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computer.js
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/**
* @fileoverview Implements the PCx86 Computer component
* @author <a href="mailto:[email protected]">Jeff Parsons</a>
* @copyright © 2012-2020 Jeff Parsons
*
* This file is part of PCjs, a computer emulation software project at <https://www.pcjs.org>.
*
* PCjs is free software: you can redistribute it and/or modify it under the terms of the
* GNU General Public License as published by the Free Software Foundation, either version 3
* of the License, or (at your option) any later version.
*
* PCjs is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without
* even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along with PCjs. If not,
* see <http://www.gnu.org/licenses/gpl.html>.
*
* You are required to include the above copyright notice in every modified copy of this work
* and to display that copyright notice when the software starts running; see COPYRIGHT in
* <https://www.pcjs.org/modules/shared/lib/defines.js>.
*
* Some PCjs files also attempt to load external resource files, such as character-image files,
* ROM files, and disk image files. Those external resource files are not considered part of PCjs
* for purposes of the GNU General Public License, and the author does not claim any copyright
* as to their contents.
*/
/*
* BUILD INSTRUCTIONS
*
* To build PCx86 (pcx86.js), run Google's Closure Compiler, replacing "*.js" with the input file sequence defined
* by the "PCx86Files" property in package.json:
*
* java -jar compiler.jar
* --compilation_level ADVANCED_OPTIMIZATIONS
* --define='DEBUG=false'
* --warning_level=VERBOSE
* --js *.js
* --js_output_file pc.js
*
* Google's Closure Compiler (compiler.jar) is documented at https://developers.google.com/closure/compiler/
* and is available for download here:
*
* http://closure-compiler.googlecode.com/files/compiler-latest.zip
*
* The PCx86 JavaScript files do have some initialization-order dependencies. If you load the files individually,
* it's recommended that you load them in the same order that they're compiled.
*
* Generally speaking, component.js should be first, computer.js should be last (of the files based on component.js),
* and panel.js should be listed early so that the Control Panel is ready as soon as possible.
*
* Another recent ordering requirement is that rom.js must be loaded before ram.js; this was true before, but now
* it's required, because I'm starting to add ROM BIOS Data Area definitions to rom.js, and since the data area
* is in RAM, ram.js may want access to some of those definitions.
*/
"use strict";
if (typeof module !== "undefined") {
var Str = require("../../shared/lib/strlib");
var Usr = require("../../shared/lib/usrlib");
var Web = require("../../shared/lib/weblib");
var UserAPI = require("../../shared/lib/userapi");
// var ReportAPI = require("../../shared/lib/reportapi");
var Component = require("../../shared/lib/component");
var State = require("../../shared/lib/state");
var PCx86 = require("./defines");
var Messages = require("./messages");
var BusX86 = require("./bus").BusX86;
var FPUx86 = require("./fpux86");
}
/**
* class Computer
* @unrestricted (allows the class to define properties, both dot and named, outside of the constructor)
*/
class Computer extends Component {
/**
* Computer(parmsComputer, parmsMachine, fSuspended)
*
* The Computer component has no required (parmsComputer) properties, but it does
* support the following:
*
* autoPower: true to automatically power the computer (default), false to wait;
* false is honored only if a "power" button binding exists.
*
* busWidth: number of memory address lines (address bits) on the computer's "bus";
* 20 is the minimum (and the default), which implies 8086/8088 real-mode addressing,
* while 24 is required for 80286 protected-mode addressing. This value is passed
* directly through to the Bus component; see that component for more details.
*
* resume: one of the Computer.RESUME constants, which are as follows:
* '0' if resume disabled (default)
* '1' if enabled without prompting
* '2' if enabled with prompting
* '3' if enabled with prompting and auto-delete
* or a string containing the path of a predefined JSON-encoded state
*
* state: the path to JSON-encoded state file (see details regarding 'state' below)
*
* The parmsMachine object, if provided, may contain any of:
*
* autoMount: if set, this should override any 'autoMount' property in the FDC's
* parmsFDC object.
*
* autoPower: if set, this should override any 'autoPower' property in the Computer's
* parmsComputer object.
