src/visualizer.cpp

   1 /** @file */
   2 ////////////////////////////////////////////////////////////////////////////////////////
   3 //
   4 //    This file is part of Boost Statechart Viewer.
   5 //
   6 //    Boost Statechart Viewer is free software: you can redistribute it and/or modify
   7 //    it under the terms of the GNU General Public License as published by
   8 //    the Free Software Foundation, either version 3 of the License, or
   9 //    (at your option) any later version.
  10 //
  11 //    Boost Statechart Viewer is distributed in the hope that it will be useful,
  12 //    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 //    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 //    GNU General Public License for more details.
  15 //
  16 //    You should have received a copy of the GNU General Public License
  17 //    along with Boost Statechart Viewer.  If not, see <http://www.gnu.org/licenses/>.
  18 //
  19 ////////////////////////////////////////////////////////////////////////////////////////
  20
  21 //standard header files
  22 #include <iomanip>
  23 #include <fstream>
  24 #include <map>
  25 #include <vector>
  26
  27 //LLVM Header files
  28 #include "llvm/Support/raw_ostream.h"
  29 #include "llvm/Support/raw_os_ostream.h"
  30
  31 //clang header files
  32 #include "clang/AST/ASTConsumer.h"
  33 #include "clang/AST/ASTContext.h"
  34 #include "clang/AST/CXXInheritance.h"
  35 #include "clang/AST/RecursiveASTVisitor.h"
  36 #include "clang/Frontend/CompilerInstance.h"
  37 #include "clang/Frontend/FrontendPluginRegistry.h"
  38
  39 using namespace clang;
  40 using namespace std;
  41
  42 namespace Model
  43 {
  44
  45     inline int getIndentLevelIdx() {
  46         static int i = ios_base::xalloc();
  47         return i;
  48     }
  49
  50     ostream& indent(ostream& os) { os << setw(2*os.iword(getIndentLevelIdx())) << ""; return os; }
  51     ostream& indent_inc(ostream& os) { os.iword(getIndentLevelIdx())++; return os; }
  52     ostream& indent_dec(ostream& os) { os.iword(getIndentLevelIdx())--; return os; }
  53
  54     class State;
  55
  56     class Context : public map<string, State*> {
  57     public:
  58         iterator add(State *state);
  59         Context *findContext(const string &name);
  60     };
  61
  62     class State : public Context
  63     {
  64         string initialInnerState;
  65         list<string> defferedEvents;
  66         list<string> inStateEvents;
  67         bool noTypedef;
  68     public:
  69         const string name;
  70         explicit State(string name) : noTypedef(false), name(name) {}
  71         void setInitialInnerState(string name) { initialInnerState = name; }
  72         void addDeferredEvent(const string &name) { defferedEvents.push_back(name); }
  73         void addInStateEvent(const string &name) { inStateEvents.push_back(name); }
  74         void setNoTypedef() { noTypedef = true;}
  75         friend ostream& operator<<(ostream& os, const State& s);
  76     };
  77
  78
  79     Context::iterator Context::add(State *state)
  80     {
  81         pair<iterator, bool> ret =  insert(value_type(state->name, state));
  82         return ret.first;
  83     }
  84
  85     Context *Context::findContext(const string &name)
  86     {
  87         iterator i = find(name), e;
  88         if (i != end())
  89             return i->second;
  90         for (i = begin(), e = end(); i != e; ++i) {
  91             Context *c = i->second->findContext(name);
  92             if (c)
  93                 return c;
  94         }
  95         return 0;
  96     }
  97
  98     ostream& operator<<(ostream& os, const Context& c);
  99
 100     ostream& operator<<(ostream& os, const State& s)
 101     {
 102         string label = s.name;
 103         for (list<string>::const_iterator i = s.defferedEvents.begin(), e = s.defferedEvents.end(); i != e; ++i)
 104             label.append("<br />").append(*i).append(" / defer");
