src/contexts-inl.h - v8/v8 - Git at Google

 // 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/heap/heap-write-barrier.h"
 #include "src/objects-inl.h"
 #include "src/objects/dictionary-inl.h"
 #include "src/objects/fixed-array-inl.h"
 #include "src/objects/js-objects-inl.h"
 #include "src/objects/map-inl.h"
 #include "src/objects/regexp-match-info.h"
 #include "src/objects/scope-info.h"
 #include "src/objects/shared-function-info.h"

 // Has to be the last include (doesn't have include guards):
 #include "src/objects/object-macros.h"

 namespace v8 {
 namespace internal {

 OBJECT_CONSTRUCTORS_IMPL(ScriptContextTable, FixedArray)
 CAST_ACCESSOR(ScriptContextTable)

 int ScriptContextTable::used() const { return Smi::ToInt(get(kUsedSlotIndex)); }

 void ScriptContextTable::set_used(int used) {
   set(kUsedSlotIndex, Smi::FromInt(used));
 }

 // static
 Handle<Context> ScriptContextTable::GetContext(Isolate* isolate,
                                                Handle<ScriptContextTable> table,
                                                int i) {
   return handle(table->get_context(i), isolate);
 }

 Context ScriptContextTable::get_context(int i) const {
   DCHECK_LT(i, used());
   return Context::cast(this->get(i + kFirstContextSlotIndex));
 }

 OBJECT_CONSTRUCTORS_IMPL(Context, HeapObject)
 NEVER_READ_ONLY_SPACE_IMPL(Context)
 CAST_ACCESSOR(Context)
 SMI_ACCESSORS(Context, length, kLengthOffset)

 CAST_ACCESSOR(NativeContext)

 Object Context::get(int index) const {
   DCHECK_LT(static_cast<unsigned>(index),
             static_cast<unsigned>(this->length()));
   return RELAXED_READ_FIELD(*this, OffsetOfElementAt(index));
 }

 void Context::set(int index, Object value) {
   DCHECK_LT(static_cast<unsigned>(index),
             static_cast<unsigned>(this->length()));
   int offset = OffsetOfElementAt(index);
   RELAXED_WRITE_FIELD(*this, offset, value);
   WRITE_BARRIER(*this, offset, value);
 }

 void Context::set(int index, Object value, WriteBarrierMode mode) {
   DCHECK_LT(static_cast<unsigned>(index),
             static_cast<unsigned>(this->length()));
   int offset = OffsetOfElementAt(index);
   RELAXED_WRITE_FIELD(*this, offset, value);
   CONDITIONAL_WRITE_BARRIER(*this, offset, value, mode);
 }

 void Context::set_scope_info(ScopeInfo scope_info) {
   set(SCOPE_INFO_INDEX, scope_info);
 }

 Object Context::unchecked_previous() { return get(PREVIOUS_INDEX); }

 Context Context::previous() {
   Object result = get(PREVIOUS_INDEX);
   DCHECK(IsBootstrappingOrValidParentContext(result, *this));
   return Context::unchecked_cast(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(); }
 HeapObject Context::extension() {
   return HeapObject::cast(get(EXTENSION_INDEX));
 }
 void Context::set_extension(HeapObject object) { set(EXTENSION_INDEX, object); }

 NativeContext Context::native_context() const {
   Object result = get(NATIVE_CONTEXT_INDEX);
   DCHECK(IsBootstrappingOrNativeContext(this->GetIsolate(), result));
   return NativeContext::unchecked_cast(result);
 }

 void Context::set_native_context(NativeContext context) {
   set(NATIVE_CONTEXT_INDEX, context);
 }

 bool Context::IsFunctionContext() const {
   return map()->instance_type() == FUNCTION_CONTEXT_TYPE;
 }

 bool Context::IsCatchContext() const {
   return map()->instance_type() == CATCH_CONTEXT_TYPE;
 }

 bool Context::IsWithContext() const {
   return map()->instance_type() == WITH_CONTEXT_TYPE;
 }

 bool Context::IsDebugEvaluateContext() const {
   return map()->instance_type() == DEBUG_EVALUATE_CONTEXT_TYPE;
 }

