c/lua:coroutine continuation

c/lua/_demo/crroutine-continue/corroutine.go

@@ -0,0 +1,72 @@
+package main
+
+import (
+	"github.com/goplus/llgo/c"
+	"github.com/goplus/llgo/c/lua"
+)
+
+func countdownContinue(L *lua.State, status c.Int, ctx lua.KContext) c.Int {
+	return countdown(L)
+}
+
+func countdown(L *lua.State) c.Int {
+	arg := L.Tointeger(lua.Upvalueindex(1))
+	c.Printf(c.Str("resume called with %d\n"), arg)
+	if arg > 0 {
+		L.Pushinteger(arg - 1)
+		L.Replace(lua.Upvalueindex(1))
+		L.Pushinteger(arg)
+		return L.Yieldk(1, c.Pointer(uintptr(0)), countdownContinue)
+	}
+	return 0
+}
+
+func createCountdown(L *lua.State) c.Int {
+	max := L.Checkinteger(1)
+	L.Pushinteger(max)
+	L.Pushcclosure(countdown, 1)
+	return 1
+}
+
+func main() {
+	L := lua.Newstate()
+	L.Openlibs()
+	defer L.Close()
+	L.Register(c.Str("create_countdown"), createCountdown)
+
+	testcode := c.Str(`
+ local countdown = create_countdown(5)
+ local co = coroutine.create(countdown)
+ while true do
+     local success, value = coroutine.resume(co)
+     if not success then
+         print('Error:', value)
+         break
+     end
+     if value == nil then break end
+     print('Lua received:', value)
+ end
+ print('Countdown finished');
+	`)
+
+	if L.Dostring(testcode) != lua.OK {
+		c.Printf(c.Str("Error: %s\n"), L.Tostring(-1))
+	}
+
+	L.Openlibs()
+}
+
+/* Expected output:
+resume called with 5
+Lua received:   5
+resume called with 4
+Lua received:   4
+resume called with 3
+Lua received:   3
+resume called with 2
+Lua received:   2
+resume called with 1
+Lua received:   1
+resume called with 0
+Countdown finished
+*/

c/lua/lauxlib.go

@@ -14,6 +14,12 @@ import (
 
 // /* key, in the registry, for table of preloaded loaders */
 
+// llgo:link (*State).Checkinteger C.luaL_checkinteger
+func (L *State) Checkinteger(arg c.Int) Integer { return 0 }
+
+// llgo:link (*State).Checknumber C.luaL_checknumber
+func (L *State) Checknumber(arg c.Int) Number { return 0 }
+
 // llgo:link (*State).LError C.luaL_error
 func (L *State) LError(format *c.Char, __llgo_va_list ...any) c.Int { return 0 }
 

c/lua/lua.go

@@ -23,6 +23,14 @@ const (
 // ** space after that to help overflow detection)
 // */
 
+const (
+	REGISTRYINDEX = -MAXSTACK - 1000
+)
+
+func Upvalueindex(i c.Int) c.Int {
+	return c.Int(REGISTRYINDEX) - i
+}
+
 // /* thread status */
 const (
 	OK        = 0
@@ -438,9 +446,19 @@ func (L *State) Isnoneornil(n c.Int) bool     { return L.Type(n) <= 0 }
 // #define lua_pushliteral(L, s)	lua_pushstring(L, "" s)
 // #define lua_pushglobaltable(L)  ((void)lua_rawgeti(L, LUA_REGISTRYINDEX, LUA_RIDX_GLOBALS))
 
-// #define lua_insert(L,idx)	lua_rotate(L, (idx), 1)
-// #define lua_remove(L,idx)	(lua_rotate(L, (idx), -1), lua_pop(L, 1))
-// #define lua_replace(L,idx)	(lua_copy(L, -1, (idx)), lua_pop(L, 1))
+func (L *State) Insert(idx c.Int) {
+	L.Rotate(idx, 1)
+}
+
+func (L *State) Remove(idx c.Int) {
+	L.Rotate(idx, -1)
+	L.Pop(1)
+}
+
+func (L *State) Replace(idx c.Int) {
+	L.Copy(-1, idx)
+	L.Pop(1)
+}
 
 // /* }============================================================== */
 
@@ -478,10 +496,6 @@ const (
 // /*
 // ** Event masks
 // */
-// #define LUA_MASKCALL	(1 << LUA_HOOKCALL)
-// #define LUA_MASKRET	(1 << LUA_HOOKRET)
-// #define LUA_MASKLINE	(1 << LUA_HOOKLINE)
-// #define LUA_MASKCOUNT	(1 << LUA_HOOKCOUNT)
 
 const (
 	MASKCALL  = 1 << HOOKCOUNT

c/lua/luaconf.go

@@ -0,0 +1,21 @@
+package lua
+
+/*
+** {==================================================================
+** Macros that affect the API and must be stable (that is, must be the
+** same when you compile Lua and when you compile code that links to
+** Lua).
+** =====================================================================
+ */
+
+/*
+@@ LUAI_MAXSTACK limits the size of the Lua stack.
+** CHANGE it if you need a different limit. This limit is arbitrary;
+** its only purpose is to stop Lua from consuming unlimited stack
+** space (and to reserve some numbers for pseudo-indices).
+** (It must fit into max(size_t)/32 and max(int)/2.)
+*/
+
+const (
+	MAXSTACK = 1000000
+)