runtime/vm/virtual_memory_test.cc

// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

#include "platform/assert.h"
#include "vm/unit_test.h"
#include "vm/virtual_memory.h"

namespace dart {

UNIT_TEST_CASE(AllocateVirtualMemory) {
  const intptr_t kVirtualMemoryBlockSize = 64 * KB;
  VirtualMemory* vm = VirtualMemory::Reserve(kVirtualMemoryBlockSize);
  EXPECT(vm != NULL);
  EXPECT(vm->address() != NULL);
  EXPECT_EQ(kVirtualMemoryBlockSize, vm->size());
  EXPECT_EQ(vm->start(), reinterpret_cast<uword>(vm->address()));
  EXPECT_EQ(vm->start() + kVirtualMemoryBlockSize, vm->end());
  EXPECT(vm->Contains(vm->start()));
  EXPECT(vm->Contains(vm->start() + 1));
  EXPECT(vm->Contains(vm->start() + kVirtualMemoryBlockSize - 1));
  EXPECT(vm->Contains(vm->start() + (kVirtualMemoryBlockSize / 2)));
  EXPECT(!vm->Contains(vm->start() - 1));
  EXPECT(!vm->Contains(vm->end()));
  EXPECT(!vm->Contains(vm->end() + 1));
  EXPECT(!vm->Contains(0));
  EXPECT(!vm->Contains(static_cast<uword>(-1)));

  vm->Commit(false);
  char* buf = reinterpret_cast<char*>(vm->address());
  buf[0] = 'a';
  buf[1] = 'c';
  buf[2] = '/';
  buf[3] = 'd';
  buf[4] = 'c';
  buf[5] = 0;
  EXPECT_STREQ("ac/dc", buf);

  delete vm;

  const intptr_t kAlignment = 1 * MB;
  vm = VirtualMemory::ReserveAligned(kVirtualMemoryBlockSize, kAlignment);
  ASSERT((vm->start() & (kAlignment - 1)) == 0);
  delete vm;
}

}  // namespace dart