Implement inlined object allocation in Crankshaft.

test/mjsunit/compiler/alloc-object.js

Index: test/mjsunit/compiler/alloc-object.js
diff --git a/test/mjsunit/compiler/alloc-object.js b/test/mjsunit/compiler/alloc-object.js
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+// Copyright 2012 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 --expose-gc --inline-construct
+
+// Test that inlined object allocation works for different layouts of
+// objects (e.g. in object properties, slack tracking in progress or
+// changing of function prototypes)
+
+function test_helper(construct, a, b) {
+  return new construct(a, b);
+}
+
+function test(construct) {
+  %DeoptimizeFunction(test);
+  test_helper(construct, 0, 0);
+  test_helper(construct, 0, 0);
+  %OptimizeFunctionOnNextCall(test_helper);
+  // Test adding a new property after allocation was inlined.
+  var o = test_helper(construct, 1, 2);
+  o.z = 3;
+  assertEquals(1, o.x);
+  assertEquals(2, o.y);
+  assertEquals(3, o.z);
+  // Test changing the prototype after allocation was inlined.
+  construct.prototype = { z:6 };
+  var o = test_helper(construct, 4, 5);
+  assertEquals(4, o.x);
+  assertEquals(5, o.y);
+  assertEquals(6, o.z);
+  %DeoptimizeFunction(test_helper);
+  gc();  // Makes V8 forget about type information for test_helper.
+}
+
+function finalize_slack_tracking(construct) {
+  // Value chosen based on kGenerousAllocationCount = 8.
+  for (var i = 0; i < 8; i++) {
+    new construct(0, 0);
+  }
+}
+
+
+// Both properties are pre-allocated in object properties.
+function ConstructInObjectPreAllocated(a, b) {
+  this.x = a;
+  this.y = b;
+}
+finalize_slack_tracking(ConstructInObjectPreAllocated);
+test(ConstructInObjectPreAllocated);
+
+
+// Both properties are unused in object properties.
+function ConstructInObjectUnused(a, b) {
+  this.x = a < 0 ? 0 : a;
+  this.y = b > 0 ? b : 0;
+}
+finalize_slack_tracking(ConstructInObjectUnused);
+test(ConstructInObjectUnused);
+
+
+// Test inlined allocation while slack tracking is still in progress.
+function ConstructWhileSlackTracking(a, b) {
+  this.x = a;
+  this.y = b;
+}
+test(ConstructWhileSlackTracking);