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"> |
| 6 | <title>LLVM 1.1 Release Notes</title> |
| 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"> |
| 11 | LLVM 1.1 Release Notes |
| 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 | 1909261 | 2003-10-02 16:38:05 +0000 | [diff] [blame] | 21 | <!-- <li><a href="#portabilityprobs">Portability Problems</a> --> |
Chris Lattner | 79c3fe1 | 2003-10-02 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> |
| 26 | <li><a href="#sparc-be">Known problems with the Sparc Back-end</a> |
| 27 | <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] | 28 | </ul></li> |
| 29 | <li><a href="#additionalinfo">Additional Information</a></li> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 30 | </ol> |
| 31 | |
Misha Brukman | e0c891c | 2003-11-22 01:00:11 +0000 | [diff] [blame^] | 32 | <div class="doc_text"> |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 33 | <p><b>Written by <a href="mailto:sabre@nondot.org">Chris Lattner</a></b><p> |
| 34 | </div> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 35 | |
| 36 | <!-- *********************************************************************** --> |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 37 | <div class="doc_section"> |
| 38 | <a name="intro">Introduction</a> |
| 39 | </div> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 40 | <!-- *********************************************************************** --> |
| 41 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 42 | <div class="doc_text"> |
| 43 | |
| 44 | <p>This document contains the release notes for the LLVM compiler |
| 45 | infrastructure, release 1.1. Here we describe the status of LLVM, including any |
| 46 | known problems, and bug fixes from the previous release. The most up-to-date |
| 47 | version of this document can be found on the <a |
Chris Lattner | 12d9063 | 2003-10-27 01:31:14 +0000 | [diff] [blame] | 48 | href="http://llvm.cs.uiuc.edu/releases/1.1/">LLVM 1.1 web site</a>. If you are |
Chris Lattner | 47ad72c | 2003-10-07 21:38:31 +0000 | [diff] [blame] | 49 | 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] | 50 | this document may be updated after the release.</p> |
Chris Lattner | 1909261 | 2003-10-02 16:38:05 +0000 | [diff] [blame] | 51 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 52 | <p>For more information about LLVM, including information about potentially more |
Chris Lattner | 47ad72c | 2003-10-07 21:38:31 +0000 | [diff] [blame] | 53 | current releases, please check out the <a href="http://llvm.cs.uiuc.edu">main |
| 54 | web site</a>. If you have questions or comments, the <a |
| 55 | 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] | 56 | list</a> is a good place to send them.</p> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 57 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 58 | <p>Note that if you are reading this file from CVS, that this document applies |
| 59 | to the <i>next</i> release, not the previous one. To see the release notes for |
| 60 | the previous release, see the <a |
| 61 | href="http://llvm.cs.uiuc.edu/releases/">releases page</a>.</p> |
| 62 | |
| 63 | </div> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 64 | |
| 65 | <!-- *********************************************************************** --> |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 66 | <div class="doc_section"> |
| 67 | <a name="whatsnew">What's New?</a> |
| 68 | </div> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 69 | <!-- *********************************************************************** --> |
| 70 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 71 | <div class="doc_text"> |
| 72 | |
| 73 | <p>This is the second public release of the LLVM compiler infrastructure. This |
| 74 | release implements the following new features:</p> |
Chris Lattner | 47ad72c | 2003-10-07 21:38:31 +0000 | [diff] [blame] | 75 | |
| 76 | <ol> |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 77 | <li><a |
Chris Lattner | 55ee031 | 2003-11-19 22:05:38 +0000 | [diff] [blame] | 78 | href="http://mail.cs.uiuc.edu/pipermail/llvmdev/2003-November/000528.html">A new |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 79 | LLVM profiler, similar to gprof</a> is available</li> |
Chris Lattner | 0ef1906 | 2003-11-08 04:28:55 +0000 | [diff] [blame] | 80 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 81 | <li>LLVM and the C/C++ front-end now compile on Mac OSX! Mac OSX users can |
Chris Lattner | 55ee031 | 2003-11-19 22:05:38 +0000 | [diff] [blame] | 82 | now explore the LLVM optimizer with the C backend (note that LLVM requires GCC |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 83 | 3.3 on Mac OSX).</li> |
Chris Lattner | 0ef1906 | 2003-11-08 04:28:55 +0000 | [diff] [blame] | 84 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 85 | <li>LLVM has been <a |
Chris Lattner | 2a77f2d | 2003-11-11 23:46:35 +0000 | [diff] [blame] | 86 | href="http://mail.cs.uiuc.edu/pipermail/llvmdev/2003-November/000554.html">moved |
| 87 | into an 'llvm' C++ namespace</a>, for easier integration with third-party |
Misha Brukman | e0c891c | 2003-11-22 01:00:11 +0000 | [diff] [blame^] | 88 | code. Note that due to a bug in GDB 5.x, to debug namespacified LLVM code, |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 89 | you will need to upgrade to GDB 6.</li> |
Chris Lattner | 55ee031 | 2003-11-19 22:05:38 +0000 | [diff] [blame] | 90 | </ol> |
Chris Lattner | 0ef1906 | 2003-11-08 04:28:55 +0000 | [diff] [blame] | 91 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 92 | <p>In this release, the following missing features were implemented:</p> |
