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 LLVM_LIBRARY_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 LLVM_LIBRARY_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 LLVM_LIBRARY_VISIBILITY int
59 __llvm_profile_write_buffer(char *Buffer) {
60   return llvmWriteProfData(bufferWriter, Buffer, 0, 0);
61 }
62 
63 LLVM_LIBRARY_VISIBILITY int __llvm_profile_write_buffer_internal(
64     char *Buffer, const __llvm_profile_data *DataBegin,
65     const __llvm_profile_data *DataEnd, const uint64_t *CountersBegin,
66     const uint64_t *CountersEnd, const char *NamesBegin, const char *NamesEnd) {
67   return llvmWriteProfDataImpl(bufferWriter, Buffer, DataBegin, DataEnd,
68                                CountersBegin, CountersEnd, 0, 0, NamesBegin,
69                                NamesEnd);
70 }
71