ICE: codegen: `index out of bounds: the len is 3 but the index is 4`

[matthiaskrgr]

auto-reduced (treereduce-rust):

#![crate_type = "lib"]
#![feature(naked_functions)]
use std::arch::asm;

#[naked]
pub unsafe extern "C" fn naked_with_args_and_return(a: isize, b: isize) -> isize {
    asm!("lea rax, [rdi + rsi]", "ret", options(noreturn));
}

original:

// compile-flags: -C no-prepopulate-passes
// needs-asm-support
// only-x86_64

#![crate_type = "lib"]
#![feature(naked_functions)]
use std::arch::asm;

// CHECK: Function Attrs: naked
// CHECK-NEXT: define{{.*}}void @naked_empty()
#[no_mangle]
#[naked]
pub unsafe extern "C" fn asm() {
    // CHECK-NEXT: {{.+}}:
    // CHECK-NEXT: call void asm
    // CHECK-NEXT: unreachable
    asm!("ret",
         options(noreturn));
}

// CHECK: Function Attrs: naked
// CHECK-NEXT: define{{.*}}i{{[0-9]+}} @naked_with_args_and_return(i64 %a, i64 %b)
#[no_mangle]
#[naked]
pub unsafe extern "C" fn naked_with_args_and_return(a: isize, b: isize) -> isize {
    // CHECK-NEXT: {{.+}}:
    // CHECK-NEXT: call void asm
    // CHECK-NEXT: unreachable
    asm!("lea rax, [rdi + rsi]",
         "ret",
         options(noreturn));
}

Version information

rustc 1.79.0-nightly (cb3752d20 2024-04-25)
binary: rustc
commit-hash: cb3752d20e0f5d24348062211102a08d46fbecff
commit-date: 2024-04-25
host: x86_64-unknown-linux-gnu
release: 1.79.0-nightly
LLVM version: 18.1.4

Command:
/home/matthias/.rustup/toolchains/master/bin/rustc -Zmir-opt-level=0

Program output

warning: unused attribute
 --> /tmp/icemaker_global_tempdir.eKkYCL3DP8Cd/rustc_testrunner_tmpdir_reporting.YGEGx2f1RK8i/mvce.rs:6:1
  |
6 | #[naked]
  | ^^^^^^^^ help: remove this attribute
  |
note: attribute also specified here
 --> /tmp/icemaker_global_tempdir.eKkYCL3DP8Cd/rustc_testrunner_tmpdir_reporting.YGEGx2f1RK8i/mvce.rs:5:1
  |
5 | #[naked]
  | ^^^^^^^^
  = note: `#[warn(unused_attributes)]` on by default

