asltransform.c

acpi tools for linux include acpiexec and acpixtract

/******************************************************************************
 *
 * Module Name: asltransform - Parse tree transforms
 *              $Revision: 1.43 $
 *
 *****************************************************************************/

/******************************************************************************
 *
 * 1. Copyright Notice
 *
 * Some or all of this work - Copyright (c) 1999 - 2008, 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.h"
#include "aslcompiler.y.h"

#define _COMPONENT          ACPI_COMPILER
        ACPI_MODULE_NAME    ("asltransform")

/* Local prototypes */

static void
TrTransformSubtree (
    ACPI_PARSE_OBJECT       *Op);

static char *
TrAmlGetNextTempName (
    ACPI_PARSE_OBJECT       *Op,
    UINT8                   *TempCount);

static void
TrAmlInitLineNumbers (
    ACPI_PARSE_OBJECT       *Op,
    ACPI_PARSE_OBJECT       *Neighbor);

static void
TrAmlInitNode (
    ACPI_PARSE_OBJECT       *Op,
    UINT16                  ParseOpcode);

static void
TrAmlSetSubtreeParent (
    ACPI_PARSE_OBJECT       *Op,
    ACPI_PARSE_OBJECT       *Parent);

static void
TrAmlInsertPeer (
    ACPI_PARSE_OBJECT       *Op,
    ACPI_PARSE_OBJECT       *NewPeer);

static void
TrDoDefinitionBlock (
    ACPI_PARSE_OBJECT       *Op);

static void
TrDoSwitch (
    ACPI_PARSE_OBJECT       *StartNode);


/*******************************************************************************
 *
 * FUNCTION:    TrAmlGetNextTempName
 *
 * PARAMETERS:  Op              - Current parse op
 *              TempCount       - Current temporary counter. Was originally
 *                                per-module; Currently per method, could be
 *                                expanded to per-scope.
 *
 * RETURN:      A pointer to name (allocated here).
 *
 * DESCRIPTION: Generate an ACPI name of the form _T_x.  These names are
 *              reserved for use by the ASL compiler. (_T_0 through _T_Z)
 *
 ******************************************************************************/

static char *
TrAmlGetNextTempName (
    ACPI_PARSE_OBJECT       *Op,
    UINT8                   *TempCount)
{
    char                    *TempName;


    if (*TempCount >= (10+26))  /* 0-35 valid: 0-9 and A-Z for TempName[3] */
    {
        /* Too many temps */

        AslError (ASL_ERROR, ASL_MSG_TOO_MANY_TEMPS, Op, NULL);
        return (NULL);
    }

    TempName = UtLocalCalloc (5);

    if (*TempCount < 10)    /* 0-9 */
    {
        TempName[3] = (char) (*TempCount + '0');
    }
    else                    /* 10-35: A-Z */
    {
        TempName[3] = (char) (*TempCount + ('A' - 10));
    }
    (*TempCount)++;

    /* First three characters are always "_T_" */

    TempName[0] = '_';
    TempName[1] = 'T';
    TempName[2] = '_';

    return (TempName);
}


/*******************************************************************************
 *
 * FUNCTION:    TrAmlInitLineNumbers
 *
 * PARAMETERS:  Op              - Op to be initialized
 *              Neighbor        - Op used for initialization values
 *
 * RETURN:      None
 *
 * DESCRIPTION: Initialized the various line numbers for a parse node.
 *
 ******************************************************************************/

static void
TrAmlInitLineNumbers (
    ACPI_PARSE_OBJECT       *Op,
    ACPI_PARSE_OBJECT       *Neighbor)
{

    Op->Asl.EndLine           = Neighbor->Asl.EndLine;
    Op->Asl.EndLogicalLine    = Neighbor->Asl.EndLogicalLine;
    Op->Asl.LineNumber        = Neighbor->Asl.LineNumber;
    Op->Asl.LogicalByteOffset = Neighbor->Asl.LogicalByteOffset;
    Op->Asl.LogicalLineNumber = Neighbor->Asl.LogicalLineNumber;
}


