mirror of https://gitee.com/openkylin/linux.git
294 lines
6.4 KiB
C
294 lines
6.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <stdbool.h>
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#include <assert.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <string.h>
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#include "metricgroup.h"
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#include "debug.h"
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#include "expr.h"
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#include "expr-bison.h"
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#include "expr-flex.h"
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#include <linux/kernel.h>
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#include <linux/zalloc.h>
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#include <ctype.h>
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#ifdef PARSER_DEBUG
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extern int expr_debug;
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#endif
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struct expr_id_data {
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union {
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double val;
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struct {
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double val;
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const char *metric_name;
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const char *metric_expr;
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} ref;
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struct expr_id *parent;
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};
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enum {
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/* Holding a double value. */
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EXPR_ID_DATA__VALUE,
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/* Reference to another metric. */
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EXPR_ID_DATA__REF,
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/* A reference but the value has been computed. */
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EXPR_ID_DATA__REF_VALUE,
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/* A parent is remembered for the recursion check. */
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EXPR_ID_DATA__PARENT,
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} kind;
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};
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static size_t key_hash(const void *key, void *ctx __maybe_unused)
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{
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const char *str = (const char *)key;
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size_t hash = 0;
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while (*str != '\0') {
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hash *= 31;
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hash += *str;
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str++;
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}
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return hash;
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}
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static bool key_equal(const void *key1, const void *key2,
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void *ctx __maybe_unused)
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{
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return !strcmp((const char *)key1, (const char *)key2);
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}
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/* Caller must make sure id is allocated */
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int expr__add_id(struct expr_parse_ctx *ctx, const char *id)
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{
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struct expr_id_data *data_ptr = NULL, *old_data = NULL;
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char *old_key = NULL;
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int ret;
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data_ptr = malloc(sizeof(*data_ptr));
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if (!data_ptr)
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return -ENOMEM;
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data_ptr->parent = ctx->parent;
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data_ptr->kind = EXPR_ID_DATA__PARENT;
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ret = hashmap__set(&ctx->ids, id, data_ptr,
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(const void **)&old_key, (void **)&old_data);
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if (ret)
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free(data_ptr);
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free(old_key);
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free(old_data);
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return ret;
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}
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/* Caller must make sure id is allocated */
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int expr__add_id_val(struct expr_parse_ctx *ctx, const char *id, double val)
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{
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struct expr_id_data *data_ptr = NULL, *old_data = NULL;
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char *old_key = NULL;
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int ret;
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data_ptr = malloc(sizeof(*data_ptr));
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if (!data_ptr)
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return -ENOMEM;
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data_ptr->val = val;
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data_ptr->kind = EXPR_ID_DATA__VALUE;
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ret = hashmap__set(&ctx->ids, id, data_ptr,
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(const void **)&old_key, (void **)&old_data);
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if (ret)
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free(data_ptr);
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free(old_key);
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free(old_data);
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return ret;
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}
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int expr__add_ref(struct expr_parse_ctx *ctx, struct metric_ref *ref)
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{
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struct expr_id_data *data_ptr = NULL, *old_data = NULL;
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char *old_key = NULL;
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char *name, *p;
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int ret;
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data_ptr = zalloc(sizeof(*data_ptr));
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if (!data_ptr)
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return -ENOMEM;
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name = strdup(ref->metric_name);
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if (!name) {
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free(data_ptr);
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return -ENOMEM;
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}
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/*
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* The jevents tool converts all metric expressions
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* to lowercase, including metric references, hence
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* we need to add lowercase name for metric, so it's
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* properly found.
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*/
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for (p = name; *p; p++)
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*p = tolower(*p);
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/*
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* Intentionally passing just const char pointers,
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* originally from 'struct pmu_event' object.
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* We don't need to change them, so there's no
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* need to create our own copy.
