commit e50fb9ac174b791047ffa8648443ab94b2097cd9
author Devang Patel <dpatel@apple.com> Tue May 01 20:55:38 2007 +0000
committer Devang Patel <dpatel@apple.com> Tue May 01 20:55:38 2007 +0000
tree bc346d7fa504f489a1f459862ad1c611be52091b
parent 1b201684333c501e2f47178e1a4df68cd894c49d

Update doc to reflect changes I am about to install to fix PR 888.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@36631 91177308-0d34-0410-b5e6-96231b3b80d8

docs/WritingAnLLVMPass.html

diff --git a/docs/WritingAnLLVMPass.html b/docs/WritingAnLLVMPass.html
index 8f2c7af..13849d0 100644
--- a/docs/WritingAnLLVMPass.html
+++ b/docs/WritingAnLLVMPass.html
@@ -263,6 +263,14 @@
 time.</p>
 
 <div class="doc_code"><pre>
+     static const int ID;
+     Hello() : FunctionPass((intptr_t)&ID) {}
+</pre></div><p>
+
+<p> This declares pass identifier used by LLVM to identify pass. This allows LLVM to
+avoid using expensive C++ runtime information.</p>
+
+<div class="doc_code"><pre>
     <b>virtual bool</b> <a href="#runOnFunction">runOnFunction</a>(Function &amp;F) {
       llvm::cerr &lt;&lt; "<i>Hello: </i>" &lt;&lt; F.getName() &lt;&lt; "\n";
       <b>return false</b>;
@@ -277,6 +285,13 @@
 function.</p>
 
 <div class="doc_code"><pre>
+  const int Hello::ID = 0;
+</pre></div>
+
+<p> We initialize pass ID here. LLVM uses ID's address to identify pass so 
+initialization value is not important.</p>
+
+<div class="doc_code"><pre>
   RegisterPass&lt;Hello&gt; X("<i>hello</i>", "<i>Hello World Pass</i>");
 }  <i>// end of anonymous namespace</i>
 </pre></div>
@@ -295,6 +310,10 @@
 
 <b>namespace</b> {
   <b>struct Hello</b> : <b>public</b> <a href="#FunctionPass">FunctionPass</a> {
+    
+    static const int ID;
+    Hello() : FunctionPass((intptr_t)&ID) {}
+
     <b>virtual bool</b> <a href="#runOnFunction">runOnFunction</a>(Function &amp;F) {
       llvm::cerr &lt;&lt; "<i>Hello: </i>" &lt;&lt; F.getName() &lt;&lt; "\n";
       <b>return false</b>;