protected override void OptimizePre()
{
// Removes excessive levels of nesting.
for (int i = 0; i < this.Statements.Count; i++)
{
StatementSilvernode thisStatement = this.Statements[i];
// Blocks cannot happen with blocks. Remove nested blocks (deeply)!
if (thisStatement is BlockSilvernode)
{
BlockSilvernode block = (BlockSilvernode)thisStatement;
this.Statements.RemoveAt(i);
this.Statements.InsertRange(i, block.Statements);
i--;
}
else if (thisStatement is StatementsSequenceSilvernode)
{
StatementsSequenceSilvernode sequence = (StatementsSequenceSilvernode)thisStatement;
sequence.OptimizeRecursively();
List <StatementSilvernode> points = sequence.List;
this.Statements.RemoveAt(i);
this.Statements.InsertRange(i, points);
i--;
}
}
}
public WhileSilvernode(
Silvernode condition,
List <ContractSilvernode> verificationConditions,
BlockSilvernode statementBlock,
SyntaxNode originalNode) : base(originalNode)
{
this.condition = condition;
this.verificationConditions = verificationConditions;
this.statementBlock = statementBlock;
}
protected SubroutineSilvernode(SyntaxNode originalNode,
IdentifierSilvernode identifier,
List <ParameterSilvernode> parameters,
string returnValueName,
TypeSilvernode returnType,
List <ContractSilvernode> verificationConditions,
BlockSilvernode block) : base(originalNode)
{
this.Identifier = identifier;
this.Parameters = parameters;
this.ReturnValueName = returnValueName;
this.ReturnType = returnType;
this.VerificationConditions = verificationConditions;
this.Block = block;
}
public FunctionSilvernode(SyntaxNode methodDeclarationSyntax,
IdentifierSilvernode identifierSilvernode,
List <ParameterSilvernode> parameters,
string returnName,
TypeSilvernode returnType,
List <ContractSilvernode> verificationConditions,
BlockSilvernode block)
: base(methodDeclarationSyntax,
identifierSilvernode,
parameters,
returnName,
returnType,
verificationConditions,
block)
{
}
protected override void OptimizePost()
{
// Removes the "goto end ; label end" sequence at the end if it's possible.
BlockSilvernode block = this.Children.FirstOrDefault(s => s is BlockSilvernode) as BlockSilvernode;
if (block != null)
{
int howManyGotos = block.Descendants.Count(sn => sn is GotoSilvernode && ((GotoSilvernode)sn).Label == Constants.SilverMethodEndLabel);
StatementSilvernode lastStatement = block.Statements.Count >= 1 ? block.Statements[block.Statements.Count - 1] : null;
StatementSilvernode preLastStatement = block.Statements.Count >= 2 ? block.Statements[block.Statements.Count - 2] : null;
if (lastStatement != null &&
(lastStatement.GetType() == typeof(LabelSilvernode) && ((LabelSilvernode)lastStatement).Label == Constants.SilverMethodEndLabel) &&
preLastStatement != null &&
(preLastStatement.GetType() == typeof(GotoSilvernode) && ((GotoSilvernode)preLastStatement).Label == Constants.SilverMethodEndLabel) &&
howManyGotos == 1)
{
block.Statements.RemoveRange(block.Statements.Count - 2, 2);
}
else if (howManyGotos == 0 && (lastStatement.GetType() == typeof(LabelSilvernode) && ((LabelSilvernode)lastStatement).Label == Constants.SilverMethodEndLabel))
{
block.Statements.RemoveAt(block.Statements.Count - 1);
}
}
}