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425 lines
20 KiB
HTML
425 lines
20 KiB
HTML
15 years ago
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<HTML>
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<HEAD>
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<META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859-1">
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<META NAME="GENERATOR" CONTENT="Mozilla/4.06 [en] (X11; I; Linux 2.0.35 i686) [Netscape]">
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<TITLE>Source Window Help</TITLE>
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</HEAD>
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<BODY>
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<CENTER>
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<H1>The Source Window</H1></CENTER>
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<BR>The Source Window is the primary interface between the user and
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the debugger; it is automatically opened when the debugger starts. The
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Source Window displays the status of the program, controls execution of
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the program, and allows visualization of the program execution.
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<H3><A HREF="#menus">Menus</A></H3>
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<UL>
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<LI><A HREF="#menus_file">File Menu</A></LI>
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<LI><A HREF="#menus_run">Run Menu</A></LI>
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<LI><A HREF="#menus_view">View Menu</A></LI>
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<LI><A HREF="#menus_control">Control Menu</A></LI>
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<LI><A HREF="#menus_prefs">Preferences Menu</A></LI>
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</UL>
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<H3><A HREF="#toolbar">Toolbar</A></H3>
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<UL>
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<LI><A HREF="#toolbar_exec">Execution Control Buttons</A></LI>
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<LI><A HREF="#toolbar_window">Window Buttons</A></LI>
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<LI><A HREF="#toolbar_frame">Frame Control</A></LI>
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</UL>
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<H3><A HREF="#display">Source Window Display</A></H3>
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<UL>
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<LI><A HREF="#setting_a_breakpoint">Setting a Breakpoint</A></LI>
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<LI><A HREF="#viewing_breakpoints">Viewing Breakpoints</A></LI>
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<LI><A HREF="#display_balloon">Variable Balloons</A></LI>
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<LI><A HREF="#display_popup">Source Pop-up Menus</A></LI>
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</UL>
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<H3><A HREF="#status">Source Window Status Bars</A></H3>
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<UL>
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<LI><A HREF="#status_bar">Program Status Bar</A></LI>
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<LI><A HREF="#status_mode">Source Display Status Bar</A></LI>
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</UL>
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<H3><A HREF="#search">Search Entry</A></H3>
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<HR>
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<H2><A NAME="menus"></A>Menus</H2>
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<IMG SRC="images/src_menu.gif">
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<H4><A NAME="menus_file"></A>File Menu</H4>
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<DL>
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<DT>Open</DT>
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<DD>Opens a file selection dialog to select the executable to debug</DD>
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<DT>Close</DT>
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<DD>Closes a previously opened executable file</DD>
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<DT>Source</DT>
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<DD>Reads and executes GDB commands from a text file</DD>
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<DT>Target Settings...</DT>
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<DD>Opens the <A HREF="target.html">Target Selection Dialog</A> to edit target
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settings</DD>
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<DT>Page Setup</DT>
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<DD>(Windows only) Opens the Windows Page Setup dialog to configure printing</DD>
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<DT>Print</DT>
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<DD>Print the contents of the Source Window Display</DD>
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<DT>Exit</DT>
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<DD>Exits the debugger</DD>
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</DL>
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<H4><A NAME="menus_run"></A>Run Menu</H4>
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<DL>
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<DT>Connect to target</DT>
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<DD>Connect to the target specified in the <A HREF="target.html">Target Selection Dialog</A>. Open the dialog if there are no current settings.</DD>
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<DT>Download</DT>
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<DD>Initiates download of the executable onto the target via the protocol specified
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in the <A HREF="target.html">Target Selection Dialog</A></DD>
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<DT>Run</DT>
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<DD>Runs or re-runs the program</DD>
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<DT>Disconnect</DT>
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<DD>Close a previously opened connection</DD>
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</DL>
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<H4><A NAME="menus_view"></A>View Menu</H4>
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<DL>
