/src/Boo.Lang/Runtime/DispatcherEmitter.cs
C# | 171 lines | 126 code | 20 blank | 25 comment | 7 complexity | abc80996e0ba151d6b7789f784e0198e MD5 | raw file
Possible License(s): GPL-2.0
- #region license
- // Copyright (c) 2003, 2004, 2005 Rodrigo B. de Oliveira (rbo@acm.org)
- // All rights reserved.
- //
- // Redistribution and use in source and binary forms, with or without modification,
- // are permitted provided that the following conditions are met:
- //
- // * Redistributions of source code must retain the above copyright notice,
- // this list of conditions and the following disclaimer.
- // * Redistributions in binary form must reproduce the above copyright notice,
- // this list of conditions and the following disclaimer in the documentation
- // and/or other materials provided with the distribution.
- // * Neither the name of Rodrigo B. de Oliveira nor the names of its
- // contributors may be used to endorse or promote products derived from this
- // software without specific prior written permission.
- //
- // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
- // ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
- // WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- // DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
- // FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- // DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
- // SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
- // CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
- // OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
- // THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- #endregion
-
-
- using System;
- using System.Reflection;
- using System.Reflection.Emit;
-
- namespace Boo.Lang.Runtime
- {
- public abstract class DispatcherEmitter
- {
- private DynamicMethod _dynamicMethod;
- protected readonly ILGenerator _il;
-
- public DispatcherEmitter(Type owner, string dynamicMethodName)
- {
- _dynamicMethod = new DynamicMethod(owner.Name + "$" + dynamicMethodName, typeof(object), new Type[] { typeof(object), typeof(object[]) }, owner);
- _il = _dynamicMethod.GetILGenerator();
- }
-
- public Dispatcher Emit()
- {
- EmitMethodBody();
- return CreateMethodDispatcher();
- }
-
- protected abstract void EmitMethodBody();
-
- protected Dispatcher CreateMethodDispatcher()
- {
- return (Dispatcher)_dynamicMethod.CreateDelegate(typeof(Dispatcher));
- }
-
- protected bool IsStobj(OpCode code)
- {
- return OpCodes.Stobj.Value == code.Value;
- }
-
- protected void EmitCastOrUnbox(Type type)
- {
- if (type.IsValueType)
- {
- _il.Emit(OpCodes.Unbox, type);
- _il.Emit(OpCodes.Ldobj, type);
- }
- else
- {
- _il.Emit(OpCodes.Castclass, type);
- }
- }
-
- protected void BoxIfNeeded(Type returnType)
- {
- if (returnType.IsValueType)
- {
- _il.Emit(OpCodes.Box, returnType);
- }
- }
-
- protected void EmitLoadTargetObject(Type expectedType)
- {
- _il.Emit(OpCodes.Ldarg_0); // target object is the first argument
- if (expectedType.IsValueType)
- {
- _il.Emit(OpCodes.Unbox, expectedType);
- }
- else
- {
- _il.Emit(OpCodes.Castclass, expectedType);
- }
- }
-
- protected void EmitReturn(Type typeOnStack)
- {
- if (typeOnStack == typeof(void))
- {
- _il.Emit(OpCodes.Ldnull);
- }
- else
- {
- BoxIfNeeded(typeOnStack);
- }
- _il.Emit(OpCodes.Ret);
- }
-
- protected MethodInfo EmitPromotion(Type expectedType)
- {
- _il.Emit(OpCodes.Castclass, typeof(IConvertible));
- _il.Emit(OpCodes.Ldnull);
- MethodInfo method = GetPromotionMethod(expectedType);
- _il.Emit(OpCodes.Callvirt, method);
- return method;
- }
-
- protected void EmitArgArrayElement(int argumentIndex)
- {
- _il.Emit(OpCodes.Ldarg_1);
- _il.Emit(OpCodes.Ldc_I4, argumentIndex);
- _il.Emit(OpCodes.Ldelem_Ref);
- }
-
- private MethodInfo GetPromotionMethod(Type type)
- {
- return typeof(IConvertible).GetMethod("To" + Type.GetTypeCode(type));
- }
-
- protected void Dup()
- {
- _il.Emit(OpCodes.Dup);
- }
-
- protected void EmitCoercion(Type actualType, Type expectedType, int score)
- {
- switch (score)
- {
- case CandidateMethod.WideningPromotion:
- case CandidateMethod.NarrowingPromotion:
- EmitPromotion(expectedType);
- break;
- case CandidateMethod.ImplicitConversionScore:
- EmitCastOrUnbox(actualType);
- _il.Emit(OpCodes.Call, RuntimeServices.FindImplicitConversionOperator(actualType, expectedType));
- break;
- default:
- EmitCastOrUnbox(expectedType);
- break;
- }
- }
-
- protected void LoadLocal(LocalBuilder value)
- {
- _il.Emit(OpCodes.Ldloc, value);
- }
-
- protected void StoreLocal(LocalBuilder value)
- {
- _il.Emit(OpCodes.Stloc, value);
- }
-
- protected LocalBuilder DeclareLocal(Type type)
- {
- return _il.DeclareLocal(type);
- }
- }
- }