internal int?GetOldVariableIndex(int newIndex)
{
EnvironmentUpdateMapEntry environmentEntry = FindByNewIndex(this.VariableEntries, newIndex);
if (environmentEntry != null)
{
return(environmentEntry.IsAddition ? (int?)null : environmentEntry.OldOffset);
}
return(null);
}
static IList <EnvironmentUpdateMapEntry> Merge(int finalCount, IList <EnvironmentUpdateMapEntry> first,
IList <EnvironmentUpdateMapEntry> second)
{
List <EnvironmentUpdateMapEntry> result = new List <EnvironmentUpdateMapEntry>();
for (int i = 0; i < finalCount; i++)
{
EnvironmentUpdateMapEntry resultEntry = MergeEntry(i, first, second);
if (resultEntry != null)
{
result.Add(resultEntry);
}
}
return(result.Count > 0 ? result : null);
}
static EnvironmentUpdateMapEntry MergeEntry(int finalIndex, IList <EnvironmentUpdateMapEntry> first,
IList <EnvironmentUpdateMapEntry> second)
{
EnvironmentUpdateMapEntry secondEntry = FindByNewIndex(second, finalIndex);
EnvironmentUpdateMapEntry firstEntry;
if (secondEntry != null)
{
firstEntry = secondEntry.IsAddition ? null : FindByNewIndex(first, secondEntry.OldOffset);
}
else
{
firstEntry = FindByNewIndex(first, finalIndex);
}
return(EnvironmentUpdateMapEntry.Merge(firstEntry, secondEntry));
}
internal static EnvironmentUpdateMapEntry Merge(EnvironmentUpdateMapEntry first, EnvironmentUpdateMapEntry second)
{
if (first == null || second == null)
{
return(first ?? second);
}
Fx.Assert(first.NewOffset == second.OldOffset && !second.IsAddition, "Merging mismatched entries");
if (first.OldOffset == second.NewOffset)
{
return(null);
}
return(new EnvironmentUpdateMapEntry
{
OldOffset = first.OldOffset,
NewOffset = second.NewOffset,
IsNewHandle = first.IsNewHandle
});
}
internal static EnvironmentUpdateMapEntry Merge(EnvironmentUpdateMapEntry first, EnvironmentUpdateMapEntry second)
{
if (first == null || second == null)
{
return first ?? second;
}
Fx.Assert(first.NewOffset == second.OldOffset && !second.IsAddition, "Merging mismatched entries");
if (first.OldOffset == second.NewOffset)
{
return null;
}
return new EnvironmentUpdateMapEntry
{
OldOffset = first.OldOffset,
NewOffset = second.NewOffset,
IsNewHandle = first.IsNewHandle
};
}
