private DynamicMetaObject /*!*/ GetFallbackError(DynamicMetaObjectBinder /*!*/ member)
{
if (member is PythonGetMemberBinder)
{
// accessing from Python, produce our error
PythonGetMemberBinder pb = member as PythonGetMemberBinder;
if (pb.IsNoThrow)
{
return(new DynamicMetaObject(
Expression.Constant(OperationFailed.Value),
BindingRestrictions.GetInstanceRestriction(Expression, Value).Merge(Restrictions)
));
}
else
{
return(new DynamicMetaObject(
member.Throw(
Ast.Call(
typeof(PythonOps).GetMethod(
nameof(PythonOps.AttributeErrorForMissingAttribute),
new Type[] { typeof(string), typeof(string) }
),
AstUtils.Constant(DynamicHelpers.GetPythonType(Value).Name),
AstUtils.Constant(pb.Name)
),
typeof(object)
),
BindingRestrictions.GetInstanceRestriction(Expression, Value).Merge(Restrictions)
));
}
}
// let the calling language bind the .NET members
return(((GetMemberBinder)member).FallbackGetMember(_type));
}
/// <summary>
/// Helper for falling back - if we have a base object fallback to it first (which can
/// then fallback to the calling site), otherwise fallback to the calling site.
/// </summary>
private DynamicMetaObject /*!*/ Fallback(DynamicMetaObjectBinder /*!*/ action, DynamicMetaObject codeContext)
{
if (_baseMetaObject != null)
{
IPythonGetable ipyget = _baseMetaObject as IPythonGetable;
if (ipyget != null)
{
PythonGetMemberBinder gmb = action as PythonGetMemberBinder;
if (gmb != null)
{
return(ipyget.GetMember(gmb, codeContext));
}
}
GetMemberBinder gma = action as GetMemberBinder;
if (gma != null)
{
return(_baseMetaObject.BindGetMember(gma));
}
return(_baseMetaObject.BindGetMember(
PythonContext.GetPythonContext(action).CompatGetMember(
GetGetMemberName(action),
false
)
));
}
return(GetMemberFallback(this, action, codeContext));
}
private Expression FallbackGet(DynamicMetaObjectBinder member, DynamicMetaObject[] args)
{
if (member is GetMemberBinder sa)
{
return(sa.FallbackGetMember(args[0]).Expression);
}
PythonGetMemberBinder pyGetMem = member as PythonGetMemberBinder;
if (pyGetMem.IsNoThrow)
{
return(Ast.Field(
null,
typeof(OperationFailed).GetDeclaredField("Value")
));
}
else
{
return(member.Throw(
Ast.Call(
typeof(PythonOps).GetMethod(nameof(PythonOps.AttributeError)),
AstUtils.Constant("{0} instance has no attribute '{1}'"),
Ast.NewArrayInit(
typeof(object),
AstUtils.Constant(((OldInstance)Value)._class._name),
AstUtils.Constant(pyGetMem.Name)
)
)
));
}
}
public FastGetBinderHelper(PythonType type, CodeContext context, PythonGetMemberBinder binder)
: base(type, context, binder.Name)
{
// capture these before we start producing the result
_version = type.Version;
_metaVersion = DynamicHelpers.GetPythonType(type).Version;
_binder = binder;
}
public DynamicGetMemberExpression(PythonGetMemberBinder/*!*/ binder, CompilationMode/*!*/ mode, MSAst.Expression/*!*/ target, MSAst.Expression codeContext) {
Assert.NotNull(binder, mode, target, codeContext);
_binder = binder;
_mode = mode;
_target = target;
_codeContext = codeContext;
}
public override DynamicMetaObject FallbackGetMember(DynamicMetaObject self, DynamicMetaObject errorSuggestion)
{
#if FEATURE_COM
DynamicMetaObject com;
if (Microsoft.Scripting.ComInterop.ComBinder.TryBindGetMember(this, self, out com, true))
{
return(com);
}
#endif
