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<dt>Revision</dt> <dd><a href="http://trac.webkit.org/projects/webkit/changeset/167261">167261</a></dd>
<dt>Author</dt> <dd>burg@cs.washington.edu</dd>
<dt>Date</dt> <dd>2014-04-14 12:45:24 -0700 (Mon, 14 Apr 2014)</dd>
</dl>
<h3>Log Message</h3>
<pre>Web Replay: memoize fallback time values for document.lastModified
https://bugs.webkit.org/show_bug.cgi?id=131318
Reviewed by Joseph Pecoraro.
Source/WebCore:
If a document's Last-Modified header can't be found or used, then
document.lastModified is derived from the current system time or
from filesystem data, which is obviously nondeterministic.
It's better to handle this inside Document::lastModified rather than using
MemoizedDOMResult, because only the fallback case is nondeterministic.
Test: http/tests/inspector/replay/document-last-modified-fallback-value.html
* dom/Document.cpp:
(WebCore::Document::lastModified): Save or reuse memoized fallback value.
* replay/WebInputs.json: Add input DocumentLastModifiedDate.
LayoutTests:
* http/tests/inspector/replay/document-last-modified-fallback-value.html: Added.</pre>
<h3>Modified Paths</h3>
<ul>
<li><a href="#trunkLayoutTestsChangeLog">trunk/LayoutTests/ChangeLog</a></li>
<li><a href="#trunkSourceWebCoreChangeLog">trunk/Source/WebCore/ChangeLog</a></li>
<li><a href="#trunkSourceWebCoredomDocumentcpp">trunk/Source/WebCore/dom/Document.cpp</a></li>
<li><a href="#trunkSourceWebCorereplayWebInputsjson">trunk/Source/WebCore/replay/WebInputs.json</a></li>
</ul>
<h3>Added Paths</h3>
<ul>
<li><a href="#trunkLayoutTestshttptestsinspectorreplaydocumentlastmodifiedfallbackvaluehtml">trunk/LayoutTests/http/tests/inspector/replay/document-last-modified-fallback-value.html</a></li>
</ul>
</div>
<div id="patch">
<h3>Diff</h3>
<a id="trunkLayoutTestsChangeLog"></a>
<div class="modfile"><h4>Modified: trunk/LayoutTests/ChangeLog (167260 => 167261)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/LayoutTests/ChangeLog 2014-04-14 19:11:50 UTC (rev 167260)
+++ trunk/LayoutTests/ChangeLog 2014-04-14 19:45:24 UTC (rev 167261)
</span><span class="lines">@@ -1,3 +1,12 @@
</span><ins>+2014-04-14 Brian J. Burg <burg@cs.washington.edu>
+
+ Web Replay: memoize fallback time values for document.lastModified
+ https://bugs.webkit.org/show_bug.cgi?id=131318
+
+ Reviewed by Joseph Pecoraro.
+
+ * http/tests/inspector/replay/document-last-modified-fallback-value.html: Added.
+
</ins><span class="cx"> 2014-04-14 Eduardo Lima Mitev <elima@igalia.com>
</span><span class="cx">
</span><span class="cx"> [GTK] Unreviewed GTK gardening.
</span></span></pre></div>
<a id="trunkLayoutTestshttptestsinspectorreplaydocumentlastmodifiedfallbackvaluehtml"></a>
<div class="addfile"><h4>Added: trunk/LayoutTests/http/tests/inspector/replay/document-last-modified-fallback-value.html (0 => 167261)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/LayoutTests/http/tests/inspector/replay/document-last-modified-fallback-value.html (rev 0)
+++ trunk/LayoutTests/http/tests/inspector/replay/document-last-modified-fallback-value.html 2014-04-14 19:45:24 UTC (rev 167261)
</span><span class="lines">@@ -0,0 +1,33 @@
</span><ins>+<html>
+<head>
+<script type="text/javascript" src="../inspector-test.js"></script>
+<script type="text/javascript" src="./replay-test.js"></script>
+<script>
+
+function appendFrameWithLastModifiedDate(text) {
+ document.write('<iframe src="../resources/last-modified.php?date=' + escape(text) + '"></iframe>');
+}
+
+appendFrameWithLastModifiedDate('');
+
+function dumpNondeterministicState()
+{
+ return Date.parse(frames[0].document.body.textContent);
+}
+
+function test()
+{
+ function statesAreEqual(a, b)
+ {
+ return a === b;
+ }
+
+ InspectorTest.Replay.runSingleSegmentRefTest(statesAreEqual);
+}
+
+</script>
+</head>
+<body onload="runTest()">
+<p>Tests that we can capture and replay nondeterminism in fallback values for document.lastModified</p>
+</body>
+</html>
</ins></span></pre></div>
<a id="trunkSourceWebCoreChangeLog"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/ChangeLog (167260 => 167261)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/ChangeLog 2014-04-14 19:11:50 UTC (rev 167260)
+++ trunk/Source/WebCore/ChangeLog 2014-04-14 19:45:24 UTC (rev 167261)
</span><span class="lines">@@ -1,3 +1,23 @@
</span><ins>+2014-04-14 Brian J. Burg <burg@cs.washington.edu>
+
+ Web Replay: memoize fallback time values for document.lastModified
+ https://bugs.webkit.org/show_bug.cgi?id=131318
+
+ Reviewed by Joseph Pecoraro.
