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013aad13d4
There's an immediate need for this in the core libs, and we have most of the necessary pieces on hand to make it easy to implement. This is an unpolished initial implementation, with the following limitations, among others:
- It doesn't support bridging error conventions,
- It relies on ObjC interop,
- It doesn't check for symbol name collisions,
- It has an underscored name with required symbol name `@cdecl("symbol_name")`, awaiting official bikeshed painting.
654 lines
23 KiB
C++
654 lines
23 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 - 2016 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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#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/Mangle.h"
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#include "swift/Basic/Fallthrough.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/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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// Final methods can be statically referenced.
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if (method->isFinal())
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return MethodDispatch::Static;
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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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// If this declaration is in a class but not marked final, then it is
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// always dynamically dispatched.
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auto dc = method->getDeclContext();
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if (isa<ClassDecl>(dc))
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return MethodDispatch::Class;
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// Class extension methods are only dynamically dispatched if they're
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// dispatched by objc_msgSend, which happens if they're foreign or dynamic.
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if (dc->getAsClassOrClassExtensionContext()) {
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if (method->hasClangNode())
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return MethodDispatch::Class;
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if (auto fd = dyn_cast<FuncDecl>(method)) {
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if (fd->isAccessor() && fd->getAccessorStorageDecl()->hasClangNode())
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return MethodDispatch::Class;
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}
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if (method->getAttrs().hasAttribute<DynamicAttr>())
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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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/// FIXME: merge requiresObjCDispatch() into getMethodDispatch() and add
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/// an ObjectiveC case to the MethodDispatch enum.
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bool swift::requiresObjCDispatch(ValueDecl *vd) {
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// Final functions never require ObjC dispatch.
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if (vd->isFinal())
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return false;
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if (requiresForeignToNativeThunk(vd))
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return true;
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if (auto *fd = dyn_cast<FuncDecl>(vd)) {
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// Property accessors should be generated alongside the property.
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if (fd->isGetterOrSetter())
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return requiresObjCDispatch(fd->getAccessorStorageDecl());
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return fd->getAttrs().hasAttribute<DynamicAttr>();
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}
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if (auto *cd = dyn_cast<ConstructorDecl>(vd)) {
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if (cd->hasClangNode())
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return true;
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return cd->getAttrs().hasAttribute<DynamicAttr>();
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}
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if (auto *asd = dyn_cast<AbstractStorageDecl>(vd))
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return asd->requiresObjCGetterAndSetter();
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return vd->getAttrs().hasAttribute<DynamicAttr>();
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}
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static unsigned getFuncNaturalUncurryLevel(AnyFunctionRef AFR) {
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assert(AFR.getParameterLists().size() >= 1 && "no arguments for func?!");
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unsigned Level = AFR.getParameterLists().size() - 1;
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// Functions with captures have an extra uncurry level for the capture
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// context.
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if (AFR.getCaptureInfo().hasLocalCaptures())
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Level += 1;
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return Level;
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}
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SILDeclRef::SILDeclRef(ValueDecl *vd, SILDeclRef::Kind kind,
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ResilienceExpansion expansion,
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unsigned atUncurryLevel, bool isForeign)
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: loc(vd), kind(kind), Expansion(unsigned(expansion)),
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isForeign(isForeign), isDirectReference(0), defaultArgIndex(0)
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{
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unsigned naturalUncurryLevel;
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// FIXME: restructure to use a "switch".
