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//===--- Metadata.cpp -----------------------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2020 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
//
//===----------------------------------------------------------------------===//
//
// Backward deployment of swift_allocateMetadataPack() and
// swift_allocateWitnessTablePack() runtime entry points.
//
//===----------------------------------------------------------------------===//
#include "../../public/runtime/MetadataCache.h"
using namespace swift;
/// Copy and paste a symbol that needs to exist.
void *MetadataAllocator::Allocate(size_t size, size_t alignment) {
return malloc(size);
}
/// Avoid depending on non-inline parts of llvm::hashing.
inline llvm::hash_code our_hash_integer_value(uint64_t value) {
const char *s = reinterpret_cast<const char *>(&value);
const uint64_t a = llvm::hashing::detail::fetch32(s);
return llvm::hashing::detail::hash_16_bytes(
(a << 3), llvm::hashing::detail::fetch32(s + 4));
}
static inline llvm::hash_code our_hash_combine(llvm::hash_code seed, llvm::hash_code v) {
return seed ^ (v + 0x9e3779b9 + (seed<<6) + (seed>>2));
}
/// Copy and paste from Metadata.cpp.
namespace {
template<typename PackType>
class PackCacheEntry {
public:
size_t Count;
const PackType * const * getElements() const {
return reinterpret_cast<const PackType * const *>(this + 1);
}
const PackType ** getElements() {
return reinterpret_cast<const PackType **>(this + 1);
}
struct Key {
const PackType *const *Data;
const size_t Count;
size_t getCount() const {
return Count;
}
const PackType *getElement(size_t index) const {
assert(index < Count);
return Data[index];
}
friend llvm::hash_code hash_value(const Key &key) {
llvm::hash_code hash = 0;
for (size_t i = 0; i != key.getCount(); ++i) {
hash = our_hash_combine(hash, our_hash_integer_value(
reinterpret_cast<uint64_t>(key.getElement(i))));
}
return hash;
}
};
PackCacheEntry(const Key &key);
intptr_t getKeyIntValueForDump() {
return 0; // No single meaningful value here.
}
bool matchesKey(const Key &key) const {
if (key.getCount() != Count)
return false;
for (unsigned i = 0; i != Count; ++i) {
if (key.getElement(i) != getElements()[i])
return false;
}
return true;
}
friend llvm::hash_code hash_value(const PackCacheEntry<PackType> &value) {
llvm::hash_code hash = 0;
for (size_t i = 0; i != value.Count; ++i) {
hash = our_hash_combine(hash, our_hash_integer_value(
reinterpret_cast<uint64_t>(value.getElements()[i])));
}
return hash;
}
static size_t getExtraAllocationSize(const Key &key) {
return getExtraAllocationSize(key.Count);
}
size_t getExtraAllocationSize() const {
return getExtraAllocationSize(Count);
}
static size_t getExtraAllocationSize(unsigned count) {
return count * sizeof(const Metadata * const *);
}
};
template<typename PackType>
PackCacheEntry<PackType>::PackCacheEntry(
const typename PackCacheEntry<PackType>::Key &key) {
Count = key.getCount();
for (unsigned i = 0; i < Count; ++i)
getElements()[i] = key.getElement(i);
}
} // end anonymous namespace
/// The uniquing structure for metadata packs.
static SimpleGlobalCache<PackCacheEntry<Metadata>,
MetadataPackTag> MetadataPacks;
SWIFT_RUNTIME_EXPORT SWIFT_CC(swift)
const Metadata * const *
swift_allocateMetadataPack(const Metadata * const *ptr, size_t count) {
if (MetadataPackPointer(reinterpret_cast<uintptr_t>(ptr)).getLifetime()
== PackLifetime::OnHeap)
return ptr;
PackCacheEntry<Metadata>::Key key{ptr, count};
auto bytes = MetadataPacks.getOrInsert(key).first->getElements();
MetadataPackPointer pack(bytes, PackLifetime::OnHeap);
return pack.getPointer();
}
/// The uniquing structure for witness table packs.
static SimpleGlobalCache<PackCacheEntry<WitnessTable>,
WitnessTablePackTag> WitnessTablePacks;
SWIFT_RUNTIME_EXPORT SWIFT_CC(swift)
const WitnessTable * const *
swift_allocateWitnessTablePack(const WitnessTable * const *ptr, size_t count) {
if (WitnessTablePackPointer(reinterpret_cast<uintptr_t>(ptr)).getLifetime()
== PackLifetime::OnHeap)
return ptr;
PackCacheEntry<WitnessTable>::Key key{ptr, count};
auto bytes = WitnessTablePacks.getOrInsert(key).first->getElements();
WitnessTablePackPointer pack(bytes, PackLifetime::OnHeap);
return pack.getPointer();
}
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