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301d9f0cf3
Constructors and methods had two parameter lists, one for self and one for the formal parameters. Destructors only had one parameter list, which introduced an annoying corner case.
824 lines
26 KiB
C++
824 lines
26 KiB
C++
//===--- SILDeclRef.cpp - Implements SILDeclRef ---------------------------===//
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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/SILDeclRef.h"
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#include "swift/SIL/SILLocation.h"
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#include "swift/AST/AnyFunctionRef.h"
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#include "swift/AST/ASTContext.h"
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#include "swift/AST/ASTMangler.h"
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#include "swift/AST/Initializer.h"
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#include "swift/AST/ParameterList.h"
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#include "swift/ClangImporter/ClangImporter.h"
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#include "swift/ClangImporter/ClangModule.h"
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#include "swift/SIL/SILLinkage.h"
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#include "llvm/Support/Compiler.h"
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#include "llvm/Support/raw_ostream.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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/// Get the method dispatch mechanism for a method.
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MethodDispatch
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swift::getMethodDispatch(AbstractFunctionDecl *method) {
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// Some methods are forced to be statically dispatched.
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if (method->hasForcedStaticDispatch())
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return MethodDispatch::Static;
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// Import-as-member declarations are always statically referenced.
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if (method->isImportAsMember())
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return MethodDispatch::Static;
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auto dc = method->getDeclContext();
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if (dc->getAsClassOrClassExtensionContext()) {
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if (method->isDynamic())
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return MethodDispatch::Class;
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// Final methods can be statically referenced.
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if (method->isFinal())
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return MethodDispatch::Static;
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// Members defined directly inside a class are dynamically dispatched.
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if (isa<ClassDecl>(dc))
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return MethodDispatch::Class;
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// Imported class methods are dynamically dispatched.
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if (method->isObjC() && method->hasClangNode())
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return MethodDispatch::Class;
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}
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// Otherwise, it can be referenced statically.
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return MethodDispatch::Static;
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}
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bool swift::requiresForeignToNativeThunk(ValueDecl *vd) {
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// Functions imported from C, Objective-C methods imported from Objective-C,
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// as well as methods in @objc protocols (even protocols defined in Swift)
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// require a foreign to native thunk.
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auto dc = vd->getDeclContext();
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if (auto proto = dyn_cast<ProtocolDecl>(dc))
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if (proto->isObjC())
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return true;
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if (auto fd = dyn_cast<FuncDecl>(vd))
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return fd->hasClangNode();
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return false;
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}
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bool swift::requiresForeignEntryPoint(ValueDecl *vd) {
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assert(!isa<AbstractStorageDecl>(vd));
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if (vd->isDynamic())
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return true;
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if (vd->isObjC() && isa<ProtocolDecl>(vd->getDeclContext()))
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return true;
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if (vd->isImportAsMember())
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return true;
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if (vd->hasClangNode())
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return true;
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if (auto *accessor = dyn_cast<AccessorDecl>(vd)) {
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// Property accessors should be generated alongside the property.
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if (accessor->isGetterOrSetter()) {
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auto *asd = accessor->getStorage();
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if (asd->isObjC() && asd->hasClangNode())
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return true;
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}
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}
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return false;
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}
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SILDeclRef::SILDeclRef(ValueDecl *vd, SILDeclRef::Kind kind,
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bool isCurried, bool isForeign)
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: loc(vd), kind(kind),
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isCurried(isCurried), isForeign(isForeign),
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isDirectReference(0), defaultArgIndex(0)
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{}
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SILDeclRef::SILDeclRef(SILDeclRef::Loc baseLoc,
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bool isCurried, bool asForeign)
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: isCurried(isCurried), isDirectReference(0), defaultArgIndex(0)
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{
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if (auto *vd = baseLoc.dyn_cast<ValueDecl*>()) {
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if (auto *fd = dyn_cast<FuncDecl>(vd)) {
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// Map FuncDecls directly to Func SILDeclRefs.
