172 lines
8.7 KiB
HTML
172 lines
8.7 KiB
HTML
|
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
|
||
|
|
<html>
|
||
|
|
<!-- Copyright (C) 1988-2016 Free Software Foundation, Inc.
|
||
|
|
|
||
|
|
Permission is granted to copy, distribute and/or modify this document
|
||
|
|
under the terms of the GNU Free Documentation License, Version 1.3 or
|
||
|
|
any later version published by the Free Software Foundation; with the
|
||
|
|
Invariant Sections being "Funding Free Software", the Front-Cover
|
||
|
|
Texts being (a) (see below), and with the Back-Cover Texts being (b)
|
||
|
|
(see below). A copy of the license is included in the section entitled
|
||
|
|
"GNU Free Documentation License".
|
||
|
|
|
||
|
|
(a) The FSF's Front-Cover Text is:
|
||
|
|
|
||
|
|
A GNU Manual
|
||
|
|
|
||
|
|
(b) The FSF's Back-Cover Text is:
|
||
|
|
|
||
|
|
You have freedom to copy and modify this GNU Manual, like GNU
|
||
|
|
software. Copies published by the Free Software Foundation raise
|
||
|
|
funds for GNU development. -->
|
||
|
|
<!-- Created by GNU Texinfo 5.2, http://www.gnu.org/software/texinfo/ -->
|
||
|
|
<head>
|
||
|
|
<title>GNU Compiler Collection (GCC) Internals: GIMPLE_DEBUG</title>
|
||
|
|
|
||
|
|
<meta name="description" content="GNU Compiler Collection (GCC) Internals: GIMPLE_DEBUG">
|
||
|
|
<meta name="keywords" content="GNU Compiler Collection (GCC) Internals: GIMPLE_DEBUG">
|
||
|
|
<meta name="resource-type" content="document">
|
||
|
|
<meta name="distribution" content="global">
|
||
|
|
<meta name="Generator" content="makeinfo">
|
||
|
|
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
|
||
|
|
<link href="index.html#Top" rel="start" title="Top">
|
||
|
|
<link href="Option-Index.html#Option-Index" rel="index" title="Option Index">
|
||
|
|
<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
|
||
|
|
<link href="Tuple-specific-accessors.html#Tuple-specific-accessors" rel="up" title="Tuple specific accessors">
|
||
|
|
<link href="GIMPLE_005fEH_005fFILTER.html#GIMPLE_005fEH_005fFILTER" rel="next" title="GIMPLE_EH_FILTER">
|
||
|
|
<link href="GIMPLE_005fCOND.html#GIMPLE_005fCOND" rel="prev" title="GIMPLE_COND">
|
||
|
|
<style type="text/css">
|
||
|
|
<!--
|
||
|
|
a.summary-letter {text-decoration: none}
|
||
|
|
blockquote.smallquotation {font-size: smaller}
|
||
|
|
div.display {margin-left: 3.2em}
|
||
|
|
div.example {margin-left: 3.2em}
|
||
|
|
div.indentedblock {margin-left: 3.2em}
|
||
|
|
div.lisp {margin-left: 3.2em}
|
||
|
|
div.smalldisplay {margin-left: 3.2em}
|
||
|
|
div.smallexample {margin-left: 3.2em}
|
||
|
|
div.smallindentedblock {margin-left: 3.2em; font-size: smaller}
|
||
|
|
div.smalllisp {margin-left: 3.2em}
|
||
|
|
kbd {font-style:oblique}
|
||
|
|
pre.display {font-family: inherit}
|
||
|
|
pre.format {font-family: inherit}
|
||
|
|
pre.menu-comment {font-family: serif}
|
||
|
|
pre.menu-preformatted {font-family: serif}
|
||
|
|
pre.smalldisplay {font-family: inherit; font-size: smaller}
|
||
|
|
pre.smallexample {font-size: smaller}
|
||
|
|
pre.smallformat {font-family: inherit; font-size: smaller}
|
||
|
|
pre.smalllisp {font-size: smaller}
|
||
|
|
span.nocodebreak {white-space:nowrap}
|
||
|
|
span.nolinebreak {white-space:nowrap}
|
||
|
|
span.roman {font-family:serif; font-weight:normal}
|
||
|
|
span.sansserif {font-family:sans-serif; font-weight:normal}
|
||
|
|
ul.no-bullet {list-style: none}
|
||
|
|
-->
|
||
|
|
</style>
|
||
|
|
|
||
|
|
|
||
|
|
</head>
|
||
|
|
|
||
|
|
<body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000">
|
||
|
|
<a name="GIMPLE_005fDEBUG"></a>
|
||
|
|
<div class="header">
|
||
|
|
<p>
|
||
|
|
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>
|
||
|
|
</div>
|
||
|
|
<hr>
|
||
|
|
<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>
|
||
|
|
|
||
|
|
<hr>
|
||
|
|
<div class="header">
|
||
|
|
<p>
|
||
|
|
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>
|
||
|
|
</div>
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
</body>
|
||
|
|
</html>
|