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using System;
using System.Globalization;
using System.Collections.Generic;
using System.Text;
using Mono.Cecil.Cil;
using Mono.Cecil.Metadata;
using System.IO;
using System.Linq;
using System.Reflection;
namespace Mono.Debugger.Soft
{
public class MethodBodyMirror : Mirror
{
MethodMirror method;
MethodBodyInfo info;
internal MethodBodyMirror (VirtualMachine vm, MethodMirror method, MethodBodyInfo info) : base (vm, 0) {
this.method = method;
this.info = info;
}
public MethodMirror Method {
get {
return method;
}
}
public List<ILExceptionHandler> ExceptionHandlers {
get {
vm.CheckProtocolVersion (2, 18);
return info.clauses.Select (c =>
{
var handler = new ILExceptionHandler (c.try_offset, c.try_length, (ILExceptionHandlerType) c.flags, c.handler_offset, c.handler_length);
if (c.flags == ExceptionClauseFlags.None)
handler.CatchType = vm.GetType (c.catch_type_id);
else if (c.flags == ExceptionClauseFlags.Filter)
handler.FilterOffset = c.filter_offset;
return handler;
}).ToList ();
}
}
public byte[] GetILAsByteArray () {
return info.il;
}
public List<ILInstruction> Instructions {
get {
return ReadCilBody (new BinaryReader (new MemoryStream (info.il)), info.il.Length);
}
}
static bool opcodes_inited;
static OpCode [] OneByteOpCode = new OpCode [0xe0 + 1];
static OpCode [] TwoBytesOpCode = new OpCode [0x1e + 1];
// Adapted from Cecil
List<ILInstruction> ReadCilBody (BinaryReader br, int code_size)
{
long start = br.BaseStream.Position;
ILInstruction last = null;
//GenericContext context = new GenericContext (body.Method);
List<ILInstruction> code = new List<ILInstruction> ();
var by_offset = new Dictionary<int, ILInstruction> ();
if (!opcodes_inited) {
foreach (FieldInfo fi in typeof (OpCodes).GetFields (BindingFlags.Static|BindingFlags.Public)) {
var val = (OpCode)fi.GetValue (null);
if (val.Op1 == 0xff)
OneByteOpCode [val.Op2] = val;
else
TwoBytesOpCode [val.Op2] = val;
}
opcodes_inited = true;
}
while (br.BaseStream.Position < start + code_size) {
OpCode op;
long offset = br.BaseStream.Position - start;
int cursor = br.ReadByte ();
int token;
ResolvedToken t;
if (cursor == 0xfe)
op = TwoBytesOpCode [br.ReadByte ()];
else
op = OneByteOpCode [cursor];
ILInstruction instr = new ILInstruction ((int)offset, op, null);
by_offset [instr.Offset] = instr;
switch (op.OperandType) {
case OperandType.InlineNone :
break;
case OperandType.InlineSwitch :
uint length = br.ReadUInt32 ();
int [] branches = new int [length];
int [] buf = new int [length];
for (int i = 0; i < length; i++)
buf [i] = br.ReadInt32 ();
for (int i = 0; i < length; i++)
branches [i] = Convert.ToInt32 (br.BaseStream.Position - start + buf [i]);
instr.Operand = branches;
break;
case OperandType.ShortInlineBrTarget :
sbyte sbrtgt = br.ReadSByte ();
instr.Operand = Convert.ToInt32 (br.BaseStream.Position - start + sbrtgt);
break;
case OperandType.InlineBrTarget :
int brtgt = br.ReadInt32 ();
instr.Operand = Convert.ToInt32 (br.BaseStream.Position - start + brtgt);
break;
case OperandType.ShortInlineI :
if (op == OpCodes.Ldc_I4_S)
instr.Operand = br.ReadSByte ();
else
instr.Operand = br.ReadByte ();
break;
case OperandType.ShortInlineVar :
instr.Operand = br.ReadByte ();
break;
case OperandType.ShortInlineArg :
instr.Operand = br.ReadByte ();
break;
case OperandType.InlineSig :
br.ReadInt32 ();
//instr.Operand = GetCallSiteAt (br.ReadInt32 (), context);
break;
case OperandType.InlineI :
instr.Operand = br.ReadInt32 ();
break;
case OperandType.InlineVar :
instr.Operand = br.ReadInt16 ();
break;
case OperandType.InlineArg :
instr.Operand = br.ReadInt16 ();
break;
case OperandType.InlineI8 :
instr.Operand = br.ReadInt64 ();
break;
case OperandType.ShortInlineR :
instr.Operand = br.ReadSingle ();
break;
case OperandType.InlineR :
instr.Operand = br.ReadDouble ();
break;
case OperandType.InlineString :
token = br.ReadInt32 ();
t = vm.conn.Method_ResolveToken (Method.Id, token);
if (t.Type == TokenType.STRING)
instr.Operand = t.Str;
break;
case OperandType.InlineField :
case OperandType.InlineMethod :
case OperandType.InlineType :
case OperandType.InlineTok :
token = br.ReadInt32 ();
t = vm.conn.Method_ResolveToken (Method.Id, token);
switch (t.Type) {
case TokenType.TYPE:
instr.Operand = vm.GetType (t.Id);
break;
case TokenType.FIELD:
// FIXME: No vm.GetField ()
//instr.Operand = vm.GetField (t.Id);
break;
case TokenType.METHOD:
instr.Operand = vm.GetMethod (t.Id);
break;
case TokenType.UNKNOWN:
break;
default:
throw new NotImplementedException ("Unknown token type: " + t.Type);
}
break;
}
if (last != null) {
last.Next = instr;
instr.Previous = last;
}
last = instr;
code.Add (instr);
}
// resolve branches
foreach (ILInstruction i in code) {
switch (i.OpCode.OperandType) {
case OperandType.ShortInlineBrTarget:
case OperandType.InlineBrTarget:
i.Operand = by_offset [(int)i.Operand];
break;
case OperandType.InlineSwitch:
int [] lbls = (int []) i.Operand;
ILInstruction [] instrs = new ILInstruction [lbls.Length];
for (int j = 0; j < lbls.Length; j++)
instrs [j] = by_offset [lbls [j]];
i.Operand = instrs;
break;
}
}
return code;
}
}
}
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