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"""
Test the MemoryCache L1 flush.
"""
from __future__ import print_function
import lldb
from lldbsuite.test.decorators import *
from lldbsuite.test.lldbtest import *
import lldbsuite.test.lldbutil as lldbutil
class MemoryCacheTestCase(TestBase):
mydir = TestBase.compute_mydir(__file__)
def setUp(self):
# Call super's setUp().
TestBase.setUp(self)
# Find the line number to break inside main().
self.line = line_number('main.cpp', '// Set break point at this line.')
@skipIfWindows # This is flakey on Windows: llvm.org/pr38373
def test_memory_cache(self):
"""Test the MemoryCache class with a sequence of 'memory read' and 'memory write' operations."""
self.build()
exe = self.getBuildArtifact("a.out")
self.runCmd("file " + exe, CURRENT_EXECUTABLE_SET)
# Break in main() after the variables are assigned values.
lldbutil.run_break_set_by_file_and_line(
self, "main.cpp", self.line, num_expected_locations=1, loc_exact=True)
self.runCmd("run", RUN_SUCCEEDED)
# The stop reason of the thread should be breakpoint.
self.expect("thread list", STOPPED_DUE_TO_BREAKPOINT,
substrs=['stopped', 'stop reason = breakpoint'])
# The breakpoint should have a hit count of 1.
self.expect("breakpoint list -f", BREAKPOINT_HIT_ONCE,
substrs=[' resolved, hit count = 1'])
# Read a chunk of memory containing &my_ints[0]. The number of bytes read
# must be greater than m_L2_cache_line_byte_size to make sure the L1
# cache is used.
self.runCmd('memory read -f d -c 201 `&my_ints - 100`')
# Check the value of my_ints[0] is the same as set in main.cpp.
line = self.res.GetOutput().splitlines()[100]
self.assertTrue(0x00000042 == int(line.split(':')[1], 0))
# Change the value of my_ints[0] in memory.
self.runCmd("memory write -s 4 `&my_ints` AA")
# Re-read the chunk of memory. The cache line should have been
# flushed because of the 'memory write'.
self.runCmd('memory read -f d -c 201 `&my_ints - 100`')
# Check the value of my_ints[0] have been updated correctly.
line = self.res.GetOutput().splitlines()[100]
self.assertTrue(0x000000AA == int(line.split(':')[1], 0))
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