dswexec.c

acpi tools for linux include acpiexec and acpixtract

 * FUNCTION:    AcpiDsExecEndOp
 *
 * PARAMETERS:  WalkState       - Current state of the parse tree walk
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Ascending callback used during the execution of control
 *              methods.  The only thing we really need to do here is to
 *              notice the beginning of IF, ELSE, and WHILE blocks.
 *
 ****************************************************************************/

ACPI_STATUS
AcpiDsExecEndOp (
    ACPI_WALK_STATE         *WalkState)
{
    ACPI_PARSE_OBJECT       *Op;
    ACPI_STATUS             Status = AE_OK;
    UINT32                  OpType;
    UINT32                  OpClass;
    ACPI_PARSE_OBJECT       *NextOp;
    ACPI_PARSE_OBJECT       *FirstArg;


    ACPI_FUNCTION_TRACE_PTR (DsExecEndOp, WalkState);


    Op      = WalkState->Op;
    OpType  = WalkState->OpInfo->Type;
    OpClass = WalkState->OpInfo->Class;

    if (OpClass == AML_CLASS_UNKNOWN)
    {
        ACPI_ERROR ((AE_INFO, "Unknown opcode %X", Op->Common.AmlOpcode));
        return_ACPI_STATUS (AE_NOT_IMPLEMENTED);
    }

    FirstArg = Op->Common.Value.Arg;

    /* Init the walk state */

    WalkState->NumOperands = 0;
    WalkState->OperandIndex = 0;
    WalkState->ReturnDesc = NULL;
    WalkState->ResultObj = NULL;

    /* Call debugger for single step support (DEBUG build only) */

    ACPI_DEBUGGER_EXEC (Status = AcpiDbSingleStep (WalkState, Op, OpClass));
    ACPI_DEBUGGER_EXEC (if (ACPI_FAILURE (Status)) {return_ACPI_STATUS (Status);});

    /* Decode the Opcode Class */

    switch (OpClass)
    {
    case AML_CLASS_ARGUMENT:    /* Constants, literals, etc. */

        if (WalkState->Opcode == AML_INT_NAMEPATH_OP)
        {
            Status = AcpiDsEvaluateNamePath (WalkState);
            if (ACPI_FAILURE (Status))
            {
                goto Cleanup;
            }
        }
        break;


    case AML_CLASS_EXECUTE:     /* Most operators with arguments */

        /* Build resolved operand stack */

        Status = AcpiDsCreateOperands (WalkState, FirstArg);
        if (ACPI_FAILURE (Status))
        {
            goto Cleanup;
        }

        /*
         * All opcodes require operand resolution, with the only exceptions
         * being the ObjectType and SizeOf operators.
         */
        if (!(WalkState->OpInfo->Flags & AML_NO_OPERAND_RESOLVE))
        {
            /* Resolve all operands */

            Status = AcpiExResolveOperands (WalkState->Opcode,
                        &(WalkState->Operands [WalkState->NumOperands -1]),
                        WalkState);
            if (ACPI_SUCCESS (Status))
            {
                ACPI_DUMP_OPERANDS (ACPI_WALK_OPERANDS, ACPI_IMODE_EXECUTE,
                    AcpiPsGetOpcodeName (WalkState->Opcode),
                    WalkState->NumOperands, "after ExResolveOperands");
            }
        }

        if (ACPI_SUCCESS (Status))
        {
            /*
             * Dispatch the request to the appropriate interpreter handler
             * routine.  There is one routine per opcode "type" based upon the
             * number of opcode arguments and return type.
             */
            Status = AcpiGbl_OpTypeDispatch[OpType] (WalkState);
        }
        else
        {
            /*
             * Treat constructs of the form "Store(LocalX,LocalX)" as noops when the
             * Local is uninitialized.
             */
            if  ((Status == AE_AML_UNINITIALIZED_LOCAL) &&
                (WalkState->Opcode == AML_STORE_OP) &&
                (WalkState->Operands[0]->Common.Type == ACPI_TYPE_LOCAL_REFERENCE) &&
                (WalkState->Operands[1]->Common.Type == ACPI_TYPE_LOCAL_REFERENCE) &&
                (WalkState->Operands[0]->Reference.Opcode ==
                 WalkState->Operands[1]->Reference.Opcode) &&
                (WalkState->Operands[0]->Reference.Offset ==
                 WalkState->Operands[1]->Reference.Offset))
            {
                Status = AE_OK;
            }
            else
            {
                ACPI_EXCEPTION ((AE_INFO, Status,
                    "While resolving operands for [%s]",
                    AcpiPsGetOpcodeName (WalkState->Opcode)));
            }
        }

