mirror of
https://github.com/rust-lang/rust.git
synced 2024-11-23 15:23:46 +00:00
645c0fddd2
Previously, it was only put on scalars with range validity invariants like bool, was uninit was obviously invalid for those. Since then, we have normatively declared all uninit primitives to be undefined behavior and can therefore put `noundef` on them. The remaining concern was the `mem::uninitialized` function, which cause quite a lot of UB in the older parts of the ecosystem. This function now doesn't return uninit values anymore, making users of it safe from this change. The only real sources of UB where people could encounter uninit primitives are `MaybeUninit::uninit().assume_init()`, which has always be clear in the docs about being UB and from heap allocations (like reading from the spare capacity of a vec. This is hopefully rare enough to not break anything.
190 lines
4.4 KiB
Rust
190 lines
4.4 KiB
Rust
// compile-flags: --target riscv64gc-unknown-linux-gnu -O -C no-prepopulate-passes
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// needs-llvm-components: riscv
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#![crate_type = "lib"]
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#![no_core]
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#![feature(no_core, lang_items)]
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#![allow(improper_ctypes)]
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#[lang = "sized"]
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trait Sized {}
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#[lang = "copy"]
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trait Copy {}
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impl Copy for bool {}
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impl Copy for i8 {}
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impl Copy for u8 {}
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impl Copy for i32 {}
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impl Copy for i64 {}
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impl Copy for u64 {}
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impl Copy for f32 {}
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impl Copy for f64 {}
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// CHECK: define void @f_void()
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#[no_mangle]
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pub extern "C" fn f_void() {}
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// CHECK: define noundef zeroext i1 @f_scalar_0(i1 noundef zeroext %a)
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#[no_mangle]
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pub extern "C" fn f_scalar_0(a: bool) -> bool {
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a
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}
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// CHECK: define noundef signext i8 @f_scalar_1(i8 noundef signext %x)
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#[no_mangle]
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pub extern "C" fn f_scalar_1(x: i8) -> i8 {
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x
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}
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// CHECK: define noundef zeroext i8 @f_scalar_2(i8 noundef zeroext %x)
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#[no_mangle]
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pub extern "C" fn f_scalar_2(x: u8) -> u8 {
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x
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}
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// CHECK: define noundef signext i32 @f_scalar_3(i32 noundef signext %x)
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#[no_mangle]
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pub extern "C" fn f_scalar_3(x: i32) -> u32 {
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x as u32
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}
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// CHECK: define noundef i64 @f_scalar_4(i64 noundef %x)
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#[no_mangle]
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pub extern "C" fn f_scalar_4(x: i64) -> i64 {
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x
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}
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// CHECK: define float @f_fp_scalar_1(float %0)
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#[no_mangle]
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pub extern "C" fn f_fp_scalar_1(x: f32) -> f32 {
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x
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}
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// CHECK: define double @f_fp_scalar_2(double %0)
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#[no_mangle]
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pub extern "C" fn f_fp_scalar_2(x: f64) -> f64 {
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x
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}
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#[repr(C)]
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pub struct Empty {}
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// CHECK: define void @f_agg_empty_struct()
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#[no_mangle]
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pub extern "C" fn f_agg_empty_struct(e: Empty) -> Empty {
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e
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}
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#[repr(C)]
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pub struct Tiny {
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a: u16,
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b: u16,
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c: u16,
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d: u16,
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}
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// CHECK: define void @f_agg_tiny(i64 %0)
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#[no_mangle]
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pub extern "C" fn f_agg_tiny(mut e: Tiny) {
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}
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// CHECK: define i64 @f_agg_tiny_ret()
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#[no_mangle]
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pub extern "C" fn f_agg_tiny_ret() -> Tiny {
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Tiny { a: 1, b: 2, c: 3, d: 4 }
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}
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#[repr(C)]
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pub struct Small {
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a: i64,
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b: *mut i64,
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}
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// CHECK: define void @f_agg_small([2 x i64] %0)
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#[no_mangle]
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pub extern "C" fn f_agg_small(mut x: Small) {
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}
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// CHECK: define [2 x i64] @f_agg_small_ret()
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#[no_mangle]
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pub extern "C" fn f_agg_small_ret() -> Small {
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Small { a: 1, b: 0 as *mut _ }
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}
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#[repr(C)]
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pub struct SmallAligned {
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a: i128,
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}
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// CHECK: define void @f_agg_small_aligned(i128 %0)
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#[no_mangle]
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pub extern "C" fn f_agg_small_aligned(mut x: SmallAligned) {
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}
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#[repr(C)]
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pub struct Large {
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a: i64,
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b: i64,
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c: i64,
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d: i64,
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}
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// CHECK: define void @f_agg_large({{%Large\*|ptr}} {{.*}}%x)
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#[no_mangle]
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pub extern "C" fn f_agg_large(mut x: Large) {
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}
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// CHECK: define void @f_agg_large_ret({{%Large\*|ptr}} {{.*}}sret{{.*}}, i32 noundef signext %i, i8 noundef signext %j)
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#[no_mangle]
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pub extern "C" fn f_agg_large_ret(i: i32, j: i8) -> Large {
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Large { a: 1, b: 2, c: 3, d: 4 }
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}
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// CHECK: define void @f_scalar_stack_1(i64 %0, [2 x i64] %1, i128 %2, {{%Large\*|ptr}} {{.*}}%d, i8 noundef zeroext %e, i8 noundef signext %f, i8 noundef %g, i8 noundef %h)
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#[no_mangle]
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pub extern "C" fn f_scalar_stack_1(
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a: Tiny,
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b: Small,
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c: SmallAligned,
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d: Large,
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e: u8,
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f: i8,
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g: u8,
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h: i8,
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) {
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}
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// CHECK: define void @f_scalar_stack_2({{%Large\*|ptr}} {{.*}}sret{{.*}} %0, i64 noundef %a, i128 %1, i128 %2, i64 noundef %d, i8 noundef zeroext %e, i8 noundef %f, i8 noundef %g)
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#[no_mangle]
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pub extern "C" fn f_scalar_stack_2(
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a: u64,
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b: SmallAligned,
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c: SmallAligned,
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d: u64,
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e: u8,
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f: i8,
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g: u8,
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) -> Large {
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Large { a: a as i64, b: e as i64, c: f as i64, d: g as i64 }
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}
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extern "C" {
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fn f_va_callee(_: i32, ...) -> i32;
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}
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#[no_mangle]
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pub unsafe extern "C" fn f_va_caller() {
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// CHECK: call noundef signext i32 (i32, ...) @f_va_callee(i32 noundef signext 1, i32 noundef signext 2, i64 noundef 3, double {{.*}}, double {{.*}}, i64 {{.*}}, [2 x i64] {{.*}}, i128 {{.*}}, {{%Large\*|ptr}} {{.*}})
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f_va_callee(
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1,
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2i32,
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3i64,
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4.0f64,
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5.0f64,
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Tiny { a: 1, b: 2, c: 3, d: 4 },
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Small { a: 10, b: 0 as *mut _ },
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SmallAligned { a: 11 },
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Large { a: 12, b: 13, c: 14, d: 15 },
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);
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// CHECK: call noundef signext i32 (i32, ...) @f_va_callee(i32 noundef signext 1, i32 noundef signext 2, i32 noundef signext 3, i32 noundef signext 4, i128 {{.*}}, i32 noundef signext 6, i32 noundef signext 7, i32 noundef 8, i32 noundef 9)
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f_va_callee(1, 2i32, 3i32, 4i32, SmallAligned { a: 5 }, 6i32, 7i32, 8i32, 9i32);
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}
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