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[DebugInfo] Fix duplicate DIFile when main file is preprocessed #75022

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Merged
merged 1 commit into from
Dec 12, 2023
Merged

[DebugInfo] Fix duplicate DIFile when main file is preprocessed #75022

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10 changes: 6 additions & 4 deletions clang/lib/CodeGen/CGDebugInfo.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -554,14 +554,16 @@ void CGDebugInfo::CreateCompileUnit() {
// If the main file name provided is identical to the input file name, and
// if the input file is a preprocessed source, use the module name for
// debug info. The module name comes from the name specified in the first
// linemarker if the input is a preprocessed source.
// linemarker if the input is a preprocessed source. In this case we don't
// know the content to compute a checksum.
if (MainFile->getName() == MainFileName &&
FrontendOptions::getInputKindForExtension(
MainFile->getName().rsplit('.').second)
.isPreprocessed())
.isPreprocessed()) {
MainFileName = CGM.getModule().getName().str();

CSKind = computeChecksum(SM.getMainFileID(), Checksum);
} else {
CSKind = computeChecksum(SM.getMainFileID(), Checksum);
}
}

llvm::dwarf::SourceLanguage LangTag;
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4 changes: 4 additions & 0 deletions clang/test/CodeGen/debug-info-preprocessed-file.i
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Expand Up @@ -6,6 +6,10 @@
# 1 "<built-in>" 2
# 1 "preprocessed-input.c" 2

/// The main file is preprocessed. We change it to preprocessed-input.c. Since
/// the content is not available, we don't compute a checksum.
// RUN: %clang -g -c -S -emit-llvm -o - %s | FileCheck %s
// CHECK: !DICompileUnit(language: DW_LANG_C{{.*}}, file: ![[FILE:[0-9]+]]
// CHECK: ![[FILE]] = !DIFile(filename: "/foo/bar/preprocessed-input.c"
// CHECK-NOT: checksumkind:
// CHECK-NOT: !DIFile(