static void
TrInstallReducedConstant (
ACPI_PARSE_OBJECT *Op,
ACPI_OPERAND_OBJECT *ObjDesc)
{
ACPI_PARSE_OBJECT *LengthOp;
ACPI_PARSE_OBJECT *DataOp;
TotalFolds++;
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:
OpcUpdateIntegerNode (Op, ObjDesc->Integer.Value);
DbgPrint (ASL_PARSE_OUTPUT,
"Constant expression reduced to (%s) %8.8X%8.8X\n\n",
Op->Asl.ParseOpName,
ACPI_FORMAT_UINT64 (Op->Common.Value.Integer));
break;
case ACPI_TYPE_STRING:
Op->Asl.ParseOpcode = PARSEOP_STRING_LITERAL;
Op->Common.AmlOpcode = AML_STRING_OP;
Op->Asl.AmlLength = strlen (ObjDesc->String.Pointer) + 1;
Op->Common.Value.String = ObjDesc->String.Pointer;
DbgPrint (ASL_PARSE_OUTPUT,
"Constant expression reduced to (STRING) %s\n\n",
Op->Common.Value.String);
break;
case ACPI_TYPE_BUFFER:
/*
* Create a new parse subtree of the form:
*
* BUFFER (Buffer AML opcode)
* INTEGER (Buffer length in bytes)
* RAW_DATA (Buffer byte data)
*/
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 */
LengthOp = TrAllocateNode (PARSEOP_INTEGER);
LengthOp->Asl.AmlOpcode = AML_DWORD_OP;
LengthOp->Asl.Value.Integer = ObjDesc->Buffer.Length;
LengthOp->Asl.Parent = Op;
(void) OpcSetOptimalIntegerSize (LengthOp);
Op->Asl.Child = LengthOp;
/* Next child is the raw buffer data */
DataOp = TrAllocateNode (PARSEOP_RAW_DATA);
DataOp->Asl.AmlOpcode = AML_RAW_DATA_BUFFER;
DataOp->Asl.AmlLength = ObjDesc->Buffer.Length;
DataOp->Asl.Value.String = (char *) ObjDesc->Buffer.Pointer;
DataOp->Asl.Parent = Op;
LengthOp->Asl.Next = DataOp;
DbgPrint (ASL_PARSE_OUTPUT,
"Constant expression reduced to (BUFFER) length %X\n\n",
ObjDesc->Buffer.Length);
break;
default:
break;
}
}
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->WalkType = WalkType;
WalkState->CallerReturnDesc = &ObjDesc;
/*
* 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);
}
/* Check for error from the ACPICA core */
if (ACPI_FAILURE (Status))
{
AslCoreSubsystemError (Op, Status,
"Failure during constant evaluation", FALSE);
}
}
if (ACPI_FAILURE (Status))
{
/* We could not resolve the subtree for some reason */
AslError (ASL_ERROR, ASL_MSG_CONSTANT_EVALUATION, Op,
Op->Asl.ParseOpName);
/* Set the subtree value to ZERO anyway. Eliminates further errors */
OpcUpdateIntegerNode (Op, 0);
}
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:
OpcUpdateIntegerNode (Op, ObjDesc->Integer.Value);
DbgPrint (ASL_PARSE_OUTPUT,
"Constant expression reduced to (%s) %8.8X%8.8X\n",
Op->Asl.ParseOpName,
ACPI_FORMAT_UINT64 (Op->Common.Value.Integer));
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);
}
ACPI_STATUS
OpcAmlConstantWalk (
ACPI_PARSE_OBJECT *Op,
UINT32 Level,
void *Context)
{
ACPI_WALK_STATE *WalkState;
ACPI_STATUS Status = AE_OK;
if (Op->Asl.CompileFlags == 0)
{
return (AE_OK);
}
/*
* 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);
}
/* Create a new walk state */
WalkState = AcpiDsCreateWalkState (0, NULL, NULL, NULL);
if (!WalkState)
{
return (AE_NO_MEMORY);
}
WalkState->NextOp = NULL;
WalkState->Params = NULL;
/*
* 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?
*/
switch (Status)
{
case AE_OK:
/* Simple case, like Add(3,4) -> 7 */
Status = TrSimpleConstantReduction (Op, WalkState);
break;
case AE_CTRL_RETURN_VALUE:
/* More complex case, like Add(3,4,Local0) -> Store(7,Local0) */
Status = TrTransformToStoreOp (Op, WalkState);
break;
case AE_TYPE:
AcpiDsDeleteWalkState (WalkState);
return (AE_OK);
default:
AcpiDsDeleteWalkState (WalkState);
break;
}
if (ACPI_FAILURE (Status))
{
DbgPrint (ASL_PARSE_OUTPUT, "Cannot resolve, %s\n",
AcpiFormatException (Status));
/* We could not resolve the subtree for some reason */
AslError (ASL_ERROR, ASL_MSG_CONSTANT_EVALUATION, Op,
(char *) AcpiFormatException (Status));
/* Set the subtree value to ZERO anyway. Eliminates further errors */
OpcUpdateIntegerNode (Op, 0);
}
return (AE_OK);
}