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loc = fd;
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kind = Kind::Func;
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}
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// Map ConstructorDecls to the Allocator SILDeclRef of the constructor.
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else if (auto *cd = dyn_cast<ConstructorDecl>(vd)) {
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loc = cd;
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kind = Kind::Allocator;
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}
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// Map EnumElementDecls to the EnumElement SILDeclRef of the element.
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else if (auto *ed = dyn_cast<EnumElementDecl>(vd)) {
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loc = ed;
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kind = Kind::EnumElement;
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}
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// VarDecl constants require an explicit kind.
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else if (isa<VarDecl>(vd)) {
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llvm_unreachable("must create SILDeclRef for VarDecl with explicit kind");
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}
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// Map DestructorDecls to the Deallocator of the destructor.
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else if (auto dtor = dyn_cast<DestructorDecl>(vd)) {
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loc = dtor;
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kind = Kind::Deallocator;
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}
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else {
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llvm_unreachable("invalid loc decl for SILDeclRef!");
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}
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} else if (auto *ACE = baseLoc.dyn_cast<AbstractClosureExpr *>()) {
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loc = ACE;
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kind = Kind::Func;
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assert(ACE->getParameterLists().size() >= 1 &&
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"no param patterns for function?!");
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} else {
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llvm_unreachable("impossible SILDeclRef loc");
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}
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isForeign = asForeign;
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}
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Optional<AnyFunctionRef> SILDeclRef::getAnyFunctionRef() const {
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if (auto vd = loc.dyn_cast<ValueDecl*>()) {
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if (auto afd = dyn_cast<AbstractFunctionDecl>(vd)) {
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return AnyFunctionRef(afd);
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} else {
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return None;
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}
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}
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return AnyFunctionRef(loc.get<AbstractClosureExpr*>());
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}
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bool SILDeclRef::isThunk() const {
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return isCurried || isForeignToNativeThunk() || isNativeToForeignThunk();
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}
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bool SILDeclRef::isClangImported() const {
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if (!hasDecl())
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return false;
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ValueDecl *d = getDecl();
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DeclContext *moduleContext = d->getDeclContext()->getModuleScopeContext();
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if (isa<ClangModuleUnit>(moduleContext)) {
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if (isClangGenerated())
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return true;
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if (isa<ConstructorDecl>(d) || isa<EnumElementDecl>(d))
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return !isForeign;
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if (auto *FD = dyn_cast<FuncDecl>(d))
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if (isa<AccessorDecl>(FD) ||
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isa<NominalTypeDecl>(d->getDeclContext()))
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return !isForeign;
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}
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return false;
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}
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bool SILDeclRef::isClangGenerated() const {
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if (!hasDecl())
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return false;
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return isClangGenerated(getDecl()->getClangNode());
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}
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// FIXME: this is a weird predicate.
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bool SILDeclRef::isClangGenerated(ClangNode node) {
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if (auto nd = dyn_cast_or_null<clang::NamedDecl>(node.getAsDecl())) {
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// ie, 'static inline' functions for which we must ask Clang to emit a body
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// for explicitly
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if (!nd->isExternallyVisible())
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return true;
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}
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return false;
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}
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bool SILDeclRef::isImplicit() const {
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if (hasDecl())
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return getDecl()->isImplicit();
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return getAbstractClosureExpr()->isImplicit();
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}
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SILLinkage SILDeclRef::getLinkage(ForDefinition_t forDefinition) const {
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if (getAbstractClosureExpr()) {
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return isSerialized() ? SILLinkage::Shared : SILLinkage::Private;
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}
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// Add External to the linkage (e.g. Public -> PublicExternal) if this is a
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// declaration not a definition.
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auto maybeAddExternal = [&](SILLinkage linkage) {
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return forDefinition ? linkage : addExternalToLinkage(linkage);
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};
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// Native function-local declarations have shared linkage.
