Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 1 | <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" |
| 2 | "http://www.w3.org/TR/html4/strict.dtd"> |
| 3 | <html> |
| 4 | <head> |
| 5 | <link rel="stylesheet" href="llvm.css" type="text/css"> |
Chris Lattner | b40efb3 | 2003-12-14 05:03:43 +0000 | [diff] [blame] | 6 | <title>LLVM 1.2 Release Notes</title> |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 7 | </head> |
| 8 | <body> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 9 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 10 | <div class="doc_title"> |
Chris Lattner | b40efb3 | 2003-12-14 05:03:43 +0000 | [diff] [blame] | 11 | LLVM 1.2 Release Notes |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 12 | </div> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 13 | |
| 14 | <ol> |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 15 | <li><a href="#intro">Introduction</a></li> |
| 16 | <li><a href="#whatsnew">What's New?</a></li> |
| 17 | <li><a href="#portability">Portability and Supported Platforms</a></li> |
| 18 | <li><a href="#install-instructions">Installation Instructions</a></li> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 19 | <li><a href="#knownproblems">Known Problems</a> |
| 20 | <ul> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 21 | <li><a href="#core">Known problems with the LLVM Core</a> |
| 22 | <li><a href="#c-fe">Known problems with the C Front-end</a> |
| 23 | <li><a href="#c++-fe">Known problems with the C++ Front-end</a> |
| 24 | <li><a href="#x86-be">Known problems with the X86 Back-end</a> |
| 25 | <li><a href="#sparc-be">Known problems with the Sparc Back-end</a> |
| 26 | <li><a href="#c-be">Known problems with the C back-end</a> |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 27 | </ul></li> |
| 28 | <li><a href="#additionalinfo">Additional Information</a></li> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 29 | </ol> |
| 30 | |
Misha Brukman | e0c891c | 2003-11-22 01:00:11 +0000 | [diff] [blame] | 31 | <div class="doc_text"> |
John Criswell | d000e1d | 2003-12-18 16:43:17 +0000 | [diff] [blame^] | 32 | <p><b>Written by the <a href="http://llvm.cs.uiuc.edu">LLVM team</a></b><p> |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 33 | </div> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 34 | |
| 35 | <!-- *********************************************************************** --> |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 36 | <div class="doc_section"> |
| 37 | <a name="intro">Introduction</a> |
| 38 | </div> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 39 | <!-- *********************************************************************** --> |
| 40 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 41 | <div class="doc_text"> |
| 42 | |
| 43 | <p>This document contains the release notes for the LLVM compiler |
Chris Lattner | b40efb3 | 2003-12-14 05:03:43 +0000 | [diff] [blame] | 44 | infrastructure, release 1.2. Here we describe the status of LLVM, including any |
John Criswell | d000e1d | 2003-12-18 16:43:17 +0000 | [diff] [blame^] | 45 | known problems and bug fixes from the previous release. The most up-to-date |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 46 | version of this document can be found on the <a |
Chris Lattner | b40efb3 | 2003-12-14 05:03:43 +0000 | [diff] [blame] | 47 | href="http://llvm.cs.uiuc.edu/releases/1.2/">LLVM 1.2 web site</a>. If you are |
John Criswell | d000e1d | 2003-12-18 16:43:17 +0000 | [diff] [blame^] | 48 | not reading this on the LLVM web pages, you should probably go there because |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 49 | this document may be updated after the release.</p> |
Chris Lattner | 1909261 | 2003-10-02 16:38:05 +0000 | [diff] [blame] | 50 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 51 | <p>For more information about LLVM, including information about potentially more |
Chris Lattner | 47ad72c | 2003-10-07 21:38:31 +0000 | [diff] [blame] | 52 | current releases, please check out the <a href="http://llvm.cs.uiuc.edu">main |
| 53 | web site</a>. If you have questions or comments, the <a |
| 54 | href="http://mail.cs.uiuc.edu/mailman/listinfo/llvmdev">LLVM developer's mailing |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 55 | list</a> is a good place to send them.</p> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 56 | |
Chris Lattner | 9e84809 | 2003-12-12 04:25:33 +0000 | [diff] [blame] | 57 | <p>Note that if you are reading this file from CVS, this document applies |
| 58 | to the <i>next</i> release, not the current one. To see the release notes for |
| 59 | the current or previous releases, see the <a |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 60 | href="http://llvm.cs.uiuc.edu/releases/">releases page</a>.</p> |
| 61 | |
| 62 | </div> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 63 | |
| 64 | <!-- *********************************************************************** --> |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 65 | <div class="doc_section"> |
| 66 | <a name="whatsnew">What's New?</a> |
| 67 | </div> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 68 | <!-- *********************************************************************** --> |
| 69 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 70 | <div class="doc_text"> |
| 71 | |
