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"""
Test SBValue API linked_list_iter which treats the SBValue as a linked list and
supports iteration till the end of list is reached.
"""
from __future__ import print_function
import os, time
import re
import lldb
import lldbsuite.test.lldbutil as lldbutil
from lldbsuite.test.lldbtest import *
class ValueAsLinkedListTestCase(TestBase):
mydir = TestBase.compute_mydir(__file__)
def setUp(self):
# Call super's setUp().
TestBase.setUp(self)
# We'll use the test method name as the exe_name.
self.exe_name = self.testMethodName
# Find the line number to break at.
self.line = line_number('main.cpp', '// Break at this line')
@add_test_categories(['pyapi'])
def test(self):
"""Exercise SBValue API linked_list_iter."""
d = {'EXE': self.exe_name}
self.build(dictionary=d)
self.setTearDownCleanup(dictionary=d)
exe = os.path.join(os.getcwd(), self.exe_name)
# Create a target by the debugger.
target = self.dbg.CreateTarget(exe)
self.assertTrue(target, VALID_TARGET)
# Create the breakpoint inside function 'main'.
breakpoint = target.BreakpointCreateByLocation('main.cpp', self.line)
self.assertTrue(breakpoint, VALID_BREAKPOINT)
# Now launch the process, and do not stop at entry point.
process = target.LaunchSimple (None, None, self.get_process_working_directory())
self.assertTrue(process, PROCESS_IS_VALID)
# Get Frame #0.
self.assertTrue(process.GetState() == lldb.eStateStopped)
thread = lldbutil.get_stopped_thread(process, lldb.eStopReasonBreakpoint)
self.assertTrue(thread.IsValid(), "There should be a thread stopped due to breakpoint condition")
frame0 = thread.GetFrameAtIndex(0)
# Get variable 'task_head'.
task_head = frame0.FindVariable('task_head')
self.assertTrue(task_head, VALID_VARIABLE)
self.DebugSBValue(task_head)
# By design (see main.cpp), the visited id's are: [1, 2, 4, 5].
visitedIDs = [1, 2, 4, 5]
list = []
cvf = lldbutil.ChildVisitingFormatter(indent_child=2)
for t in task_head.linked_list_iter('next'):
self.assertTrue(t, VALID_VARIABLE)
# Make sure that 'next' corresponds to an SBValue with pointer type.
self.assertTrue(t.TypeIsPointerType())
if self.TraceOn():
print(cvf.format(t))
list.append(int(t.GetChildMemberWithName("id").GetValue()))
# Sanity checks that the we visited all the items (no more, no less).
if self.TraceOn():
print("visited IDs:", list)
self.assertTrue(visitedIDs == list)
# Let's exercise the linked_list_iter() API again, this time supplying
# our end of list test function.
def eol(val):
"""Test function to determine end of list."""
# End of list is reached if either the value object is invalid
# or it corresponds to a null pointer.
if not val or int(val.GetValue(), 16) == 0:
return True
# Also check the "id" for correct semantics. If id <= 0, the item
# is corrupted, let's return True to signify end of list.
if int(val.GetChildMemberWithName("id").GetValue(), 0) <= 0:
return True
# Otherwise, return False.
return False
list = []
for t in task_head.linked_list_iter('next', eol):
self.assertTrue(t, VALID_VARIABLE)
# Make sure that 'next' corresponds to an SBValue with pointer type.
self.assertTrue(t.TypeIsPointerType())
if self.TraceOn():
print(cvf.format(t))
list.append(int(t.GetChildMemberWithName("id").GetValue()))
# Sanity checks that the we visited all the items (no more, no less).
if self.TraceOn():
print("visited IDs:", list)
self.assertTrue(visitedIDs == list)
# Get variable 'empty_task_head'.
empty_task_head = frame0.FindVariable('empty_task_head')
self.assertTrue(empty_task_head, VALID_VARIABLE)
self.DebugSBValue(empty_task_head)
list = []
# There is no iterable item from empty_task_head.linked_list_iter().
for t in empty_task_head.linked_list_iter('next', eol):
if self.TraceOn():
print(cvf.format(t))
list.append(int(t.GetChildMemberWithName("id").GetValue()))
self.assertTrue(len(list) == 0)
# Get variable 'task_evil'.
task_evil = frame0.FindVariable('task_evil')
self.assertTrue(task_evil, VALID_VARIABLE)
self.DebugSBValue(task_evil)
list = []
# There 3 iterable items from task_evil.linked_list_iter(). :-)
for t in task_evil.linked_list_iter('next'):
if self.TraceOn():
print(cvf.format(t))
list.append(int(t.GetChildMemberWithName("id").GetValue()))
self.assertTrue(len(list) == 3)
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