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 IsAnalysisGroup; // True if an analysis group.
42 std::vector<const PassInfo*> ItfImpl;// Interfaces implemented by this pass
44 Pass *(*NormalCtor)(); // No argument ctor
47 /// PassInfo ctor - Do not call this directly, this should only be invoked
48 /// through RegisterPass.
49 PassInfo(const char *name, const char *arg, const std::type_info &ti,
50 Pass *(*normal)() = 0)
51 : PassName(name), PassArgument(arg), TypeInfo(ti), IsAnalysisGroup(false),
55 /// getPassName - Return the friendly name for the pass, never returns null
57 const char *getPassName() const { return PassName; }
58 void setPassName(const char *Name) { PassName = Name; }
60 /// getPassArgument - Return the command line option that may be passed to
61 /// 'opt' that will cause this pass to be run. This will return null if there
64 const char *getPassArgument() const { return PassArgument; }
66 /// getTypeInfo - Return the type_info object for the pass...
68 const std::type_info &getTypeInfo() const { return TypeInfo; }
70 /// isAnalysisGroup - Return true if this is an analysis group, not a normal
73 bool isAnalysisGroup() const { return IsAnalysisGroup; }
74 void SetIsAnalysisGroup() { IsAnalysisGroup = true; }
76 /// getNormalCtor - Return a pointer to a function, that when called, creates
77 /// an instance of the pass and returns it. This pointer may be null if there
78 /// is no default constructor for the pass.
80 Pass *(*getNormalCtor() const)() {
83 void setNormalCtor(Pass *(*Ctor)()) {
87 /// createPass() - Use this method to create an instance of this pass.
88 Pass *createPass() const {
89 assert((!isAnalysisGroup() || NormalCtor) &&
90 "No default implementation found for analysis group!");
92 "Cannot call createPass on PassInfo without default ctor!");
96 /// addInterfaceImplemented - This method is called when this pass is
97 /// registered as a member of an analysis group with the RegisterAnalysisGroup
100 void addInterfaceImplemented(const PassInfo *ItfPI) {
101 ItfImpl.push_back(ItfPI);
104 /// getInterfacesImplemented - Return a list of all of the analysis group
105 /// interfaces implemented by this pass.
107 const std::vector<const PassInfo*> &getInterfacesImplemented() const {
113 //===---------------------------------------------------------------------------
114 /// RegisterPass<t> template - This template class is used to notify the system
115 /// that a Pass is available for use, and registers it into the internal
116 /// database maintained by the PassManager. Unless this template is used, opt,
117 /// for example will not be able to see the pass and attempts to create the pass
118 /// will fail. This template is used in the follow manner (at global scope, in
121 /// static RegisterPass<YourPassClassName> tmp("passopt", "My Pass Name");
123 /// This statement will cause your pass to be created by calling the default
124 /// constructor exposed by the pass. If you have a different constructor that
125 /// must be called, create a global constructor function (which takes the
126 /// arguments you need and returns a Pass*) and register your pass like this:
128 /// Pass *createMyPass(foo &opt) { return new MyPass(opt); }
129 /// static RegisterPass<PassClassName> tmp("passopt", "My Name", createMyPass);
131 struct RegisterPassBase {
132 /// getPassInfo - Get the pass info for the registered class...
134 const PassInfo *getPassInfo() const { return &PIObj; }
136 RegisterPassBase(const char *Name, const char *Arg, const std::type_info &TI,
137 Pass *(*NormalCtor)() = 0)
138 : PIObj(Name, Arg, TI, NormalCtor) {
141 RegisterPassBase(const std::type_info &TI)
142 : PIObj("", "", TI) {
143 // This ctor may only be used for analysis groups: it does not auto-register
145 PIObj.SetIsAnalysisGroup();
148 ~RegisterPassBase() { // Intentionally non-virtual.
149 // Analysis groups are registered/unregistered by their dtor.
150 if (!PIObj.isAnalysisGroup())
155 PassInfo PIObj; // The PassInfo object for this pass
157 void unregisterPass();
159 /// setOnlyUsesCFG - Notice that this pass only depends on the CFG, so
160 /// transformations that do not modify the CFG do not invalidate this pass.
162 void setOnlyUsesCFG();
165 template<typename PassName>
166 Pass *callDefaultCtor() { return new PassName(); }
168 template<typename PassName>
169 struct RegisterPass : public RegisterPassBase {
171 // Register Pass using default constructor...
172 RegisterPass(const char *PassArg, const char *Name, bool CFGOnly = false)
173 : RegisterPassBase(Name, PassArg, typeid(PassName),
174 callDefaultCtor<PassName>) {
175 if (CFGOnly) setOnlyUsesCFG();
180 /// RegisterAnalysisGroup - Register a Pass as a member of an analysis _group_.
181 /// Analysis groups are used to define an interface (which need not derive from
182 /// Pass) that is required by passes to do their job. Analysis Groups differ
183 /// from normal analyses because any available implementation of the group will
184 /// be used if it is available.
186 /// If no analysis implementing the interface is available, a default
187 /// implementation is created and added. A pass registers itself as the default
188 /// implementation by specifying 'true' as the third template argument of this
191 /// In addition to registering itself as an analysis group member, a pass must
192 /// register itself normally as well. Passes may be members of multiple groups
193 /// and may still be "required" specifically by name.
195 /// The actual interface may also be registered as well (by not specifying the
196 /// second template argument). The interface should be registered to associate
197 /// a nice name with the interface.
199 class RegisterAGBase : public RegisterPassBase {
200 PassInfo *InterfaceInfo;
201 const PassInfo *ImplementationInfo;
202 bool isDefaultImplementation;
204 RegisterAGBase(const std::type_info &Interface,
205 const std::type_info *Pass = 0,
206 bool isDefault = false);
207 void setGroupName(const char *Name);
212 template<typename Interface, bool Default = false>
213 struct RegisterAnalysisGroup : public RegisterAGBase {
214 RegisterAnalysisGroup(RegisterPassBase &RPB)
215 : RegisterAGBase(typeid(Interface), &RPB.getPassInfo()->getTypeInfo(),
219 RegisterAnalysisGroup(const char *Name)
220 : RegisterAGBase(typeid(Interface)) {
227 //===---------------------------------------------------------------------------
228 /// PassRegistrationListener class - This class is meant to be derived from by
229 /// clients that are interested in which passes get registered and unregistered
230 /// at runtime (which can be because of the RegisterPass constructors being run
231 /// as the program starts up, or may be because a shared object just got
232 /// loaded). Deriving from the PassRegistationListener class automatically
233 /// registers your object to receive callbacks indicating when passes are loaded
236 struct PassRegistrationListener {
238 /// PassRegistrationListener ctor - Add the current object to the list of
239 /// PassRegistrationListeners...
240 PassRegistrationListener();
242 /// dtor - Remove object from list of listeners...
244 virtual ~PassRegistrationListener();
246 /// Callback functions - These functions are invoked whenever a pass is loaded
247 /// or removed from the current executable.
249 virtual void passRegistered(const PassInfo *P) {}
250 virtual void passUnregistered(const PassInfo *P) {}
252 /// enumeratePasses - Iterate over the registered passes, calling the
253 /// passEnumerate callback on each PassInfo object.
255 void enumeratePasses();
257 /// passEnumerate - Callback function invoked when someone calls
258 /// enumeratePasses on this PassRegistrationListener object.
260 virtual void passEnumerate(const PassInfo *P) {}
264 } // End llvm namespace