search for: __start_xray_instr_map

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 end of the combined section. > > Peter > > On Thu, Jun 23, 2016 at 10:26 AM, Dean Michael Berris via llvm-dev < > llvm-dev at lists.llvm.org> wrote: > >> Hi, >> >> As part o...

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, Jun 24, 2016 at 4:23 AM Dean Michael Berris <dberris at google...

Dean Michael Berris via llvm-dev <llvm-dev at lists.llvm.org> writes: > 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. In case you're not aware, the __start_/__stop_ trick isn't portable. You may want to look at compiler-rt/lib/profile/InstrProfilingPlatform*.c. There, we do the __start_ trick for linux and freebsd, a similar trick for darwi...

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,

...ne based on chrono system_clock(ignore clockid_t) for tls destructor part, I've just commented them out.(but https://www.codeproject.com/Articles/8113/Thread-Local-Storage-The-C-Way gives a thread exit callback way for coff) and last thing , which I don't understand is the weak symbol for __start_xray_instr_map[] __stop_xray_instr_map[] __start_xray_fn_idx[] __stop_xray_fn_idx[] I replace them with __declspec(selectany) , but I'm not sure they have same meanings. some random generated code: .text .intel_syntax noprefix .def call; .scl 2; .type 32; .endef .g...

I'm learning the xray library and try if it can be built on windows, in xray_fdr_logging_impl.h line 152 , comment written as // Using pthread_once(...) to initialize the thread-local data structures but at line 175, 183, code written as thread_local pthread_key_t key; // Ensure that we only actually ever do the pthread initialization once. thread_local bool UNUSED Unused = [] {