Add a test case to exercise the 'target stop-hook add' command without relying on pexpect

to spawn an lldb child command.  The test is not "correct" in that the '** Stop Hooks **'
message emitted by the Target implementation is invoked asynchronously and is using a separate:

    CommandReturnObject result;

command return object that what the driver passes to the normal command interpreter loop.
But it can help test our output serialization work.

I need to modify the test case later to maybe only test that "-o 'expr ptr'" option does indeed work.

llvm-svn: 130742

lldb/test/stop-hook/TestStopHookCmd.py

@@ -0,0 +1,71 @@
+"""
+Test lldb target stop-hook command.
+"""
+
+import os
+import unittest2
+import lldb
+import pexpect
+from lldbtest import *
+
+class StopHookCmdTestCase(TestBase):
+
+    mydir = "stop-hook"
+
+    @unittest2.skipUnless(sys.platform.startswith("darwin"), "requires Darwin")
+    def test_with_dsym(self):
+        """Test a sequence of target add-hook commands."""
+        self.buildDsym()
+        self.stop_hook_cmd_sequence()
+
+    def test_with_dwarf(self):
+        """Test a sequence of target add-hook commands."""
+        self.buildDwarf()
+        self.stop_hook_cmd_sequence()
+
+    def setUp(self):
+        # Call super's setUp().
+        TestBase.setUp(self)
+        # Find the line numbers inside main.cpp.
+        self.begl = line_number('main.cpp', '// Set breakpoint here to test target stop-hook.')
+        self.endl = line_number('main.cpp', '// End of the line range for which stop-hook is to be run.')
+        self.line = line_number('main.cpp', '// Another breakpoint which is outside of the stop-hook range.')
+
+    def stop_hook_cmd_sequence(self):
+        """Test a sequence of target stop-hook commands."""
+        exe = os.path.join(os.getcwd(), "a.out")
+        self.runCmd("file " + exe, CURRENT_EXECUTABLE_SET)
+
+        self.expect('breakpoint set -f main.cpp -l %d' % self.begl,
+                    BREAKPOINT_CREATED,
+            startstr = "Breakpoint created: 1: file ='main.cpp', line = %d" %
+                        self.begl)
+        self.expect('breakpoint set -f main.cpp -l %d' % self.line,
+                    BREAKPOINT_CREATED,
+            startstr = "Breakpoint created: 2: file ='main.cpp', line = %d" %
+                        self.line)
+
+        self.runCmd("target stop-hook add -f main.cpp -l %d -e %d -o 'expr ptr'" % (self.begl, self.endl))
+
+        self.runCmd('target stop-hook list')
+
+        # Now run the program, expect to stop at the the first breakpoint which is within the stop-hook range.
+        #self.expect('run', 'Stop hook fired',
+        #    substrs = '** Stop Hooks **')
+        self.runCmd('run')
+        self.runCmd('thread step-over')
+        self.expect('thread step-over', 'Stop hook fired again',
+            substrs = '** Stop Hooks **')
+
+        # Now continue the inferior, we'll stop at another breakpoint which is outside the stop-hook range.
+        self.runCmd('process continue')
+        # Verify that the 'Stop Hooks' mechanism is NOT BEING fired off.
+        self.expect('thread step-over', 'Stop hook should not be fired', matching=False,
+            substrs = '** Stop Hooks **')
+        
+
+if __name__ == '__main__':
+    import atexit
+    lldb.SBDebugger.Initialize()
+    atexit.register(lambda: lldb.SBDebugger.Terminate())
+    unittest2.main()