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 *

 * Module Name: aslfold - Constant folding

 *

 *****************************************************************************/

 *

 * 1. Copyright Notice

 *

 * Some or all of this work - Copyright (c) 1999 - 2011, Intel Corp.

 * All rights reserved.

 *

 * 2. License

 *

 * 2.1. This is your license from Intel Corp. under its intellectual property

 * rights.  You may have additional license terms from the party that provided

 * you this software, covering your right to use that party's intellectual

 * property rights.

 *

 * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a

 * copy of the source code appearing in this file ("Covered Code") an

 * irrevocable, perpetual, worldwide license under Intel's copyrights in the

 * base code distributed originally by Intel ("Original Intel Code") to copy,

 * make derivatives, distribute, use and display any portion of the Covered

 * Code in any form, with the right to sublicense such rights; and

 *

 * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent

 * license (with the right to sublicense), under only those claims of Intel

 * patents that are infringed by the Original Intel Code, to make, use, sell,

 * offer to sell, and import the Covered Code and derivative works thereof

 * solely to the minimum extent necessary to exercise the above copyright

 * license, and in no event shall the patent license extend to any additions

 * to or modifications of the Original Intel Code.  No other license or right

 * is granted directly or by implication, estoppel or otherwise;

 *

 * The above copyright and patent license is granted only if the following

 * conditions are met:

 *

 * 3. Conditions

 *

 * 3.1. Redistribution of Source with Rights to Further Distribute Source.

 * Redistribution of source code of any substantial portion of the Covered

 * Code or modification with rights to further distribute source must include

 * the above Copyright Notice, the above License, this list of Conditions,

 * and the following Disclaimer and Export Compliance provision.  In addition,

 * Licensee must cause all Covered Code to which Licensee contributes to

 * contain a file documenting the changes Licensee made to create that Covered

 * Code and the date of any change.  Licensee must include in that file the

 * documentation of any changes made by any predecessor Licensee.  Licensee

 * must include a prominent statement that the modification is derived,

 * directly or indirectly, from Original Intel Code.

 *

 * 3.2. Redistribution of Source with no Rights to Further Distribute Source.

 * Redistribution of source code of any substantial portion of the Covered

 * Code or modification without rights to further distribute source must

 * include the following Disclaimer and Export Compliance provision in the

 * documentation and/or other materials provided with distribution.  In

 * addition, Licensee may not authorize further sublicense of source of any

 * portion of the Covered Code, and must include terms to the effect that the

 * license from Licensee to its licensee is limited to the intellectual

 * property embodied in the software Licensee provides to its licensee, and

 * not to intellectual property embodied in modifications its licensee may

 * make.

 *

 * 3.3. Redistribution of Executable. Redistribution in executable form of any

 * substantial portion of the Covered Code or modification must reproduce the

 * above Copyright Notice, and the following Disclaimer and Export Compliance

 * provision in the documentation and/or other materials provided with the

 * distribution.

 *

 * 3.4. Intel retains all right, title, and interest in and to the Original

 * Intel Code.

 *

 * 3.5. Neither the name Intel nor any other trademark owned or controlled by

 * Intel shall be used in advertising or otherwise to promote the sale, use or

 * other dealings in products derived from or relating to the Covered Code

 * without prior written authorization from Intel.

 *

 * 4. Disclaimer and Export Compliance

 *

 * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED

 * HERE.  ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE

 * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT,  ASSISTANCE,

 * INSTALLATION, TRAINING OR OTHER SERVICES.  INTEL WILL NOT PROVIDE ANY

 * UPDATES, ENHANCEMENTS OR EXTENSIONS.  INTEL SPECIFICALLY DISCLAIMS ANY

 * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A

 * PARTICULAR PURPOSE.

 *

 * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES

 * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR

 * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT,

 * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY

 * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL

 * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES.  THESE LIMITATIONS

 * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY

 * LIMITED REMEDY.

 *

 * 4.3. Licensee shall not export, either directly or indirectly, any of this

 * software or system incorporating such software without first obtaining any

 * required license or other approval from the U. S. Department of Commerce or

 * any other agency or department of the United States Government.  In the

 * event Licensee exports any such software from the United States or

 * re-exports any such software from a foreign destination, Licensee shall

 * ensure that the distribution and export/re-export of the software is in

 * compliance with all laws, regulations, orders, or other restrictions of the

 * U.S. Export Administration Regulations. Licensee agrees that neither it nor

 * any of its subsidiaries will export/re-export any technical data, process,

 * software, or service, directly or indirectly, to any country for which the

 * United States government or any agency thereof requires an export license,

 * other governmental approval, or letter of assurance, without first obtaining

 * such license, approval or letter.

