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 23 COMPILER_RT_VISIBILITY uint64_t __llvm_profile_get_magic(void) { 24 return sizeof(void *) == sizeof(uint64_t) ? (INSTR_PROF_RAW_MAGIC_64) 25 : (INSTR_PROF_RAW_MAGIC_32); 26 } 27 28 COMPILER_RT_VISIBILITY void __llvm_profile_set_dumped(void) { 29 lprofSetProfileDumped(1); 30 } 31 32 /* Return the number of bytes needed to add to SizeInBytes to make it 33 * the result a multiple of 8. 34 */ 35 COMPILER_RT_VISIBILITY uint8_t 36 __llvm_profile_get_num_padding_bytes(uint64_t SizeInBytes) { 37 return 7 & (sizeof(uint64_t) - SizeInBytes % sizeof(uint64_t)); 38 } 39 40 COMPILER_RT_VISIBILITY uint64_t __llvm_profile_get_version(void) { 41 return INSTR_PROF_RAW_VERSION_VAR; 42 } 43 44 COMPILER_RT_VISIBILITY void __llvm_profile_reset_counters(void) { 45 char *I = __llvm_profile_begin_counters(); 46 char *E = __llvm_profile_end_counters(); 47 48 char ResetValue = 49 (__llvm_profile_get_version() & VARIANT_MASK_BYTE_COVERAGE) ? 0xFF : 0; 50 memset(I, ResetValue, E - I); 51 52 const __llvm_profile_data *DataBegin = __llvm_profile_begin_data(); 53 const __llvm_profile_data *DataEnd = __llvm_profile_end_data(); 54 const __llvm_profile_data *DI; 55 for (DI = DataBegin; DI < DataEnd; ++DI) { 56 uint64_t CurrentVSiteCount = 0; 57 uint32_t VKI, i; 58 if (!DI->Values) 59 continue; 60 61 ValueProfNode **ValueCounters = (ValueProfNode **)DI->Values; 62 63 for (VKI = IPVK_First; VKI <= IPVK_Last; ++VKI) 64 CurrentVSiteCount += DI->NumValueSites[VKI]; 65 66 for (i = 0; i < CurrentVSiteCount; ++i) { 67 ValueProfNode *CurrentVNode = ValueCounters[i]; 68 69 while (CurrentVNode) { 70 CurrentVNode->Count = 0; 71 CurrentVNode = CurrentVNode->Next; 72 } 73 } 74 } 75 lprofSetProfileDumped(0); 76 } 77