John Criswell | d000e1d | 2003-12-18 16:43:17 +0000 | [diff] [blame^] | 72 | <p>This is the third public release of the LLVM compiler infrastructure. |
Chris Lattner | b40efb3 | 2003-12-14 05:03:43 +0000 | [diff] [blame] | 73 | </p> |
Chris Lattner | a509996 | 2003-12-06 20:22:41 +0000 | [diff] [blame] | 74 | |
Chris Lattner | 1124e2c | 2003-12-12 21:33:08 +0000 | [diff] [blame] | 75 | <p>At this time, LLVM is known to correctly compile and run all non-unwinding C |
| 76 | & C++ SPEC CPU2000 benchmarks, the Olden benchmarks, and the Ptrdist |
| 77 | benchmarks. It has also been used to compile <b>many</b> other programs. LLVM |
| 78 | now also works with a broad variety of C++ programs, though it has still |
| 79 | received much less testing than the C front-end. |
Chris Lattner | a509996 | 2003-12-06 20:22:41 +0000 | [diff] [blame] | 80 | </p> |
| 81 | |
| 82 | <p> |
John Criswell | d000e1d | 2003-12-18 16:43:17 +0000 | [diff] [blame^] | 83 | The LLVM native code generators are very stable but do not currently support |
Chris Lattner | 1124e2c | 2003-12-12 21:33:08 +0000 | [diff] [blame] | 84 | unwinding (exception throwing or <tt>longjmp</tt>ing), which prevent them from |
| 85 | working with programs like the <tt>253.perlbmk</tt> in SPEC CPU2000. The C |
John Criswell | d000e1d | 2003-12-18 16:43:17 +0000 | [diff] [blame^] | 86 | backend and the rest of LLVM supports these programs, so you can |
Chris Lattner | 1124e2c | 2003-12-12 21:33:08 +0000 | [diff] [blame] | 87 | still use LLVM with them. Support for unwinding will be added in a future |
| 88 | release. |
Chris Lattner | a509996 | 2003-12-06 20:22:41 +0000 | [diff] [blame] | 89 | </p> |
| 90 | |
| 91 | |
| 92 | <!--=========================================================================--> |
| 93 | <div class="doc_subsubsection"> |
| 94 | This release implements the following new features: |
| 95 | </div> |
Chris Lattner | 47ad72c | 2003-10-07 21:38:31 +0000 | [diff] [blame] | 96 | |
| 97 | <ol> |
Chris Lattner | b40efb3 | 2003-12-14 05:03:43 +0000 | [diff] [blame] | 98 | <li></li> |
| 99 | <li></li> |
Chris Lattner | 55ee031 | 2003-11-19 22:05:38 +0000 | [diff] [blame] | 100 | </ol> |
Chris Lattner | 0ef1906 | 2003-11-08 04:28:55 +0000 | [diff] [blame] | 101 | |
Chris Lattner | a509996 | 2003-12-06 20:22:41 +0000 | [diff] [blame] | 102 | |
| 103 | <!--=========================================================================--> |
| 104 | <div class="doc_subsubsection"> |
| 105 | In this release, the following missing features were implemented: |
| 106 | </div> |
Chris Lattner | 0ef1906 | 2003-11-08 04:28:55 +0000 | [diff] [blame] | 107 | |
| 108 | <ol> |
Chris Lattner | b40efb3 | 2003-12-14 05:03:43 +0000 | [diff] [blame] | 109 | <li></li> |
| 110 | <li></li> |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 111 | </ol> |
Chris Lattner | 47ad72c | 2003-10-07 21:38:31 +0000 | [diff] [blame] | 112 | |
Chris Lattner | a509996 | 2003-12-06 20:22:41 +0000 | [diff] [blame] | 113 | |
| 114 | <!--=========================================================================--> |
| 115 | <div class="doc_subsubsection"> |
| 116 | In this release, the following Quality of Implementation issues were |
| 117 | fixed: |
| 118 | </div> |
Chris Lattner | 89ca2b8 | 2003-10-27 17:06:39 +0000 | [diff] [blame] | 119 | |
| 120 | <ol> |
Chris Lattner | 0ef1906 | 2003-11-08 04:28:55 +0000 | [diff] [blame] | 121 | |
Chris Lattner | b40efb3 | 2003-12-14 05:03:43 +0000 | [diff] [blame] | 122 | <li></li> |
Chris Lattner | 0ef1906 | 2003-11-08 04:28:55 +0000 | [diff] [blame] | 123 | |
Chris Lattner | b40efb3 | 2003-12-14 05:03:43 +0000 | [diff] [blame] | 124 | <li></li> |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 125 | </ol> |
Chris Lattner | 89ca2b8 | 2003-10-27 17:06:39 +0000 | [diff] [blame] | 126 | |
Chris Lattner | a509996 | 2003-12-06 20:22:41 +0000 | [diff] [blame] | 127 | |
| 128 | <!--=========================================================================--> |
| 129 | <div class="doc_subsubsection"> |
| 130 | In this release, the following bugs in the previous release were fixed: |
| 131 | </div> |
| 132 | |
| 133 | <p>Bugs in the LLVM Core:</p> |
Chris Lattner | 47ad72c | 2003-10-07 21:38:31 +0000 | [diff] [blame] | 134 | |
| 135 | <ol> |
Misha Brukman | ad64385 | 2003-12-15 22:48:12 +0000 | [diff] [blame] | 136 | <li><a href="http://llvm.cs.uiuc.edu/PR179">[licm] LICM promotes volatile memory |
| 137 | locations to registers</a></li> |
Chris Lattner | 5b7142a | 2003-12-18 08:16:25 +0000 | [diff] [blame] | 138 | <li><a href="http://llvm.cs.uiuc.edu/PR191">[licm] Memory read after free causes |
| 139 | infrequent crash</a></li> |
Chris Lattner | b40efb3 | 2003-12-14 05:03:43 +0000 | [diff] [blame] | 140 | |
Chris Lattner | a509996 | 2003-12-06 20:22:41 +0000 | [diff] [blame] | 141 | </ol> |
| 142 | |
| 143 | |
| 144 | <p>Bugs in the C/C++ front-end:</p> |
| 145 | |
| 146 | <ol> |
Misha Brukman | ad64385 | 2003-12-15 22:48:12 +0000 | [diff] [blame] | 147 | <li><a href="http://llvm.cs.uiuc.edu/PR186">Need weak linkage on memory |
| 148 | management functions in libc runtime to allow them to be overriden</a></li> |
Chris Lattner | b40efb3 | 2003-12-14 05:03:43 +0000 | [diff] [blame] | 149 | <li></li> |
Chris Lattner | a509996 | 2003-12-06 20:22:41 +0000 | [diff] [blame] | 150 | </ol> |
Chris Lattner | 1909261 | 2003-10-02 16:38:05 +0000 | [diff] [blame] | 151 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 152 | </div> |
Chris Lattner | 1909261 | 2003-10-02 16:38:05 +0000 | [diff] [blame] | 153 | |
