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Complete support for outline existential storage

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... or so I believe
This commit is contained in:
Arnold Schwaighofer
2025-11-12 13:51:41 -08:00
parent eda5eadfd4
commit 62ac48a17e
7 changed files with 159 additions and 16 deletions
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40
stdlib/public/core/EmbeddedRuntime.swift
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@@ -263,7 +263,7 @@ public func swift_allocEmptyBox() -> Builtin.RawPointer {
@_silgen_name("swift_allocBox")
public func swift_allocBox(metadata: Builtin.RawPointer) -> (Builtin.RawPointer, Builtin.RawPointer) {
public func swift_allocBox(_ metadata: Builtin.RawPointer) -> (Builtin.RawPointer, Builtin.RawPointer) {
let alignMask = Int(unsafe _swift_embedded_metadata_get_align_mask(UnsafeMutableRawPointer(metadata)))
let size = Int(unsafe _swift_embedded_metadata_get_size(UnsafeMutableRawPointer(metadata)))
let headerSize = unsafe MemoryLayout<Int>.size + MemoryLayout<UnsafeRawPointer>.size
@@ -283,12 +283,29 @@ public func swift_allocBox(metadata: Builtin.RawPointer) -> (Builtin.RawPointer,
return (object._rawValue, boxedValueAddr._rawValue)
}
@_cdecl("swift_deallocBox")
public func swift_deallocBox(object: Builtin.RawPointer) {
@c
public func swift_deallocBox(_ object: Builtin.RawPointer) {
unsafe free(UnsafeMutableRawPointer(object))
}
@_silgen_name("swift_makeBoxUnique")
public func swifft_makeBoxUnique(buffer: Builtin.RawPointer, metadata: Builtin.RawPointer, alignMask: Int) -> (Builtin.RawPointer, Builtin.RawPointer){
let addrOfHeapObjectPtr = unsafe UnsafeMutablePointer<Builtin.RawPointer>(buffer)
let box = unsafe addrOfHeapObjectPtr.pointee
let headerSize = unsafe MemoryLayout<Int>.size + MemoryLayout<UnsafeRawPointer>.size
let startOfBoxedValue = ((headerSize + alignMask) & ~alignMask)
let oldObjectAddr = unsafe UnsafeMutableRawPointer(box) + startOfBoxedValue
if !swift_isUniquelyReferenced_native(object: box) {
let refAndObjectAddr = swift_allocBox(metadata)
unsafe _swift_embedded_initialize_box(UnsafeMutableRawPointer(metadata), UnsafeMutableRawPointer(refAndObjectAddr.1), oldObjectAddr)
swift_releaseBox(box)
unsafe addrOfHeapObjectPtr.pointee = refAndObjectAddr.0
return refAndObjectAddr
} else {
return (box, oldObjectAddr._rawValue)
}
}
/// Refcounting
@@ -416,7 +433,7 @@ public func swift_release_n(object: Builtin.RawPointer, n: UInt32) {
unsafe swift_release_n_(object: o, n: n)
}
func swift_release_n_(object: UnsafeMutablePointer<HeapObject>?, n: UInt32) {
func swift_release_n_(object: UnsafeMutablePointer<HeapObject>?, n: UInt32, isBoxRelease: Bool = false) {
guard let object = unsafe object else {
return
}
@@ -441,12 +458,25 @@ func swift_release_n_(object: UnsafeMutablePointer<HeapObject>?, n: UInt32) {
let doNotFree = unsafe (loadedRefcount & HeapObject.doNotFreeBit) != 0
unsafe storeRelaxed(refcount, newValue: HeapObject.immortalRefCount | (doNotFree ? HeapObject.doNotFreeBit : 0))
unsafe _swift_embedded_invoke_heap_object_destroy(object)
if isBoxRelease {
unsafe _swift_embedded_invoke_box_destroy(object)
} else {
unsafe _swift_embedded_invoke_heap_object_destroy(object)
}
} else if resultingRefcount < 0 {
fatalError("negative refcount")
}
}
@c
public func swift_releaseBox(_ object: Builtin.RawPointer) {
if !isValidPointerForNativeRetain(object: object) {
fatalError("not a valid pointer for releaseBox")
}
let o = unsafe UnsafeMutablePointer<HeapObject>(object)
unsafe swift_release_n_(object: o, n: 1, isBoxRelease: true)
}
@c
public func swift_bridgeObjectRelease(object: Builtin.RawPointer) {
swift_bridgeObjectRelease_n(object: object, n: 1)