test/mjsunit/track-fields.js

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// Flags: --track-fields --track-double-fields --allow-natives-syntax

// Test transitions caused by changes to field representations.

function create_smi_object() {
  var o = {};
  o.x = 1;
  o.y = 2;
  o.z = 3;
  return o;
}

var o1 = create_smi_object();
var o2 = create_smi_object();

// o1,o2 are smi, smi, smi
assertTrue(%HaveSameMap(o1, o2));
o1.y = 1.3;
// o1 is smi, double, smi
assertFalse(%HaveSameMap(o1, o2));
o2.y = 1.5;
// o2 is smi, double, smi
assertTrue(%HaveSameMap(o1, o2));

// o3 is initialized as smi, double, smi
var o3 = create_smi_object();
assertTrue(%HaveSameMap(o1, o3));

function set_large(o, v) {
  o.x01 = v; o.x02 = v; o.x03 = v; o.x04 = v; o.x05 = v; o.x06 = v; o.x07 = v;
  o.x08 = v; o.x09 = v; o.x10 = v; o.x11 = v; o.x12 = v; o.x13 = v; o.x14 = v;
  o.x15 = v; o.x16 = v; o.x17 = v; o.x18 = v; o.x19 = v; o.x20 = v; o.x21 = v;
  o.x22 = v; o.x23 = v; o.x24 = v; o.x25 = v; o.x26 = v; o.x27 = v; o.x28 = v;
  o.x29 = v; o.x30 = v; o.x31 = v; o.x32 = v; o.x33 = v; o.x34 = v; o.x35 = v;
  o.x36 = v; o.x37 = v; o.x38 = v; o.x39 = v; o.x40 = v; o.x41 = v; o.x42 = v;
  o.y01 = v; o.y02 = v; o.y03 = v; o.y04 = v; o.y05 = v; o.y06 = v; o.y07 = v;
  o.y08 = v; o.y09 = v; o.y10 = v; o.y11 = v; o.y12 = v; o.y13 = v; o.y14 = v;
  o.y15 = v; o.y16 = v; o.y17 = v; o.y18 = v; o.y19 = v; o.y20 = v; o.y21 = v;
}

// Check that large object migrations work.
var o4 = {};
// All smi.
set_large(o4, 0);
assertTrue(%HasFastProperties(o4));
// All double.
set_large(o4, 1.5);
// o5 is immediately allocated with doubles.
var o5 = {};
set_large(o5, 0);
assertTrue(%HaveSameMap(o4, o5));

function create_smi_object2() {
  var o = {};
  o.a = 1;
  o.b = 2;
  o.c = 3;
  return o;
}

// All smi
var o6 = create_smi_object2();
var o7 = create_smi_object2();

assertTrue(%HaveSameMap(o6, o7));
// Smi, double, smi.
o6.b = 1.5;
assertFalse(%HaveSameMap(o6, o7));
// Smi, double, object.
o7.c = {};
assertFalse(%HaveSameMap(o6, o7));
// Smi, double, object.
o6.c = {};
assertTrue(%HaveSameMap(o6, o7));