Add @_inlineable attribute

include/swift/AST/Attr.def

@@ -152,7 +152,7 @@ SIMPLE_DECL_ATTR(prefix , Prefix , OnFunc | OnOperator | DeclModifier, 24)
 SIMPLE_DECL_ATTR(postfix, Postfix, OnFunc | OnOperator | DeclModifier, 25)
 
 SIMPLE_DECL_ATTR(_transparent, Transparent,
-                 OnFunc|OnConstructor|OnVar|OnExtension|UserInaccessible, 26)
+                 OnFunc|OnConstructor|OnVar|UserInaccessible, 26)
 SIMPLE_DECL_ATTR(requires_stored_property_inits, RequiresStoredPropertyInits,
                  OnClass, 27)
 DECL_ATTR(autoclosure, AutoClosure, OnParam, 28)
@@ -164,9 +164,13 @@ SIMPLE_DECL_ATTR(nonobjc, NonObjC,
 SIMPLE_DECL_ATTR(_fixed_layout, FixedLayout,
                  OnVar | OnClass | OnStruct | OnEnum | UserInaccessible, 31)
 
+SIMPLE_DECL_ATTR(_inlineable, Inlineable,
+                 OnVar | OnSubscript | OnFunc | OnConstructor | OnDestructor |
+                 UserInaccessible, 32)
+
 DECL_ATTR(_specialize, Specialize,
           OnConstructor | OnFunc | AllowMultipleAttributes | LongAttribute
-          | UserInaccessible, 32)
+          | UserInaccessible, 33)
 
 // Non-serialized attributes.
 

include/swift/AST/Decl.h

@@ -733,10 +733,6 @@ class alignas(1 << DeclAlignInBits) Decl {
 
   bool walk(ASTWalker &walker);
 
-  /// \brief Should this declaration be treated as if annotated with transparent
-  /// attribute.
-  bool isTransparent() const;
-
   /// \brief Return whether this declaration has been determined invalid.
   bool isInvalid() const { return DeclBits.Invalid; }
 
@@ -3784,6 +3780,10 @@ class AbstractStorageDecl : public ValueDecl {
   }
 public:
 
+  /// \brief Should this declaration be treated as if annotated with transparent
+  /// attribute.
+  bool isTransparent() const;
+
   /// \brief Determine whether this storage is a static member, if it
   /// is a member.  Currently only variables can be static.
   inline bool isStatic() const; // defined in this header
@@ -4595,8 +4595,13 @@ class AbstractFunctionDecl : public ValueDecl, public DeclContext {
   }
 
   void setGenericParams(GenericParamList *GenericParams);
-  
+
 public:
+
+  /// \brief Should this declaration be treated as if annotated with transparent
+  /// attribute.
+  bool isTransparent() const;
+
   void setGenericSignature(GenericSignature *GenericSig) {
     assert(!this->GenericSig && "already have signature?");
     this->GenericSig = GenericSig;

include/swift/AST/DiagnosticsSema.def

@@ -930,8 +930,6 @@ ERROR(static_functions_not_mutating,none,
 
 ERROR(transparent_stored_property,none,
       "@_transparent cannot be applied to stored properties", ())
-ERROR(transparent_on_invalid_extension,none,
-      "@_transparent is only supported on struct and enum extensions", ())
 ERROR(transparent_in_protocols_not_supported,none,
       "@_transparent is not supported on declarations within protocols", ())
 ERROR(transparent_in_classes_not_supported,none,

include/swift/Serialization/ModuleFormat.h

@@ -54,7 +54,7 @@ const uint16_t VERSION_MAJOR = 0;
 /// in source control, you should also update the comment to briefly
 /// describe what change you made. The content of this comment isn't important;
 /// it just ensures a conflict if two people change the module format.
-const uint16_t VERSION_MINOR = 281; // Last change: complete witnesses
+const uint16_t VERSION_MINOR = 282; // Last change: @_inlineable
 
 using DeclID = PointerEmbeddedInt<unsigned, 31>;
 using DeclIDField = BCFixed<31>;

lib/AST/Decl.cpp

@@ -348,19 +348,15 @@ case DeclKind::ID: return cast<ID##Decl>(this)->getLoc();
   llvm_unreachable("Unknown decl kind");
 }
 
-bool Decl::isTransparent() const {
+bool AbstractStorageDecl::isTransparent() const {
+  return getAttrs().hasAttribute<TransparentAttr>();
+}
+
+bool AbstractFunctionDecl::isTransparent() const {
   // Check if the declaration had the attribute.
   if (getAttrs().hasAttribute<TransparentAttr>())
     return true;
 
-  // Check if this is a function declaration which is within a transparent
-  // extension.
-  if (const AbstractFunctionDecl *FD = dyn_cast<AbstractFunctionDecl>(this)) {
-    if (const ExtensionDecl *ED = dyn_cast<ExtensionDecl>(FD->getParent()))
-      if (ED->isTransparent())
-        return true;
-  }
-
   // If this is an accessor, check if the transparent attribute was set
   // on the value decl.
   if (const FuncDecl *FD = dyn_cast<FuncDecl>(this)) {

lib/AST/DeclContext.cpp

@@ -503,21 +503,31 @@ bool DeclContext::isValidGenericContext() const {
 /// are used.
 ResilienceExpansion DeclContext::getResilienceExpansion() const {
   for (const auto *dc = this; dc->isLocalContext(); dc = dc->getParent()) {
-    if (auto *func = dyn_cast<AbstractFunctionDecl>(dc)) {
+    if (auto *AFD = dyn_cast<AbstractFunctionDecl>(dc)) {
       // If the function is not externally visible, we will not be serializing
       // its body.
-      if (!func->getDeclContext()->isLocalContext() &&
-          func->getEffectiveAccess() < Accessibility::Public)
+      if (!AFD->getDeclContext()->isLocalContext() &&
+          AFD->getEffectiveAccess() < Accessibility::Public)
         break;
 
