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-/****************************************************************************
-**
-** Copyright (C) 2018 The Qt Company Ltd.
-** Contact: https://www.qt.io/licensing/
-**
-** This file is part of the QtQml module of the Qt Toolkit.
-**
-** $QT_BEGIN_LICENSE:LGPL$
-** Commercial License Usage
-** Licensees holding valid commercial Qt licenses may use this file in
-** accordance with the commercial license agreement provided with the
-** Software or, alternatively, in accordance with the terms contained in
-** a written agreement between you and The Qt Company. For licensing terms
-** and conditions see https://www.qt.io/terms-conditions. For further
-** information use the contact form at https://www.qt.io/contact-us.
-**
-** GNU Lesser General Public License Usage
-** Alternatively, this file may be used under the terms of the GNU Lesser
-** General Public License version 3 as published by the Free Software
-** Foundation and appearing in the file LICENSE.LGPL3 included in the
-** packaging of this file. Please review the following information to
-** ensure the GNU Lesser General Public License version 3 requirements
-** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
-**
-** GNU General Public License Usage
-** Alternatively, this file may be used under the terms of the GNU
-** General Public License version 2.0 or (at your option) the GNU General
-** Public license version 3 or any later version approved by the KDE Free
-** Qt Foundation. The licenses are as published by the Free Software
-** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
-** included in the packaging of this file. Please review the following
-** information to ensure the GNU General Public License requirements will
-** be met: https://www.gnu.org/licenses/gpl-2.0.html and
-** https://www.gnu.org/licenses/gpl-3.0.html.
-**
-** $QT_END_LICENSE$
-**
-****************************************************************************/
-
-#ifndef QV4MIBLOCKSET_P_H
-#define QV4MIBLOCKSET_P_H
-
-//
-// W A R N I N G
-// -------------
-//
-// This file is not part of the Qt API. It exists purely as an
-// implementation detail. This header file may change from version to
-// version without notice, or even be removed.
-//
-// We mean it.
-//
-
-#include "qv4mi_p.h"
-#include "qv4util_p.h"
-
-QT_REQUIRE_CONFIG(qml_tracing);
-
-QT_BEGIN_NAMESPACE
-
-namespace QV4 {
-namespace IR {
-
-class MIBlockSet
-{
- using Flags = BitVector;
-
- QVarLengthArray<MIBlock::Index, 8> blockNumbers;
- Flags *blockFlags = nullptr;
- MIFunction *function = nullptr;
- enum { MaxVectorCapacity = 8 };
-
-public:
- class const_iterator;
- friend class const_iterator;
-
-public:
- MIBlockSet(MIFunction *f = nullptr)
- {
- if (f)
- init(f);
- }
-
- MIBlockSet(MIBlockSet &&other) noexcept
- {
- std::swap(blockNumbers, other.blockNumbers);
- std::swap(blockFlags, other.blockFlags);
- std::swap(function, other.function);
- }
-
- MIBlockSet(const MIBlockSet &other)
- : function(other.function)
- {
- if (other.blockFlags)
- blockFlags = new Flags(*other.blockFlags);
- blockNumbers = other.blockNumbers;
- }
-
- MIBlockSet &operator=(const MIBlockSet &other)
- {
- if (blockFlags) {
- delete blockFlags;
- blockFlags = nullptr;
- }
- function = other.function;
- if (other.blockFlags)
- blockFlags = new Flags(*other.blockFlags);
- blockNumbers = other.blockNumbers;
- return *this;
- }
-
- MIBlockSet &operator=(MIBlockSet &&other) noexcept
- {
- if (&other != this) {
- std::swap(blockNumbers, other.blockNumbers);
