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coverage: Simplify building coverage expressions based on sums #117651

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merged 8 commits into from
Nov 26, 2023
Merged

coverage: Simplify building coverage expressions based on sums #117651

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2cadd31
coverage: Rename parameter `branching_bcb` to `from_bcb`
Zalathar Oct 30, 2023
0a17f06
coverage: Push down and inline `bcb_needs_branch_counters`
Zalathar Oct 30, 2023
df23279
coverage: Push down creation of a visited node's counter
Zalathar Oct 30, 2023
31113c5
coverage: Use `BcbCounter` to build coverage expressions
Zalathar Nov 1, 2023
a1e2c10
coverage: Simplify building coverage expressions based on sums
Zalathar Oct 31, 2023
276a329
coverage: Extract `CoverageGraph::bcb_has_multiple_in_edges`
Zalathar Oct 30, 2023
3b9d703
coverage: Eliminate `BcbBranch`
Zalathar Nov 1, 2023
3163bc8
coverage: Assert that bcb0 starts with bb0 and has no in-edges
Zalathar Nov 5, 2023
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309 changes: 143 additions & 166 deletions compiler/rustc_mir_transform/src/coverage/counters.rs
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66 changes: 27 additions & 39 deletions compiler/rustc_mir_transform/src/coverage/graph.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -62,6 +62,14 @@ impl CoverageGraph {
Self { bcbs, bb_to_bcb, successors, predecessors, dominators: None };
let dominators = dominators::dominators(&basic_coverage_blocks);
basic_coverage_blocks.dominators = Some(dominators);

// The coverage graph's entry-point node (bcb0) always starts with bb0,
// which never has predecessors. Any other blocks merged into bcb0 can't
// have multiple (coverage-relevant) predecessors, so bcb0 always has
// zero in-edges.
assert!(basic_coverage_blocks[START_BCB].leader_bb() == mir::START_BLOCK);
assert!(basic_coverage_blocks.predecessors[START_BCB].is_empty());

basic_coverage_blocks
}

Expand Down Expand Up @@ -199,6 +207,25 @@ impl CoverageGraph {
pub fn cmp_in_dominator_order(&self, a: BasicCoverageBlock, b: BasicCoverageBlock) -> Ordering {
self.dominators.as_ref().unwrap().cmp_in_dominator_order(a, b)
}

/// Returns true if the given node has 2 or more in-edges, i.e. 2 or more
/// predecessors.
///
/// This property is interesting to code that assigns counters to nodes and
/// edges, because if a node _doesn't_ have multiple in-edges, then there's
/// no benefit in having a separate counter for its in-edge, because it
/// would have the same value as the node's own counter.
///
/// FIXME: That assumption might not be true for [`TerminatorKind::Yield`]?
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Note that this concern is equally true of the old code and the new code.

It's just a corner-case that came to mind while writing up these docs.

#[inline(always)]
pub(super) fn bcb_has_multiple_in_edges(&self, bcb: BasicCoverageBlock) -> bool {
// Even though bcb0 conceptually has an extra virtual in-edge due to
// being the entry point, we've already asserted that it has no _other_
// in-edges, so there's no possibility of it having _multiple_ in-edges.
// (And since its virtual in-edge doesn't exist in the graph, that edge
// can't have a separate counter anyway.)
self.predecessors[bcb].len() > 1
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Should there be a special case for the entry bcb?

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I've added an extra patch with some assertions/comments explaining why we don't have to worry about the special case of bcb0.

}
}

impl Index<BasicCoverageBlock> for CoverageGraph {
Expand Down Expand Up @@ -319,45 +346,6 @@ impl BasicCoverageBlockData {
}
}

/// Represents a successor from a branching BasicCoverageBlock (such as the arms of a `SwitchInt`)
/// as either the successor BCB itself, if it has only one incoming edge, or the successor _plus_
/// the specific branching BCB, representing the edge between the two. The latter case
/// distinguishes this incoming edge from other incoming edges to the same `target_bcb`.
#[derive(Clone, Copy, PartialEq, Eq)]
pub(super) struct BcbBranch {
pub edge_from_bcb: Option<BasicCoverageBlock>,
pub target_bcb: BasicCoverageBlock,
}

impl BcbBranch {
pub fn from_to(
from_bcb: BasicCoverageBlock,
to_bcb: BasicCoverageBlock,
basic_coverage_blocks: &CoverageGraph,
) -> Self {
let edge_from_bcb = if basic_coverage_blocks.predecessors[to_bcb].len() > 1 {
Some(from_bcb)
} else {
None
};
Self { edge_from_bcb, target_bcb: to_bcb }
}

pub fn is_only_path_to_target(&self) -> bool {
self.edge_from_bcb.is_none()
}
}

impl std::fmt::Debug for BcbBranch {
fn fmt(&self, fmt: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
if let Some(from_bcb) = self.edge_from_bcb {
write!(fmt, "{:?}->{:?}", from_bcb, self.target_bcb)
} else {
write!(fmt, "{:?}", self.target_bcb)
}
}
}

