diff options
Diffstat (limited to 'sys/contrib/dev/acpica/compiler/aslfold.c')
| -rw-r--r-- | sys/contrib/dev/acpica/compiler/aslfold.c | 1030 |
1 files changed, 1030 insertions, 0 deletions
diff --git a/sys/contrib/dev/acpica/compiler/aslfold.c b/sys/contrib/dev/acpica/compiler/aslfold.c new file mode 100644 index 000000000000..cf6709279b9a --- /dev/null +++ b/sys/contrib/dev/acpica/compiler/aslfold.c @@ -0,0 +1,1030 @@ +/****************************************************************************** + * + * Module Name: aslfold - Constant folding + * + *****************************************************************************/ + +/****************************************************************************** + * + * 1. Copyright Notice + * + * Some or all of this work - Copyright (c) 1999 - 2020, Intel Corp. + * All rights reserved. + * + * 2. License + * + * 2.1. This is your license from Intel Corp. under its intellectual property + * rights. You may have additional license terms from the party that provided + * you this software, covering your right to use that party's intellectual + * property rights. + * + * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a + * copy of the source code appearing in this file ("Covered Code") an + * irrevocable, perpetual, worldwide license under Intel's copyrights in the + * base code distributed originally by Intel ("Original Intel Code") to copy, + * make derivatives, distribute, use and display any portion of the Covered + * Code in any form, with the right to sublicense such rights; and + * + * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent + * license (with the right to sublicense), under only those claims of Intel + * patents that are infringed by the Original Intel Code, to make, use, sell, + * offer to sell, and import the Covered Code and derivative works thereof + * solely to the minimum extent necessary to exercise the above copyright + * license, and in no event shall the patent license extend to any additions + * to or modifications of the Original Intel Code. No other license or right + * is granted directly or by implication, estoppel or otherwise; + * + * The above copyright and patent license is granted only if the following + * conditions are met: + * + * 3. Conditions + * + * 3.1. Redistribution of Source with Rights to Further Distribute Source. + * Redistribution of source code of any substantial portion of the Covered + * Code or modification with rights to further distribute source must include + * the above Copyright Notice, the above License, this list of Conditions, + * and the following Disclaimer and Export Compliance provision. In addition, + * Licensee must cause all Covered Code to which Licensee contributes to + * contain a file documenting the changes Licensee made to create that Covered + * Code and the date of any change. Licensee must include in that file the + * documentation of any changes made by any predecessor Licensee. Licensee + * must include a prominent statement that the modification is derived, + * directly or indirectly, from Original Intel Code. + * + * 3.2. Redistribution of Source with no Rights to Further Distribute Source. + * Redistribution of source code of any substantial portion of the Covered + * Code or modification without rights to further distribute source must + * include the following Disclaimer and Export Compliance provision in the + * documentation and/or other materials provided with distribution. In + * addition, Licensee may not authorize further sublicense of source of any + * portion of the