WARN rustc_codegen_ssa::mir::locals Unexpected initial operand type: expected isize, found !.See <https://github.com/rust-lang/rust/issues/114858>.
WARN rustc_codegen_ssa::mir::locals Unexpected initial operand type: expected isize, found !.See <https://github.com/rust-lang/rust/issues/114858>.
thread 'rustc' panicked at /rustc/cb3752d20e0f5d24348062211102a08d46fbecff/compiler/rustc_codegen_ssa/src/mir/statement.rs:54:63:
index out of bounds: the len is 3 but the index is 4
stack backtrace:
   0:     0x7b37f3f16145 - std::backtrace_rs::backtrace::libunwind::trace::h5605728a39057d84
                               at /rustc/cb3752d20e0f5d24348062211102a08d46fbecff/library/std/src/../../backtrace/src/backtrace/libunwind.rs:105:5
   1:     0x7b37f3f16145 - std::backtrace_rs::backtrace::trace_unsynchronized::h26b02d645a74e0ae
                               at /rustc/cb3752d20e0f5d24348062211102a08d46fbecff/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7b37f3f16145 - std::sys_common::backtrace::_print_fmt::h068d097fdd201426
                               at /rustc/cb3752d20e0f5d24348062211102a08d46fbecff/library/std/src/sys_common/backtrace.rs:68:5
   3:     0x7b37f3f16145 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::hdbb63c7c16d10ece
                               at /rustc/cb3752d20e0f5d24348062211102a08d46fbecff/library/std/src/sys_common/backtrace.rs:44:22
   4:     0x7b37f3f6521b - core::fmt::rt::Argument::fmt::h67dd1b13c2f2f60d
                               at /rustc/cb3752d20e0f5d24348062211102a08d46fbecff/library/core/src/fmt/rt.rs:165:63
   5:     0x7b37f3f6521b - core::fmt::write::h7132c149ac34da54
                               at /rustc/cb3752d20e0f5d24348062211102a08d46fbecff/library/core/src/fmt/mod.rs:1157:21
   6:     0x7b37f3f0accf - std::io::Write::write_fmt::h323f8c8c2c83029d
                               at /rustc/cb3752d20e0f5d24348062211102a08d46fbecff/library/std/src/io/mod.rs:1832:15
   7:     0x7b37f3f15f1e - std::sys_common::backtrace::_print::hbbc04e79982f59bb
                               at /rustc/cb3752d20e0f5d24348062211102a08d46fbecff/library/std/src/sys_common/backtrace.rs:47:5
   8:     0x7b37f3f15f1e - std::sys_common::backtrace::print::h30e4ba3a749f53ca
                               at /rustc/cb3752d20e0f5d24348062211102a08d46fbecff/library/std/src/sys_common/backtrace.rs:34:9
   9:     0x7b37f3f18889 - std::panicking::default_hook::{{closure}}::h8a178c9d6b0b94e7
  10:     0x7b37f3f185cd - std::panicking::default_hook::hdd8156d952193739
                               at /rustc/cb3752d20e0f5d24348062211102a08d46fbecff/library/std/src/panicking.rs:298:9
  11:     0x7b37f084e3dc - std[8bf3ba7b94ed234c]::panicking::update_hook::<alloc[a86d15d3d60259f5]::boxed::Box<rustc_driver_impl[ff0ca504bb3c8cda]::install_ice_hook::{closure#0}>>::{closure#0}
  12:     0x7b37f3f18f86 - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::ha3edf74e61015c1d
                               at /rustc/cb3752d20e0f5d24348062211102a08d46fbecff/library/alloc/src/boxed.rs:2036:9
  13:     0x7b37f3f18f86 - std::panicking::rust_panic_with_hook::hb81630742c93e4ac
                               at /rustc/cb3752d20e0f5d24348062211102a08d46fbecff/library/std/src/panicking.rs:799:13
  14:     0x7b37f3f18d34 - std::panicking::begin_panic_handler::{{closure}}::hae457da9026d20e4
                               at /rustc/cb3752d20e0f5d24348062211102a08d46fbecff/library/std/src/panicking.rs:664:13
  15:     0x7b37f3f16609 - std::sys_common::backtrace::__rust_end_short_backtrace::h21495a629a302214
                               at /rustc/cb3752d20e0f5d24348062211102a08d46fbecff/library/std/src/sys_common/backtrace.rs:171:18
  16:     0x7b37f3f18a67 - rust_begin_unwind
                               at /rustc/cb3752d20e0f5d24348062211102a08d46fbecff/library/std/src/panicking.rs:652:5
  17:     0x7b37f3f616e3 - core::panicking::panic_fmt::h935fb4d00ba2a2fa
                               at /rustc/cb3752d20e0f5d24348062211102a08d46fbecff/library/core/src/panicking.rs:72:14
