src/libcompiler_builtins/compiler-rt/lib/profile/InstrProfiling.c

   1 /*===- InstrProfiling.c - Support library for PGO instrumentation ---------===*\
   2 |*
   3 |*                     The LLVM Compiler Infrastructure
   4 |*
   5 |* This file is distributed under the University of Illinois Open Source
   6 |* License. See LICENSE.TXT for details.
   7 |*
   8 \*===----------------------------------------------------------------------===*/
   9
  10 #include "InstrProfiling.h"
  11 #include "InstrProfilingInternal.h"
  12 #include <limits.h>
  13 #include <stdio.h>
  14 #include <stdlib.h>
  15 #include <string.h>
  16 #define INSTR_PROF_VALUE_PROF_DATA
  17 #include "InstrProfData.inc"
  18
  19
  20 COMPILER_RT_WEAK uint64_t INSTR_PROF_RAW_VERSION_VAR = INSTR_PROF_RAW_VERSION;
  21
  22 COMPILER_RT_WEAK char INSTR_PROF_PROFILE_NAME_VAR[1] = {0};
  23
  24 COMPILER_RT_VISIBILITY uint64_t __llvm_profile_get_magic(void) {
  25   return sizeof(void *) == sizeof(uint64_t) ? (INSTR_PROF_RAW_MAGIC_64)
  26                                             : (INSTR_PROF_RAW_MAGIC_32);
  27 }
  28
  29 static unsigned ProfileDumped = 0;
  30
  31 COMPILER_RT_VISIBILITY unsigned lprofProfileDumped() {
  32   return ProfileDumped;
  33 }
  34
  35 COMPILER_RT_VISIBILITY void lprofSetProfileDumped() {
  36   ProfileDumped = 1;
  37 }
  38
  39 /* Return the number of bytes needed to add to SizeInBytes to make it
  40  *   the result a multiple of 8.
  41  */
  42 COMPILER_RT_VISIBILITY uint8_t
  43 __llvm_profile_get_num_padding_bytes(uint64_t SizeInBytes) {
  44   return 7 & (sizeof(uint64_t) - SizeInBytes % sizeof(uint64_t));
  45 }
  46
  47 COMPILER_RT_VISIBILITY uint64_t __llvm_profile_get_version(void) {
  48   return __llvm_profile_raw_version;
  49 }
  50
  51 COMPILER_RT_VISIBILITY void __llvm_profile_reset_counters(void) {
  52   uint64_t *I = __llvm_profile_begin_counters();
  53   uint64_t *E = __llvm_profile_end_counters();
  54
  55   memset(I, 0, sizeof(uint64_t) * (E - I));
  56
  57   const __llvm_profile_data *DataBegin = __llvm_profile_begin_data();
  58   const __llvm_profile_data *DataEnd = __llvm_profile_end_data();
  59   const __llvm_profile_data *DI;
  60   for (DI = DataBegin; DI < DataEnd; ++DI) {
  61     uint64_t CurrentVSiteCount = 0;
  62     uint32_t VKI, i;
  63     if (!DI->Values)
  64       continue;
  65
  66     ValueProfNode **ValueCounters = (ValueProfNode **)DI->Values;
  67
  68     for (VKI = IPVK_First; VKI <= IPVK_Last; ++VKI)
  69       CurrentVSiteCount += DI->NumValueSites[VKI];
  70
  71     for (i = 0; i < CurrentVSiteCount; ++i) {
  72       ValueProfNode *CurrentVNode = ValueCounters[i];
  73
  74       while (CurrentVNode) {
  75         CurrentVNode->Count = 0;
  76         CurrentVNode = CurrentVNode->Next;
  77       }
  78     }
  79   }
  80   ProfileDumped = 0;
  81 }