1 /*===- InstrProfilingBuffer.c - Write instrumentation to a memory buffer --===*\ 2 |* 3 |* The LLVM Compiler Infrastructure 4 |* 5 |* This file is distributed under the University of Illinois Open Source 6 |* License. See LICENSE.TXT for details. 7 |* 8 \*===----------------------------------------------------------------------===*/ 9 10 #include "InstrProfiling.h" 11 #include <string.h> 12 13 __attribute__((visibility("hidden"))) __llvm_profile_get_size_for_buffer(void)14uint64_t __llvm_profile_get_size_for_buffer(void) { 15 /* Match logic in __llvm_profile_write_buffer(). */ 16 const uint64_t NamesSize = PROFILE_RANGE_SIZE(names) * sizeof(char); 17 const uint64_t Padding = sizeof(uint64_t) - NamesSize % sizeof(uint64_t); 18 return sizeof(uint64_t) * PROFILE_HEADER_SIZE + 19 PROFILE_RANGE_SIZE(data) * sizeof(__llvm_profile_data) + 20 PROFILE_RANGE_SIZE(counters) * sizeof(uint64_t) + 21 NamesSize + Padding; 22 } 23 24 __attribute__((visibility("hidden"))) __llvm_profile_write_buffer(char * Buffer)25int __llvm_profile_write_buffer(char *Buffer) { 26 /* Match logic in __llvm_profile_get_size_for_buffer(). 27 * Match logic in __llvm_profile_write_file(). 28 */ 29 const __llvm_profile_data *DataBegin = __llvm_profile_data_begin(); 30 const __llvm_profile_data *DataEnd = __llvm_profile_data_end(); 31 const uint64_t *CountersBegin = __llvm_profile_counters_begin(); 32 const uint64_t *CountersEnd = __llvm_profile_counters_end(); 33 const char *NamesBegin = __llvm_profile_names_begin(); 34 const char *NamesEnd = __llvm_profile_names_end(); 35 36 /* Calculate size of sections. */ 37 const uint64_t DataSize = DataEnd - DataBegin; 38 const uint64_t CountersSize = CountersEnd - CountersBegin; 39 const uint64_t NamesSize = NamesEnd - NamesBegin; 40 const uint64_t Padding = sizeof(uint64_t) - NamesSize % sizeof(uint64_t); 41 42 /* Enough zeroes for padding. */ 43 const char Zeroes[sizeof(uint64_t)] = {0}; 44 45 /* Create the header. */ 46 uint64_t Header[PROFILE_HEADER_SIZE]; 47 Header[0] = __llvm_profile_get_magic(); 48 Header[1] = __llvm_profile_get_version(); 49 Header[2] = DataSize; 50 Header[3] = CountersSize; 51 Header[4] = NamesSize; 52 Header[5] = (uintptr_t)CountersBegin; 53 Header[6] = (uintptr_t)NamesBegin; 54 55 /* Write the data. */ 56 #define UPDATE_memcpy(Data, Size) \ 57 do { \ 58 memcpy(Buffer, Data, Size); \ 59 Buffer += Size; \ 60 } while (0) 61 UPDATE_memcpy(Header, PROFILE_HEADER_SIZE * sizeof(uint64_t)); 62 UPDATE_memcpy(DataBegin, DataSize * sizeof(__llvm_profile_data)); 63 UPDATE_memcpy(CountersBegin, CountersSize * sizeof(uint64_t)); 64 UPDATE_memcpy(NamesBegin, NamesSize * sizeof(char)); 65 UPDATE_memcpy(Zeroes, Padding * sizeof(char)); 66 #undef UPDATE_memcpy 67 68 return 0; 69 } 70