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