1 files changed, 0 insertions, 378 deletions
diff --git a/tools/go_marshal/gomarshal/generator.go b/tools/go_marshal/gomarshal/generator.go
deleted file mode 100644
index 8392f3f6d..000000000
--- a/tools/go_marshal/gomarshal/generator.go
+++ /dev/null
@@ -1,378 +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 implements the go_marshal code generator. See README.md.
-package gomarshal
-
-import (
-	"bytes"
-	"fmt"
-	"go/ast"
-	"go/parser"
-	"go/token"
-	"os"
-	"sort"
-)
-
-const (
-	marshalImport  = "gvisor.dev/gvisor/tools/go_marshal/marshal"
-	usermemImport  = "gvisor.dev/gvisor/pkg/sentry/usermem"
-	safecopyImport = "gvisor.dev/gvisor/pkg/sentry/platform/safecopy"
-)
-
-// List of identifiers we use in generated code, that may conflict a
-// similarly-named source identifier. Avoid problems by refusing the generate
-// code when we see these.
-//
-// This only applies to import aliases at the moment. All other identifiers
-// are qualified by a receiver argument, since they're struct fields.
-//
-// All recievers are single letters, so we don't allow import aliases to be a
-// single letter.
-var badIdents = []string{
-	"src", "srcs", "dst", "dsts", "blk", "buf", "err",
-	// All single-letter identifiers.
-}
-
-// Generator drives code generation for a single invocation of the go_marshal
-// utility.
-//
-// The Generator holds arguments passed to the tool, and drives parsing,
-// processing and code Generator for all types marked with +marshal declared in
-// the input files.
-//
-// See Generator.run() as the entry point.
-type Generator struct {
-	// Paths to input go source files.
-	inputs []string
-	// Output file to write generated go source.
-	output *os.File
-	// Output file to write generated tests.
-	outputTest *os.File
-	// Package name for the generated file.
-	pkg string
-	// Set of extra packages to import in the generated file.
-	imports *importTable
-}
-
-// NewGenerator creates a new code Generator.
-func NewGenerator(srcs []string, out, outTest, pkg string, imports []string) (*Generator, error) {
-	f, err := os.OpenFile(out, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, 0644)
-	if err != nil {
-		return nil, fmt.Errorf("Couldn't open output file %q: %v", out, err)
-	}
-	fTest, err := os.OpenFile(outTest, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, 0644)
-	if err != nil {
-		return nil, fmt.Errorf("Couldn't open test output file %q: %v", out, err)
-	}
-	g := Generator{
-		inputs:     srcs,
-		output:     f,
-		outputTest: fTest,
-		pkg:        pkg,
-		imports:    newImportTable(),
-	}
-	for _, i := range imports {
-		// All imports on the extra imports list are unconditionally marked as
-		// used, so they're always added to the generated code.
-		g.imports.add(i).markUsed()
-	}
-	g.imports.add(marshalImport).markUsed()
-	// The follow imports may or may not be used by the generated
-	// code, depending what's required for the target types. Don't
-	// mark these imports as used by default.
-	g.imports.add(usermemImport)
-	g.imports.add(safecopyImport)
-	g.imports.add("unsafe")
-
-	return &g, nil
-}
-
-// writeHeader writes the header for the generated source file. The header
-// includes the package name, package level comments and import statements.
-func (g *Generator) writeHeader() error {
-	var b sourceBuffer
-	b.emit("// Automatically generated marshal implementation. See tools/go_marshal.\n\n")
-	b.emit("package %s\n\n", g.pkg)
-	if err := b.write(g.output); err != nil {
-		return err
-	}
-
-	return g.imports.write(g.output)
-}
-
-// writeTypeChecks writes a statement to force the compiler to perform a type
-// check for all Marshallable types referenced by the generated code.
-func (g *Generator) writeTypeChecks(ms map[string]struct{}) error {
-	if len(ms) == 0 {
-		return nil
-	}
-
-	msl := make([]string, 0, len(ms))
-	for m, _ := range ms {
-		msl = append(msl, m)
-	}
-	sort.Strings(msl)
-
-	var buf bytes.Buffer
-	fmt.Fprint(&buf, "// Marshallable types used by this file.\n")
-
-	for _, m := range msl {
-		fmt.Fprintf(&buf, "var _ marshal.Marshallable = (*%s)(nil)\n", m)
-	}
-	fmt.Fprint(&buf, "\n")
-
-	_, err := fmt.Fprint(g.output, buf.String())
-	return err
-}
-
-// parse processes all input files passed this generator and produces a set of
-// parsed go ASTs.
