570 lines
15 KiB
C
570 lines
15 KiB
C
/******************************************************************************
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*
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* Module Name: aslanalyze.c - Support functions for parse tree walks
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*
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*****************************************************************************/
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/*
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* Copyright (C) 2000 - 2011, Intel Corp.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions, and the following disclaimer,
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* without modification.
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* 2. Redistributions in binary form must reproduce at minimum a disclaimer
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* substantially similar to the "NO WARRANTY" disclaimer below
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* ("Disclaimer") and any redistribution must be conditioned upon
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* including a substantially similar Disclaimer requirement for further
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* binary redistribution.
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* 3. Neither the names of the above-listed copyright holders nor the names
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* of any contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* Alternatively, this software may be distributed under the terms of the
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* GNU General Public License ("GPL") version 2 as published by the Free
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* Software Foundation.
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*
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* NO WARRANTY
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGES.
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*/
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#include "aslcompiler.h"
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#include "aslcompiler.y.h"
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#include <string.h>
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#define _COMPONENT ACPI_COMPILER
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ACPI_MODULE_NAME ("aslanalyze")
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/*******************************************************************************
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*
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* FUNCTION: AnIsInternalMethod
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*
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* PARAMETERS: Op - Current op
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*
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* RETURN: Boolean
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*
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* DESCRIPTION: Check for an internal control method.
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*
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******************************************************************************/
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BOOLEAN
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AnIsInternalMethod (
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ACPI_PARSE_OBJECT *Op)
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{
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if ((!ACPI_STRCMP (Op->Asl.ExternalName, "\\_OSI")) ||
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(!ACPI_STRCMP (Op->Asl.ExternalName, "_OSI")))
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{
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return (TRUE);
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}
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return (FALSE);
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}
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/*******************************************************************************
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*
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* FUNCTION: AnGetInternalMethodReturnType
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*
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* PARAMETERS: Op - Current op
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*
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* RETURN: Btype
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*
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* DESCRIPTION: Get the return type of an internal method
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*
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******************************************************************************/
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UINT32
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AnGetInternalMethodReturnType (
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ACPI_PARSE_OBJECT *Op)
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{
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if ((!ACPI_STRCMP (Op->Asl.ExternalName, "\\_OSI")) ||
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(!ACPI_STRCMP (Op->Asl.ExternalName, "_OSI")))
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{
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return (ACPI_BTYPE_STRING);
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}
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return (0);
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}
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/*******************************************************************************
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*
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* FUNCTION: AnCheckId
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*
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* PARAMETERS: Op - Current parse op
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* Type - HID or CID
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*
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* RETURN: None
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*
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* DESCRIPTION: Perform various checks on _HID and _CID strings. Only limited
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* checks can be performed on _CID strings.
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*
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******************************************************************************/
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void
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AnCheckId (
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ACPI_PARSE_OBJECT *Op,
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ACPI_NAME Type)
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{
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UINT32 i;
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ACPI_SIZE Length;
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/* Only care about string versions of _HID/_CID (integers are legal) */
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if (Op->Asl.ParseOpcode != PARSEOP_STRING_LITERAL)
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{
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return;
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}
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/* For both _HID and _CID, the string must be non-null */
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Length = strlen (Op->Asl.Value.String);
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if (!Length)
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{
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AslError (ASL_ERROR, ASL_MSG_NULL_STRING,
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Op, NULL);
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return;
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}
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/*
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* One of the things we want to catch here is the use of a leading
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* asterisk in the string -- an odd construct that certain platform
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* manufacturers are fond of. Technically, a leading asterisk is OK
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* for _CID, but a valid use of this has not been seen.
