Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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(¶mval, "%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; }
117{literal} { return literal(yyscanner, sctx); }
118{number} { return value(yyscanner); }
119{symbol} { return str(yyscanner, ID, sctx->runtime); }
120"|" { return '|'; }
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. { }
134%%
135
136int expr_wrap(void *scanner __maybe_unused)
137{
138 return 1;
139}