forked from Imagelibrary/binutils-gdb
5b75b03006
The dwarf2_per_cu_data type is going to become objfile-independent, while the dwarf2_cu type will stay object-dependent. This patch removes the backlink from dwarf2_per_cu_data to dwarf2_cu, in favor of the dwarf2_per_objfile::m_dwarf2_cus map. It maps dwarf2_per_cu_data objects to the corresponding dwarf2_cu objects for this objfile. If a CU has been read in in the context of this objfile, then an entry will be present in the map. The dwarf2_cu objects that are read in are currently kept in a linked list rooted in the dwarf2_per_bfd. Except that the dwarf2_cu objects are not simply linked together, they are interleaved with their corresponding dwarf2_per_cu_data objects. So if we have CUs A and B read in, the dwarf2_per_bfd::read_in_chain will point to a chain like this (DPCD == dwarf2_per_cu_data, DC == dwarf2_cu): DPCD A -> DC A -> DPCD B -> DC B Obviously, this can't stay as is, since a same CU can be read in for an objfile but not read in for another objfile sharing the same BFD, and the dwarf2_per_cu_data::cu link is removed. This is all replaced by the dwarf2_per_objfile::m_dwarf2_cus map. gdb/ChangeLog: * dwarf2/read.h (struct dwarf2_cu): Forward-declare. (struct dwarf2_per_bfd) <free_cached_comp_units>: Remove, move to dwarf2_per_objfile. <read_in_chain>: Remove. (struct dwarf2_per_objfile) <get_cu, set_cu, remove_cu, remove_all_cus, age_comp_units>: New methods. <m_dwarf2_cus>: New member. (struct dwarf2_per_cu_data) <cu>: Remove. * dwarf2/read.c (struct dwarf2_cu) <read_in_chain>: Remove. (age_cached_comp_units, free_one_cached_comp_unit): Remove, moved to methods of dwarf2_per_objfile. (dwarf2_clear_marks): Remove. (dwarf2_queue_item::~dwarf2_queue_item): Update. (dwarf2_per_bfd::~dwarf2_per_bfd): Don't free dwarf2_cus. (dwarf2_per_bfd::free_cached_comp_units): Remove. (dwarf2_per_objfile::remove_all_cus): New. (class free_cached_comp_units) <~free_cached_comp_units>: Update. (load_cu): Update. (dw2_do_instantiate_symtab): Adjust. (fill_in_sig_entry_from_dwo_entry): Adjust. (cutu_reader::init_tu_and_read_dwo_dies): Update. (cutu_reader::cutu_reader): Likewise. (cutu_reader::keep): Use dwarf2_per_objfile::set_cu. (cutu_reader::cutu_reader): Use dwarf2_per_objfile::get_cu. (process_psymtab_comp_unit): Use dwarf2_per_objfile::remove_cu and dwarf2_per_objfile::age_comp_units. (load_partial_comp_unit): Update. (maybe_queue_comp_unit): Use dwarf2_per_objfile::get_cu. (process_queue): Likewise. (find_partial_die): Use dwarf2_per_objfile::get_cu instead of cu backlink. (dwarf2_read_addr_index): Likewise. (follow_die_offset): Likewise. (dwarf2_fetch_die_loc_sect_off): Likewise. (dwarf2_fetch_constant_bytes): Likewise. (dwarf2_fetch_die_type_sect_off): Likewise. (follow_die_sig_1): Likewise. (load_full_type_unit): Likewise. (read_signatured_type): Likewise. (dwarf2_cu::dwarf2_cu): Don't set cu field. (dwarf2_cu::~dwarf2_cu): Remove. (dwarf2_per_objfile::get_cu): New. (dwarf2_per_objfile::set_cu): New. (age_cached_comp_units): Rename to... (dwarf2_per_objfile::age_comp_units): ... this. Adjust to std::unordered_map. (free_one_cached_comp_unit): Rename to... (dwarf2_per_objfile::remove_cu): ... this. Adjust to std::unordered_map. (dwarf2_per_objfile::~dwarf2_per_objfile): New. (dwarf2_mark_helper): Use dwarf2_per_objfile::get_cu, expect a dwarf2_per_objfile in data. (dwarf2_mark): Pass dwarf2_per_objfile in data to htab_traverse. (dwarf2_clear_marks): Remove.
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