[heap] Reland "Remove black pages and use black areas instead."

test/unittests/heap/marking-unittest.cc

 // Copyright 2016 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <stdlib.h>
 
 #include "src/globals.h"
 #include "src/heap/marking.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
@@ skipping 92 matching lines @@
     CHECK(Marking::IsGrey(mark_bit));
     CHECK(Marking::IsBlackOrGrey(mark_bit));
     CHECK(!Marking::IsImpossible(mark_bit));
     Marking::MarkWhite(mark_bit);
     CHECK(Marking::IsWhite(mark_bit));
     CHECK(!Marking::IsImpossible(mark_bit));
   }
   free(bitmap);
 }
 
+TEST(Marking, SetAndClearRange) {
+  Bitmap* bitmap = reinterpret_cast<Bitmap*>(
+      calloc(Bitmap::kSize / kPointerSize, kPointerSize));
+  for (int i = 0; i < 3; i++) {
+    bitmap->SetRange(i, Bitmap::kBitsPerCell + i);
+    CHECK_EQ(reinterpret_cast<uint32_t*>(bitmap)[0], 0xffffffff << i);
+    CHECK_EQ(reinterpret_cast<uint32_t*>(bitmap)[1], (1 << i) - 1);
+    bitmap->ClearRange(i, Bitmap::kBitsPerCell + i);
+    CHECK_EQ(reinterpret_cast<uint32_t*>(bitmap)[0], 0x0);
+    CHECK_EQ(reinterpret_cast<uint32_t*>(bitmap)[1], 0x0);
+  }
+  free(bitmap);
+}
+
+TEST(Marking, ClearMultipleRanges) {
+  Bitmap* bitmap = reinterpret_cast<Bitmap*>(
+      calloc(Bitmap::kSize / kPointerSize, kPointerSize));
+  CHECK(bitmap->AllBitsClearInRange(0, Bitmap::kBitsPerCell * 3));
+  bitmap->SetRange(0, Bitmap::kBitsPerCell * 3);
+  CHECK_EQ(reinterpret_cast<uint32_t*>(bitmap)[0], 0xffffffff);
+  CHECK_EQ(reinterpret_cast<uint32_t*>(bitmap)[1], 0xffffffff);
+  CHECK_EQ(reinterpret_cast<uint32_t*>(bitmap)[2], 0xffffffff);
+  CHECK(bitmap->AllBitsSetInRange(0, Bitmap::kBitsPerCell * 3));
+  bitmap->ClearRange(Bitmap::kBitsPerCell / 2, Bitmap::kBitsPerCell);
+  bitmap->ClearRange(Bitmap::kBitsPerCell,
+                     Bitmap::kBitsPerCell + Bitmap::kBitsPerCell / 2);
+  bitmap->ClearRange(Bitmap::kBitsPerCell * 2 + 8,
+                     Bitmap::kBitsPerCell * 2 + 16);
+  bitmap->ClearRange(Bitmap::kBitsPerCell * 2 + 24, Bitmap::kBitsPerCell * 3);
+  CHECK_EQ(reinterpret_cast<uint32_t*>(bitmap)[0], 0xffff);
+  CHECK(bitmap->AllBitsSetInRange(0, Bitmap::kBitsPerCell / 2));
+  CHECK(bitmap->AllBitsClearInRange(Bitmap::kBitsPerCell / 2,
+                                    Bitmap::kBitsPerCell));
+  CHECK_EQ(reinterpret_cast<uint32_t*>(bitmap)[1], 0xffff0000);
+  CHECK(
+      bitmap->AllBitsSetInRange(Bitmap::kBitsPerCell + Bitmap::kBitsPerCell / 2,
+                                2 * Bitmap::kBitsPerCell));
+  CHECK(bitmap->AllBitsClearInRange(
+      Bitmap::kBitsPerCell, Bitmap::kBitsPerCell + Bitmap::kBitsPerCell / 2));
+  CHECK_EQ(reinterpret_cast<uint32_t*>(bitmap)[2], 0xff00ff);
+  CHECK(bitmap->AllBitsSetInRange(2 * Bitmap::kBitsPerCell,
+                                  2 * Bitmap::kBitsPerCell + 8));
+  CHECK(bitmap->AllBitsClearInRange(2 * Bitmap::kBitsPerCell + 24,
+                                    Bitmap::kBitsPerCell * 3));
+  free(bitmap);
+}
 }  // namespace internal
 }  // namespace v8