 105         for (list<string>::const_iterator i = s.inStateEvents.begin(), e = s.inStateEvents.end(); i != e; ++i)
 106             label.append("<br />").append(*i).append(" / in state");
 107         if (s.noTypedef) os << indent << s.name << " [label=<" << label << ">, color=\"red\"]\n";
 108         else os << indent << s.name << " [label=<" << label << ">]\n";
 109         if (s.size()) {
 110             os << indent << s.name << " -> " << s.initialInnerState << " [style = dashed]\n";
 111             os << indent << "subgraph cluster_" << s.name << " {\n" << indent_inc;
 112             os << indent << "label = \"" << s.name << "\"\n";
 113             os << indent << s.initialInnerState << " [peripheries=2]\n";
 114             os << static_cast<Context>(s);
 115             os << indent_dec << indent << "}\n";
 116         }
 117         return os;
 118     }
 119
 120
 121     ostream& operator<<(ostream& os, const Context& c)
 122     {
 123         for (Context::const_iterator i = c.begin(), e = c.end(); i != e; i++) {
 124             os << *i->second;
 125         }
 126         return os;
 127     }
 128
 129
 130     class Transition
 131     {
 132     public:
 133         const string src, dst, event;
 134         Transition(string src, string dst, string event) : src(src), dst(dst), event(event) {}
 135     };
 136
 137     ostream& operator<<(ostream& os, const Transition& t)
 138     {
 139         os << indent << t.src << " -> " << t.dst << " [label = \"" << t.event << "\"]\n";
 140         return os;
 141     }
 142
 143
 144     class Machine : public Context
 145     {
 146     protected:
 147         string initial_state;
 148     public:
 149         const string name;
 150         explicit Machine(string name) : name(name) {}
 151
 152         void setInitialState(string name) { initial_state = name; }
 153
 154         friend ostream& operator<<(ostream& os, const Machine& m);
 155     };
 156
 157     ostream& operator<<(ostream& os, const Machine& m)
 158     {
 159         os << indent << "subgraph " << m.name << " {\n" << indent_inc;
 160         os << indent << m.initial_state << " [peripheries=2]\n";
 161         os << static_cast<Context>(m);
 162         os << indent_dec << indent << "}\n";
 163         return os;
 164     }
 165
 166
 167     class Model : public map<string, Machine>
 168     {
 169         Context undefined;      // For forward-declared state classes
 170     public:
 171         list< Transition*> transitions;
 172
 173         iterator add(const Machine &m)
 174         {
 175             pair<iterator, bool> ret =  insert(value_type(m.name, m));
 176             return ret.first;
 177         }
 178
 179         void addUndefinedState(State *m)
 180         {
 181             undefined[m->name] = m;
 182         }
 183
 184
 185         Context *findContext(const string &name)
 186         {
 187             Context::iterator ci = undefined.find(name);
 188             if (ci != undefined.end())
 189                 return ci->second;
 190             iterator i = find(name), e;
 191             if (i != end())
 192                 return &i->second;
 193             for (i = begin(), e = end(); i != e; ++i) {
 194                 Context *c = i->second.findContext(name);
 195                 if (c)
 196                     return c;
 197             }
 198             return 0;
 199         }
 200
 201         State *findState(const string &name)
 202         {
 203             for (iterator i = begin(), e = end(); i != e; ++i) {
 204                 Context *c = i->second.findContext(name);
 205                 if (c)
 206                     return static_cast<State*>(c);
 207             }
 208             return 0;
 209         }
 210
 211
 212         State *removeFromUndefinedContexts(const string &name)
 213         {
 214             Context::iterator ci = undefined.find(name);
 215             if (ci == undefined.end())
 216                 return 0;
 217             undefined.erase(ci);
 218             return ci->second;
