variables.cc 1.63 KB
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// Copyright 2011 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
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#include "src/ast/variables.h"
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#include "src/ast/scopes.h"
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#include "src/globals.h"
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namespace v8 {
namespace internal {
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// ----------------------------------------------------------------------------
// Implementation Variable.

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Variable::Variable(Scope* scope, const AstRawString* name, VariableMode mode,
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                   VariableKind kind, InitializationFlag initialization_flag,
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                   MaybeAssignedFlag maybe_assigned_flag)
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    : scope_(scope),
      name_(name),
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      local_if_not_shadowed_(nullptr),
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      index_(-1),
      initializer_position_(kNoSourcePosition),
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      bit_field_(MaybeAssignedFlagField::encode(maybe_assigned_flag) |
                 InitializationFlagField::encode(initialization_flag) |
                 VariableModeField::encode(mode) | IsUsedField::encode(false) |
                 ForceContextAllocationField::encode(false) |
                 LocationField::encode(VariableLocation::UNALLOCATED) |
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                 VariableKindField::encode(kind)) {
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  // Var declared variables never need initialization.
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  DCHECK(!(mode == VAR && initialization_flag == kNeedsInitialization));
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}


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bool Variable::IsGlobalObjectProperty() const {
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  // Temporaries are never global, they must always be allocated in the
  // activation frame.
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  return (IsDynamicVariableMode(mode()) ||
          (IsDeclaredVariableMode(mode()) && !IsLexicalVariableMode(mode()))) &&
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         scope_ != NULL && scope_->is_script_scope();
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}

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}  // namespace internal
}  // namespace v8