Ruby: Include empty StmtSequences in CFG #7324
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Empty StmtSequences appear, for example, in the `else` branch of `if`
statements like the following:
foo
if cond
bar
else
end
baz
Before this change, the CFG for this code would look like this:
foo
│
│
▼
cond
│
true │
▼
bar
│
│
▼
if
│
│
▼
baz
i.e. there is linear flow through the condition, the `then` branch, and
out of the if. This doesn't account for the possibility that the
condition is false and `bar` is not executed. After this change, the CFG
looks like this:
foo
│
│
▼
cond
│ │
true │ │ false
▼ │
bar │
│ │
│ │
▼ ▼
if
│
│
▼
baz
i.e. we correctly account for the `false` condition.
hvitved
approved these changes
Dec 7, 2021
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Empty StmtSequences appear, for example, in the
elsebranch ofifstatements like the following:
Before this change, the CFG for this code would look like this:
i.e. there is linear flow through the condition, the
thenbranch, andout of the if. This doesn't account for the possibility that the
condition is false and
baris not executed. After this change, the CFGlooks like this:
i.e. we correctly account for the
falsecondition.