Ben Murdoch | b8e0da2 | 2011-05-16 14:20:40 +0100 | [diff] [blame^] | 1 | |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 2 | // Copyright 2010 the V8 project authors. All rights reserved. |
| 3 | // Redistribution and use in source and binary forms, with or without |
| 4 | // modification, are permitted provided that the following conditions are |
| 5 | // met: |
| 6 | // |
| 7 | // * Redistributions of source code must retain the above copyright |
| 8 | // notice, this list of conditions and the following disclaimer. |
| 9 | // * Redistributions in binary form must reproduce the above |
| 10 | // copyright notice, this list of conditions and the following |
| 11 | // disclaimer in the documentation and/or other materials provided |
| 12 | // with the distribution. |
| 13 | // * Neither the name of Google Inc. nor the names of its |
| 14 | // contributors may be used to endorse or promote products derived |
| 15 | // from this software without specific prior written permission. |
| 16 | // |
| 17 | // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 18 | // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 19 | // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 20 | // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 21 | // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 22 | // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 23 | // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 24 | // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 25 | // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 26 | // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 27 | // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 28 | |
| 29 | #include "../include/v8stdint.h" |
| 30 | #include "unicode.h" |
| 31 | #include "globals.h" |
| 32 | #include "checks.h" |
| 33 | #include "allocation.h" |
| 34 | #include "utils.h" |
| 35 | #include "list.h" |
| 36 | #include "scanner-base.h" |
| 37 | #include "preparse-data.h" |
| 38 | #include "preparser.h" |
| 39 | |
| 40 | namespace v8 { |
| 41 | namespace preparser { |
| 42 | |
| 43 | // Preparsing checks a JavaScript program and emits preparse-data that helps |
| 44 | // a later parsing to be faster. |
| 45 | // See preparser-data.h for the data. |
| 46 | |
| 47 | // The PreParser checks that the syntax follows the grammar for JavaScript, |
| 48 | // and collects some information about the program along the way. |
| 49 | // The grammar check is only performed in order to understand the program |
| 50 | // sufficiently to deduce some information about it, that can be used |
| 51 | // to speed up later parsing. Finding errors is not the goal of pre-parsing, |
| 52 | // rather it is to speed up properly written and correct programs. |
| 53 | // That means that contextual checks (like a label being declared where |
| 54 | // it is used) are generally omitted. |
| 55 | |
| 56 | namespace i = ::v8::internal; |
| 57 | |
| 58 | #define CHECK_OK ok); \ |
| 59 | if (!*ok) return -1; \ |
| 60 | ((void)0 |
| 61 | #define DUMMY ) // to make indentation work |
| 62 | #undef DUMMY |
| 63 | |
| 64 | |
| 65 | void PreParser::ReportUnexpectedToken(i::Token::Value token) { |
| 66 | // We don't report stack overflows here, to avoid increasing the |
| 67 | // stack depth even further. Instead we report it after parsing is |
| 68 | // over, in ParseProgram. |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 69 | if (token == i::Token::ILLEGAL && stack_overflow_) { |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 70 | return; |
| 71 | } |
| 72 | i::JavaScriptScanner::Location source_location = scanner_->location(); |
| 73 | |
| 74 | // Four of the tokens are treated specially |
| 75 | switch (token) { |
| 76 | case i::Token::EOS: |
| 77 | return ReportMessageAt(source_location.beg_pos, source_location.end_pos, |
| 78 | "unexpected_eos", NULL); |
| 79 | case i::Token::NUMBER: |
| 80 | return ReportMessageAt(source_location.beg_pos, source_location.end_pos, |
| 81 | "unexpected_token_number", NULL); |
| 82 | case i::Token::STRING: |
| 83 | return ReportMessageAt(source_location.beg_pos, source_location.end_pos, |
| 84 | "unexpected_token_string", NULL); |
| 85 | case i::Token::IDENTIFIER: |
| 86 | return ReportMessageAt(source_location.beg_pos, source_location.end_pos, |
| 87 | "unexpected_token_identifier", NULL); |
| 88 | default: |
| 89 | const char* name = i::Token::String(token); |
| 90 | ReportMessageAt(source_location.beg_pos, source_location.end_pos, |
| 91 | "unexpected_token", name); |
| 92 | } |
| 93 | } |
| 94 | |
| 95 | |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 96 | PreParser::SourceElements PreParser::ParseSourceElements(int end_token, |
| 97 | bool* ok) { |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 98 | // SourceElements :: |
| 99 | // (Statement)* <end_token> |
| 100 | |
| 101 | while (peek() != end_token) { |
| 102 | ParseStatement(CHECK_OK); |
| 103 | } |
| 104 | return kUnknownSourceElements; |
| 105 | } |
| 106 | |
| 107 | |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 108 | PreParser::Statement PreParser::ParseStatement(bool* ok) { |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 109 | // Statement :: |
| 110 | // Block |
| 111 | // VariableStatement |
| 112 | // EmptyStatement |
| 113 | // ExpressionStatement |
| 114 | // IfStatement |
| 115 | // IterationStatement |
| 116 | // ContinueStatement |
| 117 | // BreakStatement |
| 118 | // ReturnStatement |
| 119 | // WithStatement |
| 120 | // LabelledStatement |
| 121 | // SwitchStatement |
| 122 | // ThrowStatement |
| 123 | // TryStatement |
| 124 | // DebuggerStatement |
| 125 | |
| 126 | // Note: Since labels can only be used by 'break' and 'continue' |
| 127 | // statements, which themselves are only valid within blocks, |
| 128 | // iterations or 'switch' statements (i.e., BreakableStatements), |
| 129 | // labels can be simply ignored in all other cases; except for |
