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103 lines
3.6 KiB
C++
103 lines
3.6 KiB
C++
//===--- Attr.cpp - Swift Language Attr ASTs ------------------------------===//
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//
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// This source file is part of the Swift.org open source project
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//
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// Copyright (c) 2014 - 2015 Apple Inc. and the Swift project authors
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// Licensed under Apache License v2.0 with Runtime Library Exception
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//
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// See http://swift.org/LICENSE.txt for license information
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// See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements routines relating to declaration attributes.
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//
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//===----------------------------------------------------------------------===//
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#include "swift/AST/Attr.h"
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#include "swift/AST/ASTContext.h"
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#include "swift/AST/Component.h"
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#include "swift/AST/Decl.h"
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#include "swift/AST/Module.h"
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#include "swift/AST/Types.h"
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using namespace swift;
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/// A statically-allocated empty set of attributes.
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const DeclAttributes Decl::EmptyAttrs;
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DeclAttributes &Decl::getMutableAttrs() {
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// If we don't have mutable attribute storage yet, allocate some.
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if (&getAttrs() == &EmptyAttrs)
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AttrsAndIsObjC = {getASTContext().Allocate<DeclAttributes>(1),
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AttrsAndIsObjC.getInt()};
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return *const_cast<DeclAttributes*>(&getAttrs());
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}
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/// getResilienceFrom - Find the resilience of this declaration from
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/// the given component.
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Resilience ValueDecl::getResilienceFrom(Component *C) const {
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const Resilience invalidResilience = Resilience(-1);
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Resilience explicitResilience = invalidResilience;
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DeclContext *DC = getDeclContext();
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while (true) {
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ValueDecl *D = nullptr;
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switch (DC->getContextKind()) {
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case DeclContextKind::Module:
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switch (cast<Module>(DC)->getKind()) {
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case ModuleKind::Builtin:
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// All the builtin declarations are inherently fragile.
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return Resilience::InherentlyFragile;
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case ModuleKind::Clang:
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// Anything from a Clang module is inherently fragile.
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return Resilience::InherentlyFragile;
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// Global declarations are resilient according to whether the module
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// is resilient in this translation unit.
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case ModuleKind::TranslationUnit:
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case ModuleKind::Serialized:
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if (explicitResilience != invalidResilience)
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return explicitResilience;
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return C->isResilient(cast<Module>(DC))
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? Resilience::Resilient : Resilience::Fragile;
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case ModuleKind::FailedImport:
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llvm_unreachable("can't get resilience for failed import");
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}
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assert(0 && "All cases should be covered");
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// Local declarations are always inherently fragile.
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case DeclContextKind::AbstractClosureExpr:
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case DeclContextKind::TopLevelCodeDecl:
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case DeclContextKind::AbstractFunctionDecl:
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return Resilience::InherentlyFragile;
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// For enums, we walk out through the enum decl.
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case DeclContextKind::NominalTypeDecl:
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if (isa<ProtocolDecl>(DC)) {
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// FIXME: no attrs here, either.
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return Resilience::Fragile;
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}
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assert(isa<StructDecl>(DC) || isa<EnumDecl>(DC) || isa<ClassDecl>(DC) &&
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"Unexpected decl");
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D = cast<NominalTypeDecl>(DC);
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goto HandleDecl;
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case DeclContextKind::ExtensionDecl:
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// FIXME: we can't use the ExtensionDecl, it has no attrs.
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return Resilience::Fragile;
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}
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llvm_unreachable("bad decl context kind!");
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HandleDecl:
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if (explicitResilience == invalidResilience) {
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ResilienceData resil = D->getAttrs().getResilienceData();
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if (resil.isValid())
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explicitResilience = resil.getResilience();
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}
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DC = D->getDeclContext();
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}
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}
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