/******************************************************************************
*
* Module Name: aslopt- Compiler optimizations
*
*****************************************************************************/
/******************************************************************************
*
* 1. Copyright Notice
*
* Some or all of this work - Copyright (c) 1999 - 2011, Intel Corp.
* All rights reserved.
*
* 2. License
*
* 2.1. This is your license from Intel Corp. under its intellectual property
* rights. You may have additional license terms from the party that provided
* you this software, covering your right to use that party's intellectual
* property rights.
*
* 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a
* copy of the source code appearing in this file ("Covered Code") an
* irrevocable, perpetual, worldwide license under Intel's copyrights in the
* base code distributed originally by Intel ("Original Intel Code") to copy,
* make derivatives, distribute, use and display any portion of the Covered
* Code in any form, with the right to sublicense such rights; and
*
* 2.3. Intel grants Licensee a non-exclusive and non-transferable patent
* license (with the right to sublicense), under only those claims of Intel
* patents that are infringed by the Original Intel Code, to make, use, sell,
* offer to sell, and import the Covered Code and derivative works thereof
* solely to the minimum extent necessary to exercise the above copyright
* license, and in no event shall the patent license extend to any additions
* to or modifications of the Original Intel Code. No other license or right
* is granted directly or by implication, estoppel or otherwise;
*
* The above copyright and patent license is granted only if the following
* conditions are met:
*
* 3. Conditions
*
* 3.1. Redistribution of Source with Rights to Further Distribute Source.
* Redistribution of source code of any substantial portion of the Covered
* Code or modification with rights to further distribute source must include
* the above Copyright Notice, the above License, this list of Conditions,
* and the following Disclaimer and Export Compliance provision. In addition,
* Licensee must cause all Covered Code to which Licensee contributes to
* contain a file documenting the changes Licensee made to create that Covered
* Code and the date of any change. Licensee must include in that file the
* documentation of any changes made by any predecessor Licensee. Licensee
* must include a prominent statement that the modification is derived,
* directly or indirectly, from Original Intel Code.
*
* 3.2. Redistribution of Source with no Rights to Further Distribute Source.
* Redistribution of source code of any substantial portion of the Covered
* Code or modification without rights to further distribute source must
* include the following Disclaimer and Export Compliance provision in the
* documentation and/or other materials provided with distribution. In
* addition, Licensee may not authorize further sublicense of source of any
* portion of the Covered Code, and must include terms to the effect that the
* license from Licensee to its licensee is limited to the intellectual
* property embodied in the software Licensee provides to its licensee, and
* not to intellectual property embodied in modifications its licensee may
* make.
*
* 3.3. Redistribution of Executable. Redistribution in executable form of any
* substantial portion of the Covered Code or modification must reproduce the
* above Copyright Notice, and the following Disclaimer and Export Compliance
* provision in the documentation and/or other materials provided with the
* distribution.
*
* 3.4. Intel retains all right, title, and interest in and to the Original
* Intel Code.
*
* 3.5. Neither the name Intel nor any other trademark owned or controlled by
* Intel shall be used in advertising or otherwise to promote the sale, use or
* other dealings in products derived from or relating to the Covered Code
* without prior written authorization from Intel.
*
* 4. Disclaimer and Export Compliance
*
* 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED
* HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE
* IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE,
* INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY
* UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY
* IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A
* PARTICULAR PURPOSE.
*
* 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES
* OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR
* COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT,
* SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY
* CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL
* HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS
* SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY
* LIMITED REMEDY.
*
* 4.3. Licensee shall not export, either directly or indirectly, any of this
* software or system incorporating such software without first obtaining any
* required license or other approval from the U. S. Department of Commerce or
* any other agency or department of the United States Government. In the
* event Licensee exports any such software from the United States or
* re-exports any such software from a foreign destination, Licensee shall
* ensure that the distribution and export/re-export of the software is in
* compliance with all laws, regulations, orders, or other restrictions of the
* U.S. Export Administration Regulations. Licensee agrees that neither it nor
* any of its subsidiaries will export/re-export any technical data, process,
* software, or service, directly or indirectly, to any country for which the
* United States government or any agency thereof requires an export license,
* other governmental approval, or letter of assurance, without first obtaining
* such license, approval or letter.
