V4: Clean up the runtime functions declarations

The declarations and usage of runtime functions have seen a number of
changes:
- we don't use the array of method pointers anymore because we don't use
  cross-platform AOT JITting
- the check if a method can throw a JS exception was invalid, and was
  not used anymore
- value-pointer vs. const-value-ref was inconsistent

This patch cleans that up. By fixing the exception checking, we can now
use it in the baseline JIT to automatically insert those checks. To make
that work correctly, all runtime methods are in a struct, which gets
annotated to indicate if that method throws. (The old way of checking
which type of engine was used is fragile: some non-throwing methods
do not take an engine parameter at all, and those got flagged as
throwing). By using a struct, we can also get rid of a bunch of
interesting macros.

The flags in the struct (as mentioned above) can later be extended to
capture more information, e.g. if a method will change the context.

Change-Id: I1e0b9ba62a0bf538eb728b4378e2678136e29a64
Reviewed-by: Lars Knoll <lars.knoll@qt.io>

1 files changed, 3 insertions, 2 deletions

diff --git a/src/qml/jsruntime/qv4context_p.h b/src/qml/jsruntime/qv4context_p.h
index 5cd2f9ddf0..75fa2d08e6 100644
--- a/src/qml/jsruntime/qv4context_p.h
+++ b/src/qml/jsruntime/qv4context_p.h
@@ -150,9 +150,10 @@ struct Q_QML_EXPORT ExecutionContext : public Managed
     V4_INTERNALCLASS(ExecutionContext)
 
     static Heap::CallContext *newBlockContext(QV4::CppStackFrame *frame, int blockIndex);
-    static Heap::CallContext *cloneBlockContext(Heap::CallContext *context);
+    static Heap::CallContext *cloneBlockContext(ExecutionEngine *engine,
+                                                Heap::CallContext *callContext);
     static Heap::CallContext *newCallContext(QV4::CppStackFrame *frame);
-    Heap::ExecutionContext *newWithContext(Heap::Object *with);
+    Heap::ExecutionContext *newWithContext(Heap::Object *with) const;
     static Heap::ExecutionContext *newCatchContext(CppStackFrame *frame, int blockIndex, Heap::String *exceptionVarName);
 
     void createMutableBinding(String *name, bool deletable);