prparser.y revision 285797 
1%{
2/******************************************************************************
3 *
4 * Module Name: prparser.y - Bison input file for preprocessor parser
5 *
6 *****************************************************************************/
7
8/*
9 * Copyright (C) 2000 - 2015, Intel Corp.
10 * All rights reserved.
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 *    notice, this list of conditions, and the following disclaimer,
17 *    without modification.
18 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
19 *    substantially similar to the "NO WARRANTY" disclaimer below
20 *    ("Disclaimer") and any redistribution must be conditioned upon
21 *    including a substantially similar Disclaimer requirement for further
22 *    binary redistribution.
23 * 3. Neither the names of the above-listed copyright holders nor the names
24 *    of any contributors may be used to endorse or promote products derived
25 *    from this software without specific prior written permission.
26 *
27 * Alternatively, this software may be distributed under the terms of the
28 * GNU General Public License ("GPL") version 2 as published by the Free
29 * Software Foundation.
30 *
31 * NO WARRANTY
32 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
33 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
34 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
35 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
36 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
37 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
38 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
39 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
40 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
41 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
42 * POSSIBILITY OF SUCH DAMAGES.
43 */
44
45#include <contrib/dev/acpica/compiler/aslcompiler.h>
46#include <contrib/dev/acpica/compiler/dtcompiler.h>
47
48#define _COMPONENT          ASL_PREPROCESSOR
49        ACPI_MODULE_NAME    ("prparser")
50
51void *                      AslLocalAllocate (unsigned int Size);
52
53/* Bison/yacc configuration */
54
55#undef alloca
56#define alloca              AslLocalAllocate
57
58int                         PrParserlex (void);
59int                         PrParserparse (void);
60void                        PrParsererror (char const *msg);
61extern char                 *PrParsertext;
62
63UINT64                      PrParserResult; /* Expression return value */
64
65/* Bison/yacc configuration */
66
67#define yytname             PrParsername
68#define YYDEBUG             1               /* Enable debug output */
69#define YYERROR_VERBOSE     1               /* Verbose error messages */
70#define YYFLAG              -32768
71
72/* Define YYMALLOC/YYFREE to prevent redefinition errors  */
73
74#define YYMALLOC            malloc
75#define YYFREE              free
76%}
77
78%union
79{
80     UINT64                 value;
81     UINT32                 op;
82     char                   *str;
83}
84
85/*! [Begin] no source code translation */
86
87%type  <value>  Expression
88
89%token <op>     EXPOP_EOF
90%token <op>     EXPOP_NEW_LINE
91%token <op>     EXPOP_NUMBER
92%token <op>     EXPOP_HEX_NUMBER
93%token <op>     EXPOP_RESERVED1
94%token <op>     EXPOP_RESERVED2
95%token <op>     EXPOP_PAREN_OPEN
96%token <op>     EXPOP_PAREN_CLOSE
97
98%left <op>      EXPOP_LOGICAL_OR
99%left <op>      EXPOP_LOGICAL_AND
100%left <op>      EXPOP_OR
101%left <op>      EXPOP_XOR
102%left <op>      EXPOP_AND
103%left <op>      EXPOP_EQUAL EXPOP_NOT_EQUAL
