564 lines
18 KiB
C
564 lines
18 KiB
C
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/******************************************************************************
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*
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* Module Name: aslfold - Constant folding
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*
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*****************************************************************************/
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/******************************************************************************
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*
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* 1. Copyright Notice
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*
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* Some or all of this work - Copyright (c) 1999 - 2011, Intel Corp.
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* All rights reserved.
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*
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* 2. License
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*
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* 2.1. This is your license from Intel Corp. under its intellectual property
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* rights. You may have additional license terms from the party that provided
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* you this software, covering your right to use that party's intellectual
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* property rights.
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*
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* 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a
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* copy of the source code appearing in this file ("Covered Code") an
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* irrevocable, perpetual, worldwide license under Intel's copyrights in the
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* base code distributed originally by Intel ("Original Intel Code") to copy,
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* make derivatives, distribute, use and display any portion of the Covered
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* Code in any form, with the right to sublicense such rights; and
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*
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* 2.3. Intel grants Licensee a non-exclusive and non-transferable patent
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* license (with the right to sublicense), under only those claims of Intel
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* patents that are infringed by the Original Intel Code, to make, use, sell,
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* offer to sell, and import the Covered Code and derivative works thereof
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* solely to the minimum extent necessary to exercise the above copyright
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* license, and in no event shall the patent license extend to any additions
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* to or modifications of the Original Intel Code. No other license or right
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* is granted directly or by implication, estoppel or otherwise;
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*
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* The above copyright and patent license is granted only if the following
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* conditions are met:
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*
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* 3. Conditions
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*
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* 3.1. Redistribution of Source with Rights to Further Distribute Source.
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* Redistribution of source code of any substantial portion of the Covered
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* Code or modification with rights to further distribute source must include
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* the above Copyright Notice, the above License, this list of Conditions,
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* and the following Disclaimer and Export Compliance provision. In addition,
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* Licensee must cause all Covered Code to which Licensee contributes to
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* contain a file documenting the changes Licensee made to create that Covered
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* Code and the date of any change. Licensee must include in that file the
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* documentation of any changes made by any predecessor Licensee. Licensee
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* must include a prominent statement that the modification is derived,
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* directly or indirectly, from Original Intel Code.
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*
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* 3.2. Redistribution of Source with no Rights to Further Distribute Source.
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* Redistribution of source code of any substantial portion of the Covered
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* Code or modification without rights to further distribute source must
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* include the following Disclaimer and Export Compliance provision in the
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* documentation and/or other materials provided with distribution. In
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* addition, Licensee may not authorize further sublicense of source of any
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* portion of the Covered Code, and must include terms to the effect that the
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* license from Licensee to its licensee is limited to the intellectual
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* property embodied in the software Licensee provides to its licensee, and
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* not to intellectual property embodied in modifications its licensee may
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* make.
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*
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* 3.3. Redistribution of Executable. Redistribution in executable form of any
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* substantial portion of the Covered Code or modification must reproduce the
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* above Copyright Notice, and the following Disclaimer and Export Compliance
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* provision in the documentation and/or other materials provided with the
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* distribution.
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*
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* 3.4. Intel retains all right, title, and interest in and to the Original
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* Intel Code.
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*
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* 3.5. Neither the name Intel nor any other trademark owned or controlled by
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* Intel shall be used in advertising or otherwise to promote the sale, use or
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* other dealings in products derived from or relating to the Covered Code
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* without prior written authorization from Intel.
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*
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* 4. Disclaimer and Export Compliance
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*
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* 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED
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* HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE
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* IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE,
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* INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY
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* UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY
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* IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A
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* PARTICULAR PURPOSE.
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*
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* 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES
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* OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR
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* COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT,
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* SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY
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* CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL
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* HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS
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* SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY
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* LIMITED REMEDY.
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*
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* 4.3. Licensee shall not export, either directly or indirectly, any of this
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* software or system incorporating such software without first obtaining any
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* required license or other approval from the U. S. Department of Commerce or
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* any other agency or department of the United States Government. In the
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* event Licensee exports any such software from the United States or
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* re-exports any such software from a foreign destination, Licensee shall
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* ensure that the distribution and export/re-export of the software is in
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* compliance with all laws, regulations, orders, or other restrictions of the
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* U.S. Export Administration Regulations. Licensee agrees that neither it nor
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* any of its subsidiaries will export/re-export any technical data, process,
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* software, or service, directly or indirectly, to any country for which the
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* United States government or any agency thereof requires an export license,
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* other governmental approval, or letter of assurance, without first obtaining
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* such license, approval or letter.
