Use LLVM's new ItaniumPartialDemangler in LLDB

Summary:
Replace the existing combination of FastDemangle and the fallback to llvm::itaniumDemangle() with LLVM's new ItaniumPartialDemangler. It slightly reduces complexity and slightly improves performance, but doesn't introduce conceptual changes. This patch is preparing for more fundamental improvements on LLDB's demangling approach.

Reviewers: friss, jingham, erik.pilkington, labath, clayborg, mgorny, davide, JDevlieghere

Reviewed By: JDevlieghere

Subscribers: teemperor, JDevlieghere, labath, clayborg, davide, lldb-commits, mgorny, erik.pilkington

Differential Revision: https://reviews.llvm.org/D49612

llvm-svn: 337931

1 files changed, 38 insertions, 0 deletions

diff --git a/lldb/unittests/Core/MangledTest.cpp b/lldb/unittests/Core/MangledTest.cpp
new file mode 100644
index 00000000000..7deb901f560
--- /dev/null
+++ b/lldb/unittests/Core/MangledTest.cpp
@@ -0,0 +1,38 @@
+//===-- MangledTest.cpp -----------------------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "gtest/gtest.h"
+
+#include "lldb/Core/Mangled.h"
+
+using namespace lldb;
+using namespace lldb_private;
+
+TEST(MangledTest, ResultForValidName) {
+  ConstString MangledName("_ZN1a1b1cIiiiEEvm");
+  bool IsMangled = true;
+
+  Mangled TheMangled(MangledName, IsMangled);
+  const ConstString &TheDemangled =
+      TheMangled.GetDemangledName(eLanguageTypeC_plus_plus);
+
+  ConstString ExpectedResult("void a::b::c<int, int, int>(unsigned long)");
+  EXPECT_STREQ(ExpectedResult.GetCString(), TheDemangled.GetCString());
+}
+
+TEST(MangledTest, EmptyForInvalidName) {
+  ConstString MangledName("_ZN1a1b1cmxktpEEvm");
+  bool IsMangled = true;
+
+  Mangled TheMangled(MangledName, IsMangled);
+  const ConstString &TheDemangled =
+      TheMangled.GetDemangledName(eLanguageTypeC_plus_plus);
+
+  EXPECT_STREQ("", TheDemangled.GetCString());
+}