Delve Code Analysis Note (5)--debug command

This is a creation in Article, where the information may have evolved or changed.

dlv debugThe command compiles and debugs one package , with the following code:

func debugCmd(cmd *cobra.Command, args []string) {    status := func() int {        var pkg string        dlvArgs, targetArgs := splitArgs(cmd, args)        if len(dlvArgs) > 0 {            pkg = args[0]        }        err := gobuild(debugname, pkg)        if err != nil {            fmt.Fprintf(os.Stderr, "%v\n", err)            return 1        }        fp, err := filepath.Abs("./" + debugname)        if err != nil {            fmt.Fprintf(os.Stderr, "%v\n", err)            return 1        }        defer os.Remove(fp)        processArgs := append([]string{"./" + debugname}, targetArgs...)        return execute(0, processArgs, conf)    }()    os.Exit(status)}

Where the gobuild function is implemented as follows:

func gobuild(debugname, pkg string) error {    args := []string{"-gcflags", "-N -l", "-o", debugname}    if BuildFlags != "" {        args = append(args, BuildFlags)    }    args = append(args, pkg)    return gocommand("build", args...)}

dlv debugThe command is actually a temporary compilation in the current directory to generate an executable without code optimization, the file name is debug . The next step is execute to invoke the function to debug debug the file. dlvafter the program exits, the file is deleted: defer os.Remove(fp) .