func (this *binding_generator) c_func_forward_declaration(fi *gi.FunctionInfo) {
symbol := fi.Symbol()
if _, declared := this.declared_c_funcs[symbol]; declared {
return
}
this.declared_c_funcs[symbol] = true
container := fi.Container()
ph := printer_to(this.out_h)
pc := printer_to(this.out_c)
flags := fi.Flags()
narg := fi.NumArg()
if flags&gi.FUNCTION_THROWS != 0 {
narg++
}
ph("extern %s %s(", c_type(fi.ReturnType(), type_none), symbol)
if flags&gi.FUNCTION_IS_METHOD != 0 {
ph("%s", c_type_for_interface(container, type_pointer))
if narg > 0 {
ph(", ")
}
}
var closure_scope gi.ScopeType = gi.SCOPE_TYPE_INVALID
var closure_userdata int = -1
var closure_destroy int = -1
var closure_callback int = -1
for i, n := 0, narg; i < n; i++ {
if i != 0 {
ph(", ")
}
if i == n-1 && flags&gi.FUNCTION_THROWS != 0 {
ph("GError**")
continue
}
arg := fi.Arg(i)
t := arg.Type()
if uarg := arg.Closure(); uarg != -1 {
if t.Tag() == gi.TYPE_TAG_INTERFACE {
if t.Interface().Type() == gi.INFO_TYPE_CALLBACK {
if darg := arg.Destroy(); darg != -1 {
closure_destroy = darg
}
closure_userdata = uarg
closure_callback = i
closure_scope = arg.Scope()
}
}
}
ph("%s", c_type(t, type_none))
switch arg.Direction() {
case gi.DIRECTION_INOUT, gi.DIRECTION_OUT:
ph("*")
}
}
ph(");\n")
if closure_scope == gi.SCOPE_TYPE_INVALID {
return
}
// Also if this function is actually blacklisted, we don't want to
// generate wrappers
if config.is_object_blacklisted(gi.ToBaseInfo(fi)) {
return
}
// Or maybe this is a method and method's owner is blacklisted
if container != nil && config.is_object_blacklisted(container) {
return
}
// in case if the function takes callback, generate appropriate wrappers
// for Go (gc compiler mainly)
var tmp bytes.Buffer
p := printer_to(&tmp)
p("%s _%s(", c_type(fi.ReturnType(), type_none), symbol)
if flags&gi.FUNCTION_IS_METHOD != 0 {
p("%s this", c_type_for_interface(container, type_pointer))
if narg > 0 {
p(", ")
}
}
for i, n := 0, narg; i < n; i++ {
if i == closure_userdata || i == closure_destroy {
// skip userdata and destroy func in the wrapper
continue
}
if i != 0 {
p(", ")
}
if i == closure_callback {
// replace callback argument with Go function pointer
// and optional unique id (if scope is not CALL)
p("void* gofunc")
continue
}
if i == n-1 && flags&gi.FUNCTION_THROWS != 0 {
p("GError** arg%d", i)
continue
}
arg := fi.Arg(i)
p("%s", c_type(arg.Type(), type_none))
switch arg.Direction() {
case gi.DIRECTION_INOUT, gi.DIRECTION_OUT:
p("*")
}
p(" arg%d", i)
}
p(")")
ph("extern %s;\n", tmp.String())
pc("%s {\n", tmp.String())
// body
defcall := func(argprint func(i int, t *gi.TypeInfo)) {
pc("\t\t")
if ret := fi.ReturnType(); !(ret.Tag() == gi.TYPE_TAG_VOID && !ret.IsPointer()) {
pc("return ")
}
pc("%s(", symbol)
if flags&gi.FUNCTION_IS_METHOD != 0 {
pc("this")
if narg > 0 {
pc(", ")
}
}
for i, n := 0, narg; i < n; i++ {
arg := fi.Arg(i)
t := arg.Type()
if i != 0 {
pc(", ")
}
argprint(i, t)
}
pc(");\n")
}
pc("\tif (gofunc) {\n")
defcall(func(i int, t *gi.TypeInfo) {
switch i {
case closure_userdata:
pc("gofunc")
case closure_destroy:
pc("_c_callback_cleanup")
case closure_callback:
pc("_%s_c_wrapper", c_type(t, type_none))
if closure_scope == gi.SCOPE_TYPE_ASYNC {
pc("_once")
}
default:
pc("arg%d", i)
}
})
pc("\t} else {\n")
defcall(func(i int, t *gi.TypeInfo) {
switch i {
case closure_userdata, closure_destroy, closure_callback:
pc("0")
default:
pc("arg%d", i)
}
})
pc("\t}\n")
pc("}\n")
}
func (this *binding_generator) process_function_info(fi *gi.FunctionInfo) {
p := printer_to(&this.go_bindings)
var fullnm string
flags := fi.Flags()
name := fi.Name()
container := fi.Container()
// --- header
fb := new_function_builder(fi)
p("func ")
if flags&gi.FUNCTION_IS_METHOD != 0 {
// add receiver if it's a method
p("(this0 %s) ", go_type_for_interface(container, type_pointer|type_receiver))
fullnm = container.Name() + "."