 bool Context::IsAwaitContext() const {
   return map()->instance_type() == AWAIT_CONTEXT_TYPE;
 }

 bool Context::IsBlockContext() const {
   return map()->instance_type() == BLOCK_CONTEXT_TYPE;
 }

 bool Context::IsModuleContext() const {
   return map()->instance_type() == MODULE_CONTEXT_TYPE;
 }

 bool Context::IsEvalContext() const {
   return map()->instance_type() == EVAL_CONTEXT_TYPE;
 }

 bool Context::IsScriptContext() const {
   return map()->instance_type() == SCRIPT_CONTEXT_TYPE;
 }

 bool Context::HasSameSecurityTokenAs(Context that) const {
   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) const {             \
     DCHECK(IsNativeContext());                            \
     return type::cast(get(index)) == value;               \
   }                                                       \
   type Context::name() const {                            \
     DCHECK(IsNativeContext());                            \
     return type::cast(get(index));                        \
   }
 NATIVE_CONTEXT_FIELDS(NATIVE_CONTEXT_FIELD_ACCESSORS)
 #undef NATIVE_CONTEXT_FIELD_ACCESSORS

 #define CHECK_FOLLOWS2(v1, v2) STATIC_ASSERT((v1 + 1) == (v2))
 #define CHECK_FOLLOWS4(v1, v2, v3, v4) \
   CHECK_FOLLOWS2(v1, v2);              \
   CHECK_FOLLOWS2(v2, v3);              \
   CHECK_FOLLOWS2(v3, v4)

 int Context::FunctionMapIndex(LanguageMode language_mode, FunctionKind kind,
                               bool has_shared_name, bool needs_home_object) {
   if (IsClassConstructor(kind)) {
     // Like the strict function map, but with no 'name' accessor. 'name'
     // needs to be the last property and it is added during instantiation,
     // in case a static property with the same name exists"
     return CLASS_FUNCTION_MAP_INDEX;
   }

   int base = 0;
   if (IsGeneratorFunction(kind)) {
     CHECK_FOLLOWS4(GENERATOR_FUNCTION_MAP_INDEX,
                    GENERATOR_FUNCTION_WITH_NAME_MAP_INDEX,
                    GENERATOR_FUNCTION_WITH_HOME_OBJECT_MAP_INDEX,
                    GENERATOR_FUNCTION_WITH_NAME_AND_HOME_OBJECT_MAP_INDEX);
     CHECK_FOLLOWS4(
         ASYNC_GENERATOR_FUNCTION_MAP_INDEX,
         ASYNC_GENERATOR_FUNCTION_WITH_NAME_MAP_INDEX,
         ASYNC_GENERATOR_FUNCTION_WITH_HOME_OBJECT_MAP_INDEX,
         ASYNC_GENERATOR_FUNCTION_WITH_NAME_AND_HOME_OBJECT_MAP_INDEX);

     base = IsAsyncFunction(kind) ? ASYNC_GENERATOR_FUNCTION_MAP_INDEX
                                  : GENERATOR_FUNCTION_MAP_INDEX;

   } else if (IsAsyncFunction(kind)) {
     CHECK_FOLLOWS4(ASYNC_FUNCTION_MAP_INDEX, ASYNC_FUNCTION_WITH_NAME_MAP_INDEX,
                    ASYNC_FUNCTION_WITH_HOME_OBJECT_MAP_INDEX,
                    ASYNC_FUNCTION_WITH_NAME_AND_HOME_OBJECT_MAP_INDEX);

     base = ASYNC_FUNCTION_MAP_INDEX;

   } else if (IsStrictFunctionWithoutPrototype(kind)) {
     DCHECK_IMPLIES(IsArrowFunction(kind), !needs_home_object);
     CHECK_FOLLOWS4(STRICT_FUNCTION_WITHOUT_PROTOTYPE_MAP_INDEX,
                    METHOD_WITH_NAME_MAP_INDEX,
                    METHOD_WITH_HOME_OBJECT_MAP_INDEX,
                    METHOD_WITH_NAME_AND_HOME_OBJECT_MAP_INDEX);

     base = STRICT_FUNCTION_WITHOUT_PROTOTYPE_MAP_INDEX;

