38 lines
1.2 KiB
Rust
38 lines
1.2 KiB
Rust
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// compile-flags: -O
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#![crate_type = "lib"]
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#![feature(core_intrinsics)]
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// Check that we annotate size loads from vtables with 0..(isize::MAX + 1) range metadata.
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pub trait Trait {
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fn f(&self);
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}
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// Note that rustc uses inclusive bounds, but LLVM uses exclusive bounds for range metadata.
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// CHECK-LABEL: @generate_exclusive_bound
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#[no_mangle]
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pub fn generate_exclusive_bound() -> usize {
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// CHECK: ret [[USIZE:i[0-9]+]] [[EXCLUSIVE_BOUND:[-0-9]+]]
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isize::MAX as usize + 1
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}
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// CHECK-LABEL: @size_load_from_size_of_val
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#[no_mangle]
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pub fn size_load_from_size_of_val(x: &dyn Trait) -> usize {
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// CHECK: {{%[0-9]+}} = load [[USIZE]], {{.+}} !range [[RANGE_META:![0-9]+]]
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core::mem::size_of_val(x)
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}
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// CHECK-LABEL: @size_load_from_vtable_size_intrinsic
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#[no_mangle]
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pub unsafe fn size_load_from_vtable_size_intrinsic(x: &dyn Trait) -> usize {
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let (data, vtable): (*const (), *const ()) = core::mem::transmute(x);
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// CHECK: {{%[0-9]+}} = load [[USIZE]], {{.+}} !range [[RANGE_META]]
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let size = core::intrinsics::vtable_size(vtable);
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// make this function unique so it doesn't get merged with the previous
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size + 1
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}
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// CHECK: [[RANGE_META]] = !{[[USIZE]] 0, [[USIZE]] [[EXCLUSIVE_BOUND]]}
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