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git.proxmox.com Git - rustc.git/blob - compiler/rustc_data_structures/src/stack.rs
1 // This is the amount of bytes that need to be left on the stack before increasing the size.
2 // It must be at least as large as the stack required by any code that does not call
3 // `ensure_sufficient_stack`.
4 const RED_ZONE
: usize = 100 * 1024; // 100k
6 // Only the first stack that is pushed, grows exponentially (2^n * STACK_PER_RECURSION) from then
7 // on. This flag has performance relevant characteristics. Don't set it too high.
8 const STACK_PER_RECURSION
: usize = 1 * 1024 * 1024; // 1MB
10 /// Grows the stack on demand to prevent stack overflow. Call this in strategic locations
11 /// to "break up" recursive calls. E.g. almost any call to `visit_expr` or equivalent can benefit
14 /// Should not be sprinkled around carelessly, as it causes a little bit of overhead.
15 pub fn ensure_sufficient_stack
<R
>(f
: impl FnOnce() -> R
) -> R
{
16 stacker
::maybe_grow(RED_ZONE
, STACK_PER_RECURSION
, f
)