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object.js
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object.js
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/* -*- indent-tabs-mode: nil; js-indent-level: 2; js-indent-level: 2 -*- */
/* vim: set ft=javascript ts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
"use strict";
const { Cu, Ci } = require("chrome");
const { GeneratedLocation } = require("devtools/server/actors/common");
const { DebuggerServer } = require("devtools/server/main")
const DevToolsUtils = require("devtools/toolkit/DevToolsUtils");
const { dbg_assert } = DevToolsUtils;
const PromiseDebugging = require("PromiseDebugging");
const TYPED_ARRAY_CLASSES = ["Uint8Array", "Uint8ClampedArray", "Uint16Array",
"Uint32Array", "Int8Array", "Int16Array", "Int32Array", "Float32Array",
"Float64Array"];
// Number of items to preview in objects, arrays, maps, sets, lists,
// collections, etc.
const OBJECT_PREVIEW_MAX_ITEMS = 10;
/**
* Creates an actor for the specified object.
*
* @param obj Debugger.Object
* The debuggee object.
* @param hooks Object
* A collection of abstract methods that are implemented by the caller.
* ObjectActor requires the following functions to be implemented by
* the caller:
* - createValueGrip
* Creates a value grip for the given object
* - sources
* TabSources getter that manages the sources of a thread
* - createEnvironmentActor
* Creates and return an environment actor
* - getGripDepth
* An actor's grip depth getter
* - incrementGripDepth
* Increment the actor's grip depth
* - decrementGripDepth
* Decrement the actor's grip depth
*/
function ObjectActor(obj, {
createValueGrip,
sources,
createEnvironmentActor,
getGripDepth,
incrementGripDepth,
decrementGripDepth
}) {
dbg_assert(!obj.optimizedOut,
"Should not create object actors for optimized out values!");
this.obj = obj;
this.hooks = {
createValueGrip,
sources,
createEnvironmentActor,
getGripDepth,
incrementGripDepth,
decrementGripDepth
};
this.iterators = new Set();
}
ObjectActor.prototype = {
actorPrefix: "obj",
/**
* Returns a grip for this actor for returning in a protocol message.
*/
grip: function() {
this.hooks.incrementGripDepth();
let g = {
"type": "object",
"class": this.obj.class,
"actor": this.actorID,
"extensible": this.obj.isExtensible(),
"frozen": this.obj.isFrozen(),
"sealed": this.obj.isSealed()
};
if (this.obj.class != "DeadObject") {
// Expose internal Promise state.
if (this.obj.class == "Promise") {
const { state, value, reason } = getPromiseState(this.obj);
g.promiseState = { state };
if (state == "fulfilled") {
g.promiseState.value = this.hooks.createValueGrip(value);
} else if (state == "rejected") {
g.promiseState.reason = this.hooks.createValueGrip(reason);
}
}
// FF40+: Allow to know how many properties an object has
// to lazily display them when there is a bunch.
// Throws on some MouseEvent object in tests.
try {
// Bug 1163520: Assert on internal functions
if (this.obj.class != "Function") {
g.ownPropertyLength = this.obj.getOwnPropertyNames().length;
}
} catch(e) {}
let raw = this.obj.unsafeDereference();
// If Cu is not defined, we are running on a worker thread, where xrays
// don't exist.
if (Cu) {
raw = Cu.unwaiveXrays(raw);
}
if (!DevToolsUtils.isSafeJSObject(raw)) {
raw = null;
}
let previewers = DebuggerServer.ObjectActorPreviewers[this.obj.class] ||
DebuggerServer.ObjectActorPreviewers.Object;
for (let fn of previewers) {
try {
if (fn(this, g, raw)) {
break;
}
} catch (e) {
let msg = "ObjectActor.prototype.grip previewer function";
DevToolsUtils.reportException(msg, e);
}
}
}
this.hooks.decrementGripDepth();
return g;
},
/**
* Releases this actor from the pool.
*/
release: function() {
if (this.registeredPool.objectActors) {
this.registeredPool.objectActors.delete(this.obj);
}
this.iterators.forEach(actor => this.registeredPool.removeActor(actor));
this.iterators.clear();
this.registeredPool.removeActor(this);
},
/**
* Handle a protocol request to provide the definition site of this function
* object.
*/
onDefinitionSite: function() {
if (this.obj.class != "Function") {
return {
from: this.actorID,
error: "objectNotFunction",
message: this.actorID + " is not a function."
