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coverage: Instrument the RHS value of lazy logical operators

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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.
This commit is contained in:
Zalathar 2024-05-01 17:33:33 +10:00
parent 20174e6638
commit 35a8746832
4 changed files with 162 additions and 61 deletions
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5
tests/coverage/condition/conditions.coverage
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@ -15,6 +15,7 @@
^2
------------------
| Branch (LL:13): [True: 2, False: 1]
| Branch (LL:18): [True: 1, False: 1]
------------------
LL| 3| black_box(x);
LL| 3|}
@ -24,6 +25,7 @@
^1
------------------
| Branch (LL:13): [True: 2, False: 1]
| Branch (LL:18): [True: 0, False: 1]
------------------
LL| 3| black_box(x);
LL| 3|}
@ -34,6 +36,7 @@
------------------
| Branch (LL:13): [True: 2, False: 2]
| Branch (LL:18): [True: 1, False: 1]
| Branch (LL:23): [True: 1, False: 0]
------------------
LL| 4| black_box(x);
LL| 4|}
@ -44,6 +47,7 @@
------------------
| Branch (LL:13): [True: 2, False: 2]
| Branch (LL:18): [True: 1, False: 1]
| Branch (LL:23): [True: 2, False: 1]
------------------
LL| 4| black_box(x);
LL| 4|}
@ -57,6 +61,7 @@
^2
------------------
| Branch (LL:9): [True: 2, False: 1]
| Branch (LL:14): [True: 1, False: 1]
------------------
LL| 3|}
LL| |