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gerrit-public.fairphone.software / fp2-dev / platform / external / llvm / 7506b1d6989939cdf2770194f98cfe8106f0fca5 / . / docs / ReleaseNotes.html
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Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]1<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
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3<html>
4<head>
Reid Spencer6454ed32004-11-18 18:38:58 +0000[diff] [blame]5 <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]6 <link rel="stylesheet" href="llvm.css" type="text/css">
Chris Lattner5c3389a2004-08-16 00:20:18 +0000[diff] [blame]7 <title>LLVM 1.4 Release Notes</title>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]8</head>
9<body>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]10
Chris Lattner5c3389a2004-08-16 00:20:18 +0000[diff] [blame]11<div class="doc_title">LLVM 1.4 Release Notes</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]12
13<ol>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]14 <li><a href="#intro">Introduction</a></li>
15 <li><a href="#whatsnew">What's New?</a></li>
Chris Lattner4b538b92004-04-30 22:17:12 +0000[diff] [blame]16 <li><a href="GettingStarted.html">Installation Instructions</a></li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]17 <li><a href="#portability">Portability and Supported Platforms</a></li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]18 <li><a href="#knownproblems">Known Problems</a>
19 <ul>
Chris Lattner2974b5b2004-04-01 00:41:31 +0000[diff] [blame]20 <li><a href="#experimental">Experimental features included in this
21 release</a>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]22 <li><a href="#core">Known problems with the LLVM Core</a>
23 <li><a href="#c-fe">Known problems with the C Front-end</a>
24 <li><a href="#c++-fe">Known problems with the C++ Front-end</a>
25 <li><a href="#x86-be">Known problems with the X86 Back-end</a>
Misha Brukmanadb1c392004-07-12 16:55:41 +0000[diff] [blame]26 <li><a href="#sparcv9-be">Known problems with the SparcV9 Back-end</a>
Chris Lattnerf32a5f52004-11-07 01:55:32 +0000[diff] [blame]27 <li><a href="#ppc-be">Known problems with the PowerPC Back-end</a>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]28 <li><a href="#c-be">Known problems with the C back-end</a>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]29 </ul></li>
30 <li><a href="#additionalinfo">Additional Information</a></li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]31</ol>
32
Chris Lattner7911ce22004-05-23 21:07:27 +0000[diff] [blame]33<div class="doc_author">
34 <p>Written by the <a href="http://llvm.cs.uiuc.edu">LLVM team</a><p>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]35</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]36
37<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]38<div class="doc_section">
39 <a name="intro">Introduction</a>
40</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]41<!-- *********************************************************************** -->
42
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]43<div class="doc_text">
44
45<p>This document contains the release notes for the LLVM compiler
Chris Lattner5c3389a2004-08-16 00:20:18 +0000[diff] [blame]46infrastructure, release 1.4. Here we describe the status of LLVM, including any
Chris Lattner7506b1d2004-12-07 08:04:13 +0000[diff] [blame^]47known problems and improvements from the previous release. The most up-to-date
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]48version of this document can be found on the <a
Chris Lattner5c3389a2004-08-16 00:20:18 +0000[diff] [blame]49href="http://llvm.cs.uiuc.edu/releases/1.4/">LLVM 1.4 web site</a>. If you are
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]50not reading this on the LLVM web pages, you should probably go there because
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]51this document may be updated after the release.</p>
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]52
Chris Lattner7506b1d2004-12-07 08:04:13 +0000[diff] [blame^]53<p>For more information about LLVM, including information about the latest
54release, please check out the <a href="http://llvm.cs.uiuc.edu">main LLVM
Chris Lattner47ad72c2003-10-07 21:38:31 +0000[diff] [blame]55web site</a>. If you have questions or comments, the <a
56href="http://mail.cs.uiuc.edu/mailman/listinfo/llvmdev">LLVM developer's mailing
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]57list</a> is a good place to send them.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]58
Chris Lattner9e848092003-12-12 04:25:33 +0000[diff] [blame]59<p>Note that if you are reading this file from CVS, this document applies
60to the <i>next</i> release, not the current one. To see the release notes for
61the current or previous releases, see the <a
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]62href="http://llvm.cs.uiuc.edu/releases/">releases page</a>.</p>
63
64</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]65
66<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]67<div class="doc_section">
68 <a name="whatsnew">What's New?</a>
69</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]70<!-- *********************************************************************** -->
71
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]72<div class="doc_text">
73
Chris Lattner5c3389a2004-08-16 00:20:18 +0000[diff] [blame]74<p>This is the fifth public release of the LLVM compiler infrastructure.</p>
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]75
Chris Lattner7506b1d2004-12-07 08:04:13 +0000[diff] [blame^]76<p> At this time, LLVM is known to correctly compile and a broad range of
77C and C++ programs, including the SPEC CPU95 &amp; 2000 suite. This release
78includes several major enhancements to the LLVM system, including a new
79PowerPC JIT, enhancements to the C/C++ front-end to provide source line number
80information in LLVM, a new <a href="CommandGuide/html/llvmc.html">compiler
81driver</a>, and several other enhancements listed below. It also includes
82bug fixes for those problems found since the 1.3 release.</p>
83
84<p>Note that this release seperates the LLVM Program Testsuite out of the
85main LLVM distribution into a seperate CVS repository and tarball. This
86reduces the size of the main LLVM distribution. Also note that LLVM now
87builds tools into llvm/Debug/bin by default instead of llvm/tools/Debug.</p>
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]88
Chris Lattner80453c92004-05-24 04:50:25 +0000[diff] [blame]89</div>
90
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]91<!--=========================================================================-->
92<div class="doc_subsubsection">
Chris Lattnera39719f2004-02-25 16:36:51 +0000[diff] [blame]93<a name="newfeatures">This release implements the following new features:</a>
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]94</div>
Chris Lattner47ad72c2003-10-07 21:38:31 +0000[diff] [blame]95
Chris Lattner80453c92004-05-24 04:50:25 +0000[diff] [blame]96<div class="doc_text">
Chris Lattner47ad72c2003-10-07 21:38:31 +0000[diff] [blame]97<ol>
Chris Lattner7506b1d2004-12-07 08:04:13 +0000[diff] [blame^]98 <li>LLVM now includes a Just-In-Time compiler for the PowerPC target.</li>
99 <li>llvmgcc and llvmg++ now emit source line number information when '-g' is
100 passed in. This information can be used with llvm-db or other tools and
101 passes.</li>
102 <li>The test/Programs hierarchy <a href="http://llvm.cs.uiuc.edu/PR257">has
103 been moved out of the main LLVM tree</a> into a separate CVS repository and
104 tarball. This shrinks the distribution size of LLVM itself significantly.
