Switch over to new JS call setup

Differences:
- push parameters on the stack, including space for CallData members
- call instructions calculate the argument start
- use temp space above the calldata to evaluate arguments
- fewer temporaries are needed when a call is done while generating the
  arguments of another call
- when calling the function, the js stack space above the callData is
  not used, allowing for optimizations in the future
- Array and ObjectLiteral use the same mechanism

Change-Id: Id100fa06f12cc9d941b0f90b0b81b8270a8e4f5d
Reviewed-by: Erik Verbruggen <erik.verbruggen@qt.io>
Reviewed-by: Lars Knoll <lars.knoll@qt.io>

1 files changed, 2 insertions, 0 deletions

diff --git a/src/qml/jsruntime/qv4context_p.h b/src/qml/jsruntime/qv4context_p.h
index a854c324d0..5cf134bc70 100644
--- a/src/qml/jsruntime/qv4context_p.h
+++ b/src/qml/jsruntime/qv4context_p.h
@@ -92,6 +92,8 @@ struct CallData
 
     Value thisObject;
     Value args[1];
+
+    static constexpr int HeaderSize() { return offsetof(CallData, args)/sizeof(QV4::Value); }
 };
 
 Q_STATIC_ASSERT(std::is_standard_layout<CallData>::value);