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| <a name="GIMPLE_005fDEBUG-1"></a> |
| <h4 class="subsection">11.8.7 <code>GIMPLE_DEBUG</code></h4> |
| <a name="index-GIMPLE_005fDEBUG"></a> |
| <a name="index-GIMPLE_005fDEBUG_005fBIND"></a> |
| |
| <dl> |
| <dt><a name="index-_002agimple_005fbuild_005fdebug_005fbind"></a>GIMPLE function: <em>gdebug</em> <strong>*gimple_build_debug_bind</strong> <em>(tree var, tree value, gimple stmt)</em></dt> |
| <dd><p>Build a <code>GIMPLE_DEBUG</code> statement with <code>GIMPLE_DEBUG_BIND</code> of |
| <code>subcode</code>. The effect of this statement is to tell debug |
| information generation machinery that the value of user variable |
| <code>var</code> is given by <code>value</code> at that point, and to remain with |
| that value until <code>var</code> runs out of scope, a |
| dynamically-subsequent debug bind statement overrides the binding, or |
| conflicting values reach a control flow merge point. Even if |
| components of the <code>value</code> expression change afterwards, the |
| variable is supposed to retain the same value, though not necessarily |
| the same location. |
| </p> |
| <p>It is expected that <code>var</code> be most often a tree for automatic user |
| variables (<code>VAR_DECL</code> or <code>PARM_DECL</code>) that satisfy the |
| requirements for gimple registers, but it may also be a tree for a |
| scalarized component of a user variable (<code>ARRAY_REF</code>, |
| <code>COMPONENT_REF</code>), or a debug temporary (<code>DEBUG_EXPR_DECL</code>). |
| </p> |
| <p>As for <code>value</code>, it can be an arbitrary tree expression, but it is |
| recommended that it be in a suitable form for a gimple assignment |
| <code>RHS</code>. It is not expected that user variables that could appear |
| as <code>var</code> ever appear in <code>value</code>, because in the latter we’d |
| have their <code>SSA_NAME</code>s instead, but even if they were not in SSA |
| form, user variables appearing in <code>value</code> are to be regarded as |
| part of the executable code space, whereas those in <code>var</code> are to |
| be regarded as part of the source code space. There is no way to |
| refer to the value bound to a user variable within a <code>value</code> |
| expression. |
| </p> |
| <p>If <code>value</code> is <code>GIMPLE_DEBUG_BIND_NOVALUE</code>, debug information |
| generation machinery is informed that the variable <code>var</code> is |
| unbound, i.e., that its value is indeterminate, which sometimes means |
| it is really unavailable, and other times that the compiler could not |
| keep track of it. |
| </p> |
| <p>Block and location information for the newly-created stmt are |
| taken from <code>stmt</code>, if given. |
| </p></dd></dl> |
| |
| <dl> |
| <dt><a name="index-gimple_005fdebug_005fbind_005fget_005fvar"></a>GIMPLE function: <em>tree</em> <strong>gimple_debug_bind_get_var</strong> <em>(gimple stmt)</em></dt> |
| <dd><p>Return the user variable <var>var</var> that is bound at <code>stmt</code>. |
| </p></dd></dl> |
| |
| <dl> |
| <dt><a name="index-gimple_005fdebug_005fbind_005fget_005fvalue"></a>GIMPLE function: <em>tree</em> <strong>gimple_debug_bind_get_value</strong> <em>(gimple stmt)</em></dt> |
| <dd><p>Return the value expression that is bound to a user variable at |
| <code>stmt</code>. |
| </p></dd></dl> |
| |
| <dl> |
| <dt><a name="index-gimple_005fdebug_005fbind_005fget_005fvalue_005fptr"></a>GIMPLE function: <em>tree *</em> <strong>gimple_debug_bind_get_value_ptr</strong> <em>(gimple stmt)</em></dt> |
| <dd><p>Return a pointer to the value expression that is bound to a user |
| variable at <code>stmt</code>. |
| </p></dd></dl> |
| |
| <dl> |
| <dt><a name="index-gimple_005fdebug_005fbind_005fset_005fvar"></a>GIMPLE function: <em>void</em> <strong>gimple_debug_bind_set_var</strong> <em>(gimple stmt, tree var)</em></dt> |
| <dd><p>Modify the user variable bound at <code>stmt</code> to <var>var</var>. |
| </p></dd></dl> |
| |
| <dl> |
| <dt><a name="index-gimple_005fdebug_005fbind_005fset_005fvalue"></a>GIMPLE function: <em>void</em> <strong>gimple_debug_bind_set_value</strong> <em>(gimple stmt, tree var)</em></dt> |
| <dd><p>Modify the value bound to the user variable bound at <code>stmt</code> to |
| <var>value</var>. |
| </p></dd></dl> |
| |
| <dl> |
| <dt><a name="index-gimple_005fdebug_005fbind_005freset_005fvalue"></a>GIMPLE function: <em>void</em> <strong>gimple_debug_bind_reset_value</strong> <em>(gimple stmt)</em></dt> |
| <dd><p>Modify the value bound to the user variable bound at <code>stmt</code> so |
| that the variable becomes unbound. |
| </p></dd></dl> |
| |
| <dl> |
| <dt><a name="index-gimple_005fdebug_005fbind_005fhas_005fvalue_005fp"></a>GIMPLE function: <em>bool</em> <strong>gimple_debug_bind_has_value_p</strong> <em>(gimple stmt)</em></dt> |
| <dd><p>Return <code>TRUE</code> if <code>stmt</code> binds a user variable to a value, |
| and <code>FALSE</code> if it unbinds the variable. |
| </p></dd></dl> |
| |
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| Next: <a href="GIMPLE_005fEH_005fFILTER.html#GIMPLE_005fEH_005fFILTER" accesskey="n" rel="next"><code>GIMPLE_EH_FILTER</code></a>, Previous: <a href="GIMPLE_005fCOND.html#GIMPLE_005fCOND" accesskey="p" rel="prev"><code>GIMPLE_COND</code></a>, Up: <a href="Tuple-specific-accessors.html#Tuple-specific-accessors" accesskey="u" rel="up">Tuple specific accessors</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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