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remove unions from LLVM IR. They are severely buggy and not

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being actively maintained, improved, or extended.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112356 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2010-08-28 04:09:24 +00:00
parent 5f88af5376
commit 61c70e98ac
33 changed files with 35 additions and 822 deletions
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15
docs/BitCodeFormat.html
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@@ -1367,21 +1367,6 @@ type to the type table.
</p>
</div>
<!-- _______________________________________________________________________ -->
<div class="doc_subsubsection"><a name="TYPE_CODE_UNION">TYPE_CODE_UNION Record</a>
</div>
<div class="doc_text">
<p><tt>[UNION, ...eltty...]</tt></p>
<p>The <tt>UNION</tt> record (code 17) adds a <tt>union</tt> type to
the type table. The <i>eltty</i> operand fields are zero or more type
indices representing the element types of the union.
</p>
</div>
<!-- ======================================================================= -->
<div class="doc_subsection"><a name="CONSTANTS_BLOCK">CONSTANTS_BLOCK Contents</a>
</div>

11
docs/GetElementPtr.html
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@@ -26,7 +26,6 @@
<li><a href="#lead0">Why don't GEP x,0,0,1 and GEP x,1 alias? </a></li>
<li><a href="#trail0">Why do GEP x,1,0,0 and GEP x,1 alias? </a></li>
<li><a href="#vectors">Can GEP index into vector elements?</a>
<li><a href="#unions">Can GEP index into unions?</a>
<li><a href="#addrspace">What effect do address spaces have on GEPs?</a>
<li><a href="#int">How is GEP different from ptrtoint, arithmetic, and inttoptr?</a></li>
<li><a href="#be">I'm writing a backend for a target which needs custom lowering for GEP. How do I do this?</a>
@@ -369,16 +368,6 @@ idx3 = (char*) &amp;MyVar + 8
<!-- *********************************************************************** -->
<div class="doc_subsection">
<a name="unions"><b>Can GEP index into unions?</b></a>
</div>
<div class="doc_text">
<p>Unknown.</p>
</div>
<!-- *********************************************************************** -->
<div class="doc_subsection">
<a name="addrspace"><b>What effect do address spaces have on GEPs?</b></a>
</div>

