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OVMS3/OVMS.V3/components/duktape/debugger/duk_debug.js

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/*
* Minimal debug web console for Duktape command line tool
*
* See debugger/README.rst.
*
* The web UI socket.io communication can easily become a bottleneck and
* it's important to ensure that the web UI remains responsive. Basic rate
* limiting mechanisms (token buckets, suppressing identical messages, etc)
* are used here now. Ideally the web UI would pull data on its own terms
* which would provide natural rate limiting.
*
* Promises are used to structure callback chains.
*
* https://github.com/petkaantonov/bluebird
* https://github.com/petkaantonov/bluebird/blob/master/API.md
* https://github.com/petkaantonov/bluebird/wiki/Promise-anti-patterns
*/
var Promise = require('bluebird');
var events = require('events');
var stream = require('stream');
var path = require('path');
var fs = require('fs');
var net = require('net');
var byline = require('byline');
var util = require('util');
var readline = require('readline');
var sprintf = require('sprintf').sprintf;
var utf8 = require('utf8');
var yaml = require('yamljs');
var recursiveReadSync = require('recursive-readdir-sync');
// Command line options (defaults here, overwritten if necessary)
var optTargetHost = '127.0.0.1';
var optTargetPort = 9091;
var optHttpPort = 9092;
var optJsonProxyPort = 9093;
var optJsonProxy = false;
var optSourceSearchDirs = [ '../tests/ecmascript' ];
var optDumpDebugRead = null;
var optDumpDebugWrite = null;
var optDumpDebugPretty = null;
var optLogMessages = false;
// Constants
var UI_MESSAGE_CLIPLEN = 128;
var LOCALS_CLIPLEN = 64;
var EVAL_CLIPLEN = 4096;
var GETVAR_CLIPLEN = 4096;
var SUPPORTED_DEBUG_PROTOCOL_VERSION = 2;
// Commands initiated by Duktape
var CMD_STATUS = 0x01;
var CMD_UNUSED_2 = 0x02; // Duktape 1.x: print notify
var CMD_UNUSED_3 = 0x03; // Duktape 1.x: alert notify
var CMD_UNUSED_4 = 0x04; // Duktape 1.x: log notify
var CMD_THROW = 0x05;
var CMD_DETACHING = 0x06;
// Commands initiated by the debug client (= us)
var CMD_BASICINFO = 0x10;
var CMD_TRIGGERSTATUS = 0x11;
var CMD_PAUSE = 0x12;
var CMD_RESUME = 0x13;
var CMD_STEPINTO = 0x14;
var CMD_STEPOVER = 0x15;
var CMD_STEPOUT = 0x16;
var CMD_LISTBREAK = 0x17;
var CMD_ADDBREAK = 0x18;
var CMD_DELBREAK = 0x19;
var CMD_GETVAR = 0x1a;
var CMD_PUTVAR = 0x1b;
var CMD_GETCALLSTACK = 0x1c;
var CMD_GETLOCALS = 0x1d;
var CMD_EVAL = 0x1e;
var CMD_DETACH = 0x1f;
var CMD_DUMPHEAP = 0x20;
var CMD_GETBYTECODE = 0x21;
// Errors
var ERR_UNKNOWN = 0x00;
var ERR_UNSUPPORTED = 0x01;
var ERR_TOOMANY = 0x02;
var ERR_NOTFOUND = 0x03;
// Marker objects for special protocol values
var DVAL_EOM = { type: 'eom' };
var DVAL_REQ = { type: 'req' };
var DVAL_REP = { type: 'rep' };
var DVAL_ERR = { type: 'err' };
var DVAL_NFY = { type: 'nfy' };
// String map for commands (debug dumping). A single map works (instead of
// separate maps for each direction) because command numbers don't currently
// overlap. So merge the YAML metadata.
var debugCommandMeta = yaml.load('duk_debugcommands.yaml');
var debugCommandNames = []; // list of command names, merged client/target
debugCommandMeta.target_commands.forEach(function (k, i) {
debugCommandNames[i] = k;
});
debugCommandMeta.client_commands.forEach(function (k, i) { // override
debugCommandNames[i] = k;
});
var debugCommandNumbers = {}; // map from (merged) command name to number
debugCommandNames.forEach(function (k, i) {
debugCommandNumbers[k] = i;
});
// Duktape heaphdr type constants, must match C headers
var DUK_HTYPE_STRING = 0;
var DUK_HTYPE_OBJECT = 1;
var DUK_HTYPE_BUFFER = 2;
// Duktape internal class numbers, must match C headers
var dukClassNameMeta = yaml.load('duk_classnames.yaml');
var dukClassNames = dukClassNameMeta.class_names;
// Bytecode opcode/extraop metadata
var dukOpcodes = yaml.load('duk_opcodes.yaml');
if (dukOpcodes.opcodes.length != 256) {
throw new Error('opcode metadata length incorrect');
}
/*
* Miscellaneous helpers
*/
var nybbles = '0123456789abcdef';
/* Convert a buffer into a string using Unicode codepoints U+0000...U+00FF.
* This is the NodeJS 'binary' encoding, but since it's being deprecated,
* reimplement it here. We need to avoid parsing strings as e.g. UTF-8:
* although Duktape strings are usually UTF-8/CESU-8 that's not always the
* case, e.g. for internal strings. Buffer values are also represented as
* strings in the debug protocol, so we must deal accurately with arbitrary
* byte arrays.
*/
function bufferToDebugString(buf) {
var cp = [];
var i, n;
/*
// This fails with "RangeError: Maximum call stack size exceeded" for some
// reason, so use a much slower variant.
for (i = 0, n = buf.length; i < n; i++) {
cp[i] = buf[i];
}
return String.fromCharCode.apply(String, cp);
*/
for (i = 0, n = buf.length; i < n; i++) {
cp[i] = String.fromCharCode(buf[i]);
}
return cp.join('');
}
/* Write a string into a buffer interpreting codepoints U+0000...U+00FF
* as bytes. Drop higher bits.
*/
function writeDebugStringToBuffer(str, buf, off) {
var i, n;
for (i = 0, n = str.length; i < n; i++) {
buf[off + i] = str.charCodeAt(i) & 0xff; // truncate higher bits
}
}
/* Encode an ordinary Unicode string into a dvalue compatible format, i.e.
* into a byte array represented as codepoints U+0000...U+00FF. Concretely,
* encode with UTF-8 and then represent the bytes with U+0000...U+00FF.
*/
function stringToDebugString(str) {
return utf8.encode(str);
}
/* Pretty print a dvalue. Useful for dumping etc. */
function prettyDebugValue(x) {
if (typeof x === 'object' && x !== null) {
if (x.type === 'eom') {
return 'EOM';
} else if (x.type === 'req') {
return 'REQ';
} else if (x.type === 'rep') {
return 'REP';
} else if (x.type === 'err') {
return 'ERR';
} else if (x.type === 'nfy') {
return 'NFY';
}
}
return JSON.stringify(x);
}
/* Pretty print a number for UI usage. Types and values should be easy to
* read and typing should be obvious. For numbers, support Infinity, NaN,
* and signed zeroes properly.
*/
function prettyUiNumber(x) {
if (x === 1 / 0) { return 'Infinity'; }
if (x === -1 / 0) { return '-Infinity'; }
if (Number.isNaN(x)) { return 'NaN'; }
if (x === 0 && 1 / x > 0) { return '0'; }
if (x === 0 && 1 / x < 0) { return '-0'; }
return x.toString();
}
/* Pretty print a dvalue string (bytes represented as U+0000...U+00FF)
* for UI usage. Try UTF-8 decoding to get a nice Unicode string (JSON
* encoded) but if that fails, ensure that bytes are encoded transparently.
* The result is a quoted string with a special quote marker for a "raw"
* string when UTF-8 decoding fails. Very long strings are optionally
* clipped.
*/
function prettyUiString(x, cliplen) {
var ret;
if (typeof x !== 'string') {
throw new Error('invalid input to prettyUiString: ' + typeof x);
}
try {
// Here utf8.decode() is better than decoding using NodeJS buffer
// operations because we want strict UTF-8 interpretation.
ret = JSON.stringify(utf8.decode(x));
} catch (e) {
// When we fall back to representing bytes, indicate that the string
// is "raw" with a 'r"' prefix (a somewhat arbitrary convention).
// U+0022 = ", U+0027 = '
ret = 'r"' + x.replace(/[\u0022\u0027\u0000-\u001f\u0080-\uffff]/g, function (match) {
var cp = match.charCodeAt(0);
return '\\x' + nybbles[(cp >> 4) & 0x0f] + nybbles[cp & 0x0f];
}) + '"';
}
if (cliplen && ret.length > cliplen) {
ret = ret.substring(0, cliplen) + '...'; // trailing '"' intentionally missing
}
return ret;
}
/* Pretty print a dvalue string (bytes represented as U+0000...U+00FF)
* for UI usage without quotes.
*/
function prettyUiStringUnquoted(x, cliplen) {
var ret;
if (typeof x !== 'string') {
throw new Error('invalid input to prettyUiStringUnquoted: ' + typeof x);
}
try {
// Here utf8.decode() is better than decoding using NodeJS buffer
// operations because we want strict UTF-8 interpretation.
