The Tor Browser / file comparison
comparison: js/src/vm/SharedArrayObject.h
js/src/vm/SharedArrayObject.h
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| -1:000000000000 | 0:23f79878109d |
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| 1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- | |
| 2 * vim: set ts=8 sts=4 et sw=4 tw=99: | |
| 3 * This Source Code Form is subject to the terms of the Mozilla Public | |
| 4 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 6 | |
| 7 #ifndef vm_SharedArrayObject_h | |
| 8 #define vm_SharedArrayObject_h | |
| 9 | |
| 10 #include "mozilla/Atomics.h" | |
| 11 | |
| 12 #include "jsapi.h" | |
| 13 #include "jsobj.h" | |
| 14 #include "jstypes.h" | |
| 15 | |
| 16 #include "gc/Barrier.h" | |
| 17 #include "vm/ArrayBufferObject.h" | |
| 18 | |
| 19 typedef struct JSProperty JSProperty; | |
| 20 | |
| 21 namespace js { | |
| 22 | |
| 23 /* | |
| 24 * SharedArrayRawBuffer | |
| 25 * | |
| 26 * A bookkeeping object always stored immediately before the raw buffer. | |
| 27 * The buffer itself is mmap()'d and refcounted. | |
| 28 * SharedArrayBufferObjects and AsmJS code may hold references. | |
| 29 * | |
| 30 * |<------ sizeof ------>|<- length ->| | |
| 31 * | |
| 32 * | waste | SharedArrayRawBuffer | data array | waste | | |
| 33 */ | |
| 34 class SharedArrayRawBuffer | |
| 35 { | |
| 36 private: | |
| 37 mozilla::Atomic<uint32_t, mozilla::ReleaseAcquire> refcount; | |
| 38 uint32_t length; | |
| 39 | |
| 40 protected: | |
| 41 SharedArrayRawBuffer(uint8_t *buffer, uint32_t length) | |
| 42 : refcount(1), length(length) | |
| 43 { | |
| 44 JS_ASSERT(buffer == dataPointer()); | |
| 45 } | |
| 46 | |
| 47 public: | |
| 48 static SharedArrayRawBuffer *New(uint32_t length); | |
| 49 | |
| 50 inline uint8_t *dataPointer() const { | |
| 51 return ((uint8_t *)this) + sizeof(SharedArrayRawBuffer); | |
| 52 } | |
| 53 | |
| 54 inline uint32_t byteLength() const { | |
| 55 return length; | |
| 56 } | |
| 57 | |
| 58 void addReference(); | |
| 59 void dropReference(); | |
| 60 }; | |
| 61 | |
| 62 /* | |
| 63 * SharedArrayBufferObject | |
| 64 * | |
| 65 * When transferred to a WebWorker, the buffer is not neutered on the parent side, | |
| 66 * and both child and parent reference the same buffer. | |
| 67 */ | |
| 68 class SharedArrayBufferObject : public ArrayBufferObject | |
| 69 { | |
| 70 static bool byteLengthGetterImpl(JSContext *cx, CallArgs args); | |
| 71 | |
| 72 public: | |
| 73 static const Class class_; | |
| 74 static const Class protoClass; | |
| 75 | |
| 76 // Slot used for storing a pointer to the SharedArrayRawBuffer. | |
| 77 static const uint8_t RAWBUF_SLOT = ArrayBufferObject::RESERVED_SLOTS; | |
| 78 | |
| 79 static const uint8_t RESERVED_SLOTS = ArrayBufferObject::RESERVED_SLOTS + 1; | |
| 80 | |
| 81 static bool class_constructor(JSContext *cx, unsigned argc, Value *vp); | |
| 82 | |
| 83 // Create a SharedArrayBufferObject with a new SharedArrayRawBuffer. | |
| 84 static JSObject *New(JSContext *cx, uint32_t length); | |
| 85 | |
| 86 // Create a SharedArrayBufferObject using an existing SharedArrayRawBuffer. | |
| 87 static JSObject *New(JSContext *cx, SharedArrayRawBuffer *buffer); | |
| 88 | |
| 89 static bool byteLengthGetter(JSContext *cx, unsigned argc, Value *vp); | |
| 90 | |
| 91 static void Finalize(FreeOp *fop, JSObject *obj); | |
| 92 | |
| 93 void acceptRawBuffer(SharedArrayRawBuffer *buffer); | |
| 94 void dropRawBuffer(); | |
| 95 | |
| 96 SharedArrayRawBuffer *rawBufferObject() const; | |
| 97 uint8_t *dataPointer() const; | |
| 98 uint32_t byteLength() const; | |
| 99 }; | |
| 100 | |
| 101 bool | |
| 102 IsSharedArrayBuffer(HandleValue v); | |
| 103 | |
| 104 } // namespace js | |
| 105 | |
| 106 #endif // vm_SharedArrayObject_h |
