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// +build ignore
// 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 {
switch n := node.(type) {
case *ast.Ident: // constant or structure?
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{}{}
}
}
case *ast.Comment: // function?
// TODO
}
return w
}
func gatherNames(pkg *ast.Package) {
desired := func(name string) bool {
return strings.HasPrefix(name, "c_") || // constants
strings.HasPrefix(name, "s_") // structs
}
for _, f := range pkg.Files {
for _, d := range f.Decls {
ast.Walk(&walker{desired}, d)
}
}
}
// for backwards compatibiilty reasons, Windows defines GetWindowLongPtr()/SetWindowLongPtr() as a macro which expands to GetWindowLong()/SetWindowLong() on 32-bit systems
// we'll just simulate that here
var gwlpNames = map[string]string{
"386": "etWindowLongW",
"amd64": "etWindowLongPtrW",
}
func writeLine(f *os.File, line string) {
fmt.Fprintf(f, "%s\n", line)
}
const cgopreamble = `
// #define UNICODE
// #define _UNICODE
// #define STRICT
// #define STRICT_TYPED_ITEMIDS
// /* get Windows version right; right now Windows XP */
// #define WINVER 0x0501
// #define _WIN32_WINNT 0x0501
// #define _WIN32_WINDOWS 0x0501 /* according to Microsoft's winperf.h */
// #define _WIN32_IE 0x0600 /* according to Microsoft's sdkddkver.h */
// #define NTDDI_VERSION 0x05010000 /* according to Microsoft's sdkddkver.h */
// #include <windows.h>
// #include <commctrl.h>
// #include <stdint.h>` // no closing newline; added by writeLine()
func writeConstCast(f *os.File, c string) {
cc := c[2:] // strip leading c_
fmt.Fprintf(f, "// uintptr_t %s = (uintptr_t) (%s);\n", c, cc)
}
func writeConstPrint(f *os.File, c string) {
fmt.Fprintf(f, "\tfmt.Fprintf(buf, \"const %%s = %%d\\n\", %q, C.%s)\n", c, c)
}
func writeStructPrint(f *os.File, s string) {
cs := s[2:] // strip leading s_
fmt.Fprintf(f, "\tt = reflect.TypeOf(C.%s{})\n", cs)
// TODO
}
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]
if _, ok := gwlpNames[targetarch]; !ok {
panic("unknown target windows/" + targetarch)
}
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
if len(known) > 0 {
knowns := ""
for ident, kind := range known {
if kind != "var" && kind != "const" {
continue
}
knowns += "\n" + ident + " (" + kind + ")"
}
panic("error: the following are still known!" + knowns) // has a newline already
}
// keep sorted for git
consts := make([]string, 0, len(unknown))
structs := make([]string, 0, len(unknown))
for ident, _ := range unknown {
if strings.HasPrefix(ident, "s_") {
structs = append(structs, ident)
continue
}
consts = append(consts, ident)
}
sort.Strings(consts)
sort.Strings(structs)
// 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)
}
writeLine(f, "package main")
writeLine(f, "import \"fmt\"")
writeLine(f, "import \"bytes\"")
writeLine(f, "import \"reflect\"")
writeLine(f, "import \"go/format\"")
writeLine(f, cgopreamble)
for _, c := range consts {
writeConstCast(f, c)
}
writeLine(f, "import \"C\"")
writeLine(f, "func main() {")
writeLine(f, "\tbuf := new(bytes.Buffer)")
writeLine(f, "\tfmt.Fprintln(buf, \"package ui\")")
for _, c := range consts {
writeConstPrint(f, c)
}
writeLine(f, "\tvar t reflect.Type")
writeLine(f, "\tvar s string")
for _, s := range structs {
writeStructPrint(f, s)
}
writeLine(f, "\tres, err := format.Source(buf.Bytes())")
writeLine(f, "\tif err != nil { panic(err) }")
writeLine(f, "\tfmt.Printf(\"%s\", res)")
writeLine(f, "}")
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
// we need to preserve the environment EXCEPT FOR the variables we're overriding
// thanks to raggi and smw in irc.freenode.net/#go-nuts
for _, ev := range os.Environ() {
if strings.HasPrefix(ev, "GOOS=") ||
strings.HasPrefix(ev, "GOARCH=") ||
strings.HasPrefix(ev, "CGO_ENABLED=") {
continue
}
cmd.Env = append(cmd.Env, ev)
}
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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