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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/ast.h"
#include "src/ast/scopes.h"
namespace v8 {
namespace internal {
// ----------------------------------------------------------------------------
// Implementation Variable.
const char* Variable::Mode2String(VariableMode mode) {
switch (mode) {
case VAR: return "VAR";
case CONST_LEGACY: return "CONST_LEGACY";
case LET: return "LET";
case CONST: return "CONST";
case IMPORT: return "IMPORT";
case DYNAMIC: return "DYNAMIC";
case DYNAMIC_GLOBAL: return "DYNAMIC_GLOBAL";
case DYNAMIC_LOCAL: return "DYNAMIC_LOCAL";
case TEMPORARY: return "TEMPORARY";
}
UNREACHABLE();
return NULL;
}
Variable::Variable(Scope* scope, const AstRawString* name, VariableMode mode,
Kind kind, InitializationFlag initialization_flag,
MaybeAssignedFlag maybe_assigned_flag)
: scope_(scope),
name_(name),
mode_(mode),
kind_(kind),
location_(VariableLocation::UNALLOCATED),
index_(-1),
initializer_position_(RelocInfo::kNoPosition),
local_if_not_shadowed_(NULL),
is_from_eval_(false),
force_context_allocation_(false),
is_used_(false),
initialization_flag_(initialization_flag),
maybe_assigned_(maybe_assigned_flag) {
// Var declared variables never need initialization.
DCHECK(!(mode == VAR && initialization_flag == kNeedsInitialization));
}
bool Variable::IsGlobalObjectProperty() const {
// Temporaries are never global, they must always be allocated in the
// activation frame.
return (IsDynamicVariableMode(mode_) ||
(IsDeclaredVariableMode(mode_) && !IsLexicalVariableMode(mode_))) &&
scope_ != NULL && scope_->is_script_scope() && !is_this();
}
bool Variable::IsStaticGlobalObjectProperty() const {
// Temporaries are never global, they must always be allocated in the
// activation frame.
return (IsDeclaredVariableMode(mode_) && !IsLexicalVariableMode(mode_)) &&
scope_ != NULL && scope_->is_script_scope() && !is_this();
}
int Variable::CompareIndex(Variable* const* v, Variable* const* w) {
int x = (*v)->index();
int y = (*w)->index();
// Consider sorting them according to type as well?
return x - y;
}
} // namespace internal
} // namespace v8
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