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go/types: : generate assignments.go from types2 source

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This CL reduces the amount of code that needs to be maintained
manually by about 600 LOC.

Change-Id: I7107c8050075281bf6840a9f5234d70e09734ce6
Reviewed-on: https://go-review.googlesource.com/c/go/+/565836
Auto-Submit: Robert Griesemer <gri@google.com>
Reviewed-by: Robert Findley <rfindley@google.com>
Reviewed-by: Robert Griesemer <gri@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
This commit is contained in:
Robert Griesemer 2024-02-21 13:51:28 -08:00 committed by Gopher Robot
parent 638b9023e3
commit 55bb3d1c10
7 changed files with 70 additions and 31 deletions
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37
src/cmd/compile/internal/types2/assignments.go
View File

@ -24,7 +24,10 @@ func (check *Checker) assignment(x *operand, T Type, context string) {
switch x.mode {
case invalid:
return // error reported before
case constant_, variable, mapindex, value, nilvalue, commaok, commaerr:
case nilvalue:
assert(isTypes2)
// ok
case constant_, variable, mapindex, value, commaok, commaerr:
// ok
default:
// we may get here because of other problems (go.dev/issue/39634, crash 12)
@ -41,14 +44,25 @@ func (check *Checker) assignment(x *operand, T Type, context string) {
// bool, rune, int, float64, complex128 or string respectively, depending
// on whether the value is a boolean, rune, integer, floating-point,
// complex, or string constant."
if x.isNil() {
if T == nil {
check.errorf(x, UntypedNilUse, "use of untyped nil in %s", context)
x.mode = invalid
return
if isTypes2 {
if x.isNil() {
if T == nil {
check.errorf(x, UntypedNilUse, "use of untyped nil in %s", context)
x.mode = invalid
return
}
} else if T == nil || isNonTypeParamInterface(T) {
target = Default(x.typ)
}
} else { // go/types
if T == nil || isNonTypeParamInterface(T) {
if T == nil && x.typ == Typ[UntypedNil] {
check.errorf(x, UntypedNilUse, "use of untyped nil in %s", context)
x.mode = invalid
return
}
target = Default(x.typ)
}
} else if T == nil || isNonTypeParamInterface(T) {
target = Default(x.typ)
}
newType, val, code := check.implicitTypeAndValue(x, target)
if code != 0 {
@ -245,7 +259,7 @@ func (check *Checker) assignVar(lhs, rhs syntax.Expr, x *operand, context string
if x == nil {
var target *target
// avoid calling syntax.String if not needed
// avoid calling ExprString if not needed
if T != nil {
if _, ok := under(T).(*Signature); ok {
target = newTarget(T, ExprString(lhs))
@ -493,7 +507,7 @@ func (check *Checker) assignVars(lhs, orig_rhs []syntax.Expr) {
// orig_rhs[0] was already evaluated
}
func (check *Checker) shortVarDecl(pos syntax.Pos, lhs, rhs []syntax.Expr) {
func (check *Checker) shortVarDecl(pos poser, lhs, rhs []syntax.Expr) {
top := len(check.delayed)
scope := check.scope
@ -506,6 +520,7 @@ func (check *Checker) shortVarDecl(pos syntax.Pos, lhs, rhs []syntax.Expr) {
ident, _ := lhs.(*syntax.Name)
if ident == nil {
check.useLHS(lhs)
// TODO(gri) This is redundant with a go/parser error. Consider omitting in go/types?
check.errorf(lhs, BadDecl, "non-name %s on left side of :=", lhs)
hasErr = true
continue
@ -568,7 +583,7 @@ func (check *Checker) shortVarDecl(pos syntax.Pos, lhs, rhs []syntax.Expr) {
// a function begins at the end of the ConstSpec or VarSpec (ShortVarDecl
// for short variable declarations) and ends at the end of the innermost
// containing block."
scopePos := syntax.EndPos(rhs[len(rhs)-1])
scopePos := endPos(rhs[len(rhs)-1])
for _, obj := range newVars {
check.declare(scope, nil, obj, scopePos) // id = nil: recordDef already called
}

4
src/cmd/compile/internal/types2/operand.go
View File

@ -27,7 +27,7 @@ const (
variable // operand is an addressable variable
mapindex // operand is a map index expression (acts like a variable on lhs, commaok on rhs of an assignment)
value // operand is a computed value
nilvalue // operand is the nil value
nilvalue // operand is the nil value - only used by types2
commaok // like value, but operand may be used in a comma,ok expression
commaerr // like commaok, but second value is error, not boolean
cgofunc // operand is a cgo function
@ -42,7 +42,7 @@ var operandModeString = [...]string{
variable: "variable",
mapindex: "map index expression",
value: "value",
nilvalue: "nil",
nilvalue: "nil", // only used by types2
commaok: "comma, ok expression",
commaerr: "comma, error expression",
cgofunc: "cgo function",

7
src/cmd/compile/internal/types2/util.go
View File

@ -33,9 +33,10 @@ func dddErrPos(call *syntax.CallExpr) *syntax.CallExpr {
}
// argErrPos returns the node (poser) for reportign an invalid argument count.
func argErrPos(call *syntax.CallExpr) *syntax.CallExpr {
return call
}
func argErrPos(call *syntax.CallExpr) *syntax.CallExpr { return call }
// ExprString returns a string representation of x.
func ExprString(x syntax.Node) string { return syntax.String(x) }
// endPos returns the position of the first character immediately after node n.
func endPos(n syntax.Node) syntax.Pos { return syntax.EndPos(n) }

