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[PATCH] symbol cache: hash STRUCT_DOMAIN symbols as VAR_DOMAIN
- From: Doug Evans <xdje42 at gmail dot com>
- To: gdb-patches at sourceware dot org
- Date: Wed, 04 Feb 2015 19:28:19 -0800
- Subject: [PATCH] symbol cache: hash STRUCT_DOMAIN symbols as VAR_DOMAIN
- Authentication-results: sourceware.org; auth=none
Hi.
While looking at the contents of the symbol cache after adding support
for trying multiple slots I noticed structs occupying more than one slot.
This is due to symbol_matches_domain support.
This patch fixes it by treating STRUCT_DOMAIN as VAR_DOMAIN
when computing the hash.
I also added symbol domain names to debugging output as it was useful.
2015-02-04 Doug Evans <xdje42@gmail.com>
* symtab.c (hash_symbol_entry): Hash STRUCT_DOMAIN symbols as
VAR_DOMAIN.
(symbol_cache_lookup): Clarify use of bsc_ptr, slot_ptr parameters.
Include symbol domain in debugging output.
diff --git a/gdb/symtab.c b/gdb/symtab.c
index 84e2680..efa4f81 100644
--- a/gdb/symtab.c
+++ b/gdb/symtab.c
@@ -1173,7 +1173,12 @@ hash_symbol_entry (const struct objfile *objfile_context,
if (name != NULL)
hash += htab_hash_string (name);
- hash += domain;
+ /* Because of symbol_matches_domain we need VAR_DOMAIN and STRUCT_DOMAIN
+ to map to the same slot. */
+ if (domain == STRUCT_DOMAIN)
+ hash += VAR_DOMAIN * 7;
+ else
+ hash += domain * 7;
return hash;
}
@@ -1387,8 +1392,9 @@ set_symbol_cache_size_handler (char *args, int from_tty,
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.
- *BSC_PTR, *SLOT_PTR are set to the cache and slot of the symbol, whether
- found or not found. */
+ 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 symbol *
symbol_cache_lookup (struct symbol_cache *cache,
@@ -1414,8 +1420,6 @@ symbol_cache_lookup (struct symbol_cache *cache,
hash = hash_symbol_entry (objfile_context, name, domain);
slot = bsc->symbols + hash % bsc->size;
- *bsc_ptr = bsc;
- *slot_ptr = slot;
if (eq_symbol_entry (slot, objfile_context, name, domain))
{
@@ -1432,6 +1436,11 @@ symbol_cache_lookup (struct symbol_cache *cache,
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,
@@ -1580,14 +1589,16 @@ symbol_cache_dump (const struct symbol_cache *cache)
case SYMBOL_SLOT_UNUSED:
break;
case SYMBOL_SLOT_NOT_FOUND:
- printf_filtered (" [%-4u] = %s, %s (not found)\n", i,
+ printf_filtered (" [%4u] = %s, %s %s (not found)\n", i,
host_address_to_string (slot->objfile_context),
- slot->value.not_found.name);
+ slot->value.not_found.name,
+ domain_name (slot->value.not_found.domain));
break;
case SYMBOL_SLOT_FOUND:
- printf_filtered (" [%-4u] = %s, %s\n", i,
+ printf_filtered (" [%4u] = %s, %s %s\n", i,
host_address_to_string (slot->objfile_context),
- SYMBOL_PRINT_NAME (slot->value.found));
+ SYMBOL_PRINT_NAME (slot->value.found),
+ domain_name (SYMBOL_DOMAIN (slot->value.found)));
break;
}
}