[analyzer] Update alpha and potential checker documentation, esp. alpha.valist

Summary:
Move alpha.valist from potential to alpha since it was implemented in D15227

Cleanup some HTML comments, add a missing link

Reviewers: jordan_rose, zaks.anna

Subscribers: cfe-commits, xazax.hun

Differential Revision: https://reviews.llvm.org/D25663

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@284445 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 78 insertions, 65 deletions

diff --git a/www/analyzer/alpha_checks.html b/www/analyzer/alpha_checks.html
index 6f5e4f1708..0312d16ace 100644
--- a/www/analyzer/alpha_checks.html
+++ b/www/analyzer/alpha_checks.html
@@ -26,13 +26,14 @@ Patches welcome!
 <ul>
 <li><a href="#core_alpha_checkers">Core Alpha Checkers</a></li>
 <li><a href="#cplusplus_alpha_checkers">C++ Alpha Checkers</a></li>
+<li><a href="#valist_alpha_checkers">Variable Argument Alpha Checkers</a></li>
 <li><a href="#deadcode_alpha_checkers">Dead Code Alpha Checkers</a></li>
 <li><a href="#osx_alpha_checkers">OS X Alpha Checkers</a></li>
 <li><a href="#security_alpha_checkers">Security Alpha Checkers</a></li>
 <li><a href="#unix_alpha_checkers">Unix Alpha Checkers</a></li>
 </ul>
 
-<!------------------------------ core alpha ----------------------------------->
+<!-- ============================= core alpha ============================= -->
 <h3 id="core_alpha_checkers">Core Alpha Checkers</h3>
 <table class="checkers">
 <colgroup><col class="namedescr"><col class="example"></colgroup>
@@ -179,7 +180,7 @@ int test(struct s *p) {
 
 </tbody></table>
 
-<!--------------------------- cplusplus alpha --------------------------------->
+<!-- =========================== cplusplus alpha =========================== -->
 <h3 id="cplusplus_alpha_checkers">C++ Alpha Checkers</h3>
 <table class="checkers">
 <colgroup><col class="namedescr"><col class="example"></colgroup>
@@ -226,7 +227,76 @@ public:
 
 </tbody></table>
 
-<!--------------------------- dead code alpha --------------------------------->
+
+
+<!-- =============================== va_list =============================== -->
+<h3 id="valist_alpha_checkers">Variable Argument Alpha Checkers</h3>
+<table class="checkers">
+<colgroup><col class="namedescr"><col class="example"></colgroup>
+<thead><tr><td>Name, Description</td><td>Example</td></tr></thead>
+
+<tbody>
+<tr><td><div class="namedescr expandable"><span class="name">
+alpha.valist.CopyToSelf</span><span class="lang">
+(C)</span><div class="descr">
+Calls to the <code>va_copy</code> macro should not copy onto itself.</div></div></td>
+<td><div class="exampleContainer expandable">
+<div class="example"><pre>
+#include &lt;stdarg.h&gt;
+
+void test(int x, ...) {
+  va_list args;
+  va_start(args, x);
+  va_copy(args, args); // warn
+  va_end(args);
+}
+</pre></div></div></td></tr>
+
+<tr><td><div class="namedescr expandable"><span class="name">
+alpha.valist.Uninitialized</span><span class="lang">
+(C)</span><div class="descr">
+Calls to the <code>va_arg</code>, <code>va_copy</code>, or
+<code>va_end</code> macro must happen after calling <code>va_start</code> and
+before calling <code>va_end</code>.</div></div></td>
+<td><div class="exampleContainer expandable">
+<div class="example"><pre>
+#include &lt;stdarg.h&gt;
+
+void test(int x, ...) {
+  va_list args;
+  int y = va_arg(args, int); // warn
+}
+</pre></div>
+<div class="example"><pre>
+#include &lt;stdarg.h&gt;
+
+void test(int x, ...) {
+  va_list args;
+  va_start(args, x);
+  va_end(args);
+  int z = va_arg(args, int); // warn
+}
+</pre></div></div></td></tr>
+
+<tr><td><div class="namedescr expandable"><span class="name">
+alpha.valist.Unterminated</span><span class="lang">
+(C)</span><div class="descr">
+Every <code>va_start</code> must be matched by a <code>va_end</code>. A va_list
+can only be ended once.</div></div></td>
+<td><div class="exampleContainer expandable">
+<div class="example"><pre>
+#include &lt;stdarg.h&gt;
+
+void test(int x, ...) {
+  va_list args;
+  va_start(args, x);
+  int y = x + va_arg(args, int);
+} // warn: missing va_end
+</pre></div></div></td></tr>
+
+</tbody></table>
+
+<!-- =========================== dead code alpha =========================== -->
 <h3 id="deadcode_alpha_checkers">Dead Code Alpha Checkers</h3>
 <table class="checkers">
 <colgroup><col class="namedescr"><col class="example"></colgroup>
@@ -267,7 +337,7 @@ void test(id x) {
 </pre></div></div></td></tr>
 </tbody></table>
 
