Rollup merge of #113428 - Zalathar:operand, r=davidtwco

coverage: Replace `ExpressionOperandId` with enum `Operand`

*This is one step in my larger coverage refactoring ambitions described at <https://github.com/rust-lang/compiler-team/issues/645>.*

LLVM coverage has a concept of “mapping expressions” that allow a span's execution count to be computed as a simple arithmetic expression over other counters/expressions, instead of requiring a dedicated physical counter for every control-flow branch.

These expressions have an operator (`+` or `-`) and two operands. Operands are currently represented as `ExpressionOperandId`, which wraps a `u32` with the following semantics:

- 0 represents a special counter that always has a value of zero
- Values ascending from 1 represent counter IDs
- Values descending from `u32::MAX` represent the IDs of other expressions

---

This change replaces that whole `ExpressionOperandId` scheme with a simple enum that explicitly distinguishes between the three cases.

This lets us remove a lot of fiddly code for dealing with the different operand kinds:
- Previously it was only possible to distinguish between counter-ID operands and expression-ID operands by comparing the operand ID with the total number of counters in a function. This is unnecessary now that the enum distinguishes them explicitly.
- There's no need for expression IDs to descend from `u32::MAX` and then get translated into zero-based indices in certain places. Now that they ascend from zero, they can be used as indices directly.
- There's no need to reserve ID number 0 for the special zero operand, since it can just have its own variant in the enum, so counter IDs can count up from 0.

(Making counter IDs ascend from 0 also lets us fix an off-by-one error in the query for counting the total number of counters, which would cause LLVM to emit an extra unused counter for every instrumented function.)

---

This PR may be easiest to review as individual patches, since that breaks it up into clearly distinct parts:
- Replace a `u32` wrapper with an explicit enum, without changing the semantics of the underlying IDs being stored.
- Change the numbering scheme used by `Operand::Expression` to make expression IDs ascend from 0 (instead of descending from `u32::MAX`).
- Change the numbering scheme used by `Operand::Counter` to make counter IDs ascend from 0 (instead of ascending from 1).

Author: matthiaskrgr

compiler/rustc_codegen_llvm/src/coverageinfo/ffi.rs

@@ -1,4 +1,4 @@
-use rustc_middle::mir::coverage::{CounterValueReference, MappedExpressionIndex};
+use rustc_middle::mir::coverage::{CounterId, MappedExpressionIndex};
 
 /// Must match the layout of `LLVMRustCounterKind`.
 #[derive(Copy, Clone, Debug)]
@@ -36,11 +36,9 @@ impl Counter {
         Self { kind: CounterKind::Zero, id: 0 }
     }
 
-    /// Constructs a new `Counter` of kind `CounterValueReference`, and converts
-    /// the given 1-based counter_id to the required 0-based equivalent for
-    /// the `Counter` encoding.
-    pub fn counter_value_reference(counter_id: CounterValueReference) -> Self {
-        Self { kind: CounterKind::CounterValueReference, id: counter_id.zero_based_index() }
+    /// Constructs a new `Counter` of kind `CounterValueReference`.
+    pub fn counter_value_reference(counter_id: CounterId) -> Self {
+        Self { kind: CounterKind::CounterValueReference, id: counter_id.as_u32() }
     }
 
     /// Constructs a new `Counter` of kind `Expression`.

compiler/rustc_codegen_llvm/src/coverageinfo/map_data.rs

@@ -3,24 +3,22 @@ pub use super::ffi::*;
 use rustc_index::{IndexSlice, IndexVec};
 use rustc_middle::bug;
 use rustc_middle::mir::coverage::{
-    CodeRegion, CounterValueReference, ExpressionOperandId, InjectedExpressionId,
-    InjectedExpressionIndex, MappedExpressionIndex, Op,
+    CodeRegion, CounterId, ExpressionId, MappedExpressionIndex, Op, Operand,
 };
 use rustc_middle::ty::Instance;
 use rustc_middle::ty::TyCtxt;
 
 #[derive(Clone, Debug, PartialEq)]
 pub struct Expression {
-    lhs: ExpressionOperandId,
+    lhs: Operand,
     op: Op,
-    rhs: ExpressionOperandId,
+    rhs: Operand,
     region: Option<CodeRegion>,
 }
 
 /// Collects all of the coverage regions associated with (a) injected counters, (b) counter
 /// expressions (additions or subtraction), and (c) unreachable regions (always counted as zero),
-/// for a given Function. Counters and counter expressions have non-overlapping `id`s because they
-/// can both be operands in an expression. This struct also stores the `function_source_hash`,
+/// for a given Function. This struct also stores the `function_source_hash`,
 /// computed during instrumentation, and forwarded with counters.
 ///
 /// Note, it may be important to understand LLVM's definitions of `unreachable` regions versus "gap
@@ -34,8 +32,8 @@ pub struct FunctionCoverage<'tcx> {
     instance: Instance<'tcx>,
     source_hash: u64,
     is_used: bool,
-    counters: IndexVec<CounterValueReference, Option<CodeRegion>>,
-    expressions: IndexVec<InjectedExpressionIndex, Option<Expression>>,
+    counters: IndexVec<CounterId, Option<CodeRegion>>,
+    expressions: IndexVec<ExpressionId, Option<Expression>>,
     unreachable_regions: Vec<CodeRegion>,
 }
 
