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go/ast: deprecate Object

The following declarations related to syntactic object resolution
are now deprecated:
- Ident.Obj
- Object
- Scope
- File.{Scope,Unresolved}
- Importer
- Package, NewPackage
New programs should use the type checker instead.

Updates golang/go#52463
Updates golang/go#48141

Change-Id: I82b315f49b1341c11ae20dcbf81106084bd2ba86
Reviewed-on: https://go-review.googlesource.com/c/go/+/504915
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Robert Findley <rfindley@google.com>
Run-TryBot: Alan Donovan <adonovan@google.com>
This commit is contained in:
Alan Donovan 2023-06-21 13:49:42 -04:00
parent 0236686382
commit 6f1b895daf
5 changed files with 36 additions and 8 deletions

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@ -167,7 +167,12 @@ pkg errors, var ErrUnsupported error #41198
pkg flag, func BoolFunc(string, string, func(string) error) #53747
pkg flag, method (*FlagSet) BoolFunc(string, string, func(string) error) #53747
pkg go/ast, func IsGenerated(*File) bool #28089
pkg go/ast, func NewPackage //deprecated #52463
pkg go/ast, type File struct, GoVersion string #59033
pkg go/ast, type Importer //deprecated #52463
pkg go/ast, type Object //deprecated #52463
pkg go/ast, type Package //deprecated #52463
pkg go/ast, type Scope //deprecated #52463
pkg go/build/constraint, func GoVersion(Expr) string #59033
pkg go/build, type Directive struct #56986
pkg go/build, type Directive struct, Pos token.Position #56986

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@ -287,7 +287,7 @@ type (
Ident struct {
NamePos token.Pos // identifier position
Name string // identifier name
Obj *Object // denoted object; or nil
Obj *Object // denoted object, or nil. Deprecated: see Object.
}
// An Ellipsis node stands for the "..." type in a
@ -1042,9 +1042,9 @@ type File struct {
Decls []Decl // top-level declarations; or nil
FileStart, FileEnd token.Pos // start and end of entire file
Scope *Scope // package scope (this file only)
Scope *Scope // package scope (this file only). Deprecated: see Object
Imports []*ImportSpec // imports in this file
Unresolved []*Ident // unresolved identifiers in this file
Unresolved []*Ident // unresolved identifiers in this file. Deprecated: see Object
Comments []*CommentGroup // list of all comments in the source file
GoVersion string // minimum Go version required by //go:build or // +build directives
}
@ -1064,6 +1064,8 @@ func (f *File) End() token.Pos {
// A Package node represents a set of source files
// collectively building a Go package.
//
// Deprecated: use the type checker [go/types] instead; see [Object].
type Package struct {
Name string // package name
Scope *Scope // package scope across all files

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@ -60,6 +60,8 @@ func resolve(scope *Scope, ident *Ident) bool {
// Importer should load the package data for the given path into
// a new *Object (pkg), record pkg in the imports map, and then
// return pkg.
//
// Deprecated: use the type checker [go/types] instead; see [Object].
type Importer func(imports map[string]*Object, path string) (pkg *Object, err error)
// NewPackage creates a new Package node from a set of File nodes. It resolves
@ -70,6 +72,8 @@ type Importer func(imports map[string]*Object, path string) (pkg *Object, err er
// belong to different packages, one package name is selected and files with
// different package names are reported and then ignored.
// The result is a package node and a scanner.ErrorList if there were errors.
//
// Deprecated: use the type checker [go/types] instead; see [Object].
func NewPackage(fset *token.FileSet, files map[string]*File, importer Importer, universe *Scope) (*Package, error) {
var p pkgBuilder
p.fset = fset

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@ -15,6 +15,8 @@ import (
// A Scope maintains the set of named language entities declared
// in the scope and a link to the immediately surrounding (outer)
// scope.
//
// Deprecated: use the type checker [go/types] instead; see [Object].
type Scope struct {
Outer *Scope
Objects map[string]*Object
@ -69,6 +71,19 @@ func (s *Scope) String() string {
// Kind Data type Data value
// Pkg *Scope package scope
// Con int iota for the respective declaration
//
// Deprecated: The relationship between Idents and Objects cannot be
// correctly computed without type information. For example, the
// expression T{K: 0} may denote a struct, map, slice, or array
// literal, depending on the type of T. If T is a struct, then K
// refers to a field of T, whereas for the other types it refers to a
// value in the environment.
//
// New programs should set the [parser.SkipObjectResolution] parser
// flag to disable syntactic object resolution (which also saves CPU
// and memory), and instead use the type checker [go/types] if object
// resolution is desired. See the Defs, Uses, and Implicits fields of
// the [types.Info] struct for details.
type Object struct {
Kind ObjKind
Name string // declared name

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@ -53,7 +53,7 @@ const (
Trace // print a trace of parsed productions
DeclarationErrors // report declaration errors
SpuriousErrors // same as AllErrors, for backward-compatibility
SkipObjectResolution // don't resolve identifiers to objects - see ParseFile
SkipObjectResolution // skip deprecated identifier resolution; see ParseFile
AllErrors = SpuriousErrors // report all errors (not just the first 10 on different lines)
)
@ -66,10 +66,12 @@ const (
// for the src parameter must be string, []byte, or io.Reader.
// If src == nil, ParseFile parses the file specified by filename.
//
// The mode parameter controls the amount of source text parsed and other
// optional parser functionality. If the SkipObjectResolution mode bit is set,
// the object resolution phase of parsing will be skipped, causing File.Scope,
// File.Unresolved, and all Ident.Obj fields to be nil.
// The mode parameter controls the amount of source text parsed and
// other optional parser functionality. If the SkipObjectResolution
// mode bit is set (recommended), the object resolution phase of
// parsing will be skipped, causing File.Scope, File.Unresolved, and
// all Ident.Obj fields to be nil. Those fields are deprecated; see
// [ast.Object] for details.
//
// Position information is recorded in the file set fset, which must not be
// nil.