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// Copyright 2014 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/memory/discardable_memory.h"
#include "base/lazy_instance.h"
#include "base/logging.h"
namespace base {
namespace {
const struct TypeNamePair {
DiscardableMemoryType type;
const char* name;
} kTypeNamePairs[] = {
{ DISCARDABLE_MEMORY_TYPE_ASHMEM, "ashmem" },
{ DISCARDABLE_MEMORY_TYPE_MAC, "mac" },
{ DISCARDABLE_MEMORY_TYPE_EMULATED, "emulated" },
{ DISCARDABLE_MEMORY_TYPE_MALLOC, "malloc" }
};
DiscardableMemoryType g_preferred_type = DISCARDABLE_MEMORY_TYPE_NONE;
struct DefaultPreferredType {
DefaultPreferredType() : value(DISCARDABLE_MEMORY_TYPE_NONE) {
std::vector<DiscardableMemoryType> supported_types;
DiscardableMemory::GetSupportedTypes(&supported_types);
DCHECK(!supported_types.empty());
value = supported_types[0];
}
DiscardableMemoryType value;
};
LazyInstance<DefaultPreferredType>::Leaky g_default_preferred_type =
LAZY_INSTANCE_INITIALIZER;
} // namespace
// static
DiscardableMemoryType DiscardableMemory::GetNamedType(
const std::string& name) {
for (size_t i = 0; i < arraysize(kTypeNamePairs); ++i) {
if (name == kTypeNamePairs[i].name)
return kTypeNamePairs[i].type;
}
return DISCARDABLE_MEMORY_TYPE_NONE;
}
// static
const char* DiscardableMemory::GetTypeName(DiscardableMemoryType type) {
for (size_t i = 0; i < arraysize(kTypeNamePairs); ++i) {
if (type == kTypeNamePairs[i].type)
return kTypeNamePairs[i].name;
}
return "unknown";
}
// static
void DiscardableMemory::SetPreferredType(DiscardableMemoryType type) {
// NONE is a reserved value and not a valid default type.
DCHECK_NE(DISCARDABLE_MEMORY_TYPE_NONE, type);
// Make sure this function is only called once before the first call
// to GetPreferredType().
DCHECK_EQ(DISCARDABLE_MEMORY_TYPE_NONE, g_preferred_type);
g_preferred_type = type;
}
// static
DiscardableMemoryType DiscardableMemory::GetPreferredType() {
if (g_preferred_type == DISCARDABLE_MEMORY_TYPE_NONE)
g_preferred_type = g_default_preferred_type.Get().value;
return g_preferred_type;
}
// static
scoped_ptr<DiscardableMemory> DiscardableMemory::CreateLockedMemory(
size_t size) {
return CreateLockedMemoryWithType(GetPreferredType(), size);
}
} // namespace base
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