60eb06be6d
Currently funciton lookup in the expression evaluator fails to disambiguate member functions the are overloaded on lvalue/rvalue reference-qualifiers. This happens because we unconditionally set a `FunctionPrototype`s `ExtProtoInfo::RefQualifier` to `RQ_None`. We lose the ref-qualifiers in the synthesized AST and `clang::Sema` fails to pick a correct overload candidate. DWARF emits information about a function's ref-qualifiers in the form of a boolean `DW_AT_rvalue_reference` (for rvalues) and `DW_AT_reference` (for lvalues). This patch sets the `FunctionPrototype::ExtProtoInfo::RefQualifier` based on the DWARF attributes above. **Testing** * Added API test llvm/llvm-project issue #57866 Differential Revision: https://reviews.llvm.org/D134661
40 lines
1.4 KiB
Python
40 lines
1.4 KiB
Python
"""
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Tests that C++ expression evaluation can
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disambiguate between rvalue and lvalue
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reference-qualified functions.
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"""
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import lldb
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from lldbsuite.test.decorators import *
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from lldbsuite.test.lldbtest import *
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from lldbsuite.test import lldbutil
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class TestCase(TestBase):
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def test(self):
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self.build()
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lldbutil.run_to_source_breakpoint(self, "Break here", lldb.SBFileSpec("main.cpp"))
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# const lvalue
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self.expect_expr("const_foo.func()", result_type="uint32_t", result_value="0")
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# const rvalue
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self.expect_expr("static_cast<Foo const&&>(Foo{}).func()",
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result_type="int64_t", result_value="1")
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# non-const lvalue
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self.expect_expr("foo.func()", result_type="uint32_t", result_value="2")
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# non-const rvalue
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self.expect_expr("Foo{}.func()", result_type="int64_t", result_value="3")
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self.filecheck("target modules dump ast", __file__)
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# CHECK: |-CXXMethodDecl {{.*}} func 'uint32_t () const &'
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# CHECK-NEXT: | `-AsmLabelAttr {{.*}}
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# CHECK-NEXT: |-CXXMethodDecl {{.*}} func 'int64_t () const &&'
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# CHECK-NEXT: | `-AsmLabelAttr {{.*}}
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# CHECK-NEXT: |-CXXMethodDecl {{.*}} func 'uint32_t () &'
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# CHECK-NEXT: | `-AsmLabelAttr {{.*}}
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# CHECK-NEXT: `-CXXMethodDecl {{.*}} func 'int64_t () &&'
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# CHECK-NEXT: `-AsmLabelAttr {{.*}}
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