*
* messages: if set, this should override any 'messages' property in the Debugger's
* parmsDbg object.
*
* state: if set, this should override any 'state' property in the Computer's
* parmsComputer object.
*
* url: the location of the machine XML file
*
* diagnostics: 0 for none, 1 for normal diagnostics, and 2 for diagnostics with prompting
*
* If a predefined state is supplied AND it's successfully loaded, then resume behavior
* defaults to '1' (ie, resume enabled without prompting).
*
* This component insures that all components are ready before "powering" them.
*
* Different components become ready at different times, and initialization order (ie,
* the order the scripts are combined on the page) only partially determines readiness.
* This is because components like ROM and Video must finish loading their resource files
* before they are ready. Other components become ready after we call their initBus()
* function, because they have a Bus or CPU dependency, such as access to memory management
* functions. And other components, like CPU and Panel, are ready as soon as their
* constructor finishes.
*
* Once a component has indicated it's ready, we call its powerUp() notification
* function (if it has one--it's optional). We call the CPU's powerUp() function last,
* so that the CPU is assured that all other components are ready and "powered".
*
* @this {Computer}
* @param {Object} parmsComputer
* @param {Object} [parmsMachine]
* @param {boolean} [fSuspended]
*/
constructor(parmsComputer, parmsMachine, fSuspended)
{
super("Computer", parmsComputer, Messages.COMPUTER);
let cmp = this;
this.setMachineParms(parmsMachine);
this.fAutoPower = this.getMachineParm('autoPower', parmsComputer);
this.nDiagnostics = +this.getMachineParm('diagnostics', parmsComputer);
if (!(this.nDiagnostics >= 0 && this.nDiagnostics <= 2)) this.nDiagnostics = 1;
/*
* nPowerChange is 0 while the power state is stable, 1 while power is transitioning
* to "on", and -1 while power is transitioning to "off".
*/
this.nPowerChange = 0;
/*
* TODO: Deprecate 'buswidth' (it should have always used camelCase)
*/
this.nBusWidth = parmsComputer['busWidth'] || parmsComputer['buswidth'];
this.resume = Computer.RESUME_NONE;
this.sStateData = null;
this.fStateData = false; // remembers if sStateData was loaded
this.fServerState = false;
this.url = this.getMachineParm('url') || "";
/*
* Generate a random number x (where 0 <= x < 1), add 0.1 so that it's guaranteed to be
* non-zero, convert to base 36, and chop off the leading digit and "decimal" point.
*/
this.sMachineID = (Math.random() + 0.1).toString(36).substr(2,12);
this.sUserID = this.queryUserID();
/*
* Find the appropriate CPU (and Debugger and Control Panel, if any)
*
* CLOSURE COMPILER TIP: To override the type of a right-hand expression (as we need to do here,
* where we know getComponentByType() will only return an CPUx86 object or null), wrap the expression
* in parentheses. I never knew this until I stumbled across it in "Closure: The Definitive Guide".
*/
this.cpu = /** @type {CPUx86} */ (Component.getComponentByType("CPU", this.id));
if (!this.cpu) {
Component.error("Unable to find CPU component");
return;
}
/*
* We now record whether or not the machine was originally configured with an FPU (this.fpu),
* but even when not, we still initialize an FPU, so that the machine can be dynamically reconfigured.
*/
this.fpu = /** @type {FPUx86} */ (Component.getComponentByType("FPU", this.id));
if (!this.fpu) new FPUx86({'id': this.idMachine + ".fpu"});
this.dbg = /** @type {DebuggerX86} */ (Component.getComponentByType("Debugger", this.id));
/*
* Enumerate all the Video components for diagnostic displays, focus changes, and updateStatus() calls.
*/
this.aVideo = [];
for (let video = null; (video = this.getMachineComponent("Video", video));) {
this.aVideo.push(video);
}
/*
* Initialize the Bus component
*/
this.bus = new BusX86({'id': this.idMachine + '.bus', 'busWidth': this.nBusWidth}, this.cpu, this.dbg);
/*
* Iterate through all the components and override their notice() and println() methods
* so that their output can be rerouted to a Diagnostic Display or Control Panel, if any.
