v8/test/mjsunit/regress/regress-convert-hole2.js

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// Flags: --allow-natives-syntax

// Test adding undefined from hole in double-holey to string.
var a = [1.5, , 1.8];

function f(a, i, l) {
  var v = a[i];
  return l + v;
}

assertEquals("test1.5", f(a, 0, "test"));
assertEquals("test1.5", f(a, 0, "test"));
%OptimizeFunctionOnNextCall(f);
assertEquals("testundefined", f(a, 1, "test"));

// Test double-hole going through a phi to a string-add.
function f2(b, a1, a2) {
  var v;
  if (b) {
    v = a1[0];
  } else {
    v = a2[0];
  }
  x = v * 2;
  return "test" + v + x;
}

f2(true, [1.4,1.8,,1.9], [1.4,1.8,,1.9]);
f2(true, [1.4,1.8,,1.9], [1.4,1.8,,1.9]);
f2(false, [1.4,1.8,,1.9], [1.4,1.8,,1.9]);
f2(false, [1.4,1.8,,1.9], [1.4,1.8,,1.9]);
%OptimizeFunctionOnNextCall(f2);
assertEquals("testundefinedNaN", f2(false, [,1.8,,1.9], [,1.9,,1.9]));

// Test converting smi-hole to double-hole.
function t_smi(a) {
  a[0] = 1.5;
}

t_smi([1,,3]);
t_smi([1,,3]);
t_smi([1,,3]);
%OptimizeFunctionOnNextCall(t_smi);
var ta = [1,,3];
t_smi(ta);
ta.__proto__ = [6,6,6];
assertEquals([1.5,6,3], ta);

// Test converting double-hole to tagged-hole.
function t(b) {
  b[1] = {};
}

t([1.4, 1.6,,1.8, NaN]);
t([1.4, 1.6,,1.8, NaN]);
%OptimizeFunctionOnNextCall(t);
var a = [1.6, 1.8,,1.9, NaN];
t(a);
a.__proto__ = [6,6,6,6,6];
assertEquals([1.6, {}, 6, 1.9, NaN], a);