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- /* Process record and replay target for GDB, the GNU debugger.
- Copyright (C) 2008-2022 Free Software Foundation, Inc.
- This file is part of GDB.
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 3 of the License, or
- (at your option) any later version.
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
- You should have received a copy of the GNU General Public License
- along with this program. If not, see <http://www.gnu.org/licenses/>. */
- #include "defs.h"
- #include "gdbcmd.h"
- #include "completer.h"
- #include "record.h"
- #include "observable.h"
- #include "inferior.h"
- #include "gdbsupport/common-utils.h"
- #include "cli/cli-utils.h"
- #include "disasm.h"
- #include <ctype.h>
- /* This is the debug switch for process record. */
- unsigned int record_debug = 0;
- /* The number of instructions to print in "record instruction-history". */
- static unsigned int record_insn_history_size = 10;
- /* The variable registered as control variable in the "record
- instruction-history" command. Necessary for extra input
- validation. */
- static unsigned int record_insn_history_size_setshow_var;
- /* The number of functions to print in "record function-call-history". */
- static unsigned int record_call_history_size = 10;
- /* The variable registered as control variable in the "record
- call-history" command. Necessary for extra input validation. */
- static unsigned int record_call_history_size_setshow_var;
- struct cmd_list_element *record_cmdlist = NULL;
- static struct cmd_list_element *record_goto_cmdlist = NULL;
- struct cmd_list_element *set_record_cmdlist = NULL;
- struct cmd_list_element *show_record_cmdlist = NULL;
- struct cmd_list_element *info_record_cmdlist = NULL;
- #define DEBUG(msg, args...) \
- if (record_debug) \
- gdb_printf (gdb_stdlog, "record: " msg "\n", ##args)
- /* See record.h. */
- struct target_ops *
- find_record_target (void)
- {
- return find_target_at (record_stratum);
- }
- /* Check that recording is active. Throw an error, if it isn't. */
- static struct target_ops *
- require_record_target (void)
- {
- struct target_ops *t;
- t = find_record_target ();
- if (t == NULL)
- error (_("No recording is currently active.\n"
- "Use the \"record full\" or \"record btrace\" command first."));
- return t;
- }
- /* See record.h. */
- void
- record_preopen (void)
- {
- /* Check if a record target is already running. */
- if (find_record_target () != NULL)
- error (_("The process is already being recorded. Use \"record stop\" to "
- "stop recording first."));
- }
- /* See record.h. */
- void
- record_start (const char *method, const char *format, int from_tty)
- {
- if (method == NULL)
- {
- if (format == NULL)
- execute_command_to_string ("record", from_tty, false);
- else
- error (_("Invalid format."));
- }
- else if (strcmp (method, "full") == 0)
- {
- if (format == NULL)
- execute_command_to_string ("record full", from_tty, false);
- else
- error (_("Invalid format."));
- }
- else if (strcmp (method, "btrace") == 0)
- {
- if (format == NULL)
- execute_command_to_string ("record btrace", from_tty, false);
- else if (strcmp (format, "bts") == 0)
- execute_command_to_string ("record btrace bts", from_tty, false);
- else if (strcmp (format, "pt") == 0)
- execute_command_to_string ("record btrace pt", from_tty, false);
- else
- error (_("Invalid format."));
- }
- else
