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
|
mod scope;
use std::sync::Arc;
use ra_db::Cancelable;
use ra_syntax::{
TreePtr,
ast::{self, AstNode},
};
use crate::{DefId, DefKind, HirDatabase, ty::InferenceResult, Module, Crate, impl_block::ImplBlock, expr::{Body, BodySyntaxMapping}, type_ref::{TypeRef, Mutability}, Name};
pub use self::scope::{FnScopes, ScopesWithSyntaxMapping};
#[derive(Debug, Clone, PartialEq, Eq)]
pub struct Function {
def_id: DefId,
}
impl Function {
pub(crate) fn new(def_id: DefId) -> Function {
Function { def_id }
}
pub fn def_id(&self) -> DefId {
self.def_id
}
pub fn syntax(&self, db: &impl HirDatabase) -> TreePtr<ast::FnDef> {
let def_loc = self.def_id.loc(db);
assert!(def_loc.kind == DefKind::Function);
let syntax = db.file_item(def_loc.source_item_id);
ast::FnDef::cast(&syntax).unwrap().to_owned()
}
pub fn body(&self, db: &impl HirDatabase) -> Cancelable<Arc<Body>> {
db.body_hir(self.def_id)
}
pub fn body_syntax_mapping(&self, db: &impl HirDatabase) -> Cancelable<Arc<BodySyntaxMapping>> {
db.body_syntax_mapping(self.def_id)
}
pub fn scopes(&self, db: &impl HirDatabase) -> Cancelable<ScopesWithSyntaxMapping> {
let scopes = db.fn_scopes(self.def_id)?;
let syntax_mapping = db.body_syntax_mapping(self.def_id)?;
Ok(ScopesWithSyntaxMapping {
scopes,
syntax_mapping,
})
}
pub fn signature(&self, db: &impl HirDatabase) -> Arc<FnSignature> {
db.fn_signature(self.def_id)
}
pub fn infer(&self, db: &impl HirDatabase) -> Cancelable<Arc<InferenceResult>> {
db.infer(self.def_id)
}
pub fn module(&self, db: &impl HirDatabase) -> Cancelable<Module> {
self.def_id.module(db)
}
pub fn krate(&self, db: &impl HirDatabase) -> Cancelable<Option<Crate>> {
self.def_id.krate(db)
}
/// The containing impl block, if this is a method.
pub fn impl_block(&self, db: &impl HirDatabase) -> Cancelable<Option<ImplBlock>> {
self.def_id.impl_block(db)
}
}
/// The declared signature of a function.
#[derive(Debug, Clone, PartialEq, Eq)]
pub struct FnSignature {
args: Vec<TypeRef>,
ret_type: TypeRef,
}
impl FnSignature {
pub fn args(&self) -> &[TypeRef] {
&self.args
}
pub fn ret_type(&self) -> &TypeRef {
&self.ret_type
}
}
pub(crate) fn fn_signature(db: &impl HirDatabase, def_id: DefId) -> Arc<FnSignature> {
let func = Function::new(def_id);
let node = func.syntax(db);
let mut args = Vec::new();
if let Some(param_list) = node.param_list() {
if let Some(self_param) = param_list.self_param() {
let self_type = if let Some(type_ref) = self_param.type_ref() {
TypeRef::from_ast(type_ref)
} else {
let self_type = TypeRef::Path(Name::self_type().into());
match self_param.flavor() {
ast::SelfParamFlavor::Owned => self_type,
ast::SelfParamFlavor::Ref => {
TypeRef::Reference(Box::new(self_type), Mutability::Shared)
}
ast::SelfParamFlavor::MutRef => {
TypeRef::Reference(Box::new(self_type), Mutability::Mut)
}
}
};
args.push(self_type);
}
for param in param_list.params() {
let type_ref = TypeRef::from_ast_opt(param.type_ref());
args.push(type_ref);
}
}
let ret_type = if let Some(type_ref) = node.ret_type().and_then(|rt| rt.type_ref()) {
TypeRef::from_ast(type_ref)
} else {
TypeRef::unit()
};
let sig = FnSignature { args, ret_type };
Arc::new(sig)
}
|