*/
let iComponent, component;
let aComponents = Component.getComponents(this.id);
this.panel = /** @type {Panel} */ (Component.getComponentByType("Panel", this.id));
this.controlPanel = this.panel && this.panel.bindings['print'];
this.noticeComputer = this.notice;
this.printComputer = this.print;
this.printlnComputer = this.println;
if (this.controlPanel) {
this.noticeComputer = this.panel.notice;
this.printComputer = this.panel.print;
this.printlnComputer = this.panel.println;
}
for (iComponent = 0; iComponent < aComponents.length; iComponent++) {
component = aComponents[iComponent];
component.notice = function noticeComputer(s, fPrintOnly, id) {
cmp.outputDiagnostics(s);
return cmp.noticeComputer.call(this, s, fPrintOnly, id);
}.bind(component);
component.print = function printComputer(s) {
return cmp.printComputer.call(this, s);
}.bind(component);
component.println = function printlnComputer(s, type, id) {
cmp.outputDiagnostics(s, type);
return cmp.printlnComputer.call(this, s, type, id);
}.bind(component);
}
this.cDiagnosticScreens = 0;
if (!this.controlPanel && this.nDiagnostics) {
this.enableDiagnostics();
}
this.println(PCx86.APPNAME + " v" + (XMLVERSION || PCx86.APPVERSION) + "\n" + COPYRIGHT + "\n" + LICENSE);
if (DEBUG) this.printf("PREFETCH: %b, TYPEDARRAYS: %b\n", PREFETCH, TYPEDARRAYS);
/*
* Iterate through all the components again and call their initBus() handler, if any
*/
for (iComponent = 0; iComponent < aComponents.length; iComponent++) {
component = aComponents[iComponent];
if (component.initBus) component.initBus(this, this.bus, this.cpu, this.dbg);
}
/*
* This timer replaces the CPU's old dedicated STATUS_UPDATES_PER_SECOND logic; periodic updateStatus()
* calls are now our own responsibility.
*/
this.cpu.addTimer(this.id, function updateStatusTimer() {
cmp.updateStatus();
}, 1000 / Computer.UPDATES_PER_SECOND);
let sStatePath = null;
let sResume = this.getMachineParm('resume');
if (sResume !== undefined) {
/*
* Decide whether the 'resume' property is a number or the path of a state file to resume.
*/
if (sResume.length > 1) {
sStatePath = this.sResumePath = sResume;
} else {
this.resume = parseInt(sResume, 10);
}
}
/*
* The Computer 'state' property allows a state file to be specified independent of the 'resume' feature;
* previously, you could only use 'resume' to load a state file -- which we still support, but loading a state
* file that way prevents the machine's state from being saved, since we always resume from the 'resume' file.
*
* The other wrinkle is on the restore side: we need to IGNORE the 'state' property if a saved state now exists.
* So we have to peek at localStorage, and unfortunately, the only way to "peek" is to actually load the data,
* but we're not ready to use it yet, so powerUp() has been changed to use any existing stateComputer that we've
* already loaded.
*
* However, there's now a wrinkle to the wrinkle: if a 'state' parameter has been passed via the URL, then that
* OVERRIDES everything; it overrides any 'state' Computer parameter AND it disables resume of any saved state in
* localStorage (in other words, it prevents fAllowResume from being true, and forcing resume off).
*/
let fAllowResume = false;
let sState = Web.getURLParm('state');
if (!sState) {
fAllowResume = true;
sState = this.getMachineParm('state', parmsComputer);
}
if (sState) {
sStatePath = this.sStatePath = sState;
if (!fAllowResume) {
this.fServerState = true;
this.resume = Computer.RESUME_NONE;
}
if (this.resume) {
this.stateComputer = new State(this, PCx86.APPVERSION);
if (this.stateComputer.load()) {
sStatePath = null;
} else {
delete this.stateComputer;
}
}
}
/*
* If sStatePath is set, we must use it. But if there's no sStatePath AND resume is set,
* then we have the option of resuming from a server-side state, assuming a valid USERID.
