Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 1 | // Copyright 2015 the V8 project authors. All rights reserved. |
| 2 | // Use of this source code is governed by a BSD-style license that can be |
| 3 | // found in the LICENSE file. |
| 4 | |
| 5 | #include "src/ast/ast.h" |
| 6 | #include "src/ast/ast-expression-rewriter.h" |
| 7 | |
| 8 | namespace v8 { |
| 9 | namespace internal { |
| 10 | |
| 11 | // ---------------------------------------------------------------------------- |
| 12 | // Implementation of AstExpressionRewriter |
| 13 | // The AST is traversed but no actual rewriting takes place, unless the |
| 14 | // Visit methods are overriden in subclasses. |
| 15 | |
| 16 | #define REWRITE_THIS(node) \ |
| 17 | do { \ |
| 18 | if (!RewriteExpression(node)) return; \ |
| 19 | } while (false) |
| 20 | #define NOTHING() DCHECK_NULL(replacement_) |
| 21 | |
| 22 | |
| 23 | void AstExpressionRewriter::VisitDeclarations( |
| 24 | ZoneList<Declaration*>* declarations) { |
| 25 | for (int i = 0; i < declarations->length(); i++) { |
| 26 | AST_REWRITE_LIST_ELEMENT(Declaration, declarations, i); |
| 27 | } |
| 28 | } |
| 29 | |
| 30 | |
| 31 | void AstExpressionRewriter::VisitStatements(ZoneList<Statement*>* statements) { |
| 32 | for (int i = 0; i < statements->length(); i++) { |
| 33 | AST_REWRITE_LIST_ELEMENT(Statement, statements, i); |
| 34 | // Not stopping when a jump statement is found. |
| 35 | } |
| 36 | } |
| 37 | |
| 38 | |
| 39 | void AstExpressionRewriter::VisitExpressions( |
| 40 | ZoneList<Expression*>* expressions) { |
| 41 | for (int i = 0; i < expressions->length(); i++) { |
| 42 | // The variable statement visiting code may pass NULL expressions |
| 43 | // to this code. Maybe this should be handled by introducing an |
| 44 | // undefined expression or literal? Revisit this code if this |
| 45 | // changes |
| 46 | if (expressions->at(i) != nullptr) { |
| 47 | AST_REWRITE_LIST_ELEMENT(Expression, expressions, i); |
| 48 | } |
| 49 | } |
| 50 | } |
| 51 | |
| 52 | |
| 53 | void AstExpressionRewriter::VisitVariableDeclaration( |
| 54 | VariableDeclaration* node) { |
| 55 | // Not visiting `proxy_`. |
| 56 | NOTHING(); |
| 57 | } |
| 58 | |
| 59 | |
| 60 | void AstExpressionRewriter::VisitFunctionDeclaration( |
| 61 | FunctionDeclaration* node) { |
| 62 | // Not visiting `proxy_`. |
| 63 | AST_REWRITE_PROPERTY(FunctionLiteral, node, fun); |
| 64 | } |
| 65 | |
| 66 | |
| 67 | void AstExpressionRewriter::VisitImportDeclaration(ImportDeclaration* node) { |
| 68 | // Not visiting `proxy_`. |
| 69 | NOTHING(); |
| 70 | } |
| 71 | |
| 72 | |
| 73 | void AstExpressionRewriter::VisitExportDeclaration(ExportDeclaration* node) { |
| 74 | // Not visiting `proxy_`. |
| 75 | NOTHING(); |
| 76 | } |
| 77 | |
| 78 | |
| 79 | void AstExpressionRewriter::VisitBlock(Block* node) { |
| 80 | VisitStatements(node->statements()); |
| 81 | } |
