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binutils-gdb/gdb/mi/mi-cmds.c
Andrew Burgess 30056ea04a gdb/mi: New commands to catch C++ exceptions 
Adds some MI commands to catch C++ exceptions.  The new commands are
-catch-throw, -catch-rethrow, and -catch-catch, these all correspond
to the CLI commands 'catch throw', 'catch rethrow', and 'catch catch'.

Each MI command takes two optional arguments, '-t' has the effect of
calling 'tcatch' instead of 'catch', for example:

   (gdb)
   -catch-throw -t

Is the same as:

   (gdb) tcatch throw

There is also a '-r REGEXP' argument that can supply a regexp to match
against the exception type, so:

   (gdb)
   -catch-catch -r PATTERN

Is the same as:

   (gdb) catch catch PATTERN

The change in print_mention_exception_catchpoint might seem a little
strange; changing the output from using ui_out::field_int and
ui_out::text to using  ui_out::message.

The print_mention_exception_catchpoint is used as the 'print_mention'
method for the exception catchpoint breakpoint object.  Most of the
other 'print_mention' methods (see breakpoint.c) use either
printf_filtered, of ui_out::message.  Using field_int was causing an
unexpected field to be added to the MI output.  Here's the output
without the change in print_mention_exception_catchpoint:

    (gdb)
    -catch-throw
    ^done,bkptno="1",bkpt={number="1",type="breakpoint",disp="keep",
                           enabled="y",addr="0x00000000004006c0",
                           what="exception throw",catch-type="throw",
                           thread-groups=["i1"],times="0"}

Notice the breakpoint number appears in both the 'bkptno' field, and
the 'number' field within the 'bkpt' tuple.  Here's the output with
the change in print_mention_exception_catchpoint:

    (gdb)
    -catch-throw
    ^done,bkpt={number="1",type="breakpoint",disp="keep",
                enabled="y",addr="0x00000000004006c0",
                what="exception throw",catch-type="throw",
                thread-groups=["i1"],times="0"}

gdb/ChangeLog:

	* NEWS: Mention new MI commands.
	* break-catch-throw.c (enum exception_event_kind): Move to
	breakpoint.h.
	(print_mention_exception_catchpoint): Output text as a single
	message.
	(catch_exception_command_1): Rename to...
	(catch_exception_event): ...this, make non-static, update header
	command, and change some parameter types.
	(catch_catch_command): Update for changes to
	catch_exception_command_1.
	(catch_throw_command): Likewise.
	(catch_rethrow_command): Likewise.
	* breakpoint.c (enum exception_event_kind): Delete.
	* breakpoint.h (enum exception_event_kind): Moved here from
	break-catch-throw.c.
	(catch_exception_event): Declare.
	* mi/mi-cmd-catch.c (mi_cmd_catch_exception_event): New function.
	(mi_cmd_catch_throw): New function.
	(mi_cmd_catch_rethrow): New function.
	(mi_cmd_catch_catch): New function.
	* mi/mi-cmds.c (mi_cmds): Add 'catch-throw', 'catch-rethrow', and
	'catch-catch' entries.
	* mi/mi-cmds.h (mi_cmd_catch_throw): Declare.
	(mi_cmd_catch_rethrow): Declare.
	(mi_cmd_catch_catch): Declare.

gdb/doc/ChangeLog:

	* gdb.texinfo (GDB/MI Catchpoint Commands): Add menu entry to new
	node.
	(C++ Exception GDB/MI Catchpoint Commands): New node to describe
	new MI commands.

gdb/testsuite/ChangeLog:

	* gdb.mi/mi-catch-cpp-exceptions.cc: New file.
	* gdb.mi/mi-catch-cpp-exceptions.exp: New file.
	* lib/mi-support.exp (mi_expect_stop): Handle 'exception-caught'
	as a stop reason.
2019-06-15 23:22:22 +01:00

