1 files changed, 184 insertions, 0 deletions
diff --git a/src/qml/jsruntime/qv4identifiertable.cpp b/src/qml/jsruntime/qv4identifiertable.cpp
new file mode 100644
index 0000000000..5de2f893ef
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+++ b/src/qml/jsruntime/qv4identifiertable.cpp
@@ -0,0 +1,184 @@
+/****************************************************************************
+**
+** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/legal
+**
+** 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 Digia.  For licensing terms and
+** conditions see http://qt.digia.com/licensing.  For further information
+** use the contact form at http://qt.digia.com/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 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Digia gives you certain additional
+** rights.  These rights are described in the Digia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+#include "qv4identifiertable_p.h"
+
+QT_BEGIN_NAMESPACE
+
+namespace QV4 {
+
+static const uchar prime_deltas[] = {
+    0,  0,  1,  3,  1,  5,  3,  3,  1,  9,  7,  5,  3,  9, 25,  3,
+    1, 21,  3, 21,  7, 15,  9,  5,  3, 29, 15,  0,  0,  0,  0,  0
+};
+
+static inline int primeForNumBits(int numBits)
+{
+    return (1 << numBits) + prime_deltas[numBits];
+}
+
+
+IdentifierTable::IdentifierTable(ExecutionEngine *engine)
+    : engine(engine)
+    , size(0)
+    , numBits(8)
+{
+    alloc = primeForNumBits(numBits);
+    entries = (String **)malloc(alloc*sizeof(String *));
+    memset(entries, 0, alloc*sizeof(String *));
+}
+
+IdentifierTable::~IdentifierTable()
+{
+    free(entries);
+}
+
+void IdentifierTable::addEntry(String *str)
+{
+    uint hash = str->hashValue();
+
+    if (str->subtype == String::StringType_ArrayIndex)
+        return;
+
+    str->identifier = new Identifier;
+    str->identifier->string = str->toQString();
+    str->identifier->hashValue = hash;
+
+    bool grow = (alloc <= size*2);
+
+    if (grow) {
+        ++numBits;
+        int newAlloc = primeForNumBits(numBits);
+        String **newEntries = (String **)malloc(newAlloc*sizeof(String *));
+        memset(newEntries, 0, newAlloc*sizeof(String *));
+        for (uint i = 0; i < alloc; ++i) {
+            String *e = entries[i];
+            if (!e)
+                continue;
+            uint idx = e->stringHash % newAlloc;
+            while (newEntries[idx]) {
+                ++idx;
+                idx %= newAlloc;
+            }
+            newEntries[idx] = e;
+        }
+        free(entries);
+        entries = newEntries;
+        alloc = newAlloc;
+    }
+
+    uint idx = hash % alloc;
+    while (entries[idx]) {
+        ++idx;
+        idx %= alloc;
+    }
+    entries[idx] = str;
+    ++size;
+}
+
+
+
+String *IdentifierTable::insertString(const QString &s)
+{
+    uint hash = String::createHashValue(s.constData(), s.length());
+    uint idx = hash % alloc;
+    while (String *e = entries[idx]) {
+        if (e->stringHash == hash && e->toQString() == s)
+            return e;
+        ++idx;
+        idx %= alloc;
+    }
+
+    String *str = engine->newString(s);
+    addEntry(str);
+    return str;
+}
+
+
+Identifier *IdentifierTable::identifier(String *str)
+{
+    if (str->identifier)
+        return str->identifier;
+    uint hash = str->hashValue();
+    if (str->subtype == String::StringType_ArrayIndex)
+        return 0;
+
+    uint idx = hash % alloc;
+    while (String *e = entries[idx]) {
+        if (e->stringHash == hash && e->isEqualTo(str)) {
+            str->identifier = e->identifier;
+            return e->identifier;
+        }
+        ++idx;
+        idx %= alloc;
+    }
+
+    addEntry(str);
+    return str->identifier;
+}
+
+Identifier *IdentifierTable::identifier(const QString &s)
+{
+    return insertString(s)->identifier;
+}
+
+Identifier *IdentifierTable::identifier(const char *s, int len)
+{
+    uint hash = String::createHashValue(s, len);
+    if (hash == UINT_MAX)
+        return identifier(QString::fromUtf8(s, len));
+
+    QLatin1String latin(s, len);
+    uint idx = hash % alloc;
+    while (String *e = entries[idx]) {
+        if (e->stringHash == hash && e->toQString() == latin)
+            return e->identifier;
+        ++idx;
+        idx %= alloc;
+    }
+
+    String *str = engine->newString(QString::fromLatin1(s, len));
+    addEntry(str);
+    return str->identifier;
+}
+
+}
+
+QT_END_NAMESPACE