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Support inout clocking items (#5160)

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This commit is contained in:
Arkadiusz Kozdra
2024-06-07 08:30:58 -04:00
committed by GitHub
parent 3f886f7c61
commit 1dbf1be3e6
9 changed files with 116 additions and 23 deletions
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src/V3AssertPre.cpp
+11 -3
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@@ -158,6 +158,13 @@ private:
iterateChildren(nodep);
}
void visit(AstClockingItem* const nodep) override {
// Get a ref to the sampled/driven variable
AstVar* const varp = nodep->varp();
if (!varp) {
// Unused item
pushDeletep(nodep->unlinkFrBack());
return;
}
FileLine* const flp = nodep->fileline();
V3Const::constifyEdit(nodep->skewp());
if (!VN_IS(nodep->skewp(), Const)) {
@@ -168,9 +175,7 @@ private:
AstConst* const skewp = VN_AS(nodep->skewp(), Const);
if (skewp->num().isNegative()) skewp->v3error("Skew cannot be negative");
AstNodeExpr* const exprp = nodep->exprp();
// Get a ref to the sampled/driven variable
AstVar* const varp = nodep->varp()->unlinkFrBack();
m_clockingp->addVarsp(varp);
m_clockingp->addVarsp(varp->unlinkFrBack());
varp->user1p(nodep);
if (nodep->direction() == VDirection::OUTPUT) {
AstVarRef* const skewedRefp = new AstVarRef{flp, varp, VAccess::READ};
@@ -224,6 +229,7 @@ private:
AstVar* const queueVarp = new AstVar{
flp, VVarType::MODULETEMP,
"__Vqueue__" + m_clockingp->name() + "__DOT__" + varp->name(), queueDtp};
queueVarp->lifetime(VLifetime::STATIC);
m_clockingp->addNextHere(queueVarp);
// Create a process like this:
// always queue.push(<sampled var>);
@@ -290,6 +296,8 @@ private:
const std::string delayName = m_cycleDlyNames.get(nodep);
AstVar* const cntVarp = new AstVar{flp, VVarType::BLOCKTEMP, delayName + "__counter",
nodep->findBasicDType(VBasicDTypeKwd::UINT32)};
cntVarp->lifetime(VLifetime::AUTOMATIC);
cntVarp->funcLocal(true);
AstBegin* const beginp = new AstBegin{flp, delayName + "__block", cntVarp, false, true};
beginp->addStmtsp(new AstAssign{flp, new AstVarRef{flp, cntVarp, VAccess::WRITE}, valuep});
beginp->addStmtsp(new AstWhile{