1 /******************************************************************************
3 * Module Name: aslanalyze.c - Support functions for parse tree walks
5 *****************************************************************************/
8 * Copyright (C) 2000 - 2011, Intel Corp.
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23 * of any contributors may be used to endorse or promote products derived
24 * from this software without specific prior written permission.
26 * Alternatively, this software may be distributed under the terms of the
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45 #include <contrib/dev/acpica/compiler/aslcompiler.h>
46 #include "aslcompiler.y.h"
50 #define _COMPONENT ACPI_COMPILER
51 ACPI_MODULE_NAME ("aslanalyze")
54 /*******************************************************************************
56 * FUNCTION: AnIsInternalMethod
58 * PARAMETERS: Op - Current op
62 * DESCRIPTION: Check for an internal control method.
64 ******************************************************************************/
68 ACPI_PARSE_OBJECT *Op)
71 if ((!ACPI_STRCMP (Op->Asl.ExternalName, "\\_OSI")) ||
72 (!ACPI_STRCMP (Op->Asl.ExternalName, "_OSI")))
81 /*******************************************************************************
83 * FUNCTION: AnGetInternalMethodReturnType
85 * PARAMETERS: Op - Current op
89 * DESCRIPTION: Get the return type of an internal method
91 ******************************************************************************/
94 AnGetInternalMethodReturnType (
95 ACPI_PARSE_OBJECT *Op)
98 if ((!ACPI_STRCMP (Op->Asl.ExternalName, "\\_OSI")) ||
99 (!ACPI_STRCMP (Op->Asl.ExternalName, "_OSI")))
101 return (ACPI_BTYPE_STRING);
108 /*******************************************************************************
110 * FUNCTION: AnCheckId
112 * PARAMETERS: Op - Current parse op
117 * DESCRIPTION: Perform various checks on _HID and _CID strings. Only limited
118 * checks can be performed on _CID strings.
120 ******************************************************************************/
124 ACPI_PARSE_OBJECT *Op,
129 UINT32 AlphaPrefixLength;
132 /* Only care about string versions of _HID/_CID (integers are legal) */
134 if (Op->Asl.ParseOpcode != PARSEOP_STRING_LITERAL)
139 /* For both _HID and _CID, the string must be non-null */
141 Length = strlen (Op->Asl.Value.String);
144 AslError (ASL_ERROR, ASL_MSG_NULL_STRING,
150 * One of the things we want to catch here is the use of a leading
151 * asterisk in the string -- an odd construct that certain platform
152 * manufacturers are fond of. Technically, a leading asterisk is OK
153 * for _CID, but a valid use of this has not been seen.
155 if (*Op->Asl.Value.String == '*')
157 AslError (ASL_ERROR, ASL_MSG_LEADING_ASTERISK,
158 Op, Op->Asl.Value.String);
162 /* _CID strings are bus-specific, no more checks can be performed */
164 if (Type == ASL_TYPE_CID)
169 /* For _HID, all characters must be alphanumeric */
171 for (i = 0; Op->Asl.Value.String[i]; i++)
173 if (!isalnum ((int) Op->Asl.Value.String[i]))
175 AslError (ASL_ERROR, ASL_MSG_ALPHANUMERIC_STRING,
176 Op, Op->Asl.Value.String);
181 /* _HID String must be of the form "XXX####" or "ACPI####" */
183 if ((Length < 7) || (Length > 8))
185 AslError (ASL_ERROR, ASL_MSG_HID_LENGTH,
186 Op, Op->Asl.Value.String);
190 /* _HID Length is valid, now check for uppercase (first 3 or 4 chars) */
192 AlphaPrefixLength = 3;
195 AlphaPrefixLength = 4;
198 /* Ensure the alphabetic prefix is all uppercase */
200 for (i = 0; (i < AlphaPrefixLength) && Op->Asl.Value.String[i]; i++)
202 if (!isupper ((int) Op->Asl.Value.String[i]))
204 AslError (ASL_ERROR, ASL_MSG_UPPER_CASE,
205 Op, &Op->Asl.Value.String[i]);
212 /*******************************************************************************
214 * FUNCTION: AnLastStatementIsReturn
216 * PARAMETERS: Op - A method parse node
218 * RETURN: TRUE if last statement is an ASL RETURN. False otherwise
220 * DESCRIPTION: Walk down the list of top level statements within a method
221 * to find the last one. Check if that last statement is in
222 * fact a RETURN statement.
