/// <summary>
/// Creating a Python type involves calling __new__ and __init__. We resolve them
/// and generate calls to either the builtin funcions directly or embed sites which
/// call the slots at runtime.
/// </summary>
private DynamicMetaObject/*!*/ MakePythonTypeCall(DynamicMetaObjectBinder/*!*/ call, Expression/*!*/ codeContext, DynamicMetaObject/*!*/[]/*!*/ args) {
ValidationInfo valInfo = MakeVersionCheck();
DynamicMetaObject self = new RestrictedMetaObject(
AstUtils.Convert(Expression, LimitType),
BindingRestrictionsHelpers.GetRuntimeTypeRestriction(Expression, LimitType),
Value
);
CallSignature sig = BindingHelpers.GetCallSignature(call);
ArgumentValues ai = new ArgumentValues(sig, self, args);
NewAdapter newAdapter;
InitAdapter initAdapter;
if (TooManyArgsForDefaultNew(call, args)) {
return MakeIncorrectArgumentsForCallError(call, ai, valInfo);
} else if (Value.UnderlyingSystemType.IsGenericTypeDefinition()) {
return MakeGenericTypeDefinitionError(call, ai, valInfo);
} else if (Value.HasAbstractMethods(PythonContext.GetPythonContext(call).SharedContext)) {
return MakeAbstractInstantiationError(call, ai, valInfo);
}
DynamicMetaObject translated = BuiltinFunction.TranslateArguments(call, codeContext, self, args, false, Value.Name);
if (translated != null) {
return translated;
}
GetAdapters(ai, call, codeContext, out newAdapter, out initAdapter);
PythonContext state = PythonContext.GetPythonContext(call);
// get the expression for calling __new__
DynamicMetaObject createExpr = newAdapter.GetExpression(state.Binder);
if (createExpr.Expression.Type == typeof(void)) {
return BindingHelpers.AddDynamicTestAndDefer(
call,
createExpr,
args,
valInfo
);
}
Expression res;
BindingRestrictions additionalRestrictions = BindingRestrictions.Empty;
if (!Value.IsSystemType && (!(newAdapter is DefaultNewAdapter) || HasFinalizer(call))) {
// we need to dynamically check the return value to see if it's a subtype of
// the type that we are calling. If it is then we need to call __init__/__del__
// for the actual returned type.
res = DynamicExpression.Dynamic(
Value.GetLateBoundInitBinder(sig),
typeof(object),
ArrayUtils.Insert(
codeContext,
Expression.Convert(createExpr.Expression, typeof(object)),
DynamicUtils.GetExpressions(args)
)
);
additionalRestrictions = createExpr.Restrictions;
} else {
// just call the __init__ method, built-in types currently have
// no wacky return values which don't return the derived type.
// then get the statement for calling __init__
ParameterExpression allocatedInst = Ast.Variable(createExpr.GetLimitType(), "newInst");
Expression tmpRead = allocatedInst;
DynamicMetaObject initCall = initAdapter.MakeInitCall(
state.Binder,
new RestrictedMetaObject(
AstUtils.Convert(allocatedInst, Value.UnderlyingSystemType),
createExpr.Restrictions
)
);
List<Expression> body = new List<Expression>();
Debug.Assert(!HasFinalizer(call));
// add the call to init if we need to
if (initCall.Expression != tmpRead) {
// init can fail but if __new__ returns a different type
// no exception is raised.