| 130 | // trivial labeled break statements 'label: break label' which is |
| 131 | // parsed into an empty statement. |
| 132 | |
| 133 | // Keep the source position of the statement |
| 134 | switch (peek()) { |
| 135 | case i::Token::LBRACE: |
| 136 | return ParseBlock(ok); |
| 137 | |
| 138 | case i::Token::CONST: |
| 139 | case i::Token::VAR: |
| 140 | return ParseVariableStatement(ok); |
| 141 | |
| 142 | case i::Token::SEMICOLON: |
| 143 | Next(); |
| 144 | return kUnknownStatement; |
| 145 | |
| 146 | case i::Token::IF: |
| 147 | return ParseIfStatement(ok); |
| 148 | |
| 149 | case i::Token::DO: |
| 150 | return ParseDoWhileStatement(ok); |
| 151 | |
| 152 | case i::Token::WHILE: |
| 153 | return ParseWhileStatement(ok); |
| 154 | |
| 155 | case i::Token::FOR: |
| 156 | return ParseForStatement(ok); |
| 157 | |
| 158 | case i::Token::CONTINUE: |
| 159 | return ParseContinueStatement(ok); |
| 160 | |
| 161 | case i::Token::BREAK: |
| 162 | return ParseBreakStatement(ok); |
| 163 | |
| 164 | case i::Token::RETURN: |
| 165 | return ParseReturnStatement(ok); |
| 166 | |
| 167 | case i::Token::WITH: |
| 168 | return ParseWithStatement(ok); |
| 169 | |
| 170 | case i::Token::SWITCH: |
| 171 | return ParseSwitchStatement(ok); |
| 172 | |
| 173 | case i::Token::THROW: |
| 174 | return ParseThrowStatement(ok); |
| 175 | |
| 176 | case i::Token::TRY: |
| 177 | return ParseTryStatement(ok); |
| 178 | |
| 179 | case i::Token::FUNCTION: |
| 180 | return ParseFunctionDeclaration(ok); |
| 181 | |
| 182 | case i::Token::NATIVE: |
| 183 | return ParseNativeDeclaration(ok); |
| 184 | |
| 185 | case i::Token::DEBUGGER: |
| 186 | return ParseDebuggerStatement(ok); |
| 187 | |
| 188 | default: |
| 189 | return ParseExpressionOrLabelledStatement(ok); |
| 190 | } |
| 191 | } |
| 192 | |
| 193 | |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 194 | PreParser::Statement PreParser::ParseFunctionDeclaration(bool* ok) { |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 195 | // FunctionDeclaration :: |
| 196 | // 'function' Identifier '(' FormalParameterListopt ')' '{' FunctionBody '}' |
| 197 | Expect(i::Token::FUNCTION, CHECK_OK); |
| 198 | ParseIdentifier(CHECK_OK); |
| 199 | ParseFunctionLiteral(CHECK_OK); |
| 200 | return kUnknownStatement; |
| 201 | } |
| 202 | |
| 203 | |
| 204 | // Language extension which is only enabled for source files loaded |
| 205 | // through the API's extension mechanism. A native function |
| 206 | // declaration is resolved by looking up the function through a |
| 207 | // callback provided by the extension. |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 208 | PreParser::Statement PreParser::ParseNativeDeclaration(bool* ok) { |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 209 | Expect(i::Token::NATIVE, CHECK_OK); |
| 210 | Expect(i::Token::FUNCTION, CHECK_OK); |
| 211 | ParseIdentifier(CHECK_OK); |
| 212 | Expect(i::Token::LPAREN, CHECK_OK); |
| 213 | bool done = (peek() == i::Token::RPAREN); |
| 214 | while (!done) { |
| 215 | ParseIdentifier(CHECK_OK); |
| 216 | done = (peek() == i::Token::RPAREN); |
| 217 | if (!done) { |
| 218 | Expect(i::Token::COMMA, CHECK_OK); |
| 219 | } |
| 220 | } |
| 221 | Expect(i::Token::RPAREN, CHECK_OK); |
| 222 | Expect(i::Token::SEMICOLON, CHECK_OK); |
| 223 | return kUnknownStatement; |
| 224 | } |
| 225 | |
| 226 | |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 227 | PreParser::Statement PreParser::ParseBlock(bool* ok) { |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 228 | // Block :: |
| 229 | // '{' Statement* '}' |
| 230 | |
| 231 | // Note that a Block does not introduce a new execution scope! |
| 232 | // (ECMA-262, 3rd, 12.2) |
| 233 | // |
| 234 | Expect(i::Token::LBRACE, CHECK_OK); |
| 235 | while (peek() != i::Token::RBRACE) { |
| 236 | ParseStatement(CHECK_OK); |
| 237 | } |
| 238 | Expect(i::Token::RBRACE, CHECK_OK); |
| 239 | return kUnknownStatement; |
| 240 | } |
| 241 | |
| 242 | |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 243 | PreParser::Statement PreParser::ParseVariableStatement(bool* ok) { |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 244 | // VariableStatement :: |
| 245 | // VariableDeclarations ';' |
| 246 | |
| 247 | Statement result = ParseVariableDeclarations(true, NULL, CHECK_OK); |
| 248 | ExpectSemicolon(CHECK_OK); |
| 249 | return result; |
| 250 | } |
| 251 | |
| 252 | |
| 253 | // If the variable declaration declares exactly one non-const |
| 254 | // variable, then *var is set to that variable. In all other cases, |
| 255 | // *var is untouched; in particular, it is the caller's responsibility |
| 256 | // to initialize it properly. This mechanism is also used for the parsing |
| 257 | // of 'for-in' loops. |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 258 | PreParser::Statement PreParser::ParseVariableDeclarations(bool accept_IN, |
| 259 | int* num_decl, |
| 260 | bool* ok) { |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 261 | // VariableDeclarations :: |
| 262 | // ('var' | 'const') (Identifier ('=' AssignmentExpression)?)+[','] |
| 263 | |
| 264 | if (peek() == i::Token::VAR) { |
| 265 | Consume(i::Token::VAR); |
| 266 | } else if (peek() == i::Token::CONST) { |
| 267 | Consume(i::Token::CONST); |
| 268 | } else { |
| 269 | *ok = false; |
| 270 | return 0; |
| 271 | } |
| 272 | |
| 273 | // The scope of a variable/const declared anywhere inside a function |
| 274 | // is the entire function (ECMA-262, 3rd, 10.1.3, and 12.2). . |
| 275 | int nvars = 0; // the number of variables declared |
| 276 | do { |
| 277 | // Parse variable name. |
| 278 | if (nvars > 0) Consume(i::Token::COMMA); |
| 279 | ParseIdentifier(CHECK_OK); |
| 280 | nvars++; |
| 281 | if (peek() == i::Token::ASSIGN) { |
| 282 | Expect(i::Token::ASSIGN, CHECK_OK); |
| 283 | ParseAssignmentExpression(accept_IN, CHECK_OK); |
| 284 | } |
| 285 | } while (peek() == i::Token::COMMA); |
| 286 | |
| 287 | if (num_decl != NULL) *num_decl = nvars; |
| 288 | return kUnknownStatement; |
