startupcache/nsIStartupCache.idl
author Nicholas Nethercote <nnethercote@mozilla.com>
Thu, 22 Oct 2015 22:48:40 -0700
changeset 269446 588e410c0ddb76ce261c9c0bd344b1ad634fcb32
parent 112150 eb5c570b8a0bf064a26b46cb6e8274b52b75eaa0
permissions -rw-r--r--
Bug 1187784 (part 8) - Replace nsBaseHashtable::EnumerateRead() calls in layout/ with iterators. r=heycam. This fixes a type bug in CSSVariableDeclarations::MapRuleInfoInto(). The existing code passes aRuleData->mVariables.get(), which has type |CSSVariableDeclarations*|, into the |void*| parameter to EnumerateRead(). It then extracts that in EnumerateVariableForMapRuleInfoInto() via a cast to a different type, |nsDataHashtable<nsStringHashKey, nsString>*|. It's missing an intermediate access of CSSVariableDeclarations::mVariables. It's likely that this hasn't (seemingly) caused problems prior to now because mVariables is the only field in CSSVariableDeclarations, so mVariables->mVariables is at the same address as mVariables.

/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "nsIInputStream.idl"
#include "nsISupports.idl"
#include "nsIObserver.idl"
#include "nsIObjectOutputStream.idl"

[uuid(25957820-90a1-428c-8739-b0845d3cc534)]
interface nsIStartupCache : nsISupports
{

  /** This interface is provided for testing purposes only, basically
   *  just to solve link vagaries. See docs in StartupCache.h
   *  GetBuffer, PutBuffer, and InvalidateCache act as described 
   *  in that file. */

  uint32_t getBuffer(in string aID, out charPtr aBuffer);
  void putBuffer(in string aID, in string aBuffer, 
                            in uint32_t aLength);
 
  void invalidateCache();
  
  void ignoreDiskCache();

  /** In debug builds, wraps this object output stream with a stream that will 
   *  detect and prevent the write of a multiply-referenced non-singleton object 
   *  during serialization. In non-debug, returns an add-ref'd pointer to
   *  original stream, unwrapped. */
  nsIObjectOutputStream getDebugObjectOutputStream(in nsIObjectOutputStream aStream);

  /* Allows clients to check whether the one-time writeout after startup 
   * has finished yet, and also to set this variable as needed (so test
   * code can fire mulitple startup writes if needed).
   */
  boolean startupWriteComplete();
  void resetStartupWriteTimer();

  /* Instruct clients to always post cache ages to Telemetry, even in
     cases where it would not normally make sense.  */
  void recordAgesAlways();

  /* Allows clients to simulate the behavior of ObserverService. */
  readonly attribute nsIObserver observer;
};