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 __llvm_profile_get_magic(); 39 } 40 41 /* Returns 1 if profile is not structurally compatible. */ 42 COMPILER_RT_VISIBILITY 43 int __llvm_profile_check_compatibility(const char *ProfileData, 44 uint64_t ProfileSize) { 45 /* Check profile header only for now */ 46 __llvm_profile_header *Header = (__llvm_profile_header *)ProfileData; 47 __llvm_profile_data *SrcDataStart, *SrcDataEnd, *SrcData, *DstData; 48 SrcDataStart = 49 (__llvm_profile_data *)(ProfileData + sizeof(__llvm_profile_header) + 50 Header->BinaryIdsSize); 51 SrcDataEnd = SrcDataStart + Header->DataSize; 52 53 if (ProfileSize < sizeof(__llvm_profile_header)) 54 return 1; 55 56 /* Check the header first. */ 57 if (Header->Magic != __llvm_profile_get_magic() || 58 Header->Version != __llvm_profile_get_version() || 59 Header->DataSize != 60 __llvm_profile_get_data_size(__llvm_profile_begin_data(), 61 __llvm_profile_end_data()) || 62 Header->CountersSize != (uint64_t)(__llvm_profile_end_counters() - 63 __llvm_profile_begin_counters()) || 64 Header->NamesSize != (uint64_t)(__llvm_profile_end_names() - 65 __llvm_profile_begin_names()) || 66 Header->ValueKindLast != IPVK_Last) 67 return 1; 68 69 if (ProfileSize < sizeof(__llvm_profile_header) + Header->BinaryIdsSize + 70 Header->DataSize * sizeof(__llvm_profile_data) + 71 Header->NamesSize + Header->CountersSize) 72 return 1; 73 74 for (SrcData = SrcDataStart, 75 DstData = (__llvm_profile_data *)__llvm_profile_begin_data(); 76 SrcData < SrcDataEnd; ++SrcData, ++DstData) { 77 if (SrcData->NameRef != DstData->NameRef || 78 SrcData->FuncHash != DstData->FuncHash || 79 SrcData->NumCounters != DstData->NumCounters) 80 return 1; 81 } 82 83 /* Matched! */ 84 return 0; 85 } 86 87 static uintptr_t signextIfWin64(void *V) { 88 #ifdef _WIN64 89 return (uintptr_t)(int32_t)(uintptr_t)V; 90 #else 91 return (uintptr_t)V; 92 #endif 93 } 94 95 COMPILER_RT_VISIBILITY 96 int __llvm_profile_merge_from_buffer(const char *ProfileData, 97 uint64_t ProfileSize) { 98 if (__llvm_profile_get_version() & VARIANT_MASK_DBG_CORRELATE) { 99 PROF_ERR( 100 "%s\n", 101 "Debug info correlation does not support profile merging at runtime. " 102 "Instead, merge raw profiles using the llvm-profdata tool."); 103 return 1; 104 } 105 106 __llvm_profile_data *SrcDataStart, *SrcDataEnd, *SrcData, *DstData; 107 __llvm_profile_header *Header = (__llvm_profile_header *)ProfileData; 108 uint64_t *SrcCountersStart; 109 const char *SrcNameStart; 110 const char *SrcValueProfDataStart, *SrcValueProfData; 111 uintptr_t CountersDelta = Header->CountersDelta; 112 113 SrcDataStart = 114 (__llvm_profile_data *)(ProfileData + sizeof(__llvm_profile_header) + 115 Header->BinaryIdsSize); 116 SrcDataEnd = SrcDataStart + Header->DataSize; 117 SrcCountersStart = (uint64_t *)SrcDataEnd; 118 SrcNameStart = (const char *)(SrcCountersStart + Header->CountersSize); 119 SrcValueProfDataStart = 120 SrcNameStart + Header->NamesSize + 121 __llvm_profile_get_num_padding_bytes(Header->NamesSize); 122 if (SrcNameStart < (const char *)SrcCountersStart) 123 return 1; 124 125 for (SrcData = SrcDataStart, 126 DstData = (__llvm_profile_data *)__llvm_profile_begin_data(), 127 SrcValueProfData = SrcValueProfDataStart; 128 SrcData < SrcDataEnd; ++SrcData, ++DstData) { 129 // For the in-memory destination, CounterPtr is the distance from the start 130 // address of the data to the start address of the counter. On WIN64, 131 // CounterPtr is a truncated 32-bit value due to COFF limitation. Sign 132 // extend CounterPtr to get the original value. 133 uint64_t *DstCounters = 134 (uint64_t *)((uintptr_t)DstData + signextIfWin64(DstData->CounterPtr)); 135 unsigned NVK = 0; 136 137 // SrcData is a serialized representation of the memory image. We need to 138 // compute the in-buffer counter offset from the in-memory address distance. 139 // The initial CountersDelta is the in-memory address difference 140 // start(__llvm_prf_cnts)-start(__llvm_prf_data), so SrcData->CounterPtr - 141 // CountersDelta computes the offset into the in-buffer counter section. 142 // 143 // On WIN64, CountersDelta is truncated as well, so no need for signext. 144 uint64_t *SrcCounters = 145 SrcCountersStart + 146 ((uintptr_t)SrcData->CounterPtr - CountersDelta) / sizeof(uint64_t); 147 // CountersDelta needs to be decreased as we advance to the next data 148 // record. 149 CountersDelta -= sizeof(*SrcData); 150 unsigned NC = SrcData->NumCounters; 151 if (NC == 0) 152 return 1; 153 if (SrcCounters < SrcCountersStart || 154 (const char *)SrcCounters >= SrcNameStart || 155 (const char *)(SrcCounters + NC) > SrcNameStart) 156 return 1; 157 for (unsigned I = 0; I < NC; I++) 158 DstCounters[I] += SrcCounters[I]; 159 160 /* Now merge value profile data. */ 161 if (!VPMergeHook) 162 continue; 163 164 for (unsigned I = 0; I <= IPVK_Last; I++) 165 NVK += (SrcData->NumValueSites[I] != 0); 166 167 if (!NVK) 168 continue; 169 170 if (SrcValueProfData >= ProfileData + ProfileSize) 171 return 1; 172 VPMergeHook((ValueProfData *)SrcValueProfData, DstData); 173 SrcValueProfData = 174 SrcValueProfData + ((ValueProfData *)SrcValueProfData)->TotalSize; 175 } 176 177 return 0; 178 } 179