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"""
Use lldb Python SBFrame API to get the argument values of the call stacks.
And other SBFrame API tests.
"""
import io
import lldb
from lldbsuite.test.decorators import *
from lldbsuite.test.lldbtest import *
from lldbsuite.test import lldbutil
class FrameAPITestCase(TestBase):
def test_get_arg_vals_for_call_stack(self):
"""Exercise SBFrame.GetVariables() API to get argument vals."""
self.build()
exe = self.getBuildArtifact("a.out")
# Create a target by the debugger.
target = self.dbg.CreateTarget(exe)
self.assertTrue(target, VALID_TARGET)
# Now create a breakpoint on main.c by name 'c'.
breakpoint = target.BreakpointCreateByName("c", "a.out")
self.trace("breakpoint:", breakpoint)
self.assertTrue(
breakpoint and breakpoint.GetNumLocations() == 1, VALID_BREAKPOINT
)
# Now launch the process, and do not stop at the entry point.
process = target.LaunchSimple(None, None, self.get_process_working_directory())
process = target.GetProcess()
self.assertState(process.GetState(), lldb.eStateStopped, PROCESS_STOPPED)
# Keeps track of the number of times 'a' is called where it is within a
# depth of 3 of the 'c' leaf function.
callsOfA = 0
session = io.StringIO()
while process.GetState() == lldb.eStateStopped:
thread = lldbutil.get_stopped_thread(process, lldb.eStopReasonBreakpoint)
self.assertIsNotNone(thread)
# Inspect at most 3 frames.
numFrames = min(3, thread.GetNumFrames())
for i in range(numFrames):
frame = thread.GetFrameAtIndex(i)
if self.TraceOn():
print("frame:", frame)
name = frame.GetFunction().GetName()
if name == "a":
callsOfA = callsOfA + 1
# We'll inspect only the arguments for the current frame:
#
# arguments => True
# locals => False
# statics => False
# in_scope_only => True
valList = frame.GetVariables(True, False, False, True)
argList = []
for val in valList:
argList.append(
"(%s)%s=%s" % (val.GetTypeName(), val.GetName(), val.GetValue())
)
print("%s(%s)" % (name, ", ".join(argList)), file=session)
# Also check the generic pc & stack pointer. We can't test their absolute values,
# but they should be valid. Uses get_GPRs() from the lldbutil
# module.
gpr_reg_set = lldbutil.get_GPRs(frame)
pc_value = gpr_reg_set.GetChildMemberWithName("pc")
self.assertTrue(pc_value, "We should have a valid PC.")
pc_value_int = int(pc_value.GetValue(), 0)
# Make sure on arm targets we dont mismatch PC value on the basis of thumb bit.
# Frame PC will not have thumb bit set in case of a thumb
# instruction as PC.
if self.getArchitecture() in ["arm", "armv7", "armv7k"]:
pc_value_int &= ~1
self.assertEqual(
pc_value_int,
frame.GetPC(),
"PC gotten as a value should equal frame's GetPC",
)
sp_value = gpr_reg_set.GetChildMemberWithName("sp")
self.assertTrue(sp_value, "We should have a valid Stack Pointer.")
self.assertEqual(
int(sp_value.GetValue(), 0),
frame.GetSP(),
"SP gotten as a value should equal frame's GetSP",
)
print("---", file=session)
process.Continue()
# At this point, the inferior process should have exited.
self.assertEqual(process.GetState(), lldb.eStateExited, PROCESS_EXITED)
# Expect to find 'a' on the call stacks two times.
self.assertEqual(callsOfA, 2, "Expect to find 'a' on the call stacks two times")
# By design, the 'a' call frame has the following arg vals:
# o a((int)val=1, (char)ch='A')
# o a((int)val=3, (char)ch='A')
if self.TraceOn():
print("Full stack traces when stopped on the breakpoint 'c':")
print(session.getvalue())
self.expect(
session.getvalue(),
"Argument values displayed correctly",
exe=False,
substrs=["a((int)val=1, (char)ch='A')", "a((int)val=3, (char)ch='A')"],
)
def test_frame_api_boundary_condition(self):
"""Exercise SBFrame APIs with boundary condition inputs."""
self.build()
exe = self.getBuildArtifact("a.out")
# Create a target by the debugger.
target = self.dbg.CreateTarget(exe)
self.assertTrue(target, VALID_TARGET)
# Now create a breakpoint on main.c by name 'c'.
breakpoint = target.BreakpointCreateByName("c", "a.out")
self.trace("breakpoint:", breakpoint)
self.assertTrue(
breakpoint and breakpoint.GetNumLocations() == 1, VALID_BREAKPOINT
)
# Now launch the process, and do not stop at the entry point.
process = target.LaunchSimple(None, None, self.get_process_working_directory())
process = target.GetProcess()
self.assertState(process.GetState(), lldb.eStateStopped, PROCESS_STOPPED)
thread = lldbutil.get_stopped_thread(process, lldb.eStopReasonBreakpoint)
self.assertIsNotNone(thread)
frame = thread.GetFrameAtIndex(0)
if self.TraceOn():
print("frame:", frame)
# Boundary condition testings.
val1 = frame.FindVariable(None, True)
val2 = frame.FindVariable(None, False)
val3 = frame.FindValue(None, lldb.eValueTypeVariableGlobal)
if self.TraceOn():
print("val1:", val1)
print("val2:", val2)
frame.EvaluateExpression(None)
def test_frame_api_IsEqual(self):
"""Exercise SBFrame API IsEqual."""
self.build()
exe = self.getBuildArtifact("a.out")
# Create a target by the debugger.
target = self.dbg.CreateTarget(exe)
self.assertTrue(target, VALID_TARGET)
# Now create a breakpoint on main.c by name 'c'.
breakpoint = target.BreakpointCreateByName("c", "a.out")
self.trace("breakpoint:", breakpoint)
self.assertTrue(
breakpoint and breakpoint.GetNumLocations() == 1, VALID_BREAKPOINT
)
# Now launch the process, and do not stop at the entry point.
process = target.LaunchSimple(None, None, self.get_process_working_directory())
process = target.GetProcess()
self.assertState(process.GetState(), lldb.eStateStopped, PROCESS_STOPPED)
thread = lldbutil.get_stopped_thread(process, lldb.eStopReasonBreakpoint)
self.assertIsNotNone(thread)
frameEntered = thread.GetFrameAtIndex(0)
if self.TraceOn():
print(frameEntered)
lldbutil.print_stacktrace(thread)
self.assertTrue(frameEntered)
# Doing two step overs while still inside c().
thread.StepOver()
thread.StepOver()
self.assertTrue(thread)
frameNow = thread.GetFrameAtIndex(0)
if self.TraceOn():
print(frameNow)
lldbutil.print_stacktrace(thread)
self.assertTrue(frameNow)
# The latest two frames are considered equal.
self.assertTrue(frameEntered.IsEqual(frameNow))
# Now let's step out of frame c().
thread.StepOutOfFrame(frameNow)
frameOutOfC = thread.GetFrameAtIndex(0)
if self.TraceOn():
print(frameOutOfC)
lldbutil.print_stacktrace(thread)
self.assertTrue(frameOutOfC)
# The latest two frames should not be equal.
self.assertFalse(frameOutOfC.IsEqual(frameNow))
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