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// FIXME: @objc declarations should be too, but we currently have no way
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// of marking them "used" other than making them external.
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ValueDecl *d = getDecl();
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DeclContext *moduleContext = d->getDeclContext();
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while (!moduleContext->isModuleScopeContext()) {
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if (!isForeign && moduleContext->isLocalContext()) {
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return isSerialized() ? SILLinkage::Shared : SILLinkage::Private;
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}
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moduleContext = moduleContext->getParent();
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}
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// Enum constructors and curry thunks either have private or shared
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// linkage, dependings are essentially the same as thunks, they are
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// emitted by need and have shared linkage.
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if (isEnumElement() || isCurried) {
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switch (d->getEffectiveAccess()) {
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case AccessLevel::Private:
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case AccessLevel::FilePrivate:
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return maybeAddExternal(SILLinkage::Private);
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case AccessLevel::Internal:
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case AccessLevel::Public:
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case AccessLevel::Open:
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return SILLinkage::Shared;
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}
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}
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// Calling convention thunks have shared linkage.
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if (isForeignToNativeThunk())
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return SILLinkage::Shared;
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// If a function declares a @_cdecl name, its native-to-foreign thunk
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// is exported with the visibility of the function.
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if (isNativeToForeignThunk() && !d->getAttrs().hasAttribute<CDeclAttr>())
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return SILLinkage::Shared;
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// Declarations imported from Clang modules have shared linkage.
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if (isClangImported())
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return SILLinkage::Shared;
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// Default argument generators of Public functions have PublicNonABI linkage
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// if the function was type-checked in Swift 4 mode.
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if (kind == SILDeclRef::Kind::DefaultArgGenerator) {
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if (isSerialized())
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return maybeAddExternal(SILLinkage::PublicNonABI);
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}
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bool neverPublic = false;
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// ivar initializers and destroyers are completely contained within the class
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// from which they come, and never get seen externally.
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if (isIVarInitializerOrDestroyer()) {
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neverPublic = true;
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}
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// Stored property initializers get the linkage of their containing type.
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if (isStoredPropertyInitializer()) {
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// Three cases:
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//
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// 1) Type is formally @_fixed_layout. Root initializers can be declared
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// @inlinable. The property initializer must only reference
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// public symbols, and is serialized, so we give it PublicNonABI linkage.
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//
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// 2) Type is not formally @_fixed_layout and the module is not resilient.
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// Root initializers can be declared @inlinable. This is the annoying
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// case. We give the initializer public linkage if the type is public.
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//
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// 3) Type is resilient. The property initializer is never public because
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// root initializers cannot be @inlinable.
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//
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// FIXME: Get rid of case 2 somehow.
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if (isSerialized())
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return maybeAddExternal(SILLinkage::PublicNonABI);
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d = cast<NominalTypeDecl>(d->getDeclContext());
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// FIXME: This should always be true.
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if (d->getDeclContext()->getParentModule()->getResilienceStrategy() ==
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ResilienceStrategy::Resilient)
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neverPublic = true;
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}
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// The global addressor is never public for resilient globals.