Chris Lattner | 0ef1906 | 2003-11-08 04:28:55 +0000 | [diff] [blame] | 93 | |
| 94 | <ol> |
| 95 | <li><a href="http://llvm.cs.uiuc.edu/PR88">The interpreter does not support |
| 96 | invoke or unwind</a></li> |
Misha Brukman | c99037d | 2003-11-14 03:30:43 +0000 | [diff] [blame] | 97 | |
| 98 | <li><a href="http://llvm.cs.uiuc.edu/PR99">Interpreter does not support the |
Chris Lattner | 55ee031 | 2003-11-19 22:05:38 +0000 | [diff] [blame] | 99 | <tt>vaarg</tt> instruction</a></li> |
Misha Brukman | c99037d | 2003-11-14 03:30:43 +0000 | [diff] [blame] | 100 | |
Brian Gaeke | b7508ee | 2003-11-16 23:49:26 +0000 | [diff] [blame] | 101 | <li><a href="http://llvm.cs.uiuc.edu/PR117">llvm-nm cannot read archive |
Chris Lattner | 55ee031 | 2003-11-19 22:05:38 +0000 | [diff] [blame] | 102 | files</a></li> |
Brian Gaeke | b7508ee | 2003-11-16 23:49:26 +0000 | [diff] [blame] | 103 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 104 | </ol> |
Chris Lattner | 47ad72c | 2003-10-07 21:38:31 +0000 | [diff] [blame] | 105 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 106 | <p>In this release, the following Quality of Implementation issues were |
| 107 | fixed:</p> |
Chris Lattner | 89ca2b8 | 2003-10-27 17:06:39 +0000 | [diff] [blame] | 108 | |
| 109 | <ol> |
Chris Lattner | 0ef1906 | 2003-11-08 04:28:55 +0000 | [diff] [blame] | 110 | |
| 111 | <li><a href="http://llvm.cs.uiuc.edu/PR29">C++ front-end is not generating |
| 112 | linkonce linkage type when it can</a></li> |
| 113 | |
| 114 | <li><a href="http://llvm.cs.uiuc.edu/PR84">C front-end doesn't emit |
| 115 | getelementptr for address of array element</a></li> |
| 116 | |
Chris Lattner | ba46d55 | 2003-11-16 20:25:24 +0000 | [diff] [blame] | 117 | <li><a href="http://llvm.cs.uiuc.edu/PR96">Bad path to the C/C++ frontend causes |
| 118 | build problems</a></li> |
| 119 | |
| 120 | <li><a href="http://llvm.cs.uiuc.edu/PR114">LLVM header files should be -Wold-style-cast clean</a></li> |
| 121 | |
Chris Lattner | 55ee031 | 2003-11-19 22:05:38 +0000 | [diff] [blame] | 122 | <li>The LLVM bytecode reader has been <a |
| 123 | href="http://llvm.cs.uiuc.edu/PR127">sped up a lot</a> (up to 4x in some |
| 124 | cases).</li> |
| 125 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 126 | </ol> |
Chris Lattner | 89ca2b8 | 2003-10-27 17:06:39 +0000 | [diff] [blame] | 127 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 128 | <p>In this release, the following bugs in the previous release were fixed:</p> |
Chris Lattner | 47ad72c | 2003-10-07 21:38:31 +0000 | [diff] [blame] | 129 | |
| 130 | <ol> |
Chris Lattner | f710020 | 2003-10-27 05:41:39 +0000 | [diff] [blame] | 131 | <li><a href="http://llvm.cs.uiuc.edu/PR57">[inliner] Inlining invoke with PHI in unwind target is broken</a></li> |
Chris Lattner | 89ca2b8 | 2003-10-27 17:06:39 +0000 | [diff] [blame] | 132 | <li><a href="http://llvm.cs.uiuc.edu/PR58">[linker] linkonce globals should link successfully to external globals</a></li> |
Chris Lattner | 4ad4b3a | 2003-10-27 17:58:57 +0000 | [diff] [blame] | 133 | <li><a href="http://llvm.cs.uiuc.edu/PR59">C++ frontend can crash when compiling virtual base classes</a></li> |
Chris Lattner | 2c17a89 | 2003-10-28 23:13:03 +0000 | [diff] [blame] | 134 | <li><a href="http://llvm.cs.uiuc.edu/PR62">C backend fails on constant cast expr to ptr-to-anonymous struct</a></li> |
Chris Lattner | 287b621 | 2003-10-29 01:26:07 +0000 | [diff] [blame] | 135 | <li><a href="http://llvm.cs.uiuc.edu/PR63">#ident is not recognized by C frontend</a></li> |
Chris Lattner | 32547fe | 2003-10-29 07:17:13 +0000 | [diff] [blame] | 136 | <li><a href="http://llvm.cs.uiuc.edu/PR64">[constmerge] Constant merging pass merges constants with external linkage</a></li> |
| 137 | <li><a href="http://llvm.cs.uiuc.edu/PR65">C front-end miscompiles the builtin_expect intrinsic!</a></li> |
Chris Lattner | 34790e5 | 2003-10-29 18:49:14 +0000 | [diff] [blame] | 138 | <li><a href="http://llvm.cs.uiuc.edu/PR66">[scalarrepl] Scalar Replacement of aggregates is decimating structures it shouldn't be</a></li> |
| 139 | <li><a href="http://llvm.cs.uiuc.edu/PR67">1.0 precompiled libstdc++ does not include wchar_t support</a></li> |
Chris Lattner | 05b958d | 2003-10-29 20:59:45 +0000 | [diff] [blame] | 140 | <li><a href="http://llvm.cs.uiuc.edu/PR68">llvmgcc asserts when compiling functions renamed with asm's</a></li> |
| 141 | <li><a href="http://llvm.cs.uiuc.edu/PR69">C frontend crashes on some programs with lots of types.</a></li> |
Chris Lattner | 36bd5d1 | 2003-10-30 01:20:42 +0000 | [diff] [blame] | 142 | <li><a href="http://llvm.cs.uiuc.edu/PR70">[instcombine] Resolving invoke inserts cast after terminator</a></li> |
Chris Lattner | f9e8a0f | 2003-10-30 01:43:33 +0000 | [diff] [blame] | 143 | <li><a href="http://llvm.cs.uiuc.edu/PR71">llvm-as crashes when labels are used in phi nodes</a></li> |
Chris Lattner | 3dcc7b9 | 2003-10-30 16:20:15 +0000 | [diff] [blame] | 144 | <li><a href="http://llvm.cs.uiuc.edu/PR72">[build problem] Callgraph.cpp not pulled in from libipa.a</a></li> |
Chris Lattner | 3af4722 | 2003-11-16 22:11:42 +0000 | [diff] [blame] | 145 | <li><a href="http://llvm.cs.uiuc.edu/PR77">Variables in scope of output setjmp |
| 146 | calls should be volatile</a>. Note that this does not effect correctness on |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 147 | many platforms, such as X86.</li> |
Chris Lattner | 8222eca | 2003-11-02 02:15:11 +0000 | [diff] [blame] | 148 | <li><a href="http://llvm.cs.uiuc.edu/PR79">llvm-gcc crashes compiling global union initializer</a></li> |
