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from lldbsuite.test.decorators import *
from lldbsuite.test.lldbtest import *
from lldbsuite.test import lldbutil
class TestCase(TestBase):
@add_test_categories(["libc++"])
@skipIf(compiler=no_match("clang"))
def test(self):
self.build()
lldbutil.run_to_source_breakpoint(
self, "// Set break point at this line.", lldb.SBFileSpec("main.cpp")
)
if self.expectedCompiler(["clang"]) and self.expectedCompilerVersion(
[">", "16.0"]
):
vec_type = "std::vector<int>"
else:
vec_type = "std::vector<int, std::allocator<int> >"
# Test printing the vector before enabling any C++ module setting.
self.expect_expr("a", result_type=vec_type)
# Set loading the import-std-module to 'fallback' which loads the module
# and retries when an expression fails to parse.
self.runCmd("settings set target.import-std-module fallback")
# Printing the vector still works. This should return the same type
# as before as this shouldn't use a C++ module type.
self.expect_expr("a", result_type=vec_type)
# This expression can only parse with a C++ module. LLDB should
# automatically fall back to import the C++ module to get this working.
self.expect_expr("std::max<std::size_t>(0U, a.size())", result_value="3")
# The 'a' and 'local' part can be parsed without loading a C++ module and will
# load type/runtime information. The 'std::max...' part will fail to
# parse without a C++ module. Make sure we reset all the relevant parts of
# the C++ parser so that we don't end up with for example a second
# definition of 'local' when retrying.
self.expect_expr(
"a; local; std::max<std::size_t>(0U, a.size())", result_value="3"
)
# Try to declare top-level declarations that require a C++ module to parse.
# Top-level expressions don't support importing the C++ module (yet), so
# this should still fail as before.
self.expect(
"expr --top-level -- int i = std::max(1, 2);",
error=True,
substrs=["no member named 'max' in namespace 'std'"],
)
# The proper diagnostic however should be shown on the retry.
self.expect(
"expr std::max(1, 2); unknown_identifier",
error=True,
substrs=["use of undeclared identifier 'unknown_identifier'"],
)
# Turn on the 'import-std-module' setting and make sure we import the
# C++ module.
self.runCmd("settings set target.import-std-module true")
# This is still expected to work.
self.expect_expr("std::max<std::size_t>(0U, a.size())", result_value="3")
# Turn of the 'import-std-module' setting and make sure we don't load
# the module (which should prevent parsing the expression involving
# 'std::max').
self.runCmd("settings set target.import-std-module false")
self.expect(
"expr std::max(1, 2);",
error=True,
substrs=["no member named 'max' in namespace 'std'"],
)
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