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*
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*****************************************************************************/
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#include "aslcompiler.h"
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#include "aslcompiler.y.h"
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#include "amlcode.h"
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#include "acdispat.h"
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#include "acparser.h"
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#define _COMPONENT ACPI_COMPILER
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ACPI_MODULE_NAME ("aslfold")
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/* Local prototypes */
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static ACPI_STATUS
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OpcAmlEvaluationWalk1 (
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ACPI_PARSE_OBJECT *Op,
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UINT32 Level,
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void *Context);
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static ACPI_STATUS
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OpcAmlEvaluationWalk2 (
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ACPI_PARSE_OBJECT *Op,
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UINT32 Level,
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void *Context);
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static ACPI_STATUS
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OpcAmlCheckForConstant (
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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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*
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* FUNCTION: OpcAmlEvaluationWalk1
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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 AML execution of constant subtrees
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*
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******************************************************************************/
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static ACPI_STATUS
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OpcAmlEvaluationWalk1 (
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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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ACPI_WALK_STATE *WalkState = Context;
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ACPI_STATUS Status;
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ACPI_PARSE_OBJECT *OutOp;
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WalkState->Op = Op;
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WalkState->Opcode = Op->Common.AmlOpcode;
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WalkState->OpInfo = AcpiPsGetOpcodeInfo (Op->Common.AmlOpcode);
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/* Copy child pointer to Arg for compatibility with Interpreter */
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if (Op->Asl.Child)
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{
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Op->Common.Value.Arg = Op->Asl.Child;
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}
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/* Call AML dispatcher */
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Status = AcpiDsExecBeginOp (WalkState, &OutOp);
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if (ACPI_FAILURE (Status))
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{
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AcpiOsPrintf ("Constant interpretation failed - %s\n",
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AcpiFormatException (Status));
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}
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return (Status);
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}
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/*******************************************************************************
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*
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* FUNCTION: OpcAmlEvaluationWalk2
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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 AML execution of constant subtrees
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*
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******************************************************************************/
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static ACPI_STATUS
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OpcAmlEvaluationWalk2 (
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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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ACPI_WALK_STATE *WalkState = Context;
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ACPI_STATUS Status;
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WalkState->Op = Op;
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WalkState->Opcode = Op->Common.AmlOpcode;
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WalkState->OpInfo = AcpiPsGetOpcodeInfo (Op->Common.AmlOpcode);
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/* Copy child pointer to Arg for compatibility with Interpreter */
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if (Op->Asl.Child)
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{
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Op->Common.Value.Arg = Op->Asl.Child;
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}
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/* Call AML dispatcher */
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Status = AcpiDsExecEndOp (WalkState);
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if (ACPI_FAILURE (Status))
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{
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AcpiOsPrintf ("Constant interpretation failed - %s\n",
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AcpiFormatException (Status));
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}
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return (Status);
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}
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/*******************************************************************************
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*
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* FUNCTION: OpcAmlCheckForConstant
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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: Check one Op for a type 3/4/5 AML opcode
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*
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******************************************************************************/
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static ACPI_STATUS
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OpcAmlCheckForConstant (
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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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ACPI_WALK_STATE *WalkState = Context;
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WalkState->Op = Op;
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WalkState->Opcode = Op->Common.AmlOpcode;
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WalkState->OpInfo = AcpiPsGetOpcodeInfo (Op->Common.AmlOpcode);
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DbgPrint (ASL_PARSE_OUTPUT, "[%.4d] Opcode: %12.12s ",
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Op->Asl.LogicalLineNumber, Op->Asl.ParseOpName);
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if (!(WalkState->OpInfo->Flags & AML_CONSTANT))
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{
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/* The opcode is not a Type 3/4/5 opcode */
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if (Op->Asl.CompileFlags & NODE_IS_TARGET)
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{
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DbgPrint (ASL_PARSE_OUTPUT,
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"**** Valid Target, cannot reduce ****\n");
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}
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else
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{
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DbgPrint (ASL_PARSE_OUTPUT,
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"**** Not a Type 3/4/5 opcode ****\n");
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}
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if (WalkState->WalkType == ACPI_WALK_CONST_OPTIONAL)
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{
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/*
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* We are looking at at normal expression to see if it can be
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* reduced. It can't. No error
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*/
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return (AE_TYPE);
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}
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/*
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* This is an expression that MUST reduce to a constant, and it
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* can't be reduced. This is an error
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*/
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if (Op->Asl.CompileFlags & NODE_IS_TARGET)
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{
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AslError (ASL_ERROR, ASL_MSG_INVALID_TARGET, Op,
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Op->Asl.ParseOpName);
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}
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else
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{
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AslError (ASL_ERROR, ASL_MSG_INVALID_CONSTANT_OP, Op,
