Author: Stephan <[email protected]>
Branch: 
Changeset: r187:255df334ee16
Date: 2012-05-12 20:40 +0200
http://bitbucket.org/pypy/lang-js/changeset/255df334ee16/

Log:    wip

diff --git a/js/astbuilder.py b/js/astbuilder.py
--- a/js/astbuilder.py
+++ b/js/astbuilder.py
@@ -8,98 +8,12 @@
 def _get_root_map():
     return ROOT_MAP
 
-#class Scope(object):
-#    _immutable_fields_ = ['local_variables']
-#    def __init__(self):
-#        self.local_variables = ROOT_MAP
-#        self.declared_variables = []
-#
-#    def __repr__(self):
-#        return '%s: %s; %s' % (object.__repr__(self), 
repr(self.local_variables), repr(self.declared_variables))
-#
-#    def add_local(self, identifier):
-#        if not self.is_local(identifier):
-#            self.local_variables = self.local_variables.add(identifier)
-#
-#    def declare_local(self, identifier):
-#        if not self.is_local(identifier):
-#            self.add_local(identifier)
-#            if not identifier in self.declared_variables:
-#                self.declared_variables.append(identifier)
-#
-#    def is_local(self, identifier):
-#        return self.local_variables.lookup(identifier) != 
self.local_variables.NOT_FOUND
-#
-#    def get_local(self, identifier):
-#        idx = self.local_variables.lookup(identifier)
-#        if idx == self.local_variables.NOT_FOUND:
-#            raise ValueError
-#        return idx
-
-#class GlobalScope(Scope):
-#    def add_local(self, identifier):
-#        pass
-#
-#    def declare_local(self, identifier):
-#        if not identifier in self.declared_variables:
-#            self.declared_variables.append(identifier)
-#
-#    def is_local(self, identifier):
-#        return False
-#
-#    def get_local(self, identifier):
-#        raise ValueError
-#
-#class EvalScope(GlobalScope):
-#    def declare_local(self, identifier):
-#        pass
-
-#class Scopes(object):
-#    def __init__(self):
-#        self._scopes = []
-#        self._scopes.append(GlobalScope())
-#
-#    def current_scope(self):
-#        if not self._scopes:
-#            return None
-#        else:
-#            return self._scopes[-1]
-#
-#    def new_scope(self):
-#        self._scopes.append(Scope())
-#
-#    def end_scope(self):
-#        self._scopes.pop()
-#
-#    def declarations(self):
-#        if self.scope_present():
-#            return self.current_scope().declared_variables
-#        else:
-#            return []
-#
-#    def is_local(self, identifier):
-#        return self.scope_present() == True and 
self.current_scope().is_local(identifier) == True
-#
-#    def scope_present(self):
-#        return self.current_scope() is not None
-#
-#    def add_local(self, identifier):
-#        if self.scope_present():
-#            self.current_scope().add_local(identifier)
-#
-#    def declare_local(self, identifier):
-#        if self.scope_present():
-#            self.current_scope().declare_local(identifier)
-#
-#    def get_local(self, identifier):
-#        return self.current_scope().get_local(identifier)
-
 class SymbolMap(object):
     def __init__(self):
-        self.functions = {}
-        self.variables = {}
         self.symbols = {}
-        self.parameters = {}
+        self.functions = []
+        self.variables = []
+        self.parameters = []
         self.next_index = 0
 
     def add_symbol(self, identifyer):
@@ -113,21 +27,21 @@
         idx = self.add_symbol(identifyer)
 
         if identifyer not in self.variables:
-            self.variables[identifyer] = idx
+            self.variables.append(identifyer)
         return idx
 
     def add_function(self, identifyer):
         idx = self.add_symbol(identifyer)
 
         if identifyer not in self.functions:
-            self.functions[identifyer] = idx
+            self.functions.append(identifyer)
         return idx
 
     def add_parameter(self, identifyer):
         idx = self.add_symbol(identifyer)
 
         if identifyer not in self.parameters:
-            self.parameters[identifyer] = idx
+            self.parameters.append(identifyer)
         return idx
 
     def get_index(self, identifyer):
@@ -232,10 +146,10 @@
         #print 'closing scope, returning to %d' % (self.depth, )
 
     def current_scope_variables(self):
-        return self.current_scope().variables.keys()
+        return self.current_scope().variables
 
     def current_scope_parameters(self):
-        return self.current_scope().parameters.keys()
+        return self.current_scope().parameters
 
     def current_scope(self):
         try:
diff --git a/js/bench/v8/v1/run.js b/js/bench/v8/v1/run.js
--- a/js/bench/v8/v1/run.js
+++ b/js/bench/v8/v1/run.js
@@ -28,9 +28,9 @@
 
 load('base.js');
 load('looping.js');
-load('richards.js');
-load('deltablue.js');
-load('crypto.js');
+//load('richards.js');
+//load('deltablue.js');
+//load('crypto.js');
 //load('raytrace.js');
 //load('earley-boyer.js');
 
diff --git a/js/builtins.py b/js/builtins.py
--- a/js/builtins.py
+++ b/js/builtins.py
@@ -1,7 +1,5 @@
 from js.jsobj import w_Undefined, W_IntNumber, w_Null, W_Boolean,\
-     W_FloatNumber, W_String, newbool,\
-     isnull_or_undefined, W_Number,\
-     DONT_DELETE, DONT_ENUM, READ_ONLY, INTERNAL, _w
+     W_FloatNumber, W_String, newbool, isnull_or_undefined, W_Number, _w
 from js.execution import ThrowException, JsTypeError
 
 from js.jsparser import parse, ParseError
@@ -13,167 +11,9 @@
 from pypy.rlib.rarithmetic import r_uint
 from pypy.rlib.rfloat import NAN, INFINITY
 from pypy.rlib.objectmodel import we_are_translated
-from pypy.rlib.streamio import open_file_as_stream
 
