mirror of https://github.com/rust-lang/rust
61 lines
1.7 KiB
Rust
61 lines
1.7 KiB
Rust
//@ compile-flags: -O
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#![crate_type = "lib"]
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#![allow(incomplete_features)]
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#![feature(unsized_locals, unsized_fn_params)]
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use std::cell::Cell;
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use std::hint;
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// Check to make sure that we can deduce the `readonly` attribute from function bodies for
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// parameters passed indirectly.
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pub struct BigStruct {
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blah: [i32; 1024],
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}
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pub struct BigCellContainer {
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blah: [Cell<i32>; 1024],
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}
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// The by-value parameter for this big struct can be marked readonly.
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//
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// CHECK: @use_big_struct_immutably({{.*}} readonly {{.*}} %big_struct)
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#[no_mangle]
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pub fn use_big_struct_immutably(big_struct: BigStruct) {
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hint::black_box(&big_struct);
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}
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// The by-value parameter for this big struct can't be marked readonly, because we mutate it.
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//
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// CHECK-NOT: @use_big_struct_mutably({{.*}} readonly {{.*}} %big_struct)
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#[no_mangle]
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pub fn use_big_struct_mutably(mut big_struct: BigStruct) {
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big_struct.blah[987] = 654;
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hint::black_box(&big_struct);
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}
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// The by-value parameter for this big struct can't be marked readonly, because it contains
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// UnsafeCell.
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//
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// CHECK-NOT: @use_big_cell_container({{.*}} readonly {{.*}} %big_cell_container)
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#[no_mangle]
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pub fn use_big_cell_container(big_cell_container: BigCellContainer) {
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hint::black_box(&big_cell_container);
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}
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// Make sure that we don't mistakenly mark a big struct as `readonly` when passed through a generic
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// type parameter if it contains UnsafeCell.
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//
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// CHECK-NOT: @use_something({{.*}} readonly {{.*}} %something)
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#[no_mangle]
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#[inline(never)]
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pub fn use_something<T>(something: T) {
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hint::black_box(&something);
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}
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#[no_mangle]
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pub fn forward_big_cell_container(big_cell_container: BigCellContainer) {
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use_something(big_cell_container)
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}
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