*
*****************************************************************************/
#include "aslcompiler.h"
#include "aslcompiler.y.h"
#include "acparser.h"
#include "amlcode.h"
#include "acnamesp.h"
#define _COMPONENT ACPI_COMPILER
ACPI_MODULE_NAME ("aslopt")
static UINT32 OptTotal = 0;
/* Local prototypes */
static ACPI_STATUS
OptSearchToRoot (
ACPI_PARSE_OBJECT *Op,
ACPI_WALK_STATE *WalkState,
ACPI_NAMESPACE_NODE *CurrentNode,
ACPI_NAMESPACE_NODE *TargetNode,
ACPI_BUFFER *TargetPath,
char **NewPath);
static ACPI_STATUS
OptBuildShortestPath (
ACPI_PARSE_OBJECT *Op,
ACPI_WALK_STATE *WalkState,
ACPI_NAMESPACE_NODE *CurrentNode,
ACPI_NAMESPACE_NODE *TargetNode,
ACPI_BUFFER *CurrentPath,
ACPI_BUFFER *TargetPath,
ACPI_SIZE AmlNameStringLength,
UINT8 IsDeclaration,
char **ReturnNewPath);
static ACPI_STATUS
OptOptimizeNameDeclaration (
ACPI_PARSE_OBJECT *Op,
ACPI_WALK_STATE *WalkState,
ACPI_NAMESPACE_NODE *CurrentNode,
ACPI_NAMESPACE_NODE *TargetNode,
char *AmlNameString,
char **NewPath);
/*******************************************************************************
*
* FUNCTION: OptSearchToRoot
*
* PARAMETERS: Op - Current parser op
* WalkState - Current state
* CurrentNode - Where we are in the namespace
* TargetNode - Node to which we are referring
* TargetPath - External full path to the target node
* NewPath - Where the optimized path is returned
*
* RETURN: Status
*
* DESCRIPTION: Attempt to optimize a reference to a single 4-character ACPI
* name utilizing the search-to-root name resolution algorithm
* that is used by AML interpreters.
*
******************************************************************************/
static ACPI_STATUS
OptSearchToRoot (
ACPI_PARSE_OBJECT *Op,
ACPI_WALK_STATE *WalkState,
ACPI_NAMESPACE_NODE *CurrentNode,
ACPI_NAMESPACE_NODE *TargetNode,
ACPI_BUFFER *TargetPath,
char **NewPath)
{
ACPI_NAMESPACE_NODE *Node;
ACPI_GENERIC_STATE ScopeInfo;
ACPI_STATUS Status;
char *Path;
ACPI_FUNCTION_NAME (OptSearchToRoot);
/*
* Check if search-to-root can be utilized. Use the last NameSeg of
* the NamePath and 1) See if can be found and 2) If found, make
* sure that it is the same node that we want. If there is another
* name in the search path before the one we want, the nodes will
* not match, and we cannot use this optimization.
*/
Path = &(((char *) TargetPath->Pointer)[TargetPath->Length -
ACPI_NAME_SIZE]),
ScopeInfo.Scope.Node = CurrentNode;
/* Lookup the NameSeg using SEARCH_PARENT (search-to-root) */
Status = AcpiNsLookup (&ScopeInfo, Path, ACPI_TYPE_ANY, ACPI_IMODE_EXECUTE,
ACPI_NS_SEARCH_PARENT | ACPI_NS_DONT_OPEN_SCOPE,
WalkState, &(Node));
if (ACPI_FAILURE (Status))
{
return (Status);
}
/*
* We found the name, but we must check to make sure that the node
* matches. Otherwise, there is another identical name in the search
* path that precludes the use of this optimization.
*/
if (Node != TargetNode)
{
/*
* This means that another object with the same name was found first,
* and we cannot use this optimization.
