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<a name="SDB-and-DWARF"></a>
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<hr>
<a name="Macros-for-SDB-and-DWARF-Output"></a>
<h4 class="subsection">17.21.5 Macros for SDB and DWARF Output</h4>

<p>Here are macros for SDB and DWARF output.
</p>
<dl>
<dt><a name="index-SDB_005fDEBUGGING_005fINFO"></a>Macro: <strong>SDB_DEBUGGING_INFO</strong></dt>
<dd><p>Define this macro to 1 if GCC should produce COFF-style debugging output
for SDB in response to the <samp>-g</samp> option.
</p></dd></dl>

<dl>
<dt><a name="index-DWARF2_005fDEBUGGING_005fINFO"></a>Macro: <strong>DWARF2_DEBUGGING_INFO</strong></dt>
<dd><p>Define this macro if GCC should produce dwarf version 2 format
debugging output in response to the <samp>-g</samp> option.
</p>
<dl>
<dt><a name="index-TARGET_005fDWARF_005fCALLING_005fCONVENTION"></a>Target Hook: <em>int</em> <strong>TARGET_DWARF_CALLING_CONVENTION</strong> <em>(const_tree <var>function</var>)</em></dt>
<dd><p>Define this to enable the dwarf attribute <code>DW_AT_calling_convention</code> to
be emitted for each function.  Instead of an integer return the enum
value for the <code>DW_CC_</code> tag.
</p></dd></dl>

<p>To support optional call frame debugging information, you must also
define <code>INCOMING_RETURN_ADDR_RTX</code> and either set
<code>RTX_FRAME_RELATED_P</code> on the prologue insns if you use RTL for the
prologue, or call <code>dwarf2out_def_cfa</code> and <code>dwarf2out_reg_save</code>
as appropriate from <code>TARGET_ASM_FUNCTION_PROLOGUE</code> if you don&rsquo;t.
</p></dd></dl>

<dl>
<dt><a name="index-DWARF2_005fFRAME_005fINFO"></a>Macro: <strong>DWARF2_FRAME_INFO</strong></dt>
<dd><p>Define this macro to a nonzero value if GCC should always output
Dwarf 2 frame information.  If <code>TARGET_EXCEPT_UNWIND_INFO</code>
(see <a href="Exception-Region-Output.html#Exception-Region-Output">Exception Region Output</a>) returns <code>UI_DWARF2</code>, and
exceptions are enabled, GCC will output this information not matter
how you define <code>DWARF2_FRAME_INFO</code>.
</p></dd></dl>

<dl>
<dt><a name="index-TARGET_005fDEBUG_005fUNWIND_005fINFO"></a>Target Hook: <em>enum unwind_info_type</em> <strong>TARGET_DEBUG_UNWIND_INFO</strong> <em>(void)</em></dt>
<dd><p>This hook defines the mechanism that will be used for describing frame
unwind information to the debugger.  Normally the hook will return
<code>UI_DWARF2</code> if DWARF 2 debug information is enabled, and
return <code>UI_NONE</code> otherwise.
</p>
<p>A target may return <code>UI_DWARF2</code> even when DWARF 2 debug information
is disabled in order to always output DWARF 2 frame information.
</p>
<p>A target may return <code>UI_TARGET</code> if it has ABI specified unwind tables.
This will suppress generation of the normal debug frame unwind information.
</p></dd></dl>

<dl>
<dt><a name="index-DWARF2_005fASM_005fLINE_005fDEBUG_005fINFO"></a>Macro: <strong>DWARF2_ASM_LINE_DEBUG_INFO</strong></dt>
<dd><p>Define this macro to be a nonzero value if the assembler can generate Dwarf 2
line debug info sections.  This will result in much more compact line number
tables, and hence is desirable if it works.
</p></dd></dl>

<dl>
<dt><a name="index-TARGET_005fWANT_005fDEBUG_005fPUB_005fSECTIONS"></a>Target Hook: <em>bool</em> <strong>TARGET_WANT_DEBUG_PUB_SECTIONS</strong></dt>
<dd><p>True if the <code>.debug_pubtypes</code> and <code>.debug_pubnames</code> sections should be emitted.  These sections are not used on most platforms, and in particular GDB does not use them.
</p></dd></dl>

<dl>
<dt><a name="index-TARGET_005fDELAY_005fSCHED2"></a>Target Hook: <em>bool</em> <strong>TARGET_DELAY_SCHED2</strong></dt>
<dd><p>True if sched2 is not to be run at its normal place.
This usually means it will be run as part of machine-specific reorg.
</p></dd></dl>

<dl>
<dt><a name="index-TARGET_005fDELAY_005fVARTRACK"></a>Target Hook: <em>bool</em> <strong>TARGET_DELAY_VARTRACK</strong></dt>
<dd><p>True if vartrack is not to be run at its normal place.
This usually means it will be run as part of machine-specific reorg.
</p></dd></dl>

<dl>
<dt><a name="index-TARGET_005fNO_005fREGISTER_005fALLOCATION"></a>Target Hook: <em>bool</em> <strong>TARGET_NO_REGISTER_ALLOCATION</strong></dt>
<dd><p>True if register allocation and the passes
following it should not be run.  Usually true only for virtual assembler
targets.
</p></dd></dl>

