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/* | |
## Mono JIT compiler version 2.10.9 (tarball Mon May 7 20:25:51 EDT 2012) | |
DynamicMethod creation: 0.0453009000ms | |
LINQ expressions creation: 0.0971724000ms | |
Delegate creation: 0.0044351000ms | |
DynamicMethod invocation: 0.0000612000ms | |
Expression invocation: 0.0000609000ms | |
MethodInfo invocation: 0.0007135000ms | |
Delegate invocation: 0.0000619000ms | |
Calls to reach even with MethodInfo: | |
DynamicMethod: 63.5768745620178 | |
Expression: 136.276524176593 | |
Delegate: 6.30273300630694 | |
## Mono JIT compiler version 3.0.1 (master/3f4e46b Thu Oct 25 12:07:02 EDT 2012) | |
DynamicMethod creation: 0.0517962000ms | |
LINQ expressions creation: 0.1078764000ms | |
Delegate creation: 0.0037262000ms | |
DynamicMethod invocation: 0.0000492000ms | |
Expression invocation: 0.0000484000ms | |
MethodInfo invocation: 0.0008519000ms | |
Delegate invocation: 0.0000573000ms | |
Calls to reach even with MethodInfo: | |
DynamicMethod: 60.8585514731802 | |
Expression: 126.687169855622 | |
Delegate: 4.44124897288432 | |
## .NET 4.5 w/ Windows 8 6.2.8400 | |
DynamicMethod creation: 0.0090425000ms | |
LINQ expressions creation: 0.3854721000ms | |
Delegate creation: 0.0069054000ms | |
DynamicMethod invocation: 0.0000930000ms | |
Expression invocation: 0.0000917000ms | |
MethodInfo invocation: 0.0003422000ms | |
Delegate invocation: 0.0000697000ms | |
Calls to reach even with MethodInfo: | |
DynamicMethod: 26.6963763880768 | |
Expression: 1126.7206312098 | |
Delegate: 20.3831092928111 | |
*/ | |
using System; | |
using System.Linq; | |
using System.Linq.Expressions; | |
using System.Reflection; | |
using System.Reflection.Emit; | |
using Cadenza; | |
namespace Getter | |
{ | |
static class Program | |
{ | |
static void Main(string[] args) | |
{ | |
PropertyInfo prop = typeof (Foo).GetProperty ("Name"); | |
//Console.WriteLine (CreateDynamicMethodDelegate (prop) (new Foo { Name = "bar " })); | |
//Console.WriteLine (CreateGetPropertyDelegate (prop) (new Foo { Name = "bar " })); | |
Action<PropertyInfo> createDynamic = p => CreateDynamicMethodDelegate (p); | |
Action<PropertyInfo> createExpr = p => CreateGetPropertyDelegate (p); | |
Action<PropertyInfo> createDelegate = p => Delegate.CreateDelegate (typeof(Func<Foo, object>), prop.GetGetMethod ()); | |
double createDynamicTime = createDynamic.Timings (prop, 1000).Average (t => t.TotalMilliseconds); | |
double createExpressionTime = createExpr.Timings (prop, 1000).Average (t => t.TotalMilliseconds); | |
double createDelegateTime = createDelegate.Timings (prop, 1000).Average (t => t.TotalMilliseconds); | |
Console.WriteLine (" DynamicMethod creation:\t{0:N10}ms", createDynamicTime); | |
Console.WriteLine ("LINQ expressions creation:\t{0:N10}ms", createExpressionTime); | |
Console.WriteLine (" Delegate creation:\t{0:N10}ms", createDelegateTime); | |
Foo foo = new Foo { Name = "bar" }; | |
Func<object, object> getNameDynamic = CreateDynamicMethodDelegate (prop); | |
Action<Func<object, object>, Foo> testDynamic = (d, o) => d (o); | |
double getDyanmicTime = testDynamic.Timings (getNameDynamic, foo, 1000).Average (t => t.TotalMilliseconds); | |
Func<object, object> getNameExpression = CreateDynamicMethodDelegate (prop); | |
Action<Func<object, object>, Foo> testExpression = (d, o) => d (o); | |
double getExpressionTime = testExpression.Timings (getNameExpression, foo, 1000).Average (t => t.TotalMilliseconds); | |
Action<MethodInfo, Foo> testMethod = (m, f) => m.Invoke (f, null); | |
double getMethodTime = testMethod.Timings (prop.GetGetMethod(), foo, 1000).Average (t => t.TotalMilliseconds); | |
Func<Foo, string> invokeDelegate = (Func<Foo, string>) Delegate.CreateDelegate (typeof(Func<Foo, string>), prop.GetGetMethod ()); | |
Action<Foo> testDelegate = f => invokeDelegate (f); | |
double invokeDelegateTime = testDelegate.Timings (foo, 1000).Average (t => t.TotalMilliseconds); | |
Console.WriteLine(); | |
Console.WriteLine ("DynamicMethod invocation:\t{0:N10}ms", getDyanmicTime); | |
Console.WriteLine (" Expression invocation:\t{0:N10}ms", getExpressionTime); | |
Console.WriteLine (" MethodInfo invocation:\t{0:N10}ms", getMethodTime); | |
Console.WriteLine (" Delegate invocation:\t{0:N10}ms", invokeDelegateTime); | |
Console.WriteLine(); | |
Console.WriteLine ("Calls to reach even with MethodInfo:"); | |
Console.WriteLine ("DynamicMethod:\t" + ((createDynamicTime + getDyanmicTime) / getMethodTime)); | |
Console.WriteLine (" Expression:\t" + ((createExpressionTime + getExpressionTime) / getMethodTime)); | |
Console.WriteLine (" Delegate:\t" + ((createDelegateTime + invokeDelegateTime) / getMethodTime)); | |
} | |
private static Func<object, object> CreateDynamicMethodDelegate (PropertyInfo prop) | |
{ | |
DynamicMethod method = new DynamicMethod ("name", typeof(object), new[] { typeof (object) }); | |
ILGenerator gen = method.GetILGenerator(); | |
gen.Emit (OpCodes.Ldarg_0); | |
gen.Emit (OpCodes.Castclass, prop.DeclaringType); | |
gen.Emit (OpCodes.Callvirt, prop.GetGetMethod ()); | |
gen.Emit (OpCodes.Ret); | |
return (Func<object,object>)method.CreateDelegate (typeof (Func<object, object>)); | |
} | |
private static Func<object, object> CreateGetPropertyDelegate (PropertyInfo prop) | |
{ | |
var instance = Expression.Parameter(typeof(object), "instance"); | |
var instCast = prop.GetGetMethod(true).IsStatic ? null : Expression.Convert(instance, prop.ReflectedType); | |
var propAcc = Expression.Property(instCast, prop); | |
var castProp = Expression.Convert(propAcc, typeof(object)); | |
var lambda = Expression.Lambda<Func<object, object>> (castProp, instance); | |
return lambda.Compile(); | |
} | |
} | |
public class Foo | |
{ | |
public string Name | |
{ | |
get; | |
set; | |
} | |
} | |
} |
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