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100 lines
4.7 KiB
100 lines
4.7 KiB
#Region "Microsoft.VisualBasic::ea446aac1e03ab1cea5e67ee0c8247e6, XDRStream\Reading\ReadBuilder.EmitDynReadMapper.vb"
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' Author:
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'
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' asuka (amethyst.asuka@gcmodeller.org)
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' xie (genetics@smrucc.org)
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' xieguigang (xie.guigang@live.com)
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'
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' Copyright (c) 2018 GPL3 Licensed
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'
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'
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' GNU GENERAL PUBLIC LICENSE (GPL3)
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'
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'
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' This program is free software: you can redistribute it and/or modify
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' it under the terms of the GNU General Public License as published by
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' the Free Software Foundation, either version 3 of the License, or
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' (at your option) any later version.
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'
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' This program is distributed in the hope that it will be useful,
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' but WITHOUT ANY WARRANTY; without even the implied warranty of
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' MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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' GNU General Public License for more details.
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'
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' You should have received a copy of the GNU General Public License
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' along with this program. If not, see <http://www.gnu.org/licenses/>.
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' /********************************************************************************/
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' Summaries:
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' Class ReadBuilder
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'
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' Function: DefineCacheField, EmitDynReadMapper
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'
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' Sub: EmitInitField, EmitOverride_GetCacheType
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'
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'
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' /********************************************************************************/
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#End Region
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Imports System
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Imports System.Reflection
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Imports System.Reflection.Emit
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Namespace Reading
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Partial Public NotInheritable Class ReadBuilder
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Private Function EmitDynReadMapper() As Type
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Dim typeBuilder = _modBuilder.DefineType("DynReadMapper", TypeAttributes.NotPublic Or TypeAttributes.Class Or TypeAttributes.Sealed, GetType(ReadMapper))
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Dim fb_oneCacheType = DefineCacheField(typeBuilder, "_oneCacheType")
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Dim fb_fixCacheType = DefineCacheField(typeBuilder, "_fixCacheType")
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Dim fb_varCacheType = DefineCacheField(typeBuilder, "_varCacheType")
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Dim ctor = typeBuilder.DefineConstructor(MethodAttributes.Public, CallingConventions.Standard, New Type(-1) {})
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Dim ilCtor As ILGenerator = ctor.GetILGenerator()
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ilCtor.Emit(OpCodes.Ldarg_0)
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ilCtor.Emit(OpCodes.Call, GetType(ReadMapper).GetConstructor(BindingFlags.Instance Or BindingFlags.NonPublic, Nothing, New Type(-1) {}, Nothing))
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ilCtor.Emit(OpCodes.Ldarg_0)
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ilCtor.Emit(OpCodes.Ldftn, GetType(ReadMapper).GetMethod("AppendBuildRequest", BindingFlags.NonPublic Or BindingFlags.Instance))
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ilCtor.Emit(OpCodes.Newobj, GetType(Action(Of Type, OpaqueType)).GetConstructor(New Type() {GetType(Object), GetType(IntPtr)}))
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ilCtor.Emit(OpCodes.Stsfld, _buildBinderDescription.BuildRequest)
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EmitInitField(ilCtor, fb_oneCacheType, _oneCacheDescription.Result)
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EmitInitField(ilCtor, fb_fixCacheType, _fixCacheDescription.Result)
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EmitInitField(ilCtor, fb_varCacheType, _varCacheDescription.Result)
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' run init
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ilCtor.Emit(OpCodes.Ldarg_0)
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ilCtor.Emit(OpCodes.Call, GetType(ReadMapper).GetMethod("Init", BindingFlags.Instance Or BindingFlags.NonPublic))
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ilCtor.Emit(OpCodes.Ret)
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EmitOverride_GetCacheType(typeBuilder, "GetOneCacheType", fb_oneCacheType)
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EmitOverride_GetCacheType(typeBuilder, "GetFixCacheType", fb_fixCacheType)
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EmitOverride_GetCacheType(typeBuilder, "GetVarCacheType", fb_varCacheType)
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Return typeBuilder.CreateType()
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End Function
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Private Shared Function DefineCacheField(typeBuilder As TypeBuilder, name As String) As FieldBuilder
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Return typeBuilder.DefineField(name, GetType(Type), FieldAttributes.Private Or FieldAttributes.InitOnly)
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End Function
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Private Shared Sub EmitInitField(il As ILGenerator, fb As FieldBuilder, type As Type)
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il.Emit(OpCodes.Ldarg_0)
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il.Emit(OpCodes.Ldtoken, type)
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il.Emit(OpCodes.Call, GetType(Type).GetMethod("GetTypeFromHandle"))
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il.Emit(OpCodes.Stfld, fb)
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End Sub
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Private Sub EmitOverride_GetCacheType(typeBuilder As TypeBuilder, overrideName As String, fb_cacheType As FieldBuilder)
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Dim mb = typeBuilder.DefineMethod(overrideName, MethodAttributes.Family Or MethodAttributes.Virtual)
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mb.SetReturnType(GetType(Type))
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typeBuilder.DefineMethodOverride(mb, GetType(ReadMapper).GetMethod(overrideName, BindingFlags.NonPublic Or BindingFlags.Instance))
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Dim il As ILGenerator = mb.GetILGenerator()
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il.Emit(OpCodes.Ldarg_0)
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il.Emit(OpCodes.Ldfld, fb_cacheType)
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il.Emit(OpCodes.Ret)
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End Sub
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End Class
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End Namespace
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