| 82 | |
| 83 | |
| 84 | void AstExpressionRewriter::VisitExpressionStatement( |
| 85 | ExpressionStatement* node) { |
| 86 | AST_REWRITE_PROPERTY(Expression, node, expression); |
| 87 | } |
| 88 | |
| 89 | |
| 90 | void AstExpressionRewriter::VisitEmptyStatement(EmptyStatement* node) { |
| 91 | NOTHING(); |
| 92 | } |
| 93 | |
| 94 | |
| 95 | void AstExpressionRewriter::VisitSloppyBlockFunctionStatement( |
| 96 | SloppyBlockFunctionStatement* node) { |
| 97 | AST_REWRITE_PROPERTY(Statement, node, statement); |
| 98 | } |
| 99 | |
| 100 | |
| 101 | void AstExpressionRewriter::VisitIfStatement(IfStatement* node) { |
| 102 | AST_REWRITE_PROPERTY(Expression, node, condition); |
| 103 | AST_REWRITE_PROPERTY(Statement, node, then_statement); |
| 104 | AST_REWRITE_PROPERTY(Statement, node, else_statement); |
| 105 | } |
| 106 | |
| 107 | |
| 108 | void AstExpressionRewriter::VisitContinueStatement(ContinueStatement* node) { |
| 109 | NOTHING(); |
| 110 | } |
| 111 | |
| 112 | |
| 113 | void AstExpressionRewriter::VisitBreakStatement(BreakStatement* node) { |
| 114 | NOTHING(); |
| 115 | } |
| 116 | |
| 117 | |
| 118 | void AstExpressionRewriter::VisitReturnStatement(ReturnStatement* node) { |
| 119 | AST_REWRITE_PROPERTY(Expression, node, expression); |
| 120 | } |
| 121 | |
| 122 | |
| 123 | void AstExpressionRewriter::VisitWithStatement(WithStatement* node) { |
| 124 | AST_REWRITE_PROPERTY(Expression, node, expression); |
| 125 | AST_REWRITE_PROPERTY(Statement, node, statement); |
| 126 | } |
| 127 | |
| 128 | |
| 129 | void AstExpressionRewriter::VisitSwitchStatement(SwitchStatement* node) { |
| 130 | AST_REWRITE_PROPERTY(Expression, node, tag); |
| 131 | ZoneList<CaseClause*>* clauses = node->cases(); |
| 132 | for (int i = 0; i < clauses->length(); i++) { |
| 133 | AST_REWRITE_LIST_ELEMENT(CaseClause, clauses, i); |
| 134 | } |
| 135 | } |
| 136 | |
| 137 | |
| 138 | void AstExpressionRewriter::VisitDoWhileStatement(DoWhileStatement* node) { |
| 139 | AST_REWRITE_PROPERTY(Expression, node, cond); |
| 140 | AST_REWRITE_PROPERTY(Statement, node, body); |
| 141 | } |
| 142 | |
| 143 | |
| 144 | void AstExpressionRewriter::VisitWhileStatement(WhileStatement* node) { |
| 145 | AST_REWRITE_PROPERTY(Expression, node, cond); |
| 146 | AST_REWRITE_PROPERTY(Statement, node, body); |
| 147 | } |
| 148 | |
| 149 | |
| 150 | void AstExpressionRewriter::VisitForStatement(ForStatement* node) { |
| 151 | if (node->init() != nullptr) { |
| 152 | AST_REWRITE_PROPERTY(Statement, node, init); |
| 153 | } |
| 154 | if (node->cond() != nullptr) { |
| 155 | AST_REWRITE_PROPERTY(Expression, node, cond); |
| 156 | } |
| 157 | if (node->next() != nullptr) { |
| 158 | AST_REWRITE_PROPERTY(Statement, node, next); |
| 159 | } |
| 160 | AST_REWRITE_PROPERTY(Statement, node, body); |
| 161 | } |
| 162 | |
| 163 | |
| 164 | void AstExpressionRewriter::VisitForInStatement(ForInStatement* node) { |
