Maximum Call Stack Depth ======================= {{#include ../links.md}} Limit How Stack Usage by Scripts ------------------------------- Rhai by default limits function calls to a maximum depth of 128 levels (16 levels in debug build). This limit may be changed via the `Engine::set_max_call_levels` method. A script exceeding the maximum call stack depth will terminate with an error result. This check can be disabled via the [`unchecked`] feature for higher performance (but higher risks as well). ```rust let mut engine = Engine::new(); engine.set_max_call_levels(10); // allow only up to 10 levels of function calls engine.set_max_call_levels(0); // allow no function calls at all (max depth = zero) ``` Setting Maximum Stack Depth -------------------------- When setting this limit, care must be also taken to the evaluation depth of each _statement_ within a function. It is entirely possible for a malicious script to embed a recursive call deep inside a nested expression or statement block (see [maximum statement depth]).