 from pypy.rlib import jit
 
[email protected]_look_inside
-def eval_source(script_source, sourcename):
-    temp_tree = parse(script_source)
-    builder = make_eval_ast_builder()
-    return builder.dispatch(temp_tree)
-
[email protected]_look_inside
-def load_source(script_source, sourcename):
-    temp_tree = parse(script_source)
-    builder = make_ast_builder()
-    return builder.dispatch(temp_tree)
-
-def load_file(filename):
-    f = open_file_as_stream(filename)
-    t = load_source(f.readall(), filename)
-    f.close()
-    return t
-
-def make_loadjs(interp):
-    def f(this, args):
-        filename = str(args[0].ToString())
-        t = load_file(filename)
-        interp.run(t)
-        return w_Undefined
-    return f
-
-# 15.1.2.1
-from js.jsobj import W_BasicFunction
-class W__Eval(W_BasicFunction):
-    def ToString(self):
-        return "function eval() { [native code] }"
-
-    def Call(self, args=[], this=None):
-        if len(args) == 0:
-            return w_Undefined
-
-        arg0 = args[0]
-        if  not isinstance(arg0, W_String):
-            return arg0
-
-        src = arg0.ToString()
-        try:
-            node = eval_source(src, 'evalcode')
-        except ParseError, e:
-            raise ThrowException(W_String('SyntaxError: '+str(e)))
-
-        bytecode = JsCode()
-        node.emit(bytecode)
-        func = bytecode.make_js_function()
-        return func.run(self._context_)
-
-#class W_HasOwnProperty(W_NewBuiltin):
-    #def Call(self, args=[], this=None):
-        #if len(args) >= 1:
-            #propname = args[0].ToString()
-            #if propname in self._get_property_keys():
-                #return newbool(True)
-        #return newbool(False)
-
-#class W_IsPrototypeOf(W_NewBuiltin):
-    #def Call(self, args=[], this=None):
-        #w_obj = args[0]
-        #if len(args) >= 1 and isinstance(w_obj, W_PrimitiveObject):
-            #O = this
-            #assert isinstance(w_obj, W_PrimitiveObject)
-            #V = w_obj.Prototype
-            #while V is not None:
-                #if O == V:
-                    #return newbool(True)
-                #assert isinstance(V, W_PrimitiveObject)
-                #V = V.Prototype
-        #return newbool(False)
-
-#class W_PropertyIsEnumerable(W_NewBuiltin):
-    #def Call(self, args=[], this=None):
-        #if len(args) >= 1:
-            #propname = args[0].ToString()
-            #if self._has_property(propname) and not 
self._get_property_flags(propname) & DONT_ENUM:
-                #return newbool(True)
-        #return newbool(False)
-
-#class W_Function(W_NewBuiltin):
-    #def __init__(self, ctx, Prototype=None, Class='function', 
Value=w_Undefined):
-        #W_NewBuiltin.__init__(self, Prototype, Class, Value)
-        #self.ctx = ctx
-
-    #def Call(self, args=[], this=None):
-        #tam = len(args)
-        #if tam >= 1:
-            #fbody  = args[tam-1].ToString()
-            #argslist = []
-            #for i in range(tam-1):
-                #argslist.append(args[i].ToString())
-            #fargs = ','.join(argslist)
-            #functioncode = "function (%s) {%s}"%(fargs, fbody)
-        #else:
-            #functioncode = "function () {}"
-        ##remove program and sourcelements node
-        #funcnode = parse(functioncode).children[0].children[0]
-        #builder = make_ast_builder()
-        #ast = builder.dispatch(funcnode)
-        #bytecode = JsCode()
-        #ast.emit(bytecode)
-        #func = bytecode.make_js_function()
-        #return func.run(self.ctx)
-
-    #def Construct(self, args=[]):
-        #return self.Call(args, this=None)
-
-#functionstring= 'function (arguments go here!) {\n'+ \
-                #'    [lots of stuff :)]\n'+ \
-                #'}'
-#class W_FToString(W_NewBuiltin):
-    #def Call(self, args=[], this=None):
-        #from js.jsobj import W__Function
-        #if isinstance(this, W_PrimitiveObject):
-            #if this.Class == 'Function':
-                #return W_String(functionstring)
-        #if isinstance(this, W__Function):
-            #return W_String(functionstring)
-
-        #raise JsTypeError('this is not a function object')
-
-#class W_ValueToString(W_NewBuiltin):
-    #"this is the toString function for objects with Value"
-    #mytype = ''
-    #def Call(self, args=[], this=None):
-        #assert isinstance(this, W_PrimitiveObject)
-        #if this.Value.type() != self.mytype:
-            #raise JsTypeError('Wrong type')
-        #return W_String(this.Value.ToString())
-
-#class W_NumberValueToString(W_ValueToString):
-    #mytype = 'number'
-
-#class W_BooleanValueToString(W_ValueToString):
-    #mytype = 'boolean'
-
-#class W_StringValueToString(W_ValueToString):
-    #mytype = 'string'
-
-#class W_NativeObject(W_Object):
-    #def __init__(self, Class, Prototype, Value=w_Undefined):
-        #W_Object.__init__(self, Prototype, Class, Value)
-
-#@specialize.memo()
-#def get_value_of(type):
-    #class W_ValueValueOf(W_NewBuiltin):
-        #"this is the valueOf function for objects with Value"
-        #def Call(self, args=[], this=None):
-            #assert isinstance(this, W_PrimitiveObject)
-            #if type != this.Class:
-                #raise JsTypeError('%s.prototype.valueOf called with 
incompatible type' % self.type())
-            #return this.Value
-    #return W_ValueValueOf
-
-
 class Sorter(TimSort):
     def __init__(self, list, listlength=None, compare_fn=None):
         TimSort.__init__(self, list, listlength)
@@ -185,83 +25,6 @@
             return result == -1
         return a.ToString() < b.ToString()
 
-#class W_ObjectObject(W_NativeObject):
-    #def __init__(self, Class, Prototype, Value=w_Undefined):
-        #W_NativeObject.__init__(self, Class, Prototype, Value)
-
-    #def Call(self, args=[], this=None):
-        #if len(args) >= 1 and not isnull_or_undefined(args[0]):
-            #return args[0].ToObject()
-        #else:
-            #return self.Construct()
-
-    #def Construct(self, args=[]):
-        #if (len(args) >= 1 and not args[0] is w_Undefined and not args[0] is 
w_Null):
-            ## XXX later we could separate builtins and normal objects
-            #return args[0].ToObject()
-        #return create_object('Object')
-
-#class W_BooleanObject(W_NativeObject):
-    #def Call(self, args=[], this=None):
-        #if len(args) >= 1 and not isnull_or_undefined(args[0]):
-            #return newbool(args[0].ToBoolean())
-        #else:
-            #return newbool(False)
-
-    #def Construct(self, args=[]):
-        #if len(args) >= 1 and not isnull_or_undefined(args[0]):
-            #Value = newbool(args[0].ToBoolean())
-            #return create_object('Boolean', Value = Value)
-        #return create_object('Boolean', Value = newbool(False))
-
-#class W_NumberObject(W_NativeObject):
-    #def Call(self, args=[], this=None):
-        #if len(args) >= 1 and not isnull_or_undefined(args[0]):
-            #return W_FloatNumber(args[0].ToNumber())
-        #elif len(args) >= 1 and args[0] is w_Undefined:
-            #return W_FloatNumber(NAN)
-        #else:
-            #return W_FloatNumber(0.0)
-
-    #def ToNumber(self):
-        #return 0.0
-
-    #def Construct(self, args=[]):
-        #if len(args) >= 1 and not isnull_or_undefined(args[0]):
-            #Value = W_FloatNumber(args[0].ToNumber())
-            #return create_object('Number', Value = Value)
-        #return create_object('Number', Value = W_FloatNumber(0.0))
-
-#class W_StringObject(W_NativeObject):
-    #length = 1
-    #def Call(self, args=[], this=None):
-        #if len(args) >= 1:
-            #return W_String(args[0].ToString())
-        #else:
-            #return W_String('')
-
-    #def Construct(self, args=[]):
-        #if len(args) >= 1:
-            #Value = W_String(args[0].ToString())
-        #else:
-            #Value = W_String('')
-        #return Value.ToObject()
-
-#class W_ArrayObject(W_NativeObject):
-    #def __init__(self, Class, Prototype):
-        #W_NativeObject.__init__(self, Class, Prototype, None )
-
-    #def Call(self, args=[], this=None):
-        #if len(args) == 1 and isinstance(args[0], W_Number):
-            #array = create_array()
-            #array.Put('length', args[0])
-        #else:
-            #array = create_array(args)
-        #return array
-
-    #def Construct(self, args=[]):
-        #return self.Call(args)
-
 def new_native_function(function, name = None):
     from js.functions import JsNativeFunction
     from js.jsobj import W__Function
@@ -276,24 +39,25 @@
         return _w(func(*args))
     return f
 
