mirror of https://github.com/rust-lang/rust
85 lines
2.1 KiB
Rust
85 lines
2.1 KiB
Rust
//! This file tests that we correctly generate GEP instructions for DST
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//! field offsets.
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//@ compile-flags: -C no-prepopulate-passes -Copt-level=0
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#![crate_type = "lib"]
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#![feature(extern_types)]
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use std::ptr::addr_of;
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// Hack to get the correct type for usize
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// CHECK: @helper([[USIZE:i[0-9]+]] %_1)
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#[no_mangle]
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pub fn helper(_: usize) {
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}
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struct Dst<T: ?Sized> {
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x: u32,
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y: u8,
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z: T,
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}
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// CHECK: @dst_dyn_trait_offset(ptr align {{[0-9]+}} [[DATA_PTR:%.+]], ptr align {{[0-9]+}} [[VTABLE_PTR:%.+]])
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#[no_mangle]
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pub fn dst_dyn_trait_offset(s: &Dst<dyn Drop>) -> &dyn Drop {
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// The alignment of dyn trait is unknown, so we compute the offset based on align from the vtable.
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// CHECK: [[SIZE_PTR:%[0-9]+]] = getelementptr inbounds i8, ptr [[VTABLE_PTR]]
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// CHECK: load [[USIZE]], ptr [[SIZE_PTR]]
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// CHECK: [[ALIGN_PTR:%[0-9]+]] = getelementptr inbounds i8, ptr [[VTABLE_PTR]]
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// CHECK: load [[USIZE]], ptr [[ALIGN_PTR]]
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// CHECK: getelementptr inbounds i8, ptr [[DATA_PTR]]
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// CHECK-NEXT: insertvalue
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// CHECK-NEXT: insertvalue
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// CHECK-NEXT: ret
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&s.z
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}
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// CHECK-LABEL: @dst_slice_offset
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#[no_mangle]
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pub fn dst_slice_offset(s: &Dst<[u16]>) -> &[u16] {
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// The alignment of [u16] is known, so we generate a GEP directly.
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// CHECK: start:
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// CHECK-NEXT: getelementptr inbounds i8, {{.+}}, [[USIZE]] 6
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// CHECK-NEXT: insertvalue
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// CHECK-NEXT: insertvalue
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// CHECK-NEXT: ret
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&s.z
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}
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#[repr(packed)]
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struct PackedDstSlice {
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x: u32,
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y: u8,
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z: [u16],
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}
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// CHECK-LABEL: @packed_dst_slice_offset
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#[no_mangle]
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pub fn packed_dst_slice_offset(s: &PackedDstSlice) -> *const [u16] {
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// The alignment of [u16] is known, so we generate a GEP directly.
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// CHECK: start:
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// CHECK-NEXT: getelementptr inbounds i8, {{.+}}, [[USIZE]] 5
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// CHECK-NEXT: insertvalue
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// CHECK-NEXT: insertvalue
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// CHECK-NEXT: ret
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addr_of!(s.z)
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}
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extern {
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pub type Extern;
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}
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// CHECK-LABEL: @dst_extern
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#[no_mangle]
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pub fn dst_extern(s: &Dst<Extern>) -> &Extern {
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// Computing the alignment of an extern type is currently unsupported and just panics.
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// CHECK: call void @{{.+}}panic
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&s.z
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}
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