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1 // Copyright 2015 the V8 project authors. All rights reserved. | 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 | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #include "src/interpreter/bytecode-generator.h" | 5 #include "src/interpreter/bytecode-generator.h" |
6 | 6 |
7 #include "src/ast/scopes.h" | 7 #include "src/ast/scopes.h" |
8 #include "src/compiler.h" | 8 #include "src/compiler.h" |
9 #include "src/interpreter/bytecode-register-allocator.h" | 9 #include "src/interpreter/bytecode-register-allocator.h" |
10 #include "src/interpreter/control-flow-builders.h" | 10 #include "src/interpreter/control-flow-builders.h" |
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415 | 415 |
416 // Visit declarations within the function scope. | 416 // Visit declarations within the function scope. |
417 VisitDeclarations(scope()->declarations()); | 417 VisitDeclarations(scope()->declarations()); |
418 | 418 |
419 // Visit statements in the function body. | 419 // Visit statements in the function body. |
420 VisitStatements(info()->literal()->body()); | 420 VisitStatements(info()->literal()->body()); |
421 } | 421 } |
422 | 422 |
423 | 423 |
424 void BytecodeGenerator::VisitBlock(Block* stmt) { | 424 void BytecodeGenerator::VisitBlock(Block* stmt) { |
425 BlockBuilder block_builder(this->builder()); | 425 // Visit declarations and statements. |
| 426 if (stmt->scope() != nullptr && stmt->scope()->NeedsContext()) { |
| 427 VisitNewLocalBlockContext(stmt->scope()); |
| 428 ContextScope scope(this, stmt->scope()); |
| 429 VisitBlockDeclarationsAndStatements(stmt); |
| 430 } else { |
| 431 VisitBlockDeclarationsAndStatements(stmt); |
| 432 } |
| 433 } |
| 434 |
| 435 |
| 436 void BytecodeGenerator::VisitBlockDeclarationsAndStatements(Block* stmt) { |
| 437 BlockBuilder block_builder(builder()); |
426 ControlScopeForBreakable execution_control(this, stmt, &block_builder); | 438 ControlScopeForBreakable execution_control(this, stmt, &block_builder); |
427 | 439 if (stmt->scope() != nullptr) { |
428 if (stmt->scope() == NULL) { | 440 VisitDeclarations(stmt->scope()->declarations()); |
429 // Visit statements in the same scope, no declarations. | |
430 VisitStatements(stmt->statements()); | |
431 } else { | |
432 // Visit declarations and statements in a block scope. | |
433 if (stmt->scope()->NeedsContext()) { | |
434 VisitNewLocalBlockContext(stmt->scope()); | |
435 ContextScope scope(this, stmt->scope()); | |
436 VisitDeclarations(stmt->scope()->declarations()); | |
437 VisitStatements(stmt->statements()); | |
438 } else { | |
439 VisitDeclarations(stmt->scope()->declarations()); | |
440 VisitStatements(stmt->statements()); | |
441 } | |
442 } | 441 } |
| 442 VisitStatements(stmt->statements()); |
443 if (stmt->labels() != nullptr) block_builder.EndBlock(); | 443 if (stmt->labels() != nullptr) block_builder.EndBlock(); |
444 } | 444 } |
445 | 445 |
446 | 446 |
447 void BytecodeGenerator::VisitVariableDeclaration(VariableDeclaration* decl) { | 447 void BytecodeGenerator::VisitVariableDeclaration(VariableDeclaration* decl) { |
448 Variable* variable = decl->proxy()->var(); | 448 Variable* variable = decl->proxy()->var(); |
449 VariableMode mode = decl->mode(); | 449 VariableMode mode = decl->mode(); |
450 // Const and let variables are initialized with the hole so that we can | 450 // Const and let variables are initialized with the hole so that we can |
451 // check that they are only assigned once. | 451 // check that they are only assigned once. |
452 bool hole_init = mode == CONST || mode == CONST_LEGACY || mode == LET; | 452 bool hole_init = mode == CONST || mode == CONST_LEGACY || mode == LET; |
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2216 } | 2216 } |
2217 | 2217 |
2218 | 2218 |
2219 int BytecodeGenerator::feedback_index(FeedbackVectorSlot slot) const { | 2219 int BytecodeGenerator::feedback_index(FeedbackVectorSlot slot) const { |
2220 return info()->feedback_vector()->GetIndex(slot); | 2220 return info()->feedback_vector()->GetIndex(slot); |
2221 } | 2221 } |
2222 | 2222 |
2223 } // namespace interpreter | 2223 } // namespace interpreter |
2224 } // namespace internal | 2224 } // namespace internal |
2225 } // namespace v8 | 2225 } // namespace v8 |
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