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/* MI Command Set for GDB, the GNU debugger.
Copyright (C) 2000-2019 Free Software Foundation, Inc.
Contributed by Cygnus Solutions (a Red Hat company).
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 "top.h"
#include "mi-cmds.h"
#include "mi-main.h"
struct mi_cmd;
static struct mi_cmd **lookup_table (const char *command);
static void build_table (struct mi_cmd *commands);
static struct mi_cmd mi_cmds[] =
{
/* Define a MI command of NAME, and its corresponding CLI command is
CLI_NAME. */
#define DEF_MI_CMD_CLI_1(NAME, CLI_NAME, ARGS_P, CALLED) \
{ NAME, { CLI_NAME, ARGS_P}, NULL, CALLED }
#define DEF_MI_CMD_CLI(NAME, CLI_NAME, ARGS_P) \
DEF_MI_CMD_CLI_1(NAME, CLI_NAME, ARGS_P, NULL)
/* Define a MI command of NAME, and implemented by function MI_FUNC. */
#define DEF_MI_CMD_MI_1(NAME, MI_FUNC, CALLED) \
{ NAME, {NULL, 0}, MI_FUNC, CALLED }
#define DEF_MI_CMD_MI(NAME, MI_FUNC) DEF_MI_CMD_MI_1(NAME, MI_FUNC, NULL)
DEF_MI_CMD_MI ("ada-task-info", mi_cmd_ada_task_info),
DEF_MI_CMD_MI ("add-inferior", mi_cmd_add_inferior),
DEF_MI_CMD_CLI_1 ("break-after", "ignore", 1,
&mi_suppress_notification.breakpoint),
DEF_MI_CMD_CLI_1 ("break-condition","cond", 1,
&mi_suppress_notification.breakpoint),
DEF_MI_CMD_MI_1 ("break-commands", mi_cmd_break_commands,
&mi_suppress_notification.breakpoint),
DEF_MI_CMD_CLI_1 ("break-delete", "delete breakpoint", 1,
&mi_suppress_notification.breakpoint),
DEF_MI_CMD_CLI_1 ("break-disable", "disable breakpoint", 1,
&mi_suppress_notification.breakpoint),
DEF_MI_CMD_CLI_1 ("break-enable", "enable breakpoint", 1,
&mi_suppress_notification.breakpoint),
DEF_MI_CMD_CLI ("break-info", "info break", 1),
DEF_MI_CMD_MI_1 ("break-insert", mi_cmd_break_insert,
&mi_suppress_notification.breakpoint),
DEF_MI_CMD_MI_1 ("dprintf-insert", mi_cmd_dprintf_insert,
&mi_suppress_notification.breakpoint),
DEF_MI_CMD_CLI ("break-list", "info break", 0),
DEF_MI_CMD_MI_1 ("break-passcount", mi_cmd_break_passcount,
&mi_suppress_notification.breakpoint),
DEF_MI_CMD_MI_1 ("break-watch", mi_cmd_break_watch,
&mi_suppress_notification.breakpoint),
DEF_MI_CMD_MI_1 ("catch-assert", mi_cmd_catch_assert,
&mi_suppress_notification.breakpoint),
DEF_MI_CMD_MI_1 ("catch-exception", mi_cmd_catch_exception,
&mi_suppress_notification.breakpoint),
DEF_MI_CMD_MI_1 ("catch-handlers", mi_cmd_catch_handlers,
&mi_suppress_notification.breakpoint),
DEF_MI_CMD_MI_1 ("catch-load", mi_cmd_catch_load,
&mi_suppress_notification.breakpoint),
DEF_MI_CMD_MI_1 ("catch-unload", mi_cmd_catch_unload,
&mi_suppress_notification.breakpoint),
DEF_MI_CMD_MI_1 ("catch-throw", mi_cmd_catch_throw,
&mi_suppress_notification.breakpoint),
