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<TITLE>Debugging with GDB: Annotations</TITLE>
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<H1> 25. GDB Annotations </H1>
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<!--docid::SEC646::-->
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<P>
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This chapter describes annotations in GDB. Annotations were
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designed to interface GDB to graphical user interfaces or other
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similar programs which want to interact with GDB at a
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relatively high level.
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</P><P>
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The annotation mechanism has largely been superseded by GDB/MI
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(see section <A HREF="gdb_25.html#SEC242">24. The GDB/MI Interface</A>).
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</P><P>
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<BLOCKQUOTE><TABLE BORDER=0 CELLSPACING=0>
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<TR><TD ALIGN="left" VALIGN="TOP"><A HREF="gdb_26.html#SEC647">25.1 What is an Annotation?</A></TD><TD> </TD><TD ALIGN="left" VALIGN="TOP">What annotations are; the general syntax.</TD></TR>
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<TR><TD ALIGN="left" VALIGN="TOP"><A HREF="gdb_26.html#SEC648">25.2 The Server Prefix</A></TD><TD> </TD><TD ALIGN="left" VALIGN="TOP">Issuing a command without affecting user state.</TD></TR>
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<TR><TD ALIGN="left" VALIGN="TOP"><A HREF="gdb_26.html#SEC649">25.3 Annotation for GDB Input</A></TD><TD> </TD><TD ALIGN="left" VALIGN="TOP">Annotations marking GDB's need for input.</TD></TR>
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<TR><TD ALIGN="left" VALIGN="TOP"><A HREF="gdb_26.html#SEC650">25.4 Errors</A></TD><TD> </TD><TD ALIGN="left" VALIGN="TOP">Annotations for error messages.</TD></TR>
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<TR><TD ALIGN="left" VALIGN="TOP"><A HREF="gdb_26.html#SEC651">25.5 Invalidation Notices</A></TD><TD> </TD><TD ALIGN="left" VALIGN="TOP">Some annotations describe things now invalid.</TD></TR>
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<TR><TD ALIGN="left" VALIGN="TOP"><A HREF="gdb_26.html#SEC652">25.6 Running the Program</A></TD><TD> </TD><TD ALIGN="left" VALIGN="TOP">Whether the program is running, how it stopped, etc.</TD></TR>
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<TR><TD ALIGN="left" VALIGN="TOP"><A HREF="gdb_26.html#SEC653">25.7 Displaying Source</A></TD><TD> </TD><TD ALIGN="left" VALIGN="TOP">Annotations describing source code.</TD></TR>
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</TABLE></BLOCKQUOTE>
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<P>
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<A NAME="Annotations Overview"></A>
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<HR SIZE="6">
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<A NAME="SEC647"></A>
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<TABLE CELLPADDING=1 CELLSPACING=1 BORDER=0>
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<TR><TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_26.html#SEC646"> < </A>]</TD>
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<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_toc.html#SEC_Contents">Contents</A>]</TD>
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<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_38.html#SEC764">Index</A>]</TD>
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<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_abt.html#SEC_About"> ? </A>]</TD>
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</TR></TABLE>
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<H2> 25.1 What is an Annotation? </H2>
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<!--docid::SEC647::-->
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<P>
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Annotations start with a newline character, two <SAMP>`control-z'</SAMP>
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characters, and the name of the annotation. If there is no additional
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information associated with this annotation, the name of the annotation
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is followed immediately by a newline. If there is additional
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information, the name of the annotation is followed by a space, the
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additional information, and a newline. The additional information
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cannot contain newline characters.
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</P><P>
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Any output not beginning with a newline and two <SAMP>`control-z'</SAMP>
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characters denotes literal output from GDB. Currently there is
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no need for GDB to output a newline followed by two
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<SAMP>`control-z'</SAMP> characters, but if there was such a need, the
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annotations could be extended with an <SAMP>`escape'</SAMP> annotation which
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means those three characters as output.
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</P><P>
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The annotation <VAR>level</VAR>, which is specified using the
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<SAMP>`--annotate'</SAMP> command line option (see section <A HREF="gdb_3.html#SEC9">2.1.2 Choosing Modes</A>), controls
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how much information GDB prints together with its prompt,
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values of expressions, source lines, and other types of output. Level 0
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is for no annotations, level 1 is for use when GDB is run as a
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subprocess of GNU Emacs, level 3 is the maximum annotation suitable
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for programs that control GDB, and level 2 annotations have
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been made obsolete (see section `Limitations of the Annotation Interface' in <CITE>GDB's Obsolete Annotations</CITE>).
