The Tor Browser / file comparison
comparison: js/src/vm/MallocProvider.h
js/src/vm/MallocProvider.h
- branch
- TOR_BUG_9701
- changeset 15
- b8a032363ba2
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| -1:000000000000 | 0:c13cf11a0683 |
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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 /* | |
| 8 * Hierarchy of SpiderMonkey system memory allocators: | |
| 9 * | |
| 10 * - System {m,c,re}alloc/new/free: Overridden by jemalloc in most | |
| 11 * environments. Do not use these functions directly. | |
| 12 * | |
| 13 * - js_{m,c,re}alloc/new/free: Wraps the system allocators and adds a | |
| 14 * failure injection framework for use by the fuzzers as well as templated, | |
| 15 * typesafe variants. See js/public/Utility.h. | |
| 16 * | |
| 17 * - AllocPolicy: An interface for the js allocators, for use with templates. | |
| 18 * These allocators are for system memory whose lifetime is not associated | |
| 19 * with a GC thing. See js/src/jsalloc.h. | |
| 20 * | |
| 21 * - SystemAllocPolicy: No extra functionality over bare allocators. | |
| 22 * | |
| 23 * - TempAllocPolicy: Adds automatic error reporting to the provided | |
| 24 * Context when allocations fail. | |
| 25 * | |
| 26 * - MallocProvider. A mixin base class that handles automatically updating | |
| 27 * the GC's state in response to allocations that are tied to a GC lifetime | |
| 28 * or are for a particular GC purpose. These allocators must only be used | |
| 29 * for memory that will be freed when a GC thing is swept. | |
| 30 * | |
| 31 * - gc::Zone: Automatically triggers zone GC. | |
| 32 * - JSRuntime: Automatically triggers full GC. | |
| 33 * - ThreadsafeContext > ExclusiveContext > JSContext: | |
| 34 * Dispatches directly to the runtime. | |
| 35 */ | |
| 36 | |
| 37 #ifndef vm_MallocProvider_h | |
| 38 #define vm_MallocProvider_h | |
| 39 | |
| 40 #include "mozilla/Attributes.h" | |
| 41 #include "mozilla/Likely.h" | |
| 42 | |
| 43 #include "js/Utility.h" | |
| 44 | |
| 45 namespace js { | |
| 46 | |
| 47 template<class Client> | |
| 48 struct MallocProvider | |
| 49 { | |
| 50 void *malloc_(size_t bytes) { | |
| 51 Client *client = static_cast<Client *>(this); | |
| 52 client->updateMallocCounter(bytes); | |
| 53 void *p = js_malloc(bytes); | |
| 54 return MOZ_LIKELY(!!p) ? p : client->onOutOfMemory(nullptr, bytes); | |
| 55 } | |
| 56 | |
| 57 void *calloc_(size_t bytes) { | |
| 58 Client *client = static_cast<Client *>(this); | |
| 59 client->updateMallocCounter(bytes); | |
| 60 void *p = js_calloc(bytes); | |
| 61 return MOZ_LIKELY(!!p) ? p : client->onOutOfMemory(reinterpret_cast<void *>(1), bytes); | |
| 62 } | |
| 63 | |
| 64 void *realloc_(void *p, size_t oldBytes, size_t newBytes) { | |
| 65 Client *client = static_cast<Client *>(this); | |
| 66 /* | |
| 67 * For compatibility we do not account for realloc that decreases | |
| 68 * previously allocated memory. | |
| 69 */ | |
| 70 if (newBytes > oldBytes) | |
| 71 client->updateMallocCounter(newBytes - oldBytes); | |
| 72 void *p2 = js_realloc(p, newBytes); | |
| 73 return MOZ_LIKELY(!!p2) ? p2 : client->onOutOfMemory(p, newBytes); | |
| 74 } | |
| 75 | |
| 76 void *realloc_(void *p, size_t bytes) { | |
| 77 Client *client = static_cast<Client *>(this); | |
| 78 /* | |
| 79 * For compatibility we do not account for realloc that increases | |
| 80 * previously allocated memory. | |
| 81 */ | |
| 82 if (!p) | |
| 83 client->updateMallocCounter(bytes); | |
| 84 void *p2 = js_realloc(p, bytes); | |
| 85 return MOZ_LIKELY(!!p2) ? p2 : client->onOutOfMemory(p, bytes); | |
| 86 } | |
| 87 | |
| 88 template <class T> | |
| 89 T *pod_malloc() { | |
| 90 return (T *)malloc_(sizeof(T)); | |
| 91 } | |
| 92 | |
| 93 template <class T> | |
| 94 T *pod_calloc() { | |
| 95 return (T *)calloc_(sizeof(T)); | |
| 96 } | |
| 97 | |
| 98 template <class T> | |
| 99 T *pod_malloc(size_t numElems) { | |
| 100 if (numElems & mozilla::tl::MulOverflowMask<sizeof(T)>::value) { | |
| 101 Client *client = static_cast<Client *>(this); | |
| 102 client->reportAllocationOverflow(); | |
| 103 return nullptr; | |
| 104 } | |
| 105 return (T *)malloc_(numElems * sizeof(T)); | |
| 106 } | |
| 107 | |
| 108 template <class T> | |
| 109 T *pod_calloc(size_t numElems, JSCompartment *comp = nullptr, JSContext *cx = nullptr) { | |
| 110 if (numElems & mozilla::tl::MulOverflowMask<sizeof(T)>::value) { | |
| 111 Client *client = static_cast<Client *>(this); | |
| 112 client->reportAllocationOverflow(); | |
| 113 return nullptr; | |
| 114 } | |
| 115 return (T *)calloc_(numElems * sizeof(T)); | |
| 116 } | |
| 117 | |
| 118 JS_DECLARE_NEW_METHODS(new_, malloc_, MOZ_ALWAYS_INLINE) | |
| 119 }; | |
| 120 | |
| 121 } /* namespace js */ | |
| 122 | |
| 123 #endif /* vm_MallocProvider_h */ |
