Closed
Description
openedon May 20, 2020
Discovered when playing with new asm! macro #69171
How to reproduce
cargo run
with following code:
fn main() {
unsafe {
asm!("nop")
}
}
- change asm! usage to
asm!("nop",out("invalid_reg")_)
building will result in error, because this is invalid register name ( this is 100% correct)
- change back to
asm!("nop")
(same code as in 1)
build will result with ICE:
thread 'rustc' panicked at 'missing specialization: `<rustc_middle::ty::query::on_disk_cache::CacheDecoder as SpecializedDecoder<&[rustc_ast::ast::InlineAsmTemplatePiece]>>::specialized_decode` not overridden', /rustc/3a7dfda40a3e798bf086bd58cc7e5e09deb808b5/src/libstd/macros.rs:16:9
stack backtrace:
0: backtrace::backtrace::libunwind::trace
at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.46/src/backtrace/libunwind.rs:86
1: backtrace::backtrace::trace_unsynchronized
at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.46/src/backtrace/mod.rs:66
2: std::sys_common::backtrace::_print_fmt
at src/libstd/sys_common/backtrace.rs:78
3: <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt
at src/libstd/sys_common/backtrace.rs:59
4: core::fmt::write
at src/libcore/fmt/mod.rs:1069
5: std::io::Write::write_fmt
at src/libstd/io/mod.rs:1537
6: std::sys_common::backtrace::_print
at src/libstd/sys_common/backtrace.rs:62
7: std::sys_common::backtrace::print
at src/libstd/sys_common/backtrace.rs:49
8: std::panicking::default_hook::{{closure}}
at src/libstd/panicking.rs:198
9: std::panicking::default_hook
at src/libstd/panicking.rs:218
10: rustc_driver::report_ice
11: std::panicking::rust_panic_with_hook
at src/libstd/panicking.rs:490
12: rust_begin_unwind
at src/libstd/panicking.rs:388
13: std::panicking::begin_panic_fmt
at src/libstd/panicking.rs:342
14: <E as serialize::serialize::SpecializationError>::not_found
15: <rustc_middle::mir::Terminator as serialize::serialize::Decodable>::decode
16: serialize::serialize::Decoder::read_option
17: <rustc_middle::mir::BasicBlockData as serialize::serialize::Decodable>::decode
18: serialize::serialize::Decoder::read_seq
19: <rustc_middle::mir::Body as serialize::serialize::Decodable>::decode
20: rustc_middle::ty::query::on_disk_cache::OnDiskCache::try_load_query_result
21: rustc_middle::query::<impl rustc_query_system::query::config::QueryDescription<rustc_middle::ty::context::TyCtxt> for rustc_middle::ty::query::queries::optimized_mir>::try_load_from_disk
22: rustc_query_system::query::plumbing::load_from_disk_and_cache_in_memory
23: rustc_data_structures::stack::ensure_sufficient_stack
24: rustc_query_system::query::plumbing::get_query_impl
25: rustc_middle::ty::<impl rustc_middle::ty::context::TyCtxt>::instance_mir
26: rustc_mir::monomorphize::collector::collect_neighbours
27: rustc_data_structures::stack::ensure_sufficient_stack
28: rustc_mir::monomorphize::collector::collect_items_rec
29: rustc_session::utils::<impl rustc_session::session::Session>::time
30: rustc_mir::monomorphize::collector::collect_crate_mono_items
31: rustc_mir::monomorphize::partitioning::collect_and_partition_mono_items
32: rustc_middle::ty::query::<impl rustc_query_system::query::config::QueryAccessors<rustc_middle::ty::context::TyCtxt> for rustc_middle::ty::query::queries::collect_and_partition_mono_items>::compute
33: rustc_middle::dep_graph::<impl rustc_query_system::dep_graph::DepKind for rustc_middle::dep_graph::dep_node::DepKind>::with_deps
34: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl
35: rustc_data_structures::stack::ensure_sufficient_stack
36: rustc_query_system::query::plumbing::get_query_impl
37: rustc_codegen_ssa::base::codegen_crate
38: <rustc_codegen_llvm::LlvmCodegenBackend as rustc_codegen_ssa::traits::backend::CodegenBackend>::codegen_crate
39: rustc_session::utils::<impl rustc_session::session::Session>::time
40: rustc_interface::passes::start_codegen
41: rustc_middle::ty::context::tls::enter_global
42: rustc_interface::queries::Queries::ongoing_codegen
43: rustc_interface::interface::run_compiler_in_existing_thread_pool
44: scoped_tls::ScopedKey<T>::set
45: rustc_ast::attr::with_globals
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.
error: internal compiler error: unexpected panic
note: the compiler unexpectedly panicked. this is a bug.
note: we would appreciate a bug report: https://github.com/rust-lang/rust/blob/master/CONTRIBUTING.md#bug-reports
note: rustc 1.45.0-nightly (3a7dfda40 2020-05-19) running on x86_64-unknown-linux-gnu
note: compiler flags: -C embed-bitcode=no -C debuginfo=2 -C incremental --crate-type bin
note: some of the compiler flags provided by cargo are hidden
query stack during panic:
#0 [optimized_mir] processing `main`
#1 [collect_and_partition_mono_items] collect_and_partition_mono_items
end of query stack
error: could not compile `test_asm`.
Workarounds
- disable incremental compilation
cargo clean
Meta
rustc --version --verbose
:
rustc 1.45.0-nightly (3a7dfda40 2020-05-19)
binary: rustc
commit-hash: 3a7dfda40a3e798bf086bd58cc7e5e09deb808b5
commit-date: 2020-05-19
host: x86_64-unknown-linux-gnu
release: 1.45.0-nightly
LLVM version: 9.0
also fails on x86_64-pc-windows-gnu
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Area: Incremental compilationArea: Inline assembly (`asm!(…)`)Area: Trait impl specializationCategory: This is a bug.`#![feature(asm)]` (not `llvm_asm`)Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️Relevant to the compiler team, which will review and decide on the PR/issue.