[lldb][libc++] Adds slice_array data formatters. (#85544)

Co-authored-by: Michael Buch <michaelbuch12@gmail.com>

2 files changed, 34 insertions, 0 deletions

diff --git a/lldb/test/API/functionalities/data-formatter/data-formatter-stl/libcxx/valarray/TestDataFormatterLibcxxValarray.py b/lldb/test/API/functionalities/data-formatter/data-formatter-stl/libcxx/valarray/TestDataFormatterLibcxxValarray.py
index 7b54b34..b59b770 100644
--- a/lldb/test/API/functionalities/data-formatter/data-formatter-stl/libcxx/valarray/TestDataFormatterLibcxxValarray.py
+++ b/lldb/test/API/functionalities/data-formatter/data-formatter-stl/libcxx/valarray/TestDataFormatterLibcxxValarray.py
@@ -18,6 +18,10 @@ class LibcxxChronoDataFormatterTestCase(TestBase):
             self, "break here", lldb.SBFileSpec("main.cpp", False)
         )
 
+        #
+        # std::valarray
+        #
+
         self.expect(
             "frame variable va_int",
             substrs=[
@@ -76,3 +80,30 @@ class LibcxxChronoDataFormatterTestCase(TestBase):
             error=True,
             substrs=['array index 4 is not valid for "(valarray<double>) va_double"'],
         )
+
+        #
+        # std::slice_array
+        #
+
+        self.expect(
+            "frame variable sa",
+            substrs=[
+                "sa = stride=2 size=4",
+                "[0] = 1",
+                "[1] = 3",
+                "[2] = 5",
+                "[3] = 7",
+                "}",
+            ],
+        )
+
+        # check access-by-index
+        self.expect("frame variable sa[0]", substrs=["1"])
+        self.expect("frame variable sa[1]", substrs=["3"])
+        self.expect("frame variable sa[2]", substrs=["5"])
+        self.expect("frame variable sa[3]", substrs=["7"])
+        self.expect(
+            "frame variable sa[4]",
+            error=True,
+            substrs=['array index 4 is not valid for "(slice_array<int>) sa"'],
+        )
diff --git a/lldb/test/API/functionalities/data-formatter/data-formatter-stl/libcxx/valarray/main.cpp b/lldb/test/API/functionalities/data-formatter/data-formatter-stl/libcxx/valarray/main.cpp
index f32921e..1481d8b 100644
--- a/lldb/test/API/functionalities/data-formatter/data-formatter-stl/libcxx/valarray/main.cpp
+++ b/lldb/test/API/functionalities/data-formatter/data-formatter-stl/libcxx/valarray/main.cpp
@@ -13,5 +13,8 @@ int main() {
 
   std::valarray<double> va_double({1.0, 0.5, 0.25, 0.125});
 
+  std::valarray<int> va({0, 1, 2, 3, 4, 5, 6, 7, 8, 9});
+  std::slice_array<int> sa = va[std::slice(1, 4, 2)];
+
   std::cout << "break here\n";
 }