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 "aslcompiler.h" 46 #include "dtcompiler.h" 47 48 #define _COMPONENT ASL_PREPROCESSOR 49 ACPI_MODULE_NAME ("prparser") 50 51 void * AslLocalAllocate (unsigned int Size); 52 53 /* Bison/yacc configuration */ 54 55 #undef alloca 56 #define alloca AslLocalAllocate 57 58 int PrParserlex (void); 59 int PrParserparse (void); 60 void PrParsererror (char const *msg); 61 extern char *PrParsertext; 62 63 UINT64 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 !*/ 135 136 Value 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 ; 140 141 Expression 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 *****************************************************************************/ 211 212 void 213 PrParsererror ( 214 char const *Message) 215 { 216 DtError (ASL_ERROR, ASL_MSG_SYNTAX, 217 NULL, (char *) Message); 218 } 219 220 221 /****************************************************************************** 222 * 223 * FUNCTION: PrGetOpName 224 * 225 * PARAMETERS: ParseOpcode - Parser token (EXPOP_*) 226 * 227 * RETURN: Pointer to the opcode name 228 * 229 * DESCRIPTION: Get the ascii name of the parse opcode for debug output 230 * 231 *****************************************************************************/ 232 233 char * 234 PrGetOpName ( 235 UINT32 ParseOpcode) 236 { 237 #ifdef ASL_YYTNAME_START 238 /* 239 * First entries (PR_YYTNAME_START) in yytname are special reserved names. 240 * Ignore first 6 characters of name (EXPOP_) 241 */ 242 return ((char *) yytname 243 [(ParseOpcode - PR_FIRST_PARSE_OPCODE) + PR_YYTNAME_START] + 6); 244 #else 245 return ("[Unknown parser generator]"); 246 #endif 247 } 248 249 250 /****************************************************************************** 251 * 252 * FUNCTION: PrEvaluateExpression 253 * 254 * PARAMETERS: ExprString - Expression to be evaluated. Must be 255 * terminated by either a newline or a NUL 256 * string terminator 257 * 258 * RETURN: 64-bit value for the expression 259 * 260 * DESCRIPTION: Main entry point for the DT expression parser 261 * 262 *****************************************************************************/ 263 264 UINT64 265 PrEvaluateExpression ( 266 char *ExprString) 267 { 268 269 DbgPrint (ASL_DEBUG_OUTPUT, 270 "**** Input expression: %s\n", ExprString); 271 272 /* Point lexer to the input string */ 273 274 if (PrInitLexer (ExprString)) 275 { 276 DtError (ASL_ERROR, ASL_MSG_COMPILER_INTERNAL, 277 NULL, "Could not initialize lexer"); 278 return (0); 279 } 280 281 /* Parse/Evaluate the input string (value returned in PrParserResult) */ 282 283 PrParserparse (); 284 PrTerminateLexer (); 285 286 DbgPrint (ASL_DEBUG_OUTPUT, 287 "**** Parser returned value: %u (%8.8X%8.8X)\n", 288 (UINT32) PrParserResult, ACPI_FORMAT_UINT64 (PrParserResult)); 289 290 return (PrParserResult); 291 } 292