christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1 | // Copyright 2006-2008 Google Inc. All Rights Reserved. |
| 2 | // Redistribution and use in source and binary forms, with or without |
| 3 | // modification, are permitted provided that the following conditions are |
| 4 | // met: |
| 5 | // |
| 6 | // * Redistributions of source code must retain the above copyright |
| 7 | // notice, this list of conditions and the following disclaimer. |
| 8 | // * Redistributions in binary form must reproduce the above |
| 9 | // copyright notice, this list of conditions and the following |
| 10 | // disclaimer in the documentation and/or other materials provided |
| 11 | // with the distribution. |
| 12 | // * Neither the name of Google Inc. nor the names of its |
| 13 | // contributors may be used to endorse or promote products derived |
| 14 | // from this software without specific prior written permission. |
| 15 | // |
| 16 | // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 17 | // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 18 | // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 19 | // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 20 | // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 21 | // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 22 | // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 23 | // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 24 | // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 25 | // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 26 | // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 27 | |
| 28 | #ifndef V8_AST_H_ |
| 29 | #define V8_AST_H_ |
| 30 | |
| 31 | #include "execution.h" |
| 32 | #include "factory.h" |
| 33 | #include "runtime.h" |
| 34 | #include "token.h" |
| 35 | #include "variables.h" |
| 36 | #include "macro-assembler.h" |
| 37 | |
| 38 | namespace v8 { namespace internal { |
| 39 | |
| 40 | // The abstract syntax tree is an intermediate, light-weight |
| 41 | // representation of the parsed JavaScript code suitable for |
| 42 | // compilation to native code. |
| 43 | |
| 44 | // Nodes are allocated in a separate zone, which allows faster |
| 45 | // allocation and constant-time deallocation of the entire syntax |
| 46 | // tree. |
| 47 | |
| 48 | |
| 49 | // ---------------------------------------------------------------------------- |
| 50 | // Nodes of the abstract syntax tree. Only concrete classes are |
| 51 | // enumerated here. |
| 52 | |
| 53 | #define NODE_LIST(V) \ |
| 54 | V(Block) \ |
| 55 | V(Declaration) \ |
| 56 | V(ExpressionStatement) \ |
| 57 | V(EmptyStatement) \ |
| 58 | V(IfStatement) \ |
| 59 | V(ContinueStatement) \ |
| 60 | V(BreakStatement) \ |
| 61 | V(ReturnStatement) \ |
| 62 | V(WithEnterStatement) \ |
| 63 | V(WithExitStatement) \ |
| 64 | V(SwitchStatement) \ |
| 65 | V(LoopStatement) \ |
| 66 | V(ForInStatement) \ |
| 67 | V(TryCatch) \ |
| 68 | V(TryFinally) \ |
| 69 | V(DebuggerStatement) \ |
| 70 | V(FunctionLiteral) \ |
| 71 | V(FunctionBoilerplateLiteral) \ |
| 72 | V(Conditional) \ |
| 73 | V(Slot) \ |
| 74 | V(VariableProxy) \ |
| 75 | V(Literal) \ |
| 76 | V(RegExpLiteral) \ |
| 77 | V(ObjectLiteral) \ |
| 78 | V(ArrayLiteral) \ |
| 79 | V(Assignment) \ |
| 80 | V(Throw) \ |
| 81 | V(Property) \ |
| 82 | V(Call) \ |
| 83 | V(CallNew) \ |
| 84 | V(CallRuntime) \ |
| 85 | V(UnaryOperation) \ |
| 86 | V(CountOperation) \ |
| 87 | V(BinaryOperation) \ |
| 88 | V(CompareOperation) \ |
| 89 | V(ThisFunction) |
| 90 | |
| 91 | |
| 92 | #define DEF_FORWARD_DECLARATION(type) class type; |
| 93 | NODE_LIST(DEF_FORWARD_DECLARATION) |
| 94 | #undef DEF_FORWARD_DECLARATION |
| 95 | |
| 96 | |
| 97 | // Typedef only introduced to avoid unreadable code. |
| 98 | // Please do appreciate the required space in "> >". |
| 99 | typedef ZoneList<Handle<String> > ZoneStringList; |
| 100 | |
| 101 | |
| 102 | class Node: public ZoneObject { |
| 103 | public: |
| 104 | Node(): statement_pos_(kNoPosition) { } |
| 105 | virtual ~Node() { } |
| 106 | virtual void Accept(Visitor* v) = 0; |
| 107 | |
| 108 | // Type testing & conversion. |
| 109 | virtual Statement* AsStatement() { return NULL; } |
| 110 | virtual ExpressionStatement* AsExpressionStatement() { return NULL; } |
| 111 | virtual EmptyStatement* AsEmptyStatement() { return NULL; } |
| 112 | virtual Expression* AsExpression() { return NULL; } |
| 113 | virtual Literal* AsLiteral() { return NULL; } |
| 114 | virtual Slot* AsSlot() { return NULL; } |
| 115 | virtual VariableProxy* AsVariableProxy() { return NULL; } |
| 116 | virtual Property* AsProperty() { return NULL; } |
| 117 | virtual Call* AsCall() { return NULL; } |
| 118 | virtual LabelCollector* AsLabelCollector() { return NULL; } |
| 119 | virtual BreakableStatement* AsBreakableStatement() { return NULL; } |
| 120 | virtual IterationStatement* AsIterationStatement() { return NULL; } |
| 121 | virtual UnaryOperation* AsUnaryOperation() { return NULL; } |
| 122 | virtual BinaryOperation* AsBinaryOperation() { return NULL; } |
| 123 | virtual Assignment* AsAssignment() { return NULL; } |
| 124 | virtual FunctionLiteral* AsFunctionLiteral() { return NULL; } |
| 125 | |
| 126 | void set_statement_pos(int statement_pos) { statement_pos_ = statement_pos; } |
| 127 | int statement_pos() const { return statement_pos_; } |
| 128 | |
| 129 | private: |
| 130 | int statement_pos_; |
| 131 | }; |
| 132 | |
| 133 | |
| 134 | class Statement: public Node { |
