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| Current File : //usr/src/sys/contrib/dev/acpica/compiler/asltree.c |
/******************************************************************************
*
* Module Name: asltree - parse tree management
*
*****************************************************************************/
/*
* 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 <time.h>
#define _COMPONENT ACPI_COMPILER
ACPI_MODULE_NAME ("asltree")
/* Local prototypes */
static ACPI_PARSE_OBJECT *
TrGetNextNode (
void);
static char *
TrGetNodeFlagName (
UINT32 Flags);
/*******************************************************************************
*
* FUNCTION: TrGetNextNode
*
* PARAMETERS: None
*
* RETURN: New parse node. Aborts on allocation failure
*
* DESCRIPTION: Allocate a new parse node for the parse tree. Bypass the local
* dynamic memory manager for performance reasons (This has a
* major impact on the speed of the compiler.)
*
******************************************************************************/
static ACPI_PARSE_OBJECT *
TrGetNextNode (
void)
{
if (Gbl_NodeCacheNext >= Gbl_NodeCacheLast)
{
Gbl_NodeCacheNext = UtLocalCalloc (sizeof (ACPI_PARSE_OBJECT) *
ASL_NODE_CACHE_SIZE);
Gbl_NodeCacheLast = Gbl_NodeCacheNext + ASL_NODE_CACHE_SIZE;
}
return (Gbl_NodeCacheNext++);
}
/*******************************************************************************
*
* FUNCTION: TrAllocateNode
*
* PARAMETERS: ParseOpcode - Opcode to be assigned to the node
*
* RETURN: New parse node. Aborts on allocation failure
*
* DESCRIPTION: Allocate and initialize a new parse node for the parse tree
*
******************************************************************************/
ACPI_PARSE_OBJECT *
TrAllocateNode (
UINT32 ParseOpcode)
{
ACPI_PARSE_OBJECT *Op;
Op = TrGetNextNode ();
Op->Asl.ParseOpcode = (UINT16) ParseOpcode;
Op->Asl.Filename = Gbl_Files[ASL_FILE_INPUT].Filename;
Op->Asl.LineNumber = Gbl_CurrentLineNumber;
Op->Asl.LogicalLineNumber = Gbl_LogicalLineNumber;
Op->Asl.LogicalByteOffset = Gbl_CurrentLineOffset;
Op->Asl.Column = Gbl_CurrentColumn;
UtSetParseOpName (Op);
return Op;
}
/*******************************************************************************
*
* FUNCTION: TrReleaseNode
*
* PARAMETERS: Op - Op to be released
*
* RETURN: None
*
* DESCRIPTION: "release" a node. In truth, nothing is done since the node
* is part of a larger buffer
*
******************************************************************************/
void
TrReleaseNode (
ACPI_PARSE_OBJECT *Op)
{
return;
}
/*******************************************************************************
*
* FUNCTION: TrUpdateNode
*
* PARAMETERS: ParseOpcode - New opcode to be assigned to the node
* Op - An existing parse node
*
* RETURN: The updated node
*
* DESCRIPTION: Change the parse opcode assigned to a node. Usually used to
* change an opcode to DEFAULT_ARG so that the node is ignored
* during the code generation. Also used to set generic integers
* to a specific size (8, 16, 32, or 64 bits)
*
******************************************************************************/
ACPI_PARSE_OBJECT *
TrUpdateNode (
UINT32 ParseOpcode,
ACPI_PARSE_OBJECT *Op)
{
if (!Op)
{
return NULL;
}
DbgPrint (ASL_PARSE_OUTPUT,
"\nUpdateNode: Old - %s, New - %s\n\n",
UtGetOpName (Op->Asl.ParseOpcode),
UtGetOpName (ParseOpcode));
/* Assign new opcode and name */
if (Op->Asl.ParseOpcode == PARSEOP_ONES)
{
switch (ParseOpcode)
{
case PARSEOP_BYTECONST:
Op->Asl.Value.Integer = 0xFF;
break;
case PARSEOP_WORDCONST:
Op->Asl.Value.Integer = 0xFFFF;
break;
case PARSEOP_DWORDCONST:
Op->Asl.Value.Integer = 0xFFFFFFFF;
break;
default:
/* Don't care about others, don't need to check QWORD */
break;
}
}
Op->Asl.ParseOpcode = (UINT16) ParseOpcode;
UtSetParseOpName (Op);
/*
* For the BYTE, WORD, and DWORD constants, make sure that the integer
* that was passed in will actually fit into the data type
*/
switch (ParseOpcode)
{
case PARSEOP_BYTECONST:
Op = UtCheckIntegerRange (Op, 0x00, ACPI_UINT8_MAX);
break;
case PARSEOP_WORDCONST:
Op = UtCheckIntegerRange (Op, 0x00, ACPI_UINT16_MAX);
break;
case PARSEOP_DWORDCONST:
Op = UtCheckIntegerRange (Op, 0x00, ACPI_UINT32_MAX);
break;
default:
/* Don't care about others, don't need to check QWORD */
break;
}
return Op;
}
/*******************************************************************************
*
* FUNCTION: TrGetNodeFlagName
*
* PARAMETERS: Flags - Flags word to be decoded
*
* RETURN: Name string. Always returns a valid string pointer.