   } else {
     DCHECK(!needs_home_object);
     CHECK_FOLLOWS2(SLOPPY_FUNCTION_MAP_INDEX,
                    SLOPPY_FUNCTION_WITH_NAME_MAP_INDEX);
     CHECK_FOLLOWS2(STRICT_FUNCTION_MAP_INDEX,
                    STRICT_FUNCTION_WITH_NAME_MAP_INDEX);

     base = is_strict(language_mode) ? STRICT_FUNCTION_MAP_INDEX
                                     : SLOPPY_FUNCTION_MAP_INDEX;
   }
   int offset = static_cast<int>(!has_shared_name) |
                (static_cast<int>(needs_home_object) << 1);
   DCHECK_EQ(0, offset & ~3);

   return base + offset;
 }

 #undef CHECK_FOLLOWS2
 #undef CHECK_FOLLOWS4

 Map Context::GetInitialJSArrayMap(ElementsKind kind) const {
   DCHECK(IsNativeContext());
   if (!IsFastElementsKind(kind)) return Map();
   DisallowHeapAllocation no_gc;
   Object const initial_js_array_map = get(Context::ArrayMapIndex(kind));
   DCHECK(!initial_js_array_map->IsUndefined());
   return Map::cast(initial_js_array_map);
 }

 MicrotaskQueue* NativeContext::microtask_queue() const {
   return reinterpret_cast<MicrotaskQueue*>(
       READ_INTPTR_FIELD(*this, kMicrotaskQueueOffset));
 }

 void NativeContext::set_microtask_queue(MicrotaskQueue* microtask_queue) {
   WRITE_INTPTR_FIELD(*this, kMicrotaskQueueOffset,
                      reinterpret_cast<intptr_t>(microtask_queue));
 }

 OBJECT_CONSTRUCTORS_IMPL(NativeContext, Context)

 }  // namespace internal
 }  // namespace v8

 #include "src/objects/object-macros-undef.h"

 #endif  // V8_CONTEXTS_INL_H_
	// 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/heap/heap-write-barrier.h"
	#include "src/objects-inl.h"
	#include "src/objects/dictionary-inl.h"
	#include "src/objects/fixed-array-inl.h"
	#include "src/objects/js-objects-inl.h"
	#include "src/objects/map-inl.h"
	#include "src/objects/regexp-match-info.h"
	#include "src/objects/scope-info.h"
	#include "src/objects/shared-function-info.h"

	// Has to be the last include (doesn't have include guards):
	#include "src/objects/object-macros.h"

	namespace v8 {
	namespace internal {

	OBJECT_CONSTRUCTORS_IMPL(ScriptContextTable, FixedArray)
	CAST_ACCESSOR(ScriptContextTable)

	int ScriptContextTable::used() const { return Smi::ToInt(get(kUsedSlotIndex)); }

	void ScriptContextTable::set_used(int used) {
	set(kUsedSlotIndex, Smi::FromInt(used));
	}

	// static
	Handle<Context> ScriptContextTable::GetContext(Isolate* isolate,
	Handle<ScriptContextTable> table,
	int i) {
	return handle(table->get_context(i), isolate);
	}

	Context ScriptContextTable::get_context(int i) const {
	DCHECK_LT(i, used());
	return Context::cast(this->get(i + kFirstContextSlotIndex));
	}

	OBJECT_CONSTRUCTORS_IMPL(Context, HeapObject)
	NEVER_READ_ONLY_SPACE_IMPL(Context)
	CAST_ACCESSOR(Context)
	SMI_ACCESSORS(Context, length, kLengthOffset)

	CAST_ACCESSOR(NativeContext)

