public FieldAccessExpression(IFieldSymbol fieldSymbol, SyntaxNode node, UcfgExpression target)
: base(fieldSymbol, node, target)
{
var fieldAccess = new FieldAccess {
Field = new Variable {
Name = fieldSymbol.Name
}
};
switch (Target)
{
case ThisExpression thisExpression:
fieldAccess.This = Target.Expression.This;
break;
case VariableExpression variableExpression:
fieldAccess.Object = Target.Expression.Var;
break;
case ClassNameExpression classNameExpression:
fieldAccess.Classname = Target.Expression.Classname;
break;
default:
throw new UcfgException("Expecting target object to be 'This', 'Variable' or 'ClassName' but " +
$"got '{Target}'. " +
$"Node: {node} " +
$"File: {node.GetLocation()?.GetLineSpan().Path ?? "{unknown}"} " +
$"Line: {node.GetLocation()?.GetLineSpan().StartLinePosition}");
}
Expression = new Expression {
FieldAccess = fieldAccess
};
}
public UcfgExpression Create(SyntaxNode node, ISymbol symbol, UcfgExpression targetExpression)
{
switch (symbol)
{
case null:
return(UcfgExpression.Unknown);
case IParameterSymbol parameterSymbol:
return(parameterSymbol.Type.IsAny(UnsupportedVariableTypes)
? (UcfgExpression) new UcfgExpression.ConstantExpression(parameterSymbol)
: new UcfgExpression.VariableExpression(parameterSymbol, node));
case ILocalSymbol localSymbol:
return(new UcfgExpression.VariableExpression(symbol, node));
case IFieldSymbol fieldSymbol:
return(new UcfgExpression.FieldAccessExpression(fieldSymbol, node, targetExpression));
case IPropertySymbol propertySymbol:
return(new UcfgExpression.PropertyAccessExpression(propertySymbol, node, targetExpression));
case INamedTypeSymbol namedTypeSymbol:
return(CreateClassName(namedTypeSymbol));
case IMethodSymbol methodSymbol:
return(new UcfgExpression.MethodAccessExpression(methodSymbol, node, targetExpression));
default:
throw new UcfgException($"Create UcfgExpression does not expect symbol of type '{symbol.GetType().Name}'.");
}
}
private IEnumerable <Instruction> ProcessInvocationExpression(InvocationExpressionSyntax invocationSyntax)
{
var methodSymbol = GetSymbol <IMethodSymbol>(invocationSyntax);
if (methodSymbol == null)
{
expressionService.Associate(invocationSyntax, expressionService.CreateConstant());
return(NoInstructions);
}
var invocationExpression = expressionService.GetExpression(invocationSyntax.Expression);
var methodExpression = invocationExpression as UcfgExpression.MethodAccessExpression;
if (methodExpression == null)
{
expressionService.Associate(invocationSyntax, expressionService.CreateConstant(invocationExpression.TypeSymbol));
return(NoInstructions);
}
UcfgExpression targetExpression;
UcfgExpression memberAccessArgument = null;
if (IsCalledAsExtension(methodSymbol))
{
if (invocationSyntax.Expression is MemberAccessExpressionSyntax memberAccessExpression)
{
// First argument is the class name (static method call)
targetExpression = expressionService.CreateClassName(methodSymbol.ContainingType);
// Second argument is the left side of the invocation
memberAccessArgument = expressionService.GetExpression(memberAccessExpression.Expression);
}
else
{
throw new UcfgException("Unexpected state, method called as extension of a member but there is no " +
"member access available.");
}
}
else
{
targetExpression = methodExpression.Target;
}
var additionalArguments = new List <UcfgExpression>();
if (memberAccessArgument != null)
{
additionalArguments.Add(memberAccessArgument);
}
additionalArguments.AddRange(GetAdditionalArguments(invocationSyntax.ArgumentList));
return(CreateMethodCall(invocationSyntax, methodSymbol, targetExpression, additionalArguments.ToArray()));
}
private IEnumerable <Instruction> CreateFunctionCall(string methodIdentifier, SyntaxNode syntaxNode,
UcfgExpression assignedTo, params UcfgExpression[] arguments)
{
if (syntaxNode is ObjectCreationExpressionSyntax)
{
throw new UcfgException("Expecting this method not to be called for nodes of type 'ObjectCreationExpressionSyntax'.");
}
if (arguments.Length == 0 &&
methodIdentifier != UcfgBuiltInMethodId.EntryPoint)
{
throw new UcfgException($"Every UCFG expression except {UcfgBuiltInMethodId.EntryPoint} must have at least " +
"one argument. " +
$"Identifier: {methodIdentifier}, " +
$"File: {syntaxNode.GetLocation()?.GetLineSpan().Path ?? "{unknown}" } " +
$"Line: {syntaxNode.GetLocation()?.GetLineSpan().StartLinePosition}");
}
expressionService.Associate(syntaxNode, assignedTo);
var instruction = new Instruction
{
Assigncall = new AssignCall
