Revert r208025, which made buildbots unhappy for unknown reasons.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@208030 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/ADT/STLExtras.h

@@ -55,131 +55,6 @@ struct greater_ptr : public std::binary_function<Ty, Ty, bool> {
   }
 };
 
-/// An efficient, type-erasing, non-owning reference to a callable. This is
-/// intended for use as the type of a function parameter that is not used
-/// after the function in question returns.
-///
-/// This class does not own the callable, so it is not in general safe to store
-/// a function_ref.
-template<typename Fn> class function_ref;
-
-#if LLVM_HAS_VARIADIC_TEMPLATES
-
-template<typename Ret, typename ...Params>
-class function_ref<Ret(Params...)> {
-  Ret (*callback)(void *callable, Params ...params);
-  void *callable;
-
-  template<typename Callable>
-  static Ret callback_fn(void *callable, Params ...params) {
-    return reinterpret_cast<Callable&>(*callable)(
-        std::forward<Params>(params)...);
-  }
-
-public:
-  template<typename Callable>
-  function_ref(Callable &&callable)
-      : callback(callback_fn<Callable>),
-        callable(reinterpret_cast<void *>(&callable)) {}
-  Ret operator()(Params ...params) const {
-    return callback(callable, std::forward<Params>(params)...);
-  }
-};
-
-#else
-
-template<typename Ret>
-class function_ref<Ret()> {
-  Ret (*callback)(void *callable);
-  void *callable;
-
-  template<typename Callable>
-  static Ret callback_fn(void *callable) {
-    return reinterpret_cast<Callable&>(*callable)();
-  }
-
-public:
-  template<typename Callable>
-  function_ref(Callable &&callable)
-      : callback(callback_fn<Callable>),
-        callable(reinterpret_cast<void *>(&callable)) {}
-  Ret operator()() const { return callback(callable); }
-};
-
-template<typename Ret, typename Param1>
-class function_ref<Ret(Param1)> {
-  Ret (*callback)(void *callable, Param1 param1);
-  void *callable;
-
-  template<typename Callable>
-  static Ret callback_fn(void *callable, Param1 param1) {
-    return reinterpret_cast<Callable&>(*callable)(
-        std::forward<Param1>(param1));
-  }
-
-public:
-  template<typename Callable>
-  function_ref(Callable &&callable)
-      : callback(callback_fn<Callable>),
-        callable(reinterpret_cast<void *>(&callable)) {}
-  Ret operator()(Param1 param1) {
-    return callback(callable, std::forward<Param1>(param1));
-  }
-};
-
-template<typename Ret, typename Param1, typename Param2>
-class function_ref<Ret(Param1, Param2)> {
-  Ret (*callback)(void *callable, Param1 param1, Param2 param2);
-  void *callable;
-
-  template<typename Callable>
-  static Ret callback_fn(void *callable, Param1 param1, Param2 param2) {
-    return reinterpret_cast<Callable&>(*callable)(
-        std::forward<Param1>(param1),
-        std::forward<Param2>(param2));
-  }
-
-public:
-  template<typename Callable>
-  function_ref(Callable &&callable)
-      : callback(callback_fn<Callable>),
-        callable(reinterpret_cast<void *>(&callable)) {}
-  Ret operator()(Param1 param1, Param2 param2) {
-    return callback(callable,
-                    std::forward<Param1>(param1),
-                    std::forward<Param2>(param2));
-  }
-};
-
-template<typename Ret, typename Param1, typename Param2, typename Param3>
-class function_ref<Ret(Param1, Param2, Param3)> {
-  Ret (*callback)(void *callable, Param1 param1, Param2 param2, Param3 param3);
-  void *callable;
-
-  template<typename Callable>
-  static Ret callback_fn(void *callable, Param1 param1, Param2 param2,
-                         Param3 param3) {
-    return reinterpret_cast<Callable&>(*callable)(
-        std::forward<Param1>(param1),
-        std::forward<Param2>(param2),
-        std::forward<Param3>(param3));
-  }
-
-public:
-  template<typename Callable>
-  function_ref(Callable &&callable)
-      : callback(callback_fn<Callable>),
-        callable(reinterpret_cast<void *>(&callable)) {}
-  Ret operator()(Param1 param1, Param2 param2, Param3 param3) {
-    return callback(callable,
-                    std::forward<Param1>(param1),
-                    std::forward<Param2>(param2),
-                    std::forward<Param3>(param3));
-  }
-};
-
-#endif
-
 // deleter - Very very very simple method that is used to invoke operator
 // delete on something.  It is used like this:
 //

include/llvm/Support/CrashRecoveryContext.h

@@ -12,13 +12,11 @@
 
 #include <string>
 
-#include "llvm/ADT/STLExtras.h"
-
 namespace llvm {
 class StringRef;
 
 class CrashRecoveryContextCleanup;
-
+  
 /// \brief Crash recovery helper object.
 ///
 /// This class implements support for running operations in a safe context so
@@ -48,10 +46,21 @@ class CrashRecoveryContext {
   void *Impl;
   CrashRecoveryContextCleanup *head;
 
