1 files changed, 40 insertions, 0 deletions
diff --git a/js/src/gdb/tests/test-prettyprinters.py b/js/src/gdb/tests/test-prettyprinters.py
new file mode 100644
index 0000000000..f3329c0288
--- /dev/null
+++ b/js/src/gdb/tests/test-prettyprinters.py
@@ -0,0 +1,40 @@
+# Ignore flake8 errors "undefined name 'assert_pretty'"
+# As it caused by the way we instanciate this file
+# flake8: noqa: F821
+
+import mozilla.prettyprinters
+
+run_fragment("prettyprinters.implemented_types")
+
+
+def implemented_type_names(expr):
+    v = gdb.parse_and_eval(expr)
+    it = mozilla.prettyprinters.implemented_types(v.type)
+    return [str(_) for _ in it]
+
+
+assert_eq(implemented_type_names("i"), ["int"])
+assert_eq(implemented_type_names("a"), ["A", "int"])
+assert_eq(implemented_type_names("b"), ["B", "A", "int"])
+assert_eq(implemented_type_names("c"), ["C"])
+assert_eq(implemented_type_names("c_"), ["C_", "C"])
+assert_eq(implemented_type_names("e"), ["E", "C", "D"])
+assert_eq(implemented_type_names("e_"), ["E_", "E", "C", "D"])
+
+# Some compilers strip trivial typedefs in the debuginfo from classes' base
+# classes. Sometimes this can be fixed with -fno-eliminate-unused-debug-types,
+# but not always. Allow this test to pass if the typedefs are stripped.
+#
+# It would probably be better to figure out how to make the compiler emit them,
+# since I think this test is here for a reason.
+if gdb.lookup_type("F").fields()[0].name == "C_":
+    # We have the typedef info.
+    assert_eq(implemented_type_names("f"), ["F", "C_", "D_", "C", "D"])
+    assert_eq(implemented_type_names("h"), ["H", "F", "G", "C_", "D_", "C", "D"])
+else:
+    assert_eq(implemented_type_names("f"), ["F", "C", "D"])
+    assert_eq(implemented_type_names("h"), ["H", "F", "G", "C", "D"])
+
+# Check that our pretty-printers aren't interfering with printing other types.
+assert_pretty("10", "10")
+assert_pretty("(void*) 0", "")  # Because of 'set print address off'