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Op->Asl.ParseOpName);
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}
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return (AE_TYPE);
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}
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/* Debug output */
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DbgPrint (ASL_PARSE_OUTPUT, "TYPE_345");
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if (Op->Asl.CompileFlags & NODE_IS_TARGET)
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{
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DbgPrint (ASL_PARSE_OUTPUT, " TARGET");
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}
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if (Op->Asl.CompileFlags & NODE_IS_TERM_ARG)
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{
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DbgPrint (ASL_PARSE_OUTPUT, " TERMARG");
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}
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DbgPrint (ASL_PARSE_OUTPUT, "\n");
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return (AE_OK);
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}
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/*******************************************************************************
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*
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* FUNCTION: OpcAmlConstantWalk
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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: Reduce an Op and its subtree to a constant if possible
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*
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******************************************************************************/
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ACPI_STATUS
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OpcAmlConstantWalk (
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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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ACPI_WALK_STATE *WalkState;
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ACPI_STATUS Status = AE_OK;
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ACPI_OPERAND_OBJECT *ObjDesc;
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ACPI_PARSE_OBJECT *RootOp;
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ACPI_PARSE_OBJECT *OriginalParentOp;
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UINT8 WalkType;
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/*
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* Only interested in subtrees that could possibly contain
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* expressions that can be evaluated at this time
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*/
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if ((!(Op->Asl.CompileFlags & NODE_COMPILE_TIME_CONST)) ||
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(Op->Asl.CompileFlags & NODE_IS_TARGET))
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{
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return (AE_OK);
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}
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/* Set the walk type based on the reduction used for this op */
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if (Op->Asl.CompileFlags & NODE_IS_TERM_ARG)
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{
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/* Op is a TermArg, constant folding is merely optional */
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if (!Gbl_FoldConstants)
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{
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return (AE_CTRL_DEPTH);
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}
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WalkType = ACPI_WALK_CONST_OPTIONAL;
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}
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else
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{
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/* Op is a DataObject, the expression MUST reduced to a constant */
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WalkType = ACPI_WALK_CONST_REQUIRED;
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}
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/* Create a new walk state */
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WalkState = AcpiDsCreateWalkState (0, NULL, NULL, NULL);
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if (!WalkState)
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{
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return AE_NO_MEMORY;
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}
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WalkState->NextOp = NULL;
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WalkState->Params = NULL;
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WalkState->CallerReturnDesc = &ObjDesc;
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WalkState->WalkType = WalkType;
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/*
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* Examine the entire subtree -- all nodes must be constants
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* or type 3/4/5 opcodes
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*/
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Status = TrWalkParseTree (Op, ASL_WALK_VISIT_DOWNWARD,
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OpcAmlCheckForConstant, NULL, WalkState);
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/*
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* Did we find an entire subtree that contains all constants and type 3/4/5
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* opcodes? (Only AE_OK or AE_TYPE returned from above)
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*/
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if (Status == AE_TYPE)
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{
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/* Subtree cannot be reduced to a constant */
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if (WalkState->WalkType == ACPI_WALK_CONST_OPTIONAL)
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{
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AcpiDsDeleteWalkState (WalkState);
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return (AE_OK);
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}
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/* Don't descend any further, and use a default "constant" value */
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Status = AE_CTRL_DEPTH;
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}
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else
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{
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/* Subtree can be reduced */
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/* Allocate a new temporary root for this subtree */
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RootOp = TrAllocateNode (PARSEOP_INTEGER);
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if (!RootOp)
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{
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return (AE_NO_MEMORY);
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}
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RootOp->Common.AmlOpcode = AML_INT_EVAL_SUBTREE_OP;
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OriginalParentOp = Op->Common.Parent;
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Op->Common.Parent = RootOp;
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/* Hand off the subtree to the AML interpreter */
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Status = TrWalkParseTree (Op, ASL_WALK_VISIT_TWICE,
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OpcAmlEvaluationWalk1, OpcAmlEvaluationWalk2, WalkState);
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Op->Common.Parent = OriginalParentOp;
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/* TBD: we really *should* release the RootOp node */
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if (ACPI_SUCCESS (Status))
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{
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TotalFolds++;
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/* Get the final result */
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Status = AcpiDsResultPop (&ObjDesc, WalkState);
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}
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}
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if (ACPI_FAILURE (Status))
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{
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/* We could not resolve the subtree for some reason */
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AslCoreSubsystemError (Op, Status,
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"Failure during constant evaluation", FALSE);
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AslError (ASL_ERROR, ASL_MSG_CONSTANT_EVALUATION, Op,
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Op->Asl.ParseOpName);
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/* Set the subtree value to ZERO anyway. Eliminates further errors */
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Op->Asl.ParseOpcode = PARSEOP_INTEGER;
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Op->Common.Value.Integer = 0;
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OpcSetOptimalIntegerSize (Op);
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}
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else
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{
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AslError (ASL_OPTIMIZATION, ASL_MSG_CONSTANT_FOLDED, Op,
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Op->Asl.ParseOpName);
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/*
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* Because we know we executed type 3/4/5 opcodes above, we know that
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* the result must be either an Integer, String, or Buffer.