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</P><P>
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<DL COMPACT>
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<A NAME="IDX1290"></A>
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<DT><CODE>set annotate <VAR>level</VAR></CODE>
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<DD>The GDB command <CODE>set annotate</CODE> sets the level of
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annotations to the specified <VAR>level</VAR>.
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<P>
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<DT><CODE>show annotate</CODE>
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<DD><A NAME="IDX1291"></A>
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Show the current annotation level.
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</DL>
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<P>
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This chapter describes level 3 annotations.
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</P><P>
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A simple example of starting up GDB with annotations is:
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</P><P>
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<TABLE><tr><td> </td><td class=smallexample><FONT SIZE=-1><pre>$ <KBD>gdb --annotate=3</KBD>
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GNU gdb 6.0
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Copyright 2003 Free Software Foundation, Inc.
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GDB is free software, covered by the GNU General Public License,
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and you are welcome to change it and/or distribute copies of it
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under certain conditions.
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Type "show copying" to see the conditions.
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There is absolutely no warranty for GDB. Type "show warranty"
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for details.
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This GDB was configured as "i386-pc-linux-gnu"
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^Z^Zpre-prompt
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(gdb)
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^Z^Zprompt
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<KBD>quit</KBD>
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^Z^Zpost-prompt
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$
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</FONT></pre></td></tr></table></P><P>
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Here <SAMP>`quit'</SAMP> is input to GDB; the rest is output from
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GDB. The three lines beginning <SAMP>`^Z^Z'</SAMP> (where <SAMP>`^Z'</SAMP>
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denotes a <SAMP>`control-z'</SAMP> character) are annotations; the rest is
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output from GDB.
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</P><P>
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<A NAME="Server Prefix"></A>
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<HR SIZE="6">
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<A NAME="SEC648"></A>
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<TABLE CELLPADDING=1 CELLSPACING=1 BORDER=0>
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<TR><TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_26.html#SEC647"> < </A>]</TD>
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<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_26.html#SEC649"> > </A>]</TD>
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<TD VALIGN="MIDDLE" ALIGN="LEFT"> <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_26.html#SEC649"> << </A>]</TD>
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<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_26.html#SEC646"> Up </A>]</TD>
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<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_27.html#SEC654"> >> </A>]</TD>
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<TD VALIGN="MIDDLE" ALIGN="LEFT"> <TD VALIGN="MIDDLE" ALIGN="LEFT"> <TD VALIGN="MIDDLE" ALIGN="LEFT"> <TD VALIGN="MIDDLE" ALIGN="LEFT"> <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb.html#SEC_Top">Top</A>]</TD>
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<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_toc.html#SEC_Contents">Contents</A>]</TD>
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<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_38.html#SEC764">Index</A>]</TD>
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<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_abt.html#SEC_About"> ? </A>]</TD>
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</TR></TABLE>
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<H2> 25.2 The Server Prefix </H2>
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<!--docid::SEC648::-->
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<P>
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If you prefix a command with <SAMP>`server '</SAMP> then it will not affect
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the command history, nor will it affect GDB's notion of which
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command to repeat if <KBD>RET</KBD> is pressed on a line by itself. This
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means that commands can be run behind a user's back by a front-end in
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a transparent manner.
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</P><P>
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The server prefix does not affect the recording of values into the value
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history; to print a value without recording it into the value history,
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use the <CODE>output</CODE> command instead of the <CODE>print</CODE> command.
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</P><P>
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<A NAME="Prompting"></A>
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<HR SIZE="6">
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<A NAME="SEC649"></A>
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<TABLE CELLPADDING=1 CELLSPACING=1 BORDER=0>
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<TR><TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_26.html#SEC648"> < </A>]</TD>
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<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_26.html#SEC650"> > </A>]</TD>
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<TD VALIGN="MIDDLE" ALIGN="LEFT"> <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_26.html#SEC650"> << </A>]</TD>
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<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_27.html#SEC654"> >> </A>]</TD>
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<TD VALIGN="MIDDLE" ALIGN="LEFT"> <TD VALIGN="MIDDLE" ALIGN="LEFT"> <TD VALIGN="MIDDLE" ALIGN="LEFT"> <TD VALIGN="MIDDLE" ALIGN="LEFT"> <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb.html#SEC_Top">Top</A>]</TD>
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<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_toc.html#SEC_Contents">Contents</A>]</TD>
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<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_38.html#SEC764">Index</A>]</TD>
|
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<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_abt.html#SEC_About"> ? </A>]</TD>
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</TR></TABLE>
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<H2> 25.3 Annotation for GDB Input </H2>
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<!--docid::SEC649::-->
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<P>
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<A NAME="IDX1292"></A>
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When GDB prompts for input, it annotates this fact so it is possible
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to know when to send output, when the output from a given command is
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over, etc.
