blob: 392ce1bb8ab811734542aaefc789d09b90f5c6ae [file] [log] [blame]
// Copyright 2013 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
/*
mkwinsyscall generates windows system call bodies
It parses all files specified on command line containing function
prototypes (like syscall_windows.go) and prints system call bodies
to standard output.
The prototypes are marked by lines beginning with "//sys" and read
like func declarations if //sys is replaced by func, but:
* The parameter lists must give a name for each argument. This
includes return parameters.
* The parameter lists must give a type for each argument:
the (x, y, z int) shorthand is not allowed.
* If the return parameter is an error number, it must be named err.
* If go func name needs to be different from its winapi dll name,
the winapi name could be specified at the end, after "=" sign, like
//sys LoadLibrary(libname string) (handle uint32, err error) = LoadLibraryA
* Each function that returns err needs to supply a condition, that
return value of winapi will be tested against to detect failure.
This would set err to windows "last-error", otherwise it will be nil.
The value can be provided at end of //sys declaration, like
//sys LoadLibrary(libname string) (handle uint32, err error) [failretval==-1] = LoadLibraryA
and is [failretval==0] by default.
Usage:
mkwinsyscall [flags] [path ...]
The flags are:
-output
Specify output file name (outputs to console if blank).
-trace
Generate print statement after every syscall.
*/
package main
import (
"bufio"
"bytes"
"errors"
"flag"
"fmt"
"go/format"
"go/parser"
"go/token"
"io"
"io/ioutil"
"log"
"os"
"path/filepath"
"runtime"
"sort"
"strconv"
"strings"
"text/template"
)
var (
filename = flag.String("output", "", "output file name (standard output if omitted)")
printTraceFlag = flag.Bool("trace", false, "generate print statement after every syscall")
systemDLL = flag.Bool("systemdll", true, "whether all DLLs should be loaded from the Windows system directory")
)
func trim(s string) string {
return strings.Trim(s, " \t")
}
var packageName string
func packagename() string {
return packageName
}
func syscalldot() string {
if packageName == "syscall" {
return ""
}
return "syscall."
}
// Param is function parameter
type Param struct {
Name string
Type string
fn *Fn
tmpVarIdx int
}
// tmpVar returns temp variable name that will be used to represent p during syscall.
func (p *Param) tmpVar() string {
if p.tmpVarIdx < 0 {
p.tmpVarIdx = p.fn.curTmpVarIdx
p.fn.curTmpVarIdx++
}
return fmt.Sprintf("_p%d", p.tmpVarIdx)
}
// BoolTmpVarCode returns source code for bool temp variable.
func (p *Param) BoolTmpVarCode() string {
const code = `var %s uint32
if %s {
%s = 1
} else {
%s = 0
}`
tmp := p.tmpVar()
return fmt.Sprintf(code, tmp, p.Name, tmp, tmp)
}
// BoolPointerTmpVarCode returns source code for bool temp variable.
func (p *Param) BoolPointerTmpVarCode() string {
const code = `var %s uint32
if *%s {
%s = 1
} else {
%s = 0
}`
tmp := p.tmpVar()
return fmt.Sprintf(code, tmp, p.Name, tmp, tmp)
}
// SliceTmpVarCode returns source code for slice temp variable.
func (p *Param) SliceTmpVarCode() string {
const code = `var %s *%s
if len(%s) > 0 {
%s = &%s[0]
}`
tmp := p.tmpVar()
return fmt.Sprintf(code, tmp, p.Type[2:], p.Name, tmp, p.Name)
}
// StringTmpVarCode returns source code for string temp variable.
func (p *Param) StringTmpVarCode() string {
errvar := p.fn.Rets.ErrorVarName()
if errvar == "" {
errvar = "_"
}
tmp := p.tmpVar()
const code = `var %s %s
%s, %s = %s(%s)`
s := fmt.Sprintf(code, tmp, p.fn.StrconvType(), tmp, errvar, p.fn.StrconvFunc(), p.Name)
if errvar == "-" {
return s
}
const morecode = `
if %s != nil {
return
}`
return s + fmt.Sprintf(morecode, errvar)
}
// TmpVarCode returns source code for temp variable.
