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 <a name="Special-Accessors"></a>
 <div class="header">
 <p>
 Next: <a href="Flags.html#Flags" accesskey="n" rel="next">Flags</a>, Previous: <a href="Accessors.html#Accessors" accesskey="p" rel="prev">Accessors</a>, Up: <a href="RTL.html#RTL" accesskey="u" rel="up">RTL</a> &nbsp; [<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>
 </div>
 <hr>
 <a name="Access-to-Special-Operands"></a>
 <h3 class="section">13.4 Access to Special Operands</h3>
 <a name="index-access-to-special-operands"></a>

 <p>Some RTL nodes have special annotations associated with them.
 </p>
 <dl compact="compact">
 <dt><code>MEM</code></dt>
 <dd><dl compact="compact">
 <dd><a name="index-MEM_005fALIAS_005fSET"></a>
 </dd>
 <dt><code>MEM_ALIAS_SET (<var>x</var>)</code></dt>
 <dd><p>If 0, <var>x</var> is not in any alias set, and may alias anything.  Otherwise,
 <var>x</var> can only alias <code>MEM</code>s in a conflicting alias set.  This value
 is set in a language-dependent manner in the front-end, and should not be
 altered in the back-end.  In some front-ends, these numbers may correspond
 in some way to types, or other language-level entities, but they need not,
 and the back-end makes no such assumptions.
 These set numbers are tested with <code>alias_sets_conflict_p</code>.
 </p>
 <a name="index-MEM_005fEXPR"></a>
 </dd>
 <dt><code>MEM_EXPR (<var>x</var>)</code></dt>
 <dd><p>If this register is known to hold the value of some user-level
 declaration, this is that tree node.  It may also be a
 <code>COMPONENT_REF</code>, in which case this is some field reference,
 and <code>TREE_OPERAND (<var>x</var>, 0)</code> contains the declaration,
 or another <code>COMPONENT_REF</code>, or null if there is no compile-time
 object associated with the reference.
 </p>
 <a name="index-MEM_005fOFFSET_005fKNOWN_005fP"></a>
 </dd>
 <dt><code>MEM_OFFSET_KNOWN_P (<var>x</var>)</code></dt>
 <dd><p>True if the offset of the memory reference from <code>MEM_EXPR</code> is known.
 &lsquo;<samp>MEM_OFFSET (<var>x</var>)</samp>&rsquo; provides the offset if so.
 </p>
 <a name="index-MEM_005fOFFSET"></a>
 </dd>
 <dt><code>MEM_OFFSET (<var>x</var>)</code></dt>
 <dd><p>The offset from the start of <code>MEM_EXPR</code>.  The value is only valid if
 &lsquo;<samp>MEM_OFFSET_KNOWN_P (<var>x</var>)</samp>&rsquo; is true.
 </p>
 <a name="index-MEM_005fSIZE_005fKNOWN_005fP"></a>
 </dd>
 <dt><code>MEM_SIZE_KNOWN_P (<var>x</var>)</code></dt>
 <dd><p>True if the size of the memory reference is known.
 &lsquo;<samp>MEM_SIZE (<var>x</var>)</samp>&rsquo; provides its size if so.
 </p>
 <a name="index-MEM_005fSIZE"></a>
 </dd>
 <dt><code>MEM_SIZE (<var>x</var>)</code></dt>
 <dd><p>The size in bytes of the memory reference.
 This is mostly relevant for <code>BLKmode</code> references as otherwise
 the size is implied by the mode.  The value is only valid if
 &lsquo;<samp>MEM_SIZE_KNOWN_P (<var>x</var>)</samp>&rsquo; is true.
 </p>
 <a name="index-MEM_005fALIGN"></a>
 </dd>
 <dt><code>MEM_ALIGN (<var>x</var>)</code></dt>
 <dd><p>The known alignment in bits of the memory reference.
 </p>
 <a name="index-MEM_005fADDR_005fSPACE"></a>
 </dd>
 <dt><code>MEM_ADDR_SPACE (<var>x</var>)</code></dt>
 <dd><p>The address space of the memory reference.  This will commonly be zero
 for the generic address space.
 </p></dd>
 </dl>

