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Diffstat (limited to 'src/cmd/cgo/ast.go')
-rw-r--r--src/cmd/cgo/ast.go410
1 files changed, 0 insertions, 410 deletions
diff --git a/src/cmd/cgo/ast.go b/src/cmd/cgo/ast.go
deleted file mode 100644
index 46e33686d..000000000
--- a/src/cmd/cgo/ast.go
+++ /dev/null
@@ -1,410 +0,0 @@
-// Copyright 2009 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.
-
-// Parse input AST and prepare Prog structure.
-
-package main
-
-import (
- "fmt"
- "go/ast"
- "go/doc"
- "go/parser"
- "go/scanner"
- "go/token"
- "os"
- "strings"
-)
-
-func parse(name string, flags uint) *ast.File {
- ast1, err := parser.ParseFile(fset, name, nil, flags)
- if err != nil {
- if list, ok := err.(scanner.ErrorList); ok {
- // If err is a scanner.ErrorList, its String will print just
- // the first error and then (+n more errors).
- // Instead, turn it into a new Error that will return
- // details for all the errors.
- for _, e := range list {
- fmt.Fprintln(os.Stderr, e)
- }
- os.Exit(2)
- }
- fatalf("parsing %s: %s", name, err)
- }
- return ast1
-}
-
-func sourceLine(n ast.Node) int {
- return fset.Position(n.Pos()).Line
-}
-
-// ReadGo populates f with information learned from reading the
-// Go source file with the given file name. It gathers the C preamble
-// attached to the import "C" comment, a list of references to C.xxx,
-// a list of exported functions, and the actual AST, to be rewritten and
-// printed.
-func (f *File) ReadGo(name string) {
- // Two different parses: once with comments, once without.
- // The printer is not good enough at printing comments in the
- // right place when we start editing the AST behind its back,
- // so we use ast1 to look for the doc comments on import "C"
- // and on exported functions, and we use ast2 for translating
- // and reprinting.
- ast1 := parse(name, parser.ParseComments)
- ast2 := parse(name, 0)
-
- f.Package = ast1.Name.Name
- f.Name = make(map[string]*Name)
-
- // In ast1, find the import "C" line and get any extra C preamble.
- sawC := false
- for _, decl := range ast1.Decls {
- d, ok := decl.(*ast.GenDecl)
- if !ok {
- continue
- }
- for _, spec := range d.Specs {
- s, ok := spec.(*ast.ImportSpec)
- if !ok || string(s.Path.Value) != `"C"` {
- continue
- }
- sawC = true
- if s.Name != nil {
- error(s.Path.Pos(), `cannot rename import "C"`)
- }
- cg := s.Doc
- if cg == nil && len(d.Specs) == 1 {
- cg = d.Doc
- }
- if cg != nil {
- f.Preamble += fmt.Sprintf("#line %d %q\n", sourceLine(cg), name)
- f.Preamble += doc.CommentText(cg) + "\n"
- }
- }
- }
- if !sawC {
- error(token.NoPos, `cannot find import "C"`)
- }
-
- // In ast2, strip the import "C" line.
- w := 0
- for _, decl := range ast2.Decls {
- d, ok := decl.(*ast.GenDecl)
- if !ok {
- ast2.Decls[w] = decl
- w++
- continue
- }
- ws := 0
- for _, spec := range d.Specs {
- s, ok := spec.(*ast.ImportSpec)
- if !ok || string(s.Path.Value) != `"C"` {
- d.Specs[ws] = spec
- ws++
- }
- }
- if ws == 0 {
- continue
- }
- d.Specs = d.Specs[0:ws]
- ast2.Decls[w] = d
- w++
- }
- ast2.Decls = ast2.Decls[0:w]
-
- // Accumulate pointers to uses of C.x.
- if f.Ref == nil {
- f.Ref = make([]*Ref, 0, 8)
- }
- f.walk(ast2, "prog", (*File).saveRef)
-
- // Accumulate exported functions.
- // The comments are only on ast1 but we need to
- // save the function bodies from ast2.
- // The first walk fills in ExpFunc, and the
- // second walk changes the entries to
- // refer to ast2 instead.
- f.walk(ast1, "prog", (*File).saveExport)
- f.walk(ast2, "prog", (*File).saveExport2)
-
- f.AST = ast2
-}
-
-// Save references to C.xxx for later processing.
-func (f *File) saveRef(x interface{}, context string) {
- n, ok := x.(*ast.Expr)
- if !ok {
- return
- }
- if sel, ok := (*n).(*ast.SelectorExpr); ok {
- // For now, assume that the only instance of capital C is
- // when used as the imported package identifier.