 219         }
 220
 221         void write_as_dot_file(string fn)
 222         {
 223             ofstream f(fn.c_str());
 224             f << "digraph statecharts {\n" << indent_inc;
 225             for (iterator i = begin(), e = end(); i != e; i++)
 226                 f << i->second;
 227             for (list<Transition*>::iterator t = transitions.begin(), e = transitions.end(); t != e; ++t)
 228                 f << **t;
 229             f << indent_dec << "}\n";
 230         }
 231     };
 232 };
 233
 234
 235 class MyCXXRecordDecl : public CXXRecordDecl
 236 {
 237     static bool FindBaseClassString(const CXXBaseSpecifier *Specifier,
 238                                     CXXBasePath &Path,
 239                                     void *qualName)
 240     {
 241         string qn(static_cast<const char*>(qualName));
 242         const RecordType *rt = Specifier->getType()->getAs<RecordType>();
 243         assert(rt);
 244         TagDecl *canon = rt->getDecl()->getCanonicalDecl();
 245         return canon->getQualifiedNameAsString() == qn;
 246     }
 247
 248 public:
 249     bool isDerivedFrom(const char *baseStr, CXXBaseSpecifier const **Base = 0) const {
 250         CXXBasePaths Paths(/*FindAmbiguities=*/false, /*RecordPaths=*/!!Base, /*DetectVirtual=*/false);
 251         Paths.setOrigin(const_cast<MyCXXRecordDecl*>(this));
 252         if (!lookupInBases(&FindBaseClassString, const_cast<char*>(baseStr), Paths))
 253             return false;
 254         if (Base)
 255             *Base = Paths.front().back().Base;
 256         return true;
 257     }
 258 };
 259
 260 class FindTransitVisitor : public RecursiveASTVisitor<FindTransitVisitor>
 261 {
 262     Model::Model &model;
 263     const CXXRecordDecl *SrcState;
 264     const Type *EventType;
 265 public:
 266     explicit FindTransitVisitor(Model::Model &model, const CXXRecordDecl *SrcState, const Type *EventType)
 267         : model(model), SrcState(SrcState), EventType(EventType) {}
 268
 269     bool VisitMemberExpr(MemberExpr *E) {
 270         if (E->getMemberNameInfo().getAsString() == "defer_event") {
 271                 CXXRecordDecl *Event = EventType->getAsCXXRecordDecl();
 272
 273                 Model::State *s = model.findState(SrcState->getName());
 274                 assert(s);
 275                 s->addDeferredEvent(Event->getName());
 276         } else if (E->getMemberNameInfo().getAsString() != "transit")
 277             return true;
 278         if (E->hasExplicitTemplateArgs()) {
 279             const Type *DstStateType = E->getExplicitTemplateArgs()[0].getArgument().getAsType().getTypePtr();
 280             CXXRecordDecl *DstState = DstStateType->getAsCXXRecordDecl();
 281             CXXRecordDecl *Event = EventType->getAsCXXRecordDecl();
 282             Model::Transition *T = new Model::Transition(SrcState->getName(), DstState->getName(), Event->getName());
 283             model.transitions.push_back(T);
 284         }
 285         return true;
 286     }
 287 };
 288
 289 class Visitor : public RecursiveASTVisitor<Visitor>
 290 {
 291     struct eventModel {
 292         string name;
 293         SourceLocation loc;
 294         eventModel(string ev, SourceLocation sourceLoc) : name(ev), loc(sourceLoc){}
 295     };
 296     struct testEventModel {
 297         string eventName;
 298         testEventModel(string name) : eventName(name){}
 299         bool operator() (const eventModel& model) {
 300             if (eventName.compare(model.name) == 0)
 301                 return true;
 302             return false;
 303         }
 304     };
 305     ASTContext *ASTCtx;
 306     Model::Model &model;
 307     DiagnosticsEngine &Diags;
 308     unsigned diag_unhandled_reaction_type, diag_unhandled_reaction_decl,
 309         diag_found_state, diag_found_statemachine, diag_no_history, diag_missing_reaction, diag_warning;
 310     std::vector<bool> reactMethodInReactions; // Indicates whether i-th react method is referenced from typedef reactions.