DEF_MI_CMD_MI_1 ("catch-rethrow", mi_cmd_catch_rethrow,
&mi_suppress_notification.breakpoint),
DEF_MI_CMD_MI_1 ("catch-catch", mi_cmd_catch_catch,
&mi_suppress_notification.breakpoint),
DEF_MI_CMD_MI ("complete", mi_cmd_complete),
DEF_MI_CMD_MI ("data-disassemble", mi_cmd_disassemble),
DEF_MI_CMD_MI ("data-evaluate-expression", mi_cmd_data_evaluate_expression),
DEF_MI_CMD_MI ("data-list-changed-registers",
mi_cmd_data_list_changed_registers),
DEF_MI_CMD_MI ("data-list-register-names", mi_cmd_data_list_register_names),
DEF_MI_CMD_MI ("data-list-register-values", mi_cmd_data_list_register_values),
DEF_MI_CMD_MI ("data-read-memory", mi_cmd_data_read_memory),
DEF_MI_CMD_MI ("data-read-memory-bytes", mi_cmd_data_read_memory_bytes),
DEF_MI_CMD_MI_1 ("data-write-memory", mi_cmd_data_write_memory,
&mi_suppress_notification.memory),
DEF_MI_CMD_MI_1 ("data-write-memory-bytes", mi_cmd_data_write_memory_bytes,
&mi_suppress_notification.memory),
DEF_MI_CMD_MI ("data-write-register-values",
mi_cmd_data_write_register_values),
DEF_MI_CMD_MI ("enable-timings", mi_cmd_enable_timings),
DEF_MI_CMD_MI ("enable-pretty-printing", mi_cmd_enable_pretty_printing),
DEF_MI_CMD_MI ("enable-frame-filters", mi_cmd_enable_frame_filters),
DEF_MI_CMD_MI ("environment-cd", mi_cmd_env_cd),
DEF_MI_CMD_MI ("environment-directory", mi_cmd_env_dir),
DEF_MI_CMD_MI ("environment-path", mi_cmd_env_path),
DEF_MI_CMD_MI ("environment-pwd", mi_cmd_env_pwd),
DEF_MI_CMD_CLI_1 ("exec-arguments", "set args", 1,
&mi_suppress_notification.cmd_param_changed),
DEF_MI_CMD_MI ("exec-continue", mi_cmd_exec_continue),
DEF_MI_CMD_MI ("exec-finish", mi_cmd_exec_finish),
DEF_MI_CMD_MI ("exec-jump", mi_cmd_exec_jump),
DEF_MI_CMD_MI ("exec-interrupt", mi_cmd_exec_interrupt),
DEF_MI_CMD_MI ("exec-next", mi_cmd_exec_next),
DEF_MI_CMD_MI ("exec-next-instruction", mi_cmd_exec_next_instruction),
DEF_MI_CMD_MI ("exec-return", mi_cmd_exec_return),
DEF_MI_CMD_MI ("exec-run", mi_cmd_exec_run),
DEF_MI_CMD_MI ("exec-step", mi_cmd_exec_step),
DEF_MI_CMD_MI ("exec-step-instruction", mi_cmd_exec_step_instruction),
DEF_MI_CMD_CLI ("exec-until", "until", 1),
DEF_MI_CMD_CLI ("file-exec-and-symbols", "file", 1),
DEF_MI_CMD_CLI ("file-exec-file", "exec-file", 1),
DEF_MI_CMD_MI ("file-list-exec-source-file",
mi_cmd_file_list_exec_source_file),
DEF_MI_CMD_MI ("file-list-exec-source-files",
mi_cmd_file_list_exec_source_files),
DEF_MI_CMD_MI ("file-list-shared-libraries",
mi_cmd_file_list_shared_libraries),
DEF_MI_CMD_CLI ("file-symbol-file", "symbol-file", 1),
DEF_MI_CMD_MI ("fix-multi-location-breakpoint-output",
mi_cmd_fix_multi_location_breakpoint_output),
DEF_MI_CMD_MI ("gdb-exit", mi_cmd_gdb_exit),
DEF_MI_CMD_CLI_1 ("gdb-set", "set", 1,
