v8/test/mjsunit/object-literal-overwrite.js

// Copyright 2010 the V8 project authors. All rights reserved.
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// modification, are permitted provided that the following conditions are
// met:
//
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

// Flags: --allow-natives-syntax

// Check that constants and computed properties are overwriting each other
// correctly, i.e., the last initializer for any name is stored in the object.


// Tests for the full code generator (if active).

var foo1 = {bar: 6, bar: 7};

var foo2 = {bar: function(a) {}, bar: 7};

var foo3 = {bar: function(a) {}, bar: function(b) {}, bar: 7};

var foo4 = {
  bar: function(b) {},
  bar: 4,
  bar: function() {
    return 7;
  }
};

var foo5 = {13: function(a) {}, 13: 7};

var foo6 = {14.31: function(a) {}, 14.31: 7};

var foo7 = {15: 6, 15: 7};

function foo8(i) {
  var obj = {x: {a: i}, x: 7};

  return obj.x;
};
%PrepareFunctionForOptimization(foo8);
;
assertEquals(7, foo1.bar);
assertEquals(7, foo2.bar);
assertEquals(7, foo3.bar);
assertEquals(7, foo4.bar());
assertEquals(7, foo5[13]);
assertEquals(7, foo6[14.31]);
assertEquals(7, foo7[15]);

assertEquals(7, foo8(1));
assertEquals(7, foo8(1));
%OptimizeFunctionOnNextCall(foo8);
assertEquals(7, foo8(1));


// Test for the classic code generator.

function fun(x) {
  var inner = {
    j: function(x) {
      return x;
    },
    j: 7
  };
  return inner.j;
}

assertEquals(7, fun(7));

// Check that the initializers of computed properties are executed, even if
// no store instructions are generated for the literals.

var glob1 = 0;

var bar1 = {x: glob1++, x: glob1++, x: glob1++, x: 7};

assertEquals(3, glob1);


var glob2 = 0;

function fun2() {
  var r = {y: glob2++, y: glob2++, y: glob2++, y: 7};
  return r.y;
}

var y = fun2();
assertEquals(7, y);
assertEquals(3, glob2);

var glob3 = 0;

function fun3() {
  var r = {113: glob3++, 113: glob3++, 113: glob3++, 113: 7};
  return r[113];
}

var y = fun3();
assertEquals(7, y);
assertEquals(3, glob3);