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Merged
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May 31, 2019
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De-underscore @frozen, apply it to structs #24185

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a03f0fc
De-underscore @frozen for enums
airspeedswift Apr 13, 2019
aa5edd4
Add @frozen for structs, deprecate @_fixed_layout for them
airspeedswift Apr 20, 2019
41cb6bd
Switch usage from _fixed_layout to frozen
airspeedswift Apr 20, 2019
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5 changes: 3 additions & 2 deletions include/swift/AST/Attr.def
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Expand Up @@ -364,10 +364,11 @@ SIMPLE_DECL_ATTR(_weakLinked, WeakLinked,
OnNominalType | OnAssociatedType | OnFunc | OnAccessor | OnVar |
OnSubscript | OnConstructor | OnEnumElement | OnExtension | UserInaccessible,
75)
SIMPLE_DECL_ATTR(_frozen, Frozen,
OnEnum |
SIMPLE_DECL_ATTR(frozen, Frozen,
OnEnum | OnStruct |
UserInaccessible,
76)
DECL_ATTR_ALIAS(_frozen, Frozen)
SIMPLE_DECL_ATTR(_forbidSerializingReference, ForbidSerializingReference,
OnAnyDecl |
LongAttribute | RejectByParser | UserInaccessible | NotSerialized,
Expand Down
2 changes: 1 addition & 1 deletion include/swift/AST/Decl.h
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Expand Up @@ -5064,7 +5064,7 @@ class VarDecl : public AbstractStorageDecl {
/// exposed to clients.
/// There's a very narrow case when we would: if the decl is an instance
/// member with an initializer expression and the parent type is
/// @_fixed_layout and resides in a resilient module.
/// @frozen and resides in a resilient module.
bool isInitExposedToClients() const;

/// Is this a special debugger variable?
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19 changes: 14 additions & 5 deletions include/swift/AST/DiagnosticsSema.def
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Expand Up @@ -1388,8 +1388,8 @@ WARNING(pattern_type_not_usable_from_inline_warn,none,
"%select{%select{variable|constant}0|property}1 "
"should be '@usableFromInline' or public",
(bool, bool))
ERROR(pattern_type_not_usable_from_inline_fixed_layout,none,
"type referenced from a stored property in a '@_fixed_layout' struct must "
ERROR(pattern_type_not_usable_from_inline_frozen,none,
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Do we use this diagnostic for classes too? If so it needs a %choice

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I bet we do, but it also says "struct" in the message, so…

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Yeah it was always struct-specific even if it applies to both. I'll happily correct it but I'd like to do that in a follow-on PR than lump it in here.

"type referenced from a stored property in a '@frozen' struct must "
"be '@usableFromInline' or public",
(/*ignored*/bool, /*ignored*/bool))
ERROR(pattern_type_not_usable_from_inline_inferred,none,
Expand All @@ -1404,9 +1404,9 @@ WARNING(pattern_type_not_usable_from_inline_inferred_warn,none,
"with inferred type %2 "
"should be '@usableFromInline' or public",
(bool, bool, Type))
ERROR(pattern_type_not_usable_from_inline_inferred_fixed_layout,none,
ERROR(pattern_type_not_usable_from_inline_inferred_frozen,none,
"type referenced from a stored property with inferred type %2 in a "
"'@_fixed_layout' struct must be '@usableFromInline' or public",
"'@frozen' struct must be '@usableFromInline' or public",
(/*ignored*/bool, /*ignored*/bool, Type))

ERROR(pattern_binds_no_variables,none,
Expand Down Expand Up @@ -4136,6 +4136,15 @@ ERROR(fixed_layout_attr_on_internal_type,
"%select{private|fileprivate|internal|%error|%error}1",
(DeclName, AccessLevel))

WARNING(fixed_layout_struct,
none, "'@frozen' attribute is now used for fixed-layout structs", ())
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Nitpick: please pick either '@frozen' or 'frozen' attribute (both here and below); having both is redundant.