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<DT>Stack</DT>
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<DD>Open a <A HREF="stack.html">Stack Window</A></DD>
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<DT>Registers</DT>
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<DD>Open a <A HREF="register.html">Register Window</A></DD>
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<DT>Memory</DT>
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<DD>Open a <A HREF="memory.html">Memory Window</A></DD>
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<DT>Watch Expressions</DT>
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<DD>Open a <A HREF="watch.html">Watch Window</A></DD>
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<DT>Local Variables</DT>
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<DD>Open a <A HREF="locals.html">Locals Window</A></DD>
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<DT>Breakpoints</DT>
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<DD>Open a <A HREF="breakpoint.html">Breakpoint Window</A></DD>
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<DT>Console</DT>
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<DD>Open a <A HREF="console.html">Console Window</A></DD>
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<DT>Function Browser</DT>
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<DD>Open a window allowing the user to easily search for functions and
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set breakpoints.</DD>
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<DT>Thread List</DT>
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<DD>Open a window that displays all current threads and allows the user
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to change active threads</DD>
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</DL>
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<H4><A NAME="menus_control"></A>Control Menu</H4>
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<DL>
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<DT><A HREF="#step_button">Step</A></DT>
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<DD>Step program until it reaches a different source line</DD>
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<DT><A HREF="#next_button">Next</A></DT>
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<DD>Step program, proceeding through subroutine calls</DD>
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<DT><A HREF="#finish_button">Finish</A></DT>
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<DD>Execute until the current stack frame returns</DD>
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<DT><A HREF="#continue_button">Continue</A></DT>
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<DD>Continue program being debugged, after signal or breakpoint</DD>
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<DT><A HREF="#stepi_button">Step Asm Inst</A></DT>
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<DD>Step one instruction exactly</DD>
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<DT><A HREF="#nexti_button">Next Asm Inst</A></DT>
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<DD>Step one instruction, but proceed through subroutine calls</DD>
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<DT>Automatic Step</DT>
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<DD>Automatically step the program every two seconds</DD>
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</DL>
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<H4><A NAME="menus_prefs"></A>Preferences Menu</H4>
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<DL>
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<DT>Global</DT>
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<DD>Opens the <A HREF="gbl_pref.html">Global Preferences Dialog</A> and allows
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editing of global settings</DD>
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<DT>Source</DT>
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<DD>Opens the <A HREF="src_pref.html">Source Preferences Dialog</A> and allows
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editing of Source Window settings</DD>
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</DL>
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<HR>
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<H2><A NAME="toolbar"></A>Toolbar</H2>
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<IMG SRC="images/src_toolbar.gif">
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The Source Window toolbar consists of three functional sections: execution
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control buttons, debugger window buttons, and stack frame control buttons.
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<BR>
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<H4><A NAME="toolbar_exec"></A>Execution Control Buttons</H4>
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These convenience buttons provide on-screen access to the most important
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debugger execution control functions:
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<DL>
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<DT><A NAME="run_button"></A><IMG SRC="../images/run.gif"> or
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<IMG SRC="../images2/run.gif"> Run </DT>
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<DD>The Run Button will start execution of the program, including target selection
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and downloading, if necessary. If the program is already running, the Run
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Button will start the program from the beginning (re-run it).</DD>
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<DT><A NAME="stop_button"></A><IMG SRC="../images/stop.gif"> or
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<IMG SRC="../images2/stop.gif"> Stop</DT>
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<DD>The Stop Button will interrupt execution of the program (provided this
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feature is supported by the underlying debugging protocol and hardware)
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or cancel downloads. It is also used as an indication that the debugger
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is busy.</DD>
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<DT><A NAME="step_button"></A><IMG SRC="../images/step.gif"> or <IMG SRC="../images2/step.gif">Step</DT>
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<DD>Step the program until it reaches a different source line</DD>
