Move the memory pool into the common code

We need it in both, the compiler and the runtime.

Change-Id: Iffacb9d150bf9eef6ef477bfd427dbac9bf49359
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>

3 files changed, 322 insertions, 1 deletions

diff --git a/src/qml/common/common.pri b/src/qml/common/common.pri
index de95772120..9de4fcae16 100644
--- a/src/qml/common/common.pri
+++ b/src/qml/common/common.pri
@@ -1,3 +1,5 @@
 HEADERS += \
     $$PWD/qqmlapiversion_p.h \
-    $$PWD/qqmljsdiagnosticmessage_p.h
+    $$PWD/qqmljsdiagnosticmessage_p.h \
+    $$PWD/qqmljsfixedpoolarray_p.h \
+    $$PWD/qqmljsmemorypool_p.h
diff --git a/src/qml/common/qqmljsfixedpoolarray_p.h b/src/qml/common/qqmljsfixedpoolarray_p.h
new file mode 100644
index 0000000000..b65b994d6c
--- /dev/null
+++ b/src/qml/common/qqmljsfixedpoolarray_p.h
@@ -0,0 +1,140 @@
+/****************************************************************************
+**
+** Copyright (C) 2016 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 QQMLJSFIXEDPOOLARRAY_P_H
+#define QQMLJSFIXEDPOOLARRAY_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 <QtCore/qglobal.h>
+#include <private/qqmljsmemorypool_p.h>
+
+QT_BEGIN_NAMESPACE
+
+namespace QQmlJS {
+
+template <typename T>
+class FixedPoolArray
+{
+    T *data;
+    int count = 0;
+
+public:
+    FixedPoolArray()
+        : data(nullptr)
+    {}
+
+    FixedPoolArray(MemoryPool *pool, int size)
+    { allocate(pool, size); }
+
+    void allocate(MemoryPool *pool, int size)
+    {
+        count = size;
+        data = reinterpret_cast<T*>(pool->allocate(count * sizeof(T)));
+    }
+
+    void allocate(MemoryPool *pool, const QVector<T> &vector)
+    {
+        count = vector.count();
+        data = reinterpret_cast<T*>(pool->allocate(count * sizeof(T)));
+
+        if (QTypeInfo<T>::isComplex) {
+            for (int i = 0; i < count; ++i)
+                new (data + i) T(vector.at(i));
+        } else {
+            memcpy(data, static_cast<const void*>(vector.constData()), count * sizeof(T));
+        }
+    }
+
+    template <typename Container>
+    void allocate(MemoryPool *pool, const Container &container)
+    {
+        count = container.count();
+        data = reinterpret_cast<T*>(pool->allocate(count * sizeof(T)));
+        typename Container::ConstIterator it = container.constBegin();
+        for (int i = 0; i < count; ++i)
+            new (data + i) T(*it++);
+    }
+
+    int size() const
+    { return count; }
+
+    const T &at(int index) const {
+        Q_ASSERT(index >= 0 && index < count);
+        return data[index];
+    }
+
+    T &at(int index) {
+        Q_ASSERT(index >= 0 && index < count);
+        return data[index];
+    }
+
+    T &operator[](int index) {
+        return at(index);
+    }
+
+
+    int indexOf(const T &value) const {
+        for (int i = 0; i < count; ++i)
+            if (data[i] == value)
+                return i;
+        return -1;
+    }
+
+    const T *begin() const { return data; }
+    const T *end() const { return data + count; }
+
+    T *begin() { return data; }
+    T *end() { return data + count; }
+};
+
+} // namespace QQmlJS
+
+QT_END_NAMESPACE
+
+#endif // QQMLJSFIXEDPOOLARRAY_P_H
diff --git a/src/qml/common/qqmljsmemorypool_p.h b/src/qml/common/qqmljsmemorypool_p.h
new file mode 100644
index 0000000000..0cf7ea84e6
--- /dev/null
