3

我找不到使用 Roslyn 为 c# 代码构建控制流图的方法。

我知道 Roslyn 编译器中有一个名为“Microsoft.CodeAnalysis.FlowAnalysis”的命名空间，其中包含一些用于创建控制流图的类，但我不知道如何使用它。

https://docs.microsoft.com/en-us/dotnet/api/microsoft.codeanalysis.flowanalysis?view=roslyn-dotnet

有一个名为 ControlFlowGraph.cs 的类，但问题是我无法从该类创建对象或子类。 https://docs.microsoft.com/en-us/dotnet/api/microsoft.codeanalysis.flowanalysis.controlflowgraph?view=roslyn-dotnet

如果有人知道如何使用这个命名空间来构建控制流图或者有一个例子可以使用，请。谢谢你

4

2 回答 2

4

我已经设法从方法节点创建 CFG：

CSharpParseOptions options = CSharpParseOptions.Default
    .WithFeatures(new[] { new KeyValuePair<string, string>("flow-analysis", "")     
});

MSBuildWorkspace workspace = MSBuildWorkspace.Create();
Solution solution = workspace.OpenSolutionAsync(solutionUrl).Result; // path to your SLN file

ProjectDependencyGraph projectGraph = solution.GetProjectDependencyGraph();
Dictionary<string, Stream> assemblies = new Dictionary<string, Stream>();

var projects = projectGraph.GetTopologicallySortedProjects().ToDictionary(
    p => p,
    p => solution.GetProject(p).Name);

var bllProjectId = projects.First(p => p.Value == "<your project name>").Key; // choose project for analysis
var projectId = bllProjectId;
solution = solution.WithProjectParseOptions(projectId, options);

Compilation compilation = solution.GetProject(projectId).GetCompilationAsync().Result;
if (compilation != null && !string.IsNullOrEmpty(compilation.AssemblyName))
{
    var syntaxTree = compilation.SyntaxTrees.First();

    // get syntax nodes for methods
    var methodNodes = from methodDeclaration in syntaxTree.GetRoot().DescendantNodes()
            .Where(x => x is MethodDeclarationSyntax)
        select methodDeclaration;

    foreach (MethodDeclarationSyntax node in methodNodes)
    {
        var model = compilation.GetSemanticModel(node.SyntaxTree);
        node.Identifier.ToString().Dump();
        if (node.SyntaxTree.Options.Features.Any())
        {
            var graph = ControlFlowGraph.Create(node, model); // CFG is here
        }
        else
        {
            // "No features".Dump();
        }
    }
}

下一步将是分析CFG ...

卡雷尔

于 2019-02-06T10:40:08.447 回答
1

根据 Karel 的回答和评论，这是创建没有错误的控制流图的方法：

var source = @"
class C
{
    int M(int x)
    {
      x = 0;
      int y = x * 3;
      return y;
    }
}";

        CSharpParseOptions options = CSharpParseOptions.Default
       .WithFeatures(new[] { new KeyValuePair<string, string>("flow-analysis", "")});

        var tree = CSharpSyntaxTree.ParseText(source, options);
        var compilation = CSharpCompilation.Create("c", new[] { tree });
        var model = compilation.GetSemanticModel(tree, ignoreAccessibility: true);

        var methodBodySyntax = tree.GetCompilationUnitRoot().DescendantNodes().OfType<BaseMethodDeclarationSyntax>().Last();

        var cfgFromSyntax = ControlFlowGraph.Create(methodBodySyntax, model);
于 2019-02-15T15:46:30.390 回答