func (p *Param) TmpVarCode() string {
switch {
case p.Type == "bool":
return p.BoolTmpVarCode()
case p.Type == "*bool":
return p.BoolPointerTmpVarCode()
case strings.HasPrefix(p.Type, "[]"):
return p.SliceTmpVarCode()
default:
return ""
}
}
// TmpVarReadbackCode returns source code for reading back the temp variable into the original variable.
func (p *Param) TmpVarReadbackCode() string {
switch {
case p.Type == "*bool":
return fmt.Sprintf("*%s = %s != 0", p.Name, p.tmpVar())
default:
return ""
}
}
// TmpVarHelperCode returns source code for helper's temp variable.
func (p *Param) TmpVarHelperCode() string {
if p.Type != "string" {
return ""
}
return p.StringTmpVarCode()
}
// SyscallArgList returns source code fragments representing p parameter
// in syscall. Slices are translated into 2 syscall parameters: pointer to
// the first element and length.
func (p *Param) SyscallArgList() []string {
t := p.HelperType()
var s string
switch {
case t == "*bool":
s = fmt.Sprintf("unsafe.Pointer(&%s)", p.tmpVar())
case t[0] == '*':
s = fmt.Sprintf("unsafe.Pointer(%s)", p.Name)
case t == "bool":
s = p.tmpVar()
case strings.HasPrefix(t, "[]"):
return []string{
fmt.Sprintf("uintptr(unsafe.Pointer(%s))", p.tmpVar()),
fmt.Sprintf("uintptr(len(%s))", p.Name),
}
default:
s = p.Name
}
return []string{fmt.Sprintf("uintptr(%s)", s)}
}
// IsError determines if p parameter is used to return error.
func (p *Param) IsError() bool {
return p.Name == "err" && p.Type == "error"
}
// HelperType returns type of parameter p used in helper function.
func (p *Param) HelperType() string {
if p.Type == "string" {
return p.fn.StrconvType()
}
return p.Type
}
// join concatenates parameters ps into a string with sep separator.
// Each parameter is converted into string by applying fn to it
// before conversion.
func join(ps []*Param, fn func(*Param) string, sep string) string {
if len(ps) == 0 {
return ""
}
a := make([]string, 0)
for _, p := range ps {
a = append(a, fn(p))
}
return strings.Join(a, sep)
}
// Rets describes function return parameters.
type Rets struct {
Name string
Type string
ReturnsError bool
FailCond string
}
// ErrorVarName returns error variable name for r.
func (r *Rets) ErrorVarName() string {
if r.ReturnsError {
return "err"
}
if r.Type == "error" {
return r.Name
}
return ""
}
// ToParams converts r into slice of *Param.
func (r *Rets) ToParams() []*Param {
ps := make([]*Param, 0)
if len(r.Name) > 0 {
ps = append(ps, &Param{Name: r.Name, Type: r.Type})
}
if r.ReturnsError {
ps = append(ps, &Param{Name: "err", Type: "error"})
}
return ps
}
// List returns source code of syscall return parameters.
func (r *Rets) List() string {
s := join(r.ToParams(), func(p *Param) string { return p.Name + " " + p.Type }, ", ")
if len(s) > 0 {
s = "(" + s + ")"
}
return s
}
// PrintList returns source code of trace printing part correspondent
// to syscall return values.
func (r *Rets) PrintList() string {
return join(r.ToParams(), func(p *Param) string { return fmt.Sprintf(`"%s=", %s, `, p.Name, p.Name) }, `", ", `)
}
// SetReturnValuesCode returns source code that accepts syscall return values.
func (r *Rets) SetReturnValuesCode() string {
if r.Name == "" && !r.ReturnsError {
return ""
}
retvar := "r0"
if r.Name == "" {
retvar = "r1"
}
errvar := "_"
if r.ReturnsError {
errvar = "e1"
}
return fmt.Sprintf("%s, _, %s := ", retvar, errvar)
}
func (r *Rets) useLongHandleErrorCode(retvar string) string {
const code = `if %s {
if e1 != 0 {
err = errnoErr(e1)
} else {
err = %sEINVAL
}
}`
cond := retvar + " == 0"
if r.FailCond != "" {
cond = strings.Replace(r.FailCond, "failretval", retvar, 1)
}
return fmt.Sprintf(code, cond, syscalldot())
}
// SetErrorCode returns source code that sets return parameters.
