private void ValidateTryCatchFinallyBlocks()
{
foreach (var kv in TryBlocks.AsEnumerable())
{
if (kv.Value.Item2 == -1)
{
throw
new SigilVerificationException(
"Unended ExceptionBlock " + kv.Key,
IL.Instructions(AllLocals)
);
}
}
foreach (var kv in CatchBlocks.AsEnumerable())
{
if (kv.Value.Item2 == -1)
{
throw new Exception("Invalid State, all ExceptionBlocks are ended but CatchBlock " + kv.Key + " isn't ended");
}
}
foreach (var kv in FinallyBlocks.AsEnumerable())
{
if (kv.Value.Item2 == -1)
{
throw new Exception("Invalid State, all ExceptionBlocks are ended but FinallyBlock " + kv.Key + " isn't ended");
}
}
}
/// <summary>
/// Transfers control to another method.
///
/// The parameters and calling convention of method must match the current one's.
///
/// The stack must be empty to jump.
///
/// Like the branching instructions, Jump cannot leave exception blocks.
/// </summary>
public Emit <DelegateType> Jump(MethodInfo method)
{
if (method == null)
{
throw new ArgumentNullException("method");
}
if (method.CallingConvention != CallingConventions)
{
throw new ArgumentException("Jump expected a calling convention of " + CallingConventions + ", found " + method.CallingConvention);
}
var paras = method.GetParameters();
if (paras.Length != ParameterTypes.Length)
{
throw new ArgumentException("Jump expected a method with " + ParameterTypes.Length + " parameters, found " + paras.Length);
}
if (!AllowsUnverifiableCIL)
{
FailUnverifiable("Jump");
}
if (CatchBlocks.Any(t => t.Value.Item2 == -1))
{
throw new InvalidOperationException("Jump cannot transfer control from a catch block");
}
if (FinallyBlocks.Any(t => t.Value.Item2 == -1))
{
throw new InvalidOperationException("Jump cannot transfer control from a finally block");
}
if (TryBlocks.Any(t => t.Value.Item2 == -1))
{
throw new InvalidOperationException("Jump cannot transfer control from an exception block");
}
UpdateState(Wrap(new[] { new StackTransition(0) }, "Jump"));
for (var i = 0; i < paras.Length; i++)
{
var shouldBe = paras[i].ParameterType;
var actuallyIs = ParameterTypes[i];
if (!shouldBe.IsAssignableFrom(actuallyIs))
{
throw new SigilVerificationException("Jump expected the #" + i + " parameter to be assignable from " + actuallyIs + ", but found " + shouldBe, IL.Instructions(AllLocals));
}
}
UpdateState(OpCodes.Jmp, method, TypeHelpers.EmptyTypes, Wrap(StackTransition.None(), "Jump"));
return(this);
}
/// <summary>
/// <para>Leave an exception or catch block, branching to the given label.</para>
/// <para>This instruction empties the stack.</para>
/// </summary>
public Emit <DelegateType> Leave(Label label)
{
if (label == null)
{
throw new ArgumentNullException("label");
}
if (((IOwned)label).Owner != this)
{
if (((IOwned)label).Owner is DisassembledOperations <DelegateType> )
{
return(Leave(label.Name));
}
FailOwnership(label);
}
if (!TryBlocks.Any(t => t.Value.Item2 == -1) && !CatchBlocks.Any(c => c.Value.Item2 == -1))
{
throw new InvalidOperationException("Leave can only be used within an exception or catch block");
}
// Note that Leave *always* nuked the stack; nothing survies exiting an exception block
UpdateOpCodeDelegate update;
UpdateState(OpCodes.Leave, label, Wrap(new[] { new StackTransition(new [] { typeof(PopAllType) }, TypeHelpers.EmptyTypes) }, "Leave"), out update);
Branches.Add(SigilTuple.Create(OpCodes.Leave, label, IL.Index));
BranchPatches[IL.Index] = SigilTuple.Create(label, update, OpCodes.Leave);
MustMark = true;
var valid = CurrentVerifiers.UnconditionalBranch(label);
if (!valid.Success)
{
throw new SigilVerificationException("Leave", valid, IL.Instructions(AllLocals));
}
return(this);
}
private void ValidateTryCatchFinallyBranches()
{
foreach (var branch in Branches.AsEnumerable())
{
var instr = BranchPatches[branch.Item3];
var toLabel = branch.Item2;
var fromIndex = branch.Item3;
var toIndex = Marks[toLabel];
var fromTryBlocks = TryBlocks.Where(t => fromIndex >= t.Value.Item1 && fromIndex <= t.Value.Item2).ToList();
var fromCatchBlocks = CatchBlocks.Where(c => fromIndex >= c.Value.Item1 && fromIndex <= c.Value.Item2).ToList();
var fromFinallyBlocks = FinallyBlocks.Where(f => fromIndex >= f.Value.Item1 && fromIndex <= f.Value.Item2).ToList();
var toTryBlocks = TryBlocks.Where(t => toIndex >= t.Value.Item1 && toIndex <= t.Value.Item2).ToList();
var toCatchBlocks = CatchBlocks.Where(c => toIndex >= c.Value.Item1 && toIndex <= c.Value.Item2).ToList();
var toFinallyBlocks = FinallyBlocks.Where(f => toIndex >= f.Value.Item1 && toIndex <= f.Value.Item2).ToList();
var fromTryBlock = fromTryBlocks.OrderByDescending(t => t.Value.Item1).Select(t => t.Key).FirstOrDefault();
var fromCatchBlock = fromCatchBlocks.OrderByDescending(c => c.Value.Item1).Select(c => c.Key).FirstOrDefault();
var fromFinallyBlock = fromFinallyBlocks.OrderByDescending(f => f.Value.Item1).Select(f => f.Key).FirstOrDefault();
var toTryBlock = toTryBlocks.OrderByDescending(t => t.Value.Item1).Select(t => t.Key).FirstOrDefault();
var toCatchBlock = toCatchBlocks.OrderByDescending(c => c.Value.Item1).Select(c => c.Key).FirstOrDefault();
var toFinallyBlock = toFinallyBlocks.OrderByDescending(f => f.Value.Item1).Select(f => f.Key).FirstOrDefault();
// Nothing funky going on, carry on
if (fromTryBlock == null && fromCatchBlock == null && fromFinallyBlock == null && toTryBlock == null && toCatchBlock == null && toFinallyBlock == null)
{
continue;
}
if (fromCatchBlock != null && toCatchBlock != fromCatchBlock)
{
if (instr.Item3 != OpCodes.Leave)
{
throw
new SigilVerificationException(
"Cannot branch from inside " + fromCatchBlock + " to outside, exit the ExceptionBlock first",
IL.Instructions(AllLocals)
);
}
}
if (fromFinallyBlock != null && toFinallyBlock != fromFinallyBlock)
{
throw
new SigilVerificationException(
"Cannot branch from inside " + fromFinallyBlock + " to outside, exit the ExceptionBlock first",
IL.Instructions(AllLocals)
);
}
if (toFinallyBlock != null && fromFinallyBlock != toFinallyBlock)
{
throw
new SigilVerificationException(
"Cannot branch into a FinallyBlock",
IL.Instructions(AllLocals)
);
}
if (fromTryBlock != null && toTryBlock != fromTryBlock)
{
if (instr.Item3 != OpCodes.Leave)
{
throw
new SigilVerificationException(
"Cannot branch from inside " + fromTryBlock + " to outside, exit the ExceptionBlock first",
IL.Instructions(AllLocals)
);
}
}
}
}
