Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 1 | // Copyright 2015 the V8 project authors. All rights reserved. |
| 2 | // Use of this source code is governed by a BSD-style license that can be |
| 3 | // found in the LICENSE file. |
| 4 | |
| 5 | #ifndef V8_PARSING_EXPRESSION_CLASSIFIER_H |
| 6 | #define V8_PARSING_EXPRESSION_CLASSIFIER_H |
| 7 | |
| 8 | #include "src/messages.h" |
| 9 | #include "src/parsing/scanner.h" |
| 10 | #include "src/parsing/token.h" |
| 11 | |
| 12 | namespace v8 { |
| 13 | namespace internal { |
| 14 | |
| 15 | |
| 16 | class ExpressionClassifier { |
| 17 | public: |
| 18 | struct Error { |
| 19 | Error() |
| 20 | : location(Scanner::Location::invalid()), |
| 21 | message(MessageTemplate::kNone), |
| 22 | type(kSyntaxError), |
| 23 | arg(nullptr) {} |
| 24 | |
| 25 | Scanner::Location location; |
| 26 | MessageTemplate::Template message : 30; |
| 27 | ParseErrorType type : 2; |
| 28 | const char* arg; |
| 29 | }; |
| 30 | |
| 31 | enum TargetProduction { |
| 32 | ExpressionProduction = 1 << 0, |
| 33 | FormalParameterInitializerProduction = 1 << 1, |
| 34 | BindingPatternProduction = 1 << 2, |
| 35 | AssignmentPatternProduction = 1 << 3, |
| 36 | DistinctFormalParametersProduction = 1 << 4, |
| 37 | StrictModeFormalParametersProduction = 1 << 5, |
| 38 | StrongModeFormalParametersProduction = 1 << 6, |
| 39 | ArrowFormalParametersProduction = 1 << 7, |
| 40 | LetPatternProduction = 1 << 8, |
| 41 | CoverInitializedNameProduction = 1 << 9, |
| 42 | |
| 43 | ExpressionProductions = |
| 44 | (ExpressionProduction | FormalParameterInitializerProduction), |
| 45 | PatternProductions = (BindingPatternProduction | |
| 46 | AssignmentPatternProduction | LetPatternProduction), |
| 47 | FormalParametersProductions = (DistinctFormalParametersProduction | |
| 48 | StrictModeFormalParametersProduction | |
| 49 | StrongModeFormalParametersProduction), |
| 50 | StandardProductions = ExpressionProductions | PatternProductions, |
| 51 | AllProductions = |
| 52 | (StandardProductions | FormalParametersProductions | |
| 53 | ArrowFormalParametersProduction | CoverInitializedNameProduction) |
| 54 | }; |
| 55 | |
| 56 | enum FunctionProperties { NonSimpleParameter = 1 << 0 }; |
| 57 | |
| 58 | ExpressionClassifier() |
| 59 | : invalid_productions_(0), |
| 60 | function_properties_(0), |
| 61 | duplicate_finder_(nullptr) {} |
| 62 | |
| 63 | explicit ExpressionClassifier(DuplicateFinder* duplicate_finder) |
| 64 | : invalid_productions_(0), |
| 65 | function_properties_(0), |
| 66 | duplicate_finder_(duplicate_finder) {} |
| 67 | |
| 68 | bool is_valid(unsigned productions) const { |
| 69 | return (invalid_productions_ & productions) == 0; |
| 70 | } |
| 71 | |
| 72 | DuplicateFinder* duplicate_finder() const { return duplicate_finder_; } |
| 73 | |
| 74 | bool is_valid_expression() const { return is_valid(ExpressionProduction); } |
| 75 | |
| 76 | bool is_valid_formal_parameter_initializer() const { |
| 77 | return is_valid(FormalParameterInitializerProduction); |
| 78 | } |
| 79 | |
| 80 | bool is_valid_binding_pattern() const { |
| 81 | return is_valid(BindingPatternProduction); |
| 82 | } |
| 83 | |
| 84 | bool is_valid_assignment_pattern() const { |
| 85 | return is_valid(AssignmentPatternProduction); |
| 86 | } |
| 87 | |
| 88 | bool is_valid_arrow_formal_parameters() const { |
| 89 | return is_valid(ArrowFormalParametersProduction); |
| 90 | } |
| 91 | |
| 92 | bool is_valid_formal_parameter_list_without_duplicates() const { |
| 93 | return is_valid(DistinctFormalParametersProduction); |
| 94 | } |
| 95 | |
| 96 | // Note: callers should also check |
| 97 | // is_valid_formal_parameter_list_without_duplicates(). |
| 98 | bool is_valid_strict_mode_formal_parameters() const { |
| 99 | return is_valid(StrictModeFormalParametersProduction); |