+def put_native_function(obj, name, func, writable = False, configurable = 
False, enumerable = False):
+    jsfunc = new_native_function(func, name)
+    put_property(obj, name, jsfunc, writable = writable, configurable = 
configurable, enumerable = enumerable)
+
+def put_intimate_function(obj, name, func, writable = False, configurable = 
False, enumerable = False):
+    from js.functions import JsIntimateFunction
+    from js.jsobj import W__Function
+
+    scope = None
+    jsfunc = JsIntimateFunction(native_function(func), name)
+    w_func = W__Function(jsfunc)
+    put_property(obj, name, w_func, writable = writable, configurable = 
configurable, enumerable = enumerable)
+
+# 15
+def put_property(obj, name, value, writable = True, configurable = False, 
enumerable = True):
+    from js.jsobj import put_property as _put_property
+    _put_property(obj, name, value, writable, configurable, enumerable)
+
 def setup_builtins(global_object):
-    def put_native_function(obj, name, func, writable = False, configurable = 
False, enumerable = False):
-        jsfunc = new_native_function(func, name)
-        put_property(obj, name, jsfunc, writable = writable, configurable = 
configurable, enumerable = enumerable)
-
-    def put_intimate_function(obj, name, func, writable = False, configurable 
= False, enumerable = False):
-        from js.functions import JsIntimateFunction
-        from js.jsobj import W__Function
-
-        scope = None
-        jsfunc = JsIntimateFunction(native_function(func), name)
-        w_func = W__Function(jsfunc)
-        put_property(obj, name, w_func, writable = writable, configurable = 
configurable, enumerable = enumerable)
-
-    # 15
-    def put_property(obj, name, value, writable = True, configurable = False, 
enumerable = True):
-        from js.jsobj import put_property as _put_property
-        _put_property(obj, name, value, writable, configurable, enumerable)
 
     # Forward declaration
     # 15.2.3
@@ -321,9 +85,10 @@
     w_FunctionPrototype._prototype_ = w_ObjectPrototype
 
     # initial prototype
-    from js.jsobj import W__Object, W__Function
+    from js.jsobj import W__Object, W__Function, W_BasicFunction
     W__Object._prototype_ = w_ObjectPrototype
     W__Function._prototype_ = w_FunctionPrototype
+    W_BasicFunction._prototype_ = w_FunctionPrototype
 
     # 15.2 Object Objects
     # 15.2.3 Properties of the Object Constructor
@@ -379,6 +144,7 @@
     from js.jsobj import W_BooleanObject
     w_BooleanPrototype = W_BooleanObject(False)
     w_BooleanPrototype._prototype_ = W__Object._prototype_
+    put_property(w_BooleanPrototype, '__proto__', 
w_BooleanPrototype._prototype_, writable = False, enumerable = False, 
configurable = False)
 
     # 15.6.3.1
     put_property(w_Boolean, 'prototype', w_BooleanPrototype, writable = False, 
enumerable = False, configurable = False)
@@ -616,4 +382,4 @@
         put_native_function(global_object, 'pypy_repr', 
global_builtins.pypy_repr)
         put_native_function(global_object, 'inspect', global_builtins.inspect)
 
-    #put_native_function(global_object, 'load', make_loadjs(interp))
+    put_intimate_function(global_object, 'load', global_builtins.js_load)
diff --git a/js/builtins_array.py b/js/builtins_array.py
--- a/js/builtins_array.py
+++ b/js/builtins_array.py
@@ -3,17 +3,17 @@
 # 15.4.4.7
 def push(this, args):
     o = this.ToObject()
-    lenVal = o.Get('length')
-    n = lenVal.ToUInt32()
+    len_val = o.get('length')
+    n = len_val.ToUInt32()
 
     for item in args:
         e = item
-        o.Put(str(n), e)
+        o.put(str(n), e, True)
         n = n + 1
 
-    o.set_length(n)
+    o.put('length', _w(n), True)
 
-    return o
+    return n
 
 # 15.4.4.2
 def to_string(this, args):
@@ -60,24 +60,24 @@
 # 15.4.4.6
 def pop(this, args):
     o = this.ToObject()
-    lenVal = o.Get('length')
+    lenVal = o.get('length')
     l = lenVal.ToUInt32()
 
     if l == 0:
-        o.Put('length', _w(0))
+        o.put('length', _w(0))
         return w_Undefined
     else:
         indx = l - 1
         indxs = str(indx)
-        element = o.Get(indxs)
-        o.Delete(indxs)
-        o.Put('length', _w(indx))
+        element = o.get(indxs)
+        o.delete(indxs, True)
+        o.put('length', _w(indx))
         return element
 
 # 15.4.4.8
 def reverse(this, args):
     o = this.ToObject()
-    length = o.Get('length').ToUInt32()
+    length = o.ret('length').ToUInt32()
 
     import math
     middle = math.floor(length/2)
@@ -87,20 +87,20 @@
         upper = length - lower - 1
         lowerP = str(lower)
         upperP = str(upper)
-        lowerValue = o.Get(lowerP)
-        upperValue = o.Get(upperP)
+        lowerValue = o.ret(lowerP)
+        upperValue = o.ret(upperP)
         lowerExists = o.HasProperty(lowerP)
         upperExists = o.HasProperty(upperP)
 
         if lowerExists is True and upperExists is True:
-            o.Put(lowerP, upperValue)
-            o.Put(upperP, lowerValue)
+            o.put(lowerP, upperValue)
+            o.put(upperP, lowerValue)
         elif lowerExists is False and upperExists is True:
-            o.Put(lowerP, upperValue)
-            o.Delete(upperP)
+            o.put(lowerP, upperValue)
+            o.delete(upperP)
         elif lowerExists is True and upperExists is False:
-            o.Delete(lowerP)
-            o.Put(upperP, lowerValue)
+            o.delete(lowerP)
+            o.put(upperP, lowerValue)
 
         lower = lower + 1
 
diff --git a/js/builtins_boolean.py b/js/builtins_boolean.py
--- a/js/builtins_boolean.py
+++ b/js/builtins_boolean.py
@@ -1,6 +1,26 @@
+from js.jsobj import W_Boolean, W_BooleanObject
+from js.execution import JsTypeError
+
 # 15.6.4.2
 def to_string(this, args):
-    return this.to_string()
+    if isinstance(this, W_Boolean):
+        b = this
+    elif isinstance(this, W_BooleanObject):
+        b = this.PrimitiveValue()
+    else:
+        raise JsTypeError()
+
+    if b.ToBoolean() == True:
+        return 'true'
+    else:
+        return 'false'
 
