tools/llvm-go/llvm-go.go

   1 //===-- llvm-go.go - go tool wrapper for LLVM -----------------------------===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9 //
  10 // This tool lets us build LLVM components within the tree by setting up a
  11 // $GOPATH that resembles a tree fetched in the normal way with "go get".
  12 //
  13 //===----------------------------------------------------------------------===//
  14
  15 package main
  16
  17 import (
  18         "fmt"
  19         "io/ioutil"
  20         "os"
  21         "os/exec"
  22         "path/filepath"
  23         "runtime"
  24         "strings"
  25 )
  26
  27 const (
  28         linkmodeComponentLibs = "component-libs"
  29         linkmodeDylib         = "dylib"
  30 )
  31
  32 type pkg struct {
  33         llvmpath, pkgpath string
  34 }
  35
  36 var packages = []pkg{
  37         {"bindings/go/llvm", "llvm.org/llvm/bindings/go/llvm"},
  38         {"tools/llgo", "llvm.org/llgo"},
  39 }
  40
  41 type compilerFlags struct {
  42         cpp, cxx, ld string
  43 }
  44
  45 var components = []string{
  46         "all-targets",
  47         "analysis",
  48         "asmparser",
  49         "asmprinter",
  50         "bitreader",
  51         "bitwriter",
  52         "codegen",
  53         "core",
  54         "debuginfodwarf",
  55         "executionengine",
  56         "instrumentation",
  57         "interpreter",
  58         "ipo",
  59         "irreader",
  60         "linker",
  61         "mc",
  62         "mcjit",
  63         "objcarcopts",
  64         "option",
  65         "profiledata",
  66         "scalaropts",
  67         "support",
  68         "target",
  69 }
  70
  71 func llvmConfig(args ...string) string {
  72         configpath := os.Getenv("LLVM_CONFIG")
  73         if configpath == "" {
  74                 bin, _ := filepath.Split(os.Args[0])
  75                 configpath = filepath.Join(bin, "llvm-config")
  76         }
  77
  78         cmd := exec.Command(configpath, args...)
  79         cmd.Stderr = os.Stderr
  80         out, err := cmd.Output()
  81         if err != nil {
  82                 panic(err.Error())
  83         }
  84
  85         outstr := string(out)
  86         outstr = strings.TrimSuffix(outstr, "\n")
  87         outstr = strings.Replace(outstr, "\n", " ", -1)
  88         return outstr
  89 }
  90
  91 func llvmFlags() compilerFlags {
  92         ldflags := llvmConfig("--ldflags", "--libs", "--system-libs")
  93         if runtime.GOOS != "darwin" {
  94                 // OS X doesn't like -rpath with cgo. See:
  95                 // https://code.google.com/p/go/issues/detail?id=7293
  96                 ldflags = "-Wl,-rpath," + llvmConfig("--libdir") + " " + ldflags
  97         }
  98         return compilerFlags{
  99                 cpp: llvmConfig("--cppflags"),
 100                 cxx: "-std=c++11",
 101                 ld:  ldflags,
 102         }
 103 }
 104
 105 func addTag(args []string, tag string) []string {
 106         args = append([]string{}, args...)
 107         addedTag := false
 108         for i, a := range args {
 109                 if strings.HasPrefix(a, "-tags=") {
 110                         args[i] = a + " " + tag
 111                         addedTag = true
 112                 } else if a == "-tags" && i+1 < len(args) {
 113                         args[i+1] = args[i+1] + " " + tag
 114                         addedTag = true
 115                 }
 116         }
 117         if !addedTag {
 118                 args = append([]string{args[0], "-tags", tag}, args[1:]...)
 119         }
 120         return args
 121 }
 122
 123 func printComponents() {
 124         fmt.Println(strings.Join(components, " "))
 125 }
 126
 127 func printConfig() {
 128         flags := llvmFlags()
 129
 130         fmt.Printf(`// +build !byollvm
 131
 132 // This file is generated by llvm-go, do not edit.
 133
 134 package llvm
 135
 136 /*
 137 #cgo CPPFLAGS: %s
 138 #cgo CXXFLAGS: %s
 139 #cgo LDFLAGS: %s
 140 */
 141 import "C"
 142
 143 type (run_build_sh int)
 144 `, flags.cpp, flags.cxx, flags.ld)
 145 }
 146
 147 func runGoWithLLVMEnv(args []string, cc, cxx, gocmd, llgo, cppflags, cxxflags, ldflags string) {
 148         args = addTag(args, "byollvm")
 149
 150         srcdir := llvmConfig("--src-root")
 151
 152         tmpgopath, err := ioutil.TempDir("", "gopath")
 153         if err != nil {
 154                 panic(err.Error())
 155         }
 156
 157         for _, p := range packages {
 158                 path := filepath.Join(tmpgopath, "src", p.pkgpath)
 159                 err := os.MkdirAll(filepath.Dir(path), os.ModePerm)
 160                 if err != nil {
 161                         panic(err.Error())
 162                 }
 163
 164                 err = os.Symlink(filepath.Join(srcdir, p.llvmpath), path)
 165                 if err != nil {
 166                         panic(err.Error())
 167                 }
 168         }
 169
 170         newpath := os.Getenv("PATH")
 171
 172         newgopathlist := []string{tmpgopath}
 173         newgopathlist = append(newgopathlist, filepath.SplitList(os.Getenv("GOPATH"))...)