ERROR(frozen_attr_on_internal_type,
none, "'@frozen' attribute can only be applied to '@usableFromInline' "
"or public declarations, but %0 is "
"%select{private|fileprivate|internal|%error|%error}1",
(DeclName, AccessLevel))

ERROR(usable_from_inline_attr_with_explicit_access,
none, "'@usableFromInline' attribute can only be applied to internal "
"declarations, but %0 is %select{private|fileprivate|%error|public|open}1",
Expand All @@ -4152,7 +4161,7 @@ ERROR(usable_from_inline_attr_in_protocol,none,
"an '@inlinable' function|" \
"an '@_alwaysEmitIntoClient' function|" \
"a default argument value|" \
"a property initializer in a '@_fixed_layout' type}"
"a property initializer in a '@frozen' type}"

#define DECL_OR_ACCESSOR "%select{%0|%0 for}"

Expand Down
5 changes: 3 additions & 2 deletions lib/AST/Decl.cpp
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Expand Up @@ -1516,7 +1516,8 @@ bool VarDecl::isInitExposedToClients() const {
if (!parent) return false;
if (!hasInitialValue()) return false;
if (isStatic()) return false;
return parent->getAttrs().hasAttribute<FixedLayoutAttr>();
return parent->getAttrs().hasAttribute<FrozenAttr>() ||
parent->getAttrs().hasAttribute<FixedLayoutAttr>();
}

/// Check whether the given type representation will be
Expand Down Expand Up @@ -3188,7 +3189,7 @@ bool NominalTypeDecl::isFormallyResilient() const {
/*treatUsableFromInlineAsPublic=*/true).isPublic())
return false;

// Check for an explicit @_fixed_layout or @_frozen attribute.
// Check for an explicit @_fixed_layout or @frozen attribute.
if (getAttrs().hasAttribute<FixedLayoutAttr>() ||
getAttrs().hasAttribute<FrozenAttr>()) {
return false;
Expand Down
2 changes: 1 addition & 1 deletion lib/ClangImporter/ImportDecl.cpp
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Expand Up @@ -2730,7 +2730,7 @@ namespace {
errorWrapper->setAddedImplicitInitializers();
errorWrapper->setAccess(AccessLevel::Public);
errorWrapper->getAttrs().add(
new (Impl.SwiftContext) FixedLayoutAttr(/*IsImplicit*/true));
new (Impl.SwiftContext) FrozenAttr(/*IsImplicit*/true));

StringRef nameForMangling;
ClangImporterSynthesizedTypeAttr::Kind relatedEntityKind;
Expand Down
2 changes: 1 addition & 1 deletion lib/IRGen/StructLayout.cpp
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Expand Up @@ -93,7 +93,7 @@ StructLayout::StructLayout(IRGenModule &IGM,

assert(typeToFill == nullptr || Ty == typeToFill);

// If the struct is not @_fixed_layout, it will have a dynamic
// If the struct is not @frozen, it will have a dynamic
// layout outside of its resilience domain.
if (decl) {
if (IGM.isResilient(decl, ResilienceExpansion::Minimal))
Expand Down
13 changes: 7 additions & 6 deletions lib/SIL/SILDeclRef.cpp
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Expand Up @@ -317,13 +317,14 @@ SILLinkage SILDeclRef::getLinkage(ForDefinition_t forDefinition) const {
if (isStoredPropertyInitializer()) {
// Three cases:
//
// 1) Type is formally @_fixed_layout. Root initializers can be declared
// @inlinable. The property initializer must only reference
// 1) Type is formally @_fixed_layout/@frozen. Root initializers can be
// declared @inlinable. The property initializer must only reference
// public symbols, and is serialized, so we give it PublicNonABI linkage.
//
// 2) Type is not formally @_fixed_layout and the module is not resilient.
// Root initializers can be declared @inlinable. This is the annoying
// case. We give the initializer public linkage if the type is public.
// 2) Type is not formally @_fixed_layout/@frozen and the module is not
// resilient. Root initializers can be declared @inlinable. This is the
// annoying case. We give the initializer public linkage if the type is
// public.
//
// 3) Type is resilient. The property initializer is never public because
// root initializers cannot be @inlinable.
Expand Down Expand Up @@ -491,7 +492,7 @@ IsSerialized_t SILDeclRef::isSerialized() const {
}