{
Location = syntaxNode.GetUcfgLocation(),
MethodId = methodIdentifier
}
};
IList <Instruction> newInstructions = new List <Instruction>();
if (methodIdentifier == UcfgBuiltInMethodId.Identity)
{
instruction.Assigncall.Args.AddRange(arguments.Select(a => a.Expression));
}
else
{
var processedArgs = ProcessInstructionArguments(arguments, newInstructions);
instruction.Assigncall.Args.AddRange(processedArgs);
}
assignedTo.ApplyAsTarget(instruction);
newInstructions.Add(instruction);
return(newInstructions);
}
private IEnumerable <Instruction> CreateNewObject(ObjectCreationExpressionSyntax syntaxNode,
IMethodSymbol ctorSymbol, UcfgExpression callTarget)
{
expressionService.Associate(syntaxNode, callTarget);
var instruction = new Instruction
{
NewObject = new NewObject
{
Location = syntaxNode.GetUcfgLocation(),
Type = expressionService.CreateClassName(ctorSymbol.ContainingType).Expression.Classname.Classname
}
};
callTarget.ApplyAsTarget(instruction);
return(new[] { instruction });
}
private IEnumerable <Instruction> ProcessGenericName(GenericNameSyntax genericName)
{
var namedTypeSymbol = GetSymbol <INamedTypeSymbol>(genericName);
UcfgExpression target = null;
if (namedTypeSymbol != null)
{
target = namedTypeSymbol.IsStatic
? expressionService.CreateClassName(namedTypeSymbol)
: UcfgExpression.This;
}
var ucfgExpression = expressionService.Create(genericName, namedTypeSymbol, target);
expressionService.Associate(genericName, ucfgExpression);
return(NoInstructions);
}
public ElementAccessExpression(ISymbol symbol, UcfgExpression target)
: base(symbol, null, target)
{
}
private static bool IsTemporaryVariableRequired(UcfgExpression methodArgumentExpression)
{
return(methodArgumentExpression is UcfgExpression.FieldAccessExpression);
}
public IEnumerable <Instruction> CreateArraySetCall(SyntaxNode syntaxNode, ITypeSymbol nodeTypeSymbol,
UcfgExpression target, UcfgExpression value)
{
return(CreateFunctionCall(UcfgBuiltInMethodId.ArraySet, syntaxNode, expressionService.CreateVariable(nodeTypeSymbol),
target, value));
}
private IEnumerable <Instruction> CreateMethodCall(SyntaxNode syntaxNode, IMethodSymbol methodSymbol, UcfgExpression target,
params UcfgExpression[] additionalArguments)
{
if (target is UcfgExpression.ConstantExpression)
{
expressionService.Associate(syntaxNode, target);
return(NoInstructions);
}
return(CreateFunctionCall(methodSymbol.ToUcfgMethodId(), syntaxNode,
expressionService.CreateVariable(methodSymbol.ReturnType), new[] { target }.Concat(additionalArguments).ToArray()));
}
public IEnumerable <Instruction> CreateIdCall(SyntaxNode syntaxNode, UcfgExpression to, UcfgExpression value)
{
return(CreateFunctionCall(UcfgBuiltInMethodId.Identity, syntaxNode, to, value));
}
public IEnumerable <Instruction> CreateAnnotationCall(SyntaxNode syntaxNode, UcfgExpression.VariableExpression to, UcfgExpression value)
{
return(CreateFunctionCall(UcfgBuiltInMethodId.Annotation, syntaxNode, to, value));
}
public IEnumerable <Instruction> CreateConcatCall(SyntaxNode syntaxNode, ITypeSymbol nodeTypeSymbol, UcfgExpression left,
UcfgExpression right)
{
return(CreateFunctionCall(UcfgBuiltInMethodId.Concatenation, syntaxNode,
expressionService.CreateVariable(nodeTypeSymbol), left, right));
}
public PropertyAccessExpression(IPropertySymbol propertySymbol, SyntaxNode node, UcfgExpression target)
: base(propertySymbol, node, target)
{
GetMethodSymbol = propertySymbol.GetMethod;
SetMethodSymbol = propertySymbol.SetMethod;
}
public MethodAccessExpression(IMethodSymbol methodSymbol, SyntaxNode node, UcfgExpression target)
: base(methodSymbol, node, target)
{
}
public void Associate(SyntaxNode syntaxNode, UcfgExpression expression) => cache[syntaxNode.RemoveParentheses()] = expression;
public UcfgExpression CreateArrayAccess(ISymbol symbol, UcfgExpression targetExpression) => new UcfgExpression.ElementAccessExpression(symbol, targetExpression);
private IEnumerable <Instruction> CreateNewArray(ArrayCreationExpressionSyntax syntaxNode,
IArrayTypeSymbol arrayTypeSymbol, UcfgExpression callTarget)
{
expressionService.Associate(syntaxNode, callTarget);
var instruction = new Instruction
{
NewObject = new NewObject
{
Location = syntaxNode.GetUcfgLocation(),
Type = arrayTypeSymbol.ToDisplayString()
}
};
callTarget.ApplyAsTarget(instruction);
return(new[] { instruction });
}
public MemberAccessExpression(ISymbol symbol, SyntaxNode node, UcfgExpression target)
: base(symbol, node)
{
Target = target;
}