similar to: [LLVMdev] Re moving the instrumented instructions at runtime

> Assume I instrument some instructions by using some transformation passes. > At runtime, I just need those instrumented instructions at the beginning, > and I would like to remove instrumented instructions at runtime to reduce > overhead. At the beginning of what? You mean at the time of program starup? Then after detecting/collecting whatever you want, you would like to remove

Hello Wei-Ren, Thank you for your reply and suggestion. I mean that I use these instrumented instructions at the beginning of the program executions to collect some information. And after that, to reduce the overhead, we hope to remove these instrumented instructions at runtime. I want to know whether LLVM can modify the binary codes at runtime. Bo Chen Wei-Ren (陳韋任) wrote: > >>

On 24 April 2011 00:57, 陳韋任 <chenwj at iis.sinica.edu.tw> wrote: > Hi, Zhao > > You can apply the attachment to LLVM 2.9 Release. It has been tested > on FreeBSD/x86. > Hi Chen, may I commit this (updated to include GCDAProfiling.cpp) to LLVM SVN? Nick > > Regards, > chenwj > > -- > Wei-Ren Chen (陳韋任) > Computer Systems Lab, Institute of Information

Hi, Zhao > I have checked out llvm 2.9. There is only one CMakeLists file in Release or svn? I believe Nick has committed those CMake files into svn. You can apply my patch to LVM 2.9 Release. > "\llvm-2.9". and no CMakeLists file in folder either > "\llvm-2.9\runtime\libprofile" or "\llvm-2.9\runtime". Where did you get it? As Nick said, libprofile

Hello all, I have developed a instrumented pass which insert some variables between the original variables, as well as insert some code into the original source code. just like: ============= original source code ============= int a[10]; void fun1 () { // some source code here } ========================================= ============= instrumented source code ============= int

Hi, I am new to LLVM. I want to use LLVM to instrument codes, such as function calls and basic blocks. But I don't know where to start. I wonder if there are any example codes to show how to instrument codes in the IR level? Thanks. -- zhouxu -------------- next part -------------- An HTML attachment was scrubbed... URL:

Hi Nick Thanks for you reply. CMAKE is very new to me. I complied using GNU WIN32 and got those errors. Is it possible to compile it using GNU WIN 32 and anything need to be modified? I managed to compile the run time library on a mac machine. Yafan On Fri, Apr 22, 2011 at 5:04 PM, Nick Lewycky <nicholas at mxc.ca> wrote: > yafan zhao wrote: > >> Hi All >> Thanks for

Hi, Zhao You can apply the attachment to LLVM 2.9 Release. It has been tested on FreeBSD/x86. Regards, chenwj -- Wei-Ren Chen (陳韋任) Computer Systems Lab, Institute of Information Science, Academia Sinica, Taiwan (R.O.C.) Tel:886-2-2788-3799 #1667 -------------- next part -------------- diff -ruN llvm-2.9/CMakeLists.txt llvm-2.9.new/CMakeLists.txt --- llvm-2.9/CMakeLists.txt 2011-03-02

On 2/24/13 10:07 AM, Lu Mitnick wrote: > Hello all, > > I have developed a instrumented pass which insert some variables > between the original variables, > as well as insert some code into the original source code. just like: > > ============= original source code ============= > > int a[10]; > > void fun1 () { > // some source code here > } > >

I may try to use the Makefile then. When using gcc the Makefile is CC := colorgcc obj-m := hello.o KERNELDIR := /lib/modules/2.6.36.1/build PWD := $(shell pwd) modules: $(MAKE) -C $(KERNELDIR) M=$(PWD) modules #modules install: # $(MAKE) -C $(KERNELDIR) M=$(PWD) modules_install How to change it so the generating result is .bc file not the .o file? PLEASE BE KIND AND HELP ME~~ --

Hi Chen Thanks for the attached patch file. I have checked out llvm 2.9. There is only one CMakeLists file in "\llvm-2.9". and no CMakeLists file in folder either "\llvm-2.9\runtime\libprofile" or "\llvm-2.9\runtime". Where did you get it? Yafan 2011/4/26 Nick Lewycky <nlewycky at google.com> > On 24 April 2011 00:57, 陳韋任 <chenwj at

Hello, I have a question regarding PGO instrumented BBs (I use IR-level instrumentation). It seems that instrumented BBs do not match between the two compilations for profile-gen and profile-use for some cases. Here is an example from SPECcpu 2006 lbm (a simple case consisting of just two modules). In the first compilation, we have 5 instrumentation points for the main function as follows: $

> No idea what exactly you want to achieve, but let me try. > > First, you might need a function doing the instrument. Say, > > void HowManyTimeThisFunctionGetCalled(); > > Then you can insert a call to the function above while creating > a LLVM function [1]. In that way, every time that LLVM function > get called the function doing the instrument will be called.

Also you might need to check use PostRASchedulerList or PostMachineScheduler, PostRASchedulerList is considered deprecated as mentioned in [1]. [1] http://lists.llvm.org/pipermail/llvm-dev/2017-April/112348.html HTH, chenwj 2017-06-10 4:03 GMT+08:00 陳韋任 <chenwj.cs97g at g2.nctu.edu.tw>: > Not saying I am totally understand how thing works, but I think you're > misleading >

I am wriitng an LLVM pass to insert instrumentation at certain points of the program. I want to pass the `StringRef` obtained from `getName()` as a parameter to a function `func(char* s)`. I can allocate some space on stack using `AllocaInst` to generate an `alloca` instruction. But, how can I copy the `StringRef` to the stack space? -- Thanks & Regards, Dipanjan -------------- next part

Hi all, I think it's Gentoo's bug, but I want to know if anyone has the same issue here. I am compiling LLVM trunk on Gentoo (gcc 4.5.2), and I get error message below, --- make[4]: Entering directory `/nfs_home/chenwj/llvm-3.1/svn/build/tools/clang/lib/Frontend' llvm[4]: Compiling InitHeaderSearch.cpp for Release+Asserts build

Hi Justin, I believe the PTX section in the link below need some love, updating "lib/Target/PTX" to "lib/Target/NVPTX" for example. Would you like to take a look? http://llvm.org/docs/CodeGenerator.html#the-ptx-backend Regards, chenwj -- Wei-Ren Chen (陳韋任) Computer Systems Lab, Institute of Information Science, Academia Sinica, Taiwan (R.O.C.) Tel:886-2-2788-3799 #1667

Is it possible to use DTrace to display the number of arguments and their types for userland or kernel functions that are not explicitly instrumented or documented by their authors? We''re talking about functions provided by Veritas VxVM/VxFS and the like, and for example, we might want to try tracing I/Os from App => VxFS => VxVM => ssd driver to see where I/Os get aggregated or

Hi, folks I am trying to build LLVM-GCC 4.2 on a Linux/PowerPC machine. Actually, the PowerPC is a PS3. The source was downloaded from http://llvm.org/releases/2.8/llvm-gcc-4.2-2.8.source.tgz Here is my system information and configuration options: ---------------------------------------------------------------------- $ uname -a Linux ps3 2.6.32-rc2-00995-g96ebbe6-dirty #2 SMP Fri Oct 2

Hi 陳韋任, Sorry for the late response. On Apr 21, 2012, at 8:03 PM, 陳韋任 wrote: > I have a native compile and the result seems better... You can compare > the result of cross compile [1] and the native compile [2]. > > Any though? > I'm not particularly happy about the failures here. We need to get to the bottom of them. In the previous email, you tried setting CFLAGS and