1 /*===- InstrProfilingUtil.c - Support library for PGO instrumentation -----===*\
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 #ifdef _WIN32
11 #include <direct.h>
12 #include <process.h>
13 #include <windows.h>
14 #include "WindowsMMap.h"
15 #else
16 #include <sys/stat.h>
17 #include <sys/types.h>
18 #include <unistd.h>
19 #include <fcntl.h>
20 #include <errno.h>
21 #endif
22
23 #ifdef COMPILER_RT_HAS_UNAME
24 #include <sys/utsname.h>
25 #endif
26
27 #include <stdlib.h>
28 #include <string.h>
29
30 #if defined(__linux__)
31 #include <signal.h>
32 #include <sys/prctl.h>
33 #endif
34
35 #include "InstrProfiling.h"
36 #include "InstrProfilingUtil.h"
37
38 COMPILER_RT_WEAK unsigned lprofDirMode = 0755;
39
40 COMPILER_RT_VISIBILITY
__llvm_profile_recursive_mkdir(char * path)41 void __llvm_profile_recursive_mkdir(char *path) {
42 int i;
43
44 for (i = 1; path[i] != '\0'; ++i) {
45 char save = path[i];
46 if (!IS_DIR_SEPARATOR(path[i]))
47 continue;
48 path[i] = '\0';
49 #ifdef _WIN32
50 _mkdir(path);
51 #else
52 /* Some of these will fail, ignore it. */
53 mkdir(path, __llvm_profile_get_dir_mode());
54 #endif
55 path[i] = save;
56 }
57 }
58
59 COMPILER_RT_VISIBILITY
__llvm_profile_set_dir_mode(unsigned Mode)60 void __llvm_profile_set_dir_mode(unsigned Mode) { lprofDirMode = Mode; }
61
62 COMPILER_RT_VISIBILITY
__llvm_profile_get_dir_mode(void)63 unsigned __llvm_profile_get_dir_mode(void) { return lprofDirMode; }
64
65 #if COMPILER_RT_HAS_ATOMICS != 1
66 COMPILER_RT_VISIBILITY
lprofBoolCmpXchg(void ** Ptr,void * OldV,void * NewV)67 uint32_t lprofBoolCmpXchg(void **Ptr, void *OldV, void *NewV) {
68 void *R = *Ptr;
69 if (R == OldV) {
70 *Ptr = NewV;
71 return 1;
72 }
73 return 0;
74 }
75 COMPILER_RT_VISIBILITY
lprofPtrFetchAdd(void ** Mem,long ByteIncr)76 void *lprofPtrFetchAdd(void **Mem, long ByteIncr) {
77 void *Old = *Mem;
78 *((char **)Mem) += ByteIncr;
79 return Old;
80 }
81
82 #endif
83
84 #ifdef _MSC_VER
lprofGetHostName(char * Name,int Len)85 COMPILER_RT_VISIBILITY int lprofGetHostName(char *Name, int Len) {
86 WCHAR Buffer[COMPILER_RT_MAX_HOSTLEN];
87 DWORD BufferSize = sizeof(Buffer);
88 BOOL Result =
89 GetComputerNameExW(ComputerNameDnsFullyQualified, Buffer, &BufferSize);
90 if (!Result)
91 return -1;
92 if (WideCharToMultiByte(CP_UTF8, 0, Buffer, -1, Name, Len, NULL, NULL) == 0)
93 return -1;
94 return 0;
95 }
96 #elif defined(COMPILER_RT_HAS_UNAME)
lprofGetHostName(char * Name,int Len)97 COMPILER_RT_VISIBILITY int lprofGetHostName(char *Name, int Len) {
98 struct utsname N;
99 int R = uname(&N);
100 if (R >= 0) {
101 strncpy(Name, N.nodename, Len);
102 return 0;
103 }
104 return R;
105 }
106 #endif
107
lprofLockFd(int fd)108 COMPILER_RT_VISIBILITY int lprofLockFd(int fd) {
109 #ifdef COMPILER_RT_HAS_FCNTL_LCK
110 struct flock s_flock;
111
112 s_flock.l_whence = SEEK_SET;
113 s_flock.l_start = 0;
114 s_flock.l_len = 0; /* Until EOF. */
115 s_flock.l_pid = getpid();
116 s_flock.l_type = F_WRLCK;
117
118 while (fcntl(fd, F_SETLKW, &s_flock) == -1) {
119 if (errno != EINTR) {
120 if (errno == ENOLCK) {
121 return -1;
122 }
123 break;
124 }
125 }
126 return 0;
127 #else
128 flock(fd, LOCK_EX);
129 return 0;
130 #endif
131 }
132
lprofUnlockFd(int fd)133 COMPILER_RT_VISIBILITY int lprofUnlockFd(int fd) {
134 #ifdef COMPILER_RT_HAS_FCNTL_LCK
135 struct flock s_flock;
136
137 s_flock.l_whence = SEEK_SET;
138 s_flock.l_start = 0;
139 s_flock.l_len = 0; /* Until EOF. */
140 s_flock.l_pid = getpid();
141 s_flock.l_type = F_UNLCK;
142
143 while (fcntl(fd, F_SETLKW, &s_flock) == -1) {
144 if (errno != EINTR) {
145 if (errno == ENOLCK) {
146 return -1;
147 }
148 break;
149 }
150 }
151 return 0;
152 #else
153 flock(fd, LOCK_UN);
154 return 0;
155 #endif
156 }
157
lprofOpenFileEx(const char * ProfileName)158 COMPILER_RT_VISIBILITY FILE *lprofOpenFileEx(const char *ProfileName) {
159 FILE *f;
160 int fd;
161 #ifdef COMPILER_RT_HAS_FCNTL_LCK
162 fd = open(ProfileName, O_RDWR | O_CREAT, 0666);
163 if (fd < 0)
164 return NULL;
165
166 if (lprofLockFd(fd) != 0)
167 PROF_WARN("Data may be corrupted during profile merging : %s\n",
168 "Fail to obtain file lock due to system limit.");
169
170 f = fdopen(fd, "r+b");
171 #elif defined(_WIN32)
172 // FIXME: Use the wide variants to handle Unicode filenames.
