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/* Title: Pure/Tools/simplifier_trace.scala
Author: Lars Hupel
Interactive Simplifier trace.
*/
package isabelle
import scala.annotation.tailrec
import scala.collection.immutable.SortedMap
object Simplifier_Trace
{
/* trace items from the prover */
val TEXT = "text"
val Text = new Properties.String(TEXT)
val PARENT = "parent"
val Parent = new Properties.Long(PARENT)
val SUCCESS = "success"
val Success = new Properties.Boolean(SUCCESS)
val MEMORY = "memory"
val Memory = new Properties.Boolean(MEMORY)
object Item
{
case class Data(
serial: Long, markup: String, text: String,
parent: Long, props: Properties.T, content: XML.Body)
{
def memory: Boolean = Memory.unapply(props) getOrElse true
}
def unapply(tree: XML.Tree): Option[(String, Data)] =
tree match {
case XML.Elem(Markup(Markup.RESULT, Markup.Serial(serial)),
List(XML.Elem(Markup(markup, props), content)))
if markup.startsWith("simp_trace_") => // FIXME proper comparison of string constants
(props, props) match {
case (Text(text), Parent(parent)) =>
Some((markup, Data(serial, markup, text, parent, props, content)))
case _ => None
}
case _ => None
}
}
/* replies to the prover */
case class Answer private[Simplifier_Trace](val name: String, val string: String)
object Answer
{
object step
{
val skip = Answer("skip", "Skip")
val continue = Answer("continue", "Continue")
val continue_trace = Answer("continue_trace", "Continue (with full trace)")
val continue_passive = Answer("continue_passive", "Continue (without asking)")
val continue_disable = Answer("continue_disable", "Continue (without any trace)")
val all = List(continue, continue_trace, continue_passive, continue_disable, skip)
}
object hint_fail
{
val exit = Answer("exit", "Exit")
val redo = Answer("redo", "Redo")
val all = List(redo, exit)
}
}
val all_answers: List[Answer] = Answer.step.all ::: Answer.hint_fail.all
/* GUI interaction */
case object Event
/* manager thread */
private case class Handle_Results(
session: Session, id: Document_ID.Command, results: Command.Results, slot: Promise[Context])
private case class Generate_Trace(results: Command.Results, slot: Promise[Trace])
private case class Cancel(serial: Long)
private object Clear_Memory
case class Reply(session: Session, serial: Long, answer: Answer)
case class Question(data: Item.Data, answers: List[Answer])
case class Context(
last_serial: Long = 0L,
questions: SortedMap[Long, Question] = SortedMap.empty)
{
def +(q: Question): Context =
copy(questions = questions + ((q.data.serial, q)))
def -(s: Long): Context =
copy(questions = questions - s)
def with_serial(s: Long): Context =
copy(last_serial = Math.max(last_serial, s))
}
case class Trace(entries: List[Item.Data])
case class Index(text: String, content: XML.Body)
object Index
{
def of_data(data: Item.Data): Index =
Index(data.text, data.content)
}
def handle_results(session: Session, id: Document_ID.Command, results: Command.Results): Context =
{
val slot = Future.promise[Context]
manager.send(Handle_Results(session, id, results, slot))
slot.join
}
def generate_trace(results: Command.Results): Trace =
{
val slot = Future.promise[Trace]
manager.send(Generate_Trace(results, slot))
slot.join
}
def clear_memory() =
manager.send(Clear_Memory)
def send_reply(session: Session, serial: Long, answer: Answer) =
manager.send(Reply(session, serial, answer))
def make_manager: Consumer_Thread[Any] =
{
var contexts = Map.empty[Document_ID.Command, Context]
var memory_children = Map.empty[Long, Set[Long]]
var memory = Map.empty[Index, Answer]
def find_question(serial: Long): Option[(Document_ID.Command, Question)] =
contexts collectFirst {
case (id, context) if context.questions contains serial =>
(id, context.questions(serial))
}
def do_cancel(serial: Long, id: Document_ID.Command)
{
// To save memory, we could try to remove empty contexts at this point.
