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333 lines
7.9 KiB
333 lines
7.9 KiB
/*===- InstrProfilingUtil.c - Support library for PGO instrumentation -----===*\
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|*
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|* Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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|* See https://llvm.org/LICENSE.txt for license information.
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|* SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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|*
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\*===----------------------------------------------------------------------===*/
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#ifdef _WIN32
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#include <direct.h>
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#include <process.h>
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#include <windows.h>
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#include "WindowsMMap.h"
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#else
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#include <sys/file.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <errno.h>
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#endif
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#ifdef COMPILER_RT_HAS_UNAME
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#include <sys/utsname.h>
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#endif
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#include <stdlib.h>
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#include <string.h>
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#if defined(__linux__)
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#include <signal.h>
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#include <sys/prctl.h>
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#endif
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#include "InstrProfiling.h"
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#include "InstrProfilingUtil.h"
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COMPILER_RT_WEAK unsigned lprofDirMode = 0755;
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COMPILER_RT_VISIBILITY
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void __llvm_profile_recursive_mkdir(char *path) {
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int i;
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int start = 1;
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#if defined(__ANDROID__) && defined(__ANDROID_API__) && \
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defined(__ANDROID_API_FUTURE__) && \
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__ANDROID_API__ == __ANDROID_API_FUTURE__
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// Avoid spammy selinux denial messages in Android by not attempting to
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// create directories in GCOV_PREFIX. These denials occur when creating (or
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// even attempting to stat()) top-level directories like "/data".
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//
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// Do so by ignoring ${GCOV_PREFIX} when invoking mkdir().
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const char *gcov_prefix = getenv("GCOV_PREFIX");
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if (gcov_prefix != NULL) {
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const int gcov_prefix_len = strlen(gcov_prefix);
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if (strncmp(path, gcov_prefix, gcov_prefix_len) == 0)
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start = gcov_prefix_len;
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}
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#endif
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for (i = start; path[i] != '\0'; ++i) {
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char save = path[i];
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if (!IS_DIR_SEPARATOR(path[i]))
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continue;
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path[i] = '\0';
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#ifdef _WIN32
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_mkdir(path);
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#else
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/* Some of these will fail, ignore it. */
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mkdir(path, __llvm_profile_get_dir_mode());
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#endif
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path[i] = save;
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}
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}
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COMPILER_RT_VISIBILITY
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void __llvm_profile_set_dir_mode(unsigned Mode) { lprofDirMode = Mode; }
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COMPILER_RT_VISIBILITY
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unsigned __llvm_profile_get_dir_mode(void) { return lprofDirMode; }
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#if COMPILER_RT_HAS_ATOMICS != 1
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COMPILER_RT_VISIBILITY
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uint32_t lprofBoolCmpXchg(void **Ptr, void *OldV, void *NewV) {
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void *R = *Ptr;
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if (R == OldV) {
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*Ptr = NewV;
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return 1;
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}
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return 0;
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}
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COMPILER_RT_VISIBILITY
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void *lprofPtrFetchAdd(void **Mem, long ByteIncr) {
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void *Old = *Mem;
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*((char **)Mem) += ByteIncr;
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return Old;
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}
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#endif
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#ifdef _WIN32
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COMPILER_RT_VISIBILITY int lprofGetHostName(char *Name, int Len) {
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WCHAR Buffer[COMPILER_RT_MAX_HOSTLEN];
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DWORD BufferSize = sizeof(Buffer);
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BOOL Result =
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GetComputerNameExW(ComputerNameDnsFullyQualified, Buffer, &BufferSize);
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if (!Result)
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return -1;
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if (WideCharToMultiByte(CP_UTF8, 0, Buffer, -1, Name, Len, NULL, NULL) == 0)
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return -1;
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return 0;
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}
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#elif defined(COMPILER_RT_HAS_UNAME)
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COMPILER_RT_VISIBILITY int lprofGetHostName(char *Name, int Len) {
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struct utsname N;
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int R = uname(&N);
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if (R >= 0) {
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strncpy(Name, N.nodename, Len);
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return 0;
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}
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return R;
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}
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#endif
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COMPILER_RT_VISIBILITY int lprofLockFd(int fd) {
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#ifdef COMPILER_RT_HAS_FCNTL_LCK
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struct flock s_flock;
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s_flock.l_whence = SEEK_SET;
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s_flock.l_start = 0;
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s_flock.l_len = 0; /* Until EOF. */
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s_flock.l_pid = getpid();
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s_flock.l_type = F_WRLCK;
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while (fcntl(fd, F_SETLKW, &s_flock) == -1) {
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if (errno != EINTR) {
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if (errno == ENOLCK) {
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return -1;
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}
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break;
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}
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}
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return 0;
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#else
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flock(fd, LOCK_EX);
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return 0;
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#endif
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}
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COMPILER_RT_VISIBILITY int lprofUnlockFd(int fd) {
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#ifdef COMPILER_RT_HAS_FCNTL_LCK
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struct flock s_flock;
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s_flock.l_whence = SEEK_SET;
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s_flock.l_start = 0;
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s_flock.l_len = 0; /* Until EOF. */
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s_flock.l_pid = getpid();
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s_flock.l_type = F_UNLCK;
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while (fcntl(fd, F_SETLKW, &s_flock) == -1) {
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if (errno != EINTR) {
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if (errno == ENOLCK) {
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return -1;
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}
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break;
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}
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}
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return 0;
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#else
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flock(fd, LOCK_UN);
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return 0;
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#endif
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}
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COMPILER_RT_VISIBILITY int lprofLockFileHandle(FILE *F) {
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int fd;
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#if defined(_WIN32)
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fd = _fileno(F);
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#else
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fd = fileno(F);
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#endif
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return lprofLockFd(fd);
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}
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COMPILER_RT_VISIBILITY int lprofUnlockFileHandle(FILE *F) {
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int fd;
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#if defined(_WIN32)
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fd = _fileno(F);
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#else
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fd = fileno(F);
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#endif
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return lprofUnlockFd(fd);
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}
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COMPILER_RT_VISIBILITY FILE *lprofOpenFileEx(const char *ProfileName) {
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FILE *f;
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int fd;
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#ifdef COMPILER_RT_HAS_FCNTL_LCK
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fd = open(ProfileName, O_RDWR | O_CREAT, 0666);
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if (fd < 0)
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return NULL;
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if (lprofLockFd(fd) != 0)
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PROF_WARN("Data may be corrupted during profile merging : %s\n",
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"Fail to obtain file lock due to system limit.");
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f = fdopen(fd, "r+b");
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#elif defined(_WIN32)
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// FIXME: Use the wide variants to handle Unicode filenames.