Reid Spencer6454ed32004-11-18 18:38:58 +0000[diff] [blame]105 </li>
Chris Lattner7506b1d2004-12-07 08:04:13 +0000[diff] [blame^]106 <li>LLVM now optimizes global variables more aggressively than it did
107 before.</li>
Reid Spencer4f86f9c2004-11-25 22:38:30 +0000[diff] [blame]108 <li>LLVM now includes the new '<tt>undef</tt>' value and
109 <a href="LangRef.html#i_unreachable"><tt>unreachable</tt></a> instruction,
110 which give the optimizer more information about the behavior of the
111 program.
112 </li>
Reid Spencer4f86f9c2004-11-25 22:38:30 +0000[diff] [blame]113 <li>Bytecode compression with bzip2 has been implemented. All bytecode files
114 generated by LLVM will now be compressed by default. Compression can be
115 disabled with the <tt>-disable-compression</tt> option to the tools that can
116 generate bytecode files.
117 </li>
Chris Lattner7506b1d2004-12-07 08:04:13 +0000[diff] [blame^]118 <li>A generic <a href="CommandGuide/html/llvmc.html">compiler driver</a>
119 (llvmc) and
120 an associated <a href="CommandGuide/html/llvm-ld.html">generic linker</a>
121 (llvm-ld) have been added. The compiler driver is generic because it can be
122 configured
Reid Spencer4f86f9c2004-11-25 22:38:30 +0000[diff] [blame]123 to pre-process, translate, optimize, assemble, and link code from any source
Chris Lattner7506b1d2004-12-07 08:04:13 +0000[diff] [blame^]124 language with an LLVM front-end. This makes it easier for compiler writers
125 to hide the multiple steps required to compile a program (compiling,
126 optimizing, linking runtime libraries, etc) in one simple command.
Reid Spencer4f86f9c2004-11-25 22:38:30 +0000[diff] [blame]127 </li>
128 <li>The <a href="http://llvm.cs.uiuc.edu/PR263">dependent libraries</a>
129 feature has been implemented. This allows front end compilers to indicate in
130 the bytecode which libraries the bytecode needs to be linked with. Both the
131 C/C++ front end and Stacker support generating the required libraries. The
Chris Lattner7506b1d2004-12-07 08:04:13 +0000[diff] [blame^]132 linker now supports using this information to ensure required libaries are
Reid Spencer4f86f9c2004-11-25 22:38:30 +0000[diff] [blame]133 linked into the module. This minimizes the need to use the <tt>-l</tt> option
134 when using <a href="CommandGuide/html/llvmc.html"><tt>llvmc</tt></a>
135 </li>
Chris Lattner7506b1d2004-12-07 08:04:13 +0000[diff] [blame^]136 <li>The LLVM makefiles have been improved to build LLVM much faster and
137 includes new targets (like dist-check, uninstall). One important user-visible
138 change is that libraries and tools will now be built into
139 <tt>$builddir/Debug/{bin,lib}</tt>
140 instead of <tt>$builddir/tools/Debug</tt> and <tt>$builddir/lib/Debug</tt>
141 (Similarly for <tt>Release</tt> and <tt>Profile</tt> builds).
Reid Spencer6454ed32004-11-18 18:38:58 +0000[diff] [blame]142 </li>
Chris Lattner7c8dd7f2004-11-17 18:19:32 +0000[diff] [blame]143 <li>The LLVM source code is much more compatible with Microsoft Visual C++,
Reid Spencer4f86f9c2004-11-25 22:38:30 +0000[diff] [blame]144 including the JIT and runtime-code generation, though the entire system
145 may not work with it.
146 </li>
Chris Lattner7506b1d2004-12-07 08:04:13 +0000[diff] [blame^]147 <li>The JIT-Target interfaces <a href="http://llvm.cs.uiuc.edu/PR283">are
Reid Spencer4f86f9c2004-11-25 22:38:30 +0000[diff] [blame]148 now much simpler</a> and more powerful.
149 </li>
Chris Lattner7506b1d2004-12-07 08:04:13 +0000[diff] [blame^]150 <li>LLVM now provides llvm-ar and llvm-ranlib tools for working with archives
151 of LLVM bytecode files.</li>
Chris Lattnera4bcecf2004-11-27 19:24:06 +0000[diff] [blame]152 <li>zlib and libpng are <a href="http://llvm.cs.uiuc.edu/PR417">no longer
153 included in the main LLVM tarball</a>.</li>
Chris Lattner7506b1d2004-12-07 08:04:13 +0000[diff] [blame^]154 <li>The LLVM code generator now automatically generates assembly code writers
155 from an abstract target descriptions, eliminating the need to write
156 assembly printers manually.</li>
Chris Lattnerb7c00752004-11-27 21:29:43 +0000[diff] [blame]157 <li>LLVM regression and feature tests can now be run with DejaGNU.</li>
Chris Lattnerd92017a2004-12-01 17:10:36 +0000[diff] [blame]158 <li>llvmgcc and llvmg++ now emit source-level line number information, making
159 it possible to map from LLVM code back to source. This is currently used
160 by llvm-db.</li>
Chris Lattner55ee0312003-11-19 22:05:38 +0000[diff] [blame]161</ol>
Chris Lattner0ef19062003-11-08 04:28:55 +0000[diff] [blame]162
Chris Lattner80453c92004-05-24 04:50:25 +0000[diff] [blame]163</div>
164
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]165
166<!--=========================================================================-->
167<div class="doc_subsubsection">
168In this release, the following missing features were implemented:
169</div>
Chris Lattner0ef19062003-11-08 04:28:55 +0000[diff] [blame]170
Chris Lattner80453c92004-05-24 04:50:25 +0000[diff] [blame]171<div class="doc_text">
172
Chris Lattner0ef19062003-11-08 04:28:55 +0000[diff] [blame]173<ol>
Reid Spencer6454ed32004-11-18 18:38:58 +0000[diff] [blame]174 <li><a href="http://llvm.cs.uiuc.edu/PR419">JIT interface should support
Reid Spencer4f86f9c2004-11-25 22:38:30 +0000[diff] [blame]175 arbitrary calls</a>
176 </li>
Reid Spencer6454ed32004-11-18 18:38:58 +0000[diff] [blame]177 <li>The <tt>llvm-ar</tt> tool was previously incomplete and didn't properly
178 support other ar(1) implementations. This has been corrected. <tt>llvm-ar</tt>
179 now fully supports all archive editing functions, table of contents listing,
180 extraction, and printing. It can also read BSD4.4/MacOSX and SVR4 style
Reid Spencer4f86f9c2004-11-25 22:38:30 +0000[diff] [blame]181 archives. See <a href="CommandGuide/html/llvm-ar.html">llvm-ar</a> for
182 details.
