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
25 #include "llvm/PassRegistry.h"
26 #include "llvm/InitializePasses.h"
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.
39 typedef Pass* (*NormalCtor_t)();
42 const char *const PassName; // Nice name for Pass
43 const char *const PassArgument; // Command Line argument to run this pass
45 const bool IsCFGOnlyPass; // Pass only looks at the CFG.
46 const bool IsAnalysis; // True if an analysis pass.
47 const bool IsAnalysisGroup; // True if an analysis group.
48 std::vector<const PassInfo*> ItfImpl;// Interfaces implemented by this pass
50 NormalCtor_t NormalCtor;
53 /// PassInfo ctor - Do not call this directly, this should only be invoked
54 /// through RegisterPass.
55 PassInfo(const char *name, const char *arg, const void *pi,
56 NormalCtor_t normal, bool isCFGOnly, bool is_analysis)
57 : PassName(name), PassArgument(arg), PassID(pi),
58 IsCFGOnlyPass(isCFGOnly),
59 IsAnalysis(is_analysis), IsAnalysisGroup(false), NormalCtor(normal) { }
60 /// PassInfo ctor - Do not call this directly, this should only be invoked
61 /// through RegisterPass. This version is for use by analysis groups; it
62 /// does not auto-register the pass.
63 PassInfo(const char *name, const void *pi)
64 : PassName(name), PassArgument(""), PassID(pi),
66 IsAnalysis(false), IsAnalysisGroup(true), NormalCtor(0) { }
68 /// getPassName - Return the friendly name for the pass, never returns null
70 const char *getPassName() const { return PassName; }
72 /// getPassArgument - Return the command line option that may be passed to
73 /// 'opt' that will cause this pass to be run. This will return null if there
76 const char *getPassArgument() const { return PassArgument; }
78 /// getTypeInfo - Return the id object for the pass...
80 const void *getTypeInfo() const { return PassID; }
82 /// Return true if this PassID implements the specified ID pointer.
83 bool isPassID(const void *IDPtr) const {
84 return PassID == IDPtr;
87 /// isAnalysisGroup - Return true if this is an analysis group, not a normal
90 bool isAnalysisGroup() const { return IsAnalysisGroup; }
91 bool isAnalysis() const { return IsAnalysis; }
93 /// isCFGOnlyPass - return true if this pass only looks at the CFG for the
95 bool isCFGOnlyPass() const { return IsCFGOnlyPass; }
97 /// getNormalCtor - Return a pointer to a function, that when called, creates
98 /// an instance of the pass and returns it. This pointer may be null if there
99 /// is no default constructor for the pass.
101 NormalCtor_t getNormalCtor() const {
104 void setNormalCtor(NormalCtor_t Ctor) {
108 /// createPass() - Use this method to create an instance of this pass.
109 Pass *createPass() const;
111 /// addInterfaceImplemented - This method is called when this pass is
112 /// registered as a member of an analysis group with the RegisterAnalysisGroup
115 void addInterfaceImplemented(const PassInfo *ItfPI) {
116 ItfImpl.push_back(ItfPI);
119 /// getInterfacesImplemented - Return a list of all of the analysis group
120 /// interfaces implemented by this pass.
122 const std::vector<const PassInfo*> &getInterfacesImplemented() const {
127 void operator=(const PassInfo &); // do not implement
128 PassInfo(const PassInfo &); // do not implement
131 #define INITIALIZE_PASS(passName, arg, name, cfg, analysis) \
132 void llvm::initialize##passName##Pass(PassRegistry &Registry) { \
133 PassInfo *PI = new PassInfo(name, arg, & passName ::ID, \
134 PassInfo::NormalCtor_t(callDefaultCtor< passName >), cfg, analysis); \
135 Registry.registerPass(*PI); \
137 static RegisterPass<passName> passName ## _info(arg, name, cfg, analysis);
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, &passName::ID,
167 PassInfo::NormalCtor_t(callDefaultCtor<passName>),
168 CFGOnly, is_analysis) {
169 PassRegistry::getPassRegistry()->registerPass(*this);
174 /// RegisterAnalysisGroup - Register a Pass as a member of an analysis _group_.
