Deoptimization support for accessors.

test/mjsunit/compiler/inline-accessors.js

 // 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 --inline-accessors
+// Flags: --allow-natives-syntax --inline-accessors --max-opt-count=100
 
 var accessorCallCount, setterArgument, setterValue, obj, forceDeopt;
 
 // -----------------------------------------------------------------------------
 // Helpers for testing inlining of getters.
 
-function TestInlinedGetter(context, expected) {
-  forceDeopt = 0;
+function TestInlinedGetter(context, obj, expected) {
+  forceDeopt = { deopt: 0 };
   accessorCallCount = 0;
 
-  assertEquals(expected, context());
+  assertEquals(expected, context(obj));
   assertEquals(1, accessorCallCount);
 
-  assertEquals(expected, context());
+  assertEquals(expected, context(obj));
   assertEquals(2, accessorCallCount);
 
   %OptimizeFunctionOnNextCall(context);
-  assertEquals(expected, context());
+  assertEquals(expected, context(obj));
   assertEquals(3, accessorCallCount);
 
-  %DeoptimizeFunction(context);
-  %ClearFunctionTypeFeedback(context);
+  forceDeopt = { /* empty*/ };
+  assertEquals(expected, context(obj));
+  assertEquals(4, accessorCallCount);
 }
 
 
-function TestGetterInAllContexts(obj, expected) {
-  function value_context() {
-    return obj.getterProperty;
+function value_context_for_getter(obj) {
+  return obj.getterProperty;
+}
+
+function test_context_for_getter(obj) {
+  if (obj.getterProperty) {
+    return 111;
+  } else {
+    return 222;
   }
-  TestInlinedGetter(value_context, expected);
+}
 
-  function test_context() {
-    if (obj.getterProperty) {
-      return 111;
-    } else {
-      return 222;
-    }
+function effect_context_for_getter(obj) {
+  obj.getterProperty;
+  return 5678;
+}
+
+function TryGetter(context, getter, obj, expected, expectException) {
+  try {
+    TestInlinedGetter(context, obj, expected);
+    assertFalse(expectException);
+  } catch (exception) {
+    assertTrue(expectException);
+    assertEquals(7, exception.stack.split('\n').length);
   }
-  TestInlinedGetter(test_context, expected ? 111 : 222);
+  %DeoptimizeFunction(context);
+  %ClearFunctionTypeFeedback(context);
+  %ClearFunctionTypeFeedback(getter);
+}
 
-  function effect_context() {
-    obj.getterProperty;
-    return 5678;
-  }
-  TestInlinedGetter(effect_context, 5678);
+function TestGetterInAllContexts(getter, obj, expected, expectException) {
+  TryGetter(value_context_for_getter, getter, obj, expected, expectException);
+  TryGetter(test_context_for_getter, getter, obj, expected ? 111 : 222,
+            expectException);
+  TryGetter(effect_context_for_getter, getter, obj, 5678, expectException);
 }
 
 // -----------------------------------------------------------------------------
 // Test getter returning something 'true'ish in all contexts.
 
 function getter1() {
   assertSame(obj, this);
   accessorCallCount++;
-  forceDeopt + 1;
+  forceDeopt.deopt;
   return 1234;
 }
 
 function ConstrG1() { }
 obj = Object.defineProperty(new ConstrG1(), "getterProperty", { get: getter1 });
-TestGetterInAllContexts(obj, 1234);
+TestGetterInAllContexts(getter1, obj, 1234, false);
 obj = Object.create(obj);
-TestGetterInAllContexts(obj, 1234);
+TestGetterInAllContexts(getter1, obj, 1234, false);
 
 // -----------------------------------------------------------------------------
 // Test getter returning false in all contexts.
 
 function getter2() {
   assertSame(obj, this);
   accessorCallCount++;
-  forceDeopt + 1;
+  forceDeopt.deopt;
   return false;
 }
 
 function ConstrG2() { }
 obj = Object.defineProperty(new ConstrG2(), "getterProperty", { get: getter2 });
-TestGetterInAllContexts(obj, false);
+TestGetterInAllContexts(getter2, obj, false, false);
 obj = Object.create(obj);
-TestGetterInAllContexts(obj, false);
+TestGetterInAllContexts(getter2, obj, false, false);
 
 // -----------------------------------------------------------------------------
 // Test getter without a return in all contexts.
 
 function getter3() {
   assertSame(obj, this);
   accessorCallCount++;
-  forceDeopt + 1;
+  forceDeopt.deopt;
 }
 
 function ConstrG3() { }
 obj = Object.defineProperty(new ConstrG3(), "getterProperty", { get: getter3 });
-TestGetterInAllContexts(obj, undefined);
+TestGetterInAllContexts(getter3, obj, undefined, false);
 obj = Object.create(obj);
-TestGetterInAllContexts(obj, undefined);
+TestGetterInAllContexts(getter3, obj, undefined, false);
 