| 135 | public: |
| 136 | virtual Statement* AsStatement() { return this; } |
| 137 | virtual ReturnStatement* AsReturnStatement() { return NULL; } |
| 138 | |
| 139 | bool IsEmpty() { return AsEmptyStatement() != NULL; } |
| 140 | }; |
| 141 | |
| 142 | |
| 143 | class Expression: public Node { |
| 144 | public: |
| 145 | virtual Expression* AsExpression() { return this; } |
| 146 | |
| 147 | virtual bool IsValidLeftHandSide() { return false; } |
| 148 | |
| 149 | // Mark the expression as being compiled as an expression |
| 150 | // statement. This is used to transform postfix increments to |
| 151 | // (faster) prefix increments. |
| 152 | virtual void MarkAsStatement() { /* do nothing */ } |
| 153 | }; |
| 154 | |
| 155 | |
| 156 | /** |
| 157 | * A sentinel used during pre parsing that represents some expression |
| 158 | * that is a valid left hand side without having to actually build |
| 159 | * the expression. |
| 160 | */ |
| 161 | class ValidLeftHandSideSentinel: public Expression { |
| 162 | public: |
| 163 | virtual bool IsValidLeftHandSide() { return true; } |
| 164 | virtual void Accept(Visitor* v) { UNREACHABLE(); } |
| 165 | static ValidLeftHandSideSentinel* instance() { return &instance_; } |
| 166 | private: |
| 167 | static ValidLeftHandSideSentinel instance_; |
| 168 | }; |
| 169 | |
| 170 | |
| 171 | class BreakableStatement: public Statement { |
| 172 | public: |
| 173 | enum Type { |
| 174 | TARGET_FOR_ANONYMOUS, |
| 175 | TARGET_FOR_NAMED_ONLY |
| 176 | }; |
| 177 | |
| 178 | // The labels associated with this statement. May be NULL; |
| 179 | // if it is != NULL, guaranteed to contain at least one entry. |
| 180 | ZoneStringList* labels() const { return labels_; } |
| 181 | |
| 182 | // Type testing & conversion. |
| 183 | virtual BreakableStatement* AsBreakableStatement() { return this; } |
| 184 | |
| 185 | // Code generation |
| 186 | Label* break_target() { return &break_target_; } |
| 187 | |
| 188 | // Used during code generation for restoring the stack when a |
| 189 | // break/continue crosses a statement that keeps stuff on the stack. |
| 190 | int break_stack_height() { return break_stack_height_; } |
| 191 | void set_break_stack_height(int height) { break_stack_height_ = height; } |
| 192 | |
| 193 | // Testers. |
| 194 | bool is_target_for_anonymous() const { return type_ == TARGET_FOR_ANONYMOUS; } |
| 195 | |
| 196 | protected: |
| 197 | BreakableStatement(ZoneStringList* labels, Type type) |
| 198 | : labels_(labels), type_(type) { |
| 199 | ASSERT(labels == NULL || labels->length() > 0); |
| 200 | } |
| 201 | |
| 202 | private: |
| 203 | ZoneStringList* labels_; |
| 204 | Type type_; |
| 205 | Label break_target_; |
| 206 | int break_stack_height_; |
| 207 | }; |
| 208 | |
| 209 | |
| 210 | class Block: public BreakableStatement { |
| 211 | public: |
| 212 | Block(ZoneStringList* labels, int capacity, bool is_initializer_block) |
| 213 | : BreakableStatement(labels, TARGET_FOR_NAMED_ONLY), |
| 214 | statements_(capacity), |
| 215 | is_initializer_block_(is_initializer_block) { } |
| 216 | |
| 217 | virtual void Accept(Visitor* v); |
| 218 | |
| 219 | void AddStatement(Statement* statement) { statements_.Add(statement); } |
| 220 | |
| 221 | ZoneList<Statement*>* statements() { return &statements_; } |
| 222 | bool is_initializer_block() const { return is_initializer_block_; } |
| 223 | |
| 224 | private: |
| 225 | ZoneList<Statement*> statements_; |
| 226 | bool is_initializer_block_; |
| 227 | }; |
| 228 | |
| 229 | |
| 230 | class Declaration: public Node { |
| 231 | public: |
| 232 | Declaration(VariableProxy* proxy, Variable::Mode mode, FunctionLiteral* fun) |
| 233 | : proxy_(proxy), |
| 234 | mode_(mode), |
| 235 | fun_(fun) { |
| 236 | ASSERT(mode == Variable::VAR || mode == Variable::CONST); |
| 237 | // At the moment there are no "const functions"'s in JavaScript... |
| 238 | ASSERT(fun == NULL || mode == Variable::VAR); |
| 239 | } |
| 240 | |
| 241 | virtual void Accept(Visitor* v); |
| 242 | |
| 243 | VariableProxy* proxy() const { return proxy_; } |
| 244 | Variable::Mode mode() const { return mode_; } |
| 245 | FunctionLiteral* fun() const { return fun_; } // may be NULL |
| 246 | |
| 247 | private: |
| 248 | VariableProxy* proxy_; |
| 249 | Variable::Mode mode_; |
| 250 | FunctionLiteral* fun_; |
| 251 | }; |
| 252 | |
| 253 | |
| 254 | class IterationStatement: public BreakableStatement { |
| 255 | public: |
| 256 | // Type testing & conversion. |
| 257 | virtual IterationStatement* AsIterationStatement() { return this; } |
| 258 | |
| 259 | Statement* body() const { return body_; } |
| 260 | |
| 261 | // Code generation |
| 262 | Label* continue_target() { return &continue_target_; } |
| 263 | |
| 264 | protected: |
| 265 | explicit IterationStatement(ZoneStringList* labels) |
| 266 | : BreakableStatement(labels, TARGET_FOR_ANONYMOUS), body_(NULL) { } |
| 267 | |
| 268 | void Initialize(Statement* body) { |
| 269 | body_ = body; |
| 270 | } |
| 271 | |
| 272 | private: |
| 273 | Statement* body_; |
| 274 | Label continue_target_; |
| 275 | }; |
| 276 | |
| 277 | |
| 278 | class LoopStatement: public IterationStatement { |
| 279 | public: |
| 280 | enum Type { DO_LOOP, FOR_LOOP, WHILE_LOOP }; |
| 281 | |
| 282 | LoopStatement(ZoneStringList* labels, Type type) |
| 283 | : IterationStatement(labels), type_(type), init_(NULL), |
| 284 | cond_(NULL), next_(NULL) { } |
| 285 | |
| 286 | void Initialize(Statement* init, |
