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caa9d8df0f
This is the first step in a large refactor in how GDB keeps execution history. Rather than using a linked list where multiple entries can describe a single instruction, the history will now be stored in an std::deque, each instruction being one entry in the deque. The choice was initially to use an std::vector, but it would become unwieldy because it needs all the memory to be consecutive, which is hard for 200 thousand entries. Deque was picked because it was a nice midpoint between vector (maximum cache cohesion) and linked list (maximum ease of finding space to store more). Each instruction in memory will be now one record_full_instruction entry, which for this commit just contains a vector of record_full_entry for the effects of the instruction, and the data that was stored in the record_full_end entry (that is, the instruction number and the signal, if any). This change introduced a minimal performance improvement (what's important is that it isn't a degradation) and a reduction in the total memory footprint of roughly 20% if the entire history is used. Reviewed-by: Thiago Jung Bauermann <thiago.bauermann@linaro.org> Reviewed-By: Christina Schimpe <christina.schimpe@intel.com> Approved-By: Guinevere Larsen <guinevere@redhat.com>
53 lines
1.8 KiB
C
53 lines
1.8 KiB
C
/* Process record and replay target for GDB, the GNU debugger.
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Copyright (C) 2013-2026 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#ifndef GDB_RECORD_FULL_H
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#define GDB_RECORD_FULL_H
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#include "gdbsupport/scoped_restore.h"
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extern bool record_full_memory_query;
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/* Type to be used to return values in the gdbarch_process_record hook. */
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enum record_result
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{
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/* Process record does not support instruction $hex at address $hex.
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Process record: failed to record execution log. */
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RECORD_UNSUPPORTED = -2,
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/* Process record: failed to record execution log. */
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RECORD_FAILURE = -1,
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/* No failure. */
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RECORD_SUCCESS = 0,
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/* Process record: inferior program stopped. */
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RECORD_UNKNOWN = 1
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};
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extern int record_full_arch_list_add_reg (struct regcache *regcache, int num);
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extern int record_full_arch_list_add_mem (CORE_ADDR addr, int len);
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/* Returns true if the process record target is open. */
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extern int record_full_is_used (void);
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/* Whether the inferior is being replayed, or is executing normally. */
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extern bool record_full_is_replaying ();
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extern scoped_restore_tmpl<int> record_full_gdb_operation_disable_set ();
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#endif /* GDB_RECORD_FULL_H */
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