// XXX: unprintable characters etc? In some UI cases we'd want to
// e.g. escape newlines and in others not.
ret = utf8.decode(x);
} catch (e) {
// For the unquoted version we don't need to escape single or double
// quotes.
ret = x.replace(/[\u0000-\u001f\u0080-\uffff]/g, function (match) {
var cp = match.charCodeAt(0);
return '\\x' + nybbles[(cp >> 4) & 0x0f] + nybbles[cp & 0x0f];
});
}
if (cliplen && ret.length > cliplen) {
ret = ret.substring(0, cliplen) + '...';
}
return ret;
}
/* Pretty print a dvalue for UI usage. Everything comes out as a ready-to-use
* string.
*
* XXX: Currently the debug client formats all values for UI use. A better
* solution would be to pass values in typed form and let the UI format them,
* so that styling etc. could take typing into account.
*/
function prettyUiDebugValue(x, cliplen) {
if (typeof x === 'object' && x !== null) {
// Note: typeof null === 'object', so null special case explicitly
if (x.type === 'eom') {
return 'EOM';
} else if (x.type === 'req') {
return 'REQ';
} else if (x.type === 'rep') {
return 'REP';
} else if (x.type === 'err') {
return 'ERR';
} else if (x.type === 'nfy') {
return 'NFY';
} else if (x.type === 'unused') {
return 'unused';
} else if (x.type === 'undefined') {
return 'undefined';
} else if (x.type === 'buffer') {
return '|' + x.data + '|';
} else if (x.type === 'object') {
return '[object ' + (dukClassNames[x.class] || ('class ' + x.class)) + ' ' + x.pointer + ']';
} else if (x.type === 'pointer') {
return '<pointer ' + x.pointer + '>';
} else if (x.type === 'lightfunc') {
return '<lightfunc 0x' + x.flags.toString(16) + ' ' + x.pointer + '>';
} else if (x.type === 'number') {
// duk_tval number, any IEEE double
var tmp = new Buffer(x.data, 'hex'); // decode into hex
var val = tmp.readDoubleBE(0); // big endian ieee double
return prettyUiNumber(val);
}
} else if (x === null) {
return 'null';
} else if (typeof x === 'boolean') {
return x ? 'true' : 'false';
} else if (typeof x === 'string') {
return prettyUiString(x, cliplen);
} else if (typeof x === 'number') {
// Debug protocol integer
return prettyUiNumber(x);
}
// We shouldn't come here, but if we do, JSON is a reasonable default.
return JSON.stringify(x);
}
/* Pretty print a debugger message given as an array of parsed dvalues.
* Result should be a pure ASCII one-liner.
*/
function prettyDebugMessage(msg) {
return msg.map(prettyDebugValue).join(' ');
}
/* Pretty print a debugger command. */
function prettyDebugCommand(cmd) {
return debugCommandNames[cmd] || String(cmd);
}
/* Decode and normalize source file contents: UTF-8, tabs to 8,
* CR LF to LF.
*/
function decodeAndNormalizeSource(data) {
var tmp;
var lines, line, repl;
var i, n;
var j, m;
try {
tmp = data.toString('utf8');
} catch (e) {
console.log('Failed to UTF-8 decode source file, ignoring: ' + e);
tmp = String(data);
}
lines = tmp.split(/\r?\n/);
for (i = 0, n = lines.length; i < n; i++) {
line = lines[i];
if (/\t/.test(line)) {
repl = '';
for (j = 0, m = line.length; j < m; j++) {
if (line.charAt(j) === '\t') {
repl += ' ';
while ((repl.length % 8) != 0) {
repl += ' ';
}
} else {
repl += line.charAt(j);
}
}
lines[i] = repl;
}
}
// XXX: normalize last newline (i.e. force a newline if contents don't
// end with a newline)?
return lines.join('\n');
}
/* Token bucket rate limiter for a given callback. Calling code calls
* trigger() to request 'cb' to be called, and the rate limiter ensures
* that 'cb' is not called too often.
*/
function RateLimited(tokens, rate, cb) {
var _this = this;
this.maxTokens = tokens;
this.tokens = this.maxTokens;
this.rate = rate;
this.cb = cb;
this.delayedCb = false;
// Right now the implementation is setInterval-based, but could also be
// made timerless. There are so few rate limited resources that this
// doesn't matter in practice.
this.tokenAdder = setInterval(function () {
if (_this.tokens < _this.maxTokens) {
_this.tokens++;
}
if (_this.delayedCb) {
_this.delayedCb = false;
_this.tokens--;
_this.cb();
}
}, this.rate);
}
RateLimited.prototype.trigger = function () {
if (this.tokens > 0) {
this.tokens--;
this.cb();
} else {
this.delayedCb = true;
}
};
/*
* Source file manager
*
* Scan the list of search directories for ECMAScript source files and
* build an index of them. Provides a mechanism to find a source file
* based on a raw 'fileName' property provided by the debug target, and
* to provide a file list for the web UI.
*
* NOTE: it's tempting to do loose matching for filenames, but this does
* not work in practice. Filenames must match 1:1 with the debug target
* so that e.g. breakpoints assigned based on filenames found from the
* search paths will match 1:1 on the debug target. If this is not the
* case, breakpoints won't work as expected.
*/
function SourceFileManager(directories) {
this.directories = directories;
this.extensions = { '.js': true, '.jsm': true };
this.fileMap = {}; // filename as seen by debug target -> file path
this.files = []; // filenames as seen by debug target
}
SourceFileManager.prototype.scan = function () {
var _this = this;
var fileMap = {}; // relative path -> file path
var files;
this.directories.forEach(function (dir) {
console.log('Scanning source files: ' + dir);
try {
recursiveReadSync(dir).forEach(function (fn) {
// Example: dir ../../tests
// normFn ../../tests/foo/bar.js
// relFn foo/bar.js
var normDir = path.normalize(dir);
var normFn = path.normalize(fn);
var relFn = path.relative(normDir, normFn);
if (fs.existsSync(normFn) && fs.lstatSync(normFn).isFile() &&
_this.extensions[path.extname(normFn)]) {
// We want the fileMap to contain the filename relative to
// the search dir root. First directory containing a
// certail relFn wins.
if (relFn in fileMap) {
console.log('Found', relFn, 'multiple times, first match wins');
} else {
fileMap[relFn] = normFn;
}
}
});
} catch (e) {
console.log('Failed to scan ' + dir + ': ' + e);
}
});
files = Object.keys(fileMap);
files.sort();
this.files = files;
this.fileMap = fileMap;
console.log('Found ' + files.length + ' source files in ' + this.directories.length + ' search directories');
};
SourceFileManager.prototype.getFiles = function () {
return this.files;
};
SourceFileManager.prototype.search = function (fileName) {
var _this = this;
// Loose matching is tempting but counterproductive: filenames must
// match 1:1 between the debug client and the debug target for e.g.
// breakpoints to work as expected. Note that a breakpoint may be
// assigned by selecting a file from a dropdown populated by scanning
// the filesystem for available sources and there's no way of knowing
// if the debug target uses the exact same name.
//
// We intentionally allow any files from the search paths, not just
// those scanned to this.fileMap.
function tryLookup() {
var i, fn, data;
for (i = 0; i < _this.directories.length; i++) {
fn = path.join(_this.directories[i], fileName);
if (fs.existsSync(fn) && fs.lstatSync(fn).isFile()) {
data = fs.readFileSync(fn); // Raw bytes
return decodeAndNormalizeSource(data); // Unicode string
}
}
return null;
}
return tryLookup(fileName);
};
/*
* Debug protocol parser
*
* The debug protocol parser is an EventEmitter which parses debug messages
* from an input stream and emits 'debug-message' events for completed
* messages ending in an EOM. The parser also provides debug dumping, stream
* logging functionality, and statistics gathering functionality.
*
* This parser is used to parse both incoming and outgoing messages. For
* outgoing messages the only function is to validate and debug dump the
* messages we're about to send. The downside of dumping at this low level
* is that we can't match request and reply/error messages here.
*
* http://www.sitepoint.com/nodejs-events-and-eventemitter/
*/
function DebugProtocolParser(inputStream,
protocolVersion,
rawDumpFileName,
textDumpFileName,
textDumpFilePrefix,
hexDumpConsolePrefix,
textDumpConsolePrefix) {
var _this = this;
this.inputStream = inputStream;
this.closed = false; // stream is closed/broken, don't parse anymore
this.bytes = 0;
this.dvalues = 0;
this.messages = 0;
this.requests = 0;
this.prevBytes = 0;
this.bytesPerSec = 0;
this.statsTimer = null;
this.readableNumberValue = true;
events.EventEmitter.call(this);
var buf = new Buffer(0); // accumulate data
var msg = []; // accumulated message until EOM
var versionIdentification;
var statsInterval = 2000;
var statsIntervalSec = statsInterval / 1000;
this.statsTimer = setInterval(function () {
_this.bytesPerSec = (_this.bytes - _this.prevBytes) / statsIntervalSec;
_this.prevBytes = _this.bytes;
_this.emit('stats-update');
}, statsInterval);
function consume(n) {
var tmp = new Buffer(buf.length - n);
buf.copy(tmp, 0, n);
buf = tmp;
}
inputStream.on('data', function (data) {
var i, n, x, v, gotValue, len, t, tmpbuf, verstr;
var prettyMsg;
if (_this.closed || !_this.inputStream) {
console.log('Ignoring incoming data from closed input stream, len ' + data.length);
return;
}
_this.bytes += data.length;
if (rawDumpFileName) {
fs.appendFileSync(rawDumpFileName, data);
}
if (hexDumpConsolePrefix) {
console.log(hexDumpConsolePrefix + data.toString('hex'));
}
buf = Buffer.concat([ buf, data ]);
// Protocol version handling. When dumping an output stream, the
// caller gives a non-null protocolVersion so we don't read one here.
if (protocolVersion == null) {
if (buf.length > 1024) {
_this.emit('transport-error', 'Parse error (version identification too long), dropping connection');
_this.close();
return;
}
for (i = 0, n = buf.length; i < n; i++) {
if (buf[i] == 0x0a) {
tmpbuf = new Buffer(i);
buf.copy(tmpbuf, 0, 0, i);
consume(i + 1);
verstr = tmpbuf.toString('utf-8');
t = verstr.split(' ');
protocolVersion = Number(t[0]);
versionIdentification = verstr;
_this.emit('protocol-version', {
protocolVersion: protocolVersion,
versionIdentification: versionIdentification
});
break;
}
}
if (protocolVersion == null) {
// Still waiting for version identification to complete.
return;
}
}
// Parse complete dvalues (quite inefficient now) by trial parsing.
