/******************************************************************************
 *
 * Module Name: dswexec - Dispatcher method execution callbacks;
 *                        dispatch to interpreter.
 *
 *****************************************************************************/

/*
 * Copyright (C) 2000 - 2015, 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 <acpi/acpi.h>
#include "accommon.h"
#include "acparser.h"
#include "amlcode.h"
#include "acdispat.h"
#include "acinterp.h"
#include "acnamesp.h"
#include "acdebug.h"

#define _COMPONENT          ACPI_DISPATCHER
ACPI_MODULE_NAME("dswexec")

/*
 * Dispatch table for opcode classes
 */
static acpi_execute_op acpi_gbl_op_type_dispatch[] = {
        acpi_ex_opcode_0A_0T_1R,
        acpi_ex_opcode_1A_0T_0R,
        acpi_ex_opcode_1A_0T_1R,
        acpi_ex_opcode_1A_1T_0R,
        acpi_ex_opcode_1A_1T_1R,
        acpi_ex_opcode_2A_0T_0R,
        acpi_ex_opcode_2A_0T_1R,
        acpi_ex_opcode_2A_1T_1R,
        acpi_ex_opcode_2A_2T_1R,
        acpi_ex_opcode_3A_0T_0R,
        acpi_ex_opcode_3A_1T_1R,
        acpi_ex_opcode_6A_0T_1R
};

/*****************************************************************************
 *
 * FUNCTION:    acpi_ds_get_predicate_value
 *
 * PARAMETERS:  walk_state      - Current state of the parse tree walk
 *              result_obj      - if non-zero, pop result from result stack
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Get the result of a predicate evaluation
 *
 ****************************************************************************/

acpi_status
acpi_ds_get_predicate_value(struct acpi_walk_state *walk_state,
                            union acpi_operand_object *result_obj)
{
        acpi_status status = AE_OK;
        union acpi_operand_object *obj_desc;
        union acpi_operand_object *local_obj_desc = NULL;

        ACPI_FUNCTION_TRACE_PTR(ds_get_predicate_value, walk_state);

        walk_state->control_state->common.state = 0;

        if (result_obj) {
                status = acpi_ds_result_pop(&obj_desc, walk_state);
                if (ACPI_FAILURE(status)) {
                        ACPI_EXCEPTION((AE_INFO, status,
                                        "Could not get result from predicate evaluation"));

                        return_ACPI_STATUS(status);
                }
        } else {
                status = acpi_ds_create_operand(walk_state, walk_state->op, 0);
                if (ACPI_FAILURE(status)) {
                        return_ACPI_STATUS(status);
                }

                status =
                    acpi_ex_resolve_to_value(&walk_state->operands[0],
                                             walk_state);
                if (ACPI_FAILURE(status)) {
                        return_ACPI_STATUS(status);
                }

                obj_desc = walk_state->operands[0];
        }

        if (!obj_desc) {
                ACPI_ERROR((AE_INFO,
                            "No predicate ObjDesc=%p State=%p",
                            obj_desc, walk_state));

                return_ACPI_STATUS(AE_AML_NO_OPERAND);
        }

        /*
         * Result of predicate evaluation must be an Integer
         * object. Implicitly convert the argument if necessary.
         */
        status = acpi_ex_convert_to_integer(obj_desc, &local_obj_desc, 16);
        if (ACPI_FAILURE(status)) {
                goto cleanup;
        }

        if (local_obj_desc->common.type != ACPI_TYPE_INTEGER) {
                ACPI_ERROR((AE_INFO,
                            "Bad predicate (not an integer) ObjDesc=%p State=%p Type=0x%X",
                            obj_desc, walk_state, obj_desc->common.type));

                status = AE_AML_OPERAND_TYPE;
                goto cleanup;
        }

        /* Truncate the predicate to 32-bits if necessary */

        (void)acpi_ex_truncate_for32bit_table(local_obj_desc);

        /*
         * Save the result of the predicate evaluation on
         * the control stack
         */
        if (local_obj_desc->integer.value) {
                walk_state->control_state->common.value = TRUE;
        } else {
                /*
                 * Predicate is FALSE, we will just toss the
                 * rest of the package
                 */
                walk_state->control_state->common.value = FALSE;
                status = AE_CTRL_FALSE;
        }

