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Fix performance regression from Compatible.qll #890

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Fix performance regression from Compatible.qll #890

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ed088be
Fix performance regression from Compatible.qll
MichaelRFairhurst Apr 25, 2025
472c93a
Add changes to join order and prevent cartesian product through rewrite
MichaelRFairhurst Apr 25, 2025
7f6b32d
Try new approach to reduce search set in type equivalence, some new j…
MichaelRFairhurst Apr 27, 2025
4825774
Add missing file changed
MichaelRFairhurst Apr 27, 2025
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Add changes to join order and prevent cartesian product through rewrite
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@MichaelRFairhurst
MichaelRFairhurst committed Apr 25, 2025
commit 472c93a89b47f0b7c8492c6ea12edd7fe70e616a
18 changes: 14 additions & 4 deletions cpp/common/src/codingstandards/cpp/types/Compatible.qll
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Original file line number Diff line number Diff line change
Expand Up @@ -53,8 +53,11 @@ module TypesCompatibleConfig implements TypeEquivalenceSig {
or
// Enum types are compatible with one of char, int, or signed int, but the implementation
// decides.
[t1, t2] instanceof Enum and
([t1, t2] instanceof CharType or [t1, t2] instanceof IntType)
t1 instanceof Enum and
(t2 instanceof CharType or t2 instanceof IntType)
or
t2 instanceof Enum and
(t1 instanceof CharType or t1 instanceof IntType)
}

bindingset[t1, t2]
Expand Down Expand Up @@ -348,8 +351,15 @@ module FunctionDeclarationTypeEquivalence<TypeEquivalenceSig Config> {
predicate equalParameterTypes(FunctionDeclarationEntry f1, FunctionDeclarationEntry f2) {
f1.getDeclaration() = f2.getDeclaration() and
forall(int i | exists([f1, f2].getParameterDeclarationEntry(i)) |
TypeEquivalence<Config, FunctionSignatureType>::equalTypes(f1.getParameterDeclarationEntry(i)
.getType(), f2.getParameterDeclarationEntry(i).getType())
equalParameterTypesAt(f1, f2, pragma[only_bind_into](i))
)
}

predicate equalParameterTypesAt(FunctionDeclarationEntry f1, FunctionDeclarationEntry f2, int i) {
pragma[only_bind_out](f1.getDeclaration()) = pragma[only_bind_out](f2.getDeclaration()) and
TypeEquivalence<Config, FunctionSignatureType>::equalTypes(
f1.getParameterDeclarationEntry(i).getType(),
f2.getParameterDeclarationEntry(i).getType()
)
}
}
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