private void ProcessOperations(IMethodBody methodBody) {
List<IOperation> operations = ((methodBody.Operations == null) ? new List<IOperation>(): new List<IOperation>(methodBody.Operations));
int count = operations.Count;
ILGenerator generator = new ILGenerator(this.host, methodBody.MethodDefinition);
if (this.pdbReader != null) {
foreach (var ns in this.pdbReader.GetNamespaceScopes(methodBody)) {
foreach (var uns in ns.UsedNamespaces)
generator.UseNamespace(uns.NamespaceName.Value);
}
}
this.currentGenerator = generator;
this.scopeEnumerator = this.pdbReader == null ? null : this.pdbReader.GetLocalScopes(methodBody).GetEnumerator();
this.scopeEnumeratorIsValid = this.scopeEnumerator != null && this.scopeEnumerator.MoveNext();
var methodName = MemberHelper.GetMemberSignature(methodBody.MethodDefinition, NameFormattingOptions.SmartTypeName);
#region Record all offsets that appear as part of an exception handler
Dictionary<uint, bool> offsetsUsedInExceptionInformation = new Dictionary<uint, bool>();
foreach (var exceptionInfo in methodBody.OperationExceptionInformation??Enumerable<IOperationExceptionInformation>.Empty) {
uint x = exceptionInfo.TryStartOffset;
if (!offsetsUsedInExceptionInformation.ContainsKey(x)) offsetsUsedInExceptionInformation.Add(x, true);
x = exceptionInfo.TryEndOffset;
if (!offsetsUsedInExceptionInformation.ContainsKey(x)) offsetsUsedInExceptionInformation.Add(x, true);
x = exceptionInfo.HandlerStartOffset;
if (!offsetsUsedInExceptionInformation.ContainsKey(x)) offsetsUsedInExceptionInformation.Add(x, true);
x = exceptionInfo.HandlerEndOffset;
if (!offsetsUsedInExceptionInformation.ContainsKey(x)) offsetsUsedInExceptionInformation.Add(x, true);
if (exceptionInfo.HandlerKind == HandlerKind.Filter) {
x = exceptionInfo.FilterDecisionStartOffset;
if (!offsetsUsedInExceptionInformation.ContainsKey(x)) offsetsUsedInExceptionInformation.Add(x, true);
}
}
#endregion Record all offsets that appear as part of an exception handler
Dictionary<uint, ILGeneratorLabel> offset2Label = new Dictionary<uint, ILGeneratorLabel>();
#region Pass 1: Make a label for each branch target
for (int i = 0; i < count; i++) {
IOperation op = operations[i];
switch (op.OperationCode) {
case OperationCode.Beq:
case OperationCode.Bge:
case OperationCode.Bge_Un:
case OperationCode.Bgt:
case OperationCode.Bgt_Un:
case OperationCode.Ble:
case OperationCode.Ble_Un:
case OperationCode.Blt:
case OperationCode.Blt_Un:
case OperationCode.Bne_Un:
case OperationCode.Br:
case OperationCode.Brfalse:
case OperationCode.Brtrue:
case OperationCode.Leave:
case OperationCode.Beq_S:
case OperationCode.Bge_S:
case OperationCode.Bge_Un_S:
case OperationCode.Bgt_S:
case OperationCode.Bgt_Un_S:
case OperationCode.Ble_S:
case OperationCode.Ble_Un_S:
case OperationCode.Blt_S:
case OperationCode.Blt_Un_S:
case OperationCode.Bne_Un_S:
case OperationCode.Br_S:
case OperationCode.Brfalse_S:
case OperationCode.Brtrue_S:
case OperationCode.Leave_S:
uint x = (uint)op.Value;
if (!offset2Label.ContainsKey(x))
offset2Label.Add(x, new ILGeneratorLabel());
break;
case OperationCode.Switch:
uint[] offsets = op.Value as uint[];
foreach (var offset in offsets) {
if (!offset2Label.ContainsKey(offset))
offset2Label.Add(offset, new ILGeneratorLabel());
}
break;
default:
break;
}
}
#endregion Pass 1: Make a label for each branch target
#region Pass 2: Emit each operation, along with labels
for (int i = 0; i < count; i++) {
IOperation op = operations[i];
ILGeneratorLabel label;
this.EmitDebugInformationFor(op);
#region Mark operation if it is a label for a branch
if (offset2Label.TryGetValue(op.Offset, out label)) {
generator.MarkLabel(label);
}
#endregion Mark operation if it is a label for a branch
#region Mark operation if it is pointed to by an exception handler
bool ignore;
uint offset = op.Offset;
if (offsetsUsedInExceptionInformation.TryGetValue(offset, out ignore)) {
foreach (var exceptionInfo in methodBody.OperationExceptionInformation) {
if (offset == exceptionInfo.TryStartOffset)
generator.BeginTryBody();
// Never need to do anthing when offset == exceptionInfo.TryEndOffset because
// we pick up an EndTryBody from the HandlerEndOffset below
// generator.EndTryBody();
if (offset == exceptionInfo.HandlerStartOffset) {
switch (exceptionInfo.HandlerKind) {
case HandlerKind.Catch:
generator.BeginCatchBlock(exceptionInfo.ExceptionType);
break;
case HandlerKind.Fault:
generator.BeginFaultBlock();
break;
case HandlerKind.Filter:
generator.BeginFilterBody();
break;
case HandlerKind.Finally:
generator.BeginFinallyBlock();
break;
}
}