*/
if (!sStatePath && this.resume) {
sStatePath = this.getServerStatePath();
if (sStatePath) this.fServerState = true;
}
this.sStateURL = sStatePath;
if (!this.sStateURL) {
this.setReady();
} else {
let sProgress = "Loading " + this.sStateURL + "...";
Web.getResource(this.sStateURL, null, true, function(sURL, sResource, nErrorCode) {
cmp.doneLoad(sURL, sResource, nErrorCode);
}, function(nState) {
cmp.println(sProgress, Component.PRINT.PROGRESS);
});
}
if (!this.bindings["power"]) this.fAutoPower = true;
/*
* Power on the computer, giving every component the opportunity to reset or restore itself.
*/
if (!fSuspended && this.fAutoPower) this.wait(this.powerOn);
}
/**
* clearPanel()
*
* @this {Computer}
*/
clearPanel()
{
if (this.controlPanel) {
this.controlPanel.value = "";
}
}
/**
* enableDiagnostics()
*
* @this {Computer}
*/
enableDiagnostics()
{
if (!this.cDiagnosticScreens) {
for (let i = 0; i < this.aVideo.length; i++) {
let video = this.aVideo[i];
if (video) {
let control = video.getTextArea();
if (control) {
/*
* By default, the Video textarea overlay has opacity and lineHeight styles set to "0"
* to make the overall textarea and its blinking caret invisible (respectively), so in order
* to use it as a diagnostic display, we must temporarily set both those styles to "1".
*/
control.style.opacity = "1";
control.style.lineHeight = "1";
// control.style.fontSize = "1.5vw"; // this is a nice idea, but it doesn't work well with side-by-side machines
this.cDiagnosticScreens++;
}
}
}
}
}
/**
* disableDiagnostics()
*
* @this {Computer}
* @return {boolean} (true if diagnostics were, or already are, disabled; false if they remain enabled)
*/
disableDiagnostics()
{
if (this.cDiagnosticScreens) {
if (this.nDiagnostics == 2) {
this.nDiagnostics++;
this.println("Press any key to continue...");
return false;
}
for (let i = 0; i < this.aVideo.length; i++) {
let video = this.aVideo[i];
if (video) {
let control = video.getTextArea();
if (control) {
/*
* Return the Video textarea overlay's opacity and lineHeight styles to their original values.
*/
control.style.opacity = "0";
control.style.lineHeight = "0";
/*
* Setting lineHeight in IE isn't sufficient to hide the caret; we must also set fontSize to "0",
* and we make the change IE-specific because it can have weird side-effects in other browsers (eg,
* it makes Safari on iOS over-zoom whenever the textarea receives focus).
*/
if (Web.isUserAgent("MSIE")) control.style.fontSize = "0";
/*
* We no longer clear the text, to give the user/system a chance to copy it to the clipboard.
*
* control.value = "";
*/
}
}
}
this.cDiagnosticScreens = 0;
}
this.nDiagnostics = 0;
return true;
}
/**
* outputDiagnostics(sMessage, sType)
*
* @this {Computer}
* @param {string} sMessage
* @param {string} [sType]
*/
outputDiagnostics(sMessage, sType)
{
if (this.cDiagnosticScreens) {
for (let i = 0; i < this.aVideo.length; i++) {
let video = this.aVideo[i];
if (video) {
let control = video.getTextArea();
if (control) {
if (sType != Component.PRINT.PROGRESS || sMessage.slice(-3) != "...") {
Component.appendControl(control, sMessage + '\n');
} else {
Component.replaceControl(control, sMessage, sMessage + '.');
}
}
}
}
}
}
/**
* notifyKbdEvent(event, fDown)
*
* This is called by the Keyboard component for all key presses, and it is effectively a no-op except
* in the one special case where disableDiagnostics() has delayed powerOn until a key is pressed.
