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Copy pathobject.go
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371 lines (346 loc) · 11.3 KB
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// Copyright 2016 Google Inc. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package grumpy
import (
"fmt"
"reflect"
"sync/atomic"
"unsafe"
)
var (
objectBasis = reflect.TypeOf(Object{})
objectReconstructorFunc = newBuiltinFunction("_reconstructor", objectReconstructor).ToObject()
objectReduceFunc = newBuiltinFunction("__reduce__", objectReduce).ToObject()
// ObjectType is the object representing the Python 'object' type.
//
// We don't use newBasisType() here since that introduces an initialization
// cycle between TypeType and ObjectType.
ObjectType = &Type{
name: "object",
basis: objectBasis,
flags: typeFlagDefault,
slots: typeSlots{Basis: &basisSlot{objectBasisFunc}},
}
)
// Object represents Python 'object' objects.
type Object struct {
typ *Type `attr:"__class__"`
dict *Dict
ref *WeakRef
}
func newObject(t *Type) *Object {
var dict *Dict
if t != ObjectType {
dict = NewDict()
}
o := (*Object)(unsafe.Pointer(reflect.New(t.basis).Pointer()))
o.typ = t
o.setDict(dict)
return o
}
// Call invokes the callable Python object o with the given positional and
// keyword args. args must be non-nil (but can be empty). kwargs can be nil.
func (o *Object) Call(f *Frame, args Args, kwargs KWArgs) (*Object, *BaseException) {
call := o.Type().slots.Call
if call == nil {
return nil, f.RaiseType(TypeErrorType, fmt.Sprintf("'%s' object is not callable", o.Type().Name()))
}
return call.Fn(f, o, args, kwargs)
}
// Dict returns o's object dict, aka __dict__.
func (o *Object) Dict() *Dict {
p := (*unsafe.Pointer)(unsafe.Pointer(&o.dict))
return (*Dict)(atomic.LoadPointer(p))
}
func (o *Object) setDict(d *Dict) {
p := (*unsafe.Pointer)(unsafe.Pointer(&o.dict))
atomic.StorePointer(p, unsafe.Pointer(d))
}
// String returns a string representation of o, e.g. for debugging.
func (o *Object) String() string {
if o == nil {
return "nil"
}
s, raised := Repr(NewRootFrame(), o)
if raised != nil {
return fmt.Sprintf("<%s object (repr raised %s)>", o.typ.Name(), raised.typ.Name())
}
return s.Value()
}
// Type returns the Python type of o.
func (o *Object) Type() *Type {
return o.typ
}
func (o *Object) toPointer() unsafe.Pointer {
return unsafe.Pointer(o)
}
func (o *Object) isInstance(t *Type) bool {
return o.typ.isSubclass(t)
}
func objectBasisFunc(o *Object) reflect.Value {
return reflect.ValueOf(o).Elem()
}
func objectDelAttr(f *Frame, o *Object, name *Str) *BaseException {
desc, raised := o.typ.mroLookup(f, name)
if raised != nil {
return raised
}
if desc != nil {
if del := desc.Type().slots.Delete; del != nil {
return del.Fn(f, desc, o)
}
}
deleted := false
d := o.Dict()
if d != nil {
deleted, raised = d.DelItem(f, name.ToObject())
if raised != nil {
return raised
}
}
if !deleted {
format := "'%s' object has no attribute '%s'"
return f.RaiseType(AttributeErrorType, fmt.Sprintf(format, o.typ.Name(), name.Value()))
}
return nil
}
// objectGetAttribute implements the spec here:
// https://docs.python.org/2/reference/datamodel.html#invoking-descriptors
func objectGetAttribute(f *Frame, o *Object, name *Str) (*Object, *BaseException) {
// Look for a data descriptor in the type.
var typeGet *getSlot
typeAttr, raised := o.typ.mroLookup(f, name)
if raised != nil {
return nil, raised
}
if typeAttr != nil {
typeGet = typeAttr.typ.slots.Get
if typeGet != nil && (typeAttr.typ.slots.Set != nil || typeAttr.typ.slots.Delete != nil) {
return typeGet.Fn(f, typeAttr, o, o.Type())
}
}
// Look in the object's dict.
