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hanchenye-llvm-project/compiler-rt/lib/profile/InstrProfilingPlatformLinux.c

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[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. llvm-svn: 250200
2015-10-14 02:40:00 +08:00
/*===- 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"
[PGO] Eliminate prof data register calls on FreeBSD platform This is a follow up patch of r250199 after verifying the start/stop section symbols work as spected on FreeBSD. llvm-svn: 250680
2015-10-19 12:17:19 +08:00
#if defined(__linux__) || defined(__FreeBSD__)
[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. llvm-svn: 250200
2015-10-14 02:40:00 +08:00
#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