- error (_("Invalid method."));
- }
- /* See record.h. */
- void
- record_stop (int from_tty)
- {
- execute_command_to_string ("record stop", from_tty, false);
- }
- /* See record.h. */
- int
- record_read_memory (struct gdbarch *gdbarch,
- CORE_ADDR memaddr, gdb_byte *myaddr,
- ssize_t len)
- {
- int ret = target_read_memory (memaddr, myaddr, len);
- if (ret != 0)
- DEBUG ("error reading memory at addr %s len = %ld.\n",
- paddress (gdbarch, memaddr), (long) len);
- return ret;
- }
- /* Stop recording. */
- static void
- record_stop (struct target_ops *t)
- {
- DEBUG ("stop %s", t->shortname ());
- t->stop_recording ();
- }
- /* Unpush the record target. */
- static void
- record_unpush (struct target_ops *t)
- {
- DEBUG ("unpush %s", t->shortname ());
- current_inferior ()->unpush_target (t);
- }
- /* See record.h. */
- void
- record_disconnect (struct target_ops *t, const char *args, int from_tty)
- {
- gdb_assert (t->stratum () == record_stratum);
- DEBUG ("disconnect %s", t->shortname ());
- record_stop (t);
- record_unpush (t);
- target_disconnect (args, from_tty);
- }
- /* See record.h. */
- void
- record_detach (struct target_ops *t, inferior *inf, int from_tty)
- {
- gdb_assert (t->stratum () == record_stratum);
- DEBUG ("detach %s", t->shortname ());
- record_stop (t);
- record_unpush (t);
- target_detach (inf, from_tty);
- }
- /* See record.h. */
- void
- record_mourn_inferior (struct target_ops *t)
- {
- gdb_assert (t->stratum () == record_stratum);
- DEBUG ("mourn inferior %s", t->shortname ());
- /* It is safer to not stop recording. Resources will be freed when
- threads are discarded. */
- record_unpush (t);
- target_mourn_inferior (inferior_ptid);
- }
- /* See record.h. */
- void
- record_kill (struct target_ops *t)
- {
- gdb_assert (t->stratum () == record_stratum);
- DEBUG ("kill %s", t->shortname ());
- /* It is safer to not stop recording. Resources will be freed when
- threads are discarded. */
- record_unpush (t);
- target_kill ();
- }
- /* See record.h. */
- int
- record_check_stopped_by_breakpoint (const address_space *aspace,
- CORE_ADDR pc,
- enum target_stop_reason *reason)
- {
- if (breakpoint_inserted_here_p (aspace, pc))
- {
- if (hardware_breakpoint_inserted_here_p (aspace, pc))
- *reason = TARGET_STOPPED_BY_HW_BREAKPOINT;
- else
- *reason = TARGET_STOPPED_BY_SW_BREAKPOINT;
- return 1;
- }
- *reason = TARGET_STOPPED_BY_NO_REASON;
- return 0;
- }
- /* Implement "show record debug" command. */
- static void
- show_record_debug (struct ui_file *file, int from_tty,
- struct cmd_list_element *c, const char *value)
- {
- gdb_printf (file, _("Debugging of process record target is %s.\n"),
- value);
- }
- /* Alias for "target record". */
- static void
- cmd_record_start (const char *args, int from_tty)
- {
- execute_command ("target record-full", from_tty);
- }
- /* Truncate the record log from the present point
- of replay until the end. */
- static void
- cmd_record_delete (const char *args, int from_tty)
- {
- require_record_target ();
- if (!target_record_is_replaying (inferior_ptid))
- {
- gdb_printf (_("Already at end of record list.\n"));
- return;
- }
- if (!target_supports_delete_record ())
- {
- gdb_printf (_("The current record target does not support "
- "this operation.\n"));
- return;
- }
- if (!from_tty || query (_("Delete the log from this point forward "
- "and begin to record the running message "
- "at current PC?")))
