public UsingStatement TransformUsings(ExpressionStatement node)
{
Match m1 = variableAssignPattern.Match(node);
if (m1 == null)
{
return(null);
}
AstNode tryCatch = node.NextSibling;
Match m2 = usingTryCatchPattern.Match(tryCatch);
if (m2 == null)
{
return(null);
}
string variableName = m1.Get <IdentifierExpression>("variable").Single().Identifier;
if (variableName == m2.Get <IdentifierExpression>("ident").Single().Identifier)
{
if (m2.Has("valueType"))
{
// if there's no if(x!=null), then it must be a value type
ILVariable v = m1.Get("variable").Single().Annotation <ILVariable>();
if (v == null || v.Type == null || !v.Type.IsValueType)
{
return(null);
}
}
node.Remove();
BlockStatement body = m2.Get <BlockStatement>("body").Single();
UsingStatement usingStatement = new UsingStatement();
usingStatement.ResourceAcquisition = node.Expression.Detach();
usingStatement.EmbeddedStatement = body.Detach();
tryCatch.ReplaceWith(usingStatement);
// Move the variable declaration into the resource acquisition, if possible
// This is necessary for the foreach-pattern to work on the result of the using-pattern
VariableDeclarationStatement varDecl = FindVariableDeclaration(usingStatement, variableName);
if (varDecl != null && varDecl.Parent is BlockStatement)
{
Statement declarationPoint;
if (CanMoveVariableDeclarationIntoStatement(varDecl, usingStatement, out declarationPoint))
{
Debug.Assert(declarationPoint == usingStatement);
// Moving the variable into the UsingStatement is allowed:
usingStatement.ResourceAcquisition = new VariableDeclarationStatement {
Type = (AstType)varDecl.Type.Clone(),
Variables =
{
new VariableInitializer {
Name = variableName,
Initializer = m1.Get <Expression>("initializer").Single().Detach()
}.CopyAnnotationsFrom(usingStatement.ResourceAcquisition)
}
}.CopyAnnotationsFrom(node);
}
}
return(usingStatement);
}
return(null);
}
internal void HandleStaticFieldInitializers(IEnumerable <AstNode> members)
{
// Translate static constructor into field initializers if the class is BeforeFieldInit
var staticCtor = members.OfType <ConstructorDeclaration>().FirstOrDefault(c => (c.Modifiers & Modifiers.Static) == Modifiers.Static);
if (staticCtor != null)
{
IMethod ctorMethod = staticCtor.GetSymbol() as IMethod;
if (!ctorMethod.MetadataToken.IsNil)
{
var metadata = context.TypeSystem.MainModule.PEFile.Metadata;
SRM.MethodDefinition ctorMethodDef = metadata.GetMethodDefinition((SRM.MethodDefinitionHandle)ctorMethod.MetadataToken);
SRM.TypeDefinition declaringType = metadata.GetTypeDefinition(ctorMethodDef.GetDeclaringType());
if (declaringType.HasFlag(System.Reflection.TypeAttributes.BeforeFieldInit))
{
while (true)
{
ExpressionStatement es = staticCtor.Body.Statements.FirstOrDefault() as ExpressionStatement;
if (es == null)
{
break;
}
AssignmentExpression assignment = es.Expression as AssignmentExpression;
if (assignment == null || assignment.Operator != AssignmentOperatorType.Assign)
{
break;
}
IMember fieldOrProperty = (assignment.Left.GetSymbol() as IMember)?.MemberDefinition;
if (!(fieldOrProperty is IField || fieldOrProperty is IProperty) || !fieldOrProperty.IsStatic)
{
break;
}
AstNode fieldOrPropertyDecl = members.FirstOrDefault(f => f.GetSymbol() == fieldOrProperty);
if (fieldOrPropertyDecl == null)
{
break;
}
if (fieldOrPropertyDecl is FieldDeclaration fd)
{
fd.Variables.Single().Initializer = assignment.Right.Detach();
}
else if (fieldOrPropertyDecl is PropertyDeclaration pd)
{
pd.Initializer = assignment.Right.Detach();
}
else
{
break;
}
es.Remove();
}
if (staticCtor.Body.Statements.Count == 0)