183 </li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]184</ol>
Chris Lattner47ad72c2003-10-07 21:38:31 +0000[diff] [blame]185
Chris Lattner80453c92004-05-24 04:50:25 +0000[diff] [blame]186</div>
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]187
188<!--=========================================================================-->
189<div class="doc_subsubsection">
Misha Brukmana7aadf12004-04-19 02:56:49 +0000[diff] [blame]190<a name="qualityofimp">In this release, the following Quality of Implementation
191issues were fixed:</a>
Chris Lattnere29ac162003-12-20 03:42:11 +0000[diff] [blame]192</div>
193
Chris Lattner80453c92004-05-24 04:50:25 +0000[diff] [blame]194<div class="doc_text">
195
Chris Lattnere29ac162003-12-20 03:42:11 +0000[diff] [blame]196<ol>
Chris Lattner7506b1d2004-12-07 08:04:13 +0000[diff] [blame^]197 <li>The linker no longer <a href="http://llvm.cs.uiuc.edu/PR426">emits many
198 useless warnings</a> when linking C++ programs.</a>
Reid Spencer4e69a5b2004-12-06 22:32:33 +0000[diff] [blame]199 </li>
Chris Lattner7506b1d2004-12-07 08:04:13 +0000[diff] [blame^]200 <li>The LLVM <a href="http://llvm.cs.uiuc.edu/PR352">#include namespace</a>
201 has been made consistent. Files in <tt>llvm/include/{Support,Config}</tt>
202 are now located in <tt>llvm/include/llvm/{Support,Config}</tt>.</a>
Reid Spencer4f86f9c2004-11-25 22:38:30 +0000[diff] [blame]203 </li>
Reid Spencerccbc9cf2004-11-22 18:40:51 +0000[diff] [blame]204 <li>The names of the libraries generated by compiling LLVM source have been
205 changed to ensure they do not conflict with other packages upon installation.
206 Each LLVM library is now prefixed with LLVM and uses mixed clase. For example,
207 the library <tt>libasmparser.a</tt> in 1.3 has become
Reid Spencer4f86f9c2004-11-25 22:38:30 +0000[diff] [blame]208 <tt>libLLVMAsmParser.a</tt> in release 1.4.
209 </li>
Chris Lattner7506b1d2004-12-07 08:04:13 +0000[diff] [blame^]210 <li>The C++ frontend no longer expands and emits <a
211 href="http://llvm.cs.uiuc.edu/PR459">all inline functions, even if they
212 are unused</a>. It now properly tracks which functions are needed and
213 only compiles those.</li>
Chris Lattnere29ac162003-12-20 03:42:11 +0000[diff] [blame]214
Chris Lattner7506b1d2004-12-07 08:04:13 +0000[diff] [blame^]215 <li>Many improvements in the <a href="http://llvm.cs.uiuc.edu/PR256">autoconf
216 and makefile systems</a> have been implemented.</li>
Brian Gaeke6b31beb2004-01-16 21:55:04 +0000[diff] [blame]217</ol>
Chris Lattner80453c92004-05-24 04:50:25 +0000[diff] [blame]218</div>
Brian Gaeke6b31beb2004-01-16 21:55:04 +0000[diff] [blame]219
220<!--=========================================================================-->
221<div class="doc_subsubsection">
Chris Lattner6e1ef192004-05-02 04:19:15 +0000[diff] [blame]222<a name="codequality">This release includes the following Code Quality
223improvements:</a>
Chris Lattneraab56d42004-05-23 20:42:08 +0000[diff] [blame]224</div>
Chris Lattner89ca2b82003-10-27 17:06:39 +0000[diff] [blame]225
Chris Lattner80453c92004-05-24 04:50:25 +0000[diff] [blame]226<div class="doc_text">
Chris Lattner89ca2b82003-10-27 17:06:39 +0000[diff] [blame]227<ol>
Chris Lattner7506b1d2004-12-07 08:04:13 +0000[diff] [blame^]228 <li>The optimizer produces <a href="http://llvm.cs.uiuc.edu/PR362">more
229 efficient code for std::min/std::max</a> and other similar functions.</li>
230 <li>The X86 backend generates substantially faster code for floating point
231 intensive programs.</li>
232 <li>The PowerPC backend generates more efficient code in many common
233 scenarios.</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]234</ol>
Reid Spencer8e0262f2004-05-23 17:23:13 +0000[diff] [blame]235</div>
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]236
237<!--=========================================================================-->
238<div class="doc_subsubsection">
Misha Brukmana7aadf12004-04-19 02:56:49 +0000[diff] [blame]239<a name="bugfix">In this release, the following bugs in the previous release
240were fixed:</a>
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]241</div>
242
Chris Lattner80453c92004-05-24 04:50:25 +0000[diff] [blame]243<div class="doc_text">
244
Chris Lattnerd5713882004-08-02 20:28:44 +0000[diff] [blame]245<p>Bugs fixed in the LLVM Core:</p>
Chris Lattner47ad72c2003-10-07 21:38:31 +0000[diff] [blame]246
247<ol>
Reid Spencer4f86f9c2004-11-25 22:38:30 +0000[diff] [blame]248 <li><a href="http://llvm.cs.uiuc.edu/PR420">[licm] LICM invalidates alias
249 analysis info and uses broken information</a> (optimizer crash)</li>
250 <li><a href="http://llvm.cs.uiuc.edu/PR422">[asmwriter] Asmwriter is really
251 slow for functions with lots of values</a></li>
252 <li><a href="http://llvm.cs.uiuc.edu/PR423">[anders-aa] Andersen's AA is
253 completely broken in LLVM 1.3</a></li>
254 <li><a href="http://llvm.cs.uiuc.edu/PR430">[bcwriter] Empty compaction
255 tables defined</a></li>
Chris Lattner7506b1d2004-12-07 08:04:13 +0000[diff] [blame^]256 <li><a href="http://llvm.cs.uiuc.edu/PR227">[X86] llc output for functions
257 w/certain names tickles GNU 'as' bugs</a></li>
Chris Lattner14d6b752004-12-03 17:21:33 +0000[diff] [blame]258 <li><a href="http://llvm.cs.uiuc.edu/PR472">[cbackend] Static globals are
259 prototyped as 'extern'</a></li>
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]260</ol>
261
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]262<p>Bugs in the C/C++ front-end:</p>
263
264<ol>
Reid Spencer4f86f9c2004-11-25 22:38:30 +0000[diff] [blame]265 <li><a href="http://llvm.cs.uiuc.edu/PR445">[llvmg++] not enough templates are
