[tools] Migrate more tools to ES6 classes

For simplicity this CL includes a first crude conversion of
tickprocessor.mjs. Later CLs will introduce more ES6 syntax and clean
up more code.

Bug: v8:10667
Change-Id: Ief2ca623f5562114fb976a95d156e2ab3f961114
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2611252Reviewed-by: Sathya Gunasekaran  <gsathya@chromium.org>
Commit-Queue: Camillo Bruni <cbruni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#72013}

tools/consarray.mjs

@@ -36,49 +36,47 @@
  *
  * @constructor
  */
-export function ConsArray() {
-  this.tail_ = new ConsArray.Cell(null, null);
-  this.currCell_ = this.tail_;
-  this.currCellPos_ = 0;
-};
-
-
-/**
- * Concatenates another array for iterating. Empty arrays are ignored.
- * This operation can be safely performed during ongoing ConsArray
- * iteration.
- *
- * @param {Array} arr Array to concatenate.
- */
-ConsArray.prototype.concat = function(arr) {
-  if (arr.length > 0) {
-    this.tail_.data = arr;
-    this.tail_ = this.tail_.next = new ConsArray.Cell(null, null);
+export class ConsArray {
+  constructor() {
+    this.tail_ = new ConsArrayCell(null, null);
+    this.currCell_ = this.tail_;
+    this.currCellPos_ = 0;
+  }
+  /**
+   * Concatenates another array for iterating. Empty arrays are ignored.
+   * This operation can be safely performed during ongoing ConsArray
+   * iteration.
+   *
+   * @param {Array} arr Array to concatenate.
+   */
+  concat(arr) {
+    if (arr.length > 0) {
+      this.tail_.data = arr;
+      this.tail_ = this.tail_.next = new ConsArrayCell(null, null);
+    }
   }
-};
-
-
-/**
- * Whether the end of iteration is reached.
- */
-ConsArray.prototype.atEnd = function() {
-  return this.currCell_ === null ||
-      this.currCell_.data === null ||
-      this.currCellPos_ >= this.currCell_.data.length;
-};
 
+  /**
+   * Whether the end of iteration is reached.
+   */
+  atEnd() {
+    return this.currCell_ === null ||
+        this.currCell_.data === null ||
+        this.currCellPos_ >= this.currCell_.data.length;
+  }
 
-/**
- * Returns the current item, moves to the next one.
- */
-ConsArray.prototype.next = function() {
-  const result = this.currCell_.data[this.currCellPos_++];
-  if (this.currCellPos_ >= this.currCell_.data.length) {
-    this.currCell_ = this.currCell_.next;
-    this.currCellPos_ = 0;
+  /**
+   * Returns the current item, moves to the next one.
+   */
+  next() {
+    const result = this.currCell_.data[this.currCellPos_++];
+    if (this.currCellPos_ >= this.currCell_.data.length) {
+      this.currCell_ = this.currCell_.next;
+      this.currCellPos_ = 0;
+    }
+    return result;
   }
-  return result;
-};
+}
 
 
 /**
@@ -86,7 +84,9 @@ ConsArray.prototype.next = function() {
  *
  * @constructor
  */
-ConsArray.Cell = function(data, next) {
-  this.data = data;
-  this.next = next;
-};
+class ConsArrayCell {
+  constructor(data, next) {
+    this.data = data;
+    this.next = next;
+  }
+}

tools/dumpcpp.mjs

@@ -5,10 +5,9 @@
 import { LogReader, parseString } from "./logreader.mjs";
 import { CodeMap, CodeEntry } from "./codemap.mjs";
 export {
-    ArgumentsProcessor, UnixCppEntriesProvider, 
+    ArgumentsProcessor, UnixCppEntriesProvider,
     WindowsCppEntriesProvider, MacCppEntriesProvider,
   } from  "./tickprocessor.mjs";
-  import { inherits } from  "./tickprocessor.mjs";
 
 
 export class CppProcessor extends LogReader {
@@ -29,7 +28,7 @@ export class CppProcessor extends LogReader {
    */
   printError(str) {
     print(str);
-  };
+  }
 
   processLogFile(fileName) {
     this.lastLogFileName_ = fileName;
@@ -37,14 +36,14 @@ export class CppProcessor extends LogReader {
     while (line = readline()) {
       this.processLogLine(line);
     }
-  };
+  }
 
   processLogFileInTest(fileName) {
     // Hack file name to avoid dealing with platform specifics.
     this.lastLogFileName_ = 'v8.log';
     const contents = readFile(fileName);
     this.processLogChunk(contents);
-  };
+  }
 
   processSharedLibrary(name, startAddr, endAddr, aslrSlide) {
     const self = this;
@@ -53,7 +52,7 @@ export class CppProcessor extends LogReader {
       const entry = new CodeEntry(fEnd - fStart, fName, 'CPP');
       self.codeMap_.addStaticCode(fStart, entry);
     });
-  };
+  }
 
   dumpCppSymbols() {
     const staticEntries = this.codeMap_.getAllStaticEntriesWithAddresses();