1 files changed, 128 insertions, 0 deletions
diff --git a/llvm/lib/IR/PassRegistry.cpp b/llvm/lib/IR/PassRegistry.cpp
new file mode 100644
index 000000000000..92c188b11898
--- /dev/null
+++ b/llvm/lib/IR/PassRegistry.cpp
@@ -0,0 +1,128 @@
+//===- PassRegistry.cpp - Pass Registration Implementation ----------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements the PassRegistry, with which passes are registered on
+// initialization, and supports the PassManager in dependency resolution.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/PassRegistry.h"
+#include "llvm/ADT/STLExtras.h"
+#include "llvm/PassInfo.h"
+#include "llvm/PassSupport.h"
+#include "llvm/Support/ManagedStatic.h"
+#include <cassert>
+#include <memory>
+#include <utility>
+
+using namespace llvm;
+
+// FIXME: We use ManagedStatic to erase the pass registrar on shutdown.
+// Unfortunately, passes are registered with static ctors, and having
+// llvm_shutdown clear this map prevents successful resurrection after
+// llvm_shutdown is run.  Ideally we should find a solution so that we don't
+// leak the map, AND can still resurrect after shutdown.
+static ManagedStatic<PassRegistry> PassRegistryObj;
+PassRegistry *PassRegistry::getPassRegistry() {
+  return &*PassRegistryObj;
+}
+
+//===----------------------------------------------------------------------===//
+// Accessors
+//
+
+PassRegistry::~PassRegistry() = default;
+
+const PassInfo *PassRegistry::getPassInfo(const void *TI) const {
+  sys::SmartScopedReader<true> Guard(Lock);
+  MapType::const_iterator I = PassInfoMap.find(TI);
+  return I != PassInfoMap.end() ? I->second : nullptr;
+}
+
+const PassInfo *PassRegistry::getPassInfo(StringRef Arg) const {
+  sys::SmartScopedReader<true> Guard(Lock);
+  StringMapType::const_iterator I = PassInfoStringMap.find(Arg);
+  return I != PassInfoStringMap.end() ? I->second : nullptr;
+}
+
+//===----------------------------------------------------------------------===//
+// Pass Registration mechanism
+//
+
+void PassRegistry::registerPass(const PassInfo &PI, bool ShouldFree) {
+  sys::SmartScopedWriter<true> Guard(Lock);
+  bool Inserted =
+      PassInfoMap.insert(std::make_pair(PI.getTypeInfo(), &PI)).second;
+  assert(Inserted && "Pass registered multiple times!");
+  (void)Inserted;
+  PassInfoStringMap[PI.getPassArgument()] = &PI;
+
+  // Notify any listeners.
+  for (auto *Listener : Listeners)
+    Listener->passRegistered(&PI);
+
+  if (ShouldFree)
+    ToFree.push_back(std::unique_ptr<const PassInfo>(&PI));
+}
+
+void PassRegistry::enumerateWith(PassRegistrationListener *L) {
+  sys::SmartScopedReader<true> Guard(Lock);
+  for (auto PassInfoPair : PassInfoMap)
+    L->passEnumerate(PassInfoPair.second);
+}
+
+/// Analysis Group Mechanisms.
+void PassRegistry::registerAnalysisGroup(const void *InterfaceID,
+                                         const void *PassID,
+                                         PassInfo &Registeree, bool isDefault,
+                                         bool ShouldFree) {
+  PassInfo *InterfaceInfo = const_cast<PassInfo *>(getPassInfo(InterfaceID));
+  if (!InterfaceInfo) {
+    // First reference to Interface, register it now.
+    registerPass(Registeree);
+    InterfaceInfo = &Registeree;
+  }
+  assert(Registeree.isAnalysisGroup() &&
+         "Trying to join an analysis group that is a normal pass!");
+
+  if (PassID) {
+    PassInfo *ImplementationInfo = const_cast<PassInfo *>(getPassInfo(PassID));
+    assert(ImplementationInfo &&
+           "Must register pass before adding to AnalysisGroup!");
+
+    sys::SmartScopedWriter<true> Guard(Lock);
+
+    // Make sure we keep track of the fact that the implementation implements
+    // the interface.
+    ImplementationInfo->addInterfaceImplemented(InterfaceInfo);
+
+    if (isDefault) {
+      assert(InterfaceInfo->getNormalCtor() == nullptr &&
+             "Default implementation for analysis group already specified!");
+      assert(
+          ImplementationInfo->getNormalCtor() &&
+          "Cannot specify pass as default if it does not have a default ctor");
+      InterfaceInfo->setNormalCtor(ImplementationInfo->getNormalCtor());
+    }
+  }
+
+  if (ShouldFree)
+    ToFree.push_back(std::unique_ptr<const PassInfo>(&Registeree));
+}
+
+void PassRegistry::addRegistrationListener(PassRegistrationListener *L) {
+  sys::SmartScopedWriter<true> Guard(Lock);
+  Listeners.push_back(L);
+}
+
+void PassRegistry::removeRegistrationListener(PassRegistrationListener *L) {
+  sys::SmartScopedWriter<true> Guard(Lock);
+
+  auto I = llvm::find(Listeners, L);
+  Listeners.erase(I);
+}