- target_delete_record ();
- }
- /* Implement the "stoprecord" or "record stop" command. */
- static void
- cmd_record_stop (const char *args, int from_tty)
- {
- struct target_ops *t;
- t = require_record_target ();
- record_stop (t);
- record_unpush (t);
- gdb_printf (_("Process record is stopped and all execution "
- "logs are deleted.\n"));
- gdb::observers::record_changed.notify (current_inferior (), 0, NULL, NULL);
- }
- /* The "info record" command. */
- static void
- info_record_command (const char *args, int from_tty)
- {
- struct target_ops *t;
- t = find_record_target ();
- if (t == NULL)
- {
- gdb_printf (_("No recording is currently active.\n"));
- return;
- }
- gdb_printf (_("Active record target: %s\n"), t->shortname ());
- t->info_record ();
- }
- /* The "record save" command. */
- static void
- cmd_record_save (const char *args, int from_tty)
- {
- const char *recfilename;
- char recfilename_buffer[40];
- require_record_target ();
- if (args != NULL && *args != 0)
- recfilename = args;
- else
- {
- /* Default recfile name is "gdb_record.PID". */
- xsnprintf (recfilename_buffer, sizeof (recfilename_buffer),
- "gdb_record.%d", inferior_ptid.pid ());
- recfilename = recfilename_buffer;
- }
- target_save_record (recfilename);
- }
- /* See record.h. */
- void
- record_goto (const char *arg)
- {
- ULONGEST insn;
- if (arg == NULL || *arg == '\0')
- error (_("Command requires an argument (insn number to go to)."));
- insn = parse_and_eval_long (arg);
- require_record_target ();
- target_goto_record (insn);
- }
- /* "record goto" command. Argument is an instruction number,
- as given by "info record".
- Rewinds the recording (forward or backward) to the given instruction. */
- static void
- cmd_record_goto (const char *arg, int from_tty)
- {
- record_goto (arg);
- }
- /* The "record goto begin" command. */
- static void
- cmd_record_goto_begin (const char *arg, int from_tty)
- {
- if (arg != NULL && *arg != '\0')
- error (_("Junk after argument: %s."), arg);
- require_record_target ();
- target_goto_record_begin ();
- }
- /* The "record goto end" command. */
- static void
- cmd_record_goto_end (const char *arg, int from_tty)
- {
- if (arg != NULL && *arg != '\0')
- error (_("Junk after argument: %s."), arg);
- require_record_target ();
- target_goto_record_end ();
- }
- /* Read an instruction number from an argument string. */
- static ULONGEST
- get_insn_number (const char **arg)
- {
- ULONGEST number;
- const char *begin, *end, *pos;
- begin = *arg;
- pos = skip_spaces (begin);
- if (!isdigit (*pos))
- error (_("Expected positive number, got: %s."), pos);
- number = strtoulst (pos, &end, 10);
- *arg += (end - begin);
- return number;
- }
- /* Read a context size from an argument string. */
- static int
- get_context_size (const char **arg)
- {
- const char *pos;
- char *end;
- pos = skip_spaces (*arg);
- if (!isdigit (*pos))
- error (_("Expected positive number, got: %s."), pos);
- long result = strtol (pos, &end, 10);
- *arg = end;
- return result;
- }
- /* Complain about junk at the end of an argument string. */
- static void
- no_chunk (const char *arg)
- {
- if (*arg != 0)
- error (_("Junk after argument: %s."), arg);
- }
- /* Read instruction-history modifiers from an argument string. */
- static gdb_disassembly_flags
- get_insn_history_modifiers (const char **arg)
- {
- gdb_disassembly_flags modifiers;
- const char *args;
- modifiers = 0;
- args = *arg;
- if (args == NULL)
- return modifiers;
- while (*args == '/')
- {
- ++args;
- if (*args == '\0')
- error (_("Missing modifier."));
- for (; *args; ++args)
- {
- if (isspace (*args))
- break;
- if (*args == '/')
- continue;
- switch (*args)
- {
- case 'm':
- case 's':
- modifiers |= DISASSEMBLY_SOURCE;
- modifiers |= DISASSEMBLY_FILENAME;
- break;
- case 'r':
