test/mjsunit/regress/setter.js

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function s(v) {
  v.x = 1;
}

function c(p) {
  return {__proto__: p};
}

var p = {};

var o1 = c(p);
var o2 = c(p);
var o3 = c(p);
var o4 = c(p);
var o5 = c(p);

// Initialize the store IC.
s(o1);
s(o2);

// Install a setter on p.x
var count = 0;
Object.defineProperty(p, "x", {
  set: function(x) {
    count += 1;
  }
});

// Verify that the setter was called directly.
o3.x = 20;
assertEquals(1, count);

// Verify that monomorphic prototype failure is triggered in the IC.
s(o4);
assertEquals(2, count);

// Verify that the newly installed IC is correct.
s(o5);
assertEquals(3, count);