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|
/*===- InstrProfiling.c - Support library for PGO instrumentation ---------===*\
|*
|* The LLVM Compiler Infrastructure
|*
|* This file is distributed under the University of Illinois Open Source
|* License. See LICENSE.TXT for details.
|*
\*===----------------------------------------------------------------------===*/
#include "InstrProfiling.h"
#include <limits.h>
#include <stdlib.h>
#include <string.h>
__attribute__((visibility("hidden")))
uint64_t __llvm_profile_get_magic(void) {
/* Magic number to detect file format and endianness.
*
* Use 255 at one end, since no UTF-8 file can use that character. Avoid 0,
* so that utilities, like strings, don't grab it as a string. 129 is also
* invalid UTF-8, and high enough to be interesting.
*
* Use "lprofr" in the centre to stand for "LLVM Profile Raw", or "lprofR"
* for 32-bit platforms.
*/
unsigned char R = sizeof(void *) == sizeof(uint64_t) ? 'r' : 'R';
return
(uint64_t)255 << 56 |
(uint64_t)'l' << 48 |
(uint64_t)'p' << 40 |
(uint64_t)'r' << 32 |
(uint64_t)'o' << 24 |
(uint64_t)'f' << 16 |
(uint64_t) R << 8 |
(uint64_t)129;
}
__attribute__((visibility("hidden")))
uint8_t __llvm_profile_get_num_padding_bytes(uint64_t SizeInBytes) {
return 7 & (sizeof(uint64_t) - SizeInBytes % sizeof(uint64_t));
}
__attribute__((visibility("hidden")))
uint64_t __llvm_profile_get_version(void) {
/* This should be bumped any time the output format changes. */
return 2;
}
__attribute__((visibility("hidden")))
void __llvm_profile_reset_counters(void) {
uint64_t *I = __llvm_profile_begin_counters();
uint64_t *E = __llvm_profile_end_counters();
memset(I, 0, sizeof(uint64_t)*(E - I));
const __llvm_profile_data *DataBegin = __llvm_profile_begin_data();
const __llvm_profile_data *DataEnd = __llvm_profile_end_data();
for (const __llvm_profile_data *DI = DataBegin; DI != DataEnd; ++DI) {
if (!DI->ValueCounters)
continue;
uint64_t CurrentVSiteCount = 0;
for (uint32_t VKI = VK_FIRST; VKI <= VK_LAST; ++VKI)
CurrentVSiteCount += DI->NumValueSites[VKI];
for (uint32_t i = 0; i < CurrentVSiteCount; ++i) {
__llvm_profile_value_node *CurrentVNode = DI->ValueCounters[i];
while (CurrentVNode) {
CurrentVNode->VData.NumTaken = 0;
CurrentVNode = CurrentVNode->Next;
}
}
}
}
static uint64_t TotalValueDataSize = 0;
__attribute__((visibility("hidden")))
void __llvm_profile_instrument_target(uint64_t TargetValue, void *Data_,
uint32_t CounterIndex) {
__llvm_profile_data *Data = (__llvm_profile_data*)Data_;
if (!Data)
return;
if (!Data->ValueCounters) {
uint64_t NumVSites = 0;
for (uint32_t VKI = VK_FIRST; VKI <= VK_LAST; ++VKI)
NumVSites += Data->NumValueSites[VKI];
__llvm_profile_value_node** Mem = (__llvm_profile_value_node**)
calloc(NumVSites, sizeof(__llvm_profile_value_node*));
if (!Mem)
return;
if (!__sync_bool_compare_and_swap(&Data->ValueCounters, 0, Mem)) {
free(Mem);
return;
}
// Acccount for padding during write out.
uint8_t Padding = __llvm_profile_get_num_padding_bytes(NumVSites);
__sync_fetch_and_add(&TotalValueDataSize, NumVSites + Padding);
}
__llvm_profile_value_node *PrevVNode = NULL;
__llvm_profile_value_node *CurrentVNode = Data->ValueCounters[CounterIndex];
uint8_t VDataCount = 0;
while (CurrentVNode) {
if (TargetValue == CurrentVNode->VData.TargetValue) {
CurrentVNode->VData.NumTaken++;
return;
}
PrevVNode = CurrentVNode;
CurrentVNode = CurrentVNode->Next;
++VDataCount;
}
if (VDataCount >= UCHAR_MAX)
return;
CurrentVNode = (__llvm_profile_value_node*)
calloc(1, sizeof(__llvm_profile_value_node));
if (!CurrentVNode)
return;
CurrentVNode->VData.TargetValue = TargetValue;
CurrentVNode->VData.NumTaken++;
uint32_t Success = 0;
if (!Data->ValueCounters[CounterIndex])
Success = __sync_bool_compare_and_swap(
&(Data->ValueCounters[CounterIndex]), 0, CurrentVNode);
else if (PrevVNode && !PrevVNode->Next)
Success = __sync_bool_compare_and_swap(&(PrevVNode->Next), 0, CurrentVNode);
if (!Success) {
free(CurrentVNode);
return;
}
__sync_fetch_and_add(&TotalValueDataSize,
Success * sizeof(__llvm_profile_value_data));
}
__attribute__((visibility("hidden")))
uint64_t __llvm_profile_gather_value_data(uint8_t **VDataArray) {
if (!VDataArray || 0 == TotalValueDataSize)
return 0;
uint64_t NumData = TotalValueDataSize;
*VDataArray = (uint8_t*) calloc(NumData, sizeof(uint8_t));
if (!*VDataArray)
return 0;
uint8_t *VDataEnd = *VDataArray + NumData;
uint8_t *PerSiteCountsHead = *VDataArray;
const __llvm_profile_data *DataEnd = __llvm_profile_end_data();
const __llvm_profile_data *DataBegin = __llvm_profile_begin_data();
for (__llvm_profile_data *I = (__llvm_profile_data *)DataBegin;
I != DataEnd; ++I) {
if (!I->ValueCounters)
continue;
uint64_t NumVSites = 0;
for (uint32_t VKI = VK_FIRST; VKI <= VK_LAST; ++VKI)
NumVSites += I->NumValueSites[VKI];
uint8_t Padding = __llvm_profile_get_num_padding_bytes(NumVSites);
uint8_t *PerSiteCountPtr = PerSiteCountsHead;
__llvm_profile_value_data *VDataPtr =
(__llvm_profile_value_data *)(PerSiteCountPtr + NumVSites + Padding);
for (uint32_t i = 0; i < NumVSites; ++i) {
__llvm_profile_value_node *VNode = I->ValueCounters[i];
uint8_t VDataCount = 0;
while (VNode && ((uint8_t*)(VDataPtr + 1) <= VDataEnd)) {
*VDataPtr = VNode->VData;
VNode = VNode->Next;
++VDataPtr;
if (++VDataCount == UCHAR_MAX)
break;
}
*PerSiteCountPtr = VDataCount;
++PerSiteCountPtr;
}
I->ValueCounters = (void *)PerSiteCountsHead;
PerSiteCountsHead = (uint8_t *)VDataPtr;
}
return PerSiteCountsHead - *VDataArray;
}
|
