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Fix llvm::StripTemplateParameters to not return an empty name. #157553

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Fix llvm::StripTemplateParameters to not return an empty name. #157553

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b31cccc
Fix llvm::StripTemplateParameters to not return an empty name.
clayborg Sep 8, 2025
6d612bd
Remove extra clang format changes and fix comment.
clayborg Sep 9, 2025
be50148
Make sure that if the string is empty that we return std::nullopt
clayborg Sep 11, 2025
8442dfb
Remove check for name starting with '<'.
clayborg Sep 12, 2025
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5 changes: 4 additions & 1 deletion llvm/lib/DebugInfo/DWARF/DWARFAcceleratorTable.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -1138,5 +1138,8 @@ std::optional<StringRef> llvm::StripTemplateParameters(StringRef Name) {
while (NumLeftAnglesToSkip--)
StartOfTemplate = Name.find('<', StartOfTemplate) + 1;

return Name.substr(0, StartOfTemplate - 1);
StringRef Result = Name.substr(0, StartOfTemplate - 1);
if (Result.empty())
return std::nullopt;
return Result;
}
14 changes: 14 additions & 0 deletions llvm/unittests/DebugInfo/DWARF/DWARFAcceleratorTableTest.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -299,4 +299,18 @@ TEST(DWARFDebugNames, UnsupportedForm) {
Sections,
FailedWithMessage("unsupported Form for YAML debug_names emitter"));
}

TEST(DWARFDebugNames, TestStripTemplateParameters) {

std::optional<StringRef> stripped_name;
// Make sure we can extract the name "foo" from the template parameters.
stripped_name = StripTemplateParameters("foo<int>");
ASSERT_TRUE(stripped_name.has_value());
ASSERT_EQ(*stripped_name, StringRef("foo"));
// Make sure that we don't get a valid name back when the string starts with
// '<'.
stripped_name = StripTemplateParameters("<int>");
ASSERT_FALSE(stripped_name.has_value());
}

} // end anonymous namespace
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