1 files changed, 0 insertions, 418 deletions
diff --git a/tools/go_marshal/gomarshal/util.go b/tools/go_marshal/gomarshal/util.go
deleted file mode 100644
index a0936e013..000000000
--- a/tools/go_marshal/gomarshal/util.go
+++ /dev/null
@@ -1,418 +0,0 @@
-// Copyright 2019 The gVisor Authors.
-//
-// 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 gomarshal
-
-import (
-	"bytes"
-	"flag"
-	"fmt"
-	"go/ast"
-	"go/token"
-	"io"
-	"os"
-	"path"
-	"reflect"
-	"sort"
-	"strconv"
-	"strings"
-)
-
-var debug = flag.Bool("debug", false, "enables debugging output")
-
-// receiverName returns an appropriate receiver name given a type spec.
-func receiverName(t *ast.TypeSpec) string {
-	if len(t.Name.Name) < 1 {
-		// Zero length type name?
-		panic("unreachable")
-	}
-	return strings.ToLower(t.Name.Name[:1])
-}
-
-// kindString returns a user-friendly representation of an AST expr type.
-func kindString(e ast.Expr) string {
-	switch e.(type) {
-	case *ast.Ident:
-		return "scalar"
-	case *ast.ArrayType:
-		return "array"
-	case *ast.StructType:
-		return "struct"
-	case *ast.StarExpr:
-		return "pointer"
-	case *ast.FuncType:
-		return "function"
-	case *ast.InterfaceType:
-		return "interface"
-	case *ast.MapType:
-		return "map"
-	case *ast.ChanType:
-		return "channel"
-	default:
-		return reflect.TypeOf(e).String()
-	}
-}
-
-func forEachStructField(st *ast.StructType, fn func(f *ast.Field)) {
-	for _, field := range st.Fields.List {
-		fn(field)
-	}
-}
-
-// fieldDispatcher is a collection of callbacks for handling different types of
-// fields in a struct declaration.
-type fieldDispatcher struct {
-	primitive func(n, t *ast.Ident)
-	selector  func(n, tX, tSel *ast.Ident)
-	array     func(n, t *ast.Ident, size int)
-	unhandled func(n *ast.Ident)
-}
-
-// Precondition: a must have a literal for the array length. Consts and
-// expressions are not allowed as array lengths, and should be rejected by the
-// caller.
-func arrayLen(a *ast.ArrayType) int {
-	if a.Len == nil {
-		// Probably a slice? Must be handled by caller.
-		panic("Nil array length in array type")
-	}
-	lenLit, ok := a.Len.(*ast.BasicLit)
-	if !ok {
-		panic("Array has non-literal for length")
-	}
-	len, err := strconv.Atoi(lenLit.Value)
-	if err != nil {
-		panic(fmt.Sprintf("Failed to parse array length '%s' as number: %v", lenLit.Value, err))
-	}
-	return len
-}
-
-// Precondition: All dispatch callbacks that will be invoked must be
-// provided. Embedded fields are not allowed, len(f.Names) >= 1.
-func (fd fieldDispatcher) dispatch(f *ast.Field) {
-	// Each field declaration may actually be multiple declarations of the same
-	// type. For example, consider:
-	//
-	// type Point struct {
-	//     x, y, z int
-	// }
-	//
-	// We invoke the call-backs once per such instance. Embedded fields are not
-	// allowed, and results in a panic.
-	if len(f.Names) < 1 {
-		panic("Precondition not met: attempted to dispatch on embedded field")
-	}
-
-	for _, name := range f.Names {
-		switch v := f.Type.(type) {
-		case *ast.Ident:
-			fd.primitive(name, v)
-		case *ast.SelectorExpr:
-			fd.selector(name, v.X.(*ast.Ident), v.Sel)
-		case *ast.ArrayType:
-			switch t := v.Elt.(type) {
-			case *ast.Ident:
-				fd.array(name, t, arrayLen(v))
-			default:
-				// Should be handled with a better error message during validate.
-				panic(fmt.Sprintf("Array element type is of unsupported kind. Expected *ast.Ident, got %v", t))
-			}
-		default:
-			fd.unhandled(name)
-		}
-	}
-}
-
-// debugEnabled indicates whether debugging is enabled for gomarshal.