if d := o.Dict(); d != nil {
value, raised := d.GetItem(f, name.ToObject())
if value != nil || raised != nil {
return value, raised
}
}
// Use the (non-data) descriptor from the type.
if typeGet != nil {
return typeGet.Fn(f, typeAttr, o, o.Type())
}
// Return the ordinary type attribute.
if typeAttr != nil {
return typeAttr, nil
}
format := "'%s' object has no attribute '%s'"
return nil, f.RaiseType(AttributeErrorType, fmt.Sprintf(format, o.typ.Name(), name.Value()))
}
func objectHash(f *Frame, o *Object) (*Object, *BaseException) {
return NewInt(int(uintptr(o.toPointer()))).ToObject(), nil
}
func objectNew(f *Frame, t *Type, _ Args, _ KWArgs) (*Object, *BaseException) {
if t.flags&typeFlagInstantiable == 0 {
format := "object.__new__(%s) is not safe, use %s.__new__()"
return nil, f.RaiseType(TypeErrorType, fmt.Sprintf(format, t.Name(), t.Name()))
}
return newObject(t), nil
}
func objectReduce(f *Frame, args Args, _ KWArgs) (*Object, *BaseException) {
expectedTypes := []*Type{ObjectType, IntType}
argc := len(args)
if argc == 1 {
expectedTypes = expectedTypes[:1]
}
if raised := checkMethodArgs(f, "__reduce__", args, expectedTypes...); raised != nil {
return nil, raised
}
return objectReduceCommon(f, args)
}
func objectReduceEx(f *Frame, args Args, _ KWArgs) (*Object, *BaseException) {
expectedTypes := []*Type{ObjectType, IntType}
argc := len(args)
if argc == 1 {
expectedTypes = expectedTypes[:1]
}
if raised := checkMethodArgs(f, "__reduce_ex__", args, expectedTypes...); raised != nil {
return nil, raised
}
reduce, raised := args[0].typ.mroLookup(f, NewStr("__reduce__"))
if raised != nil {
return nil, raised
}
if reduce != nil && reduce != objectReduceFunc {
// __reduce__ is overridden so prefer using it.
return reduce.Call(f, args, nil)
}
return objectReduceCommon(f, args)
}
func objectSetAttr(f *Frame, o *Object, name *Str, value *Object) *BaseException {
if typeAttr, raised := o.typ.mroLookup(f, name); raised != nil {
return raised
} else if typeAttr != nil {
if typeSet := typeAttr.typ.slots.Set; typeSet != nil {
return typeSet.Fn(f, typeAttr, o, value)
}
}
if d := o.Dict(); d != nil {
if raised := d.SetItem(f, name.ToObject(), value); raised == nil || !raised.isInstance(KeyErrorType) {
return nil
}
}
return f.RaiseType(AttributeErrorType, fmt.Sprintf("'%s' has no attribute '%s'", o.typ.Name(), name.Value()))
}
func initObjectType(dict map[string]*Object) {
ObjectType.typ = TypeType
dict["__reduce__"] = objectReduceFunc
dict["__reduce_ex__"] = newBuiltinFunction("__reduce_ex__", objectReduceEx).ToObject()
dict["__dict__"] = newProperty(newBuiltinFunction("_get_dict", objectGetDict).ToObject(), newBuiltinFunction("_set_dict", objectSetDict).ToObject(), nil).ToObject()
ObjectType.slots.DelAttr = &delAttrSlot{objectDelAttr}
ObjectType.slots.GetAttribute = &getAttributeSlot{objectGetAttribute}
ObjectType.slots.Hash = &unaryOpSlot{objectHash}
ObjectType.slots.New = &newSlot{objectNew}
ObjectType.slots.SetAttr = &setAttrSlot{objectSetAttr}
}
// objectReconstructor builds an object from a class, its basis type and its
// state (e.g. its string or integer value). It is similar to the
// copy_reg._reconstructor function in CPython.
