727 lines
22 KiB
C
727 lines
22 KiB
C
/******************************************************************************
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*
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* Module Name: aslmethod.c - Control method analysis walk
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*
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*****************************************************************************/
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/*
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* Copyright (C) 2000 - 2015, 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 "acparser.h"
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#include "amlcode.h"
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#define _COMPONENT ACPI_COMPILER
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ACPI_MODULE_NAME ("aslmethod")
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/* Local prototypes */
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void
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MtCheckNamedObjectInMethod (
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ACPI_PARSE_OBJECT *Op,
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ASL_METHOD_INFO *MethodInfo);
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/*******************************************************************************
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*
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* FUNCTION: MtMethodAnalysisWalkBegin
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*
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* PARAMETERS: ASL_WALK_CALLBACK
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*
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* RETURN: Status
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*
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* DESCRIPTION: Descending callback for the analysis walk. Check methods for:
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* 1) Initialized local variables
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* 2) Valid arguments
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* 3) Return types
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*
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******************************************************************************/
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ACPI_STATUS
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MtMethodAnalysisWalkBegin (
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ACPI_PARSE_OBJECT *Op,
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UINT32 Level,
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void *Context)
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{
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ASL_ANALYSIS_WALK_INFO *WalkInfo = (ASL_ANALYSIS_WALK_INFO *) Context;
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ASL_METHOD_INFO *MethodInfo = WalkInfo->MethodStack;
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ACPI_PARSE_OBJECT *Next;
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UINT32 RegisterNumber;
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UINT32 i;
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char LocalName[] = "Local0";
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char ArgName[] = "Arg0";
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ACPI_PARSE_OBJECT *ArgNode;
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ACPI_PARSE_OBJECT *NextType;
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ACPI_PARSE_OBJECT *NextParamType;
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UINT8 ActualArgs = 0;
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switch (Op->Asl.ParseOpcode)
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{
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case PARSEOP_METHOD:
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TotalMethods++;
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/* Create and init method info */
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MethodInfo = UtLocalCalloc (sizeof (ASL_METHOD_INFO));
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MethodInfo->Next = WalkInfo->MethodStack;
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MethodInfo->Op = Op;
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WalkInfo->MethodStack = MethodInfo;
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/*
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* Special handling for _PSx methods. Dependency rules (same scope):
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*
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* 1) _PS0 - One of these must exist: _PS1, _PS2, _PS3
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* 2) _PS1/_PS2/_PS3: A _PS0 must exist
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*/
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if (ACPI_COMPARE_NAME (METHOD_NAME__PS0, Op->Asl.NameSeg))
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{
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/* For _PS0, one of _PS1/_PS2/_PS3 must exist */
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if ((!ApFindNameInScope (METHOD_NAME__PS1, Op)) &&
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(!ApFindNameInScope (METHOD_NAME__PS2, Op)) &&
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(!ApFindNameInScope (METHOD_NAME__PS3, Op)))
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{
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AslError (ASL_WARNING, ASL_MSG_MISSING_DEPENDENCY, Op,
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"_PS0 requires one of _PS1/_PS2/_PS3 in same scope");
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}
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}
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else if (
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ACPI_COMPARE_NAME (METHOD_NAME__PS1, Op->Asl.NameSeg) ||
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ACPI_COMPARE_NAME (METHOD_NAME__PS2, Op->Asl.NameSeg) ||
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ACPI_COMPARE_NAME (METHOD_NAME__PS3, Op->Asl.NameSeg))
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{
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/* For _PS1/_PS2/_PS3, a _PS0 must exist */
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if (!ApFindNameInScope (METHOD_NAME__PS0, Op))
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{
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sprintf (MsgBuffer,
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"%4.4s requires _PS0 in same scope", Op->Asl.NameSeg);
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AslError (ASL_WARNING, ASL_MSG_MISSING_DEPENDENCY, Op,
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MsgBuffer);
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}
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}
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/* Get the name node */
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Next = Op->Asl.Child;
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/* Get the NumArguments node */
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Next = Next->Asl.Next;
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MethodInfo->NumArguments = (UINT8)
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(((UINT8) Next->Asl.Value.Integer) & 0x07);
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/* Get the SerializeRule and SyncLevel nodes, ignored here */
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Next = Next->Asl.Next;
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MethodInfo->ShouldBeSerialized = (UINT8) Next->Asl.Value.Integer;
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Next = Next->Asl.Next;
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ArgNode = Next;
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/* Get the ReturnType node */
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Next = Next->Asl.Next;
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NextType = Next->Asl.Child;
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while (NextType)
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{
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/* Get and map each of the ReturnTypes */
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MethodInfo->ValidReturnTypes |= AnMapObjTypeToBtype (NextType);
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NextType->Asl.ParseOpcode = PARSEOP_DEFAULT_ARG;
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NextType = NextType->Asl.Next;
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}
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/* Get the ParameterType node */
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Next = Next->Asl.Next;
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NextType = Next->Asl.Child;
