[Target] Remove Process::GetCPPLanguageRuntime

Summary:
I want to remove this method because I think that Process should be
language agnostic, or at least, not have knowledge about specific language
runtimes. There is "GetLanguageRuntime()" which should be used instead. If the
caller a CPPLanguageRuntime, they should cast it as needed. Ideally, this
should only happen in plugins that need C++ specific knowledge.

The next step I would like to do is remove "GetObjCLanguageRuntime()" as well.
There are a lot more instances of that function being used, so I wanted to
upload this one first to get the general reception to this idea.

Reviewers: compnerd, davide, JDevlieghere, jingham, clayborg, labath, aprantl

Subscribers: lldb-commits

Differential Revision: https://reviews.llvm.org/D62755

llvm-svn: 362544

lldb/include/lldb/Target/CPPLanguageRuntime.h

@@ -43,6 +43,11 @@ public:
     return lldb::eLanguageTypeC_plus_plus;
   }
 
+  static CPPLanguageRuntime *GetCPPLanguageRuntime(Process &process) {
+    return static_cast<CPPLanguageRuntime *>(
+        process.GetLanguageRuntime(lldb::eLanguageTypeC_plus_plus));
+  }
+
   virtual bool IsVTableName(const char *name) = 0;
 
   bool GetObjectDescription(Stream &str, ValueObject &object) override;

lldb/include/lldb/Target/Process.h

@@ -2184,8 +2184,6 @@ public:
   LanguageRuntime *GetLanguageRuntime(lldb::LanguageType language,
                                       bool retry_if_null = true);
 
-  CPPLanguageRuntime *GetCPPLanguageRuntime(bool retry_if_null = true);
-
   ObjCLanguageRuntime *GetObjCLanguageRuntime(bool retry_if_null = true);
 
   bool IsPossibleDynamicValue(ValueObject &in_value);

lldb/include/lldb/lldb-forward.h

@@ -43,7 +43,6 @@ class BreakpointSiteList;
 class BroadcastEventSpec;
 class Broadcaster;
 class BroadcasterManager;
-class CPPLanguageRuntime;
 class ClangASTContext;
 class ClangASTImporter;
 class ClangASTMetadata;

lldb/source/Plugins/Language/CPlusPlus/LibCxx.cpp

@@ -67,7 +67,8 @@ bool lldb_private::formatters::LibcxxFunctionSummaryProvider(
   if (process == nullptr)
     return false;
 
-  CPPLanguageRuntime *cpp_runtime = process->GetCPPLanguageRuntime();
+  CPPLanguageRuntime *cpp_runtime =
+      CPPLanguageRuntime::GetCPPLanguageRuntime(*process);
 
   if (!cpp_runtime)
     return false;

lldb/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCRuntime.cpp

@@ -462,7 +462,7 @@ lldb::SearchFilterSP AppleObjCRuntime::CreateExceptionSearchFilter() {
 
 ValueObjectSP AppleObjCRuntime::GetExceptionObjectForThread(
     ThreadSP thread_sp) {
-  auto cpp_runtime = m_process->GetCPPLanguageRuntime();
+  auto *cpp_runtime = m_process->GetLanguageRuntime(eLanguageTypeC_plus_plus);
   if (!cpp_runtime) return ValueObjectSP();
   auto cpp_exception = cpp_runtime->GetExceptionObjectForThread(thread_sp);
   if (!cpp_exception) return ValueObjectSP();

lldb/source/Target/Process.cpp

@@ -1598,16 +1598,6 @@ LanguageRuntime *Process::GetLanguageRuntime(lldb::LanguageType language,
   return runtime;
 }
 
-CPPLanguageRuntime *Process::GetCPPLanguageRuntime(bool retry_if_null) {
-  std::lock_guard<std::recursive_mutex> guard(m_language_runtimes_mutex);
-  LanguageRuntime *runtime =
-      GetLanguageRuntime(eLanguageTypeC_plus_plus, retry_if_null);
-  if (!runtime)
-    return nullptr;
-
-  return static_cast<CPPLanguageRuntime *>(runtime);
-}
-
 ObjCLanguageRuntime *Process::GetObjCLanguageRuntime(bool retry_if_null) {
   std::lock_guard<std::recursive_mutex> guard(m_language_runtimes_mutex);
   LanguageRuntime *runtime =