ICE: pretty: Unexpected def kind GlobalAsm

[matthiaskrgr]

auto-reduced (treereduce-rust):

//@compile-flags: -Zdump-mir=all
use std::arch::{asm, global_asm};

global_asm!("mov x0, {}", const constfn(5) + constfn(5));

original:

//@ only-aarch64
//@ run-pass
//@ needs-asm-support

use std::arch::{asm, global_asm};

fn const_generic<const X: usize>() -> usize {
    unsafe {
        let a: usize;
        asm!("mov {}, {}", out(reg) a, const X);
        a
    }
}

const fn constfn(x: usize) -> usize {
    x
}

fn main() {
    unsafe {
        let a: usize;
        asm!("mov {}, {}", out(reg) a, const 5);
        assert_eq!(a, 5);

        let b: usize;
        asm!("mov {}, {}", out(reg) b, const constfn(5));
        assert_eq!(b, 5);

        let c: usize;
        asm!("mov {}, {}", out(reg) c, const constfn(5) + constfn(5));
        assert_eq!(c, 10);
    }

    let d = const_generic::<5>();
    assert_eq!(d, 5);
}

global_asm!("mov x0, {}", const 5);
global_asm!("mov x0, {}", const constfn(5));
global_asm!("mov x0, {}", const constfn(5) + constfn(5));

Version information

rustc 1.87.0-nightly (a96fa317d 2025-03-09)
binary: rustc
commit-hash: a96fa317d78c78a9de996afd317603c6970efc0d
commit-date: 2025-03-09
host: x86_64-unknown-linux-gnu
release: 1.87.0-nightly
LLVM version: 20.1.0

Possibly related line of code:

rust/compiler/rustc_middle/src/mir/pretty.rs

Lines 651 to 663 in a96fa31

	}
	(DefKind::Static { safety: _, mutability: hir::Mutability::Mut, nested: false }, _) => {
	write!(w, "static mut ")?
	}
	(_, _) if is_function => write!(w, "fn ")?,
	(DefKind::AnonConst | DefKind::InlineConst, _) => {} // things like anon const, not an item
	_ => bug!("Unexpected def kind {:?}", kind),
	}
	ty::print::with_forced_impl_filename_line! {
	// see notes on #41697 elsewhere
	write!(w, "{}", tcx.def_path_str(def_id))?
	}

Command:
/home/matthias/.rustup/toolchains/master/bin/rustc -Zdump-mir=all

Program output

warning: unused import: `asm`
 --> /tmp/icemaker_global_tempdir.QU8cCxU1sTAN/rustc_testrunner_tmpdir_reporting.aSlZSaU8UpOL/mvce.rs:1:17
  |
1 | use std::arch::{asm, global_asm};
  |                 ^^^
  |
  = note: `#[warn(unused_imports)]` on by default

error[E0601]: `main` function not found in crate `mvce`
 --> /tmp/icemaker_global_tempdir.QU8cCxU1sTAN/rustc_testrunner_tmpdir_reporting.aSlZSaU8UpOL/mvce.rs:3:58
  |
3 | global_asm!("mov x0, {}", const constfn(5) + constfn(5));
  |                                                          ^ consider adding a `main` function to `/tmp/icemaker_global_tempdir.QU8cCxU1sTAN/rustc_testrunner_tmpdir_reporting.aSlZSaU8UpOL/mvce.rs`

error[E0425]: cannot find function `constfn` in this scope
 --> /tmp/icemaker_global_tempdir.QU8cCxU1sTAN/rustc_testrunner_tmpdir_reporting.aSlZSaU8UpOL/mvce.rs:3:33
  |
3 | global_asm!("mov x0, {}", const constfn(5) + constfn(5));
  |                                 ^^^^^^^ not found in this scope

error[E0425]: cannot find function `constfn` in this scope
 --> /tmp/icemaker_global_tempdir.QU8cCxU1sTAN/rustc_testrunner_tmpdir_reporting.aSlZSaU8UpOL/mvce.rs:3:46
  |
3 | global_asm!("mov x0, {}", const constfn(5) + constfn(5));
  |                                              ^^^^^^^ not found in this scope

error: internal compiler error: compiler/rustc_middle/src/mir/pretty.rs:657:14: Unexpected def kind GlobalAsm


