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2022-02-22Delete Decoder::read_unitMark Rousskov-11/+2
2022-02-22Provide copy-free access to raw Decoder bytesMark Rousskov-14/+7
2022-02-22Provide raw &str access from DecoderMark Rousskov-5/+4
2022-02-20Delete Decoder::read_mapMark Rousskov-37/+26
2022-02-20Delete Decoder::read_seqMark Rousskov-54/+44
2022-02-20Delete Decoder::read_enum_variantMark Rousskov-14/+5
2022-02-20Delete Decoder::read_map_elt_valMark Rousskov-11/+3
2022-02-20Delete Decoder::read_map_elt_keyMark Rousskov-11/+3
2022-02-20Delete Decoder::read_optionMark Rousskov-13/+5
2022-02-20Delete Decoder::read_seq_eltMark Rousskov-19/+8
2022-02-20Delete Decoder::read_tuple_argMark Rousskov-12/+1
2022-02-20Delete Decoder::read_tupleMark Rousskov-15/+3
2022-02-20Use count! macro in tuple length computationMark Rousskov-3/+2
2022-02-20Delete Decoder::read_struct_fieldMark Rousskov-8/+0
2022-02-20Delete Decoder::read_structMark Rousskov-8/+0
2022-02-20Delete read_enum_variant_argMark Rousskov-10/+2
2022-02-20Delete read_enum_variant namesMark Rousskov-3/+3
2022-02-20Delete Decoder::read_enumMark Rousskov-21/+8
2022-02-20Remove support for JSON deserialization to RustMark Rousskov-314/+7
This is no longer used by the compiler itself, and removing this support opens the door to massively simplifying the Decodable/Decoder API by dropping the self-describing deserialization support (necessary for JSON).
2022-02-19Adopt let else in more placesest31-3/+3
2022-02-05Drop json::from_readerMark Rousskov-22/+0
Performing UTF-8 decode outside the JSON module makes more sense in almost all cases.
2022-01-31Remove two unnecessary transmutes from opaque Encoder and Decoderbjorn3-4/+3
2022-01-22Address review comments.Nicholas Nethercote-3/+1
2022-01-22Make `Decodable` and `Decoder` infallible.Nicholas Nethercote-307/+272
`Decoder` has two impls: - opaque: this impl is already partly infallible, i.e. in some places it currently panics on failure (e.g. if the input is too short, or on a bad `Result` discriminant), and in some places it returns an error (e.g. on a bad `Option` discriminant). The number of places where either happens is surprisingly small, just because the binary representation has very little redundancy and a lot of input reading can occur even on malformed data. - json: this impl is fully fallible, but it's only used (a) for the `.rlink` file production, and there's a `FIXME` comment suggesting it should change to a binary format, and (b) in a few tests in non-fundamental ways. Indeed #85993 is open to remove it entirely. And the top-level places in the compiler that call into decoding just abort on error anyway. So the fallibility is providing little value, and getting rid of it leads to some non-trivial performance improvements. Much of this commit is pretty boring and mechanical. Some notes about a few interesting parts: - The commit removes `Decoder::{Error,error}`. - `InternIteratorElement::intern_with`: the impl for `T` now has the same optimization for small counts that the impl for `Result<T, E>` has, because it's now much hotter. - Decodable impls for SmallVec, LinkedList, VecDeque now all use `collect`, which is nice; the one for `Vec` uses unsafe code, because that gave better perf on some benchmarks.
2022-01-22Rename `Decoder::read_nil` and `read_unit`.Nicholas Nethercote-5/+5
Because `()` is called "unit" and it makes it match `Encoder::emit_unit`.
2022-01-15Auto merge of #92604 - nnethercote:optimize-impl_read_unsigned_leb128, ↵bors-17/+20
r=michaelwoerister Optimize `impl_read_unsigned_leb128` I see instruction count improvements of up to 3.5% locally with these changes, mostly on the smaller benchmarks. r? `@michaelwoerister`
2022-01-07Unpeel the first iteration of the loop in impl_read_unsigned_leb128.Nicholas Nethercote-2/+11
2022-01-07Modify the buffer position directly when reading leb128 values.Nicholas Nethercote-15/+9
It's a small but clear performance win.
2021-12-28Do not use LEB128 for encoding u16 and i16Jakub Beránek-8/+15
2021-12-13Auto merge of #91626 - klensy:json-less-alloc, r=petrochenkovbors-3/+3
rustc_serialize: don't allocate `String`s as key for `BTreeMap`, when `str` is enough
2021-12-07don't allocate strings when str is enought for using as keyklensy-3/+3
2021-12-06avoid string validation in rustc_serialize, check a marker byte insteadThe 8472-4/+17
since the serialization format isn't self-describing we need a way to detect when encoder and decoder don't match up. but that doesn't have to be utf8 validation for strings, which does cost a few % of performance. Instead we can use a marker byte at the end to be reasonably sure that we're dealing with a string and it wasn't overwritten in some way.
2021-11-22Avoid generating empty closures for fieldless enumsMark Rousskov-0/+28
For many enums, this avoids generating lots of tiny stubs that need to be codegen'd and then inlined and removed by LLVM.
2021-10-15Revert "Auto merge of #89709 - clemenswasser:apply_clippy_suggestions_2, ↵Matthias Krüger-2/+2
r=petrochenkov" The PR had some unforseen perf regressions that are not as easy to find. Revert the PR for now. This reverts commit 6ae8912a3e7d2c4c775024f58a7ba4b1aedc4073, reversing changes made to 86d6d2b7389fe1b339402c1798edae8b695fc9ef.
2021-10-10Apply clippy suggestionsClemens Wasser-2/+2
2021-09-10rustc: Remove local variable IDs from `Export`sVadim Petrochenkov-0/+12
Local variables can never be exported.
2021-08-22Fix more “a”/“an” typosFrank Steffahn-2/+2
2021-08-22Fix typos “a”→“an”Frank Steffahn-1/+1
2021-08-18Remove box syntax from rustc_serializeest31-2/+1
2021-06-17Emit warnings for unused fields in custom targets.Adam Bratschi-Kaye-0/+9
2021-06-07Auto merge of #85903 - bjorn3:rustc_serialize_cleanup, r=varkorbors-279/+73
Remove unused functions and arguments from rustc_serialize
2021-06-01Remove unused functions and arguments from rustc_serializebjorn3-279/+73
2021-05-31Remove unused feature gatesbjorn3-3/+0
2021-03-26Auto merge of #83465 - michaelwoerister:safe-read_raw_bytes, r=cjgillotbors-35/+18
Allow for reading raw bytes from rustc_serialize::Decoder without unsafe code The current `read_raw_bytes` method requires using `MaybeUninit` and `unsafe`. I don't think this is necessary. Let's see if a safe interface has any performance drawbacks. This is a followup to #83273 and will make it easier to rebase #82183. r? `@cjgillot`
2021-03-25Allow for reading raw bytes from rustc_serialize::Decoder without unsafe code.Michael Woerister-35/+18
2021-03-24Revert "Revert stabilizing integer::BITS."Mara Bos-1/+0
2021-03-19Move raw bytes handling to Encoder/Decoder.Camille GILLOT-44/+70
2021-03-18Simplify IntEncodedWithFixedSize.Camille GILLOT-13/+7
2021-03-18Move IntEncodedWithFixedSize to rustc_serialize.Camille GILLOT-0/+48
2021-02-20Update the bootstrap compilerJoshua Nelson-1/+0
Note this does not change `core::derive` since it was merged after the beta bump.
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