variables.cc

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// Copyright 2011 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
 
#include "src/ast/variables.h"
 
#include "src/ast/scopes.h"
#include "src/common/globals.h"
 
namespace v8 {
namespace internal {
 
// ----------------------------------------------------------------------------
// Implementation Variable.
 
Variable::Variable(Variable* other)
    : scope_(other->scope_),
      name_(other->name_),
      local_if_not_shadowed_(nullptr),
      next_(nullptr),
      index_(other->index_),
      initializer_position_(other->initializer_position_),
      bit_field_(other->bit_field_) {}
 
bool Variable::IsGlobalObjectProperty() const {
  // Temporaries are never global, they must always be allocated in the
  // activation frame.
  return (IsDynamicVariableMode(mode()) || mode() == VariableMode::kVar) &&
         scope_ != nullptr && scope_->is_script_scope();
}
 
bool Variable::IsReplGlobal() const {
  return scope()->is_repl_mode_scope() &&
         (mode() == VariableMode::kLet || mode() == VariableMode::kConst ||
          mode() == VariableMode::kUsing ||
          mode() == VariableMode::kAwaitUsing);
}
 
void Variable::RewriteLocationForRepl() {
  DCHECK(scope_->is_repl_mode_scope());
 
  if (mode() == VariableMode::kLet || mode() == VariableMode::kConst ||
      mode() == VariableMode::kUsing || mode() == VariableMode::kAwaitUsing) {
    DCHECK_EQ(location(), VariableLocation::CONTEXT);
    bit_field_ =
        LocationField::update(bit_field_, VariableLocation::REPL_GLOBAL);
  }
}
 
void Variable::AssignHoleCheckBitmapIndex(ZoneVector<Variable*>& list,
                                          uint8_t next_index) {
  DCHECK_EQ(next_index, list.size() + 1);
  DCHECK_NE(kUncacheableHoleCheckBitmapIndex, next_index);
  DCHECK_LT(next_index, kHoleCheckBitmapBits);
  hole_check_analysis_bit_field_ = HoleCheckBitmapIndexField::update(
      hole_check_analysis_bit_field_, next_index);
  list.push_back(this);
}
 
}  // namespace internal
}  // namespace v8