// However, if a new serial gets attached to the same command_id after we deleted
// its context, its last_serial counter will start at 0 again, and we'll think the
// old serials are actually new
contexts += (id -> (contexts(id) - serial))
}
def do_reply(session: Session, serial: Long, answer: Answer)
{
session.protocol_command(
"Simplifier_Trace.reply", Value.Long(serial), answer.name)
}
Consumer_Thread.fork[Any]("Simplifier_Trace.manager", daemon = true)(
consume = (arg: Any) =>
{
arg match {
case Handle_Results(session, id, results, slot) =>
var new_context = contexts.getOrElse(id, Context())
var new_serial = new_context.last_serial
for ((serial, result) <- results.iterator if serial > new_context.last_serial)
{
result match {
case Item(markup, data) =>
memory_children +=
(data.parent -> (memory_children.getOrElse(data.parent, Set.empty) + serial))
markup match {
case Markup.SIMP_TRACE_STEP =>
val index = Index.of_data(data)
memory.get(index) match {
case Some(answer) if data.memory =>
do_reply(session, serial, answer)
case _ =>
new_context += Question(data, Answer.step.all)
}
case Markup.SIMP_TRACE_HINT =>
data.props match {
case Success(false) =>
results.get(data.parent) match {
case Some(Item(Markup.SIMP_TRACE_STEP, _)) =>
new_context += Question(data, Answer.hint_fail.all)
case _ =>
// unknown, better send a default reply
do_reply(session, data.serial, Answer.hint_fail.exit)
}
case _ =>
}
case Markup.SIMP_TRACE_IGNORE =>
// At this point, we know that the parent of this 'IGNORE' entry is a 'STEP'
// entry, and that that 'STEP' entry is about to be replayed. Hence, we need
// to selectively purge the replies which have been memorized, going down from
// the parent to all leaves.
@tailrec
def purge(queue: Vector[Long]): Unit =
queue match {
case s +: rest =>
for (Item(Markup.SIMP_TRACE_STEP, data) <- results.get(s))
memory -= Index.of_data(data)
val children = memory_children.getOrElse(s, Set.empty)
memory_children -= s
purge(rest ++ children.toVector)
case _ =>
}
purge(Vector(data.parent))
case _ =>
}
case _ =>
}
new_serial = serial
}
new_context = new_context.with_serial(new_serial)
contexts += (id -> new_context)
slot.fulfill(new_context)
case Generate_Trace(results, slot) =>
// Since there are potentially lots of trace messages, we do not cache them here again.
// Instead, everytime the trace is being requested, we re-assemble it based on the
// current results.
val items =
results.iterator.collect { case (_, Item(_, data)) => data }.toList
slot.fulfill(Trace(items))
case Cancel(serial) =>
find_question(serial) match {
case Some((id, _)) =>
do_cancel(serial, id)
case None =>
}
case Clear_Memory =>
memory_children = Map.empty
memory = Map.empty
case Reply(session, serial, answer) =>
find_question(serial) match {
case Some((id, Question(data, _))) =>
if (data.markup == Markup.SIMP_TRACE_STEP && data.memory)
{
val index = Index.of_data(data)
memory += (index -> answer)
}
do_cancel(serial, id)
case None =>
Output.warning("send_reply: unknown serial " + serial)
}
do_reply(session, serial, answer)
session.trace_events.post(Event)
}
true
},
finish = () => contexts = Map.empty
)
}
private val manager_variable = Synchronized[Option[Consumer_Thread[Any]]](None)
def manager: Consumer_Thread[Any] =
manager_variable.value match {
case Some(thread) if thread.is_active => thread
case _ => error("Bad Simplifier_Trace.manager thread")
}
/* protocol handler */
class Handler extends Session.Protocol_Handler
{
try { manager }
catch { case ERROR(_) => manager_variable.change(_ => Some(make_manager)) }
override def exit() =
{
manager.send(Clear_Memory)
manager.shutdown()
manager_variable.change(_ => None)
}
private def cancel(msg: Prover.Protocol_Output): Boolean =
msg.properties match {
case Markup.Simp_Trace_Cancel(serial) =>
manager.send(Cancel(serial))
true
case _ =>
false
}
val functions = List(Markup.SIMP_TRACE_CANCEL -> cancel _)
}
}