175 /// Analysis groups are used to define an interface (which need not derive from
176 /// Pass) that is required by passes to do their job. Analysis Groups differ
177 /// from normal analyses because any available implementation of the group will
178 /// be used if it is available.
180 /// If no analysis implementing the interface is available, a default
181 /// implementation is created and added. A pass registers itself as the default
182 /// implementation by specifying 'true' as the second template argument of this
185 /// In addition to registering itself as an analysis group member, a pass must
186 /// register itself normally as well. Passes may be members of multiple groups
187 /// and may still be "required" specifically by name.
189 /// The actual interface may also be registered as well (by not specifying the
190 /// second template argument). The interface should be registered to associate
191 /// a nice name with the interface.
193 class RegisterAGBase : public PassInfo {
195 RegisterAGBase(const char *Name,
196 const void *InterfaceID,
197 const void *PassID = 0,
198 bool isDefault = false);
201 template<typename Interface, bool Default = false>
202 struct RegisterAnalysisGroup : public RegisterAGBase {
203 explicit RegisterAnalysisGroup(PassInfo &RPB)
204 : RegisterAGBase(RPB.getPassName(),
205 &Interface::ID, RPB.getTypeInfo(),
209 explicit RegisterAnalysisGroup(const char *Name)
210 : RegisterAGBase(Name, &Interface::ID) {
214 #define INITIALIZE_ANALYSIS_GROUP(agName, name) \
215 void llvm::initialize##agName##AnalysisGroup(PassRegistry &Registry) { \
216 PassInfo *AI = new PassInfo(name, & agName :: ID); \
217 Registry.registerAnalysisGroup(& agName ::ID, 0, *AI, false); \
219 static RegisterAnalysisGroup<agName> agName##_info (name);
221 #define INITIALIZE_AG_PASS(passName, agName, arg, name, cfg, analysis, def) \
222 void llvm::initialize##passName##Pass(PassRegistry &Registry) { \
223 PassInfo *PI = new PassInfo(name, arg, & passName ::ID, \
224 PassInfo::NormalCtor_t(callDefaultCtor< passName >), cfg, analysis); \
225 Registry.registerPass(*PI); \
227 PassInfo *AI = new PassInfo(name, & agName :: ID); \
228 Registry.registerAnalysisGroup(& agName ::ID, & passName ::ID, *AI, def); \
230 static RegisterPass<passName> passName ## _info(arg, name, cfg, analysis); \
231 static RegisterAnalysisGroup<agName, def> passName ## _ag(passName ## _info);
233 //===---------------------------------------------------------------------------
234 /// PassRegistrationListener class - This class is meant to be derived from by
235 /// clients that are interested in which passes get registered and unregistered
236 /// at runtime (which can be because of the RegisterPass constructors being run
237 /// as the program starts up, or may be because a shared object just got
238 /// loaded). Deriving from the PassRegistationListener class automatically
239 /// registers your object to receive callbacks indicating when passes are loaded
242 struct PassRegistrationListener {
244 /// PassRegistrationListener ctor - Add the current object to the list of
245 /// PassRegistrationListeners...
246 PassRegistrationListener();
248 /// dtor - Remove object from list of listeners...
250 virtual ~PassRegistrationListener();
252 /// Callback functions - These functions are invoked whenever a pass is loaded
253 /// or removed from the current executable.
255 virtual void passRegistered(const PassInfo *) {}
257 /// enumeratePasses - Iterate over the registered passes, calling the
258 /// passEnumerate callback on each PassInfo object.
260 void enumeratePasses();
262 /// passEnumerate - Callback function invoked when someone calls
263 /// enumeratePasses on this PassRegistrationListener object.
265 virtual void passEnumerate(const PassInfo *) {}
269 } // End llvm namespace