| 287 | Expression* cond, |
| 288 | Statement* next, |
| 289 | Statement* body) { |
| 290 | ASSERT(init == NULL || type_ == FOR_LOOP); |
| 291 | ASSERT(next == NULL || type_ == FOR_LOOP); |
| 292 | IterationStatement::Initialize(body); |
| 293 | init_ = init; |
| 294 | cond_ = cond; |
| 295 | next_ = next; |
| 296 | } |
| 297 | |
| 298 | virtual void Accept(Visitor* v); |
| 299 | |
| 300 | Type type() const { return type_; } |
| 301 | Statement* init() const { return init_; } |
| 302 | Expression* cond() const { return cond_; } |
| 303 | Statement* next() const { return next_; } |
| 304 | |
| 305 | #ifdef DEBUG |
| 306 | const char* OperatorString() const; |
| 307 | #endif |
| 308 | |
| 309 | private: |
| 310 | Type type_; |
| 311 | Statement* init_; |
| 312 | Expression* cond_; |
| 313 | Statement* next_; |
| 314 | }; |
| 315 | |
| 316 | |
| 317 | class ForInStatement: public IterationStatement { |
| 318 | public: |
| 319 | explicit ForInStatement(ZoneStringList* labels) |
| 320 | : IterationStatement(labels), each_(NULL), enumerable_(NULL) { } |
| 321 | |
| 322 | void Initialize(Expression* each, Expression* enumerable, Statement* body) { |
| 323 | IterationStatement::Initialize(body); |
| 324 | each_ = each; |
| 325 | enumerable_ = enumerable; |
| 326 | } |
| 327 | |
| 328 | virtual void Accept(Visitor* v); |
| 329 | |
| 330 | Expression* each() const { return each_; } |
| 331 | Expression* enumerable() const { return enumerable_; } |
| 332 | |
| 333 | private: |
| 334 | Expression* each_; |
| 335 | Expression* enumerable_; |
| 336 | }; |
| 337 | |
| 338 | |
| 339 | class ExpressionStatement: public Statement { |
| 340 | public: |
| 341 | explicit ExpressionStatement(Expression* expression) |
| 342 | : expression_(expression) { } |
| 343 | |
| 344 | virtual void Accept(Visitor* v); |
| 345 | |
| 346 | // Type testing & conversion. |
| 347 | virtual ExpressionStatement* AsExpressionStatement() { return this; } |
| 348 | |
| 349 | void set_expression(Expression* e) { expression_ = e; } |
| 350 | Expression* expression() { return expression_; } |
| 351 | |
| 352 | private: |
| 353 | Expression* expression_; |
| 354 | }; |
| 355 | |
| 356 | |
| 357 | class ContinueStatement: public Statement { |
| 358 | public: |
| 359 | explicit ContinueStatement(IterationStatement* target) |
| 360 | : target_(target) { } |
| 361 | |
| 362 | virtual void Accept(Visitor* v); |
| 363 | |
| 364 | IterationStatement* target() const { return target_; } |
| 365 | |
| 366 | private: |
| 367 | IterationStatement* target_; |
| 368 | }; |
| 369 | |
| 370 | |
| 371 | class BreakStatement: public Statement { |
| 372 | public: |
| 373 | explicit BreakStatement(BreakableStatement* target) |
| 374 | : target_(target) { } |
| 375 | |
| 376 | virtual void Accept(Visitor* v); |
| 377 | |
| 378 | BreakableStatement* target() const { return target_; } |
| 379 | |
| 380 | private: |
| 381 | BreakableStatement* target_; |
| 382 | }; |
| 383 | |
| 384 | |
| 385 | class ReturnStatement: public Statement { |
| 386 | public: |
| 387 | explicit ReturnStatement(Expression* expression) |
| 388 | : expression_(expression) { } |
| 389 | |
| 390 | virtual void Accept(Visitor* v); |
| 391 | |
| 392 | // Type testing & conversion. |
| 393 | virtual ReturnStatement* AsReturnStatement() { return this; } |
| 394 | |
| 395 | Expression* expression() { return expression_; } |
| 396 | |
| 397 | private: |
| 398 | Expression* expression_; |
| 399 | }; |
| 400 | |
| 401 | |
| 402 | class WithEnterStatement: public Statement { |
| 403 | public: |
| 404 | explicit WithEnterStatement(Expression* expression) |
| 405 | : expression_(expression) { } |
| 406 | |
| 407 | virtual void Accept(Visitor* v); |
| 408 | |
| 409 | Expression* expression() const { return expression_; } |
| 410 | |
| 411 | private: |
| 412 | Expression* expression_; |
| 413 | }; |
| 414 | |
| 415 | |
| 416 | class WithExitStatement: public Statement { |
| 417 | public: |
| 418 | WithExitStatement() { } |
| 419 | |
| 420 | virtual void Accept(Visitor* v); |
| 421 | }; |
| 422 | |
| 423 | |
| 424 | class CaseClause: public ZoneObject { |
| 425 | public: |
| 426 | CaseClause(Expression* label, ZoneList<Statement*>* statements) |
| 427 | : label_(label), statements_(statements) { } |
| 428 | |
| 429 | bool is_default() const { return label_ == NULL; } |
| 430 | Expression* label() const { |
| 431 | CHECK(!is_default()); |
| 432 | return label_; |
| 433 | } |
| 434 | ZoneList<Statement*>* statements() const { return statements_; } |
| 435 | |
| 436 | private: |
| 437 | Expression* label_; |
| 438 | ZoneList<Statement*>* statements_; |
| 439 | }; |
| 440 | |
| 441 | |
| 442 | class SwitchStatement: public BreakableStatement { |
| 443 | public: |
| 444 | explicit SwitchStatement(ZoneStringList* labels) |
| 445 | : BreakableStatement(labels, TARGET_FOR_ANONYMOUS), |
| 446 | tag_(NULL), cases_(NULL) { } |
| 447 | |
| 448 | void Initialize(Expression* tag, ZoneList<CaseClause*>* cases) { |
| 449 | tag_ = tag; |
| 450 | cases_ = cases; |
| 451 | } |
| 452 | |
| 453 | virtual void Accept(Visitor* v); |
| 454 | |
| 455 | Expression* tag() const { return tag_; } |
| 456 | ZoneList<CaseClause*>* cases() const { return cases_; } |
| 457 | |
| 458 | private: |
| 459 | Expression* tag_; |
| 460 | ZoneList<CaseClause*>* cases_; |
| 461 | }; |
| 462 | |
| 463 | |
| 464 | // If-statements always have non-null references to their then- and |
