1 /* DWARF 2 abbrev table cache 2 3 Copyright (C) 2022-2023 Free Software Foundation, Inc. 4 5 This file is part of GDB. 6 7 This program is free software; you can redistribute it and/or modify 8 it under the terms of the GNU General Public License as published by 9 the Free Software Foundation; either version 3 of the License, or 10 (at your option) any later version. 11 12 This program is distributed in the hope that it will be useful, 13 but WITHOUT ANY WARRANTY; without even the implied warranty of 14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 GNU General Public License for more details. 16 17 You should have received a copy of the GNU General Public License 18 along with this program. If not, see <http://www.gnu.org/licenses/>. */ 19 20 #include "defs.h" 21 #include "dwarf2/read.h" 22 #include "dwarf2/abbrev-cache.h" 23 24 /* Hash function for an abbrev table. */ 25 26 hashval_t 27 abbrev_cache::hash_table (const void *item) 28 { 29 const struct abbrev_table *table = (const struct abbrev_table *) item; 30 return to_underlying (table->sect_off); 31 } 32 33 /* Comparison function for abbrev table. */ 34 35 int 36 abbrev_cache::eq_table (const void *lhs, const void *rhs) 37 { 38 const struct abbrev_table *l_table = (const struct abbrev_table *) lhs; 39 const search_key *key = (const search_key *) rhs; 40 return (l_table->section == key->section 41 && l_table->sect_off == key->offset); 42 } 43 44 abbrev_cache::abbrev_cache () 45 : m_tables (htab_create_alloc (20, hash_table, eq_table, 46 htab_delete_entry<abbrev_table>, 47 xcalloc, xfree)) 48 { 49 } 50 51 void 52 abbrev_cache::add (abbrev_table_up table) 53 { 54 /* We allow this as a convenience to the caller. */ 55 if (table == nullptr) 56 return; 57 58 search_key key = { table->section, table->sect_off }; 59 void **slot = htab_find_slot_with_hash (m_tables.get (), &key, 60 to_underlying (table->sect_off), 61 INSERT); 62 /* If this one already existed, then it should have been reused. */ 63 gdb_assert (*slot == nullptr); 64 *slot = (void *) table.release (); 65 } 66