Commit Graph

21 Commits

Author SHA1 Message Date
Arlie Davis
1a5b9b037e ./x.py fmt 2020-12-13 13:36:01 -08:00
Arlie Davis
201a833eef Improve error handling in symbols proc-macro
This improves how the `symbols` proc-macro handles errors.
If it finds an error in its input, the macro does not panic.
Instead, it still produces an output token stream. That token
stream will contain `compile_error!(...)` macro invocations.
This will still cause compilation to fail (which is what we want),
but it will prevent meaningless errors caused by the output not
containing symbols that the macro normally generates.

This solves a small (but annoying) problem. When you're editing
rustc_span/src/symbol.rs, and you get something wrong (dup
symbol name, misordered symbol), you want to get only the errors
that are relevant, not a burst of errors that are irrelevant.
This change also uses the correct Span when reporting errors,
so you get errors that point to the correct place in
rustc_span/src/symbol.rs where something is wrong.

This also adds several unit tests which test the `symbols` proc-macro.

This commit also makes it easy to run the `symbols` proc-macro
as an ordinary Cargo test. Just run `cargo test`. This makes it
easier to do development on the macro itself, such as running it
under a debugger.

This commit also uses the `Punctuated` type in `syn` for parsing
comma-separated lists, rather than doing it manually.

The output of the macro is not changed at all by this commit,
so rustc should be completely unchanged. This just improves
quality of life during development.
2020-12-12 15:29:12 -08:00
Aaron Hill
d00ed01876
Only create OnDiskCache in incremental compilation mode
This lets us skip doing useless work when we're not in incremental
compilation mode.
2020-11-19 15:50:55 -05:00
bors
e0ef0fc392 Auto merge of #78779 - LeSeulArtichaut:ty-visitor-return, r=oli-obk
Introduce `TypeVisitor::BreakTy`

Implements MCP rust-lang/compiler-team#383.
r? `@ghost`
cc `@lcnr` `@oli-obk`

~~Blocked on FCP in rust-lang/compiler-team#383.~~
2020-11-17 12:24:34 +00:00
Bastian Kauschke
2bf93bd852 compiler: fold by value 2020-11-16 22:34:57 +01:00
LeSeulArtichaut
e0f3119103 Introduce TypeVisitor::BreakTy 2020-11-14 20:25:27 +01:00
LeSeulArtichaut
087a9340d5 Small cleanup in TypeFoldable derive macro 2020-11-07 18:20:42 +01:00
LeSeulArtichaut
9433eb83fe Remove implicit Continue type 2020-10-30 12:27:47 +01:00
LeSeulArtichaut
2c85b6fae0 TypeVisitor: use std::ops::ControlFlow instead of bool 2020-10-30 12:25:24 +01:00
Camille GILLOT
57ba8edb9e Retire rustc_dep_node_try_load_from_on_disk_cache. 2020-10-22 23:04:46 +02:00
Camille GILLOT
e853cc0b28 Retire rustc_dep_node_force. 2020-10-22 22:57:19 +02:00
Camille GILLOT
de7da7fd3d Unify query name and node name. 2020-10-22 22:49:04 +02:00
Camille GILLOT
de763701e1 Remove unused category from macros. 2020-10-22 22:43:38 +02:00
Bastian Kauschke
8752a560b9 Lift: take self by value 2020-10-21 23:59:35 +02:00
est31
12187b7f86 Remove unused #[allow(...)] statements from compiler/ 2020-09-26 01:25:55 +02:00
Joshua Nelson
2f1bfd6399 Preserve doc-comments when generating queries
This also changes some comments into doc-comments.
2020-09-17 00:28:31 -04:00
jumbatm
8b392505ae Fix non-determinism in generated format string. 2020-09-09 21:23:25 +10:00
bors
71569e4201 Auto merge of #75138 - jumbatm:session-diagnostic-derive, r=oli-obk
Add derive macro for specifying diagnostics using attributes.

Introduces `#[derive(SessionDiagnostic)]`, a derive macro for specifying structs that can be converted to Diagnostics using directions given by attributes on the struct and its fields. Currently, the following attributes have been implemented:
- `#[code = "..."]` -- this sets the Diagnostic's error code, and must be provided on the struct iself (ie, not on a field). Equivalent to calling `code`.
- `#[message = "..."]` -- this sets the Diagnostic's primary error message.
- `#[label = "..."]` -- this must be applied to fields of type `Span`, and is equivalent to `span_label`
- `#[suggestion(..)]` -- this allows a suggestion message to be supplied. This attribute must be applied to a field of type `Span` or `(Span, Applicability)`, and is equivalent to calling `span_suggestion`. Valid arguments are:
    - `message = "..."` -- this sets the suggestion message.
    - (Optional) `code = "..."` -- this suggests code for the suggestion. Defaults to empty.

`suggestion`also  comes with other variants: `#[suggestion_short(..)]`, `#[suggestion_hidden(..)]` and `#[suggestion_verbose(..)]` which all take the same keys.

Within the strings passed to each attribute, fields can be referenced without needing to be passed explicitly into the format string -- eg, `#[error = "{ident} already declared"] ` will set the error message to `format!("{} already declared", &self.ident)`. Any fields on the struct can be referenced in this way.

Additionally, for any of these attributes, Option fields can be used to only optionally apply the decoration -- for example:

```rust
#[derive(SessionDiagnostic)]
#[code = "E0123"]
struct SomeKindOfError {
    ...
    #[suggestion(message = "informative error message")]
    opt_sugg: Option<(Span, Applicability)>
    ...
}
```
will not emit a suggestion if `opt_sugg` is `None`.

We plan on iterating on this macro further; this PR is a start.

Closes #61132.

r? `@oli-obk`
2020-09-08 00:58:43 +00:00
Dan Aloni
07e7823c01 pretty: trim paths of unique symbols
If a symbol name can only be imported from one place for a type, and
as long as it was not glob-imported anywhere in the current crate, we
can trim its printed path and print only the name.

This has wide implications on error messages with types, for example,
shortening `std::vec::Vec` to just `Vec`, as long as there is no other
`Vec` importable anywhere.

This adds a new '-Z trim-diagnostic-paths=false' option to control this
feature.

On the good path, with no diagnosis printed, we should try to avoid
issuing this query, so we need to prevent trimmed_def_paths query on
several cases.

This change also relies on a previous commit that differentiates
between `Debug` and `Display` on various rustc types, where the latter
is trimmed and presented to the user and the former is not.
2020-09-02 22:26:37 +03:00
jumbatm
93eaf15646 Add SessionDiagnostic derive macro.
Co-authored-by: Oliver Scherer <github35764891676564198441@oli-obk.de>
2020-09-01 22:02:45 +10:00
mark
9e5f7d5631 mv compiler to compiler/ 2020-08-30 18:45:07 +03:00