657672667f
**Summary** After this patch, `DW_TAG_imported_declaration`s will be emitted into the DWARF accelerator tables (under `.apple_namespaces`) **Motivation** Currently LLDB expression evaluation doesn't see through namespace aliases. This is because LLDB only considers namespaces that are part of `.apple_namespaces` when building a nested namespace identifier for C++, which currently doesn't include import declarations. The alternative to putting imports into accelerator tables is to do a linear scan of a `DW_TAG_namespace` and look for import declarations that look like they would satisfy the lookup request, which is prohibitively expensive. **Testing** * Added unit-test Differential Revision: https://reviews.llvm.org/D143397
16 lines
276 B
C++
16 lines
276 B
C++
// Compiled on MacOS using:
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// clang++ -c -std=c++2a -gdwarf-4 -O0 -o accel-imported-declaration.macho-arm64.o
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namespace A {
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namespace B {
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namespace C {
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int a = -1;
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} // namespace C
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} // namespace B
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namespace C = B::C;
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using namespace B::C;
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using B::C::a;
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} // namespace A
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