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C#: Remove some FPs for cs/simplifiable-boolean-expression. #22708

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Merged
michaelnebel merged 7 commits into from
Oct 6, 2026
Merged

C#: Remove some FPs for cs/simplifiable-boolean-expression. #22708

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838e1f7
C#: Add some tests with incomplete type information.
michaelnebel Sep 30, 2026
964adaa
C#: Simplify to avoid binding sets.
michaelnebel Sep 30, 2026
fd116f2
C#: Re-factor the implementation to use the designated predicates for…
michaelnebel Sep 30, 2026
cbf1c4f
C#: Check that both operands are booleans when suggesting re-writes f…
michaelnebel Sep 30, 2026
9ab1f34
C#: Update test expected output.
michaelnebel Sep 30, 2026
9bf56c5
C#: Add change-note.
michaelnebel Sep 30, 2026
8ebc37c
C#: Address copilots review comments.
michaelnebel Sep 30, 2026
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C#: Simplify to avoid binding sets.
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@michaelnebel
michaelnebel committed Sep 30, 2026
commit 964adaa448f79e2ecd54768be95a40a44093eec8
24 changes: 11 additions & 13 deletions csharp/ql/src/Language Abuse/SimplifyBoolExpr.ql
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Original file line number Diff line number Diff line change
Expand Up @@ -37,16 +37,6 @@ predicate rewriteBinaryExpr(BinaryOperation op, boolean value, string oldPattern
literalChild(op, 1, value) and oldPattern = "A " + op.getOperator() + " " + value
}

bindingset[withFalseOperand, withTrueOperand]
predicate rewriteBinaryExpr(
BinaryOperation op, string oldPattern, string withFalseOperand, string withTrueOperand,
string newPattern
) {
rewriteBinaryExpr(op, false, oldPattern) and newPattern = withFalseOperand
or
rewriteBinaryExpr(op, true, oldPattern) and newPattern = withTrueOperand
}

predicate rewriteConditionalExpr(ConditionalExpr cond, string oldPattern, string newPattern) {
literalChild(cond, 1, false) and oldPattern = "A ? false : B" and newPattern = "!A && B"
or
Expand Down Expand Up @@ -115,12 +105,20 @@ predicate pushNegation(LogicalNotExpr expr, string oldPattern, string newPattern
)
}

predicate rewrite(Expr expr, string oldPattern, string newPattern) {
predicate rewriteBinaryOperation(BinaryOperation op, string oldPattern, string newPattern) {
exists(string withFalseOperand, string withTrueOperand |
simplifyBinaryExpr(expr.(BinaryOperation).getOperator(), withFalseOperand, withTrueOperand)
simplifyBinaryExpr(op.getOperator(), withFalseOperand, withTrueOperand)
|
rewriteBinaryExpr(expr, oldPattern, withFalseOperand, withTrueOperand, newPattern)
rewriteBinaryExpr(op, false, oldPattern) and
newPattern = withFalseOperand
or
rewriteBinaryExpr(op, true, oldPattern) and
newPattern = withTrueOperand
)
}

predicate rewrite(Expr expr, string oldPattern, string newPattern) {
rewriteBinaryOperation(expr, oldPattern, newPattern)
or
rewriteConditionalExpr(expr, oldPattern, newPattern)
or
Expand Down