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</P><P>
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Different kinds of input each have a different <EM>input type</EM>. Each
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input type has three annotations: a <CODE>pre-</CODE> annotation, which
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denotes the beginning of any prompt which is being output, a plain
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annotation, which denotes the end of the prompt, and then a <CODE>post-</CODE>
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annotation which denotes the end of any echo which may (or may not) be
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associated with the input. For example, the <CODE>prompt</CODE> input type
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features the following annotations:
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</P><P>
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<TABLE><tr><td> </td><td class=smallexample><FONT SIZE=-1><pre>^Z^Zpre-prompt
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^Z^Zprompt
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^Z^Zpost-prompt
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</FONT></pre></td></tr></table></P><P>
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The input types are
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</P><P>
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<DL COMPACT>
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<A NAME="IDX1293"></A>
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<A NAME="IDX1294"></A>
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<A NAME="IDX1295"></A>
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<DT><CODE>prompt</CODE>
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<DD>When GDB is prompting for a command (the main GDB prompt).
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<P>
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<A NAME="IDX1296"></A>
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<A NAME="IDX1297"></A>
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<A NAME="IDX1298"></A>
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<DT><CODE>commands</CODE>
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<DD>When GDB prompts for a set of commands, like in the <CODE>commands</CODE>
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command. The annotations are repeated for each command which is input.
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<P>
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<A NAME="IDX1299"></A>
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<A NAME="IDX1300"></A>
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<A NAME="IDX1301"></A>
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<DT><CODE>overload-choice</CODE>
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<DD>When GDB wants the user to select between various overloaded functions.
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<P>
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<A NAME="IDX1302"></A>
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<A NAME="IDX1303"></A>
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<A NAME="IDX1304"></A>
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<DT><CODE>query</CODE>
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<DD>When GDB wants the user to confirm a potentially dangerous operation.
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<P>
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<A NAME="IDX1305"></A>
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<A NAME="IDX1306"></A>
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<A NAME="IDX1307"></A>
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<DT><CODE>prompt-for-continue</CODE>
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<DD>When GDB is asking the user to press return to continue. Note: Don't
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expect this to work well; instead use <CODE>set height 0</CODE> to disable
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prompting. This is because the counting of lines is buggy in the
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presence of annotations.
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</DL>
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<P>
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<A NAME="Errors"></A>
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<HR SIZE="6">
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<A NAME="SEC650"></A>
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<TABLE CELLPADDING=1 CELLSPACING=1 BORDER=0>
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<TR><TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_26.html#SEC649"> < </A>]</TD>
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<TD VALIGN="MIDDLE" ALIGN="LEFT"> <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_26.html#SEC651"> << </A>]</TD>
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<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_26.html#SEC646"> Up </A>]</TD>
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<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_27.html#SEC654"> >> </A>]</TD>
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<TD VALIGN="MIDDLE" ALIGN="LEFT"> <TD VALIGN="MIDDLE" ALIGN="LEFT"> <TD VALIGN="MIDDLE" ALIGN="LEFT"> <TD VALIGN="MIDDLE" ALIGN="LEFT"> <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb.html#SEC_Top">Top</A>]</TD>
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<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_toc.html#SEC_Contents">Contents</A>]</TD>
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<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_38.html#SEC764">Index</A>]</TD>
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<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_abt.html#SEC_About"> ? </A>]</TD>
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</TR></TABLE>
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<H2> 25.4 Errors </H2>
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<!--docid::SEC650::-->
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<P>
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<A NAME="IDX1308"></A>
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<TABLE><tr><td> </td><td class=smallexample><FONT SIZE=-1><pre>^Z^Zquit
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</FONT></pre></td></tr></table></P><P>
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This annotation occurs right before GDB responds to an interrupt.
