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Special case DUMMY_SP to emit line 0/column 0 locations on DWARF platforms.

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Line 0 has a special meaning in DWARF. From the version 5 spec:

    The compiler may emit the value 0 in cases
    where an instruction cannot be attributed to any
    source line.

DUMMY_SP spans cannot be attributed to any line. However, because rustc
internally stores line numbers starting at zero, lookup_debug_loc() adjusts
every line number by one. Special casing DUMMY_SP to actually emit line 0
ensures rustc communicates to the debugger that there's no meaningful source
code for this instruction, rather than telling the debugger to jump to line 1
randomly.
This commit is contained in:
Kyle Huey 2024-08-03 21:04:19 -07:00
parent a6043039ad
commit 78caecf8f3
1 changed files with 7 additions and 2 deletions
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9
compiler/rustc_codegen_llvm/src/debuginfo/mod.rs
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@ -20,7 +20,7 @@ use rustc_session::config::{self, DebugInfo};
use rustc_session::Session;
use rustc_span::symbol::Symbol;
use rustc_span::{
BytePos, Pos, SourceFile, SourceFileAndLine, SourceFileHash, Span, StableSourceFileId,
BytePos, Pos, SourceFile, SourceFileAndLine, SourceFileHash, Span, StableSourceFileId, DUMMY_SP,
};
use rustc_target::abi::Size;
use smallvec::SmallVec;
@ -570,7 +570,12 @@ impl<'ll, 'tcx> DebugInfoMethods<'tcx> for CodegenCx<'ll, 'tcx> {
inlined_at: Option<&'ll DILocation>,
span: Span,
) -> &'ll DILocation {
let DebugLoc { line, col, .. } = self.lookup_debug_loc(span.lo());
let (line, col) = if span == DUMMY_SP && !self.sess().target.is_like_msvc {
(0, 0)
} else {
let DebugLoc { line, col, .. } = self.lookup_debug_loc(span.lo());
(line, col)
};
unsafe { llvm::LLVMRustDIBuilderCreateDebugLocation(line, col, scope, inlined_at) }
}