From c946b5ed8aea52283201c465aba3662e5397ffff Mon Sep 17 00:00:00 2001
From: Tony Garnock-Jones <tonygarnockjones@gmail.com>
Date: Sun, 14 Apr 2013 15:33:07 -0400
Subject: [PATCH] Proof-of-concept debugger

---
 marketplace/support/debug.rkt | 95 +++++++++++++++++++++++++++++++++++
 1 file changed, 95 insertions(+)
 create mode 100644 marketplace/support/debug.rkt

diff --git a/marketplace/support/debug.rkt b/marketplace/support/debug.rkt
new file mode 100644
index 0000000..f1b1df4
--- /dev/null
+++ b/marketplace/support/debug.rkt
@@ -0,0 +1,95 @@
+#lang typed/racket/base
+
+(require racket/match)
+
+(require (prefix-in core: "../main.rkt"))
+(require "../sugar-typed.rkt")
+(require "../vm.rkt")
+(require "../process.rkt")
+(require "../quasiqueue.rkt")
+
+(provide debug)
+
+(: debug : (All (ParentState) (Spawn ParentState) -> (Spawn ParentState)))
+(define (debug spawn-child)
+  (match-define (core:spawn child-spec parent-k debug-name) spawn-child)
+  (core:spawn
+   (process-spec
+    (lambda: ([pid : PID]) ;; TODO: exploit this more in messages etc.
+      (define original-cotransition ((process-spec-boot child-spec) pid))
+      (: wrapped-cotransition : (All (R) (All (S) (Transition S) -> R) -> R))
+      (define (wrapped-cotransition k)
+	(: receiver : (All (S) (Transition S) -> R))
+	(define (receiver child-transition)
+	  ((inst k S) (wrap-transition debug-name child-transition)))
+	((inst original-cotransition R) receiver))
+      wrapped-cotransition))
+   parent-k
+   (list 'debug debug-name)))
+
+(: wrap-transition : (All (ChildState) Any (Transition ChildState) -> (Transition ChildState)))
+(define (wrap-transition debug-name child-transition)
+  (match-define (core:transition child-state child-actions) child-transition)
+  (log-debug "~v: New State ~v" debug-name child-state)
+  (core:transition child-state ((inst action-tree-map ChildState)
+				(wrap-action debug-name)
+				child-actions)))
+
+(: action-tree-map : (All (State) ((Action State) -> (Action State))
+			  (ActionTree State)
+			  -> (ActionTree State)))
+(define (action-tree-map f actions)
+  ((inst map (Action State) (Action State))
+   f
+   (quasiqueue->list (action-tree->quasiqueue actions))))
+
+(: wrap-action : (All (ChildState) Any -> ((Action ChildState) -> (Action ChildState))))
+(define ((wrap-action debug-name) action)
+  (cond
+   [(core:yield? action)
+    (log-debug "~v: Yield" debug-name)
+    (core:yield (wrap-interruptk debug-name (core:yield-k action)))]
+   [(core:at-meta-level? action)
+    (core:at-meta-level (wrap-preaction "Outer" debug-name (core:at-meta-level-preaction action)))]
+   [else
+    (wrap-preaction "Inner" debug-name action)]))
+
+(: wrap-preaction : (All (ChildState) String Any (PreAction ChildState) -> (PreAction ChildState)))
+(define (wrap-preaction level debug-name preaction)
+  (match preaction
+    [(core:add-endpoint pre-eid role handler)
+     (log-debug "~v: ~a AddEndpoint ~v ~v" debug-name level pre-eid role)
+     (core:add-endpoint pre-eid role (wrap-handler debug-name handler))]
+    [(core:delete-endpoint pre-eid reason)
+     (log-debug "~v: ~a DeleteEndpoint ~v ~v" debug-name level pre-eid reason)
+     preaction]
+    [(core:send-message body orientation)
+     (log-debug "~v: ~a SendMessage ~v ~v" debug-name level body orientation)
+     preaction]
+    [(core:spawn spec maybe-k child-debug-name)
+     (log-debug "~v: ~a Spawn ~v" debug-name level child-debug-name)
+     (core:spawn spec (wrap-spawnk debug-name maybe-k) child-debug-name)]
+    [(core:quit pid reason)
+     (log-debug "~v: ~a Quit ~v ~v" debug-name level pid reason)
+     preaction]))
+
+(: wrap-interruptk : (All (ChildState) Any (InterruptK ChildState) -> (InterruptK ChildState)))
+(define (wrap-interruptk debug-name ik)
+  (lambda (state)
+    (log-debug "~v: Old State ~v" debug-name state)
+    (wrap-transition debug-name (ik state))))
+
+(: wrap-spawnk : (All (ChildState)
+		      Any
+		      (Option (PID -> (InterruptK ChildState)))
+		      -> (Option (PID -> (InterruptK ChildState)))))
+(define (wrap-spawnk debug-name maybe-k)
+  (and maybe-k
+       (lambda: ([child-pid : PID]) (wrap-interruptk debug-name (maybe-k child-pid)))))
+
+(: wrap-handler : (All (ChildState) Any (Handler ChildState) -> (Handler ChildState)))
+(define (wrap-handler debug-name h)
+  (lambda (event)
+    (log-debug "~v: Incoming Event ~v" debug-name event)
+    (wrap-interruptk debug-name (h event))))
+