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Reuse the saved_scope structures allocated by push_to_top_level

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gcc/cp/ChangeLog:

	* name-lookup.c (free_saved_scope): New free list of saved_scope
	structures.
	(push_to_top_level): Attempt to reuse a saved_scope struct
	from free_saved_scope instead of allocating a new one each time.
	(pop_from_top_level_1): Chain the now-unused saved_scope structure
	onto free_saved_scope.

From-SVN: r235351
This commit is contained in:
Patrick Palka 2016-04-21 21:55:35 +00:00
parent 617d8e43f9
commit 5c71225085
2 changed files with 33 additions and 1 deletions
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9
gcc/cp/ChangeLog
View File

@ -1,3 +1,12 @@
2016-04-21 Patrick Palka <ppalka@gcc.gnu.org>
* name-lookup.c (free_saved_scope): New free list of saved_scope
structures.
(push_to_top_level): Attempt to reuse a saved_scope struct
from free_saved_scope instead of allocating a new one each time.
(pop_from_top_level_1): Chain the now-unused saved_scope structure
onto free_saved_scope.
2016-04-21 Paolo Carlini <paolo.carlini@oracle.com>
PR c++/70540

25
gcc/cp/name-lookup.c
View File

@ -6135,6 +6135,10 @@ store_class_bindings (vec<cp_class_binding, va_gc> *names,
timevar_cond_stop (TV_NAME_LOOKUP, subtime);
}
/* A chain of saved_scope structures awaiting reuse. */
static GTY((deletable)) struct saved_scope *free_saved_scope;
void
push_to_top_level (void)
{
@ -6145,7 +6149,21 @@ push_to_top_level (void)
bool need_pop;
bool subtime = timevar_cond_start (TV_NAME_LOOKUP);
s = ggc_cleared_alloc<saved_scope> ();
/* Reuse or create a new structure for this saved scope. */
if (free_saved_scope != NULL)
{
s = free_saved_scope;
free_saved_scope = s->prev;
vec<cxx_saved_binding, va_gc> *old_bindings = s->old_bindings;
memset (s, 0, sizeof (*s));
/* Also reuse the structure's old_bindings vector. */
vec_safe_truncate (old_bindings, 0);
s->old_bindings = old_bindings;
}
else
s = ggc_cleared_alloc<saved_scope> ();
b = scope_chain ? current_binding_level : 0;
@ -6238,6 +6256,11 @@ pop_from_top_level_1 (void)
current_function_decl = s->function_decl;
cp_unevaluated_operand = s->unevaluated_operand;
c_inhibit_evaluation_warnings = s->inhibit_evaluation_warnings;
/* Make this saved_scope structure available for reuse by
push_to_top_level. */
s->prev = free_saved_scope;
free_saved_scope = s;
}
/* Wrapper for pop_from_top_level_1. */