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<DT><A NAME="next_button"></A><IMG SRC="../images/next.gif"> or <IMG SRC="../images2/next.gif">Next</DT>
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<DD>Step the program, proceeding through subroutine calls</DD>
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<DT><A NAME="finish_button"></A><IMG SRC="../images/finish.gif"> or <IMG SRC="../images2/finish.gif"> Finish</DT>
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<DD>Execute until the current stack frame returns</DD>
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<DT><A NAME="continue_button"></A><IMG SRC="../images/continue.gif"> or <IMG SRC="../images2/continue.gif"> Continue</DT>
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<DD>Continue the program being debugged, after signal or breakpoint</DD>
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<DT><A NAME="stepi_button"></A><IMG SRC="../images/stepi.gif"> or <IMG SRC="../images2/stepi.gif"> Step Asm Inst</DT>
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<DD>Step one instruction exactly. This function is only available when the
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Source Window is displaying assembler code.</DD>
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<DT><A NAME="nexti_button"></A><IMG SRC="../images/nexti.gif"> or <IMG SRC="../images2/nexti.gif"> Next Asm Inst</DT>
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<DD>Step one instruction, but proceed through subroutine calls. This function
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is only available when the Source Window is displaying assembler code.</DD>
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</DL>
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<H4>
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<A NAME="toolbar_window"></A>Window Buttons</H4>
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The Debugger Window buttons give instant access to the Debugger's auxiliary
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windows:
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<DL>
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<DT><A NAME="register_button"></A><IMG SRC="../images/reg.gif"> or <IMG SRC="../images2/reg.gif"> Registers</DT>
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<DD>Open a <A HREF="register.html">Register Window</A></DD>
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<DT><A NAME="memory_button"></A><IMG SRC="../images/memory.gif"> or <IMG SRC="../images2/memory.gif"> Memory</DT>
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<DD>Open a <A HREF="memory.html">Memory Window</A></DD>
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<DT><A NAME="stack_button"></A><IMG SRC="../images/stack.gif"> or <IMG SRC="../images2/stack.gif"> Stack</DT>
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<DD>Open a <A HREF="stack.html">Stack Window</A></DD>
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<DT><A NAME="watch_button"></A><IMG SRC="../images/watch.gif"> or <IMG SRC="../images2/watch.gif"> Watch Expressions</DT>
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<DD>Open a <A HREF="watch.html">Watch Window</A></DD>
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<DT><A NAME="locals_button"></A><IMG SRC="../images/vars.gif"> or <IMG SRC="../images2/vars.gif"> Local Variables</DT>
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<DD>Open a <A HREF="locals.html">Locals Window</A></DD>
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<DT><A NAME="breakpoints_button"></A><IMG SRC="../images/bp.gif"> or <IMG SRC="../images2/bp.gif"> Breakpoints</DT>
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<DD>Open a <A HREF="breakpoint.html">Breakpoint Window</A></DD>
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<DT><A NAME="console_button"></A><IMG SRC="../images/console.gif"> or <IMG SRC="../images2/console.gif"> Console</DT>
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<DD>Open a <A HREF="console.html">Console Window</A></DD>
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</DL>
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<H4><A NAME="toolbar_frame"></A>Frame Control</H4>
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The Frame Control area of the toolbar displays information about the PC
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of the current frame, and the frame control buttons may be used to navigate
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through the call stack. Whenever any of these buttons are used, both the
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Source Window Display and the <A HREF="stack.html">Stack Window</A> will
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show the selected frame.
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<DL>
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<DT><IMG SRC="images/frame_info.gif" > Frame Information Display</DT>
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<DD>The left half of the frame information display shows the value of the PC
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in the current frame. The right half shows the line number of the PC in
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the source file, if available.</DD>
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<DT><A NAME="up_button"></A><IMG SRC="../images/up.gif"> or <IMG SRC="../images2/up.gif"> Up</DT>
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<DD>Select and view the stack frame that called this one</DD>
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<DT><A NAME="down_button"></A><IMG SRC="../images/down.gif"> or <IMG SRC="../images2/down.gif"> Down</DT>
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<DD>Select and view the stack frame called by this one</DD>
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<DT><A NAME="bottom_button"></A><IMG SRC="../images/bottom.gif"> or <IMG SRC="../images2/bottom.gif"> Bottom</DT>
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<DD>Select and view the bottom-most stack frame</DD>
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</DL>
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<HR>
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<H2><A NAME="display"></A>Source Display</H2>
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The Source Display is used for many things: browsing source code, setting
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and clearing breakpoints, and a few other special functions. Executable
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lines (those for which executable code was generated by the compiler) are
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denoted with a marker (a dash, "-") in the first column of the display.
