150 lines
7.1 KiB
HTML
150 lines
7.1 KiB
HTML
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<!-- Created by GNU Texinfo 5.2, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>GNU Compiler Collection (GCC) Internals: All Debuggers</title>
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<meta name="description" content="GNU Compiler Collection (GCC) Internals: All Debuggers">
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<meta name="keywords" content="GNU Compiler Collection (GCC) Internals: All Debuggers">
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<link href="index.html#Top" rel="start" title="Top">
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<link href="Option-Index.html#Option-Index" rel="index" title="Option Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="Debugging-Info.html#Debugging-Info" rel="up" title="Debugging Info">
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<link href="DBX-Options.html#DBX-Options" rel="next" title="DBX Options">
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</head>
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<body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000">
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<a name="All-Debuggers"></a>
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<div class="header">
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<p>
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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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</div>
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<hr>
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<a name="Macros-Affecting-All-Debugging-Formats"></a>
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<h4 class="subsection">17.21.1 Macros Affecting All Debugging Formats</h4>
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<p>These macros affect all debugging formats.
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</p>
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<dl>
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<dt><a name="index-DBX_005fREGISTER_005fNUMBER"></a>Macro: <strong>DBX_REGISTER_NUMBER</strong> <em>(<var>regno</var>)</em></dt>
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<dd><p>A C expression that returns the DBX register number for the compiler
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register number <var>regno</var>. In the default macro provided, the value
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of this expression will be <var>regno</var> itself. But sometimes there are
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some registers that the compiler knows about and DBX does not, or vice
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versa. In such cases, some register may need to have one number in the
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compiler and another for DBX.
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</p>
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<p>If two registers have consecutive numbers inside GCC, and they can be
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used as a pair to hold a multiword value, then they <em>must</em> have
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consecutive numbers after renumbering with <code>DBX_REGISTER_NUMBER</code>.
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Otherwise, debuggers will be unable to access such a pair, because they
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expect register pairs to be consecutive in their own numbering scheme.
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</p>
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<p>If you find yourself defining <code>DBX_REGISTER_NUMBER</code> in way that
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does not preserve register pairs, then what you must do instead is
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redefine the actual register numbering scheme.
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</p></dd></dl>
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<dl>
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<dt><a name="index-DEBUGGER_005fAUTO_005fOFFSET"></a>Macro: <strong>DEBUGGER_AUTO_OFFSET</strong> <em>(<var>x</var>)</em></dt>
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<dd><p>A C expression that returns the integer offset value for an automatic
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variable having address <var>x</var> (an RTL expression). The default
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computation assumes that <var>x</var> is based on the frame-pointer and
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gives the offset from the frame-pointer. This is required for targets
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that produce debugging output for DBX or COFF-style debugging output
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for SDB and allow the frame-pointer to be eliminated when the
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<samp>-g</samp> options is used.
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</p></dd></dl>
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<dl>
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<dt><a name="index-DEBUGGER_005fARG_005fOFFSET"></a>Macro: <strong>DEBUGGER_ARG_OFFSET</strong> <em>(<var>offset</var>, <var>x</var>)</em></dt>
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<dd><p>A C expression that returns the integer offset value for an argument
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having address <var>x</var> (an RTL expression). The nominal offset is
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<var>offset</var>.
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</p></dd></dl>
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<dl>
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<dt><a name="index-PREFERRED_005fDEBUGGING_005fTYPE"></a>Macro: <strong>PREFERRED_DEBUGGING_TYPE</strong></dt>
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<dd><p>A C expression that returns the type of debugging output GCC should
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produce when the user specifies just <samp>-g</samp>. Define
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this if you have arranged for GCC to support more than one format of
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debugging output. Currently, the allowable values are <code>DBX_DEBUG</code>,
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<code>SDB_DEBUG</code>, <code>DWARF_DEBUG</code>, <code>DWARF2_DEBUG</code>,
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<code>XCOFF_DEBUG</code>, <code>VMS_DEBUG</code>, and <code>VMS_AND_DWARF2_DEBUG</code>.
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</p>
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<p>When the user specifies <samp>-ggdb</samp>, GCC normally also uses the
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value of this macro to select the debugging output format, but with two
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exceptions. If <code>DWARF2_DEBUGGING_INFO</code> is defined, GCC uses the
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value <code>DWARF2_DEBUG</code>. Otherwise, if <code>DBX_DEBUGGING_INFO</code> is
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defined, GCC uses <code>DBX_DEBUG</code>.
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</p>
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<p>The value of this macro only affects the default debugging output; the
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user can always get a specific type of output by using <samp>-gstabs</samp>,
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<samp>-gcoff</samp>, <samp>-gdwarf-2</samp>, <samp>-gxcoff</samp>, or <samp>-gvms</samp>.
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</p></dd></dl>
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<hr>
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<div class="header">
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<p>
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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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</div>
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</body>
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