  18:     0x7b37f3f61907 - core::panicking::panic_bounds_check::h52ccb5f2347221e6
                               at /rustc/cb3752d20e0f5d24348062211102a08d46fbecff/library/core/src/panicking.rs:275:5
  19:     0x7b37f288f5b5 - rustc_codegen_ssa[1b654a979dd64848]::mir::codegen_mir::<rustc_codegen_llvm[6449e36ab917380]::builder::Builder>
  20:     0x7b37f28759d0 - rustc_codegen_llvm[6449e36ab917380]::base::compile_codegen_unit::module_codegen
  21:     0x7b37f2871c96 - <rustc_codegen_llvm[6449e36ab917380]::LlvmCodegenBackend as rustc_codegen_ssa[1b654a979dd64848]::traits::backend::ExtraBackendMethods>::compile_codegen_unit
  22:     0x7b37f29fd9a9 - rustc_codegen_ssa[1b654a979dd64848]::base::codegen_crate::<rustc_codegen_llvm[6449e36ab917380]::LlvmCodegenBackend>
  23:     0x7b37f2ab3a0c - <rustc_codegen_llvm[6449e36ab917380]::LlvmCodegenBackend as rustc_codegen_ssa[1b654a979dd64848]::traits::backend::CodegenBackend>::codegen_crate
  24:     0x7b37f2ab339f - rustc_interface[79bb94ccf3e33350]::passes::start_codegen
  25:     0x7b37f2ab2a1a - <rustc_interface[79bb94ccf3e33350]::queries::Queries>::codegen_and_build_linker
  26:     0x7b37f27dd736 - rustc_interface[79bb94ccf3e33350]::interface::run_compiler::<core[69fef399d12a0664]::result::Result<(), rustc_span[fd9590449ede6f6]::ErrorGuaranteed>, rustc_driver_impl[ff0ca504bb3c8cda]::run_compiler::{closure#0}>::{closure#1}
  27:     0x7b37f27c7727 - std[8bf3ba7b94ed234c]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[79bb94ccf3e33350]::util::run_in_thread_with_globals<rustc_interface[79bb94ccf3e33350]::util::run_in_thread_pool_with_globals<rustc_interface[79bb94ccf3e33350]::interface::run_compiler<core[69fef399d12a0664]::result::Result<(), rustc_span[fd9590449ede6f6]::ErrorGuaranteed>, rustc_driver_impl[ff0ca504bb3c8cda]::run_compiler::{closure#0}>::{closure#1}, core[69fef399d12a0664]::result::Result<(), rustc_span[fd9590449ede6f6]::ErrorGuaranteed>>::{closure#0}, core[69fef399d12a0664]::result::Result<(), rustc_span[fd9590449ede6f6]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[69fef399d12a0664]::result::Result<(), rustc_span[fd9590449ede6f6]::ErrorGuaranteed>>
  28:     0x7b37f27c74ea - <<std[8bf3ba7b94ed234c]::thread::Builder>::spawn_unchecked_<rustc_interface[79bb94ccf3e33350]::util::run_in_thread_with_globals<rustc_interface[79bb94ccf3e33350]::util::run_in_thread_pool_with_globals<rustc_interface[79bb94ccf3e33350]::interface::run_compiler<core[69fef399d12a0664]::result::Result<(), rustc_span[fd9590449ede6f6]::ErrorGuaranteed>, rustc_driver_impl[ff0ca504bb3c8cda]::run_compiler::{closure#0}>::{closure#1}, core[69fef399d12a0664]::result::Result<(), rustc_span[fd9590449ede6f6]::ErrorGuaranteed>>::{closure#0}, core[69fef399d12a0664]::result::Result<(), rustc_span[fd9590449ede6f6]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[69fef399d12a0664]::result::Result<(), rustc_span[fd9590449ede6f6]::ErrorGuaranteed>>::{closure#2} as core[69fef399d12a0664]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  29:     0x7b37f3f22e1b - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h5acff674129337c4
                               at /rustc/cb3752d20e0f5d24348062211102a08d46fbecff/library/alloc/src/boxed.rs:2022:9
  30:     0x7b37f3f22e1b - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h8aabd62c8ccb0918
                               at /rustc/cb3752d20e0f5d24348062211102a08d46fbecff/library/alloc/src/boxed.rs:2022:9
  31:     0x7b37f3f22e1b - std::sys::pal::unix::thread::Thread::new::thread_start::h65e97bc238441a51
                               at /rustc/cb3752d20e0f5d24348062211102a08d46fbecff/library/std/src/sys/pal/unix/thread.rs:108:17
  32:     0x7b37f3cc155a - <unknown>
  33:     0x7b37f3d3ea3c - <unknown>
  34:                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 1.79.0-nightly (cb3752d20 2024-04-25) running on x86_64-unknown-linux-gnu

note: compiler flags: -Z mir-opt-level=0 -Z dump-mir-dir=dir

query stack during panic:
end of query stack
warning: 1 warning emitted

@rustbot label +F-naked_functions