| 100 | } |
| 101 | |
| 102 | // Note: callers should also check is_valid_strict_mode_formal_parameters() |
| 103 | // and is_valid_formal_parameter_list_without_duplicates(). |
| 104 | bool is_valid_strong_mode_formal_parameters() const { |
| 105 | return is_valid(StrongModeFormalParametersProduction); |
| 106 | } |
| 107 | |
| 108 | bool is_valid_let_pattern() const { return is_valid(LetPatternProduction); } |
| 109 | |
| 110 | const Error& expression_error() const { return expression_error_; } |
| 111 | |
| 112 | const Error& formal_parameter_initializer_error() const { |
| 113 | return formal_parameter_initializer_error_; |
| 114 | } |
| 115 | |
| 116 | const Error& binding_pattern_error() const { return binding_pattern_error_; } |
| 117 | |
| 118 | const Error& assignment_pattern_error() const { |
| 119 | return assignment_pattern_error_; |
| 120 | } |
| 121 | |
| 122 | const Error& arrow_formal_parameters_error() const { |
| 123 | return arrow_formal_parameters_error_; |
| 124 | } |
| 125 | |
| 126 | const Error& duplicate_formal_parameter_error() const { |
| 127 | return duplicate_formal_parameter_error_; |
| 128 | } |
| 129 | |
| 130 | const Error& strict_mode_formal_parameter_error() const { |
| 131 | return strict_mode_formal_parameter_error_; |
| 132 | } |
| 133 | |
| 134 | const Error& strong_mode_formal_parameter_error() const { |
| 135 | return strong_mode_formal_parameter_error_; |
| 136 | } |
| 137 | |
| 138 | const Error& let_pattern_error() const { return let_pattern_error_; } |
| 139 | |
| 140 | bool has_cover_initialized_name() const { |
| 141 | return !is_valid(CoverInitializedNameProduction); |
| 142 | } |
| 143 | const Error& cover_initialized_name_error() const { |
| 144 | return cover_initialized_name_error_; |
| 145 | } |
| 146 | |
| 147 | bool is_simple_parameter_list() const { |
| 148 | return !(function_properties_ & NonSimpleParameter); |
| 149 | } |
| 150 | |
| 151 | void RecordNonSimpleParameter() { |
| 152 | function_properties_ |= NonSimpleParameter; |
| 153 | } |
| 154 | |
| 155 | void RecordExpressionError(const Scanner::Location& loc, |
| 156 | MessageTemplate::Template message, |
| 157 | const char* arg = nullptr) { |
| 158 | if (!is_valid_expression()) return; |
| 159 | invalid_productions_ |= ExpressionProduction; |
| 160 | expression_error_.location = loc; |
| 161 | expression_error_.message = message; |
| 162 | expression_error_.arg = arg; |
| 163 | } |
| 164 | |
| 165 | void RecordExpressionError(const Scanner::Location& loc, |
| 166 | MessageTemplate::Template message, |
| 167 | ParseErrorType type, const char* arg = nullptr) { |
| 168 | if (!is_valid_expression()) return; |
| 169 | invalid_productions_ |= ExpressionProduction; |
| 170 | expression_error_.location = loc; |
| 171 | expression_error_.message = message; |
| 172 | expression_error_.arg = arg; |
| 173 | expression_error_.type = type; |
| 174 | } |
| 175 | |
| 176 | void RecordFormalParameterInitializerError(const Scanner::Location& loc, |
| 177 | MessageTemplate::Template message, |
| 178 | const char* arg = nullptr) { |
| 179 | if (!is_valid_formal_parameter_initializer()) return; |
| 180 | invalid_productions_ |= FormalParameterInitializerProduction; |
| 181 | formal_parameter_initializer_error_.location = loc; |
| 182 | formal_parameter_initializer_error_.message = message; |
| 183 | formal_parameter_initializer_error_.arg = arg; |
| 184 | } |
| 185 | |
| 186 | void RecordBindingPatternError(const Scanner::Location& loc, |
| 187 | MessageTemplate::Template message, |
| 188 | const char* arg = nullptr) { |
| 189 | if (!is_valid_binding_pattern()) return; |
| 190 | invalid_productions_ |= BindingPatternProduction; |
| 191 | binding_pattern_error_.location = loc; |
| 192 | binding_pattern_error_.message = message; |
