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1%parse-param {struct list_head *expr_head}2%define parse.error verbose3 4%{5 6#ifndef NDEBUG7#define YYDEBUG 18#endif9 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%union31{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_PATH43%type <expr> filter_term filter_expr44%destructor { free ($$); } <expr>45%type <sample> BFT_SAMPLE BFT_SAMPLE_PATH46%type <op> BFT_OP47%type <num> BFT_NUM48%type <path> BFT_PATH49 50%%51 52filter:53filter ',' filter_term54{55 list_add_tail(&$3->list, expr_head);56}57|58filter_term59{60 list_add_tail(&$1->list, expr_head);61}62 63filter_term:64filter_term BFT_LOGICAL_OR filter_expr65{66 struct perf_bpf_filter_expr *expr;67 68 if ($1->op == PBF_OP_GROUP_BEGIN) {69 expr = $1;70 } else {71 expr = perf_bpf_filter_expr__new(PBF_TERM_NONE, /*part=*/0,72 PBF_OP_GROUP_BEGIN, /*val=*/1);73 list_add_tail(&$1->list, &expr->groups);74 }75 expr->val++;76 list_add_tail(&$3->list, &expr->groups);77 $$ = expr;78}79|80filter_expr81{82 $$ = $1;83}84 85filter_expr:86BFT_SAMPLE BFT_OP BFT_NUM87{88 $$ = perf_bpf_filter_expr__new($1.term, $1.part, $2, $3);89}90|91BFT_SAMPLE_PATH BFT_OP BFT_PATH92{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%%110