 311     std::list<eventModel> listOfDefinedEvents;
 312
 313 public:
 314     bool shouldVisitTemplateInstantiations() const { return true; }
 315
 316     explicit Visitor(ASTContext *Context, Model::Model &model, DiagnosticsEngine &Diags)
 317         : ASTCtx(Context), model(model), Diags(Diags)
 318     {
 319         diag_found_statemachine =
 320             Diags.getCustomDiagID(DiagnosticsEngine::Note, "Found statemachine '%0'");
 321         diag_found_state =
 322             Diags.getCustomDiagID(DiagnosticsEngine::Note, "Found state '%0'");
 323         diag_unhandled_reaction_type =
 324             Diags.getCustomDiagID(DiagnosticsEngine::Error, "Unhandled reaction type '%0'");
 325         diag_unhandled_reaction_decl =
 326             Diags.getCustomDiagID(DiagnosticsEngine::Error, "Unhandled reaction decl '%0'");
 327         diag_no_history =
 328             Diags.getCustomDiagID(DiagnosticsEngine::Error, "History is not yet supported");
 329         diag_missing_reaction =
 330             Diags.getCustomDiagID(DiagnosticsEngine::Error, "Missing react method for event '%0'");
 331         diag_warning =
 332             Diags.getCustomDiagID(DiagnosticsEngine::Warning, "'%0' %1");
 333     }
 334
 335     DiagnosticBuilder Diag(SourceLocation Loc, unsigned DiagID) { return Diags.Report(Loc, DiagID); }
 336
 337     void checkAllReactMethods(const CXXRecordDecl *SrcState)
 338     {
 339         unsigned i = 0;
 340         IdentifierInfo& II = ASTCtx->Idents.get("react");
 341         for (DeclContext::lookup_const_result ReactRes = SrcState->lookup(DeclarationName(&II));
 342              ReactRes.first != ReactRes.second; ++ReactRes.first, ++i) {
 343             if (i >= reactMethodInReactions.size() || reactMethodInReactions[i] == false) {
 344                 CXXMethodDecl *React = dyn_cast<CXXMethodDecl>(*ReactRes.first);
 345                 Diag(React->getParamDecl(0)->getLocStart(), diag_warning)
 346                     << React->getParamDecl(0)->getType().getAsString() << " missing in typedef reactions";
 347             }
 348         }
 349     }
 350
 351     bool HandleCustomReaction(const CXXRecordDecl *SrcState, const Type *EventType)
 352     {
 353         unsigned i = 0;
 354         IdentifierInfo& II = ASTCtx->Idents.get("react");
 355         // TODO: Lookup for react even in base classes - probably by using Sema::LookupQualifiedName()
 356         for (DeclContext::lookup_const_result ReactRes = SrcState->lookup(DeclarationName(&II));
 357              ReactRes.first != ReactRes.second; ++ReactRes.first) {
 358             if (CXXMethodDecl *React = dyn_cast<CXXMethodDecl>(*ReactRes.first)) {
 359                 if (React->getNumParams() >= 1) {
 360                     const ParmVarDecl *p = React->getParamDecl(0);
 361                     const Type *ParmType = p->getType().getTypePtr();
 362                     if (i == reactMethodInReactions.size()) reactMethodInReactions.push_back(false);
 363                     if (ParmType->isLValueReferenceType())
 364                         ParmType = dyn_cast<LValueReferenceType>(ParmType)->getPointeeType().getTypePtr();
 365                     if (ParmType == EventType) {
 366                         FindTransitVisitor(model, SrcState, EventType).TraverseStmt(React->getBody());
 367                         reactMethodInReactions[i] = true;
 368                         return true;
 369                     }
 370                 } else
 371                     Diag(React->getLocStart(), diag_warning)
 372                         << React << "has not a parameter";
 373             } else
 374                 Diag((*ReactRes.first)->getSourceRange().getBegin(), diag_warning)
 375                     << (*ReactRes.first)->getDeclKindName() << "is not supported as react method";
 376             i++;
 377         }
 378         return false;
 379     }
 380
 381     void HandleReaction(const Type *T, const SourceLocation Loc, CXXRecordDecl *SrcState)
 382     {
 383         // TODO: Improve Loc tracking
 384         if (const ElaboratedType *ET = dyn_cast<ElaboratedType>(T))
