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Correct the documentation for the module block header which uses the long

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format instead of the short format used in other blocks.

Discrepancy noted by Robert Mykland. Thanks Robert!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@15826 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Reid Spencer 2004-08-16 19:24:36 +00:00
parent cdc4b86e35
commit 5bc74d551a
1 changed files with 22 additions and 4 deletions
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26
docs/BytecodeFormat.html
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@ -614,10 +614,13 @@ sections.</p>
<th class="td_left"><b>Field Description</b></th>
</tr>
<tr>
<td><a href="#block">block</a><br>
</td>
<td class="td_left">Module Block Identifier (0x01) and Size<br>
</td>
<td><a href="#unsigned">unsigned</a><br></td>
<td class="td_left"><a href="#mod_header">Module Block Identifier
(0x01)</a></td>
</tr>
<tr>
<td><a href="#unsigned">unsigned</a></td>
<td class="td_left"><a href="#mod_header">Module Block Size</a></td>
</tr>
<tr>
<td><a href="#uint32_vbr">uint32_vbr</a></td>
@ -646,6 +649,21 @@ sections.</p>
</tbody>
</table>
</div>
<!-- _______________________________________________________________________ -->
<div class="doc_subsubsection"><a name="mod_header">Module Block Header</a></div>
<div class="doc_text">
<p>The block header for the module block uses a longer format than the other
blocks in a bytecode file. Specifically, instead of encoding the type and size
of the block into a 32-bit integer with 5-bits for type and 27-bits for size,
the module block header uses two 32-bit unsigned values, one for type, and one
for size. While the 2<sup>27</sup> byte limit on block size is sufficient for the blocks
contained in the module, it isn't sufficient for the module block itself
because we want to ensure that bytecode files as large as 2<sup>32</sup> bytes
are possible. For this reason, the module block (and only the module block)
uses a long format header.</p>
</div>
<!-- _______________________________________________________________________ -->
<div class="doc_subsubsection"><a name="format">Format Information</a></div>
<div class="doc_text">