*/
return (AE_NOT_FOUND);
}
/* Found the node, we can use this optimization */
ACPI_DEBUG_PRINT_RAW ((ACPI_DB_OPTIMIZATIONS,
"NAMESEG: %-24s", Path));
/* We must allocate a new string for the name (TargetPath gets deleted) */
*NewPath = ACPI_ALLOCATE_ZEROED (ACPI_NAME_SIZE + 1);
ACPI_STRCPY (*NewPath, Path);
if (ACPI_STRNCMP (*NewPath, "_T_", 3))
{
AslError (ASL_OPTIMIZATION, ASL_MSG_SINGLE_NAME_OPTIMIZATION, Op,
*NewPath);
}
return (AE_OK);
}
/*******************************************************************************
*
* FUNCTION: OptBuildShortestPath
*
* PARAMETERS: Op - Current parser op
* WalkState - Current state
* CurrentNode - Where we are in the namespace
* TargetNode - Node to which we are referring
* CurrentPath - External full path to the current node
* TargetPath - External full path to the target node
* AmlNameStringLength - Length of the original namepath
* IsDeclaration - TRUE for declaration, FALSE for reference
* ReturnNewPath - Where the optimized path is returned
*
* RETURN: Status
*
* DESCRIPTION: Build an optimal NamePath using carats
*
******************************************************************************/
static ACPI_STATUS
OptBuildShortestPath (
ACPI_PARSE_OBJECT *Op,
ACPI_WALK_STATE *WalkState,
ACPI_NAMESPACE_NODE *CurrentNode,
ACPI_NAMESPACE_NODE *TargetNode,
ACPI_BUFFER *CurrentPath,
ACPI_BUFFER *TargetPath,
ACPI_SIZE AmlNameStringLength,
UINT8 IsDeclaration,
char **ReturnNewPath)
{
UINT32 NumCommonSegments;
UINT32 MaxCommonSegments;
UINT32 Index;
UINT32 NumCarats;
UINT32 i;
char *NewPath;
char *NewPathExternal;
ACPI_NAMESPACE_NODE *Node;
ACPI_GENERIC_STATE ScopeInfo;
ACPI_STATUS Status;
BOOLEAN SubPath = FALSE;
ACPI_FUNCTION_NAME (OptBuildShortestPath);
ScopeInfo.Scope.Node = CurrentNode;
/*
* Determine the maximum number of NameSegs that the Target and Current paths
* can possibly have in common. (To optimize, we have to have at least 1)
*
* Note: The external NamePath string lengths are always a multiple of 5
* (ACPI_NAME_SIZE + separator)
*/
MaxCommonSegments = TargetPath->Length / ACPI_PATH_SEGMENT_LENGTH;
if (CurrentPath->Length < TargetPath->Length)
{
MaxCommonSegments = CurrentPath->Length / ACPI_PATH_SEGMENT_LENGTH;
}
/*
* Determine how many NameSegs the two paths have in common.
* (Starting from the root)
*/
for (NumCommonSegments = 0;
NumCommonSegments < MaxCommonSegments;
NumCommonSegments++)
{
/* Compare two single NameSegs */
if (ACPI_STRNCMP (
&((char *) TargetPath->Pointer)[(NumCommonSegments *
ACPI_PATH_SEGMENT_LENGTH) + 1],
&((char *) CurrentPath->Pointer)[(NumCommonSegments *
ACPI_PATH_SEGMENT_LENGTH) + 1],
ACPI_NAME_SIZE))
{
/* Mismatch */
break;
}
}
ACPI_DEBUG_PRINT_RAW ((ACPI_DB_OPTIMIZATIONS, " COMMON: %u",
NumCommonSegments));
/* There must be at least 1 common NameSeg in order to optimize */
if (NumCommonSegments == 0)
{
return (AE_NOT_FOUND);
}
if (NumCommonSegments == MaxCommonSegments)
{
if (CurrentPath->Length == TargetPath->Length)
{
ACPI_DEBUG_PRINT_RAW ((ACPI_DB_OPTIMIZATIONS, " SAME PATH"));
return (AE_NOT_FOUND);
}
else
{
ACPI_DEBUG_PRINT_RAW ((ACPI_DB_OPTIMIZATIONS, " SUBPATH"));
SubPath = TRUE;
}
}
/* Determine how many prefix Carats are required */
NumCarats = (CurrentPath->Length / ACPI_PATH_SEGMENT_LENGTH) -
NumCommonSegments;
/*
* Construct a new target string
*/
NewPathExternal = ACPI_ALLOCATE_ZEROED (
