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Java: Adopt shared SSA library #16900

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Java: Adopt shared SSA library #16900

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35 changes: 24 additions & 11 deletions java/ql/lib/semmle/code/java/dataflow/Nullness.qll
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Original file line number Diff line number Diff line change
Expand Up @@ -463,6 +463,21 @@ private predicate interestingCond(SsaSourceVariable npecand, ConditionBlock cond
not cond.getCondition().(Expr).getAChildExpr*() = npecand.getAnAccess()
}

pragma[nomagic]
private ConditionBlock ssaIntegerGuard(SsaVariable v, boolean branch, int k, boolean is_k) {
result.getCondition() = integerGuard(v.getAUse(), branch, k, is_k)
}

pragma[nomagic]
private ConditionBlock ssaIntBoundGuard(SsaVariable v, boolean branch_with_lower_bound_k, int k) {
result.getCondition() = intBoundGuard(v.getAUse(), branch_with_lower_bound_k, k)
}

pragma[nomagic]
private ConditionBlock ssaEnumConstEquality(SsaVariable v, boolean polarity, EnumConstant c) {
result.getCondition() = enumConstEquality(v.getAUse(), polarity, c)
}

/** A pair of correlated conditions for a given NPE candidate. */
private predicate correlatedConditions(
SsaSourceVariable npecand, ConditionBlock cond1, ConditionBlock cond2, boolean inverted
Expand All @@ -485,25 +500,23 @@ private predicate correlatedConditions(
inverted = branch1.booleanXor(branch2)
)
or
exists(SsaVariable v, VarRead rv1, VarRead rv2, int k, boolean branch1, boolean branch2 |
rv1 = v.getAUse() and
rv2 = v.getAUse() and
cond1.getCondition() = integerGuard(rv1, branch1, k, true) and
cond1.getCondition() = integerGuard(rv1, branch1.booleanNot(), k, false) and
cond2.getCondition() = integerGuard(rv2, branch2, k, true) and
cond2.getCondition() = integerGuard(rv2, branch2.booleanNot(), k, false) and
exists(SsaVariable v, int k, boolean branch1, boolean branch2 |
cond1 = ssaIntegerGuard(v, branch1, k, true) and
cond1 = ssaIntegerGuard(v, branch1.booleanNot(), k, false) and
cond2 = ssaIntegerGuard(v, branch2, k, true) and
cond2 = ssaIntegerGuard(v, branch2.booleanNot(), k, false) and
inverted = branch1.booleanXor(branch2)
)
or
exists(SsaVariable v, int k, boolean branch1, boolean branch2 |
cond1.getCondition() = intBoundGuard(v.getAUse(), branch1, k) and
cond2.getCondition() = intBoundGuard(v.getAUse(), branch2, k) and
cond1 = ssaIntBoundGuard(v, branch1, k) and
cond2 = ssaIntBoundGuard(v, branch2, k) and
inverted = branch1.booleanXor(branch2)
)
or
exists(SsaVariable v, EnumConstant c, boolean pol1, boolean pol2 |
cond1.getCondition() = enumConstEquality(v.getAUse(), pol1, c) and
cond2.getCondition() = enumConstEquality(v.getAUse(), pol2, c) and
cond1 = ssaEnumConstEquality(v, pol1, c) and
cond2 = ssaEnumConstEquality(v, pol2, c) and
inverted = pol1.booleanXor(pol2)
)
or
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