 // -----------------------------------------------------------------------------
 // Test getter with too many arguments without a return in all contexts.
 
 function getter4(a) {
   assertSame(obj, this);
   assertEquals(undefined, a);
   accessorCallCount++;
-  forceDeopt + 1;
+  forceDeopt.deopt;
 }
 
 function ConstrG4() { }
 obj = Object.defineProperty(new ConstrG4(), "getterProperty", { get: getter4 });
-TestGetterInAllContexts(obj, undefined);
+TestGetterInAllContexts(getter4, obj, undefined, false);
 obj = Object.create(obj);
-TestGetterInAllContexts(obj, undefined);
+TestGetterInAllContexts(getter4, obj, undefined, false);
 
 // -----------------------------------------------------------------------------
 // Test getter with too many arguments with a return in all contexts.
 
 function getter5(a) {
   assertSame(obj, this);
   assertEquals(undefined, a);
   accessorCallCount++;
-  forceDeopt + 1;
+  forceDeopt.deopt;
   return 9876;
 }
 
 function ConstrG5() { }
 obj = Object.defineProperty(new ConstrG5(), "getterProperty", { get: getter5 });
-TestGetterInAllContexts(obj, 9876);
+TestGetterInAllContexts(getter5, obj, 9876, false);
 obj = Object.create(obj);
-TestGetterInAllContexts(obj, 9876);
+TestGetterInAllContexts(getter5, obj, 9876, false);
+
+// -----------------------------------------------------------------------------
+// Test getter which throws from optimized code.
+
+function getter6() {
+  assertSame(obj, this);
+  accessorCallCount++;
+  forceDeopt.deopt;
+  if (accessorCallCount == 4) { 123 in null; }
+  return 13579;
+}
+
+function ConstrG6() { }
+obj = Object.defineProperty(new ConstrG6(), "getterProperty", { get: getter6 });
+TestGetterInAllContexts(getter6, obj, 13579, true);
+obj = Object.create(obj);
+TestGetterInAllContexts(getter6, obj, 13579, true);
 
 // -----------------------------------------------------------------------------
 // Helpers for testing inlining of setters.
 
-function TestInlinedSetter(context, value, expected) {
-  forceDeopt = 0;
+function TestInlinedSetter(context, obj, value, expected) {
+  forceDeopt = { deopt: 0 };
   accessorCallCount = 0;
   setterArgument = value;
 
-  assertEquals(expected, context(value));
+  assertEquals(expected, context(obj, value));
   assertEquals(value, setterValue);
   assertEquals(1, accessorCallCount);
 
-  assertEquals(expected, context(value));
+  assertEquals(expected, context(obj, value));
   assertEquals(value, setterValue);
   assertEquals(2, accessorCallCount);
 
   %OptimizeFunctionOnNextCall(context);
-  assertEquals(expected, context(value));
+  assertEquals(expected, context(obj, value));
   assertEquals(value, setterValue);
   assertEquals(3, accessorCallCount);
 
+  forceDeopt = { /* empty*/ };
+  assertEquals(expected, context(obj, value));
+  assertEquals(value, setterValue);
+  assertEquals(4, accessorCallCount);
+}
+
+function value_context_for_setter(obj, value) {
+  return obj.setterProperty = value;
+}
+
+function test_context_for_setter(obj, value) {
+  if (obj.setterProperty = value) {
+    return 333;
+  } else {
+    return 444;
+  }
+}
+
+function effect_context_for_setter(obj, value) {
+  obj.setterProperty = value;
+  return 666;
+}
+
+function TrySetter(context, setter, obj, expectException, value, expected) {
+  try {
+    TestInlinedSetter(context, obj, value, expected);
+    assertFalse(expectException);
+  } catch (exception) {
+    assertTrue(expectException);
+    assertEquals(7, exception.stack.split('\n').length);
+  }
   %DeoptimizeFunction(context);
   %ClearFunctionTypeFeedback(context);
+  %ClearFunctionTypeFeedback(setter);
 }
 
-function TestSetterInAllContexts(obj) {
-  function value_context(value) {
-    return obj.setterProperty = value;
-  }
-  TestInlinedSetter(value_context, 111, 111);
-
-  function test_context(value) {
-    if (obj.setterProperty = value) {
-      return 333;
-    } else {
-      return 444;
-    }
-  }
-  TestInlinedSetter(test_context, true, 333);
-  TestInlinedSetter(test_context, false, 444);
-
-  function effect_context(value) {
-    obj.setterProperty = value;
-    return 666;
-  }
-  TestInlinedSetter(effect_context, 555, 666);
+function TestSetterInAllContexts(setter, obj, expectException) {
+  TrySetter(value_context_for_setter, setter, obj, expectException, 111, 111);
+  TrySetter(test_context_for_setter, setter, obj, expectException, true, 333);
+  TrySetter(test_context_for_setter, setter, obj, expectException, false, 444);
+  TrySetter(effect_context_for_setter, setter, obj, expectException, 555, 666);
 }
 