| 465 | // else-parts. When parsing if-statements with no explicit else-part, |
| 466 | // the parser implicitly creates an empty statement. Use the |
| 467 | // HasThenStatement() and HasElseStatement() functions to check if a |
| 468 | // given if-statement has a then- or an else-part containing code. |
| 469 | class IfStatement: public Statement { |
| 470 | public: |
| 471 | IfStatement(Expression* condition, |
| 472 | Statement* then_statement, |
| 473 | Statement* else_statement) |
| 474 | : condition_(condition), |
| 475 | then_statement_(then_statement), |
| 476 | else_statement_(else_statement) { } |
| 477 | |
| 478 | virtual void Accept(Visitor* v); |
| 479 | |
| 480 | bool HasThenStatement() const { return !then_statement()->IsEmpty(); } |
| 481 | bool HasElseStatement() const { return !else_statement()->IsEmpty(); } |
| 482 | |
| 483 | Expression* condition() const { return condition_; } |
| 484 | Statement* then_statement() const { return then_statement_; } |
| 485 | Statement* else_statement() const { return else_statement_; } |
| 486 | |
| 487 | private: |
| 488 | Expression* condition_; |
| 489 | Statement* then_statement_; |
| 490 | Statement* else_statement_; |
| 491 | }; |
| 492 | |
| 493 | |
| 494 | // NOTE: LabelCollectors are represented as nodes to fit in the target |
| 495 | // stack in the compiler; this should probably be reworked. |
| 496 | class LabelCollector: public Node { |
| 497 | public: |
| 498 | explicit LabelCollector(ZoneList<Label*>* labels) : labels_(labels) { } |
| 499 | |
| 500 | // Adds a label to the collector. The collector stores a pointer not |
| 501 | // a copy of the label to make binding work, so make sure not to |
| 502 | // pass in references to something on the stack. |
| 503 | void AddLabel(Label* label); |
| 504 | |
| 505 | // Virtual behaviour. LabelCollectors are never part of the AST. |
| 506 | virtual void Accept(Visitor* v) { UNREACHABLE(); } |
| 507 | virtual LabelCollector* AsLabelCollector() { return this; } |
| 508 | |
| 509 | ZoneList<Label*>* labels() { return labels_; } |
| 510 | |
| 511 | private: |
| 512 | ZoneList<Label*>* labels_; |
| 513 | }; |
| 514 | |
| 515 | |
| 516 | class TryStatement: public Statement { |
| 517 | public: |
| 518 | explicit TryStatement(Block* try_block) |
| 519 | : try_block_(try_block), escaping_labels_(NULL) { } |
| 520 | |
| 521 | void set_escaping_labels(ZoneList<Label*>* labels) { |
| 522 | escaping_labels_ = labels; |
| 523 | } |
| 524 | |
| 525 | Block* try_block() const { return try_block_; } |
| 526 | ZoneList<Label*>* escaping_labels() const { return escaping_labels_; } |
| 527 | |
| 528 | private: |
| 529 | Block* try_block_; |
| 530 | ZoneList<Label*>* escaping_labels_; |
| 531 | }; |
| 532 | |
| 533 | |
| 534 | class TryCatch: public TryStatement { |
| 535 | public: |
| 536 | TryCatch(Block* try_block, Expression* catch_var, Block* catch_block) |
| 537 | : TryStatement(try_block), |
| 538 | catch_var_(catch_var), |
| 539 | catch_block_(catch_block) { |
| 540 | ASSERT(catch_var->AsVariableProxy() != NULL); |
| 541 | } |
| 542 | |
| 543 | virtual void Accept(Visitor* v); |
| 544 | |
| 545 | Expression* catch_var() const { return catch_var_; } |
| 546 | Block* catch_block() const { return catch_block_; } |
| 547 | |
| 548 | private: |
| 549 | Expression* catch_var_; |
| 550 | Block* catch_block_; |
| 551 | }; |
| 552 | |
| 553 | |
| 554 | class TryFinally: public TryStatement { |
| 555 | public: |
| 556 | TryFinally(Block* try_block, Expression* finally_var, Block* finally_block) |
| 557 | : TryStatement(try_block), |
| 558 | finally_var_(finally_var), |
| 559 | finally_block_(finally_block) { } |
| 560 | |
| 561 | virtual void Accept(Visitor* v); |
| 562 | |
| 563 | // If the finally block is non-trivial it may be problematic to have |
| 564 | // extra stuff on the expression stack while evaluating it. The |
| 565 | // finally variable is used to hold the state instead of storing it |
| 566 | // on the stack. It may be NULL in which case the state is stored on |
| 567 | // the stack. |
| 568 | Expression* finally_var() const { return finally_var_; } |
| 569 | |
| 570 | Block* finally_block() const { return finally_block_; } |
| 571 | |
| 572 | private: |
| 573 | Expression* finally_var_; |
| 574 | Block* finally_block_; |
| 575 | }; |
| 576 | |
| 577 | |
| 578 | class DebuggerStatement: public Statement { |
| 579 | public: |
| 580 | virtual void Accept(Visitor* v); |
| 581 | }; |
| 582 | |
| 583 | |
| 584 | class EmptyStatement: public Statement { |
| 585 | public: |
| 586 | virtual void Accept(Visitor* v); |
| 587 | |
| 588 | // Type testing & conversion. |
| 589 | virtual EmptyStatement* AsEmptyStatement() { return this; } |
| 590 | }; |
| 591 | |
| 592 | |
| 593 | class Literal: public Expression { |
| 594 | public: |
| 595 | explicit Literal(Handle<Object> handle) : handle_(handle) { } |
| 596 | |
| 597 | virtual void Accept(Visitor* v); |
| 598 | |
| 599 | // Type testing & conversion. |
| 600 | virtual Literal* AsLiteral() { return this; } |
| 601 | |
| 602 | // Check if this literal is identical to the other literal. |
| 603 | bool IsIdenticalTo(const Literal* other) const { |
| 604 | return handle_.is_identical_to(other->handle_); |
| 605 | } |
| 606 | |
| 607 | // Identity testers. |
| 608 | bool IsNull() const { return handle_.is_identical_to(Factory::null_value()); } |
| 609 | bool IsTrue() const { return handle_.is_identical_to(Factory::true_value()); } |
| 610 | bool IsFalse() const { |
