Create ast/ and parsing/ subdirectories and move appropriate files

src/variables.h

-// 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.
-
-#ifndef V8_VARIABLES_H_
-#define V8_VARIABLES_H_
-
-#include "src/ast-value-factory.h"
-#include "src/zone.h"
-
-namespace v8 {
-namespace internal {
-
-// The AST refers to variables via VariableProxies - placeholders for the actual
-// variables. Variables themselves are never directly referred to from the AST,
-// they are maintained by scopes, and referred to from VariableProxies and Slots
-// after binding and variable allocation.
-
-class ClassVariable;
-
-class Variable: public ZoneObject {
- public:
-  enum Kind { NORMAL, FUNCTION, CLASS, THIS, ARGUMENTS };
-
-  Variable(Scope* scope, const AstRawString* name, VariableMode mode, Kind kind,
-           InitializationFlag initialization_flag,
-           MaybeAssignedFlag maybe_assigned_flag = kNotAssigned);
-
-  virtual ~Variable() {}
-
-  // Printing support
-  static const char* Mode2String(VariableMode mode);
-
-  // The source code for an eval() call may refer to a variable that is
-  // in an outer scope about which we don't know anything (it may not
-  // be the script scope). scope() is NULL in that case. Currently the
-  // scope is only used to follow the context chain length.
-  Scope* scope() const { return scope_; }
-
-  Handle<String> name() const { return name_->string(); }
-  const AstRawString* raw_name() const { return name_; }
-  VariableMode mode() const { return mode_; }
-  bool has_forced_context_allocation() const {
-    return force_context_allocation_;
-  }
-  void ForceContextAllocation() {
-    force_context_allocation_ = true;
-  }
-  bool is_used() { return is_used_; }
-  void set_is_used() { is_used_ = true; }
-  MaybeAssignedFlag maybe_assigned() const { return maybe_assigned_; }
-  void set_maybe_assigned() { maybe_assigned_ = kMaybeAssigned; }
-
-  int initializer_position() { return initializer_position_; }
-  void set_initializer_position(int pos) { initializer_position_ = pos; }
-
-  bool IsVariable(Handle<String> n) const {
-    return !is_this() && name().is_identical_to(n);
-  }
-
-  bool IsUnallocated() const {
-    return location_ == VariableLocation::UNALLOCATED;
-  }
-  bool IsParameter() const { return location_ == VariableLocation::PARAMETER; }
-  bool IsStackLocal() const { return location_ == VariableLocation::LOCAL; }
-  bool IsStackAllocated() const { return IsParameter() || IsStackLocal(); }
-  bool IsContextSlot() const { return location_ == VariableLocation::CONTEXT; }
-  bool IsGlobalSlot() const { return location_ == VariableLocation::GLOBAL; }
-  bool IsUnallocatedOrGlobalSlot() const {
-    return IsUnallocated() || IsGlobalSlot();
-  }
-  bool IsLookupSlot() const { return location_ == VariableLocation::LOOKUP; }
-  bool IsGlobalObjectProperty() const;
-  bool IsStaticGlobalObjectProperty() const;
-
-  bool is_dynamic() const { return IsDynamicVariableMode(mode_); }
-  bool is_const_mode() const { return IsImmutableVariableMode(mode_); }
-  bool binding_needs_init() const {
-    return initialization_flag_ == kNeedsInitialization;
-  }
-
-  bool is_function() const { return kind_ == FUNCTION; }
-  bool is_class() const { return kind_ == CLASS; }
-  bool is_this() const { return kind_ == THIS; }
-  bool is_arguments() const { return kind_ == ARGUMENTS; }
-
-  // For script scopes, the "this" binding is provided by a ScriptContext added
-  // to the global's ScriptContextTable.  This binding might not statically
-  // resolve to a Variable::THIS binding, instead being DYNAMIC_LOCAL.  However
-  // any variable named "this" does indeed refer to a Variable::THIS binding;
-  // the grammar ensures this to be the case.  So wherever a "this" binding
-  // might be provided by the global, use HasThisName instead of is_this().
-  bool HasThisName(Isolate* isolate) const {
-    return is_this() || *name() == *isolate->factory()->this_string();
-  }
-
-  ClassVariable* AsClassVariable() {
-    DCHECK(is_class());
-    return reinterpret_cast<ClassVariable*>(this);
-  }
-
-  // True if the variable is named eval and not known to be shadowed.
