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support gcexportdata export files for loading packages instead of `go…
…lang.org/x/tools/go/packages.Load`
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,91 @@ | ||
| package main | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "go/ast" | ||
| "go/build" | ||
| "go/parser" | ||
| "go/token" | ||
| "go/types" | ||
| "path/filepath" | ||
| "strings" | ||
|
|
||
| "github.com/derision-test/go-mockgen/internal" | ||
| ) | ||
|
|
||
| type archive struct { | ||
| // ImportMap refers to the actual import path to the library this archive represents. | ||
| // See https://github.com/bazelbuild/rules_go/blob/a9b312afd2866f4316356b456df1971bff6cd244/go/core.rst#go_library. | ||
| ImportMap string | ||
| File string | ||
| } | ||
|
|
||
| // The following is the format expected by this function: | ||
| // | ||
| // IMPORTMAP=EXPORT e.g. github.com/foo/bar=bar_export.a | ||
| // | ||
| // The flag is structured in this format to loosely follow https://sourcegraph.com/github.com/bazelbuild/rules_go@a9b312afd2866f4316356b456df1971bff6cd244/-/blob/go/private/actions/compilepkg.bzl?L22-29; | ||
| // however, the IMPORTPATHS section is omitted. There may be future | ||
| // work involved in resolving import aliases/vendoring using IMPORTPATHS. | ||
| func parseArchive(a string) (archive, error) { | ||
| args := strings.Split(a, "=") | ||
| if len(args) != 2 { | ||
| return archive{}, fmt.Errorf("expected 2 elements, got %d: %v", len(args), a) | ||
| } | ||
|
|
||
| return archive{ | ||
| ImportMap: args[0], | ||
| File: args[1], | ||
| }, nil | ||
| } | ||
|
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||
| func PackagesArchive(p loadParams) (packages []*internal.GoPackage, err error) { | ||
| fset := token.NewFileSet() | ||
| for _, importpath := range p.importPaths { | ||
| files := make([]*ast.File, 0, len(p.sources)) | ||
| for _, src := range p.sources[importpath] { | ||
| if ok, err := build.Default.MatchFile(filepath.Dir(src), filepath.Base(src)); err != nil { | ||
| return nil, fmt.Errorf("error checking if file matches constraints: %w", err) | ||
| } else if !ok || filepath.Ext(src) == ".s" { | ||
| fmt.Printf("skipping %q\n", src) | ||
| continue | ||
| } | ||
|
|
||
| f, err := parser.ParseFile(fset, src, nil, parser.ParseComments) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("error parsing %q: %v", src, err) | ||
| } | ||
|
|
||
| files = append(files, f) | ||
| } | ||
|
|
||
| imp, err := newImporter(fset, p.archives, p.stdlibRoot) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| conf := types.Config{Importer: imp, Error: func(err error) { | ||
| fmt.Println(err) | ||
| }} | ||
| typesInfo := &types.Info{ | ||
| Types: make(map[ast.Expr]types.TypeAndValue), | ||
| Defs: make(map[*ast.Ident]types.Object), | ||
| Uses: make(map[*ast.Ident]types.Object), | ||
| Implicits: make(map[ast.Node]types.Object), | ||
| Selections: make(map[*ast.SelectorExpr]*types.Selection), | ||
| Scopes: make(map[ast.Node]*types.Scope), | ||
| } | ||
|
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||
| pkg, err := conf.Check(importpath, fset, files, typesInfo) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("error building pkg %q: %w", importpath, err) | ||
| } | ||
| packages = append(packages, &internal.GoPackage{ | ||
| PkgPath: pkg.Path(), | ||
| CompiledGoFiles: p.sources[importpath], | ||
| Syntax: files, | ||
| Types: pkg, | ||
| TypesInfo: typesInfo, | ||
| }) | ||
| } | ||
| return | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,79 @@ | ||
| package main | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "go/token" | ||
| "go/types" | ||
| "os" | ||
| "strings" | ||
|
|
||
| "golang.org/x/tools/go/gcexportdata" | ||
| ) | ||
|
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||
| type importer struct { | ||
| importToArchive map[string]string | ||
| stdlibRoot string | ||
| fset *token.FileSet | ||
| imports map[string]*types.Package | ||
| } | ||
|
|
||
| func newImporter(fset *token.FileSet, archives []archive, root string) (types.Importer, error) { | ||
| imp := &importer{ | ||
| importToArchive: make(map[string]string, len(archives)), | ||
| fset: fset, | ||
| imports: make(map[string]*types.Package), | ||
| stdlibRoot: root, | ||
| } | ||
|
|
||
| for _, archive := range archives { | ||
| imp.importToArchive[archive.ImportMap] = archive.File | ||
| } | ||
| return imp, nil | ||
| } | ||
|
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||
| func (i *importer) Import(path string) (*types.Package, error) { | ||
| if pkg, ok := i.imports[path]; ok && pkg.Complete() { | ||
| return pkg, nil | ||
| } | ||
|
|
||
| if path == "unsafe" { | ||
| // Special case: go/types has pre-defined type information for unsafe. | ||
| // See https://github.com/golang/go/issues/13882. | ||
| return types.Unsafe, nil | ||
| } | ||
|
|
||
| if isStdlibImport(path) { | ||
| archiveFile := fmt.Sprintf("%v/%v.a", i.stdlibRoot, path) | ||
| return i.readArchive(archiveFile, path) | ||
| } | ||
|
|
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| if archive, ok := i.importToArchive[path]; ok { | ||
| return i.readArchive(archive, path) | ||
| } | ||
| return nil, fmt.Errorf("package %q not found in read archives: please double check dependencies for the go-mockgen bazel rule", path) | ||
| } | ||
|
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| func (i *importer) readArchive(archiveFile, path string) (p *types.Package, err error) { | ||
| f, err := os.Open(archiveFile) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| defer func() { f.Close() }() | ||
|
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||
| r, err := gcexportdata.NewReader(f) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
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| return gcexportdata.Read(r, i.fset, i.imports, path) | ||
| } | ||
|
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| func isStdlibImport(path string) bool { | ||
| if i := strings.IndexByte(path, '/'); i >= 0 { | ||
| path = path[:i] | ||
| } | ||
|
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||
| // If the prefix of the import path contains a ".", it should be considered | ||
| // to be a external package (not part of Go standard lib). | ||
| return !strings.Contains(path, ".") | ||
| } |
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