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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.
#ifndef V8_OBJECTS_COMPRESSED_SLOTS_INL_H_
#define V8_OBJECTS_COMPRESSED_SLOTS_INL_H_
#ifdef V8_COMPRESS_POINTERS
#include "src/common/ptr-compr-inl.h"
#include "src/objects/compressed-slots.h"
#include "src/objects/maybe-object-inl.h"
namespace v8::internal {
//
// CompressedObjectSlot implementation.
//
CompressedObjectSlot::CompressedObjectSlot(Object* object)
: SlotBase(reinterpret_cast<Address>(&object->ptr_)) {}
bool CompressedObjectSlot::contains_value(Address raw_value) const {
AtomicTagged_t value = AsAtomicTagged::Relaxed_Load(location());
return static_cast<uint32_t>(value) ==
static_cast<uint32_t>(static_cast<Tagged_t>(raw_value));
}
bool CompressedObjectSlot::contains_map_value(Address raw_value) const {
// Simply forward to contains_value because map packing is not supported with
// pointer compression.
DCHECK(!V8_MAP_PACKING_BOOL);
return contains_value(raw_value);
}
Object CompressedObjectSlot::operator*() const {
Tagged_t value = *location();
return Object(TCompressionScheme::DecompressTagged(address(), value));
}
Object CompressedObjectSlot::load(PtrComprCageBase cage_base) const {
Tagged_t value = *location();
return Object(TCompressionScheme::DecompressTagged(cage_base, value));
}
void CompressedObjectSlot::store(Object value) const {
*location() = TCompressionScheme::CompressObject(value.ptr());
}
void CompressedObjectSlot::store_map(Map map) const {
// Simply forward to store because map packing is not supported with pointer
// compression.
DCHECK(!V8_MAP_PACKING_BOOL);
store(map);
}
Map CompressedObjectSlot::load_map() const {
// Simply forward to Relaxed_Load because map packing is not supported with
// pointer compression.
DCHECK(!V8_MAP_PACKING_BOOL);
return Map::unchecked_cast(Relaxed_Load());
}
Object CompressedObjectSlot::Acquire_Load() const {
AtomicTagged_t value = AsAtomicTagged::Acquire_Load(location());
return Object(TCompressionScheme::DecompressTagged(address(), value));
}
Object CompressedObjectSlot::Relaxed_Load() const {
AtomicTagged_t value = AsAtomicTagged::Relaxed_Load(location());
return Object(TCompressionScheme::DecompressTagged(address(), value));
}
Object CompressedObjectSlot::Relaxed_Load(PtrComprCageBase cage_base) const {
AtomicTagged_t value = AsAtomicTagged::Relaxed_Load(location());
return Object(TCompressionScheme::DecompressTagged(cage_base, value));
}
void CompressedObjectSlot::Relaxed_Store(Object value) const {
Tagged_t ptr = TCompressionScheme::CompressObject(value.ptr());
AsAtomicTagged::Relaxed_Store(location(), ptr);
}
void CompressedObjectSlot::Release_Store(Object value) const {
Tagged_t ptr = TCompressionScheme::CompressObject(value.ptr());
AsAtomicTagged::Release_Store(location(), ptr);
}
Object CompressedObjectSlot::Release_CompareAndSwap(Object old,
Object target) const {
Tagged_t old_ptr = TCompressionScheme::CompressObject(old.ptr());
Tagged_t target_ptr = TCompressionScheme::CompressObject(target.ptr());
Tagged_t result =
AsAtomicTagged::Release_CompareAndSwap(location(), old_ptr, target_ptr);
return Object(TCompressionScheme::DecompressTagged(address(), result));
}
//
// CompressedMaybeObjectSlot implementation.
