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Some additional data added to the bytecode specification.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@13626 91177308-0d34-0410-b5e6-96231b3b80d8
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Reid Spencer 2004-05-22 05:56:41 +00:00
parent 500266187c
commit 939290f808
1 changed files with 35 additions and 20 deletions
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docs/BytecodeFormat.html
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@ -67,9 +67,21 @@ the next block. The possible types of blocks are described below in the section
it is possible for entire blocks to be omitted from the file if they are
empty. The block identifier helps the reader determine which kind of block is
next in the file.</p>
<p>
Except for the <a href="#header">Header Block</a> all blocks are variable
length. The consume just enough bytes to express their contents.</p>
<p>The following block identifiers are currently in use
(from llvm/Bytecode/Format.h):</p>
<ol>
<li><b>Module (0x01)</b>.</li>
<li><b>Function (0x11)</b>.</li>
<li><b>ConstantPool (0x12)</b>.</li>
<li><b>SymbolTable (0x13)</b>.</li>
<li><b>ModuleGlobalInfo (0x14)</b>.</li>
<li><b>GlobalTypePlane (0x15)</b>.</li>
<li><b>BasicBlock (0x31)</b>.</li>
<li><b>InstructionList (0x32)</b>.</li>
<li><b>CompactionTable (0x33)</b>.</li>
</ol>
<p> Except for the <a href="#header">Header Block</a> all blocks are variable
length. They consume just enough bytes to express their contents.</p>
</div>
<!-- _______________________________________________________________________ -->
<div class="doc_subsection"><a name="lists">Lists</a> </div>
@ -130,6 +142,7 @@ will be added to ensure that the next entry is aligned to a 32-bit boundary.
<li><b>Align?</b> Indicates if this field is aligned to 32 bits or not.
This indicates where the <em>next</em> field starts, always on a 32 bit
boundary.</li>
<li><b>Type</b>. The basic type of information contained in the field.</li>
<li><b>Description</b>. Descripts the contents of the field.</li>
</ol>
</div>
@ -168,42 +181,43 @@ bytecode version. This block is fixed length and always eight bytes, as follows:
<th><b>Byte(s)</b></th>
<th><b>Bit(s)</b></th>
<th><b>Align?</b></th>
<th><b>Type</b></th>
<th align="left"><b>Field Description</b></th>
</tr>
<tr>
<td>00</td><td>00-07</td><td>No</td>
<td align="left">Constant "l"</td>
<td>00</td><td>00-07</td><td>No</td><td>Char</td>
<td align="left">Constant "l" (0x6C)</td>
</tr>
<tr>
<td>01</td><td>00-07</td><td>No</td>
<td align="left">Constant "l"</td>
<td>01</td><td>00-07</td><td>No</td><td>Char</td>
<td align="left">Constant "l" (0x6C)</td>
</tr>
<tr>
<td>02</td><td>00-07</td><td>No</td>
<td align="left">Constant "v"</td>
<td>02</td><td>00-07</td><td>No</td><td>Char</td>
<td align="left">Constant "v" (0x76)</td>
</tr>
<tr>
<td>03</td><td>00-07</td><td>No</td>
<td align="left">Constant "m"</td>
<td>03</td><td>00-07</td><td>No</td><td>Char</td>
<td align="left">Constant "m" (0x6D)</td>
</tr>
<tr>
<td>04-07</td><td>00</td><td>No</td>
<td align="left">Target is big endian</td>
<td>04-07</td><td>00</td><td>No</td><td>Bool</td>
<td align="left">Target is big endian?</td>
</tr>
<tr>
<td>04-07</td><td>01</td><td>No</td>
<td align="left">Target has long pointers</td>
<td>04-07</td><td>01</td><td>No</td><td>Bool</td>
<td align="left">Target has long pointers?</td>
</tr>
<tr>
<td>04-07</td><td>02</td><td>No</td>
<td align="left">Target has no endianess</td>
<td>04-07</td><td>02</td><td>No</td><td>Bool</td>
<td align="left">Target has no endianess?</td>
</tr>
<tr>
<td>04-07</td><td>03</td><td>No</td>
<td align="left">Target has no pointer size</td>
<td>04-07</td><td>03</td><td>No</td><td>Bool</td>
<td align="left">Target has no pointer size?</td>
</tr>
<tr>
<td>04-07</td><td>04-31</td><td>Yes</td>
<td>04-07</td><td>04-31</td><td>Yes</td><td>Unsigned</td>
<td align="left">The LLVM bytecode format version number</td>
</tr>
</table>
@ -227,6 +241,7 @@ bytecode version. This block is fixed length and always eight bytes, as follows:
<!-- _______________________________________________________________________ -->
<div class="doc_subsection"><a name="symtab">Module Symbol Table</a> </div>
<div class="doc_text">
<p>The module symbol table is a list of
</div>
<!-- *********************************************************************** -->