The Tor Browser / file comparison
comparison: js/src/jshashutil.h
js/src/jshashutil.h
- branch
- TOR_BUG_9701
- changeset 15
- b8a032363ba2
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| -1:000000000000 | 0:c8099b880982 |
|---|---|
| 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 jshashutil_h | |
| 8 #define jshashutil_h | |
| 9 | |
| 10 #include "jscntxt.h" | |
| 11 | |
| 12 namespace js { | |
| 13 | |
| 14 /* | |
| 15 * Used to add entries to a js::HashMap or HashSet where the key depends on a GC | |
| 16 * thing that may be moved by generational collection between the call to | |
| 17 * lookupForAdd() and relookupOrAdd(). | |
| 18 */ | |
| 19 template <class T> | |
| 20 struct DependentAddPtr | |
| 21 { | |
| 22 typedef typename T::AddPtr AddPtr; | |
| 23 typedef typename T::Entry Entry; | |
| 24 | |
| 25 template <class Lookup> | |
| 26 DependentAddPtr(const ExclusiveContext *cx, const T &table, const Lookup &lookup) | |
| 27 : addPtr(table.lookupForAdd(lookup)) | |
| 28 #ifdef JSGC_GENERATIONAL | |
| 29 , originalGcNumber(cx->zone()->gcNumber()) | |
| 30 #endif | |
| 31 {} | |
| 32 | |
| 33 template <class KeyInput, class ValueInput> | |
| 34 bool add(const ExclusiveContext *cx, T &table, const KeyInput &key, const ValueInput &value) { | |
| 35 #ifdef JSGC_GENERATIONAL | |
| 36 bool gcHappened = originalGcNumber != cx->zone()->gcNumber(); | |
| 37 if (gcHappened) | |
| 38 addPtr = table.lookupForAdd(key); | |
| 39 #endif | |
| 40 return table.relookupOrAdd(addPtr, key, value); | |
| 41 } | |
| 42 | |
| 43 typedef void (DependentAddPtr::* ConvertibleToBool)(); | |
| 44 void nonNull() {} | |
| 45 | |
| 46 bool found() const { return addPtr.found(); } | |
| 47 operator ConvertibleToBool() const { return found() ? &DependentAddPtr::nonNull : 0; } | |
| 48 const Entry &operator*() const { return *addPtr; } | |
| 49 const Entry *operator->() const { return &*addPtr; } | |
| 50 | |
| 51 private: | |
| 52 AddPtr addPtr ; | |
| 53 #ifdef JSGC_GENERATIONAL | |
| 54 const uint64_t originalGcNumber; | |
| 55 #endif | |
| 56 | |
| 57 DependentAddPtr() MOZ_DELETE; | |
| 58 DependentAddPtr(const DependentAddPtr&) MOZ_DELETE; | |
| 59 DependentAddPtr& operator=(const DependentAddPtr&) MOZ_DELETE; | |
| 60 }; | |
| 61 | |
| 62 } // namespace js | |
| 63 | |
| 64 #endif |
