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//@ 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]]}
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