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</P><P>
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<A NAME="IDX1309"></A>
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<TABLE><tr><td> </td><td class=smallexample><FONT SIZE=-1><pre>^Z^Zerror
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</FONT></pre></td></tr></table></P><P>
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This annotation occurs right before GDB responds to an error.
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</P><P>
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Quit and error annotations indicate that any annotations which GDB was
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in the middle of may end abruptly. For example, if a
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<CODE>value-history-begin</CODE> annotation is followed by a <CODE>error</CODE>, one
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cannot expect to receive the matching <CODE>value-history-end</CODE>. One
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cannot expect not to receive it either, however; an error annotation
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does not necessarily mean that GDB is immediately returning all the way
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to the top level.
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</P><P>
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<A NAME="IDX1310"></A>
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A quit or error annotation may be preceded by
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</P><P>
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<TABLE><tr><td> </td><td class=smallexample><FONT SIZE=-1><pre>^Z^Zerror-begin
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</FONT></pre></td></tr></table></P><P>
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Any output between that and the quit or error annotation is the error
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message.
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</P><P>
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Warning messages are not yet annotated.
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</P><P>
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<A NAME="Invalidation"></A>
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<HR SIZE="6">
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<A NAME="SEC651"></A>
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<TABLE CELLPADDING=1 CELLSPACING=1 BORDER=0>
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<TR><TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_26.html#SEC650"> < </A>]</TD>
|
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<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_26.html#SEC652"> > </A>]</TD>
|
|
<TD VALIGN="MIDDLE" ALIGN="LEFT"> <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_26.html#SEC652"> << </A>]</TD>
|
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<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_26.html#SEC646"> Up </A>]</TD>
|
|
<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_27.html#SEC654"> >> </A>]</TD>
|
|
<TD VALIGN="MIDDLE" ALIGN="LEFT"> <TD VALIGN="MIDDLE" ALIGN="LEFT"> <TD VALIGN="MIDDLE" ALIGN="LEFT"> <TD VALIGN="MIDDLE" ALIGN="LEFT"> <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb.html#SEC_Top">Top</A>]</TD>
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<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_toc.html#SEC_Contents">Contents</A>]</TD>
|
|
<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_38.html#SEC764">Index</A>]</TD>
|
|
<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_abt.html#SEC_About"> ? </A>]</TD>
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</TR></TABLE>
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<H2> 25.5 Invalidation Notices </H2>
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<!--docid::SEC651::-->
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<P>
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|
|
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<A NAME="IDX1311"></A>
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The following annotations say that certain pieces of state may have
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|
changed.
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</P><P>
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|
|
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<DL COMPACT>
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<A NAME="IDX1312"></A>
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<DT><CODE>^Z^Zframes-invalid</CODE>
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|
<DD><P>
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|
|
|
The frames (for example, output from the <CODE>backtrace</CODE> command) may
|
|
have changed.
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|
</P><P>
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|
|
|
<A NAME="IDX1313"></A>
|
|
<DT><CODE>^Z^Zbreakpoints-invalid</CODE>
|
|
<DD><P>
|
|
|
|
The breakpoints may have changed. For example, the user just added or
|
|
deleted a breakpoint.
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</DL>
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|
<P>
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|
|
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<A NAME="Annotations for Running"></A>
|
|
<HR SIZE="6">
|
|
<A NAME="SEC652"></A>
|
|
<TABLE CELLPADDING=1 CELLSPACING=1 BORDER=0>
|
|
<TR><TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_26.html#SEC651"> < </A>]</TD>
|
|
<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_26.html#SEC653"> > </A>]</TD>
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<TD VALIGN="MIDDLE" ALIGN="LEFT"> <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_26.html#SEC653"> << </A>]</TD>
|
|
<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_26.html#SEC646"> Up </A>]</TD>
|
|
<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_27.html#SEC654"> >> </A>]</TD>
|
|
<TD VALIGN="MIDDLE" ALIGN="LEFT"> <TD VALIGN="MIDDLE" ALIGN="LEFT"> <TD VALIGN="MIDDLE" ALIGN="LEFT"> <TD VALIGN="MIDDLE" ALIGN="LEFT"> <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb.html#SEC_Top">Top</A>]</TD>
|
|
<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_toc.html#SEC_Contents">Contents</A>]</TD>
|
|
<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_38.html#SEC764">Index</A>]</TD>
|
|
<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_abt.html#SEC_About"> ? </A>]</TD>
|
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</TR></TABLE>
|
|
<H2> 25.6 Running the Program </H2>
|
|
<!--docid::SEC652::-->
|
|
<P>
|
|
|
|
<A NAME="IDX1314"></A>
|
|
<A NAME="IDX1315"></A>
|
|
When the program starts executing due to a GDB command such as
|
|
<CODE>step</CODE> or <CODE>continue</CODE>,
|
|
</P><P>
|
|
|
|
<TABLE><tr><td> </td><td class=smallexample><FONT SIZE=-1><pre>^Z^Zstarting
|
|
</FONT></pre></td></tr></table></P><P>
|
|
|
|
is output. When the program stops,
|
|
</P><P>
|
|
|
|
<TABLE><tr><td> </td><td class=smallexample><FONT SIZE=-1><pre>^Z^Zstopped
|
|
</FONT></pre></td></tr></table></P><P>
|
|
|
|
is output. Before the <CODE>stopped</CODE> annotation, a variety of
|
|
annotations describe how the program stopped.