-
- delete blockFlags;
- blockFlags = other.blockFlags;
- other.blockFlags = nullptr;
-
- function = other.function;
- }
- return *this;
- }
-
- ~MIBlockSet()
- {
- delete blockFlags;
- }
-
- void init(MIFunction *f)
- {
- Q_ASSERT(!function);
- Q_ASSERT(f);
- function = f;
- }
-
- bool empty() const;
-
- void insert(MIBlock *bb)
- {
- Q_ASSERT(function);
-
- if (blockFlags) {
- blockFlags->setBit(bb->index());
- return;
- }
-
- for (unsigned int blockNumber : qAsConst(blockNumbers)) {
- if (blockNumber == bb->index())
- return;
- }
-
- if (blockNumbers.size() == MaxVectorCapacity) {
- blockFlags = new Flags(int(function->blockCount()), false);
- for (unsigned int blockNumber : qAsConst(blockNumbers)) {
- blockFlags->setBit(int(blockNumber));
- }
- blockNumbers.clear();
- blockFlags->setBit(int(bb->index()));
- } else {
- blockNumbers.append(bb->index());
- }
- }
-
- void remove(MIBlock *bb)
- {
- Q_ASSERT(function);
-
- if (blockFlags) {
- blockFlags->clearBit(bb->index());
- return;
- }
-
- for (int i = 0; i < blockNumbers.size(); ++i) {
- if (blockNumbers[i] == bb->index()) {
- blockNumbers.remove(i);
- return;
- }
- }
- }
-
- const_iterator begin() const;
- const_iterator end() const;
-
- void collectValues(std::vector<MIBlock *> &bbs) const;
-
- bool contains(MIBlock *bb) const
- {
- Q_ASSERT(function);
-
- if (blockFlags)
- return blockFlags->at(bb->index());
-
- for (unsigned int blockNumber : blockNumbers) {
- if (blockNumber == bb->index())
- return true;
- }
-
- return false;
- }
-};
-
-class MIBlockSet::const_iterator
-{
- const MIBlockSet &set;
- // ### These two members could go into a union, but clang won't compile
- // (https://codereview.qt-project.org/#change,74259)
- QVarLengthArray<MIBlock::Index, 8>::const_iterator numberIt;
- MIBlock::Index flagIt;
-
- friend class MIBlockSet;
- const_iterator(const MIBlockSet &set, bool end)
- : set(set)
- {
- if (end || !set.function) {
- if (!set.blockFlags)
- numberIt = set.blockNumbers.end();
- else
- flagIt = set.blockFlags->size();
- } else {
- if (!set.blockFlags)
- numberIt = set.blockNumbers.begin();
- else
- findNextWithFlags(0);
- }
- }
-
- void findNextWithFlags(int start)
- {
- flagIt = MIBlock::Index(set.blockFlags->findNext(start, true, /*wrapAround = */false));
- Q_ASSERT(flagIt <= MIBlock::Index(set.blockFlags->size()));
- }
-
-public:
- MIBlock *operator*() const
- {
- if (!set.blockFlags)
- return set.function->block(*numberIt);
-
- Q_ASSERT(flagIt <= set.function->blockCount());
- return set.function->block(flagIt);
-
- }
-
- bool operator==(const const_iterator &other) const
- {
- if (&set != &other.set)
- return false;
- if (!set.blockFlags)
- return numberIt == other.numberIt;
- return flagIt == other.flagIt;
- }
-
- bool operator!=(const const_iterator &other) const
- { return !(*this == other); }
-
- const_iterator &operator++()
- {
- if (!set.blockFlags)
- ++numberIt;
- else
- findNextWithFlags(flagIt + 1);
-
- return *this;
- }
-};
-
-inline bool MIBlockSet::empty() const
-{ return begin() == end(); }
-
-inline MIBlockSet::const_iterator MIBlockSet::begin() const
-{ return const_iterator(*this, false); }
-
-inline MIBlockSet::const_iterator MIBlockSet::end() const
-{ return const_iterator(*this, true); }
-
-inline void MIBlockSet::collectValues(std::vector<MIBlock *> &bbs) const
-{
- Q_ASSERT(function);
-
- for (auto it : *this)
- bbs.push_back(it);
-}
-
-} // namespace IR
-} // namespace QV4
-
-QT_END_NAMESPACE
-
-#endif // QV4MIBLOCKSET_P_H
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