// Consume a value only when it's fully present in 'buf'.
// See doc/debugger.rst for format description.
while (buf.length > 0) {
x = buf[0];
v = undefined;
gotValue = false; // used to flag special values like undefined
if (x >= 0xc0) {
// 0xc0...0xff: integers 0-16383
if (buf.length >= 2) {
v = ((x - 0xc0) << 8) + buf[1];
consume(2);
}
} else if (x >= 0x80) {
// 0x80...0xbf: integers 0-63
v = x - 0x80;
consume(1);
} else if (x >= 0x60) {
// 0x60...0x7f: strings with length 0-31
len = x - 0x60;
if (buf.length >= 1 + len) {
v = new Buffer(len);
buf.copy(v, 0, 1, 1 + len);
v = bufferToDebugString(v);
consume(1 + len);
}
} else {
switch (x) {
case 0x00: v = DVAL_EOM; consume(1); break;
case 0x01: v = DVAL_REQ; consume(1); break;
case 0x02: v = DVAL_REP; consume(1); break;
case 0x03: v = DVAL_ERR; consume(1); break;
case 0x04: v = DVAL_NFY; consume(1); break;
case 0x10: // 4-byte signed integer
if (buf.length >= 5) {
v = buf.readInt32BE(1);
consume(5);
}
break;
case 0x11: // 4-byte string
if (buf.length >= 5) {
len = buf.readUInt32BE(1);
if (buf.length >= 5 + len) {
v = new Buffer(len);
buf.copy(v, 0, 5, 5 + len);
v = bufferToDebugString(v);
consume(5 + len);
}
}
break;
case 0x12: // 2-byte string
if (buf.length >= 3) {
len = buf.readUInt16BE(1);
if (buf.length >= 3 + len) {
v = new Buffer(len);
buf.copy(v, 0, 3, 3 + len);
v = bufferToDebugString(v);
consume(3 + len);
}
}
break;
case 0x13: // 4-byte buffer
if (buf.length >= 5) {
len = buf.readUInt32BE(1);
if (buf.length >= 5 + len) {
v = new Buffer(len);
buf.copy(v, 0, 5, 5 + len);
v = { type: 'buffer', data: v.toString('hex') };
consume(5 + len);
// Value could be a Node.js buffer directly, but
// we prefer all dvalues to be JSON compatible
}
}
break;
case 0x14: // 2-byte buffer
if (buf.length >= 3) {
len = buf.readUInt16BE(1);
if (buf.length >= 3 + len) {
v = new Buffer(len);
buf.copy(v, 0, 3, 3 + len);
v = { type: 'buffer', data: v.toString('hex') };
consume(3 + len);
// Value could be a Node.js buffer directly, but
// we prefer all dvalues to be JSON compatible
}
}
break;
case 0x15: // unused/none
v = { type: 'unused' };
consume(1);
break;
case 0x16: // undefined
v = { type: 'undefined' };
gotValue = true; // indicate 'v' is actually set
consume(1);
break;
case 0x17: // null
v = null;
gotValue = true; // indicate 'v' is actually set
consume(1);
break;
case 0x18: // true
v = true;
consume(1);
break;
case 0x19: // false
v = false;
consume(1);
break;
case 0x1a: // number (IEEE double), big endian
if (buf.length >= 9) {
v = new Buffer(8);
buf.copy(v, 0, 1, 9);
v = { type: 'number', data: v.toString('hex') };
if (_this.readableNumberValue) {
// The value key should not be used programmatically,
// it is just there to make the dumps more readable.
v.value = buf.readDoubleBE(1);
}
consume(9);
}
break;
case 0x1b: // object
if (buf.length >= 3) {
len = buf[2];
if (buf.length >= 3 + len) {
v = new Buffer(len);
buf.copy(v, 0, 3, 3 + len);
v = { type: 'object', 'class': buf[1], pointer: v.toString('hex') };
consume(3 + len);
}
}
break;
case 0x1c: // pointer
if (buf.length >= 2) {
len = buf[1];
if (buf.length >= 2 + len) {
v = new Buffer(len);
buf.copy(v, 0, 2, 2 + len);
v = { type: 'pointer', pointer: v.toString('hex') };
consume(2 + len);
}
}
break;
case 0x1d: // lightfunc
if (buf.length >= 4) {
len = buf[3];
if (buf.length >= 4 + len) {
v = new Buffer(len);
buf.copy(v, 0, 4, 4 + len);
v = { type: 'lightfunc', flags: buf.readUInt16BE(1), pointer: v.toString('hex') };
consume(4 + len);
}
}
break;
case 0x1e: // heapptr
if (buf.length >= 2) {
len = buf[1];
if (buf.length >= 2 + len) {
v = new Buffer(len);
buf.copy(v, 0, 2, 2 + len);
v = { type: 'heapptr', pointer: v.toString('hex') };
consume(2 + len);
}
}
break;
default:
_this.emit('transport-error', 'Parse error, dropping connection');
_this.close();
}
}
if (typeof v === 'undefined' && !gotValue) {
break;
}
msg.push(v);
_this.dvalues++;
// Could emit a 'debug-value' event here, but that's not necessary
// because the receiver will just collect statistics which can also
// be done using the finished message.
if (v === DVAL_EOM) {
_this.messages++;
if (textDumpFileName || textDumpConsolePrefix) {
prettyMsg = prettyDebugMessage(msg);
if (textDumpFileName) {
fs.appendFileSync(textDumpFileName, (textDumpFilePrefix || '') + prettyMsg + '\n');
}
if (textDumpConsolePrefix) {
console.log(textDumpConsolePrefix + prettyMsg);
}
}
_this.emit('debug-message', msg);
msg = []; // new object, old may be in circulation for a while
}
}
});
// Not all streams will emit this.
inputStream.on('error', function (err) {
_this.emit('transport-error', err);
_this.close();
});
// Not all streams will emit this.
inputStream.on('close', function () {
_this.close();
});
}
DebugProtocolParser.prototype = Object.create(events.EventEmitter.prototype);
DebugProtocolParser.prototype.close = function () {
// Although the underlying transport may not have a close() or destroy()
// method or even a 'close' event, this method is always available and
// will generate a 'transport-close'.
//
// The caller is responsible for closing the underlying stream if that
// is necessary.
if (this.closed) { return; }
this.closed = true;
if (this.statsTimer) {
clearInterval(this.statsTimer);
this.statsTimer = null;
}
this.emit('transport-close');
};
/*
* Debugger output formatting
*/
function formatDebugValue(v) {
var buf, dec, len;
// See doc/debugger.rst for format description.
if (typeof v === 'object' && v !== null) {
// Note: typeof null === 'object', so null special case explicitly
if (v.type === 'eom') {
return new Buffer([ 0x00 ]);
} else if (v.type === 'req') {
return new Buffer([ 0x01 ]);
} else if (v.type === 'rep') {
return new Buffer([ 0x02 ]);
} else if (v.type === 'err') {
return new Buffer([ 0x03 ]);
} else if (v.type === 'nfy') {
return new Buffer([ 0x04 ]);
} else if (v.type === 'unused') {
return new Buffer([ 0x15 ]);
} else if (v.type === 'undefined') {
return new Buffer([ 0x16 ]);
} else if (v.type === 'number') {
dec = new Buffer(v.data, 'hex');
len = dec.length;
if (len !== 8) {
throw new TypeError('value cannot be converted to dvalue: ' + JSON.stringify(v));
}
buf = new Buffer(1 + len);
buf[0] = 0x1a;
dec.copy(buf, 1);
return buf;
} else if (v.type === 'buffer') {
dec = new Buffer(v.data, 'hex');
len = dec.length;
if (len <= 0xffff) {
buf = new Buffer(3 + len);
buf[0] = 0x14;
buf[1] = (len >> 8) & 0xff;
buf[2] = (len >> 0) & 0xff;
dec.copy(buf, 3);
return buf;
} else {
buf = new Buffer(5 + len);
buf[0] = 0x13;
buf[1] = (len >> 24) & 0xff;
buf[2] = (len >> 16) & 0xff;
buf[3] = (len >> 8) & 0xff;
buf[4] = (len >> 0) & 0xff;
dec.copy(buf, 5);
return buf;
}
} else if (v.type === 'object') {
dec = new Buffer(v.pointer, 'hex');
len = dec.length;
buf = new Buffer(3 + len);
buf[0] = 0x1b;
buf[1] = v.class;
buf[2] = len;
dec.copy(buf, 3);
return buf;
} else if (v.type === 'pointer') {
dec = new Buffer(v.pointer, 'hex');
len = dec.length;
buf = new Buffer(2 + len);
buf[0] = 0x1c;
buf[1] = len;
dec.copy(buf, 2);
return buf;
} else if (v.type === 'lightfunc') {
dec = new Buffer(v.pointer, 'hex');
len = dec.length;
buf = new Buffer(4 + len);
buf[0] = 0x1d;
buf[1] = (v.flags >> 8) & 0xff;
buf[2] = v.flags & 0xff;
buf[3] = len;
dec.copy(buf, 4);
return buf;
} else if (v.type === 'heapptr') {
dec = new Buffer(v.pointer, 'hex');
len = dec.length;
buf = new Buffer(2 + len);
buf[0] = 0x1e;
buf[1] = len;
dec.copy(buf, 2);
return buf;
}
} else if (v === null) {
return new Buffer([ 0x17 ]);
} else if (typeof v === 'boolean') {
return new Buffer([ v ? 0x18 : 0x19 ]);
} else if (typeof v === 'number') {
if (Math.floor(v) === v && /* whole */
(v !== 0 || 1 / v > 0) && /* not negative zero */
v >= -0x80000000 && v <= 0x7fffffff) {
// Represented signed 32-bit integers as plain integers.
