Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
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#include "cgroup.h"
16
17int perf_bpf_filter_lex(void);
18
19/* To indicate if the current term needs a pathname or not */
20int perf_bpf_filter_needs_path;
21
22static void perf_bpf_filter_error(struct list_head *expr __maybe_unused,
23 char const *msg)
24{
25 printf("perf_bpf_filter: %s\n", msg);
26}
27
28%}
29
30%union
31{
32 unsigned long num;
33 char *path;
34 struct {
35 enum perf_bpf_filter_term term;
36 int part;
37 } sample;
38 enum perf_bpf_filter_op op;
39 struct perf_bpf_filter_expr *expr;
40}
41
42%token BFT_SAMPLE BFT_SAMPLE_PATH BFT_OP BFT_ERROR BFT_NUM BFT_LOGICAL_OR BFT_PATH
43%type <expr> filter_term filter_expr
44%destructor { free ($$); } <expr>
45%type <sample> BFT_SAMPLE BFT_SAMPLE_PATH
46%type <op> BFT_OP
47%type <num> BFT_NUM
48%type <path> BFT_PATH
49
50%%
51
52filter:
53filter ',' filter_term
54{
55 list_add_tail(&$3->list, expr_head);
56}
57|
58filter_term
59{
60 list_add_tail(&$1->list, expr_head);
61}
62
63filter_term:
64filter_term BFT_LOGICAL_OR filter_expr
65{
66 struct perf_bpf_filter_expr *expr;
67
68 if ($1->op == PBF_OP_GROUP_BEGIN) {
69 expr = $1;
70 } else {
71 expr = perf_bpf_filter_expr__new(PBF_TERM_NONE, /*part=*/0,
72 PBF_OP_GROUP_BEGIN, /*val=*/1);
73 list_add_tail(&$1->list, &expr->groups);
74 }
75 expr->val++;
76 list_add_tail(&$3->list, &expr->groups);
77 $$ = expr;
78}
79|
80filter_expr
81{
82 $$ = $1;
83}
84
85filter_expr:
86BFT_SAMPLE BFT_OP BFT_NUM
87{
88 $$ = perf_bpf_filter_expr__new($1.term, $1.part, $2, $3);
89}
90|
91BFT_SAMPLE_PATH BFT_OP BFT_PATH
92{
93 struct cgroup *cgrp;
94 unsigned long cgroup_id = 0;
95
96 if ($2 != PBF_OP_EQ && $2 != PBF_OP_NEQ) {
97 printf("perf_bpf_filter: cgroup accepts '==' or '!=' only\n");
98 YYERROR;
99 }
100
101 cgrp = cgroup__new($3, /*do_open=*/false);
102 if (cgrp && read_cgroup_id(cgrp) == 0)
103 cgroup_id = cgrp->id;
104
105 $$ = perf_bpf_filter_expr__new($1.term, $1.part, $2, cgroup_id);
106 cgroup__put(cgrp);
107}
108
109%%