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Describe the recent changes to the bytecode format for PR761.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@33586 91177308-0d34-0410-b5e6-96231b3b80d8
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Owen Anderson 2007-01-27 19:23:25 +00:00
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docs/BytecodeFormat.html
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@ -700,55 +700,23 @@ sections.</p>
<!-- _______________________________________________________________________ -->
<div class="doc_subsubsection"><a name="format">Format Information</a></div>
<div class="doc_text">
<p>The format information field is encoded into a <a href="#uint32_vbr">uint32_vbr</a>
as shown in the following table.</p>
<table>
<tbody>
<tr>
<th><b>Type</b></th>
<th class="td_left"><b>Description</b></th>
</tr>
<tr>
<td><a href="#bit">bit(0)</a></td>
<td class="td_left">Target is big endian?</td>
</tr>
<tr>
<td><a href="#bit">bit(1)</a></td>
<td class="td_left">On target pointers are 64-bit?</td>
</tr>
<tr>
<td><a href="#bit">bit(2)</a></td>
<td class="td_left">Target has no endianess?</td>
</tr>
<tr>
<td><a href="#bit">bit(3)</a></td>
<td class="td_left">Target has no pointer size?</td>
</tr>
<tr>
<td><a href="#bit">bit(4-31)</a></td>
<td class="td_left">Bytecode format version</td>
</tr>
</tbody>
</table>
<p>
Of particular note, the bytecode format number is simply a 28-bit
<p>The format information field is encoded into a <a href="#uint32_vbr">uint32_vbr</a>.</p>
<p>Of particular note, the bytecode format number is simply a 32-bit
monotonically increasing integer that identifies the version of the bytecode
format (which is not directly related to the LLVM release number). The
bytecode versions defined so far are (note that this document only
describes the latest version, 1.3):</p>
describes the latest version, 2.0):</p>
<ul>
<li>#0: LLVM 1.0 &amp; 1.1</li>
<li>#1: LLVM 1.2</li>
<li>#2: LLVM 1.2.5 (not released)</li>
<li>#3: LLVM 1.3</li>
<li>#4: LLVM 1.3.x (not released)</li>
<li>#5: LLVM 1.4 and newer</li>
<li>#5: LLVM 1.4 through 1.8</li>
<li>#6: LLVM 1.9</li>
<li>#7: LLVM 2.0 and newer</li>
</ul>
<p>Note that we plan to eventually expand the target description
capabilities
of bytecode files to <a href="http://llvm.org/PR263">target
triples</a>.
</p>
</div>
<!-- _______________________________________________________________________ -->
<div class="doc_subsection"><a name="globaltypes">Global Type Pool</a> </div>
@ -993,7 +961,12 @@ depends upon.</td>
<td><a href="#string">string</a></td>
<td class="td_left">The target
triple for the module (blank means no target triple specified, i.e. a
platform independent module).</td>
platform-independent module).</td>
</tr>
<tr>
<td><a href="#string">string</a></td>
<td class="td_left">The data layout string describing the endianness, pointer size, and
type alignments for which the module was written (blank means no data layout specified, i.e. a platform-independent module).</td>
</tr>
<tr>
<td><a href="#llist">llist</a>(<a href="#string">string</a>)</td>