// Debugger code expects this for all fields that are not
// duk_tval representations (e.g. command numbers and such).
if (v >= 0x00 && v <= 0x3f) {
return new Buffer([ 0x80 + v ]);
} else if (v >= 0x0000 && v <= 0x3fff) {
return new Buffer([ 0xc0 + (v >> 8), v & 0xff ]);
} else if (v >= -0x80000000 && v <= 0x7fffffff) {
return new Buffer([ 0x10,
(v >> 24) & 0xff,
(v >> 16) & 0xff,
(v >> 8) & 0xff,
(v >> 0) & 0xff ]);
} else {
throw new Error('internal error when encoding integer to dvalue: ' + v);
}
} else {
// Represent non-integers as IEEE double dvalues
buf = new Buffer(1 + 8);
buf[0] = 0x1a;
buf.writeDoubleBE(v, 1);
return buf;
}
} else if (typeof v === 'string') {
if (v.length < 0 || v.length > 0xffffffff) {
// Not possible in practice.
throw new TypeError('cannot convert to dvalue, invalid string length: ' + v.length);
}
if (v.length <= 0x1f) {
buf = new Buffer(1 + v.length);
buf[0] = 0x60 + v.length;
writeDebugStringToBuffer(v, buf, 1);
return buf;
} else if (v.length <= 0xffff) {
buf = new Buffer(3 + v.length);
buf[0] = 0x12;
buf[1] = (v.length >> 8) & 0xff;
buf[2] = (v.length >> 0) & 0xff;
writeDebugStringToBuffer(v, buf, 3);
return buf;
} else {
buf = new Buffer(5 + v.length);
buf[0] = 0x11;
buf[1] = (v.length >> 24) & 0xff;
buf[2] = (v.length >> 16) & 0xff;
buf[3] = (v.length >> 8) & 0xff;
buf[4] = (v.length >> 0) & 0xff;
writeDebugStringToBuffer(v, buf, 5);
return buf;
}
}
// Shouldn't come here.
throw new TypeError('value cannot be converted to dvalue: ' + JSON.stringify(v));
}
/*
* Debugger implementation
*
* A debugger instance communicates with the debug target and maintains
* persistent debug state so that the current state can be resent to the
* socket.io client (web UI) if it reconnects. Whenever the debugger state
* is changed an event is generated. The socket.io handler will listen to
* state change events and push the necessary updates to the web UI, often
* in a rate limited fashion or using a client pull to ensure the web UI
* is not overloaded.
*
* The debugger instance assumes that if the debug protocol connection is
* re-established, it is always to the same target. There is no separate
* abstraction for a debugger session.
*/
function Debugger() {
events.EventEmitter.call(this);
this.web = null; // web UI singleton
this.targetStream = null; // transport connection to target
this.outputPassThroughStream = null; // dummy passthrough for message dumping
this.inputParser = null; // parser for incoming debug messages
this.outputParser = null; // parser for outgoing debug messages (stats, dumping)
this.protocolVersion = null;
this.dukVersion = null;
this.dukGitDescribe = null;
this.targetInfo = null;
this.attached = false;
this.handshook = false;
this.reqQueue = null;
this.stats = { // stats for current debug connection
rxBytes: 0, rxDvalues: 0, rxMessages: 0, rxBytesPerSec: 0,
txBytes: 0, txDvalues: 0, txMessages: 0, txBytesPerSec: 0
};
this.execStatus = {
attached: false,
state: 'detached',
fileName: '',
funcName: '',
line: 0,
pc: 0
};
this.breakpoints = [];
this.callstack = [];
this.locals = [];
this.messageLines = [];
this.messageScrollBack = 100;
}
Debugger.prototype = events.EventEmitter.prototype;
Debugger.prototype.decodeBytecodeFromBuffer = function (buf, consts, funcs) {
var i, j, n, m, ins, pc;
var res = [];
var op, str, args, comments;
// XXX: add constants inline to preformatted output (e.g. for strings,
// add a short escaped snippet as a comment on the line after the
// compact argument list).
for (i = 0, n = buf.length; i < n; i += 4) {
pc = i / 4;
// shift forces unsigned
if (this.endianness === 'little') {
ins = buf.readInt32LE(i) >>> 0;
} else {
ins = buf.readInt32BE(i) >>> 0;
}
op = dukOpcodes.opcodes[ins & 0xff];
args = [];
comments = [];
if (op.args) {
for (j = 0, m = op.args.length; j < m; j++) {
var A = (ins >>> 8) & 0xff;
var B = (ins >>> 16) & 0xff;
var C = (ins >>> 24) & 0xff;
var BC = (ins >>> 16) & 0xffff;
var ABC = (ins >>> 8) & 0xffffff;
var Bconst = op & 0x01;
var Cconst = op & 0x02;
switch (op.args[j]) {
case 'A_R': args.push('r' + A); break;
case 'A_RI': args.push('r' + A + '(indirect)'); break;
case 'A_C': args.push('c' + A); break;
case 'A_H': args.push('0x' + A.toString(16)); break;
case 'A_I': args.push(A.toString(10)); break;
case 'A_B': args.push(A ? 'true' : 'false'); break;
case 'B_RC': args.push((Bconst ? 'c' : 'r') + B); break;
case 'B_R': args.push('r' + B); break;
case 'B_RI': args.push('r' + B + '(indirect)'); break;
case 'B_C': args.push('c' + B); break;
case 'B_H': args.push('0x' + B.toString(16)); break;
case 'B_I': args.push(B.toString(10)); break;
case 'C_RC': args.push((Cconst ? 'c' : 'r') + C); break;
case 'C_R': args.push('r' + C); break;
case 'C_RI': args.push('r' + C + '(indirect)'); break;
case 'C_C': args.push('c' + C); break;
case 'C_H': args.push('0x' + C.toString(16)); break;
case 'C_I': args.push(C.toString(10)); break;
case 'BC_R': args.push('r' + BC); break;
case 'BC_C': args.push('c' + BC); break;
case 'BC_H': args.push('0x' + BC.toString(16)); break;
case 'BC_I': args.push(BC.toString(10)); break;
case 'ABC_H': args.push(ABC.toString(16)); break;
case 'ABC_I': args.push(ABC.toString(10)); break;
case 'BC_LDINT': args.push(BC - (1 << 15)); break;
case 'BC_LDINTX': args.push(BC - 0); break; // no bias in LDINTX
case 'ABC_JUMP': {
var pc_add = ABC - (1 << 23) + 1; // pc is preincremented before adding
var pc_dst = pc + pc_add;
args.push(pc_dst + ' (' + (pc_add >= 0 ? '+' : '') + pc_add + ')');
break;
}
default: args.push('?'); break;
}
}
}
if (op.flags) {
for (j = 0, m = op.flags.length; j < m; j++) {
if (ins & op.flags[j].mask) {
comments.push(op.flags[j].name);
}
}
}
if (args.length > 0) {
str = sprintf('%05d %08x %-12s %s', pc, ins, op.name, args.join(', '));
} else {
str = sprintf('%05d %08x %-12s', pc, ins, op.name);
}
if (comments.length > 0) {
str = sprintf('%-44s ; %s', str, comments.join(', '));
}
res.push({
str: str,
ins: ins
});
}
return res;
};
Debugger.prototype.uiMessage = function (type, val) {
var msg;
if (typeof type === 'object') {
msg = type;
} else if (typeof type === 'string') {
msg = { type: type, message: val };
} else {
throw new TypeError('invalid ui message: ' + type);
}
this.messageLines.push(msg);
while (this.messageLines.length > this.messageScrollBack) {
this.messageLines.shift();
}
this.emit('ui-message-update'); // just trigger a sync, gets rate limited
};
Debugger.prototype.sendRequest = function (msg) {
var _this = this;
return new Promise(function (resolve, reject) {
var dvals = [];
var dval;
var data;
var i;
if (!_this.attached || !_this.handshook || !_this.reqQueue || !_this.targetStream) {
throw new Error('invalid state for sendRequest');
}
for (i = 0; i < msg.length; i++) {
try {
dval = formatDebugValue(msg[i]);
} catch (e) {
console.log('Failed to format dvalue, dropping connection: ' + e);
console.log(e.stack || e);
_this.targetStream.destroy();
throw new Error('failed to format dvalue');
}
dvals.push(dval);
}
data = Buffer.concat(dvals);
_this.targetStream.write(data);
_this.outputPassThroughStream.write(data); // stats and dumping
if (optLogMessages) {
console.log('Request ' + prettyDebugCommand(msg[1]) + ': ' + prettyDebugMessage(msg));
}
if (!_this.reqQueue) {
throw new Error('no reqQueue');
}
_this.reqQueue.push({
reqMsg: msg,
reqCmd: msg[1],
resolveCb: resolve,
rejectCb: reject
});
});
};
Debugger.prototype.sendBasicInfoRequest = function () {
var _this = this;
return this.sendRequest([ DVAL_REQ, CMD_BASICINFO, DVAL_EOM ]).then(function (msg) {
_this.dukVersion = msg[1];
_this.dukGitDescribe = msg[2];
_this.targetInfo = msg[3];
_this.endianness = { 1: 'little', 2: 'mixed', 3: 'big' }[msg[4]] || 'unknown';
_this.emit('basic-info-update');
return msg;
});
};
Debugger.prototype.sendGetVarRequest = function (varname, level) {
var _this = this;
return this.sendRequest([ DVAL_REQ, CMD_GETVAR, (typeof level === 'number' ? level : -1), varname, DVAL_EOM ]).then(function (msg) {
