Profiler tick processor: exploit d8's readline to avoid reading

tools/tickprocessor.js

 // 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
@@ skipping 244 matching lines @@
 };
 
 
 TickProcessor.prototype.isJsCode = function(name) {
   return !(name in this.codeTypes_);
 };
 
 
 TickProcessor.prototype.processLogFile = function(fileName) {
   this.lastLogFileName_ = fileName;
-  var contents = readFile(fileName);
-  this.processLogChunk(contents);
+  var line;
+  while (line = readline()) {
+    this.processLogLine(line);
+  }
 };
 
 
 TickProcessor.prototype.processSharedLibrary = function(
     name, startAddr, endAddr) {
   var entry = this.profile_.addLibrary(name, startAddr, endAddr);
   this.setCodeType(entry.getName(), 'SHARED_LIB');
 
   var self = this;
   var libFuncs = this.cppEntriesProvider_.parseVmSymbols(
@@ skipping 566 matching lines @@
       if (arg !== synArg && dispatch === this.argsDispatch_[synArg]) {
         synonims.push(synArg);
         delete this.argsDispatch_[synArg];
       }
     }
     print('  ' + padRight(synonims.join(', '), 20) + dispatch[2]);
   }
   quit(2);
 };