mirror of
https://github.com/mozilla/gecko-dev.git
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231 lines
8.1 KiB
C++
231 lines
8.1 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-*/
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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 file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_dom_DOMJSProxyHandler_h
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#define mozilla_dom_DOMJSProxyHandler_h
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#include "mozilla/Attributes.h"
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#include "mozilla/Likely.h"
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#include "jsapi.h"
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#include "jsproxy.h"
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#include "nsString.h"
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#define DOM_PROXY_OBJECT_SLOT js::PROXY_PRIVATE_SLOT
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namespace mozilla {
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namespace dom {
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enum {
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JSPROXYSLOT_EXPANDO = 0
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};
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template<typename T> struct Prefable;
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// This variable exists solely to provide a unique address for use as an identifier.
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extern const char HandlerFamily;
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inline const void* ProxyFamily() { return &HandlerFamily; }
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inline bool IsDOMProxy(JSObject *obj)
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{
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const js::Class* clasp = js::GetObjectClass(obj);
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return clasp->isProxy() &&
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js::GetProxyHandler(obj)->family() == ProxyFamily();
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}
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class BaseDOMProxyHandler : public js::BaseProxyHandler
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{
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public:
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explicit BaseDOMProxyHandler(const void* aProxyFamily, bool aHasPrototype = false)
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: js::BaseProxyHandler(aProxyFamily, aHasPrototype)
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{}
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// Implementations of traps that can be implemented in terms of
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// fundamental traps.
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bool enumerate(JSContext* cx, JS::Handle<JSObject*> proxy,
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JS::AutoIdVector& props) const MOZ_OVERRIDE;
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bool getPropertyDescriptor(JSContext* cx, JS::Handle<JSObject*> proxy,
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JS::Handle<jsid> id,
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JS::MutableHandle<JSPropertyDescriptor> desc) const MOZ_OVERRIDE;
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bool getOwnPropertyDescriptor(JSContext* cx, JS::Handle<JSObject*> proxy,
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JS::Handle<jsid> id,
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JS::MutableHandle<JSPropertyDescriptor> desc) const MOZ_OVERRIDE;
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bool watch(JSContext* cx, JS::Handle<JSObject*> proxy, JS::Handle<jsid> id,
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JS::Handle<JSObject*> callable) const MOZ_OVERRIDE;
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bool unwatch(JSContext* cx, JS::Handle<JSObject*> proxy,
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JS::Handle<jsid> id) const MOZ_OVERRIDE;
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virtual bool getOwnPropertyNames(JSContext* cx, JS::Handle<JSObject*> proxy,
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JS::AutoIdVector &props) const MOZ_OVERRIDE;
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// We override keys() and implement it directly instead of using the
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// default implementation, which would getOwnPropertyNames and then
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// filter out the non-enumerable ones. This avoids doing
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// unnecessary work during enumeration.
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virtual bool keys(JSContext* cx, JS::Handle<JSObject*> proxy,
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JS::AutoIdVector &props) const MOZ_OVERRIDE;
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protected:
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// Hook for subclasses to implement shared getOwnPropertyNames()/keys()
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// functionality. The "flags" argument is either JSITER_OWNONLY (for keys())
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// or JSITER_OWNONLY | JSITER_HIDDEN (for getOwnPropertyNames()).
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virtual bool ownPropNames(JSContext* cx, JS::Handle<JSObject*> proxy,
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unsigned flags,
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JS::AutoIdVector& props) const = 0;
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// Hook for subclasses to allow set() to ignore named props while other things
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// that look at property descriptors see them. This is intentionally not
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// named getOwnPropertyDescriptor to avoid subclasses that override it hiding
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// our public getOwnPropertyDescriptor.
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virtual bool getOwnPropDescriptor(JSContext* cx,
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JS::Handle<JSObject*> proxy,
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JS::Handle<jsid> id,
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bool ignoreNamedProps,
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JS::MutableHandle<JSPropertyDescriptor> desc) const = 0;
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};
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class DOMProxyHandler : public BaseDOMProxyHandler
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{
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public:
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DOMProxyHandler()
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: BaseDOMProxyHandler(ProxyFamily())
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{
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}
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bool preventExtensions(JSContext *cx, JS::Handle<JSObject*> proxy) const MOZ_OVERRIDE;
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bool defineProperty(JSContext* cx, JS::Handle<JSObject*> proxy, JS::Handle<jsid> id,
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JS::MutableHandle<JSPropertyDescriptor> desc) const MOZ_OVERRIDE
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{
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bool unused;
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return defineProperty(cx, proxy, id, desc, &unused);
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}
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virtual bool defineProperty(JSContext* cx, JS::Handle<JSObject*> proxy, JS::Handle<jsid> id,
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JS::MutableHandle<JSPropertyDescriptor> desc, bool* defined)
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const;
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bool set(JSContext *cx, JS::Handle<JSObject*> proxy, JS::Handle<JSObject*> receiver,
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JS::Handle<jsid> id, bool strict, JS::MutableHandle<JS::Value> vp)
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const MOZ_OVERRIDE;
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bool delete_(JSContext* cx, JS::Handle<JSObject*> proxy,
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JS::Handle<jsid> id, bool* bp) const MOZ_OVERRIDE;
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bool has(JSContext* cx, JS::Handle<JSObject*> proxy, JS::Handle<jsid> id,
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bool* bp) const MOZ_OVERRIDE;
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bool isExtensible(JSContext *cx, JS::Handle<JSObject*> proxy, bool *extensible)
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const MOZ_OVERRIDE;
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/*
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* If assigning to proxy[id] hits a named setter with OverrideBuiltins or
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* an indexed setter, call it and set *done to true on success. Otherwise, set
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* *done to false.