<dl>
<dt><a name="index-ASM_005fOUTPUT_005fDWARF_005fDELTA"></a>Macro: <strong>ASM_OUTPUT_DWARF_DELTA</strong> <em>(<var>stream</var>, <var>size</var>, <var>label1</var>, <var>label2</var>)</em></dt>
<dd><p>A C statement to issue assembly directives that create a difference
<var>lab1</var> minus <var>lab2</var>, using an integer of the given <var>size</var>.
</p></dd></dl>

<dl>
<dt><a name="index-ASM_005fOUTPUT_005fDWARF_005fVMS_005fDELTA"></a>Macro: <strong>ASM_OUTPUT_DWARF_VMS_DELTA</strong> <em>(<var>stream</var>, <var>size</var>, <var>label1</var>, <var>label2</var>)</em></dt>
<dd><p>A C statement to issue assembly directives that create a difference
between the two given labels in system defined units, e.g. instruction
slots on IA64 VMS, using an integer of the given size.
</p></dd></dl>

<dl>
<dt><a name="index-ASM_005fOUTPUT_005fDWARF_005fOFFSET"></a>Macro: <strong>ASM_OUTPUT_DWARF_OFFSET</strong> <em>(<var>stream</var>, <var>size</var>, <var>label</var>, <var>offset</var>, <var>section</var>)</em></dt>
<dd><p>A C statement to issue assembly directives that create a
section-relative reference to the given <var>label</var> plus <var>offset</var>, using
an integer of the given <var>size</var>.  The label is known to be defined in the
given <var>section</var>.
</p></dd></dl>

<dl>
<dt><a name="index-ASM_005fOUTPUT_005fDWARF_005fPCREL"></a>Macro: <strong>ASM_OUTPUT_DWARF_PCREL</strong> <em>(<var>stream</var>, <var>size</var>, <var>label</var>)</em></dt>
<dd><p>A C statement to issue assembly directives that create a self-relative
reference to the given <var>label</var>, using an integer of the given <var>size</var>.
</p></dd></dl>

<dl>
<dt><a name="index-ASM_005fOUTPUT_005fDWARF_005fDATAREL"></a>Macro: <strong>ASM_OUTPUT_DWARF_DATAREL</strong> <em>(<var>stream</var>, <var>size</var>, <var>label</var>)</em></dt>
<dd><p>A C statement to issue assembly directives that create a reference to the
given <var>label</var> relative to the dbase, using an integer of the given <var>size</var>.
</p></dd></dl>

<dl>
<dt><a name="index-ASM_005fOUTPUT_005fDWARF_005fTABLE_005fREF"></a>Macro: <strong>ASM_OUTPUT_DWARF_TABLE_REF</strong> <em>(<var>label</var>)</em></dt>
<dd><p>A C statement to issue assembly directives that create a reference to
the DWARF table identifier <var>label</var> from the current section.  This
is used on some systems to avoid garbage collecting a DWARF table which
is referenced by a function.
</p></dd></dl>

<dl>
<dt><a name="index-TARGET_005fASM_005fOUTPUT_005fDWARF_005fDTPREL"></a>Target Hook: <em>void</em> <strong>TARGET_ASM_OUTPUT_DWARF_DTPREL</strong> <em>(FILE *<var>file</var>, int <var>size</var>, rtx <var>x</var>)</em></dt>
<dd><p>If defined, this target hook is a function which outputs a DTP-relative
reference to the given TLS symbol of the specified size.
</p></dd></dl>

<dl>
<dt><a name="index-PUT_005fSDB_005f"></a>Macro: <strong>PUT_SDB_</strong> <em>&hellip;</em></dt>
<dd><p>Define these macros to override the assembler syntax for the special
SDB assembler directives.  See <samp>sdbout.c</samp> for a list of these
macros and their arguments.  If the standard syntax is used, you need
not define them yourself.
</p></dd></dl>

<dl>
<dt><a name="index-SDB_005fDELIM"></a>Macro: <strong>SDB_DELIM</strong></dt>
<dd><p>Some assemblers do not support a semicolon as a delimiter, even between
SDB assembler directives.  In that case, define this macro to be the
delimiter to use (usually &lsquo;<samp>\n</samp>&rsquo;).  It is not necessary to define
a new set of <code>PUT_SDB_<var>op</var></code> macros if this is the only change
required.
</p></dd></dl>

<dl>
<dt><a name="index-SDB_005fALLOW_005fUNKNOWN_005fREFERENCES"></a>Macro: <strong>SDB_ALLOW_UNKNOWN_REFERENCES</strong></dt>
<dd><p>Define this macro to allow references to unknown structure,
union, or enumeration tags to be emitted.  Standard COFF does not
allow handling of unknown references, MIPS ECOFF has support for
it.
</p></dd></dl>

<dl>
<dt><a name="index-SDB_005fALLOW_005fFORWARD_005fREFERENCES"></a>Macro: <strong>SDB_ALLOW_FORWARD_REFERENCES</strong></dt>
<dd><p>Define this macro to allow references to structure, union, or
enumeration tags that have not yet been seen to be handled.  Some
assemblers choke if forward tags are used, while some require it.
</p></dd></dl>

<dl>
<dt><a name="index-SDB_005fOUTPUT_005fSOURCE_005fLINE"></a>Macro: <strong>SDB_OUTPUT_SOURCE_LINE</strong> <em>(<var>stream</var>, <var>line</var>)</em></dt>
<dd><p>A C statement to output SDB debugging information before code for line
number <var>line</var> of the current source file to the stdio stream
<var>stream</var>.  The default is to emit an <code>.ln</code> directive.
</p></dd></dl>

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