public void DoStackAnalysis(Stack <Type> aStack, ref uint aStackOffset)
{
StackOffsetBeforeExecution = aStackOffset;
// if current instruction is the first instruction of a filter or catch statement, "push" the exception type now
if (CurrentExceptionRegion != null && (CurrentExceptionRegion.HandlerOffset == Position ||
(CurrentExceptionRegion.FilterOffset == Position && CurrentExceptionRegion.FilterOffset != 0)))
{
if (CurrentExceptionRegion.Kind != ExceptionRegionKind.Finally)
{
aStack.Push(typeof(object));
aStackOffset += ILOp.Align(ILOp.SizeOfType(typeof(object)), 4);
}
}
if (StackPopTypes.Length > aStack.Count)
{
throw new Exception(String.Format("OpCode {0} tries to pop more stuff from analytical stack than there is!", this));
}
var pos = 0;
foreach (var xPopItem in StackPopTypes)
{
var popped = aStack.Pop();
if (xPopItem is null)
{
StackPopTypes[pos] = popped;
}
else if (xPopItem != popped && xPopItem.IsAssignableTo(popped))
{
throw new Exception($"Tried to pop a {xPopItem} from the stack but found a {popped}");
}
aStackOffset -= ILOp.Align(ILOp.SizeOfType(popped), 4);
pos++;
}
DoInterpretStackTypes();
foreach (var xPushItem in StackPushTypes)
{
aStack.Push(xPushItem);
aStackOffset += ILOp.Align(ILOp.SizeOfType(xPushItem), 4);
}
}
public void InterpretStackTypes(IDictionary <int, ILOpCode> aOpCodes, Stack <Type> aStack, ref bool aSituationChanged, int aMaxRecursionDepth)
{
if (Processed)
{
ILInterpretationDebugLine(() => String.Format("{0} skipped for reinterpretation", this));
return;
}
Processed = true;
ILInterpretationDebugLine(() =>
{
var sb = new StringBuilder();
sb.AppendFormat("Interpreting {0}. StackCount = {1}. Contents: ", this, aStack.Count);
foreach (var item in aStack)
{
if (item == null)
{
sb.Append("**NULL**, ");
}
else
{
sb.AppendFormat("{0}, ", item.FullName);
}
}
return(sb.ToString().Trim(',', ' '));
});
if (aMaxRecursionDepth == 0)
{
throw new Exception("Safety Error: MaxRecursionDepth reached!");
}
if (StackOffsetBeforeExecution == null)
{
StackOffsetBeforeExecution = 0;
foreach (var item in aStack)
{
if (item == null)
{
StackOffsetBeforeExecution = null;
break;
}
StackOffsetBeforeExecution += ILOp.Align(ILOp.SizeOfType(item), 4);
}
}
// if current instruction is the first instruction of a catch statement, "push" the exception type now
if (CurrentExceptionHandler != null &&
CurrentExceptionHandler.HandlerOffset == Position)
{
if (CurrentExceptionHandler.Flags != SR.ExceptionHandlingClauseOptions.Finally)
{
aStack.Push(CurrentExceptionHandler.CatchType);
}
}
if (StackPopTypes.Length > aStack.Count)
{
throw new Exception(String.Format("OpCode {0} tries to pop more stuff from analytical stack than there is!", this));
}
for (int i = 0; i < StackPopTypes.Length; i++)
{
var xActualStackItem = aStack.ElementAt(i);
if (xActualStackItem == null)
{
continue;
}
if (StackPopTypes[i] == null)
{
StackPopTypes[i] = xActualStackItem;
aSituationChanged = true;
}
if (StackPopTypes[i] != xActualStackItem &&
!StackPopTypes[i].IsAssignableFrom(xActualStackItem) &&
!((StackPopTypes[i].IsPointer || StackPopTypes[i].IsByRef) && (xActualStackItem.IsPointer || xActualStackItem.IsByRef)))
{
throw new Exception(String.Format("OpCode {0} tries to pop item at stack position {1} with type {2}, but actual type is {3}",
this, i, StackPopTypes[i], xActualStackItem));
}
}
foreach (var xPopItem in StackPopTypes)
{
aStack.Pop();
}
try
{
DoInterpretStackTypes(ref aSituationChanged);
}
catch (Exception E)
{
throw new Exception("Error interpreting stacktypes for " + this, E);
}
foreach (var xPushItem in StackPushTypes)
{
aStack.Push(xPushItem);
}
DoInterpretNextInstructionStackTypes(aOpCodes, aStack, ref aSituationChanged, aMaxRecursionDepth);
}