Correct handling of arrays with callbacks in the prototype chain.

test/mjsunit/setters-on-elements.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 --max-opt-count=100 --noalways-opt
+
+// We specify max-opt-count because we opt/deopt the same function many
+// times.
+
+// It's nice to run this in other browsers too.
+var standalone = false;
+if (standalone) {
+  assertTrue = function(val) {
+    if (val != true) {
+      print("FAILURE");
+    }
+  }
+
+  assertFalse = function(val) {
+    if (val != false) {
+      print("FAILURE");
+    }
+  }
+
+  assertEquals = function(expected, val) {
+    if (expected !== val) {
+      print("FAILURE");
+    }
+  }
+
+  empty_func = function(name) { }
+  assertUnoptimized = empty_func;
+  assertOptimized = empty_func;
+
+  optimize = empty_func;
+  clearFunctionTypeFeedback = empty_func;
+  deoptimizeFunction = empty_func;
+} else {
+  optimize = function(name) {
+    %OptimizeFunctionOnNextCall(name);
+  }
+  clearFunctionTypeFeedback = function(name) {
+    %ClearFunctionTypeFeedback(name);
+  }
+  deoptimizeFunction = function(name) {
+    %DeoptimizeFunction(name);
+  }
+}
+
+function base_setter_test(create_func, index, store_value) {
+  var calls = 0;
+
+  // Testcase: setter in prototype chain
+  foo = function(a) { a[index] = store_value; }
+  var a = create_func();
+  var ap = [];
+  ap.__defineSetter__(index, function() { calls++; });
+
+  foo(a);
+  foo(a);
+  foo(a);
+  delete a[index];
+
+  assertEquals(0, calls);
+  a.__proto__ = ap;
+  foo(a);
+  assertEquals(1, calls);
+  optimize(foo);
+  foo(a);
+  assertEquals(2, calls);
+  assertOptimized(foo);
+
+  // Testcase: setter "deep" in prototype chain.
+  clearFunctionTypeFeedback(foo);
+  deoptimizeFunction(foo);
+  clearFunctionTypeFeedback(foo);
+  calls = 0;
+
+  a = create_func();
+  var ap2 = [];
+  a.__proto__ = ap2;
+  foo(a);
+  foo(a);
+  foo(a);
+  delete a[index];
+
+  assertEquals(0, calls);
+
+  ap2.__proto__ = ap;  // "sneak" in a callback.
+  // The sneak case should be caught by unoptimized code too.
+  assertUnoptimized(foo);
+  foo(a);
+  foo(a);
+  foo(a);
+  assertEquals(3, calls);
+
+  // Testcase: setter added after optimization (feedback is monomorphic)
+  clearFunctionTypeFeedback(foo);
+  deoptimizeFunction(foo);
+  clearFunctionTypeFeedback(foo);
+  calls = 0;
+
+  a = create_func();
+  ap2 = [];
+  a.__proto__ = ap2;
+  foo(a);
+  foo(a);
+  foo(a);
+  optimize(foo);
+  foo(a);
+  assertOptimized(foo);
+  delete a[index];
+  ap2.__proto__ = ap;
+  foo(a);
+  assertUnoptimized(foo);  // map shape change should deopt foo.
+  assertEquals(1, calls);
+
+  // Testcase: adding additional setters to a prototype chain that already has
+  // one shouldn't deopt anything. (ie, we aren't changing the map shape).
+  clearFunctionTypeFeedback(foo);
+  calls = 0;
+
+  a = create_func();
+  a.__proto__ = ap2;
+  bar = function(a) { a[index+1] = store_value; }
+  bar(a);
+  bar(a);
+  bar(a);  // store should be generic
+  optimize(bar);
+  bar(a);
+  assertOptimized(bar);
+  assertEquals(0, calls);
+  delete a[index+1];
+  ap2.__defineSetter__(index+1, function() { calls++; });
+  bar(a);
+  assertOptimized(bar);
+  assertEquals(1, calls);
+}
+
+// Verify that map transitions don't confuse us.
+create_func_smi = function() { return [,,,,,,5]; }
+create_func_double = function() { return [0,,3.2,,,,5.5]; }
+create_func_fast = function() { return [,,,,,,true]; }
+create_func_dictionary = function() { var a = []; a.length = 100000; return a; }
+
+var cf = [create_func_smi,
+          create_func_double,
+          create_func_fast,
+          create_func_dictionary];
+
+var values = [3, 3.5, true];
+
+for(var c = 0; c < 3; c++) {
+  for(var s = 0; s < 3; s++) {
+    base_setter_test(cf[c], 0, values[s]);
+    base_setter_test(cf[c], 1, values[s]);
+  }
+}