/* Title: Pure/Tools/debugger.scala
Author: Makarius
Interactive debugger for Isabelle/ML.
*/
package isabelle
object Debugger
{
/* global state */
sealed case class Debug_State(
pos: Position.T,
function: String)
sealed case class State(
session: Session = new Session(Resources.empty),
threads: Map[String, List[Debug_State]] = Map.empty, // thread name ~> stack of debug states
output: Map[String, Command.Results] = Map.empty) // thread name ~> output messages
{
def set_session(new_session: Session): State =
copy(session = new_session)
def get_thread(thread_name: String): List[Debug_State] =
threads.getOrElse(thread_name, Nil)
def update_thread(thread_name: String, debug_states: List[Debug_State]): State =
copy(threads = threads + (thread_name -> debug_states))
def get_output(thread_name: String): Command.Results =
output.getOrElse(thread_name, Command.Results.empty)
def add_output(thread_name: String, entry: Command.Results.Entry): State =
copy(output = output + (thread_name -> (get_output(thread_name) + entry)))
def clear_output(thread_name: String): State =
copy(output = output - thread_name)
def purge(thread_name: String): State =
if (get_thread(thread_name).isEmpty)
copy(threads = threads - thread_name, output = output - thread_name)
else this
}
private val global_state = Synchronized(State())
def current_state(): State = global_state.value
/* protocol handler */
sealed case class Update(thread_names: Set[String])
class Handler extends Session.Protocol_Handler
{
private var updated = Set.empty[String]
private val delay_update =
Simple_Thread.delay_first(current_state().session.output_delay) {
current_state().session.debugger_updates.post(Update(updated))
updated = Set.empty
}
private def update(name: String)
{
updated += name
delay_update.invoke()
}
private def debugger_state(prover: Prover, msg: Prover.Protocol_Output): Boolean =
{
msg.properties match {
case Markup.Debugger_State(thread_name) =>
val msg_body =
YXML.parse_body_failsafe(Symbol.decode(UTF8.decode_permissive(msg.bytes)))
val debug_states =
{
import XML.Decode._
list(pair(properties, Symbol.decode_string))(msg_body).map({
case (pos, function) => Debug_State(pos, function)
})
}
global_state.change(_.update_thread(thread_name, debug_states))
update(thread_name)
true
case _ => false
}
}
private def debugger_output(prover: Prover, msg: Prover.Protocol_Output): Boolean =
{
msg.properties match {
case Markup.Debugger_Output(thread_name) =>
val msg_body =
prover.xml_cache.body(
YXML.parse_body_failsafe(Symbol.decode(UTF8.decode_permissive(msg.bytes))))
msg_body match {
case List(XML.Elem(Markup(name, props @ Markup.Serial(i)), body)) =>
val message = XML.Elem(Markup(Markup.message(name), props), body)
global_state.change(_.add_output(thread_name, i -> message))
update(thread_name)
true
case _ => false
}
case _ => false
}
}
val functions =
Map(
Markup.DEBUGGER_STATE -> debugger_state _,
Markup.DEBUGGER_OUTPUT -> debugger_output _)
}
/* protocol commands */
def init(session: Session)
{
global_state.change(_.set_session(session))
current_state().session.protocol_command("Debugger.init")
}
def cancel(thread_name: String): Unit =
current_state().session.protocol_command("Debugger.cancel", thread_name)
def input(thread_name: String, msg: String*): Unit =
current_state().session.protocol_command("Debugger.input", (thread_name :: msg.toList):_*)
def continue(thread_name: String): Unit = input(thread_name, "continue")
def eval(thread_name: String, index: Int, SML: Boolean, context: String, expression: String): Unit =
{
input(thread_name, "eval",
index.toString, SML.toString, Symbol.encode(context), Symbol.encode(expression))
}
}