*
* DESCRIPTION: Decode a flags word
*
******************************************************************************/
static char *
TrGetNodeFlagName (
UINT32 Flags)
{
switch (Flags)
{
case NODE_VISITED:
return ("NODE_VISITED");
case NODE_AML_PACKAGE:
return ("NODE_AML_PACKAGE");
case NODE_IS_TARGET:
return ("NODE_IS_TARGET");
case NODE_IS_RESOURCE_DESC:
return ("NODE_IS_RESOURCE_DESC");
case NODE_IS_RESOURCE_FIELD:
return ("NODE_IS_RESOURCE_FIELD");
case NODE_HAS_NO_EXIT:
return ("NODE_HAS_NO_EXIT");
case NODE_IF_HAS_NO_EXIT:
return ("NODE_IF_HAS_NO_EXIT");
case NODE_NAME_INTERNALIZED:
return ("NODE_NAME_INTERNALIZED");
case NODE_METHOD_NO_RETVAL:
return ("NODE_METHOD_NO_RETVAL");
case NODE_METHOD_SOME_NO_RETVAL:
return ("NODE_METHOD_SOME_NO_RETVAL");
case NODE_RESULT_NOT_USED:
return ("NODE_RESULT_NOT_USED");
case NODE_METHOD_TYPED:
return ("NODE_METHOD_TYPED");
case NODE_IS_BIT_OFFSET:
return ("NODE_IS_BIT_OFFSET");
case NODE_COMPILE_TIME_CONST:
return ("NODE_COMPILE_TIME_CONST");
case NODE_IS_TERM_ARG:
return ("NODE_IS_TERM_ARG");
case NODE_WAS_ONES_OP:
return ("NODE_WAS_ONES_OP");
case NODE_IS_NAME_DECLARATION:
return ("NODE_IS_NAME_DECLARATION");
default:
return ("Multiple Flags (or unknown flag) set");
}
}
/*******************************************************************************
*
* FUNCTION: TrSetNodeFlags
*
* PARAMETERS: Op - An existing parse node
* Flags - New flags word
*
* RETURN: The updated parser op
*
* DESCRIPTION: Set bits in the node flags word. Will not clear bits, only set
*
******************************************************************************/
ACPI_PARSE_OBJECT *
TrSetNodeFlags (
ACPI_PARSE_OBJECT *Op,
UINT32 Flags)
{
DbgPrint (ASL_PARSE_OUTPUT,
"\nSetNodeFlags: Op %p, %8.8X %s\n\n", Op, Flags,
TrGetNodeFlagName (Flags));
if (!Op)
{
return NULL;
}
Op->Asl.CompileFlags |= Flags;
return Op;
}
/*******************************************************************************
*
* FUNCTION: TrSetEndLineNumber
*
* PARAMETERS: Op - An existing parse node
*
* RETURN: None.
