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// Copyright (c) 2012 The Chromium 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 "base/sys_info.h"
#include <sys/system_properties.h>
#include "base/logging.h"
#include "base/string_number_conversions.h"
#include "base/string_piece.h"
namespace {
int ParseHeapSize(const base::StringPiece& str) {
const int64 KB = 1024;
const int64 MB = 1024 * KB;
const int64 GB = 1024 * MB;
CHECK_GT(str.size(), 0u);
int64 factor = 1;
size_t length = str.size();
if (str[length - 1] == 'k') {
factor = KB;
length--;
} else if (str[length - 1] == 'm') {
factor = MB;
length--;
} else if (str[length - 1] == 'g') {
factor = GB;
length--;
} else {
CHECK('0' <= str[length - 1] && str[length - 1] <= '9');
}
int64 result = 0;
bool parsed = base::StringToInt64(str.substr(0, length), &result);
CHECK(parsed);
result = result * factor / MB;
// dalvik.vm.heapsize property is writable by user,
// truncate it to reasonable value to avoid overflows later.
result = std::min<int64>(std::max<int64>(32, result), 1024);
return static_cast<int>(result);
}
int GetDalvikHeapSizeMB() {
char heap_size_str[PROP_VALUE_MAX];
__system_property_get("dalvik.vm.heapsize", heap_size_str);
return ParseHeapSize(heap_size_str);
}
} // anonymous namespace
namespace base {
int SysInfo::DalvikHeapSizeMB() {
static int heap_size = GetDalvikHeapSizeMB();
return heap_size;
}
} // namespace base
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