| 165 | AST_REWRITE_PROPERTY(Expression, node, each); |
| 166 | AST_REWRITE_PROPERTY(Expression, node, subject); |
| 167 | AST_REWRITE_PROPERTY(Statement, node, body); |
| 168 | } |
| 169 | |
| 170 | |
| 171 | void AstExpressionRewriter::VisitForOfStatement(ForOfStatement* node) { |
| 172 | AST_REWRITE_PROPERTY(Expression, node, each); |
| 173 | AST_REWRITE_PROPERTY(Expression, node, assign_iterator); |
| 174 | AST_REWRITE_PROPERTY(Expression, node, next_result); |
| 175 | AST_REWRITE_PROPERTY(Expression, node, result_done); |
| 176 | AST_REWRITE_PROPERTY(Expression, node, assign_each); |
| 177 | AST_REWRITE_PROPERTY(Expression, node, subject); |
| 178 | AST_REWRITE_PROPERTY(Statement, node, body); |
| 179 | } |
| 180 | |
| 181 | |
| 182 | void AstExpressionRewriter::VisitTryCatchStatement(TryCatchStatement* node) { |
| 183 | AST_REWRITE_PROPERTY(Block, node, try_block); |
| 184 | // Not visiting the variable. |
| 185 | AST_REWRITE_PROPERTY(Block, node, catch_block); |
| 186 | } |
| 187 | |
| 188 | |
| 189 | void AstExpressionRewriter::VisitTryFinallyStatement( |
| 190 | TryFinallyStatement* node) { |
| 191 | AST_REWRITE_PROPERTY(Block, node, try_block); |
| 192 | AST_REWRITE_PROPERTY(Block, node, finally_block); |
| 193 | } |
| 194 | |
| 195 | |
| 196 | void AstExpressionRewriter::VisitDebuggerStatement(DebuggerStatement* node) { |
| 197 | NOTHING(); |
| 198 | } |
| 199 | |
| 200 | |
| 201 | void AstExpressionRewriter::VisitFunctionLiteral(FunctionLiteral* node) { |
| 202 | REWRITE_THIS(node); |
| 203 | VisitDeclarations(node->scope()->declarations()); |
| 204 | ZoneList<Statement*>* body = node->body(); |
| 205 | if (body != nullptr) VisitStatements(body); |
| 206 | } |
| 207 | |
| 208 | |
| 209 | void AstExpressionRewriter::VisitClassLiteral(ClassLiteral* node) { |
| 210 | REWRITE_THIS(node); |
| 211 | // Not visiting `class_variable_proxy_`. |
| 212 | if (node->extends() != nullptr) { |
| 213 | AST_REWRITE_PROPERTY(Expression, node, extends); |
| 214 | } |
| 215 | AST_REWRITE_PROPERTY(FunctionLiteral, node, constructor); |
| 216 | ZoneList<typename ClassLiteral::Property*>* properties = node->properties(); |
| 217 | for (int i = 0; i < properties->length(); i++) { |
| 218 | VisitObjectLiteralProperty(properties->at(i)); |
| 219 | } |
| 220 | } |
| 221 | |
| 222 | |
| 223 | void AstExpressionRewriter::VisitNativeFunctionLiteral( |
| 224 | NativeFunctionLiteral* node) { |
| 225 | REWRITE_THIS(node); |
| 226 | NOTHING(); |
| 227 | } |
| 228 | |
| 229 | |
| 230 | void AstExpressionRewriter::VisitConditional(Conditional* node) { |
| 231 | REWRITE_THIS(node); |
| 232 | AST_REWRITE_PROPERTY(Expression, node, condition); |
| 233 | AST_REWRITE_PROPERTY(Expression, node, then_expression); |
| 234 | AST_REWRITE_PROPERTY(Expression, node, else_expression); |
| 235 | } |
| 236 | |
| 237 | |
| 238 | void AstExpressionRewriter::VisitVariableProxy(VariableProxy* node) { |
