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
|
// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "third_party/blink/renderer/platform/bindings/script_state.h"
#include "third_party/blink/renderer/platform/bindings/v8_binding.h"
#include "third_party/blink/renderer/platform/bindings/v8_per_context_data.h"
#include "third_party/blink/renderer/platform/instrumentation/instance_counters.h"
#include "third_party/blink/renderer/platform/instrumentation/resource_coordinator/renderer_resource_coordinator.h"
namespace blink {
ScriptState::CreateCallback ScriptState::s_create_callback_ = nullptr;
// static
void ScriptState::SetCreateCallback(CreateCallback create_callback) {
DCHECK(create_callback);
DCHECK(!s_create_callback_);
s_create_callback_ = create_callback;
}
// static
ScriptState* ScriptState::Create(v8::Local<v8::Context> context,
DOMWrapperWorld* world,
ExecutionContext* execution_context) {
return s_create_callback_(context, world, execution_context);
}
ScriptState::ScriptState(v8::Local<v8::Context> context,
DOMWrapperWorld* world,
ExecutionContext* execution_context)
: isolate_(context->GetIsolate()),
context_(isolate_, context),
world_(world),
per_context_data_(MakeGarbageCollected<V8PerContextData>(context)) {
DCHECK(world_);
context_.SetWeak(this, &OnV8ContextCollectedCallback);
context->SetAlignedPointerInEmbedderData(kV8ContextPerContextDataIndex, this);
RendererResourceCoordinator::Get()->OnScriptStateCreated(this,
execution_context);
}
ScriptState::~ScriptState() {
DCHECK(!per_context_data_);
DCHECK(context_.IsEmpty());
InstanceCounters::DecrementCounter(
InstanceCounters::kDetachedScriptStateCounter);
RendererResourceCoordinator::Get()->OnScriptStateDestroyed(this);
}
void ScriptState::Trace(Visitor* visitor) const {
visitor->Trace(per_context_data_);
visitor->Trace(world_);
}
void ScriptState::DetachGlobalObject() {
DCHECK(!context_.IsEmpty());
GetContext()->DetachGlobal();
}
void ScriptState::DisposePerContextData() {
v8::HandleScope scope(GetIsolate());
per_context_data_->Dispose();
per_context_data_ = nullptr;
InstanceCounters::IncrementCounter(
InstanceCounters::kDetachedScriptStateCounter);
RendererResourceCoordinator::Get()->OnScriptStateDetached(this);
}
void ScriptState::DissociateContext() {
DCHECK(!per_context_data_);
// On a worker thread we tear down V8's isolate without running a GC.
// Alternately we manually clear all references between V8 and Blink, and run
// operations that should have been invoked by weak callbacks if a GC were
// run.
v8::HandleScope scope(GetIsolate());
// Cut the reference from V8 context to ScriptState.
GetContext()->SetAlignedPointerInEmbedderData(kV8ContextPerContextDataIndex,
nullptr);
reference_from_v8_context_.Clear();
// Cut the reference from ScriptState to V8 context.
context_.Clear();
}
void ScriptState::OnV8ContextCollectedCallback(
const v8::WeakCallbackInfo<ScriptState>& data) {
data.GetParameter()->reference_from_v8_context_.Clear();
data.GetParameter()->context_.Clear();
}
} // namespace blink
|
