summaryrefslogtreecommitdiff
path: root/lib/IR/Pass.cpp
blob: 3782e2d7be5d280ed1dbd1702f3657de8fd09fb2 (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
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
//===- Pass.cpp - LLVM Pass Infrastructure 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 LLVM Pass infrastructure.  It is primarily
// responsible with ensuring that passes are executed and batched together
// optimally.
//
//===----------------------------------------------------------------------===//

#include "llvm/Pass.h"
#include "llvm/IR/IRPrintingPasses.h"
#include "llvm/PassRegistry.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/PassNameParser.h"
#include "llvm/Support/raw_ostream.h"
using namespace llvm;

//===----------------------------------------------------------------------===//
// Pass Implementation
//

// Force out-of-line virtual method.
Pass::~Pass() {
  delete Resolver;
}

// Force out-of-line virtual method.
ModulePass::~ModulePass() { }

Pass *ModulePass::createPrinterPass(raw_ostream &O,
                                    const std::string &Banner) const {
  return createPrintModulePass(O, Banner);
}

PassManagerType ModulePass::getPotentialPassManagerType() const {
  return PMT_ModulePassManager;
}

bool Pass::mustPreserveAnalysisID(char &AID) const {
  return Resolver->getAnalysisIfAvailable(&AID, true) != 0;
}

// dumpPassStructure - Implement the -debug-pass=Structure option
void Pass::dumpPassStructure(unsigned Offset) {
  dbgs().indent(Offset*2) << getPassName() << "\n";
}

/// getPassName - Return a nice clean name for a pass.  This usually
/// implemented in terms of the name that is registered by one of the
/// Registration templates, but can be overloaded directly.
///
const char *Pass::getPassName() const {
  AnalysisID AID =  getPassID();
  const PassInfo *PI = PassRegistry::getPassRegistry()->getPassInfo(AID);
  if (PI)
    return PI->getPassName();
  return "Unnamed pass: implement Pass::getPassName()";
}

void Pass::preparePassManager(PMStack &) {
  // By default, don't do anything.
}

PassManagerType Pass::getPotentialPassManagerType() const {
  // Default implementation.
  return PMT_Unknown;
}

void Pass::getAnalysisUsage(AnalysisUsage &) const {
  // By default, no analysis results are used, all are invalidated.
}

void Pass::releaseMemory() {
  // By default, don't do anything.
}

void Pass::verifyAnalysis() const {
  // By default, don't do anything.
}

void *Pass::getAdjustedAnalysisPointer(AnalysisID AID) {
  return this;
}

ImmutablePass *Pass::getAsImmutablePass() {
  return 0;
}

PMDataManager *Pass::getAsPMDataManager() {
  return 0;
}

void Pass::setResolver(AnalysisResolver *AR) {
  assert(!Resolver && "Resolver is already set");
  Resolver = AR;
}

// print - Print out the internal state of the pass.  This is called by Analyze
// to print out the contents of an analysis.  Otherwise it is not necessary to
// implement this method.
//
void Pass::print(raw_ostream &O,const Module*) const {
  O << "Pass::print not implemented for pass: '" << getPassName() << "'!\n";
}

// dump - call print(cerr);
void Pass::dump() const {
  print(dbgs(), 0);
}

//===----------------------------------------------------------------------===//
// ImmutablePass Implementation
//
// Force out-of-line virtual method.
ImmutablePass::~ImmutablePass() { }

void ImmutablePass::initializePass() {
  // By default, don't do anything.
}

//===----------------------------------------------------------------------===//
// FunctionPass Implementation
//

Pass *FunctionPass::createPrinterPass(raw_ostream &O,
                                      const std::string &Banner) const {
  return createPrintFunctionPass(O, Banner);
}

PassManagerType FunctionPass::getPotentialPassManagerType() const {
  return PMT_FunctionPassManager;
}

//===----------------------------------------------------------------------===//
// BasicBlockPass Implementation
//

Pass *BasicBlockPass::createPrinterPass(raw_ostream &O,
                                        const std::string &Banner) const {
  return createPrintBasicBlockPass(O, Banner);
}

bool BasicBlockPass::doInitialization(Function &) {
  // By default, don't do anything.
  return false;
}

bool BasicBlockPass::doFinalization(Function &) {
  // By default, don't do anything.
  return false;
}

