private void InsertSetMethodCallIntoPropertySetter(
PropertyDefinition propertyDefinition,
MethodReference methodReference,
ICustomAttribute attribute)
{
TypeReference methodDeclaringType = methodReference.DeclaringType;
MethodBody methodBody = propertyDefinition.SetMethod.Body;
Collection <Instruction> instructions = methodBody.Instructions;
FieldReference backingField = propertyDefinition.FindBackingField();
List <Instruction> storeInstructions = instructions.Where(
instruction => instruction.OpCode == OpCodes.Stfld &&
(instruction.Operand as FieldReference)?.FullName == backingField.FullName)
.ToList();
foreach (Instruction storeInstruction in storeInstructions)
{
Instruction targetInstruction;
int instructionIndex;
bool needsPlayingCheck = _isCompilingForEditor;
bool needsActiveAndEnabledCheck = methodDeclaringType.Resolve().IsSubclassOf(_behaviourReference);
/*
* if (Application.isPlaying) // Only if compiling for Editor
* {
* if (this.isActiveAndEnabled) // Only if in a Behaviour
* {
* this.Method();
* }
* }
*/
bool IsPlayingCheck(Instruction instruction) =>
instruction.OpCode == OpCodes.Call &&
(instruction.Operand as MethodReference)?.FullName
== _isApplicationPlayingGetterReference.FullName;
bool IsActiveAndEnabledCheck(Instruction instruction) =>
instruction.OpCode == OpCodes.Call &&
(instruction.Operand as MethodReference)?.FullName
== _isActiveAndEnabledGetterReference.FullName;
if (attribute.AttributeType.FullName == _fullBeforeChangeAttributeName)
{
targetInstruction = storeInstruction.Previous.Previous;
instructionIndex = instructions.IndexOf(targetInstruction) - 1;
Instruction testInstruction = targetInstruction.Previous;
void TryFindExistingCheck(ref bool needsCheck, Func <Instruction, bool> predicate)
{
if (!needsCheck)
{
return;
}
while (testInstruction != null)
{
if (predicate(testInstruction))
{
needsCheck = false;
return;
}
testInstruction = testInstruction.Previous;
}
while (testInstruction != null &&
(testInstruction.OpCode == OpCodes.Brfalse ||
testInstruction.OpCode == OpCodes.Brfalse_S))
{
testInstruction = testInstruction.Next;
}
if (testInstruction != null)
{
instructionIndex = instructions.IndexOf(testInstruction) - 1;
}
}
TryFindExistingCheck(ref needsActiveAndEnabledCheck, IsActiveAndEnabledCheck);
TryFindExistingCheck(ref needsPlayingCheck, IsPlayingCheck);
}
else
{
targetInstruction = storeInstruction.Next;
instructionIndex = instructions.IndexOf(targetInstruction) - 1;
Instruction testInstruction = storeInstruction.Next;
void TryFindExistingCheck(ref bool needsCheck, Func <Instruction, bool> predicate)
{
if (!needsCheck)
{
return;
}
while (testInstruction != null)
{
if (predicate(testInstruction))
{
needsCheck = false;
instructionIndex = instructions.IndexOf(testInstruction) + 1;
return;
}
testInstruction = testInstruction.Next;
}
}
TryFindExistingCheck(ref needsPlayingCheck, IsPlayingCheck);
TryFindExistingCheck(ref needsActiveAndEnabledCheck, IsActiveAndEnabledCheck);
}
if (needsPlayingCheck)
{
// Call Application.isPlaying getter
instructions.Insert(
++instructionIndex,
Instruction.Create(OpCodes.Call, _isApplicationPlayingGetterReference));
// Bail out if false
instructions.Insert(++instructionIndex, Instruction.Create(OpCodes.Brfalse, targetInstruction));
}
if (needsActiveAndEnabledCheck)
{
// Load this (for getter call)
instructions.Insert(++instructionIndex, Instruction.Create(OpCodes.Ldarg_0));
// Call Behaviour.isActiveAndEnabled getter
instructions.Insert(
++instructionIndex,
Instruction.Create(OpCodes.Call, _isActiveAndEnabledGetterReference));
// Bail out if false
instructions.Insert(++instructionIndex, Instruction.Create(OpCodes.Brfalse, targetInstruction));
}
TypeDefinition definitionDeclaringType = propertyDefinition.DeclaringType;
if (methodDeclaringType.FullName != definitionDeclaringType.FullName)
{
MethodDefinition baseMethodDefinition =
definitionDeclaringType.Methods.FirstOrDefault(
definition => definition.FullName == methodReference.FullName);
if (baseMethodDefinition == null)
{
MethodDefinition methodDefinition = methodReference.Resolve();
baseMethodDefinition = new MethodDefinition(
methodReference.Name,
methodDefinition.Attributes,
methodReference.ReturnType);
baseMethodDefinition.CustomAttributes.Add(
new CustomAttribute(_compilerGeneratedAttributeConstructorReference));
definitionDeclaringType.Methods.Add(baseMethodDefinition);
// Return
baseMethodDefinition.Body.Instructions.Add(Instruction.Create(OpCodes.Ret));
if (!baseMethodDefinition.IsFamily)
{
baseMethodDefinition.IsFamily = true;
}
if (!baseMethodDefinition.IsVirtual && !baseMethodDefinition.IsNewSlot)
{
baseMethodDefinition.IsNewSlot = true;
}
baseMethodDefinition.IsFinal = false;
baseMethodDefinition.IsVirtual = true;
baseMethodDefinition.IsHideBySig = true;
methodDefinition.IsPrivate = baseMethodDefinition.IsPrivate;
methodDefinition.IsFamily = baseMethodDefinition.IsFamily;
methodDefinition.IsFamilyAndAssembly = baseMethodDefinition.IsFamilyAndAssembly;
methodDefinition.IsFinal = false;
methodDefinition.IsVirtual = true;
methodDefinition.IsNewSlot = false;
methodDefinition.IsReuseSlot = true;
methodDefinition.IsHideBySig = true;
LogInfo(
$"Changed the method '{methodDefinition.FullName}' to override the"
+ $" newly added base method '{baseMethodDefinition.FullName}'.");
}
methodReference = baseMethodDefinition;
}
// Load this (for method call)
instructions.Insert(++instructionIndex, Instruction.Create(OpCodes.Ldarg_0));
// Call method
instructions.Insert(
++instructionIndex,
Instruction.Create(OpCodes.Callvirt, methodReference.CreateGenericMethodIfNeeded()));
methodBody.OptimizeMacros();
LogInfo(
$"Inserted a call to the method '{methodReference.FullName}' into"
+ $" the setter of the property '{propertyDefinition.FullName}'.");
}
}