1 // Set these requirements to ensure that we have an 8-byte binary ID.
2 // REQUIRES: linux
3 //
4 // This will generate a 20-byte build ID, which requires 4-byte padding.
5 // RUN: %clang_profgen -Wl,--build-id=sha1 -o %t %s
6 // RUN: env LLVM_PROFILE_FILE=%t.profraw %run %t
7 // RUN: %run %t %t.profraw
8 
9 #include <errno.h>
10 #include <stdio.h>
11 #include <stdint.h>
12 #include <stdlib.h>
13 #include <string.h>
14 #include <sys/mman.h>
15 #include <sys/stat.h>
16 #include <sys/stat.h>
17 #include <fcntl.h>
18 #include <unistd.h>
19 
20 enum ValueKind {
21 #define VALUE_PROF_KIND(Enumerator, Value, Descr) Enumerator = Value,
22 #include "profile/InstrProfData.inc"
23 };
24 
25 typedef struct __llvm_profile_header {
26 #define INSTR_PROF_RAW_HEADER(Type, Name, Initializer) Type Name;
27 #include "profile/InstrProfData.inc"
28 } __llvm_profile_header;
29 
30 typedef void *IntPtrT;
31 typedef struct __llvm_profile_data {
32 #define INSTR_PROF_DATA(Type, LLVMType, Name, Initializer) Type Name;
33 #include "profile/InstrProfData.inc"
34 } __llvm_profile_data;
35 
36 void bail(const char* str) {
37   fprintf(stderr, "%s %s\n", str, strerror(errno));
38   exit(1);
39 }
40 
41 void func() {}
42 
43 int main(int argc, char** argv) {
44   if (argc == 2) {
45     int fd = open(argv[1], O_RDONLY);
46     if (fd == -1)
47       bail("open");
48 
49     struct stat st;
50     if (stat(argv[1], &st))
51       bail("stat");
52     uint64_t FileSize = st.st_size;
53 
54     char* Buf = (char *)mmap(NULL, FileSize, PROT_READ, MAP_SHARED, fd, 0);
55     if (Buf == MAP_FAILED)
56       bail("mmap");
57 
58     __llvm_profile_header *Header = (__llvm_profile_header *)Buf;
59     if (Header->BinaryIdsSize != 32)
60       bail("Invalid binary ID size");
61 
62     char *BinaryIdsStart = Buf + sizeof(__llvm_profile_header);
63 
64     uint64_t BinaryIdSize = *((uint64_t *)BinaryIdsStart);
65     if (BinaryIdSize != 20)
66       bail("Expected a binary ID of size 20");
67 
68     // Skip the size and the binary ID itself to check padding.
69     BinaryIdsStart += 8 + 20;
70     if (*((uint32_t *)BinaryIdsStart))
71       bail("Found non-zero binary ID padding");
72 
73     if (munmap(Buf, FileSize))
74       bail("munmap");
75 
76     if (close(fd))
77       bail("close");
78   } else {
79     func();
80   }
81   return 0;
82 }
83