Re: [PATCH v5 06/10] perf tools: add destructors for parse event terms

Jiri Olsa
2019-11-06T14:24:37Z

On Wed, Oct 30, 2019 at 03:34:44PM -0700, Ian Rogers wrote:
> If parsing fails then destructors are ran to clean the up the stack.
> Rename the head union member to make the term and evlist use cases more
> distinct, this simplifies matching the correct destructor.
>
> Signed-off-by: Ian Rogers <irogers@google.com>

Acked-by: Jiri Olsa <jolsa@kernel.org>

thanks,
jirka

> ---
> tools/perf/util/parse-events.y | 69 +++++++++++++++++++++++-----------
> 1 file changed, 48 insertions(+), 21 deletions(-)
>
> diff --git a/tools/perf/util/parse-events.y b/tools/perf/util/parse-events.y
> index 545ab7cefc20..035edfa8d42e 100644
> --- a/tools/perf/util/parse-events.y
> +++ b/tools/perf/util/parse-events.y
> @@ -12,6 +12,7 @@
> #include <stdio.h>
> #include <linux/compiler.h>
> #include <linux/types.h>
> +#include <linux/zalloc.h>
> #include "pmu.h"
> #include "evsel.h"
> #include "parse-events.h"
> @@ -37,6 +38,25 @@ static struct list_head* alloc_list()
> return list;
> }
>
> +static void free_list_evsel(struct list_head* list_evsel)
> +{
> + struct evsel *evsel, *tmp;
> +
> + list_for_each_entry_safe(evsel, tmp, list_evsel, core.node) {
> + list_del_init(&evsel->core.node);
> + perf_evsel__delete(evsel);
> + }
> + free(list_evsel);
> +}
> +
> +static void free_term(struct parse_events_term *term)
> +{
> + if (term->type_val == PARSE_EVENTS__TERM_TYPE_STR)
> + free(term->val.str);
> + zfree(&term->array.ranges);
> + free(term);
> +}
> +
> static void inc_group_count(struct list_head *list,
> struct parse_events_state *parse_state)
> {
> @@ -66,6 +86,7 @@ static void inc_group_count(struct list_head *list,
> %type <num> PE_VALUE_SYM_TOOL
> %type <num> PE_RAW
> %type <num> PE_TERM
> +%type <num> value_sym
> %type <str> PE_NAME
> %type <str> PE_BPF_OBJECT
> %type <str> PE_BPF_SOURCE
> @@ -76,37 +97,43 @@ static void inc_group_count(struct list_head *list,
> %type <str> PE_EVENT_NAME
> %type <str> PE_PMU_EVENT_PRE PE_PMU_EVENT_SUF PE_KERNEL_PMU_EVENT
> %type <str> PE_DRV_CFG_TERM
> -%type <num> value_sym
> -%type event_config
> -%type opt_event_config
> -%type opt_pmu_config
> +%destructor { free ($$); } <str>
> %type <term> event_term
> -%type event_pmu
> -%type event_legacy_symbol
> -%type event_legacy_cache
> -%type event_legacy_mem
> -%type event_legacy_tracepoint
> +%destructor { free_term ($$); } <term>
> +%type <list_terms> event_config
> +%type <list_terms> opt_event_config
> +%type <list_terms> opt_pmu_config
> +%destructor { parse_events_terms__delete ($$); } <list_terms>
> +%type <list_evsel> event_pmu
> +%type <list_evsel> event_legacy_symbol
> +%type <list_evsel> event_legacy_cache
> +%type <list_evsel> event_legacy_mem
> +%type <list_evsel> event_legacy_tracepoint
> +%type <list_evsel> event_legacy_numeric
> +%type <list_evsel> event_legacy_raw
> +%type <list_evsel> event_bpf_file
> +%type <list_evsel> event_def
> +%type <list_evsel> event_mod
> +%type <list_evsel> event_name
> +%type <list_evsel> event
> +%type <list_evsel> events
> +%type <list_evsel> group_def
> +%type <list_evsel> group
> +%type <list_evsel> groups
> +%destructor { free_list_evsel ($$); } <list_evsel>
> %type <tracepoint_name> tracepoint_name
> -%type event_legacy_numeric
> -%type event_legacy_raw
> -%type event_bpf_file
> -%type event_def
> -%type event_mod
> -%type event_name
> -%type event
> -%type events
> -%type group_def
> -%type group
> -%type groups
> +%destructor { free ($$.sys); free ($$.event); } <tracepoint_name>
> %type <array> array
> %type <array> array_term
> %type <array> array_terms
> +%destructor { free ($$.ranges); } <array>
>
> %union
> {
> char *str;
> u64 num;
> - struct list_head *head;
> + struct list_head *list_evsel;
> + struct list_head *list_terms;
> struct parse_events_term *term;
> struct tracepoint_name {
> char *sys;
> --
> 2.24.0.rc1.363.gb1bccd3e3d-goog
>