func (r *Rets) SetErrorCode() string {
const code = `if r0 != 0 {
%s = %sErrno(r0)
}`
if r.Name == "" && !r.ReturnsError {
return ""
}
if r.Name == "" {
return r.useLongHandleErrorCode("r1")
}
if r.Type == "error" {
return fmt.Sprintf(code, r.Name, syscalldot())
}
s := ""
switch {
case r.Type[0] == '*':
s = fmt.Sprintf("%s = (%s)(unsafe.Pointer(r0))", r.Name, r.Type)
case r.Type == "bool":
s = fmt.Sprintf("%s = r0 != 0", r.Name)
default:
s = fmt.Sprintf("%s = %s(r0)", r.Name, r.Type)
}
if !r.ReturnsError {
return s
}
return s + "\n\t" + r.useLongHandleErrorCode(r.Name)
}
// Fn describes syscall function.
type Fn struct {
Name string
Params []*Param
Rets *Rets
PrintTrace bool
dllname string
dllfuncname string
src string
// TODO: get rid of this field and just use parameter index instead
curTmpVarIdx int // insure tmp variables have uniq names
}
// extractParams parses s to extract function parameters.
func extractParams(s string, f *Fn) ([]*Param, error) {
s = trim(s)
if s == "" {
return nil, nil
}
a := strings.Split(s, ",")
ps := make([]*Param, len(a))
for i := range ps {
s2 := trim(a[i])
b := strings.Split(s2, " ")
if len(b) != 2 {
b = strings.Split(s2, "\t")
if len(b) != 2 {
return nil, errors.New("Could not extract function parameter from \"" + s2 + "\"")
}
}
ps[i] = &Param{
Name: trim(b[0]),
Type: trim(b[1]),
fn: f,
tmpVarIdx: -1,
}
}
return ps, nil
}
// extractSection extracts text out of string s starting after start
// and ending just before end. found return value will indicate success,
// and prefix, body and suffix will contain correspondent parts of string s.
func extractSection(s string, start, end rune) (prefix, body, suffix string, found bool) {
s = trim(s)
if strings.HasPrefix(s, string(start)) {
// no prefix
body = s[1:]
} else {
a := strings.SplitN(s, string(start), 2)
if len(a) != 2 {
return "", "", s, false
}
prefix = a[0]
body = a[1]
}
a := strings.SplitN(body, string(end), 2)
if len(a) != 2 {
return "", "", "", false
}
return prefix, a[0], a[1], true
}
// newFn parses string s and return created function Fn.
func newFn(s string) (*Fn, error) {
s = trim(s)
f := &Fn{
Rets: &Rets{},
src: s,
PrintTrace: *printTraceFlag,
}
// function name and args
prefix, body, s, found := extractSection(s, '(', ')')
if !found || prefix == "" {
return nil, errors.New("Could not extract function name and parameters from \"" + f.src + "\"")
}
f.Name = prefix
var err error
f.Params, err = extractParams(body, f)
if err != nil {
return nil, err
}
// return values
_, body, s, found = extractSection(s, '(', ')')
if found {
r, err := extractParams(body, f)
if err != nil {
return nil, err
}
switch len(r) {
case 0:
case 1:
if r[0].IsError() {
f.Rets.ReturnsError = true
} else {
f.Rets.Name = r[0].Name
f.Rets.Type = r[0].Type
}
case 2:
if !r[1].IsError() {
return nil, errors.New("Only last windows error is allowed as second return value in \"" + f.src + "\"")
}
f.Rets.ReturnsError = true
f.Rets.Name = r[0].Name
f.Rets.Type = r[0].Type
default:
return nil, errors.New("Too many return values in \"" + f.src + "\"")
}
}
// fail condition
_, body, s, found = extractSection(s, '[', ']')
if found {
f.Rets.FailCond = body
}
// dll and dll function names
s = trim(s)
if s == "" {
return f, nil
}
if !strings.HasPrefix(s, "=") {
return nil, errors.New("Could not extract dll name from \"" + f.src + "\"")
}
s = trim(s[1:])
a := strings.Split(s, ".")
