private static void outputNumericalValueOutput(ControlFlowGraph graph, SyntaxNode node, HashSet <SyntaxNode> history, StringBuilder builder)
{
if (!history.Contains(node))
{
history.Add(node);
builder.AppendFormat(" {{ \"key\": \"{0}\",\n \"value\": ", location(node));
if (node is LocalDeclarationStatementSyntax || node is VariableDeclarationSyntax)
{
VariableDeclarationSyntax s;
if (node is LocalDeclarationStatementSyntax)
{
s = (node as LocalDeclarationStatementSyntax).Declaration;
}
else
{
s = node as VariableDeclarationSyntax;
}
builder.Append("{ \"type\": \"variable_declaration\", \"declarations\": [");
bool firstVar = true;
foreach (var v in s.Variables)
{
if (firstVar)
{
firstVar = false;
}
else
{
builder.Append(",");
}
builder.AppendFormat(" {{ \"identifier\": \"{0}\", \"initializer\": ", v.Identifier);
if (v.Initializer == null)
{
builder.Append("null");
}
else
{
outputNumericalValueOutput(v.Initializer.Value, builder);
}
builder.Append(" }");
}
builder.Append(" ] }");
}
else if (node is AssignmentExpressionSyntax || (node is ExpressionStatementSyntax && (node as ExpressionStatementSyntax).Expression is AssignmentExpressionSyntax))
{
AssignmentExpressionSyntax s;
if (node is AssignmentExpressionSyntax)
{
s = node as AssignmentExpressionSyntax;
}
else
{
s = (node as ExpressionStatementSyntax).Expression as AssignmentExpressionSyntax;
}
builder.AppendFormat("{{ \"type\": \"variable_assignment\", \"left\": \"{0}\", \"right\": ", s.Left);
outputNumericalValueOutput(s.Right, builder);
builder.Append(" }");
}
else if (node is BinaryExpressionSyntax)
{
builder.Append("{ \"type\": \"comparison\", \"left\": ");
var s = node as BinaryExpressionSyntax;
outputNumericalValueOutput(s.Left, builder);
builder.AppendFormat(", \"op\": \"{0}\", \"right\": ", s.OperatorToken);
outputNumericalValueOutput(s.Right, builder);
builder.Append(" }");
}
else
{
builder.Append("{ \"type\": \"other\" }");
}
builder.Append(",\n \"successors\": [");
bool firstSucc = true;
foreach (var succ in graph.GetSuccessorsB(node))
{
if (firstSucc)
{
firstSucc = false;
}
else
{
builder.Append(", ");
}
builder.AppendFormat("{{ \"key\": \"{0}\", \"value\": {1} }}", location(succ.Key), succ.Value);
}
builder.Append("] }");
foreach (var succ in graph.GetSuccessors(node))
{
if (!history.Contains(succ))
{
builder.Append(",\n");
}
outputNumericalValueOutput(graph, succ, history, builder);
}
}
}
private void analyze(ControlFlowGraph graph, SyntaxNode node, Dictionary <string, NumericalValue <int> > variables, Dictionary <SyntaxNode, Dictionary <string, NumericalValue <int> > > history)
{
#region Union usagesAfter with reachingDefinitions
if (history.ContainsKey(node))
{
bool anyChanged = false;
foreach (var pair in history[node])
{
if (variables.ContainsKey(pair.Key))
{
var i = variables[pair.Key];
string old = i.ToString();
//Console.WriteLine("{0} vs {1} and {2}", old, i, pair.Value);
i.UnionWith(pair.Value);
if (!old.Equals(i.ToString()))
{
anyChanged = true;
}
}
else
{
variables.Add(pair.Key, pair.Value.Clone());
anyChanged = true;
}
}