-func (g *Generator) parse() ([]*ast.File, []*token.FileSet, error) {
-	debugf("go_marshal invoked with %d input files:\n", len(g.inputs))
-	for _, path := range g.inputs {
-		debugf("  %s\n", path)
-	}
-
-	files := make([]*ast.File, 0, len(g.inputs))
-	fsets := make([]*token.FileSet, 0, len(g.inputs))
-
-	for _, path := range g.inputs {
-		fset := token.NewFileSet()
-		f, err := parser.ParseFile(fset, path, nil, parser.ParseComments)
-		if err != nil {
-			// Not a valid input file?
-			return nil, nil, fmt.Errorf("Input %q can't be parsed: %v", path, err)
-		}
-
-		if debugEnabled() {
-			debugf("AST for %q:\n", path)
-			ast.Print(fset, f)
-		}
-
-		files = append(files, f)
-		fsets = append(fsets, fset)
-	}
-
-	return files, fsets, nil
-}
-
-// collectMarshallabeTypes walks the parsed AST and collects a list of type
-// declarations for which we need to generate the Marshallable interface.
-func (g *Generator) collectMarshallabeTypes(a *ast.File, f *token.FileSet) []*ast.TypeSpec {
-	var types []*ast.TypeSpec
-	for _, decl := range a.Decls {
-		gdecl, ok := decl.(*ast.GenDecl)
-		// Type declaration?
-		if !ok || gdecl.Tok != token.TYPE {
-			debugfAt(f.Position(decl.Pos()), "Skipping declaration since it's not a type declaration.\n")
-			continue
-		}
-		// Does it have a comment?
-		if gdecl.Doc == nil {
-			debugfAt(f.Position(gdecl.Pos()), "Skipping declaration since it doesn't have a comment.\n")
-			continue
-		}
-		// Does the comment contain a "+marshal" line?
-		marked := false
-		for _, c := range gdecl.Doc.List {
-			if c.Text == "// +marshal" {
-				marked = true
-				break
-			}
-		}
-		if !marked {
-			debugfAt(f.Position(gdecl.Pos()), "Skipping declaration since it doesn't have a comment containing +marshal line.\n")
-			continue
-		}
-		for _, spec := range gdecl.Specs {
-			// We already confirmed we're in a type declaration earlier.
-			t := spec.(*ast.TypeSpec)
-			if _, ok := t.Type.(*ast.StructType); ok {
-				debugfAt(f.Position(t.Pos()), "Collected marshallable type %s.\n", t.Name.Name)
-				types = append(types, t)
-				continue
-			}
-			debugf("Skipping declaration %v since it's not a struct declaration.\n", gdecl)
-		}
-	}
-	return types
-}
-
-// collectImports collects all imports from all input source files. Some of
-// these imports are copied to the generated output, if they're referenced by
-// the generated code.
-//
-// collectImports de-duplicates imports while building the list, and ensures
-// identifiers in the generated code don't conflict with any imported package
-// names.
-func (g *Generator) collectImports(a *ast.File, f *token.FileSet) map[string]importStmt {
-	badImportNames := make(map[string]bool)
-	for _, i := range badIdents {
-		badImportNames[i] = true
-	}
-
-	is := make(map[string]importStmt)
-	for _, decl := range a.Decls {
-		gdecl, ok := decl.(*ast.GenDecl)
-		// Import statement?
-		if !ok || gdecl.Tok != token.IMPORT {
-			continue
-		}
-		for _, spec := range gdecl.Specs {
-			i := g.imports.addFromSpec(spec.(*ast.ImportSpec), f)
-			debugf("Collected import '%s' as '%s'\n", i.path, i.name)
-
-			// Make sure we have an import that doesn't use any local names that
-			// would conflict with identifiers in the generated code.
-			if len(i.name) == 1 {
-				abortAt(f.Position(spec.Pos()), fmt.Sprintf("Import has a single character local name '%s'; this may conflict with code generated by go_marshal, use a multi-character import alias", i.name))
-			}
-			if badImportNames[i.name] {
-				abortAt(f.Position(spec.Pos()), fmt.Sprintf("Import name '%s' is likely to conflict with code generated by go_marshal, use a different import alias", i.name))
-			}
-		}
-	}
-	return is
-
-}
-
-func (g *Generator) generateOne(t *ast.TypeSpec, fset *token.FileSet) *interfaceGenerator {
-	// We're guaranteed to have only struct type specs by now. See
-	// Generator.collectMarshallabeTypes.
