Add TestMultipleHits.py

This tests that lldb handles the situation when a single instruction triggers
multiple watchpoint hits. It currently fails on arm due to what appears to be a
lldb-server bug (pr30758).

llvm-svn: 284819

lldb/packages/Python/lldbsuite/test/functionalities/watchpoint/multiple_hits/Makefile

@@ -0,0 +1,5 @@
+LEVEL = ../../../make
+
+CXX_SOURCES := main.cpp
+
+include $(LEVEL)/Makefile.rules

lldb/packages/Python/lldbsuite/test/functionalities/watchpoint/multiple_hits/TestMultipleHits.py

@@ -0,0 +1,58 @@
+"""
+Test handling of cases when a single instruction triggers multiple watchpoints
+"""
+
+from __future__ import print_function
+
+
+import os
+import time
+import lldb
+from lldbsuite.test.decorators import *
+from lldbsuite.test.lldbtest import *
+from lldbsuite.test import lldbutil
+
+
+class MultipleHitsTestCase(TestBase):
+
+    mydir = TestBase.compute_mydir(__file__)
+    NO_DEBUG_INFO_TESTCASE = True
+
+    @expectedFailureAll(
+        oslist=["windows"],
+        bugnumber="llvm.org/pr24446: WINDOWS XFAIL TRIAGE - Watchpoints not supported on Windows")
+    @skipIf(bugnumber="llvm.org/pr30758", oslist=["linux"], archs=["arm", "aarch64"])
+    def test(self):
+        self.build()
+        exe = os.path.join(os.getcwd(), "a.out")
+        target = self.dbg.CreateTarget(exe)
+        self.assertTrue(target and target.IsValid(), VALID_TARGET)
+
+        bp = target.BreakpointCreateByName("main")
+        self.assertTrue(bp and bp.IsValid(), "Breakpoint is valid")
+
+        process = target.LaunchSimple(None, None,
+                self.get_process_working_directory())
+        self.assertEqual(process.GetState(), lldb.eStateStopped)
+
+        thread = lldbutil.get_stopped_thread(process, lldb.eStopReasonBreakpoint)
+        self.assertIsNotNone(thread)
+
+        frame = thread.GetFrameAtIndex(0)
+        self.assertTrue(frame and frame.IsValid(), "Frame is valid")
+
+        buf = frame.FindValue("buf", lldb.eValueTypeVariableGlobal)
+        self.assertTrue(buf and buf.IsValid(), "buf is valid")
+
+        for i in [0, target.GetAddressByteSize()]:
+            member = buf.GetChildAtIndex(i)
+            self.assertTrue(member and member.IsValid(), "member is valid")
+
+            error = lldb.SBError()
+            watch = member.Watch(True, True, True, error)
+            self.assertTrue(error.Success())
+
+        process.Continue();
+        self.assertEqual(process.GetState(), lldb.eStateStopped)
+        self.assertEqual(thread.GetStopReason(), lldb.eStopReasonWatchpoint)
+

lldb/packages/Python/lldbsuite/test/functionalities/watchpoint/multiple_hits/main.cpp

@@ -0,0 +1,29 @@
+//===-- 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 <stdio.h>
+#include <stdint.h>
+
+alignas(16) uint8_t buf[32];
+
+// This uses inline assembly to generate an instruction that writes to a large
+// block of memory. If it fails on your compiler/architecture, please add
+// appropriate code to generate a large write to "buf". If you cannot write at
+// least 2*sizeof(void*) bytes with a single instruction, you will have to skip
+// this test.
+
+int main() {
+#if defined(__i386__) || defined(__x86_64__)
+  asm volatile ("movdqa %%xmm0, %0" : : "m"(buf));
+#elif defined(__arm__)
+  asm volatile ("stm %0, { r0, r1, r2, r3 }" : : "r"(buf));
+#elif defined(__aarch64__)
+  asm volatile ("stp x0, x1, %0" : : "m"(buf));
+#endif
+  return 0;
+}