llvm

IKOS LLVM Frontend

This folder contains implementation of the LLVM frontend for IKOS.

Introduction

The LLVM frontend implements:

• ikos-pp, a LLVM bitcode pre-processor for static analysis
• llvm-to-ar, a library to translate LLVM bitcode to Abstract Representation (AR)
• ikos-import, a translator from LLVM bitcode to AR, used for debugging purpose.

Installation

IKOS LLVM Frontend contains a C++ library and executables. It can be installed independently from the other components.

Dependencies

To build IKOS LLVM Frontend, you will need the following dependencies:

• A C++ compiler that supports C++14 (gcc >= 4.9.2 or clang >= 3.4)
• CMake >= 3.4.3
• GMP >= 4.3.1
• Boost >= 1.55
• LLVM 14.0.x
• IKOS Core
• IKOS AR

Build and Install

To build and install IKOS LLVM Frontend, run the following commands in the frontend/llvm directory:

$ mkdir build
$ cd build
$ cmake \
    -DCMAKE_INSTALL_PREFIX=/path/to/frontend-llvm-install-directory \
    -DLLVM_CONFIG_EXECUTABLE=/path/to/llvm/bin/llvm-config \
    -DCORE_ROOT=/path/to/core-install-directory \
    -DAR_ROOT=/path/to/ar-install-directory \
    ..
$ make
$ make install

Tests

To build and run the tests, simply type:

$ make check

Running the LLVM Frontend Tools

lib/libikos-llvm-to-ar.a

llvm-to-ar is a library to translate LLVM bitcode to AR, used by the analyzer and ikos-import.

ikos-pp

ikos-pp is a LLVM bitcode pre-processor for static analysis.

It is similar to the LLVM opt command, see https://llvm.org/docs/CommandGuide/opt.html

See ikos-pp -help for more information.

ikos-import

ikos-import is a translator from LLVM bitcode to AR, used for debugging purpose.

See ikos-import -help for more information.

Overview of the source code

The following illustrates the directory structure of this folder:

.
├── include
│   └── ikos
│       └── frontend
│           └── llvm
│               └── import
├── src
│   ├── import
│   └── pass
└── test
    └── regression
        ├── import
        │   ├── aggressive_optimization
        │   ├── basic_optimization
        │   └── no_optimization
        └── pass
            ├── lower_cst_expr
            ├── lower_select
            ├── remove_printf_calls
            └── remove_unreachable_blocks

include/

• include/ikos/frontend/llvm/import contains definition of the translation from LLVM to AR.

• include/ikos/frontend/llvm/pass.hpp contains definition of LLVM passes for helping static analysis.

src/

• src/ikos_import.cpp contains implementation of ikos-import.

• src/ikos_pp.cpp contains implementation of ikos-pp.

• src/import contains implementation of the translation from LLVM to AR.

• src/pass contains implementation of LLVM passes for helping static analysis.

test/

Contains regression tests.