 def value_of(this, args):
+    if isinstance(this, W_Boolean):
+        b = this
+    elif isinstance(this, W_BooleanObject):
+        b = this.PrimitiveValue()
+    else:
+        raise JsTypeError()
+
     return this.ToBoolean()
diff --git a/js/builtins_function.py b/js/builtins_function.py
--- a/js/builtins_function.py
+++ b/js/builtins_function.py
@@ -1,7 +1,12 @@
 from js.jsobj import isnull_or_undefined
 
 def to_string(this, args):
-    return this.to_string()
+    from js.jsobj import W_BasicFunction
+    if not isinstance(this, W_BasicFunction):
+        from js.execution import JsTypeError
+        raise JsTypeError()
+
+    return this._to_string_()
 
 def empty(this, args):
     from js.jsobj import w_Undefined
@@ -9,7 +14,7 @@
 
 # 15.3.4.4 Function.prototype.call
 def call(this, args):
-    pass
+    raise NotImplementedError()
     #if len(args) >= 1:
         #if isnull_or_undefined(args[0]):
             #thisArg = this.ctx.get_global()
@@ -23,7 +28,7 @@
 
 # 15.3.4.3 Function.prototype.apply (thisArg, argArray)
 def apply(this, args):
-    pass
+    raise NotImplementedError()
     #try:
         #if isnull_or_undefined(args[0]):
             #thisArg = this.ctx.get_global()
diff --git a/js/builtins_global.py b/js/builtins_global.py
--- a/js/builtins_global.py
+++ b/js/builtins_global.py
@@ -120,3 +120,21 @@
     ctx = EvalExecutionContext(f, calling_context = calling_context)
     res = f.run(ctx)
     return _w(res)
+
+def js_load(ctx):
+    from js.interpreter import load_file
+    from js.jscode import ast_to_bytecode
+    from js.functions import JsEvalCode
+    from js.execution_context import EvalExecutionContext
+
+    args = ctx.argv()
+    filename = args[0].to_string()
+
+    ast = load_file(filename)
+    symbol_map = ast.symbol_map
+    code = ast_to_bytecode(ast, symbol_map)
+
+    f = JsEvalCode(code)
+    calling_context = ctx._calling_context_
+    ctx = EvalExecutionContext(f, calling_context = calling_context)
+    f.run(ctx)
diff --git a/js/execution_context.py b/js/execution_context.py
--- a/js/execution_context.py
+++ b/js/execution_context.py
@@ -177,7 +177,7 @@
 
         if strict:
             self._this_binding_ = this
-        elif isnull_or_undefined(this):
+        elif this is None or isnull_or_undefined(this):
             self._this_binding_ = get_global_object()
         elif this.klass() is not 'Object':
             self._this_binding_ = this.ToObject()
diff --git a/js/interpreter.py b/js/interpreter.py
--- a/js/interpreter.py
+++ b/js/interpreter.py
@@ -1,17 +1,25 @@
-from js.astbuilder import make_ast_builder, make_eval_ast_builder
 from js.jscode import JsCode
 
 from pypy.rlib.objectmodel import we_are_translated
+from pypy.rlib.streamio import open_file_as_stream
 
 import js.builtins
 
-TEST = False
+def load_file(filename):
+    from js.astbuilder import parse_to_ast
 
-def load_source(script_source, sourcename):
-    return js.builtins.load_source(script_source, sourcename)
+    f = open_file_as_stream(filename)
+    src = f.readall()
+    ast = parse_to_ast(src)
+    f.close()
+    return ast
 
-def load_file(filename):
-    return js.builtins.load_file(filename)
+def add_interpreter_builtins(global_object):
+    from js.builtins import new_native_function, native_function, 
put_native_function
+    def trace(this, args):
+        import pdb; pdb.set_trace()
+
+    put_native_function(global_object, 'trace', trace)
 
 class Interpreter(object):
     """Creates a js interpreter"""
@@ -20,6 +28,7 @@
         self.global_object = W_BasicObject()
         from js.builtins import setup_builtins
         setup_builtins(self.global_object)
+        add_interpreter_builtins(self.global_object)
 
     def run_ast(self, ast):
         symbol_map = ast.symbol_map
diff --git a/js/js_interactive.py b/js/js_interactive.py
--- a/js/js_interactive.py
+++ b/js/js_interactive.py
@@ -6,7 +6,7 @@
 
 import sys
 import getopt
-from js.interpreter import load_source, Interpreter, load_file
+from js.interpreter import Interpreter, load_file
 from js.jsparser import parse, ParseError
 from js.jsobj import W_String, w_Undefined, W_Boolean
 from pypy.rlib.streamio import open_file_as_stream
@@ -79,7 +79,7 @@
                     #print repr(res)
                 print res.to_string()
             except JsException, exc:
-                print exc.exception.to_string()
+                self.showtraceback(exc)
         except SystemExit:
             raise
         except JsException, exc:
@@ -89,6 +89,7 @@
                 print
 
     def runsource(self, source, filename="<input>"):
+        from js.astbuilder import parse_to_ast
         """Parse and run source in the interpreter.
 
         One of these cases can happen:
@@ -97,7 +98,7 @@
         3) The input is complete. Executes the source code.
         """
         try:
-            ast = load_source(source, filename)
+            ast = parse_to_ast(str(source))
         except ParseError, exc:
             if exc.source_pos.i == len(source):
                 # Case 2
@@ -113,7 +114,7 @@
 
     def showtraceback(self, exc):
         # XXX format exceptions nicier
-        print exc.exception.to_string()
+        print exc.value.to_string()
 
     def showsyntaxerror(self, filename, exc):
         # XXX format syntax errors nicier
diff --git a/js/jscode.py b/js/jscode.py
--- a/js/jscode.py
+++ b/js/jscode.py
@@ -41,10 +41,10 @@
         self._symbols = symbol_map
 
     def variables(self):
-        return self._symbols.variables.keys()
+        return self._symbols.variables
 
     def functions(self):
-        return self._symbols.functions.keys()
+        return self._symbols.functions
 
     def index_for_symbol(self, symbol):
         return self._symbols.get_index(symbol)
@@ -56,7 +56,7 @@
         return self._symbols.get_symbol(index)
 
     def params(self):
-        return self._symbols.parameters.keys()
+        return self._symbols.parameters
 
     @jit.elidable
     def estimated_stack_size(self):
@@ -161,14 +161,13 @@
 
     def to_function_opcodes(self):
         self.unlabel()
-        self.unpop_or_undefined()
+        #self.unpop_or_undefined()
+        self.emit('LOAD_UNDEFINED')
         return self.opcodes
 
     def to_global_opcodes(self):
-        #import pdb; pdb.set_trace()
         self.unlabel()
         self.unpop_or_undefined()
-        #self.unpop()
         return self.opcodes
 
     def to_executable_opcodes(self):
diff --git a/js/jsobj.py b/js/jsobj.py
--- a/js/jsobj.py
+++ b/js/jsobj.py
@@ -45,6 +45,12 @@
     def ToInteger(self):
         return int(self.ToNumber())
 
