First implementation of HUnique<T> and HUniqueSet<T>, which is supposed to replace UniqueValueId.

test/cctest/test-unique.cc

Index: test/cctest/test-unique.cc
diff --git a/test/cctest/test-unique.cc b/test/cctest/test-unique.cc
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+// Copyright 2013 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.
+
+#include <stdlib.h>
+
+#include "v8.h"
+
+#include "factory.h"
+#include "global-handles.h"
+#include "unique.h"
+#include "cctest.h"
+
+using namespace v8::internal;
+
+TEST(UniqueCreate) {
+  CcTest::InitializeVM();
+  Isolate* isolate = Isolate::Current();
+  Factory* factory = isolate->factory();
+  HandleScope sc(isolate);
+
+  Handle<String> A = factory->InternalizeUtf8String("A");
+  Unique<String> HA(A);
+
+  CHECK_NE(0, HA.Hashcode());
+  CHECK(*HA.handle() == *A);
+  CHECK_EQ(*A, *HA.handle());
+
+  Unique<String> HA2(A);
+
+  CHECK_EQ(HA.Hashcode(), HA2.Hashcode());
+  CHECK(HA == HA2);
+  CHECK_EQ(*HA.handle(), *HA2.handle());
+
+  CHECK_EQ(HA2.Hashcode(), HA.Hashcode());
+  CHECK(HA2 == HA);
+  CHECK_EQ(*HA2.handle(), *HA.handle());
+
+  Handle<String> B = factory->InternalizeUtf8String("B");
+  Unique<String> HB(B);
+
+  CHECK_NE(HA.Hashcode(), HB.Hashcode());
+  CHECK(HA != HB);
+  CHECK_NE(*HA.handle(), *HB.handle());
+
+  CHECK_NE(HB.Hashcode(), HA.Hashcode());
+  CHECK(HB != HA);
+  CHECK_NE(*HB.handle(), *HA.handle());
+
+  // TODO(titzer): check that Unique properly survives a GC.
+}
+
+
+TEST(UniqueSubsume) {
+  CcTest::InitializeVM();
+  Isolate* isolate = Isolate::Current();
+  Factory* factory = isolate->factory();
+  HandleScope sc(isolate);
+
+  Handle<String> A = factory->InternalizeUtf8String("A");
+  Unique<String> HA(A);
+
+  CHECK_NE(0, HA.Hashcode());
+  CHECK(*HA.handle() == *A);
+  CHECK_EQ(*A, *HA.handle());
+
+  Unique<Object> HO = HA;  // Here comes the subsumption, boys.
+
+  CHECK_EQ(HA.Hashcode(), HO.Hashcode());
+  CHECK(HA == HO);
+  CHECK_EQ(*HA.handle(), *HO.handle());
+
+  CHECK_EQ(HO.Hashcode(), HA.Hashcode());
+  CHECK(HO == HA);
+  CHECK_EQ(*HO.handle(), *HA.handle());
+}
+
+
+TEST(UniqueSet_Add) {
+  CcTest::InitializeVM();
+  Isolate* isolate = Isolate::Current();
+  Factory* factory = isolate->factory();
+  HandleScope sc(isolate);
+
+  Unique<String> A(factory->InternalizeUtf8String("A"));
+  Unique<String> B(factory->InternalizeUtf8String("B"));
+  Unique<String> C(factory->InternalizeUtf8String("C"));
+
+  Zone zone(isolate);
+
+  UniqueSet<String>* set = new(&zone) UniqueSet<String>();
+
+  CHECK_EQ(0, set->size());
+  set->Add(A, &zone);
+  CHECK_EQ(1, set->size());
+  set->Add(A, &zone);
+  CHECK_EQ(1, set->size());
+  set->Add(B, &zone);
+  CHECK_EQ(2, set->size());
+  set->Add(C, &zone);
+  CHECK_EQ(3, set->size());
+  set->Add(C, &zone);
+  CHECK_EQ(3, set->size());
+  set->Add(B, &zone);
+  CHECK_EQ(3, set->size());
+  set->Add(A, &zone);
+  CHECK_EQ(3, set->size());
+}
+
+
+template <class T>
+static void CHECK_SETS(
+    UniqueSet<T>* set1, UniqueSet<T>* set2, bool expected) {
+  CHECK(set1->Equals(set1));
+  CHECK(set2->Equals(set2));