104%left <op>      EXPOP_GREATER EXPOP_LESS EXPOP_GREATER_EQUAL EXPOP_LESS_EQUAL
105%left <op>      EXPOP_SHIFT_RIGHT EXPOP_SHIFT_LEFT
106%left <op>      EXPOP_ADD EXPOP_SUBTRACT
107%left <op>      EXPOP_MULTIPLY EXPOP_DIVIDE EXPOP_MODULO
108%right <op>     EXPOP_ONES_COMPLIMENT EXPOP_LOGICAL_NOT
109
110/* Tokens above must be kept in synch with dtparser.y */
111
112%token <op>     EXPOP_DEFINE
113%token <op>     EXPOP_IDENTIFIER
114
115%%
116
117/*
118 *  Operator precedence rules (from K&R)
119 *
120 *  1)      ( )
121 *  2)      ! ~ (unary operators that are supported here)
122 *  3)      *   /   %
123 *  4)      +   -
124 *  5)      >>  <<
125 *  6)      <   >   <=  >=
126 *  7)      ==  !=
127 *  8)      &
128 *  9)      ^
129 *  10)     |
130 *  11)     &&
131 *  12)     ||
132 */
133
134/*! [End] no source code translation !*/
135
136Value
137    : Expression EXPOP_NEW_LINE                     { PrParserResult=$1; return 0; } /* End of line (newline) */
138    | Expression EXPOP_EOF                          { PrParserResult=$1; return 0; } /* End of string (0) */
139    ;
140
141Expression
142
143      /* Unary operators */
144
145    : EXPOP_LOGICAL_NOT         Expression          { $$ = DtDoOperator ($2, EXPOP_LOGICAL_NOT,     $2);}
146    | EXPOP_ONES_COMPLIMENT     Expression          { $$ = DtDoOperator ($2, EXPOP_ONES_COMPLIMENT, $2);}
147
148      /* Binary operators */
149
150    | Expression EXPOP_MULTIPLY         Expression  { $$ = DtDoOperator ($1, EXPOP_MULTIPLY,        $3);}
151    | Expression EXPOP_DIVIDE           Expression  { $$ = DtDoOperator ($1, EXPOP_DIVIDE,          $3);}
152    | Expression EXPOP_MODULO           Expression  { $$ = DtDoOperator ($1, EXPOP_MODULO,          $3);}
153    | Expression EXPOP_ADD              Expression  { $$ = DtDoOperator ($1, EXPOP_ADD,             $3);}
154    | Expression EXPOP_SUBTRACT         Expression  { $$ = DtDoOperator ($1, EXPOP_SUBTRACT,        $3);}
155    | Expression EXPOP_SHIFT_RIGHT      Expression  { $$ = DtDoOperator ($1, EXPOP_SHIFT_RIGHT,     $3);}
156    | Expression EXPOP_SHIFT_LEFT       Expression  { $$ = DtDoOperator ($1, EXPOP_SHIFT_LEFT,      $3);}
157    | Expression EXPOP_GREATER          Expression  { $$ = DtDoOperator ($1, EXPOP_GREATER,         $3);}
158    | Expression EXPOP_LESS             Expression  { $$ = DtDoOperator ($1, EXPOP_LESS,            $3);}
159    | Expression EXPOP_GREATER_EQUAL    Expression  { $$ = DtDoOperator ($1, EXPOP_GREATER_EQUAL,   $3);}
160    | Expression EXPOP_LESS_EQUAL       Expression  { $$ = DtDoOperator ($1, EXPOP_LESS_EQUAL,      $3);}
161    | Expression EXPOP_EQUAL            Expression  { $$ = DtDoOperator ($1, EXPOP_EQUAL,           $3);}
162    | Expression EXPOP_NOT_EQUAL        Expression  { $$ = DtDoOperator ($1, EXPOP_NOT_EQUAL,       $3);}
163    | Expression EXPOP_AND              Expression  { $$ = DtDoOperator ($1, EXPOP_AND,             $3);}
164    | Expression EXPOP_XOR              Expression  { $$ = DtDoOperator ($1, EXPOP_XOR,             $3);}
165    | Expression EXPOP_OR               Expression  { $$ = DtDoOperator ($1, EXPOP_OR,              $3);}
166    | Expression EXPOP_LOGICAL_AND      Expression  { $$ = DtDoOperator ($1, EXPOP_LOGICAL_AND,     $3);}
167    | Expression EXPOP_LOGICAL_OR       Expression  { $$ = DtDoOperator ($1, EXPOP_LOGICAL_OR,      $3);}
168
169      /* Parentheses: '(' Expression ')' */
170
171    | EXPOP_PAREN_OPEN          Expression
172        EXPOP_PAREN_CLOSE                           { $$ = $2;}
173
174      /* #if defined (ID) or #if defined ID */
175
176    | EXPOP_DEFINE EXPOP_PAREN_OPEN EXPOP_IDENTIFIER
