[heap] Simplify and scale ResourceConstraints::ConfigureDefaults.

test/unittests/heap/heap-unittest.cc

 // Copyright 2014 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 <cmath>
 #include <iostream>
 #include <limits>
 
 #include "src/objects.h"
 #include "src/objects-inl.h"
@@ skipping 27 matching lines @@
   CheckEqualRounded(2.830, Heap::HeapGrowingFactor(50, 1));
   CheckEqualRounded(1.478, Heap::HeapGrowingFactor(100, 1));
   CheckEqualRounded(1.193, Heap::HeapGrowingFactor(200, 1));
   CheckEqualRounded(1.121, Heap::HeapGrowingFactor(300, 1));
   CheckEqualRounded(Heap::HeapGrowingFactor(300, 1),
                     Heap::HeapGrowingFactor(600, 2));
   CheckEqualRounded(Heap::kMinHeapGrowingFactor,
                     Heap::HeapGrowingFactor(400, 1));
 }
 
+TEST(Heap, SemiSpaceSize) {
+  uint64_t configurations[][2] = {
+      {0, 1 * i::Heap::kPointerMultiplier},
+      {512 * i::MB, 1 * i::Heap::kPointerMultiplier},
+      {1 * i::GB, 3 * i::Heap::kPointerMultiplier},
+      {2 * static_cast<uint64_t>(i::GB), i::Heap::kMaxSemiSpaceSize},
+      {4 * static_cast<uint64_t>(i::GB), i::Heap::kMaxSemiSpaceSize},
+      {8 * static_cast<uint64_t>(i::GB), i::Heap::kMaxSemiSpaceSize}};
+
+  for (auto configuration : configurations) {
+    ASSERT_EQ(configuration[1],
+              static_cast<uint64_t>(
+                  i::Heap::ComputeMaxSemiSpaceSize(configuration[0])));
+  }
+}
+
+TEST(Heap, OldGenerationSize) {
+  uint64_t configurations[][2] = {
+      {0, i::Heap::kMinOldSpaceSize},
+      {512, i::Heap::kMinOldSpaceSize},
+      {1 * i::GB, 256 * i::Heap::kPointerMultiplier},
+      {2 * static_cast<uint64_t>(i::GB), 512 * i::Heap::kPointerMultiplier},
+      {4 * static_cast<uint64_t>(i::GB), i::Heap::kMaxOldSpaceSize},
+      {8 * static_cast<uint64_t>(i::GB), i::Heap::kMaxOldSpaceSize}};
+
+  for (auto configuration : configurations) {
+    ASSERT_EQ(configuration[1],
+              static_cast<uint64_t>(
+                  i::Heap::ComputeMaxOldGenerationSize(configuration[0])));
+  }
+}
+
 }  // namespace internal
 }  // namespace v8