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// Copyright 2019 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.
@abstract
extern class Name extends PrimitiveHeapObject {
raw_hash_field: NameHash;
}
bitfield struct NameHash extends uint32 {
hash_not_computed: bool: 1 bit;
is_not_integer_index_mask: bool: 1 bit;
array_index_value: uint32: 24 bit;
array_index_length: uint32: 6 bit;
}
// This is the same as Name, but with the information that there are no other
// kinds of names.
type AnyName = PrivateSymbol|PublicSymbol|String;
bitfield struct SymbolFlags extends uint32 {
is_private: bool: 1 bit;
is_well_known_symbol: bool: 1 bit;
is_in_public_symbol_table: bool: 1 bit;
is_interesting_symbol: bool: 1 bit;
is_private_name: bool: 1 bit;
is_private_brand: bool: 1 bit;
}
extern class Symbol extends Name {
flags: SymbolFlags;
description: String|Undefined;
}
type PublicSymbol extends Symbol;
type PrivateSymbol extends Symbol;
const kNameEmptyHashField: NameHash = NameHash{
hash_not_computed: true,
is_not_integer_index_mask: true,
array_index_value: 0,
array_index_length: 0
};
const kMaxCachedArrayIndexLength: constexpr uint32
generates 'Name::kMaxCachedArrayIndexLength';
const kMaxArrayIndexSize: constexpr uint32
generates 'Name::kMaxArrayIndexSize';
const kNofHashBitFields: constexpr int31
generates 'Name::kNofHashBitFields';
const kArrayIndexValueBits: constexpr int31
generates 'Name::kArrayIndexValueBits';
const kDoesNotContainCachedArrayIndexMask: constexpr uint32
generates 'Name::kDoesNotContainCachedArrayIndexMask';
const kIsNotIntegerIndexMask: constexpr uint32
generates 'Name::kIsNotIntegerIndexMask';
macro ContainsCachedArrayIndex(hash: uint32): bool {
return (hash & kDoesNotContainCachedArrayIndexMask) == 0;
}
const kArrayIndexValueBitsShift: uint32 = kNofHashBitFields;
const kArrayIndexLengthBitsShift: uint32 =
kNofHashBitFields + kArrayIndexValueBits;
macro TenToThe(exponent: uint32): uint32 {
assert(exponent <= 9);
let answer: int32 = 1;
for (let i: int32 = 0; i < Signed(exponent); i++) {
answer = answer * 10;
}
return Unsigned(answer);
}
macro MakeArrayIndexHash(value: uint32, length: uint32): NameHash {
// This is in sync with StringHasher::MakeArrayIndexHash.
assert(length <= kMaxArrayIndexSize);
const one: uint32 = 1;
assert(TenToThe(kMaxCachedArrayIndexLength) < (one << kArrayIndexValueBits));
let hash: uint32 = value;
hash = (hash << kArrayIndexValueBitsShift) |
(length << kArrayIndexLengthBitsShift);
assert((hash & kIsNotIntegerIndexMask) == 0);
assert(
(length <= kMaxCachedArrayIndexLength) == ContainsCachedArrayIndex(hash));
return %RawDownCast<NameHash>(hash);
}
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