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Diffstat (limited to 'src/3rdparty/v8/tools/logreader.js')
-rw-r--r-- | src/3rdparty/v8/tools/logreader.js | 185 |
1 files changed, 185 insertions, 0 deletions
diff --git a/src/3rdparty/v8/tools/logreader.js b/src/3rdparty/v8/tools/logreader.js new file mode 100644 index 0000000..315e721 --- /dev/null +++ b/src/3rdparty/v8/tools/logreader.js @@ -0,0 +1,185 @@ +// Copyright 2009 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. + * @constructor + */ +function LogReader(dispatchTable) { + /** + * @type {Array.<Object>} + */ + this.dispatchTable_ = dispatchTable; + + /** + * Current line. + * @type {number} + */ + this.lineNum_ = 0; + + /** + * CSV lines parser. + * @type {CsvParser} + */ + this.csvParser_ = new CsvParser(); +}; + + +/** + * 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) { + 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)); + } + } + 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_)) { + throw new Error('unknown command: ' + command); + } + 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)); + } + } +}; |