From 22c4f493caf74c628b948dc4c689cf11184a31ce Mon Sep 17 00:00:00 2001
From: Richard Smith <richard-llvm@metafoo.co.uk>
Date: Fri, 25 Mar 2016 20:30:10 +0000
Subject: [PATCH] Remove useless and unused
 CrashRecoveryContext::getBacktrace(). This function always returned an empty
 string.

llvm-svn: 264458
---
 include/llvm/Support/CrashRecoveryContext.h | 10 +---------
 lib/Support/CrashRecoveryContext.cpp        |  8 --------
 2 files changed, 1 insertion(+), 17 deletions(-)

diff --git a/include/llvm/Support/CrashRecoveryContext.h b/include/llvm/Support/CrashRecoveryContext.h
index 1a1c7436876..485ae5f7a9d 100644
--- a/include/llvm/Support/CrashRecoveryContext.h
+++ b/include/llvm/Support/CrashRecoveryContext.h
@@ -70,8 +70,7 @@ public:
   /// \return True if the function completed successfully, and false if the
   /// function crashed (or HandleCrash was called explicitly). Clients should
   /// make as little assumptions as possible about the program state when
-  /// RunSafely has returned false. Clients can use getBacktrace() to retrieve
-  /// the backtrace of the crash on failures.
+  /// RunSafely has returned false.
   bool RunSafely(function_ref<void()> Fn);
   bool RunSafely(void (*Fn)(void*), void *UserData) {
     return RunSafely([&]() { Fn(UserData); });
@@ -94,13 +93,6 @@ public:
   /// \brief Explicitly trigger a crash recovery in the current process, and
   /// return failure from RunSafely(). This function does not return.
   void HandleCrash();
-
-  /// \brief Return a string containing the backtrace where the crash was
-  /// detected; or empty if the backtrace wasn't recovered.
-  ///
-  /// This function is only valid when a crash has been detected (i.e.,
-  /// RunSafely() has returned false.
-  const std::string &getBacktrace() const;
 };
 
 class CrashRecoveryContextCleanup {
diff --git a/lib/Support/CrashRecoveryContext.cpp b/lib/Support/CrashRecoveryContext.cpp
index 3f4ef9da48f..98865f5e065 100644
--- a/lib/Support/CrashRecoveryContext.cpp
+++ b/lib/Support/CrashRecoveryContext.cpp
@@ -31,7 +31,6 @@ struct CrashRecoveryContextImpl {
   const CrashRecoveryContextImpl *Next;
 
   CrashRecoveryContext *CRC;
-  std::string Backtrace;
   ::jmp_buf JumpBuffer;
   volatile unsigned Failed : 1;
   unsigned SwitchedThread : 1;
@@ -335,13 +334,6 @@ void CrashRecoveryContext::HandleCrash() {
   CRCI->HandleCrash();
 }
 
-const std::string &CrashRecoveryContext::getBacktrace() const {
-  CrashRecoveryContextImpl *CRC = (CrashRecoveryContextImpl *) Impl;
-  assert(CRC && "Crash recovery context never initialized!");
-  assert(CRC->Failed && "No crash was detected!");
-  return CRC->Backtrace;
-}
-
 // FIXME: Portability.
 static void setThreadBackgroundPriority() {
 #ifdef __APPLE__