source/compiler/prexpress.c

/******************************************************************************
 *
 * Module Name: prexpress - Preprocessor #if expression support
 *
 *****************************************************************************/

/******************************************************************************
 *
 * 1. Copyright Notice
 *
 * Some or all of this work - Copyright (c) 1999 - 2017, 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.
 *
 *****************************************************************************
 *
 * Alternatively, you may choose to be licensed under the terms of the
 * following license:
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions, and the following disclaimer,
 *    without modification.
 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
 *    substantially similar to the "NO WARRANTY" disclaimer below
 *    ("Disclaimer") and any redistribution must be conditioned upon
 *    including a substantially similar Disclaimer requirement for further
 *    binary redistribution.
 * 3. Neither the names of the above-listed copyright holders nor the names
 *    of any contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * Alternatively, you may choose to be licensed under the terms of the
 * GNU General Public License ("GPL") version 2 as published by the Free
 * Software Foundation.
 *
 *****************************************************************************/

#include "aslcompiler.h"
#include "dtcompiler.h"


#define _COMPONENT          ASL_PREPROCESSOR
        ACPI_MODULE_NAME    ("prexpress")

/* Local prototypes */

static char *
PrExpandMacros (
    char                    *Line);


#ifdef _UNDER_DEVELOPMENT
/******************************************************************************
 *
 * FUNCTION:    PrUnTokenize
 *
 * PARAMETERS:  Buffer              - Token Buffer
 *              Next                - "Next" buffer from GetNextToken
 *
 * RETURN:      None
 *
 * DESCRIPTION: Un-tokenized the current token buffer. The implementation is
 *              to simply set the null inserted by GetNextToken to a blank.
 *              If Next is NULL, there were no tokens found in the Buffer,
 *              so there is nothing to do.
 *
 *****************************************************************************/

static void
PrUnTokenize (
    char                    *Buffer,
    char                    *Next)
{
    UINT32                  Length = strlen (Buffer);


    if (!Next)
    {
        return;
    }

    if (Buffer[Length] != '\n')
    {
        Buffer[strlen(Buffer)] = ' ';
    }
}
#endif


/******************************************************************************
 *
 * FUNCTION:    PrExpandMacros
 *
 * PARAMETERS:  Line                - Pointer into the current line
 *
 * RETURN:      Updated pointer into the current line
 *
 * DESCRIPTION: Expand any macros found in the current line buffer.
 *
 *****************************************************************************/

static char *
PrExpandMacros (
    char                    *Line)
{
    char                    *Token;
    char                    *ReplaceString;
    PR_DEFINE_INFO          *DefineInfo;
    ACPI_SIZE               TokenOffset;
    char                    *Next;
    int                     OffsetAdjust;


    strcpy (Gbl_ExpressionTokenBuffer, Gbl_CurrentLineBuffer);
    Token = PrGetNextToken (Gbl_ExpressionTokenBuffer, PR_EXPR_SEPARATORS, &Next);
    OffsetAdjust = 0;

    while (Token)
    {
        DefineInfo = PrMatchDefine (Token);
        if (DefineInfo)
        {
            if (DefineInfo->Body)
            {
                /* This is a macro. TBD: Is this allowed? */

                DbgPrint (ASL_DEBUG_OUTPUT, PR_PREFIX_ID
                    "Matched Macro: %s->%s\n",
                    Gbl_CurrentLineNumber, DefineInfo->Identifier,
                    DefineInfo->Replacement);

                PrDoMacroInvocation (Gbl_ExpressionTokenBuffer, Token,
                    DefineInfo, &Next);
            }
            else
            {
                ReplaceString = DefineInfo->Replacement;

                /* Replace the name in the original line buffer */

                TokenOffset = Token - Gbl_ExpressionTokenBuffer + OffsetAdjust;
                PrReplaceData (
                    &Gbl_CurrentLineBuffer[TokenOffset], strlen (Token),
                    ReplaceString, strlen (ReplaceString));

                /* Adjust for length difference between old and new name length */

                OffsetAdjust += strlen (ReplaceString) - strlen (Token);

                DbgPrint (ASL_DEBUG_OUTPUT, PR_PREFIX_ID
                    "Matched #define within expression: %s->%s\n",
                    Gbl_CurrentLineNumber, Token,
                    *ReplaceString ? ReplaceString : "(NULL STRING)");
            }
        }