*
* @this {Computer}
* @param {Object} [event]
* @param {boolean} [fDown] is true for a keyDown event, false for a keyUp event
* @return {boolean} (true if diagnostics disabled, false if enabled -- at the time of the call)
*/
notifyKbdEvent(event, fDown)
{
let nDiagnostics = this.nDiagnostics;
if (this.nDiagnostics == 3) {
this.nDiagnostics++;
this.setReady(); // this may trigger a call to disableDiagnostics(), which is why we snapshot nDiagnostics
}
return !nDiagnostics;
}
/**
* getMachineID()
*
* @this {Computer}
* @return {string}
*/
getMachineID()
{
return this.sMachineID;
}
/**
* setMachineParms(parmsMachine)
*
* If no explicit machine parms were provided, then we check for 'parms' in the bundled resources (if any).
*
* @this {Computer}
* @param {Object} [parmsMachine]
*/
setMachineParms(parmsMachine)
{
if (!parmsMachine) {
let sParms;
if (typeof resources == 'object' && (sParms = resources['parms'])) {
try {
parmsMachine = /** @type {Object} */ (eval("(" + sParms + ")")); // jshint ignore:line
} catch(err) {
Component.error(err.message + " (" + sParms + ")");
}
}
}
this.parmsMachine = parmsMachine;
}
/**
* getMachineBoolean(sParm, fDefault)
*
* Boolean-specific version of getMachineParm().
*
* @this {Computer}
* @param {string} sParm
* @param {boolean} fDefault
* @return {boolean}
*/
getMachineBoolean(sParm, fDefault)
{
let f = fDefault;
let s = this.getMachineParm(sParm);
if (s != undefined) {
f = (s == "true"? true : (s == "false"? false : !!s));
}
return f;
}
/**
* getMachineParm(sParm, parmsComponent)
*
* If the machine parameter doesn't exist, we check for a matching component parameter (if parmsComponent
* is provided), and failing that, we check the bundled resources (if any).
*
* At the moment, the only bundled resource request we expect to encounter is 'state'; if it exists, then
* we return 'state' back to the caller (ie, the name of the resource), so that the caller will then attempt
* to load the 'state' resource to obtain the actual state.
*
* TODO: This function could (and perhaps should) be modified to accept an optional type parameter (ie,
* one of the values in Component.TYPE), so that parms like autoMount could be eval'ed here rather than by
* the caller (eg, FDC.parseConfig()). The downside is that this function would have to return multiple types,
* so every call would have to be cast to the expected type.
*
* @this {Computer}
* @param {string} sParm
* @param {Object} [parmsComponent] (eg, this.parms)
* @return {string|undefined}
*/
getMachineParm(sParm, parmsComponent)
{
let value = Web.getURLParm(sParm);
if (value) {
try {
/*
* Ideally, we could simply use strings as-is, but unfortunately, we need to convert all
* supported escape sequences to their underlying characters, and using eval() is the simplest
* way to deal with them; eg:
*
* \', \", \r, \n, \t, and \xNN
*
* When a string containing the above sequences is passed as a machine or component parameter
* (ie, as an embedPC() machine parameter or as XML component attribute), that conversion happens
* automatically, either by virtue of implicit script evaluation, or by explicit eval() in
* getComponentParms(). But when they're passed as a URL parameter, any backslashes are passed
* through as-is.
*
* The complete list of backslash sequences supported by JavaScript:
*
* \0 \' \" \\ \n \r \v \t \b \f \uXXXX \xXX
* ^J ^M ^K ^I ^H ^L
*
* and of course, eval() will convert them all, but there's no expectation of any but those I've
* listed above, in part because of Jekyll limitations in some of our templates; eg:
*
* https://github.com/jeffpar/pcjs/blob/jekyll/_includes/machine-engines.html
*
* which could be overcome, but there's really no need to support more, since \xNN can be used to
* represent anything else.
*
* Finally, while the user should escape any quotation characters, just to be safe, we will try to
* choose the safest quoting character for the overall string.