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if (kind == Kind::GlobalAccessor) {
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if (cast<VarDecl>(d)->isResilient()) {
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neverPublic = true;
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}
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}
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switch (d->getEffectiveAccess()) {
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case AccessLevel::Private:
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case AccessLevel::FilePrivate:
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return maybeAddExternal(SILLinkage::Private);
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case AccessLevel::Internal:
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return maybeAddExternal(SILLinkage::Hidden);
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case AccessLevel::Public:
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case AccessLevel::Open:
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if (neverPublic)
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return maybeAddExternal(SILLinkage::Hidden);
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return maybeAddExternal(SILLinkage::Public);
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}
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}
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SILDeclRef SILDeclRef::getDefaultArgGenerator(Loc loc,
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unsigned defaultArgIndex) {
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SILDeclRef result;
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result.loc = loc;
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result.kind = Kind::DefaultArgGenerator;
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result.defaultArgIndex = defaultArgIndex;
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return result;
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}
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bool SILDeclRef::hasClosureExpr() const {
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return loc.is<AbstractClosureExpr *>()
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&& isa<ClosureExpr>(getAbstractClosureExpr());
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}
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bool SILDeclRef::hasAutoClosureExpr() const {
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return loc.is<AbstractClosureExpr *>()
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&& isa<AutoClosureExpr>(getAbstractClosureExpr());
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}
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bool SILDeclRef::hasFuncDecl() const {
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return loc.is<ValueDecl *>() && isa<FuncDecl>(getDecl());
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}
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ClosureExpr *SILDeclRef::getClosureExpr() const {
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return dyn_cast<ClosureExpr>(getAbstractClosureExpr());
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}
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AutoClosureExpr *SILDeclRef::getAutoClosureExpr() const {
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return dyn_cast<AutoClosureExpr>(getAbstractClosureExpr());
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}
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FuncDecl *SILDeclRef::getFuncDecl() const {
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return dyn_cast<FuncDecl>(getDecl());
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}
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bool SILDeclRef::isSetter() const {
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if (!hasDecl())
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return false;
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if (auto accessor = dyn_cast<AccessorDecl>(getDecl()))
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return accessor->isSetter();
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return false;
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}
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AbstractFunctionDecl *SILDeclRef::getAbstractFunctionDecl() const {
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return dyn_cast<AbstractFunctionDecl>(getDecl());
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}
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/// \brief True if the function should be treated as transparent.
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bool SILDeclRef::isTransparent() const {
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if (isEnumElement())
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return true;
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if (isStoredPropertyInitializer())
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return true;
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if (hasAutoClosureExpr())
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return true;
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if (hasDecl()) {
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if (auto *AFD = dyn_cast<AbstractFunctionDecl>(getDecl()))
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return AFD->isTransparent();
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if (auto *ASD = dyn_cast<AbstractStorageDecl>(getDecl()))
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return ASD->isTransparent();
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}
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return false;
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}
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/// \brief True if the function should have its body serialized.
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IsSerialized_t SILDeclRef::isSerialized() const {
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DeclContext *dc;
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if (auto closure = getAbstractClosureExpr())
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dc = closure->getLocalContext();
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else {
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auto *d = getDecl();
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// Default argument generators are serialized if the function was
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// type-checked in Swift 4 mode.
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if (kind == SILDeclRef::Kind::DefaultArgGenerator) {
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auto *afd = cast<AbstractFunctionDecl>(d);
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switch (afd->getDefaultArgumentResilienceExpansion()) {
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case ResilienceExpansion::Minimal:
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return IsSerialized;
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case ResilienceExpansion::Maximal:
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return IsNotSerialized;
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}
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}
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dc = getDecl()->getInnermostDeclContext();
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// Enum element constructors are serialized if the enum is
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// @usableFromInline or public.
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if (isEnumElement())
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if (d->getEffectiveAccess() >= AccessLevel::Public)
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return IsSerialized;
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// Currying thunks are serialized if referenced from an inlinable
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// context -- Sema's semantic checks ensure the serialization of
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// such a thunk is valid, since it must in turn reference a public
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// symbol, or dispatch via class_method or witness_method.
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if (isCurried)
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if (d->getEffectiveAccess() >= AccessLevel::Public)
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return IsSerializable;
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if (isForeignToNativeThunk())
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return IsSerializable;
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// The allocating entry point for designated initializers are serialized
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// if the class is @usableFromInline or public.
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if (kind == SILDeclRef::Kind::Allocator) {
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auto *ctor = cast<ConstructorDecl>(d);
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if (ctor->isDesignatedInit() &&
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ctor->getDeclContext()->getAsClassOrClassExtensionContext()) {
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if (ctor->getEffectiveAccess() >= AccessLevel::Public &&
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!ctor->hasClangNode())
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return IsSerialized;
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}
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}
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// Stored property initializers are inlinable if the type is explicitly
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// marked as @_fixed_layout.
