summaryrefslogtreecommitdiffhomepage
path: root/tools/nogo/nogo.go
diff options
context:
space:
mode:
Diffstat (limited to 'tools/nogo/nogo.go')
-rw-r--r--tools/nogo/nogo.go473
1 files changed, 0 insertions, 473 deletions
diff --git a/tools/nogo/nogo.go b/tools/nogo/nogo.go
deleted file mode 100644
index 779d4d6d8..000000000
--- a/tools/nogo/nogo.go
+++ /dev/null
@@ -1,473 +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 nogo implements binary analysis similar to bazel's nogo,
-// or the unitchecker package. It exists in order to provide additional
-// facilities for analysis, namely plumbing through the output from
-// dumping the generated binary (to analyze actual produced code).
-package nogo
-
-import (
- "encoding/json"
- "errors"
- "fmt"
- "go/ast"
- "go/build"
- "go/parser"
- "go/token"
- "go/types"
- "io"
- "io/ioutil"
- "log"
- "os"
- "path"
- "path/filepath"
- "reflect"
- "strings"
-
- "golang.org/x/tools/go/analysis"
- "golang.org/x/tools/go/analysis/internal/facts"
- "golang.org/x/tools/go/gcexportdata"
-
- // Special case: flags live here and change overall behavior.
- "gvisor.dev/gvisor/tools/checkescape"
-)
-
-// StdlibConfig is serialized as the configuration.
-//
-// This contains everything required for stdlib analysis.
-type StdlibConfig struct {
- Srcs []string
- GOOS string
- GOARCH string
- Tags []string
-}
-
-// PackageConfig is serialized as the configuration.
-//
-// This contains everything required for single package analysis.
-type PackageConfig struct {
- ImportPath string
- GoFiles []string
- NonGoFiles []string
- Tags []string
- GOOS string
- GOARCH string
- ImportMap map[string]string
- FactMap map[string]string
- StdlibFacts string
-}
-
-// loader is a fact-loader function.
-type loader func(string) ([]byte, error)
-
-// saver is a fact-saver function.
-type saver func([]byte) error
-
-// factLoader returns a function that loads facts.
-//
-// This resolves all standard library facts and imported package facts up
-// front. The returned loader function will never return an error, only
-// empty facts.
-//
-// This is done because all stdlib data is stored together, and we don't want
-// to load this data many times over.
-func (c *PackageConfig) factLoader() (loader, error) {
- allFacts := make(map[string][]byte)
- if c.StdlibFacts != "" {
- data, err := ioutil.ReadFile(c.StdlibFacts)
- if err != nil {
- return nil, fmt.Errorf("error loading stdlib facts from %q: %w", c.StdlibFacts, err)
- }
- var stdlibFacts map[string][]byte
- if err := json.Unmarshal(data, &stdlibFacts); err != nil {
- return nil, fmt.Errorf("error loading stdlib facts: %w", err)
- }
- for pkg, data := range stdlibFacts {
- allFacts[pkg] = data
- }
- }
- for pkg, file := range c.FactMap {
- data, err := ioutil.ReadFile(file)
- if err != nil {
- return nil, fmt.Errorf("error loading %q: %w", file, err)
- }
- allFacts[pkg] = data
- }
- return func(path string) ([]byte, error) {
- return allFacts[path], nil
- }, nil
-}
-
-// shouldInclude indicates whether the file should be included.
-//
-// NOTE: This does only basic parsing of tags.
-func (c *PackageConfig) shouldInclude(path string) (bool, error) {
- ctx := build.Default
- ctx.GOOS = c.GOOS
- ctx.GOARCH = c.GOARCH
- ctx.BuildTags = c.Tags
- return ctx.MatchFile(filepath.Dir(path), filepath.Base(path))
-}
-
-// importer is an implementation of go/types.Importer.
-//
-// This wraps a configuration, which provides the map of package names to
-// files, and the facts. Note that this importer implementation will always
-// pass when a given package is not available.
-type importer struct {
- *PackageConfig
- fset *token.FileSet
- cache map[string]*types.Package
- lastErr error
- callback func(string) error
-}
-
-// Import implements types.Importer.Import.
-func (i *importer) Import(path string) (*types.Package, error) {
- if path == "unsafe" {
- // Special case: go/types has pre-defined type information for
- // unsafe. We ensure that this package is correct, in case any
- // analyzers are specifically looking for this.
- return types.Unsafe, nil
- }
-
- // Call the internal callback. This is used to resolve loading order
- // for the standard library. See checkStdlib.
- if i.callback != nil {
- if err := i.callback(path); err != nil {
- i.lastErr = err
- return nil, err
- }
- }
-
- // Actually load the data.
- realPath, ok := i.ImportMap[path]
- var (
- rc io.ReadCloser
- err error
- )
- if !ok {
- // Not found in the import path. Attempt to find the package
- // via the standard library.
- rc, err = findStdPkg(i.GOOS, i.GOARCH, path)
- } else {
- // Open the file.