266 instantiated</a></li>
267 <li><a href="http://llvm.cs.uiuc.edu/PR450">[llvmg++] Extern const globals
268 cannot be marked 'constant' if they have nontrivial ctors or dtors</a></li>
269 <li><a href="http://llvm.cs.uiuc.edu/PR461">[llvmgcc] Crash compiling unnamed
Chris Lattner4df69b82004-11-25 06:31:42 +0000[diff] [blame]270 bitfield which does not increase struct size</a></li>
Chris Lattner748e58b2004-11-27 19:50:58 +0000[diff] [blame]271 <li><a href="http://llvm.cs.uiuc.edu/PR424">[llvmgcc] llvmgcc emits invalid
272 constant exprs</a></li>
Chris Lattner7506b1d2004-12-07 08:04:13 +0000[diff] [blame^]273 <li><a href="http://llvm.cs.uiuc.edu/PR421">[llvmg++] Crash initializing
Chris Lattner0db649c2004-11-27 22:47:08 +0000[diff] [blame]274 array with constructors in hard EH situations</a></li>
Chris Lattnereeeff012004-11-27 23:27:26 +0000[diff] [blame]275 <li><a href="http://llvm.cs.uiuc.edu/PR397">[llvm-gcc] Inline function
276 redefinitions error due to 'asm' function rename</a></li>
Chris Lattner87c74b72004-11-28 00:43:59 +0000[diff] [blame]277 <li><a href="http://llvm.cs.uiuc.edu/PR244">[llvm-gcc] Error when an
Chris Lattner9b5d3952004-11-28 00:09:38 +0000[diff] [blame]278 implicitly external function is re-declared as static</a></li>
Chris Lattner87c74b72004-11-28 00:43:59 +0000[diff] [blame]279 <li><a href="http://llvm.cs.uiuc.edu/PR360">[llvmgcc] Structure field with
280 non-constant offset crashes llvmgcc</a></li>
Chris Lattner04cf0c22004-11-28 01:25:20 +0000[diff] [blame]281 <li><a href="http://llvm.cs.uiuc.edu/PR447">[llvmg++] Crash compiling
282 friend with default argument</a></li>
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]283</ol>
Brian Gaekee77c8e72004-08-24 07:43:48 +0000[diff] [blame]284
285<p>Bugs fixed in the Sparc V9 back-end:</p>
286
287<ol>
Reid Spencer4f86f9c2004-11-25 22:38:30 +0000[diff] [blame]288 <li><a href="http://llvm.cs.uiuc.edu/PR428">[sparcv9] regalloc assertion
Brian Gaekee77c8e72004-08-24 07:43:48 +0000[diff] [blame]289 failure with certain indirect calls</a></li>
290</ol>
291
Chris Lattner80453c92004-05-24 04:50:25 +0000[diff] [blame]292</div>
Reid Spencer8e0262f2004-05-23 17:23:13 +0000[diff] [blame]293
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]294<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]295<div class="doc_section">
296 <a name="portability">Portability and Supported Platforms</a>
297</div>
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]298<!-- *********************************************************************** -->
299
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]300<div class="doc_text">
301
Chris Lattner4654bdb2004-06-01 18:22:41 +0000[diff] [blame]302<p>LLVM is known to work in the following platforms:</p>
303
304<ul>
305<li>Intel and AMD machines running Red Hat Linux and FreeBSD (and probably
306 other unix-like systems).</li>
307<li>Sun UltraSPARC workstations running Solaris 8.</li>
Chris Lattner7506b1d2004-12-07 08:04:13 +0000[diff] [blame^]308<li>Intel and AMD machines running on Win32 with the Cygwin libraries (limited
309 support is available for native builds with Visual C++).</li>
310<li>PowerPC-based Mac OS X systems, running 10.2 and above.</li>
Chris Lattner4654bdb2004-06-01 18:22:41 +0000[diff] [blame]311</ul>
312
Brian Gaekeb0fd7612004-05-09 05:28:35 +0000[diff] [blame]313<p>The core LLVM infrastructure uses
314<a href="http://www.gnu.org/software/autoconf/">GNU autoconf</a> to adapt itself
315to the machine and operating system on which it is built. However, minor
316porting may be required to get LLVM to work on new platforms. We welcome your
317portability patches and reports of successful builds or error messages.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]318
Chris Lattner7506b1d2004-12-07 08:04:13 +0000[diff] [blame^]319<!--
Chris Lattner4654bdb2004-06-01 18:22:41 +0000[diff] [blame]320<p>Note that the LLVM build system does not currently support directories with
321spaces on them when running on Win32/cygwin. We strongly recommend running
322LLVM and the C frontend out of a top-level directory without spaces (e.g.,
Chris Lattner74032a52004-06-01 19:41:30 +0000[diff] [blame]323<tt>/cygdrive/c/llvm</tt>). Also, make sure to install <b>all</b> of the
324cygwin packages. By default, many important tools are not installed that
Chris Lattner5aff3552004-08-16 20:20:46 +0000[diff] [blame]325are needed by the LLVM build process or test suite (e.g., /bin/time). Finally,
326please make sure that there are no directories with spaces in them in your
327PATH environment variable.</p>
Chris Lattner7506b1d2004-12-07 08:04:13 +0000[diff] [blame^]328-->
Chris Lattner4654bdb2004-06-01 18:22:41 +0000[diff] [blame]329
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]330</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]331
332<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]333<div class="doc_section">
334 <a name="knownproblems">Known Problems</a>
335</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]336<!-- *********************************************************************** -->
337
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]338<div class="doc_text">
339
340<p>This section contains all known problems with the LLVM system, listed by
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]341component. As new problems are discovered, they will be added to these
Chris Lattner5eccca42003-12-12 21:22:16 +0000[diff] [blame]342sections. If you run into a problem, please check the <a
