Guile Commands (Debugging with GDB)

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#### 23.4.2 Guile Commands

GDB provides two commands for accessing the Guile interpreter:

`guile-repl`
`gr`

  The `guile-repl` command can be used to start an interactive Guile prompt or repl. To return to GDB, type `,q` or the `EOF` character (e.g., `Ctrl-D` on an empty prompt). These commands do not take any arguments.

`guile [scheme-expression]`
`gu [scheme-expression]`

  The `guile` command can be used to evaluate a Scheme expression.

  If given an argument, GDB will pass the argument to the Guile interpreter for evaluation.

      (gdb) guile (display (+ 20 3)) (newline)
      23

  The result of the Scheme expression is displayed using normal Guile rules.

      (gdb) guile (+ 20 3)
      23

  If you do not provide an argument to `guile`, it will act as a multi-line command, like `define`. In this case, the Guile script is made up of subsequent command lines, given after the `guile` command. This command list is terminated using a line containing `end`. For example:

      (gdb) guile
      >(display 23)
      >(newline)
      >end
      23

It is also possible to execute a Guile script from the GDB interpreter:

`source `script-name``

  The script name must end with ‘`.scm`’ and GDB must be configured to recognize the script language based on filename extension using the `script-extension` setting. See Extending GDB.

`guile (load "script-name")`

  This method uses the `load` Guile function. It takes a string argument that is the name of the script to load. See the Guile documentation for a description of this function. (see Loading in GNU Guile Reference Manual).

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