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
|
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
* vim: set ts=8 sts=4 et sw=4 tw=99:
* 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/. */
/* JS Garbage Collector. */
#ifndef gc_Policy_h
#define gc_Policy_h
#include "mozilla/TypeTraits.h"
#include "gc/Barrier.h"
#include "gc/Marking.h"
#include "js/GCPolicyAPI.h"
// Forward declare the types we're defining policies for. This file is
// included in all places that define GC things, so the real definitions
// will be available when we do template expansion, allowing for use of
// static members in the underlying types. We cannot, however, use
// static_assert to verify relations between types.
class JSLinearString;
namespace js {
class AccessorShape;
class ArgumentsObject;
class ArrayBufferObject;
class ArrayBufferObjectMaybeShared;
class ArrayBufferViewObject;
class ArrayObject;
class BaseShape;
class DebugEnvironmentProxy;
class DebuggerFrame;
class ExportEntryObject;
class EnvironmentObject;
class GlobalObject;
class ImportEntryObject;
class LazyScript;
class LexicalEnvironmentObject;
class ModuleEnvironmentObject;
class ModuleNamespaceObject;
class ModuleObject;
class NativeObject;
class ObjectGroup;
class PlainObject;
class PropertyName;
class RegExpObject;
class SavedFrame;
class Scope;
class EnvironmentObject;
class ScriptSourceObject;
class Shape;
class SharedArrayBufferObject;
class StructTypeDescr;
class UnownedBaseShape;
class WasmMemoryObject;
namespace jit {
class JitCode;
} // namespace jit
} // namespace js
// Expand the given macro D for each valid GC reference type.
#define FOR_EACH_INTERNAL_GC_POINTER_TYPE(D) \
D(JSFlatString*) \
D(JSLinearString*) \
D(js::AccessorShape*) \
D(js::ArgumentsObject*) \
D(js::ArrayBufferObject*) \
D(js::ArrayBufferObjectMaybeShared*) \
D(js::ArrayBufferViewObject*) \
D(js::ArrayObject*) \
D(js::BaseShape*) \
D(js::DebugEnvironmentProxy*) \
D(js::DebuggerFrame*) \
D(js::ExportEntryObject*) \
D(js::EnvironmentObject*) \
D(js::GlobalObject*) \
D(js::ImportEntryObject*) \
D(js::LazyScript*) \
D(js::LexicalEnvironmentObject*) \
D(js::ModuleEnvironmentObject*) \
D(js::ModuleNamespaceObject*) \
D(js::ModuleObject*) \
D(js::NativeObject*) \
D(js::ObjectGroup*) \
D(js::PlainObject*) \
D(js::PropertyName*) \
D(js::RegExpObject*) \
D(js::SavedFrame*) \
D(js::Scope*) \
D(js::ScriptSourceObject*) \
D(js::Shape*) \
D(js::SharedArrayBufferObject*) \
D(js::StructTypeDescr*) \
D(js::UnownedBaseShape*) \
D(js::WasmInstanceObject*) \
D(js::WasmMemoryObject*) \
D(js::WasmTableObject*) \
D(js::jit::JitCode*)
// Expand the given macro D for each internal tagged GC pointer type.
#define FOR_EACH_INTERNAL_TAGGED_GC_POINTER_TYPE(D) \
D(js::TaggedProto)
// Expand the macro D for every GC reference type that we know about.
#define FOR_EACH_GC_POINTER_TYPE(D) \
FOR_EACH_PUBLIC_GC_POINTER_TYPE(D) \
FOR_EACH_PUBLIC_TAGGED_GC_POINTER_TYPE(D) \
FOR_EACH_INTERNAL_GC_POINTER_TYPE(D) \
FOR_EACH_INTERNAL_TAGGED_GC_POINTER_TYPE(D)
namespace js {
// Define the GCPolicy for all internal pointers.
template <typename T>
struct InternalGCPointerPolicy {
using Type = typename mozilla::RemovePointer<T>::Type;
static T initial() { return nullptr; }
static void preBarrier(T v) { Type::writeBarrierPre(v); }
static void postBarrier(T* vp, T prev, T next) { Type::writeBarrierPost(vp, prev, next); }
static void readBarrier(T v) { Type::readBarrier(v); }
static void trace(JSTracer* trc, T* vp, const char* name) {
TraceManuallyBarrieredEdge(trc, vp, name);
}
};
} // namespace js
namespace JS {
#define DEFINE_INTERNAL_GC_POLICY(type) \
template <> struct GCPolicy<type> : public js::InternalGCPointerPolicy<type> {};
FOR_EACH_INTERNAL_GC_POINTER_TYPE(DEFINE_INTERNAL_GC_POLICY)
#undef DEFINE_INTERNAL_GC_POLICY
template <typename T>
struct GCPolicy<js::HeapPtr<T>>
{
static void trace(JSTracer* trc, js::HeapPtr<T>* thingp, const char* name) {
js::TraceEdge(trc, thingp, name);
}
static bool needsSweep(js::HeapPtr<T>* thingp) {
return js::gc::IsAboutToBeFinalized(thingp);
}
};
template <typename T>
struct GCPolicy<js::ReadBarriered<T>>
{
static void trace(JSTracer* trc, js::ReadBarriered<T>* thingp, const char* name) {
js::TraceEdge(trc, thingp, name);
}
static bool needsSweep(js::ReadBarriered<T>* thingp) {
return js::gc::IsAboutToBeFinalized(thingp);
}
};
} // namespace JS
#endif // gc_Policy_h
|