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while (NextType)
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{
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if (NextType->Asl.ParseOpcode == PARSEOP_DEFAULT_ARG)
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{
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NextParamType = NextType->Asl.Child;
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while (NextParamType)
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{
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MethodInfo->ValidArgTypes[ActualArgs] |= AnMapObjTypeToBtype (NextParamType);
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NextParamType->Asl.ParseOpcode = PARSEOP_DEFAULT_ARG;
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NextParamType = NextParamType->Asl.Next;
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}
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}
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else
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{
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MethodInfo->ValidArgTypes[ActualArgs] =
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AnMapObjTypeToBtype (NextType);
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NextType->Asl.ParseOpcode = PARSEOP_DEFAULT_ARG;
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ActualArgs++;
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}
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NextType = NextType->Asl.Next;
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}
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if ((MethodInfo->NumArguments) &&
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(MethodInfo->NumArguments != ActualArgs))
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{
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/* error: Param list did not match number of args */
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}
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/* Allow numarguments == 0 for Function() */
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if ((!MethodInfo->NumArguments) && (ActualArgs))
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{
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MethodInfo->NumArguments = ActualArgs;
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ArgNode->Asl.Value.Integer |= ActualArgs;
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}
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/*
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* Actual arguments are initialized at method entry.
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* All other ArgX "registers" can be used as locals, so we
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* track their initialization.
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*/
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for (i = 0; i < MethodInfo->NumArguments; i++)
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{
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MethodInfo->ArgInitialized[i] = TRUE;
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}
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break;
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case PARSEOP_METHODCALL:
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if (MethodInfo &&
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(Op->Asl.Node == MethodInfo->Op->Asl.Node))
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{
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AslError (ASL_REMARK, ASL_MSG_RECURSION, Op, Op->Asl.ExternalName);
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}
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break;
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case PARSEOP_LOCAL0:
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case PARSEOP_LOCAL1:
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case PARSEOP_LOCAL2:
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case PARSEOP_LOCAL3:
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case PARSEOP_LOCAL4:
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case PARSEOP_LOCAL5:
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case PARSEOP_LOCAL6:
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case PARSEOP_LOCAL7:
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if (!MethodInfo)
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{
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/*
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* Local was used outside a control method, or there was an error
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* in the method declaration.
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*/
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AslError (ASL_REMARK, ASL_MSG_LOCAL_OUTSIDE_METHOD, Op, Op->Asl.ExternalName);
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return (AE_ERROR);
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}
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RegisterNumber = (Op->Asl.AmlOpcode & 0x000F);
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/*
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* If the local is being used as a target, mark the local
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* initialized
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*/
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if (Op->Asl.CompileFlags & NODE_IS_TARGET)
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{
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MethodInfo->LocalInitialized[RegisterNumber] = TRUE;
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}
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/*
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* Otherwise, this is a reference, check if the local
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* has been previously initialized.
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*
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* The only operator that accepts an uninitialized value is ObjectType()
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*/
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else if ((!MethodInfo->LocalInitialized[RegisterNumber]) &&
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(Op->Asl.Parent->Asl.ParseOpcode != PARSEOP_OBJECTTYPE))
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{
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LocalName[strlen (LocalName) -1] = (char) (RegisterNumber + 0x30);
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AslError (ASL_ERROR, ASL_MSG_LOCAL_INIT, Op, LocalName);
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}
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break;
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case PARSEOP_ARG0:
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case PARSEOP_ARG1:
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case PARSEOP_ARG2:
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case PARSEOP_ARG3:
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case PARSEOP_ARG4:
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case PARSEOP_ARG5:
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case PARSEOP_ARG6:
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if (!MethodInfo)
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{
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/*
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* Arg was used outside a control method, or there was an error
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* in the method declaration.
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*/
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AslError (ASL_REMARK, ASL_MSG_LOCAL_OUTSIDE_METHOD, Op, Op->Asl.ExternalName);
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return (AE_ERROR);
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}
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RegisterNumber = (Op->Asl.AmlOpcode & 0x000F) - 8;
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ArgName[strlen (ArgName) -1] = (char) (RegisterNumber + 0x30);
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/*
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* If the Arg is being used as a target, mark the local
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* initialized
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*/
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if (Op->Asl.CompileFlags & NODE_IS_TARGET)
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{
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MethodInfo->ArgInitialized[RegisterNumber] = TRUE;
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}
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/*
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* Otherwise, this is a reference, check if the Arg
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* has been previously initialized.