// Stored property initializers are inlinable if the type is explicitly
// marked as @_fixed_layout.
// marked as @frozen.
if (isStoredPropertyInitializer()) {
auto *nominal = cast<NominalTypeDecl>(d->getDeclContext());
auto scope =
Expand Down
7 changes: 4 additions & 3 deletions lib/Sema/TypeCheckAccess.cpp
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Expand Up @@ -1059,7 +1059,8 @@ class UsableFromInlineChecker : public AccessControlCheckerBase,
auto *parentStruct = dyn_cast<StructDecl>(PBD->getDeclContext());
if (!parentStruct)
return nullptr;
if (!parentStruct->getAttrs().hasAttribute<FixedLayoutAttr>() ||
if (!(parentStruct->getAttrs().hasAttribute<FrozenAttr>() ||
parentStruct->getAttrs().hasAttribute<FixedLayoutAttr>()) ||
PBD->isStatic() || !PBD->hasStorage()) {
return nullptr;
}
Expand Down Expand Up @@ -1091,7 +1092,7 @@ class UsableFromInlineChecker : public AccessControlCheckerBase,
auto diagID = diag::pattern_type_not_usable_from_inline_inferred;
if (fixedLayoutStructContext) {
diagID =
diag::pattern_type_not_usable_from_inline_inferred_fixed_layout;
diag::pattern_type_not_usable_from_inline_inferred_frozen;
} else if (!TC.Context.isSwiftVersionAtLeast(5)) {
diagID = diag::pattern_type_not_usable_from_inline_inferred_warn;
}
Expand Down Expand Up @@ -1127,7 +1128,7 @@ class UsableFromInlineChecker : public AccessControlCheckerBase,
DowngradeToWarning downgradeToWarning) {
auto diagID = diag::pattern_type_not_usable_from_inline;
if (fixedLayoutStructContext)
diagID = diag::pattern_type_not_usable_from_inline_fixed_layout;
diagID = diag::pattern_type_not_usable_from_inline_frozen;
else if (!TC.Context.isSwiftVersionAtLeast(5))
diagID = diag::pattern_type_not_usable_from_inline_warn;
auto diag = TC.diagnose(TP->getLoc(), diagID, anyVar->isLet(),
Expand Down
28 changes: 21 additions & 7 deletions lib/Sema/TypeCheckAttr.cpp
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Expand Up @@ -1957,6 +1957,11 @@ void AttributeChecker::visitSpecializeAttr(SpecializeAttr *attr) {
}

void AttributeChecker::visitFixedLayoutAttr(FixedLayoutAttr *attr) {
if (isa<StructDecl>(D)) {
TC.diagnose(attr->getLocation(), diag::fixed_layout_struct)
.fixItReplace(attr->getRange(), "@frozen");
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I think this needs to be getRangeWithAt (or that you should omit the @ from your replacement).

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I think I'm missing something, this looks right as-is to me:

'@frozen' attribute is now used for fixed-layout structs
@_fixed_layout
^~~~~~~~~~~~~~
@frozen

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@jrose-apple jrose-apple May 28, 2019 •
edited
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Are you sure you weren't seeing

'@frozen' attribute is now used for fixed-layout structs
@_fixed_layout
^~~~~~~~~~~~~~
 @frozen

? Which is a different thing. You can test this: expected-warning {{'@frozen' attribute is now used for fixed-layout structs}} {{1-13=@frozen}}

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A @_fixed_layout public struct FixedDeprecationWarning {} // expected-warning {{'@frozen' attribute is now used for fixed-layout structs}} {{1-15=@frozen}} test passes.

}

auto *VD = cast<ValueDecl>(D);

if (VD->getFormalAccess() < AccessLevel::Public &&
Expand Down Expand Up @@ -2462,16 +2467,25 @@ void AttributeChecker::visitImplementsAttr(ImplementsAttr *attr) {
}

void AttributeChecker::visitFrozenAttr(FrozenAttr *attr) {
auto *ED = cast<EnumDecl>(D);
if (auto *ED = dyn_cast<EnumDecl>(D)) {
if (!ED->getModuleContext()->isResilient()) {
diagnoseAndRemoveAttr(attr, diag::enum_frozen_nonresilient, attr);
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This check probably applies to structs as well.

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Still not resolved.

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Similar thing, this is the existing behavior, so I'd suggest landing and then a follow-up PR can make things more consistent across the two.

return;
}

if (!ED->getModuleContext()->isResilient()) {
diagnoseAndRemoveAttr(attr, diag::enum_frozen_nonresilient, attr);
return;
if (ED->getFormalAccess() < AccessLevel::Public &&
!ED->getAttrs().hasAttribute<UsableFromInlineAttr>()) {
diagnoseAndRemoveAttr(attr, diag::enum_frozen_nonpublic, attr);
return;
}
}

if (ED->getFormalAccess() < AccessLevel::Public &&
!ED->getAttrs().hasAttribute<UsableFromInlineAttr>()) {
diagnoseAndRemoveAttr(attr, diag::enum_frozen_nonpublic, attr);
auto *VD = cast<ValueDecl>(D);

if (VD->getFormalAccess() < AccessLevel::Public &&
!VD->getAttrs().hasAttribute<UsableFromInlineAttr>()) {
diagnoseAndRemoveAttr(attr, diag::frozen_attr_on_internal_type,
VD->getFullName(), VD->getFormalAccess());
}
}

