Implement Itanium name mangling support for C++ Modules TS.

This follows the scheme agreed with Nathan Sidwell, which can be found here:

  https://gcc.gnu.org/wiki/cxx-modules?action=AttachFile

This will be proposed to the itanium-cxx-abi list once we have some experience
with how well it works; the ABI for this TS should be considered unstable until
it is part of the Itanium C++ ABI.

llvm-svn: 312467

1 files changed, 12 insertions, 1 deletions

diff --git a/clang/lib/Lex/ModuleMap.cpp b/clang/lib/Lex/ModuleMap.cpp
index 40f78ce25ce..db2f952e3c9 100644
--- a/clang/lib/Lex/ModuleMap.cpp
+++ b/clang/lib/Lex/ModuleMap.cpp
@@ -746,8 +746,16 @@ std::pair<Module *, bool> ModuleMap::findOrCreateModule(StringRef Name,
   return std::make_pair(Result, true);
 }
 
+Module *ModuleMap::createGlobalModuleForInterfaceUnit(SourceLocation Loc) {
+  auto *Result = new Module("<global>", Loc, nullptr, /*IsFramework*/ false,
+                            /*IsExplicit*/ true, NumCreatedModules++);
+  Result->Kind = Module::GlobalModuleFragment;
+  return Result;
+}
+
 Module *ModuleMap::createModuleForInterfaceUnit(SourceLocation Loc,
-                                                StringRef Name) {
+                                                StringRef Name,
+                                                Module *GlobalModule) {
   assert(LangOpts.CurrentModule == Name && "module name mismatch");
   assert(!Modules[Name] && "redefining existing module");
 
@@ -757,6 +765,9 @@ Module *ModuleMap::createModuleForInterfaceUnit(SourceLocation Loc,
   Result->Kind = Module::ModuleInterfaceUnit;
   Modules[Name] = SourceModule = Result;
 
+  // Reparent the current global module fragment as a submodule of this module.
+  GlobalModule->setParent(Result);
+
   // Mark the main source file as being within the newly-created module so that
   // declarations and macros are properly visibility-restricted to it.
   auto *MainFile = SourceMgr.getFileEntryForID(SourceMgr.getMainFileID());