similar to: question about xray tls data initialization

with some dirty hack , I've made xray runtime 'built' on windows , but unfortunately I haven't enough knowledge about linker and the runtime, and finally built executable didn't run. I'd like to share my changes here , hopes somebody help me to make it run on windows. in AsmPrinter, copy/paster xray for coff target InstMap =

Hi llvm-dev, I'm currently looking for alternatives to the synthetic references that XRay uses to keep some side-tables live, to avoid linker garbage collection from deleting those sections. Before going any further, let me give a backgrounder on what XRay does today. Background ========== XRay has two side tables we use at runtime to identify the location of the sleds for the functions

On Wed, Nov 22, 2017 at 10:37 AM, Dean Michael Berris <dean.berris at gmail.com> wrote: > > On 22 Nov 2017, at 02:32, comic fans <comicfans44 at gmail.com> wrote: > > with some dirty hack , I've made xray runtime 'built' on windows , > > > \o/ with more test, I've found that trampoline didn't got built for windows :/ currently cmake didn't

When a highly multi-threaded program such as nbdcopy encounters an error, there is a race condition in the library which can cause an assertion failure and thus a core dump: (1) An error occurs on one of the threads. nbdcopy calls exit(3). (2) In lib/errors.c, the destructor calls pthread_key_delete. (3) Another thread which is still running also encounters an error, and inside libnbd the

Hi, everyone: I am very sorry to trouble you, but I need your help about my problem about ThreadLocalImpl in llvm of 2.8 version. I have compiled it in Windows xp with mingw, and have compiled skyeye(an open source project about simulator) as it uses llvm. But when I run a testcase ---- arm_hello, it came out segment fault. I used gdb.exe to trace it, it gave the following infomation: $

This version simply removes the call to pthread_key_destroy. It fixes the problem and allows us to leave the asserts alone so we can still catch real errors. Of course this leaks pthread_key_t in the case where you dlclose() the library. glibc has a limit of 128 thread-specific keys (and the first 32 are somehow "fast" in a way I could quite follow), so that's a thing. Rich.

On Thu, Mar 09, 2023 at 08:44:51AM +0000, Richard W.M. Jones wrote: > When a highly multi-threaded program such as nbdcopy encounters an > error, there is a race condition in the library which can cause an > assertion failure and thus a core dump: > > (1) An error occurs on one of the threads. nbdcopy calls exit(3). > > (2) In lib/errors.c, the destructor calls

Hi, > I am very sorry to trouble you, but I need your help about my problem about > ThreadLocalImpl in llvm of 2.8 version. this is a very old version of LLVM, I suggest you try something newer, eg the recently released version 3.1. Best wishes, Duncan. I have compiled it in Windows xp with > mingw, and have compiled skyeye(an open source project about simulator) as it > uses

stubdom: fix and clean pthread minimal support Signed-off-by: Samuel Thibault <samuel.thibault@eu.citrix.com> diff -r f4a293cbec1b extras/mini-os/include/posix/pthread.h --- a/extras/mini-os/include/posix/pthread.h Thu May 22 14:28:40 2008 +0100 +++ b/extras/mini-os/include/posix/pthread.h Thu May 22 16:08:29 2008 +0100 @@ -1,18 +1,56 @@ #ifndef _POSIX_PTHREAD_H #define _POSIX_PTHREAD_H

Hi, As part of working on XRay, I'm trying to accomplish the following: create a section that contains an array of entries pertaining to the instrumentation map (nop sleds) in an object file, and have those merged into a single section in the final binary where the contents are concatenated. The trick though is I'd like to be able to reference the whole array with a single symbol (or two,

Awesome, thanks Peter! Cheers On Thu, Jun 23, 2016 at 10:35 AM Peter Collingbourne <peter at pcc.me.uk> wrote: > If you give your section a valid C identifier name, i.e. something like > "xray_instr_map" (no period), the linker will synthesize symbols named > "__start_xray_instr_map" and "__stop_xray_instr_map", which will point to > the start and

On Thu, Mar 09, 2023 at 09:50:00AM +0000, Richard W.M. Jones wrote: > When a highly multi-threaded program such as nbdcopy encounters an > error, there is a race condition in the library which can cause an > assertion failure and thus a core dump: > > (1) An error occurs on one of the threads. nbdcopy calls exit(3). > > (2) In lib/errors.c, the destructor calls

When a highly multi-threaded program such as nbdcopy encounters an error, there is a race condition in the library which can cause an assertion failure and thus a core dump: (1) An error occurs on one of the threads. nbdcopy calls exit(3). (2) In lib/errors.c, the destructor calls pthread_key_delete. (3) Another thread which is still running also encounters an error, and inside libnbd the

Just to close this out, I've updated http://reviews.llvm.org/D19904 to use named ELF groups per-function, and have the runtime library use __start_xray_instr_map and __stop_xray_instr_map as weak symbols from the C++ side. I've sent a patch to make creating these COMDAT/Group sections easier when lowering through the MCStreamer interface ( http://reviews.llvm.org/D21743). Cheers On Fri,

We know that in C++, the constructor of a static member will get called when the program starts up. I checked the generated IR code and found this is implemented by defining a __cxx_global_var_init() function and marked it as section ".text.startup" and assign it to @llvm.global_ctors. We also know that in C++, the constructor of a static thread_local member will *not* get called when

For everyone understand which code must be emitted to implement TLS, I will paste the code generated by gcc for a simple function: __thread int a = 1; int f(){ return a; } gcc teste.c -o teste.s -S -O2 (arm-linux-gnueabi): .global a .section .tdata,"awT",%progbits <== special section for tls symbols .align 2 .type a, %object

Sharing with the mailing list... Please, see below. On 9 January 2017 at 23:45, Serge Rogatch <serge.rogatch at gmail.com> wrote: > Hi Dean, > > I have seen that you removed the following code from ARMAsmPrinter.cpp in > revision 290858: > // Emit the XRay table for this function. > EmitXRayTable(); > > Was this done by mistake or on purpose? > > Without

Hi all, I would like to hear your thoughts on adding support for extending the IR to allow for explicitly selecting which model to use for thread-local storage of a variable. The motivation is to allow Clang to support the "tls_model" variable attribute [1], as requested in PR9788. The idea would be to extend the IR to allow an optional TLS-model argument to the thread_local

Hi Tom, Matt, I'm working on a project that needs few coherent atomic operations (HSA mode: load, store, compare-and-swap) for std::atomic_uint in HCC. the attached patch implements atomic compare and swap for SI+ (untested). I tried to stay within what was available, but there are few issues that I was unsure how to address: 1.) it currently uses v2i32 for both input and output. This

target triple = "i386-pc-linux-gnu" On 13/05/2010, at 9:25 PM, Anton Korobeynikov wrote: >> int (*FP)() = (int (*)())FPtr; >> int res = FP(); >> >> when the function executes correctly in the case of instead having created a standard global variable. > What is the platform you're running the code on? > > -- > With best regards, Anton