| 239 | REWRITE_THIS(node); |
| 240 | NOTHING(); |
| 241 | } |
| 242 | |
| 243 | |
| 244 | void AstExpressionRewriter::VisitLiteral(Literal* node) { |
| 245 | REWRITE_THIS(node); |
| 246 | NOTHING(); |
| 247 | } |
| 248 | |
| 249 | |
| 250 | void AstExpressionRewriter::VisitRegExpLiteral(RegExpLiteral* node) { |
| 251 | REWRITE_THIS(node); |
| 252 | NOTHING(); |
| 253 | } |
| 254 | |
| 255 | |
| 256 | void AstExpressionRewriter::VisitObjectLiteral(ObjectLiteral* node) { |
| 257 | REWRITE_THIS(node); |
| 258 | ZoneList<typename ObjectLiteral::Property*>* properties = node->properties(); |
| 259 | for (int i = 0; i < properties->length(); i++) { |
| 260 | VisitObjectLiteralProperty(properties->at(i)); |
| 261 | } |
| 262 | } |
| 263 | |
| 264 | |
| 265 | void AstExpressionRewriter::VisitObjectLiteralProperty( |
| 266 | ObjectLiteralProperty* property) { |
| 267 | if (property == nullptr) return; |
| 268 | AST_REWRITE_PROPERTY(Expression, property, key); |
| 269 | AST_REWRITE_PROPERTY(Expression, property, value); |
| 270 | } |
| 271 | |
| 272 | |
| 273 | void AstExpressionRewriter::VisitArrayLiteral(ArrayLiteral* node) { |
| 274 | REWRITE_THIS(node); |
| 275 | VisitExpressions(node->values()); |
| 276 | } |
| 277 | |
| 278 | |
| 279 | void AstExpressionRewriter::VisitAssignment(Assignment* node) { |
| 280 | REWRITE_THIS(node); |
| 281 | AST_REWRITE_PROPERTY(Expression, node, target); |
| 282 | AST_REWRITE_PROPERTY(Expression, node, value); |
| 283 | } |
| 284 | |
| 285 | |
| 286 | void AstExpressionRewriter::VisitYield(Yield* node) { |
| 287 | REWRITE_THIS(node); |
| 288 | AST_REWRITE_PROPERTY(Expression, node, generator_object); |
| 289 | AST_REWRITE_PROPERTY(Expression, node, expression); |
| 290 | } |
| 291 | |
| 292 | |
| 293 | void AstExpressionRewriter::VisitThrow(Throw* node) { |
| 294 | REWRITE_THIS(node); |
| 295 | AST_REWRITE_PROPERTY(Expression, node, exception); |
| 296 | } |
| 297 | |
| 298 | |
| 299 | void AstExpressionRewriter::VisitProperty(Property* node) { |
| 300 | REWRITE_THIS(node); |
| 301 | if (node == nullptr) return; |
| 302 | AST_REWRITE_PROPERTY(Expression, node, obj); |
| 303 | AST_REWRITE_PROPERTY(Expression, node, key); |
| 304 | } |
| 305 | |
| 306 | |
| 307 | void AstExpressionRewriter::VisitCall(Call* node) { |
| 308 | REWRITE_THIS(node); |
| 309 | AST_REWRITE_PROPERTY(Expression, node, expression); |
| 310 | VisitExpressions(node->arguments()); |
| 311 | } |
| 312 | |
| 313 | |
| 314 | void AstExpressionRewriter::VisitCallNew(CallNew* node) { |
| 315 | REWRITE_THIS(node); |
| 316 | AST_REWRITE_PROPERTY(Expression, node, expression); |
| 317 | VisitExpressions(node->arguments()); |
| 318 | } |
| 319 | |
| 320 | |
| 321 | void AstExpressionRewriter::VisitCallRuntime(CallRuntime* node) { |
| 322 | REWRITE_THIS(node); |
| 323 | VisitExpressions(node->arguments()); |
| 324 | } |
| 325 | |
| 326 | |
