// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

'use strict';

/**
 * @fileoverview Parses irq events in the Linux event trace format.
 */
base.require('tracing.importer.linux_perf.parser');
base.exportTo('tracing.importer.linux_perf', function() {

  var Parser = tracing.importer.linux_perf.Parser;

  /**
   * Parses linux irq trace events.
   * @constructor
   */
  function IrqParser(importer) {
    Parser.call(this, importer);

    importer.registerEventHandler('irq_handler_entry',
        IrqParser.prototype.irqHandlerEntryEvent.bind(this));
    importer.registerEventHandler('irq_handler_exit',
        IrqParser.prototype.irqHandlerExitEvent.bind(this));
    importer.registerEventHandler('softirq_raise',
        IrqParser.prototype.softirqRaiseEvent.bind(this));
    importer.registerEventHandler('softirq_entry',
        IrqParser.prototype.softirqEntryEvent.bind(this));
    importer.registerEventHandler('softirq_exit',
        IrqParser.prototype.softirqExitEvent.bind(this));
  }

  // Matches the irq_handler_entry record
  var irqHandlerEntryRE = /irq=(\d+) name=(.+)/;

  // Matches the irq_handler_exit record
  var irqHandlerExitRE = /irq=(\d+) ret=(.+)/;

  // Matches the softirq_raise record
  var softirqRE = /vec=(\d+) \[action=(.+)\]/;

  IrqParser.prototype = {
    __proto__: Parser.prototype,

    /**
     * Parses irq events and sets up state in the importer.
     */
    irqHandlerEntryEvent: function(eventName, cpuNumber, pid, ts, eventBase) {
      var event = irqHandlerEntryRE.exec(eventBase.details);
      if (!event)
        return false;

      var irq = parseInt(event[1]);
      var name = event[2];

      var thread = this.importer.getOrCreatePseudoThread("irqs cpu " + cpuNumber);
      thread.lastEntryTs = ts;
      thread.irqName = name;

      return true;
    },

    irqHandlerExitEvent: function(eventName, cpuNumber, pid, ts, eventBase) {
      var event = irqHandlerExitRE.exec(eventBase.details);
      if (!event)
        return false;

      var irq = parseInt(event[1]);
      var ret = event[2];
      var thread = this.importer.getOrCreatePseudoThread("irqs cpu " + cpuNumber);

      if (thread.lastEntryTs !== undefined) {
        var duration = ts - thread.lastEntryTs;
        var slice = new tracing.trace_model.Slice(
            '', thread.irqName,
            tracing.getStringColorId(event[1]),
            thread.lastEntryTs, { ret: ret },
            duration);
        thread.thread.sliceGroup.pushSlice(slice);
      }
      thread.lastEntryTs = undefined;
      thread.irqName = undefined;
      return true;
    },

    softirqRaiseEvent: function(eventName, cpuNumber, pid, ts, eventBase) {return true},

    softirqEntryEvent: function(eventName, cpuNumber, pid, ts, eventBase) {
      var event = softirqRE.exec(eventBase.details);
      if (!event)
        return false;

      var action = event[2];
      var thread = this.importer.getOrCreatePseudoThread("softirq cpu " + cpuNumber);
      thread.lastEntryTs = ts;

      return true;
    },

    softirqExitEvent: function(eventName, cpuNumber, pid, ts, eventBase) {
      var event = softirqRE.exec(eventBase.details);
      if (!event)
        return false;

      var vec = parseInt(event[1]);
      var action = event[2];
      var thread = this.importer.getOrCreatePseudoThread("softirq cpu " + cpuNumber);

      if (thread.lastEntryTs !== undefined) {
        var duration = ts - thread.lastEntryTs;
        var slice = new tracing.trace_model.Slice(
            '', action,
            tracing.getStringColorId(event[1]),
            thread.lastEntryTs, { vec: vec },
            duration);
        thread.thread.sliceGroup.pushSlice(slice);
      }
      thread.lastEntryTs = undefined;
      return true;
    }
  };

  Parser.registerSubtype(IrqParser);

  return {
    IrqParser: IrqParser,
  };
});