psloop.c

acpi tools for linux include acpiexec and acpixtract

                    return_ACPI_STATUS (Status2);
                }
            }

            AcpiPsPopScope (&(WalkState->ParserState), Op,
                &WalkState->ArgTypes, &WalkState->ArgCount);

        } while (*Op);


#if 0
        /*
         * TBD: Cleanup parse ops on error
         */
        if (*Op == NULL)
        {
            AcpiPsPopScope (ParserState, Op,
                &WalkState->ArgTypes, &WalkState->ArgCount);
        }
#endif
        WalkState->PrevOp = NULL;
        WalkState->PrevArgTypes = WalkState->ArgTypes;
        return_ACPI_STATUS (Status);
    }

    /* This scope complete? */

    if (AcpiPsHasCompletedScope (&(WalkState->ParserState)))
    {
        AcpiPsPopScope (&(WalkState->ParserState), Op,
            &WalkState->ArgTypes, &WalkState->ArgCount);
        ACPI_DEBUG_PRINT ((ACPI_DB_PARSE, "Popped scope, Op=%p\n", *Op));
    }
    else
    {
        *Op = NULL;
    }

    return_ACPI_STATUS (AE_OK);
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiPsCompleteFinalOp
 *
 * PARAMETERS:  WalkState           - Current state
 *              Op                  - Current Op
 *              Status              - Current parse status before complete last
 *                                    Op
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Complete last Op.
 *
 ******************************************************************************/

static ACPI_STATUS
AcpiPsCompleteFinalOp (
    ACPI_WALK_STATE         *WalkState,
    ACPI_PARSE_OBJECT       *Op,
    ACPI_STATUS             Status)
{
    ACPI_STATUS             Status2;


    ACPI_FUNCTION_TRACE_PTR (PsCompleteFinalOp, WalkState);


    /*
     * Complete the last Op (if not completed), and clear the scope stack.
     * It is easily possible to end an AML "package" with an unbounded number
     * of open scopes (such as when several ASL blocks are closed with
     * sequential closing braces). We want to terminate each one cleanly.
     */
    ACPI_DEBUG_PRINT ((ACPI_DB_PARSE, "AML package complete at Op %p\n", Op));
    do
    {
        if (Op)
        {
            if (WalkState->AscendingCallback != NULL)
            {
                WalkState->Op = Op;
                WalkState->OpInfo = AcpiPsGetOpcodeInfo (Op->Common.AmlOpcode);
                WalkState->Opcode = Op->Common.AmlOpcode;

                Status = WalkState->AscendingCallback (WalkState);
                Status = AcpiPsNextParseState (WalkState, Op, Status);
                if (Status == AE_CTRL_PENDING)
                {
                    Status = AcpiPsCompleteOp (WalkState, &Op, AE_OK);
                    if (ACPI_FAILURE (Status))
                    {
                        return_ACPI_STATUS (Status);
                    }
                }

                if (Status == AE_CTRL_TERMINATE)
                {
                    Status = AE_OK;

                    /* Clean up */
                    do
                    {
                        if (Op)
                        {
                            Status2 = AcpiPsCompleteThisOp (WalkState, Op);
                            if (ACPI_FAILURE (Status2))
                            {
                                return_ACPI_STATUS (Status2);
                            }
                        }

                        AcpiPsPopScope (&(WalkState->ParserState), &Op,
                            &WalkState->ArgTypes, &WalkState->ArgCount);

                    } while (Op);

                    return_ACPI_STATUS (Status);
                }

                else if (ACPI_FAILURE (Status))
                {
                    /* First error is most important */

                    (void) AcpiPsCompleteThisOp (WalkState, Op);
                    return_ACPI_STATUS (Status);
                }
            }

            Status2 = AcpiPsCompleteThisOp (WalkState, Op);
            if (ACPI_FAILURE (Status2))
            {
                return_ACPI_STATUS (Status2);
            }
        }