};
}
if (!this.obj.script) {
return {
from: this.actorID,
error: "noScript",
message: this.actorID + " has no Debugger.Script"
};
}
return this.hooks.sources().getOriginalLocation(new GeneratedLocation(
this.hooks.sources().createNonSourceMappedActor(this.obj.script.source),
this.obj.script.startLine,
0 // TODO bug 901138: use Debugger.Script.prototype.startColumn
)).then((originalLocation) => {
return {
source: originalLocation.originalSourceActor.form(),
line: originalLocation.originalLine,
column: originalLocation.originalColumn
};
});
},
/**
* Handle a protocol request to provide the names of the properties defined on
* the object and not its prototype.
*/
onOwnPropertyNames: function() {
return { from: this.actorID,
ownPropertyNames: this.obj.getOwnPropertyNames() };
},
/**
* Creates an actor to iterate over an object property names and values.
* See PropertyIteratorActor constructor for more info about options param.
*
* @param request object
* The protocol request object.
*/
onEnumProperties: function(request) {
let actor = new PropertyIteratorActor(this, request.options);
this.registeredPool.addActor(actor);
this.iterators.add(actor);
return { iterator: actor.grip() };
},
/**
* Handle a protocol request to provide the prototype and own properties of
* the object.
*/
onPrototypeAndProperties: function() {
let ownProperties = Object.create(null);
let names;
try {
names = this.obj.getOwnPropertyNames();
} catch (ex) {
// The above can throw if this.obj points to a dead object.
// TODO: we should use Cu.isDeadWrapper() - see bug 885800.
return { from: this.actorID,
prototype: this.hooks.createValueGrip(null),
ownProperties: ownProperties,
safeGetterValues: Object.create(null) };
}
for (let name of names) {
ownProperties[name] = this._propertyDescriptor(name);
}
return { from: this.actorID,
prototype: this.hooks.createValueGrip(this.obj.proto),
ownProperties: ownProperties,
safeGetterValues: this._findSafeGetterValues(names) };
},
/**
* Find the safe getter values for the current Debugger.Object, |this.obj|.
*
* @private
* @param array ownProperties
* The array that holds the list of known ownProperties names for
* |this.obj|.
* @param number [limit=0]
* Optional limit of getter values to find.
* @return object
* An object that maps property names to safe getter descriptors as
* defined by the remote debugging protocol.
*/
_findSafeGetterValues: function(ownProperties, limit = 0) {
let safeGetterValues = Object.create(null);
let obj = this.obj;
let level = 0, i = 0;
while (obj) {
let getters = this._findSafeGetters(obj);
for (let name of getters) {
// Avoid overwriting properties from prototypes closer to this.obj. Also
// avoid providing safeGetterValues from prototypes if property |name|
// is already defined as an own property.
if (name in safeGetterValues ||
(obj != this.obj && ownProperties.indexOf(name) !== -1)) {
continue;
}
// Ignore __proto__ on Object.prototye.
if (!obj.proto && name == "__proto__") {
continue;
}
let desc = null, getter = null;
try {
desc = obj.getOwnPropertyDescriptor(name);
getter = desc.get;
} catch (ex) {
// The above can throw if the cache becomes stale.
}
if (!getter) {
obj._safeGetters = null;
continue;
}
let result = getter.call(this.obj);
if (result && !("throw" in result)) {
let getterValue = undefined;
if ("return" in result) {
getterValue = result.return;
} else if ("yield" in result) {
getterValue = result.yield;
}
// WebIDL attributes specified with the LenientThis extended attribute
// return undefined and should be ignored.
if (getterValue !== undefined) {
safeGetterValues[name] = {
getterValue: this.hooks.createValueGrip(getterValue),
getterPrototypeLevel: level,
enumerable: desc.enumerable,
writable: level == 0 ? desc.writable : true,
};
if (limit && ++i == limit) {
break;
}
}
}
}
if (limit && i == limit) {
break;
}
obj = obj.proto;
level++;
}
return safeGetterValues;
},
/**
* Find the safe getters for a given Debugger.Object. Safe getters are native
* getters which are safe to execute.
*
* @private
* @param Debugger.Object object
* The Debugger.Object where you want to find safe getters.
* @return Set
* A Set of names of safe getters. This result is cached for each
* Debugger.Object.
