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<title>GNU Compiler Collection (GCC) Internals: SDB and DWARF</title>
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<a name="SDB-and-DWARF"></a>
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<p>
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Next: <a href="VMS-Debug.html#VMS-Debug" accesskey="n" rel="next">VMS Debug</a>, Previous: <a href="File-Names-and-DBX.html#File-Names-and-DBX" accesskey="p" rel="prev">File Names and DBX</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-for-SDB-and-DWARF-Output"></a>
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<h4 class="subsection">17.21.5 Macros for SDB and DWARF Output</h4>
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<p>Here are macros for SDB and DWARF output.
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</p>
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<dl>
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<dt><a name="index-SDB_005fDEBUGGING_005fINFO"></a>Macro: <strong>SDB_DEBUGGING_INFO</strong></dt>
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<dd><p>Define this macro to 1 if GCC should produce COFF-style debugging output
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for SDB in response to the <samp>-g</samp> option.
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</p></dd></dl>
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<dl>
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<dt><a name="index-DWARF2_005fDEBUGGING_005fINFO"></a>Macro: <strong>DWARF2_DEBUGGING_INFO</strong></dt>
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<dd><p>Define this macro if GCC should produce dwarf version 2 format
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debugging output in response to the <samp>-g</samp> option.
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</p>
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<dl>
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<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>
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<dd><p>Define this to enable the dwarf attribute <code>DW_AT_calling_convention</code> to
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be emitted for each function. Instead of an integer return the enum
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value for the <code>DW_CC_</code> tag.
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</p></dd></dl>
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<p>To support optional call frame debugging information, you must also
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define <code>INCOMING_RETURN_ADDR_RTX</code> and either set
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<code>RTX_FRAME_RELATED_P</code> on the prologue insns if you use RTL for the
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prologue, or call <code>dwarf2out_def_cfa</code> and <code>dwarf2out_reg_save</code>
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as appropriate from <code>TARGET_ASM_FUNCTION_PROLOGUE</code> if you don’t.
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</p></dd></dl>
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<dl>
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<dt><a name="index-DWARF2_005fFRAME_005fINFO"></a>Macro: <strong>DWARF2_FRAME_INFO</strong></dt>
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<dd><p>Define this macro to a nonzero value if GCC should always output
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Dwarf 2 frame information. If <code>TARGET_EXCEPT_UNWIND_INFO</code>
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(see <a href="Exception-Region-Output.html#Exception-Region-Output">Exception Region Output</a>) returns <code>UI_DWARF2</code>, and
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exceptions are enabled, GCC will output this information not matter
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how you define <code>DWARF2_FRAME_INFO</code>.
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</p></dd></dl>
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<dl>
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<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>
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<dd><p>This hook defines the mechanism that will be used for describing frame
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unwind information to the debugger. Normally the hook will return
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<code>UI_DWARF2</code> if DWARF 2 debug information is enabled, and
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return <code>UI_NONE</code> otherwise.
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</p>
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<p>A target may return <code>UI_DWARF2</code> even when DWARF 2 debug information
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is disabled in order to always output DWARF 2 frame information.
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</p>
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<p>A target may return <code>UI_TARGET</code> if it has ABI specified unwind tables.
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This will suppress generation of the normal debug frame unwind information.
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</p></dd></dl>
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<dl>
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<dt><a name="index-DWARF2_005fASM_005fLINE_005fDEBUG_005fINFO"></a>Macro: <strong>DWARF2_ASM_LINE_DEBUG_INFO</strong></dt>
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<dd><p>Define this macro to be a nonzero value if the assembler can generate Dwarf 2
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line debug info sections. This will result in much more compact line number
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tables, and hence is desirable if it works.
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</p></dd></dl>
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<dl>
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<dt><a name="index-TARGET_005fWANT_005fDEBUG_005fPUB_005fSECTIONS"></a>Target Hook: <em>bool</em> <strong>TARGET_WANT_DEBUG_PUB_SECTIONS</strong></dt>
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<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.
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</p></dd></dl>
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<dl>
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<dt><a name="index-TARGET_005fFORCE_005fAT_005fCOMP_005fDIR"></a>Target Hook: <em>bool</em> <strong>TARGET_FORCE_AT_COMP_DIR</strong></dt>
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<dd><p>True if the <code>DW_AT_comp_dir</code> attribute should be emitted for each compilation unit. This attribute is required for the darwin linker to emit debug information.
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</p></dd></dl>
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<dl>
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<dt><a name="index-TARGET_005fDELAY_005fSCHED2"></a>Target Hook: <em>bool</em> <strong>TARGET_DELAY_SCHED2</strong></dt>
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<dd><p>True if sched2 is not to be run at its normal place.
