5f056fcb3d
gdb 13.1 crashes while running the rust compiler's debugger tests. The crash has a number of causes. First, the rust compiler still uses the C++-like _Z mangling, but with its own twist -- some hex digits added to the end of a symbol. So, while gdb finds the correct name of "main": (top-gdb) p name $13 = 0x292e0c0 "rustc_gdb_1031745::main" It isn't found in the minsyms, because C++ demangling yields: [99] t 0x90c0 _ZN17rustc_gdb_10317454main17h5b5be7fe16a97225E section .text rustc_gdb_1031745::main::h5b5be7fe16a97225 zko06yobckx336v This could perhaps be fixed. I also filed a new PR to suggest preferring the linkage name of the main program. Next, the rust compiler emits both a DW_TAG_subprogram and a DW_TAG_namespace for "main". This happens because the file is named "main.rs" -- i.e., the bug is specific to the source file name. The crash also seems to require the nested function inside of 'main', at least for me. The namespace always is generated, but perhaps this changes the ordering in the DWARF. When inside_main_func looks up the main symbol, it finds the namespace symbol rather than the function. (I filed a bug about fixing gdb's symbol tables -- long overdue.) Meanwhile, as I think it's important to fix this crash sooner rather than later, this patch changes inside_main_func to check that the symbol that is found is LOC_BLOCK. This perhaps should have been done in the first place, anyway. Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=30158
30 lines
898 B
Rust
30 lines
898 B
Rust
// Copyright (C) 2016-2023 Free Software Foundation, Inc.
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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#![allow(dead_code)]
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#![allow(unused_variables)]
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#![allow(unused_assignments)]
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fn global_fn(x: u8) {
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// BREAK
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}
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fn main() {
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fn nested(y: u8) {
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global_fn(y)
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}
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nested(23);
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}
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