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// Copyright 2018 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_OBJECTS_TEMPLATES_H_
#define V8_OBJECTS_TEMPLATES_H_
#include "src/handles/handles.h"
#include "src/objects/struct.h"
#include "torque-generated/bit-fields.h"
// Has to be the last include (doesn't have include guards):
#include "src/objects/object-macros.h"
namespace v8 {
class CFunctionInfo;
class StructBodyDescriptor;
namespace internal {
#include "torque-generated/src/objects/templates-tq.inc"
class TemplateInfo : public TorqueGeneratedTemplateInfo<TemplateInfo, Struct> {
public:
static const int kFastTemplateInstantiationsCacheSize = 1 * KB;
// While we could grow the slow cache until we run out of memory, we put
// a limit on it anyway to not crash for embedders that re-create templates
// instead of caching them.
static const int kSlowTemplateInstantiationsCacheSize = 1 * MB;
// If the serial number is set to kDoNotCache, then we should never cache this
// TemplateInfo.
static const int kDoNotCache = -1;
// If the serial number is set to kUncached, it means that this TemplateInfo
// has not been cached yet but it can be.
static const int kUncached = -2;
inline bool should_cache() const;
inline bool is_cached() const;
inline bool TryGetIsolate(Isolate** isolate) const;
inline Isolate* GetIsolateChecked() const;
using BodyDescriptor = StructBodyDescriptor;
TQ_OBJECT_CONSTRUCTORS(TemplateInfo)
};
// Contains data members that are rarely set on a FunctionTemplateInfo.
class FunctionTemplateRareData
: public TorqueGeneratedFunctionTemplateRareData<FunctionTemplateRareData,
Struct> {
public:
DECL_VERIFIER(FunctionTemplateRareData)
using BodyDescriptor = StructBodyDescriptor;
TQ_OBJECT_CONSTRUCTORS(FunctionTemplateRareData)
};
// See the api-exposed FunctionTemplate for more information.
class FunctionTemplateInfo
: public TorqueGeneratedFunctionTemplateInfo<FunctionTemplateInfo,
TemplateInfo> {
public:
#define DECL_RARE_ACCESSORS(Name, CamelName, Type) \
DECL_GETTER(Get##CamelName, Tagged<Type>) \
static inline void Set##CamelName( \
Isolate* isolate, Handle<FunctionTemplateInfo> function_template_info, \
Handle<Type> Name);
// ObjectTemplateInfo or Undefined, used for the prototype property of the
// resulting JSFunction instance of this FunctionTemplate.
DECL_RARE_ACCESSORS(prototype_template, PrototypeTemplate, HeapObject)
// In the case the prototype_template is Undefined we use the
// prototype_provider_template to retrieve the instance prototype. Either
// contains an FunctionTemplateInfo or Undefined.
DECL_RARE_ACCESSORS(prototype_provider_template, PrototypeProviderTemplate,
HeapObject)
// Used to create prototype chains. The parent_template's prototype is set as
// __proto__ of this FunctionTemplate's instance prototype. Is either a
// FunctionTemplateInfo or Undefined.
DECL_RARE_ACCESSORS(parent_template, ParentTemplate, HeapObject)
// Returns an InterceptorInfo or Undefined for named properties.
DECL_RARE_ACCESSORS(named_property_handler, NamedPropertyHandler, HeapObject)
// Returns an InterceptorInfo or Undefined for indexed properties/elements.
DECL_RARE_ACCESSORS(indexed_property_handler, IndexedPropertyHandler,
HeapObject)
// An ObjectTemplateInfo that is used when instantiating the JSFunction
// associated with this FunctionTemplateInfo. Contains either an
// ObjectTemplateInfo or Undefined. A default instance_template is assigned
// upon first instantiation if it's Undefined.
DECL_RARE_ACCESSORS(instance_template, InstanceTemplate, HeapObject)
// Either a CallHandlerInfo or Undefined. If an instance_call_handler is
// provided the instances created from the associated JSFunction are marked as
// callable.
DECL_RARE_ACCESSORS(instance_call_handler, InstanceCallHandler, HeapObject)
DECL_RARE_ACCESSORS(access_check_info, AccessCheckInfo, HeapObject)
DECL_RARE_ACCESSORS(c_function_overloads, CFunctionOverloads, FixedArray)
#undef DECL_RARE_ACCESSORS
// Begin flag bits ---------------------
DECL_BOOLEAN_ACCESSORS(undetectable)
// If set, object instances created by this function
// requires access check.
