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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)`
45 lines
993 B
Rust
45 lines
993 B
Rust
// skip-filecheck
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// Check that CopyProp does propagate return values of call terminators.
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// unit-test: CopyProp
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// needs-unwind
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#![feature(custom_mir, core_intrinsics)]
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use std::intrinsics::mir::*;
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#[inline(never)]
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fn dummy(x: u8) -> u8 {
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x
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}
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// EMIT_MIR calls.nrvo.CopyProp.diff
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fn nrvo() -> u8 {
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let y = dummy(5); // this should get NRVO
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y
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}
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// EMIT_MIR calls.multiple_edges.CopyProp.diff
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#[custom_mir(dialect = "runtime", phase = "initial")]
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fn multiple_edges(t: bool) -> u8 {
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mir! {
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let x: u8;
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{
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match t { true => bbt, _ => ret }
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}
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bbt = {
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Call(x = dummy(13), ret, UnwindContinue())
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}
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ret = {
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// `x` is not assigned on the `bb0 -> ret` edge,
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// so should not be marked as SSA for merging with `_0`.
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RET = x;
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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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// Make sure the function actually gets instantiated.
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nrvo();
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multiple_edges(false);
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}
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