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(define-module (ice-9 debugging ice-9-debugger-extensions)
#:use-module (ice-9 debugger))
;;; Upgrade the debugger state object so that it can carry a flag
;;; indicating whether the debugging session is continuable.
(use-modules (ice-9 debugger state))
(define-module (ice-9 debugger state))
(set! state-rtd (make-record-type "debugger-state" '(stack index flags)))
(set! state? (record-predicate state-rtd))
(set! make-state
(let ((make-state-internal (record-constructor state-rtd
'(stack index flags))))
(lambda (stack index . flags)
(make-state-internal stack index flags))))
(set! state-stack (record-accessor state-rtd 'stack))
(set! state-index (record-accessor state-rtd 'index))
(define state-flags (record-accessor state-rtd 'flags))
;;; Add commands that (ice-9 debugger) doesn't currently have, for
;;; continuing or single stepping program execution.
(use-modules (ice-9 debugger command-loop))
(define-module (ice-9 debugger command-loop)
#:use-module (ice-9 debugger)
#:use-module (ice-9 debugger state)
#:use-module (ice-9 debugging traps))
(define new-define-command define-command)
(set! define-command
(lambda (name argument-template documentation procedure)
(new-define-command name argument-template procedure)))
(use-modules (ice-9 debugging steps))
(define (assert-continuable state)
;; Check that debugger is in a state where `continuing' makes sense.
;; If not, signal an error.
(or (memq #:continuable (state-flags state))
(user-error "This debug session is not continuable.")))
(define (debugger:continue state)
"Tell the program being debugged to continue running. (In fact this is
the same as the @code{quit} command, because it exits the debugger
command loop and so allows whatever code it was that invoked the
debugger to continue.)"
(assert-continuable state)
(throw 'exit-debugger))
(define (debugger:finish state)
"Continue until evaluation of the current frame is complete, and
print the result obtained."
(assert-continuable state)
(at-exit (- (stack-length (state-stack state))
(state-index state))
(list trace-trap debug-trap))
(debugger:continue state))
(define (debugger:step state n)
"Tell the debugged program to do @var{n} more steps from its current
position. One @dfn{step} means executing until the next frame entry
or exit of any kind. @var{n} defaults to 1."
(assert-continuable state)
(at-step debug-trap (or n 1))
(debugger:continue state))
(define (debugger:next state n)
"Tell the debugged program to do @var{n} more steps from its current
position, but only counting frame entries and exits where the
corresponding source code comes from the same file as the current
stack frame. (See @ref{Step Traps} for the details of how this
works.) If the current stack frame has no source code, the effect of
this command is the same as of @code{step}. @var{n} defaults to 1."
(assert-continuable state)
(at-step debug-trap
(or n 1)
(frame-file-name (stack-ref (state-stack state)
(state-index state)))
(if (memq #:return (state-flags state))
#f
(- (stack-length (state-stack state)) (state-index state))))
(debugger:continue state))
(define-command "continue" '()
"Continue program execution."
debugger:continue)
(define-command "finish" '()
"Continue until evaluation of the current frame is complete, and
print the result obtained."
debugger:finish)
(define-command "step" '('optional exact-integer)
"Continue until entry to @var{n}th next frame."
debugger:step)
(define-command "next" '('optional exact-integer)
"Continue until entry to @var{n}th next frame in same file."
debugger:next)
;;; Provide a `debug-trap' entry point in (ice-9 debugger). This is
;;; designed so that it can be called to explore the stack at a
;;; breakpoint, and to single step from the breakpoint.
(define-module (ice-9 debugger))
(use-modules (ice-9 debugging traps))
(define *not-yet-introduced* #t)
(define-public (debug-trap trap-context)
"Invoke the Guile debugger to explore the stack at the specified @var{trap}."
(start-stack 'debugger
(let* ((stack (tc:stack trap-context))
(flags1 (let ((trap-type (tc:type trap-context)))
(case trap-type
((#:return #:error)
(list trap-type
(tc:return-value trap-context)))
(else
(list trap-type)))))
(flags (if (tc:continuation trap-context)
(cons #:continuable flags1)
flags1))
(state (apply make-state stack 0 flags)))
(if *not-yet-introduced*
(let ((ssize (stack-length stack)))
(display "This is the Guile debugger -- for help, type `help'.\n")
(set! *not-yet-introduced* #f)
(if (= ssize 1)
(display "There is 1 frame on the stack.\n\n")
(format #t "There are ~A frames on the stack.\n\n" ssize))))
(write-state-short-with-source-location state)
(debugger-command-loop state))))
(define write-state-short-with-source-location write-state-short)
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