The LLDB Debugger (LLDB) is a software debugger. It is built as a set of reusable components which extensively use existing libraries from the larger LLVM Project, such as the Clang expression parser and LLVM disassembler.
All of the code in the LLDB project is free and open-source software subject to the terms of the University of Illinois/NCSA Open Source License, a non-copyleft license, as is the case with other parts of the LLVM project.
Although LLDB is in early development, it is mature enough to support basic debugging of programs written in C, Objective-C and C++.
LLDB is known to work on OS X, Linux and FreeBSD and supports i386, x86-64 and ARM instruction sets. It is used as a default debugger for Xcode 4.3 and later versions.