@@ -82,48 +80,36 @@ impl<'tcx> FunctionCoverage<'tcx> {
     }
 
     /// Adds a code region to be counted by an injected counter intrinsic.
-    pub fn add_counter(&mut self, id: CounterValueReference, region: CodeRegion) {
+    pub fn add_counter(&mut self, id: CounterId, region: CodeRegion) {
         if let Some(previous_region) = self.counters[id].replace(region.clone()) {
             assert_eq!(previous_region, region, "add_counter: code region for id changed");
         }
     }
 
     /// Both counters and "counter expressions" (or simply, "expressions") can be operands in other
-    /// expressions. Expression IDs start from `u32::MAX` and go down, so the range of expression
-    /// IDs will not overlap with the range of counter IDs. Counters and expressions can be added in
-    /// any order, and expressions can still be assigned contiguous (though descending) IDs, without
-    /// knowing what the last counter ID will be.
-    ///
-    /// When storing the expression data in the `expressions` vector in the `FunctionCoverage`
-    /// struct, its vector index is computed, from the given expression ID, by subtracting from
-    /// `u32::MAX`.
-    ///
-    /// Since the expression operands (`lhs` and `rhs`) can reference either counters or
-    /// expressions, an operand that references an expression also uses its original ID, descending
-    /// from `u32::MAX`. Theses operands are translated only during code generation, after all
-    /// counters and expressions have been added.
+    /// expressions. These are tracked as separate variants of `Operand`, so there is no ambiguity
+    /// between operands that are counter IDs and operands that are expression IDs.
     pub fn add_counter_expression(
         &mut self,
-        expression_id: InjectedExpressionId,
-        lhs: ExpressionOperandId,
+        expression_id: ExpressionId,
+        lhs: Operand,
         op: Op,
-        rhs: ExpressionOperandId,
+        rhs: Operand,
         region: Option<CodeRegion>,
     ) {
         debug!(
             "add_counter_expression({:?}, lhs={:?}, op={:?}, rhs={:?} at {:?}",
             expression_id, lhs, op, rhs, region
         );
-        let expression_index = self.expression_index(u32::from(expression_id));
         debug_assert!(
-            expression_index.as_usize() < self.expressions.len(),
-            "expression_index {} is out of range for expressions.len() = {}
+            expression_id.as_usize() < self.expressions.len(),
+            "expression_id {} is out of range for expressions.len() = {}
             for {:?}",
-            expression_index.as_usize(),
+            expression_id.as_usize(),
             self.expressions.len(),
             self,
         );
-        if let Some(previous_expression) = self.expressions[expression_index].replace(Expression {
+        if let Some(previous_expression) = self.expressions[expression_id].replace(Expression {
             lhs,
             op,
             rhs,
@@ -186,14 +172,11 @@ impl<'tcx> FunctionCoverage<'tcx> {
 
