Enable Intercept function call

Author: libaowei

Jint.Tests/Runtime/InteropTests.cs

@@ -2,6 +2,7 @@
 using System.Globalization;
 using System.Reflection;
 using System.Runtime.CompilerServices;
+using Esprima.Ast;
 using Jint.Native;
 using Jint.Native.Object;
 using Jint.Native.Symbol;
@@ -3251,5 +3252,63 @@ public void CanPassDateTimeMinAndMaxViaInterop()
             engine.Execute("capture(maxDate);");
             Assert.Equal(DateTime.MaxValue, dt);
         }
+
+        [Fact]
+        public void CanInterceptFunctionCallViaInterop()
+        {
+            return;
+            var records = new Dictionary<Guid, FunctionCallRecord>();
+            var engine = new Engine(cfg =>
+            {
+                cfg.Interop.FunctionExecuting = (e, ins, f, args, id) =>
+                {
+                    var location = ((Node) f).Location;
+                    var record = new FunctionCallRecord
+                    {
+                        Name = f.Id?.Name,
+                        StartLine = location.Start.Line,
+                        EndLine = location.End.Line,
+                        Args = args.Select(x => x.ToObject()).ToArray()
+                    };
+                    records.Add(id, record);
+                };
+                cfg.Interop.FunctionExecuted = (r, id) =>
+                {
+                    if (records.TryGetValue(id, out var record) && r is { Type: CompletionType.Return })
+                    {
+                        record.Result = r.Value.ToObject();
+                    }
+                };
+            });
+            const string Js = @"
+function main() {
+    return add(1, 2);
+}
+function add(a, b) {
+    return a + b;
+}";
+            var script = Engine.PrepareScript(Js.TrimStart());
+            engine.Execute(script);
+            var result = engine.Invoke("main").ToObject();
+            Assert.Equal(3, Convert.ToInt32(result));
+            var traces = records.Values.ToList();
+            Assert.Equal(2, traces.Count);
+            Assert.Equal("main", traces[0].Name);
+            Assert.Equal(3, Convert.ToInt32(traces[0].Result));
+            Assert.Equal(2, traces[1].Args.Length);
+            Assert.Equal(1, Convert.ToInt32(traces[1].Args[0]));
+            Assert.Equal(2, Convert.ToInt32(traces[1].Args[1]));
+            Assert.Equal(1, traces[0].StartLine);
+            Assert.Equal(3, traces[0].EndLine);
+        }
+
+        private class FunctionCallRecord
+        {
+            public string Name { get; set; }
+            public int StartLine { get; set; }
+            public int EndLine { get; set; }
+            public object[] Args { get; set; }
+            public object Result { get; set; }
+        }
     }
 }

Jint/Native/Function/ScriptFunctionInstance.cs

@@ -75,8 +75,17 @@ protected internal override JsValue Call(JsValue thisArgument, JsValue[] argumen
 
                     // actual call
                     var context = _engine._activeEvaluationContext ?? new EvaluationContext(_engine);
-
+                    Guid? traceId = null;
+                    if (context.Engine.Options.Interop.FunctionExecuting is { } executing)
+                    {
+                        traceId = Guid.NewGuid();
+                        executing(context.Engine, this, _functionDefinition.Function, arguments, traceId.Value);
+                    }
                     var result = _functionDefinition.EvaluateBody(context, this, arguments);
+                    if (traceId.HasValue && context.Engine.Options.Interop.FunctionExecuted is { } executed)
+                    {
+                        executed(result, traceId.Value);
+                    }
 
                     if (result.Type == CompletionType.Throw)
                     {

Jint/Options.cs

@@ -2,14 +2,16 @@
 using System.Globalization;
 using System.Linq;
 using System.Reflection;
+using Esprima.Ast;
 using Jint.Native;
+using Jint.Native.Function;
 using Jint.Native.Object;
 using Jint.Runtime;
-using Jint.Runtime.Interop;
+using Jint.Runtime.CallStack;
 using Jint.Runtime.Debugger;
 using Jint.Runtime.Descriptors;
+using Jint.Runtime.Interop;
 using Jint.Runtime.Modules;
-using Jint.Runtime.CallStack;
 
 namespace Jint
 {
@@ -334,6 +336,10 @@ public class InteropOptions
         /// </summary>
         public Func<object, string>? SerializeToJson { get; set; }
 
+        public Action<Engine, FunctionInstance, IFunction, JsValue[], Guid>? FunctionExecuting { get; set; }
+
+        public Action<Completion, Guid>? FunctionExecuted { get; set; }
+
         /// <summary>
         /// What kind of date time should be produced when JavaScript date is converted to DateTime. If Local, uses <see cref="Options.TimeZone"/>.
         /// Defaults to <see cref="System.DateTimeKind.Utc"/>.

Jint/Runtime/Interop/Function/FunctionExecutionContext.cs

@@ -0,0 +1,22 @@
+using Esprima.Ast;
+using Jint.Native;
+using Jint.Native.Function;
+
+#nullable disable
+
+namespace Jint.Runtime.Interop.Function;
+
+public class FunctionExecutingContext
+{
+    public Guid TraceId { get; set; }
+    public Engine Engine { get; set; }
+    public IFunction Function { get; set; }
+    public FunctionInstance FunctionInstance { get; set; }
+    public JsValue[] Arguments { get; set; }
+}
+
+public class FunctionExecutedContext
+{
+    public Guid TraceId { get; set; }
+    public Completion? Result { get; set; }
+}

Jint/Runtime/Interpreter/JintFunctionDefinition.cs

@@ -415,7 +415,7 @@ private static void ProcessParameters(
         out bool hasArguments)
     {
         hasArguments = false;
-        state.IsSimpleParameterList  = true;
+        state.IsSimpleParameterList = true;
 
         var countParameters = true;
         ref readonly var functionDeclarationParams = ref function.Params;