tools: single, cross-platform tick processor

Currently there are three separate tick processor scripts for
mac, windows, and linux. These have been replaced with a single
node.js script to improve maintainability and remove the need
to preserve parallel logic in these separate places.

PR-URL: #2868
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Sakthipriyan Vairamani <thechargingvolcano@gmail.com>

test/parallel/test-tick-processor.js

@@ -8,7 +8,7 @@ var common = require('../common');
 common.refreshTmpDir();
 process.chdir(common.tmpDir);
 var processor =
-    path.join(common.testDir, '..', 'tools', 'v8-prof', getScriptName());
+    path.join(common.testDir, '..', 'tools', 'v8-prof', 'tick-processor.js');
 // Unknown checked for to prevent flakiness, if pattern is not found,
 // then a large number of unknown ticks should be present
 runTest(/LazyCompile.*\[eval\]:1|.*%  UNKNOWN/,
@@ -43,19 +43,9 @@ function runTest(pattern, code) {
     assert.fail('There should be a single log file.');
   }
   var log = matches[0];
-  var out = cp.execSync(processor + ' --call-graph-size=10 ' + log,
+  var out = cp.execSync(process.execPath + ' ' + processor +
+                        ' --call-graph-size=10 ' + log,
                         {encoding: 'utf8'});
   assert(out.match(pattern));
   fs.unlinkSync(log);
 }
-
-function getScriptName() {
-  switch (process.platform) {
-    case 'darwin':
-      return 'mac-tick-processor';
-    case 'win32':
-      return 'windows-tick-processor.bat';
-    default:
-      return 'linux-tick-processor';
-  }
-}

tools/v8-prof/tick-processor.js

@@ -0,0 +1,51 @@
+'use strict';
+var cp = require('child_process');
+var fs = require('fs');
+var path = require('path');
+
+var toolsPath = path.join(__dirname, '..', '..', 'deps', 'v8', 'tools');
+var scriptFiles = [
+    path.join(__dirname, 'polyfill.js'),
+    path.join(toolsPath, 'splaytree.js'),
+    path.join(toolsPath, 'codemap.js'),
+    path.join(toolsPath, 'csvparser.js'),
+    path.join(toolsPath, 'consarray.js'),
+    path.join(toolsPath, 'csvparser.js'),
+    path.join(toolsPath, 'consarray.js'),
+    path.join(toolsPath, 'profile.js'),
+    path.join(toolsPath, 'profile_view.js'),
+    path.join(toolsPath, 'logreader.js'),
+    path.join(toolsPath, 'tickprocessor.js'),
+    path.join(toolsPath, 'SourceMap.js'),
+    path.join(toolsPath, 'tickprocessor-driver.js')];
+var tempScript = path.join(__dirname, 'tick-processor-tmp-' + process.pid);
+
+process.on('exit', function() {
+  try { fs.unlinkSync(tempScript); } catch (e) {}
+});
+process.on('uncaughtException', function(err) {
+  try { fs.unlinkSync(tempScript); } catch (e) {}
+  throw err;
+});
+
+var inStreams = scriptFiles.map(function(f) {
+  return fs.createReadStream(f);
+});
+var outStream = fs.createWriteStream(tempScript);
+inStreams.reduce(function(prev, curr, i) {
+  prev.on('end', function() {
+    curr.pipe(outStream, { end: i === inStreams.length - 1});
+  });
+  return curr;
+});
+inStreams[0].pipe(outStream, { end: false });
+outStream.on('close', function() {
+  var tickArguments = [tempScript];
+  if (process.platform === 'darwin') {
+    tickArguments.push('--mac', '--nm=' + path.join(toolsPath, 'mac-nm'));
+  } else if (process.platform === 'win32') {
+    tickArguments.push('--windows');
+  }
+  tickArguments.push.apply(tickArguments, process.argv.slice(2));
+  var processTicks = cp.spawn(process.execPath, tickArguments, { stdio: 'inherit' });
+});