Covered Code, and must include terms to the effect that the + * license from Licensee to its licensee is limited to the intellectual + * property embodied in the software Licensee provides to its licensee, and + * not to intellectual property embodied in modifications its licensee may + * make. + * + * 3.3. Redistribution of Executable. Redistribution in executable form of any + * substantial portion of the Covered Code or modification must reproduce the + * above Copyright Notice, and the following Disclaimer and Export Compliance + * provision in the documentation and/or other materials provided with the + * distribution. + * + * 3.4. Intel retains all right, title, and interest in and to the Original + * Intel Code. + * + * 3.5. Neither the name Intel nor any other trademark owned or controlled by + * Intel shall be used in advertising or otherwise to promote the sale, use or + * other dealings in products derived from or relating to the Covered Code + * without prior written authorization from Intel. + * + * 4. Disclaimer and Export Compliance + * + * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED + * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE + * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE, + * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY + * UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY + * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A + * PARTICULAR PURPOSE. + * + * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES + * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR + * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT, + * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY + * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL + * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS + * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY + * LIMITED REMEDY. + * + * 4.3. Licensee shall not export, either directly or indirectly, any of this + * software or system incorporating such software without first obtaining any + * required license or other approval from the U. S. Department of Commerce or + * any other agency or department of the United States Government. In the + * event Licensee exports any such software from the United States or + * re-exports any such software from a foreign destination, Licensee shall + * ensure that the distribution and export/re-export of the software is in + * compliance with all laws, regulations, orders, or other restrictions of the + * U.S. Export Administration Regulations. Licensee agrees that neither it nor + * any of its subsidiaries will export/re-export any technical data, process, + * software, or service, directly or indirectly, to any country for which the + * United States government or any agency thereof requires an export license, + * other governmental approval, or letter of assurance, without first obtaining + * such license, approval or letter. + * + ***************************************************************************** + * + * Alternatively, you may choose to be licensed under the terms of the + * following license: + * + * 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. + * + * 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 MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * 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 DAMAGE. + * + * Alternatively, you may choose to be licensed under the terms of the + * GNU General Public License ("GPL") version 2 as published by the Free + * Software Foundation. + * + *****************************************************************************/ + +#include <contrib/dev/acpica/compiler/aslcompiler.h> +#include "aslcompiler.y.h" +#include <contrib/dev/acpica/include/amlcode.h> + +#include <contrib/dev/acpica/include/acdispat.h> +#include <contrib/dev/acpica/include/acparser.h> + +#define _COMPONENT ACPI_COMPILER + ACPI_MODULE_NAME ("aslfold") + +/* Local prototypes */ + +static ACPI_STATUS +OpcAmlEvaluationWalk1 ( + ACPI_PARSE_OBJECT *Op, + UINT32 Level, + void *Context); + +static ACPI_STATUS +OpcAmlEvaluationWalk2 ( + ACPI_PARSE_OBJECT *Op, + UINT32 Level, + void *Context); + +static ACPI_STATUS +OpcAmlCheckForConstant ( + ACPI_PARSE_OBJECT *Op, + UINT32 Level, + void *Context); + +static void +OpcUpdateIntegerNode ( + ACPI_PARSE_OBJECT *Op, + UINT64 Value); + +static ACPI_STATUS +TrTransformToStoreOp ( + ACPI_PARSE_OBJECT *Op, + ACPI_WALK_STATE *WalkState); + +static ACPI_STATUS +TrSimpleConstantReduction ( + ACPI_PARSE_OBJECT *Op, + ACPI_WALK_STATE *WalkState); + +static void +TrInstallReducedConstant ( + ACPI_PARSE_OBJECT *Op, + ACPI_OPERAND_OBJECT *ObjDesc); + + +/******************************************************************************* + * + * FUNCTION: OpcAmlConstantWalk + * + * PARAMETERS: ASL_WALK_CALLBACK + * + * RETURN: Status + * + * DESCRIPTION: Reduce an Op and its subtree to a constant if possible. + * Called during ascent of the parse tree. + * + ******************************************************************************/ + +ACPI_STATUS +OpcAmlConstantWalk ( + ACPI_PARSE_OBJECT *Op, + UINT32 Level, + void *Context) +{ + ACPI_WALK_STATE *WalkState; + ACPI_STATUS Status = AE_OK; + + + if (Op->Asl.CompileFlags == 0) + { + return (AE_OK); + } + + /* + * Only interested in subtrees that could possibly contain + * expressions that can be evaluated at this time + */ + if ((!(Op->Asl.CompileFlags & OP_COMPILE_TIME_CONST)) || + (Op->Asl.CompileFlags & OP_IS_TARGET)) + { + return (AE_OK); + } + + /* Create a new walk state */ + + WalkState = AcpiDsCreateWalkState (0, NULL, NULL, NULL); + if (!WalkState) + { + return (AE_NO_MEMORY); + } + + WalkState->NextOp = NULL; + WalkState->Params = NULL; + + /* + * Examine the entire subtree -- all nodes must be constants + * or type 3/4/5 opcodes + */ + Status = TrWalkParseTree (Op, ASL_WALK_VISIT_DOWNWARD, + OpcAmlCheckForConstant, NULL, WalkState); + + /* + * Did we find an entire subtree that contains all constants + * and type 3/4/5 opcodes? + */ + switch (Status) + { + case AE_OK: + + /* Simple case, like Add(3,4) -> 7 */ + + Status = TrSimpleConstantReduction (Op, WalkState); + break; + + case AE_CTRL_RETURN_VALUE: + + /* More complex case, like Add(3,4,Local0) -> Store(7,Local0) */ + + Status = TrTransformToStoreOp (Op, WalkState); + break; + + case AE_TYPE: + + AcpiDsDeleteWalkState (WalkState); + return (AE_OK); + + default: + AcpiDsDeleteWalkState (WalkState); + break; + } + + if (ACPI_FAILURE (Status)) + { + DbgPrint (ASL_PARSE_OUTPUT, "Cannot resolve, %s\n", + AcpiFormatException (Status)); + + /* We could not resolve the subtree for some reason */ + + AslError (ASL_ERROR, ASL_MSG_CONSTANT_EVALUATION, Op, + (char *) AcpiFormatException (Status)); + + /* Set the subtree value to ZERO anyway. Eliminates further errors */ + + OpcUpdateIntegerNode (Op, 0); + } + + return (AE_OK); +} + + +/******************************************************************************* + * + * FUNCTION: OpcAmlCheckForConstant + * + * PARAMETERS: ASL_WALK_CALLBACK + * + * RETURN: Status + * + * DESCRIPTION: Check one Op for a reducible type 3/4/5 AML opcode. + * This is