1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
|
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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 "GeckoProfiler.h"
#include "mozilla/dom/Document.h"
#include "mozilla/HoldDropJSObjects.h"
#include "mozilla/StaticPrefs_dom.h"
#include "mozilla/Unused.h"
#include "mozilla/Utf8.h" // mozilla::Utf8Unit
#include "js/OffThreadScriptCompilation.h"
#include "js/SourceText.h"
#include "js/loader/LoadContextBase.h"
#include "js/loader/ModuleLoadRequest.h"
#include "ScriptLoadContext.h"
#include "ModuleLoadRequest.h"
#include "nsContentUtils.h"
#include "nsICacheInfoChannel.h"
#include "nsIClassOfService.h"
#include "nsISupportsPriority.h"
namespace mozilla::dom {
//////////////////////////////////////////////////////////////
// ScriptLoadContext
//////////////////////////////////////////////////////////////
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(ScriptLoadContext)
NS_INTERFACE_MAP_END_INHERITING(JS::loader::LoadContextBase)
NS_IMPL_CYCLE_COLLECTION_CLASS(ScriptLoadContext)
NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN_INHERITED(ScriptLoadContext,
JS::loader::LoadContextBase)
MOZ_ASSERT(!tmp->mOffThreadToken);
MOZ_ASSERT(!tmp->mRunnable);
tmp->MaybeUnblockOnload();
NS_IMPL_CYCLE_COLLECTION_UNLINK_END
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(ScriptLoadContext,
JS::loader::LoadContextBase)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mLoadBlockedDocument)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
NS_IMPL_ADDREF_INHERITED(ScriptLoadContext, JS::loader::LoadContextBase)
NS_IMPL_RELEASE_INHERITED(ScriptLoadContext, JS::loader::LoadContextBase)
ScriptLoadContext::ScriptLoadContext()
: JS::loader::LoadContextBase(JS::loader::ContextKind::Window),
mScriptMode(ScriptMode::eBlocking),
mScriptFromHead(false),
mIsInline(true),
mInDeferList(false),
mInAsyncList(false),
mIsNonAsyncScriptInserted(false),
mIsXSLT(false),
mInCompilingList(false),
mIsTracking(false),
mWasCompiledOMT(false),
mOffThreadToken(nullptr),
mRunnable(nullptr),
mLineNo(1),
mColumnNo(0),
mIsPreload(false),
mUnreportedPreloadError(NS_OK) {}
ScriptLoadContext::~ScriptLoadContext() {
MOZ_ASSERT(NS_IsMainThread());
// Off-thread parsing must have completed by this point.
MOZ_DIAGNOSTIC_ASSERT(!mOffThreadToken && !mRunnable);
mRequest = nullptr;
MaybeUnblockOnload();
}
void ScriptLoadContext::BlockOnload(Document* aDocument) {
MOZ_ASSERT(!mLoadBlockedDocument);
aDocument->BlockOnload();
mLoadBlockedDocument = aDocument;
}
void ScriptLoadContext::MaybeUnblockOnload() {
if (mLoadBlockedDocument) {
mLoadBlockedDocument->UnblockOnload(false);
mLoadBlockedDocument = nullptr;
}
}
void ScriptLoadContext::MaybeCancelOffThreadScript() {
MOZ_ASSERT(NS_IsMainThread());
if (!mOffThreadToken) {
return;
}
// Cancel parse if it hasn't been started yet or wait for it to finish and
// clean up finished parse data.
JSContext* cx = danger::GetJSContext();
JS::CancelOffThreadToken(cx, mOffThreadToken);
mOffThreadToken = nullptr;
// Clear the pointer to the runnable. It may still run later if we didn't
// cancel in time. In this case the runnable is held live by the reference
// passed to Dispatch, which is dropped after it runs.
mRunnable = nullptr;
MaybeUnblockOnload();
}
void ScriptLoadContext::SetScriptMode(bool aDeferAttr, bool aAsyncAttr,
bool aLinkPreload) {
if (aLinkPreload) {
mScriptMode = ScriptMode::eLinkPreload;
} else if (aAsyncAttr) {
mScriptMode = ScriptMode::eAsync;
} else if (aDeferAttr || mRequest->IsModuleRequest()) {
mScriptMode = ScriptMode::eDeferred;
} else {
mScriptMode = ScriptMode::eBlocking;
}
}
// static
void ScriptLoadContext::PrioritizeAsPreload(nsIChannel* aChannel) {
if (nsCOMPtr<nsIClassOfService> cos = do_QueryInterface(aChannel)) {
cos->AddClassFlags(nsIClassOfService::Unblocked);
}
if (nsCOMPtr<nsISupportsPriority> sp = do_QueryInterface(aChannel)) {
sp->AdjustPriority(nsISupportsPriority::PRIORITY_HIGHEST);
}
}
void ScriptLoadContext::PrioritizeAsPreload() {
if (!IsLinkPreloadScript()) {
// Do the prioritization only if this request has not already been created
// as a preload.
PrioritizeAsPreload(Channel());
}
}
bool ScriptLoadContext::IsPreload() const {
if (mRequest->IsModuleRequest() && !mRequest->IsTopLevel()) {
JS::loader::ModuleLoadRequest* root =
mRequest->AsModuleRequest()->GetRootModule();
return root->GetScriptLoadContext()->IsPreload();
}
MOZ_ASSERT_IF(mIsPreload, !GetScriptElement());
return mIsPreload;
}
bool ScriptLoadContext::CompileStarted() const {
return mRequest->IsCompiling() ||
(mRequest->IsReadyToRun() && mWasCompiledOMT);
}
nsIScriptElement* ScriptLoadContext::GetScriptElement() const {
nsCOMPtr<nsIScriptElement> scriptElement =
do_QueryInterface(mRequest->mFetchOptions->mElement);
return scriptElement;
}
void ScriptLoadContext::SetIsLoadRequest(nsIScriptElement* aElement) {
MOZ_ASSERT(aElement);
MOZ_ASSERT(!GetScriptElement());
MOZ_ASSERT(IsPreload());
// We are not tracking our own element, and are relying on the one in
// FetchOptions.
mRequest->mFetchOptions->mElement = do_QueryInterface(aElement);
mIsPreload = false;
}
void ScriptLoadContext::GetProfilerLabel(nsACString& aOutString) {
if (!profiler_is_active()) {
aOutString.Append("<script> element");
return;
}
aOutString.Append("<script");
if (IsAsyncScript()) {
aOutString.Append(" async");
} else if (IsDeferredScript()) {
aOutString.Append(" defer");
}
if (mRequest->IsModuleRequest()) {
aOutString.Append(" type=\"module\"");
}
nsAutoCString url;
if (mRequest->mURI) {
mRequest->mURI->GetAsciiSpec(url);
} else {
url = "<unknown>";
}
if (mIsInline) {
if (GetParserCreated() != NOT_FROM_PARSER) {
aOutString.Append("> inline at line ");
aOutString.AppendInt(mLineNo);
aOutString.Append(" of ");
} else {
aOutString.Append("> inline (dynamically created) in ");
}
aOutString.Append(url);
} else {
aOutString.Append(" src=\"");
aOutString.Append(url);
aOutString.Append("\">");
}
}
} // namespace mozilla::dom
|
