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//===- TypePool.h -----------------------------------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_DWARFLINKER_PARALLEL_TYPEPOOL_H
#define LLVM_DWARFLINKER_PARALLEL_TYPEPOOL_H
#include "ArrayList.h"
#include "llvm/ADT/ConcurrentHashtable.h"
#include "llvm/ADT/StringMap.h"
#include "llvm/CodeGen/DIE.h"
#include "llvm/Support/Allocator.h"
#include <atomic>
namespace llvm {
namespace dwarf_linker {
namespace parallel {
class TypePool;
class CompileUnit;
class TypeEntryBody;
using TypeEntry = StringMapEntry<std::atomic<TypeEntryBody *>>;
/// Keeps cloned data for the type DIE.
class TypeEntryBody {
public:
/// Returns copy of type DIE which should be emitted into resulting file.
DIE &getFinalDie() const {
if (Die)
return *Die;
assert(DeclarationDie);
return *DeclarationDie;
}
/// Returns true if type die entry has only declaration die.
bool hasOnlyDeclaration() const { return Die == nullptr; }
/// Creates type DIE for the specified name.
static TypeEntryBody *
create(llvm::parallel::PerThreadBumpPtrAllocator &Allocator) {
TypeEntryBody *Result = Allocator.Allocate<TypeEntryBody>();
new (Result) TypeEntryBody(Allocator);
return Result;
}
/// TypeEntryBody keeps partially cloned DIEs corresponding to this type.
/// The two kinds of DIE can be kept: declaration and definition.
/// If definition DIE was met while parsing input DWARF then this DIE would
/// be used as a final DIE for this type. If definition DIE is not met then
/// declaration DIE would be used as a final DIE.
// Keeps definition die.
std::atomic<DIE *> Die = {nullptr};
// Keeps declaration die.
std::atomic<DIE *> DeclarationDie = {nullptr};
// True if parent type die is declaration.
std::atomic<bool> ParentIsDeclaration = {true};
/// Children for current type.
ArrayList<TypeEntry *, 5> Children;
protected:
TypeEntryBody() = delete;
TypeEntryBody(const TypeEntryBody &RHS) = delete;
TypeEntryBody(TypeEntryBody &&RHS) = delete;
TypeEntryBody &operator=(const TypeEntryBody &RHS) = delete;
TypeEntryBody &operator=(const TypeEntryBody &&RHS) = delete;
TypeEntryBody(llvm::parallel::PerThreadBumpPtrAllocator &Allocator)
: Children(&Allocator) {}
};
class TypeEntryInfo {
public:
/// \returns Hash value for the specified \p Key.
static inline uint64_t getHashValue(const StringRef &Key) {
return xxh3_64bits(Key);
}
/// \returns true if both \p LHS and \p RHS are equal.
static inline bool isEqual(const StringRef &LHS, const StringRef &RHS) {
return LHS == RHS;
}
/// \returns key for the specified \p KeyData.
static inline StringRef getKey(const TypeEntry &KeyData) {
return KeyData.getKey();
}
/// \returns newly created object of KeyDataTy type.
static inline TypeEntry *
create(const StringRef &Key,
llvm::parallel::PerThreadBumpPtrAllocator &Allocator) {
return TypeEntry::create(Key, Allocator);
}
};
/// TypePool keeps type descriptors which contain partially cloned DIE
/// correspinding to each type. Types are identified by names.
class TypePool
: ConcurrentHashTableByPtr<StringRef, TypeEntry,
llvm::parallel::PerThreadBumpPtrAllocator,
TypeEntryInfo> {
public:
TypePool()
: ConcurrentHashTableByPtr<StringRef, TypeEntry,
llvm::parallel::PerThreadBumpPtrAllocator,
TypeEntryInfo>(Allocator) {
Root = TypeEntry::create("", Allocator);
Root->getValue().store(TypeEntryBody::create(Allocator));
}
TypeEntry *insert(StringRef Name) {
return ConcurrentHashTableByPtr<StringRef, TypeEntry,
llvm::parallel::PerThreadBumpPtrAllocator,
TypeEntryInfo>::insert(Name)
.first;
}
/// Create or return existing type entry body for the specified \p Entry.
/// Link that entry as child for the specified \p ParentEntry.
/// \returns The existing or created type entry body.
TypeEntryBody *getOrCreateTypeEntryBody(TypeEntry *Entry,
TypeEntry *ParentEntry) {
TypeEntryBody *DIE = Entry->getValue().load();
if (DIE)
return DIE;
TypeEntryBody *NewDIE = TypeEntryBody::create(Allocator);
if (Entry->getValue().compare_exchange_weak(DIE, NewDIE)) {
ParentEntry->getValue().load()->Children.add(Entry);
return NewDIE;
}
return DIE;
}
/// Sort children for each kept type entry.
void sortTypes() {
std::function<void(TypeEntry * Entry)> SortChildrenRec =
[&](TypeEntry *Entry) {
Entry->getValue().load()->Children.sort(TypesComparator);
Entry->getValue().load()->Children.forEach(SortChildrenRec);
};
SortChildrenRec(getRoot());
}
/// Return root for all type entries.
TypeEntry *getRoot() const { return Root; }
/// Return thread local allocator used by pool.
BumpPtrAllocator &getThreadLocalAllocator() {
return Allocator.getThreadLocalAllocator();
}
protected:
std::function<bool(const TypeEntry *LHS, const TypeEntry *RHS)>
TypesComparator = [](const TypeEntry *LHS, const TypeEntry *RHS) -> bool {
return LHS->getKey() < RHS->getKey();
};
// Root of all type entries.
TypeEntry *Root = nullptr;
private:
llvm::parallel::PerThreadBumpPtrAllocator Allocator;
};
} // end of namespace parallel
} // end of namespace dwarf_linker
} // end of namespace llvm
#endif // LLVM_DWARFLINKER_PARALLEL_TYPEPOOL_H
|
