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(gdb.info)GDB/MI Output Syntax

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GDB/MI Output Syntax
--------------------

   The output from GDB/MI consists of zero or more out-of-band records
followed, optionally, by a single result record.  This result record is
for the most recent command.  The sequence of output records is
terminated by `(gdb)'.

   If an input command was prefixed with a `TOKEN' then the
corresponding output for that command will also be prefixed by that same
TOKEN.

`OUTPUT ==>'
     `( OUT-OF-BAND-RECORD )* [ RESULT-RECORD ] "(gdb)" NL'

`RESULT-RECORD ==>'
     ` [ TOKEN ] "^" RESULT-CLASS ( "," RESULT )* NL'

`OUT-OF-BAND-RECORD ==>'
     `ASYNC-RECORD | STREAM-RECORD'

`ASYNC-RECORD ==>'
     `EXEC-ASYNC-OUTPUT | STATUS-ASYNC-OUTPUT | NOTIFY-ASYNC-OUTPUT'

`EXEC-ASYNC-OUTPUT ==>'
     `[ TOKEN ] "*" ASYNC-OUTPUT'

`STATUS-ASYNC-OUTPUT ==>'
     `[ TOKEN ] "+" ASYNC-OUTPUT'

`NOTIFY-ASYNC-OUTPUT ==>'
     `[ TOKEN ] "=" ASYNC-OUTPUT'

`ASYNC-OUTPUT ==>'
     `ASYNC-CLASS ( "," RESULT )* NL'

`RESULT-CLASS ==>'
     `"done" | "running" | "connected" | "error" | "exit"'

`ASYNC-CLASS ==>'
     `"stopped" | OTHERS' (where OTHERS will be added depending on the
     needs--this is still in development).

`RESULT ==>'
     ` VARIABLE "=" VALUE'

`VARIABLE ==>'
     ` STRING '

`VALUE ==>'
     ` CONST | TUPLE | LIST '

`CONST ==>'
     `C-STRING'

`TUPLE ==>'
     ` "{}" | "{" RESULT ( "," RESULT )* "}" '

`LIST ==>'
     ` "[]" | "[" VALUE ( "," VALUE )* "]" | "[" RESULT ( "," RESULT )*
     "]" '

`STREAM-RECORD ==>'
     `CONSOLE-STREAM-OUTPUT | TARGET-STREAM-OUTPUT | LOG-STREAM-OUTPUT'

`CONSOLE-STREAM-OUTPUT ==>'
     `"~" C-STRING'

`TARGET-STREAM-OUTPUT ==>'
     `"@" C-STRING'

`LOG-STREAM-OUTPUT ==>'
     `"&" C-STRING'

`NL ==>'
     `CR | CR-LF'

`TOKEN ==>'
     _any sequence of digits_.

Notes:

   * All output sequences end in a single line containing a period.

   * The `TOKEN' is from the corresponding request.  If an execution
     command is interrupted by the `-exec-interrupt' command, the TOKEN
     associated with the `*stopped' message is the one of the original
     execution command, not the one of the interrupt command.

   * STATUS-ASYNC-OUTPUT contains on-going status information about the
     progress of a slow operation.  It can be discarded.  All status
     output is prefixed by `+'.

   * EXEC-ASYNC-OUTPUT contains asynchronous state change on the target
     (stopped, started, disappeared).  All async output is prefixed by
     `*'.

   * NOTIFY-ASYNC-OUTPUT contains supplementary information that the
     client should handle (e.g., a new breakpoint information).  All
     notify output is prefixed by `='.

   * CONSOLE-STREAM-OUTPUT is output that should be displayed as is in
     the console.  It is the textual response to a CLI command.  All
     the console output is prefixed by `~'.

   * TARGET-STREAM-OUTPUT is the output produced by the target program.
     All the target output is prefixed by `@'.

   * LOG-STREAM-OUTPUT is output text coming from GDB's internals, for
     instance messages that should be displayed as part of an error
     log.  All the log output is prefixed by `&'.

   * New GDB/MI commands should only output LISTS containing VALUES.


   Note: GDB/MI Stream Records, for more details
about the various output records.