similar to: big module for a project

Dear John, Thanks for your reply. I want to do whole program analysis, all what I need are just the separate .bc files. What instructions should I follow? I run the configure on apache in this way: CC=clang CFLAGS=-emit-llvm ./configure while I get the error message like: checking for gcc... clang checking for C compiler default output file name... configure: error: C compiler cannot

Hi, How to compile a large project (such as Apache) by using llvm-gcc? I tried to replace CC with llvm-gcc and CFLAGS with -emit-llvm while running configure, but it didn't work. Thank you for your help. -Wink

Wink zhang wrote: > Hi, > > How to compile a large project (such as Apache) by using llvm-gcc? > I tried to replace CC with llvm-gcc and CFLAGS with -emit-llvm while > running configure, but it didn't work. > If you just want to compile the program with llvm-gcc, then Diego's instructions are fine. If, however, you want to do inter-procedural optimization or whole

Wink zhang wrote: > Dear John, > > Thanks for your reply. I want to do whole program analysis, all what I > need are just the separate .bc files. What instructions should I follow? > I'm a little confused. Whole-program analysis requires that you link all of the individual bitcode files from different compilation unit (i.e., individual .c files) together into a single

Hello, As far as I know, the LLVM pass manager only perform at the llvm bytecode level. This means for each program, I have to convert it to a LLVM bytecode by: llvm-gcc -c -emit-llvm test.c then, I can issue the llvm pass manager to invoke my own pass and produce an output as LLVM bytecode, such as: opt -my-pass < test.o > test.new.o After this point, I need to convert it to assembly

Hi John, Are there any documents about how to add a pass into LTO? Cheers, Zheng On 19 April 2010 15:11, John Criswell <criswell at uiuc.edu> wrote: > Dear Zheng Wang, > > You have a few options: > > 1) You can add your pass to the set of passes that llvm-gcc runs when it > optimizes code.  This requires re-compiling llvm-gcc; it also means that > your pass must be

Dear Zheng Wang, You have a few options: 1) You can add your pass to the set of passes that llvm-gcc runs when it optimizes code. This requires re-compiling llvm-gcc; it also means that your pass must be able to run on incomplete programs and be run multiple times over the same code (i.e., it cannot do whole-program analysis). 2) You can change the build system of the program you're

Hi all, I'm trying to generate whole program bitcode files for linux kernel and do interprocedural analysis on kernel. I use llvmlinux to compile kernel with clang and generate a bunch of bitcode files successfully. I need to link all these bitcode files together into a single bitcode file, so that I can run whole program analysis. Should I use libLTO to link all these bitcode files

On 6/20/16 3:46 PM, Yuxi Chen wrote: > Hi, > > Thanks for your reply. > But I still don't know how a transform pass updates a new analysis > pass after it modifies the IR. Can you explain it clearly? I am not > familiar with pass management and invocation. Passes can have methods that allow their internal state to be updated by other passes (the same way that their state

Hi all, I am newbie for llvm. I just create a global variable, there are some statements in my pass like: LoadInst* int64_64 = new LoadInst(pthreadPID, "", false, OptAplusOne); int64_64->setAlignment(8); int64_64->dump(); LoadInst* int32_65 = new LoadInst(gvar_int32_myFlag, "", false, OptAplusOne); int32_65->setAlignment(4);

I am learning to do some basic dataflow analysis on C code projects, such as Apache httpd. Now I am a newbie of LLVM IR, and there are some problems in doing that. In the official User Manual of how to write a LLVM PASS, they only show the way to generate IR of a single ".c" source file. But in fact there are so many examples that the usage and definition of a function are not in the

On 6/19/16 4:28 AM, Mehdi Amini via llvm-dev wrote: > >> On Jun 18, 2016, at 10:44 PM, Yuxi Chen via llvm-dev >> <llvm-dev at lists.llvm.org <mailto:llvm-dev at lists.llvm.org>> wrote: >> >> Hi All, >> >> When I use llvm, I encounter a problem like "unable to schedule pass >> A required by C" >> I investigated deeper.

Hi, I want to copy some dependent statements, like a = b, b = c, from one basicblock to another basicblocks. Because of SSA, a = b, will be like %1 = load %b, store %1, %a. If I just use clone() method in Instruction class, it will be like <badref> = load %b, store <badref>, %a. If I need remap the virtual registers, this map just will affect the whole module? And how to use it? I am

Thanks John. Your approach worked fine for my small toy program. Now, I would like to run my module pass on a huge project (still a single executable) consisting of a few thousand bit code files scattered in many different directories. And some of them are static libraries. Do you still think it's a good idea to manually gather and link them with llvm-ld? I've seen other module pass

On 8/19/11 4:36 PM, Jinwook Shin (HOTWING) wrote: > > Thanks John. Your approach worked fine for my small toy program. Now, > I would like to run my module pass on a huge project (still a single > executable) consisting of a few thousand bit code files scattered in > many different directories. And some of them are static libraries. Do > you still think it's a good idea

Hello Everyone, Just subscribed to the mailing list. I was wondering how I am going to fetch each functions of a specific source code file (c/c++) using the LLVM framework. For instance, I would like to apply certain passes using llvm-opt on certain functions not the whole file. I would appreciate any hints or idea leading me about the starting point. Regards, -Amir -------------- next part

Hi Herbie, thanks for you answer and explanation. > > Also, if any of the functions are external, you are completely stuck (unless you put everything together with lld). I am indeed having a problem regarding external function. I my program is just one file everything work and I can access all the functions. However, if it has multiple files I have a lot of unresolved pointers to

Hi All, After the initial learning curve, we're excited to have put together a completely gcc/binutils-free toolchain based on LLVM. Now that we have things working, we desperately need to optimize the resulting binaries. Our bin files are up to 10x their fully optimized gcc equivalent (1.5k vs 16k). This is for a bare metal ARM based system so this is significant. We're using lld for

Thank you very much John. With an environment variable I need to take some special care, but it looks like the only way to go. On Sun, Mar 30, 2014 at 11:07 AM, John Criswell <criswell at illinois.edu>wrote: > Dear Rahman, > > I think your best option is to modify the code in libLTO so that it runs > your pass when you want it to run. I believe the file you want to modify

Thanks for the answer John. I checked the llvm-extract and it works, but my concern is if the output of the extract could be saved as .ll instead of .bc. Sort of human-readable format so that I can parse it. Otherwise, it is better to parse the foo.ll file right away instead of using the extract tool. Please correct me if I am wrong. Thanks, -Amir On Tue, Oct 21, 2014 at 7:02 PM, John