Start a "hacking" page with some simple notes on getting started
developing clang.
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+ <title>Hacking on clang</title>
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+ <!--*********************************************************************-->
+ <h1>Hacking on Clang</h1>
+ <!--*********************************************************************-->
+
+ <p>This document provides some hints for how to get started hacking
+ on Clang for developers who are new to the Clang and/or LLVM
+ codebases.
+ <ul>
+ <li><a href="#docs">Developer Documentation</a></li>
+ <li><a href="#debugging">Debugging</a></li>
+ <li><a href="#irgen">LLVM IR Generation</a></li>
+ </ul>
+ </p>
+
+ <!--=====================================================================-->
+ <h2 id="debugging">Developer Documentation</h2>
+ <!--=====================================================================-->
+
+ <p>Both Clang and LLVM use doxygen to provide API documentation. Their
+ respective web pages (generated nightly) are here:
+ <ul>
+ <li><a href="http://clang.llvm.org/doxygen">Clang</a></li>
+ <li><a href="http://llvm.org/doxygen">LLVM</a></li>
+ </ul>
+ </p>
+
+ <p>For work on the LLVM IR generation, the LLVM assembly language
+ <a href="http://llvm.org/docs/LangRef.html">reference manual</a> is
+ also useful.</p>
+
+ <!--=====================================================================-->
+ <h2 id="debugging">Debugging</h2>
+ <!--=====================================================================-->
+
+ <p>Inspecting data structures in a debugger:
+ <ul>
+ <li>Many LLVM and Clang data structures provide
+ a <tt>dump()</tt> method which will print a description of the
+ data structure to <tt>stderr</tt>.</li>
+ <li>The <a href="docs/InternalsManual.html#QualType"><tt>QualType</tt></a>
+ structure is used pervasively. This is a simple value class for
+ wrapping types with qualifiers; you can use
+ the <tt>isConstQualified()</tt>, for example, to get one of the
+ qualifiers, and the <tt>getTypePtr()</tt> method to get the
+ wrapped <tt>Type*</tt> which you can then dump.</li>
+ </ul>
+ </p>
+
+ <!--=====================================================================-->
+ <h2 id="irgen">LLVM IR Generation</h2>
+ <!--=====================================================================-->
+
+ <p>The LLVM IR generation part of clang handles conversion of the
+ AST nodes output by the Sema module to the LLVM Intermediate
+ Representation (IR). Historically, this was referred to as
+ "codegen", and the Clang code for this lives
+ in <tt>lib/CodeGen</tt>.</p>
+
+ <p>The output is most easily inspected using the <tt>-emit-llvm</tt>
+ option to clang (possibly in conjunction with <tt>-o -</tt>). You
+ can also use <tt>-emit-llvm-bc</tt> to write an LLVM bitcode file
+ which can be processed by the suite of LLVM tools
+ like <tt>llvm-dis</tt>, <tt>llvm-nm</tt>, etc. See the LLVM
+ <a href="http://llvm.org/docs/CommandGuide/">Command Guide</tt>
+ for more information.</p>
+
+</div>
+</body>
+</html>