File size: 3,056 Bytes
61bba11 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 | // 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"
"cmd/internal/telemetry/counter"
)
func main() {
log.SetFlags(0)
log.SetPrefix("asm: ")
counter.Open()
buildcfg.Check()
GOARCH := buildcfg.GOARCH
flags.Parse()
counter.Inc("asm/invocations")
counter.CountFlags("asm/flag:", *flag.CommandLine)
architecture := arch.Set(GOARCH, *flags.Shared || *flags.Dynlink)
if architecture == nil {
log.Fatalf("unrecognized architecture %s", GOARCH)
}
ctxt := obj.Linknew(architecture.LinkArch)
ctxt.CompressInstructions = flags.DebugFlags.CompressInstructions != 0
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
ctxt.DwTextCount = objabi.DummyDwarfFunctionCountForAssembler()
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=-spectre=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")
}
// Set macros for GOEXPERIMENTs so we can easily switch
// runtime assembly code based on them.
if objabi.LookupPkgSpecial(ctxt.Pkgpath).AllowAsmABI {
for _, exp := range buildcfg.Experiment.Enabled() {
flags.D = append(flags.D, "GOEXPERIMENT_"+exp)
}
}
var ok, diag bool
var failedFile string
for _, f := range flag.Args() {
lexer := lex.NewLexer(f)
parser := asm.NewParser(ctxt, architecture, lexer)
ctxt.DiagFunc = func(format string, args ...any) {
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)
}
}
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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