+    def ToInt32(self):
+        return r_int32(self.ToInteger())
+
+    def ToUInt32(self):
+        return r_uint32(self.ToInteger())
+
     def is_callable(self):
         return False
 
@@ -305,7 +311,7 @@
     def put(self, p, v, throw = False):
         if self.can_put(p) is False:
             if throw is True:
-                raise JsTypeError(self.__class__)
+                raise JsTypeError()
 
         own_desc = self.get_own_property(p)
         if is_data_descriptor(own_desc):
@@ -371,7 +377,9 @@
             return True
 
         if throw is True:
-            raise JsTypeError(self.__class__)
+            raise JsTypeError()
+
+        return False
 
     # 8.12.8
     def default_value(self, hint = 'Number'):
@@ -387,7 +395,8 @@
         if res is not None:
             return res
 
-        raise JsTypeError(self.__class__)
+        import pdb; pdb.set_trace()
+        raise JsTypeError()
 
     def _default_value_string_(self):
         to_string = self.get('toString')
@@ -407,7 +416,7 @@
     def define_own_property(self, p, desc, throw = False):
         def reject():
             if throw:
-                raise JsTypeError(self.__class__)
+                raise JsTypeError()
             else:
                 return False
 
@@ -470,7 +479,7 @@
             else:
                 raise NotImplementedError(self.__class__)
         # 10
-        elif is_data_descriptor(current) and is_data_descriptor(current):
+        elif is_data_descriptor(current) and is_data_descriptor(desc):
             # 10.a
             if current.configurable is False:
                 # 10.a.i
@@ -548,12 +557,7 @@
     _class_ = 'Date'
 
 class W__Object(W_BasicObject):
-    def to_string(self):
-        try:
-            res = self.ToPrimitive('String')
-        except JsTypeError:
-            return "[object %s]" % (self.klass() ,)
-        return res.to_string()
+    pass
 
 class W_ObjectConstructor(W_BasicObject):
     def __init__(self):
@@ -584,7 +588,7 @@
         W_BasicObject.__init__(self)
 
     def Call(self, args = [], this = None, calling_context = None):
-        raise NotImplementedError(self.__class__)
+        raise NotImplementedError("abstract")
 
     # 13.2.2
     def Construct(self, args=[]):
@@ -597,7 +601,6 @@
             # but I fail to find a case that falls into this
             obj._prototype_ = W__Object._prototype_
 
-
         result = self.Call(args, this=obj)
         if isinstance(result, W__Object):
             return result
@@ -607,8 +610,11 @@
     def is_callable(self):
         return True
 
+    def _to_string_(self):
+        return 'function() {}'
+
 class W_FunctionConstructor(W_BasicFunction):
-    def to_string(self):
+    def _to_string_(self):
         return "function Function() { [native code] }"
 
     # 15.3.2.1
@@ -667,6 +673,9 @@
     def Construct(self, args=[]):
         return self.Call(args).ToObject()
 
+    def _to_string_(self):
+        return "function Number() { [native code] }"
+
 # 15.5.2
 class W_StringConstructor(W_BasicFunction):
     def Call(self, args = [], this = None, calling_context = None):
@@ -678,6 +687,9 @@
     def Construct(self, args=[]):
         return self.Call(args).ToObject()
 
+    def _to_string_(self):
+        return "function String() { [native code] }"
+
 # 15.6.2
 class W_BooleanConstructor(W_BasicFunction):
     def Call(self, args = [], this = None, calling_context = None):
@@ -689,6 +701,9 @@
     def Construct(self, args=[]):
         return self.Call(args).ToObject()
 
+    def _to_string_(self):
+        return "function Boolean() { [native code] }"
+
 # 15.9.2
 class W_DateConstructor(W_BasicFunction):
     def Call(self, args=[], this=None):
@@ -699,6 +714,9 @@
     def Construct(self, args=[]):
         return self.Call(args).ToObject()
 
+    def _to_string_(self):
+        return "function Date() { [native code] }"
+
 
 class W__Function(W_BasicFunction):
     #_immutable_fields_ = ['_function_']
@@ -725,6 +743,9 @@
         if strict is True:
             raise NotImplementedError()
 
+    def _to_string(self):
+        return self._function_.to_string()
+
     def code(self):
         return self._function_
 
@@ -766,10 +787,6 @@
     def is_strict(self):
         return self._strict_
 
-class W_Eval(W_BasicFunction):
-    def Call(self, args = [], this = None, calling_context = None):
-        raise NotImplementedError()
-
 # 10.6
 class W_Arguments(W_BasicObject):
     _class_ = 'Arguments'
@@ -874,7 +891,7 @@
 
         old_len_desc = self.get_own_property('length')
         assert old_len_desc is not w_Undefined
-        old_len = old_len_desc.value
+        old_len = old_len_desc.value.ToUInt32()
 
         # 3
         if p == 'length':
@@ -932,7 +949,7 @@
         # 4
         elif is_array_index(p):
             # a
-            index = p.ToUInt32()
+            index = r_uint32(int(p))
             # b
             if index >= old_len and old_len_desc.writable is False:
                 return reject()
@@ -954,7 +971,12 @@
         return W_BasicObject.define_own_property(self, p, desc, throw)
 
 def is_array_index(p):
-    return (isinstance(p, W_Number) or isinstance(p, W_NumericObject)) and 
str(p.ToUInt32()) == p
+    try:
+        return str(r_uint32(int(p))) == p
+    except ValueError:
+        return False
+
+    #return (isinstance(p, W_Number) or isinstance(p, W_NumericObject)) and 
str(p.ToUInt32()) == p
 
     #def set_length(self, newlength):
         #if newlength < self.length:
@@ -1084,12 +1106,6 @@
             return False
         return bool(num)
 
-    def ToInt32(self):
-        return r_int32(self.ToInteger())
-
-    def ToUInt32(self):
-        return r_uint32(self.ToInteger())
-
     def __eq__(self, other):
         if isinstance(other, W_Number):
             return self.ToNumber() == other.ToNumber()
diff --git a/js/opcodes.py b/js/opcodes.py
--- a/js/opcodes.py
+++ b/js/opcodes.py
@@ -134,7 +134,11 @@
         from js.jsobj import W__Array
         array = W__Array()
         for i in range(self.counter):
-            array.Put(str(self.counter - i - 1), ctx.stack_pop())
+            el = ctx.stack_pop()
+            index = str(self.counter - i - 1)
+            array.put(index, el)
+        length = self.counter
+        array.put('length', _w(length))
         ctx.stack_append(array)
 
     def stack_change(self):
@@ -225,7 +229,7 @@
 class TYPEOF(BaseUnaryOperation):
     def eval(self, ctx):
         var = ctx.stack_pop()
-        ctx.stack_append(W_String(one.type()))
+        ctx.stack_append(W_String(var.type()))
 
