1 /*===- InstrProfilingMerge.c - Profile in-process Merging ---------------===*\ 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 |* This file defines the API needed for in-process merging of profile data 9 |* stored in memory buffer. 10 \*===---------------------------------------------------------------------===*/ 11 12 #include "InstrProfiling.h" 13 #include "InstrProfilingInternal.h" 14 #include "InstrProfilingUtil.h" 15 16 #define INSTR_PROF_VALUE_PROF_DATA 17 #include "profile/InstrProfData.inc" 18 19 COMPILER_RT_VISIBILITY 20 void (*VPMergeHook)(ValueProfData *, __llvm_profile_data *); 21 22 COMPILER_RT_VISIBILITY 23 uint64_t lprofGetLoadModuleSignature() { 24 /* A very fast way to compute a module signature. */ 25 uint64_t Version = __llvm_profile_get_version(); 26 uint64_t CounterSize = (uint64_t)(__llvm_profile_end_counters() - 27 __llvm_profile_begin_counters()); 28 uint64_t DataSize = __llvm_profile_get_data_size(__llvm_profile_begin_data(), 29 __llvm_profile_end_data()); 30 uint64_t NamesSize = 31 (uint64_t)(__llvm_profile_end_names() - __llvm_profile_begin_names()); 32 uint64_t NumVnodes = 33 (uint64_t)(__llvm_profile_end_vnodes() - __llvm_profile_begin_vnodes()); 34 const __llvm_profile_data *FirstD = __llvm_profile_begin_data(); 35 36 return (NamesSize << 40) + (CounterSize << 30) + (DataSize << 20) + 37 (NumVnodes << 10) + (DataSize > 0 ? FirstD->NameRef : 0) + Version; 38 } 39 40 /* Returns 1 if profile is not structurally compatible. */ 41 COMPILER_RT_VISIBILITY 42 int __llvm_profile_check_compatibility(const char *ProfileData, 43 uint64_t ProfileSize) { 44 /* Check profile header only for now */ 45 __llvm_profile_header *Header = (__llvm_profile_header *)ProfileData; 46 __llvm_profile_data *SrcDataStart, *SrcDataEnd, *SrcData, *DstData; 47 SrcDataStart = 48 (__llvm_profile_data *)(ProfileData + sizeof(__llvm_profile_header) + 49 Header->BinaryIdsSize); 50 SrcDataEnd = SrcDataStart + Header->DataSize; 51 52 if (ProfileSize < sizeof(__llvm_profile_header)) 53 return 1; 54 55 /* Check the header first. */ 56 if (Header->Magic != __llvm_profile_get_magic() || 57 Header->Version != __llvm_profile_get_version() || 58 Header->DataSize != 59 __llvm_profile_get_data_size(__llvm_profile_begin_data(), 60 __llvm_profile_end_data()) || 61 Header->CountersSize != (uint64_t)(__llvm_profile_end_counters() - 62 __llvm_profile_begin_counters()) || 63 Header->NamesSize != (uint64_t)(__llvm_profile_end_names() - 64 __llvm_profile_begin_names()) || 65 Header->ValueKindLast != IPVK_Last) 66 return 1; 67 68 if (ProfileSize < sizeof(__llvm_profile_header) + Header->BinaryIdsSize + 69 Header->DataSize * sizeof(__llvm_profile_data) + 70 Header->NamesSize + Header->CountersSize) 71 return 1; 72 73 for (SrcData = SrcDataStart, 74 DstData = (__llvm_profile_data *)__llvm_profile_begin_data(); 75 SrcData < SrcDataEnd; ++SrcData, ++DstData) { 76 if (SrcData->NameRef != DstData->NameRef || 77 SrcData->FuncHash != DstData->FuncHash || 78 SrcData->NumCounters != DstData->NumCounters) 79 return 1; 80 } 81 82 /* Matched! */ 83 return 0; 84 } 85 86 static uintptr_t signextIfWin64(void *V) { 87 #ifdef _WIN64 88 return (uintptr_t)(int32_t)(uintptr_t)V; 89 #else 90 return (uintptr_t)V; 91 #endif 92 } 93 94 COMPILER_RT_VISIBILITY 95 int __llvm_profile_merge_from_buffer(const char *ProfileData, 96 uint64_t ProfileSize) { 97 __llvm_profile_data *SrcDataStart, *SrcDataEnd, *SrcData, *DstData; 98 __llvm_profile_header *Header = (__llvm_profile_header *)ProfileData; 99 uint64_t *SrcCountersStart; 100 const char *SrcNameStart; 101 const char *SrcValueProfDataStart, *SrcValueProfData; 102 uintptr_t CountersDelta = Header->CountersDelta; 103 104 SrcDataStart = 105 (__llvm_profile_data *)(ProfileData + sizeof(__llvm_profile_header) + 106 Header->BinaryIdsSize); 107 SrcDataEnd = SrcDataStart + Header->DataSize; 108 SrcCountersStart = (uint64_t *)SrcDataEnd; 109 SrcNameStart = (const char *)(SrcCountersStart + Header->CountersSize); 110 SrcValueProfDataStart = 111 SrcNameStart + Header->NamesSize + 112 __llvm_profile_get_num_padding_bytes(Header->NamesSize); 113 if (SrcNameStart < (const char *)SrcCountersStart) 114 return 1; 115 116 for (SrcData = SrcDataStart, 117 DstData = (__llvm_profile_data *)__llvm_profile_begin_data(), 118 SrcValueProfData = SrcValueProfDataStart; 119 SrcData < SrcDataEnd; ++SrcData, ++DstData) { 120 // For the in-memory destination, CounterPtr is the distance from the start 121 // address of the data to the start address of the counter. On WIN64, 122 // CounterPtr is a truncated 32-bit value due to COFF limitation. Sign 123 // extend CounterPtr to get the original value. 124 uint64_t *DstCounters = 125 (uint64_t *)((uintptr_t)DstData + signextIfWin64(DstData->CounterPtr)); 126 unsigned NVK = 0; 127 128 // SrcData is a serialized representation of the memory image. We need to 129 // compute the in-buffer counter offset from the in-memory address distance. 130 // The initial CountersDelta is the in-memory address difference 131 // start(__llvm_prf_cnts)-start(__llvm_prf_data), so SrcData->CounterPtr - 132 // CountersDelta computes the offset into the in-buffer counter section. 133 // 134 // On WIN64, CountersDelta is truncated as well, so no need for signext. 135 uint64_t *SrcCounters = 136 SrcCountersStart + 137 ((uintptr_t)SrcData->CounterPtr - CountersDelta) / sizeof(uint64_t); 138 // CountersDelta needs to be decreased as we advance to the next data 139 // record. 140 CountersDelta -= sizeof(*SrcData); 141 unsigned NC = SrcData->NumCounters; 142 if (NC == 0) 143 return 1; 144 if (SrcCounters < SrcCountersStart || 145 (const char *)SrcCounters >= SrcNameStart || 146 (const char *)(SrcCounters + NC) > SrcNameStart) 147 return 1; 148 for (unsigned I = 0; I < NC; I++) 149 DstCounters[I] += SrcCounters[I]; 150 151 /* Now merge value profile data. */ 152 if (!VPMergeHook) 153 continue; 154 155 for (unsigned I = 0; I <= IPVK_Last; I++) 156 NVK += (SrcData->NumValueSites[I] != 0); 157 158 if (!NVK) 159 continue; 160 161 if (SrcValueProfData >= ProfileData + ProfileSize) 162 return 1; 163 VPMergeHook((ValueProfData *)SrcValueProfData, DstData); 164 SrcValueProfData = 165 SrcValueProfData + ((ValueProfData *)SrcValueProfData)->TotalSize; 166 } 167 168 return 0; 169 } 170