aboutsummaryrefslogtreecommitdiffstats
path: root/include/llvm/PassSupport.h
blob: c50c2cc184e3aebeb6eaa86ea8c2d0e90e6c518d (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
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
//===- llvm/PassSupport.h - Pass Support code -------------------*- C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines stuff that is used to define and "use" Passes.  This file
// is automatically #included by Pass.h, so:
//
//           NO .CPP FILES SHOULD INCLUDE THIS FILE DIRECTLY
//
// Instead, #include Pass.h.
//
// This file defines Pass registration code and classes used for it.
//
//===----------------------------------------------------------------------===//

#ifndef LLVM_PASS_SUPPORT_H
#define LLVM_PASS_SUPPORT_H

#include "Pass.h"
#include "llvm/PassRegistry.h"
#include "llvm/InitializePasses.h"
#include "llvm/Support/Atomic.h"
#include "llvm/Support/Valgrind.h"
#include <vector>

namespace llvm {

//===---------------------------------------------------------------------------
/// PassInfo class - An instance of this class exists for every pass known by
/// the system, and can be obtained from a live Pass by calling its
/// getPassInfo() method.  These objects are set up by the RegisterPass<>
/// template, defined below.
///
class PassInfo {
public:
  typedef Pass* (*NormalCtor_t)();

private:
  const char      *const PassName;     // Nice name for Pass
  const char      *const PassArgument; // Command Line argument to run this pass
  const void *PassID;      
  const bool IsCFGOnlyPass;            // Pass only looks at the CFG.
  const bool IsAnalysis;               // True if an analysis pass.
  const bool IsAnalysisGroup;          // True if an analysis group.
  std::vector<const PassInfo*> ItfImpl;// Interfaces implemented by this pass

  NormalCtor_t NormalCtor;

public:
  /// PassInfo ctor - Do not call this directly, this should only be invoked
  /// through RegisterPass.
  PassInfo(const char *name, const char *arg, const void *pi,
           NormalCtor_t normal, bool isCFGOnly, bool is_analysis)
    : PassName(name), PassArgument(arg), PassID(pi), 
      IsCFGOnlyPass(isCFGOnly), 
      IsAnalysis(is_analysis), IsAnalysisGroup(false), NormalCtor(normal) { }
  /// PassInfo ctor - Do not call this directly, this should only be invoked
  /// through RegisterPass. This version is for use by analysis groups; it
  /// does not auto-register the pass.
  PassInfo(const char *name, const void *pi)
    : PassName(name), PassArgument(""), PassID(pi), 
      IsCFGOnlyPass(false), 
      IsAnalysis(false), IsAnalysisGroup(true), NormalCtor(0) { }

  /// getPassName - Return the friendly name for the pass, never returns null
  ///
  const char *getPassName() const { return PassName; }

  /// getPassArgument - Return the command line option that may be passed to
  /// 'opt' that will cause this pass to be run.  This will return null if there
  /// is no argument.
  ///
  const char *getPassArgument() const { return PassArgument; }

  /// getTypeInfo - Return the id object for the pass...
  /// TODO : Rename
  const void *getTypeInfo() const { return PassID; }

  /// Return true if this PassID implements the specified ID pointer.
  bool isPassID(const void *IDPtr) const {
    return PassID == IDPtr;
  }
  
  /// isAnalysisGroup - Return true if this is an analysis group, not a normal
  /// pass.
  ///
  bool isAnalysisGroup() const { return IsAnalysisGroup; }
  bool isAnalysis() const { return IsAnalysis; }

  /// isCFGOnlyPass - return true if this pass only looks at the CFG for the
  /// function.
  bool isCFGOnlyPass() const { return IsCFGOnlyPass; }
  
  /// getNormalCtor - Return a pointer to a function, that when called, creates
  /// an instance of the pass and returns it.  This pointer may be null if there
  /// is no default constructor for the pass.
  ///
  NormalCtor_t getNormalCtor() const {
    return NormalCtor;
  }
  void setNormalCtor(NormalCtor_t Ctor) {
    NormalCtor = Ctor;
  }

  /// createPass() - Use this method to create an instance of this pass.
  Pass *createPass() const;

  /// addInterfaceImplemented - This method is called when this pass is
  /// registered as a member of an analysis group with the RegisterAnalysisGroup
  /// template.
  ///
  void addInterfaceImplemented(const PassInfo *ItfPI) {
    ItfImpl.push_back(ItfPI);
  }