| 611 | return handle_.is_identical_to(Factory::false_value()); |
| 612 | } |
| 613 | |
| 614 | Handle<Object> handle() const { return handle_; } |
| 615 | |
| 616 | private: |
| 617 | Handle<Object> handle_; |
| 618 | }; |
| 619 | |
| 620 | |
| 621 | // Base class for literals that needs space in the corresponding JSFunction. |
| 622 | class MaterializedLiteral: public Expression { |
| 623 | public: |
| 624 | explicit MaterializedLiteral(int literal_index) |
| 625 | : literal_index_(literal_index) {} |
| 626 | int literal_index() { return literal_index_; } |
| 627 | private: |
| 628 | int literal_index_; |
| 629 | }; |
| 630 | |
| 631 | |
| 632 | // An object literal has a boilerplate object that is used |
| 633 | // for minimizing the work when constructing it at runtime. |
| 634 | class ObjectLiteral: public MaterializedLiteral { |
| 635 | public: |
| 636 | // Property is used for passing information |
| 637 | // about an object literal's properties from the parser |
| 638 | // to the code generator. |
| 639 | class Property: public ZoneObject { |
| 640 | public: |
| 641 | |
| 642 | enum Kind { |
| 643 | CONSTANT, // Property with constant value (at compile time). |
| 644 | COMPUTED, // Property with computed value (at execution time). |
| 645 | GETTER, SETTER, // Property is an accessor function. |
| 646 | PROTOTYPE // Property is __proto__. |
| 647 | }; |
| 648 | |
| 649 | Property(Literal* key, Expression* value); |
| 650 | Property(bool is_getter, FunctionLiteral* value); |
| 651 | |
| 652 | Literal* key() { return key_; } |
| 653 | Expression* value() { return value_; } |
| 654 | Kind kind() { return kind_; } |
| 655 | |
| 656 | private: |
| 657 | Literal* key_; |
| 658 | Expression* value_; |
| 659 | Kind kind_; |
| 660 | }; |
| 661 | |
| 662 | ObjectLiteral(Handle<FixedArray> constant_properties, |
| 663 | Expression* result, |
| 664 | ZoneList<Property*>* properties, |
| 665 | int literal_index) |
| 666 | : MaterializedLiteral(literal_index), |
| 667 | constant_properties_(constant_properties), |
| 668 | result_(result), |
| 669 | properties_(properties) { |
| 670 | } |
| 671 | |
| 672 | virtual void Accept(Visitor* v); |
| 673 | |
| 674 | Handle<FixedArray> constant_properties() const { |
| 675 | return constant_properties_; |
| 676 | } |
| 677 | Expression* result() const { return result_; } |
| 678 | ZoneList<Property*>* properties() const { return properties_; } |
| 679 | |
| 680 | private: |
| 681 | Handle<FixedArray> constant_properties_; |
| 682 | Expression* result_; |
| 683 | ZoneList<Property*>* properties_; |
| 684 | }; |
| 685 | |
| 686 | |
| 687 | // Node for capturing a regexp literal. |
| 688 | class RegExpLiteral: public MaterializedLiteral { |
| 689 | public: |
| 690 | RegExpLiteral(Handle<String> pattern, |
| 691 | Handle<String> flags, |
| 692 | int literal_index) |
| 693 | : MaterializedLiteral(literal_index), |
| 694 | pattern_(pattern), |
| 695 | flags_(flags) {} |
| 696 | |
| 697 | virtual void Accept(Visitor* v); |
| 698 | |
| 699 | Handle<String> pattern() const { return pattern_; } |
| 700 | Handle<String> flags() const { return flags_; } |
| 701 | |
| 702 | private: |
| 703 | Handle<String> pattern_; |
| 704 | Handle<String> flags_; |
| 705 | }; |
| 706 | |
| 707 | // An array literal has a literals object that is used |
| 708 | // used for minimizing the work when contructing it at runtime. |
| 709 | class ArrayLiteral: public Expression { |
| 710 | public: |
| 711 | ArrayLiteral(Handle<FixedArray> literals, |
| 712 | Expression* result, |
| 713 | ZoneList<Expression*>* values) |
| 714 | : literals_(literals), result_(result), values_(values) { |
| 715 | } |
| 716 | |
| 717 | virtual void Accept(Visitor* v); |
| 718 | |
| 719 | Handle<FixedArray> literals() const { return literals_; } |
| 720 | Expression* result() const { return result_; } |
| 721 | ZoneList<Expression*>* values() const { return values_; } |
| 722 | |
| 723 | private: |
| 724 | Handle<FixedArray> literals_; |
| 725 | Expression* result_; |
| 726 | ZoneList<Expression*>* values_; |
| 727 | }; |
| 728 | |
| 729 | |
| 730 | class VariableProxy: public Expression { |
| 731 | public: |
| 732 | virtual void Accept(Visitor* v); |
| 733 | |
| 734 | // Type testing & conversion |
| 735 | virtual Property* AsProperty() { |
| 736 | return var_ == NULL ? NULL : var_->AsProperty(); |
| 737 | } |
| 738 | virtual VariableProxy* AsVariableProxy() { return this; } |
| 739 | |
| 740 | Variable* AsVariable() { |
| 741 | return this == NULL || var_ == NULL ? NULL : var_->AsVariable(); |
| 742 | } |
| 743 | virtual bool IsValidLeftHandSide() { |
| 744 | return var_ == NULL ? true : var_->IsValidLeftHandSide(); |
| 745 | } |
| 746 | bool IsVariable(Handle<String> n) { |
| 747 | return !is_this() && name().is_identical_to(n); |
| 748 | } |
| 749 | |
| 750 | // If this assertion fails it means that some code has tried to |
| 751 | // treat the special "this" variable as an ordinary variable with |
| 752 | // the name "this". |
| 753 | Handle<String> name() const { return name_; } |
| 754 | Variable* var() const { return var_; } |
| 755 | UseCount* var_uses() { return &var_uses_; } |
| 756 | UseCount* obj_uses() { return &obj_uses_; } |
| 757 | bool is_this() const { return is_this_; } |
| 758 | bool inside_with() const { return inside_with_; } |
| 759 | |
| 760 | // Bind this proxy to the variable var. |
| 761 | void BindTo(Variable* var); |
| 762 | |
| 763 | protected: |
| 764 | Handle<String> name_; |
