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Always put metatable in first upvalue.

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This commit is contained in:
Philipp Janda 2016-02-24 00:57:42 +01:00
parent 9fe38c654f
commit 4392bdcdd4
1 changed files with 6 additions and 4 deletions
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10
src/except.c
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@ -42,13 +42,13 @@ static void wrap(lua_State *L) {
lua_createtable(L, 1, 0);
lua_pushvalue(L, -2);
lua_rawseti(L, -2, 1);
lua_pushvalue(L, lua_upvalueindex(2));
lua_pushvalue(L, lua_upvalueindex(1));
lua_setmetatable(L, -2);
}
static int finalize(lua_State *L) {
if (!lua_toboolean(L, 1)) {
lua_pushvalue(L, lua_upvalueindex(1));
lua_pushvalue(L, lua_upvalueindex(2));
lua_call(L, 0, 0);
lua_settop(L, 2);
wrap(L);
@ -66,6 +66,7 @@ static int global_newtry(lua_State *L) {
lua_settop(L, 1);
if (lua_isnil(L, 1)) lua_pushcfunction(L, do_nothing);
lua_pushvalue(L, lua_upvalueindex(1));
lua_insert(L, -2);
lua_pushcclosure(L, finalize, 2);
return 1;
}
@ -75,7 +76,7 @@ static int global_newtry(lua_State *L) {
\*-------------------------------------------------------------------------*/
static int unwrap(lua_State *L) {
if (lua_istable(L, -1) && lua_getmetatable(L, -1)) {
int r = lua_rawequal(L, -1, lua_upvalueindex(2));
int r = lua_rawequal(L, -1, lua_upvalueindex(1));
lua_pop(L, 1);
if (r) {
lua_pushnil(L);
@ -106,7 +107,7 @@ static int protected_cont(lua_State *L) {
static int protected_(lua_State *L) {
int status;
lua_pushvalue(L, lua_upvalueindex(1));
lua_pushvalue(L, lua_upvalueindex(2));
lua_insert(L, 1);
status = lua_pcallk(L, lua_gettop(L) - 1, LUA_MULTRET, 0, 0, protected_cont);
return protected_finish(L, status, 0);
@ -115,6 +116,7 @@ static int protected_(lua_State *L) {
static int global_protect(lua_State *L) {
lua_settop(L, 1);
lua_pushvalue(L, lua_upvalueindex(1));
lua_insert(L, 1);
lua_pushcclosure(L, protected_, 2);
return 1;
}