if (history[node].Count == 0 && variables.Count != 0)
{
anyChanged = true;
}
if (!anyChanged)
{
return;
}
else
{
var clone = new Dictionary <string, NumericalValue <int> >();
foreach (var v in variables)
{
clone.Add(v.Key, v.Value.Clone());
}
history[node] = clone;
}
}
else
{
var clone = new Dictionary <string, NumericalValue <int> >();
foreach (var v in variables)
{
clone.Add(v.Key, v.Value.Clone());
}
history.Add(node, clone);
}
#endregion
NumericalValue <int> rangeTrue = null;
NumericalValue <int> rangeFalse = null;
string rangeVar = null;
#region Process node
if (node is LocalDeclarationStatementSyntax || node is VariableDeclarationSyntax)
{
VariableDeclarationSyntax s;
if (node is LocalDeclarationStatementSyntax)
{
s = (node as LocalDeclarationStatementSyntax).Declaration;
}
else
{
s = node as VariableDeclarationSyntax;
}
foreach (var v in s.Variables)
{
if (v.Initializer != null)
{
if (v.Initializer.Value is LiteralExpressionSyntax)
{
var valS = (v.Initializer.Value as LiteralExpressionSyntax).Token.ValueText;
int valI;
if (int.TryParse(valS, out valI))
{
var valNV = new NumericalValue <int>(valI);
if (variables.ContainsKey(v.Identifier.ToString()))
{
variables[v.Identifier.ToString()].AssignValue(valNV);
}
else
{
variables.Add(v.Identifier.ToString(), valNV);
}
}
}
else if (v.Initializer.Value is IdentifierNameSyntax)
{
var valNV = variables[v.Initializer.Value.ToString()];
if (variables.ContainsKey(v.Identifier.ToString()))
{
variables[v.Identifier.ToString()].AssignValue(valNV);
}
else
{
variables.Add(v.Identifier.ToString(), valNV);
}
}
else
{
var valNV = new NumericalValue <int>(int.MinValue, Inclusivity.INCLUSIVE, int.MaxValue, Inclusivity.INCLUSIVE);
if (variables.ContainsKey(v.Identifier.ToString()))
{
variables[v.Identifier.ToString()].AssignValue(valNV);
}
else
{
variables.Add(v.Identifier.ToString(), valNV);
}
}
}
}
}
else if (node is ExpressionStatementSyntax && (node as ExpressionStatementSyntax).Expression is AssignmentExpressionSyntax)
{
var s = (node as ExpressionStatementSyntax).Expression as AssignmentExpressionSyntax;
if (s.Right is LiteralExpressionSyntax)
{
var valS = (s.Right as LiteralExpressionSyntax).Token.ValueText;
int valI;
if (int.TryParse(valS, out valI))
{
var valNV = new NumericalValue <int>(valI);
if (variables.ContainsKey(s.Left.ToString()))
{
variables[s.Left.ToString()].AssignValue(valNV);
}
else
{
variables.Add(s.Left.ToString(), valNV);
}
}
}
else if (s.Right is IdentifierNameSyntax)
{
var valNV = variables[s.Right.ToString()];
if (variables.ContainsKey(s.Left.ToString()))
{
variables[s.Left.ToString()].AssignValue(valNV);
}
else
{
variables.Add(s.Left.ToString(), valNV);
}
}
else
{
var valNV = new NumericalValue <int>(int.MinValue, Inclusivity.INCLUSIVE, int.MaxValue, Inclusivity.INCLUSIVE);
if (variables.ContainsKey(s.Left.ToString()))
{
variables[s.Left.ToString()].AssignValue(valNV);
}
else
{
variables.Add(s.Left.ToString(), valNV);
}
}
}
else if (node is BinaryExpressionSyntax)
{
var n = node as BinaryExpressionSyntax;
if (n.Right is LiteralExpressionSyntax)
{
