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// 24 may 2014
package main
import (
"fmt"
"os"
"strings"
"go/token"
"go/ast"
"go/parser"
"sort"
"io/ioutil"
"path/filepath"
"os/exec"
)
func getPackage(path string) (pkg *ast.Package) {
fileset := token.NewFileSet() // parser.ParseDir() actually writes to this; not sure why it doesn't return one instead
filter := func(i os.FileInfo) bool {
return strings.HasSuffix(i.Name(), "_windows.go")
}
pkgs, err := parser.ParseDir(fileset, path, filter, parser.AllErrors)
if err != nil {
panic(err)
}
if len(pkgs) != 1 {
panic("more than one package found")
}
for k, _ := range pkgs { // get the sole key
pkg = pkgs[k]
}
return pkg
}
type walker struct {
desired func(string) bool
}
var known = map[string]string{}
var unknown = map[string]struct{}{}
func (w *walker) Visit(node ast.Node) ast.Visitor {
if n, ok := node.(*ast.Ident); ok {
if w.desired(n.Name) {
if n.Obj != nil {
delete(unknown, n.Name)
kind := n.Obj.Kind.String()
if known[n.Name] != "" && known[n.Name] != kind {
panic(n.Name + "(" + kind + ") already known to be a " + known[n.Name])
}
known[n.Name] = kind
} else if _, ok := known[n.Name]; !ok { // only if not known
unknown[n.Name] = struct{}{}
}
}
}
return w
}
func gatherNames(pkg *ast.Package) {
desired := func(name string) bool {
if strings.HasPrefix(name, "_") && len(name) > 1 {
return !strings.ContainsAny(name,
"abcdefghijklmnopqrstuvwxyz")
}
return false
}
for _, f := range pkg.Files {
for _, d := range f.Decls {
ast.Walk(&walker{desired}, d)
}
}
}
// some constants confuse cgo into thinking they're external symbols for some reason
// TODO debug cgo
var hacknames = map[string]string{
"_INVALID_HANDLE_VALUE": "x_INVALID_HANDLE_VALUE",
}
func hacknamesPreamble() string {
if len(hacknames) == 0 {
return ""
}
// keep sorted for git
hn := make([]string, 0, len(hacknames))
for origname, _ := range hacknames {
hn = append(hn, origname)
}
sort.Strings(hn)
s := "// /* because cgo has issues with these */\n"
s += "// #include <stdint.h>\n"
for _, origname := range hn {
s += "// uintptr_t " + hacknames[origname] + " = (uintptr_t) (" +
origname[1:] + ");\n" // strip leading _
}
return s
}
func preamble(pkg string) string {
return "// autogenerated by windowsconstgen; do not edit\n" +
"package " + pkg + "\n"
}
func main() {
if len(os.Args) < 3 {
panic("usage: " + os.Args[0] + " path goarch [go-command-options...]")
}
pkgpath := os.Args[1]
targetarch := os.Args[2]
goopts := os.Args[3:] // valid if len(os.Args) == 3; in that case this will just be a slice of length zero
pkg := getPackage(pkgpath)
gatherNames(pkg)
// if we still have some known, I didn't clean things up completely
knowns := ""
for ident, kind := range known {
if kind != "var" && kind != "const" {
continue
}
knowns += "\n" + ident + " (" + kind + ")"
}
if knowns != "" {
//ignore for now while I still migrate everything
// panic("error: the following are still known!" + knowns) // has a newline already
}
// keep sorted for git
consts := make([]string, 0, len(unknown))
for ident, _ := range unknown {
if hackname, ok := hacknames[ident]; ok {
consts = append(consts, hackname)
continue
}
consts = append(consts, ident)
}
sort.Strings(consts)
// thanks to james4k in irc.freenode.net/#go-nuts
tmpdir, err := ioutil.TempDir("", "windowsconstgen")
if err != nil {
panic(err)
}
genoutname := filepath.Join(tmpdir, "gen.go")
f, err := os.Create(genoutname)
if err != nil {
panic(err)
}
fmt.Fprintf(f, "%s" +
"import \"fmt\"\n" +
"// #include <windows.h>\n" +
"// #include <commctrl.h>\n" +
"%s" +
"import \"C\"\n" +
"func main() {\n" +
" fmt.Println(%q)\n",
preamble("main"), hacknamesPreamble(), preamble("ui"))
for _, ident := range consts {
if ident[0] == 'x' {
// hack name; strip the leading x (but not the _ after it) from the constant name but keep the value name unchanged
fmt.Fprintf(f, " fmt.Println(\"const %s =\", C.%s)\n", ident[1:], ident)
continue
}
// not a hack name; strip the leading _ from the value name but keep the constant name unchanged
fmt.Fprintf(f, " fmt.Println(\"const %s =\", C.%s)\n", ident, ident[1:])
}
fmt.Fprintf(f, "}\n")
f.Close()
cmd := exec.Command("go", "run")
cmd.Args = append(cmd.Args, goopts...) // valid if len(goopts) == 0; in that case this will just be a no-op
cmd.Args = append(cmd.Args, genoutname)
f, err = os.Create(filepath.Join(pkgpath, "zconstants_windows_" + targetarch + ".go"))
if err != nil {
panic(err)
}
defer f.Close()
cmd.Stdout = f
cmd.Stderr = os.Stderr
cmd.Env = append(cmd.Env, os.Environ()...) // otherwise $PATH doesn't get carried over and things mysteriously fail
cmd.Env = append(cmd.Env,
"GOOS=windows",
"GOARCH=" + targetarch,
"CGO_ENABLED=1") // needed as it's not set by default in cross-compiles
err = cmd.Run()
if err != nil {
// TODO find a way to get the exit code
os.Exit(1)
}
// TODO remove the temporary directory
}
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