Communicate a little bit better about the checkstack constant
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23
src/util.rs
23
src/util.rs
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@ -55,15 +55,13 @@ where
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res
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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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// returning. Takes the lua_State, the expected stack size change, and an
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// operation to run. If the operation results in success, then the stack is
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// inspected to make sure the change in stack size matches the expected change
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// and otherwise this is a logic error and will panic. If the operation results
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// in an error, the stack is shrunk to the value before the call. If the
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// operation results in an error and the stack is smaller than the value before
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// the call, then this is unrecoverable and this will panic. If this function
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// panics, it will clear the stack before panicking.
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// Run an operation on a lua_State and automatically clean up the stack before returning. Takes the
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// lua_State, the expected stack size change, and an operation to run. If the operation results in
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// success, then the stack is inspected to make sure the change in stack size matches the expected
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// change and otherwise this is a logic error and will panic. If the operation results in an error,
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// the stack is shrunk to the value before the call. If the operation results in an error and the
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// stack is smaller than the value before the call, then this is unrecoverable and this will panic.
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// If this function panics, it will clear the stack before panicking.
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pub unsafe fn stack_err_guard<F, R>(state: *mut ffi::lua_State, change: c_int, op: F) -> Result<R>
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where
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F: FnOnce() -> Result<R>,
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@ -312,10 +310,13 @@ where
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// traceback, and if it is a WrappedPanic, does not modify it.
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#[cfg_attr(unwind, unwind)]
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pub unsafe extern "C" fn error_traceback(state: *mut ffi::lua_State) -> c_int {
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// I believe luaL_traceback requires this much free stack to not error.
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const LUA_TRACEBACK_STACK: c_int = 11;
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if ffi::lua_checkstack(state, 2) == 0 {
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// If we don't have enough stack space to even check the error type, do nothing
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} else if is_wrapped_error(state, 1) {
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let traceback = if ffi::lua_checkstack(state, 11) != 0 {
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let traceback = if ffi::lua_checkstack(state, LUA_TRACEBACK_STACK) != 0 {
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gc_guard(state, || {
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ffi::luaL_traceback(state, state, ptr::null(), 0);
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});
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@ -337,7 +338,7 @@ pub unsafe extern "C" fn error_traceback(state: *mut ffi::lua_State) -> c_int {
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},
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);
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} else if !is_wrapped_panic(state, 1) {
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if ffi::lua_checkstack(state, 11) != 0 {
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if ffi::lua_checkstack(state, LUA_TRACEBACK_STACK) != 0 {
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gc_guard(state, || {
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let s = ffi::lua_tostring(state, 1);
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let s = if s.is_null() {
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