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")))
__llvm_profile_get_size_for_buffer(void)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 __attribute__((visibility("hidden")))
__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)31 uint64_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")))
__llvm_profile_write_buffer(char * Buffer)46 int __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")))
__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)63 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 /* 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