performed via an upward walk of the parse subtree. + * + ******************************************************************************/ + +static ACPI_STATUS +OpcAmlCheckForConstant ( + ACPI_PARSE_OBJECT *Op, + UINT32 Level, + void *Context) +{ + ACPI_WALK_STATE *WalkState = Context; + ACPI_STATUS Status = AE_OK; + ACPI_PARSE_OBJECT *NextOp; + const ACPI_OPCODE_INFO *OpInfo; + + + WalkState->Op = Op; + WalkState->Opcode = Op->Common.AmlOpcode; + WalkState->OpInfo = AcpiPsGetOpcodeInfo (Op->Common.AmlOpcode); + + DbgPrint (ASL_PARSE_OUTPUT, "[%.4d] Opcode: %12.12s ", + Op->Asl.LogicalLineNumber, Op->Asl.ParseOpName); + + /* + * These opcodes do not appear in the OpcodeInfo table, but + * they represent constants, so abort the constant walk now. + */ + if ((WalkState->Opcode == AML_RAW_DATA_BYTE) || + (WalkState->Opcode == AML_RAW_DATA_WORD) || + (WalkState->Opcode == AML_RAW_DATA_DWORD) || + (WalkState->Opcode == AML_RAW_DATA_QWORD)) + { + DbgPrint (ASL_PARSE_OUTPUT, "RAW DATA"); + Status = AE_TYPE; + goto CleanupAndExit; + } + + /* + * Search upwards for a possible Name() operator. This is done + * because a type 3/4/5 opcode within a Name() expression + * MUST be reduced to a simple constant. + */ + NextOp = Op->Asl.Parent; + while (NextOp) + { + /* Finished if we find a Name() opcode */ + + if (NextOp->Asl.AmlOpcode == AML_NAME_OP) + { + break; + } + + /* + * Any "deferred" opcodes contain one or more TermArg parameters, + * and thus are not required to be folded to constants at compile + * time. This affects things like Buffer() and Package() objects. + * We just ignore them here. However, any sub-expressions can and + * will still be typechecked. Note: These are called the + * "deferred" opcodes in the AML interpreter. + */ + OpInfo = AcpiPsGetOpcodeInfo (NextOp->Common.AmlOpcode); + if (OpInfo->Flags & AML_DEFER) + { + NextOp = NULL; + break; + } + + NextOp = NextOp->Asl.Parent; + } + + /* Type 3/4/5 opcodes have the AML_CONSTANT flag set */ + + if (!(WalkState->OpInfo->Flags & AML_CONSTANT)) + { + /* + * From the ACPI specification: + * + * "The Type 3/4/5 opcodes return a value and can be used in an + * expression that evaluates to a constant. These opcodes may be + * evaluated at ASL compile-time. To ensure that these opcodes + * will evaluate to a constant, the following rules apply: The + * term cannot have a destination (target) operand, and must have + * either a Type3Opcode, Type4Opcode, Type5Opcode, ConstExprTerm, + * Integer, BufferTerm, Package, or String for all arguments." + */ + + /* + * The value (second) operand for the Name() operator MUST + * reduce to a single constant, as per the ACPI specification + * (the operand is a DataObject). This also implies that there + * can be no target operand. Name() is the only ASL operator + * with a "DataObject" as an operand and is thus special- + * cased here. + */ + if (NextOp) /* Inspect a Name() operator */ + { + /* Error if there is a target operand */ + + if (Op->Asl.CompileFlags & OP_IS_TARGET) + { + AslError (ASL_ERROR, ASL_MSG_INVALID_TARGET, Op, NULL); + Status = AE_TYPE; + } + + /* Error if expression cannot be reduced (folded) */ + + if (!