*/
let ch = value.indexOf("'") >= 0? '"' : "'";
value = /** @type {string} */ (eval(ch + value + ch)); // jshint ignore:line
} catch(err) {
Component.error(err.message + " (" + value + ")");
value = undefined;
}
}
if (value === undefined && this.parmsMachine) {
value = this.parmsMachine[sParm];
}
if (value === undefined && parmsComponent) {
value = parmsComponent[sParm];
}
if (!value && typeof resources == 'object') {
if (resources[sParm]) {
value = sParm;
}
else {
try {
let parms = JSON.parse(resources['parms']);
value = parms[sParm];
}
catch(err) {
Component.error(err.message + " (" + resources['parms'] + ")");
}
}
}
return value;
}
/**
* saveMachineParms()
*
* @this {Computer}
* @return {string|null}
*/
saveMachineParms()
{
return this.parmsMachine? JSON.stringify(this.parmsMachine) : null;
}
/**
* getUserID()
*
* @this {Computer}
* @return {string}
*/
getUserID()
{
return this.sUserID || "";
}
/**
* doneLoad(sURL, sStateData, nErrorCode)
*
* @this {Computer}
* @param {string} sURL
* @param {string} sStateData
* @param {number} nErrorCode
*/
doneLoad(sURL, sStateData, nErrorCode)
{
if (!nErrorCode) {
Component.addMachineResource(this.idMachine, sURL, sStateData);
this.sStateData = sStateData;
this.fStateData = true;
if (DEBUG) this.printf("loaded state file %s\n", sURL.replace(this.sUserID || "xxx", "xxx"));
} else {
this.sResumePath = null;
this.fServerState = false;
this.notice('Unable to load machine state from server (error ' + nErrorCode + (sStateData? ': ' + Str.trim(sStateData) : '') + ')');
}
this.setReady();
}
/**
* wait(fn, parms)
*
* wait() waits until every component is ready (including ourselves, the last component we check), then calls the
* specified Computer method.
*
* TODO: The Closure Compiler makes it difficult for us to define a function type for "fn" that works in all cases;
* sometimes we want to pass a function that takes only a "number", and other times we want to pass a function that
* takes only an "Array" (the type will mirror that of the "parms" parameter). However, the Closure Compiler insists
* that both functions must be declared as accepting both types of parameters. So once again, we must use an untyped
* function declaration, instead of something stricter like:
*
* param {function(this:Computer, (number|Array|undefined)): undefined} fn
*
* @this {Computer}
* @param {function(...)} fn
* @param {number|Array} [parms] optional parameters
*/
wait(fn, parms)
{
let computer = this;
let aComponents = Component.getComponents(this.id);
for (let iComponent = 0; iComponent <= aComponents.length; iComponent++) {
let component = (iComponent < aComponents.length? aComponents[iComponent] : this);
if (!component.isReady()) {
component.isReady(function onComponentReady() {
computer.wait(fn, parms);
});
return;
}
}
if (DEBUG) this.printf("Computer.wait(ready)\n");
fn.call(this, parms);
}
/**
* validateState(stateComputer)
*
* NOTE: We clear() stateValidate only when there's no stateComputer.
*
* @this {Computer}
* @param {State|null} [stateComputer]
* @return {boolean} true if state passes validation, false if not
*/
validateState(stateComputer)
{
let fValid = true;
let stateValidate = new State(this, PCx86.APPVERSION, Computer.STATE_VALIDATE);
if (stateValidate.load() && stateValidate.parse()) {
let sTimestampValidate = stateValidate.get(Computer.STATE_TIMESTAMP);
let sTimestampComputer = stateComputer ? stateComputer.get(Computer.STATE_TIMESTAMP) : "unknown";
if (sTimestampValidate != sTimestampComputer) {
this.notice("Machine state may be out-of-date\n(" + sTimestampValidate + " vs. " + sTimestampComputer + ")\nCheck your browser's local storage limits");
fValid = false;
if (!stateComputer) stateValidate.clear();
} else {
if (DEBUG) this.printf("Last state: %s (validate: %s)\n", sTimestampComputer, sTimestampValidate);
}
}
return fValid;
}
/**
* powerOn(resume)
*
* Power every component "up", applying any previously available state information.