| 289 | } |
| 290 | |
| 291 | |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 292 | PreParser::Statement PreParser::ParseExpressionOrLabelledStatement( |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 293 | bool* ok) { |
| 294 | // ExpressionStatement | LabelledStatement :: |
| 295 | // Expression ';' |
| 296 | // Identifier ':' Statement |
| 297 | |
| 298 | Expression expr = ParseExpression(true, CHECK_OK); |
| 299 | if (peek() == i::Token::COLON && expr == kIdentifierExpression) { |
| 300 | Consume(i::Token::COLON); |
| 301 | return ParseStatement(ok); |
| 302 | } |
| 303 | // Parsed expression statement. |
| 304 | ExpectSemicolon(CHECK_OK); |
| 305 | return kUnknownStatement; |
| 306 | } |
| 307 | |
| 308 | |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 309 | PreParser::Statement PreParser::ParseIfStatement(bool* ok) { |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 310 | // IfStatement :: |
| 311 | // 'if' '(' Expression ')' Statement ('else' Statement)? |
| 312 | |
| 313 | Expect(i::Token::IF, CHECK_OK); |
| 314 | Expect(i::Token::LPAREN, CHECK_OK); |
| 315 | ParseExpression(true, CHECK_OK); |
| 316 | Expect(i::Token::RPAREN, CHECK_OK); |
| 317 | ParseStatement(CHECK_OK); |
| 318 | if (peek() == i::Token::ELSE) { |
| 319 | Next(); |
| 320 | ParseStatement(CHECK_OK); |
| 321 | } |
| 322 | return kUnknownStatement; |
| 323 | } |
| 324 | |
| 325 | |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 326 | PreParser::Statement PreParser::ParseContinueStatement(bool* ok) { |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 327 | // ContinueStatement :: |
| 328 | // 'continue' [no line terminator] Identifier? ';' |
| 329 | |
| 330 | Expect(i::Token::CONTINUE, CHECK_OK); |
| 331 | i::Token::Value tok = peek(); |
| 332 | if (!scanner_->has_line_terminator_before_next() && |
| 333 | tok != i::Token::SEMICOLON && |
| 334 | tok != i::Token::RBRACE && |
| 335 | tok != i::Token::EOS) { |
| 336 | ParseIdentifier(CHECK_OK); |
| 337 | } |
| 338 | ExpectSemicolon(CHECK_OK); |
| 339 | return kUnknownStatement; |
| 340 | } |
| 341 | |
| 342 | |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 343 | PreParser::Statement PreParser::ParseBreakStatement(bool* ok) { |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 344 | // BreakStatement :: |
| 345 | // 'break' [no line terminator] Identifier? ';' |
| 346 | |
| 347 | Expect(i::Token::BREAK, CHECK_OK); |
| 348 | i::Token::Value tok = peek(); |
| 349 | if (!scanner_->has_line_terminator_before_next() && |
| 350 | tok != i::Token::SEMICOLON && |
| 351 | tok != i::Token::RBRACE && |
| 352 | tok != i::Token::EOS) { |
| 353 | ParseIdentifier(CHECK_OK); |
| 354 | } |
| 355 | ExpectSemicolon(CHECK_OK); |
| 356 | return kUnknownStatement; |
| 357 | } |
| 358 | |
| 359 | |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 360 | PreParser::Statement PreParser::ParseReturnStatement(bool* ok) { |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 361 | // ReturnStatement :: |
| 362 | // 'return' [no line terminator] Expression? ';' |
| 363 | |
| 364 | // Consume the return token. It is necessary to do the before |
| 365 | // reporting any errors on it, because of the way errors are |
| 366 | // reported (underlining). |
| 367 | Expect(i::Token::RETURN, CHECK_OK); |
| 368 | |
| 369 | // An ECMAScript program is considered syntactically incorrect if it |
| 370 | // contains a return statement that is not within the body of a |
| 371 | // function. See ECMA-262, section 12.9, page 67. |
| 372 | // This is not handled during preparsing. |
| 373 | |
| 374 | i::Token::Value tok = peek(); |
| 375 | if (!scanner_->has_line_terminator_before_next() && |
| 376 | tok != i::Token::SEMICOLON && |
| 377 | tok != i::Token::RBRACE && |
| 378 | tok != i::Token::EOS) { |
| 379 | ParseExpression(true, CHECK_OK); |
| 380 | } |
| 381 | ExpectSemicolon(CHECK_OK); |
| 382 | return kUnknownStatement; |
| 383 | } |
| 384 | |
| 385 | |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 386 | PreParser::Statement PreParser::ParseWithStatement(bool* ok) { |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 387 | // WithStatement :: |
| 388 | // 'with' '(' Expression ')' Statement |
| 389 | Expect(i::Token::WITH, CHECK_OK); |
| 390 | Expect(i::Token::LPAREN, CHECK_OK); |
| 391 | ParseExpression(true, CHECK_OK); |
| 392 | Expect(i::Token::RPAREN, CHECK_OK); |
| 393 | |
| 394 | scope_->EnterWith(); |
| 395 | ParseStatement(CHECK_OK); |
| 396 | scope_->LeaveWith(); |
| 397 | return kUnknownStatement; |
| 398 | } |
| 399 | |
| 400 | |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 401 | PreParser::Statement PreParser::ParseSwitchStatement(bool* ok) { |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 402 | // SwitchStatement :: |
| 403 | // 'switch' '(' Expression ')' '{' CaseClause* '}' |
| 404 | |
| 405 | Expect(i::Token::SWITCH, CHECK_OK); |
| 406 | Expect(i::Token::LPAREN, CHECK_OK); |
| 407 | ParseExpression(true, CHECK_OK); |
| 408 | Expect(i::Token::RPAREN, CHECK_OK); |
| 409 | |
| 410 | Expect(i::Token::LBRACE, CHECK_OK); |
| 411 | i::Token::Value token = peek(); |
| 412 | while (token != i::Token::RBRACE) { |
| 413 | if (token == i::Token::CASE) { |
| 414 | Expect(i::Token::CASE, CHECK_OK); |
| 415 | ParseExpression(true, CHECK_OK); |
| 416 | Expect(i::Token::COLON, CHECK_OK); |
| 417 | } else if (token == i::Token::DEFAULT) { |
| 418 | Expect(i::Token::DEFAULT, CHECK_OK); |
| 419 | Expect(i::Token::COLON, CHECK_OK); |
| 420 | } else { |
| 421 | ParseStatement(CHECK_OK); |
| 422 | } |
| 423 | token = peek(); |
| 424 | } |
| 425 | Expect(i::Token::RBRACE, CHECK_OK); |
| 426 | |
| 427 | return kUnknownStatement; |
| 428 | } |
| 429 | |
| 430 | |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 431 | PreParser::Statement PreParser::ParseDoWhileStatement(bool* ok) { |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 432 | // DoStatement :: |
| 433 | // 'do' Statement 'while' '(' Expression ')' ';' |