(NextOp->Asl.CompileFlags & OP_COULD_NOT_REDUCE)) + { + /* Ensure only one error message per statement */ + + NextOp->Asl.CompileFlags |= OP_COULD_NOT_REDUCE; + DbgPrint (ASL_PARSE_OUTPUT, + "**** Could not reduce operands for NAME opcode ****\n"); + + AslError (ASL_ERROR, ASL_MSG_CONSTANT_REQUIRED, Op, + "Constant is required for Name operator"); + Status = AE_TYPE; + } + } + + if (ACPI_FAILURE (Status)) + { + goto CleanupAndExit; + } + + /* This is not a 3/4/5 opcode, but maybe can convert to STORE */ + + if (Op->Asl.CompileFlags & OP_IS_TARGET) + { + DbgPrint (ASL_PARSE_OUTPUT, + "**** Valid Target, transform to Store or CopyObject ****\n"); + return (AE_CTRL_RETURN_VALUE); + } + + /* Expression cannot be reduced */ + + DbgPrint (ASL_PARSE_OUTPUT, + "**** Not a Type 3/4/5 opcode or cannot reduce/fold (%s) ****\n", + Op->Asl.ParseOpName); + + Status = AE_TYPE; + goto CleanupAndExit; + } + + /* + * TBD: Ignore buffer constants for now. The problem is that these + * constants have been transformed into RAW_DATA at this point, from + * the parse tree transform process which currently happens before + * the constant folding process. We may need to defer this transform + * for buffer until after the constant folding. + */ + if (WalkState->Opcode == AML_BUFFER_OP) + { + DbgPrint (ASL_PARSE_OUTPUT, + "\nBuffer constant reduction is currently not supported\n"); + + if (NextOp) /* Found a Name() operator, error */ + { + AslError (ASL_ERROR, ASL_MSG_UNSUPPORTED, Op, + "Buffer expression cannot be reduced"); + } + + Status = AE_TYPE; + goto CleanupAndExit; + } + + /* Debug output */ + + DbgPrint (ASL_PARSE_OUTPUT, "TYPE_345"); + + if (Op->Asl.CompileFlags & OP_IS_TARGET) + { + if (Op->Asl.ParseOpcode == PARSEOP_ZERO) + { + DbgPrint (ASL_PARSE_OUTPUT, "%-16s", " NULL TARGET"); + } + else + { + DbgPrint (ASL_PARSE_OUTPUT, "%-16s", " VALID TARGET"); + } + } + + if (Op->Asl.CompileFlags & OP_IS_TERM_ARG) + { + DbgPrint (ASL_PARSE_OUTPUT, "%-16s", " TERMARG"); + } + +CleanupAndExit: + + /* Dump the node compile flags also */ + + TrPrintOpFlags (Op->Asl.CompileFlags, ASL_PARSE_OUTPUT); + DbgPrint (ASL_PARSE_OUTPUT, "\n"); + return (Status); +} + + +/******************************************************************************* + * + * FUNCTION: TrSimpleConstantReduction + * + * PARAMETERS: Op - Parent operator to be transformed + * WalkState - Current walk state + * + * RETURN: Status + * + * DESCRIPTION: Reduce an entire AML operation to a single constant. The + * operation must not have a target operand. + * + * Add (32,64) --> 96 + * + ******************************************************************************/ + +static ACPI_STATUS +TrSimpleConstantReduction ( + ACPI_PARSE_OBJECT *Op, + ACPI_WALK_STATE *WalkState) +{ + ACPI_PARSE_OBJECT *RootOp; + ACPI_PARSE_OBJECT *OriginalParentOp; + ACPI_OPERAND_OBJECT *ObjDesc; + ACPI_STATUS Status; + + + DbgPrint (ASL_PARSE_OUTPUT, + "Simple subtree constant reduction, operator to constant\n"); + + /* Allocate a new temporary root for this subtree */ + + RootOp = TrAllocateOp (PARSEOP_INTEGER); + if (!RootOp) + { + return (AE_NO_MEMORY); + } + + RootOp->Common.AmlOpcode = AML_INT_EVAL_SUBTREE_OP; + + OriginalParentOp = Op->Common.Parent; + Op->Common.Parent = RootOp; + + /* Hand off the subtree to the AML interpreter */ + + WalkState->CallerReturnDesc = &ObjDesc; + + Status = TrWalkParseTree (Op, ASL_WALK_VISIT_TWICE, + OpcAmlEvaluationWalk1, OpcAmlEvaluationWalk2, WalkState); + + /* Restore original parse tree */ + + Op->Common.Parent = OriginalParentOp; + + if (ACPI_FAILURE (Status)) + { + DbgPrint (ASL_PARSE_OUTPUT, + "Constant Subtree evaluation(1), %s\n", + AcpiFormatException (Status)); + return (Status); + } + + /* Get the final result */ + + Status = AcpiDsResultPop (&ObjDesc, WalkState); + if (ACPI_FAILURE (Status)) + { + DbgPrint (ASL_PARSE_OUTPUT, + "Constant Subtree evaluation(2), %s\n", + AcpiFormatException (Status)); + return (Status); + } + + /* Disconnect any existing