maxjhandsome
/
llvm-project
forked from OSchip/llvm-project
1
0
Fork 0
Code Issues Pull Requests Packages Releases Wiki Activity

Last major chunk of features. This covers a couple of language 

extensions and one infrastructure feature addition that has a direct
impact on other projects which use Clang.

llvm-svn: 145335
This commit is contained in:
Chandler Carruth 2011-11-29 00:15:26 +00:00
parent 30befa0f7a
commit cb9f4c7fde
1 changed files with 32 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

36
clang/docs/ReleaseNotes.html
View File

@ -87,12 +87,8 @@ Clang's support for those languages.</p>
the history. Anything still here needs to be distilled and turned into proper
prose in a section of its own. When doing that, delete the notes.</p>
<ul>
<li>OS Availability attribute -- r128127</li>
<li>Improved AST support for partially constructed nodes and incomplete
information for LLDB and other clients which dynamically build AST nodes.</li>
<li>Memory reduction -- initializers, macro expansions, source locations,
etc.</li>
<li>Thread Safety attributes and correctness analysis added to Clang.</li>
<li>Major improvements to the interactions between serializing and
deserializing the AST and the preprocessor -- argiris</li>
</ul>
@ -193,6 +189,38 @@ be used as a compiler in a few Windows contexts.
<li>Add support for Microsoft __if_exists/__if_not_exists statements (-fms-extensions mode).</li>
</ul>
<h4 id="availability">New availability attribute to detect and warn about API
usage across OS X and iOS versions</h4>
Clang now supports an attribute which documents the availability of an API
across various platforms and releases, allowing interfaces to include
information about what OS versions support the relevant features. Based on the
targeted version of a compile, warnings for deprecated and unavailable
interfaces will automatically be provided by Clang.
<h4 id="threadsafety">Thread Safety annotations and analysis-based warnings</h4>
A set of annotations were introduced to Clang to describe the various
thread-safety concerns of a program, and an accompanying set of analysis based
warnings will diagnose clearly unsafe code patterns. The annotations are
described in the
<a href="http://clang.llvm.org/docs/LanguageExtensions.html#threadsafety">extension specification</a>,
and the warnings currently supported include:
<ul>
<li>Calling functions without the required locks</li>
<li>Reading variables without the required locks</li>
<li>Writing to variables without an exclusive lock (even if holding a shared
lock)</li>
<li>Imbalance between locks and unlocks across loop entries and exits</li>
<li>Acquiring or releasing locks out of order</li>
</ul>
<h4 id="incompleteast">Improved support for partially constructed and/or
incomplete ASTs</h4>
For users such as LLDB that are dynamically forming C++ ASTs, sometimes it is
either necessary or useful to form a partial or incomplete AST. Support for
these use cases have improved through the introduction of "unknown" types and
other AST constructs designed specifically for use cases without complete
information about the C++ construct being formed.
<!--
Need Peter and/or Tanya to flesh this out if we want it in 3.0's notes.. The
state isn't clear just from documentation or commit logs.