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<P>The debugger highlights the PC in the current frame in either green,
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indicating that the PC is in the bottom-most frame (i.e., it is being executed)
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or gold, indicating that the PC is contained in a frame that is not currently
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executing (because it has called another function). A blue highlight is
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used by the debugger to indicate a browsing position: the PC is contained
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in a frame that is not executing or on the call stack. All highlight colors
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are user selectable in the <A HREF="src_pref.html">Source Preferences</A>.
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<BR>
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<H4><A NAME="setting_a_breakpoint"></A>Setting a Breakpoint</H4>
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Moving the mouse pointer over the "hot spot" of an executable line will
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change the mouse cursor to a large dot. Clicking the left mouse button
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will then toggle a breakpoint at this line. If no breakpoint exists, one
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will be installed and the dash in the left margin will change into a red
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breakdot. If a breakpoint exists, it will be removed and the red breakdot
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will revert back to a dash. The executable line marker shows the status
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of each line: an empty marker (the dash) indicates that no breakpoints
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are set at the line. A colored breakdot indicates that a breakpoint exists
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at the line (see <A HREF="#display_popup">Source Pop-up Menus</A> for more
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information on setting different types of breakpoints and their representations
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in the Source Display).
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<P>Black breakdots in the Source Window display indicate that the breakpoint
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has been disabled. To re-enable the breakpoint, click the enable/disable
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checkbox in the Breakpoint Window (see <A HREF="breakpoint.html#display_state">
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Enabling/Disabling Breakpoints</A>).
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<BR>
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<H4><A NAME="viewing_breakpoints"></A>Viewing Breakpoints</H4>
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You can find out more information about a breakpoint by moving the cursor
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over a breakpoint. A balloon window will pop up with additional information.
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To get a list of all the active breakpoints, you will need to open a
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<A HREF="breakpoint.html">breakpoint window</A>.
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<IMG SRC="images/src_bp_bal.gif">
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<BR>
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<H4><A NAME="display_balloon"></A>Variable Balloons</H4>
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If the program to be debugged has started and is stopped, the display
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will show the value of variables in variable
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balloons. To activate a variable balloon, simply hold the mouse cursor
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over the name of a variable in the Source Display for a second or two:
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the debugger displays the name of the variable, its type, and its value
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in a pop-up balloon.
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<IMG SRC="images/src_bal.gif">
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<BR>
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<H4><A NAME="display_popup"></A>Source Pop-up Menus</H4>
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The Source Display has two pop-up menus. One is activated by clicking the
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right mouse button when the mouse cursor is over an executable line marker's
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hot spot. This pop-up menu looks like this:
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<P><IMG SRC="images/src_bpop.gif">
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<DL>
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<DT>Continue to Here</DT>
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<DD>Continue program execution until it reaches this point. All breakpoints
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will be ignored. Be aware that if the program never executes the line you selected,
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it will run until completion.</DD>
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<DT>Set Breakpoint</DT>
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<DD>Set a breakpoint at this line. This has the same effect as left clicking
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on this line. Breakpoints are shown as red breakdots in the Source Window
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Display.</DD>
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<DT>Set Temporary Breakpoint</DT>
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<DD>Set a temporary breakpoint at this line. Temporary breakpoints are shown
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as orange breakdots in the Source Window Display. The remove themselves automatically
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the first time they are hit.</DD>
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<A NAME="thread_bp"></A>
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<DT>Set Breakpoint on Thread(s)...</DT>
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<DD>GDB allows the user to set a breakpoint on a particular thread or threads. This
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menu item will display a dialog with a list of threads. The user can select a list
|
||
|
|
of threads that will have breakpoints set at the selected line number. A warning
|
||
|
|
will be displayed if there are no active threads.</DD>
|
||
|
|
<IMG SRC="images/src_thread.gif">
|
||
|
|
</DL>
|
||
|
|
|
||
|
|
The other pop-up menu is activated by clicking the right mouse button anywhere
|
||
|
|
else in the Source Display. It is only available when a variable or number
|
||
|
|
in the display lies below the mouse cursor or is selected (by clicking
|
||
|
|
the left mouse button and dragging the mouse to highlight the variable/number).