switch len(a) {
case 1:
f.dllfuncname = a[0]
case 2:
f.dllname = a[0]
f.dllfuncname = a[1]
default:
return nil, errors.New("Could not extract dll name from \"" + f.src + "\"")
}
return f, nil
}
// DLLName returns DLL name for function f.
func (f *Fn) DLLName() string {
if f.dllname == "" {
return "kernel32"
}
return f.dllname
}
// DLLName returns DLL function name for function f.
func (f *Fn) DLLFuncName() string {
if f.dllfuncname == "" {
return f.Name
}
return f.dllfuncname
}
// ParamList returns source code for function f parameters.
func (f *Fn) ParamList() string {
return join(f.Params, func(p *Param) string { return p.Name + " " + p.Type }, ", ")
}
// HelperParamList returns source code for helper function f parameters.
func (f *Fn) HelperParamList() string {
return join(f.Params, func(p *Param) string { return p.Name + " " + p.HelperType() }, ", ")
}
// ParamPrintList returns source code of trace printing part correspondent
// to syscall input parameters.
func (f *Fn) ParamPrintList() string {
return join(f.Params, func(p *Param) string { return fmt.Sprintf(`"%s=", %s, `, p.Name, p.Name) }, `", ", `)
}
// ParamCount return number of syscall parameters for function f.
func (f *Fn) ParamCount() int {
n := 0
for _, p := range f.Params {
n += len(p.SyscallArgList())
}
return n
}
// SyscallParamCount determines which version of Syscall/Syscall6/Syscall9/...
// to use. It returns parameter count for correspondent SyscallX function.
func (f *Fn) SyscallParamCount() int {
n := f.ParamCount()
switch {
case n <= 3:
return 3
case n <= 6:
return 6
case n <= 9:
return 9
case n <= 12:
return 12
case n <= 15:
return 15
default:
panic("too many arguments to system call")
}
}
// Syscall determines which SyscallX function to use for function f.
func (f *Fn) Syscall() string {
c := f.SyscallParamCount()
if c == 3 {
return syscalldot() + "Syscall"
}
return syscalldot() + "Syscall" + strconv.Itoa(c)
}
// SyscallParamList returns source code for SyscallX parameters for function f.
func (f *Fn) SyscallParamList() string {
a := make([]string, 0)
for _, p := range f.Params {
a = append(a, p.SyscallArgList()...)
}
for len(a) < f.SyscallParamCount() {
a = append(a, "0")
}
return strings.Join(a, ", ")
}
// HelperCallParamList returns source code of call into function f helper.
func (f *Fn) HelperCallParamList() string {
a := make([]string, 0, len(f.Params))
for _, p := range f.Params {
s := p.Name
if p.Type == "string" {
s = p.tmpVar()
}
a = append(a, s)
}
return strings.Join(a, ", ")
}
// IsUTF16 is true, if f is W (utf16) function. It is false
// for all A (ascii) functions.
func (f *Fn) IsUTF16() bool {
s := f.DLLFuncName()
return s[len(s)-1] == 'W'
}
// StrconvFunc returns name of Go string to OS string function for f.
func (f *Fn) StrconvFunc() string {
if f.IsUTF16() {
return syscalldot() + "UTF16PtrFromString"
}
return syscalldot() + "BytePtrFromString"
}
// StrconvType returns Go type name used for OS string for f.
func (f *Fn) StrconvType() string {
if f.IsUTF16() {
return "*uint16"
}
return "*byte"
}
// HasStringParam is true, if f has at least one string parameter.
