void type is also a valid function return type.

[oota-llvm.git] / docs / WritingAnLLVMPass.html

diff --git a/docs/WritingAnLLVMPass.html b/docs/WritingAnLLVMPass.html
index aae0dec6b1a0a3ea8a5775bef428a638cba91de4..07e736da691e55ae8a2aa1325e72dc0c9e2205f1 100644 (file)
--- a/docs/WritingAnLLVMPass.html
+++ b/docs/WritingAnLLVMPass.html
@@ -292,13 +292,19 @@ function.</p>
 initialization value is not important.</p>
 
 <div class="doc_code"><pre>
-  RegisterPass&lt;Hello&gt; X("<i>hello</i>", "<i>Hello World Pass</i>");
+  RegisterPass&lt;Hello&gt; X("<i>hello</i>", "<i>Hello World Pass</i>",
+                        false /* Only looks at CFG */,
+                        false /* Analysis Pass */);
 }  <i>// end of anonymous namespace</i>
 </pre></div>
 
 <p>Lastly, we <a href="#registration">register our class</a> <tt>Hello</tt>, 
 giving it a command line
-argument "<tt>hello</tt>", and a name "<tt>Hello World Pass</tt>".</p>
+argument "<tt>hello</tt>", and a name "<tt>Hello World Pass</tt>".
+Last two RegisterPass arguments are optional. Their default value is false.
+If a pass walks CFG without modifying it then third argument is set to true. 
+If  a pass is an analysis pass, for example dominator tree pass, then true 
+is supplied as fourth argument. </p>
 
 <p>As a whole, the <tt>.cpp</tt> file looks like:</p>
 
@@ -1376,7 +1382,8 @@ the LLVM program representation for a single function at a time, instead of
 traversing the entire program.  It reduces the memory consumption of compiler,
 because, for example, only one <a
 href="http://llvm.org/doxygen/classllvm_1_1DominatorSet.html"><tt>DominatorSet</tt></a>
-needs to be calculated at a time.  This also makes it possible some <a
+needs to be calculated at a time.  This also makes it possible to implement
+some <a
 href="#SMP">interesting enhancements</a> in the future.</p></li>
 
 </ol>