public bool TryMatch(StatementCollection statements, out int startIndex, out Statement result, out int replacedStatementsCount)
{
replacedStatementsCount = 0;
startIndex = -1;
result = null;
bool inlinedSuccessfully = false;
if (statements.Count == 0)
{
return(false);
}
HashSet <VariableDefinition> markedForRemoval = new HashSet <VariableDefinition>();
List <int> positionsToInline = GetStatementsToInline(statements);
for (int i = positionsToInline.Count - 1; i >= 0; i--)
{
int index = positionsToInline[i];
ExpressionStatement defineExpression = statements[index] as ExpressionStatement;
VariableDefinition variable = ((defineExpression.Expression as BinaryExpression).Left as VariableReferenceExpression).Variable.Resolve();
if (index == statements.Count - 1 || !string.IsNullOrEmpty(defineExpression.Label))
{
markedForRemoval.Add(variable);
continue;
}
List <Instruction> instructions = new List <Instruction>(defineExpression.Expression.MappedInstructions);
instructions.AddRange((defineExpression.Expression as BinaryExpression).Left.UnderlyingSameMethodInstructions);
Expression value = (defineExpression.Expression as BinaryExpression).Right.CloneAndAttachInstructions(instructions);
ICodeNode resultNode;
if (inliner.TryInlineVariable(variable, value, statements[index + 1], ShouldInlineAggressively(variable), out resultNode))
{
statements.RemoveAt(index);
inlinedSuccessfully = true;
markedForRemoval.Add(variable);
methodContext.RemoveVariable(variable);
// the statement containing the inlined variable is not at index, since we removed the variable declaration statement
statements[index] = (Statement)this.dereferencer.Visit(statements[index]);
}
}
foreach (VariableDefinition variable in markedForRemoval)
{
patternsContext.VariableToSingleAssignmentMap.Remove(variable);
patternsContext.VariableToDefineUseCountContext.Remove(variable);
}
return(inlinedSuccessfully);
}
