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Implement lazy decoding of DefPathTable during incremental compilation PR https://github.com/rust-lang/rust/pull/75813 implemented lazy decoding of the `DefPathTable` from crate metadata. However, it requires decoding the entire `DefPathTable` when incremental compilation is active, so that we can map a decoded `DefPathHash` to a `DefId` from an arbitrary crate. This PR adds support for lazy decoding of dependency `DefPathTable`s when incremental compilation si active. When we load the incremental cache and dep graph, we need the ability to map a `DefPathHash` to a `DefId` in the current compilation session (if the corresponding definition still exists). This is accomplished by storing the old `DefId` (that is, the `DefId` from the previous compilation session) for each `DefPathHash` we need to remap. Since a `DefPathHash` includes the owning crate, the old crate is guaranteed to be the right one (if the definition still exists). We then use the old `DefIndex` as an initial guess, which we validate by comparing the expected and actual `DefPathHash`es. In most cases, foreign crates will be completely unchanged, which means that we our guess will be correct. If our guess is wrong, we fall back to decoding the entire `DefPathTable` for the foreign crate. This still represents an improvement over the status quo, since we can skip decoding the entire `DefPathTable` for other crates (where all of our guesses were correct). |
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| .. | ||
| rustc | ||
| rustc_apfloat | ||
| rustc_arena | ||
| rustc_ast | ||
| rustc_ast_lowering | ||
| rustc_ast_passes | ||
| rustc_ast_pretty | ||
| rustc_attr | ||
| rustc_builtin_macros | ||
| rustc_codegen_cranelift | ||
| rustc_codegen_llvm | ||
| rustc_codegen_ssa | ||
| rustc_data_structures | ||
| rustc_driver | ||
| rustc_error_codes | ||
| rustc_errors | ||
| rustc_expand | ||
| rustc_feature | ||
| rustc_fs_util | ||
| rustc_graphviz | ||
| rustc_hir | ||
| rustc_hir_pretty | ||
| rustc_incremental | ||
| rustc_index | ||
| rustc_infer | ||
| rustc_interface | ||
| rustc_lexer | ||
| rustc_lint | ||
| rustc_lint_defs | ||
| rustc_llvm | ||
| rustc_macros | ||
| rustc_metadata | ||
| rustc_middle | ||
| rustc_mir | ||
| rustc_mir_build | ||
| rustc_parse | ||
| rustc_parse_format | ||
| rustc_passes | ||
| rustc_plugin_impl | ||
| rustc_privacy | ||
| rustc_query_system | ||
| rustc_resolve | ||
| rustc_save_analysis | ||
| rustc_serialize | ||
| rustc_session | ||
| rustc_span | ||
| rustc_symbol_mangling | ||
| rustc_target | ||
| rustc_trait_selection | ||
| rustc_traits | ||
| rustc_ty_utils | ||
| rustc_typeck | ||