Import LLVM, at r72732.

1 files changed, 91 insertions, 0 deletions

diff --git a/lib/Support/ManagedStatic.cpp b/lib/Support/ManagedStatic.cpp
new file mode 100644
index 0000000..6de6575
--- /dev/null
+++ b/lib/Support/ManagedStatic.cpp
@@ -0,0 +1,91 @@
+//===-- ManagedStatic.cpp - Static Global wrapper -------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements the ManagedStatic class and llvm_shutdown().
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Support/ManagedStatic.h"
+#include "llvm/Config/config.h"
+#include "llvm/System/Atomic.h"
+#include "llvm/System/Mutex.h"
+#include <cassert>
+using namespace llvm;
+
+static const ManagedStaticBase *StaticList = 0;
+
+static sys::Mutex* ManagedStaticMutex = 0;
+
+void ManagedStaticBase::RegisterManagedStatic(void *(*Creator)(),
+                                              void (*Deleter)(void*)) const {
+  if (ManagedStaticMutex) {
+    ManagedStaticMutex->acquire();
+
+    if (Ptr == 0) {
+      void* tmp = Creator ? Creator() : 0;
+
+      sys::MemoryFence();
+      Ptr = tmp;
+      DeleterFn = Deleter;
+      
+      // Add to list of managed statics.
+      Next = StaticList;
+      StaticList = this;
+    }
+
+    ManagedStaticMutex->release();
+  } else {
+    assert(Ptr == 0 && DeleterFn == 0 && Next == 0 &&
+           "Partially initialized ManagedStatic!?");
+    Ptr = Creator ? Creator() : 0;
+    DeleterFn = Deleter;
+  
+    // Add to list of managed statics.
+    Next = StaticList;
+    StaticList = this;
+  }
+}
+
+void ManagedStaticBase::destroy() const {
+  assert(DeleterFn && "ManagedStatic not initialized correctly!");
+  assert(StaticList == this &&
+         "Not destroyed in reverse order of construction?");
+  // Unlink from list.
+  StaticList = Next;
+  Next = 0;
+
+  // Destroy memory.
+  DeleterFn(Ptr);
+  
+  // Cleanup.
+  Ptr = 0;
+  DeleterFn = 0;
+}
+
+bool llvm::llvm_start_multithreaded() {
+#if LLVM_MULTITHREADED
+  assert(ManagedStaticMutex == 0 && "Multithreaded LLVM already initialized!");
+  ManagedStaticMutex = new sys::Mutex(true);
+  return true;
+#else
+  return false;
+#endif
+}
+
+/// llvm_shutdown - Deallocate and destroy all ManagedStatic variables.
+void llvm::llvm_shutdown() {
+  while (StaticList)
+    StaticList->destroy();
+
+  if (ManagedStaticMutex) {
+    delete ManagedStaticMutex;
+    ManagedStaticMutex = 0;
+  }
+}
+