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HANDLE h = CreateFileA(ProfileName, GENERIC_READ | GENERIC_WRITE,
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FILE_SHARE_READ | FILE_SHARE_WRITE, 0, OPEN_ALWAYS,
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FILE_ATTRIBUTE_NORMAL, 0);
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if (h == INVALID_HANDLE_VALUE)
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return NULL;
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fd = _open_osfhandle((intptr_t)h, 0);
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if (fd == -1) {
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CloseHandle(h);
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return NULL;
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}
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if (lprofLockFd(fd) != 0)
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PROF_WARN("Data may be corrupted during profile merging : %s\n",
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"Fail to obtain file lock due to system limit.");
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f = _fdopen(fd, "r+b");
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if (f == 0) {
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CloseHandle(h);
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return NULL;
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}
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#else
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/* Worst case no locking applied. */
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PROF_WARN("Concurrent file access is not supported : %s\n",
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"lack file locking");
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fd = open(ProfileName, O_RDWR | O_CREAT, 0666);
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if (fd < 0)
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return NULL;
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f = fdopen(fd, "r+b");
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#endif
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return f;
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}
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COMPILER_RT_VISIBILITY const char *lprofGetPathPrefix(int *PrefixStrip,
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size_t *PrefixLen) {
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const char *Prefix = getenv("GCOV_PREFIX");
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const char *PrefixStripStr = getenv("GCOV_PREFIX_STRIP");
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*PrefixLen = 0;
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*PrefixStrip = 0;
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if (Prefix == NULL || Prefix[0] == '\0')
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return NULL;
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if (PrefixStripStr) {
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*PrefixStrip = atoi(PrefixStripStr);
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/* Negative GCOV_PREFIX_STRIP values are ignored */
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if (*PrefixStrip < 0)
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*PrefixStrip = 0;
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} else {
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*PrefixStrip = 0;
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}
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*PrefixLen = strlen(Prefix);
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return Prefix;
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}
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COMPILER_RT_VISIBILITY void
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lprofApplyPathPrefix(char *Dest, const char *PathStr, const char *Prefix,
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size_t PrefixLen, int PrefixStrip) {
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const char *Ptr;
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int Level;
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const char *StrippedPathStr = PathStr;
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for (Level = 0, Ptr = PathStr + 1; Level < PrefixStrip; ++Ptr) {
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if (*Ptr == '\0')
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break;
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if (!IS_DIR_SEPARATOR(*Ptr))
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continue;
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StrippedPathStr = Ptr;
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++Level;
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}
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memcpy(Dest, Prefix, PrefixLen);
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if (!IS_DIR_SEPARATOR(Prefix[PrefixLen - 1]))
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Dest[PrefixLen++] = DIR_SEPARATOR;
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memcpy(Dest + PrefixLen, StrippedPathStr, strlen(StrippedPathStr) + 1);
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}
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COMPILER_RT_VISIBILITY const char *
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lprofFindFirstDirSeparator(const char *Path) {
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const char *Sep = strchr(Path, DIR_SEPARATOR);
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#if defined(DIR_SEPARATOR_2)
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const char *Sep2 = strchr(Path, DIR_SEPARATOR_2);
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if (Sep2 && (!Sep || Sep2 < Sep))
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Sep = Sep2;
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#endif
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return Sep;
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}
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COMPILER_RT_VISIBILITY const char *lprofFindLastDirSeparator(const char *Path) {
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const char *Sep = strrchr(Path, DIR_SEPARATOR);
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#if defined(DIR_SEPARATOR_2)
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const char *Sep2 = strrchr(Path, DIR_SEPARATOR_2);
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if (Sep2 && (!Sep || Sep2 > Sep))
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Sep = Sep2;
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#endif
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return Sep;
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}
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COMPILER_RT_VISIBILITY int lprofSuspendSigKill() {
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#if defined(__linux__)
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int PDeachSig = 0;
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/* Temporarily suspend getting SIGKILL upon exit of the parent process. */
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if (prctl(PR_GET_PDEATHSIG, &PDeachSig) == 0 && PDeachSig == SIGKILL)
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prctl(PR_SET_PDEATHSIG, 0);
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return (PDeachSig == SIGKILL);
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#else
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return 0;
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#endif
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}
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COMPILER_RT_VISIBILITY void lprofRestoreSigKill() {
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#if defined(__linux__)
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prctl(PR_SET_PDEATHSIG, SIGKILL);
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#endif
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}
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