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[unwind removal] Remove any mention of the 'unwind' instruction. What was that

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instruction anyway?!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@149913 91177308-0d34-0410-b5e6-96231b3b80d8
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Bill Wendling 2012-02-06 21:57:33 +00:00
parent 7302d80490
commit 7b9e539268
1 changed files with 10 additions and 51 deletions
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@ -128,7 +128,6 @@
<li><a href="#i_switch">'<tt>switch</tt>' Instruction</a></li>
<li><a href="#i_indirectbr">'<tt>indirectbr</tt>' Instruction</a></li>
<li><a href="#i_invoke">'<tt>invoke</tt>' Instruction</a></li>
<li><a href="#i_unwind">'<tt>unwind</tt>' Instruction</a></li>
<li><a href="#i_resume">'<tt>resume</tt>' Instruction</a></li>
<li><a href="#i_unreachable">'<tt>unreachable</tt>' Instruction</a></li>
</ol>
@ -1206,8 +1205,7 @@ define void @f() optsize { ... }
It does not write through any pointer arguments
(including <tt><a href="#byval">byval</a></tt> arguments) and never
changes any state visible to callers. This means that it cannot unwind
exceptions by calling the <tt>C++</tt> exception throwing methods, but
could use the <tt>unwind</tt> instruction.</dd>
exceptions by calling the <tt>C++</tt> exception throwing methods.</dd>
<dt><tt><b><a name="readonly">readonly</a></b></tt></dt>
<dd>This attribute indicates that the function does not write through any
@ -1217,8 +1215,7 @@ define void @f() optsize { ... }
and read state that may be set in the caller. A readonly function always
returns the same value (or unwinds an exception identically) when called
with the same set of arguments and global state. It cannot unwind an
exception by calling the <tt>C++</tt> exception throwing methods, but may
use the <tt>unwind</tt> instruction.</dd>
exception by calling the <tt>C++</tt> exception throwing methods.</dd>
<dt><tt><b><a name="returns_twice">returns_twice</a></b></tt></dt>
<dd>This attribute indicates that this function can return twice. The
@ -2543,7 +2540,7 @@ b: unreachable
control back to them.</li>
<li><a href="#i_invoke"><tt>Invoke</tt></a> instructions depend on the
<a href="#i_ret"><tt>ret</tt></a>, <a href="#i_unwind"><tt>unwind</tt></a>,
<a href="#i_ret"><tt>ret</tt></a>, <a href="#i_resume"><tt>resume</tt></a>,
or exception-throwing call instructions that dynamically transfer control
back to them.</li>
@ -3180,7 +3177,6 @@ cast formed of bitcast or getelementptr. For example, a legal use of it is:</p>
'<a href="#i_switch"><tt>switch</tt></a>',
'<a href="#i_indirectbr"><tt>indirectbr</tt></a>',
'<a href="#i_invoke"><tt>invoke</tt></a>',
'<a href="#i_unwind"><tt>unwind</tt></a>',
'<a href="#i_resume"><tt>resume</tt></a>', and
'<a href="#i_unreachable"><tt>unreachable</tt></a>'.</p>
@ -3400,9 +3396,9 @@ IfUnequal:
'<tt>normal</tt>' label or the '<tt>exception</tt>' label. If the callee
function returns with the "<tt><a href="#i_ret">ret</a></tt>" instruction,
control flow will return to the "normal" label. If the callee (or any
indirect callees) returns with the "<a href="#i_unwind"><tt>unwind</tt></a>"
instruction, control is interrupted and continued at the dynamically nearest
"exception" label.</p>
indirect callees) returns via the "<a href="#i_resume"><tt>resume</tt></a>"
instruction or other exception handling mechanism, control is interrupted and
continued at the dynamically nearest "exception" label.</p>
<p>The '<tt>exception</tt>' label is a
<i><a href="ExceptionHandling.html#overview">landing pad</a></i> for the
@ -3444,8 +3440,9 @@ IfUnequal:
<li>'<tt>normal label</tt>': the label reached when the called function
executes a '<tt><a href="#i_ret">ret</a></tt>' instruction. </li>
<li>'<tt>exception label</tt>': the label reached when a callee returns with
the <a href="#i_unwind"><tt>unwind</tt></a> instruction. </li>
<li>'<tt>exception label</tt>': the label reached when a callee returns via
the <a href="#i_resume"><tt>resume</tt></a> instruction or other exception
handling mechanism.</li>
<li>The optional <a href="#fnattrs">function attributes</a> list. Only
'<tt>noreturn</tt>', '<tt>nounwind</tt>', '<tt>readonly</tt>' and
@ -3468,9 +3465,6 @@ IfUnequal:
block to the "normal" label. If the callee unwinds then no return value is
available.</p>
<p>Note that the code generator does not yet completely support unwind, and
that the invoke/unwind semantics are likely to change in future versions.</p>
<h5>Example:</h5>
<pre>
%retval = invoke i32 @Test(i32 15) to label %Continue
@ -3479,41 +3473,6 @@ that the invoke/unwind semantics are likely to change in future versions.</p>
unwind label %TestCleanup <i>; {i32}:retval set</i>
</pre>
</div>
<!-- _______________________________________________________________________ -->
<h4>
<a name="i_unwind">'<tt>unwind</tt>' Instruction</a>
</h4>
<div>
<h5>Syntax:</h5>
<pre>
unwind
</pre>
<h5>Overview:</h5>
<p><span class="doc_warning">N.B. The <tt>unwind</tt> instruction has been
deprecated and is slated for removal.</span></p>
<p>The '<tt>unwind</tt>' instruction unwinds the stack, continuing control flow
at the first callee in the dynamic call stack which used
an <a href="#i_invoke"><tt>invoke</tt></a> instruction to perform the call.
This is primarily used to implement exception handling.</p>
<h5>Semantics:</h5>
<p>The '<tt>unwind</tt>' instruction causes execution of the current function to
immediately halt. The dynamic call stack is then searched for the
first <a href="#i_invoke"><tt>invoke</tt></a> instruction on the call stack.
Once found, execution continues at the "exceptional" destination block
specified by the <tt>invoke</tt> instruction. If there is no <tt>invoke</tt>
instruction in the dynamic call chain, undefined behavior results.</p>
<p>Note that the code generator does not yet completely support unwind, and
that the invoke/unwind semantics are likely to change in future versions.</p>
</div>
<!-- _______________________________________________________________________ -->
@ -4700,7 +4659,7 @@ that the invoke/unwind semantics are likely to change in future versions.</p>
'<tt>alloca</tt>' instruction is commonly used to represent automatic
variables that must have an address available. When the function returns
(either with the <tt><a href="#i_ret">ret</a></tt>
or <tt><a href="#i_unwind">unwind</a></tt> instructions), the memory is
or <tt><a href="#i_resume">resume</a></tt> instructions), the memory is
reclaimed. Allocating zero bytes is legal, but the result is undefined.</p>
<h5>Example:</h5>