constructor-regexp.js

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var BUGNUMBER = 1130860;

var summary = "RegExp constructor shouldn't invoke source/flags getters on argument RegExp instance.";

print(BUGNUMBER + ": " + summary);

// same-compartment

var a = /foo/;

var flagsCalled = false;

var sourceCalled = false;

Object.defineProperty(a, "source", { get: () => {

  sourceCalled = true;

  return "bar";

}});

Object.defineProperty(a, "flags", { get: () => {

  flagsCalled = true;

  return "i";

}});

assertEq(a.source, "bar");

assertEq(a.flags, "i");

assertEq(sourceCalled, true);

assertEq(flagsCalled, true);

sourceCalled = false;

flagsCalled = false;

assertEq(new RegExp(a).source, "foo");

assertEq(sourceCalled, false);

assertEq(flagsCalled, false);

// cross-compartment

var g = newGlobal();

var b = g.eval(`

var b = /foo2/;

var flagsCalled = false;

var sourceCalled = false;

Object.defineProperty(b, "source", { get: () => {

  sourceCalled = true;

  return "bar2";

}});

Object.defineProperty(b, "flags", { get: () => {

  flagsCalled = true;

  return "i";

}});

b;

`);

assertEq(b.source, "bar2");

assertEq(b.flags, "i");

assertEq(g.eval("sourceCalled;"), true);

assertEq(g.eval("flagsCalled;"), true);

g.eval(`

sourceCalled = false;

flagsCalled = false;

`);

assertEq(new RegExp(b).source, "foo2");

assertEq(g.eval("sourceCalled;"), false);

assertEq(g.eval("flagsCalled;"), false);

if (typeof reportCompare === "function")

    reportCompare(true, true);