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*/
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data_ptr->ref.metric_name = ref->metric_name;
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data_ptr->ref.metric_expr = ref->metric_expr;
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data_ptr->kind = EXPR_ID_DATA__REF;
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ret = hashmap__set(&ctx->ids, name, data_ptr,
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(const void **)&old_key, (void **)&old_data);
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if (ret)
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free(data_ptr);
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pr_debug2("adding ref metric %s: %s\n",
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ref->metric_name, ref->metric_expr);
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free(old_key);
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free(old_data);
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return ret;
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}
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int expr__get_id(struct expr_parse_ctx *ctx, const char *id,
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struct expr_id_data **data)
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{
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return hashmap__find(&ctx->ids, id, (void **)data) ? 0 : -1;
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}
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int expr__resolve_id(struct expr_parse_ctx *ctx, const char *id,
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struct expr_id_data **datap)
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{
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struct expr_id_data *data;
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if (expr__get_id(ctx, id, datap) || !*datap) {
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pr_debug("%s not found\n", id);
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return -1;
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}
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data = *datap;
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switch (data->kind) {
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case EXPR_ID_DATA__VALUE:
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pr_debug2("lookup(%s): val %f\n", id, data->val);
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break;
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case EXPR_ID_DATA__PARENT:
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pr_debug2("lookup(%s): parent %s\n", id, data->parent->id);
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break;
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case EXPR_ID_DATA__REF:
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pr_debug2("lookup(%s): ref metric name %s\n", id,
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data->ref.metric_name);
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pr_debug("processing metric: %s ENTRY\n", id);
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data->kind = EXPR_ID_DATA__REF_VALUE;
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if (expr__parse(&data->ref.val, ctx, data->ref.metric_expr, 1)) {
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pr_debug("%s failed to count\n", id);
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return -1;
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}
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pr_debug("processing metric: %s EXIT: %f\n", id, data->val);
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break;
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case EXPR_ID_DATA__REF_VALUE:
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pr_debug2("lookup(%s): ref val %f metric name %s\n", id,
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data->ref.val, data->ref.metric_name);
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break;
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default:
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assert(0); /* Unreachable. */
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}
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return 0;
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}
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void expr__del_id(struct expr_parse_ctx *ctx, const char *id)
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{
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struct expr_id_data *old_val = NULL;
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char *old_key = NULL;
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hashmap__delete(&ctx->ids, id,
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(const void **)&old_key, (void **)&old_val);
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free(old_key);
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free(old_val);
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}
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void expr__ctx_init(struct expr_parse_ctx *ctx)
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{
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hashmap__init(&ctx->ids, key_hash, key_equal, NULL);
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}
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void expr__ctx_clear(struct expr_parse_ctx *ctx)
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{
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struct hashmap_entry *cur;
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size_t bkt;
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hashmap__for_each_entry((&ctx->ids), cur, bkt) {
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free((char *)cur->key);
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free(cur->value);
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}
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hashmap__clear(&ctx->ids);
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}
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static int
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__expr__parse(double *val, struct expr_parse_ctx *ctx, const char *expr,
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int start, int runtime)
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{
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struct expr_scanner_ctx scanner_ctx = {
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.start_token = start,
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.runtime = runtime,
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};
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YY_BUFFER_STATE buffer;
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void *scanner;
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int ret;
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pr_debug2("parsing metric: %s\n", expr);
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ret = expr_lex_init_extra(&scanner_ctx, &scanner);
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if (ret)
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return ret;
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buffer = expr__scan_string(expr, scanner);
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#ifdef PARSER_DEBUG
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expr_debug = 1;
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expr_set_debug(1, scanner);
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#endif
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ret = expr_parse(val, ctx, scanner);
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expr__flush_buffer(buffer, scanner);
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expr__delete_buffer(buffer, scanner);
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expr_lex_destroy(scanner);
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return ret;
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}
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int expr__parse(double *final_val, struct expr_parse_ctx *ctx,
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const char *expr, int runtime)
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{
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return __expr__parse(final_val, ctx, expr, EXPR_PARSE, runtime) ? -1 : 0;
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}
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int expr__find_other(const char *expr, const char *one,
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struct expr_parse_ctx *ctx, int runtime)
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{
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int ret = __expr__parse(NULL, ctx, expr, EXPR_OTHER, runtime);
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if (one)
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expr__del_id(ctx, one);
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return ret;
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}
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double expr_id_data__value(const struct expr_id_data *data)
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{
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if (data->kind == EXPR_ID_DATA__VALUE)
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return data->val;
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assert(data->kind == EXPR_ID_DATA__REF_VALUE);
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return data->ref.val;
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}
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struct expr_id *expr_id_data__parent(struct expr_id_data *data)
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{
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assert(data->kind == EXPR_ID_DATA__PARENT);
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return data->parent;
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}
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