+ struct symbol_cache *cache
+ = (struct symbol_cache *) program_space_data (pspace, symbol_cache_key);
+
+ /* The pspace could have been created but not have a cache yet. */
+ if (cache != NULL)
+ resize_symbol_cache (cache, new_size);
+ }
+}
+
+/* Called when symbol-cache-size is set. */
+
+static void
+set_symbol_cache_size_handler (char *args, int from_tty,
+ struct cmd_list_element *c)
+{
+ if (new_symbol_cache_size > MAX_SYMBOL_CACHE_SIZE)
+ {
+ /* Restore the previous value.
+ This is the value the "show" command prints. */
+ new_symbol_cache_size = symbol_cache_size;
+
+ error (_("Symbol cache size is too large, max is %u."),
+ MAX_SYMBOL_CACHE_SIZE);
+ }
+ symbol_cache_size = new_symbol_cache_size;
+
+ set_symbol_cache_size (symbol_cache_size);
+}
+
+/* Lookup symbol NAME,DOMAIN in BLOCK in the symbol cache of PSPACE.
+ OBJFILE_CONTEXT is the current objfile, which may be NULL.
+ The result is the symbol if found, SYMBOL_LOOKUP_FAILED if a previous lookup
+ failed (and thus this one will too), or NULL if the symbol is not present
+ in the cache.
+ If the symbol is not present in the cache, then *BSC_PTR and *SLOT_PTR are
+ set to the cache and slot of the symbol to save the result of a full lookup
+ attempt. */
+
+static struct block_symbol
+symbol_cache_lookup (struct symbol_cache *cache,
+ struct objfile *objfile_context, int block,
+ const char *name, domain_enum domain,
+ struct block_symbol_cache **bsc_ptr,
+ struct symbol_cache_slot **slot_ptr)
+{
+ struct block_symbol_cache *bsc;
+ unsigned int hash;
+ struct symbol_cache_slot *slot;
+
+ if (block == GLOBAL_BLOCK)
+ bsc = cache->global_symbols;
+ else
+ bsc = cache->static_symbols;
+ if (bsc == NULL)
+ {
+ *bsc_ptr = NULL;
+ *slot_ptr = NULL;
+ return (struct block_symbol) {NULL, NULL};
+ }
+
+ hash = hash_symbol_entry (objfile_context, name, domain);
+ slot = bsc->symbols + hash % bsc->size;
+
+ if (eq_symbol_entry (slot, objfile_context, name, domain))
+ {
+ if (symbol_lookup_debug)
+ fprintf_unfiltered (gdb_stdlog,
+ "%s block symbol cache hit%s for %s, %s\n",
+ block == GLOBAL_BLOCK ? "Global" : "Static",
+ slot->state == SYMBOL_SLOT_NOT_FOUND
+ ? " (not found)" : "",
+ name, domain_name (domain));
+ ++bsc->hits;
+ if (slot->state == SYMBOL_SLOT_NOT_FOUND)
+ return SYMBOL_LOOKUP_FAILED;
+ return slot->value.found;
+ }
+
+ /* Symbol is not present in the cache. */
+
+ *bsc_ptr = bsc;
+ *slot_ptr = slot;
+
+ if (symbol_lookup_debug)
+ {
+ fprintf_unfiltered (gdb_stdlog,
+ "%s block symbol cache miss for %s, %s\n",
+ block == GLOBAL_BLOCK ? "Global" : "Static",
+ name, domain_name (domain));
+ }
+ ++bsc->misses;
+ return (struct block_symbol) {NULL, NULL};
+}
+
+/* Clear out SLOT. */
+
+static void
+symbol_cache_clear_slot (struct symbol_cache_slot *slot)
+{
+ if (slot->state == SYMBOL_SLOT_NOT_FOUND)
+ xfree (slot->value.not_found.name);
+ slot->state = SYMBOL_SLOT_UNUSED;
+}
+
+/* Mark SYMBOL as found in SLOT.