DECL_BOOLEAN_ACCESSORS(needs_access_check)
DECL_BOOLEAN_ACCESSORS(read_only_prototype)
// If set, do not create a prototype property for the associated
// JSFunction. This bit implies that neither the prototype_template nor the
// prototype_provoider_template are instantiated.
DECL_BOOLEAN_ACCESSORS(remove_prototype)
// If not set an access may be performed on calling the associated JSFunction.
DECL_BOOLEAN_ACCESSORS(accept_any_receiver)
// This flag is used to check that the FunctionTemplateInfo instance is not
// changed after it became visible to TurboFan (either set in a
// SharedFunctionInfo or an accessor), because TF relies on immutability to
// safely read concurrently.
DECL_BOOLEAN_ACCESSORS(published)
// This specifies the permissable range of instance type of objects that can
// be allowed to be used as receivers with the given template.
DECL_INT16_ACCESSORS(allowed_receiver_instance_type_range_start)
DECL_INT16_ACCESSORS(allowed_receiver_instance_type_range_end)
// End flag bits ---------------------
inline int InstanceType() const;
inline void SetInstanceType(int instance_type);
static Handle<SharedFunctionInfo> GetOrCreateSharedFunctionInfo(
Isolate* isolate, Handle<FunctionTemplateInfo> info,
MaybeHandle<Name> maybe_name);
static Handle<SharedFunctionInfo> GetOrCreateSharedFunctionInfo(
LocalIsolate* isolate, Handle<FunctionTemplateInfo> info,
Handle<Name> maybe_name) {
// We don't support streaming compilation of scripts with natives, so we
// don't need an off-thread implementation of this.
UNREACHABLE();
}
// Returns parent function template or a null FunctionTemplateInfo.
inline Tagged<FunctionTemplateInfo> GetParent(Isolate* isolate);
// Returns true if |object| is an instance of this function template.
inline bool IsTemplateFor(Tagged<JSObject> object) const;
bool IsTemplateFor(Tagged<Map> map) const;
// Returns true if |object| is an API object and is constructed by this
// particular function template (skips walking up the chain of inheriting
// functions that is done by IsTemplateFor).
bool IsLeafTemplateForApiObject(Tagged<Object> object) const;
inline bool instantiated();
bool BreakAtEntry(Isolate* isolate);
bool HasInstanceType();
// Helper function for cached accessors.
static base::Optional<Tagged<Name>> TryGetCachedPropertyName(
Isolate* isolate, Tagged<Object> getter);
// Fast API overloads.
int GetCFunctionsCount() const;
Address GetCFunction(int index) const;
const CFunctionInfo* GetCSignature(int index) const;
// CFunction data for a set of overloads is stored into a FixedArray, as
// [address_0, signature_0, ... address_n-1, signature_n-1].
static const int kFunctionOverloadEntrySize = 2;
// Bit position in the flag, from least significant bit position.
DEFINE_TORQUE_GENERATED_FUNCTION_TEMPLATE_INFO_FLAGS()
using BodyDescriptor = StructBodyDescriptor;
private:
// For ease of use of the BITFIELD macro.
inline int32_t relaxed_flag() const;
inline void set_relaxed_flag(int32_t flags);
static constexpr int kNoJSApiObjectType = 0;
static inline Tagged<FunctionTemplateRareData> EnsureFunctionTemplateRareData(
Isolate* isolate, Handle<FunctionTemplateInfo> function_template_info);
static Tagged<FunctionTemplateRareData> AllocateFunctionTemplateRareData(
Isolate* isolate, Handle<FunctionTemplateInfo> function_template_info);
TQ_OBJECT_CONSTRUCTORS(FunctionTemplateInfo)
};
class ObjectTemplateInfo
: public TorqueGeneratedObjectTemplateInfo<ObjectTemplateInfo,
TemplateInfo> {
public:
NEVER_READ_ONLY_SPACE
DECL_INT_ACCESSORS(embedder_field_count)
DECL_BOOLEAN_ACCESSORS(immutable_proto)
DECL_BOOLEAN_ACCESSORS(code_like)
// Starting from given object template's constructor walk up the inheritance
// chain till a function template that has an instance template is found.
inline Tagged<ObjectTemplateInfo> GetParent(Isolate* isolate);
using BodyDescriptor = StructBodyDescriptor;
private:
DEFINE_TORQUE_GENERATED_OBJECT_TEMPLATE_INFO_FLAGS()
TQ_OBJECT_CONSTRUCTORS(ObjectTemplateInfo)
};
} // namespace internal
} // namespace v8
#include "src/objects/object-macros-undef.h"
#endif // V8_OBJECTS_TEMPLATES_H_
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