Expand Down
2 changes: 1 addition & 1 deletion stdlib/private/StdlibUnittest/StdlibCoreExtras.swift
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Expand Up @@ -268,7 +268,7 @@ public func _isStdlibDebugConfiguration() -> Bool {
#endif
}

@_fixed_layout
@frozen
public struct LinearCongruentialGenerator: RandomNumberGenerator {

@usableFromInline
Expand Down
2 changes: 1 addition & 1 deletion stdlib/public/Darwin/ARKit/ARKit.swift
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Expand Up @@ -17,7 +17,7 @@ extension ARCamera {
/**
A value describing the camera's tracking state.
*/
@_frozen
@frozen
public enum TrackingState {
public enum Reason {
/** Tracking is limited due to initialization in progress. */
Expand Down
2 changes: 1 addition & 1 deletion stdlib/public/Darwin/CoreGraphics/CGFloat.swift.gyb
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Expand Up @@ -22,7 +22,7 @@ word_bits = int(CMAKE_SIZEOF_VOID_P) * 8
@_exported import CoreGraphics
import Darwin

@_fixed_layout
@frozen
public struct CGFloat {
#if arch(i386) || arch(arm)
/// The native type used to store the CGFloat, which is Float on
Expand Down
2 changes: 1 addition & 1 deletion stdlib/public/Darwin/Dispatch/Dispatch.swift
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Expand Up @@ -121,7 +121,7 @@ public struct DispatchQoS : Equatable {
}

///
@_frozen
@frozen
public enum DispatchTimeoutResult {
case success
case timedOut
Expand Down
10 changes: 5 additions & 5 deletions stdlib/public/Darwin/Foundation/Data.swift
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Expand Up @@ -602,7 +602,7 @@ internal class __NSSwiftData : NSData {
#endif
}

@_fixed_layout
@frozen
public struct Data : ReferenceConvertible, Equatable, Hashable, RandomAccessCollection, MutableCollection, RangeReplaceableCollection, MutableDataProtocol, ContiguousBytes {
public typealias ReferenceType = NSData

Expand All @@ -618,7 +618,7 @@ public struct Data : ReferenceConvertible, Equatable, Hashable, RandomAccessColl
// A small inline buffer of bytes suitable for stack-allocation of small data.
// Inlinability strategy: everything here should be inlined for direct operation on the stack wherever possible.
@usableFromInline
@_fixed_layout
@frozen
internal struct InlineData {
#if arch(x86_64) || arch(arm64) || arch(s390x) || arch(powerpc64) || arch(powerpc64le)
@usableFromInline typealias Buffer = (UInt8, UInt8, UInt8, UInt8, UInt8, UInt8, UInt8, UInt8,
Expand Down Expand Up @@ -839,7 +839,7 @@ public struct Data : ReferenceConvertible, Equatable, Hashable, RandomAccessColl
// A buffer of bytes too large to fit in an InlineData, but still small enough to fit a storage pointer + range in two words.
// Inlinability strategy: everything here should be easily inlinable as large _DataStorage methods should not inline into here.
@usableFromInline
@_fixed_layout
@frozen
internal struct InlineSlice {
// ***WARNING***
// These ivars are specifically laid out so that they cause the enum _Representation to be 16 bytes on 64 bit platforms. This means we _MUST_ have the class type thing last
Expand Down Expand Up @@ -1085,7 +1085,7 @@ public struct Data : ReferenceConvertible, Equatable, Hashable, RandomAccessColl
// A buffer of bytes whose range is too large to fit in a signle word. Used alongside a RangeReference to make it fit into _Representation's two-word size.
// Inlinability strategy: everything here should be easily inlinable as large _DataStorage methods should not inline into here.
@usableFromInline
@_fixed_layout
@frozen
internal struct LargeSlice {
// ***WARNING***
// These ivars are specifically laid out so that they cause the enum _Representation to be 16 bytes on 64 bit platforms. This means we _MUST_ have the class type thing last
Expand Down Expand Up @@ -1261,7 +1261,7 @@ public struct Data : ReferenceConvertible, Equatable, Hashable, RandomAccessColl
// The actual storage for Data's various representations.
// Inlinability strategy: almost everything should be inlinable as forwarding the underlying implementations. (Inlining can also help avoid retain-release traffic around pulling values out of enums.)
@usableFromInline
@_frozen
@frozen
internal enum _Representation {
case empty
case inline(InlineData)
Expand Down
6 changes: 3 additions & 3 deletions stdlib/public/Darwin/ObjectiveC/ObjectiveC.swift
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Expand Up @@ -23,7 +23,7 @@ import _SwiftObjectiveCOverlayShims
/// On 64-bit iOS, the Objective-C BOOL type is a typedef of C/C++
/// bool. Elsewhere, it is "signed char". The Clang importer imports it as
/// ObjCBool.
@_fixed_layout
@frozen
public struct ObjCBool : ExpressibleByBooleanLiteral {
#if os(macOS) || (os(iOS) && (arch(i386) || arch(arm)))
// On OS X and 32-bit iOS, Objective-C's BOOL type is a "signed char".
Expand Down Expand Up @@ -101,7 +101,7 @@ func _convertObjCBoolToBool(_ x: ObjCBool) -> Bool {
/// convert between C strings and selectors.
///
/// The compiler has special knowledge of this type.
@_fixed_layout
@frozen
public struct Selector : ExpressibleByStringLiteral {
var ptr: OpaquePointer