-	i := newInterfaceGenerator(t, fset)
-	i.validate()
-	i.emitMarshallable()
-	return i
-}
-
-// generateOneTestSuite generates a test suite for the automatically generated
-// implementations type t.
-func (g *Generator) generateOneTestSuite(t *ast.TypeSpec) *testGenerator {
-	i := newTestGenerator(t)
-	i.emitTests()
-	return i
-}
-
-// Run is the entry point to code generation using g.
-//
-// Run parses all input source files specified in g and emits generated code.
-func (g *Generator) Run() error {
-	// Parse our input source files into ASTs and token sets.
-	asts, fsets, err := g.parse()
-	if err != nil {
-		return err
-	}
-
-	if len(asts) != len(fsets) {
-		panic("ASTs and FileSets don't match")
-	}
-
-	// Map of imports in source files; key = local package name, value = import
-	// path.
-	is := make(map[string]importStmt)
-	for i, a := range asts {
-		// Collect all imports from the source files. We may need to copy some
-		// of these to the generated code if they're referenced. This has to be
-		// done before the loop below because we need to process all ASTs before
-		// we start requesting imports to be copied one by one as we encounter
-		// them in each generated source.
-		for name, i := range g.collectImports(a, fsets[i]) {
-			is[name] = i
-		}
-	}
-
-	var impls []*interfaceGenerator
-	var ts []*testGenerator
-	// Set of Marshallable types referenced by generated code.
-	ms := make(map[string]struct{})
-	for i, a := range asts {
-		// Collect type declarations marked for code generation and generate
-		// Marshallable interfaces.
-		for _, t := range g.collectMarshallabeTypes(a, fsets[i]) {
-			impl := g.generateOne(t, fsets[i])
-			// Collect Marshallable types referenced by the generated code.
-			for ref, _ := range impl.ms {
-				ms[ref] = struct{}{}
-			}
-			impls = append(impls, impl)
-			// Collect imports referenced by the generated code and add them to
-			// the list of imports we need to copy to the generated code.
-			for name, _ := range impl.is {
-				if !g.imports.markUsed(name) {
-					panic(fmt.Sprintf("Generated code for '%s' referenced a non-existent import with local name '%s'", impl.typeName(), name))
-				}
-			}
-			ts = append(ts, g.generateOneTestSuite(t))
-		}
-	}
-
-	// Tool was invoked with input files with no data structures marked for code
-	// generation. This is probably not what the user intended.
-	if len(impls) == 0 {
-		var buf bytes.Buffer
-		fmt.Fprintf(&buf, "go_marshal invoked on these files, but they don't contain any types requiring code generation. Perhaps mark some with \"// +marshal\"?:\n")
-		for _, i := range g.inputs {
-			fmt.Fprintf(&buf, "  %s\n", i)
-		}
-		abort(buf.String())
-	}
-
-	// Write output file header. These include things like package name and
-	// import statements.
-	if err := g.writeHeader(); err != nil {
-		return err
-	}
-
-	// Write type checks for referenced marshallable types to output file.
-	if err := g.writeTypeChecks(ms); err != nil {
-		return err
-	}
-
-	// Write generated interfaces to output file.
-	for _, i := range impls {
-		if err := i.write(g.output); err != nil {
-			return err
-		}
-	}
-
-	// Write generated tests to test file.
-	return g.writeTests(ts)
-}
-
-// writeTests outputs tests for the generated interface implementations to a go
-// source file.
-func (g *Generator) writeTests(ts []*testGenerator) error {
-	var b sourceBuffer
-	b.emit("package %s\n\n", g.pkg)
-	if err := b.write(g.outputTest); err != nil {
-		return err
-	}
-
-	imports := newImportTable()
-	for _, t := range ts {
-		imports.merge(t.imports)
-	}
-
-	if err := imports.write(g.outputTest); err != nil {
-		return err
-	}
-
-	for _, t := range ts {
-		if err := t.write(g.outputTest); err != nil {
-			return err
-		}
-	}
-	return nil
-}