if (exceptionInfo.HandlerKind == HandlerKind.Filter && offset == exceptionInfo.FilterDecisionStartOffset) {
generator.BeginFilterBlock();
}
if (offset == exceptionInfo.HandlerEndOffset)
generator.EndTryBody();
}
}
#endregion Mark operation if it is pointed to by an exception handler
#region Emit operation along with any injection
switch (op.OperationCode) {
#region Branches
case OperationCode.Beq:
case OperationCode.Bge:
case OperationCode.Bge_Un:
case OperationCode.Bgt:
case OperationCode.Bgt_Un:
case OperationCode.Ble:
case OperationCode.Ble_Un:
case OperationCode.Blt:
case OperationCode.Blt_Un:
case OperationCode.Bne_Un:
case OperationCode.Br:
case OperationCode.Brfalse:
case OperationCode.Brtrue:
case OperationCode.Leave:
case OperationCode.Beq_S:
case OperationCode.Bge_S:
case OperationCode.Bge_Un_S:
case OperationCode.Bgt_S:
case OperationCode.Bgt_Un_S:
case OperationCode.Ble_S:
case OperationCode.Ble_Un_S:
case OperationCode.Blt_S:
case OperationCode.Blt_Un_S:
case OperationCode.Bne_Un_S:
case OperationCode.Br_S:
case OperationCode.Brfalse_S:
case OperationCode.Brtrue_S:
case OperationCode.Leave_S:
generator.Emit(ILGenerator.LongVersionOf(op.OperationCode), offset2Label[(uint)op.Value]);
break;
case OperationCode.Switch:
uint[] offsets = op.Value as uint[];
ILGeneratorLabel[] labels = new ILGeneratorLabel[offsets.Length];
for (int j = 0, n = offsets.Length; j < n; j++) {
labels[j] = offset2Label[offsets[j]];
}
generator.Emit(OperationCode.Switch, labels);
break;
#endregion Branches
#region Everything else
case OperationCode.Stloc_0:
case OperationCode.Stloc_1:
case OperationCode.Stloc_2:
case OperationCode.Stloc_3:
generator.Emit(op.OperationCode);
EmitStoreLocal(generator, op);
break;
case OperationCode.Stloc:
case OperationCode.Stloc_S:
generator.Emit(op.OperationCode, op.Value);
EmitStoreLocal(generator, op);
break;
default:
if (op.Value == null) {
generator.Emit(op.OperationCode);
break;
}
var typeCode = System.Convert.GetTypeCode(op.Value);
switch (typeCode) {
case TypeCode.Byte:
generator.Emit(op.OperationCode, (byte)op.Value);
break;
case TypeCode.Double:
generator.Emit(op.OperationCode, (double)op.Value);
break;
case TypeCode.Int16:
generator.Emit(op.OperationCode, (short)op.Value);
break;
case TypeCode.Int32:
generator.Emit(op.OperationCode, (int)op.Value);
break;
case TypeCode.Int64:
generator.Emit(op.OperationCode, (long)op.Value);
break;
case TypeCode.Object:
IFieldReference fieldReference = op.Value as IFieldReference;
if (fieldReference != null) {
generator.Emit(op.OperationCode, this.Rewrite(fieldReference));
break;
}
ILocalDefinition localDefinition = op.Value as ILocalDefinition;
if (localDefinition != null) {
generator.Emit(op.OperationCode, localDefinition);
break;
}
IMethodReference methodReference = op.Value as IMethodReference;
if (methodReference != null) {
generator.Emit(op.OperationCode, this.Rewrite(methodReference));
break;
}
IParameterDefinition parameterDefinition = op.Value as IParameterDefinition;
if (parameterDefinition != null) {
generator.Emit(op.OperationCode, parameterDefinition);
break;
}
ISignature signature = op.Value as ISignature;
if (signature != null) {
generator.Emit(op.OperationCode, signature);
break;
}
ITypeReference typeReference = op.Value as ITypeReference;
if (typeReference != null) {
generator.Emit(op.OperationCode, this.Rewrite(typeReference));
break;
}
throw new ILMutatorException("Should never get here: no other IOperation argument types should exist");
case TypeCode.SByte:
generator.Emit(op.OperationCode, (sbyte)op.Value);
break;
case TypeCode.Single:
generator.Emit(op.OperationCode, (float)op.Value);
break;
case TypeCode.String:
generator.Emit(op.OperationCode, (string)op.Value);
break;
default:
// The other cases are the other enum values that TypeCode has.
// But no other argument types should be in the Operations. ILGenerator cannot handle anything else,
// so such IOperations should never exist.
//case TypeCode.Boolean:
//case TypeCode.Char:
//case TypeCode.DateTime:
//case TypeCode.DBNull:
//case TypeCode.Decimal:
//case TypeCode.Empty: // this would be the value for null, but the case when op.Value is null is handled before the switch statement
//case TypeCode.UInt16:
//case TypeCode.UInt32:
//case TypeCode.UInt64:
throw new ILMutatorException("Should never get here: no other IOperation argument types should exist");
}
break;
#endregion Everything else
}
#endregion Emit operation along with any injection
}
while (generator.InTryBody)
generator.EndTryBody();
while (this.scopeStack.Count > 0) {
this.currentGenerator.EndScope();
this.scopeStack.Pop();
}
#endregion Pass 2: Emit each operation, along with labels
}