mirror of
https://gitlab.winehq.org/wine/wine-gecko.git
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692 lines
28 KiB
C++
692 lines
28 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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* vim: set ts=8 sts=4 et sw=4 tw=99:
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef js_Proxy_h
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#define js_Proxy_h
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#include "mozilla/Maybe.h"
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#include "jsfriendapi.h"
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#include "js/CallNonGenericMethod.h"
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#include "js/Class.h"
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namespace js {
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using JS::AutoIdVector;
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using JS::CallArgs;
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using JS::Handle;
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using JS::HandleId;
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using JS::HandleObject;
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using JS::HandleValue;
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using JS::IsAcceptableThis;
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using JS::MutableHandle;
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using JS::MutableHandleObject;
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using JS::MutableHandleValue;
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using JS::NativeImpl;
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using JS::ObjectOpResult;
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using JS::PrivateValue;
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using JS::Value;
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class RegExpGuard;
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class JS_FRIEND_API(Wrapper);
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/*
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* A proxy is a JSObject with highly customizable behavior. ES6 specifies a
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* single kind of proxy, but the customization mechanisms we use to implement
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* ES6 Proxy objects are also useful wherever an object with weird behavior is
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* wanted. Proxies are used to implement:
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*
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* - the scope objects used by the Debugger's frame.eval() method
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* (see js::GetDebugScopeForFunction)
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*
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* - the khuey hack, whereby a whole compartment can be blown away
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* even if other compartments hold references to objects in it
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* (see js::NukeCrossCompartmentWrappers)
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*
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* - XPConnect security wrappers, which protect chrome from malicious content
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* (js/xpconnect/wrappers)
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*
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* - DOM objects with special property behavior, like named getters
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* (dom/bindings/Codegen.py generates these proxies from WebIDL)
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*
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* - semi-transparent use of objects that live in other processes
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* (CPOWs, implemented in js/ipc)
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*
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* ### Proxies and internal methods
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*
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* ES6 draft rev 27 (24 August 2014) specifies 14 internal methods. The runtime
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* semantics of just about everything a script can do to an object is specified
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* in terms of these internal methods. For example:
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*
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* JS code ES6 internal method that gets called
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* --------------------------- --------------------------------
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* obj.prop obj.[[Get]](obj, "prop")
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* "prop" in obj obj.[[HasProperty]]("prop")
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* new obj() obj.[[Construct]](<empty argument List>)
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* for (k in obj) {} obj.[[Enumerate]]()
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*
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* With regard to the implementation of these internal methods, there are three
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* very different kinds of object in SpiderMonkey.
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*
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* 1. Native objects' internal methods are implemented in vm/NativeObject.cpp,
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* with duplicate (but functionally identical) implementations scattered
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* through the ICs and JITs.
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*
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* 2. Certain non-native objects have internal methods that are implemented as
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* magical js::ObjectOps hooks. We're trying to get rid of these.
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*
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* 3. All other objects are proxies. A proxy's internal methods are
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* implemented in C++, as the virtual methods of a C++ object stored on the
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* proxy, known as its handler.
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*
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* This means that just about anything you do to a proxy will end up going
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* through a C++ virtual method call. Possibly several. There's no reason the
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* JITs and ICs can't specialize for particular proxies, based on the handler;
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* but currently we don't do much of this, so the virtual method overhead
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* typically is actually incurred.
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*
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* ### The proxy handler hierarchy
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*
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* A major use case for proxies is to forward each internal method call to
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* another object, known as its target. The target can be an arbitrary JS
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* object. Not every proxy has the notion of a target, however.
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*
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* To minimize code duplication, a set of abstract proxy handler classes is
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* provided, from which other handlers may inherit. These abstract classes are
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* organized in the following hierarchy:
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*
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* BaseProxyHandler
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* |
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* DirectProxyHandler // has a target
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* |
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* Wrapper // can be unwrapped, revealing target
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* | // (see js::CheckedUnwrap)
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* |
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* CrossCompartmentWrapper // target is in another compartment;
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* // implements membrane between compartments
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*
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* Example: Some DOM objects (including all the arraylike DOM objects) are
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* implemented as proxies. Since these objects don't need to forward operations
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* to any underlying JS object, DOMJSProxyHandler directly subclasses
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* BaseProxyHandler.
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*
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* Gecko's security wrappers are examples of cross-compartment wrappers.
