internal override void Emit(EmitContext ec)
{
ILGenerator ig = ec.ig;
bool varStm = lhs is VariableStatement;
object var = null;
if (varStm)
{
VariableStatement stm = (VariableStatement)lhs;
ig.Emit(OpCodes.Ldnull);
var = TypeManager.Get(((VariableDeclaration)stm.var_decls [0]).id);
set_builder(ig, var);
}
if (obj != null)
{
obj.Emit(ec);
}
CodeGenerator.load_engine(InFunction, ig);
Type convert = typeof(Convert);
ig.Emit(OpCodes.Call, convert.GetMethod("ToForInObject"));
ig.Emit(OpCodes.Call, typeof(ForIn).GetMethod("JScriptGetEnumerator"));
Type ienumerator = typeof(IEnumerator);
LocalBuilder iter = ig.DeclareLocal(ienumerator);
LocalBuilder current = ig.DeclareLocal(typeof(object));
ig.Emit(OpCodes.Stloc, iter);
Label init_loop = ig.DefineLabel();
Label move_next = ig.DefineLabel();
Label exit = ig.DefineLabel();
ig.Emit(OpCodes.Br, move_next);
ig.MarkLabel(init_loop);
if (body != null)
{
body.Emit(ec);
}
ig.MarkLabel(move_next);
ig.Emit(OpCodes.Ldloc, iter);
ig.Emit(OpCodes.Callvirt, ienumerator.GetMethod("MoveNext"));
ig.Emit(OpCodes.Brfalse, exit);
ig.Emit(OpCodes.Ldloc, iter);
ig.Emit(OpCodes.Callvirt, ienumerator.GetProperty("Current").GetGetMethod());
ig.Emit(OpCodes.Stloc, current);
ig.Emit(OpCodes.Ldloc, current);
if (varStm)
{
set_builder(ig, var);
}
else
{
if (lhs is Expression)
{
AST ast = ((Expression)lhs).Last;
if (ast is Identifier)
{
((Identifier)ast).EmitStore(ec);
}
else
{
throw new NotImplementedException();
}
}
else
{
throw new NotImplementedException();
}
}
ig.Emit(OpCodes.Br, init_loop);
ig.MarkLabel(exit);
}