This archive contains Frama-Clang, a Frama-C plug-in for parsing C++ files, based on Clang, the C/C++/Objective-C front-end of the LLVM compiler infrastructure.

Installation

The following packages must be present on the system in order to compile Frama-Clang

• llvm and clang (version >= 6.x, preferably 9 or 10)
  • For Ubuntu and Debian, install the following packages: libclang--dev clang- (with their dependencies).
  • For Fedora, install the following packages: llvm-static clang clang-devel (packages such as llvm, llvm-devel and ncurses-devel should be included in their dependencies; otherwise, you might need to install them as well)
• Frama-C version 21.x Scandium
• OCaml version 4.05 or higher (i.e. the same version than the one that was used to compile Frama-C).
• The corresponding camlp5 version

The front-end can then be compiled with the traditional commands

./configure
make
make install

Depending on the exact configuration of the system, the last step might require administrator rights. See ./configure --help for possible customization of the configuration stage.

Usage

Once installed, Frama-Clang will be automatically called by Frama-C's kernel whenever a C++ source file is encountered. More precisely, files ending with .cpp, .C, .cxx, .c++ or .cc will be treated as C++ files. Files ending with .ii will be considered as already pre-processed C++ files.

Options of the plug-in are the following.

• -cxx-demangling-full tells Frama-C to display C++ global identifiers with their fully-qualified name (e.g. ::A::x)
• -cxx-demangling-short tells Frama-C to display global C++ identifiers with their unqualified name (e.g. x)
• -cxx-keep-mangling tells Frama-C to display global C++ identifiers with the name they have in the C translation (e.g. _Z1A1x, that allows to distinguish between overloaded symbols. This mangled name is computed from the fully-qualified C++ name according to the rules described in the Itanium C++ ABI. Pretty-printing the AST with this option should result in compilable C code.
• -cxx-cstdlib-path <path> specifies where to look for standard C library headers (default is the path to Frama-C's headers)
• -cxx-c++stdlib-path <path> specifies where to look for standard C++ library headers (default is the path to Frama-Clang headers, which are very incomplete)
• -cxx-nostdinc do not include in the search paths Frama-C's C/C++ standard headers location (i.e. rely on the system's headers)
• -cxx-clang-command <cmd> allows changing the name of the command that launches clang and its plugin that outputs the intermediate AST. This should only be needed if the front-end as a whole has not been installed properly.

In addition, any command-line option taking a function name as argument (e.g. -main, -eva-slevel-function, ...) will accept a fully qualified C++ name (provided it refers to an existing function in the code under analysis of course). Note however that it is currently not possible to distinguish between overloaded functions using this mechanism.