[LLD][COFF] Factor out LinkerDriver::setMachine (NFC)

lld/COFF/Driver.cpp

@@ -591,6 +591,14 @@ std::optional<StringRef> LinkerDriver::findLibIfNew(StringRef filename) {
   return path;
 }
 
+void LinkerDriver::setMachine(MachineTypes machine) {
+  assert(ctx.config.machine == IMAGE_FILE_MACHINE_UNKNOWN);
+  assert(machine != IMAGE_FILE_MACHINE_UNKNOWN);
+
+  ctx.config.machine = machine;
+  addWinSysRootLibSearchPaths();
+}
+
 void LinkerDriver::detectWinSysRoot(const opt::InputArgList &Args) {
   IntrusiveRefCntPtr<vfs::FileSystem> VFS = vfs::getRealFileSystem();
 
@@ -1887,10 +1895,10 @@ void LinkerDriver::linkerMain(ArrayRef<const char *> argsArr) {
   {
     llvm::TimeTraceScope timeScope2("Machine arg");
     if (auto *arg = args.getLastArg(OPT_machine)) {
-      config->machine = getMachineType(arg->getValue());
-      if (config->machine == IMAGE_FILE_MACHINE_UNKNOWN)
+      MachineTypes machine = getMachineType(arg->getValue());
+      if (machine == IMAGE_FILE_MACHINE_UNKNOWN)
         Fatal(ctx) << "unknown /machine argument: " << arg->getValue();
-      addWinSysRootLibSearchPaths();
+      setMachine(machine);
     }
   }
 
@@ -2298,8 +2306,7 @@ void LinkerDriver::linkerMain(ArrayRef<const char *> argsArr) {
   // not we assume x64.
   if (config->machine == IMAGE_FILE_MACHINE_UNKNOWN) {
     Warn(ctx) << "/machine is not specified. x64 is assumed";
-    config->machine = AMD64;
-    addWinSysRootLibSearchPaths();
+    setMachine(AMD64);
   }
   config->wordsize = config->is64() ? 8 : 4;
 

lld/COFF/Driver.h

@@ -80,9 +80,7 @@ class LinkerDriver {
 
   void linkerMain(llvm::ArrayRef<const char *> args);
 
-  // Adds various search paths based on the sysroot.  Must only be called once
-  // config->machine has been set.
-  void addWinSysRootLibSearchPaths();
+  void setMachine(llvm::COFF::MachineTypes machine);
 
   void addClangLibSearchPaths(const std::string &argv0);
 
@@ -116,6 +114,10 @@ class LinkerDriver {
   // Determines the location of the sysroot based on `args`, environment, etc.
   void detectWinSysRoot(const llvm::opt::InputArgList &args);
 
+  // Adds various search paths based on the sysroot.  Must only be called once
+  // config->machine has been set.
+  void addWinSysRootLibSearchPaths();
+
   // Symbol names are mangled by prepending "_" on x86.
   StringRef mangle(StringRef sym);
 

lld/COFF/SymbolTable.cpp

@@ -95,8 +95,7 @@ void SymbolTable::addFile(InputFile *file) {
   if (ctx.config.machine == IMAGE_FILE_MACHINE_UNKNOWN &&
       mt != IMAGE_FILE_MACHINE_UNKNOWN) {
     ctx.config.machineInferred = true;
-    ctx.config.machine = mt;
-    ctx.driver.addWinSysRootLibSearchPaths();
+    ctx.driver.setMachine(mt);
   }
 
   ctx.driver.parseDirectives(file);