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Support event data type (with some restrictions).

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This commit is contained in:
Wilson Snyder
2020-04-25 15:37:46 -04:00
parent 9991b19610
commit 87e1c36e4a
12 changed files with 344 additions and 11 deletions
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src/V3Delayed.cpp
+14 -3
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@@ -385,6 +385,8 @@ private:
nodep->v3warn(BLKLOOPINIT, "Unsupported: Delayed assignment to array inside for "
"loops (non-delayed is ok - see docs)");
}
AstBasicDType* basicp = lhsp->dtypep()->basicp();
if (basicp && basicp->isEventValue()) nodep->v3error("Unsupported: event arrays");
if (newlhsp) {
nodep->lhsp(newlhsp);
} else {
@@ -418,9 +420,18 @@ private:
if (!dlyvscp) { // First use of this delayed variable
string newvarname = (string("__Vdly__") + nodep->varp()->shortName());
dlyvscp = createVarSc(oldvscp, newvarname, 0, NULL);
AstNodeAssign* prep = new AstAssignPre(
nodep->fileline(), new AstVarRef(nodep->fileline(), dlyvscp, true),
new AstVarRef(nodep->fileline(), oldvscp, false));
AstNodeAssign* prep;
AstBasicDType* basicp = oldvscp->dtypep()->basicp();
if (basicp && basicp->isEventValue()) {
// Events go to zero on next timestep unless reactivated
prep = new AstAssignPre(
nodep->fileline(), new AstVarRef(nodep->fileline(), dlyvscp, true),
new AstConst(nodep->fileline(), AstConst::LogicFalse()));
} else {
prep = new AstAssignPre(nodep->fileline(),
new AstVarRef(nodep->fileline(), dlyvscp, true),
new AstVarRef(nodep->fileline(), oldvscp, false));
}
AstNodeAssign* postp = new AstAssignPost(
nodep->fileline(), new AstVarRef(nodep->fileline(), oldvscp, true),
new AstVarRef(nodep->fileline(), dlyvscp, false));