public InstrumentationHelper UntilExit(InstrumentationPoint ip)
{
List <Instruction> closingInstructions = InstrumentationHelperClosingInstructions(ip);
InstrumentationPositionInMethodHelper.WeaveInstructionsAtMethodExit(ip.instrumentationPointMethodDefinition, closingInstructions);
return(_Save(ip));
}
public InstrumentationHelper StartingAtExit(InstrumentationPoint ip)
{
InstrumentationHelperInitialization(ip);
List <Instruction> openingInstructions = InstrumentationHelperOpeningInstructions(ip);
InstrumentationPositionInMethodHelper.WeaveInstructionsAtMethodExit(ip.instrumentationPointMethodDefinition, openingInstructions);
return(_Save(ip));
}
protected override void InstrumentationHelperInitialization(
InstrumentationPoint ip
)
{
// TODO --- need a more graceful way to name these
mSnapshotFieldDefinition =
new FieldDefinition(
"snapshot_" + ip.Name,
FieldAttributes.Public,
ip.instrumentationPointTypeDefinition.Module.Import(typeof(WovenSnapshot))
);
ip.instrumentationPointTypeDefinition.Fields.Add(mSnapshotFieldDefinition);
// TODO might want a special case of this for constructors, static classes/constructors get messy
List <Instruction> wovenFieldInitializationInstructions = new List <Instruction>();
MethodDefinition ipParentTypeConstructor = ip.instrumentationPointTypeDefinition.Methods.Single(m => m.Name == ".ctor");
FieldDefinition snapshotTargetField =
ip.instrumentationPointTypeDefinition.Fields
.Single(f => f.Name == snapshotFieldName);
ILProcessor ctorIlp = ipParentTypeConstructor.Body.GetILProcessor();
// Load self
wovenFieldInitializationInstructions.Add(
ctorIlp.Create(OpCodes.Ldarg_0)
);
// Load arguments to WovenSnapshot constructor: IP Name
wovenFieldInitializationInstructions.Add(
ctorIlp.Create(OpCodes.Ldstr, ip.Name)
);
// Load arguments to WovenSnapshot constructor: Target field
wovenFieldInitializationInstructions.Add(
ctorIlp.Create(OpCodes.Ldarg_0)
);
wovenFieldInitializationInstructions.Add(
ctorIlp.Create(OpCodes.Ldfld, snapshotTargetField)
);
wovenFieldInitializationInstructions.Add(
ctorIlp.Create(OpCodes.Box, snapshotTargetField.FieldType)
);
// Create with constructor call and store into field
wovenFieldInitializationInstructions.Add(
ctorIlp.Create(
OpCodes.Newobj,
ipParentTypeConstructor.Module.Import(
typeof(WovenSnapshot).GetConstructor(new Type[] { typeof(string), typeof(object) }))
)
);
wovenFieldInitializationInstructions.Add(
ctorIlp.Create(OpCodes.Stfld, mSnapshotFieldDefinition)
);
InstrumentationPositionInMethodHelper.WeaveInstructionsAtMethodExit(ipParentTypeConstructor, wovenFieldInitializationInstructions);
}