1 //===- llvm/PassSupport.h - Pass Support code -------------------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file was developed by the LLVM research group and is distributed under
6 // the University of Illinois Open Source License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file defines stuff that is used to define and "use" Passes. This file
11 // is automatically #included by Pass.h, so:
13 // NO .CPP FILES SHOULD INCLUDE THIS FILE DIRECTLY
15 // Instead, #include Pass.h.
17 // This file defines Pass registration code and classes used for it.
19 //===----------------------------------------------------------------------===//
21 #ifndef LLVM_PASS_SUPPORT_H
22 #define LLVM_PASS_SUPPORT_H
24 #include "llvm/System/IncludeFile.h"
25 // No need to include Pass.h, we are being included by it!
31 //===---------------------------------------------------------------------------
32 /// PassInfo class - An instance of this class exists for every pass known by
33 /// the system, and can be obtained from a live Pass by calling its
34 /// getPassInfo() method. These objects are set up by the RegisterPass<>
35 /// template, defined below.
38 const char *PassName; // Nice name for Pass
39 const char *PassArgument; // Command Line argument to run this pass
40 const std::type_info &TypeInfo; // type_info object for this Pass class
41 bool IsCFGOnlyPass; // Pass only looks at the CFG.
42 bool IsAnalysisGroup; // True if an analysis group.
43 std::vector<const PassInfo*> ItfImpl;// Interfaces implemented by this pass
45 Pass *(*NormalCtor)(); // No argument ctor
48 /// PassInfo ctor - Do not call this directly, this should only be invoked
49 /// through RegisterPass.
50 PassInfo(const char *name, const char *arg, const std::type_info &ti,
51 Pass *(*normal)() = 0)
52 : PassName(name), PassArgument(arg), TypeInfo(ti),
53 IsCFGOnlyPass(false), IsAnalysisGroup(false), NormalCtor(normal) {
56 /// getPassName - Return the friendly name for the pass, never returns null
58 const char *getPassName() const { return PassName; }
59 void setPassName(const char *Name) { PassName = Name; }
61 /// getPassArgument - Return the command line option that may be passed to
62 /// 'opt' that will cause this pass to be run. This will return null if there
65 const char *getPassArgument() const { return PassArgument; }
67 /// getTypeInfo - Return the type_info object for the pass...
69 const std::type_info &getTypeInfo() const { return TypeInfo; }
71 /// isAnalysisGroup - Return true if this is an analysis group, not a normal
74 bool isAnalysisGroup() const { return IsAnalysisGroup; }
75 void SetIsAnalysisGroup() { IsAnalysisGroup = true; }
77 /// isCFGOnlyPass - return true if this pass only looks at the CFG for the
79 bool isCFGOnlyPass() const { return IsCFGOnlyPass; }
80 void SetIsCFGOnlyPass() { IsCFGOnlyPass = true; }
82 /// getNormalCtor - Return a pointer to a function, that when called, creates
83 /// an instance of the pass and returns it. This pointer may be null if there
84 /// is no default constructor for the pass.
86 Pass *(*getNormalCtor() const)() {
89 void setNormalCtor(Pass *(*Ctor)()) {
93 /// createPass() - Use this method to create an instance of this pass.
94 Pass *createPass() const {
95 assert((!isAnalysisGroup() || NormalCtor) &&
96 "No default implementation found for analysis group!");
98 "Cannot call createPass on PassInfo without default ctor!");
102 /// addInterfaceImplemented - This method is called when this pass is
103 /// registered as a member of an analysis group with the RegisterAnalysisGroup
106 void addInterfaceImplemented(const PassInfo *ItfPI) {
107 ItfImpl.push_back(ItfPI);
110 /// getInterfacesImplemented - Return a list of all of the analysis group
111 /// interfaces implemented by this pass.
113 const std::vector<const PassInfo*> &getInterfacesImplemented() const {
119 //===---------------------------------------------------------------------------
120 /// RegisterPass<t> template - This template class is used to notify the system
121 /// that a Pass is available for use, and registers it into the internal
122 /// database maintained by the PassManager. Unless this template is used, opt,
123 /// for example will not be able to see the pass and attempts to create the pass
124 /// will fail. This template is used in the follow manner (at global scope, in
127 /// static RegisterPass<YourPassClassName> tmp("passopt", "My Pass Name");
129 /// This statement will cause your pass to be created by calling the default
130 /// constructor exposed by the pass. If you have a different constructor that
131 /// must be called, create a global constructor function (which takes the
132 /// arguments you need and returns a Pass*) and register your pass like this:
134 /// Pass *createMyPass(foo &opt) { return new MyPass(opt); }
135 /// static RegisterPass<PassClassName> tmp("passopt", "My Name", createMyPass);
137 struct RegisterPassBase {
138 /// getPassInfo - Get the pass info for the registered class...
