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      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 "InstrProfilingInternal.h"
     12 
     13 #include <string.h>
     14 
     15 COMPILER_RT_VISIBILITY
     16 uint64_t __llvm_profile_get_size_for_buffer(void) {
     17   const __llvm_profile_data *DataBegin = __llvm_profile_begin_data();
     18   const __llvm_profile_data *DataEnd = __llvm_profile_end_data();
     19   const uint64_t *CountersBegin = __llvm_profile_begin_counters();
     20   const uint64_t *CountersEnd = __llvm_profile_end_counters();
     21   const char *NamesBegin = __llvm_profile_begin_names();
     22   const char *NamesEnd = __llvm_profile_end_names();
     23 
     24   return __llvm_profile_get_size_for_buffer_internal(
     25       DataBegin, DataEnd, CountersBegin, CountersEnd, NamesBegin, NamesEnd);
     26 }
     27 
     28 #define PROFILE_RANGE_SIZE(Range) (Range##End - Range##Begin)
     29 
     30 COMPILER_RT_VISIBILITY
     31 uint64_t __llvm_profile_get_size_for_buffer_internal(
     32     const __llvm_profile_data *DataBegin, const __llvm_profile_data *DataEnd,
     33     const uint64_t *CountersBegin, const uint64_t *CountersEnd,
     34     const char *NamesBegin, const char *NamesEnd) {
     35   /* Match logic in __llvm_profile_write_buffer(). */
     36   const uint64_t NamesSize = PROFILE_RANGE_SIZE(Names) * sizeof(char);
     37   const uint8_t Padding = __llvm_profile_get_num_padding_bytes(NamesSize);
     38   return sizeof(__llvm_profile_header) +
     39          PROFILE_RANGE_SIZE(Data) * sizeof(__llvm_profile_data) +
     40          PROFILE_RANGE_SIZE(Counters) * sizeof(uint64_t) + NamesSize + Padding;
     41 }
     42 
     43 /* The buffer writer is reponsponsible in keeping writer state
     44  * across the call.
     45  */
     46 static uint32_t bufferWriter(ProfDataIOVec *IOVecs, uint32_t NumIOVecs,
     47                              void **WriterCtx) {
     48   uint32_t I;
     49   char **Buffer = (char **)WriterCtx;
     50   for (I = 0; I < NumIOVecs; I++) {
     51     size_t Length = IOVecs[I].ElmSize * IOVecs[I].NumElm;
     52     memcpy(*Buffer, IOVecs[I].Data, Length);
     53     *Buffer += Length;
     54   }
     55   return 0;
     56 }
     57 
     58 COMPILER_RT_VISIBILITY int __llvm_profile_write_buffer(char *Buffer) {
     59   return llvmWriteProfData(bufferWriter, Buffer, 0, 0);
     60 }
     61 
     62 COMPILER_RT_VISIBILITY int __llvm_profile_write_buffer_internal(
     63     char *Buffer, const __llvm_profile_data *DataBegin,
     64     const __llvm_profile_data *DataEnd, const uint64_t *CountersBegin,
     65     const uint64_t *CountersEnd, const char *NamesBegin, const char *NamesEnd) {
     66   return llvmWriteProfDataImpl(bufferWriter, Buffer, DataBegin, DataEnd,
     67                                CountersBegin, CountersEnd, 0, 0, NamesBegin,
     68                                NamesEnd);
     69 }
     70