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DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

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/* 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 "nsHtml5SpeculativeLoad.h"
#include "mozilla/Encoding.h"
#include "nsHtml5TreeOpExecutor.h"

using namespace mozilla;

nsHtml5SpeculativeLoad::nsHtml5SpeculativeLoad()
  : mOpCode(eSpeculativeLoadUninitialized)
  , mIsAsync(false)
  , mIsDefer(false)
  , mEncoding(nullptr)
{
  MOZ_COUNT_CTOR(nsHtml5SpeculativeLoad);
  new (&mCharsetOrSrcset) nsString;
}

nsHtml5SpeculativeLoad::~nsHtml5SpeculativeLoad()
{
  MOZ_COUNT_DTOR(nsHtml5SpeculativeLoad);
  NS_ASSERTION(mOpCode != eSpeculativeLoadUninitialized,
               "Uninitialized speculative load.");
  if (mOpCode != eSpeculativeLoadSetDocumentCharset) {
    mCharsetOrSrcset.~nsString();
  }
}

void
nsHtml5SpeculativeLoad::Perform(nsHtml5TreeOpExecutor* aExecutor)
{
  switch (mOpCode) {
    case eSpeculativeLoadBase:
      aExecutor->SetSpeculationBase(mUrlOrSizes);
      break;
    case eSpeculativeLoadCSP:
      aExecutor->AddSpeculationCSP(
        mTypeOrCharsetSourceOrDocumentModeOrMetaCSPOrSizesOrIntegrity);
      break;
    case eSpeculativeLoadMetaReferrer:
      aExecutor->SetSpeculationReferrerPolicy(mReferrerPolicyOrIntegrity);
      break;
    case eSpeculativeLoadImage:
      aExecutor->PreloadImage(
        mUrlOrSizes,
        mCrossOriginOrMedia,
        mCharsetOrSrcset,
        mTypeOrCharsetSourceOrDocumentModeOrMetaCSPOrSizesOrIntegrity,
        mReferrerPolicyOrIntegrity);
      break;
    case eSpeculativeLoadOpenPicture:
      aExecutor->PreloadOpenPicture();
      break;
    case eSpeculativeLoadEndPicture:
      aExecutor->PreloadEndPicture();
      break;
    case eSpeculativeLoadPictureSource:
      aExecutor->PreloadPictureSource(
        mCharsetOrSrcset,
        mUrlOrSizes,
        mTypeOrCharsetSourceOrDocumentModeOrMetaCSPOrSizesOrIntegrity,
        mCrossOriginOrMedia);
      break;
    case eSpeculativeLoadScript:
      aExecutor->PreloadScript(
        mUrlOrSizes,
        mCharsetOrSrcset,
        mTypeOrCharsetSourceOrDocumentModeOrMetaCSPOrSizesOrIntegrity,
        mCrossOriginOrMedia,
        mReferrerPolicyOrIntegrity,
        false,
        mIsAsync,
        mIsDefer,
        false);
      break;
    case eSpeculativeLoadScriptFromHead:
      aExecutor->PreloadScript(
        mUrlOrSizes,
        mCharsetOrSrcset,
        mTypeOrCharsetSourceOrDocumentModeOrMetaCSPOrSizesOrIntegrity,
        mCrossOriginOrMedia,
        mReferrerPolicyOrIntegrity,
        true,
        mIsAsync,
        mIsDefer,
        false);
      break;
    case eSpeculativeLoadNoModuleScript:
      aExecutor->PreloadScript(
        mUrlOrSizes,
        mCharsetOrSrcset,
        mTypeOrCharsetSourceOrDocumentModeOrMetaCSPOrSizesOrIntegrity,
        mCrossOriginOrMedia,
        mReferrerPolicyOrIntegrity,
        false,
        mIsAsync,
        mIsDefer,
        true);
      break;
    case eSpeculativeLoadNoModuleScriptFromHead:
      aExecutor->PreloadScript(
        mUrlOrSizes,
        mCharsetOrSrcset,
        mTypeOrCharsetSourceOrDocumentModeOrMetaCSPOrSizesOrIntegrity,
        mCrossOriginOrMedia,
        mReferrerPolicyOrIntegrity,
        true,
        mIsAsync,
        mIsDefer,
        true);
      break;
    case eSpeculativeLoadStyle:
      aExecutor->PreloadStyle(
        mUrlOrSizes,
        mCharsetOrSrcset,
        mCrossOriginOrMedia,
        mReferrerPolicyOrIntegrity,
        mTypeOrCharsetSourceOrDocumentModeOrMetaCSPOrSizesOrIntegrity);
      break;
    case eSpeculativeLoadManifest:
      aExecutor->ProcessOfflineManifest(mUrlOrSizes);
      break;
    case eSpeculativeLoadSetDocumentCharset: {
      NS_ASSERTION(mTypeOrCharsetSourceOrDocumentModeOrMetaCSPOrSizesOrIntegrity
                       .Length() == 1,
                   "Unexpected charset source string");
      int32_t intSource =
        (int32_t)
          mTypeOrCharsetSourceOrDocumentModeOrMetaCSPOrSizesOrIntegrity.First();
      aExecutor->SetDocumentCharsetAndSource(WrapNotNull(mEncoding), intSource);
    } break;
    case eSpeculativeLoadSetDocumentMode: {
      NS_ASSERTION(mTypeOrCharsetSourceOrDocumentModeOrMetaCSPOrSizesOrIntegrity
                       .Length() == 1,
                   "Unexpected document mode string");
      nsHtml5DocumentMode mode =
        (nsHtml5DocumentMode)
          mTypeOrCharsetSourceOrDocumentModeOrMetaCSPOrSizesOrIntegrity.First();
      aExecutor->SetDocumentMode(mode);
    } break;
    case eSpeculativeLoadPreconnect:
      aExecutor->Preconnect(mUrlOrSizes, mCrossOriginOrMedia);
      break;
    default:
      MOZ_ASSERT_UNREACHABLE("Bogus speculative load.");
      break;
  }
}