Expand Down Expand Up @@ -150,7 +150,7 @@ extension Selector : CustomReflectable {
// NSZone
//===----------------------------------------------------------------------===//

@_fixed_layout
@frozen
public struct NSZone {
var pointer: OpaquePointer
}
Expand Down
2 changes: 1 addition & 1 deletion stdlib/public/Platform/Platform.swift
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Expand Up @@ -28,7 +28,7 @@ public var noErr: OSStatus { return 0 }
/// Foundation.
///
/// The C type is a typedef for `unsigned char`.
@_fixed_layout
@frozen
public struct DarwinBoolean : ExpressibleByBooleanLiteral {
@usableFromInline var _value: UInt8

Expand Down
4 changes: 2 additions & 2 deletions stdlib/public/core/ASCII.swift
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Expand Up @@ -10,7 +10,7 @@
//
//===----------------------------------------------------------------------===//
extension Unicode {
@_frozen
@frozen
public enum ASCII {}
}

Expand Down Expand Up @@ -68,7 +68,7 @@ extension Unicode.ASCII : Unicode.Encoding {
return encode(FromEncoding.decode(content))
}

@_fixed_layout
@frozen
public struct Parser {
@inlinable
public init() { }
Expand Down
4 changes: 2 additions & 2 deletions stdlib/public/core/Algorithm.swift
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Expand Up @@ -91,7 +91,7 @@ public func max<T : Comparable>(_ x: T, _ y: T, _ z: T, _ rest: T...) -> T {
/// }
/// // Prints "0: foo"
/// // Prints "1: bar"
@_fixed_layout
@frozen
public struct EnumeratedSequence<Base: Sequence> {
@usableFromInline
internal var _base: Base
Expand All @@ -118,7 +118,7 @@ extension EnumeratedSequence {
///
/// To create an instance, call
/// `enumerated().makeIterator()` on a sequence or collection.
@_fixed_layout
@frozen
public struct Iterator {
@usableFromInline
internal var _base: Base.Iterator
Expand Down
2 changes: 1 addition & 1 deletion stdlib/public/core/AnyHashable.swift
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Expand Up @@ -123,7 +123,7 @@ internal struct _ConcreteHashableBox<Base : Hashable> : _AnyHashableBox {
/// print(descriptions[AnyHashable(43)]) // prints "nil"
/// print(descriptions[AnyHashable(Int8(43))]!) // prints "an Int8"
/// print(descriptions[AnyHashable(Set(["a", "b"]))]!) // prints "a set of strings"
@_fixed_layout
@frozen
public struct AnyHashable {
internal var _box: _AnyHashableBox

Expand Down
2 changes: 1 addition & 1 deletion stdlib/public/core/Array.swift
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Expand Up @@ -296,7 +296,7 @@
/// - Note: The `ContiguousArray` and `ArraySlice` types are not bridged;
/// instances of those types always have a contiguous block of memory as
/// their storage.
@_fixed_layout
@frozen
public struct Array<Element>: _DestructorSafeContainer {
#if _runtime(_ObjC)
@usableFromInline
Expand Down
2 changes: 1 addition & 1 deletion stdlib/public/core/ArrayBody.swift
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Expand Up @@ -17,7 +17,7 @@

import SwiftShims

@_fixed_layout
@frozen
@usableFromInline
internal struct _ArrayBody {
@usableFromInline
Expand Down
2 changes: 1 addition & 1 deletion stdlib/public/core/ArrayBuffer.swift
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Expand Up @@ -23,7 +23,7 @@ internal typealias _ArrayBridgeStorage
= _BridgeStorage<__ContiguousArrayStorageBase>

@usableFromInline
@_fixed_layout
@frozen
internal struct _ArrayBuffer<Element> : _ArrayBufferProtocol {

/// Create an empty buffer.
Expand Down
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