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.go316
1 files changed, 0 insertions, 316 deletions
diff --git a/tools/nogo/nogo.go b/tools/nogo/nogo.go
deleted file mode 100644
index 203cdf688..000000000
--- a/tools/nogo/nogo.go
+++ /dev/null
@@ -1,316 +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"
- "flag"
- "fmt"
- "go/ast"
- "go/build"
- "go/parser"
- "go/token"
- "go/types"
- "io"
- "io/ioutil"
- "log"
- "os"
- "path/filepath"
- "reflect"
-
- "golang.org/x/tools/go/analysis"
- "golang.org/x/tools/go/analysis/internal/facts"
- "golang.org/x/tools/go/gcexportdata"
- "gvisor.dev/gvisor/tools/nogo/data"
-)
-
-// pkgConfig is serialized as the configuration.
-//
-// This contains everything required for the analysis.
-type pkgConfig struct {
- ImportPath string
- GoFiles []string
- NonGoFiles []string
- Tags []string
- GOOS string
- GOARCH string
- ImportMap map[string]string
- FactMap map[string]string
- FactOutput string
- Objdump string
-}
-
-// loadFacts finds and loads facts per FactMap.
-func (c *pkgConfig) loadFacts(path string) ([]byte, error) {
- realPath, ok := c.FactMap[path]
- if !ok {
- return nil, nil // No facts available.
- }
-
- // Read the files file.
- data, err := ioutil.ReadFile(realPath)
- if err != nil {
- return nil, err
- }
- return data, nil
-}
-
-// shouldInclude indicates whether the file should be included.
-//
-// NOTE: This does only basic parsing of tags.
-func (c *pkgConfig) 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 {
- pkgConfig
- fset *token.FileSet
- cache map[string]*types.Package
-}
-
-// 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
- }
- 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(path, i.GOOS, i.GOARCH)
- } else {
- // Open the file.
- rc, err = os.Open(realPath)
- }
- if err != nil {
- 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)
-}
-
-// checkPackage runs all 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 pkgConfig) ([]string, error) {
- imp := &importer{
- pkgConfig: config,
- fset: token.NewFileSet(),
- cache: make(map[string]*types.Package),
- }
-
- // Load all source files.
- var syntax []*ast.File
- for _, file := range config.GoFiles {
- include, err := config.shouldInclude(file)
- if err != nil {
- return 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, 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 {
- return nil, fmt.Errorf("error checking types: %v", err)
- }
-
- // Load all package facts.
- facts, err := facts.Decode(types, config.loadFacts)
- if err != nil {
- return nil, fmt.Errorf("error decoding facts: %v", err)
- }
-
- // Set the binary global for use.
- data.Objdump = config.Objdump
-
- // Register fact types and establish dependencies between analyzers.
- // The visit closure will execute recursively, and populate results
- // will all required analysis results.
- diagnostics := make(map[*analysis.Analyzer][]analysis.Diagnostic)
- 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
- }
- }
-
- // Prepare the matcher.
- m := analyzerConfig[a]
- report := func(d analysis.Diagnostic) {
- if m.ShouldReport(d, imp.fset) {
- diagnostics[a] = append(diagnostics[a], d)
- }
- }
-
- // 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: report,
- 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 analysis recursively.
- for a, _ := range analyzerConfig {
- if err := visit(a); err != nil {
- return nil, err // Already has context.
- }
- }
-
- // Write the output file.
- if config.FactOutput != "" {
- factData := facts.Encode()
- if err := ioutil.WriteFile(config.FactOutput, factData, 0644); err != nil {
- return nil, fmt.Errorf("error: unable to open facts output %q: %v", config.FactOutput, err)
- }
- }
-
- // Convert all diagnostics to strings.
- findings := make([]string, 0, len(diagnostics))
- for a, ds := range diagnostics {
- for _, d := range ds {
- // Include the anlyzer name for debugability and configuration.
- findings = append(findings, fmt.Sprintf("%s: %s: %s", a.Name, imp.fset.Position(d.Pos), d.Message))
- }
- }
-
- // Return all findings.
- return findings, nil
-}
-
-var (
- configFile = flag.String("config", "", "configuration file (in JSON format)")
-)
-
-// Main is the entrypoint; it should be called directly from main.
-//
-// N.B. This package registers it's own flags.
-func Main() {
- // Parse all flags.
- flag.Parse()
-
- // Load the configuration.
- f, err := os.Open(*configFile)
- if err != nil {
- log.Fatalf("unable to open configuration %q: %v", *configFile, err)
- }
- defer f.Close()
- config := new(pkgConfig)
- dec := json.NewDecoder(f)
- dec.DisallowUnknownFields()
- if err := dec.Decode(config); err != nil {
- log.Fatalf("unable to decode configuration: %v", err)
- }
-
- // Process the package.
- findings, err := checkPackage(*config)
- if err != nil {
- log.Fatalf("error checking package: %v", err)
- }
-
- // No findings?
- if len(findings) == 0 {
- os.Exit(0)
- }
-
- // Print findings and exit with non-zero code.
- for _, finding := range findings {
- fmt.Fprintf(os.Stdout, "%s\n", finding)
- }
- os.Exit(1)
-}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-01 18:39:06 +0000