Add data formatter for libc++'s forward_list

Summary:
This adds a data formatter for the implementation of forward_list in
libc++. I've refactored the existing std::list data formatter a bit to
enable more sharing of code (mainly the loop detection stuff).

Reviewers: jingham, EricWF

Subscribers: srhines, eugene, lldb-commits

Differential Revision: https://reviews.llvm.org/D35556

llvm-svn: 316992

3 files changed, 66 insertions, 0 deletions

diff --git a/lldb/packages/Python/lldbsuite/test/functionalities/data-formatter/data-formatter-stl/libcxx/forward_list/Makefile b/lldb/packages/Python/lldbsuite/test/functionalities/data-formatter/data-formatter-stl/libcxx/forward_list/Makefile
new file mode 100644
index 00000000000..bf75013f531
--- /dev/null
+++ b/lldb/packages/Python/lldbsuite/test/functionalities/data-formatter/data-formatter-stl/libcxx/forward_list/Makefile
@@ -0,0 +1,6 @@
+LEVEL = ../../../../../make
+
+CXX_SOURCES := main.cpp
+
+USE_LIBCPP := 1
+include $(LEVEL)/Makefile.rules
diff --git a/lldb/packages/Python/lldbsuite/test/functionalities/data-formatter/data-formatter-stl/libcxx/forward_list/TestDataFormatterLibcxxForwardList.py b/lldb/packages/Python/lldbsuite/test/functionalities/data-formatter/data-formatter-stl/libcxx/forward_list/TestDataFormatterLibcxxForwardList.py
new file mode 100644
index 00000000000..1cc454a473a
--- /dev/null
+++ b/lldb/packages/Python/lldbsuite/test/functionalities/data-formatter/data-formatter-stl/libcxx/forward_list/TestDataFormatterLibcxxForwardList.py
@@ -0,0 +1,53 @@
+"""
+Test lldb data formatter subsystem.
+"""
+
+from __future__ import print_function
+
+
+import lldb
+from lldbsuite.test.decorators import *
+from lldbsuite.test.lldbtest import *
+from lldbsuite.test import lldbutil
+
+
+class TestDataFormatterLibcxxForwardList(TestBase):
+
+    mydir = TestBase.compute_mydir(__file__)
+
+    def setUp(self):
+        TestBase.setUp(self)
+        self.line = line_number('main.cpp', '// break here')
+        ns = 'ndk' if lldbplatformutil.target_is_android() else ''
+        self.namespace = 'std::__' + ns + '1'
+
+    @add_test_categories(["libc++"])
+    def test(self):
+        """Test that std::forward_list is displayed correctly"""
+        self.build()
+        lldbutil.run_to_source_breakpoint(self, '// break here',
+                lldb.SBFileSpec("main.cpp", False))
+
+        forward_list = self.namespace + '::forward_list'
+        self.expect("frame variable empty",
+                    substrs=[forward_list,
+                             'size=0',
+                             '{}'])
+
+        self.expect("frame variable one_elt",
+                    substrs=[forward_list,
+                             'size=1',
+                             '{',
+                             '[0] = 47',
+                             '}'])
+
+        self.expect("frame variable five_elts",
+                    substrs=[forward_list,
+                             'size=5',
+                             '{',
+                             '[0] = 1',
+                             '[1] = 22',
+                             '[2] = 333',
+                             '[3] = 4444',
+                             '[4] = 55555',
+                             '}'])
diff --git a/lldb/packages/Python/lldbsuite/test/functionalities/data-formatter/data-formatter-stl/libcxx/forward_list/main.cpp b/lldb/packages/Python/lldbsuite/test/functionalities/data-formatter/data-formatter-stl/libcxx/forward_list/main.cpp
new file mode 100644
index 00000000000..73abda6e82e
--- /dev/null
+++ b/lldb/packages/Python/lldbsuite/test/functionalities/data-formatter/data-formatter-stl/libcxx/forward_list/main.cpp
@@ -0,0 +1,7 @@
+#include <forward_list>
+
+int main()
+{
+  std::forward_list<int> empty{}, one_elt{47}, five_elts{1,22,333,4444,55555};
+  return 0; // break here
+}