1 /****************************************************************************** 2 * 3 * Module Name: prexpress - Preprocessor #if expression support 4 * 5 *****************************************************************************/ 6 7 /* 8 * Copyright (C) 2000 - 2013, Intel Corp. 9 * All rights reserved. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions, and the following disclaimer, 16 * without modification. 17 * 2. Redistributions in binary form must reproduce at minimum a disclaimer 18 * substantially similar to the "NO WARRANTY" disclaimer below 19 * ("Disclaimer") and any redistribution must be conditioned upon 20 * including a substantially similar Disclaimer requirement for further 21 * binary redistribution. 22 * 3. Neither the names of the above-listed copyright holders nor the names 23 * of any contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * Alternatively, this software may be distributed under the terms of the 27 * GNU General Public License ("GPL") version 2 as published by the Free 28 * Software Foundation. 29 * 30 * NO WARRANTY 31 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 32 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 33 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR 34 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 35 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 36 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 37 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 38 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 39 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 40 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 41 * POSSIBILITY OF SUCH DAMAGES. 42 */ 43 44 #include <contrib/dev/acpica/compiler/aslcompiler.h> 45 #include <contrib/dev/acpica/compiler/dtcompiler.h> 46 47 48 #define _COMPONENT ASL_PREPROCESSOR 49 ACPI_MODULE_NAME ("prexpress") 50 51 /* Local prototypes */ 52 53 static char * 54 PrExpandMacros ( 55 char *Line); 56 57 58 #ifdef _UNDER_DEVELOPMENT 59 /****************************************************************************** 60 * 61 * FUNCTION: PrUnTokenize 62 * 63 * PARAMETERS: Buffer - Token Buffer 64 * Next - "Next" buffer from GetNextToken 65 * 66 * RETURN: None 67 * 68 * DESCRIPTION: Un-tokenized the current token buffer. The implementation is 69 * to simply set the null inserted by GetNextToken to a blank. 70 * If Next is NULL, there were no tokens found in the Buffer, 71 * so there is nothing to do. 72 * 73 *****************************************************************************/ 74 75 static void 76 PrUnTokenize ( 77 char *Buffer, 78 char *Next) 79 { 80 UINT32 Length = strlen (Buffer); 81 82 83 if (!Next) 84 { 85 return; 86 } 87 if (Buffer[Length] != '\n') 88 { 89 Buffer[strlen(Buffer)] = ' '; 90 } 91 } 92 #endif 93 94 95 /****************************************************************************** 96 * 97 * FUNCTION: PrExpandMacros 98 * 99 * PARAMETERS: Line - Pointer into the current line 100 * 101 * RETURN: Updated pointer into the current line 102 * 103 * DESCRIPTION: Expand any macros found in the current line buffer. 104 * 105 *****************************************************************************/ 106 107 static char * 108 PrExpandMacros ( 109 char *Line) 110 { 111 char *Token; 112 char *ReplaceString; 113 PR_DEFINE_INFO *DefineInfo; 114 ACPI_SIZE TokenOffset; 115 char *Next; 116 int OffsetAdjust; 117 118 119 strcpy (Gbl_ExpressionTokenBuffer, Gbl_CurrentLineBuffer); 120 Token = PrGetNextToken (Gbl_ExpressionTokenBuffer, PR_EXPR_SEPARATORS, &Next); 121 OffsetAdjust = 0; 122 123 while (Token) 124 { 125 DefineInfo = PrMatchDefine (Token); 126 if (DefineInfo) 127 { 128 if (DefineInfo->Body) 129 { 130 /* This is a macro. TBD: Is this allowed? */ 131 132 DbgPrint (ASL_DEBUG_OUTPUT, PR_PREFIX_ID 133 "Matched Macro: %s->%s\n", 134 Gbl_CurrentLineNumber, DefineInfo->Identifier, 135 DefineInfo->Replacement); 136 137 PrDoMacroInvocation (Gbl_ExpressionTokenBuffer, Token, 138 DefineInfo, &Next); 139 } 140 else 141 { 142 ReplaceString = DefineInfo->Replacement; 143 144 /* Replace the name in the original line buffer */ 145 146 TokenOffset = Token - Gbl_ExpressionTokenBuffer + OffsetAdjust; 147 PrReplaceData ( 148 &Gbl_CurrentLineBuffer[TokenOffset], strlen (Token), 149 ReplaceString, strlen (ReplaceString)); 150 151 /* Adjust for length difference between old and new name length */ 152 153 OffsetAdjust += strlen (ReplaceString) - strlen (Token); 154 155 DbgPrint (ASL_DEBUG_OUTPUT, PR_PREFIX_ID 156 "Matched #define within expression: %s->%s\n", 157 Gbl_CurrentLineNumber, Token, 158 *ReplaceString ? ReplaceString : "(NULL STRING)"); 159 } 160 } 161 162 Token = PrGetNextToken (NULL, PR_EXPR_SEPARATORS, &Next); 163 } 164 165 return (Line); 166 } 167 168 169 /****************************************************************************** 170 * 171 * FUNCTION: PrIsDefined 172 * 173 * PARAMETERS: Identifier - Name to be resolved 174 * 175 * RETURN: 64-bit boolean integer value 176 * 177 * DESCRIPTION: Returns TRUE if the name is defined, FALSE otherwise (0). 178 * 179 *****************************************************************************/ 180 181 UINT64 182 PrIsDefined ( 183 char *Identifier) 184 { 185 UINT64 Value; 186 PR_DEFINE_INFO *DefineInfo; 187 188 189 DbgPrint (ASL_DEBUG_OUTPUT, PR_PREFIX_ID 190 "**** Is defined?: %s\n", Gbl_CurrentLineNumber, Identifier); 191 192 Value = 0; /* Default is "Not defined" -- FALSE */ 193 194 DefineInfo = PrMatchDefine (Identifier); 195 if (DefineInfo) 196 { 197 Value = ACPI_UINT64_MAX; /* TRUE */ 198 } 199 200 DbgPrint (ASL_DEBUG_OUTPUT, PR_PREFIX_ID 201 "[#if defined %s] resolved to: %8.8X%8.8X\n", 202 Gbl_CurrentLineNumber, Identifier, ACPI_FORMAT_UINT64 (Value)); 203 204 return (Value); 205 } 206 207 208 /****************************************************************************** 209 * 210 * FUNCTION: PrResolveDefine 211 * 212 * PARAMETERS: Identifier - Name to be resolved 213 * 214 * RETURN: A 64-bit boolean integer value 215 * 216 * DESCRIPTION: Returns TRUE if the name is defined, FALSE otherwise (0). 217 * 218 *****************************************************************************/ 219 220 UINT64 221 PrResolveDefine ( 222 char *Identifier) 223 { 224 UINT64 Value; 225 PR_DEFINE_INFO *DefineInfo; 226 227 228 DbgPrint (ASL_DEBUG_OUTPUT, PR_PREFIX_ID 229 "**** Resolve #define: %s\n", Gbl_CurrentLineNumber, Identifier); 230 231 Value = 0; /* Default is "Not defined" -- FALSE */ 232 233 DefineInfo = PrMatchDefine (Identifier); 234 if (DefineInfo) 235 { 236 Value = ACPI_UINT64_MAX; /* TRUE */ 237 } 238 239 DbgPrint (ASL_DEBUG_OUTPUT, PR_PREFIX_ID 240 "[#if defined %s] resolved to: %8.8X%8.8X\n", 241 Gbl_CurrentLineNumber, Identifier, ACPI_FORMAT_UINT64 (Value)); 242 243 return (Value); 244 } 245 246 247 /****************************************************************************** 248 * 249 * FUNCTION: PrResolveIntegerExpression 250 * 251 * PARAMETERS: Line - Pointer to integer expression 252 * ReturnValue - Where the resolved 64-bit integer is 253 * returned. 254 * 255 * RETURN: Status 256 * 257 * DESCRIPTION: Resolve an integer expression to a single value. Supports 258 * both integer constants and labels. 259 * 260 *****************************************************************************/ 261 262 ACPI_STATUS 263 PrResolveIntegerExpression ( 264 char *Line, 265 UINT64 *ReturnValue) 266 { 267 UINT64 Result; 268 char *ExpandedLine; 269 270 271 DbgPrint (ASL_DEBUG_OUTPUT, PR_PREFIX_ID 272 "**** Resolve #if: %s\n", Gbl_CurrentLineNumber, Line); 273 274 /* Expand all macros within the expression first */ 275 276 ExpandedLine = PrExpandMacros (Line); 277 278 /* Now we can evaluate the expression */ 279 280 Result = PrEvaluateExpression (ExpandedLine); 281 DbgPrint (ASL_DEBUG_OUTPUT, PR_PREFIX_ID 282 "**** Expression Resolved to: %8.8X%8.8X\n", 283 Gbl_CurrentLineNumber, ACPI_FORMAT_UINT64 (Result)); 284 285 *ReturnValue = Result; 286 return (AE_OK); 287 288 #if 0 289 InvalidExpression: 290 291 ACPI_FREE (EvalBuffer); 292 PrError (ASL_ERROR, ASL_MSG_INVALID_EXPRESSION, 0); 293 return (AE_ERROR); 294 295 296 NormalExit: 297 298 DbgPrint (ASL_DEBUG_OUTPUT, PR_PREFIX_ID 299 "**** Expression Resolved to: %8.8X%8.8X\n", 300 Gbl_CurrentLineNumber, ACPI_FORMAT_UINT64 (Value1)); 301 302 *ReturnValue = Value1; 303 return (AE_OK); 304 #endif 305 } 306