| // Copyright 2011 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 run implements the ``go run'' command. |
| package run |
| |
| import ( |
| "fmt" |
| "os" |
| "strings" |
| |
| "cmd/go/internal/base" |
| "cmd/go/internal/cfg" |
| "cmd/go/internal/load" |
| "cmd/go/internal/str" |
| "cmd/go/internal/work" |
| ) |
| |
| var CmdRun = &base.Command{ |
| UsageLine: "go run [build flags] [-exec xprog] package [arguments...]", |
| Short: "compile and run Go program", |
| Long: ` |
| Run compiles and runs the named main Go package. |
| Typically the package is specified as a list of .go source files, |
| but it may also be an import path, file system path, or pattern |
| matching a single known package, as in 'go run .' or 'go run my/cmd'. |
| |
| By default, 'go run' runs the compiled binary directly: 'a.out arguments...'. |
| If the -exec flag is given, 'go run' invokes the binary using xprog: |
| 'xprog a.out arguments...'. |
| If the -exec flag is not given, GOOS or GOARCH is different from the system |
| default, and a program named go_$GOOS_$GOARCH_exec can be found |
| on the current search path, 'go run' invokes the binary using that program, |
| for example 'go_nacl_386_exec a.out arguments...'. This allows execution of |
| cross-compiled programs when a simulator or other execution method is |
| available. |
| |
| The exit status of Run is not the exit status of the compiled binary. |
| |
| For more about build flags, see 'go help build'. |
| For more about specifying packages, see 'go help packages'. |
| |
| See also: go build. |
| `, |
| } |
| |
| func init() { |
| CmdRun.Run = runRun // break init loop |
| |
| work.AddBuildFlags(CmdRun) |
| CmdRun.Flag.Var((*base.StringsFlag)(&work.ExecCmd), "exec", "") |
| } |
| |
| func printStderr(args ...interface{}) (int, error) { |
| return fmt.Fprint(os.Stderr, args...) |
| } |
| |
| func runRun(cmd *base.Command, args []string) { |
| work.BuildInit() |
| var b work.Builder |
| b.Init() |
| b.Print = printStderr |
| i := 0 |
| for i < len(args) && strings.HasSuffix(args[i], ".go") { |
| i++ |
| } |
| var p *load.Package |
| if i > 0 { |
| files := args[:i] |
| for _, file := range files { |
| if strings.HasSuffix(file, "_test.go") { |
| // GoFilesPackage is going to assign this to TestGoFiles. |
| // Reject since it won't be part of the build. |
| base.Fatalf("go run: cannot run *_test.go files (%s)", file) |
| } |
| } |
| p = load.GoFilesPackage(files) |
| } else if len(args) > 0 && !strings.HasPrefix(args[0], "-") { |
| pkgs := load.PackagesAndErrors(args[:1]) |
| if len(pkgs) == 0 { |
| base.Fatalf("go run: no packages loaded from %s", args[0]) |
| } |
| if len(pkgs) > 1 { |
| var names []string |
| for _, p := range pkgs { |
| names = append(names, p.ImportPath) |
| } |
| base.Fatalf("go run: pattern %s matches multiple packages:\n\t%s", args[0], strings.Join(names, "\n\t")) |
| } |
| p = pkgs[0] |
| i++ |
| } else { |
| base.Fatalf("go run: no go files listed") |
| } |
| cmdArgs := args[i:] |
| |
| if p.Error != nil { |
| base.Fatalf("%s", p.Error) |
| } |
| p.Internal.OmitDebug = true |
| if len(p.DepsErrors) > 0 { |
| // Since these are errors in dependencies, |
| // the same error might show up multiple times, |
| // once in each package that depends on it. |
| // Only print each once. |
| printed := map[*load.PackageError]bool{} |
| for _, err := range p.DepsErrors { |
| if !printed[err] { |
| printed[err] = true |
| base.Errorf("%s", err) |
| } |
| } |
| } |
| base.ExitIfErrors() |
| if p.Name != "main" { |
| base.Fatalf("go run: cannot run non-main package") |
| } |
| p.Target = "" // must build - not up to date |
| var src string |
| if len(p.GoFiles) > 0 { |
| src = p.GoFiles[0] |
| } else if len(p.CgoFiles) > 0 { |
| src = p.CgoFiles[0] |
| } else { |
| // this case could only happen if the provided source uses cgo |
| // while cgo is disabled. |
| hint := "" |
| if !cfg.BuildContext.CgoEnabled { |
| hint = " (cgo is disabled)" |
| } |
| base.Fatalf("go run: no suitable source files%s", hint) |
| } |
| p.Internal.ExeName = src[:len(src)-len(".go")] // name temporary executable for first go file |
| a1 := b.LinkAction(work.ModeBuild, work.ModeBuild, p) |
| a := &work.Action{Mode: "go run", Func: buildRunProgram, Args: cmdArgs, Deps: []*work.Action{a1}} |
| b.Do(a) |
| } |
| |
| // buildRunProgram is the action for running a binary that has already |
| // been compiled. We ignore exit status. |
| func buildRunProgram(b *work.Builder, a *work.Action) error { |
| cmdline := str.StringList(work.FindExecCmd(), a.Deps[0].Target, a.Args) |
| if cfg.BuildN || cfg.BuildX { |
| b.Showcmd("", "%s", strings.Join(cmdline, " ")) |
| if cfg.BuildN { |
| return nil |
| } |
| } |
| |
| base.RunStdin(cmdline) |
| return nil |
| } |