int value;
if (int.TryParse((n.Right as LiteralExpressionSyntax).Token.ValueText, out value))
{
if (n.OperatorToken.ToString().Equals("<"))
{
rangeTrue = new NumericalValue <int>(int.MinValue, Inclusivity.INCLUSIVE, value, Inclusivity.EXCLUSIVE);
rangeFalse = new NumericalValue <int>(value, Inclusivity.INCLUSIVE, int.MaxValue, Inclusivity.INCLUSIVE);
rangeVar = n.Left.ToString();
}
if (n.OperatorToken.ToString().Equals("<="))
{
rangeTrue = new NumericalValue <int>(int.MinValue, Inclusivity.INCLUSIVE, value, Inclusivity.INCLUSIVE);
rangeFalse = new NumericalValue <int>(value, Inclusivity.EXCLUSIVE, int.MaxValue, Inclusivity.INCLUSIVE);
rangeVar = n.Left.ToString();
}
if (n.OperatorToken.ToString().Equals(">"))
{
rangeTrue = new NumericalValue <int>(value, Inclusivity.EXCLUSIVE, int.MaxValue, Inclusivity.INCLUSIVE);
rangeFalse = new NumericalValue <int>(int.MinValue, Inclusivity.INCLUSIVE, value, Inclusivity.INCLUSIVE);
rangeVar = n.Left.ToString();
}
if (n.OperatorToken.ToString().Equals(">="))
{
rangeTrue = new NumericalValue <int>(value, Inclusivity.INCLUSIVE, int.MaxValue, Inclusivity.INCLUSIVE);
rangeFalse = new NumericalValue <int>(int.MinValue, Inclusivity.INCLUSIVE, value, Inclusivity.EXCLUSIVE);
rangeVar = n.Left.ToString();
}
}
}
}
if (debug)
{
Console.WriteLine("({0}): {1} {2}", node.GetLocation().GetLineSpan().StartLinePosition, node, node.GetType());
foreach (var pair in variables)
{
Console.WriteLine(" {0} -> {1}", pair.Key, pair.Value);
}
}
#endregion
#region Recurse
foreach (var succ in graph.GetSuccessorsB(node))
{
var variablesPrime = new Dictionary <string, NumericalValue <int> >();
foreach (var v in variables)
{
variablesPrime.Add(v.Key, v.Value.Clone());
}
if (succ.Value == 0)
{
variablesPrime[rangeVar].IntersectWith(rangeFalse);
}
else if (succ.Value == 1)
{
variablesPrime[rangeVar].IntersectWith(rangeTrue);
}
analyze(graph, succ.Key, variablesPrime, history);
}
#endregion
}
static void Main(string[] args)
{
/*{
* var n = new NumericalValue<int>();
* n.UnionWith(new NumericalValue<int>(0, Inclusivity.INCLUSIVE, 3, Inclusivity.INCLUSIVE));
* AssertEquals(n.ToString(), "[0, 3]");
* n.UnionWith(new NumericalValue<int>(0, Inclusivity.INCLUSIVE, 3, Inclusivity.INCLUSIVE));
* AssertEquals(n.ToString(), "[0, 3]");
* n.UnionWith(new NumericalValue<int>(1, Inclusivity.INCLUSIVE, 4, Inclusivity.EXCLUSIVE));
* AssertEquals(n.ToString(), "[0, 4)");
* n.UnionWith(new NumericalValue<int>(7, Inclusivity.INCLUSIVE, 10, Inclusivity.INCLUSIVE));
* AssertEquals(n.ToString(), "[0, 4) U [7, 10]");
* n.UnionWith(new NumericalValue<int>(6, Inclusivity.INCLUSIVE, 7, Inclusivity.EXCLUSIVE));
* AssertEquals(n.ToString(), "[0, 4) U [6, 10]");
* n.UnionWith(new NumericalValue<int>(3, Inclusivity.INCLUSIVE, 7, Inclusivity.EXCLUSIVE));
* AssertEquals(n.ToString(), "[0, 10]");
* }
* {
* var n = new NumericalValue<int>();
* n.UnionWith(new NumericalValue<int>(0, Inclusivity.INCLUSIVE, 4, Inclusivity.EXCLUSIVE));
* n.UnionWith(new NumericalValue<int>(6, Inclusivity.INCLUSIVE, 10, Inclusivity.INCLUSIVE));
