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Add code to allocate agent clusters.
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Store shared agent clusters in the browsing context group via a map of
scheme & registrable domain.

Hook the document initialization methods to obtain a similar-orgin
window agent.

Fixes whatwg#4361
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@dtapuska
dtapuska committed Aug 13, 2019
1 parent 817ee1b commit 4fdf5bd
Showing 1 changed file with 98 additions and 58 deletions.
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Original file line number Diff line number Diff line change
Expand Up @@ -2643,6 +2643,7 @@ a.setAttribute('href', 'https://example.com/'); // change the content attribute
<li><dfn data-dfn-for="url" data-x="concept-url-origin" data-x-href="https://url.spec.whatwg.org/#concept-url-origin">Origin</dfn> of URLs</li>
<li><dfn data-x-href="https://url.spec.whatwg.org/#syntax-url-absolute">Absolute URL</dfn></li>
<li><dfn data-x-href="https://url.spec.whatwg.org/#syntax-url-relative">Relative URL</dfn></li>
<li><dfn data-x="host-registrable-domain" data-x-href="https://url.spec.whatwg.org/#host-registrable-domain">registrable domain</dfn></li>
<li>
The <dfn data-x-href="https://url.spec.whatwg.org/#concept-url-parser">URL parser</dfn> and
<dfn data-x-href="https://url.spec.whatwg.org/#concept-basic-url-parser">basic URL
Expand Down Expand Up @@ -78030,7 +78031,8 @@ dictionary <dfn>DragEventInit</dfn> : <span>MouseEventInit</span> {
</ol>

<p>To <dfn data-x="creating a new browsing context">create a new browsing context</dfn>, given
null or a <code>Document</code> object <var>creator</var>:</p>
null or a <code>Document</code> object <var>creator</var>, and <span>browsing context group</span>
<var>group</var>:</p>

<ol>
<li><p>Let <var>browsingContext</var> be a new <span>browsing context</span>.</p></li>
Expand All @@ -78052,9 +78054,13 @@ dictionary <dfn>DragEventInit</dfn> : <span>MouseEventInit</span> {
<li><p>Let <var>featurePolicy</var> be the result of <span>creating a feature policy</span>
given <var>browsingContext</var> and <var>origin</var>. <ref spec="FEATUREPOLICY"></p></li>

<li><p>Let <var>agent</var> be the result of<span
data-x="obtain-similar-origin-window-agent">obtaining a similar-origin window agent</span> given
<var>origin</var>, and <var>group</var>.</p></li>

<li>
<p>Let <var>realm execution context</var> be the result of <span>creating a new JavaScript
realm</span> with the following customizations:</p>
realm</span> provided <var>agent</var> with the following customizations:</p>

<ul>
<li><p>For the global object, create a new <code>Window</code> object.</p></li>
Expand Down Expand Up @@ -78111,15 +78117,17 @@ dictionary <dfn>DragEventInit</dfn> : <span>MouseEventInit</span> {
context</dfn>, given a <span>browsing context</span> <var>opener</var>:</p>

<ol>
<li><p>Let <var>browsingContext</var> be the result of <span>creating a new browsing
context</span> with <var>opener</var>'s <span>active document</span>.</p></li>
<li><p>Let <var>group</var> be <var>opener</var>'s <span>top-level browsing context</span>'s
<span data-x="tlbc group">group</span></p></li>

<li><p>Assert: <var>group</var> is non-null, as <span data-x="navigate">navigating</span> invokes
this directly.</p></li>

<li><p>Assert: <var>opener</var>'s <span>top-level browsing context</span>'s <span data-x="tlbc
group">group</span> is non-null, as <span data-x="navigate">navigating</span> invokes this
directly.</p></li>
<li><p>Let <var>browsingContext</var> be the result of <span>creating a new browsing
context</span> with <var>opener</var>'s <span>active document</span>, and <var>group</var>.</p></li>

<li><p><span data-x="bcg append">Append</span> <var>browsingContext</var> to <var>opener</var>'s
<span>top-level browsing context</span>'s <span data-x="tlbc group">group</span>.</p></li>
<li><p><span data-x="bcg append">Append</span> <var>browsingContext</var> to
<var>group</var>.</p></li>

<li><p>Set <var>browsingContext</var>'s <span>opener browsing context</span> to
<var>opener</var>.</p></li>
Expand Down Expand Up @@ -78147,7 +78155,8 @@ dictionary <dfn>DragEventInit</dfn> : <span>MouseEventInit</span> {

