go main 源码
golang main 代码
文件路径：/src/cmd/asm/main.go
// Copyright 2014 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 (
"bufio"
"flag"
"fmt"
"internal/buildcfg"
"log"
"os"
"cmd/asm/internal/arch"
"cmd/asm/internal/asm"
"cmd/asm/internal/flags"
"cmd/asm/internal/lex"
"cmd/internal/bio"
"cmd/internal/obj"
"cmd/internal/objabi"
)
func main() {
log.SetFlags(0)
log.SetPrefix("asm: ")
buildcfg.Check()
GOARCH := buildcfg.GOARCH
flags.Parse()
architecture := arch.Set(GOARCH, *flags.Shared || *flags.Dynlink)
if architecture == nil {
log.Fatalf("unrecognized architecture %s", GOARCH)
}
ctxt := obj.Linknew(architecture.LinkArch)
ctxt.Debugasm = flags.PrintOut
ctxt.Debugvlog = flags.DebugV
ctxt.Flag_dynlink = *flags.Dynlink
ctxt.Flag_linkshared = *flags.Linkshared
ctxt.Flag_shared = *flags.Shared || *flags.Dynlink
ctxt.Flag_maymorestack = flags.DebugFlags.MayMoreStack
ctxt.Debugpcln = flags.DebugFlags.PCTab
ctxt.IsAsm = true
ctxt.Pkgpath = *flags.Importpath
switch *flags.Spectre {
default:
log.Printf("unknown setting -spectre=%s", *flags.Spectre)
os.Exit(2)
case "":
// nothing
case "index":
// known to compiler; ignore here so people can use
// the same list with -gcflags=-spectre=LIST and -asmflags=-spectrre=LIST
case "all", "ret":
ctxt.Retpoline = true
}
ctxt.Bso = bufio.NewWriter(os.Stdout)
defer ctxt.Bso.Flush()
architecture.Init(ctxt)
// Create object file, write header.
buf, err := bio.Create(*flags.OutputFile)
if err != nil {
log.Fatal(err)
}
defer buf.Close()
if !*flags.SymABIs {
buf.WriteString(objabi.HeaderString())
fmt.Fprintf(buf, "!\n")
}
var ok, diag bool
var failedFile string
for _, f := range flag.Args() {
lexer := lex.NewLexer(f)
parser := asm.NewParser(ctxt, architecture, lexer,
*flags.CompilingRuntime)
ctxt.DiagFunc = func(format string, args ...interface{}) {
diag = true
log.Printf(format, args...)
}
if *flags.SymABIs {
ok = parser.ParseSymABIs(buf)
} else {
pList := new(obj.Plist)
pList.Firstpc, ok = parser.Parse()
// reports errors to parser.Errorf
if ok {
obj.Flushplist(ctxt, pList, nil, *flags.Importpath)
}
}
if !ok {
failedFile = f
break
}
}
if ok && !*flags.SymABIs {
ctxt.NumberSyms()
obj.WriteObjFile(ctxt, buf)
}
if !ok || diag {
if failedFile != "" {
log.Printf("assembly of %s failed", failedFile)
} else {
log.Print("assembly failed")
}
buf.Close()
os.Remove(*flags.OutputFile)
os.Exit(1)
}
}
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