1 | /* |
2 | * Copyright (C) 2010 Google, Inc. All Rights Reserved. |
3 | * Copyright (C) 2011-2017 Apple Inc. All rights reserved. |
4 | * |
5 | * Redistribution and use in source and binary forms, with or without |
6 | * modification, are permitted provided that the following conditions |
7 | * are met: |
8 | * 1. Redistributions of source code must retain the above copyright |
9 | * notice, this list of conditions and the following disclaimer. |
10 | * 2. Redistributions in binary form must reproduce the above copyright |
11 | * notice, this list of conditions and the following disclaimer in the |
12 | * documentation and/or other materials provided with the distribution. |
13 | * |
14 | * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY |
15 | * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
16 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
17 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR |
18 | * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
19 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
20 | * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
21 | * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY |
22 | * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
23 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
24 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
25 | */ |
26 | |
27 | #include "config.h" |
28 | #include "ScriptRunner.h" |
29 | |
30 | #include "Element.h" |
31 | #include "PendingScript.h" |
32 | #include "ScriptElement.h" |
33 | |
34 | namespace WebCore { |
35 | |
36 | ScriptRunner::ScriptRunner(Document& document) |
37 | : m_document(document) |
38 | , m_timer(*this, &ScriptRunner::timerFired) |
39 | { |
40 | } |
41 | |
42 | ScriptRunner::~ScriptRunner() |
43 | { |
44 | for (auto& pendingScript : m_scriptsToExecuteSoon) { |
45 | UNUSED_PARAM(pendingScript); |
46 | m_document.decrementLoadEventDelayCount(); |
47 | } |
48 | for (auto& pendingScript : m_scriptsToExecuteInOrder) { |
49 | if (pendingScript->watchingForLoad()) |
50 | pendingScript->clearClient(); |
51 | m_document.decrementLoadEventDelayCount(); |
52 | } |
53 | for (auto& pendingScript : m_pendingAsyncScripts) { |
54 | if (pendingScript->watchingForLoad()) |
55 | pendingScript->clearClient(); |
56 | m_document.decrementLoadEventDelayCount(); |
57 | } |
58 | } |
59 | |
60 | void ScriptRunner::queueScriptForExecution(ScriptElement& scriptElement, LoadableScript& loadableScript, ExecutionType executionType) |
61 | { |
62 | ASSERT(scriptElement.element().isConnected()); |
63 | |
64 | m_document.incrementLoadEventDelayCount(); |
65 | |
66 | auto pendingScript = PendingScript::create(scriptElement, loadableScript); |
67 | switch (executionType) { |
68 | case ASYNC_EXECUTION: |
69 | m_pendingAsyncScripts.add(pendingScript.copyRef()); |
70 | break; |
71 | case IN_ORDER_EXECUTION: |
72 | m_scriptsToExecuteInOrder.append(pendingScript.copyRef()); |
73 | break; |
74 | } |
75 | pendingScript->setClient(*this); |
76 | } |
77 | |
78 | void ScriptRunner::suspend() |
79 | { |
80 | m_timer.stop(); |
81 | } |
82 | |
83 | void ScriptRunner::resume() |
84 | { |
85 | if (hasPendingScripts() && !m_document.hasActiveParserYieldToken()) |
86 | m_timer.startOneShot(0_s); |
87 | } |
88 | |
89 | void ScriptRunner::documentFinishedParsing() |
90 | { |
91 | if (!m_scriptsToExecuteSoon.isEmpty() && !m_timer.isActive()) |
92 | resume(); |
93 | } |
94 | |
95 | void ScriptRunner::notifyFinished(PendingScript& pendingScript) |
96 | { |
97 | if (pendingScript.element().willExecuteInOrder()) |
98 | ASSERT(!m_scriptsToExecuteInOrder.isEmpty()); |
99 | else { |
100 | ASSERT(m_pendingAsyncScripts.contains(pendingScript)); |
101 | m_scriptsToExecuteSoon.append(m_pendingAsyncScripts.take(pendingScript)->ptr()); |
102 | } |
103 | pendingScript.clearClient(); |
104 | |
105 | if (!m_document.hasActiveParserYieldToken()) |
106 | m_timer.startOneShot(0_s); |
107 | } |
108 | |
109 | void ScriptRunner::timerFired() |
110 | { |
111 | Ref<Document> protect(m_document); |
112 | |
113 | Vector<RefPtr<PendingScript>> scripts; |
114 | |
115 | if (!m_document.shouldDeferAsynchronousScriptsUntilParsingFinishes()) |
116 | scripts.swap(m_scriptsToExecuteSoon); |
117 | |
118 | size_t numInOrderScriptsToExecute = 0; |
119 | for (; numInOrderScriptsToExecute < m_scriptsToExecuteInOrder.size() && m_scriptsToExecuteInOrder[numInOrderScriptsToExecute]->isLoaded(); ++numInOrderScriptsToExecute) |
120 | scripts.append(m_scriptsToExecuteInOrder[numInOrderScriptsToExecute].ptr()); |
121 | if (numInOrderScriptsToExecute) |
122 | m_scriptsToExecuteInOrder.remove(0, numInOrderScriptsToExecute); |
123 | |
124 | for (auto& currentScript : scripts) { |
125 | auto script = WTFMove(currentScript); |
126 | ASSERT(script); |
127 | // Paper over https://bugs.webkit.org/show_bug.cgi?id=144050 |
128 | if (!script) |
129 | continue; |
130 | ASSERT(script->needsLoading()); |
131 | script->element().executePendingScript(*script); |
132 | m_document.decrementLoadEventDelayCount(); |
133 | } |
134 | } |
135 | |
136 | } |
137 | |