src/cmd/link/main.go

   1 // Copyright 2015 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         "cmd/internal/sys"
   9         "cmd/link/internal/amd64"
  10         "cmd/link/internal/arm"
  11         "cmd/link/internal/arm64"
  12         "cmd/link/internal/ld"
  13         "cmd/link/internal/mips"
  14         "cmd/link/internal/mips64"
  15         "cmd/link/internal/ppc64"
  16         "cmd/link/internal/riscv64"
  17         "cmd/link/internal/s390x"
  18         "cmd/link/internal/wasm"
  19         "cmd/link/internal/x86"
  20         "fmt"
  21         "internal/buildcfg"
  22         "os"
  23 )
  24
  25 // The bulk of the linker implementation lives in cmd/link/internal/ld.
  26 // Architecture-specific code lives in cmd/link/internal/GOARCH.
  27 //
  28 // Program initialization:
  29 //
  30 // Before any argument parsing is done, the Init function of relevant
  31 // architecture package is called. The only job done in Init is
  32 // configuration of the architecture-specific variables.
  33 //
  34 // Then control flow passes to ld.Main, which parses flags, makes
  35 // some configuration decisions, and then gives the architecture
  36 // packages a second chance to modify the linker's configuration
  37 // via the ld.Arch.Archinit function.
  38
  39 func main() {
  40         var arch *sys.Arch
  41         var theArch ld.Arch
  42
  43         buildcfg.Check()
  44         switch buildcfg.GOARCH {
  45         default:
  46                 fmt.Fprintf(os.Stderr, "link: unknown architecture %q\n", buildcfg.GOARCH)
  47                 os.Exit(2)
  48         case "386":
  49                 arch, theArch = x86.Init()
  50         case "amd64":
  51                 arch, theArch = amd64.Init()
  52         case "arm":
  53                 arch, theArch = arm.Init()
  54         case "arm64":
  55                 arch, theArch = arm64.Init()
  56         case "mips", "mipsle":
  57                 arch, theArch = mips.Init()
  58         case "mips64", "mips64le":
  59                 arch, theArch = mips64.Init()
  60         case "ppc64", "ppc64le":
  61                 arch, theArch = ppc64.Init()
  62         case "riscv64":
  63                 arch, theArch = riscv64.Init()
  64         case "s390x":
  65                 arch, theArch = s390x.Init()
  66         case "wasm":
  67                 arch, theArch = wasm.Init()
  68         }
  69         ld.Main(arch, theArch)
  70 }