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//
// Copyright (c) 2015 The ANGLE 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.
//
// Cache.cpp: Implements a cache for various commonly created objects.
#include <limits>
#include "common/angleutils.h"
#include "common/debug.h"
#include "compiler/translator/Cache.h"
namespace sh
{
namespace
{
class TScopedAllocator : angle::NonCopyable
{
public:
TScopedAllocator(TPoolAllocator *allocator)
: mPreviousAllocator(GetGlobalPoolAllocator())
{
SetGlobalPoolAllocator(allocator);
}
~TScopedAllocator()
{
SetGlobalPoolAllocator(mPreviousAllocator);
}
private:
TPoolAllocator *mPreviousAllocator;
};
} // namespace
TCache::TypeKey::TypeKey(TBasicType basicType,
TPrecision precision,
TQualifier qualifier,
unsigned char primarySize,
unsigned char secondarySize)
{
static_assert(sizeof(components) <= sizeof(value),
"TypeKey::value is too small");
const size_t MaxEnumValue = std::numeric_limits<EnumComponentType>::max();
// TODO: change to static_assert() once we deprecate MSVC 2013 support
ASSERT(MaxEnumValue >= EbtLast &&
MaxEnumValue >= EbpLast &&
MaxEnumValue >= EvqLast &&
"TypeKey::EnumComponentType is too small");
value = 0;
components.basicType = static_cast<EnumComponentType>(basicType);
components.precision = static_cast<EnumComponentType>(precision);
components.qualifier = static_cast<EnumComponentType>(qualifier);
components.primarySize = primarySize;
components.secondarySize = secondarySize;
}
TCache *TCache::sCache = nullptr;
void TCache::initialize()
{
if (sCache == nullptr)
{
sCache = new TCache();
}
}
void TCache::destroy()
{
SafeDelete(sCache);
}
const TType *TCache::getType(TBasicType basicType,
TPrecision precision,
TQualifier qualifier,
unsigned char primarySize,
unsigned char secondarySize)
{
TypeKey key(basicType, precision, qualifier,
primarySize, secondarySize);
auto it = sCache->mTypes.find(key);
if (it != sCache->mTypes.end())
{
return it->second;
}
TScopedAllocator scopedAllocator(&sCache->mAllocator);
TType *type = new TType(basicType, precision, qualifier,
primarySize, secondarySize);
type->realize();
sCache->mTypes.insert(std::make_pair(key, type));
return type;
}
} // namespace sh
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