        AcpiPsPopScope (&(WalkState->ParserState), &Op, &WalkState->ArgTypes,
            &WalkState->ArgCount);

    } while (Op);

    return_ACPI_STATUS (Status);
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiPsParseLoop
 *
 * PARAMETERS:  WalkState           - Current state
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Parse AML (pointed to by the current parser state) and return
 *              a tree of ops.
 *
 ******************************************************************************/

ACPI_STATUS
AcpiPsParseLoop (
    ACPI_WALK_STATE         *WalkState)
{
    ACPI_STATUS             Status = AE_OK;
    ACPI_PARSE_OBJECT       *Op = NULL;     /* current op */
    ACPI_PARSE_STATE        *ParserState;
    UINT8                   *AmlOpStart = NULL;


    ACPI_FUNCTION_TRACE_PTR (PsParseLoop, WalkState);


    if (WalkState->DescendingCallback == NULL)
    {
        return_ACPI_STATUS (AE_BAD_PARAMETER);
    }

    ParserState = &WalkState->ParserState;
    WalkState->ArgTypes = 0;

#if (!defined (ACPI_NO_METHOD_EXECUTION) && !defined (ACPI_CONSTANT_EVAL_ONLY))

    if (WalkState->WalkType & ACPI_WALK_METHOD_RESTART)
    {
        /* We are restarting a preempted control method */

        if (AcpiPsHasCompletedScope (ParserState))
        {
            /*
             * We must check if a predicate to an IF or WHILE statement
             * was just completed
             */
            if ((ParserState->Scope->ParseScope.Op) &&
               ((ParserState->Scope->ParseScope.Op->Common.AmlOpcode == AML_IF_OP) ||
                (ParserState->Scope->ParseScope.Op->Common.AmlOpcode == AML_WHILE_OP)) &&
                (WalkState->ControlState) &&
                (WalkState->ControlState->Common.State ==
                    ACPI_CONTROL_PREDICATE_EXECUTING))
            {
                /*
                 * A predicate was just completed, get the value of the
                 * predicate and branch based on that value
                 */
                WalkState->Op = NULL;
                Status = AcpiDsGetPredicateValue (WalkState, ACPI_TO_POINTER (TRUE));
                if (ACPI_FAILURE (Status) &&
                    ((Status & AE_CODE_MASK) != AE_CODE_CONTROL))
                {
                    if (Status == AE_AML_NO_RETURN_VALUE)
                    {
                        ACPI_EXCEPTION ((AE_INFO, Status,
                            "Invoked method did not return a value"));

                    }

                    ACPI_EXCEPTION ((AE_INFO, Status, "GetPredicate Failed"));
                    return_ACPI_STATUS (Status);
                }

                Status = AcpiPsNextParseState (WalkState, Op, Status);
            }

            AcpiPsPopScope (ParserState, &Op,
                &WalkState->ArgTypes, &WalkState->ArgCount);
            ACPI_DEBUG_PRINT ((ACPI_DB_PARSE, "Popped scope, Op=%p\n", Op));
        }
        else if (WalkState->PrevOp)
        {
            /* We were in the middle of an op */

            Op = WalkState->PrevOp;
            WalkState->ArgTypes = WalkState->PrevArgTypes;
        }
    }
#endif

    /* Iterative parsing loop, while there is more AML to process: */

    while ((ParserState->Aml < ParserState->AmlEnd) || (Op))
    {
        AmlOpStart = ParserState->Aml;
        if (!Op)
        {
            Status = AcpiPsCreateOp (WalkState, AmlOpStart, &Op);
            if (ACPI_FAILURE (Status))
            {
                if (Status == AE_CTRL_PARSE_CONTINUE)
                {
                    continue;
                }

                if (Status == AE_CTRL_PARSE_PENDING)
                {
                    Status = AE_OK;
                }

