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198 lines
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HTML
198 lines
10 KiB
HTML
4 years ago
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<html>
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<!-- Copyright (C) 1988-2018 Free Software Foundation, Inc.
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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.3 or
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any later version published by the Free Software Foundation; with the
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Invariant Sections being "Funding Free Software", the Front-Cover
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Texts being (a) (see below), and with the Back-Cover Texts being (b)
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(see below). A copy of the license is included in the section entitled
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"GNU Free Documentation License".
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(a) The FSF's Front-Cover Text is:
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A GNU Manual
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(b) The FSF's Back-Cover Text is:
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You have freedom to copy and modify this GNU Manual, like GNU
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funds for GNU development. -->
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<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>GIMPLE_DEBUG (GNU Compiler Collection (GCC) Internals)</title>
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<meta name="description" content="GIMPLE_DEBUG (GNU Compiler Collection (GCC) Internals)">
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<meta name="keywords" content="GIMPLE_DEBUG (GNU Compiler Collection (GCC) Internals)">
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<meta name="resource-type" content="document">
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<meta name="distribution" content="global">
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<meta name="Generator" content="makeinfo">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<link href="index.html#Top" rel="start" title="Top">
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<link href="Option-Index.html#Option-Index" rel="index" title="Option Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="Tuple-specific-accessors.html#Tuple-specific-accessors" rel="up" title="Tuple specific accessors">
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<link href="GIMPLE_005fEH_005fFILTER.html#GIMPLE_005fEH_005fFILTER" rel="next" title="GIMPLE_EH_FILTER">
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<link href="GIMPLE_005fCOND.html#GIMPLE_005fCOND" rel="prev" title="GIMPLE_COND">
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</head>
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<body lang="en">
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<a name="GIMPLE_005fDEBUG"></a>
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<div class="header">
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<p>
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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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</div>
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<hr>
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<a name="GIMPLE_005fDEBUG-1"></a>
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<h4 class="subsection">12.8.7 <code>GIMPLE_DEBUG</code></h4>
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<a name="index-GIMPLE_005fDEBUG"></a>
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<a name="index-GIMPLE_005fDEBUG_005fBIND"></a>
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<a name="index-GIMPLE_005fDEBUG_005fBEGIN_005fSTMT"></a>
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<a name="index-GIMPLE_005fDEBUG_005fINLINE_005fENTRY"></a>
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<dl>
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<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>
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<dd><p>Build a <code>GIMPLE_DEBUG</code> statement with <code>GIMPLE_DEBUG_BIND</code>
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<code>subcode</code>. The effect of this statement is to tell debug
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information generation machinery that the value of user variable
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<code>var</code> is given by <code>value</code> at that point, and to remain with
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that value until <code>var</code> runs out of scope, a
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dynamically-subsequent debug bind statement overrides the binding, or
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conflicting values reach a control flow merge point. Even if
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components of the <code>value</code> expression change afterwards, the
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variable is supposed to retain the same value, though not necessarily
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the same location.
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</p>
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<p>It is expected that <code>var</code> be most often a tree for automatic user
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variables (<code>VAR_DECL</code> or <code>PARM_DECL</code>) that satisfy the
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requirements for gimple registers, but it may also be a tree for a
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scalarized component of a user variable (<code>ARRAY_REF</code>,
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<code>COMPONENT_REF</code>), or a debug temporary (<code>DEBUG_EXPR_DECL</code>).
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</p>
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<p>As for <code>value</code>, it can be an arbitrary tree expression, but it is
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recommended that it be in a suitable form for a gimple assignment
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<code>RHS</code>. It is not expected that user variables that could appear
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as <code>var</code> ever appear in <code>value</code>, because in the latter we’d
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have their <code>SSA_NAME</code>s instead, but even if they were not in SSA
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form, user variables appearing in <code>value</code> are to be regarded as
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part of the executable code space, whereas those in <code>var</code> are to
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be regarded as part of the source code space. There is no way to
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refer to the value bound to a user variable within a <code>value</code>
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expression.
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</p>
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<p>If <code>value</code> is <code>GIMPLE_DEBUG_BIND_NOVALUE</code>, debug information
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generation machinery is informed that the variable <code>var</code> is
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unbound, i.e., that its value is indeterminate, which sometimes means
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it is really unavailable, and other times that the compiler could not
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keep track of it.
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</p>
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<p>Block and location information for the newly-created stmt are
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taken from <code>stmt</code>, if given.
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</p></dd></dl>
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<dl>
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<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>
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<dd><p>Return the user variable <var>var</var> that is bound at <code>stmt</code>.
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</p></dd></dl>
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<dl>
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<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>
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<dd><p>Return the value expression that is bound to a user variable at
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<code>stmt</code>.
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</p></dd></dl>
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<dl>
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<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>
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<dd><p>Return a pointer to the value expression that is bound to a user
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variable at <code>stmt</code>.
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</p></dd></dl>
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<dl>
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<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>
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<dd><p>Modify the user variable bound at <code>stmt</code> to <var>var</var>.
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</p></dd></dl>
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<dl>
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<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>
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<dd><p>Modify the value bound to the user variable bound at <code>stmt</code> to
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<var>value</var>.
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</p></dd></dl>
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<dl>
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<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>
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<dd><p>Modify the value bound to the user variable bound at <code>stmt</code> so
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that the variable becomes unbound.
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</p></dd></dl>
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<dl>
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<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>
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<dd><p>Return <code>TRUE</code> if <code>stmt</code> binds a user variable to a value,
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and <code>FALSE</code> if it unbinds the variable.
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</p></dd></dl>
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<dl>
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<dt><a name="index-gimple_005fbuild_005fdebug_005fbegin_005fstmt"></a>GIMPLE function: <em>gimple</em> <strong>gimple_build_debug_begin_stmt</strong> <em>(tree block, location_t location)</em></dt>
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<dd><p>Build a <code>GIMPLE_DEBUG</code> statement with
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<code>GIMPLE_DEBUG_BEGIN_STMT</code> <code>subcode</code>. The effect of this
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statement is to tell debug information generation machinery that the
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user statement at the given <code>location</code> and <code>block</code> starts at
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the point at which the statement is inserted. The intent is that side
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effects (e.g. variable bindings) of all prior user statements are
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observable, and that none of the side effects of subsequent user
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statements are.
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</p></dd></dl>
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<dl>
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<dt><a name="index-gimple_005fbuild_005fdebug_005finline_005fentry"></a>GIMPLE function: <em>gimple</em> <strong>gimple_build_debug_inline_entry</strong> <em>(tree block, location_t location)</em></dt>
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<dd><p>Build a <code>GIMPLE_DEBUG</code> statement with
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<code>GIMPLE_DEBUG_INLINE_ENTRY</code> <code>subcode</code>. The effect of this
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statement is to tell debug information generation machinery that a
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function call at <code>location</code> underwent inline substitution, that
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<code>block</code> is the enclosing lexical block created for the
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substitution, and that at the point of the program in which the stmt is
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inserted, all parameters for the inlined function are bound to the
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respective arguments, and none of the side effects of its stmts are
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observable.
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</p></dd></dl>
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<hr>
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<div class="header">
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<p>
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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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</div>
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</body>
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