private GetStandAloneSig ( int index ) : IKVM.Reflection.Reader.ByteReader | ||
index | int | |
return | IKVM.Reflection.Reader.ByteReader |
internal MethodBody(ModuleReader module, int rva, IGenericContext context) { const byte CorILMethod_TinyFormat = 0x02; const byte CorILMethod_FatFormat = 0x03; const byte CorILMethod_MoreSects = 0x08; const byte CorILMethod_InitLocals = 0x10; const byte CorILMethod_Sect_EHTable = 0x01; const byte CorILMethod_Sect_FatFormat = 0x40; const byte CorILMethod_Sect_MoreSects = 0x80; List<ExceptionHandlingClause> exceptionClauses = new List<ExceptionHandlingClause>(); List<LocalVariableInfo> locals = new List<LocalVariableInfo>(); Stream stream = module.GetStream(); module.SeekRVA(rva); BinaryReader br = new BinaryReader(stream); byte b = br.ReadByte(); if ((b & 3) == CorILMethod_TinyFormat) { initLocals = true; body = br.ReadBytes(b >> 2); maxStack = 8; } else if ((b & 3) == CorILMethod_FatFormat) { initLocals = (b & CorILMethod_InitLocals) != 0; short flagsAndSize = (short)(b | (br.ReadByte() << 8)); if ((flagsAndSize >> 12) != 3) { throw new BadImageFormatException("Fat format method header size should be 3"); } maxStack = br.ReadUInt16(); int codeLength = br.ReadInt32(); localVarSigTok = br.ReadInt32(); body = br.ReadBytes(codeLength); if ((b & CorILMethod_MoreSects) != 0) { stream.Position = (stream.Position + 3) & ~3; int hdr = br.ReadInt32(); if ((hdr & CorILMethod_Sect_MoreSects) != 0 || (hdr & CorILMethod_Sect_EHTable) == 0) { throw new NotImplementedException(); } else if ((hdr & CorILMethod_Sect_FatFormat) != 0) { int count = ComputeExceptionCount((hdr >> 8) & 0xFFFFFF, 24); for (int i = 0; i < count; i++) { int flags = br.ReadInt32(); int tryOffset = br.ReadInt32(); int tryLength = br.ReadInt32(); int handlerOffset = br.ReadInt32(); int handlerLength = br.ReadInt32(); int classTokenOrFilterOffset = br.ReadInt32(); exceptionClauses.Add(new ExceptionHandlingClause(module, flags, tryOffset, tryLength, handlerOffset, handlerLength, classTokenOrFilterOffset, context)); } } else { int count = ComputeExceptionCount((hdr >> 8) & 0xFF, 12); for (int i = 0; i < count; i++) { int flags = br.ReadUInt16(); int tryOffset = br.ReadUInt16(); int tryLength = br.ReadByte(); int handlerOffset = br.ReadUInt16(); int handlerLength = br.ReadByte(); int classTokenOrFilterOffset = br.ReadInt32(); exceptionClauses.Add(new ExceptionHandlingClause(module, flags, tryOffset, tryLength, handlerOffset, handlerLength, classTokenOrFilterOffset, context)); } } } if (localVarSigTok != 0) { ByteReader sig = module.GetStandAloneSig((localVarSigTok & 0xFFFFFF) - 1); Signature.ReadLocalVarSig(module, sig, context, locals); } } else { throw new BadImageFormatException(); } this.exceptionClauses = exceptionClauses.AsReadOnly(); this.locals = locals.AsReadOnly(); }