Custom MIR: Support cleanup blocks #117330

tmiasko · 2023-10-28T21:59:24Z

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)

rustbot · 2023-10-28T21:59:31Z

r? @cjgillot

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rustbot · 2023-10-28T22:46:55Z

The Miri subtree was changed

cc @rust-lang/miri

library/core/src/intrinsics/mir.rs

RalfJung · 2023-10-29T07:59:59Z

library/core/src/intrinsics/mir.rs

@@ -110,15 +110,15 @@
 //!         let popped;
 //!
 //!         {
-//!             Call(_unused = Vec::push(v, value), pop)
+//!             Call(_unused = Vec::push(v, value), pop, Continue())


It seems like most of the time we want Continue. So maybe with can have Call always use the default unwind action of Continue, and then have CallWithUnwind for when one wants something else? Or maybe some other way to have default values.

RalfJung · 2023-10-29T08:00:30Z

library/core/src/intrinsics/mir.rs

 //!         }
 //!
 //!         pop = {
-//!             Call(popped = Vec::pop(v), drop)
+//!             Call(popped = Vec::pop(v), drop, Continue())


This makes me wonder if we should replace Call(popped = Vec::pop(v), drop) by Call(popped = Vec::pop(v), ReturnTo(drop)) or something like that... basically emulating named arguments. That's orthogonal to your PR though so I'd also be happy to do it as a follow-up if you prefer.

library/backtrace

compiler/rustc_mir_build/src/build/custom/parse.rs

library/core/src/intrinsics/mir.rs

cjgillot · 2023-11-13T23:39:52Z

@bors r+

bors · 2023-11-13T23:39:55Z

📌 Commit 3d89c80 has been approved by cjgillot

It is now in the queue for this repository.

bors · 2023-11-14T02:01:03Z

⌛ Testing commit 3d89c80 with merge 060f778...

…=cjgillot Custom MIR: Support cleanup blocks 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)`

bors · 2023-11-14T02:22:58Z

💔 Test failed - checks-actions

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)`

tmiasko · 2023-11-14T07:30:01Z

Cannot UnwindResume in a function that cannot unwind

Added needs-unwind to the test.

By the way, it seems quite suspect that MIR validity depends on the current panic strategy, since it means that code generation operates on invalid MIR when it originates from a crate with a different panic strategy.

tmiasko · 2023-11-14T08:00:21Z

@bors r=cjgillot

bors · 2023-11-14T08:00:23Z

📌 Commit 78da577 has been approved by cjgillot

It is now in the queue for this repository.

bors · 2023-11-14T08:53:28Z

⌛ Testing commit 78da577 with merge 5526682...

bors · 2023-11-14T10:54:33Z

☀️ Test successful - checks-actions
Approved by: cjgillot
Pushing 5526682 to master...

rust-timer · 2023-11-14T12:17:56Z

Finished benchmarking commit (5526682): comparison URL.

Overall result: ✅ improvements - no action needed

@rustbot label: -perf-regression

Instruction count

This is a highly reliable metric that was used to determine the overall result at the top of this comment.

	mean	range	count
Regressions ❌ (primary)	-	-	0
Regressions ❌ (secondary)	-	-	0
Improvements ✅ (primary)	-0.6%	[-0.6%, -0.6%]	1
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	-0.6%	[-0.6%, -0.6%]	1

Max RSS (memory usage)

Results

This is a less reliable metric that may be of interest but was not used to determine the overall result at the top of this comment.

	mean	range	count
Regressions ❌ (primary)	1.2%	[1.2%, 1.2%]	1
Regressions ❌ (secondary)	2.7%	[2.0%, 4.0%]	5
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-2.9%	[-3.9%, -2.4%]	3
All ❌✅ (primary)	1.2%	[1.2%, 1.2%]	1

Cycles

Results

This is a less reliable metric that may be of interest but was not used to determine the overall result at the top of this comment.

	mean	range	count
Regressions ❌ (primary)	-	-	0
Regressions ❌ (secondary)	3.1%	[2.0%, 4.2%]	5
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-2.1%	[-2.3%, -1.9%]	3
All ❌✅ (primary)	-	-	0

Binary size

This benchmark run did not return any relevant results for this metric.

Bootstrap: 672.988s -> 673.782s (0.12%)
Artifact size: 311.12 MiB -> 311.12 MiB (0.00%)

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Fix def-use check for call terminators #117359

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rustbot added this to the 1.76.0 milestone Nov 14, 2023

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Custom MIR: Support cleanup blocks #117330

Custom MIR: Support cleanup blocks #117330

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Custom MIR: Support cleanup blocks #117330

Custom MIR: Support cleanup blocks #117330

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Overall result: ✅ improvements - no action needed

Instruction count

Max RSS (memory usage)

Cycles

Binary size

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