 385             HandleReaction(ET->getNamedType().getTypePtr(), Loc, SrcState);
 386         else if (const TemplateSpecializationType *TST = dyn_cast<TemplateSpecializationType>(T)) {
 387             string name = TST->getTemplateName().getAsTemplateDecl()->getQualifiedNameAsString();
 388             if (name == "boost::statechart::transition") {
 389                 const Type *EventType = TST->getArg(0).getAsType().getTypePtr();
 390                 const Type *DstStateType = TST->getArg(1).getAsType().getTypePtr();
 391                 CXXRecordDecl *Event = EventType->getAsCXXRecordDecl();
 392                 CXXRecordDecl *DstState = DstStateType->getAsCXXRecordDecl();
 393                 listOfDefinedEvents.remove_if(testEventModel(Event->getNameAsString()));
 394
 395                 Model::Transition *T = new Model::Transition(SrcState->getName(), DstState->getName(), Event->getName());
 396                 model.transitions.push_back(T);
 397             } else if (name == "boost::statechart::custom_reaction") {
 398                 const Type *EventType = TST->getArg(0).getAsType().getTypePtr();
 399                 if (!HandleCustomReaction(SrcState, EventType)) {
 400                     Diag(SrcState->getLocation(), diag_missing_reaction) << EventType->getAsCXXRecordDecl()->getName();
 401                 }
 402                 listOfDefinedEvents.remove_if(testEventModel(EventType->getAsCXXRecordDecl()->getNameAsString()));
 403             } else if (name == "boost::statechart::deferral") {
 404                 const Type *EventType = TST->getArg(0).getAsType().getTypePtr();
 405                 CXXRecordDecl *Event = EventType->getAsCXXRecordDecl();
 406                 listOfDefinedEvents.remove_if(testEventModel(Event->getNameAsString()));
 407
 408                 Model::State *s = model.findState(SrcState->getName());
 409                 assert(s);
 410                 s->addDeferredEvent(Event->getName());
 411             } else if (name == "boost::mpl::list") {
 412                 for (TemplateSpecializationType::iterator Arg = TST->begin(), End = TST->end(); Arg != End; ++Arg)
 413                     HandleReaction(Arg->getAsType().getTypePtr(), Loc, SrcState);
 414             } else if (name == "boost::statechart::in_state_reaction") {
 415                 const Type *EventType = TST->getArg(0).getAsType().getTypePtr();
 416                 CXXRecordDecl *Event = EventType->getAsCXXRecordDecl();
 417                 listOfDefinedEvents.remove_if(testEventModel(Event->getNameAsString()));
 418
 419                 Model::State *s = model.findState(SrcState->getName());
 420                 assert(s);
 421                 s->addInStateEvent(Event->getName());
 422
 423             } else
 424                 Diag(Loc, diag_unhandled_reaction_type) << name;
 425         } else
 426             Diag(Loc, diag_unhandled_reaction_type) << T->getTypeClassName();
 427     }
 428
 429     void HandleReaction(const NamedDecl *Decl, CXXRecordDecl *SrcState)
 430     {
 431         if (const TypedefDecl *r = dyn_cast<TypedefDecl>(Decl))
 432             HandleReaction(r->getCanonicalDecl()->getUnderlyingType().getTypePtr(),
 433                            r->getLocStart(), SrcState);
 434         else
 435             Diag(Decl->getLocation(), diag_unhandled_reaction_decl) << Decl->getDeclKindName();
 436         checkAllReactMethods(SrcState);
 437     }
 438
 439     TemplateArgumentLoc getTemplateArgLoc(const TypeLoc &T, unsigned ArgNum, bool ignore)
 440     {
 441         if (const ElaboratedTypeLoc *ET = dyn_cast<ElaboratedTypeLoc>(&T))
 442             return getTemplateArgLoc(ET->getNamedTypeLoc(), ArgNum, ignore);
 443         else if (const TemplateSpecializationTypeLoc *TST = dyn_cast<TemplateSpecializationTypeLoc>(&T)) {
 444             if (TST->getNumArgs() >= ArgNum+1) {
 445                 return TST->getArgLoc(ArgNum);
 446             } else
 447                 if (!ignore)
 448                     Diag(TST->getBeginLoc(), diag_warning) << TST->getType()->getTypeClassName() << "has not enough arguments" << TST->getSourceRange();
 449         } else