// Otherwise it is false.
func (f *Fn) HasStringParam() bool {
for _, p := range f.Params {
if p.Type == "string" {
return true
}
}
return false
}
// HelperName returns name of function f helper.
func (f *Fn) HelperName() string {
if !f.HasStringParam() {
return f.Name
}
return "_" + f.Name
}
// Source files and functions.
type Source struct {
Funcs []*Fn
Files []string
StdLibImports []string
ExternalImports []string
}
func (src *Source) Import(pkg string) {
src.StdLibImports = append(src.StdLibImports, pkg)
sort.Strings(src.StdLibImports)
}
func (src *Source) ExternalImport(pkg string) {
src.ExternalImports = append(src.ExternalImports, pkg)
sort.Strings(src.ExternalImports)
}
// ParseFiles parses files listed in fs and extracts all syscall
// functions listed in sys comments. It returns source files
// and functions collection *Source if successful.
func ParseFiles(fs []string) (*Source, error) {
src := &Source{
Funcs: make([]*Fn, 0),
Files: make([]string, 0),
StdLibImports: []string{
"unsafe",
},
ExternalImports: make([]string, 0),
}
for _, file := range fs {
if err := src.ParseFile(file); err != nil {
return nil, err
}
}
return src, nil
}
// DLLs return dll names for a source set src.
func (src *Source) DLLs() []string {
uniq := make(map[string]bool)
r := make([]string, 0)
for _, f := range src.Funcs {
name := f.DLLName()
if _, found := uniq[name]; !found {
uniq[name] = true
r = append(r, name)
}
}
return r
}
// ParseFile adds additional file path to a source set src.
func (src *Source) ParseFile(path string) error {
file, err := os.Open(path)
if err != nil {
return err
}
defer file.Close()
s := bufio.NewScanner(file)
for s.Scan() {
t := trim(s.Text())
if len(t) < 7 {
continue
}
if !strings.HasPrefix(t, "//sys") {
continue
}
t = t[5:]
if !(t[0] == ' ' || t[0] == '\t') {
continue
}
f, err := newFn(t[1:])
if err != nil {
return err
}
src.Funcs = append(src.Funcs, f)
}
if err := s.Err(); err != nil {
return err
}
src.Files = append(src.Files, path)
// get package name
fset := token.NewFileSet()
_, err = file.Seek(0, 0)
if err != nil {
return err
}
pkg, err := parser.ParseFile(fset, "", file, parser.PackageClauseOnly)
if err != nil {
return err
}
packageName = pkg.Name.Name
return nil
}
// IsStdRepo reports whether src is part of standard library.
func (src *Source) IsStdRepo() (bool, error) {
if len(src.Files) == 0 {
return false, errors.New("no input files provided")
}
abspath, err := filepath.Abs(src.Files[0])
if err != nil {
return false, err
}
goroot := runtime.GOROOT()
if runtime.GOOS == "windows" {
abspath = strings.ToLower(abspath)
goroot = strings.ToLower(goroot)
}
sep := string(os.PathSeparator)
if !strings.HasSuffix(goroot, sep) {
goroot += sep
}
return strings.HasPrefix(abspath, goroot), nil
}
// Generate output source file from a source set src.
func (src *Source) Generate(w io.Writer) error {
const (
pkgStd = iota // any package in std library
pkgXSysWindows // x/sys/windows package
pkgOther
)
isStdRepo, err := src.IsStdRepo()
if err != nil {
return err
}
var pkgtype int
switch {
case isStdRepo:
pkgtype = pkgStd
case packageName == "windows":
// TODO: this needs better logic than just using package name
pkgtype = pkgXSysWindows
default:
pkgtype = pkgOther
}
if *systemDLL {
switch pkgtype {
case pkgStd:
src.Import("internal/syscall/windows/sysdll")
case pkgXSysWindows:
default:
src.ExternalImport("golang.org/x/sys/windows")
}
}
if packageName != "syscall" {
src.Import("syscall")
}
funcMap := template.FuncMap{
"packagename": packagename,
"syscalldot": syscalldot,
"newlazydll": func(dll string) string {
arg := "\"" + dll + ".dll\""
if !*systemDLL {
return syscalldot() + "NewLazyDLL(" + arg + ")"
}
switch pkgtype {
case pkgStd:
return syscalldot() + "NewLazyDLL(sysdll.Add(" + arg + "))"
case pkgXSysWindows:
return "NewLazySystemDLL(" + arg + ")"
default:
return "windows.NewLazySystemDLL(" + arg + ")"
}
},
}
t := template.Must(template.New("main").Funcs(funcMap).Parse(srcTemplate))
err = t.Execute(w, src)
if err != nil {
return errors.New("Failed to execute template: " + err.Error())
}
return nil
}
func usage() {
fmt.Fprintf(os.Stderr, "usage: mkwinsyscall [flags] [path ...]\n")
flag.PrintDefaults()
os.Exit(1)
}
func main() {
flag.Usage = usage
flag.Parse()
if len(flag.Args()) <= 0 {
fmt.Fprintf(os.Stderr, "no files to parse provided\n")
usage()
}
src, err := ParseFiles(flag.Args())
if err != nil {
log.Fatal(err)
}
var buf bytes.Buffer
if err := src.Generate(&buf); err != nil {
log.Fatal(err)
}
data, err := format.Source(buf.Bytes())
if err != nil {
log.Fatal(err)
}
if *filename == "" {
_, err = os.Stdout.Write(data)
} else {
err = ioutil.WriteFile(*filename, data, 0644)
}
if err != nil {
log.Fatal(err)
}
}
// TODO: use println instead to print in the following template
const srcTemplate = `
{{define "main"}}// Code generated by 'go generate'; DO NOT EDIT.