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]343href="http://llvm.cs.uiuc.edu/bugs/">LLVM bug database</a> and submit a bug if
Chris Lattner5eccca42003-12-12 21:22:16 +0000[diff] [blame]344there isn't already one.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]345
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]346</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]347
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]348<!-- ======================================================================= -->
349<div class="doc_subsection">
350 <a name="experimental">Experimental features included with this release</a>
351</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]352
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]353<div class="doc_text">
354
Misha Brukman6df9e2c2004-05-12 21:46:05 +0000[diff] [blame]355<p>The following components of this LLVM release are either untested, known to
356be broken or unreliable, or are in early development. These components should
357not be relied on, and bugs should not be filed against them, but they may be
358useful to some people. In particular, if you would like to work on one of these
359components, please contact us on the llvmdev list.</p>
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]360
361<ul>
Chris Lattner7506b1d2004-12-07 08:04:13 +0000[diff] [blame^]362<li>The following passes are incomplete or buggy, and may be removed in future
363 releases: <tt>-pgmdep, -memdep, -ipmodref, -cee, -branch-combine,
364 -instloops, -paths, -pre</tt></li>
365<li>The <tt>llvm-db</tt> tool is in a very early stage of development, but can
366 be used to step through programs and inspect the stack.</li>
Chris Lattner0da7f492004-12-02 17:20:17 +0000[diff] [blame]367<li>The "iterative scan" register allocator (enabled with -regalloc=iterativescan)
368 is not stable.</li>
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]369</ul>
370
371</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]372
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]373<!-- ======================================================================= -->
374<div class="doc_subsection">
375 <a name="core">Known problems with the LLVM Core</a>
376</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]377
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]378<div class="doc_text">
379
380<ul>
Reid Spencer4f86f9c2004-11-25 22:38:30 +0000[diff] [blame]381 <li>In the JIT, <tt>dlsym</tt> on a symbol compiled by the JIT will not work.
382 </li>
383 <li>The JIT does not use mutexes to protect its internal data structures. As
384 such, execution of a threaded program could cause these data structures to be
385 corrupted.
386 </li>
Reid Spencer4f86f9c2004-11-25 22:38:30 +0000[diff] [blame]387 <li><a href="http://llvm.cs.uiuc.edu/PR240">The lower-invoke pass does not
388 mark values live across a setjmp as volatile</a>. This missing feature
389 only affects targets whose setjmp/longjmp libraries do not save and restore
390 the entire register file.</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]391</ul>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]392</div>
393
394<!-- ======================================================================= -->
395<div class="doc_subsection">
396 <a name="c-fe">Known problems with the C front-end</a>
397</div>
Chris Lattner47588f92003-10-02 05:07:23 +0000[diff] [blame]398
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]399<!-- _______________________________________________________________________ -->
Chris Lattnerb40efb32003-12-14 05:03:43 +0000[diff] [blame]400<div class="doc_subsubsection">Bugs</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]401
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]402<div class="doc_text">
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]403<ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]404<li>C99 Variable sized arrays do not release stack memory when they go out of
405 scope. Thus, the following program may run out of stack space:
406<pre>
407 for (i = 0; i != 1000000; ++i) {
408 int X[n];
409 foo(X);
410 }
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]411</pre></li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]412
Misha Brukman6df9e2c2004-05-12 21:46:05 +0000[diff] [blame]413<li>Initialization of global union variables can only be done <a
Misha Brukman43ee2932004-12-04 00:45:09 +0000[diff] [blame]414href="http://llvm.cs.uiuc.edu/PR162">with the largest union member</a>.</li>
Chris Lattnerf580cdc2004-03-16 21:39:04 +0000[diff] [blame]415
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]416</ul>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]417</div>
418
419<!-- _______________________________________________________________________ -->
420<div class="doc_subsubsection">
421 Notes
422</div>
423
424<div class="doc_text">
425
426<ul>
427
428<li>Inline assembly is not yet supported.</li>
Chris Lattnere01fcfb2003-10-27 18:30:37 +0000[diff] [blame]429
430<li>"long double" is transformed by the front-end into "double". There is no
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]431support for floating point data types of any size other than 32 and 64
432bits.</li>
433
434<li>The following Unix system functionality has not been tested and may not
435work:
Misha Brukmane0c891c2003-11-22 01:00:11 +0000[diff] [blame]436 <ol>
437 <li><tt>sigsetjmp</tt>, <tt>siglongjmp</tt> - These are not turned into the
438 appropriate <tt>invoke</tt>/<tt>unwind</tt> instructions. Note that
439 <tt>setjmp</tt> and <tt>longjmp</tt> <em>are</em> compiled correctly.