<ol>
<li><p>Let <var>browsingContext</var> be the result of <span>creating a new browsing
context</span> with <var>element</var>'s <span>node document</span>.</p></li>
context</span> with <var>element</var>'s <span>node document</span>, and <var>element</var>'s
<span>top-level browsing context</span>'s <span data-x="tlbc group">group</span></p></li>

<li><p>Set <var>element</var>'s <span>nested browsing context</span> to
<var>browsingContext</var>.</p></li>
Expand Down Expand Up @@ -78624,8 +78633,11 @@ console.assert(iframeWindow.frameElement === null);
<li><p><span data-x="set append">Append</span> <var>group</var> to the user agent's
<span>browsing context group set</span>.</p></li>

<li><p><span data-x="bcg append">Append</span> the result of <span>creating a new browsing
context</span> with null to <var>group</var>.</p></li>
<li><p>Let <var>browsingContext</var> be the result of <span>creating a new browsing
context</span> with null, and <var>group</var>.</p></li>

<li><p><span data-x="bcg append">Append</span> <var>browsingContext</var> to
<var>group</var>.</p></li>

<li><p>Return <var>group</var>.</p></li>
</ol>
Expand Down Expand Up @@ -81330,8 +81342,6 @@ interface <dfn>BarProp</dfn> {
<var>navigationResource</var>'s <span>forced sandboxing flag set</span>.</p></li>
</ul>



<h3 split-filename="history" id="history">Session history and navigation</h3>

<h4>The session history of browsing contexts</h4>
Expand Down Expand Up @@ -83699,9 +83709,15 @@ interface <dfn>Location</dfn> { // but see also <a href="#the-location-interface
<p>Otherwise:</p>

<ol>

<li><p>Let <var>agent</var> be the result of <span
data-x="obtain-similar-origin-window-agent">obtaining a similar-origin window agent</span> given
<var>origin</var>, and <var>browsingContext</var>'s <span data-x="tlbc
group">group</span>.</p></li>

<li>
<p>Let <var>realm execution context</var> be the result of <span>creating a new JavaScript
realm</span> with the following customizations:</p>
realm</span> provided <var>agent</var> with the following customizations:</p>

<ul>
<li><p>For the global object, create a new <code>Window</code> object.</p></li>
Expand Down Expand Up @@ -90284,45 +90300,11 @@ import "https://example.com/foo/../module2.mjs";</code></pre>
data-x="concept-global-object-realm">realms</span> that can synchronously access each other, and
thus needs to run in a single execution thread.</p>

<p>To determine whether a <code>Window</code> object <var>A</var> and a <code>Window</code> object
<var>B</var> are considered <dfn>same-agent <code>Window</code> objects</dfn>, run
these steps:</p>

<ol>
<li>
<p>If <var>A</var>'s <span>relevant settings object</span>'s <span>responsible browsing
context</span>'s <span>top-level browsing context</span>'s <span data-x="tlbc
group">group</span> is not <var>B</var>'s <span>relevant settings object</span>'s
<span>responsible browsing context</span>'s <span>top-level browsing context</span>'s <span
data-x="tlbc group">group</span>, then return false.</p>

<p class="XXX">Unfortunately this model falls apart the moment a <span>browsing context</span>
is <span data-x="a browsing context is discarded">discarded</span>. <a
href="https://github.com/whatwg/html/issues/4361">Issue #4361</a> sketches a setup that could
improve this situation.</p>
</li>

<li><p>Let <var>originA</var> be <var>A</var>'s <span>relevant settings object</span>'s <span
data-x="concept-settings-object-origin">origin</span> and <var>originB</var> be <var>B</var>'s
<span>relevant settings object</span>'s <span
data-x="concept-settings-object-origin">origin</span>.</p></li>

<li><p>If <var>originA</var> is <span>same origin</span> with <var>originB</var>, then return
true.</p></li>

<li><p>If <var>originA</var> or <var>originB</var> is not a <span
data-x="concept-origin-tuple">tuple origin</span>, then return false.</p></li>

<li><p>If <var>originA</var>'s <span data-x="concept-origin-scheme">scheme</span> is not
<var>originB</var>'s <span data-x="concept-origin-scheme">scheme</span>, then return
false.</p></li>

<li><p>If <var>originA</var>'s <span data-x="concept-origin-host">host</span> is <span>same
site</span> with <var>originB</var>'s <span data-x="concept-origin-host">host</span>, then return
true.</p></li>