| 149 | <li><a href="http://llvm.cs.uiuc.edu/PR80">C front-end crash on empty structure</a></li> |
| 150 | <li><a href="http://llvm.cs.uiuc.edu/PR81">CFrontend crashes when compiling C99 compound expressions</a></li> |
Chris Lattner | 2fb1ef8 | 2003-11-03 20:08:08 +0000 | [diff] [blame] | 151 | <li><a href="http://llvm.cs.uiuc.edu/PR83">[X86] Emission of global bool initializers broken</a></li> |
Chris Lattner | 2855ecd | 2003-11-04 20:06:53 +0000 | [diff] [blame] | 152 | <li><a href="http://llvm.cs.uiuc.edu/PR87">llvm-gcc infinite loops on "case MAXINT:"</a></li> |
Chris Lattner | de3bb57 | 2003-11-05 06:30:04 +0000 | [diff] [blame] | 153 | <li><a href="http://llvm.cs.uiuc.edu/PR89">[C++] Catch blocks make unparsable labels</a></li> |
| 154 | <li><a href="http://llvm.cs.uiuc.edu/PR90">[C++] Initializing array with constructable objects fail</a></li> |
| 155 | <li><a href="http://llvm.cs.uiuc.edu/PR91">[gccld] The -r (relinking) option does not work correctly</a></li> |
Chris Lattner | 5b3fb03 | 2003-11-07 04:46:56 +0000 | [diff] [blame] | 156 | <li><a href="http://llvm.cs.uiuc.edu/PR92">[bcreader] Cannot read shift constant expressions from bytecode file</a></li> |
| 157 | <li><a href="http://llvm.cs.uiuc.edu/PR93">[lowersetjmp] Lowersetjmp pass breaks dominance properties!</a></li> |
| 158 | <li><a href="http://llvm.cs.uiuc.edu/PR94">llvm-gcc tries to add bools</a></li> |
Chris Lattner | 11dde85 | 2003-11-09 19:44:07 +0000 | [diff] [blame] | 159 | <li><a href="http://llvm.cs.uiuc.edu/PR95">SymbolTable::getUniqueName is very inefficient</a></li> |
Chris Lattner | 5b3fb03 | 2003-11-07 04:46:56 +0000 | [diff] [blame] | 160 | <li><a href="http://llvm.cs.uiuc.edu/PR98">[buildscripts] Building into objdir with .o in it fails</a></li> |
Chris Lattner | 7af4d5e | 2003-11-08 05:18:50 +0000 | [diff] [blame] | 161 | <li><a href="http://llvm.cs.uiuc.edu/PR101">[setjmp/longjmp] Linking C programs which use setjmp/longjmp sometimes fail with references to the C++ runtime library!</a></li> |
Chris Lattner | 11dde85 | 2003-11-09 19:44:07 +0000 | [diff] [blame] | 162 | <li><a href="http://llvm.cs.uiuc.edu/PR104">[c++] C++ Frontend lays out superclasses like anonymous bitfields!</a></li> |
Chris Lattner | 9b29bde | 2003-11-12 04:42:37 +0000 | [diff] [blame] | 163 | <li><a href="http://llvm.cs.uiuc.edu/PR107">AsmParser Misses Symbol Redefinition Error</a></li> |
Brian Gaeke | 7879206 | 2003-11-11 21:52:34 +0000 | [diff] [blame] | 164 | <li><a href="http://llvm.cs.uiuc.edu/PR108">gccld -Lfoo -lfoo fails to find ./foo/libfoo.a</a></li> |
Chris Lattner | 6e4046f | 2003-11-14 06:42:01 +0000 | [diff] [blame] | 165 | <li><a href="http://llvm.cs.uiuc.edu/PR110">[bcreader] Incorrect cast causes misread forward constant references</a></li> |
Brian Gaeke | 502c481 | 2003-11-12 22:48:52 +0000 | [diff] [blame] | 166 | <li><a href="http://llvm.cs.uiuc.edu/PR112">Casting a string constant to void crashes llvm-gcc</a></li> |
Chris Lattner | 5edc1bb | 2003-11-16 21:42:48 +0000 | [diff] [blame] | 167 | <li><a href="http://llvm.cs.uiuc.edu/PR116">[adce] ADCE considers blocks without postdominators to be unreachable</a></li> |
Chris Lattner | 17a51ce | 2003-11-18 06:25:05 +0000 | [diff] [blame] | 168 | <li><a href="http://llvm.cs.uiuc.edu/PR54">C front-end miscompiles unsigned enums whose LLVM types are signed</a></li> |
Chris Lattner | 43a54cc | 2003-11-18 23:04:02 +0000 | [diff] [blame] | 169 | <li><a href="http://llvm.cs.uiuc.edu/PR123">[X86] div and rem constant exprs invalidate iterators!</a></li> |
| 170 | <li><a href="http://llvm.cs.uiuc.edu/PR125">[llvmg++] Enum types are incorrectly shrunk to smaller than 'int' size</a></li> |
| 171 | <li><a href="http://llvm.cs.uiuc.edu/PR128">[llvmg++] Cannot use pointer to member to initialize global</a></li> |
Chris Lattner | 6ff1a92 | 2003-11-19 01:08:24 +0000 | [diff] [blame] | 172 | <li><a href="http://llvm.cs.uiuc.edu/PR130">[vmcore] Symbol table doesn't rename colliding variables during type resolution</a></li> |
| 173 | <li><a href="http://llvm.cs.uiuc.edu/PR131">[llvm-gcc] ?: operator as lvalue not implemented</a></li> |
Chris Lattner | 55ee031 | 2003-11-19 22:05:38 +0000 | [diff] [blame] | 174 | <li><a href="http://llvm.cs.uiuc.edu/PR133">[C/C++] Bogus warning about taking the address of 'register' variable</a></li> |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 175 | <li><a href="http://llvm.cs.uiuc.edu/PR97">bugpoint must not pass -R<directory> to Mach-O linker</a></li> |
Chris Lattner | 18c4d85 | 2003-11-20 01:07:41 +0000 | [diff] [blame] | 176 | <li><a href="http://llvm.cs.uiuc.edu/PR113">crash assigning into an array in a struct which contains a bitfield</a>.</li> |
| 177 | <li><a href="http://llvm.cs.uiuc.edu/PR6">Oversized integer bitfields cause crash</a></li> |
Misha Brukman | 76683d3 | 2003-11-21 22:11:12 +0000 | [diff] [blame] | 178 | <li><a href="http://llvm.cs.uiuc.edu/PR140">gccld produces a runner script that includes command-line options to load the necessary shared objects</a></li> |
Chris Lattner | fc59223 | 2003-11-20 19:11:47 +0000 | [diff] [blame] | 179 | <li><a href="http://llvm.cs.uiuc.edu/PR141">[llvm-gcc] Bitfields & large array don't mix well</a></li> |
Chris Lattner | 6c024c4b | 2003-11-20 19:30:17 +0000 | [diff] [blame] | 180 | <li><a href="http://llvm.cs.uiuc.edu/PR132">[llvm-gcc] Complex division is not supported</a></li> |
Chris Lattner | 5f36ebe | 2003-11-20 20:59:57 +0000 | [diff] [blame] | 181 | <li><a href="http://llvm.cs.uiuc.edu/PR143">[llvm-gcc] Illegal union field reference</a></li> |
Chris Lattner | 47ad72c | 2003-10-07 21:38:31 +0000 | [diff] [blame] | 182 | </ol><p> |