| 154 | <!-- *********************************************************************** --> |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 155 | <div class="doc_section"> |
| 156 | <a name="portability">Portability and Supported Platforms</a> |
| 157 | </div> |
Chris Lattner | 1909261 | 2003-10-02 16:38:05 +0000 | [diff] [blame] | 158 | <!-- *********************************************************************** --> |
| 159 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 160 | <div class="doc_text"> |
| 161 | |
| 162 | <p>LLVM has been extensively tested on Intel and AMD machines running Red |
Chris Lattner | b40efb3 | 2003-12-14 05:03:43 +0000 | [diff] [blame] | 163 | Hat Linux and FreeBSD. It has also been tested on Sun UltraSPARC workstations running Solaris 8. |
John Criswell | bb1bad5 | 2003-12-12 19:54:20 +0000 | [diff] [blame] | 164 | Additionally, |
John Criswell | d000e1d | 2003-12-18 16:43:17 +0000 | [diff] [blame^] | 165 | LLVM works on Mac OS X 10.3 and above, but only with the C backend or |
Chris Lattner | 9e84809 | 2003-12-12 04:25:33 +0000 | [diff] [blame] | 166 | interpreter (no native backend for the PowerPC is available yet). |
Chris Lattner | 1909261 | 2003-10-02 16:38:05 +0000 | [diff] [blame] | 167 | The core LLVM infrastructure uses "autoconf" for portability, so hopefully we |
Chris Lattner | 3e2959e | 2003-11-08 05:22:09 +0000 | [diff] [blame] | 168 | work on more platforms than that. However, it is likely that we |
John Criswell | d000e1d | 2003-12-18 16:43:17 +0000 | [diff] [blame^] | 169 | missed something and that minor porting is required to get LLVM to work on |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 170 | new platforms. We welcome portability patches and error messages.</p> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 171 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 172 | </div> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 173 | |
| 174 | <!-- *********************************************************************** --> |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 175 | <div class="doc_section"> |
| 176 | <a name="knownproblems">Known Problems</a> |
| 177 | </div> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 178 | <!-- *********************************************************************** --> |
| 179 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 180 | <div class="doc_text"> |
| 181 | |
| 182 | <p>This section contains all known problems with the LLVM system, listed by |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 183 | component. As new problems are discovered, they will be added to these |
Chris Lattner | 5eccca4 | 2003-12-12 21:22:16 +0000 | [diff] [blame] | 184 | sections. If you run into a problem, please check the <a |
John Criswell | d000e1d | 2003-12-18 16:43:17 +0000 | [diff] [blame^] | 185 | href="http://llvm.cs.uiuc.edu/bugs/">LLVM bug database</a> and submit a bug if |
Chris Lattner | 5eccca4 | 2003-12-12 21:22:16 +0000 | [diff] [blame] | 186 | there isn't already one.</p> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 187 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 188 | </div> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 189 | |
| 190 | <!-- _______________________________________________________________________ --> |
Chris Lattner | 1909261 | 2003-10-02 16:38:05 +0000 | [diff] [blame] | 191 | <!-- |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 192 | </ul><h4><a name="portability"><hr size=0>Portability Problems</h4><ul> |
Chris Lattner | 1909261 | 2003-10-02 16:38:05 +0000 | [diff] [blame] | 193 | --> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 194 | |
| 195 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 196 | <!-- ======================================================================= --> |
| 197 | <div class="doc_subsection"> |
| 198 | <a name="core">Known problems with the LLVM Core</a> |
| 199 | </div> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 200 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 201 | <div class="doc_text"> |
| 202 | |
| 203 | <ul> |
| 204 | |
| 205 | <li>In the JIT, <tt>dlsym</tt> on a symbol compiled by the JIT will not |
| 206 | work.</li> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 207 | |
| 208 | <li>The JIT does not use mutexes to protect its internal data structures. As |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 209 | such, execution of a threaded program could cause these data structures to be |
| 210 | corrupted.</li> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 211 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 212 | <li>It is not possible to <tt>dlopen</tt> an LLVM bytecode file in the JIT.</li> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 213 | |
Chris Lattner | e84843b | 2003-10-20 19:05:03 +0000 | [diff] [blame] | 214 | <li>Linking in static archive files (.a files) is very slow (there is no symbol |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 215 | table in the archive).</li> |
Chris Lattner | 2855ecd | 2003-11-04 20:06:53 +0000 | [diff] [blame] | 216 | |
Chris Lattner | 2855ecd | 2003-11-04 20:06:53 +0000 | [diff] [blame] | 217 | <li><a href="http://llvm.cs.uiuc.edu/PR82">LLVM cannot handle structures with |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 218 | more than 256 elements</a>.</li> |
| 219 | |
John Criswell | d000e1d | 2003-12-18 16:43:17 +0000 | [diff] [blame^] | 220 | <li> |
