1 //===-- Annotation.cpp - Implement the Annotation Classes --------*- C++ -*--=//
3 // This file implements the AnnotationManager class.
5 //===----------------------------------------------------------------------===//
8 #include "Support/Annotation.h"
14 typedef map<const string, unsigned> IDMapType;
15 static unsigned IDCounter = 0; // Unique ID counter
17 // Static member to ensure initialiation on demand.
18 static IDMapType &getIDMap() { static IDMapType TheMap; return TheMap; }
20 // On demand annotation creation support...
21 typedef Annotation *(*AnnFactory)(AnnotationID, const Annotable *, void *);
22 typedef map<unsigned, pair<AnnFactory,void*> > FactMapType;
24 static FactMapType *TheFactMap = 0;
25 static FactMapType &getFactMap() {
27 TheFactMap = new FactMapType();
31 static void eraseFromFactMap(unsigned ID) {
32 assert(TheFactMap && "No entries found!");
33 TheFactMap->erase(ID);
34 if (TheFactMap->empty()) { // Delete when empty
41 AnnotationID AnnotationManager::getID(const string &Name) { // Name -> ID
42 IDMapType::iterator I = getIDMap().find(Name);
43 if (I == getIDMap().end()) {
44 getIDMap()[Name] = IDCounter++; // Add a new element
50 // getID - Name -> ID + registration of a factory function for demand driven
51 // annotation support.
52 AnnotationID AnnotationManager::getID(const string &Name, Factory Fact,
54 AnnotationID Result(getID(Name));
55 registerAnnotationFactory(Result, Fact, Data);
60 // getName - This function is especially slow, but that's okay because it should
61 // only be used for debugging.
63 const string &AnnotationManager::getName(AnnotationID ID) { // ID -> Name
64 IDMapType &TheMap = getIDMap();
65 for (IDMapType::iterator I = TheMap.begin(); ; ++I) {
66 assert(I != TheMap.end() && "Annotation ID is unknown!");
67 if (I->second == ID.ID) return I->first;
72 // registerAnnotationFactory - This method is used to register a callback
73 // function used to create an annotation on demand if it is needed by the
74 // Annotable::findOrCreateAnnotation method.
76 void AnnotationManager::registerAnnotationFactory(AnnotationID ID,
80 getFactMap()[ID.ID] = make_pair(F, ExtraData);
82 eraseFromFactMap(ID.ID);
85 // createAnnotation - Create an annotation of the specified ID for the
86 // specified object, using a register annotation creation function.
88 Annotation *AnnotationManager::createAnnotation(AnnotationID ID,
89 const Annotable *Obj) {
90 FactMapType::iterator I = getFactMap().find(ID.ID);
91 if (I == getFactMap().end()) return 0;
92 return I->second.first(ID, Obj, I->second.second);