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Fix leaks when pruning inferiors. 

Valgrind detects various inferior related leaks, such as:
  ==31877== 5,530 (56 direct, 5,474 indirect) bytes in 1 blocks are definitely lost in loss record 7,131 of 7,355
  ==31877==    at 0x4C2E18C: calloc (vg_replace_malloc.c:760)
  ==31877==    by 0x23E580: xcalloc (alloc.c:100)
  ==31877==    by 0x4794A9: xcnewvec<void*> (poison.h:158)
  ==31877==    by 0x4794A9: registry_alloc_data(registry_data_registry*, registry_fields*) (registry.c:51)
  ==31877==    by 0x3A537C: inferior_alloc_data (inferior.c:43)
  ==31877==    by 0x3A537C: inferior::inferior(int) (inferior.c:92)
  ==31877==    by 0x3A5426: add_inferior_silent(int) (inferior.c:98)
  ==31877==    by 0x3A5530: add_inferior(int) (inferior.c:122)
  ...

Origin of the leaks is in prune_inferiors: prune_inferiors is first removing
the inferior to prune from the inferior list, then calls delete_inferior.
But delete_inferior will only really destroy the inferior when it finds
it into the inferior list.
As delete_inferior is removing the inferior to delete from the inferior list,
ensure prune_inferiors only calls delete_inferior, without touching the
inferior list.

gdb/ChangeLog
2019-12-05  Philippe Waroquiers  <philippe.waroquiers@skynet.be>
	* inferior.c (prune_inferiors):  Only call delete_inferior.
	Do not modify the inferior list.
This commit is contained in:
Philippe Waroquiers 2019-12-01 15:40:17 +01:00
parent bce7c9d6fb
commit 908641f530
2 changed files with 8 additions and 6 deletions
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4
gdb/ChangeLog
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@ -1,3 +1,7 @@
2019-12-05 Philippe Waroquiers <philippe.waroquiers@skynet.be>
* inferior.c (prune_inferiors): Only call delete_inferior,
Do not modify the inferior list.
2019-12-05 Simon Marchi <simon.marchi@polymtl.ca>
* c-exp.y: Update calls to lookup_typename,

10
gdb/inferior.c
View File

@ -370,24 +370,22 @@ have_live_inferiors (void)
void
prune_inferiors (void)
{
struct inferior *ss, **ss_link;
inferior *ss;
ss = inferior_list;
ss_link = &inferior_list;
while (ss)
{
if (!ss->deletable ()
|| !ss->removable
|| ss->pid != 0)
{
ss_link = &ss->next;
ss = *ss_link;
ss = ss->next;
continue;
}
*ss_link = ss->next;
inferior *ss_next = ss->next;
delete_inferior (ss);
ss = *ss_link;
ss = ss_next;
}
}