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*
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* ### Proxy prototype chains
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*
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* In addition to the normal methods, there are two models for proxy prototype
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* chains.
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*
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* 1. Proxies can use the standard prototype mechanism used throughout the
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* engine. To do so, simply pass a prototype to NewProxyObject() at
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* creation time. All prototype accesses will then "just work" to treat the
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* proxy as a "normal" object.
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*
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* 2. A proxy can implement more complicated prototype semantics (if, for
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* example, it wants to delegate the prototype lookup to a wrapped object)
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* by passing Proxy::LazyProto as the prototype at create time. This
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* guarantees that the getPrototype() handler method will be called every
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* time the object's prototype chain is accessed.
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*
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* This system is implemented with two methods: {get,set}Prototype. The
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* default implementation of setPrototype throws a TypeError. Since it is
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* not possible to create an object without a sense of prototype chain,
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* handlers must implement getPrototype if opting in to the dynamic
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* prototype system.
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*/
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/*
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* BaseProxyHandler is the most generic kind of proxy handler. It does not make
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* any assumptions about the target. Consequently, it does not provide any
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* default implementation for most methods. As a convenience, a few high-level
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* methods, like get() and set(), are given default implementations that work by
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* calling the low-level methods, like getOwnPropertyDescriptor().
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*
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* Important: If you add a method here, you should probably also add a
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* Proxy::foo entry point with an AutoEnterPolicy. If you don't, you need an
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* explicit override for the method in SecurityWrapper. See bug 945826 comment 0.
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*/
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class JS_FRIEND_API(BaseProxyHandler)
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{
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/*
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* Sometimes it's desirable to designate groups of proxy handlers as "similar".
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* For this, we use the notion of a "family": A consumer-provided opaque pointer
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* that designates the larger group to which this proxy belongs.
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*
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* If it will never be important to differentiate this proxy from others as
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* part of a distinct group, nullptr may be used instead.
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*/
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const void* mFamily;
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/*
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* Proxy handlers can use mHasPrototype to request the following special
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* treatment from the JS engine:
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*
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* - When mHasPrototype is true, the engine never calls these methods:
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* getPropertyDescriptor, has, set, enumerate, iterate. Instead, for
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* these operations, it calls the "own" methods like
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* getOwnPropertyDescriptor, hasOwn, defineProperty,
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* getOwnEnumerablePropertyKeys, etc., and consults the prototype chain
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* if needed.
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*
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* - When mHasPrototype is true, the engine calls handler->get() only if
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* handler->hasOwn() says an own property exists on the proxy. If not,
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* it consults the prototype chain.
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*
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* This is useful because it frees the ProxyHandler from having to implement
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* any behavior having to do with the prototype chain.
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*/
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bool mHasPrototype;
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/*
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* All proxies indicate whether they have any sort of interesting security
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* policy that might prevent the caller from doing something it wants to
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* the object. In the case of wrappers, this distinction is used to
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* determine whether the caller may strip off the wrapper if it so desires.
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*/
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bool mHasSecurityPolicy;
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public:
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explicit MOZ_CONSTEXPR BaseProxyHandler(const void* aFamily, bool aHasPrototype = false,
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bool aHasSecurityPolicy = false)
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: mFamily(aFamily),
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mHasPrototype(aHasPrototype),
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mHasSecurityPolicy(aHasSecurityPolicy)
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{ }
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bool hasPrototype() const {
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return mHasPrototype;
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}
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bool hasSecurityPolicy() const {
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return mHasSecurityPolicy;
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}
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inline const void* family() const {
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return mFamily;
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}
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static size_t offsetOfFamily() {
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return offsetof(BaseProxyHandler, mFamily);
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}
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virtual bool finalizeInBackground(Value priv) const {
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/*
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* Called on creation of a proxy to determine whether its finalize
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* method can be finalized on the background thread.
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*/
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return true;
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}
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/* Policy enforcement methods.
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*
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* enter() allows the policy to specify whether the caller may perform |act|
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* on the proxy's |id| property. In the case when |act| is CALL, |id| is
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* generally JSID_VOID.
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*
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* The |act| parameter to enter() specifies the action being performed.
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* If |bp| is false, the method suggests that the caller throw (though it
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* may still decide to squelch the error).
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*
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* We make these OR-able so that assertEnteredPolicy can pass a union of them.