        Token = PrGetNextToken (NULL, PR_EXPR_SEPARATORS, &Next);
    }

    return (Line);
}


/******************************************************************************
 *
 * FUNCTION:    PrIsDefined
 *
 * PARAMETERS:  Identifier          - Name to be resolved
 *
 * RETURN:      64-bit boolean integer value
 *
 * DESCRIPTION: Returns TRUE if the name is defined, FALSE otherwise (0).
 *
 *****************************************************************************/

UINT64
PrIsDefined (
    char                    *Identifier)
{
    UINT64                  Value;
    PR_DEFINE_INFO          *DefineInfo;


    DbgPrint (ASL_DEBUG_OUTPUT, PR_PREFIX_ID
        "**** Is defined?:  %s\n", Gbl_CurrentLineNumber, Identifier);

    Value = 0; /* Default is "Not defined" -- FALSE */

    DefineInfo = PrMatchDefine (Identifier);
    if (DefineInfo)
    {
        Value = ACPI_UINT64_MAX; /* TRUE */
    }

    DbgPrint (ASL_DEBUG_OUTPUT, PR_PREFIX_ID
        "[#if defined %s] resolved to: %8.8X%8.8X\n",
        Gbl_CurrentLineNumber, Identifier, ACPI_FORMAT_UINT64 (Value));

    return (Value);
}


/******************************************************************************
 *
 * FUNCTION:    PrResolveDefine
 *
 * PARAMETERS:  Identifier          - Name to be resolved
 *
 * RETURN:      A 64-bit boolean integer value
 *
 * DESCRIPTION: Returns TRUE if the name is defined, FALSE otherwise (0).
 *
 *****************************************************************************/

UINT64
PrResolveDefine (
    char                    *Identifier)
{
    UINT64                  Value;
    PR_DEFINE_INFO          *DefineInfo;


    DbgPrint (ASL_DEBUG_OUTPUT, PR_PREFIX_ID
        "**** Resolve #define:  %s\n", Gbl_CurrentLineNumber, Identifier);

    Value = 0; /* Default is "Not defined" -- FALSE */

    DefineInfo = PrMatchDefine (Identifier);
    if (DefineInfo)
    {
        Value = ACPI_UINT64_MAX; /* TRUE */
    }

    DbgPrint (ASL_DEBUG_OUTPUT, PR_PREFIX_ID
        "[#if defined %s] resolved to: %8.8X%8.8X\n",
        Gbl_CurrentLineNumber, Identifier, ACPI_FORMAT_UINT64 (Value));

    return (Value);
}


/******************************************************************************
 *
 * FUNCTION:    PrResolveIntegerExpression
 *
 * PARAMETERS:  Line                - Pointer to integer expression
 *              ReturnValue         - Where the resolved 64-bit integer is
 *                                    returned.
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Resolve an integer expression to a single value. Supports
 *              both integer constants and labels.
 *
 *****************************************************************************/

ACPI_STATUS
PrResolveIntegerExpression (
    char                    *Line,
    UINT64                  *ReturnValue)
{
    UINT64                  Result;
    char                    *ExpandedLine;


    DbgPrint (ASL_DEBUG_OUTPUT, PR_PREFIX_ID
        "**** Resolve #if:  %s\n", Gbl_CurrentLineNumber, Line);

    /* Expand all macros within the expression first */

    ExpandedLine = PrExpandMacros (Line);

    /* Now we can evaluate the expression */

    Result = PrEvaluateExpression (ExpandedLine);
    DbgPrint (ASL_DEBUG_OUTPUT, PR_PREFIX_ID
        "**** Expression Resolved to: %8.8X%8.8X\n",
        Gbl_CurrentLineNumber, ACPI_FORMAT_UINT64 (Result));

    *ReturnValue = Result;
    return (AE_OK);

#if 0
InvalidExpression:

    ACPI_FREE (EvalBuffer);
    PrError (ASL_ERROR, ASL_MSG_INVALID_EXPRESSION, 0);
    return (AE_ERROR);


NormalExit:

    DbgPrint (ASL_DEBUG_OUTPUT, PR_PREFIX_ID
        "**** Expression Resolved to: %8.8X%8.8X\n",
        Gbl_CurrentLineNumber, ACPI_FORMAT_UINT64 (Value1));

    *ReturnValue = Value1;
    return (AE_OK);
#endif
}