[PATCH] D104340: [Demangle] Support Rust v0 mangling scheme in llvm::demangle

[Tomasz Miąsko via Phabricator via llvm-commits]

tmiasko created this revision.
tmiasko added a reviewer: dblaikie.
Herald added subscribers: JDevlieghere, hiraditya.
tmiasko requested review of this revision.
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The llvm::demangle is currently used by llvm-objdump and llvm-readobj,
so this effectively adds support for Rust v0 mangling to those
applications.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D104340

Files:
  llvm/lib/Demangle/Demangle.cpp
  llvm/unittests/Demangle/DemangleTest.cpp


Index: llvm/unittests/Demangle/DemangleTest.cpp
===================================================================
--- llvm/unittests/Demangle/DemangleTest.cpp
+++ llvm/unittests/Demangle/DemangleTest.cpp
@@ -21,6 +21,7 @@
             "invocation function for block in foo(int)");
   EXPECT_EQ(demangle("?foo@@YAXH at Z"), "void __cdecl foo(int)");
   EXPECT_EQ(demangle("foo"), "foo");
+  EXPECT_EQ(demangle("_RNvC3foo3bar"), "foo::bar");
 
   // Regression test for demangling of optional template-args for vendor
   // extended type qualifier (https://bugs.llvm.org/show_bug.cgi?id=48009)
Index: llvm/lib/Demangle/Demangle.cpp
===================================================================
--- llvm/lib/Demangle/Demangle.cpp
+++ llvm/lib/Demangle/Demangle.cpp
@@ -19,10 +19,17 @@
   return Pos > 0 && Pos <= 4 && MangledName[Pos] == 'Z';
 }
 
+static bool isRustEncoding(const std::string &MangledName) {
+  return MangledName.size() >= 2 && MangledName[0] == '_' &&
+         MangledName[1] == 'R';
+}
+
 std::string llvm::demangle(const std::string &MangledName) {
   char *Demangled;
   if (isItaniumEncoding(MangledName))
     Demangled = itaniumDemangle(MangledName.c_str(), nullptr, nullptr, nullptr);
+  else if (isRustEncoding(MangledName))
+    Demangled = rustDemangle(MangledName.c_str(), nullptr, nullptr, nullptr);
   else
     Demangled = microsoftDemangle(MangledName.c_str(), nullptr, nullptr,
                                   nullptr, nullptr);


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