1from lldbsuite.test.decorators import *
2from lldbsuite.test.lldbtest import *
3from lldbsuite.test import lldbutil
4
5
6class TestCase(TestBase):
7
8    @add_test_categories(["libc++"])
9    @skipIf(compiler=no_match("clang"))
10    def test(self):
11        self.build()
12
13        lldbutil.run_to_source_breakpoint(self,
14                                          "// Set break point at this line.",
15                                          lldb.SBFileSpec("main.cpp"))
16
17        if self.expectedCompiler(["clang"]) and self.expectedCompilerVersion(['>', '16.0']):
18            vec_type = "std::vector<int>"
19        else:
20            vec_type = "std::vector<int, std::allocator<int> >"
21
22        # Test printing the vector before enabling any C++ module setting.
23        self.expect_expr("a", result_type=vec_type)
24
25        # Set loading the import-std-module to 'fallback' which loads the module
26        # and retries when an expression fails to parse.
27        self.runCmd("settings set target.import-std-module fallback")
28
29        # Printing the vector still works. This should return the same type
30        # as before as this shouldn't use a C++ module type.
31        self.expect_expr("a", result_type=vec_type)
32
33        # This expression can only parse with a C++ module. LLDB should
34        # automatically fall back to import the C++ module to get this working.
35        self.expect_expr("std::max<std::size_t>(0U, a.size())", result_value="3")
36
37
38        # The 'a' and 'local' part can be parsed without loading a C++ module and will
39        # load type/runtime information. The 'std::max...' part will fail to
40        # parse without a C++ module. Make sure we reset all the relevant parts of
41        # the C++ parser so that we don't end up with for example a second
42        # definition of 'local' when retrying.
43        self.expect_expr("a; local; std::max<std::size_t>(0U, a.size())", result_value="3")
44
45
46        # Try to declare top-level declarations that require a C++ module to parse.
47        # Top-level expressions don't support importing the C++ module (yet), so
48        # this should still fail as before.
49        self.expect("expr --top-level -- int i = std::max(1, 2);", error=True,
50                    substrs=["no member named 'max' in namespace 'std'"])
51
52        # The proper diagnostic however should be shown on the retry.
53        self.expect("expr std::max(1, 2); unknown_identifier", error=True,
54                    substrs=["use of undeclared identifier 'unknown_identifier'"])
55
56        # Turn on the 'import-std-module' setting and make sure we import the
57        # C++ module.
58        self.runCmd("settings set target.import-std-module true")
59        # This is still expected to work.
60        self.expect_expr("std::max<std::size_t>(0U, a.size())", result_value="3")
61
62        # Turn of the 'import-std-module' setting and make sure we don't load
63        # the module (which should prevent parsing the expression involving
64        # 'std::max').
65        self.runCmd("settings set target.import-std-module false")
66        self.expect("expr std::max(1, 2);", error=True,
67                    substrs=["no member named 'max' in namespace 'std'"])
68