1"""
2Test the MemoryCache L1 flush.
3"""
4
5
6
7import lldb
8from lldbsuite.test.decorators import *
9from lldbsuite.test.lldbtest import *
10import lldbsuite.test.lldbutil as lldbutil
11
12
13class MemoryCacheTestCase(TestBase):
14
15    def setUp(self):
16        # Call super's setUp().
17        TestBase.setUp(self)
18        # Find the line number to break inside main().
19        self.line = line_number('main.cpp', '// Set break point at this line.')
20
21    @skipIfWindows # This is flakey on Windows: llvm.org/pr38373
22    def test_memory_cache(self):
23        """Test the MemoryCache class with a sequence of 'memory read' and 'memory write' operations."""
24        self.build()
25        exe = self.getBuildArtifact("a.out")
26        self.runCmd("file " + exe, CURRENT_EXECUTABLE_SET)
27
28        # Break in main() after the variables are assigned values.
29        lldbutil.run_break_set_by_file_and_line(
30            self, "main.cpp", self.line, num_expected_locations=1, loc_exact=True)
31
32        self.runCmd("run", RUN_SUCCEEDED)
33
34        # The stop reason of the thread should be breakpoint.
35        self.expect("thread list", STOPPED_DUE_TO_BREAKPOINT,
36                    substrs=['stopped', 'stop reason = breakpoint'])
37
38        # The breakpoint should have a hit count of 1.
39        lldbutil.check_breakpoint(self, bpno = 1, expected_hit_count = 1)
40
41        # Read a chunk of memory containing &my_ints[0]. The number of bytes read
42        # must be greater than m_L2_cache_line_byte_size to make sure the L1
43        # cache is used.
44        self.runCmd('memory read -f d -c 201 `&my_ints - 100`')
45
46        # Check the value of my_ints[0] is the same as set in main.cpp.
47        line = self.res.GetOutput().splitlines()[100]
48        self.assertEquals(0x00000042, int(line.split(':')[1], 0))
49
50        # Change the value of my_ints[0] in memory.
51        self.runCmd("memory write -s 4 `&my_ints` AA")
52
53        # Re-read the chunk of memory. The cache line should have been
54        # flushed because of the 'memory write'.
55        self.runCmd('memory read -f d -c 201 `&my_ints - 100`')
56
57        # Check the value of my_ints[0] have been updated correctly.
58        line = self.res.GetOutput().splitlines()[100]
59        self.assertEquals(0x000000AA, int(line.split(':')[1], 0))
60