text: // Copyright 2015 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_CONTEXTS_INL_H_
  #define V8_CONTEXTS_INL_H_
  
  #include "src/contexts.h"
  #include "src/objects-inl.h"
  
  namespace v8 {
  namespace internal {
  
  
  // static
  ScriptContextTable* ScriptContextTable::cast(Object* context) {
    DCHECK(context->IsScriptContextTable());
    return reinterpret_cast<ScriptContextTable*>(context);
  }
  
  
  int ScriptContextTable::used() const {
    return Smi::cast(get(kUsedSlot))->value();
  }
  
  
  void ScriptContextTable::set_used(int used) {
    set(kUsedSlot, Smi::FromInt(used));
  }
  
  
  // static
  Handle<Context> ScriptContextTable::GetContext(Handle<ScriptContextTable> table,
                                                 int i) {
    DCHECK(i < table->used());
    return Handle<Context>::cast(
        FixedArray::get(*table, i + kFirstContextSlot, table->GetIsolate()));
  }
  
  
  // static
  Context* Context::cast(Object* context) {
    DCHECK(context->IsContext());
    return reinterpret_cast<Context*>(context);
  }
  
  
  JSFunction* Context::closure() { return JSFunction::cast(get(CLOSURE_INDEX)); }
  void Context::set_closure(JSFunction* closure) { set(CLOSURE_INDEX, closure); }
  
  
  Context* Context::previous() {
    Object* result = get(PREVIOUS_INDEX);
    DCHECK(IsBootstrappingOrValidParentContext(result, this));
    return reinterpret_cast<Context*>(result);
  }
  void Context::set_previous(Context* context) { set(PREVIOUS_INDEX, context); }
  
  Object* Context::next_context_link() { return get(Context::NEXT_CONTEXT_LINK); }
  
  bool Context::has_extension() { return !extension()->IsTheHole(GetIsolate()); }
  HeapObject* Context::extension() {
    return HeapObject::cast(get(EXTENSION_INDEX));
  }
  void Context::set_extension(HeapObject* object) {
    set(EXTENSION_INDEX, object);
  }
  
  
  Context* Context::native_context() {
    Object* result = get(NATIVE_CONTEXT_INDEX);
    DCHECK(IsBootstrappingOrNativeContext(this->GetIsolate(), result));
    return reinterpret_cast<Context*>(result);
  }
  
  
  void Context::set_native_context(Context* context) {
    set(NATIVE_CONTEXT_INDEX, context);
  }
  
  
  bool Context::IsNativeContext() {
    Map* map = this->map();
    return map == map->GetHeap()->native_context_map();
  }
  
  
  bool Context::IsFunctionContext() {
    Map* map = this->map();
    return map == map->GetHeap()->function_context_map();
  }
  
  
  bool Context::IsCatchContext() {
    Map* map = this->map();
    return map == map->GetHeap()->catch_context_map();
  }
  
  
  bool Context::IsWithContext() {
    Map* map = this->map();
    return map == map->GetHeap()->with_context_map();
  }
  
  bool Context::IsDebugEvaluateContext() {
    Map* map = this->map();
    return map == map->GetHeap()->debug_evaluate_context_map();
  }
  
  bool Context::IsBlockContext() {
    Map* map = this->map();
    return map == map->GetHeap()->block_context_map();
  }
  
  
  bool Context::IsModuleContext() {
    Map* map = this->map();
    return map == map->GetHeap()->module_context_map();
  }
  
  
  bool Context::IsScriptContext() {
    Map* map = this->map();
    return map == map->GetHeap()->script_context_map();
  }
  
  bool Context::OptimizedCodeMapIsCleared() {
    return osr_code_table() == GetHeap()->empty_fixed_array();
  }
  
  bool Context::HasSameSecurityTokenAs(Context* that) {
    return this->native_context()->security_token() ==
           that->native_context()->security_token();
  }
  
  
  #define NATIVE_CONTEXT_FIELD_ACCESSORS(index, type, name) \
    void Context::set_##name(type* value) {                 \
      DCHECK(IsNativeContext());                            \
      set(index, value);                                    \
    }                                                       \
    bool Context::is_##name(type* value) {                  \
      DCHECK(IsNativeContext());                            \
      return type::cast(get(index)) == value;               \
    }                                                       \
    type* Context::name() {                                 \
      DCHECK(IsNativeContext());                            \
      return type::cast(get(index));                        \
    }
  NATIVE_CONTEXT_FIELDS(NATIVE_CONTEXT_FIELD_ACCESSORS)
  #undef NATIVE_CONTEXT_FIELD_ACCESSORS
  
  
  }  // namespace internal
  }  // namespace v8
  
  #endif  // V8_CONTEXTS_INL_H_
  