1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160

#![feature(allow_internal_unstable)]
#![feature(if_let_guard)]
#![feature(let_chains)]
#![feature(never_type)]
#![feature(proc_macro_diagnostic)]
#![feature(proc_macro_span)]
#![feature(proc_macro_tracked_env)]
#![allow(rustc::default_hash_types)]
#![allow(internal_features)]

use synstructure::decl_derive;

use proc_macro::TokenStream;

mod current_version;
mod diagnostics;
mod extension;
mod hash_stable;
mod lift;
mod query;
mod serialize;
mod symbols;
mod type_foldable;
mod type_visitable;

// Reads the rust version (e.g. "1.75.0") from the CFG_RELEASE env var and
// produces a `RustcVersion` literal containing that version (e.g.
// `RustcVersion { major: 1, minor: 75, patch: 0 }`).
#[proc_macro]
pub fn current_rustc_version(input: TokenStream) -> TokenStream {
    current_version::current_version(input)
}

#[proc_macro]
pub fn rustc_queries(input: TokenStream) -> TokenStream {
    query::rustc_queries(input)
}

#[proc_macro]
pub fn symbols(input: TokenStream) -> TokenStream {
    symbols::symbols(input.into()).into()
}

/// Derive an extension trait for a given impl block. The trait name
/// goes into the parenthesized args of the macro, for greppability.
/// For example:
/// ```
/// use rustc_macros::extension;
/// #[extension(pub trait Foo)]
/// impl i32 { fn hello() {} }
/// ```
///
/// expands to:
/// ```
/// pub trait Foo { fn hello(); }
/// impl Foo for i32 { fn hello() {} }
/// ```
#[proc_macro_attribute]
pub fn extension(attr: TokenStream, input: TokenStream) -> TokenStream {
    extension::extension(attr, input)
}

decl_derive!([HashStable, attributes(stable_hasher)] => hash_stable::hash_stable_derive);
decl_derive!(
    [HashStable_Generic, attributes(stable_hasher)] =>
    hash_stable::hash_stable_generic_derive
);
decl_derive!(
    [HashStable_NoContext] =>
    /// `HashStable` implementation that has no `HashStableContext` bound and
    /// which adds `where` bounds for `HashStable` based off of fields and not
    /// generics. This is suitable for use in crates like `rustc_type_ir`.
    hash_stable::hash_stable_no_context_derive
);

decl_derive!([Decodable_Generic] => serialize::decodable_generic_derive);
decl_derive!([Encodable_Generic] => serialize::encodable_generic_derive);
decl_derive!([Decodable] => serialize::decodable_derive);
decl_derive!([Encodable] => serialize::encodable_derive);
decl_derive!([TyDecodable] => serialize::type_decodable_derive);
decl_derive!([TyEncodable] => serialize::type_encodable_derive);
decl_derive!([MetadataDecodable] => serialize::meta_decodable_derive);
decl_derive!([MetadataEncodable] => serialize::meta_encodable_derive);
decl_derive!(
    [TypeFoldable, attributes(type_foldable)] =>
    /// Derives `TypeFoldable` for the annotated `struct` or `enum` (`union` is not supported).
    ///
    /// The fold will produce a value of the same struct or enum variant as the input, with
    /// each field respectively folded using the `TypeFoldable` implementation for its type.
    /// However, if a field of a struct or an enum variant is annotated with
    /// `#[type_foldable(identity)]` then that field will retain its incumbent value (and its
    /// type is not required to implement `TypeFoldable`).
    type_foldable::type_foldable_derive
);
decl_derive!(
    [TypeVisitable, attributes(type_visitable)] =>
    /// Derives `TypeVisitable` for the annotated `struct` or `enum` (`union` is not supported).
    ///
    /// Each field of the struct or enum variant will be visited in definition order, using the
    /// `TypeVisitable` implementation for its type. However, if a field of a struct or an enum
    /// variant is annotated with `#[type_visitable(ignore)]` then that field will not be
    /// visited (and its type is not required to implement `TypeVisitable`).
    type_visitable::type_visitable_derive
);
decl_derive!([Lift, attributes(lift)] => lift::lift_derive);
decl_derive!(
    [Diagnostic, attributes(
        // struct attributes
        diag,
        help,
        note,
        warning,
        // field attributes
        skip_arg,
        primary_span,
        label,
        subdiagnostic,
        suggestion,
        suggestion_short,
        suggestion_hidden,
        suggestion_verbose)] => diagnostics::diagnostic_derive
);
decl_derive!(
    [LintDiagnostic, attributes(
        // struct attributes
        diag,
        help,
        note,
        warning,
        // field attributes
        skip_arg,
        primary_span,
        label,
        subdiagnostic,
        suggestion,
        suggestion_short,
        suggestion_hidden,
        suggestion_verbose)] => diagnostics::lint_diagnostic_derive
);
decl_derive!(
    [Subdiagnostic, attributes(
        // struct/variant attributes
        label,
        help,
        note,
        warning,
        suggestion,
        suggestion_short,
        suggestion_hidden,
        suggestion_verbose,
        multipart_suggestion,
        multipart_suggestion_short,
        multipart_suggestion_hidden,
        multipart_suggestion_verbose,
        // field attributes
        skip_arg,
        primary_span,
        suggestion_part,
        applicability)] => diagnostics::subdiagnostic_derive
);