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  25. <title>Statement and operand traversals (GNU Compiler Collection (GCC) Internals)</title>

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  27. <meta name="description" content="Statement and operand traversals (GNU Compiler Collection (GCC) Internals)">

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  34. <link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">

  35. <link href="GIMPLE.html#GIMPLE" rel="up" title="GIMPLE">

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  70. <a name="Statement-and-operand-traversals"></a>

  71. <div class="header">

  72. <p>

  73. Previous: <a href="Adding-a-new-GIMPLE-statement-code.html#Adding-a-new-GIMPLE-statement-code" accesskey="p" rel="prev">Adding a new GIMPLE statement code</a>, Up: <a href="GIMPLE.html#GIMPLE" accesskey="u" rel="up">GIMPLE</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>

  74. </div>

  75. <hr>

  76. <a name="Statement-and-operand-traversals-1"></a>

  77. <h3 class="section">12.12 Statement and operand traversals</h3>

  78. <a name="index-Statement-and-operand-traversals"></a>

  79. 

  80. <p>There are two functions available for walking statements and

  81. sequences: <code>walk_gimple_stmt</code> and <code>walk_gimple_seq</code>,

  82. accordingly, and a third function for walking the operands in a

  83. statement: <code>walk_gimple_op</code>.

  84. </p>

  85. <dl>

  86. <dt><a name="index-walk_005fgimple_005fstmt"></a>GIMPLE function: <em>tree</em> <strong>walk_gimple_stmt</strong> <em>(gimple_stmt_iterator *gsi,   walk_stmt_fn callback_stmt, walk_tree_fn callback_op, struct walk_stmt_info *wi)</em></dt>

  87. <dd><p>This function is used to walk the current statement in <code>GSI</code>,

  88. optionally using traversal state stored in <code>WI</code>.  If <code>WI</code> is <code>NULL</code>, no

  89. state is kept during the traversal.

  90. </p>

  91. <p>The callback <code>CALLBACK_STMT</code> is called.  If <code>CALLBACK_STMT</code> returns

  92. true, it means that the callback function has handled all the

  93. operands of the statement and it is not necessary to walk its

  94. operands.

  95. </p>

  96. <p>If <code>CALLBACK_STMT</code> is <code>NULL</code> or it returns false, <code>CALLBACK_OP</code> is

  97. called on each operand of the statement via <code>walk_gimple_op</code>.  If

  98. <code>walk_gimple_op</code> returns non-<code>NULL</code> for any operand, the remaining

  99. operands are not scanned.

  100. </p>

  101. <p>The return value is that returned by the last call to

  102. <code>walk_gimple_op</code>, or <code>NULL_TREE</code> if no <code>CALLBACK_OP</code> is specified.

  103. </p></dd></dl>

  104. 

  105. 

  106. <dl>

  107. <dt><a name="index-walk_005fgimple_005fop"></a>GIMPLE function: <em>tree</em> <strong>walk_gimple_op</strong> <em>(gimple stmt,   walk_tree_fn callback_op, struct walk_stmt_info *wi)</em></dt>

  108. <dd><p>Use this function to walk the operands of statement <code>STMT</code>.  Every

  109. operand is walked via <code>walk_tree</code> with optional state information

  110. in <code>WI</code>.

  111. </p>

  112. <p><code>CALLBACK_OP</code> is called on each operand of <code>STMT</code> via <code>walk_tree</code>.

  113. Additional parameters to <code>walk_tree</code> must be stored in <code>WI</code>.  For

  114. each operand <code>OP</code>, <code>walk_tree</code> is called as:

  115. </p>

  116. <div class="smallexample">

  117. <pre class="smallexample">walk_tree (&amp;<code>OP</code>, <code>CALLBACK_OP</code>, <code>WI</code>, <code>PSET</code>)

  118. </pre></div>

  119. 

  120. <p>If <code>CALLBACK_OP</code> returns non-<code>NULL</code> for an operand, the remaining

  121. operands are not scanned.  The return value is that returned by

  122. the last call to <code>walk_tree</code>, or <code>NULL_TREE</code> if no <code>CALLBACK_OP</code> is

  123. specified.

  124. </p></dd></dl>

  125. 

  126. 

  127. <dl>

  128. <dt><a name="index-walk_005fgimple_005fseq"></a>GIMPLE function: <em>tree</em> <strong>walk_gimple_seq</strong> <em>(gimple_seq seq,   walk_stmt_fn callback_stmt, walk_tree_fn callback_op, struct walk_stmt_info *wi)</em></dt>

  129. <dd><p>This function walks all the statements in the sequence <code>SEQ</code>

  130. calling <code>walk_gimple_stmt</code> on each one.  <code>WI</code> is as in

  131. <code>walk_gimple_stmt</code>.  If <code>walk_gimple_stmt</code> returns non-<code>NULL</code>, the walk

  132. is stopped and the value returned.  Otherwise, all the statements

  133. are walked and <code>NULL_TREE</code> returned.

  134. </p></dd></dl>

  135. 

  136. 

  137. <hr>

  138. <div class="header">

  139. <p>

  140. Previous: <a href="Adding-a-new-GIMPLE-statement-code.html#Adding-a-new-GIMPLE-statement-code" accesskey="p" rel="prev">Adding a new GIMPLE statement code</a>, Up: <a href="GIMPLE.html#GIMPLE" accesskey="u" rel="up">GIMPLE</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>

  141. </div>

  142. 

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