+  /// An adaptor to convert an arbitrary functor into a void(void*), void* pair.
+  template<typename T> struct FunctorAdaptor {
+    T Fn;
+    static void invoke(void *Data) {
+      return static_cast<FunctorAdaptor<T>*>(Data)->Fn();
+    }
+    typedef void Callback(void*);
+    Callback *fn() { return &invoke; }
+    void *arg() { return this; }
+  };
+
 public:
   CrashRecoveryContext() : Impl(nullptr), head(nullptr) {}
   ~CrashRecoveryContext();
-
+  
   void registerCleanup(CrashRecoveryContextCleanup *cleanup);
   void unregisterCleanup(CrashRecoveryContextCleanup *cleanup);
 
@@ -77,20 +86,24 @@ class CrashRecoveryContext {
   /// 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.
-  bool RunSafely(function_ref<void()> Fn);
-  bool RunSafely(void (*Fn)(void*), void *UserData) {
-    return RunSafely([&]() { Fn(UserData); });
+  bool RunSafely(void (*Fn)(void*), void *UserData);
+  template<typename Functor>
+  bool RunSafely(Functor Fn) {
+    FunctorAdaptor<Functor> Adaptor = { Fn };
+    return RunSafely(Adaptor.fn(), Adaptor.arg());
   }
 
   /// \brief Execute the provide callback function (with the given arguments) in
   /// a protected context which is run in another thread (optionally with a
   /// requested stack size).
   ///
   /// See RunSafely() and llvm_execute_on_thread().
-  bool RunSafelyOnThread(function_ref<void()>, unsigned RequestedStackSize = 0);
   bool RunSafelyOnThread(void (*Fn)(void*), void *UserData,
-                         unsigned RequestedStackSize = 0) {
-    return RunSafelyOnThread([&]() { Fn(UserData); }, RequestedStackSize);
+                         unsigned RequestedStackSize = 0);
+  template<typename Functor>
+  bool RunSafelyOnThread(Functor Fn, unsigned RequestedStackSize = 0) {
+    FunctorAdaptor<Functor> Adaptor = { Fn };
+    return RunSafelyOnThread(Adaptor.fn(), Adaptor.arg(), RequestedStackSize);
   }
 
   /// \brief Explicitly trigger a crash recovery in the current process, and

include/llvm/Transforms/Utils/CtorUtils.h

@@ -14,18 +14,21 @@
 #ifndef LLVM_TRANSFORMS_UTILS_CTOR_UTILS_H
 #define LLVM_TRANSFORMS_UTILS_CTOR_UTILS_H
 
-#include "llvm/ADT/STLExtras.h"
+#include <functional>
+#include <vector>
 
 namespace llvm {
 
 class GlobalVariable;
 class Function;
 class Module;
 
+typedef bool (*ShouldRemoveCtor)(void *, Function *);
+
 /// Call "ShouldRemove" for every entry in M's global_ctor list and remove the
 /// entries for which it returns true.  Return true if anything changed.
-bool optimizeGlobalCtorsList(Module &M,
-                             function_ref<bool(Function *)> ShouldRemove);
+bool optimizeGlobalCtorsList(Module &M, ShouldRemoveCtor ShouldRemove,
+                             void *Context);
 
 } // End llvm namespace
 

lib/Support/CrashRecoveryContext.cpp

@@ -301,7 +301,7 @@ void CrashRecoveryContext::Disable() {
 
 #endif
 
-bool CrashRecoveryContext::RunSafely(function_ref<void()> Fn) {
+bool CrashRecoveryContext::RunSafely(void (*Fn)(void*), void *UserData) {
   // If crash recovery is disabled, do nothing.
   if (gCrashRecoveryEnabled) {
     assert(!Impl && "Crash recovery context already initialized!");
@@ -313,7 +313,7 @@ bool CrashRecoveryContext::RunSafely(function_ref<void()> Fn) {
     }
   }
 
