// We no longer have the machinery in place to do this right so what we'll
// do is catch the most common failures which tend to be simple mistakes
// like recursive properties. We'll do this by failing if we have a recursive
// call and no early returns or branches.
public void VisitReturn(End end)
{
if (!m_hasBranch && end.Index < m_info.Instructions.Length - 1)
{
m_hasBranch = true;
Log.DebugLine(this, "early return at {0:X2}", end.Untyped.Offset);
}
}
public void VisitRet(End end)
{
if (m_isMain && m_offset < 0 && end.Index > 0)
{
if (end.Untyped.OpCode.Code == Code.Ret)
{
Log.DebugLine(this, "checking {0}", end);
DoCheckLoad(end);
}
}
}
// match:
// ldsfld field
// ret
public void VisitRet(End end)
{
if (m_needsCheck && !m_foundRet && m_foundSingle)
{
if (end.Untyped.OpCode.Code == Code.Ret && end.Index > 1)
{
LoadStaticField load = m_info.Instructions[end.Index - 1] as LoadStaticField;
if (load != null && load.Field == m_field)
{
Log.DebugLine(this, "found return at {0:X2}", end.Untyped.Offset);
m_foundRet = true;
}
}
}
}
private TypedInstruction DoGetTyped(MethodDefinition method, Instruction untyped, int index)
{
TypedInstruction instruction = null;
switch (untyped.OpCode.Code)
{
case Code.Add:
case Code.Add_Ovf:
case Code.Add_Ovf_Un:
case Code.And:
case Code.Div:
case Code.Div_Un:
case Code.Mul:
case Code.Mul_Ovf:
case Code.Mul_Ovf_Un:
case Code.Or:
case Code.Rem:
case Code.Rem_Un:
case Code.Shl:
case Code.Shr:
case Code.Shr_Un:
case Code.Sub:
case Code.Sub_Ovf:
case Code.Sub_Ovf_Un:
case Code.Xor:
instruction = new BinaryOp(untyped, index);
break;
case Code.Beq:
case Code.Beq_S:
case Code.Bge:
case Code.Bge_S:
case Code.Bge_Un:
case Code.Bge_Un_S:
case Code.Bgt:
case Code.Bgt_S:
case Code.Bgt_Un:
case Code.Bgt_Un_S:
case Code.Ble:
case Code.Ble_S:
case Code.Ble_Un:
case Code.Ble_Un_S:
case Code.Blt:
case Code.Blt_S:
case Code.Blt_Un:
case Code.Blt_Un_S:
case Code.Bne_Un:
case Code.Bne_Un_S:
case Code.Brfalse:
case Code.Brfalse_S:
case Code.Brtrue:
case Code.Brtrue_S:
instruction = new ConditionalBranch(untyped, index);
break;
case Code.Box:
instruction = new Box(untyped, index);
break;
case Code.Br:
case Code.Br_S:
case Code.Leave:
case Code.Leave_S:
instruction = new UnconditionalBranch(untyped, index);
break;
case Code.Call:
case Code.Callvirt:
instruction = new Call(untyped, index);
break;
case Code.Castclass:
case Code.Isinst:
instruction = new CastClass(untyped, index);
break;
case Code.Ceq:
instruction = new Ceq(untyped, index);
break;
case Code.Cgt:
case Code.Cgt_Un:
case Code.Clt:
case Code.Clt_Un:
instruction = new Compare(untyped, index);
break;
case Code.Conv_I1:
case Code.Conv_I2:
case Code.Conv_I4:
case Code.Conv_I8:
case Code.Conv_R4:
case Code.Conv_R8:
case Code.Conv_U4:
case Code.Conv_U8:
case Code.Conv_R_Un:
case Code.Conv_Ovf_I1_Un:
case Code.Conv_Ovf_I2_Un:
case Code.Conv_Ovf_I4_Un:
case Code.Conv_Ovf_I8_Un:
case Code.Conv_Ovf_U1_Un:
case Code.Conv_Ovf_U2_Un:
case Code.Conv_Ovf_U4_Un:
case Code.Conv_Ovf_U8_Un:
case Code.Conv_Ovf_I_Un:
case Code.Conv_Ovf_U_Un:
case Code.Conv_Ovf_I1:
case Code.Conv_Ovf_U1:
case Code.Conv_Ovf_I2:
case Code.Conv_Ovf_U2:
case Code.Conv_Ovf_I4:
case Code.Conv_Ovf_U4:
case Code.Conv_Ovf_I8:
case Code.Conv_Ovf_U8:
case Code.Conv_U2:
case Code.Conv_U1:
case Code.Conv_I:
case Code.Conv_Ovf_I:
case Code.Conv_Ovf_U:
case Code.Conv_U:
instruction = new Conv(untyped, index);
break;
case Code.Endfilter:
case Code.Endfinally:
case Code.Ret:
case Code.Rethrow:
instruction = new End(untyped, index);
break;
case Code.Initobj:
instruction = new InitObj(untyped, index);
break;
case Code.Ldarg_0:
case Code.Ldarg_1:
case Code.Ldarg_2:
case Code.Ldarg_3:
case Code.Ldarg:
case Code.Ldarg_S:
instruction = new LoadArg(method, untyped, index);
break;