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*/
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if (*Op->Asl.Value.String == '*')
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{
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AslError (ASL_ERROR, ASL_MSG_LEADING_ASTERISK,
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Op, Op->Asl.Value.String);
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return;
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}
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/* _CID strings are bus-specific, no more checks can be performed */
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if (Type == ASL_TYPE_CID)
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{
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return;
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}
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/* For _HID, all characters must be alphanumeric */
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for (i = 0; Op->Asl.Value.String[i]; i++)
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{
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if (!isalnum ((int) Op->Asl.Value.String[i]))
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{
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AslError (ASL_ERROR, ASL_MSG_ALPHANUMERIC_STRING,
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Op, Op->Asl.Value.String);
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return;
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}
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}
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/*
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* _HID String must be one of these forms:
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*
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* "AAA####" A is an uppercase letter and # is a hex digit
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* "ACPI####" # is a hex digit
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* "NNNN####" N is an uppercase letter or decimal digit (0-9)
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* # is a hex digit (ACPI 5.0)
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*/
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if ((Length < 7) || (Length > 8))
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{
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AslError (ASL_ERROR, ASL_MSG_HID_LENGTH,
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Op, Op->Asl.Value.String);
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return;
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}
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/* _HID Length is valid (7 or 8), now check the prefix (first 3 or 4 chars) */
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if (Length == 7)
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{
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/* AAA####: Ensure the alphabetic prefix is all uppercase */
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for (i = 0; i < 3; i++)
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{
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if (!isupper ((int) Op->Asl.Value.String[i]))
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{
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AslError (ASL_ERROR, ASL_MSG_UPPER_CASE,
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Op, &Op->Asl.Value.String[i]);
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return;
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}
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}
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}
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else /* Length == 8 */
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{
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/*
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* ACPI#### or NNNN####:
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* Ensure the prefix contains only uppercase alpha or decimal digits
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*/
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for (i = 0; i < 4; i++)
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{
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if (!isupper ((int) Op->Asl.Value.String[i]) &&
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!isdigit ((int) Op->Asl.Value.String[i]))
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{
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AslError (ASL_ERROR, ASL_MSG_HID_PREFIX,
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Op, &Op->Asl.Value.String[i]);
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return;
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}
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}
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}
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/* Remaining characters (suffix) must be hex digits */
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for (; i < Length; i++)
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{
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if (!isxdigit ((int) Op->Asl.Value.String[i]))
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{
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AslError (ASL_ERROR, ASL_MSG_HID_SUFFIX,
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Op, &Op->Asl.Value.String[i]);
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break;
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}
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}
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}
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/*******************************************************************************
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*
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* FUNCTION: AnLastStatementIsReturn
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*
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* PARAMETERS: Op - A method parse node
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*
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* RETURN: TRUE if last statement is an ASL RETURN. False otherwise
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*
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* DESCRIPTION: Walk down the list of top level statements within a method
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* to find the last one. Check if that last statement is in
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* fact a RETURN statement.
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*
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******************************************************************************/
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BOOLEAN
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AnLastStatementIsReturn (
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ACPI_PARSE_OBJECT *Op)
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{
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ACPI_PARSE_OBJECT *Next;
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/* Check if last statement is a return */
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Next = ASL_GET_CHILD_NODE (Op);
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while (Next)
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{
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if ((!Next->Asl.Next) &&
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(Next->Asl.ParseOpcode == PARSEOP_RETURN))
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{
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return (TRUE);
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}
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Next = ASL_GET_PEER_NODE (Next);
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}
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return (FALSE);
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}
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/*******************************************************************************
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*
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* FUNCTION: AnCheckMethodReturnValue
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*
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* PARAMETERS: Op - Parent
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* OpInfo - Parent info
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* ArgOp - Method invocation op
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* RequiredBtypes - What caller requires
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* ThisNodeBtype - What this node returns (if anything)
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*
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* RETURN: None
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*
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* DESCRIPTION: Check a method invocation for 1) A return value and if it does
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* in fact return a value, 2) check the type of the return value.
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*
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******************************************************************************/
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void
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AnCheckMethodReturnValue (
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ACPI_PARSE_OBJECT *Op,
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const ACPI_OPCODE_INFO *OpInfo,
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ACPI_PARSE_OBJECT *ArgOp,
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UINT32 RequiredBtypes,
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UINT32 ThisNodeBtype)
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{
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ACPI_PARSE_OBJECT *OwningOp;
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ACPI_NAMESPACE_NODE *Node;
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Node = ArgOp->Asl.Node;
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/* Examine the parent op of this method */
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OwningOp = Node->Op;
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if (OwningOp->Asl.CompileFlags & NODE_METHOD_NO_RETVAL)
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{
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/* Method NEVER returns a value */
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AslError (ASL_ERROR, ASL_MSG_NO_RETVAL, Op, Op->Asl.ExternalName);
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}
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else if (OwningOp->Asl.CompileFlags & NODE_METHOD_SOME_NO_RETVAL)
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{
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/* Method SOMETIMES returns a value, SOMETIMES not */
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AslError (ASL_WARNING, ASL_MSG_SOME_NO_RETVAL, Op, Op->Asl.ExternalName);
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}
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else if (!(ThisNodeBtype & RequiredBtypes))
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{
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/* Method returns a value, but the type is wrong */
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AnFormatBtype (StringBuffer, ThisNodeBtype);
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AnFormatBtype (StringBuffer2, RequiredBtypes);
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/*
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* The case where the method does not return any value at all
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* was already handled in the namespace cross reference
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* -- Only issue an error if the method in fact returns a value,
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* but it is of the wrong type
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*/
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if (ThisNodeBtype != 0)
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{
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sprintf (MsgBuffer,
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"Method returns [%s], %s operator requires [%s]",
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StringBuffer, OpInfo->Name, StringBuffer2);
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AslError (ASL_ERROR, ASL_MSG_INVALID_TYPE, ArgOp, MsgBuffer);
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}
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}
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}
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/*******************************************************************************
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*
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* FUNCTION: AnIsResultUsed
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*
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* PARAMETERS: Op - Parent op for the operator
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*
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* RETURN: TRUE if result from this operation is actually consumed
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*
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* DESCRIPTION: Determine if the function result value from an operator is
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* used.
