llvm-project/compiler-rt/lib/profile/InstrProfilingBuffer.c

/*===- InstrProfilingBuffer.c - Write instrumentation to a memory buffer --===*\
|*
|*                     The LLVM Compiler Infrastructure
|*
|* This file is distributed under the University of Illinois Open Source
|* License. See LICENSE.TXT for details.
|*
\*===----------------------------------------------------------------------===*/

#include "InstrProfiling.h"
#include "InstrProfilingInternal.h"

COMPILER_RT_VISIBILITY
uint64_t __llvm_profile_get_size_for_buffer(void) {
  const __llvm_profile_data *DataBegin = __llvm_profile_begin_data();
  const __llvm_profile_data *DataEnd = __llvm_profile_end_data();
  const uint64_t *CountersBegin = __llvm_profile_begin_counters();
  const uint64_t *CountersEnd = __llvm_profile_end_counters();
  const char *NamesBegin = __llvm_profile_begin_names();
  const char *NamesEnd = __llvm_profile_end_names();

  return __llvm_profile_get_size_for_buffer_internal(
      DataBegin, DataEnd, CountersBegin, CountersEnd, NamesBegin, NamesEnd);
}

COMPILER_RT_VISIBILITY
uint64_t __llvm_profile_get_data_size(const __llvm_profile_data *Begin,
                                      const __llvm_profile_data *End) {
  intptr_t BeginI = (intptr_t)Begin, EndI = (intptr_t)End;
  return ((EndI + sizeof(__llvm_profile_data) - 1) - BeginI) /
         sizeof(__llvm_profile_data);
}

COMPILER_RT_VISIBILITY
uint64_t __llvm_profile_get_size_for_buffer_internal(
    const __llvm_profile_data *DataBegin, const __llvm_profile_data *DataEnd,
    const uint64_t *CountersBegin, const uint64_t *CountersEnd,
    const char *NamesBegin, const char *NamesEnd) {
  /* Match logic in __llvm_profile_write_buffer(). */
  const uint64_t NamesSize = (NamesEnd - NamesBegin) * sizeof(char);
  const uint8_t Padding = __llvm_profile_get_num_padding_bytes(NamesSize);
  return sizeof(__llvm_profile_header) +
         (__llvm_profile_get_data_size(DataBegin, DataEnd) *
          sizeof(__llvm_profile_data)) +
         (CountersEnd - CountersBegin) * sizeof(uint64_t) + NamesSize + Padding;
}

COMPILER_RT_VISIBILITY
void initBufferWriter(ProfDataWriter *BufferWriter, char *Buffer) {
  BufferWriter->Write = lprofBufferWriter;
  BufferWriter->WriterCtx = Buffer;
}

COMPILER_RT_VISIBILITY int __llvm_profile_write_buffer(char *Buffer) {
  ProfDataWriter BufferWriter;
  initBufferWriter(&BufferWriter, Buffer);
  return lprofWriteData(&BufferWriter, 0);
}

COMPILER_RT_VISIBILITY int __llvm_profile_write_buffer_internal(
    char *Buffer, const __llvm_profile_data *DataBegin,
    const __llvm_profile_data *DataEnd, const uint64_t *CountersBegin,
    const uint64_t *CountersEnd, const char *NamesBegin, const char *NamesEnd) {
  ProfDataWriter BufferWriter;
  initBufferWriter(&BufferWriter, Buffer);
  return lprofWriteDataImpl(&BufferWriter, DataBegin, DataEnd, CountersBegin,
                            CountersEnd, 0, NamesBegin, NamesEnd);
}