作者存档：phpor

<div contenteditable="false" class="HighLighter"><div contenteditable="false" class="dp-highlighter"><div class="bar">&nbsp;</div><ol start="1" class="dp-cpp"><li class="alt"><span><span class="keyword">void</span><span>&nbsp;__cyg_profile_func_enter(&nbsp;</span><span class="keyword">void</span><span>&nbsp;*func_address,&nbsp;</span><span class="keyword">void</span><span>&nbsp;*call_site&nbsp;)</span></span></li><li class=""><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;__attribute__&nbsp;((no_instrument_function));</span></li><li class="alt"><span><span class="keyword">void</span><span>&nbsp;__cyg_profile_func_exit&nbsp;(&nbsp;</span><span class="keyword">void</span><span>&nbsp;*func_address,&nbsp;</span><span class="keyword">void</span><span>&nbsp;*call_site&nbsp;)</span></span></li><li class=""><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;__attribute__&nbsp;((no_instrument_function));</span></li></ol></div></div>这两个函数是GNU编译器给安排的，如果定了，则，在函数的入口和出口分别会调用； 当然，这个是在编译期决定的。运行期就无法指定了。<br /><br /><strong>可简单定义如下</strong>：<br /><div contenteditable="false" class="HighLighter"><div contenteditable="false" class="dp-highlighter"><div class="bar">&nbsp;</div><ol start="1" class="dp-cpp"><li class="alt"><span><span class="keyword">void</span><span>&nbsp;__cyg_profile_func_enter(&nbsp;</span><span class="keyword">void</span><span>&nbsp;*</span><span class="keyword">this</span><span>,&nbsp;</span><span class="keyword">void</span><span>&nbsp;*callsite&nbsp;)</span></span></li><li class=""><span>{</span></li><li class="alt"><span>&nbsp;&nbsp;<span class="comment">/*&nbsp;Function&nbsp;Entry&nbsp;Address&nbsp;*/</span><span></span></span></li><li class=""><span>&nbsp;&nbsp;fprintf(fp,&nbsp;<span class="string">&quot;E%p&#92;n&quot;</span><span>,&nbsp;(</span><span class="datatypes">int</span><span>&nbsp;*)</span><span class="keyword">this</span><span>);</span></span></li><li class="alt"><span>}</span></li><li class=""><span><span class="keyword">void</span><span>&nbsp;__cyg_profile_func_exit(&nbsp;</span><span class="keyword">void</span><span>&nbsp;*</span><span class="keyword">this</span><span>,&nbsp;</span><span class="keyword">void</span><span>&nbsp;*callsite&nbsp;)</span></span></li><li class="alt"><span>{</span></li><li class=""><span>&nbsp;&nbsp;<span class="comment">/*&nbsp;Function&nbsp;Exit&nbsp;Address&nbsp;*/</span><span></span></span></li><li class="alt"><span>&nbsp;&nbsp;fprintf(fp,&nbsp;<span class="string">&quot;X%p&#92;n&quot;</span><span>,&nbsp;(</span><span class="datatypes">int</span><span>&nbsp;*)</span><span class="keyword">this</span><span>);</span></span></li><li class=""><span>}</span></li></ol></div><div contenteditable="false" style="display:none" class="cpp"><pre>void __cyg_profile_func_enter( void *this, void *callsite ) {&nbsp;&nbsp; /* Function Entry Address */&nbsp;&nbsp; fprintf(fp, &quot;E%p&#92;n&quot;, (int *)this); } void __cyg_profile_func_exit( void *this, void *callsite ) {&nbsp;&nbsp; /* Function Exit Address */&nbsp;&nbsp; fprintf(fp, &quot;X%p&#92;n&quot;, (int *)this); }