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if (isStoredPropertyInitializer()) {
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auto *nominal = cast<NominalTypeDecl>(d->getDeclContext());
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auto scope =
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nominal->getFormalAccessScope(/*useDC=*/nullptr,
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/*treatUsableFromInlineAsPublic=*/true);
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if (!scope.isPublic())
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return IsNotSerialized;
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if (nominal->isFormallyResilient())
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return IsNotSerialized;
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return IsSerialized;
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}
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}
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// Declarations imported from Clang modules are serialized if
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// referenced from an inlinable context.
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if (isClangImported())
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return IsSerializable;
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// Otherwise, ask the AST if we're inside an @inlinable context.
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if (dc->getResilienceExpansion() == ResilienceExpansion::Minimal)
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return IsSerialized;
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return IsNotSerialized;
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}
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/// \brief True if the function has noinline attribute.
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bool SILDeclRef::isNoinline() const {
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if (!hasDecl())
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return false;
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if (auto InlineA = getDecl()->getAttrs().getAttribute<InlineAttr>())
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if (InlineA->getKind() == InlineKind::Never)
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return true;
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return false;
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}
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/// \brief True if the function has noinline attribute.
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bool SILDeclRef::isAlwaysInline() const {
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if (!hasDecl())
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return false;
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if (auto InlineA = getDecl()->getAttrs().getAttribute<InlineAttr>())
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if (InlineA->getKind() == InlineKind::Always)
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return true;
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return false;
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}
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bool SILDeclRef::hasEffectsAttribute() const {
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if (!hasDecl())
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return false;
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return getDecl()->getAttrs().hasAttribute<EffectsAttr>();
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}
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EffectsKind SILDeclRef::getEffectsAttribute() const {
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assert(hasEffectsAttribute());
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EffectsAttr *MA = getDecl()->getAttrs().getAttribute<EffectsAttr>();
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return MA->getKind();
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}
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bool SILDeclRef::isForeignToNativeThunk() const {
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// Non-decl entry points are never natively foreign, so they would never
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// have a foreign-to-native thunk.
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if (!hasDecl())
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return false;
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if (requiresForeignToNativeThunk(getDecl()))
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return !isForeign;
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// ObjC initializing constructors and factories are foreign.
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// We emit a special native allocating constructor though.
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|
if (isa<ConstructorDecl>(getDecl())
|
|
&& (kind == Kind::Initializer
|
|
|| cast<ConstructorDecl>(getDecl())->isFactoryInit())
|
|
&& getDecl()->hasClangNode())
|
|
return !isForeign;
|
|
return false;
|
|
}
|
|
|
|
bool SILDeclRef::isNativeToForeignThunk() const {
|
|
// We can have native-to-foreign thunks over closures.
|
|
if (!hasDecl())
|
|
return isForeign;
|
|
// We can have native-to-foreign thunks over global or local native functions.
|
|
// TODO: Static functions too.
|
|
if (auto func = dyn_cast<FuncDecl>(getDecl())) {
|
|
if (!func->getDeclContext()->isTypeContext()
|
|
&& !func->hasClangNode())
|
|
return isForeign;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
/// Use the Clang importer to mangle a Clang declaration.
|
|
static void mangleClangDecl(raw_ostream &buffer,
|
|
const clang::NamedDecl *clangDecl,
|
|
ASTContext &ctx) {
|
|
auto *importer = static_cast<ClangImporter *>(ctx.getClangModuleLoader());
|
|
importer->getMangledName(buffer, clangDecl);
|
|
}
|
|
|
|
std::string SILDeclRef::mangle(ManglingKind MKind) const {
|
|
using namespace Mangle;
|
|
ASTMangler mangler;
|
|
|
|
// As a special case, Clang functions and globals don't get mangled at all.
