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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/ast/scopes.h" | 5 #include "src/ast/scopes.h" |
| 6 | 6 |
| 7 #include "src/accessors.h" | 7 #include "src/accessors.h" |
| 8 #include "src/ast/scopeinfo.h" | 8 #include "src/ast/scopeinfo.h" |
| 9 #include "src/bootstrapper.h" | 9 #include "src/bootstrapper.h" |
| 10 #include "src/messages.h" | 10 #include "src/messages.h" |
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| 195 outer_scope_calls_sloppy_eval_ = false; | 195 outer_scope_calls_sloppy_eval_ = false; |
| 196 inner_scope_calls_eval_ = false; | 196 inner_scope_calls_eval_ = false; |
| 197 scope_nonlinear_ = false; | 197 scope_nonlinear_ = false; |
| 198 force_eager_compilation_ = false; | 198 force_eager_compilation_ = false; |
| 199 force_context_allocation_ = (outer_scope != NULL && !is_function_scope()) | 199 force_context_allocation_ = (outer_scope != NULL && !is_function_scope()) |
| 200 ? outer_scope->has_forced_context_allocation() : false; | 200 ? outer_scope->has_forced_context_allocation() : false; |
| 201 num_var_or_const_ = 0; | 201 num_var_or_const_ = 0; |
| 202 num_stack_slots_ = 0; | 202 num_stack_slots_ = 0; |
| 203 num_heap_slots_ = 0; | 203 num_heap_slots_ = 0; |
| 204 num_global_slots_ = 0; | 204 num_global_slots_ = 0; |
| 205 num_modules_ = 0; | |
| 206 module_var_ = NULL; | |
| 207 arity_ = 0; | 205 arity_ = 0; |
| 208 has_simple_parameters_ = true; | 206 has_simple_parameters_ = true; |
| 209 rest_parameter_ = NULL; | 207 rest_parameter_ = NULL; |
| 210 rest_index_ = -1; | 208 rest_index_ = -1; |
| 211 scope_info_ = scope_info; | 209 scope_info_ = scope_info; |
| 212 start_position_ = RelocInfo::kNoPosition; | 210 start_position_ = RelocInfo::kNoPosition; |
| 213 end_position_ = RelocInfo::kNoPosition; | 211 end_position_ = RelocInfo::kNoPosition; |
| 214 if (!scope_info.is_null()) { | 212 if (!scope_info.is_null()) { |
| 215 scope_calls_eval_ = scope_info->CallsEval(); | 213 scope_calls_eval_ = scope_info->CallsEval(); |
| 216 language_mode_ = scope_info->language_mode(); | 214 language_mode_ = scope_info->language_mode(); |
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| 711 bool Scope::AllocateVariables(ParseInfo* info, AstNodeFactory* factory) { | 709 bool Scope::AllocateVariables(ParseInfo* info, AstNodeFactory* factory) { |
| 712 // 1) Propagate scope information. | 710 // 1) Propagate scope information. |
| 713 bool outer_scope_calls_sloppy_eval = false; | 711 bool outer_scope_calls_sloppy_eval = false; |
| 714 if (outer_scope_ != NULL) { | 712 if (outer_scope_ != NULL) { |
| 715 outer_scope_calls_sloppy_eval = | 713 outer_scope_calls_sloppy_eval = |
| 716 outer_scope_->outer_scope_calls_sloppy_eval() | | 714 outer_scope_->outer_scope_calls_sloppy_eval() | |
| 717 outer_scope_->calls_sloppy_eval(); | 715 outer_scope_->calls_sloppy_eval(); |
| 718 } | 716 } |
| 719 PropagateScopeInfo(outer_scope_calls_sloppy_eval); | 717 PropagateScopeInfo(outer_scope_calls_sloppy_eval); |
| 720 | 718 |
| 721 // 2) Allocate module instances. | 719 // 2) Resolve variables. |
| 722 if (FLAG_harmony_modules && is_script_scope()) { | |
| 723 DCHECK(num_modules_ == 0); | |
| 724 AllocateModules(); | |
| 725 } | |
| 726 | |
| 727 // 3) Resolve variables. | |
| 728 if (!ResolveVariablesRecursively(info, factory)) return false; | 720 if (!ResolveVariablesRecursively(info, factory)) return false; |
| 729 | 721 |
| 730 // 4) Allocate variables. | 722 // 3) Allocate variables. |