| 183 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 184 | <p>At this time, LLVM is known to work properly with SPEC CPU 2000 (X86 only), |
| 185 | the Olden benchmarks, and the Ptrdist benchmarks among many other programs. |
| 186 | Note however that the Sparc and X86 backends do not currently support exception |
| 187 | throwing or long jumping (including 253.perlbmk in SPEC). For these programs, |
| 188 | you must use the C backend.</p> |
Chris Lattner | 1909261 | 2003-10-02 16:38:05 +0000 | [diff] [blame] | 189 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 190 | </div> |
Chris Lattner | 1909261 | 2003-10-02 16:38:05 +0000 | [diff] [blame] | 191 | |
| 192 | <!-- *********************************************************************** --> |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 193 | <div class="doc_section"> |
| 194 | <a name="portability">Portability and Supported Platforms</a> |
| 195 | </div> |
Chris Lattner | 1909261 | 2003-10-02 16:38:05 +0000 | [diff] [blame] | 196 | <!-- *********************************************************************** --> |
| 197 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 198 | <div class="doc_text"> |
| 199 | |
| 200 | <p>LLVM has been extensively tested on Intel and AMD machines running Red |
Chris Lattner | 3e2959e | 2003-11-08 05:22:09 +0000 | [diff] [blame] | 201 | Hat Linux, and Sun UltraSPARC workstations running Solaris 8. Additionally, |
| 202 | LLVM works on Mac OS/X 10.3 and above, but only with the C back-end (no native |
| 203 | backend for the PowerPC is available yet). |
Chris Lattner | 1909261 | 2003-10-02 16:38:05 +0000 | [diff] [blame] | 204 | The core LLVM infrastructure uses "autoconf" for portability, so hopefully we |
Chris Lattner | 3e2959e | 2003-11-08 05:22:09 +0000 | [diff] [blame] | 205 | work on more platforms than that. However, it is likely that we |
| 206 | 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] | 207 | new platforms. We welcome portability patches and error messages.</p> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 208 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 209 | </div> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 210 | |
| 211 | <!-- *********************************************************************** --> |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 212 | <div class="doc_section"> |
| 213 | <a name="knownproblems">Known Problems</a> |
| 214 | </div> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 215 | <!-- *********************************************************************** --> |
| 216 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 217 | <div class="doc_text"> |
| 218 | |
| 219 | <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] | 220 | component. As new problems are discovered, they will be added to these |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 221 | sections.</p> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 222 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 223 | </div> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 224 | |
| 225 | <!-- _______________________________________________________________________ --> |
Chris Lattner | 1909261 | 2003-10-02 16:38:05 +0000 | [diff] [blame] | 226 | <!-- |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 227 | </ul><h4><a name="portability"><hr size=0>Portability Problems</h4><ul> |
Chris Lattner | 1909261 | 2003-10-02 16:38:05 +0000 | [diff] [blame] | 228 | --> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 229 | |
| 230 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 231 | <!-- ======================================================================= --> |
| 232 | <div class="doc_subsection"> |
| 233 | <a name="core">Known problems with the LLVM Core</a> |
| 234 | </div> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 235 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 236 | <div class="doc_text"> |
| 237 | |
| 238 | <ul> |
| 239 | |
| 240 | <li>In the JIT, <tt>dlsym</tt> on a symbol compiled by the JIT will not |
| 241 | work.</li> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 242 | |
| 243 | <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] | 244 | such, execution of a threaded program could cause these data structures to be |
| 245 | corrupted.</li> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 246 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 247 | <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] | 248 | |
Chris Lattner | e84843b | 2003-10-20 19:05:03 +0000 | [diff] [blame] | 249 | <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] | 250 | table in the archive).</li> |
Chris Lattner | 2855ecd | 2003-11-04 20:06:53 +0000 | [diff] [blame] | 251 | |
Chris Lattner | 2855ecd | 2003-11-04 20:06:53 +0000 | [diff] [blame] | 252 | <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] | 253 | more than 256 elements</a>.</li> |
| 254 | |
| 255 | </ul> |
| 256 | |
| 257 | </div> |
| 258 | |
| 259 | <!-- ======================================================================= --> |
| 260 | <div class="doc_subsection"> |
| 261 | <a name="c-fe">Known problems with the C front-end</a> |
| 262 | </div> |
Chris Lattner | 47588f9 | 2003-10-02 05:07:23 +0000 | [diff] [blame] | 263 | |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 264 | <!-- _______________________________________________________________________ --> |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 265 | <div class="doc_subsubsection"> |
| 266 | Bugs |
| 267 | </div> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 268 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 269 | <div class="doc_text"> |
