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new method for Stmt nodes to report whether they could execute a "return"

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This commit is contained in:
Vern Paxson 2023-12-04 16:52:23 -08:00
parent 3d69b0551a
commit 087eb1ca4e
3 changed files with 40 additions and 1 deletions
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6
src/StmtBase.h
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@ -138,6 +138,12 @@ public:
// in that case, they do lead to flow reaching the end.
virtual bool NoFlowAfter(bool ignore_break) const { return false; }
// True if the statement could potentially execute a return. This is
// used by script optimization to track confluence inside catch-return
// blocks. Here, ignore_break is false if we're analyzing a coalesced
// hook body.
virtual bool CouldReturn(bool ignore_break) const { return false; }
// Access to the original statement from which this one is derived,
// or this one if we don't have an original. Returns a bare pointer
// rather than a StmtPtr to emphasize that the access is read-only.