74
docs/LangRef.html
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@@ -74,7 +74,6 @@
<li><a href="#t_array">Array Type</a></li>
<li><a href="#t_struct">Structure Type</a></li>
<li><a href="#t_pstruct">Packed Structure Type</a></li>
<li><a href="#t_union">Union Type</a></li>
<li><a href="#t_vector">Vector Type</a></li>
</ol>
</li>
@@ -1475,7 +1474,6 @@ Classifications</a> </div>
<a href="#t_pointer">pointer</a>,
<a href="#t_vector">vector</a>,
<a href="#t_struct">structure</a>,
<a href="#t_union">union</a>,
<a href="#t_array">array</a>,
<a href="#t_label">label</a>,
<a href="#t_metadata">metadata</a>.
@@ -1495,7 +1493,6 @@ Classifications</a> </div>
<a href="#t_pointer">pointer</a>,
<a href="#t_struct">structure</a>,
<a href="#t_pstruct">packed structure</a>,
<a href="#t_union">union</a>,
<a href="#t_vector">vector</a>,
<a href="#t_opaque">opaque</a>.
</td>
@@ -1643,8 +1640,8 @@ Classifications</a> </div>
<p>Aggregate Types are a subset of derived types that can contain multiple
member types. <a href="#t_array">Arrays</a>,
<a href="#t_struct">structs</a>, <a href="#t_vector">vectors</a> and
<a href="#t_union">unions</a> are aggregate types.</p>
<a href="#t_struct">structs</a>, and <a href="#t_vector">vectors</a> are
aggregate types.</p>
</div>
@@ -1714,9 +1711,7 @@ Classifications</a> </div>
<h5>Overview:</h5>
<p>The function type can be thought of as a function signature. It consists of
a return type and a list of formal parameter types. The return type of a
function type is a scalar type, a void type, a struct type, or a union
type. If the return type is a struct type then all struct elements must be
of first class types, and the struct must have at least one element.</p>
function type is a first class type or a void type.</p>
<h5>Syntax:</h5>
<pre>
@@ -1837,53 +1832,6 @@ Classifications</a> </div>
</div>
<!-- _______________________________________________________________________ -->
<div class="doc_subsubsection"> <a name="t_union">Union Type</a> </div>
<div class="doc_text">
<h5>Overview:</h5>
<p>A union type describes an object with size and alignment suitable for
an object of any one of a given set of types (also known as an "untagged"
union). It is similar in concept and usage to a
<a href="#t_struct">struct</a>, except that all members of the union
have an offset of zero. The elements of a union may be any type that has a
size. Unions must have at least one member - empty unions are not allowed.
</p>
<p>The size of the union as a whole will be the size of its largest member,
and the alignment requirements of the union as a whole will be the largest
alignment requirement of any member.</p>
<p>Union members are accessed using '<tt><a href="#i_load">load</a></tt> and
'<tt><a href="#i_store">store</a></tt>' by getting a pointer to a field with
the '<tt><a href="#i_getelementptr">getelementptr</a></tt>' instruction.
Since all members are at offset zero, the getelementptr instruction does
not affect the address, only the type of the resulting pointer.</p>
<h5>Syntax:</h5>
<pre>
union { &lt;type list&gt; }
</pre>
<h5>Examples:</h5>
<table class="layout">
<tr class="layout">
<td class="left"><tt>union { i32, i32*, float }</tt></td>
<td class="left">A union of three types: an <tt>i32</tt>, a pointer to
an <tt>i32</tt>, and a <tt>float</tt>.</td>
</tr><tr class="layout">
<td class="left">
<tt>union {&nbsp;float,&nbsp;i32&nbsp;(i32)&nbsp;*&nbsp;}</tt></td>
<td class="left">A union, where the first element is a <tt>float</tt> and the
second element is a <a href="#t_pointer">pointer</a> to a
<a href="#t_function">function</a> that takes an <tt>i32</tt>, returning
an <tt>i32</tt>.</td>
</tr>
</table>
</div>
<!-- _______________________________________________________________________ -->
<div class="doc_subsubsection"> <a name="t_pointer">Pointer Type</a> </div>
@@ -2125,14 +2073,6 @@ Classifications</a> </div>
the number and types of elements must match those specified by the
type.</dd>
<dt><b>Union constants</b></dt>
<dd>Union constants are represented with notation similar to a structure with
a single element - that is, a single typed element surrounded
by braces (<tt>{}</tt>)). For example: "<tt>{ i32 4 }</tt>". The
<a href="#t_union">union type</a> can be initialized with a single-element
struct as long as the type of the struct element matches the type of
one of the union members.</dd>
<dt><b>Array constants</b></dt>
<dd>Array constants are represented with notation similar to array type
definitions (a comma separated list of elements, surrounded by square
@@ -4153,7 +4093,7 @@ Instruction</a> </div>
<h5>Arguments:</h5>
<p>The first operand of an '<tt>extractvalue</tt>' instruction is a value
of <a href="#t_struct">struct</a>, <a href="#t_union">union</a> or
of <a href="#t_struct">struct</a> or
<a href="#t_array">array</a> type. The operands are constant indices to
specify which value to extract in a similar manner as indices in a
'<tt><a href="#i_getelementptr">getelementptr</a></tt>' instruction.</p>
@@ -4187,7 +4127,7 @@ Instruction</a> </div>
<h5>Arguments:</h5>
<p>The first operand of an '<tt>insertvalue</tt>' instruction is a value
of <a href="#t_struct">struct</a>, <a href="#t_union">union</a> or
of <a href="#t_struct">struct</a> or
<a href="#t_array">array</a> type. The second operand is a first-class
value to insert. The following operands are constant indices indicating
the position at which to insert the value in a similar manner as indices in a
@@ -4420,12 +4360,12 @@ Instruction</a> </div>
indexes a value of the type pointed to (not necessarily the value directly
pointed to, since the first index can be non-zero), etc. The first type
indexed into must be a pointer value, subsequent types can be arrays,
vectors, structs and unions. Note that subsequent types being indexed into
vectors, and structs. Note that subsequent types being indexed into
can never be pointers, since that would require loading the pointer before
continuing calculation.</p>
<p>The type of each index argument depends on the type it is indexing into.
When indexing into a (optionally packed) structure or union, only <tt>i32</tt>
When indexing into a (optionally packed) structure, only <tt>i32</tt>
integer <b>constants</b> are allowed. When indexing into an array, pointer
or vector, integers of any width are allowed, and they are not required to be
constant.</p>

3
docs/ReleaseNotes.html
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@@ -67,9 +67,8 @@ Almost dead code.
include/llvm/Analysis/LiveValues.h => Dan
lib/Transforms/IPO/MergeFunctions.cpp => consider for 2.8.
llvm/Analysis/PointerTracking.h => Edwin wants this, consider for 2.8.
ABCD, GEPSplitterPass
GEPSplitterPass
MSIL backend?
lib/Transforms/Utils/SSI.cpp -> ABCD depends on it.
-->