                Status = AcpiPsCompleteOp (WalkState, &Op, Status);
                if (ACPI_FAILURE (Status))
                {
                    return_ACPI_STATUS (Status);
                }

                continue;
            }

            Op->Common.AmlOffset = WalkState->AmlOffset;

            if (WalkState->OpInfo)
            {
                ACPI_DEBUG_PRINT ((ACPI_DB_PARSE,
                    "Opcode %4.4X [%s] Op %p Aml %p AmlOffset %5.5X\n",
                     (UINT32) Op->Common.AmlOpcode, WalkState->OpInfo->Name,
                     Op, ParserState->Aml, Op->Common.AmlOffset));
            }
        }


        /*
         * Start ArgCount at zero because we don't know if there are
         * any args yet
         */
        WalkState->ArgCount  = 0;

        /* Are there any arguments that must be processed? */

        if (WalkState->ArgTypes)
        {
            /* Get arguments */

            Status = AcpiPsGetArguments (WalkState, AmlOpStart, Op);
            if (ACPI_FAILURE (Status))
            {
                Status = AcpiPsCompleteOp (WalkState, &Op, Status);
                if (ACPI_FAILURE (Status))
                {
                    return_ACPI_STATUS (Status);
                }

                continue;
            }
        }

        /* Check for arguments that need to be processed */

        if (WalkState->ArgCount)
        {
            /*
             * There are arguments (complex ones), push Op and
             * prepare for argument
             */
            Status = AcpiPsPushScope (ParserState, Op,
                        WalkState->ArgTypes, WalkState->ArgCount);
            if (ACPI_FAILURE (Status))
            {
                Status = AcpiPsCompleteOp (WalkState, &Op, Status);
                if (ACPI_FAILURE (Status))
                {
                    return_ACPI_STATUS (Status);
                }

                continue;
            }

            Op = NULL;
            continue;
        }

        /*
         * All arguments have been processed -- Op is complete,
         * prepare for next
         */
        WalkState->OpInfo = AcpiPsGetOpcodeInfo (Op->Common.AmlOpcode);
        if (WalkState->OpInfo->Flags & AML_NAMED)
        {
            if (AcpiGbl_Depth)
            {
                AcpiGbl_Depth--;
            }

            if (Op->Common.AmlOpcode == AML_REGION_OP ||
                Op->Common.AmlOpcode == AML_DATA_REGION_OP)
            {
                /*
                 * Skip parsing of control method or opregion body,
                 * because we don't have enough info in the first pass
                 * to parse them correctly.
                 *
                 * Completed parsing an OpRegion declaration, we now
                 * know the length.
                 */
                Op->Named.Length = (UINT32) (ParserState->Aml - Op->Named.Data);
            }
        }

        if (WalkState->OpInfo->Flags & AML_CREATE)
        {
            /*
             * Backup to beginning of CreateXXXfield declaration (1 for
             * Opcode)
             *
             * BodyLength is unknown until we parse the body
             */
            Op->Named.Length = (UINT32) (ParserState->Aml - Op->Named.Data);
        }

        if (Op->Common.AmlOpcode == AML_BANK_FIELD_OP)
        {
            /*
             * Backup to beginning of BankField declaration
             *
             * BodyLength is unknown until we parse the body
             */
            Op->Named.Length = (UINT32) (ParserState->Aml - Op->Named.Data);
        }

        /* This op complete, notify the dispatcher */

        if (WalkState->AscendingCallback != NULL)
        {
            WalkState->Op = Op;
            WalkState->Opcode = Op->Common.AmlOpcode;

            Status = WalkState->AscendingCallback (WalkState);
            Status = AcpiPsNextParseState (WalkState, Op, Status);
            if (Status == AE_CTRL_PENDING)
            {
                Status = AE_OK;
            }
        }

        Status = AcpiPsCompleteOp (WalkState, &Op, Status);
        if (ACPI_FAILURE (Status))
        {
            return_ACPI_STATUS (Status);
        }

    } /* while ParserState->Aml */

    Status = AcpiPsCompleteFinalOp (WalkState, Op, Status);
    return_ACPI_STATUS (Status);
}