}
switch {
case flags&gi.FUNCTION_IS_CONSTRUCTOR != 0:
// special names for constructors
name = fmt.Sprintf("New%s%s", container.Name(), ctor_suffix(name))
case flags&gi.FUNCTION_IS_METHOD == 0 && container != nil:
name = fmt.Sprintf("%s%s", container.Name(), lower_case_to_camel_case(name))
default:
name = fmt.Sprintf("%s", lower_case_to_camel_case(name))
}
fullnm += name
name = config.rename(fullnm, name)
p("%s(", name)
for i, arg := range fb.args {
if i != 0 {
p(", ")
}
p("%s0 %s", arg.arg_info.Name(), go_type(arg.type_info, type_none))
}
p(")")
switch len(fb.rets) {
case 0:
// do nothing if there are not return values
case 1:
if flags&gi.FUNCTION_IS_CONSTRUCTOR != 0 {
// override return types for constructors, We can't
// return generic widget here as C does. Go's type
// system is stronger.
p(" %s", go_type_for_interface(container, type_pointer|type_return))
break
}
if fb.rets[0].index == -2 {
p(" error")
} else {
p(" %s", go_type(fb.rets[0].type_info, type_return))
}
default:
p(" (")
for i, ret := range fb.rets {
if ret.index == -2 {
// special error type in Go to represent GError
p("error")
continue
}
p(go_type(ret.type_info, type_return))
if i != len(fb.rets)-1 {
p(", ")
}
}
p(")")
}
p(" {\n")
// --- body stage 1 (Go to C conversions)
// var declarations
if flags&gi.FUNCTION_IS_METHOD != 0 {
p("\tvar this1 %s\n", cgo_type_for_interface(container, type_pointer))
}
for _, arg := range fb.args {
p("\tvar %s1 %s\n", arg.arg_info.Name(), cgo_type(arg.type_info, type_none))
if al := arg.type_info.ArrayLength(); al != -1 {
arg := fb.orig_args[al]
p("\tvar %s1 %s\n", arg.Name(), cgo_type(arg.Type(), type_none))
}
}
for _, ret := range fb.rets {
if ret.index == -1 {
continue
}
if ret.index == -2 {
p("\tvar err1 *C.GError\n")
continue
}
if ret.arg_info.Direction() == gi.DIRECTION_INOUT {
continue
}
p("\tvar %s1 %s\n", ret.arg_info.Name(), cgo_type(ret.type_info, type_none))
if al := ret.type_info.ArrayLength(); al != -1 {
arg := fb.orig_args[al]
p("\tvar %s1 %s\n", arg.Name(), cgo_type(arg.Type(), type_none))
}
}
// conversions
if flags&gi.FUNCTION_IS_METHOD != 0 {
conv := go_to_cgo_for_interface(container, "this0", "this1", conv_pointer)
p("%s", print_lines_with_indent(conv))
}
for _, arg := range fb.args {
nm := arg.arg_info.Name()
conv := go_to_cgo(arg.type_info, nm+"0", nm+"1", conv_none)
p("%s", print_lines_with_indent(conv))
// register callback in the global map
if arg.type_info.Tag() == gi.TYPE_TAG_INTERFACE {
bi := arg.type_info.Interface()
if bi.Type() == gi.INFO_TYPE_CALLBACK {
if arg.arg_info.Scope() != gi.SCOPE_TYPE_CALL {
p("\t%sHolder.Grab(%s1)\n", config.gns, nm)
}
}
}
// array length
if len := arg.type_info.ArrayLength(); len != -1 {
lenarg := fb.orig_args[len]
conv = go_to_cgo(lenarg.Type(), "len("+nm+"0)", lenarg.Name()+"1", conv_none)
p("\t%s\n", conv)
}
}
// --- body stage 2 (the function call)
p("\t")
if fb.has_return_value() {
p("ret1 := ")
}
userdata, destroy, scope := fb.has_closure_argument()
p("C.")