{
staticCtor.Remove();
}
}
}
}
}
public ForStatement TransformFor(ExpressionStatement node)
{
Match m1 = variableAssignPattern.Match(node);
if (!m1.Success)
{
return(null);
}
var variable = m1.Get <IdentifierExpression>("variable").Single().GetILVariable();
AstNode next = node.NextSibling;
if (next is ForStatement forStatement && ForStatementUsesVariable(forStatement, variable))
{
node.Remove();
next.InsertChildAfter(null, node, ForStatement.InitializerRole);
return((ForStatement)next);
}
Match m3 = forPattern.Match(next);
if (!m3.Success)
{
return(null);
}
// ensure the variable in the for pattern is the same as in the declaration
if (variable != m3.Get <IdentifierExpression>("ident").Single().GetILVariable())
{
return(null);
}
WhileStatement loop = (WhileStatement)next;
node.Remove();
BlockStatement newBody = new BlockStatement();
foreach (Statement stmt in m3.Get <Statement>("statement"))
{
newBody.Add(stmt.Detach());
}
forStatement = new ForStatement();
forStatement.CopyAnnotationsFrom(loop);
forStatement.Initializers.Add(node);
forStatement.Condition = loop.Condition.Detach();
forStatement.Iterators.Add(m3.Get <Statement>("increment").Single().Detach());
forStatement.EmbeddedStatement = newBody;
loop.ReplaceWith(forStatement);
return(forStatement);
}
public LockStatement TransformLock(ExpressionStatement node)
{
Match m1 = lockFlagInitPattern.Match(node);
if (m1 == null)
{
return(null);
}
AstNode tryCatch = node.NextSibling;
Match m2 = lockTryCatchPattern.Match(tryCatch);
if (m2 == null)
{
return(null);
}
if (m1.Get <IdentifierExpression>("variable").Single().Identifier == m2.Get <IdentifierExpression>("flag").Single().Identifier)
{
Expression enter = m2.Get <Expression>("enter").Single();
IdentifierExpression exit = m2.Get <IdentifierExpression>("exit").Single();
if (exit.Match(enter) == null)
{
// If exit and enter are not the same, then enter must be "exit = ..."
AssignmentExpression assign = enter as AssignmentExpression;
if (assign == null)
{
return(null);
}
if (exit.Match(assign.Left) == null)
{
return(null);
}
enter = assign.Right;
// TODO: verify that 'obj' variable can be removed
}
// TODO: verify that 'flag' variable can be removed
// transform the code into a lock statement:
LockStatement l = new LockStatement();
l.Expression = enter.Detach();
l.EmbeddedStatement = ((TryCatchStatement)tryCatch).TryBlock.Detach();
((BlockStatement)l.EmbeddedStatement).Statements.First().Remove(); // Remove 'Enter()' call
tryCatch.ReplaceWith(l);
node.Remove(); // remove flag variable
return(l);
}
return(null);
}
public ForStatement TransformFor(ExpressionStatement node)
{
Match m1 = variableAssignPattern.Match(node);
if (m1 == null)
{
return(null);
}
AstNode next = node.NextSibling;
Match m2 = forPattern.Match(next);
if (m2 == null)
{
return(null);
}
// ensure the variable in the for pattern is the same as in the declaration
if (m1.Get <IdentifierExpression>("variable").Single().Identifier != m2.Get <IdentifierExpression>("ident").Single().Identifier)
{
return(null);
}
WhileStatement loop = (WhileStatement)next;
node.Remove();
BlockStatement newBody = new BlockStatement();
foreach (Statement stmt in m2.Get <Statement>("statement"))
{
newBody.Add(stmt.Detach());
}
ForStatement forStatement = new ForStatement();
forStatement.Initializers.Add(node);
forStatement.Condition = loop.Condition.Detach();
forStatement.Iterators.Add(m2.Get <Statement>("increment").Single().Detach());
forStatement.EmbeddedStatement = newBody;
loop.ReplaceWith(forStatement);
return(forStatement);
}
