492 lines
14 KiB
C
492 lines
14 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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* Copyright (C) 2000 - 2011, Intel Corp.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions, and the following disclaimer,
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* without modification.
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* 2. Redistributions in binary form must reproduce at minimum a disclaimer
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* substantially similar to the "NO WARRANTY" disclaimer below
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* ("Disclaimer") and any redistribution must be conditioned upon
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* including a substantially similar Disclaimer requirement for further
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* binary redistribution.
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* 3. Neither the names of the above-listed copyright holders nor the names
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* of any contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* Alternatively, this software may be distributed under the terms of the
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* GNU General Public License ("GPL") version 2 as published by the Free
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* Software Foundation.
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*
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* NO WARRANTY
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGES.
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*/
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#include "aslcompiler.h"
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#include "aslcompiler.y.h"
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#include "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;
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Op = RootOp;
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DbgPrint (ASL_PARSE_OUTPUT,
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"Constant expression reduced to (BUFFER) length %X\n",
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ObjDesc->Buffer.Length);
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break;
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default:
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printf ("Unsupported return type: %s\n",
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AcpiUtGetObjectTypeName (ObjDesc));
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break;
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}
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}
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UtSetParseOpName (Op);
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Op->Asl.Child = NULL;
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AcpiDsDeleteWalkState (WalkState);
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return (AE_CTRL_DEPTH);
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}
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