ICE: `assertion failed: bpos.to_u32() >= mbc.pos.to_u32() + mbc.bytes as u32`

[matthiaskrgr]

auto-reduced (treereduce-rust):

use std::arch::asm;

unsafe fn f6() {
    asm!(concat!(r#"lJ𐏿Æ�.𐏿�"#, "r} {}"));
}

original:

// Ensure inout asm! operands are marked as used by the liveness pass

//@ only-x86_64
//@ check-pass

#![allow(dead_code)]
#![warn(unused_assignments)]
#![warn(unused_variables)]

use std::arch::asm;

// Test the single inout case
unsafe fn f1(mut src: *const u8) {
    asm!("/*{0}*/b", inout(reg) src); //~ WARN value assigned to `src` is never read
}

unsafe fn f2(mut src: *const u8) -> *const u8 {
    asm!("/*{0}*/", inout(ComplexTup, 0 . 0.1.) src);
    src
}

// Test the split inout case
unsafe fn f3(mut src: *const u8) {
    asm!("/*{0}*/", inout(reg) src => src); //~ WARN value assigned to `src` is never read
}

unsafe fn f4(mut src: *const u8) -> *const u8 {
    asm!(c"/*{0}*/", weird_hygiene(reg) src => src);
    src
}

// Tests the use of field projections
struct S {
    field: *mut u8,
}

unsafe fn f5(src: &mut S) {
    asm!("/*{0}*/", inout(reg) src.field);
}

unsafe fn f6(src: &mut S) {
    asm!( concat ! ( r#"lJ𐏿Æ�.𐏿�"# , "r} {}" )     );
}

fn main() {}

Version information

rustc 1.82.0-nightly (edbc000fa 2024-08-24)
binary: rustc
commit-hash: edbc000fa4413f9ff92f4e5492f8ff497716ce48
commit-date: 2024-08-24
host: x86_64-unknown-linux-gnu
release: 1.82.0-nightly
LLVM version: 19.1.0

