403cb6b138
Frontend sometimes need to evaluate expressions that are
language-specific. For instance, Eclipse uses the following
expression to determine the size of an address on the target:
-data-evaluate-expression "sizeof (void*)"
Unfortunately, if the main of the program being debugged is not C,
this may not work. For instance, if the main is in Ada, you get...
-data-evaluate-expression "sizeof (void*)"
^error,msg="No definition of \"sizeof\" in current context."
... and apparently decides to stop the debugging session as a result.
The recommendation sent was to specifically set the language to C
before trying to evaluate the expression. Something such as:
1. save current language
2. set language c
3. -data-evaluate-expression "sizeof (void*)"
4. Restore language
This has the same disadvantages as the ones outlined in the "Context
Management" section of the GDB/MI documentation regarding setting
the current thread or the current frame, thus recommending the use of
general command-line switches such as --frame, or --thread instead.
This patch follows the same steps for the language, adding a similar
new command option: --language LANG. Example of use:
-data-evaluate-expression --language c "sizeof (void*)"
^done,value="4"
gdb/ChangeLog:
* mi/mi-parse.h (struct mi_parse) <language>: New field.
* mi/mi-main.c (mi_cmd_execute): Temporarily set language to
PARSE->LANGUAGE during command execution, if set.
* mi/mi-parse.c: Add "language.h" #include.
(mi_parse): Add parsing of "--language" command option.
* NEWS: Add entry mentioning the new "--language" command option.
gdb/testsuite/ChangeLog:
* gdb.mi/mi-language.exp: New file.
gdb/doc/ChangeLog:
* gdb.texinfo (Show): Add xref anchor for "show language" command.
(Context management): Place current subsection text into its own
subsubsection. Add new subsubsection describing the "--language"
command option.
77 lines
2.3 KiB
C
77 lines
2.3 KiB
C
/* MI Command Set - MI Command Parser.
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Copyright (C) 2000-2013 Free Software Foundation, Inc.
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Contributed by Cygnus Solutions (a Red Hat company).
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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 MI_PARSE_H
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#define MI_PARSE_H
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#include <sys/time.h>
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/* MI parser */
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/* Timestamps for current command and last asynchronous command. */
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struct mi_timestamp {
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struct timeval wallclock;
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struct timeval utime;
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struct timeval stime;
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};
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enum mi_command_type
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{
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MI_COMMAND, CLI_COMMAND
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};
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struct mi_parse
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{
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enum mi_command_type op;
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char *command;
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char *token;
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const struct mi_cmd *cmd;
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struct mi_timestamp *cmd_start;
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char *args;
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char **argv;
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int argc;
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int all;
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int thread_group; /* At present, the same as inferior number. */
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int thread;
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int frame;
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/* The language that should be used to evaluate the MI command.
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Ignored if set to language_unknown. */
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enum language language;
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};
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/* Attempts to parse CMD returning a ``struct mi_parse''. If CMD is
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invalid, an exception is thrown. For an MI_COMMAND COMMAND, ARGS
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and OP are initialized. Un-initialized fields are zero. *TOKEN is
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set to the token, even if an exception is thrown. It is allocated
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with xmalloc; it must either be freed with xfree, or assigned to
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the TOKEN field of the resultant mi_parse object, to be freed by
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mi_parse_free. */
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extern struct mi_parse *mi_parse (const char *cmd, char **token);
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/* Free a command returned by mi_parse_command. */
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extern void mi_parse_free (struct mi_parse *cmd);
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/* Parse a string argument into a print_values value. */
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enum print_values mi_parse_print_values (const char *name);
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#endif
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