Interested in Debugging C++ or C programs on Windows and Linux. The following tutorials will run you through the debugging process quickly. Use of the Debugger in Visual C++ – Explains how to use the debugger in Visual C++ Versions 5 and 6. Debugging is the name given to the process of removing bugs from [...]

Xdebug is very powerful yet simple. It is missing only one feature, which is multi-user support. This requires the xdebug proxy to be supported. This allows multiple sessions to connect to the proxy with a different ide key (the argument for xdebug_session_start). Xdebug is an extension for php that provides debugging support. Put them together [...]

A quick summary of the commands provided by Perl Debugger and how to go about with debugging perl scripts. Related Terms – Perl Debugger Tool, Debugging Perl Cgi Scripts, Perl Ide Debugger, Perl Debug Command Line, Perl Debugger Unix, Perl Debugger Commands, Perl Tk Debugger, Perl Debug Module warn LIST Concatenates LIST, and prints result [...]

Here we will take a quick look at Perl Debugger. Familarity with using perl debugger is assumed. Related Terms – Debugging Tools, Perl Debugger Breakpoint, Perl Debug Command Line, Perl Debug Module, Perl Cgi Debug Before we even get to the debugger… Have you: Turned on warnings via use warnings or perl –w? Do you [...]

OllyDbg is a debugger that emphasizes binary code analysis, which is useful when source code is not available. It traces registers , recognizes procedures , API calls, switches, tables , constants and strings , as well as locates routines from object files and libraries. Olly Debugger Tutorial Beginner guide to use olly debugger Olly Debugger [...]

If you are serious about learning Valgrind, here are some very useful documents (PDF format. You need Adobe Acrobat to read it. Related Terms: Valgrind Memcheck, Valgrind Cachegrind, Valgrind Callgrind, Valgrind Ld_preload, Valgrind Memory Leaks, Valgrind Tutorial, Valgrind Debugger, Valgrind Stack Valgrind Documentation Valgrind HOWTO The Valgrind Memory Checker. (i.e., Your best friend.) Microsoft PowerPoint [...]

What Does Valgrind Do? Runs a program on a virtual CPU Is able to check every memory access Can check for memory leaks, errors Detects use of uninitialized memory Runs 25­50 slower Can handle optimized binary (with some footnotes) No need to generate special binary Running Valgrind in different modes: valgrind –tool=  program args Checker types: memcheck – A through memory analysis * massif – A Heap profiler * helgrind – A data­race (multi­threaded access) detector addrcheck – A lighter weight memory checker (fast) cachegrind – A processor cache hit/miss analyzer callgrind – A heavyweight profiler lackey ­­ simple profiler and memory tracer Other Experimental Variants: crocus – A signal call tracing tool interactive – Valgrind with a gdb like interface redux – A data flow tracer Memcheck tool Errors Detected: Use of uninitialised memory Reading/writing memory after it has been free’d Reading/writing off the end of malloc’d blocks Reading/writing inappropriate areas on the stack Memory leaks ­ where pointers to malloc’d blocks are lost forever Mismatched use of malloc/new/new [] vs free/delete/delete [] Overlapping src and dst pointers in memcpy() and related functions Not Detected: Bounds exceeded in stack or static arrays Memcheck tool Common Command Line Args For memcheck: ­­leak­check=yes    # Report on leak statisics ­­show­reachable=yes  # Report pointers still active Global Command Line Args (all tools)  ­v            # be verbose ­­log­file=file  # messages separated by pid e.g: file.pid1234 ­­log­file­exactly=file  # all messages into ‘file’ ­­log­fd=2  # merges output onto program’s stderr Making Options a Bit Easier: Options can come from 4 sources: command line Dot file in home directory .valgrindrc Environment variable $VALGRIND_OPTS Dot file in current directory .valgrindrc The syntax is: ­­toolname: option Example: ­­memcheck: leak­check=yes ­­memcheck: show­reachable=yes General Limitations: [...]