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//===--- ConcreteDeclRef.cpp - Reference to a concrete decl ---------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2017 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
//
// This file implements the ConcreteDeclRef class, which provides a reference to
// a declaration that is potentially specialized.
//
//===----------------------------------------------------------------------===//
#include "swift/AST/ASTContext.h"
#include "swift/AST/ConcreteDeclRef.h"
#include "swift/AST/Decl.h"
#include "swift/AST/GenericSignature.h"
#include "swift/AST/ProtocolConformance.h"
#include "swift/AST/SubstitutionMap.h"
#include "swift/AST/Types.h"
#include "llvm/Support/raw_ostream.h"
using namespace swift;
ConcreteDeclRef ConcreteDeclRef::getOverriddenDecl() const {
auto *derivedDecl = getDecl();
auto *baseDecl = derivedDecl->getOverriddenDecl();
auto baseSig = baseDecl->getInnermostDeclContext()
->getGenericSignatureOfContext();
auto derivedSig = derivedDecl->getInnermostDeclContext()
->getGenericSignatureOfContext();
SubstitutionMap subs;
if (baseSig) {
subs = SubstitutionMap::getOverrideSubstitutions(baseDecl, derivedDecl);
if (derivedSig)
subs = subs.subst(getSubstitutions());
}
return ConcreteDeclRef(baseDecl, subs);
}
ConcreteDeclRef ConcreteDeclRef::getOverriddenDecl(ValueDecl *baseDecl) const {
auto *derivedDecl = getDecl();
if (baseDecl == derivedDecl) return *this;
#ifndef NDEBUG
{
auto cur = derivedDecl;
for (; cur && cur != baseDecl; cur = cur->getOverriddenDecl()) {}
assert(cur && "decl is not an indirect override of baseDecl");
}
#endif
if (!baseDecl->getInnermostDeclContext()->isGenericContext()) {
return ConcreteDeclRef(baseDecl);
}
auto subs = SubstitutionMap::getOverrideSubstitutions(baseDecl, derivedDecl);
if (auto derivedSubs = getSubstitutions()) {
subs = subs.subst(derivedSubs);
}
return ConcreteDeclRef(baseDecl, subs);
}
void ConcreteDeclRef::dump(raw_ostream &os) const {
if (!getDecl()) {
os << "**NULL**";
return;
}
getDecl()->dumpRef(os);
// If specialized, dump the substitutions.
if (isSpecialized()) {
os << " [with ";
getSubstitutions().dump(os, SubstitutionMap::DumpStyle::Minimal);
os << ']';
}
}
void ConcreteDeclRef::dump() const {
dump(llvm::errs());
}
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