coverage: Optionally instrument the RHS of lazy logical operators #125756
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When a lazy logical operator (`&&` or `||`) occurs outside of an `if` condition, it normally doesn't have any associated control-flow branch, so we don't have an existing way to track whether it was true or false. This patch adds special code to handle this case, by inserting extra MIR blocks in a diamond shape after evaluating the RHS. This gives us a place to insert the appropriate marker statements, which can then be given their own counters.
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coverage: Optionally instrument the RHS of lazy logical operators (This is an updated version of rust-lang#124644 and rust-lang#124402. Fixes rust-lang#124120.) When `||` or `&&` is used outside of a branching context (such as the condition of an `if`), the rightmost value does not directly influence any branching decision, so branch coverage instrumentation does not treat it as its own true-or-false branch. That is a correct and useful interpretation of “branch coverage”, but might be undesirable in some contexts, as described at rust-lang#124120. This PR therefore adds a new coverage level `-Zcoverage-options=condition` that behaves like branch coverage, but also adds additional branch instrumentation to the right-hand-side of lazy boolean operators. --- As discussed at rust-lang#124120 (comment), this is mainly intended as an intermediate step towards fully-featured MC/DC instrumentation. It's likely that we'll eventually want to remove this coverage level (rather than stabilize it), either because it has been incorporated into MC/DC instrumentation, or because it's getting in the way of future MC/DC work. The main appeal of landing it now is so that work on tracking conditions can proceed concurrently with other MC/DC-related work. `@rustbot` label +A-code-coverage
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coverage: Optionally instrument the RHS of lazy logical operators (This is an updated version of rust-lang#124644 and rust-lang#124402. Fixes rust-lang#124120.) When `||` or `&&` is used outside of a branching context (such as the condition of an `if`), the rightmost value does not directly influence any branching decision, so branch coverage instrumentation does not treat it as its own true-or-false branch. That is a correct and useful interpretation of “branch coverage”, but might be undesirable in some contexts, as described at rust-lang#124120. This PR therefore adds a new coverage level `-Zcoverage-options=condition` that behaves like branch coverage, but also adds additional branch instrumentation to the right-hand-side of lazy boolean operators. --- As discussed at rust-lang#124120 (comment), this is mainly intended as an intermediate step towards fully-featured MC/DC instrumentation. It's likely that we'll eventually want to remove this coverage level (rather than stabilize it), either because it has been incorporated into MC/DC instrumentation, or because it's getting in the way of future MC/DC work. The main appeal of landing it now is so that work on tracking conditions can proceed concurrently with other MC/DC-related work. ``@rustbot`` label +A-code-coverage
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Rollup of 6 pull requests Successful merges: - rust-lang#125652 (Revert propagation of drop-live information from Polonius) - rust-lang#125730 (Apply `x clippy --fix` and `x fmt` on Rustc) - rust-lang#125752 (run-make: enforce `#[must_use]` and arm command wrappers with drop bombs) - rust-lang#125756 (coverage: Optionally instrument the RHS of lazy logical operators) - rust-lang#125796 (Also InstSimplify `&raw*`) - rust-lang#125816 (Don't build the `rust-demangler` binary for coverage tests) r? `@ghost` `@rustbot` modify labels: rollup
jieyouxu
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coverage: Optionally instrument the RHS of lazy logical operators (This is an updated version of rust-lang#124644 and rust-lang#124402. Fixes rust-lang#124120.) When `||` or `&&` is used outside of a branching context (such as the condition of an `if`), the rightmost value does not directly influence any branching decision, so branch coverage instrumentation does not treat it as its own true-or-false branch. That is a correct and useful interpretation of “branch coverage”, but might be undesirable in some contexts, as described at rust-lang#124120. This PR therefore adds a new coverage level `-Zcoverage-options=condition` that behaves like branch coverage, but also adds additional branch instrumentation to the right-hand-side of lazy boolean operators. --- As discussed at rust-lang#124120 (comment), this is mainly intended as an intermediate step towards fully-featured MC/DC instrumentation. It's likely that we'll eventually want to remove this coverage level (rather than stabilize it), either because it has been incorporated into MC/DC instrumentation, or because it's getting in the way of future MC/DC work. The main appeal of landing it now is so that work on tracking conditions can proceed concurrently with other MC/DC-related work. ```@rustbot``` label +A-code-coverage