| 434 | |
| 435 | Expect(i::Token::DO, CHECK_OK); |
| 436 | ParseStatement(CHECK_OK); |
| 437 | Expect(i::Token::WHILE, CHECK_OK); |
| 438 | Expect(i::Token::LPAREN, CHECK_OK); |
| 439 | ParseExpression(true, CHECK_OK); |
| 440 | Expect(i::Token::RPAREN, CHECK_OK); |
| 441 | return kUnknownStatement; |
| 442 | } |
| 443 | |
| 444 | |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 445 | PreParser::Statement PreParser::ParseWhileStatement(bool* ok) { |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 446 | // WhileStatement :: |
| 447 | // 'while' '(' Expression ')' Statement |
| 448 | |
| 449 | Expect(i::Token::WHILE, CHECK_OK); |
| 450 | Expect(i::Token::LPAREN, CHECK_OK); |
| 451 | ParseExpression(true, CHECK_OK); |
| 452 | Expect(i::Token::RPAREN, CHECK_OK); |
| 453 | ParseStatement(CHECK_OK); |
| 454 | return kUnknownStatement; |
| 455 | } |
| 456 | |
| 457 | |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 458 | PreParser::Statement PreParser::ParseForStatement(bool* ok) { |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 459 | // ForStatement :: |
| 460 | // 'for' '(' Expression? ';' Expression? ';' Expression? ')' Statement |
| 461 | |
| 462 | Expect(i::Token::FOR, CHECK_OK); |
| 463 | Expect(i::Token::LPAREN, CHECK_OK); |
| 464 | if (peek() != i::Token::SEMICOLON) { |
| 465 | if (peek() == i::Token::VAR || peek() == i::Token::CONST) { |
| 466 | int decl_count; |
| 467 | ParseVariableDeclarations(false, &decl_count, CHECK_OK); |
| 468 | if (peek() == i::Token::IN && decl_count == 1) { |
| 469 | Expect(i::Token::IN, CHECK_OK); |
| 470 | ParseExpression(true, CHECK_OK); |
| 471 | Expect(i::Token::RPAREN, CHECK_OK); |
| 472 | |
| 473 | ParseStatement(CHECK_OK); |
| 474 | return kUnknownStatement; |
| 475 | } |
| 476 | } else { |
| 477 | ParseExpression(false, CHECK_OK); |
| 478 | if (peek() == i::Token::IN) { |
| 479 | Expect(i::Token::IN, CHECK_OK); |
| 480 | ParseExpression(true, CHECK_OK); |
| 481 | Expect(i::Token::RPAREN, CHECK_OK); |
| 482 | |
| 483 | ParseStatement(CHECK_OK); |
| 484 | return kUnknownStatement; |
| 485 | } |
| 486 | } |
| 487 | } |
| 488 | |
| 489 | // Parsed initializer at this point. |
| 490 | Expect(i::Token::SEMICOLON, CHECK_OK); |
| 491 | |
| 492 | if (peek() != i::Token::SEMICOLON) { |
| 493 | ParseExpression(true, CHECK_OK); |
| 494 | } |
| 495 | Expect(i::Token::SEMICOLON, CHECK_OK); |
| 496 | |
| 497 | if (peek() != i::Token::RPAREN) { |
| 498 | ParseExpression(true, CHECK_OK); |
| 499 | } |
| 500 | Expect(i::Token::RPAREN, CHECK_OK); |
| 501 | |
| 502 | ParseStatement(CHECK_OK); |
| 503 | return kUnknownStatement; |
| 504 | } |
| 505 | |
| 506 | |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 507 | PreParser::Statement PreParser::ParseThrowStatement(bool* ok) { |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 508 | // ThrowStatement :: |
| 509 | // 'throw' [no line terminator] Expression ';' |
| 510 | |
| 511 | Expect(i::Token::THROW, CHECK_OK); |
| 512 | if (scanner_->has_line_terminator_before_next()) { |
| 513 | i::JavaScriptScanner::Location pos = scanner_->location(); |
| 514 | ReportMessageAt(pos.beg_pos, pos.end_pos, |
| 515 | "newline_after_throw", NULL); |
| 516 | *ok = false; |
| 517 | return kUnknownStatement; |
| 518 | } |
| 519 | ParseExpression(true, CHECK_OK); |
| 520 | ExpectSemicolon(CHECK_OK); |
| 521 | |
| 522 | return kUnknownStatement; |
| 523 | } |
| 524 | |
| 525 | |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 526 | PreParser::Statement PreParser::ParseTryStatement(bool* ok) { |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 527 | // TryStatement :: |
| 528 | // 'try' Block Catch |
| 529 | // 'try' Block Finally |
| 530 | // 'try' Block Catch Finally |
| 531 | // |
| 532 | // Catch :: |
| 533 | // 'catch' '(' Identifier ')' Block |
| 534 | // |
| 535 | // Finally :: |
| 536 | // 'finally' Block |
| 537 | |
| 538 | // In preparsing, allow any number of catch/finally blocks, including zero |
| 539 | // of both. |
| 540 | |
| 541 | Expect(i::Token::TRY, CHECK_OK); |
| 542 | |
| 543 | ParseBlock(CHECK_OK); |
| 544 | |
| 545 | bool catch_or_finally_seen = false; |
| 546 | if (peek() == i::Token::CATCH) { |
| 547 | Consume(i::Token::CATCH); |
| 548 | Expect(i::Token::LPAREN, CHECK_OK); |
| 549 | ParseIdentifier(CHECK_OK); |
| 550 | Expect(i::Token::RPAREN, CHECK_OK); |
| 551 | scope_->EnterWith(); |
| 552 | ParseBlock(ok); |
| 553 | scope_->LeaveWith(); |
| 554 | if (!*ok) return kUnknownStatement; |
| 555 | catch_or_finally_seen = true; |
| 556 | } |
| 557 | if (peek() == i::Token::FINALLY) { |
| 558 | Consume(i::Token::FINALLY); |
| 559 | ParseBlock(CHECK_OK); |
| 560 | catch_or_finally_seen = true; |
| 561 | } |
| 562 | if (!catch_or_finally_seen) { |
| 563 | *ok = false; |
| 564 | } |
| 565 | return kUnknownStatement; |
| 566 | } |
| 567 | |
| 568 | |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 569 | PreParser::Statement PreParser::ParseDebuggerStatement(bool* ok) { |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 570 | // In ECMA-262 'debugger' is defined as a reserved keyword. In some browser |
| 571 | // contexts this is used as a statement which invokes the debugger as if a |
| 572 | // break point is present. |
| 573 | // DebuggerStatement :: |
| 574 | // 'debugger' ';' |
| 575 | |
| 576 | Expect(i::Token::DEBUGGER, CHECK_OK); |
| 577 | ExpectSemicolon(CHECK_OK); |
| 578 | return kUnknownStatement; |
| 579 | } |
| 580 | |
| 581 | |
| 582 | // Precedence = 1 |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 583 | PreParser::Expression PreParser::ParseExpression(bool accept_IN, bool* ok) { |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 584 | // Expression :: |
| 585 | // AssignmentExpression |
| 586 | // Expression ',' AssignmentExpression |
| 587 | |
| 588 | Expression result = ParseAssignmentExpression(accept_IN, CHECK_OK); |
| 589 | while (peek() == i::Token::COMMA) { |
| 590 | Expect(i::Token::COMMA, CHECK_OK); |