 </dd>
 <dt><code>REG</code></dt>
 <dd><dl compact="compact">
 <dd><a name="index-ORIGINAL_005fREGNO"></a>
 </dd>
 <dt><code>ORIGINAL_REGNO (<var>x</var>)</code></dt>
 <dd><p>This field holds the number the register &ldquo;originally&rdquo; had; for a
 pseudo register turned into a hard reg this will hold the old pseudo
 register number.
 </p>
 <a name="index-REG_005fEXPR"></a>
 </dd>
 <dt><code>REG_EXPR (<var>x</var>)</code></dt>
 <dd><p>If this register is known to hold the value of some user-level
 declaration, this is that tree node.
 </p>
 <a name="index-REG_005fOFFSET"></a>
 </dd>
 <dt><code>REG_OFFSET (<var>x</var>)</code></dt>
 <dd><p>If this register is known to hold the value of some user-level
 declaration, this is the offset into that logical storage.
 </p></dd>
 </dl>

 </dd>
 <dt><code>SYMBOL_REF</code></dt>
 <dd><dl compact="compact">
 <dd><a name="index-SYMBOL_005fREF_005fDECL"></a>
 </dd>
 <dt><code>SYMBOL_REF_DECL (<var>x</var>)</code></dt>
 <dd><p>If the <code>symbol_ref</code> <var>x</var> was created for a <code>VAR_DECL</code> or
 a <code>FUNCTION_DECL</code>, that tree is recorded here.  If this value is
 null, then <var>x</var> was created by back end code generation routines,
 and there is no associated front end symbol table entry.
 </p>
 <p><code>SYMBOL_REF_DECL</code> may also point to a tree of class <code>'c'</code>,
 that is, some sort of constant.  In this case, the <code>symbol_ref</code>
 is an entry in the per-file constant pool; again, there is no associated
 front end symbol table entry.
 </p>
 <a name="index-SYMBOL_005fREF_005fCONSTANT"></a>
 </dd>
 <dt><code>SYMBOL_REF_CONSTANT (<var>x</var>)</code></dt>
 <dd><p>If &lsquo;<samp>CONSTANT_POOL_ADDRESS_P (<var>x</var>)</samp>&rsquo; is true, this is the constant
 pool entry for <var>x</var>.  It is null otherwise.
 </p>
 <a name="index-SYMBOL_005fREF_005fDATA"></a>
 </dd>
 <dt><code>SYMBOL_REF_DATA (<var>x</var>)</code></dt>
 <dd><p>A field of opaque type used to store <code>SYMBOL_REF_DECL</code> or
 <code>SYMBOL_REF_CONSTANT</code>.
 </p>
 <a name="index-SYMBOL_005fREF_005fFLAGS"></a>
 </dd>
 <dt><code>SYMBOL_REF_FLAGS (<var>x</var>)</code></dt>
 <dd><p>In a <code>symbol_ref</code>, this is used to communicate various predicates
 about the symbol.  Some of these are common enough to be computed by
 common code, some are specific to the target.  The common bits are:
 </p>
 <dl compact="compact">
 <dd><a name="index-SYMBOL_005fREF_005fFUNCTION_005fP"></a>
 <a name="index-SYMBOL_005fFLAG_005fFUNCTION"></a>
 </dd>
 <dt><code>SYMBOL_FLAG_FUNCTION</code></dt>
 <dd><p>Set if the symbol refers to a function.
 </p>
 <a name="index-SYMBOL_005fREF_005fLOCAL_005fP"></a>
 <a name="index-SYMBOL_005fFLAG_005fLOCAL"></a>
 </dd>
 <dt><code>SYMBOL_FLAG_LOCAL</code></dt>
 <dd><p>Set if the symbol is local to this &ldquo;module&rdquo;.
 See <code>TARGET_BINDS_LOCAL_P</code>.
 </p>
 <a name="index-SYMBOL_005fREF_005fEXTERNAL_005fP"></a>
 <a name="index-SYMBOL_005fFLAG_005fEXTERNAL"></a>
 </dd>
 <dt><code>SYMBOL_FLAG_EXTERNAL</code></dt>
 <dd><p>Set if this symbol is not defined in this translation unit.
 Note that this is not the inverse of <code>SYMBOL_FLAG_LOCAL</code>.
 </p>
 <a name="index-SYMBOL_005fREF_005fSMALL_005fP"></a>
 <a name="index-SYMBOL_005fFLAG_005fSMALL"></a>
 </dd>
 <dt><code>SYMBOL_FLAG_SMALL</code></dt>
 <dd><p>Set if the symbol is located in the small data section.
 See <code>TARGET_IN_SMALL_DATA_P</code>.
 </p>
 <a name="index-SYMBOL_005fFLAG_005fTLS_005fSHIFT"></a>
 <a name="index-SYMBOL_005fREF_005fTLS_005fMODEL"></a>
 </dd>
 <dt><code>SYMBOL_REF_TLS_MODEL (<var>x</var>)</code></dt>
 <dd><p>This is a multi-bit field accessor that returns the <code>tls_model</code>
 to be used for a thread-local storage symbol.  It returns zero for
 non-thread-local symbols.
 </p>
 <a name="index-SYMBOL_005fREF_005fHAS_005fBLOCK_005fINFO_005fP"></a>
 <a name="index-SYMBOL_005fFLAG_005fHAS_005fBLOCK_005fINFO"></a>
 </dd>
 <dt><code>SYMBOL_FLAG_HAS_BLOCK_INFO</code></dt>
 <dd><p>Set if the symbol has <code>SYMBOL_REF_BLOCK</code> and
 <code>SYMBOL_REF_BLOCK_OFFSET</code> fields.
 </p>
 <a name="index-SYMBOL_005fREF_005fANCHOR_005fP"></a>
 <a name="index-SYMBOL_005fFLAG_005fANCHOR"></a>
 <a name="index-_002dfsection_002danchors"></a>
 </dd>
 <dt><code>SYMBOL_FLAG_ANCHOR</code></dt>
 <dd><p>Set if the symbol is used as a section anchor.  &ldquo;Section anchors&rdquo;
 are symbols that have a known position within an <code>object_block</code>
 and that can be used to access nearby members of that block.
 They are used to implement <samp>-fsection-anchors</samp>.
 </p>
 <p>If this flag is set, then <code>SYMBOL_FLAG_HAS_BLOCK_INFO</code> will be too.
 </p></dd>
 </dl>

