Generate specialized constructor code for constructing simple objects

test/mjsunit/simple-constructor.js

 // Copyright 2008 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
@@ skipping 35 matching lines @@
 }
 
 function f4(x) {
   this.x = x;
   this.y = 1;
   if (x == 1) return;
   this.z = f1;
 }
 
 o1_1 = new f1();
+assertEquals(1, o1_1.x, "1");
 o1_2 = new f1();
-assertArrayEquals(["x"], props(o1_1));
-assertArrayEquals(["x"], props(o1_2));
+assertEquals(1, o1_1.x, "2");
+assertArrayEquals(["x"], props(o1_1), "3");
+assertArrayEquals(["x"], props(o1_2), "4");
 
 o2_1 = new f2(0);
 o2_2 = new f2(0);
 assertArrayEquals(["x"], props(o2_1));
 assertArrayEquals(["x"], props(o2_2));
 
 o3_1 = new f3(0);
 o3_2 = new f3(0);
 assertArrayEquals(["x", "y", "z"], props(o3_1));
 assertArrayEquals(["x", "y", "z"], props(o3_2));
 
 o4_0_1 = new f4(0);
 o4_0_2 = new f4(0);
 assertArrayEquals(["x", "y", "z"], props(o4_0_1));
 assertArrayEquals(["x", "y", "z"], props(o4_0_2));
 
 o4_1_1 = new f4(1);
 o4_1_2 = new f4(1);
 assertArrayEquals(["x", "y"], props(o4_1_1));
 assertArrayEquals(["x", "y"], props(o4_1_2));
+
+function f5(x, y) {
+  this.x = x;
+  this.y = y;
+}
+
+function f6(x, y) {
+  this.y = y;
+  this.x = x;
+}
+
+function f7(x, y, z) {
+  this.x = x;
+  this.y = y;
+}
+
+function testArgs(fun) {
+  obj = new fun();
+  assertArrayEquals(["x", "y"], props(obj));
+  assertEquals(void 0, obj.x);
+  assertEquals(void 0, obj.y);
+
+  obj = new fun("x");
+  assertArrayEquals(["x", "y"], props(obj));
+  assertEquals("x", obj.x);
+  assertEquals(void 0, obj.y);
+
+  obj = new fun("x", "y");
+  assertArrayEquals(["x", "y"], props(obj));
+  assertEquals("x", obj.x);
+  assertEquals("y", obj.y);
+
+  obj = new fun("x", "y", "z");
+  assertArrayEquals(["x", "y"], props(obj));
+  assertEquals("x", obj.x);
+  assertEquals("y", obj.y);
+}
+
+for (var i = 0; i < 10; i++) {
+  testArgs(f5);
+  testArgs(f6);
+  testArgs(f7);
+}