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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@83736 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -759,17 +759,44 @@ releases of LLVM.</p>
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<div class="doc_text">
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<p>This release includes a number of new APIs that are used internally, which
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may also be useful for external clients.
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</p>
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<ul>
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<li>
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New PrettyStackTrace, crashes of llvm tools should give some indication of what the compiler was doing at the time of the crash (e.g. running a pass), and print out command line arguments.
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StringRef class, Twine class.
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New WeakVH and AssertingVH and CallbackVH classes.
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New llvm/ADT/Triple class.
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llvm_report_error() error handling API (llvm/Support/ErrorHandling.h)
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New llvm/System/Atomic.h, llvm/System/RWMutex.h for portable atomic ops, rw locks.
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New SourceMgr, SMLoc classes for simple parsers with caret diagnostics and #include support, (used by
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tablegen, llvm-mc, the .ll parser, FileCheck, etc)
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</li>
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<li>New <a href="http://llvm.org/doxygen/PrettyStackTrace_8h-source.html">
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PrettyStackTrace classes</a> allows crashes of llvm tools (and applications
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that integrate them) to provide more detailed indication of what the
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compiler was doing at the time of the crash (e.g. running a pass).
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At the top level for each LLVM tool, it includes the command line arguments.
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</li>
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<li>New <a href="http://llvm.org/doxygen/StringRef_8h-source.html">StringRef</a>
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and <a href="http://llvm.org/doxygen/Twine_8h-source.html">Twine</a> classes
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make operations on character ranges and
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string concatenation to be more efficient. StringRef is just a <tt>const
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char*</tt> with a length, Twine is a light-weight rope.</li>
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<li>LLVM has new WeakVH, AssertingVH, and CallbackVH classes, which make it
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easier to write LLVM IR transformations. WeakVH is automatically drops to
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null when the referenced Value is deleted, and is updated across a
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replaceAllUsesWith operation. AssertingVH aborts the program if the
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referenced value is destroyed while it is being referenced. CallbackVH is
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a customizable class for handling value references. See <a
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href="http://llvm.org/doxygen/ValueHandle_8h-source.html">ValueHandle.h</a>
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for more information.</li>
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<li>The new '<a href="http://llvm.org/doxygen/Triple_8h-source.html">Triple
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</a>' class centralizes a lot of logic that reasons about target
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triples.</li>
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<li>The new '<a href="http://llvm.org/doxygen/ErrorHandling.h_8h-source.html">
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llvm_report_error()</a>' set of APIs allows tools to embed the LLVM
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optimizer and backend and recover from previously unrecoverable errors.</li>
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<li>LLVM has new abstractions for <a
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href="http://llvm.org/doxygen/Atomic_8h-source.html">atomic operations</a>
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and <a href="http://llvm.org/doxygen/RWMutex_8h-source.html">reader/writer
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locks</a>.</li>
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<li>LLVM has new <a href="http://llvm.org/doxygen/SourceMgr_8h-source.html">
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SourceMgr and SMLoc classes</a> which implement caret diagnostics and basic
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include stack processing for simple parsers. It is used by tablegen,
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llvm-mc, the .ll parser and FileCheck.</li>
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</ul>
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@ -794,17 +821,21 @@ correct use counts, and has support for edge profiling with reduced runtime
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overhead. Combined, the generated profile information is both more correct and
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imposes about half as much overhead (2.6. from 12% to 6% overhead on SPEC
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CPU2000).</li>
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<li>Many extensions to the C APIs.</li>
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<li>The C bindings (in the llvm/include/llvm-c directory) include many newly
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supported APIs.</li>
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<li>LLVM 2.6 includes a brand new experimental LLVM bindings to the Ada2005
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programming language.</li>
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programming language.</li>
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<li>LLVMC:
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* Dynamic plugins now work on Windows.
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* New option property: init. Makes possible to provide default values for
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options defined in plugins (interface to cl::init).
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* New example: Skeleton, shows how to create a standalone LLVMC-based driver.
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* New example: mcc16, a driver for the PIC16 toolchain.</li>
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<li>The LLVMC driver has several new features:
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<ul>
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<li>Dynamic plugins now work on Windows.</li>
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<li>New option property: init. Makes possible to provide default values for
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options defined in plugins (interface to cl::init).</li>
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<li>New example: Skeleton, shows how to create a standalone LLVMC-based
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driver.</li>
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<li>New example: mcc16, a driver for the PIC16 toolchain.</li>
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</ul>
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</li>
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</ul>
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