v8/test/mjsunit/array-store-and-grow.js

// Copyright 2012 the V8 project authors. All rights reserved.
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// Flags: --allow-natives-syntax --opt --no-always-opt

// Verifies that the KeyedStoreIC correctly handles out-of-bounds stores
// to an array that grow it by a single element. Test functions are
// called twice to make sure that the IC is used, first call is handled
// by the runtime in the miss stub.

function array_store_1(a,b,c) {
  return (a[b] = c);
}

// Check handling of the empty array.
var a = [];
array_store_1(a, 0, 1);
a = [];
array_store_1(a, 0, 1);
assertEquals(1, a[0]);
assertEquals(1, array_store_1([], 0, 1));

a = [];
for (x=0;x<100000;++x) {
  assertEquals(x, array_store_1(a, x, x));
}

for (x=0;x<100000;++x) {
  assertEquals(x, array_store_1([], 0, x));
}

function array_store_2(a,b,c) {
  return (a[b] = c);
}

a = [];
array_store_2(a, 0, 0.5);
a = [];
array_store_2(a, 0, 0.5);
assertEquals(0.5, a[0]);
assertEquals(0.5, array_store_2([], 0, 0.5));

function array_store_3(a,b,c) {
  return (a[b] = c);
}

x = new Object();
a = [];
array_store_3(a, 0, x);
a = [];
array_store_3(a, 0, x);
assertEquals(x, a[0]);
assertEquals(x, array_store_3([], 0, x));

// Check the handling of COW arrays
function makeCOW() {
  return [1];
}

function array_store_4(a,b,c) {
  return (a[b] = c);
}

a = makeCOW();
array_store_4(a, 1, 1);
a = makeCOW();
array_store_4(a, 1, 1);
assertEquals(1, a[1]);
assertEquals(1, array_store_4([], 1, 1));

function array_store_5(a,b,c) {
  return (a[b] = c);
}

a = makeCOW();
array_store_5(a, 1, 0.5);
a = makeCOW();
array_store_5(a, 1, 0.5);
assertEquals(0.5, a[1]);
a = [];
assertEquals(0.5, array_store_5(a, 1, 0.5));
assertEquals(undefined, a[0]);
assertEquals(0.5, a[1]);

function array_store_6(a,b,c) {
  return (a[b] = c);
}

a = makeCOW();
array_store_6(a, 1, x);
a = makeCOW();
array_store_6(a, 1, x);
assertEquals(x, a[1]);
assertEquals(x, array_store_6([], 1, x));

// Check the handling of mutable arrays.
a = new Array(1,2,3);
array_store_4(a, 3, 1);
a = new Array(1,2,3);
array_store_4(a, 3, 1);
assertEquals(1, a[3]);
assertEquals(1, array_store_4([], 3, 1));

function array_store_5(a,b,c) {
  return (a[b] = c);
}

a = new Array(1,2,3);
array_store_5(a, 3, 0.5);
a = new Array(1,2,3);
array_store_5(a, 3, 0.5);
assertEquals(0.5, a[3]);
assertEquals(0.5, array_store_5([], 3, 0.5));

function array_store_6(a,b,c) {
  return (a[b] = c);
}

a = new Array(1,2,3);
array_store_6(a, 3, x);
a = new Array(1,2,3);
array_store_6(a, 3, x);
assertEquals(x, a[3]);
assertEquals(x, array_store_6([], 3, x));

function array_store_7(a,b,c) {
  return (a[b] = c);
}

// Check the handling of mutable arrays of doubles
var a = new Array(0.5, 1.5);
array_store_7(a, 2, .5);
a = new Array(0.5, 1.5);
array_store_7(a, 2, .5);
assertEquals(0.5, a[2]);
a = new Array(0.5, 1.5);
assertEquals(0.5, array_store_7(a, 2, 0.5));

for (x=0;x<100000;++x) {
  a = new Array(0.5, 1.5);
  assertEquals(x, array_store_7(a, 2, x));
}

function array_store_8(a,b,c) {
  return (a[b] = c);
}

var a = new Array(0.5, 1.5);
array_store_8(a, 2, .5);
a = new Array(0.5, 1.5);
array_store_8(a, 10, .5);
assertEquals(0.5, a[10]);

// Grow the empty array with a double store.
function array_store_9(a,b,c) {
  return (a[b] = c);
}

var a = [];
array_store_9(a, 0, 0.5);
a = [];
array_store_1(a, 0, 0.5);
assertEquals(0.5, a[0]);
assertEquals(0.5, array_store_1([], 0, 0.5));


// Verify that a grow store will deoptimize if the max gap (difference between
// the end of an array capacity and a new index) is passed. The wrapper is to
// make sure array_store_10 isn't inlined.

(function() {
  function grow_store(a,b,c) {
    a[b] = c;
  }

  a = new Array(1);
  grow_store(a,1,1);
  grow_store(a,2,1);
  %OptimizeFunctionOnNextCall(grow_store);
  grow_store(a,10,1);
  assertOptimized(grow_store);
  grow_store(a,2048,1);
  assertUnoptimized(grow_store);
  %ClearFunctionFeedback(grow_store);
})();


// Verify that a polymorphic store and grow IC when crankshafted is still
// a grow IC (earlier it would revert to a standard store in the polymorphic
// case).
(function() {
  function f(o, k, v) {
    o[k] = v;
  }

  a = [3.5];
  f(a, 1, "hi");  // DOUBLE packed array -> tagged packed grow
  a = {};
  a.p = "property";
  a[0] = 1;
  f(a, 0, 5.4);

  %OptimizeFunctionOnNextCall(f);
  // Should be a polymorphic grow stub. If not a grow stub it will deopt.
  f(new Array("hi"), 1, 3);
  assertOptimized(f);
  %ClearFunctionFeedback(f);
})();


// Now verify that a polymorphic store (non-growing) IC when crankshafted WILL
// deopt if you pass an element out of bounds.
(function() {
  function f(o, k, v) {
    o[k] = v;
  }

  a = [3.5];
  f(a, 0, "hi");  // DOUBLE packed array -> tagged packed grow
  a = {};
  a.p = "property";
  a[0] = 1;
  f(a, 0, 5.4);

  %OptimizeFunctionOnNextCall(f);
  f(new Array("hi"), 0, 3);
  assertOptimized(f);
  // An attempt to grow should cause deopt
  f(new Array("hi"), 1, 3);
  assertUnoptimized(f);
  %ClearFunctionFeedback(f);
})();