[Lldb-commits] [lldb] r240030 - Add new test for stress testing stack unwinding
Tamas Berghammer
tberghammer at google.com
Thu Jun 18 10:17:32 PDT 2015
Author: tberghammer
Date: Thu Jun 18 12:17:32 2015
New Revision: 240030
URL: http://llvm.org/viewvc/llvm-project?rev=240030&view=rev
Log:
Add new test for stress testing stack unwinding
This test case generates new tests from the source files dropped into
its directory. For stress testing stack unwinding it steps through the
code line by line and then tests unwinding from each instruction.
Added:
lldb/trunk/test/functionalities/unwind/standard/
lldb/trunk/test/functionalities/unwind/standard/Makefile
lldb/trunk/test/functionalities/unwind/standard/TestStandardUnwind.py
lldb/trunk/test/functionalities/unwind/standard/hand_written/
lldb/trunk/test/functionalities/unwind/standard/hand_written/fprintf.cpp
lldb/trunk/test/functionalities/unwind/standard/hand_written/new_delete.cpp
Added: lldb/trunk/test/functionalities/unwind/standard/Makefile
URL: http://llvm.org/viewvc/llvm-project/lldb/trunk/test/functionalities/unwind/standard/Makefile?rev=240030&view=auto
==============================================================================
--- lldb/trunk/test/functionalities/unwind/standard/Makefile (added)
+++ lldb/trunk/test/functionalities/unwind/standard/Makefile Thu Jun 18 12:17:32 2015
@@ -0,0 +1,3 @@
+LEVEL = ../../../make
+
+include $(LEVEL)/Makefile.rules
Added: lldb/trunk/test/functionalities/unwind/standard/TestStandardUnwind.py
URL: http://llvm.org/viewvc/llvm-project/lldb/trunk/test/functionalities/unwind/standard/TestStandardUnwind.py?rev=240030&view=auto
==============================================================================
--- lldb/trunk/test/functionalities/unwind/standard/TestStandardUnwind.py (added)
+++ lldb/trunk/test/functionalities/unwind/standard/TestStandardUnwind.py Thu Jun 18 12:17:32 2015
@@ -0,0 +1,138 @@
+"""
+Test that we can backtrace correctly from standard functions.
+
+This test suit is a collection of automatically generated tests from the source files in the
+directory. Please DON'T add individual test cases to this file.
+
+To add a new test case to this test suit please create a simple C/C++ application and put the
+source file into the directory of the test cases. The test suit will automatically pick the
+file up and generate a test case from it in run time (with name test_standard_unwind_<file_name>
+after escaping some special characters).
+"""
+
+import os, time
+import unittest2
+import lldb
+from lldbtest import *
+import lldbutil
+
+test_source_dirs = ["."]
+
+class StandardUnwindTest(TestBase):
+ mydir = TestBase.compute_mydir(__file__)
+
+ def standard_unwind_tests (self):
+ # The following variables have to be defined for each architecture and OS we testing for:
+ # base_function_names: List of function names where we accept that the stack unwinding is
+ # correct if they are on the stack. It should include the bottom most
+ # function on the stack and a list of functions where we know we can't
+ # unwind for any reason (list of expected failure functions)
+ # no_step_function_names: The list of functions where we don't want to step through
+ # instruction by instruction for any reason. (A valid reason is if
+ # it is impossible to step through a function instruction by
+ # instruction because it is special for some reason.) For these
+ # functions we will immediately do a step-out when we hit them.
+
+ triple = self.dbg.GetSelectedPlatform().GetTriple()
+ if re.match("arm-.*-.*-android", triple):
+ base_function_names = [
+ "_start", # Base function on the stack
+ "__memcpy_base", # Function reached by a fall through from the previous function
+ "__memcpy_base_aligned", # Function reached by a fall through from the previous function
+ "__subdf3", # __aeabi_ui2d jumps into the middle of the function. Possibly missing symbol?