|
|
if (hasDecl()) {
|
|
if (auto clangDecl = getDecl()->getClangDecl()) {
|
|
if (!isForeignToNativeThunk() && !isNativeToForeignThunk()
|
|
&& !isCurried) {
|
|
if (auto namedClangDecl = dyn_cast<clang::DeclaratorDecl>(clangDecl)) {
|
|
if (auto asmLabel = namedClangDecl->getAttr<clang::AsmLabelAttr>()) {
|
|
std::string s(1, '\01');
|
|
s += asmLabel->getLabel();
|
|
return s;
|
|
} else if (namedClangDecl->hasAttr<clang::OverloadableAttr>()) {
|
|
std::string storage;
|
|
llvm::raw_string_ostream SS(storage);
|
|
// FIXME: When we can import C++, use Clang's mangler all the time.
|
|
mangleClangDecl(SS, namedClangDecl, getDecl()->getASTContext());
|
|
return SS.str();
|
|
}
|
|
return namedClangDecl->getName();
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
ASTMangler::SymbolKind SKind = ASTMangler::SymbolKind::Default;
|
|
switch (MKind) {
|
|
case SILDeclRef::ManglingKind::Default:
|
|
if (isForeign) {
|
|
SKind = ASTMangler::SymbolKind::SwiftAsObjCThunk;
|
|
} else if (isDirectReference) {
|
|
SKind = ASTMangler::SymbolKind::DirectMethodReferenceThunk;
|
|
} else if (isForeignToNativeThunk()) {
|
|
SKind = ASTMangler::SymbolKind::ObjCAsSwiftThunk;
|
|
}
|
|
break;
|
|
case SILDeclRef::ManglingKind::DynamicThunk:
|
|
SKind = ASTMangler::SymbolKind::DynamicThunk;
|
|
break;
|
|
}
|
|
|
|
switch (kind) {
|
|
case SILDeclRef::Kind::Func:
|
|
if (!hasDecl())
|
|
return mangler.mangleClosureEntity(getAbstractClosureExpr(), SKind);
|
|
|
|
// As a special case, functions can have manually mangled names.
|
|
// Use the SILGen name only for the original non-thunked, non-curried entry
|
|
// point.
|
|
if (auto NameA = getDecl()->getAttrs().getAttribute<SILGenNameAttr>())
|
|
if (!NameA->Name.empty() &&
|
|
!isForeignToNativeThunk() && !isNativeToForeignThunk()
|
|
&& !isCurried) {
|
|
return NameA->Name;
|
|
}
|
|
|
|
// Use a given cdecl name for native-to-foreign thunks.
|
|
if (auto CDeclA = getDecl()->getAttrs().getAttribute<CDeclAttr>())
|
|
if (isNativeToForeignThunk()) {
|
|
return CDeclA->Name;
|
|
}
|
|
|
|
// Otherwise, fall through into the 'other decl' case.
