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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_INSTANCE_TYPE_INL_H_
#define V8_OBJECTS_INSTANCE_TYPE_INL_H_
#include "src/objects/instance-type.h"
#include "src/objects/map-inl.h"
#include "src/utils/utils.h"
// Has to be the last include (doesn't have include guards):
#include "src/objects/object-macros.h"
namespace v8 {
namespace internal {
namespace InstanceTypeChecker {
// Define type checkers for classes with single instance type.
INSTANCE_TYPE_CHECKERS_SINGLE(INSTANCE_TYPE_CHECKER)
// Checks if value is in range [lower_limit, higher_limit] using a single
// branch. Assumes that the input instance type is valid.
template <InstanceType lower_limit, InstanceType upper_limit>
struct InstanceRangeChecker {
static constexpr bool Check(InstanceType value) {
return base::IsInRange(value, lower_limit, upper_limit);
}
};
template <InstanceType upper_limit>
struct InstanceRangeChecker<FIRST_TYPE, upper_limit> {
static constexpr bool Check(InstanceType value) {
DCHECK_LE(FIRST_TYPE, value);
return value <= upper_limit;
}
};
template <InstanceType lower_limit>
struct InstanceRangeChecker<lower_limit, LAST_TYPE> {
static constexpr bool Check(InstanceType value) {
DCHECK_GE(LAST_TYPE, value);
return value >= lower_limit;
}
};
// Define type checkers for classes with ranges of instance types.
#define INSTANCE_TYPE_CHECKER_RANGE(type, first_instance_type, \
last_instance_type) \
V8_INLINE bool Is##type(InstanceType instance_type) { \
return InstanceRangeChecker<first_instance_type, \
last_instance_type>::Check(instance_type); \
}
INSTANCE_TYPE_CHECKERS_RANGE(INSTANCE_TYPE_CHECKER_RANGE)
#undef INSTANCE_TYPE_CHECKER_RANGE
V8_INLINE bool IsHeapObject(InstanceType instance_type) { return true; }
V8_INLINE bool IsInternalizedString(InstanceType instance_type) {
STATIC_ASSERT(kNotInternalizedTag != 0);
return (instance_type & (kIsNotStringMask | kIsNotInternalizedMask)) ==
(kStringTag | kInternalizedTag);
}
V8_INLINE bool IsExternalString(InstanceType instance_type) {
return (instance_type & (kIsNotStringMask | kStringRepresentationMask)) ==
kExternalStringTag;
}
} // namespace InstanceTypeChecker
// TODO(v8:7786): For instance types that have a single map instance on the
// roots, and when that map is a embedded in the binary, compare against the map
// pointer rather than looking up the instance type.
INSTANCE_TYPE_CHECKERS(TYPE_CHECKER)
} // namespace internal
} // namespace v8
#include "src/objects/object-macros-undef.h"
#endif // V8_OBJECTS_INSTANCE_TYPE_INL_H_
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