diff -r 000000000000 -r 6474c204b198 parser/html/nsHtml5SpeculativeLoad.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/parser/html/nsHtml5SpeculativeLoad.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,141 @@
+/* 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/. */
+ 
+#ifndef nsHtml5SpeculativeLoad_h
+#define nsHtml5SpeculativeLoad_h
+
+#include "nsString.h"
+
+class nsHtml5TreeOpExecutor;
+
+enum eHtml5SpeculativeLoad {
+#ifdef DEBUG
+  eSpeculativeLoadUninitialized,
+#endif
+  eSpeculativeLoadBase,
+  eSpeculativeLoadImage,
+  eSpeculativeLoadScript,
+  eSpeculativeLoadScriptFromHead,
+  eSpeculativeLoadStyle,
+  eSpeculativeLoadManifest,
+  eSpeculativeLoadSetDocumentCharset
+};
+
+class nsHtml5SpeculativeLoad {
+  public:
+    nsHtml5SpeculativeLoad();
+    ~nsHtml5SpeculativeLoad();
+    
+    inline void InitBase(const nsAString& aUrl)
+    {
+      NS_PRECONDITION(mOpCode == eSpeculativeLoadUninitialized,
+                      "Trying to reinitialize a speculative load!");
+      mOpCode = eSpeculativeLoadBase;
+      mUrl.Assign(aUrl);
+    }
+
+    inline void InitImage(const nsAString& aUrl,
+                          const nsAString& aCrossOrigin)
+    {
+      NS_PRECONDITION(mOpCode == eSpeculativeLoadUninitialized,
+                      "Trying to reinitialize a speculative load!");
+      mOpCode = eSpeculativeLoadImage;
+      mUrl.Assign(aUrl);
+      mCrossOrigin.Assign(aCrossOrigin);
+    }
+
+    inline void InitScript(const nsAString& aUrl,
+                           const nsAString& aCharset,
+                           const nsAString& aType,
+                           const nsAString& aCrossOrigin,
+                           bool aParserInHead)
+    {
+      NS_PRECONDITION(mOpCode == eSpeculativeLoadUninitialized,
+                      "Trying to reinitialize a speculative load!");
+      mOpCode = aParserInHead ?
+          eSpeculativeLoadScriptFromHead : eSpeculativeLoadScript;
+      mUrl.Assign(aUrl);
+      mCharset.Assign(aCharset);
+      mTypeOrCharsetSource.Assign(aType);
+      mCrossOrigin.Assign(aCrossOrigin);
+    }
+    
+    inline void InitStyle(const nsAString& aUrl, const nsAString& aCharset,
+			  const nsAString& aCrossOrigin)
+    {
+      NS_PRECONDITION(mOpCode == eSpeculativeLoadUninitialized,
+                      "Trying to reinitialize a speculative load!");
+      mOpCode = eSpeculativeLoadStyle;
+      mUrl.Assign(aUrl);
+      mCharset.Assign(aCharset);
+      mCrossOrigin.Assign(aCrossOrigin);
+    }
+
+    /**
+     * "Speculative" manifest loads aren't truly speculative--if a manifest
+     * gets loaded, we are committed to it. There can never be a <script>
+     * before the manifest, so the situation of having to undo a manifest due
+     * to document.write() never arises. The reason why a parser
+     * thread-discovered manifest gets loaded via the speculative load queue
+     * as opposed to tree operation queue is that the manifest must get
+     * processed before any actual speculative loads such as scripts. Thus,
+     * manifests seen by the parser thread have to maintain the queue order
+     * relative to true speculative loads. See bug 541079.
+     */
+    inline void InitManifest(const nsAString& aUrl)
+    {
+      NS_PRECONDITION(mOpCode == eSpeculativeLoadUninitialized,
+                      "Trying to reinitialize a speculative load!");
+      mOpCode = eSpeculativeLoadManifest;
+      mUrl.Assign(aUrl);
+    }
+
+    /**
+     * "Speculative" charset setting isn't truly speculative. If the charset
+     * is set via this operation, we are committed to it unless chardet or
+     * a late meta cause a reload. The reason why a parser
+     * thread-discovered charset gets communicated via the speculative load
+     * queue as opposed to tree operation queue is that the charset change
+     * must get processed before any actual speculative loads such as style
+     * sheets. Thus, encoding decisions by the parser thread have to maintain
+     * the queue order relative to true speculative loads. See bug 675499.
+     */
+    inline void InitSetDocumentCharset(nsACString& aCharset,
+                                       int32_t aCharsetSource)
+    {
+      NS_PRECONDITION(mOpCode == eSpeculativeLoadUninitialized,
+                      "Trying to reinitialize a speculative load!");
+      mOpCode = eSpeculativeLoadSetDocumentCharset;
+      CopyUTF8toUTF16(aCharset, mCharset);
+      mTypeOrCharsetSource.Assign((char16_t)aCharsetSource);
+    }
+
+    void Perform(nsHtml5TreeOpExecutor* aExecutor);
+    
+  private:
+    eHtml5SpeculativeLoad mOpCode;
+    nsString mUrl;
+    /**
+     * If mOpCode is eSpeculativeLoadStyle or eSpeculativeLoadScript[FromHead]
+     * then this is the value of the "charset" attribute. For
+     * eSpeculativeLoadSetDocumentCharset it is the charset that the
+     * document's charset is being set to. Otherwise it's empty.
+     */
+    nsString mCharset;
+    /**
+     * If mOpCode is eSpeculativeLoadSetDocumentCharset, this is a
+     * one-character string whose single character's code point is to be
+     * interpreted as a charset source integer. Otherwise, it is empty or
+     * the value of the type attribute.
+     */
+    nsString mTypeOrCharsetSource;
+    /**
+     * If mOpCode is eSpeculativeLoadImage or eSpeculativeLoadScript[FromHead],
+     * this is the value of the "crossorigin" attribute.  If the
+     * attribute is not set, this will be a void string.
+     */
+    nsString mCrossOrigin;
+};
+
+#endif // nsHtml5SpeculativeLoad_h