return { found: msg[1] === 1, value: msg[2] };
});
};
Debugger.prototype.sendPutVarRequest = function (varname, varvalue, level) {
var _this = this;
return this.sendRequest([ DVAL_REQ, CMD_PUTVAR, (typeof level === 'number' ? level : -1), varname, varvalue, DVAL_EOM ]);
};
Debugger.prototype.sendInvalidCommandTestRequest = function () {
// Intentional invalid command
var _this = this;
return this.sendRequest([ DVAL_REQ, 0xdeadbeef, DVAL_EOM ]);
};
Debugger.prototype.sendStatusRequest = function () {
// Send a status request to trigger a status notify, result is ignored:
// target sends a status notify instead of a meaningful reply
var _this = this;
return this.sendRequest([ DVAL_REQ, CMD_TRIGGERSTATUS, DVAL_EOM ]);
};
Debugger.prototype.sendBreakpointListRequest = function () {
var _this = this;
return this.sendRequest([ DVAL_REQ, CMD_LISTBREAK, DVAL_EOM ]).then(function (msg) {
var i, n;
var breakpts = [];
for (i = 1, n = msg.length - 1; i < n; i += 2) {
breakpts.push({ fileName: msg[i], lineNumber: msg[i + 1] });
}
_this.breakpoints = breakpts;
_this.emit('breakpoints-update');
return msg;
});
};
Debugger.prototype.sendGetLocalsRequest = function (level) {
var _this = this;
return this.sendRequest([ DVAL_REQ, CMD_GETLOCALS, (typeof level === 'number' ? level : -1), DVAL_EOM ]).then(function (msg) {
var i;
var locals = [];
for (i = 1; i <= msg.length - 2; i += 2) {
// XXX: do pretty printing in debug client for now
locals.push({ key: msg[i], value: prettyUiDebugValue(msg[i + 1], LOCALS_CLIPLEN) });
}
_this.locals = locals;
_this.emit('locals-update');
return msg;
});
};
Debugger.prototype.sendGetCallStackRequest = function () {
var _this = this;
return this.sendRequest([ DVAL_REQ, CMD_GETCALLSTACK, DVAL_EOM ]).then(function (msg) {
var i;
var stack = [];
for (i = 1; i + 3 <= msg.length - 1; i += 4) {
stack.push({
fileName: msg[i],
funcName: msg[i + 1],
lineNumber: msg[i + 2],
pc: msg[i + 3]
});
}
_this.callstack = stack;
_this.emit('callstack-update');
return msg;
});
};
Debugger.prototype.sendStepIntoRequest = function () {
var _this = this;
return this.sendRequest([ DVAL_REQ, CMD_STEPINTO, DVAL_EOM ]);
};
Debugger.prototype.sendStepOverRequest = function () {
var _this = this;
return this.sendRequest([ DVAL_REQ, CMD_STEPOVER, DVAL_EOM ]);
};
Debugger.prototype.sendStepOutRequest = function () {
var _this = this;
return this.sendRequest([ DVAL_REQ, CMD_STEPOUT, DVAL_EOM ]);
};
Debugger.prototype.sendPauseRequest = function () {
var _this = this;
return this.sendRequest([ DVAL_REQ, CMD_PAUSE, DVAL_EOM ]);
};
Debugger.prototype.sendResumeRequest = function () {
var _this = this;
return this.sendRequest([ DVAL_REQ, CMD_RESUME, DVAL_EOM ]);
};
Debugger.prototype.sendEvalRequest = function (evalInput, level) {
var _this = this;
// Use explicit level if given. If no level is given, use null if the call
// stack is empty, -1 otherwise. This works well when we're paused and the
// callstack information is not liable to change before we do an Eval.
if (typeof level !== 'number') {
level = this.callstack && this.callstack.length > 0 ? -1 : null;
}
return this.sendRequest([ DVAL_REQ, CMD_EVAL, level, evalInput, DVAL_EOM ]).then(function (msg) {
return { error: msg[1] === 1 /*error*/, value: msg[2] };
});
};
Debugger.prototype.sendDetachRequest = function () {
var _this = this;
return this.sendRequest([ DVAL_REQ, CMD_DETACH, DVAL_EOM ]);
};
Debugger.prototype.sendDumpHeapRequest = function () {
var _this = this;
return this.sendRequest([ DVAL_REQ, CMD_DUMPHEAP, DVAL_EOM ]).then(function (msg) {
var res = {};
var objs = [];
var i, j, n, m, o, prop;
res.type = 'heapDump';
res.heapObjects = objs;
for (i = 1, n = msg.length - 1; i < n; /*nop*/) {
o = {};
o.ptr = msg[i++];
o.type = msg[i++];
o.flags = msg[i++] >>> 0; /* unsigned */
o.refc = msg[i++];
if (o.type === DUK_HTYPE_STRING) {
o.blen = msg[i++];
o.clen = msg[i++];
o.hash = msg[i++] >>> 0; /* unsigned */
o.data = msg[i++];
} else if (o.type === DUK_HTYPE_BUFFER) {
o.len = msg[i++];
o.data = msg[i++];
} else if (o.type === DUK_HTYPE_OBJECT) {
o['class'] = msg[i++];
o.proto = msg[i++];
o.esize = msg[i++];
o.enext = msg[i++];
o.asize = msg[i++];
o.hsize = msg[i++];
o.props = [];
for (j = 0, m = o.enext; j < m; j++) {
prop = {};
prop.flags = msg[i++];
prop.key = msg[i++];
prop.accessor = (msg[i++] == 1);
if (prop.accessor) {
prop.getter = msg[i++];
prop.setter = msg[i++];
} else {
prop.value = msg[i++];
}
o.props.push(prop);
}
o.array = [];
for (j = 0, m = o.asize; j < m; j++) {
prop = {};
prop.value = msg[i++];
o.array.push(prop);
}
} else {
console.log('invalid htype: ' + o.type + ', disconnect');
_this.disconnectDebugger();
throw new Error('invalid htype');
return;
}
objs.push(o);
}
return res;
});
};
Debugger.prototype.sendGetBytecodeRequest = function () {
var _this = this;
return this.sendRequest([ DVAL_REQ, CMD_GETBYTECODE, -1 /* level; could be other than -1 too */, DVAL_EOM ]).then(function (msg) {
var idx = 1;
var nconst;
var nfunc;
var val;
var buf;
var i, n;
var consts = [];
var funcs = [];
var bcode;
var preformatted;
var ret;
var idxPreformattedInstructions;
//console.log(JSON.stringify(msg));
nconst = msg[idx++];
for (i = 0; i < nconst; i++) {
val = msg[idx++];
consts.push(val);
}
nfunc = msg[idx++];
for (i = 0; i < nfunc; i++) {
val = msg[idx++];
funcs.push(val);
}
val = msg[idx++];
// Right now bytecode is a string containing a direct dump of the
// bytecode in target endianness. Decode here so that the web UI
// doesn't need to.
buf = new Buffer(val.length);
writeDebugStringToBuffer(val, buf, 0);
bcode = _this.decodeBytecodeFromBuffer(buf, consts, funcs);
preformatted = [];
consts.forEach(function (v, i) {
preformatted.push('; c' + i + ' ' + JSON.stringify(v));
});
preformatted.push('');
idxPreformattedInstructions = preformatted.length;
bcode.forEach(function (v) {
preformatted.push(v.str);
});
preformatted = preformatted.join('\n') + '\n';
ret = {
constants: consts,
functions: funcs,
bytecode: bcode,
preformatted: preformatted,
idxPreformattedInstructions: idxPreformattedInstructions
};
return ret;
});
};
Debugger.prototype.changeBreakpoint = function (fileName, lineNumber, mode) {
var _this = this;
return this.sendRequest([ DVAL_REQ, CMD_LISTBREAK, DVAL_EOM ]).then(function (msg) {
var i, n;
var breakpts = [];
var deleted = false;
// Up-to-date list of breakpoints on target
for (i = 1, n = msg.length - 1; i < n; i += 2) {
breakpts.push({ fileName: msg[i], lineNumber: msg[i + 1] });
}
// Delete matching breakpoints in reverse order so that indices
// remain valid. We do this for all operations so that duplicates
// are eliminated if present.
for (i = breakpts.length - 1; i >= 0; i--) {
var bp = breakpts[i];
if (mode === 'deleteall' || (bp.fileName === fileName && bp.lineNumber === lineNumber)) {
deleted = true;
_this.sendRequest([ DVAL_REQ, CMD_DELBREAK, i, DVAL_EOM ], function (msg) {
// nop
}, function (err) {
// nop
});
}
}
// Technically we should wait for each delbreak reply but because
// target processes the requests in order, it doesn't matter.
if ((mode === 'add') || (mode === 'toggle' && !deleted)) {
_this.sendRequest([ DVAL_REQ, CMD_ADDBREAK, fileName, lineNumber, DVAL_EOM ], function (msg) {
// nop
}, function (err) {
_this.uiMessage('debugger-info', 'Failed to add breakpoint: ' + err);
});
}
// Read final, effective breakpoints from the target
_this.sendBreakpointListRequest();
});
};
Debugger.prototype.disconnectDebugger = function () {
if (this.targetStream) {
// We require a destroy() method from the actual target stream
this.targetStream.destroy();
this.targetStream = null;
}
if (this.inputParser) {
this.inputParser.close();
this.inputParser = null;
}
if (this.outputPassThroughStream) {
// There is no close() or destroy() for a passthrough stream, so just
// close the outputParser which will cancel timers etc.
