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//! 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! {
#[derive(HashStable)]
#[max = 0xFFFF_FFFF]
#[debug_format = "CounterValueReference({})"]
pub struct CounterValueReference {}
}
impl CounterValueReference {
/// Counters start at 1 for historical reasons.
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! {
/// Values descend from u32::MAX.
#[derive(HashStable)]
#[max = 0xFFFF_FFFF]
#[debug_format = "InjectedExpressionId({})"]
pub struct InjectedExpressionId {}
}
rustc_index::newtype_index! {
/// 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 {}
}
/// Operand of a coverage-counter expression.
///
/// Operands can be a constant zero value, an actual coverage counter, or another
/// expression. Counter/expression operands are referred to by ID.
#[derive(Copy, Clone, PartialEq, Eq)]
#[derive(TyEncodable, TyDecodable, Hash, HashStable, TypeFoldable, TypeVisitable)]
pub enum Operand {
Zero,
Counter(CounterValueReference),
Expression(InjectedExpressionId),
}
impl Debug for Operand {
fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
match self {
Self::Zero => write!(f, "Zero"),
Self::Counter(id) => f.debug_tuple("Counter").field(&id.as_u32()).finish(),
Self::Expression(id) => f.debug_tuple("Expression").field(&id.as_u32()).finish(),
}
}
}
#[derive(Clone, PartialEq, TyEncodable, TyDecodable, Hash, HashStable, TypeFoldable, TypeVisitable)]
pub enum CoverageKind {
Counter {
function_source_hash: u64,
/// ID of this counter within its enclosing function.
/// Expressions in the same function can refer to it as an operand.
id: CounterValueReference,
},
Expression {
/// ID of this coverage-counter expression within its enclosing function.
/// Other expressions in the same function can refer to it as an operand.
id: InjectedExpressionId,
lhs: Operand,
op: Op,
rhs: Operand,
},
Unreachable,
}
impl CoverageKind {
pub fn as_operand(&self) -> Operand {
use CoverageKind::*;
match *self {
Counter { id, .. } => Operand::Counter(id),
Expression { id, .. } => Operand::Expression(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,
match op {
Op::Add => "+",
Op::Subtract => "-",
},
rhs,
),
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)
}
}
|