        /* Predicate can be used for an implicit return value */

        (void)acpi_ds_do_implicit_return(local_obj_desc, walk_state, TRUE);

cleanup:

        ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Completed a predicate eval=%X Op=%p\n",
                          walk_state->control_state->common.value,
                          walk_state->op));

        /* Break to debugger to display result */

        ACPI_DEBUGGER_EXEC(acpi_db_display_result_object
                           (local_obj_desc, walk_state));

        /*
         * Delete the predicate result object (we know that
         * we don't need it anymore)
         */
        if (local_obj_desc != obj_desc) {
                acpi_ut_remove_reference(local_obj_desc);
        }
        acpi_ut_remove_reference(obj_desc);

        walk_state->control_state->common.state = ACPI_CONTROL_NORMAL;
        return_ACPI_STATUS(status);
}

/*****************************************************************************
 *
 * FUNCTION:    acpi_ds_exec_begin_op
 *
 * PARAMETERS:  walk_state      - Current state of the parse tree walk
 *              out_op          - Where to return op if a new one is created
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Descending callback used during the execution of control
 *              methods. This is where most operators and operands are
 *              dispatched to the interpreter.
 *
 ****************************************************************************/

acpi_status
acpi_ds_exec_begin_op(struct acpi_walk_state *walk_state,
                      union acpi_parse_object **out_op)
{
        union acpi_parse_object *op;
        acpi_status status = AE_OK;
        u32 opcode_class;

        ACPI_FUNCTION_TRACE_PTR(ds_exec_begin_op, walk_state);

        op = walk_state->op;
        if (!op) {
                status = acpi_ds_load2_begin_op(walk_state, out_op);
                if (ACPI_FAILURE(status)) {
                        goto error_exit;
                }

                op = *out_op;
                walk_state->op = op;
                walk_state->opcode = op->common.aml_opcode;
                walk_state->op_info =
                    acpi_ps_get_opcode_info(op->common.aml_opcode);

                if (acpi_ns_opens_scope(walk_state->op_info->object_type)) {
                        ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
                                          "(%s) Popping scope for Op %p\n",
                                          acpi_ut_get_type_name(walk_state->
                                                                op_info->
                                                                object_type),
                                          op));

                        status = acpi_ds_scope_stack_pop(walk_state);
                        if (ACPI_FAILURE(status)) {
                                goto error_exit;
                        }
                }
        }

        if (op == walk_state->origin) {
                if (out_op) {
                        *out_op = op;
                }

                return_ACPI_STATUS(AE_OK);
        }

        /*
         * If the previous opcode was a conditional, this opcode
         * must be the beginning of the associated predicate.
         * Save this knowledge in the current scope descriptor
         */
        if ((walk_state->control_state) &&
            (walk_state->control_state->common.state ==
             ACPI_CONTROL_CONDITIONAL_EXECUTING)) {
                ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
                                  "Exec predicate Op=%p State=%p\n", op,
                                  walk_state));

                walk_state->control_state->common.state =
                    ACPI_CONTROL_PREDICATE_EXECUTING;

                /* Save start of predicate */

                walk_state->control_state->control.predicate_op = op;
        }

        opcode_class = walk_state->op_info->class;

        /* We want to send namepaths to the load code */

        if (op->common.aml_opcode == AML_INT_NAMEPATH_OP) {
                opcode_class = AML_CLASS_NAMED_OBJECT;
        }

        /*
         * Handle the opcode based upon the opcode type
         */
        switch (opcode_class) {
        case AML_CLASS_CONTROL:

                status = acpi_ds_exec_begin_control_op(walk_state, op);
                break;

        case AML_CLASS_NAMED_OBJECT:

                if (walk_state->walk_type & ACPI_WALK_METHOD) {
                        /*
                         * Found a named object declaration during method execution;
                         * we must enter this object into the namespace. The created
                         * object is temporary and will be deleted upon completion of
                         * the execution of this method.
                         *
                         * Note 10/2010: Except for the Scope() op. This opcode does
                         * not actually create a new object, it refers to an existing
                         * object. However, for Scope(), we want to indeed open a
                         * new scope.
                         */
                        if (op->common.aml_opcode != AML_SCOPE_OP) {
                                status =
                                    acpi_ds_load2_begin_op(walk_state, NULL);
                        } else {
                                status =
                                    acpi_ds_scope_stack_push(op->named.node,
                                                             op->named.node->
                                                             type, walk_state);
                                if (ACPI_FAILURE(status)) {
                                        return_ACPI_STATUS(status);
                                }
                        }
                }
                break;

        case AML_CLASS_EXECUTE:
        case AML_CLASS_CREATE:

                break;

        default:

                break;
        }

        /* Nothing to do here during method execution */

        return_ACPI_STATUS(status);

error_exit:
        status = acpi_ds_method_error(status, walk_state);
        return_ACPI_STATUS(status);
}