- modifiers |= DISASSEMBLY_RAW_INSN;
- break;
- case 'f':
- modifiers |= DISASSEMBLY_OMIT_FNAME;
- break;
- case 'p':
- modifiers |= DISASSEMBLY_OMIT_PC;
- break;
- default:
- error (_("Invalid modifier: %c."), *args);
- }
- }
- args = skip_spaces (args);
- }
- /* Update the argument string. */
- *arg = args;
- return modifiers;
- }
- /* The "set record instruction-history-size / set record
- function-call-history-size" commands are unsigned, with UINT_MAX
- meaning unlimited. The target interfaces works with signed int
- though, to indicate direction, so map "unlimited" to INT_MAX, which
- is about the same as unlimited in practice. If the user does have
- a log that huge, she can fetch it in chunks across several requests,
- but she'll likely have other problems first... */
- static int
- command_size_to_target_size (unsigned int size)
- {
- gdb_assert (size <= INT_MAX || size == UINT_MAX);
- if (size == UINT_MAX)
- return INT_MAX;
- else
- return size;
- }
- /* The "record instruction-history" command. */
- static void
- cmd_record_insn_history (const char *arg, int from_tty)
- {
- require_record_target ();
- gdb_disassembly_flags flags = get_insn_history_modifiers (&arg);
- int size = command_size_to_target_size (record_insn_history_size);
- if (arg == NULL || *arg == 0 || strcmp (arg, "+") == 0)
- target_insn_history (size, flags);
- else if (strcmp (arg, "-") == 0)
- target_insn_history (-size, flags);
- else
- {
- ULONGEST begin, end;
- begin = get_insn_number (&arg);
- if (*arg == ',')
- {
- arg = skip_spaces (++arg);
- if (*arg == '+')
- {
- arg += 1;
- size = get_context_size (&arg);
- no_chunk (arg);
- target_insn_history_from (begin, size, flags);
- }
- else if (*arg == '-')
- {
- arg += 1;
- size = get_context_size (&arg);
- no_chunk (arg);
- target_insn_history_from (begin, -size, flags);
- }
- else
- {
- end = get_insn_number (&arg);
- no_chunk (arg);
- target_insn_history_range (begin, end, flags);
- }
- }
- else
- {
- no_chunk (arg);
- target_insn_history_from (begin, size, flags);
- }
- dont_repeat ();
- }
- }
- /* Read function-call-history modifiers from an argument string. */
- static record_print_flags
- get_call_history_modifiers (const char **arg)
- {
- record_print_flags modifiers = 0;
- const char *args = *arg;
- if (args == NULL)
- return modifiers;
- while (*args == '/')
- {
- ++args;
- if (*args == '\0')
- error (_("Missing modifier."));
- for (; *args; ++args)
- {
- if (isspace (*args))
- break;
- if (*args == '/')
- continue;
- switch (*args)
- {
- case 'l':
- modifiers |= RECORD_PRINT_SRC_LINE;
- break;
- case 'i':
- modifiers |= RECORD_PRINT_INSN_RANGE;
- break;
- case 'c':
- modifiers |= RECORD_PRINT_INDENT_CALLS;
- break;
- default:
- error (_("Invalid modifier: %c."), *args);
- }
- }
- args = skip_spaces (args);
- }
- /* Update the argument string. */
- *arg = args;
- return modifiers;
- }
- /* The "record function-call-history" command. */
- static void
- cmd_record_call_history (const char *arg, int from_tty)
- {
- require_record_target ();
- record_print_flags flags = get_call_history_modifiers (&arg);
- int size = command_size_to_target_size (record_call_history_size);
- if (arg == NULL || *arg == 0 || strcmp (arg, "+") == 0)
- target_call_history (size, flags);
- else if (strcmp (arg, "-") == 0)
- target_call_history (-size, flags);
- else
- {
- ULONGEST begin, end;
- begin = get_insn_number (&arg);
- if (*arg == ',')
- {
- arg = skip_spaces (++arg);
- if (*arg == '+')
- {
- arg += 1;
- size = get_context_size (&arg);
- no_chunk (arg);
- target_call_history_from (begin, size, flags);
- }
- else if (*arg == '-')
- {
- arg += 1;
- size = get_context_size (&arg);
- no_chunk (arg);
- target_call_history_from (begin, -size, flags);
- }
- else
- {
- end = get_insn_number (&arg);
- no_chunk (arg);