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* For example, get{,Own}PropertyDescriptor is invoked by calls to ::get()
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* ::set(), in addition to being invoked on its own, so there are several
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* valid Actions that could have been entered.
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*/
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typedef uint32_t Action;
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enum {
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NONE = 0x00,
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GET = 0x01,
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SET = 0x02,
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CALL = 0x04,
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ENUMERATE = 0x08,
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GET_PROPERTY_DESCRIPTOR = 0x10
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};
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virtual bool enter(JSContext* cx, HandleObject wrapper, HandleId id, Action act,
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bool* bp) const;
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/* Standard internal methods. */
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virtual bool getOwnPropertyDescriptor(JSContext* cx, HandleObject proxy, HandleId id,
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MutableHandle<JSPropertyDescriptor> desc) const = 0;
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virtual bool defineProperty(JSContext* cx, HandleObject proxy, HandleId id,
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Handle<JSPropertyDescriptor> desc,
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ObjectOpResult& result) const = 0;
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virtual bool ownPropertyKeys(JSContext* cx, HandleObject proxy,
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AutoIdVector& props) const = 0;
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virtual bool delete_(JSContext* cx, HandleObject proxy, HandleId id,
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ObjectOpResult& result) const = 0;
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/*
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* Because [[Enumerate]] is one of the standard traps it should be overridden.
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* However for convenience BaseProxyHandler includes a pure virtual implementation,
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* that turns the properties returned by getOwnEnumerablePropertyKeys (and proto walking)
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* into an Iterator object.
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*/
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virtual bool enumerate(JSContext* cx, HandleObject proxy, MutableHandleObject objp) const = 0;
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/*
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* These methods are standard, but the engine does not normally call them.
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* They're opt-in. See "Proxy prototype chains" above.
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*
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* getPrototype() crashes if called. setPrototype() throws a TypeError.
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*/
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virtual bool getPrototype(JSContext* cx, HandleObject proxy, MutableHandleObject protop) const;
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virtual bool setPrototype(JSContext* cx, HandleObject proxy, HandleObject proto,
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ObjectOpResult& result) const;
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/* Non-standard but conceptual kin to {g,s}etPrototype, so lives here. */
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virtual bool setImmutablePrototype(JSContext* cx, HandleObject proxy, bool* succeeded) const;
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virtual bool preventExtensions(JSContext* cx, HandleObject proxy,
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ObjectOpResult& result) const = 0;
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virtual bool isExtensible(JSContext* cx, HandleObject proxy, bool* extensible) const = 0;
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/*
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* These standard internal methods are implemented, as a convenience, so
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* that ProxyHandler subclasses don't have to provide every single method.
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*
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* The base-class implementations work by calling getPropertyDescriptor().
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* They do not follow any standard. When in doubt, override them.
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*/
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virtual bool has(JSContext* cx, HandleObject proxy, HandleId id, bool* bp) const;
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virtual bool get(JSContext* cx, HandleObject proxy, HandleObject receiver,
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HandleId id, MutableHandleValue vp) const;
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virtual bool set(JSContext* cx, HandleObject proxy, HandleId id, HandleValue v,
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HandleValue receiver, ObjectOpResult& result) const;
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/*
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* [[Call]] and [[Construct]] are standard internal methods but according
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* to the spec, they are not present on every object.
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*
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* SpiderMonkey never calls a proxy's call()/construct() internal method
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* unless isCallable()/isConstructor() returns true for that proxy.
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*
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* BaseProxyHandler::isCallable()/isConstructor() always return false, and
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* BaseProxyHandler::call()/construct() crash if called. So if you're
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* creating a kind of that is never callable, you don't have to override
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* anything, but otherwise you probably want to override all four.
