forked from OSchip/llvm-project
122 lines
5.0 KiB
Python
122 lines
5.0 KiB
Python
"""
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Use lldb Python SBFrame API to get the argument values of the call stacks.
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"""
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import os, time
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import re
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import unittest2
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import lldb, lldbutil
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from lldbtest import *
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class FrameAPITestCase(TestBase):
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mydir = os.path.join("python_api", "frame")
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@unittest2.skipUnless(sys.platform.startswith("darwin"), "requires Darwin")
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@python_api_test
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def test_get_arg_vals_for_call_stack_with_dsym(self):
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"""Exercise SBFrame.GetVariables() API to get argument vals."""
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self.buildDsym()
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self.do_get_arg_vals()
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@python_api_test
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def test_get_arg_vals_for_call_stack_with_dwarf(self):
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"""Exercise SBFrame.GetVariables() API to get argument vals."""
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self.buildDwarf()
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self.do_get_arg_vals()
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def do_get_arg_vals(self):
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"""Get argument vals for the call stack when stopped on a breakpoint."""
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exe = os.path.join(os.getcwd(), "a.out")
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# Create a target by the debugger.
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target = self.dbg.CreateTarget(exe)
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self.assertTrue(target.IsValid(), VALID_TARGET)
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# Now create a breakpoint on main.c by name 'c'.
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breakpoint = target.BreakpointCreateByName('c', 'a.out')
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#print "breakpoint:", breakpoint
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self.assertTrue(breakpoint.IsValid() and
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breakpoint.GetNumLocations() == 1,
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VALID_BREAKPOINT)
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# Now launch the process, and do not stop at the entry point.
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# Note that we don't assign the process to self.process as in other test
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# cases. We want the inferior to run till it exits and there's no need
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# for the testing framework to kill the inferior upon tearDown().
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process = target.LaunchSimple(None, None, os.getcwd())
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process = target.GetProcess()
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self.assertTrue(process.GetState() == lldb.eStateStopped,
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PROCESS_STOPPED)
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# Keeps track of the number of times 'a' is called where it is within a
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# depth of 3 of the 'c' leaf function.
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callsOfA = 0
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import StringIO
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session = StringIO.StringIO()
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while process.GetState() == lldb.eStateStopped:
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thread = process.GetThreadAtIndex(0)
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# Inspect at most 3 frames.
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numFrames = min(3, thread.GetNumFrames())
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for i in range(numFrames):
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frame = thread.GetFrameAtIndex(i)
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if self.TraceOn():
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print "frame:", frame
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name = frame.GetFunction().GetName()
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if name == 'a':
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callsOfA = callsOfA + 1
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# We'll inspect only the arguments for the current frame:
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#
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# arguments => True
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# locals => False
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# statics => False
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# in_scope_only => True
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valList = frame.GetVariables(True, False, False, True)
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argList = []
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for val in valList:
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argList.append("(%s)%s=%s" % (val.GetTypeName(),
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val.GetName(),
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val.GetValue(frame)))
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print >> session, "%s(%s)" % (name, ", ".join(argList))
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# Also check the generic pc & stack pointer. We can't test their absolute values,
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# but they should be valid. Uses get_GPRs() from the lldbutil module.
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gpr_reg_set = lldbutil.get_GPRs(frame)
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pc_value = gpr_reg_set.GetChildMemberWithName("pc")
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self.assertTrue (pc_value.IsValid(), "We should have a valid PC.")
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self.assertTrue (int(pc_value.GetValue(frame), 0) == frame.GetPC(), "PC gotten as a value should equal frame's GetPC")
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sp_value = gpr_reg_set.GetChildMemberWithName("sp")
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self.assertTrue (sp_value.IsValid(), "We should have a valid Stack Pointer.")
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self.assertTrue (int(sp_value.GetValue(frame), 0) == frame.GetSP(), "SP gotten as a value should equal frame's GetSP")
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print >> session, "---"
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process.Continue()
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# At this point, the inferior process should have exited.
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self.assertTrue(process.GetState() == lldb.eStateExited, PROCESS_EXITED)
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# Expect to find 'a' on the call stacks two times.
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self.assertTrue(callsOfA == 2,
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"Expect to find 'a' on the call stacks two times")
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# By design, the 'a' call frame has the following arg vals:
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# o a((int)val=1, (char)ch='A')
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# o a((int)val=3, (char)ch='A')
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if self.TraceOn():
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print "Full stack traces when stopped on the breakpoint 'c':"
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print session.getvalue()
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self.expect(session.getvalue(), "Argugment values displayed correctly",
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exe=False,
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substrs = ["a((int)val=1, (char)ch='A')",
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"a((int)val=3, (char)ch='A')"])
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if __name__ == '__main__':
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import atexit
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lldb.SBDebugger.Initialize()
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atexit.register(lambda: lldb.SBDebugger.Terminate())
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unittest2.main()
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