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| <title>Debugging with GDB: Stack</title> |
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| <a name="Examining-the-Stack"></a> |
| <h2 class="chapter">8 Examining the Stack</h2> |
| |
| <p>When your program has stopped, the first thing you need to know is where it |
| stopped and how it got there. |
| </p> |
| <a name="index-call-stack"></a> |
| <p>Each time your program performs a function call, information about the call |
| is generated. |
| That information includes the location of the call in your program, |
| the arguments of the call, |
| and the local variables of the function being called. |
| The information is saved in a block of data called a <em>stack frame</em>. |
| The stack frames are allocated in a region of memory called the <em>call |
| stack</em>. |
| </p> |
| <p>When your program stops, the <small>GDB</small> commands for examining the |
| stack allow you to see all of this information. |
| </p> |
| <a name="index-selected-frame"></a> |
| <p>One of the stack frames is <em>selected</em> by <small>GDB</small> and many |
| <small>GDB</small> commands refer implicitly to the selected frame. In |
| particular, whenever you ask <small>GDB</small> for the value of a variable in |
| your program, the value is found in the selected frame. There are |
| special <small>GDB</small> commands to select whichever frame you are |
| interested in. See <a href="Selection.html#Selection">Selecting a Frame</a>. |
| </p> |
| <p>When your program stops, <small>GDB</small> automatically selects the |
| currently executing frame and describes it briefly, similar to the |
| <code>frame</code> command (see <a href="Frame-Info.html#Frame-Info">Information about a Frame</a>). |
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| <table class="menu" border="0" cellspacing="0"> |
| <tr><td align="left" valign="top">• <a href="Frames.html#Frames" accesskey="1">Frames</a>:</td><td> </td><td align="left" valign="top">Stack frames |
| </td></tr> |
| <tr><td align="left" valign="top">• <a href="Backtrace.html#Backtrace" accesskey="2">Backtrace</a>:</td><td> </td><td align="left" valign="top">Backtraces |
| </td></tr> |
| <tr><td align="left" valign="top">• <a href="Frame-Filter-Management.html#Frame-Filter-Management" accesskey="3">Frame Filter Management</a>:</td><td> </td><td align="left" valign="top">Managing frame filters |
| </td></tr> |
| <tr><td align="left" valign="top">• <a href="Selection.html#Selection" accesskey="4">Selection</a>:</td><td> </td><td align="left" valign="top">Selecting a frame |
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| <tr><td align="left" valign="top">• <a href="Frame-Info.html#Frame-Info" accesskey="5">Frame Info</a>:</td><td> </td><td align="left" valign="top">Information on a frame |
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| <tr><th colspan="3" align="left" valign="top"><pre class="menu-comment"> |
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