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*
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* The only operator that accepts an uninitialized value is ObjectType()
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*/
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else if ((!MethodInfo->ArgInitialized[RegisterNumber]) &&
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(Op->Asl.Parent->Asl.ParseOpcode != PARSEOP_OBJECTTYPE))
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{
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AslError (ASL_ERROR, ASL_MSG_ARG_INIT, Op, ArgName);
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}
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/* Flag this arg if it is not a "real" argument to the method */
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if (RegisterNumber >= MethodInfo->NumArguments)
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{
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AslError (ASL_REMARK, ASL_MSG_NOT_PARAMETER, Op, ArgName);
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}
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break;
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case PARSEOP_RETURN:
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if (!MethodInfo)
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{
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/*
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* Probably was an error in the method declaration,
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* no additional error here
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*/
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ACPI_WARNING ((AE_INFO, "%p, No parent method", Op));
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return (AE_ERROR);
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}
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/*
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* A child indicates a possible return value. A simple Return or
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* Return() is marked with NODE_IS_NULL_RETURN by the parser so
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* that it is not counted as a "real" return-with-value, although
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* the AML code that is actually emitted is Return(0). The AML
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* definition of Return has a required parameter, so we are
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* forced to convert a null return to Return(0).
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*/
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if ((Op->Asl.Child) &&
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(Op->Asl.Child->Asl.ParseOpcode != PARSEOP_DEFAULT_ARG) &&
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(!(Op->Asl.Child->Asl.CompileFlags & NODE_IS_NULL_RETURN)))
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{
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MethodInfo->NumReturnWithValue++;
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}
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else
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{
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MethodInfo->NumReturnNoValue++;
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}
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break;
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case PARSEOP_BREAK:
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case PARSEOP_CONTINUE:
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Next = Op->Asl.Parent;
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while (Next)
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{
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if (Next->Asl.ParseOpcode == PARSEOP_WHILE)
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{
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break;
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}
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Next = Next->Asl.Parent;
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}
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if (!Next)
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{
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AslError (ASL_ERROR, ASL_MSG_NO_WHILE, Op, NULL);
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}
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break;
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case PARSEOP_STALL:
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/* We can range check if the argument is an integer */
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if ((Op->Asl.Child->Asl.ParseOpcode == PARSEOP_INTEGER) &&
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(Op->Asl.Child->Asl.Value.Integer > ACPI_UINT8_MAX))
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{
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AslError (ASL_ERROR, ASL_MSG_INVALID_TIME, Op, NULL);
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}
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break;
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case PARSEOP_DEVICE:
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Next = Op->Asl.Child;
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if (!ApFindNameInScope (METHOD_NAME__HID, Next) &&
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!ApFindNameInScope (METHOD_NAME__ADR, Next))
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{
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AslError (ASL_WARNING, ASL_MSG_MISSING_DEPENDENCY, Op,
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"Device object requires a _HID or _ADR in same scope");
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}
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break;
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case PARSEOP_EVENT:
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case PARSEOP_MUTEX:
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case PARSEOP_OPERATIONREGION:
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case PARSEOP_POWERRESOURCE:
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case PARSEOP_PROCESSOR:
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case PARSEOP_THERMALZONE:
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/*
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* The first operand is a name to be created in the namespace.
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* Check against the reserved list.
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*/
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i = ApCheckForPredefinedName (Op, Op->Asl.NameSeg);
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if (i < ACPI_VALID_RESERVED_NAME_MAX)
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{
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AslError (ASL_ERROR, ASL_MSG_RESERVED_USE, Op, Op->Asl.ExternalName);
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}
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break;
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case PARSEOP_NAME:
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/* Typecheck any predefined names statically defined with Name() */
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ApCheckForPredefinedObject (Op, Op->Asl.NameSeg);
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/* Special typechecking for _HID */
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if (!strcmp (METHOD_NAME__HID, Op->Asl.NameSeg))
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{
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Next = Op->Asl.Child->Asl.Next;
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AnCheckId (Next, ASL_TYPE_HID);
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}
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/* Special typechecking for _CID */
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else if (!strcmp (METHOD_NAME__CID, Op->Asl.NameSeg))
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{
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Next = Op->Asl.Child->Asl.Next;
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if ((Next->Asl.ParseOpcode == PARSEOP_PACKAGE) ||
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(Next->Asl.ParseOpcode == PARSEOP_VAR_PACKAGE))
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{
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Next = Next->Asl.Child;
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while (Next)
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{
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AnCheckId (Next, ASL_TYPE_CID);
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Next = Next->Asl.Next;
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}
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}
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else
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{
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AnCheckId (Next, ASL_TYPE_CID);
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}
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}
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break;
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default:
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break;
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}
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/* Check for named object creation within a non-serialized method */
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MtCheckNamedObjectInMethod (Op, MethodInfo);
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return (AE_OK);
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}
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/*******************************************************************************
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*
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* FUNCTION: MtCheckNamedObjectInMethod
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*
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* PARAMETERS: Op - Current parser op
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* MethodInfo - Info for method being parsed
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*
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* RETURN: None
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*
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* DESCRIPTION: Detect if a non-serialized method is creating a named object,
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* which could possibly cause problems if two threads execute
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* the method concurrently. Emit a remark in this case.
