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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>
typedef struct ValueProfNode {
__llvm_profile_value_data VData;
struct ValueProfNode *Next;
} ValueProfNode;
__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;
}
/* Return the number of bytes needed to add to SizeInBytes to make it
* the result a multiple of 8.
*/
__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();
const __llvm_profile_data *DI;
for (DI = DataBegin; DI != DataEnd; ++DI) {
uint64_t CurrentVSiteCount = 0;
uint32_t VKI, i;
if (!DI->Values)
continue;
ValueProfNode **ValueCounters = (ValueProfNode **)DI->Values;
for (VKI = IPVK_First; VKI <= IPVK_Last; ++VKI)
CurrentVSiteCount += DI->NumValueSites[VKI];
for (i = 0; i < CurrentVSiteCount; ++i) {
ValueProfNode *CurrentVNode = ValueCounters[i];
while (CurrentVNode) {
CurrentVNode->VData.NumTaken = 0;
CurrentVNode = CurrentVNode->Next;
}
}
}
}
/* Total number of value profile data in bytes. */
static uint64_t TotalValueDataSize = 0;
#ifdef _MIPS_ARCH
__attribute__((visibility("hidden"))) void
__llvm_profile_instrument_target(uint64_t TargetValue, void *Data_,
uint32_t CounterIndex) {
}
#else
/* Allocate an array that holds the pointers to the linked lists of
* value profile counter nodes. The number of element of the array
* is the total number of value profile sites instrumented. Returns
* 0 if allocation fails.
*/
static int allocateValueProfileCounters(__llvm_profile_data *Data) {
uint64_t NumVSites = 0;
uint32_t VKI;
for (VKI = IPVK_First; VKI <= IPVK_Last; ++VKI)
NumVSites += Data->NumValueSites[VKI];
ValueProfNode **Mem =
(ValueProfNode **)calloc(NumVSites, sizeof(ValueProfNode *));
if (!Mem)
return 0;
if (!__sync_bool_compare_and_swap(&Data->Values, 0, Mem)) {
free(Mem);
return 0;
}
/* In the raw format, there will be an value count array preceding
* the value profile data. The element type of the array is uint8_t,
* and there is one element in array per value site. The element
* stores the number of values profiled for the corresponding site.
*/
uint8_t Padding = __llvm_profile_get_num_padding_bytes(NumVSites);
__sync_fetch_and_add(&TotalValueDataSize, NumVSites + Padding);
return 1;
}
__attribute__((visibility("hidden"))) void
__llvm_profile_instrument_target(uint64_t TargetValue, void *Data,
uint32_t CounterIndex) {
__llvm_profile_data *VData = (__llvm_profile_data *)Data;
if (!VData)
return;
if (!VData->Values) {
if (!allocateValueProfileCounters(VData))
return;
}
ValueProfNode **ValueCounters = (ValueProfNode **)VData->Values;
ValueProfNode *PrevVNode = NULL;
ValueProfNode *CurrentVNode = 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 = (ValueProfNode *)calloc(1, sizeof(ValueProfNode));
if (!CurrentVNode)
return;
CurrentVNode->VData.TargetValue = TargetValue;
CurrentVNode->VData.NumTaken++;
uint32_t Success = 0;
if (!ValueCounters[CounterIndex])
Success = __sync_bool_compare_and_swap(&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(ValueProfNode));
}
#endif
__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();
__llvm_profile_data *I;
for (I = (__llvm_profile_data *)DataBegin; I != DataEnd; ++I) {
uint64_t NumVSites = 0;
uint32_t VKI, i;
if (!I->Values)
continue;
ValueProfNode **ValueCounters = (ValueProfNode **)I->Values;
for (VKI = IPVK_First; VKI <= IPVK_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 (i = 0; i < NumVSites; ++i) {
ValueProfNode *VNode = 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->Values = (void *)PerSiteCountsHead;
PerSiteCountsHead = (uint8_t *)VDataPtr;
}
return PerSiteCountsHead - *VDataArray;
}
|
