| // Copyright 2015 The Go Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style |
| // license that can be found in the LICENSE file. |
| |
| package main |
| |
| import ( |
| "fmt" |
| "go/ast" |
| "go/build" |
| "go/importer" |
| "go/token" |
| "go/types" |
| "io" |
| "io/ioutil" |
| "os" |
| "path" |
| "path/filepath" |
| "strings" |
| |
| "golang.org/x/mobile/bind" |
| ) |
| |
| // ctx, pkg, tmpdir in build.go |
| |
| var cmdBind = &command{ |
| run: runBind, |
| Name: "bind", |
| Usage: "[-target android|ios] [-o output] [build flags] [package]", |
| Short: "build a library for Android and iOS", |
| Long: ` |
| Bind generates language bindings for the package named by the import |
| path, and compiles a library for the named target system. |
| |
| The -target flag takes a target system name, either android (the |
| default) or ios. |
| |
| For -target android, the bind command produces an AAR (Android ARchive) |
| file that archives the precompiled Java API stub classes, the compiled |
| shared libraries, and all asset files in the /assets subdirectory under |
| the package directory. The output is named '<package_name>.aar' by |
| default. This AAR file is commonly used for binary distribution of an |
| Android library project and most Android IDEs support AAR import. For |
| example, in Android Studio (1.2+), an AAR file can be imported using |
| the module import wizard (File > New > New Module > Import .JAR or |
| .AAR package), and setting it as a new dependency |
| (File > Project Structure > Dependencies). This requires 'javac' |
| (version 1.7+) and Android SDK (API level 9 or newer) to build the |
| library for Android. The environment variable ANDROID_HOME must be set |
| to the path to Android SDK. The generated Java class is in the java |
| package 'go.<package_name>' unless -javapkg flag is specified. |
| |
| For -target ios, gomobile must be run on an OS X machine with Xcode |
| installed. Support is not complete. The generated Objective-C types |
| are prefixed with 'Go' unless the -prefix flag is provided. |
| |
| The -v flag provides verbose output, including the list of packages built. |
| |
| The build flags -a, -n, -x, -gcflags, -ldflags, -tags, and -work |
| are shared with the build command. For documentation, see 'go help build'. |
| `, |
| } |
| |
| func runBind(cmd *command) error { |
| cleanup, err := buildEnvInit() |
| if err != nil { |
| return err |
| } |
| defer cleanup() |
| |
| args := cmd.flag.Args() |
| |
| targetOS, targetArchs, err := parseBuildTarget(buildTarget) |
| if err != nil { |
| return fmt.Errorf(`invalid -target=%q: %v`, buildTarget, err) |
| } |
| |
| ctx.GOARCH = "arm" |
| ctx.GOOS = targetOS |
| |
| if bindJavaPkg != "" && ctx.GOOS != "android" { |
| return fmt.Errorf("-javapkg is supported only for android target") |
| } |
| if bindPrefix != "" && ctx.GOOS != "darwin" { |
| return fmt.Errorf("-prefix is supported only for ios target") |
| } |
| |
| var pkgs []*build.Package |
| switch len(args) { |
| case 0: |
| pkgs = make([]*build.Package, 1) |
| pkgs[0], err = ctx.ImportDir(cwd, build.ImportComment) |
| default: |
| pkgs, err = importPackages(args) |
| } |
| if err != nil { |
| return err |
| } |
| |
| switch targetOS { |
| case "android": |
| return goAndroidBind(pkgs, targetArchs) |
| case "darwin": |
| // TODO: use targetArchs? |
| return goIOSBind(pkgs) |
| default: |
| return fmt.Errorf(`invalid -target=%q`, buildTarget) |
| } |
| } |
| |
| func importPackages(args []string) ([]*build.Package, error) { |
| pkgs := make([]*build.Package, len(args)) |
| for i, path := range args { |
| var err error |
| if pkgs[i], err = ctx.Import(path, cwd, build.ImportComment); err != nil { |
| return nil, fmt.Errorf("package %q: %v", path, err) |
| } |
| } |
| return pkgs, nil |
| } |
| |
| var ( |
| bindPrefix string // -prefix |
| bindJavaPkg string // -javapkg |
| ) |
| |
| func init() { |
| // bind command specific commands. |
| cmdBind.flag.StringVar(&bindJavaPkg, "javapkg", "", |
| "specifies custom Java package path used instead of the default 'go.<go package name>'. Valid only with -target=android.") |
| cmdBind.flag.StringVar(&bindPrefix, "prefix", "", |
| "custom Objective-C name prefix used instead of the default 'Go'. Valid only with -lang=ios.") |
| } |
| |
| type binder struct { |
| files []*ast.File |
| fset *token.FileSet |
| pkgs []*types.Package |
| } |
| |
| func (b *binder) GenObjc(pkg *types.Package, outdir string) (string, error) { |
| const bindPrefixDefault = "Go" |
| if bindPrefix == "" { |
| bindPrefix = bindPrefixDefault |
| } |
| name := strings.Title(pkg.Name()) |
| bindOption := "-lang=objc" |
| if bindPrefix != bindPrefixDefault { |
| bindOption += " -prefix=" + bindPrefix |
| } |
| |
| fileBase := bindPrefix + name |
| mfile := filepath.Join(outdir, fileBase+".m") |
| hfile := filepath.Join(outdir, fileBase+".h") |
| |
| generate := func(w io.Writer) error { |
| if buildX { |
