/// <summary>
/// Emits IL instructions that write a value to an instance field.
/// </summary>
/// <param name="codeGenerator">The current <see cref="CodeGenerator"/>.</param>
/// <param name="writeRef">If <B>true</B> the value being written is a <see cref="PhpReference"/>
/// instance, if <B>false</B> it is an <see cref="Object"/> instance.</param>
/// <returns>Delegate to a method that emits code to be executed when the actual value has been
/// loaded on the evaluation stack.</returns>
/// <remarks>
/// If the field could be resolved at compile time (because <see cref="VarLikeConstructUse.isMemberOf"/> is <c>$this</c> or a
/// variable is proved to be of a certain type by type analysis), direct field writing code is emitted.
/// Otherwise, <see cref="Operators.SetProperty"/> or <see cref="Operators.SetObjectProperty"/> call is emitted.
/// </remarks>
internal virtual AssignmentCallback EmitWriteField(CodeGenerator /*!*/ codeGenerator, bool writeRef)
{
ILEmitter il = codeGenerator.IL;
DirectVarUse direct_instance = isMemberOf as DirectVarUse;
if (direct_instance != null && direct_instance.IsMemberOf == null && direct_instance.VarName.IsThisVariableName)
{
return(EmitWriteFieldOfThis(codeGenerator, writeRef));
}
if (isMemberOf is ItemUse || isMemberOf is StaticFieldUse || isMemberOf.IsMemberOf != null)
{
// we are part of a chain
// Lengthen for hop over ->
codeGenerator.ChainBuilder.Lengthen();
FunctionCall funcCall = isMemberOf as FunctionCall;
if (funcCall == null)
{
isMemberOf.Emit(codeGenerator);
EmitName(codeGenerator);
}
else
{
codeGenerator.ChainBuilder.LoadAddressOfFunctionReturnValue = true;
isMemberOf.Emit(codeGenerator);
codeGenerator.ChainBuilder.RecastValueReturnedByFunctionCall();
EmitName(codeGenerator);
}
return(new AssignmentCallback(EmitCallSetObjectField));
}
else
{
return(delegate(CodeGenerator codeGen, PhpTypeCode stackTypeCode)
{
codeGen.ChainBuilder.Lengthen();
// CALL Operators.SetProperty(STACK,ref <instance>,<field name>,<handle>,<script context>);
isMemberOf.Emit(codeGen);
EmitName(codeGen);
codeGen.EmitLoadClassContext();
codeGen.EmitLoadScriptContext();
// invoke the operator
codeGen.IL.Emit(OpCodes.Call, Methods.Operators.SetProperty);
});
}
}
/// <summary>
/// Called when derived class visited.
/// </summary>
/// <param name="x"></param>
virtual public void VisitFunctionCall(FunctionCall x)
{
foreach (ActualParam p in x.CallSignature.Parameters)
VisitElement(p);
}
/// <summary>
/// Called when derived class visited.
/// </summary>
/// <param name="x"></param>
virtual public void VisitFunctionCall(FunctionCall x)
{
VisitVarLikeConstructUse(x);
foreach (ActualParam p in x.CallSignature.Parameters)
VisitElement(p);
}