--- /dev/null
+/****************************************************************************
+**
+** 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 "qv4identifier_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_UInt)
+ 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_UInt)
+ 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
struct IdentifierTable
{
ExecutionEngine *engine;
- QHash<QString, String *> identifiers;
-public:
- IdentifierTable(ExecutionEngine *engine) : engine(engine) {}
+ int alloc;
+ int size;
+ int numBits;
+ String **entries;
- String *insert(const QString &s)
- {
- QHash<QString, String*>::const_iterator it = identifiers.find(s);
- if (it != identifiers.constEnd())
- return it.value();
+ void addEntry(String *str);
- String *str = engine->newString(s);
- str->createHashValue();
- if (str->subtype == String::StringType_ArrayIndex)
- return str;
+public:
- str->identifier = new Identifier;
- str->identifier->string = str->toQString();
- str->identifier->hashValue = str->hashValue();
- identifiers.insert(s, str);
+ IdentifierTable(ExecutionEngine *engine);
+ ~IdentifierTable();
- return str;
- }
+ String *insertString(const QString &s);
- void toIdentifier(String *str) {
- if (str->identifier)
- return;
- if (str->subtype == String::StringType_Unknown)
- str->createHashValue();
- if (str->subtype == String::StringType_ArrayIndex)
- return;
- QHash<QString, String*>::const_iterator it = identifiers.find(str->toQString());
- if (it != identifiers.constEnd()) {
- str->identifier = (*it)->identifier;
- return;
- }
- str->identifier = new Identifier;
- str->identifier->string = str->toQString();
- str->identifier->hashValue = str->hashValue();
- identifiers.insert(str->toQString(), str);
- }
+ Identifier *identifier(String *str);
+ Identifier *identifier(const QString &s);
+ Identifier *identifier(const char *s, int len);
void mark() {
- for (QHash<QString, String *>::const_iterator it = identifiers.constBegin(); it != identifiers.constEnd(); ++it)
- (*it)->mark();
+ for (uint i = 0; i < alloc; ++i)
+ if (entries[i])
+ entries[i]->mark();
}
};
projects / platform / upstream / qtdeclarative.git / commitdiff