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if (auto *func = dyn_cast<FuncDecl>(vd)) {
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assert(kind == Kind::Func &&
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"can only create a Func SILDeclRef for a func decl");
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naturalUncurryLevel = getFuncNaturalUncurryLevel(func);
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} else if (isa<ConstructorDecl>(vd)) {
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assert((kind == Kind::Allocator || kind == Kind::Initializer)
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&& "can only create Allocator or Initializer SILDeclRef for ctor");
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naturalUncurryLevel = 1;
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} else if (auto *ed = dyn_cast<EnumElementDecl>(vd)) {
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assert(kind == Kind::EnumElement
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&& "can only create EnumElement SILDeclRef for enum element");
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naturalUncurryLevel = ed->hasArgumentType() ? 1 : 0;
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} else if (isa<DestructorDecl>(vd)) {
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assert((kind == Kind::Destroyer || kind == Kind::Deallocator)
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&& "can only create destroyer/deallocator SILDeclRef for dtor");
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naturalUncurryLevel = 0;
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} else if (isa<ClassDecl>(vd)) {
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assert((kind == Kind::IVarInitializer || kind == Kind::IVarDestroyer) &&
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"can only create ivar initializer/destroyer SILDeclRef for class");
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naturalUncurryLevel = 1;
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} else if (auto *var = dyn_cast<VarDecl>(vd)) {
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assert((kind == Kind::GlobalAccessor || kind == Kind::GlobalGetter) &&
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"can only create GlobalAccessor or GlobalGetter SILDeclRef for var");
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naturalUncurryLevel = 0;
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assert(!var->getDeclContext()->isLocalContext() &&
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"can't reference local var as global var");
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assert(var->hasStorage() && "can't reference computed var as global var");
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(void)var;
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} else {
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llvm_unreachable("Unhandled ValueDecl for SILDeclRef");
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}
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assert((atUncurryLevel == ConstructAtNaturalUncurryLevel
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|| atUncurryLevel <= naturalUncurryLevel)
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&& "can't emit SILDeclRef below natural uncurry level");
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uncurryLevel = atUncurryLevel == ConstructAtNaturalUncurryLevel
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? naturalUncurryLevel
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: atUncurryLevel;
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isCurried = uncurryLevel != naturalUncurryLevel;
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}
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SILDeclRef::SILDeclRef(SILDeclRef::Loc baseLoc,
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ResilienceExpansion expansion,
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unsigned atUncurryLevel, bool asForeign)
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: isDirectReference(0), defaultArgIndex(0)
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{
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unsigned naturalUncurryLevel;
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if (ValueDecl *vd = baseLoc.dyn_cast<ValueDecl*>()) {
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if (FuncDecl *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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naturalUncurryLevel = getFuncNaturalUncurryLevel(fd);
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}
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// Map ConstructorDecls to the Allocator SILDeclRef of the constructor.
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else if (ConstructorDecl *cd = dyn_cast<ConstructorDecl>(vd)) {
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loc = cd;
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kind = Kind::Allocator;
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naturalUncurryLevel = 1;
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// FIXME: Should we require the caller to think about this?
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asForeign = false;
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}
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// Map EnumElementDecls to the EnumElement SILDeclRef of the element.
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else if (EnumElementDecl *ed = dyn_cast<EnumElementDecl>(vd)) {
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loc = ed;
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kind = Kind::EnumElement;
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naturalUncurryLevel = ed->hasArgumentType() ? 1 : 0;
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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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naturalUncurryLevel = 0;
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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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naturalUncurryLevel = getFuncNaturalUncurryLevel(ACE);
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} else {
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llvm_unreachable("impossible SILDeclRef loc");
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}
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// Set the uncurry level.
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assert((atUncurryLevel == ConstructAtNaturalUncurryLevel
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|| atUncurryLevel <= naturalUncurryLevel)
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&& "can't emit SILDeclRef below natural uncurry level");
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uncurryLevel = atUncurryLevel == ConstructAtNaturalUncurryLevel
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? naturalUncurryLevel
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: atUncurryLevel;
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Expansion = (unsigned) expansion;
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isCurried = uncurryLevel != naturalUncurryLevel;
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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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static SILLinkage getLinkageForLocalContext(DeclContext *dc) {
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auto isClangImported = [](AbstractFunctionDecl *fn) -> bool {
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if (fn->hasClangNode())
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return true;
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if (auto func = dyn_cast<FuncDecl>(fn))
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if (auto storage = func->getAccessorStorageDecl())
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return storage->hasClangNode();
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return false;
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};
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while (!dc->isModuleScopeContext()) {
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// Local definitions in transparent contexts are forced public because
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// external references to them can be exposed by mandatory inlining.
