1 // Copyright 2011 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/variables.h" 6 7 #include "src/ast/ast.h" 8 #include "src/ast/scopes.h" 9 10 namespace v8 { 11 namespace internal { 12 13 // ---------------------------------------------------------------------------- 14 // Implementation Variable. 15 16 const char* Variable::Mode2String(VariableMode mode) { 17 switch (mode) { 18 case VAR: return "VAR"; 19 case CONST_LEGACY: return "CONST_LEGACY"; 20 case LET: return "LET"; 21 case CONST: return "CONST"; 22 case IMPORT: return "IMPORT"; 23 case DYNAMIC: return "DYNAMIC"; 24 case DYNAMIC_GLOBAL: return "DYNAMIC_GLOBAL"; 25 case DYNAMIC_LOCAL: return "DYNAMIC_LOCAL"; 26 case TEMPORARY: return "TEMPORARY"; 27 } 28 UNREACHABLE(); 29 return NULL; 30 } 31 32 33 Variable::Variable(Scope* scope, const AstRawString* name, VariableMode mode, 34 Kind kind, InitializationFlag initialization_flag, 35 MaybeAssignedFlag maybe_assigned_flag) 36 : scope_(scope), 37 name_(name), 38 mode_(mode), 39 kind_(kind), 40 location_(VariableLocation::UNALLOCATED), 41 index_(-1), 42 initializer_position_(RelocInfo::kNoPosition), 43 has_strong_mode_reference_(false), 44 strong_mode_reference_start_position_(RelocInfo::kNoPosition), 45 strong_mode_reference_end_position_(RelocInfo::kNoPosition), 46 local_if_not_shadowed_(NULL), 47 is_from_eval_(false), 48 force_context_allocation_(false), 49 is_used_(false), 50 initialization_flag_(initialization_flag), 51 maybe_assigned_(maybe_assigned_flag) { 52 // Var declared variables never need initialization. 53 DCHECK(!(mode == VAR && initialization_flag == kNeedsInitialization)); 54 } 55 56 57 bool Variable::IsGlobalObjectProperty() const { 58 // Temporaries are never global, they must always be allocated in the 59 // activation frame. 60 return (IsDynamicVariableMode(mode_) || 61 (IsDeclaredVariableMode(mode_) && !IsLexicalVariableMode(mode_))) && 62 scope_ != NULL && scope_->is_script_scope() && !is_this(); 63 } 64 65 66 bool Variable::IsStaticGlobalObjectProperty() const { 67 // Temporaries are never global, they must always be allocated in the 68 // activation frame. 69 return (IsDeclaredVariableMode(mode_) && !IsLexicalVariableMode(mode_)) && 70 scope_ != NULL && scope_->is_script_scope() && !is_this(); 71 } 72 73 74 int Variable::CompareIndex(Variable* const* v, Variable* const* w) { 75 int x = (*v)->index(); 76 int y = (*w)->index(); 77 // Consider sorting them according to type as well? 78 return x - y; 79 } 80 81 } // namespace internal 82 } // namespace v8 83
