68 lines
2.6 KiB
Rust
68 lines
2.6 KiB
Rust
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use super::map::{CounterValueReference, MappedExpressionIndex};
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/// Aligns with [llvm::coverage::Counter::CounterKind](https://github.com/rust-lang/llvm-project/blob/rustc/10.0-2020-05-05/llvm/include/llvm/ProfileData/Coverage/CoverageMapping.h#L91)
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#[derive(Copy, Clone, Debug)]
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#[repr(C)]
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enum CounterKind {
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Zero = 0,
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CounterValueReference = 1,
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Expression = 2,
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}
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/// A reference to an instance of an abstract "counter" that will yield a value in a coverage
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/// report. Note that `id` has different interpretations, depending on the `kind`:
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/// * For `CounterKind::Zero`, `id` is assumed to be `0`
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/// * For `CounterKind::CounterValueReference`, `id` matches the `counter_id` of the injected
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/// instrumentation counter (the `index` argument to the LLVM intrinsic
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/// `instrprof.increment()`)
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/// * For `CounterKind::Expression`, `id` is the index into the coverage map's array of
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/// counter expressions.
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/// Aligns with [llvm::coverage::Counter](https://github.com/rust-lang/llvm-project/blob/rustc/10.0-2020-05-05/llvm/include/llvm/ProfileData/Coverage/CoverageMapping.h#L98-L99)
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/// Important: The Rust struct layout (order and types of fields) must match its C++ counterpart.
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#[derive(Copy, Clone, Debug)]
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#[repr(C)]
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pub struct Counter {
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// Important: The layout (order and types of fields) must match its C++ counterpart.
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kind: CounterKind,
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id: u32,
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}
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impl Counter {
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pub fn zero() -> Self {
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Self { kind: CounterKind::Zero, id: 0 }
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}
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pub fn counter_value_reference(counter_id: CounterValueReference) -> Self {
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Self { kind: CounterKind::CounterValueReference, id: counter_id.into() }
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}
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pub fn expression(mapped_expression_index: MappedExpressionIndex) -> Self {
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Self { kind: CounterKind::Expression, id: mapped_expression_index.into() }
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}
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}
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/// Aligns with [llvm::coverage::CounterExpression::ExprKind](https://github.com/rust-lang/llvm-project/blob/rustc/10.0-2020-05-05/llvm/include/llvm/ProfileData/Coverage/CoverageMapping.h#L146)
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#[derive(Copy, Clone, Debug)]
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#[repr(C)]
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pub enum ExprKind {
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Subtract = 0,
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Add = 1,
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}
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/// Aligns with [llvm::coverage::CounterExpression](https://github.com/rust-lang/llvm-project/blob/rustc/10.0-2020-05-05/llvm/include/llvm/ProfileData/Coverage/CoverageMapping.h#L147-L148)
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/// Important: The Rust struct layout (order and types of fields) must match its C++
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/// counterpart.
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#[derive(Copy, Clone, Debug)]
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#[repr(C)]
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pub struct CounterExpression {
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kind: ExprKind,
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lhs: Counter,
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rhs: Counter,
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}
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impl CounterExpression {
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pub fn new(lhs: Counter, kind: ExprKind, rhs: Counter) -> Self {
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Self { kind, lhs, rhs }
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}
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}
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