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| <a name="All-Debuggers"></a> |
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| Next: <a href="DBX-Options.html#DBX-Options" accesskey="n" rel="next">DBX Options</a>, Up: <a href="Debugging-Info.html#Debugging-Info" accesskey="u" rel="up">Debugging Info</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p> |
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| <a name="Macros-Affecting-All-Debugging-Formats"></a> |
| <h4 class="subsection">17.21.1 Macros Affecting All Debugging Formats</h4> |
| |
| <p>These macros affect all debugging formats. |
| </p> |
| <dl> |
| <dt><a name="index-DBX_005fREGISTER_005fNUMBER"></a>Macro: <strong>DBX_REGISTER_NUMBER</strong> <em>(<var>regno</var>)</em></dt> |
| <dd><p>A C expression that returns the DBX register number for the compiler |
| register number <var>regno</var>. In the default macro provided, the value |
| of this expression will be <var>regno</var> itself. But sometimes there are |
| some registers that the compiler knows about and DBX does not, or vice |
| versa. In such cases, some register may need to have one number in the |
| compiler and another for DBX. |
| </p> |
| <p>If two registers have consecutive numbers inside GCC, and they can be |
| used as a pair to hold a multiword value, then they <em>must</em> have |
| consecutive numbers after renumbering with <code>DBX_REGISTER_NUMBER</code>. |
| Otherwise, debuggers will be unable to access such a pair, because they |
| expect register pairs to be consecutive in their own numbering scheme. |
| </p> |
| <p>If you find yourself defining <code>DBX_REGISTER_NUMBER</code> in way that |
| does not preserve register pairs, then what you must do instead is |
| redefine the actual register numbering scheme. |
| </p></dd></dl> |
| |
| <dl> |
| <dt><a name="index-DEBUGGER_005fAUTO_005fOFFSET"></a>Macro: <strong>DEBUGGER_AUTO_OFFSET</strong> <em>(<var>x</var>)</em></dt> |
| <dd><p>A C expression that returns the integer offset value for an automatic |
| variable having address <var>x</var> (an RTL expression). The default |
| computation assumes that <var>x</var> is based on the frame-pointer and |
| gives the offset from the frame-pointer. This is required for targets |
| that produce debugging output for DBX or COFF-style debugging output |
| for SDB and allow the frame-pointer to be eliminated when the |
| <samp>-g</samp> options is used. |
| </p></dd></dl> |
| |
| <dl> |
| <dt><a name="index-DEBUGGER_005fARG_005fOFFSET"></a>Macro: <strong>DEBUGGER_ARG_OFFSET</strong> <em>(<var>offset</var>, <var>x</var>)</em></dt> |
| <dd><p>A C expression that returns the integer offset value for an argument |
| having address <var>x</var> (an RTL expression). The nominal offset is |
| <var>offset</var>. |
| </p></dd></dl> |
| |
| <dl> |
| <dt><a name="index-PREFERRED_005fDEBUGGING_005fTYPE"></a>Macro: <strong>PREFERRED_DEBUGGING_TYPE</strong></dt> |
| <dd><p>A C expression that returns the type of debugging output GCC should |
| produce when the user specifies just <samp>-g</samp>. Define |
| this if you have arranged for GCC to support more than one format of |
| debugging output. Currently, the allowable values are <code>DBX_DEBUG</code>, |
| <code>SDB_DEBUG</code>, <code>DWARF_DEBUG</code>, <code>DWARF2_DEBUG</code>, |
| <code>XCOFF_DEBUG</code>, <code>VMS_DEBUG</code>, and <code>VMS_AND_DWARF2_DEBUG</code>. |
| </p> |
| <p>When the user specifies <samp>-ggdb</samp>, GCC normally also uses the |
| value of this macro to select the debugging output format, but with two |
| exceptions. If <code>DWARF2_DEBUGGING_INFO</code> is defined, GCC uses the |
| value <code>DWARF2_DEBUG</code>. Otherwise, if <code>DBX_DEBUGGING_INFO</code> is |
| defined, GCC uses <code>DBX_DEBUG</code>. |
| </p> |
| <p>The value of this macro only affects the default debugging output; the |
| user can always get a specific type of output by using <samp>-gstabs</samp>, |
| <samp>-gcoff</samp>, <samp>-gdwarf-2</samp>, <samp>-gxcoff</samp>, or <samp>-gvms</samp>. |
| </p></dd></dl> |
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