*/
_findSafeGetters: function(object) {
if (object._safeGetters) {
return object._safeGetters;
}
let getters = new Set();
let names = [];
try {
names = object.getOwnPropertyNames()
} catch (ex) {
// Calling getOwnPropertyNames() on some wrapped native prototypes is not
// allowed: "cannot modify properties of a WrappedNative". See bug 952093.
}
for (let name of names) {
let desc = null;
try {
desc = object.getOwnPropertyDescriptor(name);
} catch (e) {
// Calling getOwnPropertyDescriptor on wrapped native prototypes is not
// allowed (bug 560072).
}
if (!desc || desc.value !== undefined || !("get" in desc)) {
continue;
}
if (DevToolsUtils.hasSafeGetter(desc)) {
getters.add(name);
}
}
object._safeGetters = getters;
return getters;
},
/**
* Handle a protocol request to provide the prototype of the object.
*/
onPrototype: function() {
return { from: this.actorID,
prototype: this.hooks.createValueGrip(this.obj.proto) };
},
/**
* Handle a protocol request to provide the property descriptor of the
* object's specified property.
*
* @param request object
* The protocol request object.
*/
onProperty: function(request) {
if (!request.name) {
return { error: "missingParameter",
message: "no property name was specified" };
}
return { from: this.actorID,
descriptor: this._propertyDescriptor(request.name) };
},
/**
* Handle a protocol request to provide the display string for the object.
*/
onDisplayString: function() {
const string = stringify(this.obj);
return { from: this.actorID,
displayString: this.hooks.createValueGrip(string) };
},
/**
* A helper method that creates a property descriptor for the provided object,
* properly formatted for sending in a protocol response.
*
* @private
* @param string name
* The property that the descriptor is generated for.
* @param boolean [onlyEnumerable]
* Optional: true if you want a descriptor only for an enumerable
* property, false otherwise.
* @return object|undefined
* The property descriptor, or undefined if this is not an enumerable
* property and onlyEnumerable=true.
*/
_propertyDescriptor: function(name, onlyEnumerable) {
let desc;
try {
desc = this.obj.getOwnPropertyDescriptor(name);
} catch (e) {
// Calling getOwnPropertyDescriptor on wrapped native prototypes is not
// allowed (bug 560072). Inform the user with a bogus, but hopefully
// explanatory, descriptor.
return {
configurable: false,
writable: false,
enumerable: false,
value: e.name
};
}
if (!desc || onlyEnumerable && !desc.enumerable) {
return undefined;
}
let retval = {
configurable: desc.configurable,
enumerable: desc.enumerable
};
if ("value" in desc) {
retval.writable = desc.writable;
retval.value = this.hooks.createValueGrip(desc.value);
} else {
if ("get" in desc) {
retval.get = this.hooks.createValueGrip(desc.get);
}
if ("set" in desc) {
retval.set = this.hooks.createValueGrip(desc.set);
}
}
return retval;
},
/**
* Handle a protocol request to provide the source code of a function.
*
* @param request object
* The protocol request object.
*/
onDecompile: function(request) {
if (this.obj.class !== "Function") {
return { error: "objectNotFunction",
message: "decompile request is only valid for object grips " +
"with a 'Function' class." };
}
return { from: this.actorID,
decompiledCode: this.obj.decompile(!!request.pretty) };
},
/**
* Handle a protocol request to provide the parameters of a function.
*/
onParameterNames: function() {
if (this.obj.class !== "Function") {
return { error: "objectNotFunction",
message: "'parameterNames' request is only valid for object " +
"grips with a 'Function' class." };
}
return { parameterNames: this.obj.parameterNames };
},
/**
* Handle a protocol request to release a thread-lifetime grip.
*/
onRelease: function() {
this.release();
return {};
},
/**
* Handle a protocol request to provide the lexical scope of a function.
*/
onScope: function() {
if (this.obj.class !== "Function") {
return { error: "objectNotFunction",
message: "scope request is only valid for object grips with a" +
" 'Function' class." };
}
let envActor = this.hooks.createEnvironmentActor(this.obj.environment,
this.registeredPool);
if (!envActor) {
return { error: "notDebuggee",
message: "cannot access the environment of this function." };
}
return { from: this.actorID, scope: envActor.form() };
}
};
ObjectActor.prototype.requestTypes = {
"definitionSite": ObjectActor.prototype.onDefinitionSite,
"parameterNames": ObjectActor.prototype.onParameterNames,
"prototypeAndProperties": ObjectActor.prototype.onPrototypeAndProperties,
"enumProperties": ObjectActor.prototype.onEnumProperties,
"prototype": ObjectActor.prototype.onPrototype,
"property": ObjectActor.prototype.onProperty,
"displayString": ObjectActor.prototype.onDisplayString,
"ownPropertyNames": ObjectActor.prototype.onOwnPropertyNames,
"decompile": ObjectActor.prototype.onDecompile,
"release": ObjectActor.prototype.onRelease,
"scope": ObjectActor.prototype.onScope,
};
/**
* Creates an actor to iterate over an object's property names and values.
