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/v8.h"
6
7 #include "src/ast.h"
8 #include "src/scopes.h"
9 #include "src/variables.h"
10
11 namespace v8 {
12 namespace internal {
13
14 // ----------------------------------------------------------------------------
15 // Implementation Variable.
16
Mode2String(VariableMode mode)17 const char* Variable::Mode2String(VariableMode mode) {
18 switch (mode) {
19 case VAR: return "VAR";
20 case CONST_LEGACY: return "CONST_LEGACY";
21 case LET: return "LET";
22 case CONST: return "CONST";
23 case MODULE: return "MODULE";
24 case DYNAMIC: return "DYNAMIC";
25 case DYNAMIC_GLOBAL: return "DYNAMIC_GLOBAL";
26 case DYNAMIC_LOCAL: return "DYNAMIC_LOCAL";
27 case INTERNAL: return "INTERNAL";
28 case TEMPORARY: return "TEMPORARY";
29 }
30 UNREACHABLE();
31 return NULL;
32 }
33
34
Variable(Scope * scope,const AstRawString * name,VariableMode mode,bool is_valid_ref,Kind kind,InitializationFlag initialization_flag,MaybeAssignedFlag maybe_assigned_flag,Interface * interface)35 Variable::Variable(Scope* scope, const AstRawString* name, VariableMode mode,
36 bool is_valid_ref, Kind kind,
37 InitializationFlag initialization_flag,
38 MaybeAssignedFlag maybe_assigned_flag, Interface* interface)
39 : scope_(scope),
40 name_(name),
41 mode_(mode),
42 kind_(kind),
43 location_(UNALLOCATED),
44 index_(-1),
45 initializer_position_(RelocInfo::kNoPosition),
46 local_if_not_shadowed_(NULL),
47 is_valid_ref_(is_valid_ref),
48 force_context_allocation_(false),
49 is_used_(false),
50 initialization_flag_(initialization_flag),
51 maybe_assigned_(maybe_assigned_flag),
52 interface_(interface) {
53 // Var declared variables never need initialization.
54 DCHECK(!(mode == VAR && initialization_flag == kNeedsInitialization));
55 }
56
57
IsGlobalObjectProperty() const58 bool Variable::IsGlobalObjectProperty() const {
59 // Temporaries are never global, they must always be allocated in the
60 // activation frame.
61 return (IsDynamicVariableMode(mode_) ||
62 (IsDeclaredVariableMode(mode_) && !IsLexicalVariableMode(mode_)))
63 && scope_ != NULL && scope_->is_global_scope();
64 }
65
66
CompareIndex(Variable * const * v,Variable * const * w)67 int Variable::CompareIndex(Variable* const* v, Variable* const* w) {
68 int x = (*v)->index();
69 int y = (*w)->index();
70 // Consider sorting them according to type as well?
71 return x - y;
72 }
73
74 } } // namespace v8::internal
75