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Show the contents of the program registers, formated as signed integers Show the contents of the program registers Show information about the current stack frame If you need to peek inside registers or memory, Command

WXHEXEDITOR TABLE FILE CODE

Select the stack frame of the caller of the current stack frameĭiassemble the code for the current call frame.ĭiassemble the code for the function named mainĭiassemble the code for the function named main, with byte encoding of instructions includedĭiassemble 20 bytes starting at address 0x1234 Show a backtrace: a list of calls used to reach here To inspect the code and call stack, Command Set a breakpoint on the line 23 of foo.c (must be a line with code, not a comment, blank line, etc)ĭelete breakpoint number 1 (as indicated in the list) Set a breakpoint on the first line of main When run, the debugger pauses right before executing the code on which you place a breakpoint. 3.1.2 Commands controlling break pointsĪ breakpoint is a program location where the debugger pauses when running so you can see what’s around it. You might also want to use Ctrl+C to interrupt a program if it is running too long (this works on the command line for programs run without a debugger too). Resume running after run was interrupted (e.g., after a breakpoint or step). Step one ISA-instruction forward, skipping to return if stepping on call Step one ISA-instruction forward, entering functions if stepping on call Step one source-code-line forward, skipping to return if stepping on call Step one source-code-line forward, entering functions if stepping on call (re)start the program with command line arguments x, y, and z The following all assume you are in a debugger 3.1.1 Commands controlling running Command The following sections describe the important types of things you can do with lldb, organized by category of activity. Log into a computer with clang and LLDB (e.g. by SSHing into portal.cs. and running module load clang-llvm).

When using them on code you wrote, you want to compile with the -g flag to enable debugging symbols, which will make the debugger much more useful. We’ll use debuggers initially on binary files. The principles and commands described in this document are specific to the lldb debuggers under UNIX, but every debugger has similar commands. If a program crashes, the debugger can tell you exactly where the program crashed. While paused, we can find out where we are in the program, what values variables have, reset the values of variables, etc. The debugger allows us to control the execution of the program by pausing its execution and then resuming it. We think of a program running inside a debugger.

gdb is the debugger that was used in the past, and is often used elsewhere – it is analogous to lldb in how it worksĪ debugger is a utility program that allows you to run a program under development while controlling its execution and examining the internal values of variables.

LLVM is the compiler framework that includes many things, including the clang compiler that we are using, as well as lldb.

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