	Object Context::get(int index) const {
	DCHECK_LT(static_cast<unsigned>(index),
	static_cast<unsigned>(this->length()));
	return RELAXED_READ_FIELD(*this, OffsetOfElementAt(index));
	}

	void Context::set(int index, Object value) {
	DCHECK_LT(static_cast<unsigned>(index),
	static_cast<unsigned>(this->length()));
	int offset = OffsetOfElementAt(index);
	RELAXED_WRITE_FIELD(*this, offset, value);
	WRITE_BARRIER(*this, offset, value);
	}

	void Context::set(int index, Object value, WriteBarrierMode mode) {
	DCHECK_LT(static_cast<unsigned>(index),
	static_cast<unsigned>(this->length()));
	int offset = OffsetOfElementAt(index);
	RELAXED_WRITE_FIELD(*this, offset, value);
	CONDITIONAL_WRITE_BARRIER(*this, offset, value, mode);
	}

	void Context::set_scope_info(ScopeInfo scope_info) {
	set(SCOPE_INFO_INDEX, scope_info);
	}

	Object Context::unchecked_previous() { return get(PREVIOUS_INDEX); }

	Context Context::previous() {
	Object result = get(PREVIOUS_INDEX);
	DCHECK(IsBootstrappingOrValidParentContext(result, *this));
	return Context::unchecked_cast(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(); }
	HeapObject Context::extension() {
	return HeapObject::cast(get(EXTENSION_INDEX));
	}
	void Context::set_extension(HeapObject object) { set(EXTENSION_INDEX, object); }

	NativeContext Context::native_context() const {
	Object result = get(NATIVE_CONTEXT_INDEX);
	DCHECK(IsBootstrappingOrNativeContext(this->GetIsolate(), result));
	return NativeContext::unchecked_cast(result);
	}

	void Context::set_native_context(NativeContext context) {
	set(NATIVE_CONTEXT_INDEX, context);
	}

	bool Context::IsFunctionContext() const {
	return map()->instance_type() == FUNCTION_CONTEXT_TYPE;
	}

	bool Context::IsCatchContext() const {
	return map()->instance_type() == CATCH_CONTEXT_TYPE;
	}

	bool Context::IsWithContext() const {
	return map()->instance_type() == WITH_CONTEXT_TYPE;
	}

	bool Context::IsDebugEvaluateContext() const {
	return map()->instance_type() == DEBUG_EVALUATE_CONTEXT_TYPE;
	}

	bool Context::IsAwaitContext() const {
	return map()->instance_type() == AWAIT_CONTEXT_TYPE;
	}

	bool Context::IsBlockContext() const {
	return map()->instance_type() == BLOCK_CONTEXT_TYPE;
	}

	bool Context::IsModuleContext() const {
	return map()->instance_type() == MODULE_CONTEXT_TYPE;
	}

	bool Context::IsEvalContext() const {
	return map()->instance_type() == EVAL_CONTEXT_TYPE;
	}

	bool Context::IsScriptContext() const {
	return map()->instance_type() == SCRIPT_CONTEXT_TYPE;
	}

	bool Context::HasSameSecurityTokenAs(Context that) const {
	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) const { \
	DCHECK(IsNativeContext()); \
	return type::cast(get(index)) == value; \
	} \
	type Context::name() const { \
	DCHECK(IsNativeContext()); \
	return type::cast(get(index)); \
	}
	NATIVE_CONTEXT_FIELDS(NATIVE_CONTEXT_FIELD_ACCESSORS)
	#undef NATIVE_CONTEXT_FIELD_ACCESSORS

	#define CHECK_FOLLOWS2(v1, v2) STATIC_ASSERT((v1 + 1) == (v2))
	#define CHECK_FOLLOWS4(v1, v2, v3, v4) \
	CHECK_FOLLOWS2(v1, v2); \
	CHECK_FOLLOWS2(v2, v3); \
	CHECK_FOLLOWS2(v3, v4)

	int Context::FunctionMapIndex(LanguageMode language_mode, FunctionKind kind,
	bool has_shared_name, bool needs_home_object) {
	if (IsClassConstructor(kind)) {
	// Like the strict function map, but with no 'name' accessor. 'name'
	// needs to be the last property and it is added during instantiation,
	// in case a static property with the same name exists"
	return CLASS_FUNCTION_MAP_INDEX;
	}

