From bfd00ae31ea25ff02884a9cbb0b64f0372817101 Mon Sep 17 00:00:00 2001
From: Fangrui Song <i@maskray.me>
Date: Tue, 11 Jan 2022 18:31:25 -0800
Subject: [PATCH] [lld-link] Change config and driver to unique_ptr

Similar to D116143. My x86-64 `lld` is ~5KiB smaller.

Reviewed By: mstorsjo

Differential Revision: https://reviews.llvm.org/D116996
---
 lld/COFF/Config.h   | 2 +-
 lld/COFF/Driver.cpp | 8 ++++----
 lld/COFF/Driver.h   | 3 +--
 3 files changed, 6 insertions(+), 7 deletions(-)

diff --git a/lld/COFF/Config.h b/lld/COFF/Config.h
index 3917975e165d..5597389b4226 100644
--- a/lld/COFF/Config.h
+++ b/lld/COFF/Config.h
@@ -282,7 +282,7 @@ struct Configuration {
   bool stdcallFixup = false;
 };
 
-extern Configuration *config;
+extern std::unique_ptr<Configuration> config;
 
 } // namespace coff
 } // namespace lld
diff --git a/lld/COFF/Driver.cpp b/lld/COFF/Driver.cpp
index 6178d328e3f5..f8da63c5edbf 100644
--- a/lld/COFF/Driver.cpp
+++ b/lld/COFF/Driver.cpp
@@ -60,8 +60,8 @@ using namespace llvm::sys;
 namespace lld {
 namespace coff {
 
-Configuration *config;
-LinkerDriver *driver;
+std::unique_ptr<Configuration> config;
+std::unique_ptr<LinkerDriver> driver;
 
 bool link(ArrayRef<const char *> args, bool canExitEarly, raw_ostream &stdoutOS,
           raw_ostream &stderrOS) {
@@ -80,8 +80,8 @@ bool link(ArrayRef<const char *> args, bool canExitEarly, raw_ostream &stdoutOS,
   stderrOS.enable_colors(stderrOS.has_colors());
 
   COFFLinkerContext ctx;
-  config = make<Configuration>();
-  driver = make<LinkerDriver>(ctx);
+  config = std::make_unique<Configuration>();
+  driver = std::make_unique<LinkerDriver>(ctx);
 
   driver->linkerMain(args);
 
diff --git a/lld/COFF/Driver.h b/lld/COFF/Driver.h
index 77e67b282665..518ec1470677 100644
--- a/lld/COFF/Driver.h
+++ b/lld/COFF/Driver.h
@@ -30,8 +30,7 @@
 namespace lld {
 namespace coff {
 
-class LinkerDriver;
-extern LinkerDriver *driver;
+extern std::unique_ptr<class LinkerDriver> driver;
 
 using llvm::COFF::MachineTypes;
 using llvm::COFF::WindowsSubsystem;