- rc, err = os.Open(realPath)
- }
- if err != nil {
- i.lastErr = err
- return nil, err
- }
- defer rc.Close()
-
- // Load all exported data.
- r, err := gcexportdata.NewReader(rc)
- if err != nil {
- return nil, err
- }
-
- return gcexportdata.Read(r, i.fset, i.cache, path)
-}
-
-// ErrSkip indicates the package should be skipped.
-var ErrSkip = errors.New("skipped")
-
-// CheckStdlib checks the standard library.
-//
-// This constructs a synthetic package configuration for each library in the
-// standard library sources, and call CheckPackage repeatedly.
-//
-// Note that not all parts of the source are expected to build. We skip obvious
-// test files, and cmd files, which should not be dependencies.
-func CheckStdlib(config *StdlibConfig, analyzers []*analysis.Analyzer) (allFindings []Finding, facts []byte, err error) {
- if len(config.Srcs) == 0 {
- return nil, nil, nil
- }
-
- // Ensure all paths are normalized.
- for i := 0; i < len(config.Srcs); i++ {
- config.Srcs[i] = path.Clean(config.Srcs[i])
- }
-
- // Calculate the root source directory. This is always a directory
- // named 'src', of which we simply take the first we find. This is a
- // bit fragile, but works for all currently known Go source
- // configurations.
- //
- // Note that there may be extra files outside of the root source
- // directory; we simply ignore those.
- rootSrcPrefix := ""
- for _, file := range config.Srcs {
- const src = "/src/"
- i := strings.Index(file, src)
- if i == -1 {
- // Superfluous file.
- continue
- }
-
- // Index of first character after /src/.
- i += len(src)
- rootSrcPrefix = file[:i]
- break
- }
-
- // Aggregate all files by directory.
- packages := make(map[string]*PackageConfig)
- for _, file := range config.Srcs {
- if !strings.HasPrefix(file, rootSrcPrefix) {
- // Superflouous file.
- continue
- }
-
- d := path.Dir(file)
- if len(rootSrcPrefix) >= len(d) {
- continue // Not a file.
- }
- pkg := d[len(rootSrcPrefix):]
- // Skip cmd packages and obvious test files: see above.
- if strings.HasPrefix(pkg, "cmd/") || strings.HasSuffix(file, "_test.go") {
- continue
- }
- c, ok := packages[pkg]
- if !ok {
- c = &PackageConfig{
- ImportPath: pkg,
- GOOS: config.GOOS,
- GOARCH: config.GOARCH,
- Tags: config.Tags,
- }
- packages[pkg] = c
- }
- // Add the files appropriately. Note that they will be further
- // filtered by architecture and build tags below, so this need
- // not be done immediately.
- if strings.HasSuffix(file, ".go") {
- c.GoFiles = append(c.GoFiles, file)
- } else {
- c.NonGoFiles = append(c.NonGoFiles, file)
- }
- }
-
- // Closure to check a single package.
- stdlibFacts := make(map[string][]byte)
- stdlibErrs := make(map[string]error)
- var checkOne func(pkg string) error // Recursive.
- checkOne = func(pkg string) error {
- // Is this already done?
- if _, ok := stdlibFacts[pkg]; ok {
- return nil
- }
- // Did this fail previously?
- if _, ok := stdlibErrs[pkg]; ok {
- return nil
- }
-
- // Lookup the configuration.
- config, ok := packages[pkg]
- if !ok {
- return nil // Not known.
- }
-
- // Find the binary package, and provide to objdump.
- rc, err := findStdPkg(config.GOOS, config.GOARCH, pkg)
- if err != nil {
- // If there's no binary for this package, it is likely
- // not built with the distribution. That's fine, we can
- // just skip analysis.
- stdlibErrs[pkg] = err
- return nil
- }
-
- // Provide the input.
- oldReader := checkescape.Reader
- checkescape.Reader = rc // For analysis.
- defer func() {
- rc.Close()
- checkescape.Reader = oldReader // Restore.
- }()
-
- // Run the analysis.
- findings, factData, err := CheckPackage(config, analyzers, checkOne)
- if err != nil {
- // If we can't analyze a package from the standard library,
- // then we skip it. It will simply not have any findings.
- stdlibErrs[pkg] = err
- return nil
- }
- stdlibFacts[pkg] = factData
- allFindings = append(allFindings, findings...)
- return nil
- }
-
- // Check all packages.
- //
- // Note that this may call checkOne recursively, so it's not guaranteed
- // to evaluate in the order provided here. We do ensure however, that
- // all packages are evaluated.
- for pkg := range packages {
- if err := checkOne(pkg); err != nil {
- return nil, nil, err
- }
- }
-
- // Sanity check.
- if len(stdlibFacts) == 0 {
- return nil, nil, fmt.Errorf("no stdlib facts found: misconfiguration?")
- }
-
- // Write out all findings.
- factData, err := json.Marshal(stdlibFacts)
- if err != nil {
- return nil, nil, fmt.Errorf("error saving stdlib facts: %w", err)
- }
-
- // Write out all errors.