173 HANDLE h = CreateFileA(ProfileName, GENERIC_READ | GENERIC_WRITE, 0, 0,
174 OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, 0);
175 if (h == INVALID_HANDLE_VALUE)
176 return NULL;
177
178 fd = _open_osfhandle((intptr_t)h, 0);
179 if (fd == -1) {
180 CloseHandle(h);
181 return NULL;
182 }
183
184 f = _fdopen(fd, "r+b");
185 if (f == 0) {
186 CloseHandle(h);
187 return NULL;
188 }
189 #else
190 /* Worst case no locking applied. */
191 PROF_WARN("Concurrent file access is not supported : %s\n",
192 "lack file locking");
193 fd = open(ProfileName, O_RDWR | O_CREAT, 0666);
194 if (fd < 0)
195 return NULL;
196 f = fdopen(fd, "r+b");
197 #endif
198
199 return f;
200 }
201
lprofGetPathPrefix(int * PrefixStrip,size_t * PrefixLen)202 COMPILER_RT_VISIBILITY const char *lprofGetPathPrefix(int *PrefixStrip,
203 size_t *PrefixLen) {
204 const char *Prefix = getenv("GCOV_PREFIX");
205 const char *PrefixStripStr = getenv("GCOV_PREFIX_STRIP");
206
207 *PrefixLen = 0;
208 *PrefixStrip = 0;
209 if (Prefix == NULL || Prefix[0] == '\0')
210 return NULL;
211
212 if (PrefixStripStr) {
213 *PrefixStrip = atoi(PrefixStripStr);
214
215 /* Negative GCOV_PREFIX_STRIP values are ignored */
216 if (*PrefixStrip < 0)
217 *PrefixStrip = 0;
218 } else {
219 *PrefixStrip = 0;
220 }
221 *PrefixLen = strlen(Prefix);
222
223 return Prefix;
224 }
225
226 COMPILER_RT_VISIBILITY void
lprofApplyPathPrefix(char * Dest,const char * PathStr,const char * Prefix,size_t PrefixLen,int PrefixStrip)227 lprofApplyPathPrefix(char *Dest, const char *PathStr, const char *Prefix,
228 size_t PrefixLen, int PrefixStrip) {
229
230 const char *Ptr;
231 int Level;
232 const char *StrippedPathStr = PathStr;
233
234 for (Level = 0, Ptr = PathStr + 1; Level < PrefixStrip; ++Ptr) {
235 if (*Ptr == '\0')
236 break;
237
238 if (!IS_DIR_SEPARATOR(*Ptr))
239 continue;
240
241 StrippedPathStr = Ptr;
242 ++Level;
243 }
244
245 memcpy(Dest, Prefix, PrefixLen);
246
247 if (!IS_DIR_SEPARATOR(Prefix[PrefixLen - 1]))
248 Dest[PrefixLen++] = DIR_SEPARATOR;
249
250 memcpy(Dest + PrefixLen, StrippedPathStr, strlen(StrippedPathStr) + 1);
251 }
252
253 COMPILER_RT_VISIBILITY const char *
lprofFindFirstDirSeparator(const char * Path)254 lprofFindFirstDirSeparator(const char *Path) {
255 const char *Sep = strchr(Path, DIR_SEPARATOR);
256 #if defined(DIR_SEPARATOR_2)
257 const char *Sep2 = strchr(Path, DIR_SEPARATOR_2);
258 if (Sep2 && (!Sep || Sep2 < Sep))
259 Sep = Sep2;
260 #endif
261 return Sep;
262 }
263
lprofFindLastDirSeparator(const char * Path)264 COMPILER_RT_VISIBILITY const char *lprofFindLastDirSeparator(const char *Path) {
265 const char *Sep = strrchr(Path, DIR_SEPARATOR);
266 #if defined(DIR_SEPARATOR_2)
267 const char *Sep2 = strrchr(Path, DIR_SEPARATOR_2);
268 if (Sep2 && (!Sep || Sep2 > Sep))
269 Sep = Sep2;
270 #endif
271 return Sep;
272 }
273
lprofSuspendSigKill()274 COMPILER_RT_VISIBILITY int lprofSuspendSigKill() {
275 #if defined(__linux__)
276 int PDeachSig = 0;
277 /* Temporarily suspend getting SIGKILL upon exit of the parent process. */
278 if (prctl(PR_GET_PDEATHSIG, &PDeachSig) == 0 && PDeachSig == SIGKILL)
279 prctl(PR_SET_PDEATHSIG, 0);
280 return (PDeachSig == SIGKILL);
281 #else
282 return 0;
283 #endif
284 }
285
lprofRestoreSigKill()286 COMPILER_RT_VISIBILITY void lprofRestoreSigKill() {
287 #if defined(__linux__)
288 prctl(PR_SET_PDEATHSIG, SIGKILL);
289 #endif
290 }
291