+ "__aeabi_ldivmod", # llvm.org/pr23879 ("push {sp}" not handled correctly)
+ "__aeabi_uldivmod", # llvm.org/pr23879 ("push {sp}" not handled correctly)
+ ]
+ no_step_function_names = [
+ "__sync_fetch_and_add_4", # Calls into a special SO where we can't set a breakpoint
+ "pthread_mutex_lock", # Uses ldrex and strex what interferes with the software single stepping
+ "pthread_mutex_unlock", # Uses ldrex and strex what interferes with the software single stepping
+ "pthread_once", # Uses ldrex and strex what interferes with the software single stepping
+ ]
+ else:
+ self.skipTest("No expectations for the current architecture")
+
+ exe = os.path.join(os.getcwd(), "a.out")
+ target = self.dbg.CreateTarget(exe)
+ self.assertTrue(target, VALID_TARGET)
+
+ target.BreakpointCreateByName("main")
+
+ process = target.LaunchSimple (None, None, self.get_process_working_directory())
+ self.assertTrue(process is not None, "SBTarget.Launch() failed")
+ self.assertEqual(process.GetState(), lldb.eStateStopped, "The process didn't hit main")
+
+ index = 0
+ while process.GetState() == lldb.eStateStopped:
+ index += 1
+ if process.GetNumThreads() > 1:
+ # In case of a multi threaded inferior if one of the thread is stopped in a blocking
+ # syscall and we try to step it then SBThread::StepInstruction() will block forever
+ self.skipTest("Multi threaded inferiors are not supported by this test")
+
+ thread = process.GetThreadAtIndex(0)
+
+ if self.TraceOn():
+ print "INDEX: %u" % index
+ for f in thread.frames:
+ print f
+
+ if thread.GetFrameAtIndex(0).GetFunctionName() is not None:
+ found_main = False
+ for f in thread.frames:
+ if f.GetFunctionName() in base_function_names:
+ found_main = True
+ break
+ self.assertTrue(found_main, "Main function isn't found on the backtrace")
+
+ if thread.GetFrameAtIndex(0).GetFunctionName() in no_step_function_names:
+ thread.StepOut()
+ else:
+ thread.StepInstruction(False)
+
+# Collect source files in the specified directories
+test_source_files = set([])
+for d in test_source_dirs:
+ if os.path.isabs(d):
+ dirname = d
+ else:
+ dirname = os.path.join(os.path.dirname(__file__), d)
+
+ for root, _, files in os.walk(dirname):
+ test_source_files = test_source_files | set(os.path.abspath(os.path.join(root, f)) for f in files)
+
+# Generate test cases based on the collected source files
+for f in test_source_files:
+ if f.endswith(".cpp") or f.endswith(".c"):
+ @dwarf_test
+ @unittest2.skipIf(TestBase.skipLongRunningTest(), "Skip this long running test")
+ def test_function_dwarf(self, f=f):
+ if f.endswith(".cpp"):
+ d = {'CXX_SOURCES': f}
+ elif f.endswith(".c"):
+ d = {'C_SOURCES': f}
+
+ # If we can't compile the inferior just skip the test instead of failing it.
+ # It makes the test suit more robust when testing on several different architecture
+ # avoid the hassle of skipping tests manually.
+ try:
+ self.buildDwarf(dictionary=d)
+ self.setTearDownCleanup(d)
+ except:
+ if self.TraceOn():
+ print sys.exc_info()[0]
+ self.skipTest("Inferior not supported")
+ self.standard_unwind_tests()
+
+ test_name = "test_unwind_" + str(f)
+ for c in ".=()/\\":
+ test_name = test_name.replace(c, '_')
+
+ test_function_dwarf.__name__ = test_name
+ setattr(StandardUnwindTest, test_function_dwarf.__name__, test_function_dwarf)
+
+if __name__ == '__main__':
+ import atexit
+ lldb.SBDebugger.Initialize()
+ atexit.register(lambda: lldb.SBDebugger.Terminate())
+ unittest2.main()
Added: lldb/trunk/test/functionalities/unwind/standard/hand_written/fprintf.cpp
URL: http://llvm.org/viewvc/llvm-project/lldb/trunk/test/functionalities/unwind/standard/hand_written/fprintf.cpp?rev=240030&view=auto
==============================================================================
--- lldb/trunk/test/functionalities/unwind/standard/hand_written/fprintf.cpp (added)
+++ lldb/trunk/test/functionalities/unwind/standard/hand_written/fprintf.cpp Thu Jun 18 12:17:32 2015
@@ -0,0 +1,16 @@
+//===-- main.cpp ------------------------------------------------*- C++ -*-===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include <cstdio>
+
+int
+main(int argc, char const *argv[])
+{
+ fprintf(stderr, "%d %p %s\n", argc, argv, argv[0]);
+}
Added: lldb/trunk/test/functionalities/unwind/standard/hand_written/new_delete.cpp
URL: http://llvm.org/viewvc/llvm-project/lldb/trunk/test/functionalities/unwind/standard/hand_written/new_delete.cpp?rev=240030&view=auto
==============================================================================
--- lldb/trunk/test/functionalities/unwind/standard/hand_written/new_delete.cpp (added)
+++ lldb/trunk/test/functionalities/unwind/standard/hand_written/new_delete.cpp Thu Jun 18 12:17:32 2015
@@ -0,0 +1,15 @@
+//===-- main.cpp ------------------------------------------------*- C++ -*-===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+int
+main(int argc, char const *argv[])
+{
+ int* p = new int;
+ delete p;
+}
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