evan/esp32-lua-api
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

perf(runtime): open only the stdlib libraries the Lua sources use

Browse Source 
io, coroutine, utf8 and debug have zero call sites across every module and
app, and each one's tables and closures are live heap in every app's state.
Selective luaL_requiref replaces luaL_openlibs; os stays for one os.date.

Measured in the emulator: VM+stdlib baseline 24.4kB -> 21.3kB live.
This commit is contained in:
Evan Reichard
2026-08-08 11:31:06 -04:00
parent 873e003c45
commit 5cec396697
1 changed files with 13 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files
native/src/runtime/runtime.cpp
+13 -1
View File
@@ -65,7 +65,19 @@ bool Runtime::open() {
if (!state_)
return false;
*static_cast<Runtime**>(lua_getextraspace(state_)) = this;
luaL_openlibs(state_);
// Only the libraries the Lua sources here actually reference. io, coroutine,
// utf8 and debug have zero call sites across every module and app, and each
// one's tables and closures are live heap in every app's state.
static const luaL_Reg kLibs[] = {
{LUA_GNAME, luaopen_base}, {LUA_LOADLIBNAME, luaopen_package},
{LUA_TABLIBNAME, luaopen_table}, {LUA_STRLIBNAME, luaopen_string},
{LUA_MATHLIBNAME, luaopen_math}, {LUA_OSLIBNAME, luaopen_os},
{nullptr, nullptr},
};
for (const luaL_Reg* lib = kLibs; lib->func; lib++) {
luaL_requiref(state_, lib->name, lib->func, 1);
lua_pop(state_, 1);
}
// Primary Namespaces
bindings::registerBle(state_);