TargetPath->Length + NumCarats + 1);
/* Insert the Carats into the Target string */
for (i = 0; i < NumCarats; i++)
{
NewPathExternal[i] = '^';
}
/*
* Copy only the necessary (optimal) segments from the original
* target string
*/
Index = (NumCommonSegments * ACPI_PATH_SEGMENT_LENGTH) + 1;
/* Special handling for exact subpath in a name declaration */
if (IsDeclaration && SubPath && (CurrentPath->Length > TargetPath->Length))
{
/*
* The current path is longer than the target, and the target is a
* subpath of the current path. We must include one more NameSeg of
* the target path
*/
Index -= ACPI_PATH_SEGMENT_LENGTH;
/* Special handling for Scope() operator */
if (Op->Asl.AmlOpcode == AML_SCOPE_OP)
{
NewPathExternal[i] = '^';
i++;
ACPI_DEBUG_PRINT_RAW ((ACPI_DB_OPTIMIZATIONS, "(EXTRA ^)"));
}
}
/* Make sure we haven't gone off the end of the target path */
if (Index > TargetPath->Length)
{
Index = TargetPath->Length;
}
ACPI_STRCPY (&NewPathExternal[i], &((char *) TargetPath->Pointer)[Index]);
ACPI_DEBUG_PRINT_RAW ((ACPI_DB_OPTIMIZATIONS, " %-24s", NewPathExternal));
/*
* Internalize the new target string and check it against the original
* string to make sure that this is in fact an optimization. If the
* original string is already optimal, there is no point in continuing.
*/
Status = AcpiNsInternalizeName (NewPathExternal, &NewPath);
if (ACPI_FAILURE (Status))
{
AslCoreSubsystemError (Op, Status, "Internalizing new NamePath",
ASL_NO_ABORT);
ACPI_FREE (NewPathExternal);
return (Status);
}
if (ACPI_STRLEN (NewPath) >= AmlNameStringLength)
{
ACPI_DEBUG_PRINT_RAW ((ACPI_DB_OPTIMIZATIONS,
" NOT SHORTER (New %u old %u)",
(UINT32) ACPI_STRLEN (NewPath), (UINT32) AmlNameStringLength));
ACPI_FREE (NewPathExternal);
return (AE_NOT_FOUND);
}
/*
* Check to make sure that the optimization finds the node we are
* looking for. This is simply a sanity check on the new
* path that has been created.
*/
Status = AcpiNsLookup (&ScopeInfo, NewPath,
ACPI_TYPE_ANY, ACPI_IMODE_EXECUTE,
ACPI_NS_DONT_OPEN_SCOPE, WalkState, &(Node));
if (ACPI_SUCCESS (Status))
{
/* Found the namepath, but make sure the node is correct */
if (Node == TargetNode)
{
/* The lookup matched the node, accept this optimization */
AslError (ASL_OPTIMIZATION, ASL_MSG_NAME_OPTIMIZATION,
Op, NewPathExternal);
*ReturnNewPath = NewPath;
}
else
{
/* Node is not correct, do not use this optimization */
Status = AE_NOT_FOUND;
ACPI_DEBUG_PRINT_RAW ((ACPI_DB_OPTIMIZATIONS, " ***** WRONG NODE"));
AslError (ASL_WARNING, ASL_MSG_COMPILER_INTERNAL, Op,
"Not using optimized name - found wrong node");
}
}
else
{
/* The lookup failed, we obviously cannot use this optimization */
ACPI_DEBUG_PRINT_RAW ((ACPI_DB_OPTIMIZATIONS, " ***** NOT FOUND"));
AslError (ASL_WARNING, ASL_MSG_COMPILER_INTERNAL, Op,
"Not using optimized name - did not find node");
}
ACPI_FREE (NewPathExternal);
return (Status);
}
/*******************************************************************************
*
* FUNCTION: OptOptimizeNameDeclaration
*
* PARAMETERS: Op - Current parser op
* WalkState - Current state
* CurrentNode - Where we are in the namespace
* AmlNameString - Unoptimized namepath
* NewPath - Where the optimized path is returned
*
* RETURN: Status. AE_OK If path is optimized
*
* DESCRIPTION: Perform a simple optimization of removing an extraneous
* backslash prefix if we are already at the root scope.