 <p>Bits beginning with <code>SYMBOL_FLAG_MACH_DEP</code> are available for
 the target&rsquo;s use.
 </p></dd>
 </dl>

 <a name="index-SYMBOL_005fREF_005fBLOCK"></a>
 </dd>
 <dt><code>SYMBOL_REF_BLOCK (<var>x</var>)</code></dt>
 <dd><p>If &lsquo;<samp>SYMBOL_REF_HAS_BLOCK_INFO_P (<var>x</var>)</samp>&rsquo;, this is the
 &lsquo;<samp>object_block</samp>&rsquo; structure to which the symbol belongs,
 or <code>NULL</code> if it has not been assigned a block.
 </p>
 <a name="index-SYMBOL_005fREF_005fBLOCK_005fOFFSET"></a>
 </dd>
 <dt><code>SYMBOL_REF_BLOCK_OFFSET (<var>x</var>)</code></dt>
 <dd><p>If &lsquo;<samp>SYMBOL_REF_HAS_BLOCK_INFO_P (<var>x</var>)</samp>&rsquo;, this is the offset of <var>x</var>
 from the first object in &lsquo;<samp>SYMBOL_REF_BLOCK (<var>x</var>)</samp>&rsquo;.  The value is
 negative if <var>x</var> has not yet been assigned to a block, or it has not
 been given an offset within that block.
 </p></dd>
 </dl>

