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EssentialType: Implement correct essential types for bitwise binary operators &, ^ and |. #787

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EssentialType: Implement correct essential types for bitwise binary operators &, ^ and |. #787

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8f81b4e
EssentialTypes: Correct handling of bitwise binary expressions
lcartey Oct 27, 2024
a5ed461
EssentialTypes: Add test cases for shifts
lcartey Oct 27, 2024
aba9528
RULE-10-3: Expand test cases for binary bitwise operators
lcartey Oct 27, 2024
5b753e0
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lcartey Oct 28, 2024
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49 changes: 47 additions & 2 deletions c/misra/src/codingstandards/c/misra/EssentialTypes.qll
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Original file line number Diff line number Diff line change
Expand Up @@ -192,8 +192,8 @@ class EssentialEqualityOperationExpr extends EssentialExpr, EqualityOperation {
override Type getEssentialType() { result instanceof BoolType }
}

class EssentialBinaryBitwiseOperationExpr extends EssentialExpr, BinaryBitwiseOperation {
EssentialBinaryBitwiseOperationExpr() {
class EssentialShiftOperationExpr extends EssentialExpr, BinaryBitwiseOperation {
EssentialShiftOperationExpr() {
this instanceof LShiftExpr or
this instanceof RShiftExpr
}
Expand Down Expand Up @@ -353,6 +353,51 @@ class EssentialBinaryArithmeticExpr extends EssentialExpr, BinaryArithmeticOpera
}
}

class EssentialBinaryBitwiseExpr extends EssentialExpr, BinaryBitwiseOperation {
EssentialBinaryBitwiseExpr() {
not this instanceof LShiftExpr and
not this instanceof RShiftExpr
}

override Type getEssentialType() {
exists(
Type leftEssentialType, Type rightEssentialType,
EssentialTypeCategory leftEssentialTypeCategory,
EssentialTypeCategory rightEssentialTypeCategory
|
leftEssentialType = getEssentialType(getLeftOperand()) and
rightEssentialType = getEssentialType(getRightOperand()) and
leftEssentialTypeCategory = getEssentialTypeCategory(leftEssentialType) and
rightEssentialTypeCategory = getEssentialTypeCategory(rightEssentialType)
|
if
leftEssentialTypeCategory = EssentiallySignedType() and
rightEssentialTypeCategory = EssentiallySignedType()
then
if exists(getValue())
then result = stlr(this)
else (
if leftEssentialType.getSize() > rightEssentialType.getSize()
then result = leftEssentialType
else result = rightEssentialType
)
else
if
leftEssentialTypeCategory = EssentiallyUnsignedType() and
rightEssentialTypeCategory = EssentiallyUnsignedType()
then
if exists(getValue())
then result = utlr(this)
else (
if leftEssentialType.getSize() > rightEssentialType.getSize()
then result = leftEssentialType
else result = rightEssentialType
)
else result = this.getStandardType()
)
}
}

/**
* A named Enum type, as per D.5.
*/
Expand Down
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