*
******************************************************************************/
static ACPI_STATUS
OptOptimizeNameDeclaration (
ACPI_PARSE_OBJECT *Op,
ACPI_WALK_STATE *WalkState,
ACPI_NAMESPACE_NODE *CurrentNode,
ACPI_NAMESPACE_NODE *TargetNode,
char *AmlNameString,
char **NewPath)
{
ACPI_STATUS Status;
char *NewPathExternal;
ACPI_GENERIC_STATE ScopeInfo;
ACPI_NAMESPACE_NODE *Node;
ACPI_FUNCTION_TRACE (OptOptimizeNameDeclaration);
if (((CurrentNode == AcpiGbl_RootNode) ||
(Op->Common.Parent->Asl.ParseOpcode == PARSEOP_DEFINITIONBLOCK)) &&
(AmlNameString[0] == '\\'))
{
/*
* The current scope is the root, and the namepath has a root prefix
* that is therefore extraneous. Remove it.
*/
*NewPath = &AmlNameString[1];
/* Debug output */
Status = AcpiNsExternalizeName (ACPI_UINT32_MAX, *NewPath,
NULL, &NewPathExternal);
if (ACPI_FAILURE (Status))
{
AslCoreSubsystemError (Op, Status, "Externalizing NamePath",
ASL_NO_ABORT);
return (Status);
}
/*
* Check to make sure that the optimization finds the node we are
* looking for. This is simply a sanity check on the new
* path that has been created.
*/
ScopeInfo.Scope.Node = CurrentNode;
Status = AcpiNsLookup (&ScopeInfo, *NewPath,
ACPI_TYPE_ANY, ACPI_IMODE_EXECUTE,
ACPI_NS_DONT_OPEN_SCOPE, WalkState, &(Node));
if (ACPI_SUCCESS (Status))
{
/* Found the namepath, but make sure the node is correct */
if (Node == TargetNode)
{
/* The lookup matched the node, accept this optimization */
AslError (ASL_OPTIMIZATION, ASL_MSG_NAME_OPTIMIZATION,
Op, NewPathExternal);
ACPI_DEBUG_PRINT_RAW ((ACPI_DB_OPTIMIZATIONS,
"AT ROOT: %-24s", NewPathExternal));
}
else
{
/* Node is not correct, do not use this optimization */
Status = AE_NOT_FOUND;
ACPI_DEBUG_PRINT_RAW ((ACPI_DB_OPTIMIZATIONS,
" ***** WRONG NODE"));
AslError (ASL_WARNING, ASL_MSG_COMPILER_INTERNAL, Op,
"Not using optimized name - found wrong node");
}
}
else
{
/* The lookup failed, we obviously cannot use this optimization */
ACPI_DEBUG_PRINT_RAW ((ACPI_DB_OPTIMIZATIONS,
" ***** NOT FOUND"));
AslError (ASL_WARNING, ASL_MSG_COMPILER_INTERNAL, Op,
"Not using optimized name - did not find node");
}
ACPI_FREE (NewPathExternal);
return (Status);
}
/* Could not optimize */
return (AE_NOT_FOUND);
}
/*******************************************************************************
*
* FUNCTION: OptOptimizeNamePath
*
* PARAMETERS: Op - Current parser op
* Flags - Opcode info flags
* WalkState - Current state
* AmlNameString - Unoptimized namepath
* TargetNode - Node to which AmlNameString refers
*
* RETURN: None. If path is optimized, the Op is updated with new path
*
* DESCRIPTION: Optimize a Named Declaration or Reference to the minimal length.
* Must take into account both the current location in the
* namespace and the actual reference path.
