llvm-project

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//===- CommonLinkerContext.cpp --------------------------------------------===//
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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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#include "lld/Common/CommonLinkerContext.h"
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#include "lld/Common/ErrorHandler.h"
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#include "lld/Common/Memory.h"
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#include "llvm/CodeGen/CommandFlags.h"
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using namespace llvm;
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using namespace lld;
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// Reference to the current LLD instance. This is a temporary situation, until
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// we pass this context everywhere by reference, or we make it a thread_local,
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// as in https://reviews.llvm.org/D108850?id=370678 where each thread can be
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// associated with a LLD instance. Only then will LLD be free of global
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// state.
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static CommonLinkerContext *lctx;
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CommonLinkerContext::CommonLinkerContext() {
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  lctx = this;
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  // Fire off the static initializations in CGF's constructor.
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  codegen::RegisterCodeGenFlags CGF;
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}
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CommonLinkerContext::~CommonLinkerContext() {
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  assert(lctx);
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  // Explicitly call the destructors since we created the objects with placement
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  // new in SpecificAlloc::create().
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  for (auto &it : instances)
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    it.second->~SpecificAllocBase();
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  lctx = nullptr;
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}
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CommonLinkerContext &lld::commonContext() {
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  assert(lctx);
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  return *lctx;
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}
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bool lld::hasContext() { return lctx != nullptr; }
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void CommonLinkerContext::destroy() {
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  if (lctx == nullptr)
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    return;
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  delete lctx;
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}
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