; }
111max		{ return MAX; }
112min		{ return MIN; }
113if		{ return IF; }
114else		{ return ELSE; }
115source_count	{ return SOURCE_COUNT; }
116has_event	{ return HAS_EVENT; }
117strcmp_cpuid_str	{ return STRCMP_CPUID_STR; }
118{literal}	{ return literal(yyscanner, sctx); }
119{number}	{ return value(yyscanner); }
120{symbol}	{ return str(yyscanner, ID, sctx->runtime); }
121"|"		{ return '|'; }
122"^"		{ return '^'; }
123"&"		{ return '&'; }
124"<"		{ return '<'; }
125">"		{ return '>'; }
126"-"		{ return '-'; }
127"+"		{ return '+'; }
128"*"		{ return '*'; }
129"/"		{ return '/'; }
130"%"		{ return '%'; }
131"("		{ return '('; }
132")"		{ return ')'; }
133","		{ return ','; }
134.		{ }
135%%
136
137int expr_wrap(void *scanner __maybe_unused)
138{
139	return 1;
140}
141