+  CHECK(expected == set1->Equals(set2));
+  CHECK(expected == set2->Equals(set1));
+}
+
+
+TEST(UniqueSet_Equals) {
+  CcTest::InitializeVM();
+  Isolate* isolate = Isolate::Current();
+  Factory* factory = isolate->factory();
+  HandleScope sc(isolate);
+
+  Unique<String> A(factory->InternalizeUtf8String("A"));
+  Unique<String> B(factory->InternalizeUtf8String("B"));
+  Unique<String> C(factory->InternalizeUtf8String("C"));
+
+  Zone zone(isolate);
+
+  UniqueSet<String>* set1 = new(&zone) UniqueSet<String>();
+  UniqueSet<String>* set2 = new(&zone) UniqueSet<String>();
+
+  CHECK_SETS(set1, set2, true);
+
+  set1->Add(A, &zone);
+
+  CHECK_SETS(set1, set2, false);
+
+  set2->Add(A, &zone);
+
+  CHECK_SETS(set1, set2, true);
+
+  set1->Add(B, &zone);
+
+  CHECK_SETS(set1, set2, false);
+
+  set2->Add(C, &zone);
+
+  CHECK_SETS(set1, set2, false);
+
+  set1->Add(C, &zone);
+
+  CHECK_SETS(set1, set2, false);
+
+  set2->Add(B, &zone);
+
+  CHECK_SETS(set1, set2, true);
+}
+
+
+TEST(UniqueSet_IsSubset1) {
+  CcTest::InitializeVM();
+  Isolate* isolate = Isolate::Current();
+  Factory* factory = isolate->factory();
+  HandleScope sc(isolate);
+
+  Unique<String> A(factory->InternalizeUtf8String("A"));
+  Unique<String> B(factory->InternalizeUtf8String("B"));
+  Unique<String> C(factory->InternalizeUtf8String("C"));
+
+  Zone zone(isolate);
+
+  UniqueSet<String>* set1 = new(&zone) UniqueSet<String>();
+  UniqueSet<String>* set2 = new(&zone) UniqueSet<String>();
+
+  CHECK(set1->IsSubset(set2));
+  CHECK(set2->IsSubset(set1));
+
+  set1->Add(A, &zone);
+
+  CHECK(!set1->IsSubset(set2));
+  CHECK(set2->IsSubset(set1));
+
+  set2->Add(B, &zone);
+
+  CHECK(!set1->IsSubset(set2));
+  CHECK(!set2->IsSubset(set1));
+
+  set2->Add(A, &zone);
+
+  CHECK(set1->IsSubset(set2));
+  CHECK(!set2->IsSubset(set1));
+
+  set1->Add(B, &zone);
+
+  CHECK(set1->IsSubset(set2));
+  CHECK(set2->IsSubset(set1));
+}
+
+
+TEST(UniqueSet_IsSubset2) {
+  CcTest::InitializeVM();
+  Isolate* isolate = Isolate::Current();
+  Factory* factory = isolate->factory();
+  HandleScope sc(isolate);
+
+  Unique<String> A(factory->InternalizeUtf8String("A"));
+  Unique<String> B(factory->InternalizeUtf8String("B"));
+  Unique<String> C(factory->InternalizeUtf8String("C"));
+  Unique<String> D(factory->InternalizeUtf8String("D"));
+  Unique<String> E(factory->InternalizeUtf8String("E"));
+  Unique<String> F(factory->InternalizeUtf8String("F"));
+  Unique<String> G(factory->InternalizeUtf8String("G"));
+
+  Zone zone(isolate);
+
+  UniqueSet<String>* set1 = new(&zone) UniqueSet<String>();
+  UniqueSet<String>* set2 = new(&zone) UniqueSet<String>();
+
+  set1->Add(A, &zone);
+  set1->Add(C, &zone);
+  set1->Add(E, &zone);
+
+  set2->Add(A, &zone);
+  set2->Add(B, &zone);
+  set2->Add(C, &zone);
+  set2->Add(D, &zone);
+  set2->Add(E, &zone);
+  set2->Add(F, &zone);
+
+  CHECK(set1->IsSubset(set2));
+  CHECK(!set2->IsSubset(set1));
+
+  set1->Add(G, &zone);
+
+  CHECK(!set1->IsSubset(set2));
+  CHECK(!set2->IsSubset(set1));
+}
+
+
+template <class T>
