Add instructions to simplify for-of loops

Added an IteratorNext instruction to fetch the next
iteration value (empty if the iterator is done).

This will also help to implement array destructuring without
requiring huge amounts of byte code.

Change-Id: If96c1e81471e5e2b0b7b2af122238d87741aa371
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>

1 files changed, 5 insertions, 0 deletions

diff --git a/src/qml/jsruntime/qv4engine_p.h b/src/qml/jsruntime/qv4engine_p.h
index e8218d0d1c..46bf58de07 100644
--- a/src/qml/jsruntime/qv4engine_p.h
+++ b/src/qml/jsruntime/qv4engine_p.h
@@ -327,6 +327,9 @@ public:
         String_byteOffset,
         String_buffer,
         String_lastIndex,
+        String_next,
+        String_done,
+
         NJSStrings
     };
     Value *jsStrings;
@@ -384,6 +387,8 @@ public:
     String *id_byteOffset() const { return reinterpret_cast<String *>(jsStrings + String_byteOffset); }
     String *id_buffer() const { return reinterpret_cast<String *>(jsStrings + String_buffer); }
     String *id_lastIndex() const { return reinterpret_cast<String *>(jsStrings + String_lastIndex); }
+    String *id_next() const { return reinterpret_cast<String *>(jsStrings + String_next); }
+    String *id_done() const { return reinterpret_cast<String *>(jsStrings + String_done); }
 
     Symbol *symbol_hasInstance() const { return reinterpret_cast<Symbol *>(jsSymbols + Symbol_hasInstance); }
     Symbol *symbol_isConcatSpreadable() const { return reinterpret_cast<Symbol *>(jsSymbols + Symbol_isConcatSpreadable); }