| 270 | |
| 271 | <ul> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 272 | |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 273 | <li>C99 Variable sized arrays do not release stack memory when they go out of |
| 274 | scope. Thus, the following program may run out of stack space: |
| 275 | <pre> |
| 276 | for (i = 0; i != 1000000; ++i) { |
| 277 | int X[n]; |
| 278 | foo(X); |
| 279 | } |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 280 | </pre></li> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 281 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 282 | </ul> |
Chris Lattner | e01fcfb | 2003-10-27 18:30:37 +0000 | [diff] [blame] | 283 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 284 | </div> |
| 285 | |
| 286 | <!-- _______________________________________________________________________ --> |
| 287 | <div class="doc_subsubsection"> |
| 288 | Notes |
| 289 | </div> |
| 290 | |
| 291 | <div class="doc_text"> |
| 292 | |
| 293 | <ul> |
| 294 | |
| 295 | <li>Inline assembly is not yet supported.</li> |
Chris Lattner | e01fcfb | 2003-10-27 18:30:37 +0000 | [diff] [blame] | 296 | |
| 297 | <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] | 298 | support for floating point data types of any size other than 32 and 64 |
| 299 | bits.</li> |
| 300 | |
| 301 | <li>The following Unix system functionality has not been tested and may not |
| 302 | work: |
Misha Brukman | e0c891c | 2003-11-22 01:00:11 +0000 | [diff] [blame^] | 303 | <ol> |
| 304 | <li><tt>sigsetjmp</tt>, <tt>siglongjmp</tt> - These are not turned into the |
| 305 | appropriate <tt>invoke</tt>/<tt>unwind</tt> instructions. Note that |
| 306 | <tt>setjmp</tt> and <tt>longjmp</tt> <em>are</em> compiled correctly. |
| 307 | <li><tt>getcontext</tt>, <tt>setcontext</tt>, <tt>makecontext</tt> |
| 308 | - These functions have not been tested. |
| 309 | </ol></li> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 310 | |
| 311 | <li>Although many GCC extensions are supported, some are not. In particular, |
| 312 | the following extensions are known to <b>not be</b> supported: |
| 313 | <ol> |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 314 | <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Local-Labels.html#Local%20Labels">Local Labels</a>: Labels local to a block.</li> |
| 315 | <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> |
| 316 | <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> |
| 317 | <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Constructing-Calls.html#Constructing%20Calls">Constructing Calls</a>: Dispatching a call to another function.</li> |
| 318 | <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> |
| 319 | <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Constraints.html#Constraints">Constraints</a>: Constraints for asm operands</li> |
| 320 | <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> |
| 321 | <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> |
| 322 | <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> |
| 323 | <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> |
| 324 | <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> |
| 325 | <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Thread-Local.html#Thread-Local">Thread-Local</a>: Per-thread variables.</li> |
| 326 | <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^] | 327 | </ol> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 328 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 329 | <p>The following GCC extensions are <b>partially</b> supported. An ignored |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 330 | attribute means that the LLVM compiler ignores the presence of the attribute, |
| 331 | but the code should still work. An unsupported attribute is one which is |
| 332 | ignored by the LLVM compiler, which will cause a different interpretation of |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 333 | the program.</p> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 334 | |
| 335 | <ol> |
| 336 | <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Variable-Length.html#Variable%20Length">Variable Length</a>: |
| 337 | Arrays whose length is computed at run time.<br> |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 338 | 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] | 339 | |
| 340 | <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] | 341 | |
| 342 | Declaring that functions have no side effects, or that they can never |
| 343 | return.<br> |
| 344 | |
| 345 | <b>Supported:</b> <tt>format</tt>, <tt>format_arg</tt>, <tt>non_null</tt>, |
| 346 | <tt>constructor</tt>, <tt>destructor</tt>, <tt>unused</tt>, |
| 347 | <tt>deprecated</tt>, <tt>warn_unused_result</tt>, <tt>weak</tt><br> |
| 348 | |
| 349 | <b>Ignored:</b> <tt>noreturn</tt>, <tt>noinline</tt>, |
| 350 | <tt>always_inline</tt>, <tt>pure</tt>, <tt>const</tt>, <tt>nothrow</tt>, |
| 351 | <tt>malloc</tt>, <tt>no_instrument_function</tt>, <tt>cdecl</tt><br> |
| 352 | |
| 353 | <b>Unsupported:</b> <tt>used</tt>, <tt>section</tt>, <tt>alias</tt>, |
| 354 | <tt>visibility</tt>, <tt>regparm</tt>, <tt>stdcall</tt>, |
| 355 | <tt>fastcall</tt>, all other target specific attributes</li> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 356 | |
| 357 | <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Variable-Attributes.html#Variable%20Attributes">Variable Attributes</a>: |
| 358 | Specifying attributes of variables.<br> |
| 359 | <b>Supported:</b> <tt>cleanup</tt>, <tt>common</tt>, <tt>nocommon</tt>, |
