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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:18:58 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:18:58 +0000 |
commit | a4b7ed7a42c716ab9f05e351f003d589124fd55d (patch) | |
tree | b620cd3f223850b28716e474e80c58059dca5dd4 /tests/codegen/deduced-param-attrs.rs | |
parent | Adding upstream version 1.67.1+dfsg1. (diff) | |
download | rustc-a4b7ed7a42c716ab9f05e351f003d589124fd55d.tar.xz rustc-a4b7ed7a42c716ab9f05e351f003d589124fd55d.zip |
Adding upstream version 1.68.2+dfsg1.upstream/1.68.2+dfsg1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'tests/codegen/deduced-param-attrs.rs')
-rw-r--r-- | tests/codegen/deduced-param-attrs.rs | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/tests/codegen/deduced-param-attrs.rs b/tests/codegen/deduced-param-attrs.rs new file mode 100644 index 000000000..153046eef --- /dev/null +++ b/tests/codegen/deduced-param-attrs.rs @@ -0,0 +1,60 @@ +// compile-flags: -O + +#![crate_type = "lib"] +#![allow(incomplete_features)] +#![feature(unsized_locals, unsized_fn_params)] + +use std::cell::Cell; +use std::hint; + +// Check to make sure that we can deduce the `readonly` attribute from function bodies for +// parameters passed indirectly. + +pub struct BigStruct { + blah: [i32; 1024], +} + +pub struct BigCellContainer { + blah: [Cell<i32>; 1024], +} + +// The by-value parameter for this big struct can be marked readonly. +// +// CHECK: @use_big_struct_immutably({{.*}} readonly {{.*}} %big_struct) +#[no_mangle] +pub fn use_big_struct_immutably(big_struct: BigStruct) { + hint::black_box(&big_struct); +} + +// The by-value parameter for this big struct can't be marked readonly, because we mutate it. +// +// CHECK-NOT: @use_big_struct_mutably({{.*}} readonly {{.*}} %big_struct) +#[no_mangle] +pub fn use_big_struct_mutably(mut big_struct: BigStruct) { + big_struct.blah[987] = 654; + hint::black_box(&big_struct); +} + +// The by-value parameter for this big struct can't be marked readonly, because it contains +// UnsafeCell. +// +// CHECK-NOT: @use_big_cell_container({{.*}} readonly {{.*}} %big_cell_container) +#[no_mangle] +pub fn use_big_cell_container(big_cell_container: BigCellContainer) { + hint::black_box(&big_cell_container); +} + +// Make sure that we don't mistakenly mark a big struct as `readonly` when passed through a generic +// type parameter if it contains UnsafeCell. +// +// CHECK-NOT: @use_something({{.*}} readonly {{.*}} %something) +#[no_mangle] +#[inline(never)] +pub fn use_something<T>(something: T) { + hint::black_box(&something); +} + +#[no_mangle] +pub fn forward_big_cell_container(big_cell_container: BigCellContainer) { + use_something(big_cell_container) +} |