summaryrefslogtreecommitdiff
path: root/lib/IR/PassRegistry.cpp
blob: 5d2287927ca4882ce93286451925286f21c6ecb0 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
//===- PassRegistry.cpp - Pass Registration Implementation ----------------===//
//
//                     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 PassRegistry, with which passes are registered on
// initialization, and supports the PassManager in dependency resolution.
//
//===----------------------------------------------------------------------===//

#include "llvm/PassRegistry.h"
#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/SmallPtrSet.h"
#include "llvm/ADT/StringMap.h"
#include "llvm/Function.h"
#include "llvm/PassSupport.h"
#include "llvm/Support/Compiler.h"
#include "llvm/Support/ManagedStatic.h"
#include "llvm/Support/Mutex.h"
#include <vector>

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;
}

static ManagedStatic<sys::SmartMutex<true> > Lock;

//===----------------------------------------------------------------------===//
// PassRegistryImpl
//

namespace {
struct PassRegistryImpl {
  /// PassInfoMap - Keep track of the PassInfo object for each registered pass.
  typedef DenseMap<const void*, const PassInfo*> MapType;
  MapType PassInfoMap;
  
  typedef StringMap<const PassInfo*> StringMapType;
  StringMapType PassInfoStringMap;
  
  /// AnalysisGroupInfo - Keep track of information for each analysis group.
  struct AnalysisGroupInfo {
    SmallPtrSet<const PassInfo *, 8> Implementations;
  };
  DenseMap<const PassInfo*, AnalysisGroupInfo> AnalysisGroupInfoMap;
  
  std::vector<const PassInfo*> ToFree;
  std::vector<PassRegistrationListener*> Listeners;
};
} // end anonymous namespace

void *PassRegistry::getImpl() const {
  if (!pImpl)
    pImpl = new PassRegistryImpl();
  return pImpl;
}

//===----------------------------------------------------------------------===//
// Accessors
//

PassRegistry::~PassRegistry() {
  sys::SmartScopedLock<true> Guard(*Lock);
  PassRegistryImpl *Impl = static_cast<PassRegistryImpl*>(pImpl);
  
  for (std::vector<const PassInfo*>::iterator I = Impl->ToFree.begin(),
       E = Impl->ToFree.end(); I != E; ++I)
    delete *I;
  
  delete Impl;
  pImpl = 0;
}

const PassInfo *PassRegistry::getPassInfo(const void *TI) const {
  sys::SmartScopedLock<true> Guard(*Lock);
  PassRegistryImpl *Impl = static_cast<PassRegistryImpl*>(getImpl());
  PassRegistryImpl::MapType::const_iterator I = Impl->PassInfoMap.find(TI);
  return I != Impl->PassInfoMap.end() ? I->second : 0;
}

const PassInfo *PassRegistry::getPassInfo(StringRef Arg) const {
  sys::SmartScopedLock<true> Guard(*Lock);
  PassRegistryImpl *Impl = static_cast<PassRegistryImpl*>(getImpl());
  PassRegistryImpl::StringMapType::const_iterator
    I = Impl->PassInfoStringMap.find(Arg);
  return I != Impl->PassInfoStringMap.end() ? I->second : 0;
}

//===----------------------------------------------------------------------===//
// Pass Registration mechanism
//

void PassRegistry::registerPass(const PassInfo &PI, bool ShouldFree) {
  sys::SmartScopedLock<true> Guard(*Lock);
  PassRegistryImpl *Impl = static_cast<PassRegistryImpl*>(getImpl());
  bool Inserted =
    Impl->PassInfoMap.insert(std::make_pair(PI.getTypeInfo(),&PI)).second;
  assert(Inserted && "Pass registered multiple times!");
  (void)Inserted;
  Impl->PassInfoStringMap[PI.getPassArgument()] = &PI;
  
  // Notify any listeners.
  for (std::vector<PassRegistrationListener*>::iterator
       I = Impl->Listeners.begin(), E = Impl->Listeners.end(); I != E; ++I)
    (*I)->passRegistered(&PI);
  
  if (ShouldFree) Impl->ToFree.push_back(&PI);
}

void PassRegistry::unregisterPass(const PassInfo &PI) {
  sys::SmartScopedLock<true> Guard(*Lock);
  PassRegistryImpl *Impl = static_cast<PassRegistryImpl*>(getImpl());
  PassRegistryImpl::MapType::iterator I = 
    Impl->PassInfoMap.find(PI.getTypeInfo());
  assert(I != Impl->PassInfoMap.end() && "Pass registered but not in map!");
  
  // Remove pass from the map.
  Impl->PassInfoMap.erase(I);
  Impl->PassInfoStringMap.erase(PI.getPassArgument());
}

void PassRegistry::enumerateWith(PassRegistrationListener *L) {
  sys::SmartScopedLock<true> Guard(*Lock);
  PassRegistryImpl *Impl = static_cast<PassRegistryImpl*>(getImpl());
  for (PassRegistryImpl::MapType::const_iterator I = Impl->PassInfoMap.begin(),
       E = Impl->PassInfoMap.end(); I != E; ++I)
    L->passEnumerate(I->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 == 0) {
    // 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::SmartScopedLock<true> Guard(*Lock);
    
    // Make sure we keep track of the fact that the implementation implements
    // the interface.
    ImplementationInfo->addInterfaceImplemented(InterfaceInfo);

    PassRegistryImpl *Impl = static_cast<PassRegistryImpl*>(getImpl());
    PassRegistryImpl::AnalysisGroupInfo &AGI =
      Impl->AnalysisGroupInfoMap[InterfaceInfo];
    assert(AGI.Implementations.count(ImplementationInfo) == 0 &&
           "Cannot add a pass to the same analysis group more than once!");
    AGI.Implementations.insert(ImplementationInfo);
    if (isDefault) {
      assert(InterfaceInfo->getNormalCtor() == 0 &&
             "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());
    }
  }
  
  PassRegistryImpl *Impl = static_cast<PassRegistryImpl*>(getImpl());
  if (ShouldFree) Impl->ToFree.push_back(&Registeree);
}

void PassRegistry::addRegistrationListener(PassRegistrationListener *L) {
  sys::SmartScopedLock<true> Guard(*Lock);
  PassRegistryImpl *Impl = static_cast<PassRegistryImpl*>(getImpl());
  Impl->Listeners.push_back(L);
}

void PassRegistry::removeRegistrationListener(PassRegistrationListener *L) {
  sys::SmartScopedLock<true> Guard(*Lock);
  
  // NOTE: This is necessary, because removeRegistrationListener() can be called
  // as part of the llvm_shutdown sequence.  Since we have no control over the
  // order of that sequence, we need to gracefully handle the case where the
  // PassRegistry is destructed before the object that triggers this call.
  if (!pImpl) return;
  
  PassRegistryImpl *Impl = static_cast<PassRegistryImpl*>(getImpl());
  std::vector<PassRegistrationListener*>::iterator I =
    std::find(Impl->Listeners.begin(), Impl->Listeners.end(), L);
  assert(I != Impl->Listeners.end() &&
         "PassRegistrationListener not registered!");
  Impl->Listeners.erase(I);
}