}
if (this.outputParser) {
this.outputParser.close();
this.outputParser = null;
}
this.attached = false;
this.handshook = false;
this.reqQueue = null;
this.execStatus = {
attached: false,
state: 'detached',
fileName: '',
funcName: '',
line: 0,
pc: 0
};
};
Debugger.prototype.connectDebugger = function () {
var _this = this;
this.disconnectDebugger(); // close previous target connection
// CUSTOMTRANSPORT: to use a custom transport, change this.targetStream to
// use your custom transport.
console.log('Connecting to ' + optTargetHost + ':' + optTargetPort + '...');
this.targetStream = new net.Socket();
this.targetStream.connect(optTargetPort, optTargetHost, function () {
console.log('Debug transport connected');
_this.attached = true;
_this.reqQueue = [];
_this.uiMessage('debugger-info', 'Debug transport connected');
});
this.inputParser = new DebugProtocolParser(
this.targetStream,
null,
optDumpDebugRead,
optDumpDebugPretty,
optDumpDebugPretty ? 'Recv: ' : null,
null,
null // console logging is done at a higher level to match request/response
);
// Use a PassThrough stream to debug dump and get stats for output messages.
// Simply write outgoing data to both the targetStream and this passthrough
// separately.
this.outputPassThroughStream = stream.PassThrough();
this.outputParser = new DebugProtocolParser(
this.outputPassThroughStream,
1,
optDumpDebugWrite,
optDumpDebugPretty,
optDumpDebugPretty ? 'Send: ' : null,
null,
null // console logging is done at a higher level to match request/response
);
this.inputParser.on('transport-close', function () {
_this.uiMessage('debugger-info', 'Debug transport closed');
_this.disconnectDebugger();
_this.emit('exec-status-update');
_this.emit('detached');
});
this.inputParser.on('transport-error', function (err) {
_this.uiMessage('debugger-info', 'Debug transport error: ' + err);
_this.disconnectDebugger();
});
this.inputParser.on('protocol-version', function (msg) {
var ver = msg.protocolVersion;
console.log('Debug version identification:', msg.versionIdentification);
_this.protocolVersion = ver;
_this.uiMessage('debugger-info', 'Debug version identification: ' + msg.versionIdentification);
if (ver !== SUPPORTED_DEBUG_PROTOCOL_VERSION) {
console.log('Unsupported debug protocol version (got ' + ver + ', support ' + SUPPORTED_DEBUG_PROTOCOL_VERSION + ')');
_this.uiMessage('debugger-info', 'Protocol version ' + ver + ' unsupported, dropping connection');
_this.targetStream.destroy();
} else {
_this.uiMessage('debugger-info', 'Debug protocol version: ' + ver);
_this.handshook = true;
_this.execStatus = {
attached: true,
state: 'attached',
fileName: '',
funcName: '',
line: 0,
pc: 0
};
_this.emit('exec-status-update');
_this.emit('attached'); // inform web UI
// Fetch basic info right away
_this.sendBasicInfoRequest();
}
});
this.inputParser.on('debug-message', function (msg) {
_this.processDebugMessage(msg);
});
this.inputParser.on('stats-update', function () {
_this.stats.rxBytes = this.bytes;
_this.stats.rxDvalues = this.dvalues;
_this.stats.rxMessages = this.messages;
_this.stats.rxBytesPerSec = this.bytesPerSec;
_this.emit('debug-stats-update');
});
this.outputParser.on('stats-update', function () {
_this.stats.txBytes = this.bytes;
_this.stats.txDvalues = this.dvalues;
_this.stats.txMessages = this.messages;
_this.stats.txBytesPerSec = this.bytesPerSec;
_this.emit('debug-stats-update');
});
};
Debugger.prototype.processDebugMessage = function (msg) {
var req;
var prevState, newState;
var err;
if (msg[0] === DVAL_REQ) {
// No actual requests sent by the target right now (just notifys).
console.log('Unsolicited reply message, dropping connection: ' + prettyDebugMessage(msg));
} else if (msg[0] === DVAL_REP) {
if (this.reqQueue.length <= 0) {
console.log('Unsolicited reply message, dropping connection: ' + prettyDebugMessage(msg));
this.targetStream.destroy();
}
req = this.reqQueue.shift();
if (optLogMessages) {
console.log('Reply for ' + prettyDebugCommand(req.reqCmd) + ': ' + prettyDebugMessage(msg));
}
if (req.resolveCb) {
req.resolveCb(msg);
} else {
// nop: no callback
}
} else if (msg[0] === DVAL_ERR) {
if (this.reqQueue.length <= 0) {
console.log('Unsolicited error message, dropping connection: ' + prettyDebugMessage(msg));
this.targetStream.destroy();
}
err = new Error(String(msg[2]) + ' (code ' + String(msg[1]) + ')');
err.errorCode = msg[1] || 0;
req = this.reqQueue.shift();
if (optLogMessages) {
console.log('Error for ' + prettyDebugCommand(req.reqCmd) + ': ' + prettyDebugMessage(msg));
}
if (req.rejectCb) {
req.rejectCb(err);
} else {
// nop: no callback
}
} else if (msg[0] === DVAL_NFY) {
if (optLogMessages) {
console.log('Notify ' + prettyDebugCommand(msg[1]) + ': ' + prettyDebugMessage(msg));
}
if (msg[1] === CMD_STATUS) {
prevState = this.execStatus.state;
newState = msg[2] === 0 ? 'running' : 'paused';
this.execStatus = {
attached: true,
state: newState,
fileName: msg[3],
funcName: msg[4],
line: msg[5],
pc: msg[6]
};
if (prevState !== newState && newState === 'paused') {
// update run state now that we're paused
this.sendBreakpointListRequest();
this.sendGetLocalsRequest();
this.sendGetCallStackRequest();
}
this.emit('exec-status-update');
} else if (msg[1] === CMD_THROW) {
this.uiMessage({ type: 'throw', fatal: msg[2], message: (msg[2] ? 'UNCAUGHT: ' : 'THROW: ') + prettyUiStringUnquoted(msg[3], UI_MESSAGE_CLIPLEN), fileName: msg[4], lineNumber: msg[5] });
} else if (msg[1] === CMD_DETACHING) {
this.uiMessage({ type: 'detaching', reason: msg[2], message: 'DETACH: ' + (msg.length >= 5 ? prettyUiStringUnquoted(msg[3]) : 'detaching') });
} else {
// Ignore unknown notify messages
console.log('Unknown notify, ignoring: ' + prettyDebugMessage(msg));
//this.targetStream.destroy();
}
} else {
console.log('Invalid initial dvalue, dropping connection: ' + prettyDebugMessage(msg));
this.targetStream.destroy();
}
};
Debugger.prototype.run = function () {
var _this = this;
// Initial debugger connection
this.connectDebugger();
// Poll various state items when running
var sendRound = 0;
var statusPending = false;
var bplistPending = false;
var localsPending = false;
var callStackPending = false;
setInterval(function () {
if (_this.execStatus.state !== 'running') {
return;
}
// Could also check for an empty request queue, but that's probably
// too strict?