*
******************************************************************************/
void
OptOptimizeNamePath (
ACPI_PARSE_OBJECT *Op,
UINT32 Flags,
ACPI_WALK_STATE *WalkState,
char *AmlNameString,
ACPI_NAMESPACE_NODE *TargetNode)
{
ACPI_STATUS Status;
ACPI_BUFFER TargetPath;
ACPI_BUFFER CurrentPath;
ACPI_SIZE AmlNameStringLength;
ACPI_NAMESPACE_NODE *CurrentNode;
char *ExternalNameString;
char *NewPath = NULL;
ACPI_SIZE HowMuchShorter;
ACPI_PARSE_OBJECT *NextOp;
ACPI_FUNCTION_TRACE (OptOptimizeNamePath);
/* This is an optional optimization */
if (!Gbl_ReferenceOptimizationFlag)
{
return_VOID;
}
/* Various required items */
if (!TargetNode || !WalkState || !AmlNameString || !Op->Common.Parent)
{
return_VOID;
}
ACPI_DEBUG_PRINT_RAW ((ACPI_DB_OPTIMIZATIONS, "%5d [%12.12s] [%12.12s] ",
Op->Asl.LogicalLineNumber,
AcpiPsGetOpcodeName (Op->Common.Parent->Common.AmlOpcode),
AcpiPsGetOpcodeName (Op->Common.AmlOpcode)));
if (!(Flags & (AML_NAMED | AML_CREATE)))
{
if (Op->Asl.CompileFlags & NODE_IS_NAME_DECLARATION)
{
/* We don't want to fuss with actual name declaration nodes here */
ACPI_DEBUG_PRINT_RAW ((ACPI_DB_OPTIMIZATIONS,
"******* NAME DECLARATION\n"));
return_VOID;
}
}
/*
* The original path must be longer than one NameSeg (4 chars) for there
* to be any possibility that it can be optimized to a shorter string
*/
AmlNameStringLength = ACPI_STRLEN (AmlNameString);
if (AmlNameStringLength <= ACPI_NAME_SIZE)
{
ACPI_DEBUG_PRINT_RAW ((ACPI_DB_OPTIMIZATIONS,
"NAMESEG %4.4s\n", AmlNameString));
return_VOID;
}
/*
* We need to obtain the node that represents the current scope -- where
* we are right now in the namespace. We will compare this path
* against the Namepath, looking for commonality.
*/
CurrentNode = AcpiGbl_RootNode;
if (WalkState->ScopeInfo)
{
CurrentNode = WalkState->ScopeInfo->Scope.Node;
}
if (Flags & (AML_NAMED | AML_CREATE))
{
/* This is the declaration of a new name */
ACPI_DEBUG_PRINT_RAW ((ACPI_DB_OPTIMIZATIONS, "NAME"));
/*
* The node of interest is the parent of this node
* (the containing scope)
*/
CurrentNode = Op->Asl.Parent->Asl.Node;
if (!CurrentNode)
{
CurrentNode = AcpiGbl_RootNode;
}
}
else
{
/* This is a reference to an existing named object */
ACPI_DEBUG_PRINT_RAW ((ACPI_DB_OPTIMIZATIONS, "REF "));
}
/*
* Obtain the full paths to the two nodes that we are interested in
* (Target and current namespace location) in external
* format -- something we can easily manipulate
*/
TargetPath.Length = ACPI_ALLOCATE_LOCAL_BUFFER;
Status = AcpiNsHandleToPathname (TargetNode, &TargetPath);
if (ACPI_FAILURE (Status))
{
AslCoreSubsystemError (Op, Status, "Getting Target NamePath",
ASL_NO_ABORT);
return_VOID;
}
TargetPath.Length--; /* Subtract one for null terminator */
/* CurrentPath is the path to this scope (where we are in the namespace) */
CurrentPath.Length = ACPI_ALLOCATE_LOCAL_BUFFER;
Status = AcpiNsHandleToPathname (CurrentNode, &CurrentPath);
if (ACPI_FAILURE (Status))
{
AslCoreSubsystemError (Op, Status, "Getting Current NamePath",
ASL_NO_ABORT);
return_VOID;
}
CurrentPath.Length--; /* Subtract one for null terminator */
/* Debug output only */
Status = AcpiNsExternalizeName (ACPI_UINT32_MAX, AmlNameString,
NULL, &ExternalNameString);
if (ACPI_FAILURE (Status))
{
AslCoreSubsystemError (Op, Status, "Externalizing NamePath",
ASL_NO_ABORT);
return_VOID;
}
ACPI_DEBUG_PRINT_RAW ((ACPI_DB_OPTIMIZATIONS,
"%37s (%2u) ==> %-32s(%2u) %-32s",
(char *) CurrentPath.Pointer, (UINT32) CurrentPath.Length,
(char *) TargetPath.Pointer, (UINT32) TargetPath.Length, ExternalNameString));
ACPI_FREE (ExternalNameString);
/*
* Attempt an optmization depending on the type of namepath
*/
if (Flags & (AML_NAMED | AML_CREATE))
{
/*
* This is a named opcode and the namepath is a name declaration, not
* a reference.
