7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek/*******************************************************************************
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * Module Name: dmcstyle - Support for C-style operator disassembly
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek ******************************************************************************/
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * Copyright (C) 2000 - 2016, Intel Corp.
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * All rights reserved.
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * Redistribution and use in source and binary forms, with or without
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * modification, are permitted provided that the following conditions
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * 1. Redistributions of source code must retain the above copyright
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * notice, this list of conditions, and the following disclaimer,
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * without modification.
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * 2. Redistributions in binary form must reproduce at minimum a disclaimer
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * substantially similar to the "NO WARRANTY" disclaimer below
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * ("Disclaimer") and any redistribution must be conditioned upon
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * including a substantially similar Disclaimer requirement for further
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * binary redistribution.
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * 3. Neither the names of the above-listed copyright holders nor the names
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * of any contributors may be used to endorse or promote products derived
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * from this software without specific prior written permission.
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * Alternatively, this software may be distributed under the terms of the
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * GNU General Public License ("GPL") version 2 as published by the Free
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * Software Foundation.
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * NO WARRANTY
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * POSSIBILITY OF SUCH DAMAGES.
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek/* Local prototypes */
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek/*******************************************************************************
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * FUNCTION: AcpiDmCheckForSymbolicOpcode
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * PARAMETERS: Op - Current parse object
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * Walk - Current parse tree walk info
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * RETURN: TRUE if opcode can be converted to symbolic, FALSE otherwise
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * DESCRIPTION: This is the main code that implements disassembly of AML code
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * to C-style operators. Called during descending phase of the
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * parse tree walk.
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek ******************************************************************************/
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek /* Exit immediately if ASL+ not enabled */
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek /* Get the first operand */
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek /* Get the second operand */
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek /* Setup the operator string for this opcode */
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek /* Logical operators, no target */
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * Check for the LNOT sub-opcodes. These correspond to
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * LNotEqual, LLessEqual, and LGreaterEqual. There are
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * no actual AML opcodes for these operators.
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek /* Unary LNOT case, emit "!" immediately */
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek Child1->Common.DisasmOpcode = ACPI_DASM_LNOT_SUFFIX;
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek Op->Common.DisasmOpcode = ACPI_DASM_LNOT_PREFIX;
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek Op->Common.DisasmFlags |= ACPI_PARSEOP_COMPOUND_ASSIGNMENT;
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek /* Save symbol string in the next child (not peer) */
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek Child2->Common.OperatorSymbol = OperatorSymbol;
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * Check for constant source operand. Note: although technically
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * legal syntax, the iASL compiler does not support this with
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * the symbolic operators for Index(). It doesn't make sense to
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * use Index() with a constant anyway.
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek if ((Child1->Common.AmlOpcode == AML_STRING_OP) ||
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek (Child1->Common.AmlOpcode == AML_BUFFER_OP) ||
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek (Child1->Common.AmlOpcode == AML_PACKAGE_OP) ||
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek (Child1->Common.AmlOpcode == AML_VAR_PACKAGE_OP))
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek Op->Common.DisasmFlags |= ACPI_PARSEOP_CLOSING_PAREN;
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek /* Index operator is [] */
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek /* Unary operators */
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek if (Child1->Common.DisasmOpcode == ACPI_DASM_LNOT_SUFFIX)
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * This is the key to how the disassembly of the C-style operators
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * works. We save the operator symbol in the first child, thus
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * deferring symbol output until after the first operand has been
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek Child1->Common.OperatorSymbol = OperatorSymbol;
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * Check for a valid target as the 3rd (or sometimes 2nd) operand
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * Compound assignment operator support:
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * Attempt to optimize constructs of the form:
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * Add (Local1, 0xFF, Local1)
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * Local1 += 0xFF
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * Only the math operators and Store() have a target.
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * Logicals have no target.
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek /* Target is 3rd operand */
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * Divide has an extra target operand (Remainder).
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * If this extra target is specified, it cannot be converted
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * to a C-style operator
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek Target->Common.DisasmFlags |= ACPI_PARSEOP_IGNORE;
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek /* Parser should ensure there is at least a placeholder target */
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek /* Not a valid target (placeholder only, from parser) */
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * Promote the target up to the first child in the parse
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * tree. This is done because the target will be output
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * first, in the form:
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * <Target> = Operands...
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek /* Check operands for conversion to a "Compound Assignment" */
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek /* Commutative operators */
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * For the commutative operators, we can convert to a
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * compound statement only if at least one (either) operand
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * is the same as the target.
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * Add (A, B, A) --> A += B
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * Add (B, A, A) --> A += B
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * Add (B, C, A) --> A = (B + C)
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek if ((AcpiDmIsTargetAnOperand (Target, Child1, TRUE)) ||
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek (AcpiDmIsTargetAnOperand (Target, Child2, TRUE)))
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek AcpiDmGetCompoundSymbol (Op->Common.AmlOpcode);
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek /* Convert operator to compound assignment */
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek Op->Common.DisasmFlags |= ACPI_PARSEOP_COMPOUND_ASSIGNMENT;
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek /* Non-commutative operators */
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * For the non-commutative operators, we can convert to a
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * compound statement only if the target is the same as the
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * first operand.
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * Subtract (A, B, A) --> A -= B
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * Subtract (B, A, A) --> A = (B - A)
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek if ((AcpiDmIsTargetAnOperand (Target, Child1, TRUE)))
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek AcpiDmGetCompoundSymbol (Op->Common.AmlOpcode);
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek /* Convert operator to compound assignment */
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek Op->Common.DisasmFlags |= ACPI_PARSEOP_COMPOUND_ASSIGNMENT;
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * If we are within a C-style expression, emit an extra open
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * paren. Implemented by examining the parent op.
