Add more constness to module-related APIs

llvm-svn: 206595

clang/include/clang/Basic/Module.h

@@ -307,7 +307,7 @@ public:
   
   /// \brief Determine whether this module is a submodule of the given other
   /// module.
-  bool isSubModuleOf(Module *Other) const;
+  bool isSubModuleOf(const Module *Other) const;
   
   /// \brief Determine whether this module is a part of a framework,
   /// either because it is a framework module or because it is a submodule

clang/include/clang/Lex/ModuleMap.h

@@ -258,7 +258,7 @@ public:
   /// \brief Determine whether the given header is unavailable as part
   /// of the specified module.
   bool isHeaderUnavailableInModule(const FileEntry *Header,
-                                   Module *RequestingModule) const;
+                                   const Module *RequestingModule) const;
 
   /// \brief Retrieve a module with the given name.
   ///

clang/lib/Basic/Module.cpp

@@ -91,7 +91,7 @@ Module::isAvailable(const LangOptions &LangOpts, const TargetInfo &Target,
   llvm_unreachable("could not find a reason why module is unavailable");
 }
 
-bool Module::isSubModuleOf(Module *Other) const {
+bool Module::isSubModuleOf(const Module *Other) const {
   const Module *This = this;
   do {
     if (This == Other)

clang/lib/Lex/ModuleMap.cpp

@@ -411,8 +411,9 @@ bool ModuleMap::isHeaderInUnavailableModule(const FileEntry *Header) const {
   return isHeaderUnavailableInModule(Header, 0);
 }
 
-bool ModuleMap::isHeaderUnavailableInModule(const FileEntry *Header,
-                                            Module *RequestingModule) const {
+bool
+ModuleMap::isHeaderUnavailableInModule(const FileEntry *Header,
+                                       const Module *RequestingModule) const {
   HeadersMap::const_iterator Known = Headers.find(Header);
   if (Known != Headers.end()) {
     for (SmallVectorImpl<KnownHeader>::const_iterator