  /// getInterfacesImplemented - Return a list of all of the analysis group
  /// interfaces implemented by this pass.
  ///
  const std::vector<const PassInfo*> &getInterfacesImplemented() const {
    return ItfImpl;
  }

private:
  void operator=(const PassInfo &); // do not implement
  PassInfo(const PassInfo &);       // do not implement
};

#define CALL_ONCE_INITIALIZATION(function) \
  static volatile sys::cas_flag initialized = 0; \
  sys::cas_flag old_val = sys::CompareAndSwap(&initialized, 1, 0); \
  if (old_val == 0) { \
    function(Registry); \
    sys::MemoryFence(); \
    TsanIgnoreWritesBegin(); \
    TsanHappensBefore(&initialized); \
    initialized = 2; \
    TsanIgnoreWritesEnd(); \
  } else { \
    sys::cas_flag tmp = initialized; \
    sys::MemoryFence(); \
    while (tmp != 2) { \
      tmp = initialized; \
      sys::MemoryFence(); \
    } \
  } \
  TsanHappensAfter(&initialized);

#define INITIALIZE_PASS(passName, arg, name, cfg, analysis) \
  static void* initialize##passName##PassOnce(PassRegistry &Registry) { \
    PassInfo *PI = new PassInfo(name, arg, & passName ::ID, \
      PassInfo::NormalCtor_t(callDefaultCtor< passName >), cfg, analysis); \
    Registry.registerPass(*PI, true); \
    return PI; \
  } \
  void llvm::initialize##passName##Pass(PassRegistry &Registry) { \
    CALL_ONCE_INITIALIZATION(initialize##passName##PassOnce) \
  }

#define INITIALIZE_PASS_BEGIN(passName, arg, name, cfg, analysis) \
  static void* initialize##passName##PassOnce(PassRegistry &Registry) {

#define INITIALIZE_PASS_DEPENDENCY(depName) \
    initialize##depName##Pass(Registry);
#define INITIALIZE_AG_DEPENDENCY(depName) \
    initialize##depName##AnalysisGroup(Registry);

#define INITIALIZE_PASS_END(passName, arg, name, cfg, analysis) \
    PassInfo *PI = new PassInfo(name, arg, & passName ::ID, \
      PassInfo::NormalCtor_t(callDefaultCtor< passName >), cfg, analysis); \
    Registry.registerPass(*PI, true); \
    return PI; \
  } \
  void llvm::initialize##passName##Pass(PassRegistry &Registry) { \
    CALL_ONCE_INITIALIZATION(initialize##passName##PassOnce) \
  }

template<typename PassName>
Pass *callDefaultCtor() { return new PassName(); }

//===---------------------------------------------------------------------------
/// RegisterPass<t> template - This template class is used to notify the system
/// that a Pass is available for use, and registers it into the internal
/// database maintained by the PassManager.  Unless this template is used, opt,
/// for example will not be able to see the pass and attempts to create the pass
/// will fail. This template is used in the follow manner (at global scope, in
/// your .cpp file):
///
/// static RegisterPass<YourPassClassName> tmp("passopt", "My Pass Name");
///
/// This statement will cause your pass to be created by calling the default
/// constructor exposed by the pass.  If you have a different constructor that
/// must be called, create a global constructor function (which takes the
/// arguments you need and returns a Pass*) and register your pass like this:
///
/// static RegisterPass<PassClassName> tmp("passopt", "My Name");
///
template<typename passName>
struct RegisterPass : public PassInfo {

  // Register Pass using default constructor...
  RegisterPass(const char *PassArg, const char *Name, bool CFGOnly = false,
               bool is_analysis = false)
    : PassInfo(Name, PassArg, &passName::ID,
               PassInfo::NormalCtor_t(callDefaultCtor<passName>),
               CFGOnly, is_analysis) {
    PassRegistry::getPassRegistry()->registerPass(*this);
  }
};