*
* DESCRIPTION: Set the ending line numbers (file line and logical line) of a
* parse node to the current line numbers.
*
******************************************************************************/
void
TrSetEndLineNumber (
ACPI_PARSE_OBJECT *Op)
{
/* If the end line # is already set, just return */
if (Op->Asl.EndLine)
{
return;
}
Op->Asl.EndLine = Gbl_CurrentLineNumber;
Op->Asl.EndLogicalLine = Gbl_LogicalLineNumber;
}
/*******************************************************************************
*
* FUNCTION: TrCreateLeafNode
*
* PARAMETERS: ParseOpcode - New opcode to be assigned to the node
*
* RETURN: Pointer to the new node. Aborts on allocation failure
*
* DESCRIPTION: Create a simple leaf node (no children or peers, and no value
* assigned to the node)
*
******************************************************************************/
ACPI_PARSE_OBJECT *
TrCreateLeafNode (
UINT32 ParseOpcode)
{
ACPI_PARSE_OBJECT *Op;
Op = TrAllocateNode (ParseOpcode);
DbgPrint (ASL_PARSE_OUTPUT,
"\nCreateLeafNode Ln/Col %u/%u NewNode %p Op %s\n\n",
Op->Asl.LineNumber, Op->Asl.Column, Op, UtGetOpName(ParseOpcode));
return Op;
}
/*******************************************************************************
*
* FUNCTION: TrCreateConstantLeafNode
*
* PARAMETERS: ParseOpcode - The constant opcode
*
* RETURN: Pointer to the new node. Aborts on allocation failure
*
* DESCRIPTION: Create a leaf node (no children or peers) for one of the
* special constants - __LINE__, __FILE__, and __DATE__.
*
* Note: An implemenation of __FUNC__ cannot happen here because we don't
* have a full parse tree at this time and cannot find the parent control
* method. If it is ever needed, __FUNC__ must be implemented later, after
* the parse tree has been fully constructed.
*
******************************************************************************/
ACPI_PARSE_OBJECT *
TrCreateConstantLeafNode (
UINT32 ParseOpcode)
{
ACPI_PARSE_OBJECT *Op = NULL;
time_t CurrentTime;
char *StaticTimeString;
char *TimeString;
switch (ParseOpcode)
{
case PARSEOP___LINE__:
Op = TrAllocateNode (PARSEOP_INTEGER);
Op->Asl.Value.Integer = Op->Asl.LineNumber;
break;
case PARSEOP___FILE__:
Op = TrAllocateNode (PARSEOP_STRING_LITERAL);
/* Op.Asl.Filename contains the full pathname to the file */
Op->Asl.Value.String = Op->Asl.Filename;
break;
case PARSEOP___DATE__:
Op = TrAllocateNode (PARSEOP_STRING_LITERAL);
/* Get a copy of the current time */
CurrentTime = time (NULL);
StaticTimeString = ctime (&CurrentTime);
TimeString = UtLocalCalloc (strlen (StaticTimeString) + 1);
strcpy (TimeString, StaticTimeString);
TimeString[strlen(TimeString) -1] = 0; /* Remove trailing newline */
Op->Asl.Value.String = TimeString;
break;
default: /* This would be an internal error */
return (NULL);
}
DbgPrint (ASL_PARSE_OUTPUT,
"\nCreateConstantLeafNode Ln/Col %u/%u NewNode %p Op %s Value %8.8X%8.8X ",
Op->Asl.LineNumber, Op->Asl.Column, Op, UtGetOpName (ParseOpcode),
ACPI_FORMAT_UINT64 (Op->Asl.Value.Integer));
return (Op);
}
/*******************************************************************************
*
* FUNCTION: TrCreateValuedLeafNode
*
* PARAMETERS: ParseOpcode - New opcode to be assigned to the node
* Value - Value to be assigned to the node
*
* RETURN: Pointer to the new node. Aborts on allocation failure
*
* DESCRIPTION: Create a leaf node (no children or peers) with a value
* assigned to it
*
******************************************************************************/
ACPI_PARSE_OBJECT *
TrCreateValuedLeafNode (
UINT32 ParseOpcode,