| 221 | The gccld program |
| 222 | <a href="http://llvm.cs.uiuc.edu/bugs/show_bug.cgi?id=139"> |
| 223 | does not link objects/archives in the order specified on the command line. |
| 224 | </a> |
| 225 | </li> |
| 226 | |
| 227 | <li> |
| 228 | <a href="http://llvm.cs.uiuc.edu/bugs/show_bug.cgi?id=174"> |
| 229 | Tail duplication does not update SSA form correctly. |
| 230 | </a> |
| 231 | </li> |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 232 | </ul> |
| 233 | |
| 234 | </div> |
| 235 | |
| 236 | <!-- ======================================================================= --> |
| 237 | <div class="doc_subsection"> |
| 238 | <a name="c-fe">Known problems with the C front-end</a> |
| 239 | </div> |
Chris Lattner | 47588f9 | 2003-10-02 05:07:23 +0000 | [diff] [blame] | 240 | |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 241 | <!-- _______________________________________________________________________ --> |
Chris Lattner | b40efb3 | 2003-12-14 05:03:43 +0000 | [diff] [blame] | 242 | <div class="doc_subsubsection">Bugs</div> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 243 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 244 | <div class="doc_text"> |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 245 | <ul> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 246 | <li>C99 Variable sized arrays do not release stack memory when they go out of |
| 247 | scope. Thus, the following program may run out of stack space: |
| 248 | <pre> |
| 249 | for (i = 0; i != 1000000; ++i) { |
| 250 | int X[n]; |
| 251 | foo(X); |
| 252 | } |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 253 | </pre></li> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 254 | |
John Criswell | d000e1d | 2003-12-18 16:43:17 +0000 | [diff] [blame^] | 255 | <li> |
| 256 | Initialization of global union variables can only be done |
| 257 | <a href="http://llvm.cs.uiuc.edu/bugs/show_bug.cgi?id=162">with the largest |
| 258 | union member</a>. |
| 259 | </li> |
Chris Lattner | e01fcfb | 2003-10-27 18:30:37 +0000 | [diff] [blame] | 260 | |
John Criswell | d000e1d | 2003-12-18 16:43:17 +0000 | [diff] [blame^] | 261 | <li> |
| 262 | <a href="http://llvm.cs.uiuc.edu/bugs/show_bug.cgi?id=182"> |
| 263 | Functions marked "extern inline" are not compiled into LLVM with linkonce |
| 264 | linkage. |
| 265 | </a> |
| 266 | </li> |
| 267 | |
| 268 | |
| 269 | <li> |
| 270 | The memory management functions in the libc runtime |
| 271 | <a href="http://llvm.cs.uiuc.edu/PR186">need weak linkage so that they can be |
| 272 | overridden. |
| 273 | </a> |
| 274 | </li> |
| 275 | </ul> |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 276 | </div> |
| 277 | |
| 278 | <!-- _______________________________________________________________________ --> |
| 279 | <div class="doc_subsubsection"> |
| 280 | Notes |
| 281 | </div> |
| 282 | |
| 283 | <div class="doc_text"> |
| 284 | |
| 285 | <ul> |
| 286 | |
| 287 | <li>Inline assembly is not yet supported.</li> |
Chris Lattner | e01fcfb | 2003-10-27 18:30:37 +0000 | [diff] [blame] | 288 | |
| 289 | <li>"long double" is transformed by the front-end into "double". There is no |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 290 | support for floating point data types of any size other than 32 and 64 |
| 291 | bits.</li> |
| 292 | |
| 293 | <li>The following Unix system functionality has not been tested and may not |
| 294 | work: |
Misha Brukman | e0c891c | 2003-11-22 01:00:11 +0000 | [diff] [blame] | 295 | <ol> |
| 296 | <li><tt>sigsetjmp</tt>, <tt>siglongjmp</tt> - These are not turned into the |
| 297 | appropriate <tt>invoke</tt>/<tt>unwind</tt> instructions. Note that |
| 298 | <tt>setjmp</tt> and <tt>longjmp</tt> <em>are</em> compiled correctly. |
| 299 | <li><tt>getcontext</tt>, <tt>setcontext</tt>, <tt>makecontext</tt> |
| 300 | - These functions have not been tested. |
| 301 | </ol></li> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 302 | |
| 303 | <li>Although many GCC extensions are supported, some are not. In particular, |
| 304 | the following extensions are known to <b>not be</b> supported: |
| 305 | <ol> |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 306 | <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Local-Labels.html#Local%20Labels">Local Labels</a>: Labels local to a block.</li> |
John Criswell | d000e1d | 2003-12-18 16:43:17 +0000 | [diff] [blame^] | 307 | <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 Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 308 | <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> |
| 309 | <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Constructing-Calls.html#Constructing%20Calls">Constructing Calls</a>: Dispatching a call to another function.</li> |
| 310 | <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 Criswell | d000e1d | 2003-12-18 16:43:17 +0000 | [diff] [blame^] | 311 | <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Constraints.html#Constraints">Constraints</a>: Constraints for asm operands.</li> |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 312 | <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> |
| 313 | <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> |
| 314 | <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> |
| 315 | <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> |
| 316 | <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> |