	int base = 0;
	if (IsGeneratorFunction(kind)) {
	CHECK_FOLLOWS4(GENERATOR_FUNCTION_MAP_INDEX,
	GENERATOR_FUNCTION_WITH_NAME_MAP_INDEX,
	GENERATOR_FUNCTION_WITH_HOME_OBJECT_MAP_INDEX,
	GENERATOR_FUNCTION_WITH_NAME_AND_HOME_OBJECT_MAP_INDEX);
	CHECK_FOLLOWS4(
	ASYNC_GENERATOR_FUNCTION_MAP_INDEX,
	ASYNC_GENERATOR_FUNCTION_WITH_NAME_MAP_INDEX,
	ASYNC_GENERATOR_FUNCTION_WITH_HOME_OBJECT_MAP_INDEX,
	ASYNC_GENERATOR_FUNCTION_WITH_NAME_AND_HOME_OBJECT_MAP_INDEX);

	base = IsAsyncFunction(kind) ? ASYNC_GENERATOR_FUNCTION_MAP_INDEX
	: GENERATOR_FUNCTION_MAP_INDEX;

	} else if (IsAsyncFunction(kind)) {
	CHECK_FOLLOWS4(ASYNC_FUNCTION_MAP_INDEX, ASYNC_FUNCTION_WITH_NAME_MAP_INDEX,
	ASYNC_FUNCTION_WITH_HOME_OBJECT_MAP_INDEX,
	ASYNC_FUNCTION_WITH_NAME_AND_HOME_OBJECT_MAP_INDEX);

	base = ASYNC_FUNCTION_MAP_INDEX;

	} else if (IsStrictFunctionWithoutPrototype(kind)) {
	DCHECK_IMPLIES(IsArrowFunction(kind), !needs_home_object);
	CHECK_FOLLOWS4(STRICT_FUNCTION_WITHOUT_PROTOTYPE_MAP_INDEX,
	METHOD_WITH_NAME_MAP_INDEX,
	METHOD_WITH_HOME_OBJECT_MAP_INDEX,
	METHOD_WITH_NAME_AND_HOME_OBJECT_MAP_INDEX);

	base = STRICT_FUNCTION_WITHOUT_PROTOTYPE_MAP_INDEX;

	} else {
	DCHECK(!needs_home_object);
	CHECK_FOLLOWS2(SLOPPY_FUNCTION_MAP_INDEX,
	SLOPPY_FUNCTION_WITH_NAME_MAP_INDEX);
	CHECK_FOLLOWS2(STRICT_FUNCTION_MAP_INDEX,
	STRICT_FUNCTION_WITH_NAME_MAP_INDEX);

	base = is_strict(language_mode) ? STRICT_FUNCTION_MAP_INDEX
	: SLOPPY_FUNCTION_MAP_INDEX;
	}
	int offset = static_cast<int>(!has_shared_name) \|
	(static_cast<int>(needs_home_object) << 1);
	DCHECK_EQ(0, offset & ~3);

	return base + offset;
	}

	#undef CHECK_FOLLOWS2
	#undef CHECK_FOLLOWS4

	Map Context::GetInitialJSArrayMap(ElementsKind kind) const {
	DCHECK(IsNativeContext());
	if (!IsFastElementsKind(kind)) return Map();
	DisallowHeapAllocation no_gc;
	Object const initial_js_array_map = get(Context::ArrayMapIndex(kind));
	DCHECK(!initial_js_array_map->IsUndefined());
	return Map::cast(initial_js_array_map);
	}

	MicrotaskQueue* NativeContext::microtask_queue() const {
	return reinterpret_cast<MicrotaskQueue*>(
	READ_INTPTR_FIELD(*this, kMicrotaskQueueOffset));
	}

	void NativeContext::set_microtask_queue(MicrotaskQueue* microtask_queue) {
	WRITE_INTPTR_FIELD(*this, kMicrotaskQueueOffset,
	reinterpret_cast<intptr_t>(microtask_queue));
	}

	OBJECT_CONSTRUCTORS_IMPL(NativeContext, Context)

	} // namespace internal
	} // namespace v8

	#include "src/objects/object-macros-undef.h"

	#endif // V8_CONTEXTS_INL_H_