177        EXPOP_PAREN_CLOSE                           { $$ = PrIsDefined (PrParserlval.str);}
178
179    | EXPOP_DEFINE EXPOP_IDENTIFIER                 { $$ = PrIsDefined (PrParserlval.str);}
180
181    | EXPOP_IDENTIFIER                              { $$ = PrResolveDefine (PrParserlval.str);}
182
183      /* Default base for a non-prefixed integer is 10 */
184
185    | EXPOP_NUMBER                                  { stroul64 (PrParsertext, 10, &$$);}
186
187      /* Standard hex number (0x1234) */
188
189    | EXPOP_HEX_NUMBER                              { stroul64 (PrParsertext, 16, &$$);}
190    ;
191%%
192
193/*
194 * Local support functions, including parser entry point
195 */
196#define PR_FIRST_PARSE_OPCODE   EXPOP_EOF
197#define PR_YYTNAME_START        3
198
199
200/******************************************************************************
201 *
202 * FUNCTION:    PrParsererror
203 *
204 * PARAMETERS:  Message             - Parser-generated error message
205 *
206 * RETURN:      None
207 *
208 * DESCRIPTION: Handler for parser errors
209 *
210 *****************************************************************************/
211
212void
213PrParsererror (
214    char const              *Message)
215{
216
217    sprintf (StringBuffer, "Preprocessor Parser : %s (near line %u)",
218        Message, Gbl_CurrentLineNumber);
219    DtError (ASL_ERROR, ASL_MSG_SYNTAX,
220        NULL, (char *) StringBuffer);
221}
222
223
224/******************************************************************************
225 *
226 * FUNCTION:    PrGetOpName
227 *
228 * PARAMETERS:  ParseOpcode         - Parser token (EXPOP_*)
229 *
230 * RETURN:      Pointer to the opcode name
231 *
232 * DESCRIPTION: Get the ascii name of the parse opcode for debug output
233 *
234 *****************************************************************************/
235
236char *
237PrGetOpName (
238    UINT32                  ParseOpcode)
239{
240#ifdef ASL_YYTNAME_START
241    /*
242     * First entries (PR_YYTNAME_START) in yytname are special reserved names.
243     * Ignore first 6 characters of name (EXPOP_)
244     */
245    return ((char *) yytname
246        [(ParseOpcode - PR_FIRST_PARSE_OPCODE) + PR_YYTNAME_START] + 6);
247#else
248    return ("[Unknown parser generator]");
249#endif
250}
251
252
253/******************************************************************************
254 *
255 * FUNCTION:    PrEvaluateExpression
256 *
257 * PARAMETERS:  ExprString          - Expression to be evaluated. Must be
258 *                                    terminated by either a newline or a NUL
259 *                                    string terminator
260 *
261 * RETURN:      64-bit value for the expression
262 *
263 * DESCRIPTION: Main entry point for the DT expression parser
264 *
265 *****************************************************************************/
266
267UINT64
268PrEvaluateExpression (
269    char                    *ExprString)
270{
271
272    DbgPrint (ASL_DEBUG_OUTPUT,
273        "**** Input expression: %s\n", ExprString);
274
275    /* Point lexer to the input string */
276
277    if (PrInitLexer (ExprString))
278    {
279        DtError (ASL_ERROR, ASL_MSG_COMPILER_INTERNAL,
280            NULL, "Could not initialize lexer");
281        return (0);
282    }
283
284    /* Parse/Evaluate the input string (value returned in PrParserResult) */
285
286    PrParserparse ();
287    PrTerminateLexer ();
288
289    DbgPrint (ASL_DEBUG_OUTPUT,
290        "**** Parser returned value: %u (%8.8X%8.8X)\n",
291        (UINT32) PrParserResult, ACPI_FORMAT_UINT64 (PrParserResult));
292
293    return (PrParserResult);
294}
295