 <hr>
 <div class="header">
 <p>
 Next: <a href="Flags.html#Flags" accesskey="n" rel="next">Flags</a>, Previous: <a href="Accessors.html#Accessors" accesskey="p" rel="prev">Accessors</a>, Up: <a href="RTL.html#RTL" accesskey="u" rel="up">RTL</a> &nbsp; [<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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	<body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000">
	<a name="Special-Accessors"></a>
	<div class="header">
	<p>
	Next: <a href="Flags.html#Flags" accesskey="n" rel="next">Flags</a>, Previous: <a href="Accessors.html#Accessors" accesskey="p" rel="prev">Accessors</a>, Up: <a href="RTL.html#RTL" accesskey="u" rel="up">RTL</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>
	</div>
	<hr>
	<a name="Access-to-Special-Operands"></a>
	<h3 class="section">13.4 Access to Special Operands</h3>
	<a name="index-access-to-special-operands"></a>

	<p>Some RTL nodes have special annotations associated with them.
	</p>
	<dl compact="compact">
	<dt><code>MEM</code></dt>
	<dd><dl compact="compact">
	<dd><a name="index-MEM_005fALIAS_005fSET"></a>
	</dd>
	<dt><code>MEM_ALIAS_SET (<var>x</var>)</code></dt>
	<dd><p>If 0, <var>x</var> is not in any alias set, and may alias anything. Otherwise,
	<var>x</var> can only alias <code>MEM</code>s in a conflicting alias set. This value
	is set in a language-dependent manner in the front-end, and should not be
	altered in the back-end. In some front-ends, these numbers may correspond
	in some way to types, or other language-level entities, but they need not,
	and the back-end makes no such assumptions.
	These set numbers are tested with <code>alias_sets_conflict_p</code>.
	</p>
	<a name="index-MEM_005fEXPR"></a>
	</dd>
	<dt><code>MEM_EXPR (<var>x</var>)</code></dt>
	<dd><p>If this register is known to hold the value of some user-level
	declaration, this is that tree node. It may also be a
	<code>COMPONENT_REF</code>, in which case this is some field reference,
	and <code>TREE_OPERAND (<var>x</var>, 0)</code> contains the declaration,
	or another <code>COMPONENT_REF</code>, or null if there is no compile-time
	object associated with the reference.
	</p>
	<a name="index-MEM_005fOFFSET_005fKNOWN_005fP"></a>
	</dd>
	<dt><code>MEM_OFFSET_KNOWN_P (<var>x</var>)</code></dt>
	<dd><p>True if the offset of the memory reference from <code>MEM_EXPR</code> is known.
	‘<samp>MEM_OFFSET (<var>x</var>)</samp>’ provides the offset if so.
	</p>
	<a name="index-MEM_005fOFFSET"></a>
	</dd>
	<dt><code>MEM_OFFSET (<var>x</var>)</code></dt>
	<dd><p>The offset from the start of <code>MEM_EXPR</code>. The value is only valid if
	‘<samp>MEM_OFFSET_KNOWN_P (<var>x</var>)</samp>’ is true.
	</p>
	<a name="index-MEM_005fSIZE_005fKNOWN_005fP"></a>
	</dd>
	<dt><code>MEM_SIZE_KNOWN_P (<var>x</var>)</code></dt>
	<dd><p>True if the size of the memory reference is known.
	‘<samp>MEM_SIZE (<var>x</var>)</samp>’ provides its size if so.
	</p>
	<a name="index-MEM_005fSIZE"></a>
	</dd>
	<dt><code>MEM_SIZE (<var>x</var>)</code></dt>
	<dd><p>The size in bytes of the memory reference.
	This is mostly relevant for <code>BLKmode</code> references as otherwise
	the size is implied by the mode. The value is only valid if
	‘<samp>MEM_SIZE_KNOWN_P (<var>x</var>)</samp>’ is true.
	</p>
	<a name="index-MEM_005fALIGN"></a>
	</dd>
	<dt><code>MEM_ALIGN (<var>x</var>)</code></dt>
	<dd><p>The known alignment in bits of the memory reference.
	</p>
	<a name="index-MEM_005fADDR_005fSPACE"></a>
	</dd>
	<dt><code>MEM_ADDR_SPACE (<var>x</var>)</code></dt>
	<dd><p>The address space of the memory reference. This will commonly be zero
	for the generic address space.
	</p></dd>
	</dl>

