diff options
Diffstat (limited to 'usr/src/common/acpica/dispatcher/dsutils.c')
| -rw-r--r-- | usr/src/common/acpica/dispatcher/dsutils.c | 953 |
1 files changed, 953 insertions, 0 deletions
diff --git a/usr/src/common/acpica/dispatcher/dsutils.c b/usr/src/common/acpica/dispatcher/dsutils.c new file mode 100644 index 0000000000..e294c836e0 --- /dev/null +++ b/usr/src/common/acpica/dispatcher/dsutils.c @@ -0,0 +1,953 @@ +/******************************************************************************* + * + * Module Name: dsutils - Dispatcher utilities + * + ******************************************************************************/ + +/* + * Copyright (C) 2000 - 2016, 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.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 ("dsutils") + + +/******************************************************************************* + * + * FUNCTION: AcpiDsClearImplicitReturn + * + * PARAMETERS: WalkState - Current State + * + * RETURN: None. + * + * DESCRIPTION: Clear and remove a reference on an implicit return value. Used + * to delete "stale" return values (if enabled, the return value + * from every operator is saved at least momentarily, in case the + * parent method exits.) + * + ******************************************************************************/ + +void +AcpiDsClearImplicitReturn ( + ACPI_WALK_STATE *WalkState) +{ + ACPI_FUNCTION_NAME (DsClearImplicitReturn); + + + /* + * Slack must be enabled for this feature + */ + if (!AcpiGbl_EnableInterpreterSlack) + { + return; + } + + if (WalkState->ImplicitReturnObj) + { + /* + * Delete any "stale" implicit return. However, in + * complex statements, the implicit return value can be + * bubbled up several levels. + */ + ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH, + "Removing reference on stale implicit return obj %p\n", + WalkState->ImplicitReturnObj)); + + AcpiUtRemoveReference (WalkState->ImplicitReturnObj); + WalkState->ImplicitReturnObj = NULL; + } +} + + +#ifndef ACPI_NO_METHOD_EXECUTION +/******************************************************************************* + * + * FUNCTION: AcpiDsDoImplicitReturn + * + * PARAMETERS: ReturnDesc - The return value + * WalkState - Current State + * AddReference - True if a reference should be added to the + * return object + * + * RETURN: TRUE if implicit return enabled, FALSE otherwise + * + * DESCRIPTION: Implements the optional "implicit return". We save the result + * of every ASL operator and control method invocation in case the + * parent method exit. Before storing a new return value, we + * delete the previous return value. + * + ******************************************************************************/ + +BOOLEAN +AcpiDsDoImplicitReturn ( + ACPI_OPERAND_OBJECT *ReturnDesc, + ACPI_WALK_STATE *WalkState, + BOOLEAN AddReference) +{ + ACPI_FUNCTION_NAME (DsDoImplicitReturn); + + + /* + * Slack must be enabled for this feature, and we must + * have a valid return object + */ + if ((!AcpiGbl_EnableInterpreterSlack) || + (!ReturnDesc)) + { + return (FALSE); + } + + ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH, + "Result %p will be implicitly returned; Prev=%p\n", + ReturnDesc, + WalkState->ImplicitReturnObj)); + + /* + * Delete any "stale" implicit return value first. However, in + * complex statements, the implicit return value can be + * bubbled up several levels, so we don't clear the value if it + * is the same as the ReturnDesc. + */ + if (WalkState->ImplicitReturnObj) + { + if (WalkState->ImplicitReturnObj == ReturnDesc) + { + return (TRUE); + } + AcpiDsClearImplicitReturn (WalkState); + } + + /* Save the implicit return value, add a reference if requested */ + + WalkState->ImplicitReturnObj = ReturnDesc; + if (AddReference) + { + AcpiUtAddReference (ReturnDesc); + } + + return (TRUE); +} + + +/******************************************************************************* + * + * FUNCTION: AcpiDsIsResultUsed + * + * PARAMETERS: Op - Current Op + * WalkState - Current State + * + * RETURN: TRUE if result is used, FALSE otherwise + * + * DESCRIPTION: Check if a result object will be used by the parent + * + ******************************************************************************/ + +BOOLEAN +AcpiDsIsResultUsed ( + ACPI_PARSE_OBJECT *Op, + ACPI_WALK_STATE *WalkState) +{ + const ACPI_OPCODE_INFO *ParentInfo; + + ACPI_FUNCTION_TRACE_PTR (DsIsResultUsed, Op); + + + /* Must have both an Op and a Result Object */ + + if (!Op) + { + ACPI_ERROR ((AE_INFO, "Null Op")); + return_UINT8 (TRUE); + } + + /* + * We know that this operator is not a + * Return() operator (would not come here.) The following code is the + * optional support for a so-called "implicit return". Some AML code + * assumes that the last value of the method is "implicitly" returned + * to the caller. Just save the last result as the return value. + * NOTE: this is optional because the ASL language does not actually + * support this behavior. + */ + (void) AcpiDsDoImplicitReturn (WalkState->ResultObj, WalkState, TRUE); + + /* + * Now determine if the parent will use the result + * + * If there is no parent, or the parent is a ScopeOp, we are executing + * at the method level. An executing method typically has no parent, + * since each method is parsed separately. A method invoked externally + * via ExecuteControlMethod has a ScopeOp as the parent. + */ + if ((!Op->Common.Parent) || + (Op->Common.Parent->Common.AmlOpcode == AML_SCOPE_OP)) + { + /* No parent, the return value cannot possibly be used */ + + ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH, + "At Method level, result of [%s] not used\n", + AcpiPsGetOpcodeName (Op->Common.AmlOpcode))); + return_UINT8 (FALSE); + } + + /* Get info on the parent. The RootOp is AML_SCOPE */ + + ParentInfo = AcpiPsGetOpcodeInfo (Op->Common.Parent->Common.AmlOpcode); + if (ParentInfo->Class == AML_CLASS_UNKNOWN) + { + ACPI_ERROR ((AE_INFO, + "Unknown parent opcode Op=%p", Op)); + return_UINT8 (FALSE); + } + + /* + * Decide what to do with the result based on the parent. If + * the parent opcode will not use the result, delete the object. + * Otherwise leave it as is, it will be deleted when it is used + * as an operand later. + */ + switch (ParentInfo->Class) + { + case AML_CLASS_CONTROL: + + switch (Op->Common.Parent->Common.AmlOpcode) + { + case AML_RETURN_OP: + + /* Never delete the return value associated with a return opcode */ + + goto ResultUsed; + + case AML_IF_OP: + case AML_WHILE_OP: + /* + * If we are executing the predicate AND this is the predicate op, + * we will use the return value + */ + if ((WalkState->ControlState->Common.State == + ACPI_CONTROL_PREDICATE_EXECUTING) && + (WalkState->ControlState->Control.PredicateOp == Op)) + { + goto ResultUsed; + } + break; + + default: + + /* Ignore other control opcodes */ + + break; + } + + /* The general control opcode returns no result */ + + goto ResultNotUsed; + + case AML_CLASS_CREATE: + /* + * These opcodes allow TermArg(s) as operands and therefore + * the operands can be method calls. The result is used. + */ + goto ResultUsed; + + case AML_CLASS_NAMED_OBJECT: + + if ((Op->Common.Parent->Common.AmlOpcode == AML_REGION_OP) || + (Op->Common.Parent->Common.AmlOpcode == AML_DATA_REGION_OP) || + (Op->Common.Parent->Common.AmlOpcode == AML_PACKAGE_OP) || + (Op->Common.Parent->Common.AmlOpcode == AML_VAR_PACKAGE_OP) || + (Op->Common.Parent->Common.AmlOpcode == AML_BUFFER_OP) || + (Op->Common.Parent->Common.AmlOpcode == AML_INT_EVAL_SUBTREE_OP) || + (Op->Common.Parent->Common.AmlOpcode == AML_BANK_FIELD_OP)) + { + /* + * These opcodes allow TermArg(s) as operands and therefore + * the operands can be method calls. The result is used. + */ + goto