return(PythonGetMemberBinder.FallbackWorker(_context, self, PythonContext.GetCodeContextMOCls(this), Name, _isNoThrow ? GetMemberOptions.IsNoThrow : GetMemberOptions.None, this, errorSuggestion));
}
internal static bool IsNoThrow(DynamicMetaObjectBinder action)
{
PythonGetMemberBinder gmb = action as PythonGetMemberBinder;
if (gmb != null)
{
return(gmb.IsNoThrow);
}
return(false);
}
protected static DynamicMetaObject GetMemberFallback(DynamicMetaObject self, DynamicMetaObjectBinder member, DynamicMetaObject codeContext)
{
PythonGetMemberBinder gmb = member as PythonGetMemberBinder;
if (gmb != null)
{
return(gmb.Fallback(self, codeContext));
}
GetMemberBinder gma = (GetMemberBinder)member;
return(gma.FallbackGetMember(self.Restrict(self.GetLimitType())));
}
public override bool Equals(object obj)
{
PythonGetMemberBinder ob = obj as PythonGetMemberBinder;
if (ob == null)
{
return(false);
}
return(ob._context.Binder == _context.Binder &&
ob._options == _options &&
ob._name == _name);
}
protected static string GetGetMemberName(DynamicMetaObjectBinder member)
{
PythonGetMemberBinder gmb = member as PythonGetMemberBinder;
if (gmb != null)
{
return(gmb.Name);
}
InvokeMemberBinder invoke = member as InvokeMemberBinder;
if (invoke != null)
{
return(invoke.Name);
}
GetMemberBinder gma = (GetMemberBinder)member;
return(gma.Name);
}
internal PythonGetMemberBinder/*!*/ GetMember(string/*!*/ name, bool isNoThrow) {
Dictionary<string, PythonGetMemberBinder> dict;
if (isNoThrow) {
if (_tryGetMemberBinders == null) {
Interlocked.CompareExchange(
ref _tryGetMemberBinders,
new Dictionary<string, PythonGetMemberBinder>(),
null
);
}
dict = _tryGetMemberBinders;
} else {
if (_getMemberBinders == null) {
Interlocked.CompareExchange(
ref _getMemberBinders,
new Dictionary<string, PythonGetMemberBinder>(),
null
);
}
dict = _getMemberBinders;
}
lock (dict) {
PythonGetMemberBinder res;
if (!dict.TryGetValue(name, out res)) {
dict[name] = res = new PythonGetMemberBinder(this, name, isNoThrow);
}
return res;
}
}
public DynamicMetaObject GetMember(PythonGetMemberBinder member, DynamicMetaObject codeContext) {
// no codeContext filtering but avoid an extra site by handling this action directly
return MakeMemberAccess(member, member.Name, MemberAccess.Get, this);
}
public DynamicMetaObject GetMember(PythonGetMemberBinder member, DynamicMetaObject codeContext) {
return BindGetMemberWorker(member, member.Name, codeContext);
}
public DynamicMetaObject GetMember(PythonGetMemberBinder member, DynamicMetaObject codeContext) {
// no codeContext filtering but avoid an extra site by handling this action directly
return MakeGetMember(member, codeContext);
}
public DynamicMetaObject GetMember(PythonGetMemberBinder member, DynamicMetaObject codeContext)
{
// no codeContext filtering but avoid an extra site by handling this action directly
return(MakeMemberAccess(member, member.Name, MemberAccess.Get, this));
}
public GetMemberInstruction(PythonGetMemberBinder binder) {
_binder = binder;
}
public FastGetBase(PythonGetMemberBinder/*!*/ binder) {
Assert.NotNull(binder);
_binder = binder;
}
public DynamicMetaObject /*!*/ GetMember(PythonGetMemberBinder /*!*/ member, DynamicMetaObject /*!*/ codeContext)
{
return(GetMemberWorker(member, codeContext.Expression));
}
public DynamicMetaObject GetMember(PythonGetMemberBinder/*!*/ member, Expression/*!*/ codeContext) {
return GetMemberWorker(member, codeContext);
}