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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.
#include 'src/builtins/builtins-array-gen.h'
namespace array {
// Naming convention from elements.cc. We have a similar intent but implement
// fastpaths using generics instead of using a class hierarchy for elements
// kinds specific implementations.
type GenericElementsAccessor;
type FastPackedSmiElements;
type FastPackedObjectElements;
type FastPackedDoubleElements;
type FastSmiOrObjectElements;
type FastDoubleElements;
type DictionaryElements;
macro EnsureWriteableFastElements(implicit context: Context)(array: JSArray) {
assert(IsFastElementsKind(array.map.elements_kind));
const elements: FixedArrayBase = array.elements;
if (elements.map != kCOWMap) return;
// There are no COW *_DOUBLE_ELEMENTS arrays, so we are allowed to always
// extract FixedArrays and don't have to worry about FixedDoubleArrays.
assert(IsFastSmiOrTaggedElementsKind(array.map.elements_kind));
const length: Smi = Cast<Smi>(array.length) otherwise unreachable;
array.elements =
ExtractFixedArray(elements, 0, length, length, kFixedArrays);
assert(array.elements.map != kCOWMap);
}
macro LoadElementOrUndefined(implicit context:
Context)(a: FixedArray, i: Smi): JSAny {
const e = UnsafeCast<(JSAny | TheHole)>(a.objects[i]);
return ReplaceTheHoleWithUndefined(e);
}
macro LoadElementOrUndefined(a: FixedDoubleArray, i: Smi): NumberOrUndefined {
const f: float64 = LoadDoubleWithHoleCheck(a, i) otherwise return Undefined;
return AllocateHeapNumberWithValue(f);
}
macro StoreArrayHole(elements: FixedDoubleArray, k: Smi): void {
StoreFixedDoubleArrayHoleSmi(elements, k);
}
macro StoreArrayHole(elements: FixedArray, k: Smi): void {
elements.objects[k] = TheHole;
}
extern macro SetPropertyLength(implicit context: Context)(JSAny, Number);
}