[lldb] Consult Language plugin in GetDisplayDemangledName

[kastiglione]

Give language plugins the opportunity to provide a language specific display name.

This will be used in a follow up commit. The purpose of this change is to ultimately display breakpoint locations with a more human friendly demangling of Swift symbols.

[llvmbot]

@llvm/pr-subscribers-lldb

Author: Dave Lee (kastiglione)

Changes

---

Full diff: https://github.com/llvm/llvm-project/pull/90294.diff

2 Files Affected:

• (modified) lldb/include/lldb/Target/Language.h (+4)
• (modified) lldb/source/Core/Mangled.cpp (+2)

diff --git a/lldb/include/lldb/Target/Language.h b/lldb/include/lldb/Target/Language.h
index 67714e6fdf942e..ff7c60bf68bfc9 100644
--- a/lldb/include/lldb/Target/Language.h
+++ b/lldb/include/lldb/Target/Language.h
@@ -281,6 +281,10 @@ class Language : public PluginInterface {
     return mangled.GetMangledName();
   }
 
+  virtual ConstString GetDisplayDemangledName(Mangled mangled) const {
+    return mangled.GetDemangledName();
+  }
+
   virtual void GetExceptionResolverDescription(bool catch_on, bool throw_on,
                                                Stream &s);
 
diff --git a/lldb/source/Core/Mangled.cpp b/lldb/source/Core/Mangled.cpp
index b167c51fdce247..8efc4c639cca5f 100644
--- a/lldb/source/Core/Mangled.cpp
+++ b/lldb/source/Core/Mangled.cpp
@@ -310,6 +310,8 @@ ConstString Mangled::GetDemangledName() const {
 }
 
 ConstString Mangled::GetDisplayDemangledName() const {
+  if (Language *lang = Language::FindPlugin(GuessLanguage()))
+    return lang->GetDisplayDemangledName(*this);
   return GetDemangledName();
 }