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fix(trim-paths): trim SO and DW_AT_comp_dir symbols for root DI node #118518

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fix(trim-paths): trim SO and DW_AT_comp_dir symbols for root DI node #118518

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33d65e6
test: verify current remap rules on darwin
weihanglo Jan 23, 2024
a55de2b
test: verify current remap rules on Linux
weihanglo Jan 23, 2024
c2b1547
fix(trim-paths): trim working diretory from root DI node
weihanglo Jan 24, 2024
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17 changes: 15 additions & 2 deletions compiler/rustc_codegen_llvm/src/debuginfo/metadata.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -852,9 +852,22 @@ pub fn build_compile_unit_di_node<'ll, 'tcx>(
// FIXME(#41252) Remove "clang LLVM" if we can get GDB and LLVM to play nice.
let producer = format!("clang LLVM ({rustc_producer})");

use rustc_session::RemapFileNameExt;
let name_in_debuginfo = name_in_debuginfo.to_string_lossy();
let work_dir = tcx.sess.opts.working_dir.for_codegen(tcx.sess).to_string_lossy();
debug!(?name_in_debuginfo, "build_compile_unit_di_node");

// Path of working directory in the root DI node seems to be embedded in
// executables. Hence, we trim them when the scope of `unsplit-debuginfo`
// is present, as if it is kinda a "unsplit" debuginfo.
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I've been able to verify that this is indeed the case for DWARF dwps (i.e. the DW_AT_comp_dir is only contained in the binary, not in the dwp). However, I'm not sure that this behavior is guaranteed, so I think we should test that the dwp and dwo files don't contain the compiler's working directory at all.

use rustc_session::config::RemapPathScopeComponents;
use rustc_session::RemapFileNameExt;
let work_dir = tcx
.sess
.opts
.working_dir
.for_scope(tcx.sess, RemapPathScopeComponents::UNSPLIT_DEBUGINFO)
.to_string_lossy();
debug!(?work_dir, "build_compile_unit_di_node");

let output_filenames = tcx.output_filenames(());
let split_name = if tcx.sess.target_can_use_split_dwarf() {
output_filenames
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