33
src/go/types/assignments.go
View File

@ -1,3 +1,5 @@
// Code generated by "go test -run=Generate -write=all"; DO NOT EDIT.
// Copyright 2013 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
@ -24,6 +26,9 @@ func (check *Checker) assignment(x *operand, T Type, context string) {
switch x.mode {
case invalid:
return // error reported before
case nilvalue:
assert(isTypes2)
// ok
case constant_, variable, mapindex, value, commaok, commaerr:
// ok
default:
@ -41,13 +46,25 @@ func (check *Checker) assignment(x *operand, T Type, context string) {
// bool, rune, int, float64, complex128 or string respectively, depending
// on whether the value is a boolean, rune, integer, floating-point,
// complex, or string constant."
if T == nil || isNonTypeParamInterface(T) {
if T == nil && x.typ == Typ[UntypedNil] {
check.errorf(x, UntypedNilUse, "use of untyped nil in %s", context)
x.mode = invalid
return
if isTypes2 {
if x.isNil() {
if T == nil {
check.errorf(x, UntypedNilUse, "use of untyped nil in %s", context)
x.mode = invalid
return
}
} else if T == nil || isNonTypeParamInterface(T) {
target = Default(x.typ)
}
} else { // go/types
if T == nil || isNonTypeParamInterface(T) {
if T == nil && x.typ == Typ[UntypedNil] {
check.errorf(x, UntypedNilUse, "use of untyped nil in %s", context)
x.mode = invalid
return
}
target = Default(x.typ)
}
target = Default(x.typ)
}
newType, val, code := check.implicitTypeAndValue(x, target)
if code != 0 {
@ -505,7 +522,7 @@ func (check *Checker) shortVarDecl(pos positioner, lhs, rhs []ast.Expr) {
ident, _ := lhs.(*ast.Ident)
if ident == nil {
check.useLHS(lhs)
// TODO(rFindley) this is redundant with a parser error. Consider omitting?
// TODO(gri) This is redundant with a go/parser error. Consider omitting in go/types?
check.errorf(lhs, BadDecl, "non-name %s on left side of :=", lhs)
hasErr = true
continue
@ -568,7 +585,7 @@ func (check *Checker) shortVarDecl(pos positioner, lhs, rhs []ast.Expr) {
// a function begins at the end of the ConstSpec or VarSpec (ShortVarDecl
// for short variable declarations) and ends at the end of the innermost
// containing block."
scopePos := rhs[len(rhs)-1].End()
scopePos := endPos(rhs[len(rhs)-1])
for _, obj := range newVars {
check.declare(scope, nil, obj, scopePos) // id = nil: recordDef already called
}

7
src/go/types/generate_test.go
View File

@ -95,7 +95,12 @@ func generate(t *testing.T, filename string, write bool) {
type action func(in *ast.File)
var filemap = map[string]action{
"alias.go": nil,
"alias.go": nil,
"assignments.go": func(f *ast.File) {
renameImportPath(f, `"cmd/compile/internal/syntax"->"go/ast"`)
renameSelectorExprs(f, "syntax.Name->ast.Ident", "ident.Value->ident.Name", "ast.Pos->token.Pos") // must happen before renaming identifiers
renameIdents(f, "syntax->ast", "poser->positioner", "nopos->noposn")
},
"array.go": nil,
"api_predicates.go": nil,
"basic.go": nil,

2
src/go/types/operand.go
View File

@ -26,6 +26,7 @@ const (
variable // operand is an addressable variable
mapindex // operand is a map index expression (acts like a variable on lhs, commaok on rhs of an assignment)
value // operand is a computed value
nilvalue // operand is the nil value - only used by types2
commaok // like value, but operand may be used in a comma,ok expression
commaerr // like commaok, but second value is error, not boolean
cgofunc // operand is a cgo function
@ -40,6 +41,7 @@ var operandModeString = [...]string{
variable: "variable",
mapindex: "map index expression",
value: "value",
nilvalue: "nil", // only used by types2
commaok: "comma, ok expression",
commaerr: "comma, error expression",
cgofunc: "cgo function",

11
src/go/types/util.go
View File

@ -30,11 +30,10 @@ func cmpPos(p, q token.Pos) int { return int(p - q) }
func hasDots(call *ast.CallExpr) bool { return call.Ellipsis.IsValid() }
// dddErrPos returns the positioner for reporting an invalid ... use in a call.
func dddErrPos(call *ast.CallExpr) positioner {
return atPos(call.Ellipsis)
}
func dddErrPos(call *ast.CallExpr) positioner { return atPos(call.Ellipsis) }
// argErrPos returns positioner for reportign an invalid argument count.
func argErrPos(call *ast.CallExpr) positioner {
return inNode(call, call.Rparen)
}
func argErrPos(call *ast.CallExpr) positioner { return inNode(call, call.Rparen) }
// endPos returns the position of the first character immediately after node n.
func endPos(n ast.Node) token.Pos { return n.End() }