5 files changed, 33 insertions, 7 deletions

diff --git a/clang/lib/Lex/Pragma.cpp b/clang/lib/Lex/Pragma.cpp
index a8cd18b123b..57a95815488 100644
--- a/clang/lib/Lex/Pragma.cpp
+++ b/clang/lib/Lex/Pragma.cpp
@@ -42,6 +42,7 @@
 #include "llvm/ADT/StringRef.h"
 #include "llvm/Support/Compiler.h"
 #include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/Timer.h"
 #include <algorithm>
 #include <cassert>
 #include <cstddef>
@@ -1038,6 +1039,8 @@ struct PragmaDebugHandler : public PragmaHandler {
       if (!PP.getPreprocessorOpts().DisablePragmaDebugCrash)
         llvm_unreachable("This is an assertion!");
     } else if (II->isStr("crash")) {
+      llvm::Timer T("crash", "pragma crash");
+      llvm::TimeRegion R(&T);
       if (!PP.getPreprocessorOpts().DisablePragmaDebugCrash)
         LLVM_BUILTIN_TRAP;
     } else if (II->isStr("parser_crash")) {
diff --git a/clang/tools/driver/driver.cpp b/clang/tools/driver/driver.cpp
index 4457e40ff04..7b3968341cc 100644
--- a/clang/tools/driver/driver.cpp
+++ b/clang/tools/driver/driver.cpp
@@ -30,6 +30,7 @@
 #include "llvm/Option/ArgList.h"
 #include "llvm/Option/OptTable.h"
 #include "llvm/Option/Option.h"
+#include "llvm/Support/BuryPointer.h"
 #include "llvm/Support/CommandLine.h"
 #include "llvm/Support/CrashRecoveryContext.h"
 #include "llvm/Support/ErrorHandling.h"
@@ -491,6 +492,7 @@ int main(int argc_, const char **argv_) {
 
   std::unique_ptr<Compilation> C(TheDriver.BuildCompilation(argv));
   int Res = 1;
+  bool IsCrash = false;
   if (C && !C->containsError()) {
     SmallVector<std::pair<int, const Command *>, 4> FailingCommands;
     Res = TheDriver.ExecuteCompilation(*C, FailingCommands);
@@ -517,11 +519,11 @@ int main(int argc_, const char **argv_) {
       // If result status is 70, then the driver command reported a fatal error.
       // On Windows, abort will return an exit code of 3.  In these cases,
       // generate additional diagnostic information if possible.
-      bool DiagnoseCrash = CommandRes < 0 || CommandRes == 70;
+      IsCrash = CommandRes < 0 || CommandRes == 70;
 #ifdef _WIN32
-      DiagnoseCrash |= CommandRes == 3;
+      IsCrash |= CommandRes == 3;
 #endif
-      if (DiagnoseCrash) {
+      if (IsCrash) {
         TheDriver.generateCompilationDiagnostics(*C, *FailingCommand);
         break;
       }
@@ -530,10 +532,16 @@ int main(int argc_, const char **argv_) {
 
   Diags.getClient()->finish();
 
-  // If any timers were active but haven't been destroyed yet, print their
-  // results now.  This happens in -disable-free mode.
-  llvm::TimerGroup::printAll(llvm::errs());
-  llvm::TimerGroup::clearAll();
+  if (!UseNewCC1Process && IsCrash) {
+    // When crashing in -fintegrated-cc1 mode, bury the timer pointers, because
+    // the internal linked list might point to already released stack frames.
+    llvm::BuryPointer(llvm::TimerGroup::aquireDefaultGroup());
+  } else {
+    // If any timers were active but haven't been destroyed yet, print their
+    // results now.  This happens in -disable-free mode.
+    llvm::TimerGroup::printAll(llvm::errs());
+    llvm::TimerGroup::clearAll();
+  }
 
 #ifdef _WIN32
   // Exit status should not be negative on Win32, unless abnormal termination.
diff --git a/llvm/include/llvm/Support/ManagedStatic.h b/llvm/include/llvm/Support/ManagedStatic.h
index e65bb051f18..bbd0d04ed04 100644
--- a/llvm/include/llvm/Support/ManagedStatic.h
+++ b/llvm/include/llvm/Support/ManagedStatic.h
@@ -102,6 +102,12 @@ public:
   }
 
   const C *operator->() const { return &**this; }
+
+  // Extract the instance, leaving the ManagedStatic uninitialized. The
+  // user is then responsible for the lifetime of the returned instance.
+  C *claim() {
+    return static_cast<C *>(Ptr.exchange(nullptr));
+  }
 };
 
 /// llvm_shutdown - Deallocate and destroy all ManagedStatic variables.
diff --git a/llvm/include/llvm/Support/Timer.h b/llvm/include/llvm/Support/Timer.h
index a298ecd9040..045ac448bdb 100644
--- a/llvm/include/llvm/Support/Timer.h
+++ b/llvm/include/llvm/Support/Timer.h
@@ -230,6 +230,11 @@ public:
   /// used by the Statistic code to influence the construction and destruction
   /// order of the global timer lists.
   static void ConstructTimerLists();
+
+  /// This makes the default group unmanaged, and lets the user manage the
+  /// group's lifetime.
+  static std::unique_ptr<TimerGroup> aquireDefaultGroup();
+
 private:
   friend class Timer;
   friend void PrintStatisticsJSON(raw_ostream &OS);
diff --git a/llvm/lib/Support/Timer.cpp b/llvm/lib/Support/Timer.cpp
index 613d2eaae6d..2d3d0081282 100644
--- a/llvm/lib/Support/Timer.cpp
+++ b/llvm/lib/Support/Timer.cpp
@@ -441,3 +441,7 @@ const char *TimerGroup::printAllJSONValues(raw_ostream &OS, const char *delim) {
 void TimerGroup::ConstructTimerLists() {
   (void)*NamedGroupedTimers;
 }
+
+std::unique_ptr<TimerGroup> TimerGroup::aquireDefaultGroup() {
+  return std::unique_ptr<TimerGroup>(DefaultTimerGroup.claim());
+}