private static TryCatchBlock CreateTryBlock(ILStream code, int tryOffset, int tryLength)
{
int entryIndex = code.GetOffsetIndex(tryOffset);
int exitIndex = GetIndex(code, tryOffset, tryLength);
var tryBlock = new TryCatchBlock
{
EntryPoint = code[entryIndex],
ExitPoint = code[exitIndex]
};
return(tryBlock);
}
private static int GetIndex(ILStream code, int offset, int length)
{
int index = code.GetOffsetIndex(offset + length);
if (index == code.Count - 1)
{
return(index);
}
index--;
return(index >= 0 ? index : code.Count - 1);
}
public void SetupInstructions(ILStream code)
{
Code = code;
for (int i = EntryIndex; i <= ExitIndex; ++i)
{
var instr = code[i];
if (instr.SehBlock == null)
{
instr.SehBlock = this;
VisitInstruction(instr);
}
}
}
private static void SetupInstructions(ILStream code, Block block)
{
foreach (var kid in block.Kids)
{
SetupInstructions(code, kid);
}
var tryBlock = block as TryCatchBlock;
if (tryBlock != null)
{
foreach (var h in tryBlock.Handlers.Cast <HandlerBlock>())
{
SetupInstructions(code, h);
}
}
block.SetupInstructions(code);
}
private ILStream ReadCode(IMethod method, IMethodContext context, BufferedBinaryReader reader, int codeSize)
{
var list = new ILStream();
var startPos = reader.Position;
int offset = 0;
while (offset < codeSize)
{
var pos = reader.Position;
var instr = ReadInstruction(method, context, reader, startPos);
var size = reader.Position - pos;
offset += (int)size;
instr.Index = list.Count;
list.Add(instr);
if (!HasGenericInstructions && instr.IsGenericContext)
{
_genericFlags |= GenericFlags.HasGenericInstructions;
}
}
return(list);
}
private static TryCatchBlock EnshureTryBlock(IList <SEHBlock> blocks, int i, TryCatchBlock tryBlock, ILStream code, SEHBlock block, ICollection <TryCatchBlock> list)
{
if (tryBlock == null)
{
tryBlock = CreateTryBlock(code, block.TryOffset, block.TryLength);
list.Add(tryBlock);
}
else
{
var prev = blocks[i - 1];
if (prev.TryOffset != block.TryOffset ||
prev.TryLength != block.TryLength)
{
tryBlock = CreateTryBlock(code, block.TryOffset, block.TryLength);
list.Add(tryBlock);
}
}
return(tryBlock);
}
private IReadOnlyList <TryCatchBlock> TranslateSehBlocks(IMethod method, IMethodContext context, IList <SEHBlock> blocks, ILStream code)
{
var list = new List <TryCatchBlock>();
var handlers = new BlockList();
TryCatchBlock tryBlock = null;
int n = blocks.Count;
for (int i = 0; i < n; ++i)
{
var block = blocks[i];
tryBlock = EnshureTryBlock(blocks, i, tryBlock, code, block, list);
var handler = CreateHandlerBlock(method, context, code, block);
int entryIndex = code.GetOffsetIndex(block.HandlerOffset);
int exitIndex = GetIndex(code, block.HandlerOffset, block.HandlerLength);
handler.EntryPoint = code[entryIndex];
handler.ExitPoint = code[exitIndex];
tryBlock.Handlers.Add(handler);
handlers.Add(handler);
}
//set parents
for (int i = 0; i < list.Count; ++i)
{
var block = list[i];
var parent = FindParent(list, block);
if (parent != null)
{
parent.Add(block);
list.RemoveAt(i);
--i;
}
}
foreach (var block in list)
{
SetupInstructions(code, block);
}
return(list.AsReadOnlyList());
}
public MethodBody(IMethod method, IMethodContext context, BufferedBinaryReader reader)
{
if (method == null)
{
throw new ArgumentNullException("method");
}
if (context == null)
{
throw new ArgumentNullException("context");
}
if (reader == null)
{
throw new ArgumentNullException("reader");
}
_method = method;
int lsb = reader.ReadUInt8();
var flags = (MethodBodyFlags)lsb;
_maxStackSize = 8;
var format = flags & MethodBodyFlags.FormatMask;
List <SEHBlock> sehBlocks = null;
switch (format)
{
case MethodBodyFlags.FatFormat:
{
byte msb = reader.ReadUInt8();
int dwordMultipleSize = (msb & 0xF0) >> 4;
Debug.Assert(dwordMultipleSize == 3); // the fat header is 3 dwords
_maxStackSize = reader.ReadUInt16();
int codeSize = reader.ReadInt32();
int localSig = reader.ReadInt32();
flags = (MethodBodyFlags)((msb & 0x0F) << 8 | lsb);
_code = ReadCode(method, context, reader, codeSize);
if ((flags & MethodBodyFlags.MoreSects) != 0)
{
sehBlocks = ReadSehBlocks(reader);
}
bool hasGenericVars;
_vars = context.ResolveLocalVariables(method, localSig, out hasGenericVars);
if (hasGenericVars)
{
_genericFlags |= GenericFlags.HasGenericVars;
}
}
break;
case MethodBodyFlags.TinyFormat:
case MethodBodyFlags.TinyFormat1:
{
int codeSize = (lsb >> 2);
_code = ReadCode(method, context, reader, codeSize);
}
break;
default:
throw new NotSupportedException("Not supported method body format!");
}
TranslateOffsets();
if (sehBlocks != null)
{
_protectedBlocks = TranslateSehBlocks(method, context, sehBlocks, _code);
}
context.LinkDebugInfo(this);
}
