Project: libcst

Language python
OSS-Fuzz project link
Project repository link
Build status: Fuzzers succeeding: Build log
Build status: Code coverage succeeding: Build log
Build status: Fuzz Introspector succeeding: Build log
Fuzzer count 1
Lines of code 16502
Lines covered 10322
Code coverage 62.55%
Code coverage report Report link
Static reachability 0.64%
Fuzz Introspector report Report link (from 2025-11-16)

Historical Progression

Functions of interest to fuzz

This section outlines functions that may be of interest to fuzz. They are based on ranking functions that have a lot of complexity but currently exhibit low code coverage. The complexity is calculated based on the function itself as well as the functions called by the given function, i.e. the tree of code that the function triggers.


This is only a minor amount of introspection information available for this project. Please consult the Fuzz Introspector report for more information, e.g. the introspection table of all functions in the target project available here.

Function name Function source file Accumulated cyclomatic complexity Code coverage
libcst.codemod.commands.rename.RenameCommand.leave_Attribute libcst.codemod.commands.rename 4356 0.0%
libcst.codemod.commands.rename.leave_import_decorator.wrapper libcst.codemod.commands.rename 4343 0.0%
libcst.codemod.commands.rename.RenameCommand.leave_Name libcst.codemod.commands.rename 4343 0.0%
libcst.codemod.commands.rename.RenameCommand.leave_ImportFrom libcst.codemod.commands.rename 4332 0.0%
libcst.codemod.commands.rename.RenameCommand.gen_replacement libcst.codemod.commands.rename 4298 0.0%
libcst.codemod.visitors._apply_type_annotations.ImportedSymbolCollector.visit_ClassDef libcst.codemod.visitors._apply_type_annotations 3173 0.0%
libcst.codemod.visitors._apply_type_annotations.ImportedSymbolCollector.visit_Name libcst.codemod.visitors._apply_type_annotations 3173 0.0%
libcst.codemod.visitors._apply_type_annotations.ImportedSymbolCollector.visit_Attribute libcst.codemod.visitors._apply_type_annotations 3173 0.0%
libcst.codemod.visitors._apply_type_annotations._module_and_target libcst.codemod.visitors._apply_type_annotations 3126 0.0%
libcst.codegen.gen_matcher_classes._get_fields libcst.codegen.gen_matcher_classes 1989 0.0%