| 360 | <tt>deprecated</tt>, <tt>transparent_union</tt>, |
| 361 | <tt>unused</tt>, <tt>weak</tt><br> |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 362 | |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 363 | <b>Unsupported:</b> <tt>aligned</tt>, <tt>mode</tt>, <tt>packed</tt>, |
| 364 | <tt>section</tt>, <tt>shared</tt>, <tt>tls_model</tt>, |
| 365 | <tt>vector_size</tt>, <tt>dllimport</tt>, |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 366 | <tt>dllexport</tt>, all target specific attributes.</li> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 367 | |
| 368 | <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Type-Attributes.html#Type%20Attributes">Type Attributes</a>: Specifying attributes of types. |
| 369 | <b>Supported:</b> <tt>transparent_union</tt>, <tt>unused</tt>, |
| 370 | <tt>deprecated</tt>, <tt>may_alias</tt> |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 371 | |
| 372 | <b>Unsupported:</b> <tt>aligned</tt>, <tt>packed</tt>, |
| 373 | all target specific attributes.</li> |
| 374 | |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 375 | <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Other-Builtins.html#Other%20Builtins">Other Builtins</a>: |
| 376 | Other built-in functions.<br> |
| 377 | We support all builtins which have a C language equivalent (e.g., |
| 378 | <tt>__builtin_cos</tt>), <tt>__builtin_alloca</tt>, |
| 379 | <tt>__builtin_types_compatible_p</tt>, <tt>__builtin_choose_expr</tt>, |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 380 | <tt>__builtin_constant_p</tt>, and <tt>__builtin_expect</tt> (ignored).</li> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 381 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 382 | </ol> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 383 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 384 | <p>The following extensions <b>are</b> known to be supported:</p> |
| 385 | |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 386 | <ol> |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 387 | <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html#Statement%20Exprs">Statement Exprs</a>: Putting statements and declarations inside expressions.</li> |
| 388 | <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> |
| 389 | <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Lvalues.html#Lvalues">Lvalues</a>: Using <code>?:</code>, "<code>,</code>" and casts in lvalues.</li> |
| 390 | <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Conditionals.html#Conditionals">Conditionals</a>: Omitting the middle operand of a <code>?:</code> expression.</li> |
| 391 | <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Long-Long.html#Long%20Long">Long Long</a>: Double-word integers.</li> |
| 392 | <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Complex.html#Complex">Complex</a>: Data types for complex numbers.</li> |
| 393 | <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Hex-Floats.html#Hex%20Floats">Hex Floats</a>:Hexadecimal floating-point constants.</li> |
| 394 | <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html#Zero%20Length">Zero Length</a>: Zero-length arrays.</li> |
| 395 | <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Empty-Structures.html#Empty%20Structures">Empty Structures</a>: Structures with no members.</li> |
| 396 | <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> |
| 397 | <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Escaped-Newlines.html#Escaped%20Newlines">Escaped Newlines</a>: Slightly looser rules for escaped newlines.</li> |
| 398 | <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> |
| 399 | <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> |
| 400 | <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Initializers.html#Initializers">Initializers</a>: Non-constant initializers.</li> |
| 401 | <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Compound-Literals.html#Compound%20Literals">Compound Literals</a>: Compound literals give structures, unions or arrays as values.</li> |
| 402 | <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Designated-Inits.html#Designated%20Inits">Designated Inits</a>: Labeling elements of initializers.</li> |
| 403 | <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> |
| 404 | <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Case-Ranges.html#Case%20Ranges">Case Ranges</a>: `case 1 ... 9' and such.</li> |
| 405 | <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Mixed-Declarations.html#Mixed%20Declarations">Mixed Declarations</a>: Mixing declarations and code.</li> |
| 406 | <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Function-Prototypes.html#Function%20Prototypes">Function Prototypes</a>: Prototype declarations and old-style definitions.</li> |
| 407 | <li><a href="http://gcc.gnu.org/onlinedocs/gcc/C---Comments.html#C++%20Comments">C++ Comments</a>: C++ comments are recognized.</li> |
| 408 | <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Dollar-Signs.html#Dollar%20Signs">Dollar Signs</a>: Dollar sign is allowed in identifiers.</li> |
| 409 | <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> |
| 410 | <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Alignment.html#Alignment">Alignment</a>: Inquiring about the alignment of a type or variable.</li> |
| 411 | <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Inline.html#Inline">Inline</a>: Defining inline functions (as fast as macros).</li> |
| 412 | <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> |
| 413 | <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> |
| 414 | <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> |
