regexp-2.js - mozsearch

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// Tests for IsRegExpPrototypeOptimizable and IsOptimizableRegExpObject intrinsics.

function test() {

  const IsRegExpPrototypeOptimizable = getSelfHostedValue("IsRegExpPrototypeOptimizable");

  const IsOptimizableRegExpObject = getSelfHostedValue("IsOptimizableRegExpObject");

  for (var i = 0; i < 20; i++) {

    assertEq(IsRegExpPrototypeOptimizable(), true);

    assertEq(IsOptimizableRegExpObject(/a/), true);

    assertEq(IsOptimizableRegExpObject({}), false);

    // Proto is not RegExp.prototype.

    var re1 = /abc/;

    assertEq(IsOptimizableRegExpObject(re1), true);

    Object.setPrototypeOf(re1, Object.create(RegExp.prototype));

    assertEq(IsOptimizableRegExpObject(re1), false);

    // Own "flags" property.

    var re2 = /abc.*def/;

    assertEq(IsOptimizableRegExpObject(re2), true);

    Object.defineProperty(re2, "flags", {value: ""});

    assertEq(IsOptimizableRegExpObject(re2), false);

    // Other own properties.

    var re3 = /.+/gi;

    assertEq(IsOptimizableRegExpObject(re3), true);

    re3.foobar = 1;

    assertEq(IsOptimizableRegExpObject(re3), false);

  for (var i = 0; i < 20; i++) {

    if (i === 13) {

      // This pops the fuse!

      RegExp.prototype.exec = function() {};

    assertEq(IsRegExpPrototypeOptimizable(), i < 13);

    assertEq(IsOptimizableRegExpObject(/abc.*/), i < 13);

    var re = /abc/;

    Object.setPrototypeOf(re, Object.create(RegExp.prototype));

    assertEq(IsOptimizableRegExpObject(re), false);

test();