Additional forward propagation to aid code contracts #7737
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tautschnig
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May 29, 2023
tautschnig
commented
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Rather than adding more-and-more expressions to the enumeration just call out those that are _not_ constant ((nondet) symbols and side-effect expressions as well as any access that may be out of bounds).
We would only deem with_exprt constant when all their operands are constant, which means that the array operand must be an array or array_of expression, and both update indices as well as update values must be constant. In most such cases the simplifier would rewrite the with_exprt anyway. The exception to this is an index that cannot immediately be evaluated to a numeric constant, as is the case with, e.g., pointer_object expressions. Fixes: diffblue#3095
We do not prescribe a fixed type for these expressions, so we can just alter the type and have back-ends deal with producing a suitable value of the new type. Co-authored-by: Remi Delmas <delmasrd@amazon.com>
Needs some heuristics to constrain `record_may_leak`, which can produce deeply nested expressions. Co-authored-by: Remi Delmas <delmasrd@amazon.com>
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