| 327 | void AstExpressionRewriter::VisitUnaryOperation(UnaryOperation* node) { |
| 328 | REWRITE_THIS(node); |
| 329 | AST_REWRITE_PROPERTY(Expression, node, expression); |
| 330 | } |
| 331 | |
| 332 | |
| 333 | void AstExpressionRewriter::VisitCountOperation(CountOperation* node) { |
| 334 | REWRITE_THIS(node); |
| 335 | AST_REWRITE_PROPERTY(Expression, node, expression); |
| 336 | } |
| 337 | |
| 338 | |
| 339 | void AstExpressionRewriter::VisitBinaryOperation(BinaryOperation* node) { |
| 340 | REWRITE_THIS(node); |
| 341 | AST_REWRITE_PROPERTY(Expression, node, left); |
| 342 | AST_REWRITE_PROPERTY(Expression, node, right); |
| 343 | } |
| 344 | |
| 345 | |
| 346 | void AstExpressionRewriter::VisitCompareOperation(CompareOperation* node) { |
| 347 | REWRITE_THIS(node); |
| 348 | AST_REWRITE_PROPERTY(Expression, node, left); |
| 349 | AST_REWRITE_PROPERTY(Expression, node, right); |
| 350 | } |
| 351 | |
| 352 | |
| 353 | void AstExpressionRewriter::VisitSpread(Spread* node) { |
| 354 | REWRITE_THIS(node); |
| 355 | AST_REWRITE_PROPERTY(Expression, node, expression); |
| 356 | } |
| 357 | |
| 358 | |
| 359 | void AstExpressionRewriter::VisitThisFunction(ThisFunction* node) { |
| 360 | REWRITE_THIS(node); |
| 361 | NOTHING(); |
| 362 | } |
| 363 | |
| 364 | |
| 365 | void AstExpressionRewriter::VisitSuperPropertyReference( |
| 366 | SuperPropertyReference* node) { |
| 367 | REWRITE_THIS(node); |
| 368 | AST_REWRITE_PROPERTY(VariableProxy, node, this_var); |
| 369 | AST_REWRITE_PROPERTY(Expression, node, home_object); |
| 370 | } |
| 371 | |
| 372 | |
| 373 | void AstExpressionRewriter::VisitSuperCallReference(SuperCallReference* node) { |
| 374 | REWRITE_THIS(node); |
| 375 | AST_REWRITE_PROPERTY(VariableProxy, node, this_var); |
| 376 | AST_REWRITE_PROPERTY(VariableProxy, node, new_target_var); |
| 377 | AST_REWRITE_PROPERTY(VariableProxy, node, this_function_var); |
| 378 | } |
| 379 | |
| 380 | |
| 381 | void AstExpressionRewriter::VisitCaseClause(CaseClause* node) { |
| 382 | if (!node->is_default()) { |
| 383 | AST_REWRITE_PROPERTY(Expression, node, label); |
| 384 | } |
| 385 | VisitStatements(node->statements()); |
| 386 | } |
| 387 | |
| 388 | |
| 389 | void AstExpressionRewriter::VisitEmptyParentheses(EmptyParentheses* node) { |
| 390 | NOTHING(); |
| 391 | } |
| 392 | |
| 393 | |
| 394 | void AstExpressionRewriter::VisitDoExpression(DoExpression* node) { |
| 395 | REWRITE_THIS(node); |
| 396 | AST_REWRITE_PROPERTY(Block, node, block); |
| 397 | AST_REWRITE_PROPERTY(VariableProxy, node, result); |
| 398 | } |
| 399 | |
| 400 | |
| 401 | void AstExpressionRewriter::VisitRewritableAssignmentExpression( |
| 402 | RewritableAssignmentExpression* node) { |
| 403 | REWRITE_THIS(node); |
| 404 | AST_REWRITE_PROPERTY(Expression, node, expression); |
| 405 | } |
| 406 | |
| 407 | |
| 408 | } // namespace internal |
| 409 | } // namespace v8 |