|
|
</P><P>
|
|
|
|
<DL COMPACT>
|
|
<A NAME="IDX1316"></A>
|
|
<DT><CODE>^Z^Zexited <VAR>exit-status</VAR></CODE>
|
|
<DD>The program exited, and <VAR>exit-status</VAR> is the exit status (zero for
|
|
successful exit, otherwise nonzero).
|
|
<P>
|
|
|
|
<A NAME="IDX1317"></A>
|
|
<A NAME="IDX1318"></A>
|
|
<A NAME="IDX1319"></A>
|
|
<A NAME="IDX1320"></A>
|
|
<A NAME="IDX1321"></A>
|
|
<DT><CODE>^Z^Zsignalled</CODE>
|
|
<DD>The program exited with a signal. After the <CODE>^Z^Zsignalled</CODE>, the
|
|
annotation continues:
|
|
<P>
|
|
|
|
<TABLE><tr><td> </td><td class=smallexample><FONT SIZE=-1><pre><VAR>intro-text</VAR>
|
|
^Z^Zsignal-name
|
|
<VAR>name</VAR>
|
|
^Z^Zsignal-name-end
|
|
<VAR>middle-text</VAR>
|
|
^Z^Zsignal-string
|
|
<VAR>string</VAR>
|
|
^Z^Zsignal-string-end
|
|
<VAR>end-text</VAR>
|
|
</FONT></pre></td></tr></table></P><P>
|
|
|
|
where <VAR>name</VAR> is the name of the signal, such as <CODE>SIGILL</CODE> or
|
|
<CODE>SIGSEGV</CODE>, and <VAR>string</VAR> is the explanation of the signal, such
|
|
as <CODE>Illegal Instruction</CODE> or <CODE>Segmentation fault</CODE>.
|
|
<VAR>intro-text</VAR>, <VAR>middle-text</VAR>, and <VAR>end-text</VAR> are for the
|
|
user's benefit and have no particular format.
|
|
</P><P>
|
|
|
|
<A NAME="IDX1322"></A>
|
|
<DT><CODE>^Z^Zsignal</CODE>
|
|
<DD>The syntax of this annotation is just like <CODE>signalled</CODE>, but GDB is
|
|
just saying that the program received the signal, not that it was
|
|
terminated with it.
|
|
<P>
|
|
|
|
<A NAME="IDX1323"></A>
|
|
<DT><CODE>^Z^Zbreakpoint <VAR>number</VAR></CODE>
|
|
<DD>The program hit breakpoint number <VAR>number</VAR>.
|
|
<P>
|
|
|
|
<A NAME="IDX1324"></A>
|
|
<DT><CODE>^Z^Zwatchpoint <VAR>number</VAR></CODE>
|
|
<DD>The program hit watchpoint number <VAR>number</VAR>.
