38f8fcea34
This patch attempts to decouple C++ expression evaluation from Objective-C support. We've previously enabled it by default (if a runtime existed), but that meant we're opting into extra work we only need to do for Objective-C, which complicates/slows down C++ expression evaluation. Of course there's a valid use-case for this, which is calling Objective-C APIs when stopped in C++ frames (which Objective-C++ developers might want to do). In those cases we should really prompt the user to add the `expr --language objc++` flag. To accomodate a likely frequent use-case where a user breaks in a system C++ library (without debug-symbols) but their application is actually an Objective-C app, we allow Objective-C support in C++ expressions if the current frame doesn't have debug-info. This fixes https://github.com/llvm/llvm-project/issues/75443 and allows us to add more `LangOpts.ObjC` guards around the expression evaluator in the future (e.g., we could avoid looking into the Objective-C runtime during C++ expression evaluation, which we currently do unconditionally). Depends on https://github.com/llvm/llvm-project/pull/87657
88 lines
2.9 KiB
Python
88 lines
2.9 KiB
Python
"""
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Test expression command options.
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Test cases:
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o test_expr_options:
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Test expression command options.
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"""
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import lldb
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import lldbsuite.test.lldbutil as lldbutil
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from lldbsuite.test.decorators import *
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from lldbsuite.test.lldbtest import *
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class ExprOptionsTestCase(TestBase):
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def setUp(self):
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# Call super's setUp().
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TestBase.setUp(self)
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self.main_source = "main.cpp"
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self.main_source_spec = lldb.SBFileSpec(self.main_source)
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self.line = line_number("main.cpp", "// breakpoint_in_main")
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self.exe = self.getBuildArtifact("a.out")
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def test_expr_options(self):
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"""These expression command options should work as expected."""
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self.build()
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# Set debugger into synchronous mode
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self.dbg.SetAsync(False)
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(target, process, thread, bkpt) = lldbutil.run_to_source_breakpoint(
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self, "// breakpoint_in_main", self.main_source_spec
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)
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frame = thread.GetFrameAtIndex(0)
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options = lldb.SBExpressionOptions()
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# test --language on C++ expression using the SB API's
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# Make sure we can evaluate a C++11 expression.
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val = frame.EvaluateExpression("foo != nullptr")
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self.assertTrue(val.IsValid())
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self.assertSuccess(val.GetError())
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self.DebugSBValue(val)
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# Make sure it still works if language is set to C++11:
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options.SetLanguage(lldb.eLanguageTypeC_plus_plus_11)
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val = frame.EvaluateExpression("foo != nullptr", options)
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self.assertTrue(val.IsValid())
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self.assertSuccess(val.GetError())
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self.DebugSBValue(val)
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# Make sure it fails if language is set to C:
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options.SetLanguage(lldb.eLanguageTypeC)
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val = frame.EvaluateExpression("foo != nullptr", options)
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self.assertTrue(val.IsValid())
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self.assertFalse(val.GetError().Success())
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def test_expr_options_lang(self):
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"""These expression language options should work as expected."""
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self.build()
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# Set debugger into synchronous mode
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self.dbg.SetAsync(False)
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(target, process, thread, bkpt) = lldbutil.run_to_source_breakpoint(
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self, "// breakpoint_in_main", self.main_source_spec
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)
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frame = thread.GetFrameAtIndex(0)
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options = lldb.SBExpressionOptions()
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# Make sure we can retrieve `id` variable if language is set to C++11:
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options.SetLanguage(lldb.eLanguageTypeC_plus_plus_11)
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val = frame.EvaluateExpression("id == 0", options)
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self.assertTrue(val.IsValid())
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self.assertSuccess(val.GetError())
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self.DebugSBValue(val)
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# Make sure we can't retrieve `id` variable if language is set to ObjC:
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options.SetLanguage(lldb.eLanguageTypeObjC)
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val = frame.EvaluateExpression("id == 0", options)
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self.assertTrue(val.IsValid())
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self.assertFalse(val.GetError().Success())
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