Turn Identifier into a simple integer

Add a reverse mapping table to the IdentifierHash to
avoid having to store a hash value inside the identifier.
This makes it possible to then use the identifiers value
based and not new them on the heap anymore.

Change-Id: If1f177588ea104565c6e3add49c70534a6c7dcb8
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>

1 files changed, 3 insertions, 2 deletions

diff --git a/src/qml/jsruntime/qv4identifiertable_p.h b/src/qml/jsruntime/qv4identifiertable_p.h
index 2210a866fb..0c8de01f71 100644
--- a/src/qml/jsruntime/qv4identifiertable_p.h
+++ b/src/qml/jsruntime/qv4identifiertable_p.h
@@ -66,7 +66,8 @@ struct IdentifierTable
     int alloc;
     int size;
     int numBits;
-    Heap::String **entries;
+    Heap::String **entriesByHash;
+    Heap::String **entriesById;
 
     void addEntry(Heap::String *str);
 
@@ -95,7 +96,7 @@ public:
 
     void mark(MarkStack *markStack) {
         for (int i = 0; i < alloc; ++i) {
-            Heap::String *entry = entries[i];
+            Heap::String *entry = entriesByHash[i];
             if (!entry || entry->isMarked())
                 continue;
             entry->setMarkBit();