105 lines
2.7 KiB
Rust
105 lines
2.7 KiB
Rust
// EMIT_MIR_FOR_EACH_PANIC_STRATEGY
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//@ test-mir-pass: CopyProp
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#![feature(custom_mir, core_intrinsics, freeze)]
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#![allow(unused_assignments)]
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extern crate core;
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use core::intrinsics::mir::*;
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use core::marker::Freeze;
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fn opaque(_: impl Sized) -> bool {
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true
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}
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fn cmp_ref(a: &u8, b: &u8) -> bool {
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std::ptr::eq(a as *const u8, b as *const u8)
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}
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#[custom_mir(dialect = "analysis", phase = "post-cleanup")]
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fn compare_address() -> bool {
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// CHECK-LABEL: fn compare_address(
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// CHECK: bb0: {
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// CHECK-NEXT: _1 = const 5_u8;
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// CHECK-NEXT: _2 = &_1;
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// CHECK-NEXT: _3 = copy _1;
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// CHECK-NEXT: _4 = &_3;
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// CHECK-NEXT: _0 = cmp_ref(copy _2, copy _4)
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// CHECK: bb1: {
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// CHECK-NEXT: _0 = opaque::<u8>(copy _3)
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mir! {
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{
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let a = 5_u8;
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let r1 = &a;
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let b = a;
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// We cannot propagate the place `a`.
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let r2 = &b;
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Call(RET = cmp_ref(r1, r2), ReturnTo(next), UnwindContinue())
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}
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next = {
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// But we can propagate the value `a`.
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Call(RET = opaque(b), ReturnTo(ret), UnwindContinue())
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}
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ret = {
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Return()
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}
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}
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}
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/// Generic type `T` is `Freeze`, so shared borrows are immutable.
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#[custom_mir(dialect = "analysis", phase = "post-cleanup")]
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fn borrowed<T: Copy + Freeze>(x: T) -> bool {
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// CHECK-LABEL: fn borrowed(
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// CHECK: bb0: {
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// CHECK-NEXT: _3 = &_1;
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// CHECK-NEXT: _0 = opaque::<&T>(copy _3)
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// CHECK: bb1: {
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// CHECK-NEXT: _0 = opaque::<T>(copy _1)
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mir! {
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{
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let a = x;
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let r1 = &x;
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Call(RET = opaque(r1), ReturnTo(next), UnwindContinue())
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}
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next = {
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Call(RET = opaque(a), ReturnTo(ret), UnwindContinue())
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}
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ret = {
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Return()
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}
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}
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}
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/// Generic type `T` is not known to be `Freeze`, so shared borrows may be mutable.
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#[custom_mir(dialect = "analysis", phase = "post-cleanup")]
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fn non_freeze<T: Copy>(x: T) -> bool {
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// CHECK-LABEL: fn non_freeze(
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// CHECK: bb0: {
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// CHECK-NEXT: _2 = copy _1;
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// CHECK-NEXT: _3 = &_1;
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// CHECK-NEXT: _0 = opaque::<&T>(copy _3)
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// CHECK: bb1: {
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// CHECK-NEXT: _0 = opaque::<T>(copy _2)
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mir! {
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{
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let a = x;
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let r1 = &x;
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Call(RET = opaque(r1), ReturnTo(next), UnwindContinue())
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}
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next = {
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Call(RET = opaque(a), ReturnTo(ret), UnwindContinue())
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}
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ret = {
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Return()
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}
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}
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}
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fn main() {
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assert!(!compare_address());
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non_freeze(5);
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}
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// EMIT_MIR borrowed_local.compare_address.CopyProp.diff
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// EMIT_MIR borrowed_local.borrowed.CopyProp.diff
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// EMIT_MIR borrowed_local.non_freeze.CopyProp.diff
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