[PATCH v4 6/9] perf tools: add destructors for parse event terms

Ian Rogers
2019-10-25T18:09:20Z

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>
---
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.rc0.303.g954a862665-goog