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/******************************************************************************
*
* Module Name: aslfold - Constant folding
*
*****************************************************************************/
/*
* Copyright (C) 2000 - 2011, Intel Corp.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions, and the following disclaimer,
* without modification.
* 2. Redistributions in binary form must reproduce at minimum a disclaimer
* substantially similar to the "NO WARRANTY" disclaimer below
* ("Disclaimer") and any redistribution must be conditioned upon
* including a substantially similar Disclaimer requirement for further
* binary redistribution.
* 3. Neither the names of the above-listed copyright holders nor the names
* of any contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* Alternatively, this software may be distributed under the terms of the
* GNU General Public License ("GPL") version 2 as published by the Free
* Software Foundation.
*
* NO WARRANTY
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGES.
*/
#include <contrib/dev/acpica/compiler/aslcompiler.h>
#include "aslcompiler.y.h"
#include <contrib/dev/acpica/include/amlcode.h>
#include <contrib/dev/acpica/include/acdispat.h>
#include <contrib/dev/acpica/include/acparser.h>
#define _COMPONENT ACPI_COMPILER
ACPI_MODULE_NAME ("aslfold")
/* Local prototypes */
static ACPI_STATUS
OpcAmlEvaluationWalk1 (
ACPI_PARSE_OBJECT *Op,
UINT32 Level,
void *Context);
static ACPI_STATUS
OpcAmlEvaluationWalk2 (
ACPI_PARSE_OBJECT *Op,
UINT32 Level,
void *Context);
static ACPI_STATUS
OpcAmlCheckForConstant (
ACPI_PARSE_OBJECT *Op,
UINT32 Level,
void *Context);
/*******************************************************************************
*
* FUNCTION: OpcAmlEvaluationWalk1
*
* PARAMETERS: ASL_WALK_CALLBACK
*
* RETURN: Status
*
* DESCRIPTION: Descending callback for AML execution of constant subtrees
*
******************************************************************************/
static ACPI_STATUS
OpcAmlEvaluationWalk1 (
ACPI_PARSE_OBJECT *Op,
UINT32 Level,
void *Context)
{
ACPI_WALK_STATE *WalkState = Context;
ACPI_STATUS Status;
ACPI_PARSE_OBJECT *OutOp;
WalkState->Op = Op;
WalkState->Opcode = Op->Common.AmlOpcode;
WalkState->OpInfo = AcpiPsGetOpcodeInfo (Op->Common.AmlOpcode);
/* Copy child pointer to Arg for compatibility with Interpreter */
if (Op->Asl.Child)
{
Op->Common.Value.Arg = Op->Asl.Child;
}
/* Call AML dispatcher */
Status = AcpiDsExecBeginOp (WalkState, &OutOp);
if (ACPI_FAILURE (Status))
{
AcpiOsPrintf ("Constant interpretation failed - %s\n",
AcpiFormatException (Status));
}
return (Status);
}
/*******************************************************************************
*
* FUNCTION: OpcAmlEvaluationWalk2
*
* PARAMETERS: ASL_WALK_CALLBACK
*
* RETURN: Status
*
* DESCRIPTION: Ascending callback for AML execution of constant subtrees
*
******************************************************************************/
static ACPI_STATUS
OpcAmlEvaluationWalk2 (
ACPI_PARSE_OBJECT *Op,
UINT32 Level,
void *Context)
{
ACPI_WALK_STATE *WalkState = Context;
ACPI_STATUS Status;
WalkState->Op = Op;
WalkState->Opcode = Op->Common.AmlOpcode;
WalkState->OpInfo = AcpiPsGetOpcodeInfo (Op->Common.AmlOpcode);
/* Copy child pointer to Arg for compatibility with Interpreter */
if (Op->Asl.Child)
{
