github.com/rakyll/go@v0.0.0-20170216000551-64c02460d703/src/cmd/asm/main.go (about)

     1  // Copyright 2014 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package main
     6  
     7  import (
     8  	"bufio"
     9  	"flag"
    10  	"fmt"
    11  	"log"
    12  	"os"
    13  
    14  	"cmd/asm/internal/arch"
    15  	"cmd/asm/internal/asm"
    16  	"cmd/asm/internal/flags"
    17  	"cmd/asm/internal/lex"
    18  
    19  	"cmd/internal/bio"
    20  	"cmd/internal/obj"
    21  )
    22  
    23  func main() {
    24  	log.SetFlags(0)
    25  	log.SetPrefix("asm: ")
    26  
    27  	GOARCH := obj.GOARCH
    28  
    29  	architecture := arch.Set(GOARCH)
    30  	if architecture == nil {
    31  		log.Fatalf("unrecognized architecture %s", GOARCH)
    32  	}
    33  
    34  	flags.Parse()
    35  
    36  	ctxt := obj.Linknew(architecture.LinkArch)
    37  	if *flags.PrintOut {
    38  		ctxt.Debugasm = 1
    39  	}
    40  	ctxt.Flag_dynlink = *flags.Dynlink
    41  	ctxt.Flag_shared = *flags.Shared || *flags.Dynlink
    42  	ctxt.Bso = bufio.NewWriter(os.Stdout)
    43  	defer ctxt.Bso.Flush()
    44  
    45  	// Create object file, write header.
    46  	out, err := os.Create(*flags.OutputFile)
    47  	if err != nil {
    48  		log.Fatal(err)
    49  	}
    50  	defer bio.MustClose(out)
    51  	buf := bufio.NewWriter(bio.MustWriter(out))
    52  
    53  	fmt.Fprintf(buf, "go object %s %s %s\n", obj.GOOS, obj.GOARCH, obj.Version)
    54  	fmt.Fprintf(buf, "!\n")
    55  
    56  	var ok, diag bool
    57  	var failedFile string
    58  	for _, f := range flag.Args() {
    59  		lexer := lex.NewLexer(f)
    60  		parser := asm.NewParser(ctxt, architecture, lexer)
    61  		ctxt.DiagFunc = func(format string, args ...interface{}) {
    62  			diag = true
    63  			log.Printf(format, args...)
    64  		}
    65  		pList := obj.Linknewplist(ctxt)
    66  		pList.Firstpc, ok = parser.Parse()
    67  		if !ok {
    68  			failedFile = f
    69  			break
    70  		}
    71  	}
    72  	if ok {
    73  		// reports errors to parser.Errorf
    74  		obj.Writeobjdirect(ctxt, buf)
    75  	}
    76  	if !ok || diag {
    77  		if failedFile != "" {
    78  			log.Printf("assembly of %s failed", failedFile)
    79  		} else {
    80  			log.Print("assembly failed")
    81  		}
    82  		out.Close()
    83  		os.Remove(*flags.OutputFile)
    84  		os.Exit(1)
    85  	}
    86  	buf.Flush()
    87  }