mirror of
https://github.com/rust-lang/rust.git
synced 2024-11-30 02:33:55 +00:00
36 lines
1.1 KiB
Rust
36 lines
1.1 KiB
Rust
// compile-flags: -O -Z merge-functions=disabled
|
|
|
|
#![crate_type = "lib"]
|
|
#![feature(core_intrinsics)]
|
|
|
|
// Check that we annotate size loads from vtables with 0..(isize::MAX + 1) range metadata.
|
|
|
|
pub trait Trait {
|
|
fn f(&self);
|
|
}
|
|
|
|
// Note that rustc uses inclusive bounds, but LLVM uses exclusive bounds for range metadata.
|
|
// CHECK-LABEL: @generate_exclusive_bound
|
|
#[no_mangle]
|
|
pub fn generate_exclusive_bound() -> usize {
|
|
// CHECK: ret [[USIZE:i[0-9]+]] [[EXCLUSIVE_BOUND:[-0-9]+]]
|
|
isize::MAX as usize + 1
|
|
}
|
|
|
|
// CHECK-LABEL: @size_load_from_size_of_val
|
|
#[no_mangle]
|
|
pub fn size_load_from_size_of_val(x: &dyn Trait) -> usize {
|
|
// CHECK: {{%[0-9]+}} = load [[USIZE]], {{.+}} !range [[RANGE_META:![0-9]+]]
|
|
core::mem::size_of_val(x)
|
|
}
|
|
|
|
// CHECK-LABEL: @size_load_from_vtable_size_intrinsic
|
|
#[no_mangle]
|
|
pub unsafe fn size_load_from_vtable_size_intrinsic(x: &dyn Trait) -> usize {
|
|
let (data, vtable): (*const (), *const ()) = core::mem::transmute(x);
|
|
// CHECK: {{%[0-9]+}} = load [[USIZE]], {{.+}} !range [[RANGE_META]]
|
|
core::intrinsics::vtable_size(vtable)
|
|
}
|
|
|
|
// CHECK: [[RANGE_META]] = !{[[USIZE]] 0, [[USIZE]] [[EXCLUSIVE_BOUND]]}
|