Added support for generator functions and yield expressions to the AST

Some smaller changes to the codegen are included as well to ensure
that we catch all uses of generators and properly throw an unimplemented
error on them for now.

Change-Id: Ib915a0e862e128644ff00dfe989507783c912c66
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>

1 files changed, 10 insertions, 0 deletions

diff --git a/src/qml/compiler/qv4codegen.cpp b/src/qml/compiler/qv4codegen.cpp
index 0033383189..d72162eeb1 100644
--- a/src/qml/compiler/qv4codegen.cpp
+++ b/src/qml/compiler/qv4codegen.cpp
@@ -2260,6 +2260,12 @@ bool Codegen::visit(FunctionDeclaration * ast)
     return false;
 }
 
+bool Codegen::visit(YieldExpression *ast)
+{
+    throwSyntaxError(ast->firstSourceLocation(), QLatin1String("Support for 'yield' unimplemented."));
+    return false;
+}
+
 static bool endsWithReturn(Node *node)
 {
     if (!node)
@@ -2288,6 +2294,10 @@ int Codegen::defineFunction(const QString &name, AST::Node *ast,
 {
     enterContext(ast);
 
+    if (_context->isGenerator) {
+        throwSyntaxError(ast->firstSourceLocation(), QLatin1String("Support for generator functions unimplemented."));
+    }
+
     if (_context->functionIndex >= 0)
         // already defined
         return leaveContext();