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
Mode2String(VariableMode mode)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 DYNAMIC: return "DYNAMIC";
23 case DYNAMIC_GLOBAL: return "DYNAMIC_GLOBAL";
24 case DYNAMIC_LOCAL: return "DYNAMIC_LOCAL";
25 case TEMPORARY: return "TEMPORARY";
26 }
27 UNREACHABLE();
28 return NULL;
29 }
30
31
Variable(Scope * scope,const AstRawString * name,VariableMode mode,Kind kind,InitializationFlag initialization_flag,MaybeAssignedFlag maybe_assigned_flag)32 Variable::Variable(Scope* scope, const AstRawString* name, VariableMode mode,
33 Kind kind, InitializationFlag initialization_flag,
34 MaybeAssignedFlag maybe_assigned_flag)
35 : scope_(scope),
36 name_(name),
37 mode_(mode),
38 kind_(kind),
39 location_(VariableLocation::UNALLOCATED),
40 index_(-1),
41 initializer_position_(RelocInfo::kNoPosition),
42 local_if_not_shadowed_(NULL),
43 force_context_allocation_(false),
44 is_used_(false),
45 initialization_flag_(initialization_flag),
46 maybe_assigned_(maybe_assigned_flag) {
47 // Var declared variables never need initialization.
48 DCHECK(!(mode == VAR && initialization_flag == kNeedsInitialization));
49 }
50
51
IsGlobalObjectProperty() const52 bool Variable::IsGlobalObjectProperty() const {
53 // Temporaries are never global, they must always be allocated in the
54 // activation frame.
55 return (IsDynamicVariableMode(mode_) ||
56 (IsDeclaredVariableMode(mode_) && !IsLexicalVariableMode(mode_))) &&
57 scope_ != NULL && scope_->is_script_scope() && !is_this();
58 }
59
60
IsStaticGlobalObjectProperty() const61 bool Variable::IsStaticGlobalObjectProperty() const {
62 // Temporaries are never global, they must always be allocated in the
63 // activation frame.
64 return (IsDeclaredVariableMode(mode_) && !IsLexicalVariableMode(mode_)) &&
65 scope_ != NULL && scope_->is_script_scope() && !is_this();
66 }
67
68
CompareIndex(Variable * const * v,Variable * const * w)69 int Variable::CompareIndex(Variable* const* v, Variable* const* w) {
70 int x = (*v)->index();
71 int y = (*w)->index();
72 // Consider sorting them according to type as well?
73 return x - y;
74 }
75
76 } // namespace internal
77 } // namespace v8
78