*
* @param objectActor ObjectActor
* The object actor.
* @param options Object
* A dictionary object with various boolean attributes:
* - ignoreSafeGetters Boolean
* If true, do not iterate over safe getters.
* - ignoreIndexedProperties Boolean
* If true, filters out Array items.
* e.g. properties names between `0` and `object.length`.
* - ignoreNonIndexedProperties Boolean
* If true, filters out items that aren't array items
* e.g. properties names that are not a number between `0`
* and `object.length`.
* - sort Boolean
* If true, the iterator will sort the properties by name
* before dispatching them.
* - query String
* If non-empty, will filter the properties by names containing
* this query string. The match is not case-sensitive.
*/
function PropertyIteratorActor(objectActor, options){
this.objectActor = objectActor;
let ownProperties = Object.create(null);
let names = [];
try {
names = this.objectActor.obj.getOwnPropertyNames();
} catch (ex) {}
let safeGetterValues = {};
let safeGetterNames = [];
if (!options.ignoreSafeGetters) {
// Merge the safe getter values into the existing properties list.
safeGetterValues = this.objectActor._findSafeGetterValues(names);
safeGetterNames = Object.keys(safeGetterValues);
for (let name of safeGetterNames) {
if (names.indexOf(name) === -1) {
names.push(name);
}
}
}
if (options.ignoreIndexedProperties || options.ignoreNonIndexedProperties) {
let length = DevToolsUtils.getProperty(this.objectActor.obj, "length");
if (typeof(length) !== "number") {
// Pseudo arrays are flagged as ArrayLike if they have
// subsequent indexed properties without having any length attribute.
length = 0;
for (let key of names) {
if (isNaN(key) || key != length++) {
break;
}
}
}
if (options.ignoreIndexedProperties) {
names = names.filter(i => {
// Use parseFloat in order to reject floats...
// (parseInt converts floats to integer)
// (Number(str) converts spaces to 0)
i = parseFloat(i);
return !Number.isInteger(i) || i < 0 || i >= length;
});
}
if (options.ignoreNonIndexedProperties) {
names = names.filter(i => {
i = parseFloat(i);
return Number.isInteger(i) && i >= 0 && i < length;
});
}
}
if (options.query) {
let { query } = options;
query = query.toLowerCase();
names = names.filter(name => {
return name.toLowerCase().includes(query);
});
}
if (options.sort) {
names.sort();
}
// Now build the descriptor list
for (let name of names) {
let desc = this.objectActor._propertyDescriptor(name);
if (!desc) {
desc = safeGetterValues[name];
}
else if (name in safeGetterValues) {
// Merge the safe getter values into the existing properties list.
let { getterValue, getterPrototypeLevel } = safeGetterValues[name];
desc.getterValue = getterValue;
desc.getterPrototypeLevel = getterPrototypeLevel;
}
ownProperties[name] = desc;
}
this.names = names;
this.ownProperties = ownProperties;
}
PropertyIteratorActor.prototype = {
actorPrefix: "propertyIterator",
grip: function() {
return {
type: "propertyIterator",
actor: this.actorID,
count: this.names.length
};
},
names: function({ indexes }) {
let list = [];
for (let idx of indexes) {
list.push(this.names[idx]);
}
return {
names: list
};
},
slice: function({ start, count }) {
let names = this.names.slice(start, start + count);
let props = Object.create(null);
for (let name of names) {
props[name] = this.ownProperties[name];
}
return {
ownProperties: props
};
},
all: function() {
return {
ownProperties: this.ownProperties
};
}
};
PropertyIteratorActor.prototype.requestTypes = {
"names": PropertyIteratorActor.prototype.names,
"slice": PropertyIteratorActor.prototype.slice,
"all": PropertyIteratorActor.prototype.all,
};
/**
* Functions for adding information to ObjectActor grips for the purpose of
* having customized output. This object holds arrays mapped by
* Debugger.Object.prototype.class.