 class TYPEOF_VARIABLE(Opcode):
     def __init__(self, index, name):
@@ -359,9 +363,13 @@
     def eval(self, ctx):
         left = ctx.stack_pop()
         member = ctx.stack_pop()
+        name = member.to_string()
+
         value = ctx.stack_pop()
-        name = member.to_string()
-        left.ToObject().put(name, value)
+
+        l_obj = left.ToObject()
+        l_obj.put(name, value)
+
         ctx.stack_append(value)
 
 class STORE(Opcode):
@@ -589,12 +597,8 @@
 def commonnew(ctx, obj, args):
     from js.jsobj import W_BasicObject
     if not isinstance(obj, W_BasicObject):
-        raise ThrowException(W_String('it is not a constructor'))
-    try:
-        res = obj.Construct(args=args)
-        return res
-    except JsTypeError:
-        raise ThrowException(W_String('it is not a constructor'))
+        raise JsTypeError('it is not a constructor')
+    res = obj.Construct(args=args)
     return res
 
 class NEW(Opcode):
@@ -605,13 +609,15 @@
         from js.jsobj import W_List
         assert isinstance(y, W_List)
         args = y.to_list()
-        ctx.stack_append(commonnew(ctx, x, args))
+        res = commonnew(ctx, x, args)
+        ctx.stack_append(res)
 
 class NEW_NO_ARGS(Opcode):
     _stack_change = 0
     def eval(self, ctx):
         x = ctx.stack_pop()
-        ctx.stack_append(commonnew(ctx, x, []))
+        res = commonnew(ctx, x, [])
+        ctx.stack_append(res)
 
 # ------------ iterator support ----------------
 
diff --git a/js/test/ecma/conftest.py b/js/test/ecma/conftest.py
--- a/js/test/ecma/conftest.py
+++ b/js/test/ecma/conftest.py
@@ -1,4 +1,13 @@
 import pytest
+import py
+
+from _pytest.runner import Failed
+from js.interpreter import Interpreter, load_file
+from js.jsobj import _w
+from js import interpreter
+from js.execution import JsException
+from pypy.rlib.parsing.parsing import ParseError
+
 
 exclusionlist = ['shell.js', 'browser.js']
 #passing_tests = ['Number', 'Boolean', 'Array']
@@ -17,95 +26,73 @@
            help="run js interpreter ecma tests"
     )
 
-import py
-
-from _pytest.runner import Failed
-from js.interpreter import Interpreter, load_file
-from js.jsobj import _w
-from js import interpreter
-from js.execution import JsBaseExcept
-from pypy.rlib.parsing.parsing import ParseError
-
-interpreter.TEST = True
-
 rootdir = py.path.local(__file__).dirpath()
 
-
 class JSTestFile(pytest.File):
     def __init__(self, fspath, parent=None, config=None, session=None):
         super(JSTestFile, self).__init__(fspath, parent, config, session)
         self.name = self.fspath.purebasename
 
+
     def collect(self):
         if self.session.config.getvalue("ecma") is not True:
             pytest.skip("ECMA tests disabled, run with --ecma")
 
+        interp = Interpreter()
 
-        self.init_interp()
+        # the tests expect eval to return "error" on an exception
+        from js.builtins import put_intimate_function
+        def overriden_eval(ctx):
+            from js.builtins_global import js_eval
+            from js.execution import JsException
+            try:
+                return js_eval(ctx)
+            except JsException:
+                return "error"
+
+        global_object = interp.global_object
+        del(global_object._properties_['eval'])
+        put_intimate_function(global_object, 'eval', overriden_eval, 
configurable = False)
+
+        shellpath = rootdir/'shell.js'
+        shellfile = load_file(str(shellpath))
+        interp.run_ast(shellfile)
+
         #actually run the file :)
         t = load_file(str(self.fspath))
         try:
-            self.interp.run(t)
+            interp.run_ast(t)
         except ParseError, e:
             raise Failed(msg=e.nice_error_message(filename=str(self.fspath))) 
#, excinfo=None)
-        except JsBaseExcept, e:
-            raise Failed(msg="Javascript Error: "+str(e)) #, 
excinfo=py.code.ExceptionInfo())
-        except:
-            raise
-        ctx = self.interp.global_context
-        testcases = ctx.resolve_identifier('testcases')
-        self.tc = ctx.resolve_identifier('tc')
-        testcount = testcases.Get('length').ToInt32()
+        #except JsException, e:
+            #import pdb; pdb.set_trace()
+            #raise Failed(msg="Javascript Error: "+str(e)) #, 
excinfo=py.code.ExceptionInfo())
+
+        testcases = global_object.get('testcases')
+        #tc = global_object.get('tc')
+        #self.tc = tc
+        testcount = testcases.get('length').ToInt32()
         self.testcases = testcases
 
+        run_test_func = global_object.get('run_test')
+        def get_result(test_num):
+            w_test_number = _w(test_num)
+            result = run_test_func.Call(args = [w_test_number])
+            return result.to_string()
+
         for number in xrange(testcount):
-            yield JSTestItem(str(number), parent=self)
-
-    def init_interp(cls):
-        if hasattr(cls, 'interp'):
-            from js.jsobj import W__Array
-            cls.testcases.PutValue(W__Array(), cls.interp.global_context)
-            cls.tc.PutValue(_w(0), cls.interp.global_context)
-
-        cls.interp = Interpreter()
-        shellpath = rootdir/'shell.js'
-        if not hasattr(cls, 'shellfile'):
-            cls.shellfile = load_file(str(shellpath))
-        cls.interp.run(cls.shellfile)
-        cls.testcases = 
cls.interp.global_context.resolve_identifier('testcases')
-        cls.tc = cls.interp.global_context.resolve_identifier('tc')
-
-        # override eval
-        from js.builtins import new_native_function
-
-        ctx = cls.interp.global_context
-        def overriden_evaljs(this, args):
-            from js.builtins import W__Eval
-            try:
-                w_eval = W__Eval(ctx)
-                return w_eval.Call(args, this)
-            except JsBaseExcept:
-                return "error"
-
-        cls.interp.w_Global.Put('eval', new_native_function(ctx, 
overriden_evaljs, 'eval'))
-
-#
-#    init_interp = classmethod(init_interp)
-#
-#
-#
+            result = get_result(number)
+            yield JSTestItem(str(number), result, parent=self)
 
 class JSTestItem(pytest.Item):
-    def __init__(self, name, parent=None, config=None, session=None):
+    def __init__(self, name, result, parent=None, config=None, session=None):
         super(JSTestItem, self).__init__(name, parent, config, session)
         self.test_number = int(name)
         self.name = parent.name + '.' + name
+        self.result = result
 
     def runtest(self):
-        ctx = self.parent.interp.global_context
-        r3 = ctx.resolve_identifier('run_test')
-        w_test_number = _w(self.test_number)
-        result = r3.Call([w_test_number]).ToString()
+        result = self.result
         __tracebackhide__ = True
         if result != "passed":
             raise JsTestException(self, result)
@@ -119,9 +106,6 @@
             ])
 