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*
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******************************************************************************/
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void
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MtCheckNamedObjectInMethod (
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ACPI_PARSE_OBJECT *Op,
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ASL_METHOD_INFO *MethodInfo)
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{
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const ACPI_OPCODE_INFO *OpInfo;
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|
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/* We don't care about actual method declarations */
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if (Op->Asl.AmlOpcode == AML_METHOD_OP)
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{
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return;
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}
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/* Determine if we are creating a named object */
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OpInfo = AcpiPsGetOpcodeInfo (Op->Asl.AmlOpcode);
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if (OpInfo->Class == AML_CLASS_NAMED_OBJECT)
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{
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/*
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* If we have a named object created within a non-serialized method,
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* emit a remark that the method should be serialized.
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*
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* Reason: If a thread blocks within the method for any reason, and
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* another thread enters the method, the method will fail because an
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* attempt will be made to create the same object twice.
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*/
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if (MethodInfo && !MethodInfo->ShouldBeSerialized)
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{
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AslError (ASL_REMARK, ASL_MSG_SERIALIZED_REQUIRED, MethodInfo->Op,
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"due to creation of named objects within");
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/* Emit message only ONCE per method */
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MethodInfo->ShouldBeSerialized = TRUE;
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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: MtMethodAnalysisWalkEnd
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*
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* PARAMETERS: ASL_WALK_CALLBACK
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*
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* RETURN: Status
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*
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* DESCRIPTION: Ascending callback for analysis walk. Complete method
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* return analysis.
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*
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******************************************************************************/
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ACPI_STATUS
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MtMethodAnalysisWalkEnd (
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ACPI_PARSE_OBJECT *Op,
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UINT32 Level,
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void *Context)
|
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{
|
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ASL_ANALYSIS_WALK_INFO *WalkInfo = (ASL_ANALYSIS_WALK_INFO *) Context;
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ASL_METHOD_INFO *MethodInfo = WalkInfo->MethodStack;
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switch (Op->Asl.ParseOpcode)
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{
|
|
case PARSEOP_METHOD:
|
|
case PARSEOP_RETURN:
|
|
|
|
if (!MethodInfo)
|
|
{
|
|
printf ("No method info for method! [%s]\n", Op->Asl.Namepath);
|
|
AslError (ASL_ERROR, ASL_MSG_COMPILER_INTERNAL, Op,
|
|
"No method info for this method");
|
|
|
|
CmCleanupAndExit ();
|
|
return (AE_AML_INTERNAL);
|
|
}
|
|
break;
|
|
|
|
default:
|
|
|
|
break;
|
|
}
|
|
|
|
switch (Op->Asl.ParseOpcode)
|
|
{
|
|
case PARSEOP_METHOD:
|
|
|
|
WalkInfo->MethodStack = MethodInfo->Next;
|
|
|
|
/*
|
|
* Check if there is no return statement at the end of the
|
|
* method AND we can actually get there -- i.e., the execution
|
|
* of the method can possibly terminate without a return statement.
|
|
*/
|
|
if ((!AnLastStatementIsReturn (Op)) &&
|
|
(!(Op->Asl.CompileFlags & NODE_HAS_NO_EXIT)))
|
|
{
|
|
/*
|
|
* No return statement, and execution can possibly exit
|
|
* via this path. This is equivalent to Return ()
|
|
*/
|
|
MethodInfo->NumReturnNoValue++;
|
|
}
|
|
|
|
/*
|
|
* Check for case where some return statements have a return value
|
|
* and some do not. Exit without a return statement is a return with
|
|
* no value
|
|
*/
|
|
if (MethodInfo->NumReturnNoValue &&
|
|
MethodInfo->NumReturnWithValue)
|
|
{
|
|
AslError (ASL_WARNING, ASL_MSG_RETURN_TYPES, Op,
|
|
Op->Asl.ExternalName);
|
|
}
|
|
|
|
/*
|
|
* If there are any RETURN() statements with no value, or there is a
|
|
* control path that allows the method to exit without a return value,
|
|
* we mark the method as a method that does not return a value. This
|
|
* knowledge can be used to check method invocations that expect a
|
|
* returned value.
