1 //===- llvm/PassSupport.h - Pass Support code -------------------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // 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 // No need to include Pass.h, we are being included by it!
30 //===---------------------------------------------------------------------------
31 /// PassInfo class - An instance of this class exists for every pass known by
32 /// the system, and can be obtained from a live Pass by calling its
33 /// getPassInfo() method. These objects are set up by the RegisterPass<>
34 /// template, defined below.
38 typedef Pass* (*NormalCtor_t)();
41 const char *const PassName; // Nice name for Pass
42 const char *const PassArgument; // Command Line argument to run this pass
43 const intptr_t PassID;
44 const bool IsCFGOnlyPass; // Pass only looks at the CFG.
45 const bool IsAnalysis; // True if an analysis pass.
46 const bool IsAnalysisGroup; // True if an analysis group.
47 std::vector<const PassInfo*> ItfImpl;// Interfaces implemented by this pass
49 NormalCtor_t NormalCtor;
52 /// PassInfo ctor - Do not call this directly, this should only be invoked
53 /// through RegisterPass.
54 PassInfo(const char *name, const char *arg, intptr_t pi,
55 NormalCtor_t normal = 0,
56 bool isCFGOnly = false, bool is_analysis = false)
57 : PassName(name), PassArgument(arg), PassID(pi),
58 IsCFGOnlyPass(isCFGOnly),
59 IsAnalysis(is_analysis), IsAnalysisGroup(false), NormalCtor(normal) {
62 /// PassInfo ctor - Do not call this directly, this should only be invoked
63 /// through RegisterPass. This version is for use by analysis groups; it
64 /// does not auto-register the pass.
65 PassInfo(const char *name, intptr_t pi)
66 : PassName(name), PassArgument(""), PassID(pi),
68 IsAnalysis(false), IsAnalysisGroup(true), NormalCtor(0) {
71 /// getPassName - Return the friendly name for the pass, never returns null
73 const char *getPassName() const { return PassName; }
75 /// getPassArgument - Return the command line option that may be passed to
76 /// 'opt' that will cause this pass to be run. This will return null if there
79 const char *getPassArgument() const { return PassArgument; }
81 /// getTypeInfo - Return the id object for the pass...
83 intptr_t getTypeInfo() const { return PassID; }
85 /// isAnalysisGroup - Return true if this is an analysis group, not a normal
88 bool isAnalysisGroup() const { return IsAnalysisGroup; }
89 bool isAnalysis() const { return IsAnalysis; }
91 /// isCFGOnlyPass - return true if this pass only looks at the CFG for the
93 bool isCFGOnlyPass() const { return IsCFGOnlyPass; }
95 /// getNormalCtor - Return a pointer to a function, that when called, creates
96 /// an instance of the pass and returns it. This pointer may be null if there
97 /// is no default constructor for the pass.
99 NormalCtor_t getNormalCtor() const {
102 void setNormalCtor(NormalCtor_t Ctor) {
106 /// createPass() - Use this method to create an instance of this pass.
107 Pass *createPass() const {
108 assert((!isAnalysisGroup() || NormalCtor) &&
109 "No default implementation found for analysis group!");
111 "Cannot call createPass on PassInfo without default ctor!");
115 /// addInterfaceImplemented - This method is called when this pass is
116 /// registered as a member of an analysis group with the RegisterAnalysisGroup
119 void addInterfaceImplemented(const PassInfo *ItfPI) {
120 ItfImpl.push_back(ItfPI);
123 /// getInterfacesImplemented - Return a list of all of the analysis group
124 /// interfaces implemented by this pass.
