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//===--- SILDefaultOverrideTable.cpp --------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2025 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 defines the SILDefaultOverrideTable class, which is used to
// provide default override implementations of class routines which have been
// come to implement the same semantic class member that was previously
// implemented by a different routine. As with SILDefaultWitnessTable, this
// type enables IRGen to generate metadata which in turn allows the runtime to
// instantiate vtables which contain these default overrides when they are
// needed: in the vtables of subclasses which were emitted prior to the
// replacement of the routine that implements the semantic member AND which
// already provided an override of the routine that previously implemented the
// semantic member.
//
//===----------------------------------------------------------------------===//
#include "swift/SIL/SILDefaultOverrideTable.h"
#include "swift/AST/ASTMangler.h"
#include "swift/SIL/SILFunction.h"
#include "swift/SIL/SILModule.h"
using namespace swift;
SILDefaultOverrideTable::SILDefaultOverrideTable(SILModule &M,
SILLinkage Linkage,
const ClassDecl *decl)
: module(M), linkage(Linkage), decl(decl), entries({}),
state(State::Declared) {}
SILDefaultOverrideTable *
SILDefaultOverrideTable::declare(SILModule &module, SILLinkage linkage,
const ClassDecl *decl) {
auto *buffer = module.allocate<SILDefaultOverrideTable>(1);
SILDefaultOverrideTable *table =
::new (buffer) SILDefaultOverrideTable(module, linkage, decl);
table->registerWithModule();
return table;
}
SILDefaultOverrideTable *SILDefaultOverrideTable::define(
SILModule &module, SILLinkage linkage, const ClassDecl *decl,
ArrayRef<SILDefaultOverrideTable::Entry> entries) {
auto *buffer = module.allocate<SILDefaultOverrideTable>(1);
SILDefaultOverrideTable *table =
::new (buffer) SILDefaultOverrideTable(module, linkage, decl);
table->define(entries);
table->registerWithModule();
// Return the resulting default witness table.
return table;
}
void SILDefaultOverrideTable::registerWithModule() {
assert(module.DefaultOverrideTableMap.find(decl) ==
module.DefaultOverrideTableMap.end());
module.DefaultOverrideTableMap[decl] = this;
module.defaultOverrideTables.push_back(this);
}
std::string SILDefaultOverrideTable::getUniqueName() const {
Mangle::ASTMangler Mangler(decl->getASTContext());
return Mangler.mangleTypeWithoutPrefix(
decl->getDeclaredInterfaceType()->getCanonicalType());
}
void SILDefaultOverrideTable::define(ArrayRef<Entry> entries) {
assert(state == State::Declared);
state = State::Defined;
this->entries = module.allocateCopy(entries);
// Retain referenced functions.
for (auto entry : getEntries()) {
entry.impl->incrementRefCount();
}
}
SILDefaultOverrideTable::~SILDefaultOverrideTable() {
// Release referenced functions.
for (auto entry : getEntries()) {
entry.impl->decrementRefCount();
}
}
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