224 ******************************************************************************/
227 AnLastStatementIsReturn (
228 ACPI_PARSE_OBJECT *Op)
230 ACPI_PARSE_OBJECT *Next;
233 /* Check if last statement is a return */
235 Next = ASL_GET_CHILD_NODE (Op);
238 if ((!Next->Asl.Next) &&
239 (Next->Asl.ParseOpcode == PARSEOP_RETURN))
244 Next = ASL_GET_PEER_NODE (Next);
251 /*******************************************************************************
253 * FUNCTION: AnCheckMethodReturnValue
255 * PARAMETERS: Op - Parent
256 * OpInfo - Parent info
257 * ArgOp - Method invocation op
258 * RequiredBtypes - What caller requires
259 * ThisNodeBtype - What this node returns (if anything)
263 * DESCRIPTION: Check a method invocation for 1) A return value and if it does
264 * in fact return a value, 2) check the type of the return value.
266 ******************************************************************************/
269 AnCheckMethodReturnValue (
270 ACPI_PARSE_OBJECT *Op,
271 const ACPI_OPCODE_INFO *OpInfo,
272 ACPI_PARSE_OBJECT *ArgOp,
273 UINT32 RequiredBtypes,
274 UINT32 ThisNodeBtype)
276 ACPI_PARSE_OBJECT *OwningOp;
277 ACPI_NAMESPACE_NODE *Node;
280 Node = ArgOp->Asl.Node;
283 /* Examine the parent op of this method */
286 if (OwningOp->Asl.CompileFlags & NODE_METHOD_NO_RETVAL)
288 /* Method NEVER returns a value */
290 AslError (ASL_ERROR, ASL_MSG_NO_RETVAL, Op, Op->Asl.ExternalName);
292 else if (OwningOp->Asl.CompileFlags & NODE_METHOD_SOME_NO_RETVAL)
294 /* Method SOMETIMES returns a value, SOMETIMES not */
296 AslError (ASL_WARNING, ASL_MSG_SOME_NO_RETVAL, Op, Op->Asl.ExternalName);
298 else if (!(ThisNodeBtype & RequiredBtypes))
300 /* Method returns a value, but the type is wrong */
302 AnFormatBtype (StringBuffer, ThisNodeBtype);
303 AnFormatBtype (StringBuffer2, RequiredBtypes);
306 * The case where the method does not return any value at all
307 * was already handled in the namespace cross reference
308 * -- Only issue an error if the method in fact returns a value,
309 * but it is of the wrong type
311 if (ThisNodeBtype != 0)
314 "Method returns [%s], %s operator requires [%s]",
315 StringBuffer, OpInfo->Name, StringBuffer2);
317 AslError (ASL_ERROR, ASL_MSG_INVALID_TYPE, ArgOp, MsgBuffer);
323 /*******************************************************************************
325 * FUNCTION: AnIsResultUsed
327 * PARAMETERS: Op - Parent op for the operator
329 * RETURN: TRUE if result from this operation is actually consumed
331 * DESCRIPTION: Determine if the function result value from an operator is
334 ******************************************************************************/
338 ACPI_PARSE_OBJECT *Op)
340 ACPI_PARSE_OBJECT *Parent;
343 switch (Op->Asl.ParseOpcode)
345 case PARSEOP_INCREMENT:
346 case PARSEOP_DECREMENT:
348 /* These are standalone operators, no return value */
356 /* Examine parent to determine if the return value is used */
358 Parent = Op->Asl.Parent;
359 switch (Parent->Asl.ParseOpcode)
361 /* If/While - check if the operator is the predicate */
366 /* First child is the predicate */
368 if (Parent->Asl.Child == Op)
374 /* Not used if one of these is the parent */
377 case PARSEOP_DEFINITIONBLOCK:
383 /* Any other type of parent means that the result is used */
390 /*******************************************************************************
392 * FUNCTION: ApCheckForGpeNameConflict
394 * PARAMETERS: Op - Current parse op
398 * DESCRIPTION: Check for a conflict between GPE names within this scope.
