* [PATCH] Introduce global DECL_UID -> tree mapping (with pch fixed)
@ 2008-02-26 13:34 Richard Guenther
2008-02-26 14:43 ` Richard Guenther
0 siblings, 1 reply; 3+ messages in thread
From: Richard Guenther @ 2008-02-26 13:34 UTC (permalink / raw)
To: gcc-patches
This is the mapping introduction patch with a fix for the bootstrap
problems that happened in the "right" ggc circumstances. The problem
is that the C++ FE ggc_frees decls, so the memory can be re-used while
the global mapping still points to that memory. Fixed by removing the
decl from the mapping before ggc_freeing it.
I bootstrapped and tested this on x86_64-unknown-linux-gnu with release
checking enabled (this triggered the failure before), and I'll now
re-test the combined patch that makes referenced_vars a bitmap.
I suppose the cp/ change is obvious, so I'll apply the patch again after
that extra testing finished.
Thanks,
Richard.
2007-10-19 Richard Guenther <rguenther@suse.de>
* tree-flow.h (uid_decl_map_hash, uid_decl_map_eq): Move ...
* tree.h (uid_decl_map_hash, uid_decl_map_eq): ... here.
(lookup_decl_from_uid): Declare.
(remove_decl_from_map): Likewise.
* tree-ssa.c (uid_decl_map_eq, uid_decl_map_hash): Move ...
* tree.c (uid_decl_map_eq, uid_decl_map_hash): ... here.
(decl_for_uid_map): New global hashtable mapping DECL_UID
to the decl tree.
(init_ttree): Allocate it.
(insert_decl_to_uid_decl_map): New helper function.
(make_node_stat): Insert new decls into the map.
(copy_node_stat): Likewise.
(lookup_decl_from_uid): New function.
(remove_decl_from_map): Likewise.
(print_decl_for_uid_map_statistics): New helper.
(dump_tree_statistics): Call it.
cp/
* decl.c (duplicate_decls): Remove decl from global mapping
before ggc_freeing it.
Index: trunk/gcc/tree-flow.h
===================================================================
*** trunk.orig/gcc/tree-flow.h 2008-02-26 11:38:19.000000000 +0100
--- trunk/gcc/tree-flow.h 2008-02-26 11:45:24.000000000 +0100
*************** struct int_tree_map GTY(())
*** 569,577 ****
extern unsigned int int_tree_map_hash (const void *);
extern int int_tree_map_eq (const void *, const void *);
- extern unsigned int uid_decl_map_hash (const void *);
- extern int uid_decl_map_eq (const void *, const void *);
-
typedef struct
{
htab_iterator hti;
--- 569,574 ----
Index: trunk/gcc/tree-ssa.c
===================================================================
*** trunk.orig/gcc/tree-ssa.c 2008-02-26 11:38:19.000000000 +0100
--- trunk/gcc/tree-ssa.c 2008-02-26 11:45:24.000000000 +0100
*************** int_tree_map_hash (const void *item)
*** 774,797 ****
return ((const struct int_tree_map *)item)->uid;
}
- /* Return true if the DECL_UID in both trees are equal. */
-
- int
- uid_decl_map_eq (const void *va, const void *vb)
- {
- const_tree a = (const_tree) va;
- const_tree b = (const_tree) vb;
- return (a->decl_minimal.uid == b->decl_minimal.uid);
- }
-
- /* Hash a tree in a uid_decl_map. */
-
- unsigned int
- uid_decl_map_hash (const void *item)
- {
- return ((const_tree)item)->decl_minimal.uid;
- }
-
/* Return true if the uid in both int tree maps are equal. */
static int
--- 774,779 ----
Index: trunk/gcc/tree.c
===================================================================
*** trunk.orig/gcc/tree.c 2008-02-26 11:38:19.000000000 +0100
--- trunk/gcc/tree.c 2008-02-26 13:10:42.000000000 +0100
*************** static GTY(()) int next_decl_uid;
*** 110,115 ****
--- 110,121 ----
/* Unique id for next type created. */
static GTY(()) int next_type_uid = 1;
