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