tuchida

function traverseFn(node, fn) {
  var parents = [];
  (function f(node) {
    fn(node, parents);
    parents.push(node);
    for (var c in Iterator(node)) {
      f(c);
    }
    parents.pop();
  })(node);

tuchida

function parse(str) {
  var ir = Packages.jdk.nashorn.internal.ir;
  var runtime = Packages.jdk.nashorn.internal.runtime;
  var parser = Packages.jdk.nashorn.internal.parser;

  var context = runtime.Context.getContext();
  var source = new runtime.Source('test', str);

  var node = new parser.Parser(context.getEnv(), source, new runtime.Context.ThrowErrorManager(), true).parse();
  var lexContext = new ir.LexicalContext();

tuchida

var express = require('express');
var app = express();

app.get('/', function(req, res) {
  res.type('text/html');
  res.send('<script>' +
             'new EventSource(\'/event/a\').addEventListener(\'message\',function(event) {' +
               'document.body.appendChild(document.createElement(\'div\')).textContent = event.data;' +
             '});' +
           '</script>');

tuchida

macro asmfn {
  case $name:ident ($params ...) { $body ... } => {
    function $name(asmfn_params($params ...)) {
      'use asm';
      asmfn_convparams($params ...)
      $body ...
    }
  }
 // case $name:ident ($params ...): $ret_type { $body ... } => {
 //      macro ret {

tuchida

var props = [
  "constructor",
  "toString",
  "toSource",
  "valueOf",
  "charAt",
  "charCodeAt",
  "indexOf",
  "lastIndexOf",
  "split",

tuchida

調査中なので推測や誤解があるものとして読んでください。

事象

Rhinoで 1=1 を評価すると ParserException が発生する

$ java -jar buildGradle/libs/rhino-1.7.14-SNAPSHOT.jar -version 200
Rhino 1.7.14-SNAPSHOT 2021 04 04
js> 1 = 1

tuchida

diff --git a/src/org/mozilla/javascript/optimizer/Codegen.java b/src/org/mozilla/javascript/optimizer/Codegen.java
index 7e518cc3..99901b1f 100644
--- a/src/org/mozilla/javascript/optimizer/Codegen.java
+++ b/src/org/mozilla/javascript/optimizer/Codegen.java
@@ -301,6 +301,11 @@ public class Codegen implements Evaluator {
         emitTemplateLiteralInit(cfw);
         emitConstantDudeInitializers(cfw);
 
+        try {
+            java.nio.file.Files.write(java.nio.file.Paths.get("try.class"), cfw.toByteArray());