+static UniqueSet<T>* MakeSet(Zone* zone, int which, Unique<T>* elements) {
+  UniqueSet<T>* set = new(zone) UniqueSet<T>();
+  for (int i = 0; i < 32; i++) {
+    if ((which & (1 << i)) != 0) set->Add(elements[i], zone);
+  }
+  return set;
+}
+
+
+TEST(UniqueSet_IsSubsetExhaustive) {
+  const int kSetSize = 6;
+
+  CcTest::InitializeVM();
+  Isolate* isolate = Isolate::Current();
+  Factory* factory = isolate->factory();
+  HandleScope sc(isolate);
+
+  Zone zone(isolate);
+
+  Unique<String> A(factory->InternalizeUtf8String("A"));
+  Unique<String> B(factory->InternalizeUtf8String("B"));
+  Unique<String> C(factory->InternalizeUtf8String("C"));
+  Unique<String> D(factory->InternalizeUtf8String("D"));
+  Unique<String> E(factory->InternalizeUtf8String("E"));
+  Unique<String> F(factory->InternalizeUtf8String("F"));
+  Unique<String> G(factory->InternalizeUtf8String("G"));
+
+  Unique<String> elements[] = {
+    A, B, C, D, E, F, G
+  };
+
+  // Exhaustively test all sets with <= 6 elements.
+  for (int i = 0; i < (1 << kSetSize); i++) {
+    for (int j = 0; j < (1 << kSetSize); j++) {
+      UniqueSet<String>* set1 = MakeSet(&zone, i, elements);
+      UniqueSet<String>* set2 = MakeSet(&zone, j, elements);
+
+      CHECK(((i & j) == i) == set1->IsSubset(set2));
+    }
+  }
+}
+
+
+TEST(UniqueSet_Intersect1) {
+  CcTest::InitializeVM();
+  Isolate* isolate = Isolate::Current();
+  Factory* factory = isolate->factory();
+  HandleScope sc(isolate);
+
+  Unique<String> A(factory->InternalizeUtf8String("A"));
+  Unique<String> B(factory->InternalizeUtf8String("B"));
+  Unique<String> C(factory->InternalizeUtf8String("C"));
+
+  Zone zone(isolate);
+
+  UniqueSet<String>* set1 = new(&zone) UniqueSet<String>();
+  UniqueSet<String>* set2 = new(&zone) UniqueSet<String>();
+  UniqueSet<String>* result;
+
+  CHECK(set1->IsSubset(set2));
+  CHECK(set2->IsSubset(set1));
+
+  set1->Add(A, &zone);
+
+  result = set1->Intersect(set2, &zone);
+
+  CHECK_EQ(0, result->size());
+  CHECK(set2->Equals(result));
+
+  set2->Add(A, &zone);
+
+  result = set1->Intersect(set2, &zone);
+
+  CHECK_EQ(1, result->size());
+  CHECK(set1->Equals(result));
+  CHECK(set2->Equals(result));
+
+  set2->Add(B, &zone);
+  set2->Add(C, &zone);
+
+  result = set1->Intersect(set2, &zone);
+
+  CHECK_EQ(1, result->size());
+  CHECK(set1->Equals(result));
+}
+
+
+TEST(UniqueSet_IntersectExhaustive) {
+  const int kSetSize = 6;
+
+  CcTest::InitializeVM();
+  Isolate* isolate = Isolate::Current();
+  Factory* factory = isolate->factory();
+  HandleScope sc(isolate);
+
+  Zone zone(isolate);
+
+  Unique<String> A(factory->InternalizeUtf8String("A"));
+  Unique<String> B(factory->InternalizeUtf8String("B"));
+  Unique<String> C(factory->InternalizeUtf8String("C"));
+  Unique<String> D(factory->InternalizeUtf8String("D"));
+  Unique<String> E(factory->InternalizeUtf8String("E"));
+  Unique<String> F(factory->InternalizeUtf8String("F"));
+  Unique<String> G(factory->InternalizeUtf8String("G"));
+
+  Unique<String> elements[] = {
+    A, B, C, D, E, F, G
+  };
+
+  // Exhaustively test all sets with <= 6 elements.
