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
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
//! the rustc crate store interface. This also includes types that
//! are *mostly* used as a part of that interface, but these should
//! probably get a better home if someone can find one.

use crate::search_paths::PathKind;
use crate::utils::NativeLibKind;
use crate::Session;
use rustc_ast as ast;
use rustc_data_structures::sync::{self, AppendOnlyIndexVec, FreezeLock};
use rustc_hir::def_id::{CrateNum, DefId, LocalDefId, StableCrateId, LOCAL_CRATE};
use rustc_hir::definitions::{DefKey, DefPath, DefPathHash, Definitions};
use rustc_span::hygiene::{ExpnHash, ExpnId};
use rustc_span::symbol::Symbol;
use rustc_span::Span;
use rustc_target::spec::abi::Abi;

use std::any::Any;
use std::path::PathBuf;

// lonely orphan structs and enums looking for a better home

/// Where a crate came from on the local filesystem. One of these three options
/// must be non-None.
#[derive(PartialEq, Clone, Debug, HashStable_Generic, Encodable, Decodable)]
pub struct CrateSource {
    pub dylib: Option<(PathBuf, PathKind)>,
    pub rlib: Option<(PathBuf, PathKind)>,
    pub rmeta: Option<(PathBuf, PathKind)>,
}

impl CrateSource {
    #[inline]
    pub fn paths(&self) -> impl Iterator<Item = &PathBuf> {
        self.dylib.iter().chain(self.rlib.iter()).chain(self.rmeta.iter()).map(|p| &p.0)
    }
}

#[derive(Encodable, Decodable, Copy, Clone, Ord, PartialOrd, Eq, PartialEq, Debug)]
#[derive(HashStable_Generic)]
pub enum CrateDepKind {
    /// A dependency that is only used for its macros.
    MacrosOnly,
    /// A dependency that is always injected into the dependency list and so
    /// doesn't need to be linked to an rlib, e.g., the injected allocator.
    Implicit,
    /// A dependency that is required by an rlib version of this crate.
    /// Ordinary `extern crate`s result in `Explicit` dependencies.
    Explicit,
}

impl CrateDepKind {
    #[inline]
    pub fn macros_only(self) -> bool {
        match self {
            CrateDepKind::MacrosOnly => true,
            CrateDepKind::Implicit | CrateDepKind::Explicit => false,
        }
    }
}

#[derive(Copy, Debug, PartialEq, Clone, Encodable, Decodable, HashStable_Generic)]
pub enum LinkagePreference {
    RequireDynamic,
    RequireStatic,
}

#[derive(Debug, Encodable, Decodable, HashStable_Generic)]
pub struct NativeLib {
    pub kind: NativeLibKind,
    pub name: Symbol,
    /// If packed_bundled_libs enabled, actual filename of library is stored.
    pub filename: Option<Symbol>,
    pub cfg: Option<ast::MetaItem>,
    pub foreign_module: Option<DefId>,
    pub verbatim: Option<bool>,
    pub dll_imports: Vec<DllImport>,
}

impl NativeLib {
    pub fn has_modifiers(&self) -> bool {
        self.verbatim.is_some() || self.kind.has_modifiers()
    }

    pub fn wasm_import_module(&self) -> Option<Symbol> {
        if self.kind == NativeLibKind::WasmImportModule { Some(self.name) } else { None }
    }
}

/// Different ways that the PE Format can decorate a symbol name.
/// From <https://docs.microsoft.com/en-us/windows/win32/debug/pe-format#import-name-type>
#[derive(Copy, Clone, Debug, Encodable, Decodable, HashStable_Generic, PartialEq, Eq)]
pub enum PeImportNameType {
    /// IMPORT_ORDINAL
    /// Uses the ordinal (i.e., a number) rather than the name.
    Ordinal(u16),
    /// Same as IMPORT_NAME
    /// Name is decorated with all prefixes and suffixes.
    Decorated,
    /// Same as IMPORT_NAME_NOPREFIX
    /// Prefix (e.g., the leading `_` or `@`) is skipped, but suffix is kept.
    NoPrefix,
    /// Same as IMPORT_NAME_UNDECORATE
    /// Prefix (e.g., the leading `_` or `@`) and suffix (the first `@` and all
    /// trailing characters) are skipped.
    Undecorated,
}