140 const PassInfo *getPassInfo() const { return &PIObj; }
142 RegisterPassBase(const char *Name, const char *Arg, const std::type_info &TI,
143 Pass *(*NormalCtor)() = 0)
144 : PIObj(Name, Arg, TI, NormalCtor) {
147 RegisterPassBase(const std::type_info &TI)
148 : PIObj("", "", TI) {
149 // This ctor may only be used for analysis groups: it does not auto-register
151 PIObj.SetIsAnalysisGroup();
154 ~RegisterPassBase() { // Intentionally non-virtual.
155 // Analysis groups are registered/unregistered by their dtor.
156 if (!PIObj.isAnalysisGroup())
161 PassInfo PIObj; // The PassInfo object for this pass
163 void unregisterPass();
165 /// setOnlyUsesCFG - Notice that this pass only depends on the CFG, so
166 /// transformations that do not modify the CFG do not invalidate this pass.
168 void setOnlyUsesCFG() {
169 PIObj.SetIsCFGOnlyPass();
173 template<typename PassName>
174 Pass *callDefaultCtor() { return new PassName(); }
176 template<typename PassName>
177 struct RegisterPass : public RegisterPassBase {
179 // Register Pass using default constructor...
180 RegisterPass(const char *PassArg, const char *Name, bool CFGOnly = false)
181 : RegisterPassBase(Name, PassArg, typeid(PassName),
182 callDefaultCtor<PassName>) {
183 if (CFGOnly) setOnlyUsesCFG();
188 /// RegisterAnalysisGroup - Register a Pass as a member of an analysis _group_.
189 /// Analysis groups are used to define an interface (which need not derive from
190 /// Pass) that is required by passes to do their job. Analysis Groups differ
191 /// from normal analyses because any available implementation of the group will
192 /// be used if it is available.
194 /// If no analysis implementing the interface is available, a default
195 /// implementation is created and added. A pass registers itself as the default
196 /// implementation by specifying 'true' as the third template argument of this
199 /// In addition to registering itself as an analysis group member, a pass must
200 /// register itself normally as well. Passes may be members of multiple groups
201 /// and may still be "required" specifically by name.
203 /// The actual interface may also be registered as well (by not specifying the
204 /// second template argument). The interface should be registered to associate
205 /// a nice name with the interface.
207 class RegisterAGBase : public RegisterPassBase {
208 PassInfo *InterfaceInfo;
209 const PassInfo *ImplementationInfo;
210 bool isDefaultImplementation;
212 RegisterAGBase(const std::type_info &Interface,
213 const std::type_info *Pass = 0,
214 bool isDefault = false);
215 void setGroupName(const char *Name);
220 template<typename Interface, bool Default = false>
221 struct RegisterAnalysisGroup : public RegisterAGBase {
222 RegisterAnalysisGroup(RegisterPassBase &RPB)
223 : RegisterAGBase(typeid(Interface), &RPB.getPassInfo()->getTypeInfo(),
227 RegisterAnalysisGroup(const char *Name)
228 : RegisterAGBase(typeid(Interface)) {
235 //===---------------------------------------------------------------------------
236 /// PassRegistrationListener class - This class is meant to be derived from by
237 /// clients that are interested in which passes get registered and unregistered
238 /// at runtime (which can be because of the RegisterPass constructors being run
239 /// as the program starts up, or may be because a shared object just got
240 /// loaded). Deriving from the PassRegistationListener class automatically
241 /// registers your object to receive callbacks indicating when passes are loaded
244 struct PassRegistrationListener {
246 /// PassRegistrationListener ctor - Add the current object to the list of
247 /// PassRegistrationListeners...
248 PassRegistrationListener();
250 /// dtor - Remove object from list of listeners...
252 virtual ~PassRegistrationListener();
254 /// Callback functions - These functions are invoked whenever a pass is loaded
255 /// or removed from the current executable.
257 virtual void passRegistered(const PassInfo *P) {}
258 virtual void passUnregistered(const PassInfo *P) {}
260 /// enumeratePasses - Iterate over the registered passes, calling the
261 /// passEnumerate callback on each PassInfo object.
263 void enumeratePasses();
265 /// passEnumerate - Callback function invoked when someone calls
266 /// enumeratePasses on this PassRegistrationListener object.
268 virtual void passEnumerate(const PassInfo *P) {}
272 } // End llvm namespace