-  bool is_possibly_eval(Isolate* isolate) const {
-    return IsVariable(isolate->factory()->eval_string());
-  }
-
-  Variable* local_if_not_shadowed() const {
-    DCHECK(mode_ == DYNAMIC_LOCAL && local_if_not_shadowed_ != NULL);
-    return local_if_not_shadowed_;
-  }
-
-  void set_local_if_not_shadowed(Variable* local) {
-    local_if_not_shadowed_ = local;
-  }
-
-  VariableLocation location() const { return location_; }
-  int index() const { return index_; }
-  InitializationFlag initialization_flag() const {
-    return initialization_flag_;
-  }
-
-  void AllocateTo(VariableLocation location, int index) {
-    location_ = location;
-    index_ = index;
-  }
-
-  void SetFromEval() { is_from_eval_ = true; }
-
-  static int CompareIndex(Variable* const* v, Variable* const* w);
-
-  void RecordStrongModeReference(int start_position, int end_position) {
-    // Record the earliest reference to the variable. Used in error messages for
-    // strong mode references to undeclared variables.
-    if (has_strong_mode_reference_ &&
-        strong_mode_reference_start_position_ < start_position)
-      return;
-    has_strong_mode_reference_ = true;
-    strong_mode_reference_start_position_ = start_position;
-    strong_mode_reference_end_position_ = end_position;
-  }
-
-  bool has_strong_mode_reference() const { return has_strong_mode_reference_; }
-  int strong_mode_reference_start_position() const {
-    return strong_mode_reference_start_position_;
-  }
-  int strong_mode_reference_end_position() const {
-    return strong_mode_reference_end_position_;
-  }
-  PropertyAttributes DeclarationPropertyAttributes() const {
-    int property_attributes = NONE;
-    if (IsImmutableVariableMode(mode_)) {
-      property_attributes |= READ_ONLY;
-    }
-    if (is_from_eval_) {
-      property_attributes |= EVAL_DECLARED;
-    }
-    return static_cast<PropertyAttributes>(property_attributes);
-  }
-
- private:
-  Scope* scope_;
-  const AstRawString* name_;
-  VariableMode mode_;
-  Kind kind_;
-  VariableLocation location_;
-  int index_;
-  int initializer_position_;
-  // Tracks whether the variable is bound to a VariableProxy which is in strong
-  // mode, and if yes, the source location of the reference.
-  bool has_strong_mode_reference_;
-  int strong_mode_reference_start_position_;
-  int strong_mode_reference_end_position_;
-
-  // If this field is set, this variable references the stored locally bound
-  // variable, but it might be shadowed by variable bindings introduced by
-  // sloppy 'eval' calls between the reference scope (inclusive) and the
-  // binding scope (exclusive).
-  Variable* local_if_not_shadowed_;
-
-  // True if this variable is introduced by a sloppy eval
-  bool is_from_eval_;
-
-  // Usage info.
-  bool force_context_allocation_;  // set by variable resolver
-  bool is_used_;
-  InitializationFlag initialization_flag_;
-  MaybeAssignedFlag maybe_assigned_;
-};
-
-class ClassVariable : public Variable {
- public:
-  ClassVariable(Scope* scope, const AstRawString* name, VariableMode mode,
-                InitializationFlag initialization_flag,
-                MaybeAssignedFlag maybe_assigned_flag = kNotAssigned,
-                int declaration_group_start = -1)
-      : Variable(scope, name, mode, Variable::CLASS, initialization_flag,
-                 maybe_assigned_flag),
-        declaration_group_start_(declaration_group_start) {}
-
-  int declaration_group_start() const { return declaration_group_start_; }
-  void set_declaration_group_start(int declaration_group_start) {
-    declaration_group_start_ = declaration_group_start;
-  }
-
- private:
-  // For classes we keep track of consecutive groups of delcarations. They are
-  // needed for strong mode scoping checks. TODO(marja, rossberg): Implement
-  // checks for functions too.
-  int declaration_group_start_;
-};
-}  // namespace internal
-}  // namespace v8
-
-#endif  // V8_VARIABLES_H_