/// <summary>
/// Emit IL instructions that load the value of array item at the stack and make a copy
/// of it if necessary.
/// </summary>
/// <param name="codeGenerator"></param>
/// <returns></returns>
/// <remarks>This node represents the item x=>&y in PHP notation. See <see cref="PHP.Core.AST.ArrayEx"/>
/// for more details.</remarks>
internal override PhpTypeCode EmitValue(CodeGenerator codeGenerator)
{
Debug.Assert(refToGet != null);
Statistics.AST.AddNode("Array.RefItem");
// Emit refToGet
return(refToGet.Emit(codeGenerator));
}
/// <include file='Doc/Nodes.xml' path='doc/method[@name="Emit"]/*'/>
internal override PhpTypeCode Emit(CodeGenerator codeGenerator)
{
Statistics.AST.AddNode("IncDecEx");
Debug.Assert(access == AccessType.Read || access == AccessType.None);
AccessType old_selector = codeGenerator.AccessSelector;
PhpTypeCode returned_typecode = PhpTypeCode.Void;
codeGenerator.AccessSelector = AccessType.Write;
codeGenerator.ChainBuilder.Create();
variable.Emit(codeGenerator);
codeGenerator.AccessSelector = AccessType.Read;
codeGenerator.ChainBuilder.Create();
variable.Emit(codeGenerator);
codeGenerator.ChainBuilder.End();
LocalBuilder old_value = null;
if (access == AccessType.Read && post)
{
old_value = codeGenerator.IL.DeclareLocal(Types.Object[0]);
// Save variable's value for later use
codeGenerator.IL.Emit(OpCodes.Dup);
codeGenerator.IL.Stloc(old_value);
}
if (this.inc)
{
// Increment
codeGenerator.IL.Emit(OpCodes.Call, Methods.Operators.Increment);
}
else
{
// Decrement
codeGenerator.IL.Emit(OpCodes.Call, Methods.Operators.Decrement);
}
codeGenerator.AccessSelector = AccessType.Write;
if (access == AccessType.Read)
{
if (post)
{
variable.EmitAssign(codeGenerator);
// Load original value (as was before operation)
codeGenerator.IL.Ldloc(old_value);
}
else
{
old_value = codeGenerator.IL.DeclareLocal(Types.Object[0]);
// pre-incrementation
// Load variable's value after operation
codeGenerator.IL.Emit(OpCodes.Dup);
codeGenerator.IL.Stloc(old_value);
variable.EmitAssign(codeGenerator);
codeGenerator.IL.Ldloc(old_value);
}
returned_typecode = PhpTypeCode.Object;
}
else
{
variable.EmitAssign(codeGenerator);
}
codeGenerator.AccessSelector = old_selector;
codeGenerator.ChainBuilder.End();
return(returned_typecode);
}