| 591 | ParseAssignmentExpression(accept_IN, CHECK_OK); |
| 592 | result = kUnknownExpression; |
| 593 | } |
| 594 | return result; |
| 595 | } |
| 596 | |
| 597 | |
| 598 | // Precedence = 2 |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 599 | PreParser::Expression PreParser::ParseAssignmentExpression(bool accept_IN, |
| 600 | bool* ok) { |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 601 | // AssignmentExpression :: |
| 602 | // ConditionalExpression |
| 603 | // LeftHandSideExpression AssignmentOperator AssignmentExpression |
| 604 | |
| 605 | Expression expression = ParseConditionalExpression(accept_IN, CHECK_OK); |
| 606 | |
| 607 | if (!i::Token::IsAssignmentOp(peek())) { |
| 608 | // Parsed conditional expression only (no assignment). |
| 609 | return expression; |
| 610 | } |
| 611 | |
| 612 | i::Token::Value op = Next(); // Get assignment operator. |
| 613 | ParseAssignmentExpression(accept_IN, CHECK_OK); |
| 614 | |
| 615 | if ((op == i::Token::ASSIGN) && (expression == kThisPropertyExpression)) { |
| 616 | scope_->AddProperty(); |
| 617 | } |
| 618 | |
| 619 | return kUnknownExpression; |
| 620 | } |
| 621 | |
| 622 | |
| 623 | // Precedence = 3 |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 624 | PreParser::Expression PreParser::ParseConditionalExpression(bool accept_IN, |
| 625 | bool* ok) { |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 626 | // ConditionalExpression :: |
| 627 | // LogicalOrExpression |
| 628 | // LogicalOrExpression '?' AssignmentExpression ':' AssignmentExpression |
| 629 | |
| 630 | // We start using the binary expression parser for prec >= 4 only! |
| 631 | Expression expression = ParseBinaryExpression(4, accept_IN, CHECK_OK); |
| 632 | if (peek() != i::Token::CONDITIONAL) return expression; |
| 633 | Consume(i::Token::CONDITIONAL); |
| 634 | // In parsing the first assignment expression in conditional |
| 635 | // expressions we always accept the 'in' keyword; see ECMA-262, |
| 636 | // section 11.12, page 58. |
| 637 | ParseAssignmentExpression(true, CHECK_OK); |
| 638 | Expect(i::Token::COLON, CHECK_OK); |
| 639 | ParseAssignmentExpression(accept_IN, CHECK_OK); |
| 640 | return kUnknownExpression; |
| 641 | } |
| 642 | |
| 643 | |
| 644 | int PreParser::Precedence(i::Token::Value tok, bool accept_IN) { |
| 645 | if (tok == i::Token::IN && !accept_IN) |
| 646 | return 0; // 0 precedence will terminate binary expression parsing |
| 647 | |
| 648 | return i::Token::Precedence(tok); |
| 649 | } |
| 650 | |
| 651 | |
| 652 | // Precedence >= 4 |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 653 | PreParser::Expression PreParser::ParseBinaryExpression(int prec, |
| 654 | bool accept_IN, |
| 655 | bool* ok) { |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 656 | Expression result = ParseUnaryExpression(CHECK_OK); |
| 657 | for (int prec1 = Precedence(peek(), accept_IN); prec1 >= prec; prec1--) { |
| 658 | // prec1 >= 4 |
| 659 | while (Precedence(peek(), accept_IN) == prec1) { |
| 660 | Next(); |
| 661 | ParseBinaryExpression(prec1 + 1, accept_IN, CHECK_OK); |
| 662 | result = kUnknownExpression; |
| 663 | } |
| 664 | } |
| 665 | return result; |
| 666 | } |
| 667 | |
| 668 | |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 669 | PreParser::Expression PreParser::ParseUnaryExpression(bool* ok) { |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 670 | // UnaryExpression :: |
| 671 | // PostfixExpression |
| 672 | // 'delete' UnaryExpression |
| 673 | // 'void' UnaryExpression |
| 674 | // 'typeof' UnaryExpression |
| 675 | // '++' UnaryExpression |
| 676 | // '--' UnaryExpression |
| 677 | // '+' UnaryExpression |
| 678 | // '-' UnaryExpression |
| 679 | // '~' UnaryExpression |
| 680 | // '!' UnaryExpression |
| 681 | |
| 682 | i::Token::Value op = peek(); |
| 683 | if (i::Token::IsUnaryOp(op) || i::Token::IsCountOp(op)) { |
| 684 | op = Next(); |
| 685 | ParseUnaryExpression(ok); |
| 686 | return kUnknownExpression; |
| 687 | } else { |
| 688 | return ParsePostfixExpression(ok); |
| 689 | } |
| 690 | } |
| 691 | |
| 692 | |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 693 | PreParser::Expression PreParser::ParsePostfixExpression(bool* ok) { |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 694 | // PostfixExpression :: |
| 695 | // LeftHandSideExpression ('++' | '--')? |
| 696 | |
| 697 | Expression expression = ParseLeftHandSideExpression(CHECK_OK); |
| 698 | if (!scanner_->has_line_terminator_before_next() && |
| 699 | i::Token::IsCountOp(peek())) { |
| 700 | Next(); |
| 701 | return kUnknownExpression; |
| 702 | } |
| 703 | return expression; |
| 704 | } |
| 705 | |
| 706 | |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 707 | PreParser::Expression PreParser::ParseLeftHandSideExpression(bool* ok) { |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 708 | // LeftHandSideExpression :: |
| 709 | // (NewExpression | MemberExpression) ... |
| 710 | |
| 711 | Expression result; |
| 712 | if (peek() == i::Token::NEW) { |
| 713 | result = ParseNewExpression(CHECK_OK); |
| 714 | } else { |
| 715 | result = ParseMemberExpression(CHECK_OK); |
| 716 | } |
| 717 | |
| 718 | while (true) { |
| 719 | switch (peek()) { |
| 720 | case i::Token::LBRACK: { |
| 721 | Consume(i::Token::LBRACK); |
| 722 | ParseExpression(true, CHECK_OK); |
| 723 | Expect(i::Token::RBRACK, CHECK_OK); |
| 724 | if (result == kThisExpression) { |
| 725 | result = kThisPropertyExpression; |
| 726 | } else { |
| 727 | result = kUnknownExpression; |
| 728 | } |
| 729 | break; |
| 730 | } |
| 731 | |
| 732 | case i::Token::LPAREN: { |
| 733 | ParseArguments(CHECK_OK); |
| 734 | result = kUnknownExpression; |
| 735 | break; |
| 736 | } |
| 737 | |
| 738 | case i::Token::PERIOD: { |
| 739 | Consume(i::Token::PERIOD); |
| 740 | ParseIdentifierName(CHECK_OK); |
| 741 | if (result == kThisExpression) { |
| 742 | result = kThisPropertyExpression; |
| 743 | } else { |
| 744 | result = kUnknownExpression; |
| 745 | } |
| 746 | break; |