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*/
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switch (ObjDesc->Common.Type)
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{
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case ACPI_TYPE_INTEGER:
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Op->Asl.ParseOpcode = PARSEOP_INTEGER;
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Op->Common.Value.Integer = ObjDesc->Integer.Value;
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OpcSetOptimalIntegerSize (Op);
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DbgPrint (ASL_PARSE_OUTPUT,
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"Constant expression reduced to (INTEGER) %8.8X%8.8X\n",
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ACPI_FORMAT_UINT64 (ObjDesc->Integer.Value));
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break;
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case ACPI_TYPE_STRING:
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Op->Asl.ParseOpcode = PARSEOP_STRING_LITERAL;
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Op->Common.AmlOpcode = AML_STRING_OP;
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Op->Asl.AmlLength = ACPI_STRLEN (ObjDesc->String.Pointer) + 1;
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Op->Common.Value.String = ObjDesc->String.Pointer;
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DbgPrint (ASL_PARSE_OUTPUT,
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"Constant expression reduced to (STRING) %s\n",
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Op->Common.Value.String);
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break;
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case ACPI_TYPE_BUFFER:
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Op->Asl.ParseOpcode = PARSEOP_BUFFER;
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Op->Common.AmlOpcode = AML_BUFFER_OP;
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Op->Asl.CompileFlags = NODE_AML_PACKAGE;
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UtSetParseOpName (Op);
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/* Child node is the buffer length */
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RootOp = TrAllocateNode (PARSEOP_INTEGER);
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RootOp->Asl.AmlOpcode = AML_DWORD_OP;
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RootOp->Asl.Value.Integer = ObjDesc->Buffer.Length;
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RootOp->Asl.Parent = Op;
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(void) OpcSetOptimalIntegerSize (RootOp);
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Op->Asl.Child = RootOp;
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Op = RootOp;
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UtSetParseOpName (Op);
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/* Peer to the child is the raw buffer data */
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RootOp = TrAllocateNode (PARSEOP_RAW_DATA);
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RootOp->Asl.AmlOpcode = AML_RAW_DATA_BUFFER;
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RootOp->Asl.AmlLength = ObjDesc->Buffer.Length;
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RootOp->Asl.Value.String = (char *) ObjDesc->Buffer.Pointer;
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RootOp->Asl.Parent = Op->Asl.Parent;
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Op->Asl.Next = RootOp;
|
|
Op = RootOp;
|
|
|
|
DbgPrint (ASL_PARSE_OUTPUT,
|
|
"Constant expression reduced to (BUFFER) length %X\n",
|
|
ObjDesc->Buffer.Length);
|
|
break;
|
|
|
|
|
|
default:
|
|
printf ("Unsupported return type: %s\n",
|
|
AcpiUtGetObjectTypeName (ObjDesc));
|
|
break;
|
|
}
|
|
}
|
|
|
|
UtSetParseOpName (Op);
|
|
Op->Asl.Child = NULL;
|
|
|
|
AcpiDsDeleteWalkState (WalkState);
|
|
|
|
return (AE_CTRL_DEPTH);
|
|
}
|
|
|