         // This closure converts any `Expression` operand (`lhs` or `rhs` of the `Op::Add` or
         // `Op::Subtract` operation) into its native `llvm::coverage::Counter::CounterKind` type
-        // and value. Operand ID value `0` maps to `CounterKind::Zero`; values in the known range
-        // of injected LLVM counters map to `CounterKind::CounterValueReference` (and the value
-        // matches the injected counter index); and any other value is converted into a
-        // `CounterKind::Expression` with the expression's `new_index`.
+        // and value.
         //
         // Expressions will be returned from this function in a sequential vector (array) of
         // `CounterExpression`, so the expression IDs must be mapped from their original,
-        // potentially sparse set of indexes, originally in reverse order from `u32::MAX`.
+        // potentially sparse set of indexes.
         //
         // An `Expression` as an operand will have already been encountered as an `Expression` with
         // operands, so its new_index will already have been generated (as a 1-up index value).
@@ -206,34 +189,19 @@ impl<'tcx> FunctionCoverage<'tcx> {
         // `expression_index`s lower than the referencing `Expression`. Therefore, it is
         // reasonable to look up the new index of an expression operand while the `new_indexes`
         // vector is only complete up to the current `ExpressionIndex`.
-        let id_to_counter = |new_indexes: &IndexSlice<
-            InjectedExpressionIndex,
-            Option<MappedExpressionIndex>,
-        >,
-                             id: ExpressionOperandId| {
-            if id == ExpressionOperandId::ZERO {
-                Some(Counter::zero())
-            } else if id.index() < self.counters.len() {
-                debug_assert!(
-                    id.index() > 0,
-                    "ExpressionOperandId indexes for counters are 1-based, but this id={}",
-                    id.index()
-                );
-                // Note: Some codegen-injected Counters may be only referenced by `Expression`s,
-                // and may not have their own `CodeRegion`s,
-                let index = CounterValueReference::from(id.index());
-                // Note, the conversion to LLVM `Counter` adjusts the index to be zero-based.
-                Some(Counter::counter_value_reference(index))
-            } else {
-                let index = self.expression_index(u32::from(id));
+        type NewIndexes = IndexSlice<ExpressionId, Option<MappedExpressionIndex>>;
+        let id_to_counter = |new_indexes: &NewIndexes, operand: Operand| match operand {
+            Operand::Zero => Some(Counter::zero()),
+            Operand::Counter(id) => Some(Counter::counter_value_reference(id)),
+            Operand::Expression(id) => {
                 self.expressions
-                    .get(index)
+                    .get(id)
                     .expect("expression id is out of range")
                     .as_ref()
                     // If an expression was optimized out, assume it would have produced a count
                     // of zero. This ensures that expressions dependent on optimized-out
                     // expressions are still valid.
-                    .map_or(Some(Counter::zero()), |_| new_indexes[index].map(Counter::expression))
+                    .map_or(Some(Counter::zero()), |_| new_indexes[id].map(Counter::expression))
             }
         };
 
@@ -340,9 +308,4 @@ impl<'tcx> FunctionCoverage<'tcx> {
     fn unreachable_regions(&self) -> impl Iterator<Item = (Counter, &CodeRegion)> {
         self.unreachable_regions.iter().map(|region| (Counter::zero(), region))
     }
-
-    fn expression_index(&self, id_descending_from_max: u32) -> InjectedExpressionIndex {
-        debug_assert!(id_descending_from_max >= self.counters.len() as u32);
-        InjectedExpressionIndex::from(u32::MAX - id_descending_from_max)
-    }
 }

compiler/rustc_codegen_llvm/src/coverageinfo/mod.rs

@@ -16,9 +16,7 @@ use rustc_hir as hir;
 use rustc_hir::def_id::DefId;
 use rustc_llvm::RustString;
 use rustc_middle::bug;
-use rustc_middle::mir::coverage::{
-    CodeRegion, CounterValueReference, CoverageKind, ExpressionOperandId, InjectedExpressionId, Op,
-};
+use rustc_middle::mir::coverage::{CodeRegion, CounterId, CoverageKind, ExpressionId, Op, Operand};
 use rustc_middle::mir::Coverage;
 use rustc_middle::ty;
 use rustc_middle::ty::layout::{FnAbiOf, HasTyCtxt};
@@ -33,7 +31,7 @@ mod ffi;
 pub(crate) mod map_data;
 pub mod mapgen;
 
-const UNUSED_FUNCTION_COUNTER_ID: CounterValueReference = CounterValueReference::START;
+const UNUSED_FUNCTION_COUNTER_ID: CounterId = CounterId::START;
 
 const VAR_ALIGN_BYTES: usize = 8;
 
@@ -125,7 +123,7 @@ impl<'tcx> CoverageInfoBuilderMethods<'tcx> for Builder<'_, '_, 'tcx> {
                     let fn_name = bx.get_pgo_func_name_var(instance);
                     let hash = bx.const_u64(function_source_hash);
                     let num_counters = bx.const_u32(coverageinfo.num_counters);
-                    let index = bx.const_u32(id.zero_based_index());
+                    let index = bx.const_u32(id.as_u32());
                     debug!(
                         "codegen intrinsic instrprof.increment(fn_name={:?}, hash={:?}, num_counters={:?}, index={:?})",
                         fn_name, hash, num_counters, index,
@@ -178,7 +176,7 @@ impl<'tcx> Builder<'_, '_, 'tcx> {
     fn add_coverage_counter(
         &mut self,
         instance: Instance<'tcx>,
-        id: CounterValueReference,
+        id: CounterId,
         region: CodeRegion,
     ) -> bool {
         if let Some(coverage_context) = self.coverage_context() {
@@ -202,10 +200,10 @@ impl<'tcx> Builder<'_, '_, 'tcx> {
     fn add_coverage_counter_expression(
         &mut self,
         instance: Instance<'tcx>,
-        id: InjectedExpressionId,
-        lhs: ExpressionOperandId,
+        id: ExpressionId,
+        lhs: Operand,
         op: Op,
-        rhs: ExpressionOperandId,
+        rhs: Operand,
         region: Option<CodeRegion>,
     ) -> bool {
         if let Some(coverage_context) = self.coverage_context() {