mirror of https://github.com/golang/go.git
81 lines
2.2 KiB
Go
81 lines
2.2 KiB
Go
// Copyright 2015 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Package flags implements top-level flags and the usage message for the assembler.
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package flags
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import (
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"cmd/internal/objabi"
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"flag"
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"fmt"
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"os"
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"path/filepath"
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"strings"
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)
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var (
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Debug = flag.Bool("debug", false, "dump instructions as they are parsed")
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OutputFile = flag.String("o", "", "output file; default foo.o for /a/b/c/foo.s as first argument")
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PrintOut = flag.Bool("S", false, "print assembly and machine code")
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TrimPath = flag.String("trimpath", "", "remove prefix from recorded source file paths")
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Shared = flag.Bool("shared", false, "generate code that can be linked into a shared library")
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Dynlink = flag.Bool("dynlink", false, "support references to Go symbols defined in other shared libraries")
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AllErrors = flag.Bool("e", false, "no limit on number of errors reported")
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SymABIs = flag.Bool("gensymabis", false, "write symbol ABI information to output file, don't assemble")
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Newobj = flag.Bool("newobj", true, "use new object file format")
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)
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var (
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D MultiFlag
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I MultiFlag
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)
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func init() {
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flag.Var(&D, "D", "predefined symbol with optional simple value -D=identifier=value; can be set multiple times")
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flag.Var(&I, "I", "include directory; can be set multiple times")
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objabi.AddVersionFlag() // -V
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}
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// MultiFlag allows setting a value multiple times to collect a list, as in -I=dir1 -I=dir2.
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type MultiFlag []string
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func (m *MultiFlag) String() string {
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if len(*m) == 0 {
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return ""
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}
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return fmt.Sprint(*m)
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}
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func (m *MultiFlag) Set(val string) error {
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(*m) = append(*m, val)
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return nil
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}
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func Usage() {
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fmt.Fprintf(os.Stderr, "usage: asm [options] file.s ...\n")
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fmt.Fprintf(os.Stderr, "Flags:\n")
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flag.PrintDefaults()
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os.Exit(2)
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}
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func Parse() {
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flag.Usage = Usage
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flag.Parse()
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if flag.NArg() == 0 {
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flag.Usage()
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}
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// Flag refinement.
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if *OutputFile == "" {
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if flag.NArg() != 1 {
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flag.Usage()
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}
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input := filepath.Base(flag.Arg(0))
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if strings.HasSuffix(input, ".s") {
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input = input[:len(input)-2]
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}
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*OutputFile = fmt.Sprintf("%s.o", input)
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}
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}
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