PowerEmit

Reflection library for dynamic assemble / disassemble

Concept

PowerEmit is designed as lightweight helper for dynamic IL generating.

PowerEmit improves quality of editor support and miscoding prevention while meeting with common usage for ILGenerator. So this library does not provide high-level method generation.

Demo

Emit IL

using PowerEmit;

// common style
gen.Emit(OpCodes.Ldstr, "Hello, ");
gen.Emit(OpCodes.Ldarg_0);
gen.Emit(OpCodes.Ldstr, "!");
gen.Emit(OpCodes.Call, methodInfo_string_Concat);
gen.Emit(OpCodes.Call, methodInfo_Console_WriteLine);
gen.Emit(OpCodes.Ret);

// using PowerEmit on simple way
gen.Emit(Inst.Ldstr("Hello, "));
gen.Emit(Inst.Ldarg_0());
gen.Emit(Inst.Ldstr("!"));
gen.Emit(Inst.Call(methodInfo_string_Concat));
gen.Emit(Inst.Call(methodInfo_Console_WriteLine));
gen.Emit(Inst.Ret());

// collection is also available on PowerEmit
var list = new List<IILStreamAction> {
    Inst.Ldstr("Hello, "),
    Inst.Ldarg_0(),
    Inst.Ldstr("!"),
    Inst.Call(methodInfo_string_Concat),
    Inst.Call(methodInfo_Console_WriteLine),
    Inst.Ret(),
};
foreach(var action in list)
    gen.Emit(action);

// PowerEmit can coexist common style.
gen.Emit(Inst.Ldstr("Hello, "));
gen.Emit(OpCodes.Ldarg_0);
gen.Emit(Inst.Ldstr("!"));
gen.Emit(Inst.Call(methodInfo_string_Concat));
gen.Emit(Inst.Call(methodInfo_Console_WriteLine));
gen.Emit(OpCodes.Ret);

Disassembler

PowerEmit provides disassembler.

using PowerEmit.Disassemblers;

var methodInfo = typeof(SomeType).GetMethod("SomeMethod");
var disassembled = ILDisassembler.Instance.Disassemble(methodInfo);
foreach(var action in disassembled.ILActions)
    Console.WriteLine(action);

Deoptimizer

PowerEmit provides deoptimizer. By using with disassembler, deoptimizer enables to edit IL method safely.

using PowerEmit.Disassemblers;

var methodInfo = typeof(SomeType).GetMethod("SomeMethod");
var disassembled = ILDisassembler.Instance.Disassemble(methodInfo);
var deoptimized = ILDeoptimizer.Instance.Disassemble(disassembled.ILActions);
foreach(var action in deoptimized)
    Console.WriteLine(action);

Requirement

• .Net Standard 2.0
  • System.Collections.Immutable v5.0.0
  • System.Memory v4.5.4
  • System.Reflection.Emit v4.7.0
  • System.RuntimeCompilerServices.Unsafe v5.0.0

License

Apache v2 License

Author

aka-nse