Fix parsing of complicated C++ names

Summary:
CPlusPlusLanguage::MethodName was not correctly parsing templated functions whose demangled name
included the return type -- the space before the function name was included in the "context" and
the context itself was not terminated correctly due to a misuse of the substr function (second
argument is length, not the end position). Fix that and add a regression test.

Reviewers: clayborg

Subscribers: lldb-commits

Differential Revision: https://reviews.llvm.org/D23608

llvm-svn: 279038

lldb/source/Plugins/Language/CPlusPlus/CPlusPlusLanguage.cpp

@@ -220,6 +220,8 @@ CPlusPlusLanguage::MethodName::Parse()
                         context_start = full.rfind(' ', template_start);
                         if (context_start == llvm::StringRef::npos)
                             context_start = 0;
+                        else
+                            ++context_start;
 
                         context_end = full.rfind(':', template_start);
                         if (context_end == llvm::StringRef::npos || context_end < context_start)
@@ -240,7 +242,7 @@ CPlusPlusLanguage::MethodName::Parse()
                 else
                 {
                     if (context_start < context_end)
-                        m_context = full.substr(context_start, context_end - 1);
+                        m_context = full.substr(context_start, context_end - 1 - context_start);
                     const size_t basename_begin = context_end + 1;
                     m_basename = full.substr(basename_begin, basename_end - basename_begin);
                 }

lldb/unittests/CMakeLists.txt

@@ -43,6 +43,7 @@ add_subdirectory(Editline)
 add_subdirectory(Expression)
 add_subdirectory(Host)
 add_subdirectory(Interpreter)
+add_subdirectory(Language)
 add_subdirectory(Process)
 add_subdirectory(ScriptInterpreter)
 add_subdirectory(Symbol)

lldb/unittests/Language/CMakeLists.txt

@@ -0,0 +1 @@
+add_subdirectory(CPlusPlus)

lldb/unittests/Language/CPlusPlus/CMakeLists.txt

@@ -0,0 +1,3 @@
+add_lldb_unittest(LanguageCPlusPlusTests
+  CPlusPlusLanguageTest.cpp
+  )

lldb/unittests/Language/CPlusPlus/CPlusPlusLanguageTest.cpp

@@ -0,0 +1,41 @@
+//===-- CPlusPlusLanguageTest.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 "Plugins/Language/CPlusPlus/CPlusPlusLanguage.h"
+
+using namespace lldb_private;
+
+TEST(CPlusPlusLanguage, MethodName)
+{
+    struct TestCase {
+        std::string input;
+        std::string context, basename, arguments, qualifiers, scope_qualified_name;
+    };
+
+    TestCase test_cases[] = {{"foo::bar(baz)", "foo", "bar", "(baz)", "", "foo::bar"},
+                             {"std::basic_ostream<char, std::char_traits<char> >& "
+                              "std::operator<<<std::char_traits<char> >"
+                              "(std::basic_ostream<char, std::char_traits<char> >&, char const*)",
+                              "std", "operator<<<std::char_traits<char> >",
+                              "(std::basic_ostream<char, std::char_traits<char> >&, char const*)", "",
+                              "std::operator<<<std::char_traits<char> >"}};
+
+    for (const auto &test: test_cases)
+    {
+        CPlusPlusLanguage::MethodName method(ConstString(test.input));
+        EXPECT_TRUE(method.IsValid());
+        EXPECT_EQ(test.context, method.GetContext());
+        EXPECT_EQ(test.basename, method.GetBasename());
+        EXPECT_EQ(test.arguments, method.GetArguments());
+        EXPECT_EQ(test.qualifiers, method.GetQualifiers());
+        EXPECT_EQ(test.scope_qualified_name, method.GetScopeQualifiedName());
+    }
+}