Description of the project:
+ Clang supports source-based coverage that shows which lines of code are covered by the executed tests[1]. It uses llvm-profdata [2] and llvm-cov [3] tools to generate coverage reports. llvm-cov currently generates a single top-level index HTML file. For example, a single top-level directory code coverage report [4] for LLVM repo is published on a coverage bot. Top-level indexing causes rendering scalability issues in large projects, such as Fuchsia [5]. The goal of this project is to generate a hierarchical directory structure in generated coverage html reports to match the directory structure and solve scalability issues. Chromium uses its own post-processing tools to show a per-directory hierarchical structure for coverage results [6]. Similarly, Lcov, which is a graphical front-end Gcov[7], provides a one-level directory structure to display coverage results [8].
Resources:
+ [1] Source-based code coverage
+ [2] llvm-profdata
+ [3] llvm-cov
+ [4] LLVM coverage reports
+ [5] Fuchsia
+ [6] Coverage summary for Chromium
+ [7] Gcov
+ [8] Lcov coverage reports
+ [9] Issue #54711: Support per-directory index files for HTML coverage report
Expected result: Implement a support in hierarchical directory structure in generated coverage html reports and show the usage of this feature in LLVM repo code coverage reports.
+Project size: Medium or Large
+Difficulty: Medium
+Confirmed Mentors: + Gulfem Savrun Yeniceri + Peter Hosek +
+Discourse: URL +