32 lines
1.0 KiB
Markdown
32 lines
1.0 KiB
Markdown
Maximum Call Stack Depth
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=======================
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{{#include ../links.md}}
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Limit How Stack Usage by Scripts
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-------------------------------
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Rhai by default limits function calls to a maximum depth of 128 levels (12 levels in debug build).
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This limit may be changed via the `Engine::set_max_call_levels` method.
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A script exceeding the maximum call stack depth will terminate with an error result.
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This check can be disabled via the [`unchecked`] feature for higher performance (but higher risks as well).
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```rust
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let mut engine = Engine::new();
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engine.set_max_call_levels(10); // allow only up to 10 levels of function calls
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engine.set_max_call_levels(0); // allow no function calls at all (max depth = zero)
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```
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Setting Maximum Stack Depth
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--------------------------
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When setting this limit, care must be also taken to the evaluation depth of each _statement_
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within a function. It is entirely possible for a malicious script to embed a recursive call deep
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inside a nested expression or statement block (see [maximum statement depth]).
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