Op->Common.Value.Arg = Op->Asl.Child;
}
/* Call AML dispatcher */
Status = AcpiDsExecEndOp (WalkState);
if (ACPI_FAILURE (Status))
{
AcpiOsPrintf ("Constant interpretation failed - %s\n",
AcpiFormatException (Status));
}
return (Status);
}
/*******************************************************************************
*
* FUNCTION: OpcAmlCheckForConstant
*
* PARAMETERS: ASL_WALK_CALLBACK
*
* RETURN: Status
*
* DESCRIPTION: Check one Op for a type 3/4/5 AML opcode
*
******************************************************************************/
static ACPI_STATUS
OpcAmlCheckForConstant (
ACPI_PARSE_OBJECT *Op,
UINT32 Level,
void *Context)
{
ACPI_WALK_STATE *WalkState = Context;
WalkState->Op = Op;
WalkState->Opcode = Op->Common.AmlOpcode;
WalkState->OpInfo = AcpiPsGetOpcodeInfo (Op->Common.AmlOpcode);
DbgPrint (ASL_PARSE_OUTPUT, "[%.4d] Opcode: %12.12s ",
Op->Asl.LogicalLineNumber, Op->Asl.ParseOpName);
if (!(WalkState->OpInfo->Flags & AML_CONSTANT))
{
/* The opcode is not a Type 3/4/5 opcode */
if (Op->Asl.CompileFlags & NODE_IS_TARGET)
{
DbgPrint (ASL_PARSE_OUTPUT,
"**** Valid Target, cannot reduce ****\n");
}
else
{
DbgPrint (ASL_PARSE_OUTPUT,
"**** Not a Type 3/4/5 opcode ****\n");
}
if (WalkState->WalkType == ACPI_WALK_CONST_OPTIONAL)
{
/*
* We are looking at at normal expression to see if it can be
* reduced. It can't. No error
*/
return (AE_TYPE);
}
/*
* This is an expression that MUST reduce to a constant, and it
* can't be reduced. This is an error
*/
if (Op->Asl.CompileFlags & NODE_IS_TARGET)
{
AslError (ASL_ERROR, ASL_MSG_INVALID_TARGET, Op,
Op->Asl.ParseOpName);
}
else
{
AslError (ASL_ERROR, ASL_MSG_INVALID_CONSTANT_OP, Op,
Op->Asl.ParseOpName);
}
return (AE_TYPE);
}
/* Debug output */
DbgPrint (ASL_PARSE_OUTPUT, "TYPE_345");
if (Op->Asl.CompileFlags & NODE_IS_TARGET)
{
DbgPrint (ASL_PARSE_OUTPUT, " TARGET");
}
if (Op->Asl.CompileFlags & NODE_IS_TERM_ARG)
{
DbgPrint (ASL_PARSE_OUTPUT, " TERMARG");
}
DbgPrint (ASL_PARSE_OUTPUT, "\n");
return (AE_OK);
}
/*******************************************************************************
*
* FUNCTION: OpcAmlConstantWalk
*
* PARAMETERS: ASL_WALK_CALLBACK
*
* RETURN: Status
*
* DESCRIPTION: Reduce an Op and its subtree to a constant if possible
*
******************************************************************************/
ACPI_STATUS
OpcAmlConstantWalk (
ACPI_PARSE_OBJECT *Op,
UINT32 Level,
void *Context)
{
ACPI_WALK_STATE *WalkState;
ACPI_STATUS Status = AE_OK;
ACPI_OPERAND_OBJECT *ObjDesc;
ACPI_PARSE_OBJECT *RootOp;
ACPI_PARSE_OBJECT *OriginalParentOp;
UINT8 WalkType;
/*
* Only interested in subtrees that could possibly contain
* expressions that can be evaluated at this time
*/
if ((!(Op->Asl.CompileFlags & NODE_COMPILE_TIME_CONST)) ||
(Op->Asl.CompileFlags & NODE_IS_TARGET))
{
return (AE_OK);
}
/* Set the walk type based on the reduction used for this op */
if (Op->Asl.CompileFlags & NODE_IS_TERM_ARG)
{
/* Op is a TermArg, constant folding is merely optional */
if (!Gbl_FoldConstants)
{
return (AE_CTRL_DEPTH);
}
WalkType = ACPI_WALK_CONST_OPTIONAL;
}
else
{
/* Op is a DataObject, the expression MUST reduced to a constant */
WalkType = ACPI_WALK_CONST_REQUIRED;
}
/* Create a new walk state */
WalkState = AcpiDsCreateWalkState (0, NULL, NULL, NULL);
if (!WalkState)
{
return AE_NO_MEMORY;
}
WalkState->NextOp = NULL;
WalkState->Params = NULL;
WalkState->CallerReturnDesc = &ObjDesc;