*
* @this {Computer}
* @param {number} [resume] is a valid RESUME value; default is this.resume
*/
powerOn(resume)
{
if (resume === undefined) {
resume = this.resume || (this.sStateData? Computer.RESUME_AUTO : Computer.RESUME_NONE);
}
if (DEBUG) this.printf("Computer.powerOn(%s)\n", (resume == Computer.RESUME_REPOWER ? "repower" : (resume ? "resume" : "")));
if (this.nPowerChange) {
return;
}
this.nPowerChange++;
let fRepower = false;
let fRestore = false;
this.fRestoreError = false;
let stateComputer = this.stateComputer || new State(this, PCx86.APPVERSION);
if (resume == Computer.RESUME_REPOWER) {
fRepower = true;
}
else if (resume > Computer.RESUME_NONE) {
if (stateComputer.load(this.sStateData)) {
/*
* Since we're resuming something (either a predefined state or a state from localStorage), let's
* create a "failsafe" checkpoint in localStorage, and destroy it at the end of a successful powerOn().
* Which means, of course, that if a previous "failsafe" checkpoint already exists, something bad
* may have happened the last time around.
*/
this.stateFailSafe = new State(this, PCx86.APPVERSION, Computer.STATE_FAILSAFE);
if (this.stateFailSafe.load()) {
if (resume != Computer.RESUME_AUTO && this.powerReport(stateComputer)) {
/*
* Prompt the user; if they decline to restore, the state will be removed.
*/
resume = Computer.RESUME_PROMPT;
}
/*
* To ensure that the set() below succeeds, we need to call unload(), otherwise it may fail
* with a "read only" error (eg, "TypeError: Cannot assign to read only property 'timestamp'").
*/
this.stateFailSafe.unload();
}
this.stateFailSafe.set(Computer.STATE_TIMESTAMP, Usr.getTimestamp());
this.stateFailSafe.store();
let fValidate = this.resume && !this.fServerState;
if (resume == Computer.RESUME_AUTO || Component.confirmUser("Click OK to restore the previous " + PCx86.APPNAME + " machine state.")) {
fRestore = stateComputer.parse();
if (fRestore) {
let sCode = stateComputer.get(UserAPI.RES.CODE);
let sData = stateComputer.get(UserAPI.RES.DATA);
if (sCode) {
if (sCode == UserAPI.CODE.OK) {
stateComputer.load(/** @type {string} */ (sData));
} else {
/*
* A missing (or not yet created) state file is no cause for alarm, but other errors might be
*/
if (sCode == UserAPI.CODE.FAIL && sData != UserAPI.FAIL.NOSTATE) {
this.notice("Error: " + sData);
if (sData == UserAPI.FAIL.VERIFY) this.resetUserID();
} else {
this.println(sCode + ": " + sData);
}
/*
* Try falling back to the state that we should have saved in localStorage, as a backup to the
* server-side state.
*/
stateComputer.unload(); // discard the invalid server-side state first
if (stateComputer.load()) {
fRestore = stateComputer.parse();
fValidate = true;
} else {
fRestore = false; // hmmm, there was nothing in localStorage either
}
}
}
}
/*
* If the load/parse was successful, and it was from localStorage (not sStateData),
* then we should to try verify that localStorage snapshot is current. One reason it may
* NOT be current is if localStorage was full and we got a quota error during the last
* powerOff().
*/
if (fValidate) this.validateState(fRestore? stateComputer : null);
} else {
/*
* RESUME_PROMPT indicates we should delete the state if they clicked Cancel to confirm() above.
*/
if (resume == Computer.RESUME_PROMPT) stateComputer.clear();
}
} else {
/*
* If there's no state, then there should also be no validation timestamp; if there is, then once again,
* we're probably dealing with a quota error.
*/
this.validateState();
}
delete this.sStateData;
delete this.stateComputer;
}
/*
* Start powering all components, including any data they may need to restore their state;
* we restore power to the CPU last.
*/
let aComponents = Component.getComponents(this.id);
for (let iComponent = 0; iComponent < aComponents.length; iComponent++) {
let component = aComponents[iComponent];
if (component !== this && component != this.cpu) {
try {
fRestore = this.powerRestore(component, stateComputer, fRepower, fRestore);
} catch(err) {
Component.error(component.type + " restore failure: " + err.message);
}
}
}
/*
* Assuming this is not a repower, we must perform another wait, because some components may
* have marked themselves as "not ready" again (eg, the FDC component, if the restore forced it
* to mount one or more additional disk images).
