Skip to content

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

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Open
wants to merge 4 commits into
base: main
Choose a base branch
from
Open

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

Show file tree
Hide file tree
Changes from 3 commits
Commits
Show all changes
4 commits
Select commit Hold shift + click to select a range
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
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
8 changes: 6 additions & 2 deletions llvm/lib/DebugInfo/DWARF/DWARFAcceleratorTable.cpp
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -1117,7 +1117,8 @@ std::optional<StringRef> llvm::StripTemplateParameters(StringRef Name) {
//
// We look for > at the end but if it does not contain any < then we
// have something like operator>>. We check for the operator<=> case.
if (!Name.ends_with(">") || Name.count("<") == 0 || Name.ends_with("<=>"))
if (Name.starts_with("<") || !Name.ends_with(">") || Name.count("<") == 0 ||
Copy link
Member

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

We don't need this Name.starts_with("<") check anymore right?

Copy link
Collaborator Author

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

correct. I can remove it.

Name.ends_with("<=>"))
return {};

// How many < until we have the start of the template parameters.
Expand All @@ -1138,5 +1139,8 @@ 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
View file
Open in desktop
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
Loading