llvm/lib/IR/PassRegistry.cpp

   1 //===- PassRegistry.cpp - Pass Registration Implementation ----------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8 //
   9 // This file implements the PassRegistry, with which passes are registered on
  10 // initialization, and supports the PassManager in dependency resolution.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #include "llvm/PassRegistry.h"
  15 #include "llvm/ADT/STLExtras.h"
  16 #include "llvm/Pass.h"
  17 #include "llvm/PassInfo.h"
  18 #include <cassert>
  19 #include <memory>
  20 #include <utility>
  21
  22 using namespace llvm;
  23
  24 PassRegistry *PassRegistry::getPassRegistry() {
  25   static PassRegistry PassRegistryObj;
  26   return &PassRegistryObj;
  27 }
  28
  29 //===----------------------------------------------------------------------===//
  30 // Accessors
  31 //
  32
  33 PassRegistry::~PassRegistry() = default;
  34
  35 const PassInfo *PassRegistry::getPassInfo(const void *TI) const {
  36   sys::SmartScopedReader<true> Guard(Lock);
  37   return PassInfoMap.lookup(TI);
  38 }
  39
  40 const PassInfo *PassRegistry::getPassInfo(StringRef Arg) const {
  41   sys::SmartScopedReader<true> Guard(Lock);
  42   return PassInfoStringMap.lookup(Arg);
  43 }
  44
  45 //===----------------------------------------------------------------------===//
  46 // Pass Registration mechanism
  47 //
  48
  49 void PassRegistry::registerPass(const PassInfo &PI, bool ShouldFree) {
  50   sys::SmartScopedWriter<true> Guard(Lock);
  51   bool Inserted =
  52       PassInfoMap.insert(std::make_pair(PI.getTypeInfo(), &PI)).second;
  53   assert(Inserted && "Pass registered multiple times!");
  54   (void)Inserted;
  55   PassInfoStringMap[PI.getPassArgument()] = &PI;
  56
  57   // Notify any listeners.
  58   for (auto *Listener : Listeners)
  59     Listener->passRegistered(&PI);
  60
  61   if (ShouldFree)
  62     ToFree.push_back(std::unique_ptr<const PassInfo>(&PI));
  63 }
  64
  65 void PassRegistry::enumerateWith(PassRegistrationListener *L) {
  66   sys::SmartScopedReader<true> Guard(Lock);
  67   for (auto PassInfoPair : PassInfoMap)
  68     L->passEnumerate(PassInfoPair.second);
  69 }
  70
  71 void PassRegistry::addRegistrationListener(PassRegistrationListener *L) {
  72   sys::SmartScopedWriter<true> Guard(Lock);
  73   Listeners.push_back(L);
  74 }
  75
  76 void PassRegistry::removeRegistrationListener(PassRegistrationListener *L) {
  77   sys::SmartScopedWriter<true> Guard(Lock);
  78
  79   auto I = llvm::find(Listeners, L);
  80   Listeners.erase(I);
  81 }