ResultUsed; + } + + goto ResultNotUsed; + + default: + /* + * In all other cases. the parent will actually use the return + * object, so keep it. + */ + goto ResultUsed; + } + + +ResultUsed: + ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH, + "Result of [%s] used by Parent [%s] Op=%p\n", + AcpiPsGetOpcodeName (Op->Common.AmlOpcode), + AcpiPsGetOpcodeName (Op->Common.Parent->Common.AmlOpcode), Op)); + + return_UINT8 (TRUE); + + +ResultNotUsed: + ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH, + "Result of [%s] not used by Parent [%s] Op=%p\n", + AcpiPsGetOpcodeName (Op->Common.AmlOpcode), + AcpiPsGetOpcodeName (Op->Common.Parent->Common.AmlOpcode), Op)); + + return_UINT8 (FALSE); +} + + +/******************************************************************************* + * + * FUNCTION: AcpiDsDeleteResultIfNotUsed + * + * PARAMETERS: Op - Current parse Op + * ResultObj - Result of the operation + * WalkState - Current state + * + * RETURN: Status + * + * DESCRIPTION: Used after interpretation of an opcode. If there is an internal + * result descriptor, check if the parent opcode will actually use + * this result. If not, delete the result now so that it will + * not become orphaned. + * + ******************************************************************************/ + +void +AcpiDsDeleteResultIfNotUsed ( + ACPI_PARSE_OBJECT *Op, + ACPI_OPERAND_OBJECT *ResultObj, + ACPI_WALK_STATE *WalkState) +{ + ACPI_OPERAND_OBJECT *ObjDesc; + ACPI_STATUS Status; + + + ACPI_FUNCTION_TRACE_PTR (DsDeleteResultIfNotUsed, ResultObj); + + + if (!Op) + { + ACPI_ERROR ((AE_INFO, "Null Op")); + return_VOID; + } + + if (!ResultObj) + { + return_VOID; + } + + if (!AcpiDsIsResultUsed (Op, WalkState)) + { + /* Must pop the result stack (ObjDesc should be equal to ResultObj) */ + + Status = AcpiDsResultPop (&ObjDesc, WalkState); + if (ACPI_SUCCESS (Status)) + { + AcpiUtRemoveReference (ResultObj); + } + } + + return_VOID; +} + + +/******************************************************************************* + * + * FUNCTION: AcpiDsResolveOperands + * + * PARAMETERS: WalkState - Current walk state with operands on stack + * + * RETURN: Status + * + * DESCRIPTION: Resolve all operands to their values. Used to prepare + * arguments to a control method invocation (a call from one + * method to another.) + * + ******************************************************************************/ + +ACPI_STATUS +AcpiDsResolveOperands ( + ACPI_WALK_STATE *WalkState) +{ + UINT32 i; + ACPI_STATUS Status = AE_OK; + + + ACPI_FUNCTION_TRACE_PTR (DsResolveOperands, WalkState); + + + /* + * Attempt to resolve each of the valid operands + * Method arguments are passed by reference, not by value. This means + * that the actual objects are passed, not copies of the objects. + */ + for (i = 0; i < WalkState->NumOperands; i++) + { + Status = AcpiExResolveToValue (&WalkState->Operands[i], WalkState); + if (ACPI_FAILURE (Status)) + { + break; + } + } + + return_ACPI_STATUS (Status); +} + + +/******************************************************************************* + * + * FUNCTION: AcpiDsClearOperands + * + * PARAMETERS: WalkState - Current walk state with operands on stack + * + * RETURN: None + * + * DESCRIPTION: Clear all operands on the current walk state operand stack. + * + ******************************************************************************/ + +void +AcpiDsClearOperands ( + ACPI_WALK_STATE *WalkState) +{ + UINT32 i; + + + ACPI_FUNCTION_TRACE_PTR (DsClearOperands, WalkState); + + + /* Remove a reference on each operand on the stack */ + + for (i = 0; i < WalkState->NumOperands; i++) + { + /* + * Remove a reference to all operands, including both + * "Arguments" and "Targets". + */ + AcpiUtRemoveReference (WalkState->Operands[i]); + WalkState->Operands[i] = NULL; + } + + WalkState->NumOperands = 0; + return_VOID; +} +#endif + + +/******************************************************************************* + * + * FUNCTION: AcpiDsCreateOperand + * + * PARAMETERS: WalkState - Current walk state + * Arg - Parse object for the argument + * ArgIndex - Which argument (zero based) + * + * RETURN: Status + * + * DESCRIPTION: Translate a parse tree object that is an argument to an AML + * opcode to the equivalent interpreter object. This may include + * looking up a name or entering a new name into the internal + * namespace. + * + ******************************************************************************/ + +ACPI_STATUS +AcpiDsCreateOperand ( + ACPI_WALK_STATE *WalkState, + ACPI_PARSE_OBJECT *Arg, + UINT32 ArgIndex) +{ + ACPI_STATUS Status = AE_OK; + char *NameString; + UINT32 NameLength; + ACPI_OPERAND_OBJECT *ObjDesc; + ACPI_PARSE_OBJECT *ParentOp; + UINT16 Opcode; + ACPI_INTERPRETER_MODE InterpreterMode; + const ACPI_OPCODE_INFO *OpInfo; + + + ACPI_FUNCTION_TRACE_PTR (DsCreateOperand, Arg); + + + /* A valid name must be looked up in the namespace */ + + if ((Arg->Common.AmlOpcode == AML_INT_NAMEPATH_OP) && + (Arg->Common.Value.String) && + !(Arg->Common.Flags & ACPI_PARSEOP_IN_STACK)) + { + ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH, "Getting a name: Arg=%p\n", Arg)); + + /* Get the entire name string from the AML stream */ + + Status = AcpiExGetNameString (ACPI_TYPE_ANY, + Arg->Common.Value.Buffer, &NameString, &NameLength); + + if (ACPI_FAILURE (Status)) + { + return_ACPI_STATUS (Status); + } + + /* All prefixes have been handled, and the name is in NameString */ + + /* + * Special handling for BufferField declarations. This is a deferred + * opcode that unfortunately defines the field name as the last + * parameter instead of the first. We get here when we are performing + * the deferred execution, so the actual name of the field is already + * in the namespace. We don't want to attempt to look it up again + * because we may be executing in a different scope than where the + * actual opcode exists. + */ + if ((WalkState->DeferredNode) && + (WalkState->DeferredNode->Type == ACPI_TYPE_BUFFER_FIELD) && + (ArgIndex == (UINT32) + ((WalkState->Opcode == AML_CREATE_FIELD_OP) ? 3 : 2))) + { + ObjDesc = ACPI_CAST_PTR ( + ACPI_OPERAND_OBJECT, WalkState->DeferredNode); + Status = AE_OK; + } + else /* All other opcodes */ + { + /* + * Differentiate between a namespace "create" operation + * versus a "lookup" operation (IMODE_LOAD_PASS2 vs. + * IMODE_EXECUTE) in order to support the creation of + * namespace objects during the execution of control methods. + */ + ParentOp = Arg->Common.Parent; + OpInfo = AcpiPsGetOpcodeInfo (ParentOp->Common.AmlOpcode); + + if ((OpInfo->Flags & AML_NSNODE) && + (ParentOp->Common.AmlOpcode != AML_INT_METHODCALL_OP) && + (ParentOp->Common.AmlOpcode != AML_REGION_OP) && + (ParentOp->Common.AmlOpcode != AML_INT_NAMEPATH_OP)) + { + /* Enter name into namespace if not found */ + + InterpreterMode = ACPI_IMODE_LOAD_PASS2; + } + else + { + /* Return a failure if name not found */ + + InterpreterMode = ACPI_IMODE_EXECUTE; + } + + Status = AcpiNsLookup (WalkState->ScopeInfo, NameString, + ACPI_TYPE_ANY, InterpreterMode, + ACPI_NS_SEARCH_PARENT | ACPI_NS_DONT_OPEN_SCOPE, WalkState, + ACPI_CAST_INDIRECT_PTR (ACPI_NAMESPACE_NODE, &ObjDesc)); + /* + * The only case where we pass through (ignore) a NOT_FOUND + * error is for the CondRefOf opcode. + */ + if (Status == AE_NOT_FOUND) + { + if (ParentOp->Common.AmlOpcode == AML_COND_REF_OF_OP) + { + /* + * For the Conditional Reference op, it's OK if + * the name is not found; We just need a way to + * indicate this to the interpreter, set the + * object to the root + */ + ObjDesc = ACPI_CAST_PTR ( + ACPI_OPERAND_OBJECT, AcpiGbl_RootNode); + Status = AE_OK; + } + else if (ParentOp->Common.AmlOpcode == AML_EXTERNAL_OP) + { + /* + * This opcode should never