*/
Status = OptOptimizeNameDeclaration (Op, WalkState, CurrentNode,
TargetNode, AmlNameString, &NewPath);
if (ACPI_FAILURE (Status))
{
/*
* 2) now attempt to
* optimize the namestring with carats (up-arrow)
*/
Status = OptBuildShortestPath (Op, WalkState, CurrentNode,
TargetNode, &CurrentPath, &TargetPath,
AmlNameStringLength, 1, &NewPath);
}
}
else
{
/*
* This is a reference to an existing named object
*
* 1) Check if search-to-root can be utilized using the last
* NameSeg of the NamePath
*/
Status = OptSearchToRoot (Op, WalkState, CurrentNode,
TargetNode, &TargetPath, &NewPath);
if (ACPI_FAILURE (Status))
{
/*
* 2) Search-to-root could not be used, now attempt to
* optimize the namestring with carats (up-arrow)
*/
Status = OptBuildShortestPath (Op, WalkState, CurrentNode,
TargetNode, &CurrentPath, &TargetPath,
AmlNameStringLength, 0, &NewPath);
}
}
/*
* Success from above indicates that the NamePath was successfully
* optimized. We need to update the parse op with the new name
*/
if (ACPI_SUCCESS (Status))
{
HowMuchShorter = (AmlNameStringLength - ACPI_STRLEN (NewPath));
OptTotal += HowMuchShorter;
ACPI_DEBUG_PRINT_RAW ((ACPI_DB_OPTIMIZATIONS, " REDUCED %2u (%u)",
(UINT32) HowMuchShorter, OptTotal));
if (Flags & AML_NAMED)
{
if (Op->Asl.AmlOpcode == AML_ALIAS_OP)
{
/*
* ALIAS is the only oddball opcode, the name declaration
* (alias name) is the second operand
*/
Op->Asl.Child->Asl.Next->Asl.Value.String = NewPath;
Op->Asl.Child->Asl.Next->Asl.AmlLength = ACPI_STRLEN (NewPath);
}
else
{
Op->Asl.Child->Asl.Value.String = NewPath;
Op->Asl.Child->Asl.AmlLength = ACPI_STRLEN (NewPath);
}
}
else if (Flags & AML_CREATE)
{
/* Name must appear as the last parameter */
NextOp = Op->Asl.Child;
while (!(NextOp->Asl.CompileFlags & NODE_IS_NAME_DECLARATION))
{
NextOp = NextOp->Asl.Next;
}
/* Update the parse node with the new NamePath */
NextOp->Asl.Value.String = NewPath;
NextOp->Asl.AmlLength = ACPI_STRLEN (NewPath);
}
else
{
/* Update the parse node with the new NamePath */
Op->Asl.Value.String = NewPath;
Op->Asl.AmlLength = ACPI_STRLEN (NewPath);
}
}
else
{
ACPI_DEBUG_PRINT_RAW ((ACPI_DB_OPTIMIZATIONS, " ALREADY OPTIMAL"));
}
/* Cleanup path buffers */
ACPI_FREE (TargetPath.Pointer);
ACPI_FREE (CurrentPath.Pointer);
ACPI_DEBUG_PRINT_RAW ((ACPI_DB_OPTIMIZATIONS, "\n"));
return_VOID;
}