Support array literals with FAST_DOUBLE_ELEMENTS ElementsKind.

test/mjsunit/array-literal-transitions.js

+// Copyright 2011 the V8 project authors. All rights reserved.
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+//       notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+//       copyright notice, this list of conditions and the following
+//       disclaimer in the documentation and/or other materials provided
+//       with the distribution.
+//     * Neither the name of Google Inc. nor the names of its
+//       contributors may be used to endorse or promote products derived
+//       from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Flags: --allow-natives-syntax --smi-only-arrays --expose-gc
+// Test element kind of objects.
+// Since --smi-only-arrays affects builtins, its default setting at compile
+// time sticks if built with snapshot.  If --smi-only-arrays is deactivated
+// by default, only a no-snapshot build actually has smi-only arrays enabled
+// in this test case.  Depending on whether smi-only arrays are actually
+// enabled, this test takes the appropriate code path to check smi-only arrays.
+
+support_smi_only_arrays = %HasFastSmiOnlyElements(new Array());
+
+// IC and Crankshaft support for smi-only elements in dynamic array literals.
+function get(foo) { return foo; }  // Used to generate dynamic values.
+
+function array_literal_test() {
+  var a0 = [1, 2, 3];
+  assertTrue(%HasFastSmiOnlyElements(a0));
+  var a1 = [get(1), get(2), get(3)];
+  assertTrue(%HasFastSmiOnlyElements(a1));
+
+  var b0 = [1, 2, get("three")];
+  assertTrue(%HasFastElements(b0));
+  var b1 = [get(1), get(2), get("three")];
+  assertTrue(%HasFastElements(b1));
+
+  var c0 = [1, 2, get(3.5)];
+  assertTrue(%HasFastDoubleElements(c0));
+  assertEquals(3.5, c0[2]);
+  assertEquals(2, c0[1]);
+  assertEquals(1, c0[0]);
+
+  var c1 = [1, 2, 3.5];
+  assertTrue(%HasFastDoubleElements(c1));
+  assertEquals(3.5, c1[2]);
+  assertEquals(2, c1[1]);
+  assertEquals(1, c1[0]);
+
+  var c2 = [get(1), get(2), get(3.5)];
+  assertTrue(%HasFastDoubleElements(c2));
+  assertEquals(3.5, c2[2]);
+  assertEquals(2, c2[1]);
+  assertEquals(1, c2[0]);
+
+  var object = new Object();
+  var d0 = [1, 2, object];
+  assertTrue(%HasFastElements(d0));
+  assertEquals(object, d0[2]);
+  assertEquals(2, d0[1]);
+  assertEquals(1, d0[0]);
+
+  var e0 = [1, 2, 3.5];
+  assertTrue(%HasFastDoubleElements(e0));
+  assertEquals(3.5, e0[2]);
+  assertEquals(2, e0[1]);
+  assertEquals(1, e0[0]);
+
+  var f0 = [1, 2, [1, 2]];
+  assertTrue(%HasFastElements(f0));
+  assertEquals([1,2], f0[2]);
+  assertEquals(2, f0[1]);
+  assertEquals(1, f0[0]);
+}
+
+if (support_smi_only_arrays) {
+
+  for (var i = 0; i < 3; i++) {
+    array_literal_test();
+  }
+  %OptimizeFunctionOnNextCall(array_literal_test);
+  array_literal_test();
+
+  function test_large_literal() {
+
+    function d() {
+      gc();
+      return 2.5;
+    }
+
+    function o() {
+      gc();
+      return new Object();
+    }
+
+    large =
+        [ 0, 1, 2, 3, 4, 5, d(), d(), d(), d(), d(), d(), o(), o(), o(), o() ];
+    assertFalse(%HasDictionaryElements(large));
+    assertFalse(%HasFastSmiOnlyElements(large));
+    assertFalse(%HasFastDoubleElements(large));
+    assertTrue(%HasFastElements(large));
+    assertEquals(large,
+                 [0, 1, 2, 3, 4, 5, 2.5, 2.5, 2.5, 2.5, 2.5, 2.5,
+                  new Object(), new Object(), new Object(), new Object()]);
+  }
+
+  for (var i = 0; i < 3; i++) {
+    test_large_literal();
+  }
+  %OptimizeFunctionOnNextCall(test_large_literal);
+  test_large_literal();
+
+
+  function d() {

[Jakob Kummerow, 2011/10/18 15:42:36]

Isn't everything from here on down contained in test_large_literal() anyway?

[danno, 2011/10/19 11:36:39]

Done.

+    gc();
+    return 2.5;
+  }
+
+  function o() {
+    gc();
+    return new Object();
+  }
+
+  large =
+      [ 0, 1, 2, 3, 4, 5, d(), d(), d(), d(), d(), d(), o(), o(), o(), o() ];
+  assertFalse(%HasDictionaryElements(large));
+  assertFalse(%HasFastSmiOnlyElements(large));
+  assertFalse(%HasFastDoubleElements(large));
+  assertTrue(%HasFastElements(large));
+}