// Pending flags are used to avoid requesting the same thing twice
// while a previous request is pending. The flag-based approach is
// quite awkward. Rework to use promises.
switch (sendRound) {
case 0:
if (!statusPending) {
statusPending = true;
_this.sendStatusRequest().finally(function () { statusPending = false; });
}
break;
case 1:
if (!bplistPending) {
bplistPending = true;
_this.sendBreakpointListRequest().finally(function () { bplistPending = false; });
}
break;
case 2:
if (!localsPending) {
localsPending = true;
_this.sendGetLocalsRequest().finally(function () { localsPending = false; });
}
break;
case 3:
if (!callStackPending) {
callStackPending = true;
_this.sendGetCallStackRequest().finally(function () { callStackPending = false; });
}
break;
}
sendRound = (sendRound + 1) % 4;
}, 500);
};
/*
* Express setup and socket.io
*/
function DebugWebServer() {
this.dbg = null; // debugger singleton
this.socket = null; // current socket (or null)
this.keepaliveTimer = null;
this.uiMessageLimiter = null;
this.cachedJson = {}; // cache to avoid resending identical data
this.sourceFileManager = new SourceFileManager(optSourceSearchDirs);
this.sourceFileManager.scan();
}
DebugWebServer.prototype.handleSourcePost = function (req, res) {
var fileName = req.body && req.body.fileName;
var fileData;
console.log('Source request: ' + fileName);
if (typeof fileName !== 'string') {
res.status(500).send('invalid request');
return;
}
fileData = this.sourceFileManager.search(fileName, optSourceSearchDirs);
if (typeof fileData !== 'string') {
res.status(404).send('not found');
return;
}
res.status(200).send(fileData); // UTF-8
};
DebugWebServer.prototype.handleSourceListPost = function (req, res) {
console.log('Source list request');
var files = this.sourceFileManager.getFiles();
res.header('Content-Type', 'application/json');
res.status(200).json(files);
};
DebugWebServer.prototype.handleHeapDumpGet = function (req, res) {
console.log('Heap dump get');
this.dbg.sendDumpHeapRequest().then(function (val) {
res.header('Content-Type', 'application/json');
//res.status(200).json(val);
res.status(200).send(JSON.stringify(val, null, 4));
}).catch(function (err) {
res.status(500).send('Failed to get heap dump: ' + (err.stack || err));
});
};
DebugWebServer.prototype.run = function () {
var _this = this;
var express = require('express');
var bodyParser = require('body-parser');
var app = express();
var http = require('http').Server(app);
var io = require('socket.io')(http);
app.use(bodyParser.json());
app.post('/source', this.handleSourcePost.bind(this));
app.post('/sourceList', this.handleSourceListPost.bind(this));
app.get('/heapDump.json', this.handleHeapDumpGet.bind(this));
app.use('/', express.static(__dirname + '/static'));
http.listen(optHttpPort, function () {
console.log('Listening on *:' + optHttpPort);
});
io.on('connection', this.handleNewSocketIoConnection.bind(this));
this.dbg.on('attached', function () {
console.log('Debugger attached');
});
this.dbg.on('detached', function () {
console.log('Debugger detached');
});
this.dbg.on('debug-stats-update', function () {
_this.debugStatsLimiter.trigger();
});
this.dbg.on('ui-message-update', function () {
// Explicit rate limiter because this is a source of a lot of traffic.
_this.uiMessageLimiter.trigger();
});
this.dbg.on('basic-info-update', function () {
_this.emitBasicInfo();
});
this.dbg.on('breakpoints-update', function () {
_this.emitBreakpoints();
});
this.dbg.on('exec-status-update', function () {
// Explicit rate limiter because this is a source of a lot of traffic.
_this.execStatusLimiter.trigger();
});
this.dbg.on('locals-update', function () {
_this.emitLocals();
});
this.dbg.on('callstack-update', function () {
_this.emitCallStack();
});
this.uiMessageLimiter = new RateLimited(10, 1000, this.uiMessageLimiterCallback.bind(this));
this.execStatusLimiter = new RateLimited(50, 500, this.execStatusLimiterCallback.bind(this));
this.debugStatsLimiter = new RateLimited(1, 2000, this.debugStatsLimiterCallback.bind(this));
this.keepaliveTimer = setInterval(this.emitKeepalive.bind(this), 30000);
};
DebugWebServer.prototype.handleNewSocketIoConnection = function (socket) {
var _this = this;
console.log('Socket.io connected');
if (this.socket) {
console.log('Closing previous socket.io socket');
this.socket.emit('replaced');
}
this.socket = socket;
this.emitKeepalive();
socket.on('disconnect', function () {
console.log('Socket.io disconnected');
if (_this.socket === socket) {
_this.socket = null;
}
});
socket.on('keepalive', function (msg) {
// nop
});
socket.on('attach', function (msg) {
if (_this.dbg.targetStream) {
console.log('Attach request when debugger already has a connection, ignoring');
} else {
_this.dbg.connectDebugger();
}
});
socket.on('detach', function (msg) {
// Try to detach cleanly, timeout if no response
Promise.any([
_this.dbg.sendDetachRequest(),
Promise.delay(3000)
]).finally(function () {
_this.dbg.disconnectDebugger();
});
});
socket.on('stepinto', function (msg) {
_this.dbg.sendStepIntoRequest();
});
socket.on('stepover', function (msg) {
_this.dbg.sendStepOverRequest();
});
socket.on('stepout', function (msg) {
_this.dbg.sendStepOutRequest();
});
socket.on('pause', function (msg) {
_this.dbg.sendPauseRequest();
});
socket.on('resume', function (msg) {
_this.dbg.sendResumeRequest();
});
socket.on('eval', function (msg) {
// msg.input is a proper Unicode strings here, and needs to be
// converted into a protocol string (U+0000...U+00FF).
var input = stringToDebugString(msg.input);
_this.dbg.sendEvalRequest(input, msg.level).then(function (v) {
socket.emit('eval-result', { error: v.error, result: prettyUiDebugValue(v.value, EVAL_CLIPLEN) });
});
// An eval call quite possibly changes the local variables so always
// re-read locals afterwards. We don't need to wait for Eval to
// complete here; the requests will pipeline automatically and be
// executed in order.
// XXX: move this to the web UI so that the UI can control what
// locals are listed (or perhaps show locals for all levels with
// an expandable tree view).
_this.dbg.sendGetLocalsRequest();
});
socket.on('getvar', function (msg) {
// msg.varname is a proper Unicode strings here, and needs to be
// converted into a protocol string (U+0000...U+00FF).
var varname = stringToDebugString(msg.varname);
_this.dbg.sendGetVarRequest(varname, msg.level)
.then(function (v) {
socket.emit('getvar-result', { found: v.found, result: prettyUiDebugValue(v.value, GETVAR_CLIPLEN) });
});
});
socket.on('putvar', function (msg) {
// msg.varname and msg.varvalue are proper Unicode strings here, they
// need to be converted into protocol strings (U+0000...U+00FF).
var varname = stringToDebugString(msg.varname);
var varvalue = msg.varvalue;
// varvalue is JSON parsed by the web UI for now, need special string
// encoding here.
if (typeof varvalue === 'string') {
varvalue = stringToDebugString(msg.varvalue);
}
_this.dbg.sendPutVarRequest(varname, varvalue, msg.level)
.then(function (v) {
console.log('putvar done'); // XXX: signal success to UI?
});
// A PutVar call quite possibly changes the local variables so always
// re-read locals afterwards. We don't need to wait for PutVar to
// complete here; the requests will pipeline automatically and be
// executed in order.
// XXX: make the client do this?
_this.dbg.sendGetLocalsRequest();
});
socket.on('add-breakpoint', function (msg) {
_this.dbg.changeBreakpoint(msg.fileName, msg.lineNumber, 'add');
});
socket.on('delete-breakpoint', function (msg) {
_this.dbg.changeBreakpoint(msg.fileName, msg.lineNumber, 'delete');
});
socket.on('toggle-breakpoint', function (msg) {
_this.dbg.changeBreakpoint(msg.fileName, msg.lineNumber, 'toggle');
});
socket.on('delete-all-breakpoints', function (msg) {
_this.dbg.changeBreakpoint(null, null, 'deleteall');
});
socket.on('get-bytecode', function (msg) {
_this.dbg.sendGetBytecodeRequest().then(function (res) {
socket.emit('bytecode', res);
});
});
// Resend all debugger state for new client
this.cachedJson = {}; // clear client state cache
this.emitBasicInfo();
this.emitStats();
this.emitExecStatus();
this.emitUiMessages();
this.emitBreakpoints();
this.emitCallStack();
this.emitLocals();
};
// Check if 'msg' would encode to the same JSON which was previously sent
// to the web client. The caller then avoid resending unnecessary stuff.