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*/
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virtual bool call(JSContext* cx, HandleObject proxy, const CallArgs& args) const;
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virtual bool construct(JSContext* cx, HandleObject proxy, const CallArgs& args) const;
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/* SpiderMonkey extensions. */
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virtual bool getPropertyDescriptor(JSContext* cx, HandleObject proxy, HandleId id,
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MutableHandle<JSPropertyDescriptor> desc) const = 0;
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virtual bool hasOwn(JSContext* cx, HandleObject proxy, HandleId id, bool* bp) const;
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virtual bool getOwnEnumerablePropertyKeys(JSContext* cx, HandleObject proxy,
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AutoIdVector& props) const;
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virtual bool nativeCall(JSContext* cx, IsAcceptableThis test, NativeImpl impl, CallArgs args) const;
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virtual bool hasInstance(JSContext* cx, HandleObject proxy, MutableHandleValue v, bool* bp) const;
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virtual bool objectClassIs(HandleObject obj, ESClassValue classValue, JSContext* cx) const;
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virtual const char* className(JSContext* cx, HandleObject proxy) const;
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virtual JSString* fun_toString(JSContext* cx, HandleObject proxy, unsigned indent) const;
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virtual bool regexp_toShared(JSContext* cx, HandleObject proxy, RegExpGuard* g) const;
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virtual bool boxedValue_unbox(JSContext* cx, HandleObject proxy, MutableHandleValue vp) const;
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virtual bool defaultValue(JSContext* cx, HandleObject obj, JSType hint, MutableHandleValue vp) const;
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virtual void trace(JSTracer* trc, JSObject* proxy) const;
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virtual void finalize(JSFreeOp* fop, JSObject* proxy) const;
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virtual void objectMoved(JSObject* proxy, const JSObject* old) const;
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// Allow proxies, wrappers in particular, to specify callability at runtime.
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// Note: These do not take const JSObject*, but they do in spirit.
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// We are not prepared to do this, as there's little const correctness
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// in the external APIs that handle proxies.
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virtual bool isCallable(JSObject* obj) const;
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virtual bool isConstructor(JSObject* obj) const;
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// These two hooks must be overridden, or not overridden, in tandem -- no
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// overriding just one!
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virtual bool watch(JSContext* cx, JS::HandleObject proxy, JS::HandleId id,
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JS::HandleObject callable) const;
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virtual bool unwatch(JSContext* cx, JS::HandleObject proxy, JS::HandleId id) const;
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virtual bool getElements(JSContext* cx, HandleObject proxy, uint32_t begin, uint32_t end,
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ElementAdder* adder) const;
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/* See comment for weakmapKeyDelegateOp in js/Class.h. */
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virtual JSObject* weakmapKeyDelegate(JSObject* proxy) const;
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virtual bool isScripted() const { return false; }
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};
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/*
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* DirectProxyHandler includes a notion of a target object. All methods are
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* reimplemented such that they forward their behavior to the target. This
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* allows consumers of this class to forward to another object as transparently
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* and efficiently as possible.
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*
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* Important: If you add a method implementation here, you probably also need
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* to add an override in CrossCompartmentWrapper. If you don't, you risk
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* compartment mismatches. See bug 945826 comment 0.
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*/
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class JS_FRIEND_API(DirectProxyHandler) : public BaseProxyHandler
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{
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public:
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explicit MOZ_CONSTEXPR DirectProxyHandler(const void* aFamily, bool aHasPrototype = false,
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bool aHasSecurityPolicy = false)
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: BaseProxyHandler(aFamily, aHasPrototype, aHasSecurityPolicy)
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{ }
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/* Standard internal methods. */
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virtual bool getOwnPropertyDescriptor(JSContext* cx, HandleObject proxy, HandleId id,
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MutableHandle<JSPropertyDescriptor> desc) const override;
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virtual bool defineProperty(JSContext* cx, HandleObject proxy, HandleId id,
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Handle<JSPropertyDescriptor> desc,
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ObjectOpResult& result) const override;
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virtual bool ownPropertyKeys(JSContext* cx, HandleObject proxy,
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AutoIdVector& props) const override;
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virtual bool delete_(JSContext* cx, HandleObject proxy, HandleId id,
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ObjectOpResult& result) const override;
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virtual bool enumerate(JSContext* cx, HandleObject proxy,