func objectReconstructor(f *Frame, args Args, _ KWArgs) (*Object, *BaseException) {
if raised := checkFunctionArgs(f, "_reconstructor", args, TypeType, TypeType, ObjectType); raised != nil {
return nil, raised
}
t, basisType, state := toTypeUnsafe(args[0]), toTypeUnsafe(args[1]), args[2]
newMethod, raised := GetAttr(f, basisType.ToObject(), NewStr("__new__"), nil)
if raised != nil {
return nil, raised
}
o, raised := newMethod.Call(f, Args{t.ToObject(), state}, nil)
if raised != nil {
return nil, raised
}
if basisType != ObjectType {
initMethod, raised := GetAttr(f, basisType.ToObject(), NewStr("__init__"), None)
if raised != nil {
return nil, raised
}
if initMethod != None {
if _, raised := initMethod.Call(f, Args{o, state}, nil); raised != nil {
return nil, raised
}
}
}
return o, nil
}
func objectReduceCommon(f *Frame, args Args) (*Object, *BaseException) {
// TODO: Support __getstate__ and __getnewargs__.
o := args[0]
t := o.Type()
proto := 0
if len(args) > 1 {
proto = toIntUnsafe(args[1]).Value()
}
var raised *BaseException
if proto < 2 {
basisType := basisTypes[t.basis]
if basisType == t {
// Basis types are handled elsewhere by the pickle and
// copy frameworks. This matches behavior in
// copy_reg._reduce_ex in CPython.
return nil, f.RaiseType(TypeErrorType, fmt.Sprintf("can't pickle %s objects", t.Name()))
}
state := None
if basisType != ObjectType {
// For subclasses of basis types having state (e.g.
// integer values), the state is captured by creating
// an instance of that basis type.
if state, raised = basisType.Call(f, Args{o}, nil); raised != nil {
return nil, raised
}
}
newArgs := NewTuple3(t.ToObject(), basisType.ToObject(), state).ToObject()
if d := o.Dict(); d != nil {
return NewTuple3(objectReconstructorFunc, newArgs, d.ToObject()).ToObject(), nil
}
return NewTuple2(objectReconstructorFunc, newArgs).ToObject(), nil
}
newArgs := []*Object{t.ToObject()}
getNewArgsMethod, raised := GetAttr(f, o, NewStr("__getnewargs__"), None)
if raised != nil {
return nil, raised
}
if getNewArgsMethod != None {
extraNewArgs, raised := getNewArgsMethod.Call(f, nil, nil)
if raised != nil {
return nil, raised
}
if !extraNewArgs.isInstance(TupleType) {
format := "__getnewargs__ should return a tuple, not '%s'"
return nil, f.RaiseType(TypeErrorType, fmt.Sprintf(format, extraNewArgs.Type().Name()))
}
newArgs = append(newArgs, toTupleUnsafe(extraNewArgs).elems...)
}
dict := None
if d := o.Dict(); d != nil {
dict = d.ToObject()
}
// For proto >= 2 include list and dict items.
listItems := None
if o.isInstance(ListType) {
if listItems, raised = Iter(f, o); raised != nil {
return nil, raised
}
}
dictItems := None
if o.isInstance(DictType) {
iterItems, raised := o.typ.mroLookup(f, NewStr("iteritems"))
if raised != nil {
return nil, raised
}
if iterItems != nil {
if dictItems, raised = iterItems.Call(f, Args{o}, nil); raised != nil {
return nil, raised
}
}
}
newFunc, raised := GetAttr(f, t.ToObject(), NewStr("__new__"), nil)
if raised != nil {
return nil, raised
}
return NewTuple5(newFunc, NewTuple(newArgs...).ToObject(), dict, listItems, dictItems).ToObject(), nil
}
func objectGetDict(f *Frame, args Args, _ KWArgs) (*Object, *BaseException) {
if raised := checkMethodArgs(f, "_get_dict", args, ObjectType); raised != nil {
return nil, raised
}
o := args[0]
d := o.Dict()
if d == nil {
format := "'%s' object has no attribute '__dict__'"
return nil, f.RaiseType(AttributeErrorType, fmt.Sprintf(format, o.typ.Name()))
}
return args[0].Dict().ToObject(), nil
}
func objectSetDict(f *Frame, args Args, _ KWArgs) (*Object, *BaseException) {
if raised := checkMethodArgs(f, "_set_dict", args, ObjectType, DictType); raised != nil {
return nil, raised
}
o := args[0]
if o.Type() == ObjectType {
format := "'%s' object has no attribute '__dict__'"
return nil, f.RaiseType(AttributeErrorType, fmt.Sprintf(format, o.typ.Name()))
}
o.setDict(toDictUnsafe(args[1]))
return None, nil
}
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