LLDB vs OllyDbg

LLDB is a free debugger built from reusable components that use LLVM libraries, including Clang's expression parser and the LLVM disassembler. It is the default debugger in Xcode on macOS and supports debugging C, C++, and Objective-C on desktop and iOS devices and simulators. Its tools include breakpoints, watchpoints, process launching, and attaching to programs; remote debugging is also documented for Linux, Windows, Android, and iOS. Expression evaluation uses Clang infrastructure for current C-family language features, multiline expressions, and just-in-time evaluation where supported. Developers can use its shared-library C++ API and Python bindings for scripting, symbolication, disassembly, and inspecting object and symbol files. The lldb-dap adapter connects LLDB functionality to compatible editors and IDEs, including Visual Studio Code, Emacs, vim, and neovim. LLDB is available under the Apache 2.0 License with LLVM exceptions. Windows support remains under active development, with ARM and AArch64 described as more experimental. The lldb-dap interface documents no support for step-back, setting a variable, goto-target, or terminate requests.

OllyDbg is a free 32-bit assembler-level debugger for Microsoft Windows, intended for binary analysis when source code is unavailable. It traces registers and identifies procedures, loops, API calls, switches, tables, constants, and strings. The debugger can load DLLs, attach to running programs, and handle multithreaded applications. Breakpoint types include conditional, logging, memory, and hardware breakpoints; execution tracing can log arguments for known functions. Patches can be retained between sessions, written back to executable files, and used to update fixups. An open architecture supports third-party plugins, and the maker provides a Plugin Development Kit with documented samples. Listed requirements include Windows 95, 98, NT 4.0, 2000, or higher; Win32s is unsupported. Development is frozen, and the 64-bit version is incomplete. Registration is free and requested for permanent or commercial use. The maker says original versions 1.00–1.10 do not communicate with other computers except for remote files specified by the user.