mirror of
https://github.com/rust-lang/rust-clippy
synced 2024-11-10 15:14:29 +00:00
01646457a9
Instead of just saying “this function's stack frame is big”, report: * the (presumed) size of the frame * the size and type of the largest local contributing to that size * the configurable limit that was exceeded (once)
55 lines
1.3 KiB
Rust
55 lines
1.3 KiB
Rust
//@ normalize-stderr-test: "\b10000(08|16|32)\b" -> "100$$PTR"
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//@ normalize-stderr-test: "\b2500(060|120)\b" -> "250$$PTR"
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#![allow(unused, incomplete_features)]
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#![warn(clippy::large_stack_frames)]
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#![feature(unsized_locals)]
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use std::hint::black_box;
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fn generic<T: Default>() {
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let x = T::default();
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black_box(&x);
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}
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fn unsized_local() {
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let x: dyn std::fmt::Display = *(Box::new(1) as Box<dyn std::fmt::Display>);
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black_box(&x);
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}
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struct ArrayDefault<const N: usize>([u8; N]);
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impl<const N: usize> Default for ArrayDefault<N> {
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fn default() -> Self {
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Self([0; N])
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}
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}
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fn many_small_arrays() {
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//~^ ERROR: this function may allocate
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let x = [0u8; 500_000];
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let x2 = [0u8; 500_000];
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let x3 = [0u8; 500_000];
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let x4 = [0u8; 500_000];
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let x5 = [0u8; 500_000];
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black_box((&x, &x2, &x3, &x4, &x5));
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}
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fn large_return_value() -> ArrayDefault<1_000_000> {
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//~^ ERROR: this function may allocate 1000000 bytes on the stack
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Default::default()
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}
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fn large_fn_arg(x: ArrayDefault<1_000_000>) {
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//~^ ERROR: this function may allocate
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black_box(&x);
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}
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fn has_large_closure() {
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let f = || black_box(&[0u8; 1_000_000]);
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//~^ ERROR: this function may allocate
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f();
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}
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fn main() {
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generic::<ArrayDefault<1_000_000>>();
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}
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