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f1e905b042
Change protoV1.ExtensionDesc to directly implement ExtensionType
rather than delegating to one.
Unify the previous types protoiface.ExtensionDescV1 and
filetype.Extension in impl.ExtensionInfo. The protoV1.ExtensionDesc
type becomes an alias to ExtensionInfo.
This gives us:
- Just one implementation of ExtensionType.
- Generated foopb.E_Ext vars are canonical ExtensionTypes.
- Generated foopb.E_Ext vars are also v1.ExtensionDescs for backwards
compatibility.
- Conversion between legacy and modern representations happens
transparently when lazily initializing an ExtensionInfo.
Overall, a simplification for users of generated code, since they can
mostly ignore the ExtensionDesc/ExtentionType distinction and use the
same value in either the old or new API.
This is change 3/5 in a series of commits changing protoV1.ExtensionDesc
to directly implement protoreflect.ExtensionType.
1. [v2] Add protoimpl.ExtensionInfo as an alias for
protoiface.ExtensionDescV1.
2. [v1] Update references to protoimpl.ExtensionInfo to use
protoiface.ExtensionInfo.
3. [v2] Create protoimpl.ExtensionInfo (an alias to a new type in
the impl package) and remove protoiface.ExtensionDescV1.
4. [v1] Remove unneeded explicit conversions between ExtensionDesc and
ExtensionType (since the former now directly implements the latter).
5. [v2] Remove stub conversion functions.
Change-Id: I96ee890541ec11b2412e1a72c9d7b96e4d7f66b4
Reviewed-on: https://go-review.googlesource.com/c/protobuf/+/189563
Reviewed-by: Joe Tsai <thebrokentoaster@gmail.com>
45 lines
1.5 KiB
Go
45 lines
1.5 KiB
Go
// Copyright 2018 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Package protoimpl contains the default implementation for messages
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// generated by protoc-gen-go.
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//
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// WARNING: This package should only ever be imported by generated messages.
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// The compatibility agreement covers nothing except for functionality needed
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// to keep existing generated messages operational. Breakages that occur due
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// to unauthorized usages of this package are not the author's responsibility.
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package protoimpl
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import (
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"google.golang.org/protobuf/internal/filedesc"
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"google.golang.org/protobuf/internal/filetype"
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"google.golang.org/protobuf/internal/impl"
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)
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// UnsafeEnabled specifies whether package unsafe can be used.
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const UnsafeEnabled = impl.UnsafeEnabled
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type (
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// Types used by generated code in init functions.
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DescBuilder = filedesc.Builder
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TypeBuilder = filetype.Builder
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// Types used by generated code to implement EnumType, MessageType, and ExtensionType.
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EnumInfo = filetype.EnumInfo
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MessageInfo = impl.MessageInfo
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ExtensionInfo = impl.ExtensionInfo
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// Types embedded in generated messages.
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MessageState = impl.MessageState
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SizeCache = impl.SizeCache
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WeakFields = impl.WeakFields
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UnknownFields = impl.UnknownFields
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ExtensionFields = impl.ExtensionFields
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ExtensionFieldV1 = impl.ExtensionField
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Pointer = impl.Pointer
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)
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var X impl.Export
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