/// <summary>
/// Emits IL instructions that ensure that the specified variable is an instance of <see cref="PhpObject"/>.
/// </summary>
/// <param name="variable">Variable that should be examined.</param>
/// <remarks>
/// This method is used in operators chains. Nothing is expected on the evaluation stack.
/// If the specified variable is an instance of <see cref="PhpObject"/>
/// it is left on the evaluation stack. Otherwise the control is transfered to the end of
/// the chain.
/// </remarks>
public void EmitEnsureVariableIsObject(SimpleVarUse variable)
{
ILEmitter il = codeGenerator.IL;
DirectVarUse direct_variable = variable as DirectVarUse;
if (direct_variable != null && direct_variable.VarName.IsThisVariableName)
{
// special treatment of $this
switch (codeGenerator.LocationStack.LocationType)
{
case LocationTypes.GlobalCode:
{
// load $this from one of Main's arguments and check for null
Label this_non_null = il.DefineLabel();
codeGenerator.EmitLoadSelf();
il.Emit(OpCodes.Brtrue_S, this_non_null);
codeGenerator.EmitPhpException(Methods.PhpException.ThisUsedOutOfObjectContext);
il.Emit(OpCodes.Br, TopChain.ErrorLabel);
il.MarkLabel(this_non_null, true);
codeGenerator.EmitLoadSelf();
break;
}
case LocationTypes.FunctionDecl:
{
// always throws error
codeGenerator.EmitPhpException(Methods.PhpException.ThisUsedOutOfObjectContext);
il.Emit(OpCodes.Br, TopChain.ErrorLabel);
break;
}
case LocationTypes.MethodDecl:
{
CompilerLocationStack.MethodDeclContext context = codeGenerator.LocationStack.PeekMethodDecl();
if (context.Method.IsStatic)
{
// always throws error
codeGenerator.EmitPhpException(Methods.PhpException.ThisUsedOutOfObjectContext);
il.Emit(OpCodes.Br, TopChain.ErrorLabel);
}
else
{
// arg0 or <proxy> in instance methods
codeGenerator.EmitLoadSelf();
}
break;
}
default:
Debug.Assert(false, "Invalid location type.");
break;
}
}
else
{
// Template: PhpObject EnsureVariableIsObject(ref object,ScriptContext)
// Load variable's address
// if (variable is FunctionCall)
// {
// variable.Emit(this);
// EmitLoadScriptContext();
// il.Emit(OpCodes.Call, Methods.Operators.EnsureVariableIsObject);
// // Store the changed destVar into table of variables (do nothing in optimalized functions)
// }
// else
// {
variable.EmitLoadAddress(codeGenerator);
codeGenerator.EmitLoadScriptContext();
il.Emit(OpCodes.Call, Methods.Operators.EnsureVariableIsObject);
// Store the changed destVar into table of variables (do nothing in optimalized functions)
variable.EmitLoadAddress_StoreBack(codeGenerator);
// }
EmitErrorCheck(false);
}
}
/// <summary>
/// Emits IL instructions that ensure that the specified variable is an instance of <see cref="PhpArray"/>.
/// </summary>
/// <param name="variable">Variable's name-index to a table of identifiers.</param>
/// <remarks>
/// This method is used in operators chains. Nothing is expected on the evaluation stack.
/// If the specified variable is an instance of <see cref="PhpArray"/>
/// it is left on the evaluation stack. Otherwise the control is transfered to the end of
/// the chain.
/// </remarks>
public void EmitEnsureVariableIsArray(SimpleVarUse variable)
{
// Template: PhpArray EnsureVariableIsArray(ref object)
// Load variable's address
//this.EmitVariableLoadAddress(variable);
variable.EmitLoadAddress(codeGenerator);
codeGenerator.IL.Emit(OpCodes.Call, Methods.Operators.EnsureVariableIsArray);
// Store the changed destVar into table of variables (do nothing in optimalized functions)
variable.EmitLoadAddress_StoreBack(codeGenerator);
EmitErrorCheck(true);
}