| 765 | Variable* var_; // resolved variable, or NULL |
| 766 | bool is_this_; |
| 767 | bool inside_with_; |
| 768 | |
| 769 | // VariableProxy usage info. |
| 770 | UseCount var_uses_; // uses of the variable value |
| 771 | UseCount obj_uses_; // uses of the object the variable points to |
| 772 | |
| 773 | VariableProxy(Handle<String> name, bool is_this, bool inside_with); |
| 774 | explicit VariableProxy(bool is_this); |
| 775 | |
| 776 | friend class Scope; |
| 777 | }; |
| 778 | |
| 779 | |
| 780 | class VariableProxySentinel: public VariableProxy { |
| 781 | public: |
| 782 | virtual bool IsValidLeftHandSide() { return !is_this(); } |
| 783 | static VariableProxySentinel* this_proxy() { return &this_proxy_; } |
| 784 | static VariableProxySentinel* identifier_proxy() { |
| 785 | return &identifier_proxy_; |
| 786 | } |
| 787 | |
| 788 | private: |
| 789 | explicit VariableProxySentinel(bool is_this) : VariableProxy(is_this) { } |
| 790 | static VariableProxySentinel this_proxy_; |
| 791 | static VariableProxySentinel identifier_proxy_; |
| 792 | }; |
| 793 | |
| 794 | |
| 795 | class Slot: public Expression { |
| 796 | public: |
| 797 | enum Type { |
| 798 | // A slot in the parameter section on the stack. index() is |
| 799 | // the parameter index, counting left-to-right, starting at 0. |
| 800 | PARAMETER, |
| 801 | |
| 802 | // A slot in the local section on the stack. index() is |
| 803 | // the variable index in the stack frame, starting at 0. |
| 804 | LOCAL, |
| 805 | |
| 806 | // An indexed slot in a heap context. index() is the |
| 807 | // variable index in the context object on the heap, |
| 808 | // starting at 0. var()->scope() is the corresponding |
| 809 | // scope. |
| 810 | CONTEXT, |
| 811 | |
| 812 | // A named slot in a heap context. var()->name() is the |
| 813 | // variable name in the context object on the heap, |
| 814 | // with lookup starting at the current context. index() |
| 815 | // is invalid. |
| 816 | LOOKUP, |
| 817 | |
| 818 | // A property in the global object. var()->name() is |
| 819 | // the property name. |
| 820 | GLOBAL |
| 821 | }; |
| 822 | |
| 823 | Slot(Variable* var, Type type, int index) |
| 824 | : var_(var), type_(type), index_(index) { |
| 825 | ASSERT(var != NULL); |
| 826 | } |
| 827 | |
| 828 | virtual void Accept(Visitor* v); |
| 829 | |
| 830 | // Type testing & conversion |
| 831 | virtual Slot* AsSlot() { return this; } |
| 832 | |
| 833 | // Accessors |
| 834 | Variable* var() const { return var_; } |
| 835 | Type type() const { return type_; } |
| 836 | int index() const { return index_; } |
| 837 | |
| 838 | private: |
| 839 | Variable* var_; |
| 840 | Type type_; |
| 841 | int index_; |
| 842 | }; |
| 843 | |
| 844 | |
| 845 | class Property: public Expression { |
| 846 | public: |
| 847 | Property(Expression* obj, Expression* key, int pos) |
| 848 | : obj_(obj), key_(key), pos_(pos) { } |
| 849 | |
| 850 | virtual void Accept(Visitor* v); |
| 851 | |
| 852 | // Type testing & conversion |
| 853 | virtual Property* AsProperty() { return this; } |
| 854 | |
| 855 | virtual bool IsValidLeftHandSide() { return true; } |
| 856 | |
| 857 | Expression* obj() const { return obj_; } |
| 858 | Expression* key() const { return key_; } |
| 859 | int position() const { return pos_; } |
| 860 | |
| 861 | // Returns a property singleton property access on 'this'. Used |
| 862 | // during preparsing. |
| 863 | static Property* this_property() { return &this_property_; } |
| 864 | |
| 865 | private: |
| 866 | Expression* obj_; |
| 867 | Expression* key_; |
| 868 | int pos_; |
| 869 | |
| 870 | // Dummy property used during preparsing |
| 871 | static Property this_property_; |
| 872 | }; |
| 873 | |
| 874 | |
| 875 | class Call: public Expression { |
| 876 | public: |
| 877 | Call(Expression* expression, |
| 878 | ZoneList<Expression*>* arguments, |
| 879 | bool is_eval, |
| 880 | int pos) |
| 881 | : expression_(expression), |
| 882 | arguments_(arguments), |
| 883 | is_eval_(is_eval), |
| 884 | pos_(pos) { } |
| 885 | |
| 886 | virtual void Accept(Visitor* v); |
| 887 | |
| 888 | // Type testing and conversion. |
| 889 | virtual Call* AsCall() { return this; } |
| 890 | |
| 891 | Expression* expression() const { return expression_; } |
| 892 | ZoneList<Expression*>* arguments() const { return arguments_; } |
| 893 | bool is_eval() { return is_eval_; } |
| 894 | int position() { return pos_; } |
| 895 | |
| 896 | static Call* sentinel() { return &sentinel_; } |
| 897 | |
| 898 | private: |
| 899 | Expression* expression_; |
| 900 | ZoneList<Expression*>* arguments_; |
| 901 | bool is_eval_; |
| 902 | int pos_; |
| 903 | |
| 904 | static Call sentinel_; |
| 905 | }; |
| 906 | |
| 907 | |
| 908 | class CallNew: public Call { |
| 909 | public: |
| 910 | CallNew(Expression* expression, ZoneList<Expression*>* arguments, int pos) |
| 911 | : Call(expression, arguments, false, pos) { } |
| 912 | |
| 913 | virtual void Accept(Visitor* v); |
| 914 | }; |
| 915 | |
| 916 | |
| 917 | // The CallRuntime class does not represent any official JavaScript |
| 918 | // language construct. Instead it is used to call a C or JS function |
| 919 | // with a set of arguments. This is used from the builtins that are |
| 920 | // implemented in JavaScript (see "v8natives.js"). |
| 921 | class CallRuntime: public Expression { |
| 922 | public: |
| 923 | CallRuntime(Handle<String> name, |
| 924 | Runtime::Function* function, |
