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add and document regex support for FileCheck. You can now do stuff like:

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; CHECK: movl {{%e[a-z][xi]}}, %eax

or whatever.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@82717 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2009-09-24 21:47:32 +00:00
parent fe03dbeaa3
commit 528700863a
5 changed files with 162 additions and 16 deletions
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docs/TestingGuide.html
+34
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@@ -624,6 +624,40 @@ define i8 @coerce_offset0(i32 %V, i32* %P) {
</div>
<!-- _______________________________________________________________________ -->
<div class="doc_subsubsection"><a
name="FileCheck-Matching">FileCheck Pattern Matting Syntax</a></div>
<div class="doc_text">
<p>The CHECK: and CHECK-NOT: directives both take a pattern to match. For most
uses of FileCheck, fixed string matching is perfectly sufficient. For some
things, a more flexible form of matching is desired. To support this, FileCheck
allows you to specify regular expressions in matching strings, surrounded by
double braces: <b>{{yourregex}}</b>. Because we want to use fixed string
matching for a majority of what we do, FileCheck has been designed to support
mixing and matching fixed string matching with regular expressions. This allows
you to write things like this:</p>
<div class="doc_code">
<pre>
; CHECK: movhpd <b>{{[0-9]+}}</b>(%esp), <b>{{%xmm[0-7]}}</b>
</pre>
</div>
<p>In this case, any offset from the ESP register will be allowed, and any xmm
register will be allowed.</p>
<p>Because regular expressions are enclosed with double braces, they are
visually distinct, and you don't need to use escape characters within the double
braces like you would in C. In the rare case that you want to match double
braces explicitly from the input, you can use something ugly like
<b>{{[{][{]}}</b> as your pattern.</p>
</div>
<!-- _______________________________________________________________________ -->
<div class="doc_subsection"><a name="dgvars">Variables and
substitutions</a></div>