-func debugEnabled() bool {
-	return *debug
-}
-
-// abort aborts the go_marshal tool with the given error message.
-func abort(msg string) {
-	if !strings.HasSuffix(msg, "\n") {
-		msg += "\n"
-	}
-	fmt.Print(msg)
-	os.Exit(1)
-}
-
-// abortAt aborts the go_marshal tool with the given error message, with
-// a reference position to the input source.
-func abortAt(p token.Position, msg string) {
-	abort(fmt.Sprintf("%v:\n  %s\n", p, msg))
-}
-
-// debugf conditionally prints a debug message.
-func debugf(f string, a ...interface{}) {
-	if debugEnabled() {
-		fmt.Printf(f, a...)
-	}
-}
-
-// debugfAt conditionally prints a debug message with a reference to a position
-// in the input source.
-func debugfAt(p token.Position, f string, a ...interface{}) {
-	if debugEnabled() {
-		fmt.Printf("%s:\n  %s", p, fmt.Sprintf(f, a...))
-	}
-}
-
-// emit generates a line of code in the output file.
-//
-// emit is a wrapper around writing a formatted string to the output
-// buffer. emit can be invoked in one of two ways:
-//
-// (1) emit("some string")
-//     When emit is called with a single string argument, it is simply copied to
-//     the output buffer without any further formatting.
-// (2) emit(fmtString, args...)
-//     emit can also be invoked in a similar fashion to *Printf() functions,
-//     where the first argument is a format string.
-//
-// Calling emit with a single argument that is not a string will result in a
-// panic, as the caller's intent is ambiguous.
-func emit(out io.Writer, indent int, a ...interface{}) {
-	const spacesPerIndentLevel = 4
-
-	if len(a) < 1 {
-		panic("emit() called with no arguments")
-	}
-
-	if indent > 0 {
-		if _, err := fmt.Fprint(out, strings.Repeat(" ", indent*spacesPerIndentLevel)); err != nil {
-			// Writing to the emit output should not fail. Typically the output
-			// is a byte.Buffer; writes to these never fail.
-			panic(err)
-		}
-	}
-
-	first, ok := a[0].(string)
-	if !ok {
-		// First argument must be either the string to emit (case 1 from
-		// function-level comment), or a format string (case 2).
-		panic(fmt.Sprintf("First argument to emit() is not a string: %+v", a[0]))
-	}
-
-	if len(a) == 1 {
-		// Single string argument. Assume no formatting requested.
-		if _, err := fmt.Fprint(out, first); err != nil {
-			// Writing to out should not fail.
-			panic(err)
-		}
-		return
-
-	}
-
-	// Formatting requested.
-	if _, err := fmt.Fprintf(out, first, a[1:]...); err != nil {
-		// Writing to out should not fail.
-		panic(err)
-	}
-}
-
-// sourceBuffer represents fragments of generated go source code.
-//
-// sourceBuffer provides a convenient way to build up go souce fragments in
-// memory. May be safely zero-value initialized. Not thread-safe.
-type sourceBuffer struct {
-	// Current indentation level.
-	indent int
-
-	// Memory buffer containing contents while they're being generated.
-	b bytes.Buffer
-}
-
-func (b *sourceBuffer) reset() {
-	b.indent = 0
-	b.b.Reset()
-}
-
-func (b *sourceBuffer) incIndent() {
-	b.indent++
-}
-
-func (b *sourceBuffer) decIndent() {
-	if b.indent <= 0 {
-		panic("decIndent() without matching incIndent()")
-	}
-	b.indent--
-}
-
-func (b *sourceBuffer) emit(a ...interface{}) {
-	emit(&b.b, b.indent, a...)
-}
-
-func (b *sourceBuffer) emitNoIndent(a ...interface{}) {
-	emit(&b.b, 0 /*indent*/, a...)
-}
-
-func (b *sourceBuffer) inIndent(body func()) {
-	b.incIndent()
-	body()
-	b.decIndent()
-}
-
-func (b *sourceBuffer) write(out io.Writer) error {
-	_, err := fmt.Fprint(out, b.b.String())
-	return err
-}
-
-// Write implements io.Writer.Write.
-func (b *sourceBuffer) Write(buf []byte) (int, error) {
-	return (b.b.Write(buf))
-}
-
-// importStmt represents a single import statement.
