void
AcpiDsDeleteResultIfNotUsed (
ACPI_PARSE_OBJECT *Op,
ACPI_OPERAND_OBJECT *ResultObj,
ACPI_WALK_STATE *WalkState)
{
ACPI_OPERAND_OBJECT *ObjDesc;
ACPI_STATUS Status;
ACPI_FUNCTION_TRACE_PTR (DsDeleteResultIfNotUsed, ResultObj);
if (!Op)
{
ACPI_ERROR ((AE_INFO, "Null Op"));
return_VOID;
}
if (!ResultObj)
{
return_VOID;
}
if (!AcpiDsIsResultUsed (Op, WalkState))
{
/* Must pop the result stack (ObjDesc should be equal to ResultObj) */
Status = AcpiDsResultPop (&ObjDesc, WalkState);
if (ACPI_SUCCESS (Status))
{
AcpiUtRemoveReference (ResultObj);
}
}
return_VOID;
}
ACPI_STATUS
AcpiPsNextParseState (
ACPI_WALK_STATE *WalkState,
ACPI_PARSE_OBJECT *Op,
ACPI_STATUS CallbackStatus)
{
ACPI_PARSE_STATE *ParserState = &WalkState->ParserState;
ACPI_STATUS Status = AE_CTRL_PENDING;
ACPI_FUNCTION_TRACE_PTR (PsNextParseState, Op);
switch (CallbackStatus)
{
case AE_CTRL_TERMINATE:
/*
* A control method was terminated via a RETURN statement.
* The walk of this method is complete.
*/
ParserState->Aml = ParserState->AmlEnd;
Status = AE_CTRL_TERMINATE;
break;
case AE_CTRL_BREAK:
ParserState->Aml = WalkState->AmlLastWhile;
WalkState->ControlState->Common.Value = FALSE;
Status = AE_CTRL_BREAK;
break;
case AE_CTRL_CONTINUE:
ParserState->Aml = WalkState->AmlLastWhile;
Status = AE_CTRL_CONTINUE;
break;
case AE_CTRL_PENDING:
ParserState->Aml = WalkState->AmlLastWhile;
break;
#if 0
case AE_CTRL_SKIP:
ParserState->Aml = ParserState->Scope->ParseScope.PkgEnd;
Status = AE_OK;
break;
#endif
case AE_CTRL_TRUE:
/*
* Predicate of an IF was true, and we are at the matching ELSE.
* Just close out this package
*/
ParserState->Aml = AcpiPsGetNextPackageEnd (ParserState);
Status = AE_CTRL_PENDING;
break;
case AE_CTRL_FALSE:
/*
* Either an IF/WHILE Predicate was false or we encountered a BREAK
* opcode. In both cases, we do not execute the rest of the
* package; We simply close out the parent (finishing the walk of
* this branch of the tree) and continue execution at the parent
* level.
*/
ParserState->Aml = ParserState->Scope->ParseScope.PkgEnd;
/* In the case of a BREAK, just force a predicate (if any) to FALSE */
WalkState->ControlState->Common.Value = FALSE;
Status = AE_CTRL_END;
break;
case AE_CTRL_TRANSFER:
/* A method call (invocation) -- transfer control */
Status = AE_CTRL_TRANSFER;
WalkState->PrevOp = Op;
WalkState->MethodCallOp = Op;
WalkState->MethodCallNode = (Op->Common.Value.Arg)->Common.Node;
/* Will return value (if any) be used by the caller? */
WalkState->ReturnUsed = AcpiDsIsResultUsed (Op, WalkState);
break;
default:
Status = CallbackStatus;
if ((CallbackStatus & AE_CODE_MASK) == AE_CODE_CONTROL)
{
Status = AE_OK;
}
break;
}
return_ACPI_STATUS (Status);
}
static ACPI_STATUS
AcpiPsNextParseState (
ACPI_WALK_STATE *WalkState,
ACPI_PARSE_OBJECT *Op,
ACPI_STATUS CallbackStatus)
{
ACPI_PARSE_STATE *ParserState = WalkState->ParserState;
ACPI_STATUS Status = AE_CTRL_PENDING;
UINT8 *Start;
UINT32 PackageLength;
FUNCTION_TRACE_PTR ("PsNextParseState", Op);
switch (CallbackStatus)
{
case AE_CTRL_TERMINATE:
/*
* A control method was terminated via a RETURN statement.
* The walk of this method is complete.
*/
ParserState->Aml = ParserState->AmlEnd;
Status = AE_CTRL_TERMINATE;
break;
case AE_CTRL_PENDING:
/*
* Predicate of a WHILE was true and the loop just completed an
* execution. Go back to the start of the loop and reevaluate the
* predicate.
*/
/* TBD: How to handle a break within a while. */
/* This code attempts it */
ParserState->Aml = WalkState->AmlLastWhile;
break;
case AE_CTRL_TRUE:
/*
* Predicate of an IF was true, and we are at the matching ELSE.
* Just close out this package
*
* Note: ParserState->Aml is modified by the package length procedure
* TBD: [Investigate] perhaps it shouldn't, too much trouble
*/
Start = ParserState->Aml;
PackageLength = AcpiPsGetNextPackageLength (ParserState);
ParserState->Aml = Start + PackageLength;
break;
case AE_CTRL_FALSE:
/*
* Either an IF/WHILE Predicate was false or we encountered a BREAK
* opcode. In both cases, we do not execute the rest of the
* package; We simply close out the parent (finishing the walk of
* this branch of the tree) and continue execution at the parent
* level.
*/
ParserState->Aml = ParserState->Scope->ParseScope.PkgEnd;
/* In the case of a BREAK, just force a predicate (if any) to FALSE */
WalkState->ControlState->Common.Value = FALSE;
Status = AE_CTRL_END;
break;
case AE_CTRL_TRANSFER:
/*
* A method call (invocation) -- transfer control
*/
Status = AE_CTRL_TRANSFER;
WalkState->PrevOp = Op;
WalkState->MethodCallOp = Op;
WalkState->MethodCallNode = (Op->Value.Arg)->Node;
/* Will return value (if any) be used by the caller? */
WalkState->ReturnUsed = AcpiDsIsResultUsed (Op, WalkState);
break;
default:
Status = CallbackStatus;
if ((CallbackStatus & AE_CODE_MASK) == AE_CODE_CONTROL)
{
Status = AE_OK;
}
break;
}
return_ACPI_STATUS (Status);
}