UINT64 Value)
{
ACPI_PARSE_OBJECT *Op;
Op = TrAllocateNode (ParseOpcode);
DbgPrint (ASL_PARSE_OUTPUT,
"\nCreateValuedLeafNode Ln/Col %u/%u NewNode %p Op %s Value %8.8X%8.8X ",
Op->Asl.LineNumber, Op->Asl.Column, Op, UtGetOpName(ParseOpcode),
ACPI_FORMAT_UINT64 (Value));
Op->Asl.Value.Integer = Value;
switch (ParseOpcode)
{
case PARSEOP_STRING_LITERAL:
DbgPrint (ASL_PARSE_OUTPUT, "STRING->%s", Value);
break;
case PARSEOP_NAMESEG:
DbgPrint (ASL_PARSE_OUTPUT, "NAMESEG->%s", Value);
break;
case PARSEOP_NAMESTRING:
DbgPrint (ASL_PARSE_OUTPUT, "NAMESTRING->%s", Value);
break;
case PARSEOP_EISAID:
DbgPrint (ASL_PARSE_OUTPUT, "EISAID->%s", Value);
break;
case PARSEOP_METHOD:
DbgPrint (ASL_PARSE_OUTPUT, "METHOD");
break;
case PARSEOP_INTEGER:
DbgPrint (ASL_PARSE_OUTPUT, "INTEGER");
break;
default:
break;
}
DbgPrint (ASL_PARSE_OUTPUT, "\n\n");
return Op;
}
/*******************************************************************************
*
* FUNCTION: TrCreateNode
*
* PARAMETERS: ParseOpcode - Opcode to be assigned to the node
* NumChildren - Number of children to follow
* ... - A list of child nodes to link to the new
* node. NumChildren long.
*
* RETURN: Pointer to the new node. Aborts on allocation failure
*
* DESCRIPTION: Create a new parse node and link together a list of child
* nodes underneath the new node.
*
******************************************************************************/
ACPI_PARSE_OBJECT *
TrCreateNode (
UINT32 ParseOpcode,
UINT32 NumChildren,
...)
{
ACPI_PARSE_OBJECT *Op;
ACPI_PARSE_OBJECT *Child;
ACPI_PARSE_OBJECT *PrevChild;
va_list ap;
UINT32 i;
BOOLEAN FirstChild;
va_start (ap, NumChildren);
/* Allocate one new node */
Op = TrAllocateNode (ParseOpcode);
DbgPrint (ASL_PARSE_OUTPUT,
"\nCreateNode Ln/Col %u/%u NewParent %p Child %u Op %s ",
Op->Asl.LineNumber, Op->Asl.Column, Op, NumChildren, UtGetOpName(ParseOpcode));
/* Some extra debug output based on the parse opcode */
switch (ParseOpcode)
{
case PARSEOP_DEFINITIONBLOCK:
RootNode = Op;
DbgPrint (ASL_PARSE_OUTPUT, "DEFINITION_BLOCK (Tree Completed)->");
break;
case PARSEOP_OPERATIONREGION:
DbgPrint (ASL_PARSE_OUTPUT, "OPREGION->");
break;
case PARSEOP_OR:
DbgPrint (ASL_PARSE_OUTPUT, "OR->");
break;
default:
/* Nothing to do for other opcodes */
break;
}
/* Link the new node to its children */
PrevChild = NULL;
FirstChild = TRUE;
for (i = 0; i < NumChildren; i++)
{
/* Get the next child */
Child = va_arg (ap, ACPI_PARSE_OBJECT *);
DbgPrint (ASL_PARSE_OUTPUT, "%p, ", Child);
/*
* If child is NULL, this means that an optional argument
* was omitted. We must create a placeholder with a special
* opcode (DEFAULT_ARG) so that the code generator will know
* that it must emit the correct default for this argument
*/
if (!Child)
{
Child = TrAllocateNode (PARSEOP_DEFAULT_ARG);
}
/* Link first child to parent */
if (FirstChild)
{
FirstChild = FALSE;
Op->Asl.Child = Child;
}
/* Point all children to parent */
Child->Asl.Parent = Op;
/* Link children in a peer list */
if (PrevChild)
{
PrevChild->Asl.Next = Child;
};
/*
* This child might be a list, point all nodes in the list
* to the same parent
*/
while (Child->Asl.Next)
{
Child = Child->Asl.Next;
Child->Asl.Parent = Op;
}
PrevChild = Child;
}
va_end(ap);
DbgPrint (ASL_PARSE_OUTPUT, "\n\n");
return Op;
}
/*******************************************************************************
*
* FUNCTION: TrLinkChildren
*
* PARAMETERS: Op - An existing parse node
* NumChildren - Number of children to follow
* ... - A list of child nodes to link to the new
* node. NumChildren long.