- // The parser should take care of scoping in the future,
- // so that we will be able to distinguish a "top-level C"
- // from a local C.
- if l, ok := sel.X.(*ast.Ident); ok && l.Name == "C" {
- if context == "as2" {
- context = "expr"
- }
- goname := sel.Sel.Name
- if goname == "errno" {
- error(sel.Pos(), "cannot refer to errno directly; see documentation")
- return
- }
- name := f.Name[goname]
- if name == nil {
- name = &Name{
- Go: goname,
- }
- f.Name[goname] = name
- }
- f.Ref = append(f.Ref, &Ref{
- Name: name,
- Expr: n,
- Context: context,
- })
- return
- }
- }
-}
-
-// If a function should be exported add it to ExpFunc.
-func (f *File) saveExport(x interface{}, context string) {
- n, ok := x.(*ast.FuncDecl)
- if !ok {
- return
- }
-
- if n.Doc == nil {
- return
- }
- for _, c := range n.Doc.List {
- if !strings.HasPrefix(string(c.Text), "//export ") {
- continue
- }
-
- name := strings.TrimSpace(string(c.Text[9:]))
- if name == "" {
- error(c.Pos(), "export missing name")
- }
-
- f.ExpFunc = append(f.ExpFunc, &ExpFunc{
- Func: n,
- ExpName: name,
- })
- break
- }
-}
-
-// Make f.ExpFunc[i] point at the Func from this AST instead of the other one.
-func (f *File) saveExport2(x interface{}, context string) {
- n, ok := x.(*ast.FuncDecl)
- if !ok {
- return
- }
-
- for _, exp := range f.ExpFunc {
- if exp.Func.Name.Name == n.Name.Name {
- exp.Func = n
- break
- }
- }
-}
-
-// walk walks the AST x, calling visit(f, x, context) for each node.
-func (f *File) walk(x interface{}, context string, visit func(*File, interface{}, string)) {
- visit(f, x, context)
- switch n := x.(type) {
- case *ast.Expr:
- f.walk(*n, context, visit)
-
- // everything else just recurs
- default:
- error(token.NoPos, "unexpected type %T in walk", x, visit)
- panic("unexpected type")
-
- case nil:
-
- // These are ordered and grouped to match ../../pkg/go/ast/ast.go
- case *ast.Field:
- f.walk(&n.Type, "type", visit)
- case *ast.FieldList:
- for _, field := range n.List {
- f.walk(field, context, visit)
- }
- case *ast.BadExpr:
- case *ast.Ident:
- case *ast.Ellipsis:
- case *ast.BasicLit:
- case *ast.FuncLit:
- f.walk(n.Type, "type", visit)
- f.walk(n.Body, "stmt", visit)
- case *ast.CompositeLit:
- f.walk(&n.Type, "type", visit)
- f.walk(n.Elts, "expr", visit)
- case *ast.ParenExpr:
- f.walk(&n.X, context, visit)
- case *ast.SelectorExpr:
- f.walk(&n.X, "selector", visit)
- case *ast.IndexExpr:
- f.walk(&n.X, "expr", visit)
- f.walk(&n.Index, "expr", visit)
- case *ast.SliceExpr:
- f.walk(&n.X, "expr", visit)
- if n.Low != nil {
- f.walk(&n.Low, "expr", visit)
- }
- if n.High != nil {
- f.walk(&n.High, "expr", visit)
- }
- case *ast.TypeAssertExpr:
- f.walk(&n.X, "expr", visit)
- f.walk(&n.Type, "type", visit)
- case *ast.CallExpr:
- if context == "as2" {
- f.walk(&n.Fun, "call2", visit)
- } else {
- f.walk(&n.Fun, "call", visit)
- }
- f.walk(n.Args, "expr", visit)
- case *ast.StarExpr:
- f.walk(&n.X, context, visit)
- case *ast.UnaryExpr:
- f.walk(&n.X, "expr", visit)
- case *ast.BinaryExpr:
- f.walk(&n.X, "expr", visit)
- f.walk(&n.Y, "expr", visit)
- case *ast.KeyValueExpr:
- f.walk(&n.Key, "expr", visit)
- f.walk(&n.Value, "expr", visit)
-