| 317 | <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Thread-Local.html#Thread-Local">Thread-Local</a>: Per-thread variables.</li> |
| 318 | <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Pragmas.html#Pragmas">Pragmas</a>: Pragmas accepted by GCC.</li> |
Misha Brukman | e0c891c | 2003-11-22 01:00:11 +0000 | [diff] [blame] | 319 | </ol> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 320 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 321 | <p>The following GCC extensions are <b>partially</b> supported. An ignored |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 322 | attribute means that the LLVM compiler ignores the presence of the attribute, |
| 323 | but the code should still work. An unsupported attribute is one which is |
John Criswell | d000e1d | 2003-12-18 16:43:17 +0000 | [diff] [blame^] | 324 | ignored by the LLVM compiler and will cause a different interpretation of |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 325 | the program.</p> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 326 | |
| 327 | <ol> |
| 328 | <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Variable-Length.html#Variable%20Length">Variable Length</a>: |
| 329 | Arrays whose length is computed at run time.<br> |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 330 | Supported, but allocated stack space is not freed until the function returns (noted above).</li> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 331 | |
| 332 | <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Function-Attributes.html#Function%20Attributes">Function Attributes</a>: |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 333 | |
John Criswell | d000e1d | 2003-12-18 16:43:17 +0000 | [diff] [blame^] | 334 | Declaring that functions have no side effects or that they can never |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 335 | return.<br> |
| 336 | |
| 337 | <b>Supported:</b> <tt>format</tt>, <tt>format_arg</tt>, <tt>non_null</tt>, |
| 338 | <tt>constructor</tt>, <tt>destructor</tt>, <tt>unused</tt>, |
| 339 | <tt>deprecated</tt>, <tt>warn_unused_result</tt>, <tt>weak</tt><br> |
| 340 | |
| 341 | <b>Ignored:</b> <tt>noreturn</tt>, <tt>noinline</tt>, |
| 342 | <tt>always_inline</tt>, <tt>pure</tt>, <tt>const</tt>, <tt>nothrow</tt>, |
| 343 | <tt>malloc</tt>, <tt>no_instrument_function</tt>, <tt>cdecl</tt><br> |
| 344 | |
| 345 | <b>Unsupported:</b> <tt>used</tt>, <tt>section</tt>, <tt>alias</tt>, |
| 346 | <tt>visibility</tt>, <tt>regparm</tt>, <tt>stdcall</tt>, |
| 347 | <tt>fastcall</tt>, all other target specific attributes</li> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 348 | |
| 349 | <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Variable-Attributes.html#Variable%20Attributes">Variable Attributes</a>: |
| 350 | Specifying attributes of variables.<br> |
| 351 | <b>Supported:</b> <tt>cleanup</tt>, <tt>common</tt>, <tt>nocommon</tt>, |
| 352 | <tt>deprecated</tt>, <tt>transparent_union</tt>, |
| 353 | <tt>unused</tt>, <tt>weak</tt><br> |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 354 | |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 355 | <b>Unsupported:</b> <tt>aligned</tt>, <tt>mode</tt>, <tt>packed</tt>, |
| 356 | <tt>section</tt>, <tt>shared</tt>, <tt>tls_model</tt>, |
| 357 | <tt>vector_size</tt>, <tt>dllimport</tt>, |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 358 | <tt>dllexport</tt>, all target specific attributes.</li> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 359 | |
Misha Brukman | c4b7bee | 2003-12-12 04:37:31 +0000 | [diff] [blame] | 360 | <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Type-Attributes.html#Type%20Attributes">Type Attributes</a>: Specifying attributes of types.<br> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 361 | <b>Supported:</b> <tt>transparent_union</tt>, <tt>unused</tt>, |
Misha Brukman | c4b7bee | 2003-12-12 04:37:31 +0000 | [diff] [blame] | 362 | <tt>deprecated</tt>, <tt>may_alias</tt><br> |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 363 | |
| 364 | <b>Unsupported:</b> <tt>aligned</tt>, <tt>packed</tt>, |
| 365 | all target specific attributes.</li> |
| 366 | |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 367 | <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Other-Builtins.html#Other%20Builtins">Other Builtins</a>: |
| 368 | Other built-in functions.<br> |
| 369 | We support all builtins which have a C language equivalent (e.g., |
| 370 | <tt>__builtin_cos</tt>), <tt>__builtin_alloca</tt>, |
| 371 | <tt>__builtin_types_compatible_p</tt>, <tt>__builtin_choose_expr</tt>, |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 372 | <tt>__builtin_constant_p</tt>, and <tt>__builtin_expect</tt> (ignored).</li> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 373 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 374 | </ol> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 375 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 376 | <p>The following extensions <b>are</b> known to be supported:</p> |
| 377 | |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 378 | <ol> |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 379 | <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html#Statement%20Exprs">Statement Exprs</a>: Putting statements and declarations inside expressions.</li> |
| 380 | <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> |
