JavaScriptCore-521.tar.gz

[apple/javascriptcore.git] / runtime / ArgList.cpp

diff --git a/runtime/ArgList.cpp b/runtime/ArgList.cpp
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+/*
+ *  Copyright (C) 2003, 2004, 2005, 2006, 2007 Apple Inc. All rights reserved.
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Library General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2 of the License, or (at your option) any later version.
+ *
+ *  This library is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  Library General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Library General Public License
+ *  along with this library; see the file COPYING.LIB.  If not, write to
+ *  the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ *  Boston, MA 02110-1301, USA.
+ *
+ */
+
+#include "config.h"
+#include "ArgList.h"
+
+#include "JSValue.h"
+#include "JSCell.h"
+
+using std::min;
+
+namespace JSC {
+
+void ArgList::getSlice(int startIndex, ArgList& result) const
+{
+    ASSERT(!result.m_isReadOnly);
+
+    const_iterator start = min(begin() + startIndex, end());
+    result.m_vector.appendRange(start, end());
+    result.m_size = result.m_vector.size();
+    result.m_buffer = result.m_vector.data();
+}
+
+void ArgList::markLists(ListSet& markSet)
+{
+    ListSet::iterator end = markSet.end();
+    for (ListSet::iterator it = markSet.begin(); it != end; ++it) {
+        ArgList* list = *it;
+
+        iterator end2 = list->end();
+        for (iterator it2 = list->begin(); it2 != end2; ++it2)
+            if (!(*it2).marked())
+                (*it2).mark();
+    }
+}
+
+void ArgList::slowAppend(JSValuePtr v)
+{
+    // As long as our size stays within our Vector's inline 
+    // capacity, all our values are allocated on the stack, and 
+    // therefore don't need explicit marking. Once our size exceeds
+    // our Vector's inline capacity, though, our values move to the 
+    // heap, where they do need explicit marking.
+    if (!m_markSet) {
+        // We can only register for explicit marking once we know which heap
+        // is the current one, i.e., when a non-immediate value is appended.
+        if (Heap* heap = Heap::heap(v)) {
+            ListSet& markSet = heap->markListSet();
+            markSet.add(this);
+            m_markSet = &markSet;
+        }
+    }
+
+    if (m_vector.size() < m_vector.capacity()) {
+        m_vector.uncheckedAppend(v);
+        return;
+    }
+
+    // 4x growth would be excessive for a normal vector, but it's OK for Lists 
+    // because they're short-lived.
+    m_vector.reserveCapacity(m_vector.capacity() * 4);
+    
+    m_vector.uncheckedAppend(v);
+    m_buffer = m_vector.data();
+}
+
+} // namespace JSC