440 <li><tt>getcontext</tt>, <tt>setcontext</tt>, <tt>makecontext</tt>
441 - These functions have not been tested.
442 </ol></li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]443
444<li>Although many GCC extensions are supported, some are not. In particular,
445 the following extensions are known to <b>not be</b> supported:
446 <ol>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]447 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Local-Labels.html#Local%20Labels">Local Labels</a>: Labels local to a block.</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]448 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Nested-Functions.html#Nested%20Functions">Nested Functions</a>: As in Algol and Pascal, lexical scoping of functions.</li>
449 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Constructing-Calls.html#Constructing%20Calls">Constructing Calls</a>: Dispatching a call to another function.</li>
450 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Extended-Asm.html#Extended%20Asm">Extended Asm</a>: Assembler instructions with C expressions as operands.</li>
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]451 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Constraints.html#Constraints">Constraints</a>: Constraints for asm operands.</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]452 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Asm-Labels.html#Asm%20Labels">Asm Labels</a>: Specifying the assembler name to use for a C symbol.</li>
453 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Explicit-Reg-Vars.html#Explicit%20Reg%20Vars">Explicit Reg Vars</a>: Defining variables residing in specified registers.</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]454 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Vector-Extensions.html#Vector%20Extensions">Vector Extensions</a>: Using vector instructions through built-in functions.</li>
455 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Target-Builtins.html#Target%20Builtins">Target Builtins</a>: Built-in functions specific to particular targets.</li>
456 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Thread-Local.html#Thread-Local">Thread-Local</a>: Per-thread variables.</li>
457 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Pragmas.html#Pragmas">Pragmas</a>: Pragmas accepted by GCC.</li>
Misha Brukmane0c891c2003-11-22 01:00:11 +0000[diff] [blame]458 </ol>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]459
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]460 <p>The following GCC extensions are <b>partially</b> supported. An ignored
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]461 attribute means that the LLVM compiler ignores the presence of the attribute,
462 but the code should still work. An unsupported attribute is one which is
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]463 ignored by the LLVM compiler and will cause a different interpretation of
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]464 the program.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]465
466 <ol>
467 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Variable-Length.html#Variable%20Length">Variable Length</a>:
468 Arrays whose length is computed at run time.<br>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]469 Supported, but allocated stack space is not freed until the function returns (noted above).</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]470
471 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Function-Attributes.html#Function%20Attributes">Function Attributes</a>:
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]472
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]473 Declaring that functions have no side effects or that they can never
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]474 return.<br>
475
476 <b>Supported:</b> <tt>format</tt>, <tt>format_arg</tt>, <tt>non_null</tt>,
477 <tt>constructor</tt>, <tt>destructor</tt>, <tt>unused</tt>,
478 <tt>deprecated</tt>, <tt>warn_unused_result</tt>, <tt>weak</tt><br>
479
480 <b>Ignored:</b> <tt>noreturn</tt>, <tt>noinline</tt>,
481 <tt>always_inline</tt>, <tt>pure</tt>, <tt>const</tt>, <tt>nothrow</tt>,
482 <tt>malloc</tt>, <tt>no_instrument_function</tt>, <tt>cdecl</tt><br>
483
484 <b>Unsupported:</b> <tt>used</tt>, <tt>section</tt>, <tt>alias</tt>,
485 <tt>visibility</tt>, <tt>regparm</tt>, <tt>stdcall</tt>,
486 <tt>fastcall</tt>, all other target specific attributes</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]487
488 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Variable-Attributes.html#Variable%20Attributes">Variable Attributes</a>:
489 Specifying attributes of variables.<br>
490 <b>Supported:</b> <tt>cleanup</tt>, <tt>common</tt>, <tt>nocommon</tt>,
491 <tt>deprecated</tt>, <tt>transparent_union</tt>,
492 <tt>unused</tt>, <tt>weak</tt><br>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]493
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]494 <b>Unsupported:</b> <tt>aligned</tt>, <tt>mode</tt>, <tt>packed</tt>,
495 <tt>section</tt>, <tt>shared</tt>, <tt>tls_model</tt>,
496 <tt>vector_size</tt>, <tt>dllimport</tt>,
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]497 <tt>dllexport</tt>, all target specific attributes.</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]498
Misha Brukmanc4b7bee2003-12-12 04:37:31 +0000[diff] [blame]499 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Type-Attributes.html#Type%20Attributes">Type Attributes</a>: Specifying attributes of types.<br>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]500 <b>Supported:</b> <tt>transparent_union</tt>, <tt>unused</tt>,
Misha Brukmanc4b7bee2003-12-12 04:37:31 +0000[diff] [blame]501 <tt>deprecated</tt>, <tt>may_alias</tt><br>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]502
503 <b>Unsupported:</b> <tt>aligned</tt>, <tt>packed</tt>,
504 all target specific attributes.</li>
505
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]506 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Other-Builtins.html#Other%20Builtins">Other Builtins</a>:
507 Other built-in functions.<br>
508 We support all builtins which have a C language equivalent (e.g.,
509 <tt>__builtin_cos</tt>), <tt>__builtin_alloca</tt>,
510 <tt>__builtin_types_compatible_p</tt>, <tt>__builtin_choose_expr</tt>,
Chris Lattnerceebeb62004-06-18 06:26:29 +0000[diff] [blame]511 <tt>__builtin_constant_p</tt>, and <tt>__builtin_expect</tt>
512 (currently ignored). We also support builtins for ISO C99 floating
513 point comparison macros (e.g., <tt>__builtin_islessequal</tt>).</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]514 </ol>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]515
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]516 <p>The following extensions <b>are</b> known to be supported:</p>
517
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]518 <ol>
Chris Lattner7fe97dd2004-03-16 08:54:07 +0000[diff] [blame]519 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Labels-as-Values.html#Labels%20as%20Values">Labels as Values</a>: Getting pointers to labels and computed gotos.</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]520 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html#Statement%20Exprs">Statement Exprs</a>: Putting statements and declarations inside expressions.</li>
521 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Typeof.html#Typeof">Typeof</a>: <code>typeof</code>: referring to the type of an expression.</li>
