aslmethod.c revision 199767f8919635c4928607450d9e0abb932109ce
/******************************************************************************
*
* Module Name: aslmethod.c - Control method analysis walk
*
*****************************************************************************/
/*
* 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 "aslcompiler.y.h"
#define _COMPONENT ACPI_COMPILER
ACPI_MODULE_NAME ("aslmethod")
/* Local prototypes */
void
/*******************************************************************************
*
* FUNCTION: MtMethodAnalysisWalkBegin
*
* PARAMETERS: ASL_WALK_CALLBACK
*
* RETURN: Status
*
* DESCRIPTION: Descending callback for the analysis walk. Check methods for:
* 1) Initialized local variables
* 2) Valid arguments
* 3) Return types
*
******************************************************************************/
void *Context)
{
UINT32 i;
char LocalName[] = "Local0";
char ArgName[] = "Arg0";
UINT8 ActualArgs = 0;
{
case PARSEOP_METHOD:
TotalMethods++;
/* Create and init method info */
/*
* Special handling for _PSx methods. Dependency rules (same scope):
*
* 1) _PS0 - One of these must exist: _PS1, _PS2, _PS3
* 2) _PS1/_PS2/_PS3: A _PS0 must exist
*/
{
/* For _PS0, one of _PS1/_PS2/_PS3 must exist */
{
"_PS0 requires one of _PS1/_PS2/_PS3 in same scope");
}
}
else if (
{
/* For _PS1/_PS2/_PS3, a _PS0 must exist */
{
}
}
/* Get the name node */
/* Get the NumArguments node */
/* Get the SerializeRule and SyncLevel nodes, ignored here */
/* Get the ReturnType node */
while (NextType)
{
/* Get and map each of the ReturnTypes */
}
/* Get the ParameterType node */
while (NextType)
{
{
while (NextParamType)
{
}
}
else
{
ActualArgs++;
}
}
if ((MethodInfo->NumArguments) &&
{
/* error: Param list did not match number of args */
}
/* Allow numarguments == 0 for Function() */
{
}
/*
* Actual arguments are initialized at method entry.
* All other ArgX "registers" can be used as locals, so we
* track their initialization.
*/
for (i = 0; i < MethodInfo->NumArguments; i++)
{
}
break;
case PARSEOP_METHODCALL:
if (MethodInfo &&
{
}
break;
case PARSEOP_LOCAL0:
case PARSEOP_LOCAL1:
case PARSEOP_LOCAL2:
case PARSEOP_LOCAL3:
case PARSEOP_LOCAL4:
case PARSEOP_LOCAL5:
case PARSEOP_LOCAL6:
case PARSEOP_LOCAL7:
if (!MethodInfo)
{
/*
* Local was used outside a control method, or there was an error
* in the method declaration.
*/
return (AE_ERROR);
}
/*
* If the local is being used as a target, mark the local
* initialized
*/
{
}
/*
* Otherwise, this is a reference, check if the local
* has been previously initialized.
*
* The only operator that accepts an uninitialized value is ObjectType()
*/
{
}
break;
case PARSEOP_ARG0:
case PARSEOP_ARG1:
case PARSEOP_ARG2:
case PARSEOP_ARG3:
case PARSEOP_ARG4:
case PARSEOP_ARG5:
case PARSEOP_ARG6:
if (!MethodInfo)
{
/*
* Arg was used outside a control method, or there was an error
* in the method declaration.
*/
return (AE_ERROR);
}
/*
* If the Arg is being used as a target, mark the local
* initialized
*/
{
}
/*
* Otherwise, this is a reference, check if the Arg
* has been previously initialized.
*
* The only operator that accepts an uninitialized value is ObjectType()
*/
{
}
/* Flag this arg if it is not a "real" argument to the method */
{
}
break;
case PARSEOP_RETURN:
if (!MethodInfo)
{
/*
* Probably was an error in the method declaration,
* no additional error here
*/
return (AE_ERROR);
}
/*
* A child indicates a possible return value. A simple Return or
* Return() is marked with NODE_IS_NULL_RETURN by the parser so
* that it is not counted as a "real" return-with-value, although
* the AML code that is actually emitted is Return(0). The AML
* definition of Return has a required parameter, so we are
* forced to convert a null return to Return(0).