| 747 | } |
| 748 | |
| 749 | default: |
| 750 | return result; |
| 751 | } |
| 752 | } |
| 753 | } |
| 754 | |
| 755 | |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 756 | PreParser::Expression PreParser::ParseNewExpression(bool* ok) { |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 757 | // NewExpression :: |
| 758 | // ('new')+ MemberExpression |
| 759 | |
| 760 | // The grammar for new expressions is pretty warped. The keyword |
| 761 | // 'new' can either be a part of the new expression (where it isn't |
| 762 | // followed by an argument list) or a part of the member expression, |
| 763 | // where it must be followed by an argument list. To accommodate |
| 764 | // this, we parse the 'new' keywords greedily and keep track of how |
| 765 | // many we have parsed. This information is then passed on to the |
| 766 | // member expression parser, which is only allowed to match argument |
| 767 | // lists as long as it has 'new' prefixes left |
| 768 | unsigned new_count = 0; |
| 769 | do { |
| 770 | Consume(i::Token::NEW); |
| 771 | new_count++; |
| 772 | } while (peek() == i::Token::NEW); |
| 773 | |
| 774 | return ParseMemberWithNewPrefixesExpression(new_count, ok); |
| 775 | } |
| 776 | |
| 777 | |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 778 | PreParser::Expression PreParser::ParseMemberExpression(bool* ok) { |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 779 | return ParseMemberWithNewPrefixesExpression(0, ok); |
| 780 | } |
| 781 | |
| 782 | |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 783 | PreParser::Expression PreParser::ParseMemberWithNewPrefixesExpression( |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 784 | unsigned new_count, bool* ok) { |
| 785 | // MemberExpression :: |
| 786 | // (PrimaryExpression | FunctionLiteral) |
| 787 | // ('[' Expression ']' | '.' Identifier | Arguments)* |
| 788 | |
| 789 | // Parse the initial primary or function expression. |
| 790 | Expression result = kUnknownExpression; |
| 791 | if (peek() == i::Token::FUNCTION) { |
| 792 | Consume(i::Token::FUNCTION); |
| 793 | if (peek() == i::Token::IDENTIFIER) { |
| 794 | ParseIdentifier(CHECK_OK); |
| 795 | } |
| 796 | result = ParseFunctionLiteral(CHECK_OK); |
| 797 | } else { |
| 798 | result = ParsePrimaryExpression(CHECK_OK); |
| 799 | } |
| 800 | |
| 801 | while (true) { |
| 802 | switch (peek()) { |
| 803 | case i::Token::LBRACK: { |
| 804 | Consume(i::Token::LBRACK); |
| 805 | ParseExpression(true, CHECK_OK); |
| 806 | Expect(i::Token::RBRACK, CHECK_OK); |
| 807 | if (result == kThisExpression) { |
| 808 | result = kThisPropertyExpression; |
| 809 | } else { |
| 810 | result = kUnknownExpression; |
| 811 | } |
| 812 | break; |
| 813 | } |
| 814 | case i::Token::PERIOD: { |
| 815 | Consume(i::Token::PERIOD); |
| 816 | ParseIdentifierName(CHECK_OK); |
| 817 | if (result == kThisExpression) { |
| 818 | result = kThisPropertyExpression; |
| 819 | } else { |
| 820 | result = kUnknownExpression; |
| 821 | } |
| 822 | break; |
| 823 | } |
| 824 | case i::Token::LPAREN: { |
| 825 | if (new_count == 0) return result; |
| 826 | // Consume one of the new prefixes (already parsed). |
| 827 | ParseArguments(CHECK_OK); |
| 828 | new_count--; |
| 829 | result = kUnknownExpression; |
| 830 | break; |
| 831 | } |
| 832 | default: |
| 833 | return result; |
| 834 | } |
| 835 | } |
| 836 | } |
| 837 | |
| 838 | |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 839 | PreParser::Expression PreParser::ParsePrimaryExpression(bool* ok) { |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 840 | // PrimaryExpression :: |
| 841 | // 'this' |
| 842 | // 'null' |
| 843 | // 'true' |
| 844 | // 'false' |
| 845 | // Identifier |
| 846 | // Number |
| 847 | // String |
| 848 | // ArrayLiteral |
| 849 | // ObjectLiteral |
| 850 | // RegExpLiteral |
| 851 | // '(' Expression ')' |
| 852 | |
| 853 | Expression result = kUnknownExpression; |
| 854 | switch (peek()) { |
| 855 | case i::Token::THIS: { |
| 856 | Next(); |
| 857 | result = kThisExpression; |
| 858 | break; |
| 859 | } |
| 860 | |
| 861 | case i::Token::IDENTIFIER: { |
| 862 | ParseIdentifier(CHECK_OK); |
| 863 | result = kIdentifierExpression; |
| 864 | break; |
| 865 | } |
| 866 | |
| 867 | case i::Token::NULL_LITERAL: |
| 868 | case i::Token::TRUE_LITERAL: |
| 869 | case i::Token::FALSE_LITERAL: |
| 870 | case i::Token::NUMBER: { |
| 871 | Next(); |
| 872 | break; |
| 873 | } |
| 874 | case i::Token::STRING: { |
| 875 | Next(); |
| 876 | result = GetStringSymbol(); |
| 877 | break; |
| 878 | } |
| 879 | |
| 880 | case i::Token::ASSIGN_DIV: |
| 881 | result = ParseRegExpLiteral(true, CHECK_OK); |
| 882 | break; |
| 883 | |
| 884 | case i::Token::DIV: |
| 885 | result = ParseRegExpLiteral(false, CHECK_OK); |
| 886 | break; |
| 887 | |
| 888 | case i::Token::LBRACK: |
| 889 | result = ParseArrayLiteral(CHECK_OK); |
| 890 | break; |
| 891 | |
| 892 | case i::Token::LBRACE: |
| 893 | result = ParseObjectLiteral(CHECK_OK); |
| 894 | break; |
| 895 | |
| 896 | case i::Token::LPAREN: |
| 897 | Consume(i::Token::LPAREN); |
Ben Murdoch | b8e0da2 | 2011-05-16 14:20:40 +0100 | [diff] [blame^] | 898 | parenthesized_function_ = (peek() == i::Token::FUNCTION); |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 899 | result = ParseExpression(true, CHECK_OK); |
| 900 | Expect(i::Token::RPAREN, CHECK_OK); |
| 901 | if (result == kIdentifierExpression) result = kUnknownExpression; |
| 902 | break; |
| 903 | |
| 904 | case i::Token::MOD: |
| 905 | result = ParseV8Intrinsic(CHECK_OK); |
| 906 | break; |
| 907 | |
| 908 | default: { |
| 909 | Next(); |
| 910 | *ok = false; |
| 911 | return kUnknownExpression; |
| 912 | } |
| 913 | } |
| 914 | |
| 915 | return result; |
| 916 | } |
| 917 | |
| 918 | |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 919 | PreParser::Expression PreParser::ParseArrayLiteral(bool* ok) { |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 920 | // ArrayLiteral :: |