 // -----------------------------------------------------------------------------
 // Test setter without a return in all contexts.
 
 function setter1(value) {
   assertSame(obj, this);
   accessorCallCount++;
-  forceDeopt + 1;
+  forceDeopt.deopt;
   setterValue = value;
 }
 
 function ConstrS1() { }
 obj = Object.defineProperty(new ConstrS1(), "setterProperty", { set: setter1 });
-TestSetterInAllContexts(obj);
+TestSetterInAllContexts(setter1, obj, false);
 obj = Object.create(obj);
-TestSetterInAllContexts(obj);
+TestSetterInAllContexts(setter1, obj, false);
 
 // -----------------------------------------------------------------------------
 // Test setter returning something different than the RHS in all contexts.
 
 function setter2(value) {
   assertSame(obj, this);
   accessorCallCount++;
-  forceDeopt + 1;
+  forceDeopt.deopt;
   setterValue = value;
   return 1000000;
 }
 
 function ConstrS2() { }
 obj = Object.defineProperty(new ConstrS2(), "setterProperty", { set: setter2 });
-TestSetterInAllContexts(obj);
+TestSetterInAllContexts(setter2, obj, false);
 obj = Object.create(obj);
-TestSetterInAllContexts(obj);
+TestSetterInAllContexts(setter2, obj, false);
 
 // -----------------------------------------------------------------------------
 // Test setter with too few arguments without a return in all contexts.
 
 function setter3() {
   assertSame(obj, this);
   accessorCallCount++;
-  forceDeopt + 1;
+  forceDeopt.deopt;
   setterValue = setterArgument;
 }
 
 function ConstrS3() { }
 obj = Object.defineProperty(new ConstrS3(), "setterProperty", { set: setter3 });
-TestSetterInAllContexts(obj);
+TestSetterInAllContexts(setter3, obj, false);
 obj = Object.create(obj);
-TestSetterInAllContexts(obj);
+TestSetterInAllContexts(setter3, obj, false);
 
 // -----------------------------------------------------------------------------
 // Test setter with too few arguments with a return in all contexts.
 
 function setter4() {
   assertSame(obj, this);
   accessorCallCount++;
-  forceDeopt + 1;
+  forceDeopt.deopt;
   setterValue = setterArgument;
   return 2000000;
 }
 
 function ConstrS4() { }
 obj = Object.defineProperty(new ConstrS4(), "setterProperty", { set: setter4 });
-TestSetterInAllContexts(obj);
+TestSetterInAllContexts(setter4, obj, false);
 obj = Object.create(obj);
-TestSetterInAllContexts(obj);
+TestSetterInAllContexts(setter4, obj, false);
 
 // -----------------------------------------------------------------------------
 // Test setter with too many arguments without a return in all contexts.
 
 function setter5(value, foo) {
   assertSame(obj, this);
   assertEquals(undefined, foo);
   accessorCallCount++;
-  forceDeopt + 1;
+  forceDeopt.deopt;
   setterValue = value;
 }
 
 function ConstrS5() { }
 obj = Object.defineProperty(new ConstrS5(), "setterProperty", { set: setter5 });
-TestSetterInAllContexts(obj);
+TestSetterInAllContexts(setter5, obj, false);
 obj = Object.create(obj);
-TestSetterInAllContexts(obj);
+TestSetterInAllContexts(setter5, obj, false);
 
 // -----------------------------------------------------------------------------
 // Test setter with too many arguments with a return in all contexts.
 
 function setter6(value, foo) {
   assertSame(obj, this);
   assertEquals(undefined, foo);
   accessorCallCount++;
-  forceDeopt + 1;
+  forceDeopt.deopt;
   setterValue = value;
   return 3000000;
 }
 
 function ConstrS6() { }
 obj = Object.defineProperty(new ConstrS6(), "setterProperty", { set: setter6 });
-TestSetterInAllContexts(obj);
+TestSetterInAllContexts(setter6, obj, false);
 obj = Object.create(obj);
-TestSetterInAllContexts(obj);
+TestSetterInAllContexts(setter6, obj, false);
+
+// -----------------------------------------------------------------------------
+// Test setter which throws from optimized code.
+
+function setter7(value) {
+  accessorCallCount++;
+  forceDeopt.deopt;
+  if (accessorCallCount == 4) { 123 in null; }
+  setterValue = value;
+}
+
+function ConstrS7() { }
+obj = Object.defineProperty(new ConstrS7(), "setterProperty", { set: setter7 });
+TestSetterInAllContexts(setter7, obj, true);
+obj = Object.create(obj);
+TestSetterInAllContexts(setter7, obj, true);