*
* In each array you can add functions that take two
* arguments:
* - the ObjectActor instance and its hooks to make a preview for,
* - the grip object being prepared for the client,
* - the raw JS object after calling Debugger.Object.unsafeDereference(). This
* argument is only provided if the object is safe for reading properties and
* executing methods. See DevToolsUtils.isSafeJSObject().
*
* Functions must return false if they cannot provide preview
* information for the debugger object, or true otherwise.
*/
DebuggerServer.ObjectActorPreviewers = {
String: [function({obj, hooks}, grip) {
let result = genericObjectPreviewer("String", String, obj, hooks);
let length = DevToolsUtils.getProperty(obj, "length");
if (!result || typeof length != "number") {
return false;
}
grip.preview = {
kind: "ArrayLike",
length: length
};
if (hooks.getGripDepth() > 1) {
return true;
}
let items = grip.preview.items = [];
const max = Math.min(result.value.length, OBJECT_PREVIEW_MAX_ITEMS);
for (let i = 0; i < max; i++) {
let value = hooks.createValueGrip(result.value[i]);
items.push(value);
}
return true;
}],
Boolean: [function({obj, hooks}, grip) {
let result = genericObjectPreviewer("Boolean", Boolean, obj, hooks);
if (result) {
grip.preview = result;
return true;
}
return false;
}],
Number: [function({obj, hooks}, grip) {
let result = genericObjectPreviewer("Number", Number, obj, hooks);
if (result) {
grip.preview = result;
return true;
}
return false;
}],
Function: [function({obj, hooks}, grip) {
if (obj.name) {
grip.name = obj.name;
}
if (obj.displayName) {
grip.displayName = obj.displayName.substr(0, 500);
}
if (obj.parameterNames) {
grip.parameterNames = obj.parameterNames;
}
// Check if the developer has added a de-facto standard displayName
// property for us to use.
let userDisplayName;
try {
userDisplayName = obj.getOwnPropertyDescriptor("displayName");
} catch (e) {
// Calling getOwnPropertyDescriptor with displayName might throw
// with "permission denied" errors for some functions.
dumpn(e);
}
if (userDisplayName && typeof userDisplayName.value == "string" &&
userDisplayName.value) {
grip.userDisplayName = hooks.createValueGrip(userDisplayName.value);
}
return true;
}],
RegExp: [function({obj, hooks}, grip) {
// Avoid having any special preview for the RegExp.prototype itself.
if (!obj.proto || obj.proto.class != "RegExp") {
return false;
}
let str = RegExp.prototype.toString.call(obj.unsafeDereference());
grip.displayString = hooks.createValueGrip(str);
return true;
}],
Date: [function({obj, hooks}, grip) {
let time = Date.prototype.getTime.call(obj.unsafeDereference());
grip.preview = {
timestamp: hooks.createValueGrip(time),
};
return true;
}],
Array: [function({obj, hooks}, grip) {
let length = DevToolsUtils.getProperty(obj, "length");
if (typeof length != "number") {
return false;
}
grip.preview = {
kind: "ArrayLike",
length: length,
};
if (hooks.getGripDepth() > 1) {
return true;
}
let raw = obj.unsafeDereference();
let items = grip.preview.items = [];
for (let i = 0; i < length; ++i) {
// Array Xrays filter out various possibly-unsafe properties (like
// functions, and claim that the value is undefined instead. This
// is generally the right thing for privileged code accessing untrusted
// objects, but quite confusing for Object previews. So we manually
// override this protection by waiving Xrays on the array, and re-applying
// Xrays on any indexed value props that we pull off of it.
let desc = Object.getOwnPropertyDescriptor(Cu.waiveXrays(raw), i);
if (desc && !desc.get && !desc.set) {
let value = Cu.unwaiveXrays(desc.value);
value = makeDebuggeeValueIfNeeded(obj, value);
items.push(hooks.createValueGrip(value));
} else {
items.push(null);
}
if (items.length == OBJECT_PREVIEW_MAX_ITEMS) {
break;
}
}
return true;
}],
Set: [function({obj, hooks}, grip) {
let size = DevToolsUtils.getProperty(obj, "size");
if (typeof size != "number") {
return false;
}
grip.preview = {
kind: "ArrayLike",
length: size,
};
// Avoid recursive object grips.
if (hooks.getGripDepth() > 1) {
return true;
}
let raw = obj.unsafeDereference();
let items = grip.preview.items = [];
// We currently lack XrayWrappers for Set, so when we iterate over
// the values, the temporary iterator objects get created in the target
// compartment. However, we _do_ have Xrays to Object now, so we end up
// Xraying those temporary objects, and filtering access to |it.value|
// based on whether or not it's Xrayable and/or callable, which breaks
// the for/of iteration.