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*/
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virtual bool setCustom(JSContext* cx, JS::Handle<JSObject*> proxy, JS::Handle<jsid> id,
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JS::MutableHandle<JS::Value> vp, bool *done) const;
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static JSObject* GetExpandoObject(JSObject* obj)
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{
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MOZ_ASSERT(IsDOMProxy(obj), "expected a DOM proxy object");
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JS::Value v = js::GetProxyExtra(obj, JSPROXYSLOT_EXPANDO);
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if (v.isObject()) {
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return &v.toObject();
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}
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if (v.isUndefined()) {
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return nullptr;
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}
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js::ExpandoAndGeneration* expandoAndGeneration =
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static_cast<js::ExpandoAndGeneration*>(v.toPrivate());
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v = expandoAndGeneration->expando;
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return v.isUndefined() ? nullptr : &v.toObject();
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}
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/* GetAndClearExpandoObject does not DROP or clear the preserving wrapper flag. */
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static JSObject* GetAndClearExpandoObject(JSObject* obj);
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static JSObject* EnsureExpandoObject(JSContext* cx,
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JS::Handle<JSObject*> obj);
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};
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inline const DOMProxyHandler*
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GetDOMProxyHandler(JSObject* obj)
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{
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MOZ_ASSERT(IsDOMProxy(obj));
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return static_cast<const DOMProxyHandler*>(js::GetProxyHandler(obj));
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}
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extern jsid s_length_id;
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int32_t IdToInt32(JSContext* cx, JS::Handle<jsid> id);
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// XXXbz this should really return uint32_t, with the maximum value
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// meaning "not an index"...
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inline int32_t
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GetArrayIndexFromId(JSContext* cx, JS::Handle<jsid> id)
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{
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if (MOZ_LIKELY(JSID_IS_INT(id))) {
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return JSID_TO_INT(id);
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}
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if (MOZ_LIKELY(id == s_length_id)) {
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return -1;
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}
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if (MOZ_LIKELY(JSID_IS_ATOM(id))) {
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JSAtom* atom = JSID_TO_ATOM(id);
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jschar s;
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{
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JS::AutoCheckCannotGC nogc;
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if (js::AtomHasLatin1Chars(atom)) {
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s = *js::GetLatin1AtomChars(nogc, atom);
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} else {
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s = *js::GetTwoByteAtomChars(nogc, atom);
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}
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}
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if (MOZ_LIKELY((unsigned)s >= 'a' && (unsigned)s <= 'z'))
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return -1;
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uint32_t i;
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JSLinearString* str = js::AtomToLinearString(JSID_TO_ATOM(id));
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return js::StringIsArrayIndex(str, &i) ? i : -1;
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}
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return IdToInt32(cx, id);
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}
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inline bool
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IsArrayIndex(int32_t index)
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{
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return index >= 0;
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}
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inline void
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FillPropertyDescriptor(JS::MutableHandle<JSPropertyDescriptor> desc,
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JSObject* obj, bool readonly, bool enumerable = true)
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{
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desc.object().set(obj);
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desc.setAttributes((readonly ? JSPROP_READONLY : 0) |
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(enumerable ? JSPROP_ENUMERATE : 0));
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desc.setGetter(nullptr);
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desc.setSetter(nullptr);
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}
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inline void
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FillPropertyDescriptor(JS::MutableHandle<JSPropertyDescriptor> desc,
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JSObject* obj, JS::Value v,
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bool readonly, bool enumerable = true)
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{
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desc.value().set(v);
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FillPropertyDescriptor(desc, obj, readonly, enumerable);
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}
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inline void
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FillPropertyDescriptor(JS::MutableHandle<JSPropertyDescriptor> desc,
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JSObject* obj, unsigned attributes, JS::Value v)
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{
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desc.object().set(obj);
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desc.value().set(v);
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desc.setAttributes(attributes);
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desc.setGetter(nullptr);
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desc.setSetter(nullptr);
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}
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} // namespace dom
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} // namespace mozilla
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#endif /* mozilla_dom_DOMProxyHandler_h */
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