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