Add forward ecall with framed preconditions#937
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This extends ecall to support forward calls on Hoare goals via ->>, while keeping backward behavior for existing uses. It refactors call postcondition generation into reusable helpers, adds proof-term/program-variable substitution utilities needed to instantiate contracts cleanly, and checks that the supplied contract matches the targeted procedure(s). For forward Hoare calls, the tactic now automatically frames precondition conjuncts that are independent of the call’s writes. A regression test is added in tests/forward-call.ec.
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Gustavo2622
reviewed
Apr 8, 2026
Add comments detailing the inference rules implemented by t_ecall_hoare_fwd and t_ecall_hoare_bwd in ecPhlExists.ml.
Gustavo2622
approved these changes
Apr 9, 2026
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This extends ecall to support forward calls on Hoare goals via ->>, while keeping backward behavior for existing uses.
It refactors call postcondition generation into reusable helpers, adds proof-term/program-variable substitution utilities needed to instantiate contracts cleanly, and checks that the supplied contract matches the targeted procedure(s). For forward Hoare calls, the tactic now automatically frames precondition conjuncts that are independent of the call’s writes.
A regression test is added in tests/forward-call.ec.