InstrProfilingBuffer.c revision 276851 
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__attribute__((visibility("hidden")))
16uint64_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__attribute__((visibility("hidden")))
31uint64_t __llvm_profile_get_size_for_buffer_internal(
32        const __llvm_profile_data *DataBegin,
33        const __llvm_profile_data *DataEnd, const uint64_t *CountersBegin,
34        const uint64_t *CountersEnd, const char *NamesBegin,
35        const char *NamesEnd) {
36  /* Match logic in __llvm_profile_write_buffer(). */
37  const uint64_t NamesSize = PROFILE_RANGE_SIZE(Names) * sizeof(char);
38  const uint64_t Padding = sizeof(uint64_t) - NamesSize % sizeof(uint64_t);
39  return sizeof(uint64_t) * PROFILE_HEADER_SIZE +
40      PROFILE_RANGE_SIZE(Data) * sizeof(__llvm_profile_data) +
41      PROFILE_RANGE_SIZE(Counters) * sizeof(uint64_t) +
42      NamesSize + Padding;
43}
44
45__attribute__((visibility("hidden")))
46int __llvm_profile_write_buffer(char *Buffer) {
47  /* Match logic in __llvm_profile_get_size_for_buffer().
48   * Match logic in __llvm_profile_write_file().
49   */
50  const __llvm_profile_data *DataBegin = __llvm_profile_begin_data();
51  const __llvm_profile_data *DataEnd = __llvm_profile_end_data();
52  const uint64_t *CountersBegin = __llvm_profile_begin_counters();
53  const uint64_t *CountersEnd   = __llvm_profile_end_counters();
54  const char *NamesBegin = __llvm_profile_begin_names();
55  const char *NamesEnd   = __llvm_profile_end_names();
56
57  return __llvm_profile_write_buffer_internal(Buffer, DataBegin, DataEnd,
58                                              CountersBegin, CountersEnd,
59                                              NamesBegin, NamesEnd);
60}
61
62__attribute__((visibility("hidden")))
63int __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  /* Match logic in __llvm_profile_get_size_for_buffer().
68   * Match logic in __llvm_profile_write_file().
69   */
70
71  /* Calculate size of sections. */
72  const uint64_t DataSize = DataEnd - DataBegin;
73  const uint64_t CountersSize = CountersEnd - CountersBegin;
74  const uint64_t NamesSize = NamesEnd - NamesBegin;
75  const uint64_t Padding = sizeof(uint64_t) - NamesSize % sizeof(uint64_t);
76
77  /* Enough zeroes for padding. */
78  const char Zeroes[sizeof(uint64_t)] = {0};
79
80  /* Create the header. */
81  uint64_t Header[PROFILE_HEADER_SIZE];
82  Header[0] = __llvm_profile_get_magic();
83  Header[1] = __llvm_profile_get_version();
84  Header[2] = DataSize;
85  Header[3] = CountersSize;
86  Header[4] = NamesSize;
87  Header[5] = (uintptr_t)CountersBegin;
88  Header[6] = (uintptr_t)NamesBegin;
89
90  /* Write the data. */
91#define UPDATE_memcpy(Data, Size) \
92  do {                            \
93    memcpy(Buffer, Data, Size);   \
94    Buffer += Size;               \
95  } while (0)
96  UPDATE_memcpy(Header,  PROFILE_HEADER_SIZE * sizeof(uint64_t));
97  UPDATE_memcpy(DataBegin,     DataSize      * sizeof(__llvm_profile_data));
98  UPDATE_memcpy(CountersBegin, CountersSize  * sizeof(uint64_t));
99  UPDATE_memcpy(NamesBegin,    NamesSize     * sizeof(char));
100  UPDATE_memcpy(Zeroes,        Padding       * sizeof(char));
101#undef UPDATE_memcpy
102
103  return 0;
104}
105