2014-01-01 03:54:24 +00:00
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# Copyright 2013-2014 Free Software Foundation, Inc.
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GDB/MI: Add new "--language LANG" command option.
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.
2013-11-11 05:21:44 +00:00
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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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#
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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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#
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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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load_lib mi-support.exp
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set MIFLAGS "-i=mi"
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gdb_exit
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if [mi_gdb_start] {
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continue
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}
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2013-11-18 11:56:54 +00:00
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# First, verify that the debugger correctly advertises support
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# for the --language option.
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mi_gdb_test "-list-features" \
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"\\^done,features=\\\[.*\"language-option\".*\\\]" \
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"-list-features should include \"language-option\""
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GDB/MI: Add new "--language LANG" command option.
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.
2013-11-11 05:21:44 +00:00
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mi_gdb_test "set lang ada" \
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".*=cmd-param-changed,param=\"language\",value=\"ada\".*" \
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"set lang ada"
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# Evaluate an expression that the Ada language is unable to parse.
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mi_gdb_test "-data-evaluate-expression \"sizeof (void*)\"" \
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"\\^error,.*" \
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"sizeof expression using current language"
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# Now, ask for the same expression to be parsed, but using the C
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# language.
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mi_gdb_test "-data-evaluate-expression --language c \"sizeof (void*)\"" \
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"\\^done,value=\"$decimal\"" \
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"sizeof expression using C language"
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# Double-check that the current language has not changed.
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mi_gdb_test "show lang ada" \
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".*The current source language is \\\\\"ada\\\\\".*" \
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"set lang ada"
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# Test what happens when specifying an invalid language name...
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mi_gdb_test "-data-evaluate-expression --language invlang \"sizeof (void*)\"" \
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"\\^error,msg=\"Invalid --language argument: invlang\"" \
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"data-evaluate-expression with invalid language name"
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# Make sure that "--language auto" is also rejected.
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mi_gdb_test "-data-evaluate-expression --language auto \"sizeof (void*)\"" \
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"\\^error,msg=\"Invalid --language argument: auto\"" \
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"data-evaluate-expression with language auto"
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# Make sure that "--language local" is also rejected.
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mi_gdb_test "-data-evaluate-expression --language local \"sizeof (void*)\"" \
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"\\^error,msg=\"Invalid --language argument: local\"" \
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"data-evaluate-expression with language local"
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# Make sure that "--language unknown" is also rejected.
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mi_gdb_test "-data-evaluate-expression --language unknown \"sizeof (void*)\"" \
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"\\^error,msg=\"Invalid --language argument: unknown\"" \
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"data-evaluate-expression with language unknown"
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