*/
let aParms = [stateComputer, resume, fRestore];
if (resume != Computer.RESUME_REPOWER) {
this.wait(this.donePowerOn, aParms);
return;
}
this.donePowerOn(aParms);
}
/**
* powerRestore(component, stateComputer, fRepower, fRestore)
*
* @this {Computer}
* @param {Component} component
* @param {State} stateComputer
* @param {boolean} fRepower
* @param {boolean} fRestore
* @return {boolean} true if restore should continue, false if not
*/
powerRestore(component, stateComputer, fRepower, fRestore)
{
if (!component.flags.powered) {
component.flags.powered = true;
if (component.powerUp) {
let data = null;
if (fRestore) {
data = stateComputer.get(component.id);
if (!data) {
/*
* This is a hack that makes it possible for a machine whose ID has been
* supplemented with a hyphenated numeric suffix to find object IDs in states
* created from a machine without such a suffix.
*
* For example, if a state file was created from a machine with ID "ibm5160"
* but the current machine is "ibm5160-1", this attempts a second lookup with
* "ibm5160", enabling us to find objects that match the original machine ID
* (eg, "ibm5160.romEGA").
*
* See /devices/pcx86/machine/5160/ega/640kb/array for examples of this.
*/
data = stateComputer.get(component.id.replace(/-[0-9]+\./i, '.'));
}
}
/*
* State.get() will return whatever was originally passed to State.set() (eg, an
* Object or a string), but components are supposed to store only Objects, so if a
* string comes back, something went wrong. By explicitly eliminating "string" data,
* the Closure Compiler stops complaining that we might be passing strings to our
* powerUp() functions (even though we know we're not). We could also add @type
* overrides to the data assignments, but this seems like a useful runtime check.
*/
if (typeof data === "string") data = null;
/*
* If computer is null, this is simply a repower notification, which most components
* don't do anything with. Exceptions include: CPU (since it may be halted) and Video
* (since its screen may be "turned off").
*/
if (!component.powerUp(data, fRepower) && data) {
if (component.notice("Unable to restore hardware state")) {
/*
* If this is a resume error for a machine that also has a predefined state
* AND we're not restoring from that state, then throw away the current state,
* prevent any new state from being created, and then force a reload, which will
* hopefully restore us to the functioning predefined state.
*
* TODO: Considering doing this in ALL cases, not just in situations where a
* 'state' exists but we're not actually resuming from it.
*/
if (this.sStatePath && !this.fStateData) {
stateComputer.clear();
this.resume = Computer.RESUME_NONE;
Web.reloadPage();
} else {
/*
* In all other cases, we set fRestoreError, which should trigger a call to
* powerReport() and then delete the offending state.
*/
this.fRestoreError = true;
}
}
/*
* Any failure triggers an automatic to call powerUp() again, without any state,
* in the hopes that the component can recover by performing a reset.
*/
component.powerUp(null);
/*
* We also disable the rest of the restore operation, because it's not clear
* the remaining state information can be trusted; the machine is already in an
* inconsistent state, so we're not likely to make things worse, and the only
* alternative (starting over and performing a state-less reset) isn't likely to make
* the user any happier. But, we'll see... we need some experience with the code.
*/
fRestore = false;
}
}
component.flags.initDone = true;
if (!fRepower && component.comment) {
let asComments = component.comment.split("|");
for (let i = 0; i < asComments.length; i++) {
component.status(asComments[i]);
}
}
}
return fRestore;
}
/**
* donePowerOn(aParms)
*
* This is nothing more than a continuation of powerOn(), giving us the option of calling wait() one more time.
*
* @this {Computer}
* @param {Array} aParms containing [stateComputer, resume, fRestore]
*/
donePowerOn(aParms)
{
if (!this.flags.initDone) {
if (!this.disableDiagnostics()) {
this.setReady(false);
this.wait(this.donePowerOn, aParms);
return;
}
this.flags.initDone = true;
}
if (DEBUG && this.flags.powered) this.printf("Computer.donePowerOn(): redundant\n");
let stateComputer = aParms[0];
let fRepower = (aParms[1] < 0);
let fRestore = aParms[2];