*/
{
}
else
{
}
break;
case PARSEOP_BREAK:
case PARSEOP_CONTINUE:
while (Next)
{
{
break;
}
}
if (!Next)
{
}
break;
case PARSEOP_STALL:
/* We can range check if the argument is an integer */
{
}
break;
case PARSEOP_DEVICE:
{
"Device object requires a _HID or _ADR in same scope");
}
break;
case PARSEOP_EVENT:
case PARSEOP_MUTEX:
case PARSEOP_OPERATIONREGION:
case PARSEOP_POWERRESOURCE:
case PARSEOP_PROCESSOR:
case PARSEOP_THERMALZONE:
/*
* The first operand is a name to be created in the namespace.
* Check against the reserved list.
*/
if (i < ACPI_VALID_RESERVED_NAME_MAX)
{
}
break;
case PARSEOP_NAME:
/* Typecheck any predefined names statically defined with Name() */
/* Special typechecking for _HID */
{
}
/* Special typechecking for _CID */
{
{
while (Next)
{
}
}
else
{
}
}
break;
default:
break;
}
/* Check for named object creation within a non-serialized method */
return (AE_OK);
}
/*******************************************************************************
*
* FUNCTION: MtCheckNamedObjectInMethod
*
* PARAMETERS: Op - Current parser op
* MethodInfo - Info for method being parsed
*
* RETURN: None
*
* DESCRIPTION: Detect if a non-serialized method is creating a named object,
* which could possibly cause problems if two threads execute
* the method concurrently. Emit a remark in this case.
*
******************************************************************************/
void
{
const ACPI_OPCODE_INFO *OpInfo;
/* We don't care about actual method declarations */
{
return;
}
/* Determine if we are creating a named object */
{
/*
* If we have a named object created within a non-serialized method,
* emit a remark that the method should be serialized.
*
* Reason: If a thread blocks within the method for any reason, and
* another thread enters the method, the method will fail because an
* attempt will be made to create the same object twice.
*/
{
"due to creation of named objects within");
/* Emit message only ONCE per method */
}
}
}
/*******************************************************************************
*
* FUNCTION: MtMethodAnalysisWalkEnd
*
* PARAMETERS: ASL_WALK_CALLBACK
*
* RETURN: Status
*
* DESCRIPTION: Ascending callback for analysis walk. Complete method
* return analysis.
*
******************************************************************************/
void *Context)
{
{
case PARSEOP_METHOD:
case PARSEOP_RETURN:
if (!MethodInfo)
{
"No method info for this method");
CmCleanupAndExit ();
return (AE_AML_INTERNAL);
}
break;
default:
break;
}
{
case PARSEOP_METHOD:
/*
* Check if there is no return statement at the end of the
* method AND we can actually get there -- i.e., the execution
* of the method can possibly terminate without a return statement.
*/
if ((!AnLastStatementIsReturn (Op)) &&
{
/*
* No return statement, and execution can possibly exit
* via this path. This is equivalent to Return ()
*/
}
/*
* Check for case where some return statements have a return value
* and some do not. Exit without a return statement is a return with
* no value
*/
if (MethodInfo->NumReturnNoValue &&
{
}
/*
* If there are any RETURN() statements with no value, or there is a
* control path that allows the method to exit without a return value,
* we mark the method as a method that does not return a value. This
* knowledge can be used to check method invocations that expect a
* returned value.
*/
if (MethodInfo->NumReturnNoValue)
{
if (MethodInfo->NumReturnWithValue)
{
}
else
{
}
}
/*
* Check predefined method names for correct return behavior
* and correct number of arguments. Also, some special checks
* For GPE and _REG methods.
*/
{
/* Special check for two names like _L01 and _E01 in same scope */
/*
* Special check for _REG: Must have an operation region definition
* within the same scope!
*/
}
break;
case PARSEOP_NAME:
/* Special check for two names like _L01 and _E01 in same scope */
break;
case PARSEOP_RETURN:
/*
* If the parent is a predefined method name, attempt to typecheck
* the return value. Only static types can be validated.
*/
/*
* The parent block does not "exit" and continue execution -- the
* method is terminated here with the Return() statement.
*/
/* Used in the "typing" pass later */
/*
* If there is a peer node after the return statement, then this
* node is unreachable code -- i.e., it won't be executed because of
* the preceding Return() statement.
*/
{
}
break;
case PARSEOP_IF:
{
/*
* This IF has a corresponding ELSE. The IF block has no exit,
* (it contains an unconditional Return)
* mark the ELSE block to remember this fact.
*/
}
break;
case PARSEOP_ELSE:
{
/*
* This ELSE block has no exit and the corresponding IF block
* has no exit either. Therefore, the parent node has no exit.
*/
}
break;
default:
{
/* If this node has no exit, then the parent has no exit either */
}
break;
}
return (AE_OK);
}