mirror of https://github.com/rust-lang/rust
127 lines
3.9 KiB
Rust
127 lines
3.9 KiB
Rust
// ignore-tidy-linelength
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//@ revisions:i686-linux x86_64-linux
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//@[i686-linux] compile-flags: --target i686-unknown-linux-gnu
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//@[i686-linux] needs-llvm-components: x86
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//@[x86_64-linux] compile-flags: --target x86_64-unknown-linux-gnu
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//@[x86_64-linux] needs-llvm-components: x86
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// Tests that we correctly copy arguments into allocas when the alignment of the byval argument
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// is different from the alignment of the Rust type.
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// For the following test cases:
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// All of the `*_decreases_alignment` functions should codegen to a direct call, since the
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// alignment is already sufficient.
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// All off the `*_increases_alignment` functions should copy the argument to an alloca
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// on i686-unknown-linux-gnu, since the alignment needs to be increased, and should codegen
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// to a direct call on x86_64-unknown-linux-gnu, where byval alignment matches Rust alignment.
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#![feature(no_core, lang_items)]
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#![crate_type = "lib"]
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#![no_std]
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#![no_core]
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#![allow(non_camel_case_types)]
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#[lang = "sized"]
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trait Sized {}
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#[lang = "freeze"]
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trait Freeze {}
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#[lang = "copy"]
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trait Copy {}
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// This type has align 1 in Rust, but as a byval argument on i686-linux, it will have align 4.
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#[repr(C)]
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#[repr(packed)]
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struct Align1 {
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x: u128,
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y: u128,
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z: u128,
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}
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// This type has align 16 in Rust, but as a byval argument on i686-linux, it will have align 4.
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#[repr(C)]
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#[repr(align(16))]
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struct Align16 {
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x: u128,
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y: u128,
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z: u128,
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}
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extern "C" {
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fn extern_c_align1(x: Align1);
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fn extern_c_align16(x: Align16);
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}
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// CHECK-LABEL: @rust_to_c_increases_alignment
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#[no_mangle]
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pub unsafe fn rust_to_c_increases_alignment(x: Align1) {
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// i686-linux: start:
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// i686-linux-NEXT: [[ALLOCA:%[0-9a-z]+]] = alloca [48 x i8], align 4
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// i686-linux-NEXT: call void @llvm.memcpy.{{.+}}(ptr {{.*}}align 4 {{.*}}[[ALLOCA]], ptr {{.*}}align 1 {{.*}}%x
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// i686-linux-NEXT: call void @extern_c_align1({{.+}} [[ALLOCA]])
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// x86_64-linux: start:
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// x86_64-linux-NEXT: call void @extern_c_align1
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extern_c_align1(x);
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}
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// CHECK-LABEL: @rust_to_c_decreases_alignment
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#[no_mangle]
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pub unsafe fn rust_to_c_decreases_alignment(x: Align16) {
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// CHECK: start:
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// CHECK-NEXT: call void @extern_c_align16
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extern_c_align16(x);
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}
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extern "Rust" {
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fn extern_rust_align1(x: Align1);
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fn extern_rust_align16(x: Align16);
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}
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// CHECK-LABEL: @c_to_rust_decreases_alignment
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#[no_mangle]
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pub unsafe extern "C" fn c_to_rust_decreases_alignment(x: Align1) {
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// CHECK: start:
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// CHECK-NEXT: call void @extern_rust_align1
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extern_rust_align1(x);
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}
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// CHECK-LABEL: @c_to_rust_increases_alignment
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#[no_mangle]
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pub unsafe extern "C" fn c_to_rust_increases_alignment(x: Align16) {
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// i686-linux: start:
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// i686-linux-NEXT: [[ALLOCA:%[0-9a-z]+]] = alloca [48 x i8], align 16
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// i686-linux-NEXT: call void @llvm.memcpy.{{.+}}(ptr {{.*}}align 16 {{.*}}[[ALLOCA]], ptr {{.*}}align 4 {{.*}}%0
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// i686-linux-NEXT: call void @extern_rust_align16({{.+}} [[ALLOCA]])
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// x86_64-linux: start:
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// x86_64-linux-NEXT: call void @extern_rust_align16
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extern_rust_align16(x);
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}
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extern "Rust" {
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fn extern_rust_ref_align1(x: &Align1);
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fn extern_rust_ref_align16(x: &Align16);
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}
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// CHECK-LABEL: @c_to_rust_ref_decreases_alignment
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#[no_mangle]
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pub unsafe extern "C" fn c_to_rust_ref_decreases_alignment(x: Align1) {
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// CHECK: start:
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// CHECK-NEXT: call void @extern_rust_ref_align1
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extern_rust_ref_align1(&x);
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}
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// CHECK-LABEL: @c_to_rust_ref_increases_alignment
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#[no_mangle]
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pub unsafe extern "C" fn c_to_rust_ref_increases_alignment(x: Align16) {
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// i686-linux: start:
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// i686-linux-NEXT: [[ALLOCA:%[0-9a-z]+]] = alloca [48 x i8], align 16
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// i686-linux-NEXT: call void @llvm.memcpy.{{.+}}(ptr {{.*}}align 16 {{.*}}[[ALLOCA]], ptr {{.*}}align 4 {{.*}}%0
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// i686-linux-NEXT: call void @extern_rust_ref_align16({{.+}} [[ALLOCA]])
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// x86_64-linux: start:
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// x86_64-linux-NEXT: call void @extern_rust_ref_align16
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extern_rust_ref_align16(&x);
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}
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