291 lines
8.5 KiB
C
291 lines
8.5 KiB
C
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/******************************************************************************
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*
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* Module Name: psscope - Parser scope stack management routines
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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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#define _COMPONENT ACPI_PARSER
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ACPI_MODULE_NAME ("psscope")
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/*******************************************************************************
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*
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* FUNCTION: acpi_ps_get_parent_scope
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*
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* PARAMETERS: parser_state - Current parser state object
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*
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* RETURN: Pointer to an Op object
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*
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* DESCRIPTION: Get parent of current op being parsed
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*
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******************************************************************************/
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union acpi_parse_object *
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acpi_ps_get_parent_scope (
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struct acpi_parse_state *parser_state)
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{
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return (parser_state->scope->parse_scope.op);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ps_has_completed_scope
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*
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* PARAMETERS: parser_state - Current parser state object
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*
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* RETURN: Boolean, TRUE = scope completed.
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*
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* DESCRIPTION: Is parsing of current argument complete? Determined by
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* 1) AML pointer is at or beyond the end of the scope
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* 2) The scope argument count has reached zero.
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*
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******************************************************************************/
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u8
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acpi_ps_has_completed_scope (
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struct acpi_parse_state *parser_state)
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{
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return ((u8) ((parser_state->aml >= parser_state->scope->parse_scope.arg_end ||
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!parser_state->scope->parse_scope.arg_count)));
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ps_init_scope
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*
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* PARAMETERS: parser_state - Current parser state object
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* Root - the Root Node of this new scope
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*
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* RETURN: Status
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*
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* DESCRIPTION: Allocate and init a new scope object
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*
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******************************************************************************/
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acpi_status
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acpi_ps_init_scope (
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struct acpi_parse_state *parser_state,
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union acpi_parse_object *root_op)
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{
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union acpi_generic_state *scope;
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ACPI_FUNCTION_TRACE_PTR ("ps_init_scope", root_op);
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scope = acpi_ut_create_generic_state ();
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if (!scope) {
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return_ACPI_STATUS (AE_NO_MEMORY);
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}
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scope->common.data_type = ACPI_DESC_TYPE_STATE_RPSCOPE;
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scope->parse_scope.op = root_op;
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scope->parse_scope.arg_count = ACPI_VAR_ARGS;
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scope->parse_scope.arg_end = parser_state->aml_end;
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scope->parse_scope.pkg_end = parser_state->aml_end;
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parser_state->scope = scope;
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parser_state->start_op = root_op;
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return_ACPI_STATUS (AE_OK);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ps_push_scope
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*
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* PARAMETERS: parser_state - Current parser state object
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* Op - Current op to be pushed
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* remaining_args - List of args remaining
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* arg_count - Fixed or variable number of args
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*
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* RETURN: Status
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*
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* DESCRIPTION: Push current op to begin parsing its argument
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*
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******************************************************************************/
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acpi_status
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acpi_ps_push_scope (
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struct acpi_parse_state *parser_state,
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union acpi_parse_object *op,
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u32 remaining_args,
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u32 arg_count)
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{
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union acpi_generic_state *scope;
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ACPI_FUNCTION_TRACE_PTR ("ps_push_scope", op);
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scope = acpi_ut_create_generic_state ();
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if (!scope) {
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return_ACPI_STATUS (AE_NO_MEMORY);
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}
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scope->common.data_type = ACPI_DESC_TYPE_STATE_PSCOPE;
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scope->parse_scope.op = op;
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scope->parse_scope.arg_list = remaining_args;
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scope->parse_scope.arg_count = arg_count;
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scope->parse_scope.pkg_end = parser_state->pkg_end;
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/* Push onto scope stack */
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acpi_ut_push_generic_state (&parser_state->scope, scope);
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if (arg_count == ACPI_VAR_ARGS) {
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/* multiple arguments */
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scope->parse_scope.arg_end = parser_state->pkg_end;
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}
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else {
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/* single argument */
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scope->parse_scope.arg_end = ACPI_TO_POINTER (ACPI_MAX_PTR);
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}
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return_ACPI_STATUS (AE_OK);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ps_pop_scope
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*
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* PARAMETERS: parser_state - Current parser state object
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* Op - Where the popped op is returned
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* arg_list - Where the popped "next argument" is
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* returned
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* arg_count - Count of objects in arg_list
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*
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* RETURN: Status
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*
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* DESCRIPTION: Return to parsing a previous op
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*
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******************************************************************************/
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void
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acpi_ps_pop_scope (
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struct acpi_parse_state *parser_state,
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union acpi_parse_object **op,
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u32 *arg_list,
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u32 *arg_count)
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{
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union acpi_generic_state *scope = parser_state->scope;
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ACPI_FUNCTION_TRACE ("ps_pop_scope");
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/*
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* Only pop the scope if there is in fact a next scope
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*/
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if (scope->common.next) {
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scope = acpi_ut_pop_generic_state (&parser_state->scope);
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/* return to parsing previous op */
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*op = scope->parse_scope.op;
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*arg_list = scope->parse_scope.arg_list;
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*arg_count = scope->parse_scope.arg_count;
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parser_state->pkg_end = scope->parse_scope.pkg_end;
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/* All done with this scope state structure */
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acpi_ut_delete_generic_state (scope);
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}
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else {
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/* empty parse stack, prepare to fetch next opcode */
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*op = NULL;
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*arg_list = 0;
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*arg_count = 0;
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}
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ACPI_DEBUG_PRINT ((ACPI_DB_PARSE, "Popped Op %p Args %X\n", *op, *arg_count));
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return_VOID;
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ps_cleanup_scope
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*
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* PARAMETERS: parser_state - Current parser state object
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*
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* RETURN: Status
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*
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* DESCRIPTION: Destroy available list, remaining stack levels, and return
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* root scope
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*
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******************************************************************************/
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void
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acpi_ps_cleanup_scope (
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struct acpi_parse_state *parser_state)
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{
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union acpi_generic_state *scope;
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ACPI_FUNCTION_TRACE_PTR ("ps_cleanup_scope", parser_state);
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if (!parser_state) {
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return_VOID;
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}
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/* Delete anything on the scope stack */
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while (parser_state->scope) {
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scope = acpi_ut_pop_generic_state (&parser_state->scope);
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acpi_ut_delete_generic_state (scope);
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}
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return_VOID;
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}
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