Changes in directory llvm/docs:
BytecodeFormat.html updated: 1.45 -> 1.46
---
Log message:
describe extensions to the .bc format for function/global alignment
---
Diffs of the changes: (+70 -6)
BytecodeFormat.html | 76 +++++++++++++++++++++++++++++++++++++++++++++++-----
1 files changed, 70 insertions(+), 6 deletions(-)
Index: llvm/docs/BytecodeFormat.html
diff -u llvm/docs/BytecodeFormat.html:1.45 llvm/docs/BytecodeFormat.html:1.46
--- llvm/docs/BytecodeFormat.html:1.45 Sat Nov 5 16:32:06 2005
+++ llvm/docs/BytecodeFormat.html Sun Nov 6 01:20:25 2005
@@ -992,12 +992,16 @@
<!-- _______________________________________________________________________
-->
<div class="doc_subsubsection"><a name="globalvar">Global Variable Field</a>
</div>
+
<div class="doc_text">
+
<p>Global variables are written using an <a href="#uint32_vbr">uint32_vbr</a>
-that encodes information about the global variable and a list of the
-constant initializers for the global var, if any.</p>
+that encodes information about the global variable, an optional extension vbr,
+and a an optional initializers for the global var.</p>
+
<p>The table below provides the bit layout of the first <a
href="#uint32_vbr">uint32_vbr</a> that describes the global variable.</p>
+
<table>
<tbody>
<tr>
@@ -1025,8 +1029,43 @@
</tr>
</tbody>
</table>
+
+<p>When the Linkage type is set to 3 (internal) and the initializer field is
set
+to 0 (an invalid combination), an extension word follows the first <a
+href="#uint32_vbr">uint32_vbr</a> which encodes the real linkage and init flag,
+and can includes more information:</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">Has initializer? Indicates the real value of the
"Has
+ initializer" field for the global. </td>
+ </tr>
+ <tr>
+ <td><a href="#bit">bit(2-4)</a></td>
+ <td class="td_left">Linkage type: Indicates the real value of the
"linkage
+ type" field for the global.</td>
+ </tr>
+ <tr>
+ <td><a href="#bit">bit(4-8)</a></td>
+ <td class="td_left">The log-base-2 of the alignment for the global.</td>
+ </tr>
+ <tr>
+ <td><a href="#bit">bit(9-31)</a></td>
+ <td class="td_left">Currently unassigned.</td>
+ </tr>
+ </tbody>
+</table>
+
<p>The table below provides the format of the constant initializers for
-the global variable field, if it has one.</p>
+the global variable field, if it has one (indicated by the "Has initializer"
+field).</p>
+
<table>
<tbody>
<tr>
@@ -1048,7 +1087,8 @@
</div>
<div class="doc_text">
<p>Functions are written using an <a href="#uint32_vbr">uint32_vbr</a>
-that encodes information about the function and a set of flags.</p>
+that encodes information about the function and a set of flags. If needed,
+an extension word may follow this first field.</p>
<p>The table below provides the bit layout of the <a
href="#uint32_vbr">uint32_vbr</a> that describes the function.</p>
@@ -1074,9 +1114,33 @@
Block</a> in the bytecode file for the function.</td>
</tr>
<tr>
- <td><a href="#bit">bit(5-)</a></td>
+ <td><a href="#bit">bit(5-30)</a></td>
<td class="td_left">Type slot number of type for the function.</td>
</tr>
+ <tr>
+ <td><a href="#bit">bit(31)</a></td>
+ <td class="td_left">Indicates whether an extension word follows.</td>
+ </tr>
+ </tbody>
+</table>
+
+<p>If bit(31) is set, an additional <a href="#uint32_vbr">uint32_vbr</a> word
+follows with the following fields:</p>
+
+<table>
+ <tbody>
+ <tr>
+ <th><b>Type</b></th>
+ <th class="td_left"><b>Description</b></th>
+ </tr>
+ <tr>
+ <td><a href="#bit">bit(0-4)</a></td>
+ <td class="td_left">The log-base-2 of the alignment for the
function.</td>
+ </tr>
+ <tr>
+ <td><a href="#bit">bit(5-31)</a></td>
+ <td class="td_left">Currently unassigned.</td>
+ </tr>
</tbody>
</table>
@@ -1979,7 +2043,7 @@
<a href="mailto:[EMAIL PROTECTED]">Reid Spencer</a> and <a
href="mailto:[EMAIL PROTECTED]">Chris Lattner</a><br>
<a href="http://llvm.cs.uiuc.edu";>The LLVM Compiler Infrastructure</a><br>
-Last modified: $Date: 2005/11/05 22:32:06 $
+Last modified: $Date: 2005/11/06 07:20:25 $
</address>
</body>
</html>
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