 *

 *****************************************************************************/

#include "aslcompiler.y.h"

#include "amlcode.h"

#include "acparser.h"

        ACPI_MODULE_NAME    ("aslfold")

OpcAmlEvaluationWalk1 (

    ACPI_PARSE_OBJECT       *Op,

    UINT32                  Level,

    void                    *Context);

OpcAmlEvaluationWalk2 (

    ACPI_PARSE_OBJECT       *Op,

    UINT32                  Level,

    void                    *Context);

OpcAmlCheckForConstant (

    ACPI_PARSE_OBJECT       *Op,

    UINT32                  Level,

    void                    *Context);

 *

 * FUNCTION:    OpcAmlEvaluationWalk1

 *

 * PARAMETERS:  ASL_WALK_CALLBACK

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Descending callback for AML execution of constant subtrees

 *

 ******************************************************************************/

OpcAmlEvaluationWalk1 (

    ACPI_PARSE_OBJECT       *Op,

    UINT32                  Level,

    void                    *Context)

{

    ACPI_WALK_STATE         *WalkState = Context;

    ACPI_STATUS             Status;

    ACPI_PARSE_OBJECT       *OutOp;

    WalkState->Opcode = Op->Common.AmlOpcode;

    WalkState->OpInfo = AcpiPsGetOpcodeInfo (Op->Common.AmlOpcode);

    {

        Op->Common.Value.Arg = Op->Asl.Child;

    }

    if (ACPI_FAILURE (Status))

    {

        AcpiOsPrintf ("Constant interpretation failed - %s\n",

                        AcpiFormatException (Status));

    }

}

 *

 * FUNCTION:    OpcAmlEvaluationWalk2

 *

 * PARAMETERS:  ASL_WALK_CALLBACK

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Ascending callback for AML execution of constant subtrees

 *

 ******************************************************************************/

OpcAmlEvaluationWalk2 (

    ACPI_PARSE_OBJECT       *Op,

    UINT32                  Level,

    void                    *Context)

{

    ACPI_WALK_STATE         *WalkState = Context;

    ACPI_STATUS             Status;

    WalkState->Opcode = Op->Common.AmlOpcode;

    WalkState->OpInfo = AcpiPsGetOpcodeInfo (Op->Common.AmlOpcode);

    {

        Op->Common.Value.Arg = Op->Asl.Child;

    }

    if (ACPI_FAILURE (Status))

    {

        AcpiOsPrintf ("Constant interpretation failed - %s\n",

                        AcpiFormatException (Status));

    }

}

 *

 * FUNCTION:    OpcAmlCheckForConstant

 *

 * PARAMETERS:  ASL_WALK_CALLBACK

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Check one Op for a type 3/4/5 AML opcode

 *

 ******************************************************************************/

OpcAmlCheckForConstant (

    ACPI_PARSE_OBJECT       *Op,

    UINT32                  Level,

    void                    *Context)

{

    ACPI_WALK_STATE         *WalkState = Context;

    WalkState->Opcode = Op->Common.AmlOpcode;

    WalkState->OpInfo = AcpiPsGetOpcodeInfo (Op->Common.AmlOpcode);

                Op->Asl.LogicalLineNumber, Op->Asl.ParseOpName);

    {

        /* The opcode is not a Type 3/4/5 opcode */

        {

            DbgPrint (ASL_PARSE_OUTPUT,

                "**** Valid Target, cannot reduce ****\n");

        }

        else

        {

            DbgPrint (ASL_PARSE_OUTPUT,

                "**** Not a Type 3/4/5 opcode ****\n");

        }

        {

            /*

             * We are looking at at normal expression to see if it can be

             * reduced.  It can't.  No error

             */

            return (AE_TYPE);

        }

         * This is an expression that MUST reduce to a constant, and it

         * can't be reduced.  This is an error

         */

        if (Op->Asl.CompileFlags & NODE_IS_TARGET)

        {

            AslError (ASL_ERROR, ASL_MSG_INVALID_TARGET, Op,

                Op->Asl.ParseOpName);

        }

        else

        {

            AslError (ASL_ERROR, ASL_MSG_INVALID_CONSTANT_OP, Op,

                Op->Asl.ParseOpName);

        }

    }

    {

        DbgPrint (ASL_PARSE_OUTPUT, " TARGET");

    }

    if (Op->Asl.CompileFlags & NODE_IS_TERM_ARG)

    {

        DbgPrint (ASL_PARSE_OUTPUT, " TERMARG");

    }

    DbgPrint (ASL_PARSE_OUTPUT, "\n");

}

 *

 * FUNCTION:    OpcAmlConstantWalk

 *

 * PARAMETERS:  ASL_WALK_CALLBACK

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Reduce an Op and its subtree to a constant if possible