        /* Always delete the argument objects and clear the operand stack */

        AcpiDsClearOperands (WalkState);

        /*
         * If a result object was returned from above, push it on the
         * current result stack
         */
        if (ACPI_SUCCESS (Status) &&
            WalkState->ResultObj)
        {
            Status = AcpiDsResultPush (WalkState->ResultObj, WalkState);
        }
        break;


    default:

        switch (OpType)
        {
        case AML_TYPE_CONTROL:    /* Type 1 opcode, IF/ELSE/WHILE/NOOP */

            /* 1 Operand, 0 ExternalResult, 0 InternalResult */

            Status = AcpiDsExecEndControlOp (WalkState, Op);

            break;


        case AML_TYPE_METHOD_CALL:

            /*
             * If the method is referenced from within a package
             * declaration, it is not a invocation of the method, just
             * a reference to it.
             */
            if ((Op->Asl.Parent) &&
               ((Op->Asl.Parent->Asl.AmlOpcode == AML_PACKAGE_OP) ||
                (Op->Asl.Parent->Asl.AmlOpcode == AML_VAR_PACKAGE_OP)))
            {
                ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
                    "Method Reference in a Package, Op=%p\n", Op));

                Op->Common.Node = (ACPI_NAMESPACE_NODE *) Op->Asl.Value.Arg->Asl.Node;
                AcpiUtAddReference (Op->Asl.Value.Arg->Asl.Node->Object);
                return_ACPI_STATUS (AE_OK);
            }

            ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH, "Method invocation, Op=%p\n", Op));

            /*
             * (AML_METHODCALL) Op->Asl.Value.Arg->Asl.Node contains
             * the method Node pointer
             */
            /* NextOp points to the op that holds the method name */

            NextOp = FirstArg;

            /* NextOp points to first argument op */

            NextOp = NextOp->Common.Next;

            /*
             * Get the method's arguments and put them on the operand stack
             */
            Status = AcpiDsCreateOperands (WalkState, NextOp);
            if (ACPI_FAILURE (Status))
            {
                break;
            }

            /*
             * Since the operands will be passed to another control method,
             * we must resolve all local references here (Local variables,
             * arguments to *this* method, etc.)
             */
            Status = AcpiDsResolveOperands (WalkState);
            if (ACPI_FAILURE (Status))
            {
                /* On error, clear all resolved operands */

                AcpiDsClearOperands (WalkState);
                break;
            }

            /*
             * Tell the walk loop to preempt this running method and
             * execute the new method
             */
            Status = AE_CTRL_TRANSFER;

            /*
             * Return now; we don't want to disturb anything,
             * especially the operand count!
             */
            return_ACPI_STATUS (Status);


        case AML_TYPE_CREATE_FIELD:

            ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
                "Executing CreateField Buffer/Index Op=%p\n", Op));

            Status = AcpiDsLoad2EndOp (WalkState);
            if (ACPI_FAILURE (Status))
            {
                break;
            }

            Status = AcpiDsEvalBufferFieldOperands (WalkState, Op);
            break;


        case AML_TYPE_CREATE_OBJECT:

            ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
                "Executing CreateObject (Buffer/Package) Op=%p\n", Op));

            switch (Op->Common.Parent->Common.AmlOpcode)
            {
            case AML_NAME_OP:

                /*
                 * Put the Node on the object stack (Contains the ACPI Name
                 * of this object)
                 */
                WalkState->Operands[0] = (void *) Op->Common.Parent->Common.Node;
                WalkState->NumOperands = 1;

                Status = AcpiDsCreateNode (WalkState,
                            Op->Common.Parent->Common.Node,
                            Op->Common.Parent);
                if (ACPI_FAILURE (Status))
                {
                    break;
                }

                /* Fall through */
                /*lint -fallthrough */

            case AML_INT_EVAL_SUBTREE_OP:

                Status = AcpiDsEvalDataObjectOperands (WalkState, Op,
                            AcpiNsGetAttachedObject (Op->Common.Parent->Common.Node));
                break;

            default:

                Status = AcpiDsEvalDataObjectOperands (WalkState, Op, NULL);
                break;
            }

            /*
             * If a result object was returned from above, push it on the
             * current result stack
             */
            if (WalkState->ResultObj)
            {
                Status = AcpiDsResultPush (WalkState->ResultObj, WalkState);
            }
            break;


        case AML_TYPE_NAMED_FIELD:
        case AML_TYPE_NAMED_COMPLEX:
        case AML_TYPE_NAMED_SIMPLE:
        case AML_TYPE_NAMED_NO_OBJ:

            Status = AcpiDsLoad2EndOp (WalkState);
            if (ACPI_FAILURE (Status))
            {
                break;
            }

            if (Op->Common.AmlOpcode == AML_REGION_OP)
            {
                ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
                    "Executing OpRegion Address/Length Op=%p\n", Op));

                Status = AcpiDsEvalRegionOperands (WalkState, Op);
                if (ACPI_FAILURE (Status))
                {
                    break;
                }
            }
            else if (Op->Common.AmlOpcode == AML_DATA_REGION_OP)
            {
                ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
                    "Executing DataTableRegion Strings Op=%p\n", Op));

                Status = AcpiDsEvalTableRegionOperands (WalkState, Op);
                if (ACPI_FAILURE (Status))
                {
                    break;
                }
            }
            else if (Op->Common.AmlOpcode == AML_BANK_FIELD_OP)
            {
                ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
                    "Executing BankField Op=%p\n", Op));

                Status = AcpiDsEvalBankFieldOperands (WalkState, Op);
                if (ACPI_FAILURE (Status))
                {
                    break;
                }
            }
            break;


        case AML_TYPE_UNDEFINED:

            ACPI_ERROR ((AE_INFO,
                "Undefined opcode type Op=%p", Op));
            return_ACPI_STATUS (AE_NOT_IMPLEMENTED);


        case AML_TYPE_BOGUS:

            ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
                "Internal opcode=%X type Op=%p\n",
                WalkState->Opcode, Op));
            break;


        default:

            ACPI_ERROR ((AE_INFO,
                "Unimplemented opcode, class=%X type=%X Opcode=%X Op=%p",
                OpClass, OpType, Op->Common.AmlOpcode, Op));

            Status = AE_NOT_IMPLEMENTED;
            break;
        }
    }

    /*
     * ACPI 2.0 support for 64-bit integers: Truncate numeric
     * result value if we are executing from a 32-bit ACPI table
     */
    AcpiExTruncateFor32bitTable (WalkState->ResultObj);

    /*
     * Check if we just completed the evaluation of a
     * conditional predicate
     */
    if ((ACPI_SUCCESS (Status)) &&
        (WalkState->ControlState) &&
        (WalkState->ControlState->Common.State ==
            ACPI_CONTROL_PREDICATE_EXECUTING) &&
        (WalkState->ControlState->Control.PredicateOp == Op))
    {
        Status = AcpiDsGetPredicateValue (WalkState, WalkState->ResultObj);
        WalkState->ResultObj = NULL;
    }


Cleanup:

    if (WalkState->ResultObj)
    {
        /* Break to debugger to display result */

        ACPI_DEBUGGER_EXEC (AcpiDbDisplayResultObject (WalkState->ResultObj,
                                WalkState));

        /*
         * Delete the result op if and only if:
         * Parent will not use the result -- such as any
         * non-nested type2 op in a method (parent will be method)
         */
        AcpiDsDeleteResultIfNotUsed (Op, WalkState->ResultObj, WalkState);
    }

#ifdef _UNDER_DEVELOPMENT

    if (WalkState->ParserState.Aml == WalkState->ParserState.AmlEnd)
    {
        AcpiDbMethodEnd (WalkState);
    }
#endif

    /* Invoke exception handler on error */

    if (ACPI_FAILURE (Status))
    {
        Status = AcpiDsMethodError (Status, WalkState);
    }

    /* Always clear the object stack */

    WalkState->NumOperands = 0;
    return_ACPI_STATUS (Status);
}