tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1%parse-param {struct list_head *expr_head}
2%define parse.error verbose
3
4%{
5
6#ifndef NDEBUG
7#define YYDEBUG 1
8#endif
9
10#include <stdio.h>
11#include <string.h>
12#include <linux/compiler.h>
13#include <linux/list.h>
14#include "bpf-filter.h"
15
16int perf_bpf_filter_lex(void);
17
18static void perf_bpf_filter_error(struct list_head *expr __maybe_unused,
19 char const *msg)
20{
21 printf("perf_bpf_filter: %s\n", msg);
22}
23
24%}
25
26%union
27{
28 unsigned long num;
29 struct {
30 unsigned long type;
31 int part;
32 } sample;
33 enum perf_bpf_filter_op op;
34 struct perf_bpf_filter_expr *expr;
35}
36
37%token BFT_SAMPLE BFT_OP BFT_ERROR BFT_NUM BFT_LOGICAL_OR
38%type <expr> filter_term filter_expr
39%destructor { free ($$); } <expr>
40%type <sample> BFT_SAMPLE
41%type <op> BFT_OP
42%type <num> BFT_NUM
43
44%%
45
46filter:
47filter ',' filter_term
48{
49 list_add_tail(&$3->list, expr_head);
50}
51|
52filter_term
53{
54 list_add_tail(&$1->list, expr_head);
55}
56
57filter_term:
58filter_term BFT_LOGICAL_OR filter_expr
59{
60 struct perf_bpf_filter_expr *expr;
61
62 if ($1->op == PBF_OP_GROUP_BEGIN) {
63 expr = $1;
64 } else {
65 expr = perf_bpf_filter_expr__new(0, 0, PBF_OP_GROUP_BEGIN, 1);
66 list_add_tail(&$1->list, &expr->groups);
67 }
68 expr->val++;
69 list_add_tail(&$3->list, &expr->groups);
70 $$ = expr;
71}
72|
73filter_expr
74{
75 $$ = $1;
76}
77
78filter_expr:
79BFT_SAMPLE BFT_OP BFT_NUM
80{
81 $$ = perf_bpf_filter_expr__new($1.type, $1.part, $2, $3);
82}
83
84%%