appear here. It is used only + * by AML disassemblers and is surrounded by an If(0) + * by the ASL compiler. + * + * Therefore, if we see it here, it is a serious error. + */ + Status = AE_AML_BAD_OPCODE; + } + else + { + /* + * We just plain didn't find it -- which is a + * very serious error at this point + */ + Status = AE_AML_NAME_NOT_FOUND; + } + } + + if (ACPI_FAILURE (Status)) + { + ACPI_ERROR_NAMESPACE (NameString, Status); + } + } + + /* Free the namestring created above */ + + ACPI_FREE (NameString); + + /* Check status from the lookup */ + + if (ACPI_FAILURE (Status)) + { + return_ACPI_STATUS (Status); + } + + /* Put the resulting object onto the current object stack */ + + Status = AcpiDsObjStackPush (ObjDesc, WalkState); + if (ACPI_FAILURE (Status)) + { + return_ACPI_STATUS (Status); + } + +#ifdef ACPI_DEBUGGER + AcpiDbDisplayArgumentObject (ObjDesc, WalkState); +#endif + } + else + { + /* Check for null name case */ + + if ((Arg->Common.AmlOpcode == AML_INT_NAMEPATH_OP) && + !(Arg->Common.Flags & ACPI_PARSEOP_IN_STACK)) + { + /* + * If the name is null, this means that this is an + * optional result parameter that was not specified + * in the original ASL. Create a Zero Constant for a + * placeholder. (Store to a constant is a Noop.) + */ + Opcode = AML_ZERO_OP; /* Has no arguments! */ + + ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH, + "Null namepath: Arg=%p\n", Arg)); + } + else + { + Opcode = Arg->Common.AmlOpcode; + } + + /* Get the object type of the argument */ + + OpInfo = AcpiPsGetOpcodeInfo (Opcode); + if (OpInfo->ObjectType == ACPI_TYPE_INVALID) + { + return_ACPI_STATUS (AE_NOT_IMPLEMENTED); + } + + if ((OpInfo->Flags & AML_HAS_RETVAL) || + (Arg->Common.Flags & ACPI_PARSEOP_IN_STACK)) + { + ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH, + "Argument previously created, already stacked\n")); + +#ifdef ACPI_DEBUGGER + AcpiDbDisplayArgumentObject ( + WalkState->Operands [WalkState->NumOperands - 1], WalkState); +#endif + + /* + * Use value that was already previously returned + * by the evaluation of this argument + */ + Status = AcpiDsResultPop (&ObjDesc, WalkState); + if (ACPI_FAILURE (Status)) + { + /* + * Only error is underflow, and this indicates + * a missing or null operand! + */ + ACPI_EXCEPTION ((AE_INFO, Status, + "Missing or null operand")); + return_ACPI_STATUS (Status); + } + } + else + { + /* Create an ACPI_INTERNAL_OBJECT for the argument */ + + ObjDesc = AcpiUtCreateInternalObject (OpInfo->ObjectType); + if (!ObjDesc) + { + return_ACPI_STATUS (AE_NO_MEMORY); + } + + /* Initialize the new object */ + + Status = AcpiDsInitObjectFromOp ( + WalkState, Arg, Opcode, &ObjDesc); + if (ACPI_FAILURE (Status)) + { + AcpiUtDeleteObjectDesc (ObjDesc); + return_ACPI_STATUS (Status); + } + } + + /* Put the operand object on the object stack */ + + Status = AcpiDsObjStackPush (ObjDesc, WalkState); + if (ACPI_FAILURE (Status)) + { + return_ACPI_STATUS (Status); + } + +#ifdef ACPI_DEBUGGER + AcpiDbDisplayArgumentObject (ObjDesc, WalkState); +#endif + } + + return_ACPI_STATUS (AE_OK); +} + + +/******************************************************************************* + * + * FUNCTION: AcpiDsCreateOperands + * + * PARAMETERS: WalkState - Current state + * FirstArg - First argument of a parser argument tree + * + * RETURN: Status + * + * DESCRIPTION: Convert an operator's arguments from a parse tree format to + * namespace objects and place those argument object on the object + * stack in preparation for evaluation by the interpreter. + * + ******************************************************************************/ + +ACPI_STATUS +AcpiDsCreateOperands ( + ACPI_WALK_STATE *WalkState, + ACPI_PARSE_OBJECT *FirstArg) +{ + ACPI_STATUS Status = AE_OK; + ACPI_PARSE_OBJECT *Arg; + ACPI_PARSE_OBJECT *Arguments[ACPI_OBJ_NUM_OPERANDS]; + UINT32 ArgCount = 0; + UINT32 