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
|
//! Metadata from source code coverage analysis and instrumentation.
use rustc_macros::HashStable;
use rustc_span::Symbol;
use std::fmt::{self, Debug, Formatter};
rustc_index::newtype_index! {
/// An ExpressionOperandId value is assigned directly from either a
/// CounterValueReference.as_u32() (which ascend from 1) or an ExpressionOperandId.as_u32()
/// (which _*descend*_ from u32::MAX). Id value `0` (zero) represents a virtual counter with a
/// constant value of `0`.
#[derive(HashStable)]
#[max = 0xFFFF_FFFF]
#[debug_format = "ExpressionOperandId({})"]
pub struct ExpressionOperandId {
}
}
impl ExpressionOperandId {
/// An expression operand for a "zero counter", as described in the following references:
///
/// * <https://github.com/rust-lang/llvm-project/blob/rustc/13.0-2021-09-30/llvm/docs/CoverageMappingFormat.rst#counter>
/// * <https://github.com/rust-lang/llvm-project/blob/rustc/13.0-2021-09-30/llvm/docs/CoverageMappingFormat.rst#tag>
/// * <https://github.com/rust-lang/llvm-project/blob/rustc/13.0-2021-09-30/llvm/docs/CoverageMappingFormat.rst#counter-expressions>
///
/// This operand can be used to count two or more separate code regions with a single counter,
/// if they run sequentially with no branches, by injecting the `Counter` in a `BasicBlock` for
/// one of the code regions, and inserting `CounterExpression`s ("add ZERO to the counter") in
/// the coverage map for the other code regions.
pub const ZERO: Self = Self::from_u32(0);
}
rustc_index::newtype_index! {
#[derive(HashStable)]
#[max = 0xFFFF_FFFF]
#[debug_format = "CounterValueReference({})"]
pub struct CounterValueReference {}
}
impl CounterValueReference {
/// Counters start at 1 to reserve 0 for ExpressionOperandId::ZERO.
pub const START: Self = Self::from_u32(1);
/// Returns explicitly-requested zero-based version of the counter id, used
/// during codegen. LLVM expects zero-based indexes.
pub fn zero_based_index(self) -> u32 {
let one_based_index = self.as_u32();
debug_assert!(one_based_index > 0);
one_based_index - 1
}
}
rustc_index::newtype_index! {
/// InjectedExpressionId.as_u32() converts to ExpressionOperandId.as_u32()
///
/// Values descend from u32::MAX.
#[derive(HashStable)]
#[max = 0xFFFF_FFFF]
#[debug_format = "InjectedExpressionId({})"]
pub struct InjectedExpressionId {}
}
rustc_index::newtype_index! {
/// InjectedExpressionIndex.as_u32() translates to u32::MAX - ExpressionOperandId.as_u32()
///
/// Values ascend from 0.
#[derive(HashStable)]
#[max = 0xFFFF_FFFF]
#[debug_format = "InjectedExpressionIndex({})"]
pub struct InjectedExpressionIndex {}
}
rustc_index::newtype_index! {
/// MappedExpressionIndex values ascend from zero, and are recalculated indexes based on their
/// array position in the LLVM coverage map "Expressions" array, which is assembled during the
/// "mapgen" process. They cannot be computed algorithmically, from the other `newtype_index`s.
#[derive(HashStable)]
#[max = 0xFFFF_FFFF]
#[debug_format = "MappedExpressionIndex({})"]
pub struct MappedExpressionIndex {}
}
impl From<CounterValueReference> for ExpressionOperandId {
#[inline]
fn from(v: CounterValueReference) -> ExpressionOperandId {
ExpressionOperandId::from(v.as_u32())
}
}
impl From<InjectedExpressionId> for ExpressionOperandId {
#[inline]
fn from(v: InjectedExpressionId) -> ExpressionOperandId {
ExpressionOperandId::from(v.as_u32())
}
}
#[derive(Clone, PartialEq, TyEncodable, TyDecodable, Hash, HashStable, TypeFoldable, TypeVisitable)]
pub enum CoverageKind {
Counter {
function_source_hash: u64,
id: CounterValueReference,
},
Expression {
id: InjectedExpressionId,
lhs: ExpressionOperandId,
op: Op,
rhs: ExpressionOperandId,
},
Unreachable,
}
impl CoverageKind {
pub fn as_operand_id(&self) -> ExpressionOperandId {
use CoverageKind::*;
match *self {
Counter { id, .. } => ExpressionOperandId::from(id),
Expression { id, .. } => ExpressionOperandId::from(id),
Unreachable => bug!("Unreachable coverage cannot be part of an expression"),
}
}
pub fn is_expression(&self) -> bool {
matches!(self, Self::Expression { .. })
}
}
impl Debug for CoverageKind {
fn fmt(&self, fmt: &mut Formatter<'_>) -> fmt::Result {
use CoverageKind::*;
match self {
Counter { id, .. } => write!(fmt, "Counter({:?})", id.index()),
Expression { id, lhs, op, rhs } => write!(
fmt,
"Expression({:?}) = {} {} {}",
id.index(),
lhs.index(),
if *op == Op::Add { "+" } else { "-" },
rhs.index(),
),
Unreachable => write!(fmt, "Unreachable"),
}
}
}
#[derive(Clone, TyEncodable, TyDecodable, Hash, HashStable, PartialEq, Eq, PartialOrd, Ord)]
#[derive(TypeFoldable, TypeVisitable)]
pub struct CodeRegion {
pub file_name: Symbol,
pub start_line: u32,
pub start_col: u32,
pub end_line: u32,
pub end_col: u32,
}
impl Debug for CodeRegion {
fn fmt(&self, fmt: &mut Formatter<'_>) -> fmt::Result {
write!(
fmt,
"{}:{}:{} - {}:{}",
self.file_name, self.start_line, self.start_col, self.end_line, self.end_col
)
}
}
#[derive(Copy, Clone, Debug, PartialEq, TyEncodable, TyDecodable, Hash, HashStable)]
#[derive(TypeFoldable, TypeVisitable)]
pub enum Op {
Subtract,
Add,
}
impl Op {
pub fn is_add(&self) -> bool {
matches!(self, Self::Add)
}
pub fn is_subtract(&self) -> bool {
matches!(self, Self::Subtract)
}
}
|
