2946cd7010
to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
137 lines
3.5 KiB
C++
137 lines
3.5 KiB
C++
//===-- stats.cc ----------------------------------------------------------===//
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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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//
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// Sanitizer statistics gathering. Manages statistics for a process and is
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// responsible for writing the report file.
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//
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//===----------------------------------------------------------------------===//
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#include "sanitizer_common/sanitizer_common.h"
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#include "sanitizer_common/sanitizer_file.h"
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#include "sanitizer_common/sanitizer_internal_defs.h"
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#if SANITIZER_POSIX
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#include "sanitizer_common/sanitizer_posix.h"
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#endif
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#include "sanitizer_common/sanitizer_symbolizer.h"
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#include "stats/stats.h"
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#if SANITIZER_POSIX
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#include <signal.h>
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#endif
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using namespace __sanitizer;
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namespace {
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InternalMmapVectorNoCtor<StatModule **> modules;
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StaticSpinMutex modules_mutex;
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fd_t stats_fd;
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void WriteLE(fd_t fd, uptr val) {
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char chars[sizeof(uptr)];
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for (unsigned i = 0; i != sizeof(uptr); ++i) {
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chars[i] = val >> (i * 8);
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}
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WriteToFile(fd, chars, sizeof(uptr));
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}
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void OpenStatsFile(const char *path_env) {
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InternalMmapVector<char> path(kMaxPathLength);
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SubstituteForFlagValue(path_env, path.data(), kMaxPathLength);
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error_t err;
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stats_fd = OpenFile(path.data(), WrOnly, &err);
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if (stats_fd == kInvalidFd) {
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Report("stats: failed to open %s for writing (reason: %d)\n", path.data(),
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err);
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return;
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}
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char sizeof_uptr = sizeof(uptr);
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WriteToFile(stats_fd, &sizeof_uptr, 1);
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}
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void WriteModuleReport(StatModule **smodp) {
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CHECK(smodp);
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const char *path_env = GetEnv("SANITIZER_STATS_PATH");
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if (!path_env || stats_fd == kInvalidFd)
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return;
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if (!stats_fd)
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OpenStatsFile(path_env);
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const LoadedModule *mod = Symbolizer::GetOrInit()->FindModuleForAddress(
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reinterpret_cast<uptr>(smodp));
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WriteToFile(stats_fd, mod->full_name(),
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internal_strlen(mod->full_name()) + 1);
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for (StatModule *smod = *smodp; smod; smod = smod->next) {
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for (u32 i = 0; i != smod->size; ++i) {
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StatInfo *s = &smod->infos[i];
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if (!s->addr)
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continue;
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WriteLE(stats_fd, s->addr - mod->base_address());
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WriteLE(stats_fd, s->data);
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}
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}
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WriteLE(stats_fd, 0);
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WriteLE(stats_fd, 0);
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}
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} // namespace
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extern "C"
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SANITIZER_INTERFACE_ATTRIBUTE
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unsigned __sanitizer_stats_register(StatModule **mod) {
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SpinMutexLock l(&modules_mutex);
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modules.push_back(mod);
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return modules.size() - 1;
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}
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extern "C"
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SANITIZER_INTERFACE_ATTRIBUTE
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void __sanitizer_stats_unregister(unsigned index) {
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SpinMutexLock l(&modules_mutex);
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WriteModuleReport(modules[index]);
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modules[index] = 0;
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}
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namespace {
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void WriteFullReport() {
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SpinMutexLock l(&modules_mutex);
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for (StatModule **mod : modules) {
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if (!mod)
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continue;
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WriteModuleReport(mod);
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}
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if (stats_fd != 0 && stats_fd != kInvalidFd) {
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CloseFile(stats_fd);
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stats_fd = kInvalidFd;
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}
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}
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#if SANITIZER_POSIX
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void USR2Handler(int sig) {
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WriteFullReport();
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}
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#endif
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struct WriteReportOnExitOrSignal {
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WriteReportOnExitOrSignal() {
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#if SANITIZER_POSIX
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struct sigaction sigact;
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internal_memset(&sigact, 0, sizeof(sigact));
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sigact.sa_handler = USR2Handler;
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internal_sigaction(SIGUSR2, &sigact, nullptr);
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#endif
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}
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~WriteReportOnExitOrSignal() {
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WriteFullReport();
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}
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} wr;
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} // namespace
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