thread 'rustc' panicked at compiler/rustc_middle/src/mir/pretty.rs:657:14:
Box<dyn Any>
stack backtrace:
   0:     0x7df246fba414 - <std::sys::backtrace::BacktraceLock::print::DisplayBacktrace as core::fmt::Display>::fmt::h52c7f0550840b8f9
   1:     0x7df247805bee - core::fmt::write::hee3b35a23fdf4ab3
   2:     0x7df248c21e91 - std::io::Write::write_fmt::hf49dbaa0e19fcf6b
   3:     0x7df246fba272 - std::sys::backtrace::BacktraceLock::print::hc7c25359d1b81c79
   4:     0x7df246fbcb98 - std::panicking::default_hook::{{closure}}::h384e40742b2d89cc
   5:     0x7df246fbc6b7 - std::panicking::default_hook::hdad5dc41d6be2842
   6:     0x7df24610c93f - std[af3b6eacc99eae20]::panicking::update_hook::<alloc[63c0b52934c5697b]::boxed::Box<rustc_driver_impl[c2cc76304700d71f]::install_ice_hook::{closure#1}>>::{closure#0}
   7:     0x7df246fbd403 - std::panicking::rust_panic_with_hook::h45ecb165eb6636c0
   8:     0x7df246149071 - std[af3b6eacc99eae20]::panicking::begin_panic::<rustc_errors[4dd87fb07da1f12a]::ExplicitBug>::{closure#0}
   9:     0x7df24613d596 - std[af3b6eacc99eae20]::sys::backtrace::__rust_end_short_backtrace::<std[af3b6eacc99eae20]::panicking::begin_panic<rustc_errors[4dd87fb07da1f12a]::ExplicitBug>::{closure#0}, !>
  10:     0x7df24613a12b - std[af3b6eacc99eae20]::panicking::begin_panic::<rustc_errors[4dd87fb07da1f12a]::ExplicitBug>
  11:     0x7df246152bd1 - <rustc_errors[4dd87fb07da1f12a]::diagnostic::BugAbort as rustc_errors[4dd87fb07da1f12a]::diagnostic::EmissionGuarantee>::emit_producing_guarantee
  12:     0x7df2467298da - rustc_middle[7aa79b75868ccd38]::util::bug::opt_span_bug_fmt::<rustc_span[6f95e09a31d512b0]::span_encoding::Span>::{closure#0}
  13:     0x7df24671143a - rustc_middle[7aa79b75868ccd38]::ty::context::tls::with_opt::<rustc_middle[7aa79b75868ccd38]::util::bug::opt_span_bug_fmt<rustc_span[6f95e09a31d512b0]::span_encoding::Span>::{closure#0}, !>::{closure#0}
  14:     0x7df2467112ab - rustc_middle[7aa79b75868ccd38]::ty::context::tls::with_context_opt::<rustc_middle[7aa79b75868ccd38]::ty::context::tls::with_opt<rustc_middle[7aa79b75868ccd38]::util::bug::opt_span_bug_fmt<rustc_span[6f95e09a31d512b0]::span_encoding::Span>::{closure#0}, !>::{closure#0}, !>
  15:     0x7df2449d86b0 - rustc_middle[7aa79b75868ccd38]::util::bug::bug_fmt
  16:     0x7df2466e6b55 - rustc_middle[7aa79b75868ccd38]::mir::pretty::write_mir_intro
  17:     0x7df24682d0ec - rustc_middle[7aa79b75868ccd38]::mir::pretty::write_mir_fn::<rustc_mir_transform[8791defed41099cf]::pass_manager::dump_mir_for_pass::{closure#0}>
  18:     0x7df24780b326 - rustc_mir_transform[8791defed41099cf]::mir_built
  19:     0x7df247809c47 - rustc_query_impl[417e50fa6d8979be]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[417e50fa6d8979be]::query_impl::mir_built::dynamic_query::{closure#2}::{closure#0}, rustc_middle[7aa79b75868ccd38]::query::erase::Erased<[u8; 8usize]>>
  20:     0x7df247b500cc - rustc_query_system[ed803ae4c980bdd6]::query::plumbing::try_execute_query::<rustc_query_impl[417e50fa6d8979be]::DynamicConfig<rustc_data_structures[2d87afbd7b950794]::vec_cache::VecCache<rustc_span[6f95e09a31d512b0]::def_id::LocalDefId, rustc_middle[7aa79b75868ccd38]::query::erase::Erased<[u8; 8usize]>, rustc_query_system[ed803ae4c980bdd6]::dep_graph::graph::DepNodeIndex>, false, false, false>, rustc_query_impl[417e50fa6d8979be]::plumbing::QueryCtxt, false>
  21:     0x7df247b4fc8b - rustc_query_impl[417e50fa6d8979be]::query_impl::mir_built::get_query_non_incr::__rust_end_short_backtrace
  22:     0x7df244e1b8bb - rustc_mir_transform[8791defed41099cf]::mir_promoted
  23:     0x7df247d2fe92 - rustc_query_impl[417e50fa6d8979be]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[417e50fa6d8979be]::query_impl::mir_promoted::dynamic_query::{closure#2}::{closure#0}, rustc_middle[7aa79b75868ccd38]::query::erase::Erased<[u8; 16usize]>>
  24:     0x7df247d3014e - rustc_query_system[ed803ae4c980bdd6]::query::plumbing::try_execute_query::<rustc_query_impl[417e50fa6d8979be]::DynamicConfig<rustc_data_structures[2d87afbd7b950794]::vec_cache::VecCache<rustc_span[6f95e09a31d512b0]::def_id::LocalDefId, rustc_middle[7aa79b75868ccd38]::query::erase::Erased<[u8; 16usize]>, rustc_query_system[ed803ae4c980bdd6]::dep_graph::graph::DepNodeIndex>, false, false, false>, rustc_query_impl[417e50fa6d8979be]::plumbing::QueryCtxt, false>
