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ANSI Common Lisp  9 Conditions 9.2 Dictionary of Conditions
| 9.2.22 invoke-debugger |
Function |
- Syntax:
-
invoke-debugger
condition
 |
- Arguments and Values:
-
condition - a condition object.
- Description:
-
invoke-debugger attempts to enter the debugger with condition.
If *debugger-hook* is not nil, it should be a function
(or the name of a function) to be called prior to entry to
the standard debugger. The function is called with
*debugger-hook* bound to nil, and the function
must accept two arguments: the condition
and the value of *debugger-hook* prior to binding it to nil.
If the function returns normally,
the standard debugger is entered.
The standard debugger never directly returns. Return can occur only by a
non-local transfer of control, such as the use of a restart function.
- Examples:
-
(ignore-errors ;Normally, this would suppress debugger entry
(handler-bind ((error #'invoke-debugger)) ;But this forces debugger entry
(error "Foo.")))
Debug: Foo.
To continue, type :CONTINUE followed by an option number:
1: Return to Lisp Toplevel.
Debug>
- Side Effects:
-
*debugger-hook* is bound to nil,
program execution is discontinued,
and the debugger is entered.
- Affected By:
-
*debug-io* and *debugger-hook*.
- See Also:
-
error, break
- Allegro CL Implementation Details:
-
None.
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