*
* RETURN: The updated (linked) node
*
* DESCRIPTION: Link a group of nodes to an existing parse node
*
******************************************************************************/
ACPI_PARSE_OBJECT *
TrLinkChildren (
ACPI_PARSE_OBJECT *Op,
UINT32 NumChildren,
...)
{
ACPI_PARSE_OBJECT *Child;
ACPI_PARSE_OBJECT *PrevChild;
va_list ap;
UINT32 i;
BOOLEAN FirstChild;
va_start (ap, NumChildren);
TrSetEndLineNumber (Op);
DbgPrint (ASL_PARSE_OUTPUT,
"\nLinkChildren Line [%u to %u] NewParent %p Child %u Op %s ",
Op->Asl.LineNumber, Op->Asl.EndLine,
Op, NumChildren, UtGetOpName(Op->Asl.ParseOpcode));
switch (Op->Asl.ParseOpcode)
{
case PARSEOP_DEFINITIONBLOCK:
RootNode = Op;
DbgPrint (ASL_PARSE_OUTPUT, "DEFINITION_BLOCK (Tree Completed)->");
break;
case PARSEOP_OPERATIONREGION:
DbgPrint (ASL_PARSE_OUTPUT, "OPREGION->");
break;
case PARSEOP_OR:
DbgPrint (ASL_PARSE_OUTPUT, "OR->");
break;
default:
/* Nothing to do for other opcodes */
break;
}
/* Link the new node to it's children */
PrevChild = NULL;
FirstChild = TRUE;
for (i = 0; i < NumChildren; i++)
{
Child = va_arg (ap, ACPI_PARSE_OBJECT *);
if ((Child == PrevChild) && (Child != NULL))
{
AslError (ASL_WARNING, ASL_MSG_COMPILER_INTERNAL, Child,
"Child node list invalid");
return Op;
}
DbgPrint (ASL_PARSE_OUTPUT, "%p, ", Child);
/*
* If child is NULL, this means that an optional argument
* was omitted. We must create a placeholder with a special
* opcode (DEFAULT_ARG) so that the code generator will know
* that it must emit the correct default for this argument
*/
if (!Child)
{
Child = TrAllocateNode (PARSEOP_DEFAULT_ARG);
}
/* Link first child to parent */
if (FirstChild)
{
FirstChild = FALSE;
Op->Asl.Child = Child;
}
/* Point all children to parent */
Child->Asl.Parent = Op;
/* Link children in a peer list */
if (PrevChild)
{
PrevChild->Asl.Next = Child;
};
/*
* This child might be a list, point all nodes in the list
* to the same parent
*/
while (Child->Asl.Next)
{
Child = Child->Asl.Next;
Child->Asl.Parent = Op;
}
PrevChild = Child;
}
va_end(ap);
DbgPrint (ASL_PARSE_OUTPUT, "\n\n");
return Op;
}
/*******************************************************************************
*
* FUNCTION: TrLinkPeerNode
*
* PARAMETERS: Op1 - First peer
* Op2 - Second peer
*
* RETURN: Op1 or the non-null node.
*
* DESCRIPTION: Link two nodes as peers. Handles cases where one peer is null.