Tanya Lattnerca26c3e2004-06-22 03:48:17 +0000[diff] [blame]522 <li><a href="http://gcc.gnu.org/onlinedocs/gcc-3.4.0/gcc/Lvalues.html#Lvalues">Lvalues</a>: Using <code>?:</code>, "<code>,</code>" and casts in lvalues.</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]523 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Conditionals.html#Conditionals">Conditionals</a>: Omitting the middle operand of a <code>?:</code> expression.</li>
524 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Long-Long.html#Long%20Long">Long Long</a>: Double-word integers.</li>
525 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Complex.html#Complex">Complex</a>: Data types for complex numbers.</li>
526 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Hex-Floats.html#Hex%20Floats">Hex Floats</a>:Hexadecimal floating-point constants.</li>
527 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html#Zero%20Length">Zero Length</a>: Zero-length arrays.</li>
528 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Empty-Structures.html#Empty%20Structures">Empty Structures</a>: Structures with no members.</li>
529 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Variadic-Macros.html#Variadic%20Macros">Variadic Macros</a>: Macros with a variable number of arguments.</li>
530 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Escaped-Newlines.html#Escaped%20Newlines">Escaped Newlines</a>: Slightly looser rules for escaped newlines.</li>
531 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Subscripting.html#Subscripting">Subscripting</a>: Any array can be subscripted, even if not an lvalue.</li>
Misha Brukmanc4b7bee2003-12-12 04:37:31 +0000[diff] [blame]532 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Pointer-Arith.html#Pointer%20Arith">Pointer Arith</a>: Arithmetic on <code>void</code>-pointers and function pointers.</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]533 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Initializers.html#Initializers">Initializers</a>: Non-constant initializers.</li>
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]534 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Compound-Literals.html#Compound%20Literals">Compound Literals</a>: Compound literals give structures, unions,
535or arrays as values.</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]536 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Designated-Inits.html#Designated%20Inits">Designated Inits</a>: Labeling elements of initializers.</li>
Misha Brukmanc4b7bee2003-12-12 04:37:31 +0000[diff] [blame]537 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Cast-to-Union.html#Cast%20to%20Union">Cast to Union</a>: Casting to union type from any member of the union.</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]538 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Case-Ranges.html#Case%20Ranges">Case Ranges</a>: `case 1 ... 9' and such.</li>
539 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Mixed-Declarations.html#Mixed%20Declarations">Mixed Declarations</a>: Mixing declarations and code.</li>
540 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Function-Prototypes.html#Function%20Prototypes">Function Prototypes</a>: Prototype declarations and old-style definitions.</li>
541 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/C---Comments.html#C++%20Comments">C++ Comments</a>: C++ comments are recognized.</li>
542 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Dollar-Signs.html#Dollar%20Signs">Dollar Signs</a>: Dollar sign is allowed in identifiers.</li>
543 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Character-Escapes.html#Character%20Escapes">Character Escapes</a>: <code>\e</code> stands for the character &lt;ESC&gt;.</li>
544 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Alignment.html#Alignment">Alignment</a>: Inquiring about the alignment of a type or variable.</li>
545 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Inline.html#Inline">Inline</a>: Defining inline functions (as fast as macros).</li>
546 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Alternate-Keywords.html#Alternate%20Keywords">Alternate Keywords</a>:<code>__const__</code>, <code>__asm__</code>, etc., for header files.</li>
547 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Incomplete-Enums.html#Incomplete%20Enums">Incomplete Enums</a>: <code>enum foo;</code>, with details to follow.</li>
548 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Function-Names.html#Function%20Names">Function Names</a>: Printable strings which are the name of the current function.</li>
Chris Lattner25795bc2004-02-14 04:08:29 +0000[diff] [blame]549 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Return-Address.html#Return%20Address">Return Address</a>: Getting the return or frame address of a function.</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]550 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Unnamed-Fields.html#Unnamed%20Fields">Unnamed Fields</a>: Unnamed struct/union fields within structs/unions.</li>
551 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Attribute-Syntax.html#Attribute%20Syntax">Attribute Syntax</a>: Formal syntax for attributes.</li>
Misha Brukmane0c891c2003-11-22 01:00:11 +0000[diff] [blame]552 </ol></li>
553
554</ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]555
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]556<p>If you run into GCC extensions which have not been included in any of these
557lists, please let us know (also including whether or not they work).</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]558
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]559</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]560
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]561<!-- ======================================================================= -->
562<div class="doc_subsection">
563 <a name="c++-fe">Known problems with the C++ front-end</a>
564</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]565
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]566<div class="doc_text">
567
Chris Lattner7506b1d2004-12-07 08:04:13 +0000[diff] [blame^]568<p>For this release, the C++ front-end is considered to be fully. It has been
569tested and works for a number of non-trivial programs, including LLVM
570itself.</p>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]571
572</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]573
574<!-- _______________________________________________________________________ -->
Chris Lattner3a51be12004-02-14 04:12:41 +0000[diff] [blame]575<div class="doc_subsubsection">Bugs</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]576
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]577<div class="doc_text">
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]578
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]579<ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]580<li>The C++ front-end inherits all problems afflicting the <a href="#c-fe">C
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]581 front-end</a>.</li>
Chris Lattner7962f712004-07-17 02:04:41 +0000[diff] [blame]582
Chris Lattnerd5713882004-08-02 20:28:44 +0000[diff] [blame]583<li><b>IA-64 specific</b>: The C++ front-end does not use <a
584href="http://llvm.cs.uiuc.edu/PR406">IA64 ABI compliant layout of v-tables</a>.
