private static Delegate CreateMethod(Type delegateType, Type returnType, Type[] parameterTypes, params Expression[] expressions)
{
var method = new DynamicMethod("testMethod", returnType, parameterTypes, typeof(BuilderTestBase), true);
var builder = new MethodBodyBuilder(method, parameterTypes).AddStatements(expressions);
Console.WriteLine(builder);
builder.Compile();
return(method.CreateDelegate(delegateType));
}
static void Main(string[] args)
{
var asmName = "PlayGround.Generated";
var fileName = "PlayGround.Generated.dll";
var asmBuilder = AppDomain.CurrentDomain.DefineDynamicAssembly(new AssemblyName(asmName), AssemblyBuilderAccess.RunAndSave);
var modBuilder = asmBuilder.DefineDynamicModule(asmName, fileName, true);
var typeBuilder = modBuilder.DefineType("PlayGround.Generated.MyClass", TypeAttributes.Class | TypeAttributes.Public);
var fieldBuilder = typeBuilder.DefineField("field", typeof(string), FieldAttributes.InitOnly | FieldAttributes.Static | FieldAttributes.Public);
var cb = typeBuilder.DefineTypeInitializer();
var builder = new MethodBodyBuilder(cb);
builder.AddStatements(
Expr.WriteField(fieldBuilder, Expr.Constant("abc")),
Expr.Call(typeof(Console).GetMethod("WriteLine", new[] { typeof(string) }), Expr.Constant("Hello my friend!")),
Expr.Call(typeof(Console).GetMethod("WriteLine", new[] { typeof(string), typeof(object) }), Expr.Constant("What a {0} day!"), Expr.Constant("beautiful")),
Expr.Call(typeof(Console).GetMethod("ReadKey", new Type[0])));
Console.WriteLine(builder.ToString());
builder.Compile();
var mb = typeBuilder.DefineMethod("foo", MethodAttributes.Public);
mb.SetReturnType(typeof(string));
mb.SetParameters(typeof(int));
mb.DefineParameter(1, ParameterAttributes.None, "val");
builder = new MethodBodyBuilder(mb, typeof(int));
builder.AddStatements(
Expr.IfThen(Expr.Parameter(1, typeof(int)), Expr.Call(typeof(Console).GetMethod("WriteLine", new[] { typeof(string) }), Expr.Constant("aha!"))),
Expr.Return(Expr.Call(
Expr.Call(
Expr.New(typeof(StringBuilder)),
typeof(StringBuilder).GetMethod("AppendFormat", new[] { typeof(string), typeof(object), typeof(object) }),
Expr.Constant("{0}_{1}"),
Expr.ReadField(fieldBuilder),
Expr.Convert(Expr.Parameter(1, typeof(int)), typeof(object))),
typeof(StringBuilder).GetMethod("ToString", new Type[0]))));
Console.WriteLine(builder.ToString());
builder.Compile();
mb = typeBuilder.DefineMethod("bar", MethodAttributes.Public);
mb.SetReturnType(typeof(string));
mb.SetParameters(typeof(string));
mb.DefineParameter(1, ParameterAttributes.None, "text");
builder = new MethodBodyBuilder(mb, typeof(string));
builder.AddStatements(
Expr.Return(
Expr.Call(typeof(string).GetMethod("Format", new[] { typeof(string), typeof(object), typeof(object) }), Expr.Constant("Result: {0}-{1}"),
Expr.IfThenElse(
Expr.Parameter(1, typeof(string)),
Expr.Call(typeof(string).GetMethod("Format", new[] { typeof(string), typeof(object) }), Expr.Constant("Date: {0}"), Expr.Convert(Expr.Parameter(1, typeof(string)), typeof(object))),
Expr.Constant("Undefined!")),
Expr.Convert(Expr.Convert(Expr.Convert(Expr.Constant(16), typeof(object)), typeof(int)), typeof(object)))
));
Console.WriteLine(builder.ToString());
builder.Compile();
mb = typeBuilder.DefineMethod("tryFinally", MethodAttributes.Public);
mb.SetParameters(typeof(string));
mb.SetReturnType(typeof(void));
mb.DefineParameter(1, ParameterAttributes.None, "value");
builder = new MethodBodyBuilder(mb, typeof(string));
builder.AddStatements(
Expr.TryFinally(
Expr.IfThenElse(Expr.Parameter(1, typeof(string)),
Expr.Call(typeof(Console).GetMethod("WriteLine", new[] { typeof(string) }), Expr.Parameter(1, typeof(string))),
Expr.Throw(Expr.New(typeof(Exception), Expr.Constant("No string provided!")))),
Expr.Call(typeof(Console).GetMethod("WriteLine", new[] { typeof(string) }), Expr.Constant("finally!")))
