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Tornado 2.0 User’s Guide proc traverse head { for {set pNode [gdbEvalScalar "$head"] }\ {$pNode} \ {set pNode [gdbEvalScalar "( (struct node *)$pNode)->next"]} \ {puts stdout $pNode} } In the body of the loop, the Tcl command puts prints the address of the node. To type the procedure directly into the command panel would require prefacing the text above with the tcl command, and would require additional backslashes (one at the end of every line). If pList is a variable of type (struct *node), you can execute: (gdb) tcl traverse pList The procedure displays the address of each node in the list. For a list with two elements, the output would look something like the following: 0xffeb00 0xffea2c It might be more useful to redefine the procedure body to print out the integer member data, instead. For example, replace the last line with the following: {puts stdout [format "data = %d" \ [gdbEvalScalar "((struct node *) $pNode)->data"]]} You can bind a new GDB command to this Tcl procedure by using tclproc (typically, in the same Tcl script file as the procedure definition): tclproc traverse traverse The traverse command can be abbreviated, like any GDB command. With these definitions, you can type the following command: (gdb) trav pList The output now exhibits the contents of each node in the list: data = 1 data = 2 272
7 Debugger 7.7 Tcl: CrossWind Customization Like every other Tornado tool, the CrossWind graphical user interface is “soft” (amenable to customization) because it is written in Tcl, which is an interpreted language. Tornado API Guide: UI Tcl describes the graphical building blocks available; you can also study the Tcl implementation of CrossWind itself. You can find the source in host/resource/tcl/CrossWind.tcl. 7.7.1 Tcl: Debugger Initialization Files 7 You can write Tcl code to customize the debugger’s graphical presentation in a file called .wind/crosswind.tcl under your home directory. Use this file to collect your custom modifications, or to incorporate shared customizations from a central repository of Tcl extensions at your site. Recall that the debugger uses two separate Tcl interpreters. Previous sections described the .gdbinit and ~/.wind/gdb.tcl initialization files that initialize the debugger command language (see 7.6 Tcl: Debugger Automation, p.266). The following outline summarizes the role of all the CrossWind customization files. The files are listed in the order in which they execute. ~/.wind/gdb.tcl Use this file to customize the Tcl interpreter built into GDB itself (for example, to define Tcl procedures for new GDB commands). This file is unique to the CrossWind version of GDB. ~/.gdbinit Use this file for any initialization you want to perform in GDB’s command language rather than in Tcl. This file is not unique to CrossWind; it is shared by any other GDB configuration you may install. ${PWD}/.gdbinit Akin to the .gdbinit in your home directory, this file also contains commands in GDB’s command language, and is not unique to the CrossWind configuration of GDB. However, this file is specific to a particular working directory; thus it may be an appropriate place to record application-specific debugger settings. ~/.wind/crosswind.tcl Use this file to customize the debugger’s graphical presentation, using Tcl: for example, to define new buttons or menu commands. This file is unique to the CrossWind version of GDB. 273
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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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