PassManagerType BasicBlockPass::getPotentialPassManagerType() const {
  return PMT_BasicBlockPassManager;
}

const PassInfo *Pass::lookupPassInfo(const void *TI) {
  return PassRegistry::getPassRegistry()->getPassInfo(TI);
}

const PassInfo *Pass::lookupPassInfo(StringRef Arg) {
  return PassRegistry::getPassRegistry()->getPassInfo(Arg);
}

Pass *Pass::createPass(AnalysisID ID) {
  const PassInfo *PI = PassRegistry::getPassRegistry()->getPassInfo(ID);
  if (!PI)
    return NULL;
  return PI->createPass();
}

Pass *PassInfo::createPass() const {
  assert((!isAnalysisGroup() || NormalCtor) &&
         "No default implementation found for analysis group!");
  assert(NormalCtor &&
         "Cannot call createPass on PassInfo without default ctor!");
  return NormalCtor();
}

//===----------------------------------------------------------------------===//
//                  Analysis Group Implementation Code
//===----------------------------------------------------------------------===//

// RegisterAGBase implementation
//
RegisterAGBase::RegisterAGBase(const char *Name, const void *InterfaceID,
                               const void *PassID, bool isDefault)
    : PassInfo(Name, InterfaceID) {
  PassRegistry::getPassRegistry()->registerAnalysisGroup(InterfaceID, PassID,
                                                         *this, isDefault);
}

//===----------------------------------------------------------------------===//
// PassRegistrationListener implementation
//

// PassRegistrationListener ctor - Add the current object to the list of
// PassRegistrationListeners...
PassRegistrationListener::PassRegistrationListener() {
  PassRegistry::getPassRegistry()->addRegistrationListener(this);
}

// dtor - Remove object from list of listeners...
PassRegistrationListener::~PassRegistrationListener() {
  PassRegistry::getPassRegistry()->removeRegistrationListener(this);
}

// enumeratePasses - Iterate over the registered passes, calling the
// passEnumerate callback on each PassInfo object.
//
void PassRegistrationListener::enumeratePasses() {
  PassRegistry::getPassRegistry()->enumerateWith(this);
}

PassNameParser::~PassNameParser() {}

//===----------------------------------------------------------------------===//
//   AnalysisUsage Class Implementation
//

namespace {
  struct GetCFGOnlyPasses : public PassRegistrationListener {
    typedef AnalysisUsage::VectorType VectorType;
    VectorType &CFGOnlyList;
    GetCFGOnlyPasses(VectorType &L) : CFGOnlyList(L) {}

    void passEnumerate(const PassInfo *P) {
      if (P->isCFGOnlyPass())
        CFGOnlyList.push_back(P->getTypeInfo());
    }
  };
}

// setPreservesCFG - This function should be called to by the pass, iff they do
// not:
//
//  1. Add or remove basic blocks from the function
//  2. Modify terminator instructions in any way.
//
// This function annotates the AnalysisUsage info object to say that analyses
// that only depend on the CFG are preserved by this pass.
//
void AnalysisUsage::setPreservesCFG() {
  // Since this transformation doesn't modify the CFG, it preserves all analyses
  // that only depend on the CFG (like dominators, loop info, etc...)
  GetCFGOnlyPasses(Preserved).enumeratePasses();
}

AnalysisUsage &AnalysisUsage::addPreserved(StringRef Arg) {
  const PassInfo *PI = Pass::lookupPassInfo(Arg);
  // If the pass exists, preserve it. Otherwise silently do nothing.
  if (PI) Preserved.push_back(PI->getTypeInfo());
  return *this;
}

AnalysisUsage &AnalysisUsage::addRequiredID(const void *ID) {
  Required.push_back(ID);
  return *this;
}

AnalysisUsage &AnalysisUsage::addRequiredID(char &ID) {
  Required.push_back(&ID);
  return *this;
}

AnalysisUsage &AnalysisUsage::addRequiredTransitiveID(char &ID) {
  Required.push_back(&ID);
  RequiredTransitive.push_back(&ID);
  return *this;
}