[compiler-rt] r250200 - [PGO]: Eliminate calls to __llvm_profile_register_function for Linux.

[Rafael Espíndola via llvm-commits]

BTW, is this working for shared libraries?

I ask because of https://sourceware.org/bugzilla/show_bug.cgi?id=19140

Cheers,
Rafael


On 13 October 2015 at 14:40, Xinliang David Li via llvm-commits
<llvm-commits at lists.llvm.org> wrote:
> Author: davidxl
> Date: Tue Oct 13 13:40:00 2015
> New Revision: 250200
>
> URL: http://llvm.org/viewvc/llvm-project?rev=250200&view=rev
> Log:
>
> [PGO]: Eliminate calls to __llvm_profile_register_function for Linux.
>
> On Linux, the profile runtime can use __start_SECTNAME and __stop_SECTNAME
> symbols defined by the linker to locate the start and end location of
> a named section (with C name). This eliminates the need for instrumented
> binary to call __llvm_profile_register_function during start-up time.
>
> Added:
>     compiler-rt/trunk/lib/profile/InstrProfilingPlatformLinux.c
> Modified:
>     compiler-rt/trunk/lib/profile/CMakeLists.txt
>     compiler-rt/trunk/lib/profile/InstrProfilingPlatformOther.c
>
> Modified: compiler-rt/trunk/lib/profile/CMakeLists.txt
> URL: http://llvm.org/viewvc/llvm-project/compiler-rt/trunk/lib/profile/CMakeLists.txt?rev=250200&r1=250199&r2=250200&view=diff
> ==============================================================================
> --- compiler-rt/trunk/lib/profile/CMakeLists.txt (original)
> +++ compiler-rt/trunk/lib/profile/CMakeLists.txt Tue Oct 13 13:40:00 2015
> @@ -6,6 +6,7 @@ set(PROFILE_SOURCES
>    InstrProfilingBuffer.c
>    InstrProfilingFile.c
>    InstrProfilingPlatformDarwin.c
> +  InstrProfilingPlatformLinux.c
>    InstrProfilingPlatformOther.c
>    InstrProfilingRuntime.cc
>    InstrProfilingUtil.c)
>
> Added: compiler-rt/trunk/lib/profile/InstrProfilingPlatformLinux.c
> URL: http://llvm.org/viewvc/llvm-project/compiler-rt/trunk/lib/profile/InstrProfilingPlatformLinux.c?rev=250200&view=auto
> ==============================================================================
> --- compiler-rt/trunk/lib/profile/InstrProfilingPlatformLinux.c (added)
> +++ compiler-rt/trunk/lib/profile/InstrProfilingPlatformLinux.c Tue Oct 13 13:40:00 2015
> @@ -0,0 +1,48 @@
> +/*===- InstrProfilingPlatformLinux.c - Profile data Linux platform ------===*\
> +|*
> +|*                     The LLVM Compiler Infrastructure
> +|*
> +|* This file is distributed under the University of Illinois Open Source
> +|* License. See LICENSE.TXT for details.
> +|*
> +\*===----------------------------------------------------------------------===*/
> +
> +#include "InstrProfiling.h"
> +
> +#if defined(__linux__)
> +#include <stdlib.h>
> +
> +extern __llvm_profile_data __start___llvm_prf_data
> +    __attribute__((visibility("hidden")));
> +extern __llvm_profile_data __stop___llvm_prf_data
> +    __attribute__((visibility("hidden")));
> +extern uint64_t __start___llvm_prf_cnts __attribute__((visibility("hidden")));
> +extern uint64_t __stop___llvm_prf_cnts __attribute__((visibility("hidden")));
> +extern char __start___llvm_prf_names __attribute__((visibility("hidden")));
> +extern char __stop___llvm_prf_names __attribute__((visibility("hidden")));
> +
> +__attribute__((visibility("hidden"))) const __llvm_profile_data *
> +__llvm_profile_begin_data(void) {
> +  return &__start___llvm_prf_data;
> +}
> +__attribute__((visibility("hidden"))) const __llvm_profile_data *
> +__llvm_profile_end_data(void) {
> +  return &__stop___llvm_prf_data;
> +}
> +__attribute__((visibility("hidden"))) const char *__llvm_profile_begin_names(
> +    void) {
> +  return &__start___llvm_prf_names;
> +}
> +__attribute__((visibility("hidden"))) const char *__llvm_profile_end_names(
> +    void) {
> +  return &__stop___llvm_prf_names;
> +}
> +__attribute__((visibility("hidden"))) uint64_t *__llvm_profile_begin_counters(
> +    void) {
> +  return &__start___llvm_prf_cnts;
> +}
> +__attribute__((visibility("hidden"))) uint64_t *__llvm_profile_end_counters(
> +    void) {
> +  return &__stop___llvm_prf_cnts;
> +}
> +#endif
>
> Modified: compiler-rt/trunk/lib/profile/InstrProfilingPlatformOther.c
> URL: http://llvm.org/viewvc/llvm-project/compiler-rt/trunk/lib/profile/InstrProfilingPlatformOther.c?rev=250200&r1=250199&r2=250200&view=diff
> ==============================================================================
> --- compiler-rt/trunk/lib/profile/InstrProfilingPlatformOther.c (original)
> +++ compiler-rt/trunk/lib/profile/InstrProfilingPlatformOther.c Tue Oct 13 13:40:00 2015
> @@ -9,7 +9,7 @@
>
>  #include "InstrProfiling.h"
>
> -#if !defined(__APPLE__)
> +#if !defined(__APPLE__) && !defined(__linux__)
>  #include <stdlib.h>
>
>  static const __llvm_profile_data *DataFirst = NULL;
>
>
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