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| 1 // Copyright 2012 the V8 project authors. All rights reserved. | 1 // Copyright 2012 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/v8.h" | 5 #include "src/v8.h" |
| 6 | 6 |
| 7 #include "src/accessors.h" | 7 #include "src/accessors.h" |
| 8 #include "src/bootstrapper.h" | 8 #include "src/bootstrapper.h" |
| 9 #include "src/messages.h" | 9 #include "src/messages.h" |
| 10 #include "src/parser.h" | 10 #include "src/parser.h" |
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| 685 | 685 |
| 686 bool Scope::HasTrivialContext() const { | 686 bool Scope::HasTrivialContext() const { |
| 687 // A function scope has a trivial context if it always is the global | 687 // A function scope has a trivial context if it always is the global |
| 688 // context. We iteratively scan out the context chain to see if | 688 // context. We iteratively scan out the context chain to see if |
| 689 // there is anything that makes this scope non-trivial; otherwise we | 689 // there is anything that makes this scope non-trivial; otherwise we |
| 690 // return true. | 690 // return true. |
| 691 for (const Scope* scope = this; scope != NULL; scope = scope->outer_scope_) { | 691 for (const Scope* scope = this; scope != NULL; scope = scope->outer_scope_) { |
| 692 if (scope->is_eval_scope()) return false; | 692 if (scope->is_eval_scope()) return false; |
| 693 if (scope->scope_inside_with_) return false; | 693 if (scope->scope_inside_with_) return false; |
| 694 if (scope->ContextLocalCount() > 0) return false; | 694 if (scope->ContextLocalCount() > 0) return false; |
| 695 if (scope->ContextGlobalCount() > 0) return false; |
| 695 } | 696 } |
| 696 return true; | 697 return true; |
| 697 } | 698 } |
| 698 | 699 |
| 699 | 700 |
| 700 bool Scope::HasTrivialOuterContext() const { | 701 bool Scope::HasTrivialOuterContext() const { |
| 701 Scope* outer = outer_scope_; | 702 Scope* outer = outer_scope_; |
| 702 if (outer == NULL) return true; | 703 if (outer == NULL) return true; |
| 703 // Note that the outer context may be trivial in general, but the current | 704 // Note that the outer context may be trivial in general, but the current |
| 704 // scope may be inside a 'with' statement in which case the outer context | 705 // scope may be inside a 'with' statement in which case the outer context |
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| 1599 function_ != NULL && function_->proxy()->var()->IsContextSlot(); | 1600 function_ != NULL && function_->proxy()->var()->IsContextSlot(); |
| 1600 return num_heap_slots() - Context::MIN_CONTEXT_SLOTS - num_global_slots() - | 1601 return num_heap_slots() - Context::MIN_CONTEXT_SLOTS - num_global_slots() - |
| 1601 (is_function_var_in_context ? 1 : 0); | 1602 (is_function_var_in_context ? 1 : 0); |
| 1602 } | 1603 } |
| 1603 | 1604 |
| 1604 | 1605 |
| 1605 int Scope::ContextGlobalCount() const { return num_global_slots(); } | 1606 int Scope::ContextGlobalCount() const { return num_global_slots(); } |
| 1606 | 1607 |
| 1607 } // namespace internal | 1608 } // namespace internal |
| 1608 } // namespace v8 | 1609 } // namespace v8 |
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