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comparison: js/src/jscompartmentinlines.h
js/src/jscompartmentinlines.h
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| -1:000000000000 | 0:fc628f1e792c |
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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 jscompartmentinlines_h | |
| 8 #define jscompartmentinlines_h | |
| 9 | |
| 10 #include "jscompartment.h" | |
| 11 | |
| 12 #include "gc/Barrier-inl.h" | |
| 13 | |
| 14 inline void | |
| 15 JSCompartment::initGlobal(js::GlobalObject &global) | |
| 16 { | |
| 17 JS_ASSERT(global.compartment() == this); | |
| 18 JS_ASSERT(!global_); | |
| 19 global_ = &global; | |
| 20 } | |
| 21 | |
| 22 js::GlobalObject * | |
| 23 JSCompartment::maybeGlobal() const | |
| 24 { | |
| 25 JS_ASSERT_IF(global_, global_->compartment() == this); | |
| 26 return global_; | |
| 27 } | |
| 28 | |
| 29 js::AutoCompartment::AutoCompartment(ExclusiveContext *cx, JSObject *target) | |
| 30 : cx_(cx), | |
| 31 origin_(cx->compartment_) | |
| 32 { | |
| 33 cx_->enterCompartment(target->compartment()); | |
| 34 } | |
| 35 | |
| 36 js::AutoCompartment::AutoCompartment(ExclusiveContext *cx, JSCompartment *target) | |
| 37 : cx_(cx), | |
| 38 origin_(cx_->compartment_) | |
| 39 { | |
| 40 cx_->enterCompartment(target); | |
| 41 } | |
| 42 | |
| 43 js::AutoCompartment::~AutoCompartment() | |
| 44 { | |
| 45 cx_->leaveCompartment(origin_); | |
| 46 } | |
| 47 | |
| 48 inline bool | |
| 49 JSCompartment::wrap(JSContext *cx, JS::MutableHandleValue vp, JS::HandleObject existing) | |
| 50 { | |
| 51 JS_ASSERT_IF(existing, vp.isObject()); | |
| 52 | |
| 53 /* Only GC things have to be wrapped or copied. */ | |
| 54 if (!vp.isMarkable()) | |
| 55 return true; | |
| 56 | |
| 57 /* Handle strings. */ | |
| 58 if (vp.isString()) { | |
| 59 JS::RootedString str(cx, vp.toString()); | |
| 60 if (!wrap(cx, str.address())) | |
| 61 return false; | |
| 62 vp.setString(str); | |
| 63 return true; | |
| 64 } | |
| 65 | |
| 66 JS_ASSERT(vp.isObject()); | |
| 67 | |
| 68 /* | |
| 69 * All that's left are objects. | |
| 70 * | |
| 71 * Object wrapping isn't the fastest thing in the world, in part because | |
| 72 * we have to unwrap and invoke the prewrap hook to find the identity | |
| 73 * object before we even start checking the cache. Neither of these | |
| 74 * operations are needed in the common case, where we're just wrapping | |
| 75 * a plain JS object from the wrappee's side of the membrane to the | |
| 76 * wrapper's side. | |
| 77 * | |
| 78 * To optimize this, we note that the cache should only ever contain | |
| 79 * identity objects - that is to say, objects that serve as the | |
| 80 * canonical representation for a unique object identity observable by | |
| 81 * script. Unwrap and prewrap are both steps that we take to get to the | |
| 82 * identity of an incoming objects, and as such, they shuld never map | |
| 83 * one identity object to another object. This means that we can safely | |
| 84 * check the cache immediately, and only risk false negatives. Do this | |
| 85 * in opt builds, and do both in debug builds so that we can assert | |
| 86 * that we get the same answer. | |
| 87 */ | |
| 88 #ifdef DEBUG | |
| 89 JS::RootedObject cacheResult(cx); | |
| 90 #endif | |
| 91 JS::RootedValue v(cx, vp); | |
| 92 if (js::WrapperMap::Ptr p = crossCompartmentWrappers.lookup(v)) { | |
| 93 #ifdef DEBUG | |
| 94 cacheResult = &p->value().get().toObject(); | |
| 95 #else | |
| 96 vp.set(p->value()); | |
| 97 return true; | |
| 98 #endif | |
| 99 } | |
| 100 | |
| 101 JS::RootedObject obj(cx, &vp.toObject()); | |
| 102 if (!wrap(cx, &obj, existing)) | |
| 103 return false; | |
| 104 vp.setObject(*obj); | |
| 105 JS_ASSERT_IF(cacheResult, obj == cacheResult); | |
| 106 return true; | |
| 107 } | |
| 108 | |
| 109 #endif /* jscompartmentinlines_h */ |