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MutableHandleObject objp) const override;
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virtual bool getPrototype(JSContext* cx, HandleObject proxy,
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MutableHandleObject protop) const override;
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virtual bool setPrototype(JSContext* cx, HandleObject proxy, HandleObject proto,
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ObjectOpResult& result) const override;
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virtual bool setImmutablePrototype(JSContext* cx, HandleObject proxy,
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bool* succeeded) const override;
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virtual bool preventExtensions(JSContext* cx, HandleObject proxy,
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ObjectOpResult& result) const override;
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virtual bool isExtensible(JSContext* cx, HandleObject proxy, bool* extensible) const override;
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virtual bool has(JSContext* cx, HandleObject proxy, HandleId id,
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bool* bp) const override;
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virtual bool get(JSContext* cx, HandleObject proxy, HandleObject receiver,
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HandleId id, MutableHandleValue vp) const override;
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virtual bool set(JSContext* cx, HandleObject proxy, HandleId id, HandleValue v,
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HandleValue receiver, ObjectOpResult& result) const override;
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virtual bool call(JSContext* cx, HandleObject proxy, const CallArgs& args) const override;
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virtual bool construct(JSContext* cx, HandleObject proxy, const CallArgs& args) const override;
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/* SpiderMonkey extensions. */
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virtual bool getPropertyDescriptor(JSContext* cx, HandleObject proxy, HandleId id,
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MutableHandle<JSPropertyDescriptor> desc) const override;
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virtual bool hasOwn(JSContext* cx, HandleObject proxy, HandleId id,
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bool* bp) const override;
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virtual bool getOwnEnumerablePropertyKeys(JSContext* cx, HandleObject proxy,
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AutoIdVector& props) const override;
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virtual bool nativeCall(JSContext* cx, IsAcceptableThis test, NativeImpl impl,
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CallArgs args) const override;
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virtual bool hasInstance(JSContext* cx, HandleObject proxy, MutableHandleValue v,
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bool* bp) const override;
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virtual bool objectClassIs(HandleObject obj, ESClassValue classValue,
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JSContext* cx) const override;
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virtual const char* className(JSContext* cx, HandleObject proxy) const override;
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virtual JSString* fun_toString(JSContext* cx, HandleObject proxy,
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unsigned indent) const override;
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virtual bool regexp_toShared(JSContext* cx, HandleObject proxy,
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RegExpGuard* g) const override;
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virtual bool boxedValue_unbox(JSContext* cx, HandleObject proxy, MutableHandleValue vp) const override;
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virtual bool isCallable(JSObject* obj) const override;
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virtual JSObject* weakmapKeyDelegate(JSObject* proxy) const override;
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};
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extern JS_FRIEND_DATA(const js::Class* const) ProxyClassPtr;
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inline bool IsProxy(JSObject* obj)
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{
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return GetObjectClass(obj)->isProxy();
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}
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const uint32_t PROXY_EXTRA_SLOTS = 2;
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// Layout of the values stored by a proxy. Note that API clients require the
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// private slot to be the first slot in the proxy's values, so that the private
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// slot can be accessed in the same fashion as the first reserved slot, via
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// {Get,Set}ReservedOrProxyPrivateSlot.
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struct ProxyValueArray
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{
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Value privateSlot;
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Value extraSlots[PROXY_EXTRA_SLOTS];
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ProxyValueArray()
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: privateSlot(JS::UndefinedValue())
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{
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for (size_t i = 0; i < PROXY_EXTRA_SLOTS; i++)
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extraSlots[i] = JS::UndefinedValue();
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}
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};
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// All proxies share the same data layout. Following the object's shape and
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// type, the proxy has a ProxyDataLayout structure with a pointer to an array
|
|
// of values and the proxy's handler. This is designed both so that proxies can
|
|
// be easily swapped with other objects (via RemapWrapper) and to mimic the
|
|
// layout of other objects (proxies and other objects have the same size) so
|
|
// that common code can access either type of object.
|
|
//
|
|
// See GetReservedOrProxyPrivateSlot below.
|
|
struct ProxyDataLayout
|
|
{
|
|
ProxyValueArray* values;
|
|
const BaseProxyHandler* handler;
|
|
};
|
|
|
|
const uint32_t ProxyDataOffset = 2 * sizeof(void*);
|
|
|
|
// This method should only be used internally and by the accessors below.