-<!---------------------------- OS X alpha -------------------------------------->
+<!-- ============================== OS X alpha ============================== -->
 <h3 id="osx_alpha_checkers">OS X Alpha Checkers</h3>
 <table class="checkers">
 <colgroup><col class="namedescr"><col class="example"></colgroup>
@@ -433,7 +503,7 @@ invalidatable instance variables.</div></div></td>
 
 </tbody></table>
 
-<!------------------------- security alpha ------------------------------------>
+<!-- =========================== security alpha =========================== -->
 <h3 id="security_alpha_checkers">Security Alpha Checkers</h3>
 <table class="checkers">
 <colgroup><col class="namedescr"><col class="example"></colgroup>
@@ -584,7 +654,7 @@ void test() {
 
 </tbody></table>
 
-<!--------------------------- unix alpha -------------------------------------->
+<!-- ============================= unix alpha ============================= -->
 <h3 id="unix_alpha_checkers">Unix Alpha Checkers</h3>
 <table class="checkers">
 <colgroup><col class="namedescr"><col class="example"></colgroup>
diff --git a/www/analyzer/potential_checkers.html b/www/analyzer/potential_checkers.html
index 0e5fba3e02..2e6a201d79 100644
--- a/www/analyzer/potential_checkers.html
+++ b/www/analyzer/potential_checkers.html
@@ -180,64 +180,6 @@ void test(A *dst, A *src) {
 
 </table>
 
-<!-- =============================== va_list =============================== -->
-<h3>va_list</h3>
-<table class="checkers">
-<col class="namedescr"><col class="example"><col class="progress">
-<thead><tr><td>Name, Description</td><td>Example</td><td>Progress</td></tr></thead>
-
-<tr><td><div class="namedescr expandable"><span class="name">
-valist.Uninitialized</span><span class="lang">
-(C)</span><div class="descr">
-Calls to the <code>va_arg</code>, <code>va_copy</code>, or
-<code>va_end</code> macro must happen after calling <code>va_start</code> and
-before calling <code>va_end</code>.</div></div></td>
-<td><div class="exampleContainer expandable">
-<div class="example"><pre>
-#include &lt;stdarg.h&gt;
-
-void test(int x, ...) {
-  va_list args;
-  int y = va_arg(args, int); // warn
-}
-</pre></div>
-<div class="example"><pre>
-#include &lt;stdarg.h&gt;
-
-void test(int x, ...) {
-  va_list args;
-  va_start(args, x); 
-  va_end(args);
-  int z = va_arg(args, int); // warn
-}
-</pre></div></div></td>
-<td class="aligned"><a href="http://llvm.org/bugs/show_bug.cgi?id=16812">
-PR16811</a></td></tr>
-
-<tr><td><div class="namedescr expandable"><span class="name">
-valist.Unterminated</span><span class="lang">
-(C)</span><div class="descr">
-Every <code>va_start</code> must be matched by a <code>va_end</code>. A va_list
-can only be ended once.
-
-<i>This should be folded into the generalized "ownership checker"
-described on the <a href="open_projects.html">
-Open Projects</a> page.</i></div></div></td>
-<td><div class="exampleContainer expandable">
-<div class="example"><pre>
-#include &lt;stdarg.h&gt;
-
-void test(int x, ...) {
-  va_list args;
-  va_start(args, x);
-  int y = x + va_arg(args, int);
-} // warn: missing va_end
-</pre></div></div></td>
-<td class="aligned"><a href="http://llvm.org/bugs/show_bug.cgi?id=16812">
-PR16812</a></td></tr>
-
-</table>
-
 <!-- ============================== exceptions ============================= -->
 <h3>exceptions</h3>
 <table class="checkers">
@@ -384,7 +326,8 @@ void test() {
    // warn: the right operand to '-' is always 0
 }
 </pre></div></div></td>
-<td class="aligned">removed from alpha.deadcode.* at r198476</td></tr>
+<td class="aligned">removed from alpha.deadcode.* at
+<a href="https://reviews.llvm.org/rL198476">r198476</a></td></tr>
 
 </table>