CAD-4750 generalise OrElse frame #15
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yogeshsajanikar
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coot
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Very nice, thanks! I'd only would make BranchStmA a strict field (as suggested by @nfrisby): since we are providing another level of abstraction / indirection, making this field strict will eliminate the thunk before IOSim would evaluate it.
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resolves IntersectMBO/ouroboros-network#1461 |
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OrElseLeftFrame and OrElseRightFrame represent a control structure that has a alternative branch that is executed when `retry` is applied. A `catch` has a similar execution model when a `throw` is applied. The control frame is generalised to BranchFrame that can hold an alternative statement. If the execution context is `left` side of the branch then the BranchFrame contains `right` statement. When we are executing in the `right` context, the branch frame contains an empty statement.
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OrElse and Catch have similar control semantics. Both have alternate branches that needs to be considered when a certain condition is encountered (retry in OrElse, throw in Catch). This commit tries to generalise OrElseLeftFrame/OrElseRightFrame to handle these control semantics in a similar fashion.
The commit introduces
BranchFramethat indicates that a branch has an alternate execution that is indicated by either a "statement" (OrElseStmA) or an empty statement (to indicate that there is no alternate execution left, this replaces OrElseRightFrame).This should allow adding
Catchto IO-Sim a relatively easily, than introducing a new frame to handle Catch separately.