deps/v8/src/variables.cc

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