-type importStmt struct {
-	// Local name of the imported package.
-	name string
-	// Import path.
-	path string
-	// Indicates whether the local name is an alias, or simply the final
-	// component of the path.
-	aliased bool
-	// Indicates whether this import was referenced by generated code.
-	used bool
-}
-
-func newImport(p string) *importStmt {
-	name := path.Base(p)
-	return &importStmt{
-		name:    name,
-		path:    p,
-		aliased: false,
-	}
-}
-
-func newImportFromSpec(spec *ast.ImportSpec, f *token.FileSet) *importStmt {
-	p := spec.Path.Value[1 : len(spec.Path.Value)-1] // Strip the " quotes around path.
-	name := path.Base(p)
-	if name == "" || name == "/" || name == "." {
-		panic(fmt.Sprintf("Couldn't process local package name for import at %s, (processed as %s)",
-			f.Position(spec.Path.Pos()), name))
-	}
-	if spec.Name != nil {
-		name = spec.Name.Name
-	}
-	return &importStmt{
-		name:    name,
-		path:    p,
-		aliased: spec.Name != nil,
-	}
-}
-
-func (i *importStmt) String() string {
-	if i.aliased {
-		return fmt.Sprintf("%s \"%s\"", i.name, i.path)
-	}
-	return fmt.Sprintf("\"%s\"", i.path)
-}
-
-func (i *importStmt) markUsed() {
-	i.used = true
-}
-
-func (i *importStmt) equivalent(other *importStmt) bool {
-	return i.name == other.name && i.path == other.path && i.aliased == other.aliased
-}
-
-// importTable represents a collection of importStmts.
-type importTable struct {
-	// Map of imports and whether they should be copied to the output.
-	is map[string]*importStmt
-}
-
-func newImportTable() *importTable {
-	return &importTable{
-		is: make(map[string]*importStmt),
-	}
-}
-
-// Merges import statements from other into i. Collisions in import statements
-// result in a panic.
-func (i *importTable) merge(other *importTable) {
-	for name, im := range other.is {
-		if dup, ok := i.is[name]; ok && !dup.equivalent(im) {
-			panic(fmt.Sprintf("Found colliding import statements: ours: %+v, other's: %+v", dup, im))
-		}
-
-		i.is[name] = im
-	}
-}
-
-func (i *importTable) addStmt(s *importStmt) *importStmt {
-	if old, ok := i.is[s.name]; ok && !old.equivalent(s) {
-		// A collision should always be between an import inserted by the
-		// go-marshal tool and an import from the original source file (assuming
-		// the original source file was valid). We could theoretically handle
-		// the collision by assigning a local name to our import. However, this
-		// would need to be plumbed throughout the generator. Given that
-		// collisions should be rare, simply panic on collision.
-		panic(fmt.Sprintf("Import collision: old: %s as %v; new: %v as %v", old.path, old.name, s.path, s.name))
-	}
-	i.is[s.name] = s
-	return s
-}
-
-func (i *importTable) add(s string) *importStmt {
-	n := newImport(s)
-	return i.addStmt(n)
-}
-
-func (i *importTable) addFromSpec(spec *ast.ImportSpec, f *token.FileSet) *importStmt {
-	return i.addStmt(newImportFromSpec(spec, f))
-}
-
-// Marks the import named n as used. If no such import is in the table, returns
-// false.
-func (i *importTable) markUsed(n string) bool {
-	if n, ok := i.is[n]; ok {
-		n.markUsed()
-		return true
-	}
-	return false
-}
-
-func (i *importTable) clear() {
-	for _, i := range i.is {
-		i.used = false
-	}
-}
-
-func (i *importTable) write(out io.Writer) error {
-	if len(i.is) == 0 {
-		// Nothing to import, we're done.
-		return nil
-	}
-
-	imports := make([]string, 0, len(i.is))
-	for _, i := range i.is {
-		if i.used {
-			imports = append(imports, i.String())
-		}
-	}
-	sort.Strings(imports)
-
-	var b sourceBuffer
-	b.emit("import (\n")
-	b.incIndent()
-	for _, i := range imports {
-		b.emit("%s\n", i)
-	}
-	b.decIndent()
-	b.emit(")\n\n")
-
-	return b.write(out)
-}