[Lldb-commits] [PATCH] D103439: [lldb] Print the backtrace for all threads if the test breakpoint can't be hit

Raphael Isemann via Phabricator via lldb-commits lldb-commits at lists.llvm.org
Tue Jun 1 00:27:40 PDT 2021

teemperor created this revision.
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At the moment if a test fails to hits the breakpoint we set in `run_to_source_breakpoint`
the test suite just prints:

  AssertionError: 0 != 1 : Expected 1 thread to stop at breakpoint, 0 did

Often these errors happen because the debuggee crashed before that breakpoint is being
hit or the process failed to launch but it's hard to tell what happened from the current error.

This patch adds that we now print the backtrace of all threads in case the test failed
because we didn't hit the right breakpoint

  rG LLVM Github Monorepo



Index: lldb/packages/Python/lldbsuite/test/lldbutil.py
--- lldb/packages/Python/lldbsuite/test/lldbutil.py
+++ lldb/packages/Python/lldbsuite/test/lldbutil.py
@@ -840,6 +840,12 @@
     return threads
+def get_thread_overview(test):
+    """Returns a string providing an overview over all current threads.
+    Should be used for making test errors more expressive."""
+    test.runCmd("thread backtrace all")
+    return "Current threads:\n" + test.res.GetOutput()
 # Helper functions for run_to_{source,name}_breakpoint:
 def run_to_breakpoint_make_target(test, exe_name = "a.out", in_cwd = True):
@@ -897,9 +903,13 @@
     num_threads = len(threads)
     if only_one_thread:
-        test.assertEqual(num_threads, 1, "Expected 1 thread to stop at breakpoint, %d did."%(num_threads))
+        test.assertEqual(num_threads, 1,
+                         "Expected 1 thread to stop at breakpoint, %d did.\n%s"
+                         % (num_threads, get_thread_overview(test)))
-        test.assertGreater(num_threads, 0, "No threads stopped at breakpoint")
+        test.assertGreater(num_threads, 0,
+                           "No threads stopped at breakpoint.\n%s" %
+                           (get_thread_overview(test)))
     thread = threads[0]
     return (target, process, thread, bkpt)

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