78da577650
Cleanup blocks are declared with `bb (cleanup) = { ... }`.
`Call` and `Drop` terminators take an additional argument describing the
unwind action, which is one of the following:
* `UnwindContinue()`
* `UnwindUnreachable()`
* `UnwindTerminate(reason)`, where reason is `ReasonAbi` or `ReasonInCleanup`
* `UnwindCleanup(block)`
Also support unwind resume and unwind terminate terminators:
* `UnwindResume()`
* `UnwindTerminate(reason)`
69 lines
1.4 KiB
Rust
69 lines
1.4 KiB
Rust
// compile-flags: --crate-type=lib
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// edition:2021
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// needs-unwind
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#![feature(custom_mir, core_intrinsics)]
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use core::intrinsics::mir::*;
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// CHECK-LABEL: fn a()
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// CHECK: bb0: {
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// CHECK-NEXT: a() -> [return: bb1, unwind unreachable];
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#[custom_mir(dialect = "runtime", phase = "optimized")]
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pub fn a() {
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mir!(
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{
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Call(RET = a(), bb1, UnwindUnreachable())
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}
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bb1 = {
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Return()
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}
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)
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}
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// CHECK-LABEL: fn b()
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// CHECK: bb0: {
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// CHECK-NEXT: b() -> [return: bb1, unwind continue];
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#[custom_mir(dialect = "runtime", phase = "optimized")]
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pub fn b() {
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mir!(
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{
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Call(RET = b(), bb1, UnwindContinue())
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}
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bb1 = {
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Return()
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}
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)
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}
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// CHECK-LABEL: fn c()
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// CHECK: bb0: {
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// CHECK-NEXT: c() -> [return: bb1, unwind terminate(abi)];
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#[custom_mir(dialect = "runtime", phase = "optimized")]
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pub fn c() {
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mir!(
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{
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Call(RET = c(), bb1, UnwindTerminate(ReasonAbi))
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}
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bb1 = {
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Return()
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}
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)
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}
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// CHECK-LABEL: fn d()
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// CHECK: bb0: {
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// CHECK-NEXT: d() -> [return: bb1, unwind: bb2];
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#[custom_mir(dialect = "runtime", phase = "optimized")]
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pub fn d() {
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mir!(
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{
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Call(RET = d(), bb1, UnwindCleanup(bb2))
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}
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bb1 = {
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Return()
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}
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bb2 (cleanup) = {
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UnwindResume()
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}
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)
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}
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