* n.UnionWith(new NumericalValue<int>(-2, Inclusivity.INCLUSIVE, -2, Inclusivity.INCLUSIVE));
* n.UnionWith(new NumericalValue<int>(14, Inclusivity.EXCLUSIVE, 15, Inclusivity.EXCLUSIVE));
* AssertEquals(n.ToString(), "[-2, -2] U [0, 4) U [6, 10] U (14, 15)");
* n.IntersectWith(3, Inclusivity.INCLUSIVE, 6, Inclusivity.INCLUSIVE);
* AssertEquals(n.ToString(), "[3, 4) U [6, 6]");
* }*/
SyntaxTree tree = CSharpSyntaxTree.ParseText(
@"using System;
using System.Collections;
using System.Linq;
using System.Text;
namespace HelloWorld
{
class ProgramUnderTest
{
static void Main(string[] args) {}
int f() { return 4; }
private void Test() {
int j = 3;
for (int i = 0; i < 10; i = i + 1) {
if (i > j) { j = i + 1; }
}
return;
/*
int i = 0;
i = 3;
int j = f();
if (j + 3 > 5) {
i = j;
} else {
i = -1;
}
return;*/
}
}
}");
var diagnostics = new List <NumericValueDiagnostic>();
var compilation = CompileCode(tree);
var model = compilation.GetSemanticModel(tree);
foreach (var c in tree.GetRoot().DescendantNodes().OfType <ClassDeclarationSyntax>())
{
foreach (var m in c.DescendantNodes().OfType <MethodDeclarationSyntax>())
{
if (m.Identifier.ToString().Equals("Test"))
{
ControlFlowGraph controlFlowGraph = new ControlFlowGraph(m, model);
Console.WriteLine("digraph {0} {{", "Test");
HashSet <SyntaxNode> visitedNodes = new HashSet <SyntaxNode>();
printGraphViz(controlFlowGraph, controlFlowGraph.GetEntryPoint(), visitedNodes);
Console.WriteLine();
foreach (var node in visitedNodes)
{
if (node.GetLocation().ToString().Contains("[0..7)"))
{
Console.WriteLine("\"{0}\" [color=\"#55AAFF\"];", node.GetLocation().ToString());
}
Console.WriteLine("\"{0}\" [label=\"{1}\"];", node.GetLocation().ToString(), interpolateLabel(node.ToFullString()));
}
Console.WriteLine("}");
Console.Write("\n\n\n");
/*NumericalValueAnalysis numericalValueAnalysis = new NumericalValueAnalysis(controlFlowGraph);*/
StringBuilder builder = new StringBuilder();
builder.Append("{ \"nodes\": [\n");
outputNumericalValueOutput(controlFlowGraph, controlFlowGraph.GetEntryPoint(), new HashSet <SyntaxNode>(), builder);
builder.Append("\n] }");
Console.WriteLine("Builder: '\n{0}\n'", builder);
System.IO.File.WriteAllText("input_code.json", builder.ToString());
var process = new System.Diagnostics.Process();
process.StartInfo.FileName = "numerical_value.exe";
process.StartInfo.Arguments = "input_code.json diagnostics.json";
process.StartInfo.CreateNoWindow = true;
process.Start();
process.WaitForExit();
diagnostics.AddRange(Newtonsoft.Json.JsonConvert.DeserializeObject <List <NumericValueDiagnostic> >(System.IO.File.ReadAllText("diagnostics.json")));
foreach (var diagnostic in diagnostics)
{
Console.WriteLine("{0}: This is always {1}", diagnostic.location, diagnostic.always_true);
}
}
}
}
Console.WriteLine();
Console.Write("Press enter to continue...");
Console.ReadLine();
}
public NumericalValueAnalysis(ControlFlowGraph graph)
{
analyze(graph, graph.GetEntryPoint(), new Dictionary <string, NumericalValue <int> >(), new Dictionary <SyntaxNode, Dictionary <string, NumericalValue <int> > >());
}