	</dd>
	<dt><code>REG</code></dt>
	<dd><dl compact="compact">
	<dd><a name="index-ORIGINAL_005fREGNO"></a>
	</dd>
	<dt><code>ORIGINAL_REGNO (<var>x</var>)</code></dt>
	<dd><p>This field holds the number the register “originally” had; for a
	pseudo register turned into a hard reg this will hold the old pseudo
	register number.
	</p>
	<a name="index-REG_005fEXPR"></a>
	</dd>
	<dt><code>REG_EXPR (<var>x</var>)</code></dt>
	<dd><p>If this register is known to hold the value of some user-level
	declaration, this is that tree node.
	</p>
	<a name="index-REG_005fOFFSET"></a>
	</dd>
	<dt><code>REG_OFFSET (<var>x</var>)</code></dt>
	<dd><p>If this register is known to hold the value of some user-level
	declaration, this is the offset into that logical storage.
	</p></dd>
	</dl>

	</dd>
	<dt><code>SYMBOL_REF</code></dt>
	<dd><dl compact="compact">
	<dd><a name="index-SYMBOL_005fREF_005fDECL"></a>
	</dd>
	<dt><code>SYMBOL_REF_DECL (<var>x</var>)</code></dt>
	<dd><p>If the <code>symbol_ref</code> <var>x</var> was created for a <code>VAR_DECL</code> or
	a <code>FUNCTION_DECL</code>, that tree is recorded here. If this value is
	null, then <var>x</var> was created by back end code generation routines,
	and there is no associated front end symbol table entry.
	</p>
	<p><code>SYMBOL_REF_DECL</code> may also point to a tree of class <code>'c'</code>,
	that is, some sort of constant. In this case, the <code>symbol_ref</code>
	is an entry in the per-file constant pool; again, there is no associated
	front end symbol table entry.
	</p>
	<a name="index-SYMBOL_005fREF_005fCONSTANT"></a>
	</dd>
	<dt><code>SYMBOL_REF_CONSTANT (<var>x</var>)</code></dt>
	<dd><p>If ‘<samp>CONSTANT_POOL_ADDRESS_P (<var>x</var>)</samp>’ is true, this is the constant
	pool entry for <var>x</var>. It is null otherwise.
	</p>
	<a name="index-SYMBOL_005fREF_005fDATA"></a>
	</dd>
	<dt><code>SYMBOL_REF_DATA (<var>x</var>)</code></dt>
	<dd><p>A field of opaque type used to store <code>SYMBOL_REF_DECL</code> or
	<code>SYMBOL_REF_CONSTANT</code>.
	</p>
	<a name="index-SYMBOL_005fREF_005fFLAGS"></a>
	</dd>
	<dt><code>SYMBOL_REF_FLAGS (<var>x</var>)</code></dt>
	<dd><p>In a <code>symbol_ref</code>, this is used to communicate various predicates
	about the symbol. Some of these are common enough to be computed by
	common code, some are specific to the target. The common bits are:
	</p>
	<dl compact="compact">
	<dd><a name="index-SYMBOL_005fREF_005fFUNCTION_005fP"></a>
	<a name="index-SYMBOL_005fFLAG_005fFUNCTION"></a>
	</dd>
	<dt><code>SYMBOL_FLAG_FUNCTION</code></dt>
	<dd><p>Set if the symbol refers to a function.
	</p>
	<a name="index-SYMBOL_005fREF_005fLOCAL_005fP"></a>
	<a name="index-SYMBOL_005fFLAG_005fLOCAL"></a>
	</dd>
	<dt><code>SYMBOL_FLAG_LOCAL</code></dt>
	<dd><p>Set if the symbol is local to this “module”.