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek Op->Common.DisasmFlags |= ACPI_PARSEOP_ASSIGNMENT;
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek /* Normal output for ASL/AML operators with a target operand */
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek /* Binary operators, no parens */
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek /* Target is optional, 3rd operand */
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * Target is the 2nd operand.
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * We know the target is valid, it is not optional.
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * In the parse tree, simply swap the target with the
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * source so that the target is processed first.
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek /* Target is optional, 2nd operand */
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek /* Valid target, not a placeholder */
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek /* No target. Emit this prefix operator immediately */
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * Nodes marked with ACPI_PARSEOP_PARAMLIST don't need a parens
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * output here. We also need to check the parent to see if this op
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * is part of a compound test (!=, >=, <=).
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek if ((Op->Common.DisasmFlags & ACPI_PARSEOP_PARAMETER_LIST) ||
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek ((Op->Common.Parent->Common.DisasmFlags & ACPI_PARSEOP_PARAMETER_LIST) &&
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek (Op->Common.DisasmOpcode == ACPI_DASM_LNOT_SUFFIX)))
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek /* Do Nothing. Paren already generated */
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek /* All other operators, emit an open paren */
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek/*******************************************************************************
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * FUNCTION: AcpiDmCloseOperator
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * PARAMETERS: Op - Current parse object
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * RETURN: None
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * DESCRIPTION: Closes an operator by adding a closing parentheses if and
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * when necessary. Called during ascending phase of the
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * parse tree walk.
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek ******************************************************************************/
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek /* Always emit paren if ASL+ disassembly disabled */
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek /* Check if we need to add an additional closing paren */
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek /* Emit paren only if this is not a compound assignment */
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek if (Op->Common.DisasmFlags & ACPI_PARSEOP_COMPOUND_ASSIGNMENT)
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek /* Emit extra close paren for assignment within an expression */
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek if (Op->Common.DisasmFlags & ACPI_PARSEOP_ASSIGNMENT)
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek /* This is case for unsupported Index() source constants */
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek if (Op->Common.DisasmFlags & ACPI_PARSEOP_CLOSING_PAREN)
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek /* No need for parens for these */
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek /* Always emit paren for non-ASL+ operators */
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * Nodes marked with ACPI_PARSEOP_PARAMLIST don't need a parens
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * output here. We also need to check the parent to see if this op
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * is part of a compound test (!=, >=, <=).
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek ((Op->Common.DisasmFlags & ACPI_PARSEOP_PARAMETER_LIST) ||
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek ((Op->Common.Parent->Common.DisasmFlags & ACPI_PARSEOP_PARAMETER_LIST) &&
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek (Op->Common.DisasmOpcode == ACPI_DASM_LNOT_SUFFIX))))
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek/*******************************************************************************
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * FUNCTION: AcpiDmGetCompoundSymbol
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * PARAMETERS: AslOpcode
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * RETURN: String containing the compound assignment symbol
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * DESCRIPTION: Detect opcodes that can be converted to compound assignment,
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * return the appropriate operator string.
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek ******************************************************************************/
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek /* No operator string for all other opcodes */
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek/*******************************************************************************
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * FUNCTION: AcpiDmPromoteTarget
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * PARAMETERS: Op - Operator parse object
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * Target - Target associate with the Op
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * RETURN: None
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * DESCRIPTION: Transform the parse tree by moving the target up to the first
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * child of the Op.
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek ******************************************************************************/
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek /* Link target directly to the Op as first child */
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek /* Find the last peer, it is linked to the target. Unlink it. */
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek/*******************************************************************************
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * FUNCTION: AcpiDmIsValidTarget
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * PARAMETERS: Target - Target Op from the parse tree
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * RETURN: TRUE if the Target is real. FALSE if it is just a placeholder
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * Op that was inserted by the parser.
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * DESCRIPTION: Determine if a Target Op is a placeholder Op or a real Target.
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * In other words, determine if the optional target is used or
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * not. Note: If Target is NULL, something is seriously wrong,
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * probably with the parse tree.
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek ******************************************************************************/
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek if ((Target->Common.AmlOpcode == AML_INT_NAMEPATH_OP) &&
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek/*******************************************************************************
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * FUNCTION: AcpiDmIsTargetAnOperand
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * PARAMETERS: Target - Target associated with the expression
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * Operand - An operand associated with expression
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * RETURN: TRUE if expression can be converted to a compound assignment.
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * FALSE otherwise.
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * DESCRIPTION: Determine if the Target duplicates the operand, in order to
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * detect if the expression can be converted to a compound
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * assigment. (+=, *=, etc.)
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek ******************************************************************************/
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * Opcodes must match. Note: ignoring the difference between nameseg
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek * and namepath for now. May be needed later.
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek if (Target->Common.AmlOpcode != Operand->Common.AmlOpcode)
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek /* Nodes should match, even if they are NULL */
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek if (Target->Common.Node != Operand->Common.Node)
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek /* Determine if a child exists */
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek OpInfo = AcpiPsGetOpcodeInfo (Operand->Common.AmlOpcode);
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek Same = AcpiDmIsTargetAnOperand (Target->Common.Value.Arg,
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek /* Check the next peer, as long as we are not at the top level */
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek Same = AcpiDmIsTargetAnOperand (Target->Common.Next,
7b1019a6d29ccb7999dc76cba3dde1c627e8e609Jerry Jelinek /* Supress the duplicate operand at the top-level */