Incremental recompilation MIR ICE #110457
Labels
A-incr-comp
Area: Incremental compilation
C-bug
Category: This is a bug.
E-needs-test
Call for participation: Writing correctness tests.
I-ICE
Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️
S-has-mcve
Status: A Minimal Complete and Verifiable Example has been found for this issue
Comments
|
Assigning myself to minimize, hopefully writing some cargo-minimize docs for incremental on the way. |
matthiaskrgr
added
I-ICE
|
I have an MCVE (less minimal than I had hoped sadly) pub struct TileDef {
pub layer: (),
#[cfg(second)]
pub blend_graphic: String,
}
pub(crate) struct GameState {
pub(crate) tile_db: TileDb,
}
impl GameState {
fn inspect_mut(&mut self) {
egui_inspect_derive::expand! {}
}
}
fn new() -> GameState {
loop {}
}
fn main() {
let mut app = new();
app.inspect_mut();
}
// this is actually used
pub struct TileDb {
unknown_bg: TileDef,
}
impl std::fmt::Debug for TileDb {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
loop {}
}
}
pub struct PlatformOutput {
pub copied_text: String,
}
pub fn output_mut<R>(writer: impl FnOnce(&mut PlatformOutput) -> R) -> R {
loop {}
}Where use proc_macro::TokenStream;
use quote::quote;
#[proc_macro]
pub fn expand(_: TokenStream) -> TokenStream {
quote! {
output_mut(|o| o.copied_text = "".into());
output_mut(|o| o.copied_text = format!("{:?}", self.tile_db));
}
.into()
}I cannot manually expand the macro. I have already tried To reproduce, first compile it without any cfgs and then enable |
Nilstrieb
added
the
S-has-mcve
|
Bisection results using Nilstrieb/game-wip-dontplay@cc39bd4. searched nightlies: from nightly-2021-01-01 to nightly-2023-04-19 bisected with cargo-bisect-rustc v0.6.6Host triple: aarch64-unknown-linux-gnu cargo bisect-rustc --start 2021-01-01 --regress success --script ./repro.sh --access github |
|
I've found some potentially interesting bits: 128c128
< span: src/main.rs: 13: 9: 13: 40(#20),
---
> span: src/main.rs: 13: 9: 13: 40(#224),
165c165
< span: src/main.rs: 13: 9: 13: 40(#20),
---
> span: src/main.rs: 13: 9: 13: 40(#224),
230c230
< did: DefId(0: 20~mantle_diver[
---
> did: DefId(0: 21~mantle_diver[
248c248
< lint_root: HirId(DefId(0: 8~mantle_diver[
---
> lint_root: HirId(DefId(0: 9~mantle_diver[
264c264
< lint_root: HirId(DefId(0: 8~mantle_diver[
---
> lint_root: HirId(DefId(0: 9~mantle_diver[Some DefIds are different (makes sense, a field was added) and two spans changed their SyntaxContext drastically. These are spans that are expanded from the proc macro using beforeSteal{
value: RwLock(RefCell{
value: Some(Body{
basic_blocks: BasicBlocks{
basic_blocks: [
BasicBlockData{
statements: [
StorageLive(_3),
StorageLive(_4),
StorageLive(_5),
StorageLive(_6),
StorageLive(_7),
StorageLive(_8),
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_9=[
const""
],
_8=&_9,
_7=&(*_8),
_6=move_7as&[
&str
](Pointer(Unsize)),
StorageDead(_7),
StorageLive(_10),
StorageLive(_11),
StorageLive(_12),
StorageLive(_13),
StorageLive(_14),
StorageLive(_15),
StorageLive(_16),
_16=&(*(_1.0: &TileDb)),
_15=&(*_16)
],
terminator: Some(Terminator{
source_info: SourceInfo{
span: src/main.rs: 13: 9: 13: 40(#9),
scope: scope[
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kind: _14=core: : fmt: : ArgumentV1: : <'_>: : new_debug: : <TileDb>(move_15)->[
return: bb1,
unwind: bb9
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StorageDead(_11)
],
terminator: Some(Terminator{
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span: /home/nilsh/projects/rust/library/alloc/src/macros.rs: 120: 39: 120: 79(#9),
scope: scope[
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kind: _5=Arguments: : <'_>: : new_v1(move_6,
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return: bb2,
unwind: bb9
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scope: scope[
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unwind: bb9
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d58e
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impl#0
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} |
|
The fact that DefIds are different is not an issue, those are just a shorthand, what's relevant is the DefPathHash. |
|
Writing my progress here before forgetting about it. First execution:
Subtlety: expn5 and expn6 are created from the same span information, because egui_inspect_derive does not give the two closures different spans. So these expansions' hashes collide. Because hash collisions are bad, we increment the disambiguator for expn6. Second execution:
|
|
The ICE itself should have been removed by #111952, in which MIR building does not create |
cjgillot
added
the
E-needs-test
|
It just removed the symptom. The underlying bug is still there, and should be fixed by #111815. I don't think it currently possible to trigger the ICE, not until someone adds post-lowering expansions back. |
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See the minimal repro in a comment below.
The original was a repository that wasn't meant to be published (yet).
Meta
rustc --version --verbose:Build help
Needs SFML as a non-rust dependency.
See https://github.com/jeremyletang/rust-sfml#environment-variables
Easiest way should be to download the source and build it with CMake, and point the above environment variables to the appropriate locations in your download folder.
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