Adding upstream version 1.16.10.upstream/1.16.10upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 84 insertions, 0 deletions

diff --git a/src/cmd/asm/internal/flags/flags.go b/src/cmd/asm/internal/flags/flags.go
new file mode 100644
index 0000000..1335860
--- /dev/null
+++ b/src/cmd/asm/internal/flags/flags.go
@@ -0,0 +1,84 @@
+// 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 flags implements top-level flags and the usage message for the assembler.
+package flags
+
+import (
+	"cmd/internal/objabi"
+	"flag"
+	"fmt"
+	"os"
+	"path/filepath"
+	"strings"
+)
+
+var (
+	Debug            = flag.Bool("debug", false, "dump instructions as they are parsed")
+	OutputFile       = flag.String("o", "", "output file; default foo.o for /a/b/c/foo.s as first argument")
+	TrimPath         = flag.String("trimpath", "", "remove prefix from recorded source file paths")
+	Shared           = flag.Bool("shared", false, "generate code that can be linked into a shared library")
+	Dynlink          = flag.Bool("dynlink", false, "support references to Go symbols defined in other shared libraries")
+	Linkshared       = flag.Bool("linkshared", false, "generate code that will be linked against Go shared libraries")
+	AllErrors        = flag.Bool("e", false, "no limit on number of errors reported")
+	SymABIs          = flag.Bool("gensymabis", false, "write symbol ABI information to output file, don't assemble")
+	Importpath       = flag.String("p", "", "set expected package import to path")
+	Spectre          = flag.String("spectre", "", "enable spectre mitigations in `list` (all, ret)")
+	CompilingRuntime = flag.Bool("compiling-runtime", false, "source to be compiled is part of the Go runtime")
+)
+
+var (
+	D        MultiFlag
+	I        MultiFlag
+	PrintOut int
+)
+
+func init() {
+	flag.Var(&D, "D", "predefined symbol with optional simple value -D=identifier=value; can be set multiple times")
+	flag.Var(&I, "I", "include directory; can be set multiple times")
+	objabi.AddVersionFlag() // -V
+	objabi.Flagcount("S", "print assembly and machine code", &PrintOut)
+}
+
+// MultiFlag allows setting a value multiple times to collect a list, as in -I=dir1 -I=dir2.
+type MultiFlag []string
+
+func (m *MultiFlag) String() string {
+	if len(*m) == 0 {
+		return ""
+	}
+	return fmt.Sprint(*m)
+}
+
+func (m *MultiFlag) Set(val string) error {
+	(*m) = append(*m, val)
+	return nil
+}
+
+func Usage() {
+	fmt.Fprintf(os.Stderr, "usage: asm [options] file.s ...\n")
+	fmt.Fprintf(os.Stderr, "Flags:\n")
+	flag.PrintDefaults()
+	os.Exit(2)
+}
+
+func Parse() {
+	flag.Usage = Usage
+	flag.Parse()
+	if flag.NArg() == 0 {
+		flag.Usage()
+	}
+
+	// Flag refinement.
+	if *OutputFile == "" {
+		if flag.NArg() != 1 {
+			flag.Usage()
+		}
+		input := filepath.Base(flag.Arg(0))
+		if strings.HasSuffix(input, ".s") {
+			input = input[:len(input)-2]
+		}
+		*OutputFile = fmt.Sprintf("%s.o", input)
+	}
+}