<li><p>Return false.</p></li>
</ol>
<p><code>Window</code> object <var>A</var> and a <code>Window</code> object <var>B</var> are
considered <dfn>same-agent <code>Window</code> objects</dfn> if <var>A</var>'s <span>relevant
settings object</span>'s <span>realm execution context</span>'s <span>agent</span> is the same object as
<var>B</var>'s <span>relevant settings object</span>'s <span>realm execution context</span>'s
<span>agent</span>.</p>

<p class="note">All <span>same-agent <code>Window</code> objects</span> together represent a group
of <code>Window</code> objects that can synchronously access each other, though sometimes only
Expand All @@ -90332,10 +90314,6 @@ import "https://example.com/foo/../module2.mjs";</code></pre>
<p>Until such a time that this standard has a better handle on lifetimes, it defines five types of
<span data-x="agent">agents</span> that user agents must allocate at the appropriate time.</p>

<p class="note">In the future, this standard hopes to define exactly when <span
data-x="agent">agents</span> and <span data-x="agent cluster">agent clusters</span> are
created.</p>

<dl>
<dt><dfn data-export="">Similar-origin window agent</dfn></dt>
<dd>
Expand Down Expand Up @@ -90397,6 +90375,68 @@ import "https://example.com/foo/../module2.mjs";</code></pre>
in particular among which <span data-x="agent">agents</span> the backing data of
<code>SharedArrayBuffer</code> objects can be shared.</p>

<p>A <span>browsing context group</span> has associated <dfn data-export="">shared agent
clusters</dfn> (a <span data-x="ordered map">map</span> of <span>agent cluster key</span> to
<span>agent cluster</span>).</p>

<p>A <dfn data-export="">scheme-and-site</dfn> is a tuple of a <span
data-x="concept-url-scheme">scheme</span> and a <span data-x="concept-domain">domain</span>.</p>

<p>An <dfn data-export="">agent cluster key</dfn> is an <span>origin</span> or a
<span>scheme-and-site</span>.</p>

<p>An <span>agent cluster</span> has an associated <dfn>window agent</dfn>.</p>

<p>To obtain an <span>agent cluster key</span>, given an origin <var>origin</var>, run these
steps:</p>

<ol>

<li><p>If <var>origin</var> is an <span data-x="concept-origin-opaque">opaque origin</span>, then
return <var>origin</var>.</p></li>

<li><p>If <var>origin</var>'s host's <span data-x="host-registrable-domain">registrable
domain</span> is null, then return <var>origin</var>.</p></li>

<li><p>Return (<var>origin</var>'s <span data-x="concept-url-scheme">scheme</span>,
<var>origin</var>'s <span data-x="host-registrable-domain">registrable
domain</span>).</p></li>

</ol>

<p>To obtain a <dfn data-export="" data-x="obtain-similar-origin-window-agent">similar-origin
window agent</dfn>, given an <span>origin</span> <var>origin</var>, and <span>browsing context
group</span> <var>group</var>, run these steps:</p>

<ol>

<li><p>Let <var>clusterKey</var> be the result of obtaining an <span>agent cluster key</span>
given <var>origin</var>.</p></li>

<li><p>Let <var>agentCluster</var> be the result of obtaining a <span>browsing context agent
cluster</span> with <var>group</var> and <var>clusterKey</var>.</p></li>

<li><p>If <var>agentCluster</var> does not contain a <span>window agent</span>, then add a
new <span>similar-origin window agent</span> to it.</p></li>

<li><p>Return <var>agentCluster</var>'s <span>window agent</span>.</p></li>

</ol>

<p>To obtain a <dfn data-export="">browsing context agent cluster</dfn>, given a <span>browsing
context group</span> <var>group</var> and <span>agent cluster key</span> <var>key</var>, run these
steps:</p>

<ol>

<li><p>If <var>group</var>'s <span>shared agent clusters</span>[<var>key</var>] does not exist,
then set <var>group</var>'s <span>shared agent clusters</span>[<var>key</var>] to a new agent
cluster.</p></li>

<li><p>Return <var>group</var>'s <span>shared agent clusters</span>[<var>key</var>].</p></li>

</ol>

<p class="note">Conceptually, the <span>agent cluster</span> concept is an
architecture-independent, idealized "process boundary" that groups together multiple "threads"
(<span data-x="agent">agents</span>). The <span data-x="agent cluster">agent clusters</span>
Expand Down

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