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*
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******************************************************************************/
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BOOLEAN
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AnIsResultUsed (
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ACPI_PARSE_OBJECT *Op)
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{
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ACPI_PARSE_OBJECT *Parent;
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switch (Op->Asl.ParseOpcode)
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{
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case PARSEOP_INCREMENT:
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case PARSEOP_DECREMENT:
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/* These are standalone operators, no return value */
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return (TRUE);
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default:
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break;
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}
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/* Examine parent to determine if the return value is used */
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Parent = Op->Asl.Parent;
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switch (Parent->Asl.ParseOpcode)
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{
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/* If/While - check if the operator is the predicate */
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case PARSEOP_IF:
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case PARSEOP_WHILE:
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/* First child is the predicate */
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if (Parent->Asl.Child == Op)
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{
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return (TRUE);
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}
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return (FALSE);
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/* Not used if one of these is the parent */
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case PARSEOP_METHOD:
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case PARSEOP_DEFINITIONBLOCK:
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case PARSEOP_ELSE:
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return (FALSE);
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default:
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/* Any other type of parent means that the result is used */
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return (TRUE);
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}
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}
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/*******************************************************************************
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*
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* FUNCTION: ApCheckForGpeNameConflict
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*
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* PARAMETERS: Op - Current parse op
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*
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* RETURN: None
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*
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* DESCRIPTION: Check for a conflict between GPE names within this scope.
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* Conflict means two GPE names with the same GPE number, but
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* different types -- such as _L1C and _E1C.
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*
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******************************************************************************/
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void
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ApCheckForGpeNameConflict (
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ACPI_PARSE_OBJECT *Op)
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{
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ACPI_PARSE_OBJECT *NextOp;
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UINT32 GpeNumber;
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char Name[ACPI_NAME_SIZE + 1];
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char Target[ACPI_NAME_SIZE];
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/* Need a null-terminated string version of NameSeg */
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ACPI_MOVE_32_TO_32 (Name, &Op->Asl.NameSeg);
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Name[ACPI_NAME_SIZE] = 0;
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/*
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* For a GPE method:
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* 1st char must be underscore
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* 2nd char must be L or E
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* 3rd/4th chars must be a hex number
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*/
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if ((Name[0] != '_') ||
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((Name[1] != 'L') && (Name[1] != 'E')))
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{
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return;
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}
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/* Verify 3rd/4th chars are a valid hex value */
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GpeNumber = ACPI_STRTOUL (&Name[2], NULL, 16);
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if (GpeNumber == ACPI_UINT32_MAX)
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{
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return;
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}
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/*
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* We are now sure we have an _Lxx or _Exx.
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* Create the target name that would cause collision (Flip E/L)
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*/
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ACPI_MOVE_32_TO_32 (Target, Name);
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/* Inject opposite letter ("L" versus "E") */
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if (Name[1] == 'L')
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{
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Target[1] = 'E';
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}
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else /* Name[1] == 'E' */
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{
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Target[1] = 'L';
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}
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/* Search all peers (objects within this scope) for target match */
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NextOp = Op->Asl.Next;
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while (NextOp)
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{
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/*
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* We mostly care about methods, but check Name() constructs also,
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* even though they will get another error for not being a method.
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* All GPE names must be defined as control methods.
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*/
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if ((NextOp->Asl.ParseOpcode == PARSEOP_METHOD) ||
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(NextOp->Asl.ParseOpcode == PARSEOP_NAME))
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{
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if (ACPI_COMPARE_NAME (Target, NextOp->Asl.NameSeg))
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{
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/* Found both _Exy and _Lxy in the same scope, error */
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AslError (ASL_ERROR, ASL_MSG_GPE_NAME_CONFLICT, NextOp,
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Name);
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return;
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}
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}
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NextOp = NextOp->Asl.Next;
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}
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/* OK, no conflict found */
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return;
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}
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/*******************************************************************************
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*
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* FUNCTION: ApCheckRegMethod
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*
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* PARAMETERS: Op - Current parse op
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*
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* RETURN: None
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*
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* DESCRIPTION: Ensure that a _REG method has a corresponding Operation
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* Region declaration within the same scope. Note: _REG is defined
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* to have two arguments and must therefore be defined as a
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* control method.
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*
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******************************************************************************/
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void
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ApCheckRegMethod (
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ACPI_PARSE_OBJECT *Op)
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{
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ACPI_PARSE_OBJECT *Next;
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ACPI_PARSE_OBJECT *Parent;
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/* We are only interested in _REG methods */
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if (!ACPI_COMPARE_NAME (METHOD_NAME__REG, &Op->Asl.NameSeg))
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{
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return;
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}
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/* Get the start of the current scope */
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Parent = Op->Asl.Parent;
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Next = Parent->Asl.Child;
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/* Search entire scope for an operation region declaration */
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while (Next)
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{
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if (Next->Asl.ParseOpcode == PARSEOP_OPERATIONREGION)
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{
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return; /* Found region, OK */
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}
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Next = Next->Asl.Next;
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}
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/* No region found, issue warning */
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AslError (ASL_WARNING, ASL_MSG_NO_REGION, Op, NULL);
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}
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