Introduce llvm-install-name-tool

This diff adds a new "driver" for llvm-objcopy
which is supposed to emulate the behavior of install-name-tool.
This is a recommit of b5913e6d2 with ubsan issues fixed.

Differential revision: https://reviews.llvm.org/D69146

Test plan: make check-all

1 files changed, 15 insertions, 5 deletions

diff --git a/llvm/tools/llvm-objcopy/llvm-objcopy.cpp b/llvm/tools/llvm-objcopy/llvm-objcopy.cpp
index a68210f..e662f35 100644
--- a/llvm/tools/llvm-objcopy/llvm-objcopy.cpp
+++ b/llvm/tools/llvm-objcopy/llvm-objcopy.cpp
@@ -313,11 +313,20 @@ static Error executeObjcopy(CopyConfig &Config) {
   return Error::success();
 }
 
+namespace {
+
+enum class ToolType { Objcopy, Strip, InstallNameTool };
+
+} // anonymous namespace
+
 int main(int argc, char **argv) {
   InitLLVM X(argc, argv);
   ToolName = argv[0];
-  bool IsStrip = sys::path::stem(ToolName).contains("strip");
-
+  ToolType Tool = StringSwitch<ToolType>(sys::path::stem(ToolName))
+                      .EndsWith("strip", ToolType::Strip)
+                      .EndsWith("install-name-tool", ToolType::InstallNameTool)
+                      .EndsWith("install_name_tool", ToolType::InstallNameTool)
+                      .Default(ToolType::Objcopy);
   // Expand response files.
   // TODO: Move these lines, which are copied from lib/Support/CommandLine.cpp,
   // into a separate function in the CommandLine library and call that function
@@ -332,10 +341,11 @@ int main(int argc, char **argv) {
                           NewArgv);
 
   auto Args = makeArrayRef(NewArgv).drop_front();
-
   Expected<DriverConfig> DriverConfig =
-      IsStrip ? parseStripOptions(Args, reportWarning)
-              : parseObjcopyOptions(Args, reportWarning);
+      (Tool == ToolType::Strip) ? parseStripOptions(Args, reportWarning)
+                                : ((Tool == ToolType::InstallNameTool)
+                                       ? parseInstallNameToolOptions(Args)
+                                       : parseObjcopyOptions(Args, reportWarning));
   if (!DriverConfig) {
     logAllUnhandledErrors(DriverConfig.takeError(),
                           WithColor::error(errs(), ToolName));