зеркало из https://github.com/mozilla/gecko-dev.git
Bug 1257102 - Invoking a trap on a proxy, where the handler has null as the value of that trap, should fall back to operating on the target just like undefined would. r=evilpie
--HG-- extra : rebase_source : b77e0d98e710345192e95d4128fc82963dba403b
This commit is contained in:
Jeff Walden
Родитель
f3dc22db8d
Коммит
4fceffbb3c
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@ -381,6 +381,7 @@ MSG_DEF(JSMSG_PROXY_EXTENSIBILITY, 0, JSEXN_TYPEERR, "proxy must report same
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MSG_DEF(JSMSG_PROXY_GETOWN_OBJORUNDEF, 0, JSEXN_TYPEERR, "proxy [[GetOwnProperty]] must return an object or undefined")
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MSG_DEF(JSMSG_PROXY_REVOKED, 0, JSEXN_TYPEERR, "illegal operation attempted on a revoked proxy")
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MSG_DEF(JSMSG_PROXY_ARG_REVOKED, 1, JSEXN_TYPEERR, "argument {0} cannot be a revoked proxy")
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MSG_DEF(JSMSG_BAD_TRAP, 1, JSEXN_TYPEERR, "proxy handler's {0} trap wasn't undefined, null, or callable")
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// Structured cloning
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MSG_DEF(JSMSG_SC_BAD_CLONE_VERSION, 0, JSEXN_ERR, "unsupported structured clone version")
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@ -128,6 +128,38 @@ GetDirectProxyHandlerObject(JSObject* proxy)
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return proxy->as<ProxyObject>().extra(ScriptedDirectProxyHandler::HANDLER_EXTRA).toObjectOrNull();
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}
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// ES7 rev 0c1bd3004329336774cbc90de727cd0cf5f11e93 7.3.9 GetMethod,
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// reimplemented for proxy handler trap-getting to produce better error
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// messages.
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static bool
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GetProxyTrap(JSContext* cx, HandleObject handler, HandlePropertyName name, MutableHandleValue func)
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{
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// Steps 2, 5.
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if (!GetProperty(cx, handler, handler, name, func))
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return false;
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// Step 3.
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if (func.isUndefined())
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return true;
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if (func.isNull()) {
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func.setUndefined();
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return true;
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}
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// Step 4.
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if (!IsCallable(func)) {
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JSAutoByteString bytes(cx, name);
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if (!bytes)
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return false;
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JS_ReportErrorNumber(cx, GetErrorMessage, nullptr, JSMSG_BAD_TRAP, bytes.ptr());
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return false;
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}
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return true;
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}
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// ES6 implements both getPrototype and setPrototype traps. We don't have them yet (see bug
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// 888969). For now, use these, to account for proxy revocation.
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bool
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@ -189,7 +221,7 @@ ScriptedDirectProxyHandler::preventExtensions(JSContext* cx, HandleObject proxy,
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// Steps 5-6.
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RootedValue trap(cx);
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if (!GetProperty(cx, handler, handler, cx->names().preventExtensions, &trap))
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if (!GetProxyTrap(cx, handler, cx->names().preventExtensions, &trap))
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return false;
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// Step 7.
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@ -237,7 +269,7 @@ ScriptedDirectProxyHandler::isExtensible(JSContext* cx, HandleObject proxy, bool
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// step 4-5
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RootedValue trap(cx);
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if (!GetProperty(cx, handler, handler, cx->names().isExtensible, &trap))
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if (!GetProxyTrap(cx, handler, cx->names().isExtensible, &trap))
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return false;
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// step 6
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@ -290,7 +322,7 @@ ScriptedDirectProxyHandler::getOwnPropertyDescriptor(JSContext* cx, HandleObject
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// step 5-6
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RootedValue trap(cx);
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if (!GetProperty(cx, handler, handler, cx->names().getOwnPropertyDescriptor, &trap))
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if (!GetProxyTrap(cx, handler, cx->names().getOwnPropertyDescriptor, &trap))
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return false;
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// step 7
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@ -410,7 +442,7 @@ ScriptedDirectProxyHandler::defineProperty(JSContext* cx, HandleObject proxy, Ha
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// steps 6-7
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RootedValue trap(cx);
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if (!GetProperty(cx, handler, handler, cx->names().defineProperty, &trap))
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if (!GetProxyTrap(cx, handler, cx->names().defineProperty, &trap))
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return false;
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// step 8
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@ -537,7 +569,7 @@ ScriptedDirectProxyHandler::ownPropertyKeys(JSContext* cx, HandleObject proxy,
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// Steps 5-6.
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RootedValue trap(cx);
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if (!GetProperty(cx, handler, handler, cx->names().ownKeys, &trap))
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if (!GetProxyTrap(cx, handler, cx->names().ownKeys, &trap))
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return false;
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// Step 7.