 174         newgopath := strings.Join(newgopathlist, string(filepath.ListSeparator))
 175
 176         flags := llvmFlags()
 177
 178         newenv := []string{
 179                 "CC=" + cc,
 180                 "CXX=" + cxx,
 181                 "CGO_CPPFLAGS=" + flags.cpp + " " + cppflags,
 182                 "CGO_CXXFLAGS=" + flags.cxx + " " + cxxflags,
 183                 "CGO_LDFLAGS=" + flags.ld + " " + ldflags,
 184                 "GOPATH=" + newgopath,
 185                 "PATH=" + newpath,
 186         }
 187         if llgo != "" {
 188                 newenv = append(newenv, "GCCGO="+llgo)
 189         }
 190
 191         for _, v := range os.Environ() {
 192                 if !strings.HasPrefix(v, "CC=") &&
 193                         !strings.HasPrefix(v, "CXX=") &&
 194                         !strings.HasPrefix(v, "CGO_CPPFLAGS=") &&
 195                         !strings.HasPrefix(v, "CGO_CXXFLAGS=") &&
 196                         !strings.HasPrefix(v, "CGO_LDFLAGS=") &&
 197                         !strings.HasPrefix(v, "GCCGO=") &&
 198                         !strings.HasPrefix(v, "GOPATH=") &&
 199                         !strings.HasPrefix(v, "PATH=") {
 200                         newenv = append(newenv, v)
 201                 }
 202         }
 203
 204         gocmdpath, err := exec.LookPath(gocmd)
 205         if err != nil {
 206                 panic(err.Error())
 207         }
 208
 209         proc, err := os.StartProcess(gocmdpath, append([]string{gocmd}, args...),
 210                 &os.ProcAttr{
 211                         Env:   newenv,
 212                         Files: []*os.File{os.Stdin, os.Stdout, os.Stderr},
 213                 })
 214         if err != nil {
 215                 panic(err.Error())
 216         }
 217         ps, err := proc.Wait()
 218         if err != nil {
 219                 panic(err.Error())
 220         }
 221
 222         os.RemoveAll(tmpgopath)
 223
 224         if !ps.Success() {
 225                 os.Exit(1)
 226         }
 227 }
 228
 229 func usage() {
 230         fmt.Println(`Usage: llvm-go subcommand [flags]
 231
 232 Available subcommands: build get install run test print-components print-config`)
 233         os.Exit(0)
 234 }
 235
 236 func main() {
 237         cc := os.Getenv("CC")
 238         cxx := os.Getenv("CXX")
 239         cppflags := os.Getenv("CGO_CPPFLAGS")
 240         cxxflags := os.Getenv("CGO_CXXFLAGS")
 241         ldflags := os.Getenv("CGO_LDFLAGS")
 242         gocmd := "go"
 243         llgo := ""
 244
 245         flags := []struct {
 246                 name string
 247                 dest *string
 248         }{
 249                 {"cc", &cc},
 250                 {"cxx", &cxx},
 251                 {"go", &gocmd},
 252                 {"llgo", &llgo},
 253                 {"cppflags", &cppflags},
 254                 {"ldflags", &ldflags},
 255         }
 256
 257         args := os.Args[1:]
 258 LOOP:
 259         for {
 260                 if len(args) == 0 {
 261                         usage()
 262                 }
 263                 for _, flag := range flags {
 264                         if strings.HasPrefix(args[0], flag.name+"=") {
 265                                 *flag.dest = args[0][len(flag.name)+1:]
 266                                 args = args[1:]
 267                                 continue LOOP
 268                         }
 269                 }
 270                 break
 271         }
 272
 273         switch args[0] {
 274         case "build", "get", "install", "run", "test":
 275                 runGoWithLLVMEnv(args, cc, cxx, gocmd, llgo, cppflags, cxxflags, ldflags)
 276         case "print-components":
 277                 printComponents()
 278         case "print-config":
 279                 printConfig()
 280         default:
 281                 usage()
 282         }
 283 }