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// For Clang-imported decls, though, the closure should get re-synthesized
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// on use.
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if (auto fn = dyn_cast<AbstractFunctionDecl>(dc))
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if (fn->isTransparent() && !isClangImported(fn))
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return SILLinkage::Public;
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// Check that this local context is not itself in a local transparent
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// context.
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dc = dc->getParent();
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}
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// FIXME: Once we have access control at the AST level, we should not assume
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// shared always, but rather base it off of the local decl context.
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return SILLinkage::Shared;
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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 true;
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if (auto *FD = dyn_cast<FuncDecl>(d))
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if (FD->isAccessor() ||
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isa<NominalTypeDecl>(d->getDeclContext()))
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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::isClangGenerated() const {
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if (!hasDecl())
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return false;
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auto clangNode = getDecl()->getClangNode().getAsDecl();
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if (auto nd = dyn_cast_or_null<clang::NamedDecl>(clangNode)) {
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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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SILLinkage SILDeclRef::getLinkage(ForDefinition_t forDefinition) const {
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// Anonymous functions have local linkage.
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if (auto closure = getAbstractClosureExpr())
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return getLinkageForLocalContext(closure->getParent());
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// Native function-local declarations have local 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 getLinkageForLocalContext(moduleContext);
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moduleContext = moduleContext->getParent();
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}
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// Currying and calling convention thunks have shared linkage.
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if (isThunk())
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// If a function declares a @_cdecl name, its native-to-foreign thunk is
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// 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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// Enum constructors are essentially the same as thunks, they are
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// emitted by need and have shared linkage.
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if (kind == Kind::EnumElement)
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return SILLinkage::Shared;
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// Declarations imported from Clang modules have shared linkage.
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// FIXME: They shouldn't.
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const SILLinkage ClangLinkage = SILLinkage::Shared;
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if (isClangImported())
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return ClangLinkage;
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// Declarations that were derived on behalf of types in Clang modules get
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// shared linkage.
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if (auto *FD = dyn_cast<FuncDecl>(d)) {
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if (auto derivedFor = FD->getDerivedForTypeDecl())
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if (isa<ClangModuleUnit>(derivedFor->getModuleScopeContext()))
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return ClangLinkage;
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}
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// Otherwise, we have external linkage.
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switch (d->getEffectiveAccess()) {
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case Accessibility::Private:
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return (forDefinition ? SILLinkage::Private : SILLinkage::PrivateExternal);
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case Accessibility::Internal:
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return (forDefinition ? SILLinkage::Hidden : SILLinkage::HiddenExternal);
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default:
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return (forDefinition ? SILLinkage::Public : SILLinkage::PublicExternal);
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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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/// \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 (hasAutoClosureExpr())
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return true;
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return hasDecl() ? getDecl()->isTransparent() : false;
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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())
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&& (kind == Kind::Initializer
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|| cast<ConstructorDecl>(getDecl())->isFactoryInit())
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&& getDecl()->hasClangNode())
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return !isForeign;
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return false;
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}
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bool SILDeclRef::isNativeToForeignThunk() const {
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// We can have native-to-foreign thunks over closures.
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if (!hasDecl())
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return isForeign;
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// We can have native-to-foreign thunks over global or local native functions.
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// TODO: Static functions too.
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if (auto func = dyn_cast<FuncDecl>(getDecl())) {
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if (!func->getDeclContext()->isTypeContext()
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&& !func->hasClangNode())
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return isForeign;
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}
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return false;
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}
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/// Use the Clang importer to mangle a Clang declaration.
