lib/profile/InstrProfilingPlatformLinux.c

/*===- InstrProfilingPlatformLinux.c - Profile data Linux platform ------===*\
|*
|* Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
|* See https://llvm.org/LICENSE.txt for license information.
|* SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
|*
\*===----------------------------------------------------------------------===*/

#if defined(__linux__) || defined(__FreeBSD__) || defined(__Fuchsia__) || \
    (defined(__sun__) && defined(__svr4__)) || defined(__NetBSD__)

#include <stdlib.h>

#include "InstrProfiling.h"

#define PROF_DATA_START INSTR_PROF_SECT_START(INSTR_PROF_DATA_COMMON)
#define PROF_DATA_STOP INSTR_PROF_SECT_STOP(INSTR_PROF_DATA_COMMON)
#define PROF_NAME_START INSTR_PROF_SECT_START(INSTR_PROF_NAME_COMMON)
#define PROF_NAME_STOP INSTR_PROF_SECT_STOP(INSTR_PROF_NAME_COMMON)
#define PROF_CNTS_START INSTR_PROF_SECT_START(INSTR_PROF_CNTS_COMMON)
#define PROF_CNTS_STOP INSTR_PROF_SECT_STOP(INSTR_PROF_CNTS_COMMON)
#define PROF_ORDERFILE_START INSTR_PROF_SECT_START(INSTR_PROF_ORDERFILE_COMMON)
#define PROF_VNODES_START INSTR_PROF_SECT_START(INSTR_PROF_VNODES_COMMON)
#define PROF_VNODES_STOP INSTR_PROF_SECT_STOP(INSTR_PROF_VNODES_COMMON)

/* Declare section start and stop symbols for various sections
 * generated by compiler instrumentation.
 */
extern __llvm_profile_data PROF_DATA_START COMPILER_RT_VISIBILITY;
extern __llvm_profile_data PROF_DATA_STOP COMPILER_RT_VISIBILITY;
extern uint64_t PROF_CNTS_START COMPILER_RT_VISIBILITY;
extern uint64_t PROF_CNTS_STOP COMPILER_RT_VISIBILITY;
extern uint32_t PROF_ORDERFILE_START COMPILER_RT_VISIBILITY;
extern char PROF_NAME_START COMPILER_RT_VISIBILITY;
extern char PROF_NAME_STOP COMPILER_RT_VISIBILITY;
extern ValueProfNode PROF_VNODES_START COMPILER_RT_VISIBILITY;
extern ValueProfNode PROF_VNODES_STOP COMPILER_RT_VISIBILITY;

/* Add dummy data to ensure the section is always created. Add used attribute so
 * that they are linker GC roots on supported ELF platforms.
 */
__llvm_profile_data __prof_data_sect_data[0] COMPILER_RT_SECTION(
    INSTR_PROF_DATA_SECT_NAME) COMPILER_RT_USED;
uint64_t __prof_cnts_sect_data[0] COMPILER_RT_SECTION(INSTR_PROF_CNTS_SECT_NAME)
    COMPILER_RT_USED;
uint32_t __prof_orderfile_sect_data[0] COMPILER_RT_SECTION(
    INSTR_PROF_ORDERFILE_SECT_NAME) COMPILER_RT_USED;
const char __prof_nms_sect_data[0] COMPILER_RT_SECTION(
    INSTR_PROF_NAME_SECT_NAME) COMPILER_RT_USED;
ValueProfNode __prof_vnodes_sect_data[0] COMPILER_RT_SECTION(
    INSTR_PROF_VNODES_SECT_NAME) COMPILER_RT_USED;

COMPILER_RT_VISIBILITY const __llvm_profile_data *
__llvm_profile_begin_data(void) {
  return &PROF_DATA_START;
}
COMPILER_RT_VISIBILITY const __llvm_profile_data *
__llvm_profile_end_data(void) {
  return &PROF_DATA_STOP;
}
COMPILER_RT_VISIBILITY const char *__llvm_profile_begin_names(void) {
  return &PROF_NAME_START;
}
COMPILER_RT_VISIBILITY const char *__llvm_profile_end_names(void) {
  return &PROF_NAME_STOP;
}
COMPILER_RT_VISIBILITY uint64_t *__llvm_profile_begin_counters(void) {
  return &PROF_CNTS_START;
}
COMPILER_RT_VISIBILITY uint64_t *__llvm_profile_end_counters(void) {
  return &PROF_CNTS_STOP;
}
COMPILER_RT_VISIBILITY uint32_t *__llvm_profile_begin_orderfile(void) {
  return &PROF_ORDERFILE_START;
}

COMPILER_RT_VISIBILITY ValueProfNode *
__llvm_profile_begin_vnodes(void) {
  return &PROF_VNODES_START;
}
COMPILER_RT_VISIBILITY ValueProfNode *__llvm_profile_end_vnodes(void) {
  return &PROF_VNODES_STOP;
}
COMPILER_RT_VISIBILITY ValueProfNode *CurrentVNode = &PROF_VNODES_START;
COMPILER_RT_VISIBILITY ValueProfNode *EndVNode = &PROF_VNODES_STOP;

#endif