+2004-12-01 Jeff Law <law@redhat.com>
+
+ * tree.h (save_eptr, save_filt): Now file scoped statics.
+ (honor_protect_cleanup_actions): Only create save_eptr and
+ save_filt if they do not already exist.
+ (lower_eh_constructs): Wipe all knowledge of save_eptr and
+ save_filt before returning.
+
2004-12-02 Kazu Hirata <kazu@cs.umass.edu>
* tree-phinodes.c (remove_phi_arg_num): Fix a comment.
#include "langhooks.h"
#include "ggc.h"
+/* In some circumstances we have to save EH data around a nested
+ exception. The EXC_PTR_EXPR and FILTER_EXPR values are saved
+ into these _DECL nodes.
+
+ We lazily create this pair of _DECL nodes once per function rather
+ than creating a new pair of _DECLs each time we need to save the
+ EXEC_PTR and FILTER. This can save us literally thousands of _DECL
+ nodes when we have many inline destructors with an embedded try block.
+
+ This is safe as we know the lifetime of the values in these _DECL nodes.
+ Their lifetimes also ensure that globbing these uses into a single
+ pair of _DECL nodes requires no additional PHI_NODEs or SSA_NAMEs when
+ compared to having a pair of _DECL nodes per inline destructor with
+ an embedded try block. */
+static tree save_eptr, save_filt;
\f
/* Nonzero if we are using EH to handle cleanups. */
static int using_eh_for_cleanups_p = 0;
we never fallthru from this copy of the finally block. */
if (finally_may_fallthru)
{
- tree save_eptr, save_filt;
-
- save_eptr = create_tmp_var (ptr_type_node, "save_eptr");
- save_filt = create_tmp_var (integer_type_node, "save_filt");
+ /* If we have not created _DECLs for saving the EXC_PTR
+ and FILTER_EXPR, create them now. */
+ if (!save_eptr)
+ {
+ save_eptr = create_tmp_var (ptr_type_node, "save_eptr");
+ save_filt = create_tmp_var (integer_type_node, "save_filt");
+ }
i = tsi_start (finally);
x = build (EXC_PTR_EXPR, ptr_type_node);
htab_delete (finally_tree);
collect_eh_region_array ();
+
+ /* Wipe the DECLs we use for saving the EXC_PTR and FILTER_EXPR
+ to ensure we create new ones for the next function. */
+ save_eptr = NULL;
+ save_filt = NULL;
}
struct tree_opt_pass pass_lower_eh =