&mi_suppress_notification.cmd_param_changed),
DEF_MI_CMD_CLI ("gdb-show", "show", 1),
DEF_MI_CMD_CLI ("gdb-version", "show version", 0),
DEF_MI_CMD_MI ("inferior-tty-set", mi_cmd_inferior_tty_set),
DEF_MI_CMD_MI ("inferior-tty-show", mi_cmd_inferior_tty_show),
DEF_MI_CMD_MI ("info-ada-exceptions", mi_cmd_info_ada_exceptions),
DEF_MI_CMD_MI ("info-gdb-mi-command", mi_cmd_info_gdb_mi_command),
DEF_MI_CMD_MI ("info-os", mi_cmd_info_os),
DEF_MI_CMD_MI ("interpreter-exec", mi_cmd_interpreter_exec),
DEF_MI_CMD_MI ("list-features", mi_cmd_list_features),
DEF_MI_CMD_MI ("list-target-features", mi_cmd_list_target_features),
DEF_MI_CMD_MI ("list-thread-groups", mi_cmd_list_thread_groups),
DEF_MI_CMD_MI ("remove-inferior", mi_cmd_remove_inferior),
DEF_MI_CMD_MI ("stack-info-depth", mi_cmd_stack_info_depth),
DEF_MI_CMD_MI ("stack-info-frame", mi_cmd_stack_info_frame),
DEF_MI_CMD_MI ("stack-list-arguments", mi_cmd_stack_list_args),
DEF_MI_CMD_MI ("stack-list-frames", mi_cmd_stack_list_frames),
DEF_MI_CMD_MI ("stack-list-locals", mi_cmd_stack_list_locals),
DEF_MI_CMD_MI ("stack-list-variables", mi_cmd_stack_list_variables),
DEF_MI_CMD_MI_1 ("stack-select-frame", mi_cmd_stack_select_frame,
&mi_suppress_notification.user_selected_context),
DEF_MI_CMD_MI ("symbol-list-lines", mi_cmd_symbol_list_lines),
DEF_MI_CMD_CLI ("target-attach", "attach", 1),
DEF_MI_CMD_MI ("target-detach", mi_cmd_target_detach),
DEF_MI_CMD_CLI ("target-disconnect", "disconnect", 0),
DEF_MI_CMD_CLI ("target-download", "load", 1),
DEF_MI_CMD_MI ("target-file-delete", mi_cmd_target_file_delete),
DEF_MI_CMD_MI ("target-file-get", mi_cmd_target_file_get),
DEF_MI_CMD_MI ("target-file-put", mi_cmd_target_file_put),
DEF_MI_CMD_MI ("target-flash-erase", mi_cmd_target_flash_erase),
DEF_MI_CMD_CLI ("target-select", "target", 1),
DEF_MI_CMD_MI ("thread-info", mi_cmd_thread_info),
DEF_MI_CMD_MI ("thread-list-ids", mi_cmd_thread_list_ids),
DEF_MI_CMD_MI_1 ("thread-select", mi_cmd_thread_select,
&mi_suppress_notification.user_selected_context),
DEF_MI_CMD_MI ("trace-define-variable", mi_cmd_trace_define_variable),
DEF_MI_CMD_MI_1 ("trace-find", mi_cmd_trace_find,
&mi_suppress_notification.traceframe),
DEF_MI_CMD_MI ("trace-frame-collected",
mi_cmd_trace_frame_collected),
DEF_MI_CMD_MI ("trace-list-variables", mi_cmd_trace_list_variables),
DEF_MI_CMD_MI ("trace-save", mi_cmd_trace_save),
DEF_MI_CMD_MI ("trace-start", mi_cmd_trace_start),
DEF_MI_CMD_MI ("trace-status", mi_cmd_trace_status),
DEF_MI_CMD_MI ("trace-stop", mi_cmd_trace_stop),
DEF_MI_CMD_MI ("var-assign", mi_cmd_var_assign),
DEF_MI_CMD_MI ("var-create", mi_cmd_var_create),
DEF_MI_CMD_MI ("var-delete", mi_cmd_var_delete),