);
Console.WriteLine(builder.ToString());
builder.Compile();
mb = typeBuilder.DefineMethod("tryCatchFinally", MethodAttributes.Public);
mb.SetParameters(typeof(string));
mb.SetReturnType(typeof(void));
mb.DefineParameter(1, ParameterAttributes.None, "value");
builder = new MethodBodyBuilder(mb, typeof(string));
var loc1 = Expr.LocalVariable(typeof(Exception), "e");
builder.AddStatements(
Expr.TryCatchFinally(
Expr.IfThenElse(Expr.Parameter(1, typeof(string)),
Expr.Call(typeof(Console).GetMethod("WriteLine", new[] { typeof(string) }), Expr.Parameter(1, typeof(string))),
Expr.Throw(Expr.New(typeof(ArgumentNullException), Expr.Constant("No string provided!")))),
Expr.Call(typeof(Console).GetMethod("WriteLine", new[] { typeof(string) }), Expr.Constant("finally!")),
new CatchBlock(typeof(ArgumentNullException), loc1, Expr.Rethrow())
));
Console.WriteLine(builder.ToString());
builder.Compile();
mb = typeBuilder.DefineMethod("localVar", MethodAttributes.Public);
mb.SetReturnType(typeof(void));
var var1 = Expr.LocalVariable(typeof(string), "o");
var var2 = Expr.LocalVariable(typeof(int), "i");
builder = new MethodBodyBuilder(mb, typeof(string));
builder.AddStatements(
Expr.DeclareLocal(var1, Expr.Constant("High {0}!")),
Expr.DeclareLocal(var2, Expr.Constant(5)),
Expr.Call(typeof(Console).GetMethod("WriteLine", new[] { typeof(string), typeof(object) }), Expr.ReadLocal(var1), Expr.Convert(Expr.ReadLocal(var2), typeof(object))));
Console.WriteLine(builder.ToString());
builder.Compile();
mb = typeBuilder.DefineMethod("negNot", MethodAttributes.Public);
mb.SetReturnType(typeof(int));
mb.SetParameters(typeof(byte));
builder = new MethodBodyBuilder(mb, typeof(byte));
builder.AddStatements(Expr.Return(Expr.Not(Expr.Negate(Expr.Parameter(1, typeof(byte))))));
Console.WriteLine(builder.ToString());
builder.Compile();
mb = typeBuilder.DefineMethod("loop", MethodAttributes.Public);
mb.SetReturnType(typeof(void));
var iVar = Expr.LocalVariable(typeof(int), "i");
builder = new MethodBodyBuilder(mb);
builder.AddStatements(
Expr.DeclareLocal(iVar, Expr.Constant(10)),
Expr.Loop(Expr.IfThenElse(
Expr.ReadLocal(iVar),
Expr.Block(
Expr.WriteLocal(iVar, Expr.Add(Expr.ReadLocal(iVar), Expr.Constant(-1))),
Expr.Call(typeof(Console).GetMethod("WriteLine", new[] { typeof(string) }), Expr.Constant("loop!..."))),
Expr.LoopBreak()))
);
Console.WriteLine(builder.ToString());
builder.Compile();
mb = typeBuilder.DefineMethod("conv", MethodAttributes.Public);
mb.SetReturnType(typeof(ulong));
builder = new MethodBodyBuilder(mb);
builder.AddStatements(Expr.Return(Expr.Convert(Expr.Constant(-1), typeof(ulong))));
Console.WriteLine(builder.ToString());
builder.Compile();
mb = typeBuilder.DefineMethod("intTS", MethodAttributes.Public);
mb.SetReturnType(typeof(string));
builder = new MethodBodyBuilder(mb);
builder.AddStatements(Expr.Return(Expr.Call(Expr.Constant(21), typeof(int).GetMethod("ToString", new Type[0]))));
Console.WriteLine(builder.ToString());
builder.Compile();
mb = typeBuilder.DefineMethod("loadStructField", MethodAttributes.Public);
mb.SetParameters(typeof(MyStruct));
mb.SetReturnType(typeof(string));
builder = new MethodBodyBuilder(mb, typeof(MyStruct));
builder.AddStatements(Expr.Return(Expr.ReadField(Expr.Parameter(1, typeof(MyStruct)), typeof(MyStruct).GetField("MyField"))));
Console.WriteLine(builder.ToString());
builder.Compile();
mb = typeBuilder.DefineMethod("saveStructField", MethodAttributes.Public);
mb.SetParameters(typeof(MyStruct), typeof(string));
mb.SetReturnType(typeof(MyStruct));
builder = new MethodBodyBuilder(mb, typeof(MyStruct), typeof(string));
builder.AddStatements(
Expr.WriteField(Expr.Parameter(1, typeof(MyStruct)), typeof(MyStruct).GetField("MyField"), Expr.Parameter(2, typeof(string))),
Expr.Return(Expr.Parameter(1, typeof(MyStruct))));
Console.WriteLine(builder.ToString());
builder.Compile();
mb = typeBuilder.DefineMethod("createStruct", MethodAttributes.Public);
mb.SetReturnType(typeof(MyStruct));
builder = new MethodBodyBuilder(mb, typeof(MyStruct), typeof(string));
builder.AddStatements(Expr.Return(Expr.New(typeof(MyStruct))));//, Expr.Constant(32L), Expr.Constant("abcd")
Console.WriteLine(builder.ToString());
builder.Compile();
mb = typeBuilder.DefineMethod("catchException", MethodAttributes.Public);
mb.SetReturnType(typeof(Exception));
builder = new MethodBodyBuilder(mb);
var local = Expr.LocalVariable(typeof(Exception), "e");
builder.AddStatements(
Expr.DeclareLocal(local),
Expr.TryCatch(
Expr.Throw(Expr.New(typeof(InvalidOperationException), Expr.Constant("abc"))),
new CatchBlock(typeof(InvalidOperationException), local, false, Expr.Empty())),
Expr.Return(Expr.ReadLocal(local)));
Console.WriteLine(builder.ToString());
builder.Compile();
typeBuilder.CreateType();
asmBuilder.Save(fileName);
}
