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Support followed-by operators #-# and #=# in properties (#7523)

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This commit is contained in:
Yilou Wang
2026-05-04 08:10:37 -04:00
committed by GitHub
parent ddcb04b921
commit bc1acc8aa3
14 changed files with 295 additions and 50 deletions
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src/V3AssertPre.cpp
+12
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@@ -1002,6 +1002,18 @@ private:
void visit(AstImplication* nodep) override {
if (nodep->sentreep()) return; // Already processed
// Top-level followed-by is claimed by V3AssertNfa; anything reaching here
// is nested inside iff/implies/or. IEEE 1800-2023 16.12.9 permits the
// composition, but silent lowering would drop non-vacuous-fail semantics.
if (nodep->isFollowedBy()) {
nodep->v3warn(E_UNSUPPORTED,
"Unsupported: followed-by (#-# / #=#) nested inside property operator"
" (iff/implies/or) (IEEE 1800-2023 16.12.9)");
nodep->replaceWith(new AstConst{nodep->fileline(), AstConst::BitFalse{}});
VL_DO_DANGLING(pushDeletep(nodep), nodep);
return;
}
// Handle goto repetition as antecedent before iterateChildren,
// so the standalone AstSGotoRep visitor doesn't process it
if (AstSGotoRep* const gotop = VN_CAST(nodep->lhsp(), SGotoRep)) {