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783550be62
Starting with Windows 10, the Windows loader is itself multi-threaded, meaning that the loader spins up a few threads to do process initialization before it executes main. Windows delivers these notifications asynchronously and they can come out of order, so we can't be sure that the first thread we get a notification about is actually the zero'th thread. This patch fixes this by requesting the thread stopped at the breakpoint that was specified, rather than getting thread 0 and verifying that it is stopped at a breakpoint. Differential Revision: http://reviews.llvm.org/D16247 llvm-svn: 258432
135 lines
5.1 KiB
Python
135 lines
5.1 KiB
Python
"""
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Test conditionally break on a function and inspect its variables.
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"""
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from __future__ import print_function
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import os, time
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import re
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import lldb
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import lldbsuite.test.lldbutil as lldbutil
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from lldbsuite.test.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 = TestBase.compute_mydir(__file__)
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@add_test_categories(['pyapi'])
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def test_with_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.build()
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self.do_conditional_break()
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def test_with_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.build()
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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, self.get_process_working_directory())
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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 = lldbutil.get_one_thread_stopped_at_breakpoint(process, breakpoint)
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self.assertIsNotNone(thread, "Expected one thread to be stopped at the breakpoint")
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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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# Separate out the "file a.out" command from .lldb file, for the sake of
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# remote testsuite.
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self.runCmd("file a.out")
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self.runCmd("command source .lldb")
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self.runCmd ("break list")
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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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self.runCmd ("break list")
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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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