+
+ If a document's Last-Modified header can't be found or used, then
+ document.lastModified is derived from the current system time or
+ from filesystem data, which is obviously nondeterministic.
+
+ It's better to handle this inside Document::lastModified rather than using
+ MemoizedDOMResult, because only the fallback case is nondeterministic.
+
+ Test: http/tests/inspector/replay/document-last-modified-fallback-value.html
+
+ * dom/Document.cpp:
+ (WebCore::Document::lastModified): Save or reuse memoized fallback value.
+ * replay/WebInputs.json: Add input DocumentLastModifiedDate.
+
</ins><span class="cx"> 2014-04-12 Antti Koivisto <antti@apple.com>
</span><span class="cx">
</span><span class="cx"> Keep secondary tile grid for zoomed-out scale
</span></span></pre></div>
<a id="trunkSourceWebCoredomDocumentcpp"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/dom/Document.cpp (167260 => 167261)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/dom/Document.cpp 2014-04-14 19:11:50 UTC (rev 167260)
+++ trunk/Source/WebCore/dom/Document.cpp 2014-04-14 19:45:24 UTC (rev 167261)
</span><span class="lines">@@ -220,6 +220,7 @@
</span><span class="cx"> #endif
</span><span class="cx">
</span><span class="cx"> #if ENABLE(WEB_REPLAY)
</span><ins>+#include "WebReplayInputs.h"
</ins><span class="cx"> #include <replay/EmptyInputCursor.h>
</span><span class="cx"> #endif
</span><span class="cx">
</span><span class="lines">@@ -3891,8 +3892,20 @@
</span><span class="cx"> // FIXME: If this document came from the file system, the HTML5
</span><span class="cx"> // specificiation tells us to read the last modification date from the file
</span><span class="cx"> // system.
</span><del>- if (!foundDate)
- date.setMillisecondsSinceEpochForDateTime(currentTimeMS());
</del><ins>+ if (!foundDate) {
+ double fallbackDate = currentTimeMS();
+#if ENABLE(WEB_REPLAY)
+ InputCursor& cursor = inputCursor();
+ if (cursor.isCapturing())
+ cursor.appendInput<DocumentLastModifiedDate>(fallbackDate);
+ else if (cursor.isReplaying()) {
+ if (DocumentLastModifiedDate* input = cursor.fetchInput<DocumentLastModifiedDate>())
+ fallbackDate = input->fallbackValue();
+ }
+#endif
+ date.setMillisecondsSinceEpochForDateTime(fallbackDate);
+ }
+
</ins><span class="cx"> return String::format("%02d/%02d/%04d %02d:%02d:%02d", date.month() + 1, date.monthDay(), date.fullYear(), date.hour(), date.minute(), date.second());
</span><span class="cx"> }
</span><span class="cx">
</span></span></pre></div>
<a id="trunkSourceWebCorereplayWebInputsjson"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/replay/WebInputs.json (167260 => 167261)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/replay/WebInputs.json 2014-04-14 19:11:50 UTC (rev 167260)
+++ trunk/Source/WebCore/replay/WebInputs.json 2014-04-14 19:45:24 UTC (rev 167261)
</span><span class="lines">@@ -165,6 +165,14 @@
</span><span class="cx"> "members": [ ]
</span><span class="cx"> },
</span><span class="cx"> {
</span><ins>+ "name": "DocumentLastModifiedDate",
+ "description": "A fallback value used for the document's last modified date if the Last-Modified header can't be found or used.",
+ "queue": "SCRIPT_MEMOIZED",
+ "members": [
+ { "name": "fallbackValue", "type": "double" }
+ ]
+ },
+ {
</ins><span class="cx"> "name": "EndSegmentSentinel",
</span><span class="cx"> "description": "A sentinel input to signal the end of a segment.",
</span><span class="cx"> "queue": "EVENT_LOOP",
</span></span></pre>
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