From 2ea126fa785cf0d2b26cdba5c6ad8b8548b7ef15 Mon Sep 17 00:00:00 2001 From: Joel Brobecker Date: Mon, 18 Nov 2013 16:55:16 +0400 Subject: Add "undefined-command" error code at end of ^error result... ... when trying to execute an undefined GDB/MI command. When trying to execute a GDB/MI command which does not exist, the current error result record looks like this: -unsupported ^error,msg="Undefined MI command: unsupported" The only indication that the command does not exist is the error message. It would be a little fragile for a consumer to rely solely on the contents of the error message in order to determine whether a command exists or not. This patch improves the situation by adding concept of error code, starting with one well-defined error code ("undefined-command") identifying errors due to a non-existant command. Here is the new output: -unsupported ^error,msg="Undefined MI command: unsupported",code="undefined-command" This error code is only displayed when the corresponding error condition is met. Otherwise, the error record remains unchanged. For instance: -symbol-list-lines foo.adb ^error,msg="-symbol-list-lines: Unknown source file name." For frontends to be able to know whether they can rely on this variable, a new entry "undefined-command-error-code" has been added to the "-list-features" command. Another option would be to always generate an error="..." variable (for the default case, we could decide for instance that the error code is the empty string). But it seems more efficient to provide that info in "-list-features" and then only add the error code when meaningful. gdb/ChangeLog: (from Pedro Alves ) (from Joel Brobecker ) * exceptions.h (enum_errors) : New enum. * mi/mi-parse.c (mi_parse): Throw UNDEFINED_COMMAND_ERROR instead of a regular error when the GDB/MI command does not exist. * mi/mi-main.c (mi_cmd_list_features): Add "undefined-command-error-code". (mi_print_exception): Print an "undefined-command" error code if EXCEPTION.ERROR is UNDEFINED_COMMAND_ERROR. * NEWS: Add entry documenting the new "code" variable in "^error" result records. gdb/doc/ChangeLog: * gdb.texinfo (GDB/MI Result Records): Fix the syntax of the "^error" result record concerning the error message. Document the error code that may also be part of that result record. (GDB/MI Miscellaneous Commands): Document the "undefined-command-error-code" element in the output of the "-list-features" GDB/MI command. gdb/testsuite/ChangeLog: * gdb.mi/mi-undefined-cmd.exp: New testcase. --- gdb/mi/mi-main.c | 12 +++++++++++- gdb/mi/mi-parse.c | 3 ++- 2 files changed, 13 insertions(+), 2 deletions(-) (limited to 'gdb/mi') diff --git a/gdb/mi/mi-main.c b/gdb/mi/mi-main.c index 48c8d09..3a0e6a8 100644 --- a/gdb/mi/mi-main.c +++ b/gdb/mi/mi-main.c @@ -1818,6 +1818,7 @@ mi_cmd_list_features (char *command, char **argv, int argc) ui_out_field_string (uiout, NULL, "ada-exceptions"); ui_out_field_string (uiout, NULL, "language-option"); ui_out_field_string (uiout, NULL, "info-gdb-mi-command"); + ui_out_field_string (uiout, NULL, "undefined-command-error-code"); #if HAVE_PYTHON if (gdb_python_initialized) @@ -2023,7 +2024,16 @@ mi_print_exception (const char *token, struct gdb_exception exception) fputs_unfiltered ("unknown error", raw_stdout); else fputstr_unfiltered (exception.message, '"', raw_stdout); - fputs_unfiltered ("\"\n", raw_stdout); + fputs_unfiltered ("\"", raw_stdout); + + switch (exception.error) + { + case UNDEFINED_COMMAND_ERROR: + fputs_unfiltered (",code=\"undefined-command\"", raw_stdout); + break; + } + + fputs_unfiltered ("\n", raw_stdout); } void diff --git a/gdb/mi/mi-parse.c b/gdb/mi/mi-parse.c index a2634f1..a092759 100644 --- a/gdb/mi/mi-parse.c +++ b/gdb/mi/mi-parse.c @@ -285,7 +285,8 @@ mi_parse (const char *cmd, char **token) /* Find the command in the MI table. */ parse->cmd = mi_lookup (parse->command); if (parse->cmd == NULL) - error (_("Undefined MI command: %s"), parse->command); + throw_error (UNDEFINED_COMMAND_ERROR, + _("Undefined MI command: %s"), parse->command); /* Skip white space following the command. */ chp = skip_spaces_const (chp); -- cgit v1.1