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Prepare libcpp to support 64-bit location_t, without yet making any functional changes, by adding new typedefs that enable code to be written such that it works with any size location_t. Update the usage of line maps within libcpp accordingly. Subsequent patches will prepare the rest of the codebase similarly, and then afterwards, location_t will be changed to uint64_t. libcpp/ChangeLog: * include/line-map.h (line_map_uint_t): New typedef, the same type as location_t. (location_diff_t): New typedef. (line_map_suggested_range_bits): New constant. (struct maps_info_ordinary): Change member types from "unsigned int" to "line_map_uint_t". (struct maps_info_macro): Likewise. (struct location_adhoc_data_map): Likewise. (LINEMAPS_ALLOCATED): Change return type from "unsigned int" to "line_map_uint_t". (LINEMAPS_ORDINARY_ALLOCATED): Likewise. (LINEMAPS_MACRO_ALLOCATED): Likewise. (LINEMAPS_USED): Likewise. (LINEMAPS_ORDINARY_USED): Likewise. (LINEMAPS_MACRO_USED): Likewise. (linemap_lookup_macro_index): Likewise. (LINEMAPS_MAP_AT): Change argument type from "unsigned int" to "line_map_uint_t". (LINEMAPS_ORDINARY_MAP_AT): Likewise. (LINEMAPS_MACRO_MAP_AT): Likewise. (line_map_new_raw): Likewise. (linemap_module_restore): Likewise. (linemap_dump): Likewise. (line_table_dump): Likewise. (LINEMAPS_LAST_MAP): Add a linemap_assert() for safety. (SOURCE_COLUMN): Use a cast to ensure correctness if location_t becomes a 64-bit type. * line-map.cc (location_adhoc_data_hash): Don't truncate to 32-bit prematurely when hashing. (line_maps::get_or_create_combined_loc): Adapt types to support potentially 64-bit location_t. Use MAX_LOCATION_T rather than a hard-coded constant. (line_maps::get_range_from_loc): Adapt types and constants to support potentially 64-bit location_t. (line_maps::pure_location_p): Likewise. (line_maps::get_pure_location): Likewise. (line_map_new_raw): Likewise. (LAST_SOURCE_LINE_LOCATION): Likewise. (linemap_add): Likewise. (linemap_module_restore): Likewise. (linemap_line_start): Likewise. (linemap_position_for_column): Likewise. (linemap_position_for_line_and_column): Likewise. (linemap_position_for_loc_and_offset): Likewise. (linemap_ordinary_map_lookup): Likewise. (linemap_lookup_macro_index): Likewise. (linemap_dump): Likewise. (linemap_dump_location): Likewise. (linemap_get_file_highest_location): Likewise. (line_table_dump): Likewise. (linemap_compare_locations): Avoid signed int overflow in the result. * macro.cc (num_expanded_macros_counter): Change type of global variable from "unsigned int" to "line_map_uint_t". (num_macro_tokens_counter): Likewise.
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