Index = WalkState->NumOperands; + UINT32 i; + + + ACPI_FUNCTION_TRACE_PTR (DsCreateOperands, FirstArg); + + + /* Get all arguments in the list */ + + Arg = FirstArg; + while (Arg) + { + if (Index >= ACPI_OBJ_NUM_OPERANDS) + { + return_ACPI_STATUS (AE_BAD_DATA); + } + + Arguments[Index] = Arg; + WalkState->Operands [Index] = NULL; + + /* Move on to next argument, if any */ + + Arg = Arg->Common.Next; + ArgCount++; + Index++; + } + + ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH, + "NumOperands %d, ArgCount %d, Index %d\n", + WalkState->NumOperands, ArgCount, Index)); + + /* Create the interpreter arguments, in reverse order */ + + Index--; + for (i = 0; i < ArgCount; i++) + { + Arg = Arguments[Index]; + WalkState->OperandIndex = (UINT8) Index; + + Status = AcpiDsCreateOperand (WalkState, Arg, Index); + if (ACPI_FAILURE (Status)) + { + goto Cleanup; + } + + ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH, + "Created Arg #%u (%p) %u args total\n", + Index, Arg, ArgCount)); + Index--; + } + + return_ACPI_STATUS (Status); + + +Cleanup: + /* + * We must undo everything done above; meaning that we must + * pop everything off of the operand stack and delete those + * objects + */ + AcpiDsObjStackPopAndDelete (ArgCount, WalkState); + + ACPI_EXCEPTION ((AE_INFO, Status, "While creating Arg %u", Index)); + return_ACPI_STATUS (Status); +} + + +/***************************************************************************** + * + * FUNCTION: AcpiDsEvaluateNamePath + * + * PARAMETERS: WalkState - Current state of the parse tree walk, + * the opcode of current operation should be + * AML_INT_NAMEPATH_OP + * + * RETURN: Status + * + * DESCRIPTION: Translate the -NamePath- parse tree object to the equivalent + * interpreter object, convert it to value, if needed, duplicate + * it, if needed, and push it onto the current result stack. + * + ****************************************************************************/ + +ACPI_STATUS +AcpiDsEvaluateNamePath ( + ACPI_WALK_STATE *WalkState) +{ + ACPI_STATUS Status = AE_OK; + ACPI_PARSE_OBJECT *Op = WalkState->Op; + ACPI_OPERAND_OBJECT **Operand = &WalkState->Operands[0]; + ACPI_OPERAND_OBJECT *NewObjDesc; + UINT8 Type; + + + ACPI_FUNCTION_TRACE_PTR (DsEvaluateNamePath, WalkState); + + + if (!Op->Common.Parent) + { + /* This happens after certain exception processing */ + + goto Exit; + } + + if ((Op->Common.Parent->Common.AmlOpcode == AML_PACKAGE_OP) || + (Op->Common.Parent->Common.AmlOpcode == AML_VAR_PACKAGE_OP) || + (Op->Common.Parent->Common.AmlOpcode == AML_REF_OF_OP)) + { + /* TBD: Should we specify this feature as a bit of OpInfo->Flags of these opcodes? */ + + goto Exit; + } + + Status = AcpiDsCreateOperand (WalkState, Op, 0); + if (ACPI_FAILURE (Status)) + { + goto Exit; + } + + if (Op->Common.Flags & ACPI_PARSEOP_TARGET) + { + NewObjDesc = *Operand; + goto PushResult; + } + + Type = (*Operand)->Common.Type; + + Status = AcpiExResolveToValue (Operand, WalkState); + if (ACPI_FAILURE (Status)) + { + goto Exit; + } + + if (Type == ACPI_TYPE_INTEGER) + { + /* It was incremented by AcpiExResolveToValue */ + + AcpiUtRemoveReference (*Operand); + + Status = AcpiUtCopyIobjectToIobject ( + *Operand, &NewObjDesc, WalkState); + if (ACPI_FAILURE (Status)) + { + goto Exit; + } + } + else + { + /* + * The object either was anew created or is + * a Namespace node - don't decrement it. + */ + NewObjDesc = *Operand; + } + + /* Cleanup for name-path operand */ + + Status = AcpiDsObjStackPop (1, WalkState); + if (ACPI_FAILURE (Status)) + { + WalkState->ResultObj = NewObjDesc; + goto Exit; + } + +PushResult: + + WalkState->ResultObj = NewObjDesc; + + Status = AcpiDsResultPush (WalkState->ResultObj, WalkState); + if (ACPI_SUCCESS (Status)) + { + /* Force to take it from stack */ + + Op->Common.Flags |= ACPI_PARSEOP_IN_STACK; + } + +Exit: + + return_ACPI_STATUS (Status); +} |