v8/tools/logreader.js

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// Copyright 2011 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following
// disclaimer in the documentation and/or other materials provided
// with the distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
/**
* @fileoverview Log Reader is used to process log file produced by V8.
*/
/**
* Base class for processing log files.
*
* @param {Array.<Object>} dispatchTable A table used for parsing and processing
* log records.
* @param {boolean} timedRange Ignore ticks outside timed range.
* @constructor
*/
function LogReader(dispatchTable, timedRange) {
/**
* @type {Array.<Object>}
*/
this.dispatchTable_ = dispatchTable;
/**
* @type {boolean}
*/
this.timedRange_ = timedRange;
/**
* Current line.
* @type {number}
*/
this.lineNum_ = 0;
/**
* CSV lines parser.
* @type {CsvParser}
*/
this.csvParser_ = new CsvParser();
/**
* Keeps track of whether we've seen a "current-time" tick yet.
* @type {boolean}
*/
this.hasSeenTimerMarker_ = false;
/**
* List of log lines seen since last "current-time" tick.
* @type {Array.<String>}
*/
this.logLinesSinceLastTimerMarker_ = [];
};
/**
* Used for printing error messages.
*
* @param {string} str Error message.
*/
LogReader.prototype.printError = function(str) {
// Do nothing.
};
/**
* Processes a portion of V8 profiler event log.
*
* @param {string} chunk A portion of log.
*/
LogReader.prototype.processLogChunk = function(chunk) {
this.processLog_(chunk.split('\n'));
};
/**
* Processes a line of V8 profiler event log.
*
* @param {string} line A line of log.
*/
LogReader.prototype.processLogLine = function(line) {
if (!this.timedRange_) {
this.processLog_([line]);
return;
}
if (line.startsWith("current-time")) {
if (this.hasSeenTimerMarker_) {
this.processLog_(this.logLinesSinceLastTimerMarker_);
this.logLinesSinceLastTimerMarker_ = [];
} else {
this.hasSeenTimerMarker_ = true;
}
} else {
if (this.hasSeenTimerMarker_) {
this.logLinesSinceLastTimerMarker_.push(line);
} else if (!line.startsWith("tick")) {
this.processLog_([line]);
}
}
};
/**
* Processes stack record.
*
* @param {number} pc Program counter.
* @param {number} func JS Function.
* @param {Array.<string>} stack String representation of a stack.
* @return {Array.<number>} Processed stack.
*/
LogReader.prototype.processStack = function(pc, func, stack) {
var fullStack = func ? [pc, func] : [pc];
var prevFrame = pc;
for (var i = 0, n = stack.length; i < n; ++i) {
var frame = stack[i];
var firstChar = frame.charAt(0);
if (firstChar == '+' || firstChar == '-') {
// An offset from the previous frame.
prevFrame += parseInt(frame, 16);
fullStack.push(prevFrame);
// Filter out possible 'overflow' string.
} else if (firstChar != 'o') {
fullStack.push(parseInt(frame, 16));
} else {
print("dropping: " + frame);
}
}
return fullStack;
};
/**
* Returns whether a particular dispatch must be skipped.
*
* @param {!Object} dispatch Dispatch record.
* @return {boolean} True if dispatch must be skipped.
*/
LogReader.prototype.skipDispatch = function(dispatch) {
return false;
};
/**
* Does a dispatch of a log record.
*
* @param {Array.<string>} fields Log record.
* @private
*/
LogReader.prototype.dispatchLogRow_ = function(fields) {
// Obtain the dispatch.
var command = fields[0];
if (!(command in this.dispatchTable_)) return;
var dispatch = this.dispatchTable_[command];
if (dispatch === null || this.skipDispatch(dispatch)) {
return;
}
// Parse fields.
var parsedFields = [];
for (var i = 0; i < dispatch.parsers.length; ++i) {
var parser = dispatch.parsers[i];
if (parser === null) {
parsedFields.push(fields[1 + i]);
} else if (typeof parser == 'function') {
parsedFields.push(parser(fields[1 + i]));
} else {
// var-args
parsedFields.push(fields.slice(1 + i));
break;
}
}
// Run the processor.
dispatch.processor.apply(this, parsedFields);
};
/**
* Processes log lines.
*
* @param {Array.<string>} lines Log lines.
* @private
*/
LogReader.prototype.processLog_ = function(lines) {
for (var i = 0, n = lines.length; i < n; ++i, ++this.lineNum_) {
var line = lines[i];
if (!line) {
continue;
}
try {
var fields = this.csvParser_.parseLine(line);
this.dispatchLogRow_(fields);
} catch (e) {
this.printError('line ' + (this.lineNum_ + 1) + ': ' + (e.message || e));
}
}
};