1 files changed, 0 insertions, 134 deletions
diff --git a/lib/esan/working_set_posix.cpp b/lib/esan/working_set_posix.cpp
deleted file mode 100644
index 5ec53b959..000000000
--- a/lib/esan/working_set_posix.cpp
+++ /dev/null
@@ -1,134 +0,0 @@
-//===-- working_set_posix.cpp -----------------------------------*- C++ -*-===//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-//
-// This file is a part of EfficiencySanitizer, a family of performance tuners.
-//
-// POSIX-specific working set tool code.
-//===----------------------------------------------------------------------===//
-
-#include "working_set.h"
-#include "esan_flags.h"
-#include "esan_shadow.h"
-#include "sanitizer_common/sanitizer_common.h"
-#include "sanitizer_common/sanitizer_linux.h"
-#include <signal.h>
-#include <sys/mman.h>
-
-namespace __esan {
-
-// We only support regular POSIX threads with a single signal handler
-// for the whole process == thread group.
-// Thus we only need to store one app signal handler.
-// FIXME: Store and use any alternate stack and signal flags set by
-// the app.  For now we just call the app handler from our handler.
-static __sanitizer_sigaction AppSigAct;
-
-bool processWorkingSetSignal(int SigNum, void (*Handler)(int),
-                             void (**Result)(int)) {
-  VPrintf(2, "%s: %d\n", __FUNCTION__, SigNum);
-  if (SigNum == SIGSEGV) {
-    *Result = AppSigAct.handler;
-    AppSigAct.sigaction = (decltype(AppSigAct.sigaction))Handler;
-    return false; // Skip real call.
-  }
-  return true;
-}
-
-bool processWorkingSetSigaction(int SigNum, const void *ActVoid,
-                                void *OldActVoid) {
-  VPrintf(2, "%s: %d\n", __FUNCTION__, SigNum);
-  if (SigNum == SIGSEGV) {
-    const struct sigaction *Act = (const struct sigaction *) ActVoid;
-    struct sigaction *OldAct = (struct sigaction *) OldActVoid;
-    if (OldAct)
-      internal_memcpy(OldAct, &AppSigAct, sizeof(OldAct));
-    if (Act)
-      internal_memcpy(&AppSigAct, Act, sizeof(AppSigAct));
-    return false; // Skip real call.
-  }
-  return true;
-}
-
-bool processWorkingSetSigprocmask(int How, void *Set, void *OldSet) {
-  VPrintf(2, "%s\n", __FUNCTION__);
-  // All we need to do is ensure that SIGSEGV is not blocked.
-  // FIXME: we are not fully transparent as we do not pretend that
-  // SIGSEGV is still blocked on app queries: that would require
-  // per-thread mask tracking.
-  if (Set && (How == SIG_BLOCK || How == SIG_SETMASK)) {
-    if (internal_sigismember((__sanitizer_sigset_t *)Set, SIGSEGV)) {
-      VPrintf(1, "%s: removing SIGSEGV from the blocked set\n", __FUNCTION__);
-      internal_sigdelset((__sanitizer_sigset_t *)Set, SIGSEGV);
-    }
-  }
-  return true;
-}
-
-static void reinstateDefaultHandler(int SigNum) {
-  __sanitizer_sigaction SigAct;
-  internal_memset(&SigAct, 0, sizeof(SigAct));
-  SigAct.sigaction = (decltype(SigAct.sigaction))SIG_DFL;
-  int Res = internal_sigaction(SigNum, &SigAct, nullptr);
-  CHECK(Res == 0);
-  VPrintf(1, "Unregistered for %d handler\n", SigNum);
-}
-
-// If this is a shadow fault, we handle it here; otherwise, we pass it to the
-// app to handle it just as the app would do without our tool in place.
-static void handleMemoryFault(int SigNum, __sanitizer_siginfo *Info,
-                              void *Ctx) {
-  if (SigNum == SIGSEGV) {
-    // We rely on si_addr being filled in (thus we do not support old kernels).
-    siginfo_t *SigInfo = (siginfo_t *)Info;
-    uptr Addr = (uptr)SigInfo->si_addr;
-    if (isShadowMem(Addr)) {
-      VPrintf(3, "Shadow fault @%p\n", Addr);
-      uptr PageSize = GetPageSizeCached();
-      int Res = internal_mprotect((void *)RoundDownTo(Addr, PageSize),
-                                  PageSize, PROT_READ|PROT_WRITE);
-      CHECK(Res == 0);
-    } else if (AppSigAct.sigaction) {
-      // FIXME: For simplicity we ignore app options including its signal stack
-      // (we just use ours) and all the delivery flags.
-      AppSigAct.sigaction(SigNum, Info, Ctx);
-    } else {
-      // Crash instead of spinning with infinite faults.
-      reinstateDefaultHandler(SigNum);
-    }
-  } else
-    UNREACHABLE("signal not registered");
-}
-
-void registerMemoryFaultHandler() {
-  // We do not use an alternate signal stack, as doing so would require
-  // setting it up for each app thread.
-  // FIXME: This could result in problems with emulating the app's signal
-  // handling if the app relies on an alternate stack for SIGSEGV.
-
-  // We require that SIGSEGV is not blocked.  We use a sigprocmask
-  // interceptor to ensure that in the future.  Here we ensure it for
-  // the current thread.  We assume there are no other threads at this
-  // point during initialization, or that at least they do not block
-  // SIGSEGV.
-  __sanitizer_sigset_t SigSet;
-  internal_sigemptyset(&SigSet);
-  internal_sigprocmask(SIG_BLOCK, &SigSet, nullptr);
-
-  __sanitizer_sigaction SigAct;
-  internal_memset(&SigAct, 0, sizeof(SigAct));
-  SigAct.sigaction = handleMemoryFault;
-  // We want to handle nested signals b/c we need to handle a
-  // shadow fault in an app signal handler.
-  SigAct.sa_flags = SA_SIGINFO | SA_NODEFER;
-  int Res = internal_sigaction(SIGSEGV, &SigAct, &AppSigAct);
-  CHECK(Res == 0);
-  VPrintf(1, "Registered for SIGSEGV handler\n");
-}
-
-} // namespace __esan