statics-fastpath-legacy.js

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// |jit-test| --fast-warmup; --enable-legacy-regexp

// A RegExp without legacy features invalidates the statics without updating

// them, so the next execution with the same input and source must restore them.

class MyRegExp extends RegExp {}

const str = "xa(b)c abc";

const plain = /a(b)c/;

const subclassed = new MyRegExp("a(b)c");

for (let i = 0; i < 200; i++) {

  assertEq(plain.test(str), true);

  assertEq(RegExp.$1, "b");

  assertEq(RegExp.leftContext, "xa(b)c ");

  assertEq(subclassed.test(str), true);

  let threw = false;

  try {

    RegExp.$1;

  } catch (e) {

    threw = e instanceof TypeError;

  assertEq(threw, true);

  assertEq(plain.test(str), true);

  assertEq(RegExp.$1, "b");

  assertEq(RegExp.lastMatch, "abc");