public Method(CLRMetaDataParser parser)
{
m_offsetToInstruction = new Dictionary<uint, uint>();
m_instructionToOffset = new List<uint>();
byte headByte = parser.ReadU8();
uint codeSize;
bool haveSections;
int format = (headByte & 0x3);
if (format == CorILMethod_TinyFormat)
{
// Tiny format (II.25.4.2)
codeSize = ((uint)headByte >> 2);
MaxStack = 8;
haveSections = false;
}
else if (format == CorILMethod_FatFormat)
{
// Fat format (II.25.4.3)
byte highByte = parser.ReadU8();
uint flagsAndSize = ((uint)headByte | ((uint)highByte << 8));
uint headerSizeInDWords = (flagsAndSize >> 12) & 0xf;
if (headerSizeInDWords != 3)
throw new ParseFailedException("Unsupported method format");
MaxStack = parser.ReadU16();
codeSize = parser.ReadU32();
CLRStandAloneSigRow localSig = (CLRStandAloneSigRow)parser.ReadFatToken();
if (localSig != null)
LocalVarSig = new CLRSigLocalVarSig(new CLRSignatureParser(localSig.Signature, parser.Tables));
haveSections = ((flagsAndSize & CorILMethod_MoreSects) != 0);
}
else
throw new ParseFailedException("Invalid IL method format");
ParseCode(parser, codeSize);
List<MethodDataSection> sections = new List<MethodDataSection>();
while (haveSections)
{
parser.Align(4);
sections.Add(MethodDataSection.Parse(parser, m_offsetToInstruction, out haveSections));
}
Sections = sections.ToArray();
}
public void ParseCode(CLRMetaDataParser parser, uint codeSize)
{
InstructionParser instParser = new InstructionParser(parser.ReadBytes(codeSize), parser.Tables, parser.BinData);
List<HLInstruction> instructions = new List<HLInstruction>();
while (!instParser.AtEnd)
{
long pos = instParser.Position;
m_offsetToInstruction[(uint)pos] = (uint)instructions.Count;
m_instructionToOffset.Add((uint)pos);
instructions.Add(instParser.DecodeInstruction());
}
m_instructionToOffset.Add((uint)instParser.Position);
// Unpatch instructions
for (int i = 0; i < instructions.Count; i++)
{
HLInstruction instr = instructions[i];
if ((instr.Flags & HLOpFlags.Br) != 0)
{
instr.ConvertBranchTargets(m_instructionToOffset[i + 1], m_offsetToInstruction);
instructions[i] = instr;
}
}
Instructions = instructions.ToArray();
}