| 925 | ZoneList<Expression*>* arguments) |
| 926 | : name_(name), function_(function), arguments_(arguments) { } |
| 927 | |
| 928 | virtual void Accept(Visitor* v); |
| 929 | |
| 930 | Handle<String> name() const { return name_; } |
| 931 | Runtime::Function* function() const { return function_; } |
| 932 | ZoneList<Expression*>* arguments() const { return arguments_; } |
| 933 | |
| 934 | private: |
| 935 | Handle<String> name_; |
| 936 | Runtime::Function* function_; |
| 937 | ZoneList<Expression*>* arguments_; |
| 938 | }; |
| 939 | |
| 940 | |
| 941 | class UnaryOperation: public Expression { |
| 942 | public: |
| 943 | UnaryOperation(Token::Value op, Expression* expression) |
| 944 | : op_(op), expression_(expression) { |
| 945 | ASSERT(Token::IsUnaryOp(op)); |
| 946 | } |
| 947 | |
| 948 | virtual void Accept(Visitor* v); |
| 949 | |
| 950 | // Type testing & conversion |
| 951 | virtual UnaryOperation* AsUnaryOperation() { return this; } |
| 952 | |
| 953 | Token::Value op() const { return op_; } |
| 954 | Expression* expression() const { return expression_; } |
| 955 | |
| 956 | private: |
| 957 | Token::Value op_; |
| 958 | Expression* expression_; |
| 959 | }; |
| 960 | |
| 961 | |
| 962 | class BinaryOperation: public Expression { |
| 963 | public: |
| 964 | BinaryOperation(Token::Value op, Expression* left, Expression* right) |
| 965 | : op_(op), left_(left), right_(right) { |
| 966 | ASSERT(Token::IsBinaryOp(op)); |
| 967 | } |
| 968 | |
| 969 | virtual void Accept(Visitor* v); |
| 970 | |
| 971 | // Type testing & conversion |
| 972 | virtual BinaryOperation* AsBinaryOperation() { return this; } |
| 973 | |
| 974 | // True iff the result can be safely overwritten (to avoid allocation). |
| 975 | // False for operations that can return one of their operands. |
| 976 | bool ResultOverwriteAllowed() { |
| 977 | switch (op_) { |
| 978 | case Token::COMMA: |
| 979 | case Token::OR: |
| 980 | case Token::AND: |
| 981 | return false; |
| 982 | case Token::BIT_OR: |
| 983 | case Token::BIT_XOR: |
| 984 | case Token::BIT_AND: |
| 985 | case Token::SHL: |
| 986 | case Token::SAR: |
| 987 | case Token::SHR: |
| 988 | case Token::ADD: |
| 989 | case Token::SUB: |
| 990 | case Token::MUL: |
| 991 | case Token::DIV: |
| 992 | case Token::MOD: |
| 993 | return true; |
| 994 | default: |
| 995 | UNREACHABLE(); |
| 996 | } |
| 997 | return false; |
| 998 | } |
| 999 | |
| 1000 | Token::Value op() const { return op_; } |
| 1001 | Expression* left() const { return left_; } |
| 1002 | Expression* right() const { return right_; } |
| 1003 | |
| 1004 | private: |
| 1005 | Token::Value op_; |
| 1006 | Expression* left_; |
| 1007 | Expression* right_; |
| 1008 | }; |
| 1009 | |
| 1010 | |
| 1011 | class CountOperation: public Expression { |
| 1012 | public: |
| 1013 | CountOperation(bool is_prefix, Token::Value op, Expression* expression) |
| 1014 | : is_prefix_(is_prefix), op_(op), expression_(expression) { |
| 1015 | ASSERT(Token::IsCountOp(op)); |
| 1016 | } |
| 1017 | |
| 1018 | virtual void Accept(Visitor* v); |
| 1019 | |
| 1020 | bool is_prefix() const { return is_prefix_; } |
| 1021 | bool is_postfix() const { return !is_prefix_; } |
| 1022 | Token::Value op() const { return op_; } |
| 1023 | Expression* expression() const { return expression_; } |
| 1024 | |
| 1025 | virtual void MarkAsStatement() { is_prefix_ = true; } |
| 1026 | |
| 1027 | private: |
| 1028 | bool is_prefix_; |
| 1029 | Token::Value op_; |
| 1030 | Expression* expression_; |
| 1031 | }; |
| 1032 | |
| 1033 | |
| 1034 | class CompareOperation: public Expression { |
| 1035 | public: |
| 1036 | CompareOperation(Token::Value op, Expression* left, Expression* right) |
| 1037 | : op_(op), left_(left), right_(right) { |
| 1038 | ASSERT(Token::IsCompareOp(op)); |
| 1039 | } |
| 1040 | |
| 1041 | virtual void Accept(Visitor* v); |
| 1042 | |
| 1043 | Token::Value op() const { return op_; } |
| 1044 | Expression* left() const { return left_; } |
| 1045 | Expression* right() const { return right_; } |
| 1046 | |
| 1047 | private: |
| 1048 | Token::Value op_; |
| 1049 | Expression* left_; |
| 1050 | Expression* right_; |
| 1051 | }; |
| 1052 | |
| 1053 | |
| 1054 | class Conditional: public Expression { |
| 1055 | public: |
| 1056 | Conditional(Expression* condition, |
| 1057 | Expression* then_expression, |
| 1058 | Expression* else_expression) |
| 1059 | : condition_(condition), |
| 1060 | then_expression_(then_expression), |
| 1061 | else_expression_(else_expression) { } |
| 1062 | |
| 1063 | virtual void Accept(Visitor* v); |
| 1064 | |
| 1065 | Expression* condition() const { return condition_; } |
| 1066 | Expression* then_expression() const { return then_expression_; } |
| 1067 | Expression* else_expression() const { return else_expression_; } |
| 1068 | |
| 1069 | private: |
| 1070 | Expression* condition_; |
| 1071 | Expression* then_expression_; |
| 1072 | Expression* else_expression_; |
| 1073 | }; |
| 1074 | |
| 1075 | |
| 1076 | class Assignment: public Expression { |
| 1077 | public: |
| 1078 | Assignment(Token::Value op, Expression* target, Expression* value, int pos) |
| 1079 | : op_(op), target_(target), value_(value), pos_(pos) { |
| 1080 | ASSERT(Token::IsAssignmentOp(op)); |
| 1081 | } |
| 1082 | |
| 1083 | virtual void Accept(Visitor* v); |
| 1084 | virtual Assignment* AsAssignment() { return this; } |
| 1085 | |
| 1086 | Token::Value binary_op() const; |
| 1087 | |
| 1088 | Token::Value op() const { return op_; } |
