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  25. <title>Profiling (GNU Compiler Collection (GCC) Internals)</title>

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  70. <a name="Profiling"></a>

  71. <div class="header">

  72. <p>

  73. Next: <a href="Tail-Calls.html#Tail-Calls" accesskey="n" rel="next">Tail Calls</a>, Previous: <a href="Function-Entry.html#Function-Entry" accesskey="p" rel="prev">Function Entry</a>, Up: <a href="Stack-and-Calling.html#Stack-and-Calling" accesskey="u" rel="up">Stack and Calling</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="Generating-Code-for-Profiling"></a>

  77. <h4 class="subsection">18.9.12 Generating Code for Profiling</h4>

  78. <a name="index-profiling_002c-code-generation"></a>

  79. 

  80. <p>These macros will help you generate code for profiling.

  81. </p>

  82. <dl>

  83. <dt><a name="index-FUNCTION_005fPROFILER"></a>Macro: <strong>FUNCTION_PROFILER</strong> <em>(<var>file</var>, <var>labelno</var>)</em></dt>

  84. <dd><p>A C statement or compound statement to output to <var>file</var> some

  85. assembler code to call the profiling subroutine <code>mcount</code>.

  86. </p>

  87. <a name="index-mcount"></a>

  88. <p>The details of how <code>mcount</code> expects to be called are determined by

  89. your operating system environment, not by GCC.  To figure them out,

  90. compile a small program for profiling using the system&rsquo;s installed C

  91. compiler and look at the assembler code that results.

  92. </p>

  93. <p>Older implementations of <code>mcount</code> expect the address of a counter

  94. variable to be loaded into some register.  The name of this variable is

  95. &lsquo;<samp>LP</samp>&rsquo; followed by the number <var>labelno</var>, so you would generate

  96. the name using &lsquo;<samp>LP%d</samp>&rsquo; in a <code>fprintf</code>.

  97. </p></dd></dl>

  98. 

  99. <dl>

  100. <dt><a name="index-PROFILE_005fHOOK"></a>Macro: <strong>PROFILE_HOOK</strong></dt>

  101. <dd><p>A C statement or compound statement to output to <var>file</var> some assembly

  102. code to call the profiling subroutine <code>mcount</code> even the target does

  103. not support profiling.

  104. </p></dd></dl>

  105. 

  106. <dl>

  107. <dt><a name="index-NO_005fPROFILE_005fCOUNTERS"></a>Macro: <strong>NO_PROFILE_COUNTERS</strong></dt>

  108. <dd><p>Define this macro to be an expression with a nonzero value if the

  109. <code>mcount</code> subroutine on your system does not need a counter variable

  110. allocated for each function.  This is true for almost all modern

  111. implementations.  If you define this macro, you must not use the

  112. <var>labelno</var> argument to <code>FUNCTION_PROFILER</code>.

  113. </p></dd></dl>

  114. 

  115. <dl>

  116. <dt><a name="index-PROFILE_005fBEFORE_005fPROLOGUE"></a>Macro: <strong>PROFILE_BEFORE_PROLOGUE</strong></dt>

  117. <dd><p>Define this macro if the code for function profiling should come before

  118. the function prologue.  Normally, the profiling code comes after.

  119. </p></dd></dl>

  120. 

  121. <dl>

  122. <dt><a name="index-TARGET_005fKEEP_005fLEAF_005fWHEN_005fPROFILED"></a>Target Hook: <em>bool</em> <strong>TARGET_KEEP_LEAF_WHEN_PROFILED</strong> <em>(void)</em></dt>

  123. <dd><p>This target hook returns true if the target wants the leaf flag for the current function to stay true even if it calls mcount.  This might make sense for targets using the leaf flag only to determine whether a stack frame needs to be generated or not and for which the call to mcount is generated before the function prologue.

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

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  130. </div>

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