|
||
|
|
The pop-up menu looks like this:
|
||
|
|
<P><IMG SRC="images/src_pop.gif">
|
||
|
|
<DL>
|
||
|
|
<DT><A NAME="add_to_watch"></A>Add <I>expr</I> to Watch</DT>
|
||
|
|
<DD>Adds the selected expression to the <A HREF="watch.html">Watch Window</A>,
|
||
|
|
opening it, if necessary.</DD>
|
||
|
|
<DT>Dump Memory at <I>expr</I></DT>
|
||
|
|
<DD>Opens a new <A HREF="memory.html">Memory Window</A> at the selected expression.
|
||
|
|
If the expression is a variable, then the Memory Window is opened with
|
||
|
|
memory addresses starting at the value of the variable.</DD>
|
||
|
|
<DT>Open Another SOurce Window</DT>
|
||
|
|
<DD>GDB allows multiple source windows to co-exist. You can, for example, have
|
||
|
|
one window in source mode and one in assembly mode. Or you can use one window
|
||
|
|
to browse the stack or other files.</DD>
|
||
|
|
</DL>
|
||
|
|
|
||
|
|
<H4><A NAME="status"></A>Source Window Status Bars</H4>
|
||
|
|
The Source Window has two status bars which inform the user of the status
|
||
|
|
of the program (the "status bar") and the status of the Source Window.
|
||
|
|
<P>The <A NAME="status_bar"></A>Program Status Bar (or simply "Status
|
||
|
|
Bar") displays the status of the program. Common messages seen here include:
|
||
|
|
<DL>
|
||
|
|
<DT>No program loaded.</DT>
|
||
|
|
<DD>No program has been loaded into target memory.</DD>
|
||
|
|
<DT>Program is ready to run.</DT>
|
||
|
|
<DD>A program has been loaded into target memory and may be executed. Start
|
||
|
|
the program by hitting <A HREF="#run_button">Run</A>.</DD>
|
||
|
|
<DT>Program stopped at <I>line/address</I></DT>
|
||
|
|
<DD>The program stopped at line <I>line</I> or address <I>address</I>. Execution
|
||
|
|
may continue by hitting any of the <A HREF="#toolbar_exec">execution control
|
||
|
|
buttons</A> on the toolbar.</DD>
|
||
|
|
<DT>Program terminated. 'Run' will restart.</DT>
|
||
|
|
<DD>The program exited. Pressing <A HREF="#run_button">Run</A> will restart
|
||
|
|
it.</DD>
|
||
|
|
</DL>
|
||
|
|
|
||
|
|
The Status Bar also displays some help information. For instance, the Status
|
||
|
|
Bar will show the function of a button on the toolbar or the Source Display
|
||
|
|
Status Bar as well as any keyboard shortcut for any button in the Source
|
||
|
|
Window.
|
||
|
|
|
||
|
|
<BR>
|
||
|
|
<H4><A NAME="status_mode"></A>Source Display Status Bar</H4>
|
||
|
|
<IMG SRC="images/src_stat.gif">
|
||
|
|
The Source Display Status Bar shows the current state of the Source Window:
|
||
|
|
the name of the file displayed in the Display, the name of the function
|
||
|
|
in the Display which contains the PC for the current frame (if any), and
|
||
|
|
the display mode.
|
||
|
|
<P>The <A NAME="file_selector"></A>Source File Selector is a dropdown
|
||
|
|
menu which contains the names of all the files that were compiled into
|
||
|
|
the program being debugged.
|
||
|
|
<P>Normally, the File Selector displays the name of the file currently
|
||
|
|
being viewed, but any file from the dropdown menu may be selected for browsing.
|
||
|
|
Simply select the file to view from the available choices (or type it directly
|
||
|
|
into the File Selector) and the Source Window will load that file into
|
||
|
|
the Display. To return to the PC of the program, simply press the
|
||
|
|
<A HREF="#bottom_button">Bottom
|
||
|
|
Frame Control Button</A>.