+  for (int i = 0; i < (1 << kSetSize); i++) {
+    for (int j = 0; j < (1 << kSetSize); j++) {
+      UniqueSet<String>* set1 = MakeSet(&zone, i, elements);
+      UniqueSet<String>* set2 = MakeSet(&zone, j, elements);
+
+      UniqueSet<String>* result = set1->Intersect(set2, &zone);
+      UniqueSet<String>* expected = MakeSet(&zone, i & j, elements);
+
+      CHECK(result->Equals(expected));
+      CHECK(expected->Equals(result));
+    }
+  }
+}
+
+
+TEST(UniqueSet_Union1) {
+  CcTest::InitializeVM();
+  Isolate* isolate = Isolate::Current();
+  Factory* factory = isolate->factory();
+  HandleScope sc(isolate);
+
+  Unique<String> A(factory->InternalizeUtf8String("A"));
+  Unique<String> B(factory->InternalizeUtf8String("B"));
+  Unique<String> C(factory->InternalizeUtf8String("C"));
+
+  Zone zone(isolate);
+
+  UniqueSet<String>* set1 = new(&zone) UniqueSet<String>();
+  UniqueSet<String>* set2 = new(&zone) UniqueSet<String>();
+  UniqueSet<String>* result;
+
+  CHECK(set1->IsSubset(set2));
+  CHECK(set2->IsSubset(set1));
+
+  set1->Add(A, &zone);
+
+  result = set1->Union(set2, &zone);
+
+  CHECK_EQ(1, result->size());
+  CHECK(set1->Equals(result));
+
+  set2->Add(A, &zone);
+
+  result = set1->Union(set2, &zone);
+
+  CHECK_EQ(1, result->size());
+  CHECK(set1->Equals(result));
+  CHECK(set2->Equals(result));
+
+  set2->Add(B, &zone);
+  set2->Add(C, &zone);
+
+  result = set1->Union(set2, &zone);
+
+  CHECK_EQ(3, result->size());
+  CHECK(set2->Equals(result));
+}
+
+
+TEST(UniqueSet_UnionExhaustive) {
+  const int kSetSize = 6;
+
+  CcTest::InitializeVM();
+  Isolate* isolate = Isolate::Current();
+  Factory* factory = isolate->factory();
+  HandleScope sc(isolate);
+
+  Zone zone(isolate);
+
+  Unique<String> A(factory->InternalizeUtf8String("A"));
+  Unique<String> B(factory->InternalizeUtf8String("B"));
+  Unique<String> C(factory->InternalizeUtf8String("C"));
+  Unique<String> D(factory->InternalizeUtf8String("D"));
+  Unique<String> E(factory->InternalizeUtf8String("E"));
+  Unique<String> F(factory->InternalizeUtf8String("F"));
+  Unique<String> G(factory->InternalizeUtf8String("G"));
+
+  Unique<String> elements[] = {
+    A, B, C, D, E, F, G
+  };
+
+  // Exhaustively test all sets with <= 6 elements.
+  for (int i = 0; i < (1 << kSetSize); i++) {
+    for (int j = 0; j < (1 << kSetSize); j++) {
+      UniqueSet<String>* set1 = MakeSet(&zone, i, elements);
+      UniqueSet<String>* set2 = MakeSet(&zone, j, elements);
+
+      UniqueSet<String>* result = set1->Union(set2, &zone);
+      UniqueSet<String>* expected = MakeSet(&zone, i | j, elements);
+
+      CHECK(result->Equals(expected));
+      CHECK(expected->Equals(result));
+    }
+  }
+}
+