Command:
/home/matthias/.rustup/toolchains/master/bin/rustc

Program output

thread 'rustc' panicked at compiler/rustc_span/src/lib.rs:2028:17:
assertion failed: bpos.to_u32() >= mbc.pos.to_u32() + mbc.bytes as u32
stack backtrace:
   0:     0x7509459d6ebd - <std::sys::backtrace::BacktraceLock::print::DisplayBacktrace as core::fmt::Display>::fmt::hbbce437f95729b37
   1:     0x750946204c97 - core::fmt::write::h21e51fc45e851977
   2:     0x7509471b7a11 - std::io::Write::write_fmt::h7cbeab9f6ab42ce3
   3:     0x7509459d959b - std::panicking::default_hook::{{closure}}::h060ecf4ec754efbe
   4:     0x7509459d920e - std::panicking::default_hook::h23b9da54a073e9e1
   5:     0x750944b52f89 - std[5c43df6f1c3208ff]::panicking::update_hook::<alloc[34541d82da33361]::boxed::Box<rustc_driver_impl[2d5acae0b271c880]::install_ice_hook::{closure#0}>>::{closure#0}
   6:     0x7509459d9eb7 - std::panicking::rust_panic_with_hook::h143e179a7cc018c2
   7:     0x7509459d9b43 - std::panicking::begin_panic_handler::{{closure}}::hfe4ad1ee631377dc
   8:     0x7509459d7379 - std::sys::backtrace::__rust_end_short_backtrace::hc554e2748840d46e
   9:     0x7509459d9844 - rust_begin_unwind
  10:     0x750942bd3fc3 - core::panicking::panic_fmt::h27f74798f8132652
  11:     0x750942a7e2dc - core::panicking::panic::h792739f7b952660b
  12:     0x75094354bca4 - <rustc_span[694568e5274b44f6]::source_map::SourceMap>::lookup_char_pos
  13:     0x750947418e50 - <rustc_errors[595a87896474165e]::emitter::HumanEmitter>::get_multispan_max_line_num
  14:     0x75094741ff60 - <rustc_errors[595a87896474165e]::emitter::HumanEmitter>::emit_messages_default
  15:     0x750947409469 - <rustc_errors[595a87896474165e]::emitter::HumanEmitter as rustc_errors[595a87896474165e]::emitter::Emitter>::emit_diagnostic
  16:     0x75094740a8c1 - <rustc_errors[595a87896474165e]::DiagCtxtInner>::emit_diagnostic::{closure#3}
  17:     0x75094740de19 - rustc_interface[cacb1ddf69907e5b]::callbacks::track_diagnostic::<core[bb4a83b08ce1f593]::option::Option<rustc_span[694568e5274b44f6]::ErrorGuaranteed>>
  18:     0x75094740c23e - <rustc_errors[595a87896474165e]::DiagCtxtInner>::emit_diagnostic
  19:     0x75094740c0dd - <rustc_errors[595a87896474165e]::DiagCtxtHandle>::emit_diagnostic
  20:     0x75094749968b - <rustc_span[694568e5274b44f6]::ErrorGuaranteed as rustc_errors[595a87896474165e]::diagnostic::EmissionGuarantee>::emit_producing_guarantee
  21:     0x75094498217f - rustc_builtin_macros[55e9f49dc2d92829]::asm::expand_preparsed_asm
  22:     0x750944982c62 - rustc_builtin_macros[55e9f49dc2d92829]::asm::expand_asm
  23:     0x7509426bd08e - <rustc_expand[7ac319ded11d3fcf]::expand::MacroExpander>::fully_expand_fragment
  24:     0x75094738131f - <rustc_expand[7ac319ded11d3fcf]::expand::MacroExpander>::expand_crate
  25:     0x7509467480a7 - rustc_interface[cacb1ddf69907e5b]::passes::resolver_for_lowering_raw
  26:     0x75094674764d - rustc_query_impl[dda391671c843dbe]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[dda391671c843dbe]::query_impl::resolver_for_lowering_raw::dynamic_query::{closure#2}::{closure#0}, rustc_middle[550de35c81b7c220]::query::erase::Erased<[u8; 16usize]>>
  27:     0x750946747635 - <rustc_query_impl[dda391671c843dbe]::query_impl::resolver_for_lowering_raw::dynamic_query::{closure#2} as core[bb4a83b08ce1f593]::ops::function::FnOnce<(rustc_middle[550de35c81b7c220]::ty::context::TyCtxt, ())>>::call_once
  28:     0x750947169f52 - rustc_query_system[547d19ae72793cb3]::query::plumbing::try_execute_query::<rustc_query_impl[dda391671c843dbe]::DynamicConfig<rustc_query_system[547d19ae72793cb3]::query::caches::SingleCache<rustc_middle[550de35c81b7c220]::query::erase::Erased<[u8; 16usize]>>, false, false, false>, rustc_query_impl[dda391671c843dbe]::plumbing::QueryCtxt, false>
  29:     0x750947169bed - rustc_query_impl[dda391671c843dbe]::query_impl::resolver_for_lowering_raw::get_query_non_incr::__rust_end_short_backtrace
  30:     0x750946ff94de - rustc_interface[cacb1ddf69907e5b]::interface::run_compiler::<core[bb4a83b08ce1f593]::result::Result<(), rustc_span[694568e5274b44f6]::ErrorGuaranteed>, rustc_driver_impl[2d5acae0b271c880]::run_compiler::{closure#0}>::{closure#1}
  31:     0x75094705d8d0 - std[5c43df6f1c3208ff]::sys::backtrace::__rust_begin_short_backtrace::<rustc_interface[cacb1ddf69907e5b]::util::run_in_thread_with_globals<rustc_interface[cacb1ddf69907e5b]::util::run_in_thread_pool_with_globals<rustc_interface[cacb1ddf69907e5b]::interface::run_compiler<core[bb4a83b08ce1f593]::result::Result<(), rustc_span[694568e5274b44f6]::ErrorGuaranteed>, rustc_driver_impl[2d5acae0b271c880]::run_compiler::{closure#0}>::{closure#1}, core[bb4a83b08ce1f593]::result::Result<(), rustc_span[694568e5274b44f6]::ErrorGuaranteed>>::{closure#0}, core[bb4a83b08ce1f593]::result::Result<(), rustc_span[694568e5274b44f6]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[bb4a83b08ce1f593]::result::Result<(), rustc_span[694568e5274b44f6]::ErrorGuaranteed>>
  32:     0x75094705df3a - <<std[5c43df6f1c3208ff]::thread::Builder>::spawn_unchecked_<rustc_interface[cacb1ddf69907e5b]::util::run_in_thread_with_globals<rustc_interface[cacb1ddf69907e5b]::util::run_in_thread_pool_with_globals<rustc_interface[cacb1ddf69907e5b]::interface::run_compiler<core[bb4a83b08ce1f593]::result::Result<(), rustc_span[694568e5274b44f6]::ErrorGuaranteed>, rustc_driver_impl[2d5acae0b271c880]::run_compiler::{closure#0}>::{closure#1}, core[bb4a83b08ce1f593]::result::Result<(), rustc_span[694568e5274b44f6]::ErrorGuaranteed>>::{closure#0}, core[bb4a83b08ce1f593]::result::Result<(), rustc_span[694568e5274b44f6]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[bb4a83b08ce1f593]::result::Result<(), rustc_span[694568e5274b44f6]::ErrorGuaranteed>>::{closure#1} as core[bb4a83b08ce1f593]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  33:     0x75094705e2ab - std::sys::pal::unix::thread::Thread::new::thread_start::h8ebe34582a25d2ab
  34:     0x75094878439d - <unknown>
  35:     0x75094880949c - <unknown>
  36:                0x0 - <unknown>

error: the compiler unexpectedly panicked. this is a bug.

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 1.82.0-nightly (edbc000fa 2024-08-24) running on x86_64-unknown-linux-gnu

query stack during panic:
#0 [resolver_for_lowering_raw] getting the resolver for lowering
end of query stack
error: aborting due to 1 previous error

[jieyouxu]

cc #128790

[jieyouxu]

(without looking at the code, is it - BytePos(1)?)
EDIT: ah no this might be the other class of macro-related unicode troubles, seems similar to #114865