Chris Lattner7962f712004-07-17 02:04:41 +0000[diff] [blame]585In particular, it just stores function pointers instead of function
586descriptors in the vtable. This bug prevents mixing C++ code compiled with
Chris Lattner04db8082004-08-02 20:29:51 +0000[diff] [blame]587LLVM with C++ objects compiled by other C++ compilers.</li>
Chris Lattner7962f712004-07-17 02:04:41 +0000[diff] [blame]588
Chris Lattnerd5713882004-08-02 20:28:44 +0000[diff] [blame]589</ul>
590
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]591</div>
592
593<!-- _______________________________________________________________________ -->
594<div class="doc_subsubsection">
595 Notes
596</div>
597
598<div class="doc_text">
599
600<ul>
Chris Lattnere01fcfb2003-10-27 18:30:37 +0000[diff] [blame]601
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]602<li>The C++ front-end is based on a pre-release of the GCC 3.4 C++ parser. This
603parser is significantly more standards compliant (and picky) than prior GCC
604versions. For more information, see the C++ section of the <a
Chris Lattner9e848092003-12-12 04:25:33 +0000[diff] [blame]605href="http://gcc.gnu.org/gcc-3.4/changes.html">GCC 3.4 release notes</a>.</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]606
607<li>Destructors for local objects are not always run when a <tt>longjmp</tt> is
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]608 performed. In particular, destructors for objects in the <tt>longjmp</tt>ing
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]609 function and in the <tt>setjmp</tt> receiver function may not be run.
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]610 Objects in intervening stack frames will be destroyed, however (which is
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]611 better than most compilers).</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]612
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]613<li>The LLVM C++ front-end follows the <a
614 href="http://www.codesourcery.com/cxx-abi">Itanium C++ ABI</a>.
615 This document, which is not Itanium specific, specifies a standard for name
616 mangling, class layout, v-table layout, RTTI formats, and other C++
617 representation issues. Because we use this API, code generated by the LLVM
618 compilers should be binary compatible with machine code generated by other
619 Itanium ABI C++ compilers (such as G++, the Intel and HP compilers, etc).
620 <i>However</i>, the exception handling mechanism used by LLVM is very
621 different from the model used in the Itanium ABI, so <b>exceptions will not
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]622 interact correctly</b>. </li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]623
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]624</ul>
Chris Lattnerfcc54b32003-10-07 22:14:37 +0000[diff] [blame]625
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]626</div>
627
628<!-- ======================================================================= -->
629<div class="doc_subsection">
630 <a name="x86-be">Known problems with the X86 back-end</a>
631</div>
632
633<div class="doc_text">
634
635<ul>
Chris Lattnerd5713882004-08-02 20:28:44 +0000[diff] [blame]636 <li>none yet</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]637</ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]638
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]639</div>
640
641<!-- ======================================================================= -->
642<div class="doc_subsection">
Misha Brukmanadb1c392004-07-12 16:55:41 +0000[diff] [blame]643 <a name="sparcv9-be">Known problems with the SparcV9 back-end</a>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]644</div>
645
646<div class="doc_text">
647
648<ul>
Misha Brukmanadb1c392004-07-12 16:55:41 +0000[diff] [blame]649<li><a href="http://llvm.cs.uiuc.edu/PR60">[sparcv9] SparcV9 backend miscompiles
650several programs in the LLVM test suite</a></li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]651</ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]652
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]653</div>
654
655<!-- ======================================================================= -->
656<div class="doc_subsection">
Chris Lattnerf32a5f52004-11-07 01:55:32 +0000[diff] [blame]657 <a name="ppc-be">Known problems with the PowerPC back-end</a>
658</div>
659
660<div class="doc_text">
661
662<ul>
663<li>none yet</li>
664</ul>
665
666</div>
667
668<!-- ======================================================================= -->
669<div class="doc_subsection">
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]670 <a name="c-be">Known problems with the C back-end</a>
671</div>
672
673<div class="doc_text">
674
675<ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]676
677<li>The C back-end produces code that violates the ANSI C Type-Based Alias
678Analysis rules. As such, special options may be necessary to compile the code
679(for example, GCC requires the <tt>-fno-strict-aliasing</tt> option). This
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]680problem probably cannot be fixed.</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]681
Chris Lattner2855ecd2003-11-04 20:06:53 +0000[diff] [blame]682<li><a href="http://llvm.cs.uiuc.edu/PR56">Zero arg vararg functions are not
Chris Lattner2af46052003-10-24 04:03:19 +0000[diff] [blame]683supported</a>. This should not affect LLVM produced by the C or C++
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]684frontends.</li>
Chris Lattner2af46052003-10-24 04:03:19 +0000[diff] [blame]685
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]686</ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]687
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]688</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]689
690<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]691<div class="doc_section">
692 <a name="additionalinfo">Additional Information</a>
693</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]694<!-- *********************************************************************** -->
695
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]696<div class="doc_text">
697
698<p>A wide variety of additional information is available on the LLVM web page,
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]699including mailing lists and publications describing algorithms and components
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]700implemented in LLVM. The web page also contains versions of the API
701documentation which is up-to-date with the CVS version of the source code. You
702can access versions of these documents specific to this release by going into
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]703the "<tt>llvm/doc/</tt>" directory in the LLVM tree.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]704
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]705<p>If you have any questions or comments about LLVM, please feel free to contact
Chris Lattner5eccca42003-12-12 21:22:16 +0000[diff] [blame]706us via the <a href="http://mail.cs.uiuc.edu/mailman/listinfo/llvmdev">mailing
707lists</a>.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]708
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]709</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]710
711<!-- *********************************************************************** -->
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]712
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]713<hr>
Misha Brukman2061e892003-11-22 01:23:39 +0000[diff] [blame]714<address>
Misha Brukman38847d52003-12-21 22:53:21 +0000[diff] [blame]715 <a href="http://jigsaw.w3.org/css-validator/check/referer"><img
Misha Brukman2061e892003-11-22 01:23:39 +0000[diff] [blame]716 src="http://jigsaw.w3.org/css-validator/images/vcss" alt="Valid CSS!"></a>
717 <a href="http://validator.w3.org/check/referer"><img
718 src="http://www.w3.org/Icons/valid-html401" alt="Valid HTML 4.01!" /></a>
719
Misha Brukmane0c891c2003-11-22 01:00:11 +0000[diff] [blame]720 <a href="http://llvm.cs.uiuc.edu">The LLVM Compiler Infrastructure</a><br>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]721 Last modified: $Date$
Misha Brukman2061e892003-11-22 01:23:39 +0000[diff] [blame]722</address>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]723
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]724</body>
725</html>