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<p class="MsoNormal"><span style="color:#1F497D">You are describing "function inlining" which is an optimization done by LLVM. This optimization is performed on the intermediate representation (IR), not at the source level, if that's what you need to know.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">--paulr<o:p></o:p></span></p>
<p class="MsoNormal"><a name="_MailEndCompose"><span style="color:#1F497D"><o:p> </o:p></span></a></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> cfe-dev [mailto:cfe-dev-bounces@lists.llvm.org]
<b>On Behalf Of </b>Yonggang Chen via cfe-dev<br>
<b>Sent:</b> Thursday, June 22, 2017 9:03 PM<br>
<b>To:</b> cfe-dev@lists.llvm.org<br>
<b>Subject:</b> [cfe-dev] how to replace function call with actual code of function body?<br>
<b>Importance:</b> High<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas;color:#0D0D0D;mso-fareast-language:ZH-CN">Hello all,<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas;color:#0D0D0D;mso-fareast-language:ZH-CN"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas;color:#0D0D0D;background:silver;mso-highlight:silver;mso-fareast-language:ZH-CN">int main()<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas;color:#0D0D0D;background:silver;mso-highlight:silver;mso-fareast-language:ZH-CN">{<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas;color:#0D0D0D;background:silver;mso-highlight:silver;mso-fareast-language:ZH-CN"> auto n = 9;<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas;color:#0D0D0D;background:silver;mso-highlight:silver;mso-fareast-language:ZH-CN"> auto x = cacul(n);<o:p></o:p></span></p>
<p class="MsoNormal" style="text-indent:21.0pt;text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas;color:#0D0D0D;background:silver;mso-highlight:silver;mso-fareast-language:ZH-CN">return 0;<br>
</span><span style="font-size:10.5pt;color:#0D0D0D;background:silver;mso-highlight:silver;mso-fareast-language:ZH-CN">}</span><span style="font-size:10.5pt;color:#0D0D0D;mso-fareast-language:ZH-CN"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.5pt;color:#0D0D0D;mso-fareast-language:ZH-CN"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.5pt;color:#0D0D0D;background:silver;mso-highlight:silver;mso-fareast-language:ZH-CN">int cacul(int x)<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.5pt;color:#0D0D0D;background:silver;mso-highlight:silver;mso-fareast-language:ZH-CN">{<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.5pt;color:#0D0D0D;background:silver;mso-highlight:silver;mso-fareast-language:ZH-CN"> return x * x + 3;<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.5pt;color:#0D0D0D;background:silver;mso-highlight:silver;mso-fareast-language:ZH-CN">}</span><span style="font-size:10.5pt;color:#0D0D0D;mso-fareast-language:ZH-CN"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas;color:#0D0D0D;mso-fareast-language:ZH-CN"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas;color:#0D0D0D;mso-fareast-language:ZH-CN">Suppose I have function
<span style="background:silver;mso-highlight:silver">main()</span>, in which <span style="background:silver;mso-highlight:silver">
cacul(int x)</span> is called.<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas;color:#0D0D0D;mso-fareast-language:ZH-CN">Now I want Clang help me do this:<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas;color:#0D0D0D;mso-fareast-language:ZH-CN"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas;color:#0D0D0D;background:silver;mso-highlight:silver;mso-fareast-language:ZH-CN">int main()<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas;color:#0D0D0D;background:silver;mso-highlight:silver;mso-fareast-language:ZH-CN">{<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas;color:#0D0D0D;background:silver;mso-highlight:silver;mso-fareast-language:ZH-CN"> auto n = 9;<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas;color:#0D0D0D;background:silver;mso-highlight:silver;mso-fareast-language:ZH-CN"> auto x = n * n + 3;<o:p></o:p></span></p>
<p class="MsoNormal" style="text-indent:21.0pt;text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas;color:#0D0D0D;background:silver;mso-highlight:silver;mso-fareast-language:ZH-CN">return 0;<br>
</span><span style="font-size:10.5pt;color:#0D0D0D;background:silver;mso-highlight:silver;mso-fareast-language:ZH-CN">}<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.5pt;color:#0D0D0D;background:silver;mso-highlight:silver;mso-fareast-language:ZH-CN"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.5pt;color:#0D0D0D;background:silver;mso-highlight:silver;mso-fareast-language:ZH-CN">int cacul(int x)<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.5pt;color:#0D0D0D;background:silver;mso-highlight:silver;mso-fareast-language:ZH-CN">{<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.5pt;color:#0D0D0D;background:silver;mso-highlight:silver;mso-fareast-language:ZH-CN"> return x * x + 3;<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.5pt;color:#0D0D0D;background:silver;mso-highlight:silver;mso-fareast-language:ZH-CN">}</span><span style="font-size:10.5pt;color:#0D0D0D;mso-fareast-language:ZH-CN"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas;color:#0D0D0D;mso-fareast-language:ZH-CN"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas;color:#0D0D0D;mso-fareast-language:ZH-CN">That’s to say, remove reference to
<span style="background:silver;mso-highlight:silver">cacul</span>. Can Clang help me do that? If so, how to do it?<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.5pt;color:#0D0D0D;mso-fareast-language:ZH-CN"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.5pt;color:#0D0D0D;mso-fareast-language:ZH-CN">Best regards<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.5pt;color:#0D0D0D;mso-fareast-language:ZH-CN">Yonggang Chen</span><span style="font-size:9.5pt;font-family:Consolas;color:#0D0D0D;mso-fareast-language:ZH-CN"><o:p></o:p></span></p>
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