Add annotation support

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@366 91177308-0d34-0410-b5e6-96231b3b80d8

support/lib/Support/Annotation.cpp

@@ -0,0 +1,63 @@
+//===-- Annotation.cpp - Implement the Annotation Classes --------*- C++ -*--=//
+//
+// This file implements the AnnotationManager class.
+//
+//===----------------------------------------------------------------------===//
+
+#include <map>
+#include "llvm/Annotation.h"
+
+typedef map<const 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, Annotable *);
+typedef map<unsigned, AnnFactory> FactMapType;
+static FactMapType &getFactMap() { static FactMapType FactMap; return FactMap; }
+
+
+AnnotationID AnnotationManager::getID(const 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;
+}
+
+// getName - This function is especially slow, but that's okay because it should
+// only be used for debugging.
+//
+const 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) {
+  if (F)
+    getFactMap()[ID.ID] = F;
+  else
+    getFactMap().erase(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, 
+						Annotable *Obj) {
+  FactMapType::iterator I = getFactMap().find(ID.ID);
+  if (I == getFactMap().end()) return 0;
+  return I->second(ID, Obj);
+}