/// RegisterAnalysisGroup - Register a Pass as a member of an analysis _group_.
/// Analysis groups are used to define an interface (which need not derive from
/// Pass) that is required by passes to do their job.  Analysis Groups differ
/// from normal analyses because any available implementation of the group will
/// be used if it is available.
///
/// If no analysis implementing the interface is available, a default
/// implementation is created and added.  A pass registers itself as the default
/// implementation by specifying 'true' as the second template argument of this
/// class.
///
/// In addition to registering itself as an analysis group member, a pass must
/// register itself normally as well.  Passes may be members of multiple groups
/// and may still be "required" specifically by name.
///
/// The actual interface may also be registered as well (by not specifying the
/// second template argument).  The interface should be registered to associate
/// a nice name with the interface.
///
class RegisterAGBase : public PassInfo {
public:
  RegisterAGBase(const char *Name,
                 const void *InterfaceID,
                 const void *PassID = 0,
                 bool isDefault = false);
};

template<typename Interface, bool Default = false>
struct RegisterAnalysisGroup : public RegisterAGBase {
  explicit RegisterAnalysisGroup(PassInfo &RPB)
    : RegisterAGBase(RPB.getPassName(),
                     &Interface::ID, RPB.getTypeInfo(),
                     Default) {
  }

  explicit RegisterAnalysisGroup(const char *Name)
    : RegisterAGBase(Name, &Interface::ID) {
  }
};

#define INITIALIZE_ANALYSIS_GROUP(agName, name, defaultPass) \
  static void* initialize##agName##AnalysisGroupOnce(PassRegistry &Registry) { \
    initialize##defaultPass##Pass(Registry); \
    PassInfo *AI = new PassInfo(name, & agName :: ID); \
    Registry.registerAnalysisGroup(& agName ::ID, 0, *AI, false, true); \
    return AI; \
  } \
  void llvm::initialize##agName##AnalysisGroup(PassRegistry &Registry) { \
    CALL_ONCE_INITIALIZATION(initialize##agName##AnalysisGroupOnce) \
  }


#define INITIALIZE_AG_PASS(passName, agName, arg, name, cfg, analysis, def) \
  static void* initialize##passName##PassOnce(PassRegistry &Registry) { \
    if (!def) initialize##agName##AnalysisGroup(Registry); \
    PassInfo *PI = new PassInfo(name, arg, & passName ::ID, \
      PassInfo::NormalCtor_t(callDefaultCtor< passName >), cfg, analysis); \
    Registry.registerPass(*PI, true); \
    \
    PassInfo *AI = new PassInfo(name, & agName :: ID); \
    Registry.registerAnalysisGroup(& agName ::ID, & passName ::ID, \
                                   *AI, def, true); \
    return AI; \
  } \
  void llvm::initialize##passName##Pass(PassRegistry &Registry) { \
    CALL_ONCE_INITIALIZATION(initialize##passName##PassOnce) \
  }


#define INITIALIZE_AG_PASS_BEGIN(passName, agName, arg, n, cfg, analysis, def) \
  static void* initialize##passName##PassOnce(PassRegistry &Registry) { \
    if (!def) initialize##agName##AnalysisGroup(Registry);

#define INITIALIZE_AG_PASS_END(passName, agName, arg, n, cfg, analysis, def) \
    PassInfo *PI = new PassInfo(n, arg, & passName ::ID, \
      PassInfo::NormalCtor_t(callDefaultCtor< passName >), cfg, analysis); \
    Registry.registerPass(*PI, true); \
    \
    PassInfo *AI = new PassInfo(n, & agName :: ID); \
    Registry.registerAnalysisGroup(& agName ::ID, & passName ::ID, \
                                   *AI, def, true); \
    return AI; \
  } \
  void llvm::initialize##passName##Pass(PassRegistry &Registry) { \
    CALL_ONCE_INITIALIZATION(initialize##passName##PassOnce) \
  }

//===---------------------------------------------------------------------------
/// PassRegistrationListener class - This class is meant to be derived from by
/// clients that are interested in which passes get registered and unregistered
/// at runtime (which can be because of the RegisterPass constructors being run
/// as the program starts up, or may be because a shared object just got
/// loaded).  Deriving from the PassRegistationListener class automatically
/// registers your object to receive callbacks indicating when passes are loaded
/// and removed.
///
struct PassRegistrationListener {

  /// PassRegistrationListener ctor - Add the current object to the list of
  /// PassRegistrationListeners...
  PassRegistrationListener();

  /// dtor - Remove object from list of listeners...
  ///
  virtual ~PassRegistrationListener();

  /// Callback functions - These functions are invoked whenever a pass is loaded
  /// or removed from the current executable.
  ///
  virtual void passRegistered(const PassInfo *) {}

  /// enumeratePasses - Iterate over the registered passes, calling the
  /// passEnumerate callback on each PassInfo object.
  ///
  void enumeratePasses();

  /// passEnumerate - Callback function invoked when someone calls
  /// enumeratePasses on this PassRegistrationListener object.
  ///
  virtual void passEnumerate(const PassInfo *) {}
};


} // End llvm namespace

#endif