       // Bodies of public transparent and always-inline functions are
       // serialized, so use conservative access patterns.
-      if (func->isTransparent())
+      if (AFD->isTransparent())
         return ResilienceExpansion::Minimal;
 
-      if (auto attr = func->getAttrs().getAttribute<InlineAttr>())
+      if (AFD->getAttrs().hasAttribute<InlineableAttr>())
+        return ResilienceExpansion::Minimal;
+
+      if (auto attr = AFD->getAttrs().getAttribute<InlineAttr>())
         if (attr->getKind() == InlineKind::Always)
           return ResilienceExpansion::Minimal;
+
+      // If a property or subscript is @_fragile, the accessors are
+      // @_fragile also.
+      if (auto FD = dyn_cast<FuncDecl>(AFD))
+        if (auto *ASD = FD->getAccessorStorageDecl())
+          if (ASD->getAttrs().getAttribute<InlineableAttr>())
+            return ResilienceExpansion::Minimal;
     }
   }
 

lib/SIL/SILDeclRef.cpp

@@ -482,7 +482,15 @@ bool SILDeclRef::isTransparent() const {
   if (hasAutoClosureExpr())
     return true;
 
-  return hasDecl() ? getDecl()->isTransparent() : false;
+  if (hasDecl()) {
+    if (auto *AFD = dyn_cast<AbstractFunctionDecl>(getDecl()))
+      return AFD->isTransparent();
+
+    if (auto *ASD = dyn_cast<AbstractStorageDecl>(getDecl()))
+      return ASD->isTransparent();
+  }
+
+  return false;
 }
 
 /// \brief True if the function should have its body serialized.

lib/Sema/TypeCheckAttr.cpp

@@ -57,6 +57,7 @@ class AttributeEarlyChecker : public AttributeVisitor<AttributeEarlyChecker> {
   IGNORED_ATTR(FixedLayout)
   IGNORED_ATTR(Infix)
   IGNORED_ATTR(Inline)
+  IGNORED_ATTR(Inlineable)
   IGNORED_ATTR(NSApplicationMain)
   IGNORED_ATTR(NSCopying)
   IGNORED_ATTR(NonObjC)
@@ -219,15 +220,6 @@ class AttributeEarlyChecker : public AttributeVisitor<AttributeEarlyChecker> {
 } // end anonymous namespace
 
 void AttributeEarlyChecker::visitTransparentAttr(TransparentAttr *attr) {
-  if (auto *ED = dyn_cast<ExtensionDecl>(D)) {
-    CanType ExtendedTy = ED->getExtendedType()->getCanonicalType();
-    const NominalTypeDecl *ExtendedNominal = ExtendedTy->getAnyNominal();
-    // Only Struct and Enum extensions can be transparent.
-    if (!isa<StructDecl>(ExtendedNominal) && !isa<EnumDecl>(ExtendedNominal))
-      return diagnoseAndRemoveAttr(attr,diag::transparent_on_invalid_extension);
-    return;
-  }
-
   DeclContext *Ctx = D->getDeclContext();
   // Protocol declarations cannot be transparent.
   if (isa<ProtocolDecl>(Ctx))
@@ -697,18 +689,18 @@ class AttributeChecker : public AttributeVisitor<AttributeChecker> {
 
     IGNORED_ATTR(AutoClosure)
     IGNORED_ATTR(Alignment)
-    IGNORED_ATTR(SILGenName)
+    IGNORED_ATTR(Convenience)
     IGNORED_ATTR(Dynamic)
+    IGNORED_ATTR(Effects)
     IGNORED_ATTR(Exported)
-    IGNORED_ATTR(Convenience)
+    IGNORED_ATTR(FixedLayout)
     IGNORED_ATTR(GKInspectable)
     IGNORED_ATTR(IBDesignable)
     IGNORED_ATTR(IBInspectable)
     IGNORED_ATTR(IBOutlet) // checked early.
     IGNORED_ATTR(Indirect)
     IGNORED_ATTR(Inline)
-    IGNORED_ATTR(Effects)
-    IGNORED_ATTR(FixedLayout)
+    IGNORED_ATTR(Inlineable)
     IGNORED_ATTR(Lazy)      // checked early.
     IGNORED_ATTR(LLDBDebuggerFunction)
     IGNORED_ATTR(Mutating)
@@ -725,6 +717,7 @@ class AttributeChecker : public AttributeVisitor<AttributeChecker> {
     IGNORED_ATTR(Override)
     IGNORED_ATTR(RawDocComment)
     IGNORED_ATTR(Semantics)
+    IGNORED_ATTR(SILGenName)
     IGNORED_ATTR(Transparent)
     IGNORED_ATTR(SynthesizedProtocol)
     IGNORED_ATTR(RequiresStoredPropertyInits)

lib/Sema/TypeCheckDecl.cpp

@@ -5864,6 +5864,7 @@ class DeclChecker : public DeclVisitor<DeclChecker> {
     UNINTERESTING_ATTR(IBOutlet)
     UNINTERESTING_ATTR(Indirect)
     UNINTERESTING_ATTR(Inline)
+    UNINTERESTING_ATTR(Inlineable)
     UNINTERESTING_ATTR(Effects)
     UNINTERESTING_ATTR(FixedLayout)
     UNINTERESTING_ATTR(Lazy)