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