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…iaskrgr Rollup of 7 pull requests Successful merges: - rust-lang#125652 (Revert propagation of drop-live information from Polonius) - rust-lang#125730 (Apply `x clippy --fix` and `x fmt` on Rustc) - rust-lang#125756 (coverage: Optionally instrument the RHS of lazy logical operators) - rust-lang#125776 (Stop using `translate_args` in the new solver) - rust-lang#125796 (Also InstSimplify `&raw*`) - rust-lang#125807 (Also resolve the type of constants, even if we already turned it into an error constant) - rust-lang#125816 (Don't build the `rust-demangler` binary for coverage tests) r? `@ghost` `@rustbot` modify labels: rollup
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Rollup merge of rust-lang#125756 - Zalathar:branch-on-bool, r=oli-obk coverage: Optionally instrument the RHS of lazy logical operators (This is an updated version of rust-lang#124644 and rust-lang#124402. Fixes rust-lang#124120.) When `||` or `&&` is used outside of a branching context (such as the condition of an `if`), the rightmost value does not directly influence any branching decision, so branch coverage instrumentation does not treat it as its own true-or-false branch. That is a correct and useful interpretation of “branch coverage”, but might be undesirable in some contexts, as described at rust-lang#124120. This PR therefore adds a new coverage level `-Zcoverage-options=condition` that behaves like branch coverage, but also adds additional branch instrumentation to the right-hand-side of lazy boolean operators. --- As discussed at rust-lang#124120 (comment), this is mainly intended as an intermediate step towards fully-featured MC/DC instrumentation. It's likely that we'll eventually want to remove this coverage level (rather than stabilize it), either because it has been incorporated into MC/DC instrumentation, or because it's getting in the way of future MC/DC work. The main appeal of landing it now is so that work on tracking conditions can proceed concurrently with other MC/DC-related work. ````@rustbot```` label +A-code-coverage
fmease
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Jun 19, 2024
…l, r=nnethercote MCDC Coverage: instrument last boolean RHS operands from condition coverage Fresh PR from rust-lang#124652 -- This PR ensures that the top-level boolean expressions that are not part of the control flow are correctly instrumented thanks to condition coverage. See discussion on rust-lang#124120. Depends on `@Zalathar` 's condition coverage implementation rust-lang#125756.
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Rollup merge of rust-lang#125766 - RenjiSann:fresh-mcdc-branch-on-bool, r=nnethercote MCDC Coverage: instrument last boolean RHS operands from condition coverage Fresh PR from rust-lang#124652 -- This PR ensures that the top-level boolean expressions that are not part of the control flow are correctly instrumented thanks to condition coverage. See discussion on rust-lang#124120. Depends on `@Zalathar` 's condition coverage implementation rust-lang#125756.
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(This is an updated version of #124644 and #124402. Fixes #124120.)
When
||or&&is used outside of a branching context (such as the condition of anif), the rightmost value does not directly influence any branching decision, so branch coverage instrumentation does not treat it as its own true-or-false branch.That is a correct and useful interpretation of “branch coverage”, but might be undesirable in some contexts, as described at #124120. This PR therefore adds a new coverage level
-Zcoverage-options=conditionthat behaves like branch coverage, but also adds additional branch instrumentation to the right-hand-side of lazy boolean operators.As discussed at #124120 (comment), this is mainly intended as an intermediate step towards fully-featured MC/DC instrumentation. It's likely that we'll eventually want to remove this coverage level (rather than stabilize it), either because it has been incorporated into MC/DC instrumentation, or because it's getting in the way of future MC/DC work. The main appeal of landing it now is so that work on tracking conditions can proceed concurrently with other MC/DC-related work.
@rustbot label +A-code-coverage