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1c651973c3
"Accessibility" has a different meaning for app developers, so we've already deliberately excised it from our diagnostics in favor of terms like "access control" and "access level". Do the same in the compiler now that we aren't constantly pulling things into the release branch. This commit changes the 'Accessibility' enum to be named 'AccessLevel'.
144 lines
4.8 KiB
C++
144 lines
4.8 KiB
C++
//===--- SIL.cpp - Implements random SIL functionality --------------------===//
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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 - 2017 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 https://swift.org/LICENSE.txt for license information
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// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//===----------------------------------------------------------------------===//
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#include "swift/SIL/FormalLinkage.h"
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#include "swift/SIL/SILModule.h"
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#include "swift/SIL/SILBuilder.h"
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#include "swift/SIL/SILDeclRef.h"
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#include "swift/SIL/SILType.h"
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#include "swift/SIL/SILUndef.h"
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#include "swift/AST/ASTContext.h"
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#include "swift/AST/AnyFunctionRef.h"
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#include "swift/AST/Decl.h"
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#include "swift/AST/Pattern.h"
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#include "swift/AST/ProtocolConformance.h"
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#include "swift/ClangImporter/ClangModule.h"
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#include "clang/AST/Attr.h"
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#include "clang/AST/Decl.h"
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#include "clang/AST/DeclObjC.h"
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using namespace swift;
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SILUndef *SILUndef::get(SILType Ty, SILModule *M) {
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// Unique these.
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SILUndef *&Entry = M->UndefValues[Ty];
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if (Entry == nullptr)
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Entry = new (*M) SILUndef(Ty);
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return Entry;
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}
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FormalLinkage swift::getDeclLinkage(const ValueDecl *D) {
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const DeclContext *fileContext = D->getDeclContext()->getModuleScopeContext();
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// Clang declarations are public and can't be assured of having a
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// unique defining location.
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if (isa<ClangModuleUnit>(fileContext))
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return FormalLinkage::PublicNonUnique;
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if (!D->hasAccess()) {
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assert(D->getDeclContext()->isLocalContext());
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return FormalLinkage::Private;
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}
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switch (D->getEffectiveAccess()) {
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case AccessLevel::Public:
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case AccessLevel::Open:
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return FormalLinkage::PublicUnique;
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case AccessLevel::Internal:
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// If we're serializing all function bodies, type metadata for internal
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// types needs to be public too.
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if (D->getDeclContext()->getParentModule()->getResilienceStrategy()
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== ResilienceStrategy::Fragile)
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return FormalLinkage::PublicUnique;
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return FormalLinkage::HiddenUnique;
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case AccessLevel::FilePrivate:
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case AccessLevel::Private:
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// Why "hidden" instead of "private"? Because the debugger may need to
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// access these symbols.
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return FormalLinkage::HiddenUnique;
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}
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llvm_unreachable("Unhandled Accessibility in switch.");
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}
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FormalLinkage swift::getTypeLinkage(CanType type) {
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FormalLinkage result = FormalLinkage::Top;
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// Merge all nominal types from the structural type.
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(void) type.findIf([&](Type _type) {
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CanType type = CanType(_type);
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// For any nominal type reference, look at the type declaration.
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if (auto nominal = type->getAnyNominal())
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result ^= getDeclLinkage(nominal);
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return false; // continue searching
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});
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return result;
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}
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SILLinkage swift::getSILLinkage(FormalLinkage linkage,
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ForDefinition_t forDefinition) {
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switch (linkage) {
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case FormalLinkage::PublicUnique:
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return (forDefinition ? SILLinkage::Public : SILLinkage::PublicExternal);
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case FormalLinkage::PublicNonUnique:
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// FIXME: any place we have to do this that actually requires
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// uniqueness is buggy.
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return (forDefinition ? SILLinkage::Shared : SILLinkage::PublicExternal);
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case FormalLinkage::HiddenUnique:
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return (forDefinition ? SILLinkage::Hidden : SILLinkage::HiddenExternal);
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case FormalLinkage::HiddenNonUnique:
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return (forDefinition ? SILLinkage::Shared : SILLinkage::HiddenExternal);
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case FormalLinkage::Private:
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return SILLinkage::Private;
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}
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llvm_unreachable("bad formal linkage");
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}
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SILLinkage
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swift::getLinkageForProtocolConformance(const NormalProtocolConformance *C,
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ForDefinition_t definition) {
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// Behavior conformances are always private.
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if (C->isBehaviorConformance())
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return (definition ? SILLinkage::Private : SILLinkage::PrivateExternal);
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ModuleDecl *conformanceModule = C->getDeclContext()->getParentModule();
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// If the conformance was synthesized by the ClangImporter, give it
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// shared linkage.
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auto typeDecl = C->getType()->getNominalOrBoundGenericNominal();
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auto typeUnit = typeDecl->getModuleScopeContext();
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if (isa<ClangModuleUnit>(typeUnit)
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&& conformanceModule == typeUnit->getParentModule())
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return SILLinkage::Shared;
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AccessLevel access = std::min(C->getProtocol()->getEffectiveAccess(),
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typeDecl->getEffectiveAccess());
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switch (access) {
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case AccessLevel::Private:
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case AccessLevel::FilePrivate:
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return (definition ? SILLinkage::Private : SILLinkage::PrivateExternal);
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case AccessLevel::Internal:
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return (definition ? SILLinkage::Hidden : SILLinkage::HiddenExternal);
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default:
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return (definition ? SILLinkage::Public : SILLinkage::PublicExternal);
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}
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}
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