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1 DEBUG

Invokes the OpenVMS Debugger. For a complete description of the OpenVMS Debugger, see the OpenVMS Debugger Manual. To get help on debugger commands from DCL level, type the following command: $ HELP/LIBRARY=SYS$HELP:DBG$HELP DEBUG Format DEBUG 2 Heap_Analyzer The Heap Analyzer provides a graphical representation of memory use in real time. This allows you to quickly identify inefficient memory usage in your application such as allocations that are made too often, memory blocks that are too large, fragmentation, or memory leaks. For details on running the Heap Analyzer from within the debugger, see the OpenVMS Debugger Manual. To run the standalone Heap Analyzer, issue the following commands: $ DEFINE/USER/NAME=CONFINE LIBRTL SYS$LIBRARY:LIBRTL_INSTRUMENTED $ RUN/NODEBUG program 2 Qualifiers /KEEP Invokes the kept debugger. The kept debugger includes a Run/Rerun capability that allows you to debug an image multiple times or debug a series of distinct images without exiting the debugger. Issuing the DEBUG/KEEP command is the only way to invoke the kept debugger. /RESUME /RESUME (default) Reinvokes the non-kept debugger after a Ctrl/Y key sequence has interrupted the execution of a program you are debugging. (The interrupted program must not have been linked with a /NOTRACEBACK qualifier on the LINK command.) If you issue the DEBUG/RESUME command without a previous Ctrl/Y key sequence, no action occurs. 2 Examples 1.$ FORTRAN/DEBUG/NOOPTIMIZE WIDGET $ LINK/DEBUG WIDGET $ RUN WIDGET [ Debugger Banner and Version ] %DEBUG-I-INITIAL, language is FORTRAN, module set to WIDGET DBG> The FORTRAN and LINK commands both specify the /DEBUG qualifier to compile the program WIDGET.FOR with debugger symbol table information. Because the program has been compiled and linked with debug information, the debugger is automatically invoked by the image activator upon starting the program with the RUN command. No program code has yet been executed when the debugger is invoked. 2.$ FORTRAN/DEBUG/NOOPTIMIZE WIDGET $ LINK/DEBUG WIDGET $ RUN/NODEBUG WIDGET NAME: NAME: NAME: ^Y $ DEBUG/RESUME [ Debugger Banner and Version ] %DEBUG-I-INITIAL, language is FORTRAN, module set to WIDGET DBG> The FORTRAN and LINK commands both specify the /DEBUG qualifier to compile the program WIDGET.FOR with debugger symbol table information. The RUN command begins execution of the image WIDGET.EXE, which loops uncontrollably. Ctrl/Y interrupts the program, and the DEBUG/RESUME command gives control to the debugger. 3.$ CC/DEBUG/NOOPTIMIZE ECHOARGS $ LINK/DEBUG ECHOARGS $ ECHO == "$ sys$disk:[]echoargs.exe" $ DEBUG/KEEP [ Debugger Banner and Version ] DBG> RUN/COMMAND="ECHO"/ARGUMENTS="fa sol la mi" %DEBUG-I-INITIAL, language is C, module set to ECHOARGS %DEBUG-I-NOTATMAIN, type GO to get to start of main program DBG> . . . DBG> RERUN/ARGUMENTS="fee fii foo fum" %DEBUG-I-INITIAL, language is C, module set to ECHOARGS %DEBUG-I-NOTATMAIN, type GO to get to start of main program DBG> . . . DBG> RUN/ARGUMENTS="a b c" ECHOARGS %DEBUG-I-INITIAL, language is C, module set to ECHOARGS %DEBUG-I-NOTATMAIN, type GO to get to start of main program DBG> The CC and LINK commands both specify the /DEBUG qualifier to compile the program ECHOARGS.C with debugger symbol table information. The symbol definition command defines a foreign command for use during the debugging session. The DEBUG/KEEP command invokes the kept debugger. The first RUN command uses the /COMMAND qualifier to specify a foreign command to invoke the image file and the /ARGUMENTS qualifier to specify a string of arguments. The RERUN command reinvokes the same image file and uses the /ARGUMENTS qualifier to specify a new string of arguments. The second RUN command specifies a new image file and a new string of arguments. 4.$ PASCAL/DEBUG/NOOPTIMIZE 8QUEENS $ LINK/DEBUG 8QUEENS $ DEFINE/USER/NAME=CONFINE LIBRTL SYS$LIBRARY:LIBRTL_INSTRUMENTED $ RUN/NODEBUG 8QUEENS [Heap Analyzer window is displayed] The PASCAL and LINK commands both specify the /DEBUG qualifier to compile the program 8QUEENS.PAS with debugger symbol table information. The DEFINE command causes the Heap Analyzer to access a version of LIBRTL designed to collect memory allocation and deallocation information. The RUN/NODEBUG command invokes the Heap Analyzer but not the Debugger.

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