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/* Title: Pure/Tools/debugger.scala
Author: Makarius
Interactive debugger for Isabelle/ML.
*/
package isabelle
import scala.collection.immutable.SortedMap
object Debugger
{
/* thread context */
case object Update
sealed case class Debug_State(pos: Position.T, function: String)
type Threads = SortedMap[String, List[Debug_State]]
sealed case class Context(thread_name: String, debug_states: List[Debug_State], index: Int = 0)
{
def size: Int = debug_states.length + 1
def reset: Context = copy(index = 0)
def select(i: Int): Context = copy(index = i + 1)
def thread_state: Option[Debug_State] = debug_states.headOption
def stack_state: Option[Debug_State] =
if (1 <= index && index <= debug_states.length)
Some(debug_states(index - 1))
else None
def debug_index: Option[Int] =
if (stack_state.isDefined) Some(index - 1)
else if (debug_states.nonEmpty) Some(0)
else None
def debug_state: Option[Debug_State] = stack_state orElse thread_state
def debug_position: Option[Position.T] = debug_state.map(_.pos)
override def toString: String =
stack_state match {
case None => thread_name
case Some(d) => d.function
}
}
/* debugger state */
sealed case class State(
active: Int = 0, // active views
break: Boolean = false, // break at next possible breakpoint
active_breakpoints: Set[Long] = Set.empty, // explicit breakpoint state
threads: Threads = SortedMap.empty, // thread name ~> stack of debug states
focus: Map[String, Context] = Map.empty, // thread name ~> focus
output: Map[String, Command.Results] = Map.empty) // thread name ~> output messages
{
def set_break(b: Boolean): State = copy(break = b)
def is_active: Boolean = active > 0
def inc_active: State = copy(active = active + 1)
def dec_active: State = copy(active = active - 1)
def toggle_breakpoint(breakpoint: Long): (Boolean, State) =
{
val active_breakpoints1 =
if (active_breakpoints(breakpoint)) active_breakpoints - breakpoint
else active_breakpoints + breakpoint
(active_breakpoints1(breakpoint), copy(active_breakpoints = active_breakpoints1))
}
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 =
{
val threads1 =
if (debug_states.nonEmpty) threads + (thread_name -> debug_states)
else threads - thread_name
val focus1 =
focus.get(thread_name) match {
case Some(c) if debug_states.nonEmpty =>
focus + (thread_name -> Context(thread_name, debug_states))
case _ => focus - thread_name
}
copy(threads = threads1, focus = focus1)
}
def set_focus(c: Context): State = copy(focus = focus + (c.thread_name -> c))
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)
}
/* protocol handler */
class Handler(session: Session) extends Session.Protocol_Handler
{
val debugger: Debugger = new Debugger(session)
private def debugger_state(msg: Prover.Protocol_Output): Boolean =
{
msg.properties match {
case Markup.Debugger_State(thread_name) =>
val msg_body = Symbol.decode_yxml_failsafe(UTF8.decode_permissive(msg.bytes))
val debug_states =
{
import XML.Decode._
list(pair(properties, string))(msg_body).map({
case (pos, function) => Debug_State(pos, function)
})
}
debugger.update_thread(thread_name, debug_states)
true
case _ => false
}
}
private def debugger_output(msg: Prover.Protocol_Output): Boolean =
{
msg.properties match {
case Markup.Debugger_Output(thread_name) =>
Symbol.decode_yxml_failsafe(UTF8.decode_permissive(msg.bytes)) match {
case List(XML.Elem(Markup(name, props @ Markup.Serial(i)), body)) =>
val message = XML.Elem(Markup(Markup.message(name), props), body)
debugger.add_output(thread_name, i -> session.cache.elem(message))
true
case _ => false
}
case _ => false
}
}
override val functions =
List(
Markup.DEBUGGER_STATE -> debugger_state,
Markup.DEBUGGER_OUTPUT -> debugger_output)
}
}
class Debugger private(session: Session)
{
/* debugger state */
private val state = Synchronized(Debugger.State())
private val delay_update =
Delay.first(session.output_delay) {
session.debugger_updates.post(Debugger.Update)
}
/* protocol commands */
def update_thread(thread_name: String, debug_states: List[Debugger.Debug_State])
{
state.change(_.update_thread(thread_name, debug_states))
delay_update.invoke()
}
def add_output(thread_name: String, entry: Command.Results.Entry)
{
state.change(_.add_output(thread_name, entry))
delay_update.invoke()
}
def is_active(): Boolean = session.is_ready && state.value.is_active
def ready()
{
if (is_active())
session.protocol_command("Debugger.init")
}
def init(): Unit =
state.change(st =>
{
val st1 = st.inc_active
if (session.is_ready && !st.is_active && st1.is_active)
session.protocol_command("Debugger.init")
st1
})
def exit(): Unit =
state.change(st =>
{
val st1 = st.dec_active
if (session.is_ready && st.is_active && !st1.is_active)
session.protocol_command("Debugger.exit")
st1
})
def is_break(): Boolean = state.value.break
def set_break(b: Boolean)
{
state.change(st => {
val st1 = st.set_break(b)
session.protocol_command("Debugger.break", b.toString)
st1
})
delay_update.invoke()
}
def active_breakpoint_state(breakpoint: Long): Option[Boolean] =
{
val st = state.value
if (st.is_active) Some(st.active_breakpoints(breakpoint)) else None
}
def breakpoint_state(breakpoint: Long): Boolean =
state.value.active_breakpoints(breakpoint)
def toggle_breakpoint(command: Command, breakpoint: Long)
{
state.change(st =>
{
val (breakpoint_state, st1) = st.toggle_breakpoint(breakpoint)
session.protocol_command(
"Debugger.breakpoint",
Symbol.encode(command.node_name.node),
Document_ID(command.id),
Value.Long(breakpoint),
Value.Boolean(breakpoint_state))
st1
})
}
def status(focus: Option[Debugger.Context]): (Debugger.Threads, List[XML.Tree]) =
{
val st = state.value
val output =
focus match {
case None => Nil
case Some(c) =>
(for {
(thread_name, results) <- st.output
if thread_name == c.thread_name
(_, tree) <- results.iterator
} yield tree).toList
}
(st.threads, output)
}
def focus(): List[Debugger.Context] = state.value.focus.toList.map(_._2)
def set_focus(c: Debugger.Context)
{
state.change(_.set_focus(c))
delay_update.invoke()
}
def input(thread_name: String, msg: String*): Unit =
session.protocol_command("Debugger.input", (thread_name :: msg.toList):_*)
def continue(thread_name: String): Unit = input(thread_name, "continue")
def step(thread_name: String): Unit = input(thread_name, "step")
def step_over(thread_name: String): Unit = input(thread_name, "step_over")
def step_out(thread_name: String): Unit = input(thread_name, "step_out")
def clear_output(thread_name: String)
{
state.change(_.clear_output(thread_name))
delay_update.invoke()
}
def eval(c: Debugger.Context, SML: Boolean, context: String, expression: String)
{
state.change(st => {
input(c.thread_name, "eval", c.debug_index.getOrElse(0).toString,
SML.toString, Symbol.encode(context), Symbol.encode(expression))
st.clear_output(c.thread_name)
})
delay_update.invoke()
}
def print_vals(c: Debugger.Context, SML: Boolean, context: String)
{
require(c.debug_index.isDefined)
state.change(st => {
input(c.thread_name, "print_vals", c.debug_index.getOrElse(0).toString,
SML.toString, Symbol.encode(context))
st.clear_output(c.thread_name)
})
delay_update.invoke()
}
}
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