|
|
LLVM_FALLTHROUGH;
|
|
|
|
case SILDeclRef::Kind::EnumElement:
|
|
return mangler.mangleEntity(getDecl(), isCurried, SKind);
|
|
|
|
case SILDeclRef::Kind::Deallocator:
|
|
assert(!isCurried);
|
|
return mangler.mangleDestructorEntity(cast<DestructorDecl>(getDecl()),
|
|
/*isDeallocating*/ true,
|
|
SKind);
|
|
|
|
case SILDeclRef::Kind::Destroyer:
|
|
assert(!isCurried);
|
|
return mangler.mangleDestructorEntity(cast<DestructorDecl>(getDecl()),
|
|
/*isDeallocating*/ false,
|
|
SKind);
|
|
|
|
case SILDeclRef::Kind::Allocator:
|
|
return mangler.mangleConstructorEntity(cast<ConstructorDecl>(getDecl()),
|
|
/*allocating*/ true,
|
|
isCurried,
|
|
SKind);
|
|
|
|
case SILDeclRef::Kind::Initializer:
|
|
return mangler.mangleConstructorEntity(cast<ConstructorDecl>(getDecl()),
|
|
/*allocating*/ false,
|
|
isCurried,
|
|
SKind);
|
|
|
|
case SILDeclRef::Kind::IVarInitializer:
|
|
case SILDeclRef::Kind::IVarDestroyer:
|
|
assert(!isCurried);
|
|
return mangler.mangleIVarInitDestroyEntity(cast<ClassDecl>(getDecl()),
|
|
kind == SILDeclRef::Kind::IVarDestroyer,
|
|
SKind);
|
|
|
|
case SILDeclRef::Kind::GlobalAccessor:
|
|
assert(!isCurried);
|
|
return mangler.mangleAccessorEntity(AccessorKind::MutableAddress,
|
|
AddressorKind::Unsafe,
|
|
cast<AbstractStorageDecl>(getDecl()),
|
|
/*isStatic*/ false,
|
|
SKind);
|
|
|
|
case SILDeclRef::Kind::DefaultArgGenerator:
|
|
assert(!isCurried);
|
|
return mangler.mangleDefaultArgumentEntity(
|
|
cast<AbstractFunctionDecl>(getDecl()),
|
|
defaultArgIndex,
|
|
SKind);
|
|
|
|
case SILDeclRef::Kind::StoredPropertyInitializer:
|
|
assert(!isCurried);
|
|
return mangler.mangleInitializerEntity(cast<VarDecl>(getDecl()), SKind);
|
|
}
|
|
|
|
llvm_unreachable("bad entity kind!");
|
|
}
|
|
|
|
bool SILDeclRef::requiresNewVTableEntry() const {
|
|
if (cast<AbstractFunctionDecl>(getDecl())->needsNewVTableEntry())
|
|
return true;
|
|
if (kind == SILDeclRef::Kind::Allocator) {
|
|
auto *cd = cast<ConstructorDecl>(getDecl());
|
|
if (cd->isRequired()) {
|
|
auto *baseCD = cd->getOverriddenDecl();
|
|
if(!baseCD ||
|
|
!baseCD->isRequired() ||
|
|
baseCD->hasClangNode())
|
|
return true;
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
SILDeclRef SILDeclRef::getOverridden() const {
|
|
if (!hasDecl())
|
|
return SILDeclRef();
|
|
auto overridden = getDecl()->getOverriddenDecl();
|
|
if (!overridden)
|
|
return SILDeclRef();
|
|
|
|
return SILDeclRef(overridden, kind, isCurried);
|
|
}
|
|
|
|
SILDeclRef SILDeclRef::getNextOverriddenVTableEntry() const {
|
|
if (auto overridden = getOverridden()) {
|
|
// If we overrode a foreign decl, a dynamic method, this is an
|
|
// accessor for a property that overrides an ObjC decl, or if it is an
|
|
// @NSManaged property, then it won't be in the vtable.
|
|
if (overridden.getDecl()->hasClangNode())
|
|
return SILDeclRef();
|
|
|
|
// If we overrode a non-required initializer, there won't be a vtable
|
|
// slot for the allocator.
|
|
if (overridden.kind == SILDeclRef::Kind::Allocator) {
|
|
if (!cast<ConstructorDecl>(overridden.getDecl())->isRequired())
|
|
return SILDeclRef();
|
|
} else if (overridden.getDecl()->isDynamic()) {
|
|
return SILDeclRef();
|
|
}
|
|
|
|
if (auto *accessor = dyn_cast<AccessorDecl>(overridden.getDecl())) {
|
|
auto *asd = accessor->getStorage();
|
|
if (asd->hasClangNode())
|
|
return SILDeclRef();
|
|
if (asd->isDynamic())
|
|
return SILDeclRef();
|
|
}
|
|
|
|
// If we overrode a decl from an extension, it won't be in a vtable
|
|
// either. This can occur for extensions to ObjC classes.