- target_call_history_range (begin, end, flags);
- }
- }
- else
- {
- no_chunk (arg);
- target_call_history_from (begin, size, flags);
- }
- dont_repeat ();
- }
- }
- /* Helper for "set record instruction-history-size" and "set record
- function-call-history-size" input validation. COMMAND_VAR is the
- variable registered in the command as control variable. *SETTING
- is the real setting the command allows changing. */
- static void
- validate_history_size (unsigned int *command_var, unsigned int *setting)
- {
- if (*command_var != UINT_MAX && *command_var > INT_MAX)
- {
- unsigned int new_value = *command_var;
- /* Restore previous value. */
- *command_var = *setting;
- error (_("integer %u out of range"), new_value);
- }
- /* Commit new value. */
- *setting = *command_var;
- }
- /* Called by do_setshow_command. We only want values in the
- [0..INT_MAX] range, while the command's machinery accepts
- [0..UINT_MAX]. See command_size_to_target_size. */
- static void
- set_record_insn_history_size (const char *args, int from_tty,
- struct cmd_list_element *c)
- {
- validate_history_size (&record_insn_history_size_setshow_var,
- &record_insn_history_size);
- }
- /* Called by do_setshow_command. We only want values in the
- [0..INT_MAX] range, while the command's machinery accepts
- [0..UINT_MAX]. See command_size_to_target_size. */
- static void
- set_record_call_history_size (const char *args, int from_tty,
- struct cmd_list_element *c)
- {
- validate_history_size (&record_call_history_size_setshow_var,
- &record_call_history_size);
- }
- void _initialize_record ();
- void
- _initialize_record ()
- {
- struct cmd_list_element *c;
- add_setshow_zuinteger_cmd ("record", no_class, &record_debug,
- _("Set debugging of record/replay feature."),
- _("Show debugging of record/replay feature."),
- _("When enabled, debugging output for "
- "record/replay feature is displayed."),
- NULL, show_record_debug, &setdebuglist,
- &showdebuglist);
- add_setshow_uinteger_cmd ("instruction-history-size", no_class,
- &record_insn_history_size_setshow_var, _("\
- Set number of instructions to print in \"record instruction-history\"."), _("\
- Show number of instructions to print in \"record instruction-history\"."), _("\
- A size of \"unlimited\" means unlimited instructions. The default is 10."),
- set_record_insn_history_size, NULL,
- &set_record_cmdlist, &show_record_cmdlist);
- add_setshow_uinteger_cmd ("function-call-history-size", no_class,
- &record_call_history_size_setshow_var, _("\
- Set number of function to print in \"record function-call-history\"."), _("\
- Show number of functions to print in \"record function-call-history\"."), _("\
- A size of \"unlimited\" means unlimited lines. The default is 10."),
- set_record_call_history_size, NULL,
- &set_record_cmdlist, &show_record_cmdlist);
- cmd_list_element *record_cmd
- = add_prefix_cmd ("record", class_obscure, cmd_record_start,
- _("Start recording."),
- &record_cmdlist, 0, &cmdlist);
- set_cmd_completer (record_cmd, filename_completer);
- add_com_alias ("rec", record_cmd, class_obscure, 1);
- set_show_commands setshow_record_cmds
- = add_setshow_prefix_cmd ("record", class_support,
- _("Set record options."),
- _("Show record options."),
- &set_record_cmdlist, &show_record_cmdlist,
- &setlist, &showlist);
- add_alias_cmd ("rec", setshow_record_cmds.set, class_obscure, 1, &setlist);
- add_alias_cmd ("rec", setshow_record_cmds.show, class_obscure, 1, &showlist);
- cmd_list_element *info_record_cmd
- = add_prefix_cmd ("record", class_support, info_record_command,
- _("Info record options."), &info_record_cmdlist,
- 0, &infolist);
- add_alias_cmd ("rec", info_record_cmd, class_obscure, 1, &infolist);
- c = add_cmd ("save", class_obscure, cmd_record_save,
- _("Save the execution log to a file.\n\