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@ -674,7 +706,7 @@ ScriptedDirectProxyHandler::delete_(JSContext* cx, HandleObject proxy, HandleId
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// steps 6-7
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RootedValue trap(cx);
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if (!GetProperty(cx, handler, handler, cx->names().deleteProperty, &trap))
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if (!GetProxyTrap(cx, handler, cx->names().deleteProperty, &trap))
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return false;
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// step 8
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@ -731,7 +763,7 @@ ScriptedDirectProxyHandler::has(JSContext* cx, HandleObject proxy, HandleId id,
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// step 5-6
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RootedValue trap(cx);
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if (!GetProperty(cx, handler, handler, cx->names().has, &trap))
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if (!GetProxyTrap(cx, handler, cx->names().has, &trap))
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return false;
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// step 7
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@ -799,7 +831,7 @@ ScriptedDirectProxyHandler::get(JSContext* cx, HandleObject proxy, HandleValue r
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// step 5-6
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RootedValue trap(cx);
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if (!GetProperty(cx, handler, handler, cx->names().get, &trap))
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if (!GetProxyTrap(cx, handler, cx->names().get, &trap))
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return false;
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// step 7
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@ -864,7 +896,7 @@ ScriptedDirectProxyHandler::set(JSContext* cx, HandleObject proxy, HandleId id,
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// step 5-7
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RootedObject target(cx, proxy->as<ProxyObject>().target());
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RootedValue trap(cx);
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if (!GetProperty(cx, handler, handler, cx->names().set, &trap))
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if (!GetProxyTrap(cx, handler, cx->names().set, &trap))
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return false;
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// step 8
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@ -940,7 +972,7 @@ ScriptedDirectProxyHandler::call(JSContext* cx, HandleObject proxy, const CallAr
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// step 4-5
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RootedValue trap(cx);
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if (!GetProperty(cx, handler, handler, cx->names().apply, &trap))
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if (!GetProxyTrap(cx, handler, cx->names().apply, &trap))
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return false;
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// step 6
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@ -983,7 +1015,7 @@ ScriptedDirectProxyHandler::construct(JSContext* cx, HandleObject proxy, const C
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// step 4-5
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RootedValue trap(cx);
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if (!GetProperty(cx, handler, handler, cx->names().construct, &trap))
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if (!GetProxyTrap(cx, handler, cx->names().construct, &trap))
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return false;
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// step 6
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@ -0,0 +1,103 @@
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/*
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* Any copyright is dedicated to the Public Domain.
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* http://creativecommons.org/licenses/publicdomain/
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*/
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var gTestfile = 'trap-null.js';
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var BUGNUMBER = 1257102;
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var summary = "null as a trap value on a handler should operate on the target";
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print(BUGNUMBER + ": " + summary);
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/**************
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* BEGIN TEST *
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**************/
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// This might seem like overkill, but this proxying trick caught typos of
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// several trap names before this test landed. \o/ /o\
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var allTraps = {
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getPrototypeOf: null,
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setPrototypeOf: null,
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isExtensible: null,
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preventExtensions: null,
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getOwnPropertyDescriptor: null,
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defineProperty: null,
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has: null,
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get: null,
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set: null,
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deleteProperty: null,
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ownKeys: null,
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apply: null,
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construct: null,
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};
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var complainingHandler = new Proxy(allTraps, {
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get(target, p, receiver) {
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var v = Reflect.get(target, p, receiver);
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if (v !== null)
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throw new TypeError("failed to set one of the traps to null? " + p);
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return v;
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}
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});
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var proxyTarget = function(x) {
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"use strict";
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var str = this + x;
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str += new.target ? "constructing" : "calling";
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return new.target ? new String(str) : str;
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};
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proxyTarget.prototype.toString = () => "###";
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proxyTarget.prototype.valueOf = () => "@@@";
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var proxy = new Proxy(proxyTarget, complainingHandler);
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assertEq(Reflect.getPrototypeOf(proxy), Function.prototype);
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assertEq(Object.getPrototypeOf(proxyTarget), Function.prototype);
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assertEq(Reflect.setPrototypeOf(proxy, null), true);
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assertEq(Object.getPrototypeOf(proxyTarget), null);
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assertEq(Reflect.isExtensible(proxy), true);
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assertEq(Reflect.isExtensible(proxyTarget), true);
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assertEq(Reflect.preventExtensions(proxy), true);
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assertEq(Reflect.isExtensible(proxy), false);
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assertEq(Reflect.isExtensible(proxyTarget), false);
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var desc = Reflect.getOwnPropertyDescriptor(proxy, "length");
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assertEq(desc.value, 1);
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assertEq(desc.configurable, true);
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assertEq(Reflect.defineProperty(proxy, "length", { value: 3, configurable: false }), true);
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desc = Reflect.getOwnPropertyDescriptor(proxy, "length");
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assertEq(desc.configurable, false);
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assertEq(Reflect.has(proxy, "length"), true);
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assertEq(Reflect.get(proxy, "length"), 3);
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assertEq(Reflect.set(proxy, "length", 3), false);
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assertEq(Reflect.deleteProperty(proxy, "length"), false);
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var keys = Reflect.ownKeys(proxy);
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assertEq(keys.length, 3);
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keys.sort();
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assertEq(keys[0], "length");
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assertEq(keys[1], "name");
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assertEq(keys[2], "prototype");
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assertEq(Reflect.apply(proxy, "hi!", [" "]), "hi! calling");
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var res = Reflect.construct(proxy, [" - "]);
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assertEq(typeof res, "object");
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assertEq(res instanceof String, true);
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assertEq(res.valueOf(), "@@@ - constructing");
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/******************************************************************************/
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if (typeof reportCompare === "function")
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reportCompare(true, true);
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print("Tests complete");
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