*
******************************************************************************/
ACPI_PARSE_OBJECT *
TrLinkPeerNode (
ACPI_PARSE_OBJECT *Op1,
ACPI_PARSE_OBJECT *Op2)
{
ACPI_PARSE_OBJECT *Next;
DbgPrint (ASL_PARSE_OUTPUT,
"\nLinkPeerNode: 1=%p (%s), 2=%p (%s)\n\n",
Op1, Op1 ? UtGetOpName(Op1->Asl.ParseOpcode) : NULL,
Op2, Op2 ? UtGetOpName(Op2->Asl.ParseOpcode) : NULL);
if ((!Op1) && (!Op2))
{
DbgPrint (ASL_PARSE_OUTPUT, "\nTwo Null nodes!\n");
return Op1;
}
/* If one of the nodes is null, just return the non-null node */
if (!Op2)
{
return Op1;
}
if (!Op1)
{
return Op2;
}
if (Op1 == Op2)
{
DbgPrint (ASL_DEBUG_OUTPUT,
"\n\n************* Internal error, linking node to itself %p\n\n\n",
Op1);
AslError (ASL_WARNING, ASL_MSG_COMPILER_INTERNAL, Op1,
"Linking node to itself");
return Op1;
}
Op1->Asl.Parent = Op2->Asl.Parent;
/*
* Op 1 may already have a peer list (such as an IF/ELSE pair),
* so we must walk to the end of the list and attach the new
* peer at the end
*/
Next = Op1;
while (Next->Asl.Next)
{
Next = Next->Asl.Next;
}
Next->Asl.Next = Op2;
return Op1;
}
/*******************************************************************************
*
* FUNCTION: TrLinkPeerNodes
*
* PARAMETERS: NumPeers - The number of nodes in the list to follow
* ... - A list of nodes to link together as peers
*
* RETURN: The first node in the list (head of the peer list)
*
* DESCRIPTION: Link together an arbitrary number of peer nodes.
*
******************************************************************************/
ACPI_PARSE_OBJECT *
TrLinkPeerNodes (
UINT32 NumPeers,
...)
{
ACPI_PARSE_OBJECT *This;
ACPI_PARSE_OBJECT *Next;
va_list ap;
UINT32 i;
ACPI_PARSE_OBJECT *Start;
DbgPrint (ASL_PARSE_OUTPUT,
"\nLinkPeerNodes: (%u) ", NumPeers);
va_start (ap, NumPeers);
This = va_arg (ap, ACPI_PARSE_OBJECT *);
Start = This;
/*
* Link all peers
*/
for (i = 0; i < (NumPeers -1); i++)
{
DbgPrint (ASL_PARSE_OUTPUT, "%u=%p ", (i+1), This);
while (This->Asl.Next)
{
This = This->Asl.Next;
}
/* Get another peer node */
Next = va_arg (ap, ACPI_PARSE_OBJECT *);
if (!Next)
{
Next = TrAllocateNode (PARSEOP_DEFAULT_ARG);
}
/* link new node to the current node */
This->Asl.Next = Next;
This = Next;
}
va_end (ap);
DbgPrint (ASL_PARSE_OUTPUT,"\n\n");
return (Start);
}
/*******************************************************************************
*
* FUNCTION: TrLinkChildNode
*
* PARAMETERS: Op1 - Parent node
* Op2 - Op to become a child
*
* RETURN: The parent node
*
* DESCRIPTION: Link two nodes together as a parent and child
*
******************************************************************************/
ACPI_PARSE_OBJECT *
TrLinkChildNode (
ACPI_PARSE_OBJECT *Op1,
ACPI_PARSE_OBJECT *Op2)
{
ACPI_PARSE_OBJECT *Next;
DbgPrint (ASL_PARSE_OUTPUT,
"\nLinkChildNode: Parent=%p (%s), Child=%p (%s)\n\n",
Op1, Op1 ? UtGetOpName(Op1->Asl.ParseOpcode): NULL,
Op2, Op2 ? UtGetOpName(Op2->Asl.ParseOpcode): NULL);
if (!Op1 || !Op2)
{
return Op1;
}
Op1->Asl.Child = Op2;
/* Set the child and all peers of the child to point to the parent */
Next = Op2;
while (Next)
{
Next->Asl.Parent = Op1;
Next = Next->Asl.Next;
}
return Op1;
}
/*******************************************************************************
*
* FUNCTION: TrWalkParseTree
*
* PARAMETERS: Visitation - Type of walk
* DescendingCallback - Called during tree descent
* AscendingCallback - Called during tree ascent
* Context - To be passed to the callbacks
*
* RETURN: Status from callback(s)
*
* DESCRIPTION: Walk the entire parse tree.