| 731 AllocateVariablesRecursively(info->isolate()); | 723 AllocateVariablesRecursively(info->isolate()); |
| 732 | 724 |
| 733 return true; | 725 return true; |
| 734 } | 726 } |
| 735 | 727 |
| 736 | 728 |
| 737 bool Scope::HasTrivialContext() const { | 729 bool Scope::HasTrivialContext() const { |
| 738 // A function scope has a trivial context if it always is the global | 730 // A function scope has a trivial context if it always is the global |
| 739 // context. We iteratively scan out the context chain to see if | 731 // context. We iteratively scan out the context chain to see if |
| 740 // there is anything that makes this scope non-trivial; otherwise we | 732 // there is anything that makes this scope non-trivial; otherwise we |
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| 1629 // need the minimal number of slots if we must have a context. | 1621 // need the minimal number of slots if we must have a context. |
| 1630 if (num_heap_slots_ == Context::MIN_CONTEXT_SLOTS && !must_have_context) { | 1622 if (num_heap_slots_ == Context::MIN_CONTEXT_SLOTS && !must_have_context) { |
| 1631 num_heap_slots_ = 0; | 1623 num_heap_slots_ = 0; |
| 1632 } | 1624 } |
| 1633 | 1625 |
| 1634 // Allocation done. | 1626 // Allocation done. |
| 1635 DCHECK(num_heap_slots_ == 0 || num_heap_slots_ >= Context::MIN_CONTEXT_SLOTS); | 1627 DCHECK(num_heap_slots_ == 0 || num_heap_slots_ >= Context::MIN_CONTEXT_SLOTS); |
| 1636 } | 1628 } |
| 1637 | 1629 |
| 1638 | 1630 |
| 1639 void Scope::AllocateModules() { | |
| 1640 DCHECK(is_script_scope()); | |
| 1641 DCHECK(!already_resolved()); | |
| 1642 for (int i = 0; i < inner_scopes_.length(); i++) { | |
| 1643 Scope* scope = inner_scopes_.at(i); | |
| 1644 if (scope->is_module_scope()) { | |
| 1645 DCHECK(!scope->already_resolved()); | |
| 1646 DCHECK(scope->module_descriptor_->IsFrozen()); | |
| 1647 DCHECK_NULL(scope->module_var_); | |
| 1648 scope->module_var_ = | |
| 1649 NewTemporary(ast_value_factory_->dot_module_string()); | |
| 1650 ++num_modules_; | |
| 1651 } | |
| 1652 } | |
| 1653 } | |
| 1654 | |
| 1655 | |
| 1656 int Scope::StackLocalCount() const { | 1631 int Scope::StackLocalCount() const { |
| 1657 return num_stack_slots() - | 1632 return num_stack_slots() - |
| 1658 (function_ != NULL && function_->proxy()->var()->IsStackLocal() ? 1 : 0); | 1633 (function_ != NULL && function_->proxy()->var()->IsStackLocal() ? 1 : 0); |
| 1659 } | 1634 } |
| 1660 | 1635 |
| 1661 | 1636 |
| 1662 int Scope::ContextLocalCount() const { | 1637 int Scope::ContextLocalCount() const { |
| 1663 if (num_heap_slots() == 0) return 0; | 1638 if (num_heap_slots() == 0) return 0; |
| 1664 bool is_function_var_in_context = | 1639 bool is_function_var_in_context = |
| 1665 function_ != NULL && function_->proxy()->var()->IsContextSlot(); | 1640 function_ != NULL && function_->proxy()->var()->IsContextSlot(); |
| 1666 return num_heap_slots() - Context::MIN_CONTEXT_SLOTS - num_global_slots() - | 1641 return num_heap_slots() - Context::MIN_CONTEXT_SLOTS - num_global_slots() - |
| 1667 (is_function_var_in_context ? 1 : 0); | 1642 (is_function_var_in_context ? 1 : 0); |
| 1668 } | 1643 } |
| 1669 | 1644 |
| 1670 | 1645 |
| 1671 int Scope::ContextGlobalCount() const { return num_global_slots(); } | 1646 int Scope::ContextGlobalCount() const { return num_global_slots(); } |
| 1672 | 1647 |
| 1673 } // namespace internal | 1648 } // namespace internal |
| 1674 } // namespace v8 | 1649 } // namespace v8 |
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