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1acbe7573d
There are two impls of the `Encoder` trait: `opaque::Encoder` and `opaque::FileEncoder`. The former encodes into memory and is infallible, the latter writes to file and is fallible. Currently, standard `Result`/`?`/`unwrap` error handling is used, but this is a bit verbose and has non-trivial cost, which is annoying given how rare failures are (especially in the infallible `opaque::Encoder` case). This commit changes how `Encoder` fallibility is handled. All the `emit_*` methods are now infallible. `opaque::Encoder` requires no great changes for this. `opaque::FileEncoder` now implements a delayed error handling strategy. If a failure occurs, it records this via the `res` field, and all subsequent encoding operations are skipped if `res` indicates an error has occurred. Once encoding is complete, the new `finish` method is called, which returns a `Result`. In other words, there is now a single `Result`-producing method instead of many of them. This has very little effect on how any file errors are reported if `opaque::FileEncoder` has any failures. Much of this commit is boring mechanical changes, removing `Result` return values and `?` or `unwrap` from expressions. The more interesting parts are as follows. - serialize.rs: The `Encoder` trait gains an `Ok` associated type. The `into_inner` method is changed into `finish`, which returns `Result<Vec<u8>, !>`. - opaque.rs: The `FileEncoder` adopts the delayed error handling strategy. Its `Ok` type is a `usize`, returning the number of bytes written, replacing previous uses of `FileEncoder::position`. - Various methods that take an encoder now consume it, rather than being passed a mutable reference, e.g. `serialize_query_result_cache`. |
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| .. | ||
| rustc | ||
| rustc_apfloat | ||
| rustc_arena | ||
| rustc_ast | ||
| rustc_ast_lowering | ||
| rustc_ast_passes | ||
| rustc_ast_pretty | ||
| rustc_attr | ||
| rustc_borrowck | ||
| rustc_builtin_macros | ||
| rustc_codegen_cranelift | ||
| rustc_codegen_gcc | ||
| rustc_codegen_llvm | ||
| rustc_codegen_ssa | ||
| rustc_const_eval | ||
| rustc_data_structures | ||
| rustc_driver | ||
| rustc_error_codes | ||
| rustc_error_messages | ||
| 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_log | ||
| rustc_macros | ||
| rustc_metadata | ||
| rustc_middle | ||
| rustc_mir_build | ||
| rustc_mir_dataflow | ||
| rustc_mir_transform | ||
| rustc_monomorphize | ||
| rustc_parse | ||
| rustc_parse_format | ||
| rustc_passes | ||
| rustc_plugin_impl | ||
| rustc_privacy | ||
| rustc_query_impl | ||
| 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_type_ir | ||
| rustc_typeck | ||