WalkState->WalkType = WalkType;
/*
* Examine the entire subtree -- all nodes must be constants
* or type 3/4/5 opcodes
*/
Status = TrWalkParseTree (Op, ASL_WALK_VISIT_DOWNWARD,
OpcAmlCheckForConstant, NULL, WalkState);
/*
* Did we find an entire subtree that contains all constants and type 3/4/5
* opcodes? (Only AE_OK or AE_TYPE returned from above)
*/
if (Status == AE_TYPE)
{
/* Subtree cannot be reduced to a constant */
if (WalkState->WalkType == ACPI_WALK_CONST_OPTIONAL)
{
AcpiDsDeleteWalkState (WalkState);
return (AE_OK);
}
/* Don't descend any further, and use a default "constant" value */
Status = AE_CTRL_DEPTH;
}
else
{
/* Subtree can be reduced */
/* Allocate a new temporary root for this subtree */
RootOp = TrAllocateNode (PARSEOP_INTEGER);
if (!RootOp)
{
return (AE_NO_MEMORY);
}
RootOp->Common.AmlOpcode = AML_INT_EVAL_SUBTREE_OP;
OriginalParentOp = Op->Common.Parent;
Op->Common.Parent = RootOp;
/* Hand off the subtree to the AML interpreter */
Status = TrWalkParseTree (Op, ASL_WALK_VISIT_TWICE,
OpcAmlEvaluationWalk1, OpcAmlEvaluationWalk2, WalkState);
Op->Common.Parent = OriginalParentOp;
/* TBD: we really *should* release the RootOp node */
if (ACPI_SUCCESS (Status))
{
TotalFolds++;
/* Get the final result */
Status = AcpiDsResultPop (&ObjDesc, WalkState);
}
}
if (ACPI_FAILURE (Status))
{
/* We could not resolve the subtree for some reason */
AslCoreSubsystemError (Op, Status,
"Failure during constant evaluation", FALSE);
AslError (ASL_ERROR, ASL_MSG_CONSTANT_EVALUATION, Op,
Op->Asl.ParseOpName);
/* Set the subtree value to ZERO anyway. Eliminates further errors */
Op->Asl.ParseOpcode = PARSEOP_INTEGER;
Op->Common.Value.Integer = 0;
OpcSetOptimalIntegerSize (Op);
}
else
{
AslError (ASL_OPTIMIZATION, ASL_MSG_CONSTANT_FOLDED, Op,
Op->Asl.ParseOpName);
/*
* Because we know we executed type 3/4/5 opcodes above, we know that
* the result must be either an Integer, String, or Buffer.
*/
switch (ObjDesc->Common.Type)
{
case ACPI_TYPE_INTEGER:
Op->Asl.ParseOpcode = PARSEOP_INTEGER;
Op->Common.Value.Integer = ObjDesc->Integer.Value;
OpcSetOptimalIntegerSize (Op);
DbgPrint (ASL_PARSE_OUTPUT,
"Constant expression reduced to (INTEGER) %8.8X%8.8X\n",
ACPI_FORMAT_UINT64 (ObjDesc->Integer.Value));
break;
case ACPI_TYPE_STRING:
Op->Asl.ParseOpcode = PARSEOP_STRING_LITERAL;
Op->Common.AmlOpcode = AML_STRING_OP;
Op->Asl.AmlLength = ACPI_STRLEN (ObjDesc->String.Pointer) + 1;
Op->Common.Value.String = ObjDesc->String.Pointer;
DbgPrint (ASL_PARSE_OUTPUT,
"Constant expression reduced to (STRING) %s\n",
Op->Common.Value.String);
break;
case ACPI_TYPE_BUFFER:
Op->Asl.ParseOpcode = PARSEOP_BUFFER;
Op->Common.AmlOpcode = AML_BUFFER_OP;
Op->Asl.CompileFlags = NODE_AML_PACKAGE;
UtSetParseOpName (Op);
/* Child node is the buffer length */
RootOp = TrAllocateNode (PARSEOP_INTEGER);
RootOp->Asl.AmlOpcode = AML_DWORD_OP;
RootOp->Asl.Value.Integer = ObjDesc->Buffer.Length;
RootOp->Asl.Parent = Op;
(void) OpcSetOptimalIntegerSize (RootOp);
Op->Asl.Child = RootOp;
Op = RootOp;
UtSetParseOpName (Op);
/* Peer to the child is the raw buffer data */
RootOp = TrAllocateNode (PARSEOP_RAW_DATA);
RootOp->Asl.AmlOpcode = AML_RAW_DATA_BUFFER;
RootOp->Asl.AmlLength = ObjDesc->Buffer.Length;
RootOp->Asl.Value.String = (char *) ObjDesc->Buffer.Pointer;
RootOp->Asl.Parent = Op->Asl.Parent;
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);
}