| 415 | <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> |
| 416 | <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^] | 417 | </ol></li> |
| 418 | |
| 419 | </ul> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 420 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 421 | <p>If you run into GCC extensions which have not been included in any of these |
| 422 | 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] | 423 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 424 | </div> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 425 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 426 | <!-- ======================================================================= --> |
| 427 | <div class="doc_subsection"> |
| 428 | <a name="c++-fe">Known problems with the C++ front-end</a> |
| 429 | </div> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 430 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 431 | <div class="doc_text"> |
| 432 | |
| 433 | <p>For this release, the C++ front-end is considered to be fully functional but |
| 434 | of <b>beta</b> quality. It has been tested and works for a number of simple |
| 435 | programs that collectively exercise most of the language. Nevertheless, it has |
| 436 | not been in use as long as the C front-end. Please report any bugs or |
| 437 | problems.</p> |
| 438 | |
| 439 | </div> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 440 | |
| 441 | <!-- _______________________________________________________________________ --> |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 442 | <div class="doc_subsubsection"> |
| 443 | Bugs |
| 444 | </div> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 445 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 446 | <div class="doc_text"> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 447 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 448 | <ul> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 449 | <li>The C++ front-end inherits all problems afflicting the <a href="#c-fe">C |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 450 | front-end</a></li> |
| 451 | </ul> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 452 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 453 | </div> |
| 454 | |
| 455 | <!-- _______________________________________________________________________ --> |
| 456 | <div class="doc_subsubsection"> |
| 457 | Notes |
| 458 | </div> |
| 459 | |
| 460 | <div class="doc_text"> |
| 461 | |
| 462 | <ul> |
Chris Lattner | e01fcfb | 2003-10-27 18:30:37 +0000 | [diff] [blame] | 463 | |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 464 | <li>The C++ front-end is based on a pre-release of the GCC 3.4 C++ parser. This |
| 465 | parser is significantly more standards compliant (and picky) than prior GCC |
| 466 | versions. For more information, see the C++ section of the <a |
| 467 | href="http://gcc.gnu.org/gcc-3.4/changes.html">GCC 3.4 release notes</a>.<p> |
| 468 | |
| 469 | <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] | 470 | performed. In particular, destructors for objects in the <tt>longjmp</tt>ing |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 471 | function and in the <tt>setjmp</tt> receiver function may not be run. |
| 472 | Objects in intervening stack frames will be destroyed however (which is |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 473 | better than most compilers).</li> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 474 | |
Chris Lattner | 1909261 | 2003-10-02 16:38:05 +0000 | [diff] [blame] | 475 | <li>The LLVM C++ front-end follows the <a |
| 476 | href="http://www.codesourcery.com/cxx-abi">Itanium C++ ABI</a>. |
| 477 | This document, which is not Itanium specific, specifies a standard for name |
| 478 | mangling, class layout, v-table layout, RTTI formats, and other C++ |
| 479 | representation issues. Because we use this API, code generated by the LLVM |
| 480 | compilers should be binary compatible with machine code generated by other |
| 481 | Itanium ABI C++ compilers (such as G++, the Intel and HP compilers, etc). |
| 482 | <i>However</i>, the exception handling mechanism used by LLVM is very |
| 483 | 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] | 484 | interact correctly</b>. </li> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 485 | |
Chris Lattner | e01fcfb | 2003-10-27 18:30:37 +0000 | [diff] [blame] | 486 | <li><a href="http://llvm.cs.uiuc.edu/PR11">Code for executing destructors when |
| 487 | unwinding is not shared</a> (this is a quality of implementation problem, |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 488 | which does not effect functionality).</li> |
Chris Lattner | fcc54b3 | 2003-10-07 22:14:37 +0000 | [diff] [blame] | 489 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 490 | </ul> |
Chris Lattner | fcc54b3 | 2003-10-07 22:14:37 +0000 | [diff] [blame] | 491 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 492 | </div> |
| 493 | |
| 494 | <!-- ======================================================================= --> |
| 495 | <div class="doc_subsection"> |
| 496 | <a name="x86-be">Known problems with the X86 back-end</a> |
| 497 | </div> |
| 498 | |
| 499 | <div class="doc_text"> |
| 500 | |
| 501 | <ul> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 502 | |
Chris Lattner | fcc54b3 | 2003-10-07 22:14:37 +0000 | [diff] [blame] | 503 | <li>The X86 code generator <a |
Chris Lattner | 0d4379a | 2003-10-08 06:01:38 +0000 | [diff] [blame] | 504 | href="http://llvm.cs.uiuc.edu/PR16">does not currently |
