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final changes.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@83737 91177308-0d34-0410-b5e6-96231b3b80d8
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Chris Lattner
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@ -854,31 +854,32 @@ on LLVM 2.5, this section lists some "gotchas" that you may run into upgrading
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from the previous release.</p>
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<ul>
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<li>The Itanium (IA64) backend has been removed. It was not supported and
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had bitrotted.</li>
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<li>The Itanium (IA64) backend has been removed. It was not actively supported
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and had bitrotted.</li>
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<li>The BigBlock register allocator has been removed, it had also bitrotted.</li>
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<li>The C Backend (-march=c) is no longer considered part of the LLVM release
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criteria. We still want it to work, but no one is maintaining it and it lacks
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support for arbitrary precision integers and other important IR features.</li>
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</ul>
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LLVM build now builds all libraries as .a files instead of some
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<li>All LLVM tools now default to overwriting their output file, behaving more
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like standard unix tools. Previously, this only happened with the '-f'
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option.</li>
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<li>LLVM build now builds all libraries as .a files instead of some
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libraries as relinked .o files. This requires some APIs like
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InitializeAllTargets.h. TargetRegistry!
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InitializeAllTargets.h.
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</li>
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</ul>
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<p>In addition, many APIs have changed in this release. Some of the major LLVM
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API changes are:</p>
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API Cleanup:
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no use of hash_set/hash_map, no more llvm::OStream
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Use raw_ostream for everything, killed off llvm/Streams.h and DOUT
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<ul>
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<li>All uses of hash_set and hash_map have been removed from the LLVM tree and
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the wrapper headers have been removed.</li>
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<li>The llvm/Streams.h and DOUT member of Debug.h have been removed. The
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llvm::Ostream class has been completely removed and replaced with uses of
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raw_ostream.</li>
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<li>LLVM's global uniquing tables for <tt>Type</tt>s and <tt>Constant</tt>s have
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been privatized into members of an <tt>LLVMContext</tt>. A number of APIs
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now take an <tt>LLVMContext</tt> as a parameter. To smooth the transition
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@ -911,7 +912,9 @@ used.</li>
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and <tt>Twine</tt> classes instead of passing <tt>const char*</tt>
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or <tt>std::string</tt>, as described in
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the <a href="ProgrammersManual.html#string_apis">Programmer's Manual</a>. Most
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clients should be unaffected by this transition, unless they are used to <tt>Value::getName()</tt> returning a string. Here are some tips on updating to 2.6:
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clients should be unaffected by this transition, unless they are used to
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<tt>Value::getName()</tt> returning a string. Here are some tips on updating to
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2.6:
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<ul>
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<li><tt>getNameStr()</tt> is still available, and matches the old
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behavior. Replacing <tt>getName()</tt> calls with this is an safe option,
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@ -937,7 +940,9 @@ clients should be unaffected by this transition, unless they are used to <tt>Val
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</li>
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<li>The registration interfaces for backend Targets has changed (what was
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previously TargetMachineRegistry). For backend authors, see the <a href="WritingAnLLVMBackend.html#TargetRegistration">Writing An LLVM Backend</a> guide. For clients, the notable API changes are:
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previously TargetMachineRegistry). For backend authors, see the <a
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href="WritingAnLLVMBackend.html#TargetRegistration">Writing An LLVM Backend</a>
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guide. For clients, the notable API changes are:
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<ul>
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<li><tt>TargetMachineRegistry</tt> has been renamed
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to <tt>TargetRegistry</tt>.</li>
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@ -946,13 +951,6 @@ previously TargetMachineRegistry). For backend authors, see the <a href="Writing
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function to find targets.</li>
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</ul>
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</li>
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<li>llvm-dis now fails if the output file exists, instead of dumping to stdout.
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FIXME: describe any other tool changes due to the raw_fd_ostream change. FIXME:
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This is not an API change, maybe there should be a tool changes section?</li>
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<li>temporarily due to Context API change passes should call doInitialization()
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method of the pass they inherit from, otherwise Context is NULL.
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FIXME: remove this entry when this is no longer needed.<li>
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</ul>
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</div>
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@ -971,9 +969,10 @@ FIXME: remove this entry when this is no longer needed.<li>
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<ul>
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<li>Intel and AMD machines (IA32, X86-64, AMD64, EMT-64) running Red Hat
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Linux, Fedora Core, FreeBSD and AuroraUX (and probably other unix-like systems).</li>
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Linux, Fedora Core, FreeBSD and AuroraUX (and probably other unix-like
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systems).</li>
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<li>PowerPC and X86-based Mac OS X systems, running 10.3 and above in 32-bit
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and 64-bit modes.</li>
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and 64-bit modes.</li>
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<li>Intel and AMD machines running on Win32 using MinGW libraries (native).</li>
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<li>Intel and AMD machines running on Win32 with the Cygwin libraries (limited
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support is available for native builds with Visual C++).</li>
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@ -1027,9 +1026,11 @@ components, please contact us on the <a
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href="http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev">LLVMdev list</a>.</p>
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<ul>
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<li>The MSIL, Alpha, SPU, MIPS, and PIC16 backends are experimental.</li>
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<li>The MSIL, Alpha, SPU, MIPS, PIC16, Blackfin, MSP430 and SystemZ backends are
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experimental.</li>
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<li>The <tt>llc</tt> "<tt>-filetype=asm</tt>" (the default) is the only
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supported value for this option.</li>
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supported value for this option. The ELF writer is experimental.</li>
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<li>The implementation of Andersen's Alias Analysis has many known bugs.</li>
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</ul>
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</div>
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@ -1118,7 +1119,6 @@ results (<a href="http://llvm.org/PR1388">PR1388</a>).</li>
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<div class="doc_text">
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<ul>
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<li>The O32 ABI is not fully supported.</li>
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<li>64-bit MIPS targets are not supported yet.</li>
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</ul>
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@ -1166,10 +1166,6 @@ appropriate nops inserted to ensure restartability.</li>
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<div class="doc_text">
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<p>llvm-gcc does not currently support <a href="http://llvm.org/PR869">Link-Time
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Optimization</a> on most platforms "out-of-the-box". Please inquire on the
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LLVMdev mailing list if you are interested.</p>
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<p>The only major language feature of GCC not supported by llvm-gcc is
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the <tt>__builtin_apply</tt> family of builtins. However, some extensions
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are only supported on some targets. For example, trampolines are only
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