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<strong>Tornado</strong> 2.0 User’s Guide load filename serverFilename Use this version of the load command when the target server you are using is on a host with a different view of the file system from your CrossWind session. For example, in some complex networks different hosts may mount the same file at different points: you may want to download a file /usr/fred/applic.o which your target server on another host sees as /fredshost/fred/applic.o. 4 Use the serverFilename argument to specify what file to download from the server’s point of view. (You must also specify the filename argument from the local point of view for the benefit of the debugger itself.) See 5.6 Object Module Load Path, p.196 for a more extended discussion of the same problem in the context of the shell. unload filename Undo the effect of load: remove a dynamically linked file from the target, and delete its symbols from the debugger session. The load and unload commands both request confirmation if the debugger is attached to an active task. You can disable this confirmation request, as well as all other debugger confirmation requests, with set confirm. See GDB User’s Guide: Controlling GDB. What Code to Display After a debugging session is underway, the program-display panel keeps pace with execution: when the program hits a breakpoint, the corresponding source is centered on the display panel, and each time you step or continue program execution, the display scrolls accordingly. When you begin your debugging session by attaching to an existing task, the display panel is filled immediately as a side effect of stopping the task. In other situations, it may be convenient to use one of the commands in this section for an initial display. list linespec Displays source code immediately in the program-display panel, with the display centered around the line you specify with the linespec argument. The most common forms for linespec are a routine name (which identifies the place where that subroutine begins executing) or a source-file line number in the 4. See also the description of wtx-load-path-qualify in Extended Debugger Variables, p.259 for another way of managing how the debugger reports load pathnames to the target server. 254
7 Debugger form filename:num (the source file name, a colon, and a line number). For a full description of linespec formats, see GDB User’s Guide: Printing Source Lines. search regexp Displays code centered around the first line (in the current source file) that contains the regular expression regexp, instead of specifying what line to display. The command rev is similar, but searches backwards from the current context. See GDB User’s Guide: Searching Source Files. break fn Sets a breakpoint at fn. Instead of first displaying source code, then setting breakpoints using the graphical interface, you can set a breakpoint directly (if you know where to go!). The argument fn can be a function name or a line number. See GDB User’s Guide: Setting Breakpoints. The break command does not produce a display directly, but sets things up so that there is at least one place where your program suspends. You can use run to start the program (except in system mode); when the program suspends at the breakpoint, the display panel shows the context. 7 Executing Your Program Just as with the <strong>Tornado</strong> shell, you can execute any subroutine in your application from the debugger. Use the following commands: run routine args This is the principal command used to begin execution under debugger control. Execution begins at routine; you can specify an argument list after the routine name, with the arguments separated by spaces. The argument list may not contain floating-point or double-precision values. (This command is not available in system mode; use the shell to get tasks started in that mode. See 5.2.6 Using the Shell for System Mode Debugging, p.170.) call expr If a task is already running (and suspended, so that the debugger has control), you can evaluate any source-language expression (including subroutine calls) with the call command. This provides a way of exploring the effects of other subroutines without abandoning the suspended call. Subroutine arguments in the expression expr may be of any type, including floating point or double precision. When you run a routine from the debugger using one of these commands, the routine runs until it encounters a breakpoint or a signal, or until it completes execution. The normal practice is to set one or more breakpoints in contexts of 255
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E X Resources E.1 Predefined X Reso
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Index Symbols ? (C/Tcl interpreter
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Index assembler options, specifying
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Index download options 260 download
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Index creating 100 linking 103 open
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Index info command (CrossWind) 258
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Index O Object Modules folder 102 O
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Index unreserved 82 virtual console
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