private static IReadOnlyDictionary <K, V> MapDefinitions <K, V>(
SymbolMatcher map,
IReadOnlyDictionary <K, V> items)
where K : Cci.IDefinition
{
var result = new Dictionary <K, V>();
foreach (var pair in items)
{
var key = (K)map.MapDefinition(pair.Key);
// Result may be null if the definition was deleted, or if the definition
// was synthesized (e.g.: an iterator type) and the method that generated
// the synthesized definition was unchanged and not recompiled.
if (key != null)
{
result.Add(key, pair.Value);
}
}
return(result);
}
/// <summary>
/// Return a version of the baseline with all definitions mapped to this compilation.
/// Definitions from the initial generation, from metadata, are not mapped since
/// the initial generation is always included as metadata. That is, the symbols from
/// types, methods, ... in the TypesAdded, MethodsAdded, ... collections are replaced
/// by the corresponding symbols from the current compilation.
/// </summary>
private static EmitBaseline MapToCompilation(
CSharpCompilation compilation,
PEDeltaAssemblyBuilder moduleBeingBuilt)
{
var previousGeneration = moduleBeingBuilt.PreviousGeneration;
Debug.Assert(previousGeneration.Compilation != compilation);
if (previousGeneration.Ordinal == 0)
{
// Initial generation, nothing to map. (Since the initial generation
// is always loaded from metadata in the context of the current
// compilation, there's no separate mapping step.)
return(previousGeneration);
}
var map = new SymbolMatcher(
moduleBeingBuilt.GetAnonymousTypeMap(),
((CSharpCompilation)previousGeneration.Compilation).SourceAssembly,
new EmitContext((PEModuleBuilder)previousGeneration.PEModuleBuilder, null, new DiagnosticBag()),
compilation.SourceAssembly,
new EmitContext((Cci.IModule)moduleBeingBuilt, null, new DiagnosticBag()));
// Map all definitions to this compilation.
var typesAdded = MapDefinitions(map, previousGeneration.TypesAdded);
var eventsAdded = MapDefinitions(map, previousGeneration.EventsAdded);
var fieldsAdded = MapDefinitions(map, previousGeneration.FieldsAdded);
var methodsAdded = MapDefinitions(map, previousGeneration.MethodsAdded);
var propertiesAdded = MapDefinitions(map, previousGeneration.PropertiesAdded);
// Map anonymous types to this compilation.
var anonymousTypeMap = new Dictionary <AnonymousTypeKey, AnonymousTypeValue>();
foreach (var pair in previousGeneration.AnonymousTypeMap)
{
var key = pair.Key;
var value = pair.Value;
var type = (Cci.ITypeDefinition)map.MapDefinition(value.Type);
Debug.Assert(type != null);
anonymousTypeMap.Add(key, new AnonymousTypeValue(value.Name, value.UniqueIndex, type));
}
// Map locals (specifically, local types) to this compilation.
var locals = new Dictionary <uint, ImmutableArray <EncLocalInfo> >();
foreach (var pair in previousGeneration.LocalsForMethodsAddedOrChanged)
{
locals.Add(pair.Key, pair.Value.SelectAsArray((l, m) => MapLocalInfo(m, l), map));
}
return(previousGeneration.With(
compilation,
moduleBeingBuilt,
previousGeneration.Ordinal,
previousGeneration.EncId,
typesAdded,
eventsAdded,
fieldsAdded,
methodsAdded,
propertiesAdded,
eventMapAdded: previousGeneration.EventMapAdded,
propertyMapAdded: previousGeneration.PropertyMapAdded,
methodImplsAdded: previousGeneration.MethodImplsAdded,
tableEntriesAdded: previousGeneration.TableEntriesAdded,
blobStreamLengthAdded: previousGeneration.BlobStreamLengthAdded,
stringStreamLengthAdded: previousGeneration.StringStreamLengthAdded,
userStringStreamLengthAdded: previousGeneration.UserStringStreamLengthAdded,
guidStreamLengthAdded: previousGeneration.GuidStreamLengthAdded,
anonymousTypeMap: anonymousTypeMap,
localsForMethodsAddedOrChanged: locals,
localNames: previousGeneration.LocalNames));
}