package {{packagename}}
import (
{{range .StdLibImports}}"{{.}}"
{{end}}
{{range .ExternalImports}}"{{.}}"
{{end}}
)
var _ unsafe.Pointer
// Do the interface allocations only once for common
// Errno values.
const (
errnoERROR_IO_PENDING = 997
)
var (
errERROR_IO_PENDING error = {{syscalldot}}Errno(errnoERROR_IO_PENDING)
)
// errnoErr returns common boxed Errno values, to prevent
// allocations at runtime.
func errnoErr(e {{syscalldot}}Errno) error {
switch e {
case 0:
return nil
case errnoERROR_IO_PENDING:
return errERROR_IO_PENDING
}
// TODO: add more here, after collecting data on the common
// error values see on Windows. (perhaps when running
// all.bat?)
return e
}
var (
{{template "dlls" .}}
{{template "funcnames" .}})
{{range .Funcs}}{{if .HasStringParam}}{{template "helperbody" .}}{{end}}{{template "funcbody" .}}{{end}}
{{end}}
{{/* help functions */}}
{{define "dlls"}}{{range .DLLs}} mod{{.}} = {{newlazydll .}}
{{end}}{{end}}
{{define "funcnames"}}{{range .Funcs}} proc{{.DLLFuncName}} = mod{{.DLLName}}.NewProc("{{.DLLFuncName}}")
{{end}}{{end}}
{{define "helperbody"}}
func {{.Name}}({{.ParamList}}) {{template "results" .}}{
{{template "helpertmpvars" .}} return {{.HelperName}}({{.HelperCallParamList}})
}
{{end}}
{{define "funcbody"}}
func {{.HelperName}}({{.HelperParamList}}) {{template "results" .}}{
{{template "tmpvars" .}} {{template "syscall" .}} {{template "tmpvarsreadback" .}}
{{template "seterror" .}}{{template "printtrace" .}} return
}
{{end}}
{{define "helpertmpvars"}}{{range .Params}}{{if .TmpVarHelperCode}} {{.TmpVarHelperCode}}
{{end}}{{end}}{{end}}
{{define "tmpvars"}}{{range .Params}}{{if .TmpVarCode}} {{.TmpVarCode}}
{{end}}{{end}}{{end}}
{{define "results"}}{{if .Rets.List}}{{.Rets.List}} {{end}}{{end}}
{{define "syscall"}}{{.Rets.SetReturnValuesCode}}{{.Syscall}}(proc{{.DLLFuncName}}.Addr(), {{.ParamCount}}, {{.SyscallParamList}}){{end}}
{{define "tmpvarsreadback"}}{{range .Params}}{{if .TmpVarReadbackCode}}
{{.TmpVarReadbackCode}}{{end}}{{end}}{{end}}
{{define "seterror"}}{{if .Rets.SetErrorCode}} {{.Rets.SetErrorCode}}
{{end}}{{end}}
{{define "printtrace"}}{{if .PrintTrace}} print("SYSCALL: {{.Name}}(", {{.ParamPrintList}}") (", {{.Rets.PrintList}}")\n")
{{end}}{{end}}
`