A few small performance improvements
When 'debug_assertions' is not enabled, don't bother doing asserts in stack_guard / stack_err_guard. Also, add an optional feature not enabled by default to disable LUA_USE_APICHECK in release mode. Once the bugs in rlua that allow you to trigger LUA_USE_APICHECK are fixed, this feature will be the default behavior.
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@ -22,6 +22,12 @@ default = ["builtin-lua"]
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# * LUA_NUMBER as double
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# * LUA_EXTRASPACE is sizeof(void*)
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builtin-lua = ["gcc"]
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# Don't define LUA_USE_APICHECK if we are in release mode. When
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# debug_assertions are enabled, LUA_USE_APICHECK is enabled regardless. There
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# are still a few known ways to trigger LUA_USE_APICHECK checks with rlua, but
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# when these bugs are fixed, this option will go away and this behavior will be
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# the default.
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disable-lua-apicheck = []
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[dependencies]
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libc = { version = "0.2" }
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5
build.rs
5
build.rs
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@ -21,10 +21,9 @@ fn main() {
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config.define("LUA_USE_WINDOWS", None);
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}
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// Enables lua api checking, which has a slight performance penalty. We
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// could allow disabling this via cfg one day when there is much more
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// confidence in the soundness of the API.
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if cfg!(debug_assertions) || !cfg!(feature = "disable-lua-apicheck") {
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config.define("LUA_USE_APICHECK", None);
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}
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config
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.include("lua")
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14
src/util.rs
14
src/util.rs
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@ -24,6 +24,7 @@ pub unsafe fn stack_guard<F, R>(state: *mut ffi::lua_State, change: c_int, op: F
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where
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F: FnOnce() -> R,
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{
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if cfg!(debug_assertions) {
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let expected = ffi::lua_gettop(state) + change;
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lua_internal_assert!(
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state,
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@ -43,6 +44,9 @@ where
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);
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res
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} else {
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op()
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}
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}
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// Run an operation on a lua_State and automatically clean up the stack before
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@ -58,6 +62,7 @@ pub unsafe fn stack_err_guard<F, R>(state: *mut ffi::lua_State, change: c_int, o
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where
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F: FnOnce() -> Result<R>,
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{
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if cfg!(debug_assertions) {
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let expected = ffi::lua_gettop(state) + change;
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lua_internal_assert!(
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state,
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@ -87,8 +92,15 @@ where
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ffi::lua_settop(state, expected);
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}
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}
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res
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} else {
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let prev = ffi::lua_gettop(state) + change;
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let res = op();
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if res.is_err() {
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ffi::lua_settop(state, prev);
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}
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res
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}
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}
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// Call a function that calls into the Lua API and may trigger a Lua error (longjmp) in a safe way.
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