repo_description: Node.js JavaScript runtime ✨🐢🚀✨
repo_topics: javascript js linux macos mit node nodejs runtime windows
code: // Copyright 2012 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.
  
  'use strict';
  
  /* eslint-disable node-core/prefer-primordials, no-restricted-globals */
  /* global console */
  
  const {
    ArrayPrototypePush,
    ArrayPrototypePushApply,
    ArrayPrototypeSlice,
  } = primordials;
  
  const fs = require('fs');
  const cp = require('child_process');
  const { Buffer } = require('buffer');
  const { StringDecoder } = require('string_decoder');
  
  const os = {
    system: function(name, args) {
      if (process.platform === 'linux' && name === 'nm') {
        // Filter out vdso and vsyscall entries.
        const arg = args[args.length - 1];
        if (arg === '[vdso]' ||
            arg === '[vsyscall]' ||
            /^[0-9a-f]+-[0-9a-f]+$/.test(arg)) {
          return '';
        }
      }
      let out = cp.spawnSync(name, args).stdout.toString();
      // Auto c++filt names, but not [iItT]
      if (process.platform === 'darwin' && name === 'nm') {
        // `nm` prints an error along the lines of "Run xcodebuild -license" and
        // exits when Xcode hasn't been properly installed or when its license
        // hasn't been accepted yet. Basically any mention of xcodebuild in
        // the output means the nm command is non-functional.
        const match = out.match(/(?:^|\n)([^\n]*xcodebuild[^\n]*)(?:\n|$)/);
        // eslint-disable-next-line no-restricted-syntax
        if (match) throw new Error(match[1]);
        out = macCppfiltNm(out);
      }
      return out;
    },
  };
  const print = console.log;
  
  function read(fileName) {
    return fs.readFileSync(fileName, 'utf8');
  }
  const quit = process.exit;
  
  const tickArguments = [];
  if (process.platform === 'darwin') {
    ArrayPrototypePush(tickArguments, '--mac');
  } else if (process.platform === 'win32') {
    ArrayPrototypePush(tickArguments, '--windows');
  }
  ArrayPrototypePushApply(tickArguments,
                          ArrayPrototypeSlice(process.argv, 1));
  
  function write(str) { process.stdout.write(str); };
  function printErr(str) { process.stderr.write(str); };
  
  let logFile;
  let fd;
  const buf = Buffer.allocUnsafe(4096);
  const dec = new StringDecoder('utf-8');
  let line = '';
  
  function openFile(filename) {
    logFile = filename;
    try {
      fd = fs.openSync(logFile, 'r');
    } catch (e) {
      console.error(`Cannot access log file: ${logFile}`);
      console.error('Please provide a valid isolate file as the final argument.');
      throw e;
    }
  
    const message = versionCheck(peekline(), process.versions.v8);
    if (message) console.log(message);
  }
  
  function peekline() {
    const s = readline();
    line = `${s}\n${line}`;
    return s;
  }
  
  function readline() {
    while (true) {
      const lineBreak = line.indexOf('\n');
      if (lineBreak !== -1) {
        const res = line.slice(0, lineBreak);
        line = line.slice(lineBreak + 1);
        return res;
      }
      const bytes = fs.readSync(fd, buf, 0, buf.length);
      line += dec.write(buf.slice(0, bytes));
      if (line.length === 0) {
        return '';
      }
      if (bytes === 0) {
        process.emitWarning(`Profile file ${logFile} is broken`, {
          code: 'BROKEN_PROFILE_FILE',
          detail: `${JSON.stringify(line)} at the file end is broken`,
        });
        return '';
      }
    }
  }
  
  function versionCheck(firstLine, expected) {
    // v8-version looks like
    // "v8-version,$major,$minor,$build,$patch[,$embedder],$candidate"
    // whereas process.versions.v8 is either "$major.$minor.$build-$embedder" or
    // "$major.$minor.$build.$patch-$embedder".
    firstLine = firstLine.split(',');
    const curVer = expected.split(/[.-]/);
    if ((firstLine.length !== 6 && firstLine.length !== 7) ||
        firstLine[0] !== 'v8-version') {
      return 'Unable to read v8-version from log file.';
    }
    // Compare major, minor and build; ignore the patch and candidate fields.
    for (let i = 0; i < 3; i++)
      if (curVer[i] !== firstLine[i + 1])
        return 'Testing v8 version different from logging version';
  }
  
  function macCppfiltNm(out) {
    // Re-grouped copy-paste from `tickprocessor.js`
    const FUNC_RE = /^([0-9a-fA-F]{8,16} [iItT] )(.*)$/gm;
    const CLEAN_RE = /^[0-9a-fA-F]{8,16} [iItT] /;
    let entries = out.match(FUNC_RE);
    if (entries === null)
      return out;
  
    entries = entries.map((entry) => entry.replace(CLEAN_RE, ''));
  
    let filtered;
    try {
      filtered = cp.spawnSync('c++filt', [ '-p', '-i' ], {
        input: entries.join('\n'),
      }).stdout.toString();
    } catch {
      return out;
    }
  
    let i = 0;
    filtered = filtered.split('\n');
    return out.replace(FUNC_RE, (all, prefix, postfix) => {
      return prefix + (filtered[i++] || postfix);
    });
  }
  
  module.exports = {
    globals: {
      arguments: tickArguments,
      write,
      printErr,
      os,
      print,
      read,
      quit,
      readline,
    },
    openFile,
    versionCheck,
  };
  