- Usage: record save [FILENAME]\n\
- Default filename is 'gdb_record.PROCESS_ID'."),
- &record_cmdlist);
- set_cmd_completer (c, filename_completer);
- cmd_list_element *record_delete_cmd
- = add_cmd ("delete", class_obscure, cmd_record_delete,
- _("Delete the rest of execution log and start recording it \
- anew."),
- &record_cmdlist);
- add_alias_cmd ("d", record_delete_cmd, class_obscure, 1, &record_cmdlist);
- add_alias_cmd ("del", record_delete_cmd, class_obscure, 1, &record_cmdlist);
- cmd_list_element *record_stop_cmd
- = add_cmd ("stop", class_obscure, cmd_record_stop,
- _("Stop the record/replay target."),
- &record_cmdlist);
- add_alias_cmd ("s", record_stop_cmd, class_obscure, 1, &record_cmdlist);
- add_prefix_cmd ("goto", class_obscure, cmd_record_goto, _("\
- Restore the program to its state at instruction number N.\n\
- Argument is instruction number, as shown by 'info record'."),
- &record_goto_cmdlist, 1, &record_cmdlist);
- cmd_list_element *record_goto_begin_cmd
- = add_cmd ("begin", class_obscure, cmd_record_goto_begin,
- _("Go to the beginning of the execution log."),
- &record_goto_cmdlist);
- add_alias_cmd ("start", record_goto_begin_cmd, class_obscure, 1,
- &record_goto_cmdlist);
- add_cmd ("end", class_obscure, cmd_record_goto_end,
- _("Go to the end of the execution log."),
- &record_goto_cmdlist);
- add_cmd ("instruction-history", class_obscure, cmd_record_insn_history, _("\
- Print disassembled instructions stored in the execution log.\n\
- With a /m or /s modifier, source lines are included (if available).\n\
- With a /r modifier, raw instructions in hex are included.\n\
- With a /f modifier, function names are omitted.\n\
- With a /p modifier, current position markers are omitted.\n\
- With no argument, disassembles ten more instructions after the previous \
- disassembly.\n\
- \"record instruction-history -\" disassembles ten instructions before a \
- previous disassembly.\n\
- One argument specifies an instruction number as shown by 'info record', and \
- ten instructions are disassembled after that instruction.\n\
- Two arguments with comma between them specify starting and ending instruction \
- numbers to disassemble.\n\
- If the second argument is preceded by '+' or '-', it specifies the distance \
- from the first argument.\n\
- The number of instructions to disassemble can be defined with \"set record \
- instruction-history-size\"."),
- &record_cmdlist);
- add_cmd ("function-call-history", class_obscure, cmd_record_call_history, _("\
- Prints the execution history at function granularity.\n\
- It prints one line for each sequence of instructions that belong to the same \
- function.\n\
- Without modifiers, it prints the function name.\n\
- With a /l modifier, the source file and line number range is included.\n\
- With a /i modifier, the instruction number range is included.\n\
- With a /c modifier, the output is indented based on the call stack depth.\n\
- With no argument, prints ten more lines after the previous ten-line print.\n\
- \"record function-call-history -\" prints ten lines before a previous ten-line \
- print.\n\
- One argument specifies a function number as shown by 'info record', and \
- ten lines are printed after that function.\n\
- Two arguments with comma between them specify a range of functions to print.\n\
- If the second argument is preceded by '+' or '-', it specifies the distance \
- from the first argument.\n\
- The number of functions to print can be defined with \"set record \
- function-call-history-size\"."),
- &record_cmdlist);
- /* Sync command control variables. */
- record_insn_history_size_setshow_var = record_insn_history_size;
- record_call_history_size_setshow_var = record_call_history_size;
- }
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