9381eb1045
I thought for a while about how to remove it, but it looks like we can just copy the file for now. Of course I'm not happy about that, but it's just less than 50 lines of code, and we already have duplicate code in Error.h and some other places. I want to solve them all at once later. Differential Revision: https://reviews.llvm.org/D27819 llvm-svn: 290062
68 lines
2.1 KiB
C++
68 lines
2.1 KiB
C++
//===- Memory.h -------------------------------------------------*- C++ -*-===//
|
|
//
|
|
// The LLVM Linker
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file defines arena allocators.
|
|
//
|
|
// Almost all large objects, such as files, sections or symbols, are
|
|
// used for the entire lifetime of the linker once they are created.
|
|
// This usage characteristic makes arena allocator an attractive choice
|
|
// where the entire linker is one arena. With an arena, newly created
|
|
// objects belong to the arena and freed all at once when everything is done.
|
|
// Arena allocators are efficient and easy to understand.
|
|
// Most objects are allocated using the arena allocators defined by this file.
|
|
//
|
|
// If you edit this file, please edit COFF/Memory.h too.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef LLD_ELF_MEMORY_H
|
|
#define LLD_ELF_MEMORY_H
|
|
|
|
#include "llvm/Support/Allocator.h"
|
|
#include "llvm/Support/StringSaver.h"
|
|
#include <vector>
|
|
|
|
namespace lld {
|
|
namespace elf {
|
|
|
|
// Use this arena if your object doesn't have a destructor.
|
|
extern llvm::BumpPtrAllocator BAlloc;
|
|
extern llvm::StringSaver Saver;
|
|
|
|
// These two classes are hack to keep track of all
|
|
// SpecificBumpPtrAllocator instances.
|
|
struct SpecificAllocBase {
|
|
SpecificAllocBase() { Instances.push_back(this); }
|
|
virtual ~SpecificAllocBase() = default;
|
|
virtual void reset() = 0;
|
|
static std::vector<SpecificAllocBase *> Instances;
|
|
};
|
|
|
|
template <class T> struct SpecificAlloc : public SpecificAllocBase {
|
|
void reset() override { Alloc.DestroyAll(); }
|
|
llvm::SpecificBumpPtrAllocator<T> Alloc;
|
|
};
|
|
|
|
// Use this arena if your object has a destructor.
|
|
// Your destructor will be invoked from freeArena().
|
|
template <typename T, typename... U> T *make(U &&... Args) {
|
|
static SpecificAlloc<T> Alloc;
|
|
return new (Alloc.Alloc.Allocate()) T(std::forward<U>(Args)...);
|
|
}
|
|
|
|
inline void freeArena() {
|
|
for (SpecificAllocBase *Alloc : SpecificAllocBase::Instances)
|
|
Alloc->reset();
|
|
BAlloc.Reset();
|
|
}
|
|
}
|
|
}
|
|
|
|
#endif
|