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Viewing changes to external/ikvm/reflect/MethodBody.cs

  • Committer: Package Import Robot
  • Author(s): Jo Shields
  • Date: 2013-05-12 09:46:03 UTC
  • mto: This revision was merged to the branch mainline in revision 29.
  • Revision ID: package-import@ubuntu.com-20130512094603-mad323bzcxvmcam0
Tags: upstream-4.0.5+dfsg
Import upstream version 4.0.5+dfsg

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external/ikvm/reflect/MethodBody.cs
 
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/*
 
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  Copyright (C) 2009 Jeroen Frijters
 
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  This software is provided 'as-is', without any express or implied
 
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  warranty.  In no event will the authors be held liable for any damages
 
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  arising from the use of this software.
 
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  Permission is granted to anyone to use this software for any purpose,
 
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  including commercial applications, and to alter it and redistribute it
 
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  freely, subject to the following restrictions:
 
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  1. The origin of this software must not be misrepresented; you must not
 
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     claim that you wrote the original software. If you use this software
 
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     in a product, an acknowledgment in the product documentation would be
 
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     appreciated but is not required.
 
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  2. Altered source versions must be plainly marked as such, and must not be
 
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     misrepresented as being the original software.
 
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  3. This notice may not be removed or altered from any source distribution.
 
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  Jeroen Frijters
 
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  jeroen@frijters.net
 
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*/
 
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using System;
 
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using System.Collections.Generic;
 
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using IKVM.Reflection.Reader;
 
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using System.IO;
 
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namespace IKVM.Reflection
 
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{
 
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        public sealed class MethodBody
 
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        {
 
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                private readonly IList<ExceptionHandlingClause> exceptionClauses;
 
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                private readonly IList<LocalVariableInfo> locals;
 
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                private readonly bool initLocals;
 
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                private readonly int maxStack;
 
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                private readonly int localVarSigTok;
 
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                private byte[] body;
 
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                internal MethodBody(ModuleReader module, int rva, IGenericContext context)
 
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                {
 
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                        const byte CorILMethod_TinyFormat = 0x02;
 
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                        const byte CorILMethod_FatFormat = 0x03;
 
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                        const byte CorILMethod_MoreSects = 0x08;
 
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                        const byte CorILMethod_InitLocals = 0x10;
 
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                        const byte CorILMethod_Sect_EHTable = 0x01;
 
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                        const byte CorILMethod_Sect_FatFormat = 0x40;
 
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                        const byte CorILMethod_Sect_MoreSects = 0x80;
 
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                        List<ExceptionHandlingClause> exceptionClauses = new List<ExceptionHandlingClause>();
 
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                        List<LocalVariableInfo> locals = new List<LocalVariableInfo>();
 
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                        module.SeekRVA(rva);
 
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                        BinaryReader br = new BinaryReader(module.stream);
 
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                        byte b = br.ReadByte();
 
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                        if ((b & 3) == CorILMethod_TinyFormat)
 
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                        {
 
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                                initLocals = true;
 
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                                body = br.ReadBytes(b >> 2);
 
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                                maxStack = 8;
 
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                        }
 
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                        else if ((b & 3) == CorILMethod_FatFormat)
 
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                        {
 
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                                initLocals = (b & CorILMethod_InitLocals) != 0;
 
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                                short flagsAndSize = (short)(b | (br.ReadByte() << 8));
 
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                                if ((flagsAndSize >> 12) != 3)
 
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                                {
 
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                                        throw new BadImageFormatException("Fat format method header size should be 3");
 
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                                }
 
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                                maxStack = br.ReadUInt16();
 
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                                int codeLength = br.ReadInt32();
 
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                                localVarSigTok = br.ReadInt32();
 
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                                body = br.ReadBytes(codeLength);
 
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                                if ((b & CorILMethod_MoreSects) != 0)
 
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                                {
 
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                                        module.stream.Position = (module.stream.Position + 3) & ~3;
 
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                                        int hdr = br.ReadInt32();
 
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                                        if ((hdr & CorILMethod_Sect_MoreSects) != 0 || (hdr & CorILMethod_Sect_EHTable) == 0)
 
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                                        {
 
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                                                throw new NotImplementedException();
 
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                                        }
 
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                                        else if ((hdr & CorILMethod_Sect_FatFormat) != 0)
 
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                                        {
 
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                                                int count = ComputeExceptionCount((hdr >> 8) & 0xFFFFFF, 24);
 
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                                                for (int i = 0; i < count; i++)
 
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                                                {
 
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                                                        int flags = br.ReadInt32();
 
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                                                        int tryOffset = br.ReadInt32();
 
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                                                        int tryLength = br.ReadInt32();
 
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                                                        int handlerOffset = br.ReadInt32();
 
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                                                        int handlerLength = br.ReadInt32();
 
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                                                        int classTokenOrFilterOffset = br.ReadInt32();
 
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                                                        exceptionClauses.Add(new ExceptionHandlingClause(module, flags, tryOffset, tryLength, handlerOffset, handlerLength, classTokenOrFilterOffset, context));
 
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                                                }
 
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                                        }
 
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                                        else
 
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                                        {
 
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                                                int count = ComputeExceptionCount((hdr >> 8) & 0xFF, 12);
 
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                                                for (int i = 0; i < count; i++)
 
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                                                {
 
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                                                        int flags = br.ReadUInt16();
 
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                                                        int tryOffset = br.ReadUInt16();
 
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                                                        int tryLength = br.ReadByte();
 
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                                                        int handlerOffset = br.ReadUInt16();
 
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                                                        int handlerLength = br.ReadByte();
 
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                                                        int classTokenOrFilterOffset = br.ReadInt32();
 
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                                                        exceptionClauses.Add(new ExceptionHandlingClause(module, flags, tryOffset, tryLength, handlerOffset, handlerLength, classTokenOrFilterOffset, context));
 
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                                                }
 
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                                        }
 
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                                }
 
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                                if (localVarSigTok != 0)
 
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                                {
 
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                                        ByteReader sig = module.GetStandAloneSig((localVarSigTok & 0xFFFFFF) - 1);
 
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                                        Signature.ReadLocalVarSig(module, sig, context, locals);
 
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                                }
 
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                        }
 
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                        else
 
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                        {
 
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                                throw new BadImageFormatException();
 
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                        }
 
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                        this.exceptionClauses = exceptionClauses.AsReadOnly();
 
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                        this.locals = locals.AsReadOnly();
 
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                }
 
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                private static int ComputeExceptionCount(int size, int itemLength)
 
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                {
 
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                        // LAMESPEC according to the spec, the count should be calculated as "(size - 4) / itemLength",
 
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                        // FXBUG but to workaround a VB compiler bug that specifies the size incorrectly,
 
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                        // we do a truncating division instead.
 
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                        return size / itemLength;
 
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                }
 
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                public IList<ExceptionHandlingClause> ExceptionHandlingClauses
 
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                {
 
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                        get { return exceptionClauses; }
 
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                }
 
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                public bool InitLocals
 
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                {
 
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                        get { return initLocals; }
 
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                }
 
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                public IList<LocalVariableInfo> LocalVariables
 
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                {
 
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                        get { return locals; }
 
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                }
 
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                public byte[] GetILAsByteArray()
 
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                {
 
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                        return body;
 
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                }
 
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                public int LocalSignatureMetadataToken
 
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                {
 
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                        get { return localVarSigTok; }
 
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                }
 
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                public int MaxStackSize
 
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                {
 
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                        get { return maxStack; }
 
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                }
 
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        }
 
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}