+ /* Mapping from unique DECL_UID to the decl tree node. */
+ static GTY ((if_marked ("ggc_marked_p"), param_is (union tree_node)))
+ htab_t decl_for_uid_map;
+
+ static void insert_decl_to_uid_decl_map (tree);
+
/* Since we cannot rehash a type after it is in the table, we have to
keep the hash code. */
*************** init_ttree (void)
*** 231,236 ****
--- 237,245 ----
int_cst_node = make_node (INTEGER_CST);
+ decl_for_uid_map = htab_create_ggc (4093, uid_decl_map_hash,
+ uid_decl_map_eq, NULL);
+
tree_contains_struct[FUNCTION_DECL][TS_DECL_NON_COMMON] = 1;
tree_contains_struct[TRANSLATION_UNIT_DECL][TS_DECL_NON_COMMON] = 1;
tree_contains_struct[TYPE_DECL][TS_DECL_NON_COMMON] = 1;
*************** make_node_stat (enum tree_code code MEM_
*** 601,606 ****
--- 610,616 ----
}
DECL_SOURCE_LOCATION (t) = input_location;
DECL_UID (t) = next_decl_uid++;
+ insert_decl_to_uid_decl_map (t);
break;
*************** copy_node_stat (tree node MEM_STAT_DECL)
*** 704,709 ****
--- 714,720 ----
SET_DECL_RESTRICT_BASE (t, DECL_GET_RESTRICT_BASE (node));
DECL_BASED_ON_RESTRICT_P (t) = 1;
}
+ insert_decl_to_uid_decl_map (t);
}
else if (TREE_CODE_CLASS (code) == tcc_type)
{
*************** build_nt_call_list (tree fn, tree arglis
*** 3325,3330 ****
--- 3336,3421 ----
return t;
}
\f
+ /* Return true if the DECL_UID in both trees are equal. */
+
+ int
+ uid_decl_map_eq (const void *va, const void *vb)
+ {
+ const_tree a = (const_tree) va;
+ const_tree b = (const_tree) vb;
+ return (a->decl_minimal.uid == b->decl_minimal.uid);
+ }
+
+ /* Hash a tree in a uid_decl_map. */
+
+ unsigned int
+ uid_decl_map_hash (const void *item)
+ {
+ return ((const_tree)item)->decl_minimal.uid;
+ }
+
+ /* Insert the declaration NODE into the map mapping its unique uid
+ back to the tree. */
+
+ static void
+ insert_decl_to_uid_decl_map (tree node)
+ {
+ void **slot;
+ struct tree_decl_minimal key;
+
+ key.uid = DECL_UID (node);
+ slot = htab_find_slot_with_hash (decl_for_uid_map,
+ &key, DECL_UID (node), INSERT);
+
+ /* We should never try to re-insert a decl with the same uid.
+ ??? The C++ frontend breaks this invariant. Hopefully in a
+ non-fatal way, so just overwrite the slot in this case. */
+ #if 0
+ gcc_assert (!*slot);
+ #endif
+
+ *(tree *)slot = node;
+ }
+
+ /* Lookup the declaration tree from its unique DECL_UID UID. Returns
+ the tree node with DECL_UID UID or NULL, if this node was collected. */
+
+ tree
+ lookup_decl_from_uid (int uid)
+ {
+ struct tree_decl_minimal key;
+
+ key.uid = uid;
+ return (tree) htab_find_with_hash (decl_for_uid_map, &key, uid);
+ }
+
+ /* Remove the declaration tree DECL from the global UID to decl map.
+ This needs to be called if you ggc_free a decl tree, otherwise
+ garbage collection will take care of it. */
+
+ void
+ remove_decl_from_map (tree decl)
+ {
+ struct tree_decl_minimal key;
+
+ key.uid = DECL_UID (decl);
+ #if ENABLE_CHECKING
+ gcc_assert (decl == htab_find_with_hash (decl_for_uid_map, &key, key.uid));
+ #endif
+ htab_remove_elt_with_hash (decl_for_uid_map, &key, key.uid);
+ }
+
+ /* Print out the statistics for the decl_for_uid_map hash table. */
+
+ static void
+ print_decl_for_uid_map_statistics (void)
+ {
+ fprintf (stderr, "DECL_FOR_UID_MAP hash: size %ld, %ld elements, %f collisions\n",
+ (long) htab_size (decl_for_uid_map),
+ (long) htab_elements (decl_for_uid_map),
+ htab_collisions (decl_for_uid_map));
+ }
+
/* Create a DECL_... node of code CODE, name NAME and data type TYPE.
We do NOT enter this node in any sort of symbol table.
