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
|
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
* 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 allocation policies.
*
* The allocators here are for system memory with lifetimes which are not
* managed by the GC. See the comment at the top of vm/MallocProvider.h.
*/
#ifndef jsalloc_h
#define jsalloc_h
#include "js/TypeDecls.h"
#include "js/Utility.h"
extern JS_PUBLIC_API(void) JS_ReportOutOfMemory(JSContext* cx);
namespace js {
enum class AllocFunction {
Malloc,
Calloc,
Realloc
};
struct ContextFriendFields;
/* Policy for using system memory functions and doing no error reporting. */
class SystemAllocPolicy
{
public:
template <typename T> T* maybe_pod_malloc(size_t numElems) { return js_pod_malloc<T>(numElems); }
template <typename T> T* maybe_pod_calloc(size_t numElems) { return js_pod_calloc<T>(numElems); }
template <typename T> T* maybe_pod_realloc(T* p, size_t oldSize, size_t newSize) {
return js_pod_realloc<T>(p, oldSize, newSize);
}
template <typename T> T* pod_malloc(size_t numElems) { return maybe_pod_malloc<T>(numElems); }
template <typename T> T* pod_calloc(size_t numElems) { return maybe_pod_calloc<T>(numElems); }
template <typename T> T* pod_realloc(T* p, size_t oldSize, size_t newSize) {
return maybe_pod_realloc<T>(p, oldSize, newSize);
}
void free_(void* p) { js_free(p); }
void reportAllocOverflow() const {}
bool checkSimulatedOOM() const {
return !js::oom::ShouldFailWithOOM();
}
};
class ExclusiveContext;
JS_FRIEND_API(void) ReportOutOfMemory(ExclusiveContext* cxArg);
/*
* Allocation policy that calls the system memory functions and reports errors
* to the context. Since the JSContext given on construction is stored for
* the lifetime of the container, this policy may only be used for containers
* whose lifetime is a shorter than the given JSContext.
*
* FIXME bug 647103 - rewrite this in terms of temporary allocation functions,
* not the system ones.
*/
class TempAllocPolicy
{
ContextFriendFields* const cx_;
/*
* Non-inline helper to call JSRuntime::onOutOfMemory with minimal
* code bloat.
*/
JS_FRIEND_API(void*) onOutOfMemory(AllocFunction allocFunc, size_t nbytes,
void* reallocPtr = nullptr);
template <typename T>
T* onOutOfMemoryTyped(AllocFunction allocFunc, size_t numElems, void* reallocPtr = nullptr) {
size_t bytes;
if (MOZ_UNLIKELY(!CalculateAllocSize<T>(numElems, &bytes)))
return nullptr;
return static_cast<T*>(onOutOfMemory(allocFunc, bytes, reallocPtr));
}
public:
MOZ_IMPLICIT TempAllocPolicy(JSContext* cx) : cx_((ContextFriendFields*) cx) {} // :(
MOZ_IMPLICIT TempAllocPolicy(ContextFriendFields* cx) : cx_(cx) {}
template <typename T>
T* maybe_pod_malloc(size_t numElems) {
return js_pod_malloc<T>(numElems);
}
template <typename T>
T* maybe_pod_calloc(size_t numElems) {
return js_pod_calloc<T>(numElems);
}
template <typename T>
T* maybe_pod_realloc(T* prior, size_t oldSize, size_t newSize) {
return js_pod_realloc<T>(prior, oldSize, newSize);
}
template <typename T>
T* pod_malloc(size_t numElems) {
T* p = maybe_pod_malloc<T>(numElems);
if (MOZ_UNLIKELY(!p))
p = onOutOfMemoryTyped<T>(AllocFunction::Malloc, numElems);
return p;
}
template <typename T>
T* pod_calloc(size_t numElems) {
T* p = maybe_pod_calloc<T>(numElems);
if (MOZ_UNLIKELY(!p))
p = onOutOfMemoryTyped<T>(AllocFunction::Calloc, numElems);
return p;
}
template <typename T>
T* pod_realloc(T* prior, size_t oldSize, size_t newSize) {
T* p2 = maybe_pod_realloc<T>(prior, oldSize, newSize);
if (MOZ_UNLIKELY(!p2))
p2 = onOutOfMemoryTyped<T>(AllocFunction::Realloc, newSize, prior);
return p2;
}
void free_(void* p) {
js_free(p);
}
JS_FRIEND_API(void) reportAllocOverflow() const;
bool checkSimulatedOOM() const {
if (js::oom::ShouldFailWithOOM()) {
js::ReportOutOfMemory(reinterpret_cast<ExclusiveContext*>(cx_));
return false;
}
return true;
}
};
} /* namespace js */
#endif /* jsalloc_h */
|
