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...ed C++ code using global analysis? If I could use llvm to figure out what code I can delete in a 20 year old app with millions of lines of code, this alone would defend spending time on making the app build with llvm, even if we don't actually run the code generated... -- Øyvind Harboe - Can Zylin Consulting help on your project? US toll free 1-866-980-3434 / International +47 51 87 40 27 http://www.zylin.com/

I've tried llvm 2.8 and 2.9, but they both have problems with #include <iosfwd>. Any pointers to what this might be? /usr/include/c++/4.5/iosfwd:39:10: fatal error: 'bits/c++config.h' file not found #include <bits/c++config.h> -- Øyvind Harboe - Can Zylin Consulting help on your project? US toll free 1-866-980-3434 / International +47 51 87 40 27 http://www.zylin.com/

...see what's actually *used* when the app is run normally. Then you can ask the question, what percentage of all lines of code are dead? A static analysis will not be able to see through things like virtual method calls. Reid On Sun, Jul 3, 2011 at 3:07 PM, Øyvind Harboe <oyvind.harboe at zylin.com> wrote: > Can llvm generate warnings for unused C++ code using global > analysis? > > If I could use llvm to figure out what code I can delete in a 20 > year old app with millions of lines of code, this alone would defend > spending time on making the app build with llvm, e...

...10 and >>> I was wondering if clang/llvm 2.8 would do it. >> >> Perhaps I better try the latest, got an error when I tried 2.8: > > C++ support in clang 2.8 was poor. I'll try to build & install clang from svn/git and see how that goes... -- Øyvind Harboe - Can Zylin Consulting help on your project? US toll free 1-866-980-3434 / International +47 51 87 40 27 http://www.zylin.com/

Hi all, Zylin has implemented the world smallest 32 bit CPU with a GCC backend. (I shall stand corrected if anyone claims & proves otherwise :-) Implementing a GCC backend for a zero operand/stack based architecture proved pretty tricky, but I'm quite pleased with the resulting code. I did make alterati...

On Thu, Jun 30, 2011 at 02:44:26PM +0200, Øyvind Harboe wrote: > On Thu, Jun 30, 2011 at 2:03 PM, Duncan Sands <baldrick at free.fr> wrote: > > Hi Øyvind, > > > >> I'm trying to find some written evidence to present to the powers > >> that be that clang/llvm is ABI compatible with GCC 4.1 linux > >> 64 bit. > > > > both clang and

...; Starting with which version? > > I think GCC last changed the C++ ABI with version 3.4. Sorry, I meant from which version of clang? I'm using Ubuntu 10 and I was wondering if clang/llvm 2.8 would do it. clang --version clang version 2.8 (branches/release_28) -- Øyvind Harboe - Can Zylin Consulting help on your project? US toll free 1-866-980-3434 / International +47 51 87 40 27 http://www.zylin.com/

...wondering if clang/llvm 2.8 would do it. Perhaps I better try the latest, got an error when I tried 2.8: In file included from testsuite/test.cpp:8: In file included from ./testsuite/precompile.h:4: ./util/precompile.h:17:12: fatal error: 'iosfwd' file not found -- Øyvind Harboe - Can Zylin Consulting help on your project? US toll free 1-866-980-3434 / International +47 51 87 40 27 http://www.zylin.com/

...would allow me to work with clang/llvm at my day-job and I would like nothing better! This is a pretty big app(millions of lines of code), so it would be interesting to see how llvm/clang behaves. Better warnings/errors and cutting down on build times would be huge wins. -- Øyvind Harboe - Can Zylin Consulting help on your project? US toll free 1-866-980-3434 / International +47 51 87 40 27 http://www.zylin.com/

...ut they both have problems with > #include <iosfwd>. > > Any pointers to what this might be? > > /usr/include/c++/4.5/iosfwd:39:10: fatal error: 'bits/c++config.h' > file not found > #include <bits/c++config.h> > > > -- > Øyvind Harboe - Can Zylin Consulting help on your project? > US toll free 1-866-980-3434 / International +47 51 87 40 27 > http://www.zylin.com/ > > _______________________________________________ > LLVM Developers mailing list > LLVMdev at cs.uiuc.edu http://llvm.cs.uiuc.edu > http://lists.cs....