| 193 | binding_pattern_error_.arg = arg; |
| 194 | } |
| 195 | |
| 196 | void RecordAssignmentPatternError(const Scanner::Location& loc, |
| 197 | MessageTemplate::Template message, |
| 198 | const char* arg = nullptr) { |
| 199 | if (!is_valid_assignment_pattern()) return; |
| 200 | invalid_productions_ |= AssignmentPatternProduction; |
| 201 | assignment_pattern_error_.location = loc; |
| 202 | assignment_pattern_error_.message = message; |
| 203 | assignment_pattern_error_.arg = arg; |
| 204 | } |
| 205 | |
| 206 | void RecordPatternError(const Scanner::Location& loc, |
| 207 | MessageTemplate::Template message, |
| 208 | const char* arg = nullptr) { |
| 209 | RecordBindingPatternError(loc, message, arg); |
| 210 | RecordAssignmentPatternError(loc, message, arg); |
| 211 | } |
| 212 | |
| 213 | void RecordArrowFormalParametersError(const Scanner::Location& loc, |
| 214 | MessageTemplate::Template message, |
| 215 | const char* arg = nullptr) { |
| 216 | if (!is_valid_arrow_formal_parameters()) return; |
| 217 | invalid_productions_ |= ArrowFormalParametersProduction; |
| 218 | arrow_formal_parameters_error_.location = loc; |
| 219 | arrow_formal_parameters_error_.message = message; |
| 220 | arrow_formal_parameters_error_.arg = arg; |
| 221 | } |
| 222 | |
| 223 | void RecordDuplicateFormalParameterError(const Scanner::Location& loc) { |
| 224 | if (!is_valid_formal_parameter_list_without_duplicates()) return; |
| 225 | invalid_productions_ |= DistinctFormalParametersProduction; |
| 226 | duplicate_formal_parameter_error_.location = loc; |
| 227 | duplicate_formal_parameter_error_.message = MessageTemplate::kParamDupe; |
| 228 | duplicate_formal_parameter_error_.arg = nullptr; |
| 229 | } |
| 230 | |
| 231 | // Record a binding that would be invalid in strict mode. Confusingly this |
| 232 | // is not the same as StrictFormalParameterList, which simply forbids |
| 233 | // duplicate bindings. |
| 234 | void RecordStrictModeFormalParameterError(const Scanner::Location& loc, |
| 235 | MessageTemplate::Template message, |
| 236 | const char* arg = nullptr) { |
| 237 | if (!is_valid_strict_mode_formal_parameters()) return; |
| 238 | invalid_productions_ |= StrictModeFormalParametersProduction; |
| 239 | strict_mode_formal_parameter_error_.location = loc; |
| 240 | strict_mode_formal_parameter_error_.message = message; |
| 241 | strict_mode_formal_parameter_error_.arg = arg; |
| 242 | } |
| 243 | |
| 244 | void RecordStrongModeFormalParameterError(const Scanner::Location& loc, |
| 245 | MessageTemplate::Template message, |
| 246 | const char* arg = nullptr) { |
| 247 | if (!is_valid_strong_mode_formal_parameters()) return; |
| 248 | invalid_productions_ |= StrongModeFormalParametersProduction; |
| 249 | strong_mode_formal_parameter_error_.location = loc; |
| 250 | strong_mode_formal_parameter_error_.message = message; |
| 251 | strong_mode_formal_parameter_error_.arg = arg; |
| 252 | } |
| 253 | |
| 254 | void RecordLetPatternError(const Scanner::Location& loc, |
| 255 | MessageTemplate::Template message, |
| 256 | const char* arg = nullptr) { |
| 257 | if (!is_valid_let_pattern()) return; |
| 258 | invalid_productions_ |= LetPatternProduction; |
| 259 | let_pattern_error_.location = loc; |
| 260 | let_pattern_error_.message = message; |
| 261 | let_pattern_error_.arg = arg; |
| 262 | } |
| 263 | |
| 264 | void RecordCoverInitializedNameError(const Scanner::Location& loc, |
| 265 | MessageTemplate::Template message, |
| 266 | const char* arg = nullptr) { |
| 267 | if (has_cover_initialized_name()) return; |
| 268 | invalid_productions_ |= CoverInitializedNameProduction; |
| 269 | cover_initialized_name_error_.location = loc; |
| 270 | cover_initialized_name_error_.message = message; |
| 271 | cover_initialized_name_error_.arg = arg; |
