- bool doesSectionRequireSymbols(const MCSection &Section) const override {
- // Temporary labels in the string literals sections require symbols. The
- // issue is that the x86_64 relocation format does not allow symbol +
- // offset, and so the linker does not have enough information to resolve the
- // access to the appropriate atom unless an external relocation is used. For
- // non-cstring sections, we expect the compiler to use a non-temporary label
- // for anything that could have an addend pointing outside the symbol.
- //
- // See <rdar://problem/4765733>.
- const MCSectionMachO &SMO = static_cast<const MCSectionMachO&>(Section);
- return SMO.getType() == MachO::S_CSTRING_LITERALS;
- }
-
- bool isSectionAtomizable(const MCSection &Section) const override {
- const MCSectionMachO &SMO = static_cast<const MCSectionMachO&>(Section);
- // Fixed sized data sections are uniqued, they cannot be diced into atoms.
- switch (SMO.getType()) {
- default:
- return true;
-
- case MachO::S_4BYTE_LITERALS:
- case MachO::S_8BYTE_LITERALS:
- case MachO::S_16BYTE_LITERALS:
- case MachO::S_LITERAL_POINTERS:
- case MachO::S_NON_LAZY_SYMBOL_POINTERS:
- case MachO::S_LAZY_SYMBOL_POINTERS:
- case MachO::S_MOD_INIT_FUNC_POINTERS:
- case MachO::S_MOD_TERM_FUNC_POINTERS:
- case MachO::S_INTERPOSING:
- return false;
- }
- }
-