build_*_type routines which is not the case with the streamer. */
static GTY((if_marked ("ggc_marked_p"), param_is (union tree_node)))
htab_t gimple_types;
+static GTY((if_marked ("ggc_marked_p"), param_is (union tree_node)))
+ htab_t gimple_canonical_types;
static GTY((if_marked ("tree_int_map_marked_p"), param_is (struct tree_int_map)))
htab_t type_hash_cache;
static unsigned int next_dfs_num;
static unsigned int gtc_next_dfs_num;
+
+/* GIMPLE type merging cache. A direct-mapped cache based on TYPE_UID. */
+
+typedef struct GTY(()) gimple_type_leader_entry_s {
+ tree type;
+ tree leader;
+} gimple_type_leader_entry;
+
+#define GIMPLE_TYPE_LEADER_SIZE 16381
+static GTY((length("GIMPLE_TYPE_LEADER_SIZE"))) gimple_type_leader_entry
+ *gimple_type_leader;
+
+/* Lookup an existing leader for T and return it or NULL_TREE, if
+ there is none in the cache. */
+
+static tree
+gimple_lookup_type_leader (tree t)
+{
+ gimple_type_leader_entry *leader;
+
+ if (!gimple_type_leader)
+ return NULL_TREE;
+
+ leader = &gimple_type_leader[TYPE_UID (t) % GIMPLE_TYPE_LEADER_SIZE];
+ if (leader->type != t)
+ return NULL_TREE;
+
+ return leader->leader;
+}
+
/* Return true if T1 and T2 have the same name. If FOR_COMPLETION_P is
true then if any type has no name return false, otherwise return
true if both types have no names. */
/* If the types have been previously registered and found equal
they still are. */
- if (TYPE_CANONICAL (t1)
- && TYPE_CANONICAL (t1) == TYPE_CANONICAL (t2))
- return true;
+ if (mode == GTC_MERGE)
+ {
+ tree leader1 = gimple_lookup_type_leader (t1);
+ tree leader2 = gimple_lookup_type_leader (t2);
+ if (leader1 == t2
+ || t1 == leader2
+ || (leader1 && leader1 == leader2))
+ return true;
+ }
+ else if (mode == GTC_DIAG)
+ {
+ if (TYPE_CANONICAL (t1)
+ && TYPE_CANONICAL (t1) == TYPE_CANONICAL (t2))
+ return true;
+ }
/* Can't be the same type if the types don't have the same code. */
if (TREE_CODE (t1) != TREE_CODE (t2))
goto different_types;
}
+ case NULLPTR_TYPE:
+ /* There is only one decltype(nullptr). */
+ goto same_types;
+
case INTEGER_TYPE:
case BOOLEAN_TYPE:
{
/* If the types have been previously registered and found equal
they still are. */
- if (TYPE_CANONICAL (t1)
- && TYPE_CANONICAL (t1) == TYPE_CANONICAL (t2))
- return true;
+ if (mode == GTC_MERGE)
+ {
+ tree leader1 = gimple_lookup_type_leader (t1);
+ tree leader2 = gimple_lookup_type_leader (t2);
+ if (leader1 == t2
+ || t1 == leader2
+ || (leader1 && leader1 == leader2))
+ return true;
+ }
+ else if (mode == GTC_DIAG)
+ {
+ if (TYPE_CANONICAL (t1)
+ && TYPE_CANONICAL (t1) == TYPE_CANONICAL (t2))
+ return true;
+ }
/* Can't be the same type if the types don't have the same code. */
if (TREE_CODE (t1) != TREE_CODE (t2))
void **slot;
struct sccs *state;
-#ifdef ENABLE_CHECKING
/* Not visited during this DFS walk. */
- gcc_assert (!pointer_map_contains (sccstate, type));
-#endif
+ gcc_checking_assert (!pointer_map_contains (sccstate, type));
state = XOBNEW (sccstate_obstack, struct sccs);
*pointer_map_insert (sccstate, type) = state;
gimple_register_type (tree t)
{
void **slot;
+ gimple_type_leader_entry *leader;
gcc_assert (TYPE_P (t));
- /* In TYPE_CANONICAL we cache the result of gimple_register_type.
