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112 lines
4.1 KiB
C++
112 lines
4.1 KiB
C++
//===--- SILDefaultWitnessTable.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 - 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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//
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// This file defines the SILDefaultWitnessTable class, which is used to provide
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// default implementations of protocol requirements for resilient protocols,
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// allowing IRGen to generate the appropriate metadata so that the runtime can
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// insert those requirements to witness tables that were emitted prior to the
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// requirement being added.
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//
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//===----------------------------------------------------------------------===//
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#include "swift/SIL/SILDefaultWitnessTable.h"
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#include "swift/SIL/SILModule.h"
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#include "llvm/ADT/SmallString.h"
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using namespace swift;
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void SILDefaultWitnessTable::addDefaultWitnessTable() {
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// Make sure we have not seen this witness table yet.
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assert(Mod.DefaultWitnessTableMap.find(Protocol) ==
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Mod.DefaultWitnessTableMap.end() && "Attempting to create duplicate "
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"default witness table.");
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Mod.DefaultWitnessTableMap[Protocol] = this;
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Mod.defaultWitnessTables.push_back(this);
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}
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SILDefaultWitnessTable *
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SILDefaultWitnessTable::create(SILModule &M, const ProtocolDecl *Protocol,
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unsigned MinimumWitnessTableSizeInWords,
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ArrayRef<SILDefaultWitnessTable::Entry> entries){
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// Allocate the witness table and initialize it.
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void *buf = M.allocate(sizeof(SILDefaultWitnessTable),
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alignof(SILDefaultWitnessTable));
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SILDefaultWitnessTable *wt =
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::new (buf) SILDefaultWitnessTable(M, Protocol,
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MinimumWitnessTableSizeInWords,
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entries);
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wt->addDefaultWitnessTable();
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// Return the resulting default witness table.
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return wt;
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}
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SILDefaultWitnessTable *
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SILDefaultWitnessTable::create(SILModule &M, const ProtocolDecl *Protocol) {
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// Allocate the witness table and initialize it.
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void *buf = M.allocate(sizeof(SILDefaultWitnessTable),
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alignof(SILDefaultWitnessTable));
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SILDefaultWitnessTable *wt =
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::new (buf) SILDefaultWitnessTable(M, Protocol);
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wt->addDefaultWitnessTable();
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// Return the resulting default witness table.
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return wt;
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}
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SILDefaultWitnessTable::
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SILDefaultWitnessTable(SILModule &M,
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const ProtocolDecl *Protocol,
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unsigned MinimumWitnessTableSizeInWords,
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ArrayRef<Entry> entries)
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: Mod(M), Protocol(Protocol), MinimumWitnessTableSizeInWords(0), Entries(),
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IsDeclaration(true) {
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convertToDefinition(MinimumWitnessTableSizeInWords, entries);
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}
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SILDefaultWitnessTable::SILDefaultWitnessTable(SILModule &M,
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const ProtocolDecl *Protocol)
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: Mod(M), Protocol(Protocol), MinimumWitnessTableSizeInWords(0), Entries(),
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IsDeclaration(true) {}
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void SILDefaultWitnessTable::
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convertToDefinition(unsigned MinimumWitnessTableSizeInWords,
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ArrayRef<Entry> entries) {
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assert(IsDeclaration);
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IsDeclaration = false;
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this->MinimumWitnessTableSizeInWords = MinimumWitnessTableSizeInWords;
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void *buf = Mod.allocate(sizeof(Entry)*entries.size(), alignof(Entry));
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memcpy(buf, entries.begin(), sizeof(Entry)*entries.size());
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Entries = MutableArrayRef<Entry>(static_cast<Entry*>(buf), entries.size());
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// Bump the reference count of witness functions referenced by this table.
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for (auto entry : getEntries()) {
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if (entry.isValid()) {
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entry.getWitness()->incrementRefCount();
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}
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}
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}
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SILDefaultWitnessTable::~SILDefaultWitnessTable() {
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// Drop the reference count of witness functions referenced by this table.
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for (auto entry : getEntries()) {
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if (entry.isValid()) {
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entry.getWitness()->decrementRefCount();
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}
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}
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}
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