| 381 | <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Lvalues.html#Lvalues">Lvalues</a>: Using <code>?:</code>, "<code>,</code>" and casts in lvalues.</li> |
| 382 | <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Conditionals.html#Conditionals">Conditionals</a>: Omitting the middle operand of a <code>?:</code> expression.</li> |
| 383 | <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Long-Long.html#Long%20Long">Long Long</a>: Double-word integers.</li> |
| 384 | <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Complex.html#Complex">Complex</a>: Data types for complex numbers.</li> |
| 385 | <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Hex-Floats.html#Hex%20Floats">Hex Floats</a>:Hexadecimal floating-point constants.</li> |
| 386 | <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html#Zero%20Length">Zero Length</a>: Zero-length arrays.</li> |
| 387 | <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Empty-Structures.html#Empty%20Structures">Empty Structures</a>: Structures with no members.</li> |
| 388 | <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> |
| 389 | <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Escaped-Newlines.html#Escaped%20Newlines">Escaped Newlines</a>: Slightly looser rules for escaped newlines.</li> |
| 390 | <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 Brukman | c4b7bee | 2003-12-12 04:37:31 +0000 | [diff] [blame] | 391 | <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 Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 392 | <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Initializers.html#Initializers">Initializers</a>: Non-constant initializers.</li> |
John Criswell | d000e1d | 2003-12-18 16:43:17 +0000 | [diff] [blame^] | 393 | <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Compound-Literals.html#Compound%20Literals">Compound Literals</a>: Compound literals give structures, unions, |
| 394 | or arrays as values.</li> |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 395 | <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Designated-Inits.html#Designated%20Inits">Designated Inits</a>: Labeling elements of initializers.</li> |
Misha Brukman | c4b7bee | 2003-12-12 04:37:31 +0000 | [diff] [blame] | 396 | <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 Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 397 | <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Case-Ranges.html#Case%20Ranges">Case Ranges</a>: `case 1 ... 9' and such.</li> |
| 398 | <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Mixed-Declarations.html#Mixed%20Declarations">Mixed Declarations</a>: Mixing declarations and code.</li> |
| 399 | <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Function-Prototypes.html#Function%20Prototypes">Function Prototypes</a>: Prototype declarations and old-style definitions.</li> |
| 400 | <li><a href="http://gcc.gnu.org/onlinedocs/gcc/C---Comments.html#C++%20Comments">C++ Comments</a>: C++ comments are recognized.</li> |
| 401 | <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Dollar-Signs.html#Dollar%20Signs">Dollar Signs</a>: Dollar sign is allowed in identifiers.</li> |
| 402 | <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Character-Escapes.html#Character%20Escapes">Character Escapes</a>: <code>\e</code> stands for the character <ESC>.</li> |
| 403 | <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Alignment.html#Alignment">Alignment</a>: Inquiring about the alignment of a type or variable.</li> |
| 404 | <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Inline.html#Inline">Inline</a>: Defining inline functions (as fast as macros).</li> |
| 405 | <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> |
| 406 | <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> |
| 407 | <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> |
| 408 | <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> |
| 409 | <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Attribute-Syntax.html#Attribute%20Syntax">Attribute Syntax</a>: Formal syntax for attributes.</li> |
Misha Brukman | e0c891c | 2003-11-22 01:00:11 +0000 | [diff] [blame] | 410 | </ol></li> |
| 411 | |
| 412 | </ul> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 413 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 414 | <p>If you run into GCC extensions which have not been included in any of these |
| 415 | lists, please let us know (also including whether or not they work).</p> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 416 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 417 | </div> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 418 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 419 | <!-- ======================================================================= --> |
| 420 | <div class="doc_subsection"> |
| 421 | <a name="c++-fe">Known problems with the C++ front-end</a> |
| 422 | </div> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 423 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 424 | <div class="doc_text"> |
| 425 | |
John Criswell | d000e1d | 2003-12-18 16:43:17 +0000 | [diff] [blame^] | 426 | <p>For this release, the C++ front-end is considered to be fully functional but |
Chris Lattner | 9e84809 | 2003-12-12 04:25:33 +0000 | [diff] [blame] | 427 | has not been tested as thoroughly as the C front-end. It has been tested and |
| 428 | works for a number of non-trivial programs, but there may be lurking bugs. |
