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