/// <summary>
/// Emits code to load a reference to a variable onto an evaluation stack. Supports operators chaining.
/// </summary>
/// <param name="codeGenerator"></param>
private PhpTypeCode EmitNodeReadRef(CodeGenerator codeGenerator)
{
ChainBuilder chain = codeGenerator.ChainBuilder;
LocalBuilder local = codeGenerator.IL.DeclareLocal(typeof(object));
// Case 3: a_[x]_[x] never reached
Debug.Assert(chain.IsArrayItem == false, "ReadRef access shouldn't be set to array subchain nodes");
// Case 4,5 never reached
// 4: a[x]->...
// 5: ...->a[]->...
Debug.Assert(chain.IsMember == false);
// 1, 2, 6, 7
if (this.isMemberOf != null)
{
// last node of the field chain //
// 6 , 7: ...->a[]_[]_ , ...->a_[]_
chain.Create();
chain.Begin();
if (this.isMemberOf is FunctionCall)
{
chain.LoadAddressOfFunctionReturnValue = true;
}
chain.SetObjectForLazyEmit(this);
// let's emit the array subchain followed by the GetArrayItemRef:
chain.IsArrayItem = true;
chain.IsLastMember = false;
chain.Lengthen(); // for own []
chain.EmitGetArrayItemRef(array, index);
chain.IsArrayItem = false;
chain.EndRef();
return(PhpTypeCode.PhpReference);
}
// 1, 2
if (array is ItemUse || array is DirectStFldUse || array is IndirectStFldUse)
{
// we are at the beginning of the field chain //
// 2: a[]_[]_
chain.Create();
chain.Begin();
chain.IsArrayItem = true;
chain.IsLastMember = true;
chain.Lengthen();
chain.EmitGetArrayItemRef(array, index);
chain.IsArrayItem = false;
chain.EndRef();
return(PhpTypeCode.PhpReference);
}
// no chains //
// 1: a_[x]_
return(chain.EmitGetItemRef((SimpleVarUse)array, index));
}