children, install new constant */ + + Op->Asl.Child = NULL; + TrInstallReducedConstant (Op, ObjDesc); + + UtSetParseOpName (Op); + return (AE_OK); +} + + +/******************************************************************************* + * + * FUNCTION: TrTransformToStoreOp + * + * PARAMETERS: Op - Parent operator to be transformed + * WalkState - Current walk state + * + * RETURN: Status + * + * DESCRIPTION: Transforms a single AML operation with a constant and target + * to a simple store operation: + * + * Add (32,64,DATA) --> Store (96,DATA) + * + ******************************************************************************/ + +static ACPI_STATUS +TrTransformToStoreOp ( + ACPI_PARSE_OBJECT *Op, + ACPI_WALK_STATE *WalkState) +{ + ACPI_PARSE_OBJECT *OriginalTarget; + ACPI_PARSE_OBJECT *NewTarget; + ACPI_PARSE_OBJECT *Child1; + ACPI_PARSE_OBJECT *Child2; + ACPI_OPERAND_OBJECT *ObjDesc; + ACPI_PARSE_OBJECT *NewParent; + ACPI_PARSE_OBJECT *OriginalParent; + ACPI_STATUS Status; + UINT16 NewParseOpcode; + UINT16 NewAmlOpcode; + + + /* Extract the operands */ + + Child1 = Op->Asl.Child; + Child2 = Child1->Asl.Next; + + /* + * Special case for DIVIDE -- it has two targets. The first + * is for the remainder and if present, we will not attempt + * to reduce the expression. + */ + if (Op->Asl.ParseOpcode == PARSEOP_DIVIDE) + { + Child2 = Child2->Asl.Next; + if (Child2->Asl.ParseOpcode != PARSEOP_ZERO) + { + DbgPrint (ASL_PARSE_OUTPUT, + "Cannot reduce DIVIDE - has two targets\n\n"); + return (AE_OK); + } + } + + switch (Op->Asl.ParseOpcode) + { + /* + * Folding of the explicit conversion opcodes must use CopyObject + * instead of Store. This can change the object type of the target + * operand, as per the ACPI specification: + * + * "If the ASL operator is one of the explicit conversion operators + * (ToString, ToInteger, etc., and the CopyObject operator), no + * [implicit] conversion is performed. (In other words, the result + * object is stored directly to the target and completely overwrites + * any existing object already stored at the target)" + */ + case PARSEOP_TOINTEGER: + case PARSEOP_TOSTRING: + case PARSEOP_TOBUFFER: + case PARSEOP_TODECIMALSTRING: + case PARSEOP_TOHEXSTRING: + case PARSEOP_TOBCD: + case PARSEOP_FROMBCD: + + NewParseOpcode = PARSEOP_COPYOBJECT; + NewAmlOpcode = AML_COPY_OBJECT_OP; + + DbgPrint (ASL_PARSE_OUTPUT, + "Reduction/Transform to CopyObjectOp: CopyObject(%s, %s)\n", + Child1->Asl.ParseOpName, Child2->Asl.ParseOpName); + break; + + default: + + NewParseOpcode = PARSEOP_STORE; + NewAmlOpcode = AML_STORE_OP; + + DbgPrint (ASL_PARSE_OUTPUT, + "Reduction/Transform to StoreOp: Store(%s, %s)\n", + Child1->Asl.ParseOpName, Child2->Asl.ParseOpName); + break; + } + + /* + * Create a NULL (zero) target so that we can use the + * interpreter to evaluate the expression. + */ + NewTarget = TrCreateNullTargetOp (); + NewTarget->Common.AmlOpcode = AML_INT_NAMEPATH_OP; + + /* Handle one-operand cases (NOT, TOBCD, etc.) */ + + if (!Child2->Asl.Next) + { + Child2 = Child1; + } + + /* Link in new NULL target as the last operand */ + + OriginalTarget = Child2->Asl.Next; + Child2->Asl.Next = NewTarget; + NewTarget->Asl.Parent = OriginalTarget->Asl.Parent; + + NewParent = TrAllocateOp (PARSEOP_INTEGER); + NewParent->Common.AmlOpcode = AML_INT_EVAL_SUBTREE_OP; + + OriginalParent = Op->Common.Parent; + Op->Common.Parent = NewParent; + + /* Hand off the subtree to the AML interpreter */ + + WalkState->CallerReturnDesc = &ObjDesc; + + Status = TrWalkParseTree (Op, ASL_WALK_VISIT_TWICE, + OpcAmlEvaluationWalk1, OpcAmlEvaluationWalk2, WalkState); + if (ACPI_FAILURE (Status)) + { + DbgPrint (ASL_PARSE_OUTPUT, + "Constant Subtree evaluation(3), %s\n", + AcpiFormatException (Status)); + goto EvalError; + } + + /* Get the final result */ + + Status = AcpiDsResultPop (&ObjDesc, WalkState); + if (ACPI_FAILURE (Status)) + { + DbgPrint (ASL_PARSE_OUTPUT, + "Constant Subtree evaluation(4), %s\n", + AcpiFormatException (Status)); + goto EvalError; + } + + /* Truncate any subtree expressions, they have been evaluated */ + + Child1->Asl.Child = NULL; + + /* Folded constant is in ObjDesc, store into Child1 */ + + TrInstallReducedConstant (Child1, ObjDesc); + + /* Convert operator to STORE or COPYOBJECT */ + + Op->Asl.ParseOpcode = NewParseOpcode; + Op->Asl.AmlOpcode = NewAmlOpcode; + UtSetParseOpName (Op); + Op->Common.Parent = OriginalParent; + + /* First child is the folded constant */ + + /* Second child will be the target */ + + Child1->Asl.Next = OriginalTarget; + return (AE_OK); + + +EvalError: + + /* Restore original links */ + + Op->Common.Parent = OriginalParent; + Child2->Asl.Next = OriginalTarget; + return (Status); +} + + +/******************************************************************************* + * + * FUNCTION: TrInstallReducedConstant + * + * PARAMETERS: Op - Parent operator to be transformed + * ObjDesc - Reduced constant to be installed + * + * RETURN: None + * + * DESCRIPTION: Transform the original operator to a simple constant. + * Handles Integers, Strings, and Buffers. + * + ******************************************************************************/ + +static void +TrInstallReducedConstant ( + ACPI_PARSE_OBJECT *Op, + ACPI_OPERAND_OBJECT *ObjDesc) +{ + ACPI_PARSE_OBJECT *LengthOp; + ACPI_PARSE_OBJECT *DataOp; + + + AslGbl_TotalFolds++; + AslError (ASL_OPTIMIZATION, ASL_MSG_CONSTANT_FOLDED, Op, + Op->Asl.ParseOpName); + + /* + * Because we know we executed type 3/4/5 opcodes above, we know that + * the result must be either an Integer, String, or Buffer. + */ + switch (ObjDesc->Common.Type) + { + case ACPI_TYPE_INTEGER: + + OpcUpdateIntegerNode (Op, ObjDesc->Integer.Value); + + DbgPrint (ASL_PARSE_OUTPUT, + "Constant expression reduced to (%s) %8.8X%8.8X\n\n", + Op->Asl.ParseOpName, + ACPI_FORMAT_UINT64 (Op->Common.Value.Integer)); + break; + + case ACPI_TYPE_STRING: + + Op->Asl.ParseOpcode = PARSEOP_STRING_LITERAL; + Op->Common.AmlOpcode = AML_STRING_OP; + Op->Asl.AmlLength = strlen (ObjDesc->String.Pointer) + 1; + Op->Common.Value.String = ObjDesc->String.Pointer; + + DbgPrint (ASL_PARSE_OUTPUT, + "Constant expression reduced to (STRING) %s\n\n", + Op->Common.Value.String); + break; + + case ACPI_TYPE_BUFFER: + /* + * Create a new parse subtree of the form: + * + * BUFFER (Buffer AML opcode) + * INTEGER (Buffer length in bytes) + * RAW_DATA (Buffer byte data) + */ + Op->Asl.ParseOpcode = PARSEOP_BUFFER; + Op->Common.AmlOpcode = AML_BUFFER_OP; + Op->Asl.CompileFlags = OP_AML_PACKAGE; + UtSetParseOpName (Op); + + /* Child node is the buffer length */ + + LengthOp = TrAllocateOp (PARSEOP_INTEGER); + + LengthOp->Asl.AmlOpcode = AML_DWORD_OP; + LengthOp->Asl.Value.Integer = ObjDesc->Buffer.Length; + LengthOp->Asl.Parent = Op; + (void) OpcSetOptimalIntegerSize (LengthOp); + + Op->Asl.Child = LengthOp; + + /* Next child is the raw buffer data */ + + DataOp = TrAllocateOp (PARSEOP_RAW_DATA); + DataOp->Asl.AmlOpcode = AML_RAW_DATA_BUFFER; + DataOp->Asl.AmlLength = ObjDesc->Buffer.Length; + DataOp->Asl.Value.String = (char *) ObjDesc->Buffer.Pointer; + DataOp->Asl.Parent = Op; + + LengthOp->Asl.Next = DataOp; + + DbgPrint (ASL_PARSE_OUTPUT, + "Constant expression reduced to (BUFFER) length %X\n\n", + ObjDesc->Buffer.Length); + break; + + default: + break; + } +} + + +/******************************************************************************* + * + * FUNCTION: OpcUpdateIntegerNode + * + * PARAMETERS: Op - Current parse object + * Value - Value for the integer op + * + * RETURN: None + * + * DESCRIPTION: Update node to the correct Integer type and value + * + ******************************************************************************/ + +static void +OpcUpdateIntegerNode ( + ACPI_PARSE_OBJECT *Op, + UINT64 Value) +{ + + Op->Common.Value.Integer = Value; + + /* + * The AmlLength is used by the parser to indicate a constant, + * (if non-zero). Length is either (1/2/4/8) + */ + switch (Op->Asl.AmlLength) + { + case 1: + + TrSetOpIntegerValue (PARSEOP_BYTECONST, Op); + Op->Asl.AmlOpcode = AML_RAW_DATA_BYTE; + break; + + case 2: + + TrSetOpIntegerValue (PARSEOP_WORDCONST, Op); + Op->Asl.AmlOpcode = AML_RAW_DATA_WORD; + break; + + case 4: + + TrSetOpIntegerValue (PARSEOP_DWORDCONST, Op); + Op->Asl.AmlOpcode = AML_RAW_DATA_DWORD; + break; + + case 8: + + TrSetOpIntegerValue (PARSEOP_QWORDCONST, Op); + Op->Asl.AmlOpcode = AML_RAW_DATA_QWORD; + break; + + case 0: + default: + + OpcSetOptimalIntegerSize (Op); + TrSetOpIntegerValue (PARSEOP_INTEGER, Op); + break; + } + + Op->Asl.AmlLength = 0; +} + + +/******************************************************************************* + * + * FUNCTION: OpcAmlEvaluationWalk1 + * + * PARAMETERS: ASL_WALK_CALLBACK + * + * RETURN: Status + * + * DESCRIPTION: Descending callback for AML execution of constant subtrees + * + ******************************************************************************/ + +static ACPI_STATUS +OpcAmlEvaluationWalk1 ( + ACPI_PARSE_OBJECT *Op, + UINT32 Level, + void *Context) +{ + ACPI_WALK_STATE *WalkState = Context; + ACPI_STATUS Status; + ACPI_PARSE_OBJECT *OutOp; + + + WalkState->Op = Op; + WalkState->Opcode = Op->Common.AmlOpcode; + WalkState->OpInfo = AcpiPsGetOpcodeInfo (Op->Common.AmlOpcode); + + /* Copy child pointer to Arg for compatibility with Interpreter */ + + if (Op->Asl.Child) + { + Op->Common.Value.Arg = Op->Asl.Child; + } + + /* Call AML dispatcher */ + + Status = AcpiDsExecBeginOp (WalkState, &OutOp); + if (ACPI_FAILURE (Status)) + { + DbgPrint (ASL_PARSE_OUTPUT, + "%s Constant interpretation failed (1) - %s\n", + Op->Asl.ParseOpName, AcpiFormatException (Status)); + } + + return (Status); +} + + +/******************************************************************************* + * + * FUNCTION: OpcAmlEvaluationWalk2 + * + * PARAMETERS: ASL_WALK_CALLBACK + * + * RETURN: Status + * + * DESCRIPTION: Ascending callback for AML execution of constant subtrees + * + ******************************************************************************/ + +static ACPI_STATUS +OpcAmlEvaluationWalk2 ( + ACPI_PARSE_OBJECT *Op, + UINT32 Level, + void *Context) +{ + ACPI_WALK_STATE *WalkState = Context; + ACPI_STATUS Status; + + + WalkState->Op = Op; + WalkState->Opcode = Op->Common.AmlOpcode; + WalkState->OpInfo = AcpiPsGetOpcodeInfo (Op->Common.AmlOpcode); + + /* Copy child pointer to Arg for compatibility with Interpreter */ + + if (Op->Asl.Child) + { + Op->Common.Value.Arg = Op->Asl.Child; + } + + /* Call AML dispatcher */ + + Status = AcpiDsExecEndOp (WalkState); + if (ACPI_FAILURE (Status)) + { + DbgPrint (ASL_PARSE_OUTPUT, + "%s: Constant interpretation failed (2) - %s\n", + Op->Asl.ParseOpName, AcpiFormatException (Status)); + } + + return (Status); +} |