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//===-- Annotation.cpp - Implement the Annotation Classes -----------------===//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by the LLVM research group and is distributed under
// the University of Illinois Open Source License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements the AnnotationManager class.
//
//===----------------------------------------------------------------------===//
#include <map>
#include "Support/Annotation.h"
using namespace llvm;
Annotation::~Annotation() {} // Designed to be subclassed
Annotable::~Annotable() { // Virtual because it's designed to be subclassed...
Annotation *A = AnnotationList;
while (A) {
Annotation *Next = A->getNext();
delete A;
A = Next;
}
}
typedef std::map<const std::string, unsigned> IDMapType;
static unsigned IDCounter = 0; // Unique ID counter
// Static member to ensure initialiation on demand.
static IDMapType &getIDMap() { static IDMapType TheMap; return TheMap; }
// On demand annotation creation support...
typedef Annotation *(*AnnFactory)(AnnotationID, const Annotable *, void *);
typedef std::map<unsigned, std::pair<AnnFactory,void*> > FactMapType;
static FactMapType *TheFactMap = 0;
static FactMapType &getFactMap() {
if (TheFactMap == 0)
TheFactMap = new FactMapType();
return *TheFactMap;
}
static void eraseFromFactMap(unsigned ID) {
assert(TheFactMap && "No entries found!");
TheFactMap->erase(ID);
if (TheFactMap->empty()) { // Delete when empty
delete TheFactMap;
TheFactMap = 0;
}
}
AnnotationID AnnotationManager::getID(const std::string &Name) { // Name -> ID
IDMapType::iterator I = getIDMap().find(Name);
if (I == getIDMap().end()) {
getIDMap()[Name] = IDCounter++; // Add a new element
return IDCounter-1;
}
return I->second;
}
// getID - Name -> ID + registration of a factory function for demand driven
// annotation support.
AnnotationID AnnotationManager::getID(const std::string &Name, Factory Fact,
void *Data) {
AnnotationID Result(getID(Name));
registerAnnotationFactory(Result, Fact, Data);
return Result;
}
// getName - This function is especially slow, but that's okay because it should
// only be used for debugging.
//
const std::string &AnnotationManager::getName(AnnotationID ID) { // ID -> Name
IDMapType &TheMap = getIDMap();
for (IDMapType::iterator I = TheMap.begin(); ; ++I) {
assert(I != TheMap.end() && "Annotation ID is unknown!");
if (I->second == ID.ID) return I->first;
}
}
// registerAnnotationFactory - This method is used to register a callback
// function used to create an annotation on demand if it is needed by the
// Annotable::findOrCreateAnnotation method.
//
void AnnotationManager::registerAnnotationFactory(AnnotationID ID,
AnnFactory F,
void *ExtraData) {
if (F)
getFactMap()[ID.ID] = std::make_pair(F, ExtraData);
else
eraseFromFactMap(ID.ID);
}
// createAnnotation - Create an annotation of the specified ID for the
// specified object, using a register annotation creation function.
//
Annotation *AnnotationManager::createAnnotation(AnnotationID ID,
const Annotable *Obj) {
FactMapType::iterator I = getFactMap().find(ID.ID);
if (I == getFactMap().end()) return 0;
return I->second.first(ID, Obj, I->second.second);
}
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