internal override void EmitUnset(CodeGenerator codeGenerator)
{
//Template: "unset(x)" x = null
Debug.Assert(access == AccessType.Read);
// Cases 1, 4, 5, 6, 9 never reached
Debug.Assert(codeGenerator.ChainBuilder.IsMember == false);
// Case 3 never reached
Debug.Assert(codeGenerator.ChainBuilder.IsArrayItem == false);
codeGenerator.ChainBuilder.QuietRead = true;
// 2, 7, 8
if (this.isMemberOf != null)
{
// 2: $b->a
// 8: b[]->a
codeGenerator.ChainBuilder.Create();
codeGenerator.ChainBuilder.Begin();
codeGenerator.ChainBuilder.QuietRead = true;
EmitUnsetField(codeGenerator);
codeGenerator.ChainBuilder.End();
return;
}
// 7: $a
// Check if the variable is auto-global
ILEmitter il = codeGenerator.IL;
if (codeGenerator.VariableIsAutoGlobal(varName))
{
codeGenerator.EmitAutoGlobalStorePrepare(varName);
il.Emit(OpCodes.Ldnull);
codeGenerator.EmitAutoGlobalStoreAssign();
return;
}
// Unset this variable
if (codeGenerator.OptimizedLocals)
{
// Template:
// unset(x) x = null
// unset(p) p.value = null <- this case isn't valid. When p is reference just create a new PhpReference
VariablesTable.Entry entry = codeGenerator.CurrentVariablesTable[varName];
if (entry.IsPhpReference)
{
il.Emit(OpCodes.Newobj, Constructors.PhpReference_Void);
entry.Variable.EmitStore(il);
}
else
{
il.Emit(OpCodes.Ldnull);
entry.Variable.EmitStore(il);
}
}
else
{
// CALL Operators.UnsetVariable(<script context>, <local variable table>, <variable name>);
codeGenerator.EmitLoadScriptContext();
codeGenerator.EmitLoadRTVariablesTable();
EmitName(codeGenerator);
il.Emit(OpCodes.Call, Methods.Operators.UnsetVariable);
}
}
internal override void EmitStoreAssign(CodeGenerator codeGenerator)
{
ILEmitter il = codeGenerator.IL;
if (varName.IsThisVariableName)
{
// emit error throwing code
il.Emit(OpCodes.Pop);
codeGenerator.EmitPhpException(Methods.PhpException.CannotReassignThis);
}
else if (codeGenerator.VariableIsAutoGlobal(varName))
{
// Check if the variable is auto-global
codeGenerator.EmitAutoGlobalStoreAssign();
}
else if (codeGenerator.OptimizedLocals)
{
// Template:
// "WRITE($x,value);"
// **** // if specified variable is of type PhpReference
// ldloc local
// **** // Otherwise do nothing
VariablesTable.Entry entry = codeGenerator.CurrentVariablesTable[varName];
if (entry.IsPhpReference)
il.Emit(OpCodes.Stfld, Fields.PhpReference_Value);
else
entry.Variable.EmitStore(il);
}
else
{
// CALL Operators.SetVariable(STACK:table,STACK:name,STACK:value);
il.Emit(OpCodes.Call, Methods.Operators.SetVariable);
}
}