- case *ast.ArrayType:
- f.walk(&n.Len, "expr", visit)
- f.walk(&n.Elt, "type", visit)
- case *ast.StructType:
- f.walk(n.Fields, "field", visit)
- case *ast.FuncType:
- f.walk(n.Params, "field", visit)
- if n.Results != nil {
- f.walk(n.Results, "field", visit)
- }
- case *ast.InterfaceType:
- f.walk(n.Methods, "field", visit)
- case *ast.MapType:
- f.walk(&n.Key, "type", visit)
- f.walk(&n.Value, "type", visit)
- case *ast.ChanType:
- f.walk(&n.Value, "type", visit)
-
- case *ast.BadStmt:
- case *ast.DeclStmt:
- f.walk(n.Decl, "decl", visit)
- case *ast.EmptyStmt:
- case *ast.LabeledStmt:
- f.walk(n.Stmt, "stmt", visit)
- case *ast.ExprStmt:
- f.walk(&n.X, "expr", visit)
- case *ast.SendStmt:
- f.walk(&n.Chan, "expr", visit)
- f.walk(&n.Value, "expr", visit)
- case *ast.IncDecStmt:
- f.walk(&n.X, "expr", visit)
- case *ast.AssignStmt:
- f.walk(n.Lhs, "expr", visit)
- if len(n.Lhs) == 2 && len(n.Rhs) == 1 {
- f.walk(n.Rhs, "as2", visit)
- } else {
- f.walk(n.Rhs, "expr", visit)
- }
- case *ast.GoStmt:
- f.walk(n.Call, "expr", visit)
- case *ast.DeferStmt:
- f.walk(n.Call, "expr", visit)
- case *ast.ReturnStmt:
- f.walk(n.Results, "expr", visit)
- case *ast.BranchStmt:
- case *ast.BlockStmt:
- f.walk(n.List, context, visit)
- case *ast.IfStmt:
- f.walk(n.Init, "stmt", visit)
- f.walk(&n.Cond, "expr", visit)
- f.walk(n.Body, "stmt", visit)
- f.walk(n.Else, "stmt", visit)
- case *ast.CaseClause:
- if context == "typeswitch" {
- context = "type"
- } else {
- context = "expr"
- }
- f.walk(n.List, context, visit)
- f.walk(n.Body, "stmt", visit)
- case *ast.SwitchStmt:
- f.walk(n.Init, "stmt", visit)
- f.walk(&n.Tag, "expr", visit)
- f.walk(n.Body, "switch", visit)
- case *ast.TypeSwitchStmt:
- f.walk(n.Init, "stmt", visit)
- f.walk(n.Assign, "stmt", visit)
- f.walk(n.Body, "typeswitch", visit)
- case *ast.CommClause:
- f.walk(n.Comm, "stmt", visit)
- f.walk(n.Body, "stmt", visit)
- case *ast.SelectStmt:
- f.walk(n.Body, "stmt", visit)
- case *ast.ForStmt:
- f.walk(n.Init, "stmt", visit)
- f.walk(&n.Cond, "expr", visit)
- f.walk(n.Post, "stmt", visit)
- f.walk(n.Body, "stmt", visit)
- case *ast.RangeStmt:
- f.walk(&n.Key, "expr", visit)
- f.walk(&n.Value, "expr", visit)
- f.walk(&n.X, "expr", visit)
- f.walk(n.Body, "stmt", visit)
-
- case *ast.ImportSpec:
- case *ast.ValueSpec:
- f.walk(&n.Type, "type", visit)
- f.walk(n.Values, "expr", visit)
- case *ast.TypeSpec:
- f.walk(&n.Type, "type", visit)
-
- case *ast.BadDecl:
- case *ast.GenDecl:
- f.walk(n.Specs, "spec", visit)
- case *ast.FuncDecl:
- if n.Recv != nil {
- f.walk(n.Recv, "field", visit)
- }
- f.walk(n.Type, "type", visit)
- if n.Body != nil {
- f.walk(n.Body, "stmt", visit)
- }
-
- case *ast.File:
- f.walk(n.Decls, "decl", visit)
-
- case *ast.Package:
- for _, file := range n.Files {
- f.walk(file, "file", visit)
- }
-
- case []ast.Decl:
- for _, d := range n {
- f.walk(d, context, visit)
- }
- case []ast.Expr:
- for i := range n {
- f.walk(&n[i], context, visit)
- }
- case []ast.Stmt:
- for _, s := range n {
- f.walk(s, context, visit)
- }
- case []ast.Spec:
- for _, s := range n {
- f.walk(s, context, visit)
- }
- }
-}
generated by cgit v1.2.3 (git 2.46.0) at 2025-10-12 18:37:02 +0000