| 429 | Please report any bugs or problems.</p> |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 430 | |
| 431 | </div> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 432 | |
| 433 | <!-- _______________________________________________________________________ --> |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 434 | <div class="doc_subsubsection"> |
| 435 | Bugs |
| 436 | </div> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 437 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 438 | <div class="doc_text"> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 439 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 440 | <ul> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 441 | <li>The C++ front-end inherits all problems afflicting the <a href="#c-fe">C |
John Criswell | d000e1d | 2003-12-18 16:43:17 +0000 | [diff] [blame^] | 442 | front-end</a>.</li> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 443 | |
John Criswell | d000e1d | 2003-12-18 16:43:17 +0000 | [diff] [blame^] | 444 | <li> |
| 445 | <a href="http://llvm.cs.uiuc.edu/bugs/show_bug.cgi?id=137"> |
| 446 | Code is generated for empty classes. |
| 447 | </a> |
| 448 | </li> |
| 449 | </ul> |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 450 | </div> |
| 451 | |
| 452 | <!-- _______________________________________________________________________ --> |
| 453 | <div class="doc_subsubsection"> |
| 454 | Notes |
| 455 | </div> |
| 456 | |
| 457 | <div class="doc_text"> |
| 458 | |
| 459 | <ul> |
Chris Lattner | e01fcfb | 2003-10-27 18:30:37 +0000 | [diff] [blame] | 460 | |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 461 | <li>The C++ front-end is based on a pre-release of the GCC 3.4 C++ parser. This |
| 462 | parser is significantly more standards compliant (and picky) than prior GCC |
| 463 | versions. For more information, see the C++ section of the <a |
Chris Lattner | 9e84809 | 2003-12-12 04:25:33 +0000 | [diff] [blame] | 464 | href="http://gcc.gnu.org/gcc-3.4/changes.html">GCC 3.4 release notes</a>.</li> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 465 | |
| 466 | <li>Destructors for local objects are not always run when a <tt>longjmp</tt> is |
Chris Lattner | 1909261 | 2003-10-02 16:38:05 +0000 | [diff] [blame] | 467 | performed. In particular, destructors for objects in the <tt>longjmp</tt>ing |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 468 | function and in the <tt>setjmp</tt> receiver function may not be run. |
John Criswell | d000e1d | 2003-12-18 16:43:17 +0000 | [diff] [blame^] | 469 | Objects in intervening stack frames will be destroyed, however (which is |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 470 | better than most compilers).</li> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 471 | |
Chris Lattner | 1909261 | 2003-10-02 16:38:05 +0000 | [diff] [blame] | 472 | <li>The LLVM C++ front-end follows the <a |
| 473 | href="http://www.codesourcery.com/cxx-abi">Itanium C++ ABI</a>. |
| 474 | This document, which is not Itanium specific, specifies a standard for name |
| 475 | mangling, class layout, v-table layout, RTTI formats, and other C++ |
| 476 | representation issues. Because we use this API, code generated by the LLVM |
| 477 | compilers should be binary compatible with machine code generated by other |
| 478 | Itanium ABI C++ compilers (such as G++, the Intel and HP compilers, etc). |
| 479 | <i>However</i>, the exception handling mechanism used by LLVM is very |
| 480 | different from the model used in the Itanium ABI, so <b>exceptions will not |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 481 | interact correctly</b>. </li> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 482 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 483 | </ul> |
Chris Lattner | fcc54b3 | 2003-10-07 22:14:37 +0000 | [diff] [blame] | 484 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 485 | </div> |
| 486 | |
| 487 | <!-- ======================================================================= --> |
| 488 | <div class="doc_subsection"> |
| 489 | <a name="x86-be">Known problems with the X86 back-end</a> |
| 490 | </div> |
| 491 | |
| 492 | <div class="doc_text"> |
| 493 | |
| 494 | <ul> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 495 | |
Chris Lattner | fcc54b3 | 2003-10-07 22:14:37 +0000 | [diff] [blame] | 496 | <li>The X86 code generator <a |
Chris Lattner | 0d4379a | 2003-10-08 06:01:38 +0000 | [diff] [blame] | 497 | href="http://llvm.cs.uiuc.edu/PR16">does not currently |
Chris Lattner | fcc54b3 | 2003-10-07 22:14:37 +0000 | [diff] [blame] | 498 | support the <tt>unwind</tt> instruction</a>, so code that throws a C++ exception |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 499 | or calls the C <tt>longjmp</tt> function will abort.</li> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 500 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 501 | </ul> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 502 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 503 | </div> |
| 504 | |
| 505 | <!-- ======================================================================= --> |
| 506 | <div class="doc_subsection"> |
| 507 | <a name="sparc-be">Known problems with the Sparc back-end</a> |
| 508 | </div> |
| 509 | |
| 510 | <div class="doc_text"> |
| 511 | |
| 512 | <ul> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 513 | |
Chris Lattner | fcc54b3 | 2003-10-07 22:14:37 +0000 | [diff] [blame] | 514 | <li>The Sparc code generator <a |
