llvm-undname: Add support for demangling typeinfo names
typeinfo names aren't symbols but string constant contents
stored in compiler-generated typeinfo objects, but llvm-cxxfilt
can demangle these for Itanium names.
In the MSVC ABI, these are just a '.' followed by a mangled
type -- this means they don't start with '?' like all MS-mangled
symbols do.
Differential Revision: https://reviews.llvm.org/D67851
llvm-svn: 372602
diff --git a/llvm/lib/Demangle/MicrosoftDemangle.cpp b/llvm/lib/Demangle/MicrosoftDemangle.cpp
index bf7d776..4be6e5a 100644
--- a/llvm/lib/Demangle/MicrosoftDemangle.cpp
+++ b/llvm/lib/Demangle/MicrosoftDemangle.cpp
@@ -783,8 +783,26 @@
return S;
}
+SymbolNode *Demangler::demangleTypeinfoName(StringView &MangledName) {
+ assert(MangledName.startsWith('.'));
+ MangledName.consumeFront('.');
+
+ TypeNode *T = demangleType(MangledName, QualifierMangleMode::Result);
+ if (Error || !MangledName.empty()) {
+ Error = true;
+ return nullptr;
+ }
+ return synthesizeVariable(Arena, T, "`RTTI Type Descriptor Name'");
+}
+
// Parser entry point.
SymbolNode *Demangler::parse(StringView &MangledName) {
+ // Typeinfo names are strings stored in RTTI data. They're not symbol names.
+ // It's still useful to demangle them. They're the only demangled entity
+ // that doesn't start with a "?" but a ".".
+ if (MangledName.startsWith('.'))
+ return demangleTypeinfoName(MangledName);
+
if (MangledName.startsWith("??@"))
return demangleMD5Name(MangledName);