	See <code>TARGET_BINDS_LOCAL_P</code>.
	</p>
	<a name="index-SYMBOL_005fREF_005fEXTERNAL_005fP"></a>
	<a name="index-SYMBOL_005fFLAG_005fEXTERNAL"></a>
	</dd>
	<dt><code>SYMBOL_FLAG_EXTERNAL</code></dt>
	<dd><p>Set if this symbol is not defined in this translation unit.
	Note that this is not the inverse of <code>SYMBOL_FLAG_LOCAL</code>.
	</p>
	<a name="index-SYMBOL_005fREF_005fSMALL_005fP"></a>
	<a name="index-SYMBOL_005fFLAG_005fSMALL"></a>
	</dd>
	<dt><code>SYMBOL_FLAG_SMALL</code></dt>
	<dd><p>Set if the symbol is located in the small data section.
	See <code>TARGET_IN_SMALL_DATA_P</code>.
	</p>
	<a name="index-SYMBOL_005fFLAG_005fTLS_005fSHIFT"></a>
	<a name="index-SYMBOL_005fREF_005fTLS_005fMODEL"></a>
	</dd>
	<dt><code>SYMBOL_REF_TLS_MODEL (<var>x</var>)</code></dt>
	<dd><p>This is a multi-bit field accessor that returns the <code>tls_model</code>
	to be used for a thread-local storage symbol. It returns zero for
	non-thread-local symbols.
	</p>
	<a name="index-SYMBOL_005fREF_005fHAS_005fBLOCK_005fINFO_005fP"></a>
	<a name="index-SYMBOL_005fFLAG_005fHAS_005fBLOCK_005fINFO"></a>
	</dd>
	<dt><code>SYMBOL_FLAG_HAS_BLOCK_INFO</code></dt>
	<dd><p>Set if the symbol has <code>SYMBOL_REF_BLOCK</code> and
	<code>SYMBOL_REF_BLOCK_OFFSET</code> fields.
	</p>
	<a name="index-SYMBOL_005fREF_005fANCHOR_005fP"></a>
	<a name="index-SYMBOL_005fFLAG_005fANCHOR"></a>
	<a name="index-_002dfsection_002danchors"></a>
	</dd>
	<dt><code>SYMBOL_FLAG_ANCHOR</code></dt>
	<dd><p>Set if the symbol is used as a section anchor. “Section anchors”
	are symbols that have a known position within an <code>object_block</code>
	and that can be used to access nearby members of that block.
	They are used to implement <samp>-fsection-anchors</samp>.
	</p>
	<p>If this flag is set, then <code>SYMBOL_FLAG_HAS_BLOCK_INFO</code> will be too.
	</p></dd>
	</dl>

	<p>Bits beginning with <code>SYMBOL_FLAG_MACH_DEP</code> are available for
	the target’s use.
	</p></dd>
	</dl>

	<a name="index-SYMBOL_005fREF_005fBLOCK"></a>
	</dd>
	<dt><code>SYMBOL_REF_BLOCK (<var>x</var>)</code></dt>
	<dd><p>If ‘<samp>SYMBOL_REF_HAS_BLOCK_INFO_P (<var>x</var>)</samp>’, this is the
	‘<samp>object_block</samp>’ structure to which the symbol belongs,
	or <code>NULL</code> if it has not been assigned a block.
	</p>
	<a name="index-SYMBOL_005fREF_005fBLOCK_005fOFFSET"></a>
	</dd>
	<dt><code>SYMBOL_REF_BLOCK_OFFSET (<var>x</var>)</code></dt>
	<dd><p>If ‘<samp>SYMBOL_REF_HAS_BLOCK_INFO_P (<var>x</var>)</samp>’, this is the offset of <var>x</var>
	from the first object in ‘<samp>SYMBOL_REF_BLOCK (<var>x</var>)</samp>’. The value is
	negative if <var>x</var> has not yet been assigned to a block, or it has not
	been given an offset within that block.
	</p></dd>
	</dl>

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