DEF_MI_CMD_MI ("var-evaluate-expression", mi_cmd_var_evaluate_expression),
DEF_MI_CMD_MI ("var-info-path-expression", mi_cmd_var_info_path_expression),
DEF_MI_CMD_MI ("var-info-expression", mi_cmd_var_info_expression),
DEF_MI_CMD_MI ("var-info-num-children", mi_cmd_var_info_num_children),
DEF_MI_CMD_MI ("var-info-type", mi_cmd_var_info_type),
DEF_MI_CMD_MI ("var-list-children", mi_cmd_var_list_children),
DEF_MI_CMD_MI ("var-set-format", mi_cmd_var_set_format),
DEF_MI_CMD_MI ("var-set-frozen", mi_cmd_var_set_frozen),
DEF_MI_CMD_MI ("var-set-update-range", mi_cmd_var_set_update_range),
DEF_MI_CMD_MI ("var-set-visualizer", mi_cmd_var_set_visualizer),
DEF_MI_CMD_MI ("var-show-attributes", mi_cmd_var_show_attributes),
DEF_MI_CMD_MI ("var-show-format", mi_cmd_var_show_format),
DEF_MI_CMD_MI ("var-update", mi_cmd_var_update),
{ NULL, }
};
/* Pointer to the mi command table (built at run time). */
static struct mi_cmd **mi_table;
/* A prime large enough to accomodate the entire command table. */
enum
{
MI_TABLE_SIZE = 227
};
/* Exported function used to obtain info from the table. */
struct mi_cmd *
mi_lookup (const char *command)
{
return *lookup_table (command);
}
/* Used for collecting hash hit/miss statistics. */
struct mi_cmd_stats
{
int hit;
int miss;
int rehash;
};
struct mi_cmd_stats stats;
/* Look up a command. */
static struct mi_cmd **
lookup_table (const char *command)
{
const char *chp;
unsigned int index = 0;
/* Compute our hash. */
for (chp = command; *chp; chp++)
{
/* We use a somewhat arbitrary formula. */
index = ((index << 6) + (unsigned int) *chp) % MI_TABLE_SIZE;
}
while (1)
{
struct mi_cmd **entry = &mi_table[index];
if ((*entry) == 0)
{
/* not found, return pointer to next free. */
stats.miss++;
return entry;
}
if (strcmp (command, (*entry)->name) == 0)
{
stats.hit++;
return entry; /* found */
}
index = (index + 1) % MI_TABLE_SIZE;
stats.rehash++;
}
}
static void
build_table (struct mi_cmd *commands)
{
int nr_rehash = 0;
int nr_entries = 0;
struct mi_cmd *command;
mi_table = XCNEWVEC (struct mi_cmd *, MI_TABLE_SIZE);
for (command = commands; command->name != 0; command++)
{
struct mi_cmd **entry = lookup_table (command->name);
if (*entry)
internal_error (__FILE__, __LINE__,
_("command `%s' appears to be duplicated"),
command->name);
*entry = command;
/* FIXME lose these prints */
if (0)
{
fprintf_unfiltered (gdb_stdlog, "%-30s %2d\n",
command->name, stats.rehash - nr_rehash);
}
nr_entries++;
nr_rehash = stats.rehash;
}
if (0)
{
fprintf_filtered (gdb_stdlog, "Average %3.1f\n",
(double) nr_rehash / (double) nr_entries);
}
}
void
_initialize_mi_cmds (void)
{
build_table (mi_cmds);
memset (&stats, 0, sizeof (stats));
}
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