|
|
if (isa<ExtensionDecl>(overridden.getDecl()->getDeclContext()))
|
|
return SILDeclRef();
|
|
|
|
return overridden;
|
|
}
|
|
return SILDeclRef();
|
|
}
|
|
|
|
SILDeclRef SILDeclRef::getOverriddenVTableEntry() const {
|
|
SILDeclRef cur = *this, next = *this;
|
|
do {
|
|
cur = next;
|
|
if (cur.requiresNewVTableEntry())
|
|
return cur;
|
|
next = cur.getNextOverriddenVTableEntry();
|
|
} while (next);
|
|
|
|
return cur;
|
|
}
|
|
|
|
SILLocation SILDeclRef::getAsRegularLocation() const {
|
|
if (hasDecl())
|
|
return RegularLocation(getDecl());
|
|
return RegularLocation(getAbstractClosureExpr());
|
|
}
|
|
|
|
SubclassScope SILDeclRef::getSubclassScope() const {
|
|
if (!hasDecl())
|
|
return SubclassScope::NotApplicable;
|
|
|
|
// If this declaration is a function which goes into a vtable, then it's
|
|
// symbol must be as visible as its class. Derived classes even have to put
|
|
// all less visible methods of the base class into their vtables.
|
|
|
|
auto *FD = dyn_cast<AbstractFunctionDecl>(getDecl());
|
|
if (!FD)
|
|
return SubclassScope::NotApplicable;
|
|
|
|
DeclContext *context = FD->getDeclContext();
|
|
|
|
// Methods from extensions don't go into vtables (yet).
|
|
if (context->isExtensionContext())
|
|
return SubclassScope::NotApplicable;
|
|
|
|
// Various forms of thunks don't either.
|
|
if (isThunk() || isForeign)
|
|
return SubclassScope::NotApplicable;
|
|
|
|
// Default arg generators only need to be visible in Swift 3.
|
|
if (isDefaultArgGenerator() && !context->getASTContext().isSwiftVersion3())
|
|
return SubclassScope::NotApplicable;
|
|
|
|
auto *classType = context->getAsClassOrClassExtensionContext();
|
|
if (!classType || classType->isFinal())
|
|
return SubclassScope::NotApplicable;
|
|
|
|
if (FD->isFinal())
|
|
return SubclassScope::NotApplicable;
|
|
|
|
assert(FD->getEffectiveAccess() <= classType->getEffectiveAccess() &&
|
|
"class must be as visible as its members");
|
|
|
|
switch (classType->getEffectiveAccess()) {
|
|
case AccessLevel::Private:
|
|
case AccessLevel::FilePrivate:
|
|
return SubclassScope::NotApplicable;
|
|
case AccessLevel::Internal:
|
|
case AccessLevel::Public:
|
|
return SubclassScope::Internal;
|
|
case AccessLevel::Open:
|
|
return SubclassScope::External;
|
|
}
|
|
|
|
llvm_unreachable("Unhandled access level in switch.");
|
|
}
|
|
|
|
unsigned SILDeclRef::getParameterListCount() const {
|
|
if (isCurried || !hasDecl() || kind == Kind::DefaultArgGenerator)
|
|
return 1;
|
|
|
|
auto *vd = getDecl();
|
|
|
|
if (auto *func = dyn_cast<AbstractFunctionDecl>(vd)) {
|
|
return func->getParameterLists().size();
|
|
} else if (auto *ed = dyn_cast<EnumElementDecl>(vd)) {
|
|
return ed->hasAssociatedValues() ? 2 : 1;
|
|
} else if (isa<ClassDecl>(vd)) {
|
|
return 2;
|
|
} else if (isa<VarDecl>(vd)) {
|
|
return 1;
|
|
} else {
|
|
llvm_unreachable("Unhandled ValueDecl for SILDeclRef");
|
|
}
|
|
}
|