/*****************************************************************************
 *
 * FUNCTION:    acpi_ds_exec_end_op
 *
 * PARAMETERS:  walk_state      - Current state of the parse tree walk
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Ascending callback used during the execution of control
 *              methods. The only thing we really need to do here is to
 *              notice the beginning of IF, ELSE, and WHILE blocks.
 *
 ****************************************************************************/

acpi_status acpi_ds_exec_end_op(struct acpi_walk_state *walk_state)
{
        union acpi_parse_object *op;
        acpi_status status = AE_OK;
        u32 op_type;
        u32 op_class;
        union acpi_parse_object *next_op;
        union acpi_parse_object *first_arg;

        ACPI_FUNCTION_TRACE_PTR(ds_exec_end_op, walk_state);

        op = walk_state->op;
        op_type = walk_state->op_info->type;
        op_class = walk_state->op_info->class;

        if (op_class == AML_CLASS_UNKNOWN) {
                ACPI_ERROR((AE_INFO, "Unknown opcode 0x%X",
                            op->common.aml_opcode));
                return_ACPI_STATUS(AE_NOT_IMPLEMENTED);
        }

        first_arg = op->common.value.arg;

        /* Init the walk state */

        walk_state->num_operands = 0;
        walk_state->operand_index = 0;
        walk_state->return_desc = NULL;
        walk_state->result_obj = NULL;

        /* Call debugger for single step support (DEBUG build only) */

        ACPI_DEBUGGER_EXEC(status =
                           acpi_db_single_step(walk_state, op, op_class));
        ACPI_DEBUGGER_EXEC(if (ACPI_FAILURE(status)) {
                           return_ACPI_STATUS(status);}
        ) ;

        /* Decode the Opcode Class */

        switch (op_class) {
        case AML_CLASS_ARGUMENT:        /* Constants, literals, etc. */

                if (walk_state->opcode == AML_INT_NAMEPATH_OP) {
                        status = acpi_ds_evaluate_name_path(walk_state);
                        if (ACPI_FAILURE(status)) {
                                goto cleanup;
                        }
                }
                break;

        case AML_CLASS_EXECUTE: /* Most operators with arguments */

                /* Build resolved operand stack */

                status = acpi_ds_create_operands(walk_state, first_arg);
                if (ACPI_FAILURE(status)) {
                        goto cleanup;
                }

                /*
                 * All opcodes require operand resolution, with the only exceptions
                 * being the object_type and size_of operators.
                 */
                if (!(walk_state->op_info->flags & AML_NO_OPERAND_RESOLVE)) {

                        /* Resolve all operands */

                        status = acpi_ex_resolve_operands(walk_state->opcode,
                                                          &(walk_state->
                                                            operands
                                                            [walk_state->
                                                             num_operands - 1]),
                                                          walk_state);
                }

                if (ACPI_SUCCESS(status)) {
                        /*
                         * Dispatch the request to the appropriate interpreter handler
                         * routine. There is one routine per opcode "type" based upon the
                         * number of opcode arguments and return type.
                         */
                        status =
                            acpi_gbl_op_type_dispatch[op_type] (walk_state);
                } else {
                        /*
                         * Treat constructs of the form "Store(LocalX,LocalX)" as noops when the
                         * Local is uninitialized.
                         */
                        if ((status == AE_AML_UNINITIALIZED_LOCAL) &&
                            (walk_state->opcode == AML_STORE_OP) &&
                            (walk_state->operands[0]->common.type ==
                             ACPI_TYPE_LOCAL_REFERENCE)
                            && (walk_state->operands[1]->common.type ==
                                ACPI_TYPE_LOCAL_REFERENCE)
                            && (walk_state->operands[0]->reference.class ==
                                walk_state->operands[1]->reference.class)
                            && (walk_state->operands[0]->reference.value ==
                                walk_state->operands[1]->reference.value)) {
                                status = AE_OK;
                        } else {
                                ACPI_EXCEPTION((AE_INFO, status,
                                                "While resolving operands for [%s]",
                                                acpi_ps_get_opcode_name
                                                (walk_state->opcode)));
                        }
                }