Chris Lattner | fcc54b3 | 2003-10-07 22:14:37 +0000 | [diff] [blame] | 505 | 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] | 506 | or calls the C <tt>longjmp</tt> function will abort.</li> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 507 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 508 | </ul> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 509 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 510 | </div> |
| 511 | |
| 512 | <!-- ======================================================================= --> |
| 513 | <div class="doc_subsection"> |
| 514 | <a name="sparc-be">Known problems with the Sparc back-end</a> |
| 515 | </div> |
| 516 | |
| 517 | <div class="doc_text"> |
| 518 | |
| 519 | <ul> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 520 | |
Chris Lattner | fcc54b3 | 2003-10-07 22:14:37 +0000 | [diff] [blame] | 521 | <li>The Sparc code generator <a |
Chris Lattner | 0d4379a | 2003-10-08 06:01:38 +0000 | [diff] [blame] | 522 | href="http://llvm.cs.uiuc.edu/PR15">does not currently |
Chris Lattner | fcc54b3 | 2003-10-07 22:14:37 +0000 | [diff] [blame] | 523 | 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] | 524 | or calls the C <tt>longjmp</tt> function will abort.</li> |
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 | </ul> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 527 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 528 | </div> |
| 529 | |
| 530 | <!-- ======================================================================= --> |
| 531 | <div class="doc_subsection"> |
| 532 | <a name="c-be">Known problems with the C back-end</a> |
| 533 | </div> |
| 534 | |
| 535 | <div class="doc_text"> |
| 536 | |
| 537 | <ul> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 538 | |
| 539 | <li>The C back-end produces code that violates the ANSI C Type-Based Alias |
| 540 | Analysis rules. As such, special options may be necessary to compile the code |
| 541 | (for example, GCC requires the <tt>-fno-strict-aliasing</tt> option). This |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 542 | problem probably cannot be fixed.</li> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 543 | |
Chris Lattner | e84843b | 2003-10-20 19:05:03 +0000 | [diff] [blame] | 544 | <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] | 545 | cannot include special floating point numbers like Not-A-Number or |
| 546 | Infinity.</li> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 547 | |
Chris Lattner | 2855ecd | 2003-11-04 20:06:53 +0000 | [diff] [blame] | 548 | <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] | 549 | 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] | 550 | frontends.</li> |
Chris Lattner | 2af4605 | 2003-10-24 04:03:19 +0000 | [diff] [blame] | 551 | |
Chris Lattner | 2855ecd | 2003-11-04 20:06:53 +0000 | [diff] [blame] | 552 | <li>The code produces by the C back-end has only been tested with the Sun CC, |
| 553 | GCC, and Intel compilers. It is possible that it will have to be adjusted to |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 554 | support other C compilers.</li> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 555 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 556 | </ul> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 557 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 558 | </div> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 559 | |
| 560 | <!-- *********************************************************************** --> |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 561 | <div class="doc_section"> |
| 562 | <a name="additionalinfo">Additional Information</a> |
| 563 | </div> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 564 | <!-- *********************************************************************** --> |
| 565 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 566 | <div class="doc_text"> |
| 567 | |
| 568 | <p>A wide variety of additional information is available on the LLVM web page, |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 569 | including mailing lists publications describing algorithms and components |
| 570 | implemented in LLVM. The web page also contains versions of the API |
| 571 | documentation which is up-to-date with the CVS version of the source code. You |
| 572 | 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] | 573 | the "<tt>llvm/doc/</tt>" directory in the LLVM tree.</p> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 574 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 575 | <p>If you have any questions or comments about LLVM, please feel free to contact |
| 576 | us via the mailing lists.</p> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 577 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 578 | </div> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 579 | |
| 580 | <!-- *********************************************************************** --> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 581 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 582 | <hr> |
| 583 | <div class="doc_footer"> |
Misha Brukman | e0c891c | 2003-11-22 01:00:11 +0000 | [diff] [blame^] | 584 | <a href="http://validator.w3.org/check/referer"><img width="88" height="31" |
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| 587 | src="http://jigsaw.w3.org/css-validator/images/vcss" alt="Valid CSS!"></a><br> |
| 588 | <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] | 589 | Last modified: $Date$ |
| 590 | </div> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 591 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 592 | </body> |
| 593 | </html> |