//
MaybeObject CompressedMaybeObjectSlot::operator*() const {
Tagged_t value = *location();
return MaybeObject(TCompressionScheme::DecompressTagged(address(), value));
}
MaybeObject CompressedMaybeObjectSlot::load(PtrComprCageBase cage_base) const {
Tagged_t value = *location();
return MaybeObject(TCompressionScheme::DecompressTagged(cage_base, value));
}
void CompressedMaybeObjectSlot::store(MaybeObject value) const {
*location() = TCompressionScheme::CompressAny(value.ptr());
}
MaybeObject CompressedMaybeObjectSlot::Relaxed_Load() const {
AtomicTagged_t value = AsAtomicTagged::Relaxed_Load(location());
return MaybeObject(TCompressionScheme::DecompressTagged(address(), value));
}
MaybeObject CompressedMaybeObjectSlot::Relaxed_Load(
PtrComprCageBase cage_base) const {
AtomicTagged_t value = AsAtomicTagged::Relaxed_Load(location());
return MaybeObject(TCompressionScheme::DecompressTagged(cage_base, value));
}
void CompressedMaybeObjectSlot::Relaxed_Store(MaybeObject value) const {
Tagged_t ptr = TCompressionScheme::CompressAny(value.ptr());
AsAtomicTagged::Relaxed_Store(location(), ptr);
}
void CompressedMaybeObjectSlot::Release_CompareAndSwap(
MaybeObject old, MaybeObject target) const {
Tagged_t old_ptr = TCompressionScheme::CompressAny(old.ptr());
Tagged_t target_ptr = TCompressionScheme::CompressAny(target.ptr());
AsAtomicTagged::Release_CompareAndSwap(location(), old_ptr, target_ptr);
}
//
// CompressedHeapObjectSlot implementation.
//
HeapObjectReference CompressedHeapObjectSlot::operator*() const {
Tagged_t value = *location();
return HeapObjectReference(
TCompressionScheme::DecompressTagged(address(), value));
}
HeapObjectReference CompressedHeapObjectSlot::load(
PtrComprCageBase cage_base) const {
Tagged_t value = *location();
return HeapObjectReference(
TCompressionScheme::DecompressTagged(cage_base, value));
}
void CompressedHeapObjectSlot::store(HeapObjectReference value) const {
*location() = TCompressionScheme::CompressObject(value.ptr());
}
HeapObject CompressedHeapObjectSlot::ToHeapObject() const {
Tagged_t value = *location();
DCHECK(HAS_STRONG_HEAP_OBJECT_TAG(value));
return HeapObject::cast(
Object(TCompressionScheme::DecompressTagged(address(), value)));
}
void CompressedHeapObjectSlot::StoreHeapObject(HeapObject value) const {
*location() = TCompressionScheme::CompressObject(value.ptr());
}
//
// OffHeapCompressedObjectSlot implementation.
//
template <typename CompressionScheme>
Object OffHeapCompressedObjectSlot<CompressionScheme>::load(
PtrComprCageBase cage_base) const {
Tagged_t value = *TSlotBase::location();
return Object(CompressionScheme::DecompressTagged(cage_base, value));
}
template <typename CompressionScheme>
void OffHeapCompressedObjectSlot<CompressionScheme>::store(Object value) const {
*TSlotBase::location() = CompressionScheme::CompressObject(value.ptr());
}
template <typename CompressionScheme>
Object OffHeapCompressedObjectSlot<CompressionScheme>::Relaxed_Load(
PtrComprCageBase cage_base) const {
AtomicTagged_t value = AsAtomicTagged::Relaxed_Load(TSlotBase::location());
return Object(CompressionScheme::DecompressTagged(cage_base, value));
}
template <typename CompressionScheme>
Object OffHeapCompressedObjectSlot<CompressionScheme>::Acquire_Load(
PtrComprCageBase cage_base) const {
AtomicTagged_t value = AsAtomicTagged::Acquire_Load(TSlotBase::location());
return Object(CompressionScheme::DecompressTagged(cage_base, value));
}
template <typename CompressionScheme>
void OffHeapCompressedObjectSlot<CompressionScheme>::Relaxed_Store(
Object value) const {
Tagged_t ptr = CompressionScheme::CompressObject(value.ptr());
AsAtomicTagged::Relaxed_Store(TSlotBase::location(), ptr);
}
template <typename CompressionScheme>
void OffHeapCompressedObjectSlot<CompressionScheme>::Release_Store(
Object value) const {
Tagged_t ptr = CompressionScheme::CompressObject(value.ptr());
AsAtomicTagged::Release_Store(TSlotBase::location(), ptr);
}
template <typename CompressionScheme>
void OffHeapCompressedObjectSlot<CompressionScheme>::Release_CompareAndSwap(
Object old, Object target) const {
Tagged_t old_ptr = CompressionScheme::CompressObject(old.ptr());
Tagged_t target_ptr = CompressionScheme::CompressObject(target.ptr());
AsAtomicTagged::Release_CompareAndSwap(TSlotBase::location(), old_ptr,
target_ptr);
}
} // namespace v8::internal
#endif // V8_COMPRESS_POINTERS
#endif // V8_OBJECTS_COMPRESSED_SLOTS_INL_H_
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