...powers >> that be that clang/llvm is ABI compatible with GCC 4.1 linux >> 64 bit. > > both clang and gcc-4.1 are supposed to conform to the platform ABI (if they > don't then that is a bug), and thus be ABI compatible. Starting with which version? -- Øyvind Harboe - Can Zylin Consulting help on your project? US toll free 1-866-980-3434 / International +47 51 87 40 27 http://www.zylin.com/

On Thu, Jun 30, 2011 at 4:00 PM, Øyvind Harboe <oyvind.harboe at zylin.com> wrote: > On Thu, Jun 30, 2011 at 3:43 PM, Duncan Sands <baldrick at free.fr> wrote: >> On 30/06/11 15:13, Øyvind Harboe wrote: >>>> Sorry, I meant from which version of clang? I'm using Ubuntu 10 and >>>> I was wondering if clang/llvm 2.8 would do...

...non-starter. That said, it would be interesting to add gcov to the testsuite to get a measure of how many percent of the application we're exercising.... > A static analysis will not be able to see through things like virtual > method calls. Not even in theory? -- Øyvind Harboe - Can Zylin Consulting help on your project? US toll free 1-866-980-3434 / International +47 51 87 40 27 http://www.zylin.com/

Hi Øyvind, > I'm trying to find some written evidence to present to the powers > that be that clang/llvm is ABI compatible with GCC 4.1 linux > 64 bit. both clang and gcc-4.1 are supposed to conform to the platform ABI (if they don't then that is a bug), and thus be ABI compatible. Ciao, Duncan.

...generate (imperfect) call graphs for you. It sounds like you just need a rough list of functions that might be unused to start with. -Scott On Sun, Jul 3, 2011 at 11:04 PM, Daniel Berlin <dberlin at dberlin.org> wrote: > On Mon, Jul 4, 2011 at 1:42 AM, Øyvind Harboe <oyvind.harboe at zylin.com> wrote: >> On Sun, Jul 3, 2011 at 10:34 PM, Reid Kleckner <reid.kleckner at gmail.com> wrote: >>> An easier way would be to use a coverage tool like gcov to see what's >>> actually *used* when the app is run normally.  Then you can ask the >>> quest...

...123; => loadsp 16 # push value at memory location sp+16 onto stack loadsp 24 # another value add im 123 add storesp 20 # store back to original location. Notice 16+4=20 LLVM represents the above as something like: (set a, (add (add a,b), 123) -- Øyvind Harboe Can Zylin Consulting help on your project? US toll free 1-866-980-3434 / International +47 51 63 25 00 http://www.zylin.com/zy1000.html ARM7 ARM9 ARM11 XScale Cortex JTAG debugger and flash programmer

...would allow me to work with clang/llvm at my day-job and I would like nothing better! This is a pretty big app(millions of lines of code), so it would be interesting to see how llvm/clang behaves. Better warnings/errors and cutting down on build times would be huge wins. -- Øyvind Harboe - Can Zylin Consulting help on your project? US toll free 1-866-980-3434 / International +47 51 87 40 27 http://www.zylin.com/

On 30/06/11 15:13, Øyvind Harboe wrote: >> Sorry, I meant from which version of clang? I'm using Ubuntu 10 and >> I was wondering if clang/llvm 2.8 would do it. > > Perhaps I better try the latest, got an error when I tried 2.8: C++ support in clang 2.8 was poor. Ciao, Duncan. > > In file included from testsuite/test.cpp:8: > In file included from

...thing. I don't have the link right here, but I saw someone was working on a project to list unused #include files. That too would be a big boon in untangling large 20 year old code. I'll settle for good guesses when iron clad guarantees are provably impossible :-) -- Øyvind Harboe - Can Zylin Consulting help on your project? US toll free 1-866-980-3434 / International +47 51 87 40 27 http://www.zylin.com/

...at a Windows app can then use. This would build the performance sensitive code on the target machine making it possible to exploit CPU specific x86 vector instructions. The code that calls fn's in the DLL should, ideally, be unaware that a llvm JIT is being used. -- Øyvind Harboe http://www.zylin.com/zy1000.html ARM7 ARM9 XScale Cortex JTAG debugger and flash programmer