 450             Diag(T.getBeginLoc(), diag_warning) << T.getType()->getTypeClassName() << "type as template argument is not supported" << T.getSourceRange();
 451         return TemplateArgumentLoc();
 452     }
 453
 454     TemplateArgumentLoc getTemplateArgLocOfBase(const CXXBaseSpecifier *Base, unsigned ArgNum, bool ignore) {
 455         return getTemplateArgLoc(Base->getTypeSourceInfo()->getTypeLoc(), ArgNum, ignore);
 456     }
 457
 458     CXXRecordDecl *getTemplateArgDeclOfBase(const CXXBaseSpecifier *Base, unsigned ArgNum, TemplateArgumentLoc &Loc, bool ignore = false) {
 459         Loc = getTemplateArgLocOfBase(Base, ArgNum, ignore);
 460         switch (Loc.getArgument().getKind()) {
 461         case TemplateArgument::Type:
 462             return Loc.getTypeSourceInfo()->getType()->getAsCXXRecordDecl();
 463         case TemplateArgument::Null:
 464             // Diag() was already called
 465             break;
 466         default:
 467             Diag(Loc.getSourceRange().getBegin(), diag_warning) << Loc.getArgument().getKind() << "unsupported kind" << Loc.getSourceRange();
 468         }
 469         return 0;
 470     }
 471
 472     CXXRecordDecl *getTemplateArgDeclOfBase(const CXXBaseSpecifier *Base, unsigned ArgNum, bool ignore = false) {
 473         TemplateArgumentLoc Loc;
 474         return getTemplateArgDeclOfBase(Base, ArgNum, Loc, ignore);
 475     }
 476
 477     void handleSimpleState(CXXRecordDecl *RecordDecl, const CXXBaseSpecifier *Base)
 478     {
 479         int typedef_num = 0;
 480         string name(RecordDecl->getName()); //getQualifiedNameAsString());
 481         Diag(RecordDecl->getLocStart(), diag_found_state) << name;
 482         reactMethodInReactions.clear();
 483
 484         Model::State *state;
 485         // Either we saw a reference to forward declared state
 486         // before, or we create a new state.
 487         if (!(state = model.removeFromUndefinedContexts(name)))
 488             state = new Model::State(name);
 489
 490         CXXRecordDecl *Context = getTemplateArgDeclOfBase(Base, 1);
 491         if (Context) {
 492             Model::Context *c = model.findContext(Context->getName());
 493             if (!c) {
 494                 Model::State *s = new Model::State(Context->getName());
 495                 model.addUndefinedState(s);
 496                 c = s;
 497             }
 498             c->add(state);
 499         }
 500         //TODO support more innitial states
 501         TemplateArgumentLoc Loc;
 502         if (MyCXXRecordDecl *InnerInitialState =
 503             static_cast<MyCXXRecordDecl*>(getTemplateArgDeclOfBase(Base, 2, Loc, true))) {
 504               if (InnerInitialState->isDerivedFrom("boost::statechart::simple_state") ||
 505                 InnerInitialState->isDerivedFrom("boost::statechart::state_machine")) {
 506                   state->setInitialInnerState(InnerInitialState->getName());
 507             }
 508             else if (!InnerInitialState->getNameAsString().compare("boost::mpl::list<>"))
 509               Diag(Loc.getTypeSourceInfo()->getTypeLoc().getBeginLoc(), diag_warning)
 510                     << InnerInitialState->getName() << " as inner initial state is not supported" << Loc.getSourceRange();
 511         }
 512
 513 //          if (CXXRecordDecl *History = getTemplateArgDecl(Base->getType().getTypePtr(), 3))
 514 //              Diag(History->getLocStart(), diag_no_history);
 515
 516         IdentifierInfo& II = ASTCtx->Idents.get("reactions");
 517         // TODO: Lookup for reactions even in base classes - probably by using Sema::LookupQualifiedName()
 518         for (DeclContext::lookup_result Reactions = RecordDecl->lookup(DeclarationName(&II));
 519              Reactions.first != Reactions.second; ++Reactions.first, typedef_num++)
 520             HandleReaction(*Reactions.first, RecordDecl);
 521         if(typedef_num == 0) {
 522             Diag(RecordDecl->getLocStart(), diag_warning)
 523                 << RecordDecl->getName() << "state has no typedef for reactions";
 524             state->setNoTypedef();
 525         }
 526     }
 527
