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1 // Copyright 2015 The Chromium Authors. All rights reserved. | 1 // Copyright 2015 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef WTF_Allocator_h | 5 #ifndef WTF_Allocator_h |
6 #define WTF_Allocator_h | 6 #define WTF_Allocator_h |
7 | 7 |
8 #include "wtf/Assertions.h" | 8 #include "wtf/Assertions.h" |
9 #include "wtf/Partitions.h" | 9 #include "wtf/Partitions.h" |
10 #include "wtf/StdLibExtras.h" | 10 #include "wtf/StdLibExtras.h" |
11 | 11 |
12 namespace WTF { | 12 namespace WTF { |
13 | 13 |
14 // Classes that contain references to garbage-collected objects but aren't | 14 // Classes that contain references to garbage-collected objects but aren't |
15 // themselves garbaged allocated, have some extra macros available which | 15 // themselves garbaged allocated, have some extra macros available which |
16 // allows their use to be restricted to cases where the garbage collector | 16 // allows their use to be restricted to cases where the garbage collector |
17 // is able to discover their references. These macros will be useful for | 17 // is able to discover their references. These macros will be useful for |
18 // non-garbage-collected objects to avoid unintended allocations. | 18 // non-garbage-collected objects to avoid unintended allocations. |
19 // | 19 // |
20 // STACK_ALLOCATED(): Use if the object is only stack allocated. | 20 // STACK_ALLOCATED(): Use if the object is only stack allocated. |
21 // Garbage-collected objects should be in Members but you do not need the | 21 // Garbage-collected objects should be in Members but you do not need the |
22 // trace method as they are on the stack. (Down the line these might turn | 22 // trace method as they are on the stack. (Down the line these might turn |
23 // in to raw pointers, but for now Members indicate that we have thought | 23 // in to raw pointers, but for now Members indicate that we have thought |
24 // about them and explicitly taken care of them.) | 24 // about them and explicitly taken care of them.) |
25 // | 25 // |
26 // DISALLOW_ALLOCATION(): Cannot be allocated with new operators but can be a | 26 // DISALLOW_NEW(): Cannot be allocated with new operators but can be a |
27 // part of object. If it has Members you need a trace method and the containing | 27 // part of object. If it has Members you need a trace method and the containing |
28 // object needs to call that trace method. | 28 // object needs to call that trace method. |
29 // | 29 // |
30 // ALLOW_ONLY_INLINE_ALLOCATION(): Allows only placement new operator. This | 30 // DISALLOW_NEW_EXCEPT_PLACEMENT_NEW(): Allows only placement new operator. Thi
s |
31 // disallows general allocation of this object but allows to put the object as a | 31 // disallows general allocation of this object but allows to put the object as a |
32 // value object in collections. If these have Members you need to have a trace | 32 // value object in collections. If these have Members you need to have a trace |
33 // method. That trace method will be called automatically by the on-heap | 33 // method. That trace method will be called automatically by the on-heap |
34 // collections. | 34 // collections. |
35 // | 35 // |
36 #define DISALLOW_ALLOCATION() \ | 36 #define DISALLOW_NEW() \ |
37 private: \ | 37 private: \ |
38 void* operator new(size_t) = delete; \ | 38 void* operator new(size_t) = delete; \ |
39 void* operator new(size_t, NotNullTag, void*) = delete; \ | 39 void* operator new(size_t, NotNullTag, void*) = delete; \ |
40 void* operator new(size_t, void*) = delete; \ | 40 void* operator new(size_t, void*) = delete; \ |
41 public: | 41 public: |
42 | 42 |
43 #define ALLOW_ONLY_INLINE_ALLOCATION()
\ | 43 #define DISALLOW_NEW_EXCEPT_PLACEMENT_NEW()
\ |
44 public:
\ | 44 public:
\ |
45 using IsAllowOnlyInlineAllocation = int;
\ | 45 using IsAllowOnlyInlineAllocation = int;
\ |
46 void* operator new(size_t, NotNullTag, void* location) { return location
; } \ | 46 void* operator new(size_t, NotNullTag, void* location) { return location
; } \ |
47 void* operator new(size_t, void* location) { return location; }
\ | 47 void* operator new(size_t, void* location) { return location; }
\ |
48 private:
\ | 48 private:
\ |
49 void* operator new(size_t) = delete;
\ | 49 void* operator new(size_t) = delete;
\ |
50 public: | 50 public: |
51 | 51 |
52 #define STATIC_ONLY(Type) \ | 52 #define STATIC_ONLY(Type) \ |
53 private: \ | 53 private: \ |
54 Type() = delete; \ | 54 Type() = delete; \ |
55 Type(const Type&) = delete; \ | 55 Type(const Type&) = delete; \ |
56 Type& operator=(const Type&) = delete; \ | 56 Type& operator=(const Type&) = delete; \ |
57 void* operator new(size_t) = delete; \ | 57 void* operator new(size_t) = delete; \ |
58 void* operator new(size_t, NotNullTag, void*) = delete; \ | 58 void* operator new(size_t, NotNullTag, void*) = delete; \ |
59 void* operator new(size_t, void*) = delete; \ | 59 void* operator new(size_t, void*) = delete; \ |
60 public: | 60 public: |
61 | 61 |
62 #if COMPILER(CLANG) | 62 #if COMPILER(CLANG) |
63 #define STACK_ALLOCATED() \ | 63 #define STACK_ALLOCATED() \ |
64 private: \ | 64 private: \ |
65 __attribute__((annotate("blink_stack_allocated"))) \ | 65 __attribute__((annotate("blink_stack_allocated"))) \ |
66 void* operator new(size_t) = delete; \ | 66 void* operator new(size_t) = delete; \ |
67 void* operator new(size_t, NotNullTag, void*) = delete; \ | 67 void* operator new(size_t, NotNullTag, void*) = delete; \ |
68 void* operator new(size_t, void*) = delete; \ | 68 void* operator new(size_t, void*) = delete; \ |
69 public: | 69 public: |
70 #else | 70 #else |
71 #define STACK_ALLOCATED() DISALLOW_ALLOCATION() | 71 #define STACK_ALLOCATED() DISALLOW_NEW() |
72 #endif | 72 #endif |
73 | 73 |
74 // Provides customizable overrides of fastMalloc/fastFree and operator new/delet
e | 74 // Provides customizable overrides of fastMalloc/fastFree and operator new/delet
e |
75 // | 75 // |
76 // Provided functionality: | 76 // Provided functionality: |
77 // Macro: USING_FAST_MALLOC | 77 // Macro: USING_FAST_MALLOC |
78 // | 78 // |
79 // Example usage: | 79 // Example usage: |
80 // class Widget { | 80 // class Widget { |
81 // USING_FAST_MALLOC(Widget) | 81 // USING_FAST_MALLOC(Widget) |
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121 static const char* classNameForAllocator() \ | 121 static const char* classNameForAllocator() \ |
122 { \ | 122 { \ |
123 return #type; \ | 123 return #type; \ |
124 } \ | 124 } \ |
125 private: \ | 125 private: \ |
126 typedef int __thisIsHereToForceASemicolonAfterThisMacro | 126 typedef int __thisIsHereToForceASemicolonAfterThisMacro |
127 | 127 |
128 } // namespace WTF | 128 } // namespace WTF |
129 | 129 |
130 #endif /* WTF_Allocator_h */ | 130 #endif /* WTF_Allocator_h */ |
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