case Code.Ldarga:
case Code.Ldarga_S:
instruction = new LoadArgAddress(method, untyped, index);
break;
case Code.Ldc_I4_M1:
case Code.Ldc_I4_0:
case Code.Ldc_I4_1:
case Code.Ldc_I4_2:
case Code.Ldc_I4_3:
case Code.Ldc_I4_4:
case Code.Ldc_I4_5:
case Code.Ldc_I4_6:
case Code.Ldc_I4_7:
case Code.Ldc_I4_8:
case Code.Ldc_I4_S:
case Code.Ldc_I4:
case Code.Ldc_I8:
instruction = new LoadConstantInt(untyped, index);
break;
case Code.Ldc_R4:
case Code.Ldc_R8:
instruction = new LoadConstantFloat(untyped, index);
break;
case Code.Ldelema:
case Code.Ldtoken:
instruction = new LoadPointer(untyped, index);
break;
case Code.Ldelem_I1:
case Code.Ldelem_U1:
case Code.Ldelem_I2:
case Code.Ldelem_U2:
case Code.Ldelem_I4:
case Code.Ldelem_U4:
case Code.Ldelem_I8:
case Code.Ldelem_I:
case Code.Ldelem_R4:
case Code.Ldelem_R8:
case Code.Ldelem_Ref:
case Code.Ldelem_Any:
case Code.Ldind_I1:
case Code.Ldind_U1:
case Code.Ldind_I2:
case Code.Ldind_U2:
case Code.Ldind_I4:
case Code.Ldind_U4:
case Code.Ldind_I8:
case Code.Ldind_I:
case Code.Ldind_R4:
case Code.Ldind_R8:
case Code.Ldind_Ref:
case Code.Ldlen:
instruction = new Load(untyped, index);
break;
case Code.Ldfld:
instruction = new LoadField(untyped, index);
break;
case Code.Ldflda:
instruction = new LoadFieldAddress(untyped, index);
break;
case Code.Ldftn:
case Code.Ldvirtftn:
instruction = new LoadFunctionAddress(untyped, index);
break;
case Code.Ldloc_0:
case Code.Ldloc_1:
case Code.Ldloc_2:
case Code.Ldloc_3:
case Code.Ldloc:
case Code.Ldloc_S:
instruction = new LoadLocal(m_symbols, method, untyped, index);
break;
case Code.Ldloca:
case Code.Ldloca_S:
instruction = new LoadLocalAddress(m_symbols, method, untyped, index);
break;
case Code.Ldnull:
instruction = new LoadNull(untyped, index);
break;
case Code.Ldsfld:
instruction = new LoadStaticField(untyped, index);
break;
case Code.Ldsflda:
instruction = new LoadStaticFieldAddress(untyped, index);
break;
case Code.Ldstr:
instruction = new LoadString(untyped, index);
break;
case Code.Newarr:
instruction = new NewArr(untyped, index);
break;
case Code.Newobj:
instruction = new NewObj(untyped, index);
break;
case Code.Starg:
case Code.Starg_S:
instruction = new StoreArg(method, untyped, index);
break;
case Code.Stelem_I:
case Code.Stelem_I1:
case Code.Stelem_I2:
case Code.Stelem_I4:
case Code.Stelem_I8:
case Code.Stelem_R4:
case Code.Stelem_R8:
case Code.Stelem_Ref:
case Code.Stelem_Any:
case Code.Stind_I:
case Code.Stind_I1:
case Code.Stind_I2:
case Code.Stind_I4:
case Code.Stind_I8:
case Code.Stind_R4:
case Code.Stind_R8:
case Code.Stobj:
instruction = new Store(untyped, index);
break;
case Code.Stfld:
instruction = new StoreField(untyped, index);
break;
case Code.Stloc_0:
case Code.Stloc_1:
case Code.Stloc_2:
case Code.Stloc_3:
case Code.Stloc:
case Code.Stloc_S:
instruction = new StoreLocal(m_symbols, method, untyped, index);
break;
case Code.Stsfld:
instruction = new StoreStaticField(untyped, index);
break;
case Code.Switch:
instruction = new Switch(untyped, index);
break;
case Code.Throw:
instruction = new Throw(untyped, index);
break;
case Code.Unbox:
case Code.Unbox_Any:
instruction = new Unbox(untyped, index);
break;
default:
instruction = new CatchAll(untyped, index);
break;
}
return(instruction);
}
// In general an Equals method will be either completely wrong or correct.
// But correct methods often have a lot of control flow with early returns
// which make them difficult to analyze. So, we'll be conservative and
// consider a method OK if it contains an early return or is check.
public void VisitReturn(End end)
{
if (m_needsCheck && !m_foundEarlyReturn && end.Index < m_info.Instructions.Length - 1 && m_offset < 0)
{
m_foundEarlyReturn = true;
Log.DebugLine(this, "early return {0:X2}", end.Untyped.Offset);
}
}