| 921 | // '[' Expression? (',' Expression?)* ']' |
| 922 | Expect(i::Token::LBRACK, CHECK_OK); |
| 923 | while (peek() != i::Token::RBRACK) { |
| 924 | if (peek() != i::Token::COMMA) { |
| 925 | ParseAssignmentExpression(true, CHECK_OK); |
| 926 | } |
| 927 | if (peek() != i::Token::RBRACK) { |
| 928 | Expect(i::Token::COMMA, CHECK_OK); |
| 929 | } |
| 930 | } |
| 931 | Expect(i::Token::RBRACK, CHECK_OK); |
| 932 | |
| 933 | scope_->NextMaterializedLiteralIndex(); |
| 934 | return kUnknownExpression; |
| 935 | } |
| 936 | |
| 937 | |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 938 | PreParser::Expression PreParser::ParseObjectLiteral(bool* ok) { |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 939 | // ObjectLiteral :: |
| 940 | // '{' ( |
| 941 | // ((IdentifierName | String | Number) ':' AssignmentExpression) |
| 942 | // | (('get' | 'set') (IdentifierName | String | Number) FunctionLiteral) |
| 943 | // )*[','] '}' |
| 944 | |
| 945 | Expect(i::Token::LBRACE, CHECK_OK); |
| 946 | while (peek() != i::Token::RBRACE) { |
| 947 | i::Token::Value next = peek(); |
| 948 | switch (next) { |
| 949 | case i::Token::IDENTIFIER: { |
| 950 | bool is_getter = false; |
| 951 | bool is_setter = false; |
| 952 | ParseIdentifierOrGetOrSet(&is_getter, &is_setter, CHECK_OK); |
| 953 | if ((is_getter || is_setter) && peek() != i::Token::COLON) { |
| 954 | i::Token::Value name = Next(); |
Steve Block | 9fac840 | 2011-05-12 15:51:54 +0100 | [diff] [blame] | 955 | bool is_keyword = i::Token::IsKeyword(name); |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 956 | if (name != i::Token::IDENTIFIER && |
| 957 | name != i::Token::NUMBER && |
| 958 | name != i::Token::STRING && |
Steve Block | 9fac840 | 2011-05-12 15:51:54 +0100 | [diff] [blame] | 959 | !is_keyword) { |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 960 | *ok = false; |
| 961 | return kUnknownExpression; |
| 962 | } |
Steve Block | 9fac840 | 2011-05-12 15:51:54 +0100 | [diff] [blame] | 963 | if (!is_keyword) { |
| 964 | LogSymbol(); |
| 965 | } |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 966 | ParseFunctionLiteral(CHECK_OK); |
| 967 | if (peek() != i::Token::RBRACE) { |
| 968 | Expect(i::Token::COMMA, CHECK_OK); |
| 969 | } |
| 970 | continue; // restart the while |
| 971 | } |
| 972 | break; |
| 973 | } |
| 974 | case i::Token::STRING: |
| 975 | Consume(next); |
| 976 | GetStringSymbol(); |
| 977 | break; |
| 978 | case i::Token::NUMBER: |
| 979 | Consume(next); |
| 980 | break; |
| 981 | default: |
| 982 | if (i::Token::IsKeyword(next)) { |
| 983 | Consume(next); |
| 984 | } else { |
| 985 | // Unexpected token. |
| 986 | *ok = false; |
| 987 | return kUnknownExpression; |
| 988 | } |
| 989 | } |
| 990 | |
| 991 | Expect(i::Token::COLON, CHECK_OK); |
| 992 | ParseAssignmentExpression(true, CHECK_OK); |
| 993 | |
| 994 | // TODO(1240767): Consider allowing trailing comma. |
| 995 | if (peek() != i::Token::RBRACE) Expect(i::Token::COMMA, CHECK_OK); |
| 996 | } |
| 997 | Expect(i::Token::RBRACE, CHECK_OK); |
| 998 | |
| 999 | scope_->NextMaterializedLiteralIndex(); |
| 1000 | return kUnknownExpression; |
| 1001 | } |
| 1002 | |
| 1003 | |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 1004 | PreParser::Expression PreParser::ParseRegExpLiteral(bool seen_equal, |
| 1005 | bool* ok) { |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 1006 | if (!scanner_->ScanRegExpPattern(seen_equal)) { |
| 1007 | Next(); |
| 1008 | i::JavaScriptScanner::Location location = scanner_->location(); |
| 1009 | ReportMessageAt(location.beg_pos, location.end_pos, |
| 1010 | "unterminated_regexp", NULL); |
| 1011 | *ok = false; |
| 1012 | return kUnknownExpression; |
| 1013 | } |
| 1014 | |
| 1015 | scope_->NextMaterializedLiteralIndex(); |
| 1016 | |
| 1017 | if (!scanner_->ScanRegExpFlags()) { |
| 1018 | Next(); |
| 1019 | i::JavaScriptScanner::Location location = scanner_->location(); |
| 1020 | ReportMessageAt(location.beg_pos, location.end_pos, |
| 1021 | "invalid_regexp_flags", NULL); |
| 1022 | *ok = false; |
| 1023 | return kUnknownExpression; |
| 1024 | } |
| 1025 | Next(); |
| 1026 | return kUnknownExpression; |
| 1027 | } |
| 1028 | |
| 1029 | |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 1030 | PreParser::Arguments PreParser::ParseArguments(bool* ok) { |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 1031 | // Arguments :: |
| 1032 | // '(' (AssignmentExpression)*[','] ')' |
| 1033 | |
| 1034 | Expect(i::Token::LPAREN, CHECK_OK); |
| 1035 | bool done = (peek() == i::Token::RPAREN); |
| 1036 | int argc = 0; |
| 1037 | while (!done) { |
| 1038 | ParseAssignmentExpression(true, CHECK_OK); |
| 1039 | argc++; |
| 1040 | done = (peek() == i::Token::RPAREN); |
| 1041 | if (!done) Expect(i::Token::COMMA, CHECK_OK); |
| 1042 | } |
| 1043 | Expect(i::Token::RPAREN, CHECK_OK); |
| 1044 | return argc; |
| 1045 | } |
| 1046 | |
| 1047 | |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 1048 | PreParser::Expression PreParser::ParseFunctionLiteral(bool* ok) { |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 1049 | // Function :: |
| 1050 | // '(' FormalParameterList? ')' '{' FunctionBody '}' |
| 1051 | |
| 1052 | // Parse function body. |
| 1053 | ScopeType outer_scope_type = scope_->type(); |
| 1054 | bool inside_with = scope_->IsInsideWith(); |
| 1055 | Scope function_scope(&scope_, kFunctionScope); |
| 1056 | |
| 1057 | // FormalParameterList :: |
| 1058 | // '(' (Identifier)*[','] ')' |
| 1059 | Expect(i::Token::LPAREN, CHECK_OK); |
| 1060 | bool done = (peek() == i::Token::RPAREN); |
| 1061 | while (!done) { |
| 1062 | ParseIdentifier(CHECK_OK); |
| 1063 | done = (peek() == i::Token::RPAREN); |
| 1064 | if (!done) { |
| 1065 | Expect(i::Token::COMMA, CHECK_OK); |
| 1066 | } |
| 1067 | } |
| 1068 | Expect(i::Token::RPAREN, CHECK_OK); |
| 1069 | |
| 1070 | Expect(i::Token::LBRACE, CHECK_OK); |
| 1071 | int function_block_pos = scanner_->location().beg_pos; |
| 1072 | |
