Pattern GetDuplicatedCode(MethodDefinition current, MethodDefinition target)
{
if (!CanCompareMethods(current, target))
{
return(null);
}
IList <Pattern> patterns = GetPatterns(current);
if (patterns.Count == 0)
{
return(null);
}
InstructionMatcher.Current = current;
InstructionMatcher.Target = target;
foreach (Pattern pattern in patterns)
{
if (pattern.IsCompilerGeneratedBlock || !pattern.IsExtractableToMethodBlock)
{
continue;
}
if (InstructionMatcher.Match(pattern, target.Body.Instructions))
{
WriteToOutput(current, target, pattern);
return(pattern);
}
}
return(null);
}
internal void ComputePrefixes(MethodDefinition method)
{
MethodDefinition target = InstructionMatcher.Target;
InstructionMatcher.Target = method;
try
{
int offset = 0;
if ((prefixes == null) || (prefixes.Length < instructions.Length))
{
prefixes = new int [instructions.Length];
}
for (int index = 1; index < instructions.Length; index++)
{
while (offset > 0 &&
!InstructionMatcher.AreEquivalent(instructions [offset], instructions [index]))
{
offset = prefixes [offset - 1];
}
if (InstructionMatcher.AreEquivalent(instructions [offset], instructions [index]))
{
offset++;
}
prefixes [index] = offset;
}
}
finally
{
InstructionMatcher.Target = target;
}
}
