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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@145521 91177308-0d34-0410-b5e6-96231b3b80d8
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Bill Wendling 2011-11-30 21:43:43 +00:00
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@ -2889,20 +2889,33 @@ call void asm sideeffect "something bad", ""()<b>, !srcloc !42</b>
preceding exclamation point ('<tt>!</tt>').</p>
<p>A metadata string is a string surrounded by double quotes. It can contain
any character by escaping non-printable characters with "\xx" where "xx" is
the two digit hex code. For example: "<tt>!"test\00"</tt>".</p>
any character by escaping non-printable characters with "<tt>\xx</tt>" where
"<tt>xx</tt>" is the two digit hex code. For example:
"<tt>!"test\00"</tt>".</p>
<p>Metadata nodes are represented with notation similar to structure constants
(a comma separated list of elements, surrounded by braces and preceded by an
exclamation point). For example: "<tt>!{ metadata !"test\00", i32
10}</tt>". Metadata nodes can have any values as their operand.</p>
exclamation point). Metadata nodes can have any values as their operand. For
example:</p>
<div class="doc_code">
<pre>
!{ metadata !"test\00", i32 10}
</pre>
</div>
<p>A <a href="#namedmetadatastructure">named metadata</a> is a collection of
metadata nodes, which can be looked up in the module symbol table. For
example: "<tt>!foo = metadata !{!4, !3}</tt>".
example:</p>
<div class="doc_code">
<pre>
!foo = metadata !{!4, !3}
</pre>
</div>
<p>Metadata can be used as function arguments. Here <tt>llvm.dbg.value</tt>
function is using two metadata arguments.</p>
function is using two metadata arguments:</p>
<div class="doc_code">
<pre>
@ -2911,7 +2924,8 @@ call void @llvm.dbg.value(metadata !24, i64 0, metadata !25)
</div>
<p>Metadata can be attached with an instruction. Here metadata <tt>!21</tt> is
attached with <tt>add</tt> instruction using <tt>!dbg</tt> identifier.</p>
attached to the <tt>add</tt> instruction using the <tt>!dbg</tt>
identifier:</p>
<div class="doc_code">
<pre>
@ -2922,6 +2936,7 @@ call void @llvm.dbg.value(metadata !24, i64 0, metadata !25)
<p>More information about specific metadata nodes recognized by the optimizers
and code generator is found below.</p>
<!-- _______________________________________________________________________ -->
<h4>
<a name="tbaa">'<tt>tbaa</tt>' Metadata</a>
</h4>
@ -2966,6 +2981,7 @@ call void @llvm.dbg.value(metadata !24, i64 0, metadata !25)
</div>
<!-- _______________________________________________________________________ -->
<h4>
<a name="fpaccuracy">'<tt>fpaccuracy</tt>' Metadata</a>
</h4>