- for pkg, err := range stdlibErrs {
- log.Printf("WARNING: error while processing %v: %v", pkg, err)
- }
-
- // Return all findings.
- return allFindings, factData, nil
-}
-
-// CheckPackage runs all given analyzers.
-//
-// The implementation was adapted from [1], which was in turn adpated from [2].
-// This returns a list of matching analysis issues, or an error if the analysis
-// could not be completed.
-//
-// [1] bazelbuid/rules_go/tools/builders/nogo_main.go
-// [2] golang.org/x/tools/go/checker/internal/checker
-func CheckPackage(config *PackageConfig, analyzers []*analysis.Analyzer, importCallback func(string) error) (findings []Finding, factData []byte, err error) {
- imp := &importer{
- PackageConfig: config,
- fset: token.NewFileSet(),
- cache: make(map[string]*types.Package),
- callback: importCallback,
- }
-
- // Load all source files.
- var syntax []*ast.File
- for _, file := range config.GoFiles {
- include, err := config.shouldInclude(file)
- if err != nil {
- return nil, nil, fmt.Errorf("error evaluating file %q: %v", file, err)
- }
- if !include {
- continue
- }
- s, err := parser.ParseFile(imp.fset, file, nil, parser.ParseComments)
- if err != nil {
- return nil, nil, fmt.Errorf("error parsing file %q: %v", file, err)
- }
- syntax = append(syntax, s)
- }
-
- // Check type information.
- typesSizes := types.SizesFor("gc", config.GOARCH)
- typeConfig := types.Config{Importer: imp}
- typesInfo := &types.Info{
- Types: make(map[ast.Expr]types.TypeAndValue),
- Uses: make(map[*ast.Ident]types.Object),
- Defs: make(map[*ast.Ident]types.Object),
- Implicits: make(map[ast.Node]types.Object),
- Scopes: make(map[ast.Node]*types.Scope),
- Selections: make(map[*ast.SelectorExpr]*types.Selection),
- }
- types, err := typeConfig.Check(config.ImportPath, imp.fset, syntax, typesInfo)
- if err != nil && imp.lastErr != ErrSkip {
- return nil, nil, fmt.Errorf("error checking types: %w", err)
- }
-
- // Load all package facts.
- loader, err := config.factLoader()
- if err != nil {
- return nil, nil, fmt.Errorf("error loading facts: %w", err)
- }
- facts, err := facts.Decode(types, loader)
- if err != nil {
- return nil, nil, fmt.Errorf("error decoding facts: %w", err)
- }
-
- // Register fact types and establish dependencies between analyzers.
- // The visit closure will execute recursively, and populate results
- // will all required analysis results.
- results := make(map[*analysis.Analyzer]interface{})
- var visit func(*analysis.Analyzer) error // For recursion.
- visit = func(a *analysis.Analyzer) error {
- if _, ok := results[a]; ok {
- return nil
- }
-
- // Run recursively for all dependencies.
- for _, req := range a.Requires {
- if err := visit(req); err != nil {
- return err
- }
- }
-
- // Run the analysis.
- factFilter := make(map[reflect.Type]bool)
- for _, f := range a.FactTypes {
- factFilter[reflect.TypeOf(f)] = true
- }
- p := &analysis.Pass{
- Analyzer: a,
- Fset: imp.fset,
- Files: syntax,
- Pkg: types,
- TypesInfo: typesInfo,
- ResultOf: results, // All results.
- Report: func(d analysis.Diagnostic) {
- findings = append(findings, Finding{
- Category: AnalyzerName(a.Name),
- Position: imp.fset.Position(d.Pos),
- Message: d.Message,
- })
- },
- ImportPackageFact: facts.ImportPackageFact,
- ExportPackageFact: facts.ExportPackageFact,
- ImportObjectFact: facts.ImportObjectFact,
- ExportObjectFact: facts.ExportObjectFact,
- AllPackageFacts: func() []analysis.PackageFact { return facts.AllPackageFacts(factFilter) },
- AllObjectFacts: func() []analysis.ObjectFact { return facts.AllObjectFacts(factFilter) },
- TypesSizes: typesSizes,
- }
- result, err := a.Run(p)
- if err != nil {
- return fmt.Errorf("error running analysis %s: %v", a, err)
- }
-
- // Sanity check & save the result.
- if got, want := reflect.TypeOf(result), a.ResultType; got != want {
- return fmt.Errorf("error: analyzer %s returned a result of type %v, but declared ResultType %v", a, got, want)
- }
- results[a] = result
- return nil // Success.
- }
-
- // Visit all analyzers recursively.
- for _, a := range analyzers {
- if imp.lastErr == ErrSkip {
- continue // No local analysis.
- }
- if err := visit(a); err != nil {
- return nil, nil, err // Already has context.
- }
- }
-
- // Return all findings.
- return findings, facts.Encode(), nil
-}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-06 02:50:21 +0000