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+<title>GNU Compiler Collection (GCC) Internals: Debug Information</title>
+
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+<a name="Debug-Information"></a>
+<div class="header">
+<p>
+Next: <a href="Insns.html#Insns" accesskey="n" rel="next">Insns</a>, Previous: <a href="Assembler.html#Assembler" accesskey="p" rel="previous">Assembler</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="Variable-Location-Debug-Information-in-RTL"></a>
+<h3 class="section">14.18 Variable Location Debug Information in RTL</h3>
+<a name="index-Variable-Location-Debug-Information-in-RTL"></a>
+
+<p>Variable tracking relies on <code>MEM_EXPR</code> and <code>REG_EXPR</code>
+annotations to determine what user variables memory and register
+references refer to.
+</p>
+<p>Variable tracking at assignments uses these notes only when they refer
+to variables that live at fixed locations (e.g., addressable
+variables, global non-automatic variables).  For variables whose
+location may vary, it relies on the following types of notes.
+</p>
+<dl compact="compact">
+<dd><a name="index-var_005flocation"></a>
+</dd>
+<dt><code>(var_location:<var>mode</var> <var>var</var> <var>exp</var> <var>stat</var>)</code></dt>
+<dd><p>Binds variable <code>var</code>, a tree, to value <var>exp</var>, an RTL
+expression.  It appears only in <code>NOTE_INSN_VAR_LOCATION</code> and
+<code>DEBUG_INSN</code>s, with slightly different meanings.  <var>mode</var>, if
+present, represents the mode of <var>exp</var>, which is useful if it is a
+modeless expression.  <var>stat</var> is only meaningful in notes,
+indicating whether the variable is known to be initialized or
+uninitialized.
+</p>
+<a name="index-debug_005fexpr"></a>
+</dd>
+<dt><code>(debug_expr:<var>mode</var> <var>decl</var>)</code></dt>
+<dd><p>Stands for the value bound to the <code>DEBUG_EXPR_DECL</code> <var>decl</var>,
+that points back to it, within value expressions in
+<code>VAR_LOCATION</code> nodes.
+</p>
+<a name="index-debug_005fimplicit_005fptr"></a>
+</dd>
+<dt><code>(debug_implicit_ptr:<var>mode</var> <var>decl</var>)</code></dt>
+<dd><p>Stands for the location of a <var>decl</var> that is no longer addressable.
+</p>
+<a name="index-entry_005fvalue"></a>
+</dd>
+<dt><code>(entry_value:<var>mode</var> <var>decl</var>)</code></dt>
+<dd><p>Stands for the value a <var>decl</var> had at the entry point of the
+containing function.
+</p>
+<a name="index-debug_005fparameter_005fref"></a>
+</dd>
+<dt><code>(debug_parameter_ref:<var>mode</var> <var>decl</var>)</code></dt>
+<dd><p>Refers to a parameter that was completely optimized out.
+</p>
+<a name="index-debug_005fmarker"></a>
+</dd>
+<dt><code>(debug_marker:<var>mode</var>)</code></dt>
+<dd><p>Marks a program location.  With <code>VOIDmode</code>, it stands for the
+beginning of a statement, a recommended inspection point logically after
+all prior side effects, and before any subsequent side effects.  With
+<code>BLKmode</code>, it indicates an inline entry point: the lexical block
+encoded in the <code>INSN_LOCATION</code> is the enclosing block that encloses
+the inlined function.
+</p>
+</dd>
+</dl>
+
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