|
|
inline ProxyDataLayout*
|
|
GetProxyDataLayout(JSObject* obj)
|
|
{
|
|
MOZ_ASSERT(IsProxy(obj));
|
|
return reinterpret_cast<ProxyDataLayout*>(reinterpret_cast<uint8_t*>(obj) + ProxyDataOffset);
|
|
}
|
|
|
|
inline const BaseProxyHandler*
|
|
GetProxyHandler(JSObject* obj)
|
|
{
|
|
return GetProxyDataLayout(obj)->handler;
|
|
}
|
|
|
|
inline const Value&
|
|
GetProxyPrivate(JSObject* obj)
|
|
{
|
|
return GetProxyDataLayout(obj)->values->privateSlot;
|
|
}
|
|
|
|
inline JSObject*
|
|
GetProxyTargetObject(JSObject* obj)
|
|
{
|
|
return GetProxyPrivate(obj).toObjectOrNull();
|
|
}
|
|
|
|
inline const Value&
|
|
GetProxyExtra(JSObject* obj, size_t n)
|
|
{
|
|
MOZ_ASSERT(n < PROXY_EXTRA_SLOTS);
|
|
return GetProxyDataLayout(obj)->values->extraSlots[n];
|
|
}
|
|
|
|
inline void
|
|
SetProxyHandler(JSObject* obj, const BaseProxyHandler* handler)
|
|
{
|
|
GetProxyDataLayout(obj)->handler = handler;
|
|
}
|
|
|
|
JS_FRIEND_API(void)
|
|
SetValueInProxy(Value* slot, const Value& value);
|
|
|
|
inline void
|
|
SetProxyExtra(JSObject* obj, size_t n, const Value& extra)
|
|
{
|
|
MOZ_ASSERT(n < PROXY_EXTRA_SLOTS);
|
|
Value* vp = &GetProxyDataLayout(obj)->values->extraSlots[n];
|
|
|
|
// Trigger a barrier before writing the slot.
|
|
if (vp->isMarkable() || extra.isMarkable())
|
|
SetValueInProxy(vp, extra);
|
|
else
|
|
*vp = extra;
|
|
}
|
|
|
|
inline bool
|
|
IsScriptedProxy(JSObject* obj)
|
|
{
|
|
return IsProxy(obj) && GetProxyHandler(obj)->isScripted();
|
|
}
|
|
|
|
inline const Value&
|
|
GetReservedOrProxyPrivateSlot(JSObject* obj, size_t slot)
|
|
{
|
|
MOZ_ASSERT(slot == 0);
|
|
MOZ_ASSERT(slot < JSCLASS_RESERVED_SLOTS(GetObjectClass(obj)) || IsProxy(obj));
|
|
return reinterpret_cast<const shadow::Object*>(obj)->slotRef(slot);
|
|
}
|
|
|
|
inline void
|
|
SetReservedOrProxyPrivateSlot(JSObject* obj, size_t slot, const Value& value)
|
|
{
|
|
MOZ_ASSERT(slot == 0);
|
|
MOZ_ASSERT(slot < JSCLASS_RESERVED_SLOTS(GetObjectClass(obj)) || IsProxy(obj));
|
|
shadow::Object* sobj = reinterpret_cast<shadow::Object*>(obj);
|
|
if (sobj->slotRef(slot).isMarkable() || value.isMarkable())
|
|
SetReservedOrProxyPrivateSlotWithBarrier(obj, slot, value);
|
|
else
|
|
sobj->slotRef(slot) = value;
|
|
}
|
|
|
|
class MOZ_STACK_CLASS ProxyOptions {
|
|
protected:
|
|
/* protected constructor for subclass */
|
|
explicit ProxyOptions(bool singletonArg, bool lazyProtoArg = false)
|
|
: singleton_(singletonArg),
|
|
lazyProto_(lazyProtoArg),
|
|
clasp_(ProxyClassPtr)
|
|
{}
|
|
|
|
public:
|
|
ProxyOptions() : singleton_(false),
|
|
lazyProto_(false),
|
|
clasp_(ProxyClassPtr)
|
|
{}
|
|
|
|
bool singleton() const { return singleton_; }
|
|
ProxyOptions& setSingleton(bool flag) {
|
|
singleton_ = flag;
|
|
return *this;
|
|
}
|
|
|
|
bool lazyProto() const { return lazyProto_; }
|
|
ProxyOptions& setLazyProto(bool flag) {
|
|
lazyProto_ = flag;
|
|
return *this;
|
|
}
|
|
|
|
const Class* clasp() const {
|
|
return clasp_;
|
|
}
|
|
ProxyOptions& setClass(const Class* claspArg) {
|
|
clasp_ = claspArg;
|
|
return *this;
|
|
}
|
|
|
|
private:
|
|
bool singleton_;
|
|
bool lazyProto_;
|
|
const Class* clasp_;
|
|
};
|
|
|
|
JS_FRIEND_API(JSObject*)
|
|
NewProxyObject(JSContext* cx, const BaseProxyHandler* handler, HandleValue priv,
|
|
JSObject* proto, const ProxyOptions& options = ProxyOptions());
|
|
|
|
JSObject*
|
|
RenewProxyObject(JSContext* cx, JSObject* obj, BaseProxyHandler* handler, Value priv);
|
|
|
|
class JS_FRIEND_API(AutoEnterPolicy)
|
|
{
|
|
public:
|
|
typedef BaseProxyHandler::Action Action;
|
|
AutoEnterPolicy(JSContext* cx, const BaseProxyHandler* handler,
|
|
HandleObject wrapper, HandleId id, Action act, bool mayThrow)
|
|
#ifdef JS_DEBUG
|
|
: context(nullptr)
|
|
#endif
|
|
{
|
|
allow = handler->hasSecurityPolicy() ? handler->enter(cx, wrapper, id, act, &rv)
|
|
: true;
|
|
recordEnter(cx, wrapper, id, act);
|
|
// We want to throw an exception if all of the following are true:
|
|
// * The policy disallowed access.
