1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
328 lines
7.7 KiB
C
328 lines
7.7 KiB
C
/******************************************************************************
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*
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* Module Name: pstree - Parser op tree manipulation/traversal/search
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*
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*****************************************************************************/
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/*
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* Copyright (C) 2000 - 2005, R. Byron Moore
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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 <acpi/acpi.h>
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#include <acpi/acparser.h>
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#include <acpi/amlcode.h>
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#define _COMPONENT ACPI_PARSER
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ACPI_MODULE_NAME ("pstree")
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/*******************************************************************************
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*
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* FUNCTION: acpi_ps_get_arg
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*
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* PARAMETERS: Op - Get an argument for this op
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* Argn - Nth argument to get
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*
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* RETURN: The argument (as an Op object). NULL if argument does not exist
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*
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* DESCRIPTION: Get the specified op's argument.
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*
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******************************************************************************/
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union acpi_parse_object *
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acpi_ps_get_arg (
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union acpi_parse_object *op,
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u32 argn)
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{
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union acpi_parse_object *arg = NULL;
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const struct acpi_opcode_info *op_info;
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ACPI_FUNCTION_ENTRY ();
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/* Get the info structure for this opcode */
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op_info = acpi_ps_get_opcode_info (op->common.aml_opcode);
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if (op_info->class == AML_CLASS_UNKNOWN) {
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/* Invalid opcode or ASCII character */
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return (NULL);
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}
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/* Check if this opcode requires argument sub-objects */
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if (!(op_info->flags & AML_HAS_ARGS)) {
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/* Has no linked argument objects */
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return (NULL);
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}
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/* Get the requested argument object */
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arg = op->common.value.arg;
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while (arg && argn) {
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argn--;
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arg = arg->common.next;
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}
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return (arg);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ps_append_arg
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*
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* PARAMETERS: Op - Append an argument to this Op.
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* Arg - Argument Op to append
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*
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* RETURN: None.
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*
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* DESCRIPTION: Append an argument to an op's argument list (a NULL arg is OK)
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*
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******************************************************************************/
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void
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acpi_ps_append_arg (
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union acpi_parse_object *op,
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union acpi_parse_object *arg)
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{
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union acpi_parse_object *prev_arg;
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const struct acpi_opcode_info *op_info;
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ACPI_FUNCTION_ENTRY ();
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if (!op) {
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return;
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}
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/* Get the info structure for this opcode */
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op_info = acpi_ps_get_opcode_info (op->common.aml_opcode);
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if (op_info->class == AML_CLASS_UNKNOWN) {
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/* Invalid opcode */
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ACPI_REPORT_ERROR (("ps_append_arg: Invalid AML Opcode: 0x%2.2X\n",
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op->common.aml_opcode));
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return;
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}
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/* Check if this opcode requires argument sub-objects */
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if (!(op_info->flags & AML_HAS_ARGS)) {
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/* Has no linked argument objects */
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return;
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}
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/* Append the argument to the linked argument list */
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if (op->common.value.arg) {
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/* Append to existing argument list */
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prev_arg = op->common.value.arg;
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while (prev_arg->common.next) {
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prev_arg = prev_arg->common.next;
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}
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prev_arg->common.next = arg;
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}
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else {
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/* No argument list, this will be the first argument */
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op->common.value.arg = arg;
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}
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/* Set the parent in this arg and any args linked after it */
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while (arg) {
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arg->common.parent = op;
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arg = arg->common.next;
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}
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}
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#ifdef ACPI_FUTURE_USAGE
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/*******************************************************************************
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*
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* FUNCTION: acpi_ps_get_child
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*
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* PARAMETERS: Op - Get the child of this Op
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*
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* RETURN: Child Op, Null if none is found.
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*
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* DESCRIPTION: Get op's children or NULL if none
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*
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******************************************************************************/
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union acpi_parse_object *
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acpi_ps_get_child (
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union acpi_parse_object *op)
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{
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union acpi_parse_object *child = NULL;
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ACPI_FUNCTION_ENTRY ();
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switch (op->common.aml_opcode) {
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case AML_SCOPE_OP:
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case AML_ELSE_OP:
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case AML_DEVICE_OP:
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case AML_THERMAL_ZONE_OP:
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case AML_INT_METHODCALL_OP:
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child = acpi_ps_get_arg (op, 0);
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break;
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case AML_BUFFER_OP:
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case AML_PACKAGE_OP:
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case AML_METHOD_OP:
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case AML_IF_OP:
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case AML_WHILE_OP:
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case AML_FIELD_OP:
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child = acpi_ps_get_arg (op, 1);
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break;
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case AML_POWER_RES_OP:
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case AML_INDEX_FIELD_OP:
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child = acpi_ps_get_arg (op, 2);
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break;
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case AML_PROCESSOR_OP:
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case AML_BANK_FIELD_OP:
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child = acpi_ps_get_arg (op, 3);
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break;
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default:
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/* All others have no children */
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break;
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}
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return (child);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ps_get_depth_next
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*
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* PARAMETERS: Origin - Root of subtree to search
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* Op - Last (previous) Op that was found
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*
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* RETURN: Next Op found in the search.
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*
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* DESCRIPTION: Get next op in tree (walking the tree in depth-first order)
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* Return NULL when reaching "origin" or when walking up from root
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*
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******************************************************************************/
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union acpi_parse_object *
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acpi_ps_get_depth_next (
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union acpi_parse_object *origin,
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union acpi_parse_object *op)
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{
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union acpi_parse_object *next = NULL;
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union acpi_parse_object *parent;
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union acpi_parse_object *arg;
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ACPI_FUNCTION_ENTRY ();
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if (!op) {
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return (NULL);
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}
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/* look for an argument or child */
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next = acpi_ps_get_arg (op, 0);
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if (next) {
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return (next);
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}
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/* look for a sibling */
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next = op->common.next;
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if (next) {
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return (next);
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}
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/* look for a sibling of parent */
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parent = op->common.parent;
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while (parent) {
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arg = acpi_ps_get_arg (parent, 0);
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while (arg && (arg != origin) && (arg != op)) {
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arg = arg->common.next;
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}
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if (arg == origin) {
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/* reached parent of origin, end search */
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return (NULL);
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}
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if (parent->common.next) {
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/* found sibling of parent */
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return (parent->common.next);
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}
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op = parent;
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parent = parent->common.parent;
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}
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return (next);
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}
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#endif /* ACPI_FUTURE_USAGE */
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