lld/Common/CommonLinkerContext.cpp

   1 //===- CommonLinkerContext.cpp --------------------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #include "lld/Common/CommonLinkerContext.h"
  10 #include "lld/Common/ErrorHandler.h"
  11 #include "lld/Common/Memory.h"
  12
  13 using namespace llvm;
  14 using namespace lld;
  15
  16 // Reference to the current LLD instance. This is a temporary situation, until
  17 // we pass this context everywhere by reference, or we make it a thread_local,
  18 // as in https://reviews.llvm.org/D108850?id=370678 where each thread can be
  19 // associated with a LLD instance. Only then will LLD be free of global
  20 // state.
  21 static CommonLinkerContext *lctx;
  22
  23 CommonLinkerContext::CommonLinkerContext() { lctx = this; }
  24
  25 CommonLinkerContext::~CommonLinkerContext() {
  26   assert(lctx);
  27   // Explicitly call the destructors since we created the objects with placement
  28   // new in SpecificAlloc::create().
  29   for (auto &it : instances)
  30     it.second->~SpecificAllocBase();
  31   lctx = nullptr;
  32 }
  33
  34 CommonLinkerContext &lld::commonContext() {
  35   assert(lctx);
  36   return *lctx;
  37 }
  38
  39 bool lld::hasContext() { return lctx != nullptr; }
  40
  41 void CommonLinkerContext::destroy() {
  42   if (lctx == nullptr)
  43     return;
  44   delete lctx;
  45 }