// Returns the subset of a block's successors that are relevant to the coverage
// graph, i.e. those that do not represent unwinds or unreachable branches.
// FIXME(#78544): MIR InstrumentCoverage: Improve coverage of `#[should_panic]` tests and
Expand Down
28 changes: 14 additions & 14 deletions tests/coverage/async.cov-map
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Original file line number Diff line number Diff line change
Expand Up @@ -197,12 +197,12 @@ Number of file 0 mappings: 1
- Code(Counter(0)) at (prev + 38, 1) to (start + 0, 19)

Function name: async::i::{closure#0}
Raw bytes (78): 0x[01, 01, 02, 19, 07, 1d, 21, 0e, 01, 26, 13, 04, 0c, 0d, 05, 09, 00, 0a, 01, 00, 0e, 00, 12, 05, 00, 13, 00, 18, 09, 00, 1c, 00, 21, 0d, 00, 27, 00, 2a, 15, 00, 2b, 00, 30, 1d, 01, 09, 00, 0a, 11, 00, 0e, 00, 11, 25, 00, 12, 00, 17, 29, 00, 1b, 00, 20, 1d, 00, 24, 00, 26, 21, 01, 0e, 00, 10, 03, 02, 01, 00, 02]
Raw bytes (78): 0x[01, 01, 02, 07, 21, 19, 1d, 0e, 01, 26, 13, 04, 0c, 0d, 05, 09, 00, 0a, 01, 00, 0e, 00, 12, 05, 00, 13, 00, 18, 09, 00, 1c, 00, 21, 0d, 00, 27, 00, 2a, 15, 00, 2b, 00, 30, 1d, 01, 09, 00, 0a, 11, 00, 0e, 00, 11, 25, 00, 12, 00, 17, 29, 00, 1b, 00, 20, 1d, 00, 24, 00, 26, 21, 01, 0e, 00, 10, 03, 02, 01, 00, 02]
Number of files: 1
- file 0 => global file 1
Number of expressions: 2
- expression 0 operands: lhs = Counter(6), rhs = Expression(1, Add)
- expression 1 operands: lhs = Counter(7), rhs = Counter(8)
- expression 0 operands: lhs = Expression(1, Add), rhs = Counter(8)
- expression 1 operands: lhs = Counter(6), rhs = Counter(7)
Number of file 0 mappings: 14
- Code(Counter(0)) at (prev + 38, 19) to (start + 4, 12)
- Code(Counter(3)) at (prev + 5, 9) to (start + 0, 10)
Expand All @@ -218,15 +218,15 @@ Number of file 0 mappings: 14
- Code(Counter(7)) at (prev + 0, 36) to (start + 0, 38)
- Code(Counter(8)) at (prev + 1, 14) to (start + 0, 16)
- Code(Expression(0, Add)) at (prev + 2, 1) to (start + 0, 2)
= (c6 + (c7 + c8))
= ((c6 + c7) + c8)

Function name: async::j
Raw bytes (53): 0x[01, 01, 02, 05, 07, 09, 0d, 09, 01, 31, 01, 13, 0c, 05, 14, 09, 00, 0a, 01, 00, 0e, 00, 1b, 05, 00, 1f, 00, 27, 09, 01, 09, 00, 0a, 11, 00, 0e, 00, 1a, 09, 00, 1e, 00, 20, 0d, 01, 0e, 00, 10, 03, 02, 01, 00, 02]
Raw bytes (53): 0x[01, 01, 02, 07, 0d, 05, 09, 09, 01, 31, 01, 13, 0c, 05, 14, 09, 00, 0a, 01, 00, 0e, 00, 1b, 05, 00, 1f, 00, 27, 09, 01, 09, 00, 0a, 11, 00, 0e, 00, 1a, 09, 00, 1e, 00, 20, 0d, 01, 0e, 00, 10, 03, 02, 01, 00, 02]
Number of files: 1
- file 0 => global file 1
Number of expressions: 2
- expression 0 operands: lhs = Counter(1), rhs = Expression(1, Add)
- expression 1 operands: lhs = Counter(2), rhs = Counter(3)
- expression 0 operands: lhs = Expression(1, Add), rhs = Counter(3)
- expression 1 operands: lhs = Counter(1), rhs = Counter(2)
Number of file 0 mappings: 9
- Code(Counter(0)) at (prev + 49, 1) to (start + 19, 12)
- Code(Counter(1)) at (prev + 20, 9) to (start + 0, 10)
Expand All @@ -237,7 +237,7 @@ Number of file 0 mappings: 9
- Code(Counter(2)) at (prev + 0, 30) to (start + 0, 32)
- Code(Counter(3)) at (prev + 1, 14) to (start + 0, 16)
- Code(Expression(0, Add)) at (prev + 2, 1) to (start + 0, 2)
= (c1 + (c2 + c3))
= ((c1 + c2) + c3)