|
|
*/
|
|
if (MethodInfo->NumReturnNoValue)
|
|
{
|
|
if (MethodInfo->NumReturnWithValue)
|
|
{
|
|
Op->Asl.CompileFlags |= NODE_METHOD_SOME_NO_RETVAL;
|
|
}
|
|
else
|
|
{
|
|
Op->Asl.CompileFlags |= NODE_METHOD_NO_RETVAL;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Check predefined method names for correct return behavior
|
|
* and correct number of arguments. Also, some special checks
|
|
* For GPE and _REG methods.
|
|
*/
|
|
if (ApCheckForPredefinedMethod (Op, MethodInfo))
|
|
{
|
|
/* Special check for two names like _L01 and _E01 in same scope */
|
|
|
|
ApCheckForGpeNameConflict (Op);
|
|
|
|
/*
|
|
* Special check for _REG: Must have an operation region definition
|
|
* within the same scope!
|
|
*/
|
|
ApCheckRegMethod (Op);
|
|
}
|
|
|
|
ACPI_FREE (MethodInfo);
|
|
break;
|
|
|
|
case PARSEOP_NAME:
|
|
|
|
/* Special check for two names like _L01 and _E01 in same scope */
|
|
|
|
ApCheckForGpeNameConflict (Op);
|
|
break;
|
|
|
|
case PARSEOP_RETURN:
|
|
|
|
/*
|
|
* If the parent is a predefined method name, attempt to typecheck
|
|
* the return value. Only static types can be validated.
|
|
*/
|
|
ApCheckPredefinedReturnValue (Op, MethodInfo);
|
|
|
|
/*
|
|
* The parent block does not "exit" and continue execution -- the
|
|
* method is terminated here with the Return() statement.
|
|
*/
|
|
Op->Asl.Parent->Asl.CompileFlags |= NODE_HAS_NO_EXIT;
|
|
|
|
/* Used in the "typing" pass later */
|
|
|
|
Op->Asl.ParentMethod = MethodInfo->Op;
|
|
|
|
/*
|
|
* If there is a peer node after the return statement, then this
|
|
* node is unreachable code -- i.e., it won't be executed because of
|
|
* the preceding Return() statement.
|
|
*/
|
|
if (Op->Asl.Next)
|
|
{
|
|
AslError (ASL_WARNING, ASL_MSG_UNREACHABLE_CODE, Op->Asl.Next, NULL);
|
|
}
|
|
break;
|
|
|
|
case PARSEOP_IF:
|
|
|
|
if ((Op->Asl.CompileFlags & NODE_HAS_NO_EXIT) &&
|
|
(Op->Asl.Next) &&
|
|
(Op->Asl.Next->Asl.ParseOpcode == PARSEOP_ELSE))
|
|
{
|
|
/*
|
|
* This IF has a corresponding ELSE. The IF block has no exit,
|
|
* (it contains an unconditional Return)
|
|
* mark the ELSE block to remember this fact.
|
|
*/
|
|
Op->Asl.Next->Asl.CompileFlags |= NODE_IF_HAS_NO_EXIT;
|
|
}
|
|
break;
|
|
|
|
case PARSEOP_ELSE:
|
|
|
|
if ((Op->Asl.CompileFlags & NODE_HAS_NO_EXIT) &&
|
|
(Op->Asl.CompileFlags & NODE_IF_HAS_NO_EXIT))
|
|
{
|
|
/*
|
|
* This ELSE block has no exit and the corresponding IF block
|
|
* has no exit either. Therefore, the parent node has no exit.
|
|
*/
|
|
Op->Asl.Parent->Asl.CompileFlags |= NODE_HAS_NO_EXIT;
|
|
}
|
|
break;
|
|
|
|
|
|
default:
|
|
|
|
if ((Op->Asl.CompileFlags & NODE_HAS_NO_EXIT) &&
|
|
(Op->Asl.Parent))
|
|
{
|
|
/* If this node has no exit, then the parent has no exit either */
|
|
|
|
Op->Asl.Parent->Asl.CompileFlags |= NODE_HAS_NO_EXIT;
|
|
}
|
|
break;
|
|
}
|
|
|
|
return (AE_OK);
|
|
}
|