399 * Conflict means two GPE names with the same GPE number, but
400 * different types -- such as _L1C and _E1C.
402 ******************************************************************************/
405 ApCheckForGpeNameConflict (
406 ACPI_PARSE_OBJECT *Op)
408 ACPI_PARSE_OBJECT *NextOp;
410 char Name[ACPI_NAME_SIZE + 1];
411 char Target[ACPI_NAME_SIZE];
414 /* Need a null-terminated string version of NameSeg */
416 ACPI_MOVE_32_TO_32 (Name, &Op->Asl.NameSeg);
417 Name[ACPI_NAME_SIZE] = 0;
421 * 1st char must be underscore
422 * 2nd char must be L or E
423 * 3rd/4th chars must be a hex number
425 if ((Name[0] != '_') ||
426 ((Name[1] != 'L') && (Name[1] != 'E')))
431 /* Verify 3rd/4th chars are a valid hex value */
433 GpeNumber = ACPI_STRTOUL (&Name[2], NULL, 16);
434 if (GpeNumber == ACPI_UINT32_MAX)
440 * We are now sure we have an _Lxx or _Exx.
441 * Create the target name that would cause collision (Flip E/L)
443 ACPI_MOVE_32_TO_32 (Target, Name);
445 /* Inject opposite letter ("L" versus "E") */
451 else /* Name[1] == 'E' */
456 /* Search all peers (objects within this scope) for target match */
458 NextOp = Op->Asl.Next;
462 * We mostly care about methods, but check Name() constructs also,
463 * even though they will get another error for not being a method.
464 * All GPE names must be defined as control methods.
466 if ((NextOp->Asl.ParseOpcode == PARSEOP_METHOD) ||
467 (NextOp->Asl.ParseOpcode == PARSEOP_NAME))
469 if (ACPI_COMPARE_NAME (Target, NextOp->Asl.NameSeg))
471 /* Found both _Exy and _Lxy in the same scope, error */
473 AslError (ASL_ERROR, ASL_MSG_GPE_NAME_CONFLICT, NextOp,
479 NextOp = NextOp->Asl.Next;
482 /* OK, no conflict found */
488 /*******************************************************************************
490 * FUNCTION: ApCheckRegMethod
492 * PARAMETERS: Op - Current parse op
496 * DESCRIPTION: Ensure that a _REG method has a corresponding Operation
497 * Region declaration within the same scope. Note: _REG is defined
498 * to have two arguments and must therefore be defined as a
501 ******************************************************************************/
505 ACPI_PARSE_OBJECT *Op)
507 ACPI_PARSE_OBJECT *Next;
508 ACPI_PARSE_OBJECT *Parent;
511 /* We are only interested in _REG methods */
513 if (!ACPI_COMPARE_NAME (METHOD_NAME__REG, &Op->Asl.NameSeg))
518 /* Get the start of the current scope */
520 Parent = Op->Asl.Parent;
521 Next = Parent->Asl.Child;
523 /* Search entire scope for an operation region declaration */
527 if (Next->Asl.ParseOpcode == PARSEOP_OPERATIONREGION)
529 return; /* Found region, OK */
532 Next = Next->Asl.Next;
535 /* No region found, issue warning */
537 AslError (ASL_WARNING, ASL_MSG_NO_REGION, Op, NULL);