#[derive(Clone, Debug, Encodable, Decodable, HashStable_Generic)]
pub struct DllImport {
    pub name: Symbol,
    pub import_name_type: Option<PeImportNameType>,
    /// Calling convention for the function.
    ///
    /// On x86_64, this is always `DllCallingConvention::C`; on i686, it can be any
    /// of the values, and we use `DllCallingConvention::C` to represent `"cdecl"`.
    pub calling_convention: DllCallingConvention,
    /// Span of import's "extern" declaration; used for diagnostics.
    pub span: Span,
    /// Is this for a function (rather than a static variable).
    pub is_fn: bool,
}

impl DllImport {
    pub fn ordinal(&self) -> Option<u16> {
        if let Some(PeImportNameType::Ordinal(ordinal)) = self.import_name_type {
            Some(ordinal)
        } else {
            None
        }
    }
}

/// Calling convention for a function defined in an external library.
///
/// The usize value, where present, indicates the size of the function's argument list
/// in bytes.
#[derive(Clone, PartialEq, Debug, Encodable, Decodable, HashStable_Generic)]
pub enum DllCallingConvention {
    C,
    Stdcall(usize),
    Fastcall(usize),
    Vectorcall(usize),
}

#[derive(Clone, Encodable, Decodable, HashStable_Generic, Debug)]
pub struct ForeignModule {
    pub foreign_items: Vec<DefId>,
    pub def_id: DefId,
    pub abi: Abi,
}

#[derive(Copy, Clone, Debug, HashStable_Generic)]
pub struct ExternCrate {
    pub src: ExternCrateSource,

    /// span of the extern crate that caused this to be loaded
    pub span: Span,

    /// Number of links to reach the extern;
    /// used to select the extern with the shortest path
    pub path_len: usize,

    /// Crate that depends on this crate
    pub dependency_of: CrateNum,
}

impl ExternCrate {
    /// If true, then this crate is the crate named by the extern
    /// crate referenced above. If false, then this crate is a dep
    /// of the crate.
    #[inline]
    pub fn is_direct(&self) -> bool {
        self.dependency_of == LOCAL_CRATE
    }

    #[inline]
    pub fn rank(&self) -> impl PartialOrd {
        // Prefer:
        // - direct extern crate to indirect
        // - shorter paths to longer
        (self.is_direct(), !self.path_len)
    }
}

#[derive(Copy, Clone, Debug, HashStable_Generic)]
pub enum ExternCrateSource {
    /// Crate is loaded by `extern crate`.
    Extern(
        /// def_id of the item in the current crate that caused
        /// this crate to be loaded; note that there could be multiple
        /// such ids
        DefId,
    ),
    /// Crate is implicitly loaded by a path resolving through extern prelude.
    Path,
}

/// A store of Rust crates, through which their metadata can be accessed.
///
/// Note that this trait should probably not be expanding today. All new
/// functionality should be driven through queries instead!
///
/// If you find a method on this trait named `{name}_untracked` it signifies
/// that it's *not* tracked for dependency information throughout compilation
/// (it'd break incremental compilation) and should only be called pre-HIR (e.g.
/// during resolve)
pub trait CrateStore: std::fmt::Debug {
    fn as_any(&self) -> &dyn Any;
    fn untracked_as_any(&mut self) -> &mut dyn Any;

    // Foreign definitions.
    // This information is safe to access, since it's hashed as part of the DefPathHash, which incr.
    // comp. uses to identify a DefId.
    fn def_key(&self, def: DefId) -> DefKey;
    fn def_path(&self, def: DefId) -> DefPath;
    fn def_path_hash(&self, def: DefId) -> DefPathHash;

    // This information is safe to access, since it's hashed as part of the StableCrateId, which
    // incr. comp. uses to identify a CrateNum.
    fn crate_name(&self, cnum: CrateNum) -> Symbol;
    fn stable_crate_id(&self, cnum: CrateNum) -> StableCrateId;
    fn stable_crate_id_to_crate_num(&self, stable_crate_id: StableCrateId) -> CrateNum;

    /// Fetch a DefId from a DefPathHash for a foreign crate.
    fn def_path_hash_to_def_id(&self, cnum: CrateNum, hash: DefPathHash) -> DefId;
    fn expn_hash_to_expn_id(
        &self,
        sess: &Session,
        cnum: CrateNum,
        index_guess: u32,
        hash: ExpnHash,
    ) -> ExpnId;

    /// Imports all `SourceFile`s from the given crate into the current session.
    /// This normally happens automatically when we decode a `Span` from
    /// that crate's metadata - however, the incr comp cache needs
    /// to trigger this manually when decoding a foreign `Span`
    fn import_source_files(&self, sess: &Session, cnum: CrateNum);
}

pub type CrateStoreDyn = dyn CrateStore + sync::DynSync + sync::DynSend;

pub struct Untracked {
    pub cstore: FreezeLock<Box<CrateStoreDyn>>,
    /// Reference span for definitions.
    pub source_span: AppendOnlyIndexVec<LocalDefId, Span>,
    pub definitions: FreezeLock<Definitions>,
}