forked from OSchip/llvm-project
146 lines
5.4 KiB
Python
146 lines
5.4 KiB
Python
"""
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Test conditionally break on a function and inspect its variables.
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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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# rdar://problem/8532131
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# lldb not able to digest the clang-generated debug info correctly with respect to function name
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#
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# This class currently fails for clang as well as llvm-gcc.
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class ConditionalBreakTestCase(TestBase):
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mydir = os.path.join("functionalities", "conditional_break")
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@unittest2.skipUnless(sys.platform.startswith("darwin"), "requires Darwin")
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@python_api_test
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@dsym_test
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def test_with_dsym_python(self):
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"""Exercise some thread and frame APIs to break if c() is called by a()."""
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self.buildDsym()
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self.do_conditional_break()
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@python_api_test
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@dwarf_test
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def test_with_dwarf_python(self):
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"""Exercise some thread and frame APIs to break if c() is called by a()."""
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self.buildDwarf()
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self.do_conditional_break()
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@unittest2.skipUnless(sys.platform.startswith("darwin"), "requires Darwin")
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@dsym_test
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def test_with_dsym_command(self):
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"""Simulate a user using lldb commands to break on c() if called from a()."""
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self.buildDsym()
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self.simulate_conditional_break_by_user()
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@dwarf_test
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def test_with_dwarf_command(self):
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"""Simulate a user using lldb commands to break on c() if called from a()."""
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self.buildDwarf()
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self.simulate_conditional_break_by_user()
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def do_conditional_break(self):
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"""Exercise some thread and frame APIs to break if c() is called by a()."""
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exe = os.path.join(os.getcwd(), "a.out")
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target = self.dbg.CreateTarget(exe)
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self.assertTrue(target, VALID_TARGET)
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breakpoint = target.BreakpointCreateByName("c", exe)
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self.assertTrue(breakpoint, VALID_BREAKPOINT)
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# Now launch the process, and do not stop at entry point.
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process = target.LaunchSimple(None, None, os.getcwd())
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self.assertTrue(process, PROCESS_IS_VALID)
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# The stop reason of the thread should be breakpoint.
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self.assertTrue(process.GetState() == lldb.eStateStopped,
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STOPPED_DUE_TO_BREAKPOINT)
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# Find the line number where a's parent frame function is c.
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line = line_number('main.c',
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"// Find the line number where c's parent frame is a here.")
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# Suppose we are only interested in the call scenario where c()'s
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# immediate caller is a() and we want to find out the value passed from
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# a().
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#
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# The 10 in range(10) is just an arbitrary number, which means we would
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# like to try for at most 10 times.
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for j in range(10):
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if self.TraceOn():
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print "j is: ", j
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thread = process.GetThreadAtIndex(0)
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if thread.GetNumFrames() >= 2:
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frame0 = thread.GetFrameAtIndex(0)
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name0 = frame0.GetFunction().GetName()
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frame1 = thread.GetFrameAtIndex(1)
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name1 = frame1.GetFunction().GetName()
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#lldbutil.print_stacktrace(thread)
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self.assertTrue(name0 == "c", "Break on function c()")
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if (name1 == "a"):
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# By design, we know that a() calls c() only from main.c:27.
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# In reality, similar logic can be used to find out the call
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# site.
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self.assertTrue(frame1.GetLineEntry().GetLine() == line,
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"Immediate caller a() at main.c:%d" % line)
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# And the local variable 'val' should have a value of (int) 3.
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val = frame1.FindVariable("val")
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self.assertTrue(val.GetTypeName() == "int", "'val' has int type")
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self.assertTrue(val.GetValue() == "3", "'val' has a value of 3")
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break
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process.Continue()
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def simulate_conditional_break_by_user(self):
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"""Simulate a user using lldb commands to break on c() if called from a()."""
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# Sourcing .lldb in the current working directory, which sets the main
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# executable, sets the breakpoint on c(), and adds the callback for the
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# breakpoint such that lldb only stops when the caller of c() is a().
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# the "my" package that defines the date() function.
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if self.TraceOn():
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print "About to source .lldb"
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if not self.TraceOn():
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self.HideStdout()
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self.runCmd("command source .lldb")
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if self.TraceOn():
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print "About to run."
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self.runCmd("run", RUN_SUCCEEDED)
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if self.TraceOn():
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print "Done running"
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# The stop reason of the thread should be breakpoint.
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self.expect("thread list", STOPPED_DUE_TO_BREAKPOINT,
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substrs = ['stopped', 'stop reason = breakpoint'])
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# The frame info for frame #0 points to a.out`c and its immediate caller
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# (frame #1) points to a.out`a.
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self.expect("frame info", "We should stop at c()",
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substrs = ["a.out`c"])
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# Select our parent frame as the current frame.
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self.runCmd("frame select 1")
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self.expect("frame info", "The immediate caller should be a()",
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substrs = ["a.out`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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