// Gets information about the interpreter runtime stack.
//
// This function fills parts of a Debug structure with an identification of
// the activation record of the function executing at a given level. Level
// 0 is the current running function, whereas level n+1 is the function that
// has called level n. When there are no errors, Getstack returns nil; when
// called with a level greater than the stack depth, it returns the error.
func (d *Debug) Getstack(level int) error {
if int(C.lua_getstack(d.l, C.int(level), d.d)) == 0 {
return errors.New("stack depth exceeded")
}
d.update()
return nil
}
// Returns the current stack trace
func (L *State) StackTrace() []LuaStackEntry {
r := []LuaStackEntry{}
var d C.lua_Debug
Sln := C.CString("Sln")
defer C.free(unsafe.Pointer(Sln))
for depth := 0; C.lua_getstack(L.s, C.int(depth), &d) > 0; depth++ {
C.lua_getinfo(L.s, Sln, &d)
ssb := make([]byte, C.LUA_IDSIZE)
for i := 0; i < C.LUA_IDSIZE; i++ {
ssb[i] = byte(d.short_src[i])
if ssb[i] == 0 {
ssb = ssb[:i]
break
}
}
ss := string(ssb)
r = append(r, LuaStackEntry{C.GoString(d.name), C.GoString(d.source), ss, int(d.currentline)})
}
return r
}