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static void mangleClangDecl(raw_ostream &buffer,
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const clang::NamedDecl *clangDecl,
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ASTContext &ctx) {
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auto *importer = static_cast<ClangImporter *>(ctx.getClangModuleLoader());
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importer->getMangledName(buffer, clangDecl);
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}
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static std::string mangleConstant(SILDeclRef c, StringRef prefix) {
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using namespace Mangle;
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Mangler mangler;
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// Almost everything below gets one of the common prefixes:
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// mangled-name ::= '_T' global // Native symbol
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// mangled-name ::= '_TTo' global // ObjC interop thunk
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// mangled-name ::= '_TTO' global // Foreign function thunk
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// mangled-name ::= '_TTd' global // Direct
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StringRef introducer = "_T";
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if (!prefix.empty()) {
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introducer = prefix;
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} else if (c.isForeign) {
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assert(prefix.empty() && "can't have custom prefix on thunk");
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introducer = "_TTo";
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} else if (c.isDirectReference) {
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introducer = "_TTd";
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} else if (c.isForeignToNativeThunk()) {
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assert(prefix.empty() && "can't have custom prefix on thunk");
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introducer = "_TTO";
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}
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switch (c.kind) {
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// entity ::= declaration // other declaration
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case SILDeclRef::Kind::Func:
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if (!c.hasDecl()) {
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mangler.append(introducer);
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mangler.mangleClosureEntity(c.getAbstractClosureExpr(),
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c.uncurryLevel);
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return mangler.finalize();
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}
|
|
|
|
// 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 = c.getDecl()->getAttrs().getAttribute<SILGenNameAttr>())
|
|
if (!c.isForeignToNativeThunk() && !c.isNativeToForeignThunk()
|
|
&& !c.isCurried) {
|
|
mangler.append(NameA->Name);
|
|
return mangler.finalize();
|
|
}
|
|
|
|
// Use a given cdecl name for native-to-foreign thunks.
|
|
if (auto CDeclA = c.getDecl()->getAttrs().getAttribute<CDeclAttr>())
|
|
if (c.isNativeToForeignThunk()) {
|
|
mangler.append(CDeclA->Name);
|
|
return mangler.finalize();
|
|
}
|
|
|
|
// Otherwise, fall through into the 'other decl' case.
|
|
SWIFT_FALLTHROUGH;
|
|
|
|
case SILDeclRef::Kind::EnumElement:
|
|
// As a special case, Clang functions and globals don't get mangled at all.
|
|
if (auto clangDecl = c.getDecl()->getClangDecl()) {
|
|
if (!c.isForeignToNativeThunk() && !c.isNativeToForeignThunk()
|
|
&& !c.isCurried) {
|
|
if (auto namedClangDecl = dyn_cast<clang::DeclaratorDecl>(clangDecl)) {
|
|
if (auto asmLabel = namedClangDecl->getAttr<clang::AsmLabelAttr>()) {
|
|
mangler.append('\01');
