136d27ab4d
This patch does the same thing as r365595 to other subdirectories, which completes the naming style change for the entire lld directory. With this, the naming style conversion is complete for lld. Differential Revision: https://reviews.llvm.org/D64473 llvm-svn: 365730
60 lines
2.0 KiB
C++
60 lines
2.0 KiB
C++
//===- Memory.h -------------------------------------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines arena allocators.
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//
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// Almost all large objects, such as files, sections or symbols, are
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// used for the entire lifetime of the linker once they are created.
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// This usage characteristic makes arena allocator an attractive choice
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// where the entire linker is one arena. With an arena, newly created
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// objects belong to the arena and freed all at once when everything is done.
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// Arena allocators are efficient and easy to understand.
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// Most objects are allocated using the arena allocators defined by this file.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLD_COMMON_MEMORY_H
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#define LLD_COMMON_MEMORY_H
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#include "llvm/Support/Allocator.h"
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#include "llvm/Support/StringSaver.h"
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#include <vector>
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namespace lld {
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// Use this arena if your object doesn't have a destructor.
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extern llvm::BumpPtrAllocator bAlloc;
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extern llvm::StringSaver saver;
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void freeArena();
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// These two classes are hack to keep track of all
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// SpecificBumpPtrAllocator instances.
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struct SpecificAllocBase {
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SpecificAllocBase() { instances.push_back(this); }
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virtual ~SpecificAllocBase() = default;
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virtual void reset() = 0;
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static std::vector<SpecificAllocBase *> instances;
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};
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template <class T> struct SpecificAlloc : public SpecificAllocBase {
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void reset() override { alloc.DestroyAll(); }
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llvm::SpecificBumpPtrAllocator<T> alloc;
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};
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// Use this arena if your object has a destructor.
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// Your destructor will be invoked from freeArena().
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template <typename T, typename... U> T *make(U &&... args) {
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static SpecificAlloc<T> alloc;
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return new (alloc.alloc.Allocate()) T(std::forward<U>(args)...);
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}
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} // namespace lld
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#endif
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