By Wirth N.
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Extra resources for A basic course on compiler principles
A catch is similar to an else in providing an alternative way of achieving the same goal. The difference is that the first operand does not necessarily restore its initial state, and that the second operand is triggered by a throw exit instead of a fail exit from the first operand. A throw is appropriate when the first operand has been unable either to restore the initial state or to finish successfully. The catching clause is intended to behave like the first operand should have done: either to complete the compensation and fail, or to succeed in the normal way, or else to throw again to some yet more distant catch.
The account is also quite formal, in the sense that the nets for any transaction composed solely by the principles described can actually be drawn, programmed and executed by computer. The assertions on the arrows give guidance on how to design correctness into a system of transactions from the earliest stage. The correctness principle for places and transitions serves as an axiomatic semantics, and shows how to prove the correctness of a complete flowchart in a modular way, by 40 T. Hoare proving the correctness of each component and each connecting arrow separately.
This means that the local assertions of each thread must also be an invariant of every atomic region that may be invoked by the other threads. A direct application of this proof rule would require proof of each thread to know all the internal assertions in every other thread -- a serious violation of the principal of locality of proof. A stronger but more modular condition is that each thread must prove locally that all its assertions are invariant of any section of code X that leaves R invariant.