[itanium demangler] Add llvm::itaniumFindTypesInMangledName()

This function calls a callback whenever a <type> is parsed.

This is necessary to implement FindAlternateFunctionManglings in LLDB, which
uses a similar hack in FastDemangle. Once that function has been updated to use
this version, FastDemangle can finally be removed.

Differential revision: https://reviews.llvm.org/D50586

1 files changed, 6 insertions, 0 deletions

diff --git a/libcxxabi/src/cxa_demangle.cpp b/libcxxabi/src/cxa_demangle.cpp
index 3a7ee061c94..9f58a0c6e4c 100644
--- a/libcxxabi/src/cxa_demangle.cpp
+++ b/libcxxabi/src/cxa_demangle.cpp
@@ -1976,6 +1976,9 @@ struct Db {
   // conversion operator's type, and are resolved in the enclosing <encoding>.
   PODSmallVector<ForwardTemplateReference *, 4> ForwardTemplateRefs;
 
+  void (*TypeCallback)(void *, const char *) = nullptr;
+  void *TypeCallbackContext = nullptr;
+
   bool TryToParseTemplateArgs = true;
   bool PermitForwardTemplateReferences = false;
   bool ParsingLambdaParams = false;
@@ -3218,6 +3221,9 @@ Node *Db::parseQualifiedType() {
 Node *Db::parseType() {
   Node *Result = nullptr;
 
+  if (TypeCallback != nullptr)
+    TypeCallback(TypeCallbackContext, First);
+
   switch (look()) {
   //             ::= <qualified-type>
   case 'r':