+ OBJFILE_CONTEXT is the current objfile when the lookup was done, or NULL
+ if it's not needed to distinguish lookups (STATIC_BLOCK). It is *not*
+ necessarily the objfile the symbol was found in. */
+
+static void
+symbol_cache_mark_found (struct block_symbol_cache *bsc,
+ struct symbol_cache_slot *slot,
+ struct objfile *objfile_context,
+ struct symbol *symbol,
+ const struct block *block)
+{
+ if (bsc == NULL)
+ return;
+ if (slot->state != SYMBOL_SLOT_UNUSED)
+ {
+ ++bsc->collisions;
+ symbol_cache_clear_slot (slot);
+ }
+ slot->state = SYMBOL_SLOT_FOUND;
+ slot->objfile_context = objfile_context;
+ slot->value.found.symbol = symbol;
+ slot->value.found.block = block;
+}
+
+/* Mark symbol NAME, DOMAIN as not found in SLOT.
+ OBJFILE_CONTEXT is the current objfile when the lookup was done, or NULL
+ if it's not needed to distinguish lookups (STATIC_BLOCK). */
+
+static void
+symbol_cache_mark_not_found (struct block_symbol_cache *bsc,
+ struct symbol_cache_slot *slot,
+ struct objfile *objfile_context,
+ const char *name, domain_enum domain)
+{
+ if (bsc == NULL)
+ return;
+ if (slot->state != SYMBOL_SLOT_UNUSED)
+ {
+ ++bsc->collisions;
+ symbol_cache_clear_slot (slot);
+ }
+ slot->state = SYMBOL_SLOT_NOT_FOUND;
+ slot->objfile_context = objfile_context;
+ slot->value.not_found.name = xstrdup (name);
+ slot->value.not_found.domain = domain;
+}
+
+/* Flush the symbol cache of PSPACE. */
+
+static void
+symbol_cache_flush (struct program_space *pspace)
+{
+ struct symbol_cache *cache
+ = (struct symbol_cache *) program_space_data (pspace, symbol_cache_key);
+ int pass;
+
+ if (cache == NULL)
+ return;
+ if (cache->global_symbols == NULL)
+ {
+ gdb_assert (symbol_cache_size == 0);
+ gdb_assert (cache->static_symbols == NULL);
+ return;
+ }
+
+ /* If the cache is untouched since the last flush, early exit.
+ This is important for performance during the startup of a program linked
+ with 100s (or 1000s) of shared libraries. */
+ if (cache->global_symbols->misses == 0
+ && cache->static_symbols->misses == 0)
+ return;
+
+ gdb_assert (cache->global_symbols->size == symbol_cache_size);
+ gdb_assert (cache->static_symbols->size == symbol_cache_size);
+
+ for (pass = 0; pass < 2; ++pass)
+ {
+ struct block_symbol_cache *bsc
+ = pass == 0 ? cache->global_symbols : cache->static_symbols;
+ unsigned int i;
+
+ for (i = 0; i < bsc->size; ++i)
+ symbol_cache_clear_slot (&bsc->symbols[i]);
+ }
+
+ cache->global_symbols->hits = 0;
+ cache->global_symbols->misses = 0;
+ cache->global_symbols->collisions = 0;
+ cache->static_symbols->hits = 0;
+ cache->static_symbols->misses = 0;
+ cache->static_symbols->collisions = 0;
+}
+
+/* Dump CACHE. */
+
+static void
+symbol_cache_dump (const struct symbol_cache *cache)
+{
+ int pass;
+
+ if (cache->global_symbols == NULL)
+ {
+ printf_filtered (" <disabled>\n");
+ return;
+ }
+
+ for (pass = 0; pass < 2; ++pass)
+ {
+ const struct block_symbol_cache *bsc
+ = pass == 0 ? cache->global_symbols : cache->static_symbols;
+ unsigned int i;
+
+ if (pass == 0)
+ printf_filtered ("Global symbols:\n");