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This usually means it will be run as part of machine-specific reorg.
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</p></dd></dl>
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<dl>
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<dt><a name="index-TARGET_005fDELAY_005fVARTRACK"></a>Target Hook: <em>bool</em> <strong>TARGET_DELAY_VARTRACK</strong></dt>
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<dd><p>True if vartrack is not to be run at its normal place.
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This usually means it will be run as part of machine-specific reorg.
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</p></dd></dl>
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<dl>
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<dt><a name="index-TARGET_005fNO_005fREGISTER_005fALLOCATION"></a>Target Hook: <em>bool</em> <strong>TARGET_NO_REGISTER_ALLOCATION</strong></dt>
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<dd><p>True if register allocation and the passes
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following it should not be run. Usually true only for virtual assembler
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targets.
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</p></dd></dl>
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<dl>
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<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>
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<dd><p>A C statement to issue assembly directives that create a difference
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<var>lab1</var> minus <var>lab2</var>, using an integer of the given <var>size</var>.
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</p></dd></dl>
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<dl>
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<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>
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<dd><p>A C statement to issue assembly directives that create a difference
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between the two given labels in system defined units, e.g. instruction
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slots on IA64 VMS, using an integer of the given size.
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</p></dd></dl>
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<dl>
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<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>section</var>)</em></dt>
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<dd><p>A C statement to issue assembly directives that create a
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section-relative reference to the given <var>label</var>, using an integer of the
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given <var>size</var>. The label is known to be defined in the given <var>section</var>.
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</p></dd></dl>
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<dl>
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<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>
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<dd><p>A C statement to issue assembly directives that create a self-relative
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reference to the given <var>label</var>, using an integer of the given <var>size</var>.
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</p></dd></dl>
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<dl>
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<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>
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<dd><p>A C statement to issue assembly directives that create a reference to the
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given <var>label</var> relative to the dbase, using an integer of the given <var>size</var>.
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</p></dd></dl>
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<dl>
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<dt><a name="index-ASM_005fOUTPUT_005fDWARF_005fTABLE_005fREF"></a>Macro: <strong>ASM_OUTPUT_DWARF_TABLE_REF</strong> <em>(<var>label</var>)</em></dt>
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<dd><p>A C statement to issue assembly directives that create a reference to
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the DWARF table identifier <var>label</var> from the current section. This
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is used on some systems to avoid garbage collecting a DWARF table which
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is referenced by a function.
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</p></dd></dl>
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<dl>
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<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>
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<dd><p>If defined, this target hook is a function which outputs a DTP-relative
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reference to the given TLS symbol of the specified size.
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</p></dd></dl>
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<dl>
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<dt><a name="index-PUT_005fSDB_005f"></a>Macro: <strong>PUT_SDB_</strong> <em>…</em></dt>
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<dd><p>Define these macros to override the assembler syntax for the special
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SDB assembler directives. See <samp>sdbout.c</samp> for a list of these
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macros and their arguments. If the standard syntax is used, you need
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not define them yourself.
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</p></dd></dl>
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<dl>
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<dt><a name="index-SDB_005fDELIM"></a>Macro: <strong>SDB_DELIM</strong></dt>
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<dd><p>Some assemblers do not support a semicolon as a delimiter, even between
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SDB assembler directives. In that case, define this macro to be the
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delimiter to use (usually ‘<samp>\n</samp>’). It is not necessary to define
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a new set of <code>PUT_SDB_<var>op</var></code> macros if this is the only change
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required.
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</p></dd></dl>
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<dl>
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<dt><a name="index-SDB_005fALLOW_005fUNKNOWN_005fREFERENCES"></a>Macro: <strong>SDB_ALLOW_UNKNOWN_REFERENCES</strong></dt>
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<dd><p>Define this macro to allow references to unknown structure,
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union, or enumeration tags to be emitted. Standard COFF does not
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allow handling of unknown references, MIPS ECOFF has support for
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it.
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</p></dd></dl>
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<dl>
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<dt><a name="index-SDB_005fALLOW_005fFORWARD_005fREFERENCES"></a>Macro: <strong>SDB_ALLOW_FORWARD_REFERENCES</strong></dt>
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<dd><p>Define this macro to allow references to structure, union, or
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enumeration tags that have not yet been seen to be handled. Some
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assemblers choke if forward tags are used, while some require it.
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</p></dd></dl>
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<dl>
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<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>
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<dd><p>A C statement to output SDB debugging information before code for line
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number <var>line</var> of the current source file to the stdio stream
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<var>stream</var>. The default is to emit an <code>.ln</code> directive.
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</p></dd></dl>
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