//
// This code is designed to handle untrusted objects, so we can safely
// waive Xrays on the iterable, and relying on the Debugger machinery to
// make sure we handle the resulting objects carefully.
for (let item of Cu.waiveXrays(Set.prototype.values.call(raw))) {
item = Cu.unwaiveXrays(item);
item = makeDebuggeeValueIfNeeded(obj, item);
items.push(hooks.createValueGrip(item));
if (items.length == OBJECT_PREVIEW_MAX_ITEMS) {
break;
}
}
return true;
}],
Map: [function({obj, hooks}, grip) {
let size = DevToolsUtils.getProperty(obj, "size");
if (typeof size != "number") {
return false;
}
grip.preview = {
kind: "MapLike",
size: size,
};
if (hooks.getGripDepth() > 1) {
return true;
}
let raw = obj.unsafeDereference();
let entries = grip.preview.entries = [];
// Iterating over a Map via .entries goes through various intermediate
// objects - an Iterator object, then a 2-element Array object, then the
// actual values we care about. We don't have Xrays to Iterator objects,
// so we get Opaque wrappers for them. And even though we have Xrays to
// Arrays, the semantics often deny access to the entires based on the
// nature of the values. So we need waive Xrays for the iterator object
// and the tupes, and then re-apply them on the underlying values until
// we fix bug 1023984.
//
// Even then though, we might want to continue waiving Xrays here for the
// same reason we do so for Arrays above - this filtering behavior is likely
// to be more confusing than beneficial in the case of Object previews.
for (let keyValuePair of Cu.waiveXrays(Map.prototype.entries.call(raw))) {
let key = Cu.unwaiveXrays(keyValuePair[0]);
let value = Cu.unwaiveXrays(keyValuePair[1]);
key = makeDebuggeeValueIfNeeded(obj, key);
value = makeDebuggeeValueIfNeeded(obj, value);
entries.push([hooks.createValueGrip(key),
hooks.createValueGrip(value)]);
if (entries.length == OBJECT_PREVIEW_MAX_ITEMS) {
break;
}
}
return true;
}],
DOMStringMap: [function({obj, hooks}, grip, rawObj) {
if (!rawObj) {
return false;
}
let keys = obj.getOwnPropertyNames();
grip.preview = {
kind: "MapLike",
size: keys.length,
};
if (hooks.getGripDepth() > 1) {
return true;
}
let entries = grip.preview.entries = [];
for (let key of keys) {
let value = makeDebuggeeValueIfNeeded(obj, rawObj[key]);
entries.push([key, hooks.createValueGrip(value)]);
if (entries.length == OBJECT_PREVIEW_MAX_ITEMS) {
break;
}
}
return true;
}],
};
/**
* Generic previewer for "simple" classes like String, Number and Boolean.
*
* @param string className
* Class name to expect.
* @param object classObj
* The class to expect, eg. String. The valueOf() method of the class is
* invoked on the given object.
* @param Debugger.Object obj
* The debugger object we need to preview.
* @param object hooks
* The thread actor to use to create a value grip.
* @return object|null
* An object with one property, "value", which holds the value grip that
* represents the given object. Null is returned if we cant preview the
* object.
*/
function genericObjectPreviewer(className, classObj, obj, hooks) {
if (!obj.proto || obj.proto.class != className) {
return null;
}
let raw = obj.unsafeDereference();
let v = null;
try {
v = classObj.prototype.valueOf.call(raw);
} catch (ex) {
// valueOf() can throw if the raw JS object is "misbehaved".
return null;
}
if (v !== null) {
v = hooks.createValueGrip(makeDebuggeeValueIfNeeded(obj, v));
return { value: v };
}
return null;
}
// Preview functions that do not rely on the object class.
DebuggerServer.ObjectActorPreviewers.Object = [
function TypedArray({obj, hooks}, grip) {
if (TYPED_ARRAY_CLASSES.indexOf(obj.class) == -1) {
return false;
}
let length = DevToolsUtils.getProperty(obj, "length");
if (typeof length != "number") {
return false;
}
grip.preview = {
kind: "ArrayLike",
length: length,
};
if (hooks.getGripDepth() > 1) {
return true;
}