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 #include "llvm/CodeGen/CommandFlags.h" 14 15 using namespace llvm; 16 using namespace lld; 17 18 // Reference to the current LLD instance. This is a temporary situation, until 19 // we pass this context everywhere by reference, or we make it a thread_local, 20 // as in https://reviews.llvm.org/D108850?id=370678 where each thread can be 21 // associated with a LLD instance. Only then will LLD be free of global 22 // state. 23 static CommonLinkerContext *lctx; 24 25 CommonLinkerContext::CommonLinkerContext() { 26 lctx = this; 27 // Fire off the static initializations in CGF's constructor. 28 codegen::RegisterCodeGenFlags CGF; 29 } 30 31 CommonLinkerContext::~CommonLinkerContext() { 32 assert(lctx); 33 // Explicitly call the destructors since we created the objects with placement 34 // new in SpecificAlloc::create(). 35 for (auto &it : instances) 36 it.second->~SpecificAllocBase(); 37 lctx = nullptr; 38 } 39 40 CommonLinkerContext &lld::commonContext() { 41 assert(lctx); 42 return *lctx; 43 } 44 45 bool lld::hasContext() { return lctx != nullptr; } 46 47 void CommonLinkerContext::destroy() { 48 if (lctx == nullptr) 49 return; 50 delete lctx; 51 } 52