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
|
//! Implementation of Chalk debug helper functions using TLS.
use std::fmt::{self, Display};
use itertools::Itertools;
use crate::{
chalk_db, db::HirDatabase, from_assoc_type_id, from_chalk_trait_id, mapping::from_chalk,
CallableDefId, Interner,
};
use hir_def::{AdtId, ItemContainerId, Lookup, TypeAliasId};
pub(crate) use unsafe_tls::{set_current_program, with_current_program};
pub(crate) struct DebugContext<'a>(&'a dyn HirDatabase);
impl DebugContext<'_> {
pub(crate) fn debug_struct_id(
&self,
id: chalk_db::AdtId,
f: &mut fmt::Formatter<'_>,
) -> Result<(), fmt::Error> {
let name = match id.0 {
AdtId::StructId(it) => self.0.struct_data(it).name.clone(),
AdtId::UnionId(it) => self.0.union_data(it).name.clone(),
AdtId::EnumId(it) => self.0.enum_data(it).name.clone(),
};
name.fmt(f)
}
pub(crate) fn debug_trait_id(
&self,
id: chalk_db::TraitId,
f: &mut fmt::Formatter<'_>,
) -> Result<(), fmt::Error> {
let trait_: hir_def::TraitId = from_chalk_trait_id(id);
let trait_data = self.0.trait_data(trait_);
trait_data.name.fmt(f)
}
pub(crate) fn debug_assoc_type_id(
&self,
id: chalk_db::AssocTypeId,
fmt: &mut fmt::Formatter<'_>,
) -> Result<(), fmt::Error> {
let type_alias: TypeAliasId = from_assoc_type_id(id);
let type_alias_data = self.0.type_alias_data(type_alias);
let trait_ = match type_alias.lookup(self.0.upcast()).container {
ItemContainerId::TraitId(t) => t,
_ => panic!("associated type not in trait"),
};
let trait_data = self.0.trait_data(trait_);
write!(fmt, "{}::{}", trait_data.name, type_alias_data.name)
}
pub(crate) fn debug_projection_ty(
&self,
projection_ty: &chalk_ir::ProjectionTy<Interner>,
fmt: &mut fmt::Formatter<'_>,
) -> Result<(), fmt::Error> {
let type_alias = from_assoc_type_id(projection_ty.associated_ty_id);
let type_alias_data = self.0.type_alias_data(type_alias);
let trait_ = match type_alias.lookup(self.0.upcast()).container {
ItemContainerId::TraitId(t) => t,
_ => panic!("associated type not in trait"),
};
let trait_data = self.0.trait_data(trait_);
let params = projection_ty.substitution.as_slice(Interner);
write!(fmt, "<{:?} as {}", ¶ms[0], trait_data.name,)?;
if params.len() > 1 {
write!(
fmt,
"<{}>",
¶ms[1..].iter().format_with(", ", |x, f| f(&format_args!("{:?}", x))),
)?;
}
write!(fmt, ">::{}", type_alias_data.name)
}
pub(crate) fn debug_fn_def_id(
&self,
fn_def_id: chalk_ir::FnDefId<Interner>,
fmt: &mut fmt::Formatter<'_>,
) -> Result<(), fmt::Error> {
let def: CallableDefId = from_chalk(self.0, fn_def_id);
let name = match def {
CallableDefId::FunctionId(ff) => self.0.function_data(ff).name.clone(),
CallableDefId::StructId(s) => self.0.struct_data(s).name.clone(),
CallableDefId::EnumVariantId(e) => {
let enum_data = self.0.enum_data(e.parent);
enum_data.variants[e.local_id].name.clone()
}
};
match def {
CallableDefId::FunctionId(_) => write!(fmt, "{{fn {}}}", name),
CallableDefId::StructId(_) | CallableDefId::EnumVariantId(_) => {
write!(fmt, "{{ctor {}}}", name)
}
}
}
}
mod unsafe_tls {
use super::DebugContext;
use crate::db::HirDatabase;
use scoped_tls::scoped_thread_local;
scoped_thread_local!(static PROGRAM: DebugContext<'_>);
pub(crate) fn with_current_program<R>(
op: impl for<'a> FnOnce(Option<&'a DebugContext<'a>>) -> R,
) -> R {
if PROGRAM.is_set() {
PROGRAM.with(|prog| op(Some(prog)))
} else {
op(None)
}
}
pub(crate) fn set_current_program<OP, R>(p: &dyn HirDatabase, op: OP) -> R
where
OP: FnOnce() -> R,
{
let ctx = DebugContext(p);
// we're transmuting the lifetime in the DebugContext to static. This is
// fine because we only keep the reference for the lifetime of this
// function, *and* the only way to access the context is through
// `with_current_program`, which hides the lifetime through the `for`
// type.
let static_p: &DebugContext<'static> =
unsafe { std::mem::transmute::<&DebugContext<'_>, &DebugContext<'static>>(&ctx) };
PROGRAM.set(static_p, op)
}
}
|