 528     void handleStateMachine(CXXRecordDecl *RecordDecl, const CXXBaseSpecifier *Base)
 529     {
 530         Model::Machine m(RecordDecl->getName());
 531         Diag(RecordDecl->getLocStart(), diag_found_statemachine) << m.name;
 532
 533         if (MyCXXRecordDecl *InitialState =
 534             static_cast<MyCXXRecordDecl*>(getTemplateArgDeclOfBase(Base, 1)))
 535             m.setInitialState(InitialState->getName());
 536         model.add(m);
 537     }
 538
 539     bool VisitCXXRecordDecl(CXXRecordDecl *Declaration)
 540     {
 541         if (!Declaration->isCompleteDefinition())
 542             return true;
 543         if (Declaration->getQualifiedNameAsString() == "boost::statechart::state" ||
 544             Declaration->getQualifiedNameAsString() == "TimedState" ||
 545             Declaration->getQualifiedNameAsString() == "TimedSimpleState" ||
 546             Declaration->getQualifiedNameAsString() == "boost::statechart::assynchronous_state_machine")
 547             return true; // This is an "abstract class" not a real state or real state machine
 548
 549         MyCXXRecordDecl *RecordDecl = static_cast<MyCXXRecordDecl*>(Declaration);
 550         const CXXBaseSpecifier *Base;
 551
 552         if (RecordDecl->isDerivedFrom("boost::statechart::simple_state", &Base))
 553             handleSimpleState(RecordDecl, Base);
 554         else if (RecordDecl->isDerivedFrom("boost::statechart::state_machine", &Base))
 555             handleStateMachine(RecordDecl, Base);
 556         else if (RecordDecl->isDerivedFrom("boost::statechart::event"))
 557             listOfDefinedEvents.push_back(eventModel(RecordDecl->getNameAsString(), RecordDecl->getLocation()));
 558         return true;
 559     }
 560     void printUnusedEventDefinitions() {
 561         for(list<eventModel>::iterator it = listOfDefinedEvents.begin(); it!=listOfDefinedEvents.end(); it++)
 562             Diag((*it).loc, diag_warning)
 563                 << (*it).name << "event defined but not used in any state";
 564     }
 565 };
 566
 567
 568 class VisualizeStatechartConsumer : public clang::ASTConsumer
 569 {
 570     Model::Model model;
 571     Visitor visitor;
 572     string destFileName;
 573 public:
 574     explicit VisualizeStatechartConsumer(ASTContext *Context, std::string destFileName,
 575                                          DiagnosticsEngine &D)
 576         : visitor(Context, model, D), destFileName(destFileName) {}
 577
 578     virtual void HandleTranslationUnit(clang::ASTContext &Context) {
 579         visitor.TraverseDecl(Context.getTranslationUnitDecl());
 580         visitor.printUnusedEventDefinitions();
 581         model.write_as_dot_file(destFileName);
 582     }
 583 };
 584
 585 class VisualizeStatechartAction : public PluginASTAction
 586 {
 587 protected:
 588   ASTConsumer *CreateASTConsumer(CompilerInstance &CI, llvm::StringRef) {
 589     size_t dot = getCurrentFile().find_last_of('.');
 590     std::string dest = getCurrentFile().substr(0, dot);
 591     dest.append(".dot");
 592     return new VisualizeStatechartConsumer(&CI.getASTContext(), dest, CI.getDiagnostics());
 593   }
 594
 595   bool ParseArgs(const CompilerInstance &CI,
 596                  const std::vector<std::string>& args) {
 597     for (unsigned i = 0, e = args.size(); i != e; ++i) {
 598       llvm::errs() << "Visualizer arg = " << args[i] << "\n";
 599
 600       // Example error handling.
 601       if (args[i] == "-an-error") {
 602         DiagnosticsEngine &D = CI.getDiagnostics();
 603         unsigned DiagID = D.getCustomDiagID(
 604           DiagnosticsEngine::Error, "invalid argument '" + args[i] + "'");
 605         D.Report(DiagID);
 606         return false;
 607       }
 608     }
 609     if (args.size() && args[0] == "help")
 610       PrintHelp(llvm::errs());
 611
 612     return true;
 613   }
 614   void PrintHelp(llvm::raw_ostream& ros) {
 615     ros << "Help for Visualize Statechart plugin goes here\n";
 616   }
 617
 618 };
 619
 620 static FrontendPluginRegistry::Add<VisualizeStatechartAction> X("visualize-statechart", "visualize statechart");
 621
 622 // Local Variables:
 623 // c-basic-offset: 4
 624 // End: