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More clarifications. 

llvm-svn: 133387
This commit is contained in:
John McCall 2011-06-19 10:12:24 +00:00
parent fb414bc66d
commit a994df5a02
1 changed files with 16 additions and 15 deletions
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clang/docs/AutomaticReferenceCounting.html
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@ -1492,14 +1492,15 @@ from exceptions.</p></div>
<div id="runtime">
<h1>Runtime support</h1>
<p>This section describes the requirements of the current ARC
implementation in Clang on the Objective-C runtime. It is not part of
the ARC language specification; instead, it is effectively a
language-specific ABI supplement, akin to the Itanium ABI for C++.</p>
<p>This section describes the interaction between the ARC runtime and
the code generated by the ARC compiler. This is not part of the ARC
language specification; instead, it is effectively a language-specific
ABI supplement, akin to the <q>Itanium</q> generic ABI for C++.</p>
<p>Ownership qualification does not alter the storage requirements for
an object, except that <tt>__weak</tt> objects must always be
appropriately aligned for an object of type <tt>id</tt>.</p>
objects, except that it is undefined behavior if a <tt>__weak</tt>
object is inadequately aligned for an object of type <tt>id</tt>. The
other qualifiers may be used on explicitly under-aligned memory.</p>
<p>The runtime tracks <tt>__weak</tt> objects which holds non-null
values. It is undefined behavior to direct modify a <tt>__weak</tt>
@ -1674,6 +1675,15 @@ may be left as null.</p>
on <tt>src</tt>.</p>
</div> <!-- runtime.objc_moveWeak -->
<div id="runtime.objc_release">
<h1><tt>void objc_release(id value);</tt></h1>
<p><i>Precondition:</i> <tt>value</tt> is null or a pointer to a
valid object.</p>
<p>If <tt>value</tt> is null, this call has no effect. Otherwise, it
performs a release operation exactly as if the object had been sent
the <tt>release</tt> message.</p>
</div> <!-- runtime.objc_release -->
<div id="runtime.objc_retain">
<h1><tt>id objc_retain(id value);</tt></h1>
<p><i>Precondition:</i> <tt>value</tt> is null or a pointer to a
@ -1735,15 +1745,6 @@ a retain operation is performed on the block exactly as if it had been
sent the <tt>retain</tt> message.</p>
</div> <!-- runtime.objc_retainBlock -->
<div id="runtime.objc_release">
<h1><tt>void objc_release(id value);</tt></h1>
<p><i>Precondition:</i> <tt>value</tt> is null or a pointer to a
valid object.</p>
<p>If <tt>value</tt> is null, this call has no effect. Otherwise, it
performs a release operation exactly as if the object had been sent
the <tt>release</tt> message.</p>
</div> <!-- runtime.objc_release -->
<div id="runtime.objc_storeStrong">
<h1><tt>id objc_storeStrong(id *object, id value);</tt></h1>
<p><i>Precondition:</i> <tt>object</tt> is a valid pointer to