|
|
</DL>
|
|
<P>
|
|
|
|
<A NAME="Source Annotations"></A>
|
|
<HR SIZE="6">
|
|
<A NAME="SEC653"></A>
|
|
<TABLE CELLPADDING=1 CELLSPACING=1 BORDER=0>
|
|
<TR><TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_26.html#SEC652"> < </A>]</TD>
|
|
<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_27.html#SEC654"> > </A>]</TD>
|
|
<TD VALIGN="MIDDLE" ALIGN="LEFT"> <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_26.html#SEC646"> << </A>]</TD>
|
|
<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_26.html#SEC646"> Up </A>]</TD>
|
|
<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_27.html#SEC654"> >> </A>]</TD>
|
|
<TD VALIGN="MIDDLE" ALIGN="LEFT"> <TD VALIGN="MIDDLE" ALIGN="LEFT"> <TD VALIGN="MIDDLE" ALIGN="LEFT"> <TD VALIGN="MIDDLE" ALIGN="LEFT"> <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb.html#SEC_Top">Top</A>]</TD>
|
|
<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_toc.html#SEC_Contents">Contents</A>]</TD>
|
|
<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_38.html#SEC764">Index</A>]</TD>
|
|
<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_abt.html#SEC_About"> ? </A>]</TD>
|
|
</TR></TABLE>
|
|
<H2> 25.7 Displaying Source </H2>
|
|
<!--docid::SEC653::-->
|
|
<P>
|
|
|
|
<A NAME="IDX1325"></A>
|
|
The following annotation is used instead of displaying source code:
|
|
</P><P>
|
|
|
|
<TABLE><tr><td> </td><td class=smallexample><FONT SIZE=-1><pre>^Z^Zsource <VAR>filename</VAR>:<VAR>line</VAR>:<VAR>character</VAR>:<VAR>middle</VAR>:<VAR>addr</VAR>
|
|
</FONT></pre></td></tr></table></P><P>
|
|
|
|
where <VAR>filename</VAR> is an absolute file name indicating which source
|
|
file, <VAR>line</VAR> is the line number within that file (where 1 is the
|
|
first line in the file), <VAR>character</VAR> is the character position
|
|
within the file (where 0 is the first character in the file) (for most
|
|
debug formats this will necessarily point to the beginning of a line),
|
|
<VAR>middle</VAR> is <SAMP>`middle'</SAMP> if <VAR>addr</VAR> is in the middle of the
|
|
line, or <SAMP>`beg'</SAMP> if <VAR>addr</VAR> is at the beginning of the line, and
|
|
<VAR>addr</VAR> is the address in the target program associated with the
|
|
source which is being displayed. <VAR>addr</VAR> is in the form <SAMP>`0x'</SAMP>
|
|
followed by one or more lowercase hex digits (note that this does not
|
|
depend on the language).
|
|
</P><P>
|
|
|
|
<A NAME="GDB Bugs"></A>
|
|
<HR SIZE="6">
|
|
<TABLE CELLPADDING=1 CELLSPACING=1 BORDER=0>
|
|
<TR><TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_26.html#SEC646"> << </A>]</TD>
|
|
<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_27.html#SEC654"> >> </A>]</TD>
|
|
<TD VALIGN="MIDDLE" ALIGN="LEFT"> <TD VALIGN="MIDDLE" ALIGN="LEFT"> <TD VALIGN="MIDDLE" ALIGN="LEFT"> <TD VALIGN="MIDDLE" ALIGN="LEFT"> <TD VALIGN="MIDDLE" ALIGN="LEFT"> <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb.html#SEC_Top">Top</A>]</TD>
|
|
<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_toc.html#SEC_Contents">Contents</A>]</TD>
|
|
<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_38.html#SEC764">Index</A>]</TD>
|
|
<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_abt.html#SEC_About"> ? </A>]</TD>
|
|
</TR></TABLE>
|
|
<BR>
|
|
<FONT SIZE="-1">
|
|
|
|
<address>
|
|
|
|
<p>Please send FSF & GNU inquiries & questions to <a
|
|
href="mailto:gnu@gnu.org">gnu@gnu.org</a>. There are also <a
|
|
href="http://www.gnu.org/home.html#ContactInfo">other ways to
|
|
contact</a> the FSF.</p>
|
|
|
|
<p>These pages are maintained by <a
|
|
href="http://www.gnu.org/software/gdb/">the GDB developers</a>.</p>
|
|
|
|
<p>Copyright Free Software Foundation, Inc., 59 Temple Place - Suite
|
|
330, Boston, MA 02111, USA.</p>
|
|
|
|
<p>Verbatim copying and distribution of this entire article is
|
|
permitted in any medium, provided this notice is preserved.</p>
|
|
|
|
</address>
|
|
|
|
This document was generated
|
|
by <I>GDB Administrator</I> on <I>March, 27 2008</I>
|
|
using <A HREF="http://www.mathematik.uni-kl.de/~obachman/Texi2html
|
|
"><I>texi2html</I></A>
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</HTML>
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