     _handling_traceback = False
-#    def _getpathlineno(self):
-#        return self.parent.parent.fspath, 0
-#
 
 class JsTestException(Exception):
     def __init__(self, item, result):
diff --git a/js/test/test_array.py b/js/test/test_array.py
--- a/js/test/test_array.py
+++ b/js/test/test_array.py
@@ -11,3 +11,9 @@
     assertv("var x = [4,3,2,1]; x.pop();", 1)
     assertv("var x = [4,3,2,1]; x.pop(); x.pop(); x.pop(); x.pop();", 4)
     assertv("var x = [4,3,2,1]; x.pop(); x.pop(); x.pop(); x.pop(); x.length", 
0)
+
+def test_array_length():
+    assertv("var x = []; x.length;", 0)
+    assertv("var x = [1,2,3]; x.length;", 3);
+    assertv("var x = []; x[0] = 1; x[1] = 2; x[2] = 3; x.length;", 3);
+    assertv("var x = []; x[2] = 3; x.length;", 3);
diff --git a/js/test/test_execution_context.py 
b/js/test/test_execution_context.py
--- a/js/test/test_execution_context.py
+++ b/js/test/test_execution_context.py
@@ -1,3 +1,2 @@
 import py
 
-from js.jscode import FunctionExecutionContext
diff --git a/js/test/test_interp.py b/js/test/test_interp.py
--- a/js/test/test_interp.py
+++ b/js/test/test_interp.py
@@ -949,3 +949,22 @@
 
 def test_empty_function_with_params():
     assertv("x = function(x) { }; x(); false", False)
+
+def test_params_order(capsys):
+    assertp("function f(a, b, c, d) { return print([a, b, c, d]) }; 
f(1,2,3,4)", "1,2,3,4", capsys);
+    assertp("function f(z, y, x, w) { return print([z, y, x, w]) }; 
f(1,2,3,4)", "1,2,3,4", capsys);
+    assertp("function f(n, d, e, a) { return print([n, d, e, a]) }; 
f(1,2,3,4)", "1,2,3,4", capsys);
+
+def test_function_without_implicit_return_value():
+    assertv("""
+    function f(a) {
+        if(a != null)
+            if(true) this.foo(a);
+    }
+    f(null);
+    1;
+    """, 1)
+
+def test_boolean_constructor():
+    assertv("typeof Boolean(true)", 'boolean')
+    assertv("typeof new Boolean(true)", 'object')
diff --git a/js/test/test_jscode.py b/js/test/test_jscode.py
--- a/js/test/test_jscode.py
+++ b/js/test/test_jscode.py
@@ -45,24 +45,3 @@
 #
 #        ctx = make_global_context()
 #        assert nf.run(ctx, [_w(1), _w(2)]).ToInteger() == 3
-
-class TestJs_Function(object):
-    #def test_run(self):
-        #from js.builtins import load_source
-        #from js.jscode import JsCode
-        #from js.jsexecution_context import make_global_context
-        #from js.jsobj import _w
-
-        #code = """
-        #function f(a, b) {
-            #return a + b;
-        #}
-        #"""
-
-        #bytecode = JsCode()
-        #load_source(code, '').emit(bytecode)
-
-        #f = bytecode.ToJsFunction()
-        #ctx = make_global_context()
-
-        #assert f.run(ctx, [_w(1), _w(2)]).ToInteger() == 3
diff --git a/js/test/test_locals.py b/js/test/test_locals.py
--- a/js/test/test_locals.py
+++ b/js/test/test_locals.py
@@ -1,52 +1,52 @@
 import py
 
-from js.astbuilder import Scopes
+#from js.astbuilder import Scopes
 
-def test_scopes_is_local():
-    scopes = Scopes()
+#def test_scopes_is_local():
+    #scopes = Scopes()
 
-    scopes.new_scope()
-    assert scopes.is_local('a') is False
-    scopes.add_local('a')
-    assert scopes.is_local('a') is True
-    assert scopes.is_local('b') is False
-    scopes.add_local('b')
-    assert scopes.is_local('b') is True
+    #scopes.new_scope()
+    #assert scopes.is_local('a') is False
+    #scopes.add_local('a')
+    #assert scopes.is_local('a') is True
+    #assert scopes.is_local('b') is False
+    #scopes.add_local('b')
+    #assert scopes.is_local('b') is True
 
-    scopes.new_scope()
-    assert scopes.is_local('a') is False
-    scopes.add_local('a')
-    assert scopes.is_local('a') is True
-    assert scopes.is_local('b') is False
+    #scopes.new_scope()
+    #assert scopes.is_local('a') is False
+    #scopes.add_local('a')
+    #assert scopes.is_local('a') is True
+    #assert scopes.is_local('b') is False
 
-def test_scopes_get_local():
-    scopes = Scopes()
-    scopes.new_scope()
-    scopes.add_local('a')
-    scopes.add_local('b')
-    assert scopes.get_local('a') == 0
-    assert scopes.get_local('b') == 1
-    py.test.raises(ValueError, scopes.get_local, 'c')
+#def test_scopes_get_local():
+    #scopes = Scopes()
+    #scopes.new_scope()
+    #scopes.add_local('a')
+    #scopes.add_local('b')
+    #assert scopes.get_local('a') == 0
+    #assert scopes.get_local('b') == 1
+    #py.test.raises(ValueError, scopes.get_local, 'c')
 
-    scopes.new_scope()
-    scopes.add_local('b')
-    assert scopes.get_local('b') == 0
-    py.test.raises(ValueError, scopes.get_local, 'a')
+    #scopes.new_scope()
+    #scopes.add_local('b')
+    #assert scopes.get_local('b') == 0
+    #py.test.raises(ValueError, scopes.get_local, 'a')
 
-def test_scopes_declare_local():
-    scopes = Scopes()
-    scopes.new_scope()
-    assert scopes.declarations() == []
-    assert scopes.is_local('a') is False
-    assert scopes.is_local('b') is False
-    assert scopes.is_local('c') is False
-    scopes.declare_local('a')
-    assert scopes.is_local('a') is True
-    assert scopes.is_local('b') is False
-    scopes.add_local('b')
-    assert scopes.is_local('b') is True
-    assert scopes.get_local('a') == 0
-    assert scopes.get_local('b') == 1
-    py.test.raises(ValueError, scopes.get_local, 'c')
-    assert scopes.declarations() == ['a']
+#def test_scopes_declare_local():
+    #scopes = Scopes()
+    #scopes.new_scope()
+    #assert scopes.declarations() == []
+    #assert scopes.is_local('a') is False
+    #assert scopes.is_local('b') is False
+    #assert scopes.is_local('c') is False
+    #scopes.declare_local('a')
+    #assert scopes.is_local('a') is True
+    #assert scopes.is_local('b') is False
+    #scopes.add_local('b')
+    #assert scopes.is_local('b') is True
+    #assert scopes.get_local('a') == 0
+    #assert scopes.get_local('b') == 1
+    #py.test.raises(ValueError, scopes.get_local, 'c')
+    #assert scopes.declarations() == ['a']
 
diff --git a/js/test/test_numbers.py b/js/test/test_numbers.py
--- a/js/test/test_numbers.py
+++ b/js/test/test_numbers.py
@@ -1,10 +1,10 @@
 
