Track field types.

test/mjsunit/field-type-tracking.js

+// Copyright 2014 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 --nostress-opt --track-field-types
+
+(function() {
+  function A() {
+    this.a = "A";
+  }
+  function readA(x) {
+    return x.a;
+  }
+  var a = new A();
+  assertUnoptimized(readA);
+  readA(a); readA(a); readA(a);
+  %OptimizeFunctionOnNextCall(readA);
+  assertEquals(readA(a), "A");
+  assertOptimized(readA);
+
+  var b = new A();
+  b.b = "B";
+  assertEquals(readA(b), "A");
+  assertUnoptimized(readA);
+  %OptimizeFunctionOnNextCall(readA);
+  assertEquals(readA(a), "A");
+  assertOptimized(readA);
+  assertEquals(readA(a), "A");
+  assertEquals(readA(b), "A");
+  assertOptimized(readA);
+
+  function readAFromB(x) {
+    return x.a;
+  }
+  assertUnoptimized(readAFromB);
+  readAFromB(b); readAFromB(b); readAFromB(b);
+  %OptimizeFunctionOnNextCall(readAFromB);
+  assertEquals(readAFromB(b), "A");
+  assertOptimized(readAFromB);
+
+  var c = new A();
+  c.c = "C";
+  assertOptimized(readA);
+  assertOptimized(readAFromB);
+  c.a = [1];
+  assertUnoptimized(readA);
+  assertUnoptimized(readAFromB);
+  assertEquals(readA(a), "A");
+  assertEquals(readA(b), "A");
+  assertEquals(readA(c), [1]);
+  assertEquals(readAFromB(b), "A");
+
+  %OptimizeFunctionOnNextCall(readA);
+  assertEquals(readA(a), "A");
+  %OptimizeFunctionOnNextCall(readAFromB);
+  assertEquals(readAFromB(b), "A");
+  assertOptimized(readA);
+  a.a = [1];
+  assertEquals(readA(a), [1]);
+  assertEquals(readA(b), "A");
+  assertEquals(readA(c), [1]);
+  assertOptimized(readA);
+  b.a = [1];
+  assertEquals(readA(a), [1]);
+  assertEquals(readA(b), [1]);
+  assertEquals(readA(c), [1]);
+  assertOptimized(readA);
+  assertOptimized(readAFromB);
+})();
+
+(function() {
+  function A() { this.x = 0; }
+  A.prototype = {y: 20};
+  function B(o) { return o.a.y; }
+  function C() { this.a = new A(); }
+
+  B(new C());
+  B(new C());
+  %OptimizeFunctionOnNextCall(B);
+  var c = new C();
+  assertEquals(20, B(c));
+  assertOptimized(B);
+  c.a.y = 10;
+  assertEquals(10, B(c));
+  assertUnoptimized(B);
+
+  var c = new C();
+  %OptimizeFunctionOnNextCall(B);
+  assertEquals(20, B(c));
+  assertOptimized(B);
+  c.a.y = 30;
+  assertEquals(30, B(c));
+  assertOptimized(B);
+})();