Function name: async::j::c
Raw bytes (28): 0x[01, 01, 02, 01, 05, 05, 02, 04, 01, 33, 05, 01, 12, 05, 02, 0d, 00, 0e, 02, 0a, 0d, 00, 0e, 07, 02, 05, 00, 06]
Expand Down Expand Up @@ -283,22 +283,22 @@ Number of file 0 mappings: 5
- Code(Zero) at (prev + 2, 1) to (start + 0, 2)

Function name: async::l
Raw bytes (37): 0x[01, 01, 04, 01, 07, 09, 05, 09, 0f, 05, 02, 05, 01, 53, 01, 01, 0c, 02, 02, 0e, 00, 10, 05, 01, 0e, 00, 10, 09, 01, 0e, 00, 10, 0b, 02, 01, 00, 02]
Raw bytes (37): 0x[01, 01, 04, 01, 07, 05, 09, 0f, 02, 09, 05, 05, 01, 53, 01, 01, 0c, 02, 02, 0e, 00, 10, 05, 01, 0e, 00, 10, 09, 01, 0e, 00, 10, 0b, 02, 01, 00, 02]
Number of files: 1
- file 0 => global file 1
Number of expressions: 4
- expression 0 operands: lhs = Counter(0), rhs = Expression(1, Add)
- expression 1 operands: lhs = Counter(2), rhs = Counter(1)
- expression 2 operands: lhs = Counter(2), rhs = Expression(3, Add)
- expression 3 operands: lhs = Counter(1), rhs = Expression(0, Sub)
- expression 1 operands: lhs = Counter(1), rhs = Counter(2)
- expression 2 operands: lhs = Expression(3, Add), rhs = Expression(0, Sub)
- expression 3 operands: lhs = Counter(2), rhs = Counter(1)
Number of file 0 mappings: 5
- Code(Counter(0)) at (prev + 83, 1) to (start + 1, 12)
- Code(Expression(0, Sub)) at (prev + 2, 14) to (start + 0, 16)
= (c0 - (c2 + c1))
= (c0 - (c1 + c2))
- Code(Counter(1)) at (prev + 1, 14) to (start + 0, 16)
- Code(Counter(2)) at (prev + 1, 14) to (start + 0, 16)
- Code(Expression(2, Add)) at (prev + 2, 1) to (start + 0, 2)
= (c2 + (c1 + (c0 - (c2 + c1))))
= ((c2 + c1) + (c0 - (c1 + c2)))

Function name: async::m
Raw bytes (9): 0x[01, 01, 00, 01, 01, 5b, 01, 00, 19]
Expand Down
10 changes: 5 additions & 5 deletions tests/coverage/conditions.cov-map
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Open in desktop
Original file line number Diff line number Diff line change
@@ -1,5 +1,5 @@
Function name: conditions::main
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Number of files: 1
- file 0 => global file 1
Number of expressions: 142
Expand Down Expand Up @@ -139,9 +139,9 @@ Number of expressions: 142
- expression 133 operands: lhs = Expression(134, Add), rhs = Counter(7)
- expression 134 operands: lhs = Counter(5), rhs = Counter(6)
- expression 135 operands: lhs = Expression(136, Add), rhs = Expression(139, Sub)
- expression 136 operands: lhs = Expression(137, Add), rhs = Expression(138, Add)
- expression 137 operands: lhs = Counter(9), rhs = Counter(10)
- expression 138 operands: lhs = Counter(11), rhs = Counter(12)
- expression 136 operands: lhs = Expression(137, Add), rhs = Counter(12)
- expression 137 operands: lhs = Expression(138, Add), rhs = Counter(11)
- expression 138 operands: lhs = Counter(9), rhs = Counter(10)
- expression 139 operands: lhs = Expression(140, Sub), rhs = Counter(3)
- expression 140 operands: lhs = Expression(141, Add), rhs = Counter(2)
- expression 141 operands: lhs = Counter(1), rhs = Zero
Expand Down Expand Up @@ -255,5 +255,5 @@ Number of file 0 mappings: 68
= (((c5 + c6) + c7) + c8)
- Code(Counter(9)) at (prev + 2, 9) to (start + 0, 15)
- Code(Expression(130, Add)) at (prev + 2, 1) to (start + 0, 2)
= ((c4 + (((c5 + c6) + c7) + c8)) + (((c9 + c10) + (c11 + c12)) + (((c1 + Zero) - c2) - c3)))
= ((c4 + (((c5 + c6) + c7) + c8)) + ((((c9 + c10) + c11) + c12) + (((c1 + Zero) - c2) - c3)))

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