1/*===- InstrProfiling.c - Support library for PGO instrumentation ---------===*\
2|*
3|* Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4|* See https://llvm.org/LICENSE.txt for license information.
5|* SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6|*
7\*===----------------------------------------------------------------------===*/
8
9// Note: This is linked into the Darwin kernel, and must remain compatible
10// with freestanding compilation. See `darwin_add_builtin_libraries`.
11
12#include <limits.h>
13#include <stdio.h>
14#include <stdlib.h>
15#include <string.h>
16
17#include "InstrProfiling.h"
18#include "InstrProfilingInternal.h"
19
20#define INSTR_PROF_VALUE_PROF_DATA
21#include "profile/InstrProfData.inc"
22
23static uint32_t __llvm_profile_global_timestamp = 1;
24
25COMPILER_RT_VISIBILITY
26void INSTR_PROF_PROFILE_SET_TIMESTAMP(uint64_t *Probe) {
27 if (*Probe == 0 || *Probe == (uint64_t)-1)
28 *Probe = __llvm_profile_global_timestamp++;
29}
30
31COMPILER_RT_VISIBILITY uint64_t __llvm_profile_get_magic(void) {
32 return sizeof(void *) == sizeof(uint64_t) ? (INSTR_PROF_RAW_MAGIC_64)
33 : (INSTR_PROF_RAW_MAGIC_32);
34}
35
36COMPILER_RT_VISIBILITY void __llvm_profile_set_dumped(void) {
37 lprofSetProfileDumped(1);
38}
39
40/* Return the number of bytes needed to add to SizeInBytes to make it
41 * the result a multiple of 8.
42 */
43COMPILER_RT_VISIBILITY uint8_t
44__llvm_profile_get_num_padding_bytes(uint64_t SizeInBytes) {
45 return 7 & (sizeof(uint64_t) - SizeInBytes % sizeof(uint64_t));
46}
47
48COMPILER_RT_VISIBILITY uint64_t __llvm_profile_get_version(void) {
49 return INSTR_PROF_RAW_VERSION_VAR;
50}
51
52COMPILER_RT_VISIBILITY void __llvm_profile_reset_counters(void) {
53 if (__llvm_profile_get_version() & VARIANT_MASK_TEMPORAL_PROF)
54 __llvm_profile_global_timestamp = 1;
55
56 char *I = __llvm_profile_begin_counters();
57 char *E = __llvm_profile_end_counters();
58
59 char ResetValue =
60 (__llvm_profile_get_version() & VARIANT_MASK_BYTE_COVERAGE) ? 0xFF : 0;
61 memset(s: I, c: ResetValue, n: E - I);
62
63 I = __llvm_profile_begin_bitmap();
64 E = __llvm_profile_end_bitmap();
65 memset(s: I, c: 0x0, n: E - I);
66
67 const __llvm_profile_data *DataBegin = __llvm_profile_begin_data();
68 const __llvm_profile_data *DataEnd = __llvm_profile_end_data();
69 const __llvm_profile_data *DI;
70 for (DI = DataBegin; DI < DataEnd; ++DI) {
71 uint64_t CurrentVSiteCount = 0;
72 uint32_t VKI, i;
73 if (!DI->Values)
74 continue;
75
76 ValueProfNode **ValueCounters = (ValueProfNode **)DI->Values;
77
78 for (VKI = IPVK_First; VKI <= IPVK_Last; ++VKI)
79 CurrentVSiteCount += DI->NumValueSites[VKI];
80
81 for (i = 0; i < CurrentVSiteCount; ++i) {
82 ValueProfNode *CurrVNode = ValueCounters[i];
83
84 while (CurrVNode) {
85 CurrVNode->Count = 0;
86 CurrVNode = CurrVNode->Next;
87 }
88 }
89 }
90 lprofSetProfileDumped(0);
91}
92

source code of compiler-rt/lib/profile/InstrProfiling.c