- It is initially set to NULL during LTO streaming.
- But do not mess with TYPE_CANONICAL when not in WPA or link phase. */
- if (in_lto_p && TYPE_CANONICAL (t))
- return TYPE_CANONICAL (t);
+ if (!gimple_type_leader)
+ gimple_type_leader = ggc_alloc_cleared_vec_gimple_type_leader_entry_s
+ (GIMPLE_TYPE_LEADER_SIZE);
+ /* If we registered this type before return the cached result. */
+ leader = &gimple_type_leader[TYPE_UID (t) % GIMPLE_TYPE_LEADER_SIZE];
+ if (leader->type == t)
+ return leader->leader;
/* Always register the main variant first. This is important so we
pick up the non-typedef variants as canonical, otherwise we'll end
TYPE_NEXT_REF_TO (t) = NULL_TREE;
}
- if (in_lto_p)
- TYPE_CANONICAL (t) = new_type;
+ leader->type = t;
+ leader->leader = new_type;
+ t = new_type;
+ }
+ else
+ {
+ leader->type = t;
+ leader->leader = t;
+ *slot = (void *) t;
+ }
+
+ return t;
+}
+
+
+/* Returns nonzero if P1 and P2 are equal. */
+
+static int
+gimple_canonical_type_eq (const void *p1, const void *p2)
+{
+ const_tree t1 = (const_tree) p1;
+ const_tree t2 = (const_tree) p2;
+ return gimple_types_compatible_p (CONST_CAST_TREE (t1),
+ CONST_CAST_TREE (t2), GTC_DIAG);
+}
+
+/* Register type T in the global type table gimple_types.
+ If another type T', compatible with T, already existed in
+ gimple_types then return T', otherwise return T. This is used by
+ LTO to merge identical types read from different TUs. */
+
+tree
+gimple_register_canonical_type (tree t)
+{
+ void **slot;
+
+ gcc_assert (TYPE_P (t));
+
+ if (TYPE_CANONICAL (t))
+ return TYPE_CANONICAL (t);
+
+ /* Always register the main variant first. This is important so we
+ pick up the non-typedef variants as canonical, otherwise we'll end
+ up taking typedef ids for structure tags during comparison. */
+ if (TYPE_MAIN_VARIANT (t) != t)
+ gimple_register_canonical_type (TYPE_MAIN_VARIANT (t));
+
+ if (gimple_canonical_types == NULL)
+ gimple_canonical_types = htab_create_ggc (16381, gimple_type_hash,
+ gimple_canonical_type_eq, 0);
+
+ slot = htab_find_slot (gimple_canonical_types, t, INSERT);
+ if (*slot
+ && *(tree *)slot != t)
+ {
+ tree new_type = (tree) *((tree *) slot);
+
+ TYPE_CANONICAL (t) = new_type;
t = new_type;
}
else
{
- if (in_lto_p)
- TYPE_CANONICAL (t) = t;
+ TYPE_CANONICAL (t) = t;
*slot = (void *) t;
}
htab_collisions (gimple_types));
else
fprintf (stderr, "GIMPLE type table is empty\n");
+ if (gimple_canonical_types)
+ fprintf (stderr, "GIMPLE canonical type table: size %ld, %ld elements, "
+ "%ld searches, %ld collisions (ratio: %f)\n",
+ (long) htab_size (gimple_canonical_types),
+ (long) htab_elements (gimple_canonical_types),
+ (long) gimple_canonical_types->searches,
+ (long) gimple_canonical_types->collisions,
+ htab_collisions (gimple_canonical_types));
+ else
+ fprintf (stderr, "GIMPLE canonical type table is empty\n");
if (type_hash_cache)
fprintf (stderr, "GIMPLE type hash table: size %ld, %ld elements, "
"%ld searches, %ld collisions (ratio: %f)\n",
htab_delete (gimple_types);
gimple_types = NULL;
}
+ if (gimple_canonical_types)
+ {
+ htab_delete (gimple_canonical_types);
+ gimple_canonical_types = NULL;
+ }
if (type_hash_cache)
{
htab_delete (type_hash_cache);
obstack_free (>c_ob, NULL);
gtc_visited = NULL;
}
+ gimple_type_leader = NULL;
}
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