Changeset 2794 in webkit for trunk/JavaScriptCore/kjs/property_map.cpp

Timestamp:

Nov 20, 2002, 5:28:08 PM (23 years ago)

Author:

darin

Message:

• added a feature for Richard to use in his back/forward cache

• kjs/object.h: Added save/restoreProperties.
• kjs/property_map.h: Here too.
• kjs/property_map.cpp: Here too.

File:

• trunk/JavaScriptCore/kjs/property_map.cpp (modified) (2 diffs)

trunk/JavaScriptCore/kjs/property_map.cpp

@@ -26 +26 @@
 #include "reference_list.h"
 
-// At the time I added this, the optimization still gave a 1.5% performance boost.
+// At the time I added this switch, the optimization still gave a 1.5% performance boost so I couldn't remove it.
 #define USE_SINGLE_ENTRY 1
 
 namespace KJS {
+
+class SavedProperty {
+public:
+    Identifier key;
+    Value value;
+};
 
 // Algorithm concepts from Algorithms in C++, Sedgewick.
@@ -282 +288 @@
 }
 
+void PropertyMap::save(SavedProperties &p) const
+{
+    int count = 0;
+
+#if USE_SINGLE_ENTRY
+    if (_singleEntry.key)
+        ++count;
+#endif
+    for (int i = 0; i != _tableSize; ++i)
+        if (_table[i].key && _table[i].attributes == 0)
+            ++count;
+
+    delete [] p._properties;
+    if (count == 0) {
+        p._properties = 0;
+        return;
+    }
+    p._properties = new SavedProperty [count];
+    
+    SavedProperty *prop = p._properties;
+    
+#if USE_SINGLE_ENTRY
+    if (_singleEntry.key) {
+        prop->key = Identifier(_singleEntry.key);
+        prop->value = Value(_singleEntry.value);
+        ++prop;
+    }
+#endif
+    for (int i = 0; i != _tableSize; ++i)
+        if (_table[i].key && _table[i].attributes == 0) {
+            prop->key = Identifier(_table[i].key);
+            prop->value = Value(_table[i].value);
+        }
+}
+
+void PropertyMap::restore(const SavedProperties &p)
+{
+    for (int i = 0; i != p._count; ++i)
+        put(p._properties[i].key, p._properties[i].value.imp(), 0);
+}
+
 } // namespace KJS