126 const std::vector<const PassInfo*> &getInterfacesImplemented() const {
132 void unregisterPass();
135 void operator=(const PassInfo &); // do not implement
136 PassInfo(const PassInfo &); // do not implement
140 template<typename PassName>
141 Pass *callDefaultCtor() { return new PassName(); }
143 //===---------------------------------------------------------------------------
144 /// RegisterPass<t> template - This template class is used to notify the system
145 /// that a Pass is available for use, and registers it into the internal
146 /// database maintained by the PassManager. Unless this template is used, opt,
147 /// for example will not be able to see the pass and attempts to create the pass
148 /// will fail. This template is used in the follow manner (at global scope, in
151 /// static RegisterPass<YourPassClassName> tmp("passopt", "My Pass Name");
153 /// This statement will cause your pass to be created by calling the default
154 /// constructor exposed by the pass. If you have a different constructor that
155 /// must be called, create a global constructor function (which takes the
156 /// arguments you need and returns a Pass*) and register your pass like this:
158 /// static RegisterPass<PassClassName> tmp("passopt", "My Name");
160 template<typename passName>
161 struct RegisterPass : public PassInfo {
163 // Register Pass using default constructor...
164 RegisterPass(const char *PassArg, const char *Name, bool CFGOnly = false,
165 bool is_analysis = false)
166 : PassInfo(Name, PassArg, intptr_t(&passName::ID),
167 PassInfo::NormalCtor_t(callDefaultCtor<passName>),
168 CFGOnly, is_analysis) {
173 /// RegisterAnalysisGroup - Register a Pass as a member of an analysis _group_.
174 /// Analysis groups are used to define an interface (which need not derive from
175 /// Pass) that is required by passes to do their job. Analysis Groups differ
176 /// from normal analyses because any available implementation of the group will
177 /// be used if it is available.
179 /// If no analysis implementing the interface is available, a default
180 /// implementation is created and added. A pass registers itself as the default
181 /// implementation by specifying 'true' as the second template argument of this
184 /// In addition to registering itself as an analysis group member, a pass must
185 /// register itself normally as well. Passes may be members of multiple groups
186 /// and may still be "required" specifically by name.
188 /// The actual interface may also be registered as well (by not specifying the
189 /// second template argument). The interface should be registered to associate
190 /// a nice name with the interface.
192 class RegisterAGBase : public PassInfo {
193 PassInfo *InterfaceInfo;
194 const PassInfo *ImplementationInfo;
195 bool isDefaultImplementation;
197 explicit RegisterAGBase(const char *Name,
198 intptr_t InterfaceID,
200 bool isDefault = false);
203 template<typename Interface, bool Default = false>
204 struct RegisterAnalysisGroup : public RegisterAGBase {
205 explicit RegisterAnalysisGroup(PassInfo &RPB)
206 : RegisterAGBase(RPB.getPassName(),
207 intptr_t(&Interface::ID), RPB.getTypeInfo(),
211 explicit RegisterAnalysisGroup(const char *Name)
212 : RegisterAGBase(Name, intptr_t(&Interface::ID)) {
218 //===---------------------------------------------------------------------------
219 /// PassRegistrationListener class - This class is meant to be derived from by
220 /// clients that are interested in which passes get registered and unregistered
221 /// at runtime (which can be because of the RegisterPass constructors being run
222 /// as the program starts up, or may be because a shared object just got
223 /// loaded). Deriving from the PassRegistationListener class automatically
224 /// registers your object to receive callbacks indicating when passes are loaded
227 struct PassRegistrationListener {
229 /// PassRegistrationListener ctor - Add the current object to the list of
230 /// PassRegistrationListeners...
231 PassRegistrationListener();
233 /// dtor - Remove object from list of listeners...
235 virtual ~PassRegistrationListener();
237 /// Callback functions - These functions are invoked whenever a pass is loaded
238 /// or removed from the current executable.
240 virtual void passRegistered(const PassInfo *) {}
242 /// enumeratePasses - Iterate over the registered passes, calling the
243 /// passEnumerate callback on each PassInfo object.
245 void enumeratePasses();
247 /// passEnumerate - Callback function invoked when someone calls
248 /// enumeratePasses on this PassRegistrationListener object.
250 virtual void passEnumerate(const PassInfo *) {}
254 } // End llvm namespace