|
||
|
|
<P>The <A NAME="function_selector"></A>Source Function Selector displays
|
||
|
|
the name of the function containing the Source Window's PC, if one exists,
|
||
|
|
but it may be used to browse any function in the current file. Simply type
|
||
|
|
the name of the desired function into the Function Selector or select it
|
||
|
|
from the dropdown menu. The Source Window's PC is updated to point at this
|
||
|
|
function. To return to the PC of the program, simply press the
|
||
|
|
<A HREF="#bottom_button">Bottom
|
||
|
|
Frame Control Button</A>.
|
||
|
|
<P>The <A NAME="mode_selector"></A>Source Display Mode Selector displays
|
||
|
|
the viewing mode of the current file/function shown in the Source Window
|
||
|
|
Display.
|
||
|
|
<P>The function of the "step" keyboard shortcut will differ depending on
|
||
|
|
the mode the Source Window Display. "Stepping" in Source Mode (or in the
|
||
|
|
Source Pane of SRC+ASM Mode) will cause a source-level step. "Stepping"
|
||
|
|
in Assembly or Mixed Mode (or in the Assembly Pane of the SRC+ASM Mode)
|
||
|
|
will cause the debugger to step exactly one machine instruction. This also
|
||
|
|
applies to the shortcut for "next".
|
||
|
|
<P>The Display Mode Selector may be used to change the view of the current
|
||
|
|
source file. The available display modes are
|
||
|
|
<DL>
|
||
|
|
<DT>SOURCE</DT>
|
||
|
|
<DD>The contents of the Display are shown as source code. If source code is
|
||
|
|
not available (either because no debugging information is available or
|
||
|
|
the source file is not found), the Source Window will temporarily set the Display
|
||
|
|
Mode to "ASSEMBLY".</DD>
|
||
|
|
<DT>ASSEMBLY</DT>
|
||
|
|
<DD>A disassembly of the target's memory is shown in the Display. Even assembly
|
||
|
|
source files show a disassembly of target memory; to see the assembly source
|
||
|
|
code, use the SOURCE mode. Note that the debugger can only display assembly
|
||
|
|
code on a function-by-function basis. It cannot display all the instructions
|
||
|
|
generated from a single source file.</DD>
|
||
|
|
<DT>MIXED</DT>
|
||
|
|
<DD>The Display shows source code mixed with the assembler instructions which
|
||
|
|
were generated for those lines by the compiler for the current function.
|
||
|
|
Note that the addresses of the assembly lines is not necessarily monotonically
|
||
|
|
increasing. If the source file associated with the function cannot be found,
|
||
|
|
the Source Window will revert to ASSEMBLY mode.</DD>
|
||
|
|
<DT>SRC+ASM</DT>
|
||
|
|
<DD>The Source Window Display is divided into two panes: an assembly pane and
|
||
|
|
a source pane. Breakpoints may be set/cleared in either pane.</DD>
|
||
|
|
</DL>
|
||
|
|
|
||
|
|
<HR>
|
||
|
|
|
||
|
|
<H2><A NAME="search"></A>Search Entry</H2>
|
||
|
|
The Search Entry facilitates searching for text in the Source Window Display.
|
||
|
|
Simply enter the text to be found into the Search Entry and press the Enter
|
||
|
|
key on the keyboard to search forwards in the Source Window Display (hold
|
||
|
|
down the Shift key to search backwards). If a match is found, it is highlighted
|
||
|
|
in the Source Window and the Program Status Bar displays information about
|
||
|
|
where the match was found.
|
||
|
|
<P>The Search Entry can also jump the Source Window to a specific line.
|
||
|
|
Enter the line number preceded by an "at" sign (@) into the Search Entry
|
||
|
|
and press enter. If entered line number is greater than the total number
|
||
|
|
of lines in the Source Window Display, the Display will jump to the end
|
||
|
|
of the current file.
|
||
|
|
</BODY>
|
||
|
|
</HTML>
|