if scope != gi.SCOPE_TYPE_INVALID {
p("_")
}
p("%s(", fi.Symbol())
if flags&gi.FUNCTION_IS_METHOD != 0 {
p("this1")
if len(fb.orig_args) > 0 {
p(", ")
}
}
for i, ri, n := 0, 0, len(fb.orig_args); i < n; i++ {
if i == userdata || i == destroy {
continue
}
oarg := fb.orig_args[i]
var arg string
dir := oarg.Direction()
if dir == gi.DIRECTION_INOUT || dir == gi.DIRECTION_OUT {
arg = fmt.Sprintf("&%s1", oarg.Name())
} else {
arg = fmt.Sprintf("%s1", oarg.Name())
}
if ri != 0 {
p(", ")
}
p("%s", arg)
ri++
}
if flags&gi.FUNCTION_THROWS != 0 {
p(", &err1")
}
p(")\n")
// --- body stage 3 (C to Go conversions)
// var declarations
for _, ret := range fb.rets {
switch ret.index {
case -1:
if flags&gi.FUNCTION_IS_CONSTRUCTOR != 0 {
p("\tvar ret2 %s\n", go_type_for_interface(container, type_pointer|type_return))
} else {
p("\tvar ret2 %s\n", go_type(ret.type_info, type_return))
}
case -2:
p("\tvar err2 error\n")
default:
p("\tvar %s2 %s\n", ret.arg_info.Name(), go_type(ret.type_info, type_return))
}
}
// conversions
for _, ret := range fb.rets {
if ret.index == -2 {
p("\tif err1 != nil {\n")
p("\t\terr2 = errors.New(C.GoString(((*_GError)(unsafe.Pointer(err1))).message))\n")
p("\t\tC.g_error_free(err1)\n")
p("\t}\n")
continue
}
var nm string
if ret.index == -1 {
nm = "ret"
} else {
nm = ret.arg_info.Name()
}
// array length
if len := ret.type_info.ArrayLength(); len != -1 {
lenarg := fb.orig_args[len]
p("\t%s2 = make(%s, %s)\n",
nm, go_type(ret.type_info, type_return),
lenarg.Name()+"1")
}
var ownership gi.Transfer
if ret.index == -1 {
ownership = fi.CallerOwns()
} else {
ownership = ret.arg_info.OwnershipTransfer()
if ret.arg_info.Direction() == gi.DIRECTION_INOUT {
// not sure if it's true in all cases, but so far
ownership = gi.TRANSFER_NOTHING
}
}
var conv string
if flags&gi.FUNCTION_IS_CONSTRUCTOR != 0 && ret.index == -1 {
conv = cgo_to_go_for_interface(container, "ret1", "ret2",
conv_pointer|ownership_to_conv_flags(ownership))
} else {
conv = cgo_to_go(ret.type_info, nm+"1", nm+"2",
ownership_to_conv_flags(ownership))
}
p("%s", print_lines_with_indent(conv))
}
// --- body stage 4 (return)
if len(fb.rets) == 0 {
p("}\n")
return
}
p("\treturn ")
for i, ret := range fb.rets {
var nm string
switch ret.index {
case -1:
nm = "ret2"
case -2:
nm = "err2"
default:
nm = ret.arg_info.Name() + "2"
}
if i != 0 {
p(", ")
}
p(nm)
}
p("\n}\n")
}