| printcmd("gobind %s -outdir=%s %s", bindOption, outdir, pkg.Path()) |
| } |
| if buildN { |
| return nil |
| } |
| return bind.GenObjc(w, b.fset, pkg, bindPrefix, false) |
| } |
| if err := writeFile(mfile, generate); err != nil { |
| return "", err |
| } |
| generate = func(w io.Writer) error { |
| if buildN { |
| return nil |
| } |
| return bind.GenObjc(w, b.fset, pkg, bindPrefix, true) |
| } |
| if err := writeFile(hfile, generate); err != nil { |
| return "", err |
| } |
| |
| objcPkg, err := ctx.Import("golang.org/x/mobile/bind/objc", "", build.FindOnly) |
| if err != nil { |
| return "", err |
| } |
| if err := copyFile(filepath.Join(outdir, "seq.h"), filepath.Join(objcPkg.Dir, "seq.h")); err != nil { |
| return "", err |
| } |
| return fileBase, nil |
| } |
| |
| func (b *binder) GenJava(pkg *types.Package, outdir string) error { |
| className := strings.Title(pkg.Name()) |
| javaFile := filepath.Join(outdir, className+".java") |
| bindOption := "-lang=java" |
| if bindJavaPkg != "" { |
| bindOption += " -javapkg=" + bindJavaPkg |
| } |
| |
| generate := func(w io.Writer) error { |
| if buildX { |
| printcmd("gobind %s -outdir=%s %s", bindOption, outdir, pkg.Path()) |
| } |
| if buildN { |
| return nil |
| } |
| return bind.GenJava(w, b.fset, pkg, bindJavaPkg) |
| } |
| if err := writeFile(javaFile, generate); err != nil { |
| return err |
| } |
| return nil |
| } |
| |
| func (b *binder) GenGo(pkg *types.Package, outdir string) error { |
| pkgName := "go_" + pkg.Name() |
| outdir = filepath.Join(outdir, pkgName) |
| goFile := filepath.Join(outdir, pkgName+"main.go") |
| |
| generate := func(w io.Writer) error { |
| if buildX { |
| printcmd("gobind -lang=go -outdir=%s %s", outdir, pkg.Path()) |
| } |
| if buildN { |
| return nil |
| } |
| return bind.GenGo(w, b.fset, pkg) |
| } |
| if err := writeFile(goFile, generate); err != nil { |
| return err |
| } |
| return nil |
| } |
| |
| func copyFile(dst, src string) error { |
| if buildX { |
| printcmd("cp %s %s", src, dst) |
| } |
| return writeFile(dst, func(w io.Writer) error { |
| if buildN { |
| return nil |
| } |
| f, err := os.Open(src) |
| if err != nil { |
| return err |
| } |
| defer f.Close() |
| |
| if _, err := io.Copy(w, f); err != nil { |
| return fmt.Errorf("cp %s %s failed: %v", src, dst, err) |
| } |
| return nil |
| }) |
| } |
| |
| func writeFile(filename string, generate func(io.Writer) error) error { |
| if buildV { |
| fmt.Fprintf(os.Stderr, "write %s\n", filename) |
| } |
| |
| err := mkdir(filepath.Dir(filename)) |
| if err != nil { |
| return err |
| } |
| |
| if buildN { |
| return generate(ioutil.Discard) |
| } |
| |
| f, err := os.Create(filename) |
| if err != nil { |
| return err |
| } |
| defer func() { |
| if cerr := f.Close(); err == nil { |
| err = cerr |
| } |
| }() |
| |
| return generate(f) |
| } |
| |
| func loadExportData(pkgs []*build.Package, env []string, args ...string) ([]*types.Package, error) { |
| // Compile the package. This will produce good errors if the package |
| // doesn't typecheck for some reason, and is a necessary step to |
| // building the final output anyway. |
| paths := make([]string, len(pkgs)) |
| for i, p := range pkgs { |
| paths[i] = p.ImportPath |
| } |
| if err := goInstall(paths, env, args...); err != nil { |
| return nil, err |
| } |
| |
| goos, goarch := getenv(env, "GOOS"), getenv(env, "GOARCH") |
| |
| // Assemble a fake GOPATH and trick go/importer into using it. |
| // Ideally the importer package would let us provide this to |
| // it somehow, but this works with what's in Go 1.5 today and |
| // gives us access to the gcimporter package without us having |
| // to make a copy of it. |
| fakegopath := filepath.Join(tmpdir, "fakegopath") |
| if err := removeAll(fakegopath); err != nil { |
| return nil, err |
| } |
| if err := mkdir(filepath.Join(fakegopath, "pkg")); err != nil { |
| return nil, err |
| } |
| typePkgs := make([]*types.Package, len(pkgs)) |
| for i, p := range pkgs { |
| importPath := p.ImportPath |
| src := filepath.Join(pkgdir(env), importPath+".a") |
| dst := filepath.Join(fakegopath, "pkg/"+goos+"_"+goarch+"/"+importPath+".a") |
| if err := copyFile(dst, src); err != nil { |
| return nil, err |
| } |
| if buildN { |
| typePkgs[i] = types.NewPackage(importPath, path.Base(importPath)) |
| continue |
| } |
| oldDefault := build.Default |
| build.Default = ctx // copy |
| build.Default.GOARCH = goarch |
| build.Default.GOPATH = fakegopath |
| p, err := importer.Default().Import(importPath) |
| build.Default = oldDefault |
| if err != nil { |
| return nil, err |
| } |
| typePkgs[i] = p |
| } |
| return typePkgs, nil |
| } |
| |
| func newBinder(pkgs []*types.Package) (*binder, error) { |
| for _, pkg := range pkgs { |
| if pkg.Name() == "main" { |
| return nil, fmt.Errorf("package %q (%q): can only bind a library package", pkg.Name(), pkg.Path()) |
| } |
| } |
| b := &binder{ |
| fset: token.NewFileSet(), |
| pkgs: pkgs, |
| } |
| return b, nil |
| } |