 *

 ******************************************************************************/

OpcAmlConstantWalk (

    ACPI_PARSE_OBJECT       *Op,

    UINT32                  Level,

    void                    *Context)

{

    ACPI_WALK_STATE         *WalkState;

    ACPI_STATUS             Status = AE_OK;

    ACPI_OPERAND_OBJECT     *ObjDesc;

    ACPI_PARSE_OBJECT       *RootOp;

    ACPI_PARSE_OBJECT       *OriginalParentOp;

    UINT8                   WalkType;

     * Only interested in subtrees that could possibly contain

     * expressions that can be evaluated at this time

     */

    if ((!(Op->Asl.CompileFlags & NODE_COMPILE_TIME_CONST)) ||

          (Op->Asl.CompileFlags & NODE_IS_TARGET))

    {

        return (AE_OK);

    }

    {

        /* Op is a TermArg, constant folding is merely optional */

        {

            return (AE_CTRL_DEPTH);

        }

    }

    else

    {

        /* Op is a DataObject, the expression MUST reduced to a constant */

    }

    if (!WalkState)

    {

        return AE_NO_MEMORY;

    }

    WalkState->Params               = NULL;

    WalkState->CallerReturnDesc     = &ObjDesc;

    WalkState->WalkType             = WalkType;

     * Examine the entire subtree -- all nodes must be constants

     * or type 3/4/5 opcodes

     */

    Status = TrWalkParseTree (Op, ASL_WALK_VISIT_DOWNWARD,

                OpcAmlCheckForConstant, NULL, WalkState);

     * Did we find an entire subtree that contains all constants and type 3/4/5

     * opcodes?  (Only AE_OK or AE_TYPE returned from above)

     */

    if (Status == AE_TYPE)

    {

        /* Subtree cannot be reduced to a constant */

        {

            AcpiDsDeleteWalkState (WalkState);

            return (AE_OK);

        }

    }

    else

    {

        /* Subtree can be reduced */

        if (!RootOp)

        {

            return (AE_NO_MEMORY);

        }

        Op->Common.Parent = RootOp;

                    OpcAmlEvaluationWalk1, OpcAmlEvaluationWalk2, WalkState);

        Op->Common.Parent = OriginalParentOp;

        {

            TotalFolds++;

        }

    }

    {

        /* We could not resolve the subtree for some reason */

            "Failure during constant evaluation", FALSE);

        AslError (ASL_ERROR, ASL_MSG_CONSTANT_EVALUATION, Op,

            Op->Asl.ParseOpName);

        Op->Common.Value.Integer = 0;

        OpcSetOptimalIntegerSize (Op);

    }

    else

    {

        AslError (ASL_OPTIMIZATION, ASL_MSG_CONSTANT_FOLDED, Op,

            Op->Asl.ParseOpName);

         * Because we know we executed type 3/4/5 opcodes above, we know that

         * the result must be either an Integer, String, or Buffer.

         */

        switch (ObjDesc->Common.Type)

        {

        case ACPI_TYPE_INTEGER:

            Op->Common.Value.Integer = ObjDesc->Integer.Value;

            OpcSetOptimalIntegerSize (Op);

                "Constant expression reduced to (INTEGER) %8.8X%8.8X\n",

                ACPI_FORMAT_UINT64 (ObjDesc->Integer.Value));

            break;

            Op->Common.AmlOpcode    = AML_STRING_OP;

            Op->Asl.AmlLength       = ACPI_STRLEN (ObjDesc->String.Pointer) + 1;

            Op->Common.Value.String = ObjDesc->String.Pointer;

                "Constant expression reduced to (STRING) %s\n",

                Op->Common.Value.String);

            Op->Common.AmlOpcode    = AML_BUFFER_OP;

            Op->Asl.CompileFlags    = NODE_AML_PACKAGE;

            UtSetParseOpName (Op);

            RootOp->Asl.Value.Integer = ObjDesc->Buffer.Length;

            RootOp->Asl.Parent        = Op;

            Op = RootOp;

            UtSetParseOpName (Op);

            RootOp->Asl.AmlOpcode     = AML_RAW_DATA_BUFFER;

            RootOp->Asl.AmlLength     = ObjDesc->Buffer.Length;

            RootOp->Asl.Value.String  = (char *) ObjDesc->Buffer.Pointer;

            RootOp->Asl.Parent        = Op->Asl.Parent;

            Op = RootOp;

                "Constant expression reduced to (BUFFER) length %X\n",

                ObjDesc->Buffer.Length);

            break;

            printf ("Unsupported return type: %s\n",

                        AcpiUtGetObjectTypeName (ObjDesc));

            break;

        }

    }

    Op->Asl.Child = NULL;

}