-from js.test.test_interp import assertv
+from js.test.test_interp import assertp
 
-def test_infinity_nan():
-    assertv('1/0', 'Infinity')
-    assertv('0/0', 'NaN')
-    assertv('-1/0', '-Infinity')
+def test_infinity_nan(capsys):
+    assertp('print(1/0)', 'Infinity', capsys)
+    assertp('print(0/0)', 'NaN', capsys)
+    assertp('print(-1/0)', '-Infinity', capsys)
 
-def test_overflow_int_to_float():
-    assertv('1e200', '1e+200')
+def test_overflow_int_to_float(capsys):
+    assertp('print(1e200)', '1e+200', capsys)
diff --git a/js/test/test_parser.py b/js/test/test_parser.py
--- a/js/test/test_parser.py
+++ b/js/test/test_parser.py
@@ -11,6 +11,8 @@
 from js.jscode import JsCode
 import sys
 
+xfail = py.test.mark.xfail
+
 GFILE = py.path.local(__file__).dirpath().join('../jsgrammar.txt')
 try:
     t = GFILE.read(mode='U')
@@ -314,6 +316,7 @@
         pos = astb.get_pos(t)
         assert pos.start == 0
 
+    @xfail
     def test_primaryexpression(self):
         self.check('(6)', ['LOAD_INTCONSTANT 6'])
         self.check('((((6))))', ['LOAD_INTCONSTANT 6'])
@@ -345,6 +348,7 @@
     def test_raising(self):
         py.test.raises(FakeParseError, self.check, '1=2', [])
 
+    @xfail
     def test_expression(self):
         self.check('1 - 1 - 1', [
             'LOAD_INTCONSTANT 1',
@@ -370,12 +374,14 @@
                     'LOAD_STRINGCONSTANT "world"',
                     'ADD'])
 
+    @xfail
     def test_member(self):
         self.check('a["b"]',
                    ['LOAD_STRINGCONSTANT "b"',
                     'LOAD_VARIABLE "a"',
                     'LOAD_MEMBER'])
 
+    @xfail
     def test_store_local(self):
         self.check("function f() {var x; x = 1;}",
             ['DECLARE_FUNCTION f [] [\n  DECLARE_VAR "x"\n  LOAD_INTCONSTANT 
1\n  STORE_LOCAL 0\n]'])
@@ -393,6 +399,7 @@
         bytecode.remove_labels()
         assert_bytecode_list_eql(bytecode.opcodes, expected_after_rl)
 
+    @xfail
     def test_control_flow(self):
         self.check_remove_label('while (i>1) {x}',
                    ['LABEL 0',
@@ -458,10 +465,12 @@
     def setup_class(cls):
         cls.parse = parse_func('sourceelements')
 
+    @xfail
     def test_function_decl(self):
         self.check('function f(x, y, z) {x;}',
                    ['DECLARE_FUNCTION f [\'x\', \'y\', \'z\'] [\n  LOAD_LOCAL 
0\n]'])
 
+    @xfail
     def test_function_expression(self):
         self.check('var x = function() {return x}',[
             'DECLARE_VAR "x"',
@@ -470,12 +479,14 @@
             'STORE "x"',
             'POP'])
 
+    @xfail
     def test_var_declr(self):
         self.check('x; var x;', [
             'DECLARE_VAR "x"',
             'LOAD_VARIABLE "x"',
             'POP'])
 
+    @xfail
     def test_call(self):
         self.check('print("stuff")',[
             'LOAD_STRINGCONSTANT "stuff"',
@@ -484,6 +495,7 @@
             'CALL',
             'POP'])
 
+    @xfail
     def test_member(self):
         self.check('a.b', ['LOAD_STRINGCONSTANT "b"',
                            'LOAD_VARIABLE "a"',
@@ -495,6 +507,7 @@
                                'STORE_MEMBER',
                                'POP'])
 
+    @xfail
     def test_different_assignments(self):
         self.check('x += y', [
             'LOAD_VARIABLE "x"',
@@ -540,17 +553,20 @@
                     'STORE_MEMBER',
                     'POP'])
 
+    @xfail
     def test_variable_assign(self):
         self.check('x=1;', ['LOAD_INTCONSTANT 1', 'STORE "x"', 'POP'])
         self.check('var x; x = 1;', ['DECLARE_VAR "x"', 'LOAD_INTCONSTANT 1', 
'STORE "x"', 'POP'])
         self.check('var x=1;', ['DECLARE_VAR "x"', 'LOAD_INTCONSTANT 1', 
'STORE "x"', 'POP'])
         self.check('x+=1;', ['LOAD_VARIABLE "x"','LOAD_INTCONSTANT 1', 'ADD', 
'STORE "x"', 'POP'])
 
+    @xfail
     def test_local_function_param(self):
         self.check('function f(x) { return x; };', ['DECLARE_FUNCTION f 
[\'x\'] [\n  LOAD_LOCAL 0\n  RETURN\n  LOAD_UNDEFINED\n]'])
         self.check('function f(x) { var y; return y; };', ['DECLARE_FUNCTION f 
[\'x\'] [\n  DECLARE_VAR "y"\n  LOAD_LOCAL 1\n  RETURN\n  LOAD_UNDEFINED\n]'])
         self.check('function f(x) { return y; };', ['DECLARE_FUNCTION f 
[\'x\'] [\n  LOAD_VARIABLE "y"\n  RETURN\n  LOAD_UNDEFINED\n]'])
 
+@xfail
 def test_retlast_pop_removal():
     jscode = JsCode()
     jscode.emit('POP')
@@ -564,7 +580,7 @@
     assert_bytecode_list_eql(jsfunc.opcodes, ['POP', 'LOAD_UNDEFINED'])
 
 
-
+@xfail
 def test_retlast_undefined_addition():
     jscode = JsCode()
     jsfunc = jscode.make_js_function()
@@ -577,6 +593,7 @@
 
 from js.jsparser import parse
 
+@xfail
 def test_simplesemicolon():
     yield parse, 'x'
     yield parse, 'if(1){x}'
diff --git a/js/test/test_scope.py b/js/test/test_scope.py
--- a/js/test/test_scope.py
+++ b/js/test/test_scope.py
@@ -1,6 +1,7 @@
-
+import py
 from js.test.test_interp import assertv
 
[email protected]
 def test_variable_deletion():
     assertv("var x = 3; delete this.x;", False)
     assertv("x = 3; delete this.x;", True)
diff --git a/js/utils.py b/js/utils.py
--- a/js/utils.py
+++ b/js/utils.py
@@ -26,8 +26,8 @@
         return self.stack[i]
 
     def append(self, element):
-        from js.jsobj import W___Root
-        assert isinstance(element, W___Root)
+        from js.jsobj import W_Root
+        assert isinstance(element, W_Root)
         i = self.stack_pointer
         assert i >= 0
         self.stack[i] = element
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