llvm-project
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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
15using namespace llvm;
16using 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.
23static CommonLinkerContext *lctx;
24
25CommonLinkerContext::CommonLinkerContext() {
26lctx = this;
27// Fire off the static initializations in CGF's constructor.
28codegen::RegisterCodeGenFlags CGF;
29}
30
31CommonLinkerContext::~CommonLinkerContext() {
32assert(lctx);
33// Explicitly call the destructors since we created the objects with placement
34// new in SpecificAlloc::create().
35for (auto &it : instances)
36it.second->~SpecificAllocBase();
37lctx = nullptr;
38}
39
40CommonLinkerContext &lld::commonContext() {
41assert(lctx);
42return *lctx;
43}
44
45bool lld::hasContext() { return lctx != nullptr; }
46
47void CommonLinkerContext::destroy() {
48if (lctx == nullptr)
49return;
50delete lctx;
51}
52