-  Fn();
+  Fn(UserData);
   return true;
 }
 
@@ -334,7 +334,8 @@ const std::string &CrashRecoveryContext::getBacktrace() const {
 
 namespace {
 struct RunSafelyOnThreadInfo {
-  function_ref<void()> Fn;
+  void (*Fn)(void*);
+  void *Data;
   CrashRecoveryContext *CRC;
   bool Result;
 };
@@ -343,11 +344,11 @@ struct RunSafelyOnThreadInfo {
 static void RunSafelyOnThread_Dispatch(void *UserData) {
   RunSafelyOnThreadInfo *Info =
     reinterpret_cast<RunSafelyOnThreadInfo*>(UserData);
-  Info->Result = Info->CRC->RunSafely(Info->Fn);
+  Info->Result = Info->CRC->RunSafely(Info->Fn, Info->Data);
 }
-bool CrashRecoveryContext::RunSafelyOnThread(function_ref<void()> Fn,
+bool CrashRecoveryContext::RunSafelyOnThread(void (*Fn)(void*), void *UserData,
                                              unsigned RequestedStackSize) {
-  RunSafelyOnThreadInfo Info = { Fn, this, false };
+  RunSafelyOnThreadInfo Info = { Fn, UserData, this, false };
   llvm_execute_on_thread(RunSafelyOnThread_Dispatch, &Info, RequestedStackSize);
   if (CrashRecoveryContextImpl *CRC = (CrashRecoveryContextImpl *)Impl)
     CRC->setSwitchedThread();

lib/Transforms/IPO/GlobalDCE.cpp

@@ -54,16 +54,16 @@ namespace {
 
     bool RemoveUnusedGlobalValue(GlobalValue &GV);
   };
-}
 
 /// Returns true if F contains only a single "ret" instruction.
-static bool isEmptyFunction(Function *F) {
+bool isEmptyFunction(void *Context, Function *F) {
   BasicBlock &Entry = F->getEntryBlock();
   if (Entry.size() != 1 || !isa<ReturnInst>(Entry.front()))
     return false;
   ReturnInst &RI = cast<ReturnInst>(Entry.front());
   return RI.getReturnValue() == NULL;
 }
+}
 
 char GlobalDCE::ID = 0;
 INITIALIZE_PASS(GlobalDCE, "globaldce",
@@ -75,7 +75,7 @@ bool GlobalDCE::runOnModule(Module &M) {
   bool Changed = false;
 
   // Remove empty functions from the global ctors list.
-  Changed |= optimizeGlobalCtorsList(M, isEmptyFunction);
+  Changed |= optimizeGlobalCtorsList(M, isEmptyFunction, nullptr);
 
   // Loop over the module, adding globals which are obviously necessary.
   for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I) {

lib/Transforms/IPO/GlobalOpt.cpp

@@ -3022,9 +3022,10 @@ bool GlobalOpt::runOnModule(Module &M) {
     LocalChange |= OptimizeFunctions(M);
 
     // Optimize global_ctors list.
-    LocalChange |= optimizeGlobalCtorsList(M, [&](Function *F) {
-      return EvaluateStaticConstructor(F, DL, TLI);
-    });
+    LocalChange |= optimizeGlobalCtorsList(M, [](void *C, Function *F) -> bool {
+      GlobalOpt *self = static_cast<GlobalOpt *>(C);
+      return EvaluateStaticConstructor(F, self->DL, self->TLI);
+    }, this);
 
     // Optimize non-address-taken globals.
     LocalChange |= OptimizeGlobalVars(M);

lib/Transforms/Utils/CtorUtils.cpp

@@ -132,8 +132,8 @@ GlobalVariable *findGlobalCtors(Module &M) {
 
 /// Call "ShouldRemove" for every entry in M's global_ctor list and remove the
 /// entries for which it returns true.  Return true if anything changed.
-bool optimizeGlobalCtorsList(Module &M,
-                             function_ref<bool(Function *)> ShouldRemove) {
+bool optimizeGlobalCtorsList(Module &M, ShouldRemoveCtor ShouldRemove,
+                             void *Context) {
   GlobalVariable *GlobalCtors = findGlobalCtors(M);
   if (!GlobalCtors)
     return false;
@@ -163,7 +163,7 @@ bool optimizeGlobalCtorsList(Module &M,
       continue;
 
     // If we can evaluate the ctor at compile time, do.
-    if (ShouldRemove(F)) {
+    if (ShouldRemove(Context, F)) {
       Ctors.erase(Ctors.begin() + i);
       MadeChange = true;
       --i;