b7ff2bd5cd
Function proxies would not be printed so far since they ended up in Function.prototype.toString which only works with Function as a receiver but no Proxy. Additionally added support for more gracefully dealing with recursive __proto__ structures introduced by proxies. drive-by-fix: use IS_PROXY if possible in .js files. BUG=v8:1543 LOG=n Committed: https://crrev.com/8bfb7189a3472bc9d0820a1bd4534eaaf78ff847 Cr-Commit-Position: refs/heads/master@{#32985} Review URL: https://codereview.chromium.org/1530293004 Cr-Commit-Position: refs/heads/master@{#33010}
92 lines
2.8 KiB
JavaScript
92 lines
2.8 KiB
JavaScript
// Copyright 2008 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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"use strict";
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// A more universal stringify that supports more types than JSON.
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// Used by the d8 shell to output results.
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var stringifyDepthLimit = 4; // To avoid crashing on cyclic objects
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// Hacky solution to circumvent forcing --allow-natives-syntax for d8
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function isProxy(o) { return false };
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function JSProxyGetTarget(proxy) { };
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function JSProxyGetHandler(proxy) { };
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try {
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isProxy = Function(['object'], 'return %_IsJSProxy(object)');
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JSProxyGetTarget = Function(['proxy'],
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'return %JSProxyGetTarget(proxy)');
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JSProxyGetHandler = Function(['proxy'],
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'return %JSProxyGetHandler(proxy)');
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} catch(e) {};
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function Stringify(x, depth) {
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if (depth === undefined)
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depth = stringifyDepthLimit;
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else if (depth === 0)
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return "...";
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if (isProxy(x)) {
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return StringifyProxy(x, depth);
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}
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switch (typeof x) {
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case "undefined":
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return "undefined";
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case "boolean":
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case "number":
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case "function":
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return x.toString();
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case "string":
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return "\"" + x.toString() + "\"";
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case "symbol":
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return x.toString();
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case "object":
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if (IS_NULL(x)) return "null";
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if (x.constructor && x.constructor.name === "Array") {
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var elems = [];
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for (var i = 0; i < x.length; ++i) {
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elems.push(
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{}.hasOwnProperty.call(x, i) ? Stringify(x[i], depth - 1) : "");
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}
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return "[" + elems.join(", ") + "]";
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}
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try {
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var string = String(x);
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if (string && string !== "[object Object]") return string;
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} catch(e) {}
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var props = [];
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var names = Object.getOwnPropertyNames(x);
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names = names.concat(Object.getOwnPropertySymbols(x));
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for (var i in names) {
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var name = names[i];
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var desc = Object.getOwnPropertyDescriptor(x, name);
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if (IS_UNDEFINED(desc)) continue;
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if (IS_SYMBOL(name)) name = "[" + Stringify(name) + "]";
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if ("value" in desc) {
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props.push(name + ": " + Stringify(desc.value, depth - 1));
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}
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if (desc.get) {
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var getter = Stringify(desc.get);
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props.push("get " + name + getter.slice(getter.indexOf('(')));
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}
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if (desc.set) {
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var setter = Stringify(desc.set);
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props.push("set " + name + setter.slice(setter.indexOf('(')));
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}
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}
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return "{" + props.join(", ") + "}";
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default:
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return "[crazy non-standard value]";
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}
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}
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function StringifyProxy(proxy, depth) {
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var proxy_type = typeof proxy;
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var info_object = {
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target: JSProxyGetTarget(proxy),
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handler: JSProxyGetHandler(proxy)
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}
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return '[' + proxy_type + ' Proxy ' + Stringify(info_object, depth-1) + ']';
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}
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