libclang Name Mangling API

libclang-NameMangling.patch

Index: include/clang-c/Index.h
===================================================================
--- include/clang-c/Index.h	(revision 156043)
+++ include/clang-c/Index.h	(working copy)
@@ -4737,10 +4737,32 @@
  * @}
  */
 
+/** \defgroup CINDEX_MANGLE Name Mangling API Functions
+ *
+ * @{
+ */
+
 /**
+ * \brief Represents the different available ABIs for name mangling.
+ */
+typedef enum {
+  CXMangleABI_Itanium   = 0,
+  CXMangleABI_Microsoft = 1,
+} CXMangleABI;
+
+/**
+ * \brief Retrieve the CXString representing the mangled name of the cursor.
+ */
+CINDEX_LINKAGE CXString clang_Cursor_getMangling(CXCursor, CXMangleABI);
+
+/**
  * @}
  */
 
+/**
+ * @}
+ */
+
 #ifdef __cplusplus
 }
 #endif
Index: tools/libclang/CXCursor.cpp
===================================================================
--- tools/libclang/CXCursor.cpp	(revision 156043)
+++ tools/libclang/CXCursor.cpp	(working copy)
@@ -24,6 +24,7 @@
 #include "clang/AST/Expr.h"
 #include "clang/AST/ExprCXX.h"
 #include "clang/AST/ExprObjC.h"
+#include "clang/AST/Mangle.h"
 #include "clang-c/Index.h"
 #include "llvm/Support/ErrorHandling.h"
 
@@ -1253,5 +1254,39 @@
   
   pool.AvailableCursors.push_back(Vec);
 }
+
+CXString clang_Cursor_getMangling(CXCursor C, CXMangleABI ABI) {
+	if (clang_isInvalid(C.kind) ||
+		!clang_isDeclaration(C.kind))
+		return cxstring::createCXString("");
+
+	Decl* D = getCursorDecl(C);
+
+	if(!D || !isa<NamedDecl>(D))
+		return cxstring::createCXString("");
+
+	NamedDecl* ND = static_cast<NamedDecl*>(D);
+	
+	ASTContext& AC = ND->getASTContext();
+	
+	llvm::OwningPtr<MangleContext> MC;
+
+	switch(ABI) {
+		default:
+			llvm_unreachable("Unknown mangling ABI");
+			break;
+		case CXMangleABI_Itanium:
+			MC.reset(createItaniumMangleContext(AC, AC.getDiagnostics()));
+			break;
+		case CXMangleABI_Microsoft:
+			MC.reset(createMicrosoftMangleContext(AC, AC.getDiagnostics()));
+			break;
+	}
+
+	std::string Mangled;
+	MC->mangleName(ND, llvm::raw_string_ostream(Mangled));
+
+	return cxstring::createCXString(Mangled);
+}
   
 } // end: extern "C"

@tritao did you ever propose this as a formal patch? I would be interested in seeing this in libclang - have done a similar thing in my project (not as neatly, and only for Itanium).

FWIW, I added this (though heavily modified) to upstream clang in r214410.