| 272 | } |
| 273 | |
| 274 | void ForgiveCoverInitializedNameError() { |
| 275 | invalid_productions_ &= ~CoverInitializedNameProduction; |
| 276 | cover_initialized_name_error_ = Error(); |
| 277 | } |
| 278 | |
| 279 | void ForgiveAssignmentPatternError() { |
| 280 | invalid_productions_ &= ~AssignmentPatternProduction; |
| 281 | assignment_pattern_error_ = Error(); |
| 282 | } |
| 283 | |
| 284 | void Accumulate(const ExpressionClassifier& inner, |
| 285 | unsigned productions = StandardProductions) { |
| 286 | // Propagate errors from inner, but don't overwrite already recorded |
| 287 | // errors. |
| 288 | unsigned non_arrow_inner_invalid_productions = |
| 289 | inner.invalid_productions_ & ~ArrowFormalParametersProduction; |
| 290 | if (non_arrow_inner_invalid_productions == 0) return; |
| 291 | unsigned non_arrow_productions = |
| 292 | productions & ~ArrowFormalParametersProduction; |
| 293 | unsigned errors = |
| 294 | non_arrow_productions & non_arrow_inner_invalid_productions; |
| 295 | errors &= ~invalid_productions_; |
| 296 | if (errors != 0) { |
| 297 | invalid_productions_ |= errors; |
| 298 | if (errors & ExpressionProduction) |
| 299 | expression_error_ = inner.expression_error_; |
| 300 | if (errors & FormalParameterInitializerProduction) |
| 301 | formal_parameter_initializer_error_ = |
| 302 | inner.formal_parameter_initializer_error_; |
| 303 | if (errors & BindingPatternProduction) |
| 304 | binding_pattern_error_ = inner.binding_pattern_error_; |
| 305 | if (errors & AssignmentPatternProduction) |
| 306 | assignment_pattern_error_ = inner.assignment_pattern_error_; |
| 307 | if (errors & DistinctFormalParametersProduction) |
| 308 | duplicate_formal_parameter_error_ = |
| 309 | inner.duplicate_formal_parameter_error_; |
| 310 | if (errors & StrictModeFormalParametersProduction) |
| 311 | strict_mode_formal_parameter_error_ = |
| 312 | inner.strict_mode_formal_parameter_error_; |
| 313 | if (errors & StrongModeFormalParametersProduction) |
| 314 | strong_mode_formal_parameter_error_ = |
| 315 | inner.strong_mode_formal_parameter_error_; |
| 316 | if (errors & LetPatternProduction) |
| 317 | let_pattern_error_ = inner.let_pattern_error_; |
| 318 | if (errors & CoverInitializedNameProduction) |
| 319 | cover_initialized_name_error_ = inner.cover_initialized_name_error_; |
| 320 | } |
| 321 | |
| 322 | // As an exception to the above, the result continues to be a valid arrow |
| 323 | // formal parameters if the inner expression is a valid binding pattern. |
| 324 | if (productions & ArrowFormalParametersProduction && |
| 325 | is_valid_arrow_formal_parameters()) { |
| 326 | // Also copy function properties if expecting an arrow function |
| 327 | // parameter. |
| 328 | function_properties_ |= inner.function_properties_; |
| 329 | |
| 330 | if (!inner.is_valid_binding_pattern()) { |
| 331 | invalid_productions_ |= ArrowFormalParametersProduction; |
| 332 | arrow_formal_parameters_error_ = inner.binding_pattern_error_; |
| 333 | } |
| 334 | } |
| 335 | } |
| 336 | |
| 337 | private: |
| 338 | unsigned invalid_productions_; |
| 339 | unsigned function_properties_; |
| 340 | Error expression_error_; |
| 341 | Error formal_parameter_initializer_error_; |
| 342 | Error binding_pattern_error_; |
| 343 | Error assignment_pattern_error_; |
| 344 | Error arrow_formal_parameters_error_; |
| 345 | Error duplicate_formal_parameter_error_; |
| 346 | Error strict_mode_formal_parameter_error_; |
| 347 | Error strong_mode_formal_parameter_error_; |
| 348 | Error let_pattern_error_; |
| 349 | Error cover_initialized_name_error_; |
| 350 | DuplicateFinder* duplicate_finder_; |
| 351 | }; |
| 352 | |
| 353 | } // namespace internal |
| 354 | } // namespace v8 |
| 355 | |
| 356 | #endif // V8_PARSING_EXPRESSION_CLASSIFIER_H |