*************** dump_tree_statistics (void)
*** 6654,6659 ****
--- 6745,6751 ----
print_debug_expr_statistics ();
print_value_expr_statistics ();
print_restrict_base_statistics ();
+ print_decl_for_uid_map_statistics ();
lang_hooks.print_statistics ();
}
\f
Index: trunk/gcc/tree.h
===================================================================
*** trunk.orig/gcc/tree.h 2008-02-26 11:38:19.000000000 +0100
--- trunk/gcc/tree.h 2008-02-26 13:11:04.000000000 +0100
*************** struct tree_int_map GTY(())
*** 5233,5238 ****
--- 5233,5246 ----
#define tree_int_map_hash tree_map_base_hash
#define tree_int_map_marked_p tree_map_base_marked_p
+ /* Map from a DECL_UID to the decl tree. */
+
+ extern unsigned int uid_decl_map_hash (const void *);
+ extern int uid_decl_map_eq (const void *, const void *);
+ extern tree lookup_decl_from_uid (int);
+ extern void remove_decl_from_map (tree);
+
+
/* Map from a tree to initialization/finalization priorities. */
struct tree_priority_map GTY(())
Index: trunk/gcc/cp/decl.c
===================================================================
*** trunk.orig/gcc/cp/decl.c 2008-02-26 10:52:18.000000000 +0100
--- trunk/gcc/cp/decl.c 2008-02-26 13:12:23.000000000 +0100
*************** duplicate_decls (tree newdecl, tree oldd
*** 2154,2159 ****
--- 2154,2160 ----
/* The NEWDECL will no longer be needed. Because every out-of-class
declaration of a member results in a call to duplicate_decls,
freeing these nodes represents in a significant savings. */
+ remove_decl_from_map (newdecl);
ggc_free (newdecl);
return olddecl;
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH] Introduce global DECL_UID -> tree mapping (with pch fixed)
2008-02-26 13:34 [PATCH] Introduce global DECL_UID -> tree mapping (with pch fixed) Richard Guenther
@ 2008-02-26 14:43 ` Richard Guenther
2008-02-28 12:24 ` Richard Guenther
0 siblings, 1 reply; 3+ messages in thread
From: Richard Guenther @ 2008-02-26 14:43 UTC (permalink / raw)
To: gcc-patches
On Tue, 26 Feb 2008, Richard Guenther wrote:
>
> This is the mapping introduction patch with a fix for the bootstrap
> problems that happened in the "right" ggc circumstances. The problem
> is that the C++ FE ggc_frees decls, so the memory can be re-used while
> the global mapping still points to that memory. Fixed by removing the
> decl from the mapping before ggc_freeing it.
>
> I bootstrapped and tested this on x86_64-unknown-linux-gnu with release
> checking enabled (this triggered the failure before), and I'll now
> re-test the combined patch that makes referenced_vars a bitmap.
>
> I suppose the cp/ change is obvious, so I'll apply the patch again after
> that extra testing finished.
Thus, re-applied as rev. 132676.
Richard.
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH] Introduce global DECL_UID -> tree mapping (with pch fixed)
2008-02-26 14:43 ` Richard Guenther
@ 2008-02-28 12:24 ` Richard Guenther
0 siblings, 0 replies; 3+ messages in thread
From: Richard Guenther @ 2008-02-28 12:24 UTC (permalink / raw)
To: gcc-patches
On Tue, 26 Feb 2008, Richard Guenther wrote:
> On Tue, 26 Feb 2008, Richard Guenther wrote:
>
> >
> > This is the mapping introduction patch with a fix for the bootstrap
> > problems that happened in the "right" ggc circumstances. The problem
> > is that the C++ FE ggc_frees decls, so the memory can be re-used while
> > the global mapping still points to that memory. Fixed by removing the
> > decl from the mapping before ggc_freeing it.
> >
> > I bootstrapped and tested this on x86_64-unknown-linux-gnu with release
> > checking enabled (this triggered the failure before), and I'll now
> > re-test the combined patch that makes referenced_vars a bitmap.
> >
> > I suppose the cp/ change is obvious, so I'll apply the patch again after
> > that extra testing finished.
>
> Thus, re-applied as rev. 132676.
And reverted again due to other problems.
Richard.
^ permalink raw reply [flat|nested] 3+ messages in thread
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2008-02-26 13:34 [PATCH] Introduce global DECL_UID -> tree mapping (with pch fixed) Richard Guenther
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2008-02-28 12:24 ` Richard Guenther
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