| 1089 | Expression* target() const { return target_; } |
| 1090 | Expression* value() const { return value_; } |
| 1091 | int position() { return pos_; } |
| 1092 | |
| 1093 | private: |
| 1094 | Token::Value op_; |
| 1095 | Expression* target_; |
| 1096 | Expression* value_; |
| 1097 | int pos_; |
| 1098 | }; |
| 1099 | |
| 1100 | |
| 1101 | class Throw: public Expression { |
| 1102 | public: |
| 1103 | Throw(Expression* exception, int pos) |
| 1104 | : exception_(exception), pos_(pos) {} |
| 1105 | |
| 1106 | virtual void Accept(Visitor* v); |
| 1107 | Expression* exception() const { return exception_; } |
| 1108 | int position() const { return pos_; } |
| 1109 | |
| 1110 | private: |
| 1111 | Expression* exception_; |
| 1112 | int pos_; |
| 1113 | }; |
| 1114 | |
| 1115 | |
| 1116 | class FunctionLiteral: public Expression { |
| 1117 | public: |
| 1118 | FunctionLiteral(Handle<String> name, |
| 1119 | Scope* scope, |
| 1120 | ZoneList<Statement*>* body, |
| 1121 | int materialized_literal_count, |
| 1122 | int expected_property_count, |
| 1123 | int num_parameters, |
| 1124 | int start_position, |
| 1125 | int end_position, |
| 1126 | bool is_expression) |
| 1127 | : name_(name), |
| 1128 | scope_(scope), |
| 1129 | body_(body), |
| 1130 | materialized_literal_count_(materialized_literal_count), |
| 1131 | expected_property_count_(expected_property_count), |
| 1132 | num_parameters_(num_parameters), |
| 1133 | start_position_(start_position), |
| 1134 | end_position_(end_position), |
| 1135 | is_expression_(is_expression), |
| 1136 | function_token_position_(kNoPosition) { |
| 1137 | } |
| 1138 | |
| 1139 | virtual void Accept(Visitor* v); |
| 1140 | |
| 1141 | // Type testing & conversion |
| 1142 | virtual FunctionLiteral* AsFunctionLiteral() { return this; } |
| 1143 | |
| 1144 | Handle<String> name() const { return name_; } |
| 1145 | Scope* scope() const { return scope_; } |
| 1146 | ZoneList<Statement*>* body() const { return body_; } |
| 1147 | void set_function_token_position(int pos) { function_token_position_ = pos; } |
| 1148 | int function_token_position() const { return function_token_position_; } |
| 1149 | int start_position() const { return start_position_; } |
| 1150 | int end_position() const { return end_position_; } |
| 1151 | bool is_expression() const { return is_expression_; } |
| 1152 | |
| 1153 | int materialized_literal_count() { return materialized_literal_count_; } |
| 1154 | int expected_property_count() { return expected_property_count_; } |
| 1155 | int num_parameters() { return num_parameters_; } |
| 1156 | |
| 1157 | bool AllowsLazyCompilation(); |
| 1158 | |
| 1159 | private: |
| 1160 | Handle<String> name_; |
| 1161 | Scope* scope_; |
| 1162 | ZoneList<Statement*>* body_; |
| 1163 | int materialized_literal_count_; |
| 1164 | int expected_property_count_; |
| 1165 | int num_parameters_; |
| 1166 | int start_position_; |
| 1167 | int end_position_; |
| 1168 | bool is_expression_; |
| 1169 | int function_token_position_; |
| 1170 | }; |
| 1171 | |
| 1172 | |
| 1173 | class FunctionBoilerplateLiteral: public Expression { |
| 1174 | public: |
| 1175 | explicit FunctionBoilerplateLiteral(Handle<JSFunction> boilerplate) |
| 1176 | : boilerplate_(boilerplate) { |
| 1177 | ASSERT(boilerplate->IsBoilerplate()); |
| 1178 | } |
| 1179 | |
| 1180 | Handle<JSFunction> boilerplate() const { return boilerplate_; } |
| 1181 | |
| 1182 | virtual void Accept(Visitor* v); |
| 1183 | |
| 1184 | private: |
| 1185 | Handle<JSFunction> boilerplate_; |
| 1186 | }; |
| 1187 | |
| 1188 | |
| 1189 | class ThisFunction: public Expression { |
| 1190 | public: |
| 1191 | virtual void Accept(Visitor* v); |
| 1192 | }; |
| 1193 | |
| 1194 | |
| 1195 | // ---------------------------------------------------------------------------- |
| 1196 | // Basic visitor |
| 1197 | // - leaf node visitors are abstract. |
| 1198 | |
| 1199 | class Visitor BASE_EMBEDDED { |
| 1200 | public: |
| 1201 | Visitor() : stack_overflow_(false) { } |
| 1202 | virtual ~Visitor() { } |
| 1203 | |
| 1204 | // Dispatch |
| 1205 | void Visit(Node* node) { node->Accept(this); } |
| 1206 | |
| 1207 | // Iteration |
| 1208 | virtual void VisitStatements(ZoneList<Statement*>* statements); |
| 1209 | virtual void VisitExpressions(ZoneList<Expression*>* expressions); |
| 1210 | |
| 1211 | // Stack overflow tracking support. |
| 1212 | bool HasStackOverflow() const { return stack_overflow_; } |
| 1213 | bool CheckStackOverflow() { |
| 1214 | if (stack_overflow_) return true; |
| 1215 | StackLimitCheck check; |
| 1216 | if (!check.HasOverflowed()) return false; |
| 1217 | return (stack_overflow_ = true); |
| 1218 | } |
| 1219 | |
kasper.lund | 212ac23 | 2008-07-16 07:07:30 +0000 | [diff] [blame] | 1220 | // If a stack-overflow exception is encountered when visiting a |
| 1221 | // node, calling SetStackOverflow will make sure that the visitor |
| 1222 | // bails out without visiting more nodes. |
| 1223 | void SetStackOverflow() { stack_overflow_ = true; } |
| 1224 | |
| 1225 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1226 | // Individual nodes |
| 1227 | #define DEF_VISIT(type) \ |
| 1228 | virtual void Visit##type(type* node) = 0; |
| 1229 | NODE_LIST(DEF_VISIT) |
| 1230 | #undef DEF_VISIT |
| 1231 | |
| 1232 | private: |
| 1233 | bool stack_overflow_; |
| 1234 | }; |
| 1235 | |
| 1236 | |
| 1237 | } } // namespace v8::internal |
| 1238 | |
| 1239 | #endif // V8_AST_H_ |