Chris Lattner | 0d4379a | 2003-10-08 06:01:38 +0000 | [diff] [blame] | 515 | href="http://llvm.cs.uiuc.edu/PR15">does not currently |
Chris Lattner | fcc54b3 | 2003-10-07 22:14:37 +0000 | [diff] [blame] | 516 | support the <tt>unwind</tt> instruction</a>, so code that throws a C++ exception |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 517 | or calls the C <tt>longjmp</tt> function will abort.</li> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 518 | |
John Criswell | d000e1d | 2003-12-18 16:43:17 +0000 | [diff] [blame^] | 519 | <li> |
| 520 | <a href="http://llvm.cs.uiuc.edu/bugs/show_bug.cgi?id=167"> |
| 521 | The llc program can crash on legal code. |
| 522 | </a> |
| 523 | </li> |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 524 | </ul> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 525 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 526 | </div> |
| 527 | |
| 528 | <!-- ======================================================================= --> |
| 529 | <div class="doc_subsection"> |
| 530 | <a name="c-be">Known problems with the C back-end</a> |
| 531 | </div> |
| 532 | |
| 533 | <div class="doc_text"> |
| 534 | |
| 535 | <ul> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 536 | |
| 537 | <li>The C back-end produces code that violates the ANSI C Type-Based Alias |
| 538 | Analysis rules. As such, special options may be necessary to compile the code |
| 539 | (for example, GCC requires the <tt>-fno-strict-aliasing</tt> option). This |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 540 | problem probably cannot be fixed.</li> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 541 | |
Chris Lattner | e84843b | 2003-10-20 19:05:03 +0000 | [diff] [blame] | 542 | <li><a href="http://llvm.cs.uiuc.edu/PR33">Initializers for global variables</a> |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 543 | cannot include special floating point numbers like Not-A-Number or |
| 544 | Infinity.</li> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 545 | |
Chris Lattner | 2855ecd | 2003-11-04 20:06:53 +0000 | [diff] [blame] | 546 | <li><a href="http://llvm.cs.uiuc.edu/PR56">Zero arg vararg functions are not |
Chris Lattner | 2af4605 | 2003-10-24 04:03:19 +0000 | [diff] [blame] | 547 | supported</a>. This should not affect LLVM produced by the C or C++ |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 548 | frontends.</li> |
Chris Lattner | 2af4605 | 2003-10-24 04:03:19 +0000 | [diff] [blame] | 549 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 550 | </ul> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 551 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 552 | </div> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 553 | |
| 554 | <!-- *********************************************************************** --> |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 555 | <div class="doc_section"> |
| 556 | <a name="additionalinfo">Additional Information</a> |
| 557 | </div> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 558 | <!-- *********************************************************************** --> |
| 559 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 560 | <div class="doc_text"> |
| 561 | |
| 562 | <p>A wide variety of additional information is available on the LLVM web page, |
John Criswell | d000e1d | 2003-12-18 16:43:17 +0000 | [diff] [blame^] | 563 | including mailing lists and publications describing algorithms and components |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 564 | implemented in LLVM. The web page also contains versions of the API |
| 565 | documentation which is up-to-date with the CVS version of the source code. You |
| 566 | can access versions of these documents specific to this release by going into |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 567 | the "<tt>llvm/doc/</tt>" directory in the LLVM tree.</p> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 568 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 569 | <p>If you have any questions or comments about LLVM, please feel free to contact |
Chris Lattner | 5eccca4 | 2003-12-12 21:22:16 +0000 | [diff] [blame] | 570 | us via the <a href="http://mail.cs.uiuc.edu/mailman/listinfo/llvmdev">mailing |
| 571 | lists</a>.</p> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 572 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 573 | </div> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 574 | |
| 575 | <!-- *********************************************************************** --> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 576 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 577 | <hr> |
Misha Brukman | 2061e89 | 2003-11-22 01:23:39 +0000 | [diff] [blame] | 578 | <address> |
| 579 | <a href="http://jigsaw.w3.org/css-validator/"><img |
| 580 | src="http://jigsaw.w3.org/css-validator/images/vcss" alt="Valid CSS!"></a> |
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| 583 | |
Misha Brukman | e0c891c | 2003-11-22 01:00:11 +0000 | [diff] [blame] | 584 | <a href="http://llvm.cs.uiuc.edu">The LLVM Compiler Infrastructure</a><br> |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 585 | Last modified: $Date$ |
Misha Brukman | 2061e89 | 2003-11-22 01:23:39 +0000 | [diff] [blame] | 586 | </address> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 587 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 588 | </body> |
| 589 | </html> |