| 1073 | // Determine if the function will be lazily compiled. |
| 1074 | // Currently only happens to top-level functions. |
| 1075 | // Optimistically assume that all top-level functions are lazily compiled. |
Ben Murdoch | b8e0da2 | 2011-05-16 14:20:40 +0100 | [diff] [blame^] | 1076 | bool is_lazily_compiled = (outer_scope_type == kTopLevelScope && |
| 1077 | !inside_with && allow_lazy_ && |
| 1078 | !parenthesized_function_); |
| 1079 | parenthesized_function_ = false; |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 1080 | |
| 1081 | if (is_lazily_compiled) { |
| 1082 | log_->PauseRecording(); |
| 1083 | ParseSourceElements(i::Token::RBRACE, ok); |
| 1084 | log_->ResumeRecording(); |
| 1085 | if (!*ok) return kUnknownExpression; |
| 1086 | |
| 1087 | Expect(i::Token::RBRACE, CHECK_OK); |
| 1088 | |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 1089 | // Position right after terminal '}'. |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 1090 | int end_pos = scanner_->location().end_pos; |
| 1091 | log_->LogFunction(function_block_pos, end_pos, |
| 1092 | function_scope.materialized_literal_count(), |
| 1093 | function_scope.expected_properties()); |
| 1094 | } else { |
| 1095 | ParseSourceElements(i::Token::RBRACE, CHECK_OK); |
| 1096 | Expect(i::Token::RBRACE, CHECK_OK); |
| 1097 | } |
| 1098 | return kUnknownExpression; |
| 1099 | } |
| 1100 | |
| 1101 | |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 1102 | PreParser::Expression PreParser::ParseV8Intrinsic(bool* ok) { |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 1103 | // CallRuntime :: |
| 1104 | // '%' Identifier Arguments |
| 1105 | |
| 1106 | Expect(i::Token::MOD, CHECK_OK); |
| 1107 | ParseIdentifier(CHECK_OK); |
| 1108 | ParseArguments(CHECK_OK); |
| 1109 | |
| 1110 | return kUnknownExpression; |
| 1111 | } |
| 1112 | |
| 1113 | |
| 1114 | void PreParser::ExpectSemicolon(bool* ok) { |
| 1115 | // Check for automatic semicolon insertion according to |
| 1116 | // the rules given in ECMA-262, section 7.9, page 21. |
| 1117 | i::Token::Value tok = peek(); |
| 1118 | if (tok == i::Token::SEMICOLON) { |
| 1119 | Next(); |
| 1120 | return; |
| 1121 | } |
| 1122 | if (scanner_->has_line_terminator_before_next() || |
| 1123 | tok == i::Token::RBRACE || |
| 1124 | tok == i::Token::EOS) { |
| 1125 | return; |
| 1126 | } |
| 1127 | Expect(i::Token::SEMICOLON, ok); |
| 1128 | } |
| 1129 | |
| 1130 | |
Steve Block | 9fac840 | 2011-05-12 15:51:54 +0100 | [diff] [blame] | 1131 | void PreParser::LogSymbol() { |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 1132 | int identifier_pos = scanner_->location().beg_pos; |
Steve Block | 9fac840 | 2011-05-12 15:51:54 +0100 | [diff] [blame] | 1133 | if (scanner_->is_literal_ascii()) { |
| 1134 | log_->LogAsciiSymbol(identifier_pos, scanner_->literal_ascii_string()); |
| 1135 | } else { |
| 1136 | log_->LogUC16Symbol(identifier_pos, scanner_->literal_uc16_string()); |
| 1137 | } |
| 1138 | } |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 1139 | |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 1140 | |
Steve Block | 9fac840 | 2011-05-12 15:51:54 +0100 | [diff] [blame] | 1141 | PreParser::Identifier PreParser::GetIdentifierSymbol() { |
| 1142 | LogSymbol(); |
| 1143 | return kUnknownIdentifier; |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 1144 | } |
| 1145 | |
| 1146 | |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 1147 | PreParser::Expression PreParser::GetStringSymbol() { |
Steve Block | 9fac840 | 2011-05-12 15:51:54 +0100 | [diff] [blame] | 1148 | LogSymbol(); |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 1149 | return kUnknownExpression; |
| 1150 | } |
| 1151 | |
| 1152 | |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 1153 | PreParser::Identifier PreParser::ParseIdentifier(bool* ok) { |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 1154 | Expect(i::Token::IDENTIFIER, ok); |
| 1155 | if (!*ok) return kUnknownIdentifier; |
| 1156 | return GetIdentifierSymbol(); |
| 1157 | } |
| 1158 | |
| 1159 | |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 1160 | PreParser::Identifier PreParser::ParseIdentifierName(bool* ok) { |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 1161 | i::Token::Value next = Next(); |
| 1162 | if (i::Token::IsKeyword(next)) { |
| 1163 | int pos = scanner_->location().beg_pos; |
| 1164 | const char* keyword = i::Token::String(next); |
Steve Block | 9fac840 | 2011-05-12 15:51:54 +0100 | [diff] [blame] | 1165 | log_->LogAsciiSymbol(pos, i::Vector<const char>(keyword, |
| 1166 | i::StrLength(keyword))); |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 1167 | return kUnknownExpression; |
| 1168 | } |
| 1169 | if (next == i::Token::IDENTIFIER) { |
| 1170 | return GetIdentifierSymbol(); |
| 1171 | } |
| 1172 | *ok = false; |
| 1173 | return kUnknownIdentifier; |
| 1174 | } |
| 1175 | |
| 1176 | |
| 1177 | // This function reads an identifier and determines whether or not it |
| 1178 | // is 'get' or 'set'. The reason for not using ParseIdentifier and |
| 1179 | // checking on the output is that this involves heap allocation which |
| 1180 | // we can't do during preparsing. |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 1181 | PreParser::Identifier PreParser::ParseIdentifierOrGetOrSet(bool* is_get, |
| 1182 | bool* is_set, |
| 1183 | bool* ok) { |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 1184 | Expect(i::Token::IDENTIFIER, CHECK_OK); |
Steve Block | 9fac840 | 2011-05-12 15:51:54 +0100 | [diff] [blame] | 1185 | if (scanner_->is_literal_ascii() && scanner_->literal_length() == 3) { |
| 1186 | const char* token = scanner_->literal_ascii_string().start(); |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 1187 | *is_get = strncmp(token, "get", 3) == 0; |
| 1188 | *is_set = !*is_get && strncmp(token, "set", 3) == 0; |
| 1189 | } |
| 1190 | return GetIdentifierSymbol(); |
| 1191 | } |
| 1192 | |
| 1193 | #undef CHECK_OK |
| 1194 | } } // v8::preparser |