DebugWebServer.prototype.cachedJsonCheck = function (cacheKey, msg) {
var newJson = JSON.stringify(msg);
if (this.cachedJson[cacheKey] === newJson) {
return true; // cached
}
this.cachedJson[cacheKey] = newJson;
return false; // not cached, send (cache already updated)
};
DebugWebServer.prototype.uiMessageLimiterCallback = function () {
this.emitUiMessages();
};
DebugWebServer.prototype.execStatusLimiterCallback = function () {
this.emitExecStatus();
};
DebugWebServer.prototype.debugStatsLimiterCallback = function () {
this.emitStats();
};
DebugWebServer.prototype.emitKeepalive = function () {
if (!this.socket) { return; }
this.socket.emit('keepalive', { nodeVersion: process.version });
};
DebugWebServer.prototype.emitBasicInfo = function () {
if (!this.socket) { return; }
var newMsg = {
duk_version: this.dbg.dukVersion,
duk_git_describe: this.dbg.dukGitDescribe,
target_info: this.dbg.targetInfo,
endianness: this.dbg.endianness
};
if (this.cachedJsonCheck('basic-info', newMsg)) {
return;
}
this.socket.emit('basic-info', newMsg);
};
DebugWebServer.prototype.emitStats = function () {
if (!this.socket) { return; }
this.socket.emit('debug-stats', this.dbg.stats);
};
DebugWebServer.prototype.emitExecStatus = function () {
if (!this.socket) { return; }
var newMsg = this.dbg.execStatus;
if (this.cachedJsonCheck('exec-status', newMsg)) {
return;
}
this.socket.emit('exec-status', newMsg);
};
DebugWebServer.prototype.emitUiMessages = function () {
if (!this.socket) { return; }
var newMsg = this.dbg.messageLines;
if (this.cachedJsonCheck('output-lines', newMsg)) {
return;
}
this.socket.emit('output-lines', newMsg);
};
DebugWebServer.prototype.emitBreakpoints = function () {
if (!this.socket) { return; }
var newMsg = { breakpoints: this.dbg.breakpoints };
if (this.cachedJsonCheck('breakpoints', newMsg)) {
return;
}
this.socket.emit('breakpoints', newMsg);
};
DebugWebServer.prototype.emitCallStack = function () {
if (!this.socket) { return; }
var newMsg = { callstack: this.dbg.callstack };
if (this.cachedJsonCheck('callstack', newMsg)) {
return;
}
this.socket.emit('callstack', newMsg);
};
DebugWebServer.prototype.emitLocals = function () {
if (!this.socket) { return; }
var newMsg = { locals: this.dbg.locals };
if (this.cachedJsonCheck('locals', newMsg)) {
return;
}
this.socket.emit('locals', newMsg);
};
/*
* JSON debug proxy
*/
function DebugProxy(serverPort) {
this.serverPort = serverPort;
this.server = null;
this.socket = null;
this.targetStream = null;
this.inputParser = null;
// preformatted dvalues
this.dval_eom = formatDebugValue(DVAL_EOM);
this.dval_req = formatDebugValue(DVAL_REQ);
this.dval_rep = formatDebugValue(DVAL_REP);
this.dval_nfy = formatDebugValue(DVAL_NFY);
this.dval_err = formatDebugValue(DVAL_ERR);
}
DebugProxy.prototype.determineCommandNumber = function (cmdName, cmdNumber) {
var ret;
if (typeof cmdName === 'string') {
ret = debugCommandNumbers[cmdName];
} else if (typeof cmdName === 'number') {
ret = cmdName;
}
ret = ret || cmdNumber;
if (typeof ret !== 'number') {
throw Error('cannot figure out command number for "' + cmdName + '" (' + cmdNumber + ')');
}
return ret;
};
DebugProxy.prototype.commandNumberToString = function (id) {
return debugCommandNames[id] || String(id);
};
DebugProxy.prototype.formatDvalues = function (args) {
if (!args) {
return [];
}
return args.map(function (v) {
return formatDebugValue(v);
});
};
DebugProxy.prototype.writeJson = function (val) {
this.socket.write(JSON.stringify(val) + '\n');
};
DebugProxy.prototype.writeJsonSafe = function (val) {
try {
this.writeJson(val);
} catch (e) {
console.log('Failed to write JSON in writeJsonSafe, ignoring: ' + e);
}
};
DebugProxy.prototype.disconnectJsonClient = function () {
if (this.socket) {
this.socket.destroy();
this.socket = null;
}
};
DebugProxy.prototype.disconnectTarget = function () {
if (this.inputParser) {
this.inputParser.close();
this.inputParser = null;
}
if (this.targetStream) {
this.targetStream.destroy();
this.targetStream = null;
}
};
DebugProxy.prototype.run = function () {
var _this = this;
console.log('Waiting for client connections on port ' + this.serverPort);
this.server = net.createServer(function (socket) {
console.log('JSON proxy client connected');
_this.disconnectJsonClient();
_this.disconnectTarget();
// A byline-parser is simple and good enough for now (assume
// compact JSON with no newlines).
var socketByline = byline(socket);
_this.socket = socket;
socketByline.on('data', function (line) {
try {
// console.log('Received json proxy input line: ' + line.toString('utf8'));
var msg = JSON.parse(line.toString('utf8'));
var first_dval;
var args_dvalues = _this.formatDvalues(msg.args);
var last_dval = _this.dval_eom;
var cmd;
if (msg.request) {
// "request" can be a string or "true"
first_dval = _this.dval_req;
cmd = _this.determineCommandNumber(msg.request, msg.command);
} else if (msg.reply) {
first_dval = _this.dval_rep;
} else if (msg.notify) {
// "notify" can be a string or "true"
first_dval = _this.dval_nfy;
cmd = _this.determineCommandNumber(msg.notify, msg.command);
} else if (msg.error) {
first_dval = _this.dval_err;
} else {
throw new Error('Invalid input JSON message: ' + JSON.stringify(msg));
}
_this.targetStream.write(first_dval);
if (cmd) {
_this.targetStream.write(formatDebugValue(cmd));
}
args_dvalues.forEach(function (v) {
_this.targetStream.write(v);
});
_this.targetStream.write(last_dval);
} catch (e) {
console.log(e);
_this.writeJsonSafe({
notify: '_Error',
args: [ 'Failed to handle input json message: ' + e ]
});
_this.disconnectJsonClient();
_this.disconnectTarget();
}
});
_this.connectToTarget();
}).listen(this.serverPort);
};
DebugProxy.prototype.connectToTarget = function () {
var _this = this;
console.log('Connecting to ' + optTargetHost + ':' + optTargetPort + '...');
this.targetStream = new net.Socket();
this.targetStream.connect(optTargetPort, optTargetHost, function () {
console.log('Debug transport connected');
});
this.inputParser = new DebugProtocolParser(
this.targetStream,
null,
optDumpDebugRead,
optDumpDebugPretty,
optDumpDebugPretty ? 'Recv: ' : null,
null,
null // console logging is done at a higher level to match request/response
);
// Don't add a 'value' key to numbers.
this.inputParser.readableNumberValue = false;
this.inputParser.on('transport-close', function () {
console.log('Debug transport closed');
_this.writeJsonSafe({
notify: '_Disconnecting'
});
_this.disconnectJsonClient();
_this.disconnectTarget();
});
this.inputParser.on('transport-error', function (err) {
console.log('Debug transport error', err);
_this.writeJsonSafe({
notify: '_Error',
args: [ String(err) ]
});
});
this.inputParser.on('protocol-version', function (msg) {
var ver = msg.protocolVersion;
console.log('Debug version identification:', msg.versionIdentification);
_this.writeJson({
notify: '_TargetConnected',
args: [ msg.versionIdentification ] // raw identification string
});
if (ver !== 1) {
console.log('Protocol version ' + ver + ' unsupported, dropping connection');
}
});
this.inputParser.on('debug-message', function (msg) {
var t;
//console.log(msg);
if (typeof msg[0] !== 'object' || msg[0] === null) {
throw new Error('unexpected initial dvalue: ' + msg[0]);
} else if (msg[0].type === 'eom') {
throw new Error('unexpected initial dvalue: ' + msg[0]);
} else if (msg[0].type === 'req') {
if (typeof msg[1] !== 'number') {
throw new Error('unexpected request command number: ' + msg[1]);
}
t = {
request: _this.commandNumberToString(msg[1]),
command: msg[1],
args: msg.slice(2, msg.length - 1)
};
_this.writeJson(t);
} else if (msg[0].type === 'rep') {
t = {
reply: true,
args: msg.slice(1, msg.length - 1)
};
_this.writeJson(t);
} else if (msg[0].type === 'err') {
t = {
error: true,
args: msg.slice(1, msg.length - 1)
};
_this.writeJson(t);
} else if (msg[0].type === 'nfy') {
if (typeof msg[1] !== 'number') {
throw new Error('unexpected notify command number: ' + msg[1]);
}
t = {
notify: _this.commandNumberToString(msg[1]),
command: msg[1],
args: msg.slice(2, msg.length - 1)
};
_this.writeJson(t);
} else {
throw new Error('unexpected initial dvalue: ' + msg[0]);
}
});
this.inputParser.on('stats-update', function () {
});
};
/*
* Command line parsing and initialization
*/
function main() {
console.log('((o) Duktape debugger');
// Parse arguments.
var argv = require('minimist')(process.argv.slice(2));
//console.dir(argv);
if (argv['target-host']) {
optTargetHost = argv['target-host'];
}
if (argv['target-port']) {
optTargetPort = argv['target-port'];
}
if (argv['http-port']) {
optHttpPort = argv['http-port'];
}
if (argv['json-proxy-port']) {
optJsonProxyPort = argv['json-proxy-port'];
}
if (argv['json-proxy']) {
optJsonProxy = argv['json-proxy'];
}
if (argv['source-dirs']) {
optSourceSearchDirs = argv['source-dirs'].split(path.delimiter);
}
if (argv['dump-debug-read']) {
optDumpDebugRead = argv['dump-debug-read'];
}
if (argv['dump-debug-write']) {
optDumpDebugWrite = argv['dump-debug-write'];
}
if (argv['dump-debug-pretty']) {
optDumpDebugPretty = argv['dump-debug-pretty'];
}
if (argv['log-messages']) {
optLogMessages = true;
}
// Dump effective options. Also provides a list of option names.
console.log('');
console.log('Effective options:');
console.log(' --target-host: ' + optTargetHost);
console.log(' --target-port: ' + optTargetPort);
console.log(' --http-port: ' + optHttpPort);
console.log(' --json-proxy-port: ' + optJsonProxyPort);
console.log(' --json-proxy: ' + optJsonProxy);
console.log(' --source-dirs: ' + optSourceSearchDirs.join(' '));
console.log(' --dump-debug-read: ' + optDumpDebugRead);
console.log(' --dump-debug-write: ' + optDumpDebugWrite);
console.log(' --dump-debug-pretty: ' + optDumpDebugPretty);
console.log(' --log-messages: ' + optLogMessages);
console.log('');
// Create debugger and web UI singletons, tie them together and
// start them.
if (optJsonProxy) {
console.log('Starting in JSON proxy mode, JSON port: ' + optJsonProxyPort);
var prx = new DebugProxy(optJsonProxyPort);
prx.run();
} else {
var dbg = new Debugger();
var web = new DebugWebServer();
dbg.web = web;
web.dbg = dbg;
dbg.run();
web.run();
}
}
main();
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