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18.2.16 Edebug Options

These options affect the behavior of Edebug:

user option edebug-setup-hook

Functions to call before Edebug is used. Each time it is set to a new value, Edebug will call those functions once and then reset edebug-setup-hook to nil. You could use this to load up Edebug specifications associated with a package you are using, but only when you also use Edebug. See Instrumenting.

user option edebug-all-defs

If this is non-nil, normal evaluation of defining forms such as defun and defmacro instruments them for Edebug. This applies to eval-defun, eval-region, eval-buffer, and eval-current-buffer.

Use the command M-x edebug-all-defs to toggle the value of this option. See Instrumenting.

user option edebug-all-forms

If this is non-nil, the commands eval-defun, eval-region, eval-buffer, and eval-current-buffer instrument all forms, even those that don’t define anything. This doesn’t apply to loading or evaluations in the minibuffer.

Use the command M-x edebug-all-forms to toggle the value of this option. See Instrumenting.

user option edebug-eval-macro-args

When this is non-nil, all macro arguments will be instrumented in the generated code. For any macro, an edebug-form-spec overrides this option. So to specify exceptions for macros that have some arguments evaluated and some not, use def-edebug-spec to specify an edebug-form-spec.

user option edebug-save-windows

If this is non-nil, Edebug saves and restores the window configuration. That takes some time, so if your program does not care what happens to the window configurations, it is better to set this variable to nil.

If the value is a list, only the listed windows are saved and restored.

You can use the W command in Edebug to change this variable interactively. See Edebug Display Update.

user option edebug-save-displayed-buffer-points

If this is non-nil, Edebug saves and restores point in all displayed buffers.

Saving and restoring point in other buffers is necessary if you are debugging code that changes the point of a buffer that is displayed in a non-selected window. If Edebug or the user then selects the window, point in that buffer will move to the window’s value of point.

Saving and restoring point in all buffers is expensive, since it requires selecting each window twice, so enable this only if you need it. See Edebug Display Update.

user option edebug-initial-mode

If this variable is non-nil, it specifies the initial execution mode for Edebug when it is first activated. Possible values are step, next, go, Go-nonstop, trace, Trace-fast, continue, and Continue-fast.

The default value is step. This variable can be set interactively with C-x C-a C-m (edebug-set-initial-mode). See Edebug Execution Modes.

user option edebug-trace

If this is non-nil, trace each function entry and exit. Tracing output is displayed in a buffer named *edebug-trace*, one function entry or exit per line, indented by the recursion level.

Also see edebug-tracing, in Trace Buffer.

user option edebug-test-coverage

If non-nil, Edebug tests coverage of all expressions debugged. See Coverage Testing.

user option edebug-continue-kbd-macro

If non-nil, continue defining or executing any keyboard macro that is executing outside of Edebug. Use this with caution since it is not debugged. See Edebug Execution Modes.

user option edebug-print-length

If non-nil, the default value of print-length for printing results in Edebug. See Output Variables.

user option edebug-print-level

If non-nil, the default value of print-level for printing results in Edebug. See Output Variables.

user option edebug-print-circle

If non-nil, the default value of print-circle for printing results in Edebug. See Output Variables.

user option edebug-unwrap-results

If non-nil, Edebug tries to remove any of its own instrumentation when showing the results of expressions. This is relevant when debugging macros where the results of expressions are themselves instrumented expressions. As a very artificial example, suppose that the example function fac has been instrumented, and consider a macro of the form:

(defmacro test () "Edebug example."
(if (symbol-function 'fac)

If you instrument the test macro and step through it, then by default the result of the symbol-function call has numerous edebug-after and edebug-before forms, which can make it difficult to see the actual result. If edebug-unwrap-results is non-nil, Edebug tries to remove these forms from the result.

user option edebug-on-error

Edebug binds debug-on-error to this value, if debug-on-error was previously nil. See Trapping Errors.

user option edebug-on-quit

Edebug binds debug-on-quit to this value, if debug-on-quit was previously nil. See Trapping Errors.

If you change the values of edebug-on-error or edebug-on-quit while Edebug is active, their values won’t be used until the next time Edebug is invoked via a new command.

user option edebug-global-break-condition

If non-nil, an expression to test for at every stop point. If the result is non-nil, then break. Errors are ignored. See Global Break Condition.

user option edebug-sit-for-seconds

Number of seconds to pause when a breakpoint is reached and the execution mode is trace or continue. See Edebug Execution Modes.

user option edebug-sit-on-break

Whether or not to pause for edebug-sit-for-seconds on reaching a breakpoint. Set to nil to prevent the pause, non-nil to allow it.

user option edebug-behavior-alist

By default, this alist contains one entry with the key edebug and a list of three functions, which are the default implementations of the functions inserted in instrumented code: edebug-enter, edebug-before and edebug-after. To change Edebug’s behavior globally, modify the default entry.

Edebug’s behavior may also be changed on a per-definition basis by adding an entry to this alist, with a key of your choice and three functions. Then set the edebug-behavior symbol property of an instrumented definition to the key of the new entry, and Edebug will call the new functions in place of its own for that definition.

user option edebug-new-definition-function

A function run by Edebug after it wraps the body of a definition or closure. After Edebug has initialized its own data, this function is called with one argument, the symbol associated with the definition, which may be the actual symbol defined or one generated by Edebug. This function may be used to set the edebug-behavior symbol property of each definition instrumented by Edebug.

user option edebug-after-instrumentation-function

To inspect or modify Edebug’s instrumentation before it is used, set this variable to a function which takes one argument, an instrumented top-level form, and returns either the same or a replacement form, which Edebug will then use as the final result of instrumentation.