[LLDB][DataFormatter] Add support for std::__map_const_iterator

This patch adds support for formatting `std::map::const_iterator`.
It's just a matter of adding `const_` to the existing regex.

**Testing**

* Added test case to existing API tests

Differential Revision: https://reviews.llvm.org/D129962

3 files changed, 17 insertions, 2 deletions

diff --git a/lldb/source/Plugins/Language/CPlusPlus/CPlusPlusLanguage.cpp b/lldb/source/Plugins/Language/CPlusPlus/CPlusPlusLanguage.cpp
index db87aae6656b..23ce1654fb83 100644
--- a/lldb/source/Plugins/Language/CPlusPlus/CPlusPlusLanguage.cpp
+++ b/lldb/source/Plugins/Language/CPlusPlus/CPlusPlusLanguage.cpp
@@ -909,7 +909,7 @@ static void LoadLibCxxFormatters(lldb::TypeCategoryImplSP cpp_category_sp) {
       cpp_category_sp,
       lldb_private::formatters::LibCxxMapIteratorSyntheticFrontEndCreator,
       "std::map iterator synthetic children",
-      ConstString("^std::__[[:alnum:]]+::__map_iterator<.+>$"), stl_synth_flags,
+      ConstString("^std::__[[:alnum:]]+::__map_(const_)?iterator<.+>$"), stl_synth_flags,
       true);
 
   AddCXXSynthetic(
diff --git a/lldb/test/API/functionalities/data-formatter/data-formatter-stl/libcxx/map/TestDataFormatterLibccMap.py b/lldb/test/API/functionalities/data-formatter/data-formatter-stl/libcxx/map/TestDataFormatterLibccMap.py
index e0111ea189f9..097a1e649d43 100644
--- a/lldb/test/API/functionalities/data-formatter/data-formatter-stl/libcxx/map/TestDataFormatterLibccMap.py
+++ b/lldb/test/API/functionalities/data-formatter/data-formatter-stl/libcxx/map/TestDataFormatterLibccMap.py
@@ -116,6 +116,16 @@ class LibcxxMapDataFormatterTestCase(TestBase):
                     substrs=['first =',
                              'second ='])
 
+        # (Non-)const key/val iterators
+        self.expect_expr("it", result_children=[
+            ValueCheck(name="first", value="0"),
+            ValueCheck(name="second", value="0")
+        ])
+        self.expect_expr("const_it", result_children=[
+            ValueCheck(name="first", value="0"),
+            ValueCheck(name="second", value="0")
+        ])
+
         # check that MightHaveChildren() gets it right
         self.assertTrue(
             self.frame().FindVariable("ii").MightHaveChildren(),
diff --git a/lldb/test/API/functionalities/data-formatter/data-formatter-stl/libcxx/map/main.cpp b/lldb/test/API/functionalities/data-formatter/data-formatter-stl/libcxx/map/main.cpp
index da6eca985d20..43ce6aeefd2a 100644
--- a/lldb/test/API/functionalities/data-formatter/data-formatter-stl/libcxx/map/main.cpp
+++ b/lldb/test/API/functionalities/data-formatter/data-formatter-stl/libcxx/map/main.cpp
@@ -24,7 +24,12 @@ int main()
     
     ii[0] = 0; // Set break point at this line.
     ii[1] = 1;
-	thefoo_rw(1);  // Set break point at this line.
+
+    intint_map::iterator it = ii.begin();
+    intint_map::const_iterator const_it = ii.cbegin();
+    std::printf("%d %d\n", it->second, const_it->second);
+
+    thefoo_rw(1); // Set break point at this line.
     ii[2] = 0;
     ii[3] = 1;
 	thefoo_rw(1);  // Set break point at this line.