1 // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0 2 /****************************************************************************** 3 * 4 * Module Name: pswalk - Parser routines to walk parsed op tree(s) 5 * 6 * Copyright (C) 2000 - 2020, Intel Corp. 7 * 8 *****************************************************************************/ 9 10 #include <acpi/acpi.h> 11 #include "accommon.h" 12 #include "acparser.h" 13 14 #define _COMPONENT ACPI_PARSER 15 ACPI_MODULE_NAME("pswalk") 16 17 /******************************************************************************* 18 * 19 * FUNCTION: acpi_ps_delete_parse_tree 20 * 21 * PARAMETERS: subtree_root - Root of tree (or subtree) to delete 22 * 23 * RETURN: None 24 * 25 * DESCRIPTION: Delete a portion of or an entire parse tree. 26 * 27 ******************************************************************************/ 28 #include "amlcode.h" 29 void acpi_ps_delete_parse_tree(union acpi_parse_object *subtree_root) 30 { 31 union acpi_parse_object *op = subtree_root; 32 union acpi_parse_object *next = NULL; 33 union acpi_parse_object *parent = NULL; 34 u32 level = 0; 35 36 ACPI_FUNCTION_TRACE_PTR(ps_delete_parse_tree, subtree_root); 37 38 ACPI_DEBUG_PRINT((ACPI_DB_PARSE_TREES, " root %p\n", subtree_root)); 39 40 /* Visit all nodes in the subtree */ 41 42 while (op) { 43 if (op != parent) { 44 45 /* This is the descending case */ 46 47 if (ACPI_IS_DEBUG_ENABLED 48 (ACPI_LV_PARSE_TREES, _COMPONENT)) { 49 50 /* This debug option will print the entire parse tree */ 51 52 acpi_os_printf(" %*.s%s %p", (level * 4), 53 " ", 54 acpi_ps_get_opcode_name(op-> 55 common. 56 aml_opcode), 57 op); 58 59 if (op->named.aml_opcode == AML_INT_NAMEPATH_OP) { 60 acpi_os_printf(" %4.4s", 61 op->common.value.string); 62 } 63 if (op->named.aml_opcode == AML_STRING_OP) { 64 acpi_os_printf(" %s", 65 op->common.value.string); 66 } 67 acpi_os_printf("\n"); 68 } 69 70 /* Look for an argument or child of the current op */ 71 72 next = acpi_ps_get_arg(op, 0); 73 if (next) { 74 75 /* Still going downward in tree (Op is not completed yet) */ 76 77 op = next; 78 level++; 79 continue; 80 } 81 } 82 83 /* No more children, this Op is complete. */ 84 85 next = op->common.next; 86 parent = op->common.parent; 87 88 acpi_ps_free_op(op); 89 90 /* If we are back to the starting point, the walk is complete. */ 91 92 if (op == subtree_root) { 93 return_VOID; 94 } 95 96 if (next) { 97 op = next; 98 } else { 99 level--; 100 op = parent; 101 } 102 } 103 104 return_VOID; 105 } 106