/*******************************************************************************
 *
 * FUNCTION:    TrAmlInitNode
 *
 * PARAMETERS:  Op              - Op to be initialized
 *              ParseOpcode     - Opcode for this node
 *
 * RETURN:      None
 *
 * DESCRIPTION: Initialize a node with the parse opcode and opcode name.
 *
 ******************************************************************************/

static void
TrAmlInitNode (
    ACPI_PARSE_OBJECT       *Op,
    UINT16                  ParseOpcode)
{

    Op->Asl.ParseOpcode = ParseOpcode;
    UtSetParseOpName (Op);
}


/*******************************************************************************
 *
 * FUNCTION:    TrAmlSetSubtreeParent
 *
 * PARAMETERS:  Op              - First node in a list of peer nodes
 *              Parent          - Parent of the subtree
 *
 * RETURN:      None
 *
 * DESCRIPTION: Set the parent for all peer nodes in a subtree
 *
 ******************************************************************************/

static void
TrAmlSetSubtreeParent (
    ACPI_PARSE_OBJECT       *Op,
    ACPI_PARSE_OBJECT       *Parent)
{
    ACPI_PARSE_OBJECT       *Next;


    Next = Op;
    while (Next)
    {
        Next->Asl.Parent = Parent;
        Next             = Next->Asl.Next;
    }
}


/*******************************************************************************
 *
 * FUNCTION:    TrAmlInsertPeer
 *
 * PARAMETERS:  Op              - First node in a list of peer nodes
 *              NewPeer         - Peer node to insert
 *
 * RETURN:      None
 *
 * DESCRIPTION: Insert a new peer node into a list of peers.
 *
 ******************************************************************************/

static void
TrAmlInsertPeer (
    ACPI_PARSE_OBJECT       *Op,
    ACPI_PARSE_OBJECT       *NewPeer)
{

    NewPeer->Asl.Next = Op->Asl.Next;
    Op->Asl.Next      = NewPeer;
}


/*******************************************************************************
 *
 * FUNCTION:    TrAmlTransformWalk
 *
 * PARAMETERS:  ASL_WALK_CALLBACK
 *
 * RETURN:      None
 *
 * DESCRIPTION: Parse tree walk to generate both the AML opcodes and the AML
 *              operands.
 *
 ******************************************************************************/

ACPI_STATUS
TrAmlTransformWalk (
    ACPI_PARSE_OBJECT       *Op,
    UINT32                  Level,
    void                    *Context)
{

    TrTransformSubtree (Op);
    return (AE_OK);
}


/*******************************************************************************
 *
 * FUNCTION:    TrTransformSubtree
 *
 * PARAMETERS:  Op        - The parent parse node
 *
 * RETURN:      None
 *
 * DESCRIPTION: Prepare nodes to be output as AML data and operands.  The more
 *              complex AML opcodes require processing of the child nodes
 *              (arguments/operands).
 *
 ******************************************************************************/

static void
TrTransformSubtree (
    ACPI_PARSE_OBJECT           *Op)
{

    if (Op->Asl.AmlOpcode == AML_RAW_DATA_BYTE)
    {
        return;
    }

    switch (Op->Asl.ParseOpcode)
    {
    case PARSEOP_DEFINITIONBLOCK:
        TrDoDefinitionBlock (Op);
        break;

    case PARSEOP_SWITCH:
        TrDoSwitch (Op);
        break;

    case PARSEOP_METHOD:

        /*
         * TBD: Zero the tempname (_T_x) count. Probably shouldn't be a global,
         * however
         */
        Gbl_TempCount = 0;
        break;

    default:
        /* Nothing to do here for other opcodes */
        break;
    }
}


/*******************************************************************************
 *
 * FUNCTION:    TrDoDefinitionBlock
 *
 * PARAMETERS:  Op        - Parse node
 *