DynamicMetaObject initStmt = initCall;
if (body.Count == 0) {
body.Add(
Ast.Assign(allocatedInst, createExpr.Expression)
);
}
if (!Value.UnderlyingSystemType.IsAssignableFrom(createExpr.Expression.Type)) {
// return type of object, we need to check the return type before calling __init__.
body.Add(
AstUtils.IfThen(
Ast.TypeIs(allocatedInst, Value.UnderlyingSystemType),
initStmt.Expression
)
);
} else {
// just call the __init__ method, no type check necessary (TODO: need null check?)
body.Add(initStmt.Expression);
}
}
// and build the target from everything we have
if (body.Count == 0) {
res = createExpr.Expression;
} else {
body.Add(allocatedInst);
res = Ast.Block(body);
}
res = Ast.Block(new ParameterExpression[] { allocatedInst }, res);
additionalRestrictions = initCall.Restrictions;
}
return BindingHelpers.AddDynamicTestAndDefer(
call,
new DynamicMetaObject(
res,
self.Restrictions.Merge(additionalRestrictions)
),
ArrayUtils.Insert(this, args),
valInfo
);
}
/// <summary>
/// Creating a Python type involves calling __new__ and __init__. We resolve them
/// and generate calls to either the builtin funcions directly or embed sites which
/// call the slots at runtime.
/// </summary>
private DynamicMetaObject/*!*/ MakePythonTypeCall(DynamicMetaObjectBinder/*!*/ call, Expression/*!*/ codeContext, DynamicMetaObject/*!*/[]/*!*/ args) {
ValidationInfo valInfo = MakeVersionCheck();
DynamicMetaObject self = new RestrictedMetaObject(
AstUtils.Convert(Expression, LimitType),
BindingRestrictionsHelpers.GetRuntimeTypeRestriction(Expression, LimitType),
Value
);
ArgumentValues ai = new ArgumentValues(BindingHelpers.GetCallSignature(call), self, args);
NewAdapter newAdapter;
InitAdapter initAdapter;
if (TooManyArgsForDefaultNew(call, args)) {
return MakeIncorrectArgumentsForCallError(call, ai, valInfo);
}
GetAdapters(ai, call, codeContext, out newAdapter, out initAdapter);
BinderState state = BinderState.GetBinderState(call);
// get the expression for calling __new__
DynamicMetaObject createExpr = newAdapter.GetExpression(state.Binder);
if (createExpr.Expression.Type == typeof(void)) {
return BindingHelpers.AddDynamicTestAndDefer(
call,
createExpr,
args,
valInfo
);
}
// then get the statement for calling __init__
ParameterExpression allocatedInst = Ast.Variable(createExpr.GetLimitType(), "newInst");
Expression tmpRead = allocatedInst;
DynamicMetaObject initCall = initAdapter.MakeInitCall(
state.Binder,
new RestrictedMetaObject(
AstUtils.Convert(allocatedInst, Value.UnderlyingSystemType),
createExpr.Restrictions
)
);
List<Expression> body = new List<Expression>();
// then get the call to __del__ if we need one
if (HasFinalizer(call)) {
body.Add(
Ast.Assign(allocatedInst, createExpr.Expression)
);
body.Add(
GetFinalizerInitialization(call, allocatedInst)
);
}
// add the call to init if we need to
if (initCall.Expression != tmpRead) {
// init can fail but if __new__ returns a different type
// no exception is raised.
DynamicMetaObject initStmt = initCall;
if (body.Count == 0) {
body.Add(
Ast.Assign(allocatedInst, createExpr.Expression)
);
}
if (!Value.UnderlyingSystemType.IsAssignableFrom(createExpr.Expression.Type)) {
// return type of object, we need to check the return type before calling __init__.
body.Add(
AstUtils.IfThen(
Ast.TypeIs(allocatedInst, Value.UnderlyingSystemType),
initStmt.Expression
)
);
} else {
// just call the __init__ method, no type check necessary (TODO: need null check?)
body.Add(initStmt.Expression);
}
}
Expression res;
// and build the target from everything we have
if (body.Count == 0) {
res = createExpr.Expression;
} else {
body.Add(allocatedInst);
res = Ast.Block(body);
}
res = Ast.Block(new ParameterExpression[] { allocatedInst }, res);
return BindingHelpers.AddDynamicTestAndDefer(
call,
new DynamicMetaObject(
res,
self.Restrictions.Merge(initCall.Restrictions)
),
ArrayUtils.Insert(this, args),
valInfo
);
}