*
******************************************************************************/
ACPI_STATUS
TrWalkParseTree (
ACPI_PARSE_OBJECT *Op,
UINT32 Visitation,
ASL_WALK_CALLBACK DescendingCallback,
ASL_WALK_CALLBACK AscendingCallback,
void *Context)
{
UINT32 Level;
BOOLEAN NodePreviouslyVisited;
ACPI_PARSE_OBJECT *StartOp = Op;
ACPI_STATUS Status;
if (!RootNode)
{
return (AE_OK);
}
Level = 0;
NodePreviouslyVisited = FALSE;
switch (Visitation)
{
case ASL_WALK_VISIT_DOWNWARD:
while (Op)
{
if (!NodePreviouslyVisited)
{
/* Let the callback process the node. */
Status = DescendingCallback (Op, Level, Context);
if (ACPI_SUCCESS (Status))
{
/* Visit children first, once */
if (Op->Asl.Child)
{
Level++;
Op = Op->Asl.Child;
continue;
}
}
else if (Status != AE_CTRL_DEPTH)
{
/* Exit immediately on any error */
return (Status);
}
}
/* Terminate walk at start op */
if (Op == StartOp)
{
break;
}
/* No more children, visit peers */
if (Op->Asl.Next)
{
Op = Op->Asl.Next;
NodePreviouslyVisited = FALSE;
}
else
{
/* No children or peers, re-visit parent */
if (Level != 0 )
{
Level--;
}
Op = Op->Asl.Parent;
NodePreviouslyVisited = TRUE;
}
}
break;
case ASL_WALK_VISIT_UPWARD:
while (Op)
{
/* Visit leaf node (no children) or parent node on return trip */
if ((!Op->Asl.Child) ||
(NodePreviouslyVisited))
{
/* Let the callback process the node. */
Status = AscendingCallback (Op, Level, Context);
if (ACPI_FAILURE (Status))
{
return (Status);
}
}
else
{
/* Visit children first, once */
Level++;
Op = Op->Asl.Child;
continue;
}
/* Terminate walk at start op */
if (Op == StartOp)
{
break;
}
/* No more children, visit peers */
if (Op->Asl.Next)
{
Op = Op->Asl.Next;
NodePreviouslyVisited = FALSE;
}
else
{
/* No children or peers, re-visit parent */
if (Level != 0 )
{
Level--;
}
Op = Op->Asl.Parent;
NodePreviouslyVisited = TRUE;
}
}
break;
case ASL_WALK_VISIT_TWICE:
while (Op)
{
if (NodePreviouslyVisited)
{
Status = AscendingCallback (Op, Level, Context);
if (ACPI_FAILURE (Status))
{
return (Status);
}
}
else
{
/* Let the callback process the node. */
Status = DescendingCallback (Op, Level, Context);
if (ACPI_SUCCESS (Status))
{
/* Visit children first, once */
if (Op->Asl.Child)
{
Level++;
Op = Op->Asl.Child;
continue;
}
}
else if (Status != AE_CTRL_DEPTH)
{
/* Exit immediately on any error */
return (Status);
}
}
/* Terminate walk at start op */
if (Op == StartOp)
{
break;
}
/* No more children, visit peers */
if (Op->Asl.Next)
{
Op = Op->Asl.Next;
NodePreviouslyVisited = FALSE;
}
else
{
/* No children or peers, re-visit parent */
if (Level != 0 )
{
Level--;
}
Op = Op->Asl.Parent;
NodePreviouslyVisited = TRUE;
}
}
break;
default:
/* No other types supported */
break;
}
/* If we get here, the walk completed with no errors */
return (AE_OK);
}