func NewFunctionBuilder(fi *gi.FunctionInfo) *FunctionBuilder {
fb := new(FunctionBuilder)
fb.Function = fi
// prepare an array of ArgInfos
for i, n := 0, fi.NumArg(); i < n; i++ {
arg := fi.Arg(i)
fb.OrigArgs = append(fb.OrigArgs, arg)
}
// build skip list
var skiplist []int
for _, arg := range fb.OrigArgs {
ti := arg.Type()
len := ti.ArrayLength()
if len != -1 {
skiplist = append(skiplist, len)
}
clo := arg.Closure()
if clo != -1 {
skiplist = append(skiplist, clo)
}
des := arg.Destroy()
if des != -1 {
skiplist = append(skiplist, des)
}
}
// then walk over arguments
for i, ai := range fb.OrigArgs {
if IntSliceContains(skiplist, i) {
continue
}
ti := ai.Type()
switch ai.Direction() {
case gi.DIRECTION_IN:
fb.Args = append(fb.Args, FunctionBuilderArg{i, ai, ti})
case gi.DIRECTION_INOUT:
fb.Args = append(fb.Args, FunctionBuilderArg{i, ai, ti})
fb.Rets = append(fb.Rets, FunctionBuilderArg{i, ai, ti})
case gi.DIRECTION_OUT:
fb.Rets = append(fb.Rets, FunctionBuilderArg{i, ai, ti})
}
}
// add return value if it exists to 'rets'
if ret := fi.ReturnType(); ret != nil && ret.Tag() != gi.TYPE_TAG_VOID {
fb.Rets = append(fb.Rets, FunctionBuilderArg{-1, nil, ret})
}
// add GError special argument (if any)
if fi.Flags()&gi.FUNCTION_THROWS != 0 {
fb.Rets = append(fb.Rets, FunctionBuilderArg{-2, nil, nil})
}
return fb
}
func CFuncForwardDeclaration(fi *gi.FunctionInfo, container *gi.BaseInfo) {
symbol := fi.Symbol()
if _, declared := declared_c_funcs[symbol]; declared {
return
}
declared_c_funcs[symbol] = true
flags := fi.Flags()
narg := fi.NumArg()
if flags&gi.FUNCTION_THROWS != 0 {
narg++
}
printf("extern %s %s(", CType(fi.ReturnType(), TypeNone), symbol)
if flags&gi.FUNCTION_IS_METHOD != 0 {
printf("%s", CTypeForInterface(container, TypePointer))
if narg > 0 {
printf(", ")
}
}
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 {
printf(", ")
}
if i == n-1 && flags&gi.FUNCTION_THROWS != 0 {
printf("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()
}
}
}
printf("%s", CType(t, TypeNone))
switch arg.Direction() {
case gi.DIRECTION_INOUT, gi.DIRECTION_OUT:
printf("*")
}
}
printf(");\n")
if closure_scope == gi.SCOPE_TYPE_INVALID {
return
}
// in case if the function takes callback, generate appropriate wrappers
// for Go (gc compiler mainly)
printf("#pragma GCC diagnostic ignored \"-Wunused-function\"\n")
printf("static %s _%s(", CType(fi.ReturnType(), TypeNone), symbol)
if flags&gi.FUNCTION_IS_METHOD != 0 {
printf("%s this", CTypeForInterface(container, TypePointer))
if narg > 0 {
printf(", ")
}
}
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 {
printf(", ")
}
if i == closure_callback {
// replace callback argument with Go function pointer
// and optional unique id (if scope is not CALL)
printf("void* gofunc")
continue
}
if i == n-1 && flags&gi.FUNCTION_THROWS != 0 {
printf("GError** arg%d", i)
continue
}
arg := fi.Arg(i)
printf("%s", CType(arg.Type(), TypeNone))
switch arg.Direction() {
case gi.DIRECTION_INOUT, gi.DIRECTION_OUT:
printf("*")
}
printf(" arg%d", i)
}
printf(") {\n")
// body
defcall := func(argprint func(i int, t *gi.TypeInfo)) {
printf("\t\t")
if ret := fi.ReturnType(); !(ret.Tag() == gi.TYPE_TAG_VOID && !ret.IsPointer()) {
printf("return ")
}
printf("%s(", symbol)
if flags&gi.FUNCTION_IS_METHOD != 0 {
printf("this")
if narg > 0 {
printf(", ")
}
}
for i, n := 0, narg; i < n; i++ {
arg := fi.Arg(i)
t := arg.Type()
if i != 0 {
printf(", ")
}
argprint(i, t)
}
printf(");\n")
}
printf("\tif (gofunc) {\n")
defcall(func(i int, t *gi.TypeInfo) {
switch i {
case closure_userdata:
printf("gofunc")
case closure_destroy:
printf("_c_callback_cleanup")
case closure_callback:
printf("_%s_c_wrapper", CType(t, TypeNone))
if closure_scope == gi.SCOPE_TYPE_ASYNC {
printf("_once")
}
default:
printf("arg%d", i)
}
})
printf("\t} else {\n")
defcall(func(i int, t *gi.TypeInfo) {
switch i {
case closure_userdata, closure_destroy, closure_callback:
printf("0")
default:
printf("arg%d", i)
}
})
printf("\t}\n")
printf("}\n")
}
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")
}