|
|
// * The policy set rv to false, indicating that we should throw.
|
|
// * The caller did not instruct us to ignore exceptions.
|
|
// * The policy did not throw itself.
|
|
if (!allow && !rv && mayThrow)
|
|
reportErrorIfExceptionIsNotPending(cx, id);
|
|
}
|
|
|
|
virtual ~AutoEnterPolicy() { recordLeave(); }
|
|
inline bool allowed() { return allow; }
|
|
inline bool returnValue() { MOZ_ASSERT(!allowed()); return rv; }
|
|
|
|
protected:
|
|
// no-op constructor for subclass
|
|
AutoEnterPolicy()
|
|
#ifdef JS_DEBUG
|
|
: context(nullptr)
|
|
, enteredAction(BaseProxyHandler::NONE)
|
|
#endif
|
|
{}
|
|
void reportErrorIfExceptionIsNotPending(JSContext* cx, jsid id);
|
|
bool allow;
|
|
bool rv;
|
|
|
|
#ifdef JS_DEBUG
|
|
JSContext* context;
|
|
mozilla::Maybe<HandleObject> enteredProxy;
|
|
mozilla::Maybe<HandleId> enteredId;
|
|
Action enteredAction;
|
|
|
|
// NB: We explicitly don't track the entered action here, because sometimes
|
|
// set() methods do an implicit get() during their implementation, leading
|
|
// to spurious assertions.
|
|
AutoEnterPolicy* prev;
|
|
void recordEnter(JSContext* cx, HandleObject proxy, HandleId id, Action act);
|
|
void recordLeave();
|
|
|
|
friend JS_FRIEND_API(void) assertEnteredPolicy(JSContext* cx, JSObject* proxy, jsid id, Action act);
|
|
#else
|
|
inline void recordEnter(JSContext* cx, JSObject* proxy, jsid id, Action act) {}
|
|
inline void recordLeave() {}
|
|
#endif
|
|
|
|
};
|
|
|
|
#ifdef JS_DEBUG
|
|
class JS_FRIEND_API(AutoWaivePolicy) : public AutoEnterPolicy {
|
|
public:
|
|
AutoWaivePolicy(JSContext* cx, HandleObject proxy, HandleId id,
|
|
BaseProxyHandler::Action act)
|
|
{
|
|
allow = true;
|
|
recordEnter(cx, proxy, id, act);
|
|
}
|
|
};
|
|
#else
|
|
class JS_FRIEND_API(AutoWaivePolicy) {
|
|
public:
|
|
AutoWaivePolicy(JSContext* cx, HandleObject proxy, HandleId id,
|
|
BaseProxyHandler::Action act)
|
|
{}
|
|
};
|
|
#endif
|
|
|
|
#ifdef JS_DEBUG
|
|
extern JS_FRIEND_API(void)
|
|
assertEnteredPolicy(JSContext* cx, JSObject* obj, jsid id,
|
|
BaseProxyHandler::Action act);
|
|
#else
|
|
inline void assertEnteredPolicy(JSContext* cx, JSObject* obj, jsid id,
|
|
BaseProxyHandler::Action act)
|
|
{}
|
|
#endif
|
|
|
|
extern JS_FRIEND_API(JSObject*)
|
|
InitProxyClass(JSContext* cx, JS::HandleObject obj);
|
|
|
|
} /* namespace js */
|
|
|
|
#endif /* js_Proxy_h */
|