1"""
2Check that missing module source files are correctly handled by LLDB.
3"""
4
5from lldbsuite.test.decorators import *
6from lldbsuite.test.lldbtest import *
7from lldbsuite.test import lldbutil
8import os
9import shutil
10
11
12class TestCase(TestBase):
13
14    # We only emulate a fake libc++ in this test and don't use the real libc++,
15    # but we still add the libc++ category so that this test is only run in
16    # test configurations where libc++ is actually supposed to be tested.
17    @add_test_categories(["libc++"])
18    @skipIf(compiler=no_match("clang"))
19    @skipIfRemote
20    def test(self):
21        # The path to our temporary target root that contains the temporary
22        # module sources.
23        target_sysroot = self.getBuildArtifact("root")
24
25        # Copy the sources to the root.
26        shutil.copytree(self.getSourcePath("root"), target_sysroot)
27        # Build the binary with the copied sources.
28        self.build()
29        # Delete the copied sources so that they are now unavailable.
30        shutil.rmtree(target_sysroot)
31
32        # Set the sysroot where our dummy libc++ used to exist. Just to make
33        # sure we don't find some existing headers on the system that could
34        # XPASS this test.
35        self.runCmd("platform select --sysroot '" + target_sysroot + "' host")
36
37        lldbutil.run_to_source_breakpoint(self,
38                                          "// Set break point at this line.",
39                                          lldb.SBFileSpec("main.cpp"))
40
41        # Import the std C++ module and run an expression.
42        # As we deleted the sources, LLDB should refuse the load the module
43        # and just print the normal error we get from the expression.
44        self.runCmd("settings set target.import-std-module true")
45        self.expect("expr v.unknown_identifier", error=True,
46                    substrs=["no member named 'unknown_identifier'"])
47        # Check that there is no confusing error about failing to build the
48        # module.
49        self.expect("expr v.unknown_identifier", error=True, matching=False,
50                    substrs=["could not build module 'std'"])
51
52        # Test the fallback mode. It should also just print the normal
53        # error but not mention a failed module build.
54        self.runCmd("settings set target.import-std-module fallback")
55
56        self.expect("expr v.unknown_identifier", error=True,
57                     substrs=["no member named 'unknown_identifier'"])
58        self.expect("expr v.unknown_identifier", error=True, matching=False,
59                    substrs=["could not build module 'std'"])
60