  25:     0x7df247d2fd8d - rustc_query_impl[417e50fa6d8979be]::query_impl::mir_promoted::get_query_non_incr::__rust_end_short_backtrace
  26:     0x7df248a1032d - rustc_query_impl[417e50fa6d8979be]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[417e50fa6d8979be]::query_impl::mir_borrowck::dynamic_query::{closure#2}::{closure#0}, rustc_middle[7aa79b75868ccd38]::query::erase::Erased<[u8; 8usize]>>
  27:     0x7df247b500cc - rustc_query_system[ed803ae4c980bdd6]::query::plumbing::try_execute_query::<rustc_query_impl[417e50fa6d8979be]::DynamicConfig<rustc_data_structures[2d87afbd7b950794]::vec_cache::VecCache<rustc_span[6f95e09a31d512b0]::def_id::LocalDefId, rustc_middle[7aa79b75868ccd38]::query::erase::Erased<[u8; 8usize]>, rustc_query_system[ed803ae4c980bdd6]::dep_graph::graph::DepNodeIndex>, false, false, false>, rustc_query_impl[417e50fa6d8979be]::plumbing::QueryCtxt, false>
  28:     0x7df247b4fbcb - rustc_query_impl[417e50fa6d8979be]::query_impl::mir_borrowck::get_query_non_incr::__rust_end_short_backtrace
  29:     0x7df247c5e53a - rustc_interface[91d83e268fb48030]::passes::run_required_analyses
  30:     0x7df2487872b8 - rustc_interface[91d83e268fb48030]::passes::analysis
  31:     0x7df248787297 - rustc_query_impl[417e50fa6d8979be]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[417e50fa6d8979be]::query_impl::analysis::dynamic_query::{closure#2}::{closure#0}, rustc_middle[7aa79b75868ccd38]::query::erase::Erased<[u8; 0usize]>>
  32:     0x7df2488f8201 - rustc_query_system[ed803ae4c980bdd6]::query::plumbing::try_execute_query::<rustc_query_impl[417e50fa6d8979be]::DynamicConfig<rustc_query_system[ed803ae4c980bdd6]::query::caches::SingleCache<rustc_middle[7aa79b75868ccd38]::query::erase::Erased<[u8; 0usize]>>, false, false, false>, rustc_query_impl[417e50fa6d8979be]::plumbing::QueryCtxt, false>
  33:     0x7df2488f7ef4 - rustc_query_impl[417e50fa6d8979be]::query_impl::analysis::get_query_non_incr::__rust_end_short_backtrace
  34:     0x7df2489474fc - rustc_interface[91d83e268fb48030]::passes::create_and_enter_global_ctxt::<core[ed80027c49f06cd6]::option::Option<rustc_interface[91d83e268fb48030]::queries::Linker>, rustc_driver_impl[c2cc76304700d71f]::run_compiler::{closure#0}::{closure#2}>::{closure#2}::{closure#0}
  35:     0x7df2489374ee - rustc_interface[91d83e268fb48030]::interface::run_compiler::<(), rustc_driver_impl[c2cc76304700d71f]::run_compiler::{closure#0}>::{closure#1}
  36:     0x7df248771248 - std[af3b6eacc99eae20]::sys::backtrace::__rust_begin_short_backtrace::<rustc_interface[91d83e268fb48030]::util::run_in_thread_with_globals<rustc_interface[91d83e268fb48030]::util::run_in_thread_pool_with_globals<rustc_interface[91d83e268fb48030]::interface::run_compiler<(), rustc_driver_impl[c2cc76304700d71f]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>
  37:     0x7df248771b34 - <<std[af3b6eacc99eae20]::thread::Builder>::spawn_unchecked_<rustc_interface[91d83e268fb48030]::util::run_in_thread_with_globals<rustc_interface[91d83e268fb48030]::util::run_in_thread_pool_with_globals<rustc_interface[91d83e268fb48030]::interface::run_compiler<(), rustc_driver_impl[c2cc76304700d71f]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>::{closure#1} as core[ed80027c49f06cd6]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  38:     0x7df248772f2b - std::sys::pal::unix::thread::Thread::new::thread_start::h3e3ca1693a666c64
  39:     0x7df2428a370a - <unknown>
  40:     0x7df242927aac - <unknown>
  41:                0x0 - <unknown>

note: we would appreciate a bug report: https://github.com/rust-lang/rust/issues/new?labels=C-bug%2C+I-ICE%2C+T-compiler&template=ice.md

note: please make sure that you have updated to the latest nightly

note: rustc 1.87.0-nightly (a96fa317d 2025-03-09) running on x86_64-unknown-linux-gnu

note: compiler flags: -Z dump-mir=all -Z dump-mir-dir=dir

query stack during panic:
#0 [mir_built] building MIR for `{global_asm#0}`
#1 [mir_promoted] promoting constants in MIR for `{global_asm#0}`
#2 [mir_borrowck] borrow-checking `{global_asm#0}`
#3 [analysis] running analysis passes on this crate
end of query stack
error: aborting due to 4 previous errors; 1 warning emitted

Some errors have detailed explanations: E0425, E0601.
For more information about an error, try `rustc --explain E0425`.

[folkertdev]

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