|
|
mangler.append(asmLabel->getLabel());
|
|
} 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,
|
|
c.getDecl()->getASTContext());
|
|
mangler.append(SS.str());
|
|
} else {
|
|
mangler.append(namedClangDecl->getName());
|
|
}
|
|
return mangler.finalize();
|
|
}
|
|
}
|
|
}
|
|
|
|
mangler.append(introducer);
|
|
mangler.mangleEntity(c.getDecl(), c.uncurryLevel);
|
|
return mangler.finalize();
|
|
|
|
// entity ::= context 'D' // deallocating destructor
|
|
case SILDeclRef::Kind::Deallocator:
|
|
mangler.append(introducer);
|
|
mangler.mangleDestructorEntity(cast<DestructorDecl>(c.getDecl()),
|
|
/*isDeallocating*/ true);
|
|
return mangler.finalize();
|
|
|
|
// entity ::= context 'd' // destroying destructor
|
|
case SILDeclRef::Kind::Destroyer:
|
|
mangler.append(introducer);
|
|
mangler.mangleDestructorEntity(cast<DestructorDecl>(c.getDecl()),
|
|
/*isDeallocating*/ false);
|
|
return mangler.finalize();
|
|
|
|
// entity ::= context 'C' type // allocating constructor
|
|
case SILDeclRef::Kind::Allocator:
|
|
mangler.append(introducer);
|
|
mangler.mangleConstructorEntity(cast<ConstructorDecl>(c.getDecl()),
|
|
/*allocating*/ true,
|
|
c.uncurryLevel);
|
|
return mangler.finalize();
|
|
|
|
// entity ::= context 'c' type // initializing constructor
|
|
case SILDeclRef::Kind::Initializer:
|
|
mangler.append(introducer);
|
|
mangler.mangleConstructorEntity(cast<ConstructorDecl>(c.getDecl()),
|
|
/*allocating*/ false,
|
|
c.uncurryLevel);
|
|
return mangler.finalize();
|
|
|
|
// entity ::= declaration 'e' // ivar initializer
|
|
// entity ::= declaration 'E' // ivar destroyer
|
|
case SILDeclRef::Kind::IVarInitializer:
|
|
case SILDeclRef::Kind::IVarDestroyer:
|
|
mangler.append(introducer);
|
|
mangler.mangleIVarInitDestroyEntity(
|
|
cast<ClassDecl>(c.getDecl()),
|
|
c.kind == SILDeclRef::Kind::IVarDestroyer);
|
|
return mangler.finalize();
|
|
|
|
// entity ::= declaration 'a' // addressor
|
|
case SILDeclRef::Kind::GlobalAccessor:
|
|
mangler.append(introducer);
|
|
mangler.mangleAddressorEntity(c.getDecl());
|
|
return mangler.finalize();
|
|
|
|
// entity ::= declaration 'G' // getter
|
|
case SILDeclRef::Kind::GlobalGetter:
|
|
mangler.append(introducer);
|
|
mangler.mangleGlobalGetterEntity(c.getDecl());
|
|
return mangler.finalize();
|
|
|
|
// entity ::= context 'e' index // default arg generator
|
|
case SILDeclRef::Kind::DefaultArgGenerator:
|
|
mangler.append(introducer);
|
|
mangler.mangleDefaultArgumentEntity(cast<AbstractFunctionDecl>(c.getDecl()),
|
|
c.defaultArgIndex);
|
|
return mangler.finalize();
|
|
}
|
|
|
|
llvm_unreachable("bad entity kind!");
|
|
}
|
|
|
|
std::string SILDeclRef::mangle(StringRef prefix) const {
|
|
return mangleConstant(*this, prefix);
|
|
}
|
|
|
|
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 (overridden.getDecl()->getAttrs().hasAttribute<DynamicAttr>())
|
|
return SILDeclRef();
|
|
if (auto *ovFD = dyn_cast<FuncDecl>(overridden.getDecl()))
|
|
if (auto *asd = ovFD->getAccessorStorageDecl()) {
|
|
if (asd->hasClangNode())
|
|
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();
|
|
|
|
// If we overrode a non-required initializer, there won't be a vtable
|
|
// slot for the allocator.
|
|
if (overridden.kind == SILDeclRef::Kind::Allocator &&
|
|
!cast<ConstructorDecl>(overridden.getDecl())->isRequired()) {
|
|
return SILDeclRef();
|
|
}
|
|
|
|
return overridden;
|
|
}
|
|
return SILDeclRef();
|
|
}
|
|
|
|
SILDeclRef SILDeclRef::getBaseOverriddenVTableEntry() const {
|
|
// 'method' is the most final method in the hierarchy which we
|
|
// haven't yet found a compatible override for. 'cur' is the method
|
|
// we're currently looking at. Compatibility is transitive,
|
|
// so we can forget our original method and just keep going up.
|
|
SILDeclRef method = *this;
|
|
SILDeclRef cur = method;
|
|
while ((cur = cur.getNextOverriddenVTableEntry())) {
|
|
method = cur;
|
|
}
|
|
return method;
|
|
}
|
|
|
|
SILLocation SILDeclRef::getAsRegularLocation() const {
|
|
if (hasDecl())
|
|
return RegularLocation(getDecl());
|
|
return RegularLocation(getAbstractClosureExpr());
|
|
}
|