                /* Always delete the argument objects and clear the operand stack */

                acpi_ds_clear_operands(walk_state);

                /*
                 * If a result object was returned from above, push it on the
                 * current result stack
                 */
                if (ACPI_SUCCESS(status) && walk_state->result_obj) {
                        status =
                            acpi_ds_result_push(walk_state->result_obj,
                                                walk_state);
                }
                break;

        default:

                switch (op_type) {
                case AML_TYPE_CONTROL:  /* Type 1 opcode, IF/ELSE/WHILE/NOOP */

                        /* 1 Operand, 0 external_result, 0 internal_result */

                        status = acpi_ds_exec_end_control_op(walk_state, op);

                        break;

                case AML_TYPE_METHOD_CALL:
                        /*
                         * If the method is referenced from within a package
                         * declaration, it is not a invocation of the method, just
                         * a reference to it.
                         */
                        if ((op->asl.parent) &&
                            ((op->asl.parent->asl.aml_opcode == AML_PACKAGE_OP)
                             || (op->asl.parent->asl.aml_opcode ==
                                 AML_VAR_PACKAGE_OP))) {
                                ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
                                                  "Method Reference in a Package, Op=%p\n",
                                                  op));

                                op->common.node =
                                    (struct acpi_namespace_node *)op->asl.value.
                                    arg->asl.node;
                                acpi_ut_add_reference(op->asl.value.arg->asl.
                                                      node->object);
                                return_ACPI_STATUS(AE_OK);
                        }

                        ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
                                          "Method invocation, Op=%p\n", op));

                        /*
                         * (AML_METHODCALL) Op->Asl.Value.Arg->Asl.Node contains
                         * the method Node pointer
                         */
                        /* next_op points to the op that holds the method name */

                        next_op = first_arg;

                        /* next_op points to first argument op */

                        next_op = next_op->common.next;

                        /*
                         * Get the method's arguments and put them on the operand stack
                         */
                        status = acpi_ds_create_operands(walk_state, next_op);
                        if (ACPI_FAILURE(status)) {
                                break;
                        }

                        /*
                         * Since the operands will be passed to another control method,
                         * we must resolve all local references here (Local variables,
                         * arguments to *this* method, etc.)
                         */
                        status = acpi_ds_resolve_operands(walk_state);
                        if (ACPI_FAILURE(status)) {

                                /* On error, clear all resolved operands */

                                acpi_ds_clear_operands(walk_state);
                                break;
                        }

                        /*
                         * Tell the walk loop to preempt this running method and
                         * execute the new method
                         */
                        status = AE_CTRL_TRANSFER;

                        /*
                         * Return now; we don't want to disturb anything,
                         * especially the operand count!
                         */
                        return_ACPI_STATUS(status);

                case AML_TYPE_CREATE_FIELD:

                        ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
                                          "Executing CreateField Buffer/Index Op=%p\n",
                                          op));

                        status = acpi_ds_load2_end_op(walk_state);
                        if (ACPI_FAILURE(status)) {
                                break;
                        }

                        status =
                            acpi_ds_eval_buffer_field_operands(walk_state, op);
                        break;

                case AML_TYPE_CREATE_OBJECT:

                        ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
                                          "Executing CreateObject (Buffer/Package) Op=%p\n",
                                          op));

                        switch (op->common.parent->common.aml_opcode) {
                        case AML_NAME_OP:
                                /*
                                 * Put the Node on the object stack (Contains the ACPI Name
                                 * of this object)
                                 */
                                walk_state->operands[0] =
                                    (void *)op->common.parent->common.node;
                                walk_state->num_operands = 1;

                                status = acpi_ds_create_node(walk_state,
                                                             op->common.parent->
                                                             common.node,
                                                             op->common.parent);
                                if (ACPI_FAILURE(status)) {
                                        break;
                                }

                                /* Fall through */
                                /*lint -fallthrough */

                        case AML_INT_EVAL_SUBTREE_OP:

                                status =
                                    acpi_ds_eval_data_object_operands
                                    (walk_state, op,
                                     acpi_ns_get_attached_object(op->common.
                                                                 parent->common.
                                                                 node));
                                break;

                        default:

                                status =
                                    acpi_ds_eval_data_object_operands
                                    (walk_state, op, NULL);
                                break;
                        }

                        /*
                         * If a result object was returned from above, push it on the
                         * current result stack
                         */
                        if (walk_state->result_obj) {
                                status =
                                    acpi_ds_result_push(walk_state->result_obj,
                                                        walk_state);
                        }
                        break;

                case AML_TYPE_NAMED_FIELD:
                case AML_TYPE_NAMED_COMPLEX:
                case AML_TYPE_NAMED_SIMPLE:
                case AML_TYPE_NAMED_NO_OBJ:

                        status = acpi_ds_load2_end_op(walk_state);
                        if (ACPI_FAILURE(status)) {
                                break;
                        }

                        if (op->common.aml_opcode == AML_REGION_OP) {
                                ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
                                                  "Executing OpRegion Address/Length Op=%p\n",
                                                  op));

                                status =
                                    acpi_ds_eval_region_operands(walk_state,
                                                                 op);
                                if (ACPI_FAILURE(status)) {
                                        break;
                                }
                        } else if (op->common.aml_opcode == AML_DATA_REGION_OP) {
                                ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
                                                  "Executing DataTableRegion Strings Op=%p\n",
                                                  op));

                                status =
                                    acpi_ds_eval_table_region_operands
                                    (walk_state, op);
                                if (ACPI_FAILURE(status)) {
                                        break;
                                }
                        } else if (op->common.aml_opcode == AML_BANK_FIELD_OP) {
                                ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
                                                  "Executing BankField Op=%p\n",
                                                  op));

                                status =
                                    acpi_ds_eval_bank_field_operands(walk_state,
                                                                     op);
                                if (ACPI_FAILURE(status)) {
                                        break;
                                }
                        }
                        break;

                case AML_TYPE_UNDEFINED:

                        ACPI_ERROR((AE_INFO,
                                    "Undefined opcode type Op=%p", op));
                        return_ACPI_STATUS(AE_NOT_IMPLEMENTED);

                case AML_TYPE_BOGUS:

                        ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
                                          "Internal opcode=%X type Op=%p\n",
                                          walk_state->opcode, op));
                        break;

                default:

                        ACPI_ERROR((AE_INFO,
                                    "Unimplemented opcode, class=0x%X type=0x%X Opcode=0x%X Op=%p",
                                    op_class, op_type, op->common.aml_opcode,
                                    op));

                        status = AE_NOT_IMPLEMENTED;
                        break;
                }
        }

        /*
         * ACPI 2.0 support for 64-bit integers: Truncate numeric
         * result value if we are executing from a 32-bit ACPI table
         */
        (void)acpi_ex_truncate_for32bit_table(walk_state->result_obj);

        /*
         * Check if we just completed the evaluation of a
         * conditional predicate
         */
        if ((ACPI_SUCCESS(status)) &&
            (walk_state->control_state) &&
            (walk_state->control_state->common.state ==
             ACPI_CONTROL_PREDICATE_EXECUTING) &&
            (walk_state->control_state->control.predicate_op == op)) {
                status =
                    acpi_ds_get_predicate_value(walk_state,
                                                walk_state->result_obj);
                walk_state->result_obj = NULL;
        }

cleanup:

        if (walk_state->result_obj) {

                /* Break to debugger to display result */

                ACPI_DEBUGGER_EXEC(acpi_db_display_result_object
                                   (walk_state->result_obj, walk_state));

                /*
                 * Delete the result op if and only if:
                 * Parent will not use the result -- such as any
                 * non-nested type2 op in a method (parent will be method)
                 */
                acpi_ds_delete_result_if_not_used(op, walk_state->result_obj,
                                                  walk_state);
        }
#ifdef _UNDER_DEVELOPMENT

        if (walk_state->parser_state.aml == walk_state->parser_state.aml_end) {
                acpi_db_method_end(walk_state);
        }
#endif

        /* Invoke exception handler on error */

        if (ACPI_FAILURE(status)) {
                status = acpi_ds_method_error(status, walk_state);
        }

        /* Always clear the object stack */

        walk_state->num_operands = 0;
        return_ACPI_STATUS(status);
}