+++ b/src/qml/common/qqmljsmemorypool_p.h
@@ -0,0 +1,179 @@
+/****************************************************************************
+**
+** Copyright (C) 2016 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 QQMLJSMEMORYPOOL_P_H
+#define QQMLJSMEMORYPOOL_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 <QtCore/qglobal.h>
+#include <QtCore/qshareddata.h>
+#include <QtCore/qdebug.h>
+
+#include <cstring>
+
+QT_BEGIN_NAMESPACE
+
+namespace QQmlJS {
+
+class Managed;
+
+class MemoryPool : public QSharedData
+{
+    MemoryPool(const MemoryPool &other);
+    void operator =(const MemoryPool &other);
+
+public:
+    MemoryPool() {}
+
+    ~MemoryPool()
+    {
+        if (_blocks) {
+            for (int i = 0; i < _allocatedBlocks; ++i) {
+                if (char *b = _blocks[i])
+                    free(b);
+            }
+
+            free(_blocks);
+        }
+        qDeleteAll(strings);
+    }
+
+    inline void *allocate(size_t size)
+    {
+        size = (size + 7) & ~size_t(7);
+        if (Q_LIKELY(_ptr && (_ptr + size < _end))) {
+            void *addr = _ptr;
+            _ptr += size;
+            return addr;
+        }
+        return allocate_helper(size);
+    }
+
+    void reset()
+    {
+        _blockCount = -1;
+        _ptr = _end = nullptr;
+    }
+
+    template <typename Tp> Tp *New() { return new (this->allocate(sizeof(Tp))) Tp(); }
+    template <typename Tp, typename... Ta> Tp *New(Ta... args)
+    { return new (this->allocate(sizeof(Tp))) Tp(args...); }
+
+    QStringRef newString(const QString &string) {
+        strings.append(new QString(string));
+        return QStringRef(strings.last());
+    }
+
+private:
+    Q_NEVER_INLINE void *allocate_helper(size_t size)
+    {
+        size_t currentBlockSize = DEFAULT_BLOCK_SIZE;
+        while (Q_UNLIKELY(size >= currentBlockSize))
+            currentBlockSize *= 2;
+
+        if (++_blockCount == _allocatedBlocks) {
+            if (! _allocatedBlocks)
+                _allocatedBlocks = DEFAULT_BLOCK_COUNT;
+            else
+                _allocatedBlocks *= 2;
+
+            _blocks = reinterpret_cast<char **>(realloc(_blocks, sizeof(char *) * size_t(_allocatedBlocks)));
+            Q_CHECK_PTR(_blocks);
+
+            for (int index = _blockCount; index < _allocatedBlocks; ++index)
+                _blocks[index] = nullptr;
+        }
+
+        char *&block = _blocks[_blockCount];
+
+        if (! block) {
+            block = reinterpret_cast<char *>(malloc(currentBlockSize));
+            Q_CHECK_PTR(block);
+        }
+
+        _ptr = block;
+        _end = _ptr + currentBlockSize;
+
+        void *addr = _ptr;
+        _ptr += size;
+        return addr;
+    }
+
+private:
+    char **_blocks = nullptr;
+    int _allocatedBlocks = 0;
+    int _blockCount = -1;
+    char *_ptr = nullptr;
+    char *_end = nullptr;
+    QVector<QString*> strings;
+
+    enum
+    {
+        DEFAULT_BLOCK_SIZE = 8 * 1024,
+        DEFAULT_BLOCK_COUNT = 8
+    };
+};
+
+class Managed
+{
+    Q_DISABLE_COPY(Managed)
+public:
+    Managed() = default;
+    ~Managed() = default;
+
+    void *operator new(size_t size, MemoryPool *pool) { return pool->allocate(size); }
+    void operator delete(void *) {}
+    void operator delete(void *, MemoryPool *) {}
+};
+
+} // namespace QQmlJS
+
+QT_END_NAMESPACE
+
+#endif